Understanding the Diesel-Particulate Filter and
Regeneration (continued)
Types of Diesel Particulate Filter Regeneration
Types of diesel particulate filter regeneration that are performed while the
machine is operating:
Type of
Regeneration
Conditions that cause DPF
regeneration
DPF description of operation
Passive Occurs during normal operation of the
machine at high-engine speed or high-
engine load
• The InfoCenter does not display an
icon indicating passive regeneration.
• During passive regeneration, the DPF
processes high-heat exhaust gasses,
oxidizing harmful emissions, and
burning soot to ash.
Assist Occurs because of low-engine speed,
low-engine load, or after the computer
detects the DPF is becoming obstructed
with soot
• The InfoCenter does not display an
icon indicating assist regeneration.
• During assist regeneration, the engine
computer adjusts the engine settings
to raise the exhaust temperature.
Reset Occurs every 100 hours
Also occurs if normal engine operation
surpasses the allowed soot accumulation
amount within the filter
• When the high exhaust-temperature
icon is displayed in the
InfoCenter, a regeneration is in
progress.
• During reset regeneration, the engine
computer maintains an elevated
engine speed to ensure filter
regeneration.
3464-482A Page 5–23 Operation: During Operation
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