| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a technique capable of detecting abnormality in a reduction agent feeding mechanism and to contribute to the suppression of deterioration of exhaust emission and exhaust emission purifying catalyst caused by abnormality in the reduction agent feeding mechanism in an exhaust emission control device for the internal combustion engine equipped with the mechanism feeding a reduction agent in exhaust emission purifying catalyst. SOLUTION: This exhaust emission control device for the internal combustion engine comprises a reduction agent adding nozzle arranged in an exhaust passage located upstream from the exhaust emission purifying catalyst, a reduction agent feeding passage introducing the reduction agent emitted from a reduction agent emission means to the reduction agent adding nozzle, a passage opening and closing valve provided in the reduction agent feeding passage, a pressure detection means provided in the reduction agent feeding passage located downstream from the passage opening and closing means, and an abnormality determining means for determining abnormality on the basis of pressure detected by the pressure abnormality detection means during the opening period of the passage opening and closing valve, and before and after the opening period of the valve.</p> |
