Abstract: A fuel pressure regulator is provided for producing more than one fuel pressure. The fuel pressure regulator includes a pressure plate that restricts fuel flow between an input line and an output line. A spring is provided for applying a force to the pressure plate. A coil and armature are also provided. The coil attracts the armature to a casing or head pole, thus applying more force to the pressure plate.

Abstract: A fuel injection system for internal combustion engines, has a distributor tube and a high-pressure pump which is driven as a function of engine rpm and serves to generate the fuel pressure and fuel throughput required in the distributor tube in the applicable operating state of the engine, and also has a fuel metering unit, which is assigned to the high-pressure pump and is based on an electromagnetically actuated regulating valve (11). The fuel metering unit (10, 11) is disposed in the high-pressure pump, the outlet (36) of the regulating valve (11) discharges into the low-pressure region of the high-pressure pump. The inlet (32, 34) of the regulating valve (11) communicates with the compression side of a prefeed pump. The regulating valve (11) has a valve piston (23), which is actuated—into the opening position—by a compression spring (25) and which is actuatable counter to the spring force—into the closing position—by an armature bolt (14) of the electromagnet (10).

Abstract: A pumping system for a fuel injection system includes a body defining a high pressure pumping chamber, a plunger, a high pressure outlet, a high pressure fluid line connecting the pumping chamber to the outlet, a control valve along the fluid line, and a valve and restriction arrangement along the fluid line. The valve and restriction arrangement includes a restriction and a valve body. The valve body is movable between an open position in which fuel flow from the pumping chamber is generally unrestricted by the restriction and a closed position in which fuel flow from the pumping chamber is significantly restricted by the restriction to store energy in the pumping chamber. Advantageously, the high pressure restriction concept may be utilized in a pumping system for various types of rate shaping, including boot injection and square injection, in addition to pilot operation and post injection operations, and others.

Abstract: A fuel pressure control apparatus and method controls a pressure of fuel that is delivered from a fuel pump to a fuel pipe in an internal combustion engine of a vehicle. A controller of the fuel pressure control apparatus calculates a controlled variable based on at least an integral term that is updated in accordance with a difference between an actual fuel pressure in the fuel pipe and a target value thereof; and controls an amount of the fuel delivered from the fuel pump in a feedback manner, using the controlled variable, so that the actual fuel pressure approaches the target value. During the control of the fuel pressure, the controller inhibits updating of the integral term to a value that results in an increase in the amount of the fuel delivered from the fuel pump, when the amount of the fuel delivered is approximate to or equal to a maximum value thereof.

Abstract: A method and a device for controlling an internal combustion engine, in particular an internal combustion engine having a common rail system. A pump delivers fuel into an accumulator. A sensor signal, which characterizes the fuel pressure prevailing in the accumulator, is detected. On the basis of a filtered sensor signal, a correction value is able to be preset for correcting the sensor signal.

Abstract: A control element for an injection system, which includes a high-pressure collection container, from which a high-pressure line extends to a housing surrounding the control element. The housing includes both a pressureless outlet to a reservoir and a connecting bore leading to injection systems. The overlap of the inlet-side control edges, which causes the closure of the high-pressure line, is brought about by means of triggering actuating devices, reinforced by at least one force reservoir assigned to the control element.

Abstract: A fuel injection system for internal combustion engines, has a distributor tube and a high-pressure pump that is driven as a function of engine rpm and that serves to generate the fuel pressure and throughput required in the distributor tube in the applicable operating state of the engine. The system also includes a fuel metering unit, which is associated with the high-pressure pump and includes a regulating valve which is actuated electromagnetically. The fuel metering unit is disposed in the high-pressure pump, and the outlet of the regulating valve discharges into the low-pressure region of the high-pressure pump. The above design features make a fuel metering unit possible that is capable of metering the exact quantity of fuel desired in the applicable engine operating state to the high-pressure pump of the CR system.

Abstract: The injector has a hollow body housing a fuel metering valve closed by a closing spring; and a support housing an electromagnet controlling an armature. The support is connected to the hollow body, and the armature provides for opening the valve. The armature is fitted inside the hollow body by means of a leaf spring hinge having an annular portion fixed between the hollow body and the support, and a projecting radial tongue fixed to a central portion of the armature. The tongue, together with at least one radial appendix of the leaf spring hinge, provides for arresting the armature with a predetermined clearance with respect to the core of the electromagnet.

