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1TsinghuaUniversityThesisThesis:AutomotiveEngineCoolingSystemMaintenanceDepartment:AutomotiveandElectricalEngineeringProfession:VehicleInspectionandMaintenanceClasslevel:09motorseizure(1)Name:BruceLeeStudentID:090135Instructor:FengCompletion:October20102TableofContentsAbstract............................................................................................................3Keywords.........................................................................................................3Introduction......................................................................................................3Roleandcompositionofthefirstchapterofthecoolingsystem.......................3Thesecondchapterofthecoolingsystemconstructionandmaintenance.......4ChapterIIIofthecharacteristicsofthecoolingsystem.....................................6Thefourthchapterofthecoolingsystemmaintenance.....................................6ChaptercoolingsystemSmartControl.....................................................75.1systemcomponents...................................................................................75.2singlechipcontrolsystemworks...............................................................75.3oftheSCMsystemtocontroltheworkprocess..........................................7Conclusion.......................................................................................................8Xieci..................................................................................................................8References.......................................................................................................8..........3AbstractThispaperdescribestheroleofthecoolingsystem,composedofthemainstructure,works,routinemaintenance,faultdetectionstepsandeliminationmethods,discussesthecoolingsystemsystematic,modulardesign,andintelligentcontrolofthecoolingsystemandanexamplemakeabriefintroduction.Keywords:coolingsystem,coolingsystemtomaintainthetemperaturesetpointcoolingsystemintelligentcontrol4Introduction:Ifanenginecoolingsystemrepairratehasbeenhigh,oftencausedbyothercomponentsoftheenginedamage,especiallywiththeincreaseinvehiclemileage,theworkefficiencyofthecoolingsystemofgradualdeclineintheoverallabilityoftheenginegreaterimpact,theimportanceofthecoolingsystemismaintenanceworkintheengineroomtemperature,justliketheskinandsweatglandsofthebody,ifoneday,thebody'ssweatglandsarenotworkingproperly,thebody'sheatwillnotbeabletodisperse,rangingfromproduceheatstroke,re-thentheshock.TheroleandcompositionofthefirstchapterofthecoolingsystemThefunctionofthecoolingsystemistakenawaybytheengineduetocombustionheatgeneratedbytheenginetoremainwithinthenormaloperatingtemperaturerange.Engineinaccordancewiththemannerofcoolingcanbedividedintoair-cooledenginesandwater-cooledengines,air-cooledenginesrelyonengine-drivenfansandairflowtocooltheenginewhenthevehicle;water-cooledengineiscooledbycoolingwatercirculatingintheenginetoengine.Regardlessofminingthewayinwhichcooling,thenormalcoolingsystemmustensurethattheengineinallsortsofdrivingenvironmentsarenotcausedbyoverheating.Thewatercoolingsystemisgenerallycomposedbytheradiator,thermostat,waterpump,waterway,fan.Theradiatorisresponsibleforcirculatingwatercooling,waterpipesandheatsinksuseofaluminum,aluminumpipesmadeofflatshape,theheatsinkwithacorrugated,focusingonthethermalperformance,installationdirectionperpendiculartothedirectionofairflow,asfaraspossibledodragissmall,highercoolingefficiency.Theradiatorisdividedintohorizontalflowandverticalflowoftwotypesofairconditioningcondenserisusuallyitsfittogether.WaterpumpandthermostatEnginebythecoolantloop,thecomponentsofforcedcoolantcirculationpump,drivenbythecrankshaftbelt,promotethecoolantcirculatingthroughoutthesystem.ThemostadvancedwaterpumpiselectricwaterpumponanewgenerationofBMWstraightsixengine,thatispreciselycontrolthepumpspeed,andeffectivelyreducethelossofoutputpower.Thesecoolantcoolingtheengine,accordingtotheworkoftheengineatanytimeadjust.Whentheenginetemperatureislow,thecoolantwithintheengineitself,smallcycles,whentheenginetemperatureishigh,thecoolantintheengine-betweenradiatorbigger5cycle.Partsofthecoolanttododifferentcyclecontrolisthethermostat.Thermostatcanbeseenasavalve,theprincipleistousewiththetemperatureexpansionofthematerial(paraffinoretheroftheclassmaterials)andaswitchvalve,expansionvalvetoopenthetop,whenthehighwatertemperaturematerialsandcoolantforlargecycle,whenthewatertemperatureislowshrinkageclosethevalve,coolantsmallcycles.TheflowofairInordertoimprovethecoolingcapacityoftheradiator,fanforcedventilationisinstalledbehindtheradiator.Carradiatorfanisdirectlydrivenbythecrankshaftbelt,enginetostartitisnecessarytotransfer,cannot,astheenginetemperaturechanges,inordertoadjustthecoolingpoweroftheradiatorintheradiatorinstalledontheactivitiesofonehundredwindowstocontrolwindtoenter.Thenowwidespreaduseoffanelectromagneticclutchorelectronicfanclutchandshaftseparation,whenthewatertemperatureisrelativelylow,thefandoesnotmovepowerfromthetemperat