| 摘要 |
There is provided a digital electronic ignition timing control circuit for an internal combustion engine wherein a retard angle from the reference angular position of the engine which corresponds to the number of revolutions of the engine and the vacuum within the engine intake manifold is read out from a predetermined program, the retard angle thus read out is converted, in terms of a frequency which varies with a predetermined functional relationship, into a delay time from the moment at which the rotation of the engine passes the reference angular position, the frequency corresponding to the delay time is counted by a counter, and the expiration of the delay time from the moment of passing the reference angular position is computed in accordance with the count of the counter to determine the timing of the ignition. Thus, the system of this invention is free from deterioration with age, capable of timing the ignition of an engine with very high accuracy, capable of readily obtaining a different ignition timing characteristic by changing the program, is requiring no complicate computing circuitry, eliminates the computing time for an electronic ignition system through the use of a digital system and hence is superior in response characteristic.
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