| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an abnormality detecting method for a reducing agent for detecting a case of incorrectly supplying a reducing agent at a low concentration or water to a reducing agent tank. <P>SOLUTION: There is disclosed the method for detecting abnormality in the reducing agent 17 supplied to a reducing agent tank 14, in an exhaust purification device wherein the reducing agent 17 is added from the reducing agent tank 14 to a selective reduction type catalyst 10 on the way of an exhaust pipe 9 to thereby reduce and purify NOx, comprising: when a decrease is detected in a NOx purification ratio, examining the presence or absence of NH3 slip; and deciding that the selective reduction type catalyst 10 is degraded when NH3 slip is observed, or deciding that the reducing agent 17 at a low concentration and/or some substance other than the reducing agent are supplied to the reducing agent tank 14 when NH3 slip is not observed. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
