| 摘要 |
<P>PROBLEM TO BE SOLVED: To restrain degradation of an emission due to lowing of an oxidation function of an EGR catalyst by surely recovering lowering of the oxidation function of the EGR catalyst due to SOF in an EGR gas, in a emission control system of an internal combustion engine having an EGR passage provided with the EGR catalyst. <P>SOLUTION: The emission control system of the internal combustion engine 1 comprises: the EGR passage 22; an EGR cooler 24; and the EGR catalyst 23 arranged to an upstream side of the EGR cooler 24. In the emission control system of the internal combustion engine 1, when it is determined that the oxidation function of the EGR catalyst 23 is lowered and is in an SOF poisoning state, a temperature of the EGR catalyst 23 is increased to be an SOF removing temperature, to recover the oxidation function of the EGR catalyst 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
