CN112050431A - Control method and device for fixed-frequency air conditioner and fixed-frequency air conditioner - Google Patents
Control method and device for fixed-frequency air conditioner and fixed-frequency air conditioner Download PDFInfo
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- CN112050431A CN112050431A CN201910484870.3A CN201910484870A CN112050431A CN 112050431 A CN112050431 A CN 112050431A CN 201910484870 A CN201910484870 A CN 201910484870A CN 112050431 A CN112050431 A CN 112050431A
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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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
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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
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
Abstract
The application relates to a control method and device for a fixed-frequency air conditioner and the fixed-frequency air conditioner, and belongs to the technical field of air conditioners. The method comprises the following steps: obtaining the cold outlet temperature of the condenser; obtaining real-time exhaust temperature according to a preset relation between the cold outlet temperature and the real-time exhaust temperature of the compressor; and controlling the air conditioner to defrost under the condition that the real-time exhaust temperature change rate of the real-time exhaust temperature meets a first preset condition. The control device for the fixed-frequency air conditioner and the fixed-frequency air conditioner are further provided. The beneficial effect of this disclosure: the real-time exhaust temperature of the compressor is obtained through the cold outlet temperature calculation of the condenser, the real-time exhaust temperature is closer to the actual exhaust temperature of the compressor, the detection precision of the change rate of the exhaust temperature is improved, and therefore the defrosting effect of the air conditioner is improved.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to a control method and device for a fixed-frequency air conditioner and the fixed-frequency air conditioner.
Background
Under the condition that the outdoor environment temperature is lower in winter, the air conditioner is started to heat, the heat exchanger of the outdoor unit of the air conditioner begins to frost when the temperature is lower than the corresponding dew point temperature, the air inlet resistance of the outdoor side is increased along with the increase of the thickness of a frost layer, the heat exchange resistance between the fins and the copper pipe and the air is increased, and the heat exchange capacity is gradually reduced. At present, an air conditioner is controlled to defrost by detecting the exhaust temperature change rate of a compressor so as to improve the heat exchange capacity of the air conditioner.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: the fixed-frequency air conditioner generally adopts a compressor temperature protector to detect the exhaust temperature of a compressor, but oil stain or dust and the like are attached to the surface of a protector element along with the lapse of service time, so that the difference between the temperature detected by the protector and the actual temperature is increased due to the increased heat transfer coefficient, the detection precision of the exhaust temperature change rate is influenced, and the defrosting effect of the air conditioner is poor.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a control method and a control device for a fixed-frequency air conditioner and the fixed-frequency air conditioner, so that the technical problem that the defrosting effect of the air conditioner is poor due to the fact that the difference between the detected temperature and the actual temperature of a protector becomes large and the detection precision of the change rate of the exhaust temperature is influenced due to the fact that the heat transfer coefficient of the protector of an air conditioner compressor becomes large is solved.
In some embodiments, the method comprises:
obtaining the cold outlet temperature of the condenser;
obtaining real-time exhaust temperature according to a preset relation between the cold outlet temperature and the real-time exhaust temperature of the compressor;
and controlling the air conditioner to defrost under the condition that the real-time exhaust temperature change rate of the real-time exhaust temperature meets a first preset condition.
In some embodiments, the apparatus comprises:
the acquisition module is configured to acquire the cold outlet temperature of the condenser and acquire the real-time exhaust temperature according to the preset relation between the cold outlet temperature and the real-time exhaust temperature of the compressor; and
the control module is configured to control the air conditioner to defrost under the condition that the real-time exhaust temperature change rate of the real-time exhaust temperature meets a first preset condition.
In some embodiments, the fixed-frequency air conditioner comprises the control device for the fixed-frequency air conditioner.
The control method and the control device for the fixed-frequency air conditioner and the fixed-frequency air conditioner provided by the embodiment of the disclosure can realize the following technical effects:
the real-time exhaust temperature of the compressor is obtained through the cold outlet temperature calculation of the condenser, the compressor protector with the increased heat transfer coefficient is not required to be used for detecting the exhaust temperature of the compressor, the real-time exhaust temperature is closer to the actual exhaust temperature of the compressor, the detection precision of the change rate of the exhaust temperature is improved, and therefore the defrosting effect of the air conditioner is improved.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic flowchart of a control method for a fixed-frequency air conditioner according to an embodiment of the disclosure;
fig. 2 is a schematic flowchart of a control method for a fixed-frequency air conditioner according to an embodiment of the disclosure;
fig. 3 is a schematic flowchart of a control method for a fixed-frequency air conditioner according to an embodiment of the disclosure;
fig. 4 is a schematic device diagram of a control device for a fixed-frequency air conditioner according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an electronic device provided in an embodiment of the present disclosure.
