| 摘要 |
The present device for purifying the exhaust gas of an internal combustion engine comprises a particulate filter 6 disposed in the engine exhaust system 3, a fresh intake air detection means 5 for detecting an amount of fresh intake air introduced into the engine intake system 2, a throttle valve control means for increasing an opening degree of throttle valve 4 to a set opening degree according to a fuel-cut order, and a trapped particulates amount estimation means for estimating an amount of particulates trapped on the particulate filter by comparison of the amount of fresh intake air detected by the fresh intake air detection means, after the throttle valve is made the set opening degree by the throttle valve control means, and a reference value. The device comprises an abnormal engine output detection means for detecting an abnormal engine output in which the engine output increases abnormally. When the abnormal engine output detection means detects the abnormal engine output, it is prevented that the throttle valve control means increases an opening degree of the throttle valve. <IMAGE> |
