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060 - Power plants

060325000 - PRESSURE FLUID SOURCE AND MOTOR

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DocumentTitleDate
20130025271Method and arrangement for active make-up in an overrunning actuator - A hydraulic system having an actuator having a piston and associated rod forming head and rod chambers and being adapted to move between retracted and extended positions within a cylinder, and first and second sources of fluid. A first pump provides fluid from the first source to the head chamber at a first pressure. At least one valve provides fluid from the second source at a second pressure to supplement fluid provided to the head chamber from the first pump when the second pressure is greater than the first pressure.01-31-2013
20130042601High Output Modular CAES (HOMC) - A compressed air energy storage system integrated with a source of secondary heat, such as a simple cycle gas turbine, to increase power production and to provide power regulation through the use of stored compressed air heated by said secondary heat to provide power augmentation.02-21-2013
20130042602Power Train For a Hybrid Vehicle - The invention relates to a power train for a hybrid vehicle, comprising two hydraulic machines (02-21-2013
20090193800SERVICE PACK TANDEM PUMP - In certain embodiments, a service pack includes an engine, a tandem pump system coupled to the engine, and a controller. The tandem pump system may include a first pump and a second pump in tandem with one another. The controller may be configured to enable the first pump at a first load condition associated with the engine, the second pump at a second load condition associated with the engine, and both the first and second pumps at a third load condition associated with the engine. The load conditions may correspond to engine loads, hydraulic loads, or other loads associated with the engine. For example, at a low hydraulic pressure, the controller may selectively operate both the first and second pumps, whereas the controller may selectively operate only the first pump or the second pump at high and medium hydraulic pressures, respectively. In this manner, the system can provide suitable flow without overloading the engine.08-06-2009
20100115936SYSTEM AND METHOD FOR PUMP-CONTROLLED CYLINDER CUSHIONING - A system and method for controlling the movement of an implement of an earthmoving machine. The system includes a hydraulic actuator adapted to move the implement. A variable displacement pump is coupled to the actuator for delivering a pressurized fluid to and receiving pressurized fluid from chambers within the actuator. A sensor generates an output based on the position of the actuator's piston or piston rod, and a controller controls the displacement of the variable displacement pump in response to the output of the sensor by executing an algorithm to reduce the flow rate of the fluid to and from the actuator's chambers and thereby reduce the velocity of the piston as it approaches an end of a piston stroke thereof and prevent the piston from impacting the actuator at the end of the piston stroke.05-13-2010
20130074485SYSTEMS AND METHODS FOR FOAM-BASED HEAT EXCHANGE DURING ENERGY STORAGE AND RECOVERY USING COMPRESSED GAS - In various embodiments, foam is compressed to store energy and/or expanded to recover energy.03-28-2013
20130074484FOOTWEAR HAVING AIR-CONTROLLED ACTIVE ELEMENT - A clothing article for a foot including a sole including a sealed collapsible air cavity having disposed therein a return support for expanding a collapsed air cavity wherein the air cavity includes an outlet permitting a quantity of air to exit when the air cavity is collapsed; an upper, coupled to the sole, for covering a portion of the foot; an air-actuated active element coupled to the upper, the active element including a first mode and a second mode, the active element biased to the first mode and responsive to the quantity of air to transition from the first mode to the second mode; and a communication channel, coupled to the outlet and to the active element, for transferring the quantity of air from the air cavity to the active element.03-28-2013
20130081384METERLESS HYDRAULIC SYSTEM HAVING PUMP PROTECTION - A hydraulic system is disclosed. The hydraulic system may have an over-center, variable-displacement pump, an actuator, and first and second passages that create a closed-loop circuit. The hydraulic system may also have first and second check valves disposed in the first and second passages, respectively, to allow flow only from the pump to the actuator. The hydraulic system may further have a first bypass line connecting the first passage at a location between the actuator and the first check valve to the first passage at a location between the first check valve and the pump, and a second bypass line connecting the second passage at a location between the actuator and the second check valve to the second passage at a location between the second check valve and the pump. The hydraulic system may additionally have a valve configured to control flow through the first and second bypass lines.04-04-2013
20130081386SYSTEM AND METHOD FOR CONTROLLING CHARGING OF AN ACCUMULATOR IN AN ELECTRO-HYDRAULIC SYSTEM - A novel energy saving mode of charging an accumulator in an electro-hydraulic system is disclosed involving toggling the position of a fan isolation valve from the flow-passing position, where the flow is driving a fan motor thereby maintaining a fan in an on position, to the flow-blocking position where the flow is inhibited from driving the fan motor thereby causing the fan to turn off, when the time to charge an accumulator is less than the period of time that the fan may be off and still allow for the cooling requirements of the engine to be satisfied. By diverting fluid flow from driving the fan motor to charging the accumulator, the disclosed energy saving mode allows for a greater flow of fluid to be delivered to the accumulator for charging, making it possible to charge the accumulators quicker and more efficiently while maintaining the cooling requirements of the engine. The energy saving mode of operation may illustratively be used in a hystat fan and hybrid system.04-04-2013
20130081385METERLESS HYDRAULIC SYSTEM HAVING MULTI-ACTUATOR CIRCUIT - A hydraulic system is disclosed. The hydraulic system may have a pump, a rotary actuator, a linear actuator, and a closed-loop circuit fluidly connecting the pump to the rotary and linear actuators. The hydraulic system may also have at least one valve configured to switch fluid flow direction from the pump through the linear actuator during fluid flow in a single direction through the rotary actuator.04-04-2013
20130081382REGENERATION CONFIGURATION FOR CLOSED-LOOP HYDRAULIC SYSTEMS - A hydraulic system is disclosed. The hydraulic system may have a pump, and a hydraulic actuator having a first chamber and a second chamber. The hydraulic system may also have a first pump passage fluidly communicating the pump with the first chamber, a second pump passage connected to the pump, and a regeneration valve. The regeneration valve may be movable from a first position at which the second pump passage is connected to the second chamber and the second chamber is isolated from the first chamber, to a second position at which the second pump passage is blocked and the second chamber is connected to the first chamber.04-04-2013
20130081383CLOSED-LOOP HYDRAULIC SYSTEM HAVING ENERGY RECOVERY - A hydraulic system is disclosed. The hydraulic system may have a pump with variable-displacement, a first linear actuator, and a second linear actuator coupled to the first linear actuator to operate in tandem. The first and second linear actuators may be connected to the pump in closed-loop manner, and each of the first and second linear actuators may have a first chamber and a second chamber separated by a piston. The hydraulic system may also have an accumulator in fluid communication with the second chamber of only the second linear actuator.04-04-2013
20120174569COMPENSATED COMPRESSED GAS STORAGE SYSTEMS - Systems, devices and methods for the compression, expansion, and/or storage of a gas are described herein. An apparatus suitable for use in a compressed gas-based energy storage and recovery system includes a pneumatic cylinder having a working piston disposed therein for reciprocating movement in the pneumatic cylinder, a hydraulic actuator coupled to the working piston, and a hydraulic controller fluidically coupleable to the hydraulic actuator. The apparatus is fluidically coupleable to a compressed gas storage chamber which includes a first storage chamber fluidically coupleable to the pneumatic chamber, and a second storage chamber is fluidically coupleable to the first storage chamber. The first storage chamber is disposed at a first elevation and is configured to contain a liquid and a gas. The second storage chamber is disposed at a second elevation greater than the first elevation, and is configured to contain a volume of liquid.07-12-2012
20100043418HYDRAULIC SYSTEM AND METHOD FOR CONTROL - A hydraulic system is disclosed having at least two hydraulic circuits. The disclosed system compares pressures between the hydraulic circuits and alters valve commands of the circuit associated with higher pressures in order to reduce overall system pressure.02-25-2010
20100043417METHOD FOR DETERMINING A SETTING PARAMETER FOR A HYDROSTATIC DISPLACEMENT UNIT AND A CORRESPONDING SYSTEM - A method and a system for determining a setting parameter of a hydrostatic displacement unit is provided. In the method, a pressure value, a rotational speed value, and a torque value are determined. The setting parameter can be determined with use of the pressure value, rotational speed value, torque value of the setting parameter characteristic diagram, and a setting parameter characteristic diagram, which is an inverted efficiency characteristic diagram, which has at least pressure, rotational speed, and torque as input parameters. The system can include a system unit for determining a pressure value, a system unit for determining a rotational speed value, a system unit for determining a torque value, and a system unit for determining the setting parameter with use of the pressure value, rotational speed value, torque value, and a characteristic diagram, whereby the system for determining a setting parameter is formed so that during the determination of the setting parameter it can use as a characteristic diagram a setting parameter characteristic diagram, which is an inverted efficiency characteristic diagram or torque characteristic diagram, which has at least pressure, rotational speed, and torque as input parameters.02-25-2010
20130036728PUMP SUCTION CHARGING SYSTEM - Disclosed are hydraulic pump systems and pump suction charging systems which reduce or eliminate cavitation in the systems, as well as methods of operating the same and work machines including the same.02-14-2013
20130036727DEVICE HAVING A HYDRAULIC DRIVE FOR CIVIL ENGINEERING - A device having a hydraulic drive for civil engineering work has least one shaft that can be rotated by a hydraulic motor. The hydraulic motor is operated by fluid of a hydraulic circuit that is supplied by a hydraulic pump. The hydraulic motor has a changeable displacement, and means for changing the volume stream are provided. A sensor for measuring the fluid pressure is disposed in the hydraulic circuit, and is connected with a control and regulation unit, by way of which the displacement of the hydraulic motor is adjustable, and by way of which the means for a change in the volume stream can be turned on. The control and regulation unit is set up so that in the event of a pressure drop in the hydraulic circuit, a reduction in the displacement of the hydraulic motor as well as a reduction in the volume stream is brought about.02-14-2013
20100107623HYDRAULIC SYSTEM HAVING AN EXTERNAL PRESSURE COMPENSATOR - A hydraulic system for a machine is disclosed. The hydraulic system has a source of pressurized fluid and a fluid actuator with a first chamber. The hydraulic system also has a first valve configured to selectively fluidly communicate the source with the first chamber. The first valve further includes a first element movable between a flow passing, at which fluid from the source flows to the first chamber, and a flow blocking position, at which fluid from the source is blocked from the first chamber and a second element configured to selectively drain a control passageway associated with the first element to cause the first element to move. The hydraulic system further has a proportional pressure compensating valve configured to control a pressure of a fluid directed between the source and the first valve dependent upon the pressure of the control passageway.05-06-2010
20100107622SYSTEM AND METHOD FOR PILOT-OPERATED HIGH PRESSURE VALVE - A system and method for operating a two-stage, high-pressure pumping system includes a low-pressure pump having an output configured to deliver a hydraulic fluid under a low-pressure at a high-volume to drive a tool associated with the two-stage, high-pressure, pumping system under low load conditions. The system also includes a high-pressure pump having an output configured to deliver the hydraulic fluid under a high-pressure at a low-volume to drive the tool under high load conditions. A pilot-operated device is included that is configured to selectively drive the tool with pressure from at least one of the output of the low-pressure pump and the output of the high-pressure pump. The pilot-operated device receives pilot pressure from the output of the low-pressure pump to control selectively driving the tool with the output of the two stage pump.05-06-2010
20100107621POWER CONVERSION - A wind energy converter 05-06-2010
20100107620Rotary flow control valve with energy recovery - A hydraulic circuit is provided having a hydraulic actuator and a flow control valve. The flow control valve has a pressure adjusting element fluidly coupled to the hydraulic actuator and situated to affect a pressure of fluid being directed to the hydraulic actuator. The flow control valve also has an energy directing element operatively coupled to the pressure adjusting element and situated to be driven by the pressure adjusting element when the pressure adjusting element is selectively throttling fluid being directed to the hydraulic actuator.05-06-2010
20100005794DRIVE SYSTEM AND ACTUATION METHOD - The present invention relates to a drive system (01-14-2010
20130086895Pneumatic Starter Device for Internal Combustion Engines and Method of Operation - A pneumatic starter device for an internal combustion engine includes a cylinder-piston assembly, which can be operated either as a compressor or as a starter motor and which is drive-connected to the internal combustion engine. A pressure accumulator and a valve arrangement are associated with this assembly. The valve arrangement, which is between the assembly and the pressure accumulator, can be activated by a control unit and can be switched between a compressor mode and a starter mode. Before the cylinder-piston assembly is started up, it is set to a crank angle position in a range of positions that produce maximum output torque.04-11-2013
20100132351INTEGRATED ENGINE WELDER AND HYDRAULIC PUMP - An integrated welder, generator and hydraulic unit that includes a housing that at least partially contains components of a welder, generator and a hydraulic pump. An engine, an electric current generator, and a hydraulic pump are at least partially mounted in the housing. The electric current generator is at least partially connected to the engine to be at least partially driven thereby. The hydraulic pump can be at least partially powered by the electric current generator or the fuel powered engine during the operation of the engine. The integrated welder, generator and hydraulic unit can also include an air compressor.06-03-2010
20090308062Hydraulic Steering System and Method - A hydraulic steering system has a steering linkage and an actuator actuating the steering linkage. Pressurized hydraulic fluid can be fed to the actuator and removed from the actuator through a return pipe. A device installed into the return pipe counteracts volume flow pulsations by damming up the hydraulic fluid return flow. The device dams up the hydraulic fluid only in the event of an occurrence of a volume flow pulsation.12-17-2009
20120216519HYDRAULIC CONTROL SYSTEM HAVING CYLINDER FLOW CORRECTION - A hydraulic control system is disclosed. The hydraulic control system may have a hydraulic actuator, a valve arrangement, and an operator input device configured to generate a first signal indicative of a desired hydraulic actuator velocity. The hydraulic control system may also have a sensor configured to generate a second signal indicative of an actual flow rate of fluid entering the hydraulic actuator, and a controller. The controller may be configured to determine a desired flow rate of fluid into the hydraulic actuator based on the first signal; to estimate the actual flow rate based on the desired flow rate, a correction flow rate, and a system response model; and to determine the actual flow rate based on the second signal. The controller may also be configured to make a comparison of the estimated and determined actual flow rates of fluid, and to determine the correction flow rate based on the comparison.08-30-2012
20120216518HYDRAULIC CONTROL SYSTEM HAVING CYLINDER STALL STRATEGY - A hydraulic control system for a machine is disclosed. The hydraulic control system may have a hydraulic circuit, and a pump configured to supply pressurized fluid to the hydraulic circuit. The hydraulic control system may also have a first fluid actuator fluidly connected to receive pressurized fluid from the hydraulic circuit, a first valve arrangement movable to control a flow of fluid to the first fluid actuator, a second fluid actuator fluidly connected to receive pressurized fluid from the hydraulic circuit, and a second valve arrangement movable to control a flow of fluid to the second fluid actuator. The hydraulic control system may additionally have a controller in communication with the first and second valve arrangements. the controller may be configured to make a determination of a stall condition of the first fluid actuator, and to selectively change a flow command directed to the second valve arrangement based on the determination.08-30-2012
20120216517HYDRAULIC CONTROL SYSTEM HAVING CYLINDER STALL STRATEGY - A hydraulic control system for a machine is disclosed. The hydraulic control system may have a hydraulic circuit, a pump configured to supply pressurized fluid, and a first sensor configured to generate a first signal indicative of a pressure of the hydraulic circuit. The hydraulic circuit may also have a first fluid actuator fluidly connected to receive pressurized fluid from the hydraulic circuit, a second sensor configured to generate a second signal indicative of a velocity of the first fluid actuator, and a controller in communication with the first and second sensors. The controller may be configured to receive an input indicative of a desired flow rate for the first fluid actuator, to determine an actual flow rate of the first fluid actuator based on the second signal, and to determine a stall condition of the first fluid actuator based on the desired flow rate, the actual flow rate, and the first signal.08-30-2012
20090094971SYSTEM AND APPARATUS TO SYNCHRONIZE A PLURALITY OF HYDRAULICALLY ACTUATED COMPONENTS - Applicants' teachings relate to a system and apparatus to synchronize a plurality of hydraulically actuated components. In various embodiments of applicants' teachings, for example, but not limited to, in an automotive vehicle lift rack, a system and apparatus are disclosed to synchronize the platforms of the lift so that they are coplanar, and in some embodiments, maintained in a generally level configuration. The system comprises a hydraulic fluid reservoir, and at least two hydraulically actuated components in fluid communication by a first fluid flow path with the hydraulic fluid reservoir. Moreover, in accordance with various embodiments of applicants' teachings, a discharge valve is provided, the discharge valve in selective fluid communication by a second fluid flow path with a hydraulic fluid reservoir and the hydraulically actuated components. Moreover, in accordance with various embodiments of applicants' teachings, the system further comprises a control unit responsive to relative displacement of the at least two hydraulically actuated components. The control unit to selectively control the discharge valve, so that in response to the relative displacement of the at least two hydraulically actuated components the control unit activates the discharge valve to allow at least a portion of the hydraulic fluid to flow away by the second fluid flow path from at least one of the hydraulically actuated components and to synchronize the hydraulically actuated components.04-16-2009
