CN113639410A - Control method of electronic expansion valve in defrosting process of heat pump system and storage medium - Google Patents
Control method of electronic expansion valve in defrosting process of heat pump system and storage medium Download PDFInfo
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- CN113639410A CN113639410A CN202110777920.4A CN202110777920A CN113639410A CN 113639410 A CN113639410 A CN 113639410A CN 202110777920 A CN202110777920 A CN 202110777920A CN 113639410 A CN113639410 A CN 113639410A
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- 238000000034 method Methods 0.000 title claims abstract description 67
- 238000010257 thawing Methods 0.000 title claims abstract description 34
- 238000004364 calculation method Methods 0.000 claims abstract description 44
- 238000011156 evaluation Methods 0.000 claims description 7
- 230000001419 dependent effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 238000005094 computer simulation Methods 0.000 claims description 4
- 239000003507 refrigerant Substances 0.000 abstract description 30
- 239000007788 liquid Substances 0.000 abstract description 11
- 238000010438 heat treatment Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- XCWPUUGSGHNIDZ-UHFFFAOYSA-N Oxypertine Chemical compound C1=2C=C(OC)C(OC)=CC=2NC(C)=C1CCN(CC1)CCN1C1=CC=CC=C1 XCWPUUGSGHNIDZ-UHFFFAOYSA-N 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of heat pumps, and particularly provides a control method of an electronic expansion valve in a defrosting process of a heat pump system. The invention aims to solve the problems that the electronic expansion valve generally adopts a method of fixing the opening degree in the defrosting process of the existing heat pump system, so that the refrigerant flowing back to the compressor cannot be ensured to be in a gaseous state, the compressor is easy to generate liquid impact phenomenon and even damage, and the like. To this end, the present invention can input the actual temperature of the outdoor environment and the actual temperature of the indoor environment as arguments into a pre-trained calculation model to determine a predicted opening degree of the electronic expansion valve and control the electronic expansion valve based on the predicted opening degree of the electronic expansion valve. Therefore, the opening value of the electronic expansion valve can be adjusted in real time under different outdoor environment temperatures and indoor environment temperatures, the refrigerant flowing back to the compressor is ensured to be in a gaseous state, and the problems that the compressor is subjected to liquid impact and even damaged are avoided.
Description
Technical Field
The invention relates to the technical field of heat pumps, and particularly provides a control method and a storage medium for an electronic expansion valve in a defrosting process of a heat pump system.
Background
A heat pump system is a device that uses high-level energy to cause heat to flow from a low-level heat source to a high-level heat source. The heat pump system comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger, an electronic expansion valve, a four-way reversing valve and other devices. The electronic expansion valve is connected between one end of the outdoor heat exchanger and one end of the indoor heat exchanger, the other end of the outdoor heat exchanger and the other end of the indoor heat exchanger are respectively connected to two different interface ends of the four-way reversing valve, and the air suction port and the air exhaust port of the compressor are also respectively connected to the other two interface ends of the four-way reversing valve.
When the heat pump system heats in winter, the four-way reversing valve controls the refrigerant to flow out of the exhaust port of the compressor, sequentially pass through the indoor heat exchanger, the electronic expansion valve and the outdoor heat exchanger, and finally flow back to the air suction port of the compressor, at the moment, the outdoor heat exchanger serves as an evaporator to absorb heat of an outdoor environment, and the indoor heat exchanger serves as a condenser to release heat to the indoor environment. In the heating process of the heat pump system, water vapor in the outdoor environment frosts when meeting the outer surface with lower temperature on the outdoor heat exchanger, and the heating effect of the heat pump system is influenced when the frost layer on the outer surface of the outdoor heat exchanger is accumulated to a certain thickness. At this time, defrosting of the outdoor heat exchanger is required.
In the defrosting process of the heat pump system, the four-way reversing valve controls the refrigerant to flow out of an exhaust port of the compressor, sequentially pass through the outdoor heat exchanger, the electronic expansion valve and the indoor heat exchanger, and finally flow back to an air suction port of the compressor, at the moment, the indoor heat exchanger is used as an evaporator to naturally absorb heat from an indoor environment, at the moment, an indoor fan is closed, and the outdoor heat exchanger is used as a condenser to release heat to melt a frost layer on the outer surface of the outdoor heat exchanger.
