CRUISE CONTROL SYSTEM > SYSTEM DESCRIPTION

for Preparation Click here



CRUISE CONTROL SYSTEM
This system is controlled by the hybrid vehicle control ECU, and is activated by the throttle position sensor and motor. The hybrid vehicle control ECU controls the following functions: ON-OFF, -/SET, +/RES, CANCEL, vehicle speed operation, motor output control, and overdrive control.
  1. The hybrid vehicle control ECU compares the driving vehicle speed from the speed sensor with the stored vehicle speed set through the cruise control main switch assy. The hybrid vehicle control ECU controls the throttle valve motor of the throttle position sensor and motor to close the valve when the driving speed is less than the stored speed.
  2. The hybrid vehicle control ECU receives signals such as ON-OFF, -/SET, +/RES, and CANCEL from the cruise control main switch assy and executes them.
  3. The hybrid vehicle control ECU illuminates the combination meter's CRUISE main indicator light when it receives the cruise control main switch ON signal.
  4. The hybrid vehicle control ECU cancels the cruise control system when the brake pedal is depressed and the hybrid vehicle control ECU receives the stop light switch signal.
  5. The hybrid vehicle control ECU cancels the cruise control system when the shift lever is moved from D to N, and the hybrid vehicle control ECU receives the PNP switch signal.

LIMIT CONTROL

  1. Low speed limit
    The lowest possible 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. Cruise control operation will be automatically canceled.

  2. High speed limit
    The highest possible 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.


OPERATION OF CRUISE CONTROL
The cruise control main switch operates 7 functions: SET, COAST, TAP-DOWN, RESUME, ACCEL, TAP-UP, and CANCEL. The SET, TAP-DOWN and COAST functions, and the RESUME, TAP-UP and ACCEL functions are operated with the same switch. The cruise control main switch assy is an automatic return type switch which turns on only while operating it in each arrow direction and turns off after releasing it.

  1. SET CONTROL
    Vehicle speed is stored and constant speed control is maintained when pushing the switch to -/SET while driving with the cruise control 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).

  2. COAST CONTROL
    When the cruise control main switch is set to -/SET and held in that position while the cruise control system is operating, the hybrid vehicle control ECU sends a "throttle valve opening angle 0°" demand signal to the cruise control system. Then the vehicle speed, when the cruise control main switch is released, is stored and maintained.

    HINT:
    An actual throttle valve opening angle of 0° is not possible due to the idle speed control, etc.

  3. TAP-DOWN CONTROL
    When tapping down the cruise control main switch to -/SET (for approximately 0.5 second) while the cruise control system is in operation, the stored vehicle speed decreases each time by approximately 1.6 km/h (1.0 mph). When the cruise control main switch is released from -/SET and the difference between the driving and stored vehicle speed is more than 5 km/h (3 mph), the vehicle speed is stored and constant speed control is maintained.

  4. ACCELERATION CONTROL
    The throttle valve motor of the throttle position sensor and motor is instructed by the hybrid vehicle control ECU to open the throttle valve 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, the vehicle speed is stored and the vehicle is controlled at a constant speed.

  5. TAP-UP CONTROL
    When tapping up the cruise control main switch to +/RES (for approximately 0.5 second) 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 5 km/h (approximately 3.1 mph), the stored vehicle speed will not be changed.

  6. RESUME CONTROL
    If cruise control operation was canceled with the stop light switch or the CANCEL switch, and if driving speed is within the limit range, pushing the cruise control main switch to +/RES restores vehicle speed memorized at the time of cancellation, and maintains constant speed control.

  7. MANUAL CANCEL CONTROL
    Performing any of the following cancels the cruise control system while in operation (the stored vehicle speed in the hybrid vehicle control ECU is maintained).

    1. Depressing the brake pedal
    2. Moving the shift lever to any position except D
    3. Pushing the cruise control main switch to CANCEL
    4. Turning the cruise control main switch OFF (the stored vehicle speed in the hybrid vehicle control ECU is not maintained).


AUTO CANCEL (FAIL-SAFE)
This system has an automatic cancellation function (fail-safe) (Click here).