Patents by Inventor Masahiko Tahara

Masahiko Tahara 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: 11766927
    Abstract: A vehicle includes: a low voltage battery constituted by a lithium-ion battery, the low voltage battery supplying an electric power to an electric component mounted to a vehicle; a high voltage battery constituted by a lithium-ion battery, the high voltage battery having an output voltage higher than an output voltage of the low voltage battery; a first rotating electrical machine that operates by an electric power supplied from the high voltage battery, the first rotating electrical machine generating a torque for driving the vehicle; and a second rotating electrical machine for starting the engine. The second rotating electrical machine operates by an electric power supplied from the high voltage battery.
    Type: Grant
    Filed: June 1, 2020
    Date of Patent: September 26, 2023
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Yoshimasa Nishihiro, Masahiko Tahara, Masaharu Mochizuki, Takurou Hirano
  • Patent number: 11565603
    Abstract: A sub-battery (33) having an internal resistance lower than that of a main battery (32) is connected to a power supply circuit (31) connected to the main battery (32). In this case, the sub-battery (33) is connected to the power supply circuit (31) after the voltage ECKT of the power supply circuit (31) is adjusted to the voltage ESub of the sub-battery (33) by controlling the power generation voltage EALT of an alternator (24) connected to the power supply circuit (31).
    Type: Grant
    Filed: September 15, 2021
    Date of Patent: January 31, 2023
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Akifumi Koishi, Masahiko Tahara, Atsushi Tezuka, Tomoyuki Koike, Munemitsu Watanabe, Terumasa Tsuchiya
  • Publication number: 20220242246
    Abstract: The power supply device includes a low voltage battery, a high voltage battery, a starter generator, a DC-DC converter, a changeover switch, and a controller. When an abnormality or a failure has occurred in the DC-DC converter, the controller controls the changeover switch to connect the starter generator to the other battery without via the DC-DC converter and controls the output of the starter generator corresponding to the connected other battery.
    Type: Application
    Filed: June 1, 2020
    Publication date: August 4, 2022
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Yoshimasa NISHIHIRO, Masahiko TAHARA, Masaharu MOCHIZUKI, Takurou HIRANO
  • Publication number: 20220234436
    Abstract: A vehicle includes: a low voltage battery constituted by a lithium-ion battery, the low voltage battery supplying an electric power to an electric component mounted to a vehicle; a high voltage battery constituted by a lithium-ion battery, the high voltage battery having an output voltage higher than an output voltage of the low voltage battery; a first rotating electrical machine that operates by an electric power supplied from the high voltage battery, the first rotating electrical machine generating a torque for driving the vehicle; and a second rotating electrical machine for starting the engine. The second rotating electrical machine operates by an electric power supplied from the high voltage battery.
    Type: Application
    Filed: June 1, 2020
    Publication date: July 28, 2022
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Yoshimasa NISHIHIRO, Masahiko TAHARA, Masaharu MOCHIZUKI, Takurou HIRANO
  • Patent number: 11309578
    Abstract: A power supply system that is mountable on a vehicle includes a lithium-ion storage battery connected to an electrical load via two paths being a first path and a second path, a power generator capable of charging the lithium-ion storage battery, a first switch provided on the first path, an electrical resistance element provided on the second path, and a controller configured to control on/off of the power generator and perform on/off control of the first switch. According to a voltage increase request from the electrical load, the controller is configured to turn of the first switch such that a power supply to the lithium-ion storage battery through the first path from the power generator is cut.
    Type: Grant
    Filed: March 13, 2017
    Date of Patent: April 19, 2022
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tomoyuki Koike, Munemitsu Watanabe, Akifumi Koishi, Masahiko Tahara, Terumasa Tsuchiya, Atsushi Tezuka
  • Publication number: 20220001768
    Abstract: A sub-battery (33) having an internal resistance lower than that of a main battery (32) is connected to a power supply circuit (31) connected to the main battery (32). In this case, the sub-battery (33) is connected to the power supply circuit (31) after the voltage ECKT of the power supply circuit (31) is adjusted to the voltage ESub of the sub-battery (33) by controlling the power generation voltage EALT of an alternator (24) connected to the power supply circuit (31).
