Abstract: A fuel injection pump for internal combustion engines is proposed, in which for normal engine operation the control of the injection quantity and of the beginning and end of supply for injection is effected by means of a control slide which is axially displaceable on the pump piston and in which a radial bore (connecting conduit) controlled by the pump piston is present in the pump cylinder, with which radial bore the pump work chamber can be made to communicate with the suction chamber of the pump. The latest end of supply for the injection is determined in that after a predetermined stroke of the pump piston a relief conduit is arranged to coincide with the radial bore and thereby relieve the pump work chamber. Because the radial bore is only blocked after a pre-stroke has been executed by the pump piston the earliest supply onset also can be controlled with this bore as well.

Abstract: A fuel injection pump for internal combustion engines, in which at least during normal engine operation the injection quantity is effected by controlling a fuel quantity control conduit which is provided in the pump piston in communication with the pump work chamber, via a control slide that is displaceable on the pump piston in cooperation with fuel quantity control openings, the axial position of the control slide determining the onset and end of supply. The earliest possible supply onset is further determined by a supply onset control opening disposed in the pump piston, which opening is sealed by entering into the cylinder liner after a pre-determined stroke extent has been traversed. Subsequent to this entry, an injection pressure can build up in the pump work chamber.

Abstract: A fuel injection pump has a work space which at a certain position of the pumping piston communicates with a tapping opening through which delivered fuel flows into an offtake space. The angular position at which the connection between the pumping space and the fuel offtake space is established, is adjustable in order to control the amount of injected fuel. The fuel offtake space is adjustable by means of a spring-biased piston. The position of the tapping opening to a distributing channel is adjustable by a movable supporting member communicating with a rotary distributor.

Abstract: A unit injector for an internal combustion engine has a solenoid valve for closing a fuel overflow passage to determine the injection timing and the injection quantity. A pumping plunger has its outer peripheral surface formed with first and second longitudinal slits both communicating with the plunger chamber, and a circumferentially extending suction slit communicating with the first longitudinal slit and registrable with a fuel intake passage when the plunger is in an extreme position remote from the plunger chamber. The plunger can assume selectively a normal operating position, a starting position, and an emergency stopping position, at respective different circumferential positions thereof. In the normal operating position, the plunger chamber communicates with the fuel intake passage through alignment of the first longitudinal slit or the suction slit with the fuel intake passage, and also communicated and with the fuel overflow passage via the second longitudinal slit.

Abstract: A fuel injection pump for internal combustion engines is proposed, which is embodied as a radial-piston/distributor pump, having an axially fixed and rotationally driven distributor, on the end of which that is remote from the drive and protrudes freely out of the distributor cylinder guiding the distributor an annular slide is disposed, which can be both rotated and axially displaced by means of adjusting drives. Both the quantity adjustment and control of the instant of injection are effected in a electrically controlled manner by relief openings provided on the distributor and control openings which are provided on the annular slide. All of the foregoing can be effected precisely on the end of the distributor which is free of moment.

Abstract: An apparatus for controlling fuel injection timing, for use in a fuel injection pump of a diesel engine, comprises a toothed wheel coaxially and fixedly mounted on a drive shaft of the fuel injection pump, first and second detectors for detecting the rotational position of the tooth wheel, and a control unit, having a microcomputer, for actuating a fuel injection timing changer of the pump according to the phase difference between signals from the first and second rotational position detectors for controlling fuel injection timing. The first rotational position detector is fixedly mounted on a pump housing and the second rotational position detector is fixedly mounted on a member rotatably provided around the drive shaft of the pump. The member is generally used for converting the rotational movement of the drive shaft to the reciprocation of a plunger of the pump which supplies fuel into cylinders of the engine. The phase difference corresponds to the actual injection timing condition.

