Electric power steering system

A technology of electric power steering and auxiliary devices, which is applied to electric steering mechanisms, power steering mechanisms, automatic steering control components, etc., and can solve problems such as different frequencies

Inactive Publication Date: 2011-01-19
JTEKT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the frequency band to be targeted by this phase compensation control is different from the frequency of the fluctuation component contained in the above-mentioned steering torque.

Method used

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Examples

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Embodiment Construction

[0033] Hereinafter, a first embodiment embodying the present invention will be described with reference to the drawings.

[0034] 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, and the steering shaft 3 rotates along with the steering operation. The reciprocating linear motion of the rack shaft 5 is transformed by the rack and pinion mechanism 4 . The steering shaft 3 is formed by connecting a steering column shaft 8 , an intermediate shaft 9 and a pinion shaft 10 . 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 tie rods 11 connected to both ends of the rack shaft 5 , thereby changing the rudder angle of the steering wheels 12 . , that is, the direction of travel of the vehicle.

[0035] The EPS 1 i...

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PUM

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Abstract

The invention provides an electric power steering system. A motor control signal output unit of an electric power steering system includes a feedback gain calculation unit (52), and a feedback control unit executes a feedback control with the use of a proportional gain (Kp) and an integral gain (Ki) that are calculated by the feedback gain calculation unit (52). The feedback gain calculation unit (52) sets the feedback gains to large values (Kp=P0, Ki=I0) when the absolute value of an assist gradient ([alpha]) is equal to or smaller than a predetermined value ([alpha]0) (|[alpha]|<=[alpha]0). On the other hand, when the absolute value of the assist gradient ([alpha]) exceeds the predetermined value (A) (|[alpha]|>[alpha]0), the feedback gain calculation unit (52) sets the feedback gains to small values (Kp=p1, Ki=I1:P1<P0, I1<I0).

Description

technical field [0001] The present invention relates to electric power steering devices. Background technique [0002] This application claims the right of priority of Japanese Patent Application No. 2009-162055 filed on July 8, 2009, and the entire contents of the specification, drawings and abstract of the Japanese Patent Application are cited in this application. [0003] Among power steering devices for vehicles, there is an electric power steering device (EPS) that uses a motor as a drive source. Usually, in this EPS, the control device detects a steering torque transmitted through a steering shaft, and calculates a target assist force to be given to a steering system based on the steering torque. Also, by performing feedback control so that the actual current value follows the current command value corresponding to the target assist, the operation of the actuator is controlled by supplying drive power to the motor. [0004] However, in this EPS, improvement of quietn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/04B62D6/08
CPCB62D5/0463
Inventor 铃木浩山野尚纪玉泉晴天南部彰
Owner JTEKT CORP
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