Abstract: A method of controlling the operation of an engine fuel system including at least one fuel injector, a high pressure fuel pump for delivering fuel to the injector and a pressure sensor arranged to provide an output signal indicative of the pressure of fuel delivered to the injector, comprises the steps of controlling the rate of flow of fuel delivered from the pump to the injector by means of a metering valve arrangement supplied with a control current, measuring the speed of the engine and monitoring the status of the pressure sensor so as to determine whether a fault condition has occurred within the sensor. In the event that a fault condition has occurred in the pressure sensor, the control current supplied to the metering valve arrangement is varied in response to the measured engine speed signal so as to maintain operation of the engine at a substantially constant, predetermined engine speed. The invention also relates a fuel system for implementing the control method.

Abstract: A control strategy for a throttled inlet oil pump that supplies high-pressure oil to a rail that serves fuel injectors of a diesel engine. A processor processes certain data to develop data for selectively restricting the throttle at the pump inlet. The processor develops error data defining error between a desired injector control pressure in the rail and actual injector control pressure in the rail. For a prevailing value of the error data, the processor adds a correlated offset data value to introduce an offset into the prevailing error data value, thereby creating an offset error data value. The processor further processes the offset error data value to create a value for the data that establishes the throttle restriction.

Abstract: The present invention relates to fuel injectors having the ability to inject fuel at multiple pressures during an injection event. Traditional fuel injectors used in common rail fuel injection systems and unit pump fuel injection systems typically did not have the ability to inject fuel at multiple pressures during an injection event. However, engineers have learned that increased control over an injection event can lead to improved emissions by the fuel injectors. Therefore, the present invention utilizes an electronically controlled valve member that can direct. the flow of fuel through a fuel injector during an injection event between a relatively restricted passageway and a relatively unrestricted passageway. The present invention finds particular application in both common rail fuel injection systems and electronic unit pump fuel injection systems used in diesel engines.

Abstract: Mounted on the upper surface of the cover portion (3) of a fuel supplying apparatus (10) to be mounted to an opening portion (2a) of a fuel tank (2) is a fuel pressure regulator (20), which contains a fuel pressure detector portion (21) constituted by a diaphragm portion (21a) detecting a pressure of the fuel discharged from a fuel pump (4) and a current control portion (22) for analogue-controlling the current flowing through the fuel pump (4) by a signal from the fuel pressure detector portion (21), whereby the fuel pump (4) is set to pump an amount of the fuel corresponding to that required by the injector mounted to the engine, so that the current consumption of the fuel pump (4) is reduced and the operating noise is lowered.

Abstract: A fuel injection device for internal combustion engines which supplies fuel from a high-pressure fuel source to a fuel injection valve, controlled by means of a control device. The fuel injection valve has an injection valve member which is acted on with the supplied high fuel pressure by means of a pressure shoulder and can consequently be opened in order to execute the injection. The fuel is supplied via a pressure line whose flow is controlled by a control valve whose control valve member is moved between first and second valve seats in a valve chamber and thereby controls the connection between the high-pressure fuel source and the fuel injection valve via the valve chamber for a preinjection and a main injection.

Abstract: A pressure regulating device for high pressure fuel systems includes a pressure sensing element attached directly to a pressure chamber. The pressure sensing element includes a semiconductor element that deflects in response to a deflection of a portion of the pressure caused by fuel pressure within the pressure chamber. A coil is electrically connected with the pressure sensing element and is configured to generate a magnetic field that moves a magnetic armature to control fuel pressure.

Abstract: A high pressure internal combustion engine having a triple thermal cycle system for improved cooling and combustion utilizing an annular volume surrounding the cylinder having a connecting passage to the combustion chamber allowing air to enter the volume on compression, and a water injection system for injecting water into the volume during initiation of combustion, the water spray changing to steam to drive the air into the combustion chamber during combustion, the air, steam and combustion gases mixing and improving the engine efficiency, the system being combinable with an injection system that conserves energy by pumping high pressure fluid only during the injection process.

