Patent ID: 7967887
Filing Date: 2011-06-28
Classification: B01D

Abstract:
1. An exhaust aftertreatment filter for filtering engine exhaust flowing along an axial direction, said filter being composed of regenerable material regenerated by heat to burn-off trapped contaminant particulate from said engine exhaust, comprising an axially extending filter element having wall segments extending axially between upstream and downstream ends, said wall segments defining axial flow channels therebetween, said wall segments being alternately sealed to each other by a first set of plugs to define a first set of flow channels closed by said plugs, and a second set of flow channels interdigitated with said first set of flow channels and having open upstream ends, said wall segments being alternately sealed to each other by a second set of plugs closing said second set of flow channels, said first set of flow channels having open downstream ends, a designated constituent material provided by at least one of a) a constituent material of said second set of plugs and b) a coating material along at least some of said wall segments including adjacent said second set of plugs, said designated constituent material undergoing an energy level change at a designated temperature, said energy level change being selected from the group consisting of i) phase change and ii) melting, and selected such that said energy level change at said designated temperature requires additional energy to effect said energy level change, to reduce maximum temperature experienced by said filter including during regeneration including during said burn-off of trapped contaminant particulate, wherein said designated constituent material is said constituent material of said second set of plugs, said plugs consisting of said designated constituent material, and said designated constituent material is selected to melt at a temperature in the range 550° C. to 1000° C.