CN101813954B - High-temperature variability temperature and humidity environmental test control method and device - Google Patents
High-temperature variability temperature and humidity environmental test control method and device Download PDFInfo
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- CN101813954B CN101813954B CN2010101582321A CN201010158232A CN101813954B CN 101813954 B CN101813954 B CN 101813954B CN 2010101582321 A CN2010101582321 A CN 2010101582321A CN 201010158232 A CN201010158232 A CN 201010158232A CN 101813954 B CN101813954 B CN 101813954B
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Abstract
The invention discloses a high-temperature variability temperature and humidity environmental test control method and a device. In the method, a high-power electric heating group is utilized in a test box to realize the process of temperature rise, liquid nitrogen is infused by a liquid nitrogen device to realize the process of temperature reduction, a steam generating device is used for realizing the process of wetting, and the liquid nitrogen device is used for infusing the liquid nitrogen to realize the process of dehumidification. The device comprises the test box, and a temperature and humidity control system, wherein the temperature and humidity control system consists of a programmable logic controller (PLC), a temperature sensor, a humidity sensor, the high-power electric heating group, the liquid nitrogen device, the steam generating device and a fan. The method and the device can well realize decoupling control between the temperature and the humidity in the test environment under a large temperature variability condition, and can meet the requirements of the temperature and humidity control system of a reliability enhancing test device.
Description
Technical field
The invention belongs to the artificial environment control technology, be specifically related to a kind of method and device of Temperature and Humidity Control, especially can realize the accuracy control method and the device of humiture under the condition of high temperature variability.
Background technology
At present, known artificial environment Temperature and Humidity Control method is made up of execution units such as controller, metering circuit and exsiccator, blower fans, is applied to growth cabinet, barn isothermal humidity environment changes situation slowly more.But the relation of temperature and humidity is very tight.In the environment of an appointment, variation of temperature can influence humidity; Same, the fluctuation of humidity also can exert an influence to the temperature in the environment.Therefore, realize the control problem of humiture under the condition of big temperature variability, conventional Temperature and Humidity Control method exists very big difficulty.
Summary of the invention
In order to solve in the control problem between the humiture under the condition of big temperature variability, the objective of the invention is to propose a kind of high-temperature variability temperature and humidity environmental test control method and device, this method and apparatus can be realized the control of the decoupling zero between temperature, the humidity in the test in the phase mutual interference that overcomes well under the condition of big temperature variability between temperature, the humidity environment.
The technical solution adopted for the present invention to solve the technical problems is: in order to realize the wide variation of temperature, humidity, the inventive method is in chamber, realizes temperature-rise period with the heating of large power, electrically heating group, injects liquid nitrogen with liquid nitrogen plan and realizes temperature-fall period; Realize humidification with steam generating device, inject liquid nitrogen with liquid nitrogen plan and realize dehumidification process.
In the described dehumidification process, liquid nitrogen reinjects behind the heating arrangement heating and dehumidification earlier in the chamber.
Further method is: temperature sensor and humidity sensor are set in chamber, real time temperature, humidity data in the detected chamber of temperature sensor and humidity sensor pass to Programmable Logic Controller PLC by signal conversion module, Programmable Logic Controller PLC compares and carry out compensated decoupling and fuzzy control program with its sampled value and setting value: when sample temperature was lower than setting value, Programmable Logic Controller PLC was by the output control large power, electrically heating group heating of digital output port; When sample temperature was higher than setting value, Programmable Logic Controller PLC was by the refrigeration solenoid valve folding on the output control liquid nitrogen plan of digital output port, with control liquid nitrogen injection rate IR in chamber; When sampling humidity was lower than setting value, Programmable Logic Controller PLC was by the humidification solenoid valve folding on the output control water vapor generation device of digital output port, with the injection rate IR of control water vapor in chamber; When the humidity of sampling was higher than setting value, Programmable Logic Controller PLC made humidity reduction in the chamber by the folding of the output control dehumidifying solenoid valve of digital output port with control liquid nitrogen injection rate IR in chamber, and the humiture value in chamber meets the demands.
