CN115951731A - Temperature smooth control method of environmental test chamber with electronic expansion valve - Google Patents
Temperature smooth control method of environmental test chamber with electronic expansion valve Download PDFInfo
- Publication number
- CN115951731A CN115951731A CN202211569502.7A CN202211569502A CN115951731A CN 115951731 A CN115951731 A CN 115951731A CN 202211569502 A CN202211569502 A CN 202211569502A CN 115951731 A CN115951731 A CN 115951731A
- Authority
- CN
- China
- Prior art keywords
- expansion valve
- electronic expansion
- opening
- target
- output quantity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 51
- 230000007613 environmental effect Effects 0.000 title claims abstract description 35
- 238000012360 testing method Methods 0.000 title claims abstract description 35
- 238000009499 grossing Methods 0.000 description 15
- 238000005057 refrigeration Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 239000003507 refrigerant Substances 0.000 description 6
- 238000005070 sampling Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- YBGRCYCEEDOTDH-JYNQXTMKSA-N evap protocol Chemical compound O=C1C=C[C@]2(C)[C@H]3[C@@H](O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1.O([C@H]1C[C@@](O)(CC=2C(O)=C3C(=O)C=4C=CC=C(C=4C(=O)C3=C(O)C=21)OC)C(=O)CO)[C@H]1C[C@H](N)[C@H](O)[C@H](C)O1.COC1=C(O)C(OC)=CC([C@@H]2C3=CC=4OCOC=4C=C3C(O[C@H]3[C@@H]([C@@H](O)[C@@H]4O[C@H](C)OC[C@H]4O3)O)[C@@H]3[C@@H]2C(OC3)=O)=C1.C([C@H](C[C@]1(C(=O)OC)C=2C(=C3C([C@]45[C@H]([C@@]([C@H](OC(C)=O)[C@]6(CC)C=CCN([C@H]56)CC4)(O)C(=O)OC)N3C)=CC=2)OC)C[C@@](C2)(O)CC)N2CCC2=C1NC1=CC=CC=C21 YBGRCYCEEDOTDH-JYNQXTMKSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 108010077333 CAP1-6D Proteins 0.000 description 1
- 101100494448 Caenorhabditis elegans cab-1 gene Proteins 0.000 description 1
- 102100027284 Fanconi-associated nuclease 1 Human genes 0.000 description 1
- 101000897856 Homo sapiens Adenylyl cyclase-associated protein 2 Proteins 0.000 description 1
- 101000914689 Homo sapiens Fanconi-associated nuclease 1 Proteins 0.000 description 1
- 101000836079 Homo sapiens Serpin B8 Proteins 0.000 description 1
- 101000836075 Homo sapiens Serpin B9 Proteins 0.000 description 1
- 101000661807 Homo sapiens Suppressor of tumorigenicity 14 protein Proteins 0.000 description 1
- 101000798702 Homo sapiens Transmembrane protease serine 4 Proteins 0.000 description 1
- 102100029500 Prostasin Human genes 0.000 description 1
- 102100037942 Suppressor of tumorigenicity 14 protein Human genes 0.000 description 1
- 102100032471 Transmembrane protease serine 4 Human genes 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 108010031970 prostasin Proteins 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a temperature smooth control method of an environmental test chamber with an electronic expansion valve. Whether the opening degree of the electronic expansion valve needs to be adjusted or not can be automatically judged by judging whether the opening degree output timer of the electronic expansion valve is larger than or equal to the target adjustment period of the opening degree output quantity or not. When the opening degree of the electronic expansion valve is automatically judged to be required to be adjusted, the opening degree of the electronic expansion valve is not directly switched to the set target opening degree, but the target opening degree subprogram of the electronic expansion valve is called, and the opening degree output quantity of the controller is adjusted according to the target opening degree subprogram so as to adjust the opening degree of the electronic expansion valve. Compared with the prior art, whether the opening degree of the electronic expansion valve needs to be adjusted or not can be automatically judged, and the opening degree is adjusted by calling a target opening degree subprogram when the opening degree needs to be adjusted, so that the problems of flow difference caused before and after the opening degree of the electronic expansion valve is switched and unsmooth temperature of a temperature control room caused by the flow difference are solved, and the running stability of a system is improved.
Description
Technical Field
The invention relates to the technical field of environmental test equipment, in particular to a temperature smooth control method of an environmental test chamber with an electronic expansion valve.
Background
The electronic expansion valve is a refrigerant flow regulating device driven by a stepping motor, and the device controls the movement of a valve needle driven by internal valve rod threads by providing logic digital signals for the stepping motor, thereby realizing the control of the flow and the area of the valve. Especially in some occasions with severe load change, high temperature control precision or wide operation working condition range, such as an environmental test chamber, the traditional throttling element (such as a capillary tube, a thermal expansion valve and the like) can not meet the requirements of temperature control precision and energy conservation, so that the electronic expansion valve is more and more widely applied.
However, when the electronic expansion valve needs to adjust the opening degree, the electronic expansion valve is controlled to directly switch to the set target opening degree for operation no matter what the opening degree of the electronic expansion valve is currently opened, and such a mode easily causes large flow difference before and after the opening degree of the electronic expansion valve is switched, and affects the stability of system operation, thereby causing the unsmooth phenomenon of a temperature curve of a room between temperature control.
Disclosure of Invention
The invention provides a temperature smooth control method of an environmental test chamber with an electronic expansion valve, which is used for reducing the difference of flow before and after the opening of the electronic expansion valve is switched, realizing smooth temperature switching and improving the stability of system operation.
