CN116928734A - Multi-split air conditioner control method, multi-split air conditioner and readable storage medium - Google Patents

Multi-split air conditioner control method, multi-split air conditioner and readable storage medium Download PDF

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Publication number
CN116928734A
CN116928734A CN202210329808.9A CN202210329808A CN116928734A CN 116928734 A CN116928734 A CN 116928734A CN 202210329808 A CN202210329808 A CN 202210329808A CN 116928734 A CN116928734 A CN 116928734A
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China
Prior art keywords
evaporation temperature
air conditioner
split air
low
load
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CN202210329808.9A
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Inventor
朱声浩
朱天贵
王军强
李健锋
黎顺全
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GD Midea Air Conditioning Equipment Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
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Priority to CN202210329808.9A priority Critical patent/CN116928734A/en
Publication of CN116928734A publication Critical patent/CN116928734A/en
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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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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

Abstract

The invention discloses a multi-split air conditioner control method, a multi-split air conditioner and a readable storage medium. The method comprises the following steps: acquiring operation load information and low-pressure evaporation temperature of a multi-split air conditioner; determining a target evaporation temperature of the multi-split air conditioner according to the operation load information; and adjusting the operation frequency of the compressors of the multi-split air conditioner according to the target evaporation temperature and the low-pressure evaporation temperature. According to the invention, the corresponding target evaporation temperature is selected according to the operation load information of the indoor unit, and the operation frequency of the compressor of the multi-split air conditioner is controlled based on the target evaporation, so that the problem that the low-pressure evaporation temperature of the outdoor unit cannot be accurately fed back to the evaporation temperature of the indoor unit to cause deviation of refrigeration output is solved, and the accuracy of refrigeration output is improved.

Description

Multi-split air conditioner control method, multi-split air conditioner and readable storage medium
Technical Field
The present invention relates to the field of air conditioning technologies, and in particular, to a multi-split air conditioner control method, a multi-split air conditioner, and a readable storage medium.
Background
With the development of economic technology, the air conditioner is widely applied, and the functions of the air conditioner are diversified. At present, a multi-split air conditioner system is generally formed by combining one outdoor unit and a plurality of indoor units. However, in the refrigerating operation process, due to pressure drop of the system pipeline and components, the low-pressure evaporating temperature acquired by the low-pressure sensor of the outdoor unit cannot accurately feed back the actual evaporating temperature of the indoor unit, so that the situation that the refrigerating output such as insufficient refrigerating or excessive refrigerating is deviated can occur.
Disclosure of Invention
The invention mainly aims to provide a multi-split air conditioner control method, a multi-split air conditioner and a computer readable storage medium, and aims to solve the problem that the low-pressure evaporation temperature of an outdoor unit cannot be accurately fed back to the evaporation temperature of an indoor unit to cause deviation of refrigeration output, and improve the accuracy of the refrigeration output.
In order to achieve the above object, the present invention provides a control method of a multi-split air conditioner, the method comprising the following steps:
acquiring operation load information and low-pressure evaporation temperature of a multi-split air conditioner;
determining a target evaporation temperature of the multi-split air conditioner according to the operation load information;
and adjusting the operation frequency of the compressors of the multi-split air conditioner according to the target evaporation temperature and the low-pressure evaporation temperature.
Optionally, the operation load information includes an operation load value and a load change trend, and the step of determining the target evaporation temperature of the multi-split air conditioner according to the operation load information includes:
determining the evaporation temperature to be selected according to the operation load value;
and determining the target evaporation temperature according to the load change trend and the evaporation temperature to be selected.
Optionally, the multi-split air conditioner comprises an outdoor unit and a plurality of indoor units, wherein the operation load value comprises a capacity ratio between the activated effective total capacity of the indoor units and the nominal capacity of the outdoor unit; the step of determining the evaporation temperature to be selected according to the operation load value comprises the following steps:
comparing the capacity ratio with a pre-stored ratio interval, and determining a current ratio interval in which the capacity ratio is located;
and obtaining a first to-be-selected evaporation temperature and a second to-be-selected evaporation temperature corresponding to the current ratio interval according to the current ratio interval and a mapping relation between the preset ratio interval and the to-be-selected evaporation temperature, wherein the first to-be-selected evaporation temperature and the second to-be-selected evaporation temperature are used as to-be-selected evaporation temperatures.
