Volvo EPA2007 D13F - COMPONENT PART NUMBER LOCATOR

ENGINECOMPONENTANDLOCATION115
DieselParticulateFilter
Basicallyatrap,adieselparticulatelter(DPF)collectsthesootandashtohold
untiltheycanbeburnedoff.AcatalyzedDPFalsotransformsunburnedfuel,engine
lubricantandcarbonmonoxideintocarbondioxideandwater.
Dependingonvehiclevocation,theoperatingtemperatureoftheexhaustmayor
maynotbesufcienttoconsumethetrappedsootandash.Ifnecessary,ameansof
elevatingthetemperatureisincludedinthesystem.
FilterRegeneration
Cleaningaltersoitcancontinuetofunctioniscalled"regeneration."Highheatwith
acatalystbreaksdownthechemicalproperties.Dependingonthevehicleusage,the
enginewillbeequippedwithapassiveoranactiveregenerationsystem.
Aswithanylter,eventuallytheDOCandtheDPFwillbecomeclogged.Risingback
pressurecausedbypluggingtheexhaustsystemdecreasesfueleconomyandreduces
engineefciency.Itisnecessarytocleantheseltersfromtimetotime.
Thelterscanberegeneratedtocontinueinuse.Thehightemperatureneededto
completetheprocessexistsintheexhaustitself.Becausesomevehiclevocationsdo
notallowtheexhausttemperaturetoriseto,orcontinueat,adequatelevels,adevice
tocontrolthetemperatureisincluded.
PassiveRegeneration
Forvehiclesthatproduceandmaintainadequateexhausttemperature,thesootandash
areconsumedataratethatpreventscloggingthelterprematurely.SettingaDOC
aheadofthecatalyzedDPFintheexhauststreamreducesthetemperaturerequired
toregeneratethelters.
However,theprocessisnotcomplete.Eventually,theltermustbetakenoutto
removetheaccumulatedresiduebyothermeans.