Patents by Inventor Nobuaki Yokoyama

Nobuaki Yokoyama 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: 20210036645
    Abstract: A control method of inverter for driving motor including a magnet, comprises detecting a rotation state of the motor by a rotation sensor, detecting current of the motor by a current sensor, calculating, based on a torque command value, a detection value of the rotation state detected by the rotation sensor, and detection current detected by the current sensor, a voltage command value for controlling a voltage of the motor by a controller for controlling the inverter, specifying a value of at least one of a local maximum value, a local minimum value, and an average value of the torque voltage command value included in the voltage command value as a torque determination target command value by the controller, comparing a demagnetizing determination threshold value with the torque determination target command value by the controller, and determining whether or not demagnetization of the magnet occurs in accordance with the compared result.
    Type: Application
    Filed: January 26, 2018
    Publication date: February 4, 2021
    Applicant: Nissan Motor Co., Ltd.
    Inventor: Nobuaki Yokoyama
  • Patent number: 10894471
    Abstract: A mounting structure for a power conversion device includes: a vehicle body component extending in a front-rear direction of a vehicle; a mounting component provided on the vehicle body component; a drive unit held by the vehicle body component via the mounting component; and a power conversion device attached to the mounting component. A stiffness of the mounting component is greater than a stiffness of the vehicle body component. The power conversion device is arranged between a front end and a rear end of the drive unit in a side view of the vehicle.
    Type: Grant
    Filed: May 25, 2016
    Date of Patent: January 19, 2021
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Nobuaki Yokoyama, Mikio Nozaki, Hiroki Wada, Takahiro Kurosawa, Takeshi Hamamoto, Anna Hayashi, Tomoya Kamada, Takashi Yoshikawa
  • Patent number: 10680488
    Abstract: A drive device of the present invention includes: an electric motor including a cooling channel; a power conversion unit that converts electric power from a power supply and outputs electric power to be supplied to the electric motor; and a supporting member fixed to the electric motor with the power conversion unit mounted on the supporting member. The supporting member includes a cooling channel connected to the cooling channel of the electric motor.
    Type: Grant
    Filed: May 20, 2015
    Date of Patent: June 9, 2020
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Nobuaki Yokoyama, Hirofumi Shimizu
  • Publication number: 20190337374
    Abstract: A mounting structure for a power conversion device includes: a vehicle body component extending in a front-rear direction of a vehicle; a mounting component provided on the vehicle body component; a drive unit held by the vehicle body component via the mounting component; and a power conversion device attached to the mounting component. A stiffness of the mounting component is greater than a stiffness of the vehicle body component. The power conversion device is arranged between a front end and a rear end of the drive unit in a side view of the vehicle.
    Type: Application
    Filed: May 25, 2016
    Publication date: November 7, 2019
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Nobuaki YOKOYAMA, Mikio NOZAKI, Hiroki WADA, Takahiro KUROSAWA, Takeshi HAMAMOTO, Anna HAYASHI, Tomoya KAMADA, Takashi YOSHIKAWA
  • Publication number: 20180159403
    Abstract: A drive device of the present invention includes: an electric motor including a cooling channel; a power conversion unit that converts electric power from a power supply and outputs electric power to be supplied to the electric motor; and a supporting member fixed to the electric motor with the power conversion unit mounted on the supporting member. The supporting member includes a cooling channel connected to the cooling channel of the electric motor.
    Type: Application
    Filed: May 20, 2015
    Publication date: June 7, 2018
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Nobuaki YOKOYAMA, Hirofumi SHIMIZU
  • Patent number: 9859810
    Abstract: A power converter (30) comprising components of a power converter circuit, the components including switching elements (31 to 36), smoothing capacitors (37 to 39), and circuit boards (66 and 67) on which drive circuit parts for driving the switching elements are mounted, wherein the components are housed in a case (65), input power is converted and output through high-voltage terminals (69 to 79), and the high-voltage terminals (69 to 79) and the circuit boards (66 and 67) are provided in a common plane area (E).
    Type: Grant
    Filed: August 7, 2014
    Date of Patent: January 2, 2018
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Nobuaki Yokoyama, Kazuhiro Hayakawa, Takaya Ishii
  • Patent number: 9566851
    Abstract: A mounting structure of a high voltage unit for an electric vehicle includes a first high voltage unit that has vehicle body fixing parts to be fixed to a vehicle body at both ends in a width direction, and a second high voltage unit that is arranged on an upper side of the first high voltage unit in a vertical direction of the vehicle, in which, in the second high voltage unit, a high voltage heavy component included in the second high voltage unit is arranged closer to a lowermost surface in the vertical direction of the vehicle.
