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公开(公告)号：US20190031232A1
公开(公告)日：2019-01-31
申请号：US16139664
申请日：2018-09-24
Applicant: NSK LTD.
Inventor： Shin KUMAGAI , Kyosho URYU , Nobuhiko ANDO
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.
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公开(公告)号：US20170183029A1
公开(公告)日：2017-06-29
申请号：US14890045
申请日：2014-09-17
Applicant: NSK LTD.
Inventor： Kyosho URYU , Shin KUMAGAI
IPC: B62D5/04 , H02P27/08 , H02P29/028 , H02P29/024
CPC classification number: B62D5/0487 , B62D5/0463 , B62D5/0484 , H02P27/08 , H02P29/0243 , H02P29/028 , H02P29/032
Abstract: [Problem]_0 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.
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3.发明申请公开(公告)号：US20180343737A1
公开(公告)日：2018-11-29
申请号：US15774815
申请日：2016-11-25
Applicant: NSK LTD.
Inventor： Masakazu MORIMOTO , Noboru KANEKO , Shin KUMAGAI
IPC: H05K1/02 , H05K5/00 , H05K7/14 , B60R16/023
CPC classification number: H05K1/0271 , B60R16/02 , B60R16/0231 , B62D5/04 , H01L25/07 , H01L25/18 , H05K1/0203 , H05K5/0017 , H05K7/14 , H05K7/1427 , H05K7/20 , H05K2201/068
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.
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4.发明申请公开(公告)号：US20190308657A1
公开(公告)日：2019-10-10
申请号：US16306775
申请日：2017-05-23
Applicant: NSK LTD.
Inventor： Kyosho URYU , Shin KUMAGAI
IPC: B62D5/04 , H02P25/22 , H02P27/08 , H02M7/5387 , H02M1/08 , H02P29/024
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.[Means for Solving the Problem]The present invention is the motor control unit, comprising: an MCU to control the motor having dual-system motor windings, dual-system inverters to drive the respective dual-system motor windings via dual-system driving sections, and one reverse-connection protection-FET that is connected between the dual-system inverters and a power supply, wherein the reverse-connection protection-FET is turned-ON or turned-OFF by a logical sum of gate driving signals from the dual-system gate driving sections.
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公开(公告)号：US20180162440A1
公开(公告)日：2018-06-14
申请号：US15102387
申请日：2015-06-12
Applicant: NSK LTD.
Inventor： Kyosho URYU , Shin KUMAGAI
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.
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Patent Agency Ranking
公开(公告)号：US20180154931A1
公开(公告)日：2018-06-07
申请号：US15317572
申请日：2015-05-08
Applicant: NSK Ltd.
Inventor： Naoto SHINKAWA , Shigeru FUKINUKI , Shin KUMAGAI , Shigeru SHIMAKAWA , Teruyoshi KOGURE
CPC classification number: B62D5/0484 , B62D5/046 , B62D5/0481 , B62D5/0496 , H02P27/08 , H02P29/68
Abstract: [Problem]An object of the present invention is to provide a motor control apparatus that, with a high reliability, protects the motor release-switch comprising the semiconductor switching elements in small size and an electric power steering apparatus provided the same.[Means for solving the problem]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.
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公开(公告)号：US20170072995A1
公开(公告)日：2017-03-16
申请号：US14782089
申请日：2015-04-20
Applicant: NSK LTD.
Inventor： Shin KUMAGAI
CPC classification number: B62D5/0463 , B62D5/04 , B62D5/046 , B62D6/00 , G01R19/00 , H02P23/00 , H02P23/0004 , H02P27/08
Abstract: An electric power steering apparatus, without outside attachment circuit, that is capable of simultaneously sampling two phases of which the duties are not saturated and of cheaply detecting the 3-shunt currents by using two A/D converting units in correspondence to the duty saturation phase (the maximum phase) changing when the motor is rotated. The apparatus calculates a current command value due to at least a steering torque, performs a PWM-control of a 3-phase motor through an inverter based on the current command value, and assist-controls a steering system of a vehicle by detecting currents of the 3-phase motor and feed-backing.
Abstract translation: 一种没有外部附接电路的电动助力转向装置，其能够同时对其中不饱和任务的两相进行采样，并且通过使用与占空比饱和相位对应的两个A / D转换单元便宜地检测3分流电流 （最大相位）在电机旋转时发生变化。 该装置由至少转向转矩计算出电流指令值，通过逆变器基于电流指令值进行三相电动机的PWM控制，并通过检测车辆的转向系统的电流来辅助车辆的转向系统 三相电机和馈电支架。
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公开(公告)号：US20190023317A1
公开(公告)日：2019-01-24
申请号：US16139635
申请日：2018-09-24
Applicant: NSK LTD.
Inventor： Shin KUMAGAI , Kyosho URYU , Nobuhiko ANDO
CPC classification number: B62D5/0484 , B60Y2400/3086 , B62D5/04 , B62D5/046 , B62D5/0463 , B62D5/0487 , B62D6/00 , H02M1/32 , H02M1/36 , H02M7/48 , H02M7/53871 , H02P27/06 , H02P27/08 , H02P29/0241 , H03K17/0822
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.
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公开(公告)号：US20190023316A1
公开(公告)日：2019-01-24
申请号：US16139585
申请日：2018-09-24
Applicant: NSK LTD.
Inventor： Shin KUMAGAI , Kyosho URYU , Nobuhiko ANDO
CPC classification number: B62D5/0484 , B60Y2400/3086 , B62D5/04 , B62D5/046 , B62D5/0463 , B62D5/0487 , B62D6/00 , G01R31/3275 , H02M1/32 , H02M1/36 , H02M7/48 , H02M7/53871 , H02P27/06 , H02P27/08 , H02P29/0241 , H03K17/0822
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.
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公开(公告)号：US20170267278A1
公开(公告)日：2017-09-21
申请号：US15504723
申请日：2014-09-17
Applicant: NSK LTD.
Inventor： Kyosho URYU , Shin KUMAGAI
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.
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