"智能小车运动控制技术研究：基于超声波传感器与单片机的自动避障系统"

Intelligent Car Motion Control Technology research is a significant topic in the field of Computer Science and Technology. This research paper, completed by a student from the Xinke College of Henan University of Science and Technology in 2012, focuses on implementing a smart car system that utilizes an STC89C52 single chip microcontroller as the control core. The system uses ultrasonic sensors to detect obstacles on the road, transmitting the data to the microcontroller. When an obstacle is detected within 20cm in front of the car, the microcontroller sends instructions for the car to turn left at a certain angle and then stop to continue detecting obstacles. If no obstacles are detected within 20cm, the car continues straight; otherwise, it continues turning left at a certain angle. This continuous cycle of ultrasonic detection allows the car to autonomously avoid obstacles. The system also utilizes an L298 driver to control four DC motors that drive the car, with PWM system used to regulate the car's speed. The keywords for this research include STC89C52, PWM speed control, electric car, and ultrasonic technology. This research paper contributes to the development of intelligent car technology and showcases the practical application of advanced control systems in autonomous vehicles.