CN108800466B - Control method and device of air conditioner - Google Patents

Control method and device of air conditioner Download PDF

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Publication number
CN108800466B
CN108800466B CN201810630119.5A CN201810630119A CN108800466B CN 108800466 B CN108800466 B CN 108800466B CN 201810630119 A CN201810630119 A CN 201810630119A CN 108800466 B CN108800466 B CN 108800466B
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target
air conditioner
inlet temperature
frequency
expansion valve
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CN108800466A (en
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张博博
席战利
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/50—Load

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a control method and a control device of an air conditioner, wherein the air conditioner runs in a refrigeration mode, and the method comprises the following steps: identifying that a compressor in the air conditioner operates at a lowest operating frequency; acquiring a target operation frequency of the air conditioner at the current moment; if the target operation frequency is less than the lowest operation frequency, acquiring an outdoor temperature and an indoor temperature; acquiring a target inlet temperature of an evaporator according to the outdoor temperature and the indoor temperature; according to the target inlet temperature of the evaporator, the opening degree of the electronic expansion valve is adjusted, and the technical problem that the output refrigerating capacity is larger than the indoor actual demand refrigerating capacity when the air conditioner operates at the lowest frequency in the prior art is effectively solved.

Description

Control method and device of air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and a control device of an air conditioner.
Background
In the related art, the operation modes of the inverter air conditioner are as follows: when the indoor temperature is reduced to a certain value (reaching a warm stop compensation value, generally preset to be 1-5 ℃, and different according to the setting of each manufacturer), which is lower than the preset temperature, the air conditioner can reach warm stop, namely the compressor stops running, and when the indoor temperature rises to the condition of automatic start-up along with the increase of time, the air conditioner can be restarted. And finally, in the stage before the shutdown, the compressor can operate at the minimum operable frequency, so that the refrigerating capacity of the air conditioner is reduced to the minimum to maintain the room temperature not to be reduced any more.
However, the inventors of the present application have found that the above-mentioned techniques have at least the following technical problems: when the indoor temperature is close to reaching the warm shutdown value, because the refrigerant velocity of flow is lower, in order to guarantee electronic expansion valve's target exhaust value, target exhaust superheat degree or target degree of superheat of breathing in, electronic expansion valve's aperture can constantly reduce, consequently, when outdoor temperature begins to descend, air conditioner refrigerating capacity can slowly increase, surpass indoor required refrigeration demand, cause the air conditioner to open and stop repeatedly very easily this moment, very big reduction indoor temperature thermal comfort degree, also can cause certain influence to the reliability of compressor.
Disclosure of Invention
The embodiment of the application provides a control method and a control device of an air conditioner, solves the technical problem that the output refrigerating capacity is larger than the indoor actual demand refrigerating capacity when the air conditioner operates at the lowest frequency in the prior art, and effectively improves the indoor temperature thermal comfort.
The embodiment of the application provides a control method of an air conditioner, wherein the air conditioner runs in a refrigeration mode, and the method comprises the following steps: identifying that a compressor in the air conditioner operates at a lowest operating frequency; acquiring a target operation frequency of the air conditioner at the current moment; if the target operation frequency is less than the lowest operation frequency, acquiring an outdoor temperature and an indoor temperature; acquiring a target inlet temperature of an evaporator according to the outdoor temperature and the indoor temperature; and adjusting the opening degree of the electronic expansion valve according to the target inlet temperature of the evaporator.
According to an embodiment of the present invention, the identifying that the compressor in the air conditioner operates at the lowest operating frequency includes: and obtaining the current running frequency of the compressor, comparing the current running frequency with the lowest running frequency, and determining that the compressor runs according to the lowest running frequency if the current running frequency is consistent with the lowest running frequency.
According to an embodiment of the present invention, adjusting the opening degree of the electronic expansion valve according to the target inlet temperature of the evaporator further comprises: acquiring the actual inlet temperature of the evaporator at the current moment; determining a target opening degree of the electronic expansion valve according to the actual inlet temperature and the target inlet temperature; and adjusting the electronic expansion valve according to the target opening degree.
According to an embodiment of the present invention, the determining a target opening degree of the electronic expansion valve based on the actual inlet temperature and the target inlet temperature includes: determining a first inlet temperature difference of the evaporator according to the actual inlet temperature and the target inlet temperature; determining a second inlet temperature difference value of the evaporator according to the actual inlet temperature of the evaporator at the current moment and the actual inlet temperature of the evaporator at the last moment; and determining the target opening degree of the electronic expansion valve according to the first inlet temperature difference value and the second inlet temperature difference value.
