Patents by Inventor Ryushiro Tokunaga

Ryushiro Tokunaga 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).

  • Secondary battery system and SOC estimation method for secondary battery
    Patent number: 11635470
    Abstract: An ECU is configured to execute SOC estimation control for estimating an SOC of a battery. The ECU obtains “first voltage” indicating an OCV of the battery in the SOC estimation control. The ECU controls an engine and a PCU such that the battery is charged with an amount of electric power equal to or larger than a prescribed amount, when the first voltage is within a voltage range where hysteresis occurs. The ECU obtains “second voltage” indicating an OCV of the charged battery, and estimates the SOC of the battery from the second voltage.
    Type: Grant
    Filed: September 4, 2019
    Date of Patent: April 25, 2023
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, PANASONIC HOLDINGS CORPORATION
    Inventors: Tatsuya Koga, Hiroki Nagai, Mina Nishigaki, Daisuke Nishide, Ryushiro Tokunaga
  • SECONDARY BATTERY SYSTEM AND SOC ESTIMATION METHOD FOR SECONDARY BATTERY
    Publication number: 20200072911
    Abstract: An ECU is configured to execute SOC estimation control for estimating an SOC of a battery. The ECU obtains “first voltage” indicating an OCV of the battery in the SOC estimation control. The ECU controls an engine and a PCU such that the battery is charged with an amount of electric power equal to or larger than a prescribed amount, when the first voltage is within a voltage range where hysteresis occurs. The ECU obtains “second voltage” indicating an OCV of the charged battery, and estimates the SOC of the battery from the second voltage.
    Type: Application
    Filed: September 4, 2019
    Publication date: March 5, 2020
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, Panasonic Corporation
    Inventors: Tatsuya KOGA, Hiroki Nagai, Mina Nishigaki, Daisuke Nishide, Ryushiro Tokunaga