According to an aspect of the present invention, there is provided a temperature smoothing control method of an environmental test chamber having an electronic expansion valve, the method including:
setting an opening output timer of the electronic expansion valve; acquiring a target adjustment period of the opening output quantity of the electronic expansion valve according to a preset adjustment period calculation criterion;
judging whether an opening output timer of the electronic expansion valve is larger than or equal to a target adjustment period of the opening output quantity or not;
if so, calling a target opening subprogram of the electronic expansion valve, and adjusting the opening output quantity of the controller according to the target opening subprogram.
Optionally, the adjusting the opening output quantity of the controller according to the target opening subroutine includes:
acquiring the actual opening of the electronic expansion valve, acquiring the opening deviation of the electronic expansion valve, and acquiring the adjustment step length of the opening output quantity of the electronic expansion valve according to a preset adjustment step length calculation criterion;
judging whether the opening deviation of the electronic expansion valve is equal to zero or not; and if not, adjusting the opening output quantity of the controller according to the actual opening of the electronic expansion valve and the adjustment step length of the opening output quantity.
Optionally, if not, adjusting an opening output quantity of a controller according to the actual opening of the electronic expansion valve and an adjustment step length of the opening output quantity, includes:
if the opening deviation of the electronic expansion valve is not equal to zero, further judging whether the opening deviation of the electronic expansion valve is larger than zero;
if so, adjusting the opening output quantity of the controller according to the sum of the actual opening of the electronic expansion valve and the adjustment step length of the opening output quantity;
if not, the opening degree output quantity of the controller is adjusted according to the difference between the actual opening degree of the electronic expansion valve and the adjustment step length of the opening degree output quantity.
Optionally, the preset adjustment step calculation criterion has a calculation formula as follows:
wherein, DEEVcabi _ refj _ k _ err (k) is the adjustment step of the opening output quantity, and DEEVcabi _ refj _ k _ err (k) is the opening deviation of the electronic expansion valve.
Optionally, the acquiring an opening degree deviation of the electronic expansion valve includes:
acquiring a target opening degree of the electronic expansion valve;
and acquiring the opening deviation of the electronic expansion valve according to the difference between the target opening of the electronic expansion valve and the actual opening of the electronic expansion valve.
Optionally, the preset adjustment period calculation criterion includes:
acquiring the opening deviation of the electronic expansion valve and a temperature balance mark position of a temperature control chamber;
and determining a target adjustment period of the opening output quantity of the electronic expansion valve according to the opening deviation of the electronic expansion valve and the temperature balance mark bit of the temperature control chamber.
Optionally, the determining a target adjustment period of the opening output quantity of the electronic expansion valve according to the opening deviation of the electronic expansion valve and the temperature balance flag of the temperature control chamber includes:
when the temperature balance flag bit of the temperature control chamber is equal to zero, calculating a target adjustment period of the opening output quantity of the electronic expansion valve according to a first preset formula;
and when the temperature balance flag bit of the temperature control chamber is equal to one, calculating a target adjustment period of the opening output quantity of the electronic expansion valve according to a second preset formula.
Optionally, the first preset formula is:
τEEVcabi_refj_k_target(k)
wherein τ EEVcabi _ refj _ k _ target (k) is a target adjustment period of the opening degree output quantity of the electronic expansion valve, and DEEVcabi _ refj _ k _ err (k) is an opening degree deviation of the electronic expansion valve.
Optionally, the second preset formula is:
τEEVcabi_refj_k_target(k)
wherein τ EEVcabi _ refj _ k _ target (k) is a target adjustment period of an opening output amount of the electronic expansion valve, and DEEVcabi _ refj _ k _ err (k) is an opening deviation of the electronic expansion valve.
Optionally, after adjusting the opening output quantity of the controller according to the target opening subroutine, the method further includes: and recording the opening output quantity of the controller, and resetting an opening output timer of the electronic expansion valve.
The technical scheme of the embodiment of the invention provides a temperature smooth control method of an environmental test chamber with an electronic expansion valve, which comprises the following steps: setting an opening output timer of the electronic expansion valve; acquiring a target adjustment period of the opening output quantity of the electronic expansion valve according to a preset adjustment period calculation criterion; judging whether an opening output timer of the electronic expansion valve is greater than or equal to a target adjustment period of the opening output quantity or not; if so, calling a target opening subprogram of the electronic expansion valve, and adjusting the opening output quantity of the controller according to the target opening subprogram. Therefore, the method can realize that: whether the opening degree of the electronic expansion valve needs to be adjusted or not can be automatically judged by judging whether the opening degree output timer of the electronic expansion valve is larger than or equal to the target adjustment period of the opening degree output quantity or not. When the opening degree of the electronic expansion valve is automatically judged to be required to be adjusted, the opening degree of the electronic expansion valve is adjusted by calling a target opening degree subprogram of the electronic expansion valve and adjusting the opening degree output quantity of the controller according to the target opening degree subprogram instead of directly switching the opening degree to a set target opening degree. Compared with the mode of directly switching to the set target opening for operation when the opening needs to be adjusted in the prior art, the method can automatically judge whether the opening of the electronic expansion valve needs to be adjusted or not, and adjust the opening by calling the target opening subprogram when the opening needs to be adjusted, so that the flow difference of the electronic expansion valve caused before and after the opening is switched and the problem of unsmooth temperature of a temperature control room caused by the unsmooth opening of the electronic expansion valve can be reduced, the automatic control degree of the opening adjustment of the electronic expansion valve is improved, and the stability of the system operation is improved.
