High Performance Strategy for Compact Electro-Hydrostatic Actuation (EHA) System 

A novel strategy for high performance of electro-hydrostatic actuation (EHA) systems is studied in view of both control and circuit design. A compact EHA system has been developed for mobile purpose from the advantage of high efficiency compared to conventional servo-valve controlled hydraulic actuation system. In addition, to address the inherent control issues (i.e., nonlinear functions, system uncertainties, and even mismatched disturbances), the research presents a disturbance observer-based control (DOBC) approach based on identified nonlinear EHA system. The proposed EHA control system is expected to be applied to all mobile platforms by replacing electric motors with higher performance.