Research And Implement Of Regenerative Braking And Driving System Based On Pure Electric Vehicles

Pure electric vehicles can achieve zero emissions to protect the environment andpromote sustainable community development strategy. Our country is one of thecountries of the energy shortage, and the use of pure electric vehicles can reduce itsdependence on oil and other energy. Regenerative braking of pure electric vehiclecan recover the inertia energy to the battery when the vehicle is moving .It canachieve the recycling of energy when braking, to improve the energy utilization andprolong automobile sequels drive ability. Based on these, the topic mainly researchesregenerative braking strategies and its realization methods are researched in thisthesis. And the PMSM controller integrating driving control and regenerativebraking control based on FPGA is designed.Firstly, the braking dynamics model of the electric vehicles is established toobtain the working conditions and constraint conditions of regenerative braking.Then three control strategies of vehicle regenerative braking are proposed, As thedriving core, the permeanent magnet synchronous motor is analysis on motormathematic models and control methods.Secondly, the hardware circuit design of regenerative braking for electricvehicles is completed. In this thesis, power circuit structure, power driver circuit,digital encoder sample circuit, voltage and current detecting circuit, control systempower supply design and the protection circuit design are also proposed to obtain thehardware basis of EV regeneration braking..Thirdly, the implementation scheme of electric vehicle regenerative brakingbased on FPGA is designed. In this scheme, driving control module and regenerativebraking control module for PMSM are researched and implemented, and PMSMcontroller based on vector control is realized.Finally, based on EV experimental platform, experiments of regenerativebraking under different traffic and different conditions are completed. And, theexperimental results validate the regenerative braking controller designed in thesis isfeasible and reliable.