Patents by Inventor Masahiro Okuyoshi

Masahiro Okuyoshi 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: 8293421
    Abstract: The aim of the invention is to improve the accuracy of estimating residual water content in a fuel cell system adopting an intermittent operation mode and to accurately suppress cell voltage reduction due to water accumulation caused by the intermittent operation. The fuel cell system includes: a fuel cell having a cell laminate; an estimating unit for estimating a residual water content distribution in a reactant gas flow channel and a moisture content distribution in an electrolyte membrane in a cell plane of each single cell while taking into consideration water transfer that occurs between an anode electrode and a cathode electrode via the electrolyte membrane; and an operation control unit which changes the content of an intermittent operation when a residual water content in the reactant gas flow channel estimated by the estimating unit is equal to or greater than a predetermined threshold.
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: October 23, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masahiro Okuyoshi, Masaaki Matsusue, Masashi Toida
  • Patent number: 8252474
    Abstract: An object of the invention is to provide a fuel cell system capable of improving accuracy of water content estimation during a standstill. A fuel cell system includes a fuel cell having a plurality of single cells laminated together and an estimating unit for estimating residual water content distributions in a fuel gas flow channel and an oxidation gas flow channel and a moisture content distribution in an electrolyte membrane in a cell plane of each single cell while taking into consideration water transfer that occurs between an anode electrode and a cathode electrode via the electrolyte membrane. The estimating unit estimates a residual water content of the fuel gas flow channel during a standstill from a shutdown to a restart of the fuel cell system based on temperature information on each single cell acquired during the standstill.
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: August 28, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masahiro Okuyoshi, Masaaki Matsusue, Masashi Toida
  • Patent number: 8192880
    Abstract: A fuel cell system of the invention includes, a fuel cell, a water reservoir configured to accumulate water discharged from the fuel cells, and a status estimator configured to estimate a status of the water reservoir based on a stated of the fuel cell.
    Type: Grant
    Filed: October 16, 2008
    Date of Patent: June 5, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Naoki Kanie, Masahiro Okuyoshi
  • Publication number: 20110274992
    Abstract: The water content estimation apparatus for a fuel cell includes an estimating unit for estimating a residual water content distribution in a reactant gas flow channel and a moisture content distribution in an electrolyte membrane in a cell plane of a single cell while taking into consideration water transfer that occurs between an anode electrode and a cathode electrode via the electrolyte membrane between the anode electrode and the cathode electrode. The fuel cell system performs control based on an estimation result by the estimating unit so that the fuel cell assumes a predetermined water condition.
    Type: Application
    Filed: June 17, 2011
    Publication date: November 10, 2011
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masashi TOIDA, Masahiro OKUYOSHI, Masaaki MATSUSUE
  • Publication number: 20110274993
    Abstract: A fuel cell system includes: a fuel cell including a cell laminate; an estimating unit for estimating a residual water content distribution in the reactant gas flow channel in a cell plane of each of the single cells and a moisture content distribution in the electrolyte membrane in consideration of water transfer through the electrolyte membrane between the anode electrode and the cathode electrode; and an operation control unit for limiting an electric current drawn from the fuel cell when a residual water content in the reactant gas flow channel estimated by the estimating unit is equal to or above a predetermined threshold.
    Type: Application
    Filed: June 17, 2011
    Publication date: November 10, 2011
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiro OKUYOSHI, Masaaki MATSUSUE, Masashi TOIDA
  • Publication number: 20110250519
    Abstract: The aim of the invention is to improve the accuracy of estimating residual water content in a fuel cell system adopting an intermittent operation mode and to accurately suppress cell voltage reduction due to water accumulation caused by the intermittent operation. The fuel cell system includes: a fuel cell having a cell laminate; an estimating unit for estimating a residual water content distribution in a reactant gas flow channel and a moisture content distribution in an electrolyte membrane in a cell plane of each single cell while taking into consideration water transfer that occurs between an anode electrode and a cathode electrode via the electrolyte membrane; and an operation control unit which changes the content of an intermittent operation when a residual water content in the reactant gas flow channel estimated by the estimating unit is equal to or greater than a predetermined threshold.
    Type: Application
    Filed: June 17, 2011
    Publication date: October 13, 2011
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiro OKUYOSHI, Masaaki MATSUSUE, Masashi TOIDA
  • Publication number: 20110244350
    Abstract: An object of the invention is to provide a fuel cell system capable of improving accuracy of water content estimation during a standstill. A fuel cell system includes a fuel cell having a plurality of single cells laminated together and an estimating unit for estimating residual water content distributions in a fuel gas flow channel and an oxidation gas flow channel and a moisture content distribution in an electrolyte membrane in a cell plane of each single cell while taking into consideration water transfer that occurs between an anode electrode and a cathode electrode via the electrolyte membrane. The estimating unit estimates a residual water content of the fuel gas flow channel during a standstill from a shutdown to a restart of the fuel cell system based on temperature information on each single cell acquired during the standstill.
    Type: Application
    Filed: June 17, 2011
    Publication date: October 6, 2011
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiro OKUYOSHI, Masaaki MATSUSUE, Masashi TOIDA
  • Publication number: 20110217611
    Abstract: It is an object of the invention to improve the accuracy of estimating a moisture content and suppress an effect of remaining water at the startup of the fuel cell system. A fuel cell system includes: a fuel cell including a cell laminate; an estimating unit for estimating a residual water content distribution in the reactant gas flow channel and a moisture content distribution in the electrolyte membrane in a cell plane of each single cell while taking into consideration water transfer that occurs between the anode electrode and the cathode electrode via the electrolyte membrane; and an operation control unit for, based on an estimation result from the estimating unit, setting a scavenging time used in a scavenging process for the fuel cell after the fuel cell system is shut down.
    Type: Application
    Filed: May 12, 2011
    Publication date: September 8, 2011
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiro OKUYOSHI, Masaaki MATSUSUE, Masashi TOIDA
  • Publication number: 20100035107
    Abstract: A fuel cell system of the invention includes, a fuel cell, a water reservoir configured to accumulate water discharged from the fuel cells, and a status estimator configured to estimate a status of the water reservoir based on a stated of the fuel cell.
    Type: Application
    Filed: October 16, 2008
    Publication date: February 11, 2010
    Inventors: Naoki Kanie, Masahiro Okuyoshi
  • Publication number: 20090191438
    Abstract: Provided is a fuel cell system, which can inform the user of the input of a control command for low-temperature countermeasures, if necessary, at a proper timing. A control unit decides whether or not an ambient temperature To of a remote-part temperature is lower than 0° C. for the time period from a start request to a stop request of the system. The control unit informs, when it decides that either temperature is lower than 0° C., the user of a message for urging the input of the control command for the low-temperature countermeasures.
    Type: Application
    Filed: April 19, 2007
    Publication date: July 30, 2009
    Inventors: Nobuo Fujita, Masahiro Okuyoshi, Masataka Ota