Diesel Particulate Filter - Toro Groundsmaster 4500-D Series Service Manual

Diesel Particulate Filter

Regeneration
Types of regeneration that are performed automatically (while the machine is operating)
Type
Passive
Assist
Reset
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
The diesel particulate filter (DPF) used on Yanmar Tier 4 compliant engines is
designed to breakdown the hazardous elements in the exhaust and prevent the
discharge of unburnt fuel or oil known as particulate matter or soot. The DPF
includes a Diesel Oxidation Catalyst (DOC), a Soot Filter (SF), 2 temperature
sensors, and a pressure differential sensor. Additional information regarding the
Diesel Particulate Filter (DPF) can be found in the Yanmar Operation Manual –
Industrial Engines TNV supplied with your machine.
The engine ECU monitors the exhaust pressure before and after the soot filter
in the DPF to determine if soot is accumulating. If soot is accumulating during
normal engine operation, the pressure differential will increase. The increase
in pressure will signal the engine to begin a process called regeneration.
Regeneration increases the exhaust temperature and the length of time the
engine operates at a higher than normal exhaust temperature, incinerating the
built up soot and turning it into ash. The different types of regeneration used are
listed in order based on the amount of particulate matter in the soot filter (least to
most). The length of time the engine will operate at a higher than normal exhaust
temperature to burn out the soot is also related to the amount of particulate
matter in the soot filter.
Conditions
Occurs during normal operation of the
machine at high engine speed or high
engine load.
Occurs because of prolonged operation
at low engine speed, low engine load,
or when the engine ECU detects the
soot filter is becoming obstructed.
Occurs every 100 hours of engine
operation.
Occurs after an assist regeneration if
the engine ECU determines the assist
regeneration did not sufficiently reduce
the soot level.
Description
The DPF processes high heat exhaust
gasses, oxidizing harmful emissions
and incinerating soot to ash.
Passive regeneration occurs as part of
normal engine operation.
The InfoCenter does not display an icon
during passive regeneration.
While operating the machine, run the
engine at full-engine speed and high
load when possible to promote DPF
regeneration.
The engine ECU adjusts the exhaust
intake throttle to raise the exhaust
temperature.
The InfoCenter does not display an icon
during assist regeneration.
engine setting to raise the exhaust
temperature.
The engine ECU adjusts the exhaust
intake throttle and the injector timing to
raise the exhaust temperature.
Do not shut off the engine or reduce
the engine speed while the reset
regeneration is processing.
Page 4–7 Yanmar Diesel Engine: General Information
The engine ECU adjusts the