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Electric power steering device

一种电动助力转向、转向盘的技术，应用在电动转向机构、动力转向机构、自动转向控制部件等方向，能够解决大撞击、驾驶员不舒服、撞击噪音等问题，达到抑制撞击、提高控制性、易于预测常数设计的效果

Active Publication Date: 2017-08-29
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In such an electric power steering device, when a large assist torque is applied by the electric motor near the maximum steering angle (rack end) of the steering system, a large torque will be generated when the steering system reaches the maximum steering angle. Hit and produce bump noise (abnormal sound), so it may make the driver feel uncomfortable

Method used

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Examples

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Embodiment Construction

[0060] The present invention is an electric power steering device, which constitutes a control system based on a physical model near the end of a rack, sets a viscoelastic model (spring constant, viscous friction coefficient) as a standard model, and constitutes model following control so that the control object The output (distance to the end of the rack) follows this standard model, so that the driver does not feel uncomfortable in steering, suppresses the occurrence of abnormal noise during end collisions, and suppresses rack end collisions (including rack end collisions). attenuation of impact force).

[0061] The model following control is constituted by the viscoelastic model following control unit, and the viscoelastic model following control unit is constituted by the feedforward control unit, the feedback control unit or both, and the usual assistance is performed outside the range of the specified angle in front of the rack end For the control, the model following co...

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Abstract

[Problem] To provide an electric power steering device that: constitutes a control system on the basis of a physical model; constitutes model-following control whereby output (distance to a rack end) of a control target follows a reference model; suppresses the occurrence of noise at end contact, without providing any unusual steering sensation to the driver; and suppresses end contact. [Solution] An electric power steering device that performs assist control of a steering system by calculating a current command value on the basis of at least steering torque and driving a motor on the basis of the current command value, said electric power steering device: constituting model-following control having a viscoelastic model as a reference model within a prescribed angle range just before the rack end; and suppressing rack end end contact.

Description

technical field [0001] The present invention relates to an electric power steering apparatus that calculates a current command value based on at least a steering torque, and drives a motor by the current command value to apply assist torque to a steering system of a vehicle. In particular, the present invention relates to an electric power steering apparatus in which the viscoelastic model is set as a normative model, and by limiting the current command value (current command value を twist る) near the end of the rack so as to reduce the assist torque and make the end collide Momentum attenuation and reduced impact energy, thereby suppressing the impact noise (abnormal sound) that makes the driver uncomfortable and improving steering feel. Also, the present invention relates to a high-performance electric power steering device, which changes the model parameters and The control parameters of the control system (feedback control unit) can respond to all road surface conditions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D6/00B62D5/04B62D101/00B62D119/00
CPCB62D5/0469B62D6/00B62D1/166B62D5/0463G05B13/04
Inventor 坂口徹丸山翔也
Owner NSK LTD
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