Abstract: The invention relates to a fuel pressure damping system for use in a hydraulic system. The invention introduces specifically sized restrictors in the fuel passage to control the maximum operating system pulse magnitude as well as damping the overall pulsations of the system.

Abstract: The fuel injection system has one high-pressure fuel pump and one fuel injection valve for one cylinder of the engine. The fuel pump has a work chamber, and the injection valve has a valve member, and which is movable in an opening direction, counter to the force of a closing spring, by the pressure in a pressure chamber communicating with the pump work chamber; the closing spring is braced between the injection valve member and a displaceable deflection piston which, defines a prechamber that communicates with the pump work chamber. The deflection piston is movable into a storage chamber counter to the force of the closing spring. The prechamber communicates with the pump work chamber via a first throttle restriction, and the pressure chamber of the fuel injection valve communicates with the pump work chamber via a second throttle restriction, circumventing the prechamber.

Abstract: An injector for injecting fuel into the combustion chamber of an internal combustion engine includes an injector housing, in which a pressure chamber surrounds an insert part. The pressure chamber can be filled with fuel at high pressure via a high-pressure inlet. Via the pressure chamber, a control chamber defined by the insert part and a valve component is subjected to pressure. The valve component is movable inside the insert part, thus executing a stroke motion. A one-piece, metal sealing element is received by a nonpositive connection on the circumference of the insert part is subjected to the high pressure prevailing in the pressure chamber.

Abstract: An injector is provided which includes a nozzle valve element, a control volume, and an injection control valve including a control valve member for controlling fuel flow from the control volume so as to control nozzle valve movement. Importantly, the injector includes a nozzle valve lift detecting device for detecting nozzle valve lift and providing a nozzle valve element lift feedback signal. Feedback signals are improved and control valve member oscillations are minimized by positioning a valve seat associated with the control valve member a spaced distance from the control volume, positioning a drain orifice such that the nozzle valve element restricts flow through a drain circuit when in an open position and extending the control valve member from the valve seat to the control volume to form an end wall of the control volume.

Abstract: A fuel system for an internal combustion engine includes at least four fuel injectors for supplying fuel to corresponding combustion chambers of the engine and a pump assembly in fluid communication with the fuel injectors and supplying working fluid to the fuel injectors. The fuel system further includes at least three high pressure rails fluidly connected between the pump assembly and the at least four fuel injectors.

Abstract: A fuel volume accumulator is provided to hold rail pressure for hot engine restart and then reduce fuel pressure when the engine is off thereby minimizing evaporative emissions during diurnal cycles by preventing pressure build up as a temperature of a fuel system rises. The fuel volume accumulator comprises a fuel inlet body, and a moving element adapted to communicate with an inner surface of the fuel inlet body to define a fuel chamber. The fuel chamber is adapted to expand with substantially minimal pressure resistance until the extent of its volume is encountered. The fuel inlet body is in open communication at a first end with a fuel pump via a check valve and a fuel rail via an orifice which restricts fuel flow to substantially maintain a quick fuel rail re-pressurization.

Abstract: A method of controlling the fuel injection to a combustion chamber (4), comprises the steps of: supplying fuel to a pump (2), which has a piston (7) reciprocating in the a cylinder (6), pressurizing the fuel by applying a force onto the piston (7) by an actuator (8), so that the piston (7) is displaced from a first end position (9) towards a second end position (10), injection of fuel corresponding to a partial volume of the fuel pressurized in the cylinder (6), into the combustion chamber (4), and returning the piston (7) towards the first end position (9) by the pressurized fuel, so that the piston (7) acts with a driving force on the actuator (8). The invention also relates to a fuel injection device for carrying out the method.

Abstract: A fuel injection system having a high-pressure pump and a fuel injection valve for each cylinder of the engine in which the pump has a work chamber, and the fuel injection valve has a valve member movable in an opening direction counter to the force of a closing spring braced between the injection valve member and a displaceable storage piston that is acted upon, on its side remote from the closing spring, by the pressure in the pump work chamber. The storage piston is movable into a storage chamber counter to the force of the closing spring and the deflection stroke motion of the storage piston is limited by a stop.

