Electrical regulating device for speed control devices

Claim 1

In an electrical regulating device, particularly for a speed control device for motor vehicles with a servomotor, a rotatably mounted setting element which actuates an adjustment actuator, the setting element being in operative connection with the servomotor via an electromagnetic coupling, and a monitoring stage for the mechanical functioning of the coupling, the improvement wherein the monitoring stage contains, means for detecting the resetting speed of the setting element or the adjustment actuator, means for comparing the actual resetting speed with a pregiven reference value, and means for producing a signal upon an unsafe deviation of the actual resetting speed from the reference value, said means for detecting the resetting speed constitutes an electrical position transmitter coupled with said setting element, a differentiator stage is connected to and following said transmitter, said comparing means comprises a comparator having one input connected to and following said differentiator stage, said signal producing means includes an AND gate having two inputs, said comparator has another input being applied with a reference voltage and an output connected to one of the inputs of said AND gate, the other input of said AND gate is appliable with a signal which releases the resetting of the setting element, a current supply line is connected to the speed control device, a switch is connected in said current supply line, the output of said AND gate is operatively connected to said switch, the latter constituting means for being opened to turn-off the control device when an output signal appears at the output of said AND gate.