| 摘要 |
Provided is a storage amount estimation device for a NOx storage reduction-type catalyst 32 disposed in the exhaust gas system of an engine 10, said NOx storage reduction-type catalyst 32 storing NOx contained in an exhaust gas in a lean exhaust gas state and reducing/purifying the stored NOx in a rich exhaust gas state. An ECU 50 is provided with a NOx storage amount computation unit 77 that acquires, on the basis of the temperature of the NOx storage reduction-type catalyst 32, the NOx-equivalent amount of the SOx stored in the NOx storage reduction-type catalyst 32, and estimates, on the basis of the NOx-equivalent amount and the amount of NOx accumulated in the NOx storage reduction-type catalyst 32, the total NOx storage amount stored in the NOx storage reduction-type catalyst 32. |
