Abstract
This study’s purpose is to design the controlled system that compensates the time delay and disturbance on a pilot operated proportional pressure relief valve. This relief valve is driven by pilot pressure and this pilot pressure transfers into the orifices and chambers. So this kind of hydraulic valves always have the time delay. A time delay lets the system to unstable when system has large open loop gain.BR In this study, a SMC(Sliding mode controller) and Smith predictor were used as controller. A SMC is an one of best controller which can be used on the system that has uncertainty. A Smith predictor can compensates time delay during to keep the controller’s characteristics. This study also deals with a disturbance observer. A steady state error will be come out from modeling error and disturbance when used the smith predictor. This steady state error have to be recovered to satisfy the controller’s goal. A disturbance observer was selected as a solution. A controlled system was verified by computer simulation.
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