Apparatus of the present invention according to said method adopts comprise chamber, temperature and humidity control system; Described temperature and humidity control system is made up of Programmable Logic Controller PLC, temperature sensor, humidity sensor, large power, electrically heating group, liquid nitrogen plan, water vapor generation device, fan; Described liquid nitrogen plan is communicated with the chamber inner chamber by refrigerator pipes and dehumidification pipe, steam generating device is communicated with the chamber inner chamber by the humidification pipe, be respectively equipped with refrigeration solenoid valve, dehumidifying solenoid valve and humidification solenoid valve on refrigerator pipes, dehumidification pipe and the humidification pipe, temperature sensor and humidity sensor all are located in the chamber, fan and large power, electrically heating group are located at the top in the chamber, and temperature sensor, humidity sensor, fan, dehumidifying solenoid valve, refrigeration solenoid valve, humidification solenoid valve all are connected with Programmable Logic Controller PLC with large power, electrically heating group.
What also be provided with upper and lower opening in the chamber of apparatus of the present invention is used for air-flow round-robin air channel, and described fan and large power, electrically heating group are located in the air channel of chamber inner top.
Described dehumidification pipe is provided with heating arrangement.
With the inventive method and device, can under the condition of big temperature variability, well realize temperature, the control of the decoupling zero between the humidity of experimental enviroment inside, satisfy the demand of reliability intensifying testing equipment temperature, moisture control system.
Description of drawings
Fig. 1 is the theory diagram of apparatus of the present invention.
Fig. 2 is the structural representation of apparatus of the present invention.
Fig. 3 is the compensation decoupling zero controlling schemes figure of the inventive method.
Embodiment
High-temperature variability temperature and humidity environmental test control method is in chamber, realizes temperature-rise period with high-power heating group heating, injects liquid nitrogen with liquid nitrogen plan and realizes temperature-fall period; Realize humidification with steam generating device, realize dehumidification process with the liquid nitrogen that liquid nitrogen plan injects behind the heating arrangement heating and dehumidification.
Described method can adopt automatic control mode to realize, the apparatus of the present invention that adopted comprise chamber 18, are located at the temperature and humidity control system in the chamber 18 as shown in Figure 1 and Figure 2; Described temperature and humidity control system is made up of Programmable Logic Controller PLC, temperature sensor 16, humidity sensor 17, large power, electrically heating group 15, liquid nitrogen container 1, steam generator 8, fan 12; Liquid nitrogen container 1 is divided into refrigerator pipes 3 by the person in charge 2 and dehumidification pipe 5 is communicated with chamber 18 inner chambers, steam generator 8 is communicated with chamber 18 inner chambers by humidification pipe 22, dehumidification pipe is provided with heating arrangement 7, refrigerator pipes 3, be respectively equipped with refrigeration solenoid valve 4 on the dehumidification pipe 5, dehumidifying solenoid valve 6, humidification pipe 22 is provided with humidification solenoid valve 21, pressure limiting switch 20 and temperature limit switch 19, temperature sensor 16 and humidity sensor 17 all are located in the chamber 18, be provided with upper and lower opening 13 in the chamber 18,23 be used for air-flow round-robin air channel 9, two desk fans 12 and large power, electrically heating group 15 are located in the air channel 9 of chamber 1 inner top, temperature sensor 16, humidity sensor 17 is connected with Programmable Logic Controller PLC by the A/D signal conversion module, fan 12, refrigeration solenoid valve 4, dehumidifying solenoid valve 6 is connected with Programmable Logic Controller PLC by digital module with humidification solenoid valve 21, the electrical heating group that large power, electrically heating group 15 is 150kw by 5 groups of power is formed, and passes through photo thyristor, digital module is connected with Programmable Logic Controller PLC; Chamber 18 tank walls are provided with view window 10, and the bottom is provided with drainpipe 11, and inside is provided with testing table 14.
