Yamaha F150B, Руководство по обслуживанию

Страница: 51 / 458

2-8
Electronic control system
0
1
2
3
4
5
6
7
8
9
10
A
Fuel injection control
Simultaneous injection of group cylinders upon starting
A
Compression TDC
Synchronous
injection Simultaneous
injection for a
group of
cylinders at
engine start-
up The fuel injection timing control applicable to the start-up mode
after the cylinder identification is completed by the pulser coil.
Fuel injectors are turned on simultaneously for each cylinder
group (#1 and 4, #2 and 3), synchronized at the crankshaft
angle signal reference point (BTDC 370° CA) or at BTDC 70°
CA in reference to the exhaust TDC.
Group
injection in
normal
operation Fuel injectors are turned on in reference to the exhaust (com-
pression) TDC when only the cylinder group identification is
completed and the engine is not in the start-up mode. The fuel
injectors for a group of cylinders are turned on simultaneously.
Fuel is injected two times in every two rotations of crankshaft.
Asynchro-
nous injec-
tion Asynchronous
injection at
acceleration When the increment of throttle opening gets larger than the set
value in the course of acceleration, for instance, the fuel is
injected immediately and simultaneously at all cylinders, rather
than synchronizing with the engine rotation signal transmitted
by the pulser coil. This prevents the lean air/fuel ratio, and
assures the sharp throttle response in acceleration.
A
Cylinder 1
Cylinder 3
Cylinder 4
Cylinder 2
Pulser coil signal 1
Pulser coil signal 2
Injection #1 and #4
Injection #2 and #3
Compression Combustion Exhaust Intake Compression
Compression Combustion Exhaust Intake Intake
Compression Combustion Exhaust Intake Exhaust
Combustion Exhaust Intake Compression Combustion
BTDC70° BTDC10°
#1 and #4
BTDC70° BTDC10°
#1 and #4
BTDC70° BTDC10°
#1 and #4
BTDC70° BTDC10°
#2 and #3
BTDC70° BTDC10°
#2 and #3