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A greenhouse is , as the name implies, a way to use its own advantages to create an environment conducive to crop growth. It can protect crop growth from the effects of weather changes in the four seasons. Cultivate winter ingredients or flowers in hot summers, or in cold Winter season cultivates summer ingredients or flowers. Greenhouse production is mainly aimed at regulating crop production period, promoting crop growth, controlling pests and diseases, and increasing crop yield.
Research on greenhouse temperature and humidity monitoring systems in foreign countries began in 1970. The combination instrument is used to collect field information and record the data collected on the site and then manually control its environmental changes. In the late 1980s, distributed greenhouse temperature and humidity control systems appeared abroad. At present, developed countries are developing computer data acquisition integrated control systems, and many greenhouses are moving towards full automation, intelligence, and unmanned operation on the basis of automation.
China's research on greenhouse temperature and humidity monitoring system began in 1980. On the basis of absorbing the control technology of greenhouse temperature and humidity monitoring system in developed countries, China has gradually mastered the indoor microcomputer control technology, but this technology is limited to the detection and control of single environmental factors such as temperature, humidity and CO2 concentration. In recent years, China has only achieved automation and intelligence in greenhouse temperature and humidity monitoring systems.
From the perspective of the development of greenhouse temperature and humidity control systems at home and abroad, the development of greenhouse control systems can be roughly divided into three stages:
Phase: manual control phase.
This is the control method used in the early stage of the greenhouse temperature and humidity control system. In this stage, the greenhouse temperature and humidity control system does not actually have a real control system and implementing mechanism. Managers are sensors that detect the environmental parameters of the greenhouse, and they need to artificially control the equipment in the greenhouse. They are the core of the greenhouse temperature and humidity control system. They use long-term observation records of climate conditions and crop growth conditions inside and outside the greenhouse, and use their long-term accumulated experience to infer and judge, to manually adjust and control the environment inside the greenhouse. Growers use manual control methods, although this is effective in responding to crop growth conditions, and it also conforms to the production laws of traditional agriculture . However, this control method has low efficiency and is not suitable for large-scale production. And the artificial control stage has higher requirements on the manager's own comprehensive quality and actual planting experience.
The second stage: the automatic control stage.
After World War II, manual production methods have gradually been replaced by mechanical equipment. At this stage, the greenhouse has a relatively complete monitoring system. Each greenhouse has many types of sensors that collect greenhouse environmental data. The greenhouse temperature and humidity control system in this period can monitor environmental changes in real time, and it has control Rights of executive agencies; good man-machine interface makes manager's operation process image and simple. This kind of greenhouse temperature and humidity control system only needs the manager to enter the target parameters of the environment required for crop growth in the greenhouse. The greenhouse temperature and humidity control system will compare the actual measured values of the sensors with the target values set by the manager. Will control the corresponding mechanism for heating, cooling, humidification or ventilation. Computer-controlled greenhouse control technology realizes production automation and is suitable for large-scale production, which greatly improves labor productivity.
The third stage: the intelligent control stage.
The intelligent control stage is a greenhouse expert control system suitable for the growth of different crops on the basis of greenhouse automatic control technology and production practices. The intelligent control technology is a combination of an agricultural expert system and an automatic greenhouse control system . It will use historical data to automatically select an adjustment plan that is beneficial to crop growth. management. This control method not only conforms to the laws of crop growth, but also makes full use of the advantages of modern computer technology, making the system control very fast, convenient and effective, reducing the need for labor and waste of manpower. Greenhouse greenhouse expert control system technology is an ideal and promising control method.
The technology of greenhouse temperature and humidity control system follows the development process of all-manual-semi-automatic-intelligent control, and develops in the direction of more and more advanced equipment and more and more perfect functions. Chengdu Xinxin Electronic Technology Co., Ltd. combines advanced modern technology. In the near future, it will create a new chapter for greenhouse temperature and humidity control systems.
July 7, 2015
Chengdu Xinxin Electronic Technology Co., Ltd. Editorial Department
Editor: Little Devil in Gourd