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Electric power steering device

A technology of electric power steering and electric motor, which is applied in the direction of electric steering mechanism, power steering mechanism, automatic steering control parts, etc. It can solve the problems of small friction compensation and heavy steering of steering handle, and achieve high steering feeling and high stability Effect

Active Publication Date: 2011-06-22
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the electric power steering device described in Patent Document 1, there is a problem that the compensation of friction becomes too large near the center of the steering handle where the steering assist force becomes small, and the steering of the steering handle becomes too light. When the steering handle with a larger steering assist force increases the steering, the friction compensation becomes smaller, and the steering handle becomes heavier

Method used

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Examples

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Embodiment Construction

[0079] Because the friction of the deceleration mechanism of the electric power steering device is large, in order to prevent the deterioration of the steering feel based on this friction, friction (static friction, dynamic friction) compensation is required. The electric power steering device of the present invention calculates the friction compensation value based on the steering torque, and uses the friction compensation value to correct the current command value used to control the motor to perform friction compensation. At the same time, it can smoothly perform static friction compensation and dynamic friction compensation without a sense of strangeness. The switch can get a more natural and comfortable steering feel.

[0080] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0081] image 3 correspond figure 2 , Is a block diagram showing a configuration example of the electric power steering control unit 100 of the present...

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Abstract

Provided is an electric power steering device that compensates for both the static friction and dynamic friction of the electric power steering device, and that switches smoothly between compensation for the static friction and compensation for the dynamic friction without causing any uncomfortable sensation in order to achieve a natural, comfortable steering feel. In an electric power steering device in which a current instruction value is computed based at least on steering torque, and a motor which applies a steering assist force to a steering mechanism is controlled according to a currentcontrol value computed based on the current instruction value, a friction compensation unit is provided to compute a friction compensation value to provide friction compensation for the steering mechanism based on the steering torque, and the current instruction value is corrected using the friction compensation value.

Description

Technical field [0001] The present invention relates to an electric power steering device that applies a steering assist force to a steering mechanism of a vehicle through an electric motor, and particularly relates to an electric power steering device that implements friction compensation for the steering mechanism based on steering torque. Background technique [0002] The electric power steering device uses the rotational force of the electric motor to apply an auxiliary load to the steering device of the vehicle. The driving force of the electric motor is transmitted through a gear or belt through a transmission mechanism such as a reducer to apply an auxiliary load to the steering shaft or rack shaft. In order to accurately generate assist torque (steering assist force), the existing electric power steering device performs feedback control of the motor current. The feedback control adjusts the motor applied voltage to reduce the difference between the current command value a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D6/00B62D5/04B62D101/00B62D119/00B62D137/00
CPCB62D5/0463B62D5/0466
Inventor 菅原孝义前田将宏韦勇
Owner NSK LTD
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