Patents by Inventor Atsuko OKA

Atsuko OKA 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: 10862417
    Abstract: A rotary electric device control device controls driving of a rotary electric device including a plurality of winding sets. The rotary electric device control device includes: a plurality of drive circuits; and a plurality of control units. The control units include signal output units for outputting control signals to the drive circuits corresponding to the control units, respectively, and communicate with each other. The control units include: one master control unit; and at least one slave control unit. An electric power steering device includes: a rotary electric device control device; the rotary electric device that outputs an assist torque for assisting a steering operation of a steering wheel by a driver; and a power transmission unit that transmits a driving force of the rotary electric device to a drive target.
    Type: Grant
    Filed: May 7, 2019
    Date of Patent: December 8, 2020
    Assignee: DENSO CORPORATION
    Inventors: Shuji Kuramitsu, Koichi Nakamura, Atsuko Oka, Masaya Taki, Hideki Kabune, Yuki Watanabe, Toshimitsu Sakai, Yosuke Ogi
  • Publication number: 20200353973
    Abstract: A rotating electric machine control device has an electronic control unit, or an ECU that controls driving of a motor having motor windings, and includes mutually-communicable plural control units. The control unit includes a basic instruction calculation unit, a field-weakening calculation unit, and a current control calculation unit and a PWM (pulse width modulation) output unit. The current control calculation unit and the PWM output unit generate a PWM signal based on d-axis current instruction values and q-axis current instruction values that are calculated based on basic current instruction values and field-weakening d-axis current instruction value. At least a part of the instruction values used for generation of the PWM signal is shared by the plural control units.
    Type: Application
    Filed: May 5, 2020
    Publication date: November 12, 2020
    Inventors: Kouichi NAKAMURA, Nobuyori NAKAZIMA, Atsuko OKA
  • Publication number: 20200321769
    Abstract: In a control device, control circuit units are connected to separate circuit power sources and to separate grounds. Ground monitor circuits respectively have a first resistor with one end connected to a voltage source, a second resistor with one end connected to an input terminal of a corresponding control circuit unit, and a capacitor. Among the one end of the first resistor, an other end of the first resistor, and the other end of the second resistor, at least one is connected to the subject system, and at least one is connected to an other system, and the control circuit unit monitors a ground abnormality of the other system based on a terminal voltage of the input terminal to which the second resistor is connected.
    Type: Application
    Filed: March 31, 2020
    Publication date: October 8, 2020
    Inventors: Kouichi NAKAMURA, Hideki KABUNE, Atsuko OKA
  • Patent number: 10717462
    Abstract: A sensor device includes: multiple sensor units, each of which includes multiple sensor elements and a signal processing unit that generates and transmits an output signal including multiple detection signals corresponding to detection values of the sensor elements; and multiple control units, each of which includes a communication unit that receives the output signal, an abnormality monitoring unit that monitors abnormality of the respective sensor unit, and a physical quantity computation unit that computes a physical quantity based on at least one of the detection signals which is normal. One control unit mutually transmits and receives the detection signals as subject sensor signals received from the respective sensor unit and the detection signals as other sensor signals received from another one of the control units with another system control unit.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: July 21, 2020
    Assignee: DENSO CORPORATION
    Inventors: Atsuko Oka, Shuji Kuramitsu, Koichi Nakamura
  • Publication number: 20200207408
    Abstract: A motor controller for controlling a motor includes first and second angle sensors detecting motor rotation, and first and second detection circuits detecting rotation number information based on sensor output from the angle sensors. Further, the motor controller includes a steer angle information obtainer obtaining steer angle information involving steering of a vehicle from an external sensor, which is different from the angle sensors, and an abnormality determiner determining abnormality of information that has a matching degree of lower than a preset value when post-conversion information, or value measured by the same characteristics. This information is compared with each other after conversion from the rotation number information and from the steer angle information, and is used by a control amount calculator to calculate a control amount of the motor based on the information determined as having no abnormality by the abnormality determiner.
