交通灯外文翻译(共6页).doc

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1、精选优质文档-倾情为你奉上 Traffic lights and PLC With economic development, increased the number of vehicles, road congestion is becoming increasingly serious, intelligent traffic lights on the emerged. At present, the worlds Intelligent Transportation System will be: a huge structure, management difficulties,

2、such as the maintenance of large inputs. In order to improve the existing traffic conditions, and to overcome the existing shortcomings of intelligent transportation system I designed analog control traffic lights in urban and rural areas of small-scale smart traffic lights. It has small size, intel

3、ligence, maintenance into small, easy to install and so on. And other intelligent transportation system compared to the system to adapt to economic and social development, in line with the current status of scientific and technological development. Intelligent traffic lights are a comprehensive use

4、of computer network communication technology, sensor technology to manage the automatic control system of traffic lights. Urban traffic control system is used for urban traffic data monitoring, traffic signal control and traffic management computer system; it is the modern urban traffic control syst

5、em command and the most important component. In short, how to use the appropriate control method to maximize the use of costly cities to build high-speed roads, trunk road and the ramp to alleviate urban areas with the neighboring state of traffic congestion has become more and more traffic manageme

6、nt and urban planning departments need to address the the main problem. Nowadays,trafficlightsinstalledineachcrossing,hasbecomethemostcommonanddredgethetraffic,themosteffectivemeans.Thedevelopmentofthesociety,peoplesconsumptionlevelunceasingenhancement,privatevehiclesunceasingincrease.Andmorecarsroa

7、dsarenarrowroadtrafficisclear.Soadoptingeffectivemethodtocontrolthetrafficlightisimperative.PLCintelligentcontrolprincipleisthecoreofthecontrolsystem,PLCputthethingsdirectionornorth-southdirectionaccordingtoquantityofvehicles,thecorrespondingscalewhatdividesclassgiventhegreenlightdirectionbetweennor

8、thandsouthdirectionaccordingtocertainrulestoolong.Itcanrealizedividesclassaccordingtoagiventhegreencarsdurationscaleofmaximumcarrelease,reducecrossroadsvehicles,easetrafficcongestionstagnation,realizetheoptimalcontrol,soastoimprovetheefficiencyofthetrafficcontrolsystem.TheapplicationofPLCiscontinuou

9、sly,anddrivetothedeepeningtraditionalcontroltestnewmonthbenefitupdates.Itissimpleinstructure,programmingandhighreliabilityetc,convenientalreadywidelyusedinindustrialprocessesandpositionintheautomaticcontrol.DuetouseofPLChasthecharacteristicsofenvironmentaladaptable,anditsinternaltimerisveryrichinres

10、ources,butthecurrentwidelyusedprogressivelights,especiallyforprecisecontrolmorethanthe crosswaycontrolcanbeeasilyrealized.SonowincreasinglyapplyingPLCtrafficlightsystem.Meanwhile,PLCitselfalsohascommunicationnetworkingfunction,willthesamepathaspartofaLANsignalunifieddispatchingmanagement,canshortent

11、hetrafficwaittimes,realizescientificmanagement.Inreal-timedetectionandautomaticcontrolofPLCapplicationsystem,PLCisoftenusedasacorecomponents.Inthe21stcentury,PLCwillhavegreaterdevelopment.Technically,thecomputertechnologycanmorelynewachievementsusedinprogrammablecontrollerdesignandmanufacturing,ther

12、ewillbefaster,storageandlargercapacity,intelligentstrongervarietiesappear;Lookfromproductsize,canfurthertominiandsuper-largedirection;Lookfromproductcompatibility,thevarietyofourproductswillbemorerich,specificationmorecomplete,perfectman-machineinterfaceandcompletecommunicationequipmentcanbetteradap

13、ttoallkindsofindustrialcontroloccasiondemands;Lookfromthemarket,allcountriestotheirproductionofmultipleproductswithinternationalcompetitionintensifiesandbreak,canappearafewbrandmonopolyinternationalmarketsituation,canappearinternationalgeneralprogramminglanguages;Judgingfromthedevelopmentofthenetwor

14、k,programmablecontrollerandotherindustrialcontrolcomputernetworkingconstitutealargecontrolsystemisprogrammablecontrollertechnologydevelopmentdirection.ThecurrentcomputerdistributedcontrolsystemDCShasalreadyalotofprogrammablecontrollerapplications.Alongwiththedevelopmentofcomputernetwork,theprogramma

15、blecontrollerasautomationcontrolnetworkandinternationalgeneralnetworkwillbeanimportantpartoftheindustryandindustry,thenumerousfieldsoutsideplayanincreasingrole.InChinatheincreasingamountofmotorvehicles,manybigcitieslikeBeijing,Shanghai,nanjingandothergroundappearedtraffic overloadrunningcondition,tr