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 fuel supply system (1) for an internal combustion engine, especially of a motor vehicle, is described which is provided with an accumulator (2) and a pump (6, 10). Fuel can be supplied to the accumulator (2) with the pump (6, 10). A control apparatus (16) is provided for controlling (open loop and/or closed loop) the pressure in the accumulator (2) by a pressure control valve (4). With the control apparatus (16), the pressure control valve (4) can be closed when the engine is intended to be started but no rotational movement is yet present.

Abstract: A valve arrangement for a fuel injector arrangement, in which liquid fuel is drawn from a low pressure drain source and supplied from a pump at high pressure through a main fuel supply passage to an outlet of the injector arrangement. The valve arrangement includes a pressure regulating means which, during the course of an injection, regulates the pressure of fuel being supplied to the outlet. The pressure in the main fuel supply passage is regulated to a preselected pressure, which is intermediate drain pressure and pump supply pressure.

Abstract: A device for controlling the fuel pressure in a direct cylinder fuel injection engine, which suppresses the over-shooting or under-shooting of fuel pressure under a condition in which the fuel pressure is changing, in order to improve the response and stability. A control means 20A controls the fuel pressure by feedback so that a real fuel pressure PF comes into agreement with a target fuel pressure PFo, and includes a means 204 for operating the fuel pressure correction amount for variably setting a control gain for controlling the fuel pressure by feedback, the means for operating the fuel pressure correction amount so working as to change the control gain when the target fuel pressure has changed by more than a predetermined amount from a first control gain for when the fuel pressure remains steady over to a second control gain for when the fuel pressure changes.

Abstract: A one-piece non-magnetic poppet of a first material for controlling fluid flow. The poppet is moves from a first position to a second position. In the first position, the poppet plugs an aperture so as to resist fluid flow through the aperture. In the second position, the poppet is in a position that allows fluid flow through the aperture. The poppet may be coup led directly with an armature disposed within the housing.

Abstract: An electronic returnless fuel system for a vehicle includes a fuel pump to pump fuel from a fuel tank. The electronic returnless fuel system also includes a fuel rail fluidly connected to the fuel pump to distribute the fuel to an engine of the vehicle and a pressure transducer to sense pressure of the fuel from the fuel pump to the fuel rail. The electronic returnless fuel system includes a controller electrically connected to the pressure transducer and the fuel pump to control the pressure of the fuel from the fuel pump to the fuel rail at a set operating pressure. The electronic returnless fuel system further includes a pressure relief valve interconnecting the fuel pump and the fuel rail set a predetermined amount above the set operating pressure and at least one jet pump disposed in the fuel tank and fluidly connected to the pressure relief valve.

Abstract: A common rail fuel injection system for controlling the opening area of the fuel metering valve inserted in the fuel supply passage for supplying the fuel to the fuel injection pump to control, to a target pressure, fuel pressure in the common rail which holds the fuel delivered from the fuel injection pump. In the steady-state operation, the solenoid current is controlled by duty control at control frequency preset with an importance placed on the control stability. After determining the transient of control from the amount of change in the target common rail pressure which is a target of control, the control frequency is changed to a lower low frequency for a specific time until the common rail pressure reaches the target pressure. As a result, the valve body moves fast, thereby gaining a high control response despite of unsteady behavior of the valve body of the metering valve.

Abstract: The invention relates to a method for the diagnosis of a sensor in connection with control of a combustion engine. The method includes feeding fuel under pressure (p) to the engine, detecting the pressure (p) by means of the sensor, and controlling the air/fuel mixture based on to the operating state of the engine. The invention involves an intentional modification of both the pressure (p) and injection time period (tinj) during which fuel is fed to the engine. The modifications are selected in such a way that substantially no change in the fuel flow (F) to the engine is obtained. A check is performed to determine if the modifications of the pressure (p) and injection time period (tinj) result in any unallowable deviation in the operating state of the engine. If so, an indication that the sensor is defective is provided. With the invention, an improved diagnosis method for checking the functioning of a fuel pressure sensor is provided.

