| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reliably collect and appropriately purify particulates in exhaust gas and to prevent damage to a filter due to a temperature rise, in an exhaust emission control device for an internal combustion engine. <P>SOLUTION: During the execution of regenerative treatment of the filter 21, if the flow rate of exhaust gas flowing into the filter 21 is shifted to a specific operating state wherein the flow rate drops, a post injection is employed to supply CO and HC to an oxidation catalyst 22, which in turn elevates the temperature of exhaust gas at an inlet of a turbine 20, increases the energy of stages to increase turbine work, and increase the exhaust gas flow rate flowing into the filter 21, so that the increased exhaust gas removes heat generated by rapid combustion in the filter 21 to prevent an excessive temperature rise. <P>COPYRIGHT: (C)2003,JPO</p> |
