Spark timing control system

Details Spark timing control system Spark timing control system

1991-03-27

1994-03-01

Trans, Vincent N.

Boots, shoes, and leggings

123414, 123417, 123419, F02P 515

Patent

active

052914097

ABSTRACT:
A digital spark timing control for an ignition system of a spark ignited internal combustion engine. Engine crankshaft position sensor, develops by way of example, three reference pulses and eighteen position pulses for each complete revolution of the crankshaft. The reference pulses are angularly spaced by 120.degree. and the position pulses by 20.degree.. A spark taming value is computed by a computer and its program is interrupted at the occurrence of a reference or position pulse. The system at the occurrence of each interrupt determines whether or not the spark is to occur in the next twenty degree period. If the spark should occcur in the next twenty degree period, the system utilizes the most recent twenty degree time period to determine how long it will take the engine crankshaft to rotate from its current position to the desired spark position. This compensates for spark timing errors that might otherwise occur due to changes in engine speed.

REFERENCES:
patent: 4231091 (1980-10-01), Motz
patent: 4649881 (1987-03-01), Long
patent: 4723520 (1988-02-01), Suzuki et al.
patent: 4747383 (1988-05-01), Kimura et al.
patent: 4893244 (1990-01-01), Tang et al.
patent: 5019988 (1991-05-01), Glehr
patent: 5086741 (1992-02-01), Nakamura et al.

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