Research Onanti-slip Regulation Of In-wheel Motor Driven Electric Vehicle

Recently,Electric Vehicles becomean important issue worldwide mainly to solveenvironmental and energy problems caused by the use of internal combustion enginevehicles.Anti-Slip Regulation technology of EV plays an important role in improvingvehicle safety,handling stability and driving acelleration performance.Therefore,research on the ASR of EVs has important significance.This paper, based on the project supported by the natural science foundation ofHubei Province “A new generation of In-wheel Motor DrivenElectric Vehicle”,analyzed the working principle of the ASR,gave the control theory of permanentmagnet brushless dc motor and introduced several kinds ofcontrol methods used inthe modern control system.And it provided a theoreticalreference for the drivingtorque control of the In-wheel Motor DrivenElectric Vehicle.With the analysis of the characteristics of the motor, this paper designed a skiddetector depending on the motor torque,established a slip-ratio estimator based on theacceleration signal.The experimental results confirmed that we can estimate thevehicle speed based on the acceleration signal.Through the in-depthanalysis of theroad recognition theory,this paper designed a road adhesion coefficient estimationalgorithm.This paper compares the ASR strategies at home and abroad, then the ModelFollowing Control (MFC) and Optimal Slip-ratio Control algorithms wereanalyzed,compared and optimized.A new fuzzy control method based on the estimation of theslip-ratio was designed, and it makes the ASR of the in-wheel motor driven EV muchmore precisely and practically.Matlab software was used to establish the vehicle model, motor model, tiremodel, ASR controller and Sliding observer. The anti-slip control algorithm issimulated;the simulation results show that all of the control algorithms can quicklyand effectively suppress the wheel slip under closed-loop control. Through theresearch of the parameters in every control method, the control algorithmoptimization method was presented.The motor torque can be measured and controlled accurately; Anti-SlipRegulation based on the slip observation will get a better application in the future.