Abstract: A fuel pressure regulation system for use in a fuel pump system in which atomizing air is injected into the fuel delivered to the injector. The system includes both an air rail and a fuel rail and is operable to maintain the fuel pressure within the system at a consistent pressure above the air rail pressure. The system also includes a first pressure sensor, a second pressure sensor, a control circuit, and a fuel pressure pump or other fuel control device. The first and second pressure sensors are differential pressure sensors which measure the air and fuel pressure, respectively, convert those measurements into first and second electronic signals, and send those signals to the control circuit. The control circuit is an electronic circuit that includes a first stage, a second stage, and an output stage and provides the fuel pump with closed loop control based on the first and second signals.

Abstract: A high pressure pumping device having a body provided with a cylindrical seat and a piston mounted in an axially sliding manner in the seat in order to form a variable volume pumping chamber; the chamber being in communication with an intake duct, via which it is supplied with a fluid, and with a delivery duct along which there is disposed a one-way non-return valve in order to allow the fluid to flow from the pumping chamber along this delivery duct; the pumping device further comprising an electrovalve whose opening and closing is controlled, disposed along the intake duct in order to enable the fluid to flow from and to the pumping chamber, and a control unit adapted to control the opening of the electrovalve in order to cause a controlled quantity of fluid to flow back from the chamber to the intake duct, enabling the regulation of the quantity of fluid pumped, at high pressure, along the delivery duct.

Abstract: In an injection pressure control method of a GDI engine, an engine torque and an engine rpm are detected, then an initial stratified mode fuel pressure value is set according to the detected engine torque and engine rpm. Next, a weighting factor is calculated according to a variation rate in effective pressure of a combustion chamber of the engine, and a corrected stratified mode fuel pressure value is established by multiplying the wighting factor to the initial stratified mode fuel pressure value. Then, the corrected stratified mode fuel pressure value is compared with a current fuel pressure value, then a final fuel pressure value is obtained according to the comparision result.

Abstract: A pressure regulating valve that is used to regulate the pressure in a fuel reservoir and has a valve body in which a pistonlike valve member is disposed axially displaceably in a bore counter to the force of a closing spring. The valve member forms an armature of an electromagnet, which is supplied with current to reinforce the closing force of the closing spring. The valve member acts on a closing element, which is pressed against a valve seat by the force of the closing spring and the magnetic force and which is acted upon on an other end by the pressure in the fuel reservoir. The valve member has two axially offset guide portions, which are embodied as short cylinder portions and have a diameter that is only slightly smaller than the diameter of the bore. By way of its guide portions, the valve member is guided displaceably with defined contact in the bore.

Abstract: In a variable delivery fuel supply device providing a stable control of fuel pressure without being influenced by a scattering of control of an electromagnetic valve and without causing an increase of temperature in the coil of the electromagnetic valve, the variable delivery fuel supply device comprises fuel injection valves 1a-1d for injecting fuel to respective cylinders of an internal combustion engine, a fuel pump 3 which sucks fuel from a fuel intake passage 25 through an intake valve 26 into a pressurizing chamber 17 by a reciprocating movement of a plunger 15 in a cylinder 14 and discharges the pressurized fuel into the delivery pipe through a discharge valve 27, an electromagnetic valve 28 which is located in a relief passage 31 communicating the pressurizing chamber 17 of the fuel pump 3 with the fuel intake passage 25 and is adapted to control a discharge quantity of fuel by relieving the pressurized fuel in the pressurizing chamber 17 at the time of opening the valve, and a control unit 13 for sup

Abstract: A fuel injection apparatus for an internal combustion engine is provided which is designed to control a fuel discharge from a fuel injection pump by regulating the quantity of fuel sucked into the fuel injection pump. The fuel injection pump is driven in synchronism with rotation of the engine to pressurize and supply the fuel to an accumulator chamber from which the fuel is injected into cylinders of the engine. The solenoid valve moves a valve member linearly to open and close a fluid path leading to the fuel injection pump. The controller actuates the solenoid valve in one of a first control mode when the engine speed is low and a second control mode when the engine speed is high. In the first control mode, a valve on-duration in which the solenoid valve is turned on to open the fluid path through the valve member and an area of the fluid path opened by the valve member are both controlled. In the second control mode, only the opened area of the fluid path is controlled.

