| 摘要 |
PROBLEM TO BE SOLVED: To provide a catalyst using exhaust emission control device that shortens time where catalyst temperature reaches activation temperature as much as possible to maintain an exhaust emission control rate at a high level even in a low load operation where an exhaust flow rate is low.SOLUTION: A catalyst using exhaust emission control device 100 cleans an exhaust gas discharged from an internal combustion engine 101 via an exhaust pipe 102 by a catalyst. The catalyst using exhaust emission control device 100 includes catalyst effective volume changing means 116 for changing a catalyst effective volume based on an exhaust flow rate.SELECTED DRAWING: Figure 1 |
