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A Robust Control Method for Active Suspension Systems with Time-varying Displacement Constraints

A technology of active suspension and robust control, applied in the directions of adaptive control, general control system, control/regulation system, etc., can solve problems such as less attention to the fault-tolerant control of the suspension system, and achieve improved approximation ability, performance improvement, Improved handling stability

Active Publication Date: 2022-03-29
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, these studies pay little attention to the problem of fault-tolerant control of the suspension system, especially the safety of its suspension system

Method used

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  • A Robust Control Method for Active Suspension Systems with Time-varying Displacement Constraints
  • A Robust Control Method for Active Suspension Systems with Time-varying Displacement Constraints
  • A Robust Control Method for Active Suspension Systems with Time-varying Displacement Constraints

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Embodiment Construction

[0089] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0090] like figure 1 As shown, the method of this embodiment is as follows.

[0091] Step 1: Establish a mathematical model of the actuator failure of the active suspension system:

[0092]

[0093] where u is the actuator output signal in the active suspension system, u c is the actuator input signal, T f is the fault occurrence time, ρ is the failure factor, θ represents the deviation from the fault, and there is a constant ρ and so that the following inequalities hold:

[0094]

[0095] When the actuator deviates from the fault, ρ=0, θ≠0, at this time u c No longer works, deviates to the fault value θ;

[0096] When the actuator fails, ρ∈(0,1), θ=0, at t...

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Abstract

The invention discloses a robust control method for an active suspension system with time-varying displacement constraints, and belongs to the technical field of automobile stability control. According to Newton's second law and third law, the present invention respectively analyzes the force of the vehicle body and the tires under the suspension, establishes a mathematical model of 1 / 4 automobile active suspension system containing a mathematical model of actuator failure, and uses the radial basis neural network to Identify the nonlinear active suspension system, design the actuator with fault compensation and its adaptive law, and use the barrier Lyapunov function to verify the stability of the closed-loop active suspension system, and finally adjust the parameters of the actuator and the adaptive law, achieve the ultimate control goal. The invention takes the concept of constraint control into consideration in the design of the fault compensation actuator of the active suspension system, not only obviously improving the performance of the actuator when it fails, but also ensuring the safety of the vehicle.

Description

technical field [0001] The invention relates to the technical field of automobile stability control, in particular to a robust control method for an active suspension system with time-varying displacement constraints. Background technique [0002] With the improvement of living standards and the continuous development of science and technology, active suspension systems play an important role in automobiles. The automotive suspension system integrates electronic systems, sensing systems, signal systems, power systems and other important components. When the car encounters different road condition information during driving, the car can use the active suspension system to make real-time adjustments to ensure the overall safety of the car and improve the ride comfort of passengers. [0003] During the actual operation of the automobile suspension system, problems such as sensor failure, transmission signal error and equipment aging may occur, and these problems may cause dama...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 刘艳军曾强刘磊李大鹏
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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