title: A switched energy saving position controller for variable-pressure electro-hydraulic servo systems.
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.
authors.affiliation: Amirkabir University of Technology, Mechanical Engineering Department, 424 Hafez Ave., Tehran 15875-4413, Iran. Electronic address: alitivay@aut.ac.ir.
authors.forename: Ali
authors.initials: A
authors.lastname: Tivay
authors.affiliation: Amirkabir University of Technology, New Technologies Research Center, No. 467, Valiasr Ave., Tehran, Iran. Electronic address: mzare@aut.ac.ir.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Zareinejad
authors.affiliation: Amirkabir University of Technology, Mechanical Engineering Department, 424 Hafez Ave., Tehran 15875-4413, Iran. Electronic address: smrezaei@aut.ac.ir.
authors.forename: S Mehdi
authors.initials: SM
authors.lastname: Rezaei
authors.affiliation: Amirkabir University of Technology, Mechanical Engineering Department, 424 Hafez Ave., Tehran 15875-4413, Iran. Electronic address: k_baghestan@aut.ac.ir.
authors.forename: Keivan
authors.initials: K
authors.lastname: Baghestan
keywords: Electro hydraulic; Energy saving; Switched linear control; Variable supply pressure