[Judgement
of
oil
level]
When sufficient
oil
is in the crankcase, both of inner and outer electrodes are immersed
in
the oil through
which current
flows
across the electrodes. The sensor judges that oil in the crankcase is sufficient. When
oil level goes down and the inner electrode is exposed
to
the air due to consumption of oil, no current flow
between the electrodes as air is considered to be electrically nonconductive. The sensor in this case
judges that oil
is
insufficient.
4
[Decision
of
oil
shortage]
Oil level at the electrodes may
go
down momentarily probably due to the engine being slanted or affected
by vibration even if
a
sufficient oil is
in
the crankcase. For that reason, the sensor has an electronic timer
circuit
to
prevent
it
from interpreting as short of oil when amount
of
oil
is
sufficient. The sensor has been
designed
so
that the engine is to be stopped only when oil-shortage is detected for
5
seconds uninter-
rupted. The timer employs
an
integration circuit and
it
is to be reset when the inner electrode is soaked
in
the oil again before
the
sensor decides
it
as oil-shortage. The oil level where the sensor decides as oil-
shortage, when oil level goes down gradually, is called "threshold level".
[Automatic
stop
of
engine]
When the sensor decides as oil-shortage,
it
makes the engine to stop running automatically for protec-
tion
of
engine. Once the stopping circuit is activated,
it
keeps functioning until
it
confirms that the engine
has made a complete stop, then the circuit stops functioning automatically.
5-44
BLOCK
DIAGRAM
OF
THE CIRCUIT
Power circuit
Igniter
Inner
pole
-
-
circuit
circuit
Deley circuit
Detection Stopping
oil
I
Outer
pole
Engine ground
Fig.
5-
16
a
Power circuit
..........
This
rectifies
a
part
of
power to the igniter and regulates it to supply the stabi-
lized power to necessary circuits.
,1
-
20-
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