CN106227276A - High-and-low temperature humid heat test box temperature accuracy-control system and method - Google Patents
High-and-low temperature humid heat test box temperature accuracy-control system and method Download PDFInfo
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- CN106227276A CN106227276A CN201610787996.4A CN201610787996A CN106227276A CN 106227276 A CN106227276 A CN 106227276A CN 201610787996 A CN201610787996 A CN 201610787996A CN 106227276 A CN106227276 A CN 106227276A
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- temperature
- low temperature
- humidity
- humiture
- refrigeration
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention relates to a kind of high-and-low temperature humid heat test box temperature accuracy-control system, including high-low temperature test chamber, including humiture measurement mechanism, Temperature and Humidity Control equipment in high-low temperature test chamber, Temperature and Humidity Control equipment includes refrigerating plant, heating combined equipment, damping device and dehydrating unit；High-low temperature test chamber is outside equipped with temperature and humidity controller, human-computer interaction device；Humiture measurement mechanism, refrigerating plant, heating combined equipment, damping device, dehydrating unit, human-computer interaction device are all connected with temperature and humidity controller；The invention have benefit that and high-and-low temperature humid heat test box humiture is accurately controlled by arranging pid algorithm, measurement result to multiple employing cycles, goal-selling, calculate humiture deviation, it is integrated according to deviation/differentiates, give the output of weight computing Temperature and Humidity Control equipment further according to different humiture change curves, accurately control and suppress humiture to shake.
Description
Technical field
The present invention relates to environmental test chamber, in particular to a kind of high-and-low temperature humid heat test box temperature accuracy-control system and side
Method.
Background technology
High-low-temperature environmental testing equipment is usually used in various material products are carried out environmental adaptability development test.High/low temperature
Environmental test equipment generally controls high-low-temperature environmental testing equipment test temperature by arranging refrigeration plant and heater, makes
This temperature tends to design temperature.
When needs are lowered the temperature to reach target temperature, and high-low-temperature environmental testing equipment semen donors causes examination more than actual demand
When testing temperature close to target temperature, by the way of reducing refrigerating device refrigeration amount simultaneously and opening heating devices heat, make test
Temperature variation curve " brakes " to accurately attain target temperature, and uses above-mentioned this mode too much, can cause equipment energy
Consumption increases, and cost increases.Test the temperature inside the box controls typically can only control in the range of target temperature ± 0.3 degree simultaneously, it is impossible to
Reaching some needs test temperature controlled at ± 0.1 degree to require.
Summary of the invention
The technical problem to be solved is to provide and realizes the high-and-low temperature humid heat test box temperature that accurate temperature controls
Accuracy-control system and method.
The technical scheme is that
A kind of high-and-low temperature humid heat test box temperature accuracy-control system, including high-low temperature test chamber, described thermocycling
Include in case that humiture measurement mechanism, Temperature and Humidity Control equipment, described Temperature and Humidity Control equipment include refrigerating plant, heat dress
Put, damping device and dehydrating unit；Described high-low temperature test chamber is outside equipped with temperature and humidity controller, human-computer interaction device；Described
Humiture measurement mechanism, described refrigerating plant, described heating combined equipment, described damping device, described dehydrating unit, described man-machine friendship
Device is all connected with described temperature and humidity controller mutually；
Described heating combined equipment is used for as environment heat supply in described high-low temperature test chamber；
Described refrigerating plant is used for as environment cooling in described high-low temperature test chamber；
Described humiture measurement mechanism is used for monitoring temperature in described high-low temperature test chamber, and sends measurement result to described
Temperature and humidity controller；
Described human-computer interaction device is for setting the target temperature of environment, target humidity in described high-low temperature test chamber；
Described temperature and humidity controller controls for the temperature and humidity measurement value measured according to humiture measurement mechanism and desired value
Described refrigerating plant, described heating combined equipment, described damping device, the output of described dehydrating unit.
Further, described refrigerating plant is cascade refrigeration device or single-stage refrigeration device, deep according to different refrigeration
Degree demand selects different refrigerating plants, generally selects cascade refrigeration dress when needing the refrigeration demand carrying out less than-30 DEG C
Put.
