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2)
At the higher engine speed
Rotation
of
the flywheel generates the current
I1
as this current
flows
through the base terminal
of
the
power transistor,
it
is activated and the current
IZ
starts
of
flow.
As
the engine reaches the ignition timing, the ignition timing control circuit
for
the higher engine
speed
is
activated and provides the base current
Is
to
the power transistor. This current induces the
collector current
It,
and will bypass the current
I,
to shut down the current
IZ
abruptly because the
power transistor is turned
off.
This sudden current change generates a big voltage
on
the secondary side
of
the ignition coil and
which
will
spark the spark plug.
The ignition timing control circuit for the higher engine speed is activated sooner than the controI
circuit for the lower speed and not activated when the engine speed
is
in a lower range.
7
cn
3
h
ELECTRONIC ADVANCING
FLYWHEEL
MAGNETO
SYSTEM
(B.T.D.C.)
15”k
I
,
,
500
1000
2000
3000(r.p.m.)
ENGINE
REVOLUTION
Fig.
6-2
(b)
-
44
-