    Type: Application
    Filed: December 12, 2019
    Publication date: July 2, 2020
    Inventors: Koichi NAKAMURA, Nobuyori NAKAJIMA, Go ENDOH, Yosuke OGI, Atsuko OKA, Shuji KURAMITSU, Takashi SUZUKI, Haruo SUZUKI
  • Publication number: 20200180685
    Abstract: A steering system in a vehicle includes a plurality of subsystems provided with a control unit. The control unit includes a storage unit storing steer angle information regarding a steer angle of one of a steering mechanism and a steered mechanism when the steering mechanism or the steered mechanism stops, an abnormality determiner determining abnormality of the motor rotation detection value and the detection circuit in the plurality of subsystems at a start time of a motor based on a comparison of at least two parameters, and a steer angle calculator calculating the steer angle based on the parameters having been determined by the abnormality determiner as not abnormal.
    Type: Application
    Filed: December 4, 2019
    Publication date: June 11, 2020
    Inventors: Takashi SUZUKI, Shuji KURAMITSU, Nobuyori NAKAJIMA, Go ENDOH, Haruo SUZUKI, Koichi NAKAMURA, Yosuke OGI, Atsuko OKA
  • Patent number: 10666179
    Abstract: A control system includes a plurality of control devices each including an initial check unit that performs an initial check before drive control of a rotary electric machine, a transmission/reception unit that transmits/receives an end signal indicating that the initial check is ended, and a drive control unit that performs the drive control of the rotary electric machine after the initial check. The drive control unit starts the drive control of the rotary electric machine when the initial check of the corresponding control device is ended and the end signal is acquired from another control device, and starts the drive control of the rotary electric machine after a lapse of a predetermined time from the start of the initial check of the corresponding control device when the initial check of the corresponding control device is ended and the end signal is not acquired from the another control device.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: May 26, 2020
    Assignee: DENSO CORPORATION
    Inventors: Koichi Nakamura, Shuji Kuramitsu, Atsuko Oka
  • Publication number: 20200114961
    Abstract: A rotation detector has a first controller that monitors abnormality of a rotation number calculated by a rotation number calculator based on the calculated rotation number and a preset rotation angle. The first controller in a first system is configured to output rotation information calculated by a second controller in a second system upon having determination that the rotation number of the first system has abnormality, for a continuation of the rotation information calculation.
    Type: Application
    Filed: October 9, 2019
    Publication date: April 16, 2020
    Inventors: Haruo SUZUKI, Nobuyori NAKAJIMA, Koichi NAKAMURA, Go ENDOH, Atsuko OKA, Takashi SUZUKI, Yosuke OGI, Shuji KURAMITSU
  • Publication number: 20200114967
    Abstract: A rotation detection device includes a plurality of detectors each including a plurality of calculators respectively calculating a detection value. A control unit of the rotation detection device monitors abnormality of detection values respectively detected by the plurality of detectors, and, when determining abnormality, identifies a calculator calculating an abnormal detection value based on a result of comparison between the detection values of the plurality of calculators. Then, the control unit continues calculation of an absolute angle by using the detection values from the calculators other than the identified calculator.
    Type: Application
    Filed: October 9, 2019
    Publication date: April 16, 2020
    Inventors: Nobuyori NAKAJIMA, Haruo SUZUKI, Takashi SUZUKI, Go ENDOH, Koichi NAKAMURA, Yosuke OGI, Atsuko OKA, Shuji KURAMITSU
  • Publication number: 20200047805
    Abstract: A steering angle detection device includes plural control units and plural steering angle sensors. Each control unit is configured to transmit steering angle information related to a steering angle of a vehicle to an external device and transmit and receive information mutually therebetween. Each steering angle sensor is provided in correspondence to each control unit and configured to output a sensor signal corresponding to a detection value of a change in the steering angle to the corresponding control unit. One of the control units transmits, as a transmission control unit, the steering angle information to the external device at one transmission timing.
