| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine, suppressing deterioration in accuracy of estimation of a PM deposition amount in a particulate filter, by invalidating an estimation method of the PM deposition amount using differential pressure of the particulate filter after cold start. <P>SOLUTION: After engine starts (S10), an estimation value of a PM deposition amount in the DPF stored in a memory in stop of the engine is called (S20), current differential pressure is measured (S30), and a current PM deposition amount is estimated from the differential value (S40). Difference between both estimation values is calculated, PM deposition amount estimation using the differential pressure is validated if the difference is smaller than a predetermined value A1 (S60), and on the other hand, PM deposition amount estimation using the difference is invalidated to validate estimation using operation history (S70) if the difference is larger than the predetermined value A1. <P>COPYRIGHT: (C)2010,JPO&INPIT |
