Patents by Inventor David Ketcher

David Ketcher 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).

  • Diesel aftertreatment systems
    Publication number: 20050217247
    Abstract: A method for improving NOx conversion efficiency of a NOx-reducing catalyst by determining an accurate amount of reductant required is presented. The method includes calculating an initial reductant injection amount based on a steady state amount of NOx in the engine feedgas and adjusting the initial amount to compensate for transient Nox emissions. The compensation is initiated in response to an engine transient, such as impending acceleration or deceleration This method further results in improved vehicle fuel economy.
    Type: Application
    Filed: April 21, 2005
    Publication date: October 6, 2005
    Inventors: Paul Simpson, David Ketcher
  • Diesel aftertreatment systems
    Publication number: 20050066652
    Abstract: A method for improving NOx conversion efficiency of a Nox-reducing catalyst by determining an accurate amount of reductant required is presented. The method includes calculating an initial reductant injection amount based on a steady state amount of NOx in the engine feedgas and adjusting the initial amount to compensate for transient NOx emissions. The compensation is initiated in response to an engine transient, such as impending acceleration or deceleration. This method further results in improved vehicle fuel economy.
    Type: Application
    Filed: September 24, 2004
    Publication date: March 31, 2005
    Inventors: David Ketcher, William Ruona