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Chapter 6 Adaptive Cruise Control (ACC)

Chapter 6 Adaptive Cruise Control (ACC). Introduction to ACC.

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Chapter 6 Adaptive Cruise Control (ACC)

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  1. Chapter 6Adaptive Cruise Control (ACC)

  2. Introduction to ACC Adaptive Cruise Control (ACC) technology automatically adjust the vehicle speed and distance to that of a target vehicle. ACC uses a long range radar sensor to detect a target vehicle up to 200 meters in front and automatically adjusts the ACC vehicle speed and gap accordingly. ACC automatically decelerates or accelerates the vehicle according to the desired speed and distance settings established by the driver. As per standard cruise control the driver can override the system at any time.

  3. Common Terms in ACC • Response time of the driver (t): time needed by the driver to response safely to any unwanted disturbances (approximately about 2-3 sec) • Safe distance: the distance between vehicle equipped with ACC to the leading vehicle in front where the driver is still able to response safely in case of emergency brake happened to the vehicle in front Safe distance = Vs * t Vs = speed of ACC vehicle t = 2-3 sec

  4. How ACC works?

  5. System Configuration of ACC

  6. ACC Control • Model free control (no equations of motion of the model needed) 2. Model based control (controller is developed based on vehicle system model)

  7. Flow chart of ACC Programming (Model free)

  8. System Description of ACC

  9. Model based ACC control

  10. Engine model

  11. Torque Converter Model

  12. Transmission Model

  13. Vehicle Dynamics Model

  14. Develop Simulink Diagram of Model Based ACC Controller 30 minutes

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