Patents by Inventor Shin Kumagai

Shin Kumagai 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: 11511803
    Abstract: The power control unit sets a drive interval for driving the sensor by providing power intermittently to the sensor to a first time interval when no change is detected in the sine-wave signal and the cosine-wave signal, sets to the second time interval that is shorter than the first time interval when a change in only one of the sine-wave signal and the cosine-wave signal is detected, and sets to the third time interval that is shorter than the second time interval when a change in one of the sine-wave signal and the cosine-wave signal is detected and then a change in the other is detected.
    Type: Grant
    Filed: April 7, 2021
    Date of Patent: November 29, 2022
    Assignee: NSK LTD.
    Inventors: Takayuki Kobayashi, Dai Suzuki, Shin Kumagai, Hidetaka Nakamura
  • Patent number: 11453439
    Abstract: The power control unit sets a drive interval for driving the sensor by providing power intermittently to the sensor to a first time interval when no change is detected in the sine-wave signal and the cosine-wave signal, sets to the second time interval that is shorter than the first time interval when a change in only one of the sine-wave signal and the cosine-wave signal is detected, and sets to the third time interval that is shorter than the second time interval when a change in one of the sine-wave signal and the cosine-wave signal is detected and then a change in the other is detected.
    Type: Grant
    Filed: April 7, 2021
    Date of Patent: September 27, 2022
    Assignee: NSK LTD.
    Inventors: Takayuki Kobayashi, Dai Suzuki, Shin Kumagai, Hidetaka Nakamura
  • Publication number: 20220297757
    Abstract: A rotation angle detection device including: an angular position calculation unit configured to calculate angular position information representing an angular position of the motor rotation shaft based on a first sensor signal of the first sensor; an rotation number detection unit configured to detect a rotation number of the motor rotation shaft based on a second sensor signal of a second sensor and outputs rotation number information representing the rotation number; a rotation angle calculation unit configured to calculate rotation angle information indicating a rotation angle of the motor rotation shaft based on the angular position information and the rotation number information; and a power supply unit configured to stop supplying power to the first sensor, the angular position calculation unit and the rotation angle calculation unit and to supply power to the second sensor and the rotation number detection unit when the power switch is off.
    Type: Application
    Filed: April 7, 2021
    Publication date: September 22, 2022
    Applicant: NSK LTD.
    Inventors: Takayuki KOBAYASHI, Dai SUZUKI, Shin KUMAGAI, Hidetaka NAKAMURA
  • Publication number: 20220089216
    Abstract: The power control unit sets a drive interval for driving the sensor by providing power intermittently to the sensor to a first time interval when no change is detected in the sine-wave signal and the cosine-wave signal, sets to the second time interval that is shorter than the first time interval when a change in only one of the sine-wave signal and the cosine-wave signal is detected, and sets to the third time interval that is shorter than the second time interval when a change in one of the sine-wave signal and the cosine-wave signal is detected and then a change in the other is detected.
    Type: Application
    Filed: April 7, 2021
    Publication date: March 24, 2022
    Applicant: NSK LTD.
    Inventors: Takayuki KOBAYASHI, Dai SUZUKI, Shin KUMAGAI, Hidetaka NAKAMURA
  • Publication number: 20220041215
    Abstract: The power management unit supplies first power that is continuous power to the second sensor when the power switch is on, supplies second power that is intermittent power having a voltage lower than the first power to the second sensor when the power switch is off, and outputs rotation number information representing a rotation number of the motor rotation shaft based on the second sensor signal. The power management unit includes a comparator that operates using the second power as the power source when the power switch is off and compare the second sensor signal and the reference voltage, and a counter that detects the rotation number of the motor rotation shaft by counting the output of the comparators.
    Type: Application
    Filed: April 7, 2021
    Publication date: February 10, 2022
    Applicant: NSK LTD.
    Inventors: Dai SUZUKI, Takayuki KOBAYASHI, Shin KUMAGAI, Hidetaka NAKAMURA
  • Patent number: 10604174
    Abstract: A motor control unit that is connected to a motor release switch which includes FETs and is disposed between an inverter and a motor, including: a control section to detect an assist state of the inverter, to turn-ON or turn-OFF a control of the inverter based on a detection result and to detect whether abnormality is existed or not; a motor rotational speed detecting section to detect a motor rotational speed; an energy calculating section to calculate an energy based on the motor rotational speed; a judging section to turn-OFF all of the FETs of the motor release switch when the energy is within an area of safety operation; and a state detecting section to detect whether abnormality is existed or not based on information from an abnormality detecting section that detects abnormality of the sensors and the inverter, wherein the control section turns-ON the control of the inverter when the state detecting section does not detect abnormality and turns-OFF the control of the inverter when the state detecting se
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: March 31, 2020
    Assignee: NSK LTD.
