Abstract: A hydraulically-actuated electronically-controlled fuel injection system includes a solenoid operated main valve that controls the flow of actuating fluid to the individual injectors. The flow of pressurized actuating fluid pressurizes the fuel and causes injection to occur. The present invention accomplishes pilot injection and/or other injection rate shaping by constricting the flow of pressurized actuating fluid to the piston pump chamber of the individual injectors during a portion of each injection cycle. Constricting the flow of pressurized actuating fluid is accomplished by a separately controlled solenoid valve preferably positioned between the actuating fluid manifold and the main control valves of each individual injector.

Abstract: A high pressure pump for an engine fuel injection system, wherein the pump has a plurality of positive displacement pumping devices that are operating so that their delivery cycles overlap and so that the instantaneous speed of the pumping devices during their delivery strokes is constant so as to minimize pressure variations in the system and avoid the necessity of having the pump being driven in synchronized relationship to the engine output shaft. This permits the use of a variable speed drive so that the pump can be driven at speed ratios depending upon engine demand and/or eliminates the necessity for positive drives to maintain synchronization. A number of embodiments showing different pump configurations are disclosed.

Abstract: A fuel injector is actuated by cylinder compression pressure acting against the exposed face (31) of piston means (30, 35) to compress fuel in high pressure chamber (45) in injector body (10). The piston means (30, 35) moves against spring (36) and controllable fuel pressure in low pressure chamber (37). The high pressure chamber (45) communicates with injection orifice (68) via delivery chamber (65) and non-return delivery valve (56). Fuel delivery is regulated by varying fuel pressure in low pressure chamber (37) and various means are disclosed for controlling this pressure.

Abstract: In one aspect of the present invention a method is disclosed that controls the pressure of actuating fluid supplied to a hydraulically-actuated injector. A target time duration in which fuel is to be injected is determined, and compared to the actual time duration to determine a desired actuating fluid pressure in order to control the fuel injection rate.

Abstract: A fuel injection control apparatus that is used in a diesel engine or the like, controls a fuel injection rate by adjusting the injection valve opening pressure of a injection nozzle. A plurality of different thresholds are set and compared with a signal indicative of the injection rate in order to identify a reference injection start time and an initial injection rate control period. The injection timing and the injection valve opening pressure of the injection nozzle are controlled in such a manner that these identified time and period will match an optimal initial injection rate control period and an optimal reference injection start time which are stored in memory in advance for individual sets of operating conditions. With this, the optimal injection state can be achieved during the initial stage (initial injection rate control period) of the injection period.

Abstract: In one aspect of the present invention, a method is disclosed that controls the pressure of actuating fluid supplied to a hydraulically-actuated injector. A target engine speed acceleration is determined, and compared to the actual engine speed acceleration to determine a desired actuating fluid pressure in order to control the fuel injection rate to start the engine.

Abstract: In one aspect of the present invention, a method is disclosed that controls the actuating fluid pressure supplied to a hydraulically-actuated injector and the time duration over which the hydraulically-actuated injector injects fuel. The desired actuating fluid pressure and injection duration is swept across a range of values to achieve an optimum combination of values to start an engine.

Abstract: Fuel delivery system for internal combustion engines and method of delivering fuel by the automatic selection and use of different sections of the fuel pumping ramp of a cam mechanism within the system to control the rate of fuel injection by varying and shaping injection pressure waves or pulses to match engine air intake flow for different engine speed and load conditions. A solenoid operated fuel delivery valve is employed for controlling fuel timing and quantity by commands from a microprocessor with inputs which includes torque demand, engine speed, cam mechanism position and solenoid current regulator signals.

Abstract: A cam shaft reduces noise produced by gears used to drive cams of a fuel injection pump. Conventionally, the gear noises are caused by negative torque of a cam shaft. A cam profile of each cam which lifts a plunger of the fuel injection pump is shaped like a fan. There are formed two cams in a single cam shaft. A lift increment segment of a first cam overlaps a lift decrement segment of a second cam to prevent a negative torque.

