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1摘要城市交通信号控制是通过对交通流量的调节以达到改善人和货物的安全运输，提高运营效率。交通系统是一个具有随机性、模糊性和不确定性的复杂系统，建立数学模型非常困难，有时甚至无法用现有的数学方法加以描述。目前大多采用的是自适应信号控制，它需要数学建模，且不考虑交通延误、停车次数等。所以经典控制法很难得到满意的效果。而模糊控制是一种无须建立数学模型的控制方法，它能模仿有经验的交警指挥交通时的思路，达到很好的控制效果。近些年来我国的许多学者也都以不同的思路对单个交叉口、交通干线的模糊控制进行了研究，但因研究的局限性，实际中得到应用的寥寥无几，本文实现基于PLC的交通信号的模糊控制系统。根据前后相流量来决定信号灯配时的模糊控制系统的理论研究成果，用PLC实现单个十字路口交通信号灯模糊控制的方法，以单个十字路口4相位交通灯为例，把PLC作为一个模糊控制器，采用梯形图编程。通过实验保证了系统运行稳定可靠，能根据不同的交通流量进行模糊控制决策，优化信号灯的配时，从而可以有效的解决交通流量不均衡、不稳定带来的问题。关键词：交通;智能控制;PLC2AbstractThemunipaltransportationsignalcontrolisthroughtheadjustment，thewaningandtheinductionwhichflowstothetransporationachievedimprovesthepersonandthecargosafetransportation,enhancigtheoperationefficiency.Transportsystemisarandomnature,ambiguityanduncertaintyofcomplexsystems,theestablishmentofmathematicalmodelsverydifficultandsometimesimpossbletouseexistingmathematicalmethodsdescribed.themostadaptivesignalcontrolisused,itneedsmathematicalmodel,withoutconsideringtrafficdelays,Andvaguecontrolisamathematicalmodeltocontrolmethods,itcanimitateexperiencedpolicedirectingtraffic,ideas,achievegoodcontrolresults.Inrecentyearsmanyofourscholarshavedifferentideasofindividualjunction,trafficcontrolRoutevaguestudied,butthelimitationsofthetheoryandresearchscholars,thefewpracticalapplications,basedonthisachievementtrafficsignalsvaguePLCcontrolsystem.Accordingtodeterminesignaldistributionandflowofthecontrolsystemvaguetheoreticalresesrchresults,theachievementofindividualintersectionswithtrafficlightsblurPLCcontrolmethodsforindividualcrossroads4phaseoftrafficlights,forexample,thePLCasanambiguoussignalcontrollersusingLadderprogramming.throughexperimentsthatthereliableoperationofthesystemtoavagueunderdifferenttrafficcontroldecision-making,optimizesignaldistribution,whichcaneffectivelysolvetrafficimbalance,instabilitybrought.Keywords：Transportation;Intelligentcontrol;PLC3目录摘要..............................................................................................................................1Abstract...............................................................................................................................2目录................................................................................................................................31绪论................................................................................................................................41.1城市交通现状......................................................................................................41.2智能交通的国内外发展状况..............................................................................41.3交通信号灯控制的研究现状..............................................................................61.4本文的主要工作..................................................................................................82十字路口信号控制的基本理论和方法.........................................................................92.1交通信号灯.........................................................................................................92.2信号灯的设置......................................................................................................92.3交通信号的控制方式........................................................................................102.4城市道路智能交通信号控制系统.....................................................................112.4.1智能交通信号控制系统的基本组成......................................................112.4.2交通信号控制系统的主要术语和参数.................................................122.4.3智能交通信号控制的核心...................................................................152.4.4智能交通信号控制系统的基本设计步骤.............................................153模糊控制......................................................................................................................163.1控制理论的发展与模糊控制理论的提出........................................................163.2模糊控制的一般原则及与传统控制的关系....................................................173.3十字路口交通灯的控制策略............................................................................203.4交叉口停车线的设计........................................................................................254基于PLC的模糊控制系统的设计实现.....................................................................284.1可编程控制器....................................................................................................284.2硬件电路...........................................................................................................304.3PLC的编程设计................................................................................................344.5软、硬件的调试................................................................................................374.6系统的性能.......................................................................................................395结论..............................................................................................................................41参考文献.............................................................................................错误!未定义书签。41绪论1.1城市交通现状据一项对美国主要城市交通状况的调查显示：1982年至2000年，美国城市在上下