Audiovox Prestige Platinum APS-250 Spécifications télécharger pdf (Page 19)

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RE&T: 2011 Source Book

July2010

F-250/F-350/F-450 F-250/F-350/F-450 F-250/F-350/F-450

SD Pickups

— SCR Competitive Advantages

— Absorber vs. Adsorber

on this page

F-250/F-350/F-450

Super Duty

Pickups

Performance/Handling

2011

Diesel Engine Emissions cont’d

MAKE THE POINT: SCR Competitive Advantages

The Selective Catalytic Reduction (SCR) has strong advantages over the competitive lean NOx trap system, similar

to what a customer would find in a Dodge Ram Pickup truck.

Lean NOx Trap

• Dieselenginesnormallyoperatewithanexcess

ratio of air-to-fuel (also known as “lean” operation)

• ALeanNOxTrap(alsoknownasaNOxAdsorber

Catalyst) chemically traps the NOx in the exhaust

on the surface of the catalyst during lean engine

operation

• Asthesurfaceofthetrapbecomesfull,thesystem

triggers the engine to run rich (increases the fuel-to-

air ratio) to clean the trap

SCR Advantages

• DesignedforgreaterfuelefficiencycomparedtoLean

NOx Trap

• LeanNOxTrapsystemsconstantlycyclebetweenalean

and a rich fuel mix, which consumes more fuel than an

SCR system

• LeanNOxTrapsalsotrapthesulfurindieselfueland

can become clogged, requiring a higher temperature

regeneration to remove the sulfur from the trap

• It’sexpectedthatinthefutureallOEMswillrelyon

this technology

ENGINEERING INSIGHT

Absorber vs. Adsorber

What’s an Absorber?

We’reallfamiliarwithsomethingthatabsorbs:asponge.Aspongesoaksup(absorbs)aliquidfromtheoutside

and stores the liquid internally until full. Once the sponge is full, it stops absorbing and can only take on additional

liquid if drained (squeezed).

What’s an Adsorber?

An adsorber, on the other hand, attracts and holds particles on an outer surface – similar to a pleated filter on a

vacuum cleaner, a furnace filter or charcoal granules in a vapor canister.

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Audiovox Prestige Platinum APS-250 Spécifications Page 19

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