Patents by Inventor Madhusudhan Chellappa

Madhusudhan Chellappa 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).

  • Method and apparatus for adaptive feedback control of an excess air ratio in a compression ignition natural gas engine
    Patent number: 8527186
    Abstract: A computer-implemented method is used to correct deviations between a predicted gas excess air ratio and a calculated excess air ratio in a dual fuel engine or other gas fueled compression ignition engine. The method includes determining gas excess air ratio for the engine based at least in part on at least one detected current operating parameter and calculating a predicted exhaust gas oxygen concentration engine based on the predicted gas excess air ratio. A time based filtered predicted exhaust gas oxygen concentration value may then be calculated and compared to a time-based filtered measured exhaust gas oxygen concentration value. The resultant oxygen concentration deviation value may be used to generate a corrected predicted gas excess air ratio.
    Type: Grant
    Filed: September 8, 2010
    Date of Patent: September 3, 2013
    Assignee: Clean Air Power, Inc.
    Inventors: Hoi Ching Wong, Madhusudhan Chellappa, Carlos Gamez
  • METHOD AND APPARATUS FOR ADAPTIVE FEEDBACK CONTROL OF AN EXCESS AIR RATIO IN A COMPRESSION IGNITION NATURAL GAS ENGINE
    Publication number: 20120055457
    Abstract: A computer-implemented method is used to correct deviations between a predicted gas excess air ratio and a calculated excess air ratio in a dual fuel engine or other gas fueled compression ignition engine. The method includes determining gas excess air ratio for the engine based at least in part on at least one detected current operating parameter and calculating a predicted exhaust gas oxygen concentration engine based on the predicted gas excess air ratio. A time based filtered predicted exhaust gas oxygen concentration value may then be calculated and compared to a time-based filtered measured exhaust gas oxygen concentration value. The resultant oxygen concentration deviation value may be used to generate a corrected predicted gas excess air ratio.
    Type: Application
    Filed: September 8, 2010
    Publication date: March 8, 2012
    Applicant: Clean Air Power, Inc.
    Inventors: Hoi Ching Wong, Madhusudhan Chellappa, Carlos Gamez