Fault Detection for Electro-Hydraulic Valve-Controlled Single Rod Cylinder Servo System Using Linear Robust Observer

This paper presents a method of linear robust observer design for electro-hydraulic valve-controlled single rod cylinder servo system fault detection. Firstly, the paper outlines the difficulties associated with modeling nonlinear observer and the dynamic equations of the system. Secondly, the linear modeling process is recapped by highlighting the likely uncertainties which influence the implementation of model-based approaches. Thirdly, the linear robust observer is designed in the presence of unknown inputs, such as adscititious force disturbance, linearization error, parameters fluctuation, process noise, measurement noise. Finally, experiments show that this observer has the ability to reject disturbance and reliably respond to the fault due to oil leakage.