CN110388772B - Control method and device for electronic expansion valve of heat pump air conditioner and heat pump air conditioner - Google Patents

Control method and device for electronic expansion valve of heat pump air conditioner and heat pump air conditioner Download PDF

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Publication number
CN110388772B
CN110388772B CN201910585911.8A CN201910585911A CN110388772B CN 110388772 B CN110388772 B CN 110388772B CN 201910585911 A CN201910585911 A CN 201910585911A CN 110388772 B CN110388772 B CN 110388772B
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preset
value
expansion valve
electronic expansion
exhaust superheat
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CN110388772A (en
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张建鹏
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Midea Group Co Ltd
Chongqing Midea General Refrigeration Equipment Co Ltd
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Midea Group Co Ltd
Chongqing Midea General Refrigeration Equipment Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2513Expansion valves

Abstract

The invention provides a control method and a control device for an electronic expansion valve of a heat pump air conditioner and the heat pump air conditioner, wherein the method comprises the following steps: after the pre-opening degree of the electronic expansion valve, determining the pressure ratio of the heat pump air conditioner; obtaining a target exhaust superheat degree value according to the pressure ratio; and controlling the electronic expansion valve by the actual exhaust superheat value and the target exhaust superheat value. The invention continuously adjusts the exhaust superheat target value controlled by the electronic expansion valve based on the pressure ratio change, improves the calculation precision of the exhaust superheat target value, and can improve the adjustment precision and the adaptability of the electronic expansion valve during heating, thereby improving the stability of the heat pump air conditioner.

Description

Control method and device for electronic expansion valve of heat pump air conditioner and heat pump air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device for an electronic expansion valve of a heat pump air conditioner and the heat pump air conditioner.
Background
At present, in a common air source heat pump unit, an electronic expansion valve is generally controlled according to an air suction superheat degree or an exhaust superheat degree during heating operation. The defect of controlling according to the suction superheat degree is that the suction superheat degree of a low-temperature heating section is small and approaches to zero, and the condition that the electronic expansion valve greatly acts and the suction superheat degree is not obviously changed exists, so that the adjusting precision is poor. According to the exhaust superheat control mode, a superheat interval is obtained according to a look-up table of the ambient temperature (low pressure) and the water temperature (high pressure), and when the interval is divided coarsely, the problems of poor adjustment precision and poor self-adaption exist.
In general, the current method for controlling the electronic expansion valve according to the suction superheat degree or the exhaust superheat degree mainly has the following defects:
1. the adjustment accuracy is poor. When the suction superheat degree control is adopted, the follow-up performance of the suction superheat degree is poor when the heat pump operates at a low ring temperature, the adjustment is not obviously changed, and whether the adjustment direction and the size of the opening degree of the electronic expansion valve are proper or not can not be verified in time, so that the adjustment precision is poor.
2. The target value jumps. If the target value of the exhaust superheat degree of part of control schemes is checked according to the ambient temperature and the water temperature, the target value of the exhaust superheat degree has sudden change, so that the adjusting effect is poor.
3. The adaptability is poor. The target value of the exhaust superheat degree cannot be correspondingly adjusted when the amount of the refrigerant of the system is changed according to the scheme of table lookup of the ambient temperature and the water temperature, so that the adaptability is poor.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
Therefore, an object of the present invention is to provide a method for controlling an electronic expansion valve of a heat pump air conditioner, which continuously adjusts a target exhaust superheat value controlled by the electronic expansion valve based on a pressure ratio change, thereby improving the calculation accuracy of the target exhaust superheat value, and improving the adjustment accuracy and adaptability of the electronic expansion valve during heating, thereby improving the stability of the heat pump air conditioner.
The second purpose of the invention is to provide a control device for an electronic expansion valve of a heat pump air conditioner.
The third purpose of the invention is to provide a heat pump air conditioner.
A fourth object of the invention is to propose an electronic device.
