Patents by Inventor Campbell R. McConnell

Campbell R. McConnell has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9169765
    Abstract: A method of regenerating a diesel particulate filter involves directing an exhaust stream from a combustion engine through the diesel particulate filter and selectively introducing a syngas stream at least periodically into the diesel particulate filter to regenerate it. The syngas stream is introduced at a first average flow rate during an initial regeneration stage and at a second average flow rate during a subsequent regeneration stage. In preferred embodiments the flow rate is varied in order to reduce temperature spikes and/or the rate at which CO slips through the filter during regeneration. In certain embodiments the first average flow rate is lower than the second average flow rate.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: October 27, 2015
    Assignee: WESTPORT POWER INC.
    Inventors: Campbell R. McConnell, Paul Sebright Towgood
  • Patent number: 8631647
    Abstract: A system and method for regenerating a device in an engine exhaust after-treatment system is provided. To regenerate the device, a syngas stream is introduced into the engine exhaust stream and combusts in the presence of a catalyst in the after-treatment system, raising the temperature. A supplemental liquid fuel stream is then selectively introduced into and is vaporized by the syngas stream to form a combined fuel stream. Combustion of the combined fuel stream with the engine exhaust in the presence of the catalyst further heats the device bringing it to a temperature suitable for regeneration. The catalyst can be upstream of or within the device being regenerated.
    Type: Grant
    Filed: January 21, 2011
    Date of Patent: January 21, 2014
    Assignee: Westport Power Inc.
    Inventors: Jacobus Neels, Richard Sederquist, Xuantian Li, Lasitha Cumaranatunge, Campbell R. McConnell
  • Publication number: 20110173953
    Abstract: A system and method for regenerating a device in an engine exhaust after-treatment system is provided. To regenerate the device, a syngas stream is introduced into the engine exhaust stream and combusts in the presence of a catalyst in the after-treatment system, raising the temperature. A supplemental liquid fuel stream is then selectively introduced into and is vaporized by the syngas stream to form a combined fuel stream. Combustion of the combined fuel stream with the engine exhaust in the presence of the catalyst further heats the device bringing it to a temperature suitable for regeneration. The catalyst can be upstream of or within the device being regenerated.
    Type: Application
    Filed: January 21, 2011
    Publication date: July 21, 2011
    Inventors: Jacobus Neels, Richard Sederquist, Xuantian Li, Lasitha Cumaranatunge, Campbell R. McConnell
  • Publication number: 20100005788
    Abstract: A method of regenerating a diesel particulate filter involves directing an exhaust stream from a combustion engine through the diesel particulate filter and selectively introducing a syngas stream at least periodically into the diesel particulate filter to regenerate it. The syngas stream is introduced at a first average flow rate during an initial regeneration stage and at a second average flow rate during a subsequent regeneration stage. In preferred embodiments the flow rate is varied in order to reduce temperature spikes and/or the rate at which CO slips through the filter during regeneration. In certain embodiments the first average flow rate is lower than the second average flow rate.
    Type: Application
    Filed: July 14, 2009
    Publication date: January 14, 2010
    Inventors: Campbell R. McConnell, Paul Sebright Towgood
  • Publication number: 20080314032
    Abstract: A particulate filter is fluidly connected to and disposed downstream from a diesel engine exhaust stream outlet. The filter has a plurality of filter segments that have differing physical properties or structural characteristics such that the engine exhaust stream to fuel stream ratio is maintained substantially consistent among segments during their regeneration. A method for regenerating a segmented filter comprises maintaining the engine exhaust stream to fuel stream ratio substantially consistent among segments during their regeneration.
    Type: Application
    Filed: May 15, 2008
    Publication date: December 25, 2008
    Inventors: Xuantian Li, Paul Sebright Towgood, Campbell R. McConnell, Erik Paul Johannes