Parameter Matching And Simulation Of Powertrain For Range-extended Electric Vehicle

Extended-range electric vehicle(E-REV for short) is a kind of electrical vehiclewith two operation modes. Electric power is the main energy for driving the car, andthe engine is an auxiliary power unit. Its power system mainly consists of batteriesand small generators. In daily driving, the E-REV is similar than the pure electricalvehicle, can fully meet the requirements of daily drive without starting the engine.When the battery state of charge (SOC for short) reaches a lower level, the enginewill start as an active power source to supplement the vehicle required electricenergy, while the redundant power is used for charging. The program parametersmatching and performance simulation of the E-REV for complete vehicle propertieshas a critical role in the powertrain component parameters. The optimization of theparameters matching can make the vehicle components run in the best working areaand improve the energy efficiency. The software-based simulation and analysis ofthe power, economy and emission performance can verify the rationality andeffectiveness of matching parameters and control strategy to shorten thedevelopment cycle, reduce cost saving and give full play to the advantages ofE-REV.The parameter matching and performance simulation of E-REV are studied asthe key point in this thesis. Comparatively analyzed the characteristics of thecurrent E-REV and other new energy vehicles. Based on the dynamic performancerequirements, the selection principle and matching design method of system arestudied. The main components of powertrain system including drive motor, batteryand rang-extender, were selected and calculated. Then, according to the runningcharacteristics, dynamic and economical requirements, the energy distributioncontrol strategy is made for E-REV. Conversion of pure electric drive and extendmode is based on the SOC logic gate limit control strategy, while the extend mode isbased on the combination of constant power and power following control strategy.According to battery SOC and power, the extend mode is divided into six workingstates. AVL-cruise is used as the platform to build the vehicle model, the controlstrategy model is built using Matlab/Simulink and with the State transition flowchart, created the DLL files for the co-simulation. Based on Cruise andMatlab/Simulink co-simulation platform，a simulation verification is conducted onthe matching powertrain designed．The simulation results demonstrate that the parameters matching meet theexpected economic performance and dynamic performance demand. The energy distribution control strategies can effectively improve the economic performance ofvehicle. The study provides effective reference for the further study of the E-REV.