A fifth object of the invention is to propose a non-transitory computer-readable storage medium.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a control method for an electronic expansion valve of a heat pump air conditioner, including the steps of: after the pre-opening degree of the electronic expansion valve, determining the pressure ratio of the heat pump air conditioner; obtaining a target exhaust superheat degree value according to the pressure ratio; and controlling the electronic expansion valve according to the actual exhaust superheat value and the target exhaust superheat value.
According to the control method of the electronic expansion valve of the heat pump air conditioner, the pressure ratio of the heat pump air conditioner is determined after the electronic expansion valve is pre-opened; obtaining a target exhaust superheat degree value according to the pressure ratio; the electronic expansion valve is controlled according to the actual exhaust superheat value and the target exhaust superheat value, so that the target exhaust superheat value controlled by the electronic expansion valve can be continuously adjusted based on the pressure ratio change, the calculation precision of the target exhaust superheat value is improved, the adjustment precision and the adaptability of the electronic expansion valve during heating can be improved, and the stability of the heat pump air conditioner is improved.
In addition, the control method of the electronic expansion valve of the heat pump air conditioner according to the above embodiment of the invention may further have the following additional technical features:
in some examples, the target exhaust superheat value is calculated by:
DSH=K1*ln(ε)–K2*(ε)+K3,
wherein DSH is the target value of the exhaust superheat degree, epsilon is the pressure ratio, K2 is a constant, and K1 and K3 are first and second preset parameters determined according to the condensation temperature of the heat pump air conditioner.
In some examples, the first preset parameter K1 and the second preset parameter K3 are respectively determined by querying corresponding condensation temperature-parameter mapping tables, wherein when the condensation temperature is less than or equal to a first preset temperature, the K1 is a first preset value, when the condensation temperature is greater than or equal to a second preset temperature, the K1 is a second preset value, when the condensation temperature is greater than the first preset temperature and less than the second preset temperature, the K1 is greater than the first preset value and less than the second preset value, and increases as the condensation temperature increases; when the condensing temperature is less than or equal to a third preset temperature, the K3 is a third preset value, when the condensing temperature is greater than or equal to a fourth preset temperature, the K3 is a fourth preset value, when the condensing temperature is greater than the third preset temperature and less than the fourth preset temperature, the K3 is greater than the fourth preset value and less than the third preset value, and is reduced as the condensing temperature increases.
In some examples, controlling the electronic expansion valve based on the actual value of the exhaust superheat and the target value of the exhaust superheat comprises: when the actual value of the exhaust superheat degree is larger than the target value of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to increase; and when the actual value of the exhaust superheat degree is smaller than the target value of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to be reduced.
In some examples, further comprising: and verifying the target value of the exhaust superheat degree at intervals of preset time to ensure that the target value of the exhaust superheat degree is in a preset stable interval of the target value of the exhaust superheat degree.
In order to achieve the above object, an embodiment of a second aspect of the present invention proposes a control device for an electronic expansion valve of a heat pump air conditioner, comprising: the determining module is used for determining the pressure ratio of the heat pump air conditioner after the pre-opening degree of the electronic expansion valve; the calculation module is used for obtaining a target exhaust superheat degree value according to the pressure ratio; and the control module is used for controlling the electronic expansion valve according to the actual exhaust superheat value and the target exhaust superheat value.
According to the control device of the electronic expansion valve of the heat pump air conditioner, the pressure ratio of the heat pump air conditioner is determined after the electronic expansion valve is pre-opened; obtaining a target exhaust superheat degree value according to the pressure ratio; the electronic expansion valve is controlled according to the actual exhaust superheat value and the target exhaust superheat value, so that the target exhaust superheat value controlled by the electronic expansion valve can be continuously adjusted based on the pressure ratio change, the calculation precision of the target exhaust superheat value is improved, the adjustment precision and the adaptability of the electronic expansion valve during heating can be improved, and the stability of the heat pump air conditioner is improved.
