1.1.
ROBIN
OIL
SENSOR
SYSTEM
(FLOAT
SYSTEM)
/-
In the
EYOS,
an oil sensor is available as a maker option.
11
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1
FEATURES
1) The engine oil sensor detects the quantity of engine oil and automatically stops the engine, if
it
falls
below the specified level, to prevent the engine from burning due to oil maintenance failure
or
for other
reasons.
If the
oil
shortage warning lamp is connected to the connecting terminal for it. the warning lamp is lit
when the engine stops.
2)
If the engine oilis short when the engine is started, the engine can not be started, even
if
the recoil starter
is pulled. If the warning lamp is connected, the lamp is lit to indicate oil shortage.
3)
As
the power generated by the igniter
is
used, any special power supply unit is not necessary.
4)
On-tatch stop is possible also by using the stop button, which is generally incorporated in the unit, based
on a push button system. (Self-maintaining and automatic restoration circuits are incorporated in the
unit.)
5)
This system features the malfunction preventing structure depending on outer magnetic field.
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-2
BASIC
PRINCIPLE
This oil sensor system consists of a flywheeI magneto, an igniter, an oil level controller, and an oil level
sensor.
As
shown in Fig.
43,
when the oil level is above the specified one, the lead switch contact
is
OFF,
and the
engine can run normally (sensor OFF condition). If the oil becomes short and position
of
the float in the
/"
sensor case goes down to the specified level shown in Fig.
44,
the lead switch contact
is
turned
ON
by the
magnetic field of the permanent magnet incorporated in the float (sensor
ON
condition).
When the oil level sensor is turned
ON,
the current
il
generated by the counter-electromotive voltage
VI
in
the primary ignition coil flows from the primary wire of the igniter via the delaying circuit of the oil level
controller, both
of
which are shown in the block diagram. When the current
iI
generated by the counter
electromotive voltage
VI
goes
up
to a certain level, the current
il
is loaded to the SCR gate from the delay-
ing circuit via the self-maintaining circuit if
V,
is loaded.
Then, the SCR is turned
ON,
thus starting operation of the warning lamp driving circuit, lgighting the warn-
ing lamp to indicate the oil shortage condition, and completely short-circuiting the regular electromotive
voltage
V,
in the primary coil
of
the igniter
for
the igniter not to generate sparks.
This
condition is con-
tinued until the engine is stopped
by
the self-maintaining circuit.
In normal stopping operation
of
the engine, the current
i,
generated by the regular electromotive voltage
V,
in the primary coil
of
the igniter is loaded, via the stop switch, to the self-maintaining circuit of the oil
level controller.
This
current is loaded to the
SCR
gate via the self maintaining curcuit, and the
SCR
is turned
ON.
When the SCR is turned
ON,
the driving circuit of the warning lamp starts operating, thus lighting the
warning lamp, and completely short-circuiting the regular electromotive voltage
V,
in the primary coil of the
igniter for the igniter not to generate sparks.
This condition is continued until the engine is stopped by the self-maintaining circuit.
In restarting, the engine stopping operation
is
cancelled by automatically restoring mechanism, and the en-
gine can be started normally.
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30
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