Abstract: A fuel injection system has a fuel injection pump (1) having a plunger (1A) disposed in a pressure chamber (1D) and actuatable by a cam (2), and a solenoid-operated valve (6) connected to an injection pipe (4) communicating between the fuel injection pump (1) and a fuel injection nozzle (3), the solenoid-operated valve (6) being disposed near the fuel injection nozzle (3). A controller (C) has an injection advance map and an injection period map both depending on the rotational speed (9) of an engine and the load (10) on the engine. The controller (C) opens and closes the solenoid-operated valve (6) for controlling the supply of fuel from the fuel injection pump (1) to the fuel injection nozzle (3). Since the solenoid-operated valve (6) is disposed near the fuel injection nozzle (3), the fuel can well be cut off when the injection of the fuel is finished, thus reducing HC in exhaust gases and improving fuel economy.

Abstract: A fuel injection pump for internal combustion engines for controlling the fuel quantity with an electric closed-loop control device, which controls an electric positioner, which in turn actuates an element that determines the fuel injection quantity per pump piston supply stroke. The supply of fuel to the pump work chamber is effected via a fuel supply line, in which an adjustable throttle is disposed. The throttle is actuated in accordance with the position of a gas pedal, but it controls an increasingly larger through cross section of the fuel supply line than would correspond to the fuel metering by the closed-loop control device. A minimum through cross section is defined by a fixed throttle. With this apparatus, emergency operation if the electric control system for the fuel injection quantity fails can be attained, without the apparatus for emergency operation interfering with fuel metering by the closed-loop control device.

Abstract: A Diesel fuel injection device has a pressure accumulation piping for accumualting a fuel at a high pressure and an injector for injecting the fuel supplied by the pressure accumulating piping. The injector including a nozzle needle operative to open and close an injection orifice and a three-way solenoid valve operative to control the fuel pressure acting on the nozzle needle. The three-way solenoid valve is controlled to actuate the nozzle needle and to cause the fuel in the pressure accumulation piping to be injected through the injection orifice. A control valve is provided to control the injection rate characteristic to provide a boot-type injection characteristic.

Abstract: An accumulator type fuel injector and method of operating it wherein the injection timing is held substantially constant relative to output shaft angle beginning of the range of 5.degree. before top dead center to top dead center and is closed within the range of 25.degree. to 35.degree. after top dead center and wherein the amount of fuel injected is controlled primarily by varying the pressure of the fuel delivered to the accumulator chamber. Various valve lift characteristics may be employed with conjunction with the invention.

Abstract: A method for varying the flow rate of fuel in a distributor-type electronic control fuel-injection pump. A single solenoid valve is used to control the timing of initiating and terminating fuel delivery. A cam is operated under four different modes, a low idle or a low speed/low load zone, a middle load zone, a high load zone, and a governing or high idle zone in that order as the cam is rotated. At the governing or high idle zone, the solenoid valve is closed before the cam is lifted and is opened to control fuel delivery when it is terminated.

Abstract: An arrangement for open-loop control or closed-loop control of a diesel internal combustion engine is described wherein the course of injection is electronically open-loop controllable and/or closed-loop controllable. For this purpose, a metering valve is multiply clocked for each metering cycle. In this way, the course of injection can be formed within wide limits in any desired manner. Furthermore, the unit chamber pressure can be controlled.

Abstract: A variable discharge high pressure pump for pumping a fuel into a common rail of a common rail type fuel injection system has a plunger reciprocable in a cylinder bore and a pumping chamber defined between and end face of the plunger and the inner peripheral surface of the cylinder bore. A solenoid valve has a valve member movable into an open position in which the valve member is moved out of engagement with an associated value seat into the pumping chamber when the solenoid valve is deenergized. When the solenoid valve is energized, the valve member is moved into a closed position in which the fuel pressure in the pumping chamber acts on the valve member to urge the same into engagement with the valve seat. The plunger is of a simple cylindrical structure free from any lead formed therein.