Abstract: The valve having a valve member guided displaceably in the direction of its longitudinal axis protrudes into a valve pressure chamber and has a sealing face extending transversely to axis, has a sealing face, which it cooperates with a valve seat, extending transversely to axis, for at least extensively closing off an opening, surrounded by the valve seat, from the valve pressure chamber. The sealing face is surrounded by an annular face, which when the valve member rests on the valve seat is disposed at a slight spacing from the valve seat. The valve member has a plurality of apertures, distributed over its circumference, through which the opening communicates with the valve pressure chamber when the valve member is resting on the valve seat.

Abstract: The invention relates to a fuel injection device for a reciprocating internal combustion engine, comprising a nozzle part (5) with an injection nozzle (13), said nozzle part having a pressure chamber (10) in which a nozzle needle (9) that closes the injection nozzle (13) is guided. Said nozzle needle can be moved into the opening position when subjected to pressure by the fuel to be injected. The pressure chamber (10) is connected to a control part (7) by a connecting channel (6), this control part having a valve chamber (21) into which the connecting channel (6) and a high pressure channel (8) that is connected to a fuel supply (4) open, and in which a valve body (23) is guided. Said valve body (23) acts as a piston system and is held in the closing position by a valve spring and a valve seat (22).

Abstract: A fuel injection system has a pressure booster unit (1), disposed between a pressure reservoir chamber and a nozzle chamber, which unit has a displaceable piston unit (4) for boosting the pressure of the fuel to be supplied to the nozzle chamber. For controlling the pressure booster unit (1), the piston unit (4) has a transition from a larger to a smaller piston cross section and a differential chamber (2) formed thereby, which is connected to the pressure reservoir chamber via a filling path (13) having a filling valve (10). A reduction in the control quantity during the triggering of the pressure booster unit (1) and the performance of a rapid restoration of the piston unit (4) are attained.

Abstract: The fuel injection system has one high-pressure fuel pump and one fuel injection valve, communicating with it, for each cylinder of the engine. The fuel pump piston is driven in by the engine and defines a pump work chamber communicating with a pressure chamber of the fuel injection valve. The fuel injection valve has a first hollow injection valve member movable in an opening direction counter to a closing force by the pressure prevailing in the pressure chamber to control at least one first injection opening. A second injection valve member is guided displaceably inside the first injection valve member and is movable counter to a closing force in an opening direction by the pressure prevailing in the pressure chamber member to control at least one second injection opening. One face is associated respectively with the first injection valve member and the second injection valve member and is acted upon by the pressure prevailing in a fuel-filled pressure chamber.

Abstract: A returnless type fuel delivery pipe is provided for each cylinder bank of an opposed type engine. A connecting pipe is connected to this pair of fuel delivery pipes, a supply pipe is connected to this connecting pipe, thus coupling the fuel delivery pipes with the fuel tank. The fuel delivery pipes are made to be capable of absorbing and reducing pressure pulsation through elastic deformation of the external walls thereof, and the supply pipe is connected to an intermediate section of the length of the connecting pipe. Pressure pulsations with opposite phases caused by fuel injection of the fuel delivery pipes interfere with and attenuate each other in the supply pipe at or near intersection thereof with the intermediate section of the connecting pipe.

Abstract: A method and a system are provided for injecting fuel into the combustion spaces of an internal-combustion engine, in which case the injection system contains a number of fuel injectors each comprising an injection valve and a common feed and storage line supplying the individual fuel injectors with highly pressurized fuel. The beginning and the end of the injection of the fuel into the combustion chamber are controlled by opening and closing the injection valve. A defined lowering of the fuel pressure existing in the fuel injector takes place during the injection, so that the pressure which rises because of the ram pressure during the closing of the injection valve at the end of the injection in the fuel injector does not exceed a defined value, particularly preferably the system pressure of the fuel injection system.

