Research On Longitudinal Collision Warning And Automatic Emergency Brake Controller Of Electric Vehicle

Great changes have taken place recently in the automobile industry,and various countries in the world are constantly encouraging the promotion and application of new energy vehicles.In response to the environmental pollution and energy crisis,the world's major auto powers have even proposed a total ban on fuel vehicles in the future,which directly caused the car companies to race to do research on the new energy vehicles.Among them,the safety technology of electric vehicle(EV)and Advanced Driver Assistance System(ADAS)have become a hot spot in recent years.This article comes from National Key Research and Development Plan"Research and Product Development of Key Technologies for Advanced Driver Assistance System of Electric Vehicle".With the Pure electric vehicle as the object of the research,the controller for collision warning and automatic emergency brake was designed and developed successfully.On the basis of introducing ADAS system,this paper analysed the functional requirements of control system for collision warning and automatic emergency brake,and designed its overall framework.In terms of the hardware circuit,this paper designed the minimum system circuit,CAN communication circuit and other peripheral circuit,and also completed the design of PCB by Altium Designer with Infineon TC1782,then,the hardware circuit board was also well debugged.In terms of the software,a safe distance model based on the braking process analysis was established for the control strategy.In addition,this paper has designed the upper and lower controller with the hierarchical control structure.According to the "V" development mode of electric control unit,the control strategy program automatically generated by RTW was integrated with the bottom drive program developed by DAvE,the development of system control program was successfully completed after variables was exchanged and the main program was unitized.The longitudinal dynamic model and the inverse longitudinal dynamics model of electric vehicle including motor,battery and brake was also built.Combined with control strategy,the off-line simulation platform of the controller was set up in Simulink.According to the functions of the controller,the simulation test was performed after setting the corresponding working conditions.The results show that the developed control strategy can realize the expected function well.A hardware-in-loop simulation platform based on dSPACE was also built for simulation of real vehicle test under condition of NEDC cycle,the hardware-in-loop simulation results show that the developed controller is not only reliable,but also can successfully complete the expected functional requirements.