On The Adaptive Cruise Control System For Electric Vehicle

With the sharp growth in the vehicle ownership,energy crisis and traffic safety problem have become increasingly prominent.New energy vehicle’s development and advanced automotive safety technologies caused widespread attention from all walks of life.The study on vehicle adaptive cruise system has been developing rapidly and got some achievements,however,there are still many problems need to be further researched and discussed.In order to improve the safety of the vehicles,a four-in-wheel-motor-drive electric vehicle is taken into account in this paper.The adaptive cruise control system are further researched on safety distance model,vehicle dynamics modeling and the design of adaptive cruise control system’s hierarchical controllers.The main research contents are as follows:(1)The overall design of the adaptive cruise control system for electric vehicles is analyzed,and the starting conditions and control effects of the three control modes are analyzed.The key issues that need to be solved in the system are proposed.(2)A safety distance model has been taken by the typical braking process.According to the actual data,the range of its parameter variables is estimated.(3)The upper controller is built according to fuzzy control theory,piecewise function control theory and optimal control theory in Simulink.The lower controller is designed by PID control theory,and a braking force distribution strategy is combined to provide a theoretical basis for braking force distribution.(4)The simplified model of permanent magnet synchronous motor was adopted,and the transmission system and the vehicle dynamic model of electric vehicle were built in CarSim2016 and Simulink.Finally,the work of the full text is summarized,and further works are discussed.