Patents by Inventor David Gordon Evans

David Gordon Evans 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).

  • Methods and apparatus for hill-holding transmission
    Patent number: 7051859
    Abstract: The hill-holding mechanism of the present invention comprises an apparatus and methodology for actuating a transmission control element to prevent the output shaft of an automatic transmission in a hybrid vehicle from rotating under certain predetermined circumstances.
    Type: Grant
    Filed: August 27, 2002
    Date of Patent: May 30, 2006
    Assignee: General Motors Corporation
    Inventors: James R. Yurgil, David Gordon Evans
  • Methods and apparatus for hill-holding transmission
    Publication number: 20040043859
    Abstract: The hill-holding mechanism of the present invention comprises an apparatus and methodology for actuating a transmission control element to prevent the output shaft of an automatic transmission in a hybrid vehicle from rotating under certain predetermined circumstances.
    Type: Application
    Filed: August 27, 2002
    Publication date: March 4, 2004
    Inventors: James R. Yurgil, David Gordon Evans
  • Surge suppression control for a motor vehicle drivetrain
    Patent number: 6629025
    Abstract: An improved surge suppression control for a motor vehicle drivetrain detects and suppresses drivetrain oscillation in a predetermined range of frequencies centered on an estimate of the natural frequency of the drivetrain. The drivetrain natural frequency is determined based on the current speed ratio of the vehicle transmission and empirically determined vehicle characteristics, and is used to define the center frequency of a band-pass filter responsive to engine speed. The filter output represents the AC component of the engine speed in a range of frequencies centered on the driveline natural frequency, and such component is differentiated to form an acceleration component in phase synchronism with the torque causing the detected resonance.
    Type: Grant
    Filed: January 3, 2002
    Date of Patent: September 30, 2003
    Assignees: General Motors Corporation, Delphi Technologies Inc.
    Inventors: David Gordon Evans, James J. Paris, Gerald Thomas Fattic
  • SURGE SUPPRESSION CONTROL FOR A MOTOR VEHICLE DRIVETRAIN
    Publication number: 20030125850
    Abstract: An improved surge suppression control for a motor vehicle drivetrain detects and suppresses drivetrain oscillation in a predetermined range of frequencies centered on an estimate of the natural frequency of the drivetrain. The drivetrain natural frequency is determined based on the current speed ratio of the vehicle transmission and empirically determined vehicle characteristics, and is used to define the center frequency of a band-pass filter responsive to engine speed. The filter output represents the AC component of the engine speed in a range of frequencies centered on the driveline natural frequency, and such component is differentiated to form an acceleration component in phase synchronism with the torque causing the detected resonance.
    Type: Application
    Filed: January 3, 2002
    Publication date: July 3, 2003
    Inventors: David Gordon Evans, James J. Paris, Gerald Thomas Fattic
  • Powertrain with integrated motor generator
    Patent number: 6208036
    Abstract: A hybrid powertrain has an internal combustion engine, a power transmission and an electric drive. The electric drive includes a stator secured in the housing of the power transmission and a rotor secured to the outer periphery of the torque converter of the power transmission. Both the rotor and the impeller of the torque converter are directly connected with the engine. A torque converter clutch is disposed for selective engagement between the impeller and turbine of the torque converter.
    Type: Grant
    Filed: October 7, 1999
    Date of Patent: March 27, 2001
    Assignee: General Motors Corporation
    Inventors: David Gordon Evans, Keith D. Van Maanen