Spark timing control circuit for controlling the timing of spark

Details Spark timing control circuit for controlling the timing of spark Spark timing control circuit for controlling the timing of spark

1979-08-03

1981-04-21

Myhre, Charles J.

Internal-combustion engines

Charge forming device

Fuel injection system

123416, F02P 506

Patent

active

042626447

ABSTRACT:
A spark timing control circuit for an internal combustion engine, includes a speed band selector circuit which responds to an electrical signal indicative of engine speed and provides an output signal indicative of which of a plurality of speed bands is occupied by the engine speed. Spark timing information for each speed band is stored in a memory as a first word in units of angular rotation of the engine for the heaviest engine operating load, and a second and third words indicative of the slope of straight line approximations to the curve of engine load plotted against advance in said angle units. A build up circuit responds to an electrical signal indicative of the engine operating load and computes from the second and third words a build up word which is added to the first word in an accumulator so as to derive an accumulated word in said angle units indicative of the desired spark timing. A residue angle counter, clocked by angle clock pulses from a clock converts the accumulated word into a corresponding time delay which is used to control the timing of the occurrence of spark ignition.

REFERENCES:
patent: 3752139 (1973-08-01), Aeplund
patent: 3898894 (1975-08-01), Aono et al.
patent: 3904856 (1975-09-01), Monpetit
patent: 3923021 (1975-12-01), Stark
patent: 3941103 (1976-03-01), Hartig
patent: 4009699 (1977-03-01), Hetzler et al.
patent: 4020807 (1977-05-01), Del Zotto et al.
patent: 4104997 (1978-08-01), Padgitt

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