Control system for an internal combustion engine in a motor vehicle

A control system for an internal combustion engine in a motor vehicle for actuating a regulating member in the intake manifold system of the engine in response to driver actuation of a command member, the regulating member being driven by an electromagnetic servomotor and the control system comprising;

• first sensor means for responding to the position of the command member to provide a command signal indicative of a desired position;
• second sensor means for responding to the actual position of the regulating member to provide a feedback signal indicative of an actual position of said regulating member;
• a comparator for responding to both of said signals for controlling an actuating signal for driving the electromagnetic servomotor;
• safety means for responding to a substantial disconformity between said desired position of said command member and said actual position of the regulating member to cause a substantial reduction in engine speed under predetermined conditions;
• and,
• said safety means including;
• third sensor means for responding to the position of the command member to produce a signal;
• a threshold value switch for providing an output signal when said signal of said third sensor means is equal to or greater than a predetermined voltage (V.sub.1);
• switch means for responding to the position of the regulating member to provide an output signal when the regulating member is within a predetermined range of positions from and including its engine idling position;
• and, speed reduction means for reducing the speed of the engine when both said output signal of said threshold value switch and said output signal of said switch means are not present.