Research On Energy Management And Coordination Control Strategy Of A Plug-in 4WD Hybrid Electric Vehicle

In recent years,environmental problems and the energy crisis have brought great challenges to the development of the automotive industry,which lead the automotive industry change to the direction of clean and pollution-free energy.Hybrid cars can be seen as a transition from traditional fuel vehicles to pure energy vehicles.Hybrid car takes high economy,less emissions and good driving performance as a design goal,which can be a good solution to ease the problems caused by the two pressures.This paper take a plug-in 4WD hybrid electric vehicle as the research object,aims to improve the fuel economy and take good driving performance into account.This paper mainly studies the development of energy control strategy and coordinated control of plug-in hybrid electric vehicles at home and abroad,and points out the necessity of studying energy management and coordination control.Basic structure of the plug-in four-wheel drive hybrid vehicle is analyzed,and the simulation model of the vehicle is established,which includes model of the driver,the engine,the motor,the controller,the vehicle dynamics model and so on.The controller energy control algorithm is developed,and the working mode is divided according to the best working characteristic curve of the engine,the output of the power part in each mode is determined.The dynamic coordination control strategy is established.The neural network is used to estimate the dynamic torque of the engine.The fuzzy control algorithm is used to control the clutch process.A dynamic coordinated control strategy for dual motor torque compensation control is proposed.Finally,the simulation model of energy management and coordination control strategy is built in Matlab/Simulink environment.The simulation results show that the proposed energy management strategy can meet the working requirements of the vehicle model.The dynamic coordination control strategy can effectively reduce the impact of the mode switching process,improve the driving experience.