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Related Experiment Video

Updated: Aug 26, 2025

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator

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Published on: October 28, 2022

Angle tracking control of integrated hydraulic transformer inner loop servo system.

Wei Shen¹, Jingxian Pan¹

¹Department of Mechatronics Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.

ISA Transactions

|October 3, 2022

Summary

This study introduces a novel finite-time backstepping filter control strategy for hydraulic transformers. The advanced control ensures significant energy savings in valve-controlled hydraulic swing motor systems, even with input delays and constraints.

Keywords:

Finite-time Hydraulic transformer State constraints Time-delay Valve-controlled swing motor system

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Area of Science:

Engineering
Control Systems
Hydraulic Systems

Background:

Integrated hydraulic transformers utilizing common pressure rail systems offer substantial energy savings.
Effective control of the inner loop, specifically the valve-controlled hydraulic swing motor system, is critical for overall system performance.

Purpose of the Study:

To design a robust control strategy for the inner loop of an integrated hydraulic transformer.
To address challenges including input delay, output constraints, and real-world operating conditions.
To guarantee the energy-saving performance of the hydraulic transformer system.

Main Methods:

An extended state observer (ESO) was developed to estimate system states and unknown terms.
Pade approximation was used to transform the system's state equation, accounting for input delay.
A finite-time backstepping filter control algorithm was designed for robustness and constraint satisfaction.

Main Results:

The proposed extended state observer-based finite-time backstepping filter control strategy was successfully implemented.
Experimental comparisons demonstrated the effectiveness of the new control algorithm over traditional methods.
The strategy ensured system output remained within defined constraints while maintaining stability.

Conclusions:

The developed control strategy effectively enhances the energy-saving performance of integrated hydraulic transformers.
The method provides a robust solution for controlling valve-controlled hydraulic swing motor systems under complex conditions.
This approach offers a promising advancement in the field of hydraulic control systems.