Patents by Inventor Kengo Fujiwara

Kengo Fujiwara 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: 11460425
    Abstract: Provided is a thermal analyzer, with which a sample can be observed even under a state in which a heat sink is cooled to a room temperature or lower. The thermal analyzer includes: the heat sink, in which a measurement sample container and a reference sample container are placed; a heat sink cover configured to cover the heat sink; a heat sink window provided in the heat sink; a heat sink cover window provided in the heat sink cover; an imaging device configured to image the sample in the heat sink through the heat sink window and the heat sink cover window; a purge gas introduction portion, through which a purge gas is introduced into the heat sink; and a discharge port, through which the purge gas is allowed to flow from one of the heat sink window and the heat sink to a space inside the heat sink cover.
    Type: Grant
    Filed: December 22, 2020
    Date of Patent: October 4, 2022
    Assignee: HITACHI HIGH-TECH SCIENCE CORPORATION
    Inventors: Kengo Kobayashi, Shinya Nishimura, Hirohito Fujiwara
  • Patent number: 11378094
    Abstract: A centrifugal compressor includes: an impeller; a main flow passage which receives the impeller and extends in a rotation axis direction of the impeller; an auxiliary flow passage which includes an upstream communication portion communicating to the main flow passage and a downstream communication portion communicating to the main flow passage at closer to the impeller than the upstream communication portion, and extends in a rotation direction of the impeller; a plurality of opening/closing portions which each have an opening portion and are arranged in the auxiliary flow passage; and a drive unit configured to move at least one of the plurality of opening/closing portions in the rotation direction.
    Type: Grant
    Filed: December 5, 2019
    Date of Patent: July 5, 2022
    Assignee: IHI Corporation
    Inventors: Takashi Fujiwara, Ryusuke Numakura, Kengo Matsuo, Kensuke Hirata, Yuji Sasaki
  • Publication number: 20220185121
    Abstract: A control method for an electric vehicle according to the present embodiment is a control method for an electric vehicle in which an electric motor 4 is used as a traveling drive source and deceleration is performed by a regenerative braking force of the electric motor 4.
    Type: Application
    Filed: March 27, 2019
    Publication date: June 16, 2022
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Akira SAWADA, Takashi NAKAJIMA, Kengo FUJIWARA, Shou OONO, YUI ITO
  • Patent number: 11146196
    Abstract: An electric machine control method includes: calculating a voltage command value based on a torque command value to an electric machine; calculating a modulation rate based on a power-supply voltage and the voltage command value; calculating a compensation gain in accordance with the modulation rate, the compensation gain being used to linearize a relationship between a magnitude of the voltage command value and a magnitude of a fundamental wave component of an output voltage to the electric machine; calculating a compensated voltage command value based on the voltage command value and the compensation gain; controlling the output voltage to the electric machine based on the compensated voltage command value; and limiting the compensation gain to be equal to or less than a predetermined upper limit.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: October 12, 2021
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Takahiro Mizuguchi, Mitsuhiro Shouji, Kengo Fujiwara
  • Patent number: 10994619
    Abstract: A control method for an electric vehicle includes controlling a torque of a motor based on a final torque command value by calculating the final torque command value such that a vibration damping control to reduce vibrations of a driving force transmission system of a vehicle is performed on a target torque command value set based on vehicle information, calculating the final torque command value based on the target torque command value and a value obtained by multiplying a drive-shaft torsional angular velocity by a feedback gain, estimating, by use of a vehicle model that models the driving force transmission system, a dead-zone period during which a motor torque output from the motor is not transmitted to a drive-shaft torque of the vehicle, and determining whether or not the vehicle is just before stop of the vehicle.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: May 4, 2021
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Akira Sawada, Kengo Fujiwara, Shou Oono
  • Patent number: 10972020
    Abstract: The control method for an electric vehicle sets a motor torque command value based on vehicle information and controls torque of a first motor connected to a first drive wheel which is one of a front drive wheel and a rear drive wheel. The control method for an electric vehicle calculates a first torque command value by a feedforward computation based on the motor torque command value, detects a rotation angular velocity of the first motor, and estimates a rotation angular velocity of the first motor based on the first torque command value by using a vehicle model Gp(s) that simulates a transfer characteristic from a torque input to the first drive wheel to a rotation angular velocity of the first motor.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: April 6, 2021
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Akira Sawada, Ken Itou, Kengo Fujiwara
  • Publication number: 20210028733
    Abstract: An electric machine control method includes: calculating a voltage command value based on a torque command value to an electric machine; calculating a modulation rate based on a power-supply voltage and the voltage command value; calculating a compensation gain in accordance with the modulation rate, the compensation gain being used to linearize a relationship between a magnitude of the voltage command value and a magnitude of a fundamental wave component of an output voltage to the electric machine; calculating a compensated voltage command value based on the voltage command value and the compensation gain; controlling the output voltage to the electric machine based on the compensated voltage command value; and limiting the compensation gain to be equal to or less than a predetermined upper limit.