20130067899HYDROSTATIC TORQUE CONVERTER AND TORQUE AMPLIFIER - An example includes a hydraulically controllable coupling to couple a rotating input and to an output to rotate, or to decouple the input and the output, with coupling and decoupling modes selected by switching a hydraulic device such as a vane pump between a pumping mode and a mode in which it does not pump. In an example, the system cooperates with a transmission to increase the number of possible gear ratios in some examples.03-21-2013
20120304632Oil jet for increased efficiency - The Oil Jet for Increased Efficiency system makes use of internally developed, and stored, oil pressure to direct additional force to assist moving parts in an internal combustion engine, rotating device of any nature, and/or any power producing mechanism, to assist in overcoming frictional, compression, drag, and other resistive forces within said mechanism in order to increase efficiency.12-06-2012
20110011072MOBILE ENERGY RECOVERY APPARATUS AND METHOD - An energy recovery apparatus and method for recovering and harvesting energy from passing air is disclosed. Energy recovery and harvesting from passing air is accomplished by creating a pressure differential using high and low pressure ports. The energy represented by the pressure differential is extracted using a mass airfoil device which, in turn, is used to create alternative forms of energy which, in turn, is used to support auxiliary and main systems aboard any moving object or form of transport.01-20-2011
20130111890HYDRAULIC START/STOP SYSTEM - A start/stop arrangement in a fluid system comprising a controllable pump unit for supplying fluid pressure to at least one implement; a prime mover connected to a transmission device arranged to drive the pump unit; wherein the pump unit is installed on an outgoing power take off and is arranged to supply fluid pressure to the implement fluid system, that the pump unit is arranged accumulate fluid pressure in the accumulator. The fluid system further comprises a controllable motor unit connected to a fluid accumulator; that fluid pressure from the accumulator is arranged to drive the motor unit; and that the motor unit is connected to the prime mover by an overrun clutch, wherein the motor unit is arranged to supply torque to and start the prime mover when at least one predetermined condition is fulfilled. The invention further relates to a method for controlling the start/stop arrangement.05-09-2013
20120227391DEVICE AND METHOD FOR CONTROLLING HYDRAULIC PUMP OF CONSTRUCTION MACHINERY - The present invention relates to a device for controlling a hydraulic pump of construction machinery. The device has a first pump supplying working fluid through a swing control valve to a swing motor, and a second pump supplying working fluid through a work tool control valve to a work tool actuator, and includes: a first tilting angle control unit for controlling a discharge flow of the first pump by controlling a tilting angle of the first pump according to an input pump control signal; and a controller deducting a discharge pressure (P09-13-2012
20090013681Energized Fluid Motor and Components - A motor comprising a least one piston slideable within a cylinder with a seal, a plurality of valves, means to determine the position of the valves and a head of the piston, means to select the ports in which to transfer energized fluid/exhaust in and out of the cylinder, and a scotch yoke. The cylinder comprising at least a first set of ports and a second set of ports. The ports disposed in a wall of the cylinder. The valves coupled and slideable to allow a selective transfer of an energized fluid in, and an exhaust out, of the cylinder via the ports. The scotch yoke operatively interacting with a crankshaft, the piston operatively connected to the scotch yoke such that, when the energized fluid moves the piston, torque is applied to the crankshaft, and the valves are repositioned to allow the energized fluid to enter the cylinder on the opposite side of the head of the piston and the exhaust to exit the cylinder.01-15-2009
20100089044DRIVE HAVING AN ENERGY STORAGE DEVICE AND METHOD FOR STORING KINETIC ENERGY - The invention relates to a drive (04-15-2010
20100089045HYDRAULIC CONTROL CIRCUIT FOR CONSTRUCTION MACHINE - A hydraulic control circuit includes a hydraulic cylinder, a control valve, a recovery oil passage, a hydraulic pump, an engine rotation speed setting unit, a recovery control valve, and a controller that reduces an engine rotation speed to not more than a preset reduction control engine rotation speed when the load is lowered; and adjusts an increase or decrease in an opening amount of the recovery control valve in accordance with a level of the target rotation speed set by the engine rotation speed setting unit.04-15-2010
20120233993METHOD FOR CONTROLLING A HYDRAULIC SYSTEM OF A WORKING MACHINE - A method is provided for controlling a hydraulic system of a working machine, which hydraulic system includes a first hydraulic machine for providing hydraulic fluid to a first actuator of the working machine, and a second hydraulic machine for providing hydraulic fluid to a second actuator of the working machine and for providing hydraulic fluid to the first actuator. The method includes using a first control mode, and in the first control mode allowing a flow of hydraulic fluid from the second hydraulic machine to the second actuator, wherein the pump pressure of the second hydraulic machine is selected based on the load pressure of the second actuator independently of the load pressure of the first actuator. The method further includes using a second control mode provided that the requested flow to the first actuator exceeds a predetermined threshold value, and in the second control mode allowing a flow of hydraulic fluid from the second hydraulic machine to the first actuator, wherein the pump pressure of the second hydraulic machine is selected based on the highest value of the load pressure of the second actuator and the load pressure of the first actuator.09-20-2012
20120233992WHEEL END WITH INTEGRATED MOTOR ASSEMBLY - A wheel end assembly comprises a wheel hub support housing and a wheel hub drive assembly rotatably connected to the wheel hub support housing. The wheel end assembly also includes a hydraulic motor operatively coupled to the wheel hub drive assembly, the hydraulic motor being disposed to deliver a torque to the wheel hub drive assembly. The wheel end assembly further includes a pump, fluidly coupled to the wheel hub drive assembly and the hydraulic motor, the pump being disposed to provide a flow of hydraulic fluid to the wheel hub drive assembly.09-20-2012
20120233991MULTI-FUNCTION MACHINES, HYDRAULIC SYSTEMS THEREFOR, AND METHODS FOR THEIR OPERATION - Systems and methods for controlling and actuating actuators that perform multiple functions in a machine. Such systems and methods encompass a hydraulic system adapted to control and actuate the actuators of the machine. The hydraulic system includes variable displacement pump/motors connected to the engine in parallel. A first of the pump/motors controls a first of the actuators, and a second of the pump/motors is adapted to draw power from and deliver power to the engine and the first actuator, as well as control at least a second of the actuators. An energy storage device is connected in series with the second pump/motor and the second actuator, and accumulates a fluid pumped thereto by the second pump/motor, as well as delivers the fluid to the second pump/motor, depending on whether the second pump/motor delivers is delivering or drawing power from the engine or first actuators.09-20-2012
20120233990METHOD FOR OPERATING A HYDRAULIC DRIVE DEVICE AND METHOD OF OPERATING THE SAME - The invention relates to a method for operating a hydraulic drive device comprising a hydraulic piston-cylinder unit having a working piston that can be moved in a working direction between an upper dead point and a lower dead point, a set point for the position of the working piston in the working direction being predefined, and an actual value of the position of the working piston in the working direction being interrogated, and the movement of the working piston being regulated as a function of the set point and the actual value. The invention additionally relates to a hydraulic drive device.09-20-2012
20080295505Method for Springing a Movement of an Implement of a Work Machine - A method for springing a movement of an implement of a work machine during a movement of the work machine is provided, in which at least one hydraulic cylinder is connected to the implement for controlling its movements, comprising the steps of connecting a hydraulic machine to the hydraulic cylinder, and of controlling the hydraulic machine in response to a disturbance acting upon the implement during the movement of the work machine.12-04-2008
20080295504Method For Controlling a Hydraulic Cylinder in a Work Machine - A method is provided for controlling a hydraulic cylinder in a work machine, which hydraulic cylinder is arranged to move an implement in relation to a part of a vehicle, with the hydraulic cylinder being controlled by a hydraulic machine. The method includes the steps of detecting initiation of a movement of the implement that is such that the piston of the hydraulic cylinder is moved in a first direction, of driving the hydraulic machine in a first rotational direction, prior to the movement of the implement taking place, so that a line from the hydraulic machine is pressurized, which line is arranged to connect the hydraulic machine to the side of the cylinder toward which the piston will be moved during the movement of the implement.12-04-2008
20130125537SWIRL FLOW CONTROL SYSTEM FOR CONSTRUCTION EQUIPMENT AND METHOD OF CONTROLLING THE SAME - A swing flow control system for a construction machine is provided, which includes an engine; a plurality of actuators for working devices; a variable displacement hydraulic pump providing hydraulic pressure to the actuators for the working devices and the swing motor; an operation portion including an operation lever or a joystick and instructing movement of the plurality of actuators; a control valve supplying a flow rate of the hydraulic pump to the actuators and the swing motor by the operation portion; a working device position detection means, installed on one side of the actuator; an operation amount sensing means, connected to one side of the operation portion; and a flow controller including a flow setting unit and an output means for providing a control signal to a swash plate control device to receive a signal sensed by the operation amount sensing means.05-23-2013
20130160435PROCESS FOR THE PRODUCTION OF HYDRAULIC ENERGY AND PRODUCTION OF POTABLE WATER BY DIRECT OSMOSIS - The present invention relates to a process for the production of hydraulic energy by direct osmosis from two saline solutions having different concentrations made to pass through one or more modules of semipermeable membranes having a double inlet and outlet port, originally designed to execute the process of inverse osmosis, without a requirement to realise any technical modification to said modules of membranes. In this manner, an osmotic potential is produced in the membranes creating a current of solution having a pressure sufficient to produce hydraulic energy. A further object of the present invention is the installation designed to produce hydraulic energy according to the stated procedure and the use thereof, together with a desalination plant and a tertiary waste water treatment plant comprising the installation to produce hydraulic energy.06-27-2013
20130160436ELECTRO-HYDRAULIC TRACTION SUPPORT - A traction control system comprises a wheel hydraulic motor and pump assembly selectively connectable to a wheel for a vehicle to provide drive to the wheel. An electronic control unit is connected to a main hydraulic control valve to control fluid flow from the main hydraulic motor and pump assembly to the wheel motor and pump assembly. A high pressure accumulator and reservoir are fluidly connected to the main hydraulic motor and pump assembly to provide pressurized fluid to the system.06-27-2013
20130160437SYSTEMS AND METHODS FOR EFFICIENT PUMPING OF HIGH-PRESSURE FLUIDS FOR ENERGY STORAGE AND RECOVERY - In various embodiments, a mechanical assembly and/or storage vessel is fluidly coupled to a circulation apparatus for receiving pressurized heat-transfer fluid from an outlet at a first elevated pressure, boosting a pressure of the heat-transfer fluid to a second pressure larger than the first pressure, and returning heat-transfer fluid to an inlet at a third pressure.06-27-2013
20120090309Swing Control Apparatus and Swing Control Method for Construction Machinery - Disclosed is a swing control apparatus of construction machinery, including: a hydraulic pump discharging working oil for driving a swing motor and controlling a discharge flux according to an input pump command value Vpump; a pressure sensor sensing pressure of the working oil discharged from the hydraulic pump; and a control unit calculating the pump command value Vpump based on a swing operation quantity Vsw input from the swing operation unit to output the calculated pump command value to the hydraulic pump, wherein when the input swing operation quantity Vsw is larger than a preset reference swing operation quantity Vswo and the discharge pressure Ppump of the hydraulic pump detected by the pressure sensor is lower than a first reference pressure Pswr04-19-2012
20100281857System and Method of Maintaining Pressure of a Hydraulic Motor - A system and method of maintaining pressure of a hydraulic motor is disclosed. The system includes a plurality of pistons disposed about a periphery of a flywheel, wherein each piston is compressed by a roller during each revolution of the flywheel. As each piston is engaged and pushes against the roller, the piston is forced inward and forces hydraulic fluid out of the cylinder adding pressure to the system to run the hydraulic motor. In addition, the piston pushing against the roller causes the flywheel to continue to rotate. As the force acting on the piston causes the flywheel to rotate, the next piston starts to approach the position of the prior piston. This action continues as long as the fluid is under pressure when it enters each cylinder.11-11-2010
20100095661DRIVE SYSTEM AND METHOD FOR RECOVERING WASTE ENERGY FROM A VEHICLE - A drive system, including a torque converter with a housing arranged for connection to a combustion engine for a vehicle; and an air-operated motor, connected to the housing, for providing torque to the housing for the torque converter; or an air compressor, connected to the housing, for using torque from the housing to compress air. In one embodiment, the system includes a compressed air accumulator for providing compressed air to the air-operated motor; and a heat exchanger for transferring heat energy to compressed air provided to the air-operated motor from the accumulator. A drive system, including a combustion engine with a crankshaft; a plurality of pistons and cylinders for combusting fuel; and a cylinder and piston, the piston connected to the crankshaft. The system also includes a compressed gas accumulator for supplying compressed gas to the cylinder to operate the first piston to provide torque to the crankshaft.04-22-2010
20120279209SYSTEMS AND METHODS FOR ENERGY STORAGE AND RECOVERY USING COMPRESSED GAS - The invention relates to methods and systems for the storage and recovery of energy using open-air hydraulic-pneumatic accumulator and intensifier arrangements that combine at least one accumulator and at least one intensifier in communication with a high-pressure gas storage reservoir on a gas-side of the circuits and a combination fluid motor/pump, coupled to a combination electric generator/motor on the fluid side of the circuits.11-08-2012
20110138796Method of activating a mountable hydraulic appliance, and such mountable hydraulic appliance, in particular for demolition, comminution or recycling - The invention relates to a method of activating a mountable hydraulic appliance, and to such mountable hydraulic appliance for the shearing or crushing of structures, in particular for demolition, comminution or recycling, said appliance having an upper jaw and a lower jaw at least one of which is pivotally hinged on a bearing axis arranged on the housing, the hinged jaw being activated by a first hydraulic cylinder and by at least one further hydraulic cylinder acting thereon so as to be moved from an open position to a cutting position and/or a closed position and vice versa, the hydraulic cylinders which act upon the hinged jaw being either pressurised simultaneously, or the initiation of a closing movement of the at least one hinged jaw from an open position being such that initially only one hydraulic cylinder is pressurised and, as the required compression force increases during the closing movement, the at least one further hydraulic cylinder is equally pressurised.06-16-2011
20100000208HYDRAULIC FLUID AND METHOD - There are provided hydraulic fluids comprising at least one phospholipid lubricant blended with one or more of a glycol, glycerol or a glycerol ester and having a water content of less than 10% by weight. Also provided are hydraulic systems and methods of using and manufacturing hydraulic fluids.01-07-2010
20110277456HYDRAULICALLY-POWERED COMPRESSOR - Apparatus and method for processing a process fluid at a remote location, with the apparatus including a pump located at a first location and configured to provide a pressurized working fluid. The apparatus also includes an umbilical coupled to the pump such that the umbilical receives the pressurized working fluid from the pump and transports the pressurized working fluid therefrom. The apparatus further includes a hydraulic turbine disposed at the remote location and coupled to the umbilical such that the hydraulic turbine receives the pressurized working fluid from the umbilical. The apparatus additionally includes one or more shaft energy conversion devices operatively coupled to the hydraulic turbine and disposed at the remote location.11-17-2011
20130205763METHOD OF CONTROLLING HYDRAULIC MACHINE TO REDUCE TORQUE RIPPLE AND/OR BEARING SIDE LOAD - A hydraulic machine in which the volume of working fluid displaced by each cylinder is selectable on each cycle of working chamber volume by active control of one or more electronic valves has a controller configured to select specified groups of cylinders to repetitively carry out active cycles until a change in selection is made. The groups are selected to reduce torque ripple and/or bearing side load. The cam profile may be varied to further reduce torque ripple.08-15-2013
20100199652Multistage Hydraulic Gas Compression/Expansion Systems and Methods - Multistage hydraulic systems and methods for converting the potential energy of a pressurized gas, particularly air, into mechanical work when operating in motor, and for producing compressed gas from the mechanical work of the rotating shaft when rotating when operating in compressor mode, by performing a successive expansion/compression of the said gas. Each of the systems comprises: a multistage Compression-Expansion Unit made of several hydraulic Compression-Expansion Modules having different capacity and integrating a gas/liquid separating heat exchanger, designed to convert pressure power into a hydraulic power and vice-versa, by performing an essentially isothermal compression/expansion of the gas; a single stage or multistage, direct or indirect, external forced-air Heat Exchanger for maintaining the active liquid at ambient temperature; and a multi-circuit, multi-displacement Hydraulic Motor/Pump for converting hydraulic power into mechanical power and vice-versa.08-12-2010
20110283691MULTIPLE FLUID PUMP COMBINATION CIRCUIT - A method of combining outputs of a plurality of fluid pumps includes receiving an input signal from an input device. The input signal is adapted to control a function of a work vehicle. An actuation signal is sent to a first direction control device of a first actuator assembly. The first actuator assembly is in selective fluid communication with a first pump assembly. A position of a second direction control valve of a second actuator assembly is received. The second actuator assembly is in selective fluid communication with a second pump assembly. A selector valve that is in fluid communication with a cavity of a poppet valve assembly is actuated so that the second pump assembly is in fluid communication with the first actuator assembly when the second direction control valve is in a neutral position.11-24-2011
