| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique for more efficiently recovering the performance of an exhaust emission control device in an internal combustion engine equipped with two superchargers. <P>SOLUTION: Two turbines (10a, 20a) of the two-stage superchargers are disposed in an exhaust system of the internal combustion engine and the exhaust system is provided with two bypass passages (11, 21) for bypassing the respective turbines. When recovering such performance of the exhaust emission control device 7 as NOx reduction treatment, SOx poisoning recovery treatment or PM regeneration treatment, the performance recovery treatment is performed more efficiently by changing a combination of the two turbines (10a, 20a) and the two bypass passages (11, 21) through which the exhaust gas passes. <P>COPYRIGHT: (C)2008,JPO&INPIT |
