CN113639395B - Control method and system of multi-split air conditioner and multi-split air conditioner - Google Patents
Control method and system of multi-split air conditioner and multi-split air conditioner Download PDFInfo
- Publication number
- CN113639395B CN113639395B CN202110898012.0A CN202110898012A CN113639395B CN 113639395 B CN113639395 B CN 113639395B CN 202110898012 A CN202110898012 A CN 202110898012A CN 113639395 B CN113639395 B CN 113639395B
- Authority
- CN
- China
- Prior art keywords
- opening degree
- air conditioner
- split air
- indoor unit
- standby state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- F24F11/62—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
-
- 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
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2130/00—Control inputs relating to environmental factors not covered by group F24F2110/00
- F24F2130/40—Noise
-
- 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
- F24F2140/20—Heat-exchange fluid temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention relates to the technical field of air conditioner control, and particularly provides a control method and a control system of a multi-split air conditioner and the multi-split air conditioner, aiming at solving the problem that the existing multi-split air conditioner cannot effectively control the flow noise of a refrigerant generated by an indoor unit in a heating mode standby state under different working conditions. The control method of the multi-split air conditioner adjusts the opening degree of the electronic expansion valve of the indoor unit in the standby state according to the temperature parameter related to the refrigerant phase state in the operation process of the multi-split air conditioner operating in the heating mode, can change the refrigerant flow of the indoor unit in the standby state under different working conditions, further changes the proportion of gaseous refrigerants and liquid refrigerants and achieves the purpose of reducing the flowing noise of the refrigerants.
Description
Technical Field
The invention relates to the technical field of air conditioner control, and particularly provides a control method and a control system of a multi-split air conditioner and the multi-split air conditioner.
Background
When the multi-split air conditioner works in a heating mode, a heat exchanger in the indoor unit works in a condensing mode, and under an ideal state, a refrigerant in the heat exchanger is in a liquid state. However, in actual operation, gaseous refrigerant is mixed into liquid refrigerant, and when the gas-liquid refrigerant passes through the electronic expansion valve, a large number of bubbles generated in the gaseous refrigerant are broken due to a large difference in pressure between the front and rear sides of the electronic expansion valve, thereby generating noise of the broken bubbles. The noise of bubble collapse is mainly related to the size of the bubbles, and the larger the ratio of gaseous refrigerant to liquid refrigerant in the refrigerant is, the larger the bubbles are generated, and the larger the noise of bubble collapse is further caused.
However, in the related art, when the multi-split air conditioner is in the heating mode, the electronic expansion valve of the indoor unit in the standby state is generally controlled to a fixed opening degree. In the operation process of the multi-split air conditioner, because a pipeline through which a refrigerant flows is shared, and the number of indoor units in a standby state in the multi-split air conditioner is not fixed randomly, the gas-liquid state proportion of the refrigerant in the pipeline is different (the refrigerant state is different), and thus noise with different sizes is generated. If the opening degree of the expansion valve of the indoor unit in the standby state is controlled to be a fixed opening degree, when refrigerants in different refrigerant states pass through the electronic expansion valve with the fixed opening degree under different working conditions, the situation that refrigerant flowing noise is large may occur, and the overall use experience of a user is influenced.
Accordingly, there is a need in the art for a new control scheme for a multi-split air conditioner to solve the above problems.
Disclosure of Invention
The invention aims to solve the technical problems, namely, the problems that the flow noise of the refrigerant generated by the indoor unit which is in the standby state in the heating mode under different refrigerant states (the proportional state of the gaseous refrigerant and the liquid refrigerant in the pipeline) cannot be effectively controlled by the existing multi-split air conditioner, and the use experience of a user is influenced are solved.
In a first aspect, the present invention provides a method for controlling a multi-split air conditioner including a plurality of indoor units, the method comprising:
when the multi-split air conditioner operates in a heating mode, determining an indoor unit in a standby state;
and adjusting the opening degree of an electronic expansion valve of the indoor unit in the standby state according to the temperature parameter related to the phase state of the refrigerant in the running process of the multi-split air conditioner, and adjusting the proportion of gaseous refrigerants and liquid refrigerants by changing the refrigerant flow of the indoor unit in the standby state to reduce the refrigerant flowing noise of the indoor unit in the standby state.
In one embodiment of the method for controlling a multi-split air conditioner, the temperature parameters include a coil temperature of the indoor unit in the standby state and an exhaust temperature of the compressor, and the step of adjusting an opening degree of an electronic expansion valve of the indoor unit in the standby state according to the temperature parameters related to a refrigerant phase state during the operation of the multi-split air conditioner includes:
acquiring the temperature of the coil pipe and the temperature of the exhaust gas at fixed time;
obtaining a difference value between the exhaust temperature and the coil temperature according to the coil temperature and the exhaust temperature;
and selectively adjusting the opening degree of the electronic expansion valve according to the comparison result of the difference value and a preset threshold value.
In one aspect of the control method of the multi-split air conditioner, the preset threshold includes a first threshold and a second threshold, and the step of selectively adjusting the opening degree of the electronic expansion valve according to a comparison result between the difference and the preset threshold includes:
when the difference value is smaller than the first threshold value, controlling the opening degree to be reduced by a first opening degree;
when the difference value is larger than the second threshold value, controlling the opening degree to increase by a second opening degree;
when the difference value is greater than or equal to the first threshold value and less than or equal to the second threshold value, controlling the opening degree to be kept unchanged;
wherein, the upper limit of the opening degree of the adjusted electronic expansion valve is a third opening degree, and the lower limit of the opening degree of the adjusted electronic expansion valve is a fourth opening degree;
the first threshold and the second threshold are respectively determined according to a minimum difference and a maximum difference of a preset difference range, and the preset difference range is a difference range between the coil temperature of the indoor unit and the exhaust temperature of the compressor, which is detected when the refrigerant flowing noise is smaller than the noise threshold.