Abstract: A unit fuel injector adapted to receive fuel from a fuel supply at relatively low pressure and adapted to inject fuel at relatively high pressure into the combustion chamber of an internal combustion engine is provided, comprising an injector body having a first internal bore and an injector orifice and a plunger mounted for reciprocating movement within the first internal bore to define a variable volume fuel pressurization chamber including a cam actuated upper plunger portion and a lower plunger portion mounted in the first internal bore between the variable volume fuel pressurization chamber and the upper plunger portion. While the upper plunger portion is in its retracted position, low pressure fuel from the fuel supply is supplied to the variable volume fuel pressurization chamber.

Abstract: For the sake of improving quiet operation during idling and at low partial load by lengthening the injection duration, a fuel injection pump for internal combustion engines has a relief conduit originating in a pump work chamber, the relief conduit including a throttle and being blockable at upper partial load, full load and openable by a control slide. The relief conduit is controlled by a pressure maintenance valve, the opening pressure of which can be adapted from outside to the opening pressure of injection nozzles. The control slide is controlled by a centrifugal governor in such a manner that at idling and lower partial load. The control slide is shifted by the pressure in a fuel low-pressure chamber into its operating position that uncovers the relief conduit, and at upper partial load, full load and starting, the control slide is disconnected from the low-pressure chamber, so that it can drop back into its basic position that blocks off the relief conduit.

Abstract: Fuel injection equipment for an internal combustion engine is modified by connecting a closed chamber (28) via a permanently open flow restriction (29) either to the working chamber (11) of a fuel pump (1), or to a high pressure fuel supply connection (36) between the output of the working chamber (11) and a fuel injector (39), or to a pressurized fuel supply passage (55) in the injector upstream of an injector valve (48). The volume of the closed chamber (28) and the cross sectional flow area of the restriction (29) are selected to allow a predetermined volume of pressurized fuel to flow into the closed chamber (28) when the equipment is operating, thereby reducing the flow of fuel through the injector valve (48) during the initial period of injection.

Abstract: A fuel injection system for internal combustion engines, having a pump chamber defined by the pump piston and a pressure chamber adapted to communicate with the injection nozzle; and further including an intermediate piston disposed between the two work chambers, in which during the compression stroke of the intermediate piston a throttle conduit which branches off from the pump chamber can be opened, in order to allow some of the fluid to flow out of the pump chamber while leaving the injection quantity located in the pressure chamber unchanged, to thereby attain a lengthening of the injection duration.

Abstract: A control device for a piston of a fuel injection pump actuated by a push rod and a cam, wherein the cam profile successively comprises: a slope which causes the piston to advance rapidly; a slope which causes the piston to return slowly until it covers a fuel supply port; a slope which causes the piston to return rapidly; a level stage; and, finally, a slope which causes the piston to continue the return stroke.

Abstract: A unit fuel injector for a fuel injection system for an internal combustion engine is described that is reciprocably driven from a camshaft by a drive train, and the unit injector includes a device for controlling the rate of fuel injection into an engine cylinder. The rate control device operates to divert or bleed off a quantity of fuel from the main metering chamber of an open-nozzle type fuel injector during an initial phase of injection, and the diverted fuel is returned to the metering chamber at a later phase in the injector operation. The rate control device includes an auxiliary metering chamber which receives the diverted fuel via an auxiliary passageway. An auxiliary plunger is mounted within the auxiliary metering chamber. A biasing device such as a helical spring or a fluid pressure spring, controls the inward and outward movement of the auxiliary plunger.

Abstract: A fuel injection system for internal combustion engines, which has a fuel injection pump and an additional device for varying the injection quantity pumped to the injection nozzle from a pump work chamber; the additional device has a blocking piston acted upon from the pump work chamber, the deflection stroke of which is controlled by an electrically controlled valve by means of which the injection duration or the injection quantity can be controlled. The operative face on the blocking piston facing the pump work chamber is smaller than the face facing the control valve and the control valve is embodied as an ON/OFF valve.

