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14 OPERATION
N° MA.IE.
144-00 :
Chciractristics
of the
«
L.jetronic » electronic
Jtiel
injc'C/iou
system.
COLD
START INJECTOR
When the engine
is
cold, fuel settles
on the
inlet distribution chamber,
and
on
the
cylinder
walls.
Therefore,
the
quantity of fuel
which
mixes with the inlet air is smaller than in an
engine
which
has reached normal
running
temperature.
The mixture thus obtained will not ignite.
The
cold-start
injector enriches
the
mixture in
each inlet duct by vaporizing fuel
in
the
inlet
manif
old.
However,
it only comes into operation when
the
starter motor is
actuated,
and
when
a thermal switch located in'the
engine
coolant.has
simultaneously closed
the
circuit,
A helicoidal
spring compresses the mobile core of
the electro-magnet
and its
seal fuel
cannot pass through.
When the magnetic
core is attracted, the
injector
seat is freed-off, the fuel
fiows
post the core, andreached the
spiral
effect
injector, which injects the fuel,
simultaneously giving
it a
spiral motion, and vaporizing it
very
finely.
THERMAL
SWITCH
The thermal
switch
cuts
out
the
operation of the
cold-start injector
when
the temperature
of
the engine reaches
±
35°
C,.
For
any
temperature below +
350
C,
the
thermal
switch limits the
duration
of injection.
The
maximum
durution
is
approximately
7.5 secs. at
-
20°
C. Duration of injection is
reduced
as temperature
increases
The
variation in
duration,
determined
by the thermal
switch,. is obtained
by means
of
a
bi-metallic strip
heated
by
an
electrical
resistance.
The bi-metallic
strip
cuts out the
circuit
according to the temperature reached
after
it has heated
for a certain amount
of time.
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