Study On Parameter Matching Design And Control Strategy Of Multi-mode Electromechanical Coupling System For Electric Vehicle

Hybrid electric vehicles in terms of pure electric vehicles to improve the mileage and vehicle power,compared with the traditional internal combustion engine vehicle,in the low speed can use pure electric drive and high speed driven by the engine as much as possible to ensure that the engine and motor as much as possible working in high efficiency areas in order to improve energy utilization efficiency.Based on the provincial special project,this paper studies the multi-mode electromechanical coupling system proposed by the research group from the viewpoint of realizing the basic function.Firstly,the development background of hybrid electric vehicle is expounded,and several kinds of hybrid electric vehicles and energy management strategies are introduced.The new system with the five kinds of typical electromechanical coupling system has carried on the comparative analysis on the structure.At the same time,according to the characteristics of electromechanical coupling system in this paper,the power source of power flow on its topology structure and working mode are analyzed.Based on the dynamic design requirements,the methods and steps of the parameters of the electromechanical coupled system are given.Secondly,the energy management strategy based on the logic threshold is developed,under the power requirement,control the engine as much as possible in the optimal working area of the power source power distribution problem and the maximum recovery of the motor braking power before and after the axle power distribution problem are analyzed,and energy distribution and the mode switch simulation model is established.Thirdly,the method of experiment and simulation is used to test the gearshift characteristics and transmission efficiency of the two working modes of the pure electric drive.The results of the bench test are compared with the simulation results obtained in the Amesim environment,and the rationality of the design of the power source components is verified.Finally,a vehicle simulation model is established in Matlab/simulink by combining the theoretical analysis and mathematical modeling.The dynamic analysis of each driving mode of the new scheme is simulated and verified.In this paper,new scheme and five kinds of typical electromechanical coupling systems with the same power source and vehicle parameters were analyzed and compared under the ECE_NEDC cycle condition.At the same time,based on the regenerative braking control strategy,the regenerative braking energy recovery efficiency is analyzed with a hybrid vehicle.The main contents of this paper are to verify the basic functions of the proposed new electromechanical coupling system of hybrid electric vehicle.At the same time,provides a complete design methods and steps for the hybrid electric vehicle electromechanical coupling system development.