1、摘 要随着社会的发展和进步以及人民生活水平的提高，上路的车辆越来越多，但相应的公路设施却没有相应的改善，这就导致了城市交通拥堵问题突出，而且拥堵的地方多是十字路口等车辆汇集处。如何改善交通灯控制系统，以适应现在的交通状况，成为竞相研究的课题，本文对该问题给予了深刻地研究。本文十字路口交通灯控制系统主要用于处理十字路口车辆及行人通过的问题，使其减少相互干扰，提高了十字路口的通行能力。本文总结了交通灯控制技术的发展，讨论了基于 PLC 的十字路口交通信号灯控制系统的设计可行性。根据 PLC 的工作原理并结合城市交通的实际状况，本文提出了以三菱公司生产的 FX2N-128MT-001 型 PLC 作
2、为基本控制核心，安排了四个方向的直行、左转红黄绿灯，人行道红绿灯以及倒计时数码管的具体配置；设计完成了PLC 的 I/O 端口分配和控制程序；探索了基于红外遥控的十字路口交通信号灯的无线强通控制方案并设计了具体的硬件电路及软件控制程序。关键词：十字路口；信号灯；PLC；三菱；无线控制器ABSTRACTAs the development of society and the advance in peoples living standard, More and more vehicles drive on road, meanwhile, road facilities correspond
3、ing havent got improved, which leads to the prominent of traffic jam. Whats more, traffic jams appear mainly at the gathering area of vehicles such as crossroad. How to improve the current traffic system becomes a hot point to research, and the paper revealed it deeply. Traffic light control system
4、is mainly used to process passing of vehicles and pedestrians, reducing interference between vehicles and to promote the traffic capacity. The paper summarized the development of traffic light control technology and discussed the feasibility of crossroad traffic signal light control system based on
5、PLC. According to the PLC work principle and practical situation of crossroad, the paper presents FX2N-128MT-001 of Mitsubishi Corporation as control core, making arrangements of red, yellow, green light for straight going and for left-face; red， green light on sidewalk and figure manifestation of c
6、ount down. Completed I/O port-settings and control procedure of PLC. The paper also searched the project of crossroad traffic signal light based on infrared remote control and designed the specific hardware circuit and software control programs. Keywords: crossroad; traffic light; PLC; Mitsubishi Corporation; remote controller
