Audiovox Prestige Platinum APS-250 Specifications download pdf (Page 18)

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RE&T: 2011 Source Book

July2010

F-250/F-350/F-450

SD Pickups

F-250/F-350/F-450

Super Duty

Pickups

Performance/Handling

— Diesel Engine Emissions Overview

— Power Stroke Emissions Strategy

— Exhaust Gas Recirculation (EGR)

— Diesel Oxidation Catalyst (DOC)

— Selective Catalytic Reduction (SCR)

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2011

Diesel Engine Emissions

Overview

• Thecombustionsystemistheheartoftheall-new

6.7L Power Stroke

V8 turbo diesel engine and reflects

how Ford engineers achieved a balance of power, fuel

efficiency and reduced emissions

• Thekeyfactortothemore-stringent2010federal

emissions standards is over 80 percent reduction in the

emission of nitrogen oxides (NOx)

• TohelpreduceNOxlevels,theall-newPowerStroke

burns cleaner in large part because of the new Exhaust

Gas Recirculation (EGR) system

• Inaddition,thereisathree-stepaftertreatmentsystem

utilizing a Diesel Oxidation Catalyst (DOC), Selective

Catalytic Reduction (SCR) using Diesel Exhaust Fluid

(DEF) and Diesel Particulate Filter (DPF) as the key

components

• ThissystemworksinharmonytoreducetheNOx

levels within the new federal standards — making the

6.7L Power Stroke the “cleanest” Ford Power Stroke

diesel engine ever

Power Stroke Emissions Strategy

• Allowstheenginetooperatewithaleanerfuelmixture

than previous Power Stroke engines

• Aleanerfuelmixturehaslessfuelandmoreair

• Leanerburningenginesproducelessparticulate

emissions

• Lessparticulateemissionsresultinlessfrequent

DPF regeneration

• Lessfrequentregenerationhelpsimproveoverall

engine fuel efficiency

Exhaust Gas Recirculation (EGR)

• Recyclescombustiongasesintheexhaustsystemas

the first defense against NOx

• Atwo-stepcoolingprocessallowstheEGRtorecycle

exhaust gases into the intake at a much lower

temperature

• Acoolertemperaturemeansahigherefficiencyin

recycling the exhaust gases and less oxygen in the mix

• LessoxygenhelpsreducetheformationofNOxin

the exhaust

Diesel Oxidation Catalyst (DOC)

• Thefirststepintheexhaustaftertreatmentprocessand

could be referred to as the cleaning and heating step

• Convertsandoxidizeshydrocarbonsintowaterand

carbon dioxide

• Providesandpromotesheatintotheexhaustsystem

to help increase the conversion efficiency

Selective Catalytic Reduction (SCR)

• Thesecondstepintheexhaustaftertreatment

process, primarily where NOx is removed from

the exhaust stream

• LocatedbetweentheDOCandtheDPFinthe

exhaust system

• Usesaliquidchemicalreactant,DieselExhaust

Fluid (DEF)

• DEFDosingModulespraysafinemistofDEFintothe

exhaust stream to react with the NOx in the exhaust

as it passes through the SCR Catalyst

– When heated, DEF splits into ammonia and

carbon dioxide

• Thesemoleculesareatomizedandvaporizedand

evenly distributed into the exhaust flow

• OncetheDEFsolutioniscombinedwiththeexhaust

flow, chemical reactions convert the ammonia and

NOx into water and harmless nitrogen

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Audiovox Prestige Platinum APS-250 Specifications Page 18

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