Abstract: Disclosed is a fuel injection quantity control system incorporated with a fuel injection pump with a solenoid-operated spill valve wherein a control signal is generated for cutting off a fuel supply to engine cylinders when a rotational phase angle of a drive shaft of the fuel injection pump is coincident with a desired spill phase angle determined in accordance with engine operating conditions. The desired spill phase angle, i.e., the opening timing of the spill valve is controlled in accordance with the rotational variations of the fuel injection pump. The desired spill phase angle is divided by unit angle corresponding to a detection period of rotational angle signals produced in accordance with the rotation of the pump drive shaft, obtaining a quotient and a remainder angle. The remainder angle is converted into a time on the basis of an engine speed.

Abstract: A fuel injection control system for an internal combustion engine utilizes a fuel injection pump in which the pump cylinder is in fluid communication with the fuel injection nozzle and a piezoelectric actuated spill valve. A cam drive actuates the pump piston to achieve a constant velocity during the pumping cycle (constant velocity relative to degrees of rotation of the engine crankshaft). An index wheel connected to either the engine crankshaft or the pump camshaft is used in conjunction with an initial position detector, angular position detector and a pump control unit to close and open the spill valve at predetermine positions of the pump piston during the pumping cycle. The pump control unit includes a computer connected to various engine parameter transducers to adjust the closing and opening of the spill valve to achieve a desired fuel injection volume.

Abstract: A fuel injection pump is proposed for internal combustion engines having a control slide displaceable on the pump piston. The control slide cooperates with an oblique groove on a pump piston. The oblique groove is arranged to communicate via a conduit with a pump work chamber. The pump piston is rotatable and has a longitudinal groove of predetermined length on its jacket surface, which groove is adapted to communicate with the oblique groove and with its end remote from the pump work chamber determines the supply onset of the pump by plunging into the control slide.

Abstract: A plunger pump wherein the plunger is reciprocable in a barrel by a tappet which is coupled to the plunger by a pressure member. The tappet is reciprocable by a rotary cam in conjunction with a coil spring and is movable axially of the plunger by a first drive having a sleeve surrounding the barrel and having jaws in engagement with complementary jaws of the pressure member. Rotation of the pressure member in response to rotation of the sleeve entails axial movement of the tappet because the latter has threads in mesh with complementary threads of the pressure member whereby the tappet changes the length of forward and return strokes of the plunger. The latter has a control edge which can regulate the volume of outflowing liquid in response to rotation of the plunger on actuation of a second drive having a second rotary sleeve with jaws engaging complementary jaws of the plunger.

Abstract: An improved fuel injection system of the type in which the fuel injection timing and the fuel injection rate vary with the plunger pre-stroke which is regulated by displacing a control sleeve slidably fitted on a plunger reciprocating at a non-uniform speed and in which the actual injection quantity varies with the pre-stroke. The fuel injection system comprise an engine operating condition sensor, a pre-stroke control means, and a control sleeve driving means that cooperate to adjust the plunger pre-stroke. The amount of pre-stroke is detected by a position sensor. The position sensor and the engine operating condition sensor deliver respective outputs to a correction arithmetic means which computes the amount of deviation and thereby the amount of correction based on the outputs delivered.

Abstract: The fuel injection apparatus of the invention comprises a unit injector for injecting fuel to a combustion chamber of an internal combustion engine. An injection pump chamber and a timing chamber are defined in the unit injector, a quantity of fuel, adjusted in accordance with a drive condition of an engine, being supplied to these chambers. Fuel in the injection pump chamber and the timing chamber can be pressurized by an injection plunger and a timing plunger operated by pressure from the same pressure source. When the fuel in the injection pump chamber is pressurized to a predetermined injection pressure, fuel in the injection pump chamber is injected to the corresponding combustion chamber of the engine. The timing chamber is connected to a relief path, and a check valve, which can be opened at a pressure lower than the injection pressure, is provided in the relief path.

Abstract: A system for control of the amount of fuel to be injected in an internal combustion engine uses a high-pressure pump and a fuel control valve mechanism for spill having an electromagnetic valve and an oil-pressure valve. A predetermined delay time is added to the control timing of the current supply to the fuel control valve mechanism for spill, thus achieving the injection of the required amount of fuel at the most appropriate timing.