    Type: Application
    Filed: September 15, 2021
    Publication date: January 6, 2022
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Akifumi Koishi, Masahiko Tahara, Atsushi Tezuka, Tomoyuki Koike, Munemitsu Watanabe, Terumasa Tsuchiya
  • Patent number: 10804733
    Abstract: A power supply system that is mountable on a vehicle has a lead-acid storage battery connected to an electrical load, a lithium-ion storage battery having different charge and discharge characteristics form the lead-acid storage battery, and connected in parallel with the lead-acid storage battery with respect to the electrical load, a power generator configured to charge the lead-acid storage battery and the lithium-ion storage battery, and a controller configured to drive the power generator based on a relationship between a discharge current of the lead-acid storage battery and a discharge current of the lithium-ion storage battery.
    Type: Grant
    Filed: January 10, 2017
    Date of Patent: October 13, 2020
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tomoyuki Koike, Akifumi Koishi, Masahiko Tahara, Munemitsu Watanabe, Atsushi Tezuka, Terumasa Tsuchiya
  • Patent number: 10784697
    Abstract: A vehicle power supply control method includes switching, when a constant voltage is required of a power supply circuit in generating electric power by a power generator, the power supply circuit being connected to a primary storage battery and configured to be connected to a secondary storage battery that has a lower internal resistance than that of the primary storage battery, between connection of the secondary storage battery to the power supply circuit and disconnection of the secondary storage battery from the power supply circuit depending on the required constant voltage, current output to the power supply circuit by the power generator, and a state of charge of the secondary storage battery.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: September 22, 2020
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Akifumi Koishi, Masahiko Tahara, Atsushi Tezuka, Tomoyuki Koike, Munemitsu Watanabe, Terumasa Tsuchiya
  • Patent number: 10364759
    Abstract: A vehicle traveling control method includes detecting a remaining fuel amount in a fuel tank including a fuel chamber in which a suction port of a fuel pump is disposed for sucking fuel to be supplied to an engine, the fuel tank being configured to generate negative pressure for sucking fuel to the fuel chamber by ejecting a part of fuel sucked by the fuel pump into the fuel chamber via a fuel line, permitting, when a predetermined condition is satisfied, inertial traveling during which a vehicle travels, with the engine kept stopped, operating, when the detected remaining fuel amount is less than a first threshold, the fuel pump despite the engine stopped owing to the inertial traveling, and prohibiting stop of the engine when the detected remaining fuel amount is less than a second threshold smaller than the first threshold.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: July 30, 2019
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tomoyuki Koike, Munemitsu Watanabe, Akifumi Koishi, Terumasa Tsuchiya, Masahiko Tahara, Atsushi Tezuka
  • Publication number: 20190103629
    Abstract: A power supply system that is mountable on a vehicle includes a lithium-ion storage battery connected to an electrical load via two paths being a first path and a second path, a power generator capable of charging the lithium-ion storage battery, a first switch provided on the first path, an electrical resistance element provided on the second path, and a controller configured to control on/off of the power generator and perform on/off control of the first switch. According to a voltage increase request from the electrical load, the controller is configured to turn of the first switch such that a power supply to the lithium-ion storage battery through the first path from the power generator is cut.
    Type: Application
    Filed: March 13, 2017
    Publication date: April 4, 2019
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Tomoyuki Koike, Munemitsu Watanabe, Akifumi Koishi, Masahiko Tahara, Terumasa Tsuchiya, Atsushi Tezuka
  • Publication number: 20190044367
    Abstract: A power supply system that is mountable on a vehicle has a lead-acid storage battery connected to an electrical load, a lithium-ion storage battery having different charge and discharge characteristics form the lead-acid storage battery, and connected in parallel with the lead-acid storage battery with respect to the electrical load, a power generator configured to charge the lead-acid storage battery and the lithium-ion storage battery, and a controller configured to drive the power generator based on a relationship between a discharge current of the lead-acid storage battery and a discharge current of the lithium-ion storage battery.
