Patents by Inventor Keiichi Enoki

Keiichi Enoki 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: 20200321903
    Abstract: Provided is a control device for an AC rotating electric machine, which includes: a temperature detection unit configured to detect a temperature of a protection unit provided in an object to be protected when a current is supplied from a power conversion circuit including a switching element to the AC rotating electric machine and output, as a detected temperature, one of the temperature and a temperature of the object to be protected that is estimated from the temperature; a temperature compensation unit configured to calculate, through use of the detected temperature output from the temperature detection unit, a compensated temperature equal to or higher than the detected temperature; and a torque limiting unit configured to limit, through use of the compensated temperature calculated by the temperature compensation unit, a torque command value input thereto.
    Type: Application
    Filed: February 19, 2020
    Publication date: October 8, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shingo HARADA, Keiichi ENOKI, Tomohisa SHODA, Nozomu KAMIOKA, Ryosuke SHIGEMATSU, Kazuhiko OTSUKA
  • Publication number: 20200244201
    Abstract: To provide a controller for an AC rotary machine capable of performing on/off control of the switching device of the set which does not fail, by considering the state of the AC rotary machine related to the windings of the failed set. A controller for an AC rotary machine, about a set in which the switching device failed, stops dq-axis current control, and turns on, in the case of the short circuit failure, and turns off, in the case of the open circuit failure, at least the respective phase switching devices of the positive electrode side or the negative electrode side which is the same side as the failed switching device; and about a set which does not fail, continues dq-axis current control and changes the current component of the d-axis according to the state of the AC rotary machine related to the windings of the failed set.
    Type: Application
    Filed: December 7, 2015
    Publication date: July 30, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshimasa NISHIJIMA, Keiichi ENOKI, Masutaka WATANABE, Yasukazu MURATA, Shingo HARADA
  • Publication number: 20200144948
    Abstract: In order to reduce deviation of correction amount when calculating a magnetic pole position correction amount of a permanent magnet type rotating electrical machine, and perform magnetic pole position correction with high accuracy, in state where the permanent magnet type rotating electrical machine is rotated, a d-axis current command value and a q-axis current command value in dg vector control are kept substantially zero, an actual d-axis voltage and an actual q-axis voltage are calculated from a midpoint potential detected from a midpoint potential detection unit, a magnetic pole position correction amount is calculated based on a predetermined arithmetic expression from the actual d-axis voltage and the actual q-axis voltage, and magnetic pole position origin correction is performed based on the magnetic pole position correction amount.
    Type: Application
    Filed: June 6, 2017
    Publication date: May 7, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshimasa NISHIJIMA, Keiichi ENOKI, Masutaka WATANABE, Yasukazu MURATA, Shingo HARADA, Kazuhiko OTSUKA
  • Patent number: 10608569
    Abstract: A control device of an AC rotating electrical machine includes: a midpoint potential detection unit 12 that detects, for respective phases, midpoint potentials 43, 44, 45 of upper switching elements 41 and lower switching elements 42 of an inverter circuit 20; a phase current detection unit 23 that detects a phase current of each phase of an AC rotating electrical machine 3; and a CPU 11 that calculates a current estimated value Idc of DC current that is input from a DC power supply 2 to the inverter circuit 20, on the basis of the detected midpoint potential of each phase and the phase current of each phase.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: March 31, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Daisuke Matsumuro, Keiichi Enoki, Yoshimasa Nishijima, Masutaka Watanabe, Shingo Harada, Yasukazu Murata
  • Publication number: 20200067443
    Abstract: When the connection between a DC power source and a multigroup-multiphase electric-power conversion apparatus is cut off, a control apparatus controls switching devices so that the respective states of the two or more groups of electric-power conversion apparatuses included in the multigroup-multiphase electric-power conversion apparatus are each switched stepwise from a phase short-circuiting state to an all-phase cutoff state at different timings.
