Patent application number | Description | Published |
20090107462 | FUEL SYSTEM HAVING A ONE-PIECE HOLLOW TUBE CONNECTION - A fuel system for an engine including a cylinder head having a first bore and a second bore intersecting the first bore is disclosed. The fuel system includes a common rail and a fuel injector coupled to the cylinder head and at least partially received within the first bore. The fuel system also includes a one-piece hollow tube, extending linearly from the common rail to the fuel injector through the second bore. The one-piece hollow tube is configured to communicate high pressure fuel from the common rail to the fuel injector. | 04-30-2009 |
20090114189 | High pressure pump and method of reducing fluid mixing within same - Mixing a pumped fluid with a lubrication fluid within a pump can undermine the lubricity of the lubrication fluid. In order to reduce mixing of fluids within a pump of the present disclosure, a pump is provided that comprises a housing, a piston, a first annulus, and a second annulus. The housing includes an inlet for the pumped fluid, an inlet for the lubrication fluid provided at a first pressure, and a piston bore fluidly coupled to the inlet for the pumped fluid. The piston is moveable within the piston bore. The first annulus is fluidly coupled to the inlet for the lubrication fluid. The second annulus is configured to be fluidly coupled to a drain circuit provided at a second pressure less than the first pressure. The first annulus and the second annulus are located along the length of the piston bore. | 05-07-2009 |
20090134240 | Method of making piezoelectrically actuated device - A method of making a piezoelectrically actuated device includes the steps of compressing a piezoelectric element toward a compression state which is based on a target preload for the piezoelectric element, and elastically deforming a casing for the piezoelectric element toward a spring state which is also based on the target preload for the piezoelectric element. The method further includes plastically deforming the casing about the subassembly when the piezoelectric element and the casing are at their respective compression state and spring state to set a preload of the piezoelectric element at the target preload | 05-28-2009 |
20090159053 | Pumping element for a fluid pump and method - A pumping element for pressurizing a fluid within a fluid pump includes a plunger reciprocally disposed within a bore defined in a barrel. The plunger and barrel at least partially define a pressurization chamber into which fluid is pressurized. A flow path is defined between the plunger and the bore, the flow path permitting fluid to pass from the pressurization chamber during pressurization of fluid disposed therein. A collection chamber is formed between the plunger and the bore, the collection chamber being disposed adjacent to the bore and being part of a cooling circuit for the pumping element. A plurality of weep openings is defined in the barrel and is fluidly connected to the collection chamber. A reduced diameter portion of the barrel forms an annular reservoir that receives fluid from the weep openings. | 06-25-2009 |
20100276520 | INDIRECT LASER INDUCED RESIDUAL STRESS IN A FUEL SYSTEM COMPONENT AND FUEL SYSTEM USING SAME - A metallic fuel system component includes an internal surface and an external surface. The metallic fuel system component is made by inducing compressive residual stress in only a portion of the internal surface of the metallic fuel system component by transmitting a laser shock wave through the metallic fuel system component from the external surface to the internal surface. | 11-04-2010 |
20110030343 | SCR REDUCTANT DEPOSIT REMOVAL - An engine exhaust aftertreatment system including a selective catalytic reduction (SCR) system. The SCR system includes a reductant injection system configured to introduce a reductant into a exhaust stream of a engine, a SCR catalysts configured to reduce NOx in the presence of a reductant, and a SCR monitoring system configured to determine temperatures associated with the SCR system. The SCR system also includes a heat source configured to raise the temperature of the exhaust stream and a controller configured to operate the heat source to reach exhaust stream temperatures in the SCR system of at least about 400 degrees Celsius based on the temperature associated with the SCR system. | 02-10-2011 |
20110064588 | INLET THROTTLE CONTROLLED LIQUID PUMP WITH CAVITATION DAMAGE AVOIDANCE FEATURE - A liquid pump includes an electronically controlled throttle inlet valve to control pump output. With each reciprocation cycle, a plunger displaces a fixed volume of fluid. When less than this fixed volume is desired as the output from the pump, the electronically controlled throttle inlet valve throttles flow past a passive inlet check valve to reduce output. As a consequence, cavitation bubbles are generated during the intake stroke. Cavitation damage to surfaces that define the inlet port passage are avoided by a specifically shaped and sized cavitation flow adjuster extending from the valve member of the passive inlet check valve. By positioning the cavitation flow adjuster in the inlet port passage, a flow pattern is formed in a way to encourage cavitation bubble collapse away from surfaces that could result in unacceptable cavitation damage to the pump. | 03-17-2011 |
