Itt Industries, Inc.

Wolfgang Spieth

Hans Prohaska

Horst Goertler

Horst Rachner

Marcel Andrei-Alexandru

Gunther Gille

Friedrich Hetzel

Uwe Knobloch

Hans Muller

Walter Steeb

A safety control circuit for electric motors of power windows of automotive vehicles and which differentiates between a tight fitting of the window pane and an obstacle blockage. The motor current is selectively detected to provide a signal representative of the instantaneous rather than static current values. The detected signal is compared to a reference signal. When the detected signal exceeds the reference signal by a given value or longer than a predetermined interval, which indicates that an obstacle blockage has occurred, the motor current is switched off or reversed.

Circuit arrangement for power windows

A circuit arrangement for a wiper motor, of the type comprising a controllable switching element for switching a motor operating circuit, wherein the switching element is controllable by a manually actuable operating switch and by a disconnection signal of a limit switch. The disconnection signal of the limit switch is directly conducted to the switching element through the motor supply lead itself. Thus, an inexpensive single-conductor cabling arrangement is realized.

Circuit arrangement for a wiper driving motor

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Freiberg, Germany

Wolfgang Spieth