Optionally, the step of determining the target evaporation temperature according to the load variation trend and the candidate evaporation temperature includes:
when the load change trend is a descending trend, taking the first to-be-selected evaporation temperature as a target evaporation temperature;
and when the load change trend is an ascending trend, taking the second to-be-selected evaporation temperature as a target evaporation temperature, wherein the second to-be-selected evaporation temperature is smaller than the first to-be-selected evaporation temperature.
Optionally, the step of determining the target evaporation temperature of the multi-split air conditioner according to the operation load information includes:
judging whether the running load value is larger than or equal to a preset load upper limit value or not;
and if the running load value is greater than or equal to a preset load upper limit value, taking a preset minimum target evaporation temperature corresponding to the preset load upper limit value as a target evaporation temperature.
Optionally, the step of determining the target evaporation temperature of the multi-split air conditioner according to the operation load information further includes:
judging whether the running load value is smaller than a preset load lower limit value or not;
and if the running load value is smaller than the preset load lower limit value, taking the preset maximum target evaporation temperature corresponding to the preset load lower limit value as the target evaporation temperature.
Optionally, the multi-split air conditioner includes an outdoor unit and a plurality of indoor units, and the step of obtaining the operation load information and the low-pressure evaporation temperature of the multi-split air conditioner includes:
detecting an operation state of the indoor unit, wherein the operation state comprises enabled and disabled;
acquiring the running total capacity of the indoor unit and the nominal capacity of the outdoor unit, wherein the running state is started, and calculating the capacity ratio between the running total capacity and the nominal capacity to be used as running load information;
and collecting the low-pressure evaporation pressure of the outdoor unit, and obtaining the corresponding low-pressure evaporation temperature according to the low-pressure evaporation pressure.
Optionally, the step of adjusting the operation frequency of the compressor of the multi-split air conditioner according to the target evaporation temperature and the low-pressure evaporation temperature includes:
when the low-pressure evaporation temperature is higher than the target evaporation temperature, the operation frequency of the compressor of the multi-split air conditioner is increased according to the temperature difference value between the low-pressure evaporation temperature and the target evaporation temperature;
and when the low-pressure evaporation temperature is lower than the target evaporation temperature, reducing the operation frequency of the compressor of the multi-split air conditioner according to the temperature difference value between the low-pressure evaporation temperature and the target evaporation temperature.
In addition, in order to achieve the above purpose, the present invention also provides a multi-split air conditioner, which comprises an outdoor unit, a plurality of indoor units, a low-voltage sensor, a memory, a processor, and a multi-split air conditioner control program stored on the memory and capable of running on the processor, wherein the processor implements the method as described in any one of the above when executing the multi-split air conditioner control program.
In addition, in order to achieve the above object, the present invention further provides a computer readable storage medium having stored thereon a multi-split air conditioner control program, which when executed by a processor, implements the method as set forth in any one of the above.
The invention provides a control method of a multi-split air conditioner, which can determine the load condition of the multi-split air conditioner by acquiring the operation load information of the multi-split air conditioner and the acquired low-pressure evaporation temperature of an outdoor unit. And further, according to the operation load information, determining a target evaporation temperature of the multi-split air conditioner, wherein the higher the operation load of the multi-split air conditioner is, the larger the system pressure drop is, and the lower the collected low-pressure evaporation temperature is relative to the actual evaporation temperature of the indoor unit, so that the target evaporation temperature can be inversely related to the operation load of the multi-split air conditioner, and the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature can be close to the actual temperature difference. And finally, adjusting the operation frequency of the compressors of the multi-split air conditioner according to the target evaporation temperature and the low-pressure evaporation temperature. Therefore, the target evaporation temperature is determined according to the operation load information of the multi-split air conditioner, and the operation frequency of the compressor is controlled based on the target evaporation temperature and the low-pressure evaporation temperature, so that the problem that the actual evaporation temperature of the indoor unit cannot be accurately fed back by the low-pressure evaporation temperature of the outdoor unit, and the deviation exists in refrigeration output is avoided, and the refrigeration output of the multi-split air conditioner is more accurate.
