Patents by Inventor Takayoshi Tezuka
Takayoshi Tezuka 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: 9509005Abstract: A fuel cell system suppresses the deterioration of an electrolyte membrane of a fuel cell. The fuel cell system comprises: a temperature rise speed calculation unit for calculating a target temperature rise speed of the fuel cell using a temperature of the fuel cell and a water content of the fuel cell; and a drive control unit for controlling a drive of the cooling water pump using the temperature rise speed of the fuel cell and the target temperature rise speed calculated by the temperature rise speed calculation unit. The drive control unit controls the drive of the cooling water pump such that a circulation amount of the cooling water is decreased when the temperature rise speed of the fuel cell is below the target temperature rise speed and controls the drive of the cooling water pump such that the circulation amount of the cooling water is increased when the temperature rise speed of the fuel cell is equal to or greater than the target temperature rise speed.Type: GrantFiled: September 26, 2014Date of Patent: November 29, 2016Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yoshiaki Naganuma, Hiromi Tanaka, Osamu Yumita, Takayoshi Tezuka, Nobukazu Mizuno, Masashi Fuji
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Patent number: 9073437Abstract: The calculation unit converts into a battery age each parameter calculated for a different factor of degradation of a battery. If at least one of the battery ages has reached an upper limit age, the determination unit determines that it is necessary to conduct a battery diagnosis. Once it has been determined that it is necessary to conduct the battery diagnosis, the display control unit causes a display device to display a diagnosis request message. After displaying the diagnosis request message has started if there is no result of the battery diagnosis received the electric power limiter unit limits electric power charged to and discharged from the battery. After the electric power charged to/discharged from the battery is limited if there is no result of the battery diagnosis received the start-up prohibition unit prohibits starting a system driving the vehicle.Type: GrantFiled: May 14, 2010Date of Patent: July 7, 2015Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Junichi Matsumoto, Keiji Kaita, Takayoshi Tezuka, Teruo Ishishita
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Publication number: 20150017561Abstract: A fuel cell system suppresses the deterioration of an electrolyte membrane of a fuel cell. The fuel cell system comprises: a temperature rise speed calculation unit for calculating a target temperature rise speed of the fuel cell using a temperature of the fuel cell and a water content of the fuel cell; and a drive control unit for controlling a drive of the cooling water pump using the temperature rise speed of the fuel cell and the target temperature rise speed calculated by the temperature rise speed calculation unit. The drive control unit controls the drive of the cooling water pump such that a circulation amount of the cooling water is decreased when the temperature rise speed of the fuel cell is below the target temperature rise speed and controls the drive of the cooling water pump such that the circulation amount of the cooling water is increased when the temperature rise speed of the fuel cell is equal to or greater than the target temperature rise speed.Type: ApplicationFiled: September 26, 2014Publication date: January 15, 2015Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yoshiaki NAGANUMA, Hiromi TANAKA, Osamu YUMITA, Takayoshi TEZUKA, Nobukazu MIZUNO, Masashi FUJI
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Patent number: 8871401Abstract: A fuel cell system suppresses the deterioration of an electrolyte membrane of a fuel cell. The fuel cell system comprises: a temperature rise speed calculation unit for calculating a target temperature rise speed of the fuel cell using a temperature of the fuel cell and a water content of the fuel cell; and a drive control unit for controlling a drive of the cooling water pump using the temperature rise speed of the fuel cell and the target temperature rise speed calculated by the temperature rise speed calculation unit. The drive control unit controls the drive of the cooling water pump such that a circulation amount of the cooling water is decreased when the temperature rise speed of the fuel cell is below the target temperature rise speed and controls the drive of the cooling water pump such that the circulation amount of the cooling water is increased when the temperature rise speed of the fuel cell is equal to or greater than the target temperature rise speed.Type: GrantFiled: April 27, 2010Date of Patent: October 28, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yoshiaki Naganuma, Hiromi Tanaka, Osamu Yumita, Takayoshi Tezuka, Nobukazu Mizuno, Masashi Fuji
