Patents by Inventor Tatsuya Okuda

Tatsuya Okuda 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).

  • Publication number: 20200295674
    Abstract: A power conversion device which reduces switching losses and stabilizes the output power. A switching-mode changer generates a reference signal for switching a mode of operation of the full-bridge circuit to a first switching mode or a second switching mode. In the first switching mode, an upper arm and a lower arm are switched synchronously, and a lower arm and an upper arm are non-conducting. In the second switching mode, the lower arm and the upper arm are switched synchronously, and the upper arm and the lower arm are non-conducting. The switching-mode changer adjusts the phase of the reference signal so that the reactive power is reduced.
    Type: Application
    Filed: September 20, 2018
    Publication date: September 17, 2020
    Applicants: Mitsubishi Electric Corporation, National University Corporation Nagaoka University of Technology
    Inventors: Yu KAWAI, Tatsuya OKUDA, Jun-ichi ITOH, Hoai Nam LE
  • Publication number: 20200263024
    Abstract: The present invention improves the long-term storage stability of an organoborane-Lewis base complex. First composite particles of the present invention include particles of an organic polymer (B), and an organoborane-Lewis base complex (A) contained in the particles. Second composite particles of the present invention include particles of an inorganic compound (B?), and an organoborane-Lewis base complex (A) adsorbed on the particles.
    Type: Application
    Filed: September 29, 2017
    Publication date: August 20, 2020
    Applicant: SUN MEDICAL CO., LTD.
    Inventors: Yuya YAMAMOTO, Tatsuya ORI, Tamaki OTSUKI, Asami OKUDA, Akari YAMAMOTO
  • Publication number: 20200233407
    Abstract: An apparatus including a combination possibility calculation unit to calculate a stable orientation in which, from three-dimensional shape data of a part, the part is stabilized on a flat surface, to calculate a grasping method for grasping the part with a hand, and to calculate a combination in which the hand does not interfere from system configuration data including information on a connection destination of the hand and a combination group of the grasping method and the stable orientation; a regrasping path calculation unit to calculate a regrasping path of the part by using the calculated combination; a path group calculation unit to calculate a path having the minimum number of teaching points from the regrasping path as a path group based on orientation data for designating an input orientation and an alignment orientation of the part; and a program generation unit to generate a program of a robot based on the path group.
    Type: Application
    Filed: September 4, 2017
    Publication date: July 23, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tatsuya NAGATANI, Haruhisa OKUDA
  • Patent number: 10676076
    Abstract: A control device includes an electronic control unit configured to selectively execute traveling in a first traveling mode and traveling in a second traveling mode, the first traveling mode being a traveling mode in which in a state where one engagement device is controlled so as to be engaged, a differential state is controlled by a first rotating machine to transmit torque of an engine, and the second traveling mode being a traveling mode in which in a state where the other engagement device is controlled so as to be engaged, a differential state is controlled to transmit torque of the engine, and perform switching to traveling in the second traveling mode in a case where a vehicle speed is equal to or higher than a predetermined vehicle speed when engine stop control that stops the engine is executed during traveling in the first traveling mode.
    Type: Grant
    Filed: June 20, 2018
    Date of Patent: June 9, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masafumi Yamamoto, Atsushi Tabata, Tatsuya Imamura, Koichi Okuda
  • Patent number: 10668800
    Abstract: A vehicle drive unit to prevent a single phase lock of a motor as a prime mover to limit damage is provided. The drive unit includes: a first transmission route to deliver drive force of an engine to drive wheels; and a second transmission route to deliver drive force of a motor to the drive wheels. The second transmission route comprises an intermediate shaft that transmits the drive force of the motor to the first transmission route. A fluid coupling is disposed between the motor and the intermediate shaft. A lockup clutch is arranged parallel to the fluid coupling between the motor and the intermediate shaft.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: June 2, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tatsuya Imamura, Atsushi Tabata, Koichi Okuda, Keita Imai
  • Patent number: 10625592
    Abstract: A control apparatus for a vehicular power transmitting system includes a drive mode setting portion configured to select a first reverse drive mode of the vehicle to be established with an engaging action of the first coupling element, and a required vehicle drive force determining portion configured to determine whether a degree of operation of an accelerator pedal of the vehicle during reverse driving of the vehicle is higher than a predetermined threshold value. The drive mode setting portion selects the first reverse drive mode when the required vehicle drive force determining portion has determined that the degree of operation of the accelerator pedal during the reverse driving of the vehicle is higher than the predetermined threshold value.
    Type: Grant
    Filed: September 21, 2018
    Date of Patent: April 21, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keita Imai, Koichi Okuda, Tatsuya Imamura, Atsushi Tabata
  • Publication number: 20200059103
    Abstract: A power system and a power conversion device are interconnected via an interconnection switch. A user load is provided between the power conversion device and the interconnection switch. In parallel with the interconnection switch, a series circuit composed of a load disconnection switch and a voltage maintenance load for maintaining voltage of the user load at the time of system momentary power interruption is connected. Control is performed such that, when momentary power interruption occurs, the interconnection switch is turned off and the power system and the power conversion device are connected via the voltage maintenance load, and at the time of recovery from the momentary power interruption, the interconnection switch is turned on, further the power system and the power conversion device are connected.
