车辆工程内燃机燃油供应系统中英文对照外文翻译文献Word下载.docx

车辆工程内燃机燃油供应系统中英文对照外文翻译文献Word下载.docx

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FuelSupplySystemForAnInternalCombustionEngine

Abstract

Apulsationdamperisprovidedbetweenandinserieswithalowpressurefuelsystempipeandahighpressurepumpofafuelsupplysystem.Duringstartupofanengine,lowpressurefuelsuppliedviathelowpressurefuelsystempipeisinjectedfromanintakepassagefuelinjector.Whenthefuelpressureisequaltoorlessthanafuelpressureatwhichgoodstartabilitycanbemaintained,thepulsationdamperclosesoffcommunicationbetweenthehighpressurefuelsystempipeandthelowpressurefuelsystempipeusingthespringforceofaspring.

Keywords:

Fuelsupplysystem;

Aninternalcombustionengine;

Apulsationdamper;

Alowpressurefuelsystempipeandahighpressurepump;

Afuelsupplysystemforaninternalcombustionengine,comprising:

alowpressurepumpthatiscapabletopressurizefuel;

alowpressurefuelsupplypassagethatiscapabletosupplyfuelthatwaspressurizedbythelowpressurepumptoalowpressurefuelinjectionmechanismwhichinjectsfuelintoanintakepassage;

abranchpassagethatbranchesofffromthelowpressurefuelsupplypassageandthroughwhichthefuelthatwaspressurizedbythelowpressurepumpflows;

ahighpressurepumpwhichiscapabletopressurizethefuelsuppliedviathebranchpassage,thehighpressurepumpbeingdrivenbytheinternalcombustionengine;

ahighpressurefuelsupplypassagethatiscapabletosupplyfuelthatwaspressurizedbythehighpressuretoahighpressurefuelinjectionmechanismwhichinjectsfuelintoacylinder;

andapulsationreducingmechanismprovidedonanintakesideofthehighpressurepump,wherein,whentheinternalcombustionengineisstartedbyonlyinjectingfuelfromthelowpressuresupplypassageintotheintakepassage,thepulsationreducingmechanismclosesoffcommunicationbetweenthelowpressurefuelsupplypassageandthehighpressurefuelsupplypassageuntilapressureoffuelinthelowpressurefuelsupplypassagereachesapredeterminedpressurevaluerequiredforstartingtheinternalcombustionengine.

Backgroundoftheinvention:

1.FieldoftheInvention

Theinventionrelatestoafuelsupplysystemforaninternalcombustionengineprovidedwithafuelinjectionmechanismthatinjectsfuelathighpressureintoacylinder（i.e.;

afuelinjectorforin-cylinderinjection,hereinafterreferredtoas“in-cylinderfuelinjector”）andafuelinjectionmechanismthatinjectsfuelintoanintakepassageoranintakeport（i.e.,afuelinjectorforintakepassageinjection,hereinafterreferredtoas“intakepassagefuelinjector”）.Moreparticularly,theinventionrelatestoafuelsupplysystemthatcanimprovestartabilityofaninternalcombustionengine.

2.DescriptionoftheRelatedArt

Agasolineengineisknownwhichisprovidedwithafastfuelinjectionvalveforinjectingfuelintoacombustionchamberoftheengine（i.e.,anin-cylinderfuelinjector）andasecondfuelinjectionvalveforinjectingfuelintoanintakepassage（i.e.,anintakepassagefuelinjector）,anddividestheinjectedfuelbetweenthein-cylinderfuelinjectorandtheintakepassagefuelinjectoraccordingtotheenginespeedandengineload.Also,adirectinjectiongasolineengineisalsoknownwhichisprovidedwithonlyafuelinjectionvalveforinjectingfuelintothecombustionchamberoftheengine（i.e.,anin-cylinderfuelinjector）.Inahighpressurefuelsystemthatincludesanin-cylinderfuelinjector,fuelofwhichthepressurehasbeenincreasedbyahighpressurefuelpumpissuppliedtothein-cylinderfuelinjectorviaadeliverypipe.Thein-cylinderfuelinjectortheninjectsthehighpressurefuelintothecombustionchamberofeachcylinderoftheinternalcombustionengine.

Inaddition,adieselengineisalsoknownwhichhasacommonrailtypefuelinjectionsystem.Inthiscommonrailtypefuelinjectionsystem,fuelwhichhasbeenincreasedinpressurebyahighpressurefuelpumpisstoredinacommonrail.Thehighpressurefuelistheninjectedintothecombustionchamberofeachcylinderofthedieselenginefromthecommonrailbyopeningandclosinganelectromagneticvalve.

Inordertoincreasethepressureof（i.e.,pressurize）thefuelinthiskindofinternalcombustionengine,ahighpressurefuelpumpisprovidedwhichisdrivenbyacamprovidedonadriveshaftthatisconnectedtoacrankshaftoftheinternalcombustionengine.

