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公开(公告)号：US20170331398A1
公开(公告)日：2017-11-16
申请号：US15536396
申请日：2016-02-02
Applicant: NSK Ltd.
Inventor： Takayoshi SUGAWARA , Ryo MINAKI , Hideki SAWADA
CPC classification number: H02P6/085 , B62D5/046 , B62D5/0469 , B62D5/0496 , H02P6/04 , H02P6/10 , H02P6/17 , H02P6/185 , H02P23/00 , H02P29/64
Abstract: [Problem]An object of the present invention is to provide a motor control unit that the heat generation of FETs is not concentrated in one FET and the heat generation is distributed to the plural FETs by operating the duties of all three-phases in a case that the driving of the motor is stopped.[Means for Solving the Problem]The present invention is the motor control unit comprising a current detector; an upper-stage maximum heat generation-phase specifying means to calculate respective heat generation amounts of upper-stage FETs and specify an upper-stage maximum heat generation phase; a lower-stage maximum heat generation-phase specifying means to calculate respective heat generation amounts of lower-stage FETs and specify a lower-stage maximum heat generation phase; an upper-stage selecting means to select an upper-stage selecting duty and an upper-stage selecting phase current based on the upper-stage maximum heat generation phase; a lower-stage selecting means to select a lower-stage selecting duty and a lower-stage selecting phase current based on the lower-stage maximum heat generation phase; a duty operating amount calculating section to calculate a duty operating amount; and a duty operating section to operate the respective phase duties based on the duty operating amount.
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公开(公告)号：US20170274928A1
公开(公告)日：2017-09-28
申请号：US15512348
申请日：2015-11-30
Applicant: NSK LTD.
Inventor： Ryo MINAKI , Takayoshi SUGAWARA , Hideki SAWADA
CPC classification number: B62D5/0463 , B62D1/286 , B62D5/04 , B62D15/02 , B62D15/021 , B62D15/0285
Abstract: [Problem]An object of the present invention is to provide an electric power steering apparatus capable of smoothly switching the control systems without self-steer by gradually changing a control torque of the torque control and a command value of the position/speed control upon the fade processing[Means for solving the problem]The present invention is the electric power steering apparatus including a torque sensor to detect a steering torque and a motor control unit to control a motor that applies an assist torque to a steering system of a vehicle, comprising: a function to switch a control system of the motor between a torque control system to control a motor output torque and a position/speed control system to control a steering angle of a steering in accordance with a predetermined switching trigger, wherein a fade processing which switches from the torque control system to the position/speed control system or vice versa.
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23.发明申请公开(公告)号：US20160248351A1
公开(公告)日：2016-08-25
申请号：US15145858
申请日：2016-05-04
Applicant: NSK LTD.
Inventor： Takayoshi SUGAWARA , Yousuke IMAMURA , Hiroyasu KUMAGAI
CPC classification number: H02P6/10 , B62D5/046 , B62D5/0472 , H02P6/15 , H02P6/28 , H02P21/22 , H02P23/14
Abstract: A multi-phase motor control apparatus that reduces the occurrence of the vibrations and the noises by setting the shift amount per time more finely after realizing a reduction in processing ability of a CPU by using a one-shunt type current detection circuit and an electric power steering apparatus using the same. The apparatus includes a PWM-signal generating section that generates plural second each-phase PWM-signals within two control periods based on the current estimation value and the carrier signal, and in a case that a phase shift amount of a predetermined phase in a just before control period is zero and a phase shift amount of a predetermined phase in a present control period is not zero, the phase shift control section gradually increases the phase shift amount from zero in the present control period and a next control period, and uses the second each-phase PWM-signals in the next control period.
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公开(公告)号：US20200382032A1
公开(公告)日：2020-12-03
申请号：US16605874
申请日：2019-01-29
Applicant: NSK LTD.
Inventor： Hiroaki TAKASE , Ryo MINAKI , Takayoshi SUGAWARA
Abstract: A motor control unit that vector-controls a 3-phase brushless motor based on dq-axes current command values, converts 3-phase current detection values of the 3-phase brushless motor into dq-axes feedback currents, performs feedbacks of the dq-axes feedback currents to the dq-axes current command values, converts dq-axes deviation voltages of the feedbacks into 2-phase duty command values, converts the 2-phase duty command values into 3-phase duty command values, and vector-controls the 3-phase brushless motor via an inverter, comprising a dq-axes dead time compensating section to calculate dq-axes dead time compensation values of the inverter and perform a dead time compensation, and a dq-axes disturbance estimating observer to input the dq-axes current command values, a motor rotational number, the dq-axes feedback currents and the deviation voltage, and calculate and output dq-axes disturbance compensation values, wherein the motor control unit estimates a disturbance, which cannot be compensated by said dead time compensation of said inverter, by adding with the dq-axes disturbance compensation values and said dq-axes deviation voltages.
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公开(公告)号：US20200269905A1
公开(公告)日：2020-08-27
申请号：US16630664
申请日：2019-06-07
Applicant: NSK LTD.
Inventor： Takayoshi SUGAWARA , Takuya MASUKO , Tomoki FUKUDA , Hideki SAWADA
Abstract: An electric power steering system is provided that is capable of performing assist control in which a change in a steering feel is reduced. The electric power steering system includes a current command value calculating unit configured to output a current command value Iref1 in accordance with steering torque and a vehicle speed on the basis of an assist map. The current command value calculating unit includes a vibration component reducing section configured to reduce a vibration component resulting from vibrations for warning that have been transmitted to a steering wheel and included in the steering torque.
