Patents by Inventor Waratt Rattasiri

Waratt Rattasiri 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).

  • NOadsorber catalyst condition evaluation apparatus and associated methods
    Patent number: 8756922
    Abstract: According to one embodiment, an apparatus for evaluating the condition of a NOx adsorber catalyst (NAC) of an internal combustion engine system includes a rich condition timing module, NAC outlet lambda module, and NAC condition module. The rich condition timing module is configured to accumulate the total time during which exhaust gas exiting the NAC has a lambda value less than 1.0. The NAC outlet lambda module is configured to store NAC outlet lambda values of the exhaust gas while the exhaust gas exiting the NAC has a lambda value less than 1.0. The NAC condition module is configured to evaluate the condition of the NAC based on the total time during which exhaust gas exiting the NAC has a lambda value less than 1.0 and an accumulation of the stored NAC outlet lambda values.
    Type: Grant
    Filed: June 10, 2011
    Date of Patent: June 24, 2014
    Assignee: Cummins IP, Inc.
    Inventors: Waratt Rattasiri, Neal W. Currier, Mathew L. Allen
  • NOx ADSORBER CATALYST CONDITION EVALUATION APPARATUS AND ASSOCIATED METHODS
    Publication number: 20120311995
    Abstract: According to one embodiment, an apparatus for evaluating the condition of a NOx adsorber catalyst (NAC) of an internal combustion engine system includes a rich condition timing module, NAC outlet lambda module, and NAC condition module. The rich condition timing module is configured to accumulate the total time during which exhaust gas exiting the NAC has a lambda value less than 1.0. The NAC outlet lambda module is configured to store NAC outlet lambda values of the exhaust gas while the exhaust gas exiting the NAC has a lambda value less than 1.0. The NAC condition module is configured to evaluate the condition of the NAC based on the total time during which exhaust gas exiting the NAC has a lambda value less than 1.0 and an accumulation of the stored NAC outlet lambda values.
    Type: Application
    Filed: June 10, 2011
    Publication date: December 13, 2012
    Inventors: Waratt Rattasiri, Neal W. Currier, Mathew L. Allen