1. 研究目的与意义（文献综述）

research background

development of underground building project is an inevitable trend of urban construction in the future.with the rapid expansion of population,lots of things,such as per capita space, ecological environment and traffic etc,will face serious challenges. so nowadays many countries in the world, especially countries with small size, such as britain, norway, japan and south korea, are actively committed to underground building project. singapore, the country which has the reputation of garden city, also started building urban tunnels early in 1996.by now,singapore has built a lot of underground square, subway,urban tunnels and even punderground city.moreover,in its urban construction planning in 2017,singapore plans to build a new 30-floor-high underground academic city. large-scale underground project construction requires efficient and convenient underground transportation methods. however, the mode of transportation by the hoist is not only inefficient but also increase the difficulty of engineering. if the transportation operation mode is innovated and improved, it will be a great help to promote the development of underground project construction .

currently driverless technology has been used by some rail vehicles, mainly for passengers and transportation. for the use of wheeled vehicles and in the use of the ground passenger cars, with the reason that the price is more expensive and the relevant sensors used in the ground wheeled vehicles will be invalid and difficult to deal with complex road conditions, so it can not be put into market. with regard to the general layout of electric vehicles, such as chassis driving and component arrangement, there are mature research results at home and abroad. in general, the total layout design can be more flexible, but in market application, the layout of electric vehicle is still on the base of the layout of fuel vehicles. while the electric vehicle with driverless driving technology, although many research results, there is no such authoritative concept to obey in its general layout design.[4][12][13]

2. 研究的基本内容与方案

the Basic Content1.Through searching literature, investigation and calculation, determine the chassis layout range of height, width and length,wheelbase and other dimensions.2.Through searching literature, determine the drive type and arrangement of the motor and the layout of the battery.3.Through investigation, calculation and research literatures, layout of important parts on chassis such as wheel size and steering system, suspension mechanism is determined. 4.According to relevant regulations and different arrangement's requirements of high voltage wire harness and low-voltage wire harness, optimize chassis layout and determine the total layout of wire harness. 5.Determine the size and position of the body parts, such as headlights, charge pump and windows. finish the final renderings. 6.Virtual rendering of the total layout of the vehicle and drawing the overall arrangement diagram.the Technology Programme and Objectives According to the planning lines, the establishment of road signs and signals, while using visual navigation technology and arranging sensors, receivers and other devices, ultimately the engineering vehicle can traval day and night between the two destinations. The size of the engineering vehicle is based on that of the underground traffic.The vehicle will be smaller and lighter than the ground vehicles, and will not bring pressure for the underground traffic construction.Writing MethodsAccording to the actual conditions, the paper adopts a variety of scientific and effective methods，for exemple，demonstration, investigation, literature research, mathematical methods and so on.

3. 研究计划与安排

2017.03.19-2017.03.24, complete the translation work.2017.03.25-2017.03.28, determine the layout of motor and battery.2017.03.29-2017.04.05, determine the layout design of all important components of the chassis.2017.04.06-2017.04.09, determine the wiring harness layout scheme, and optimize the overall chassis layout.2017.04.10-2017.04.13, completed the layout design for all parts of the body.2017.04.14-2017.04.24, complete the drawing and specification compilation.2017.04.25-2017.04.30, put papers in order.

4. 参考文献（12篇以上）

reference

[1] hong yongfu. automobile overall design [m]. beijing: mechanical industry press.2015:242-353.

[2] zhou houjian, ke jiang lin, zhang guanghui. study on the layout of key components of pure electric vehicle [j]. shanghai automotive, 2016 (3): 7-10.