10.
ROBIN
SOLID
STATE IGNITION ENGINE'
(U.T.C.I.)
b
10-1
FEATURES
EY08 emploies a pointless ignition system, called Solid State Ignition, which is the circuit breaker type igni-
tion device, utilizing the power transistor as an element for controling electric current.
This
ignition system is
called U.T.C.I. (Universal Type Transistor Controlled Ignition), and it is based on an external coil system
in which an ignition coil is installed outside the flywheel and the unit is mounted on an
iron
core of the coil.
Being different from the breaker point type ignition system, this brand-new system is completely free from
such troubles as starting-up failure owing to dirty, burnt or oxidized point surface, lowering
of
ignition effi-
ciency being caused by moisture, rough surface to breaker point and incorrect timing resultant from worn
mechanical parts.
10-2
BASIC PRINCIPLE
OF
U.T.C.!.
(See
Fig.
42.)
Electricity is generated
in
the primary ignition coil by rotation of the flywheel, and the current
a
flows,
by which the condenser is charged.
When the flywheel goes round further, direction
of
the current changes, and the current
b
flows, causing
the current
c
and the current
d
flow to the power transistor and the transistor for signals for each. The
condenser8is charged by the current
d
contrarily to the case
1).
When the flywheel goes round further more, the current generated in the primary coil gets to its peak,
and then begins decreasing.
Then, voltage between
C
(Collector) and
E
(Emitter) of the transistor for signals becomes zero, and the
transistor is turned
OFF,
while the current
d
changes to the current
e
and goes into the gate of the
thyrister
(SCR),
thus turning the
SCR
ON.
When the SCR is switched
ON
and the current
b
flows into the
SCR
(Current
f),
the current
c
flowing
the power transistor is interrupted abraptly, generating high voltage by the current change in the second-
ary coil, thus giving sparks to the spark plug.
ignition
Coil
Fig.
42
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29
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