Abstract: An advance arrangement for a fuel injection pump, comprising a housing slidably receiving an advance piston which, in use, cooperates with the fuel injection pump to adjust the timing of fuel delivery by the pump, and, a light load piston associated with the advance piston, the housing supporting an externally accessible, adjustable abutment which cooperates with the light load piston to permit setting of a rest position of the light load piston relative to said housing and thereby to permit adjustment, from the exterior of said housing, of the datum setting from which the advance arrangement adjusts fuel injection timing.

Abstract: The present invention relates to hydraulic systems including hydraulically actuated fuel injectors that have a pilot operated spool valve assembly. One class of hydraulically actuated fuel injectors includes a solenoid driven pilot valve that controls the initiation of the injection event. However, during cold start conditions, hydraulic fluid, typically engine lubricating oil, is particularly viscous and is often difficult to displace through the relatively small drain path that is defined past the pilot valve member. Because the spool valve typically responds slower than expected during cold start due to the difficulty in displacing the relatively viscous oil, accurate start of injection timing can be difficult to achieve. There also exists a greater difficulty in reaching the higher end of the cold operating speed range. Therefore, the present invention utilizes a fluid evacuation valve to aid in displacement of the relatively viscous oil during cold start conditions.

Abstract: A valve assembly adapted for an internal combustion engine, including a valve housing having a pressure chamber. A piston seperates the pressure chamber into a first subchamber and a second subchamber. A first port is coupled the first subchamber and a second port is coupled to the second subchamber. A valve is coupled to the piston and moveable between an open position and a closed position. The valve is moved from the closed position to the open position by supplying a high pressure working fluid to the first port and coupling the second port to a drain. The valve is moved from the open position to the closed position by supplying the high pressure working fluid to the second port and coupling the first port to the drain.

Abstract: There is provided a hydraulic fuel system having an integrated and internally mounted oil circuit for providing high pressure in a hydraulically operated electronically controlled fuel injector fuel system. There is provide an internally mounted high pressure pump in a pump housing in the crankcase and connected to internally routed high pressure lines that deliver the oil to high pressure oil rails. There is provide an integrated low pressure oil reservoir in the crank case that comprises a low pressure oil cooler and reservoir. The oil cooler is preferably immersed inside the low pressure oil reservoir to optimize available engine space and improve heat transfer. There is also provided a high pressure pump filter that covers a high pressure pump inlet feed passage to prevent debris from passing into the high pressure oil pump and other components on the high pressure oil circuit.

Abstract: The regulating member according to the present invention is arranged in a pressure line in a fuel injector with a pressure intensifier and has an actuator, a valve chamber and a spring-loaded valve piston arranged moveably in the valve chamber. The valve piston, in its position of rest, makes a flow connection through the valve chamber between a pressure supply and a control space of the pressure intensifier and, in its switching position, the valve piston makes a flow connection through the valve chamber in which the control space in the pressure intensifier is relieved of pressure.

Abstract: This invention relates to a procedure for analyzing and influencing the driveability of motor vehicles, including the following steps: Conducting tests on a real vehicle to obtain measurement variables describing its driveability; Continuous monitoring to check whether at least one of a number of predefined trigger conditions is fulfilled, i.e., whether a certain set of variables takes on certain values; If the trigger condition is fulfilled, computation of a profile of several ratings representing vehicle driveability from one or more measured values, using predefined functional relationships.

Abstract: With reference to the drawings and in operation, the present invention is adapted to provide a method and apparatus for dynamically controlling the injection timing of a fuel injector connected to a fuel system located within an engine. The method includes the steps of establishing a desired injection timing of the injector 104 and determining an fuel injection command delivery time in response to the desired injection timing, and responsively delivering the fuel injection command. The actual injection timing is determined, and then the injection command delivery time is modified in response to comparing the actual and the desired injection timing. Comparing the actual and desired injection timing provides for closed loop control of the injection timing of the fuel system 102.

Abstract: A method for calibrating the injection time (&agr;) of a first fuel (6′) in a diesel engine (2). The method comprises the steps of feeding adjustment fluid (6) under pressure to an injection adjuster (3) which comprises an adjuster plunger (4). The diesel engine (2) is made to run at a constant speed (r). The adjuster plunger (4), which is coupled to a roller-bearing ring (15) for adjusting the injection time (&agr;) is adjusted with the aid of the pressure of the adjustment fluid (6). The fuel consumption of the diesel engine (2) is measured and the injection time (&agr;), when the fuel consumption converts from varying to being constant and/or vice versa, is recorded.