    Type: Application
    Filed: March 16, 2018
    Publication date: January 28, 2021
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Takahiro Mizuguchi, Mitsuhiro Shouji, Kengo Fujiwara
  • Publication number: 20200259431
    Abstract: The control method for an electric vehicle sets a motor torque command value based on vehicle information and controls torque of a first motor connected to a first drive wheel which is one of a front drive wheel and a rear drive wheel. The control method for an electric vehicle calculates a first torque command value by a feedforward computation based on the motor torque command value, detects a rotation angular velocity of the first motor, and estimates a rotation angular velocity of the first motor based on the first torque command value by using a vehicle model Gp(s) that simulates a transfer characteristic from a torque input to the first drive wheel to a rotation angular velocity of the first motor.
    Type: Application
    Filed: June 1, 2017
    Publication date: August 13, 2020
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Akira Sawada, Ken Itou, Kengo Fujiwara
  • Patent number: 10696177
    Abstract: A vehicle control device for decelerating by the regenerative braking of a motor connected to a drive shaft of a drive wheel calculates a torque command value for suppressing a vibration component of the drive shaft by feeding back a torsional angular velocity of the drive shaft to a desired torque that determines the power of the motor and controls the operation of the motor on the basis of the torque command value. The control device estimates a dead zone section, in which the torque of the motor in the vehicle is not transmitted to the drive shaft, on the basis of the desired torque and limits the torque command value in the case where the vehicle is in the dead zone section.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: June 30, 2020
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Kengo Fujiwara, Akira Sawada, Sho Ohno
  • Patent number: 10507819
    Abstract: The control method for the hybrid vehicle includes a rotation speed control torque calculation step of, based on a rotation speed command value for the electric generator and a rotation speed detection value of the electric generator, calculating a torque command value for controlling the rotation speed of the electric generator, and an electric generator control step of controlling the electric generator according to the torque command value.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: December 17, 2019
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Kengo Fujiwara, Ken Itou
  • Publication number: 20190337398
    Abstract: A vehicle control device for decelerating by the regenerative braking of a motor connected to a drive shaft of a drive wheel calculates a torque command value for suppressing a vibration component of the drive shaft by feeding back a torsional angular velocity of the drive shaft to a desired torque that determines the power of the motor and controls the operation of the motor on the basis of the torque command value. The control device estimates a dead zone section, in which the torque of the motor in the vehicle is not transmitted to the drive shaft, on the basis of the desired torque and limits the torque command value in the case where the vehicle is in the dead zone section.
    Type: Application
    Filed: July 29, 2016
    Publication date: November 7, 2019
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Kengo FUJIWARA, Akira SAWADA, Sho OHNO
  • Publication number: 20190299967
    Abstract: The control method for the hybrid vehicle includes a rotation speed control torque calculation step of, based on a rotation speed command value for the electric generator and a rotation speed detection value of the electric generator, calculating a torque command value for controlling the rotation speed of the electric generator, and an electric generator control step of controlling the electric generator according to the torque command value.
    Type: Application
    Filed: June 8, 2016
    Publication date: October 3, 2019
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Kengo FUJIWARA, Ken ITOU
  • Publication number: 20190100114
    Abstract: A control method for an electric vehicle includes controlling a torque of a motor based on a final torque command value by calculating the final torque command value such that a vibration damping control to reduce vibrations of a driving force transmission system of a vehicle is performed on a target torque command value set based on vehicle information, calculating the final torque command value based on the target torque command value and a value obtained by multiplying a drive-shaft torsional angular velocity by a feedback gain, estimating, by use of a vehicle model that models the driving force transmission system, a dead-zone period during which a motor torque output from the motor is not transmitted to a drive-shaft torque of the vehicle, and determining whether or not the vehicle is just before stop of the vehicle.
    Type: Application
    Filed: December 14, 2016
    Publication date: April 4, 2019
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Akira Sawada, Kengo Fujiwara, Shou Oono
  • Patent number: 9252689
    Abstract: A motor control device includes a switching element that controls a motor, a current control part that outputs a PWM signal for driving the switching element, and a setting part that sets a carrier frequency of the PWM signal. Further, a motor control part includes a torque ripple compensation part that sets a torque ripple compensation value based on a motor torque command value, the carrier frequency, and a rotation state of the motor. The current control part outputs the PWM signal based on the motor torque command value and the torque ripple compensation value.
