The Control Strategy Study On In-wheel Motor Driving System And Braking-energy Recovery Of Electric Vehicle

With the arrival of the energy crisis and the improvement of environmental protectionconsciousness of people, the electric once again become a development focus on new typeof vehicle. Electric cars with the drive of In-wheel Motor have more obvious advantagethan the traditional electric cars: it simplifies transmission chain, saved the chassis spaceand improving the efficiency. It realizes the integration of the drive motor and the drivewheels, improving the dynamic performance of the vehicle. The electronic differentialcontrol enhances the car handling stability and flexibility.In order to comprehensively improve the electric car energy utilization ratio, thispaper takes the control strategy of the in-wheel motor drive system and the braking energyrecovery system as the research object, and established in-wheel motor drive systemsimulation model and used two times developed advisor to analysis the dynamicperformance and the car recycle state under different working conditions. Finally the paperprovided the control strategy of in-wheel motor drive driving system and braking energyrecovery system.Motor and the control system is the research core in-wheel motor drive electricvehicle, through comparative analysis of several common drive motor, from motorefficiency, control difficult to manufacturing cost, this article takes the permanent brushlessDC motor as the in-wheel drive motor. After the analysis on the permanent brushless DCmotor theory, we established simulation model, using matlab/simulink software, accordingto the physical control system model.Through the comparative analysis with differentcontrol methods finally this article formulated fuzzy PID control strategy about the electriccar driving motor.In order to realize the electric vehicle braking energy recovery, on the basis of theoryanalysis on the electric vehicle braking energy recovery principle, this paper applied thesecond developed advisor software to establish the pure electric vehicle in-wheel motordriven simulation model. Ensuring braking efficiency and braking stability, this paperdesigned braking power distribution strategy based on the brake regulations ECE.According to the simulation results of typical road driving cycles, braking control strategymade in this paper can have not only meet the car dynamic stability requirement, but alsohas high efficient energy recovery ability.