1. Introduction
an adaptive cruise control system is an intelligent automatic control system, which is based on a cruise control technology already exists on the evolved. In the traveling of the vehicle, mounted on a vehicle from the front portion of the vehicle sensor (radar) continuously scans the road ahead of the vehicle, while the vehicle wheel speed sensor signal acquisition. When over the distance between the vehicle in front hours, the ACC operation may be coordinated by the control unit and the anti-lock braking system, an engine control system, so that the appropriate wheel brake, and the engine output power lowered to the vehicle and the preceding vehicle always keep a safe distance. Adaptive cruise control system when the vehicle brake control, braking deceleration limit will usually not affect the degree of comfort, when a larger deceleration, the ACC control unit will be audible signals inform the driver to take the active system moving operation. When the distance between the vehicle in front increases to a safe distance, ACC control unit controls the vehicle in accordance with the set speed.
2, action:
(1) by the vehicle from the sensor feedback signal, the ACC control unit may be a vehicle body according close the moving speed determining road conditions, and to control the state of the vehicle; accelerator pedal feedback by sensing a force applied to the driver on the pedal, the ACC control unit may decide whether to perform a cruise control, in order to reduce driver fatigue.
(2) adaptive cruise control system is generally greater than the vehicle speed 25 km / will work h, the vehicle speed decreases when the 25 km / h or less, the driver needs to be manually controlled. By upgrading system software, adaptive cruise control system can achieve the “stop / start” function, in response to frequent when driving in urban stop and start situation. This extension of the adaptive cruise control system, the automobile can be maintained with the vehicle in front a set distance at a very low speed. After starting the preceding vehicle, the adaptive cruise control system will alert the driver, by a driver pressing a button or step on the gas pedal signals, the vehicle can start running.
(3) an adaptive cruise control system makes the vehicle travel more easily formation. The ACC control unit may set the automatic tracking of the vehicle, when the vehicle follows the vehicle in front, the ACC control unit may adjust the vehicle speed to the vehicle in front of the same, while keeping the distance between vehicles, and this distance may be close to the steering wheel by controlling the rod is provided to select.