Volvo EPA2007 D13F - Idler Tensioner; Oxides of Nitrogen (Nox); Passive Regeneration; Poly-V Belt

172Glossary
IdlerTensioner
Abelttensioningdevicedesignedtomaintainoptimumtensionundervaryingengine
speedsandload.
OxidesofNitrogen(NOx)
Hightemperaturesandpressuresofcombustionproduceoxidesofnitrogen(NOx).
Whencombustiontemperatureexceeds1372°C(2,500°F),oxygenandnitrogen
combineinlargequantitiestoformNOx.Bythemselves,NOxemissionsareno
greathazard;however,whenmixedwiththerightamountofHCintheair,NOxwill
combineinthepresenceofsunlighttoformsmog.
PassiveRegeneration
Cleaningaparticulatelterbyspontaneousburningofsootthatcollectsonit.The
exhausttemperatureremainscontinuouslyhighenoughtoincineratethesoot.
Poly-VBelt
Amulti-ribbedbeltdesignincorporatedintotheaccessorydrivebeltandpulley
arrangementatthefrontoftheengine.
Regeneration
Cleaningadieselparticulateltersoastorenewitscapacitytofunctionefciently.
RollerFollower
Atypeofrockerarmwithanaxle-mountedrollerthatrideson(orfollows)acamshaft
lobe.Therollingmotionofthisdesignprovidesincreasedloadcapacitywithless
frictionthantheat-facedrockerarmdesign.Rollerfollowersprovidetherockerarm
liftingactionfortheelectronicunitinjector,intakeandexhaustvalvesandexhaust
brake.