16、afficaccidentsproblemalsomoreandmoreserious.Andbecausethevariousspecialvehicles(suchasanambulance,119120car,policeandvariousspecialvehicle110inemergencysituations,byredunderlimitedtotrafficbringalotofinconvenience,evencausetrafficaccident.Andnow,mosttrafficlightsatthesamemomentwillappeartwoormoretha

17、ntwodirectionatthesametimeforthegreensituation,andincreasetheincidenceofthetrafficaccident.Therefore,designakindofdesignedforspecialvehiclesthroughandnotcauseanytrafficaccident,normaltrafficcontrolanytimeonlyonedirectionofmodernintelligenttrafficlightgreentrafficcontrolsystemisurgentlyneeded. 交通灯与PL

18、C随着经济的发展，车辆的数目不断增加，道路堵车现象日益严重，智能交通灯就应运而生了。目前世界上的智能交通系统存在的问题是：系统结构庞大、管理困难、维护投入大等。为了改善现有的交通状况，并克服现有智能交通系统的缺点我设计了城乡交通灯模拟控制小型化的智能交通灯。它具有小型化、智能化、维修投入小、易于安装等特点。与其他的智能交通系统相比该系统更适应经济和社会的发展，符合目前科技发展的现状。 智能交通灯是一项综合运用网络通讯计算机技术、感应技术来管理交通灯具的自动控制系统。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

19、分。总之，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。当今，红绿灯安装在各个道口上，已经成为疏导交通车辆最常见和最有效的手段。社会的发展，人们的消费水平不断的提高，私人车辆不断的增加。人多、车多道路窄的道路交通状况已经很明显了。所以采用有效的方法控制交通灯是势在必行的。PLC的智能控制原则是控制系统的核心，采用PLC把东西方向或南北方向的车辆按数量规模进行分档，相应给定的东西方向与南北方向的绿灯时长也按一定的规律分档.这样就可以实现按车流量规模给定绿灯时长，达到最大限度

20、的有车放行，减少十字路口的车辆滞流，缓解交通拥挤、实现最优控制，从而提高了交通控制系统的效率.PLC的应用正在不断地走向深入，同时带动传统控制检测日新月益更新。它具有结构简单、编程方便、可靠性高等优点，已广泛用于工业过程和位置的自动控制中。由于PLC具有对使用环境适应性强的特性，同时其内部定时器资源十分丰富，可对目前普遍使用的“渐进式”信号灯进行精确控制，特别对多岔路口的控制可方便地实现。因此现在越来越多地将PLC应用于交通灯系统中。同时，PLC本身还具有通讯联网功能，将同一条道路上的信号灯组成一局域网进行统一调度管理，可缩短车辆通行等候时间，实现科学化管理。在实时检测和自动控制的PLC应用系

21、统中，PLC往往是作为一个核心部件来使用。.21世纪，PLC会有更大的发展。从技术上看，计算机技术的新成果会更多地应用于可编程控制器的设计和制造上，会有运算速度更快、存储容量更大、智能更强的品种出现；从产品规模上看，会进一步向超小型及超大型方向发展；从产品的配套性上看，产品的品种会更丰富、规格更齐全，完美的人机界面、完备的通信设备会更好地适应各种工业控制场合的需求；从市场上看，各国各自生产多品种产品的情况会随着国际竞争的加剧而打破，会出现少数几个品牌垄断国际市场的局面，会出现国际通用的编程语言；从网络的发展情况来看，可编程控制器和其它工业控制计算机组网构成大型的控制系统是可编程控制器技术的发展

22、方向。目前的计算机集散控制系统DCS中已有大量的可编程控制器应用。伴随着计算机网络的发展，可编程控制器作为自动化控制网络和国际通用网络的重要组成部分，将在工业及工业以外的众多领域发挥越来越大的作用。在中国机动车量的不断增加，许多大城市如北京、上海、南京等地出现了交通超负荷运行的情况，交通事故的问题也越来越严重。并且由于各种特殊车辆（如120急救车、119火警车、110警车及各种特种车辆）在紧急情况之下不受红灯限制，也给交通带来很多不便，甚至造成交通事故。而且，目前大多数交通灯在同一时刻都会出现两个或两个以上方向同时为绿灯的情况，也增加了交通事故的发生率。因此，设计一种专为特殊车辆通过而不至于引发任何交通事故、正常交通控制时任何时刻只有一个方向通行绿灯的现代化智能交通灯控制系统是迫切需要的。专心-专注-专业