Research Of Regeneration Braking Control Strategy Of Pure Electric Vehicle

Cars have occupied an almost irreplaceable position for people's daily life and transportation.However,the problem of air pollution caused by fossil fuel combustion and the energy crisis associated with oil over-exploitation have gradually attracted the attention of the global automotive industry as the world's automobile production and possession increasing.The power of an electric car comes from the electric motor,and the electric motor can be driven by electric energy,and the electric energy can be obtained by other forms of energy.Therefore,compared with the traditional fuel vehicles,electric vehicles are clearly superior in terms of reducing energy consumption and transmission efficiency.However,electric vehicles still have some obvious technical shortcomings,such as the technology of regenerative braking.Hence,appropriate control strategies have great significance for vehicle driving safety and energy recovery.Firstly,this paper expounded the basic concept of regenerative braking,and analysed energy transfer and working principle of the regenerative braking system.The energy storage device was introduced.Then the regenerative braking system structure of the parallel?series and this paper used were introduced.The influencing factors of regenerative braking and the braking mode of electric vehicles were illustrated in detail.Secondly,it elaborated the equation of motion of the whole vehicle during braking,the dynamics knowledge applied by the electric vehicle during the braking process and the principle of electric vehicle braking force distribution.it also introduced the ideal braking force distribution,parallel braking force distribution and optimal energy recovering,then analyzed good and bad quality of the three regenerative braking strategy and a brake distribution strategy based on fuzzy control was proposed.Then,the main characteristics,system structure and simulation methods of the electric vehicle simulation software ADVISOR2002 were introduced.The default brake control strategy and brake simulation module of ADVISOR were mainly studied,and the brake force distribution model based on the fuzzy control strategy was built by Matlab/Simulink software.Finally,the designed strategy was simulated and tested.New control strategy and simulation model was embeded into ADVISOR software,the typical cycle conditions of China,America and Europe were selected for simulation research.By comparison between results of simulation of strategy proposed and software's own strategy,verifying the strategy proposed in this paper not only significantly improves the residual SOC of the battery,but also increases the energy recovery efficiency of the regenerative braking system.At the same time,the designed regenerative braking distribution strategy was put into the vehicle controller,and compared with the default strategy of ADVISOR in the actual road test.The comparison of the test data fully verified the feasibility and practicability of the design strategy.