Internal-combustion engines – Igniters – Sparkers
Patent
1981-05-20
1982-05-18
Lall, P. S.
Internal-combustion engines
Igniters
Sparkers
123599, 123149D, 123605, 315209T, F02P 306, H05B 3702
Patent
active
043299504
ABSTRACT:
On-off oscillations immediately following the initiation of the spark in a magneto ignition system are prevented by a timing circuit the capacitor of which is charged continually even during the spark time and whose discharge time constant exceeds 10 .mu.s. The capacitor is discharged through the emitter-base circuit of a control transistor and keeps the control transistor in a saturated state throughout the desired spark duration. While the control transistor is in the saturated state, it shortcircuits the emitter-base circuit of the ignition transistor, thereby blocking the ignition transistor continuously. Since the capacitor of the timing circuit is continually charged, the actual spark duration greatly exceeds the 10 .mu.s time constant of the timing circuit and may be as high as 1.2 ms.
REFERENCES:
patent: 3508116 (1970-04-01), Burson
patent: 3605713 (1971-09-01), Masters et al.
patent: 3938491 (1976-02-01), Mazza
patent: 4117820 (1978-10-01), Kashiwazaki et al.
patent: 4174697 (1979-11-01), Podrapsky et al.
patent: 4175509 (1979-11-01), Orova et al.
patent: 4178892 (1979-12-01), Podrapsky et al.
patent: 4188929 (1980-02-01), Podrapsky et al.
Orova Josef
Podrapsky Jiri
Lall P. S.
Robert & Bosch GmbH
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