公开(公告)号：US20170349208A1

公开(公告)日：2017-12-07

申请号：US15536411

申请日：2015-12-21

Applicant: NSK LTD.

Inventor： Takayoshi SUGAWARA ,  Yousuke IMAMURA ,  Masahiro MAEDA

IPC: B62D6/00 ,  B62D5/04

Abstract: An electric power steering apparatus includes: a current command value determining section that determines a current command value based on steering torque and vehicle speed; a vibration extracting filter that extracts a first vibration component having a predetermined amplitude and first predetermined frequency range depending on motor angular velocity; a vibration extracting section that extracts a second vibration component having a second predetermined frequency range depending on motor angular acceleration; a first compensation value calculating section that calculates a first vibration suppression compensation value based on the first vibration component extracted by the vibration extracting filter; and a second compensation value calculating section that calculates a second vibration suppression compensation value based on the second vibration component; and suppresses vibrations of the motor by feeding back the first vibration suppression compensation value and the second vibration suppression compensation value calculated to the current command value.

公开(公告)号：US20160304119A1

公开(公告)日：2016-10-20

申请号：US15100357

申请日：2015-02-23

Applicant: NSK LTD.

Inventor： Takayoshi SUGAWARA ,  Yousuke IMAMURA ,  Masahiro MAEDA

IPC: B62D5/04 ,  B62D5/00

CPC classification number: B62D5/0463 ,  B62D5/008 ,  H02P21/05 ,  H02P29/50

Abstract: An electric power steering device includes a torque detector including an input shaft rotational angle detector and an output shaft rotational angle detector configured to respectively detect rotational angles of an input shaft and an output shaft coupled by a torsion bar arranged in a steering system of a vehicle; an electric motor configured to be controlled based on a torque detection value detected by the torque detector, and to generate a steering assistance force to be exerted on the output shaft; a motor rotational angle detector configured to detect a motor rotational angle of the electric motor; and a noise suppression unit configured to reduce a noise in a signal of the rotational angle of the output shaft detected by the output shaft rotational angle detector, by using the motor rotational angle detected by the motor rotational angle detector.

Abstract translation: 一种电动助力转向装置，包括：转矩检测器，包括输入轴旋转角度检测器和输出轴旋转角度检测器，该输出轴旋转角度检测器被配置为分别检测输入轴和输出轴的旋转角度，所述输入轴和输出轴由布置在车辆的转向系统中的扭杆 ; 电动机，其被配置为基于由所述转矩检测器检测的转矩检测值来控制，并且产生将被施加在所述输出轴上的转向辅助力; 电动机旋转角度检测器，被配置为检测电动机的电动机旋转角度; 以及噪声抑制单元，其被配置为通过使用由马达旋转角度检测器检测到的马达旋转角度来减小由输出轴旋转角度检测器检测的输出轴的旋转角度的信号中的噪声。

公开(公告)号：US20160072421A1

公开(公告)日：2016-03-10

申请号：US14240656

申请日：2013-10-11

Applicant: NSK LTD.

Inventor： Takayoshi SUGAWARA

IPC: H02P21/00 ,  H02P6/00 ,  H02P23/14

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.

Abstract translation: 一种多相电机控制装置，其通过使用一分路型电流检测电路和电力实现CPU的处理能力的降低，通过在时间上更精细地设定移动量来减少振动和噪声的发生 转向装置使用它。 该装置包括：PWM信号生成部，其基于当前估计值和载波信号，在两个控制周期内生成多个第二各相PWM信号，并且在刚刚的预定相位的相移量的情况下 在控制周期为零并且当前控制周期中的预定相位的相移量不为零之后，相移控制部分在当前控制周期和下一个控制周期内从零开始逐渐增加相位偏移量，并且使用 在下一个控制周期内的第二个每相PWM信号。