20110146600 | METHOD OF COOLING A HIGH PRESSURE PLUNGER - A pumping element for pressurizing a fluid within a fluid pump includes a plunger reciprocally disposed within a bore defined in a pump housing. The plunger and housing at least partially define a pressurization chamber into which fluid is pressurized. A flow path is defined between the plunger and the bore, the flow path permitting fluid to pass from the pressurization chamber during pressurization of fluid disposed therein. A weep annulus is formed between the plunger and the bore, the weep annulus being disposed adjacent to the bore and being part of a cooling circuit for the pumping element. The housing further defines cooling and drain passages which are in fluid communication with one another via the weep annulus. The plunger an bore are convectively cooled when cooling fluid is supplied to the weep annulus via the cooling passage and drained away via the drain passage. | 06-23-2011 |
20110272499 | HYDRAULICALLY AMPLIFIED MECHANICAL COUPLING - A component includes a transmission arrangement for transmitting a force between an actuator and a control valve. The transmission arrangement includes a post that is associated with the actuator. The control valve is displaceable to an open position from a closed position when an opening force is applied to the control valve that is greater than a closing force provided to the control valve. The transmission arrangement is disposed in the component between the post and the control valve actuator and arranged to mechanically transmit by physical contact an actuator force from the post to the control valve when the post begins to travel towards the extended stroke position, and hydraulically amplify the actuator stroke between the post and the control valve when the post travels from the retracted stroke position to the extended stroke position. | 11-10-2011 |
20120199101 | PRESSURE RECOVERY SYSTEM FOR LOW LEAKAGE CAM ASSISTED COMMON RAIL FUEL SYSTEM, FUEL INJECTOR AND OPERATING METHOD THEREFOR - A fuel system includes a plurality of fuel injectors each defining a nozzle supply passage, a nozzle outlet, a low pressure space, and a drain. The fuel system includes a plurality of mechanically actuated pressure intensifiers each including a tappet and being positioned partially within one of the fuel injectors, and a common rail fluidly connecting with each of the fuel injectors. Each of the fuel injectors further includes an injection pressure control mechanism having an injection pressure control valve. Each injection pressure control valve blocks the corresponding pressure intensifier from the common rail and fluidly connects the pressure intensifier with the low pressure space at a first position, and fluidly connects the pressure intensifier with the common rail and blocks the pressure intensifier from the low pressure space at a second position. Each of the fuel injectors further includes a pressure recovery mechanism having a pressure recovery valve. Each pressure recovery valve blocks the corresponding pressure intensifier from the common rail and fluidly connects the low pressure space and the drain at the first position, and fluidly connects the low pressure space with the common rail and blocks the low pressure space from the drain at the second position. Injecting fuel via operating the fuel system may include operating the fuel system in a low leakage mode where the pressure intensifier displaces fuel at a low pressure, between high pressure injections. | 08-09-2012 |
20130306029 | Direct Injection Gas Engine and Method - An engine includes an engine having at least one cylinder and a cooling system that circulates coolant. A gaseous fuel system includes a heater and a gaseous fuel injector. Liquefied gaseous fuel is heated by extracting engine heat from the engine coolant and providing it to a stream of liquefied gaseous fuel passing through the heater. Heated gaseous fuel is injected directly into the cylinder. A liquid fuel system having an injector provides liquid fuel directly into the cylinder as ignition source. A sensor measures an outlet coolant temperature from the heater and provides a signal to a controller such that the engine can operate in a normal or in a thermal management mode during which engine heat extracted from the engine coolant is reduced. | 11-21-2013 |
20140041633 | DUAL FUEL ENGINE AND EVAPORATED NATURAL GAS SYSTEM - A dual fuel compression ignition engine operates by injecting gaseous fuel and liquid diesel fuel from a common fuel injector directly into each engine cylinder. The gaseous fuel is ignited by compression igniting a small pilot injection quantity of the liquid diesel fuel. Evaporated natural gas from a cryogenic tank and/or a fuel conditioning module is dosed into an intake manifold of the engine with an electronically controlled supply valve. The electronically controlled supply valve may open to supply evaporated gas to the intake manifold contingent upon combustion conditions in the engine cylinder demonstrating a low risk of methane slip, and the dosing quantities are limited to reduce risk of ignition of an air/gas mixture in the intake manifold. | 02-13-2014 |
20140053800 | Dual Fuel System Diagnostics For Dual Fuel Engine And Machine Using Same - A machine includes a machine body and a dual fuel compression ignition engine attached to the machine body. A dual fuel system is operably coupled to supply the engine with liquid diesel fuel and natural gas fuel directly into respective cylinders of the engine. The fuel system includes an insulated tank for storing the natural gas fuel, a pressure sensor positioned to measure fluid pressure within the tank, and a pump for drawing the natural gas fuel from the tank. An electronic controller is in communication with the pressure sensor and has a cryogenic system diagnostics algorithm executable thereon that is configured to receive a pressure signal from the pressure sensor, detect a cryogenic system fault based on the signal, and generate a notification signal based on the fault. | 02-27-2014 |
