Doosan DL06 - Electric Control Unit: ECU; Fuel Injection System

DL06K Interim Tire-4 Diesel Engine Technical Information
23
2.3.3. Electric control unit : ECU
z The ECU is used to supply fuel.
z The ECU is connected to various
types of sensors, and controls the
engine with the value set in these
sensors for optimal operation.
CAUTION:
Make sure to disconnect the
ground wire of the battery cable before removing the connector of the ECU.
Never disassemble the ECU.
2.3.4. Fuel injection system
z High pressure fuel processed by the high pressure fuel pump is saved in the
common rail, and spraying and fuel amount are calculated, based on the data
programmed in the ECU. At this time, the ECU activates the solenoid valve of the
injector, which is installed for each engine cylinder, to spray fuel into the cylinder.
2.3.5. Bleeding the fuel system
z To expel air from the fuel line, loosen the fuel supply pipe from the secondary fuel
filter to the fuel high pressure pump, and activate the priming pump manually of
the primary fuel filter until no bubble is found.
EK1OM012
Electronic Control Unit (ECU)
Primary fuel filter
Electronic Control Unit
(ECU)
Fuel tank
Common rail
Injector
Cylinder head
High pressure fuel pump
(CP 3.3 NH fuel pump)
EK1OM013
Secondary fuel filter