Steering Brake Control And Energy Recovery Of Electric Vehicles With Four Wheel Independent Drive

As the world enters the wave of rapid economic progress in the 21 st century,people produce a large number of industrial products to meet the growing material demand,which leads to the increasingly serious problem of air pollution,global warming and other environmental issues get social attention.Among them,experts and scholars point out that while automobiles bring people convenient travel,automobile exhaust emissions seriously damage the air quality,causing global temperature rise and other problems.In this context,electric vehicles become the mainstream direction of the future development of the automotive industry.In this paper,the yaw stability of a four-wheel independent drive electric vehicle in the process of turning and braking is studied,and the braking force distribution controller is designed.Firstly,the four-wheel independent drive electric vehicle dynamics analysis,the establishment of seven degrees of freedom vehicle model and the wheel,motor,hydraulic braking model required in the following paper.Based on the CarSim simulation software,the influence of different braking force allocation strategies on vehicle stability and operability is analyzed,and the influence of different composite braking force allocation strategies on vehicle energy efficiency is also analyzed for the specific energy recovery performance of electric vehicles.Secondly,the longitudinal speed sensor based on vehicle acceleration sensor and wheel speed sensor is designed by introducing kalman filter theory,and the fuzzy observer for road condition recognition is designed according to the fuzzy logic control theory.It overcomes the problems such as the difficulty in accurately displaying the speed of the vehicle and the difficulty in identifying the road condition in the process of driving.Finally,the yaw torque controller based on multi-agent theory is designed through the analysis of the four-wheel independently driven electric vehicle under the turning braking condition,and the braking torque distribution of the four wheels is calculated.Through the analysis of four-wheel independent drive electric vehicle in turning stability under emergency braking,puts forward the lower hydraulic brake compensation strategy of composite braking in extreme conditions,vehicle safety and energy efficiency increased significantly,with the combination of Simulink simulation environment by constructing Carsim,on the move U curve and double line to verify the feasibility and effectiveness of the proposed algorithm in this paper.