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(11) | EP 1 085 204 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Engine ignition system |
(57) In an engine ignition system utilizing an AC generator (1) for supplying an electric
power to an ignition coil (13), a phase relationship between the generator voltage
and an ignition timing (T1) is determined so that an electric current flowing through
a primary winding (L1) of the ignition coil (13) due to the voltage generation by
the AC generator (1) at the ignition timing (T1) is greater than a predetermined current
(Ad) required to produce a sufficient spark from a spark plug (14). Such an ignition
system can advantageously ensure achieving ignition even when the battery is disconnected
or totally discharged. Preferably, a capacitor (C1) is connected in parallel with
the primary winding (L1) of the ignition coil (13). A stator core (6) for supporting
a stator coil (5) in the AC generator (1) may be circumferentially displaceable to
adjust the phase relationship between the ignition timing and the generator voltage. |