Reference numerals:
40: an acquisition module; 41: a control module; 50: a processor; 51: a memory; 52: a communication interface; 53: a bus.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The embodiment of the present disclosure provides a control method for a fixed-frequency air conditioner, as shown in fig. 1, including the following steps:
s101: the cold exit temperature of the condenser is obtained.
Optionally, the cooling temperature is detected by a temperature sensor disposed at the liquid outlet of the condenser. The cold outlet temperature is the temperature at the outlet of the condenser.
S102: and obtaining the real-time exhaust temperature according to the preset relation between the cold outlet temperature and the real-time exhaust temperature of the compressor.
Optionally, the preset relationship is:
Td＝kc×Tc+ΔTc
wherein, TdFor real-time exhaust temperature, TcTo cool the temperature, kcIs the proportional coefficient of cold-leaving temperature, Δ TcIs a cold-out temperature compensation constant.
Optionally, the cold-out temperature proportionality coefficient k in the preset relation is obtained by performing system test on the fixed-frequency air conditionercAnd cold exit temperature compensation constant Δ Tc. For example, when the surfaces of the compressor and the compressor protector element are clean and the refrigerant is sufficient, the first discharge temperature T of the compressor at different times is obtained by the compressor protector elementd1And a second exhaust temperature Td2And T isd1Is not equal to Td2And a first exhaust temperature T is obtained by a temperature sensor arranged at a liquid outlet of the condenserd1First cold outlet temperature T of the corresponding condenserc1And a second exhaust temperature Td2Second cold exit temperature T of the corresponding condenserc2. Will Td1、Td2、Tc1And Tc2Substituting into a preset relation to obtain a cold-outlet temperature proportional coefficient kcAnd cold exit temperature compensation constant Δ Tc. The obtained cold-out temperature proportionality coefficient kcAnd cold exit temperature compensation constant Δ TcSubstituted into a predetermined relationship for the discharge temperature T of the compressordAnd (4) calculating.
Optionally, the cold-out temperature proportionality coefficient k in the preset relationcAnd cold exit temperature compensation constant Δ TcRespectively, the average cold-out temperature proportionality coefficient obtained by carrying out a plurality of times of system tests on the fixed-frequency air conditioner
And average cold exit temperature compensation constant
Namely:
wherein k iscnThe proportional coefficient of cold discharge temperature, delta T, obtained by the system test of the fixed-frequency air conditioner for the nth timecnThe constant is the cold-out temperature compensation constant obtained by carrying out the system test on the constant-frequency air conditioner for the nth time, wherein n is the number of times of carrying out the system test on the constant-frequency air conditioner, and n is more than or equal to 2.
The proportional coefficient k of the cold outlet temperature in the preset relationcSet as the proportional coefficient of the average cold-out temperature
Will cool off the temperature compensation constant Δ TcSet as the average cold exit temperature compensation constant
Can reduce the error of single system test and improve the proportional coefficient k of cold outlet temperaturecAnd cold exit temperature compensation constant Δ TcThe value taking precision is improved, and the accuracy of real-time exhaust temperature calculation of the compressor is improved.
S103: and controlling the air conditioner to defrost under the condition that the real-time exhaust temperature change rate of the real-time exhaust temperature meets a first preset condition.
When the air conditioner is in a heating mode, the heat exchanger of the air conditioner external unit begins to frost under the condition that the temperature is lower than the corresponding dew point temperature, the air inlet resistance of the outdoor side is increased along with the increase of the thickness of a frost layer, the heat exchange resistance between the fins and the copper pipe and the air is increased, the heat exchange capacity is gradually reduced, and the real-time exhaust temperature change rate of the compressor is changed. The real-time exhaust temperature change rate of the compressor is used as a judgment basis for defrosting of the fixed-frequency air conditioner, so that the air conditioner can defrost in time, and the heat exchange capacity of the air conditioner is improved.
Optionally, the first preset condition is: the real-time exhaust temperature change rate is greater than or equal to a preset exhaust temperature change rate. And when the real-time exhaust temperature change rate is greater than or equal to the preset exhaust temperature change rate, indicating that the outdoor heat exchanger of the fixed-frequency air conditioner is frosted and needing defrosting operation.
