Patents by Inventor Hayato Nagakura
Hayato Nagakura 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: 10286789Abstract: A secondary battery charger system in which a chargeable power is calculated on the basis of a difference between a charging target voltage and a cell voltage using a charging control unit that controls a charger used to charge a secondary battery, the secondary battery charger system including a charging threshold voltage setting unit configured to set the charging target voltage to be lower than a charging limitation voltage which is an upper limitation of the cell voltage allowable in design. The charging control unit stops the charging if a predetermined charging stop condition is satisfied while the cell voltage exceeds the charging target voltage and is lower than the charging limitation voltage.Type: GrantFiled: August 29, 2014Date of Patent: May 14, 2019Assignee: Nissan Motor Co., Ltd.Inventors: Hayato Nagakura, Kenichi Sakai, Kenji Hosaka, Kazuma Tamai, Hiroto Okabe
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Publication number: 20170274784Abstract: A secondary battery charger system in which a chargeable power capacity is calculated on the basis of a difference between a charging target voltage and a cell voltage using a charging control unit that controls a charger used to charge a secondary battery, the secondary battery charger system including a charging threshold voltage setting unit configured to set the charging target voltage to be lower than a charging limitation voltage which is an upper limitation of the cell voltage allowable in design. The charging control unit stops the charging if a predetermined charging stop condition is satisfied while the cell voltage exceeds the charging target voltage and is lower than the charging limitation voltage.Type: ApplicationFiled: August 29, 2014Publication date: September 28, 2017Inventors: Hayato Nagakura, Kenichi Sakai, Kenji Hosaka, Kazuma Tamai, Hiroto Okabe
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Patent number: 9312716Abstract: A battery charging system includes a battery, a load and a controller to control supply power to be supplied from an external power source to the battery and the load, in accordance with a request charging power and a request load power. The controller limits power supplied from the external power source to the battery to an allowable battery power, and distributes the supply power from the external power source between the battery and the load in a state holding limitation of limiting the supply power from the external power source to the allowable battery power when a request for the supply of power to the load is generated.Type: GrantFiled: June 7, 2011Date of Patent: April 12, 2016Assignee: NISSAN MOTOR CO., LTD.Inventors: Hayato Nagakura, Isamu Kazama
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Patent number: 9261564Abstract: In battery cell control system and method, a monitoring section connected to a battery cell included in an assembled battery, operated with the battery cell as a power source, and configured to monitor a state of the battery cell is provided and a first consumption of the battery cell which is consumed by the monitoring section in accordance with a voltage of the battery cell is estimated using the voltage of the battery cell.Type: GrantFiled: May 11, 2011Date of Patent: February 16, 2016Assignee: NISSAN MOTOR CO., LTD.Inventors: Kanako Okada, Hayato Nagakura
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Patent number: 9219377Abstract: A battery charging apparatus is configured to charge a battery with at least one of charging current and charging power set to a predetermined setpoint, wherein the battery includes a lithium secondary cell. The battery charging apparatus calculates a lithium deposition threshold voltage value based on the setpoint, wherein lithium is assumed to be deposited in the lithium secondary cell when a terminal voltage of the lithium secondary cell is above the lithium deposition threshold voltage value. Then, the battery charging apparatus compares the terminal voltage with the calculated lithium deposition threshold voltage value, and controls the at least one of charging current and charging power depending on the comparison.Type: GrantFiled: June 2, 2011Date of Patent: December 22, 2015Assignee: NISSAN MOTOR CO., LTD.Inventor: Hayato Nagakura
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Patent number: 9136727Abstract: When warming-up of a battery is in progress (S12), a battery charge state at the warming-up start time of the battery is set to a battery hold capacity SOChold (S14, S15), and a charge power for the battery is controlled so that a battery charge state SOC is kept at SOChold. When a present time is in a timer charge reservation time (S11), the charge power for the battery is controlled so that SOC becomes a full charge state SOCfull (S17). Even if SOC has a tendency to temporarily decrease due to a rapid increase of heater consumption power just after start of warming-up of the battery, by keeping SOC at SOChold (SOC=SOChold), SOC can reach a full charge state as intended during the timer charge reservation time. A proportion of charge using low-priced midnight power is increased to a maximum then running cost can be suppressed.Type: GrantFiled: March 1, 2012Date of Patent: September 15, 2015Assignee: NISSAN MOTOR CO., LTD.Inventors: Atsushi Takano, Kazuhiko Okino, Naoki Yamamoto, Shinsuke Higuchi, Takashi Iimori, Tsutomu Soga, Hayato Nagakura
