| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine capable of solving a clogging problem of a particulate filter with catalyst and ensuring the normal revolution of a turbine. SOLUTION: This exhaust emission control device is equipped with a turbocharger 14 arranged in exhaust passages 20, 70; an inlet side pressure detecting means 82 detecting exhaust pressure of an upper stream exhaust passage of the turbocharger 14; an outlet side air flow detecting means detecting the air flow compressed and sucked with the turbocharger 14; a filter 22 arranged in the exhaust passage 70, carrying an oxidation catalyst, and capturing fine particulates in the exhaust gas; a bypass passage 90 branched in the exhaust passages 20, 70 so that exhaust gas bypasses a filter 22 and the turbocharger 14; a bypass valve 91 opening/closing the bypass passage 90; and a control means 30 controlling the opening/closing of the bypass valve 91 on the basis of a value of the exhaust pressure and the air flow. |