20110271667HYDRAULIC DRIVE DEVICE HAVING TWO PRESSURE CHAMBERS AND METHOD FOR OPERATING A HYDRAULIC DRIVE DEVICE HAVING TWO PRESSURE CHAMBERS - The invention relates to a hydraulic drive device, comprising a piston which is guided displaceably in a cylinder chamber along a working axis and adjoins a working pressure chamber that can be pressurized by hydraulic fluid, and comprising a control means that is guided in the piston at least in some sections between different control states in order to control the flow of the hydraulic fluid from a high pressure supply into the working pressure chamber to move the piston in the working direction and from the working pressure chamber to a return flow chamber, wherein the region of the piston facing away from the working pressure chamber delimits a low pressure chamber that is pressurized by a low pressure supply for hydraulic fluid during the operation of the device such that the piston is moved back against the working direction when the control means connects the working pressure chamber to the return flow chamber. The invention furthermore relates to a method for operating a hydraulic drive device.11-10-2011
20110283690HEAT EXCHANGE WITH COMPRESSED GAS IN ENERGY-STORAGE SYSTEMS - In various embodiments, compressed-gas energy storage and recovery systems include a cylinder assembly for compression and/or expansion of gas, a reservoir for storage and/or supply of compressed gas, and a system for thermally conditioning gas within the reservoir.11-24-2011
20110289908HYDRAULIC SYSTEM HAVING IMPLEMENT AND STEERING FLOW SHARING - A hydraulic system for a machine is disclosed. The hydraulic system may have a first pump with variable displacement and being load-sense controlled, and a first hydraulic circuit associated with the first pump. The hydraulic system may also have a second pump with variable displacement and being electro-hydraulically controlled, and a second hydraulic circuit associated with the second pump. The hydraulic system may further have a flow-sharing valve arrangement configured to selectively share fluid flow between the first and second hydraulic circuits.12-01-2011
20110296822EFFICIENCY OF LIQUID HEAT EXCHANGE IN COMPRESSED-GAS ENERGY STORAGE SYSTEMS - In various embodiments, efficiency of energy storage and recovery systems employing compressed air and liquid heat exchange is improved via control of the system operation and/or the properties of the heat-exchange liquid.12-08-2011
20090133393METHOD FOR OPERATING A HYDROPNEUMATIC DEVICE, AND HYDRAULIC FLUID PUMP FOR THE MAINTENANCE OF A HYDROPNEUMATIC DEVICE - A method is disclosed for operating a hydropneumatic device (05-28-2009
20110214420DIAGNOSIS MANAGEMENT SYSTEM AND DIAGNOSIS MANAGEMENT METHOD FOR A VALVE-CONTROLLED HYDROSTATIC DISPLACEMENT UNIT - A diagnosis management system for a hydrostatic displacement unit, including a control unit for controlling a drive motor, a hybrid control unit for controlling the motor control unit on the basis of at least one desired acceleration signal and one desired deceleration signal for the drive motor, a gear control unit for controlling the motor control unit on the basis of at least signals derived from a continuously variable gear, and a control unit for a digital displacement unit, for controlling at least one pump motor as the digital displacement unit is disclosed. The control unit for a digital displacement unit has at least one diagnostic interface, which detects operating values and/or operating states in order to detect system errors in the pump motor, a sensor unit portion associated with the pump motor, and/or a power electronics portion associated with the pump motor; and at least one calculation portion, which preprocesses the operating values and/or operating states detected by the diagnostic interface. The at least one diagnostic interface and the at least one calculation portion are disposed for operating in a first system direction for diagnosis and for determining a correction of incident system errors, and in a second system direction for diagnosis and/or for performing the correction of incident system errors. A diagnosis management method can be performed by the diagnosis management system.09-08-2011
20120096843WORK VEHICLE LIFTING PERFORMANCE - A work vehicle includes a fluid circuit to operate at least one implement for performing work, the fluid circuit having at least a first operating mode and a second operating mode. The first operating mode is configured to operate within a first predetermined flow rate range within a first predetermined fluid pressure level range. The second operating mode is configured to operate within a second predetermined flow rate range and within a second predetermined fluid pressure level range. In response to the fluid circuit operating within the second operating mode, a maximum pressure value of the second predetermined fluid pressure level range is greater than a maximum pressure value of the first predetermined fluid pressure level range, and a maximum value of the second predetermined flow level range is less than a maximum value of the first predetermined flow level range.04-26-2012
20120023918FLUID WORKING MACHINE AND METHOD OF OPERATING A FLUID WORKING MACHINE - A fluid working machine comprises a working chamber of cyclically varying volume, a high pressure manifold, and an actuated high pressure valve for regulating the flow of fluid between the working chamber and the high pressure manifold. The actuated high pressure valve comprises a moveable valve member, operable between a closed position and at least one open position. A controllable opening mechanism provides an active urging force to urge the moveable valve member from the said closed position towards at least one said open position, the volume of the working chamber varying between a maximum volume and a minimum volume. The controllable opening mechanism provides the active urging force more than once while the volume of the working chamber is intermediate the maximum of chamber volume and the minimum of chamber volume.02-02-2012
20110005214Hydraulic system - A hydraulic system for actuating a motor vehicle transmission by a control hydraulic power source that includes a control hydraulic pump for providing a high hydraulic pressure, a control pressure accumulator, and a low-pressure hydraulic pump for providing low-pressure volumetric flow of hydraulic fluid for operating a low-pressure hydraulic component. The low-pressure pump is operatively drivingly connected with the control hydraulic pump that is connected in a charged manner with the control pressure accumulator and with a transmission actuator.01-13-2011
20120186241METHOD FOR RECOVERING KINETIC ENERGY OF HYBRID ELECTRIC VEHICLES, AND ENERGY ACCUMULATOR USING COMPRESSED AIR - The claimed innovation relates to an energy accumulator using compressed air for hybrid electric vehicles, which makes it possible to recover the electric energy generated from the vehicle kinetic energy, and store it using compressed air. This configuration increases the global efficiency, performance and operational reliability of the vehicle, reduces energy waste and ensures the availability and use of regenerating brakes in these conditions.07-26-2012
20100126160METHOD FOR CONVERTING A FLUCTUATING AND/OR ERRATIC ENERGY SUPPLY INTO A STABLE ENERGY SOURCE - In a method for converting fluctuating energy into a stable energy supply, the fluctuating energy is derived from the group of solar energy, wind power, waves or water currents, this energy being delivered to a first pump being integrated in a pressure circuit for delivering stable energy and the pressure circuit comprising a pressure amplifier with a double-cone device being driven by the liquid flow circulated by the first pump. This allows the stabilisation of fluctuating energy to be used e.g. in desalination plants without supplemental storage energy and without reverting to electric current conversion.05-27-2010
20130098012METERLESS HYDRAULIC SYSTEM HAVING MULTI-CIRCUIT RECUPERATION - A hydraulic system is disclosed. The hydraulic system may have a first meterless circuit with a first pump fluidly connected to a first actuator in a closed-loop manner, and a second meterless circuit with a second pump fluidly connected to a second actuator in a closed-loop manner. The hydraulic system may also have at least one accumulator configured to receive pressured fluid from and discharge pressurized fluid to the first and second meterless circuits.04-25-2013
20130098013CLOSED-LOOP SYSTEM HAVING MULTI-CIRCUIT FLOW SHARING - A hydraulic system is disclosed. The hydraulic system may have a plurality of pumps with unidirectional functionality and being variable displacement, a common discharge passage connected to the plurality of pumps, and a common intake passage connected to the plurality of pumps. The hydraulic system may also have at least one actuator connected in closed-loop manner to the common discharge and common intake passages, and a switching valve associated with the at least one actuator and disposed between the at least one actuator and the common discharge and intake passages. The hydraulic system may additionally have at least one isolation valve configured to selectively isolate a portion of the common discharge passage and a portion of the common intake passage associated with one pump of the plurality of pumps from another pump of the plurality of pumps.04-25-2013
20130098015HYDRAULIC SYSTEM HAVING FLOW COMBINING CAPABILITIES - A hydraulic system hydraulic system includes a variable displacement pump, and a variable displacement first travel motor selectively fluidly connected to the pump in a closed-loop manner. The system also includes a first switching valve associated with the first travel motor and configured to selectively switch a flow direction of fluid passing through the first travel motor from the pump. The system further includes a variable displacement second travel motor selectively fluidly connected to the pump in a closed-loop manner. The system also includes a second switching valve associated with the second travel motor and configured to selectively switch a flow direction of fluid passing through the second travel motor from the pump.04-25-2013
20130098017Hydraulic System - A method of controlling a hydraulic system includes providing fluid to a first actuator with a first pump via a first closed-loop circuit of a machine, and providing fluid to a second actuator with a second pump via a second closed-loop circuit of the machine. The method also includes providing fluid to a third actuator with a third pump via a third closed-loop circuit of the machine, and providing fluid to a fourth actuator with a fourth pump via a fourth closed-loop circuit of the machine. The method further includes forming a combined flow of fluid including fluid from the first circuit and fluid from at least one of the second, third, and fourth circuits, and directing the combined flow to the first actuator while providing fluid to the actuator of the at least one of the second, third, and fourth circuits.04-25-2013
20090120083PROCESS FOR ELECTRO-HYDRAULIC CIRCUITS AND SYSTEMS INVOLVING EXCAVATOR BOOM-SWING POWER MANAGEMENT - A method of controlling an electro-hydraulic system having an engine driving a variable displacement pump, a hydraulic valve and a hydraulic actuator in order to achieve more efficient engine operation is disclosed. The pressures in the electro-hydraulic system are monitored and commands are received indicating the desired movement of the hydraulic actuator. Based on the pressure and the commands, the operation being performed by the machine is determined and the engine is set to an efficient setting for the particular segment of machine operation.05-14-2009
20100218492COMPRESSED GAS-DRIVEN DEVICE WITH PASSIVE THERMODYNAMIC COMPOSITION - The present invention is directed generally to a system and method which employ a compressed gas-driven device with a passive thermodynamic composition. Certain embodiments provide a compressed gas-driven (e.g., CO09-02-2010
20090288407CONTROLLER FOR A MOTOR AND A METHOD OF CONTROLLING THE MOTOR - A pumping apparatus for a jetted-fluid system includes a pump having an inlet connectable to the drain, and an outlet connectable to the return. The pump is adapted to receive the fluid from the drain and jet fluid through the return. The pumping apparatus includes a motor coupled to the pump to operate the pump, a sensor connectable to the power source and configured to generate a signal having a relation to a parameter of the motor, and a switch coupled to the motor and configured to control at least a characteristic of the motor. The pumping apparatus also includes a microcontroller coupled to the sensor and the switch. The microcontroller is configured to generate a derivative value based on the signal, and to control the motor based on the derivative value.11-26-2009
20090288406Drivetrain system having simultaneous displacement control - A drivetrain system for use in a mobile machine is disclosed. The drivetrain system may have a first rotary fluid actuator, a second rotary fluid actuator, an input device, and a controller in communication with the first rotary fluid actuator, the second rotary fluid actuator, and the input device. The controller may be configured to determine a desired change in an effective gear ratio of the drivetrain system, and determine a total displacement change associated with the first and second rotary fluid actuators that produces the desired change in the effective gear ratio. The controller may also be configured to compare the total displacement change to a threshold change level, affect simultaneous displacement changes in the first and second rotary fluid actuators when the total displacement change exceeds the threshold change level, and affect sequential displacement changes in the first and second rotary fluid actuators when the total displacement change is less than the threshold change level.11-26-2009
20100275589Electro-Hydraulic Auxiliary Mode Control - A work machine (11-04-2010
20130213023HYDRAULIC SYSTEM HAVING LOW-SPEED OPERATING MODE - A hydraulic system is disclosed for use with a machine. The hydraulic system may have a tank, a motor with a fluid inlet and a fluid outlet, and a pump configured to draw fluid from the tank and discharge the fluid at elevated pressures to the motor. An output of the pump is adjustable to regulate a speed of the motor. The hydraulic system may also have a low-speed valve located between the fluid outlet of the motor and the tank. The low-speed valve may be configured to reduce a positive speed of the motor below a lowest positive speed attainable through control of pump output.08-22-2013
20120291426Autonomous Electricity Production and Conditioning System for an Aircraft, Associated Aircraft and Method - The system according to the invention comprises a rotary shaft (11-22-2012
20090266067ARRANGEMENT FOR OPERATING A HYDRAULIC DEVICE - A fluid system includes a controllable first pump unit for supplying fluid pressure to at least one implement; a prime mover arranged to supply a driving torque to the first pump The first pump unit is arranged to supply fluid pressure to the implement. The fluid system further includes a controllable second pump unit connected to a fluid accumulator. The prime mover is arranged to supply a driving torque to the second pump unit in order to accumulate fluid pressure in the accumulator during periods of low demand. Fluid pressure from the accumulator is arranged to drive the second pump unit to assist the prime mover during periods of high demand in order to supply an additional driving torque in excess of the available driving torque from the prime mover.10-29-2009
20120067036COMPRESSED AIR ENERGY STORAGE SYSTEM UTILIZING TWO-PHASE FLOW TO FACILITATE HEAT EXCHANGE - A compressed-air energy storage system according to embodiments of the present invention comprises a reversible mechanism to compress and expand air, one or more compressed air storage tanks, a control system, one or more heat exchangers, and, in certain embodiments of the invention, a motor-generator. The reversible air compressor-expander uses mechanical power to compress air (when it is acting as a compressor) and converts the energy stored in compressed air to mechanical power (when it is acting as an expander). In certain embodiments, the compressor-expander comprises one or more stages, each stage consisting of pressure vessel (the “pressure cell”) partially filled with water or other liquid. In some embodiments, the pressure vessel communicates with one or more cylinder devices to exchange air and liquid with the cylinder chamber(s) thereof. Suitable valving allows air to enter and leave the pressure cell and cylinder device, if present, under electronic control.03-22-2012
20080264051Working Machine and a Method for Operating a Working Machine - A working machine including an internal combustion engine for supplying torque to the driving wheels of the working machine, and a transmission line arranged between the internal combustion engine and the driving wheels for transmitting torque from the internal combustion engine to the driving wheels. The working machine further including at least one hydraulic pump in a hydraulic system for moving an implement arranged on the working machine and/or steering the working machine. The transmission line includes at least one electric machine for driving or braking the driving wheels, and/or for generating electric power for the at least one hydraulic pump.10-30-2008
20090211239Pressure accumulator to establish sufficient power to handle and operate external equipment and use thereof - A pressure accumulator (08-27-2009
20090241531Hydraulic control device for starting device - A hydraulic control device includes a first oil path; a second oil path; a third oil path; an engagement pressure generation unit; a signal pressure generation unit; and an internal pressure switching unit that switches between a non-reduced pressure state where locking occurs due to the signal pressure inputted and a source pressure is outputted unchanged as internal pressure to the first oil path, and a reduced pressure state where the signal pressure is not inputted and a hydraulic pressure is regulated to a constant pressure from the source pressure, based on a feedback pressure of the internal pressure and an urging force of a first urging unit, and outputted as the internal pressure to the first oil path.10-01-2009
20090241530Method of Operating a Fluid-Working Machine and a Fluid-Working Machine - The present invention provides a method of controlling a fluid working machine (10-01-2009
20090255245HYDRAULIC SYSTEM INCLUDING PRIORITY BASED VALVE SEQUENCING - An exemplary hydraulic system includes a plurality of digital valves, each valve fluidly connectable to a corresponding hydraulic load. The digitals valves are operable to fluidly connect the corresponding hydraulic load to a pressure source. The hydraulic system further includes a digital controller operably connected to the plurality of digital valves. The digital controller is configured to assign a priority level so that it is associated with each of a plurality of hydraulic loads, and to formulate a pulse width modulated control signal based on the assigned priority levels. The digital controller transmits the control signal to the plurality of digital valves for controlling the operation of the valves.10-15-2009
20090255244Continuous fluid circuit electricity generating system - A continuous fluid circuit electricity generating system for producing relatively expensive electricity without polluting the atmosphere or consuming natural resources. A first turbine submerged in a source of water (e.g., a man-made tank or a naturally-occurring well or larger body of water) supplies water under pressure from the source to a water propulsion turbine. The water propulsion turbine has a rotatable shaft coupled to the shaft of a first generator of electricity and a set of hollow impeller arms coupled to and rotatable with the turbine shaft. The impeller arms of the water propulsion turbine are located in proximity to a rotatable driven rotor having a coupling sleeve surrounding the shaft of a second generator of electricity. Water moving through and expulsed from the hollow impeller arms causes the impeller arms, the shaft of the water propulsion turbine, and the shaft of the first generator to rotate in a first direction. The water expulsed from the hollow impeller arms strikes impact surfaces of the rotatable driven rotor to cause the driven rotor, the coupling sleeve of the driven rotor, and the shaft of the second generator to rotate in an opposite direction. The water which has been ejected from the impeller arms is then returned to the source for reuse.10-15-2009
