Sprung mass inertia load and electro-hydraulic active actuator are regarded as being rigidly connected, in vehicle suspension systems, and the flexible characteristic exists in these two components. The flexible hinge reduces the response speed, system stability and tracking accuracy in the electro-hydraulic actuator when subjected to external excitations. Therefore, a control strategy of sliding mode backstepping is proposed based on state observer, enhancing the dynamic performance of electro-hydraulic servo suspension systems with flexible hinge. The novel dynamic model is established, considering the sprung mass connection stiffness and load rigidity, based on the working principle and dynamic characteristics of the electro-hydraulic servo system of active suspension. The frequency characteristics of the system are analyzed under different sprung mass connection stiffness, revealing the laws of system bandwidth, stability, and resonance characteristics. A sliding mode backstepping control strategy is designed based on a state observer, considering the system frequency characteristics. Simulation and experimental results show that the strategy effectively reduces sprung mass displacement. The ride comfort and the dynamic performance are improved.
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