Robin America RGX3510 Service Manual page 37

[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.
\ % ' h e n 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 non-conductive.
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 i s
LO
be stopped only
when oil-shortage is detected for 5 seconds uninterrupted.
The timer emplovs 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 rhe sensor decides as oil-shortage, it makes the engine to stop running automatically for protection
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.
5-5-4
BLOCK DIAGRAM OF THE CIRCUIT
Power circuit
Igniter
-
-
LED indicator
Inner pole
- 1
Detection
-
Deley circuit
Stopping
circuit
circuit
o i l
I
Outer pole
Fig. 5-
15
:
1:
Po\\:er circuit
-.
*
/"
u
This rectifies a part of power to the igniter and regulates it to supply the
stabilized power to necessary circuits.
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34 -