High energy adaptive ignition via digital control

F - Mech Eng,Light,Heat,Weapons – 02 – P

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F02P 3/02 (2006.01) F02P 3/04 (2006.01) F02P 3/045 (2006.01) F02P 3/08 (2006.01)

Patent

CA 1079794

HIGH ENERGY ADAPTIVE IGNITION VIA DIGITAL CONTROL Abstract A digital system controls ignition dwell for an inter- nal 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 representive 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 initia- ted 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 com- ponent changes.

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