CRUISE CONTROL SYSTEM SYSTEM DESCRIPTION

  1. CRUISE CONTROL SYSTEM

    This system is controlled by the hybrid vehicle control ECU, and control is performed using the throttle with motor body assembly and motor drive force. The hybrid vehicle control ECU controls the following functions: ON-OFF, - (COAST)/SET, + (ACCEL)/RES (RESUME), CANCEL, vehicle speed operation.

    • The hybrid vehicle control ECU compares the vehicle speed from the speed sensor with the stored vehicle speed set using the cruise control main switch. The hybrid vehicle control ECU instructs the throttle valve motor of the throttle with motor body assembly to close the valve and the motor generator to decrease the motor drive force when the vehicle speed is greater than the stored speed, and instructs the throttle valve motor to open the valve and the motor generator to increase the motor drive force when the vehicle speed is less than the stored speed.

    • 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 command.

    • A229932C01

      *1

      Cruise Control Indicator Light

      *2

      Cruise Control SET Indicator Light

      The hybrid vehicle control ECU illuminates the combination meter assembly cruise control indicator when the cruise control system is turned on using the cruise control main switch.

    • The hybrid vehicle control ECU turns off the combination meter assembly cruise control indicator and displays a warning message when a malfunction occurs during cruise control driving.

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

    • The hybrid vehicle control ECU cancels control of vehicle speed when the brake pedal is depressed and the hybrid vehicle control ECU receives a signal from the stop light switch assembly.

    • The hybrid vehicle control ECU cancels control of vehicle speed when the shift lever is moved from D or S to any other position.

    • The hybrid vehicle control ECU cancels control of vehicle speed when the shift paddle switch assembly is used to select the 3rd, 2nd or 1st range with the shift lever in D or S.

    • The hybrid vehicle control ECU cancels control of vehicle speed when the cruise control main switch is pulled to CANCEL.

    • The hybrid vehicle control ECU cancels control of vehicle speed when the cruise control system is turned off using the cruise control main switch (ON/OFF).

  2. LIMIT CONTROL

    1. 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. Control of vehicle speed will be automatically canceled but the stored vehicle speed will be retained when the vehicle speed drops below the low speed limit while the cruise control system is controlling vehicle speed.

    2. High speed limit

      The highest possible set 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 the speed beyond the high speed limit.

  3. OPERATION OF CRUISE CONTROL

    The cruise control main switch is used to turn the cruise control system on and off, as well as operate 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 being operated in the direction of each arrow, and turns off when it is released.

    1. SET CONTROL

      The vehicle speed is stored and speed control begins when the cruise control main switch is pushed to -/SET while driving with the cruise control system on (while the cruise control indicator is illuminated), and the vehicle speed is within the set speed range (between the low and high speed limits).

    2. - (COAST) CONTROL

      When the cruise control system is controlling vehicle speed and the cruise control main switch is pushed to -/SET and held in that position, the cruise control system sends "throttle valve opening angle 0°" and "motor drive force decreasing" demand signals to the hybrid vehicle control ECU. Following this, the vehicle speed is stored and maintained when the cruise control main switch is released.

      Tip:

      An actual throttle valve opening angle of 0° is not possible due to items such as idle speed control.

    3. TAP-DOWN CONTROL

      When the cruise control system is controlling vehicle speed and the cruise control main switch is tapped to the -SET side (for approximately 0.6 seconds or less), the stored vehicle speed decreases by approximately 1 km/h (or 1 mph) for each time the switch is tapped. When the cruise control main switch is tapped to -SET and the difference between the current and stored vehicle speed is more than approximately 5 km/h (3 mph), the current vehicle speed is stored and speed control is performed.

    4. ACCELERATION CONTROL

      When the cruise control system is controlling vehicle speed and the cruise control main switch is pushed to +RES and held in that position, the cruise control system sends a signal to the hybrid vehicle control ECU to operate the throttle valve motor of the throttle with motor body assembly to open the throttle valve. Following this, the vehicle speed is stored and maintained when the cruise control main switch is released.

    5. TAP-UP CONTROL

      When the cruise control system is controlling vehicle speed and the cruise control main switch is tapped to the +RES side (for approximately 0.6 seconds or less), the stored vehicle speed increases by approximately 1 km/h (or 1 mph) for each time the switch is tapped. When the cruise control main switch is tapped to +RES and the difference between the current and stored vehicle speed is more than approximately 5 km/h (3 mph), the stored vehicle speed will not be changed.

    6. RESUME CONTROL

      If cruise control system control of vehicle speed was canceled due to any of the manual cancel conditions (other than turning the cruise control system off using the cruise control main switch), and if the vehicle speed is between the low and high speed limits, the stored vehicle speed from the time of cancellation will be resumed and maintained when the cruise control main switch is pushed to +RES.

    7. CANCEL CONTROL

      1. Manual cancel

        Performing any of the following cancels control of vehicle speed by the cruise control system (the stored vehicle speed in the hybrid vehicle control ECU is maintained).

        • Depressing the brake pedal.

        • Turning the cruise control main switch off (set speed is not stored in memory).

        • Moving the shift lever to any position except D or S (6th, 5th or 4th gear).

        • Pulling the cruise control main switch to CANCEL.

        • Turning the cruise control system off using the cruise control main switch (ON/OFF) (the stored vehicle speed in the hybrid vehicle control ECU is not maintained).

      2. Auto cancel

        Performing any of the following cancels the cruise control system (the stored vehicle speed in the hybrid vehicle control ECU is maintained).

        • Vehicle speed decreases below the low speed limit approximately 40 km/h (25 mph).

        • VSC operates while the vehicle is in motion.

        • TRC operates for certain amount of time while driving with cruise control system controlling vehicle speed.

        • TRC and VSC are off.

        Performing any of the following cancels the cruise control system (the stored vehicle speed in the hybrid vehicle control ECU is not maintained).

        • Vehicle speed decreases by 16 km/h (10 mph) or more below the speed at which the cruise control is set.

  4. AUTO CANCEL (FAIL-SAFE)

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

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