CRUISE CONTROL SYSTEM SYSTEM DESCRIPTION


  1. GENERAL

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


    • The hybrid vehicle control ECU assembly compares the vehicle speed from the speed sensor with the stored vehicle speed set using the steering pad switch assembly. The hybrid vehicle control ECU assembly instructs the throttle valve motor of the throttle body with motor 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 assembly assembly receives signals from the steering pad switch assembly indicating when the cruise control main switch, - (COAST)/SET switch, + (ACCEL)/RES (RESUME) switch, CANCEL switch, etc., is pushed.

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

    • B000OLXC52
      *a Cruise Control Indicator
      *b Cruise Control SET Indicator

      The hybrid vehicle control ECU assembly 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.

  2. FUNCTION OF MAIN COMPONENTS


    1. The main components of the cruise control system have the following functions:

      Component Function
      Steering Pad Switch Assembly Cruise Control Main Switch Turns the cruise control system on and off.
      CANCEL Switch Outputs a cancel signal to the hybrid vehicle control ECU assembly.
      +RES Switch Outputs acceleration and resume stored speed signals to the hybrid vehicle control ECU assembly.
      -SET Switch Outputs deceleration and set vehicle speed signals to the hybrid vehicle control ECU assembly.
      Skid Control ECU Assembly

      • Sends VSC operation signals to the hybrid vehicle control ECU assembly.

      • Sends TRC operation signals to the hybrid vehicle control ECU assembly.

      • Sends signals such as wheel speed and estimated vehicle acceleration signals to the hybrid vehicle control ECU assembly.
      Hybrid Vehicle Control ECU Assembly Controls all functions of the cruise control system in accordance with the signals received from switches, sensors and ECUs.
      Combination Meter Assembly Cruise Control Indicator

      • Illuminates based on signals from the hybrid vehicle control ECU assembly when the cruise control system is turned on using the cruise control main switch.

      • Turns off based on signals from the hybrid vehicle control ECU assembly when a malfunction is detected in the cruise control system.
      Cruise Control SET Indicator Illuminates when the vehicle speed is set.
      Multi-information Display

      • Displays warning messages to alert the driver.

      • Displays the current set speed.
      Throttle Body Assembly Throttle Control Motor Adjusts the throttle valve opening angle in accordance with signals received from the hybrid vehicle control ECU assembly.
      Throttle Position Sensor Outputs the throttle valve opening angle to the hybrid vehicle control ECU assembly.
      Speed Sensor Outputs wheel speed signals to the skid control ECU assembly.
      Accelerator Pedal Sensor Assembly Outputs accelerator pedal depression angle to the hybrid vehicle control ECU assembly.
      VSC OFF Switch (No. 2 Combination Switch Assembly) Outputs VSC off signals to the skid control ECU assembly.
      Shift Control ECU Outputs the shift state signals to the hybrid vehicle control ECU assembly.
      Stop Light Switch Assembly Outputs brake pedal depressed signals to the hybrid vehicle control ECU assembly.

  3. OPERATION OF CRUISE CONTROL


    1. The cruise control system has the following control functions:

      Function Outline
      Constant Speed Control The hybrid vehicle control ECU assembly compares the actual vehicle speed and the set speed and if the vehicle speed is less than the set speed, it uses the throttle control motor to increase the throttle valve opening angle.
      Set Control The vehicle speed is stored and speed control is performed when the -SET switch is pushed while driving with the cruise control system on and the vehicle speed is within the set speed range. The current set speed is displayed on the multi-information display when the +RES switch or -SET switch is pushed.
      Low Speed Limit Control The low speed limit is the lowest speed that cruise control can be set at and it is designed to be approximately 40 km/h (25 mph). The cruise control system cannot be set below that speed. If the vehicle speed drops below that speed while the cruise control is operating, speed control by the cruise control system will be canceled automatically. However, the set speed is kept in memory.
      - (COAST) Control When the cruise control system is controlling vehicle speed and the -SET switch is pushed and held, the cruise control system sends a "throttle valve opening angle 0°" demand signal to the hybrid vehicle control ECU assembly. Following this, the vehicle speed is stored and maintained when the -SET switch is released.
      Tap-down Control When the cruise control system is controlling vehicle speed and the -SET switch is tapped (for approximately 0.6 seconds), the stored vehicle speed decreases by approximately 1 km/h or 1 mph for each time the switch is tapped. When the -SET switch is tapped and the difference between the current and stored vehicle speed is more than 5 km/h (3 mph), the current vehicle speed is stored and speed control is performed.
      + (ACCEL) Control When the cruise control system is controlling vehicle speed and the +RES switch is pushed and held, the cruise control system sends a signal to the hybrid vehicle control ECU assembly to operate the throttle valve motor of the throttle body with motor assembly to open the throttle valve. Following this, the vehicle speed is stored and maintained when the +RES switch is released.
      Tap-up Control When the cruise control system is controlling vehicle speed and the +RES switch is tapped (for approximately 0.6 seconds), the stored vehicle speed increases by approximately 1 km/h or 1 mph for each time the switch is tapped. When the +RES switch is tapped and the difference between the current and stored vehicle speed is more than 5 km/h (3 mph), the stored vehicle speed will not be changed.
      RES (Resume) Control If control of vehicle speed by the cruise control system 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 approximately 40 km/h (25 mph) or more, the stored vehicle speed from the time of cancellation will be resumed and maintained when the +RES switch is pushed.
      Manual Cancel Control

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


      • Depressing the brake pedal.

      • Moving the shift position from D to any other position.

      • Pushing the CANCEL switch.

      • Turning the cruise control system off using the cruise control main switch (the stored vehicle speed in the ECM is not maintained).
      Automatic Cancel Control

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

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