Abstract: A fuel injection system for internal combustion engines includes an injector supplied from a high-pressure fuel source and a pressure booster device, in which the pressure booster device has a movable pressure booster piston that disconnects a chamber that is connectable to the high-pressure fuel source from a high-pressure chamber communicating with the fuel injector, and by filling a return chamber of the pressure booster device with fuel and by evacuating the return chamber of fuel, the fuel pressure in the high-pressure chamber can be varied, and the fuel injector has a movable closing piston, for opening and closing injection openings, which protrudes into a closing pressure chamber, so that the closing piston can be subjected to fuel pressure to attain a force acting in the closing direction on the closing piston, and the closing pressure chamber and the chamber are formed by a common work chamber, and all the portions of the work chamber communicate permanently with one another for exchanging fuel.

Abstract: A nozzle needle of a fuel injector is driven in a controlled manner by changing back pressure applied thereto. The back pressure is controlled by a pressure control valve driven by stacked piezoelectric elements. A valve body of the pressure control valve is disposed in a valve chamber having a drain port and a high pressure port which are selectively closed. A diameter D1 of a drain seat, a diameter D2 of a high pressure seat, and a diameter D3 of a piston portion connected to the valve body are set to satisfy a relation: D1≧D2≧D3. In this manner, operation of the pressure control valve is stabilized, and thereby the fuel injector is smoothly and stably operated.

Abstract: Fuel injectors equipped with direct control needle valves can add new capabilities to a fuel injection system, but can sometimes have difficulty in achieving low hydrocarbon emissions at levels comparable to ancestor fuel injectors that utilize a simple spring biased needle. The present invention seeks lower hydrocarbon emissions by reducing fuel pressure before the direct control needle valve member has reached its closed position toward the end of an injection event. Reducing fuel pressure can be accomplished in a number of ways depending upon the particular fuel injection system, including spilling fuel pressure in a cam system or possibly relieving pressure on an intensifier piston.

Abstract: A method for controlling an injector is described, where the trigger signal for the actuator is controlled as function of the amplitude and the duration. The actuator, using an hydraulic coupler, actuates a control valve which, at a low voltage, operates in a ballistic mode and opens up an opening cross-section to an inlet channel. The opening cross-section becomes smaller with increasing trigger voltage, and the fuel quantity to one injected increases. The control valve is brought from ballistic mode to nonballistic mode via the amplitude and duration of the trigger voltage. The delivery duration and the amplitude of the trigger voltage are tuned to each other so that one or several jumps may occur, during which a switch is made from one voltage value to another voltage value, and from one delivery duration to another delivery injection. A piezoelectric element is preferably used as an actuator.

Abstract: The fuel injection apparatus has a high-pressure fuel pump and a fuel injection valve connected to it for each cylinder of the engine. The high-pressure fuel pump has a pump piston, which is driven in a stroke motion by the engine and defines a pump working chamber, which is connected by means of a line to a pressure chamber of the fuel injection valve that is disposed separate from the high-pressure fuel pump in the engine and has an injection valve member, which is used to control at least one injection opening and can be moved by the pressure prevailing in the pressure chamber in an opening direction, counter to a closing force, in order to unblock the at least one injection opening. An electrically actuated control valve is provided in the fuel injection valve and at least indirectly controls a connection of the pump working chamber to a relief chamber, which can store pressurized fuel diverted by the control valve when this valve is open.

Abstract: A fuel injection pump includes a plurality of plungers and a cam shaft having a plurality of drive cams (31, 32) corresponding to the plungers. The cam shaft is rotated by a power from the outside so as to reciprocate the plurality of plungers by the corresponding drive cams, and fuel is pressurized and force-fed in the forward stroke of each plunger. All or a part of the drive cams (31, 32) are installed with the phase thereof shifted, and the cam lobes (31a, 32a) of the drive cams are formed asymmetrical so that the amount of displacement of the plungers relative to a unit cam rotating angle is reduced in the forward stroke more than in the backward stroke of the plunger. Thus, the pressure variation in a common rail is reduced, the pressure resistance of the entire system is lowered, and the drive torque is reduced so as to reduce the load and noise of a drive system.