Abstract: A governor comprising a metering valve member slidable within a bore to control the degree by which an outlet is obscured, the valve member and bore together defining first and second chambers. The governor also comprises a restricted flow passage whereby fuel can flow from the first chamber to the second chamber at a restricted rate, and a control valve controlling communication between the second chamber and a low pressure reservoir. The control valve is adjustable by means of a centrifugal weight mechanism.

Abstract: An advance arrangement comprising an advance piston slidable within a bore under the action of fuel pressure within a control chamber, a surface associated with the piston being exposed to the fuel pressure within the control chamber. The control chamber communicates, through a restricted flow passage, with a low pressure fuel volume. A valve is operable to vary the restriction to flow formed by the restricted flow passage.

Abstract: In an electronic fuel injection apparatus which controls a fuel injection timing of a fuel injection pump for a diesel engine through a timing control valve, when the time during which a present final feedback correction quantity obtained by adding, to the last final feedback correction quantity, the present feedback correction quantity which is computed according to a difference between an actual fuel injection timing and a target fuel injection timing, reaches a lower limit or an upper limit and also the difference is outside a predetermined range, lasts for a predetermined time, controlling a timing control valve is stopped.

Abstract: An advance arrangement is described including an advance piston slidable within a bore and defining, with the bore, a control chamber. A restricted passage permits fluid to escape from the control chamber at a controlled rate. A pump supplies fluid to the control chamber, the rate at which fluid is supplied to the control chamber relative to that at which the fluid can escape controlling the position of the advance piston. The pump is independent of a feed pump used to supply fuel to the high pressure pump with which the advance arrangement is used.

Abstract: An engine fuel supply apparatus is provided with an accident judging device for effecting accident judgement in a fuel control system under the conditions that the fuel pressure regulator driver is subjected to feedback control of the fuel pressure, and that there is a change in the fuel pressure and the change continues for a predetermined time of period within a set time range.

Abstract: A fuel injection pump, with an injection adjusting piston that serves to adjust the onset of injection, in which due to an off-center coupling to a cam part of the cam drive of a fuel injection pump embodied as a distributing injection pump, the injection adjusting piston is subjected to tilting moments during operation. In addition, the injection adjusting piston is subjected to other forces by means of a radially produced pressure fluid supply on a side of the injection adjusting piston disposed essentially opposite the coupling, and these other forces, together with the tilting moment forces, produce high, one-sided pressure loads in the radial direction on the injection adjusting piston. By producing a second pressure field, the injection adjusting piston undergoes a compensation of the above-mentioned forces acting on the injection adjusting piston and consequently experiences a significantly reduced radial load.

Abstract: A fuel injection pump for adjusting the injection onset by an injection adjuster piston. The piston is embodied as a follower piston of a control slide disposed in the piston on one side the piston encloses a work chamber and is acted upon by the pressure in this work chamber counter to the force of a restoring spring, and is connected to a substantially stationary part of a cam drive of the fuel injection pump. To avoid feedback of pressure surges on the control slide and its adjustment, the inlet cross section of the connecting line is embodied as an elongated cross section extending in the displacement direction of the control slide. A more problem-free adjustment of the control slide is thus obtained, and hence also a more-precise, vibration-free adjustment of the injection adjuster piston and of the injection onset is obtained.

Abstract: An advance arrangement comprises an advance piston slidable within a bore, the advance piston cooperating, in use, with a cam arrangement of a fuel pump to adjust the timing of fuel delivery by the pump, a servo-piston slidable in a bore provided in the advance piston, a light load piston moveable relative to the advance piston against the action of a light load control spring, a servo control spring engaged between the light load piston and the servo-piston, a light load control valve operable to control the application of fuel to the light load piston to adjust timing under light load conditions, and an independent temperature control valve operable to control the application of fuel to the light load piston depending upon the engine temperature to permit adjustment of the timing of fuel delivery to compensate for cold conditions.

Abstract: A method and a device for controlling a control element, particularly an injection-timing device of a high-pressure fuel pump, in an open loop. A control unit presets a driving value to be applied to the control element. The driving value and a neutral value are applied alternately to the control element.

