Fuel Injection Control - Mitsubishi 6M70 Workshop Manual

(2) Fuel injection control

(2.1) Pilot injection
• Pilot injection entails the injection of an extremely small amount
of fuel ahead of the main injection.
• This suppresses hasty heat generation early in the injection cy-
cle and thus suppresses NOx generation and noise at the start
of combustion.
• The post injection added after the main injection reduces partic-
ulate matter (PM) generation in the exhaust gas.
(3) Fuel injection quantity control
(3.1) Fuel injection quantity during engine startup
• During engine startup, the fuel injection quantity is determined in
accordance with the engine speed and coolant temperature.
(3.2) Basic fuel injection quantity
• The basic fuel injection quantity is determined in accordance
with the engine speed and throttle opening.
(3.3) Maximum injection quantity
• The maximum injection quantity is calculated from the engine
speed and boost pressure.
(3.4) Fuel injection rate adjustment resistor correction
amount
• To limit inconsistency in the injection quantity, the injection quan-
tity is corrected by the fuel injection rate adjustment resistor.
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