20090255246HYDRAULIC SYSTEM INCLUDING OPEN LOOP AND CLOSED LOOP VALVE CONTROL SCHEMES - An exemplary hydraulic system includes a digital valve operable to fluidly connect a hydraulic load to a pressure supply. A digital controller is operably connected to the digital valve. The digital controller stores a target value of a hydraulic system operating parameter and is configured to formulate a pulse width modulated control signal based on the target value. The digital controller transmits the control signal to the digital valve for controlling the operation of the valve.10-15-2009
20090260352HYDRAULIC SYSTEM HAVING LOAD SENSING CAPABILITIES - An exemplary hydraulic system includes a digital valve operable to fluidly connect a hydraulic load to a pressure supply, and an orifice disposed in a flow path between the hydraulic load and the digital valve. A digital controller is operably connected to the digital valve. The digital controller stores a target pressure drop across the orifice and is configured to determine an actual pressure drop across the orifice and formulate a control signal based on the target pressure drop and the actual pressure drop. The controller transmits the control signal to the digital valve for controlling the operation of the valve.10-22-2009
20100146958SYSTEM FOR CONTROLLING A HYDRAULIC SYSTEM - A method of operating a hydraulic system is disclosed. The method includes holding an implement configuration in an orientation. The method also includes sensing a pressure within a chamber of a hydraulic actuator associated with the implement configuration when the implement configuration is in the orientation and comparing a first signal indicative of the first sensed pressure with a first pressure value. The method further includes selecting a first functional relationship from among a plurality of stored functional relationships if the first signal is greater than the first pressure value and selecting a second functional relationship from among the plurality of stored functional relationships if the first signal is less than the first pressure value. The method includes controlling the hydraulic actuator based on the selected functional relationship.06-17-2010
20100154400HYDRAULIC CONTROL SYSTEM UTILIZING FEED-FOWARD CONTROL - The present disclosure is directed toward a hydraulic control system. The system may have a pump and a tool actuator configured to move a tool with a flow of pressurized fluid provided by the pump. The system may further have a tool control valve configured to control the flow of pressurized fluid to the tool actuator. The system may also have a controller operably connected with the tool control valve and the pump. The controller may be configured to receive a tool movement request. The controller may further be configured to estimate a change in a flow demand across the tool control valve associated with the tool movement request. The controller may also be configured to command adjustment of a discharge flow rate of the pump based on the estimated change in flow demand to satisfy the tool movement request.06-24-2010
20100162694DEPALLETING UNLOADING CONVEYOR - The invention describes a depalleting device (07-01-2010
20130213024HYDRAULIC DRIVE AND METHOD FOR CONTROLLING SUCH A HYDRAULIC DRIVE - A hydraulic drive and method for controlling such a drive includes two drive motors configured to be controlled by at least one continuously adjustable distribution valve. The two drive motors are configured as adjustable hydraulic machines.08-22-2013
20130213025Hydraulic Pressure Generator for a Vehicle Brake System, Vehicle Brake System Having Such a Hydraulic Pressure Generator, and Method for Operating the Hydraulic Pressure Generator - A hydraulic pressure generator for a vehicle brake system comprises a piston and a cylinder that movably accommodates the piston. The piston defines a first hydraulic chamber and a second hydraulic chamber in the cylinder on opposite piston sides, wherein each hydraulic chamber has a hydraulic inlet and a hydraulic outlet. An actuating unit is able to put the piston into a back-and-forth motion so that an intake stroke with regard to the first hydraulic chamber corresponds to a discharge stroke with regard to the second hydraulic chamber, and vice versa.08-22-2013
20130213026DRIVE CONTROL METHOD OF OPERATING MACHINE - In drive control of an operating machine configured to drive a structure by a hydraulic motor configured to be driven by operating oil supplied from a hydraulic pump an electric motor configured to cooperate with the hydraulic motor, a speed command generated based on a manipulation amount of a remote control valve configured to determine an operation amount of the structure is subjected to speed feedback control performed based on the actual rotation speed of the hydraulic motor and pressure difference feedback control performed based on an operating oil pressure difference between a suction port and discharge port of the hydraulic motor. With this, a tilting angle command is generated such that the operating oil, the amount of which is necessary at the actual rotation speed of the hydraulic motor, is ejected, and the tilting angle of the hydraulic pump is controlled.08-22-2013
20100257853PROTECTION VALVE FOR HYDRAULIC DRIVE SYSTEM - A protection valve for a hydraulic drive system and a method for protecting the hydraulic drive system and pumping equipment driven by the hydraulic drive system includes a valve body, an actuator shaft movably disposed within the valve body, a thermal actuator for displacing the actuator shaft between an un-actuated position and an actuated position, and a poppet attached to the actuator shaft for movement therewith. The thermal actuator is configured to displace the actuator shaft between the un-actuated position and the actuated position in response to a hydraulic oil temperature that exceeds a predetermined maximum. A thermal actuator body is rigidly attached to the valve body at one end and a valve seat body is rigidly attached to the valve body at the other end. The thermal actuator body has openings formed therein for placing hydraulic oil in fluid communication with the thermal actuator.10-14-2010
20100257852Vacuum Accumulator System and Method for Regenerative Braking System - A vacuum accumulator system includes a booster, a vacuum accumulator disposed in fluid communication with the booster and an engine disposed in fluid communication with the vacuum accumulator.10-14-2010
20100154399METHOD FOR RECUPERATING POTENTIAL ENERGY DURING A LOWERING OPERATION OF A LOAD - method is provided for recuperating potential energy during a lowering operation of a load, wherein a hydraulic system is adapted to lift and lower the load. In the method, at least two energy recuperation modes are provided, one of the modes is selected in response to a current operating state, and the hydraulic system is controlled according to the selected mode06-24-2010
20100192561ADAPTIVE, LOW-IMPACT VEHICLE ENERGY HARVESTER - An adaptive, low-impact vehicle energy harvester system, and a method of harvesting vehicle energy, is provided. The system includes a plurality of channels disposed longitudinally in a trafficway, wherein each of the plurality of channels includes one or more compressible, elongated hollow bodies such that a movement of a vehicle along the trafficway causes contents in the elongated hollow bodies to be expelled from one end, a motor in communication with the hollow bodies such that the contents expelled from one end of the hollow bodies actuate the motor, and a control unit that varies a resistance to the movement of the contents in the elongated hollow bodies based on at least one of a mass of the vehicle, a velocity of the vehicle, and a rate of change of velocity of the vehicle.08-05-2010
20100192562CONTROL SYSTEM AND METHOD FOR CONTROLLING AT LEAST TWO HYDRAULIC CONSUMERS - The invention relates to a control arrangement and a method for controlling at least two hydraulic consumers. According to the invention, when a pre-determined maximum load pressure of one of the consumers is exceeded, the pump is controlled according to the pressure medium requirement of the other consumer having a lower load.08-05-2010
20100212306Hydraulic Drive System And Diagnostic Control Strategy For Improved Operation - A method and apparatus are provided for hydraulic fluid supply between a hydraulic pump and a hydraulic drive unit, switching hydraulic fluid flow direction to the hydraulic drive unit or stopping hydraulic fluid flow to the hydraulic drive unit when measured hydraulic fluid pressure crosses a predetermined pressure threshold value. The method further comprises calculating an amount of mechanical work done by the hydraulic drive unit and warning an operator or limiting hydraulic fluid flow rate to the hydraulic drive unit when the calculated mechanical work for the drive cycle is less than an expected amount of mechanical work. The apparatus for practicing the method further includes a pressure sensor associated with a hydraulic fluid supply conduit between the pump and the drive unit, and an electronic controller programmed to operate the drive system according to the method.08-26-2010
20100212305COUNTERBALANCING ARRANGEMENT - A counterbalancing arrangement and a method for counterbalancing two mutually movable parts, which is arranged to counteract the gravitational force of at least one of the movable parts. The counterbalancing arrangement includes a gas spring and a compressor system. The compressor system is designed to sense a pressure in the gas spring and to adjust the pressure if the pressure deviates from a predetermined value. The counterbalancing arrangement can be used for counterbalancing an industrial robot arm and is capable of maintaining its working capacity regardless of any gas leakage and variations in the ambient temperature so as to result in very few unwanted stops occasioned by a need for servicing the balancing spring of the counterbalancing arrangement.08-26-2010
20100242466Force transmission device with a rotational speed adaptive damper and method for improving the damping properties - The invention relates to a force transmission device for power transmission between an input and an output, comprising at least an input and an output, and a vibration damping device disposed in a cavity that can be filled at least partially with an operating medium, in particular oil, the vibration damping device coupled with a rotational speed adaptive absorber, wherein the rotational speed adaptive absorber is tuned as a function of an oil influence to an effective order q09-30-2010
20100242464LOAD SENSING SYSTEM, WORKING MACHINE COMPRISING THE SYSTEM, AND METHOD FOR CONTROLLING A HYDRAULIC FUNCTION - A load sensing system includes a first assembly of actuators for controlling a first hydraulic function, a pump adapted to supply the actuators with pressurized hydraulic fluid, an electrically controlled valve adapted to control the output pressure of the pump via a hydraulic signal, a first pressure sensor for detecting a load pressure of the first actuator assembly, and a control unit adapted to receive a signal with information about the load pressure detected by the first pressure sensor and to generate a control signal, corresponding to the detected load pressure, to the electrically controlled valve.09-30-2010
20100242465Shock Absorbing Fluidic Actuator - A fluidic actuator and a control system for the fluidic actuator are described. A first component of the actuator may have two openings interconnected by a passageway. A second component may be moveably housed within the passageway and divide the passageway into two portions. A fluid delivery system may be connected to the two openings. The fluid delivery system may supply a first pressure of fluid to the first portion of the passageway causing the second component to move within the passageway at a first speed. When the second component is in a selected position within the passageway, the fluid delivery system may reduce the pressure of the fluid, causing a reduction in speed of the second component. The fluidic actuator may be used in a wafer processing system.09-30-2010
20120137667Regenerative Hydraulic Pump - A regenerative hydraulic pump that allows for efficient operation of a hydraulic system under high pressure/low flow conditions that comprises a crankshaft providing a rotating inertial mass, and a regenerative hydraulic pump cylinder that comprises a pump cylinder housing, a pump piston mechanically connected to the crankshaft; and a compliant pressure chamber that stores a portion of the energy extracted by the pump piston during a pumping stroke for release back to the pump piston and to the crankshaft during a regenerative back stroke.06-07-2012
20100024409CONTROL SYSTEM FOR VARIABLE DISPLACEMENT PUMP-MOTOR TYPE TRANSMISSION - A control system for a variable displacement pump-motor type transmission includes: a judging mechanism judging a fact that the discharging amount of any one of the variable displacement pump-motors is zero; and a speed change controller carrying out a control to disable one of the transmission mechanism to transmit the power from the prime mover to the output member by actuating a synchronizer, in case the judging mechanism judges that the discharging amount of the one of the pump-motors functioning to transmit the power from the prime mover to the output member through the one of the transmission mechanism is zero. The control system can carry out a speed change operation of a variable displacement pump-motor type transmission without raising the speed of the prime mover abruptly, by judging a fixed stage set by locking one of the pump-motors.02-04-2010
20100000207Combined Gas and Liquid Pump - The present invention provides a combined gas and liquid pump (01-07-2010
20100293933METHOD FOR AUTOMATICALLY DETERMINING THE CONDITION OF A HYDRAULIC AGGREGATE - A hydraulic aggregate for supplying a hydraulic cylinder in consecutive load strokes is monitored for its working load in order to determine the condition of the aggregate automatically. For this purpose, the time integral of the pressure is determined for each load stroke. The pressure and duration are processed into a characteristic number which indicates the wear. This makes it possible to diagnose the condition of the hydraulic aggregate at any time.11-25-2010
20130145754Pressure Control System for a Hydraulic Lift and Flotation System - A control system is provided to control the rate of pressure rise in a hydraulic lift and flotation system. When a hydraulic cylinder of the hydraulic lift and flotation system is to be adjusted, the pressure in the hydraulic lift and flotation system has to be increased to a predetermined pressure controlled by a relief valve before the hydraulic cylinder can be operated. The unload valve of the hydraulic lift and flotation system can be closed in a controlled or regulated manner in order to control the rate at which pressure rises in the hydraulic lift and flotation system.06-13-2013
20110000203HYDRAULIC SYSTEM HAVING MULTIPLE ACTUATORS AND AN ASSOCIATED CONTROL METHOD - A hydraulic system, and associated method of control, includes an operator input device, a source of hydraulic fluid flow, and a plurality of actuators. At least one valve associated with each actuator for controlling a flow of fluid to and from the actuator. A controller is responsive to a signal from the operator input device to calculate a hydraulic pressure to be supplied to each of the actuators. The controller controls the source of hydraulic fluid flow and the valves for powering the actuators with the calculated hydraulic pressure. The controller also monitors a sensed parameter to determine whether the actuators can be powered with the calculated hydraulic pressure, and in response to a determination that the actuators cannot be powered with the calculated hydraulic pressure, calculates a discrepancy ratio and modifies actuation of the actuators with the discrepancy ratio.01-06-2011
20110000202ACTIVE HYDRAULIC REGENERATION FOR MOTION CONTROL - A hydraulic system including a hydraulic power source (01-06-2011
20100186401METHOD AND HYDRAULIC CONTROL SYSTEM FOR SUPPLYING PRESSURE MEDIUM TO AT LEAST ONE HYDRAULIC CONSUMER - The invention relates to a hydraulic control arrangement and to a method for controlling a hydraulic consumer that comprises a pressure chamber on the input side and on the return side, said pressure chamber being connected to an adjusting pump or a tank via a valve device. The valve device is controlled by means of a control unit via which it can be adjusted in a regeneration mode, in which both pressure chambers are connected to the adjusting pump. According to the invention, the adjusting pump is pressure controlled, whereby in the regeneration mode, it is automatically switched to the normal operation in which the supply side of the pressure chamber is connected to the adjusting pump and the return side of the pressure chamber is connected to the tank when the pumping rate falls below the demand for the pressure medium.07-29-2010
20100180585HYDRAULIC SYSTEM THERMAL CONTRACTION COMPENSATION APPARATUS AND METHOD - An apparatus for compensating for fluid contraction in a hydraulic powered telescoping boom may include a monitor determining the elevation angle of the telescoping boom, a supply of hydraulic fluid, and a fluid control responsive to the monitor. The fluid control provides the hydraulic fluid from the supply to a hydraulic cylinder controlling extension of the telescoping boom when the elevation angle exceeds a predetermined threshold angle to compensate for thermal contraction of hydraulic fluid and thus prevent uncommanded boom retraction. A method in accordance with the invention is also disclosed.07-22-2010
20110107754HYDRAULIC HYBRID TRANSMISSION RETARD DEVICE - A retard device (05-12-2011
20110030359COMPRESSED AIR ENERGY STORAGE SYSTEM UTILIZING TWO-PHASE FLOW TO FACILITATE HEAT EXCHANGE - A compressed-air energy storage system according to embodiments of the present invention comprises a reversible mechanism to compress and expand air, one or more compressed air storage tanks, a control system, one or more heat exchangers, and, in certain embodiments of the invention, a motor-generator. The reversible air compressor-expander uses mechanical power to compress air (when it is acting as a compressor) and converts the energy stored in compressed air to mechanical power (when it is acting as an expander). In certain embodiments, the compressor-expander comprises one or more stages, each stage consisting of pressure vessel (the “pressure cell”) partially filled with water or other liquid. In some embodiments, the pressure vessel communicates with one or more cylinder devices to exchange air and liquid with the cylinder chamber(s) thereof. Suitable valving allows air to enter and leave the pressure cell and cylinder device, if present, under electronic control.02-10-2011
20110079006METHOD AND APPARATUS FOR CONTROLLING A VARIABLE DISPLACEMENT HYDRAULIC PUMP - A control system for a variable displacement hydraulic pump is disclosed. The control system utilizes two flow control valves to provide a flow of hydraulic fluid to two control actuators. The control actuators create opposing moments on the pump swashplate to control swashplate orientation and pump displacement.04-07-2011
20100132350ELECTRIC ACTUATOR - An object of the present invention is to provide an electric actuator having a structure capable of reducing an external force or impact acting on a screw shaft when a piston rod is at a stretched position.06-03-2010
20100132349HYDRAULIC DRIVE, IN PARTICULAR FOR MACHINE TOOLS, AND METHOD FOR CONTROLLING THE HYDRAULIC DRIVE - The invention relates to a hydraulic drive, especially for a press, punching or nibbling machine, 06-03-2010
20110247321DYNAMIC SUPPORT APPARATUS AND SYSTEM - A dynamic support system includes a control system for controlling inflation and deflation of at least one actuator having an inlet connectable to the a control unit of the dynamic support system. The control unit may be in communication with a sensor and may control inflation and deflation of the at least one actuator in response to information provided by the sensor.10-13-2011
