Abstract: In a fuel supply apparatus disclosed, a variable displacement mechanism is driven once every two or more reciprocating motions of the plunger of a high-pressure fuel pump to control the delivery flow rate, so that the delivery flow rate control can be performed without having to raise the responsiveness of the variable displacement mechanism even when the reciprocating cycle of the plunger is short.

Abstract: In a fuel injection system for an internal combustion engine with a high pressure pump for supplying pressurized fuel to fuel injection valves and a multi-way valve disposed in the high pressure fuel line to the fuel injector for controlling the fuel flow to the injector, the multi-way valve is a spool valve which includes an actuator for positioning the spool to provide selectively a flow connection between the high pressure pump and the injection valve or between the injection valve and a fuel return line and which further includes an inflow throttle structure forming a pressure control device. A pressure sensor is arranged between the spool valve and the fuel injector and supplies the sensed pressure value to a controller which compares the value with predetermined set values and provides a correction value to the multi-way valve actuator for the correction of the pressure of the fuel supplied to the fuel injection valve.

Abstract: A cam for driving a high-pressure fuel pump has a cam profile that is asymmetric for the suction stroke and the ejection stroke. The cam profile is set so that the cam angle for the ejection stroke is greater than the cam angle for the suction stroke. Therefore, even when the cam drive shaft is rotating at a constant speed, the duration of the ejection stroke becomes longer than the duration of the suction stroke. That is, the changing speed of the capacity of a pressurizing chamber becomes less during the ejection stroke than during the suction stroke.

Abstract: The fuel injection system has a high-pressure fuel pump (10) and a fuel injection valve (12) for a cylinder of the engine. The high-pressure fuel pump (10) has a pump work chamber (22), and the fuel injection valve (12) has an injection valve member (28) by which at least one injection opening (32) is controlled and which is movable in an opening direction (29) counter to the force of a closing spring (44); the closing spring (44) is braced on one end on the injection valve member (28) and on the other end on a displaceable storage piston (50) that is acted upon, on its side remote from the closing spring (44), by the pressure prevailing in the pump work chamber (22). The storage piston (50) is movable into a storage chamber (54) counter to the force of the closing spring (44), and the deflection stroke motion of the storage piston (50) into the storage chamber (54) is limited by a stop (53).

Abstract: A high-pressure fuel supply system can reduce the generation of noise upon opening and closing of an electromagnetic valve. The electromagnetic valve (100) of the high-pressure fuel supply system includes a body (41), a plunger (40) slidably received in the body (41), a valve seat (42) with which an end of the plunger is caused to move into and out of contact so that the valve seat is placed into fluid communication with a fuel pressurization chamber (27) when the plunger is moved apart from the valve seat, a stopper (43) for limiting the distance of separation of the plunger from the valve seat, and a spring (48) for urging the plunger in a direction toward the valve seat. An elastic O ring (101) is provided around the valve seat for absorbing collision sounds generated when the plunger collides with the valve seat.

Abstract: The fuel premetering device has a valve controlled by an electromagnet and located between a delivery conduit of a high-pressure pump supplying fuel to a common rail, and a drain conduit for draining surplus fuel. The valve is normally closed by a spring, and the electromagnet is energized to open the valve in opposition to the spring. The electromagnet is energized by a current varying in response to the operating conditions of the engine, and which is varied by a control unit from zero, at which the valve is closed completely by the spring, to a predetermined value, at which the electromagnet opens the valve completely, so that premetering is self-adaptive.

Abstract: A fuel pump draws pumps fuel from a fuel tank to a pressurizing chamber during a suction stroke, and pressurizes and sends fuel in the pressurizing chamber to a delivery pipe. A electromagnetic valve is actuated by electricity from a battery to electively connects and disconnects the fuel tank with the pressurizing chamber. An ECU determines opening and closing timing of the electromagnetic valve based on the rotation al phase of an engine. When the rotational phase of the engine is not identified, the ECU executes a duty control to cyclically repeat supplying and stopping of current to the electromagnetic valve. The ECU extends a current supplying period in each cycle of the duty control as the voltage of the power supply is lowered. As a result, the electromagnetic valve is reliably closed particularly at each pressurizing stroke, which improves the pressure increasing efficiency of fuel supplied to a fuel injection system.

