Research On Regenerative Braking Control Strategy Of Pure Electric Vehicles

With environmental problems become more and more prominent,the pure electric vehicle has been paid more and more attention by the governments of the world,and has become one of the important development directions of the automobile manufacturers.But the pure electric vehicle has some shortcomings such as short running mileage and long charge time.Regenerative braking technology is one of the effective methods to improve the energy efficiency of pure electric vehicles and extend the driving range of pure electric vehicles.In this paper,the regenerative braking control strategy of regenerative braking system for pure electric vehicle is discussed.(1)The SOC of power battery is estimated more accurately.An empirical formula battery model was build,according to the experimental data to identify the model parameters;analyzes the process of traditional extended kalman filter in SOC estimate,discuss the influence of temperature and charge/discharge rate of the extended kalman filter algorithm,the fuzzy control theory was used to correct the matrix of extended kalman filter in the proportion of time update value and measurement update value.Simulation and experimental results show that the proposed algorithm can improve the accuracy of SOC estimation.(2)Regenerative braking control strategy was build.Analysis of typical regenerative braking control strategy,in accordance with the requirements of ECE,the control strategy of regenerative braking based on ECE regulation and I curve was put forward;analysis of the charge character of power battery and charging principle,the current control strategy of regenerative braking based on the Mas law was build;analysis the effect of the SOC and temperature of power battery,charging current,braking torque distribution in regenerative braking,hierarchical coordinated control strategy of regenerative braking for pure electric vehicle was build.(3)The secondary exploration of ADVISOR simulation software.The SOC estimation model and regenerative braking control strategy model are established in MATLAB/SIMULINK,and two typical cycle conditions are selected to simulation analysis,which are NYCC and New York UDDS.The effectiveness of the regenerative braking control strategy is verified by comparing the simulation results with the regenerative braking control strategy based on ECE regulation and I curve.