Fuzzy Control Method for Vehicle Nonlinear Active Suspension System

A technology of active suspension and fuzzy control, which is applied in the direction of elastic suspension, suspension, vehicle components, etc., can solve the problems of large amount of calculation, etc., and achieve the effect of ensuring effectiveness, good driving comfort, and ensuring driving smoothness

Inactive Publication Date: 2016-08-31
GUANGXI UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

However, the scale factor and the quantization factor have mutual constraints, and the latter also faces the difficulty of a large amount of calculation

Method used

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  • Fuzzy Control Method for Vehicle Nonlinear Active Suspension System
  • Fuzzy Control Method for Vehicle Nonlinear Active Suspension System
  • Fuzzy Control Method for Vehicle Nonlinear Active Suspension System

Examples

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Embodiment 1

[0050] like figure 1 As shown, the steps of the fuzzy control method of the vehicle active suspension system in this embodiment are as follows:

[0051] A. Establish the active suspension system model, preset the state control expectation of the active suspension system, detect the suspension system state signal, calculate and obtain the control error signal according to the state control expectation, and define the fractional derivative of the control error signal;

[0052] Described step A includes the following steps:

[0053] Model the active suspension system:

[0054] The model of the active suspension system is

[0055] In the formula, m 1 and m 2 Represent 1 / 4 body mass and tire mass respectively, c is suspension damping coefficient, k 1 and k 2 are the suspension spring stiffness and tire stiffness, respectively, ε is the nonlinear coefficient of the spring, u represents the active control force, and x 1 , x 2 Represent body displacement and tire displacemen...

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Abstract

The invention aims to provide a fuzzy control method of an automobile nonlinear active suspension system. The method includes the following steps that A, an active suspension system model is established, the state control expectation of the active suspension system is preset, and fractional order differential of a control error signal is defined; B, a fuzzy controller is designed, the control error signal and the fractional order differential of the control error signal are adopted for the fuzzy controller to serve as input variables, and the suspension control force serves as controller output; C, road impact load simulation is conducted on the active suspension system model under the action of the fuzzy controller, and the order parameter of the fractional order differential of the control error signal is determined according to a comprehensive performance index function; D, the control error signal and the fractional order differential of the control error signal serve as the input variables of the fuzzy controller, the output control force of the fuzzy controller is obtained, and control over the actual active suspension system is finished. By means of the fuzzy control method, the problems that by means of an existing technical scheme, scale factors and quantifying factors restrain one another, and the calculated quantity is large are solved, and the fuzzy control method has the advantages of being accurate in control and efficient in calculation.

Description

technical field [0001] The invention relates to the field of vehicle suspension system control, in particular to a fuzzy control method for an automotive nonlinear active suspension system. Background technique [0002] Suspension system is one of the important components of automobiles. Automobile suspension system refers to the components that connect the elastic connection between the frame (or body) and the axle (or wheel), mainly composed of elastic elements, guide devices and shock absorbers. It is composed of three basic parts. The function of the car suspension is to moderate and suppress the vibration and impact caused by the uneven road surface, so as to ensure the comfort of the passengers and the integrity of the transported goods; in addition, in addition to transmitting the vertical force of the car, it also transmits other directions. force and torque, and ensure a definite motion relationship between the wheel and the body (or frame), so that the car has good...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60G17/018
Inventor 高远范健文王雨涛孔峰潘盛辉袁海英
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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