A fuzzy logic controller (FLC) designed as a suction controller is pro
posed. Firstly, we prove that there exists a switching line in the FLC
, and the slope of the switching line is determined by scaling factors
. Secondly, a Lyapunov function is selected and sufficient conditions
for the fuzzy control system (FCS) to be globally asymptotically stabl
e is determined. Based on the sufficient conditions, a design procedur
e is suggested to guarantee that the FCS is globally asymptotically st
able. Both a nonlinear oscillator and a cart-pole system are simulated
to demonstrate the proposed FLC. We show that not only is the FLC sim
ilar to sliding mode control (SMC), but also a realizable method for a
suction controller is described. In addition, a lemma is introduced t
o interpret that the rise time of the FCS can be adjusted by the scali
ng factors. (C) 1997 Elsevier Science B.V.