Patents by Inventor Takehiro Ishigaki

Takehiro Ishigaki 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).

  • Turbine bypass control apparatus and turbine bypass control method
    Patent number: 8160799
    Abstract: A turbine bypass control method includes: a high-pressure side pressure controller configured to output a first operation amount signal corresponding to a valve opening; a low-pressure side pressure controller configured to output a second operation amount signal corresponding to a valve opening; a high value selector configured to output as a high value operation amount signal, one of the first operation amount signal and the second operation amount signal which indicates a larger opening; a first signal switching unit configured to receive the high value operation amount signal and the second operation amount signal and output a first bypass valve operation amount signal; a second signal switching unit configured to receive the high value operation amount signal and the first operation amount signal and output a second bypass valve operation amount signal; and a rapid opening controller.
    Type: Grant
    Filed: February 4, 2009
    Date of Patent: April 17, 2012
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Naohiko Ishibashi, Takehiro Ishigaki, Toshikazu Kondo
  • TURBINE BYPASS CONTROL APPARATUS AND TURBINE BYPASS CONTROL METHOD
    Publication number: 20090204305
    Abstract: A turbine bypass control method includes: a high-pressure side pressure controller configured to output a first operation amount signal corresponding to a valve opening; a low-pressure side pressure controller configured to output a second operation amount signal corresponding to a valve opening; a high value selector configured to output as a high value operation amount signal, one of the first operation amount signal and the second operation amount signal which indicates a larger opening; a first signal switching unit configured to receive the high value operation amount signal and the second operation amount signal and output a first bypass valve operation amount signal; a second signal switching unit configured to receive the high value operation amount signal and the first operation amount signal and output a second bypass valve operation amount signal; and a rapid opening controller.
    Type: Application
    Filed: February 4, 2009
    Publication date: August 13, 2009
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Naohiko ISHIBASHI, Takehiro ISHIGAKI, Toshikazu KONDO