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Patent number: 8843333Abstract: A battery system includes a discharge amount obtaining portion that obtains a discharge amount (determination zone discharge amount) from a determination start voltage until a predetermined determination end voltage of a battery; an internal resistance obtaining portion that obtains an internal resistance value of the battery; a correlation map in which a combination of internal resistance value information and determination zone discharge amount information for a battery that is the same kind as a target of a determination and in which lithium deposition has not occurred is stored for each degree of age-related deterioration of the battery; and a deposition determining portion that determines a degree of lithium deposition in the target battery by comparing the determination zone discharge amount during the determination of the target battery with the internal resistance value during the determination of the target battery on the same scale by converting at least one via the correlation map.Type: GrantFiled: March 31, 2011Date of Patent: September 23, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takayoshi Tezuka, Teruo Ishishita, Ryo Mano, Junichi Matsumoto
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Patent number: 8524406Abstract: An object is to suppress the degradation of durability due to a heat concentration while performing a rapid warm-up operation as necessary, when starting a fuel cell system at temperatures below freezing point.Type: GrantFiled: January 27, 2010Date of Patent: September 3, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hiromi Tanaka, Yoshiaki Naganuma, Osamu Yumita, Takayoshi Tezuka, Nobukazu Mizuno, Masashi Fuji
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Publication number: 20130132011Abstract: A diagnostic device diagnoses a lithium ion battery including a plurality of battery blocks. If a condition is established for starting a diagnosis, the diagnostic device starts discharging the battery, and after each battery block has a voltage decreased to a measurement starting voltage until the block has the voltage decreased to a measurement ending voltage the block discharges an amount of power, which the diagnostic device calculates for the battery block. If all blocks each discharge power in an amount larger than a brand-new product threshold value the diagnostic device determines that the battery is in a brand new condition. If all blocks each discharge power in an amount larger than a uselessness threshold value the diagnostic device determines that the battery is useful. If at least one block discharges power in an amount smaller than the uselessness threshold value the diagnostic device determines that the battery is useless.Type: ApplicationFiled: May 21, 2010Publication date: May 23, 2013Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Ryo Mano, Teruo Ishishita, Junichi Matsumoto, Takayoshi Tezuka
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Publication number: 20130049973Abstract: The calculation unit converts into a battery age each parameter calculated for a different factor of degradation of a battery. If at least one of the battery ages has reached an upper limit age, the determination unit determines that it is necessary to conduct a battery diagnosis. Once it has been determined that it is necessary to conduct the battery diagnosis, the display control unit causes a display device to display a diagnosis request message. After displaying the diagnosis request message has started if there is no result of the battery diagnosis received the electric power limiter unit limits electric power charged to and discharged from the battery. After the electric power charged to/discharged from the battery is limited if there is no result of the battery diagnosis received the start-up prohibition unit prohibits starting a system driving the vehicle.Type: ApplicationFiled: May 14, 2010Publication date: February 28, 2013Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Junichi Matsumoto, Keiji Kaita, Takayoshi Tezuka, Teruo Ishishita
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Patent number: 8383277Abstract: The standard permeation amount of an impurity substance, that is, the permeation amount per unit area of the impurity substance under a standard concentration is calculated from the gas pressures in the gas channels, the impedance, and the fuel cell temperature. The permeation index of the impurity substance at each of locations in the anode-side gas channel is calculated on the basis of the previously calculated value of the concentration distribution of the impurity substance. Then, on the basis of the standard permeation amount and the permeation index, the permeation amounts of the impurity substance at the locations in the anode-side gas channel are calculated. On the basis of a total of the permeation amounts, the amount of the impurity substance accumulated in the anode-side gas channel is calculated.Type: GrantFiled: February 29, 2008Date of Patent: February 26, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takayoshi Tezuka, Yoshihito Kanno