In one embodiment of the control method of the multi-split air conditioner, the method further includes setting an initial opening degree of an electronic expansion valve of the indoor unit in the standby state by:
and when the multi-split air conditioner runs in the heating mode again, setting the initial opening as the opening recorded when the indoor unit exits the standby state last time.
In a second aspect, the present invention provides a control system of a multi-split air conditioner including a plurality of indoor units, the control system comprising:
a standby indoor unit determination module configured to determine an indoor unit in a standby state when the multi-split air conditioner operates in a heating mode;
and the noise reduction control module is configured to adjust the opening degree of an electronic expansion valve of the indoor unit in the standby state according to the temperature parameter related to the refrigerant phase state in the running process of the multi-split air conditioner, so as to adjust the proportion of gaseous refrigerant and liquid refrigerant by changing the refrigerant flow of the indoor unit in the standby state, and reduce the refrigerant flowing noise of the indoor unit in the standby state.
In an embodiment of the control system of the multi-split air conditioner, the temperature parameter includes a coil temperature of the indoor unit in the standby state and an exhaust temperature of a compressor, and the noise reduction control module includes:
a coil temperature and exhaust temperature acquisition unit configured to acquire the coil temperature and the exhaust temperature at regular time;
a temperature difference obtaining unit configured to obtain a difference between the exhaust temperature and the coil temperature according to the coil temperature and the exhaust temperature;
an opening degree adjustment unit configured to selectively adjust an opening degree of the electronic expansion valve according to a comparison result of the difference value with a preset threshold value.
In an aspect of the control system of the multi-split air conditioner, the preset threshold includes a first threshold and a second threshold, and the opening degree adjusting unit is configured to selectively adjust the opening degree of the electronic expansion valve according to the following steps:
when the difference value is smaller than the first threshold value, controlling the opening degree to be reduced by a first opening degree;
when the difference value is larger than the second threshold value, controlling the opening degree to be increased by a second opening degree;
when the difference value is greater than or equal to the first threshold value and less than or equal to the second threshold value, controlling the opening degree to be kept unchanged;
wherein, the upper limit of the opening degree of the adjusted electronic expansion valve is a third opening degree, and the lower limit of the opening degree of the adjusted electronic expansion valve is a fourth opening degree;
the first threshold and the second threshold are respectively determined according to a minimum difference and a maximum difference of a preset difference range, and the preset difference range is a difference range between the coil temperature of the indoor unit and the exhaust temperature of the compressor, which is detected when the refrigerant flowing noise is smaller than the noise threshold.
In an aspect of the control system of the multi-split air conditioner, the system further includes an initial opening setting module configured to set an initial opening of an electronic expansion valve of the indoor unit in the standby state by:
and when the multi-split air conditioner runs in the heating mode again, setting the initial opening as the opening recorded when the indoor unit exits the standby state last time.
In a third aspect, there is provided a control system of a multi-split air conditioner, comprising a processor and a storage device adapted to store a plurality of program codes adapted to be loaded and run by the processor to perform the control method of the multi-split air conditioner according to any one of the above-described aspects of the control method of the multi-split air conditioner.
In a fourth aspect, a multi-split air conditioner is provided, and the multi-split air conditioner comprises a multi-split air conditioner body and the control system of the multi-split air conditioner in any one of the technical solutions of the control system of the multi-split air conditioner.
Repeated tests determine that the temperature parameter related to the refrigerant phase can reflect the phase change condition (the ratio change of the refrigerant in the gas state and the refrigerant in the liquid state, namely the ratio change of the refrigerant in the gas state and the refrigerant in the liquid state) of the refrigerant of the multi-split air conditioner under different working conditions (the number of the indoor units in the standby state in the heating mode is different) to a certain extent. Because the phase change conditions of different refrigerants cause different proportions of gaseous refrigerants and liquid refrigerants in the coil pipe of the indoor unit, and noise with different sizes can be generated. Therefore, under the condition of adopting the technical scheme, the opening degree of the electronic expansion valve of the indoor unit in the standby state can be adjusted according to the temperature parameter related to the phase state of the refrigerant, the refrigerant flow of the indoor unit in the standby state under different working conditions is changed, and then the proportion of the gaseous refrigerant and the liquid refrigerant is changed, so that the refrigerant flowing noise of the indoor unit in the standby state is reduced, and the user experience is improved.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present invention. Wherein:
fig. 1 is a flowchart illustrating main steps of a control method of a multi-split air conditioner according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating main steps of a control method of a multi-split air conditioner according to an embodiment of the present invention;
fig. 3 is a schematic view illustrating the adjustment of the opening degree of the electronic expansion valve of the indoor unit in a standby state in a range of different temperature differences a according to an embodiment of the present invention;
fig. 4 is a main configuration block diagram of a control system of a multi-split air conditioner according to an embodiment of the present invention.
