Abstract
In this paper, a new adaptive dynamic surface control strategy is proposed to deal with the uncertainty parameters of electro-hydraulic actuator and unknown external disturbances of vehicle active suspension system. A dynamic model of nonlinear vehicle active suspension is established. The adaptive parameter estimation laws are designed to estimate the uncertain parameters caused by the change of the physical characteristics of the electro-hydraulic actuator. In other words, the estimation of uncertain parameters in hydraulic system is beneficial to improve the control precision of vehicle. Nonlinear robust feedback signal is introduced to suppress unknown external disturbances. Then, this paper proposes an idea of dynamic surface in order to avoid explosion of complexity that caused by virtual control signal. The dynamic surface function replaces the derivative of virtual control signal in backstepping control, which reduces the computational complexity and improves the riding comfort. The simulation comparison shows that the presented method is effective in improving riding comfort and driving safety.
Highlights
The notations used in this paper are introduced as follows zs, zu z0 ms, mu Fk, Fc Ft, Fb Fu kt, bf k, ks PLVertical displacement of vehicle body and vertical displacement of the tire
1) An adaptive dynamic surface control is proposed for active suspension with electro-hydraulic actuator, which effectively improves the vehicle performance
2) As compared with [17], [22], the uncertain parameters are considered in the electro-hydraulic actuator, which is beneficial to the precise control of vehicle active suspension system and good for practical application in the future and the improvement of vehicle performance
Summary
The notations used in this paper are introduced as follows zs, zu z0 ms, mu Fk , Fc Ft , Fb Fu kt , bf k, ks PL. The authors in [22] established hydraulic active suspension and designed adaptive robust control method, which suppresses the vibration of the vehicle body. The authors in [23] designed a nonlinear backstepping control strategy for electro-hydraulic active suspension, which effectively stabilizes the force transmitted by the vertical motion of the vehicle to passengers. 1) An adaptive dynamic surface control is proposed for active suspension with electro-hydraulic actuator, which effectively improves the vehicle performance. 2) As compared with [17], [22], the uncertain parameters are considered in the electro-hydraulic actuator, which is beneficial to the precise control of vehicle active suspension system and good for practical application in the future and the improvement of vehicle performance.
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