System Description
CRUISE CONTROL: CRUISE CONTROL SYSTEM: 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 switch without using the accelerator pedal.
The power management control ECU receivers signals from each switch and sensor, and maintains constant vehicle speed by optimizing the use of the engine and motor driving force.
* The power management control ECU receives signals such as ON-OFF, - SET, + RES, and CANCEL from the cruise control switch and executes the command.
* The power management control ECU illuminates the combination meter assembly cruise control indicator light when it receives an ON signal from cruise control switch (ON-OFF button).
Text in Illustration
* The power management control ECU displays cruise control SET indication on the multi-information display when constant speed control is started by pushing the cruise control switch to -/SET.
* The power management control ECU cancels cruise control operation when the brake pedal is depressed and the power management control ECU receives a stop light switch signal.
* The power management control ECU cancels cruise control operation when the shift lever is moved from D to any other position.
2. LIMIT CONTROL
(a) Low speed limit
The lowest possible set speed is approximately 40 km/h (25 mph). The cruise control system cannot be set when the 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 of approximately 40 km/h (25 mph) while the cruise control is operating.
(b) High speed limit
The highest possible limit of the speed is approximately 200 km/h (125 mph). The cruise control system cannot be set when the vehicle speed is over the high speed limit. Also, + RES cannot be used to increase speed over the high speed limit.
3. CRUISE CONTROL OPERATION
The cruise control switch operates 7 functions: SET, - (COAST) , TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, and CANCEL. The SET, TAP-DOWN, and - functions, and the RES, TAP-UP, and + functions are operated with the same switch. The cruise control switch is an automatic return type switch which turns on only while it is being operated in the direction of each arrow and turns off after being released.
(a) SET CONTROL
The vehicle speed is stored and constant speed control is maintained when the cruise control switch is pushed to -/SET while driving with the cruise control switch (ON-OFF button) on (the cruise control indicator light is on and cruise control SET indication comes on), and the vehicle speed is within the set speed range (between the low and high speed limits).
(b) - (COAST) CONTROL
The power management 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 switch is pressed and held while the cruise control system is operating. When the cruise control 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 switch to -/SET (for 0.6 seconds or less) while the cruise control system is operating, the stored vehicle speed decreases each time by approximately 1.6 km/h (1 mph). When the cruise control switch is released from -/SET and the difference between the driving and stored vehicle speeds is more than approximately 5 km/h (3 mph), the vehicle speed is stored and constant speed control is maintained.
(d) + (ACCEL) CONTROL
The power management control ECU increases the cruise control demand speed and controls the engine and motor driving force to accelerate the vehicle when pushing and holding the cruise control switch to +/RES while the cruise control system is operating.
When the cruise control 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 switch to +/RES (for 0.6 seconds or less) while the cruise control system is operating, the stored vehicle speed increases each time by approximately 1.6 km/h (1 mph). However, when the difference between the driving and the stored vehicle speeds is more than approximately 5 km/h (3 mph), the stored vehicle speed will not be changed.
(f) RES (RESUME) CONTROL
If cruise control operation was canceled with the stop light switch assembly or the CANCEL switch, and if driving speed is within the limit range, pushing the cruise control switch to +/RES restores vehicle speed memorized at the time of cancellation, and maintains constant speed control.
(g) MANUAL CANCEL CONTROL
Performing any of the following cancels the cruise control system while it is operating (the stored vehicle speed in the power management control ECU is maintained).
* Depressing the brake pedal
* Moving the shift lever from D to any other position
* Pushing the cruise control switch to CANCEL
* Turning the cruise control switch (ON-OFF button) off (the stored vehicle speed in the power management control ECU is not maintained)
4. AUTO CANCEL (FAIL-SAFE)
This system has an automatic cancellation function (fail-safe) Fail-Safe Chart.