Drawings
Fig. 1 is a system configuration diagram of a multi-split air conditioner according to the present invention;
FIG. 2 is a schematic diagram of a device architecture of a hardware operating environment according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating a control method of a multi-split air conditioner according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a control method of a multi-split air conditioner according to another embodiment of the present invention;
FIG. 5 is a graph showing an exemplary relationship between the operating load value and the target evaporating temperature according to the present invention;
FIG. 6 is an exemplary diagram of one embodiment of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the prior art, in the process of refrigeration operation, a low-pressure sensor of an outdoor unit is generally adopted at present to collect a pressure value, then a corresponding low-pressure evaporation temperature is calculated based on the collected pressure value, then the low-pressure evaporation temperature is used as the evaporation temperature of an indoor unit, when the low-pressure evaporation temperature is higher than a target evaporation temperature, the frequency of a compressor is increased, and when the low-pressure evaporation temperature is lower than the target evaporation temperature, the frequency of the compressor is reduced, so that the refrigeration output of the multi-split air conditioner is adjusted.
However, in the actual use process, pressure drops of the system pipelines and components exist, when the indoor units of the multi-split air conditioner system are different in number or different in capacity of the indoor units, the refrigerant flow is inconsistent, and at the moment, the more the indoor units are opened, the larger the capacity is, the larger the pressure drop of the system is, namely the low-pressure evaporation temperature is lower than the actual evaporation temperature of the indoor units. Therefore, the low-pressure evaporating temperature cannot be accurately fed back to the evaporating temperature of the indoor unit, and there is a deviation in refrigerating output such as insufficient refrigerating or excessive refrigerating.
The invention provides the solution, which aims to solve the problem that the low-pressure evaporation temperature of the outdoor unit cannot accurately feed back the evaporation temperature of the indoor unit, so that the deviation exists in the refrigeration output, and improve the accuracy of the refrigeration output.
The embodiment of the invention provides a multi-split air conditioner.
Referring to fig. 1, fig. 1 is a system configuration diagram of a multi-split air conditioner according to the present invention. The multi-split air conditioner system is generally formed by combining one outdoor unit and a plurality of indoor units, wherein 4 indoor units (namely indoor heat exchangers in the figure) are shown in the figure, and more or fewer indoor units can be adopted. The multi-split air conditioner can obtain corresponding operation load information by detecting the operation state of the indoor unit, and the low-pressure evaporation pressure of the outdoor unit is detected by the low-pressure sensor so as to calculate the corresponding low-pressure evaporation temperature. It will be appreciated by those skilled in the art that the multi-split air conditioner may include fewer or more components and devices in the system configuration, such as an outdoor unit throttling device, an indoor unit throttling device, and the like.
Referring to fig. 2, fig. 2 is a schematic device structure diagram of a hardware running environment according to an embodiment of the present invention.
As shown in fig. 2, the multi-split air conditioner may include: a communication bus 1002, a processor 1001 such as a CPU, a user interface 1003, a network interface 1004, a memory 1005, and a low voltage sensor 1006. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above. The low pressure sensor 1006 is used for collecting the low pressure evaporation temperature of the outdoor unit.
It will be appreciated by those skilled in the art that the multi-split air conditioner configuration shown in fig. 2 is not limiting and may include more or fewer components than shown, or may combine certain components, or may be a different arrangement of components.
In the multi-split air conditioner shown in fig. 2, the network interface 1004 is mainly used for connecting to a background server and performing data communication with the background server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; the processor 1001 may be configured to invoke the control program of the air conditioner stored in the memory 1005 and execute the relevant steps in the embodiments of the multi-split air conditioner control method described above.
The invention provides a control method of a multi-split air conditioner, which is applied to the multi-split air conditioner. Referring to fig. 3, fig. 3 is a flow chart of an embodiment of a control method of a multi-split air conditioner according to the present invention, the method includes the steps of:
step S100, obtaining operation load information and low-pressure evaporation temperature of a multi-split air conditioner;
specifically, the operation load information may include an operation load value, such as a total operation capacity of the activated indoor units (i.e., a sum of capacities of the activated indoor units), a capacity ratio of the total operation capacity to a nominal capacity of the outdoor unit, and/or a number of activated indoor units, a number ratio of the number of activated indoor units to the total number of indoor units, etc. The capacity of the activated indoor unit may be a rated capacity, or may be a real-time capacity. In addition, the operating load information may further include a load change trend, that is, a change trend of the operating load value, such as an ascending trend and a descending trend, and the load change trend may be obtained by analyzing numerical value change information of the operating load value. The indoor units of the multi-split air conditioner can be monitored in real time or in a period with preset duration, so that the running load values such as the running total capacity, the capacity ratio, the running number, the quantity ratio and the like of the started indoor units and the corresponding running load information such as the load change trend and the like are obtained, the low-pressure evaporation pressure of the outdoor unit is collected through a preset low-pressure sensor, and the low-pressure evaporation pressure is converted into the low-pressure evaporation temperature through calculation, so that the low-pressure evaporation temperature is obtained.
