Patents by Inventor Toshifumi Nakamura

Toshifumi Nakamura 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: 11105311
    Abstract: An ignition device for an internal combustion engine includes an ignition coil, a first switch, a secondary current adjuster, and controller The ignition coil includes a primary coil, a core, and a secondary coil. The first switch switches an energized state of the primary coil between an ON state and an OFF state. The secondary current adjuster adjusts a current value of a secondary current flowing through the secondary coil. The controller controls the secondary current adjuster so that a current value of the secondary current in at least a part of a charging period of the ignition plug, which is a period from when the energized state of the primary coil is switched from the ON state to the OFF state by the first switch to when dielectric breakdown occurs in the ignition plug, becomes smaller than a peak value of the secondary current after the dielectric breakdown occurs.
    Type: Grant
    Filed: September 29, 2020
    Date of Patent: August 31, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshifumi Nakamura, Takahiko Inada
  • Publication number: 20210222665
    Abstract: An ignition device for an internal combustion engine includes an ignition coil, a first switch, a secondary current adjuster, and controller. The ignition coil includes a primary coil, a core, and a secondary coil. The first switch switches an energized state of the primary coil between an ON state and an OFF state. The secondary current adjuster adjusts a current value of a secondary current flowing through the secondary coil. The controller controls the secondary current adjuster so that a current value of the secondary current in at least a part of a charging period of the ignition plug, which is a period from when the energized state of the primary coil is switched from the ON state to the OFF state by the first switch to when dielectric breakdown occurs in the ignition plug, becomes smaller than a peak value of the secondary current after the dielectric breakdown occurs.
    Type: Application
    Filed: September 29, 2020
    Publication date: July 22, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Toshifumi NAKAMURA, Takahiko INADA
  • Patent number: 10934991
    Abstract: The invention provides an internal combustion engine combustion state detecting device such that ascertaining a combustion state using ionic current detection is carried out accurately over a wide operating range of an internal combustion engine. The internal combustion engine combustion state detecting device includes a spark plug that has a central electrode and a grounding electrode opposing across a gap, and a discharge stopping-induced current detecting device that estimates an induced current caused by a stopping of a spark discharge generated in the gap between the central electrode and the grounding electrode, wherein an ionic current detection threshold is set to a threshold value that is not affected by the induced current using the induced current estimated by the discharge stopping-induced current detecting device.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: March 2, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshifumi Nakamura, Takahiko Inada
  • Patent number: 10859059
    Abstract: Even when detecting the primary voltage of the primary coil side, without detecting the secondary voltage of the secondary coil side of high voltage, it is desired to provide a discharge state detecting apparatus of an internal combustion engine which can detect a spark discharge state with good accuracy, by reducing influences of the discharge current and the resistance component of the discharge path of the secondary coil side, which are generated in the primary voltage. A discharge state detecting apparatus of an internal combustion engine performs correction which reduces a signal component generated by the secondary current in the ignition coil from the primary voltage detected by the primary voltage detector, based on the detected secondary current, and outputs a primary voltage after correction; and determines a spark discharge state based on the primary voltage after correction.
    Type: Grant
    Filed: January 27, 2020
    Date of Patent: December 8, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventor: Toshifumi Nakamura
  • Patent number: 10808673
    Abstract: To provide a control device, of an internal combustion engine, that accurately identifies the combustion state through ion current detection in a wide operation range of the internal combustion engine, without impairing the reliability and the durability of the control device of the internal combustion engine. This internal combustion engine control device includes: an ignition plug having a center electrode and a ground electrode opposed to each other with a gap therebetween; a circulation device for short-circuiting a primary winding to cause a circulation route to enter a conduction state, thereby stopping spark discharge; and an ion-current-detection bias voltage control device for controlling bias voltage for ion current detection. The potential of the center electrode in an ion current detection period is controlled by adjusting the value of the bias voltage and the changing speed of the bias voltage.
    Type: Grant
    Filed: January 2, 2019
    Date of Patent: October 20, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshifumi Nakamura, Takahiko Inada
  • Publication number: 20200318599
    Abstract: Even when detecting the primary voltage of the primary coil side, without detecting the secondary voltage of the secondary coil side of high voltage, it is desired to provide a discharge state detecting apparatus of an internal combustion engine which can detect a spark discharge state with good accuracy, by reducing influences of the discharge current and the resistance component of the discharge path of the secondary coil side, which are generated in the primary voltage. A discharge state detecting apparatus of an internal combustion engine performs correction which reduces a signal component generated by the secondary current in the ignition coil from the primary voltage detected by the primary voltage detector, based on the detected secondary current, and outputs a primary voltage after correction; and determines a spark discharge state based on the primary voltage after correction.
