Patents by Inventor Kazuya Arakawa

Kazuya Arakawa 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: 20170187315
    Abstract: A control device for a switched reluctance motor includes: a switching controller configured to execute switching control to switch drive control of the switched reluctance motor between a first control mode for reducing torque fluctuations and a second control mode for reducing fluctuations of a radial force based on rotational speed and a torque of the switched reluctance motor; a first controller configured to execute first control to cause an excitation current with a current waveform for reducing the torque fluctuations to flow through the coils; and a second controller configured to execute second control to cause an excitation current with a current waveform for reducing the radial force fluctuations to flow through the coils.
    Type: Application
    Filed: December 20, 2016
    Publication date: June 29, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Jun-ichi DEGUCHI, Kazuya ARAKAWA, Kensuke YOSHIZUE, Nobukazu HOSHI, Keiichi SHIBUYA, Yusuke KOBAYASHI
  • Publication number: 20170175612
    Abstract: An cooling system including an oil circulation circuit includes a first circuit including an electric oil pump that discharges oil as a coolant to be supplied to an inverter and respective motors, and an HV radiator that cools the oil to be supplied to the inverter and the respective motors, and a second circuit including a mechanical oil pump that discharges the oil to be supplied to a lubrication-required part without passing through the HV radiator.
    Type: Application
    Filed: December 21, 2016
    Publication date: June 22, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke TOKOZAKURA, Kazuya ARAKAWA, Takahiro SHIINA
  • Publication number: 20170144532
    Abstract: A cooling apparatus for a hybrid vehicle is provided with an oil circulating circuit supplying oil discharged from an electric oil pump to a first motor, a second motor, an inverter, and a lubrication-required part, and the oil circulating circuit includes: a first circuit supplying the oil that is discharged from the electric oil pump, and is cooled by an HV radiator to the inverter, the first motor, and the second motor; and a second circuit supplying the oil that is discharged from the electric oil pump without being cooled by the HV radiator to the lubrication-required part.
    Type: Application
    Filed: November 21, 2016
    Publication date: May 25, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke TOKOZAKURA, Kazuya ARAKAWA, Takahiro SHllNA
  • Publication number: 20170126078
    Abstract: A switched reluctance motor include: a stator; a case in which the stator is accommodated; a rotor disposed inward of the stator in the radial direction of the switched reluctance motor; and a holding member fixed to the case. The holding member is configured to hold the stator with the stator spaced apart from an inner peripheral surface of the case. The holding member includes a holding portion and a fixed portion. The holding portion is configured to hold the stator from the outside in the radial direction. The holding portion is spaced apart from the inner peripheral surface of the case. The fixed portion is fixed to the case.
    Type: Application
    Filed: June 9, 2015
    Publication date: May 4, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kensuke YOSHIZUE, Kazuya ARAKAWA, Junichi DEGUCHI, Masahide UEMURA
  • Patent number: 9641118
    Abstract: A vehicular control apparatus that includes a switched reluctance motor and an electronic control unit is provided. The switched reluctance motor has a rotor and a stator and is mounted as a travel drive source in a vehicle. The electronic control unit executes current control of the switched reluctance motor. The electronic control unit executes first current control for causing the rotor to rotate in a reverse direction from a rotational direction in which the vehicle is started in the case where the vehicle is not started even when the switched reluctance motor outputs maximum torque within an allowable range, and executes control for causing the rotor to rotate in the rotational direction in which the vehicle is started after the rotor rotates in the reverse direction by the first current control to a rotation position at which torque for enabling a start of the vehicle can be output.
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: May 2, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Junichi Deguchi, Kazuya Arakawa, Kensuke Yoshizue
  • Publication number: 20170037954
    Abstract: A heat exchanging device includes: a heat exchanger configured to perform heat exchange between first operating oil used in an engine and second operating oil used in a fluid transmitting device and an automatic transmission; and a heat exchanging amount decreasing unit configured to, when a temperature of the second operating oil is lower than a predetermined temperature at which it is allowed to engage a lock-up mechanism, decrease a flow amount of at least one of the first and second operating oil flowing in the heat exchanger as compared to a case in which the temperature of the second operating oil is not lower than the predetermined temperature.
