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Cruise Control: Description and Operation















CRUISE CONTROL: CRUISE CONTROL SYSTEM: SYSTEM DIAGRAM

SYSTEM DIAGRAM





Communication Table:






SYSTEM DESCRIPTION

1. CRUISE CONTROL SYSTEM
The cruise control system maintains constant vehicle speed. It enables the driver to adjust the vehicle speed by operating the cruise control main switch without using the accelerator pedal.
The hybrid vehicle control ECU receives signals from each switch and sensor, and maintains constant vehicle speed by optimizing the use of the engine and motor driving force.

- The hybrid vehicle control ECU receives signals such as ON-OFF, - (COAST)/SET, + (ACCEL)/RES (RESUME), and CANCEL from the cruise control main switch and executes the appropriate command.
- The hybrid vehicle control ECU illuminates the combination meter's CRUISE main indicator light when it receives a cruise control main switch ON signal.
- The hybrid vehicle control ECU cancels the cruise control system when the brake pedal is depressed and the hybrid vehicle control ECU receives a stop light switch signal.
- The hybrid vehicle control ECU receives a shift lever position sensor signal and cancels the cruise control system when the shift lever is moved from the D to the N or B position.

2. LIMIT CONTROL
(a) Low speed limit
The lowest possible limit of the speed setting range is approximately 40 km/h (25 mph). The cruise control system cannot be set when the driving vehicle speed is below the low speed limit. Cruise control operation will be automatically canceled but the stored vehicle speed will be retained when the vehicle speed drops below the low speed limit 40 km/h (25 mph) while the cruise control is in operation.
(b) High speed limit
The highest possible limit of the speed setting range is approximately 200 km/h (125 mph). The cruise control system cannot be set when the driving vehicle speed exceeds the high speed limit. Also, + (ACCEL)/RES (RESUME) cannot be used to increase speed beyond the high speed limit.
3. OPERATION OF CRUISE CONTROL
The cruise control main switch operates 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, and CANCEL. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it.
(a) SET CONTROL
The vehicle speed is stored and constant speed control is maintained when pushing the cruise control main switch to - (COAST)/SET while driving with the main switch on (the CRUISE main indicator light is on), and the vehicle speed is within the set speed range (between the low and high speed limits).
(b) - (COAST) CONTROL
The hybrid vehicle control ECU decreases the cruise control demand speed and controls the engine and motor driving force to decelerate the vehicle when -/SET on the cruise control main switch is pressed and held while the cruise control system is in operation. When the cruise control main switch is released from -/SET, vehicle speed is stored and constant speed control is maintained.
(c) TAP-DOWN CONTROL
When tapping down the cruise control main switch to - (COAST)/SET (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed decreases by approximately 1.6 km/h (1.0 mph) at each tap. When the cruise control main switch is released from - (COAST)/SET and the difference between the driving and stored vehicle speed is more than 5 km/h (approximately 3 mph), the driving vehicle speed is stored and constant speed control is maintained.
(d) ACCELERATION CONTROL
The hybrid vehicle control ECU increases the cruise control demand speed and controls the engine and motor driving force to accelerate the vehicle when +/RES on the cruise control main switch is pressed and held while the cruise control system is in operation.
When the cruise control main switch is released from +/RES, vehicle speed is stored and constant speed control is maintained.
(e) TAP-UP CONTROL
When tapping up the cruise control main switch to + (ACCEL)/RES (RESUME) (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed increases by approximately 1.6 km/h (1.0 mph) at each tap. However, when the difference between the driving and the stored vehicle speed is more than 5 km/h (approximately 3 mph), the stored vehicle speed will not be changed.
(f) RESUME CONTROL
If cruise control operation was canceled under any of the manual cancel conditions (other than turning the cruise control main switch off), and if the driving speed is above the low speed limit, pushing the cruise control main switch to + (ACCEL)/RES (RESUME) restores the vehicle speed memorized at the time of cancellation, and maintains constant speed control.
(g) MANUAL CANCEL CONTROL
Performing any of the following will cancel the cruise control system while in operation (the stored vehicle speed in the hybrid vehicle control ECU will be maintained).
- Pulling the cruise control main switch to CANCEL
- Depressing the brake pedal
- Moving the shift lever from the D to the N or B position.
- Turning the cruise control main switch off (the stored vehicle speed in the hybrid vehicle control ECU will not be maintained).

4. AUTO CANCEL (FAIL-SAFE)
This system has an automatic cancellation function (fail-safe) Fail-Safe Chart.
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