Patents by Inventor David H Vu

David H Vu 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 learning engaged positions and a neutral position of a synchronizer actuator fork of a dual clutch transmission
    Patent number: 8831845
    Abstract: A method of controlling a dual clutch transmission includes repeatedly moving a synchronizer into interlocking engagement with a first gear with an actuator fork, and repeatedly sensing a position of the actuator fork for each occurrence that the actuator fork moves the synchronizer into the interlocking engagement with the first gear. The sensed positions of the actuator fork are averaged to define a first engaged position of the actuator fork for engaging the first gear. A second engaged position at which the actuator fork couples the synchronizer to a second gear may be determined in the same manner. A neutral position may be determined by identifying the axial locations of peak acceleration of the actuator fork while moving between the first engaged position and the second engaged position. The identified axial locations are averaged to define the neutral position of the actuator fork.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: September 9, 2014
    Assignee: GM Global Technology Operations LLC
    Inventors: Xuefeng Tim Tao, Matthew Kempeinen, Christopher Jay Weingartz, Jeryl McIver, David H Vu