汽车检测站设计外文翻译.doc

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

2、aadirectconnectiontothevehicle’swheelhubs,orthroughasetofrollers,whicharerotatedbythewheelsofthetestvehicle.Flywheelsand/oramotoringcapabilitymayalsobeincludedifvehicleinertiaistobesimulated.Descriptionsofinertiasimulationandthemodellingofvariousvehicleforcesareinclude

3、dinChapter3.Systemsthatincorporateasetoflargerollers(onerollerforeachdrivenwheel)aremorecommoninapplicationsrequiringlongtermrunningofthevehicle,inwhichtyreoverheatingcanoccur.Hubdynamometersarebestsuitedtoenginetuningapplicationswhichdemandrapidresponseandminimalset-u

4、ptimebetweentests.AcommonandversatiledynamometerlayoutconsistsofasingleDCorACmachinemountedoutsidetherollersandonthesameaxis,asshowninFigure2.1..Outputpowerismostcommonlyabsorbedbyhydraulicorelectricmachines—alsoknownasdynamometers—whichdissipatepowereitherasheatorelec

5、tricalenergy.Asingleunitthatcanperformbothmotoring(poweroutput)andgenerating(powerabsorption)functionsisacommonfeatureincommerciallyavailablechassisdynamometers.Allbutthesimplestofgaragetuningdynamometersincludethecapacitytomeasuretheequivalentroadspeedandtractiveforce

6、appliedatthevehicle’swheels.Chassisdynamometersforin-depthdrivingcycleandvehiclemappingtestscustomarilyincorporatemanydifferentmeasuringdevices,whicharesampledandrecordedbyacomputer-controlleddataacquisitionsystem.Commonfeaturesofinterestduringadynamometertestincludeth

7、eexhaustemissions(suchasCO,CO2,NOXandunburnthydrocarbons),vehiclecoolingwaterandoiltemperatures,andofcoursetractiveforceandpoweroutput.Fuelconsumptionandairinletflowratesmayalsoberecordedforcombustionpoweredvehicles,andtheseoftenrequireadjustmenttothestandardengineinta

8、keequipment.Wherethesystemiscontrolledbyacomputer,processingpoweranduserinterfacesvarygreatly.Thesimplestformsmaycons