Detailed Description
Some embodiments of the invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, a "module" or "processor" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, may comprise software components such as program code, or may be a combination of software and hardware. The processor may be a central processing unit, a microprocessor, a digital signal processor, or any other suitable processor. The processor has data and/or signal processing functionality. The processor may be implemented in software, hardware, or a combination thereof. Non-transitory computer readable storage media include any suitable medium that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random-access memory, and the like. The term "a and/or B" denotes all possible combinations of a and B, such as a alone, B alone or a and B. The term "at least one of A or B" or "at least one of A and B" means similar to "A and/or B" and may include only A, only B, or both A and B. The singular forms "a", "an" and "the" may include the plural forms as well.
At present, when a traditional multi-split air conditioner is in a heating mode, an expansion valve of an indoor unit is generally controlled to be at a fixed opening degree. The control mode is relatively single, and the problem that different indoor units generate refrigerant flowing noise under different working conditions (different refrigerant phases) cannot be effectively controlled, so that the overall use experience of a user is influenced. Accordingly, the invention provides a control method and a control system of a multi-split air conditioner and the multi-split air conditioner, which are used for solving the problems.
Referring to fig. 1, fig. 1 is a flowchart illustrating main steps of a control method of a multi-split air conditioner according to an embodiment of the present invention. As shown in fig. 1, in the control method of the multi-split air conditioner in the embodiment of the present invention, the multi-split air conditioner includes a plurality of indoor units, and the control method mainly includes the following steps S101 to S102.
Step S101: and when the multi-split air conditioner operates in the heating mode, determining the indoor unit in a standby state.
In the present embodiment, when the multi-split air conditioner is operated in the heating mode, the indoor unit in the standby state may be determined.
Specifically, when the multi-split air conditioner operates in the heating mode, the flow direction of the refrigerant is in a counter flow mode, the counter flow of the refrigerant generates oscillation, and meanwhile, under the action of evaporation pressure and condensation pressure, the refrigerant can generate different phase changes of gas-liquid mixture (the proportion change of the refrigerant in a gas state and the refrigerant in a liquid state, namely the proportion change of the refrigerant in a gas state and the refrigerant in a liquid state), and further airflow impact noise is generated. When the indoor unit is in the standby state, the fan of the indoor unit is not operated, and thus the flow noise of the refrigerant is further amplified, so that it is necessary to determine the indoor unit in the standby state.
Step S102: the opening degree of an electronic expansion valve of the indoor unit in the standby state is adjusted according to the temperature parameter related to the phase state of the refrigerant in the running process of the multi-split air conditioner, so that the proportion of the gaseous refrigerant and the liquid refrigerant is adjusted by changing the refrigerant flow of the indoor unit in the standby state, and the refrigerant flowing noise of the indoor unit in the standby state is reduced.
In this embodiment, the opening degree of the electronic expansion valve of the indoor unit in the standby state determined in step S101 may be adjusted according to the temperature parameter related to the phase state of the refrigerant during the operation of the multi-split air conditioner, so as to change the refrigerant flow rate of the indoor unit, and further change the ratio of the gaseous refrigerant to the liquid refrigerant, so as to reduce the refrigerant flow noise of the indoor unit in the standby state.
Specifically, the temperature parameter related to the refrigerant phase can reflect the phase change condition (the ratio change condition of the gaseous refrigerant and the liquid refrigerant) of the refrigerant of the multi-split air conditioner under different working conditions (different numbers of indoor units in the standby state of the heating mode) to a certain extent. Therefore, after the opening degree of the electronic expansion valve of the indoor unit in the standby state is adjusted according to the temperature parameter related to the phase state of the refrigerant, the refrigerant flow of the indoor unit in the standby state under different working conditions can be changed, and further the ratio of the gaseous refrigerant to the liquid refrigerant in the refrigerant flow is changed, so that the refrigerant flowing noise of the indoor unit in the standby state is reduced.
Through the steps S101 to S102, in the embodiment of the present invention, the opening degree of the electronic expansion valve of the indoor unit in the standby state can be adjusted according to the temperature parameter related to the phase state of the refrigerant during the operation of the multi-split air conditioner in the heating mode. The temperature parameters related to the phase state of the refrigerant can reflect the phase state change condition of the refrigerant of the multi-split air conditioner under different working conditions (different numbers of indoor units in the standby state of the heating mode) to a certain extent. The phase change condition of different refrigerants can cause the flow of refrigerant different, and then lead to gaseous state refrigerant different with the proportion of liquid refrigerant in the refrigerant, adjust the aperture of the electronic expansion valve of the indoor set that is in standby state according to the temperature parameter relevant with refrigerant phase, can change the refrigerant flow of the indoor set that is in standby state under the different operating modes, and then change the proportion of gaseous state refrigerant and liquid refrigerant in the refrigerant flow, reduce the refrigerant flow noise of the indoor set of standby state, promote user experience.
Step S102 will be further described below.
In an optional implementation manner of the embodiment of the present invention, the temperature parameters related to the refrigerant phase may be a coil temperature of the indoor unit in the standby state and an exhaust temperature of the compressor, and step S102 may further include:
step S1021: acquiring the temperature of a coil pipe and the exhaust temperature at regular time;
step S1022: obtaining the difference between the exhaust temperature and the coil temperature according to the coil temperature and the exhaust temperature
Step S1023: and selectively adjusting the opening degree of the electronic expansion valve according to the comparison result of the difference value and the preset threshold value.