Further, the multi-split air conditioner includes an outdoor unit and a plurality of indoor units, and the step S100 may include the steps of:
step S110, detecting the operation state of the indoor unit, wherein the operation state comprises enabled and disabled;
step S120, obtaining the running total capacity of the indoor unit and the nominal capacity of the outdoor unit, wherein the running state is started, and calculating the capacity ratio between the running total capacity and the nominal capacity to be used as running load information;
step S130, collecting the low-pressure evaporation pressure of the outdoor unit, and obtaining a corresponding low-pressure evaporation temperature according to the low-pressure evaporation pressure.
Specifically, the running states of all indoor units in the multi-split air conditioner can be detected, wherein the running states comprise started and non-started, the running total capacity of the indoor units with the running states being started is obtained, and the running total capacity can be the sum of rated capacities of the indoor units which are started or the sum of real-time capacities of the indoor units which are started. And then obtaining the nominal capacity of the outdoor unit of the multi-split air conditioner, and calculating the capacity ratio between the total running capacity of the indoor units and the nominal capacity of the outdoor unit. When the capacities of the indoor units are different, the running load condition of the multi-split air conditioner is obviously subject to a certain error through the started quantity information of the indoor units. In this embodiment, by detecting the operation state of the indoor unit, a capacity ratio between the total operation capacity of the indoor unit and the nominal capacity of the outdoor unit is obtained, which obviously can reflect the operation load condition of the indoor unit more accurately. Then, the low pressure evaporating pressure of the outdoor unit may be collected based on a preset low pressure sensor, and the low pressure evaporating pressure may be converted into a corresponding low pressure evaporating temperature according to a preset pressure-temperature mapping table.
Step S200, determining the target evaporation temperature of the multi-split air conditioner according to the operation load information;
specifically, a mapping relationship between the operation load information and the target evaporation temperature may be pre-established, and the target evaporation temperature corresponding to the operation load information of the multi-split air conditioner is obtained through the mapping relationship. For example, a mapping table of one or more than one information of the running total capacity, the capacity ratio, the running number, the number ratio and the running load value and the target evaporation temperature may be pre-established, so that the target evaporation temperature corresponding to the running load value may be obtained according to the running load value in the running load information and the pre-established mapping table. Wherein the target evaporation temperature is inversely related to the operation load value in the operation load information, that is, the higher the operation load value is, the lower the target evaporation temperature is. Therefore, the higher the operation load value is, the lower the low-pressure evaporation temperature is compared with the actual evaporation temperature, the temperature difference between the collected low-pressure evaporation temperature and the selected target evaporation temperature can be made to be close to the actual temperature difference between the actual evaporation temperature and the corresponding target evaporation temperature by selecting the lower target evaporation temperature, and the problem that the calculated temperature difference is deviated from the actual temperature difference due to the influence of the operation load on the low-pressure evaporation temperature of the multi-split air conditioner is avoided.
And step S300, adjusting the operation frequency of the compressors of the multi-split air conditioner according to the target evaporation temperature and the low-pressure evaporation temperature.
Specifically, the operation frequency of the compressors of the multi-split air conditioner may be adjusted according to the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature. When the low-pressure evaporation temperature is higher than the target evaporation temperature, the operation frequency of a compressor is increased so as to enhance the refrigeration output of the multi-split air conditioner; and when the low-pressure evaporation temperature is lower than the target evaporation temperature, reducing the operation frequency of the compressor so as to weaken the refrigeration output of the multi-split air conditioner. Because the target evaporating temperature is the target evaporating temperature corresponding to the operating load information, the temperature difference between the low-pressure evaporating temperature and the target evaporating temperature is close to the actual temperature difference, so that the adjustment range of the operating frequency of the compressor is more accurate, and the refrigerating output of the multi-split air conditioner is more accurate.