During apparatus of the present invention work, the air-flow that fan 12 makes chamber 18 inner chambers 9 forms circulative convection up and down through the air channel, real time temperature, humidity data in temperature sensor 16 and the humidity sensor 17 detected chambers 18 pass to Programmable Logic Controller PLC by the A/D signal conversion module, Programmable Logic Controller PLC compares and carry out compensated decoupling and fuzzy control program with its sampled value and setting value: when sample temperature was lower than setting value, Programmable Logic Controller PLC was by output large power, electrically heating group 15 heating of digital output module and control photo thyristor; When sample temperature was higher than setting value, Programmable Logic Controller PLC was by refrigeration solenoid valve 4 foldings on the output control liquid nitrogen plan of digital output module, with control liquid nitrogen injection rate IR in chamber; When sampling humidity was lower than setting value, Programmable Logic Controller PLC was by humidification solenoid valve 21 foldings on the output control steam generating device of digital output module, with the injection rate IR of control water vapor in chamber; When sampling humidity was higher than setting value, Programmable Logic Controller PLC made humidity reduction in the chamber by the folding of the output control dehumidifying solenoid valve 6 of digital output module with control liquid nitrogen injection rate IR in chamber, and the humiture value in chamber meets the demands.During actual motion, temperature controlling scope-110～200 ℃, warm variability＞70 ℃/min, temperature control precision＜± 1 ℃, the range of control 5～95% of humidity, humidity control accuracy＜± 2%.
The compensation decoupling zero controlling schemes of the inventive method during temperature fluctuation, directly adopts the temperature in the bigger chamber of fluctuation to go compensation and adjust humidity as shown in Figure 3; During moisture fluctuation, come the compensation adjustment temperature according to the amount of the amount of injecting water vapor or injection liquid nitrogen.When humidity is regulated, the nitrogen or the water vapor that inject can bring disturbance to the temperature environment in the chamber, nitrogen amount that can obtain injecting by thermodynamics knowledge and casing characteristic etc. or the relation between steam vapour amount and the temperature, thus determine the parameter of temperature compensation controller.In order to improve system response time, obtain the dynamic and static performance of system preferably simultaneously, the temperature master controller has adopted the fuzzy control method of the two sections of bimodulus (P-Fuzzy PID), set a corresponding threshold value earlier, when the difference of the temperature value of the temperature value of the temperature sensor in chamber actual measurement and setting during greater than this threshold value, adopt proportional control, with the demand of the big temperature variability of adaptive system; When the temperature gap that records during less than this threshold value, adopt fuzzy control, to reduce overshoot, reduce the problem of temperature overshot in the big temperature rate process.The controlled quentity controlled variable of temperature master controller and temperature compensation controller output close the temperature controlled quentity controlled variable that the system that is is current.Similarly, under the situation that water capacity is certain in chamber, when temperature is adjusted, can produce bigger influence to the humidity in the chamber, therefore obtain the undulating quantity of temperature by initial temperature value and current real time temperature value, by the characteristic of thermodynamics knowledge and casing etc. can obtain temperature fluctuation to humidity quantitative influence the result, thereby determine the parameter of humidity compensate controller.Owing to lower to the requirement of system's humidity, there is not the demand of rate of change aspect, the demand of control accuracy is not high yet, and the humidity master controller adopts fuzzy control.The controlled quentity controlled variable sum of the controlled quentity controlled variable of humidity master controller output and the output of humidity compensate controller is current humidity controlled quentity controlled variable.Wherein, temperature master controller, temperature compensation controller, humidity master controller, humidity compensate controller all are that programming realizes in Programmable Logic Controller PLC.