At present, an electronic expansion valve in a defrosting process of a heat pump system generally adopts a method of fixing the opening degree, namely, the opening degree of the electronic expansion valve is not adjusted in the defrosting process. However, the opening of the electronic expansion valve is kept unchanged under different indoor temperatures, which causes different throttling states and flow rates of the refrigerant, so that the refrigerant flowing back to the compressor cannot be guaranteed to be in a gaseous state, and the compressor is prone to liquid impact and even damage.
Accordingly, there is a need in the art for a new control method for an electronic expansion valve during defrosting of a heat pump system to solve the above problems.
Disclosure of Invention
The invention aims to solve the technical problems that the electronic expansion valve generally adopts a fixed opening method in the defrosting process of the existing heat pump system, so that the refrigerant flowing back to the compressor cannot be ensured to be in a gaseous state, the compressor is easy to have liquid impact phenomenon and even damage, and the like.
In a first aspect, the present invention provides a control method for an electronic expansion valve during defrosting of a heat pump system, the control method comprising: obtaining the actual temperature T of the outdoor environment in the defrosting process of the heat pump systemwActual temperature T of the indoor environmentn(ii) a Calculating the actual temperature T of the outdoor environmentwActual temperature T of the indoor environmentnAs independent variable input into a pre-trained calculation model to determine the expected opening degree E of the electronic expansion valvepx(ii) a Based on the predicted opening E of the electronic expansion valvepxAnd controlling the electronic expansion valve.
As a preferable aspect of the control method provided by the present invention, "based on the predicted opening degree E of the electronic expansion valvepxThe step of controlling the electronic expansion valve comprises: the electrons are injected intoEstimated opening degree E of expansion valvepxAnd setting a minimum opening value EminAnd setting a maximum opening value EmaxComparing; when E ispx<EminAdjusting the opening degree value of the electronic expansion valve to Emin(ii) a When E ismin<Epx<EmaxAdjusting the opening degree value of the electronic expansion valve to Epx(ii) a When E ispx>EmaxAdjusting the opening degree value of the electronic expansion valve to Emax。
As a preferable technical solution of the control method provided by the present invention, the training method of the calculation model includes: obtaining a batch of actual temperatures T comprising said outdoor environmentwActual temperature T of the indoor environmentnAnd a predicted opening degree E of the electronic expansion valvepxThe data set of (1); and inputting the data set into the selected computational model to be trained, and obtaining solving parameters in the computational model to be trained.
As a preferable technical solution of the control method provided by the present invention, the method for obtaining the calculation model includes: obtaining a plurality of trained calculation models and evaluation indexes thereof; and selecting one with the highest accuracy from the plurality of trained calculation models according to the evaluation indexes of the plurality of trained calculation models, and determining the selected one as the calculation model.
As a preferable technical solution of the above control method provided by the present invention, the calculation model uses the actual temperature T of the indoor environmentnWith the actual temperature T of the outdoor environmentwThe actual temperature difference between the two is used as an independent variable, and the predicted opening degree E of the electronic expansion valvepxIs a dependent variable; alternatively, the calculation model is based on the actual temperature T of the indoor environmentnAnd the actual temperature T of the outdoor environmentwIs two independent variables and is based on the predicted opening degree E of the electronic expansion valvepxIs a dependent variable.
As a preferable technical solution of the above control method provided by the present invention, the calculation model to be trained includes any one of the following: epx＝Ep×[1+A1×(Tn-Ts)+A2×(Tw-T0)]In the formula EpFor a reference temperature T in an outdoor environmentoReference temperature T of indoor environmentsOpening degree of electronic expansion valve required for ensuring defrosting effect under conditions, A1、A2Is a parameter to be solved; epx＝B1×Tn+B2×Tw+B3In the formula B1、B2And B3Is a parameter to be solved;
in the formula C1、C2And C3Is a parameter to be solved; epx＝D1(Tn-Tw)+D2In the formula D1And D2Is a parameter to be solved;
in the formula F1、F2And F3Are parameters to be solved.
