Multi-the Greenhouse Control Technology Applied Research

Greenhouse plays an indispensable role in agriculture. The greenhouse is a ground which alters the environment of plant growth, creates the best conditions for plant growth and to avoid the effects caused by the bad weather and the season's variety. It has the appropriate use of agricultural resources and protect ecological environment, enhance agricultural production and other advantages. With the continuous improvement, of large-scale greenhouse agricultural and industrialization, requires monitoring and control of greenhouses or greenhouse distributed within a number of certain regions. Therefore, research multi-greenhouse technology is very important.Multi-greenhouse control technology object for many greenhouses and in a certain region-wide distribution, apply industrial automation technology to the modern agricultural facilities and equipment, research more greenhouse monitoring and control technology. This thesis has undertaken the following research:1. Describes the development of domestic and international greenhouse, analyse the greenhouse control, a detailed analysis of DCS, analysis of each control level of DCS and DCS hardware architecture and software systems.2. Proposed DCS-based control structure of multi-greenhouse, shows the control system plan, which contains the hardware from the PC as PC, PLC for the next bit machines, means of communication composed of three parts; software controlled in part by the configuration software program to complete control of the system3. Based on DCS control theory and the use of existing conditions the use of existing conditions,carry a number of experimental greenhouse control system hardware and software design hardware design, including data acquisition card PCI-818HD connected with the sensor design, digital output amplifier design, actuator control circuit design, the host computer's operating software-based power control configuration software of the greenhouse control system, multiple analog monitoring and control of a small greenhouse, greenhouse control technologies for multi-application authentication4. Experiments tested on the Greenhouse system. Respectively, in two different temperature requirements of seeds, for example, be divided into four groups inside and outside of the actual observation of the greenhouse germination, test system's ability of control, and in the operation of the system testing, processing, executive function were observedStudies have shown that in a number of greenhouse monitoring and control, multi-greenhouse control can satisfy the requirements of multi-level management, the management of multiple greenhouses has very important significance...