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公开(公告)号：US20160001813A1
公开(公告)日：2016-01-07
申请号：US14857882
申请日：2015-09-18
Applicant: NSK LTD.
Inventor： Satoh KOUICHI , Keiji KASHIMOTO , Haruhiko KAMIGUCHI
IPC: B62D5/04
CPC classification number: B62D5/0463 , B62D5/0421 , B62D5/0469 , B62D5/0481 , B62D5/0496 , H02P6/28 , H02P29/028 , H02P29/032
Abstract: An electric power steering apparatus for generating a PWM signal based on a calculated steering assist command value, PWM-controlling a motor via a motor drive circuit including switching elements, and assist-controlling a steering system that a motor relay is inserted between the motor drive circuit and the motor, comprises a steering status detecting section that detects a steering status of a steering wheel, outputs a longtime steering holding signal when detecting that the steering status is a longtime steering holding status, and outputs a normal steering signal when detecting that the steering status is a normal steering status, and a motor current control section that determines a motor current control value for controlling a motor current flowing in the motor relay in accordance with the longtime steering holding signal or the normal steering signal.
Abstract translation: 一种电动助力转向装置，用于基于计算出的转向辅助指令值产生PWM信号，经由包括开关元件的电动机驱动电路对电动机进行PWM控制，以及辅助控制电动机继电器插入电动机驱动 电路和电动机包括检测方向盘的转向状态的转向状态检测部，当检测到转向状态为长时间转向保持状态时输出长时间转向保持信号，并且当检测到转向状态时，输出正常转向信号 转向状态是正常的转向状态，以及电动机电流控制部，其根据长时间的转向保持信号或正常的转向信号，确定用于控制在电动机继电器中流动的电动机电流的电动机电流控制值。
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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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