Patent ID: 7273514
Filing Date: 2007-09-25
Classification: B01D,F01N,Y02T,Y10S

Abstract:
1. A particulate trap system for an internal combustion engine, comprising: a particulate trap module positioned to accept engine exhaust gas including a plurality of passages having porous walls for receiving the exhaust gas, wherein the porous walls filter particulates from the exhaust gas; a reversing apparatus, said reversing apparatus periodically reversing a portion of the filtered exhaust gas back through the porous walls in reverse flow at a pressure drop, resultant flow velocity, and duration sufficient to dislodge build-up of particulates from the porous walls; and a rotary valve, said rotary valve preventing exhaust gas entry into a minority of the passages and for connecting an entrance of the minority of the passages to a separation chamber, wherein the rotary valve rotates to sequentially cause reverse flow through the porous walls of each of the minority of the passages while permitting normal flow to continue through the porous walls of a majority of the trap passages.