| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust purification system which shortens a regeneration processing time while securing reliability at avoiding overheating. <P>SOLUTION: The system comprises a filter for collecting a PM which is a particulate included in the exhaust of an internal combustion engine; a combustion catalyst carried by the filter, and activated by being heated to a predetermined activating temperature or higher to promote the combustion of the PM; and an ECU 40 (heating control equipment) which controls an exhaust gas temperature by controlling a post injection quantity in order to set the combustion catalyst in an activation temperature or higher. An alkaline catalyst is employed to the fuel catalyst, wherein the alkaline catalyst is activated at a temperature lower than the exhaust gas temperature (overtemperature generation temperature) which may increase the temperature of the filter up to a limit temperature during the idling time of the engine. By means of the regeneration target temperature calculation means 43, according to the accumulation quantity of the PM which is accumulated in the filter, a regeneration target temperature for the filter inlet temperature is calculated, and the exhaust gas temperature is controlled by means of the exhaust gas temperature control means 44 to reach a regeneration target temperature. <P>COPYRIGHT: (C)2010,JPO&INPIT |