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Patent Agency Ranking
公开(公告)号：US20190382048A1
公开(公告)日：2019-12-19
申请号：US16479269
申请日：2018-02-19
Applicant: NSK LTD.
Inventor： Hideki SAWADA , Yukie FUJIWARA , Ryo MINAKI , Takayoshi SUGAWARA
Abstract: An electric power steering apparatus that drives and controls a motor which applies an assist orque to a steering system of a vehicle and has a function switching between an assist mode and an automatic mode, including a torsion bar torsional angle calculating section to calculate a torsion bar torsional angle based on a torque information, an output-side column shaft relative angle generating section to output an output-side relative angle from an electrical angle signal of the motor, an actual handle angle calculating section to calculate an actual handle angle based on the torsion bar torsional angle and the output-side relative angle, a resonance filter to obtain an estimated handle angle in a hands-off state from the output-side relative angle, and a hands-on/off judging section to judge a hands-on state when a time that a deviation angle between the actual handle angle and the estimated handle angle is equal to or more than a predetermined angle is continued for the predetermined time or more.
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公开(公告)号：US20190252972A1
公开(公告)日：2019-08-15
申请号：US16312682
申请日：2017-07-18
Applicant: NSK LTD.
Inventor： Ryo MINAKI , Hiroaki TAKASE , Hideki SAWADA , Takayoshi SUGAWARA
IPC: H02M1/38 , B62D5/04 , B62D6/00 , H02P21/22 , H02P21/13 , H02P27/08 , H02M7/5387 , H02P21/05 , H02P21/14
Abstract: [Problem]An object of the present invention is to provide an electric power steering apparatus of a vector control system that compensates a dead time of an inverter, a motor back-EMF and an interference voltage due to a mutual inductance between motor windings, improves a distortion of a current waveform and a responsibility of a current control, and suppresses a noise, vibration and a ripple.[Means for Solving the Problem]The present invention is the electric power steering apparatus that driving-controls a 3-phase brushless motor which applies an assist torque to a steering mechanism of a vehicle by using a current command value calculated based on at least a steering torque, and vector-controls the 3-phase brushless motor, via an inverter, by converting dq-axes command values converted from the current command value into 3-phase values, comprising a dq-axes disturbance observer to compensate respective axes disturbance voltages, which include a dead time of the inverter, for the dq-axes command values, or comprising: a dq-axes disturbance observer to compensate respective axes disturbance voltages, which include a dead time of the inverter, for the dq-axes command values and a spatial vector modulating section.
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公开(公告)号：US20180354550A1
公开(公告)日：2018-12-13
申请号：US15780502
申请日：2016-11-04
Applicant: NSK LTD.
Inventor： Hideki SAWADA , Takayoshi SUGAWARA , Ryo MINAKI
CPC classification number: B62D5/0463 , B62D5/0481 , B62D6/00 , B62D6/002 , B62D6/02 , H02P21/00 , H02P21/22
Abstract: [Problem]An object of the present invention is to provide a control method and a control unit of an electric power steering apparatus that simplifies a calculation of a transformation from a two-phase command value to a three-phase command value performed in the case of driving and controlling a motor mounted on the electric power steering apparatus, reduces a load of the calculation, and enables installation to a microcomputer.[Means for solving the problem]A control method comprises a transformation step of transforming a two-phase command value calculated from the current command value into a three-phase command value; the transformation step separates a region for a vector consisting of the two-phase command value into six sectors, and transforms the two-phase command value into the three-phase command value in accordance with a calculation method that is predefined in each sector and is simplified; and the electric power steering apparatus drives the motor in accordance with the three-phase command value.
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公开(公告)号：US20180170421A1
公开(公告)日：2018-06-21
申请号：US15897928
申请日：2018-02-15
Applicant: NSK LTD.
Inventor： Ryo MINAKI , Takayoshi SUGAWARA , Hideki SAWADA
CPC classification number: B62D5/0463 , B62D1/286 , B62D5/04 , B62D15/02 , B62D15/021 , B62D15/0285
Abstract: An electric power steering apparatus including a torque sensor to detect a steering torque and a motor control unit to control a motor that applies an assist torque to a steering system of a vehicle, including a function to switch a control system of the motor between a torque control system to control a motor output torque and a position/speed control system to control a steering angle of a steering in accordance with a predetermined switching trigger, such that a fade processing switches from the torque control system to the position/speed control system or vice versa.
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30.发明申请公开(公告)号：US20180009472A1
公开(公告)日：2018-01-11
申请号：US15545539
申请日：2016-02-02
Applicant: NSK LTD.
Inventor： Hideki SAWADA , Takayoshi SUGAWARA , Ryo MINAKI
CPC classification number: B62D6/002 , B62D5/0409 , B62D5/0463 , B62D15/0215
Abstract: A steering holding judging apparatus for the vehicle including: at least two steering angle sensors to detect a steering angle; and a steering state judging section to calculate a hysteresis central value by using a hysteresis signal that sets a hysteresis width to the two steering angle sensor, judge a steering state using the hysteresis central value, and output provisional steering information, wherein a steering holding state is detected based on the provisional steering information, and the electric power steering apparatus equipped with the steering holding judging apparatus for the vehicle.
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