Robert Boschgmbh

Gunther Honig

Uwe Kiencke

Alfred Schulz

Control signals for triggering the events to be controlled, via at least one output stage (13, 14), are generated in a vehicular computer (11) as a dependent function of the output signals of a sensor (10) coupled to a rotating shaft of the engine, and of further sensors dependent on other operating parameters. At least one sensor-controlled auxiliary control device (17, 18) is provided. The output signals of the auxiliary control devices (17, 18) are transmitted via a switching device (12) to the terminal control stages (13, 14) as an alternative to the output signals of the computer (11). The switching device (12) is preferably embodied as a multiplexer and is controllable by an error decoding stage (19) for decoding and monitoring serial, or parallel, signals of the computer (11) to determine proper function of the computer (11); in case of malfunction of the computer (11), decoding stage (19) causes control of the output stage, or stages (13, 14) from the respective auxiliary control device.

Apparatus for the control of repetitive events dependent on operating

To permit low differences between regulated output voltage and unregulated input voltage, for example in the order of only 200mV, a control loop formed of a serially connected PNP transistor 11, a reference voltage generator 15, a voltage divider 13 connected across the regulated output, and a comparator-amplifier 14 comparing the output taken from the voltage divider 13 and the reference and providing an error control signal has a second control loop connected thereto which includes a transistor and a current sensing resistor connected to the base of the control transistor 11 and a second comparator comparing the actual current flow through the transistor 18 and the error signal to stabilize the control transistor. A switching network 16 can be additionally connected to modify or affect the error signal applied to the second control loop.

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Ditzingen, Germany

Gunther Honig