    Type: Grant
    Filed: August 12, 2013
    Date of Patent: February 2, 2016
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Yosuke Fukunaga, Hiromichi Kawamura, Kengo Fujiwara, Hideo Nakamura
  • Patent number: 9209722
    Abstract: An inverter control device includes an inverter; a command value calculator; a phase compensator; an inverter controller; a d-q axes non-interference voltage command value calculator for calculating a d-q axes non-interference voltage command value to cancel out interference voltages and for outputting the d-q axes non-interference voltage command value to the command value calculator; and a reverse phase. The phase compensator calculates the amount of phase lead based on the rotation speed and a phase compensation time set in order to obtain a predetermined phase margin, and compensates for a phase based on characteristics inherent in the motor, by the amount of phase lead. The reverse phase compensator compensates for a phase of the d-q axes non-interference voltage command value by the same amount of compensation as the amount of phase lead in the opposite direction to the phase compensated for by the phase compensator.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: December 8, 2015
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Naoki Takahashi, Mitsuhiro Shouji, Kengo Fujiwara, Yosuke Fukunaga
  • Patent number: 9174524
    Abstract: A vehicle comprises a drive motor (15) that generates a drive torque to be transmitted to drive wheels (18), a power supply source (12, 17) that includes, at least, a generator (12), and supplies power to the drive motor (15), and a programmable controller (20).
    Type: Grant
    Filed: April 9, 2010
    Date of Patent: November 3, 2015
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Yuji Katsumata, Kengo Fujiwara
  • Publication number: 20150229250
    Abstract: A motor control device includes a switching element that controls a motor, a current control part that outputs a PWM signal for driving the switching element, and a setting part that sets a carrier frequency of the PWM signal. Further, a motor control part includes a torque ripple compensation part that sets a torque ripple compensation value based on a motor torque command value, the carrier frequency, and a rotation state of the motor. The current control part outputs the PWM signal based on the motor torque command value and the torque ripple compensation value.
    Type: Application
    Filed: August 12, 2013
    Publication date: August 13, 2015
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Yosuke Fukunaga, Hiromichi Kawamura, Kengo Fujiwara, Hideo Nakamura
  • Publication number: 20150214867
    Abstract: An inverter control device includes an inverter; a command value calculator; a phase compensator; an inverter controller; a d-q axes non-interference voltage command value calculator for calculating a d-q axes non-interference voltage command value to cancel out interference voltages and for outputting the d-q axes non-interference voltage command value to the command value calculator; and a reverse phase. The phase compensator calculates the amount of phase lead based on the rotation speed and a phase compensation time set in order to obtain a predetermined phase margin, and compensates for a phase based on characteristics inherent in the motor, by the amount of phase lead. The reverse phase compensator compensates for a phase of the d-q axes non-interference voltage command value by the same amount of compensation as the amount of phase lead in the opposite direction to the phase compensated for by the phase compensator.
    Type: Application
    Filed: September 20, 2013
    Publication date: July 30, 2015
    Inventors: Naoki Takahashi, Mitsuhiro Shouji, Kengo Fujiwara, Yosuke Fukunaga
  • Patent number: 9041331
    Abstract: A motor controlling apparatus includes a first target torque value calculator, a frequency detector, a second target torque value calculator, a torque command value calculator, a torque limiter, and a controller. The first target torque value calculator calculates a first target torque value, which is a target value of an output torque of a motor. The frequency detector detects a motor rotational frequency. The second target torque value calculator calculates a second target torque value based on the rotational frequency. The torque command value calculator mathematically combines (e.g., adds) the first and target torque values to calculate a torque command value. The torque limiter sets the signs of the first target torque value and the torque command value to be equal to limit the torque command value according to the first target torque value. The controller controls the motor based on the limited torque command value.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: May 26, 2015
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Kengo Fujiwara, Ken Ito
  • Publication number: 20130141028
    Abstract: A motor controlling apparatus includes a first target torque value calculator, a frequency detector, a second target torque value calculator, a torque command value calculator, a torque limiter, and a controller. The first target torque value calculator calculates a first target torque value, which is a target value of an output torque of a motor. The frequency detector detects a motor rotational frequency. The second target torque value calculator calculates a second target torque value based on the rotational frequency. The torque command value calculator mathematically combines (e.g., adds) the first and target torque values to calculate a torque command value. The torque limiter sets the signs of the first target torque value and the torque command value to be equal to limit the torque command value according to the first target torque value. The controller controls the motor based on the limited torque command value.
    Type: Application
    Filed: September 12, 2011
    Publication date: June 6, 2013
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Kengo Fujiwara, Ken Ito