Patents by Inventor Ando Takeki

Ando Takeki 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).

  • Fault detecting system for a control system
    Patent number: 4171505
    Abstract: In a speed feedback control system wherein a speed command signal and a speed feedback signal are compared and wherein the deviation between these signals is entered into a speed control unit, the speed signal is differentiated to apply speed damping in order to suppress the oscillations of the control system. In this case, while the speed command and the actual speed make a great difference transiently, the speed command is approximate to the sum between the speed feedback signal and the damping signal even transiently. Therefore, the speed command signal is compared with the sum between the speed feedback signal and the damping signal, and the fault of the speed control system is detected upon the fact that the deviation has exceeded a predetermined value.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: October 16, 1979
    Assignee: Hitachi, Ltd.
    Inventors: Seiya Shima, Hiroaki Kuroha, Ando Takeki, Hiromi Inaba, Toshiaki Kurosawa, Mutsuhiro Terunuma, Yoshio Sakai