Toro Groundsmaster 4500-D Operator's Manual page 35

Types of Diesel Particulate Filter Regeneration
Types of diesel particulate filter regeneration that are performed while the machine is operating:
Type of Regeneration
Passive
Assist
Reset
Types of diesel particulate filter regeneration that require you to park the machine:
Type of Regeneration
Parked
Conditions for DPF regeneration
Occurs during normal operation of the machine at
high-engine speed or high-engine load
Occurs as a result of low-engine speed, low-engine
load, or after the computer detects back pressure
in the DPF
Occurs after assist regeneration only if the
computer detects that assist regeneration did not
sufficiently reduce the soot level
Also occurs every 100 hours to reset baseline
sensor readings
Conditions for DPF regeneration
Soot buildup occurs as a result of prolonged
operation at low-engine speed or low-engine load.
May also occur as a result of using incorrect fuel
or oil
The computer detects back pressure due to soot
buildup and requests a parked regeneration
DPF description of operation
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.
Refer to Passive DPF Regeneration (page
When the assist/reset-regeneration icon
is displayed in the InfoCenter, an assist
regeneration is in progress.
During assist regeneration, the computer controls
the intake throttle to increase the exhaust
temperature, enabling assist regeneration to occur.
Refer to Assist DPF Regeneration (page
When the assist/reset-regeneration icon
is displayed in the InfoCenter, a regeneration is in
progress.
During reset regeneration, the computer controls
the intake throttle and fuel injectors to increase the
exhaust temperature during regeneration.
Refer to Reset Regeneration (page
DPF description of operation
When the parked-regeneration icon
is displayed in the InfoCenter, a regeneration is
requested.
• Perform the parked regeneration as soon as
possible to avoid needing a recovery regeneration.
• A parked regeneration requires 30 to 60 minutes
to complete.
• You must have at least a 1/4 tank of fuel in the
tank.
• You must park the machine to perform a recovery
regeneration.
Refer to Parked Regeneration (page
35
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