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Patent number: 9118197Abstract: A charging control system is configured to calculate an internal resistance line indicating a relation between a value of a charging current and a value of a voltage of a battery, which voltage occurs when the charging current has flown into the battery, to obtain a maximum inputtable value point SMAX corresponding to a maximum inputtable power/current and a currently-inputted value point SINP corresponding to a charging power/current currently inputted to the battery, these points existing on the calculated internal resistance line. The charging control system is also configured to calculate a point located between the maximum inputtable value point SMAX and the currently-inputted value point SINP, as a target point STRG corresponding to a target charging power/current point, and to set, based on the calculated target point STRG, a charging power/current for charging the battery.Type: GrantFiled: June 7, 2011Date of Patent: August 25, 2015Assignee: NISSAN MOTOR CO., LTD.Inventor: Hayato Nagakura
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Publication number: 20130342015Abstract: When warming-up of a battery is in progress (S12), a battery charge state at the warming-up start time of the battery is set to a battery hold capacity SOChold (S14, S15), and a charge power for the battery is controlled so that a battery charge state SOC is kept at SOChold. When a present time is in a timer charge reservation time (S11), the charge power for the battery is controlled so that SOC becomes a full charge state SOCfull (S17). Even if SOC has a tendency to temporarily decrease due to a rapid increase of heater consumption power just after start of warming-up of the battery, by keeping SOC at SOChold (SOC=SOChold) SOC can reach a full charge state as intended during the timer charge reservation time. A proportion of charge using low-priced midnight power is increased to a maximum then running cost can be suppressed.Type: ApplicationFiled: March 1, 2012Publication date: December 26, 2013Applicant: NISSAN MOTOR CO., LTDInventors: Atsushi Takano, Kazuhiko Okino, Naoki Yamamoto, Shinsuke Higuchi, Takashi Iimori, Tsutomu Soga, Hayato Nagakura
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Publication number: 20130147424Abstract: When warming-up of a battery is in progress (S12), a battery charge state at the warming-up start time of the battery is set to a battery hold capacity SOChold (S19, S15), and a charge power for the battery is controlled so that a battery charge state SOC is kept at SOChold. When a present time is in a timer charge reservation time (S11), the charge power for the battery is controlled so that SOC becomes a full charge state SOCfull (S17). Even if SOC has a tendency to temporarily decrease due to a rapid increase of heater consumption power just after start of warming-up of the battery, by keeping SOC at SOChold (SOC=SOChold), SOC can reach a full charge state as intended during the timer charge reservation time. A proportion of charge using low-priced midnight power is increased to a maximum then running cost can be suppressed.Type: ApplicationFiled: March 1, 2012Publication date: June 13, 2013Inventors: Atsushi Takano, Kazuhiko Okino, Naoki Yamamoto, Shinsuke Higuchi, Takashi Iimori, Tsutomu Soga, Hayato Nagakura
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Publication number: 20130082519Abstract: A battery charging system includes a battery, a load and a controller to control supply power to be supplied from an external power source to the battery and the load, in accordance with a request charging power and a request load power. The controller limits power supplied from the external power source to the battery to an allowable battery power, and distributes the supply power from the external power source between the battery and the load in a state holding limitation of limiting the supply power from the external power source to the allowable battery power when a request for the supply of power to the load is generated.Type: ApplicationFiled: June 7, 2011Publication date: April 4, 2013Inventors: Hayato Nagakura, Isamu Kazama
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Publication number: 20130076365Abstract: In battery cell control system and method, a monitoring section connected to a battery cell included in an assembled battery, operated with the battery cell as a power source, and configured to monitor a state of the battery cell is provided and a first consumption of the battery cell which is consumed by the monitoring section in accordance with a voltage of the battery cell is estimated using the voltage of the battery cell.Type: ApplicationFiled: May 11, 2011Publication date: March 28, 2013Applicant: NISSAN MOTOR CO., LTD.Inventors: Kanako Okada, Hayato Nagakura
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Publication number: 20130076314Abstract: A charging control system is configured to calculate an internal resistance line indicating a relation between a value of a charging current and a value of a voltage of a battery, which voltage occurs when the charging current has flown into the battery, to obtain a maximum inputtable value point SMAX corresponding to a maximum inputtable power/current and a currently-inputted value point SINP corresponding to a charging power/current currently inputted to the battery, these points existing on the calculated internal resistance line. The charging control system is also configured to calculate a point located between the maximum inputtable value point SMAX and the currently-inputted value point SINP, as a target point STRG corresponding to a target charging power/current point, and to set, based on the calculated target point STRG, a charging power/current for charging the battery.Type: ApplicationFiled: June 7, 2011Publication date: March 28, 2013Inventor: Hayato Nagakura