    Type: Application
    Filed: May 17, 2017
    Publication date: February 27, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masutaka WATANABE, Keiichi ENOKI, Yoshimasa NISHIJIMA, Shingo HARADA
  • Patent number: 10469015
    Abstract: A motor control device having a motor temperature sensor for detecting a magnet temperature of the motor, a magnet magnetic flux calculation section that calculates a magnet magnetic flux of the motor corresponding to the magnet temperature of the motor, a current combination candidate calculating section that calculates a d-q axis current combination candidate that minimizes the input current of the inverter within a voltage limit ellipse determined by a value that can be output by a voltage of a power supply of the motor, and a d-q axis current search section that searches the d-q axis current that minimizes the input current of the inverter within the range of the combination candidate of the d-q axis currents when the d-q axis current of the motor moves on a voltage limiting ellipse by automatic weakening flux control.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: November 5, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shingo Harada, Keiichi Enoki, Yasukazu Murata, Masutaka Watanabe, Yoshimasa Nishijima
  • Patent number: 10404200
    Abstract: An AC-rotating-electric-machine control apparatus includes two or more electric-power conversion circuits that control respective voltages to be applied to the two or more groups of multi-phase armature windings, for each of the two or more groups of multi-phase armature windings; each of the two or more electric-power conversion circuits has two or more switching devices for opening or closing the corresponding group of multi-phase armature windings, for each of the phases; the two or more switching devices are switching-controlled in such a way that opening operation or duty control can be applied to the corresponding group of multi-phase armature windings.
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: September 3, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masutaka Watanabe, Keiichi Enoki, Yasukazu Murata, Yoshimasa Nishijima, Shingo Harada
  • Publication number: 20180278191
    Abstract: A control device of an AC rotating electrical machine includes: a midpoint potential detection unit 12 that detects, for respective phases, midpoint potentials 43, 44, 45 of upper switching elements 41 and lower switching elements 42 of an inverter circuit 20; a phase current detection unit 23 that detects a phase current of each phase of an AC rotating electrical machine 3; and a CPU 11 that calculates a current estimated value Idc of DC current that is input from a DC power supply 2 to the inverter circuit 20, on the basis of the detected midpoint potential of each phase and the phase current of each phase.
    Type: Application
    Filed: August 29, 2017
    Publication date: September 27, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Daisuke MATSUMURO, Keiichi ENOKI, Yoshimasa NISHIJIMA, Masutaka WATANABE, Shingo HARADA, Yasukazu MURATA
  • Patent number: 10053097
    Abstract: An object of this invention is to obtain a vehicle control apparatus with which departure over a bump can be identified accurately, and when departure over the bump is identified, a required driving force can be controlled to an appropriate value. A departure over bump identification unit identifies departure over a bump, in which an electric vehicle travels over the bump in order to depart, when a motor rotation speed is equal to or lower than a predetermined first rotation speed and an accelerator pedal depression amount remains at or above a predetermined accelerator pedal depression amount continuously for a predetermined first period, and a drive control unit sets a required driving force of a motor at zero, regardless of the accelerator pedal depression amount, and then increases the required driving force at a constant speed, when departure over the bump is identified.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: August 21, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Nobuhide Mori, Keiichi Enoki
  • Patent number: 10050569
    Abstract: An inverter control device that controls a multiple of inverters configured to use the same positive and negative direct current voltage bus lines connected to a power supply and driving a corresponding multiple of motors, the inverter control device including smoothing control means that controls an inverter outflow current so that voltage of the power supply is smoothed by a smoothing capacitor connected to the positive and negative direct current voltage bus lines, and two-phase modulation operation means that fixes a predetermined one phase of a three-phase modulated wave at either a maximum voltage or minimum voltage the inverter can output determined by a voltage between the positive and negative direct current voltage bus lines, and calculates a modulated wave that causes the other two phases to switch.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: August 14, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shingo Harada, Keiichi Enoki, Yasukazu Murata, Masutaka Watanabe, Yoshimasa Nishijima
