Taylor, C. James and Lees, Matthew and Young, Peter and Minchin, P. E. H. (1996) True Digital Control of carbon dioxide in agricultural crop growth experiments. In: International Federation of Automatic Control 13th Triennial World Congress. Elsevier.Full text not available from this repository.
The paper outlines the design of Proportional-Integral-Plus (PIP) controllers for regulating the level of carbon dioxide in a closed loop apparatus used for carbon-11 tracer experiments in plants. The system, which behaves essentially as an integrator with a four sample time delay, is quite difficult to control using conventional methods because of the rather limited pulse-width-modulated input signal. In contrast, optimal PIP designs, which exploit a special Non-Minimum State Space (NMSS) form within a Linear Quadratic (LQ) optimisation context, are able to maintain the gas concentration to within 2 ppm of the set point.
|Item Type:||Contribution in Book/Report/Proceedings|
|Uncontrolled Keywords:||automatic control ; LQG control ; pulse width modulation ; modelling ; agriculture|
|Departments:||Faculty of Science and Technology > Engineering|
Faculty of Science and Technology > Lancaster Environment Centre
|Deposited On:||08 Aug 2011 13:18|
|Last Modified:||26 Jul 2012 22:56|
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