汽车检测站设计外文翻译

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1、原文一2.1CommonSystemConfigurationsAllchassisdynamometershaveseveralkeyfeaturesincommon.Mostimportantly,ameansofabsorbingthepoweroutputfromthetestvehicle’sengineisneededtoallowdifferentloadstobeappliedforavarietyoftestingprocedures.Energyistransmittedtothispowerabsorberviaad

2、irectconnectiontothevehicle’swheelhubs,orthroughasetofrollers,whicharerotatedbythewheelsofthetestvehicle.Flywheelsand/oramotoringcapabilitymayalsobeincludedifvehicleinertiaistobesimulated.DescriptionsofinertiasimulationandthemodellingofvariousvehicleforcesareincludedinCha

3、pter3.Systemsthatincorporateasetoflargerollers(onerollerforeachdrivenwheel)aremorecommoninapplicationsrequiringlongtermrunningofthevehicle,inwhichtyreoverheatingcanoccur.Hubdynamometersarebestsuitedtoenginetuningapplicationswhichdemandrapidresponseandminimalset-uptimebetw

4、eentests.AcommonandversatiledynamometerlayoutconsistsofasingleDCorACmachinemountedoutsidetherollersandonthesameaxis,asshowninFigure2.1..Outputpowerismostcommonlyabsorbedbyhydraulicorelectricmachines—alsoknownasdynamometers—whichdissipatepowereitherasheatorelectricalenergy

5、.Asingleunitthatcanperformbothmotoring(poweroutput)andgenerating(powerabsorption)functionsisacommonfeatureincommerciallyavailablechassisdynamometers.Allbutthesimplestofgaragetuningdynamometersincludethecapacitytomeasuretheequivalentroadspeedandtractiveforceappliedattheveh

6、icle’swheels.Chassisdynamometersforin-depthdrivingcycleandvehiclemappingtestscustomarilyincorporatemanydifferentmeasuringdevices,whicharesampledandrecordedbyacomputer-controlleddataacquisitionsystem.Commonfeaturesofinterestduringadynamometertestincludetheexhaustemissions(

7、suchasCO,CO2,NOXandunburnthydrocarbons),vehiclecoolingwaterandoiltemperatures,andofcoursetractiveforceandpoweroutput.Fuelconsumptionandairinletflowratesmayalsoberecordedforcombustionpoweredvehicles,andtheseoftenrequireadjustmenttothestandardengineintakeequipment.Wherethes

8、ystemiscontrolledbyacomputer,processingpoweranduserinterfacesvarygreatly.Thesimplestformsmaycons