The Study Of Simulation Modeling And Energy Management Strategy Of Plug-in Hybrid Electric Vehicles

The automotive industry is a pillar industry of the national economy;it is an essential part of modern society.With the increase of vehicles and the growing shortage of energy,the problem of energy shortage and air pollution caused by traditional automobiles need to be solved urgently.New energy vehicles become the focus of research at domestic and abroad.Plug-in hybrid vehicle is currently the focus of this field research and development,which has the advantages of flexible driving mode,long cruising range and external charging.Since the plug-in hybrid vehicle is a multi-energy complex nonlinear system,it is very important to design a good energy management strategy and verify it quickly and effectively.In this paper the plug-in hybrid vehicles are the research object,and the modeling and energy management strategies of the hybrid vehicle are study.The main contents are as follows:Firstly,based on analyzing the powertrain structure and main components technical parameters of the plug-in hybrid vehicle,we study on the working mode and network communication of the plug-in hybrid vehicle.By analyzing the "V" shape development process based on the MBD method,the overall technical plan is designed.Secondly,based on the modularization idea,the key components such as vehicle dynamics model,engine model,motor model,battery model and transmission model are modeled by MATLAB/Simulink software.At the same time,the environment such as driver model,cycle condition model and charger model are modeled by MATLAB/Simulink software.Based on the idea of forward modeling,the vehicle simulation model is built,and the offline simulation platform is finally set up.Thirdly,the overall structure of the control strategy for hybrid vehicles is constructed.Threshold parameters are determined by the performance of the relevant components.Based on the use of power sources and operating modes,a hierarchical policy switching strategy and torque distribution control strategy based on rules are constructed and the control strategy is verified by offline simulation analysis.Finally,the online experiment platform is built based on dSPACE HIL test.The developed control strategy is used for the HIL experimentplatform of based on offline simulation,which provided the technical basis for the subsequent bench experiment and the final product development of the vehicle controller.