Robert Boschgmbh

Jurgen Schwenger

Johannes Locher

Werner Zimmermann

Herbert Graf

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.

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Waiblingen, Germany

Jurgen Schwenger