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A method of and apparatus for controlling ignition timing of an internal-combustion engine in accordance with the degree of knocking, the apparatus comprising a knock detector for detecting a vibration corresponding to knocking of the internal-combustion engine, a knock detector circuit responsive t

A method of and apparatus for controlling ignition timing of an internal-combustion engine in accordance with the degree of knocking, the apparatus comprising a knock detector for detecting a vibration corresponding to knocking of the internal-combustion engine, a knock detector circuit responsive to output from the knock detector for detecting the knocking of the internal-combustion engine, and corrective advance computing circuit responsive to an output signal from the knock detector circuit for controlling ignition timing of the engine, wherein the corrective advance computing circuit counts the number of knocks detected during a period of predetermined combustion cycles, compares the number of knocks with a predetermined number, and controls ignition to advance or delay it in accordance with the result of comparison.

대표청구항 ▼

A method of controlling ignition timing in an ignition control apparatus for an internal combustion engine having a knock detector for detecting a vibration factor corresponding to knocking of said internal combustion engine; a knock detector circuit responsive to an output from said knock detector

A method of controlling ignition timing in an ignition control apparatus for an internal combustion engine having a knock detector for detecting a vibration factor corresponding to knocking of said internal combustion engine; a knock detector circuit responsive to an output from said knock detector for detecting knocking of said internal combustion engine; and a corrective advance computing circuit responsive to an output from said knock detector circuit for controllably influencing ignition timing in accordance with an indicated one of a plurality of functions, said functions including advancing, maintaining, and delaying ignition timing, said method comprising the steps of: detecting a knock rate as a function of sampling engine knock during engine combustion cycles in said corrective advance computing circuit, said corrective advance computing circuit counting up to a predetermined number of combustion cycles and counting detected knocks during the counting of said combustion cycles; advancing ignition timing by a predetermined angle at the end of a predetermined number of samples when said knock rate is less than a predetermined low rate, said ignition timing being advanced when the number of detected knocks is smaller than the smaller of two predetermined numbers at the completion of counting of said predetermined number of combustion cycles; maintaining ignition timing at the end of said predetermined number of samples when said knock rate is within a predetermined range, said ignition timing being maintained when the number of detected knocks is between the smaller and larger of said two predetermined numbers at the completion of counting of said predetermined number of combustion cycles; delaying ignition timing by a predetermined angle when said knock rate is greater than a predetermined high rate, said ignition timing being delayed when the number of detected knocks exceeds the larger of said two predetermined numbers at any time prior to and including the completion of counting of said predetermined number of combustion cycles; and resetting the counting of combustion cycles and detected knocks for restart at the earlier of two conditions, said conditions being the number of combustion cycles equalling said predetermined number of combustion cycles and the number of detected knocks exceeding the larger of said two predetermined numbers.