Optionally, the preset exhaust temperature change rate is obtained by performing a system test on the fixed-frequency air conditioner. For example, in a system test of an air conditioner, a defrosting condition satisfying the air conditioner is created, and a variation rate of an exhaust temperature of a compressor under the defrosting condition is detected as a preset exhaust temperature variation rate.
In the embodiment, the real-time exhaust temperature of the compressor is obtained through the cold outlet temperature calculation of the condenser, the compressor protector with the enlarged heat transfer coefficient is not required to be used for detecting the exhaust temperature of the compressor, the real-time exhaust temperature is closer to the actual exhaust temperature of the compressor, the detection precision of the change rate of the exhaust temperature is improved, and therefore the defrosting effect of the air conditioner is improved.
In some embodiments, as shown in fig. 2, there is provided a control method for a fixed-frequency air conditioner, including the steps of:
s201: the cold exit temperature of the condenser is obtained.
S202: and obtaining the real-time exhaust temperature according to the preset relation between the cold outlet temperature and the real-time exhaust temperature of the compressor.
S203: and controlling the air conditioner to defrost under the condition that the real-time exhaust temperature change rate of the real-time exhaust temperature meets a first preset condition and the real-time exhaust temperature meets a second preset condition.
When the heat exchanger of the air conditioner external unit is frosted, the real-time exhaust temperature change rate of the compressor is changed, and meanwhile, the real-time exhaust temperature is also changed. The real-time exhaust temperature change rate and the real-time exhaust temperature of the compressor are jointly used as the judgment basis for defrosting of the fixed-frequency air conditioner, the accuracy of defrosting judgment of the air conditioner is improved, the air conditioner can defrost in time, and the heat exchange capacity of the air conditioner is improved.
Optionally, the second preset condition is: the real-time exhaust temperature at the current moment is less than the real-time exhaust temperature at the previous moment. When the real-time exhaust temperature at the current moment is lower than the real-time exhaust temperature at the previous moment, the frosting of the outdoor heat exchanger of the fixed-frequency air conditioner is indicated, and the defrosting operation is required.
In the embodiment, the real-time exhaust temperature change rate and the real-time exhaust temperature of the compressor are jointly used as the judgment basis for defrosting of the fixed-frequency air conditioner, so that the accuracy of defrosting judgment of the air conditioner is improved, the air conditioner can defrost in time, and the defrosting effect of the air conditioner is improved.
In some embodiments, as shown in fig. 3, there is provided a control method for a fixed-frequency air conditioner, including the steps of:
s301: the cold exit temperature of the condenser is obtained.
S302: and obtaining the real-time exhaust temperature according to the preset relation between the cold outlet temperature and the real-time exhaust temperature of the compressor.
S303: and obtaining the real-time exhaust temperature change rate after the air conditioner heating operation is performed for a preset time.
Optionally, the obtaining of the real-time exhaust temperature change rate is calculated according to the following formula, including:
and K is the real-time exhaust temperature change rate, delta T is the real-time exhaust temperature change value in the preset detection period, and delta T is the preset detection period.
Optionally, the preset detection period Δ t is 8s-12s (seconds), for example, 8s, 10s, 12 s. The accuracy of the real-time exhaust temperature change rate calculation can be improved.
When the air conditioner is started to heat, the real-time exhaust temperature change rate of the compressor is greatly changed, and at the moment, the outdoor heat exchanger does not begin to frost. Therefore, in order to accurately judge the frosting condition of the outdoor heat exchanger by using the real-time exhaust temperature change rate of the compressor, the real-time exhaust temperature change rate of the compressor is obtained after the air conditioner heating operation is carried out for the preset time.
Optionally, the preset time is 10min-20min (minutes), e.g., 10min, 18min, 20 min. The accuracy of judging the frosting condition of the outdoor heat exchanger by utilizing the real-time exhaust temperature change rate of the compressor can be improved.
S304: and controlling the air conditioner to defrost under the condition that the real-time exhaust temperature change rate is greater than or equal to the preset exhaust temperature change rate and the real-time exhaust temperature at the current moment is less than the real-time exhaust temperature at the previous moment.
And when the real-time exhaust temperature change rate is greater than or equal to the preset exhaust temperature change rate and the real-time exhaust temperature at the current moment is less than the real-time exhaust temperature at the previous moment, indicating that the outdoor heat exchanger of the fixed-frequency air conditioner is seriously frosted, and controlling the air conditioner to defrost.
