Design And Simulation Optimization Of Dual Motor Powertrain Of Pure Electric Vehicle

Due to the advantages of energy saving and environmental protection,high transmission efficiency,low driving noise and good handling smoothness,electric vehicles have also become the mainstream research direction of urban traffic technology development.As the last link of logistics transportation,the technical research of express transport vehicle in the city has also attracted extensive attention.At present,most electric vehicles use single motor drive control system,the control strategy is simple,but the highefficiency area is unique,so it is difficult to take into account the power and economy under complex and diverse working conditions.Therefore,exploring and developing a new electric vehicle drive control system is of great research significance to solve the problem of "mileage anxiety" of trams and realize China’s carbon neutralization strategy.n this paper,according to the driving conditions of express transport vehicles in the city,the pure electric mini truck with coaxial dual motor drive system is used as the research object,and the main work is studied,such as the comparative analysis and design of dual motor architecture,the parameter matching and selection of battery motor,the development and construction of control strategy and so on.It includes the following contents:(1)Dual motor architecture design: compare the existing dual motor architecture,and analyze its working principle and transmission characteristics.According to the requirements of urban express transport vehicle driving conditions,combined with the advantages and disadvantages of the existing configuration,a coaxial double motor structure with high reliability,low transmission loss,simple structure and easier production and manufacturing is proposed,and its working mode is analyzed.(2)Parameter matching of dual motor drive system: Based on the provisions of vehicle performance indicators,the selection and parameter matching of main and auxiliary motors and main reducer are carried out.At the same time,based on wltc cycle condition,the torque and speed parameters of the two drive motors are matched,and finally the motor selection and parameter matching are completed;(3)Research on power distribution and shift strategy: calculate the driving torque demand of the vehicle and design and develop the corresponding control strategy.The mathematical model of dual motor power system is established.Taking speed and acceleration as constraints,the switching nodes of the three driving modes are adaptively divided based on particle swarm optimization algorithm,and the most efficient driving mode under the current working condition is obtained;(4)Experimental verification and analysis: build the whole vehicle model using cruise2015,build the control strategy model of the driving system on Simulink,set the project task,and conduct the joint simulation test on the power and economy of the whole vehicle through DLL module element.The analysis and simulation results show that the matching parameters are correct and reasonable,and compared with the single motor drive,the energy consumption per 100 km of the vehicle using the coaxial dual motor drive system is reduced by 5.46%.Compared with the energy consumption of other coaxial dual motor drive systems,the economy is improved by 2.48%,5.46% and 8.26% respectively,which verifies the superiority of the energy consumption of the drive system in this paper.