Robert Boschgmbh

Herbert Graf

Werner Zimmermann

Nestor Rodriguez-Amaya

Johannes Locher

Alfred Schmitt

Joachim Tauscher

Anton Karle

Pierre Lauvin

Hans-Joachim Siebert

Thomas Bielesch

Bernd Wichert

Dominique Buisson

Henri Paganon

Lucien Hehn

Jurgen Schwenger

Juergen Schwenger

Method and device for triggering an electromagnetic consumer

The invention relates to an electronic circuit arrangement for triggering excitation windings of electromagnetic components, provided with supplementary circuit elements, in particular free-running circuit elements, preferably solenoid valves (MV.sub.1 to MV.sub.n), whereby in order to provide a flexible open-loop control, the components are each connected in series to a controllable contact element (3). To reduce the degree of complexity of the circuit, the manufacturing price and the space requirement, it is proposed that the connecting terminals (1, 4) of this series connection lead directly, and the connections (2) between the components (MV.sub.1 to MV.sub.n) and the contact elements (3) lead via diodes (D.sub.1 to D.sub.n), respectively, to a collecting point (A, B, C), to which collecting points (A, B, C) is linked one and the same supplementary circuit-element configuration (T.sub.F,C.sub.L,10,11) shared by all components. Accordingly, the component parts of the supplementary circuit elements are subject to multiple use; they are available to all of the electromagnetic components.

Electronic circuit arrangement for triggering solenoid valves

A method and apparatus for controlling the flow of fuel for a gasoline or diesel gasoline engine controls a solenoid valve for actuating the fuel pump. A pump piston is driven by the camshaft and, in turn, pressurizes the fuel for delivery to the individual cylinders. Based on the operation of the solenoid valve, the beginning of the injection of fuel and the end of the injection of fuel are established Based upon spaced angular markings on the camshaft, a control unit determines the trigger signals for actuating the solenoid valve. To calculate the trigger signals, the markings on the camshaft are counted and interpolated therebetween over time. The interpolation is based on the instantaneous rotational speed N of the camshaft, which is sensed immediately before performing the interpolation.

Method and apparatus for controlling a fuel pump

Process and apparatus for controlling and measuring the movement of an

The invention is directed to a control apparatus cooling system which includes a control apparatus arrangement for an internal combustion engine. The control apparatus arrangement is set into operation by an ignition contact signal. The control apparatus arrangement is cooled with the aid of a coolant loop which has a pump motor. A self-holding circuit is provided in the control apparatus arrangement and supplies the pump motor and a voltage stabilization with voltage to drive a microcomputer as soon as the ignition contact signal appears. The cooling of the control apparatus arrangement is not terminated immediately when the ignition contact signal ceases; instead, the pump motor continues to run until it is assured that components having conventional temperature resistance cannot become damaged in the control apparatus arrangement by overheating because of stored heat. The microcomputer determines when the switch-off condition is satisfied. This cooling system affords the advantage that components of conventional temperature resistance can be utilized in the control apparatus arrangement. Furthermore, the advantage is afforded that even after the ignition contact signal ceases, the microcomputer can still conduct self-diagnostic procedures which in conventional systems can only be carried out when the engine is started which then leads to a delay when starting the engine.

Combined control apparatus and cooling system for an internal combustion

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Ditzingen, Germany

Herbert Graf