Abstract: A hole type fuel injector with a nozzle body and needle valve having cooperating inner and outer metering rings providing a metering passage (a) to provide an initial reduced rate of fuel injection during an initial increment of valve lift, (b) to maintain fuel pressure at the valve seat to reduce fuel dribble and cavitation erosion during a corresponding last increment of valve closure and (c) to prevent secondary fuel injection.

Abstract: A fuel pumping apparatus for supplying fuel to an internal combustion engine includes a pumping plunger mounted in a bore and movable inwardly by an engine driven cam to displace fuel through an outlet to an injection nozzle. The quantity of fuel supplied to the nozzle is controlled by a spill valve. The apparatus also includes a restricted flow path through which fuel can flow to reduce the initial rate of fuel delivery through the nozzle, the flow path including a valve formed by the plunger and the bore so that fuel can flow through the flow path only during the initial inward movement of the plunger.

Abstract: A fuel injection pump for internal combustion engines comprising a pump plunger displaceable in a pump cylinder for delivering fuel to a plurality of injection locations, and elements for controlling fuel injection quantity. The controlling elements include a relief channel in the pump plunger for communicating a pump working space defined by the pump plunger with a relief chamber, an outlet port on an outer surface of the pump plunger for communicating the relief channel with the relief chamber, at least two connecting cross-sections of different shape for communicating the relief chamber with the outer port, and a slide valve displaceable along the outer surface of the plunger and having a control edge for controlling flow of fuel through the connecting cross-sections during a delivery stroke of the pump plunger.

Abstract: A cam for controlling the injection rate of fuel in a fuel injection system having a four part cam profile is disclosed. The first 120.degree. is the plunger advancement segment. The next 80.degree. is the advanced dwell segment. The next 100.degree. is the plunger retraction segment and the last 60.degree. is the retracted dwell segment. The plunger advancement segment is divided into three subsegments: pre-injection stroke, injection stroke, and overtravel stroke. The pre-injection subsegment achieves minimum velocity and acceleration at the start of injection. In the injection subsegment, the cam follower acceleration is achieved as rapidly as can Hertz stress permits to increase the injection pressure and to achieve the maximum injection rate. The overtravel subsegment achieves a sharp and clean end of injection. Preferably, this cam causes injection of less than 20 mm.sup.3 of fuel per stroke during the first ten cam angle degrees of cam rotation.

Abstract: A pump nozzle for a diesel engine, in which an injection pump element including a pump piston driven by a cam-shaft via a thrust element and a pump element bushing is combined with an injection nozzle to provide a unit to be associated to one motor cylinder. The pump piston is surrounded by a control sleeve which is non-rotatable relative to the pump element busing. The pump piston can be rotated for adjusting its orientation relative to the control sleeve for the purpose of adjusting the supplied amount of fuel. An adjuster for adjusting the amount is disposed at substantially the same level as of the thrust element. The control sleeve is arranged completely within a pump spring, which partly surrounds the pump element bushing. The pump dement bushing is formed integrally with a blind longitudinal bore which receives the pump piston. The pump spring extends from the level of the adjuster for adjusting the amount of fuel to be injected per injection, to the level of the working chamber of the pump piston.

Abstract: A fuel injector train having a variable injection rate includes a fuel injector having a plunger and a plunger biasing device having a predetermined spring rate for controlling the injection rate of the injector. A cam assembly is mounted to impart force through a push rod to a rocker arm which communicates the force of the cam assembly to the fuel injector plunger. In some embodiments, the push rod collapses axially a short distance in response to axial force applied thereto. The push rod has an inherent bias against collapsing that is less than the total bias of the injector biasing device so that during a portion of the injection cycle, part of the force imparted to the push rod collapses the push rod to operate the injector at a reduced rate. In another embodiment, the rocker arm is formed with a closable gap between its first and second ends, and the gap has an inherent bias against closing that is less than the total bias of the fuel injector biasing device.

