公开(公告)号：US09932067B2

公开(公告)日：2018-04-03

申请号：US15504723

申请日：2014-09-17

Applicant: NSK LTD.

Inventor： Kyosho Uryu ,  Shin Kumagai

IPC: H02P1/04 ,  B62D5/04 ,  H02P6/16 ,  H02P6/08 ,  H02P6/12

CPC classification number: B62D5/0484 ,  B62D5/0463 ,  B62D5/0487 ,  B62D5/049 ,  H02P6/085 ,  H02P6/12 ,  H02P6/16

Abstract: An electric power steering apparatus that calculates a current command value based on at least a steering torque, performs a PWM-control of a brushless motor by an inverter based on the current command value, performs a current control by detecting a rotational angle of the brushless motor, and performs an assist-control of a steering system. The apparatus includes three rotational angle detecting systems to detect three rotational angles of the brushless motor; and an angle diagnosing section that compares absolute values of differences on respective angles outputted from the three rotational angle detecting systems with a threshold, and performs a process by diagnosing whether the rotational angle detecting systems are normal or abnormal; wherein the assist control is continuously performed by using output angles outputted from systems diagnosed as being normal.

公开(公告)号：US10543869B2

公开(公告)日：2020-01-28

申请号：US16139664

申请日：2018-09-24

Applicant: NSK LTD.

Inventor： Shin Kumagai ,  Kyosho Uryu ,  Nobuhiko Ando

IPC: B62D5/04 ,  H02M1/32 ,  H03K17/082 ,  H02P29/024 ,  H02P27/06 ,  H02M1/36 ,  H02M7/5387 ,  H02P27/08 ,  B62D6/00 ,  H02M7/48 ,  G01R31/327

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.

公开(公告)号：US10077070B2

公开(公告)日：2018-09-18

申请号：US15102387

申请日：2015-06-12

Applicant: NSK LTD.

Inventor： Kyosho Uryu ,  Shin Kumagai

IPC: B62D5/04 ,  G07C5/08

CPC classification number: B62D5/049 ,  B60R16/02 ,  B62D5/04 ,  B62D5/0463 ,  B62D5/0484 ,  B62D6/00 ,  G07C5/0808

Abstract: A power-source voltage diagnostic device of an electric power steering apparatus that improves the performance for the anomalous detection of the motor power-source voltage VR-detecting circuit and is capable of continuing the assist control even if the extraordinary state is detected. When the failure (extraordinary state) detection of the VR-detecting circuit is performed by using the correlation between Vbat1-voltage obtained by the detecting section (Vbat1-detecting circuit) to detect the control voltage from the control power-source circuit and VR-voltage obtained by the detecting circuit (VR-detecting circuit) to detect the motor power-source voltage from the power source circuit, multiplexing is performed by providing VR-detecting circuits (VR-detecting circuit 1, VR-detecting circuit 2) of two systems and mutually comparing them so as to accurately perform the failure diagnosis of the VR-detecting circuits.

公开(公告)号：US10227086B2

公开(公告)日：2019-03-12

申请号：US15507814

申请日：2015-09-02

Applicant: NSK LTD.

Inventor： Kyosho Uryu ,  Shigeru Fukinuki

IPC: B62D5/04 ,  H02P6/28 ,  B62D6/08 ,  H02P6/12 ,  H02P27/06

Abstract: A motor control unit which drives a motor through an inverter based on a calculated command value of a control section to which a power supply voltage is supplied, including: a charging/discharging mechanism for charging and discharging electric charges of an inverter voltage supplied to the inverter; and a separation means for separating the charging/discharging mechanism from the power supply voltage, wherein when a warning signal informing of a drop in the power supply voltage is inputted, the charging/discharging mechanism is separated from the power supply voltage by the separation means as well as a voltage is applied to the control section from the charging/discharging mechanism to avoid power supply reset of the control section. The motor may be a motor with multi-system windings.

公开(公告)号：US09862409B2

公开(公告)日：2018-01-09

申请号：US14890045

申请日：2014-09-17

Applicant: NSK LTD.

