Study On Monitoring And Controlling System For The Environment Of Delivery Sow House In Northern Cold Region Of China

The piggery environment has a great effect on health, growth and production of pigs. With the rapid development of piggery facilities and improvement of goingtoscale and intensification, it will be an important direction of animal husbandry in looking for pig's suitable living condition by monitoring and controlling piggery environment.The paper presents a research on environmental monitoring and controlling system of delivery sow house suitable for northern cold area of china, which involves computer technology, automatic control technology, sensor technology, fuzzy control technology and decoupling control technology. It aims to improve the internal environmental quality of pigs and increase the breeding benefit by monitoring and controlling the environment of pig house automatically. The main contents and results are as follows:⑴Establishment of internal environment monitoring and controlling system in delivery sow house.By taking the internal temperature, relative humidity and ammonia concentration of pig house as the main factors, a monitoring and controlling system of enviroment in delivery sow house has been developed, including hardware and software systems, realized the automatic monitoring and controlling of environmentin delivery sow house.⑵Research on fuzzy control theory and realization of fuzzy controller of environmental controlBased on the fuzzy control theory, a fuzzy control system was constructed, controlling the temperature, relative humidity and ammonia concentration. According to the actual needs of various parameters, the system language variables (including input variables and the output variables) were determined. The fuzzy language set for each language variable was selected, the fuzzy control rules were determined according to expert experience, and the lookup control rules were generated.⑶By analyzing the coupling problem of environmental control system a decoupling control method was proposedThe analysis of the experiments showed that there were coupling problems in the mechanical ventilation system, affecting the temperature, relative humidity and ammonia of concentration. When the ventilation system was used to lower the relative humidity and ammonia concentration, the temperature also was lowered. In order to keep the temperature steady, it needs to give calories to compensate the heat loss by using the hot water system. A superposition compensating coefficient K was used to achieve the precise control of temperature, relative humidity and ammonia concentration.⑷Validation on the feasibility of this system by implementation and experimententsThe implementation place of the system was Inner Mongolia agricultural science and technology park, located in northern cold region of China. The results of experimentents showed that the system was capable of making the relative humidity and ammonia concentration within the scope of the case and also ensured the temperature invarible. The system is feasibile and practical.