A switched energy saving position controller for variable-pressure electro-hydraulic servo systems
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Updated: Apr 28, 2026

A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
Published on: June 1, 2022
Ali Tivay1, Mohammad Zareinejad2, S Mehdi Rezaei1
1Amirkabir University of Technology, Mechanical Engineering Department, 424 Hafez Ave., Tehran 15875-4413, Iran.
Abstract:
The electro-hydraulic servo system (EHSS) demonstrates a relatively low level of efficiency compared to other available actuation methods. The objective of this paper is to increase this efficiency by introducing a variable supply pressure into the system and controlling this pressure during the task of position tracking. For this purpose, an EHSS structure with controllable supply pressure is proposed and its dynamic model is derived from the basic laws of physics. A switching control structure is then proposed to control both the supply pressure and the cylinder position at the same time, in a way that reduces the overall energy consumption of the system. The stability of the proposed switching control system is guaranteed by proof, and its performance is verified by experimental testing.
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