Journal Article

Practical advantages of inverted decoupling

Juan Garrido, Francisco Vázquez, Fernando Morilla, Tore Hägglund


This paper presents a study of the main advantages of inverted decoupling in 2×2 processes. Two simulation examples and an experimental process are used to show these advantages in comparison with simplified decoupling. The study focuses on the following practical advantages: the apparent process is the same as that obtained if one loop changes to manual; bumpless transfer and anti-windup are achieved easily using a feed-forward input in the controllers; and abnormalities of secondary loops do not affect the opposite loop. Because of this, inverted decoupling may be a good and easy way to improve the performance of industrial TITO (two inputs and two outputs) processes with interaction problems (when it can be applied).


inverted decoupling, decoupling control, simplified decoupling, bumpless transfer, proportional-integral-derivative controller, anti-windup, TITO processes


Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control, 225:7, pp. 977–992, November 2011.