Patents by Inventor Yukiyoshi Tani

Yukiyoshi Tani 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).

  • Servo valve control apparatus
    Patent number: 5214913
    Abstract: A method of and apparatus for controlling a triple-coil servo valve arranged having a tripled control system each of which is composed of components of a coil, a servo amplifier and a controller, the method of and the apparatus for controlling the triple servo valve including means for specifying the abnormality of each of the components, servo amplifier output separation means, means capable of desirably combining the components and means for compensating the servo amplifier. If two control systems of the tripled control system are faulty in such a manner that at least one coil, at least one servo amplifier or at least one controller is abnormal, the triple-coil servo is operated by combining the normal components or by compensating the servo amplifier so that the continuation of the operation of the plant is enabled.
    Type: Grant
    Filed: May 22, 1991
    Date of Patent: June 1, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Yukiyoshi Tani, Sadao Yanada, Takeshi Iwamiya, Takumi Kawai, Tadahiko Iijima