    Type: Application
    Filed: October 16, 2019
    Publication date: February 13, 2020
    Inventors: Atsuko OKA, Shuji KURAMITSU, Koichi NAKAMURA, Yuki WATANABE, Toshihiro FUJITA, Takaharu KOZAWA, Shuhei MIYACHI, Katsuhiko HAYASHI, Masaya TAKI, Toshimitsu SAKAI
  • Publication number: 20200047806
    Abstract: A steering angle detection device is provided with a plurality of rotation angle sensors and a plurality of control units. The rotation angle sensors are capable of at least continuously calculating a rotation speed while an ignition switch of a vehicle is turned off, and are provided so as to correspond to steering angle calculation units which calculate steering angle based on the rotation speed and a rotation angle acquired from the rotation angle sensors and midpoint information related to the neutral position of a steering member. Power supplies are provided on a per-system basis. The rotation angle sensors or the control units are capable of holding the midpoint information while the ignition switch is turned off. If a power supply abnormality resulting in power supply failure occurs in some of the systems, the control unit of the abnormal system acquires the midpoint information and the rotation speed from the control unit of a normal system when the ignition switch is turned on.
    Type: Application
    Filed: October 16, 2019
    Publication date: February 13, 2020
    Inventors: Takaharu KOZAWA, Shuji KURAMITSU, Koichi NAKAMURA, Yuki WATANABE, Atsuko OKA, Toshihiro FUJITA, Shuhei MIYACHI, Masaya TAKI, Toshimitsu SAKAI, Katsuhiko HAYASHI
  • Patent number: 10538265
    Abstract: A rotary electric device control device for controlling driving of a rotary electric device including a plurality of winding sets, includes: a plurality of drive circuits; and a plurality of control units that include signal output units for outputting control signals to the drive circuits corresponding to the control units, respectively. The one of the control units generates a control signal according to a command value calculated by each system, a host system detection value relating to a detection value of a host system, and another system detection value relating to another detection value of another system. An electric power steering device includes: the rotary electric device control device; the rotary electric device that outputs an assist torque for assisting a steering operation of a steering wheel by a driver; and a power transmission unit that transmits a driving force of the rotary electric device to a drive target.
    Type: Grant
    Filed: May 7, 2019
    Date of Patent: January 21, 2020
    Assignee: DENSO CORPORATION
    Inventors: Shuji Kuramitsu, Koichi Nakamura, Atsuko Oka, Masaya Taki, Hideki Kabune
  • Publication number: 20190359253
    Abstract: A rotary electric machine control device includes multiple drive circuits provided for respective winding sets in a rotary electric machine, and multiple control units. When combinations of the winding sets and configurations provided correspondingly to the respective winding sets are defined as systems, the control units are provided for the respective systems. Each of the control units controls energization of the winding set provided correspondingly, and monitors an abnormality of a monitoring target. Each of the control units performs an abnormality detection time backup control during a period from detection of the abnormality of the monitoring target to confirmation of the abnormality, and performs an abnormality confirmation time backup control when the abnormality is confirmed.
    Type: Application
    Filed: August 7, 2019
    Publication date: November 28, 2019
    Inventors: Shuji KURAMITSU, Hideki KABUNE, Koichi NAKAMURA, Atsuko OKA, Masaya TAKI
  • Patent number: 10486735
    Abstract: In a rotation detecting apparatus, while a switch is in an on state so that electrical power is supplied from a power source to a controller via the switch, the controller receives, as a first output signal, an output signal output from an output unit of a first rotation sensor, and receives, as a second output signal, an output signal output from an output unit of the second rotation sensor. The first output signal includes at least the first rotational information and the second rotational information based on the first rotation sensor, and the second output signal includes at least the first rotational information and the second rotational information based on the second rotation sensor. The controller determines whether there is a malfunction in each of the first and second rotation sensors as a function of the first output signal and the second output signal.
    Type: Grant
    Filed: February 8, 2018
    Date of Patent: November 26, 2019
    Assignee: DENSO CORPORATION
    Inventors: Toshihiro Fujita, Takaharu Kozawa, Shuhei Miyachi, Katsuhiko Hayashi, Shuji Kuramitsu, Koichi Nakamura, Yuki Watanabe, Atsuko Oka, Masaya Taki, Toshimitsu Sakai
  • Patent number: 10475562
    Abstract: A method for maintaining a refrigeration unit includes a connecting step of connecting a refrigerator body to a vacuum case with a first cooling stage in thermal contact with a radiation shield, where in the connecting step, the fastening force of the fastening member is adjusted such that the temperature of the first cooling stage becomes a target temperature.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: November 12, 2019
    Assignee: JAPAN SUPERCONDUCTOR TECHNOLOGY INC.
