CONTROLLER

To solve a problem in which since flow of air-fuel mixture changes in a cylinder, reliable ignition has not been performed due to spark discharge.SOLUTION: An ignition control unit 24 comprises: a secondary voltage calculation unit 31 that calculates an average value of a secondary voltage generated on a secondary side of an ignition coil; an irregular flow ratio calculation unit 32 that calculates a ratio of a cycle in which the average value of the secondary voltage is less than or equal to a set average value, to a cycle of an internal combustion engine in a predetermined period, as an irregular flow ratio indicating that flow of air-fuel mixture in a cylinder is irregular; and an ignition control amount correction unit 37 that corrects an ignition control amount so that the irregular flow ratio is equal to or less than a set ratio value that is a target for reaching the irregular flow ratio.SELECTED DRAWING: Figure 3 【課題】気筒内の混合気の流れが変化することで、火花放電による確実な点火が行えないことがあった。【解決手段】点火制御部２４は、点火コイルの２次側に発生する２次電圧の平均値を算出する２次電圧算出部３１と、所定期間における内燃機関のサイクルに対する、２次電圧の平均値が設定平均値以下となるサイクルの比率を、気筒内における混合気の流れが不規則であることを表す不規則流れ比率として算出する不規則流れ比率算出部３２と、不規則流れ比率が、不規則流れ比率の到達目標とする設定比率値以下となるように点火操作量を補正する点火操作量補正部３７と、を備える。【選択図】図３