20100064674Energy Storage Bridge - The invention is an Energy Storage Bridge (ESB) consisting of air-tight steel pipes, which are used to store the compressed air as stored energy, also used as the load carrying structural elements of the bridge. The stored energy can be the unwanted grid power or the intermittent regenerated energy sources. When the energy is needed, the compressed air is released to convert back to electricity, or to make use of the compressed air to produce hot water during its compression cycle, and cool air at its decompression and expansion cycle when it absorbs heat- an air conditioning technology called Air Cycle Air Conditioning (ACAC) widely used in commercial aircraft. For sea-crossing bridges, because of their great lengths the bridge body volume is enormous, and because of their remoteness from populated areas, they suit well for mass energy storage attached to power plants. With safety measures built in the steel pipes, the ESB can be applied to city road bridges. Since these bridges are not far from populated areas, they can be used as small energy storage units that provide the nearby industrial and commercial complex as well as residential buildings hot water and compressed air for air-conditioning using ACAC technology. The process eliminates the conversion of compressed air back to electricity, but directly uses the compression and decompression cycles to supply hot water and cool air for air-conditioning to the nearby consumers.03-18-2010
20110173963LOW SPEED HYDRAULIC CONTROL FOR FINE CONTROL OF HYDRAULIC CRANES - The present disclosure provides embodiments directed towards a method and a system for fine control of hydraulic cranes. In one embodiment, a system is provided. The system includes a service pack having an engine. The engine has an operating speed ranging from a low speed to a high speed, a hydraulic pump coupled to the engine, wherein the hydraulic pump is configured to supply a hydraulic output to a hydraulic load, and a control system configured to control the hydraulic output. The control system includes a fine control mode configured to lock the engine in the low speed and control the hydraulic output in proportion to a percentage of a trigger activation.07-21-2011
20080236153Method for operating a multiple speed hydraulic motor - A method of operating a hydraulic motor. In one embodiment, the method includes measuring a temperature of hydraulic fluid associated with the hydraulic motor and comparing the measured temperature of the hydraulic fluid to a first temperature threshold. The method also includes controlling an operational state of one or more hydraulic motor functions based at least partially on the comparison of the measured temperature of the hydraulic fluid and the first temperature threshold.10-02-2008
20120198827Hydraulic Drive System - A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator by varying the controlled pressure of one of the machines. The machines are mechanically coupled to permit energy recovery and charge an accumulator to store supplies energy. The drive system may be combined with other services including a transmission for incorporation in a vehicle. The transmission uses a pressure compensated supply and torque control of the wheels.08-09-2012
20110061375Hydraulic Drive System - A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator by varying the controlled pressure of one of the machines. The machines are mechanically coupled to permit energy recovery and charge an accumulator to store supplies energy. The drive system may be combined with other services including a transmission for incorporation in a vehicle. The transmission uses a pressure compensated supply and torque control of the wheels.03-17-2011
20110131964SHAPE MEMORY ALLOY POWERED HYDRAULIC ACCUMULATOR - A system, in certain embodiments, includes an accumulator. The accumulator includes a first cylinder configured to receive a fluid within an internal volume of the first cylinder. The accumulator also includes a piston configured to move axially within the first cylinder. Axial movement of the piston within the first cylinder adjusts the internal volume of the first cylinder. The accumulator further includes a plurality of shape memory alloy wires configured to cause the axial movement of the piston within the first cylinder.06-09-2011
20110056192TECHNIQUE FOR CONTROLLING PUMPS IN A HYDRAULIC SYSTEM - A hydraulic system includes a plurality of pumps that provide pressurized fluid to a plurality of hydraulic actuators some of which work more that others. That system is controlled by producing a usage value for each of the plurality of pumps which indicates an amount that the respective pump has worked. One of the pumps is assigned to each hydraulic actuator in response to the usage values. The pumps with lower usage values are assigned to hydraulic actuators which work more, so as to equalize the use of each pump. The assignment of pumps to hydraulic actuators changes with changes in the usage values for the plurality of pumps. When a given one of the plurality of hydraulic actuators is to operate, hydraulic fluid is routed from the assigned pump to that given one of the plurality of hydraulic actuators.03-10-2011
20100115935Apparatus for generating energy from tides - An apparatus for generating energy during both rising and falling tides, the apparatus comprising a housing defining an enclosure, at least one opening to the enclosure at a bottom portion thereof, and air passageway having a plenum at either end thereof, each plenum having an opening to the enclosure and an opening to the passageway along with a moveable member to close one of the inlet and outlet such that air will pass through a turbine mounted in the air passageway.05-13-2010
20120144816Method for Operating a Pneumatic System and Pneumatic System - Method for operating a pneumatic system comprising at least one pneumatic cylinder, the method comprising: supplying a first gas under pressure to a pneumatic cylinder for a first stroke, wherein the first stroke is a working stroke of said cylinder, and; providing a second gas under pressure, wherein the pressure of the second gas is lower than the pressure of the first gas, wherein providing the second gas comprises providing the first gas from the pneumatic cylinder during a second stroke of said pneumatic cylinder.06-14-2012
20120144815HIGH EFFICIENCY INFINITELY VARIABLE FLUID POWER TRANSFORMER - A high efficiency fluid power transformer is applied generally and particularly to continuous application where efficiency gain is important, that of an underwater wave energy converter, WEC, that reciprocates as recurring waves pass over. Single acting, double acting and helical hydraulic actuators pressurize hydraulic fluid in an energy conversion system. Ultimately, the energy conversion system powers one or more hydraulic motors that drive an electric generator or multiple generators. A sensor system detects characteristics of in-coming waves or alternatively, waves in the process of wave making, such as by detecting changes in pressure as waves pass over the sensor system. The sensors can be mounted on the ocean floor a few wave lengths from the WECs, and a control computer system calculates characteristics of the waves such as wave height and speed data, and uses the data to control aspects of the WECs and components of transformer system.06-14-2012
20090301073APPARATUS AND METHOD FOR ENERGY RECOVERY - An apparatus for energy recovery is provided. The apparatus comprises a hydrostatic machine and at least one hydraulic storage component. The hydraulic storage component is connected to the hydrostatic machine via a working line. A valve device is provided for influencing the volumetric flow in the working line between the hydraulic storage component and the hydrostatic machine. The valve device comprises a brake pressure regulating valve unit with a valve and a pilot valve unit which acts on the valve with a control pressure. The invention also relates to a method for controlling the apparatus for energy recovery. In order to store released energy, a required braking torque is determined by a control electronics system. The volume from the hydrostatic piston machine into the working line is increased and the pilot valve is actuated by the control electronics system such that the valve is moved towards its open position.12-10-2009
20090293468SYSTEM AND METHOD OF CONTROLLING TORQUE OF PLURAL VARIABLE DISPLACEMENT HYDRAULIC PUMPS - A system and method of controlling torque of plural variable displacement hydraulic pumps in construction equipment are provided, which can control torque of the variable displacement hydraulic pumps so that the total amount of torque of the hydraulic pumps does not exceed the preset amount of torque by presetting the torque so that the engine does not stop even at maximum load of the hydraulic pumps or by presetting the speed of the engine or the used torque of the hydraulic pumps in consideration of the fuel economy or working speed. The system includes an engine, at least two variable displacement hydraulic pumps, hydraulic actuators, control levers generating manipulation signals, control lever sensing means detecting the manipulation amounts of the control levers, hydraulic pump pressure sensing means detecting load pressures of the hydraulic pumps, maximum torque setting means setting the total torque inputted to the hydraulic pumps, desired flow rate computing means computing flow rates of the hydraulic pumps, expected torque computing means computing expected torque values of the hydraulic pumps, torque distributing means distributing torque values of the hydraulic pumps, limited flow rate computing means computing the flow rates of the hydraulic pumps, and output means outputting control signals to regulators.12-03-2009
20110185717HYDRAULIC MANIFOLD PUMP - A hydraulic manifold pump comprising a housing in which is located a first hydraulic circuit and a second hydraulic circuit. A bidirectional motor connectable to the first hydraulic circuit and the second hydraulic circuit, the bidirectional motor being able to activate the first hydraulic circuit when operable in a first direction, and being able to activate the second hydraulic circuit when operable in a second direction. The hydraulic manifold pump further compromises a hydraulic actuator having two hydraulic chambers being connectable to the first hydraulic circuit and to the second hydraulic circuit, and both the first and second hydraulic circuits being connected to and able to vent into a fluid reservoir.08-04-2011
20100018194GEAR BOX FOR HYDRAULIC ENERGY RECOVERY - A hydraulic energy recovery and a mechanical drive system in one unit that also provides integral mounting of hydraulic pump/motors for primary drive, secondary drive, and pumps for cooling, lubrication, and low pressure systems along with a mounting position for a power take-off device.01-28-2010
20100162693METHOD OF REDUCING TORQUE RIPPLE IN HYDRAULIC MOTORS - Torque Ripple is reduced in hydraulic system by operating with a hydraulic fluid having a VI of at least 130.07-01-2010
20120096844METHOD AND APPARATUS FOR EXTRACTING ENERGY FROM A FLUCTUATING ENERGY FLOW FROM A RENEWABLE ENERGY SOURCE - A hydraulic pump is driven by a rotating shaft, driven in turn by a renewable energy source. A hydraulic motor drives a load and a high pressure manifold communicates between the pump, motor and an elastically deformable fluid retaining body. The pressure in the high pressure manifold is measured and the net rate of displacement of working fluid by the hydraulic pump is selected responsive thereto to regulate the torque applied to the rotating shaft. The net rate of displacement of working fluid by the hydraulic motor is selected to smooth the energy flow to the load. The net rate of displacement of working fluid by the hydraulic motor is selected to regulate the pressure in the high pressure manifold to remain within an acceptable pressure range.04-26-2012
20110072809HYDRAULIC SYSTEM AND METHOD FOR CONTROL - A hydraulic system is disclosed having at least two hydraulic circuits. The disclosed system apportions flow between the two hydraulic circuits based on an assumed flow rate that is held constant in both power-limited and non-power-limited conditions.03-31-2011
20120031086SYSTEMS AND METHODS FOR SELECTIVELY DISENGAGING A CLUTCH TO PROTECT ENGINES FROM DAMAGE - Embodiments of the present invention are generally related to methods and devices for use with vehicles that include a clutch, a transmission, a slave cylinder, a master cylinder and an engine. In accordance with an embodiment, a device includes a primary piston configured to urge hydraulic fluid into a slave cylinder, when the primary piston is moved from a first position to a second position, to thereby disengage the clutch from the transmission. The primary piston is normally movable from the first position to the second position by hydraulic actuation of a master cylinder. A secondary piston is configured to selectively apply force to the primary piston, to move the primary piston from the first position to the second position, when the secondary piston is selectively actuated. The secondary piston can be selectively actuated by a secondary fluid, such as a compressed gas. Methods and devices are used to selectively disengage the clutch from the transmission when an operating condition that can be damaging to the engine is detected.02-09-2012
20120304631HYDRAULIC FLUID SYSTEM - A hydraulic fluid system for a mobile machine includes a closed loop hydraulic fan circuit. The hydraulic fan circuit includes a primary pump, a motor fluidly connected to the primary pump, and a fan driven by the motor. The hydraulic fan circuit also includes a supply passage extending from the primary pump to the motor, a return passage extending from the motor to the primary pump, and a first accumulator selectively fluidly connected to at least one of the supply and return passages via a charge valve. The hydraulic fluid system also includes at least one open loop hydraulic circuit fluidly connected to the first accumulator.12-06-2012
20100319335HYDRAULIC SYSTEM - The present invention relates to a hydraulic system with a feed pump for feeding hydraulic fluid, wherein the feed pump is driven by a hydraulic drive motor. The invention furthermore comprises a method for feeding hydraulic fluid into a hydraulic system via a feed pump, wherein the feed pump is driven by a hydraulic drive motor.12-23-2010
20120204549CONDITIONAL LOAD SENSE CONTROL - A method of controlling a hydraulic circuit having a pump, a hydraulic actuator, and a control valve disposed between the pump and hydraulic actuator is disclosed. The method includes selectively placing the hydraulic circuit between a work mode and a work standby mode based upon the relationship between the hydraulic actuator hydraulic pressure and at least one maximum pressure limit value. The work mode includes moving the control valve to an open position such that the pump and hydraulic actuator are in fluid communication with each other and commanding the pump to generate an output pressure value that is greater than the measured hydraulic actuator hydraulic pressure. The work standby mode includes moving the control valve to a closed position such that the pump is isolated from the hydraulic actuator and commanding the pump to generate an output pressure value that is independent of the measured hydraulic actuator hydraulic pressure.08-16-2012
20120055146Drive train device - In a drive train device, in particular a motor vehicle drive train device, with a working fluid pressure system for providing an operating fluid pressure including at least a first and a second operating fluid pressure source connected in at least one operating state directly to the working fluid pressure system, and a lubricating and cooling fluid pressure system with an operating fluid pressure deviating from the operating fluid pressure in the working fluid pressure system, a hydraulic switching unit is provided which in at least one operating state connects the second operating fluid pressure source directly to the lubricating and cooling fluid pressure system for increasing the pressure thereof.03-08-2012
20120006013HIGH-EFFICIENCY ENERGY-CONVERSION BASED ON FLUID EXPANSION AND COMPRESSION - In various embodiments, motor-pump efficiency is increased by limiting the fluid pressure communicated to the motor-pump to a range smaller than that communicated by other components of an energy storage and/or recovery system.01-12-2012
20080295503Method for using the expanion of hydrogen and oxygen gases during Electrolysis to produce electricity by means of turning small DC generators - The present invention provides a method for making the production of hydrogen during electrolysis more efficient. By using the expansion of hydrogen and oxygen during electrolysis to produce electricity by turning air pressure wheels attached to DC generators, allows us to harvest the pressure the gases make in their sealed sections of the apparatus. By using the rising of the gas bubbles in the electrolytic solution to turn several small wheel attached to small DC generators, allows us to harvest power from their motion to the top of the apparatus. This invention does not alter the oxygen gas or hydrogen gas in any way, allowing both gases to be used or stored in their pure form. The energy gained by this method is directed back to the DC power source and makes the production of hydrogen and water more efficient by replacing electrical energy lost in the form of heat during electrolysis.12-04-2008
20120204548Cold Start Valve - Parasitic hydraulic loading on an engine is significantly reduced during cold starts by using an unloader valve to divert the flow of hydraulic fluid from a hydraulic pump to a hydraulic actuator, i.e., load source, recirculating the hydraulic fluid between the hydraulic pump and the unloader valve.08-16-2012
20120055145SYSTEMS AND METHODS FOR OPTIMIZING THERMAL EFFICIENCEY OF A COMPRESSED AIR ENERGY STORAGE SYSTEM - Systems, methods and devices for optimizing thermal efficiency within a gas compression system are described herein. In some embodiments, a device can include a first hydraulic cylinder, a second hydraulic cylinder, and a hydraulic actuator. The first hydraulic cylinder has a first working piston disposed therein for reciprocating movement in the first hydraulic cylinder and which divides the first hydraulic cylinder into a first hydraulic chamber and a second hydraulic chamber. The second hydraulic cylinder has a second working piston disposed therein for reciprocating movement in the second hydraulic cylinder and which divides the second hydraulic cylinder into a third hydraulic chamber and a fourth hydraulic chamber. The hydraulic actuator can be coupled to the first or second working piston, and is operable to move the first and second working pistons in a first direction and a second direction such that volume in the hydraulic chambers are reduced accordingly.03-08-2012
20120055144METHOD FOR OPERATING A HYDRAULIC HYBRID VEHICLE - The invention relates to a method for operating a hydraulic hybrid vehicle (03-08-2012
20110094213METHOD AND APPARATUS FOR CONTROLLING A PUMP - An electro-hydraulic control system for pump control is disclosed. The hydraulic actuator is configured to control the inclination of a swashplate. The position of the hydraulic actuator is controlled by controlling the flow of pressurized fluid into and out of two pressure chambers, one on either side of the actuator. A fluid passageway is provided that selectively connects the passageway to tank. The passageway has an orifice for each pressure chamber, and the actuator is configured to selectively block all or a portion of one or more of the orifices, depending on the position of the actuator. The components of the control system are configured such that the actuator will return to a neutral or near-neutral position upon loss of electric power.04-28-2011
20110094212COMPRESSED AIR ENERGY STORAGE SYSTEM WITH REVERSIBLE COMPRESSOR-EXPANDER UNIT - A system and method for compressing and expanding air in a compressed air energy storage (CAES) system is disclosed. A CAES system is provided that is alternately operable in a compression mode and an expansion mode and includes therein a motor-generator unit and a drive shaft connected to the motor-generator unit that is configured to transmit rotational power to and from the motor-generator unit. The CAES system also includes at least one reversible compressor-expander unit coupled to the drive shaft and configured to selectively compress and expand air, and an air storage unit connected to the reversible compressor-expander unit and configured to store compressed air received therefrom, with the at least one reversible compressor-expander unit compressing air during the compression mode and expanding air during the expansion mode.04-28-2011
20120151905Control Apparatus and Method for a Hydrostatically Actuated Vehicle - A method and apparatus for controlling operation of an engine in a hydrostatically driven vehicle having high and economy modes may include monitoring one or more control inputs. When in the economy mode the engine may be operated: at a fixed propel neutral speed when a propel control input is in a neutral position; at a fixed propel drive speed when the propel control input is in a drive position and a propel pump displacement signal is less than a maximum displacement position of a propel pump; and at a variable drive speed when the propel control input is in the drive position and the propel pump displacement signal indicates a maximum displacement position. The economy mode conserves fuel while ensuring that sufficient engine power is maintained to operate the propel and any implement pumps provided on the vehicle.06-21-2012
