ENGINE SYSTEM

To suppress combustion fluctuation by estimating a flow condition in a cylinder and performing fuel injection according to the flow condition.SOLUTION: An engine system comprises an auxiliary fuel injection unit 84 which when an estimated flow speed estimated on the basis of a parameter in a discharge path formed by inspection ignition is lower than a first set value Vp1 or higher than a second set value Vp2 higher than the first set value Vp1, controls an injector 6 so that injector 6 performs auxiliary fuel injection as subsidiary fuel injection on the more delay side than a main fuel injection timing. The first set value Vp1 and the second set value Vp2 are each located on the side where the estimated flow speed is higher as an engine speed is higher detected by an operating condition detector (a crank angle sensor SW7).SELECTED DRAWING: Figure 15 【課題】気筒内の流動状態を推定し、流動状態に応じて燃料噴射を行うことにより、燃焼変動を抑制させる。【解決手段】エンジンシステムは、検査点火により生じた放電経路のパラメータに基づいて推定される推定流速が第１設定値Ｖｐ１未満であるか又は該第１設定値Ｖｐ１よりも高い第２設定値Ｖｐ２よりも高いときに、主燃料噴射時期よりも遅角側で補助的な燃料噴射である補助燃料噴射を行うようにインジェクタ６を制御する補助燃料噴射部８４を備える。第１設定値Ｖｐ１及び第２設定値Ｖｐ２は、運転状態検出器（クランク角センサＳＷ７）が検出するエンジン回転数が高いほど推定流速が高い側に位置する。【選択図】図１５