STUDY ON A ROBUST CONTROLLER FOR ELECTRO-PNEUMATIC SERVO SYSTEM

Abstract

The ready studies show that the characteristics of an electropneumatic servo control system (EPSCS) can be improved remarkably by employing of the state-feedback technique. But the control error of such a system cannot be ignored, especially when there exits large external disturbance, and its stiffness is not satisfied.
In this paper, the authors propose a robust control scheme, and develop a design method for robust controller, when the controlled object or plant is unstable, as in the case of EPSCS.
The robust controller is drived by system error and it can eliminate the error to zero. So, as confirmed by simulations and experiments, the system has almost infinite stiffness and can follow the input signal perfectly.