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Electric power steering device

A technology of electric power steering and electric motor, which is applied in the direction of electric steering mechanism, power steering mechanism, automatic steering control components, etc. It can solve the problems of driver's incoordination and achieve the effect of improving steering feeling and reducing vibration

Active Publication Date: 2017-08-01
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In such an electric power steering device, when the steering wheel is held still or when turning at a low speed, a slight vibration is sometimes generated, thereby giving the driver a sense of incongruity

Method used

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Examples

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Embodiment Construction

[0040] In the electric power steering device of the present invention, in order to reduce noise caused by low-speed steering through the stability compensation unit based on the angular velocity of the motor and the angular acceleration of the motor or the stability compensation unit based on the angular velocity of the motor, the angular acceleration of the motor, and the vehicle speed Incongruity, and smooth steering without phase lag at high-speed steering, the electric power steering device of the present invention can change the filter for filtering the motor angular acceleration according to the motor angular velocity or according to the motor angular velocity and the vehicle speed The unit's cutoff frequency. That is to say, in the present invention, by setting a low cutoff frequency when the steering wheel is held still and low-speed steering, and setting the cutoff frequency to be high when high-speed steering is used, small vibrations are small and the steering is smo...

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Abstract

[Problem] To provide an electric power steering device capable of reducing a sense of discomfort due to noise when steering or when executing low-speed steering, and capable of achieving smooth steering without phase delay during high-speed steering. [Solution] An electric power steering device includes a torque control unit that computes a current command value on the basis of at least a steering torque, and assist-controls a steering system by driving a motor using a current control system based on the current command value. The electric power steering device is provided with: a motor angular velocity computing unit that computes a motor angular velocity from a motor rotation angle; a motor angular acceleration computing unit that computes a motor angular acceleration from the motor angular velocity; and a stability compensation unit that computes a compensation steering torque and a compensation current command value on the basis of the motor angular velocity and the motor angular acceleration (and additionally the vehicle speed as necessary), wherein the steering torque is compensated using the compensation steering torque and the current command value is compensated using the compensation current command value.

Description

technical field [0001] The present invention relates to an electric power steering device for applying steering assist force generated by an electric motor to a steering system of a vehicle, and more particularly to a high-performance electric power steering device for reducing incongruity caused by noise during low-speed steering and achieve smooth steering without phase lag at high-speed steering, by changing the cutoff frequency of the filter unit based on the motor angular velocity or based on the motor angular velocity and the vehicle speed, micro vibrations are reduced and steering feel is also improved. Background technique [0002] Electric Power Steering (EPS) uses the rotational force of an electric motor to apply steering assist force (assist force) to the steering system of the vehicle, which uses the driving force of the motor as the steering assist force through a transmission mechanism such as a gear or a transmission belt via a reduction gear Applied to steer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D6/00B62D113/00B62D119/00
CPCB62D5/046B62D5/0463H02P6/17B62D5/04B62D5/0472B62D6/008B62D6/10
Inventor 吉田圭太今村洋介前田将宏
Owner NSK LTD
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