    Type: Application
    Filed: June 29, 2016
    Publication date: February 9, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takahiro SHIINA, Daisuke TOKOZAKURA, Kazuya ARAKAWA
  • Publication number: 20170030254
    Abstract: A heat exchanger includes: a first flow passage for an engine coolant; a second flow passage for an engine oil; a third flow passage for a transmission oil; and plural plates that partition the first, the second and the third flow passage. The first flow passage is configured to allow the engine coolant to be heat-exchanged with both the engine oil and the transmission oil via the plates. The second flow passage is arranged in the same layer with the third flow passage. The first flow passage is arranged in a different layer from the layer of the second and the third flow passage. The third flow passage is disposed on an upstream side and second flow passage is disposed on a downstream side in a flow direction of the engine coolant in the first flow passage.
    Type: Application
    Filed: July 25, 2016
    Publication date: February 2, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke TOKOZAKURA, Kazuya ARAKAWA, Takahiro SHIINA
  • Publication number: 20170030253
    Abstract: A heat exchanger includes first, second, third, and fourth passages. Engine coolant flows through the first passages. Engine oil flows through the second passages. Transmission oil flows through the fourth passages after flows through the third passages. Each first passage and each third passage is disposed in the same layer. Each second passage and each fourth passage is disposed in the same layer. Each first and each third passage are disposed in a different layer from the layer of each second and each fourths flow passage. Each fourth passage is disposed upstream of a first flow direction of the engine coolant in each first passage, and each second passage is disposed downstream of the first flow direction. Each third passage is disposed upstream of a second flow direction of the engine oil in each second passage, and each first passage is disposed downstream of the second flow direction.
    Type: Application
    Filed: July 22, 2016
    Publication date: February 2, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke TOKOZAKURA, Kazuya ARAKAWA, Takahiro SHIINA
  • Publication number: 20170030255
    Abstract: A heat exchanger includes a plurality of plates that is stacked together to constitute first flow passages, second flow passage, third flow passage, fourth flow passage and fifth flow passage. An engine coolant flows through the first flow passages. An engine oil flows through the second flow passages and fourth flow passages. A transmission oil flows through the third flow passages and fifth flow passages. Triple-flow-passage arrangement layers in each of which each first, second, and third flow passages are disposed, and dual-flow-passage arrangement layers in each of which each fourth and fifth flow passages are disposed are alternately arranged such that flow passages of each same type are not overlaid with one another in a stacking direction of the plates.
    Type: Application
    Filed: July 26, 2016
    Publication date: February 2, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke TOKOZAKURA, Kazuya Arakawa, Takahiro Shiina
  • Patent number: 9515596
    Abstract: A switched reluctance motor includes: a stator provided with a plurality of stator teeth as salient poles in a radial fashion with winding wire wound around each of the plurality of stator teeth; a rotor provided with a plurality of rotor teeth as salient poles in a radial fashion; a driving circuit configured to apply a current to the winding wire for each phase; and a control device configured to control the driving circuit, the control device being configured to perform: starting rising of a current to the winding wire of a stator tooth of a phase being a non-excitation target due to stop of energization to the winding wire; and allowing the current applied to the winding wire of the stator tooth of a phase being an excitation target to fall.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: December 6, 2016
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, TOKYO UNIVERSITY OF SCIENCE FOUNDATION
    Inventors: Jun-ichi Deguchi, Kazuya Arakawa, Kensuke Yoshizue, Nobukazu Hoshi, Noboru Nakayama, Takuya Iguchi
  • Patent number: 9506558
    Abstract: A vehicle control system to prevent a vehicle stopped in the autonomous mode from being started undesirably is provided. The vehicle control system is configured to select an operating mode from an autonomous mode and a manual mode, and to select a drive range from a drivable range and a non-drivable range. A controller is configured to detect a fact that a door is opened, that a door lock is unlocked, or that a seatbelt is unfastened. If at least any of those facts is detected, the controller shifts the drive range to the non-drivable range or shifts the operating mode to the manual mode.