In addition, the control device for the electronic expansion valve of the heat pump air conditioner according to the above embodiment of the invention may further have the following additional technical features:
in some examples, the calculation module is to calculate the exhaust superheat target value by:
DSH=K1*ln(ε)–K2*(ε)+K3,
wherein DSH is the target value of the exhaust superheat degree, epsilon is the pressure ratio, K2 is a constant, and K1 and K3 are first and second preset parameters determined according to the condensation temperature of the heat pump air conditioner.
In some examples, the first preset parameter K1 and the second preset parameter K3 are respectively determined by querying corresponding condensation temperature-parameter mapping tables, wherein when the condensation temperature is less than or equal to a first preset temperature, the K1 is a first preset value, when the condensation temperature is greater than or equal to a second preset temperature, the K1 is a second preset value, when the condensation temperature is greater than the first preset temperature and less than the second preset temperature, the K1 is greater than the first preset value and less than the second preset value, and increases as the condensation temperature increases; when the condensing temperature is less than or equal to a third preset temperature, the K3 is a third preset value, when the condensing temperature is greater than or equal to a fourth preset temperature, the K3 is a fourth preset value, when the condensing temperature is greater than the third preset temperature and less than the fourth preset temperature, the K3 is greater than the fourth preset value and less than the third preset value, and is reduced as the condensing temperature increases.
In some examples, the control module is to: when the actual value of the exhaust superheat degree is larger than the target value of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to increase; and when the actual value of the exhaust superheat degree is smaller than the target value of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to be reduced.
In some examples, the control module is to: when the actual value of the exhaust superheat degree is larger than the target value of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to increase; and when the actual value of the exhaust superheat degree is smaller than the target value of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to be reduced.
In order to achieve the above object, an embodiment of the third aspect of the present invention provides a heat pump air conditioner, including a control device for an electronic expansion valve of the heat pump air conditioner according to the embodiment of the second aspect of the present invention.
According to the heat pump air conditioner provided by the embodiment of the invention, after the pre-opening degree of the electronic expansion valve is reached, the pressure ratio is determined; obtaining a target exhaust superheat degree value according to the pressure ratio; the electronic expansion valve is controlled according to the actual exhaust superheat value and the target exhaust superheat value, so that the target exhaust superheat value controlled by the electronic expansion valve can be continuously adjusted based on the pressure ratio change, the calculation precision of the target exhaust superheat value is improved, the adjustment precision and the adaptability of the electronic expansion valve during heating can be improved, and the stability of the heat pump air conditioner is improved.
In order to achieve the above object, an embodiment of a fourth aspect of the present invention proposes an electronic apparatus including: the control method of the electronic expansion valve of the heat pump air conditioner comprises the steps of storing a control signal, executing the control signal, and controlling the electronic expansion valve of the heat pump air conditioner according to the control signal.
According to the electronic equipment provided by the embodiment of the invention, after the pre-opening degree of the electronic expansion valve is reached, the pressure ratio of the heat pump air conditioner is determined; obtaining a target exhaust superheat degree value according to the pressure ratio; the electronic expansion valve is controlled according to the actual exhaust superheat value and the target exhaust superheat value, so that the target exhaust superheat value controlled by the electronic expansion valve can be continuously adjusted based on the pressure ratio change, the calculation precision of the target exhaust superheat value is improved, the adjustment precision and the adaptability of the electronic expansion valve during heating can be improved, and the stability of the heat pump air conditioner is improved.
In order to achieve the above object, an embodiment of a fifth aspect of the present invention proposes a non-transitory computer-readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the control method of the electronic expansion valve of the heat pump air conditioner according to the embodiment of the first aspect of the present invention.
According to the non-transitory computer readable storage medium of the embodiment of the present invention, after the pre-opening degree of the electronic expansion valve, the pressure ratio of the heat pump air conditioner is determined; obtaining a target exhaust superheat degree value according to the pressure ratio; the electronic expansion valve is controlled according to the actual exhaust superheat value and the target exhaust superheat value, so that the target exhaust superheat value controlled by the electronic expansion valve can be continuously adjusted based on the pressure ratio change, the calculation precision of the target exhaust superheat value is improved, the adjustment precision and the adaptability of the electronic expansion valve during heating can be improved, and the stability of the heat pump air conditioner is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a control method of an electronic expansion valve of a heat pump air conditioner according to an embodiment of the present invention;
FIG. 2 is an exemplary plot of a condensing temperature versus parameter map according to one embodiment of the present invention;
FIG. 3 is a graphical illustration of a relationship between suction pressure and discharge superheat target in accordance with an embodiment of the invention;
fig. 4 is a block diagram illustrating a control apparatus for an electronic expansion valve of a heat pump air conditioner according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 in specific cases to those skilled in the art.
