摘要众所周知，大型的十字路口车辆通行随机，无序，很难掌握其规律。随着社会日新月异的的飞速发展，人们对于大型交通路口系统设计的要求也越来越高，传统的交通灯定时控制系统很难再满足时代的需要。近几年来，交通信号灯的智能控制系统不断涌现，通过实时监控或者GPS定位等方法实现对大型十字路口交通灯的控制。84459

本文采用西门子S7-200系列的PLC实现十字路口交通信号信号灯的控制。铺设在十字路口各个方向的电磁传感器传回的数据差值作为PLC的输入，红绿信号灯时长作为PLC的输出。交通信号灯的控制方法为模糊控制。本文实现对大型十字路口交通信号灯的控制，达到实时疏导车流的目的。

本文首先介绍了国内外十字路口交通控制的现状，并对完成此次交通灯控制系统设计所需软硬件进行了详细的介绍，其次介绍了采用S7-200系列PLC设计出的十字路口交通信号灯控制程序，并通过组态王设计出实时监控界面，实现了动态监控显示，数据实时刷新等功能。

毕业论文关键词：西门子S7-200；模糊控制；组态；交通灯

Abstract As we all know, a large vehicle traffic intersection is random, chaotic, and difficult to master them。 With the rapid development of ever-changing society, people for a large traffic junction system design requirements have become more sophisticated, the traditional traffic light timing control system is difficult to meet the needs of the times。 In recent years, intelligent control system for traffic lights continue to emerge, for the large intersection controlled by traffic lights or GPS positioning real-time monitoring and other methods。

 In this paper, Siemens S7-200 series PLC in control intersection traffic signal lights。 Lay in all directions Crossroads electromagnetic sensor data returned as the difference between the input of the PLC, the PLC long as the output when the red and green lights。 The control method of fuzzy control traffic lights。 In this paper, for the large intersection traffic signal  control, to achieve real-time traffic grooming purposes。 

     This paper introduces the present situation of intersection traffic control, and the completion of the traffic light control system hardware and software needed to design a detailed introduction, followed by the presentation uses S7-200 series PLC to design a crossroads traffic lights control program, and designed by Kingview real-time monitoring interface, to achieve a dynamic monitoring display, real-time data refresh function。

Keywords: Siemens S7-200; fuzzy control; configuration;traffic light

目录

第一章 绪论 1

1。1课题的背景及意义 1

1。2国内外研究的现状及存在的问题 1

1。3传统交通信号灯和新型交通信号灯的对比 1

1。4传统信号灯与新型信号灯设计流程图介绍与对比 2

1。5本文主要研究内容 4

第二章 西门子S7-200系列PLC介绍及选型 5

2。1 PLC控制交通信号灯课题研究内容 5

2。2十字路口电感式传感器的设计和铺设 5

2。3 PLC的介绍 6

2。3。1 PLC定义 6

2。3。2 PLC的主要技术指标 6

2。3。3 PLC的基本功能 6

2。3。4 PLC基本结构