Patent ID: 7992382
Filing Date: 2011-08-09
Classification: B01D,F01N,Y02A,Y02T

Abstract:
1. A particulate trap system for an exhaust system of an internal combustion engine, the system including: (a) a wall-flow particulate trap having a plurality of contiguous porous walls and having an inlet and an outlet; (b) an upstream conduit for carrying unfiltered exhaust gas from an internal combustion engine to the inlet of the trap; (c) a downstream conduit for carrying filtered exhaust gas from the outlet of the trap to the atmosphere, the pressure in the downstream conduit being less than the pressure in the upstream conduit to provide a forward pressure drop across the trap; (d) a remotely actuated valve in the downstream conduit for periodically increasing the pressure throughout the exhaust system upstream of the valve and including the trap; (e) a reversing apparatus for periodically creating a reverse pressure drop across a portion of the contiguous walls of the trap while allowing a forward pressure drop across the balance of the contiguous walls of the trap to dislodge accumulated particulate and cause a portion of the filtered exhaust gas to flow back through the portion of the contiguous porous walls from the outlet to the inlet to remove particulate therefrom while allowing the unfiltered exhaust gas to simultaneously flow through the balance of the contiguous porous walls from the inlet to the outlet for filtering; and (f) controls for actuating the valve and the reversing apparatus.