EXHAUST PURIFYING DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

An exhaust purifying device for an internal combustion engine releases a minimum of nitrogen oxide to the outside in a cold start of the engine. The exhaust purifying device has a filter (30) for capturing particle matter contained in exhaust gas, a selective reduction catalytic converter (40) provided downstream of the filter (30) and reducing nitrogen oxide, an oxidation catalytic converter (25) provided upstream of the selective reduction catalytic converter (40) and having an adsorbing function for temporarily adsorbing nitrogen oxide contained in the exhaust gas, a burner (20) for regenerating the filter (30) by raising the temperature of the exhaust gas, which flows into the filter (30), the selective reduction catalytic converter (40), and the oxidation catalytic converter (25), to raise the temperature of the filter (30) to a level higher than or equal to a predetermined regenerating temperature, and an ECU (100) for prohibiting, when the selective reduction catalytic converter (40) is not activated when the burner (20) is started up, the start-up of the burner (20).