Operators Manual

Table Of Contents
EPA10 Aftertreatment System
To meet EPA10 emission regulations, the traditional muffler was replaced by an
Aftertreatment Device (ATD). The ATD consists of a Diesel Oxidation Catalyst
(DOC), a Diesel Particulate Filter (DPF), and a Selective Catalyst Reduction (SCR)
system. These components burn off collected particulate matter in a process called
"regeneration" and reduce nitrous oxides (NOx). The key to successful regeneration
is high exhaust temperature for an extended period of time. Without adequate
temperatures for regeneration, the filter will continue to trap particulates and
eventually plug. In order to avoid DPF plugging, Detroit™ uses an actively
regenerated Aftertreatment System (ATS).
The exhaust from an on-highway diesel engine produces levels of nitrous oxide
(NOx) that must be reduced. To meet EPA10 emission standards, a Selective
Catalyst Reduction (SCR) system has been added to the current ATS. The SCR
system consists of an Aftertreatment Control Module (ACM), a tank for Diesel
Exhaust Fluid (DEF), a DEF pump module, an air control unit, a DEF metering
unit, a DEF injector, and an SCR module. DEF is pumped through the metering
unit to a DEF injector. The DEF injector meters DEF into the SCR module to
produce a chemical reaction. This chemical reaction converts nitrous oxides (NOx)
present in the exhaust stream into water vapor and nitrogen.
There are two different configurations available for different types of applications.
Both configurations reduce the particulate matter more commonly known as soot
and NOx generated by the engine.
1-BOX™ Aftertreatment Device
The "1-BOX™" configuration contains the Diesel Oxidation Catalyst (DOC) /
Diesel Particulate Filter (DPF) and the Selective Catalytic Reduction (SCR
Catalyst) in one single enclosed box.
DD Heavy Duty Platform Operators Manual
All information subject to change without notice. 85
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