MCGS交通灯控制系统中英文对照外文翻译文献Word下载.docx
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MCGS交通灯控制系统中英文对照外文翻译文献Word下载.docx
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DesignoftrafficlightcontrolsystembasedonMCGS
Abstract:
Onekindoftrafficlightcontrolsystemusingprogrammablelogiccontroller(PLC),viasoftwarecontroltrafficlightsrunautomatically.Inthesystem,theoriginallineistheprograminsteadoftherelay,programmablelogiccontroller(PLC)systemhardwareandsoftwareresourcestobefairuse.NormaloperationandemergencytransportforadetaileddescriptionandfromtheEastandWestemergenciescanbemutuallylinked.Trafficsignalsystemsandtwoseven-segmentdigitaldisplayinthecountdownorder;
alsodiscussedindetailthewiringofthehardwareandPLCladder.TrafficlightsatthecrossroadsoftheremotemonitoringsystemdesignconfigurationsoftwareMCGS,real-timemonitoringoftrafficlights,greatlyimprovingthereliabilityofdatatransmission.Atthesametime,wecanconfigurethetrafficlightstochangethestatusofphotographs.
Keywords:
switchingpower,supplyprotection,circuitsystemdesign
Signalcontrolisanecessarymeasuretomaintainthequalityandsafetyoftrafficcirculation.Furtherdevelopmentofpresentsignalcontrolhasgreatpotentialtoreducetraveltimes,vehicleandaccidentcosts,andvehicleemissions.Thedevelopmentofdetectionandcomputertechnologyhaschangedtrafficsignalcontrolfromfixed-timeopen-loopregulationtoadaptivefeedbackcontrol.Presentadaptivecontrolmethods,liketheBritishMOVA,SwedishSOS(isolatedsignals)andBritishSCOOT(area-widecontrol),usemathematicaloptimizationandsimulationtechniquestoadjustthesignaltimingtotheobservedfluctuationsoftrafficflowinrealtime.Theoptimizationisdonebychangingthegreentimeandcyclelengthsofthesignals.Inarea-widecontroltheoffsetsbetweenintersectionsarealsochanged.Severalmethodshavebeendevelopedfordeterminingtheoptimalcyclelengthandtheminimumdelayatanintersectionbut,basedonuncertaintyandrigidnatureoftrafficsignalcontrol,theglobaloptimumisnotpossibletofindout.
Inadaptivetrafficsignalcontroltheincreaseinflexibilityincreasesthenumberofoverlappinggreenphasesinthecycle,thusmakingthemathematicaloptimizationverycomplicatedanddifficult.Forthatreason,theadaptivesignalcontrolinmostcasesisnotbasedonpreciseoptimizationbutonthegreenextensionprinciple.Inpractice,uniformityistheprinciplefollowedinsignalcontrolfortrafficsafetyreasons.Thissetslimitationstothecycletimeandphasearrangements.Hence,trafficsignalcontrolinpracticearebasedontailor-madesolutionsandadjustmentsmadebythetrafficplanners.Themodernprogrammablesignalcontrollerswithagreatnumberofadjustableparametersarewellsuitedtothisprocess.Forgoodresults,anexperiencedplannerandfine-tuninginthefieldisneeded.Fuzzycontrolhasproventobesuccessfulinproblemswhereexactmathematicalmodellingishardorimpossiblebutanexperiencedhumancancontroltheprocessoperator.Thus,trafficsignalcontrolinparticularisasuitabletaskforfuzzycontrol.Indeed,oneoftheoldestexamplesofthepotentialsoffuzzycontrolisasimulationoftrafficsignalcontrolinaninter-sectionoftwoone-waystreets.Eveninthisverysimplecasethefuzzycontrolwasatleastasgoodasthetraditionaladaptivecontrol.Ingeneral,fuzzycontrolisfoundtobesuperiorincomplexproblemswithmultiobjectivedecisions.Intrafficsignalcontrolseveraltrafficflowscompetefromthesametimeandspace,anddifferentprioritiesareoftensettodifferenttrafficflowsorvehiclegroups.Inaddition,theoptimizationincludesseveralsimultaneouscriteria,liketheaverageandmaximumvehicleandpedestriandelays,maximumqueuelengthsandpercentageofstoppedvehicles.So,itisverylikelythatfuzzycontrolisverycompetitiveincomplicatedrealintersectionswheretheuseoftraditionaloptimizationmethodsisproblematic.
Fuzzylogichasbeenintroducedandsuccessfullyappliedtoawiderangeofautomaticcontroltasks.Themainbenefitoffuzzylogicistheopportunitytomodeltheambiguityandtheuncertaintyofdecision-making.Moreover,fuzzylogichastheabilitytocomprehendlinguisticinstructionsandtogeneratecontrolstrategiesbasedonprioricommunication.Thepointinutilizingfuzzylogicincontroltheoryistomodelcontrolbasedonhumanexpertknowledge,ratherthantomodeltheprocessitself.Indeed,fuzzycontrolhasproventobesuccessfulinproblemswhereexactmathematicalmodellingishardorimpossiblebutanexperiencedhumanoperatorcancontrolprocess.Ingeneral,fuzzycontrolisfoundtobesuperiorincomplexproblemswithmulti-objectivedecisions.
