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Motor control unit and electric power steering system

By performing torque feedback control based on torque deviation in the motor control device and changing the gain according to the addition angle pattern, the stability and responsiveness problems in rotary transformer-less control are solved, and high quietness and quick recovery are achieved.

Inactive Publication Date: 2013-03-06
JTEKT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the above-mentioned conventional example, although the gain of the torque feedback control is made variable based on the final calculated addition angle (absolute value), it does not consider whether to perform correction of the addition angle based on the estimated motor rotation angle.
Therefore, depending on whether the correction is performed, the responsiveness tends to be excessive or insufficient, and the stability of the motor control may decrease.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0020] like figure 1 As shown, in the electric power steering system (EPS) 1 of this embodiment, the steering shaft 3 to which the steering wheel 2 is fixed is connected to the rack shaft 5 via the rack and pinion mechanism 4 . Also, the rotation of the steering shaft 3 accompanying the steering operation is converted into a reciprocating linear motion of the rack shaft 5 by the rack and pinion mechanism 4 . Furthermore, the steering shaft 3 of this embodiment is formed by connecting a column shaft 3a, an intermediate shaft 3b, and a pinion shaft 3c. Then, the reciprocating linear motion of the rack shaft 5 accompanying the rotation of the steering shaft 3 is transmitted to a steering knuckle (not shown) via the tie rods 6 connected to both ends of the rack shaft 5 , thereby changing the steering of the steering wheels 7 . Angle, which is the direction of travel of th...

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PUM

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Abstract

The invention refers to a motor control unit and an electric power steering system, wherein an F / B gain control unit (47) computes a first change component (delta tau) by executing torque feedback control based on a torque deviation ( T) using a feedback gain that is computed by a F / B gain variable control unit (80). The F / B gain variable control unit (80) computes one of two different feedback gains (K1, K2) that correspond to a ''first computation mode'' in which the first change component (d tau) is used as an addition angle (theta a) and a ''second computation mode'' in which a value obtained by correcting the first change component (d theta tau) by an estimated motor rotation angular velocity (omega m_e) is used as the addition angle ( theta a), respectively. A feedback gain (K1) used in the first computation mode is set such that a response at the feedback gain (K1) is higher than that at a feedback gain (K2) used in the second computation mode.

Description

technical field [0001] The present invention relates to a motor control device and an electric power steering device. Background technique [0002] Conventionally, there is a vehicle steering system such as an electric power steering system (EPS), which includes a motor control device capable of controlling a brushless motor without detecting the rotation angle of the motor. Furthermore, as a method of sensorless (resolver-less) drive control that does not use such a rotation angle sensor (motor resolver), it is proposed to calculate an added angle corresponding to the amount of change in the motor rotation angle per calculation cycle. A method of performing current feedback control in a rotating coordinate system in accordance with the motor rotation angle (control angle) obtained by accumulating the added angle. [0003] For example, the motor control device described in US2010 / 0235051 performs based on a torque deviation (deviation between the target steering torque and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/13B62D5/04B62D6/00B62D119/00H02P6/06H02P6/08H02P6/17H02P6/28H02P21/00H02P21/05H02P21/14H02P21/18H02P21/22H02P21/24H02P23/04H02P23/12H02P23/14H02P27/06H02P27/08
CPCH02P6/00H02P6/08
Owner JTEKT CORP
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