| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology capable of supplying an optimum amount of HC for a storage reduction type NOx catalyst by acquiring the amount of HC actually flowing in a storage reduction type NOx catalyst, in an exhaust emission control device of an internal combustion engine. SOLUTION: The amount of HC actually flowing in a NOx catalyst is calculated from a difference between air-fuel ratios on the upstream and downstream sides of the NOx catalyst when supplying HC from a HC supply means (S104). On the basis of the amount of HC, the amount of HC supplied from the HC supply means is corrected (S105, S106). COPYRIGHT: (C)2008,JPO&INPIT
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