Mechanism And Method Of Dual Mechanism Shift Control For Electric Vehicle Dual Mode Coupling Drive System

With the advancement of pure electric vehicle technology,new energy vehicles,mainly pure electric vehicles,are showing a thriving trend of development.As one of the core technologies of pure electric vehicles,the electric drive system has two main configurations: centralized drive mode and distributed drive mode.When the vehicle is operating in centralized driving mode,if the vehicle is driving on an open road surface,due to the non-differential torque characteristic of the differential,it will cause the vehicle to be unable to get out of the trap;When the vehicle operates in distributed drive mode,when one side of the drive motor fails,the vehicle will experience yaw or roll,greatly affecting driving safety.The dual mode coupled drive system for pure electric vehicles invented by our research group,which can achieve both centralized and distributed drive modes,and has a double speed transmission function,perfectly solves the above problems.In order to make the system shift more smoothly and improve the service life of shift components,this paper designs a dual mechanism for dual mode coupled drive system shifting,aiming to overcome the shortcomings of the single mechanism currently used,Improve the shifting quality of pure electric vehicles.The main research content of this article is as follows:(1)Introduce the single machine mechanism currently used in the dual mode coupled drive system of pure electric vehicles for shifting,establish a dynamic mathematical model of the single machine mechanism,and analyze its shifting interference mechanism through joint simulation with ADAMS and MATLAB/Simulink.(2)Propose a dual mechanism shift scheme and design its overall configuration.The feasibility of the designed dual mechanism scheme and control strategy is verified through joint simulation with ADAMS and MATLAB/Simulink,and the shift performance of the single mechanism is compared to highlight the advantages of the dual mechanism.(3)Optimize the shifting algorithm of the dual mechanism and verify the superiority of the staged fuzzy PID control algorithm as a control algorithm in time-varying load systems.Finally,conduct a real vehicle test to verify the actual shifting quality of the dual mechanism.The experimental results show that the designed dual mechanism and control strategy outperform traditional mechanisms in gear shifting evaluation indicators,and have good gear shifting quality.