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The unit injector consists of a pumping element (A),
a controlling component (B), and a nozzle (C) as
shown in the illustration. The pumping element (A)
generates the fuel pressure as the force from the
cam drives the plunger via the rocker arm. The
controlling component (B) controls the operation of
the spill valve and needle control valve by driving
the solenoid according to the commands from ECU.
Finally the nozzle element (C) injects the
p r e s s u r i z e d f u e l i n t o t h e c y l i n d e r .
EUI SYSTEM
VGT SPEED
VGT SPEED
COOLANT
COOLANT
TEMPERATURE
TEMPERATURE
AIR HEATER
AIR HEATER
RELAY
RELAY
INSTALLATION & OPERATION MANUAL
H380 Series
CHAPTER 4
FUEL SYSTEM
VGT
VGT
AIR PRESS. &
AIR PRESS. &
TEMPERATURE
TEMPERATURE
FUEL
FUEL
TEMPERATURE
TEMPERATURE
ECU
ECU
ACCELERATION
ACCELERATION
LEVER
LEVER
- 26 -
EUI EXTERNAL
EUI EXTERNAL
CONNECTOR
CONNECTOR
CAM
CAM
POSI-
POSI-
TION
TION
CRANK
CRANK
POSITION
POSITION
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