Cruise Control Servo: Description and Operation

Actuator:

The cruise control (CC) actuator (M16) receives its control impulses from the control module and actuates the throttle control by way of connecting rods. It consists of an electric motor with gear drive, a one-way clutch, a potentiometer and an electromagnetic clutch.
The actuator's electric motor transmits motion to the output shaft with the one-way clutch via the gear unit.

The one-way clutch makes it possible to over-ride the activated cruise control, e.g. when using the accelerator pedal to increase vehicle speed during overtaking maneuvers.

The potentiometer monitors the output shaft's position for the control module.

The electromagnetic clutch controls the gear providing positive engagement between the electric motor and the output shaft.

The actuator's electromagnetic clutch is activated at the following switch positions:
Accelerate - Set
Decelerate - Set
Memory

The electromagnetic clutch is deactivated when the brakes are applied, as well as when the control rod assumes the idle position after the unit is switched off with the pushbutton switch.

When the electromagnetic clutch is deactivated, a return spring pulls back a gear to immediately disengage the mechanism.