Abstract: An electromechanical fuel injector for an internal combustion engine. The fuel injector includes a pump unit and a control valve assembly in communication with the pump unit. The control valve assembly including a body and a stator. The fuel injector also includes a stator nut cooperable with the valve body to secure the stator to the valve body and at least one expansion tank to accumulate pressure created by the pump unit. The fuel injector may also include a spacer.

Abstract: The invention relates to a fuel injection device for an internal combustion engine, having a common high-pressure collection chamber (common rail) that can be filled via a high-pressure pump. The high-pressure collection chamber communicates with injection valves, each of which includes a control valve embodied as a 3/2-way valve. Control faces are provided on the control part, which connect a high-pressure collection supply line to inflow lines to the injection nozzle or with a relief line, and the control part is actuatable by a controlled outflow line. The control part includes a throttle element, which via a bore communicates with a hollow chamber.

Abstract: A fuel injection system, having a fuel injection valve and a control valve, which control valve has a control valve member that is longitudinally displaceable in a control valve bore. A control valve sealing face is embodied on the control valve member; it cooperates with a control valve seat and thus controls the communication between a first pressure space and a second pressure space; the first pressure space communicates with a high-pressure collection chamber. In a valve body, a bore is embodied in which a pistonlike valve needle, with its end toward the combustion chamber, controls the opening of at least one injection opening by executing a longitudinal motion in response to the pressure in a pressure chamber; the pressure chamber communicates with the second pressure space via an inlet conduit.

Abstract: The fuel injection system has one high-pressure fuel pump (10) and one fuel injection valve (12) for one cylinder of the engine. The high-pressure fuel pump 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), by the pressure prevailing in a pressure chamber (40) communicating with the pump work chamber (22); the closing spring (44) is braced on one end on the injection valve member (28) and on the other on a displaceable deflection piston (50), which on its side remote from the closing spring (44) defines a prechamber (85) that communicates with the pump work chamber (22). The deflection piston (50) is movable into a storage chamber (55) counter to the force of the closing spring (44).

Abstract: A fuel rail assembly includes an integral pressure damper and an over-pressure stop to prevent the damper from flexing beyond it elastic limit. The rail assembly also includes injector cups formed outwardly relative to the rail to provide substantially unimpeded fuel flow to the injector. The fuel rail assembly further includes a damper cover to protect the damper from outside damage. The damper cover can be hermetically sealed to form an air chamber above the damper and opposite the fuel chamber in the fuel rail thereby providing a means for keeping the pressure differential between the chambers in an APDI fuel injection system substantially constant.

Abstract: A fuel injection system has one or more unit fuel injectors or pump-line-nozzle units, corresponding in number to the cylinders, for compressing the fuel. The fuel injection system includes means for generating two different injection pressures during the injection and at least one valve for controlling the injection with a cross sectional control. The fuel injection with the aid of the unit fuel injector or a pump-line-nozzle unit can be achieved over a wide rpm range with great precision.

Abstract: A control valve for injectors of injection systems for internal combustion engines is proposed, in which the final control element is actuated by an actuator via a hydraulic booster.

Abstract: A fuel rail is provided which includes a housing formed by a first member with a first thickness. A bracket is provided, connected to the first member to connect the fuel rail to an internal combustion engine. A second stamped member is provided and is sealably connected to the first member to form a control volume therewith. The second member has a second thickness that is materially lower than the first thickness. Accordingly, the second member has a wall to damp pulsations caused by the opening and closing of the injectors fluidly connected with the rail.

Abstract: A high-pressure fuel system, having a housing (1) that includes a first high-pressure body (3) and a second high-pressure body (5), which contact one another at a contact face (30). A high-pressure chamber (23) embodied in the housing (1) passes through the contact face (30), and at least intermittently a high fuel pressure is present in it. A wall part (7), which has a longitudinal axis (15), surrounds the housing (1) at least in the region of the contact face (30), so that between the wall part (7) and the housing (1), a leak fuel chamber (32) is formed, which is sealed off from the outside.

