CRUISE CONTROL SYSTEM (for 1WW) SYSTEM DESCRIPTION


  1. CRUISE CONTROL SYSTEM

    This system is controlled by the driving support ECU and actuated by the throttle body. The driving support ECU controls the following functions: ON-OFF, -SET, +RES, CANCEL, vehicle speed operation, throttle motor output control.


    • The driving support ECU compares the driving vehicle speed from the vehicle speed sensor with the stored vehicle speed set through the cruise control main switch. The driving support ECU controls the throttle motor of the throttle body to open the valve when the driving speed is less than the stored speed.

    • The driving support ECU receives signals such as ON-OFF, -SET, +RES and CANCEL from the cruise control main switch and executes the corresponding function.

    • The driving support ECU illuminates the cruise control indicator light on the combination meter when it receives the cruise control switch on signal.

    • A01IPDLE07
      Text in Illustration
      *1 Cruise Control Indicator Light
      *2 Cruise Control SET Indicator

      The driving support ECU illuminates the combination meter assembly cruise control SET indicator light when vehicle speed control begins after the cruise control switch is pushed to -/SET while driving.

    • The driving support ECU cancels cruise control when the brake pedal is depressed and the driving support ECU receives the stop light switch signal.

    • The driving support ECU cancels cruise control when the clutch pedal is depressed and the driving support ECU receives the clutch switch signal.

  2. LIMIT CONTROL


    1. Low speed limit

      The lower limit of the speed setting range is set at approximately 40 km/h (25 mph). The cruise control system cannot be set when the driving vehicle speed is below the low speed limit. The cruise control operation will be automatically canceled but the stored vehicle speed will be retained when the vehicle speed decreases below the low speed limit of 40 km/h (25 mph) while cruise control is in operation.

    2. High speed limit

      The upper limit of the speed setting range is set at approximately 200 km/h (125 mph). The cruise control system cannot be set when the driving vehicle speed is over the high speed limit. Also, +RES cannot be used to increase speed beyond the high speed limit.

  3. OPERATION OF CRUISE CONTROL

    The cruise control main switch is used to operate 7 functions: SET, COAST, TAP-DOWN, RES (RESUME), ACCELERATION, TAP-UP and CANCEL. The SET, TAP-DOWN and COAST functions and the RES (RESUME), TAP-UP and ACCELERATION functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while holding it in each direction and turns off after releasing it.


    1. SET CONTROL

      The vehicle speed is stored and constant speed control is initiated when pushing the switch to -SET while driving with the cruise control switch on (the cruise control indicator light is on) and with the vehicle speed within the set speed range (between the low and high speed limits).

    2. COAST CONTROL

      When the cruise control main switch is pushed to -SET and held in that position while the cruise control system is operating, the driving support ECU sends a instructs the ECM to reduce the fuel infection volume valve opening angle 0° demand signal to the throttle body. Then, the vehicle speed is stored and maintained when the cruise control main switch is released.

    3. TAP-DOWN CONTROL

      When tapping down the cruise control switch to -SET (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed decreases each time by approximately 1.6 km/h (1.0 mph). However, when the difference between the driving and stored vehicle speeds is more than approximately 5 km/h (3 mph), the stored vehicle speed is set to the actual vehicle speed at the moment the cruise control switch is released from -SET and constant speed control is initiated.

    4. ACCELERATION CONTROL

      The throttle motor of the throttle body is instructed by the driving support ECU to open the throttle valve when the cruise control main switch is pushed to +RES and held while the cruise control system is in operation. When the cruise control main switch is released from +RES, the vehicle speed is stored and the vehicle is controlled in order to maintain a constant speed.

    5. TAP-UP CONTROL

      When tapping up the cruise control main switch to +RES (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed increases each time by approximately 1.6 km/h (1.0 mph). However, when the difference between the driving and the stored vehicle speed is more than approximately 5 km/h (3 mph), the stored vehicle speed will not be changed.

    6. RES (RESUME) CONTROL

      If cruise control operation was canceled with the stop light switch, CANCEL switch, etc., and if the driving speed is within the set speed range, pushing the cruise control main switch to +RES restores the vehicle speed memorized at the time of cancellation, and initiates constant speed control.

    7. MANUAL CANCEL CONTROL

      Performing any of the following cancels cruise control while the system is operating (the stored vehicle speed in the driving support ECU is maintained).


      • Depressing the brake pedal

      • Pulling the cruise control switch to CANCEL

      • Driving the vehicle while the vehicle stability control system is operating

      • Turning the cruise control switch off (the stored vehicle speed in the driving support ECU is not maintained)

      • Depressing the clutch pedal

  4. AUTO CANCEL (FAIL-SAFE)

    This system has an automatic cancellation function (fail-safe) Click here.