Abstract: A throttle valve for a high-pressure diesel pump of an injection device of a motor vehicle has at least one piston movable by a medium under pressure against a counter force and has at least one throttle location. A prestage valve in the form of a pressure control valve having a valve body is provided. The pressure control valve comprises a piezo drive. The piezo drive has at least one piezo element. A tappet is connected to the at least one piezo element. The tappet secures the valve body in a closing position. A bushing is provided in which the piston is slidably guided. The bushing has at least one annular groove into which at least one control bore opens.

Abstract: A high-pressure fuel pump which is suitable above all for use in internal combustion engines with direct gasoline injection, in which the pressure surge upon opening of a check valve between the high-pressure line and the pumping chamber of the fuel feed pump is limited by structural provisions.

Abstract: A fuel system comprises a fuel pump arranged to deliver fuel to a single fuel injector. The fuel pump and injector are physically spaced apart from one another, a high pressure fuel line being used to convey fuel between the fuel pump and the injector. The fuel pump is controllable to control the timing of commencement of fuel pressurization. The injector is controllable to control the timing of fuel delivery. A controller is arranged to control the operation of the fuel pump and the injector. The invention further relates to a fuel pump suitable for use in such a fuel system.

Abstract: In order to provide a method for high volume and high pressure operation of a variable delivery type single cylinder plunger pump, the displacement of the piezoelectric element 20 is magnified by a hydraulic displacement magnifying mechanism comprising a large-diameter bellows 204, a small diameter bellows 202 and working fluid 208, and an engaging member 201 is displaced to control the time interval of opening and closing the intake valve 5. The large-diameter bellows 204 is used at all times in the state compressed in the direction of displacement transfer, thereby ensuring that the pressure of the working fluid 208 is maintained at a positive value to prevent vapor from being generated.

Abstract: The electromagnetic valve for use in a high pressure fuel supply apparatus includes an electromagnetic valve main body including a fuel passage to be connected between the high and low pressure sides of the fuel supply apparatus, a valve seat disposed in the fuel passage, a valve member disposed within the electromagnetic valve main body in such a manner that it is detached from and contacted with the valve seat to thereby open and close the fuel passage, and a solenoid coil for moving the valve member with respect to the valve seat. The electromagnetic valve is capable of maintaining the jet-out quantity of the fuel from the high pressure fuel supply apparatus at a given value.

Abstract: A fuel system arranged to deliver fuel at high pressure to a fuel injector through a high pressure fuel line defined, at least in part, within first and second housing parts of a pressure relief valve arrangement. The first and second housing parts define first and second separable valve surfaces respectively. A clamping arrangement is provided for applying a clamping load to the first and second housing parts so as to urge first and second valve surfaces respectively thereof into substantially sealing engagement. The clamping arrangement is arranged to permit separation of the first and second valve surfaces in the event that fuel pressure within the high pressure fuel line exceeds a predetermined amount, thereby to permit fuel within the high pressure fuel line to flow to a region of relatively low pressure to relieve fuel pressure within the high pressure fuel line.

Abstract: A high pressure fuel pump, to suppress the effect of a pressure pulsation caused by the operation of a moving member and whose valve part shows stable response, has a flow amount control valve for adjusting the supply amount of fuel discharged by the sliding reciprocating movement of a plunger fitted in a pump chamber by controlling the opening or closing of a spill port by a valve part, the flow amount control valve has a stem part arranged in an operating chamber disposed on the side opposite to the pump chamber and transmits an urging force from a moving part to the valve part, the urging force being applied by the moving part to the valve part in the direction that separates the valve part from the valve seat, and is more slender than the moving part.

