Digital circuitry for producing indicative signals at predetermi

Details Digital circuitry for producing indicative signals at predetermi Digital circuitry for producing indicative signals at predetermi

1981-11-02

1985-08-13

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Comparing counts

G06M 302

Patent

active

045354642

ABSTRACT:
Digital circuitry adaptable for controlling dwell in a spark and dwell ignition control system is disclosed. Maximum advance and reference sensors are utilized to produce pulse transitions which determine positions of maximum and minimum possible advance for spark ignition with respect to the position of the engine crankshaft. For each maximum advance sensor pulse transition a main counter starts a sequential running count of speed independent clock pulses wherein the maximum count obtained by the counter is related to engine crankshaft speed. The running and maximum counts of the main counter are utilized by dwell circuitry to determine the time prior to the next maximum advance pulse at which spark coil excitation should occur.

REFERENCES:
patent: 4008698 (1977-02-01), Gartner

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