Abstract: A fuel injector for an engine is disclosed. The fuel injector has a plunger disposed within a bore, a nozzle member, a valve needle, a check valve, a spill valve, and a controller. The check valve is movable between a first position at which the valve needle is communicated with the bore, and a second position at which the valve needle is fluidly communicated with a drain. The spill valve is movable between a first position at which fuel flows from the bore to the drain, and a second position at which the fuel from the bore is blocked. The controller moves the spill valve toward its second position and the check valve toward its second position during a downward displacing movement of the plunger. The controller detects an unsuccessful movement of the check valve to the second position, and prematurely halts the current injection event in response to the detection.

Abstract: According to the present invention, a fuel injection apparatus includes a high-pressure passage, a low-pressure passage, an actuator, a first and a second piston, a displacement amplifying chamber, a fuel injection mechanism, and a fuel supplier. The high-pressure passage is configured to be filled with high-pressure fuel. The low-pressure passage is configured to be filled with low-pressure fuel. The first piston is configured to be displaced by the actuator. The displacement amplifying chamber communicates with the low-pressure passage and works to amplify and transmit to the second piston a displacement of the first piston by means of the low-pressure fuel therein. The fuel injection mechanism is configured to inject the high-pressure fuel into a cylinder of an internal combustion engine in response to the displacement of the second piston. The fuel supplier works to supply the high-pressure fuel from the high-pressure passage through pressure reduction directly to the low-pressure passage.

Abstract: A fuel delivery system comprises a fuel rail having an inlet, an outlet and a receptor associated with the outlet. The system further comprises a fuel injector. The inlet of the injector is configured for communication with the outlet of the fuel rail, and the injector outlet is configured for communication with a combustion chamber of an engine. The system still further includes a first feature associated with on one of the fuel rail and the injector, and a second feature associated with the other of the fuel rail and injector. The first and second features cooperate to form a seal between the injector and the fuel rail, and to maintain the axial alignment of the components.

Abstract: In a fuel pump control system for an internal combustion engine whose operation is switched between cut-off-cylinder operating mode during which some of the cylinders are non-operative and full-cylinder operating mode during which all of the cylinders are operative and having a fuel injector connected to the fuel supply line and supplied with fuel pressurized by the fuel pump, it is discriminated whether the operation of the engine is in the full-cylinder operating mode or in the cut-off-cylinder operating mode, the operation of the fuel pump is controlled based on the discriminated operating mode of the engine, i.e., is controlled such that the delivery flow rate of the fuel pump when the engine is discriminated to be in the cut-off-cylinder operating mode, is reduced relative to that when the engine is discriminated to be in the full-cylinder operating mode, thereby reducing the power consumption and operating noise of the fuel pump.

Abstract: A bush incorporated in a common rail is formed with a smallest diameter orifice having a small inner diameter and an adjacent orifice having an inner diameter larger than that of the smallest diameter orifice on an inner peripheral face of the bush. A press-fitted portion, which is press-fitted into an inside-outside communication hole, and a non-press-fitted portion, which has a smaller outer diameter than the press-fitted portion, are formed on an outer peripheral face of the bush. The smallest diameter orifice and the press-fitted portion are deviated from each other in an axial direction of the bush to prevent an overlap in a radial direction of the bush. Thus, even if the bush is tightly press-fitted into the inside-outside communication hole, decrease of the inner diameter of the smallest diameter orifice can be averted.

Abstract: A fuel injector assembly with injector seal retention includes a fuel injector body including an injector nozzle housing disposed at a distal end of the fuel injector body. The injector body is adapted with a grooved portion to securely capture an injector seal to prevent the loss of the injector seal during installation and/or removal of the fuel injector assembly into an engine cylinder head.