It should be understood that the statements in this section are not intended to identify key or critical features of the embodiments of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating the unsmooth temperature profile caused by a conventional control strategy in the prior art;
FIG. 2 is a schematic structural diagram of a refrigeration system of an environmental test chamber provided in an embodiment of the present invention;
FIG. 3 is a flow chart of a method for controlling temperature smoothing in an environmental test chamber having an electronic expansion valve according to an embodiment of the present invention;
FIG. 4 is a flow chart of another method for controlling temperature smoothing in an environmental test chamber having an electronic expansion valve according to an embodiment of the present invention;
FIG. 5 is a flow chart of another method for controlling temperature smoothing in an environmental test chamber having an electronic expansion valve according to an embodiment of the present invention;
FIG. 6 is a schematic control flow chart of a method for controlling temperature smoothing of an environmental test chamber with an electronic expansion valve according to an embodiment of the present invention;
fig. 7 is a comparison diagram illustrating the effect of temperature smoothing control provided in the embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The inventor researches and discovers that the electronic expansion valve is a refrigerant flow regulating device driven by a stepping motor, and the device controls the movement of an internal valve rod screw thread driving valve needle by providing logic digital signals for the stepping motor, thereby realizing the control of the valve flow and the valve area. Especially in some situations, such as environmental test chambers, where the load changes severely, the temperature control accuracy is high, or the operating condition range is wide, the conventional throttling elements (such as capillary tubes, thermostatic expansion valves, etc.) cannot meet the requirements of temperature control accuracy and energy conservation, so that the electronic expansion valves are more and more widely applied.
However, when the opening degree of the electronic expansion valve needs to be adjusted, the electronic expansion valve is controlled to directly switch to the set target opening degree for operation no matter what the opening degree of the electronic expansion valve is currently opened, and the mode easily causes that the flow difference before and after the opening degree of the electronic expansion valve is switched is large, thereby affecting the stability of system operation, and further causing the unsmooth phenomenon of a temperature curve of a temperature control room. Fig. 1 is a schematic diagram illustrating a temperature curve unevenness phenomenon caused by a conventional control strategy in the prior art. Fig. 1 shows a phenomenon of temperature unevenness caused by a difference in flow rate before and after switching of the opening of the electronic expansion valve.
Therefore, the embodiment of the invention provides a temperature smooth control method for an environmental test chamber with an electronic expansion valve, so as to reduce the difference of flow before and after the opening degree of the electronic expansion valve is switched, realize smooth temperature switching and improve the stability of system operation.
Fig. 2 is a schematic structural diagram of a refrigeration system of the environmental test chamber provided in the embodiment of the invention. The environmental test chamber consists of a chamber body, a control system and a refrigerating system. The box body is mainly made of heat insulation materials, and the temperature of the compartment can be adjusted at will within a specified range. The control system is composed of a touch screen, a PLC, a temperature sensor, a pressure sensor and a relevant expansion module. Referring to fig. 2, the refrigeration system is mainly composed of a compressor, a condenser, an evaporator, an Electronic Expansion Valve (EEV), a heater, a condensing fan, a circulating fan, an electromagnetic valve, a capillary tube, and the like. The principle of the refrigeration system is shown in fig. 2, and the temperature reduction process is as follows: high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor COMP enters the condenser COND to be condensed and then becomes liquid refrigerant, the liquid refrigerant is throttled and decompressed to the inlet of the evaporator EVAP through the electronic expansion valve EEV, and the liquid refrigerant is gasified and absorbs heat in the evaporator EVAP for refrigeration. The system is provided with a heater HT, and when the room temperature approaches to the target temperature, PID control of the heater HT is started to carry out heat load hedging adjustment so as to realize accurate temperature control in the box. Under the refrigeration state, the electronic expansion valve EEV can dynamically adjust the opening according to the superheat degree of the outlet of the evaporator. When the external load is small, the superheat degree of the outlet of the evaporator is reduced, and the operation working condition of low refrigeration output or even zero refrigeration output of the refrigeration system can appear, so that a hot gas bypass loop is formed by combining the hot gas bypass electromagnetic valves SV1 and SV2 and the hot gas bypass capillaries CAP1 and CAP2 to unload the energy of the refrigeration system and maintain the lowest suction pressure of the system. The cold air bypass solenoid valve SV3 and the cold air bypass capillary tube CAP3 are combined into a cold air bypass loop, and the cold air bypass loop has the function of maintaining reasonable air suction temperature of the compressor and avoiding overheating of air suction of the compressor. Referring to fig. 2, the refrigeration system further includes a condensing FAN1, a circulation FAN2, an ambient temperature sensor ST1, an evaporator outlet temperature sensor ST2, a compartment temperature sensor ST3, and an evaporator outlet pressure sensor SP.
Fig. 3 is a flowchart of a temperature smoothing control method for an environmental test chamber with an electronic expansion valve according to an embodiment of the present invention, which is applicable to a situation where a difference in flow before and after switching of an opening degree of the electronic expansion valve is reduced in an opening degree control process of the electronic expansion valve to achieve smooth temperature switching. As shown in fig. 3, the method includes:
and S110, setting an opening output timer of the electronic expansion valve.
The opening output timer of the electronic expansion valve is used for counting the actual period value of the electronic expansion valve in real time under the current sampling period.
And S120, acquiring a target adjustment period of the opening output quantity of the electronic expansion valve according to a preset adjustment period calculation criterion.
Wherein, the target adjusting period of the opening output quantity of the electronic expansion valve is the opening adjusting theoretical period value of the electronic expansion valve.
And S130, judging whether the opening output timer of the electronic expansion valve is larger than or equal to the target adjusting period of the opening output quantity.
And judging whether the opening degree of the electronic expansion valve needs to be adjusted or not by judging whether the opening degree output timer of the electronic expansion valve is larger than or equal to the target adjustment period of the opening degree output quantity or not.
And S140, if so, calling a target opening subprogram of the electronic expansion valve, and adjusting the opening output quantity of the controller according to the target opening subprogram.