Abstract: A device is proposed for controlling the injection start to a set-point value dependent on operating parameters, in which the period of time between the appearance of an injection start signal and a reference marking (for instance, a top-dead-center signal) is counted out and the result of counting is compared with the set-point value. To avoid malfunctioning, the triggering of the counting process is possible in only one, predetermined crankshaft angle range. Various values are provided for the counting-out frequency. In the exemplary embodiment they are within the range between 50 and 200 kHz. In case of failure, a control of injection onset is effected, and as needed, a limitation of the fuel quantity as well--for instance to 70% of the respectively determined quantity.

Abstract: A fuel injection pump is proposed for internal combustion engines having a pump piston having a blind bore and two control bores and in which the fuel quantity to be supplied is controlled by means of a control slide having oblique control edges. At least two control edges are provided in a window-like recess of the control slide, of which the lower edge in each case and possibly the upper one as well extend obliquely; the upper control edge provided in the recess determines the supply onset, in cooperation with the first control bore, and the lower control edge of the recess determines the end of supply, in cooperation with the second control bore.

Abstract: An electrically controlled fuel injection pump is proposed, in which a portion of the discharger from the pump work chamber is varible by means of an electrically adjustable throttle.

Abstract: In a fuel injection system incorporating a distribution type fuel injection pump, wherein the amount of fuel in each fuel injection is controlled by the time duration from the stoppage to the resumption of the venting or spilling of the pumping chamber, the time duration is electronically calculated according to engine rotational speed and accelerator pedal opening amount as a rotational angle of the crankshaft.

Abstract: A fuel injection pump including an injected amount determining high pressure chamber for determining an injected amount of fuel and an injection timing determining high pressure chamber for determining an injection timing of fuel, with the high pressure chambers being provided independently of each other. A shuttle is disposed in at least the injected amount determining high pressure chamber to form an injection fuel chamber and a pressurization chamber. The injection timing determining high pressure chamber is disconnected from the pressurization chamber in the supply process of fuel for determining the injected amount and fuel for determining the injection timing, and the injection timing determining high pressure chamber is communicated with the pressurization chamber in the fuel injection process. The shuttle for determining the injection timing is not influenced by the fuel for determining the injected amount at the time when the fuel for determining the injected amount is supplied.

Abstract: Fuel injection apparatuses are used to inject fuel into the combustion chambers of compression ignition engines. The known mechanical drive arrangements for driving the distributor rotor and controlling beginning moment of fuel injection are complex, bulky and expensive to manufacture. The subject timing control for fuel injection apparatus includes a planetary gear arrangement driven by a pumping section and drivingly connected to a distributor rotor. A ring gear controls the timing phase relationship between the rotor and a delivery passage communicating the pumping section with the rotor. A riser of a flyweight assembly is mechanically connected to the ring gear so that the ring gear is positioned in accordance with the engine speed. The planetary gear arrangement is of simple construction requiring a minimum of space and is relatively inexpensive to manufacture.

Abstract: A digital control method for controlling a relative rotational phase angle p.theta. or the like in a fuel injection pump of an automobile. Decision is made of whether two successive deviations Er between the detected values and a target value are larger than a minimum reference deviation Ero or not. If they are larger than the Ero, decision is made of whether the signs of both the deviations are positive and/or negative. If both signs are positive, a given duration dTs is added to a fundamental duration ts of the next command signal for control. If both signs are different, a predetermined duration dTs is subtracted from the fundamental duration ts of the next command signal.

Abstract: Previously disclosed distributor fuel injection pumps for internal combustion engines offer the advantages of reduced size, weight, and cost of a fuel injection system. However, these pumps have not been able to provide relatively high fuel injection pressures which could improve fuel combustion for better fuel economy and lower noxious emissions. In contrast, the subject distributor fuel injection pump generates relatively high fuel injection pressures in a relatively compact arrangement. A semi-spherical nutator member freely rotatably mounted on an oblique journal of a drive shaft imparts high speed harmonic motion to at least one reciprocating pump plunger for pressurizing the fuel. A relatively large semi-spherical bearing interface between the nutator member and a pump housing accommodates very high pumping reaction loads.

