| 摘要 |
An ignition timing control method of an internal combustion engine is provided to minimize variation of torques of cylinders by controlling ignition timing of each cylinder in accordance with the coefficient of variation of each cylinder. An ignition timing control method of an internal combustion engine includes a step(S110) of calculating the amount of air taken into an engine, a step(S120) of determining an abnormal engine torque value in accordance with the amount of air calculated in the previous step, a step(S130) of determining a gross indicated torque by correcting the abnormal engine torque value in accordance with an external engine load value, a step(S140) of calculating an indicated average effective pressure in accordance with the gross indicated torque, a step(S150) of calculating coefficients of variance for each cylinder in accordance with the indicated average effective pressure, and a step(S160) of determining ignition timing correction values for cylinders in accordance with the coefficients of variance.
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