Temperature control algorithms for a refinishing spray booth

In the paper, a comparative analysis of control algorithms in the temperature control system for spray booths is presented. Additionally, basic technological limits which may have some influence on the quality of control are described. From technological point of view, a typical spray booth operates in two modes i.e. coating and drying, which are related to different temperature work points. In practice, it is the main reason of changes in plant dynamics, precisely changes in dynamical parameters of the spray booth. The authors analyzed other technological factors which might disturb the temperature inside the booth and finally make a painted covering worse or even useless. The main idea was to find robust control algorithms, mainly for temperature control, which make the process stable in any working point. In the final part of the paper, selected real time experiments are presented to show typical working modes of the spray booth and to proof the robustness of the developed and implemented control algorithm.