    Type: Application
    Filed: January 10, 2017
    Publication date: February 7, 2019
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Tomoyuki KOIKE, Akifumi KOISHI, Masahiko TAHARA, Munemitsu WATANABE, Atsushi TEZUKA, Terumasa TSUCHIYA
  • Patent number: 10144373
    Abstract: A power supply system control device for controlling a power supply system including an electric generator, a first electricity storage configured to be charged with and to discharge electric power generated by the electric generator, a second electricity storage configured to be charged with and to discharge the generated electric power, two paths connecting between the first electricity storage and the second electricity storage, a switching unit including a first switch configured to switch between a conductive state and a non-conductive state of one of the paths, and a second switch configured to switch between a conductive state and a non-conductive state of the other of the paths, and an electric load of a vehicle that is connected to the first electricity storage side of the switching unit.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: December 4, 2018
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Masahiko Tahara, Terumasa Tsuchiya, Atsushi Tezuka, Tomoyuki Koike, Munemitsu Watanabe, Akifumi Koishi
  • Patent number: 10119513
    Abstract: A power supply system in a vehicle having an idling stop function for executing an automatic stop and an automatic restart on an engine has a power generator, a first storage unit that can be charged with and can discharge generated power generated by the power generator, a second storage unit that can be charged with and can discharge the generated power, two paths connecting the first storage unit and the second storage unit, a switching unit including a first switch for switching one path of the two paths between a conductive condition and a non-conductive condition, and a second switch for switching another path of the two paths between a conductive condition and a non-conductive condition, and an engine restarter connected to either the first storage unit side or the second storage unit side of the switching unit in order to start the engine during the automatic restart.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: November 6, 2018
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Masahiko Tahara, Atsushi Tezuka, Tomoyuki Koike, Munemitsu Watanabe, Akifumi Koishi, Terumasa Tsuchiya
  • Publication number: 20180290557
    Abstract: A vehicle power supply control device includes a main battery connected to a power supply circuit, a sub-battery having an internal resistance lower than an internal resistance of the main battery, an electric generator which is connected to the power supply circuit and has a controllable power generation voltage, and a connection controller configured to connect the sub-battery to the power supply circuit after adjusting a voltage on a side of the power supply circuit close to a voltage of the sub-battery by controlling the power generation voltage of the electric generator. The main battery is configured to be disconnectable from the power supply circuit. The connection controller is configured to disconnect the main battery from the power supply circuit first, then control the power generation voltage of the electric generator to adjust the power generation voltage close to the voltage of the sub-battery.
    Type: Application
    Filed: October 2, 2015
    Publication date: October 11, 2018
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Akifumi Koishi, Masahiko Tahara, Atsushi Tezuka, Tomoyuki Koike, Munemitsu Watanabe, Terumasa Tsuchiya
  • Publication number: 20180265021
    Abstract: A vehicle power supply control method includes switching, when a constant voltage is required of a power supply circuit in generating electric power by a power generator, the power supply circuit being connected to a primary storage battery and configured to be connected to a secondary storage battery that has a lower internal resistance than that of the primary storage battery, between connection of the secondary storage battery to the power supply circuit and disconnection of the secondary storage battery from the power supply circuit depending on the required constant voltage, current output to the power supply circuit by the power generator, and a state of charge of the secondary storage battery.
    Type: Application
    Filed: September 25, 2015
    Publication date: September 20, 2018
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Akifumi Koishi, Masahiko Tahara, Atsushi Tezuka, Tomoyuki Koike, Munemitsu Watanabe, Terumasa Tsuchiya
  • Publication number: 20180245525
    Abstract: A vehicle traveling control method includes detecting a remaining fuel amount in a fuel tank including a fuel chamber in which a suction port of a fuel pump is disposed for sucking fuel to be supplied to an engine, the fuel tank being configured to generate negative pressure for sucking fuel to the fuel chamber by ejecting a part of fuel sucked by the fuel pump into the fuel chamber via a fuel line, permitting, when a predetermined condition is satisfied, inertial traveling during which a vehicle travels, with the engine kept stopped, operating, when the detected remaining fuel amount is less than a first threshold, the fuel pump despite the engine stopped owing to the inertial traveling, and prohibiting stop of the engine when the detected remaining fuel amount is less than a second threshold smaller than the first threshold.
