Friedmann & Maier Aktiengesellschaft

Robert Boschgmbh

Gerhard Lehner

Theodor Stipek

Jaroslaw Hlousek

Georg Brasseur

Heinz Rathmayr

Peter Herzog

An injection pump for internal combustion engines having a pump piston bushing, a pump piston, guided in the bushing, including control edges for controlling the beginning and end of an injection event. The control edges cooperate with control bores provided in the wall of the pump piston bushing that discharge into a reservoir chamber surrounding the pump piston bushing; fuel can be delivered into this chamber under pressure, and excess fuel, or fuel overflowing at the end of an injection event, can be diverted from it. For the fuel delivery, a suction valve opening to the reservoir chamber is connected to the reservoir chamber, while for the fuel diversion, a check valve in the form of a pressure maintenance valve that opens away from the reservoir chamber is connected to the reservoir chamber. This pressure maintenance valve may be preceded on the inlet side by a throttle restriction.

Injection pump for internal combustion engines

The control rod system for the fuel injection devices being designed as pump-nozzle-units (1) for Diesel engines comprises two control rods (7, 8) offset transversely relative to the axis to the pump-nozzle-unit and in longitudinal direction of this axis, said control rods being connected via slide pieces (11, 12) and lever arms (15, 16) with the control shafts (9, 10) rotatably supported on the engine and being common for all pump-nozzle-units (1). As seen in axial direction of the pump-nozzle-unit (1), at least the slide piece (12) located less remote from the nozzle is, with retracted control rod (8), not overlapping the control shaft (9) which is located more remote from the nozzle, so that dismounting of the pump-nozzle-unit by moving it upwardly can be effected without dismounting the control shaft (FIG. 5).

Control rod system for fuel injection devices for Diesel engines

In a control equipment for adjusting the moment of fuel injection and/or the amount of fuel supplied by a fuel injection pump in internal combustion engines, at least one mechanical energy accumulator (9, 10) is provided between an adjusting member (2, 3) for the begin of fuel supply and/or for the amount of fuel supplied and an electrical servomotor (4), said energy accumulator comprising two mutually movable spring collars (12, 13) between which is accommodated a pre-stressed compression spring (11) and the maximum distance of which one from the other is limited by abutments (14, 15) of a housing surrounding the spring collars. (FIG. 1).

Control equipment for adjusting the moment of fuel injection and/or

In a process for controlling the beginning of delivery of a fuel injection pump for internal combustion engines having fuel injection, particularly Diesel engines, in dependence on the torque and under consideration of immediately measurable operation parameters, at least the revolution speed. The torque is determined from the intake boost pressure generated by a turbocharger and optionally from that amount of air which is blown off at increasing revolution speed above a certain intake boost pressure. A device for performing said process comprises a processor for performing at least one calculating operation provided with a store for storing the program to be executed, sensors transmitting signals to the processor representative of operation parameters of the injection-type internal combustion engine, and actuating means for controlling the beginning of fuel delivery of the fuel injection pump being connected with the processor. For determining the torque delivered by the engine there is provided a sensor for the intake boost pressure and a further sensor designed as pressure transducer for the differential pressure at a restriction for supplying to the processor a value corresponding to the air blown off.

Growing community of inventors

Hallein, Austria

Gerhard Lehner