Research On Regenerative Braking Control Strategy Of Wheel Drive Electric Vehicle

Wheel-driven electric vehicles can effectively improve the current energy crisis and environmental problems.However,due to the braking friction effect,the kinetic energy of vehicle operation will be transferred to the air and wasted in the form of heat energy.In order to avoid the waste of energy to a certain extent,regenerative braking technology is urgently needed to reuse the braking energy.Because the current regenerative braking strategy for light hub-driven electric vehicles is relatively simple and lacks the influence of other parameters on the strategy,it is not applicable to more complex actual conditions.Therefore,this paper conducts an in-depth study on the regenerative braking control strategy of hub-driven electric vehicles,mainly in the following aspects:(1)Firstly,the regenerative braking principle of hub-driven EV is introduced in detail,and the vehicle mechanics and dynamics analysis are carried out for the whole vehicle,maximum speed,maximum climbing slope and other main parameters of the light-weight rear-drive EV developed and designed by an electric vehicle company in Hangzhou,and a mathematical model is established.(2)Secondly,a regenerative braking control strategy based on braking force F,speed V and SOC decision regenerative braking proportional coefficient K is proposed.According to the fuzzy control theory,the regenerative braking control strategy with F,V and SOC as the input and K as the output is formulated.Then,the specific values of the four parameters are optimized by genetic algorithm to obtain the final fuzzy controller.(3)Thirdly,by combining the contents of previous chapters,a simulation model was established for the research object,the ADVISOR was re-developed and embedded into the GA-optimized fuzzy control model designed in this paper.Simulation experiments were carried out under the working conditions of CYC＿NEDC and CYC＿UDDS with different SOC values,and the results were compared to verify whether the results met the expected requirements.(4)Finally,the effect of the control strategy designed in the previous chapter in the actual controller is verified.The 32 bit microcontroller TC1782 based on INFINEON Tri Core as the core and other hardware and circuits are designed,and the corresponding program is also designed.After the designed controller and control strategy are embedded in THE HIL test cabinet of d SPACE,the hardware-in-the-loop simulation experiment is carried out,and the experimental results verify that the developed control strategy can significantly optimize the vehicle endurance capability.