Abstract: A fuel injection timing control system for a diesel fuel injection pump with a duty-cycle controlled electromagnetic solenoid valve associated with an injection-timing-control timer piston to change a timer-piston axial position or a set position of a pump plunger in response to a duty cycle of the electromagnetic solenoid valve, comprises a control unit for transiently permitting the entry of a duty cycle of the electromagnetic solenoid valve into a predetermined dead-zone for a predetermined period of time during a fuel injection timing closed-loop control in which an actual injection timing is feed-back controlled toward a target injection timing. In addition, the control unit limits the duty cycle of the electromagnetic solenoid valve to a predetermined limiting value as soon as the predetermined time period has been elapsed, during the fuel injection timing closed-loop control.

Abstract: A method and a device for the closed-loop control of a control element having integral action, particularly an injection-timing device of a high-pressure fuel pump. Using a system deviation as a baseline, a controller preselects a driving signal to be applied to the control element. In the event of an error in the area of actual-value ascertanment, an emergency travel operation is initiated. A signal is applied to the control element, such that at least short-term, it assumes a defined position.

Abstract: A process and device for triggering an actuator are described, in particular an actuator triggered in cycles for an internal combustion engine. The triggering signal frequency can be changed to prevent resonance effects. The triggering signal frequency is varied between a first and a second limit value over time according to a preselected function.

Abstract: A method and a device for controlling in closed-loop a final controlling element having integral action, in particular an injection-timing device of a high-pressure fuel pump. On the basis of a system deviation, an automatic controller defines a driving signal to be fed to the final controlling element. The output signal from the automatic controller is acted upon by a precontrol, which can be so specified that the final controlling element remains in its position.

Abstract: In a timer device having a timer sleeve at a housing with a timer piston slidably provided at the timer sleeve, a high pressure chamber is constituted by securing to the housing a high pressure side cover member constituted as an integrated part of the timer sleeve. The high pressure chamber and a passage at the housing communicating with a chamber are connected to each other by a passage formed in high pressure side cover member. A check valve for absorbing shock waves generated within the high pressure chamber is provided in the passage in the high pressure side cover member. The passage can be designed and manufactured with ease, and at the same time, the timer piston and the check valve can be separately designed and manufactured. Furthermore, stable operation of the check valve is achieved.

Abstract: A system is for a diesel engine for detecting malfunctioning of an injection timing control apparatus. The apparatus controls an injection timing of fuel, pressurized by a pump, to be injected from injection nozzles. An electronic control unit (ECU) computes a target injection timing based on the running condition. The ECU controls the injection timing to set the actual injection timing to the target injection timing. The ECU computes a difference between the actual injection timing and the target injection timing. The ECU determines whether the injection timing control apparatus is malfunctioning when the difference between the actual timing and the target timing is greater than a predetermined value. The determination by the ECU is altered in accordance with the running condition of the engine.

Abstract: An advance mechanism for a pump comprises a fluid operable piston arranged to have pressurized fluid applied to a first end thereof to adjust the axial position of the piston. The arrangement further comprises means for applying fluid under pressure to a part of the piston remote from the first end thereof in order to apply a torque to the piston. In one embodiment, the means for applying comprises a passage extending within the piston, the passage communicating with the first end of the piston such that high pressure fluid is received by the passage.

Abstract: A fuel injection pump includes an injection onset adjustment piston in a cylinder bore that adjusts injection. The onset adjustment piston is embodied as a following piston which includes therein a control slide valve. The onset adjustment piston encloses a work chamber on one end, and is acted upon by the pressure in the work chamber counter to the force of a restoring spring. The onset adjustment piston is connected to an essentially stationary part of a cam drive of the fuel injection pump. In order to prevent feedback from the work chamber via the control slide valve and its adjustment, the control slide valve is effectively damped by means of a separate pin on an end of the control slide valve which extends into a blind bore of the onset adjustment piston.

Abstract: A target fuel injection timing of the fuel injection pump is calculated based on the operating conditions of a diesel engine (Steps 102; 302; 602), while an actual fuel injection timing is calculated based on crank angle signals (Steps 103; 303: 603). Then, a fuel injection timing error (Terr) is obtained based on a difference between the target fuel injection timing and the actual fuel injection timing (Steps 104; 304; 604). To adjust the actual fuel injection timing based on the error (Terr), a rotational position of a roller ring (10) is controlled through a timer piston (21) slidable and housed in a timer device (28) by a hydraulic pressure control valve (27) in response to a pulse actuating signal having a controllable duty ratio (DFIN).