    Type: Grant
    Filed: April 6, 2016
    Date of Patent: November 29, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tadashi Fujiyoshi, Kazumi Hoshiya, Yoshio Ito, Norimi Asahara, Seiji Kuwahara, Takahito Endo, Kazuya Arakawa
  • Publication number: 20160304124
    Abstract: A vehicle control system is provided to propel a vehicle in a stabilized manner when switching an operating mode from an autonomous mode to a manual mode. The vehicle control system is configured to: control an operating condition of the vehicle; determine an execution of steering operation by the driver; and continue the autonomous control of the steering wheel if the steering wheel cannot be operated by the driver when the autonomous control of the vehicle is interrupted by a manual operation of a driver and hence the operating mode is switched from the autonomous mode to the manual mode.
    Type: Application
    Filed: April 7, 2016
    Publication date: October 20, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tadashi FUJIYOSHI, Kazumi HOSHIYA, Yoshio ITO, Norimi ASAHARA, Seiji KUWAHARA, Takahito ENDO, Kazuya ARAKAWA
  • Patent number: 9473061
    Abstract: A switched reluctance motor includes: a stator provided with a plurality of stator teeth as salient poles in a radial fashion with winding wire wound around each of the plurality of stator teeth; a rotor provided with a plurality of rotor teeth as salient poles in a radial fashion; a driving circuit configured to apply a current to the winding wire for each phase; and a control device configured to control the driving circuit, the control device being configured to perform: starting rising of a current to the winding wire of a stator tooth of a phase being a non-excitation target due to stop of energization to the winding wire; and allowing the current applied to the winding wire of the stator tooth of a phase being an excitation target to fall.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: October 18, 2016
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, TOKYO UNIVERSITY OF SCIENCE FOUNDATION
    Inventors: Jun-ichi Deguchi, Kazuya Arakawa, Kensuke Yoshizue, Nobukazu Hoshi, Noboru Nakayama, Takuya Iguchi
  • Publication number: 20160298758
    Abstract: A vehicle control system to prevent a vehicle stopped in the autonomous mode from being started undesirably is provided. The vehicle control system is configured to select an operating mode from an autonomous mode and a manual mode, and to select a drive range from a drivable range and a non-drivable range. A controller is configured to detect a fact that a door is opened, that a door lock is unlocked, or that a seatbelt is unfastened. If at least any of those facts is detected, the controller shifts the drive range to the non-drivable range or shifts the operating mode to the manual mode.
    Type: Application
    Filed: April 6, 2016
    Publication date: October 13, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tadashi FUJIYOSHI, Kazumi HOSHIYA, Yoshio ITO, Norimi ASAHARA, Seiji KUWAHARA, Takahito ENDO, Kazuya ARAKAWA
  • Publication number: 20160245392
    Abstract: A lubrication structure includes a liquid drop splashing device and an electret portion. The liquid drop splashing device is configured to turn a lubricating liquid for lubricating machine-element components into liquid drops. The liquid drop splashing device is configured to splash the lubricating liquid turned into the liquid drops. The machine-element components configure contact parts. Each contact part is a part where corresponding adjacent machine-element components come into contact with each other. An electret portion is provided to a vicinity of each contact part. The electret portion is composed of an electret.
    Type: Application
    Filed: February 18, 2016
    Publication date: August 25, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keisuke ICHIGE, Masanori IRITANI, Hitoshi TAKAYAMA, Takahiro SHllNA, Daisuke TOKOZAKURA, Satoshi TOMINAGA, Kazuya ARAKAWA
  • Publication number: 20160223274
    Abstract: A heat exchanger includes: a first flow passage where first liquid flows; a second flow passage where second liquid flows; and a heat exchanger main body configured to exchange heat between the first liquid and the second liquid. The heat exchanger main body includes a cross-sectional area adjuster configured to change a flow passage cross-sectional area of at least one of the first flow passage and the second flow passage by thermal deformation. The cross-sectional area adjuster adjusts a value of the flow passage cross-sectional area in a low temperature range to be larger than a value of the flow passage cross-sectional area in a high temperature range.