In this embodiment, the temperature parameter related to the refrigerant phase may be a coil temperature of the indoor unit in the standby state and an exhaust temperature of the compressor. The coil temperature of the indoor unit in the standby state and the exhaust temperature of the compressor can be acquired every interval time T, the difference value between the exhaust temperature and the coil temperature is further acquired, and the opening degree of the electronic expansion valve of the indoor unit in the standby state can be selectively adjusted according to the comparison result between the difference value between the exhaust temperature and the coil temperature and the preset threshold value. The value of the time T can be adjusted by those skilled in the art according to the needs of the actual application process.
Specifically, in general, in an ideal state, a liquid refrigerant should flow in the coil pipe of the indoor unit in the heating mode, and a gaseous refrigerant should flow in the discharge pipe of the compressor. However, in the actual operation process of the multi-split air conditioner, the liquid refrigerant flowing in the coil pipe of the indoor unit in the standby state may be mixed with the gaseous refrigerant to form a gas-liquid mixed refrigerant, and the gaseous refrigerant in the exhaust pipe of the compressor may also be mixed with the liquid refrigerant to form the gas-liquid mixed refrigerant, which may affect the coil pipe temperature of the indoor unit in the standby state and the exhaust temperature of the compressor. Correspondingly, the opening degree of the electronic expansion valve can be selectively adjusted according to the comparison result of the difference value between the detected coil temperature of the indoor unit in the standby state and the exhaust temperature of the compressor and the preset threshold value, so that the proportion of a gas-liquid refrigerant and a liquid refrigerant in the refrigerant is changed by changing the refrigerant flow of the gas-liquid mixed refrigerant, and the airflow impact noise generated by the gas refrigerant in the gas-liquid mixed refrigerant, such as the noise generated by bubble breakage in the gas refrigerant, namely the refrigerant flowing noise, is reduced.
In an embodiment of the present invention, the preset threshold may include a first threshold and a second threshold, and the step S1023 may further include:
step S10231: when the difference is smaller than a first threshold value, controlling the opening degree to be reduced by a first opening degree;
step S10232: when the difference is larger than a second threshold value, controlling the opening degree to increase by a second opening degree;
step S10233: when the difference value is greater than or equal to the first threshold value and less than or equal to the second threshold value, controlling the opening degree to be kept unchanged;
wherein, the upper limit of the opening degree of the adjusted electronic expansion valve is a third opening degree, and the lower limit of the opening degree of the adjusted electronic expansion valve is a fourth opening degree; the first threshold and the second threshold are respectively determined according to the minimum difference and the maximum difference of a preset difference range, and the preset difference range is the difference range between the coil temperature of the indoor unit and the exhaust temperature of the compressor detected when the refrigerant flowing noise is smaller than the noise threshold.
In this embodiment, when the difference between the discharge temperature of the compressor and the coil temperature of the indoor unit obtained in step S1022 is smaller than the first threshold, the opening degree of the electronic expansion valve of the indoor unit in the standby state may be controlled to decrease by the first opening degree; when the difference is greater than the second threshold, the opening degree of the electronic expansion valve of the indoor unit in the standby state can be controlled to be increased by the second opening degree; and when the difference value is greater than or equal to the first threshold value and less than or equal to the second threshold value, controlling the opening degree of the electronic expansion valve of the indoor unit in the standby state to be kept unchanged. The upper limit of the opening degree of the adjusted electronic expansion valve is a third opening degree, the lower limit of the opening degree of the adjusted electronic expansion valve is a fourth opening degree, and the third opening degree and the fourth opening degree can be determined according to the actual model of the indoor unit and the type of the electronic expansion valve; the first threshold value, the second threshold value, the first opening degree and the second opening degree are measured values obtained by a test process.
Specifically, the coil temperature of the indoor unit in the standby state is set to TC, the discharge temperature of the compressor is set to CT, the temperature difference between the two is a = CT-TC, the opening degree of the electronic expansion valve is set to L, the upper limit of the adjusted opening degree of the electronic expansion valve is MAX, the lower limit of the opening degree is MIN, the first threshold value is N1, the second threshold value is N2, the first opening degree is L1, and the second opening degree is L2. In the test process of reducing the flowing noise of the refrigerant by adjusting the opening degree of the electronic expansion valve of the indoor unit in the standby state, the noise value corresponding to the flowing noise of the refrigerant and the corresponding temperature difference A under different opening degrees of the electronic expansion valve can be obtained. Determining an interval of which the refrigerant flow noise is smaller than a noise threshold value according to a noise value corresponding to the refrigerant flow noise, determining an interval of a corresponding temperature difference A according to the interval of which the refrigerant flow noise is smaller than the noise threshold value, and further finding out that the refrigerant flow noise can be reduced by reducing the opening degree of the electronic expansion valve when the value of the temperature difference A is smaller than the minimum value of the interval according to experiments; when the value of A is larger than the maximum value of the interval, the flow noise of the refrigerant can be reduced by increasing the opening of the electronic expansion valve. Reference may be made to fig. 3, wherein fig. 3 is a schematic diagram illustrating an adjustment of an opening degree of an electronic expansion valve of an indoor unit in a standby state in a range of different temperature differences a according to an embodiment of the present invention. As shown in fig. 3, when a < N1, the opening degree of the electronic expansion valve is controlled to decrease L1, that is, the opening degree of the electronic expansion valve is decreased to reduce the refrigerant flow noise; when A is larger than N2, the opening degree of the electronic expansion valve is controlled to be increased by L2, namely, the flow noise of the refrigerant can be reduced by increasing the opening degree of the electronic expansion valve; and when N1 is more than or equal to A and less than or equal to N2, controlling the opening of the electronic expansion valve to be kept unchanged, namely, the flowing noise of the refrigerant in the interval is less than a noise threshold value, and avoiding noise reduction.
