Components & Functions: Actuator

Actuator consists of a bi-directional electric motor, magnetic clutch, potentiometer (rotary angle sensor) and control arm. Control arm is connected to actuator cable which moves throttle plate. Electric motor responds to on-off duty cycle signals from cruise control ECU. When motor operates, control arm moves. Cruise control ECU monitors rotary angle of control arm by applying a reference voltage to potentiometer.

A magnetic clutch connects motor shaft to control arm when cruise control ECU turns magnetic clutch on. If any of following conditions occur, cruise control ECU turns magnetic clutch off, disengaging motor shaft from control arm.

• Cruise main switch is turned off.
• CANCEL switch is turned on.
• Brake pedal is pressed.
• Parking brake is applied.
• Vehicle speed decreases to less than 25 MPH.
• Difference between actual and set speeds is 10 MPH.
• Stoplight switch circuit malfunction.
• Actuator motor malfunctions.
• Vehicle speed sensor malfunctions.
• Circuit problem occurs.