  • Patent number: 10027265
    Abstract: An inverter control device and inverter control method are such that, when there is a possibility of induction voltage caused by a multi-phase motor exceeding a breakdown voltage of a switching element of an inverter, two of three phases are first interrupted at an appropriate timing in order to restrict induction voltage when shifting from a three-phase short circuit to an all-phase interruption, after which a shift is made to an all-phase interruption at a timing at which currents of the three phases reach the vicinity of zero, whereby a leap in a direct current bus voltage is restricted.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: July 17, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shingo Harada, Keiichi Enoki, Masutaka Watanabe, Yoshimasa Nishijima, Yasukazu Murata, Michitaka Fujiwara
  • Publication number: 20180154887
    Abstract: A temperature detection condition of a temperature detection unit used in a motor system is determined by: obtaining a phase current value flowing through a motor device and obtaining a temperature detection value; calculating, as an integrated phase current value, at least one of a first integrated phase current value, which is obtained by integrating an amount by which the phase current value exceeds a first phase current threshold, and a second integrated phase current value, which is obtained by integrating an amount by which the phase current value is smaller than a second phase current threshold that is equal to or smaller than the first phase current threshold; and determining an amount of variation in the temperature detection value detected by the temperature detection unit following the start of determination of the temperature detection condition and an amount of variation in the calculated integrated phase current value.
    Type: Application
    Filed: November 13, 2017
    Publication date: June 7, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasukazu MURATA, Keiichi ENOKI, Masutaka WATANABE, Yoshimasa NISHIJIMA, Shingo HARADA
  • Publication number: 20180138844
    Abstract: An inverter control device and inverter control method are such that, when there is a possibility of induction voltage caused by a multi-phase motor exceeding a breakdown voltage of a switching element of an inverter, two of three phases are first interrupted at an appropriate timing in order to restrict induction voltage when shifting from a three-phase short circuit to an all-phase interruption, after which a shift is made to an all-phase interruption at a timing at which currents of the three phases reach the vicinity of zero, whereby a leap in a direct current bus voltage is restricted.
    Type: Application
    Filed: June 29, 2017
    Publication date: May 17, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shingo HARADA, Keiichi ENOKI, Masutaka WATANABE, Yoshimasa NISHIJIMA, Yasukazu MURATA, Michitaka FUJIWARA
  • Publication number: 20180123493
    Abstract: A motor control device having a motor temperature sensor for detecting a magnet temperature of the motor, a magnet magnetic flux calculation section that calculates a magnet magnetic flux of the motor corresponding to the magnet temperature of the motor, a current combination candidate calculating section that calculates a d-q axis current combination candidate that minimizes the input current of the inverter within a voltage limit ellipse determined by a value that can be output by a voltage of a power supply of the motor, and a d-q axis current search section that searches the d-q axis current that minimizes the input current of the inverter within the range of the combination candidate of the d-q axis currents when the d-q axis current of the motor moves on a voltage limiting ellipse by automatic weakening flux control.
    Type: Application
    Filed: June 22, 2015
    Publication date: May 3, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shingo HARADA, Keiichi ENOKI, Yasukazu MURATA, Masutaka WATANABE, Yoshimasa NISHIJIMA
  • Publication number: 20180006593
    Abstract: An AC-rotating-electric-machine control apparatus includes two or more electric-power conversion circuits that control respective voltages to be applied to the two or more groups of multi-phase armature windings, for each of the two or more groups of multi-phase armature windings; each of the two or more electric-power conversion circuits has two or more switching devices for opening or closing the corresponding group of multi-phase armature windings, for each of the phases; the two or more switching devices are switching-controlled in such a way that opening operation or duty control can be applied to the corresponding group of multi-phase armature windings.
