Research On Driving And Shifting Strategy Of Electric Commercial Vehicle Based On Driving Style

In 2020,the world’s energy is in urgent need,and the environmental problems and greenhouse effect are becoming more and more serious.In addition to further optimizing the traditional internal combustion engine technology,new energy vehicles have become the inevitable trend of future development.Compared with traditional vehicles,electric commercial vehicles have the characteristics of low energy consumption,low noise,simple structure and easy production,which are widely concerned by governments.Based on the electric commercial vehicle as the research object,this paper introduces the driver style coefficient as the adjustment quantity,adjusts the driving control strategy and shift strategy,and formulates the driving control strategy and shift strategy under different driving styles.The main contents of this paper are as follows:(1)Through the analysis and comparison of the existing electric commercial vehicle structure,the traditional electric commercial vehicle structure with multi gear AMT is selected as the research object;according to the proposed performance and technical requirements,the parameters of drive motor,power battery and transmission ratio are matched,and the matched parameters are simulated off-line to ensure that the vehicle technical performance requirements are met.(2)According to the analysis of electric commercial vehicle mode,the mode switching input parameters are selected.Through the real-time state of the vehicle and driver operation,the mode switching conditions are formulated,and the model is built by using Matlab /Stateflow.Finally,the accuracy of mode switching is verified by the given input parameters.(3)In this paper,a driving control strategy based on driver style coefficient is proposed,which takes the curve of power and economy torque coincidence coefficient as the boundary,and the driver style coefficient adjusts the torque coincidence coefficient in real time to realize the steady-state torque output;in order to enhance the vehicle power performance,a transient compensation torque algorithm based on vehicle speed and accelerator pedal opening is proposed to better meet the driving requirements Driver’s requirements for dynamic performance.The driving control strategy model is built in Matlab / Simulink.(4)In order to serve the real-time changing torque coincidence coefficient in(3),this paper also formulates the shift law under different driving styles,which is calculated by motor characteristics and transmission ratio of each gear.In order to verify the correctness of the shift rules under different driving styles,NEDC and fixed pedal conditions are selected to test the car’s economic performance and power performance.(5)Combined with theoretical knowledge and vehicle dynamics formula,the vehicle power battery,drive motor and vehicle dynamics model are modeled.Combined with the drive control strategy,the torque battery SOC and speed of up and down gear were observed and analyzed.