Position Control of Electrohydraulic Actuator Using Triangular Position Signal in Open Loop Control

Electrohydraulic actuation systems are widely used in a variety of industries, including robotics, manufacturing, mining, agriculture, and vehicle manufacturing. Some industries, such as agriculture and mining, require low or medium control accuracy, which can be achieved with an open-loop control strategy, whereas others, such as robotics and manufacturing, require higher control accuracy, which can be achieved with an advanced closed-loop control strategy. In this paper, an electrohydraulic actuation system with a novel experimental setup is used to control the actuator position using an open-loop control strategy. For this purpose, a triangular signal with an amplitude of 100 mm and frequencies of 0.05 Hz, 0.10 Hz, and 0.20 Hz is fed into the system, and the response of the actuator position is analyzed. To process the signals, the National instrument (NI) controller was used in conjunction with the LabVIEW program. Experiment results show that position tracking error is lowest, error evaluation parameter correlation coefficient is highest, and mean absolute error and root mean square error are lowest at lower frequencies (0.05 Hz) compared to higher frequencies (0.10 Hz and 0.20 Hz).