3–3
T-378
3.3 Fuel Injector (Doser) Description
3.3.1
Fuel Injector (Doser)
The Fuel Injector (Doser),
, sprays a small amount of fuel into the exhaust. The Doser helps raise
exhaust temperatures during active regeneration when the engine is too lightly loaded for passive regeneration to
occur. During active regeneration, the Doser valve injects a fine mist of fuel into the exhaust stream, where it then
ignites on the surface of the DOC to raise the exhaust temperature and oxidize the particulate matter in the DPF.
Automatic regeneration is initiated by the Emissions Control Module (ECM). Refer to
for a description
of how regeneration works.
Coolant from the generator set radiator is supplied to the Doser to remove heat.
Figure 3.4 Doser
3.3.2
EES Fuel Pump and Filter
The EES Fuel Pump,
, taps into the generator set fuel tank supply in to pump fuel directly to the Doser
during DPF regeneration. An in-line fuel filter / water separator is located between the pump and Doser.
Figure 3.5 EES Fuel Pump