Inventor： Kyosho Uryu ,  Shin Kumagai

IPC: H02P1/04 ,  H02P3/00 ,  H02P27/06 ,  B62D5/04 ,  H02P29/024 ,  H02P27/08 ,  H02P29/028

CPC classification number: B62D5/0487 ,  B62D5/0463 ,  B62D5/0484 ,  H02P27/08 ,  H02P29/0243 ,  H02P29/028 ,  H02P29/032

Abstract: [Problem]An object of the present invention is to provide an electric power steering apparatus that has a 3-shunt control function to perform a 3-shunt PWM-control for raising a reliability of the apparatus and for improving a stability, and a 1-shunt control function to perform a 1-shunt PWM-control so as to continue an assist control when the 3-shunt control function is damaged.[Means for solving the problem]The electric power steering apparatus according to the present invention, having: a 3-shunt control function to perform a 3-shunt PWM-control with a first 3-phase detected current values based on down-stream 3-shunt; a 1-shunt control function to perform a 1-shunt PWM-control with a second 3-phase detected current values based on down-stream 1-shunt; and a switching function to switch from the 3-shunt control function to the 1-shunt function when a failure of current detection circuit system in relation to the first 3-phase detected current values is detected.

公开(公告)号：US12214829B2

公开(公告)日：2025-02-04

申请号：US18721458

申请日：2022-12-08

Applicant: NSK LTD.

Inventor： Takayuki Kobayashi ,  Kyosho Uryu

IPC: H02P1/30 ,  B62D5/04 ,  H02P1/52 ,  H02P3/00 ,  H02P27/08

Abstract: A current detection device includes a current detection unit configured to detect current flowing through a switching element of a lower-side arm; a correction value calculation unit configured to calculate an offset correction value, based on a detection value of the current detected by the current detection unit in a period during which the switching element off during PWM control, and to hold and update the calculated offset correction value; and a correction unit configured to correct, by the offset correction value held by the correction value calculation unit, the detection value of the current detected by the current detection unit in a period during which the switching element is on. The correction value calculation unit is configured to not update the offset correction value in a case where a duty ratio of the PWM control is equal to or less than a duty ratio lower limit value.

公开(公告)号：US10093351B2

公开(公告)日：2018-10-09

申请号：US15746682

申请日：2016-08-05

Applicant: NSK LTD.

Inventor： Shin Kumagai ,  Kyosho Uryu ,  Nobuhiko Ando

IPC: B62D5/04 ,  H02M7/5387 ,  H02M1/36 ,  H02P27/08

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.

公开(公告)号：US10471984B2

公开(公告)日：2019-11-12

申请号：US15776907

申请日：2016-11-22

Applicant: NSK Ltd. ,  TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION

Inventor： Shin Kumagai ,  Nobuhiko Ando ,  Kyosho Uryu ,  Takahiro Yamazaki

IPC: B62D5/04 ,  H02P27/06 ,  H02M7/48 ,  B62D6/00 ,  G06F11/30 ,  H02M1/32 ,  H02M7/5387 ,  H02P29/024

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.

公开(公告)号：US10457321B2

公开(公告)日：2019-10-29

申请号：US16139585

申请日：2018-09-24

Applicant: NSK LTD.

Inventor： Shin Kumagai ,  Kyosho Uryu ,  Nobuhiko Ando

IPC: B62D5/04 ,  H02P27/06 ,  H02M1/36 ,  H02M7/5387 ,  H02P27/08 ,  H02M1/32 ,  B62D6/00 ,  H02M7/48 ,  H03K17/082 ,  H02P29/024

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.

公开(公告)号：US10377413B2

公开(公告)日：2019-08-13

申请号：US16139635

申请日：2018-09-24

Applicant: NSK LTD.

Inventor： Shin Kumagai ,  Kyosho Uryu ,  Nobuhiko Ando

IPC: B62D5/04 ,  B62D6/00 ,  H02M1/32 ,  H02M1/36 ,  H02M7/48 ,  H02P27/06 ,  H02P27/08 ,  G01R31/327 ,  H02M7/5387 ,  H02P29/024 ,  H03K17/082

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.