Greenhouse intelligent water and fertilizer mixed regulation and control system and method based on PID algorithm

Abstract

The invention discloses a greenhouse intelligent water and fertilizer mixed regulation and control system and method based on a PID algorithm, and the system comprises a fertilizer mixing barrel, a water inlet pipe, a discharging pipe, a backflow pipe, an irrigation pipe, a fertilizer barrel, and a PID control module; the fertilizer mixing barrel is provided with a containing cavity in a limited manner, the fertilizer mixing barrel is provided with a water inlet, a backflow port and a discharge port which are communicated with the containing cavity, and a first preset liquid level line and a second preset liquid level line are preset in the fertilizer mixing barrel; the water inlet pipe is communicated with the water inlet to feed water into the fertilizer mixing barrel; the first end of the discharging pipe is communicated with the discharging opening so as to discharge materials in the fertilizer mixing barrel; the first end of the backflow pipe is communicated with the second end of the discharging pipe, and the second end of the backflow pipe is communicated with the backflow opening; the first end of the irrigation pipe is communicated with the second end of the discharging pipe, and the second end of the irrigation pipe is used for irrigation; a cavity used for storing the fertilizer is defined in the fertilizer barrel, and the fertilizer barrel communicates with the backflow pipe so as to feed the fertilizer into the containing cavity; and the PID control module is connected with valves of the water inlet pipe, the discharge pipe and the return pipe. According to the regulation and control system, the stability of the ratio of water to fertilizer flowing out of the irrigation pipe can be improved.

Description

technical field [0001] The invention belongs to the technical field of intelligent agriculture and precise irrigation of water and fertilizer, and in particular relates to a system and method for controlling intelligent water and fertilizer mixing in a greenhouse based on a PID algorithm. Background technique [0002] With the vigorous development of agricultural information technology, the country also attaches great importance to smart agriculture. And the present invention is just based on this general background, derives out. [0003] Many existing water and fertilizer mixing methods include simple water and fertilizer mixing in water pipes and complex water and fertilizer mixing operations in a fertilizer mixing tank. These series of fertilizer mixing methods cannot accurately and effectively control fertilizer mixing. The phenomenon of uneven distribution of water and fertilizer ratio. [0004] The prior art provides a parameter self-tuning PID adjustment water and f...

AI Technical Summary

Problems solved by technology

[0011] In this application, by setting a return pipe between the fertilizer mixing tank and the discharge pipe, and controlling the entire return process through the PID control module, the problem of uneven water-to-fertilizer ratio can be effectively solved, and at the same time, the concentration can always meet the setting requirements The concentration value

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