Toro 72144 Software Manual page 6

If the engine ECU senses that the DPF
backpressure has increased past an acceptable
threshold, an auto regeneration will occur.
During the auto 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. The auto
regeneration is completed when needed. The
machine can continue to be used during an auto
regeneration.
The following figures show the screens of the
auto regeneration process.
Figure 5
1. Start of Auto Regen
When the engine ECU determines that an auto
regeneration is needed, the alarm chirps and the
module displays the Start of Auto Regen screen
with a 60-second bar graph timer
Once the timer expires, the auto regeneration
process begins.
Note:
No action is required and you can
continue to use the machine during the auto
regeneration process.
CAUTION
During the auto regeneration process,
the exhaust temperatures rise and could
ignite flammable materials.
Use caution if you operate the machine
around flammable materials.
If an auto regeneration is needed but operating
conditions do not allow the process to begin,
the module prompts you to increase the engine
speed and/or load.
1. Increase RPM/Load
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1. Auto Regen Active
(Figure 5).
1. Regen Interrupted
3.
6
Figure 6
When the process begins, the screen changes
to indicate that the auto regeneration process
is active.
Figure 7
If the regeneration is interrupted, the following
screen displays:
Figure 8
Note:
If you shut off the engine during the
regeneration process, the process resumes
when you start the engine and it reaches the
required temperature level.
Stationary Regeneration
Over time, soot accumulates in the DPF and a
passive or auto regeneration is not sufficient
to unclog the filter. 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.
If a stationary regeneration is required, it
may indicate that the engine has been idling
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