Abstract: A fuel injection apparatus (FIG. 1) for internal combustion engines is proposed, in which the onset and end of injection are determined by means of a hydraulically actuated control slide. The injection pumps of the apparatus, preferably combined with an injection nozzle to make a pump/nozzle unit, have a central control fuel source represented by a supply pump and a first pressure limitation valve, which generates a control pressure (p.sub.S) actuating the control slide which is several times greater than the supply pressure (p.sub.V) determined by a second pressure limitation valve. In order to initiate the onset of injection, the control slide is placed under control pressure (p.sub.S) by a valve assembly via a distributor apparatus and closes an overflow channel leading out of the pump work chamber. In order to control the end of injection, the control slide during its return stroke again relieves this overflow channel toward a low-pressure line. The control pressure (p.sub.

Abstract: An apparatus is proposed for positionally fixing a drive shaft disposed in a fuel injection pump for internal combustion engines in a predetermined rotary position, in particular one associated with the onset of fuel supply, and for measuring and testing this rotary position. The apparatus is provided with an apparatus into the reception bore of which either a holder element or an electric pulse transducer can be inserted. An element firmly connected with the drive shaft is provided with an angle-indicator marking, which is equipped both as a coupling element for the position-fixing apparatus and as a pulse trigger for the pulse transducer. The apparatus can thus be used both as a locking apparatus for mounting the injection pump on the engine and, with the pulse transducer inserted, as a measurement and testing apparatus.

Abstract: In the method according to the invention, the inlet pressure and the inlet cross section of the fuel pre-stored in the pump work chamber is constant, and it is solely the opening duration of an inlet valve which is electrically regulated. In addition, a shift in the instant of supply onset controlled in accordance with operating characteristics is attained by means of a variation in the return-flow fuel quantity. A shift in the instant of supply onset, which is undesired when there is a change in the quantity of fuel to be injected, is prevented by means of a simultaneously-effected correction of the return-flow fuel quantity. A fuel injection apparatus suitable for performing the method has, as the inlet valve, a magnetic valve which determines the quantity of fuel pre-stored in the pump work chamber. The rotary position of the pump piston is variable in order to shift or correct the instant of supply onset by means of an adjacent device actuated by an electromechanical adjustment element.

Abstract: An apparatus is proposed which serves the purpose of controlling the exhaust gas recirculation quantity and the injection quantity in auto-igniting internal combustion engines. In this apparatus, an arbitrarily actuatable throttle valve is provided in the intake manifold, downstream of which a control pressure is withdrawn from the intake manifold and used to actuate a pneumatic adjustment device which determines the position of the quantity adjustment device of a fuel injection pump. This control pressure simultaneously serves to actuate an exhaust gas recirculation valve and acts counter to the force of a restoring spring in the work chamber of a second pneumatic adjustment device.

Abstract: A fuel injection pump is disclosed in which the minimum injection quantity or idling rpm is determined by an arbitrarily adjustable stop. This stop is adjusted via a heatable bimetallic spiral, which acts counter to a spiral spring for the purpose of force compensation.

Abstract: A method is proposed in which the injection pump, having been adjusted in terms of the supply quantity and of the supply onset, is provided on a test bench, before being mounted on the internal combustion engine, with an electric pulse transducer, whose mounted position is marked on the injection pump. The pump may also be corrected, at a fixed test rpm, to a set-point value fixed relative to the supply onset signal by means of measuring the signal distance between the supply onset signal of a signal transducer measuring the dynamic supply onset and the rotary-position signal of the pulse transducer. The injection pump, with the camshaft rotated into the rotary position associated with the dynamic supply onset, is mounted on the engine which has been brought with its crankshaft into the associated working position.

Abstract: The invention relates to a control apparatus for the variation of the onset of supply by a fuel injection pump having an adjustment piston engaging the piston cam drive, the adjustment piston under rpm-dependent pressure being adjustable counter to a restoring force by a fluid located in a work chamber of the adjustment piston, and an assembly for prolonging the supply time and at least during pump supply on the basis of the restoring and reactionary force including displacing the adjustment piston counter to the fluid pressure.

Abstract: An injection timing device is proposed for internal combustion engines, by means of which the mutual rotary position of the output shaft with respect to the input shaft can be varied in dependence on the speed and on at least one further operating parameter. The timing device comprises flyweights, operating in dependence on the speed against the force of resetting springs, and hydraulically operated control elements which engage the flyweights, these control elements, which are effective radially toward the outside, being accommodated within the timing element. By changing the position of the control elements, the radial position of the flyweights, which otherwise is determined only by centrifugal force, can be additionally varied in dependence on at least one further operating parameter of the engine, preferably the load, in order to correct the instant of injection.

Abstract: A fuel injection apparatus for internal combustion engines, in particular food Diesel engines, including a mechanically driven injection pump, preferably embodies as a pump/nozzle assembly, in which the piston speed of the pump piston is variable for the purpose of controlling the peak pressure. By means of a control apparatus, operating in accordance with rpm, the stroke motion which is transmitted from a drive cam to the pump piston is varied by shifting the effective cam range during the fuel supply stroke, or by varying the lever ratio in the drive apparatus of the pump piston in such a manner that the piston speed, which otherwise varies in proportion to the engine speed, remains either substantially constant or is adapted to a predetermined speed variation.

