Toward the Design of Digital Hydraulic Systems Using Fuzzy Logic Control
摘要
The current technology in hydraulic systems for production processes typically relies on analog spool valves, such as analog and servo valves. However, these valves cause high power losses due to significant pressure drops during valve control. The emerging trend is to replace flow control valves with robust and cost-effective digital on/off valves, thereby reducing power losses and enhancing the overall efficiency of hydraulic systems providing hybrid (digital and analog) model descriptions. In this paper, a fuzzy control scheme is designed to achieve precise position control of a digital hydraulic actuator, including a set of 16 on/off hydraulic valves. The fuzzy controller employs a type 1 Takagi–Sugeno fuzzy inference system (FIS) feeding the performance error and its derivative. The controller's signal activates the appropriate set of on/off valves. Simulation results demonstrate the excellent performance of the closed-loop system.