    Type: Grant
    Filed: September 17, 2013
    Date of Patent: February 14, 2017
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Tomoki Kawamura, Hirofumi Shimizu, Nobuaki Yokoyama, Izuho Hirano
  • Publication number: 20160294301
    Abstract: A power converter (30) comprising components of a power converter circuit, the components including switching elements (31 to 36), smoothing capacitors (37 to 39), and circuit boards (66 and 67) on which drive circuit parts for driving the switching elements are mounted, wherein the components are housed in a case (65), input power is converted and output through high-voltage terminals (69 to 79), and the high-voltage terminals (69 to 79) and the circuit boards (66 and 67) are provided in a common plane area (E).
    Type: Application
    Filed: August 7, 2014
    Publication date: October 6, 2016
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Nobuaki YOKOYAMA, Kazuhiro HAYAKAWA, Takaya ISHII
  • Patent number: 9370994
    Abstract: Disclosed is an integrated power electric unit mounted on an electric vehicle, comprising a first power electric unit, a second power electric unit arranged over the first power electric unit in a vertical direction of the vehicle, a channel that connects the first and second power electric units so as to flow the air, and a breather provided in the second power electric unit to cause inner and outer sides of the second power electric unit to communicate with each other.
    Type: Grant
    Filed: July 8, 2013
    Date of Patent: June 21, 2016
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Nobuaki Yokoyama, Tomoki Kawamura, Tatsuya Shindou, Takenari Okuyama, Takeo Ishizaki
  • Patent number: 9260020
    Abstract: A power converter configured to be mounted on an electrically driven vehicle comprises a control board that controls a power module including a semiconductor device, a connector provided on the control board so as to be connected to an external controller, a strong electric component arranged so as to overlap the control board, and a housing that houses the control board and the strong electric component. A bottom portion of the housing is formed to swell in a convex-shaped manner, a part of the strong electric component is housed in an area of the housing that swells in the convex-shaped manner, and the strong electric component is formed so that a projection area thereof to the overlappingly arranged control board is smaller than a surface area of the control board. The connector is arranged in an area of the control board broader than a projection plane of the overlappingly arranged strong electric component to the control board.
    Type: Grant
    Filed: July 19, 2013
    Date of Patent: February 16, 2016
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Takaya Ishii, Nobuaki Yokoyama
  • Publication number: 20150273994
    Abstract: A mounting structure of a high voltage unit for an electric vehicle includes a first high voltage unit that has vehicle body fixing parts to be fixed to a vehicle body at both ends in a width direction, and a second high voltage unit that is arranged on an upper side of the first high voltage unit in a vertical direction of the vehicle, in which, in the second high voltage unit, a high voltage heavy component included in the second high voltage unit is arranged closer to a lowermost surface in the vertical direction of the vehicle.
    Type: Application
    Filed: September 17, 2013
    Publication date: October 1, 2015
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Tomoki Kawamura, Hirofumi Shimizu, Nobuaki Yokoyama, Izuho Hirano
  • Publication number: 20150231975
    Abstract: A power converter configured to be mounted on an electrically driven vehicle comprises a control board that controls a power module including a semiconductor device, a connector provided on the control board so as to be connected to an external controller, a strong electric component arranged so as to overlap the control board, and a housing that houses the control board and the strong electric component. A bottom portion of the housing is formed to swell in a convex-shaped manner, a part of the strong electric component is housed in an area of the housing that swells in the convex-shaped manner, and the strong electric component is formed so that a projection area thereof to the overlappingly arranged control board is smaller than a surface area of the control board. The connector is arranged in an area of the control board broader than a projection plane of the overlappingly arranged strong electric component to the control board.
    Type: Application
    Filed: July 19, 2013
    Publication date: August 20, 2015
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Takaya Ishii, Nobuaki Yokoyama
  • Publication number: 20150210157
    Abstract: Disclosed is an integrated power electric unit mounted on an electric vehicle, comprising a first power electric unit, a second power electric unit arranged over the first power electric unit in a vertical direction of the vehicle, a channel that connects the first and second power electric units so as to flow the air, and a breather provided in the second power electric unit to cause inner and outer sides of the second power electric unit to communicate with each other.
    Type: Application
    Filed: July 8, 2013
    Publication date: July 30, 2015
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Nobuaki Yokoyama, Tomoki Kawamura, Tatsuya Shindou, Takenari Okuyama, Takeo Ishizaki
  • Patent number: 7415255
    Abstract: With the objective of providing a scanning receiver capable of capturing a target radio wave in an extremely short period of time by use of a simple constituting means, a plurality of wide frequency division bands in which a full frequency range is divided into predetermined frequency ranges are set and the field intensities of received radio waves are retrieved using the output of an intermediate frequency amplifier circuit over the set wide frequency division bands in order. Further, when a received radio wave having a field intensity greater than or equal to a prescribed level is obtained upon the above retrieval, receive frequencies are swept from one end of each of the wide frequency division bands to the other end thereof. When a target radio wave can be captured upon the above sweeping, transition to the operation of receiving the target radio wave is performed.