20140069386 | LIMP HOME CAPABLE DUAL FUEL ENGINE AND MACHINE USING SAME - A dual fuel engine powers a machine by burning natural gas and liquid diesel fuel. When operating in a low load mode, some of the engine cylinders are fueled with a high ratio of diesel/gas, and the remaining cylinders are unfueled. When operating in a high load mode, all of the engine cylinders are fueled with a low ratio of diesel/gas. When operating in a limp home mode, the fuel injectors are configured to inject only diesel fuel into all of the plurality of engine cylinders. | 03-13-2014 |
20140130522 | Liquefied Gas Supply Conditioning System and Method - A conditioning system for a liquefied gas includes a source of liquefied gas, the liquefied gas provided from the source at a first temperature. A first heater is disposed to heat a flow of the liquefied gas to a second temperature. An accumulator is disposed to collect and store a quantity of the liquefied gas at the second temperature. A second heater is disposed to receive a flow of gas from the accumulator and the first heater, the second heater operating to heat the gas to a third temperature and provide the heated gas at the third temperature to a gas outlet. | 05-15-2014 |
20140182552 | DUAL FUEL COMMON RAIL SYSTEM AND DIESEL ONLY METHOD OF OPERATING SAME - A dual fuel common rail system may be operated in a regular mode in which a relatively large charge of gaseous fuel is ignited by compression igniting a relatively small injection quantity of liquid diesel fuel. The dual fuel system may be operated in a single fuel limp home mode in which liquid diesel fuel is injected at higher pressures. Over pressurization of the gaseous fuel side of the fuel system due to leaked liquid fuel is avoided by regularly injecting leaked liquid fuel, but not gaseous fuel, from the gaseous nozzle outlet set during the limp home mode of operation. | 07-03-2014 |
20140216403 | GAS FUEL SYSTEM - A gas fuel system for an engine is disclosed. The gas fuel system includes a fuel tank configured to supply cryogenic fuel. A cryogenic pump is configured to pressurize the cryogenic fuel received from the fuel tank. A heat exchanger is configured to receive the pressurized cryogenic fuel and an engine coolant. Further, the engine coolant flows through the heat exchanger to vaporize the pressurized cryogenic fluid. The gas system further includes a controller configured to receive a signal indicative of temperature of the engine coolant. Further, the controller sends a signal to impose one or more parasitic loads on the engine based on the temperature of the engine coolant. | 08-07-2014 |
20140316677 | Dual Fuel Common Rail Depressurization During Engine Shutdown And Machine Using Same - A machine includes a compression ignition engine fueled from common rail fuel injectors that predominately inject natural gas fuel that is compression ignited with a small pilot injection of liquid diesel fuel. When an engine shutdown command is communicated to an electronic controller, the supply of gaseous fuel to the gas rail is stopped and the gaseous fuel common rail is depressurized by continuing to run the engine and inject gaseous and liquid fuels while commanding a liquid pressure greater than the gas pressure. After the gas rail pressure has achieved an acceptable shutdown pressure, the engine is stopped. The gas rail pressure is then reduced to atmospheric pressure followed by the liquid fuel common rail being reduced to atmosphere pressure after stopping the engine. | 10-23-2014 |
20140331964 | Dual Fuel Engine Diagnostic System And Method Of Operating Same - A compression ignition engine is fueled from common rail fuel injectors that predominately inject natural gas fuel that is compression ignited with a small pilot injection of liquid diesel fuel. Prior to servicing the engine, a service tool may establish a communication link with an electronic controller that controls operation of the engine. Pressure information for a gaseous fuel common rail and a liquid fuel common rail are displayed with the service tool, when the engine is stopped, in order to determine whether the rails are completely depressurized indicating that it is then o.k. to perform servicing tasks. | 11-13-2014 |
20140346254 | FUEL INJECTOR FOR GASEOUS INJECTION - A fuel injector comprises a liquid fuel cavity and a gas fuel cavity disposed within an injector cavity housing a liquid needle valve stem and a gas needle valve stem, respectively. The gas needle valve stem includes a guide stem portion distal to the injector tip and a check proximal to the injector tip. A drain passage terminates in a drain annulus groove disposed in a guide cavity wall of a gas valve guide cavity. The gas valve guide cavity houses the guide stem portion defining a clearance between the guide cavity wall below the drain annulus groove and the guide stem portion. The liquid fuel from the drain passage flows to the gas needle valve stem and an inner surface of the gas fuel cavity, through the clearance. The liquid fuel drained through the clearance collects in a plurality of grooves on the check. | 11-27-2014 |