    Type: Application
    Filed: January 27, 2020
    Publication date: October 8, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventor: Toshifumi NAKAMURA
  • Patent number: 10499331
    Abstract: Because it is not possible to sufficiently reduce the number base stations that start uselessly in spite of being in a low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. A base station starts transmission of a control signal with predetermined power when communication between another base station and a mobile station is started and a first predetermined condition is satisfied.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: December 3, 2019
    Assignee: NEC CORPORATION
    Inventors: Toshifumi Nakamura, Kojiro Hamabe, Masayuki Ariyoshi, Kazushi Muraoka
  • Publication number: 20190331083
    Abstract: To provide a control device, of an internal combustion engine, that accurately identifies the combustion state through ion current detection in a wide operation range of the internal combustion engine, without impairing the reliability and the durability of the control device of the internal combustion engine. This internal combustion engine control device includes: an ignition plug having a center electrode and a ground electrode opposed to each other with a gap therebetween; a circulation device for short-circuiting a primary winding to cause a circulation route to enter a conduction state, thereby stopping spark discharge; and an ion-current-detection bias voltage control device for controlling bias voltage for ion current detection. The potential of the center electrode in an ion current detection period is controlled by adjusting the value of the bias voltage and the changing speed of the bias voltage.
    Type: Application
    Filed: January 2, 2019
    Publication date: October 31, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Toshifumi NAKAMURA, Takahiko INADA
  • Patent number: 10364787
    Abstract: Provided is a discharge stopping device for stopping a spark discharge during discharge, including an ignition plug, an ignition coil, a power source device, a first switch, and a controller which causes a spark discharge to be generated by controlling the switching of the first switch, the discharge stopping device further including a second switch which is disposed in a current circulation path connecting both ends of a primary coil of the ignition coil and switches the current circulation path between connected and disconnected states, wherein the controller includes a re-energization control process unit which switches the first switch to a connected state and re-energizes the primary coil with current during occurrence of the spark discharge, and a circulation control process unit which switches a second switch to a connected state and sets a current circulation path to a connected state during occurrence of the spark discharge.
    Type: Grant
    Filed: May 4, 2017
    Date of Patent: July 30, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventor: Toshifumi Nakamura
  • Publication number: 20190113017
    Abstract: The invention provides an internal combustion engine combustion state detecting device such that ascertaining a combustion state using ionic current detection is carried out accurately over a wide operating range of an internal combustion engine. The internal combustion engine combustion state detecting device includes a spark plug that has a central electrode and a grounding electrode opposing across a gap, and a discharge stopping-induced current detecting device that estimates an induced current caused by a stopping of a spark discharge generated in the gap between the central electrode and the grounding electrode, wherein an ionic current detection threshold is set to a threshold value that is not affected by the induced current using the induced current estimated by the discharge stopping-induced current detecting device.
    Type: Application
    Filed: January 25, 2018
    Publication date: April 18, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Toshifumi NAKAMURA, Takahiko INADA
  • Publication number: 20190037490
    Abstract: Because it is not possible to sufficiently reduce the number base stations that start uselessly in spite of being in a low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. A base station starts transmission of a control signal with predetermined power when communication between another base station and a mobile station is started and a first predetermined condition is satisfied.
    Type: Application
    Filed: September 28, 2018
    Publication date: January 31, 2019
    Applicant: NEC CORPORATION
    Inventors: Toshifumi NAKAMURA, Kojiro HAMABE, Masayuki ARIYOSHI, Kazushi MURAOKA
  • Patent number: 10167841
    Abstract: An internal-combustion-engine combustion state detecting apparatus is configured in such a way as to include a circulation unit that short-circuits a primary winding so as to form a circulation path including the primary winding, while a spark discharge is produced in an ignition plug, and a circulation current control unit that controls a circulation current flowing in the circulation path and in such a way that based on an ion current detected by an ion current detection apparatus, the combustion state of an inflammable fuel-air mixture is detected.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: January 1, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshifumi Nakamura, Takahiko Inada
  • Patent number: 10123267
    Abstract: Because it is not possible to sufficiently reduce the number base stations that start uselessly in spite of being in a low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. A base station starts transmission of a control signal with predetermined power when communication between another base station and a mobile station is started and a first predetermined condition is satisfied.