    Type: Application
    Filed: August 20, 2015
    Publication date: August 30, 2018
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Tomoyuki Koike, Munemitsu Watanabe, Akifumi Koishi, Terumasa Tsuchiya, Masahiko Tahara, Atsushi Tezuka
  • Publication number: 20180147915
    Abstract: A vehicle air-conditioning system that performs air heating by utilizing heat of a coolant that cools an engine includes a circulation flow passage connecting a coolant inflow portion and a coolant discharge portion of the engine, a heating heater core disposed in the circulation flow passage, a radiator disposed in the circulation flow passage, a radiator fan configured to supply an air to the radiator, and a controller configured to control the radiator fan. When a water pump configured to pressure-feed the coolant is stopped during automatic stop of the engine, the controller drives to rotate the radiator fan during automatic stop of the engine so as to let convection take place in the coolant in the radiator and supply the coolant to the heating heater core.
    Type: Application
    Filed: May 28, 2015
    Publication date: May 31, 2018
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Atsushi Tezuka, Masahiko Tahara, Tomoyuki Koike, Munemitsu Watanabe, Terumasa Tsuchiya, Akifumi Koishi
  • Publication number: 20180134240
    Abstract: A power supply system control device for controlling a power supply system including an electric generator, a first electricity storage configured to be charged with and to discharge electric power generated by the electric generator, a second electricity storage configured to be charged with and to discharge the generated electric power, two paths connecting between the first electricity storage and the second electricity storage, a switching unit including a first switch configured to switch between a conductive state and a non-conductive state of one of the paths, and a second switch configured to switch between a conductive state and a non-conductive state of the other of the paths, and an electric load of a vehicle that is connected to the first electricity storage side of the switching unit.
    Type: Application
    Filed: May 22, 2015
    Publication date: May 17, 2018
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Masahiko Tahara, Terumasa Tsuchiya, Atsushi Tezuka, Tomoyuki Koike, Munemitsu Watanabe, Akifumi Koishi
  • Publication number: 20180126856
    Abstract: A power supply system in a vehicle having an idling stop function for executing an automatic stop and an automatic restart on an engine has a power generator, a first storage unit that can be charged with and can discharge generated power generated by the power generator, a second storage unit that can be charged with and can discharge the generated power, two paths connecting the first storage unit and the second storage unit, a switching unit including a first switch for switching one path of the two paths between a conductive condition and a non-conductive condition, and a second switch for switching another path of the two paths between a conductive condition and a non-conductive condition, and an engine restarter connected to either the first storage unit side or the second storage unit side of the switching unit in order to start the engine during the automatic restart.
    Type: Application
    Filed: May 12, 2015
    Publication date: May 10, 2018
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Masahiko Tahara, Atsushi Tezuka, Tomoyuki Koike, Munemitsu Watanabe, Akifumi Koishi, Terumasa Tsuchiya
  • Patent number: 9944199
    Abstract: An electric circuit used in a vehicle having an idling stop function of automatically stopping and automatically restarting an engine includes an electric generator, a first electricity storage capable of charging and discharging electric power generated by the electric generator, a second electricity storage connected in parallel to the first electricity storage, capable of charging and discharging the generated electric power, and having high durability against repetitive charge and discharge compared to the first electricity storage, an engine restarter, which is connected to the first electricity storage and the second electricity storage, configured to crank the engine at a time of the automatic restart, and a switch, which is connected between the engine restarter and the first electricity storage, configured to block a flow of current between the engine restarter and the first electricity storage. The switch includes at least a semiconductor switch.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: April 17, 2018
    Assignee: NISSAN MOTOR CO., LTD.
    Inventor: Masahiko Tahara