Patents by Inventor Takahiro Kaito
Takahiro Kaito 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).
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Patent number: 10847811Abstract: An object is to provide a catalyst particle that can exhibit high activity. The catalyst particle is an alloy particle formed of platinum atom and a non-platinum metal atom, wherein (i) the alloy particle has an L12 structure as an internal structure and has an extent of ordering of L12 structure in the range of 30 to 100%, (ii) the alloy particle has an LP ratio calculated by CO stripping method of 10% or more, and (iii) the alloy particle has a dN/dA ratio in the range of 0.4 to 1.0.Type: GrantFiled: May 30, 2018Date of Patent: November 24, 2020Assignee: NISSAN MOTOR CO., LTD.Inventors: Kazuki Arihara, Hiroyuki Tanaka, Hisashi Mitsumoto, Takahiro Kaito, Seiho Sugawara, Tsukuru Ohwaki
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Patent number: 10193177Abstract: A fuel cell system and method that enables warm-up power generation corresponding to the residual water volume in the fuel cell stack without using auxiliary devices for measuring the residual water volume in the fuel cell stack. A controller computes total generated electrical energy Q by integrating of the generated current detected by current sensor during the period from start-up to shutting down of the fuel cell system, and stores the result in total generated electrical energy storage part. Also, controller measures fuel cell temperature Ts at the last shutting down cycle with temperature sensor, and stores it in power generation shutting down temperature storage part.Type: GrantFiled: June 9, 2014Date of Patent: January 29, 2019Assignee: NISSAN MOTOR CO., LTD.Inventors: Takahiro Kaito, Keigo Ikezoe
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Patent number: 10164275Abstract: A fuel cell system includes: a wetness target value calculating unit configured to calculate a target value of a wet state of the fuel cell; a gas required flow rate calculating unit configured to calculate a cathode gas required flow rate on the basis of a power generation request to the fuel cell; a wetness-control anode gas flow rate calculating unit configured to calculate a wetness-control anode gas circulation flow rate at least on the basis of the wetness target value and the cathode gas required flow rate during a dry control; an anode gas flow rate control unit configured to control an anode gas circulation flow rate on the basis of the wetness-control anode gas circulation flow rate; a wetness-control cathode gas flow rate calculating unit configured to calculate a wetness-control cathode gas flow rate at least on the basis of the wetness target value and a measured value or estimated value of the anode gas circulation flow rate during the dry control; and a cathode gas flow rate control unit configType: GrantFiled: March 13, 2014Date of Patent: December 25, 2018Assignee: NISSAN MOTOR CO., LTD.Inventors: Tetsuya Aoki, Takahiro Kaito, Takahiro Fujii
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Publication number: 20180277856Abstract: An object is to provide a catalyst particle that can exhibit high activity. The catalyst particle is an alloy particle formed of platinum atom and a non-platinum metal atom, wherein (i) the alloy particle has an L12 structure as an internal structure and has an extent of ordering of L12 structure in the range of 30 to 100%, (ii) the alloy particle has an LP ratio calculated by CO stripping method of 10% or more, and (iii) the alloy particle has a dN/dA ratio in the range of 0.4 to 1.0.Type: ApplicationFiled: May 30, 2018Publication date: September 27, 2018Applicant: NISSAN MOTOR CO., LTD.Inventors: Kazuki Arihara, Hiroyuki Tanaka, Hisashi Mitsumoto, Takahiro Kaito, Seiho Sugawara, Tsukuru Ohwaki
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Patent number: 10014532Abstract: An object is to provide a catalyst particle that can exhibit high activity. The catalyst particle is an alloy particle formed of platinum atom and a non-platinum metal atom, wherein (i) the alloy particle has an L12 structure as an internal structure and has an extent of ordering of L12 structure in the range of 30 to 100%, (ii) the alloy particle has an LP ratio calculated by CO stripping method of 10% or more, and (iii) the alloy particle has a dN/dA ratio in the range of 0.4 to 1.0.Type: GrantFiled: August 6, 2014Date of Patent: July 3, 2018Assignee: NISSAN MOTOR CO., LTD.Inventors: Kazuki Arihara, Hiroyuki Tanaka, Hisashi Mitsumoto, Takahiro Kaito, Seiho Sugawara, Tsukuru Ohwaki
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Publication number: 20170018791Abstract: A fuel cell system includes: a wetness target value calculating unit configured to calculate a target value of a wet state of the fuel cell; a gas required flow rate calculating unit configured to calculate a cathode gas required flow rate on the basis of a power generation request to the fuel cell; a wetness-control anode gas flow rate calculating unit configured to calculate a wetness-control anode gas circulation flow rate at least on the basis of the wetness target value and the cathode gas required flow rate during a dry control; an anode gas flow rate control unit configured to control an anode gas circulation flow rate on the basis of the wetness-control anode gas circulation flow rate; a wetness-control cathode gas flow rate calculating unit configured to calculate a wetness-control cathode gas flow rate at least on the basis of the wetness target value and a measured value or estimated value of the anode gas circulation flow rate during the dry control; and a cathode gas flow rate control unit configType: ApplicationFiled: March 13, 2014Publication date: January 19, 2017Applicant: NISSAN MOTOR CO., LTD.Inventors: Tetsuya AOKI, Takahiro KAITO, Takahiro FUJII
