| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust heat recovery exhaust emission control device preventive of excessive heat recovery. <P>SOLUTION: The device comprises a catalyst part 20, and an exhaust heat recovery part 22 for performing heat exchange between exhaust gas passing through the catalyst part 20 and a heat exchanging medium. A selector valve 72 is provided between the catalyst part 20 and the exhaust heat recovery part 22 for changing over the flow of exhaust gas. The selector valve 72 selects a low-rate flow path 40 for introducing the exhaust gas passing through the catalyst part 20 via the exhaust heat recovery part 22 to an exhaust flow path on the downstream side or a high-rate flow path 44 for introducing the exhaust gas passing through the catalyst part 20 to an exhaust flow path on the downstream side. The exhaust heat recovery part 22 has an intermediate shell 24 into which an inside shell 1 is inserted and an outside shell 42 covering the outside of the intermediate shell 24. The low-rate flow path 40 is formed between the inside shell 1 and the intermediate shell 24, and the selector valve 72 is mounted at the end of the intermediate shell 24. The end of the intermediate shell 24 extends into a cylindrical shell 46 on the outside of the outside shell 42, and the end of the inside shell 1 on the side of a flow-out port 18 of the catalyst part extends near the selector valve 72. <P>COPYRIGHT: (C)2008,JPO&INPIT |