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Publication number: 20130069584Abstract: A battery charging apparatus is configured to charge a battery with at least one of charging current and charging power set to a predetermined setpoint, wherein the battery includes a lithium secondary cell. The battery charging apparatus calculates a lithium deposition threshold voltage value based on the setpoint, wherein lithium is assumed to be deposited in the lithium secondary cell when a terminal voltage of the lithium secondary cell is above the lithium deposition threshold voltage value. Then, the battery charging apparatus compares the terminal voltage with the calculated lithium deposition threshold voltage value, and controls the at least one of charging current and charging power depending on the comparison.Type: ApplicationFiled: June 2, 2011Publication date: March 21, 2013Inventor: Hayato Nagakura
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Patent number: 7916504Abstract: A voltage detection device that is connected to a DC circuit to which a DC voltage is applied and that detects the DC voltage applied to the DC circuit includes a voltage conversion unit for outputting a first voltage that increases as the DC voltage increases and a second voltage that decreases as the DC voltage increases, an error detection unit for detecting an error for the first voltage and the second voltage based upon the first voltage and the second voltage when the DC voltage is 0, and a voltage calculation unit for correcting a difference between the first voltage and the second voltage based upon the error detected by the error detection unit and calculating the DC voltage based upon the corrected difference between the first voltage and the second voltage.Type: GrantFiled: January 12, 2007Date of Patent: March 29, 2011Assignee: Nissan Motor Co., Ltd.Inventors: Tsuyoshi Morita, Hayato Nagakura, Shinsuke Yoshida
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Patent number: 7808230Abstract: A voltage detection device that is connected to a DC circuit to which a DC voltage is applied and that detects the DC voltage applied to the DC circuit comprises a voltage conversion means for outputting a first voltage that increases as the DC voltage increases and a second voltage that decreases as the DC voltage increases, a voltage calculation means for inputting the first voltage and the second voltage outputted from the voltage conversion means and calculating the DC voltage based upon a difference between the inputted first voltage and the inputted second voltage, and a first failure judgment means for judging that failure has occurred if at least one of the first voltage and the second voltage is not inputted to the voltage calculation means.Type: GrantFiled: January 12, 2007Date of Patent: October 5, 2010Assignee: Nissan Motor Co., Ltd.Inventors: Tsuyoshi Morita, Hayato Nagakura, Shinsuke Yoshida
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Publication number: 20100164480Abstract: A voltage detection device that is connected to a DC circuit to which a DC voltage is applied and that detects the DC voltage applied to the DC circuit comprises a voltage conversion means for outputting a first voltage that increases as the DC voltage increases and a second voltage that decreases as the DC voltage increases, a voltage calculation means for inputting the first voltage and the second voltage outputted from the voltage conversion means and calculating the DC voltage based upon a difference between the inputted first voltage and the inputted second voltage, and a first failure judgment means for judging that failure has occurred if at least one of the first voltage and the second voltage is not inputted to the voltage calculation means.Type: ApplicationFiled: January 12, 2007Publication date: July 1, 2010Inventors: Tsuyoshi Morita, Hayato Nagakura, Shinsuke Yoshida
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Publication number: 20090190376Abstract: A voltage detection device that is connected to a DC circuit to which a DC voltage is applied and that detects the DC voltage applied to the DC circuit comprises a voltage conversion means for outputting a first voltage that increases as the DC voltage increases and a second voltage that decreases as the DC voltage increases, an error detection means for detecting an error for the first voltage and the second voltage based upon the first voltage and the second voltage when the DC voltage is 0, and a voltage calculation means for correcting a difference between the first voltage and the second voltage outputted by the voltage conversion means based upon the error detected by the error detection means and calculating the DC voltage based upon the corrected difference between the first voltage and the second voltage.Type: ApplicationFiled: January 12, 2007Publication date: July 30, 2009Inventors: Tsuyoshi Morita, Hayato Nagakura, Shinsuke Yoshida