技术---C18发动机

ACERTTMTechnologyfor0ff-HighwayC18EnginesACERTTM技术---C18发动机WhatdoesACERTstandfor?ACERT代表什么?Advanced高级Combustion燃烧Emission排放Reduction减少Technology技术WhatisACERTTechnology?ACERT技术是什么?Multipletechnologies多重技术Variesbyenginefamily随发动机系列而变化Variesbyengineapplication随发动机应用而变化-Mediumduty–specs,change,newdesign中速-Heavyduty-specs,change,newdesign重型Whatenginesareaffected?发动机受什么影响?C-18isbasedofftheC15plateformC18是脱离于C15平台的Displacementchangesfrom15.2to18.1ltr排量从15.2变化至18.1升Boreincreasefrom137mmto145mmStrokeincreasesfrom171mmto183mmHowisACERTTechnologyDifferent?ACERT技术有什么区别?WhatdoesACERTTechnologylooklike?ACERT技术看起来像什么?HowdoesACERTTechnologywork?ACERT技术是如何工作的?WhataretheadvantagesofACERTTechnology?ACERT技术的优点是什么?Isextramaintenancerequired?需要哪些额外的维修?C18Enginepowerbandperformance2100rpmprovidewidestoperatingrangeeasiestmatchinchangover2100rpm提供了最广泛的运行范围,在转化上更佳匹配1800rpmprovidebestfueleconomy,bestheatrejection,lessnoise1800rpm提供了最佳的燃油经济性,最佳的热量散发,低躁音Designstrategy设计策略ThecorestrategyfortheC18machineACERTenginewastobuildoffofthealreadysuccessfulC15.Inappearance,theC18machineACERTengineisvisuallysimilartotheC15andconsumesthesamefootprint.Adisplacementincreasewasachievedwithaboreandstrokechange.Thecompressionratiohaschangedandcanbeeither16.3:1or18:1basedontherating.Generally,thehighHPengineshavethelowercompressionratiowithhigherboostthanthe13001500170019002100RPMPOWERABCDEstandardHPratings.StandardHPratingsusuallyemployhighercompressionrationwithlowerboostsettings.Theincreaseincompressionratiohasbeneficialeffectsoncoldstartandwhitesmoke.C18机具ACERT发动机核心的设计是脱离于成熟的C15发动机的.在外观上,C18ACERT发动机看起来与C15非常相似.排量的增加是通过缸径和冲程变化来取得的.压缩比变化到16.3:1或18:1.通常,大功率发动机具有低压缩比,高增压.然而标准马力设定用高压缩比和低增压.增加的压缩比对冷起动和冒白烟效果更好.ACERTMultipleinjection-多重喷射OneofthekeyfeaturesofACERTtechnologyisincreasedsophisticationinthefuelinjectionsystem.AmorepowerfulECMisabletomorepreciselycontrolthefuelinjectionevent.CamshaftChanges----凸轮轴变化ThecamshafthaschangedslightlyintheC18machineACERTengine.TheinjectorlobeprofilehasbeengroundtoincludeanadditionalrampthatisusedwhentheECMdeterminestheneedforapilotinjection.Thisisaverysubtlechangetothelobeprofileandismoreeasilyfeltthanseen.ThelobeprofilemayvaryaswellfordifferentHPratings,makingthecamsnon-interchangeable.C18机具ACERT发动机的凸轮轴有轻微变化.喷油器凸缘轮廓被磨过还包括另外的坡道,这被ECM用来决定何时予喷射.这是个微妙的变化,很难看到,可是容易感觉.凸缘轮廓还会随不同马力级别而变化,使得凸轮轴不可互换.AreasofHigherRollerContactThetechnicianswillseetwoareaofhighercontactintherollertrackontheinjectorlobe.Themoreobviousheavycontactpatternwouldbenearlyatthenosefromthemaininjectionevent(similartoTierII)Thesecondarylocationwillbe15to20mmbeforetheprimarycontactareathatisgeneratedfromthemaininjection.Thetechniciansshouldnotmistakethisnormal2patchcontactpatternasabadcam.Thissecondcontactpatchwillvaryinsizeand“severity”witheachmachineengineapplicationsincethemainandpilotinjectedquantitywillbedifferentdependingonthemachine.Thisfeaturecambefeltasadiscontinuityifthetechnicianrunsafingeroverthecamlobeupfromthebasecircle.技师会发现在喷油器凸缘滚轮轨迹上有两块主要接触面积.最显然的一块是在鼻子上,另一块是第一块之前15~20mm.技师不能误会有两块补钉接触的模式作为作为坏凸轮.第二块接触补钉会严格随发动机应用而不同,因燃油主和予喷射数量会有所区别.如果用手指从基圆摸到凸缘,你就可以感觉到不连续性的特征.FuelSystem燃油系统Themechanicalactuated,electronicallycontrolled(MEUI)injectionsystemissimilartocurrentC15buthasmanyinternalchangestogiveitgreaterflexibility.Mechanicalandelectronicchangesallowthesystemtoinjectmultipletimesduringthecombustionevent.Notonlycanthenumberofinjectionsbevaried,buttheRATEatwhichthefuelisinjectedmaybevariedaswell.机械执行,电子控制的喷油系统与流行的C15相似,是具有很多内部的变化,给它更大的灵活性.机械和电子的变化允许系统在燃烧时喷射多次.不只数量上有变化,而在速率上有也变了.ADEM4ElectronicEngineControlGenerationsofExperience更新换代的历程Duringthepastdecade,advanceddesignshaveplayedamajorroleinimprovingtheoperationofdieselengines.Customerneedsforbetterperformancealongwithnewstandardsforloweremissionshaverequiredmoresophisticatedenginecontrols.Caterpillarhastakenthechallengeandhasmetandexceededthesedemandswiththedevelopmentofelectronicengines.Since1986,morethan500,000advancedCaterpillarelectronicengineshavebeenputinserviceintruck,marine,petroleum,industrial,andlocomotiveapplications.TheabovecontrolsshowtheadvancementofCaterpillarelectroniccontrolsbeginningwithPEECthatwasintroducedintheon-highwaytruckmarketin1987.ADEMIIIwasintroducedintrucksin1998andwillbeavailableforindustrialin2001.在以往的十年中,先进的设计在改进发动机的运行中扮演了一个重要的角色.客户对更好的性能即低排放的新标准需要更复杂的发动机的控制.卡特皮勒接受了挑战,符合并超过了电喷发动机发展的这些要求.从1986年以来,超过500,000先进的电喷发动机服务在卡车,船舶,石油平台,工业和火车头.以上的图展示了卡特皮勒电控发动机的发展始于1987年投放到市场的高速公路卡车上.Extremetemperaturetest极限温度的测试Extremetemperaturetestvibrationtestsaltspraytestelectrostaticstest温度测试震动测试盐分雾化测试静电测试Justlikeahomecomputer,theprocessingpoweroftheADEM4hasincreasedsignificantlyovertheADEM3.Thisallowsthegreatersophisticationneededtocontroltheincreasinglycomplexinjectionevent.TheeasiestwaytorecognizeanADEM4controlunitisthe120pinenginesideconnector.(Previouslywasa70pinconnector).TheECMalsohasalittlelargercrosssectionalongthebottom(thicker)althoughthecontrolunititselfcoversthesamefootprintastheADEM3.ADEM4具有与发动机相连的120插针的接口(保留以往70插针),可比ADEM3控制更复杂的喷射事件.19878-bitPEECII1991A