Abstract: A cam follower lever assembly is provided which permits variable control of the timing of the beginning of operation of an engine component, i.e. fuel injector or engine valve. The cam follower lever includes a timing control lever and a force transmitting lever mounted for pivotal movement on a common pivot shaft. The timing control lever is also mounted for nonpivotal movement, relative to the pivot shaft, by a hydraulic actuation device permitting selective nonpivotal movement of the timing control lever relative to a cam's outer surface so as to selectively advance or retard the timing of, for example, fuel injection. The actuation device includes actuator cavities formed in the levers and a control valve arrangement. In one embodiment, a control valve is mounted in a cavity formed in the timing control lever.

Abstract: An injection timing control device for a fuel injection pump includes an oil-pressure control valve for controllably changing the fuel injection timing of the fuel injection pump. The oil-pressure control valve includes a valve cylinder having a valve seat. The valve seat has a first truncated-conical surface. The oil-pressure control valve further includes a valve needle slidably received in the valve cylinder and movable by a control unit. The valve needle has a second truncated-conical surface for engaging with the first truncated-conical surface to close the oil-pressure control valve and disengaging from the first truncated-conical surface to open the oil-pressure control valve. The first and second truncated-conical surfaces, when engaged, form a circular seal line on which the first and second truncated-conical surfaces abut each other. The circular seal line has a diameter which is substantially the same as a diameter of the valve needle.

Abstract: An injection timing control device for a fuel injection pump includes a timer cylinder and a timer piston slidably received in the timer cylinder to define a high-pressure chamber and a low-pressure chamber at opposite axial ends thereof. The high-pressure chamber communicates with a high pressure side, while the low-pressure chamber communicates with a low pressure side and is provided therein with a spring for biasing the timer piston toward the high-pressure chamber. A servo valve having a spool is further provided. Communication between the high-pressure and low-pressure chambers is allowed or prohibited depending on movement of the spool of the servo valve. When the communication is allowed, a fuel pressure in the high-pressure chamber is released into the low-pressure chamber so that the timer piston moves toward the high-pressure chamber due to a biasing force of the spring. This movement of the timer piston is transmitted to a roller ring to retard a fuel injection timing.

Abstract: A servo valve type timer for controlling a fuel injection timing on the basis of the difference in pressure between a high-pressure chamber and a low-pressure chamber, including a timer piston for adjustment of a fuel injection timing which is disposed between the high-pressure chamber and the low-pressure chamber so as to be slidable between the high-pressure chamber and the low-pressure chamber and is operated in accordance with a fuel pressure introduced into the high-pressure chamber and/or the low-pressure chamber, a servo valve for controlling the operation of the timer piston, and a pressure control member for adjusting the fuel pressure of the low-pressure chamber.

Abstract: Fuel injection is prevented until an injection timing of a fuel injection device detected during cranking of a diesel engine, is identical to a target injection timing. Preferably, the fuel injection timing is advanced during the prevention period according to fuel properties. In this way, startup time is shortened, and toxic components contained in exhaust gas are reduced during startup.

Abstract: A mounting for an advance piston comprises a sleeve having flanges arranged to extend outwardly and arranged to engage a pump housing in order to secure the sleeve thereto, the sleeve extending within a passage provided in the pump housing. One or more of the flanges may be securable to the sleeve for example, by screw threaded engagement, or by means of bolts.

Abstract: In an injection timer for a fuel injection system in which control of the timer shifts from feedback control to open loop control when the engine rotation rate is equal to or less than a specific rotation rate, a decision is made as to whether or not the operation is at startup time and, if it is, decision making for the engine rotation rate is canceled and feedback control is maintained even if the engine rotation rate is equal to or less than the specific rotation rate. Because of this, in a fuel injection system which is capable of maintaining the pump chamber pressure at a high level even at low engine rotation rates, the injection timing device can achieve both an improvement in accuracy of injection timing control and anti-pollution measures at startup.

Abstract: A fuel injection timing control device includes a lift sensor for detecting a lift amount of a needle valve of a fuel injection nozzle, rectangular wave conversion means for converting an output signal of the lift sensor to a rectangular wave with a predetermined threshold level, and ignition point calculating means for calculating a timing for actual fuel ignition on the basis of the converted rectangular wave in accordance with a driving condition of the internal combustion engine, wherein the fuel injection control is performed on the basis of the calculated ignition timing.

