Observer-Based Time-Delay Control of a Four-Cylinder Electrohydraulic Servosystem : Stability Analysis

Abstract

The stability test method for the observer-based time-delay control system is discussed. Because there are uncertain parameters and time-delay terms in the control system, the frequency response plot based graphical method is extended and adopted to analysis the stability of the closed-loop system. The stability of the synchronous control of a four-cylinder electrohydraulic servosystem studied in Part I is verified to be stable by using the proposed method.