F - Mech Eng,Light,Heat,Weapons – 01 – N
Patent
F - Mech Eng,Light,Heat,Weapons
01
N
172/9
F01N 3/18 (2006.01) F01N 3/027 (2006.01)
Patent
CA 1244356
-15- ABSTRACT An apparatus and method is disclosed for continuously regenerating a particulate filter trap for an internal combustion engine. The apparatus has means for normally conducting the exhaust gas of the engine to and through the trap, the trap having a plurality of generally aligned flow channels extending from the entrance face of the trap. The apparatus comprises: (a) movable means effective to shield a segment of the trap entrance face from the full flow of exhaust gas while permitting a portion of the exhaust gas flow to bleed therethrough; (b) electrical resistance heating means having a movable heating element carried by the shield and interposed between the trap face and the shield; and (c) means for substantially continuously moving the shield and element conjointly across the trap face to ignite one or more columns of the particulates in the trap aligned with the shield and element, the ignited particles and bleed flow causing oxidation to proceed throughout the extent of the columns of particulates without need for additional exterior heat. A method is disclosed for regenerating a particulate trap, comprising: (a) slowly and conjointly moving a segmental shield and an electrical heating element across the entrance face while heating the shielded portion of the entrance face to a particulate ignition temperature, the segmental shield blocking off the full flow of the exhaust gases from the portion of the entrance face covered by the shield while permitting a portion of the exhaust gases to bleed therethrough; and (b) controlling the movement of the shield and element ot allow the heated bleed gas to ignite one or more columns of particulates in the trap aligned with the shield and element and to support oxidation of the particulates substantially along the entire length of the columns.
495934
Ford Motor Company Of Canada Limited
Sim & Mcburney
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