Abstract: A device provided with a fuel injector and a reservoir for temporarily storing the fuel to be fed to the fuel injector. Fuel is injected at least two times in one engine cycle. Pulsation of fuel occurring in the fuel injector due to a prior fuel injection is propagated to the reservoir, reflected at the reservoir, and returns to the fuel injector. Due to the effects of the returned pulsation, the fuel injection amount in the later fuel injection fluctuates. The opening timing of the fuel injector and the fuel injection pressure are employed as parameters affecting the fuel injection amount in the later fuel injection, the amounts of fluctuation of the parameters due to the pulsation are estimated, and a control value relating to the operation of the fuel injector is controlled based on the estimated amounts of fluctuation of the parameters so that a target amount of fuel is injected from the fuel injector.

Abstract: A method of securing fuel rail dampers within a fuel rail using clips and fingers that engage the damper and rail surfaces while providing substantially no motion between the rail and the damper assembly.

Abstract: Fuel injection system comprising a piezoelectric element for controlling the amount of injected fuel and further comprising a control unit for determination of a possible fault of the piezoelectric element or of an electric circuitry driving the piezoelectric element based upon a value related to the capacitance of the piezoelectric element.

Abstract: A fuel injection system for internal combustion engines, having a fuel injector that can be supplied from a high-pressure fuel source and having a pressure booster device is proposed, in which the pressure booster device has a movable pressure booster piston that disconnects a chamber that is connectable to the high-pressure fuel source from a high-pressure chamber communicating with the fuel injector, and by filling a return chamber of the pressure booster device with fuel and by evacuating the return chamber of fuel, the fuel pressure in the high-pressure chamber can be varied, and the fuel injector has a movable closing piston, for opening and closing injection openings, which protrudes into a closing pressure chamber (12; 112), so that the closing piston can be subjected to fuel pressure to attain a force acting in the closing direction on the closing piston, and the closing pressure chamber (12; 112) and the chamber (26; 126) are formed by a common work chamber, and all the portions (12, 47, 26; 112, 130

Abstract: Online optimization of injection systems having piezoelectric elements which are used, for example, as actuators in a fuel injection system of an internal combustion engine, wherein the piezoelectric element is activated by an activation voltage having a value set as a function of operating characteristics of the particular piezoelectric element, and based upon, for example, a correction value for injected fuel volume.

Abstract: A fuel injection system for internal combustion engines, with a fuel injector that can be supplied from a high-pressure fuel source and with a pressure booster device, is proposed in which the closing piston (13; 113) of the injector protrudes into a closing pressure chamber (12; 112), so that the closing piston can be acted upon by fuel pressure to attain a force exerted on the closing piston in the closing direction, and in which the closing pressure chamber (12; 112) and the return chamber (27; 127) of the pressure booster device are formed by a common closing pressure return chamber (12, 27, 41; 112, 127, 141), and all the portions (12, 27; 112, 127) of the closing pressure return chamber communicate (41; 141) with one another permanently for exchanging fuel, so that despite a low pressure boost by the pressure booster device, a relatively low injection opening pressure is attainable.

Abstract: The invention proposes a fuel injection device for internal combustion engines, with a fuel injector that can be supplied by a high-pressure fuel source, wherein a pressure intensifying device that has a movable piston is connected between the fuel injector and the high-pressure fuel source, wherein the movable piston separates a chamber connected to the high-pressure fuel source from a high-pressure chamber connected to the injector, wherein the fuel pressure in the high-pressure chamber can be varied by filling a return chamber of the pressure intensifying device with fuel or by emptying fuel from the return chamber, wherein a valve (50; 70) is provided with a valve body (51; 78), which can be moved as a function of the fuel pressure prevailing in the return chamber (38) so that the valve (50; 70) can connect (56, 53, 52; 76, 86, 88, 72) the high-pressure chamber (40) to the chamber (35). The invention also proposes a pressure intensifying device (30) that is suitable for this purpose.

