Lancaster EPrints

True Digital Control of carbon dioxide in agricultural crop growth experiments

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.

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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:
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: 24 Jan 2014 06:00
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/49443

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