Research And Optimization Of Brake Energy Recovery System For Pure Electric College Formula Car

Entering the 21 st century,the problems of energy exhaustion and environmental pollution have posed severe challenges for the development of the automobile industry.The research and development of electric vehicles have not solved these problems.The College Student Formula Competition(FSEC)is a competition for international college students.In 2013,it was introduced to China after the National Formula Student Tank Race to provide a platform for university students to learn about pure electric and new energy vehicles.As an important energy-saving technology of pure electric vehicles,braking energy recovery system can partially convert the heat lost due to the braking process into electric energy and improve the recharge mileage of the vehicle.Racing can increase the mileage of the car to achieve better results in the efficiency test.Therefore,the application of braking energy recovery system in racing has strong practical significance.In this thesis,pure electric racing brake energy recovery system mainly carried out the following work:Firstly,the working principle and classic structure of the braking energy recovery system are briefly described.The performance and operating characteristics of the most important motors and batteries of the braking energy recovery system are analyzed.At the same time,several key factors that affect the efficiency of braking energy recovery are analyzed to do the foundation for the later optimization analysis.Then,the traditional braking dynamics is analyzed and several classic braking energy recovery strategies are proposed.By comparison,a control strategy of braking energy recovery system with rear axle hydropower system in parallel is proposed to realize hydraulic braking force and electricity braking force coupling work.AMESim is used to model the key components of the vehicle to build a vehicle braking energy recovery system simulation platform.Simultaneously,based on the previously proposed control strategy,the corresponding control strategy algorithm model is built in Matlab / Simulink,to achieve AMESim-Simulink co-simulation.Finally,the simulation parameters of the key components of the vehicle are set and the corresponding assessment standards of braking energy recovery work are formulated.The simulation is performed according to the specified working conditions and the simulation results are analyzed.Finally,the mathematical model of optimizing the charge-discharge efficiency of the motor is established.optimization theory is used to optimize the efficiency,optimize the corresponding power battery charging power,in order to achieve maximum braking energy recovery efficiency.