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Vehicle steering device

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

Inactive Publication Date: 2021-07-23
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of controlling by this method, depending on the state of the road surface (for example, slope), the steering torque may vary depending on the steering angle.
Variations in motor output characteristics over time may also affect steering torque

Method used

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  • Vehicle steering device
  • Vehicle steering device
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Experimental program
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Embodiment Construction

[0044] The present invention is a steering device for a vehicle for realizing equivalent steering torque to the steering angle and the like without being affected by the state of the road surface, and is controlled so that the torsion angle of the torsion bar and the like follows a value corresponding to the steering angle and the like , to achieve the desired steering torque.

[0045] Embodiments of the present invention will be described below with reference to the drawings.

[0046] First, installation examples 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 It is a diagram showing an installation example of an EPS steering system and various sensors, and the column shaft 2 includes a torsion bar 2A. The road surface reaction force Fr and road surface information μ act on the steered wheels 8L, 8R. An upper angle sensor is installed o...

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Abstract

To provide a vehicle steering device capable of easily achieving a steering torque equivalent to a steering angle, etc., without being affected by the condition of a road surface and without being affected by change in mechanism characteristics of a steering system over time. This vehicle steering device for assist-controlling a steering system is provided with a torsion angle control unit that calculates a motor current command value for causing a torsion angle to follow a target torsion angle, wherein the torsion angle control unit is provided with a steering angle disturbance compensation unit for performing a filtering process for a detected steering angle, and calculating a first compensation motor current command value, and the torsion angle control unit performs compensation in the calculation of the motor current command value on the basis of the first compensation motor current command value.

Description

technical field [0001] The present invention relates to a high-performance vehicle steering device that realizes a desired steering torque based on the torsion angle of a torsion bar and the like without being affected by the state of the road surface, and is not affected by changes in the characteristics of the mechanism system over time . Background technique [0002] Electric Power Steering (EPS), one of the steering devices for vehicles, applies an assist force (steering assist force) to the steering system of the vehicle with the rotational force of the motor, and transfers the electric power supplied from the inverter through the transmission mechanism including the speed reduction mechanism. The driving force of the controlled motor is given to the steering shaft or the rack shaft as an assist force. Such a conventional electric power steering apparatus performs feedback control of a motor current in order to accurately generate assist force. Feedback control adjust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D6/00B62D5/04B62D119/00
CPCB62D6/008B62D5/0409B62D5/0421B62D5/046B62D6/00
Inventor 椿贵弘熊谷浩保
Owner NSK LTD