Patents by Inventor Naoto TAGAYA
Naoto TAGAYA 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: 11485234Abstract: A power supply system 1 includes: first power lines (21p, 21n) to which a first battery (B1) is connected; second power lines (31p, 31n) to which a second battery (B2) is connected; a voltage converter (5) which converts voltage; a power converter which converts electric power; a management ECU (71) and converter ECU (73) which operates the voltage converter (5); a smoothing capacitor connected to the first power lines (21p, 21n); and a motor ECU (72) which executes system interruption processing of determining the existence of failure of the contactors (22m, 22s, 32m, 32s) based on a change in voltage of the smoothing capacitor. The management ECU (71) and converter ECU (73) operate the voltage converter (5) so that a state in which the static voltage of the first battery (B1) is higher by at least the determination potential difference than the static voltage of the second battery (B2).Type: GrantFiled: June 4, 2020Date of Patent: November 1, 2022Assignee: HONDA MOTOR CO., LTD.Inventors: Naoto Tagaya, Hirokazu Oguma, Hiroki Sakamoto, Toshihiro Sone, Kenta Suzuki
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Patent number: 11070156Abstract: A power system includes: a first power circuit, having a first battery; a second power circuit, having a second battery, wherein a used voltage range of the second battery with respect to a closed circuit voltage overlaps with the first battery, and a static voltage of the second battery is lower than the first battery; a voltage converter, converting a voltage between the power circuits; a power converter, converting power between the first power circuit and a driving motor; and a management ECU and a motor ECU, operating the power converter based on required power. The management ECU and the motor ECU calculates limit power with respect to output power of the first battery based on an internal state of the second battery, and operates the power converter so that the output power of the first battery does not exceed the limit power.Type: GrantFiled: March 20, 2020Date of Patent: July 20, 2021Assignee: Honda Motor Co., Ltd.Inventors: Hirokazu Oguma, Naoto Tagaya
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Publication number: 20200384866Abstract: A power supply system 1 includes: first power lines (21p, 21n) to which a first battery (B1) is connected; second power lines (31p, 31n) to which a second battery (B2) is connected; a voltage converter (5) which converts voltage; a power converter which converts electric power; a management ECU (71) and converter ECU (73) which operates the voltage converter (5); a smoothing capacitor connected to the first power lines (21p, 21n); and a motor ECU (72) which executes system interruption processing of determining the existence of failure of the contactors (22m, 22s, 32m, 32s) based on a change in voltage of the smoothing capacitor. The management ECU (71) and converter ECU (73) operate the voltage converter (5) so that a state in which the static voltage of the first battery (B1) is higher by at least the determination potential difference than the static voltage of the second battery (B2).Type: ApplicationFiled: June 4, 2020Publication date: December 10, 2020Inventors: Naoto TAGAYA, Hirokazu OGUMA, Hiroki SAKAMOTO, Toshihiro SONE, Kenta SUZUKI
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Publication number: 20200313595Abstract: A power system includes: a first power circuit, having a first battery; a second power circuit, having a second battery, wherein a used voltage range of the second battery with respect to a closed circuit voltage overlaps with the first battery, and a static voltage of the second battery is lower than the first battery; a voltage converter, converting a voltage between the power circuits; a power converter, converting power between the first power circuit and a driving motor; and a management ECU and a motor ECU, operating the power converter based on required power. The management ECU and the motor ECU calculates limit power with respect to output power of the first battery based on an internal state of the second battery, and operates the power converter so that the output power of the first battery does not exceed the limit power.Type: ApplicationFiled: March 20, 2020Publication date: October 1, 2020Applicant: Honda Motor Co.,Ltd.Inventors: Hirokazu OGUMA, Naoto TAGAYA
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Patent number: 9981567Abstract: A battery controller that controls a battery for supplying power to a load apparatus, includes a current detection unit that detects a discharge current and a charge current of the battery, a malfunction detection unit that detects malfunction of a voltage detector for detecting a voltage of the battery, and a contactor control unit that is provided on a power supply line through which the discharge current and the charge current flow to open/close a contactor. The contactor control unit integrates the charge and discharge current when the malfunction of the voltage detector is detected, calculates an actual charge current amount obtained by subtracting an integrated value of the discharge current from an integrated value of the charge current, and prohibits charging/discharging of the battery by controlling the contactor when the actual charge current amount is equal to or more than a predetermined value.Type: GrantFiled: October 6, 2016Date of Patent: May 29, 2018Assignee: MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHAInventors: Shohei Kawano, Toshifumi Mizui, Yoshifumi Nobori, Atsushi Kodama, Naoto Tagaya, Katsuyoshi Muramatsu
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Publication number: 20170101029Abstract: A battery controller that controls a battery for supplying power to a load apparatus, includes a current detection unit that detects a discharge current and a charge current of the battery, a malfunction detection unit that detects malfunction of a voltage detector for detecting a voltage of the battery, and a contactor control unit that is provided on a power supply line through which the discharge current and the charge current flow to open/close a contactor. The contactor control unit integrates the charge and discharge current when the malfunction of the voltage detector is detected, calculates an actual charge current amount obtained by subtracting an integrated value of the discharge current from an integrated value of the charge current, and prohibits charging/discharging of the battery by controlling the contactor when the actual charge current amount is equal to or more than a predetermined value.Type: ApplicationFiled: October 6, 2016Publication date: April 13, 2017Applicant: MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHAInventors: Shohei KAWANO, Toshifumi MIZUI, Yoshifumi NOBORI, Atsushi KODAMA, Naoto TAGAYA, Katsuyoshi MURAMATSU
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Patent number: 9278622Abstract: The battery management unit for a vehicle includes a charger mounted on the vehicle, configured to connect to an external power source and charge an assembled battery including a plurality of cells with electric power from the external power source; a memory that records which cell is a lowest cell having the lowest voltage when the battery is fully charged; and a cell-balancer that carries out cell-balancing on the voltage of the battery by discharging, when the charger is not charging the battery, the cells having a voltage higher than a current voltage of the lowest cell to the current value of the lowest cell. Thereby, it is possible to suppress an increase in dispersion of voltages and reduction in battery capacity.Type: GrantFiled: July 9, 2013Date of Patent: March 8, 2016Assignee: MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHAInventors: Naoto Tagaya, Katsuyoshi Muramatsu
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Publication number: 20140015483Abstract: The battery management unit for a vehicle includes a charger mounted on the vehicle, configured to connect to an external power source and charge an assembled battery including a plurality of cells with electric power from the external power source; a memory that records which cell is a lowest cell having the lowest voltage when the battery is fully charged; and a cell-balancer that carries out cell-balancing on the voltage of the battery by discharging, when the charger is not charging the battery, the cells having a voltage higher than a current voltage of the lowest cell to the current value of the lowest cell. Thereby, it is possible to suppress an increase in dispersion of voltages and reduction in battery capacity.Type: ApplicationFiled: July 9, 2013Publication date: January 16, 2014Inventors: Naoto TAGAYA, Katsuyoshi MURAMATSU