According to an embodiment of the present invention, determining a target opening degree of the electronic expansion valve further comprises: determining a target adjustment correction value of the opening of the electronic expansion valve at the current moment according to the first inlet temperature difference value and the second inlet temperature difference value; and multiplying the target adjustment correction value by a correction coefficient, and adding the target adjustment correction value and the current opening of the electronic expansion valve to obtain the target opening.
According to an embodiment of the present invention, before multiplying the target adjustment correction value by the correction coefficient, the method further includes: comparing the absolute value of the first inlet temperature difference value with a preset threshold value; if the absolute value is greater than or equal to the preset threshold value, determining that the correction coefficient is a first preset value; and if the absolute value is smaller than the preset threshold, determining that the correction coefficient is a second preset value.
According to an embodiment of the present invention, after adjusting the opening degree of the electronic expansion valve, the method further includes: continuously acquiring the current operating frequency of the air conditioner and the target operating frequency of the air conditioner at the current time; if the current operating frequency is the lowest operating frequency and the current target operating frequency is less than the lowest operating frequency, continuously adjusting the opening degree of the electronic expansion valve; and if the operating frequency at the current moment is greater than the lowest operating frequency or the target frequency at the current moment is greater than or equal to the lowest operating frequency, controlling the air conditioner to recover the initial opening degree of the electronic expansion valve.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. because when the operating frequency of the air conditioner reaches the lowest operating frequency and the target frequency is still less than the lowest operating frequency, the opening degree of the electronic expansion valve is adjusted according to the target inlet temperature of the evaporator, the technical problem that the output refrigerating capacity is greater than the indoor actual required refrigerating capacity when the air conditioner operates at the lowest frequency in the prior art is effectively solved, the indoor temperature thermal comfort is effectively improved, and the air conditioner is prevented from being repeatedly started and stopped.
2. And accurately determining the target inlet temperature of the evaporator according to the current outdoor temperature and the current indoor temperature, and further adjusting the opening of the electronic expansion valve according to the target inlet temperature of the evaporator, so that the actual inlet temperature of the evaporator is equal to the target inlet temperature, and the cold quantity of the indoor unit is reduced.
Drawings
Fig. 1 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention;
fig. 3 is a block diagram schematically illustrating a control apparatus of an air conditioner according to an embodiment of the present invention;
fig. 4 is a block diagram schematically illustrating an air conditioner according to an embodiment of the present invention.
Detailed Description
In order to solve the problem that the refrigerating capacity of the air conditioner exceeds the indoor required refrigerating requirement, under the condition that the air conditioner reaches the lowest operating frequency and the target frequency is still smaller than the lowest operating frequency, the opening degree of the electronic expansion valve is adjusted according to the current outdoor temperature and the indoor temperature, so that the inlet temperature of the evaporator is equal to the target inlet temperature, the refrigerating capacity of an indoor unit is reduced, the starting and stopping of the air conditioner frequency are effectively avoided, and the comfort of a user is improved.
For a better understanding of the above technical solutions, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example one
Fig. 1 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention. Wherein the air conditioner operates in a cooling mode. As shown in fig. 1, the method for controlling an air conditioner according to the embodiment of the present invention includes the following steps:
s101: and identifying that the compressor in the air conditioner operates according to the lowest operation frequency.
According to one embodiment of the present invention, identifying that a compressor in an air conditioner is operating at a lowest operating frequency comprises: and obtaining the current running frequency of the compressor, comparing the current running frequency with the lowest running frequency, and determining that the compressor runs according to the lowest running frequency if the current running frequency is consistent with the lowest running frequency.
It should be understood that as the air conditioner on time increases, the air conditioner cooling capacity increases, the compressor may gradually decrease from the highest frequency when the air conditioner is initially turned on, when the indoor temperature decreases to near the preset temperature, the frequency of the compressor may decrease to the lowest operating frequency, and when the operating frequency of the air conditioner compressor decreases to the lowest frequency, the target operating frequency is still lower than the lowest operating frequency, which indicates that the capacity of the air conditioner output at this time is greater than the cooling capacity required in the indoor space.