Still further, the step S300 further includes the steps of:
step S310, when the low-pressure evaporation temperature is higher than the target evaporation temperature, the operation frequency of the compressor of the multi-split air conditioner is increased according to the temperature difference value between the low-pressure evaporation temperature and the target evaporation temperature;
step S320, when the low-pressure evaporating temperature is lower than the target evaporating temperature, reducing the operating frequency of the compressor of the multi-split air conditioner according to the temperature difference between the low-pressure evaporating temperature and the target evaporating temperature.
Specifically, when the low-pressure evaporation temperature is higher than the target evaporation temperature, it is indicated that the multi-split air conditioner is not sufficiently cooled, and the operation frequency of the compressor of the multi-split air conditioner needs to be increased according to the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature so as to enhance the refrigeration output of the multi-split air conditioner. When the low-pressure evaporation temperature is lower than the target evaporation temperature, the compressor running frequency of the multi-split air conditioner is reduced according to the temperature difference value between the low-pressure evaporation temperature and the target evaporation temperature to weaken the refrigeration output of the multi-split air conditioner, so that the refrigeration output of the multi-split air conditioner is regulated. When the low pressure evaporation temperature is equal to the target evaporation temperature, it may be unnecessary to adjust the operating frequency of the compressor. In this embodiment, the manner of adjusting (increasing/decreasing) the operating frequency of the compressor of the multi-split air conditioner may be to query a preset frequency correction lookup table according to the temperature difference value, so as to obtain a frequency correction value corresponding to the temperature difference value. And further obtaining the current operating frequency of the compressor, calculating the target operating frequency according to the frequency correction value and the current operating frequency, and controlling the compressor to operate at the target operating frequency. Of course, the manner of adjusting the operation frequency of the compressors of the multi-split air conditioner is not limited in this embodiment.
In an embodiment of the invention, the load condition of the multi-split air conditioner can be determined by acquiring the operation load information of the multi-split air conditioner and the acquired low-pressure evaporation temperature of the outdoor unit. And further, according to the operation load information, determining a target evaporation temperature of the multi-split air conditioner, wherein the higher the operation load of the multi-split air conditioner is, the larger the system pressure drop is, and the lower the collected low-pressure evaporation temperature is relative to the actual evaporation temperature of the indoor unit, so that the target evaporation temperature can be inversely related to the operation load of the multi-split air conditioner, and the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature can be close to the actual temperature difference. And finally, adjusting the operation frequency of the compressors of the multi-split air conditioner according to the target evaporation temperature and the low-pressure evaporation temperature. Therefore, the target evaporation temperature determined according to the operation load information of the multi-split air conditioner is further used for controlling the operation frequency of the compressor based on the target evaporation temperature and the low-pressure evaporation temperature, so that the problem that the actual evaporation temperature of the indoor unit cannot be accurately fed back to the low-pressure evaporation temperature of the outdoor unit, and the deviation exists in refrigeration output is avoided, and the refrigeration output of the multi-split air conditioner is more accurate.
Further, referring to fig. 4, another embodiment of the present invention provides a control method of a multi-split air conditioner, based on the embodiment shown in fig. 3, step S200 further includes the following steps:
step S210, determining a to-be-selected evaporation temperature according to the operation load value;
step S220, determining the target evaporation temperature according to the load variation trend and the evaporation temperature to be selected.
Specifically, the operation load information may include an operation load value and a load variation trend. According to the embodiment, on the basis of the operation load value, the corresponding target evaporation temperature can be selected by combining the load change trend (namely, the change trend of the operation load value). If the operation load information is obtained through real-time or setting a period with a preset duration, the operation load information can be compared with the current operation load value according to the historical load value of the last time or the previous period, so that a corresponding load change trend is obtained, wherein the load change trend can comprise a descending trend and an ascending trend. The initial startup of the multi-split air conditioner can default the load change trend to be an ascending trend.
