Self-adaptive control method for automobile active suspension

Abstract

The invention discloses a self-adaptive control method for an automobile active suspension, and belongs to the technical field of automobile engineering. The invention discloses a self-adaptive control method for an automobile active suspension. The self-adaptive control method comprises the following steps: S1, designing a nonlinear dynamic model of a system; S2, designing an unknown time-varying function to represent an uncertain part of the system; S3, designing a Fourier series-based function approximation method to estimate an unknown time-varying system function; and S4, designing a self-adaptive sliding mode control system. According to the method, the uncertain part of the system is estimated on line, the control force is calculated on line through the self-adaptive sliding mode controller, the influence of load and system parameter time varying can be better overcome, and compared with traditional PID control, the vibration reduction control performance of the system is greatly improved.

Description

technical field [0001] The invention relates to the technical field of vehicle engineering, in particular to an adaptive control method for an active suspension of an automobile. Background technique [0002] The suspension system in the vehicle structure is an important part that affects the driving performance and ride comfort. Poor suspension system design not only makes the occupants feel uncomfortable, but also may cause the tires to separate from the ground instantly, which will affect driving safety. The traditional passive suspension system only uses components such as springs and dampers to store and dissipate energy. There are certain design characteristics restrictions on dynamic response, so it cannot have elastic changes to cope with the disturbance of the car body due to road bumps. Therefore, The choice of elastic coefficient and damping coefficient is particularly important. Since there is no external control force to suppress the disturbance of the car body...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems in the prior art that the accurate model of the automobile suspension system is difficult to obtain, the load and parameters of the suspension vibration isolation system are time-varying and the road surface information is unpredictable, so that the adaptive control cannot be realized efficiently and accurately , and proposed an adaptive control method for automobile active suspension; by establishing the nonlinear model of the system, using the function approximation method to identify the uncertain part of the system online, the adaptive sliding mode control controller generates the control force online, in Better damping effect in active control of automobile suspension system

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