Installation and adjustament manual
7/36
DESCRIPTION
Fig.3.2
3.3 Distributor
The Distributor (Fig 3.3) is designed in order to maintain
at the inlet a constant pressure slightly higher than the
atmospheric one, and at the outlet a pressure close to the
one of the intake manifold.
It has the task of supplies the proper quantity of gas to
each cylinder.
Legenda
A) Gas inlet
B) Gas outlet
C) Alternative gas inlet
3.4 Injector
One injector is positioned on each duct of the air
intake manifold. It injects the gas through an
orifice that is calibrated according to the engine
displacement (Fig 3.4).
3.5 Electronic Control Unit (ECU)
The strategy of the electronic handling is memorised in a
step-motors opening map which is defined depending on
the engine RPM and on the MAP mesured in the air intake
manifold in reference conditions.
These data are fine-tuned by means of the proportional-
integral correction in function of the Lambda sensor signal,
and further fine-tuned in function of the TPS signal, for
acceleration and cut-off conditions.
Fig.3.3
Fig.3.4
The MAP sensor is an integral part of the LIS, as is the
temperature sensor on the regulator-vaporizer.
The signal of the temperature sensor is utilized to establish
the petrol-gas automatic change-over after the engine start-
up. The change-over is also a function of other parameters
like the time elapsed from start-up, status of the oxygen
sensor, RPM.
The LIS includes strategies that prevent over-revving, and
there is an automatic switching to petrol in case of
extensive malfunction (Fig 3.5).
Legenda:
A) Electronic Control Unit ( ECU)
B) MAP signal inlet
C) Electric cable connector
D) Bracket mounting points
Main data
Operational voltage ........................ 12V (-20%/+30%)
Maximum current absorption during operation ... 0.6A
Maximum current applicable to the relay for cutting the
petrol injection (yellow wires) ............................. 6.5A
Maximum output current available for gas control devices
(Blue Wires) ......................................................... 6.5A
Protection against dust and water ......................... IP54
Fig.3.5
