Patents by Inventor Kohji Tachibana

Kohji Tachibana 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).

  • Process control apparatus and method for adjustment of operating parameters of controller of the process control apparatus
    Patent number: 5245528
    Abstract: A process control apparatus and a process control system for observing the waveform of the deviation between a set point which controls the process in a control loop and the process controlled variable transmitted from the process so that the operating parameters are adjusted in accordance with a predetermined adjustment rule by using the deviation based upon the absolute value of a wave for every half cycle of the wave. Therefore, even if the process controlled variable is influenced, the area of the wave cannot be changed significantly. As a result, the operating parameters can be adjusted correctly, causing the process controlled variable to quickly coincide with the set point.
    Type: Grant
    Filed: March 20, 1990
    Date of Patent: September 14, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Tadayoshi Saito, Kohji Tachibana, Susumu Takahashi, Nobuyuki Yokokawa, Masahide Nomura, Hiroshi Matsumoto, Makoto Shimoda, Hisanori Miyagaki, Eiji Tohyama