ENGINE CONTROLLER
To provide an engine controller that when the occurrence of failure due to air-fuel ratio deviation between cylinders continues, even if long-time learning by sub-feedback control accumulates, can correct an air-fuel ratio to a lean side to suppress exhaust gas.SOLUTION: A sub-feedback control means...
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| Format: | Patent |
| Sprache: | eng ; jpn |
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| Zusammenfassung: | To provide an engine controller that when the occurrence of failure due to air-fuel ratio deviation between cylinders continues, even if long-time learning by sub-feedback control accumulates, can correct an air-fuel ratio to a lean side to suppress exhaust gas.SOLUTION: A sub-feedback control means 32 adjusts a lean correction value, which is a value of the real-time correction amount at the time of lean correction, in a plurality of steps or steplessly, based on an integrated value of a lean residence time.SELECTED DRAWING: Figure 3
【課題】気筒間空燃比ずれ故障発生が持続した際に、サブフィードバック制御によるロングタイム学習が累積しても、リーン側への補正が可能であるようにして、排出ガスを抑制する。【解決手段】サブフィードバック制御手段３２が、リアルタイム補正量の、リーン補正する際の値であるリーン補正値を、リーン滞留時間の積算値に基づいて複数段階で又は無段階で調整する。【選択図】図３ |
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