System Outline

The cruise control system is a constant vehicle speed controller with which it is possible to automatically adjust the opening of the engine throttle valve without depressing the accelerator pedal, but by operating a switch instead.

1. Constant Speed Control 

   If the actual vehicle speed rises above the set vehicle speed, a signal is sent to the electric throttle motor in order to close the throttle valve. Conversely, if the vehicle speed falls below the set vehicle speed, a signal is sent to the electric throttle motor in order to open the throttle valve.

2. Setting 

   If the - SET SW is pressed while the ON-OFF SW is ON (and the vehicle speed is within the settable range: Above the low speed limit and below the high speed limit), then the vehicle speed at the point at which the switch is released will be stored in memory and the vehicle will be controlled to drive constantly at that speed.

3. Coast, Tap Down 

   <Coast

   If the - SET SW is held down while driving with the cruise control active, the coast control sets the cruise control request opening to 'Zero' (Note: the throttle valve can not be completely closed due to ISC, etc.) to gradually and continuously decelerate the vehicle as long as the switch is held down. It then stores in memory the vehicle speed at which the switch is released and controls the vehicle to drive constantly at that speed.

   <Tap down

   If the - SET SW is pressed momentarily (Approx. 0.5 sec.), the set vehicle speed is reduced in steps of approximately 1.6 km/h every time the switch is pressed. If the tap down operation attempts to put difference of more than 5 km/h between the set vehicle speed and the actual vehicle speed, then the vehicle speed at which the switch is released will be stored in the memory and the vehicle will be controlled to drive constantly at that speed.

4. Acceleration, Tap Up 

   <Acceleration

   If the + RES SW is held down while driving with the cruise control active, the acceleration control rotates the electric throttle motor to open the throttle valve to gradually and continuously accelerate vehicle. It then stores in memory the vehicle speed at which the switch is released and controls the vehicle to drive constantly at that speed.

   <Tap up

   If the + RES SW is pressed momentarily (Approx. 0.5 sec.), the set vehicle speed is increased in steps of approximately 1.6 km/h every time the switch is pressed. If the difference between the set vehicle speed and actual vehicle speed becomes more than 5 km/h, the tap up operation will not change the set vehicle speed further.

5. Low Speed Limit 

   This is the lowest speed to which the cruise control can be set and is approximately 40 km/h. The cruise control cannot be set if the vehicle speed is below than the low speed limit. If the vehicle speed drops below the low speed limit while driving with the cruise control active, the cruise control will be automatically cancelled.

6. High Speed Limit 

   This is the highest speed to which the cruise control can be set and is approximately 100 km/h for domestic vehicles and 200 km/h for other destinations. The cruise control cannot be set if the vehicle speed is higher than the high speed limit. Further, the vehicle cannot be accelerated above the high speed limit using the + RES SW.

7. Cancel 

   If any of the following signals are received while driving with the cruise control active, the cruise control will be cancelled.

   1. Stop lamp switch comes ON
   2. D position circuit changes from ON to OFF in the park/neutral position SW
   3. If gear positions other than the D or 3 range are selected while the shift lever is in the M position
   4. CANCEL SW comes ON in the control switch
   5. ON-OFF SW goes OFF
8. Resume 

   As long as the vehicle speed stays above the low speed limit after the cruise control has been canceled due to one of the above signals, the cruise control will resume operation and return to the speed that was set at the time the cruise control was canceled if the + RES SW is pressed.

9. Over Drive Control 

   The over-drive may be cut when driving up a hill with the cruise control active. When the hill is judged to have finished (from the throttle opening information) and the over-drive has been cut, the over-drive will resume automatically after over-drive resume timer expires. However, if the vehicle speed drops below the over-drive minimum resuming speed before the over-drive resume timer expires, the set time will be reset but will begin counting down again if the vehicle speed returns to the over-drive minimum resuming speed.

10. Auto Cancel 

1. The set vehicle speed will be erased from memory and the cruise control will be cancelled under the conditions outlined below. Until the ON-OFF SW is turned ON again, the cruise operation indicator will blink and the cruise control cannot be activated.
   1. If the stop lamp switch is disconnected or short-circuits.
   2. If the vehicle speed signal is abnormal
   3. If the electronic throttle parts are abnormal
2. The set vehicle speed will be erased from memory and the cruise control will be cancelled under the conditions outlined below. The cruise operation indicator will blink and the cruise control cannot be activated unless the power switch is turned OFF.
   1. If the stop lamp switch input circuit is abnormal
   2. If the cancel circuit is abnormal
3. The set vehicle speed will be erased from memory and the cruise control will be cancelled under the following conditions.

1. If the vehicle speed falls below the low speed limit (Approx. 40 km/h).
2. If the vehicle speed falls to less than the set vehicle speed minus 16 km/h).