As a preferable technical solution of the control method provided by the present invention, the calculation model includes a plurality of outdoor environment temperature intervals, each of the outdoor environment temperature intervals corresponds to a plurality of indoor environment temperature intervals, and one of the outdoor environment temperature intervals and one of the indoor environment temperature intervals correspond to an expected opening degree of the electronic expansion valve.
As a preferred technical solution of the above control method provided by the present invention, the calculation model is obtained under the condition that the compressor power, the outdoor fan power, and the specifications of the indoor heat exchanger and the outdoor heat exchanger are not changed.
As a preferable technical solution of the above control method provided by the present invention, the calculation model satisfies the following requirements: actual temperature T of the indoor environmentnUnder constant conditions, the actual temperature T of the outdoor environmentwThe lower the expected opening degree E of the electronic expansion valvepxThe smaller; and/or at the actual temperature T of the outdoor environmentwUnder the same conditions, theActual temperature T of indoor environmentnThe higher the expected opening degree E of the electronic expansion valvepxThe larger.
In a second aspect, the present invention further provides a storage medium, wherein the storage medium stores a control program of an electronic expansion valve during defrosting of a heat pump system, and the control program is executed by a processor to implement the control method according to any one of the aspects of the first aspect.
Under the condition of adopting the technical scheme, the invention can take the actual temperature of the outdoor environment and the actual temperature of the indoor environment as independent variables to be input into a pre-trained calculation model so as to determine the expected opening degree of the electronic expansion valve, and control the electronic expansion valve based on the expected opening degree of the electronic expansion valve. Therefore, the opening value of the electronic expansion valve can be adjusted in real time under different outdoor environment temperatures and indoor environment temperatures, the refrigerant flowing back to the compressor is ensured to be in a gaseous state, and the problems that the compressor is subjected to liquid impact and even damaged are avoided.
Further, under the condition that the actual temperature of the indoor environment is not changed, the lower the actual temperature of the outdoor environment is, the smaller the expected opening degree of the electronic expansion valve is, so that the flow of the refrigerant is reduced, and the refrigerant is fully gasified in the indoor heat exchanger; under the condition that the actual temperature of the outdoor environment is not changed, the higher the actual temperature of the indoor environment is, the larger the expected opening degree of the electronic expansion valve is, so that the refrigerant is gasified by fully utilizing the temperature of the indoor environment in the indoor heat exchanger. Finally, the flow of the refrigerant is adjusted by changing the throttling state of the electronic expansion valve, the refrigerant flowing back to the compressor is ensured to be in a gaseous state, and the problems that the compressor is subjected to liquid impact and even damaged are avoided.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present invention. Moreover, like numerals are used to indicate like parts throughout the figures. The control method of the electronic expansion valve during defrosting of the heat pump system according to the present invention will be described with reference to the accompanying drawings in conjunction with the heat pump system. In the drawings:
fig. 1 is a schematic structural diagram of a heat pump system of the present embodiment;
fig. 2 is a schematic flow chart of a control method of the electronic expansion valve in the defrosting process of the heat pump system according to the embodiment.
List of reference numerals
1-a compressor; 2-outdoor heat exchanger; 3-indoor heat exchanger; 4-an electronic expansion valve; 5-four-way reversing valve.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that the terms "first", "second" and "third" in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, in the heat pump system, a refrigerant circulation circuit is formed among a compressor 1, an electronic expansion valve 4, an indoor heat exchanger 3, and an outdoor heat exchanger 2. In the refrigerant circulation loop, an exhaust port of a compressor 1 is communicated with a first end (a d end of a four-way reversing valve 5 in the figure) of the four-way reversing valve 5, an air inlet of the compressor 1 is communicated with a third end (an s end of the four-way reversing valve 5 in the figure) of the four-way reversing valve 5, a first end of an indoor heat exchanger 3 is communicated with a second end (an e end of the four-way reversing valve 5 in the figure) of the four-way reversing valve 5, and a first end of an outdoor heat exchanger 2 is communicated with a fourth end (a c end of the four-way reversing valve 5 in the figure) of the four-way reversing valve 5; the second end of the indoor heat exchanger 3 is communicated with the second end of the outdoor heat exchanger 2 through an electronic expansion valve 4. The controller of the heat pump air conditioning system can switch the refrigerant circulation route between the heating mode and the defrosting mode by controlling the four-way reversing valve 5.
