倒车防撞报警系统的设计

The Design of Car Reversing Anti-Collision Warning System

基于超声波测距原理,介绍了一种以单片机AT89C51为主控制器的倒车防撞报警系统。此系统在汽车倒车时自动启动,由装置于车尾保险杠上的探头发送超声波,遇到障碍物产生回波信号,传感器接收到回波信号后经控制器进行数据处理,判断出障碍物的位置,达到设定的距离时显示并播报。为了减小测距的误差在数据处理部分还采用了温度补偿和最小二乘法来修正距离。实验表明该倒车系统在30 cm^500 cm范围内可实现准确测距,具有可靠性较高、外围电路简单、实用性强等优点。

Based on the principle of ultrasonic ranging,this paper introduces a kind of reverse collision warning system with the AT89C51 single chip as the core of control.The systemis started automatically under the control of the controller,when the car is reversing.Probe installed in the rear bumper sends out ultrasonic.When it encounters obstacle,an echo signal is generated.The controller processes the echo signal to determine the location of obstructions,so that this system alarms when it reaches the set distance.Temperature compensation and the least square method are also used to amend the distance in data processing to decrease the inaccuracy.Experiments show that the measured data is accurate within 30 cm^500 cm.The automobile reversing radar system has high reliability,simple peripheral circuit,practical for use,and so on.