Abstract: A high pressure fuel supply apparatus is constituted by a plunger reciprocating in a sleeve of a high pressure fuel pump so as to form a fuel pressurizing chamber between the plunger and the sleeve, a suction valve provided in a fuel suction port for sucking fuel into the fuel pressurizing chamber, and a discharge valve provided in a fuel discharge port for discharging fuel from the fuel pressurizing chamber into a high pressure fuel discharge passageway communicating with an internal combustion engine, the discharge valve reciprocating axially so as to perform an open/close operation, wherein the high pressure fuel supply apparatus further comprises a holder for regulating an axial reciprocating movement of the discharge valve in the open/close operation within a predetermined range.

Abstract: A pressure control valve for a high-pressure diesel pump of an injection device of a motor vehicle has a valve body and a piezo drive with a tappet securing the valve body in a closed position. The valve body in the closed position closes off a bore, containing a medium under pressure, relative to a pressure-relief bore. The piezo drive has at least one piezo element connected to the tappet. The piezo drive is mounted in a pump housing of the high-pressure diesel pump. A screw element receives the piezo drive and is used to screw the piezo drive into the mounting chamber of the pump housing.

Abstract: In an injection system for an internal combustion engine, having one fuel pump per engine cylinder to be supplied of the engine, the pump being controlled electronically, having an injection nozzle that is provided with a nozzle needle, and having a connecting line between the fuel pump and the injection nozzle, it is an object for the injection course to be freely selectable. To this end, the injection nozzle is provided with an electronically controlled valve, which is capable of controlling the opening of the nozzle needle.

Abstract: A fuel injector pump in a direct-injection fuel delivery system for an internal combustion engine including a solenoid valve for controlling transfer of fluid from a high pressure chamber to a fuel injector nozzle. A supply passage and a return passage provide a fuel flow circuit for the fuel delivery system, the high pressure chamber being defined in part by a camshaft-driven plunger. An independent fuel leak flow path is provided to accommodate fuel leakage past a plunger of the pump, the fuel leak flow path extending to a zero pressure fuel tank.

Abstract: An air intake device of an internal combustion engine comprises a cylinder head having therein two intake ports that are adapted to connect to a cylinder of a cylinder block; and a single partition plate that extends across both the two intake ports so that each of the two intake ports is divided into first and second air passages.

Abstract: A lift-controlled valve as a fuel metering device of an injection system for internal combustion engines has a valve needle (11) which may be actuated axially against the resistance of a spring (24), the valve needle being situated in a graduated coaxial recess (13) in a valve body (10) and interacting with a valve seat (17) formed in the recess (13) of the valve body (10)—in this case controlling the fuel injection process; the valve has in addition a high-pressure area (18) which is connected to an assigned injection nozzle and which is located upstream from the valve seat (17), a low-pressure area (28) which is located downstream from the valve seat and which opens out into a fuel return flow(30), and a low-pressure equalizing piston (22) which coaxially adjoins the valve (16, 17) and which is fixedly connected to the valve needle (11).

Abstract: The valve (16) has a ball shutter (18) normally pushed by a helical compression spring (24) to close a delivery conduit (11) of the pump (5). A first end (28) of the spring (24) rests against a shoulder (26) of a fastening member (21) fitted in fluidtight manner to the pump (5); a second end (31) of the spring (24) acts directly on the ball (18); the fastening member (21) has a pin (33) coaxial with the conduit (11) and of such a length as to limit the travel of the ball (18) to a predetermined value; and the second end (31) of the spring (24) has at least one small-diameter turn (34) by which to engage the ball (18).

Abstract: The present invention finds application in engines using mechanically actuated electronically controlled fuel injectors having direct control needle valves. In valves such as these, a spill control valve member controls fuel pressurization within the injector while a needle control valve member controls the timing and duration of the injection event. However, when the momentum of fuel exiting the fuel injector past the spill valve is greater than that of the tappet and plunger moving toward their downward positions, engine components upstream of the tappet can briefly separate and re-engage, which can result in increased mechanical noise levels. Therefore, the present invention is directed to maintaining sufficient contact force in the various engine components to reduce the mechanical noise levels by positioning a flow restriction between the fuel pressurization chamber of the fuel injector and a fuel source.

