Patents by Inventor Yohei Moriyama

Yohei Moriyama 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: 20200388610
    Abstract: A semiconductor rectifier includes a transistor and a diode. The transistor includes a source electrode, a drain electrode and a gate electrode. The diode includes an anode electrode and a cathode electrode. The anode electrode is electrically connected to the gate electrode, and the cathode electrode is electrically connected to the source electrode.
    Type: Application
    Filed: November 26, 2018
    Publication date: December 10, 2020
    Inventors: Atsushi YAMAGUCHI, Junichi KASHIWAGI, Yohei MORIYAMA
  • Publication number: 20200331457
    Abstract: A control device for a hybrid vehicle is provided. When a first drive mode is selected as the drive mode of the hybrid vehicle, a control section shifts the drive mode to a second drive mode when a charge amount of a battery for an electric motor becomes smaller than or equal to a determination charge amount. The first drive mode operates the electric motor while an internal combustion engine is stopped. The second drive mode permits the operation of the internal combustion engine. The control section executes a shifting process when the upper limit system output is lower than or equal to a startup determination output even though the charge amount of the battery is greater than the determination charge amount. The shifting process shifts the drive mode to the second drive mode to start the internal combustion engine.
    Type: Application
    Filed: March 11, 2020
    Publication date: October 22, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yohei MORIYAMA, Shigeki NAKAYAMA, Ikuma TSUZUKI
  • Publication number: 20200067407
    Abstract: A ripple injection circuit equipped with: a capacitor that passes a frequency component of an input voltage or a frequency component of an output voltage and that generates a first ripple voltage having a first ripple component; and an integration circuit that integrates a comparison result signal and that generates a second ripple voltage having a second ripple component. The first ripple component and the second ripple component are added to a feedback voltage.
    Type: Application
    Filed: May 10, 2018
    Publication date: February 27, 2020
    Applicant: ROHM CO., LTD.
    Inventors: Junichi KASHIWAGI, Atsushi Yamaguchi, Yohei MORIYAMA, Yuta OKAWAUCHI, Yusuke NAKAKOHARA, Ken Nakahara
  • Patent number: 10428757
    Abstract: A fuel injection control device for an internal combustion engine includes an electronic control unit configured to execute division processing for learning for dividing a requested injection amount into an injection amount of partial lift injection of an in-cylinder injection valve and a port injection amount of injection of a port injection valve, detect, on the basis of at least one of a terminal electric potential of a coil and a current flowing through the coil, an inflection point of a change in induced electromotive force of the coil in time attributable to a decline in a relative speed of a mover with respect to the coil, and correct the energization processing at a time when the partial lift injection is executed based on a timing of the detection of the inflection point.
    Type: Grant
    Filed: January 10, 2018
    Date of Patent: October 1, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yohei Moriyama, Shinji Satoh, Daisuke Kobayashi, Kohji Fujiwara
  • Publication number: 20180209370
    Abstract: A fuel injection control device for an internal combustion engine includes an electronic control unit configured to execute division processing for learning for dividing a requested injection amount into an injection amount of partial lift injection of an in-cylinder injection valve and a port injection amount of injection of a port injection valve, detect, on the basis of at least one of a terminal electric potential of a coil and a current flowing through the coil, an inflection point of a change in induced electromotive force of the coil in time attributable to a decline in a relative speed of a mover with respect to the coil, and correct the energization processing at a time when the partial lift injection is executed based on a timing of the detection of the inflection point.
    Type: Application
    Filed: January 10, 2018
    Publication date: July 26, 2018
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yohei MORIYAMA, Shinji SATOH, Daisuke KOBAYASHI, Kohji FUJIWARA
  • Patent number: 9509216
    Abstract: A switching power supply circuit includes: a voltage generation circuit that generates an output voltage by smoothing, with a capacitor, a voltage produced in an inductor; an integration circuit that integrates a switching voltage to generate a first ripple voltage including a first ripple component; a feedback voltage generation circuit that divides the output voltage to generate a feedback voltage; a comparison circuit that compares the feedback voltage with a reference voltage to output the result of the comparison as a comparison result signal; an integration circuit that integrates the comparison result signal to generate a second ripple voltage including a second ripple component; and a drive circuit that controls the turning on and off of a switch element based on the comparison result signal, where the first ripple component and the second ripple component are added to the feedback voltage.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: November 29, 2016
    Assignee: Rohm Co., Ltd.
    Inventors: Atsushi Yamaguchi, Yohei Moriyama, Koki Sakamoto
  • Patent number: 8281650
    Abstract: When a rotation fluctuation amount of an engine exceeds a predetermined threshold, it is determined that there is a possibility that a misfire has occurred. Then, when a rotation fluctuation pattern of the engine coincides with a first rotation fluctuation pattern, it is determined that a misfire has occurred; whereas, when the rotation fluctuation pattern does not coincide with the first rotation fluctuation pattern, it is determined whether the rotation fluctuation pattern coincides with a specific rotation fluctuation pattern in consideration of a lock-up state of a lock-up clutch or whether an engine rotational speed is lower than a threshold. When the determination is affirmative, occurrence of a misfire is determined on the basis of whether the rotation fluctuation pattern of the engine coincides with a second misfire determination pattern that is defined to be smaller in variation of a rotation fluctuation amount than the first rotation fluctuation pattern.
    Type: Grant
    Filed: July 9, 2009
    Date of Patent: October 9, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kiyotaka Kushihama, Yohei Moriyama
  • Publication number: 20100031736
    Abstract: When a rotation fluctuation amount of an engine exceeds a predetermined threshold, it is determined that there is a possibility that a misfire has occurred. Then, when a rotation fluctuation pattern of the engine coincides with a first rotation fluctuation pattern, it is determined that a misfire has occurred; whereas, when the rotation fluctuation pattern does not coincide with the first rotation fluctuation pattern, it is determined whether the rotation fluctuation pattern coincides with a specific rotation fluctuation pattern in consideration of a lock-up state of a lock-up clutch or whether an engine rotational speed is lower than a threshold. When the determination is affirmative, occurrence of a misfire is determined on the basis of whether the rotation fluctuation pattern of the engine coincides with a second misfire determination pattern that is defined to be smaller in variation of a rotation fluctuation amount than the first rotation fluctuation pattern.
    Type: Application
    Filed: July 9, 2009
    Publication date: February 11, 2010
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kiyotaka Kushihama, Yohei Moriyama