    Type: Application
    Filed: May 11, 2015
    Publication date: January 4, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masutaka WATANABE, Keiichi ENOKI, Yasukazu MURATA, Yoshimasa NISHIJIMA, Shingo HARADA
  • Patent number: 9859836
    Abstract: By providing a configuration for calculating motor control constants to be set in a motor control apparatus automatically on the basis of a target response time constant obtained from a target response time constant input unit, waveform parameters obtained from a waveform parameter input unit, a normalized time constant obtained from a normalized time constant calculation unit, and a motor load inertia obtained from a motor load inertia input unit, it is possible to obtain a motor control constant calculation device that can determine appropriate motor control constants for obtaining a desired response characteristic by automatic calculation while avoiding variation and an increase in the number of steps due to differences in the abilities of users.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: January 2, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuto Yokoyama, Masahiro Iezawa, Keiichi Enoki, Yasufumi Ogawa, Kotaro Nakano
  • Patent number: 9845089
    Abstract: The control device for a hybrid vehicle includes: a mechanical power source; an electric motor to be used when the mechanical power source is started; a first clutch arranged between the mechanical power source and a first transmission mechanism including a plurality of gear shift stages; a second clutch arranged between the mechanical power source and a second transmission mechanism including a plurality of gear shift stages; an electrical power source coupled to an input shaft of the first transmission mechanism; and a control unit for controlling a torque of at least one of the second clutch or the electric motor so as to compensate a braking force decreased upon a gear shift in the electrical power source when a gear shift request for shifting the gear shift stage of the first transmission mechanism is made during a regeneration travel of the electrical power source.
    Type: Grant
    Filed: April 23, 2013
    Date of Patent: December 19, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kotaro Nakano, Keiichi Enoki, Nobuhide Mori, Hiroyuki Kobayashi, Yasufumi Ogawa
  • Publication number: 20170279383
    Abstract: An inverter control device that controls a multiple of inverters configured to use the same positive and negative direct current voltage bus lines connected to a power supply and driving a corresponding multiple of motors, the inverter control device including smoothing control means that controls an inverter outflow current so that voltage of the power supply is smoothed by a smoothing capacitor connected to the positive and negative direct current voltage bus lines, and two-phase modulation operation means that fixes a predetermined one phase of a three-phase modulated wave at either a maximum voltage or minimum voltage the inverter can output determined by a voltage between the positive and negative direct current voltage bus lines, and calculates a modulated wave that causes the other two phases to switch.
    Type: Application
    Filed: February 14, 2017
    Publication date: September 28, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shingo HARADA, Keiichi ENOKI, Yasukazu MURATA, Masutaka WATANABE, Yoshimasa NISHIJIMA
  • Publication number: 20170264229
    Abstract: MCU (2001) determines whether at least one of double three-phase inverter (2030) or battery (2002) has a failure, or battery (2002) is fully charged, and switches control to be performed in inverter (2030) between all-phase shut off and three-phase short circuit based on a motor rotation speed of double three-phase motor (2050) when MCU (2001) determines that any one of inverter (2030) and battery (2002) has a failure, or battery (2002) is fully charged. Battery (2002) and inverter (2030) can be protected when current is inhibited from flowing from motor (2050) to battery (2002) due to a failure of inverter (2030) or battery (2002).
    Type: Application
    Filed: August 29, 2016
    Publication date: September 14, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasukazu MURATA, Keiichi ENOKI, Masutaka WATANABE, Shingo HARADA, Yoshimasa NISHIJIMA
  • Patent number: 9692351
    Abstract: This invention provides a protective device for a vehicle inverter, with which an inverter element can be protected from overheating while preventing a reduction in drivability. The protective device for a vehicle inverter includes a maximum element temperature calculation unit that calculates a maximum element temperature among respective element temperatures of the inverter, and an element temperature output limit coefficient calculation unit that calculates an output limit value corresponding to the maximum element temperature, sets a current output limit value as a current output limit coefficient when the current output limit value is smaller than a preceding output limit coefficient, and sets, as the current output limit coefficient, a value obtained by adding a predetermined value determined in advance to the preceding output limit coefficient when the current output limit value equals or exceeds the preceding output limit coefficient.
    Type: Grant
    Filed: November 7, 2013
    Date of Patent: June 27, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventor: Keiichi Enoki