Abstract: An injection timing device is proposed for internal combustion engines, by means of which the mutual rotary position of the output shaft with respect to the input shaft can be varied at least in dependence on the speed. The timing device comprises at least one pair of eccentrics which serve as the adjusting gear system and comprises an adjusting eccentric and a compensating eccentric, this pair of eccentrics being supported in a bearing member connected to one of the shafts, the adjusting eccentric of this pair also being coupled by means of a transmission member with a hydraulically operable servo piston. By a positional change of the servo piston effected by the hydraulic medium, the adjusting eccentric can be rotated to change the instant of injection.

Abstract: An apparatus is proposed which serves the purpose of controlling the exhaust gas recirculation quantity and the injection quantity in auto-igniting internal combustion engines. In this apparatus, an arbitrarily actuatable throttle valve is provided in the intake manifold, downstream of which a control pressure is withdrawn from the intake manifold and used to actuate a pneumatic adjustment device which determines the position of the quantity adjustment device of a fuel injection pump. This control pressure simultaneously serves to actuate an exhaust gas recirculation valve and acts counter to the force of a restoring spring in the work chamber of a second pneumatic adjustment device.

Abstract: An apparatus is proposed which serves the purpose of load-dependent actuation of an adjustment device, wherein the cross section and/or the pressure drop of an exhaust recirculation line in an internal combustion engine can be varied in accordance with load. An injection pump of conventional design is associated with the internal combustion engine and further includes a quantity adjustment device, the position of which acts as a control variable for the load. With this control variable, a booster apparatus is controlled via a comparison apparatus; the output variable of the booster apparatus in turn is the control variable for the actuation of an adjustment device which acts on an exhaust recirculation control apparatus. When a threshold value for load is exceeded, the exhaust recirculation is precluded. The control variable is preferably formed as a fuel pressure signal with the fuel withdrawn from the suction chamber of the injection pump.

Abstract: A hydraulically driven piston pump and nozzle assembly for a high pressure fuel injection system is proposed, in particular one for Diesel engines, which has an assembly for raising the closing pressure for the purpose of accomplishing a rapid valve needle closing at the injection nozzle. The assembly substantially comprises a closing pressure chamber disposed in the region of the valve needle end remote from the valve seat, which chamber communicates via an overflow channel with an auxiliary pump chamber of an auxiliary pump piston which is driven together with the pump piston. At the termination of fuel delivery, fuel under increased pressure is conducted from the auxiliary pump chamber into the closing pressure chamber, from when this pressure is exerted, at least indirectly, upon the valve needle to cause an accelerated valve needle closing.

Abstract: A fuel injection apparatus particularly suitable for high-powered engines, in which the pressure chamber of the fuel injection valve or valves is relieved of pressure during the pauses between injections by means of a correspondingly controlled obturation mechanism so that, when the valves are not tight, the undesirable injection of fuel during the pauses between injections is substantially prevented.

Abstract: Associated with the fuel controller of a supercharged diesel engine is a mechanism which limits the maximum fuel quantity in all operational states as defined by engine speed and air flow rate. This mechanism includes a three dimensional cam, displaced in rotation by a first transducer responsive to rpm or air flow rate and further displaced axially by a second transducer responsive to the other of these variables. A cam follower attached to the main fuel control rod of the controller makes contact with and follows the surface of the cam, thereby limiting the maximum fuel quantity admitted to the engine. Special provisions permit an enlarged starting fuel quantity and also permit corrections on the basis of further parameters, such as temperature. Several embodiments are presented.

Abstract: A fuel injection pump for internal combustion engines includes a reciprocating and rotating pump piston. Fuel delivery to the pressure line connected to an injection valve can be interrupted by the opening of a main control orifice in the wall of the cylinder which permits fuel to return to a low pressure volume of the pump. In order to provide for pressure relief of the pressure line when no injection takes place, there are provided a pressure control valve and a pressure relief conduit which bypasses this valve. The pressure relief conduit terminates in an auxiliary control orifice in the wall of the cylinder and is also obturated by the piston during its motion. The two control orifices are so located as to be opened in a predetermined sequence. The piston surface includes portions which block the auxiliary control orifice during engine starting.

Abstract: A centrifugal force speed governor for fuel injected internal combustion engines having at least a negative adjustment capability. In such a centrifugal force speed governor the following structural components are included: speed responsive structure; at least one adaptation spring; an adjustment member; an intermediate lever; a yield support; a control element; a stop; an energy storing structure; and a setting lever having a pin mounted thereto. The adjustment member is coupled to the speed responsive structure, the adaptation spring, the control element and through the control element to the yield support, while the setting lever engages, with its pin, the intermediate lever, the control element and the energy storing structure. When the adjustment member is displaced by the speed responsive structure and under the regulation of the adaptation spring, a displacement of the intermediate lever via the control element and the setting lever pin occurs.