In the embodiment, the real-time exhaust temperature change rate and the real-time exhaust temperature of the compressor are jointly used as the judgment basis for defrosting of the fixed-frequency air conditioner, so that the accuracy of defrosting judgment of the air conditioner is improved, the air conditioner can defrost in time, and the heat exchange capacity of the fixed-frequency air conditioner is improved.
The embodiment of the present disclosure provides a control device for a fixed-frequency air conditioner, as shown in fig. 4, including:
an obtaining module 40 configured to obtain a cold-out temperature of the condenser, and obtain a real-time exhaust temperature according to a preset relationship that the real-time exhaust temperature of the compressor and the cold-out temperature satisfy; and
and the control module 41 is configured to control the air conditioner to defrost if the real-time exhaust temperature change rate of the real-time exhaust temperature meets a first preset condition.
In some embodiments, the obtaining module 40 is further configured to calculate the real-time exhaust temperature change rate according to the following formula after the air conditioner heating operation is performed for the preset time:
and K is the real-time exhaust temperature change rate, delta T is the real-time exhaust temperature change value in the preset detection period, and delta T is the preset detection period.
In some embodiments, the control module 41 is further configured to control the air conditioner to defrost if the real-time exhaust temperature change rate satisfies a first preset condition and the real-time exhaust temperature satisfies a second preset condition.
The embodiment of the disclosure provides a fixed-frequency air conditioner, which comprises the control device for the fixed-frequency air conditioner.
Embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described control method for a fixed-frequency air conditioner.
The disclosed embodiments provide a computer program product comprising a computer program stored on a computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, cause the computer to perform the above-described control method for a fixed-frequency air conditioner.
The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
An embodiment of the present disclosure provides an electronic device, a structure of which is shown in fig. 5, the electronic device including:
at least one processor (processor)50, one processor 50 being exemplified in fig. 5; and a memory (memory)51, and may further include a Communication Interface (Communication Interface)52 and a bus 53. The processor 50, the communication interface 52 and the memory 51 may communicate with each other via a bus 53. The communication interface 52 may be used for information transfer. The processor 50 may call logic instructions in the memory 51 to perform the control method for the fixed-frequency air conditioner of the above-described embodiment.
In addition, the logic instructions in the memory 51 may be implemented in the form of software functional units and may be stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 51 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 50 executes functional applications and data processing by running software programs, instructions and modules stored in the memory 51, that is, implements the control method for the fixed-frequency air conditioner in the above-described method embodiment.
The memory 51 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 51 may include a high-speed random access memory, and may also include a nonvolatile memory.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the disclosed embodiments includes the full ambit of the claims, as well as all available equivalents of the claims. As used in this application, although the terms "first," "second," etc. may be used in this application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, unless the meaning of the description changes, so long as all occurrences of the "first element" are renamed consistently and all occurrences of the "second element" are renamed consistently. The first and second elements are both elements, but may not be the same element. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (13)
1. A control method for a fixed-frequency air conditioner, comprising:
obtaining the cold outlet temperature of the condenser;
obtaining real-time exhaust temperature according to a preset relation between the cold outlet temperature and the real-time exhaust temperature of the compressor;
and controlling the air conditioner to defrost under the condition that the real-time exhaust temperature change rate of the real-time exhaust temperature meets a first preset condition.
2. The method of claim 1, wherein the predetermined relationship is:
Td＝kc×Tc+ΔTc
wherein, TdFor real-time exhaust temperature, TcTo cool the temperature, kcIs the proportional coefficient of cold-leaving temperature, Δ TcIs a cold-out temperature compensation constant.
3. The method according to claim 1, wherein the first preset condition is: the real-time exhaust temperature change rate is greater than or equal to a preset exhaust temperature change rate.
4. The method of claim 1, further comprising calculating the real-time exhaust temperature change rate according to the following formula after the air conditioner heating operation is performed for a preset time:
and K is the real-time exhaust temperature change rate, delta T is the real-time exhaust temperature change value in the preset detection period, and delta T is the preset detection period.
5. The method of any of claims 1 to 4, further comprising:
and controlling the air conditioner to defrost under the condition that the real-time exhaust temperature change rate meets the first preset condition and the real-time exhaust temperature meets the second preset condition.
6. The method according to claim 5, characterized in that the second preset condition is: the real-time exhaust temperature at the current moment is less than the real-time exhaust temperature at the previous moment.
