Abstract: The injection valve has a control valve with a control chamber in which a closing member is disposed. The closing member is pressed against a corresponding sealing seat by a pressure (e.g. fuel pressure) in the control chamber. The closing member merges into a rod that passes through a drain hole and is connected to a spring plate. The spring plate is preloaded against the housing by a compression spring in such a way that the closing member is pressed against an associated sealing seat. The closing member can be raised from the sealing seat by an actuator piston which rests against the spring plate.

Abstract: A hydraulically actuated fuel injector includes an injector body that defines a high pressure passage, a low pressure passage, a control passage, a fuel inlet, and a nozzle outlet. The injector body includes upper surface and a lower surface that partially define an armature cavity. The injector body also defines a fluid displacement passage that is separated from the upper surface and the lower surface and extends between the armature cavity and a low pressure area. The fluid displacement passage is positioned and sized such that an amount of oil is always maintained in the armature cavity at least to a level below the fluid displacement passage but above the lower surface. In addition, the fluid displacement passage is sized and positioned to ensure adequate drainage for cold start, yet provide a flow restriction especially at idle conditions to produce sufficient valve damping that a substantial reduction in impact noise occurs.

Abstract: A fuel injector includes first and second valves and a solenoid including a solenoid coil and an armature assembly wherein the first and second valves are coupled to the armature assembly. A solenoid drive circuit is coupled to the solenoid coil and delivers a first current waveform portion to the solenoid coil at a first time to cause the armature assembly to operate the first valve without operating the second valve. A second current waveform portion different than the first current waveform portion is applied to the solenoid coil at a second time later than the first time to operate the second valve.

Abstract: The present invention is a control device and a control method for a cam driving type electronic control unit injector, in which driving force transmitting parts do not separate from a cam even when a high injection pressure is used.

Abstract: The integrated pressure pulsation damper and hot soak pressure valve lies normally open adjacent the fuel rail and damps fuel pressure pulsations during engine operation caused by opening and closing of the fuel injectors. When the engine is turned off, and a hot soak condition occurs, the valve automatically closes to retain a high fuel pressure in the fuel rail to facilitate hot restarts. Upon restarting the engine, the valve reverts to its normally open condition, serving as a pressure pulsation damper.

Abstract: A device for injecting high pressure atomized fuel liquid into the combustion chamber of an internal combustion engine such as a diesel engine. The device includes a mechanism for delivering high pressure liquid fuel (16) such as a pump. The mechanism communicates via a cyclic communication device with an injection chamber (26) of variable volume having a movable element (27) returned by a resilient returning element (28) towards a stop (33), and communicates permanently with the nozzle cavity (10). The amount of liquid fuel is delivered to the injection chamber during the cyclic closing phase of a nozzle obturator (14).

Abstract: The invention proposes a fuel injection valve for internal combustion engines, having a valve member (11), which can be displaced axially outward in a bore (9) of a valve body (1) counter to the force of a closing spring (47) and which on its end toward the combustion chamber has a closing head (13), protruding from the bore (9) and forming a valve closing member, that on its side toward the valve body (1) has a valve sealing face (15) with which it cooperates with a valve seat face (17) disposed on the end of the valve body (1) toward the combustion chamber, and having at least one injection opening on the closing head (13) which originates at a pressure chamber (19) and whose outlet opening is covered by the valve body (1) in the closing position of the valve member (11) and is uncovered in the outward-oriented opening stroke.

Abstract: A fuel rail has a high pressure inlet and a low pressure outlet. The high pressure inlet feeds pressurized fuel to a plurality of injectors along the fuel rail. A fuel return line, which is connected with the low pressure outlet, is positioned substantially centrally of and coaxial with the fuel rail. The fuel return line is non-circular in configuration having a width to height ratio greater than one. The configuration of the return fuel line and the flexibility of the walls thereof provide a damper that reduces the pressure pulsations in the high pressure fuel.