Abstract: An engine has cylinders, a fuel injection unit with a valve operable in response to a valve control signal to cause fuel to be injected into the cylinders, and a control unit which generates the valve control signal. A method of controlling the valve includes sensing a time associated with movement of the valve corresponding to start of a fuel injection event, and modifying the valve control signal as a function of the sensed time. The method further includes determining a rise time of the valve control signal, determining a valve operation delay time as a function of the rise time, determining a difference time representing a difference between a desired valve operation time and the sensed time, comparing the valve operation delay time to the difference time, and adjusting timing of the valve control signal as a function of the comparison.

Abstract: An electronically-controlled fuel injector includes a pressurized fluid chamber that communicates high pressure fluid to first and second pressure control chambers. A direct-operated check moves between closed and open positions in response to a difference in fluid pressure in the first and second pressure control chambers. A first thermally pre-stressed bender actuator is used to operate a control valve that controls fluid communication between the fluid chamber and a fluid source. A second thermally pre-stressed bender actuator is used to operate a control valve that controls the fluid pressure in the first pressure control chamber to effectively control opening and closing of the check during portions of an injection sequence.

Abstract: An engine is provided comprising an engine housing defining at least one cylinder. At least one engine auxiliary system is attached to the engine housing and has a different portion associated with each engine cylinder. Each different portion of the engine auxiliary system has a first electrical actuator coupled to a first valve and a second electrical actuator coupled to a second valve which are wired in series. For example, a fuel injection system is provided with a first electrical actuator operably coupled to a fuel pressurizer and a second electrical actuator operably coupled to a direct control needle valve. The electrical actuators are wired in series on an electrical circuit. A method of controlling a portion of the engine auxiliary system is also provided which consists of actuating a first electrical actuator with a relatively low current and actuating a second electrical actuator with a relatively high current.

Abstract: The invention relates to an arrangement for injecting fuel, which is at high pressure, into an internal combustion engine. An injector (25) encloses a pressure chamber (1), from which a high-pressure line (3) discharges into a control chamber (4) of a nozzle needle (5). Also contained in the injector (25) are two control valves (11, 12), which on the outlet side communicate with regions (9) of a lesser pressure level. One of the control valves (11, 12) that form the injection course (20) contains a pressure compensation system (34), by which the injection pressure course (20) can be varied by varying the stroke length (23) of the nozzle needle (5).

Abstract: A fuel injection apparatus for internal combustion engines is proposed, which has a high-pressure fuel source from which fuel is supplied to an injection opening by means of a control valve unit. The control valve unit has a valve body, a valve member disposed in an axially mobile manner inside this valve body, and an actuator unit that actuates the valve member. A first high-pressure line connected to the high-pressure fuel source feeds into a first valve chamber of the control valve unit. In addition, a first valve seat is provided on an outer diameter of the valve body between the first valve chamber and a second valve chamber that communicates with the injection opening by means of a second high-pressure line. A second valve seat is formed on an inner diameter of the valve member and is engaged by a closing device.

Abstract: The fuel injection apparatus has a high-pressure fuel pump and a fuel injection valve connected to it for each cylinder of the internal combustion engine. A pump piston of the high-pressure fuel pump is set into a stroke motion by the engine and defines a pump working chamber that is connected to a pressure chamber of the fuel injection valve, which has an injection valve member that controls at least one injection opening and can be moved in an opening direction by the pressure prevailing in the pressure chamber, counter to a closing force.

Abstract: A vehicle, including watercraft and personal watercraft, includes a hull, an engine system and a propulsion system. The engine system comprises an internal combustion engine and an air intake for receiving air to be mixed with fuel supplied to the engine. The propulsion system connects to the engine and propels the watercraft along a surface of a body of water using power from the engine. The watercraft can include a quick connect air/water separator, or air box. A fuel system is provided that has a fuel supply line and a fuel return line which are connected with a bypass line. For evacuating fuel from the supply line and the return line, the bypass line contains a valve which can be actuated to allow fuel to flow into the fuel reservoir. A lubrication system is provided that includes a filler neck comprising an oil/air separator which allows a mixture of oil and air to be separated and the oil to be returned to the oil reservoir.

