Internal-combustion engines – High tension ignition system – Safety device
Patent
1981-09-04
1984-03-27
Lall, Parshotam S.
Internal-combustion engines
High tension ignition system
Safety device
1231465B, 123198B, 123198D, 180287, 307 10AT, 340 64, B60R 2500
Patent
active
044387520
ABSTRACT:
A vehicle ignition system comprises a transformer having a primary winding and a secondary winding for providing the desired high voltage to the spark plug of the vehicle engine and a circuit including a further winding for said transformer connected across a switch and a load. The switch is operable only by a security device and when it is closed, the load absorbs energy from the transformer so that insufficient voltage is generated at the spark plug and the vehicle is immobilized. The load can be replaced by a reverse flux generator, the reverse flux opposing that generated by the primary winding. The security device may comprise a conventional key and keyhole, or more sophisticated devices such as code readers which read a code inputted from a magnetic card or from a keyboard. Further security may be provided by a further switch in series with the primary winding and battery, the further switch being operable in synchronism with and in the opposite sense to the first mentioned switch.
REFERENCES:
patent: 3675036 (1972-07-01), Davies
patent: 3828750 (1974-08-01), Schuette et al.
patent: 4141332 (1979-02-01), Wyler
patent: 4186710 (1980-02-01), Kilgore
patent: 4207850 (1980-06-01), Wharton
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