Abstract: In a control device for a high pressure injection nozzle including a housing, an actuating magnet structure disposed in the housing and including a magnetic coil, an armature movable relative to the coil, and a valve actuating bolt engaged by the armature and being spring-biased to a seated position in which the injection nozzle is closed, the armature is movably mounted on the armature bolt and a mass body is resiliently supported adjacent the armature so that, upon de-energization of the magnet coil when the armature and the spring biased bolt are released and the bolt reaches the seated position, the armature is free to continue to move for engagement with the mass body to which the mass impulse forces of the armature are transferred, whereby the mass forces generated by the bolt when being seated are reduced and the movement of the armature is damped.

Abstract: The solenoid valve has a fuel supply conduit, and a ball shutter controlled by an electromagnet and cooperating with a conical seat in the conduit. The conduit has fuel filtration means having a cylindrical wall with a number of openings for preventing particles of dirt from infiltrating between the seat and the shutter, without producing an excessive fall in fuel pressure. The thickness of the cylindrical wall is less than 1 mm, and the width of the openings is less than 0.25 mm.

Abstract: In a fuel pressure control system of a non-return system which feedback controls the fuel pressure supplied to a fuel injection valve to meet the fuel supply amount, a fuel pressure in a fuel supply passage is feedback controlled t become a pressure corresponding to the engine environmental temperature condition of during the engine operation stop.

Abstract: A fuel pressure control apparatus and method controls a pressure of fuel that is delivered from a fuel pump to a fuel pipe in an internal combustion engine of a vehicle. A controller of the fuel pressure control apparatus calculates a controlled variable based on at least an integral term that is updated in accordance with a difference between an actual fuel pressure in the fuel pipe and a target value thereof; and controls an amount of the fuel delivered from the fuel pump in a feedback manner, using the controlled variable, so that the actual fuel pressure approaches the target value. During the control of the fuel pressure, the controller inhibits updating of the integral term to a value that results in an increase in the amount of the fuel delivered from the fuel pump, when the amount of the fuel delivered is approximate to or equal to a maximum value thereof.

Abstract: A control for a pressure fluid supply system is described, in particular for the high pressure in a fuel injection system, for example for an internal combustion Diesel engine, by means of which the pressure in a common high-pressure line supplied by a high-pressure pump, i.e. in the common rail, to which individual consumers are connected, is controlled in accordance with the instantaneous pressure fluid requirements. For adapting the pressure in the common high-pressure line to the pressure fluid requirements of the consumers, i.e. the injection nozzles, a device for limiting the amounts of fluids conveyed is associated with the high-pressure pump, which has at least on adjusting element which can be changed by means of an adjusting signal representing the instantaneous pressure fluid supply situation in the common rail.

Abstract: A fuel supply device for an internal combustion engine of a motor vehicle has a supply container, a feeding aggregate which is electric-motor driven and feeds fuel from the supply container to an injection device of the internal combustion engine, a pressure sensor which determines a fuel pressure downstream of the feeding aggregate, a control device connected with the pressure sensor and controlling an operation of the feeding aggregate so that a fuel pressure is at least approximately below a nominal pressure, a throttled discharge arranged downstream of the feeding aggregate, a valve device operative for controlling the discharge depending on a fuel pressure and opening the discharge when a fuel pressure located under the nominal pressure is exceeded, and a check valve integrated in the feeding aggregate.

Abstract: A control arrangement for an internal combustion engine which includes a fuel supply system, an air/fuel ratio control system, an abnormality diagnoser which diagnoses a possible abnormality in the fuel supply system, when the pressure of the pressurized fuel in the fuel supply system detected by a fuel pressure senor exceeds predetermined upper and lower limits determined by a control duty for an electrically controlled pressure regulator, and an abnormal element decider which decides an abnormality either in the fuel pressure sensor or in the electrically controlled pressure regulator based on an amount representing an air/fuel ratio status including the actual air/fuel ratio and the air/fuel ratio feed back control amount extracted from the air/fuel ratio control system for the internal combustion engine, when the abnormality diagnoser diagnoses an abnormality in the fuel supply system.

