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Patent Agency Ranking
公开(公告)号：US20190337559A1
公开(公告)日：2019-11-07
申请号：US16063428
申请日：2017-11-08
Applicant: NSK LTD.
Inventor： Takahiro TSUBAKI , Haruhiko KAMIGUCHI , Tomohiro MIURA , Nobuaki KOGURE
Abstract: [Problem]An object of the present invention is to provide an electric power steering apparatus that enables more precise estimation of a coil temperature by considering a heat transfer phenomenon between a control substrate and a coil in addition to a heat transfer phenomenon between respective phases of a poly-phase coil for a poly-phase motor having a multi-system motor winding, and enables the estimation of the coil temperature even when an abnormality occurs in any of the systems.[Means for Solving the Problem]An electric power steering apparatus comprises a temperature sensor that detects a substrate temperature of the control substrate; and a coil temperature estimating section that obtains coil calorific values of respective phases of the poly-phase motor and a substrate calorific value of the control substrate by a motor current of the phase, and estimates a coil temperature of the phase by the coil calorific value, the substrate calorific value and the substrate temperature based on a heat transfer phenomenon between the respective phases that is caused by a difference in temperature between coils of the respective phases and a heat transfer phenomenon between the coil and the control substrate; the coil temperature estimating section estimates the coil temperature by values that are obtained by correcting the coil calorific value and the substrate calorific value that are obtained in a normal system, and the substrate temperature, when an abnormality occurs in any of systems; and the heat transfer phenomenon is expressed by a differential equation.
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公开(公告)号：US20190267926A1
公开(公告)日：2019-08-29
申请号：US16348398
申请日：2017-11-08
Applicant: NSK Ltd.
Inventor： Takahiro TSUBAKI , Tomohiro MIURA , Takashi SUNAGA , Nobuaki KOGURE , Haruhiko KAMIGUCHI
Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that enables more precise estimation of a coil temperature for a poly-phase motor by considering a heat transfer phenomenon between a control substrate and a coil in addition to a heat transfer phenomenon between the coils.[Means for solving the problem] An electric power steering apparatus that comprises a control substrate that controls a poly-phase motor having two-system motor windings, comprises a temperature sensor that detects a substrate temperature of the control substrate, and a coil temperature estimating section that estimates all coil temperatures by all motor currents of the poly-phase motor and the substrate temperature based on a heat transfer phenomenon between all coils that is caused by a difference in temperature between the all coils and a heat transfer phenomenon between the coil and the control substrate.
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公开(公告)号：US20190337560A1
公开(公告)日：2019-11-07
申请号：US16070973
申请日：2017-07-04
Applicant: NSK LTD.
Inventor： Takahiro TSUBAKI , Tomohiro MIURA , Takashi SUNAGA , Nobuaki KOGURE
Abstract: An electric power steering apparatus that enables more precise estimation of a coil temperature by considering a heat transfer phenomenon between a control substrate and a poly-phase coil in addition to a heat transfer phenomenon between respective phases of the coil. The apparatus includes a control substrate that controls a poly-phase motor, a temperature sensor that detects a substrate temperature of the control substrate and a coil temperature estimating section that estimates coil temperatures of respective phases of the poly-phase motor by a motor current of the phase and the substrate temperature based on a heat transfer phenomenon between the respective phases that is caused by a difference in temperature between coils of the respective phases and a heat transfer phenomenon between the coil and the control substrate.
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公开(公告)号：US20170279394A1
公开(公告)日：2017-09-28
申请号：US14648086
申请日：2014-12-19
Applicant: NSK LTD.
Inventor： Tomohiro MIURA , Masahiro MAEDA , Yousuke IMAMURA
Abstract: A motor control apparatus that calculates duty command values of respective phases for controlling currents of a motor by means of a control calculation, forms PWM-signals in correspondence to the duty command values, drives the motor by means of an inverter based on the PWM-signals, and which is provided a rotation sensor to detect a motor angle of the motor.
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公开(公告)号：US20160280257A1
公开(公告)日：2016-09-29
申请号：US14653719
申请日：2014-12-25
Applicant: NSK LTD.
Inventor： Tomohiro MIURA
IPC: B62D5/04
CPC classification number: B62D5/0481 , B62D5/0409 , B62D5/0484
Abstract: To detect and store occurrence of a reverse connection when the reverse connection has occurred, and to restricts a power assist at the next startup of a controller. In an ECU for controlling an electric motor that applies a steering assist torque on a steering mechanism, a microcomputer transmits a drive signal to a driver that drives an inverter, which controls current of the electric motor, in accordance with the drive signal. A reverse connection storage circuit is attached in parallel with the inverter, and detects and stores the occurrence of the reverse connection when the reverse connection of the ECU and a battery has occurred, and notifies the microcomputer of the occurrence of the reverse connection at the next startup of the ECU. The microcomputer transmits a signal indicating non-permission to the driver in accordance with the notification. The driver restricts the power assist upon receiving the signal.
Abstract translation: 当发生反向连接时检测并存储反向连接的发生，并且在下次启动控制器时限制功率辅助。 在用于控制在转向机构上施加转向辅助转矩的电动机的ECU中，微型计算机根据驱动信号向驱动控制电动机的逆变器的驱动器发送驱动信号。 反向连接存储电路与逆变器并联安装，当发生ECU和电池的反向连接时，检测并存储反向连接的发生，并在下一个通知微机上发生反向连接 启动ECU。 微型计算机根据通知向驾驶员发送指示不允许的信号。 驱动器在接收到信号时限制功率辅助。
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