Robust Output-feedback Control for Piloted Electro-hydraulic Proportional Pressure-reducing Valve

摘要

The paper aims at piloted electro-hydraulic proportional pressure-reducing valve characteristics of uncertain parameters, immeasurable states and effect of load flow, designed an observer including load flow and it's feedback controller, achieve robust output-feedback control to the output pressure. Based on linear matrix inequalities, theoretical analysis showed that the system was stable and had robust H-infinity performance, given the method to obtain the observer gain L and controller gain K. By simulating a certain proportional pressure reducing valve, verified the validity of the algorithm, eliminated the influence of load flow to output pressure and ensured it following the set pressure quickly.