Method of suppressing ringing in an ignition circuit

Details Method of suppressing ringing in an ignition circuit Method of suppressing ringing in an ignition circuit

1993-12-16

1995-02-28

Nelli, Raymond A.

Internal-combustion engines

High tension ignition system

Having dwell control

F02P 900

Patent

active

053927540

ABSTRACT:
An inductive ignition circuit, comprising a secondary winding across a spark plug and a primary winding in series with a lossy transistor switch and a power source, is subject to ringing at the start of the dwell period which can cause premature combustion. Ringing is suppressed by a short switch turn on pulse followed by a short delay prior to the main dwell period, causing a beginning build up of primary current and circuit energy followed by absorption of energy in the switch during switching to dissipate circuit energy needed for oscillation. Preferably, the short pulse is terminated when all the ringing energy is stored in the leakage inductance of the ignition coil.

REFERENCES:
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patent: 4913123 (1990-04-01), De Beiasi et al.
patent: 4915086 (1990-04-01), Ciliberto et al.
patent: 4933861 (1990-06-01), Allen et al.
patent: 4972818 (1990-11-01), Nomura et al.
patent: 4977883 (1990-12-01), Koiwa
patent: 5007397 (1991-04-01), Akasu
patent: 5043900 (1991-08-01), Allen et al.

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