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1、Thispaperispostedontheauthor’sorganizationalwebsitewithpermissionfromSAEInternational.Itmaynotbeshared,downloaded,duplicated,ortransmittedinanymanner,orstoredonanyadditionalrepositoriesorretrievalsystemwithoutpriorwrittenpermissionfromSAE.2013-01-0923Published04/08/2013Copyrigh
2、t©2013SAEInternationaldoi:10.4271/2013-01-0923saeeng.saejournals.orgEliminatingEnginePerformanceDegradationOverTimeThroughCompressorRedesignEricKrivitzkyConceptsNRECMasashiYamamotoMitsubishiFUSOTruckandBusCorp.ABSTRACTCommerciallyavailableturbochargedinternalcombustionenginesre
3、quirerobustsystemperformancetomaintaindrivelinepoweroutputcapability.Asin-serviceruntimeincreases,theaccumulationofwearordepositscanadverselyaffectcomponentperformancelevels.Inaworst-casescenario,thecomponentperformancedegradationleadstoaviciousloopofdecliningsystemperformance.
4、Endurancetestingofaheavy-dutydieselenginerevealedperformancedeteriorationovertime.Oildeposits,resultingfromoilmistassociatedwiththeclosedcrankcaseventilationloop,wereobservedontheturbochargercompressorandweretiedtothedeterioration.Cleaningofthecompressorrecoveredinitialperforma
5、nceforashortperiodoftime.Adifferentmodelofturbocharger,whensubstitutedfortheoriginal,didnotshowthesamedegradationinoutput.Thispaperpresentsastudyintotheresponsiblemechanismsforperformancedeteriorationandthecompressorredesignthatsuccessfullyavoidedtheseissues.Theresultsofnumeric
6、alandphysicalinvestigationsaimedatmitigatingthesystemimpactarediscussed,startingwithanoverviewoftheobservedengineandcompressorperformancedecline,andanoutlineofpotentialareasofperformancesensitivitytooilaccumulation.Ultimately,thedegradationofsystemperformancewastiedtothesystemr
7、esponseofdeterioratingcompressorcharacteristics.Acompressorwasredesignedandendurancetestedtoverifythattheadjustmentofengine-compressormatchingandcompressorcharacteristicsresultsinimprovedrobustnesstooil-mistrelatedperformancedegradation.CITATION:Krivitzky,E.andYamamoto,M.,"Elim
8、inatingEnginePerformanceDegradationOverTimeThroughComp
