Patents by Inventor Susumu Yamagata

Susumu Yamagata 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).

  • Fixation detecting apparatus to prevent audible sound from emanating from oil pump during oil pump operation state determination
    Patent number: 11143182
    Abstract: An oil pump fixation detecting apparatus includes an oil pump, a discharge state switching unit, a target oil pressure setting unit, a pressure regulator, and a fixation determining unit. The discharge state switching unit performs control of switching a discharge state of the oil pump from a full-discharge state to a partial-discharge state. The fixation determining unit determines that the oil pump is not fixed in the full-discharge state in a case where oil pressure in a high-pressure oil passage has dropped by a predetermined value or more within a predetermined time, and determines that the oil pump is fixed in the full-discharge state in a case where the oil pressure in the high-pressure oil passage does not drop by the predetermined value or more.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: October 12, 2021
    Assignee: SUBARU CORPORATION
    Inventors: Yoshitaka Takahashi, Susumu Yamagata, Sho Yoshida, Katsuyuki Namiki, Kyohei Sugiyama
  • OIL PUMP FIXATION DETECTING APPARATUS AND OIL PUMP FIXATION DETECTING METHOD
    Publication number: 20190301457
    Abstract: An oil pump fixation detecting apparatus includes an oil pump, a discharge state switching unit, a target oil pressure setting unit, a pressure regulator, and a fixation determining unit. The discharge state switching unit performs control of switching a discharge state of the oil pump from a full-discharge state to a partial-discharge state. The fixation determining unit determines that the oil pump is not fixed in the full-discharge state in a case where oil pressure in a high-pressure oil passage has dropped by a predetermined value or more within a predetermined time, and determines that the oil pump is fixed in the full-discharge state in a case where the oil pressure in the high-pressure oil passage does not drop by the predetermined value or more.
    Type: Application
    Filed: December 4, 2018
    Publication date: October 3, 2019
    Inventors: Yoshitaka TAKAHASHI, Susumu Yamagata, Sho Yoshida, Katsuyuki Namiki, Kyohei Sugiyama