In an embodiment of the present invention, the method for controlling a multi-split air conditioner may further include step S103 in addition to the above steps S101 to S102, and the initial opening degree of the electronic expansion valve of the indoor unit in the standby state is set through step S103.
Step S103: and when the multi-split air conditioner operates in the heating mode again, setting the initial opening of the indoor unit in the standby state as the opening recorded when the indoor unit exits the standby state last time.
In this embodiment, when the multi-split air conditioner is not in the first-operation heating mode, the initial opening degree of the indoor unit in the standby state may be set to the opening degree recorded when the indoor unit last exited the standby state.
Specifically, the flow rate of the refrigerant is adjusted by the opening degree of the electronic expansion valve in the indoor unit, and when the indoor unit is in the standby state, in order to avoid the refrigerant accumulating inside the indoor unit, causing the refrigerant flow rate insufficiency and other faults, when the multi-split air conditioner operates in the heating mode, the electronic expansion valve of the indoor unit, which is usually in the standby state, maintains a certain opening degree so that the refrigerant in the indoor unit participates in the refrigerant circulation of the multi-split air conditioner, and the maintained opening degree is generally called a reference reserved opening degree, and the reference reserved opening degree is generally set when the multi-split air conditioner leaves a factory. When the multi-split air conditioner is operated in the heating mode for the first time, the initial opening degree of the indoor unit in the standby state may be set as the reference reserved opening degree. When the multi-split air conditioner is operated again in the heating mode, according to the adjustment process in step S1023, the opening degree of the electronic expansion valve when the indoor unit in the standby state exits from the standby state is recorded as the initial opening degree when the indoor unit enters into the standby state in the next multi-split air conditioner operation heating mode, so that the indoor unit entering into the standby state keeps a certain opening degree, the refrigerant in the indoor unit can participate in the refrigerant circulation of the multi-split air conditioner, and the refrigerant flow noise when the indoor unit enters into the standby state is lower because the initial opening degree is the opening degree recorded when the indoor unit last exits from the standby state.
Referring to fig. 2, in which fig. 2 is a flowchart illustrating main steps of a control method of a multi-split air conditioner according to an embodiment of the present invention. As shown in fig. 2, in an implementation manner of an embodiment of the present invention, the method for controlling a multi-split air conditioner may further include:
step S201: the multi-split air conditioner is started for the first time;
step S202: an indoor unit operating in a heating mode in a standby state is determined.
In this embodiment, the method of step S202 is similar to the method of step S101 in the foregoing embodiment, and for simplicity of description, the description is omitted here.
Step S203: the opening degree of an electronic expansion valve of an indoor unit in a standby state is set to be an initial opening degree.
In this embodiment, the opening degree of the indoor unit in the standby state in the multi-split air conditioner that is turned on for the first time may be set to the initial opening degree.
Step S204: and controlling the opening degree of an electronic expansion valve of the indoor unit according to the difference value between the temperature of the coil of the indoor unit in the standby state and the exhaust temperature of the compressor.
In this embodiment, the method of step S204 is similar to the methods of step S1022 and step S1023 in the foregoing embodiment, and is not repeated herein for simplicity.
Step S205: and recording the opening degree of the electronic expansion valve of the indoor unit when the indoor unit exits the standby state.
Step S206: the initial opening degree of the electronic expansion valve in the standby state is set to the opening degree recorded when the electronic expansion valve exits the standby state last time, and the process goes to step S204.
In this embodiment, the method of step S205 and step S206 is similar to the method of step S103 in the foregoing embodiment, and is not repeated herein for simplicity of description.
It should be noted that, although the foregoing embodiments describe each step in a specific sequence, those skilled in the art will understand that, in order to achieve the effect of the present invention, different steps do not necessarily need to be executed in such a sequence, and they may be executed simultaneously (in parallel) or in other sequences, and these changes are all within the protection scope of the present invention.
Further, the invention also provides a control system of the multi-split air conditioner.
Referring to fig. 4, fig. 4 is a main block diagram of a control system of a multi-split air conditioner according to an embodiment of the present invention. As shown in fig. 4, the multi-split air conditioner in the embodiment of the present invention may include a plurality of indoor units, and the control system of the multi-split air conditioner may include a standby indoor unit determination module and a noise reduction control module. In this embodiment, the standby indoor unit determining module may be configured to determine an indoor unit in a standby state when the multi-split air conditioner is operated in the heating mode. The noise reduction control module can be configured to adjust the opening degree of an electronic expansion valve of the indoor unit in the standby state according to the temperature parameter related to the refrigerant phase state in the running process of the multi-split air conditioner, so as to adjust the proportion of the gaseous refrigerant and the liquid refrigerant by changing the refrigerant flow of the indoor unit in the standby state, and reduce the refrigerant flowing noise of the indoor unit in the standby state.
In one embodiment, the temperature parameter related to the phase state of the refrigerant may include a coil temperature of an indoor unit in a standby state and an exhaust temperature of a compressor, and the noise reduction control module may include a coil temperature and exhaust temperature obtaining unit, a temperature difference obtaining unit, and an opening degree adjusting unit. In this embodiment, the coil temperature and exhaust temperature acquisition unit may be configured to acquire the coil temperature and the exhaust temperature at regular times. The temperature difference acquisition unit may be configured to obtain a difference between the exhaust temperature and the coil temperature from the coil temperature and the exhaust temperature. The opening degree adjustment unit may be configured to selectively adjust the opening degree of the electronic expansion valve according to a comparison result of the difference value with a preset threshold value.
