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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 c
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
by vibration even if a sufficient oil is in the crankcase. For that reason, the sensor has an electronic time
circuit to prevent it from interpreting as short
o f 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
+
- P o l e
Engine
Fig. 5-18
0
Power
circuit
..........
This rectifies a part of power to the igniter and regulates
it to supply the s t & +
lized power to necessary circuits.
-
17-
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