Abstract: A fuel injection system for an internal combustion engine and a method of controlling fuel injection according to which a predetermined fuel quantity is delivered from a high-pressure pump to the internal combustion engine, first and second return flow quantity are returned through first and second relief ducts, the second relief duct including a control throttle having a constant cross-section, and an electronic control unit controls flow delivery in accordance with characteristic values including those of the internal combustion engine, the pump, and a quantity measuring device for measuring the second return flow, and in accordance with the predetermined fuel delivery quantity also used as a characteristic value.

Abstract: The pump of the invention has application as a fuel pump for delivering fuel over a range of flow rates to an internal combustion engine. The pump may however be employed in many other applications, such as chemical applications, medical applications and hydraulic applications for example, particularyly where fine control of the fluid flow rate and a fast response from the pump to flow rate change requirements is necessary.

Abstract: An electrostrictive actuator which can be used, e.g., in a distributor type fuel injection device of a diesel engine has an electrostrictive actuator for generating an electric charge upon reception of a load and an electric circuit unit connected to the electrostrictive actuator. The electric circuit unit has an electric charge changing means for changing the electric charge of the electrostrictive actuator in the state of generation of electric charge due to a load exerted on the electrostrictive actuator and thereby constricting the electrostrictive actuator, and an electrical charging means for charging the electrostrictive actuator in the state of constriction due to the operation of the electric charge changing means when the load exerted on the electrostrictive actuator is reduced and thereby extending the electrostrictive actuator.

Abstract: A fuel injection pump includes a plunger reciprocable by an engine driven cam in a bore from which extends an outlet connected in use to a fuel injection nozzle. A spill valve is utilized to control the fuel flow to the nozzle by diverting fuel from the outlet to a low pressure source. In order to prolong the valve closure period a cylinder is provided in which is located a spring loaded piston. When the valve is closed a predetermined volume of fuel is passed to the cylinder to achieve displacement of the piston after which delivery of fuel takes place through the nozzle. The period of closure of the valve in order to achieve delivery of a specific volume of fuel through the nozzle is therefore extended.

Abstract: A fuel injection pump of the distributor type in which a pump piston is driven to reciprocate and rotate simultaneously, thereby acting as a distributer. For fuel injection quantity regulation, an annular slide that is displaceable on a pump piston is provided, by way of which the pump work chamber can be relieved. To attain a low injection rate in the idling range, in addition to a first outlet opening, controlled by an upper edge of the annular slide, second outlet openings axially offset from the first are provided, for a relief conduit of the pump work chamber which cooperate with a radial control opening, which communicates with the pump suction chamber and is disposed in the wall of the annular slide. In the opening direction of this control opening, a groove provided with a throttle is provided, by way of which during idling operation, prior to the opening of the first relief opening, fuel can flow out of the pump piston in order to decrease the pumping rate of the pump piston.

Abstract: A pneumatically operated fuel injection pump has a work chamber which is partitioned by a membrane into a pulse chamber and a return chamber. The pulse chamber is charged with crankcase pressure from a two-stroke engine while a counterforce is built up in the return chamber which varies with rotational speed. A counterforce is developed by means of a precise pressure control in the return chamber which makes possible a highly precise injection adapted to rotational speed. For this purpose, the return chamber is connected with an adjusting volume via a throttled flow path. In addition, a leaf spring is mounted in the return chamber and is utilized as a return spring for the membrane.

Abstract: An electronic unit injector employs an expandable chamber which expands as pressure in the injector increases between a pair of threshold pressures. The expansion of the chamber results in a two-phase rate of injection of the injector whereby the initial injection rate is significantly lower than the second injection rate. In one embodiment, the expandable chamber is formed by a pin which is displaceable in a cap mounted to the injector body. The pin bottoms against the cap to define the phase transition.

