CONTROL DEVICE FOR HYBRID VEHICLE

To suppress occurrence of failure in which fuel economy and an exhaust gas deteriorate according to the resumption of a catalyst deterioration diagnosis after re-start of an internal combustion engine as the internal combustion engine stops in the middle of the catalyst deterioration diagnosis, in a control device for a hybrid vehicle which is used for a hybrid vehicle on which an internal combustion engine and an electric motor are mounted as a power source, estimates oxygen storage capacity of a catalyst for exhaust gas purification mounted on an exhaust passage of the internal combustion engine, and performs catalyst deterioration diagnosis control for diagnosing whether or not the catalyst has deteriorated by determining whether or not the oxygen storage capacity is equal to or greater than a threshold value.SOLUTION: A period is set in which estimation of oxygen storage capacity of a catalyst is not performed immediately after start of catalyst deterioration diagnosis control, execution of the catalyst deterioration diagnosis control is permitted in the case where an operation state of an internal combustion engine is a predetermined state, and execution of the catalyst deterioration diagnosis control is not permitted in the case where the operation state of the internal combustion engine is other than the predetermined state.SELECTED DRAWING: Figure 2 【課題】動力源として内燃機関及び電動機が搭載されたハイブリッド車両に用いられ、内燃機関の排気通路に装着されている排気ガス浄化用の触媒の酸素吸蔵能力を推定し、その酸素吸蔵能力が閾値以上であるか否かを判定することで触媒が劣化しているかどうかを診断する触媒劣化診断制御を行うハイブリッド車両の制御装置において、触媒劣化診断の途中で内燃機関が停止し、内燃機関の再始動後に触媒劣化診断が再開されることに伴い燃費や排気ガスが悪化する不具合の発生を抑制する。【解決手段】触媒劣化診断制御の開始直後に触媒の酸素吸蔵量の推定を行わない期間を設定し、内燃機関の動作状態が所定の状態以外である場合には触媒劣化診断制御の実行を許可し、内燃機関の動作状態が所定の状態以外である場合には触媒劣化診断制御の実行を許可しないようにする。【選択図】図２