3–1
T-378
SECTION 3
DESCRIPTION
3.1 Engine Emission System (EES) Overview
In a diesel engine exhaust system, unburned diesel fuel results in soot accumulation. This can cause clogging in
the filter which in turn causes engine exhaust back pressure to become too high. The Engine Emission System
(EES), is an optional system that removes most of the soot particles from the exhaust. By removing the soot
particles, cleaner air is discharged out of the exhaust system during operation and back pressure is reduced. The
EES also functions as the muffler when installed and reduces the exhaust related noise emitted from the unit.
The process of burning off the particulate matter in the EES is called Regeneration. This is where temperature is
increased to a level that oxidizes the captured soot, leaving only (fine) inorganic ash and significantly reducing
for a further explanation of Regeneration.
The major components of the ESS are the Exhaust System, Fuel Injector (Doser), Emissions Control Module
(ECM), and Air Control Valve (ACV). Refer to
Figure 3.1 Engine Emission System (EES) Components
1) Exhaust System
2) Fuel Injector (Doser)
3) Emissions Control Module (ECM)
4) Air Control Valve (ACV)
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