摘要随着社会经济的大力发展，人们的水平也有所提高，私家车也开始变得很普遍，一件事情有利就有弊,这样导致交通问题在国家经济发展中日益突出，道路的通畅，成为衡量一个城市的发展标准。现实道路中，车流量随着时间段的不同，会出现很随机性、非线性的状态，传统的固定时间控制的信号灯是无法满足现在的交通状况的，使得我们有必要寻求一种智能化的交通信号控制系统。

根据各十字路口的要求，本设计利用PLC（可编程控制器）控制十字路口交通灯的延时系统及各个方向的倒计时，利用环形线圈车辆检测器来探测道路上车辆的通过，利用PLC内部的计数器对各个方向的车流量进行计数,以达到合理调整各个方向的时间。利用工控组态来监测整个交通画面的运行状态，实现交警对交通系统的智能控制及监测，以此来缓解交通压力，提高通行效率。75054

该论文有图31幅，表3个，参考文献20篇。

毕业论文关键字：可编程控制器  智能交通  车辆检测器  工控组态

The Traffic Signal Control System Based on PLC 

Abstract With the development of social economy, the life of people are improved and private cars are becoming common。 As every coin has two sides, so does it。 This leads to the traffic problem increasingly prominent in the national economic development。 The traffic condition becomes a standard measure of a city's development。 Traffic can appear very randomness, nonlinear state as the time is different。 The traditional control signal which time is fixed cannot meet the needs of current traffic situation, which makes it necessary to seek a kind of intelligent traffic signal control system。

According to the requirements of each intersection, this design uses PLC (programmable controller) to control the time delay of the intersection traffic lights system and the countdown in all directions。 It uses the annular coil vehicle detector to detect the adoption of the cars on the road 。It makes use of PLC internal counter to count of all directions of traffic to achieve a reasonable adjustment in all directions。 Using the industrial control configuration monitors the operating state of the whole traffic 。 It can let  traffic police control and monitor the traffic system of intelligent, in order to alleviate traffic pressure and improve the traffic efficiency。 

The paper has 31 figures, 3 tables and 20 references。

Key words: PLC  intelligence traffic  vehicle detector  industrial control configuration

目  录

摘要 I

Abstract II

1绪论 1

1。1背景及意义 1

1。2 国内外现状 2

1。3本文设计的内容 2

2 系统硬件设计 3

2。1 系统的控制要求 3

2。2 PLC的选择 6

2。3 直流稳压电压源 9

2。4 信号灯的选择 10

2。5 车辆检测器的选择 10

3 系统软件设计 12

3。1 PLC控制系统软件实现流程图 12

3。2 信号系统的PLC软件编程 12

3。3 监控画面软件 18

4 系统调试