Patents by Inventor R. Carl Wilbur

R. Carl Wilbur 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 for controlling the actuation of a hydraulic cylinder
    Patent number: 6257118
    Abstract: An apparatus controllably moves a moveable element within a hydraulic motor. A lever device establishes an operator command signal indicative of a desired velocity and direction of movement of the moveable element. A position sensor senses the position of the moveable element and produce a position signal. An electronic controller receives the operator command signal and position signal, determines the actual velocity of the moveable element, and determines a limit value in response to the actual velocity of the moveable element. Additionally, the controller compares the operator signal magnitude to the limit value and produces a flow control signal in response to the comparison. An electrohydraulic controller receives the flow control signal and responsively controls the movement of the moveable element.
    Type: Grant
    Filed: May 17, 1999
    Date of Patent: July 10, 2001
    Assignee: Caterpillar Inc.
    Inventors: R. Carl Wilbur, John D. Duffy, Douglas W. Koehler