When described refrigerating plant is chosen as cascade refrigeration device；Described refrigerating plant include cryogenic refrigeration cyclic part and
High-temperature refrigeration cyclic part；Vaporizer that described cryogenic refrigeration cyclic part includes being sequentially connected in series, cryogenic compressor, evaporative condenser
Device, cryogenic throttle valve；Described evaporative condenser that described high-temperature refrigeration cyclic part includes being sequentially connected in series, high temperature compressor, cold
Condenser and high temperature choke valve.
Preferably, cryogenic refrigeration cyclic part described in described cascade refrigeration device uses R23 as refrigeration
Agent；Described high-temperature refrigeration cyclic part uses R404A as cold-producing medium.
Further, described human-computer interaction device includes touch-screen type display device.
Present invention also offers a kind of method using above-mentioned high-and-low temperature humid heat test box temperature accuracy-control system:
Described human-computer interaction device arranges and controls described refrigerating plant, the output work of described heating combined equipment by pid algorithm
Rate:
S1, proof box target temperature and sampling period are set；
S2, according to the real time temperature/humidity in sampling period experiment with measuring case, and calculate real time temperature/humidity and target
The deviation of temperature/humidity；
S3, sampling period calculated deviations all in S2 are integrated computing, it is thus achieved that result of calculation；
S4, give, to the operation result of S3, the output that weights P obtains described Temperature and Humidity Control equipment.
The invention have benefit that and realized the essence of cryogenic temperature in high-and-low temperature humid heat test box by PLC
Really control: 1 to stablize overswing ratio less；2. fluctuation is smaller；3. the time reaching stable is short；4. add refrigeration heat alternately to open, have
Energy-saving effect, has brought up to ± 0.1 DEG C by conventional temperature control precision from ± 0.3 DEG C of degree.
Accompanying drawing explanation
Fig. 1 is the functional schematic of high-and-low temperature humid heat test box temperature accuracy-control system of the present invention；
Fig. 2 is refrigerating device structure schematic diagram in the present invention.
Detailed description of the invention
Being described principle and the feature of the present invention below in conjunction with accompanying drawing, example is served only for explaining the present invention, and
Non-for limiting the scope of the present invention.
As shown in Figure 1, a kind of high-and-low temperature humid heat test box temperature accuracy-control system, it is characterised in that: include height
Temperature test box, includes humiture measurement mechanism, Temperature and Humidity Control equipment in high-low temperature test chamber, Temperature and Humidity Control equipment includes system
Device for cooling, heating combined equipment, damping device and dehydrating unit；High-low temperature test chamber is outside equipped with temperature and humidity controller, man-machine interaction
Device；Humiture measurement mechanism, refrigerating plant, heating combined equipment, damping device, dehydrating unit, human-computer interaction device are all with warm and humid
Degree controller is connected.
Heating combined equipment is used for as environment heat supply in high-low temperature test chamber.
Refrigerating plant is used for as environment cooling in high-low temperature test chamber.
Humiture measurement mechanism is used for monitoring temperature in high-low temperature test chamber, and sends measurement result to Temperature and Humidity Control
Device.
Human-computer interaction device is for setting the target temperature of environment, target humidity in high-low temperature test chamber.
Temperature and humidity controller controls refrigeration for the temperature and humidity measurement value measured according to humiture measurement mechanism and desired value
Device, heating combined equipment, damping device, the output of dehydrating unit.
Refrigerating plant is cascade refrigeration device or single-stage refrigeration device.
Refrigerating plant is cascade refrigeration device；Refrigerating plant includes cryogenic refrigeration cyclic part and high-temperature refrigeration circulation portions
Point；
As shown in Figure 2, cryogenic refrigeration cyclic part includes being sequentially connected in series vaporizer, cryogenic compressor, evaporative condenser
Device, cryogenic throttle valve；High-temperature refrigeration cyclic part includes evaporative condenser, high temperature compressor, condenser and the height being sequentially connected in series
Temperature choke valve.High temperature refrigerant enters condenser from high temperature compressor, within the condenser after heat radiation, enters high temperature choke valve, pressure
Power reduces, and cold-producing medium is become gaseous state from liquid, enters condenser/evaporator vaporization heat absorption；Absorb and enter condensation from cryogenic compressor
The heat of the low-temperature refrigerant of vaporizer, makes low-temperature refrigerant temperature quickly reduce, by low-temperature refrigerant after cryogenic throttle valve
Pressure reduces, and low-temperature refrigerant Low Temperature Liquid enters the heat absorption of vaporizer fast vaporizing in gaseous form and reaches the purpose of cooling.