Abstract: The invention is directed to a fuel injection arrangement for two-stroke engines for portable tools such as motor-driven saws. In known fuel-injecting arrangements, the injection pump is driven by the pressure of the crankcase. The crankcase pressure increases up to a maximum value which remains constant starting with a predetermined rotational speed up to and including the maximum rotational speed. When the peak pressure of the crankcase is constant, the stroke of the pump piston of the injection pump is also constant and so is the quantity of fuel which is pumped. However, at higher speeds where the speed is increasing because of throttling in the air intake channel, the air charge of the cylinder reduces and an overrich mixture is formed. The fuel injection arrangement of the invention provides for an automatic reduction in the quantity of fuel injected at high and at the highest speeds.

Abstract: First and second cam members are engageable in a fuel injection pump. A first device urges the first cam member toward the second cam member to obtain engagement between them. The first cam member reciprocates as it moves relative to the second cam member when the first and second cam members are in engagement. A plunger connected to the first cam member reciprocates with the first cam member. The plunger defines at least part of a pumping chamber which contracts and expands as the plunger reciprocates. As the pumping chamber expands in a fuel intake stroke, fuel moves into the pumping chamber. As the pumping chamber contracts in a fuel compression stroke, the fuel moves out of the pumping chamber. A second device resists movement of the plunger in the fuel compression stroke.

Abstract: Device for injecting of fuel into internal combustion engines with an injection jet is provided with a stretched tension wire as a locking spring element for an outwardly opening valve locking member. The pretension of the tension wire is influenced by the current flow in an electrical current circuit which is fed to an electric resistor element being installed into the injection jet. The resistor element may be formed by the tension wire itself or by coil of an electromagnet, whose anchor is coupled with the tension wire. Thus, the opening pressure (P.sub.o) of the injection jet or the injection process can be controlled in a simple manner or may be formed accurately in accordance with a predetermined principle.

Abstract: A fuel injection pump of the distributor type in which to attain low injection rates in the idling range, longitudinal slits or longitudinal conduits are provided in the jacket face of the pump piston in accordance with the number of supply strokes of the pump piston. The slits or conduits are in continuous communication with an annular groove and the adjoining annular slide which is the quantity adjusting device of the fuel injection pump. The slits on conduits come in turn into communication with a control opening during the supply stroke of the pump piston via which opening the pump work chamber can be relieved whenever in the course of the pump piston stroke movement a second outlet opening of a relief conduit extending in the pump piston and communicating with the pump work chamber, comes into communication with the annular groove.

Abstract: A drive circuit for an electrostrictive element actuator for a fuel injection apparatus of a diesel engine. The drive circuit has a condenser adapted to be charged with electric charges generated by the electrostrictive element actuator; a combination of an electric charge transferring switching element and a rectifier element for becoming conductive in a first period and charging electric charges generated by the electrostrictive element actuator to the condenser; and a combination of an electric charge returning switching element and a rectifier element for becoming conductive in a second period, other than the first period, and returning electric charges stored in the condenser to the electrostrictive element actuator.

Abstract: An electrostrictive actuator which can be used, e.g., in a distributor type fuel injection device of a diesel engine has an electrostrictive actuator for generating an electric charge upon reception of a load and an electric circuit unit connected to the electrostrictive actuator. The electric circuit unit has an electric charge changing means for changing the electric charge of the electrostrictive actuator in the state of generation of electric charge due to a load exerted on the electrostrictive actuator and thereby constricting the electrostrictive actuator, and an electrical charging means for charging the electrostrictive actuator in the state of constriction due to the operation of the electric charge changing means when the load exerted on the electrostrictive actuator is reduced and thereby extending the electrostrictive actuator.

