CRUISE CONTROL SYSTEM(for Diesel) SYSTEM DESCRIPTION


  1. CRUISE CONTROL SYSTEM

    This system is controlled by the driving support ECU assembly, and control is performed via the ECM using the Injector assembly. The driving support ECU assembly controls the following functions: ON-OFF, -SET, +RES, CANCEL, vehicle speed operation.


    • The driving support ECU assembly compares the driving vehicle speed from the vehicle speed sensor with the stored vehicle speed set through the cruise control main switch. When the actual vehicle speed exceeds the stored vehicle speed, the driving support ECU assembly instructs the ECM to decrease the fuel injection volume. When the actual vehicle speed is lower than the stored vehicle speed, the driving support ECU assembly instructs the ECM to increase the fuel injection volume.

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

    • The driving support ECU assembly illuminates the cruise control SET indicator light in the combination meter assembly when the cruise control system is operated by pushing the cruise control main switch to -SET.

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

    • The driving support ECU assembly cancels cruise control when the clutch pedal is depressed.

  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 approximately 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 main 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 assembly instructs the ECM to reduce the fuel injection volume. 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 main switch to -SET (for 0.6 seconds or less) 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 main switch is released from -SET and constant speed control is initiated.

    4. ACCELERATION CONTROL

      When the cruise control main switch is pressed to +RES and held while the cruise control system is in operation, the driving support ECU assembly instructs the ECM to increase the injection volume and perform constant acceleration control. 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 0.6 seconds or less) 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 is 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 assembly is maintained).


      • Depressing the brake pedal

      • Pulling the cruise control main switch to CANCEL

      • Driving the vehicle while the vehicle stability control system is operating*1

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

      • Depressing the clutch pedal


      • *1: VSC

  4. AUTO CANCEL (FAIL-SAFE)

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