| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 060431000 | Condition responsive control of or by input to input pump drive means | 21 |
| 20110192156 | Hydraulic Drive Device for Construction Machine - A hydraulic drive device for a construction machine which can reliably judge whether or not the state of the construction machine is appropriate for stopping an engine is provided. The hydraulic drive device includes: a main pump | 08-11-2011 |
| 20110289911 | HYDRAULIC SYSTEM AND METHOD OF ACTIVELY DAMPING OSCILLATIONS DURING OPERATION THEREOF - A hydraulic system and a method of actively damping oscillations during actuation of a hydraulic cylinder in a hydraulic system is disclosed. The hydraulic cylinder is actuated by energizing a motor that rotatably drives a pump. The pump supplies a fluid to the hydraulic cylinder to actuate the cylinder. A pressure of the fluid is sensed during actuation of the hydraulic cylinder. A rotational speed of the motor is varied in response to the sensed pressure of the fluid. This varying of the rotational speed of the motor actively damps pressure oscillations during actuation of the hydraulic cylinder. | 12-01-2011 |
| 20090320462 | HYDRAULIC DRIVE APPARATUS AND HYDRAULICALLY-DRIVEN VEHICLE - The object of the present invention is to allow an operator to easily perform desired operations with high hydraulic efficiency, without an increase in difficulty of performing operations. A hydraulic drive apparatus of the present invention includes a pump control unit | 12-31-2009 |
| 20120023923 | HYDRAULIC TOOL THAT COMMANDS PRIME MOVER OUTPUT - The present disclosure provides embodiments directed towards a system for the control of hydraulic output by a hydraulic power source. In one embodiment, a system is provided. The system includes a hydraulic supply system having a drive, a hydraulic pump coupled to the drive, a first hydraulic output configured to supply a first flow of a hydraulic fluid from the hydraulic pump to a hydraulic lift, a second hydraulic output configured to supply a second flow of the hydraulic fluid from the hydraulic pump to a first hydraulic tool, and a controller configured to adjust a speed of the drive in response to a feedback indicative of a first load by the hydraulic lift, a second load by the first hydraulic tool, or a combination thereof. | 02-02-2012 |
| 20100083650 | HYDRAULIC CIRCUIT FOR OPERATING A TOOL - A hydraulic circuit for operating a tool is provided that is particularly useful in construction equipment such as an excavator, crane, wheel loader, drilling machine, or others. Furthermore, a control unit and a method for controlling the hydraulic circuit and construction equipment including such a hydraulic circuit is disclosed. | 04-08-2010 |
| 20090090102 | METHOD OF REDUCING THE LOAD OF ONE OR MORE ENGINES IN A LARGE HYDRAULIC EXCAVATOR - A method of reducing the load of at least one engine arranged in an hydraulic excavator during a speed overload situation of a respective engine, includes reducing a delivery quantity of at least one hydraulic secondary consumer until the respective engine has been returned to a desired operational speed range. | 04-09-2009 |
| 20090145121 | Hydraulic Drive Device for Dump Truck - [OBJECT] To provide a hydraulic drive system for a dump truck, which can prevent an excessive increase in engine rotation speed upon operation of a truck body. | 06-11-2009 |
| 20090282823 | POWER ASSIST HYDRAULIC STEERING SYSTEM WITH ON DEMAND PUMP - A power assisted hydraulic steering system comprises a helm pump hydraulically connected to a first hydraulic actuator. A power assist pump is hydraulically connected to a second hydraulic actuator. The first and second hydraulic actuators are coupled. A flow sensing mechanism is disposed along a hydraulic conduit which hydraulically connects the helm pump to the first hydraulic actuator. The flow sensing mechanism senses when fluid flows from the helm pump to the first hydraulic actuator. A motor actuates the power assist pump when the flow sensing mechanism senses that fluid is flowing from the helm to the first hydraulic actuator. In one embodiment the first hydraulic actuator is a servo cylinder and the second hydraulic steering actuator is a drive cylinder. | 11-19-2009 |
| 20100126162 | VELOCITY-PRESSURE CONTROL APPARATUS OF HYDRAULIC MACHINE - A velocity-pressure control apparatus of a hydraulic machine includes a pressure command generator, a pressure sensor, a pressure controller, a velocity command generator, a velocity limiter, a switch, a comparator, a velocity sensor, and a motor driver. The pressure controller receives a pressure compensation signal composed by the pressure command generator and the pressure sensor. The velocity limiter receives a compensation velocity signal from the pressure controller and a predetermined velocity signal from the velocity command generator and outputs a corresponding limiting velocity command signal to the switch. The comparator controls the velocity-pressure control apparatus to work at a velocity control mode when the pressure compensation signal is a positive signal or a null signal, and controls the velocity-pressure control apparatus to work at a master pressure control and slave velocity control mode when the pressure compensation signal is a negative signal. | 05-27-2010 |