The following describes a control method and device for an electronic expansion valve of a heat pump air conditioner and the heat pump air conditioner according to an embodiment of the invention with reference to the accompanying drawings.
Fig. 1 is a flowchart of a control method of an electronic expansion valve of a heat pump air conditioner according to an embodiment of the present invention. As shown in fig. 1, the control method of the electronic expansion valve of the heat pump air conditioner comprises the following steps:
step S1: and determining the pressure ratio of the heat pump air conditioner after the pre-opening degree of the electronic expansion valve.
It can be understood that the pre-opening degree of the electronic expansion valve refers to an opening degree determined according to the current operation condition and relevant parameters of the heat pump air conditioner when the electronic expansion valve is initially opened during heating, and the heat pump air conditioner enters a steady state after the opening degree is maintained for a certain time.
Specifically, the pressure ratio of the heat pump air conditioner is determined according to the suction pressure Pe and the discharge pressure Pc of the heat pump air conditioner. The method specifically comprises the following steps: and epsilon is Pc/Pe, wherein epsilon is the pressure ratio.
Step S2: and obtaining a target value of the degree of superheat of the exhaust gas according to the pressure ratio. Specifically, during heating, after the electronic expansion valve is pre-opened, the superheat degree T of the exhaust gas is determinedDSHIn the process of adjusting the opening EXV of the electronic expansion valve, first, a target value of the superheat degree of the exhaust gas is obtained from the pressure ratio.
In one embodiment of the invention, the calculation method of the target value of the degree of superheat of the exhaust gas is as follows:
DSH=K1*ln(ε)–K2*(ε)+K3,
wherein DSH is a target value of the degree of superheat of the exhaust gas, epsilon is a pressure ratio, K2 is a known constant, and K1 and K3 are first and second preset parameters determined according to the condensation temperature of the heat pump air conditioner.
Specifically, the first preset parameter K1 and the second preset parameter K3 are respectively determined by querying corresponding condensation temperature-parameter relation mapping tables. The condensation temperature-parameter relation mapping table comprises a plurality of groups of corresponding relations between condensation temperatures and parameters, and the parameters at least comprise first preset parameters and second preset parameters. Namely, the first preset parameter or the second preset parameter corresponding to the condensation temperature can be inquired and obtained by inputting the condensation temperature, the parameter value taking accuracy is high, the accuracy of the target value of the exhaust superheat degree is improved, and the adjustment accuracy of the electronic expansion valve is further improved.
As shown in fig. 2, when the condensing temperature Tc is less than or equal to the first preset temperature Tc1, K1 is a first preset value a, when the condensing temperature Tc is greater than or equal to the second preset temperature Tc2, K1 is a second preset value b, and when the condensing temperature Tc is greater than the first preset temperature Tc1 and less than the second preset temperature Tc2, K1 is greater than the first preset value a and less than the second preset value b, and increases as the condensing temperature Tc increases.
Referring to fig. 2, when the condensing temperature Tc is less than or equal to the third preset temperature Tc3, K3 is the third preset value d, when the condensing temperature Tc is greater than or equal to the fourth preset temperature Tc4, K3 is the fourth preset value c, and when the condensing temperature Tc is greater than the third preset temperature Tc3 and less than the fourth preset temperature Tc4, K3 is greater than the fourth preset value c and less than the third preset value d, and decreases as the condensing temperature Tc increases.
