| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an internal combustion engine capable of surely restraining adding fuel from being discharged as exhaust gas when detecting the catalytic deterioration. <P>SOLUTION: This exhaust emission control device has an oxidation catalyst 3 arranged in an exhaust passage of the internal combustion engine, a filter 4 with a catalyst for carrying the catalyst and removing particulate matter included in the exhaust gas, a fuel adding valve 8 for adding fuel to the oxidation catalyst 3, temperature sensors 5 and 6 as a catalyst bed temperature detecting means for detecting the catalyst bed temperature of the oxidation catalyst 3, an oxidation catalyst deterioration detecting means 9 for detecting a deterioration degree of the oxidation catalyst 3 based on a change in the catalyst bed temperature of the oxidation catalyst caused by adding the fuel to the oxidation catalyst 3 by the fuel adding valve 8, and a filter catalyst deterioration detecting means 9 for detecting a deterioration degree of the catalyst of the filter with the catalyst, and has a fuel adding quantity adjusting means 9 for adjusting an adding quantity of the fuel in response to the deterioration degree of the catalyst of the filter 4 with the catalyst when detecting the deterioration degree of the oxidation catalyst 3 by the oxidation catalyst deterioration detecting means 9. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