That is to say, in the air conditioner refrigeration mode operation process, the operation frequency of the compressor in the air conditioner is obtained in real time, the operation frequency at the current moment is compared with the lowest operation frequency, and when the operation frequency at the current moment is consistent with the lowest operation frequency, the compressor is determined to operate according to the lowest frequency.
S102: and acquiring the target operation frequency of the air conditioner at the current moment.
And the target operation frequency is the target frequency of the next moment when the air conditioner sends the air conditioner to the compressor.
S103: and if the target operation frequency is less than the lowest operation frequency, acquiring the outdoor temperature and the indoor temperature.
It should be understood that after the target operating frequency is acquired, the target frequency is compared with the lowest frequency, and if the target frequency is greater than or equal to the lowest operating frequency, the compressor is controlled to operate at the target frequency, and if the target frequency is less than the lowest operating frequency, the outdoor temperature and the indoor temperature are acquired.
S104: and acquiring a target inlet temperature of the evaporator according to the outdoor temperature and the indoor temperature.
S105: and adjusting the opening degree of the electronic expansion valve according to the target inlet temperature of the evaporator.
Specifically, in the process of air conditioner refrigeration operation, the current operation frequency of a compressor in an air conditioner is obtained in real time, whether the compressor operates according to the lowest operation frequency is identified, when the compressor operates according to the lowest operation frequency, the target operation frequency of the current moment of the air conditioner is obtained, whether the target operation frequency is smaller than the lowest operation frequency is judged, when the target frequency is smaller than the lowest operation frequency, the outdoor temperature and the indoor temperature are obtained, the target inlet temperature of an evaporator is obtained according to the outdoor temperature and the indoor temperature, and the opening degree of an electronic expansion valve is adjusted according to the target inlet temperature of the evaporator.
Therefore, when the running frequency of the compressor in the air conditioner is the lowest running frequency and the target frequency is still less than the lowest frequency, the target inlet temperature of the evaporator can be determined according to the current outdoor temperature and the current indoor temperature, the opening degree of the electronic expansion valve is adjusted according to the target inlet temperature of the evaporator, the actual inlet temperature of the evaporator is equal to the target inlet temperature, namely the target inlet temperature is changed under the condition that the frequency of the compressor is not changed, the cold quantity in the indoor unit reaches the target cold quantity, and the repeated starting and stopping of the compressor caused by the fact that the indoor unit is stopped at the temperature in advance is avoided. Meanwhile, the opening degree of the electronic expansion valve is increased, the compressor does not need to be started or stopped, and the power consumption is greatly reduced compared with that of a common control mode.
According to an embodiment of the present invention, acquiring the target inlet temperature Tco of the evaporator according to the outdoor temperature T4 and the indoor temperature T1 may further include: a table lookup approach or an equation approach.
Wherein the target inlet temperature of the corresponding evaporator can be looked up according to table 1.
TABLE 1
Figure BDA0001700293710000041
It should be understood that when there is no corresponding outdoor temperature T4 or indoor temperature T1 in table 1, the target inlet temperature Tco of the evaporator may be obtained by calculation through linear interpolation.
In addition, the target inlet temperature of the evaporator may also be calculated by the following formula:
Tco＝0.475*T1+0.479*T4-1.66
according to an embodiment of the present invention, adjusting the opening degree of the electronic expansion valve according to a target inlet temperature of the evaporator further comprises: acquiring the actual inlet temperature of the evaporator at the current moment; determining a target opening degree of the electronic expansion valve according to the actual inlet temperature and the target inlet temperature; and adjusting the electronic expansion valve according to the target opening degree.
Specifically, determining a target opening degree of the electronic expansion valve according to the actual inlet temperature and the target inlet temperature includes: determining a first inlet temperature difference T of the evaporator according to the actual inlet temperature Tc and the target inlet temperature Tco, wherein T is Tc-Tco; actual inlet temperature Tc at the moment of the evaporatornAnd the actual inlet temperature Tc at the moment on the evaporatorn-1Determining a second inlet temperature difference Δ Tc of the evaporator, i.e., Δ Tc ═ Tcn-Tcn-1(ii) a And determining the target opening degree of the electronic expansion valve according to the first inlet temperature difference T and the second inlet temperature difference delta Tc.
