CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

To provide a control device for an internal combustion engine capable of satisfactorily controlling an air-fuel ratio of mixture without excessively enriching it during air scavenging control while securing execution of the air scavenging control through relatively simple control.SOLUTION: An F/B co...

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Bibliographische Detailangaben
Hauptverfasser: MAEDA TSUYOSHI, KURAHASHI KEN, YAMADA YUKI
Format: Patent
Sprache:eng ; jpn
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Beschreibung
Zusammenfassung:To provide a control device for an internal combustion engine capable of satisfactorily controlling an air-fuel ratio of mixture without excessively enriching it during air scavenging control while securing execution of the air scavenging control through relatively simple control.SOLUTION: An F/B correction coefficient KAF for correcting a fuel injection amount GFUEL in such a manner that an equivalent ratio KACT detected by a LAF sensor 33 becomes a target equivalent ratio KCMD is calculated by using feedback control including a predetermined gain (step 6) and further, a reference F/B correction coefficient KREFX is set. Air scavenging control is executed for air-scavenging the inside of a combustion chamber by blowing through intake air by changing valve overlap properties of an intake valve and an exhaust valve in a supercharge state (step 15). During the air scavenging control, while the F/B correction coefficient KAF is changed in a direction of correcting the fuel injection amount GFUEL to a richer side in relative to the reference F/B correction coefficient KREFX, the gain of the feedback control is reduced (step 20).SELECTED DRAWING: Figure 5 【課題】比較的簡便な制御により、掃気制御の実行を確保しながら、掃気制御中、混合気の空燃比を過度にリッチ化させず、良好に制御できる内燃機関の制御装置を提供する。【解決手段】本発明では、LAFセンサ33による検出当量比KACTが目標当量比KCMDになるように燃料噴射量GFUELを補正するF/B補正係数KAFが、所定のゲインを含むフィードバック制御を用いて算出され(ステップ6)、さらに基準F/B補正係数KREFXが設定される。過給状態で、吸気弁と排気弁とのバルブオーバーラップ特性を変更することで、吸気の吹き抜けにより燃焼室内を掃気する掃気制御が実行される(ステップ15)。この掃気制御中、F/B補正係数KAFが基準F/B補正係数KREFXに対して、燃料噴射量GFUELをよりリッチ側に補正する方向に変化しているときに、フィードバック制御のゲインが低減される(ステップ20)。【選択図】図5