JapanesePatentApplicationPublicationNo.JP-A-2005-139923describesahighpressurefuelsupplysystemforaninternalcombustionenginethatcanreducevibrationalnoisewhenonlyasmallamountoffuelisrequiredbytheinternalcombustionengine,suchasduringidling,whilebeingabletodeliverthenecessaryamountoffuelovertheentireoperatingrangeoftheinternalcombustionengine.Thishighpressurefuelsupplysystemforaninternalcombustionenginehasatwosingleplungertypehighpressurefuelpumpseachofwhichhaveaspillvalvethatspillsfueldrawnintoapressurizingchamberthatisdividedbyacylinderandaplungerthatmovesbackandforthinthecylinder,fromthatpressurizingchamber.Whenfuelispressurizedanddeliveredfromthepressurizingchambertothehighpressurefuelsystem,theamountoffueldeliveredisadjustedbycontrollingthespillvalveopenandclosed.Oneofthesehighpressurefuelpumpsisafirsthighpressurefuelpumpinwhichtheliftamountoftheplungerissmallandtheotherhighpressurefuelpumpisasecondhighpressurefuelpumpinwhichtheliftamountoftheplungerislarge.Inadditiontothesetwohighpressurefuelpumps,thehighpressurefuelsupplysystemforaninternalcombustionenginealsoincludescontrolmeans.Thecontrolmeanscontrolsthespillvalveofeachhighpressurefuelpumpaccordingtotheamountoffuelrequiredbytheinternalcombustionengine,suchthatfuelispressurizedanddeliveredusingonlythefirsthighpressurefuelpumpwhentheamountofrequiredfuelissmall,andfuelispressurizedanddeliveredusingatleastthesecondhighpressurefuelpumpwhentheamountofrequiredfuelislarge.

Accordingtothishighpressurefuelsupplysystemforaninternalcombustionengine,ofthetwohighpressurefuelpumps,thefirsthighpressurefuelpumphasaplungerwithasmallliftamountsotherateofpressureincreaseissmallandalargeamountofwaterhammerisalsoself-suppressed.Thatis,withthehighpressurefuelsupplysystem,thevibrationalnoiseproducedwhentherequiredfuelquantityissmallcanbepreferablyreducedbycontrollingthespillvalveofeachofthehighpressurefuelpumpssothatonlythefirsthighpressurefuelpumpisusedwhentheamountoffuelrequiredfortheinternalcombustionengineissmallsuchasduringidling.Ontheotherhand,thesecondhighpressurefuelpumphasaplungerwithalargeliftamountsopressurizinganddeliveringfuelusingatleastthissecondhighpressurefuelpumpalsomakesitpossibletodelivertherequiredfuelquantitywhentheamountoffuelrequiredbytheinternalcombustionengineincreasestothepointwhereitcannolongerbedeliveredbythefirsthighpressurefuelpumpalone.Thatis,providingtwohighpressurefuelpumpshavingplungerswithdifferentliftamountsinthiswayenablestherequiredamountoffueltobedeliveredthroughouttheentireoperatingrangeoftheinternalcombustionengine,whilereducingvibrationalnoisewhentheamountofrequiredfuelissmall.

InJapanesePatentApplicationPublicationNo.JP-A-2005-139923,thehighpressurefuelsupplysystemforaV-type8cylinderinternalcombustionenginehavinganin-cylinderfuelinjectorineachcylinderisprovidedwithahighpressurefuelpumpforeachbank.Tipendsthatbranchofffromalowpressurefuelpassagewhichisconnectedtothefueltankareconnectedtogalleriesofthesehighpressurefuelpumps.Foreachbank,apulsationdamperisprovidedmidwaybetweenthebranchportionofthelowpressurefuelpassageandtheportionthatconnectswiththegallery.Thispulsationdampersuppressesthepulsationinthefuelpressureinthelowpressurefuelpassagewhenthehighpressurefuelpumpisoperating.Atenginestartupinthiskindofadirectinjectionenginehavingonlyanin-cylinderfuelinjector,fuelisunabletobedeliveredbythehighpressurefuelpumpuntiltheengineturnsover.Therefore,lowpressurefuelisdeliveredbyafeedpumptothefuelinjectionforin-cylinderinjection.Therefore,thepulsationdamperisdesignedtoprovidecommunicationbetweenthehighpressurepipesystemandthelowpressurepipesystem.Forexample,FIG.6isasectionalviewofsuchapulsationdamper215,FIG.7isasectionalviewtakenalonglineVII-VIIofFIG.6,andFIG.8isasectionalviewtakenalonglineVIII-VIIIofFIG.7.AsshowninFIGS.6to8,grooves223A,223B,223C,and223Dareprovidedinanendface（i.e.,theuppersurfaceinFIG.8）thatabutsagainstacontactingmember226Aofthepulsationdamper215.Therefore,whenthefeedpressureislow,thespring226Dpressesthecontactingmember226Aagainsttheuppersurfaceofthememberthatformstheinlet222andtheoutlet224.Inthisway,thestructureissuchthatevenifpressureisappliedbythespring226D,thegrooves223A,223B,223C,and223Denablefueldeliveredfromtheinlet222（i.e.,thefeedpumpside）toflowintotheoutlet224（i.e.,thehighpressurefuelpumpside）asshownbythedottedlineinFIG.8.Ontheotherhand,asdescribedabove,anengineisknownwhichincludes,foreachcylinder,anin-cylinderfuelinjectorthatinjectsfuelintoacombustionchamberoftheengineandanintakepassagefuelinjectorthatinjectsfuelintoanintakepassage.Inthisengine,