1. 研究目的与意义（文献综述）

unmanned electric vehicle is a kind of intelligent vehicle that can feel the surroundings with various sensors and control the steering and speed of the vehicle based on the acquired information such as roads condition, vehicle locations and obstacles, which reduces the effort of human factors on driving safety. at the same time, unmanned electric vehicles only needs to use electricity instead of oil which contributes to serious environmental pollution. moreover electric energy can be obtained from wide range of resources: such as hydro, wind, nuclear materials, solar, etc. with the continuous development of technology, more and more unmanned electric vehicles can be developed in the near future.

in early 1980s, the us department of defense gave large-scale funding of alv (autonomous land vehicle) research. unmanned vehicles were first successfully applied to the highway with high degree of structural environment, some of the representative are as follows: navlab-5 of united states carnegie mellon university, vamp of german defense force university, argo of italy parma university and so on. the carnegie mellon university's navlab-5 smart driving system completed a project of unmanned driving across the united states in 1995 without hands. the steering wheel is controlled by the machine and the driver is responsible for the throttle brake operation. in the 2011 grand cooperative driving challenge in the netherlands, the driver operated the steering wheel, and the speed is controlled by machine to fleet. in 2011, the italian vislab team completed an unmanned driving from rome to shanghai.

for the electric vehicle braking, japan toyota motor corporation developed a hybrid car "prius" with regenerative braking system, adjusting the hydraulic braking force according to the braking force controlling strategy in the braking process and the electro-hydraulic ratio, which can achieve joint control of regenerative braking and frictional braking, making the vehicle energy efficiency increased by 20% or more and it can also guarantee the braking stability. us tianhe automobile group have developed a regenerative braking system for hybrid vehicles. it also improves the braking stability and safety based on a high efficient recovery of the braking energy through the anti-skid control assistance and the active hydraulic assistive technology.

domestic unmanned vehicle research started late. the research was mostly undertaken by universities and research institutions. for instance, national university of defense technology and china faw group developed the red flag hq3 unmanned vehicles, thmr-v (tsinghua mobile robot v) 5-person driving car of tsinghua university, unmanned technology in china urban transport called country items i berc3 of shanghai jiaotong university and the collaboration between the university and eu scientists. in domestic area, national university of defense technology completed unmanned driving test in august 2011 on a highway, at a distance of 286km between changsha and wuhan.

2. 研究的基本内容与方案

2.1研究的基本内容

the main objective of this project is to design an unmanned electric vehicle with the following characteristics: small size, two-way driving, slow running speed (lt;= 20km / h) and trailing. since the speed of the vehicle is low, therefore, the braking requirements are not very high. hence the universal types of brakes can be used in the design of the braking system, but all the brake system sub-units must satisfy the minimum occupied space requirements;

(1) to analyze the status of domestic and foreign unmanned brake system, select the appropriate type of brake with characteristics of tunnel engineering vehicle, and design the implementation manual for the control of the unmanned electric vehicle;

(2) according to the selected motor parameters and its control principle, an electric vehicle brake circuit control system will be designed;

3. 研究计划与安排

week 1: selection of the graduation project topic, graduation project assignment book (related parameters), and the school data collection;

week 2: writing the whole concept of the program, literature review and complete the opening report;

week 3-4 weeks: foreign language translation, data re - collection;

week 5-7: related design calculations and sketching of braking system;

4. 参考文献（12篇以上）

[1] zhifeng wang, pengfei zhang, kezhong he. scheme design of intelligent vehicle automatic control system [j]. vehicle and power technology，2011，（1） ：27-55.

[2] zijie wang，miaohua huang，yadong deng. ev modeling and simulation of regenerative braking system [j]. journal of wuhan university of technology (information and management engineering)，2001，23（4）：103-105.

[3] jiawei wang，haodong yuan，ying wu. talking about the development prospect of intelligent transportation and unmanned technology [j]. enterprise technology development，2011，30（14）：62-59.

[4] xun jiang，miaohua huang. modeling and simulation of regenerative braking control for electric vehicles based on advisor [j].beijing vehicle，2007，（11）：23-26.