Abstract: A control valve for an injection valve for injecting fuel into an internal combustion engine is described. The injection valve has a control chamber which is connected via an inlet throttle to a high-pressure accumulator, and which can be connected via the control valve and an outlet throttle to an unpressurized return line to a fuel tank. The pressure prevailing in the control chamber acts on a movable nozzle body which is provided with a nozzle needle which releases and seals injection holes as the nozzle body moves. The control valve is constructed adjoining the control chamber, with the result that the pressure prevailing in the control chamber at a first operating surface also acts on the valve body of the control valve. The control valve has a valve chamber which is disposed opposite the control chamber and is connected to the control chamber via the outlet throttle and has a second operating surface, which is smaller than the first operating surface.

Abstract: The plunger pump according to the present invention discharges fuel by reciprocation of a plunger, and comprises metallic diaphragm type dampers, provided at a fuel inlet side and a fuel outlet side, respectively, for reducing pressure pulsation of fuel. Each metallic diaphragm type damper comprises a pressure chamber for receiving fuel pressure, a back pressure chamber into which gas is charged, and a metallic diaphragm for defining the pressure chamber and the back pressure chamber. Since the metallic diaphragm type dampers are provided at the fuel inlet side and the fuel outlet side, respectively, noise and vibration caused by pressure pulsation are reduced at the fuel inlet side and the fuel outlet side. Also, since the diaphragms are metallic diaphragms, deterioration thereof generated by fuel liquid and back pressure gas is low, reliability is high, and the lifetime is long.

Abstract: A fuel injection system includes a fuel body having a compact fuel chamber connected through individual flexible fuel tubes with separate fuel injectors mounted on the separate cylinder inlet passages of an engine. The system may have an integral fuel pressure regulator or the regulator may be located separately, for example with the fuel pump in a vehicle fuel tank. The pressure regulator may include a unitized diaphragm and valve assembly which may be dropped into a housing with a valve seat in the fuel body and enclosed by cover and spring means to form an integrated system. The unitized assembly can also be used in other applications. Pulsation damping may be provided by a flexible wall of the fuel chamber. The flexible wall may be the pressure regulator diaphragm or a resilient wall designed for the purpose.

Abstract: A fuel injection valve which is provided for high pressure injection in self-igniting internal combustion engines and has a solenoid valve for controlling the injection. To trigger this solenoid valve, a control circuit is provided which is subdivided into a first circuit part and a second circuit part. The second circuit part is separate from the first circuit part, which jointly serves to control a number of injection valves, and are disposed on each individual injection valve. The housing is clipped onto the fuel injection valve and fuel flows through its interior for cooling purposes.

Abstract: A delivery valve includes a body defining a chamber into which from one end thereof extends a tubular support member. The interior of the member is connected to the outlet of a fuel pump and an outlet extends from the chamber to a fuel nozzle. Slidable about the support member is a first valve element which defines a seating in its end presented to the other end of the chamber. A second valve element is provided for engagement with the seating and a spring urges the first valve element into engagement with the second valve element. The first valve element also defines a surface against which the fuel pressure in the interior of the tubular member can act to lift the first valve element away from the second valve element to allow fuel flow from the outlet.

Abstract: The present invention relates to a fuel pump assembly for a motor vehicle, the assembly being characterized by the fact that it comprises a damping device (42) formed on the outlet of a pump (20) by a sleeve made of compressible material.

Abstract: A hydro-mechanical device and methods therefor, for receiving fuel from a variable displacement fuel pump of a fuel-supply system and delivering the fuel to a common rail of the fuel-supply system, regulates the fuel-pressure in the fuel-supply system, at least in part, based on the output of the fuel pump such that optimal engine performance can be maintained under varying operating conditions.

Abstract: A fuel injection system that can be used in a diesel engine is provided. The system includes a first accumulator for storing high-pressure fuel and a second accumulator for storing low-pressure fuel sufficiently lower in pressure than the fuel stored in the first accumulator. There is a first two-way electromagnetic valve disposed in a first fuel passage connecting the first accumulator with a fuel injection nozzle. A flow control apparatus controls a flow rate of fuel passing through a second fuel passage connecting a downstream side of the first two-way electromagnetic valve in the first fuel passage with the second accumulator. The flow control apparatus is placed in the second fuel passage. A second two-way electromagnetic valve is placed in a third fuel return passage which connects the fuel injection nozzle with a fuel tank. The second two-way electromagnetic valve switches the fuel injection modes of the fuel from its injection mode to its uninjection mode or vice versa.