As a specific example, fig. 3 shows a corresponding relationship curve of the target exhaust superheat DSH and the suction pressure Pe obtained by the above algorithm, wherein the curve corresponds to the corresponding relationship of the target exhaust superheat DSH and the suction pressure Pe from top to bottom when the condensation temperature Tc is 65 ℃, 60 ℃, 55 ℃, 50 ℃, 45 ℃, 40 ℃, 35 ℃, 30 ℃ and 25 ℃. It can be seen from fig. 3 that the target value DSH of the exhaust superheat degree changes smoothly and reasonably, has no abrupt change point, is free from the limitation of the water temperature and the ambient temperature, and has strong adaptability.
Step S3: and controlling the electronic expansion valve according to the actual exhaust superheat value and the target exhaust superheat value.
Specifically, the step S3 of controlling the electronic expansion valve according to the actual value of the exhaust superheat degree and the target value of the exhaust superheat degree includes: when the actual value of the exhaust superheat degree is larger than the target value DSH of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to increase, namely controlling the action direction of the electronic expansion valve to increase; and when the actual value of the exhaust superheat degree is smaller than the target value DSH of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to be reduced, namely controlling the action direction of the electronic expansion valve to be closed. Wherein, the electronic expansion valve adopts PID (proportional integral derivative) regulation, the regulation period can be set according to the actual requirement, such as 10 seconds, and each regulation period acts once at most, namely increases 1 time at most and decreases 1 time at most.
In one embodiment of the invention, the method further comprises: and verifying the target value of the exhaust superheat degree at intervals of preset time to ensure that the target value of the exhaust superheat degree is in a preset stable interval of the target value of the exhaust superheat degree. That is to say, the target value DSH of the exhaust superheat degree is updated in each preset time, so that the target value of the exhaust superheat degree is in a stable interval of the preset target value of the exhaust superheat degree, the accuracy of the target value of the exhaust superheat degree is favorably maintained, and the control precision of the electronic expansion valve is further improved. For example, the target value DSH is updated every 60 seconds (i.e., a predetermined time), so that the temperature of the target value DSH is within the target stability interval [ DSH, DSH +2 ].
According to the control method of the electronic expansion valve of the heat pump air conditioner, the pressure ratio of the heat pump air conditioner is determined after the electronic expansion valve is pre-opened; obtaining a target exhaust superheat degree value according to the pressure ratio; the electronic expansion valve is controlled according to the actual exhaust superheat value and the target exhaust superheat value, so that the target exhaust superheat value controlled by the electronic expansion valve can be continuously adjusted based on the pressure ratio change, the calculation precision of the target exhaust superheat value is improved, the adjustment precision and the adaptability of the electronic expansion valve during heating can be improved, and the stability of the heat pump air conditioner is improved.
The invention further provides a control device of the electronic expansion valve of the heat pump air conditioner.
Fig. 4 is a block diagram illustrating a control apparatus for an electronic expansion valve of a heat pump air conditioner according to an embodiment of the present invention. As shown in fig. 4, the control device 100 for an electronic expansion valve of a heat pump air conditioner includes: a determination module 110, a calculation module 120, and a control module 130.
The determining module 110 is configured to determine a pressure ratio of the heat pump air conditioner after the electronic expansion valve is pre-opened.
It can be understood that the pre-opening degree of the electronic expansion valve refers to an opening degree determined according to the current operation condition and relevant parameters of the heat pump air conditioner when the electronic expansion valve is initially opened during heating, and the heat pump air conditioner enters a steady state after the opening degree is maintained for a certain time.
Specifically, the pressure ratio of the heat pump air conditioner is determined according to the suction pressure Pe and the discharge pressure Pc of the heat pump air conditioner. The method specifically comprises the following steps: and epsilon is Pc/Pe, wherein epsilon is the pressure ratio.
The calculation module 120 is used for obtaining the target exhaust superheat value according to the pressure ratio. Specifically, during heating, after the electronic expansion valve is pre-opened, the superheat degree T of the exhaust gas is determinedDSHIn the process of adjusting the opening EXV of the electronic expansion valve, first, a target value of the superheat degree of the exhaust gas is obtained from the pressure ratio.
