The Control Strategy Of Active Braking System For Electric Vehicle

The continuous development of science and technology has brought a lot of convenience and led to many problems at the same time.For example,in the automotive industry,the rapid development of automotive technology has led to a significant increase vehicles.Almost all of the people have the ability to own a car,but at the same time it brings many problems: First,the fuel consumption of traditional cars has increased,resulting in a crisis of oil energy in the long run;Second the increasing of vehicles has caused more and more complex driving environment and led to many problems about driving;Thirdly,the exhaust emissions of a large number of conventional cars lead to serious environmental pollution problems.To solve the above problems,countries around the world are developing and researching new energy vehicles,including electric vehicles,to solve the oil energy crisis and the pollution of traditional vehicle exhaust emissions.At the same time in order to improve the safety of vehicles in a complex traffic environment,since the last century,research on the active safety of vehicles has begun.Especially in the recent decades,with the continuous development of automotive electronics,the active safety technology of vehicles has also developed rapidly.Although the development of active safety technology is fast,it is not very mature and needs further research and improvement.This article takes a four-wheel drive electric vehicle as the research object and studies its active electromechanical compound brake control strategy.Active braking: the vehicle will automatically brake to ensure the safety of the driver and other people in the car when the driver take false operation in dangerous situation or the driver did not take appropriate braking measures in time.Electromechanical compound braking is the problem of rational distribution of electric brakes and mechanical brakes according to different working conditions.Because it has the advantages of good dynamics,low emissions,and high efficiency.However,this article does not consider the issue of regenerative braking energy recovery efficiency,mainly consider the problem of control strategy to improve the adhesion and utilization rate of the road surface and the problem of increasing the calculation efficiency of the braking force distribution time.The article starts with the vehicle's safety distance model,vehicle dynamics,and electromechanical braking strategies,combining the safety distance model studied by previous researchers with the braking control strategy studied in this paper,the active braking control strategy of this paper is formed.Safety distance models studied by previous generations fuse together and formed a safe distance model with safe driver factors,the combination of this safety distance model and the control strategy of this article effectively improves the braking safety of vehicles.The paper comes up with an improved electromechanical composite control strategy based on the I curve braking force distribution control method.The improved brake control strategy can make the vehicle use the pavement adhesion coefficient better in the braking process and increase the efficiency of braking force distribution calculation to achieve the effective safety during braking.Finally,this paper simulates the simulation platform of this experiment by combining advisor,Car Sim and Matlab/Simulink to simulate the active electromechanical composite braking control strategy by extracting the speed of the vehicle in different conditions in the advisor and combining the vehicle dynamics model in Car Sim and writing the controller in Matlab/Simulink.The simulation results show that the active electromechanical compound brake control system can satisfy the braking performance of the vehicle under different roads and different driving conditions,and has a good effect of emergency braking and effective reliability during braking,improves safety and better adaptability during vehicle braking.