Abstract: A fuel pumping apparatus of the rotary distributor type has a pumping plunger (14) mounted in a bore (13) in the distributor member and a cam ring (24) operable to move the plunger inwardly in timed relationship with the associated engine. The cam ring is positioned by a fluid pressure operable piston (25) contained within a cylinder (26). The apparatus includes a further piston (31) mounted in a further cylinder connected to the first mentioned cylinder, the further piston being biased by a pre-stressed spring (32). A stop is provided to limit the movement of the further piston against the action of the spring which yields to limit the fuel pressure developed by the plunger during the initial inward movement.

Abstract: An infinitely variable hydromechanical timing valve, for a fuel supply system for an internal combustion engine, is provided with a housing having a valve seat therein, and a timing control plunger mounted for reciprocation within the housing toward and away from the valve seat. A first side of the timing control plunger is acted upon by a pressure which varies as a function of engine load while a second side of the timing control plunger is acted upon by a pressure which varies as a function of engine speed. Furthermore, the timing control plunger has an orificed flow passage therethrough, one end of which is in communication with a timing flow of fuel from the pump and an opposite end of which timing flow passage communicates with a timing fluid supply rail.

Abstract: A control device for varying the supply onset of a fuel injection pump, in which the supply rate at the lower full-load point is increased without overloading the pump at the rated capacity point. A control of this kind is effected by the use of a deflection piston as well as by use of a prestressed check valve. Regulation serving the same purpose can be achieved with the aid of an element pressure sensor and two magnet valves. The control device is intended for use in an internal combustion engine.

Abstract: A fuel injection pump in which the injection onset is varied by means of an injection adjuster, which has a two part adjusting piston acted upon by a hydraulic control pressure, which piston is adjustable counter to a restoring spring and by means of a bolt, engages the cam drive of the fuel injection pump in order to adjust the injection onset. To reduce the highest pressure in the high-pressure chamber of the fuel injection pump and to form the course of injection pressure, the adjusting piston is embodied in two parts, with a first piston that is adjustable relative to the second piston counter to a compression spring and the second piston is connected with the bolt. This makes possible a deflection motion of the piston relative to the second piston and a reduction in the pump piston stroke speed.

Abstract: A viscosity sensitive, pressure divider arrangement for use as part of an engine timing control tappet system where that system includes a block oil pressure supply, hydromechanical control valve and an oil sump, the pressure divider arrangement including an inlet chamber, a divider chamber and an exit chamber. The inlet chamber is connected to the divider chamber by means of a first connecting conduit having a relatively short length. The outlet side of the divider chamber is connected with the exit chamber by means of a second connecting conduit which has a length substantially longer than the length of the first connecting conduit. Additionally, the divider chamber includes a pressure-assist outlet aperture which is in flow communication with the hydromechanical control valve. The viscosity of oil flowing into the pressure divider arrangement will be acted upon by the combination of connecting conduits wherein the first connecting conduit is less viscosity sensitive than is the second connecting conduit.

Abstract: A cam ring for a cam drive of a distributor radial piston injection pump. Said cam ring includes on the outside a connecting member which is formed in one piece that is particularly roller-shaped with an axis parallel to the axis of the cam ring and that engages a recess of an adjusting member that serves in the adjustment of the cam ring. This results in an embodiment of the cam drive that can be advantageously assembled and has a well-designed cam ring with a very low incidence of failure with regard to durability, production and assembly.

Abstract: A variable displacement high pressure pump having a plurality of high pressure pumping units which receive fuel from a low pressure fuel pump. A rotary cam-driven roller tappet, for producing pumping displacement of the pumping plunger of a respective pumping element, is connected to the pumping plunger by a separated link in a manner permitting the pumping plunger to float relative to the roller tappet during at least a portion of each pumping cycle. As a result, the capacity of the pumping chamber can be limited to an extent that is less than the full stroke achievable by the pumping plunger being retracted to the maximum extent which is permitted by the driving cam.

Abstract: A fuel-injection device includes a solenoid valve which adjusts a fuel-injection level of a fuel-injection pump by adjusting its throttling for the fuel-injection passage to supply the fuel to a compressor. A driving pulse to drive the solenoid valve is formed taking various factors into consideration. For example, the driving pulse is composed of a segment having a large duty ratio and a segment having a small duty ratio in order to secure a responsiveness of the solenoid valve. The driving pulse is formed on the basis of a change in electrical voltage to drive the solenoid valve, varying levels of voltage drop in a wiring harness installed for every cylinder, and of varying levels of responsiveness unique with fuel-injection pumps.