20120151906SYSTEM FOR CONTROLLING TORQUE CONVERTER TEMPERATURE DURING TORQUE CONVERTER STALL CONDITIONS - A method and system are provided for controlling the operating temperature of a torque converter during torque converter stall conditions. The torque converter has a pump rotatably driven by an internal combustion engine and a rotatable turbine fluidly coupled to the pump. The system first determines whether the torque converter is currently in a torque converter stall condition, and, if so, determines a slip speed as a difference in rotational speeds between the pump and the turbine, determines an engine output torque limit as a function of the slip speed and a desired slip speed, and controls the operating temperature of the torque converter by limiting output torque produced by the engine based on the engine output torque limit.06-21-2012
20120151904HYDRAULIC CONTROL SYSTEM HAVING ENERGY RECOVERY - A hydraulic control system for a machine is disclosed. The hydraulic control system may have a tank, a pump configured to draw fluid from the tank and pressurize the fluid, a swing motor configured to receive the pressurized fluid and swing a body of the machine relative to an undercarriage, and a tool actuator configured to receive the pressurized fluid and move a tool relative to the body. The hydraulic control system may also have an energy recovery device configured to convert hydraulic energy to mechanical energy, a first accumulator configured to store waste fluid received from the swing motor, and a second accumulator configured to store waste fluid received from the tool actuator. Stored waste fluid from at least one of the first and second accumulators may be selectively discharged into the energy recovery device.06-21-2012
20120102935SYSTEMS, METHODS AND DEVICES FOR THE MANAGEMENT OF HEAT REMOVAL WITHIN A COMPRESSION AND/OR EXPANSION DEVICE OR SYSTEM - Systems, methods and devices for optimizing heat transfer within a device or system used to compress and/or expand a gas, such as air, are described herein. In some embodiments, a compressed air device and/or system can include an actuator such as a hydraulic actuator that can be used to compress a gas within a pressure vessel. An actuator can be actuated to move a liquid into a pressure vessel such that the liquid compresses gas within the pressure vessel. In such a compressor/expander device or system, during the compression and/or expansion process, heat can be transferred to the liquid used to compress the air. The compressor/expander device or system can include a liquid purge system that can be used to remove at least a portion of the liquid to which the heat energy has been transferred such that the liquid can be cooled and then recycled within the system.05-03-2012
20090133394Method for Controlling or Regulating the Air Pressure in a Compressed Air Supply Device - A method is provided for controlling and/or regulating the air pressure in a compressed air supply device for a utility vehicle. At least one pressure value in the compressed air supply device and/or in vehicle components connected to the compressed air supply device is recorded. A humidity value representing the humidity content in an air filter unit associated with the compressed air supply device is determined. A clutch connecting a drive to a compressor is opened. A discharge valve of the compressed air supply device is opened when the pressure value is above a predetermined minimum value and the humidity value exceeds a predetermined threshold value. The clutch is opened and the discharge valve remains closed when it is indicated that the clutch can be engaged, the pressure value reaches a predetermined cutting-off pressure, and the humidity value is below the predetermined threshold value.05-28-2009
20120117958METHOD AND APPARATUS FOR EXTRACTING ENERGY FROM A FLUCTUATING ENERGY FLOW FROM A RENEWABLE ENERGY SOURCE - In an energy extraction device and method for extracting energy from a fluctuating energy flow from a renewable energy source, a hydraulic pump is driven by a rotating shaft, driven in turn by a renewable energy source. A hydraulic motor drives a load and a high pressure manifold communicates between the pump, motor and an elastically deformable fluid retaining body. The hydraulic pump and hydraulic motor comprise working chambers displacing a volume of working fluid selectable on each cycle of working chamber volume by the control of electronic valves. The pressure in the high pressure manifold is measured and the net rate of displacement of working fluid by the hydraulic pump is selected responsive thereto to regulate the torque applied to the said rotating shaft.05-17-2012
20120159939ELECTRIC PUMP - A system for lubricating transmission components with hydraulic fluid includes a pump and a motor coupled to the pump. The pump has an inlet port that receives hydraulic fluid and an outlet port from which hydraulic fluid is pumped to the transmission components. A pump pressure is regulated by adjusting a motor torque of the motor, and the motor torque is set by commands based on a look-up table or a formula.06-28-2012
20110179781HYDRAULIC DRIVE SYSTEM FOR USE IN DRIVEN SYSTEMS - A hydraulic drive system for use in driving a power generator has a hydraulic pump having an input for rotationally driving the hydraulic pump, a flow control valve in fluid communication with the hydraulic pump, a hydraulic motor having a first output and a second output coupled to a hydraulic fluid source, and a pressure regulator positioned intermediate the flow control valve and the hydraulic motor. The pressure regulator is in fluid communication with the hydraulic motor and the flow control valve, and maintains a hydraulic pressure at its input that is higher than at its output to prevent the hydraulic system from stalling. The system further comprises a power generator having an input shaft rotationally coupled to the hydraulic motor first output.07-28-2011
20120210705SYSTEMS AND METHODS FOR REDUCING DEAD VOLUME IN COMPRESSED-GAS ENERGY STORAGE SYSTEMS - In various embodiments, dead space and associated coupling losses are reduced in energy storage and recovery systems employing compressed air.08-23-2012
20120167559ADSORPTION-ENHANCED COMPRESSED AIR ENERGY STORAGE - In an embodiment of the present disclosure, an energy storage device is presented. The energy storage device includes a porous material that adsorbs air and a compressor. The compressor converts mechanical energy into pressurized air and heat, and the pressurized air is cooled and adsorbed by the porous material. The energy storage device also includes a tank used to store the pressurized and adsorbed air and a motor. The motor is driven to recover the energy stored as compressed and adsorbed air by allowing the air to desorb and expand while driving the motor.07-05-2012
20100050620Control system and method for braking a hydrostatic drive machine - A method of braking a hydrostatic drive machine includes steps of reducing a displacement of a pump of a hydrostatic drive system to a non-zero displacement, and increasing a displacement of a motor of the hydrostatic drive system to a displacement that is less than a maximum displacement. The method also includes a step of accelerating an engine of the hydrostatic drive system toward a desired engine speed range.03-04-2010
20120312004EMISSION-FREE DEVICES AND METHOD FOR PERFORMING MECHANICAL WORK AND FOR GENERATING ELECTRICAL AND THERMAL ENERGY12-13-2012
20120312003METHOD FOR ACTUATING A HYDRAULICALLY MOVABLE WORKING ELEMENT OF A WORKING EQUIPMENT, AND A WORKING EQUIPMENT - The invention relates to a method and to a working equipment for actuating a hydraulically movable working element (12-13-2012
20100326066COMPRESSED AIR ENERGY STORAGE SYSTEM UTILIZING TWO-PHASE FLOW TO FACILITATE HEAT EXCHANGE - A compressed-air energy storage system according to embodiments of the present invention comprises a reversible mechanism to compress and expand air, one or more compressed air storage tanks, a control system, one or more heat exchangers, and, in certain embodiments of the invention, a motor-generator. The reversible air compressor-expander uses mechanical power to compress air (when it is acting as a compressor) and converts the energy stored in compressed air to mechanical power (when it is acting as an expander). In certain embodiments, the compressor-expander comprises one or more stages, each stage consisting of pressure vessel (the “pressure cell”) partially filled with water or other liquid. In some embodiments, the pressure vessel communicates with one or more cylinder devices to exchange air and liquid with the cylinder chamber(s) thereof. Suitable valving allows air to enter and leave the pressure cell and cylinder device, if present, under electronic control.12-30-2010
20100326065HYDRAULIC POWER TRANSMISSION SYSTEM FOR A MINERAL MATERIAL PROCESSING PLANT, A METHOD FOR CONTROLLING THE SAME, A SCREENING MACHINE AND A CRUSHING MACHINE - Hydraulic transmission system for a mineral material processing plant, which transmission system comprises at least two hydraulic first motors, which are arranged to drive at least one conveyor belonging to the mineral material processing plant, at least two first directional valves connected via the first actuator channels of the directional valves to each of the first motors, a hydraulic pump arranged to transfer hydraulic fluid via the first actuator channels of the directional valves to the first motors. The system also comprises pressure sensors. The first directional valves are valves that can be adjusted by external control during the running of the processing plant and which are arranged to control the volume flow of the hydraulic fluid supplied into the first motors. The control is made on the basis of the pressure of hydraulic fluid measured by pressure sensors in the first actuator channels the directional valves.12-30-2010
20100326064COMPRESSED AIR ENERGY STORAGE SYSTEM UTILIZING TWO-PHASE FLOW TO FACILITATE HEAT EXCHANGE - A compressed-air energy storage system according to embodiments of the present invention comprises a reversible mechanism to compress and expand air, one or more compressed air storage tanks, a control system, one or more heat exchangers, and, in certain embodiments of the invention, a motor-generator. The reversible air compressor-expander uses mechanical power to compress air (when it is acting as a compressor) and converts the energy stored in compressed air to mechanical power (when it is acting as an expander). In certain embodiments, the compressor-expander comprises one or more stages, each stage consisting of pressure vessel (the “pressure cell”) partially filled with water or other liquid. In some embodiments, the pressure vessel communicates with one or more cylinder devices to exchange air and liquid with the cylinder chamber(s) thereof. Suitable valving allows air to enter and leave the pressure cell and cylinder device, if present, under electronic control.12-30-2010
20100326063METHODS AND APPARATUS TO CHARGE ACCUMULATOR APPARATUS - Methods and apparatus to charge accumulators are described. An example system to charge an accumulator apparatus includes a piston disposed within a housing to define a first chamber adjacent a first side of the piston and a second chamber adjacent a second side of the piston. A fill probe having a body and a passageway between a first end of the fill probe and a second end of the fill probe removably couples to the piston to fluidly couple to the passageway of the fill probe to the second chamber of the housing when the accumulator is in a charging condition. A valve is fluidly coupled to the piston to enable fluid flow to the second chamber of the housing via the piston when the fill probe is coupled to the piston.12-30-2010
20110120107ENERGY STORAGE SYSTEM INCLUDING PRESSURIZED RESERVOIR - An energy storage system includes a reservoir defining an interior chamber, a collapsible bladder positioned within the interior chamber and having working fluid therein, a one-way valve in fluid communication with the interior chamber and operable to permit entry of replacement air into the interior chamber as working fluid exits the bladder, a reversible pump/motor in fluid communication with the bladder, and an accumulator containing working fluid and gas. The accumulator is in selective fluid communication with the reversible pump/motor to deliver pressurized working fluid to the reversible pump/motor when operating as a motor, and to receive pressurized working fluid discharged by the reversible pump/motor when operating as a pump.05-26-2011
20120260643VELOCITY CONTROL FOR HYDRAULIC CONTROL SYSTEM - A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator. The capacity of one of the machines is limited in a motoring mode to determine a maximum rate of efflux from one of the chambers. The pressure of fluid supplied to the other of said chambers is maintained at a predetermined level to provide motive force. The machines are mechanically coupled to permit energy recovery and charge an accumulator to store surplus energy.10-18-2012
20120260642Load holding for meterless control of actuators - First and second mechanical hydraulic valves are disposed between a pump and the cap side chamber of an actuator and the pump and the rod chamber of the pump. The first and second valves are actuated as a result of respective pressure differentials applied across the valves. A controller controls flow from a pump in response to a commanded motion to control movement of the actuator, and cause the valves to open. The valves are disposed in their no-flow positions when the pump is not operative, and when the hydraulic system of off or locked out to hold a load.10-18-2012
20120260641Overrunning pump protection for flow-controlled actuators - A hydraulic system includes an actuator, a pump, rod side and cap side fluid connections between the pump and the rod and cap side chambers, respectively, at least one selectively actuatable regeneration valve that selectively provides flow from the cap side fluid connection to the rod side fluid connection, and a controller. The controller controls the pump to selectively vary the flow rate of the pump in response to a commanded motion to control movement of the piston. The controller actuates the regeneration valve during a retraction of the piston into the cylinder when pump is acting as a motor.10-18-2012
20120297758Large Displacement Variator - A large displacement hydrostatic variator is disclosed which includes an input shaft coupled to at least first and second hydrostatic pumps. Two hydrostatic pumps are utilized instead of one larger hydrostatic pump because it has been found the two smaller hydrostatic pumps can operate at a faster speed than a larger hydrostatic pump with a displacement equivalent to that of the two smaller hydrostatic pumps. Each hydrostatic pump may include a carrier that includes a plurality of recesses. The recesses may serve as cylinders for slidably accommodating a piston in each piston of each pump may be pivotally coupled to an adjustable swash plate. A hydrostatic motor may be coupled to an output shaft. The motor includes a carrier that also includes a plurality of recesses that may also serve as cylinders for each slidably accommodating a piston. Each piston of the motor may be coupled to a swash plate. The adjustable swash plate of each pump may be coupled to an actuator, which may be controlled by a single controller.11-29-2012
20110209469SYSTEM AND METHOD TO RECAPTURE ENERGY OF A HYDRAULIC MOTOR - A system and method to recapture energy of a hydraulic motor is disclosed. The system includes a plurality of pistons disposed about a periphery of a flywheel, wherein each piston is compressed by a roller during each revolution of the flywheel. As each piston is engaged and pushes against the roller, the piston is biased inward and forces hydraulic fluid out of the cylinder recapturing energy as pressure to the system when the flywheel is rotating under its own rotational inertia. In addition, the piston pushing against the roller causes the flywheel to continue to rotate. As the force acting on the piston causes the flywheel to rotate, the next piston starts to approach the position of the prior piston. This action continues as long as the fluid is under pressure when it enters each cylinder.09-01-2011
20130180235Elastic Hydraulic Accumulator/Reservoir System - The invention is a combination accumulator and reservoir which stores energy when the accumulator deforms from its original shape in response to the flow of a pressurized fluid from the reservoir. The stored energy is returned when the fluid flow is reversed and the accumulator discharges the fluid and returns to its original shape. At least one part of the novelty of the invention is that the accumulator and the fluid reservoir reside in the same housing such that the volume of each varies inversely. Accordingly, the invention is more compact and weighs less than conventional accumulators. Another feature of the invention is that fluid is located around the bladder accumulator to lubricate contact between the bladder and sides of the reservoir.07-18-2013
20120317964Hydrostatic Circuits with Variable Charge and Variable Flushing Systems - A closed hydrostatic circuit with variable charge and variable flushing systems is disclosed. A variable displacement charge pump is configured to supply charge fluid and pilot control fluid to the hydrostatic circuit. An electronically controlled pressure regulating valve is in communication with an output of the charge pump and is linked to a controller. When the hydrostatic control system detects a high hydraulic temperature condition, the electronically controlled pressure regulating valve, that is in communication with an output of the charge pump and that is linked to a controller, increases the charge pump flow. A bidirectional variable displacement hydrostatic motor is connected in parallel to two input/output lines. A flush valve is in communication with the hydrostatic motor and both input/output lines. The flush valve and hydrostatic motor are both in communication with the flush orifice and a flush relief valve. When the pressure regulating valve causes the charge pump to operate at or near a full capacity, fluid exits the flush valve and passes through both the flush orifice and the flush relief valve. In contrast, when the pressure regulating valve causes the charge pump to operate at a lower or near minimum capacity, fluid exits the flush valve and passes through the flush orifice only without passing through the flush relief valve.12-20-2012
20120317965AUTOMATED HYDRAULIC POWER SYSTEM AND A METHOD OF OPERATING AN AUTOMATED HYDRAULIC POWER SYSTEM - The present a hydraulic system and a method for operating a hydraulic system that includes an engine, at least one hydraulic pump, a pump box interposed between the engine and the at least one hydraulic pump, at least one hydraulic clutch pack interposed between the pump box and the at least one hydraulic pump, at least one valve, a hydraulic fluid reservoir, a clutch actuation pump, and one or more electronics. The at least one hydraulic clutch pack selectively transmits torque to the at least one hydraulic pump. The at least one valve may be opened to supply pressurized hydraulic fluid to the at least one clutch pack and may be closed to interrupt a supply of pressurized hydraulic fluid to the at least one clutch pack in order to selectively engage or disengage the clutch pack.12-20-2012
20120324875OPTIMIZED SYSTEM RESPONSE WITH MULTIPLE COMMANDS - A method and system for operating a machine having first and second movable elements, first and second hydromechanical movers for moving the first and second movable elements, respectively, and first and second hydraulic pumps linked to the first and second hydromechanical movers, respectively. Movement requests for moving the first and second movable elements are processed such that the movement command to the second hydromechanical mover is reduced by a variable amount based on the magnitude of the first movement request. For commanded first hydromechanical mover movements below a certain level, flow to the second hydromechanical mover may optionally not be reduced.12-27-2012
