MULTIPLE FUEL INJECTION CONTROL OPERATION [MZR-CD (RF Turbo)]
BME014000140T46
• The multiple fuel injection control has five injection patterns with varying injection frequencies. The PCM selects the optimum injection pattern according to vehicle conditions and performs injection a maximum of five times.
• The main injection is injected in order to secure engine performance.
• The pre-injection is injected in order to improve emission performance.
• The pilot injection is injected in order to reduce noise.
• The follow-up injection is injected in order to improve emission performance.
.
|
1
|
Crank angle standard position
|
|
2
|
TDC
|
|
3
|
CKP sensor signal
|
|
4
|
Injection pattern for five injections
|
|
5
|
Injection pattern for four injections
|
|
6
|
Injection pattern for three injections
|
|
7
|
Injection pattern for two injections
|
|
8
|
Injection pattern for one injection
|
|
9
|
Pilot injection
|
|
10
|
Pre-injection
|
|
11
|
Main injection
|
|
12
|
Follow-up injection
|
Operating Condition
• The PCM determines the injection frequency based on the engine speed, fuel injection amount, and signals from each sensor.
• When the engine is started, the PCM calculates the injection frequency based on the engine coolant temperature and engine speed.