@ARTICLE{10.21494/ISTE.OP.2018.0279, TITLE={Discussing an intriguing result on model-free control}, AUTHOR={Cédric Join, Emmanuel Delaleau, Michel Fliess, Claude H. Moog, }, JOURNAL={Control}, VOLUME={1}, NUMBER={Issue 1}, YEAR={2017}, URL={https://openscience.fr/Discussing-an-intriguing-result-on-model-free-control}, DOI={10.21494/ISTE.OP.2018.0279}, ISSN={2631-4924}, ABSTRACT={An elementary mathematical example proves, thanks to the Routh-Hurwitz criterion, a result that is intriguing with respect to today’s practical understanding of model-free control, i.e., an “intelligent” proportional controller (iP) may turn to be more difficult to tune than an intelligent proportional-derivative one (iPD). The vast superiority of iPDs when compared to classic PIDs is shown via computer simulations. The introduction as well as the conclusion analyse model-free control in the light of recent advances.}}