    Inventors: Teruyoshi Kogure, Shigeru Shimakawa, Shin Kumagai, Ryoichi Suzuki
  • Patent number: 10543869
    Abstract: An electronic control unit diagnoses a short failure of an inverter FETs and diagnoses whether the failure of the FET-short detecting section has occurred. The unit controls a motor through an inverter including a bridge having an upper-stage FETs and a lower-stage FETs via an MCU, having: an FET-short detecting section to detect a short failure of the upper-stage FETs and the lower-stage FETs based on respective connection point voltages of the upper-stage FETs and the lower-stage FETs; and a diagnostic function to detect a failure of the FET-short detecting section. The diagnostic function diagnoses the failure of the FET-short detecting section at start up and turns-OFF the upper-stage FETs and the lower-stage FETs when the failure is detected. The FET-short detecting section diagnoses the short failure of the upper-stage FETs and the lower-stage FETs when the failure of the FET-short detecting section is not detected.
    Type: Grant
    Filed: September 24, 2018
    Date of Patent: January 28, 2020
    Assignee: NSK LTD.
    Inventors: Shin Kumagai, Kyosho Uryu, Nobuhiko Ando
  • Patent number: 10486736
    Abstract: [Problem] An object of the present invention is to provide a motor control unit that driving-controls a motor having the dual-system windings, even in a case that one driving control system is an abnormality (including a failure), turns-ON of one common reverse-connection protection-FET by a driving signal of the other normal driving control system, and achieves a miniaturization and a reduction in costs, an electric power steering apparatus that is equipped with the motor control unit, and a vehicle.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: November 26, 2019
    Assignee: NSK LTD.
    Inventors: Kyosho Uryu, Shin Kumagai
  • Patent number: 10471984
    Abstract: An electronic control unit where an external watch dog timer (WDT) can always normally detect an abnormality (a failure) to a micro controller unit (MCU) related to a built-in self-test (BIST) function and which can maintain safety of a system. The control unit includes an external WDT to detect an abnormality of the MCU, a reset circuit to reset the MCU when the external WDT detects the abnormality of the MCU, and an ON/OFF control section to turn a gate of the semiconductor switching device on or off in accordance with the external WDT. The inverter is stopped by turning the gate off via the ON/OFF control section when the external WDT is a disable state. When the abnormality of the MCU is not detected in an enable state, the inverter is driven by turning the gate on via the ON/OFF control section. When the abnormality of the MCU is detected, the inverter is stopped by turning the gate off via the ON/OFF control section and the MCU is reset by the reset circuit.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: November 12, 2019
    Assignees: NSK LTD., TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Shin Kumagai, Nobuhiko Ando, Kyosho Uryu, Takahiro Yamazaki
  • Patent number: 10457321
    Abstract: An electronic control unit diagnoses a short failure of an inverter FETs and diagnoses whether the failure of the FET-short detecting section has occurred. The unit controls a motor through an inverter including a bridge having an upper-stage FETs and a lower-stage FETs via an MCU, having: an FET-short detecting section to detect a short failure of the upper-stage FETs and the lower-stage FETs based on respective connection point voltages of the upper-stage FETs and the lower-stage FETs; and a diagnostic function to detect a failure of the FET-short detecting section. The diagnostic function diagnoses the failure of the FET-short detecting section at start up and turns-OFF the upper-stage FETs and the lower-stage FETs when the failure is detected. The FET-short detecting section diagnoses the short failure of the upper-stage FETs and the lower-stage FETs when the failure of the FET-short detecting section is not detected.
    Type: Grant
    Filed: September 24, 2018
    Date of Patent: October 29, 2019
    Assignee: NSK LTD.
    Inventors: Shin Kumagai, Kyosho Uryu, Nobuhiko Ando
  • Publication number: 20190308657
    Abstract: [Problem] An object of the present invention is to provide a motor control unit that driving-controls a motor having the dual-system windings, even in a case that one driving control system is an abnormality (including a failure), turns-ON of one common reverse-connection protection-FET by a driving signal of the other normal driving control system, and achieves a miniaturization and a reduction in costs, an electric power steering apparatus that is equipped with the motor control unit, and a vehicle.