Abstract: Fuel injection devices are used for injecting fuel into the combustion chambers of compression ignition engines. It is desirable to isolate the mechanical drive for fuel injection timing from the flow path of high pressure fuel to minimize the seepage of fuel into the fluid lubricating the mechanical drive while using only one speed responsive device for both the timing and governing functions. The subject fuel injection apparatus includes a planetary gear arrangement having a ring gear to change the timing phase relationship between a distributor rotor and a delivery passage which communicates the pump section with the rotor. A metering collar is adapted to meter the quantity of fuel delivered by the rotor to the outlet ports. Both the ring gear and the metering collar are mechanically connected to an element of a single flyweight assembly. The metering collar is widely spaced from the planetary gear arrangement to minimize the leakage of fuel into the lubricating fluid.

Abstract: A fuel injection timer for internal combustion engines, wherein a shaft of a fuel injection pump is rotated relative to a drive shaft connected to the internal combustion engine as a function of the rotational speed of the engine. Oscillating bodies are disposed between first tracks connected to the drive shaft and second tracks connected with a shaft of the fuel injection pump. The first and second tracks are disposed in opposed pairs and the oscillating bodies each transmit a portion of the pump drive torque and move from an inner end position at a lower rotational speed of the engine to an outer end position at a maximum rotational speed of the engine under the influence of centrifugal forces and counteracting spring forces. A slope formed by the tracks affects the relative torque between the two shafts with the displacement curve of the injection time which corresponds to a favorable combustion cycle.

Abstract: A timing advance variator for a fuel injection pump, the reciprocal movement of which is obtained by means of a transverse arm fixed to the drive shaft acting on the piston and in contact, by means of rollers, with a cam ring disposed in the pump casing, characterized by the fact that the cam ring is connected by a worm helical gear device the pin of which is constrained axially to the injection pump casing, which pin can be rotated by driving means for the movement of the cam ring.

Abstract: A distributor type fuel-injection pump according to the present invention is provided with a rotor which is rotated by an engine. The rotor has a pair of plungers slidable in the radial direction of the rotor, and a fuel pumping chamber is defined between the plungers. The rotor is surrounded by a cam ring which reciprocates the plungers as the rotor rotates, thereby sucking fuel into the fuel pumping chamber and pressurizing the fuel therein. The fuel pressurized in the fuel pumping chamber is distributed to individual cylinders of the engine. A plurality of spill holes are formed in the rotor, communicating with the fuel pumping chamber and opening to the outer peripheral surface of the rotor. A control sleeve to open and close the spill holes is axially slidably fitted on the rotor. First and second spill grooves capable of communicating with the spill holes are formed on the inner peripheral surface of the control sleeve.

Abstract: A spill port for discharging fuel is provided in a wall defining a high pressure chamber defined in a fuel injection pump, and capable of being successively communicated with respective cylinders. Opening and closing of this spill port is controlled by a solenoid valve. A fuel injection time period is calculated, pressure in a high pressure chamber is detected by a pressure sensor to obtain a fuel injection starting time, and the fuel injection time period thus calculated is added to the fuel injection starting time to obtain a fuel injection ending time. The solenoid valve is actuated to open the spill port at this fuel injection ending time, whereby the fuel in the high pressure chamber is discharged so that fuel injection is discontinued. The respective operations described above may be controlled by a microcomputer.

Abstract: A fuel injection apparatus in which the duration of fuel supply of at least two pump pistons of a fuel injection pump is determined by the closing duration of an electrically actuated overflow valve. The overflow conduits of at least two adjacent pump work chambers are interconnected, and the return flow of fuel from these overflow conduits to a chamber of lower pressure is controllable by the control element of the overflow valve which is common to these overflow conduits. The overflow conduits are each provided with one barrier valve, by means of which the at least one pump work chamber not under injection pressure at a given time can be blocked off from the pump work chamber which is placed under injection pressure at that time.