In the heating mode, the controller conducts the first end (the d end of the four-way reversing valve 5 in the figure) and the fourth end (the c end of the four-way reversing valve 5 in the figure) of the four-way reversing valve 5, and conducts the second end (the e end of the four-way reversing valve 5 in the figure) and the third end (the s end of the four-way reversing valve 5 in the figure) of the four-way reversing valve 5. In the refrigerant circulation circuit in the heating mode, the refrigerant enters the indoor heat exchanger 3 from the exhaust port of the compressor 1 and returns to the suction port of the compressor 1 through the electronic expansion valve 4 and the outdoor heat exchanger 2 in sequence. At this time, the outdoor heat exchanger 2 functions as an evaporator to absorb heat of the outdoor environment, and the indoor heat exchanger 3 functions as a condenser to release heat to the indoor environment. In the heating process of the heat pump system, water vapor in the outdoor environment can frost when meeting the outer surface with lower temperature on the outdoor heat exchanger 2, and the heating effect of the heat pump system can be influenced when the frost layer on the outer surface of the outdoor heat exchanger 2 is accumulated to a certain thickness. At this time, it is necessary to defrost the outdoor heat exchanger 2.
In the defrosting mode, the controller connects the first end (in the figure, the d end of the four-way reversing valve 5) and the second end (in the figure, the e end of the four-way reversing valve 5) of the four-way reversing valve 5, and connects the third end (in the figure, the s end of the four-way reversing valve 5) and the fourth end (in the figure, the c end of the four-way reversing valve 5) of the four-way reversing valve 5. In the refrigerant circulation route in the defrosting mode, the refrigerant enters the outdoor heat exchanger 2 from the exhaust port of the compressor 1 and returns to the suction port of the compressor 1 through the electronic expansion valve 4 and the indoor heat exchanger 3 in sequence. At this time, the indoor heat exchanger 3 naturally absorbs heat from the indoor environment as an evaporator and the indoor fan is turned off at this time, and the outdoor heat exchanger 2 releases heat as a condenser to melt the frost layer on the outer surface thereof.
At present, the electronic expansion valve 4 generally adopts a method of fixing the opening degree in the defrosting process of the heat pump system, i.e. the opening degree of the electronic expansion valve 4 is not adjusted in the defrosting process. However, the opening degree of the electronic expansion valve 4 is kept unchanged under different indoor temperature conditions, which causes different throttling states and flow rates of the refrigerant, so that the refrigerant flowing back to the compressor 1 cannot be guaranteed to be in a gaseous state, and the compressor 1 is prone to liquid impact and even damage.
The present embodiment aims to solve the above technical problems, that is, the problems that the refrigerant flowing back to the compressor 1 cannot be guaranteed to be gaseous due to the fact that the electronic expansion valve 4 generally adopts a method of fixed opening degree in the defrosting process of the existing heat pump system, so that the compressor 1 is easily subjected to liquid impact phenomenon and even damaged, and the like are solved.
In a first aspect, the present embodiment provides a method for controlling an electronic expansion valve 4 during defrosting of a heat pump system, as shown in fig. 2, the method includes:
s1, acquiring the actual temperature T of the outdoor environment in the defrosting process of the heat pump systemwActual temperature T of the indoor environmentn。
It should be noted that the outdoor unit of the heat pump system generally includes a compressor 1, an outdoor heat exchanger 2, an outdoor fan (not shown), and the like, and the indoor unit of the heat pump system generally includes an indoor heat exchanger 3, an indoor fan (not shown), and the like. The outdoor temperature monitor is arranged on the outer shell of the outdoor unit to monitor the outdoor temperature, and the outdoor temperature monitor is arranged on the outer shell of the indoor unit to monitor the indoor temperature.
