| 摘要 |
<P>PROBLEM TO BE SOLVED: To oxidize and remove PM accumulated on a filter, while inhibiting degradation of exhaust gas emission and fuel-economy in an exhaust emission control system of an internal combustion engine provided with the filter in the exhaust gas passage of the engine for collecting PM in the exhaust gas. <P>SOLUTION: In the exhaust emission control system, a catalyst having the function of oxidation is placed in the exhaust gas passage upstream of the filter, or it is carried on the filter. The filter is regenerated by supplying unburned fuel to the catalyst. If the adhesion of unburned fuel on the passage reaches at least a specified amount in the filter-regeneration control, an exhaust gas temperature-raising control is started so at to raise the temperature of exhaust gas by raising the engine load. Thereafter, the exhaust gas temperature-raising control is stopped in the timing when the amount of adhesion of unburned fuel on the passage, which increases again upon stop of the exhaust gas temperature-raising control, becomes at most the specified amount of adhesion when the filter regeneration control is stopped. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