    Type: Grant
    Filed: May 3, 2017
    Date of Patent: November 6, 2018
    Assignee: NEC CORPORATION
    Inventors: Toshifumi Nakamura, Kojiro Hamabe, Masayuki Ariyoshi, Kazushi Muraoka
  • Publication number: 20180230960
    Abstract: An internal-combustion-engine combustion state detecting apparatus is configured in such a way as to include a circulation unit that short-circuits a primary winding so as to form a circulation path including the primary winding, while a spark discharge is produced in an ignition plug, and a circulation current control unit that controls a circulation current flowing in the circulation path and in such a way that based on an ion current detected by an ion current detection apparatus, the combustion state of an inflammable fuel-air mixture is detected.
    Type: Application
    Filed: May 9, 2017
    Publication date: August 16, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Toshifumi NAKAMURA, Takahiko INADA
  • Patent number: 9998937
    Abstract: A method and a device for estimating a communication load, as well as a radio station and an upper-level apparatus in a radio communication system, are provided that can estimate a communication load in a target network with high accuracy by using received quality information. A communication load estimation function (1) for estimating a communication load in a network (NW) estimates the communication load in the network by using at least a first quality indicator (Q1), which is a quality measurement value including entire received power, and a second quality indicator (Q2), which is a quality measurement value including the signal-to-noise-and-interference ratio of a reference signal.
    Type: Grant
    Filed: May 12, 2014
    Date of Patent: June 12, 2018
    Assignee: NEC Corporation
    Inventors: Hiroto Sugahara, Jun Shikida, Hiroaki Aminaka, Toshifumi Nakamura
  • Publication number: 20180119666
    Abstract: Provided is a discharge stopping device for stopping a spark discharge during discharge, including an ignition plug, an ignition coil, a power source device, a first switch, and a controller which causes a spark discharge to be generated by controlling the switching of the first switch, the discharge stopping device further including a second switch which is disposed in a current circulation path connecting both ends of a primary coil of the ignition coil and switches the current circulation path between connected and disconnected states, wherein the controller includes a re-energization control process unit which switches the first switch to a connected state and re-energizes the primary coil with current during occurrence of the spark discharge, and a circulation control process unit which switches a second switch to a connected state and sets a current circulation path to a connected state during occurrence of the spark discharge.
    Type: Application
    Filed: May 4, 2017
    Publication date: May 3, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventor: Toshifumi NAKAMURA
  • Publication number: 20170303193
    Abstract: Because it is not possible to sufficiently reduce the number base stations that start uselessly in spite of being in a low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. A base station starts transmission of a control signal with predetermined power when communication between another base station and a mobile station is started and a first predetermined condition is satisfied.
    Type: Application
    Filed: May 3, 2017
    Publication date: October 19, 2017
    Applicant: NEC CORPORATION
    Inventors: Toshifumi NAKAMURA, Kojiro HAMABE, Masayuki ARIYOSHI, Kazushi MURAOKA
  • Patent number: 9693301
    Abstract: Because it is not possible to sufficiently reduce the number base stations that start uselessly in spite of being in a low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. A base station starts transmission of a control signal with predetermined power when communication between another base station and a mobile station is started and a first predetermined condition is satisfied.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: June 27, 2017
    Assignee: NEC CORPORATION
    Inventors: Toshifumi Nakamura, Kojiro Hamabe, Masayuki Ariyoshi, Kazushi Muraoka
  • Patent number: 9386537
    Abstract: The present invention is a device which, when a second wireless system shares the use of a frequency which is allocated to a first wireless system, estimates receiving power when a second wireless signal which is transmitted from a transmission station of the second wireless system is received at a receiving station of the first wireless system. The receiving power estimation device comprises a correction means for correcting a receiving power estimate value of the second wireless signal at the first wireless system receiving station which is computed using an estimate value of path loss from the second wireless system transmission station to the first wireless system receiving station, said correction using a receiving power measurement value of the second wireless signal which is measured in a transmission station periphery sensor station which is a sensor station which is located in the periphery of the second wireless system transmission station.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: July 5, 2016
    Assignee: NEC CORPORATION
    Inventors: Kazushi Muraoka, Kojiro Hamabe, Hiroto Sugahara, Toshifumi Nakamura
  • Publication number: 20160165535
    Abstract: Because it is not possible to sufficiently reduce the number base stations that start uselessly in spite of being in a low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. A base station starts transmission of a control signal with predetermined power when communication between another base station and a mobile station is started and a first predetermined condition is satisfied.
    Type: Application
    Filed: February 11, 2016
    Publication date: June 9, 2016
    Applicant: NEC CORPORATION
    Inventors: Toshifumi NAKAMURA, Kojiro HAMABE, Masayuki ARIYOSHI, Kazushi MURAOKA