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Multi-mode switching control method of electric power steering system

A technology of electric power steering and control method, applied in electric steering mechanism, power steering mechanism, steering mechanism, etc., can solve problems such as poor stability, steering wheel jitter, and sudden change of motor current.

Inactive Publication Date: 2017-06-13
HEFEI UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

The stability of the hybrid system is poor during the switching process. If the control performance is not good, the various modes of the EPS will produce sudden changes in the motor current and steering wheel vibration during the switching process, which will seriously affect the performance of the EPS.

Method used

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  • Multi-mode switching control method of electric power steering system
  • Multi-mode switching control method of electric power steering system
  • Multi-mode switching control method of electric power steering system

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Embodiment Construction

[0122] refer to figure 1 , Figure 3-Figure 7 , figure 1 , Figure 3-Figure 7 The electric power steering system multi-mode switching control method proposed for the present invention includes the following steps:

[0123] S1. Obtain vehicle steering wheel torque, steering wheel angle, and vehicle speed information, and select a control mode according to the vehicle steering wheel torque, steering wheel angle, and vehicle speed information;

[0124] Step S1 specifically includes: acquiring the steering wheel torque T of the vehicle through a sensor h , Steering wheel angle θ c , vehicle speed V information;

[0125] when Or V≥70km / h&&|T h When |>2N·m, select the assist mode;

[0126] when , select the back-to-center mode;

[0127] When V≥70km / h&&|T h When |≤2N·m, select the damping mode.

[0128] S2. Establish fuzzy rules based on the fuzzy control theory, and design a fuzzy switching controller according to the above fuzzy rules, and calculate the output current...

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Abstract

The invention discloses a multi-mode switching control method and system of an electric power steering system. The method comprises the following steps that (S1), a vehicle steering wheel torque and rotary angle and vehicle speed information are obtained, and a control mode is selected; (S2), a fuzzy switching controller is designed, and the output current is worked out according to the target current and the weight coefficient; (S3), the differential and the second-order differential of the output current are calculated, an extension set relevant to the feature state is built, and regional division is conducted; and (S4), the fuzzy switching controller is subjected to functional improvement on the basis of an extension theory, different control methods are set in different regions of the extension set, the correlation function is built, the condition that the output current locates in which region of the extension set is judged, and the optimized electricity quantity is input into a motor. According to the multi-mode switching control method and system of the electric power steering system, the target current is optimized according to different adopted control strategies at different current set states, so that the better control property is obtained, and EPS multi-mode smooth switching is achieved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle steering system control, in particular to a multi-mode switching control method and system for an electric power steering system. Background technique [0002] Compared with the traditional hydraulic power steering system, the electric power steering system has the characteristics of small size, high efficiency and low consumption, and can improve handling stability. It has been widely used in automobiles. [0003] According to different working conditions, EPS control modes are generally divided into boost control mode, return control mode, and damping control mode. EPS adopts corresponding control modes to control the steering system of the car according to the current working conditions of the car, which not only reduces the burden on the driver, but also improves the steering stability of the car. In a certain driving condition of the car, EPS is in a control mode, which is a continu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/04
CPCB62D5/046B62D5/0463B62D5/0466B62D5/0472
Inventor 汪洪波夏志
Owner HEFEI UNIV OF TECH
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