In preferred version, in cascade refrigeration device, cryogenic refrigeration cyclic part uses R23 as cold-producing medium；High-temperature refrigeration
Cyclic part uses R404A as cold-producing medium.
Human-computer interaction device includes touch-screen type display device.
In production activity, human-computer interaction device arranges and controls refrigerating plant, the output work of heating combined equipment by pid algorithm
Rate:
S1, proof box target temperature and sampling period are set；
S2, according to the real time temperature/humidity in sampling period experiment with measuring case, and calculate real time temperature/humidity and target
The deviation of temperature/humidity；
S3, sampling period calculated deviations all in S2 are integrated computing, it is thus achieved that result of calculation；
S4, give, to the operation result of S3, the output that weights P obtains Temperature and Humidity Control equipment.
In concrete operations, the setting to weights P can be in the following way:
1) proper integral, integral coefficient is 1.
When PID module starts to calculate, its integration begins to ceaselessly add up, and PID module can be adopted according to the intrinsic of setting
The collection setting value of sample cycle timing and the deviation of instantaneous value, when instantaneous value is more than setting value, deviation is negative, otherwise, partially
Difference is positive number.It is no matter negative or positive number principal value of integral all can ceaselessly add up, when instantaneous value is lower than setting value when, long-pending
Score value will up add up, otherwise, integrated value can down add up.Here it is so-called proper integral, PID constant when just
It is to realize balance by the change of proper integral mixing ratio coefficient simultaneously.
2) trapezoidal surge integration, the size of integral coefficient depends on two interval values of A and B, (optional humiture change
During first sampling period and current sample period interval as A, B).
When instantaneous value becomes closer in setting value less than setting value and instantaneous value when, ratio P value is gradually to subtract
Little, if the speed that the speed of score accumulation in this time reduces less than ratio value, the output valve of PID can subtract rapidly
Little, the output that indirectly can cause PID is not enough, thus affects instantaneous value and arrive the speed of setting value, introduces trapezoidal this time
Integration, is the effect in order to increase integration, and integral coefficient constantly can reduce along with setting value and the overgauge of instantaneous value and linear
It is incremented by.
3) the trapezoidal integration that successively decreases, the same with trapezoidal surge integration, the size of integral coefficient is also dependent on A and B Liang Ge district
Between value.
When instantaneous value more than setting value and instantaneous value more and more far away from the when of in setting value, program has judgement,
During if the deviation from the speed excessively rushed quickly, will use the pattern of the trapezoidal integration that successively decreases, this time, ratio P value was for negative value
, according to above-mentioned, this time, score accumulation back added up, if integration in this time does not give power, that
Deviation between instantaneous value and setting value can be increasing, namely crosses punching and gets more and more, introduces trapezoidal successively decreasing this time
Integration, it is therefore an objective to increase integral coefficient when crossing and rushing, allow the integrated value of PID the most back add up, to avoid punching too many, integration
Coefficient constantly can reduce and linear decrease along with the minus deviation of actual value Yu setting value.
4) amplifying the integration that successively decreases, this time, the cumulative basis of integration was not by integral coefficient, but by amplification coefficient.This
Value=the setting value of score accumulation and the deviation * amplification coefficient of instantaneous value time individual.It is the most that deviation is successively decreased the most greatly, with ladder above
The shape integration that successively decreases is the same, and this integral mode also occurred from the pattern of punching, has served as after punching is inhibited, if it find that also
When being the most excessively to rush, make integrated value with the decrease of speed higher than normal scores accumulated by amplification coefficient this time.
5) amplifying incremental integration, with amplifying, the integration that successively decreases is the same, and this time, the cumulative basis of integration was also by amplifying system
Number.This integral mode occurred in punching and was inhibited, but instantaneous value goes to again the situation of below setting value, in order to prevent it
Falling after rise rapidly, normal score accumulation in this time has had little time also not stop falling, just uses amplification to be incremented by integration, allows
Integrated value each time increases, thus withstands the falling of instantaneous value.
6) anti-saturation integration, when integration is saturated when, integral coefficient is 0.