    Type: Application
    Filed: May 23, 2017
    Publication date: October 10, 2019
    Applicant: NSK LTD.
    Inventors: Kyosho URYU, Shin KUMAGAI
  • Patent number: 10377413
    Abstract: An electronic control unit diagnoses a short failure of an inverter FETs and diagnoses whether the failure of the FET-short detecting section has occurred. The unit controls a motor through an inverter including a bridge having an upper-stage FETs and a lower-stage FETs via an MCU, having: an FET-short detecting section to detect a short failure of the upper-stage FETs and the lower-stage FETs based on respective connection point voltages of the upper-stage FETs and the lower-stage FETs; and a diagnostic function to detect a failure of the FET-short detecting section. The diagnostic function diagnoses the failure of the FET-short detecting section at start up and turns-OFF the upper-stage FETs and the lower-stage FETs when the failure is detected. The FET-short detecting section diagnoses the short failure of the upper-stage FETs and the lower-stage FETs when the failure of the FET-short detecting section is not detected.
    Type: Grant
    Filed: September 24, 2018
    Date of Patent: August 13, 2019
    Assignee: NSK LTD.
    Inventors: Shin Kumagai, Kyosho Uryu, Nobuhiko Ando
  • Patent number: 10259491
    Abstract: An electric power steering apparatus that drive-controls a motor by an inverter, and a motor release-switch is connected between the inverter and the motor, comprising: a control section to detect an assist state on a driving control system and to ON/OFF-switch a control of the inverter based on a detection result; a motor rotational number detecting section to detect a rotational number of the motor; an energy calculating section to calculate an energy of a motor back-EMF and a regenerative current based on the rotational number; and a judging section to compare the energy with an area of safety operation of the motor release-switch and to OFF-switch the d motor release-switch when the energy becomes within the area of safety operation. As occasion demands, the area of safety operation is calculated with the temperature.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: April 16, 2019
    Assignee: NSK LTD.
    Inventors: Naoto Shinkawa, Shigeru Fukinuki, Shin Kumagai, Shigeru Shimakawa, Teruyoshi Kogure
  • Publication number: 20190092382
    Abstract: A motor control unit that is connected to a motor release switch which includes FETs and is disposed between an inverter and a motor, including: a control section to detect an assist state of the inverter, to turn-ON or turn-OFF a control of the inverter based on a detection result and to detect whether abnormality is existed or not; a motor rotational speed detecting section to detect a motor rotational speed; an energy calculating section to calculate an energy based on the motor rotational speed; a judging section to turn-OFF all of the FETs of the motor release switch when the energy is within an area of safety operation; and a state detecting section to detect whether abnormality is existed or not based on information from an abnormality detecting section that detects abnormality of the sensors and the inverter, wherein the control section turns-ON the control of the inverter when the state detecting section does not detect abnormality and turns-OFF the control of the inverter when the state detecting se
    Type: Application
    Filed: March 2, 2017
    Publication date: March 28, 2019
    Applicant: NSK LTD.
    Inventors: Teruyoshi KOGURE, Shigeru SHIMAKAWA, Shin KUMAGAI, Ryoichi SUZUKI
  • Patent number: 10225927
    Abstract: A substrate provided in proximity to a case for improving heat radiation, and maintaining electrical insulation between the substrate and the case even when the substrate is warped, in the substrate having electronic parts mounted thereon and a case for housing the substrate. A case body of the case has a substrate placement surface for placing the substrate, the substrate placement surface is provided with a protruding portion protruding therefrom, and the substrate is fixed on the substrate placement surface, via a thermal interface material disposed on the substrate placement surface from a periphery of the protruding portion.
    Type: Grant
    Filed: November 25, 2016
    Date of Patent: March 5, 2019
    Assignee: NSK LTD.
    Inventors: Masakazu Morimoto, Noboru Kaneko, Shin Kumagai
  • Publication number: 20190031232
    Abstract: An electronic control unit diagnoses a short failure of an inverter FETs and diagnoses whether the failure of the FET-short detecting section has occurred. The unit controls a motor through an inverter including a bridge having an upper-stage FETs and a lower-stage FETs via an MCU, having: an FET-short detecting section to detect a short failure of the upper-stage FETs and the lower-stage FETs based on respective connection point voltages of the upper-stage FETs and the lower-stage FETs; and a diagnostic function to detect a failure of the FET-short detecting section. The diagnostic function diagnoses the failure of the FET-short detecting section at start up and turns-OFF the upper-stage FETs and the lower-stage FETs when the failure is detected. The FET-short detecting section diagnoses the short failure of the upper-stage FETs and the lower-stage FETs when the failure of the FET-short detecting section is not detected.