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Publication number: 20160197358Abstract: An object is to provide a catalyst particle that can exhibit high activity. The catalyst particle is an alloy particle formed of platinum atom and a non-platinum metal atom, wherein (i) the alloy particle has an L12 structure as an internal structure and has an extent of ordering of L12 structure in the range of 30 to 100%, (ii) the alloy particle has an LP ratio calculated by CO stripping method of 10% or more, and (iii) the alloy particle has a dN/dA ratio in the range of 0.4 to 1.0.Type: ApplicationFiled: August 6, 2014Publication date: July 7, 2016Applicant: NISSAN MOTOR CO., LTD.Inventors: Kazuki ARIHARA, Hiroyuki TANAKA, Hisashi MITSUMOTO, Takahiro KAITO, Seiho SUGAWARA, Tsukuru OHWAKI
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Patent number: 8900770Abstract: A fuel cell system and a method for controlling the same. The system and method employ a fuel cell stack that generates electrical power by electrochemical reaction of a fuel gas and an oxidant gas, a total generated electrical energy computation device that computes a value pertaining to the total generated electrical energy as the sum of the electrical energy generated by said fuel cell stack from start-up of the fuel cell system, and a residual water volume estimation device that estimates the residual water volume left in the fuel cell stack based on said value pertaining to said total generated electrical energy computed by said total generated electrical energy computation device.Type: GrantFiled: June 18, 2008Date of Patent: December 2, 2014Assignee: Nissan Motor Co., Ltd.Inventors: Takahiro Kaito, Keigo Ikezoe
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Publication number: 20140335430Abstract: A fuel cell system and method that enables warm-up power generation corresponding to the residual water volume in the fuel cell stack without using auxiliary devices for measuring the residual water volume in the fuel cell stack. A controller computes total generated electrical energy Q by integrating of the generated current detected by current sensor during the period from start-up to shutting down of the fuel cell system, and stores the result in total generated electrical energy storage part. Also, controller measures fuel cell temperature Ts at the last shutting down cycle with temperature sensor, and stores it in power generation shutting down temperature storage part.Type: ApplicationFiled: June 9, 2014Publication date: November 13, 2014Inventors: Takahiro KAITO, Keigo IKEZOE
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Publication number: 20140281613Abstract: For every application, a storage unit stores performance information which indicates processing performance required for processing of the application. A derivation unit derives processing performance required for processing of an application executed in a processor on the basis of the performance information. A frequency control unit controls an operation frequency of a CPU in accordance with the processing performance derived by the derivation unit.Type: ApplicationFiled: November 25, 2013Publication date: September 18, 2014Applicant: FUJITSU LIMITEDInventor: Takahiro KAITO
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Patent number: 8795908Abstract: A fuel cell system has an oxidizer gas flow rate adjuster that adjusts a flow rate of oxidizer gas of the fuel cell stack and a controller that determines a humidity state in the fuel cell stack. The controller has an average cell voltage calculator that calculates an average cell voltage, a minimum cell voltage calculator that calculates a minimum cell value, a voltage difference calculator that calculates a voltage difference between the average cell voltage and the minimum cell voltage, and a voltage comparator that compares the absolute voltage difference with a preset value. The flow rate of the oxidizer gas is changed based on a comparison between the absolute voltage difference and the preset value, and then the humidity state in the fuel cell stack is determined based on a change in the absolute voltage difference.Type: GrantFiled: January 22, 2007Date of Patent: August 5, 2014Assignee: Nissan Motor Co., Ltd.Inventor: Takahiro Kaito
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Patent number: 8790836Abstract: A fuel cell system and method that enables warm-up power generation corresponding to the residual water volume in the fuel cell stack without using auxiliary devices for measuring the residual water volume in the fuel cell stack. A controller computes total generated electrical energy Q by integrating of the generated current detected by current sensor during the period from start-up to shutting down of the fuel cell system, and stores the result in total generated electrical energy storage part. Also, controller measures fuel cell temperature Ts at the last shutting down cycle with temperature sensor, and stores it in power generation shutting down temperature storage part.Type: GrantFiled: June 18, 2008Date of Patent: July 29, 2014Assignee: Nissan Motor Co., Ltd.Inventors: Takahiro Kaito, Keigo Ikezoe
