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.Abstract
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 |
| Subjects: | UNSPECIFIED |
| Departments: | Faculty of Science and Technology > Engineering Faculty of Science and Technology > Lancaster Environment Centre |
| ID Code: | 49443 |
| Deposited By: | ep_importer_pure |
| Deposited On: | 08 Aug 2011 13:18 |
| Refereed?: | No |
| Published?: | Published |
| Last Modified: | 26 Jul 2012 22:56 |
| Identification Number: | |
| URI: | http://eprints.lancs.ac.uk/id/eprint/49443 |
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