| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust gas purifying device for an internal combustion engine to suppress and restore poisoning of a catalyst 12 in an exhaust gas passage 4 by trapping a sulfur content in blow-by gas. <P>SOLUTION: The internal combustion engine 1 is provided with an S trap 11 to trap a sulfur content in blow-by gas situated in a blow-by gas passage 3 through which blow-by gas 9 is re-circulated from a crank case 8 to a suction system (a suction passage 2). Sulfur content in the blow-by gas is trapped by an SOx trap agent in the S trap 11. As a result, S-poisoning of an exhaust catalyst 12 can be suppressed, and a frequency to effect S-poisoning restoration treatment can be remarkably decreased. Further, since an SOx trap agent can trap not only a sulfur content in the blow-by gas 9 but also a phosphorus content, lowering of oxidation activity of the catalyst can be suppressed and ash accumulated at the exhaust catalyst 12 can be also reduced. <P>COPYRIGHT: (C)2003,JPO |