| 20080271444 | RETURN TO NEUTRAL MECHANISM FOR HYDRAULIC PUMP - A return to neutral mechanism includes a hub, a lever and a biasing member. The hub is configured to connect fast to a control rod of an associated hydraulic pump. The lever connects to the hub and includes a location configured to connect to an associated linkage that is connected to an associated steering mechanism. The biasing member connects to the lever for biasing the lever and the control rod toward a neutral position. | 11-06-2008 |
| 20100293937 | HYDRAULIC DRIVE WITH AN INDEPENDENT CHARGE PUMP - The invention relates to a hydraulic drive ( | 11-25-2010 |
| 20110126533 | METHOD FOR CLOSED-LOOP POWER CONTROL OF A ROAD FINISHING MACHINE OR FEEDER AND A ROAD FINISHING MACHINE OR FEEDER COMPRISING THE SAME - In the hydrostatic working operation of a road finishing machine or a feeder which comprises a primary power plant with an internal combustion engine (M) and several hydraulic variable displacement pumps, which are hydraulically connected to hydraulic motors of working components, and which possesses a computerized control device, the internal combustion engine is operated within its engine-specific characteristic map in response to the load condition by dynamic speed adaptation in a characteristic zone with optimal consumption, and the displacements (V | 06-02-2011 |
| 20090320461 | CONTROL DEVICE OF ENGINE, CONTROL DEVICE OF ENGINE AND HYDRAULIC PUMP, AND CONTROL DEVICE OF ENGINE, HYDRAULIC PUMP, AND GENERATOR MOTOR - An object of the present invention is to operate the working machine etc. with satisfactory responsiveness as intended by the operator while enhancing engine efficiency, pump efficiency, and the like, where a first engine target revolution ncom | 12-31-2009 |
| 20100058752 | ROTATION CONTROL SYSTEM FOR WORKING-MACHINE PUMP - A rotation control system of a hoist pump includes: the hoist pump ( | 03-11-2010 |
| 20100064677 | WORK MACHINE - A work machine includes: hydraulic actuators | 03-18-2010 |
| 20090193802 | CONTROL METHOD FOR HYDRAULIC TYPE CONTINUOUSLY VARIABLE TRANSMISSION - A control method for a hydraulic type continuously variable transmission for suppressing a harmful effect due to the reacceleration just after deceleration of a vehicle. In a hydraulic type continuously variable transmission, the operation of a shifting actuator is stopped to suspend the shift control (S | 08-06-2009 |
| 20120304635 | Engine Control Device - A first target engine speed is set in response to a command value commanded by a command unit. A second target engine speed equal to or lower than the first target engine speed is set based on the first target engine speed. When the first target engine speed is reduced, the second target engine speed is set to be constant or be decreased and a reduction range for decreasing the first target engine speed to the second target engine speed is set to be decreased. The reduction range is set at zero when the first target engine speed is equal to or lower than an engine speed at least at a maximum torque point. | 12-06-2012 |
| 20120117959 | Remote Control Circuit for a Hydraulically Operated Device - A flow circuit enables an ROV to control a submersible machine having three motors without electronics, and using only two fluid flow lines between the machine and the ROV. The circuit configures two of the motors to operate in parallel, and a switch valve between the parallel motors and the third motor. A detection circuit on the machine detects the presence or absence of a back pressure in the controlling lines. If a back pressure is detected, the circuit on the machine directs fluid to either of the motors in parallel, or the third motor, thereby enabling the operator to select which motor or motors to operate by creating or releasing a back pressure. | 05-17-2012 |
| 20120124987 | SELF-CONTAINED MODULAR ACTUATOR - Pneumatic actuator apparatuses with expandable chambers, and methods of using same. In some embodiments, the apparatuses are self-contained and/or self-inflating. | 05-24-2012 |
| 20100199655 | HYDRAULIC PUMP CONTROL SYSTEM - A hydraulic load ramping system, in certain aspects, may utilize load sensing feedback from an engine, thereby reducing the possibility of overloading the engine as well as smoothing the transition between hydraulic load levels. In particular, by ramping between hydraulic load levels, unwanted movement of hydraulically-driven equipment may be minimized. In addition, by efficiently monitoring the load sensing feedback and ramping between hydraulic load levels, the hydraulic output may be maximized. | 08-12-2010 |
| 060432000 | Pump drive means deactivated responsive to position of output stroke device | 1 |
| 20120090310 | KINEMATIC CONTROL IN A HYDRAULIC SYSTEM - A hydraulic system is provided, having a pump, operably connected to a motor. It also comprises a controller-driven hydraulic actuator, operably connected to the pump and a hydraulic valve, operable to direct hydraulic fluid to and from either a rod side or a cylinder side of the hydraulic actuator. Rod and cylinder side pressures are pre-defined based on the instantaneous acceleration or deceleration required. Decelerating the hydraulic actuator could involve maintaining the current pressure in the meter-out side of the hydraulic actuator and decreasing the current pressure in the meter-in side by varying the speed of the pump. Deceleration of the hydraulic actuator could also include decreasing pressure on the meter-in side of the hydraulic actuator at a higher rate than on the meter-out side. Acceleration is achieved using a similar approach. | 04-19-2012 |