Abstract: A hydraulically actuated fuel injector includes an injector body which has an outer surface. An armature cavity is defined by the injector body and a solenoid. The solenoid includes an armature, which is positioned within the armature cavity. Attached to the armature and positioned in the injector body is a valve member that defines a centerline. A plurality of evacuation passages which extend from the armature cavity to the outer surface are defined by the injector body. The armature and the evacuation passages are positioned on opposite sides of a plane that is oriented perpendicular to the centerline.

Abstract: A fuel pressure control apparatus for cylinder injection engine having a fuel injection valve for injecting fuel into a cylinder of an engine, a pipe for conducting the fuel to the fuel injection valve, a fuel pump for supplying the fuel from a fuel supply system to the pipe, a fuel pressure regulator for regulating the fuel pressure within the pipe by discharging the fuel from the pipe to the fuel supply system, and a control unit for making feed-back control on the fuel pressure within the pipe by applying a control signal determined on the basis of an engine operation parameter to the fuel pressure regulator, wherein the fuel pressure regulator is controlled in a feed-forward manner by a predetermined control value so as to make better fuel pressure control at the time of start and when the fuel pressure transiently changes.

Abstract: In a pressure-maintaining device for a fuel supply system of an internal combustion engine (1) of a motor vehicle, a pressure reservoir (5) is arranged in a supply line (7) leading to the internal combustion engine (1). The pressure reservior (5) has a pressure chamber (13), which is bounded by a movable wall (14) that is pretensioned by a compression spring (15). The position of the movable wall (14) is registered by a displacement transducer (18) and forwarded to a regulating device (12). The regulating device (12) regulates the rotational speed of a fuel pump (3) as a function of the position of the movable wall (14).

Abstract: A control method for controlling the fuel pressure within the common rail or accumulator of a fuel system whilst an associated engine is operating, the fuel system including a plurality of individually actuable fuel injectors arranged to receive fuel from the common rail, each injector including a control valve operable to control the fuel pressure within a control chamber, fuel escaping from the control chamber being returned to a fuel reservoir, the method comprising: monitoring the fuel pressure within the common rail; controlling the rate of fuel supply to the common rail; and relieving the common rail fuel pressure in the event that the common rail fuel pressure exceeds a predetermined threshold by actuating the control valve of at least one of the injectors to allow fuel to flow from the common rail, through the control chamber of the injector to the fuel reservoir, the control valve(s) being arranged to control the fuel pressure within the control chamber(s) of the said at least one of the injectors

Abstract: A fuel delivery systems with first and second fuel pumps connected in series in which, a satisfactorily precise regulation of the fuel quantity supplied by the second fuel pump is possible. In particular, a switching time of a control valve that controls the fuel quantity is very short. The control valve includes an electromagnet which holds the valve member in a starting position. The electromagnet is supplied with just enough current that the valve member remains in this position. A slight change of the current supply of electromagnet can then cause the switching of the control valve into the end position within an extremely short period of time. The fuel delivery system is provided for an internal combustion engine of a vehicle.

Abstract: The purge valve embodies a solenoid that has a linear force vs. current characteristic acting on the armature. Effects of hysteresis are minimized by certain constructional features and the manner of operating the valve by an associated control circuit.

Abstract: A fuel injection valve for internal combustion engines, having an axially displaceable valve member which is disposed in a valve body. On an end toward an engine combustion chamber the valve member has a conical valve sealing face with which the valve member cooperates with a conical valve seat face on the valve body for controlling an injection cross section. Via an internal guide the valve member is guided slidingly displaceably on a tang of a stationary insert body.

Abstract: Pressurized fuel of a common rail is introduced into a control chamber of a fuel injector. An electromagnetic valve opens or closes a fuel discharge passage of the control chamber to adjust a hydraulic pressure of the control chamber. Through a switching leak passage, bubble-containing fuel directly returns from a valve opening of the electromagnetic valve to a low-pressure return passage without passing through an armature chamber. Through a stationary leak passage, the fuel leaking from every slide portion returns to the return passage via the armature chamber. A downstream portion of the stationary leak passage opens to the upper portion of the armature chamber. A damper element is provided downstream of the electromagnetic valve in the return passage for canceling an increased fuel pressure.