In one embodiment, the preset threshold may include a first threshold and a second threshold, and the opening degree adjustment unit may be configured to selectively adjust the opening degree of the electronic expansion valve according to the following steps: when the difference is smaller than a first threshold value, controlling the opening degree to be reduced by a first opening degree; when the difference is larger than a second threshold value, controlling the opening degree to increase by a second opening degree; when the difference value is greater than or equal to a first threshold value and less than or equal to a second threshold value, controlling the opening degree to be unchanged; wherein, the upper limit of the opening degree of the adjusted electronic expansion valve is a third opening degree, and the lower limit of the opening degree of the adjusted electronic expansion valve is a fourth opening degree; the first threshold and the second threshold are respectively determined according to the minimum difference and the maximum difference of a preset difference range, and the preset difference range is the difference range between the coil temperature of the indoor unit and the exhaust temperature of the compressor detected when the refrigerant flowing noise is smaller than the noise threshold.
In one embodiment, the control system of the multi-split air conditioner may further include an initial opening degree setting module, and the initial opening degree setting module may be configured to set an initial opening degree of an electronic expansion valve of the indoor unit in a standby state by: and when the multi-split air conditioner operates in the heating mode again, setting the initial opening as the opening recorded when the indoor unit exits the standby state last time.
The technical principles, the solved technical problems, and the generated technical effects of the control system of the multi-split air conditioner described above are similar for implementing the embodiments of the control method of the multi-split air conditioner shown in fig. 1 and fig. 2, and it can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the contents described in the embodiments of the control method of the multi-split air conditioner may be referred to and are not repeated herein.
Further, the invention also provides a control system of the multi-split air conditioner. In an embodiment of the multi-split air conditioner control system according to the present invention, the multi-split air conditioner control system includes a processor and a storage device, the storage device is adapted to store a plurality of program codes, the program codes are adapted to be loaded and executed by the processor to perform the control method of the multi-split air conditioner of the above method embodiment, and the processor may be configured to execute a program in the storage device, the program including, but not limited to, a program for performing the control method of the multi-split air conditioner of the above method embodiment. For convenience of explanation, only the parts related to the embodiments of the present invention are shown, and details of the specific techniques are not disclosed. The computer device may be a control apparatus device formed including various electronic devices.
Further, the invention also provides a multi-split air conditioner. In an embodiment of a multi-split air conditioner according to the present invention, the multi-split air conditioner includes a multi-split air conditioner body and a control system of the multi-split air conditioner according to any one of the above-described control systems of the multi-split air conditioner.
It will be understood by those skilled in the art that all or part of the flow of the method of the above-described embodiment may be implemented by a computer program, which may be stored in a computer-readable storage medium, and the steps of the method embodiments may be implemented when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying said computer program code, medium, U.S. disk, removable hard disk, magnetic diskette, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunications signal, software distribution medium, or the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
Further, it should be understood that, since the configuration of each module is only for explaining the functional units of the apparatus of the present invention, the corresponding physical devices of the modules may be the processor itself, or a part of software, a part of hardware, or a part of a combination of software and hardware in the processor. Thus, the number of individual modules in the figures is merely illustrative.
Those skilled in the art will appreciate that the various modules in the apparatus may be adaptively split or combined. Such splitting or combining of specific modules does not cause the technical solutions to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or combining will fall within the protection scope of the present invention.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (6)
1. A control method of a multi-split air conditioner is characterized in that the multi-split air conditioner comprises a plurality of indoor units, and the control method comprises the following steps:
when the multi-split air conditioner operates in a heating mode, determining an indoor unit in a standby state;
adjusting the opening degree of an electronic expansion valve of the indoor unit in the standby state according to the temperature parameter related to the phase state of the refrigerant in the running process of the multi-split air conditioner, and reducing the refrigerant flowing noise of the indoor unit in the standby state by adjusting the proportion of gaseous refrigerant and liquid refrigerant in a manner of changing the refrigerant flow of the indoor unit in the standby state;
the temperature parameters comprise the coil temperature of the indoor unit in the standby state and the exhaust temperature of the compressor, and the step of adjusting the opening degree of an electronic expansion valve of the indoor unit in the standby state according to the temperature parameters related to the phase state of the refrigerant in the running process of the multi-split air conditioner comprises the following steps:
acquiring the temperature of the coil pipe and the temperature of the exhaust gas at fixed time;
obtaining a difference value between the exhaust temperature and the coil temperature according to the coil temperature and the exhaust temperature;
selectively adjusting the opening degree of the electronic expansion valve according to the comparison result of the difference value and a preset threshold value;
the preset threshold includes a first threshold and a second threshold, and the step of selectively adjusting the opening degree of the electronic expansion valve according to the comparison result of the difference and the preset threshold includes:
when the difference value is smaller than the first threshold value, controlling the opening degree to be reduced by a first opening degree;
when the difference value is larger than the second threshold value, controlling the opening degree to increase by a second opening degree;
when the difference value is greater than or equal to the first threshold value and less than or equal to the second threshold value, controlling the opening degree to be kept unchanged;
wherein, the upper limit of the opening degree of the adjusted electronic expansion valve is a third opening degree, and the lower limit of the opening degree of the adjusted electronic expansion valve is a fourth opening degree;
the first threshold and the second threshold are respectively determined according to a minimum difference and a maximum difference of a preset difference range, and the preset difference range is a difference range between the detected coil temperature of the indoor unit and the detected exhaust temperature of the compressor when the flowing noise of the refrigerant is smaller than the noise threshold.
