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公开(公告)号：US10059368B2
公开(公告)日：2018-08-28
申请号：US15512713
申请日：2015-12-24
Applicant: NSK LTD.
Inventor： Toru Sakaguchi , Shoya Maruyama
CPC classification number: B62D5/0463 , B62D5/0469 , B62D6/02 , B62D6/08 , G05B13/041
Abstract: An electric power steering apparatus includes a control section that includes a feed-back control section which sets a viscoelastic model as a reference model within a predetermined angle at front of a rack end. The feed-back control section includes a feed-back element to calculate a target rack displacement based on an input-side rack axial force and a control element to output an output-side rack axial force based on a position deviation between the target rack displacement and a rack displacement.
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公开(公告)号：US10023226B2
公开(公告)日：2018-07-17
申请号：US15520577
申请日：2015-12-24
Applicant: NSK Ltd.
Inventor： Toru Sakaguchi , Toshikazu Onoe , Satoshi Shimokawabe
Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that constitutes a control system based on a physical model, constitutes a model following control that an output (a distance to a rack end) of a controlled object follows-up to a reference model, suppresses the occurrences of a noisy sound and a shock force at an end hitting without giving any uncomfortable steering feeling to a driver, and is capable of smoothly steering.[Means for solving the problem]In the electric power steering apparatus that calculates a first current command value based on at least a steering torque and performs an assist-control of a steering system by driving a motor based on the first current command value, the apparatus comprises a configuration of a model following control comprising a feed-back control section including a viscoelastic model as a reference model within a predetermined angle at front of a rack end, wherein the configuration of the model following control comprises a feed-back control section, and the model following control has a noise-reducing function to reduce a noise so as to suppress a rack end hitting.
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3.发明授权Motor control apparatus and electric power steering apparatus provided with the same 有权电动机控制装置及配备有该动力转向装置公开(公告)号：US08831832B2
公开(公告)日：2014-09-09
申请号：US14234176
申请日：2013-03-28
Applicant: NSK Ltd.
Inventor： Yuzuru Hoshi , Toru Sakaguchi , Sachio Nakayama , Masahiro Maeda , Kenji Mori , Yousuke Imamura
CPC classification number: H02P21/0035 , B60T8/1755 , B62D5/046 , B62D5/0463 , B62D5/0484 , B62D5/049 , B62D6/003 , B62D6/008 , B62D7/159 , H02M7/5395 , H02M2001/0009 , H02P6/08 , H02P29/0241
Abstract: A motor control apparatus that is capable of making the whole control system robust not only with respect to motor parameter variations such as the temperature variation and the manufacturing unevenness but also with respect to disturbances while using a cheap and compact one-shunt type current detecting circuit and simultaneously diagnosing an estimation error and an electric power steering apparatus provide with the motor control apparatus.
Abstract translation: 一种电动机控制装置，其能够使整个控制系统不仅在诸如温度变化和制造不均匀性之间的电动机参数变化方面稳固，而且在使用便宜且紧凑的单分流型电流检测电路 同时诊断估计误差和电动助力转向装置提供电动机控制装置。
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4.发明申请公开(公告)号：US20140156144A1
公开(公告)日：2014-06-05
申请号：US14234176
申请日：2013-03-28
Applicant: NSK LTD.
Inventor： Yuzuru Hoshi , Toru Sakaguchi , Sachio Nakayama , Masahiro Maeda , Kenji Mori , Yousuke Imamura
CPC classification number: H02P21/0035 , B60T8/1755 , B62D5/046 , B62D5/0463 , B62D5/0484 , B62D5/049 , B62D6/003 , B62D6/008 , B62D7/159 , H02M7/5395 , H02M2001/0009 , H02P6/08 , H02P29/0241
Abstract: A motor control apparatus that is capable of making the whole control system robust not only with respect to motor parameter variations such as the temperature variation and the manufacturing unevenness but also with respect to disturbances while using a cheap and compact one-shunt type current detecting circuit and simultaneously diagnosing an estimation error and an electric power steering apparatus provide with the motor control apparatus.
Abstract translation: 一种电动机控制装置，其能够使整个控制系统不仅在诸如温度变化和制造不均匀性之间的电动机参数变化方面稳固，而且在使用便宜且紧凑的单分流型电流检测电路 同时诊断估计误差和电动助力转向装置提供电动机控制装置。
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公开(公告)号：US10214232B2
公开(公告)日：2019-02-26
申请号：US15031883
申请日：2015-06-04
Applicant: NSK Ltd.