20120324877SYSTEM FOR DRIVING A BOOM OF A HYBRID EXCAVATOR AND A CONTROL METHOD THEREOF - Disclosed are a system for driving a boom of a hybrid excavator, and a method for controlling same. The disclosed system comprises: an electric motor operating by means of a motor or generator; a capacitor for storing electricity generated by the electric motor; a hydraulic pump motor driven by the electric motor to supply working oil to a boom; a boom control valve having a closed circuit for selectively connecting/disconnecting a discharge line and an inlet line of the hydraulic pump motor to/from a head or a load of the boom; a main pump driven by a driving source arranged separately from the motor so as to supply working oil to a bucket, driving motor, or arm; a boom-assisting valve, which connects a discharge line of the main pump to the discharge line of the hydraulic pump motor, such that working oil discharged from the main pump and the hydraulic pump motor can be combined; and a control unit for controlling the electric motor, the hydraulic pump motor, and the boom control valve. The system of the present disclosure minimizes the loss of energy during excavation, which is the main use of an excavator, while using the electric motor, ensures the operating performance of the boom, and recovers regenerative energy from the boom.12-27-2012
20120324873AUTOMATIC TRANSMISSION HYDRAULIC ACCUMULATOR - A hydraulic accumulator system for providing pressurized oil to a transmission in a vehicle. The system includes a transmission oil storage chamber to store oil at a predetermined level; and a hydraulic accumulator mounted in the oil storage chamber and including an accumulator piston mounted below the level of oil, separating an accumulator oil area from a remainder of the oil storage area and movable to increase and decrease the oil in the accumulator oil area, and a spring biasing the piston toward the accumulator oil area. The system also has a hydraulic assembly including a first oil passage for removing the oil from the remainder of the oil storage area, a second oil passage for directing oil into and out of the accumulator oil area below the predetermined oil level and a hydraulic circuit directing the oil from the first oil passage into the second oil passage.12-27-2012
20120324874INDEPENDENT SUPPLY AND EXHAUST METERING WITHIN A VALVE CASTING - The present disclosure provides a hydraulic system for controlling a load. The system includes a housing defining an inlet, a first port, and a second port. The system further includes a spool valve and a proportional control element. The spool valve is in fluid communication with the inlet and the second port and the proportional control element is in fluid communication with the first port. The proportional control element can be controllable to exhaust fluid from the first port to a reservoir. In this arrangement, the proportional control element and the spool valve are controlled independently of one another.12-27-2012
20120324879Hydraulic Hybrid Vehicle with Safe and Efficient Hydrostatic Operation - A shut off valve is configured to shut off flow from the high pressure fluid line to the high pressure accumulator in a series hydraulic hybrid vehicle in order to quickly raise system pressure in the high pressure fluid line and enable additional torque output from the hydraulic motor for vehicle propulsion. A pressure relief valve is further provided to vent excess flow from the high pressure line to the high pressure accumulator as needed to avoid exceeding a maximum desired system pressure in the high pressure fluid line, thereby providing for safe and efficient hydrostatic operation in the vehicle.12-27-2012
20120324878Hydraulic Drive System And Diagnostic Control Strategy For Improved Operation - A method and apparatus are provided for hydraulic fluid supply between a hydraulic pump and a hydraulic drive unit, switching hydraulic fluid flow direction to the hydraulic drive unit or stopping hydraulic fluid flow to the hydraulic drive unit when measured hydraulic fluid pressure crosses a predetermined pressure threshold value. The method further comprises calculating an amount of mechanical work done by the hydraulic drive unit and warning an operator or limiting hydraulic fluid flow rate to the hydraulic drive unit when the calculated mechanical work for the drive cycle is less than an expected amount of mechanical work. The apparatus for practicing the method further includes a pressure sensor associated with a hydraulic fluid supply conduit between the pump and the drive unit, and an electronic controller programmed to operate the drive system according to the method.12-27-2012
20120090308HYBRID HYDRAULIC SYSTEMS FOR INDUSTRIAL PROCESSES - A hydraulic drive system for driving a load includes a drive shaft; first and second hydraulic pumps driven by the drive shaft, and a control system that operates the hydraulic drive system in a plurality of modes including: a) a first mode where the second hydraulic pump pumps hydraulic fluid from a supply line to an accumulator; b) a second mode where the second hydraulic pump pumps hydraulic fluid from the accumulator to the supply line; c) a third mode where the second hydraulic pump pumps hydraulic fluid from the supply line to a reservoir; and d) a fourth mode where the second hydraulic pump pumps hydraulic fluid from the reservoir to the supply line. At least the second hydraulic pump is a variable displacement bidirectional pump.04-19-2012
20120090307ELECTRIC CIRCUIT WITH SPEED CONTROL AND DIODE SEPARATION FOR USE WITH AN ELECTRICALLY ACTUATABLE MECHANISM - An electric circuit with speed control and diode separation for use with an electrically actuatable mechanism. An operator input provides a signal to a controller of the electric circuit. The controller causes a MOSFET relay to provide a voltage to the electrically actuatable mechanism. The relay is adapted to vary the voltage in response to pulse width modified signals from the controller.04-19-2012
20120324876SUBSEA ACCUMULATOR SYSTEM - Embodiments of a subsea accumulator system are disclosed. The system includes a subsea skid structure, a pre-charged fluid accumulator mounted in the subsea skid structure and fluidly coupled to a flowline in the skid structure, and a subsea device coupled to the flowline to receive hydraulic fluid power from the pre-charged fluid accumulator. The system may include a fill port having a releasable connection to selectively couple with a hydraulic fluid supply separate from the skid structure. Certain embodiments may include a subsea pump, instead of a pre-charge, for delivering pressurized fluid to a piston in the accumulator, and multiple accumulators for mixing fluids or discharging the fluids sequentially.12-27-2012
20120285155COOLING SYSTEM FOR GEROTOR MOTOR - A hydraulic motor having a cooling system includes a stator, a rotor that rotates and orbits in the stator, a drive link connected to the rotor, and a housing connected with the stator. The housing includes a working fluid inlet port, a working fluid outlet port, a cooling fluid inlet port, and a cooling fluid outlet port. Each port extends through the housing and is configured to connect with a different associated external fluid line. Pressurized fluid enters the working fluid inlet port to rotate and orbit the rotor en route to the working fluid outlet port. The cooling fluid ports are isolated from the working fluid inlet port and the working fluid outlet port within the housing.11-15-2012
20120285153Drive System for Electric Vehicles - A system includes a high pressure accumulator; a low pressure reservoir; and a plurality of pumps configured to control the flow of fluid between the high pressure accumulator and the low pressure reservoir, a battery; an electric motor powered by the battery; a management unit in communication with the electric motor and the plurality of pumps.11-15-2012
20120285154EFFICIENCY OF LIQUID HEAT EXCHANGE IN COMPRESSED-GAS ENERGY STORAGE SYSTEMS - In various embodiments, efficiency of energy storage and recovery systems employing compressed air and liquid heat exchange is improved via control of the system operation and/or the properties of the heat-exchange liquid.11-15-2012
20100199653HYDRAULIC SYSTEM FOR SYNCHRONIZING A PLURALITY OF PISTONS AND AN ASSOCIATED METHOD - A hydraulic system for use with a pressurized fluid includes a first cylinder and a second cylinder. A flow path links the first and second cylinders in fluid communication with each other. A first piston is disposed within the first cylinder and defines a first axis and a second piston disposed within the second cylinder. The first piston is movable along the first axis between a variety of operating positions and a rephasing position. The first piston has an exterior surface that defines a peripheral groove and several flutes. The flutes are oriented such that they are parallel to the first axis and intersect the peripheral groove, allowing the fluid to flow from the first cylinder across the flow path and into the second cylinder when the first piston is in the rephasing position thereby automatically rephasing the first and second pistons within the hydraulic system.08-12-2010
20120137668INCREASED POWER IN COMPRESSED-GAS ENERGY STORAGE AND RECOVERY - In various embodiments, energy is stored or recovered via super-atmospheric compression and/or expansion of gas in conjunction with substantially adiabatic compression and/or expansion from or to atmospheric pressure.06-07-2012
20130008153TOOL COUPLER ASSEMBLY - A tool coupler assembly for a machine is disclosed. The tool coupler assembly may have a coupler frame, a first latch, a second latch, and a hydraulic actuator connected to move the second latch relative to the first latch and the coupler frame. The hydraulic actuator may have a first chamber, a second chamber, and a pressure valve with a check element movable to allow a flow of fluid into the first chamber based on a pressure of fluid in the first chamber, and a pressure regulating element movable to allow a flow of fluid out of the first chamber based on a pressure of fluid in the second chamber. The tool coupler assembly may additionally have a first pilot passage configured to communicate fluid from the second chamber with the pressure-regulating element, and a second pilot passage configured to communicate fluid from the first chamber with the pressure-regulating element.01-10-2013
20130008152ENERGY STORAGE SYSTEM FOR A HYBRID VEHICLE - An energy storage system, for a hybrid vehicle including an internal combustion engine having an output shaft and a transmission operably coupled to the output shaft, includes a reservoir containing working fluid, a reversible pump/motor in fluid communication with the reservoir, a first clutch selectively drivably coupling the output shaft of the engine and the reversible pump/motor, a second clutch selectively drivably coupling an output shaft of the transmission and the reversible pump/motor, and an accumulator containing working fluid and gas. The accumulator is in fluid communication with the reversible pump/motor to deliver pressurized working fluid to the reversible pump/motor when operating as a motor to drive one of the respective output shafts of the engine and the transmission, and to receive pressurized working fluid discharged by the reversible pump/motor when operating as a pump driven by the one of the respective output shafts of the engine and the transmission.01-10-2013
20130014498Variable Displacement Hydraulic Pump ControlAANM Kinch; DerekAACI YpsilantiAAST MIAACO USAAGP Kinch; Derek Ypsilanti MI USAANM Dobson; Mark R.AACI HowellAAST MIAACO USAAGP Dobson; Mark R. Howell MI USAANM Pekarsky; LevAACI W. BloomfieldAAST MIAACO USAAGP Pekarsky; Lev W. Bloomfield MI USAANM Mahapatro; HrudayaAACI CantonAAST MIAACO USAAGP Mahapatro; Hrudaya Canton MI US - A system controlling pressure in a transmission including a variable displacement pump, a circuit carrying fluid from the pump to the transmission, a valve using fluid in said circuit to regulate pressure that controls displacement of the pump, a source of control pressure including an accumulator, a first spring acting with said source causing the valve to change the regulated pressure, and a second spring acting with feedback pressure from said circuit to oppose said change.01-17-2013
20130014499Methods for Safe Operation of Hydraulic Hybrid Vehicles with Over-Center Pump/Motors - Fail-safe methods for utilizing an over-center pump/motor in a hydraulic hybrid vehicle are disclosed. A high-pressure fluid shutoff valve and an optional electrically or manually operated valve are additionally provided as means to ensure disconnection of the high pressure source in the event of a failure. Displacement stroke position and pressure differentials across the pump/motor are continually monitored. On detection of various modes of failure or irregularity in control of displacement, actions are taken including any of: the high pressure and low pressure accumulators are shut off automatically or manually, a check valve between the high and low pressure ports of the pump/motor is activated, and a small amount of pressurized fluid is released from the high pressure circuit to depressurize the captive fluid. Safe startup and shutdown procedures are also specified. The system provides for safe operation of a hydraulic hybrid vehicle that includes an engine pump and drive motor, at least one of which operates over-center. The system optionally provides a displacement control valve that is controlled by feedback from an actuator or displacement position sensor and that on loss of electric power to the displacement control valve will cause the controlled pump/motor to stroke to a zero displacement position.01-17-2013
20120240565SHIFT CYLINDER, DRIVE DEVICE, WORK MACHINE AS WELL AS METHOD FOR OPERATING A WORK MACHINE - The invention relates to a shift cylinder including a cylinder element having a working space, a first and a second piston received in the working space displaceably relatively to it, by which the working space is divided in a first working chamber capable of being charged with a working medium through a first port of the shift cylinder, a second working chamber capable of being charged with a working medium through a second port of the shift cylinder and a third working chamber disposed between the first and the second working chamber, including at least one spring member capable of being supported on the first piston on the one hand and on the second piston on the other hand.09-27-2012
20120240564ACCUMULATOR ASSISTED HYDROSTATIC DRIVELINE AND OPTIMIZATION METHOD THEREOF - A hydrostatic driveline for a vehicle, a method for minimizing a fuel consumption rate of the vehicle, and a method for tracking an optimal state of charge function for a hydrostatic accumulator are provided. The driveline includes a power source, a drive axle, a first fluid accumulator, a second fluid accumulator, an auxiliary circuit including a first pump drivingly engaged with the power source, and a drive circuit including a second pump drivingly engaged with the power source, a motor drivingly engaged with the drive axle, and a directional valve. The second pump is in fluid communication with the directional valve and the directional valve in fluid communication with the first fluid accumulator and the second fluid accumulator. The directional valve may be selectively controlled to direct fluid from the second pump and the motor to the first fluid accumulator and the second fluid accumulator.09-27-2012
20130167518Control Arrangement and Method for Activating a Plurality of Hydrualic Consumers - A control arrangement for supplying pressure medium to a plurality of consumers. A supply metering orifice and an individual pressure compensator are associated with each consumer of the plurality of consumers. The individual pressure compensator is adjusted via a central control unit.07-04-2013
20130167519Door Controller for Vehicles and Method for Actuating a Cylinder of a Vehicle Door - The invention relates to a door control system for vehicles, with a compressor (07-04-2013
20130133318HYDRAULIC TRAVEL DRIVE WITH A CLOSED HYDRAULIC CIRCUIT AND METHOD FOR OPERATING SUCH A TRAVEL DRIVE - A hydraulic travel drive includes a primary hydraulic machine and at least one secondary hydraulic machine connected in a closed hydraulic circuit via a first and a second working line. A first accumulator is connected via a first valve to the first working line and via a second valve to the second working line. A second accumulator is connected via a third valve to the first working line and via a fourth valve to the second working line. The four valves are non-proportional switching valves each having two defined switching positions. A method for operating the drive includes comparing the high pressure working line to the first accumulator. If pressure in the accumulator is lower than in the working line, the first accumulator is connected to the high pressure working line for charging until pressure in the accumulator corresponds to that of the working line.05-30-2013
20130091833Hydraulic control system and hydraulic control method - A hydraulic control system and a hydraulic control method are disclosed. The hydraulic control system comprises a first closed pump (P04-18-2013
20130091835DEAD-VOLUME MANAGEMENT IN COMPRESSED-GAS ENERGY STORAGE AND RECOVERY SYSTEMS - In various embodiments, coupling losses between a cylinder assembly and other components of a gas compression and/or expansion system are reduced or eliminated via valve-timing control.04-18-2013
20130091834DEAD-VOLUME MANAGEMENT IN COMPRESSED-GAS ENERGY STORAGE AND RECOVERY SYSTEMS - In various embodiments, coupling losses between a cylinder assembly and other components of a gas compression and/or expansion system are reduced or eliminated via valve-timing control.04-18-2013
20130098016Meterless Hydraulic System Having Flow Sharing and Combining Functionality - A hydraulic system includes a variable-displacement first pump, a variable-displacement second pump, and a first actuator selectively connected either to the first pump in a closed loop manner and not the second pump, or to the first and second pumps in a closed loop manner. The hydraulic system also includes a second actuator selectively connected either to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner. The hydraulic system further includes a variable-displacement rotary actuator selectively connected either to the first pump in a closed loop manner and not the second pump, or to the first and second pumps in a closed loop manner.04-25-2013
20130098011HYDRAULIC SYSTEM HAVING MULTIPLE CLOSED-LOOP CIRCUITS - A hydraulic system is disclosed. The hydraulic system may have a first circuit fluidly connecting a first pump to a swing motor in a closed-loop manner, and a second circuit fluidly connecting a second pump to a first travel motor and a first linear tool actuator in a parallel closed-loop manner. The hydraulic system may also have a combining valve configured to selectively fluidly connect the first circuit to the second circuit.04-25-2013
20130098019Meterless Hydraulic System Having Flow Sharing and Combining Functionality - A hydraulic system includes a variable-displacement first pump and a variable-displacement second pump. The hydraulic system also includes a first actuator selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner. The hydraulic system further includes a second actuator and a variable-displacement rotary actuator that are each selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner.04-25-2013
20130098020Meterless Hydraulic System Having Flow Sharing and Combining Functionality - A hydraulic system includes a variable-displacement first pump, an over-center variable-displacement first travel motor selectively connected to receive fluid pressurized by the first pump in a closed loop manner, and an over-center variable-displacement second travel motor selectively connected to receive fluid pressurized by the first pump in parallel with the first travel motor in a closed loop manner. The hydraulic system also includes a linear actuator selectively connected to receive fluid pressurized by the first pump in parallel with the first and second travel motors in a closed loop manner.04-25-2013
20130098018HYDRAULIC SYSTEM - A hydraulic system includes a variable displacement first pump, a first linear actuator fluidly connected to the first pump via a first closed-loop circuit, a variable displacement second pump, and second and third linear actuators fluidly connected to the second pump in parallel via a second closed-loop circuit. The system also includes a variable displacement third pump, a fourth linear actuator fluidly connected to the third pump via a third closed-loop circuit, a variable displacement fourth pump, and a first rotary actuator fluidly connected to the fourth pump via a fourth closed-loop circuit. The system further includes a second rotary actuator fluidly connected to the second pump in parallel with the second and third linear actuators. The system also includes a third rotary actuator fluidly connected to the third pump in parallel with the fourth linear actuator.04-25-2013
