Patents by Inventor Larry O. Ezell

Larry O. Ezell 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).

  • Electrohydraulic and hydromechanical valve system for dual-piston stroke controller
    Patent number: 5046397
    Abstract: An electrohydraulic system for control of a variable output pump includes a microprocessor-based controller receiving inputs from condition sensors coupled to the pump and command inputs from a remote master controller. The controller supplies outputs to an electrohydraulic valve for metering hydraulic fluid to a pump control port and thereby controlling pump operation in any one of a number of preselected and prestored pump control modes. A hydromechanical valve is connected in parallel with the electrohydraulic valve for controlling pump operation in the event of electrical malfunction or failure. Circuitry connected between the pump condition sensors and the control computer prevents aliasing errors due to mismatch between the computer sampling frequency and pump speed.
    Type: Grant
    Filed: February 20, 1990
    Date of Patent: September 10, 1991
    Assignee: Vickers, Incorporated
    Inventors: Larry O. Ezell, John Schmid, Peter Tovey
  • Electrohydraulic fluid control system for variable displacement pump
    Patent number: 4934143
    Abstract: An electrohydraulic system for control of a variable output pump includes a microprocessor-based controller receiving inputs from condition sensors coupled to the pump and command inputs from a remote master controller. The controller supplies outputs to an electrohydraulic valve for metering hydraulic fluid to a pump control port and thereby controlling pump operation in any one of a number of preselected and prestored pump control modes. A hydromechanical valve is connected in parallel with the electrohydraulic valve for controlling pump operation in the event of electrical malfunction or failure. Circuitry connected between the pump condition sensors and the control computer prevents aliasing errors due to mismatch between the computer sampling frequency and pump speed.
    Type: Grant
    Filed: February 9, 1989
    Date of Patent: June 19, 1990
    Assignee: Vickers, Incorporated
    Inventors: Larry O. Ezell, John Schmid, Peter Tovey
  • Failsafe electrohydraulic control system for variable displacement pump
    Patent number: 4823552
    Abstract: An electrohydraulic system for control of a variable output pump includes a microprocessor-based controller receiving inputs from condition sensors coupled to the pump and command inputs from a remote master controller. The controller supplies outputs to an electrohydraulic valve for metering hydraulic fluid to a pump control port and thereby controlling pump operation in any one of a number of preselected and prestored pump control modes. A hydromechanical valve is connected in parallel with the electrohydraulic valve for controlling pump operation in the event of electrical malfunction or failure. Circuitry connected between the pump condition sensors and the control computer prevents aliasing errors due to mismatch between the computer sampling frequency and pump speed. A pump torque sensor measures pump input shaft torque.
    Type: Grant
    Filed: April 29, 1987
    Date of Patent: April 25, 1989
    Assignee: Vickers, Incorporated
    Inventors: Larry O. Ezell, John Schmid, Peter Tovey