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StateIVandBeijingIVEmissionRegulationshaveverystrictrequirementsforcontroloffuelvaporemission.Thequantityofpollutantdischargedshouldnotexceed0.05g/Lduringrefueling.TheemissionlimitforM1,M2andM3vehiclesare0.65g/test.Tomeettherequirementoftheregulations,thevehiclesshallbeoptimizedbasedonitsoriginalEVAPsystem,i.e.,enhancedEVAPsystem.Thesystemcanreducetheevaporativeemissionoffuelvaporandimplementselfdiagnosticfunctionforfuelvaporleakage.EnhancedEVAPsystemconsistsofORVRsystemandOBDII-basedleakdetectionsystem.ORVR(shortforOnboardRefuelingVaporRecovery).Akindofvehicleemissionscontrolsystem.Cancollectthefuelvaporfromfueltankduringrefueling.Thefuelvaporinfueltankwillbeabsorbedbycarboncanisterduringrefueling.Sothatitwillnotoverflowfromfillerneck.Aftertheengineisrunning,thefuelvaporabsorbedinthecarboncanisterwillenterintotheengineviaintakemanifoldforcombustion,accompanyingwiththefreshair.EnhancedEVAPsystemwithORVRconsistsoffueltank,fuelpumpassembly,GVVvalve,FLVVvalve,ICVvalve,carboncanister,fillertube,canisterventvalve,canisterpurgevalveandpipeline,etc.ThedifferencebetweenORVRsystemandtraditionalfueltanksystemwithoutORVRinclude:1.ForORVRsystem,thecarboncanistervolumeshallincreasetoabsorbthefuelvaporcompletelyduringrefueling,Differentto1Lcarboncanistervolumeoftraditionalsystem,ORVRsystemrequiresabout2Lcarboncanistervolume,Thespecificvolumeofcarboncanisterdependsonfueltank>OBDII-basedleakdetectionsystem.

Aftertheengineisrunning,EMSwillcontroltheopeningofcanisterventvalveandcanisterpurgevalveandthefuelvaporabsorbedbythecarboncanisterwillenterintotheengineforcombustionaccompanyingwiththefreshair.However,thedamageofacomponentinthesystem,e.g.,airleakageoffueltankorcarboncanisterandloosepipelineduetoageing,willresultinsystemleakage.Causeenvironmentalpollution.OBDII-basedleakdetectionsystemcandetectwhethertheevaporativeemissionsystemoperateinasafeandreliablewayirregularly.OBDII-basedleakdetectionsystemcanachievethesystemself-diagnosticfunctionwithadditionofonevaporpressuresensoronthebasisofORVR.Theleakdetectionsystemcandetectthesystemleakagewith1mmand0.5mmin>Theleakdetectionresultisqualified-
Otherwise,theleakexists.Leakdetectionsystemofplug-invehicle.EVAPsystemofplug-invehicleismorecomplexthanEVAPsystemoflow-pressurefueltank.Plug-invehiclehastwokindsofdrivingmodes,i.e.,fueldrivenmodeandelectricdrivemode.Ifthevehiclerunsinelectricdrivemodeforalongterm,thereisnoenginepurgeenvironment.EVAPsystemwillgeneratealotoffuelvapor.Suchfuelvaporwillalwaysflowtothecarboncanisterundertheuncontrolledconditionsandwillbedischargedintotheatmospheredirectlyafterthecarboncanisterissaturated,soitfailstomeettheregulatoryrequirements.Therefore,anfueltankisolationvalveisrequiredtosealthefuelvaporinthetank.Whencomparedwiththetraditionallow-pressurefueltank,plug-invehiclerunsundertheelectricdrivemodeforalongterm.Thepressureoffuelvaporinthetankrisescontinuouslytoabove35kPa.Sothetankshallbereinforcedbyuseofinternalstiffenerandsupportframe.Asforleakdetectionmethod,InUse(Monitor)PerformanceRatiocannotmeettheregulatoryrequirements,ifonlyEONVmethodorVBEMmethodisappliedforleakdetection.Therefore,amodulecapableofgeneratingvacuumorpressureshallbeaddedintheOBDII-basedleakdetectionsystemofplug-
invehicle,tocreatethepressureenvironmentnecessarytoleakdetection.Inaddition,itisrequiredtojudgewhetherthefueltanksystemleakexistsincombinationwiththesimilarmethod,e.g.,EONV.Themainfunctionoffueltankisolationvalveonplug-invehicleistoisolatethefuelvaporinthetank.Cons>
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