Inventor： Toru Sakaguchi , Shoya Maruyama
Abstract: A safe electric power steering apparatus with a good steering feeling is provided that includes a function for getting out from restraint of a lateral flow or a one-sided flow, and enables acquisition of a better effect that a driver's load is reduced in the lateral flow or the one-sided flow. The safe electric power steering apparatus corrects a current command value by a motor current correction value based on a motor correction signal.
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Patent Agency Ranking
公开(公告)号：US09796412B2
公开(公告)日：2017-10-24
申请号：US15103037
申请日：2015-06-04
Applicant: NSK Ltd.
Inventor： Toru Sakaguchi
CPC classification number: B62D5/0463 , B62D6/02 , B62D6/04 , B62D6/10 , B62D15/0215
Abstract: An electric power steering apparatus with a good steering feeling that includes a function for getting out from restraint of a lateral flow or a one-sided flow, and enables acquisition of a better effect that a driver's load is reduced in the lateral flow or the one-sided flow.
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公开(公告)号：US11352053B2
公开(公告)日：2022-06-07
申请号：US17287778
申请日：2020-10-21
Applicant: NSK LTD.
Inventor： Toru Sakaguchi , Tetsuya Kitazume , Shoya Maruyama
Abstract: A turning control device includes: a target steering angle calculation unit configured to calculate a target steering angle of a turning mechanism, based on a second steering angle of a steering mechanism; a steering angular displacement calculation unit configured to, when a third steering angle, the third steering angle being either a first steering angle of the turning mechanism or the second steering angle, is in a range from a maximum steering angle that the third steering angle can take to a first threshold steering angle, calculate a steering angular displacement of the third steering angle with the first threshold steering angle used as a reference; a steering angle correction value calculation unit configured to calculate a steering angle correction value according to at least the steering angular displacement; and a corrected target steering angle calculation unit configured to correct the target steering angle with the steering angle correction value.
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公开(公告)号：US10173719B2
公开(公告)日：2019-01-08
申请号：US15522418
申请日：2015-12-24
Applicant: NSK Ltd.
Inventor： Toru Sakaguchi , Toshikazu Onoe
Abstract: An electric power steering apparatus that calculates a first current command value based on at least a steering torque and performs an assist-control of a steering system by driving a motor based on the first current command value, including: a configuration of a model following control including a viscoelastic model as a reference model within a predetermined angle at front of a rack end, wherein an offset is given to input or output of the viscoelastic model for preventing an overheat, resulting in suppressing a rack end hitting.
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公开(公告)号：US11260902B2
公开(公告)日：2022-03-01
申请号：US17289007
申请日：2020-10-21
Applicant: NSK LTD.
Inventor： Toru Sakaguchi , Tetsuya Kitazume , Shoya Maruyama
Abstract: A turning control device includes: a steering angular displacement calculation unit configured to, when a third steering angle that is either a first steering angle of a turning mechanism or a second steering angle of a steering mechanism, is in an angular range from a maximum angle to a threshold steering angle, calculate a steering angular displacement of the third steering angle with the threshold steering angle used as a reference; a steering angle correction value calculation unit configured to calculate a steering angle correction value according to at least the steering angular displacement; a steering angle correction value limiting unit configured to limit the steering angle correction value according to at least a steering state, the third steering angle, and angular velocity thereof; a corrected target steering angle calculation unit configured to correct the target steering angle of the turning mechanism with a limited steering angle correction value.
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公开(公告)号：US10946891B2
公开(公告)日：2021-03-16
申请号：US16333356
申请日：2018-03-06
Applicant: NSK Ltd.
Inventor： Toru Sakaguchi , Shoya Maruyama
Abstract: An electric power steering apparatus that suppresses occurrence of an abnormal noise at end hitting without providing uncomfortable feeling of steering for a driver, attenuates impact force, and enables suppression of the abnormal noise without making a turning radius worse. The apparatus includes a viscoelastic model following control section that sets a viscoelastic model as a reference model within a predetermined range in front of a rack end, and outputs a control output to correct a current command value; and a rack end approach judging section that performs judgment of being in the predetermined range in front of the rack end based on steering position information; adjusts the control output based on at least the steering position information, a steering velocity and a steering state, and corrects the current command value by the adjusted control output.
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