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High exhaust temperature, zoned, electrically-heated particulate matter filter

United States Patent

September 22, 2015
View the Complete Patent at the US Patent & Trademark Office
A system includes a particulate matter (PM) filter, an electric heater, and a control circuit. The electric heater includes multiple zones, which each correspond to longitudinal zones along a length of the PM filter. A first zone includes multiple discontinuous sub-zones. The control circuit determines whether regeneration is needed based on an estimated level of loading of the PM filter and an exhaust flow rate. In response to a determination that regeneration is needed, the control circuit: controls an operating parameter of an engine to increase an exhaust temperature to a first temperature during a first period; after the first period, activates the first zone; deactivates the first zone in response to a minimum filter face temperature being reached; subsequent to deactivating the first zone, activates a second zone; and deactivates the second zone in response to the minimum filter face temperature being reached.
Gonze; Eugene V. (Pinckney, MI), Paratore, Jr.; Michael J. (Howell, MI), Bhatia; Garima (Bangalore, IN)
11/ 950,545
December 5, 2007
STATEMENT OF GOVERNMENT RIGHTS This disclosure was produced pursuant to U.S. Government Contract No. DE-FC-04-03 AL67635 with the Department of Energy (DoE). The U.S. Government has certain rights in this disclosure.