Abstract: Disclosed is a fuel injection system, in particular a common rail system, for fuel delivery in internal combustion engines, in particular diesel engines of commercial vehicles, with a low pressure circuit in which at least one low-pressure feed pump supplies fuel from a fuel tank to a high-pressure pump which supplies the highly pressurized fuel to a central high-pressure fuel reservoir. In order to simplify the ventilation of the low-pressure circuit, a device is provided for intentionally decreasing the pressure in the low-pressure circuit.

Abstract: A high pressure pump includes a cylinder body. The cylinder body has a cylinder and a valve recess communicated with the cylinder. A cover is attached to the cylinder body to surround the valve recess. A plunger reciprocates in the cylinder. An electromagnetic valve has a pressurizing chamber, a valve hole connected to the pressurizing chamber and a valve body. The valve body selectively opens and closes the valve hole. The electromagnetic valve is fixed to the cover. When fluid is pressurized in the pressurizing chamber, the valve hole is closed by the valve body and the plunger enters the pressurizing chamber. A seal ring is located between an outer surface of the electromagnetic valve and an inner surface of the valve recess. The seal ring seals the pressurizing chamber. This reliably seals a pressurizing chamber and improves the displacement efficiency.

Abstract: A variable delivery fuel supply device capable of improving linearity of discharge characteristics with respect to a rotational angle of a cam and reducing abrasion of the cam.

Abstract: A variable delivery type fuel supply apparatus capable of suppressing variation of fuel pressure within a delivery pipe and hence variation of fuel quantity injected through fuel injection valves and simplifying a control method therefor. The apparatus includes an oil relief passage (6) provided between the suction port of a fuel pump (4) and a pressurizing chamber (4e) across a suction valve (4a) of the fuel pump (4), an electromagnetic valve (7) disposed in the oil relief passage (6) and opened for a predetermined time during a discharge stroke of the fuel pump (4) for thereby controlling a discharge quantity of the fuel pump (4), and a control unit (108) for controlling the timing at which the electromagnetic valve (7) is opened.

Abstract: A high pressure fuel supply apparatus is constituted by a plunger reciprocating in a sleeve of a high pressure fuel pump so as to form a fuel pressurizing chamber between the plunger and the sleeve, a suction valve provided in a fuel suction port for sucking fuel into the fuel pressurizing chamber, and a discharge valve provided in a fuel discharge port for discharging fuel from the fuel pressurizing chamber into a high pressure fuel discharge passageway communicating with an internal combustion engine, the discharge valve reciprocating axially so as to perform an open/close operation, wherein the high pressure fuel supply apparatus further comprises a holder for regulating an axial reciprocating movement of the discharge valve in the open/close operation within a predetermined range.

Abstract: A method and system for injecting fuel in at least two different high fuel pressures via injectors into a combustion chamber of an internal combustion engine. The higher fuel pressure being stored in a central pressure reservoir, the lower fuel pressure is generated individually locally for each injector, at all times during the injection event by diversion of the higher fuel pressure. The diversion being activatable or deactivatable via a multi-way valve. To that end, a corresponding fuel injection system with a central pressure reservoir for storing the higher fuel pressure has a local diversion unit for each injector by means of which the lower fuel pressure can be generated dissipatively from the higher fuel pressure, and the local diversion unit has a multi-way valve for activating and deactivating the diversion, respectively. In this way, an improved metering of the lower fuel pressure can be achieved.

Abstract: A pressure limiter is connected fluid-tight between a common rail having an accumulator for storing high-pressure fuel delivered from a high-pressure fuel feed pump and a relief line. In a valve body of this pressure limiter, a damper chamber is provided on the downstream side of the sliding bore, for housing a large diameter portion of the piston and holding fuel, to thereby control the downward speed of the ball valve and the piston when the ball valve and the piston are shifted to the valve closing side by the force of the spring. Thus it becomes possible to prolong the downward-moving time of the ball valve and the piston.

