Title :
A new type of control method for electro-hydraulic Servo systems
Author :
Li, Hong ; Xiong, Shibo
Author_Institution :
Inst. of Mech. & Electron. Eng., Taiyuan Univ. of Technol., Taiyuan
Abstract :
Internal model control (IMC) has been widely used because of its easily designed method and simple tuning policy. But better performance cannot be obtained when it is used in hydraulic servo system control directly because of the systemspsila uncertainties, time varying and highly nonlinear characteristics due to the flow-pressure relationship, oil leakage, oil temperature variation, load disturbances, integrating characteristic and the high open-loop gain. In this paper a kind of two-degree-of freedom IMC method for Electro-hydraulic servo systems is prompted in which a classical foreword internal model controller and a novel feedback fuzzy controller are designed. The transfer-function-based factorization approach in the frequency domain is used to analyze the stability of the system. Simulation experiments show better dynamic performance and disturbance rejection.
Keywords :
electrohydraulic control equipment; feedback; frequency-domain analysis; fuzzy control; nonlinear control systems; open loop systems; servomechanisms; stability; time-varying systems; transfer functions; uncertain systems; electro-hydraulic servo system; feedback fuzzy controller; flow-pressure relationship; frequency domain analysis; internal model control; nonlinear characteristic; oil leakage; oil temperature variation; open-loop system; system stability; time varying system; transfer-function-based factorization approach; uncertain system; Control system synthesis; Control systems; Design methodology; Nonlinear control systems; Open loop systems; Petroleum; Servomechanisms; Temperature control; Time varying systems; Uncertainty; Electro-hydraulic servo systems; fuzzy system; two-degree-of freedom internal model control;
Conference_Titel :
Intelligent Control and Automation, 2008. WCICA 2008. 7th World Congress on
Conference_Location :
Chongqing
Print_ISBN :
978-1-4244-2113-8
Electronic_ISBN :
978-1-4244-2114-5
DOI :
10.1109/WCICA.2008.4593906
