十字路口交通灯PLC毕业设计

青岛求实职业技术学院

毕业设计设计课题 PLC交通灯设计

院系机电工程学院

专业机电一体化

班级______________

学生姓名______________

指导教师______________

完成日期2011年3 月1日

目录

摘要--------------------------------------------------------------------------------------------3 第一章：引言--------------------------------------------------------------------------------5 第二章：交通灯控制系统-----------------------------------------------------------------5 第三章：可编程控制器程序设计--------------------------------------------------------------9 第四章：总结-------------------------------------------------------------------------------22 第五章：结束语----------------------------------------------------------------------------24 第六章：致谢-------------------------------------------------------------------------------25 第七章：参考文献-------------------------------------------------------------------------26

摘要

分析了现代城市交通控制与管理问题的现状，结合城乡交通的实际情况阐述了交通灯控制系统的工作原理，给出了一种简单实用的城市交通灯控制系统的硬件电路设计方案。随着社会经济的发展，城市交通问题越来越引起人们的关注。人、车、路三者关系的协调，已成为交通管理部门需要解决的重要问题之一。城市交通控制系统是用于城市交通数据监测、交通信号灯控制与交通疏导的计算机综合管理系统，它是现代城市交通监控指挥系统中最重要的组成部分。随着城市机动车量的不断增加，许多大城市如北京、上海、南京等出现了交通超负荷运行的情况，因此，自80年代后期，这些城市纷纷修建城市高速道路，在高速道路建设完成的初期，它们也曾有效地改善了交通状况。然而，随着交通量的快速增长和缺乏对高速道路的系统研究和控制，高速道路没有充分发挥出预期的作用。而城市高速道路在构造上的特点，也决定了城市高速道路的交通状况必然受高速道路与普通道路耦合处交通状况的制约。所以，如何采用合适的控制方法，最大限度利用好耗费巨资修建的城市高速道路，缓解主干道与匝道、城区同周边地区的交通拥堵状况，越来越成为交通运输管理和城市规划部门亟待解决的主要问题。为此，通过我应用所学的知识设计了一套交通灯控制电路的方案。交通灯的控制系统主要由计时电路、主控电路、信号灯转换器、脉冲信号发生器组成。

关键词：计时电路、主控电路、信号灯转换器、脉冲信号发生器

Abstract:

Has analyzed the modern municipal transportation control and themanagement question present situation, unified the city andcountryside transportation the actual situation to elaborate thetraffic light control system principle of work, has produced one kindof simple practical city traffic light control system hardware circuitdesign plan. Along with the social economy development, the municipaltransportation question more and more arouses people's interest. The person, the vehicle, the road three relations coordinations, havebecome one of important questions which the traffic control departmentneeds to solve. The municipal transportation control system is uses inthe computer synthesis management system management system which themunicipal transportation data monitor, the street-traffic controllights control and the transportation unblocks, it is in the modernmunicipal transportation monitoring command system the most importantconstituent. Along with the city vehicle quantity unceasing increase, many bigcities like Beijing, Shanghai, Nanjing and so on had thetransportation excess load movement situation, therefore, from the80's later periods, these cities constructs the city speed-way inabundance, completes the initial period in the speed-way construction,they also once effectively improved the transportation condition. However, and lacks along with the volume of traffic fast growth to thespeed-way system research and the control, the speed-way not fullyplays the anticipated role. But city speed-way in structurecharacteristic, also had decided the city speed-way transportationcondition inevitably receives the speed-way and the ordinary pathcoupling place transportation condition restriction. Therefore, how uses the appropriate control method, maximum limit usesthe good consumption large amount of money construction the cityspeed-way, alleviates branch with Ramp , the city supports with theperipheral locality transportation stops up the condition, more andmore becomes the main question which the transportation management andthe urban planning department urgently awaits to be solved. Therefore, applied the knowledge through me which studied to design aset of traffic lights control circuit plan. The traffic light controlsystem mainly by the timing circuit, the host controls the electriccircuit, the signal light switch, the pulse signal generating deviceis composed.

Key word: The timing circuit, the host control the electric circuit,the signal light switch, the pulse signal generating device