Abstract: Fuel injectors are disclosed for use in internal combustion engines including a housing which includes a working chamber, a piston, including a plunger, for reciprocal movement within the working chamber, a hydraulic valve having one side facing the control chamber and the other side facing a poppet chamber, and including a poppet defining the poppet chamber in communication with an inlet port and the working chamber, the poppet providing a throttling slot between the working chamber and the poppet chamber, a spring urging the hydraulic valve towards the closed position, a control valve between the control chamber and the spill port, and a bypass channel between the poppet chamber and the control chamber, whereby during initial movement of the hydraulic valve from its closed position to its open position the primary bypass channel is closed and when the hydraulic valve reaches an intermediate position the primary bypass channel is open.

Abstract: In a pressure increasing type injector, a fuel pressure increasing chamber is communicated via a pressure relief passage, a recessed portion, a communication hole, a hollow portion and a bypass passage with a pressure release portion. A ball valve disposed within the recessed portion interrupts the communication between the recessed portion and the pressure relief passage at the start of fuel injection, and communicates the recessed portion with the pressure relief passage at the end of the fuel injection. Consequently, an injection ratio is increased gently at the start of the injection, and the fuel within the fuel pressure increasing chamber flows out therefrom to a pressure release portion when the valve is closed. Accordingly, an injection port can be closed rapidly and therefore the injection ratio is lowered abruptly.

Abstract: A valve body of a spill valve is constructed of steel having a martensitic structure and a needle constructed of steel in which hard particles are dispersed in a matrix having a martensitic structure. A hardness difference between the matrix and the hard particles is equal to or smaller than 1000. By reducing the difference in hardness between the matrix and the hard particles of the needle, projections and detachment of hard particles are prevented. Accordingly, the wear of the matrix and valve body resulting from exposed hard particle is precluded while ensuring hardness of the valve.

Abstract: In a fuel injection valve for a pump-line-injector system of an internal combustion engine, comprising a fuel injector with a nozzle body, a nozzle needle longitudinally movably supported in the nozzle body between a seated nozzle closing position and a lift-off position assumed during fuel injection, the nozzle includes a fuel supply passage, a fuel drain passage, a connecting passage extending from the fuel supply passage to the fuel drain passage, and a spring-loaded pressure relief piston forming a control valve disposed in the path of the pressurized fuel from the fuel supply passage to the drain passage for controlling the pressure of the fuel supplied to the nozzle needle during fuel injection into a cylinder of the internal combustion engine.

Abstract: The invention relates to a control unit for an injection system for fuel, having a control part movable between a valve seat and a stop face of a bore in the housing. A high-pressure line discharges into a bore that penetrates the housing and receives the control part. A control face of the control part opposite the valve seat acts in the higher rpm range as a throttle element for filling a pump chamber in the housing.

Abstract: In a method for operating a Diesel engine with a pump-line-nozzle injection system, which allows the pressure level to be raised in the lower and intermediate engine speed ranges in relation to a predetermined maximum permissible injection pressure without this maximum permissible injection pressure being exceeded in the upper engine speed range by providing an injection pump designed to deliver the desired fuel injection pressure at low and intermediate engine speeds and including a pressure relief valve in the fuel injection line permitting limiting of the fuel injection pressure at higher engine speeds.

Abstract: A fuel injector assembly is provided which includes a pressurization control valve assembly and a timing control valve assembly. A pressure actuated needle valve is positioned between the pressurization and timing control valves. Pressure within the injector is controlled by opening and closing such valve assemblies. In particular, when the pressurization control valve assembly is open and the timing control valve is closed there will be pressure equilibrium within the injector and a spring will hold the needle valve closed. When the pressurization and timing control valves are both closed, fuel in the injector will be pressurized. Upon opening the timing control valve assembly, there will be a net upward force which will open the needle valve. Closing of the timing control valve assembly will create a net downward force closing the needle valve.

