Robust control method of active suspension system based on time-varying displacement constraint

Abstract

The invention discloses a robust control method of an active suspension system based on time-varying displacement constraint and belongs to the field of automobile stability control technologies. According to the method, stress analysis is performed on a bodywork and tires under a suspension respectively according to the second law and the third law of Newton, a 1 / 4 automobile active suspension system mathematical model containing an actuator fault mathematical model is established, the nonlinear active suspension system is identified based on a radial basis function neural network, an actuator with a fault compensation function and a self-adaptive law of the actuator are designed, a barrier Lyapunov function is adopted to verify the stability of the closed-loop active suspension system, and finally parameters of the actuator and the self-adaptive law are adjusted to achieve the final control objective. Through the method, the thought of constraint control is considered in the design of the fault compensation actuator of the active suspension system, the performance of the actuator with a fault is obviously improved, and the safety of an automobile is guaranteed.

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...

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