Patent ID: 7415818
Filing Date: 2008-08-26
Classification: F01N,F02D,Y02T

Abstract:
1. A control device of an internal combustion engine comprising: a three-way catalyst disposed in an exhaust passage of an internal combustion engine; basic fuel injection quantity operation means for operating a basic fuel injection quantity; fuel injection quantity compensation amount operation means for operating a compensation amount of said basic fuel injection quantity so that an air-fuel ratio upstream from said three-way catalyst is coincident with a target air-fuel ratio; fuel injection quantity operation means for operating a fuel injection quantity that is obtained by the compensation of said basic fuel injection quantity with said basic fuel injection quantity compensation amount; oxygen occlusion properties activity detection means for detecting an activity of oxygen occlusion properties of said three-way catalyst; and target air-fuel ratio operation means for setting said target air-fuel ratio based on the activity of oxygen occlusion properties that is obtained by said oxygen occlusion properties activity detection means, wherein said target air-fuel ratio operation means causes a target air-fuel ratio to be more lean than a theoretical air-fuel ratio during a predetermined time period at time points of a predetermined increase in activity of oxygen occlusion properties.