Abstract: The capacity of a high-pressure pump (6) is regulated by a valve system including a variable-capacity on-off valve (23) and an overpressure valve (31). The overpressure valve has a valve body (33) having a cylindrical wall (35) forming a cavity (34) in which slides a shutter (37) having a lateral wall (51) and an end wall (52). The shutter (37) is pushed into a closed position by a calibrated spring (58). The cylindrical wall (35) has first holes (44) for allowing the passage of enough fuel to lubricate the inside of the pump (6), and second holes (47) for supplying the pump (6) via a supply conduit (68) and for draining any surplus fuel into a recirculating conduit (32). The first holes (44) and the second holes (47) are opened by different displacements of the lateral wall (51) of the shutter (37); and the end wall (52) has a calibrated air vent hole (64).

Abstract: When a pump operates, a check valve body leaves a check valve seat due to a pump side fuel pressure for opening a fluid passage inside a pressure adjusting valve body. When the pump does not operate, the check valve body contacts the check valve seat due to an engine side fuel pressure for closing the fluid passage. Thus, the engine side fuel is prevented from flowing-back to the pump. When the pump stops operating and the engine side fuel pressure exceeds a pressure corresponding to an urging force of a coil spring, the pressure adjusting valve body leaves the pressure adjusting valve seat with the check valve body, so that a gap is provided between the pressure adjusting valve body and the pressure adjusting valve seat for releasing the engine side fuel having excess pressure.

Abstract: A pressure valve having a valve body inserted into a bore of a valve housing. The valve body on one end that has plunged into the valve housing has a valve seat face in contact with a movable valve member which can be seated by a restoring force and which is adjoined by a through conduit. The movable valve member penetrates the valve body, for the sake of simpler axial securing of the valve body in the valve housing and also for easier dismantling, the valve body is secured axially in the valve housing via a detent connection.

Abstract: In a flow amount control device which control flow amount of fuel to be supplied to a high pressure fuel pump, an opening, which communicates with a port for passing fuel to the high pressure fuel pump, is composed of a first rectangular opening, a second rectangular opening whose circumferential length is larger than that of the first opening, and a third trapezoidal opening bridging between the first and second openings. The port communicates with the first opening, when engine speed is low, and, as the engine speed increases, with the third and second openings. Accordingly, the flow amount of fuel to be discharged from the high pressure fuel pump varies non-linearly and a change of the flow amount thereof is small in engine low speed region.

Abstract: For each cylinder of the internal combustion engine, the fuel injection system has one fuel pump, one fuel injection valve, and one line connecting the fuel injection valve to the fuel pump. To control the injection, a first electrically triggerable control valve is disposed on the fuel pump, by which valve a communication of the high-pressure side of the fuel pump with a relief chamber is controlled. The onset of fuel injection is determined by the closing time of the first control valve, by which the high-pressure side is disconnected from the relief chamber. Near the fuel injection valve, a second electrically triggerable control valve is disposed, by which a communication of the fuel volume, located in the fuel injection valve, with a relief chamber is controlled. The end of the fuel injection is determined by the opening time of the second control valve, and as a result rapid relief of the fuel volume located in the fuel injection valve and thus rapid closure of the fuel injection valve are achieved.

Abstract: A fuel system, for use in supplying pressurised fuel to a combustion space, comprises a fuel source of pressurised fuel and a fluid pressure actuable valve controlling communication between the fuel source and an injection nozzle. The fuel system further comprises a second source of control fluid under pressure and a control valve controlling the application of control fluid under pressure to the fluid pressure actuable valve to control operation of the fluid pressure actuable valve. The invention also relates to a fuel injector for use in such a fuel system, the fuel injector comprising the injection nozzle, the fluid pressure actuable valve and the control valve.

Abstract: The fuel injection apparatus has one fuel pump for each cylinder of the engine, which pump has a pump piston, driven by the engine in a reciprocating motion, that defines a pump work chamber, which communicates via a line with a fuel injection valve, disposed on the engine separately from the fuel pump, which valve has an injection valve member, by which at least one injection opening is controlled, and which is movable in the opening direction, counter to a closing force, by the pressure generated in the pump work chamber, and at least one first electrically triggered control valve is provided, by which a communication of the pump work chamber with a relief chamber is controlled, and which is disposed near the fuel pump.