| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an internal combustion engine capable of enhancing setting accuracy of a reducing agent supply quantity, when controlling a rich spike, without receiving influence by the deterioration in a TWC. <P>SOLUTION: This exhaust emission control device of the internal combustion engine has the TWC 7 arranged on the upstream side of an exhaust passage, an LNC 9 arranged on this downstream side, an estimating means of a NOx quantity adsorbed to the TWC, and an estimating means of a reducing agent quantity consumed by the TWC, and has a correcting means for correcting the reducing agent quantity supplied to the LNC by taking into consideration NOx adsorbing capacity of the TWC and/or an increase-decrease in reducing agent consumption, a first learning correcting means on a change in the reducing agent consumption caused by the deterioration in the TWC, and a second learning correcting means on a change in a NOx adsorbing quantity and/or NOx reducing performance caused by the deterioration in the TWC. <P>COPYRIGHT: (C)2008,JPO&INPIT |
