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<p>In this article, an effective output-feedback adaptive fuzzy technique with disturbance rejection is conducted for a valve-controlled electro-hydraulic system (VCEHS), which is usually negatively impacted by lumped disturbances, dead-zone input, and internal leakage faults. First of all, the original nonlinear system is transformed into the canonical form. Additionally, adaptive fuzzy logic is applied to deal with unknown model dynamics. Next, an adaptive fuzzy extended state observer (AFESO) is used to cope with the lumped uncertainty (i.e., dead-zone input and internal leakage faults) in the VCEHS. Then, an ESO-based output-feedback adaptive fuzzy algorithm is investigated to ensure the stability of the system and achieve acceptable performance. Furthermore, the stability of the closed-loop controller–observer system is verified by utilizing the Lyapunov approach. Finally, the effectiveness and feasibility of the proposed strategy are demonstrated through its application to a VCEHS and simulation results.</p>

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Observer-Based Adaptive Fuzzy Tracking Control for a Valve-Controlled Electro-Hydraulic System in Presence of Input Dead Zone and Internal Leakage Fault

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Van Du Phan,
  • Quoc Cuong Phan,
  • Kyoung Kwan Ahn

摘要

In this article, an effective output-feedback adaptive fuzzy technique with disturbance rejection is conducted for a valve-controlled electro-hydraulic system (VCEHS), which is usually negatively impacted by lumped disturbances, dead-zone input, and internal leakage faults. First of all, the original nonlinear system is transformed into the canonical form. Additionally, adaptive fuzzy logic is applied to deal with unknown model dynamics. Next, an adaptive fuzzy extended state observer (AFESO) is used to cope with the lumped uncertainty (i.e., dead-zone input and internal leakage faults) in the VCEHS. Then, an ESO-based output-feedback adaptive fuzzy algorithm is investigated to ensure the stability of the system and achieve acceptable performance. Furthermore, the stability of the closed-loop controller–observer system is verified by utilizing the Lyapunov approach. Finally, the effectiveness and feasibility of the proposed strategy are demonstrated through its application to a VCEHS and simulation results.