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Electric power steering device

一种电动助力转向、转向扭矩的技术，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，能够解决撞击噪音、大撞击、驾驶员不舒服等问题，达到减少电流、抑制不协调感、易于预测常数设计的效果

Active Publication Date: 2017-09-26
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

[0075] 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 normative model, and constitutes a model following control so that the control object's The output (the distance to the end of the rack) follows this standard model, and the driver does not feel uncomfortable in steering, suppresses the occurrence of abnormal noise when the end collides, and attenuates the impact force.

[0076] The model following control is configured by the viscoelastic model following control unit, the viscoelastic model following control unit is configured by the feedback control unit or the feedforward control unit and the feedback control unit, and the normal operation is performed outside the range of the predetermined angle in front of the rack end. The auxiliary control is to perform model following control within the range ...

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Abstract

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; suppresses impact force; prevents motor overheating; and enables safety measures to be implemented for model-following control. An electric power steering device that performs assist control of a steering system by calculating a current command value 1 on the basis of at least steering torque and driving a motor on the basis of the current command value 1, 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; applying an offset to inputs or outputs to / from a viscoelastic model in order to prevent overheating; and suppressing rack end contact.

Description

technical field [0001] The present invention relates to an electric power steering device that calculates a current command value based on at least steering torque, and drives an electric motor by the current command value to apply an assist force to a steering system of a vehicle. In particular, the present invention relates to an electric power steering apparatus which uses a viscoelastic model as a normative model, and limits the current command value (current command value) near the end of the rack in order to reduce the assist torque and cause the end to collide. Attenuating momentum and reducing impact energy, it suppresses driver-uncomfortable impact noise (abnormal sound) and improves steering feel. Background technique [0002] Electric Power Steering (EPS) applies an assist force to the steering system of a vehicle using the rotational force of an electric motor, which applies the driving force of the electric motor to a steering shaft or a rack shaft via a speed r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D6/00B62D5/04B62D101/00B62D119/00
CPCB62D5/0469B62D5/0463B62D6/00B62D3/12B62D5/0424B62D5/0487
Inventor 坂口徹尾上利和
Owner NSK LTD
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