Fuzzy deadband compensator

Abstract

Abstract

The presence of deadband in actuators can cause unacceptable control performance such as steady state error in the system. This work is focused on type 1 systems with deadband in the actuators. Incorporating integral action in the controller can eliminate this static error, but at the expense of having overshoot or oscillatory response, which is unacceptable in many positioning systems. The fuzzy deadband compensator proposed here operates on top of the existing controller and does not require a priori knowledge of the size of the deadband. The fuzzy deadband compensator employs variable ‘waiting time’ before the deadband is taken out. An element of patience is introduced in the compensator to prevent overcompensation. The compensator was successfully tested to a hydraulic servomechanism.