    Type: Application
    Filed: May 12, 2017
    Publication date: February 20, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kikuo IZUMI, Tatsuya OKUDA, Masahiro SUGAHARA
  • Patent number: 10562522
    Abstract: A control apparatus for a power transmitting system of a vehicle includes a drive mode control portion for selectively establishing one of first and second engine-braking drive modes in which a braking torque of the engine is applied to the vehicle. The first engine-braking drive mode is established in an engaged state of the first coupling device, while the second engine-braking drive mode is established in an engaged state of the second coupling device. The drive mode control portion switches the power transmitting system between the first and second engine-braking drive modes, such that the engine speed is held constant in the process of switching between the first and second engine-braking drive modes.
    Type: Grant
    Filed: September 21, 2018
    Date of Patent: February 18, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keisuke Omuro, Atsushi Tabata, Tatsuya Imamura, Koichi Okuda
  • Patent number: 10256747
    Abstract: In a control unit for drive-controlling a switching element unit of each power conversion device, a voltage correction amount calculation unit calculates a correction amount corresponding to voltage drop due to impedance between the switching element unit and filter reactor. A voltage command correcting unit corrects a voltage command generated by the voltage command generation unit, using the correction amount. Thus, for a power conversion device 21 that has a small output impedance, correction is performed so as to increase the output impedance, and a PLL unit changes the frequency in accordance with active power calculated from output voltage and output current of the power conversion device, so as to uniform power allocations.
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: April 9, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takahiro Kato, Yu Kawai, Kenji Fujiwara, Kikuo Izumi, Tatsuya Okuda
  • Publication number: 20180358907
    Abstract: In a control unit for drive-controlling a switching element unit of each power conversion device, a voltage correction amount calculation unit calculates a correction amount corresponding to voltage drop due to impedance between the switching element unit and filter reactor. A voltage command correcting unit corrects a voltage command generated by the voltage command generation unit, using the correction amount. Thus, for a power conversion device 21 that has a small output impedance, correction is performed so as to increase the output impedance, and a PLL unit changes the frequency in accordance with active power calculated from output voltage and output current of the power conversion device, so as to uniform power allocations.
    Type: Application
    Filed: November 16, 2016
    Publication date: December 13, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takahiro KATO, Yu KAWAI, Kenji FUJIWARA, Kikuo IZUMI, Tatsuya OKUDA
  • Patent number: 10084315
    Abstract: A power conversion circuit for converting DC power supplied from a DC power supply to AC power; and a power conversion control section for controlling operation of the power conversion circuit so as to generate autonomous operation power as an AC voltage source in a parallel-off state from a power grid. The power conversion control section includes: an AC voltage control section for controlling AC voltage; an AC current suppression section for limiting AC current to a predetermined current limit value or smaller; and a DC voltage shortage suppression section for, when DC voltage of the power conversion circuit reduces, in response thereto, reducing the current limit value to be given to the AC current suppression section.
    Type: Grant
    Filed: July 4, 2014
    Date of Patent: September 25, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Okuda, Kikuo Izumi, Takahiro Kato
  • Patent number: 10044282
    Abstract: Using two converters placed in a primary-side and a secondary-side and each configured as a single-phase full-bridge, and one single-phase transformer TR, a power conversion device converts DC power of a primary-side capacitor to which a primary-side DC voltage is applied, to DC power of a secondary-side capacitor to which a secondary-side DC voltage is applied, through a transformer. A control device sets a dead time Td1 for the converter serving as a power-transferring side converter, to be equal to or less than a current-polarity reversal time Tcmtt, to thereby surely achieve zero-voltage switching.
    Type: Grant
    Filed: February 24, 2016
    Date of Patent: August 7, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takushi Jimichi, Tatsuya Okuda, Osamu Mori, Takaharu Ishibashi
  • Patent number: 9912150
    Abstract: In a power control system which connects power from the power storage device to a power grid and supplies power to a load, the power from the power storage device is connected to the load and the power grid via a DC/DC converter, a smoothing capacitor, and a DC/AC converter. By a first power control unit for controlling flow power of the power grid to be a power command value, and by a second power control unit for suppressing reverse flow power, an output power command for the DC/AC converter is generated, an output power command for the DC/DC converter is generated so that voltage of the smoothing capacitor becomes target voltage, and the output power command is corrected so as to suppress voltage variation in the smoothing capacitor.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: March 6, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kikuo Izumi, Tatsuya Okuda, Tsutomu Shimazaki, Naohide Tsuchimoto
  • Publication number: 20180054136
    Abstract: Using two converters placed in a primary-side and a secondary-side and each configured as a single-phase full-bridge, and one single-phase transformer TR, a power conversion device converts DC power of a primary-side capacitor to which a primary-side DC voltage is applied, to DC power of a secondary-side capacitor to which a secondary-side DC voltage is applied, through a transformer. A control device sets a dead time Td1 for the converter serving as a power-transferring side converter, to be equal to or less than a current-polarity reversal time Tcmtt, to thereby surely achieve zero-voltage switching.
