Patents by Inventor Kristin L Day

Kristin L Day 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 to prioritize input acceleration and clutch synchronization performance in neutral for a hybrid powertrain system
    Patent number: 8092339
    Abstract: A method for controlling a powertrain includes operating a transmission in a neutral operating range state, monitoring commands affecting an input speed, monitoring a tracked clutch slip speed, determining constraints on an input acceleration based upon the commands, determining a clutch slip acceleration profile based upon the constraints on the input acceleration, determining an input acceleration profile based upon the clutch slip acceleration profile, and controlling the powertrain based upon the clutch slip acceleration profile and the input acceleration profile.
    Type: Grant
    Filed: October 13, 2008
    Date of Patent: January 10, 2012
    Assignees: GM Global Technology Operations LLC, Daimler AG, Chrysler LLC, Bayerische Motoren Werke Aktiengesellschaft
    Inventors: Anthony H. Heap, Lawrence A. Kaminsky, Jy-Jen F. Sah, Kristin L Day
  • Method and apparatus to control hydraulic pressure for component lubrication in an electro-mechanical transmission
    Patent number: 7985154
    Abstract: A method for controlling hydraulic line pressure for component lubrication in a transmission includes monitoring a speed of an engine and an electric machine, determining a minimum line pressure required to lubricate the engine based upon the speed of the engine, determining a minimum line pressure required to lubricate the electric machine based upon the speed of the electric machine, controlling a minimum line pressure of a hydraulic control system to at least satisfy a larger value of the minimum line pressures.
    Type: Grant
    Filed: October 8, 2008
    Date of Patent: July 26, 2011
    Assignee: GM Global Technology Operations LLC
    Inventors: Kristin L Day, Jy-Jen F. Sah
  • METHOD AND APPARATUS TO PRIORITIZE INPUT ACCELERATION AND CLUTCH SYNCHRONIZATION PERFORMANCE IN NEUTRAL FOR A HYBRID POWERTRAIN SYSTEM
    Publication number: 20090118082
    Abstract: A method for controlling a powertrain includes operating a transmission in a neutral operating range state, monitoring commands affecting an input speed, monitoring a tracked clutch slip speed, determining constraints on an input acceleration based upon the commands, determining a clutch slip acceleration profile based upon the constraints on the input acceleration, determining an input acceleration profile based upon the clutch slip acceleration profile, and controlling the powertrain based upon the clutch slip acceleration profile and the input acceleration profile.
    Type: Application
    Filed: October 13, 2008
    Publication date: May 7, 2009
    Applicants: GM GLOBAL TECHNOLOGY OPERATIONS, INC., Daimler AG, Chrysler LLC, Bayerishe Motoren Werke Aktiengesellschaft
    Inventors: Anthony H. Heap, Lawrence A. Kaminsky, Jy-Jen F. Sah, Kristin L. Day
  • METHOD AND APPARATUS TO CONTROL HYDRAULIC PRESSURE FOR COMPONENT LUBRICATION IN AN ELECTRO-MECHANICAL TRANSMISSION
    Publication number: 20090111637
    Abstract: A method for controlling hydraulic line pressure for component lubrication in a transmission includes monitoring a speed of an engine and an electric machine, determining a minimum line pressure required to lubricate the engine based upon the speed of the engine, determining a minimum line pressure required to lubricate the electric machine based upon the speed of the electric machine, controlling a minimum line pressure of a hydraulic control system to at least satisfy a larger value of the minimum line pressures.
    Type: Application
    Filed: October 8, 2008
    Publication date: April 30, 2009
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Kristin L. Day, Jy-Jen F. Sah