Abstract: A fuel regulation apparatus of an engine for a model which is possible to regulate the flow rate of the fuel according to the rotational frequency of the engine is provided. A main body 31 of a fuel regulation apparatus 30 is provided with a fuel inlet 32, a fuel outlet 33, and an air inlet 42 to which air pressure from a crankcase is applied. The inlet 32 and the outlet 33 are connected therewith through a passage 34 having a seat face 37. A regulating valve 35 is placed in the passage 34 to close the seat face 37. A spring 38 pushes the regulating valve 35 in such a direction as to close the seat face. The other end of the regulating valve 35 is in contact with a piston 39. A position of an air inlet 42 can be adjusted by a screw 43. The spring pushes the piston 39 in such a direction as to open the seat face 37. The outlet 33 is connected to a fuel injection apparatus. The fuel injection apparatus injects the fuel into a crankcase.

Abstract: A high-pressure fuel supply assembly includes a high-pressure fuel pump for pressurizing fuel from a low-pressure fuel intake passage and discharging high-pressure fuel into a high-pressure fuel discharge passage, a high-pressure damper disposed in the high-pressure fuel discharge passage for absorbing surges in the high-pressure fuel, a high-pressure regulator disposed in a branch passage branching from a branch portion of the high-pressure fuel discharge passage for adjusting the high-pressure fuel from the high-pressure damper to a predetermined pressure, and an orifice disposed in the high-pressure fuel discharge passage downstream from the branch portion for absorbing surges in the high-pressure fuel.

Abstract: A fuel supply system for a direct injection gasoline engine can be used in a variable fuel pressure system without using a large pulsation absorber and, as a result, is inexpensive and can be easily reduced in size. The fuel supply system for a direct injection gasoline engine includes a single-cylinder high-pressure pump, a resonator for suppressing the pressure pulsation of high-pressure fuel supplied from the high-pressure fuel pump, and a high-pressure variable regulator for variably changing the pressure of the high-pressure fuel. The fuel-supply system directly injects the high-pressure fuel into the cylinders of the engine through injectors.

Abstract: A variable delivery fuel supply device capable of obtaining a stable fuel pressure even in a case of inoperability of an electromagnetic valve and capable of improving the durability of the electromagnetic valve, which comprises fuel injection valves 1a through 1d for injecting fuel to respective cylinders of an internal combustion engine, a delivery pipe 2 connected with the fuel injection valves 1a through 1d, a fuel pump 3 which sucks fuel from a fuel intake valve into a pressurizing chamber 23 by a reciprocating action of a plunger 21 in a cylinder 20 and supplies the pressurized fuel into the delivery pipe 2 through a discharge valve 31, an electromagnetic valve 32 located in a relief passage 35 communicating the pressurizing chamber 23 of the fuel pump 32 with the fuel intake port 27 and is adapted to control a discharge quantity of the pressurized fuel by relieving the pressurized fuel in the pressurizing chamber 23 into the fuel intake port 27 at the time of opening the valve to thereby control a fuel

Abstract: Disclosed is a common-rail fuel injection system which regulates an amount of fuel delivered at every plunger in a high-pressure fuel-supply pump, thereby enabling to control an actual common-rail pressure restored at every fuel delivery forced by the plunger so as to come in matching a desired common-rail pressure. A fundamental desired amount of fuel delivered is found dependent on the desired common-rail pressure derived from the engine operating conditions. A correction amount of fuel delivered is calculated at every plunger on the basis of a deviation in the common-rail pressure, which is derived from the actual common-rail pressure restored with the fuel delivery and sensed at every fuel delivery. Each plunger delivers under pressure an ultimate amount of fuel that is compensated with the correction amount of fuel delivered, thereby making the common-rail pressure coincide with the desired common-rail pressure.

Abstract: A fuel supply system for supplying fuel to the cylinders of an associated engine is disclosed. The system comprises a fuel pump for supplying high pressure fuel to a delivery line, a plurality of injectors connected to the delivery line and means operable to deliver fuel through the injectors to respective cylinders of an associated engine, and a control valve connected to the delivery line and operable to control the pressure of fuel within the delivery line.