Cruise Control: Description and Operation

SYSTEM OUTLINE

The cruise control system allows to travel at a constant speed, by the operation of the switch, without having to depress the accelerator pedal. In this system, the engine throttle valve opening angle is adjusted automatically to control the vehicle at a constant speed.

1. SET OPERATION
When the cruise control main SW is turned ON, the cruise control system enters into standby mode, and the indicator light in the combination meter is turned ON.

2. SET SPEED CONTROL
When the SET/COAST switch is operated while traveling with the main SW ON, the speed when the switch is operated to OFF (Switch released) is memorized, and the vehicle speed is controlled at that speed.

3. COAST CONTROL
When the SET/COAST switch is operated to ON, the motor in the actuator rotates the throttle valve until it is closed fully to decrease the vehicle speed, and the speed when the switch is operated to OFF is memorized, and the vehicle speed is controlled at that speed. Furthermore, every time the SET/COAST switch is operated momentarily (Approximately 0.5 sec.) to ON, the memorized vehicle speed is decreased by approximately 1.5 km/h.

4. ACCEL CONTROL
When the RESUME/ACCEL switch is operated to ON, the motor in the actuator rotates the throttle valve to open direction to increase the vehicle speed, and the speed when the switch is operated to OFF is memorized, and the vehicle speed is controlled at that speed.
Furthermore, every time the RESUME/ACCEL switch is operated momentarily (Approximately 0.5 sec.) to ON, the memorized vehicle speed is increased by approximately 1.5 km/h.

5. MANUAL CANCEL MECHANISM
If any of the following signals are input during cruise control traveling, the cruise control is canceled.
1. Stop light SW is ON (Brake pedal is depressed)
2. Park/Neutral Position SW D circuit is turned from ON to OFF (A/T)
3. Cruise control clutch SW is ON (Clutch pedal is depressed) (M/T)
4. The CANCEL SW of the control SW is ON
5. The Main SW is turned OFF

6. RESUME CONTROL
After canceling the cruise control (Except when the main SW is OFF) if the vehicle speed is above the minimum speed limit (Approximately 40 km/h, 25 mph), operating the RESUME/ACCEL switch from OFF to ON will cause the system to accelerate and resume to the vehicle speed before manual cancellation.

7. ELECTRONICALLY CONTROLLED TRANSMISSION CONTROL
During cruise control traveling, communication control is made to fix the electronically controlled transmission in normal pattern. However, in this case the indicator of the electronically controlled transmission does not change.

8. OVERDRIVE FUNCTION
While traveling with the cruise control, if the overdrive cut speed is reached on an upgrade hill, (Memorized speed minus 4 km/h) the overdrive is released (O/D OFF) immediately.
This function increases the vehicle's traction so that the vehicle speed does not drop.

9. AUTO CANCEL OPERATION
If any of the following conditions are detected, the set speed is erased and the control is canceled.
1. Disconnection or short in the Stop Light SW
2. Abnormality in vehicle speed signal
3. Abnormality in the actuator
4. The actual vehicle speed becomes slower than the minimum speed limit