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21.发明申请公开(公告)号：US20180257704A1
公开(公告)日：2018-09-13
申请号：US15760745
申请日：2016-09-16
Applicant: NSK LTD.
Inventor： Ryo MINAKI , Hideki SAWADA , Takayoshi SUGAWARA
CPC classification number: B62D6/10 , B62D5/0409 , B62D5/0463 , B62D5/0484 , B62D5/049 , B62D15/0215 , B62D15/0235 , G01B21/22 , G06N99/005
Abstract: A vehicle steering angle detecting apparatus that connects a motor, which assist-controls a steering system of a vehicle, to the steering shaft via a reduction mechanism, and includes the first angle sensor which detects the steering shaft angle of the steering shaft and the second angle sensor which detects the motor shaft angle of the motor, including: a function that updates a static characteristic map and a dynamic characteristic map by iteratively learning a static characteristic and a dynamic characteristic of the nonlinear elements including the reduction mechanism, and mutually estimates the steering shaft angle and the motor shaft angle by using the static characteristic map and the dynamic characteristic map. The present invention is also the electric power steering apparatus equipped with the vehicle steering angle detecting apparatus.
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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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