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;PLCAbstractThemunipaltransportationsignalcontrolisthroughtheadjustment，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;PLC目录摘要..................................................................................................................................1Abstract...............................................................................................................................2目录...................................................................................................................................31绪论..................................................................................................................................31.1城市交通现状.......................................................................................................31.2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.....