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Patent number: 8492037Abstract: A fuel cell system includes a fuel cell stack A cell voltage detector detects a cell voltage at a cathode outlet-side of a single cell. A total voltage detector detects a total voltage of the fuel cell stack. A cell voltage difference computing unit determines an average cell voltage and a minimum cell voltage and computes a difference A stack current detector detects electric current. An anode outlet local current detector detects a local current. A current density-computing unit computes a stack current density and an anode outlet local current density. A wet state-judging unit judges a wet state of the fuel cell stack based on the difference between the average cell voltage and the minimum cell voltage, and based on the difference between the stack current density and the anode outlet local current density.Type: GrantFiled: August 9, 2007Date of Patent: July 23, 2013Assignee: Nissan Motor Co., Ltd.Inventor: Takahiro Kaito
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Publication number: 20100190071Abstract: A fuel cell system and method that enables warm-up power generation corresponding to the residual water volume in the fuel cell stack without using auxiliary devices for measuring the residual water volume in the fuel cell stack. A controller computes total generated electrical energy Q by integrating of the generated current detected by current sensor during the period from start-up to shutting down of the fuel cell system, and stores the result in total generated electrical energy storage part. Also, controller measures fuel cell temperature Ts at the last shutting down cycle with temperature sensor, and stores it in power generation shutting down temperature storage part.Type: ApplicationFiled: June 18, 2008Publication date: July 29, 2010Inventors: Takahiro Kaito, Keigo Ikezoe
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Publication number: 20100167144Abstract: A fuel cell system and a method for controlling the same. The system and method employ a fuel cell stack that generates electrical power by electrochemical reaction of a fuel gas and an oxidant gas, a total generated electrical energy computation device that computes a value pertaining to the total generated electrical energy as the sum of the electrical energy generated by said fuel cell stack from start-up of the fuel cell system, and a residual water volume estimation device that estimates the residual water volume left in the fuel cell stack based on said value pertaining to said total generated electrical energy computed by said total generated electrical energy computation device.Type: ApplicationFiled: June 18, 2008Publication date: July 1, 2010Applicant: Nissan Motor Co., Ltd.Inventors: Takahiro Kaito, Keigo Ikezoe
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Publication number: 20090258257Abstract: A fuel cell system including a fuel cell stack having a plurality of single cells stacked on one another, each single cell including an anode to which fuel gas can be supplied, a cathode to which oxidizing gas can be supplied, and a solid polymer electrolyte membrane interposed between the anode and the cathode. The oxidizing gas and the fuel gas are configured for counter-flow with respect to each other. A cell voltage detector detects a cell voltage at a cathode outlet-side of a single cell. A total voltage detector detects a total voltage of the fuel cell stack. A cell voltage difference computing unit is configured to determine an average cell voltage from the total cell voltage detector and a minimum cell voltage from the cell voltage detector and to compute a difference between the average cell voltage and the minimum cell voltage. A stack current detector detects electric current in the fuel cell stack.Type: ApplicationFiled: August 9, 2007Publication date: October 15, 2009Applicant: NISSAN MOTOR CO., LTD.Inventor: Takahiro Kaito
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Publication number: 20080311449Abstract: A fuel cell system has an oxidizer gas flow rate adjuster that adjusts a flow rate of oxidizer gas of the fuel cell stack and a controller that determines a humidity state in the fuel cell stack. The controller has an average cell voltage calculator that calculates an average cell voltage, a minimum cell voltage calculator that calculates a minimum cell value, a voltage difference calculator that calculates a voltage difference between the average cell voltage and the minimum cell voltage, and a voltage comparator that compares the absolute voltage difference with a preset value. The flow rate of the oxidizer gas is changed based on a comparison between the absolute voltage difference and the preset value, and then the humidity state in the fuel cell stack is determined based on a change in the absolute voltage difference.Type: ApplicationFiled: January 22, 2007Publication date: December 18, 2008Applicant: NISSAN MOTOR CO., LTD.Inventor: Takahiro Kaito