Abstract: A hydraulic tappet for use in the fuel injector drive trains of compression ignition or diesel internal combustion engines are provided which optimize injector timing for improved fuel economy. One embodiment of the hydraulic tappet of the present invention includes a dampened pressure regulating feature which determines blow down pressure. A second embodiment of the hydraulic tappet of the present invention includes a dampening load cell feature which allows the blow down pressure of the load cell to be increased and injection timing to be optimally advanced.

Abstract: A fuel pumping apparatus for supplying fuel to an internal combustion engine includes a first fluid pressure operable piston movable against the action of a spring to advance the timing of fuel delivery by the apparatus. The spring bears at its end remote from the piston against a spring abutment which is in the form of a further piston. The position of the further piston is controlled by a temperature responsive device and when the engine is hot the further piston is advanced from a first position to a second position. A first stop limits the movement of the first piston under increasing fluid pressure when the further piston is in its first position and is secured to the housing and a second stop limits the movement of the first piston under increasing fluid pressure when the further piston is in its second position the second stop being carried on the further piston.

Abstract: A fuel injection pump has an inner chamber, a drive shaft extending into the inner chamber, a front cam plate setting a pump plunger into a reciprocating and rotating movement, a front face coupling which couples the drive shaft with the front cam plate, a roller ring provided with a plurality of rollers for supporting the cam plate, a rotational angle sensor including a stationary part and a sensor wheel formed as a movable part and arranged on the drive shaft radially opposite to the stationary part, a pivotable support ring having a part which axially overlaps the sensor wheel and carries the stationary part and a coupling part which couples the support ring with the roller ring and engages in a recess of the roller ring.

Abstract: Fuel injection device for spark-ignition internal combustion engines having a pump and a distributor with a reversing valve, which distributor is preferably driven at pump speed and has a stationary and a rotating part. The reversing valve is arranged inside the rotating part of the distributor, preferably concentrically, and its inlet opening is connected with the pump work space via a line which likewise extends exclusively inside the rotating part of the distributor.

Abstract: A fuel injection pump for internal combustion engines has an adjusting piston for adjusting an injection instant, is acted upon by a return force and delimits a working space, a control slide delimiting a pressure space in the adjusting piston and displaceable in the adjusting piston counter to a return force by a pressure-source supply pressure in the pressure space and controlled as a function of speed of the engine so that the working space can be connected to a pressure source or to a relief space, and so the supply pressure in the pressure space is additionally controlled as a function of further operating parameters of the engine. A feed pump delivering at a rate proportional to speed has a delivery side connected to the pressure space, a pressure line, containing a restriction, directly connects the delivery side of the feed pump to the pressure space so that the pressure is directly connected with the feed pump exclusively by the pressure line and is not connected with the inlet chamber.

Abstract: A distributor-type fuel injection pump is provided with a hydraulic injection adjusting mechanism whose injection adjusting piston adjusts the cam gear unit for driving the pump plunger to execute strokes corresponding to the desired position of the start of injection. The injection adjusting piston defines a control space on one side and a spring space receiving a return spring on the other side. The control space is connected via a throttle bore with the pump interior space which is filled with fuel by a delivery pump. The fuel pressure is adjusted by a pressure control valve. To prevent unstable pressure vibrations on the injection adjusting piston, which leads to defects in the operation of the fuel injection pump, the spring space is connected on one side with the suction side of the delivery pump via a first throttle and on the other side with the pressure side of the delivery pump via a second throttle having a smaller throttle cross section.

Abstract: A fuel pumping apparatus has a fixed body in which is defined bores containing pumping plungers. The plungers are moved inwardly by cam lobes on a rotatable cam ring to displace fuel to an associated engine. The cam ring is provided with an annular extension within which is located a drive shaft. The drive shaft is coupled to the extension of the cam ring by means of a tongue and slot connection. The tongue is carried on a push member mounted in the drive shaft and movable by means of a piston and the tongue and slot are arranged so that as the piston moves, relative angular movement will take place between the drive shaft and cam ring.

Abstract: It is possible in a simple manner, especially in distributor injection pumps, to attain quiet combustion in the idling range of a Diesel engine, without modifying the basic construction of the fuel injection pump by shifting the injection pumping to the last portion of the stroke of the cam driving the pump piston of the fuel injection pump for idling, by means of an injection onset adjusting device, in combination with a determination of injection duration via the closing phase of an electrically controlled valve that relieves the pump work chamber.