Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
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TY - GEN
T1 - True Digital Control of carbon dioxide in agricultural crop growth experiments
AU - Taylor, C. James
AU - Lees, Matthew
AU - Young, Peter
AU - Minchin, P. E. H.
PY - 1996
Y1 - 1996
N2 - 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.
AB - 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.
KW - automatic control
KW - LQG control
KW - pulse width modulation
KW - modelling
KW - agriculture
M3 - Conference contribution/Paper
BT - International Federation of Automatic Control 13th Triennial World Congress
PB - Elsevier
ER -