Patents by Inventor Lifei Yu

Lifei Yu 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 system for electrohydraulic valve control
    Patent number: 6286412
    Abstract: An electrohydraulic valve control system which enables simultaneous flow and pressure control for operating an implement or other work element associated with a work machine through the use of a single control valve design, the present control system comparing the actual valve output flow rate of the hydraulic fluid flowing through the valve to a desired valve output flow rate and thereafter modifying the input flow rate to the valve based upon the difference between the actual valve output flow rate and the desired valve output flow rate. The desired valve output flow rate is determined based upon the actual load pressure being exerted against the implement or work element and the operator input signal generated by the operator upon activation of an operator input control mechanism used to control the operation of the implement or work element.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: September 11, 2001
    Assignee: Caterpillar Inc.
    Inventors: Noah D. Manring, Lifei Yu