| 摘要 |
A controlling device for internal combustion engines provided with a filter downstream of a catalyst having an oxidizing function comprises a controlling unit that maintains, when a PM regeneration request for the filter is satisfied, the exhaust temperature for a fixed period at a sulfur removal temperature that is lower than a PM oxidization starting temperature and that is higher than the maximum temperature reached by the exhaust or the bed of the catalyst from the time of completion of the previous PM regeneration to the current PM regeneration request, and then sets the exhaust temperature to be higher than the PM oxidation starting temperature. Thus, rapid removal of sulfur is avoided and thereby generation of white smoke can be suppressed. |
