Disturbance observer–based nonlinear energy-saving control strategy for electro-hydraulic servo systems

Weiping Wang,Bo Wang

doi:10.1177/1687814017705842

Abstract

Precise tracking performance and significant energy-saving effect are both important issues for electro-hydraulic servo system. Nevertheless, the electro-hydraulic servo system usually demonstrates...

Highlights

The electro-hydraulic servo system (EHSS) has been demonstrated to be a promising choice for diverse applications due to its high power density, ease of implementation, good dynamic performance, and durability, despite the rapid development of electric power transmission
Many papers are devoted to solving the problem of high-performance position tracking control of EHSS, and numerous successful methods for specific purposes were proposed.[2,3,4,5]
The results demonstrate that the position tracking performance is satisfied with a maximum tracking error of 1.2 mm

Summary

Introduction

The electro-hydraulic servo system (EHSS) has been demonstrated to be a promising choice for diverse applications due to its high power density, ease of implementation, good dynamic performance, and durability, despite the rapid development of electric power transmission. Many papers are devoted to solving the problem of high-performance position tracking control of EHSS, and numerous successful methods for specific purposes were proposed.[2,3,4,5] the EHSS usually has a lower energy efficiency compared with other actuation methods, which may limit its further utilization in industrial and mechanical equipments. The discrepancy between the real values and the nominal parameters utilized in the aforementioned studies and the uncertain nonlinearities including unmodeled dynamics and external disturbance have not been fully considered in the design of the VSPC and the tracking controller. The energy-saving performance and the achievable position tracking performance of these systems may degrade when the system suffers from the lumped uncertainties including parametric uncertainties and uncertain nonlinearities Both precise tracking and significant energysaving performance are critical problems of the EHSS.

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Result and discussion

Conclusion