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State?IV?and?Beijing?IV?Emission?Regulations?have?very?strict?requirements?for?control?of?fuel?vapor?emission.?The?quantityof?pollutant?discharged?should?not?exceed?0.05g/L?during?refueling.?The?emission?limit?for?M1,M2?and?M3?vehicles?are?0.65g/test.To?meet?the?requirement?of?the?regulations,?the?vehicles?shall?be?optimized?based?on?its?original?EVAP?system,?i.e.,?enhanced?EVAP?system.?The?system?can?reduce?the?evaporative?emission?of?fuel?vapor?and?implement?self?diagnostic?function?for?fuel?vapor?leakage.?Enhanced?EVAP?system?consists?of?ORVR?system?and?OBDII-based?leak?detection?system.?ORVR(short?for?Onboard?Refueling?Vapor?Recovery).?A?kind?of?vehicle?emissions?control?system.?Can?collect?the?fuel?vapor?from?fuel?tank?during?refueling.?The?fuel?vapor?in?fuel?tank?will?be?absorbed?by?carbon?canisterduring?refueling.?So?that?it?will?not?overflow?from?filler?neck.?After?the?engine?is?running,?the?fuel?vapor?absorbed?in?the?carbon?canister?will?enter?into?the?engine?via?intake?manifold?for?combustion,?accompanying?with?the?fresh?air.?Enhanced?EVAP?system?with?ORVR?consists?of?fuel?tank,?fuel?pump?assembly,?GVV?valve,?FLVV?valve,?ICV?valve,?carbon?canister,?filler?tube,?canister?vent??valve,?canister?purge?valve?and?pipeline,?etc.?The?difference?between?ORVR?system?and?traditional?fueltank?system?without?ORVR?include:?1.?For?ORVR?system,?the?carbon?canister?volume?shall?increase?to?absorb?the?fuel?vapor?completely?during?refueling,?Different?to?1L?carbon?canister?volume?of?traditional?system,?ORVR?system?requires?about?2L?carbon?canister?volume,?The?specific?volume?of?carbon?canister?depends?on?fuel?tank?size.?2.?FLVV?valve?is?added,?to?control?fuel?charge?and?achieve?mass-flow?exhaust?function.?3.?The?inside?diameter?of?filler?tube?is?required?to?decrease?to?approximately?25.4mm,?The?purpose?is?to?form?a?liquid?level?seal?during?refueling?to?prevent?fuel?vapor?evaporation.?The??vent?system?is?improved:?FLVV?valve?is?used?to?achieve?the?mass-flow?exhaust,?so?that?the?fuel?vapor?can?enter?into?carbon?canister?rapidly?during?refueling;?and?the?exhaust?pipe?apertureis?over?12mm?in?general.?In?addition,?the?design?of?vapor?circulation?pipeline?can?be?added?to?circulate?partial?vapor?through?the?pipeline?during?refueling?and?reduce?the?impact?of?fuel?vapor?on?carbon?canister.
OBDII-based?leak?detection?system.

After?the?engine?is?running,?EMS?will?control?the?opening?of?canister?vent?valve?and?canister?purge?valve?and?the?fuel?vapor?absorbed?by?the?carbon?canister?will?enter?into?the?engine?for?combustion?accompanying?with?the?fresh?air.However,?the?damage?of?a?component?in?the?system,?e.g.,?air?leakage?of?fuel?tank?or?carbon?canister?and?loose?pipeline?due?to?ageing,?willresult?in?system?leakage.Cause?environmental?pollution.OBDII-based?leak?detection?system?can?detect?whether?the?evaporative?emission?system?operate?in?a?safe?and?reliable?way?irregularly.OBDII-based?leak?detection?system?can?achieve?the?system?self-diagnostic?function?with?addition?of?one?vapor?pressure?sensor?on?the?basis?of?ORVR.The?leak?detection?system?can?detect?the?system?leakage?with?1mm?and?0.5mm?in?size.In?Use?(Monitor)?Performance?Ratio?limit?for?1mm?aperture?is?required?as?0.52,In?Use?(Monitor)?Performance?Ratiolimit?for?0.5mm?aperture?is?required?as?0.26.If?the?system?leakage?is?detected,?EMS?will?trigger?and?turn?on?OBDII?alarm?indicator?lamp.Notify?the?system?failure?exists?to?the?driver?in?an?intuitive?way.The?systemself-diagnostic?function?can?be?realized?in?many?ways.?The?following?is?two?leak?detection?methods:?EONV?and?VBEM,EONV?is?short?for?Engine?Off?Natural?Vacuum.After?a?vehicle?engine?off,The?fuel?temperature?in?the?tank?may?be?higher?than?the?environment?temperature.The?fuel?vapor?volatilizes?continuously,In?the?sealed?fuel?tank?system,?the?system?pressure?will?rise?to?forma?positive?pressure?environment.Also,?when?a?vehicle?engine?off?and?parks?in?the?shade.After?the?fuel?tank?temperature?reduces,?the?fuel?vapor?will?condense?into.Detailed?principle?of?EONV?is?described?as?follows?based?on?the?principles?above?andin?combination?with?the?chart.After?a?vehicle?stops,?CVS?valve?and?CPV?valve?will?close,?and?if?the?pressure??drops?rapidlyand?reaches?the?preset?threshold,?the?judgment?result?of?leak?detection?is?qualified.If?the?fuel?vapor?pressure?fails?toreach?the?preset?threshold?rapidly?in?the?detection?process,?open?CVS?valve?keep?the?relatively?balanced?pressure?in?fuel?tankand?air.After?the?balance?is?reached,?close?CVS?valve,?and?if?the?pressure?drops?to?the?negative?pressure?threshold?afteraperiod?of?time,?the?judgment?result?of?leak?detection?is?qualified.Otherwise,?the?leak?exists.If?the?leak?exists?in?evaporative?emission?system,?the?pressure?curve?change?will?be?small.Another?detection?method?is?VBEM?(short?for?Vacuum-Based?EVAP?System).After?vehicle?cold?start,?open?CVS?valve?and?CPV?valve?to?generate?vacuum?of?EVAP?system?by?use?of?engine?vacuum?condition?and?then?close?them?rapidly.Similar?to?EONV?method,?the?vacuum?pressure?is?measured?by?pressure?sensor?in?the?sealed?EVAP?system,?and?if?the?pressure?still?remains?in?a?certain?vacuum?threshold?range?after?a?period?of?time,?EVAP?system?will?be?regarded?as?a?sealed?system.
