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math.OC2026
An improved input-constrained funnel controller for nonlinear systems
Thomas Berger
We present an improvement of a recent funnel controller design for uncertain nonlinear multi-input, multi-output systems modeled by higher order functional differential equations i…
math.OC2026
Some Remarks on Positive/Negative Feedback
Thomas Berger, Achim Ilchmann, Eugene P. Ryan
In the context of linear control systems, a commonly-held intuition is that negative and positive feedback cannot both be stability enhancing. The canonical linear prototype is the…
math.OC2025
Funnel control -- a survey
Thomas Berger, Achim Ilchmann, Eugene P. Ryan
The methodology of funnel control was introduced in the early 2000s, and it has developed since then in many respects achieving a level of mathematical maturity balanced by practic…