Patents by Inventor Daniel Hopley

Daniel Hopley 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 a piezoelectric actuator
    Patent number: 7856964
    Abstract: A method for controlling the displacement of a stack of a piezoelectric actuator for use in a fuel injector comprises determining a desired amount of charge (?Q) to be added or removed from the stack. The method further comprises determining an operating parameter of the fuel system and selecting a drive current level (PO, SO) and a drive time (topen, tclose) in accordance with the desired amount of charge (?Q) and the operating parameter, and driving the drive current through the stack for the drive time (topen, tclose) in order to add or remove the desired amount of charge (?Q).
    Type: Grant
    Filed: May 21, 2007
    Date of Patent: December 28, 2010
    Assignee: Delphi Technologies Holding S.arl
    Inventors: Martin Sykes, Joseph Walsh, Daniel Hopley, Peter Griffin
  • Method of controlling a piezoelectric actuator
    Publication number: 20070290573
    Abstract: A method for controlling the displacement of a stack of a piezoelectric actuator for use in a fuel injector comprises determining a desired amount of charge (?Q) to be added or removed from the stack. The method further comprises determining an operating parameter of the fuel system and selecting a drive current level (PO, SO) and a drive time (topen, tclose) in accordance with the desired amount of charge (?Q) and the operating parameter, and driving the drive current through the stack for the drive time (topen, tclose) in order to add or remove the desired amount of charge (?Q).
    Type: Application
    Filed: May 21, 2007
    Publication date: December 20, 2007
    Inventors: Martin Sykes, Joseph Walsh, Daniel Hopley, Peter Griffin