Pilot Injection - SSANGYONG Rodius 2012.07 Manual

b. Pilot Injection
Injection before main injection. Consists of 1st and 2nd pilot injection, and Pre-injection
Inject a small amount of fuel before main injection to make the combustion smooth. Also, called as
preliminary injection or ignition injection. This helps to reduce Nox, engine noise and vibration, and to
stabilize the idling.
The injected fuel volume is changed and stopped according to the coolant temperature and intake air
volume.
Stop conditions
- Pilot injection is much earlier than main injection due to higher engine rpm
- Too small injection volume (insufficient injection pressure, insufficient fuel injection volume in main
injection, engine braking)
- System failure (fuel system, engine control system)
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Combustion pressure characteristic curve for pilot injection
1.

Pilot injection

2. Main injection
1a. Combustion pressure with pilot injection
2b. Combustion pressure without pilot injection
15-13
0000-00