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Abstract

To meet the demand for fine control of the environment of confined duct-ventilated nursery piggeries in winter in cold regions, the decoupling controller is designed based on the fuzzy control theory for graded control of environmental control and duct ventilation temperature compensation. The relative humidity deviation and carbon dioxide concentration deviation are used as the input variables, the fan speed control mode is the output amount, and the enclosure is a ventilation unit for local control. The control variables are fuzzified and defuzzified, establishing fuzzy control rules to realize the control of variable speed and variable ventilation. At the same time, in order to ensure that the air supply temperature is suitable, the duct ventilation air is preheated to realize the hierarchical control of duct ventilation and heating compensation. The regulatory system pig barn environment is simulated using Matlab / Simulink to verify the feasibility of ventilation variables and variable speed control. The simulation results show that the air supply temperature after ventilation and preheating is within the suitable growth range of nursery pigs, and all environmental parameters of the nursery piggeries meet the Chinese national standard. Multivariate environmental control provides technical support for the practical application of duct ventilation and lays a foundation for the automatic control of the environment in the piggeries.