【英文标准名称】:StandardTestMethodforEvaluationofAerationResistanceofEngineOilsinDirect-InjectedTurbochargedAutomotiveDieselEngine
【原文标准名称】:直接喷射式涡轮增压汽车柴油发动机用机油的抗混气性能评价的标准试验方法
【标准号】:ASTMD6894-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D02.B0.02
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:aeration;automotive;dieselengine;EOAT;foaming;heavy-duty;HEUI;medium-duty;Aerationresistance;ASTMTestMonitoringCenter(TMC2);Automotiveenginefuels/oils;Dieselenginefueloils;EOAT(engineoilaerationtest);Foaming
【摘要】:Background8212;IntheHEUIfuelsystem,theengineoilfromtheoilsumpnotonlylubricatestheengine,italsosuppliesahigh-pressureoilsystemthattakesoilfromthemaingalleryandpressurizesitupto20.7MPainaplungerpump(seeFig.A1.1).Thisoilisusedtooperateunitinjectorsthat,whenusedincombinationwithintensifiers,increasethefuelinjectionpressureupto145MPa,independentofenginespeed.Theelectroniccontrolspermitvariedinjectiontiminganddurationtoprovideoptimumfueleconomyandemissions.Thissystemmay,however,circulatealltheoilinthesumpinapproximately8s;asaconsequence,aerationoftheoilcanoccurwithsomeengineoils.Internationaldeterminedthat8%oilaerationwasthelimitbeyondwhichengineoperationandperformancewouldbeimpairedinactualservice.Priorto1994,theabilityofanenginelubricanttoresistaerationwasmeasuredbyTestMethodD892.DuringthedevelopmentoftheAPICG-4categoryin1994,however,itwasfoundthatthisbenchtestdidnotcorrelatewithaerationintheInternationalT444Eengine.TheEOATwasdeveloped,therefore,toprovideabettermeasurementoftheabilityofalubricanttoresistaerationduringengineoperation.ThistesthasbeenincludedinAPICG-4,CH-4,andCI-4categoriesforheavy-dutydieselengineoils.Method8212;Thedataobtainedfromtheuseofthistestmethodprovideacomparativeindexoftheaerationresistanceofengineoilsusedinmedium-andheavy-dutytruckdieselengines.Use8212;Thetendencyofengineoilstoaerateindirect-injection,turbochargeddieselenginesisinfluencedbyavarietyoffactors,includingengineoilformulationvariables,oiltemperature,sumpdesignandcapacity,residencetimeoftheoilinthesump,andthedesignofthepressurizedoilsystems.Insomeengine-oil-activatedinjectionsystems,theresidencetimeoftheoilinthesumpisinsufficienttoallowdissipationofaerationfromtheoil.Asaconsequence,aeratedoilcanbecirculatedtotheinjectorintensifiers,adverselyaffectingtheinjectiontimingcharacteristicsandengineoperation.1.1Thistestmethodwasdesignedtoevaluateanengineoil''sresistancetoaerationinautomotivedieselengineservice.ItiscommonlyreferredtoastheEngineOilAerationTest(EOAT).Thetestisconductedusingaspecified7.3L,direct-injection,turbochargeddieselengineonadynamometerteststand.ThistestmethodwasdevelopedasareplacementforTestMethodD892afteritwasdeterminedthatthisbenchtestdidnotcorrelatewithoilaerationinactualservice.TheEOATwasfirstincludedinAPIServiceCategoryCG-4in1995.Note18212;CompaniontestmethodsusedtoevaluateengineoilperformanceforspecificationrequirementsarediscussedinthelatestrevisionofSpecificationD4485.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.2.1Exception8212;WherethereisnodirectSIequivalent,forexample,screwthreads,nationalpipethreads/diameters,andtubingsize.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafety......
【中国标准分类号】:E34
【国际标准分类号】:75_100
【页数】:12P.;A4
【正文语种】:英语