Abstract: A distribution type fuel injection pump for distributing and pumping a fuel into a plurality of cylinders of an internal combustion engine. The fuel injection pump is constructed of a hydraulic head formed with first and second fuel feed ports, a rotor fitted in the hydraulic head, and plungers fitted in the end portion of the rotor for effecting the pumping action in accordance with the rotations of the rotor. Separately of this rotor, there is formed in the hydraulic head, for example, a pressure space in which a shuttle is slidably fitted to partition the pressure chamber into first and second pressure chambers. The fuel, introduced from the first fuel feed port and compressed by the plungers, is guided into the first pressure chamber of said pressure space in accordance with the rotation of the rotor, and the fuel, is introduced into the second pressure chamber, is consecutively distributed and pumped into the respective engine chambers by the movements of the shuttle.

Abstract: A hydraulic injection-adjusting device for high pressure injection installations in auto-igniting internal combustion engines. Oil is supplied to operating chambers of the injection-adjusting device by means of a pressure supply pump with an electrically actuatable regulating valve being provided for controlling the flow of oil to inlet of the operating chambers. An electronic control unit is supplied on an input side which signals corresponding to current engine operating parameters with the control unit yielding on an output side thereof a desired value for the regulating valve to apply pressure in a controlled fashion to the injection-adjusting device. An arrangement is provided for measuring the actual value of the adjustment angle at the injection-adjusting device by constant answer-back line provides a feed of the actual value to the control unit.

Abstract: A fuel injection pumping apparatus comprises a rotary distributor member which is also axially slidable within a fixed sleeve. The distributor member is provided with a recess which communicates with a bore containing the pumping plungers. The recess is provided with mutually inclined leading and trailing edges which cover and uncover inlet ports and outlet ports as the member rotates. While an inlet port is in communication with the recess fuel is allowed to flow to the bore and when the inlet ports are covered and outlet port is uncovered to the recess fuel flows from the bore to the uncovered outlet port. The fuel quantity is varied by altering the axial position of the distributor member.

Abstract: A fuel injection system has a fuel supply line which extends from a fuel reservoir to a fuel injector through a booster and is hydraulically isolated from a hydraulic circuit for operating the booster and a hydraulic circuit for operating a nozzle needle actuator, which is operatively associated with the fuel injector to control fuel injection. The two hydraulic circuits share a common source of hydraulic fluid supply which is independent of the fuel reservoir and adapted to actuate general hydraulic units. An electronically operated pressure control valve is controlled by a control unit to drive the booster with a hydraulic fluid pressure which varies in proportion to a varying engine load, i.e. full load, partial load and no load.

Abstract: In a fuel injection pump having a dual plunger composed of a first plunger for adjusting the timing of the beginning of fuel injection and a second plunger for adjusting the timing of the end of fuel injection, the first and second plungers are operatively connected with a governor in such a way that only the first adjusting member is operated in accordance with the governor and the second plunger is displaced in accordance with the displacement of the first plunger, whereby the second plunger is displaced by the distance necessary for compensating for the change in the amount of fuel injection caused by the displacement.FUEL INJECTION PUMP The present invention relates to a fuel injection pump for an internal combustion engine in which the timing of the beginning of fuel injection can be set independently of the setting of the timing of the end of fuel injection.Recent circumstances such as the increase in the cost of fuel has led to the frequent use of lower quality fuels in marine engines.

Abstract: A fuel injecting device has a fuel pump and a fuel injector.

Abstract: The reciprocating plunger reciprocable in the pump cylinder of a distributor type diesel fuel injection pump is helically splined to an index ratchet gear that is also operatively associated with a pawl detent whereby the index ratchet gear is rotatable in only one direction. The plunger has a discharge slot on its outer peripheral surface which registers with one of the plural discharge ports opening from the pump cylinder and the plunger controls the covering and uncovering of a fuel inlet port to the pump cylinder. Upon a pump stroke of the plunger, the index ratchet gear is rotated so that the next adjacent tooth is brought into alignment with the pawl detent to then prevent its rotation in the opposite direction during the suction stroke of the plunger.With the index ratchet gear thus fixed, the plunger is thus rotated on the suction stroke so as to align the discharge slot with the next adjacent discharge port.

