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(2)
At
lower engine revolution, when the flywheel reached the ignition point the low speed ignition timing
control circuit operates to run the base current
I3
to turn the signal transistor
A
“ON”
allowing the
current
11
to bypass as current
14.
At this moment the power transistor turns
“OFF”
and the current
h
is abruptly shut resulting in the
high voltage generated in the secondary coil which produces sparks at the spark plug.
(3)
At higher engine revoluti.on, the advancing control circuit operates at the ignition timing to run the
base current
I5
to turn the signal transistor
E3
“ON”
allowing the current
11
to bypass as current
Is.
At this moment the power transistor turns
“OFF”
and the current
h
is abruptly shut resulting in the
high voltage generated in the secondary coil which produces sparks at the spark plug.
The operating timing
of
the advancing control circuit advances in accordance with the increase
of
engine speed resulting in the advancing
of
ignition timing
as
shown in Fig. 6-l(b).
Fig.
6-7
(a)
ELECTRONIC ADVANCING
FLYWHEEL
(B.T.D.c.)
MAGNETO
SYSTEM
f
STEP
ADVANCING
I
I
I
I
500
1000
2000
3000
(r.p.m.)
ENGINE REVOLUTION
,“-
Fig.
6-1
(b)
-
44-