1. 研究目的与意义（文献综述）

cars are the main carrier of national technological capabilities. in recent years, the national economy has developed rapidly and the automobile industry is entering an unprecedented period of prosperity. at present, global resource and environmental issues are becoming more and more prominent. energy issues have become a problem that must be solved influencing the global economy and development. the development and utilization of new energy sources has become the key to alleviating energy shortages. in order to reduce the pollution emissions of urban vehicles and realize the development strategy of new energy vehicles, pure electric buses are becoming more and more popular. with the development of new energy technologies, new energy passenger cars and commercial vehicles have been greatly developed. this design is aimed at the general layout design of a 6100bev pure electric bus body. the reasonableness of the body design can not only reflect the level of the car technology, but also improve the driving stability and safety of the car. through this design, the focus is the design of the driving area, and the ergonomics of the driver is combined to check the design of the overall layout of the vehicle body, providing the driver with good operating conditions and providing comfortable ride conditions for the passengers.this task can help student cultivate sound design ideas, exercise the ability to analyze problems and solve problems, especially master the methods and techniques of overall design and component design.

comprehensive use of automotive design principles and other relevant professional knowledge to analyze and solve problems in life and work, to achieve theoretical and practical, and further consolidate what you have learned

in recent years, with the increasing shortage of the earth's energy problems and the increasingly serious environmental problems, the development of new energy sources has become the trend of the times. the impact of new energy technologies on the automotive industry is particularly evident, and may even bring subversive changes to the existing automotive industry. as the main transportation force of urban public transportation, bus passengers are inextricably combined with new energy. the advantages of bus passengers with large passengers and low travel costs will be more obvious with the development of new energy technologies. this project selected the pure electric 6100bev bus as the object, and carried out the overall layout design of the bus body, and made preliminary attempts and explorations on the combination of new energy technology and bus. at the same time, i hope to take this opportunity to test the theoretical knowledge of automobile professionalism i have studied in the past four years, further use it in connection with practice, get exercise and improvement in the practice process, understand and familiarize with the whole design process, and gain experience for future development.

at present, pure electric vehicle technology mainly has three frontier technologies, namely power battery, distributed drive electric vehicle driving control technology, pure electric vehicle braking capacity recovery technology. at present, the main research hotspots of pure electric vehicle power battery system are as follows: (1) using new electrode material system and high safety material to improve the performance of lithium ion battery, such as spinel structure cathode material and olivine structure cathode material; (2) building battery coupling model by combining the characteristics of battery mathematical model, electrochemical model and equivalent circuit model to realize all-sided. on-line monitoring of bit batteries; (3) optimizing the estimation accuracy of soc and soh by using kalman filter and other non-linear filtering estimation algorithms as well as the comprehensive application of various algorithms; (4) improving the consistency of single batteries by improving the balanced charging technology of batteries. the torque of each driving wheel of distributed drive electric vehicle can be controlled independently, which brings great advantages to the dynamic control of vehicle chassis. compared with centralized drive electric vehicles, the current research on drive control technology of distributed drive vehicles mainly focuses on electronic differential technology, direct yaw moment control technology and multi-objective coordinated integrated control technology. among many research directions on braking energy recovery technology, research hotspots are: (1) using new composite/hybrid energy sources to improve and optimize the energy recovery rate of braking energy recovery system of electric vehicles; (2) using new mechanical braking system to develop series braking energy recovery system and control strategy with high energy recovery efficiency; (3) according to braking energy recovery system and abs/esp. according to the working characteristics of automotive electronic products, the coordinated control strategy of braking energy recovery and abs/esp is studied; (4) according to the braking comfort brought by braking energy recovery, the consistency of braking sensation and the realization method of electric vehicle are studied; (5) intelligent algorithm is used to identify braking intention and optimize the power distribution of machinery and motor according to the recognition results.

2. 研究的基本内容与方案

研究内容1.Drafting of the design plan；

2.Driving area layout design；

3.Interior design；

4.Arrangement and check of each component of the body

3. 研究计划与安排

1.the first stage: identify graduation design topics, review and collect relevant information；

2.the second stage: determine the research method, analyze the processing data, write the design specification；

3.the third stage: conceive the design content, preliminary product design；

4. 参考文献（12篇以上）

[1]《中国公路学报》编辑部.中国汽车工程学术研究综述2017，2017.

[2]查保应，张立辉.一种纯电动窄车身城市客车设计与研究.商用汽车，2016（7）.

[3]唐唯伟，何仁，游专，张中帆.纯电动客车车身优化设计.机械设计与制造,2013（12）.