S2, converting the actual temperature T of the outdoor environmentwActual temperature T of the indoor environmentnAs independent variables, to determine the expected opening E of the electronic expansion valve 4px。
It should be noted that, for the same heat pump system, the specifications of the indoor heat exchanger 3 and the outdoor heat exchanger 2 are fixed, and the indoor fan and the outdoor fan are generally not turned on and the power of the compressor 1 is kept unchanged in the defrosting mode, that is, the key factors influencing the state of the refrigerant in the heat pump system at this time are the outdoor environment temperature and the indoor environment temperature. In this case, the calculation model is substantially obtained under the condition that the power of the compressor 1, the power of the outdoor fan, and the specifications of the indoor heat exchanger 3 and the outdoor heat exchanger 2 are kept unchanged.
As a preferred implementation of the above control method provided in this embodiment, the training method of the calculation model in step S2 includes:
s201, acquiring batch actual temperature T containing outdoor environmentwActual temperature T of the indoor environmentnAnd the expected opening degree E of the electronic expansion valve 4pxThe data set of (1). It should be noted that the data set is the opening degree of the electronic expansion valve 4 required for ensuring the defrosting effect under the specific conditions of the outdoor environment temperature and the indoor environment temperature, and when the data in the data set is satisfied, the operation state of the compressor is good, and the liquid impact phenomenon cannot occur.
S202, inputting the data set into the selected calculation model to be trained, and obtaining solving parameters in the calculation model to be trained.
As a preferred implementation of the above control method provided in this embodiment, the calculation model to be trained in step S202 includes any one of the following:
(1)Epx＝Ep×[1+A1×(Tn-Ts)+A2×(Tw-T0)]
in the formula, EpFor a reference temperature T in an outdoor environmentoReference temperature T of indoor environmentsThe opening degree of the electronic expansion valve 4 required for ensuring the defrosting effect under the condition. Wherein, the outdoor environment and the indoor environment temperature in the common situation can be selected as the reference temperature To、Ts。A1、A2Are parameters to be solved.
(2)Epx＝B1×Tn+B2×Tw+B3
In the formula, B1、B2And B3Are parameters to be solved.
In the formula, C1、C2And C3Are parameters to be solved.
(4)Epx＝D1(Tn-Tw)+D2
In the formula, D1And D2Are parameters to be solved.
In the formula, F1、F2And F3Are parameters to be solved.
It can be seen that the calculation models represented in equations (1) to (3) are based on the actual temperature T of the indoor environmentnAnd the actual temperature T of the outdoor environmentwIs two independent variables and is calculated according to the expected opening degree E of the electronic expansion valve 4pxIs a dependent variable. In addition, the actual temperature T of the indoor environment can be calculated in the calculation models represented in equations (4) and (5)nActual temperature T with outdoor environmentwThe actual temperature difference therebetween as an independent variable, and the predicted opening degree E of the electronic expansion valve 4pxIs a dependent variable.
As a preferable implementation of the control method provided in this embodiment, the method for obtaining the calculation model includes: and acquiring a plurality of trained calculation models and evaluation indexes thereof. For example, while the band solution parameters in the formulas (1) to (5) after training are obtained, the variance of the model and other evaluation indexes that can represent the degree of data fitting can also be obtained. Then, one of the plurality of trained calculation models having the highest accuracy is selected according to the evaluation index of the plurality of trained calculation models and determined as a calculation model.
In addition to selecting the function model as the calculation model, as another preferred implementation of the control method provided in this embodiment, the calculation model may further include a plurality of outdoor environment temperature intervals, each of the outdoor environment temperature intervals corresponds to a plurality of indoor environment temperature intervals, and one outdoor environment temperature interval and one indoor environment temperature interval correspond to the expected opening degree of one electronic expansion valve 4.
Can be used forIt is understood that the actual temperature T of the outdoor environment may be based onwFinding the temperature interval of the outdoor environment where the temperature is located according to the actual temperature T of the indoor environmentnSearching the indoor environment temperature interval in which the electronic expansion valve is positioned, and finally determining the expected opening degree E of the corresponding electronic expansion valve 4 according to the found outdoor environment temperature interval and the indoor environment temperature intervalpx。
In fact, the above calculation models are all required to substantially satisfy the following requirements: actual temperature T in the indoor environmentnThe actual temperature T of the outdoor environment under constant conditionswThe lower the expected opening E of the electronic expansion valve 4pxThe smaller; and/or the actual temperature T in the outdoor environmentwThe actual temperature T of the indoor environment under constant conditionsnThe higher the expected opening E of the electronic expansion valve 4pxThe larger.
