Research On Control And Component Sizing Method Of PHEV Based On Dual-motors Structure

The automobile industry are facing unprecedented challenges with increasingly serious energy crisis and air pollution.More and more stringent fuel consumption and exhaust emission standards promote the development of HEV industry.PHEV adds electric drive system to the traditional vehicle transmission system and is equipped with a larger capacity battery.On the basis of realizing zero emission during short distance commute,it also solves the problem of long-distance driving range.The core of the PHEV control system is the battery,motor and electronic control,in which the vehicle electronic control is directly related to the power performance,comfort and fuel economy of the vehicle.In this thesis,the problem of vehicle control is studied based on the project of PHEV with dual motors structure.The details of the work are as follows:The parameters of engine,drive motor,generator and power battery pack are calculated and matched based on the overall structure and design performance index of the PHEV.Through the test data of power system components,the longitudinal dynamics model of the vehicle is built by AVL CRUISE platform.A rule-based energy management strategy is proposed.The control methods of vehicle system including engine,power battery and so on are studied in this thesis.The mode switching strategy and torque allocation strategy are proposed for the vehicle working phases and working modes.The vehicle strategy model is built through MATLAB/Simulink platform,and the joint simulation of control strategy and longitudinal dynamics model is realized through CRUISE Interface.The power performance of the vehicle is verified,and the fuel consumption and the economy of the CD and CS stage are simulated respectively.Taking the CAN network system of the PHEV vehicle as the research object,this paper introduces the structure characteristics and protocol standard of the CAN network,designs the whole vehicle CAN network architecture,and formulates the whole vehicle communication protocol,and verifies its communication performance.According to the matching results of each componet of the vehicle,the optimal design is carried out on the basis of the concept of the hybridization ratio,and the scalable model of the engine based on the Willans-Line is established for simulation verification.