Fuzzy PID-based water and fertilizer precise ratio control system

Abstract

The invention relates to a fuzzy PID-based water and fertilizer precise ratio control system. The system includes a water supply pipeline, a fertilizer supply pipeline and a water and fertilizer mixing pipeline; the water supply pipeline and the water and fertilizer mixing pipeline are both provided with an electric valve and a flow meter; the fertilizer supply pipeline is provided with a water flow switch and a variable frequency pump; the outlet of the water supply pipeline and the outlet of the fertilizer supply pipe are both connected with the inlet of the water and fertilizer mixing pipeline; and the electric valves, the flow meters, the water flow switch and the variable frequency pump are all connected with a controller. When water and fertilizer integrated irrigation concentration-fixed fertilization is performed, the corresponding electric valves and water flow switch are opened; the variable frequency pump is adopted to absorb a fertilizer solution, and real-time concentration is obtained on the basis of the flow meters; and a fuzzy PID control method is adopted in a control process so as to constantly correct current fertilizer absorption quantity to make the difference of the current fertilizer absorption quantity and set fertilization concentration to be minimum. According to the system, the fuzzy PID control method is adopted, technologies such as a wireless sensor network technology, an embedded technology, an intelligent control technology and an electrical and electronic technology are combined, and therefore, regular and quantity-fixed irrigation of water, the fixed-concentration applying of the fertilizer solution and quantity-fixed fertilization are integrated.

Description

technical field [0001] The invention belongs to the technical field of intelligent agriculture, and in particular relates to a fuzzy PID-based precise ratio control system of water and fertilizer. Background technique [0002] In recent years, the construction of my country's facility agriculture has achieved remarkable results and achieved good economic and social benefits. However, the traditional management mode is still adopted at present, and the production process relies on manual experience and the long-term and heavy workload of farmers in the field. In particular, the amount of water and fertilizer used in the greenhouse obviously exceeds the demand by many times, resulting in a reduction in the efficiency of the greenhouse. Even if some modern glass greenhouses are equipped with integrated water and fertilizer equipment, most of them are imported from abroad, with complicated operations and high operating costs. The actual usage rate is not high. Although the wat...

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Problems solved by technology

[0003] Existing water and fertilizer integrated irrigation systems are generally divided into two categories, one is irrigation management system with high complexity, high integration and high cost; Water and fertilizer mixing system with high water pressure requirements

The first type of system cannot be popularized and used on a large scale due to the limitations of its high cost and the complexity of the operation in the use process, while the second type of system has low precision and low degree of automation. does not bring about a significant benefit increase

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