The?leak?detection?result?is?qualified-
Otherwise,?the?leak?exists.Leak?detection?system?of?plug-in?vehicle.EVAP?system?of?plug-in?vehicle?is?more?complex?than?EVAP?system?of?low-pressure?fuel?tank.Plug-in?vehicle?has?two?kinds?of?driving?modes,?i.e.,?fuel?driven?mode?and?electric?drive?mode.If?the?vehicle?runs?in?electric?drive?mode?for?a?long?term,?there?is?no?engine?purge?environment.EVAP?system?will?generate?a?lot?of?fuel?vapor.Such?fuel?vapor?will?always?flow?to?the?carbon?canister?under?the?uncontrolled?conditions?and?will?be?discharged?into?the?atmosphere?directly?after?the?carbon?canister?is?saturated,?so?it?fails?to?meet?the?regulatory?requirements.Therefore,?an?fuel?tank?isolation?valve?is?required?to?seal?the?fuel?vapor?in?the?tank.When?compared?with?the?traditional?low-pressure?fuel?tank,?plug-in?vehicle?runs?under?the?electric?drive?mode?for?a?long?term.The?pressure?of?fuel?vapor?in?the?tank?rises?continuously?to?above?35kPa.So?the??tank?shall?be?reinforced?by?use?of?internal?stiffener?and?support?frame.As?for?leak?detection?method,?In?Use?(Monitor)?Performance?Ratio?can?not?meet?the?regulatory?requirements,?if?only?EONV?method?or?VBEM?method?is?applied?for?leak?detection.Therefore,?a?module?capable?of?generating?vacuum?or?pressure?shall?be?added?in?the?OBDII-based?leak?detection?system?of?plug-
in?vehicle,?to?create?the?pressure?environment?necessary?to?leak?detection.In?addition,?it?is?required?to?judge?whether?thefuel?tank?system?leak?exists?in?combination?with?the?similar?method,?e.g.,?EONV.The?main?function?of?fuel?tank?isolation?valve?on?plug-in?vehicle?is?to?isolate?the?fuel?vapor?in?thetank.Considering?the?fuel?tank?safety?and?refueling?waiting?time?and?other?factors.Specific?functions?are?shown?as?follows.If?the?fuel?tank?pressure?is?higher?than?a?certain?value,?the?first?safety?release?valve?will?open?and?the?fuel?vapor?will?flow?from?tank?side?to?canister?side,?to?prevent?the?fuel?tank?from?burst?dueto?excess?pressure?in?the?tank.If?the?fuel?tank?pressure?is?lower?than?a?certain?value,?the?second?safety?release?valve?will?open?and?the?fuel?vapor?will?flow?into?the?fuel?tank?via?carbon?canister?from?the?air?intake?pipeline?of?carbon?canister,to?prevent?the?oil?tank?from?collapse?due?to?excess?vacuum?in?the?tank.In?case?of?vehicle?refueling,?the?solenoid?valve?of?fuel?tank?isolation?valve?will?open?and?the?fuel?vapor?will?be?discharged?into?the?carbon?canister?at?a?controlled?rate,?toreduce?the?refueling?waiting?time.In?conclusion,?the?traditional?low-temperature?fuel?tank?shall?be?equipped?with?ORVR?system?and?OBD?pressure?sensor?to?meet?the?relevant?regulatory?requirements?.The?fuel?tank?of?plug-in?vehicle?shall?withstand?35kPa,?so?OBD?pressure?sensor,?FTIV?valve?and?pump?module?capable?of?generating?positive?pressure?or?negative?pressure?shall?be?provided.In?the?fuel?tank?system,?OLIVE?can?offer?the?following?products:?filler?tube?assembly,?carbon?canister?assembly,?ICV?valve,?GVV?valve,?OBD?pressure?sensor,?on-demand?fuel?pressure?sensor,?FTIV?valve,?fuel?tank?metal?chuck?and?fuel?tank?accessories,?etc.In?the?fuel?pump?assembly,?the?products?consist?of?flange,?float?and?liquid?level?sensor,?etc.OLIVE?is?specialized?in?developing?the?components?and?parts?of?fuel?tank?system?and?offering?the?system-level?solution?for?customer.

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