    Type: Application
    Filed: February 24, 2016
    Publication date: February 22, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takushi JIMICHI, Tatsuya OKUDA, Osamu MORI, Takaharu ISHIBASHI
  • Publication number: 20160204691
    Abstract: A power conversion circuit for converting DC power supplied from a DC power supply to AC power; and a power conversion control section for controlling operation of the power conversion circuit so as to generate autonomous operation power as an AC voltage source in a parallel-off state from a power grid. The power conversion control section includes: an AC voltage control section for controlling AC voltage; an AC current suppression section for limiting AC current to a predetermined current limit value or smaller; and a DC voltage shortage suppression section for, when DC voltage of the power conversion circuit reduces, in response thereto, reducing the current limit value to be given to the AC current suppression section.
    Type: Application
    Filed: July 4, 2014
    Publication date: July 14, 2016
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tatsuya OKUDA, Kikuo IZUMI, Takahiro KATO
  • Publication number: 20160072281
    Abstract: In a power control system which connects power from the power storage device to a power grid and supplies power to a load, the power from the power storage device is connected to the load and the power grid via a DC/DC converter, a smoothing capacitor, and a DC/AC converter. By a first power control unit for controlling flow power of the power grid to be a power command value, and by a second power control unit for suppressing reverse flow power, an output power command for the DC/AC converter is generated, an output power command for the DC/DC converter is generated so that voltage of the smoothing capacitor becomes target voltage, and the output power command is corrected so as to suppress voltage variation in the smoothing capacitor.
    Type: Application
    Filed: May 21, 2014
    Publication date: March 10, 2016
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kikuo IZUMI, Tatsuya OKUDA, Tsutomu SHIMAZAKI, Naohide TSUCHIMOTO
  • Patent number: 9007042
    Abstract: In a DC/DC converter, a first operation section calculates a first operation value, based on a difference voltage between an instruction value for a high-voltage-side voltage and a detected value of a high-voltage-side voltage, a second operation section calculates a second operation value, based on a difference voltage between a voltage instruction value for a charge-discharge capacitor and a voltage detected value of the charge-discharge capacitor, and a switching control section obtains a conduction ratio, based on the first operation value and the second operation value, and controls, based on the conduction ratio, switching operations of first to fourth semiconductor circuits, thereby controlling the high-voltage-side voltage, and the voltage of the charge-discharge capacitor.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: April 14, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Okuda, Takahiro Urakabe, Masaru Kobayashi, Matahiko Ikeda, Hirotoshi Maekawa
  • Patent number: 8982588
    Abstract: A method and apparatus for controlling the output voltage of a boost converter including a number n of bridge devices connected in series, each bridge device including plural switches and a capacitor. The method and apparatus provide control of the switches according to a selected periodical matrix pattern including a number N of time intervals, N being a positive integer greater than 2, and in that in each time interval, the voltage between the input and the output of each ith bridge device with i from one to n, is equal to one of a null value, a number ki times a positive value, and minus the number ki times the positive value, the positive value being the result of the division of the output voltage of the boost converter including the n bridge devices by the number of time intervals N of the periodical matrix pattern.
    Type: Grant
    Filed: April 22, 2010
    Date of Patent: March 17, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Gustavo Buiatti, Tomoyuki Kawakami, Tatsuya Okuda, Nicolas Voyer
  • Patent number: 8773082
    Abstract: An object of the present invention is to provide a DC/DC power conversion apparatus that can reduce the average power consumption over a wide range of DC voltage ratios. A control circuit (120) changes a switching frequency f at which IGBTs S1 to S4 perform ON/OFF operation, in accordance with a voltage ratio k (k=V2/V1) for DC voltage conversion, based on the following expressions, such that a magnitude ?I of a current ripple flowing in a reactor Lc is a predetermined constant value irrespective of the voltage ratio k.
    Type: Grant
    Filed: July 26, 2010
    Date of Patent: July 8, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takahiro Urakabe, Tatsuya Okuda, Yuuya Tanaka, Masaru Kobayashi, Matahiko Ikeda, Hirotoshi Maekawa
  • Patent number: 8754549
    Abstract: In a power conversion device which performs DC/DC conversion, an inverter circuit (20), which is formed of one or more single-phase inverters (20a) and (20b) connected in series to each other, is connected in series to a DC power supply (1) in its subsequent stage. In further subsequent stage, a smoothing capacitor (6) connected to the inverter circuit (20) via a rectifier diode (5), and a shorting switch (4) which bypasses the smoothing capacitor (6) are provided. The shorting switch (4) is switched ON to charge capacitors (25) and (35) included in the single-phase inverter (20a) and (20b), respectively, whereas the shorting switch (4) is switched OFF to discharge the capacitors (25) and (35), whereby the voltage of the smoothing capacitor (6) is controlled.
    Type: Grant
    Filed: July 23, 2009
    Date of Patent: June 17, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tomoyuki Kawakami, Akihiko Iwata, Tatsuya Okuda