When ratio P value is more than 100, may determine that the deviation of instantaneous value and setting value is the biggest this time, as
When really deviation is the biggest, it is the biggest with value that integration adds up every time, then problem is come, when needs integration suppresses
Wait, it is found that integration is not because add up before has repaiied to return too much, here it is so-called saturated integration.The most how
Anti-saturation, it is simply that when P value is more than 100, it is not necessary to the PID output valve in this time accumulative of integration is also greater than 100,
So this time integration being forced to zero.
It is poor that all the applying to of 6 kinds of integral operationes eliminates more than humiture.Also can carry out differentiating and suppress the concussion of humiture.
Sampling period all can gather the deviation of lower setting value and actual value every time, such as the deviation gathered for the first time is referred to as " upper last time "
Deviation, the deviation that second time gathers is referred to as " last time " deviation, and the deviation that third time gathers then is referred to as " this " deviation.So so-called
Differential deviation then=(" this " deviation " last time " deviation) (" last time " deviation " upper last time " deviation).By above formula
It can be seen that, when instantaneous value is less than setting value and instantaneous value constantly close to setting value when, the deviation of differential
For negative, otherwise in like manner, the deviation of differential is positive number.The value of differential D is exactly the deviation * differential coefficient of differential.Work as differential
When deviation is negative, then differential D value is also negative, otherwise, when differential deviation is positive number, then differential D value is also positive number.
As can be seen here, differential D is a double-edged sword, when for negative, then can effectively play inhibitory action, otherwise, not only can not press down
System is done a disservice on the contrary and was produced the burden of punching increase integration.Thus, how the effect of differential depends entirely on differential coefficient, when
Differential coefficient is too small, does not has the effect suppressing punching, when differential coefficient is excessive, then can produce concussion.Herein for preventing from producing
Raw concussion, we introduce second differential parameter (this parameter is between 0-1), allow this subdifferential D value be multiplied by this differential parameter
The differential D value sampled when then adding last sampling is multiplied by (1 differential parameter).So can as much as possible prevent
Only can also suppress punching while differential concussion.
High-and-low temperature humid heat test box humiture is accurately controlled by the present invention by pid algorithm, uses week to multiple
The measurement real-time results of phase, goal-selling, calculate humiture deviation record, be integrated according to deviation/differentiate；Root again
According to different humiture change curves, integral/derivative operation result is multiplied by the output work of weight computing Temperature and Humidity Control equipment
Rate, accurately controls and suppresses humiture to shake.
These are only presently preferred embodiments of the present invention, not in order to limit the present invention, all in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (6)
1. a high-and-low temperature humid heat test box temperature accuracy-control system, it is characterised in that: include high-low temperature test chamber, described height
Include in low-temperature test chamber humiture measurement mechanism, Temperature and Humidity Control equipment, described Temperature and Humidity Control equipment include refrigerating plant,
Heating combined equipment, damping device and dehydrating unit；Described high-low temperature test chamber is outside equipped with temperature and humidity controller, man-machine interaction dress
Put；Described humiture measurement mechanism, described refrigerating plant, described heating combined equipment, described damping device, described dehydrating unit, institute
State human-computer interaction device to be all connected with described temperature and humidity controller；
Described heating combined equipment is used for as environment heat supply in described high-low temperature test chamber；
Described refrigerating plant is used for as environment cooling in described high-low temperature test chamber；
Described humiture measurement mechanism is used for monitoring temperature in described high-low temperature test chamber, and sends measurement result to described warm and humid
Degree controller；
Described human-computer interaction device is for setting the target temperature of environment, target humidity in described high-low temperature test chamber；
Described temperature and humidity controller controls described for the temperature and humidity measurement value measured according to humiture measurement mechanism and desired value
Refrigerating plant, described heating combined equipment, described damping device, the output of described dehydrating unit.
High-and-low temperature humid heat test box temperature accuracy-control system the most according to claim 1, it is characterised in that: described refrigeration
Device is cascade refrigeration device or single-stage refrigeration device.
High-and-low temperature humid heat test box temperature accuracy-control system the most according to claim 2, it is characterised in that: described refrigeration
Device is cascade refrigeration device；Described refrigerating plant includes cryogenic refrigeration cyclic part and high-temperature refrigeration cyclic part；
Described cryogenic refrigeration cyclic part includes that the vaporizer being sequentially connected in series, cryogenic compressor, evaporative condenser, low temperature throttle
Valve；
Described high-temperature refrigeration cyclic part includes described evaporative condenser, high temperature compressor, condenser and the high temperature being sequentially connected in series
Choke valve.
