| 摘要 |
PROBLEM TO BE SOLVED: To provide urea addition control device capable of performing an efficient urea addition in consideration of ash accumulated at SCRF and provide a learning device capable of learning maximum ammonia absorption amount corresponding to an amount of ash.SOLUTION: ECU 11 acting as urea addition control device and a learning device estimates an amount of ash accumulated at SCRF 1 on the basis of an ash amount estimation model 14 and estimates the maximum absorption amount that can be absorbed at SCRF 1 on the basis of the ash amount and an absorption amount estimation model 15. Urea addition through urea adding valve 2 is controlled on the basis of the maximum ammonia absorption amount. In addition, after completion of regenerative processing for igniting and removing Soot accumulated at SCRF 1, ammonia slip is intentionally generated through addition of urea and the ammonia slip is detected by NOx sensor 10. A total amount of addition of urea ranging from starting of addition of urea to detection of ammonia slip is reflected against the absorption amount estimation model 15 or the ash amount estimation model 14.SELECTED DRAWING: Figure 1 |