Abstract: A marine fuel tank pump comprises a container for assembly into a marine fuel tank. An electric fuel pump is housed in the container. The pump has an inlet receiving fuel from the tank and an outlet. A pressure release is operatively associated with the outlet for releasing pressure from the outlet into the fuel tank when the pump is deenergized.

Abstract: An injector unit consists of a housing (1), of a controllable piston pump (5) and of an injection nozzle (4) adjoining the latter and having a nozzle chamber (25), the housing (1) possessing a fuel supply chamber (23) fed from outside and a return orifice (24) leading outward, the piston pump (5) possessing a pump piston bush (6) which is guided on a pin (20) fixed relative to the housing and which has control orifices (17), and the pin (20) containing a first longitudinal bore (39) leading from the interior (18) of the pump piston bush (6) to the injection nozzle (4). In order to improve sealing and through flow, the pump piston bush (6) is surrounded by a sealing sleeve (50), the pin (20) has a second longitudinal bore (57) and the sealing space (53) is flow-connected to the return orifice via a second transverse bore (58) and a third longitudinal bore (59) in the pin (20).

Abstract: During a transitional operation of an engine in which an engine load is changed suddenly from a high load to a low load, a control operation for extending an opening period of a change-over valve which is adapted to switch a low-pressure accumulator and a high-pressure accumulator from one to the other during a fuel injection operation is carried out to increase a flow rate of a fuel supplied to the low-pressure accumulator and thereby reduce the pressure in the high-pressure accumulator, whereby a response delay of the fuel pressure in the high-pressure accumulator is minimized.

Abstract: A fuel injection system for internal combustion engines is proposed which supplies fuel injection valves with fuel from a high-pressure fuel source, under the control of a control unit. The fuel injection valve has an injection valve member, whose opening or closing position is determined by a pressure that acts upon this injection valve member and that is set in a control chamber. To that end, to perform an injection, the pressure in the control chamber must be relieved; which is achieved with a control valve that opens two different outflow cross sections of an outflow conduit of the control chamber in succession. This makes it possible to accomplish an adapted opening of the fuel injection valve member for a preinjection and for a main injection.

Abstract: A fuel injection event controller for a fuel injection nozzle includes a hydraulic lock device for selectively restricting the translatory opening of a fuel injection nozzle needle valve, the needle valve delivering a quantity of a fuel to a combustion chamber of an internal combustion engine. Methods of effecting rate shaping of the injection charge and of providing a two stage injection event are included.

Abstract: A pump system for preventing hot start knock in a diesel engine following engine shut down carried by fuel leakage into one or more of the combustion chambers of a multiple-cylinder internal combustion engine equipped with a fuel system including open nozzle injectors connected with a common rail. The system includes a transfer pump (46) in fluid communication with the common rail (50) and the fuel tank (48) for pumping fuel out of the common rail and into the fuel tank. A transfer pump control module (82) is provided for actuating the transfer pump (46) for a period of time following engine shut down to remove a sufficient amount of fuel from the common rail to prevent fuel from leakage through the open nozzles. The control system module may include a timer (96) and a voltage sensor (86) to sense condition of a fuel shut off valve (64). A retrofit kit (FIG. 5) is provided including a control module bracket (98) and a transfer module bracket (102).

Abstract: A fuel injection system having a common rail pressure reservoir filled with high-pressure fuel and having a dual-fuel injector for a bi-fluid injection of fuel and an additive fluid into an internal combustion engine. The system includes a first 2/2-way valve in the injection line between the common rail pressure reservoir and a pressure chamber encompassing the injector needle of the dual-fuel injector as well as a second 2/2-way valve, whose inlet is connected via a supply line to the injection line at a point between the first 2/2-way valve and the pressure chamber, and whose outlet is connected to the low-pressure fuel side by way of an outlet line. As a result, the otherwise conventional 3/2-way solenoid control valves, which are significantly more complex technically, can be replaced by more reasonably priced 2/2-way valves. At the same time, this raises the possibility of shifting the quantity metering for additive fluid to a single metering valve that serves an entire group of injectors.