7. A control apparatus for a fixed frequency air conditioner, comprising:
the acquisition module is configured to acquire the cold outlet temperature of the condenser and acquire the real-time exhaust temperature according to the preset relation between the cold outlet temperature and the real-time exhaust temperature of the compressor; and
the control module is configured to control the air conditioner to defrost under the condition that the real-time exhaust temperature change rate of the real-time exhaust temperature meets a first preset condition.
8. The apparatus of claim 7, wherein the predetermined relationship is:
Td＝kc×Tc+ΔTc
wherein, TdFor real-time exhaust temperature, TcTo cool the temperature, kcIs the proportional coefficient of cold-leaving temperature, Δ TcIs a cold-out temperature compensation constant.
9. The apparatus according to claim 7, wherein the first preset condition is: the real-time exhaust temperature change rate is greater than or equal to a preset exhaust temperature change rate.
10. The apparatus of claim 7, wherein the obtaining module is further configured to calculate the real-time exhaust temperature change rate according to the following formula after the preset time of the air conditioner heating operation:
and K is the real-time exhaust temperature change rate, delta T is the real-time exhaust temperature change value in the preset detection period, and delta T is the preset detection period.
11. The apparatus according to any one of claims 7 to 10,
the control module is further configured to: and controlling the air conditioner to defrost under the condition that the real-time exhaust temperature change rate meets the first preset condition and the real-time exhaust temperature meets the second preset condition.
12. The apparatus according to claim 11, wherein the second preset condition is: the real-time exhaust temperature at the current moment is less than the real-time exhaust temperature at the previous moment.
13. A constant-frequency air conditioner, characterized by comprising the control device for a constant-frequency air conditioner according to any one of claims 7 to 12.
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| CN201910484870.3A CN112050431A (en) | 2019-06-05 | 2019-06-05 | Control method and device for fixed-frequency air conditioner and fixed-frequency air conditioner |
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| CN201910484870.3A CN112050431A (en) | 2019-06-05 | 2019-06-05 | Control method and device for fixed-frequency air conditioner and fixed-frequency air conditioner |
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Citations (10)
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| CN104596032A (en) * | 2014-12-31 | 2015-05-06 | 广东美的制冷设备有限公司 | Air conditioner and defrosting control method thereof |
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| CN105180537A (en) * | 2015-09-09 | 2015-12-23 | 杭州先途电子有限公司 | Defrosting control method based on opening degree of electronic expansion valve |
| CN108469098A (en) * | 2018-03-06 | 2018-08-31 | 广东美的制冷设备有限公司 | Defrosting control method, device, air conditioner and computer readable storage medium |
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| JPS5618248A (en) * | 1979-07-24 | 1981-02-20 | Mitsubishi Electric Corp | Defrosting control apparatus of air conditioner |
| US20030202557A1 (en) * | 2002-04-29 | 2003-10-30 | Thermo King Corporation | Transport temperature control unit and methods of defrosting an evaporator coil of the same |
| JP2004245479A (en) * | 2003-02-13 | 2004-09-02 | Calsonic Kansei Corp | Frost formation detecting method for refrigerating cycle using supercritical refrigerant and defrosting method using the same |
| CN102410629A (en) * | 2011-10-28 | 2012-04-11 | 陕西隆科来福节能设备有限责任公司 | Air source heat pump water heater system and operation control method thereof |
| CN102563805A (en) * | 2011-12-22 | 2012-07-11 | 广东美的制冷设备有限公司 | Control method for calculating exhaust temperature of compressor of air conditioner |
| CN104214885A (en) * | 2013-05-29 | 2014-12-17 | 珠海格力电器股份有限公司 | Air-conditioner defrosting control method and device and air-conditioner |
| CN105004017A (en) * | 2014-04-16 | 2015-10-28 | 三菱电机株式会社 | Air-conditioning apparatus |
| CN104596032A (en) * | 2014-12-31 | 2015-05-06 | 广东美的制冷设备有限公司 | Air conditioner and defrosting control method thereof |
| CN105180537A (en) * | 2015-09-09 | 2015-12-23 | 杭州先途电子有限公司 | Defrosting control method based on opening degree of electronic expansion valve |
| CN108469098A (en) * | 2018-03-06 | 2018-08-31 | 广东美的制冷设备有限公司 | Defrosting control method, device, air conditioner and computer readable storage medium |
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