| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately determine a failure of a PM sensor. <P>SOLUTION: An exhaust emission control device includes: a selective reduction type NOx catalyst, which is disposed in an exhaust passage of an internal combustion engine and reduces NOx by a supplied reducing agent; a supply device, which supplies the reducing agent from an upstream side rather than from the selective reduction type NOx catalyst; a PM sensor, which detects an amount of particulate matter in the exhaust downstream the selective reduction type NOx catalyst; and a determining unit, which increases an amount of the reducing agent supplied by the supply device on carrying out failure determination of the PM sensor, and which determines that the PM sensor is normal, if the detection value of the PM sensor changes. <P>COPYRIGHT: (C)2013,JPO&INPIT |