High-and-low temperature humid heat test box temperature accuracy-control system the most according to claim 3, it is characterised in that: described low temperature
Kind of refrigeration cycle part uses R23 as cold-producing medium；Described high-temperature refrigeration cyclic part uses R404A as cold-producing medium.
5. according to the arbitrary described high-and-low temperature humid heat test box temperature accuracy-control system of claim 1-4, it is characterised in that: institute
State human-computer interaction device and include touch-screen type display device.
6. the method for application high-and-low temperature humid heat test box temperature accuracy-control system described in claim 1, it is characterised in that:
Described human-computer interaction device arranges and controls described refrigerating plant, the output of described heating combined equipment by pid algorithm:
S1, proof box target temperature and sampling period are set；
S2, according to the real time temperature/humidity in sampling period experiment with measuring case, and calculate real time temperature/humidity and target temperature/
The deviation of humidity；
S3, sampling period calculated deviations all in S2 are integrated computing, it is thus achieved that result of calculation；
S4, give, to the operation result of S3, the output that weights P obtains described Temperature and Humidity Control equipment.
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Cited By (10)
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| CN109596246A (en) * | 2018-12-07 | 2019-04-09 | 姚佳爱 | A kind of method of temperature shock test quality control |
| CN109765948A (en) * | 2019-03-11 | 2019-05-17 | 中山市明峰医疗器械有限公司 | Non-overshoot temperature control algorithm for CT detector |
| CN109959178A (en) * | 2019-03-27 | 2019-07-02 | 中国北方车辆研究所 | Simulated environment cabin pole cryogenic refrigerating unit |
| CN110196553A (en) * | 2019-06-05 | 2019-09-03 | 江苏拓米洛环境试验设备有限公司 | Chamber with dynamic heat load runs control method and device when high temperature and humidity |
| CN110410996A (en) * | 2019-07-19 | 2019-11-05 | 宁波东邦电器有限公司 | It is a kind of using humidity valley as controlled variable compressor dehumidify position formula constant humidity control method |
| CN110427059A (en) * | 2019-07-23 | 2019-11-08 | 江苏拓米洛环境试验设备有限公司 | The method for testing temperature and humidity and device of moisture-heat test-box |
| CN113862728A (en) * | 2021-09-30 | 2021-12-31 | 佛山仙湖实验室 | Pressure control method, system, equipment and medium for PEM pure water electrolysis hydrogen production |
| CN114326876A (en) * | 2021-12-17 | 2022-04-12 | 宁夏嘉地酒园酒庄有限公司 | Cellar environment self-adjusting intelligent system |
| CN115469700A (en) * | 2022-09-19 | 2022-12-13 | 江苏拓米洛环境试验设备有限公司 | Temperature and humidity control method and device for test box |
| CN116203342A (en) * | 2023-04-27 | 2023-06-02 | 成都中航华测科技有限公司 | Temperature control method for device testing process based on high-low temperature experiment box |
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| CN113862728A (en) * | 2021-09-30 | 2021-12-31 | 佛山仙湖实验室 | Pressure control method, system, equipment and medium for PEM pure water electrolysis hydrogen production |
| CN113862728B (en) * | 2021-09-30 | 2024-01-09 | 佛山仙湖实验室 | Pressure control method, system, equipment and medium for PEM pure water electrolysis hydrogen production |
| CN114326876A (en) * | 2021-12-17 | 2022-04-12 | 宁夏嘉地酒园酒庄有限公司 | Cellar environment self-adjusting intelligent system |
| CN115469700A (en) * | 2022-09-19 | 2022-12-13 | 江苏拓米洛环境试验设备有限公司 | Temperature and humidity control method and device for test box |
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| CN116203342A (en) * | 2023-04-27 | 2023-06-02 | 成都中航华测科技有限公司 | Temperature control method for device testing process based on high-low temperature experiment box |
| CN116203342B (en) * | 2023-04-27 | 2023-07-07 | 成都中航华测科技有限公司 | Temperature control method for device testing process based on high-low temperature experiment box |
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