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GEN
INFO
FEATURES
• Starting cylinder control
1
Injectors #1,4
2
Injectors #2,3
3
Starting asynchro-
nous injection
4
Group injection
È
Cylinder identification
sensor
É
Crankshaft position
sensor
Ê
Injection
Ë
Stop
Ì
Synchronous injection
• After-start enrichment
After-start enrichment provides enrichment compensation during a prescribed duration following the
starting (firing) of the engine. While the amount of fuel enrichment is determined by the after-start
enrichment coefficient, the coefficient varies by the coolant temperature. Although the coolant tem-
perature determines the initial starting enrichment coefficient, the coefficient subsequently changes
in accordance with the damping factor. The enrichment ratio is the highest immediately after the
engine is started, and diminishes gradually. The enrichment of fuel in this manner ensures a stable
engine operation immediately after the engine is started.
Changes in compensation coefficient and compensation injection duration
#1/4
After-start enrichment
Basic injection
duration
Duration
Long
Short
Injection
duration
Compensation injection
duration
Engine speed
Cranking
Starting enrichment coefficient
Changes in compensation coefficient
Stopped
Initial starting enrichment
coefficient
(determined by coolant
temperature)