Modeling,Simulation And Bench Test Of Electro-Mechanical Variable Transmission Of Hybrid Electric Vehicle Powertrain

Electro-mechanical variable transmission of Hybrid Electric Vehicle Powertrain has theelectrical and mechanical ports. It can convert energy and separate coupling without clutchand extra starter motor, and can also make the engine work under the condition of best fueleconomy line within the wide range load. Moreover, it has advantage in reducing fuelconsumption, improving efficiency and optimizing engine performance. Therefore,Electro-Mechanical Variable Transmission becomes the focus in the study of the autoindustry.This paper takes a novel Electro-Mechanical Variable Transmission with independentintellectual property rights, which mainly composed of anti-direction dual-rotor motor andplanetary gear train, as the research object; It systematically researches the transmissioncharacteristics, fuel economy and mode switching comfort in a integrated way of theoreticalanalysis, modeling and simulation study and bench test. The main work includes thefollowing parts:1) Detailly analyzing the working mechanism of Electro-Mechanical VariableTransmission; Building the systematic speed and torque transmission characteristics by theway of the lever analogy; Analyzing the work mode and the direction of energy flow;2) Introducing the theory of hybrid system to describe the Electro-Mechanical VariableTransmission Vehicle that holds the continuous variable dynamic system and discretedynamic system; Based on the MATLAB/Simulink/Stateflow simulation platform,establishing the torque control strategy based on the discrete dynamic system, of which thefunctions are to identify the total demand torque, determine the mode switching condition andthe target torque; Build the key parts of the driver model, vehicle dynamics model, powersupply, battery, double planetary gear train dynamic coupling model, and taking UDDS,NEDC and1015cycles as examples, analyzing the energy management simulation, studyingthe torque control strategy based on hybrid system theory and researching the economic fuelof electro-mechanical transmission system;3) According to the necessary of the development of Stable power transmission control strategy of Electro-Mechanical Variable Transmission, establishing the dynamiccharacteristics model of the key parts; Based on the engine test statistics, building A BP neuralnetwork model of engine torque estimation; Setting up double planetary gear train dynamiccoupling model; Based on the bench test feature, establishing transferred dynamic functionmodel of a double rotor motor and brake; According to the systematic structure features,building and putting forward the coefficient control strategy:"torque distribution+enginetorque estimation+motor torque compensation+coordinating compensation; andsimulating according to the pure electric mode switching to setting the condition and fullcondition of hybrid drive mode;4) Based on modular design idea, building a hybrid drive system assembly test be nchand introducing the assembly test bench basic working principle in detail, and under theguidance of previous theory, studying the basic characteristic and testing the efficiency of thesystem then summing up the methods for further technical research in the future.