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[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.
[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.
5-4-4 BLOCK
DIAGRAM
OF
THE
CIRCUIT
Power circuit
igniter
Inner pole
-
Detection
-
circuit
circuit
'
Deley
circuit
Stopping
oil
1
+
-Pole
Engine ground
Fig.
5-18
0
Power
circuit
..........
This rectifies a part of power to the igniter and regulates it
to
supply the st&+
lized power
to
necessary circuits.
-
17-