Abstract: A fuel injection system comprising a fuel injection pump, at least one fuel injection nozzle connected thereto, and a control device for varying the rate of injection of the system according to varying engine parameters. The control device has a variable volume chamber, the volume of which is varied by a piston located by a piezoelectric actuator. The variable volume chamber and a pumping chamber of the pump is intermittently connected by a passage which is specifically designed in such a manner that the fluid communication between the chambers, during the delivery stroke of a pump plunger, is provided only for an initial stage of the delivery stroke. A rate of injection is controlled in the initial stage to perform a pilot injection.

Abstract: A control system for at least one fuel injector in an electronic fuel injection system for a heat engine in which the injector has a linear operating time range defined by a minimum opening time (MIT) and a minimum rest time (MIOT). The system includes a first processor for determining a theoretical injector opening time (TJ), and a second processor directing asynchronous opening of the injector with respect to the phase of the engine, subject to the criteria that the minimum opening and rest times are maintained, while the same linear proportion between the opening and closing time of the injector is also maintained, to ensure that the operating time does not exceed this linear range.

Abstract: A fuel injector having therein a pressure chamber connected to a nozzle bore. Fuel in the pressure chamber is pressurized by a plunger driven by an engine and is injected from the nozzle bore when the pressure in the pressure chamber exceeds a predetermined pressure. The volume of the pressure chamber is controlled by a piston device actuated by low pressure. The movement of the piston device prevents the injection of fuel. The injection of fuel is stopped by causing the piston device to move relatively freely.

Abstract: An injector system for injecting fuel and/or water into the combustion chamber of an engine cylinder having a high pressure pump with a primary piston for pumping fluid to an injector nozzle and plurality of integral control cylinders having means for discretely controlling the displacement of pistons in the control cylinders for altering the effective volume of fluid pumped by the primary cylinder, the fluid pumped hydraulically displacing an injector piston in the injector nozzle for displacing a nozzle discharge stem allowing a divergent spray of fuel and or water to enter the combustion chamber, wherein the high pressure pump includes an associated regulating mechanism for displacing at least one control cylinder piston according to an input derived from the operator's power demand and the engine r.p.m.

Abstract: A fuel injection pump for internal combustion engines having a pump piston defining a pump work chamber and having control of the injection quantity by the opening, during the compression stroke of the pump piston, an axially displaceable regulating slide disposed about the pump piston, and of a relief conduit extending in the pump piston and discharging into the jacket face of the pump piston. Upon the opening, the relief conduit discharges into an outflow conduit provided between the pump piston and the regulating slide; at the onset of the opening stroke this conduit is fully opened, and during the course of the stroke it is throttled.

Abstract: A fuel supply device in which a regulator pressurizes fuel fed to a fuel injector to adjust the fuel to a predetermined pressure according to an engine condition. The regulator has a piston in a housing to form a control chamber and a high pressure chamber therein. The high pressure chamber is communicated with the fuel injector and a pump chamber of a high pressure pump discharging a highly pressurized fuel. The control chamber is connected to a pressure source generating a high pressure according to an engine condition. The piston moves in response to the pressure in the control chamber to pressurize the fuel in the high pressure chamber.

Abstract: A fuel injection pump for an internal combustion engine comprises a cam disc having a camming surface which, when the cam disc is rotatively driven, causes a plunger to be rotated and reciprocated to allow drawn fuel to be pressurized and distributed, to thereby deliver the pressurized fuel to the engine. The camming surface is configured such that the plunger is moved substantially at a constant velocity for the engine idling, and after the termination of the constant velocity region the velocity of movement of the plunger is increased to a highest value higher than that for the engine idling, and before entering the constant velocity region the plunger is moved at a velocity higher than the above constant velocity but lower than the highest value.

Abstract: A hole type fuel injector with a nozzle body and needle valve having cooperating inner and outer metering rings providing a metering passage (a) to provide an initial reduced rate of fuel injection during an initial increment of valve lift, (b) to maintain fuel pressure at the valve seat to reduce fuel dribble and cavitation erosion during a corresponding last increment of valve closure and (c) to prevent secondary fuel injection.