Abstract: A fuel system damper for damping fuel pressure pulsations in a fuel rail includes a solid, flexible diaphragm which separates an upper chamber from a lower chamber. The upper chamber is sealed and contains a spring which is biased against the diaphragm. The lower chamber has an outlet to permit fuel to communicate with the diaphragm. The upper flange of the lower chamber extends inward at an angle to form a radial shoulder, and the diaphragm rests against and is supported by the shoulder. An attachment clip is fixedly attached between the upper and lower chambers and is positioned to securely engage the damper to a fuel injector cup.

Abstract: In a fuel injector for direct fuel injection into a cylinder of an internal combustion engine under the control of an electromagnetic valve, wherein an injector housing has a control piston and a valve body disposed in a cylindrical opening formed therein whereby the high pressure fuel supply to a nozzle valve at one end of the injector is controlled, the valve body forms a valve whose downstream end is in communication, by way of a throttle structure, with a low pressure fuel return line through whichfuel under pressure can be released, the discharge of fuel from the downstream end of the valve body to the return line being further controlled such that fuel can be discharged to the fuel return line only when the nozzle valve is closed.

Abstract: A hydraulically-actuated fuel injector includes an injector body that defines an actuation fluid inlet, a first actuation fluid passage, a second actuation fluid passage, a fuel inlet and a nozzle outlet. A solenoid actuated control valve is attached to the injector body and includes a spool valve member moveable between a first position and a second position. The actuation fluid inlet is closed to the first actuation fluid passage and open to the second actuation fluid passage when the spool valve member is in its first position. The actuation fluid inlet is open to the first actuation fluid passage and closed to the second actuation fluid passage when the spool valve member is in its second position. A piston is positioned in the injector body and moveable between a retracted position and an advanced position. The piston has an upper end exposed to fluid pressure in the first actuation fluid passage.

Abstract: A fuel injection device for internal combustion engines in which the motion of a fuel injection valve member is controlled by the pressure in a control chamber. The pressure in the control chamber is controlled by a control valve whose valve member is actuated by way of a hydraulic chamber, with the pressure transmitted from a piezoelectric drive device. The valve member is provided with two sealing surfaces that cooperate with oppositely disposed first and second valve seats wherein when the valve member moves from the first valve seat to the second valve seat, a short-term relief of the control chamber takes place in order to trigger a short pre-injection of fuel. For larger fuel injection quantities, the control valve is brought into an open position between the first and second valve seats or in a closed position.

Abstract: A fuel supply apparatus having a cross sectional area S.sub.0 of a first low pressure fuel passage which is connected to a high pressure pump and which has a pressure regulator, a cross sectional area S.sub.1 of an orifice formed between the first low pressure fuel passage and a second low pressure fuel passage, and a cross sectional area S.sub.2 of the second low pressure fuel passage for supplying the low pressure fuel to the first low pressure fuel passage. Those cross sectional areas are set to satisfy a relationship of S.sub.1 <S.sub.0 <S.sub.2 such that the pressure pulsation generated at the pressure regulator is reduced, and the noise produced by the fuel supply apparatus is reduced.

Abstract: A bounce depression device 29 for a high speed poppet valve 11 in a electronically controlled hydraulically operated unit fuel injector 1 comprises a poppet valve 11 with a central bore 35 and a counter bore 33 having a flat inner end 37 and a annular grove 39 on the other end which receives a retainer ring 41 that holds a plurality of flat washer shaped damping rings 31 in the counter bore 33 to absorb momentum by rattling and bouncing as the poppet valve 11 seats to prevent the poppet valve 11 bouncing off the seats 13 and 15.

