The robustness of T-systems, a kind of fuzzy control systems, is the focus
of this paper. First, the T-Systems based on related fuzzy theories are pro
posed and defined. Then, a L-controllable condition for the T-systems is gi
ven and proven. A criterion for the robust controllability of the fuzzy con
trol systems under directional disturbance is derived at last. On the whole
, this work provides an approach to analyze the properties of fuzzy control
systems. (C) 2000 Elsevier Science B.V. All rights reserved.