The target opening degree subroutine is used for adjusting the opening degree output quantity of the controller so as to adjust the opening degree of the electronic expansion valve.
Specifically, if the opening output timer of the electronic expansion valve is greater than or equal to the target adjustment period of the opening output quantity, it indicates that the opening of the electronic expansion valve needs to be adjusted. Therefore, the opening degree of the electronic expansion valve is adjusted by calling a target opening degree subroutine of the electronic expansion valve and adjusting the opening degree output quantity of the controller according to the target opening degree subroutine. Compared with the mode of directly switching to the set target opening for operation when the opening needs to be adjusted in the prior art, the method can automatically judge whether the opening of the electronic expansion valve needs to be adjusted or not, and adjust the opening by calling the target opening subprogram when the opening needs to be adjusted, so that the flow difference of the electronic expansion valve caused before and after the opening is switched and the problem of unsmooth temperature of a temperature control room caused by the difference can be reduced, the automatic control degree of the opening adjustment of the electronic expansion valve is improved, and the stability of the system operation is improved.
In the technical solution of this embodiment, the operating principle of the temperature smoothing control method for the environmental test chamber with the electronic expansion valve is as follows: first, an opening output timer of the electronic expansion valve is set. Then, acquiring a target adjustment period of the opening output quantity of the electronic expansion valve according to a preset adjustment period calculation criterion; judging whether an opening output timer of the electronic expansion valve is larger than or equal to a target adjustment period of the opening output quantity or not; if yes, calling a target opening subprogram of the electronic expansion valve, and adjusting the opening output quantity of the controller according to the target opening subprogram. Therefore, whether the opening degree of the electronic expansion valve needs to be adjusted can be automatically judged by judging whether the opening degree output timer of the electronic expansion valve is larger than or equal to the target adjustment period of the opening degree output quantity. When the opening degree of the electronic expansion valve is automatically judged to be required to be adjusted, the opening degree of the electronic expansion valve is adjusted by calling a target opening degree subprogram of the electronic expansion valve and adjusting the opening degree output quantity of the controller according to the target opening degree subprogram instead of directly switching the opening degree to a set target opening degree. Compared with the mode of directly switching to the set target opening for operation when the opening needs to be adjusted in the prior art, the method can automatically judge whether the opening of the electronic expansion valve needs to be adjusted or not, and adjust the opening by calling the target opening subprogram when the opening needs to be adjusted, so that the flow difference of the electronic expansion valve caused before and after the opening is switched and the problem of unsmooth temperature of a temperature control room caused by the difference can be reduced, the automatic control degree of the opening adjustment of the electronic expansion valve is improved, and the stability of the system operation is improved.
It should be noted that the above-mentioned embodiment (and the following embodiments) is described by taking an example of one of the electronic expansion valves in the environmental test chamber, and if the environmental test chamber has a plurality of Electronic Expansion Valves (EEVs), the environmental test chamber may be divided by using a number, and suffixes or subscripts are defined as follows:
wherein, EEV is: the controlled object is an electronic expansion valve;
cabi is: the number of the compartments to which the controlled object belongs (all compartments of the whole machine are cab0; one or more compartments are numbered cab1, cab2 and … cabn from top to bottom and from left to right in sequence);
refj is: the number of the refrigeration system to which the controlled object belongs (the single-path system is ref0, the small compressor system in the double system is ref1, the large compressor system in the double system is ref2, the high temperature system in the cascade system is ref1', and the low temperature system in the cascade system is ref 2');
k is: the controlled object numbers (the numbers are 1,2 and … n in sequence according to the number of controlled objects).
Exemplary, the EEV numbering definitions are set forth in Table 1.
Table 1EEV number definition example
Fig. 4 is a flowchart of another temperature smoothing control method for an environmental test chamber with an electronic expansion valve according to an embodiment of the present invention. On the basis of the above embodiment, optionally with reference to fig. 4, the method comprises the steps of:
and S210, setting an opening output timer of the electronic expansion valve.
And S220, acquiring a target adjusting period of the opening output quantity of the electronic expansion valve according to a preset adjusting period calculating criterion.
And S230, judging whether the opening output timer of the electronic expansion valve is larger than or equal to the target adjusting period of the opening output quantity.
And S240, if so, acquiring the actual opening and the opening deviation of the electronic expansion valve, and acquiring the adjustment step length of the opening output quantity of the electronic expansion valve according to a preset adjustment step length calculation criterion.
Optionally, acquiring an opening degree deviation of the electronic expansion valve includes: acquiring a target opening degree of the electronic expansion valve; and acquiring the opening deviation of the electronic expansion valve according to the difference between the target opening of the electronic expansion valve and the actual opening of the electronic expansion valve.
The target opening degree of the electronic expansion valve may be set according to actual conditions, and is not particularly limited herein.
Assuming DEEVcabi _ refj _ k _ actual (k is the actual opening degree of the electronic expansion valve, and DEEVcabi _ refj _ k _ target (k) is the target opening degree of the electronic expansion valve, the calculation formula of the opening degree deviation DEEVcabi _ refj _ k _ err (k) of the electronic expansion valve is as follows:
DEEVcabi_refj_k_err(k)＝
DEEVcabi_refj_k_target(k)-DEEVcabi_refj_k_actual(k)
optionally, the calculation formula of the preset adjustment step calculation criterion is as follows:
wherein, DEEVcabi _ refj _ k _ err (k) is the adjustment step of the opening output quantity, and DEEVcabi _ refj _ k _ err (k) is the opening deviation of the electronic expansion valve.
Exemplary, the calculation of the adjustment step size is as shown in table 2 above.