The preset number of continuous load intervals can be pre-stored in the embodiment, the load intervals correspond to preset evaporation temperatures to be selected, wherein the number and the span of the load intervals can be selected according to specific requirements, and the evaporation temperatures to be selected can be one or more than one temperature value. And determining a load interval in which the operation load value is positioned according to the operation load value, and further taking the target evaporation temperature corresponding to the load interval as a candidate evaporation temperature. When the load change trend is a descending trend, the collected low-pressure evaporation temperature gradually rises, so that a higher evaporation temperature to be selected can be selected as a target evaporation temperature; when the load change trend is an ascending trend, the collected low-pressure evaporation temperature of the outdoor unit gradually decreases, so that the lower evaporation temperature to be selected can be selected as the target evaporation temperature, the changed low-pressure evaporation temperature is matched with the target evaporation temperature, the situation that the operation frequency of the compressor decreases due to the decrease of the low-pressure evaporation temperature when the operation load increases, and the refrigeration output such as the increase of the operation frequency of the compressor deviates from the refrigeration requirement of a user due to the increase of the low-pressure evaporation temperature when the operation load decreases is avoided. Of course, the target evaporation temperature may be a lower candidate evaporation temperature when the load change trend is a decreasing trend, and the target evaporation temperature may be a higher candidate evaporation temperature when the load change trend is an increasing trend, so as to reduce the frequency of the target evaporation temperature change.
In this embodiment, the evaporation temperature to be selected is determined according to the operation load value. And then, selecting a target evaporation temperature which accords with the low-pressure evaporation temperature change trend from the evaporation temperatures to be selected according to the load change trend, thereby avoiding the conditions of frequency reduction when the starting number and/or capacity of the indoor units are increased, frequency increase when the starting number and/or capacity of the indoor units are reduced, and the like. In this embodiment, the target evaporation temperature may be selected based on the operation load value in combination with the load variation trend, so that the refrigeration output of the multi-split air conditioner is more matched with the refrigeration requirement changed by the user.
Still further, step S210 further includes the steps of:
step S211, comparing the capacity ratio with a pre-stored ratio interval, and determining a current ratio interval in which the capacity ratio is located;
step S212, according to the current ratio interval and the mapping relation between the preset ratio interval and the evaporation temperature to be selected, obtaining a first evaporation temperature to be selected and a second evaporation temperature to be selected corresponding to the current ratio interval as evaporation temperatures to be selected.
Specifically, when the operation load information may include a capacity ratio between an operation total capacity of the indoor unit and a nominal capacity of the outdoor unit. A preset number of consecutive ratio intervals may be pre-stored so that a current ratio interval in which the capacity ratio is located may be determined. And then, according to the current ratio interval and the mapping relation between the preset ratio interval and the evaporation temperature to be selected, obtaining a first evaporation temperature to be selected and a second evaporation temperature to be selected, which correspond to the current ratio interval, as the evaporation temperature to be selected. Referring to fig. 5, fig. 5 is a diagram showing an exemplary mapping relationship between an operating load value and a target evaporation temperature according to the present invention. The pre-stored ratio interval may be 0, p 1 ％)、[P 1 ％，P 2 ％)、[P 2 ％，P 3 ％)、[P 3 ％，P 4 ％)、[P 4 ％，100％]The mapping relationship between the preset ratio and the target evaporation temperature may be the corresponding relationship between the end points of each ratio interval and the evaporation temperature to be selected, namely P 1 % corresponds to T 1 、P 2 % corresponds to T 2 、P 3 % corresponds to T 3 、P 4 % corresponds to T 4 . Therefore, the corresponding candidate evaporating temperature can be obtained through the current ratio interval. For example, when the ratio interval corresponding to the capacity ratio is [ P ] 1 ％，P 2 In percent), the first evaporating temperature T to be selected corresponding to the ratio interval can be obtained 1 And a second candidate evaporation temperature T 2 。
Still further, step S220 further includes the steps of:
step S221, when the load change trend is a descending trend, taking the first evaporation temperature to be selected as a target evaporation temperature;
and step S222, when the load variation trend is an ascending trend, taking the second candidate evaporation temperature as a target evaporation temperature, wherein the second candidate evaporation temperature is smaller than the first candidate evaporation temperature.
