Studies on Control Systems of Greenhouse Environment. (Part II). Calculation and Control of Set-points for Tomato Cultivation by Fuzzy Theory.:Calculation and Control of Set-points for Tomato Cultivation by Fuzzy Theory

概要

論文の詳細を見る
The determination of the desired values of climate factors is important for achieving contorl environment of greenhouse.Investigations about semi-forcing culture of tomato were made for 20 farmers in Niigata prefecture. With the results of investigations, such as yield, cost of heating, quality of fruit, growing stage, weather and horticultural experience ete., the optimal set-points were realized by fuzzy inference. Besides this, to reduce the consumption of energy and also to improve the response characteristics of control system, the climate control experiments in the model house were carried out using fuzzy theory. The threshold for set-points can be made change according to the rate of change of temperature and humidity, the properties of this control system were examined. In comparison to this control, the general ON/OFF control experiments were also made.As the result, for the temperature control, the errors of the fuzzy control is less than that the ON/OFF control. For the ventilation control, the control error is less than the ON/OFF control. For the sophisticated control of temperature and humidity, there is no difference between fuzzy control and ON/OFF control for temperature, but for humidity the overshoot and control error are restrained as low level for the fuzzy control.
農業施設学会の論文