Table 2 adjustment step size calculation example
| DEEVcabi_refj_k_err(k) | BEEVcabi_refj_k(k) |
| -20 | 5 |
| -15 | 4 |
| -10 | 3 |
| -5 | 2 |
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 2 |
| 10 | 3 |
| 15 | 4 |
| 20 | 5 |
| 25 | 6 |
| 30 | 7 |
| 90 | 19 |
| 150 | 31 |
| 210 | 43 |
| 270 | 55 |
| 330 | 67 |
| 390 | 79 |
| 480 | 97 |
S250, judging whether the opening deviation of the electronic expansion valve is equal to zero or not; if not, the opening output quantity of the controller is adjusted according to the actual opening of the electronic expansion valve and the adjustment step length of the opening output quantity.
If the opening deviation of the electronic expansion valve is equal to zero, the opening of the electronic expansion valve does not need to be adjusted, and the program is ended; if the opening deviation of the electronic expansion valve is not equal to zero, the actual opening of the electronic expansion valve is not consistent with the target opening, and the opening of the electronic expansion valve needs to be adjusted.
In the technical solution of this embodiment, the operating principle of the temperature smoothing control method for the environmental test chamber with the electronic expansion valve is as follows: first, an opening output timer of the electronic expansion valve is set. Then, acquiring a target adjustment period of the opening output quantity of the electronic expansion valve according to a preset adjustment period calculation criterion; judging whether an opening output timer of the electronic expansion valve is larger than or equal to a target adjustment period of the opening output quantity or not; if so, acquiring the actual opening and the opening deviation of the electronic expansion valve, and acquiring the adjustment step length of the opening output quantity of the electronic expansion valve according to a preset adjustment step length calculation criterion. Finally, judging whether the opening deviation of the electronic expansion valve is equal to zero or not; if not, the opening output quantity of the controller is adjusted according to the actual opening of the electronic expansion valve and the adjustment step length of the opening output quantity. Therefore, whether the opening degree of the electronic expansion valve needs to be adjusted can be automatically judged by judging whether the opening degree output timer of the electronic expansion valve is larger than or equal to the target adjustment period of the opening degree output quantity. When the opening degree of the electronic expansion valve is automatically judged to be required to be adjusted, the opening degree is not directly switched to the set target opening degree, the opening degree deviation of the electronic expansion valve and the adjustment step length of the opening degree output quantity are calculated, and whether the opening degree of the electronic expansion valve is required to be adjusted is judged again by judging whether the opening degree deviation of the electronic expansion valve is equal to zero or not, so that the accuracy of automatic judgment is improved. And after judging that the opening of the electronic expansion valve needs to be adjusted, adjusting the opening output quantity of the controller according to the actual opening of the electronic expansion valve and the adjustment step length of the opening output quantity so as to adjust the opening of the electronic expansion valve. Compared with the mode of directly switching to the set target opening for operation when the opening needs to be adjusted in the prior art, the method can automatically judge whether the opening of the electronic expansion valve needs to be adjusted or not, and adjust the opening by calling the target opening subprogram when the opening needs to be adjusted, so that the flow difference of the electronic expansion valve caused before and after the opening is switched and the problem of unsmooth temperature of a temperature control room caused by the difference can be reduced, the automatic control degree of the opening adjustment of the electronic expansion valve is improved, and the stability of the system operation is improved.
Fig. 5 is a flowchart of another temperature smoothing control method for an environmental test chamber with an electronic expansion valve according to an embodiment of the present invention. On the basis of the above embodiments, referring to fig. 5, the method comprises the following steps:
and S310, setting an opening output timer of the electronic expansion valve.
S320, acquiring the opening deviation of the electronic expansion valve and a temperature balance mark position of the temperature control chamber; and determining a target adjustment period of the opening output quantity of the electronic expansion valve according to the opening deviation of the electronic expansion valve and the temperature balance mark bit of the temperature control chamber.
The temperature balance flag of the temperature control chamber generally includes 1 and 0. The temperature balance flag of the temperature control chamber can be obtained from the corresponding temperature control chamber.
Optionally, determining a target adjustment period of an opening output quantity of the electronic expansion valve according to the opening deviation of the electronic expansion valve and a temperature balance flag of the temperature control chamber, including: when the temperature balance flag bit of the temperature control chamber is equal to zero, calculating a target adjustment period of the opening output quantity of the electronic expansion valve according to a first preset formula; and when the temperature balance flag bit of the temperature control chamber is equal to one, calculating a target adjustment period of the opening output quantity of the electronic expansion valve according to a second preset formula.
Optionally, the first preset formula is:
τEEVcabi_refj_k_target(k)
wherein τ EEVcabi _ refj _ k _ target (k) is a target adjustment period of the opening degree output quantity of the electronic expansion valve, and DEEVcabi _ refj _ k _ err (k) is an opening degree deviation of the electronic expansion valve.
Optionally, the second preset formula is:
τEEVcabi_refj_k_target(k)
wherein τ EEVcabi _ refj _ k _ target (k) is a target adjustment period of the opening degree output quantity of the electronic expansion valve, and DEEVcabi _ refj _ k _ err (k) is an opening degree deviation of the electronic expansion valve.
