CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To provide a control device for an internal combustion engine that can appropriately control a compression ratio and ignition timing until the compression ratio reaches a target compression ratio set according to humidity.SOLUTION: A control device for an internal combustion engine controls the internal combustion engine and includes: cylinders; humidity detection means for detecting humidity of outside air supplied to the cylinder; a variable compression ratio mechanism for changing a compression ratio of the cylinder; and an ignition device for igniting an air-fuel mixture in the cylinder. The control device includes: a compression ratio control section for controlling the variable compression ratio mechanism; and an ignition control section for controlling ignition timing of the ignition device. Correspondence characteristics of the compression ratio and the ignition timing are determined with respect to each humidity in accordance with a predetermined condition related to an operating state of the internal combustion engine. The compression ratio control section determines a target compression ratio of the variable compression ratio mechanism according to the detected humidity. The ignition control section controls the ignition device on the basis of the correspondence characteristics determined according to the detected humidity while the variable compression ratio mechanism changes the compression ratio to the target compression ratio.SELECTED DRAWING: Figure 4 【課題】湿度に応じて設定した目標圧縮比に至るまでの間において、適切に圧縮比及び点火時期を制御することができる内燃機関の制御装置を提供することを目的とする。【解決手段】気筒と、前記気筒に供給される外気の湿度を検出する湿度検出手段と、前記気筒の圧縮比を変更する可変圧縮比機構と、前記気筒内の混合気に点火する点火装置と、を備える内燃機関を制御する内燃機関の制御装置であって、前記可変圧縮比機構を制御する圧縮比制御部と、前記点火装置の点火時期を制御する点火制御部と、を備え、圧縮比と点火時期との対応特性が内燃機関の動作状態に関する所定の条件に従って湿度ごとに決定され、前記圧縮比制御部は、検出された湿度に応じて前記可変圧縮比機構の目標圧縮比を決定し、前記点火制御部は、前記可変圧縮比機構が圧縮比を前記目標圧縮比まで変化させる間、検出された湿度に応じて決定された対応特性に基づいて前記点火装置を制御する。【選択図】図４