| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a catalyst deterioration detecting device capable of determining deterioration with higher accuracy. <P>SOLUTION: In an exhaust emission control system comprising an oxidation catalyst 3 provided at an exhaust gas passage of an internal combustion engine and a fuel addition valve 8 for adding fuel to the oxidation catalyst 3, the catalyst deterioration detecting device detects the deterioration of the oxidation catalyst 3. After the fuel addition valve 8 completes addition of the fuel of a required amount to the oxidation catalyst 3, the device calculates discharge calorie discharged from the oxidation catalyst 3 to the downstream and determines the deterioration of the oxidation catalyst 3 based on the calculated discharge calorie. <P>COPYRIGHT: (C)2009,JPO&INPIT |
