本文介绍了一种利用AT89S52单片机为控制核心，结合多种传感器实现循迹、避障、红外遥控、控速、灭火功能的智能小车。利用BFD-1000传感器检测赛道实现小车循迹，利用两个红外传感器检测道路上的障碍，控制电动小汽车的自动避障，整个系统具有自动寻迹、避障和红外遥控、控速等测试功能。其中，控制部分采用AT89S52，AT89S52是一款8位单片机，它的易用性和多功能性受到了广大使用者的好评。电机驱动采用常用的PWM方式进行电机的调速控制。整个系统的电路结构较简单，可靠性能高，能满足各种设计的要求。随着我国高科技水平的不断提高和工业自动化进程的不断推进，智能小车被广泛应用于各种玩具和其他产品的设计中，极大地丰富了人们的生活。-This paper introduces a kind of using AT89S52 single chip microcomputer as control core, combined with a variety of sensors tracking and obstacle avoidance, infrared remote control, speed control, fire extinguishing function of smart car. BFD- 1000 sensor detection circuit to realize the vehicle tracking, using the two infrared sensor detection in the way, the control electric car automatic obstacle avoidance, the whole system with automatic tracing, obstacle avoidance and the infrared remote control, the speed test function. Among them, the control part adopts the AT89S52, AT89S52 is an 8-bit microcontroller, its ease of use and versatility has been well received by the majority of users. Motor driver USES the common way of PWM motor speed control. The circuit structure of the whole system is simple, reliable performance is high, can meet the requirements of various design. With the continuous improvement of our country high-tech level and the advancement of industrial process automat