Abstract: A fuel supply apparatus for a motor cycle allows the motor cycle to execute rapid jump traveling and accelerated drive just after the jump traveling. A fuel pump (P) and a fuel filter (F) connected to a pump suction path (Pa) of the fuel pump (P) are attached to a lid member (1) closing an opening portion (Ta) of a fuel tank (T). The fuel pump (P) provided with the fuel filter (F) is arranged so as to be inserted into the fuel tank (T) via the opening portion (Ta). The fuel filter (F) is arranged within a filter storage case (C) surrounding an entire outer periphery of the fuel filter (F) in an approximately sealed manner. A fuel supply hole (25) open to an inner side of the fuel tank (T) is pierced in a side wall (Cb1) along a gravity force direction (X) of the filter storage case (C).

Abstract: The invention relates to a fuel injection valve for intermittent fuel injection into the combustion chamber of internal combustion engines. A needle-shaped injection valve member (34) is arranged in the high-pressure fuel chamber (30) adjacent to the injection valve seat (32), said injection valve member co-operating with the injection valve seat (32) and defining, in a piston-type manner, the cylinder chamber (36) which is connected to the high-pressure inlet (26). The booster piston (28) is controlled by means of the control valve (34) embodied as a flat seat valve, increasing the pressure of the fuel in the high-pressure fuel chamber (30) for an injection, and thus lifting the injection valve member from the injection valve seat. In this way, the injection is carried out with increased pressure.

Abstract: A spacer for use with, and to prevent or reduce the occurrence of stiction in, a fluid device such as a pump. The spacer has a generally ring-shaped body, which has first and second facing surfaces separated by a thickness. The spacer is positioned between a movable member of the pump and a stationary member of the pump such that the first facing surface of the spacer is contactable with the movable member and the second facing surface is contactable with the stationary member. The spacer has at least a fluid receiving groove formed in at least one of the first and second facing surfaces.

Abstract: A fuel pump for use in an internal combustion engine comprises a pump housing provided with a plunger bore, a pumping plunger which is movable within the plunger bore by means of a cam drive arrangement to perform a pumping stroke to pressurise fuel within a pumping chamber and a cam follower arrangement interposed between the cam drive arrangement and the pumping plunger so as to transmit a drive force of the drive arrangement to the pumping plunger. The cam follower arrangement includes a timing advance piston for advancing or retarding the timing of the pumping stroke, and control means for controlling the timing advance piston so as to advance or retard the timing of the pumping stroke. The timing advance piston is provided with a groove on its outer surface for receiving fluid, thereby to provide a centralising force to the timing advance piston, in use.

Abstract: A fuel pump controller includes a detecting device for detecting environmental vibrational energy and converting the environmental vibrational energy into an electrical signal. A motor controller is coupled to a fuel pump motor wherein the electrical signal is used by the controller to command the fuel pump motor to operate at one of a plurality of speeds wherein the commanded speed is at least in part a function of the environmental vibrational energy.

Abstract: A fuel system for supplying pressurised fuel to a plurality of fuel injectors (14a-14f) comprises an accumulator assembly (16) having first and second accumulator volumes (18, 20) defined within a common accumulator housing (22), supply means (42) for supplying fuel at a supply pressure level to the first accumulator volume (18) and a plurality of unit pumps (10a-10f). Each unit pump is arranged to receive fuel at the supply pressure level from the first accumulator volume (18) and pressurises said fuel to an injectable pressure level for supply to the second accumulator volume (20). Each unit pump (10a-10f) includes a pumping plunger (50) for pressuring fuel within an associated pump chamber (52) and being integrated with the accumulator housing (22) so as to permit communication between the first accumulator volume (18) and the pump chamber (52) internally within the accumulator housing (22).

Abstract: A fuel feed apparatus connects with an injector and a reservoir tank. The reservoir tank is in upstream of the injector for accumulating fuel for the injector. A fuel pump press-feeds fuel in a fuel tank toward the reservoir tank in accordance with pressure in the reservoir tank. A press-feed pipe defines a fuel passage from the fuel pump to the reservoir tank. A branch pipe is provided to the press-feed pipe. The branch pipe defines a return passage that branches from the fuel passage. Fuel discharged from the fuel pump returns into the fuel tank through the return passage. A throttle unit is provided to the branch pipe for reducing a sectional area of the return passage. A relief valve is provided to the branch pipe for communicating the return passage when pressure in the return passage becomes equal to or greater than relief pressure.

