Spark timing control

Details Spark timing control Spark timing control

1988-07-19

1989-06-27

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123417, 377 20, 73 35, F02P 508, F02P 504

Patent

active

048419320

ABSTRACT:
A spark timing control for an electronic internal combustion engine ignition system that provides a constant spark advance regardless of engine speed. A series of crankshaft pulses are developed which occur at each 60 degrees of rotation of the crankshaft. The system has a source of constant frequency clock pulses which are counted up by an up-counter during 60 degree periods. The count attained by the up-counter during a 60 degree period is loaded into a down-counter. The up-counter is now counted up at a constant rate from zero and the down-counter is counted down at a constant rate from the count magnitude that was loaded into the down-counter. When the count magnitudes of the two counters are equal, a digital comparator that is connected to the counters develops an output signal that can be used to cause the firing of a spark plug.

REFERENCES:
patent: 3738339 (1973-06-01), Huntzinger et al.
patent: 4575865 (1986-03-01), Dackow
patent: 4638498 (1987-01-01), Siuniger et al.
patent: 4642772 (1987-02-01), Dackow
patent: 4646696 (1987-03-01), Dogadko
patent: 4726347 (1988-02-01), Sasaki et al.
patent: 4741310 (1988-05-01), Yagi et al.
patent: 4762106 (1988-08-01), Blaubut

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