Abstract
Nowadays, considering the development of the industry, hydraulic actuator has a wide range of application fields. This paper presents a kind of hydraulic load simulator for conducting performance and stability test for control force of hydraulic hybrid systems. A grey prediction model GM(1,1) combined with a fuzzy PID controller is suggested to apply for this system. Furthermore, fuzzy controllers and a tuning algorithm are used to change the Grey step size to improve the control quality. The grey prediction compensator can improve the system settle time and overshoot problems. Simulations and experiments are carried out to evaluate the effectiveness of the proposed control method applied for hydraulic systems with varied external disturbance as in real working conditions.
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