Introduces a kind of designing scheme of the automobile col ision warning system based on 51 single chip microcomputer design.With the laser ranging sensor and ultrasonic ranging sensors,this systerm monitoring and displaying the distance between the car and the obstacle,respectively in the car's forward and reverse working state.When the distance reaches the safety limit,sound and light wil alarm,to remind the driver of a transformation of the driving route.If the driver doesn't perform any operation after a time,then the system wil make the brake system brake the car on its own in order to avoid col ision.% 本文介绍了一种基于51单片机的汽车防碰撞报警系统的设计方案。在汽车前进时采用激光测距传感器、在倒车时采用超声波测距传感器对汽车与障碍物的距离进行实时监控，并动态显示距离的数值。当距离达到设定的安全门限时，进行声光报警，提醒驾驶员及时变换行驶路线。如在设定的时间内驾驶员未执行任何操作，则执行单元使制动系统主动制动，使汽车避免和障碍物发生碰撞。
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