| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an internal combustion engine capable of determining abnormal reduction of amount of additional fuel in regeneration by a NOx concentration sensor arranged on the downstream side of a NOx catalyst device. <P>SOLUTION: This exhaust emission control device has the NOx catalytic device, a fuel supply means for supplying the additional fuel in burnt gas flowing in the NOx catalytic device in regeneration, and the NOx concentration sensor arranged on the exhaust downstream side of the NOx catalytic device. When the NOx concentration detected by the NOx concentration sensor is the preset concentration or less in regeneration at this time (Step 104), a stored NOx quantity stored in the NOx catalytic device is estimated in a preset period up to regeneration of the next time by using the NOx concentration sensor (Step 105), and when the stored NOx quantity is less than a preset quantity (Step 106), the abnormal reduction of amount of the additional fuel is determined to have been caused in the regeneration at this time (Step 109). <P>COPYRIGHT: (C)2007,JPO&INPIT |
