Patent ID: 7909916
Filing Date: 2011-03-22
Classification: F01N

Abstract:
1. A method comprising: obtaining a particulate filter, said particulate filter including a honeycomb filter body made of porous material with mutually adjacent passages with plugged inlets and passages with plugged outlets, and said particulate filter including particulates captured from exhaust gas; filling, in the particulate filter including particulates captured from the exhaust gas, each of the passages with unplugged outlets with a filler material so as to reduce an inner volume of the passages, wherein the filter material is fine particulates with a mean diameter larger than that of pores of porous thin walls of the particulate filter; wherein the filling includes filling the passages with unplugged outlets so that the filler material to a height over that of a lower boundary of the particulates captured from the exhaust gas when the particulate filter is oriented with its downstream end in a direction of flow of exhaust gas directed upward; and blowing backwash air into said passages with the unplugged outlets that include the filler material.