Patents by Inventor Julie A Stuart

Julie A Stuart 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).

  • Gasoline fuel cell power system transient control
    Patent number: 7386375
    Abstract: A reformer fuel feed stream in fuel cell power system is catalytically reacted into a reformate stream for a fuel cell stack by adjusting fuel supply throughput according to a predefined throughput ramp when a time derivative and the current demand for the fuel cell deviates from zero by more than an acceleration threshold value. The fuel cell power system is of special value when deployed on a vehicle where the load command is derived from the accelerator pedal of the vehicle.
    Type: Grant
    Filed: September 7, 2004
    Date of Patent: June 10, 2008
    Assignee: General Motors Corporation
    Inventors: Martin M Hoch, Julie A Stuart
  • Diagnostic system for identifying fuel injector failure in a fuel cell system
    Patent number: 6755077
    Abstract: A diagnostic system and method identifies fuel injector failure in a fuel cell system including a fuel processor and a fuel source. A fuel injector supplies fuel from the fuel source to the fuel processor. A pressure sensor generates a pressure signal based on pressure between the fuel source and the fuel injector. A fuel injector diagnostic identifies fuel injector failure based on the pressure signal. The fuel injector diagnostic includes a moving window tracker that tracks the pressure signal over a moving window. The fuel injector diagnostic further includes a standard deviation or variance calculator that generates a standard deviation or variance based on the pressure signal in the moving window.
    Type: Grant
    Filed: June 6, 2002
    Date of Patent: June 29, 2004
    Assignee: General Motors Corporation
    Inventors: Bruce J. Clingerman, Donald H. Keskula, Julie A. Stuart
  • Diagnostic system for identifying fuel injector failure in a fuel cell system
    Publication number: 20030226399
    Abstract: A diagnostic system and method identifies fuel injector failure in a fuel cell system including a fuel processor and a fuel source. A fuel injector supplies fuel from the fuel source to the fuel processor. A pressure sensor generates a pressure signal based on pressure between the fuel source and the fuel injector. A fuel injector diagnostic identifies fuel injector failure based on the pressure signal. The fuel injector diagnostic includes a moving window tracker that tracks the pressure signal over a moving window. The fuel injector diagnostic further includes a standard deviation or variance calculator that generates a standard deviation or variance based on the pressure signal in the moving window.
    Type: Application
    Filed: June 6, 2002
    Publication date: December 11, 2003
    Inventors: Bruce J. Clingerman, Donald H. Keskula, Julie A. Stuart