    Inventors: Hitoshi Miyata, Atsuko Oka
  • Publication number: 20190256129
    Abstract: A rotary electric machine control device for controlling driving of a rotary electric machine including a plurality of winding sets, includes: a plurality of drive circuits; and a plurality of control units, each of which includes: an individual current limit value calculation unit; a current limit value calculation unit; and a control signal calculation unit. The current limit value calculation unit switches between a current limit value sharing mode and a current limit value non-sharing mode. An electric power steering device includes: the rotary electric machine control device; the rotary electric machine that outputs an assist torque for assisting a steering operation of a steering wheel by a driver; and a power transmission unit that transmits a driving force of the rotary electric machine to a drive target.
    Type: Application
    Filed: May 7, 2019
    Publication date: August 22, 2019
    Inventors: Atsuko OKA, Shuji KURAMITSU, Koichi NAKAMURA, Nobuyori NAKAJIMA, Go ENDOH, Yosuke OGI
  • Publication number: 20190256130
    Abstract: A rotary electric device control device for controlling driving of a rotary electric device including a plurality of winding sets, includes: a plurality of drive circuits; and a plurality of control units that include signal output units for outputting control signals to the drive circuits corresponding to the control units, respectively. The one of the control units generates a control signal according to a command value calculated by each system, a host system detection value relating to a detection value of a host system, and another system detection value relating to another detection value of another system. An electric power steering device includes: the rotary electric device control device; the rotary electric device that outputs an assist torque for assisting a steering operation of a steering wheel by a driver; and a power transmission unit that transmits a driving force of the rotary electric device to a drive target.
    Type: Application
    Filed: May 7, 2019
    Publication date: August 22, 2019
    Inventors: Shuji KURAMITSU, Koichi NAKAMURA, Atsuko OKA, Masaya TAKI, Hideki KABUNE
  • Publication number: 20190260324
    Abstract: A rotary electric device control device controls driving of a rotary electric device including a plurality of winding sets. The rotary electric device control device includes: a plurality of drive circuits; and a plurality of control units. The control units include signal output units for outputting control signals to the drive circuits corresponding to the control units, respectively, and communicate with each other. The control units include: one master control unit; and at least one slave control unit. An electric power steering device includes: a rotary electric device control device; the rotary electric device that outputs an assist torque for assisting a steering operation of a steering wheel by a driver; and a power transmission unit that transmits a driving force of the rotary electric device to a drive target.
    Type: Application
    Filed: May 7, 2019
    Publication date: August 22, 2019
    Inventors: Shuji KURAMITSU, Koichi NAKAMURA, Atsuko OKA, Masaya TAKI, Hideki KABUNE, Yuki WATANABE, Toshimitsu SAKAI, Yosuke OGI
  • Publication number: 20190248407
    Abstract: A steering control apparatus controlling an electric power steering apparatus includes a first control part and a second control part. The first control part communicates with an external device and executes a specific process. The second control part communicates with the first control part and executes the specific process. The first control part can acquire first information and second information. When all of the first information and the second information are positive, the first control part transmits positive information to the external device. When a part of the first information and the second information is negative, the first control part transmits negative information to the external device.
    Type: Application
    Filed: February 5, 2019
    Publication date: August 15, 2019
    Inventors: Koichi NAKAMURA, Nobuyori NAKAJIMA, Go ENDOH, Yosuke OGI, Atsuko OKA
  • Publication number: 20190241214
    Abstract: Inverter circuits are provided for motor winding sets, respectively. Control units are provided for the motor winding sets to generate control signals related to driving of the inverter circuits and control currents flowing through the motor winding sets, respectively, thereby controlling driving of a motor. The control mode includes a manual steering mode for controlling the motor according to a steering operation on a steering wheel by a driver and an automatic steering mode for controlling the motor independently of the steering operation on the steering wheel by the driver. The control units are capable of switching the control modes and differentiate the current control according to the control mode. By making the current control different according to the control mode, it is possible to attain optimal characteristics which correspond to each control mode.
    Type: Application
    Filed: January 31, 2019
    Publication date: August 8, 2019
    Inventors: Atsuko OKA, Nobuyori NAKAJIMA, Go ENDOH, Koichi NAKAMURA, Yosuke OGI