Further, determining a target opening degree of the electronic expansion valve further comprises: determining a target adjustment correction value delta Li of the opening of the electronic expansion valve at the current moment according to the first inlet temperature difference T and the second inlet temperature difference delta Tc; and multiplying the target adjustment correction value delta Li by the correction coefficient beta, and adding the target adjustment correction value delta Li and the current opening L of the electronic expansion valve to obtain the target opening Lo.
The target adjustment correction value Δ Li can be obtained by referring to table 2.
TABLE 2
Figure BDA0001700293710000051
Further, before multiplying the target adjustment correction value Δ Li by the correction coefficient β, the method further includes: comparing the absolute value of the first inlet temperature difference T with a preset threshold value; if the absolute value is greater than or equal to a preset threshold value, determining that the correction coefficient beta is a first preset value; and if the absolute value is smaller than the preset threshold value, determining the correction coefficient beta as a second preset value.
The preset threshold is 6, the correction coefficient β is a first preset value of 25, and the correction coefficient β is a second preset value of 15, that is, when | T | ═ Tc-Tco | ≧ 6, β ═ 25; when | T | ═ Tc-Tco | < 6, β ═ 15.
Specifically, the current outdoor temperature T4 and the indoor temperature T1 are obtained, the target inlet temperature Tco of the evaporator is obtained through table lookup or formula calculation, then the current actual inlet temperature of the evaporator and the inlet temperature at the previous moment are obtained, wherein the time TM can be controlled as a unit at the previous moment, TM is more than or equal to 180s and less than or equal to 210s, at this time, the first inlet temperature difference T and the second inlet temperature difference Δ Tc are obtained, then table lookup is performed to obtain a target adjustment correction value Δ Li, a correction coefficient β is determined according to the first inlet temperature difference T, then the target adjustment correction value Δ Li is multiplied by the correction coefficient β and added to the opening of the current electronic expansion valve to obtain the opening of the target electronic expansion valve, that is, Lo is L + Δ Li × β, and the electronic expansion valve is adjusted according to the target opening Lo.
According to an embodiment of the present invention, when the outdoor temperature T4 is much higher than the indoor temperature T1, the difference between the indoor temperature T1 and the target inlet temperature of the evaporator is larger because heat is transferred from the outdoor to the indoor, and therefore, when the outdoor temperature T4 is less than or equal to the indoor temperature T1, the target inlet temperature of the evaporator is maintained at the outdoor temperature T4, so that the amount of cold absorbed by the refrigerant from the outdoor is reduced as much as possible.
For example, when the preset temperature of the air conditioner is 28 ℃, the air conditioner is operated for a period of time, the frequency of the compressor is reduced to the lowest operation frequency, the current actual inlet opening L of the electronic expansion valve is 100, the current indoor temperature T1 is 26 ℃, the outdoor temperature T4 is 29 ℃, the target inlet temperature Tco of the evaporator is 24.5 ℃, and the current actual inlet temperature Tc of the evaporator is detectednAt 18 ℃ and the actual inlet temperature Tc at the previous momentn-1At 19 ℃, T ═ Tc-Tco ═ 6.5 ℃, Δ Tc ═ Tcn-Tcn-1If the opening degree adjustment correction value Δ Li of the electronic expansion valve is equal to 5 ℃ at 1 ℃, the target opening degree should be: lo ═ L +. DELTA.li × β ═ 100+5 × 25 ═ 225, in steps.
According to an embodiment of the present invention, after adjusting the opening degree of the electronic expansion valve, the method further includes: continuously acquiring the current operating frequency of the air conditioner and the target operating frequency of the air conditioner at the current time; if the operation frequency at the current moment is the lowest operation frequency and the target operation frequency at the current moment is less than the lowest operation frequency, continuously adjusting the opening degree of the electronic expansion valve; and if the operating frequency at the current moment is greater than the lowest operating frequency or the target frequency at the current moment is greater than or equal to the lowest operating frequency, controlling the air conditioner to recover the initial opening degree of the electronic expansion valve.
That is, after the opening degree of the electronic expansion valve is adjusted, the operating frequency of the air conditioner at the current moment and the target operating frequency of the air conditioner at the current moment are continuously acquired, if the operating frequency of the air conditioner at the current moment is the lowest operating frequency and the target operating frequency of the air conditioner at the current moment is less than the lowest operating frequency, the opening degree of the electronic expansion valve is continuously adjusted, and if the operating frequency of the air conditioner at the current moment is greater than the lowest operating frequency or the target frequency of the air conditioner at the current moment is greater than or equal to the lowest operating frequency, the air conditioner is controlled to recover the initial opening degree of the electronic expansion valve, and thus the air.
