Patents by Inventor Steven J. Shepherd

Steven J. Shepherd 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 controlling an auxiliary pump for a transmission
    Patent number: 8146690
    Abstract: A method of operating an auxiliary pump for an electrically variable transmission includes purging the auxiliary pump when an auxiliary pump temperature is below a minimum operating temperature and above a minimum purge temperature. The auxiliary pump fluid temperature and the minimum purge temperature are determined based upon the transmission fluid temperature and the ambient temperature.
    Type: Grant
    Filed: May 29, 2009
    Date of Patent: April 3, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: Goro Tamai, Jy-Jen F. Sah, Eric S. Tryon, Scott A Miller, Steven J. Shepherd
  • Method to autostart an internal combustion engine in a hybrid powertrain system
    Patent number: 8099203
    Abstract: Internal combustion engine autostarting includes selecting from among several autostart processes in accordance with desired input torque from the engine to the transmission, cranking the engine, and fueling the engine during the engine cranking based upon the selected engine autostart process.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: January 17, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: Jon C. Miller, Kelly T. Jozefowicz, Mark D. Carr, Steven J. Shepherd
  • Engine coolant temperature estimation system
    Patent number: 7921705
    Abstract: An engine coolant temperature estimation system comprises a coolant temperature estimation module and a coolant monitoring module. The coolant estimation module estimates an engine coolant temperature based on at least one of a mass air flow, a vehicle speed, and an ambient temperature. The coolant monitoring module selectively operates an engine based on the estimated engine coolant temperature.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: April 12, 2011
    Inventors: Wajdi B. Hamama, Jon C. Miller, Igor Anilovich, John W. Siekkinen, Steven J. Shepherd, Robert S. Wickman, Roberto De Paula
  • METHOD OF CONTROLLING AN AUXILIARY PUMP FOR A TRANSMISSION
    Publication number: 20100303636
    Abstract: A method of operating an auxiliary pump for an electrically variable transmission includes purging the auxiliary pump when an auxiliary pump temperature is below a minimum operating temperature and above a minimum purge temperature. The auxiliary pump fluid temperature and the minimum purge temperature are determined based upon the transmission fluid temperature and the ambient temperature.
    Type: Application
    Filed: May 29, 2009
    Publication date: December 2, 2010
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Goro Tamai, Jy-Jen F. Sah, Eric S. Tryon, Scott A. Miller, Steven J. Shepherd
  • ENGINE COOLANT TEMPERATURE ESTIMATION SYSTEM
    Publication number: 20100058848
    Abstract: An engine coolant temperature estimation system comprises a coolant temperature estimation module and a coolant monitoring module. The coolant estimation module estimates an engine coolant temperature based on at least one of a mass air flow, a vehicle speed, and an ambient temperature. The coolant monitoring module selectively operates an engine based on the estimated engine coolant temperature.
    Type: Application
    Filed: October 2, 2008
    Publication date: March 11, 2010
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Wajdi B. Hamama, Jon C. Miller, Igor Anilovich, John W. Siekkinen, Steven J. Shepherd, Robert S. Wickman, Roberto De Paula
  • METHOD TO AUTOSTART AN INTERNAL COMBUSTION ENGINE IN A HYBRID POWERTRAIN SYSTEM
    Publication number: 20090299586
    Abstract: Internal combustion engine autostarting includes selecting from among several autostart processes in accordance with desired input torque from the engine to the transmission, cranking the engine, and fueling the engine during the engine cranking based upon the selected engine autostart process.
    Type: Application
    Filed: May 27, 2008
    Publication date: December 3, 2009
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Jon C. Miller, Kelly T. Jozefowicz, Mark D. Carr, Steven J. Shepherd