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Electric power steering apparatus

A technology of electric power steering and torque, which is applied in the direction of electric steering mechanism, power steering mechanism, automatic steering control components, etc., can solve the problem of different output values, and achieve the effect of improving control feeling and safety

Active Publication Date: 2013-04-03
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the output value of the torque sensor when the steering wheel is steered from left to right is different from the output value of the torque sensor when the steering wheel is steered from right to left (hysteresis: hysteresis)

Method used

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  • Electric power steering apparatus
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Examples

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Embodiment Construction

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0025] figure 1 It is a diagram showing a schematic configuration of an electric power steering device 100 according to the embodiment.

[0026] The electric power steering device 100 (hereinafter, sometimes simply referred to as "steering device 100") is a driving device for arbitrarily changing the traveling direction of a vehicle, and the present embodiment exemplifies a structure applied to an automobile.

[0027] The steering device 100 includes: a wheel-shaped steering wheel (steering wheel) 101 operated by a driver; and a steering shaft 102 integrally provided with the steering wheel 101 . Furthermore, the steering device 100 includes: an upper connecting shaft 103 connected to the steering shaft 102 via a universal joint 103a; and a lower connecting shaft 108 connected to the upper connecting shaft 103 via a universal joint 103b. The lower connecting...

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Abstract

The invention provides an electric power steering apparatus. As a research project, the invention provides a technology which can realize improved operation sense and improved security by controlling electric current amount of an electric motor considering delay. An electric power steering apparatus includes: a detector (210) that detects a value corresponding to a steering torque of a steering wheel (101); a correcting unit (220) that corrects a detection value detected by the detector (210) by taking into account a hysteresis between an actual steering torque and the detection value detected by the detector; and a target current calculating unit (20) that calculates a target current which is supplied to an electric motor (110) on the basis of a corrected detection value corrected by the correcting unit (220). The correcting unit (220) makes a correction by using a correction value corresponding to the detection value detected by the detector (210) so as to make the hysteresis small in a case where the steering torque is small and large in a case where the steering torque is large.

Description

technical field [0001] The invention relates to an electric power steering device. Background technique [0002] In recent years, electric power steering devices have been proposed that control the amount of current flowing into a motor based on the magnitude of steering force detected by a torque sensor. [0003] For example, the electric power steering device described in Patent Document 1 includes: an electric motor that supplies power to the steering mechanism to assist steering force; a torque sensor that detects the steering force; A control circuit that controls the amount of current flowing into the motor. And, the torque sensor is composed of the following parts: a torsion shaft connecting the input shaft and the output shaft on the same axis, a magnet installed at the end of the input shaft, a set of yokes installed at the end of the output shaft, and a set of yokes that detect the Magnetic sensors for magnetic flux density generated between yokes, etc. [0004]...

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 岩瀬雅祐
Owner HITACHI ASTEMO LTD
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