Aftertreatment Operation
i06860403
Diesel Particulate Filter
Regeneration
Regeneration
The 2206F has two different types of aftertreatment
systems. One system has an Aftertreatment
Regeneration Devise (ARD) the other system will not
have the ARD installed.
Engines without ARD
The turbocharger compressor bypass valve is
connected between the air inlet to the turbocharger
and the boost pressure from the turbocharger. The
turbocharger compressor bypass valve will activate
to increase exhaust temperatures when needed to
regenerate the aftertreatment system. Regeneration
includes converting soot in the Diesel Particulate
Filter (DPF) into gas, removing sulfur from Selective
Catalytic Reduction (SCR) system, and removing
crystals from the Diesel Exhaust Fluid (DEF) injector.
Engines with ARD
Engines that are equipped with an ARD will not have
the turbocharger compressor bypass valve installed.
Regeneration Indicators
Regeneration Active – When
illuminated, this indicator shows that
regeneration is active and exhaust
temperatures are elevated.
DPF – This indicator will illuminate to
show that regeneration is required.
Regeneration Triggers
There are four methods for triggering regeneration:
Soot: The DPF will collect soot produced by the
engine. Automatic regeneration will become active to
reduce soot level.
Crystal Removal: Regeneration is necessary to
remove crystals that form inside the DEF injector
during a hot shutdown and/or during extended
operation at low ambient temperatures.
HC Evap To evaporate Hydrocarbons that can
accumulate in the DPF, when operating at cold
exhaust temperatures regeneration is necessary.
Running HC Evap regenerations protects the DPF
against possible thermal events.
Desulfation Regeneration To keep the SCR catalyst
free of sulfur, and the DEF injector and mixing tube
clean of DEF deposits, regeneration is necessary.
Regeneration System Warning
Indicators
Illustration 41 g02117258
The DPF Indicator will illuminate solid when
regeneration is required. Regeneration should be
performed as soon as possible.
Note: In some situations, the DPF indicator may stay
illuminated after regeneration ends. The illuminated
DPF indicator indicates that complete regeneration
has not been performed. Complete regeneration is
when the soot has been depleted or all the criteria for
one of the other regeneration types have been met. If
the DPF indicator stays illuminated, perform
regeneration without interruption. The DPF indicator
will shut off when regeneration is complete.
If the soot or sulfate percentage is above a threshold,
then regeneration is required which will illuminate the
DPF indicator. If the machine continues to operate
without regeneration, then derate of engine will
eventually occur. To avoid derates and further issues,
the machine must be put to work so that exhaust
temperature can get high enough to regenerate
system. If a fault is active, the active fault may
prevent the engine from achieving high exhaust
temperatures. Troubleshoot and fix fault before
proceeding.
52
SEBU9071-01
Operation Section
Aftertreatment Operation
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