Patents by Inventor Toshihiro EGAWA

Toshihiro EGAWA 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).

  • Patent number: 10892503
    Abstract: In a fuel cell system including a fuel cell, an anode gas supply channel, an anode gas discharge channel, an injector, a pressure sensor, and a controller, the controller controls the injector so that the pressure on the downstream side of the injector in the anode gas supply channel and does not become lower than target pressure, closes a discharge valve when the amount of discharged anode gas reaches a target discharge amount, the amount of discharged anode gas estimated based on the amount of decrease in the value of the pressure in a first period of the discharge valve open-period, the first period being a period from the point of time after the injector stops the injection and when variation of the pressure falls within a predetermined range to the point of time when the injector next starts the injection, and increases a ratio of the first period to the drive cycle by controlling, during the discharge valve open-period, at least one of the anode gas supply rate of the injector, the amount of electric po
    Type: Grant
    Filed: July 24, 2018
    Date of Patent: January 12, 2021
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masahiro Okuyoshi, Toshihiro Egawa
  • Patent number: 10490831
    Abstract: It is possible to suppress errors remaining in the measurement by a pressure sensor. A fuel cell system includes a fuel cell, a tank storing fuel gas, a fuel gas supply flow path feeding the fuel gas from the tank to the fuel cell, a first pressure reduction unit reducing pressure of the fuel gas and feeding the fuel gas, a first pressure sensor measuring pressure in the fuel gas supply flow path, a second pressure sensor measuring pressure in the fuel gas supply flow path, a switching valve switching execution and stop of supply of the fuel gas, a correction unit correcting the first pressure sensor based on a second measurement value measured by the second pressure sensor, and a controller controlling the fuel cell system.
    Type: Grant
    Filed: April 19, 2018
    Date of Patent: November 26, 2019
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Toshihiro Egawa, Masahiro Okuyoshi
  • Publication number: 20190288313
    Abstract: Provided is a fuel cell system including: a fuel cell; an anode gas supply device; a pressure sensor; a discharge valve; an estimation unit that estimates an anode gas concentration; and a control unit.
    Type: Application
    Filed: February 27, 2019
    Publication date: September 19, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tetsuya BONO, Toshihiro EGAWA, Masahiro OKUYOSHI
  • Publication number: 20190267642
    Abstract: A plant control system is equipped with a plant, an actuator that controls a state of the plant based on a command value, and an arithmetic device that calculates the command value through the use of state information indicating the state of the plant and that outputs the command value to the actuator. The arithmetic device adopts, as the command value, a value of u obtained by deleting a time differential of y from equations: dy/dt=f(y, u, d, t) and K4×dy/dt=K3×yref?K1×y+K2×(time integral of (yref?y))+K5.
    Type: Application
    Filed: February 26, 2019
    Publication date: August 29, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiro OKUYOSHI, Tetsuya BONO, Toshihiro EGAWA
  • Publication number: 20190267650
    Abstract: A control device includes a target value acquisition portion configured to acquire a target value of amount of control per predetermined computation cycle, a control portion configured to control the control target using the acquired target value, a target smoothing value calculation portion configured to calculate a target smoothing value in which a temporal change in the target value is slowed down, and a state determination portion configured to calculate a first difference that is a difference between the target value and the target smoothing value to determine that the amount of control is in a transient state when the calculated first difference is equal to or more than a predetermined first threshold value and to determine that the amount of control is in a non-transient state when the first difference is smaller than the first threshold value.
    Type: Application
    Filed: February 5, 2019
    Publication date: August 29, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Toshihiro EGAWA, Tetsuya BONO, Masahiro OKUYOSHI
  • Publication number: 20190260049
    Abstract: The power controller starts imposing the current limit when a condition for the current limit is met the condition, the condition being that the fuel cell does not generate to fulfill the requested amount of power generation while the fuel cell generates power at an upper limit of the supply capability of the fuel gas supply unit, and the power controller removes the current limit at a first predetermined increase rate determined when the requested amount of power generation exceeds a predetermined threshold below a rated power generation amount of the fuel cell and at a second increase rate higher than the first increase rate when the requested amount of power generation is the threshold or less, after the condition for the limit is dissolved.
    Type: Application
    Filed: February 14, 2019
    Publication date: August 22, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tetsuya BONO, Toshihiro EGAWA, Masahiro OKUYOSHI
  • Publication number: 20190036140
    Abstract: In a fuel cell system including a fuel cell, an anode gas supply channel, an anode gas discharge channel, an injector, a pressure sensor, and a controller, the controller controls the injector so that the pressure on the downstream side of the injector in the anode gas supply channel and does not become lower than target pressure, closes a discharge valve when the amount of discharged anode gas reaches a target discharge amount, the amount of discharged anode gas estimated based on the amount of decrease in the value of the pressure in a first period of the discharge valve open-period, the first period being a period from the point of time after the injector stops the injection and when variation of the pressure falls within a predetermined range to the point of time when the injector next starts the injection, and increases a ratio of the first period to the drive cycle by controlling, during the discharge valve open-period, at least one of the anode gas supply rate of the injector, the amount of electric po
    Type: Application
    Filed: July 24, 2018
    Publication date: January 31, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiro OKUYOSHI, Toshihiro EGAWA
  • Publication number: 20180366753
    Abstract: A fuel cell system installed in a mobile body comprises; a fuel cell; a gas supply flow path; an injection device provided on the gas supply flow path; a pressure regulating valve configured to be provided more on an upstream side than the injection device on the gas supply flow path, and to autonomously perform an opening/closing operation in accordance with a difference between pressure between the pressure regulating valve and the injection device on the gas supply flow path and pressure on an upstream side of the pressure regulating valve; and a control unit configured to control injection of the reaction gas by the injection device. The control unit calculates an injection interval of the injection device based on an upper limit operation count of the pressure regulating valve set in advance with respect to a predetermined traveling distance of the mobile body.
    Type: Application
    Filed: June 11, 2018
    Publication date: December 20, 2018
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiro OKUYOSHI, Toshihiro EGAWA
  • Publication number: 20180331375
    Abstract: It is possible to suppress errors remaining in the measurement by a pressure sensor. A fuel cell system includes a fuel cell, a tank storing fuel gas, a fuel gas supply flow path feeding the fuel gas from the tank to the fuel cell, a first pressure reduction unit reducing pressure of the fuel gas and feeding the fuel gas, a first pressure sensor measuring pressure in the fuel gas supply flow path, a second pressure sensor measuring pressure in the fuel gas supply flow path, a switching valve switching execution and stop of supply of the fuel gas, a correction unit correcting the first pressure sensor based on a second measurement value measured by the second pressure sensor, and a controller controlling the fuel cell system.
    Type: Application
    Filed: April 19, 2018
    Publication date: November 15, 2018
    Inventors: Toshihiro EGAWA, Masahiro OKUYOSHI