Diesel Exhaust Emissions

PM and NOx After treatment

Terminology TECHNICAL TERM CUSTOMER TERM OTHER COMMON TERMS

Aftertreatment System Exhaust Filter System Aftertreatment SystemExhaust Filter•Diesel Oxidation Catalyst (DOC)•Diesel Particulate Filter (DPF)

Exhaust Filter•Diesel Oxidation Catalyst (DOC)•Diesel Particulate Filter (DPF)

Aftertreatment Device (ATD)•Diesel Oxidation Catalyst (DOC)•Diesel Particulate Filter (DPF)

Regeneration•Passive•Active (Auto)•Parked (Manual)•Service

Exhaust Filter Cleaning•Natural•Auto•Manual•Service

Regeneration•Passive•Active (Auto)•Parked (Manual)•DPF Recovery

Fuel Dosing System Fuel Dosing System Hydrocarbon Dosing System

Particulate Matter (PM) Soot Soot Particulate Matter

Ash Ash Ash

Ash Removal Ash Removal Ash Cleaning

Diesel Emissions Controls Today, viable emission control technologies exist to reduce exhaust emissionsfrom existing diesel vehicles.

Retrofit technologies designed to control particulate matter (PM) include:

• Diesel oxidation catalysts (DOCs)• Diesel particulate filters (DPFs)• Flow through filters (FTFs)• Closed crankcase ventilation (CCV)Retrofit technologies designed to control oxides of nitrogen (NOx) include:• Exhaust gas recirculation (EGR)• Selective catalytic reduction (SCR)• Lean NOx catalysts (LNCs or HC-SCR)• Lean NOx traps (LNTs)

Diesel Oxidation Catalyst

Diesel Oxidation Catalyst• Like catalytic converters already used on all gasoline vehicles, diesel

oxidation catalysts (DOCs) cause chemical reactions to reduce emissions without any moving parts.

• The catalysts reduce particle emissions by as much as 50%, can reduce visible smoke, and eliminate the odor of diesel exhaust.

• The catalysts can reduce the invisible ozone forming hydro-carbon gases by more than 70% and CO by up to 90%

• DOCs are used in new vehicles and can be installed on retrofitted vehicles already in use.

• Can be used with D2, biodiesel, emulsified diesel, ethanol/diesel blends and other alternative diesel fuels

• Usually not a Level 3 device

Diesel Particulate Filter Sintered Metal or Wire Mesh

Diesel Particulate Filter Wall-flow Monolithic Substrate

Wall Flow DPF

DOC / DPF

Diesel EGR

LOW pressure EGR With DPF

2010 On-Highway

2010 SCR w/ DEF system