| 摘要 |
PROBLEM TO BE SOLVED: To suppress a part nearby one end of an exhaust gas purification catalyst from being raised in temperature with an exhaust gas flowing in the exhaust gas purification catalyst owing to pulsation of the exhaust gas when an exhaust gas of high temperature is made to flow through a bypass passage in a constitution where an exhaust gas passage of an internal combustion engine is provided with the bypass passage for bypassing the exhaust gas purification catalyst.SOLUTION: In constitution where a control valve 5 blocking an exhaust gas passage 1 when an exhaust gas is made to flow to a bypass passage 4 is provided between a connection part for an upstream-side end of the bypass passage 4 of the exhaust passage 1 and an exhaust gas purification catalyst 2 or between a connection part for a downstream-side end of the bypass passage 4 of the exhaust passage 1 and the exhaust gas purification catalyst 2, a mesh member 6 is provided in the exhaust passage 1 between the emission gas purification catalyst 2 and control valve 5 at a predetermined position which is at a shorter distance to the control valve 5 than that to the exhaust gas purification catalyst 2.SELECTED DRAWING: Figure 1 |
