Selective threshold ignition circuit

Details Selective threshold ignition circuit Selective threshold ignition circuit

1976-01-12

1977-10-04

Feinberg, Samuel

Internal-combustion engines

Igniters

Incandescent

361253, 315209T, 307327, F02P 100

Patent

active

040518272

ABSTRACT:
A selective threshold ignition circuit adaptable for use in an electronic ignition system for an engine is disclosed. A magnetic pick-up produces an AC signal about a DC reference level which has a frequency related to the rotational movement produced by the engine. A circuit receives this AC signal and produces a corresponding spark timing signal by comparing the AC signal with a DC threshold level. A selector circuit chooses a first DC threshold level for the comparing circuit which is effectively equal to the DC reference level during the period of engine start up. The selector circuit chooses a second DC threshold level which is different from the DC reference level when the engine is running and before the engine has been started. By providing a threshold level equal to the DC reference level during the engine start up mode of operation, an accurate ignition timing signal is produced during this critical period. By providing a different threshold level during the other modes of engine operation, increased noise immunity is obtained during these other modes of operation which results in lessening the chance of noise transients causing a timing pulse which may result in an unwanted ignition spark.

REFERENCES:
patent: 3299876 (1967-01-01), Mieras
patent: 3861370 (1975-01-01), Howard
patent: 3933141 (1976-01-01), Gunderson

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