| With the problems concerning environmental protection and energy saving becoming increasingly prominent, the electric cars begin to attract the international attention for their zero emissions and low noise, making the whole world set electric vehicles as their automobile industry development direction.In recent years, many countries have injected a large sum of capital and human resources in the electric car industry, yet so far, they havn’t made any breakthrough in the field of battery, motor technology and controller technology which leads to the insufficient driving range to become the electric vehicles’bottleneck that greatly impede the development and popularization of electric vehicles. Therefore, how to choose these components and related parameters to achieve optimal matching, in the same battery and motor technology conditions and how to better meet the performance requirements of the vehicle with the largest power driving range has been a core question to be solved during the process of the electric vehicles development.Based on a type of electric vehicle manufactured by Yangzhou kaiersimai EV manufacturer, this paper set a research in transmission system matching and structural optimazition. Including:Firstly, this paper makes a detailed investigation about the basic structure and its key technologies of electric vehicles. Electric vehicles consist of four parts:power plant, chassis, body and electrical equipments, while the power plant and chassis are where the electric vehicles lies the biggest difference from conventional vehicles. Secondly, the design of electric car transmission system is very flexible. This paper introduces six kinds of transmission system design of the electric car, and compares the merits and demerits of the various design schemes Then, according to the performance requirements, vehicle parameters and market positioning of TM-12, combined with the operating mode of transmission system, this paper makes a reasonable calculation and selection for power components, including driver motor, battery and transmission system.Secondly, using the professional electric vehicle simulation software ADVISOR, developed by the U.S. National Renewable Energy Laboratory, combinedwith the mathematical model of drive motor and battery, this paper formulated the simulation model of the drive motor, control system, battery pack and transmission, etc. Then the vehicle model simulated under chosen road condition verify the reasonableness of former caculation and selection. Through simulation it can realize better parameters matching and optimization. And it also reamins a big savings in electric vehicle development process, shortening the the development cycle.Then, in premise of the safety of electric vehicles, FEA technology can be used for analysis and optimization on frame, with the purpose of achieving the efffect of lightening. Combined with bending and torsion conditions in the actual process, it analyzed stress and deformation of the body frame. In premise of ensuring stiffness and strength of the frame, it should put forward the improvement of the frame, reduce body mass, and improve the safety and dynamic performance as well.At last, using ADVISOR again to verificate rationality of optimization of the frame.Through the study, it provides theoretical reference of key technologies for electric vehicle design, dynamic performance prediction and optimization. |
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