High energy adaptive ignition via digital control

Details High energy adaptive ignition via digital control High energy adaptive ignition via digital control

1975-11-20

1977-04-19

Bentley, Stephen C.

Internal-combustion engines

Igniters

Incandescent

123117R, F02P 304, F02P 504

Patent

active

040182029

ABSTRACT:
A digital system controls ignition dwell for an internal combustion engine. Dwell time is maintained constant, thus assuring a constant high level ignition spark, over the entire active RPM range of the engine. In addition, the system compensates for temperature and aging induced changes in the ignition components.
In operation, one sensor generates pulses representative of engine angular position while a second produces ignition pulses. An angle counter stores the number of position pulses generated thereby creating a count representative of engine position. A speed counter stores the number of position pulses generated for a clock interval, producing a count representative of engine speed. Dwell time is initiated at a predetermined relationship between the counter outputs which assures a constant dwell time. Feedback circuitry monitors current through the ignition coil and alters the clock interval to compensate for ignition component changes.

REFERENCES:
patent: 3908616 (1975-09-01), Sasayama
patent: 3937193 (1976-02-01), Kim

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