Cruise Control: Description and Operation

CRUISE CONTROL SYSTEM

System Block Diagram:

SYSTEM BLOCK DIAGRAM




COMPONENT PARTS AND FUNCTION OUTLINE

CRUISE CONTROL
Cruise control system is engaged by "CRUISE" main switch located on right of steering wheel column. System has the capability to cruise, coast, resume speed, and accelerate, and raise "tap-up" or lower "tap-down" set speed. It also has a safety interrupt, engaged upon depressing brake or shifting select lever. Stepper motor cruise control (SMCC x.5) is a speed control system that maintains a required vehicle speed at normal driving conditions.

The main components of SMCC system are mode control switches, transaxle range switch, brake switch, vehicle speed sensor, cruise control module and control cable that connect throttle body.

SMCC system uses a cruise control module to gain the required vehicle cruise operation. Two important components of the module are an electronic controller and a electric stepper motor.

The controller monitors vehicle speed and operates the electric stepper motor. The motor moves a ribbon and throttle linkage, in response to controller, to maintain the desired cruise speed. The cruise control module contains a low speed limit which will prevent system engagement below a minimum speed of 40 km/h (25 mph). The operation of the controller is controlled by mode control switches located on steering wheel.

Transaxle range switch and brake switch are provided to disengage the cruise control system. The switches are on brake pedal bracket and transaxle. When the brake pedal depressed or select lever shifted, the cruise control system is electrically disengaged and the throttle is returned to the idle position. Cruise main switch

SMCC system is engaged by pressing "CRUISE" push button. Releasing "CRUISE" push button release throttle, clears cruise memory speed, and puts vehicle is a non-cruise mode.

Set/Coast switch
SET/COAST switch located on right of steering wheel column has two positions - "Normal" and "Push-down". The set position - with SET/COAST switch push-down and then released, the cruise speed will be set at the speed the vehicle was going when SET/COAST switch was released. The coast position - with SET/COAST switch fully push-down, driver can lower cruise speed. To decrease cruise speed, SET/COAST switch is held in, disengaging cruise control system. When vehicle has slowed to required cruise speed, releasing SET/COAST switch will re-engage speed at new selected speed.

The tap down - To lower vehicle speed, cruise must be engaged and operating. Tap down is done by quickly push-down and releasing SET/COAST switch. Do not hold SET/COAST switch in push-down position.

Tap down is a function in which cruise speed car be decreased by 1 mph (1.6 km/h)

Resume/Accel switch
RES/ACC switch located on right of steering wheel column has two positions - "Normal" and "Push-up".

The resume position - with RES/ACC switch push-up and then release, this switch also returns cruise control operation to last speed (Which is temporarily disengaged by Cancel switch or Brake pedal), setting when momentarily operating RES/ACC switch by constant acceleration.

The accel position - with RES/ACC switch push-up and held in, disengaging cruise control system, when vehicle has accelerated to required cruise speed, releasing RES/ACC switch will re-engage speed at new selected speed.

The tap up - To increase vehicle speed, the cruise must be engaged and operating.

Tap up is done by quickly push-up and releasing RES/ACC switch less than 0.75 second. Do not hold RES/ACC switch is in push-up position. Tap up is a function in which cruise speed can be increased by 1 mph (1.6 km/h).
Cancel switch

SMCC system is temporarily disengaged by pull "CANCEL" switch toward you.
Cruise speed canceled by this switch will be recover by RES/ACC switch.