2. The control method of a multi-split air conditioner as claimed in claim 1, further comprising setting an initial opening degree of an electronic expansion valve of the indoor unit in a standby state by:
and when the multi-split air conditioner operates in the heating mode again, setting the initial opening as the opening recorded when the indoor unit exits the standby state last time.
3. The utility model provides a control system of multi-split air conditioner, its characterized in that, multi-split air conditioner includes a plurality of indoor units, control system includes:
a standby indoor unit determination module configured to determine an indoor unit in a standby state when the multi-split air conditioner operates in a heating mode;
the noise reduction control module is configured to adjust the opening degree of an electronic expansion valve of the indoor unit in the standby state according to temperature parameters related to the phase state of refrigerant in the running process of the multi-split air conditioner, so as to adjust the proportion of gaseous refrigerant and liquid refrigerant by changing the refrigerant flow of the indoor unit in the standby state and reduce the refrigerant flowing noise of the indoor unit in the standby state;
the temperature parameters comprise the coil temperature of the indoor unit in the standby state and the exhaust temperature of the compressor, and the noise reduction control module comprises:
a temperature acquisition unit configured to acquire the coil temperature and the exhaust temperature at regular time;
a temperature difference obtaining unit configured to obtain a difference between the exhaust temperature and the coil temperature according to the coil temperature and the exhaust temperature;
an opening degree adjusting unit configured to selectively adjust an opening degree of the electronic expansion valve according to a comparison result of the difference value with a preset threshold value;
the preset threshold value comprises a first threshold value and a second threshold value, and the opening degree adjusting unit is configured to selectively adjust the opening degree of the electronic expansion valve according to the following steps:
when the difference value is smaller than the first threshold value, controlling the opening degree to be reduced by a first opening degree;
when the difference value is larger than the second threshold value, controlling the opening degree to be increased by a second opening degree;
when the difference value is greater than or equal to the first threshold value and less than or equal to the second threshold value, controlling the opening degree to be kept unchanged;
wherein, the upper limit of the opening degree of the adjusted electronic expansion valve is a third opening degree, and the lower limit of the opening degree of the adjusted electronic expansion valve is a fourth opening degree;
the first threshold and the second threshold are respectively determined according to a minimum difference and a maximum difference of a preset difference range, and the preset difference range is a difference range between the coil temperature of the indoor unit and the exhaust temperature of the compressor, which is detected when the refrigerant flowing noise is smaller than the noise threshold.
4. The control system of a multi-split air conditioner as claimed in claim 3, further comprising an initial opening degree setting module configured to set an initial opening degree of an electronic expansion valve of the indoor unit in a standby state by:
and when the multi-split air conditioner runs in the heating mode again, setting the initial opening as the opening recorded when the indoor unit exits the standby state last time.
5. A control system of a multi-split air conditioner comprising a processor and a storage device adapted to store a plurality of program codes, wherein the program codes are adapted to be loaded and executed by the processor to perform the control method of the multi-split air conditioner according to any one of claims 1 to 2.
6. A multi-split air conditioner characterized by comprising a multi-split air conditioner body and the control system of the multi-split air conditioner as set forth in any one of claims 3 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110898012.0A CN113639395B (en) | 2021-08-05 | 2021-08-05 | Control method and system of multi-split air conditioner and multi-split air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110898012.0A CN113639395B (en) | 2021-08-05 | 2021-08-05 | Control method and system of multi-split air conditioner and multi-split air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113639395A CN113639395A (en) | 2021-11-12 |
| CN113639395B true CN113639395B (en) | 2023-02-28 |
Family
ID=78419764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110898012.0A Active CN113639395B (en) | 2021-08-05 | 2021-08-05 | Control method and system of multi-split air conditioner and multi-split air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113639395B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322203A (en) * | 2021-12-20 | 2022-04-12 | 广东芬尼克兹节能设备有限公司 | Multi-split air conditioner accumulated liquid discharge control method and device, storage medium and multi-split air conditioner |
| CN114353281B (en) * | 2021-12-28 | 2023-08-15 | 青岛海尔空调电子有限公司 | Electronic expansion valve control method, electronic expansion valve control device, computer equipment and storage medium |
| CN114992816B (en) * | 2022-06-20 | 2023-09-08 | 宁波奥克斯电气股份有限公司 | Control method and device of multi-split air conditioner, air conditioner and readable storage medium |
| CN115654711A (en) * | 2022-09-30 | 2023-01-31 | 宁波奥克斯电气股份有限公司 | Control method and control device for optimizing thermal comfort in refrigeration mode and multi-split air conditioner |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003294269A (en) * | 2002-04-01 | 2003-10-15 | Takasago Thermal Eng Co Ltd | Arrangement system of outdoor machine |
