| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust control device for an internal combustion engine efficiently suppressing generation of white smoke after sulfur poisoning regeneration control. <P>SOLUTION: In this exhaust emission control device for the internal combustion engine, an exhaust emission control means including a NOx occlusion agent is arranged on an exhaust passage, and when a sulfur content is required to be discharged from the NOx occlusion agent, the sulfur poisoning regeneration control including addition of a reducing agent to inside of the exhaust passage in the upstream side of the exhaust emission control means is performed (Step 103). The exhaust emission control device for the internal combustion engine is provided with a means for estimating the amount of the reducing agent adhering to inside of the exhaust passage. Upon completion of the sulfur poisoning regeneration control or discontinuance of the sulfur poisoning regeneration control before its completion (Step 107), when the amount of the reducing agent estimated by the estimation means exceeds a predetermined amount, the exhaust emission control device performs sulfur poisoning post-regeneration temperature control (Step 109) for predetermined time, for suppressing rise, maintenance or decline of temperature of a part from the vicinity of an adding position of the reducing agent up to reaching the exhaust emission control means of the exhaust passage while addition of the reducing agent is stopped, and then returns to ordinary control. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