In one embodiment of the present invention, the calculation module 120 is configured to calculate the exhaust superheat target value by the following equation:
DSH=K1*ln(ε)–K2*(ε)+K3,
wherein DSH is a target value of the degree of superheat of the exhaust gas, epsilon is a pressure ratio, K2 is a constant, and K1 and K3 are first and second preset parameters determined according to the condensation temperature of the heat pump air conditioner.
Specifically, the first preset parameter K1 and the second preset parameter K3 are respectively determined by querying corresponding condensation temperature-parameter relation mapping tables. The condensation temperature-parameter relation mapping table comprises a plurality of groups of corresponding relations between condensation temperatures and parameters, and the parameters at least comprise first preset parameters and second preset parameters. Namely, the first preset parameter or the second preset parameter corresponding to the condensation temperature can be inquired and obtained by inputting the condensation temperature, the parameter value taking accuracy is high, the accuracy of the target value of the exhaust superheat degree is improved, and the adjustment accuracy of the electronic expansion valve is further improved.
When the condensing temperature is greater than or equal to the first preset temperature and less than the second preset temperature, K1 is greater than the first preset value and less than the second preset value, and increases with the increase of the condensing temperature. When the condensing temperature is less than or equal to the third preset temperature, K3 is the third preset value, when the condensing temperature is greater than or equal to the fourth preset temperature, K3 is the fourth preset value, when the condensing temperature is greater than the third preset temperature and less than the fourth preset temperature, K3 is greater than the fourth preset value and less than the third preset value, and decreases as the condensing temperature increases.
The control module 130 is configured to control the electronic expansion valve according to the actual value of the exhaust superheat degree and the target value of the exhaust superheat degree.
Specifically, the control module 130 is configured to: when the actual value of the exhaust superheat degree is larger than the target value DSH of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to increase, namely controlling the action direction of the electronic expansion valve to increase; and when the actual value of the exhaust superheat degree is smaller than the target value DSH of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to be reduced, namely controlling the action direction of the electronic expansion valve to be closed. Wherein, the electronic expansion valve adopts PID (proportional integral derivative) regulation, the regulation period can be set according to the actual requirement, such as 10 seconds, and each regulation period acts once at most, namely increases 1 time at most and decreases 1 time at most.
In one embodiment of the present invention, the apparatus 100 further comprises a verification module (not shown). The checking module is used for verifying the target value of the exhaust superheat degree at intervals of preset time, so that the target value of the exhaust superheat degree is in a preset stable range of the target value of the exhaust superheat degree. That is to say, the target value DSH of the exhaust superheat degree is updated in each preset time, so that the target value of the exhaust superheat degree is in a stable interval of the preset target value of the exhaust superheat degree, the accuracy of the target value of the exhaust superheat degree is favorably maintained, and the control precision of the electronic expansion valve is further improved. For example, the target value DSH is updated every 60 seconds (i.e., a predetermined time), so that the temperature of the target value DSH is within the target stability interval [ DSH, DSH +2 ].
It should be noted that a specific implementation manner of the control device for an electronic expansion valve of a heat pump air conditioner according to an embodiment of the present invention is similar to a specific implementation manner of the control method for an electronic expansion valve of a heat pump air conditioner according to an embodiment of the present invention, and please refer to the description of the method part specifically, and details are not described here again in order to reduce redundancy.
According to the control device of the electronic expansion valve of the heat pump air conditioner, the pressure ratio of the heat pump air conditioner is determined after the electronic expansion valve is pre-opened; obtaining a target exhaust superheat degree value according to the pressure ratio; the electronic expansion valve is controlled according to the actual exhaust superheat value and the target exhaust superheat value, so that the target exhaust superheat value controlled by the electronic expansion valve can be continuously adjusted based on the pressure ratio change, the calculation precision of the target exhaust superheat value is improved, the adjustment precision and the adaptability of the electronic expansion valve during heating can be improved, and the stability of the heat pump air conditioner is improved.