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Publication number: 20120215472Abstract: A battery system includes a discharge amount obtaining portion that obtains a discharge amount (determination zone discharge amount) from a determination start voltage until a predetermined determination end voltage of a battery; an internal resistance obtaining portion that obtains an internal resistance value of the battery; a correlation map in which a combination of internal resistance value information and determination zone discharge amount information for a battery that is the same kind as a target of a determination and in which lithium deposition has not occurred is stored for each degree of age-related deterioration of the battery; and a deposition determining portion that determines a degree of lithium deposition in the target battery by comparing the determination zone discharge amount during the determination of the target battery with the internal resistance value during the determination of the target battery on the same scale by converting at least one via the correlation map.Type: ApplicationFiled: March 31, 2011Publication date: August 23, 2012Inventors: Takayoshi Tezuka, Teruo Ishishita, Ryo Mano, Junichi Matsumoto
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Publication number: 20120015272Abstract: A fuel cell system suppresses the deterioration of an electrolyte membrane of a fuel cell. The fuel cell system comprises: a temperature rise speed calculation unit for calculating a target temperature rise speed of the fuel cell using a temperature of the fuel cell and a water content of the fuel cell; and a drive control unit for controlling a drive of the cooling water pump using the temperature rise speed of the fuel cell and the target temperature rise speed calculated by the temperature rise speed calculation unit. The drive control unit controls the drive of the cooling water pump such that a circulation amount of the cooling water is decreased when the temperature rise speed of the fuel cell is below the target temperature rise speed and controls the drive of the cooling water pump such that the circulation amount of the cooling water is increased when the temperature rise speed of the fuel cell is equal to or greater than the target temperature rise speed.Type: ApplicationFiled: April 27, 2010Publication date: January 19, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yoshiaki Naganuma, Hiromi Tanaka, Osamu Yumita, Takayoshi Tezuka, Nobukazu Mizuno, Masashi Fuji
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Publication number: 20120003557Abstract: An object is to suppress the degradation of durability due to a heat concentration while performing a rapid warm-up operation as necessary, when starting a fuel cell system at temperatures below freezing point.Type: ApplicationFiled: January 27, 2010Publication date: January 5, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiromi Tanaka, Yoshiaki Naganuma, Osamu Yumita, Takayoshi Tezuka, Nobukazu Mizuno, Masashi Fuji
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Publication number: 20090291342Abstract: A fuel cell system includes a fuel cell (1) having a plurality of unit cells (1a) stacked on each other, first and second end plates (1b, 1c) between which the plurality of unit cells are interposed, and a gas supply passage (1d) and a gas discharge passage (1e), both extending in the stacking direction of the unit cells. An inlet (1f) of the gas supply passage (1d) and an outlet (1g) of the gas discharge passage (1e) are located on the first end plate side. A hydrogen concentration sensor (4) is disposed in the gas discharge passage and detects a hydrogen concentration in the gas discharged from the plurality of unit cells. An electricity generation process in the fuel cell is controlled based on the hydrogen concentration detected by a hydrogen concentration sensor (4).Type: ApplicationFiled: March 14, 2007Publication date: November 26, 2009Inventors: Takayoshi Tezuka, Yoshihito Kanno, Hideaki Kume, Hidetoshi Kato
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Publication number: 20090202877Abstract: The standard permeation amount of an impurity substance, that is, the permeation amount per unit area of the impurity substance under a standard concentration is calculated from the gas pressures in the gas channels, the impedance, and the fuel cell temperature. The permeation index of the impurity substance at each of locations in the anode-side gas channel is calculated on the basis of the previously calculated value of the concentration distribution of the impurity substance. Then, on the basis of the standard permeation amount and the permeation index, the permeation amounts of the impurity substance at the locations in the anode-side gas channel are calculated. On the basis of a total of the permeation amounts, the amount of the impurity substance accumulated in the anode-side gas channel is calculated.Type: ApplicationFiled: February 29, 2008Publication date: August 13, 2009Applicant: Toyota Jidosha Kabushiki KaishaInventors: Takayoshi Tezuka, Yoshihito Kanno