According to an embodiment of the present invention, as shown in fig. 2, the method for controlling an air conditioner of the present invention includes the steps of:
s201: and starting the air conditioner to operate.
S202: and controlling the air conditioner to operate in a normal refrigeration mode.
S203: and acquiring the current operating frequency of the air conditioner.
S204: and judging whether the current operating frequency is the lowest operating frequency.
If yes, go to step S205; if not, return to step S202.
S205: and acquiring the current target operating frequency of the air conditioner.
S206: and judging whether the target operation frequency is less than the lowest operation frequency.
If yes, go to step S207; if not, return to step S202.
S207: and acquiring the current outdoor temperature and the current indoor temperature, and determining the target inlet temperature of the evaporator according to the indoor temperature and the outdoor temperature.
S208: the electronic expansion valve is adjusted according to a target inlet temperature of the evaporator.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages: because when the operating frequency of the air conditioner reaches the lowest operating frequency and the target frequency is still less than the lowest operating frequency, the opening degree of the electronic expansion valve is adjusted according to the target inlet temperature of the evaporator, the technical problem that the output refrigerating capacity is greater than the indoor actual required refrigerating capacity when the air conditioner operates at the lowest frequency in the prior art is effectively solved, the indoor temperature thermal comfort is effectively improved, and the air conditioner is prevented from being repeatedly started and stopped. Meanwhile, the target inlet temperature of the evaporator is accurately determined according to the current outdoor temperature and the current indoor temperature, and then the opening degree of the electronic expansion valve is adjusted according to the target inlet temperature of the evaporator, so that the actual inlet temperature of the evaporator is equal to the target inlet temperature, and the cold quantity of the indoor unit is reduced.
Based on the same inventive concept, the embodiment of the invention also provides a system corresponding to the method in the first embodiment, which is shown in the second embodiment.
Example two
Fig. 3 is a block diagram illustrating a control apparatus of an air conditioner according to an embodiment of the present invention. As shown in fig. 3, a control device 100 for an air conditioner according to an embodiment of the present invention includes: an identification module 10, a first acquisition module 20, a second acquisition module 30, a third acquisition module 40 and a control module 50.
The identification module 10 is used for identifying that the compressor in the air conditioner operates according to the lowest operation frequency; the first obtaining module 20 is configured to obtain a target operating frequency of the air conditioner at a current time; the second obtaining module 30 is configured to obtain an outdoor temperature and an indoor temperature when the target operating frequency is less than the lowest operating frequency; the third obtaining module 40 is used for obtaining a target inlet temperature of the evaporator according to the outdoor temperature and the indoor temperature; the control module 50 is configured to adjust an opening of the electronic expansion valve according to a target inlet temperature of the evaporator.
Further, the identification module 10 is further configured to: and obtaining the current running frequency of the compressor, comparing the current running frequency with the lowest running frequency, and determining that the compressor runs according to the lowest running frequency if the current running frequency is consistent with the lowest running frequency.
Further, the control module 50 is further configured to: acquiring the actual inlet temperature of the evaporator at the current moment; determining a target opening degree of the electronic expansion valve according to the actual inlet temperature and the target inlet temperature; and adjusting the electronic expansion valve according to the target opening degree.
Further, the control module 50 is further configured to: determining a first inlet temperature difference of the evaporator according to the actual inlet temperature and the target inlet temperature; determining a second inlet temperature difference value of the evaporator according to the actual inlet temperature of the evaporator at the current moment and the actual inlet temperature of the evaporator at the last moment; and determining the target opening degree of the electronic expansion valve according to the first inlet temperature difference value and the second inlet temperature difference value.
Further, the control module 50 is further configured to: determining a target adjustment correction value of the opening of the electronic expansion valve at the current moment according to the first inlet temperature difference value and the second inlet temperature difference value; and multiplying the target adjustment correction value by the correction coefficient, and adding the target adjustment correction value and the current opening of the electronic expansion valve to obtain the target opening.
Further, the control module 50 is further configured to: comparing the absolute value of the first inlet temperature difference value with a preset threshold value; if the absolute value is greater than or equal to a preset threshold value, determining that the correction coefficient is a first preset value; and if the absolute value is smaller than the preset threshold value, determining the correction coefficient as a second preset value.