Abstract: A first valve element (32) and second valve element (34) are arranged in a pressure switching chamber (30) of a three-way valve (8). When switching a destination of a fuel flow passage (15) from a high pressure fuel feed passage (5a) to a low pressure fuel return passage (26a), the state where the first valve element (32) is open and the second valve element (34) is closed is switched through a state where the first valve element (32) and second valve element (34) are both closed to a state where the first valve element (32) is closed and the second valve element (34) is open. Fuel pressure of a pressure control port (55) sealed by a sliding seal face (53) formed at an outer circumference of the second valve element (34) is used to control an opening timing of a needle valve (9).

Abstract: The invention relates to an internal combustion engine comprising a fuel supplying device. Said fuel supplying device comprises a low-pressure circuit provided with a low-pressure pump and a high-pressure pump that is coupled to the low-pressure circuit on the input side and transports fuel into a fuel accumulator. A fuel transporting flow of the low-pressure pump is corrected according to an actual and a previously pre-determined nominal value of the fuel pressure in the fuel accumulator.

Abstract: A vehicle fuel supply device including a saddle-shaped fuel tank comprised of a main chamber and an auxiliary chamber. A reservoir is disposed within the main chamber. A main pump is provided within the reservoir. A sub-pump is detachably provided within the reservoir. The fuel in the reservoir is drawn up by an operation of the main pump to supply fuel to an engine. A portion of the drawn-up fuel is utilized to generate a negative pressure, the negative pressure is utilized to transfer the fuel in the auxiliary chamber to the reservoir, and the negative pressure is utilized to introduce the fuel in the main chamber into the reservoir.

Abstract: A leak detecting apparatus includes a canister adsorbing a fuel vapor evaporated in a fuel tank, a measure passage, a pump connected with the canister through the measure passage, and a pressure senor detecting a pressure in the measure passage. The pump depressurizes the measure passage, the canister, and the fuel tank so that a leakage of the fuel vapor is detected. When a blow-by of the fuel vapor is arisen, the pump is stopped to forcibly terminate a depressurization.

Abstract: A damper element for damping pressure pulsations in a liquid includes a first side including a first wall portion at least partially defining a chamber containing a gas and a second side including a second wall portion at least partially defining the gas-containing chamber. The second side is overlappingly joined with the first side such that the first and second wall portions combine to define substantially an entire cross-section of the gas-containing chamber. Both the first and second wall portions are convexly curved outwardly away from the gas-containing chamber.

Abstract: A fuel supply system is incorporated into a diesel engine including a low-pressure fuel pump 2, a high-pressure fuel pump 3, a common rail 4, fuel injection valves 5 and a fuel return line 14. The fuel supply system reduces the discharge rate of the low-pressure fuel pump 2 supplying the fuel to the high-pressure fuel pump 3 when the diesel engine is in an idling state and the temperature of the fuel is below a lower fuel temperature threshold and when the diesel engine is in an idling state and the temperature of the fuel is above an upper fuel temperature threshold. The flow rate of the feed fuel discharged from the low-pressure fuel pump is reduced when an idling state or a specific state where the fuel is at a specific temperature. Thus the fuel line system of the fuel supply system can be built in a lightweight arrangement and the piping of the fuel line system can be simplified.

Abstract: A self-damping fuel rail for a fuel-injected internal combustion engine includes an elongated tube defining a wall and having a longitudinal axis. The wall defines a fuel passageway and has a first wall portion movable between a first position bowed inwardly toward the longitudinal axis when the self damping fuel rail is in a non-operative state, and a second position moved outwardly away from the longitudinal axis when the self-damping fuel rail is in an operative state. The self-damping fuel rail also includes at least one fuel outlet configured to facilitate communication between the fuel passageway and a fuel injector.