TABLE 3 example of calculation when the temperature balance flag of the temperature control compartment is equal to zero
| DEEVcabi_refj_k_err(k) | τEEVcabi_refj_k_target(k) |
| -20 | 58 |
| -15 | 59 |
| -10 | 59 |
| -5 | 60 |
| 0 | 60 |
| 1 | 60 |
| 2 | 60 |
| 3 | 60 |
| 4 | 60 |
| 5 | 60 |
| 6 | 60 |
| 10 | 59 |
| 15 | 59 |
| 20 | 58 |
| 25 | 58 |
| 30 | 57 |
| 90 | 51 |
| 150 | 45 |
| 210 | 39 |
| 270 | 33 |
| 330 | 27 |
| 390 | 21 |
| 480 | 12 |
TABLE 4 example of calculation when the temperature balance flag of the temperature controlled compartment is equal to zero
| DEEVcabi_refj_k_err(k) | τEEVcabi_refj_k_target(k) |
| -20 | 60 |
| -15 | 60 |
| -10 | 90 |
| -5 | 140 |
| 0 | 190 |
| 1 | 180 |
| 2 | 170 |
| 3 | 160 |
| 4 | 150 |
| 5 | 140 |
| 6 | 130 |
| 10 | 90 |
| 15 | 60 |
| 20 | 60 |
| 25 | 60 |
| 30 | 60 |
| 90 | 60 |
| 150 | 60 |
| 210 | 60 |
| 270 | 60 |
| 330 | 60 |
| 390 | 60 |
| 480 | 60 |
Table 3 shows an example of a target adjustment period of the opening output of the electronic expansion valve calculated according to the first preset formula when the temperature balance flag of the temperature control chamber is equal to zero.
Table 4 shows an example of a target adjustment period of the opening output of the electronic expansion valve calculated according to the second preset formula when the temperature balance flag of the temperature control chamber is equal to one.
S330, whether the opening output timer of the electronic expansion valve is larger than or equal to the target adjusting period of the opening output quantity is judged.
And S340, if yes, acquiring the actual opening and the opening deviation of the electronic expansion valve, and acquiring the adjustment step length of the opening output quantity of the electronic expansion valve according to a preset adjustment step length calculation criterion.
And S350, judging whether the opening deviation of the electronic expansion valve is equal to zero or not. If yes, the program is ended; if not, go to step S360.
Whether the opening degree of the electronic expansion valve needs to be adjusted or not can be preliminarily judged by judging whether the opening degree output timer of the electronic expansion valve is larger than or equal to the target adjustment period of the opening degree output quantity or not. After the opening degree adjustment is preliminarily judged to be needed, the accuracy of automatic judgment can be further improved by further judging whether the opening degree deviation of the electronic expansion valve is equal to zero, and the stability and the reliability of the system operation are further improved.
And S360, judging whether the opening deviation of the electronic expansion valve is greater than zero. If yes, go to step S370; if not, go to step S380.
If the deviation of the opening degree of the electronic expansion valve is not equal to zero according to the step S350, it indicates that the opening degree of the electronic expansion valve needs to be adjusted. Before the opening degree of the electronic expansion valve is adjusted, whether the opening degree deviation of the electronic expansion valve is larger than zero is further judged. If the opening degree is larger than zero, the opening degree of the electronic expansion valve is adjusted according to the adjustment method of step S370. If the opening degree is smaller than zero, the opening degree of the electronic expansion valve is adjusted according to the adjustment mode of the step S380.
And S370, adjusting the opening output quantity of the controller according to the sum of the actual opening of the electronic expansion valve and the adjustment step of the opening output quantity.
And S380, adjusting the opening output quantity of the controller according to the difference between the actual opening of the electronic expansion valve and the adjustment step length of the opening output quantity.
In the technical solution of this embodiment, the operating principle of the temperature smoothing control method for the environmental test chamber with the electronic expansion valve is as follows: first, an opening output timer of the electronic expansion valve is set. Then, acquiring the opening deviation of the electronic expansion valve and a temperature balance mark position of the temperature control chamber; and determining a target adjustment period of the opening output quantity of the electronic expansion valve according to the opening deviation of the electronic expansion valve and the temperature balance mark bit of the temperature control chamber. And judging whether the opening output timer of the electronic expansion valve is greater than or equal to the target adjustment period of the opening output quantity. If so, acquiring the actual opening and the opening deviation of the electronic expansion valve, and acquiring the adjustment step length of the opening output quantity of the electronic expansion valve according to a preset adjustment step length calculation criterion. And finally, judging whether the opening deviation of the electronic expansion valve is equal to zero or not. If yes, the program is ended; if not, further judging whether the opening deviation of the electronic expansion valve is larger than zero. If so, adjusting the opening output quantity of the controller according to the sum of the actual opening of the electronic expansion valve and the adjustment step length of the opening output quantity; if not, the opening output quantity of the controller is adjusted according to the difference between the actual opening of the electronic expansion valve and the adjustment step length of the opening output quantity. Therefore, whether the opening degree of the electronic expansion valve needs to be adjusted can be automatically judged by judging whether the opening degree output timer of the electronic expansion valve is larger than or equal to the target adjustment period of the opening degree output quantity. When the opening degree of the electronic expansion valve is automatically judged to be required to be adjusted, the opening degree is not directly switched to the set target opening degree, the opening degree deviation of the electronic expansion valve and the adjustment step length of the opening degree output quantity are calculated, and whether the opening degree of the electronic expansion valve is required to be adjusted is judged again by judging whether the opening degree deviation of the electronic expansion valve is equal to zero or not, so that the accuracy of automatic judgment is improved. And after judging that the opening of the electronic expansion valve needs to be adjusted, adjusting the opening output quantity of the controller according to the actual opening of the electronic expansion valve and the adjustment step length of the opening output quantity so as to adjust the opening of the electronic expansion valve. Compared with the mode of directly switching to the set target opening for operation when the opening needs to be adjusted in the prior art, the method can automatically judge whether the opening of the electronic expansion valve needs to be adjusted or not, and adjust the opening by calling the target opening subprogram when the opening needs to be adjusted, so that the flow difference of the electronic expansion valve caused before and after the opening is switched and the problem of unsmooth temperature of a temperature control room caused by the difference can be reduced, the automatic control degree of the opening adjustment of the electronic expansion valve is improved, and the stability of the system operation is improved.