A further embodiment of the present invention further provides a heat pump air conditioner, which includes the control device for the electronic expansion valve of the heat pump air conditioner described in any one of the above embodiments of the present invention.
According to the heat pump air conditioner provided by the embodiment of the invention, after the pre-opening degree of the electronic expansion valve is reached, the pressure ratio is determined; obtaining a target exhaust superheat degree value according to the pressure ratio; the electronic expansion valve is controlled according to the actual exhaust superheat value and the target exhaust superheat value, so that the target exhaust superheat value controlled by the electronic expansion valve can be continuously adjusted based on the pressure ratio change, the calculation precision of the target exhaust superheat value is improved, the adjustment precision and the adaptability of the electronic expansion valve during heating can be improved, and the stability of the heat pump air conditioner is improved.
In addition, other configurations and functions of the heat pump air conditioner according to the embodiment of the present invention are known to those skilled in the art, and are not described in detail to reduce redundancy.
A further embodiment of the present invention also provides an electronic device, including: the control method of the electronic expansion valve of the heat pump air conditioner is realized by the aid of the storage, the processor and a computer program stored in the storage and capable of running on the processor, and the processor executes the program.
According to the electronic equipment provided by the embodiment of the invention, after the pre-opening degree of the electronic expansion valve is reached, the pressure ratio of the heat pump air conditioner is determined; obtaining a target exhaust superheat degree value according to the pressure ratio; the electronic expansion valve is controlled according to the actual exhaust superheat value and the target exhaust superheat value, so that the target exhaust superheat value controlled by the electronic expansion valve can be continuously adjusted based on the pressure ratio change, the calculation precision of the target exhaust superheat value is improved, the adjustment precision and the adaptability of the electronic expansion valve during heating can be improved, and the stability of the heat pump air conditioner is improved.
A further embodiment of the present invention also proposes a non-transitory computer-readable storage medium having stored thereon a computer program which is executed by a processor to implement the control method of the electronic expansion valve of the heat pump air conditioner described in any one of the above embodiments of the present invention.
According to the non-transitory computer readable storage medium of the embodiment of the present invention, after the pre-opening degree of the electronic expansion valve, the pressure ratio of the heat pump air conditioner is determined; obtaining a target exhaust superheat degree value according to the pressure ratio; the electronic expansion valve is controlled according to the actual exhaust superheat value and the target exhaust superheat value, so that the target exhaust superheat value controlled by the electronic expansion valve can be continuously adjusted based on the pressure ratio change, the calculation precision of the target exhaust superheat value is improved, the adjustment precision and the adaptability of the electronic expansion valve during heating can be improved, and the stability of the heat pump air conditioner is improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A control method of an electronic expansion valve of a heat pump air conditioner is characterized by comprising the following steps:
after the pre-opening degree of the electronic expansion valve, determining the pressure ratio of the heat pump air conditioner;
obtaining a target exhaust superheat degree value according to the pressure ratio;
controlling the electronic expansion valve according to the actual value of the exhaust superheat degree and the target value of the exhaust superheat degree;
the method for calculating the target value of the degree of superheat of the exhaust gas comprises the following steps:
DSH=K1*ln(ε)–K2*(ε)+K3,
wherein DSH is the target value of the exhaust superheat degree, epsilon is the pressure ratio, K2 is a constant, and K1 and K3 are first and second preset parameters determined according to the condensation temperature of the heat pump air conditioner.
2. The control method of the heat pump air conditioner electronic expansion valve according to claim 1, wherein the first preset parameter K1 and the second preset parameter K3 are respectively determined by referring to corresponding condensing temperature-parameter map tables, wherein,
when the condensation temperature is less than or equal to a first preset temperature, the K1 is a first preset value, when the condensation temperature is greater than or equal to a second preset temperature, the K1 is a second preset value, when the condensation temperature is greater than the first preset temperature and less than the second preset temperature, the K1 is greater than the first preset value and less than the second preset value, and increases as the condensation temperature increases;
when the condensing temperature is less than or equal to a third preset temperature, the K3 is a third preset value, when the condensing temperature is greater than or equal to a fourth preset temperature, the K3 is a fourth preset value, when the condensing temperature is greater than the third preset temperature and less than the fourth preset temperature, the K3 is greater than the fourth preset value and less than the third preset value, and is reduced as the condensing temperature increases.
