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Diesel Particulate Filter
Regeneration
The diesel particulate filter (DPF) is part of the exhaust
system. The diesel-oxidation catalyst of the DPF
reduces harmful gasses and the soot filter removes
soot from the engine exhaust.
The DPF regeneration process uses heat from the
engine exhaust to incinerate the soot accumulated on
the soot filter, converting the soot to ash, and clears
the channels of the soot filter so that filtered engine
exhaust flows out the DPF.
The engine computer monitors the accumulation of
soot by measuring the back pressure in the DPF. If
the back pressure is too high, soot is not incinerating
in the soot filter through normal engine operation. To
keep the DPF clear of soot, remember the following:
•
Passive regeneration occurs continuously while
the engine is running—run the engine at full
engine speed when possible to promote DPF
regeneration.
•
If the back pressure is too high, the engine
computer signals you through the display
when additional processes (assist and reset
regeneration) are running.
Operate and maintain your machine with the function
of the DPF in mind. Engine load, at high idle
engine speed, generally produces adequate exhaust
temperature for DPF regeneration.
Important:
Minimize the amount of time that you
idle the engine or operate the engine at low-engine
speed to help reduce the accumulation of soot in
the soot filter.
CAUTION
The exhaust temperature is hot (approximately
600°C (1,112°F) during DPF parked
regeneration or recovery regeneration. Hot
exhaust gas can harm you or other people.
• Never operate the engine in an enclosed
area.
• Make sure that there are no flammable
materials around the exhaust system.
• Never touch a hot exhaust system
component.
• Never stand near or around the exhaust
pipe of the machine.
DPF Soot Accumulation
•
Over time, the DPF accumulates soot in the soot
filter. The computer for the engine monitors the
soot level in the DPF.
•
When enough soot accumulates, the computer
informs you that it is time to regenerate the diesel
particulate filter.
•
DPF regeneration is a process that heats the DPF
to convert the soot to ash.
•
In addition to the warning messages, the computer
reduces the power produced by the engine at
different soot-accumulation levels.
Refer to the Software Guide for fault messages and
recommended actions.
DPF Ash Accumulation
•
The lighter ash is discharged through the exhaust
system; the heavier ash collects in the soot filter.
•
Ash is a residue of the regeneration process. Over
time, the diesel particulate filter accumulates ash
that does not discharge with the engine exhaust.
•
The computer for the engine calculates the amount
of ash accumulated in the DPF.
•
When enough ash accumulates, the engine
computer sends information to the display in the
form of a system advisory or an engine fault to
indicate the accumulation of ash in the DPF.
•
The advisory and faults are indications that it is
time to service the DPF.
•
In addition to the warnings, the computer reduces
the power produced by the engine at different
ash-accumulation levels.
Refer to the Software Guide for fault messages and
recommended actions.
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