Abstract: The fuel injection apparatus has one fuel pump for each cylinder, which has a pump piston, driven by the engine, 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; a first electrically triggered control valve controls a communication of the line with a relief chamber. A second electrically triggered control valve is also disposed on the fuel injection valve and controls the pressure prevailing in a control pressure chamber of the fuel injection valve, which pressure urges the injection valve member in the closing direction.

Abstract: A hydraulic system comprises a pump, low pressure drain, high pressure rail, fuel injector, a gas exchange valve actuator, and a timing valve. The high pressure rail is connected to the pump with a supply line. A method of operating an engine comprises the steps of opening a gas exchange valve by connecting it with the outlet of the pump at a first chosen time, supplying pressurized fluid to a high pressure rail by connecting it with the outlet of the pump after the first time, and injecting fuel by supplying fluid from the high pressure rail to a fuel injector at a second chosen time. An engine comprises an engine casing that defines a plurality of cylinders. A fuel injector, gas exchange valve actuator, pump, supply line, and timing valve is provided for each of the cylinders. A low pressure drain and a high pressure rail are also provided.

Abstract: A fuel injection device for an internal combustion engines includes a housing with an injection end. A recess extends inside the housing contains an axially movable valve element, which cooperates with a valve seat and has a pressure surface oriented away from the injection end, which pressure surface axially delimits a control chamber. A device is provided which acts on the valve element counter to the force resultant of the pressure surface. A control valve is connected to the control chamber via a flow throttle. The control valve has at least three connections and at least two switching positions and is connected to a high-pressure fluid inlet and a low-pressure fluid outlet on the one side and be connected to the flow throttle on the other side.

Abstract: By setting a switching timing of switching means that connects either one of a high pressure fuel source and a low pressure fuel source to an injector earlier than a point of time when an injector finishes a high pressure fuel injection, leak fuel or return fuel is reduced and an engine load is reduced and therefore mileage is improved.

Abstract: Reducing leakage within fuel injectors is one way in which the efficiency of the overall fuel injection system can be improved. In most fuel injectors that include a direct control needle valve, the needle valve member is still biased toward a closed position by a spring that is located in a spring chamber connected to a low pressure vent. In many instances, the needle valve member is guided in a tight clearance region adjacent the spring chamber. Since the internal plumbing of the fuel injector is connected to a high pressure rail during and between injection events, static leakage across the guide region of the needle valve member can reduce efficiency. Static leakage is reduced in the present invention by connecting the spring chamber to the common rail instead of to a low pressure vent.

Abstract: A micro-pulsation fuel injection system with underpressure stabilizer, comprising a fuel supply system, a fuel tank, a micropump, and a compression pump. The micropump ejects fuel into an intake pipe. The compression pump is connected with a fuel supply pipe of the micropump, for keeping underpressure of the inlet of the micropump against the intake pipe stable. Incoming fuel passes through a fuel chamber, separated by a membrane from a pressure chamber, which in turn is connected to the intake pipe. The membrane deforms according to pressure in the intake pipe, changing volume of the fuel chamber and generating underpressure of fuel therein. Additionally, a regulating valve is installable between the compression pump and the micropump for stabilizing the difference of pressures at the inlet of the micropump and in the intake pipe. Thus the quantity of fuel ejected by the micropump is precisely controlled.

Abstract: A fuel rail that forms a conduit for pressurized fuel to be delivered to at least one fuel injector. The fuel rail includes an elongated member that is corrugated such that the fuel rail acts as a pressure damper. A method of reducing pressure pulsation in a fuel system is achieved by configuring a fuel of a second configuration from an initial configuration, the second configuration having a first portion and a second portion, the first portion having at least three points defining a virtual plane, the first portion including a continuous surface that intersects the virtual plane at a plurality of positions.

