Patents by Inventor Forrest Liu

Forrest Liu 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).

  • Patent number: 8965639
    Abstract: The disclosure describes a control system for controlling the movement of an implement associated with a machine. The control system includes a speed sensor, a grade control system, an implement position sensor, and a controller. The speed sensor is configured to generate a speed signal indicative of a machine speed. The grade control system is configured to generate a desired implement position signal indicative of a desired implement position. The implement position sensor is configured to generate an implement position signal indicative of a position of the implement. The controller is configured to generate a machine control command to move the implement as a function of the speed signal, the desired implement position signal, and the implement position signal.
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: February 24, 2015
    Assignee: Caterpillar Inc.
    Inventors: Forrest Liu, William L. Ostler
  • Patent number: 8948978
    Abstract: The disclosure describes a control system for controlling the movement of an implement associated with a machine. The control system includes a load sensor, a grade control system, an implement position sensor, and a controller. The load sensor is configured to generate a load signal indicative of a loading condition of the implement. The grade control system is configured to generate a desired implement position signal indicative of a desired implement position. The implement position sensor is configured to generate an implement position signal indicative of a position of the implement. The controller is configured to generate a machine control command to move the implement as a function of the load signal, the desired implement position signal, and the implement position signal.
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: February 3, 2015
    Assignee: Caterpillar Inc.
    Inventors: Forrest Liu, William L. Ostler
  • Patent number: 8948977
    Abstract: A system for controlling an implement of a machine is disclosed. The system may have a machine velocity sensor that senses an actual machine velocity and a targeted machine velocity sensor that senses a targeted machine velocity. The system may also have a controller, and an actuator configured to move an implement responsive to commands received from the controller by an actuator controller. The controller may be configured to receive the actual machine velocity from the machine velocity sensor, receive the targeted machine velocity from the targeted machine velocity sensor, compare the actual machine velocity to the targeted machine velocity, and send a command to the actuator controller to shake the implement based on the comparison of the actual machine velocity to the targeted machine velocity.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: February 3, 2015
    Assignee: Caterpillar Inc.
    Inventors: Forrest Liu, William Ostler
  • Publication number: 20140019012
    Abstract: The disclosure describes a control system for controlling the movement of an implement associated with a machine. The control system includes a speed sensor, a grade control system, an implement position sensor, and a controller. The speed sensor is configured to generate a speed signal indicative of a machine speed. The grade control system is configured to generate a desired implement position signal indicative of a desired implement position. The implement position sensor is configured to generate an implement position signal indicative of a position of the implement. The controller is configured to generate a machine control command to move the implement as a function of the speed signal, the desired implement position signal, and the implement position signal.
    Type: Application
    Filed: July 10, 2012
    Publication date: January 16, 2014
    Applicant: Caterpillar Inc.
    Inventors: Forrest Liu, William L. Ostler
  • Publication number: 20140019013
    Abstract: The disclosure describes a control system for controlling the movement of an implement associated with a machine. The control system includes a load sensor, a grade control system, an implement position sensor, and a controller. The load sensor is configured to generate a load signal indicative of a loading condition of the implement. The grade control system is configured to generate a desired implement position signal indicative of a desired implement position. The implement position sensor is configured to generate an implement position signal indicative of a position of the implement. The controller is configured to generate a machine control command to move the implement as a function of the load signal, the desired implement position signal, and the implement position signal.
    Type: Application
    Filed: July 10, 2012
    Publication date: January 16, 2014
    Applicant: Caterpillar Inc.
    Inventors: Forrest Liu, William L. Ostler
  • Publication number: 20130173122
    Abstract: A system for controlling an implement of a machine is disclosed. The system may have a machine velocity sensor that senses an actual machine velocity and a targeted machine velocity sensor that senses a targeted machine velocity. The system may also have a controller, and an actuator configured to move an implement responsive to commands received from the controller by an actuator controller. The controller may be configured to receive the actual machine velocity from the machine velocity sensor, receive the targeted machine velocity from the targeted machine velocity sensor, compare the actual machine velocity to the targeted machine velocity, and send a command to the actuator controller to shake the implement based on the comparison of the actual machine velocity to the targeted machine velocity.
    Type: Application
    Filed: December 28, 2011
    Publication date: July 4, 2013
    Inventors: Forrest Liu, William Ostler