System Outline

System Outline

The cruise control system is a constant vehicle speed controller in which control of the switch on the steering wheel makes it possible to automatically adjust the opening of the engine throttle valve without depressing of the accel pedal.

1. Set Operation
When the ON-OFF SW is turned on, the system starts preparations necessary for the cruise control and turns on the indicator light in the combination meter.

2. Set Speed Control
When the SET/ - SW is operated with the ON-OFF SW turned on during travelling, the constant vehicle speed is controlled.

3. Coast Control
When the SET/ - SW is kept turned on during cruise control travelling, the engine control module controls the throttle valve to decelerate the vehicle. Every time the SET/ - SW is turned on momentarily, the vehicle speed is decelerated by approximately 1.6 km/h. However, in the case of tap down operation to make more than a 5 km/h difference between the set speed and the actual vehicle speed, the device memories the speed when the switch was turned off and controls it at that speed constantly.

4. Accel Control
When the RES/+ SW is kept turned on during cruise control travelling, the engine control module controls the throttle valve to accelerate the vehicle. Every time the RES/+ SW is turned on momentarily, the vehicle speed is accelerated by approximately 1.6 km/h. However, in the case of tap-up operation to make more than a 5 km/h difference between the set speed and the actual vehicle speed, the device does not change the set speed. (Tap-up operation is not available.)

5. Resume Control
When the vehicle speed falls below the low speed limit and the cruise control is cancelled, the preset speed is retained in the memory. However, the resume control is available only when the vehicle speed exceeds the low speed limit.

6. Manual Cancel Mechanism
If any of the following signals is input during cruise control travelling, the cruise control is cancelled.
- The stop lamp SW is turned on. (The brake pedal is depressed)
- The CANCEL SW is turned on.
- The ON-OFF SW is turned off.
- The cruise control clutch SW is turned off. (M/T) (The clutch pedal is depressed)
- Gear is shifted from position D or 3 to other positions. (A/T)

7. Auto Cancel Function
If any of the following conditions is encountered, the cruise control is automatically cancelled.
- Disconnection and/or short in the stop light SW
- Malfunction in the vehicle speed signal
- Malfunction in the electronic throttle parts
- Malfunction in the stop lamp SW input circuit
- Malfunction in the cancel circuit
- The actual vehicle speed becomes slower than the minimum speed limit
- The actual vehicle speed becomes 16 km/h slower than the set speed

8. Overdrive Control Function
The overdrive is sometimes cut off on hills during cruise control driving. When the end of a climbing hills is determined by the throttle opening degree information after the overdrive has been canceled, control is reset to the overdrive condition after the overdrive resetting timer operation. Also, when the overdrive is cut off during accelerator control and resuming control, control is reset to the overdrive condition when the accelerator control and resuming control is finished.