Abstract: A fuel injector comprises a valve needle biased into engagement with a seating by a spring, a fuel supply line arranged to permit fuel under pressure to be supplied towards the seating, a control chamber communicating through a restricted flow passage with the supply line, and a control valve arranged to control the fuel pressure within the control chamber, wherein the control chamber is defined, in part, by a surface associated with the valve needle, the surface being orientated such that the application of high pressure fuel to the control chamber applies a force to the surface acting in a direction opposing the action of the spring on the valve needle.

Abstract: A hydraulically-actuated fuel injector includes an injector body having a nozzle chamber that opens to a nozzle outlet and a plunger bore, and further has a prime spill port and an idle stability port that open to the plunger bore. A hydraulic means for pressurizing fuel in the nozzle chamber includes a plunger mounted to reciprocate in the plunger bore between a retracted position and an advanced position. A portion of the plunger bore and plunger define a fuel pressurization chamber. A needle valve member is mounted to reciprocate in the nozzle chamber between an open position in which the nozzle outlet is open and a closed position in which the nozzle outlet is closed. A portion of the plunger blocks the prime spill port when the plunger is in its retracted position. A different portion of the plunger blocks the idle stability port when the plunger is in its retracted position.

Abstract: In operation, the main pump (24) is activated and the main value (18) is opened in response to the ignition switch (28) being turned ON to pump fuel from the fuel supply tank (12) to the injectors in the injector manifold (14). During the ON condition, the return control valve (48) is closed to prevent back flow from the injector manifold (14) to the fuel tank (12). In response to the ignition switch (28) being turned to the OFF condition, the main valve (18) is closed and the main pump (24) is deactivated and, most importantly, the return control valve (48) is opened and the return pump (40) is activated to place a negative or vacuum pressure on the upstream side of the injectors to return the residual fuel therein to the fuel tank (12). This prevents the residual fuel from leaking through the injectors and into the combustion chambers of the engine (10), which, in turn, would make it difficult to immediately restart the engine (10) because of a fuel rich condition.

Abstract: A method of controlling hydraulically actuated electrically controlled unit fuel injectors to operate quietly and with less seat wear on a valve disposed therein is disclosed. The disclosed method comprises controlling the pressure of a high pressure working fluid which operates the injector to inject the proper amount of fuel in the cylinders of an internal combustion engine; and responding to changes in the pressure of the working fluid to vary the timing duration and amplitude of a current pulse which activates a stator that draws an armature to the stator and opens a first seat of the poppet valve or other flow regulating device against a spring bias to allow the high pressure working fluid into the injector and closes a second seat to prevent the working from draining from the injector to allow the working fluid to operate the injector.

Abstract: A fuel injection system with an injector for an internal combustion engine has a binary injection nozzle whose pressure chamber can be alternatingly supplied with fuel and a supplemental fluid. A valve device is provided which can control the high-pressure side fuel delivery to the binary injection nozzle and the connection of the pressure chamber to a low-pressure side and to a supply line of the supplemental fluid. The valve device has a reversing valve that is embodied for controlling the impingement of high or low pressure on the pressure chamber and is also embodied for controlling the filling of the pressure chamber with the supplemental fluid. Therefore, the valve device is improved with regard to more rapid and precise switching operations and is also simplified, resulting in greater reliability and reduced maintenance.

Abstract: A method of controlling hydraulically actuated electrically controlled unit fuel injectors to operate quietly and with less seat wear on a valve disposed therein is disclosed. The disclosed method comprises controlling the pressure of a high pressure working fluid which operates the injector to inject the proper amount of fuel in the cylinders of an internal combustion engine; and responding to changes in the pressure of the working fluid to vary the timing duration and amplitude of a current pulse which activates a stator that draws an armature to the stator and opens a first seat of the poppet valve or other flow regulating device against a spring bias to allow the high pressure working fluid into the injector and closes a second seat to prevent the working from draining from the injector to allow the working fluid to operate the injector.

