Digital timing system

Details Digital timing system Digital timing system

1985-09-27

1987-01-20

Heyman, John S.

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

Systems

Comparing counts

123416, 123418, 377 49, 377 26, G06M 302, F02P 504

Patent

active

046384987

ABSTRACT:
A means to set spark timing in accordance with engine speed includes a counter to count clock pulses between engine speed reference pulses. A read-only memory has successive memory locations each storing an addend quantity and a repeats number. An adder unit, including an accumulator, operates to access the memory locations, and to add the addend quantities to the contents of the accumulator repeatedly a number of times equal to the respective repeats numbers. A comparator produces an ignition firing pulse when the contents of the accumulator corresponds with the reference period number provided by the counter.

REFERENCES:
patent: 3903857 (1975-09-01), Honig et al.
patent: 4009378 (1977-02-01), Sakamoto
patent: 4018197 (1977-04-01), Salway
patent: 4063539 (1977-12-01), Gorille et al.
patent: 4262644 (1981-04-01), Walker
patent: 4296471 (1981-10-01), Goux
patent: 4376428 (1983-03-01), Hata et al.

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