Research On The Modeling And Simulation Of Electric Vehicle

This report introduces the research and development of modeling and simulation of electric vehicle, which serves for the R&D of Chery hybrid electric car in China. This project is one part of Project of Hybrid Electric Car, which is the China National High Technology Research and Development Program of China (863 Program) in the Tenth Five-Year Plan Period and was developed by the joints of SAIC Chery Automobile Co., Ltd. and Hefei University of Technology. It can shorten the design cycle time of hybrid electric car, reduce the cost of R&D and improve the performance of vehicle.This paper firstly introduces the development of today's electric vehicle simulation software. Based on analyzing deeply the software platform, programming tools and system functions of the electric vehicle simulation software in the world, this paper summarizes the characteristics and development trend for the contemporary electric vehicle simulation software. In the end, the technical solutions for the simulation of Chery hybrid electric car are given.The next part is the study about two popular electric vehicle simulation softwares. The one is PSAT software, which is developed by Argonne National Laboratory in US. Based on introducing the system simulation functions of PSAT, this report analyses forward-facing simulation approach and model in PSAT and introduces the technology of simulation of Prius which is a hybrid electric car of Japan Toyota company. It includes analyzing the powertrain configuration of Prius, providing technical data about the vehicle, engine, motor and battery in the Prius. In the end, the Prius' simulation results and analyzing are given which include vehicle performance and working process under the condition of FHDS drive cycle. The other is ADVISOR software, which is developed by National Renewable Energy Laboratory in US. Based on introducing the system simulation functions of ADVISOR, this report analyses hybrid backward/forward simulation approach and model and introduces the system structure and data flow in ADVISOR.Then this paper introduces the R&D works about simulating the chery hybrid electric car by ADVISOR. Because that this hybrid electric car has the same drivetrain configuration as Japan Honda's hybrid electric car Insight, a solution is provided that a new car model is designed based on the model of Insight in ADVISOR. In this way, this paper designs a new control strategy and modifies the value of some parameters in model of Insight, then gives the results of simulation including the vehicle performance and work process, analyzes the effect that some variables likes vehicle gravity have on the vehicle.Further this paper introduces electric vehicle optimization design technology, which includes optimizing components sizes in drivetrain and optimizing control strategy.Firstly the mathematics description for those optimization problems are given. Then this paper analyses the principle and implement of optimization design in ADVISOR. These technology include how to invoke the functions in ADVISOR, howto develop optimization software by yourself and how to use ADVISOR'S co-simulation optimization software. In the end, some suggestions are given for optimization application for ADVISOR.Finally, a conclusion of this dissertation is given and some related issues and future work in this area are also addressed.ADVISOR has been developed on the MATLAB and Simulink, which can be downloaded freely on internet. All the programs and models are open in ADVISOR for its users. This report analyzes deeply the programs and models in ADVISOR and develops new programs and models for chery hybrid electric car. This work can give some useful suggestions for the automotive designer.