Further, the control module 50 is further configured to: continuously acquiring the current operating frequency of the air conditioner and the target operating frequency of the air conditioner at the current time; if the operating frequency at the current moment is the lowest operating frequency and the target operating frequency at the current moment is less than the lowest operating frequency, continuously adjusting the opening degree of the electronic expansion valve; and if the operating frequency at the current moment is greater than the lowest operating frequency or the target frequency at the current moment is greater than or equal to the lowest operating frequency, controlling the air conditioner to recover the initial opening degree of the electronic expansion valve.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages: because when the operating frequency of the air conditioner reaches the lowest operating frequency and the target frequency is still less than the lowest operating frequency, the opening degree of the electronic expansion valve is adjusted according to the target inlet temperature of the evaporator, the technical problem that the output refrigerating capacity is greater than the indoor actual required refrigerating capacity when the air conditioner operates at the lowest frequency in the prior art is effectively solved, the indoor temperature thermal comfort is effectively improved, and the air conditioner is prevented from being repeatedly started and stopped. Meanwhile, the target inlet temperature of the evaporator is accurately determined according to the current outdoor temperature and the current indoor temperature, and then the opening degree of the electronic expansion valve is adjusted according to the target inlet temperature of the evaporator, so that the actual inlet temperature of the evaporator is equal to the target inlet temperature, and the cold quantity of the indoor unit is reduced.
Since the system described in the second embodiment of the present invention is a system used for implementing the method of the first embodiment of the present invention, based on the method described in the first embodiment of the present invention, a person skilled in the art can understand the specific structure and the deformation of the system, and thus the detailed description is omitted here. All systems adopted by the method of the first embodiment of the present invention are within the intended protection scope of the present invention.
In order to achieve the above object, the present invention further provides an air conditioner, as shown in fig. 4, an air conditioner 200 includes a control device 100 of the air conditioner.
To achieve the above object, the present invention also proposes a computer-readable storage medium having stored thereon a control program of an air conditioner, which when executed by a processor implements the aforementioned control method of the air conditioner.
In order to achieve the above object, the present invention further provides an apparatus, which includes a memory, a processor, and a control program of an air conditioner stored in the memory and executable on the processor, wherein the processor implements the aforementioned control method of the air conditioner when executing the control program of the air conditioner.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (11)

1. A control method of an air conditioner, wherein the air conditioner is operated in a cooling mode, the method comprising the steps of:
identifying that a compressor in the air conditioner operates at a lowest operating frequency;
acquiring a target operation frequency of the air conditioner at the current moment;
if the target operation frequency is less than the lowest operation frequency, acquiring an outdoor temperature and an indoor temperature;
acquiring a target inlet temperature of an evaporator according to the outdoor temperature and the indoor temperature;
adjusting the opening degree of an electronic expansion valve according to the target inlet temperature of the evaporator;
wherein, according to the target inlet temperature of evaporimeter, adjust the aperture of electronic expansion valve, still include: acquiring the actual inlet temperature of the evaporator at the current moment; determining a target opening degree of the electronic expansion valve according to the actual inlet temperature and the target inlet temperature; adjusting the electronic expansion valve according to the target opening degree;
determining a target opening degree of the electronic expansion valve according to the actual inlet temperature and the target inlet temperature, including: determining a first inlet temperature difference of the evaporator according to the actual inlet temperature and the target inlet temperature; determining a second inlet temperature difference value of the evaporator according to the actual inlet temperature of the evaporator at the current moment and the actual inlet temperature of the evaporator at the last moment; and determining a target adjustment correction value of the electronic expansion valve at the current moment according to the first inlet temperature difference value and the second inlet temperature difference value, multiplying the target adjustment correction value by a correction coefficient, adding the target adjustment correction value and the correction coefficient to the current opening of the electronic expansion valve, and determining the target opening of the electronic expansion valve.
2. The method for controlling an air conditioner according to claim 1, wherein the identifying that a compressor in the air conditioner is operated at a lowest operation frequency comprises:
and obtaining the current running frequency of the compressor, comparing the current running frequency with the lowest running frequency, and determining that the compressor runs according to the lowest running frequency if the current running frequency is consistent with the lowest running frequency.
