Patents by Inventor Kotomi Fujinaga

Kotomi Fujinaga 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).

  • Fuel cell system, non-transitory storage medium and control method for fuel cell system
    Patent number: 11705567
    Abstract: A fuel cell system has a first boost converter of a fuel cell, a second boost converter of a secondary battery, and a control unit. Output sides of the first boost converter and the second boost converter are connected so as to be the same potential. The control unit is configured to, when detecting failure of the second boost converter, cause input and output sides of the second boost converter to conduct, estimate an open circuit voltage of the secondary battery based on a state of charge, and execute electric power consumption by an accessory that operates by electric power supplied from the fuel cell when determining that the first boost converter is not able to boost the output voltage of the fuel cell to the open circuit voltage, and stops the electric power consumption by the accessory when determining that the first boost converter is able to boost.
    Type: Grant
    Filed: March 11, 2021
    Date of Patent: July 18, 2023
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Ryosuke Oya, Kotomi Fujinaga, Shinobu Otsuka
  • FUEL CELL SYSTEM, NON-TRANSITORY STORAGE MEDIUM AND CONTROL METHOD FOR FUEL CELL SYSTEM
    Publication number: 20210351424
    Abstract: A fuel cell system has a first boost converter of a fuel cell, a second boost converter of a secondary battery, and a control unit. Output sides of the first boost converter and the second boost converter are connected so as to be the same potential. The control unit is configured to, when detecting failure of the second boost converter, cause input and output sides of the second boost converter to conduct, estimate an open circuit voltage of the secondary battery based on a state of charge, and execute electric power consumption by an accessory that operates by electric power supplied from the fuel cell when determining that the first boost converter is not able to boost the output voltage of the fuel cell to the open circuit voltage, and stops the electric power consumption by the accessory when determining that the first boost converter is able to boost.
    Type: Application
    Filed: March 11, 2021
    Publication date: November 11, 2021
    Inventors: Ryosuke Oya, Kotomi Fujinaga, Shinobu Otsuka