Cruise Control: Description and Operation

System Block Diagram:

Component Parts And Function Outline:

* CCM Cruise Control Module
* CC : Cruise Control

CRUISE CONTROL

Cruise control system is engaged by "CRUISE" main switch located on center instrument panel, right of steering wheel. 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 braket and transxale. 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 inside of steering wheel has two positions - "Normal" and "Depressed" The set position - With SET/COAST switch depressed and then release 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 depressed, 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 pressing and releasing SET/COAST switch. Do no hold Set/Coast switch in depressed position.

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

Resume/Accel switch

RESUME/ACCEL switch located on inside of steering wheel has two positions - "Normal" and "Depressed".

The resume position - With RESUME/ACCEL switch depressed 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 RESUME/ACCEL switch by constant acceleration.

The accel position - With RESUME/ACCEL switch depressed and held in, disengaging cruise control system, when vehicle has accelerated to required cruise speed, releasing RESUME/ACCEL 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 pressing and releasing RESUME/ACCEL switch less than 0.75 second. Do not hold RESUME/ACCEL switch is in depressed 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 pressing "CANCEL" switch.

Cruise speed canceled by this switch will be recover by RESUME/ACCEL switch.