Research On Adptive Cruise Control System Based On Wire Control Execution Platform

The intelligent networked car brings a smarter,comfortable and safe driving experience to the driver,and changes people's perception of the car and improves the travel efficiency,which is the trend of automobile development.The development of intelligent networked vehicles has made the high-precision and fast-responding chassis execution system the key basis for the decision-making of automatic driving,which determines the operability and safety of the smart car.The chassis execution system responds to upper-level decisions,primarily to achieve automatic steering,automatic braking,and automatic drive.Therefore,this paper firstly developed a line-controlled chassis execution platform based on the needs of intelligent development trends,which are mainly divided into line control system,line control steering system and line control drive system.The adaptive cruise control system is currently the preferred function of intelligent driving.It can solve traffic congestion or traffic accidents caused by driver misoperation or fatigue driving during high-speed driving.At the same time,it can realize automatic follow-up when driving at low speed under urban conditions.Drive at a certain safe distance and safe speed to ensure driving safety.Therefore,based on the developed line-controlled site execution platform,the adaptive cruise control system control strategy was developed,which mainly studied the control strategies of low-speed driving and high-speed driving.In this paper,the car line control chassis algorithm is developed,which can achieve the target acceleration calculated by the upper decision,the target deceleration and the target steering angle,and execute accurately.On the one hand,the feasibility of the designed platform was verified by the simulation software.On the other hand,the stability of the wire-controlled undercarriage system was verified by modifying the vehicle and conducting a real vehicle test.Tests have shown that this platform can respond quickly to target instructions and can execute commands accurately.Based on this line-controlled chassis execution platform,this paper studies the strategy of the adaptive cruise control system under different speeds,and develops a layered control strategy.The upper layer studies the high-speed mode and the safety mode respectively,according to the speed of the vehicle.The acceleration and the target vehicle's relative speed,relative distance and other information are calculated to obtain the target acceleration or the target deceleration;the lower controller is the line-controlled chassis execution platform,corresponding to acceleration or deceleration.The design control strategy is written as C language code,and it is burned to the controller on the modified line control vehicle.The test results are similar to the simulation results,which proves the feasibility and safety of the designed control strategy.