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A return control method and device for an electric power steering device

An electric power steering and positive control technology, applied in the direction of electric steering mechanism, etc., can solve the problems of reducing steering wheel alignment performance, alignment overshoot, insufficient steering wheel alignment, etc., to improve alignment performance, improve alignment, The effect of improving the return to positive performance

Active Publication Date: 2022-05-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When a vehicle equipped with an electric power steering device is turned, the friction force increases due to the existence of the power-assisted motor and the worm gear reducer, which reduces the steering wheel's return to alignment performance, which may easily cause insufficient alignment of the steering wheel at low speeds and high-speed driving. return overshoot

Method used

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  • A return control method and device for an electric power steering device
  • A return control method and device for an electric power steering device
  • A return control method and device for an electric power steering device

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Embodiment Construction

[0063] In order to make the objectives, technical solutions and advantages of the present invention clearer and clearer, the present invention will be further described in detail with reference to the accompanying drawings and examples.

[0064] like figure 1 Said, a return-to-alignment control device of an electric power steering device of an automobile, comprising:

[0065] The road load estimation module is used to calculate the road resistance torque T when the car turns l and the actual steering work W provided by the electric power steering s ;

[0066] The driver's intention recognition module detects the turning angle and steering torque on the steering column, and identifies the driver's intention according to the turning angle and steering torque on the steering column, and judges whether to enter the return control;

[0067] The correction coefficient determination module is used to determine the vehicle speed correlation coefficient C of the return control accor...

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Abstract

The invention discloses a return control method and device of an electric power steering device. The method includes the steps of: establishing a mathematical model of the electric power steering device; testing the steering work under different road surface resistances through bench experiments, and making the results into a table Stored in the electronic control unit; determine the conditions for entering the centering control; estimate the road surface resistance moment of the car; according to the road surface resistance moment, calculate the energy that the booster motor needs to provide when the steering wheel of the car is returned to the centering, and calculate the power from this The motor needs to provide the auxiliary backing torque; finally, according to the vehicle speed information and the backing torque information, the vehicle speed correlation coefficient and the steering wheel correlation coefficient are obtained to correct the auxiliary backing torque. The present invention improves the return performance of the electric power steering device without affecting the driver's manipulation feel and without increasing the number of required sensors.

Description

technical field [0001] The present invention designs the technical field of electric power steering systems, and in particular relates to a method and a device for returning positive control of an electric power steering system for vehicles. Background technique [0002] The electric power steering system (EPS) of a vehicle is usually composed of a torque sensor, a vehicle speed sensor, an electronic control unit (ECU), a booster motor, a worm gear reducer, and a rack and pinion steering gear. The working principle of the electric power steering system is to detect the steering wheel angle and the steering torque acting on the steering wheel through the angle sensor and torque sensor installed on the steering column. The control algorithm generates the corresponding assist torque to assist the driver in turning the steering wheel. [0003] When a vehicle equipped with an electric power steering device is turned, the presence of the booster motor and the worm gear reducer in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62D5/04
Inventor 上官文斌严汶均
Owner SOUTH CHINA UNIV OF TECH
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