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2-7 [M6031
FUEL INJECTION SYSTEM
3. FUEL INJECTION CONTROL
ECU receives signals emitted from various sensors to
control the amount of fuel injected and the fuel injection
timing . Sequential fuel injection control is utilized over
the entire engine operating range except during stand-
ing starts .
As for injection timing, the ECU controls the starting of
injection with leading to the signal emitted from crank
angle sensor 1 .
The starting of injection is changed between BTDC 50°
(deg) and BTDC 10° (deg) under various conditions .
STDC
100°
40°
#6 I
700
1
100
--
I
#3
#2
#5
04
30° ~
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~
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~
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~
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~ I
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i
sensor 1
~
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,
i
Crank angle
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'
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I
I
I
I
sensor 2
I
I
1
I
t
I
I
am angle
I
I
I
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,
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sensor
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I
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I #5
Air intake timing
Intake valve
I
Open
timing
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Fuel
1
1 #5
injection
Ti
C2-175
Fig . 21
The amount of fuel injected by the injector valve is
dependent upon the length of time it remains open . The
optimum fuel injection timing is determined by trans-
mitting a signal to the injector from the ECU according
to varying engine operations . Feedback control is also
accomplished by means of a learning control . As a
result, the fuel injection control system is highly respon-
sive and accurate in design and structure .
The sequential fuel injection system is designed so that
fuel is injected at a specific time to provide maximum air
intake efficiency for each cylinder . In other words, fuel
injection is completed just before the intake valve be-
gins to open .
14
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