| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a control device for an internal combustion engine provided with a catalyst having capability to store oxygen arranged in an exhaust passage, appropriately determining the capability of the catalyst to store oxygen while suppressing deterioration of fuel consumption. <P>SOLUTION: This control device for the internal combustion includes the internal combustion engine 10 having a plurality of cylinders, the catalyst 32 arranged in the exhaust passage 22 of the internal combustion engine 10 and having the capability to store oxygen, and a variable valve train 30 for variably setting the operating angle of a valve. When measuring the capability of the catalyst 32 to store oxygen, it is determined (step S204) whether or not a target operating angle is smaller than a lower limit of the operating angle with no variations in an air-fuel ratio between the cylinders. When the target operating angle is smaller than the lower limit, the target operating angle is varied to the lower limit (step S206). Preferably, after the actual operating angle is varied to the lower limit, measurement of the capability of the catalyst 32 to store oxygen is started (step S210). <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
