System and method for precisely controlling carbon dioxide concentration in greenhouse

Abstract

The invention relates to a system and a method for precisely controlling carbon dioxide concentration in a greenhouse; the system comprises a data acquisition module which acquires carbon dioxide concentration and light intensity in the greenhouse in real time, an acquisition processor which preliminarily processes the acquired data, and a control processor which manages the ranges of the light intensity and the carbon dioxide required by photosynthesis of different crops in different growth stages; the control processor judges whether a real-time acquisition value of the light intensity is within the range of the light intensity; the difference between the real-time acquisition value of the carbon dioxide and the reasonable range of the current stage is calculated; through an output control signal, a driving circuit controls an electromagnetic valve of a carbon dioxide gas tank, so that the precise control over the carbon dioxide concentration is realized; and the invention has the functions of light intensity sensing, stage control, real-time monitoring, wireless transmission, automatic control and the like, and has the advantages of low cost, simplicity in operation and wide scope of application.

Description

technical field [0001] The invention belongs to the field of agricultural modernization, and relates to the regulation and control of the greenhouse environment, in particular to a system and method for precise regulation and control of carbon dioxide concentration in a greenhouse. Background technique [0002] CO 2 It is one of the main raw materials for photosynthesis of green plants. For every 100g of dry matter produced by plants, it needs to absorb 150g of CO 2 . Greenhouse cultivation keeps the crops in a relatively closed place for a long time, and the CO in the shed 2 The concentration varies greatly within a day, reaching a maximum value of 1‰~1.2‰ before sunrise, and falling to about 0.1‰ 2.5~3 hours after sunrise, which is only CO2 in the atmosphere. 2 Concentration (0.33‰) is about 30%, and it has been maintained until 2 hours in the afternoon before it starts to rise, and it returns to the atmospheric level at about 4 pm, and the crops need CO 2 The concentr...

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Problems solved by technology

[0003] Foreign Greenhouse CO 2 Concentration control facilities have been developed to a relatively complete level, and a certain standard has been formed, but the price is very expensive, and there is a lack of measurement and control software suitable for my country's climate characteristics

However, most of the domestic greenhouse CO 2 Concentration monitoring and control are all managed manually, which has disadvantages such as low measurement and control accuracy, high labor intensity, and irreparable losses due to untimely measurement and control.

A small number of COs that use automatic regulation 2 Concentration monitoring equipment does not consider the influence of light intensity, and uses wired methods to transmit data. The wiring is complicated, which increases the cost and reduces the flexibility and reliability of the equipment.

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