STUDY ON SENCOND-ORDER SLIDING MODE CONTROL LAW FOR ELECTRO-HYDRAULIC SERVO SYSTEM

Abstract

Abstract: Aiming at the tracking control problem of electro-hydraulic servo system with uncertainties and nonlinearities, the second-order sliding mode(SOSM)control algorithms based on time optimal control and Lyapunov function are researched. The problems existed in the existing time-optimal sliding mode control law are analyzed, and an improved SOSM control algo-rithm with nearly time-optimal control is developed to effec-tively reduce chattering and enhance responding speed without losing robustness of the system. Taking the steering system model of practical transporting and lifting machinery as exam-ple, the simulation study on the algorithm is carried out, and its effectiveness is confirmed.

Key words: Chattering, Electro-hydraulic servo system, Robustness, Sliding mode control, Time optimal

CLC Number:

TP273 TH137

Li Yunhua;Yang Liman;Zhang Zhihua. STUDY ON SENCOND-ORDER SLIDING MODE CONTROL LAW FOR ELECTRO-HYDRAULIC SERVO SYSTEM[J]. , 2005, 41(3): 72-75.

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STUDY ON SENCOND-ORDER SLIDING MODE CONTROL LAW FOR ELECTRO-HYDRAULIC SERVO SYSTEM

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