摘要：随着我国社会经济的不断发展，交通问题已成为一个不容忽视的突出问题。随着我国人口压力的不断加大，现代化需求的加剧，城市化的日益扩大，交通是否便利是衡量我国城市生活水平和投资环境的重要指标之一。我国大部分交通信号系统都采用了定时控制系统。然而，由于其低交通效率和交通拥挤，本文以PCL技术为研究重点，旨在研究和设计一种基于PCL技术的有效的交通控制信号灯系统。该系统可以改善交通信号控制系统，特别是拥挤的交通信号控制系统，维护行车秩序和安全。关键词：PLC；交通信号灯；控制共页第页ABSTRACTAbstract:WiththecontinuousdevelopmentofChina'ssocialeconomy,thetrafficproblemhasbecomeaprominentproblemthatcannotbeignored.AsChina'spopulationpressurecontinuestoincrease,thedemandformodernizationintensifies,andurbanizationexpandsdaybyday,oneofthemostimportantevaluationindexesofurbanlivingstandardandinvestmentenvironmentinChinaiswhetherthetransportationisconvenientornot.ThetimingcontrolsystemisusedinmostofthetrafficsignalsystemsinChina.However,duetoitslowtrafficefficiencyandtrafficcongestion,thispaperfocusesonPCLtechnologyandaimstostudyanddesignaneffectivetrafficcontrollightsignalsystembasedonPCLtechnology.Thissystemcanimprovethetrafficsignalcontrolsystem,whichisespeciallycrowded,andmaintaintheorderandsafetyoftravel.Keywords:PLC;Trafficlights;control共页第页目录中文摘要..............................................................................................................1ABSTRACT.........................................................................................................2目录.....................................................................................................................3第一章绪论.........................................................................................................51.1城市交通信号控制系统的发展现状.....................................................61.1.1国外交通信号控制机的现状.......................................................61.1.2中国交通信号控制系统的现状...................................................71.2课题研究意义.........................................................................................8第二章PLC的相关概论.....................................................................................92.1PCL简介................................................................................................92.2PLC的基本结构...................................................................................102.3PLC的工作原理..................................................................................11第三章PLC控制系统设计原则和设计步骤.................................................133.1设计原则...............................................................................................133.2设计步骤...............................................................................................143.3交叉口信号的设置...............................................................................163.3.1交通信号灯的设置依据.............................................................163.4系统的硬件总体设计...........................................................................183.4.1PLC的选型................................................................................183.4.2PLC的I/O分配及外部接线.....................................................193.4.3车辆检测电路....................................................