Abstract: A common-rail injection system includes a first accumulator of high pressure and a second accumulator of low pressure. The common-rail injection system includes a post injection control device for injecting additional low-pressure fuel from the second accumulator through a fuel injection nozzle after main fuel is injected. The post injection control device injects the additional fuel the injection terminates at a first timing when the fuel pressure in either fuel passage or second accumulator lowers to a predetermined value lower than that of the high-pressure fuel or at a second timing when an exhaust stroke of the engine is completed, whichever earlier.

Abstract: A valve arrangement is provided for a feed line to supply fuel from a tank to a combustion engine consisting of a valve housing with an inlet channel and outlet channel, and a valve with a movable valve head to seal the outlet channel from the inlet channel, whereby a feed pump is assigned to the feed line, and the valve head is in closed position when there is no feed pressure from the feed pump. The danger of feed line leakage for combustion engines that burn liquid fuel is eliminated using a coaxial second valve using no additional space to solve the problem. The other essentially coaxial valve within the main valve is in open position opposite the feed direction when the pressure at the outlet channel is greater than the feed pressure. The valve arrangement functions as a check valve when the combustion engine is running, and as an overpressure valve when it is off.

Abstract: A throttle element with a gap filter for use in a fuel pump is proposed, which is press-fitted into a conduit in the housing of an injection pump. By means of the press fitting, a good sealing action and at the same time low-cost production and mounting are attained. The throttle element can furthermore be designed economically and compactly.

Abstract: A fuel injection valve includes a valve seat member, and an injector plate which is coupled to a front end face of the valve seat member and has a plurality of fuel injection orifices disposed about an axis of the valve seat member to communicate with a valve seat. Swirling means for swirling a fuel injected from each of the fuel injection orifices is provided in at least one of the valve seat member and the injector plate. The plurality of fuel injection orifices are disposed so that liquid membrane portions of adjoining hollow conical fuel spray forms formed by the fuel injected from the fuel injection orifices collide with one another. Thus, the atomization of the injected fuel can be further promoted, and a coalesced fuel spray form having a fuel particle density higher in a central zone and lower in an outer peripheral zone can be formed.

Abstract: A device provided with a fuel injector and a reservoir for temporarily storing the fuel to be fed to the fuel injector. Fuel is injected at least two times in one engine cycle. Pulsation of fuel occurring in the fuel injector due to a prior fuel injection is propagated to the reservoir, reflected at the reservoir, and returns to the fuel injector. Due to the effects of the returned pulsation, the fuel injection amount in the later fuel injection fluctuates. The opening timing of the fuel injector and the fuel injection pressure are employed as parameters affecting the fuel injection amount in the later fuel injection, the amounts of fluctuation of the parameters due to the pulsation are estimated, and a control value relating to the operation of the fuel injector is controlled based on the estimated amounts of fluctuation of the parameters so that a target amount of fuel is injected from the fuel injector.

Abstract: In an injection hole plate of a fuel injection device, injection holes are arranged about a circle. Fuel injected from the injection holes forms a flat sector-shaped spray. The intervals between adjacent injection holes are approximately equal to each other, while the diameters of the injection holes are equal to each other. An injection hole is positioned on an imaginary plane, which contains the central axis of the sector-shaped spray along the injection direction and is orthogonal or approximately orthogonal to the sector-shaped spray. The injection holes, away from the imaginary plane in this order, are symmetric with respect to the line of intersection of the injection hole plate and the imaginary plane. The farther each injection hole is away from the imaginary plane, the larger an angle of gradient of the injection hole with respect to the imaginary plane becomes.

Abstract: A fuel supply apparatus for an engine according to the present invention comprises: a plurality of injectors 13 for injecting a fuel to an intake manifold of an engine; a delivery rail 20, to which the plurality of injectors 13 are attached, for distributing the fuel to each of the injectors 13; and a fuel tube 11 for feeding the fuel, which is delivered forcedly by means of a fuel pump, to the delivery rail 20. The body portion of the delivery rail 20 has side portions having different areas, and an orifice portion wherein the end portion of the fuel tube 11 is connected to the side portion 20a having the largest area of the all side portions.