Contactless ignition apparatus for internal combustion engine

Details Contactless ignition apparatus for internal combustion engine Contactless ignition apparatus for internal combustion engine

1990-09-17

1991-10-22

Argenbright, Tony M.

Internal-combustion engines

High tension ignition system

Radio interference protection

123644, 123652, F02P 304

Patent

active

050585606

ABSTRACT:
A contactless ignition apparatus for an internal combustion engine comprises a resin-molded closed magnetic circuit type ignition coil including an iron core constituting a closed magnetic circuit, a primary winding and a secondary winding wound around the iron core, respectively, and mold resin for insulating the primary and secondary winding, a semiconductor switching circuit for interrupting a current flowing to the primary winding, and an ignition plug to which a high voltage generated in the secondary winding upon interruption of the primary current flow to the primary winding by the semiconductor switch circuit. The falling rate dI/dt of the primary current upon interruption thereof by the semiconductor switching circuit is set at a value in a range of 0.2 to 0.4 A/.mu.s. Noise radiation from the ignition coil can be reduced significantly.

REFERENCES:
patent: 2966615 (1960-12-01), Meyer et al.
patent: 4044733 (1977-08-01), Suda
patent: 4112903 (1978-09-01), Sugiura et al.
patent: 4128091 (1978-12-01), Balan et al.
patent: 4185603 (1980-01-01), Sohner et al.
patent: 4290406 (1981-09-01), Iyoda et al.
patent: 4368717 (1983-01-01), Roberts et al.
patent: 4653460 (1987-03-01), Ooyabu et al.

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