Patents by Inventor David L. St. Pierre

David L. St. Pierre 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 of crank signal disturbance compensation
    Patent number: 7607415
    Abstract: An engine system that compensates for disturbances in a crankshaft signal is provided. The system includes: an error module that computes an error between an ideal period and an actual period of a crankshaft signal; a correction factor module that determines a correction factor based on the error; and a compensation module that applies the correction factor to the actual period of the crankshaft signal.
    Type: Grant
    Filed: October 3, 2006
    Date of Patent: October 27, 2009
    Assignee: GM Global Technology Operations, Inc.
    Inventors: David S. Mathews, Tameem K. Assaf, Ronald J. Kubani, David L. St. Pierre, Yong Xu
  • Misfire detection apparatus for internal combustion engine based on piston speed
    Patent number: 7353803
    Abstract: The present invention generally includes a method of detecting a misfire in an internal combustion engine. The method includes detecting a first engine speed at a first crankshaft position that corresponds to about a top dead center compression position of a first piston within a first cylinder and detecting a second engine speed at a second crankshaft position that corresponds to about a position subsequent to the top dead center compression position. The method determines whether the misfire occurred in the first cylinder based on the first engine speed and the second engine speed. The method provides an improved signal to noise ratio for engine misfire detection.
    Type: Grant
    Filed: March 28, 2006
    Date of Patent: April 8, 2008
    Assignee: GM Global Technology Operations, Inc.
    Inventors: David S. Mathews, Tameem K. Assaf, David L. St. Pierre
  • Method of crank signal disturbance compensation
    Publication number: 20080078361
    Abstract: An engine system that compensates for disturbances in a crankshaft signal is provided. The system includes: an error module that computes an error between an ideal period and an actual period of a crankshaft signal; a correction factor module that determines a correction factor based on the error; and a compensation module that applies the correction factor to the actual period of the crankshaft signal.
    Type: Application
    Filed: October 3, 2006
    Publication date: April 3, 2008
    Inventors: David S. Matthews, Tameem K. Assaf, Ronald J. Kubani, David L. St. Pierre, Yong Xu