Toro Groundsmaster 4500-D Service Manual page 23

Assist regeneration occurs if the engine ECU senses
that the DPF backpressure has increased to its maxim-
um threshold. During assist regeneration, the intake
throttle valve limits the air flow into the engine while the
injectors add additional fuel. This process increases the
DPF temperature which allows accumulated particulate
to burn off, without changing the load on the engine.
Burning of the accumulated PM decreases the pressure
across the DPF. The assist regeneration is completed
automatically when necessary. A small icon will be dis-
played on the InfoCenter during assist regeneration
(Fig. 5) to inform the operator. The machine can contin-
ue to be used during an assist regeneration.
Reset regeneration takes place at a time interval
(every 100 hours) to reset the baseline sensor readings
in the DPF. The reset regeneration ensures that the en-
gine is running at peak efficiency. During this mode, post
injection is the means of increasing the DPF temperat-
ure. The reset regeneration is completed automatically
when necessary. A small icon will be displayed on the In-
foCenter during reset regeneration (Fig. 5) to inform the
operator. The machine can continue to be used during
a reset regeneration.
NOTE: If the engine is turned off during an assist or re-
set regeneration process, the regeneration will resume
once the engine is restarted and required temperature
level is reached.
Stationary regeneration is requested by the engine
ECU if the assist and reset regenerations do not return
the DPF particulate level to an acceptable level. During
the stationary regeneration, the engine ECU controls
engine speed, load and air/fuel mixture to perform a
controlled burn of the particulate collected in the DPF.
This type of regeneration is not a normal condition and
may indicate that the DPF will require service soon, that
an engine problem exists (e.g. incorrect engine fuel or
oil) or that a DPF pressure sensor is failing. If a station-
ary regeneration is necessary, an advisory will occur on
the InfoCenter and the necessary steps will be listed. A
large icon will be displayed on the InfoCenter instead of
the temperature gauge during stationary regeneration
(Fig. 5). During the stationary regeneration process, the
InfoCenter display will identify the percent completed
during the process. The machine cannot be used during
a stationary regeneration.
Groundsmaster 4500--D/4700--D
When the regeneration process is completed, the In-
foCenter will remove the stationary regeneration icon
and cease periodic regeneration messages. The engine
will return to low idle speed with operator controls re-
turned to normal.
IMPORTANT: A stationary regeneration should
ONLY be initiated if an InfoCenter display advisory
requests that this be done.
IMPORTANT: During a stationary regeneration,
make sure that the machine is parked on a hard,
level surface in a well ventilated area. This process
runs the machine at a higher exhaust temperature
for a period of approximately thirty (30) minutes to
burn off collected particulate in the DPF.
ASSIST OR RESET
REGENERATION
ICON
STATIONARY
REGENERATION
REQUEST
ICON
STATIONARY
REGENERATION
IN PROCESS
ICON
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Figure 5
Yanmar Diesel Engine