Wheel-side Drive Pure Electric City Bus Control Strategy Research

With the continuous development of the society and the continuous progress of people's quality of life,the problems of environmental pollution and energy shortage are becoming more and more serious.How to save energy and reduce emissions for automobiles is a serious challenge.The development of electric vehicles is considered to be the most effective solution to environmental problems.Electric vehicle of powertrain,as one of the core parts,is in urgent need of breakthrough.This thesis focuses on the in-depth research and analysis of the powertrain system of the wheel-side drive pure electric city bus.The main research contents and results are as follows:1)Based on Matlab/Simulink simulation software,the whole vehicle model of wheel-side drive electric bus is built,which includes dynamics model,motor model,transmission system model,wheel model,tire model and driver model,and so on.It can complete the driver intention analysis and drive anti-skid control strategy verification,and provide a simulation platform for the development of wheel-side drive system control strategy and the verification of simulation results.2)Analyze the driving intention of vehicle driver.This thesis mainly analyzes the starting control strategy of the vehicle and the analytical method of the two parameters of the acceleration pedal.According to the analysis of the open-loop start-up control strategy,the closed-loop start-up control strategy is selected.Then two different acceleration pedals are studied:one-parameter and two-parameter acceleration pedal analysis.When the single parameter acceleration pedal is analyzed,it is divided into three kinds of control strategies:general mode,dynamic mode and economic mode,and the three different control modes are analyzed.In the analysis of the two-parameter pedal,it is proposed that the two-parameter pedal The fuzzy control strategy can well judge the operation intention of the driver to the vehicle and meet the torque demand of the driver.And finally,the two-parameter accelerator pedal is compared and analyzed,and the double-parameter accelerator pedal can better reflect the operation requirement of the driver.3)The driving anti-skid control strategy is put forward.Firstly,according to the kinematics of the vehicle,the running wheel and ground are analyzed,the driving anti-skid control theory and the anti-lock principle are introduced,the slip rate is put forward,and then the sliding film variable control structure is put forward.Through a series of simulation results,it can be concluded that the sliding film control strategy proposed in this thesis can effectively prevent the over-slip of the wheel,make the slip rate of the wheel close to the optimal value,and improve the safety and stability of the vehicle operation.