Optionally, after adjusting the opening output quantity of the controller according to the target opening subroutine, the method further includes: and recording the opening output quantity of the controller, and resetting an opening output timer of the electronic expansion valve.
The opening output quantity of the recording controller is convenient to trace and use and the like. And resetting the opening output timer of the electronic expansion valve so as to operate the program of the next sampling period.
Fig. 6 is a schematic control flow chart of an overall temperature smoothing control method for an environmental test chamber with an electronic expansion valve according to an embodiment of the present invention. Referring to fig. 6, the process begins by first determining whether the opening output timer of the electronic expansion valve is greater than or equal to the target adjustment period of the opening output amount. If not, the procedure ends directly. If so, the opening degree of the electronic expansion valve needs to be adjusted, and then a target opening degree sub-program of the electronic expansion valve is called. The target opening degree subroutine of the electronic expansion valve is called, and first, whether the opening degree deviation of the electronic expansion valve is equal to zero or not is judged. If the value is equal to zero, the opening degree of the electronic expansion valve is judged again and does not need to be adjusted. If not, the opening degree of the electronic expansion valve still needs to be adjusted by judging again. Further, whether the opening deviation of the electronic expansion valve is larger than zero is judged. If the quantity of the opening output quantity is larger than zero, the quantity of the opening output quantity of the controller is equal to the sum of the actual opening of the electronic expansion valve and the adjustment step length of the opening output quantity. If the opening degree output quantity is smaller than zero, the opening degree output quantity of the controller is equal to the difference between the actual opening degree of the electronic expansion valve and the adjustment step length of the opening degree output quantity. And finally, recording the opening output quantity of the controller in the current sampling period and the opening output quantity of the controller in the previous sampling period, and resetting the opening output timer of the electronic expansion valve so as to operate the program in the next sampling period.
Fig. 7 is a comparison diagram illustrating the effect of temperature smoothing control provided in the embodiment of the present invention. Referring to fig. 7, a curve L1 is a temperature control effect curve of the temperature-controlled room obtained by using the temperature smoothing control method for the environmental test chamber with the electronic expansion valve according to the embodiment of the present invention, and a curve L2 is a temperature control effect curve of the temperature-controlled room obtained by using the conventional method, as can be seen from a comparison in fig. 7, the method according to the embodiment of the present invention can well avoid the problem of uneven temperature of the temperature-controlled room compared with the conventional technical solution.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A temperature smooth control method of an environmental test chamber with an electronic expansion valve is characterized by comprising the following steps:
setting an opening output timer of the electronic expansion valve; acquiring a target adjustment period of the opening output quantity of the electronic expansion valve according to a preset adjustment period calculation criterion;
judging whether an opening output timer of the electronic expansion valve is larger than or equal to a target adjustment period of the opening output quantity or not;
if so, calling a target opening subprogram of the electronic expansion valve, and adjusting the opening output quantity of the controller according to the target opening subprogram.
2. The method for smoothly controlling the temperature of an environmental test chamber having an electronic expansion valve according to claim 1, wherein the adjusting the opening output amount of the controller according to the target opening subroutine includes:
acquiring the actual opening of the electronic expansion valve, acquiring the opening deviation of the electronic expansion valve, and acquiring the adjustment step length of the opening output quantity of the electronic expansion valve according to a preset adjustment step length calculation criterion;
judging whether the opening deviation of the electronic expansion valve is equal to zero or not; and if not, adjusting the opening output quantity of the controller according to the actual opening of the electronic expansion valve and the adjustment step length of the opening output quantity.
3. A method for smoothly controlling a temperature of an environmental test chamber having an electronic expansion valve according to claim 2, wherein if not, adjusting an opening output of a controller according to an actual opening of the electronic expansion valve and an adjustment step of the opening output comprises:
if the opening deviation of the electronic expansion valve is not equal to zero, further judging whether the opening deviation of the electronic expansion valve is larger than zero;
if so, adjusting the opening output quantity of the controller according to the sum of the actual opening of the electronic expansion valve and the adjustment step length of the opening output quantity;
if not, the opening output quantity of the controller is adjusted according to the difference between the actual opening of the electronic expansion valve and the adjustment step length of the opening output quantity.
4. The method of claim 2, wherein the predetermined adjustment step calculation criterion is calculated by the following formula:
wherein, DEEVcabi _ refj _ k _ err (k) is an adjusting step of the opening output quantity, and DEEVcabi _ refj _ k _ err (k) is the opening deviation of the electronic expansion valve.
5. The method for smoothly controlling the temperature of an environmental test chamber having an electronic expansion valve according to claim 2, wherein the obtaining of the deviation of the opening degree of the electronic expansion valve includes:
acquiring a target opening degree of the electronic expansion valve;
and acquiring the opening deviation of the electronic expansion valve according to the difference between the target opening of the electronic expansion valve and the actual opening of the electronic expansion valve.
6. The method of claim 1, wherein the pre-set adjustment period calculation criteria includes:
acquiring the opening deviation of the electronic expansion valve and a temperature balance mark position of a temperature control chamber;
and determining a target adjustment period of the opening output quantity of the electronic expansion valve according to the opening deviation of the electronic expansion valve and the temperature balance flag bit of the temperature control chamber.
7. The method for smoothly controlling the temperature of an environmental test chamber having an electronic expansion valve according to claim 6, wherein the determining the target adjustment period of the opening output of the electronic expansion valve according to the opening deviation of the electronic expansion valve and the temperature balance flag of the temperature control chamber comprises:
when the temperature balance flag bit of the temperature control chamber is equal to zero, calculating a target adjustment period of the opening output quantity of the electronic expansion valve according to a first preset formula;
and when the temperature balance flag bit of the temperature control chamber is equal to one, calculating a target adjustment period of the opening output quantity of the electronic expansion valve according to a second preset formula.