Atpresent,thereisamultitudeofinferencesystemsbasedonfuzzytechnique.Mostofthem,however,sufferill-definedfoundations;
eveniftheyaremostlyperformingbetterthatclassicalmathematicalmethod,theystillcontainblackboxes,e.g.defuzzification,whichareverydifficulttojustifymathematicallyorlogically.Forexample,fuzzyIF-THENrules,whichareinthecoreoffuzzyinferencesystems,areoftenreportedtobegeneralizationsofclassicalModusPonensruleofinference,butliterallythisnotthecase;
therelationbetweentheserulesandanyknownmany-valuedlogiciscomplicatedandartificial.Moreover,theperformanceofanexpertsystemshouldbeequivalenttothatofhumanexpert:
itshouldgivethesameresultsthattheexpertgives,butwarnwhenthecontrolsituationissovaguethatanexpertisnotsureabouttherightaction.Theexistingfuzzyexpertsystemsveryseldomfulfilthislattercondition.
1.Introduction
Withthesocialdevelopmentandprogress,trafficflowbecomesincreasinglyimportant.Ontheonehand,toomanycrossroads,moreandmorevehicles,whicharecausingserioustrafficcongestion.Ontheotherhand,inthelimitedtimeitisnecessarytomaintainthevehicleandpedestrianfastandsafe.Therefore,onekindoftrafficlightcontrolsystemdesign,canbeusedtodisplaytimecountdown,withcomputercontrolledreal-timedata.Inaddition,theconfigurationtechnologyforreal-timeimagesthatreflectthetrafficlights,understandthehistoricalcrossroadsofworktogettrafficlightsvisualization.Thesystemconsistsofhostcomputerandalowcomputer.MCGSconfigurationisinstalledinthehostcomputerislowerbythePLCcontrolsystem.
NormaltrafficsignaltimingdiagramshowninFigure1.Buttherearesomeurgentmatters,forexample.Thereareanumberofambulancestotransportpatientstothehospitalortodealwithanumberoffireenginesandfire.Fireenginesandambulancesrushedtotakeprecedenceoverothertrafficscene.Accordingtourbantrafficcontrolsystem,undernormalcircumstances,twocontrolmethodsandurgencytrafficcontrolfactorsintoaccount.Thisprocesscanshow14segmentencoder.U.S.trafficlightsinstantrecordofthemonitoringprocess.
Emergencycontrolsignalstocontroltrafficemergencyswitch.Ifthereisnoemergencylightsallwork,butwhenanemergencyopen.Inthiscase,thecarisurgentprioritypass.Oncetheemergencyvehiclepasses,emergencyswitchoffimmediately.Thegreenlightinthesamedirectionofthevehiclequicklyflashesthreetimes,followedbythenormaloperation.Ifyouwerefromthenorth-southandeast-westtwoemergencyvehicles,trafficcontrolsystemscanrespondquicklycameearly,andthenanother.
2.TrafficControlSystemDesign
A.Hardwaredesign
CP1HseriesPLCascontroller,displaytheprocedureshouldstopwhenthetimeseriesofabnormalsystemoperation,thetimewillnotbedisplayed.Whentheemergencyproceduresarecompletedtimeseries,countdowndisplayprogramshouldbereset.At220VACsystemisusedtocontroltrafficlights,24VDCcontrolsegmentencoder,Figure2showstheschemeEasterntimedisplay.CP1Hseriesprogrammablelogiccontroller(PLC)isasimplecontroller,whichconsistsof24inputsandsixteenoutputs.BecausetheoutputtotwentyInthissystem,anI/Omodulemustbeextended.CircuitisshowninFigure2.
B.ControlProgramDesign
Sixtimersandtwospecialnormalopenpulseisusedinthissystem,thegreenlightflashesforallnorth-southandeast-timerandaspecialpulse;
eightkindsofinterlockinginternalrelayisusedtoimplementtheurgencyandtransmitpulsetwodirectionstoPLC,showninthefigure.TwoSDECinstructionsareusedtodisplaythecountdowndisplaythecorrespondinglight.Asanimportantpartofthecountdowndisplayprogram,eastandwestofthegreenlightreflectedintheview4intheseprogramsdownloadedtotheprogrammablelogiccontroller(PLC),allthetrafficlightsrunningaccuracy,urgency,andthingscanbeinterlockedfromnorthtosouthstrictly,allthelightscanbesetbacktotheurgencyofpassingstate.Therefore,thesecontrolprogramiscorrect,simple.
C.MonitoringSystem
Computersystemhastwomainfunctions:
anoutputsignalacquisitionanddisplayreal-timestatusoftheprogrammablelogiccontroller(PLC)tocontroltrafficlights,trafficlights.Anothernotificationrobotstatusandhistoryofthestatereal-timecurvebyexaminingthehistoryandalarmwindow.
ThismonitoringsystemdesignandconfigurationsoftwareMCGSconfigurationiseasy.Theserialcommunicationisimplementedasfollows.
Datainspectionmethods:
doubleended
SerialCommunicationsNumber:
COM0ended
Theminimumsamplingperiod:
200ms
ProgrammableLogicController(PLC)Theparametersaredefinedasfollows:
Theminimumsamplingperiodofthebasicproperties:
Threeread/writechannel:
X0,X1,X2
Sixread-onlyaccess(readU.S.trafficlights):
Q0-Q5
Allchannelsmustbecon
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