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15-10
(2) Fuel injection control
a. Multi injection
Fuel injection process consists of 3 steps: Main Injection, Pilot Injection, Post Injection
Function
Injection
Reduces PM by injecting
Pilot 1
before main injection.
Pilot 2
Reduces NOx and noise by
shortening main injection delay
due to flammability
Pre
Controls NOx emission level,
Combustion noise and
Stable idle
▶
Pilot injection
Produces engine power
Main
PM control
After
Post 1
Reduces PM by enabling fuel
activation.
Post 2
Activates CDPF by increasing
exhaust gas temperature and
supplying reduction material
▶
Multi injection
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Troubleshooting
