摘要:
At least one solenoid actuator and a valve are at least partially positioned within a body of an hydraulic device. The solenoid actuator includes at least one solenoid coil mounted to a stator that defines a guide bore in which a push pin moves between a first position and a second position. The valve includes a valve member that is operably coupled to move with the push pin. The push pin is attached to an armature that is positioned adjacent the solenoid coil. In order to increase the durability of the solenoid actuator, a relatively hard, nonmagnetic material is positioned between an inner surface of the stator that is made from a relatively soft, magnetic material and an outer surface of the push pin.
摘要:
A control system adapted to control an actuator between extended and retracted positions has a fluid control valve connected to the actuator a source of high pressure fluid and a reservoir. The fluid control valve is movable between a first position at which the actuator is connected back to the fluid reservoir adapted and a second position operable to connect the actuator to a high pressure actuation fluid source. An electronic control module is connected in control communication with the fluid control valve and adapted to automatically generate a control signal to position the control valve at the second position in response to an elapsed time being passed at which the fluid control valve is at the first position is greater than a predetermined time.
摘要:
Electrically controlled fuel injection systems should be able to operate at low voltage. In order to operate an electrically controlled fuel injection system at low voltage, the voltage available to an electrical actuator is monitored. The electrical actuator is coupled to a valve positioned within a passageway in which high pressure actuation fluid flows to and from an hydraulically actuated device, such as a fuel injector and/or an engine brake. If the voltage available to the electrical actuator falls below a predetermined voltage, the pressure differential across the valve is reduced. Although the principal application of the present invention is in the fuel injection system, the present invention has application in any electrically controlled fluid system at low voltage.
摘要:
A nozzle insert that is capable of being irreversibly attached to a needle valve tube such that the resulting needle valve member can be used in a nested needle valve configuration for a dual mode fuel injector.
摘要:
A jumper tube with improved misalignment capability comprising a cylindrically shaped receiver portion having a central bore that receives an electronically controlled hydraulically actuated unit fuel injector, an annular groove disposed adjacent each end of the bore, a resilient seal ring disposed in each annular groove, forming a seal between the injector and the bore and providing three degrees of freedom between the injector and bore, a tubular portion having an elongated passage in fluid communication with the bore and a conduit in fluid communication with an actuating fluid manifold and the elongated passage and a bolt extending through the tubular portion, the conduit portion and a portion of the actuating fluid manifold removably attaching the jumper tube to a head of an internal combustion engine.
摘要:
A rotor balancing arrangement is provided for use in a distribution valve to ensure hydrostatic balancing of a rotor located in the distribution valve. Some balancing arrangements provide areas equally spaced around the peripheral surface, each being exposed to the same pressure, however, they are limited to valves which rotate only through a limited arc of rotation. Other valves which rotate provide balancing grooves around portions of the peripheral surface but do not provide any control for the pressure that migrates axially in both directions along the peripheral surface of the rotor. In the subject arrangement, pressure fields of a predetermined size are located on a peripheral surface of a rotor circumscribing first and second outlet ports which open to opposite sides of the rotor. The size of the pressure fields is determined by the relationship of the diametrical clearance between the rotor and a bore with respect to the operating pressure of the system. This arrangement ensures that the differential forces acting on opposite sides of the rotor are minimized thus eliminating rotor sticking.
摘要:
A method of purging fuel supply components for a combustion chamber of a regeneration assembly is disclosed. A regeneration cycle is performed during which fuel is supplied from a fuel source to the combustion chamber with fuel supply components including a fuel supply circuit and at least one fuel injector unit. At least a first purging cycle is initiated to purge residual fuel from the fuel supply components. During the purging cycle, a flow of purging gas is directed to the at least one fuel injector unit to purge residual fuel from the at least one fuel injector unit. Also during the purging cycle, a flow of purging gas is directed to the fuel supply circuit to purge at least a portion of the fuel in the fuel supply circuit toward the fuel source.
摘要:
A dual solenoid latching actuator is disclosed and provides an electrical circuit that includes at least one current restrictor, which are preferably a first diode and a second diode. The at least one current restrictor is positioned and arranged such that current flowing in a first direction can energize only one of a first solenoid coil and a second solenoid coil and current flowing in a second direction can energize only the other solenoid coil.
摘要:
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.
摘要:
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.