In this way, in the case of the above embodiment, under the condition that the actual temperature of the indoor environment is not changed, the lower the actual temperature of the outdoor environment is, the smaller the expected opening degree of the electronic expansion valve 4 is, so as to reduce the refrigerant flow rate, so that the refrigerant is sufficiently vaporized in the indoor heat exchanger 3; under the condition that the actual temperature of the outdoor environment is not changed, the higher the actual temperature of the indoor environment is, the larger the expected opening degree of the electronic expansion valve 4 is, so that the refrigerant is gasified by fully utilizing the temperature of the indoor environment in the indoor heat exchanger 3. Finally, the flow of the refrigerant is adjusted by changing the throttling state of the electronic expansion valve 4, the refrigerant flowing back to the compressor 1 is ensured to be in a gaseous state, and the problems that the compressor 1 is subjected to liquid impact and even damaged are avoided.
S3 estimating opening E of electronic expansion valve 4pxThe electronic expansion valve 4 is controlled.
As a preferred implementation of the above control method provided in this embodiment, step S3 includes: the predicted opening degree E of the electronic expansion valve 4pxAnd setting a minimum opening value EminAnd setting a maximum opening value EmaxComparing; when E ispx<EminWhen the opening degree of the electronic expansion valve 4 is adjusted to Emin(ii) a When E ismin<Epx<EmaxWhen the opening degree of the electronic expansion valve 4 is adjusted to Epx(ii) a When E ispx>EmaxWhen the opening degree of the electronic expansion valve 4 is adjusted to Emax。
It will be understood that EminAnd EmaxThe minimum opening degree and the maximum opening degree of the electronic expansion valve can be maintained, and the minimum opening degree and the maximum opening degree required by the heat pump system for realizing the defrosting function can also be maintained.
In the case of the above-described embodiment, the present embodiment can input the actual temperature of the outdoor environment and the actual temperature of the indoor environment as arguments into a calculation model trained in advance to determine the expected opening degree of the electronic expansion valve 4, and control the electronic expansion valve 4 based on the expected opening degree of the electronic expansion valve 4. Therefore, the opening value of the electronic expansion valve 4 can be adjusted in real time under different outdoor environment temperatures and indoor environment temperatures, the refrigerant flowing back to the compressor 1 is ensured to be gaseous, and the problems that the compressor 1 is subjected to liquid impact and even damaged are avoided.
It should be noted that although the detailed steps of the method of the present invention have been described in detail, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
The present invention may also be embodied as an apparatus or device program (e.g., PC program and PC program product) for carrying out a portion or all of the methods described herein. Such a program implementing the invention may be stored on a PC readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
In a second aspect, the present embodiment further provides a storage medium, wherein the storage medium stores a control program of the electronic expansion valve 4 during defrosting of the heat pump system, and the control program, when executed by the processor, implements the control method according to any one of the embodiments of the first aspect.
It should be noted that the storage medium may be a memory in the heat pump system, and the processor may be a controller specially used for executing the method of the present invention, or may be a functional module or a functional unit of a general controller.
The storage medium includes, but is not limited to, a usb disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, a flash Memory, a volatile Memory, a non-volatile Memory, a serial Memory, a parallel Memory, or a register, and various media capable of storing program codes, and the processor includes, but is not limited to, a CPLD/FPGA, a DSP, an ARM processor, and an MIPS processor. Such well-known structures are not shown in the drawings in order to not unnecessarily obscure embodiments of the present disclosure.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method for an electronic expansion valve during defrosting of a heat pump system, the control method comprising:
obtaining the actual temperature T of the outdoor environment in the defrosting process of the heat pump systemwActual temperature T of the indoor environmentn；
Calculating the actual temperature T of the outdoor environmentwActual temperature T of the indoor environmentnAs independent variable input into a pre-trained calculation model to determine the expected opening degree E of the electronic expansion valvepx；
Based on the predicted opening E of the electronic expansion valvepxAnd controlling the electronic expansion valve.
