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外文翻译--发动机冷却系统.doc

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外文翻译--发动机冷却系统.doc

外文翻译11SUMMARIZEOUTLINEUSESAMORECOMPACTDESIGNALONGWITHTHEENGINEANDHASINABIGWAY,THEENGINEPRODUCESTHEWASTEHEATDENSITYALSOOBVIOUSLYINCREASESALONGWITHITSOMEESSENTIALREGIONS,IFAROUNDAROWOFTYREVALVERADIATESTHEQUESTIONTOHAVEFIRSTTOCONSIDER,THECOOLINGSYSTEMEVENIFAPPEARSTHESMALLBREAKDOWNALSOPOSSIBLYTOCREATETHEDISASTERINSUCHREGIONCONSEQUENCETHEENGINECOOLINGSYSTEMRADIATIONABILITYGENERALLYSHOULDSATISFYWHENTHEENGINEFULLLOADRADIATIONDEMAND,BECAUSETHISTIMEENGINEPRODUCESTHEQUANTITYOFHEATISBIGGESTHOWEVER,WHENPARTIALLOADS,THECURRENTCAPACITYWHICHTHECOOLINGSYSTEMCANHAVETHEPOWERLOSS,WHICHTHEWATERPUMPINGSTATIONPROVIDESTHEREFRIGERANTCURRENTCAPACITYSURPASSESNEEDSWEHOPEDSTARTSTHESTARTINGTIMETOBEASFARASPOSSIBLESHORTBECAUSEENGINETIMEDISCHARGESPOLLUTANTMORE,THEOILCONSUMPTIONISALSOBIGTHECOOLINGSYSTEMSTRUCTUREHASAMORETREMENDOUSINFLUENCETOTHEENGINECOLDSTARTINGTIME2CHARACTERISTICSOFMODERNENGINECOOLINGSYSTEMMODERNENGINESSERIESCHARACTERISTICTRADITIONCOOLINGSYSTEMFUNCTIONRELIABLYPROTECTSTHEENGINE,BUTALSOSHOULDHAVETHEFUNCTIONWHICHTHEIMPROVEMENTFUELECONOMYANDREDUCESDISCHARGESTHEREFORE,THEMODERNCOOLINGSYSTEMMUSTSYNTHESIZEUNDERTHECONSIDERATIONTHEFACTORENGINEINTERIORFRICTIONLOSS;COOLINGSYSTEMWATERPUMPPOWER;BURNINGBOUNDARYCONDITION,LIKECOMBUSTIONCHAMBERTEMPERATURE,COMPLETEDENSITY,COMPLETETEMPERATURETHEADVANCEDCOOLINGSYSTEMUSESSYSTEMATIZED,THEMODULARDESIGNMETHOD,THEOVERALLPLANCONSIDEREDEACHINFLUENCEFACTOR,CAUSESTHECOOLINGSYSTEMBOTHTOGUARANTEETHEENGINENORMALWORK,ANDENHANCESTHEENGINEEFFICIENCYANDTHEREDUCTIONDISCHARGES21THETEMPERATURESSETPOINTTEMPERATURESHYPOTHESESFIRINGINBURSTSMOTIVEOPERATINGTEMPERATURELIMITVALUEAREDECIDEDBYAROWOFTIREVALVETHEPERIPHERALREGIONMAXIMUMTEMPERATURETHEMOSTIDEALSITUATIONISACCORDINGTOTHEMETALTEMPERATUREBUTISNOTTHEREFRIGERANTTEMPERATURECONTROLCOOLINGSYSTEM,LIKETHISCANPROTECTTHEENGINEWELLBECAUSETHECOOLINGSYSTEMHYPOTHESISCOOLINGTEMPERATUREISBYTHEFULLLOADTIMEMOSTISBIGISTHEFOUNDATION,THEREFORE,ENGINEANDCOOLINGSYSTEMINPARTIALLOADSTIMEISATNOTTOOTHEPERFECTCONDITION,WHENURBANDISTRICTTRAVELANDLOWSPEEDTRAVEL,CANHAVETHEHIGHOILCONSUMPTIONANDDISCHARGESUPPOSESTHEFIXEDPOINTTHROUGHTHECHANGEREFRIGERANTTEMPERATURETOBEPOSSIBLETOIMPROVETHEENGINEANDTHECOOLINGSYSTEMINPARTIALLOADSTIMEPERFORMANCEACCORDINGTOAROWOFTYREVALVETHEPERIPHERALREGIONTEMPERATURELIMITVALUE,MAYELEVATEEITHERREDUCETHEREFRIGERANTORTHEMETALTEMPERATURESUPPOSESTHEFIXEDPOINTELEVATESORREDUCEDTEMPERATUREALLRESPECTIVELYHASTHECHARACTERISTIC,THISISDECIDEDTHEGOALWHICHACHIEVEDTOTHEHOPE22ENHANCESTHETEMPERATUREENHANCESTHETEMPERATURETOSUPPOSETHEFIXEDPOINTENHANCEMENTOPERATINGTEMPERATURETOSUPPOSETHEFIXEDPOINTISONEKINDOFCOMPARISONTHEMETHODWHICHWELCOMEENHANCESTHETEMPERATURETOHAVEMANYMERITS,ITDIRECTLYAFFECTSTHEENGINELOSSANDTHECOOLINGSYSTEMEFFECTASWELLASTHEENGINEDISCHARGINGFORMATIONWILLENHANCETHEOPERATINGTEMPERATURETOENHANCETHEENGINEMACREDUCETHEENGINETORUBWEARS,REDUCESTHEENGINEFUELOILCONSUMPTIONTHERESEARCHINDICATEDTHAT,THEENGINEOPERATINGTEMPERATURETORUBSTHELOSSTOHAVETHEVERYTREMENDOUSINFLUENCEDISCHARGESTHETEMPERATURETHEREFRIGERANTTOENHANCETO150℃,CAUSESTHECYLINDERTEMPERATURETOELEVATETO195℃,THEOILCONSUMPTIONDROPS46MAINTAINSTHEREFRIGERANTTEMPERATUREIN90115℃SCOPE,CAUSESTHEENGINEMACHINEOILTHEMAXIMUMTEMPERATUREIS140℃,THENOILCONSUMPTIONINPARTIALLOADSTIMEDROPS10ENHANCESTHEOPERATINGTEMPERATUREALSOOBVIOUSINFLUENCECOOLINGSYSTEMTHEPOTENCYENHANCESTHEREFRIGERANTORTHEMETALTEMPERATURECANIMPROVETHEENGINEANDDISPERSETHESTEAMHEATTRANSFERTRANSMISSIONTHEEFFECT,REDUCESTHEREFRIGERANTTHESPEEDOFFLOW,REDUCESTHEWATERPUMPTHERATEDPOWER,THUSREDUCESTHEENGINETHEPOWERDISSIPATIONINADDITION,MAYSELECTTHEDIFFERENTMETHOD,FURTHERREDUCESTHEREFRIGERANTTHESPEEDOFFLOW23REDUCETHETEMPERATURESSETPOINTREDUCEDTEMPERATURESSUPPOSETHEFIXEDPOINTTOREDUCETHECOOLINGSYSTEMTHEOPERATINGTEMPERATURETOBEPOSSIBLETOENHANCETHEENGINECHARGEEFFICIENCY,REDUCESTHEINLETTEMPERATURETHISTOTHECOMBUSTIONPROCESS,THEFUELOILEFFICIENCYANDDISCHARGESADVANTAGEOUSLYTHEREDUCEDTEMPERATURESUPPOSESTHEFIXEDPOINTTOBE外文翻译2ALLOWEDTOSAVETHEENGINEMOVEMENTCOST,ENHANCESTHEPARTSERVICELIFETHERESEARCHINDICATED,IFTHECYLINDERHEADTEMPERATUREREDUCESTO50℃,THEIGNITIONANGLEOFADVANCEMAY3℃ABUTNOTHAVETHEENGINEKNOCKAHEADOFTIME,THECHARGEEFFICIENCYENHANCES2,THEENGINEOPERATIONALFACTORIMPROVEMENT,ISHELPFULTOTHEOPTIMIZEDCOMPRESSIONRATIOANDTHEPARAMETERCHOICE,OBTAINSTHEBETTERFUELOILEFFICIENCYANDDISCHARGESTHEPERFORMANCE24PRECISECOOLINGSYSTEMPRECISECOOLINGSYSTEMSPRECISECOOLINGSYSTEMMAINLYMANIFESTSINTHECOOLINGJACKETSTRUCTURALDESIGNANDINTHEREFRIGERANTSPEEDOFFLOWDESIGNINPRECISECOOLINGSYSTEM,HOTESSENTIALAREA,IFAROUNDAROWOFTYREVALVE,THEREFRIGERANTHASANGREATERSPEEDOFFLOW,THEHEATTRANSFEREFFICIENCYISHIGH,THEREFRIGERANTGRADIENTOFTEMPERATURECHANGESSLIGHTLYSUCHEFFECTCOMESFROMTOREDUCETHESEPLACEREFRIGERANTCHANNELSTHELATERALSECTION,ENHANCESTHESPEEDOFFLOW,REDUCESTHECURRENTCAPACITYTHEPRECISECOOLINGSYSTEMDESIGNKEYLIESINTHEDETERMINATIONCOOLINGJACKETTHESIZE,THECHOICEMATCHCOOLINGWATERPUMP,GUARANTEEDTHESYSTEMTHERADIATIONABILITYCANSATISFYWHENTHELOWSPEEDBIGLOADESSENTIALREGIONOPERATINGTEMPERATUREDEMANDTHEENGINEREFRIGERANTSPEEDOFFLOWRANGEOFVARIATIONISQUITEBIG,FROMTIME1M/STOMAXIMUMWORKRATETIME5M/STHEREFORESHOULDCONSIDEREDTHECOOLINGJACKETANDTHECOOLINGSYSTEMWHOLETHAT,MUTUALLYSUPPLEMENTED,DISPLAYBIGGESTPOTENTIALTHERESEARCHINDICATEDTHAT,USESTHEPRECISECOOLINGSYSTEM,INTHEENGINEENTIREWORKROTATIONALSPEEDSCOPE,THEREFRIGERANTCURRENTCAPACITYMAYDROP40COVERSTHECOOLINGJACKETTOTHEAIRCYLINDERTHEPRECISEDESIGN,MAYMAKETHEORDINARYSPEEDOFFLOWTOENHANCEFROM14M/STO4M/S,GREATLYENHANCESTHECYLINDERCOVERORCAPTHERMALCONDUCTIVITY,CYLINDERCOVERORCAPMETALTEMPERATUREDROPTO60℃25DIVERGENCESTYPESCOOLINGSYSTEMDIVERGENCESTYPESCOOLINGSYSTEMDIVERGENCETYPECOOLINGSYSTEMFOROTHERONEKINDOFCOOLINGSYSTEMINTHISKINDOFCOOLINGSYSTEM,THEHINEOILTEMPERATURE,WILLCYLINDERCOVERORCAPFRIENDLYCYLINDERBODYCOOLSBYRESPECTIVERETURNROUTE,THECYLINDERCOVERORCAPFRIENDLYCYLINDERBODYHASTHEDIFFERENTTEMPERATURETHEDIVERGENCELIKECOOLINGSYSTEMHASTHEUNIQUESUPERIORITY,MAYCAUSEENGINEEACHPARTTOSUPPOSETHEFIXEDPOINTWORKATTHEMOSTSUPERIORTEMPERATURETHECOOLINGSYSTEMOVERALLEFFICIENCYACHIEVESINABIGWAYEACHCOOLINGRETURNROUTEWILLSUPPOSEUNDERTHEFIXEDPOINTORTHESPEEDOFFLOWINTHEDIFFERENTCOOLINGTEMPERATUREWORKS,WILLCREATETHEIDEALENGINETEMPERATUREDISTRIBUTIONTHEIDEALENGINEHOTACTIVESTATUSISTHECYLINDERHEADTEMPERATURELOWERBUTTHEAIRCYLINDERBODYTEMPERATURERELATIVEISHIGHERTHECYLINDERHEADTEMPERATUREISLOWERMAYENHANCETHECHARGEEFFICIENCY,INCREASESTHETEMPERATUREISLOWALSOGREATLYMAYPROMOTECOMPLETELYTOBURN,REDUCESCO,HCANDTHENOXFORMATION,ALSOENHANCESTHEOUTPUTTHEHIGHERAIRCYLINDERBODYTEMPERATURECANREDUCETHEFRICTIONTOLOSE,DIRECTLYIMPROVESTHEFUELOILEFFICIENCY,INDIRECTLYREDUCESINTHECYLINDERTHEPEAKVALUEPRESSUREANDTHETEMPERATURETHEDIVERGENCETYPECOOLINGSYSTEMMAYCAUSETHECYLINDERCOVERANDTHECYLINDERBODYTEMPERATUREDIFFERS100℃THECYLINDERTEMPERATUREMAYREACHASHIGHAS150℃,BUTTHECYLINDERCOVERTEMPERATUREMAYREDUCE50℃,REDUCESTHECYLINDERBODYTORUBLOSES,REDUCESTHEOILCONSUMPTIONTHEHIGHERCYLINDERBODYTEMPERATURECAUSESTHEOILCONSUMPTIONTOREDUCE46,WHENPARTIALLOADSHCREDUCES2035WHENTHEDAMPERALLOPENS,THECYLINDERCOVERANDTHECYLINDERBODYTEMPERATURESUPPOSESTHEDEFINITEVALUETOBEPOSSIBLETOMOVETO50℃AND90℃,IMPROVESTHEFUELOILCONSUMPTION,THEPOWEROUTPUTFROMTHEWHOLEANDDISCHARGES26CONTROLLABLECOOLINGSYSTEMCONTROLLABLEENGINECOOLINGSYSTEMTRADITIONENGINECOOLINGSYSTEMBELONGSTOTHEPASSIVEFORM,THESTRUCTURESIMPLEORTHECOSTISLOWTHECONTROLLABLECOOLINGSYSTEMMAYMAKEUPATPRESENTCOOLINGSYSTEMTHEINSUFFICIENCYNOWTHECOOLINGSYSTEMDESIGNSTANDARDSOLVESTIMETHEFULLLOADRADIATIONPROBLEM,THUSPARTIALLYSHOULDERSTIMETHEOVERSIZEDRADIATIONABILITYWILLCAUSETHEENGINEPOWERWASTETHISTOTHELIGHTVEHICLESAIDESPECIALLYOBVIOUS,THESEVEHICLESMAJORITYTIMEALLUNDERTHEPARTIALLOADSGOINTHEURBANDISTRICT,ONLYUSESTHEPARTIALENGINEPOWER,CAUSESACOOLINGSYSTEMHIGHERLOSSINORDERTOSOLVETHEENGINETOGETDOWNTHEHOTQUESTIONINTHEPECULIARCIRCUMSTANCE,THEPRESENTCOOLINGSYSTEMVOLUMEWASBIGGER,CAUSESTHEEVAPORATIONEFFICIENCYTOREDUCE,HASINCREASEDTHECOOLINGSYSTEMPOWERDEMAND,LENGTHENEDTHEENGINE外文翻译3DURINGWARMMACHINEHOURTHECONTROLLABLEENGINECOOLINGSYSTEMGENERALLYINCLUDESTHESENSOR,THEEXECUTIONANDTHEELECTRICALLYCONTROLLEDMODULETHECONTROLLABLECOOLINGSYSTEMCANACTACCORDINGTOTHEENGINEWORKINGCONDITIONADJUSTMENTCOOLINGQUANTITY,REDUCESTHEENGINEPOWERLOSSINTHECONTROLLABLECOOLINGSYSTEM,THEEXECUTIONFORTHECOOLINGWATERPUMPANDTHETHERMOSTAT,GENERALLYANDTHECONTROLVALVEISCOMPOSEDBYTHEELECTRICALLYOPERATEDWATERPUMP,MAYACTACCORDINGTOREQUESTSTOADJUSTTHECOOLINGQUANTITYTEMPERATURESENSORFORASYSTEMPART,BUTRAPIDLYBEQUEATHSTHEENGINEHOTCONDITIONTHECONTROLLERCONTROLLABLEINSTALLMENT,IFTHEELECTRICALLYOPERATEDWATERPUMP,MAYSUPPOSETHETEMPERATURETHEFIXEDPOINTFROM90℃TOENHANCETO110℃,SAVES25FUELOIL,COREDUCES20,HCREDUCES10WHENSTEADYSTATE,THEMETALTEMPERATURERATIOTRADITIONCOOLINGSYSTEMISHIGH10℃,THECONTROLLABLECOOLINGSYSTEMHASTHEQUICKERRESPONSEABILITY,MAYCOOLTHETEMPERATURETOMAINTAINISSUPPOSINGTHEFIXEDPOINT2℃THESCOPEFROM110℃DROPSTO100℃ONLYNEEDS2STHEENGINEDURINGWARMMACHINEHOURREDUCES200S,THECOOLINGSYSTEMOPERATINGREGIONDRAWSCLOSETOTHEWORKLIMITREGION,CANREDUCETHEENGINECOOLINGTEMPERATUREANDTHEMETALTEMPERATUREUNDULATIONSCOPE,REDUCESCIRCULATESTHEFATIGUEOFMETALWHICHTHEHOTLOADCREATES,LENGTHENSTHECOMPONENTLIFE3CONCLUSIONINFRONTOF3CONCLUSIONSINTRODUCEDSEVERALKINDOFADVANCEDCOOLINGSYSTEMSHAVETHEIMPROVEMENTCOOLINGSYSTEMPERFORMANCETHEPOTENTIAL,CANENHANCETHEFUELOILEFFICIENCYANDDISCHARGETHEPERFORMANCETHECOOLINGSYSTEMCANCONTROLTHENATUREISIMPROVESTHECOOLINGSYSTEMTHEKEY,CANTHECONTROLLINGEXPRESSIONTOTHEENGINESTRUCTUREPROTECTIONESSENTIALPARAMETER,LIKETHEMETALTEMPERATURE,THEREFRIGERANTTEMPERATUREANDTHEMACHINEOILTEMPERATUREANDSOONCANCONTROL,GUARANTEESTHEENGINETOWORKINTHESAFETYMARGINSCOPETHECOOLINGSYSTEMCANMAKETHERAPIDREACTIONTOTHEDIFFERENTOPERATINGMODE,THEMOSTEARTHSAVESTHEFUEL,REDUCESDISCHARGES,BUTDOESNOTAFFECTTHEENGINEOVERALLPERFORMANCELOOKEDFROMTHEDESIGNANDTHEOPERATIONALPERFORMANCEANGLETHAT,DIVERGENCETYPECOOLINGANDPRECISECOOLINGUNIFIESHASTHEVERYGOODPROSPECTSFORDEVELOPMENT,BOTHCANPROVIDETHEIDEALENGINEPROTECTION,ANDCANENHANCETHEFUELOILEFFICIENCYANDDISCHARGETHENATURETHISKINDOFSTRUCTUREISADVANTAGEOUSTOFORMINGTHEENGINEIDEALTEMPERATUREDISTRIBUTIONDIREC

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