关键词: 畜牧养殖, 精准控温, 多传感器原位数据检测, 模糊PID控制

Abstract: In order to improve the performance of welfare breeding equipment for cattle and sheep grazing on grassland, an intelligent drinking water temperature control system for livestock breeding based on multisensor insitu data detection and fuzzy PID control is developed. The system is mainly composed of data acquisition module, water injection heating module, temperature control module and remote data monitoring module. The data acquisition module uses a variety of sensors to collect the water temperature, water quality, water volume and other information in the drinking water device in real time. The water injection heating module adopts the form of bottom water injection heating, which facilitates the laminar flow of water temperature from bottom to top and makes the water temperature distribution more uniform. The temperature control module adopts the fuzzy PID control algorithm based on closed loop negative feedback, which can selfadjust the PID coefficient to achieve accurate water temperature control. The remote data monitoring module is designed for users, so that users can observe the working conditions of drinking water devices in real time. The fuzzy PID temperature control test and water temperature field uniformity test verification and simulation analysis were carried out for the device. The test results showed that the fuzzy PID temperature control effect was smoother and the heating response speed was faster than the conventional PID temperature control effect. When the preset water temperature target temperature was 23 ℃ and the inlet water temperature was 7℃, 9℃, 11℃, 13℃ and 15 ℃ respectively, the maximum fluctuation of the actual heating temperature and the target temperature was only 0.3 ℃. By heating different temperature measuring points, the maximum temperature difference of different temperature measuring points on the same horizontal plane is 0.3 ℃, the temperature difference of water in different sections of the water tank is less than 0.2 ℃, and the water temperature at the temperature measuring points of the device can be accurately controlled at (23±0.5)℃. The experiment shows that the water temperature field of the drinking water temperature control device is uniform and can provide equipment support for welfare breeding.

Key words: animal husbandry, precise temperature control, multi sensor insitu data detection, fuzzy PID control