Exhaust gas cleaning device with filter and nitrogen oxide converter, regenerates filter by burning accumulated particles using recirculated nitrogen oxides

摘要

The filter (3) is regenerated by burning the accumulated particles using nitrogen oxide obtained by recirculating some of the cleaned gas. A device (1) for cleaning exhaust gases from an internal combustion engine comprises a device (2) for converting at least some of the nitrogen monoxide in the gas into nitrogen dioxide and at least one filter for removing particles. A device (8) is provided for recirculating some of the gas which has passed through the converter and filter to a point between the filter and engine, in order to obtain nitrogen oxides used to regenerate the filter by combustion of the accumulated particles. An Independent claim is also included for a regeneration method for a filter used to remove particles in an exhaust gas cleaning device.