| 摘要 |
<P>PROBLEM TO BE SOLVED: To speedily recover a temporary operational failure of an injector caused by the sticking of a urea crystal. <P>SOLUTION: In a control method for recovering a temporary operational failure of an injector 8 which adds urea water 12 to exhaust gas caused by the sticking of the urea crystal, a piping layout is configured in such a manner that a passage (suction line 14) for supplying the urea water 12 is moved down from an upper part than the injector 8 and connected to the injector 8. When the operational failure of the injector 8 is determined, a pump 13 is stopped after interposing operation for temporarily sucking back the urea water 12 in the passage (suction line 14). After the lapse of a predetermined time, the pump 13 is driven again and the operational defect of the injector 8 is determined again. <P>COPYRIGHT: (C)2013,JPO&INPIT |