Abstract: This device comprises a body provided with a bore in which a plunger is slidably mounted, this plunger is movable between a lower position in which it obturates injection nozzles provided through the bottom of the bore, and an upper position where it is spaced from the bottom. Metering means comprise a feed groove provided in the piston wall and opening on the tapered end thereof, this groove having an upper edge inclined to the piston axis. This upper edge co-operates with a fuel inlet port. A similar groove is provided in the piston wall, this groove having an inclined upper edge co-operating with a fuel discharge port. Fuel metering is achieved by rotation of the plunger about its axis.

Abstract: The invention relates to a fuel injection system having a pump/nozzle for which the fuel is metered by one apparatus and the injection onset is determined by a second apparatus. In accordance with the invention, these apparatuses each operate with a distributor, both distributors being combined into a single structural unit. Because of this combination, structural possibilities are created which, both functionally and in terms of manufacturing cost, represent substantial improvements in the field of injection systems.

Abstract: A method and a system are disclosed for controlling the amount and advance of fuel injection of a diesel engine using an injection pump of the type which defines the fuel supply period and the compression period, alternately, in synchronism with explosion-exhaustion and intake-compression strokes of each cylinder of the engine, and includes first and second pressure chambers to be supplied with fuel through first and second electromagnetic valves, respectively, during the fuel supply period, and the fuel in the amount equivalent to the fuel amount supplied to said second pressure chamber being injected into the cylinder at an injection timing determined from the total amount of the fuel supplied to said first and second pressure chambers. The open time intervals of the first and second electromagnetic valves are determined from the fuel amount to be injected into each cylinder and the injection timing advance which are determined in accordance with the engine operating conditions.

Abstract: To provide for extremely rapid operating conditions of the valve in an electrically controlled fuel injection system, that is, valve operation in the order of 10.sup.

Abstract: A fuel injection apparatus for internal combustion engines, which includes a servo piston having a large size portion and a small size portion. The large size portion defines a servo-pressure chamber and a counter-servo-pressure chamber, and the small size portion a pump working chamber, respectively. Operating fluid is supplied from an exclusive pressure feed means to the servo-pressure chamber and the counter-servo-pressure chamber alternately through the action of a solenoid controlled selector valve, while fuel is supplied to the pump working chamber from another pressure feed means provided separately from the firstmentioned pressure feed means. The large size portion of the servo piston has its outer peripheral surface formed with an oblique-base notch opening in its end face facing the servo-pressure chamber. The piston housing has its peripheral wall formed with a spill port which is located for engagement with the oblique-base notch.

Abstract: A rotary magnet control element for a distributor injection pump is proposed, which is universally movable by an adjustment means while an engine in running for adjustment of the position of the rotary magnet relative to an annular slide which is reciprocably disposed on a pump piston.

Abstract: A fuel injection pump of the rotary distributor type having opposed fuel pumping pistons housed within a rotor and actuated by an internal ring cam. Fuel distribution, metering and timing control are effected through ports and slots associated with the rotor, the pump housing and a spill sleeve. The angular position of the cam is varied automatically in accordance with changes in engine speed as are the relative positions of certain ones of said ports and slots to provide an automatic advance of the fuel injection timing. The pump is particularly suited for electronic governing, electronic timing control and electronic control of rate of injection.

Abstract: A injection advance device is disclosed for diesel engine fuel injection pump including a pump housing, a feed pump for supplying fuel pressure proportional to engine speed into the pump chamber, and a control member movable to determine a fuel-injection timing corresponding to its position. The injection advance device comprises a casing, a cylinder reciprocally located in the casing, a piston reciprocally located in the cylinder and drivingly connected to the control member, and means for allowing movement of the piston in a direction causing the control member to advance the fuel-injection timing. Means is provided for moving the cylinder in a direction holding the piston in the position before the engine is warmed up.

Abstract: In fuel injectors of the type which include a rotating plunger (12) having a double helix, or "double scroll", control edges (62, 64), a control edge configuration is disclosed which improves the starting characteristics of certain internal combustion engines. A starting groove (76) and a starting projection (78) are provided in the control edges (62, 64) which simultaneously greatly increase the amount of fuel injected into the combustion space and retard engine timing. Also provided is a control mechanism (92-96) which prevents the injectors from accidently or intentionally rotating to the start position when the engine is running.

