| 摘要 |
<P>PROBLEM TO BE SOLVED: To restrain filter temperature from dropping when the operation condition of an internal combustion engine is in a transitional state during a filter-regeneration control in an exhaust emission control system of the internal combustion engine provided with a filter in the exhaust passage in order to collect PM in the exhaust gas. <P>SOLUTION: In the filter regeneration control, filter temperature is raised to a command temperature by supplying unburned fuel to a catalyst having function of oxidation. If the engine operation condition is in a transitional state in the filter-regeneration control, the amount of unburned fuel to be supplied to the catalyst is corrected to be increased more than a reference supply amount. In this case, if the engine operation condition is in a transitional state to raise the engine-load, the amount of increase correction of unburned fuel is determined on the basis of the rate of increase in the intake air-flow of the engine (S105, S106). If the engine operation condition is in a transitional state in which the engine-load is reduced, the amount of increase correction of the unburned fuel is determined on the basis of temperature of the catalyst (S110, S111). <P>COPYRIGHT: (C)2006,JPO&NCIPI |
