基于单片机的温度与湿度解耦控制系统设计外文文献及中文翻译
Temperature and humidity decoupling control
system design based on MCU
Climate conditions control emphases of automatic control greenhouses introduced from abroad are different from these in home and the introducing and production cost of them is so high ,so it is difficult to popularize and use cosmically .At present, in greenhouses designed and built in home itself，the degree of environment control and modern management of most of them is so low ,so they cannot satisfy crops' demand for high production and planting all the year; some can only carry out control on partial environment factors without considering mutual affect and coupling of them in the process of control; some still need manual control;so these factors greatly restrict exertion of economic benefit of greenhouses .Changing traditional modes of control; practicing computer monitoring and establishing greenhouse automatic monitoring system accord with the situation of China have important meaning for quickening modern degree of greenhouse production in our
country and increasing benefit of greenhouses.
Based on summarizing formers' researches, the paper analyzes environmental parameters，the integrative control property of greenhouse systems and the control process which is a nonlinear, delay and complicated system; Based on analyzing modes of
current greenhouse monitoring systems and properties of single-chip microcomputers, a practical automatic monitoring system for greenhouse environment is designed which can realize the monitoring of every parameter in greenhouse environment by synthetically using sensor technology, fuzzy control theory, communication technology and microcomputer technology
The system hardware is composed of two parts: a lower-level and a higher-level computer. The higher-level computer is a PC microcomputer which is the headquarter of the system and finishes the unified management and control of a greenhouse by way of COM port RS-232 connecting with the lower-level computer. In monitoring environment, the system can finish monitoring for this nonlinear and delay system and realize crops' demand for greenhouse environment by using fuzzy control theory and technology .The central component of the lower-level computer is 8098 single-chip microcomputer of MCS-96 series, which is used to collect, retreat control and communicate with the higher-level computer. The system software consists of two parts .The higher-level software is developed by VB and composed of seven modules of setting system parameters, demarcating sensors, ascertaining fuzzy control table, connecting and monitoring real-time data, recurring to history data and
基于单片机的温度与湿度解耦控制系统设计外文文献及中文翻译
help, and each module has certain function and each other is independent from others. The lower-level software is developed by 8098 assemble language and composed of six modules of a main program, a sending and interrupting service program, a receiving and interrupting service program, ascertaining a sampling cycle, connecting data and pretreating data. Simulative experiment shows that the whole system is convenient to operate，high efficient, easy to expand, has better adaptability and universal property and establishes certain base for realizing control system design with many factors in greenhouse environment.
Key words: Automatic control, Greenhouse, Single-chip microcomputer,
Computer monitoring and controlling, Fuzzy control
一 Foreword
Along with calculator technique of development, the calculator data collect a technique and control the system acquire in the production line automation Extensive of application, it is comprehensive the calculator, data collect, the process control, network communication and sketch manifestation etc. technique, With the information obtain, processing, supervision with excellent turn a production line for purpose, have function strong, application vivid, operation squareThen etc.
characteristics, have thus extensive of application foreground Gal. Be close to more than ten in the last yearses, it F the beginning is to the agriculture research, produce to get The area permeate and promoted tradition agriculture production control mode to calculator imitate, auto control mode change.Especially establish Agriculture of rise and glasshouse cultivation technique of expansion, acceleration the calculator is on the agriculture of application step[atl Iasl fttl.Together Hour control theories also along with industry and modern science technique and fly of calculator soon development but experience from\theories\and\control theories\one\control theories\Of a few stage.Misty control theories along with calculator technique of progress and oneself theories of continuously development, at not line Of, complications of hard establishment precision mathematics model of in the system get extensive of application。 Glasshouse supervision technique is with auto examination technique, intelligence control theories, calculator technique of development but development get up.70's, adoption imitate type unit combination the appearance collect the spot information, and with correspond of imitate type equip carry on designation, Record and control.80's, adoption numeral type unit combination the appearance accept the spot information, and with correspond of numeral type
Equip to carry on manifestation, record and control.Along with the 4 C
基于单片机的温度与湿度解耦控制系统设计外文文献及中文翻译
Commuputer. Communication, CRT, Control Fly of technique soon development, 80's the end appeared a distribute type control system and pass monitor unit, control unit's etc. establish Have collect the spot information combine realization part control. The data of this system collect, communication, adjust the ability of control strong, make supervision The technique attain a new level.90's, creation the calculator data collect with control system, it have a distribute type
Control the system collect, saving, communication, processing function, again compensate distribute type system big, price Gao, application inconvenience Of shortage, so got in the work agriculture the automation extensive of application
二 Domestic and international development circumstance
Glasshouse conduct and actions 1 kind is the farm crop growth create feat environment of agriculture facilities, can see into a half independence in nature Boundary the half of the big weather close type of artificial eco-system, it can avert from the external world various disadvantageous factor of influence, improvement or Create better environment weather. Along with calculator technique of progress and intelligence control theories of development, hundred years come, The room is a facilities agriculture of importance constitute part, it auto control and management technique continuously can exaltation, in the world-wide locations All got a substantial development[3].Especially 20 century ask of the fast fierce development and microcomputer of technique of the 7 0 age electronics A life time, more make the control technique of the glasshouse environment creation revolution variety. The glasshouse control mostly experienced” move one machine-Dispersion the electricity control system a multi-function concentration electronics control set one the tiny machine be comprehensive control” this several development stage, tradition of glasshouse Control method, all existence obvious of blemish, adoption these way, imitate complications the farm crop in the weather environment place of Partial environment almost and impossibly of, want a realization rightness various mutually check and supervision, mutually influence of synthesize of environment factor control Also very difficulty.80's, change with each passing day along with the microcomputer of the progress and price be significant to descend, and to glasshouse The exaltation of environment request, take tiny machine as the glasshouse of core comprehensive environment control system, at Europe and America and Japan acquire substantial of
Development, and exceed to turn intelligence to turn a stage into the network
Abroad modernization glasshouse of inner part facilities already development to more complete extent, and formation certain of standard. Each environment factor in the glasshouse mostly from calculator