    Type: Application
    Filed: September 24, 2018
    Publication date: January 31, 2019
    Applicant: NSK LTD.
    Inventors: Shin KUMAGAI, Kyosho URYU, Nobuhiko ANDO
  • Publication number: 20190023317
    Abstract: An electronic control unit diagnoses a short failure of an inverter FETs and diagnoses whether the failure of the FET-short detecting section has occurred. The unit controls a motor through an inverter including a bridge having an upper-stage FETs and a lower-stage FETs via an MCU, having: an FET-short detecting section to detect a short failure of the upper-stage FETs and the lower-stage FETs based on respective connection point voltages of the upper-stage FETs and the lower-stage FETs; and a diagnostic function to detect a failure of the FET-short detecting section. The diagnostic function diagnoses the failure of the FET-short detecting section at start up and turns-OFF the upper-stage FETs and the lower-stage FETs when the failure is detected. The FET-short detecting section diagnoses the short failure of the upper-stage FETs and the lower-stage FETs when the failure of the FET-short detecting section is not detected.
    Type: Application
    Filed: September 24, 2018
    Publication date: January 24, 2019
    Applicant: NSK LTD.
    Inventors: Shin KUMAGAI, Kyosho URYU, Nobuhiko ANDO
  • Publication number: 20190023316
    Abstract: An electronic control unit diagnoses a short failure of an inverter FETs and diagnoses whether the failure of the FET-short detecting section has occurred. The unit controls a motor through an inverter including a bridge having an upper-stage FETs and a lower-stage FETs via an MCU, having: an FET-short detecting section to detect a short failure of the upper-stage FETs and the lower-stage FETs based on respective connection point voltages of the upper-stage FETs and the lower-stage FETs; and a diagnostic function to detect a failure of the FET-short detecting section. The diagnostic function diagnoses the failure of the FET-short detecting section at start up and turns-OFF the upper-stage FETs and the lower-stage FETs when the failure is detected. The FET-short detecting section diagnoses the short failure of the upper-stage FETs and the lower-stage FETs when the failure of the FET-short detecting section is not detected.
    Type: Application
    Filed: September 24, 2018
    Publication date: January 24, 2019
    Applicant: NSK LTD.
    Inventors: Shin KUMAGAI, Kyosho URYU, Nobuhiko ANDO
  • Publication number: 20180343737
    Abstract: A substrate provided in proximity to a case for improving heat radiation, and maintaining electrical insulation between the substrate and the case even when the substrate is warped, in the substrate having electronic parts mounted thereon and a case for housing the substrate. A case body of the case has a substrate placement surface for placing the substrate, the substrate placement surface is provided with a protruding portion protruding therefrom, and the substrate is fixed on the substrate placement surface, via a thermal interface material disposed on the substrate placement surface from a periphery of the protruding portion.
    Type: Application
    Filed: November 25, 2016
    Publication date: November 29, 2018
    Applicant: NSK LTD.
    Inventors: Masakazu MORIMOTO, Noboru KANEKO, Shin KUMAGAI
  • Publication number: 20180339726
    Abstract: An electronic control unit where an external watch dog timer (WDT) can always normally detect an abnormality (a failure) to a micro controller unit (MCU) related to a built-in self-test (BIST) function and which can maintain safety of a system. The control unit includes an external WDT to detect an abnormality of the MCU, a reset circuit to reset the MCU when the external WDT detects the abnormality of the MCU, and an ON/OFF control section to turn a gate of the semiconductor switching device on or off in accordance with the external WDT. The inverter is stopped by turning the gate off via the ON/OFF control section when the external WDT is a disable state. When the abnormality of the MCU is not detected in an enable state, the inverter is driven by turning the gate on via the ON/OFF control section. When the abnormality of the MCU is detected, the inverter is stopped by turning the gate off via the ON/OFF control section and the MCU is reset by the reset circuit.
    Type: Application
    Filed: November 22, 2016
    Publication date: November 29, 2018
    Applicants: NSK Ltd., TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Shin KUMAGAI, Nobuhiko ANDO, Kyosho URYU, Takahiro YAMAZAKI