Abstract: A unit fuel injector assembly consisting of a plunger type pump surrounded by a solenoid actuator, the voltage to which is controlled to vary the duration and magnitude of fuel pumped, thereby controlling the plunger stroke, a position feedback device providing a correction to the fuel flow to match actual flow with scheduled flow.

Abstract: An injection timing control system for a fuel-injection pump for an engine has a phase angle regulator for varying the rotational phase angle of a drive shaft of the fuel-injection pump in which a cylindrical extension of one of an input shaft adapted to be driven by the engine and an output shaft for driving the drive shaft of the pump surrounds an end portion of the other shaft in spaced apart relationship. A male spline is formed on the end portion over some axial length thereof while a female spline is formed on the extension over some axial length thereof, at least one of the splines being a helical spline. A slider is located in an annular space between the splines and formed with splines meshing therewith respectively. An annular cylinder is formed between the substantial parts of the rest axial length portions of the extension and end portion, and a piston is reciprocally received in the cylinder, the slider and piston being formed as a unit.

Abstract: A fuel injection pump for a compression-ignition engine includes a cylinder having a bore therein and a pump piston which is mounted not only to reciprocate within the bore past a fuel supply port but also rotate therewithin. The pump piston has upper and lower control surfaces which each have a bowed shape. The center or centers of the control edges lies or lie above them, and in the region between the upper part loads and full load in the direction towards full load the upper control edge has a rising shape while the lower control edge has a falling shape. The lower control edge, by comparison with the remainder of its extent falls progressively less steeply towards full load and the upper control edge rises increasingly steeply, so that the compensation of delivery in accordance with speed is achieved predominantly by the upper control edge and there is obtained a speed-dependent advance of the start of delivery.

Abstract: A fuel injection pump for Diesel engines in which a rotating and reciprocating piston pressurizes and distributes fuel to individual pressure lines leading to the injection valves of the engine. In order to change the timing of injection with respect to the engine cycle, there is provided a mechanism to change the relative angle between the pressurizing piston and its drive means, which runs in synchronism with the engine. The mechanism operates hydraulically and is affected by the fuel pressure in the sump of the injection pump. There is also provided a hydraulic control valve mechanism which permits varying amounts of fuel to flow back from the sump to the low pressure side of the fuel delivery pump, thereby changing the injection timing. A primary control valve adjusts the sump pressure on the basis of engine speed while a secondary control valve adjusts the sump pressure on the basis of engine temperature in order to adapt the timing of fuel injection to engine starting and engine warm-up.

Abstract: This disclosure deals with a mechanism for adjusting the timing of initiation of injection by a fuel injector of an internal combustion engine. The mechanism includes a piston connected to be moved by a drive for the injector, and another piston which is connected to move the plunger of the injector. A timing fluid supply is provided for feeding a timing fluid into a timing chamber formed between the two pistons under selected operating conditions, the timing fluid forming a hydraulic link between the two pistons. The mechanism further includes pressure relief means for releasing a portion of the timing fluid after the termination of injection, the relief means comprising a pressure responsive mechanism.

Abstract: A separate valve, rotatable with a pump control valve in a multiple plunger type fuel injection pump used to sequentially supply fuel to a number of fuel injection nozzles, is actuated by a solenoid to control fuel spill from each plunger whereby to control quantity and timing of injection.

Abstract: A fuel injector (10) is provided for each cylinder of an internal combustion engine, the injector including an electronically operated control valve (146) disposed between supply passage (42) and a timing chamber (98) to control the admission of fuel into and out of the timing chamber. A primary pumping plunger (62) and a secondary plunger (90) are axially spaced within the central bore of the injection body, and a normally closed injection nozzle (14) is situated at one end of the injector body. A mechanical linkage (27, 28, 30) associated with the camshaft of the engine drives the primary pumping plunger (62) against the bias of a main spring (18). The timing chamber (98) is defined between the plungers (62, 90) and a metering chamber (128) is defined between the secondary plunger (90) and the nozzle (14).