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INJECTION TIME COMPENSATION (VOLUME)
The various sensors allow the injection time (volume) compensations to be carried out on the basis of the follow-
ing signals.
ATMOSPHERIC PRESSURE SENSOR SIGNAL
D
ENGINE COOLANT TEMPERATURE SENSOR SIG-
NAL
AIR INTAKE TEMPERATURE SENSOR SIGNAL
BATTERY VOLTAGE SIGNAL
STARTER SIGNAL
ACCELERATION/DECELERATION SIGNAL
INJECTION ARREST CONTROL
R.P.M. LIMITER SIGNAL
ENGINE CUT-OFF SIGNAL
Air intake injection system
SIGNAL
SIGNAL
DESCRIPTION
When the atmospheric pressure is low, the sensor
sends a signal to the ECU to reduce the injection
time (volume).
In the starting phase the same sensor is used to
adjust the timing between the injection and the spark
in the 3 cylinder banks.
When the temperature of the engine coolant is low,
the injection time (volume) is increased.
When the temperature of the intake air is low, the
injection time (volume) is increased.
The voltage of the battery is supplied to the ECU for
the functioning of the ECU and this voltage is
revealed and utilised as a signal for the compensa-
tion of the injection time (volume). A low voltage
determines a longer injection time for the adjustment
of the volume of the injection.
When the engine is switched on, a greater volume of
fuel is injected during the starting period.
During acceleration, the injection time of the fuel
(volume) is increased in proportion to the opening of
the accelerator and the r.p.m. of the engine. During
deceleration, the injection of fuel is diminished in
proportion to the speed of closure of the accelerator
handgrip and of the engine r.p.m.
DESCRIPTION
The functioning of the fuel injectors is interrupted
when the level of engine r.p.m. reaches its limit. The
r.p.m. limiter interrupts the ignition system and the
interruption signal of the ignition is therefore sent to
the ECU.
The ECU stops fuel injector operation in the decelera-
tion phase when the gas potentiometer reaches zero
and the torque value falls below a given threshold. The
injectors turn back on again when a given engine rpm
threshold is reached.
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