摘要:交通控制系统是近现代社会随着物流、出行等交通发展产生的一套独特的公共管理系统。要保证高效安全的交通秩序，除了制定一系列的交通规则，还必须通过一定的科技手段加以实现。随着社会经济的发展，数字电路交通灯越来越不能满足日益增长的交通压力，因此必须寻求一种新的方法来取代这种复杂而工作不稳定的控制系统。现今PLC技术飞快发展，应用越来越广，在工业自动化中的地位极为重要，广泛的应用于各个行业。随着科技的发展，可编程控制器的功能日益完善，加上小型化、价格低、可靠性高，在现代工业中的作用更加突出。

　　　本论文就是运用PLC技术来实现对十字路口的交通灯的控制，介绍了可编程序控制器的基本原理，并以标准的十字路口为研究对象，设计了两相位交通信号控制系统，为了达到要求，并考虑到节省电子元件的成本，以达到最大经济效益，运用三菱系列的PLC来控制交通灯的变化，经过对现今交通灯控制系统进行实地考察，选择一种最优方案，用以在一定程度上缓解目前交通压力。

关键词: 交通灯； PLC；控制系统

Abstract:In modern society traffic control System is served as a unique set of Public management system following the Pace of logistics and transportation. To ensure the traffic efficiency and security，a certain scientific means is required to improve the implementation of a series of traffic rules. The rapid developed social economy makes digital circuit traffic lights fail to meet the increasing traffic pressure. Therefore, new methods must be designed to improve its complexity and instability. Nowadays as the fruit of science and technology, the plc technology has shown its much importance in various industries, and the programmable controller is given much more attention for its miniaturization, low price and high reliability.

　　　By designing two phase traffic signal control system on the basic principle of programmable controller, this thesis focuses on the control of traffic intersections through PLC technology with standard crossroads as the research object. In order to achieve maximum economic benefits and save the cost of electronic components, Omron series of PLC is used to control the traffic lights. Also on-the-spot investigation shows an optimal program is taken the current traffic pressure.

Keywords:  traffic lights；PLC；control system