3. The control method of the electronic expansion valve of the heat pump air conditioner as claimed in claim 1, wherein the controlling of the electronic expansion valve according to the actual value of the exhaust superheat degree and the target value of the exhaust superheat degree comprises:
when the actual value of the exhaust superheat degree is larger than the target value of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to increase;
and when the actual value of the exhaust superheat degree is smaller than the target value of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to be reduced.
4. The control method of the heat pump air conditioner electronic expansion valve according to any one of claims 1 to 3, further comprising:
and verifying the target value of the exhaust superheat degree at intervals of preset time to ensure that the target value of the exhaust superheat degree is in a preset stable interval of the target value of the exhaust superheat degree.
5. A control device for an electronic expansion valve of a heat pump air conditioner is characterized by comprising:
the determining module is used for determining the pressure ratio of the heat pump air conditioner after the pre-opening degree of the electronic expansion valve;
the calculation module is used for obtaining a target exhaust superheat degree value according to the pressure ratio;
the control module is used for controlling the electronic expansion valve according to the actual value of the exhaust superheat degree and the target value of the exhaust superheat degree;
wherein the calculation module is used for calculating the target exhaust superheat value through the following formula:
DSH=K1*ln(ε)–K2*(ε)+K3,
wherein DSH is the target value of the exhaust superheat degree, epsilon is the pressure ratio, K2 is a constant, and K1 and K3 are first and second preset parameters determined according to the condensation temperature of the heat pump air conditioner.
6. The control device for the electronic expansion valve of the heat pump air conditioner according to claim 5, wherein the first preset parameter K1 and the second preset parameter K3 are respectively determined by referring to the corresponding condensation temperature-parameter mapping table, wherein,
when the condensation temperature is less than or equal to a first preset temperature, the K1 is a first preset value, when the condensation temperature is greater than or equal to a second preset temperature, the K1 is a second preset value, when the condensation temperature is greater than the first preset temperature and less than the second preset temperature, the K1 is greater than the first preset value and less than the second preset value, and increases as the condensation temperature increases;
when the condensing temperature is less than or equal to a third preset temperature, the K3 is a third preset value, when the condensing temperature is greater than or equal to a fourth preset temperature, the K3 is a fourth preset value, when the condensing temperature is greater than the third preset temperature and less than the fourth preset temperature, the K3 is greater than the fourth preset value and less than the third preset value, and is reduced as the condensing temperature increases.
7. The control device for the electronic expansion valve of the heat pump air conditioner as claimed in claim 5, wherein the control module is configured to:
when the actual value of the exhaust superheat degree is larger than the target value of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to increase;
and when the actual value of the exhaust superheat degree is smaller than the target value of the exhaust superheat degree, controlling the opening degree of the electronic expansion valve to be reduced.
8. The control device for the electronic expansion valve of the heat pump air conditioner according to any one of claims 5 to 7, further comprising:
and the checking module is used for checking the target value of the exhaust superheat degree at intervals of preset time to ensure that the target value of the exhaust superheat degree is in a preset stable range of the target value of the exhaust superheat degree.
9. A heat pump air conditioner characterized by comprising a control device of an electronic expansion valve of the heat pump air conditioner according to any one of claims 5 to 8.
10. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the control method of the heat pump air conditioner electronic expansion valve according to any one of claims 1 to 4.
11. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the program is executed by a processor to implement the control method of the heat pump air conditioner electronic expansion valve according to any one of claims 1 to 4.
CN201910585911.8A 2019-07-01 2019-07-01 Control method and device for electronic expansion valve of heat pump air conditioner and heat pump air conditioner Active CN110388772B (en)

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CN112503811B (en) * 2020-12-10 2021-12-10 珠海格力电器股份有限公司 Control method of electronic expansion valve and heat pump system

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