Cruise Control: Description and Operation

Fig. 1 Cruise Control Module.:

PURPOSE
The Cruise Control regulates the speed of the vehicle in response to driver commands. The Electro-Motor Cruise Control System enables the operator to maintain a selected vehicle speed under normal driving conditions. Capabilities of the system include cruise, coast, resume speed, accelerate, tap-up and tap-down. Basic components of the cruise control system are the cruise control module, cruise control switches, electrical release switches and related electrical wiring.

DESCRIPTION
The cruise control module, Fig. 1, houses an electronic controller and an electric motor. The controller monitors vehicle speed and operates the motor accordingly. Desired cruise speed is maintained as the motor moves a connecting strap and throttle linkage. A low speed limit in the module prevents engagement of the system at vehicle speeds below 25 mph. Controller operation is varied by cruise control switches on the turn signal lever.
Electrical release switches are used to disengage the cruise control system. Two release switches are located on the brake pedal bracket and, on manual transmission models, an additional switch is mounted on the clutch pedal bracket. When the clutch or brake pedal is depressed, the cruise control system is disengaged and the throttle returns to idle.


OPERATION
The Cruise Control Module contains electronic circuitry and a stepper motor. The other system components are as follows:

^ Cruise Switch
^ Set Switch
^ Brake Switch
^ Clutch Switch
^ Vehicle Speed Sensor

The Cruise Control Module receives voltage from the GAUGES Fuse in RUN or START. A speed signal is received from the Vehicle Speed Sensor Buffer. The driver gives his input to the Cruise Control Module through the system components previously listed. The Cruise Control Module circuitry receives the driver's input and generates electrical pulses. These pulses cause the stepper motor and its output reel to rotate. The throttle is controlled by a cable wound on the output reel. The Cruise Control Module also contains a switch which releases the cable when the Cruise Control System must be shut off. This switch will operate when the Brake Pedal is depressed, the Clutch Pedal is depressed, the Cruise Control System is turned off or the Cruise Control System detects a failure.