Abstract: In one embodiment of the present invention, a "returnless" fuel delivery system for a motor vehicle includes a fuel pressure regulator located in the fuel tank and a fuel pressure damper located at the fuel rail on the vehicle's engine. The fuel return line from the fuel rail to the fuel tank, a conventional feature in fuel delivery systems, is eliminated. Fuel delivery systems according to the present invention can provide very precise fuel delivery at a highly competitive system cost.

Abstract: An injection pump for diesel-cycle internal combustion engines includes a casing (1), a cylinder (6) within the casing and communicates, via at least one radial aperture (51), with a fuel intake chamber (3), and a piston (7) sealedly slidable within the cylinder and which, by external command, can also rotate about its axis to assume different angular orientations about a reference plane. In its jacket, a helical groove (72) opens into an axial groove (71), wherein the top, or roof, of the piston (7) is connected via a hole (77) to two channels (178, 179) provided at different levels in the piston jacket.

Abstract: An apparatus deliveries fuel to a V-type engine having a first bank and a second bank. The apparatus has a first delivery pipe disposed in association with the first bank, a second delivery pipe disposed in association with the second bank and a fuel pipe for supplying the fuel from a fuel tank to the first delivery pipe and the second delivery pipe. Each delivery pipe has an injector for injecting the fuel from the delivery pipe to a cylinder of the engine. The fuel pipe includes a supply pipe connected with an end of the first delivery pipe to supply the fuel from the fuel tank to the first delivery pipe and a communicating pipe for communicating the end of the first delivery pipe with an end of the second delivery pipe. A first damping element is disposed at the end of the first delivery pipe to damp pressure fluctuation of the fuel supplied from the supply pipe.

Abstract: A fuel injector having a housing with a bore, a tip, and an orifice through the tip and a check having a first end, a second end, and a check guide portion reciprocatable in the bore between first and second positions which, respectively, obstruct and provide fluid communication through the orifice. The check and housing respectively have a primary check seat disposed between the first and second ends and a primary nozzle seat disposed nearer said check guide portion than said tip. The primary check seat being engageable with the primary nozzle seat with a first engagement force when the check is in its first position. The check and housing respectively preferably also include a secondary check seat and a secondary nozzle seat which are engageable with a second engagement force, less than the first engagement force, when the check is in its first position.

Abstract: The invention relates to a pressure valve for installation in a supply line between a pump work chamber of a fuel injection pump and an injection site in an internal combustion engine to be supplied thereby. A valve body is provided with a valve seat and has a through conduit in which a pressure valve closing member is guided. A check valve is disposed in a work chamber, wherein the check valve and the pressure valve closing member are movable relative to one another, in the through conduit. A restoring spring on the injection side causes the check valve to rest in the through bore and on the pump chamber side disposes the pressure valve closing member to the valve seat of the valve body.

Abstract: The injector has a hollow body supporting a nozzle, and a metering valve ing a valve body housed in a cylindrical seat in the hollow body; the valve body has a guide seat for a rod controlling the pin of the nozzle; the guide seat terminates with an end surface against which a stop portion of the rod is arrested; the stop portion has a truncated-cone-shaped surface which engages a truncated-cone-shaped portion of the end surface of the guide seat; and the truncated-cone-shaped portion is adjacent to the control chamber and has the same taper as the truncated-cone-shaped surface.

Abstract: In a fuel injection system for a multi-cylinder internal combustion engine with magnetic valve controlled direct injection fuel injectors of which each includes a housing having an injection nozzle with a nozzle needle biased into a closed position by a spring disposed in a spring chamber, and a magnetic valve controlled control piston having a valve structure at one end for controlling high pressure fuel admission to a fuel supply passage leading to the needle nozzle, the spring chamber is in communication with the fuel supply passage by a communication passage including a throttle structure permitting limited fuel flow to the spring chamber such that, upon failure of the injector resulting in a continuous pressurization of the fuel supply passage, the pressure in the spring chamber builds up to seat the nozzle needle thereby interrupting fuel ejection from the injector.

