Research On Energy Recovery Strategy Of Dual Motor Plug-in Hybrid Vehicle Based On AMT

Since 2021,new energy vehicles have maintained a dynamic state of booming production and sales,a large market and high quality.Since the "14th Five-Year Plan",plug-in hybrid electric vehicles have become a hot topic,which can not only meet the longdistance mileage requirements of drivers,but also achieve the purpose of green travel.The excellent fuel-saving effect of plug-in hybrid vehicles benefits from its mature hybrid technology.The control strategy of drive and energy recovery is a crucial part of it.The research on the distribution of braking force and the shifting strategy of energy recovery can improve the energy recovery and improve the economy of the whole vehicle.This paper takes the dual-motor plug-in hybrid vehicle equipped with AMT as the research object,and analyzes and researches the relevant content of its braking energy recovery and shifting strategy in the process of energy recovery.The specific research contents are as follows:(1)The dual-motor configuration in this paper is a plug-in hybrid system composed of P1+P3 mode,and the specific working mode and energy flow path analysis are carried out for this configuration.On this basis,the simulation model of related components is built in MATLAB/Simulink/Stateflow through vehicle performance parameters.(2)The rule-based energy management strategy during driving is completed according to the working mode of the vehicle.The corresponding mode switching conditions and torque distribution are formulated for the high power stage and the low power stage respectively.At the same time,under the premise of ensuring braking safety,in order to recover as much energy as possible,a front axle braking force distribution strategy based on dual-motor energy recovery,an electromechanical braking force distribution strategy and a multi-level braking force between dual motors are proposed.Allocation strategy.(3)Because the driver often appears in the taxiing mode during the driving process,it is necessary to formulate the energy recovery strategy for the taxiing condition.Therefore,according to the different power generation efficiencies of P1 and P3 motors,a new gliding energy recovery method is proposed for the research object of this paper,so as to achieve the purpose of recovering more energy.(4)The energy recovery process is also affected by the power generation efficiency of the motor and the charging efficiency of the battery.In order to further recover energy,try to make the motor battery work in the high-efficiency range.Based on this,an energy recovery shifting strategy based on the efficient operation of the motor alone and an energy recovery shifting strategy based on the combined efficiency of the battery and motor are proposed.(5)Based on the above energy recovery and shift control strategy analysis in the energy recovery process,combined with MATLAB/Simulink/Stateflow to build different control strategy models and conduct off-line simulation.The simulation results of different strategies under cycle conditions,braking conditions and coasting conditions are compared and analyzed,the changes of relevant parameters of different strategies under various conditions are observed,and the simulation results of the above strategies are analyzed.