8. The method of claim 7, wherein the first predetermined formula is:
wherein τ EEVcabi _ refj _ k _ target (k) is a target adjustment period of an opening output amount of the electronic expansion valve, and DEEVcabi _ refj _ k _ err (k) is an opening deviation of the electronic expansion valve.
9. The method of claim 7, wherein the second predetermined formula is:
wherein τ EEVcabi _ refj _ k _ target (k) is a target adjustment period of an opening output amount of the electronic expansion valve, and DEEVcabi _ refj _ k _ err (k) is an opening deviation of the electronic expansion valve.
10. The method for smoothly controlling the temperature of an environmental test chamber having an electronic expansion valve according to claim 1, further comprising, after adjusting an opening output amount of a controller according to the target opening subroutine: and recording the opening output quantity of the controller, and resetting an opening output timer of the electronic expansion valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211569502.7A CN115951731B (en) | 2022-12-08 | 2022-12-08 | Temperature smooth control method for environment test box with electronic expansion valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211569502.7A CN115951731B (en) | 2022-12-08 | 2022-12-08 | Temperature smooth control method for environment test box with electronic expansion valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115951731A true CN115951731A (en) | 2023-04-11 |
| CN115951731B CN115951731B (en) | 2023-11-28 |
Family
ID=87288568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211569502.7A Active CN115951731B (en) | 2022-12-08 | 2022-12-08 | Temperature smooth control method for environment test box with electronic expansion valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115951731B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000146313A (en) * | 1998-11-02 | 2000-05-26 | Daikin Ind Ltd | Operation controller for refrigerating machine |
| CN109945563A (en) * | 2019-03-22 | 2019-06-28 | 广东美的制冷设备有限公司 | The initial method of multi-line system and its electric expansion valve, device |
| US20190257563A1 (en) * | 2016-07-04 | 2019-08-22 | Qingdao Haier Air Conditioner General Corp., Ltd. | Method of controlling electronic expansion valve of air-conditioner |
| CN112665254A (en) * | 2020-12-28 | 2021-04-16 | 江苏拓米洛环境试验设备有限公司 | Control method and device for multi-chamber electronic expansion valve of refrigeration system and refrigeration system |
| CN114152001A (en) * | 2021-10-20 | 2022-03-08 | 山东和同信息科技股份有限公司 | High-precision control method and system for stepping electronic expansion valve |
-
2022
- 2022-12-08 CN CN202211569502.7A patent/CN115951731B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000146313A (en) * | 1998-11-02 | 2000-05-26 | Daikin Ind Ltd | Operation controller for refrigerating machine |
| US20190257563A1 (en) * | 2016-07-04 | 2019-08-22 | Qingdao Haier Air Conditioner General Corp., Ltd. | Method of controlling electronic expansion valve of air-conditioner |
| CN109945563A (en) * | 2019-03-22 | 2019-06-28 | 广东美的制冷设备有限公司 | The initial method of multi-line system and its electric expansion valve, device |
| CN112665254A (en) * | 2020-12-28 | 2021-04-16 | 江苏拓米洛环境试验设备有限公司 | Control method and device for multi-chamber electronic expansion valve of refrigeration system and refrigeration system |
| CN114152001A (en) * | 2021-10-20 | 2022-03-08 | 山东和同信息科技股份有限公司 | High-precision control method and system for stepping electronic expansion valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115951731B (en) | 2023-11-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110849007B (en) | Automatic refrigerant quantity adjusting and controlling method and device and air conditioner | |
| CN108759029B (en) | Air conditioning system, control method of air conditioning system and air conditioner | |
| CN104165486B (en) | The Defrost method of air-conditioner | |
| CN107990609B (en) | Control method of electronic expansion valve and refrigerant circulating system | |
| US7213404B2 (en) | Method for controlling operation of air conditioning system | |
| CN113339946B (en) | Air conditioner operation control method and device, air conditioner and computer storage medium | |
| KR102465985B1 (en) | Method for controlling electronic expansion valve of air conditioning facility | |
| CN109708284B (en) | Liquid level control method and device for gas-liquid separator after defrosting and air conditioner | |
| CN109458747B (en) | Air conditioner external unit, air conditioner and method for adjusting refrigerant in air conditioner | |
| JP2006284063A (en) | Thermo-hygrostat | |
| CN113188230A (en) | Expansion valve control method and device of multi-connected air conditioner and multi-connected air conditioner | |
| US11732948B2 (en) | Method for controlling refrigerator to alternately cool two storage compartments | |
| CN115183400A (en) | Air conditioner and defrosting control method thereof | |
| CN112665112A (en) | Air conditioner, control method thereof and readable storage medium | |
| CN115951731A (en) | Temperature smooth control method of environmental test chamber with electronic expansion valve | |
| CN113719964A (en) | Air conditioner control method and device and air conditioner | |
| CN110986458B (en) | Refrigeration equipment, control method and control device thereof and storage medium | |
| CN113587335B (en) | Control method and device for improving long-time temperature-reaching shutdown of air conditioner and air conditioner | |
| CN113188237B (en) | Control method and device of air conditioner, storage medium and processor | |
| CN111288695B (en) | Air conditioning system and parameter configuration method, device, control method and control device thereof | |
| PL199703B1 (en) | Method for regulating a cooling appliance | |
| CN115342507A (en) | Control method of air conditioner auxiliary valve, air conditioner and computer readable storage medium | |
| CN115183401A (en) | Air conditioner and defrosting control method thereof | |
| CN115823788B (en) | Refrigerating system temperature overshoot suppression method | |
| CN115823787B (en) | Rapid and stable control method for room temperature between refrigeration systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |