| 摘要 |
<P>PROBLEM TO BE SOLVED: To correctly grasp the poisoning amount of a bypass catalytic converter 8, and to prevent heat deterioration of the bypass catalytic converter 8 and deterioration in operation performance, caused by excessive poisoning detoxification control, by preventing the excessive poisoning detoxification control. <P>SOLUTION: The upstream side of a main passage 3 with a main catalytic converter 4 interposed therein is closed by a bypass valve 5, thereby allowing exhaust gas to flow into a bypass passage 7 with the bypass catalytic converter 8 interposed therein. When the main passage 3 is closed by the bypass valve 5, the poisoning amount of the bypass catalytic converter 8 is added and reduced based on catalyst temperature, and when the poisoning amount reaches a predetermined poisoning detoxification determination amount and a predetermined operating condition is satisfied, the poisoning detoxification control is performed. <P>COPYRIGHT: (C)2010,JPO&INPIT |