Abstract: A fuel system damper includes a damper diaphragm, a damper spring, a vacuum bias diaphragm, and a vacuum bias spring. The damper spring is biased between the damper diaphragm and the vacuum bias diaphragm, and the vacuum bias spring is biased against the vacuum bias diaphragm in the top chamber of the damper. A bottom chamber below the damper diaphragm is open to allow fuel from the fuel rail into the chamber so that the damper diaphragm can respond to pressure pulsations in the fuel. The top chamber has an opening that communicates with an engine intake manifold so that when engine intake manifold pressure decreases to very low levels, the vacuum bias diaphragm will travel up. This upward motion reduces the pressure in the fuel rail by removing load from the damper spring. When the pressure regulation setpoint is reached, the regulator will supply fuel to maintain pressure.

Abstract: A fuel device which has a high-pressure fuel source from which a number of fuel injection valves, which are each controlled by a 3-way valve, are supplied with fuel. This 3-way valve has a valve member with a closing body provided with sealing faces that cooperates with valve seats and in addition, in its closed positions, defines pressure-exposed surfaces that produce resulting forces that are active in the respective closed position of the closing body.

Abstract: An injector is disclosed which comprises a valve needle spring biased into engagement with a seating. The spring engages a spring abutment piston which defines, in part, a chamber which communicates, in use, with a spill valve, a restricted drain passage, and a fuel inlet. A non-return valve is located within the chamber and arranged to control communication between the chamber and the fuel inlet.

Abstract: A fuel injector comprises a valve needle biased by a spring towards a seating. The spring engages a spring abutment member which is moveable with a piston member. The spring abutment member defines, with a member carried by the needle, a damping chamber which communicates through a restricted passage with a low pressure drain to damp movement of the needle relative to the piston member.

Abstract: A fuel rail damper for use within the fuel rail of an internal combustion engine includes a flexible tubular diaphragm which extends along the center of the fuel rail. The distal end of the tubular diaphragm is closed and the proximal end of the tubular diaphragm is open and connected to a diagnostic fitting at one end of the fuel rail. This fitting includes a diagnostic valve core and a cap which permit external servicing. The diagnostic fitting is removable which permits the fitting to be easily installed or removed, thus facilitating replacement of the fitting, if necessary. The diagnostic fitting is sealed after the tubular diaphragm is pressurized to a pressure below the operating pressure within the fuel rail.

Abstract: An injector is disclosed which comprises a nozzle body arranged to receive fuel under pressure from a pumping chamber. An injection control arrangement in the form of a valve controls injection timing, and a drain control arrangement in the form of a valve controls communication between the pumping chamber and a fuel reservoir. An electromagnetic actuator controls operation of both valves, the actuator including a single, common armature which is associated with both of the valves.

Abstract: This fuel injection device changes stepwise the effective opening area of the exhaust opening that releases the fuel pressure in the balance chamber, in order to control the lift velocity of the needle valve to give flexibility to the pattern of the initial fuel injection rate. The fuel injection device of this invention switches the current value applied to the solenoid between the large and the small value to change the distance traveled by the solenoid valve and thereby change the opening degree of the exhaust port that releases the fuel pressure in the balance chamber. Because the return spring mechanism having plural springs, the magnitudes of current necessary to be applied to the solenoid to move the solenoid valve are clearly differentiated. This reduces variations in the process of releasing the fuel pressure in the balance chamber, assuring a stable fuel injection rate control.

Abstract: It has been determined that a fuel delivery system with a fuel supply line and electromagnetically actuatable fuel injection valves produce fuel oscillations during opening and closing of the fuel injection valves and therefore generates noise, which is transmitted into the passenger compartment of the vehicle and annoys the passengers. In order to damp this kind of noise, at least one elongated, hollow damping body is connected at right angles to the fuel supply line and has a closed end. The axial length of the hollow damping body corresponds to 11/2 times the wavelength of the fuel oscillation to be damped in the fuel supply line. The length of the at least one damping body can also correspond to 11/2 times the wavelength of the fuel oscillation to be damped in the fuel supply line, divided by 2 or by a multiple of 2. The fuel delivery system is particularly suited for mixture compressing internal combustion engines with externally supplied ignition.