| JP2004226006A (en) * | 2003-01-23 | 2004-08-12 | Fujitsu General Ltd | Controller for multiple indoor unit type air conditioner |
| KR20050076080A (en) * | 2004-01-19 | 2005-07-26 | 엘지전자 주식회사 | Controling method in the multi airconditioner |
| JP2008145044A (en) * | 2006-12-08 | 2008-06-26 | Daikin Ind Ltd | Air conditioner |
| CN102032648A (en) * | 2010-12-07 | 2011-04-27 | 海信（山东）空调有限公司 | Refrigerant flow control method for multi-connected air-conditioning system during heating |
| CN107655164A (en) * | 2017-09-07 | 2018-02-02 | 三菱重工海尔(青岛)空调机有限公司 | A kind of water system air-conditioner electronic expansion valve of indoor unit aperture control method |
| CN110500702A (en) * | 2019-08-26 | 2019-11-26 | 海信（山东）空调有限公司 | Air conditioner, indoor unit electric expansion valve control method and device |
| CN110567128A (en) * | 2019-09-23 | 2019-12-13 | 宁波奥克斯电气股份有限公司 | multi-split air conditioner and control method thereof |
| CN110822615A (en) * | 2018-08-10 | 2020-02-21 | 青岛海尔空调电子有限公司 | Method and device for controlling expansion valve in multi-connected air conditioning system and storage medium |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910357B (en) * | 2016-04-25 | 2018-11-20 | 广东美的暖通设备有限公司 | Air-conditioning system and its valve body control method |
| CN110410967B (en) * | 2019-07-03 | 2021-08-24 | 宁波奥克斯电气股份有限公司 | Control method for pipeline noise of multi-split air conditioning system and multi-split air conditioning system |
-
2021
- 2021-08-05 CN CN202110898012.0A patent/CN113639395B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003294269A (en) * | 2002-04-01 | 2003-10-15 | Takasago Thermal Eng Co Ltd | Arrangement system of outdoor machine |
| JP2004226006A (en) * | 2003-01-23 | 2004-08-12 | Fujitsu General Ltd | Controller for multiple indoor unit type air conditioner |
| KR20050076080A (en) * | 2004-01-19 | 2005-07-26 | 엘지전자 주식회사 | Controling method in the multi airconditioner |
| JP2008145044A (en) * | 2006-12-08 | 2008-06-26 | Daikin Ind Ltd | Air conditioner |
| CN102032648A (en) * | 2010-12-07 | 2011-04-27 | 海信（山东）空调有限公司 | Refrigerant flow control method for multi-connected air-conditioning system during heating |
| CN107655164A (en) * | 2017-09-07 | 2018-02-02 | 三菱重工海尔(青岛)空调机有限公司 | A kind of water system air-conditioner electronic expansion valve of indoor unit aperture control method |
| CN110822615A (en) * | 2018-08-10 | 2020-02-21 | 青岛海尔空调电子有限公司 | Method and device for controlling expansion valve in multi-connected air conditioning system and storage medium |
| CN110500702A (en) * | 2019-08-26 | 2019-11-26 | 海信（山东）空调有限公司 | Air conditioner, indoor unit electric expansion valve control method and device |
| CN110567128A (en) * | 2019-09-23 | 2019-12-13 | 宁波奥克斯电气股份有限公司 | multi-split air conditioner and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113639395A (en) | 2021-11-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113639395B (en) | Control method and system of multi-split air conditioner and multi-split air conditioner | |
| CN107036256B (en) | The control method of delivery temperature, the control device of delivery temperature and air conditioner | |
| US10098264B2 (en) | Air-conditioning apparatus | |
| CN113432254B (en) | Air conditioner blockage identification method and device, air conditioner and readable storage medium | |
| JP2013178058A (en) | Air conditioner | |
| CN107477798B (en) | method and device for controlling refrigerant of air conditioner and air conditioner | |
| CN110186150B (en) | Operation control method, control device, air conditioner, and computer-readable storage medium | |
| CN113357746A (en) | Electronic expansion valve abnormality detection control method and device, air conditioner and storage medium | |
| CN111023429B (en) | Control method and system and air conditioner | |
| JP2011158219A (en) | Air conditioning control method and device | |
| WO2022198978A1 (en) | Method and device for anti-condensation control of air conditioner, and air conditioner | |
| CN109489199B (en) | Control method, device and system of air conditioning system and storage medium | |
| CN111023424A (en) | Control method and system and air conditioner | |
| US11466881B2 (en) | Controller and method for reducing standby time when controlling the number of chillers to be operated | |
| JP5013974B2 (en) | Method and apparatus for estimating cooling water temperature | |
| CN113639485A (en) | Method and device for adjusting exhaust superheat degree of heat pump equipment and heat pump equipment | |
| CN114992776A (en) | Refrigerant leakage detection method and device for air conditioning system, air conditioner and storage medium | |
| WO2022068737A1 (en) | Air conditioner and control method therefor, and computer-readable storage medium and control apparatus | |
| JP2020012564A (en) | Quantity control device and program | |
| CN111397116B (en) | Air conditioner air suction dryness control method and device, storage medium and air conditioner | |
| CN111457550B (en) | Air conditioner refrigerant shortage detection method and device and air conditioner | |
| CN114061024A (en) | Control method and control device for defrosting of air conditioning system, controller and air conditioning system | |
| CN112665153A (en) | Control method and device for cooling capacity of refrigerating system, controller and refrigerating system | |
| WO2023071198A1 (en) | Dehumidification method and device of air conditioner, storage medium, and air conditioner | |
| CN111503924B (en) | Four-way valve fault detection method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Fu Songhui Inventor after: Gao Yuhui Inventor after: Shi Bin Inventor after: Zhuo Baitian Inventor after: Cheng Shaojiang Inventor after: Li Xiuge Inventor after: Wang Guang Inventor before: Gao Yuhui Inventor before: Shi Bin Inventor before: Zhuo Baitian Inventor before: Cheng Shaojiang Inventor before: Li Xiuge Inventor before: Wang Guang |
|
| CB03 | Change of inventor or designer information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |