Design Of Braking Energy Recovery System For Hub Driven Electric Vehicle

With the continuous improvement of people's living standards,automobile sales growththe energy consumption and air pollution caused widespread concern.How to save energy and reduce exhaust emission has become an important issue to be solved urgently.Electric vehicle uses a battery to replace oil as a power source,can directly reduce the consumption of non renewable resources,and reduce vehicle exhaust emissions fundamentally,thus become a research hotspot in the field of automotive technology.However,compared with the conventional fuel vehicles,the current electric vehicle battery mileage is relatively short,can not meet the needs of consumers,become the biggest obstacle in the process of electric vehicle promotion.Therefore,it is of great significance to study the technology of improving the driving range of electric vehicles.Regenerative braking technology can recover some of the mechanical energy consumed when the vehicle is braking,convert it into electrical energy and store it in the battery,which can effectively improve the energy utilization rate and extend the driving range of electric vehicles.Based on the National Natural Science Foundation of China.Research on Vertical Electromechanical-coupling Vibration Mechanism and Its Suppression Method of Electric Vehicle Driven by in-wheel Motor(Grant No.51575001)is supported.The main research work is as follows:1.The dynamic model of the longitudinal vehicle is established,and the dynamics of the electric vehicle is analyzed.2.Based on analyzing the road attachment condition,the battery charge and discharge characteristics and the characteristics of the motor vehicle,with the ECE R13 braking regulations,making the electric vehicle braking force distribution strategy and braking force distribution of electric vehicles close to the ideal brake curve.3.Based on the genetic algorithm toolbox,the least squares method is used to optimize the braking force distribution coefficient of electric vehicles.4.The regenerative braking test platform is built,and the software is programmed in Lab VIEW to verify the electric vehicle braking force distribution strategy;5.A battery monitoring device for electric vehicle is designed to protect the battery and improve the braking efficiency.At the end of this paper,the research work is summarized and prospected.