Supplement to Manual 818.1 ADD
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OPERATION
N° MA.IE.
144-00
:
Characterjstics
of
the «
L.Jetrooie
eIeCtrOo/1C Op. MA.IE
144-00
13
fuel injection systern.
INJECTORS (1):
Each
cylinder is supplied
by
an electro-magnetically
controlled
injector which is fitted in
the
inlet duct;
the
injéctor
vaporises
the fuel upstream
of the inlet valve.
In the case
of the
«
L-Jetronic
»
system all the
injectors
operate simultaneously. However, in order to ensure regular fuel supply to
the cyliriders, there
are
two injections for each rotation
of
the camshaft, each
one
supplying
half the metered quantity
of
fuel
required
for
the
complete engine cycie.
The
injector consists of
a valve
housing
and an injector needle
fitted with
a magnetic core. The mobile magnetic
core is in one piece with
the
needle which
in
tum
is compressed
against the air-tight
injector housing
seat
by
a
helicoidal
spring. At the rear
end
of the injector, there is a solenoid. and
at
the front a
guide
for
the
injector
needle.
Impulses
coming from the E.C.U. create a magnetic field in the
solenoid; the magnetic core is
attracted, and
the
needle lifts off
its
seat the fuel under pressure
is
free to pass through. The
movement af the magnetic care is
approximately
0.15 mm.
The duration
of opening is
determined
by the EC.U.
as a function
of the operating
conditions
of the engine at the
moment in question.
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0.
TEMPERATURE
SENSORS
When the
engine
is started,
for
a
temperature of approximately
-
20°
C,
it
needs
twa to three times
more fuel than
when
it has reached
normal operating temperature.
The
enrichment of the
mixture must
be
reduced as the
engine
warms
up and
must
cease
as
oon
as
the engine has reached normal operating temperature.
In order
to start off
this regulating
procedure,
the
engine temperature must be
communicated to
the
E.C,U.
(
Electronic Control
Unit
).
This is the
object of the temperature sens
ors.
The temperature sensor consists
of a
hollow
threaded rod
in which is
located
an NTC Thermistor made
in
semi-
conducting
material. The
letters .NTC,
which signify
«negative
temperature
coefficient
»
characterise
its
specific
property :
its
electrical
resistance
decreases
as
the
temperature increases.
The «L-Jetronic
»
system
is fitted witha water
temperature
sensor (2) and an air temperature sensor, the latter
situated in
the
air-flow sensor.
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