Research On Regenerative Braking System Of Rear Drive Type Pure Electric Vehicle

Along with the acceleration of the industrialization process, more and more people are having their own cars, this brings convenience to people’s travel, but also caused great harm to the environment, reducing the emission of toxic gases in the field of transportation has become one of the most important means to solve the problem of global climate deterioration at the present stage. Pure electric vehicle has become the main direction of the automobile vehicle development due to its low noise and low emission characteristics. After the test of electric logistics vehicle produced by the school and enterprise, it was found that the vehicle driving range is obviously inadequate, this hinders the development of its industrialization. In order to solve this problem, the test logistics vehicle was equipped with a braking energy recovery system. The braking energy recovery system can effectively improve the driving range, reduce the energy consumption and improve the economic efficiency of the electric vehicle.In the process of installing the braking energy recovery system for the test logistics vehicle, this paper mainly focuses upon the following work:By comparing the traditional mechanical braking system with the braking energy recovery system, the advantages of the braking energy recovery system were summarized. Multiple control strategies of regenerative braking system for electric vehicle were compared. Combined with the relevant braking regulations, considering the working characteristics of the motor and the battery, the control strategy of regenerative braking system was designed.The simulation of the vehicle specific software ADVISOR was used to verify the effectiveness of the proposed strategy. The mathematical model of the control strategy, motor, battery and electric vehicle model were established, these models were simulated under standard cycle conditions and custom conditions, by analyzing the simulation results, we can know that the control strategy can effectively increase the efficiency of energy recovery, improve the vehicle experimental economic and dynamic performance.In order to embed the designed control strategy into the test vehicle, the design of regenerative braking controller of the test vehicle was completed. Because the electric vehicle regenerative braking system must have the characteristics of accuracy and quick response, the chip of the regenerative braking controller of the test vehicle was DSP2812. According to the requirement of the regenerative braking system, the design of the minimum system circuit, sampling circuit, CAN communication circuit, rectifier circuit and so on, were completed. Finally, based on the completed hardware circuit, combined with the control strategy adopted by the test vehicle, the software of the controller was designed.