Research And Design Of Car Distance Measurement And Speed Measurement And Reversing Prompt System

Nowadays,the number of automobiles is increasing day by day,people in daily life are more and more back-up parking,therefore,when the back-up parking,people on the back-up parking system security and convenience requirements are gradually increasing.Based on the research background of realizing the safety and convenience of car reversing parking,this paper designs a reversing radar system based on ultrasonic ranging,which can measure the distance of car reversing and display,display its position at the same time,and combine it with the alarm system to increase the driver's safety in reversing parking.And convenience as the core of the design.In this study,AT89S52 single chip microcomputer is used as the main controller.According to the theory of ultrasonic ranging and photoelectric encoder speed measurement,the speed of the car and the reverse speed prompt circuit is designed,and the corresponding speed measurement program is included.The main research contents of the system include the following points:(1)The present situation and development of automotive ranging,speed measuring and backing warning system at home and abroad are analyzed,and the overall design framework of automotive ranging,speed measuring and backing warning circuit is put forward based on the theory at home and abroad.In addition,the circuit structure,pin function and working principle of the single-chip microcomputer used in this system are proposed.(2)Study the circuit structure of the system,study the function and working principle of AT89S52,design the speed control and commutation control of the analog circuit based on AT89S52.The main control module of the system is designed.(3)The applicability of CX20106A chip used in the system designed by this research institute is summarized,and the ultrasonic ranging module is designed by using the theory of ultrasonic ranging circuit.A comprehensive comparative analysis is made of the convenience and cost performance of the CX20106A chip adopted by the device.In addition,an overall research method of ultrasonic ranging device based on the theory of ultrasonic ranging is proposed.(4)The principle of measuring speed of photoelectric encoder is introduced,and the design scheme of measuring speed of photoelectric encoder is proposed.(5)The circuit function is debugged by transmitting and receiving circuit,ranging function test,temperature effect test and speed function test.The system meets the design requirements and runs stably.