CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To suppress the lowering of the accuracy of an introduction amount of fresh air when a fresh air introduction valve is opened due to an influence of a leaked gas containing exhaust emission which leaks to an upstream side from a downstream side when the fresh air introduction valve is closed.SOLUTION: A control device estimates a leaked gas amount of a gas which leaks to an upstream side from a downstream side of a fresh air introduction valve when the fresh air introduction valve is closed. When the leaked gas amount reaches a prescribed value or larger when there is a requirement for opening the fresh air introduction valve, a control device decides a target opening of the fresh air introduction valve on the basis of an engine rotational speed and intake pressure, and calculates a corrective opening with respect to the target opening on the basis of the leaked gas amount. Then, the control device opens the fresh air introduction valve by the corrective opening when the corrective opening is larger than the target opening, and discharges a leaked gas which is accumulated in a fresh air introduction passage together with a necessary amount of fresh air.SELECTED DRAWING: Figure 3 【課題】新気導入弁の閉弁時に下流側から上流側へ漏れ出た排気を含む漏洩ガスの影響によって、新気導入弁を開いたときの新気の導入量の精度が低下することを抑制する。【解決手段】制御装置は、新気導入弁の閉弁時に新気導入弁の下流側から上流側へ漏れ出たガスの漏洩ガス量を推定する。新気導入弁を開く要求があったときに漏洩ガス量が所定値以上になっている場合には、制御装置は、エンジン回転速度と吸気圧とに基づいて新気導入弁の目標開度を決定するとともに、目標開度に対する補正開度を漏洩ガス量に基づいて算出する。そして、新気導入弁を補正開度の分だけ目標開度よりも大きい開度に開き、新気導入通路に溜まっている漏洩ガスを必要量の新気とともに吸気通路に流し出す。【選択図】図３