Vehicle steering device

A technology for steering devices and vehicles, which is applied to steering mechanisms, steering rods, vehicle components, etc. It can solve the problems of output characteristics, such as the influence and change of steering torque, and achieve the effect of improving followability

Active Publication Date: 2020-07-10
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of control by this method, "steering torque sometimes changes depending on the steering angle" due to different road surface conditions (for example, different road surface inclinations)
In addition, changes in the output characteristics of the motor "due to years of use" may also affect the steering torque

Method used

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Examples

Experimental program
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Embodiment Construction

[0045] The present invention is a steering device for a vehicle "for realizing equivalent steering torque with respect to vehicle driving information such as steering angle, vehicle speed, and steering state without being affected by road surface conditions." The vehicle steering device of the present invention realizes a desired steering torque by controlling the torsion angle of the torsion bar and the like to follow a value "corresponding to vehicle driving information".

[0046] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0047] First, an example of installation of various sensors "for detecting information related to an electric power steering device which is one of the vehicle steering devices of the present invention" will be described. image 3 An example of the arrangement of an EPS steering system and various sensors is shown, and a torsion bar 2A is mounted on a column shaft 2 . like image 3 As shown, the ...

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PUM

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Abstract

To provide a vehicle steering device with which it is possible to easily achieve a steering torque equivalent with respect to vehicle operation information such as steering angle, without being affected by a road surface condition or by a change in mechanism characteristics of a steering control system due to aging. Provided is a vehicle steering device for controlling assistance of a steering system, the steering device being provided with a twist angle control unit which calculates a target twist angle in accordance with vehicle operation information and also calculates a motor electric current command value on the basis of the twist angle. The twist angle control unit is provided with: a twist angle feedback compensation unit which calculates a target twist angular velocity from a deviation between a target twist angle and a twist angle; a twist angular velocity calculation unit which calculates a twist angular velocity from a twist angle; a velocity control unit which calculates apre-limitation motor electric current command value by carrying out proportional compensation on the basis of the target twist angular velocity and the twist angular velocity; and an output control unit which outputs the motor electric current command value by setting an upper and a lower limit for the pre-limitation motor electric current command value, whereby drive control is performed on a motor, on the basis of the motor electric current command value.

Description

technical field [0001] The present invention relates to a high-performance vehicle steering device capable of realizing a desired steering torque by controlling the torsion angle of a torsion bar and the like following a value "corresponding to vehicle driving information", Also, it is neither affected by the state of the road surface nor affected by the secular variation of the characteristics of the mechanism system. Background technique [0002] Electric Power Steering (EPS) "as a steering device for vehicles" uses the rotational force of an electric motor to impart assist force (steering assist force) to the steering system of the vehicle, which will be controlled by the electric power supplied from the inverter. The driving force of the electric motor is applied to the steering shaft or the rack shaft as an auxiliary force through the transmission mechanism including the reduction mechanism. Such a conventional electric power steering apparatus performs feedback contro...

Claims

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Application Information

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IPC IPC(8): B62D6/00B62D5/04B62D101/00B62D113/00B62D117/00B62D119/00
CPCB62D5/0463B62D5/0481B62D6/008B62D5/0472B62D5/0493B62D6/02
Inventor 椿贵弘今村洋介
Owner NSK LTD
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