    Type: Application
    Filed: December 27, 2015
    Publication date: August 4, 2016
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Satoshi TOMINAGA, Daisuke TOKOZAKURA, Takahiro SHllNA, Kazuya ARAKAWA, Hitoshi TAKAYAMA, Keisuke ICHIGE, Masanori IRITANI
  • Publication number: 20160211788
    Abstract: A vehicular control apparatus that includes a switched reluctance motor and an electronic control unit is provided. The switched reluctance motor has a rotor and a stator and is mounted as a travel drive source in a vehicle. The electronic control unit executes current control of the switched reluctance motor. The electronic control unit executes first current control for causing the rotor to rotate in a reverse direction from a rotational direction in which the vehicle is started in the case where the vehicle is not started even when the switched reluctance motor outputs maximum torque within an allowable range, and executes control for causing the rotor to rotate in the rotational direction in which the vehicle is started after the rotor rotates in the reverse direction by the first current control to a rotation position at which torque for enabling a start of the vehicle can be output.
    Type: Application
    Filed: January 12, 2016
    Publication date: July 21, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Junichi DEGUCHI, Kazuya ARAKAWA, Kensuke YOSHIZUE
  • Publication number: 20160047457
    Abstract: A shaft supporting structure of a belt-driven continuously variable transmission for reducing a length of a shaft on which a torque cam is mounted is provided. A first bearing is interposed between an outer circumferential face of the rotary shaft and an inner circumferential face of the torque cam to support those members while allowing relative rotation therebetween. A second bearing is situated radially outside of the first bearing to support one of axial ends of the output member while allowing the output member to rotate relatively with a casing. A sealing member is fitted onto the torque cam to be interposed between an outer circumferential face of the torque cam and the second bearing.
    Type: Application
    Filed: December 4, 2013
    Publication date: February 18, 2016
    Applicant: Toyota Jidosha Kabushiki kaisha
    Inventors: Motoki TABUCHI, Naoyuki SHIBATA, Akira IJICHI, Kazuya ARAKAWA
  • Publication number: 20160043681
    Abstract: A switched reluctance motor includes: a stator provided with a plurality of stator teeth as salient poles in a radial fashion with winding wire wound around each of the plurality of stator teeth; a rotor provided with a plurality of rotor teeth as salient poles in a radial fashion; a driving circuit configured to apply a current to the winding wire for each phase; and a control device configured to control the driving circuit, the control device being configured to perform: starting rising of a current to the winding wire of a stator tooth of a phase being a non-excitation target due to stop of energization to the winding wire; and allowing the current applied to the winding wire of the stator tooth of a phase being an excitation target to fall.
    Type: Application
    Filed: July 17, 2015
    Publication date: February 11, 2016
    Applicants: Toyota Jidosha Kabushiki Kaisha, Tokyo University of Science Foundation
    Inventors: Jun-ichi DEGUCHI, Kazuya ARAKAWA, Kensuke YOSHIZUE, Nobukazu HOSHI, Noboru NAKAYAMA, Takuya IGUCHI
  • Publication number: 20150340921
    Abstract: An electric power tool comprises: a motor configured to drive a tool; a control unit configured to control the motor; a communication board comprising an antenna and a communication circuit, which are configured to establish close-proximity wireless communication with an external communication terminal; and a housing configured to house the motor, the control unit, and the communication board. The housing comprises a grip portion having a hollow space, which is to be gripped by a user. The communication board is arranged inside the grip portion.
    Type: Application
    Filed: May 13, 2015
    Publication date: November 26, 2015
    Applicant: MAKITA CORPORATION
    Inventors: Hidekazu SUDA, Masaaki FUKUMOTO, Kenta EGUCHI, Kazuya ARAKAWA, Takuya KUSAKAWA