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Control apparatus for electric-powered power steering apparatus

A technology of electric power steering and control device, applied in the direction of automatic steering control components, motor control, power steering mechanism, etc., can solve problems such as torque fluctuation, and achieve the effect of improving fluctuation accuracy

Active Publication Date: 2013-09-25
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In such an electric power steering apparatus, since the three-phase resistance values ​​(resistance (R) and inductance (L)) are different between the brushless DC motor 20 and the control device 30, as in image 3 As shown, the maximum amplitude values ​​of the currents ia, ib, and ic flowing in the three phases are not the same, and there is a problem that torque fluctuations occur

Method used

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  • Control apparatus for electric-powered power steering apparatus
  • Control apparatus for electric-powered power steering apparatus
  • Control apparatus for electric-powered power steering apparatus

Examples

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Embodiment Construction

[0053] In the scheme of reducing the torque fluctuation of the motor due to the inconsistency of each phase characteristic (Lx, Rx) between the brushless DC motor and the control unit (ECU), the present invention provides a method that can reduce or eliminate the torque fluctuation, and can simultaneously A control device that converts the characteristics of each phase into desired characteristics (Lh, Rh) and can change the transient response (dynamic characteristics) of the motor arbitrarily. By converting the characteristics of each phase of the motor and the control device into the desired characteristics (Lh, Rh) and making them consistent, the accuracy of fluctuations in torque, speed, etc. can be improved, and there is no abnormal noise in the electric power steering device, and there is no abnormality during steering feel.

[0054] Next, embodiments of the present invention will be described in detail.

[0055] First, the motor characteristics will be described. Assu...

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Abstract

To provide a control apparatus for an electric-powered power steering apparatus, wherein ripple precision in torque, speed, and other properties is improved, abnormal noise is not made, and strangeness is not felt upon steering, by making the properties of each of the phases of a motor and the control apparatus cancel each other, and converting the properties to desired properties. A control apparatus for an electric-powered power steering apparatus calculates a steering-torque assistance command value on the basis of steering torque to be generated at a steering wheel and vehicle speed, calculates current command values for each of the phases from the steering torque assisting command value, and controls a motor for applying steering assistance force to a steering mechanism, on the basis of current control values calculated from the current command values for each of the phases and current values of each of the phases. In this control apparatus for an electric-powered power steering apparatus, filters having a characteristic of making the properties of each of the phases of the motor and the control apparatus cancel each other are arranged at each of the paths, to make the properties of each of the phases of the motor and the control apparatus conform to each other, and to make the properties of each of the phases of the motor and the control apparatus become desired values.

Description

technical field [0001] The present invention relates to a control device for an electric power steering device that applies steering assist force generated by a brushless DC motor to a steering mechanism of a vehicle, and in particular to improving torque and speed by converting the characteristics of each phase of the motor and the control device into desired characteristics The control device of the electric power steering device that does not generate abnormal noise and has no strange feeling when steering. Background technique [0002] The electric power steering device that uses the rotational force of the motor to apply an auxiliary load to the steering device of the vehicle applies the driving force of the motor to the steering shaft or the rack shaft through a transmission mechanism such as a gear or a belt through a reducer. In order to accurately generate assist torque (steering assist torque), a control device of a conventional electric power steering device perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00B62D5/04B62D6/00H02P6/10H02P27/04H02P6/06H02P6/08H02P6/17H02P6/28H02P21/05H02P21/22H02P23/04H02P23/16H02P27/08
CPCB62D5/046H02P21/05H02P21/22H02P29/50H02P6/10
Inventor 星让中村文俊
Owner NSK LTD
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