2. The control method according to claim 1, wherein "based on an expected opening degree E of the electronic expansion valvepxThe step of controlling the electronic expansion valve comprises:
the predicted opening degree E of the electronic expansion valvepxAnd setting a minimum opening value EminAnd setting a maximum opening value EmaxComparing;
when E ispx<EminAdjusting the opening degree value of the electronic expansion valve to Emin；
When E ismin<Epx<EmaxAdjusting the opening degree value of the electronic expansion valve to Epx；
When E ispx>EmaxAdjusting the opening degree value of the electronic expansion valve to Emax。
3. The control method according to claim 1, wherein the training method of the calculation model includes:
obtaining a batch of actual temperatures T comprising said outdoor environmentwActual temperature T of the indoor environmentnAnd a predicted opening degree E of the electronic expansion valvepxThe data set of (1);
and inputting the data set into the selected computational model to be trained, and obtaining solving parameters in the computational model to be trained.
4. The control method according to claim 3, characterized in that the calculation model obtaining method includes:
obtaining a plurality of trained calculation models and evaluation indexes thereof;
and selecting one with the highest accuracy from the plurality of trained calculation models according to the evaluation indexes of the plurality of trained calculation models, and determining the selected one as the calculation model.
5. Control method according to claim 3, characterized in that the calculation model uses the actual temperature T of the indoor environmentnWith the actual temperature T of the outdoor environmentwThe actual temperature difference between the two is used as an independent variable, and the predicted opening degree E of the electronic expansion valvepxIs a dependent variable; alternatively, the first and second electrodes may be,
the calculation model is based on the actual temperature T of the indoor environmentnAnd the actual temperature T of the outdoor environmentwIs two independent variables and is based on the predicted opening degree E of the electronic expansion valvepxIs a dependent variable.
6. The control method according to claim 3, characterized in that the calculation model to be trained comprises any one of:
Epx＝Ep×[1+A1×(Tn-Ts)+A2×(Tw-T0)]in the formula EpFor a reference temperature T in an outdoor environmentoReference temperature T of indoor environmentsOpening degree of electronic expansion valve required for ensuring defrosting effect under conditions, A1、A2Is a parameter to be solved;
Epx＝B1×Tn+B2×Tw+B3in the formula B1、B2And B3Is a parameter to be solved;
Epx＝D1(Tn-Tw)+D2in the formula D1And D2Is a parameter to be solved;
7. The control method according to claim 1, wherein the calculation model includes a plurality of outdoor environment temperature intervals, each of the outdoor environment temperature intervals corresponds to a plurality of indoor environment temperature intervals, and one outdoor environment temperature interval and one indoor environment temperature interval correspond to a predicted opening degree of one electronic expansion valve.
8. The control method according to claim 1, wherein the calculation model is derived under the condition that the compressor power, the outdoor fan power, the specifications of the indoor heat exchanger and the outdoor heat exchanger are kept unchanged.
9. The control method according to claim 1, characterized in that the calculation model satisfies the following requirements:
actual temperature T of the indoor environmentnUnder constant conditions, the actual temperature T of the outdoor environmentwThe lower the expected opening degree E of the electronic expansion valvepxThe smaller; and/or the like and/or,
actual temperature T at the outdoor environmentwUnder constant conditions, the actual temperature T of the indoor environmentnThe higher the expected opening degree E of the electronic expansion valvepxThe larger.
10. A storage medium having stored thereon a control program for an electronic expansion valve during defrosting of a heat pump system, the control program, when executed by a processor, implementing a control method according to any one of claims 1 to 9.
