Engine Operation
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Engine
Operation
Proper
operation
and
maintenance
are
key
factors
in
obtaining
the
maximum
life
and
economy
of
the
engine.
If
the
directions
in
the
Operation
and
Maintenance
Manual
are
followed,
costs
can
be
minimized
and
engine
service
life
can
be
maximized.
The
time
that
is
needed
for
the
engine
to
reach
normal
operating
temperature
can
be
less
than
the
time
taken
for
a
walk-around
inspection
of
the
engine.
The
engine
can
be
operated
at
the
rated
rpm
after
the
engine
is
started
and
after
the
engine
reaches
operating
temperature.
The
engine
will
reach
normal
operating
temperature
sooner
during
a
low
engine
speed
(rpm)
and
during
a
low-power
demand.
This
procedure
is
more
effective
than
idling
the
engine
at
no
load.
The
engine
should
reach
operating
temperature
in
a
few
minutes.
Gauge
readings
should
be
observed
and
the
data
should
be
recorded
frequently
whilst
the
engine
is
operating.
Comparing
the
data
over
time
will
help
to
determine
normal
readings
for
each
gauge.
Comparing
data
over
time
will
also
help
detect
abnormal
operating
developments.
Significant
changes
in
the
readings
should
be
investigated.
If
a
Diesel
Particulate
Filter
(DPF)
equipped
aftertreatment
system
are
installed,
avoid
excess
idling.
Excessive
idling
causes
soot
loading
of
the
DPF.
Also,
excessive
idling
will
create
carbon
buildup
and
engine
slobber.
These
issues
are
harmful
to
the
engine.
Reduction
of
Particulate
Emissions
Two
different
types
of
aftertreatment
systems
are
available.
• Diesel Oxidation Catalyst (DOC) and Selective
Catalytic Reduction (SCR)
• Diesel Oxidation Catalyst (DOC) Diesel
Particulate Filter (DPF) and Selective Catalytic
Reduction (SCR)
On DOC and SCR aftertreatment system particulate
emissions are reduced during combustion and so
there is no soot or ash stored in the aftertreatment.
Also, there is no regeneration event to consider.
On DPF equipped aftertreatment system the DPF will
reduce particulate emissions. The DPF collects the
soot and any ash that is produced by the combustion
in the engine. During regeneration, the soot is
converted into a gas which is released into the
atmosphere. The Ash remains in the DPF.
The temperature of the DPF must be above a
particular value in order for regeneration to occur.
The exhaust gas provides heat for the regeneration
process.
Passive Regeneration
– The engine provides
sufficient exhaust gas temperature for regeneration.
Passive regeneration will only be performed on
aftertreatment systems that have a DPF installed.
Passive regeneration is the process that is used by
the DPF to remove soot from the DPF. In some
applications, the engine idle speed will automatically
be increased to allow passive regeneration to occur.
During passive regeneration, the back pressure valve
is used to increase exhaust back pressure. This
increase in pressure is to raise exhaust temperatures
so that the aftertreatment system can regenerate
efficiently.
During operation of the back pressure valve, trace
amounts of exhaust gas may escape from the
connections in the exhaust system.
Elevated Idle for Aftertreatment
Continuous low load operation may lead to the
elevation of engine low idle speed to 1200
Revolutions Per Minute (RPM). The elevation of
engine low idle speed is part of the aftertreatment
management. The engine will only elevate low idle
when required and safety interlocks are in place. The
engine can continue to be operated as normal.
Operating the engine for longer periods at higher
load will reduce the use of this elevated idle mode.
Constant speed engines and engines with an idle
speed at or above 1200 RPM will not require the
increase in idle speed.
i01646335
Engaging
the
Driven
Equipment
1.
Operate the engine at one-half of the rated rpm,
when possible.
2.
Engage the driven equipment without a load on the
equipment, when possible.
SEBU9063-07
73