3. The control method of an air conditioner according to claim 1, wherein before multiplying the target adjustment correction value by a correction coefficient, further comprising:
comparing the absolute value of the first inlet temperature difference value with a preset threshold value;
if the absolute value is greater than or equal to the preset threshold value, determining that the correction coefficient is a first preset value;
and if the absolute value is smaller than the preset threshold, determining that the correction coefficient is a second preset value.
4. The method of claim 1, further comprising, after adjusting the opening degree of the electronic expansion valve:
continuously acquiring the current operating frequency of the air conditioner and the target operating frequency of the air conditioner at the current time;
if the current operating frequency is the lowest operating frequency and the current target operating frequency is less than the lowest operating frequency, continuously adjusting the opening degree of the electronic expansion valve;
and if the operating frequency at the current moment is greater than the lowest operating frequency or the target frequency at the current moment is greater than or equal to the lowest operating frequency, controlling the air conditioner to recover the initial opening degree of the electronic expansion valve.
5. A control apparatus of an air conditioner, wherein the air conditioner is operated in a cooling mode, the apparatus comprising:
the identification module is used for identifying that the compressor in the air conditioner operates according to the lowest operation frequency;
the first acquisition module is used for acquiring the target operation frequency of the air conditioner at the current moment;
the second acquisition module is used for acquiring the outdoor temperature and the indoor temperature when the target operation frequency is less than the lowest operation frequency;
the third acquisition module is used for acquiring a target inlet temperature of the evaporator according to the outdoor temperature and the indoor temperature;
the control module is used for adjusting the opening of the electronic expansion valve according to the target inlet temperature of the evaporator;
wherein the control module is further configured to: acquiring the actual inlet temperature of the evaporator at the current moment; determining a target opening degree of the electronic expansion valve according to the actual inlet temperature and the target inlet temperature; adjusting the electronic expansion valve according to the target opening degree;
the control module is further configured to: determining a first inlet temperature difference of the evaporator according to the actual inlet temperature and the target inlet temperature; determining a second inlet temperature difference value of the evaporator according to the actual inlet temperature of the evaporator at the current moment and the actual inlet temperature of the evaporator at the last moment; determining a target opening degree of the electronic expansion valve according to the first inlet temperature difference value and the second inlet temperature difference value;
wherein the control module is further configured to: determining a target adjustment correction value of the opening of the electronic expansion valve at the current moment according to the first inlet temperature difference value and the second inlet temperature difference value; and multiplying the target adjustment correction value by a correction coefficient, and adding the target adjustment correction value and the current opening of the electronic expansion valve to obtain the target opening.
6. The control device of the air conditioner according to claim 5, wherein the identification module is further configured to:
and obtaining the current running frequency of the compressor, comparing the current running frequency with the lowest running frequency, and determining that the compressor runs according to the lowest running frequency if the current running frequency is consistent with the lowest running frequency.
7. The control device of the air conditioner according to claim 5, wherein the control module is further configured to:
comparing the absolute value of the first inlet temperature difference value with a preset threshold value;
if the absolute value is greater than or equal to the preset threshold value, determining that the correction coefficient is a first preset value;
and if the absolute value is smaller than the preset threshold, determining that the correction coefficient is a second preset value.
8. The control device of the air conditioner according to claim 6, wherein the control module is further configured to:
continuously acquiring the current operating frequency of the air conditioner and the target operating frequency of the air conditioner at the current time;
if the current operating frequency is the lowest operating frequency and the current target operating frequency is less than the lowest operating frequency, continuously adjusting the opening degree of the electronic expansion valve;
and if the operating frequency at the current moment is greater than the lowest operating frequency or the target frequency at the current moment is greater than or equal to the lowest operating frequency, controlling the air conditioner to recover the initial opening degree of the electronic expansion valve.
9. A computer-readable storage medium, on which a control program of an air conditioner is stored, characterized in that the program, when executed by a processor, implements the control method of the air conditioner according to any one of claims 1 to 4.
10. An apparatus comprising a memory, a processor, and a control program of an air conditioner stored in the memory and executable on the processor, wherein the processor implements the control method of the air conditioner according to any one of claims 1 to 4 when executing the control program of the air conditioner.
11. An air conditioner characterized by comprising the control device of the air conditioner according to any one of claims 5 to 8.
CN201810630119.5A 2018-06-19 2018-06-19 Control method and device of air conditioner Active CN108800466B (en)

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