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| CN202110777920.4A CN113639410A (en) | 2021-07-09 | 2021-07-09 | Control method of electronic expansion valve in defrosting process of heat pump system and storage medium |
| PCT/CN2022/104503 WO2023280286A1 (en) | 2021-07-09 | 2022-07-08 | Method for controlling electronic expansion valve during defrosting process of heat pump system, and storage medium |
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| CN202110777920.4A CN113639410A (en) | 2021-07-09 | 2021-07-09 | Control method of electronic expansion valve in defrosting process of heat pump system and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279113A (en) * | 2021-12-29 | 2022-04-05 | 中山市爱美泰电器有限公司 | Control method for quickly positioning opening of electronic expansion valve after defrosting of heat pump system |
| WO2023280286A1 (en) * | 2021-07-09 | 2023-01-12 | 青岛海尔空调电子有限公司 | Method for controlling electronic expansion valve during defrosting process of heat pump system, and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04155139A (en) * | 1990-10-19 | 1992-05-28 | Matsushita Electric Ind Co Ltd | Air conditioner |
| JP2003185307A (en) * | 2001-12-20 | 2003-07-03 | Fujitsu General Ltd | Control apparatus of air conditioner |
| CN106022505A (en) * | 2016-04-28 | 2016-10-12 | 华为技术有限公司 | Method and device of predicting user off-grid |
| CN111425992A (en) * | 2020-04-13 | 2020-07-17 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device, storage medium and air conditioner |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI373597B (en) * | 2009-12-02 | 2012-10-01 | Ind Tech Res Inst | Method for controlling the temperature of spilt-type air conditioning equipment |
| CN103234254B (en) * | 2013-04-12 | 2016-08-10 | 惠州Tcl家电集团有限公司 | Method, air-conditioning and the server of heat pump performance parameter optimization based on server |
| US9651929B2 (en) * | 2014-09-29 | 2017-05-16 | International Business Machines Corporation | HVAC system control integrated with demand response, on-site energy storage system and on-site energy generation system |
| CN104949413B (en) * | 2015-07-07 | 2017-06-30 | 珠海格力电器股份有限公司 | The method and apparatus for obtaining electric expansion valve initial opening |
| CN107023945A (en) * | 2017-04-01 | 2017-08-08 | 青岛海尔空调电子有限公司 | Air-conditioning system and the control method for air-conditioning system |
| CN107642873B (en) * | 2017-10-31 | 2019-12-06 | 海信（山东）空调有限公司 | Air conditioner and opening control method of electronic expansion valve during starting of air conditioner |
| CN109520099A (en) * | 2018-11-27 | 2019-03-26 | 宁波奥克斯电气股份有限公司 | A kind of initial opening control method, device and the air conditioner of electric expansion valve |
| CN111765604B (en) * | 2019-04-01 | 2021-10-08 | 珠海格力电器股份有限公司 | Control method and device of air conditioner |
| CN112443943A (en) * | 2019-08-30 | 2021-03-05 | 珠海格力电器股份有限公司 | Model training method based on small amount of labeled data, control system and air conditioner |
| CN111878964B (en) * | 2020-07-27 | 2022-02-08 | 宁波奥克斯电气股份有限公司 | Control method and device of electronic expansion valve, air conditioner and storage medium |
| CN113639410A (en) * | 2021-07-09 | 2021-11-12 | 青岛海尔空调电子有限公司 | Control method of electronic expansion valve in defrosting process of heat pump system and storage medium |
-
2021
- 2021-07-09 CN CN202110777920.4A patent/CN113639410A/en active Pending
-
2022
- 2022-07-08 WO PCT/CN2022/104503 patent/WO2023280286A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04155139A (en) * | 1990-10-19 | 1992-05-28 | Matsushita Electric Ind Co Ltd | Air conditioner |
| JP2003185307A (en) * | 2001-12-20 | 2003-07-03 | Fujitsu General Ltd | Control apparatus of air conditioner |
| CN106022505A (en) * | 2016-04-28 | 2016-10-12 | 华为技术有限公司 | Method and device of predicting user off-grid |
| CN111425992A (en) * | 2020-04-13 | 2020-07-17 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device, storage medium and air conditioner |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023280286A1 (en) * | 2021-07-09 | 2023-01-12 | 青岛海尔空调电子有限公司 | Method for controlling electronic expansion valve during defrosting process of heat pump system, and storage medium |
| CN114279113A (en) * | 2021-12-29 | 2022-04-05 | 中山市爱美泰电器有限公司 | Control method for quickly positioning opening of electronic expansion valve after defrosting of heat pump system |
| CN114279113B (en) * | 2021-12-29 | 2024-01-30 | 中山市爱美泰电器有限公司 | Control method for quickly positioning opening of electronic expansion valve after defrosting of heat pump system |
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|---|---|
| WO2023280286A1 (en) | 2023-01-12 |
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Application publication date: 20211112 |