User Manual

The wall flow Diesel Particulate Filter (DPF) is
designed to contain all the ash up to the ash service
interval. Refer to Operation and Maintenance Manual
for more information.
No ash service is required for the through flow Diesel
Particulate Filter (DPF).
The engine aftertreatment system is designed to
oxidize the soot in the DPF at the same rate as the
soot is produced by the engine. The oxidization of the
soot will occur when the engine is operating under
normal conditions. The soot in the DPF is constantly
monitored.
The regeneration system is passive with an
additional Oxy-Exotherm system. The Oxy-Exotherm
system operates by injecting fuel after the main fuel
injection period. The fuel is then burnt over a catalyst
to raise the temperature of the exhaust gases to
650° C (1202° F).
If the engine is operated in a way that produces more
soot than the oxidized soot, the engine management
system will automatically activate systems to raise
the exhaust temperature. The raising of the exhaust
temperature will ensure that more soot is oxidized
than the soot that is produced by the engine. The
oxidization of more soot returns the DPF to a reduced
level of soot. The systems are then deactivated when
the soot level has been reduced.
The engine ECM must know how much soot is in the
DPF. Measurement of soot is accomplished through
the following means:
• Soot Load Estimation Model that is based on
engine operating conditions
• Delta pressure measurement across the DPF
used to estimate the soot load by evaluation of the
flow resistance of the Diesel Particulate Filter
(DPF)
The Electronic Control Module (ECM) uses the soot
measurement information to determine if the engine
operating conditions need to be adjusted in order to
oxidize the soot at an increased rate.
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Cooling System
Introduction
The cooling system has the following components:
• Radiator
• Water pump
• Cylinder block
• Oil cooler
• Exhaust gas cooler (NRS)
• Cylinder head
• Water temperature regulator (thermostat)
UENR0623-02 19
Engine Operation
This document has been printed from SPI2. NOT FOR RESALE