A two-layered fuzzy logic controller for systems with deadzones |
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Authors: | Jong-Hwan Kim Jong-Hwan Park Seon-Woo Lee Chong E.K.P. |
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Affiliation: | Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Taejon, South Korea; |
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Abstract: | Existing fuzzy control methods do not perform well when applied to systems containing nonlinearities arising from unknown deadzones. In particular, we show that a usual "fuzzy PD" controller applied to a system with a deadzone suffers from poor transient performance and a large steady-state error. In this paper, we propose a novel two-layered fuzzy logic controller for controlling systems with deadzones. The two-layered control structure consists of a fuzzy logic-based precompensator followed by a usual fuzzy PD controller. Our proposed controller exhibits superior transient and steady-state performance compared to usual fuzzy PD controllers. In addition, the controller is robust to variations in deadzone nonlinearities. We illustrate the effectiveness of our scheme using computer simulation examples.<> |
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