    Type: Grant
    Filed: March 2, 2005
    Date of Patent: August 19, 2008
    Assignee: General Research of Electronics, Inc.
    Inventors: Kiyoshi Wakui, Nobuaki Yokoyama, Kazuo Kawai
  • Publication number: 20070281618
    Abstract: The present invention provides a transmitter-receiver for short-range wireless transmission, which comprises a frequency scan signal receiving section that searches a vacant channel frequency by frequency scanning of a receiving wave, and a signal transmitting section that transmits a transmitting wave using the searched vacant channel frequency. The frequency scan signal receiving section sequentially changes a frequency of a PLL oscillator by control of a controller to thereby search the presence or absence of a receive frequency lying in a predetermined frequency band depending on an output state of a carrier detector. When the controller detects a vacant channel frequency, the frequency scan signal receiving section fixes the oscillation frequency of the PLL oscillator to an oscillation frequency corresponding to the vacant channel frequency and supplies the fixed oscillation frequency to the signal transmitting section.
    Type: Application
    Filed: June 1, 2007
    Publication date: December 6, 2007
    Applicant: GENERAL RESEARCH OF ELECTRONICS, INC.
    Inventor: Nobuaki Yokoyama
  • Publication number: 20060133453
    Abstract: The present invention provides a data transfer system that performs a data transfer between a master receiver and at least one slave receiver each of which has a built-in memory storing data therein and is identical in configuration. Upon the data transfer, such at least one slave receiver in which the data transfer is performed, is disposed in the neighborhood of the master receiver. The master receiver FSK-modulates a local oscillation signal of a first local oscillator and a standard frequency signal of a standard signal generator using the data read from the corresponding built-in memory, and radiates the first local oscillation signal generated from the first local oscillator into the air as a leakage radio wave, whereas such at least one slave receiver receives the leakage radio wave therein and writes data acquired from the received signal into the corresponding built-in memory, whereby a data transfer is performed between the master receiver and the slave receiver.
    Type: Application
    Filed: August 11, 2005
    Publication date: June 22, 2006
    Inventor: Nobuaki Yokoyama
  • Publication number: 20060057986
    Abstract: With the objective of providing a scanning receiver capable of capturing a target radio wave in an extremely short period of time by use of a simple constituting means, a plurality of wide frequency division bands in which a full frequency range is divided into predetermined frequency ranges are set and the field intensities of received radio waves are retrieved using the output of an intermediate frequency amplifier circuit over the set wide frequency division bands in order. Further, when a received radio wave having a field intensity greater than or equal to a prescribed level is obtained upon the above retrieval, receive frequencies are swept from one end of each of the wide frequency division bands to the other end thereof. When a target radio wave can be captured upon the above sweeping, transition to the operation of receiving the target radio wave is performed.
    Type: Application
    Filed: March 2, 2005
    Publication date: March 16, 2006
    Applicant: General Research of Electronics, Inc.
    Inventors: Kiyoshi Wakui, Nobuaki Yokoyama, Kazuo Kawai
  • Patent number: 6968165
    Abstract: A frequency scanning receiver minimizes the time needed for setting the frequency of a phased lock loop of a first local oscillator. The frequency scanning receiver is configured so that when the reference frequency of the PLL of the first local oscillator has been set at a high frequency, and the frequency error is less than the second IF, the frequency error is controlled to be zero by the control circuit switching the frequency of a second local oscillator or third local oscillator to an appropriate frequency using an output of a frequency discriminator.
    Type: Grant
    Filed: April 22, 2002
    Date of Patent: November 22, 2005
    Assignee: General Research of Electronics, Inc.
    Inventors: Sadanori Shitara, Kiyoshi Wakui, Nobuaki Yokoyama
  • Patent number: 6965222
    Abstract: A current controller includes a pulse width modulation signal outputting circuit, a saw-tooth-wave signal generating circuit, a command value smoothing circuit, a detection value amplifying circuit, a deviation integrating circuit, and a current controlling circuit. The current controlling circuit controls a current caused to flow through a solenoid on the basis of a saw-tooth-wave signal having the same period as that of a pulse width modulation signal, and a detection signal generated by the deviation integrating circuit.
    Type: Grant
    Filed: February 23, 2004
    Date of Patent: November 15, 2005
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Nobuaki Yokoyama, Minoru Abe
  • Publication number: 20040178782
    Abstract: A current controller includes a pulse width modulation signal outputting circuit, a saw-tooth-wave signal generating circuit, a command value smoothing circuit, a detection value amplifying circuit, a deviation integrating circuit, and a current controlling circuit. The current controlling circuit controls a current caused to flow through a solenoid on the basis of a saw-tooth-wave signal having the same period as that of a pulse width modulation signal, and a detection signal generated by the deviation integrating circuit.
    Type: Application
    Filed: February 23, 2004
    Publication date: September 16, 2004
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Nobuaki Yokoyama, Minoru Abe