Diesel Exhaust Emissions
PM and NOx After treatment
Terminology
TECHNICAL TERM
CUSTOMER TERM
OTHER COMMON TERMS
Aftertreatment System
Exhaust Filter System
Aftertreatment System
Exhaust 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 emissions
from 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