Claims (4)
1. a high-temperature variability temperature and humidity environmental test control method is characterized in that in chamber, realizes temperature-rise period with the heating of large power, electrically heating group, injects liquid nitrogen with liquid nitrogen plan and realizes temperature-fall period; Realize humidification with steam generating device, inject liquid nitrogen with liquid nitrogen plan and realize dehumidification process; In the described dehumidification process, liquid nitrogen reinjects behind the heating arrangement heating and dehumidification earlier in the chamber; Temperature sensor and humidity sensor are set in described chamber, real time temperature, humidity data in the detected chamber of temperature sensor and humidity sensor pass to Programmable Logic Controller PLC by signal conversion module, Programmable Logic Controller PLC compares and carry out compensated decoupling and fuzzy control program with its sampled value and setting value: when sample temperature was lower than setting value, Programmable Logic Controller PLC was by the output control large power, electrically heating group heating of digital output port; When sample temperature was higher than setting value, Programmable Logic Controller PLC was by the refrigeration solenoid valve folding on the output control liquid nitrogen plan of digital output port, with control liquid nitrogen injection rate IR in chamber; When sampling humidity was lower than setting value, Programmable Logic Controller PLC was by the humidification solenoid valve folding on the output control water vapor generation device of digital output port, with the injection rate IR of control water vapor in chamber; When the humidity of sampling was higher than setting value, Programmable Logic Controller PLC made humidity reduction in the chamber by the folding of the output control dehumidifying solenoid valve of digital output port with control liquid nitrogen injection rate IR in chamber, and the humiture value in chamber meets the demands.
2. a high-temperature variability temperature and humidity environmental test control device is characterized in that comprising chamber, temperature and humidity control system; Described temperature and humidity control system is made up of Programmable Logic Controller PLC, temperature sensor, humidity sensor, large power, electrically heating group, liquid nitrogen plan, water vapor generation device, fan; Described liquid nitrogen plan is communicated with the chamber inner chamber by refrigerator pipes and dehumidification pipe, steam generating device is communicated with the chamber inner chamber by the humidification pipe, be respectively equipped with refrigeration solenoid valve, dehumidifying solenoid valve and humidification solenoid valve on refrigerator pipes, dehumidification pipe and the humidification pipe, temperature sensor and humidity sensor all are located in the chamber, fan and large power, electrically heating group are located at the top in the chamber, and temperature sensor, humidity sensor, fan, dehumidifying solenoid valve, refrigeration solenoid valve, humidification solenoid valve all are connected with Programmable Logic Controller PLC with large power, electrically heating group.
3. high-temperature variability temperature and humidity environmental test control device according to claim 2, what it is characterized in that being provided with in the described chamber upper and lower opening is used for air-flow round-robin air channel, and described fan and large power, electrically heating group are located in the air channel of chamber inner top.
4. according to claim 2 or 3 described high-temperature variability temperature and humidity environmental test control device, it is characterized in that described dehumidification pipe is provided with heating arrangement.
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| CN2010101582321A CN101813954B (en) | 2010-04-28 | 2010-04-28 | High-temperature variability temperature and humidity environmental test control method and device |
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| CN2010101582321A CN101813954B (en) | 2010-04-28 | 2010-04-28 | High-temperature variability temperature and humidity environmental test control method and device |
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| CN101813954B true CN101813954B (en) | 2011-06-29 |
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| CN102163065A (en) * | 2011-01-21 | 2011-08-24 | 丹纳赫西特传感工业控制（天津）有限公司 | Multi-loop fuzzy coupling temperature and humidity controller suitable for constant temperature and humidity experiment box |
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| SU1002761A1 (en) * | 1981-10-28 | 1983-03-07 | Предприятие П/Я А-3605 | Method of automatic control of temperature mode of gas separation unit nitrogen-water cooling system |
| US20100024440A1 (en) * | 2008-08-04 | 2010-02-04 | John Dain | Flow Control of a Cryogenic Element to Remove Heat |
| CN201361517Y (en) * | 2009-01-20 | 2009-12-16 | 江苏白雪电器股份有限公司 | Nitrogen gas dehumidifying mechanism used for environmental testing machine |
| CN101498527B (en) * | 2009-01-20 | 2010-09-15 | 江苏白雪电器股份有限公司 | Cooling apparatus of environment tester |
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