20130098014CLOSED-LOOP HYDRAULIC SYSTEM HAVING FORCE MODULATION - A hydraulic system is disclosed. The hydraulic system may have a unidirectional variable displacement first pump, a first actuator connected to the first pump via a closed-loop first circuit, and a first switching valve disposed between the first actuator and the first pump. The first switching valve may be configured to control a fluid flow direction through the first actuator. The hydraulic system may also have a second actuator connected to the first pump in parallel with the first actuator via the first circuit, and a second switching valve disposed between the second actuator and the first pump. The second switching valve may be configured to control a fluid flow direction through the second actuator. The hydraulic system may further have a modulation valve associated with the first circuit and configured to selectively modulate a pressure of the first circuit during actuation of the first or second switching valves.04-25-2013
20130111889Crawler Vehicle Drive Control System - A drive control system of a crawler vehicle has a lever, a hydraulic distributor for feeding pressurized oil over a feed line to a hydraulic actuator. The hydraulic actuator can engage and release a central clutch. A cable has a first end fixed to a rod of the hydraulic actuator, and a second end connected to the hydraulic distributor. The cable activates and deactivates the hydraulic distributor, depending on the position of the rod. A main pulley is integral with the lever about which the cable is wound.05-09-2013
20130125536System and method for energy recovery - An energy transfer system includes a power transfer mechanism, a first system, and a second system. The first system includes a first pump-motor operatively connecting the first system to the power transfer mechanism and a regenerative system operatively connected to the first pump-motor. The second system is operatively connected to the power transfer mechanism. Power is transferred between systems by the power transfer mechanism. A method of energy transfer is also provided.05-23-2013
20130133319AUTOMATED SHIFTING OF HYDRAULIC DRIVE SYSTEMS - A drive system for propelling a power machine over a support surface is disclosed. The drive system includes a hydraulic pressure source and a drive assembly. The drive assembly has a hydraulic motor in fluid communication with the hydraulic pressure source that is switchable between first and second displacement arrangements. A shift valve receives pressurized fluid from the hydraulic pressure source and provides a shift signal to the hydraulic motor to selectively cause the displacement of the hydraulic motor to shift between the first and second displacement arrangements. A sensing device capable of generating a load signal indicative of a load condition provided by the drive assembly is also provided. An electronic controller provides a control signal to the shift valve to control the displacement of the hydraulic motor in response at least in part due to the load signal.05-30-2013
20130152569Speed Control Strategy - A method for efficiently decelerating a vehicle having front and rear wheel brakes by isolating the rear wheel brakes and applying pressurized brake fluid only to the front wheel brakes.06-20-2013
20110219759Single-Axis Drive System and Method - A system for moving an object in one axis that creates highly dispersed but precisely controlled mechanical force to support, manipulate, and maintain an object, tool or application in precise alignment or orientation with respect to a stationary or moving target is disclosed. The system includes one or more fluid containers within a cylindrical enclosure or drum, and a shaft running through longitudinal axis of the drum. The shaft is coupled to the drum by rotating assemblies so that the drum may rotate around the shaft or the draft may rotate inside the drum. The fluid inflatable containers are arranged in a inside the drum around the shaft so that each container exerts expansive force between a vane fixed to the drum and a vane fixed to the shaft. A volume of the fluid may be placed in the one or more fluid containers by control systems. By changing the volume of fluid in the one or more containers, forces are exerted on the vanes and the object is moved.09-15-2011
20130145752METHOD OF USING A PUMP POSITION SENSOR FOR AN EBS PUMP CHECK - A method of performing a pump check for a brake system comprises determining a first position of a pump with a pump position sensor upon ignition of a vehicle. A pump motor is powered based upon a preselected operating condition. A second position of the pump is determined with the pump position sensor. The first position of the pump and the second position of the pump are compared. The pump motor is confirmed as operational when the second position of the pump is different from the first position of the pump.06-13-2013
20130145753Turbomachinery Having Self-Articulating Blades, Shutter Valve, Partial-Admission Shutters, and/or Variable-Pitch Inlet Nozzles - An axial-flow turbine assembly that includes one or more features for enhancing the efficiency of the turbine's operation. In one embodiment, the turbine assembly includes a turbine rotor having blades that adjust their pitch angle in direct response to working fluid pressure on the blades themselves or other part(s) of the rotor. In other embodiments, the turbine assembly is deployable in an application, such as an oscillating water column system, in which the flow of working fluid varies over time, for example, as pressure driving the flow changes. In a first of these embodiments, the turbine assembly includes a valve that allows the pressure to build so that the flow is optimized for the turbine's operating parameters. In a second of these embodiments, one or more variable-admission nozzle and shutter assemblies are provided to control the flow through the turbine to optimize the flow relative to the turbine's operating parameters.06-13-2013
20130145755Device for compacting a granular mass such as concrete cement - An improved compacting device for compacting a granular, loosely coherent mass, such as soil-moist cement, for producing end products such as tiles, kerbstones and the like. The compacting device includes a vibrating table and a hydraulic exciter device for driving the vibrating table. The hydraulic exciter device includes a plurality of hydraulic exciters and is configured to drive the hydraulic exciters with excitation displacements of mutually substantially the same amplitude and frequency and in phase with one another. An improved hydraulic exciter for use in the improved compacting device, and the improved compacting device with a single improved exciter of this type are also described.06-13-2013
20100287922Hybrid hydraulic drive system with accumulator as the frame of vehicle - A hybrid hydraulic power transmission system for all terrestrial's vehicles comprises a prime mover and an accumulator which could also be used as the main load bearing full or partial frame for all those vehicles. A hydraulic power integrator is operatively connected to the prime mover and the accumulator and selectively able to draw power for the vehicle from the prime mover, the accumulator, or a combination thereof.11-18-2010
20100287921Hydraulic Function Auto-Control Mode Deactivation - A work machine (11-18-2010
20100281858REGENERATIVE SUSPENSION WITH ACCUMULATOR SYSTEMS AND METHODS - In exemplary embodiments, a regenerative suspension system replaces or complements a standard shock absorber on a vehicle. A pump attaches via a hose to a central accumulator cylinder that is mounted on a vehicle. Pressurized fluid, air, or other material charges the accumulator. The Pressurized fluid, air, or other material is controllably released via a valve in order to perform work.11-11-2010
20120255290LATCHING ACTUATOR - A latching actuator capable of repeated operation in a cryogenic, remote, or difficult-to-access environment, capable of enduring many cycles without user intervention or maintenance, capable of latching in a fixed position without consuming additional power, or to operate independent of external environmental conditions. In selected embodiments, a latching actuator may comprise an expansion chamber that houses a working substance capable of undergoing a phase change, a logic mechanism, a biasing assembly, and an output pin. In one embodiment, a wax motor may provide the motive force to toggle a latching mechanism. An actuator may be capable of positioning an output pin in two or more discrete latching positions and may be used to create a thermal connection between two structures, to engage or disengage a clutch, or to position an optical element in an optical instrument. An actuator may also be used as a launch lock apparatus.10-11-2012
20130152567Liquid gas power generation - The Lungie Pet Leash system uses an elastic material attached to a static control leash to: reduce and/or eliminate the effects of sudden impact, hyper-extension or other forces caused by a pet's movements; avoid being pulled off balance, or injured; prevent or lessen injury to a pet from sudden stopping during a full tilt run.06-20-2013
20130152564ELECTRONIC HILL HOLD CONTROL OF A HYDROSTATIC TRANSMISSION - A hill hold control system and method for a closed loop transmission of a machine is disclosed that includes performing the following steps while the transmission is in neutral: sensing motor shaft movement; and generating fluid flow to offset motor shaft movement and cause substantially zero shaft movement. The method can include comparing a brake timer to a delay value, and activating a brake when the timer exceeds the delay value. The method can include sensing when a brake is applied, and discontinuing the step of generating fluid flow to offset motor shaft movement when a brake is applied. Motor shaft movement can be sensed by sensing rotational speed. Generating fluid flow to offset motor shaft movement can include determining direction and magnitude of fluid flow as a function of the sensed movement; and adjusting the direction and magnitude of fluid flow based on recurring readings of the sensed movement.06-20-2013
20130152568VALVE ACTIVATION IN COMPRESSED-GAS ENERGY STORAGE AND RECOVERY SYSTEMS - In various embodiments, valve efficiency and reliability are enhanced via use of hydraulic or magnetic valve actuation, valves configured for increased actuation speed, and/or valves controlled to reduce collision forces during actuation.06-20-2013
20130152565HYDRAULIC SYSTEM HAVING ENERGY RECOVERY - A hydraulic system for a machine is disclosed. The hydraulic system may have a pump configured to pressurize fluid, a swing motor driven by pressurized fluid to swing a body of the machine relative to an undercarriage, and a first circuit fluidly connecting the pump to the swing motor. The hydraulic system may also have an energy recovery motor mechanically connected to the swing motor, at least one accumulator, and a second circuit fluidly connecting the at least one accumulator to the energy recovery motor.06-20-2013
20130152566FLUID FLEXIBLE CONTAINER PUMP - System for converting mechanical energy such as ocean power into fluid power which is directed to energy conversion systems or other purposes. Included are fluid inflatable containers arranged to receive mechanical energy from a plunger mounted on a shaft, such that the flexible wall of the container forms a rolling lobe in response to changes in volume, enclosed within a drum, said shaft running axially through the drum and coupled to the drum by bearings so that the drum and shaft may move in relation to one another, a vane runs longitudinally on the drum and extending radially from an attachment point at the inner surface of the drum to the surface of the shaft. The mechanical energy is connected directly or indirectly to either the shaft or to the drum. Mechanical forces cause the plunger to press into the fluid inflatable container expelling fluid and creating fluid flow.06-20-2013
20110271666MULTISTAGE LIQUEFIED GAS EXPANDER WITH VARIABLE GEOMETRY HYDRAULIC STAGES - Embodiments are directed to an expander having two or more hydraulic stages with different physical geometries. In an embodiment, a first hydraulic stage uses nozzle vanes machined with a first geometry, while a second hydraulic stage uses nozzle vanes machined with a second geometry. Different nozzle vanes can be combined to tune the performance of the expander as the optimal operating conditions change. In yet another embodiment, an expander is equipped with a generator having a double wound stator with two sets of parallel windings. For high operating loads greater than a threshold, a first set of windings operates while a second set of windings, operating at a lower frequency, is disconnected. For operating loads that are less than the threshold, the first set of windings is disconnected and the second set of windings operates, enabling the generator to continue to operate close to 100% load for less expander power.11-10-2011
20110308242COMMAND BASED METHOD FOR ALLOCATING FLUID FLOW FROM A PLURALITY OF PUMPS TO MULTIPLE HYDRAULIC FUNCTIONS - Fluid from two pumps is allocated to a plurality of hydraulic actuators based on a plurality of flow commands, each specifying a desired amount of flow to be applied to a different hydraulic actuator. For a given hydraulic actuator, the allocation involves (1) determining an apportionment of the desired amount of flow, if no other hydraulic actuator is active, and (2) altering the apportionment in response to all the plurality of flow commands, and (3) using the altered apportionment to determine a first amount of the flow for one pump to provide and a second amount of the flow for the other pump to provide. The process is repeated for all the hydraulic actuators. Supply valves for each hydraulic actuator are controlled by the associated first and second amounts and each pump is controlled in response to either the first or second amounts for all the hydraulic actuators.12-22-2011
20110308241COMPRESSED AIR ENGINE - An air engine system includes a motor coupled to the drive shaft of an air engine to control the speed of the air engine. The air engine uses compressed air from a compressed air source provided by an air compressor. The air engine may be used on a vehicle, providing a clean environmentally-friendly means of locomotion. Conventional internal combustion engines may be retrofitted to operate on compressed air. Many of the parts on an internal combustion engine are not needed after retrofitting to be an air engine, including the heads. The heads are replaced by head plates that are coupled to solenoids that provide both intake and exhaust functions to the cylinders, thereby replacing the valves in the heads. A kit provides parts and instructions for retrofitting an existing internal combustion engine to run on compressed air.12-22-2011
20120017577HYDRAULIC SOFT START SYSTEM - A hydraulic soft-start system includes a first flow valve in fluid communication with a pressure source and an inlet of a motor. A first restricting orifice is disposed between the first valve and the inlet. A second flow valve is in fluid communication with the first valve and the inlet. A pilot for actuating the second valve is in fluid communication with the inlet. A second restricting orifice is disposed between the pilot and the inlet. Upon actuation of the first valve, a first flow is passed from the pressure source via the first orifice to the inlet, placing the motor in a partially-actuated state. The second valve being actuated after a threshold pressure of the pilot is reached allowing a second flow to pass from the pressure source to the inlet. The second flow being higher than the first flow, thereby placing the motor in a fully-actuated state.01-26-2012
20130192216COMPRESSED GAS ENERGY STORAGE SYSTEM USING TURBINE - An energy storage system utilizing compressed gas as a storage medium, may include one or more turbines configured to convert energy in gas expansion and compression processes. One or more axial and centrifugal turbines may be used to store energy by compressing gas, and to recover energy from expanding gas. A plurality of orifices/nozzles may introduce a liquid into the gas as a heat exchange medium. Orifices/nozzles may be disposed on various surfaces of a turbine and/or in a separate mixing chamber flowing to a turbine. Structures of the turbine may be designed to mitigate damage caused by liquid injection, for example the turbine blades may be flexible and/or comprise impact-resistant materials.08-01-2013
20120042642Method for Predefining a Rotational Speed of a Drive Machine of a Drive System - A method for predefining a rotational speed of a drive machine of a drive system is disclosed. The method involves at least the drive machine and a hydrostatic drive unit, wherein the rotational speed which is to be predefined for the drive machine is determined as a function of an instantaneous system state and a predicted system state of the drive system.02-23-2012
20130199168Apparatus and Method for Recuperation of Hydraulic Energy - An apparatus for recuperation of hydraulic energy from an actuator comprises a first hydraulic machine having a first drive and a second hydraulic machine having a second drive mechanically coupled to the first drive. The first hydraulic machine is in hydraulic communication with an actuator, and the second hydraulic machine (08-08-2013
20130098010Closed-Loop Hydraulic System Having Priority-Based Sharing - A hydraulic system is disclosed having first, second, and third pumps. The hydraulic system may also have a first actuator connected to the first pump in closed-loop manner, a second actuator connected to the second pump in closed-loop manner, and a third actuator. The hydraulic system may further have a selector valve associated with the third pump, and a first switching valve associated with the third pump and the third actuator. The first switching valve may be movable between a first position at which the third pump is connected to the third actuator in a closed-loop manner to move the third actuator in a first direction, a second position at which the third pump is connected to the third actuator in a closed-loop manner to move the third actuator in a second direction, and a third position at which the third pump is connected to the selector valve.04-25-2013
20130205762AUXILIARY FLOW VALVE SYSTEM AND METHOD FOR MANAGING LOAD FLOW REQUIREMENTS FOR AUXILIARY FUNCTIONS ON A TRACTOR HYDRAULIC SYSTEM - A system and method for managing hydraulic fluid load flow requirements for a tractor having a single pump hydraulic system. The system and method controls an implement hydraulic system and an auxiliary implement hydraulic system using a single hydraulic pump. The auxiliary flow valve system and method of the present disclosure gives precedence to the auxiliary functions so as to maintain full function of the auxiliary device. It also may supply a reduced flow, less than the maximum available from the system hydraulic pump to the auxiliary device. The remaining flow is available to the implement hydraulic system, with full flow being available to the implement when no auxiliary function is used. It also provides the ability to use a closed center valve in a load sensing system by bleeding flow pressure from the auxiliary hydraulic system.08-15-2013
20130205764KINETIC ENERGY TRANSFER SYSTEM AND METHODS - Systems, methods and apparatus for subjecting high-pressure fluids to a fluid flow assembly that generates or extracts work/energy using a work producing machine. Kinetic energy from the work producing machine is converted to electricity using a generator or similar apparatus.08-15-2013
20130205765METHOD FOR CONTROLLING A HYDRAULIC SYSTEM OF A WORKING MACHINE - A method is provided for controlling a hydraulic system of a working machine. The hydraulic system includes a hydraulic machine for providing hydraulic fluid to one or more actuators of the working machine. The method includes receiving a signal requesting a pump pressure from the hydraulic machine based on the load pressure of a first actuator of the one or more actuators which first actuator has the highest load pressure of the one or more actuators, discriminating the pressure request from the first actuator provided that the first actuator is stalled due to overload or geometrical limitations, and controlling the hydraulic machine to provide to pump pressure based on the load pressure of a second actuator of the one or more actuators which second actuator is in operation and has the second highest load pressure of the one or more actuators, or, if no actuator in addition to the first actuator is present and in operation, controlling the hydraulic machine to provide a predetermined idle pump pressure.08-15-2013

Patent applications in class Methods of operation