Modelling and Control Design for Free Air CO2 Enrichment Systems Used in Plant Physiology Atmospheric Change Experiments

Abstract The Proportional-Integral-Plus (PIP) control methodology is applied to a Free-Air CO 2 Enrichment (FACE) system at the Institute of Terrestrial Ecology (ITE). FACE systems are used to produce predicted atmospheric change conditions, enabling plant growth experiments to be carried out in elevated carbon dioxide concentrations for in situ crops. Evaluation was started at ITE in December 1996 with promising initial results.