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(4) Fuel injection timing control
(4.1) Main injection timing
• The main injection timing is calculated from the fuel injection
quantity and engine speed.
(4.2) Pilot injection timing (pilot interval)
• The pilot injection timing is calculated from the fuel injection
quantity and engine speed.
(5) Fuel injection pressure control
• The fuel injection pressure is calculated from the fuel injection
quantity and engine speed.
(6) Warm-up acceleration function
• The warm-up acceleration function increases engine warm-up by varying the engine’s idling speed in accordance
with the engine’s coolant temperature. It can operate either automatically or manually. Selection is made using the
idling speed adjustment potentiometer.
Water temperature sensor
Accelerator pedal position
sensor
Idling speed adjustment
potentiometer
Input signals
Engine electronic
control unit
Output signals
Comparison
operations
Target injection
quantity
Idling speed
control
STRUCTURE AND OPERATION
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