2)
At the higher engine speed
Rotation
of
the flywheel generates the current
I,
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
coIlector current
16
and
will
bypass
the
current
I,
to shut down the current
Ir
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 control
circuit €or the lower speed and
not
activated when the engine speed is
in
a
lower range.
ELECTRONIC ADVANCING
FLYWHEEL
MAGNETO SYSTEM
(B.T.D.C.)
L
STEP
ADVANCING
15'1
,
,
,
,
500
1000
2000
3000(r.p.m.)
ENGINE REVOLUTION
Fig.
6-2
(b)
-
43
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