摘要:随着人们对交通便利的需求，机动车辆被越来越多的使用。然而燃油交通工具在工作时必须排放尾气，过多的机动车辆尾气排放己造成了严重的空气污染问题。于是研发绿色环保的交通工具是现在发展的一个必然方向。

　　　中国是个人口大国，所以机动车辆的使用要多于他国，所以我国的空气污染问题要更为严峻，所以发展电动自行车具有重要的环保意义。尤其依靠先进的科技，发展电动自行车，可以方便百姓出行，缓解城市交通拥堵，同时又能起到抑制石油使用，降低空气污染的作用。这都具有重要的现实意义。所以电动自行车迅速的得到了普及。

　　　电动自行车在不断告诉发展的同时也遇到了发展的瓶颈。比如目前，市场上大多数的电动自行车产品均采用功能简单的控制装置。使其功能单一，不能充分发挥整个系统的潜力以及处理一些复杂的控制问题。本文将通过AT89C51单片机作为控制芯片设计电动自行车的控制器。次控制器可以对整个系统实时监控，能够完成很多功能，从而是使用者得到更好的骑乘体验。

关键词 电动自行车；AT89C51；控制系统；无刷电动机

Abstract:To fix the need of quickly transportation, all kind of vehicles are used increasingly. However, the more vehicles we used the more air pollution we created. With too much vehicle work at the same time ,it have caused serious air pollution. So the development of green transport has become a very famous topic.

　　　As we know the China is country with great population, so the use of vehicles more than other countries, so air pollution problems of China will be more severe. So the development of electric bicycles were very necessary to decrease the.air pollution. In particular, thanks to the development of the science and technology, the electric bicycles has become a very mature transport, people can easily travel and the ease urban traffic congestion, while restrain oil use, reduce air pollution effects. This has important practical significance. So it quickly gained popularity.

　　　With the development of electric bicycles , while also facing development bottleneck. Such as , electric bikes,which sell on the market,are mostly made of simple function control device. It has very simple function, which can not fully exert the potential of the whole system and to deal with some complex control problems. This article will design a controller with AT89C51 microcontroller as a control chip.Secondary controller can be real-time monitoring of the entire system, with ability to complete a lot of functionality to the user to get a better riding experience.

Keywords:  Electric bicycle  AT89C51  Control systems  Brushless motor