Specifically, the second candidate evaporation temperature is smaller than the first candidate evaporation temperature. When the load change trend is a decreasing trend (such as the situation that the number of indoor units is started or the capacity is reduced), the low-pressure evaporation temperature of the outdoor unit gradually increases due to the decrease of the system pressure drop, so that a higher evaporation temperature to be selected (namely, a first evaporation temperature to be selected) from the evaporation temperatures to be selected can be selected as the target evaporation temperature. Therefore, the situation that the frequency of the compressor is increased due to the fact that the temperature difference between the low-pressure evaporating temperature and the previous target evaporating temperature is increased due to the fact that the low-pressure evaporating temperature is gradually increased is avoided, and the refrigerating output of the multi-split air conditioner is larger than the refrigerating requirement of a user after the refrigerating output of the multi-split air conditioner is reduced is avoided. When the load change trend is an ascending trend (such as the situation that the starting number and/or capacity of the indoor units are increased), the low-pressure evaporation temperature of the outdoor unit is gradually reduced due to the increase of the system pressure drop, so that a lower evaporation temperature to be selected (namely, a second evaporation temperature to be selected) from the evaporation temperatures to be selected can be used as the target evaporation temperature. Therefore, the situation that the frequency of the compressor is reduced due to the fact that the temperature difference between the low-pressure evaporating temperature and the previous target evaporating temperature is reduced due to the fact that the low-pressure evaporating temperature is gradually reduced is avoided, and the refrigerating output of the multi-split air conditioner is smaller than the refrigerating requirement after the user increases.
In this embodiment, when the load variation trend is a decreasing trend, a first candidate evaporation temperature (i.e., a higher candidate evaporation temperature) is selected as the target evaporation temperature; and when the load change trend is an ascending trend, selecting a second candidate evaporation temperature (namely a lower candidate evaporation temperature) as the target evaporation temperature. And selecting a target evaporation temperature according to the load change trend on the basis of the operation load value, so that the refrigeration output of the multi-split air conditioner is more matched with the refrigeration requirement changed by a user.
Still further, in another embodiment, the step S200 further includes the steps of:
step S230, judging whether the operation load value is larger than or equal to a preset load upper limit value;
in step S231, if the running load value is greater than or equal to the preset load upper limit value, the preset minimum target evaporation temperature corresponding to the preset load upper limit value is used as the target evaporation temperature.
Specifically, the preset load upper limit value may be an upper limit of the operation load value set in advance by a manufacturer according to specific requirements or experience, and, taking a capacity ratio as an example, the preset load upper limit value may be 75%, 80%, 85% or the like. When the running load value reaches or exceeds the preset load upper limit value, the preset load upper limit value corresponding to the preset minimum target evaporation temperature can be directly used as the target evaporation temperature. The preset minimum target evaporation temperature is the minimum target evaporation temperature corresponding to the preset load upper limit value. When the running load value reaches or exceeds the preset load upper limit value, the system pressure drop of the multi-split air conditioner is extremely large, so that the low-pressure evaporation temperature of the outdoor unit is far lower than the actual evaporation temperature of the indoor unit, the preset minimum target evaporation temperature can be selected as the target evaporation temperature, the refrigeration output of the multi-split air conditioner can be ensured to be matched with the higher refrigeration requirement of a user, and meanwhile, when the running load value reaches or exceeds the preset load upper limit value, the target evaporation temperature is not required to be frequently adjusted, so that the control convenience of the multi-split air conditioner is improved.
Still further, in another embodiment, the step S200 further includes the steps of:
step S240, judging whether the operation load value is smaller than a preset load lower limit value;
step S241, if the running load value is smaller than the preset load lower limit value, taking the preset maximum target evaporation temperature corresponding to the preset load lower limit value as the target evaporation temperature.
Specifically, the preset load lower limit value may be a lower limit of the running load value set by a manufacturer in advance according to specific requirements or experience, and, taking a capacity ratio as an example, the preset load lower limit value may be 50%, 40%, 30% or the like. And when the operation load value is lower than the preset load upper limit value, the preset load lower limit value corresponding to the preset maximum target evaporation temperature can be directly used as the target evaporation temperature. The preset maximum target evaporation temperature is the maximum target evaporation temperature corresponding to the preset load shrimp limit value. When the operation load value is lower than the preset load lower limit value, the system pressure drop of the multi-split air conditioner is smaller, so that the difference between the low-pressure evaporation temperature of the outdoor unit and the actual evaporation temperature of the indoor unit is smaller, the low-pressure evaporation temperature can be used as the actual evaporation temperature of the indoor unit, the preset maximum target evaporation temperature can be used as the target evaporation temperature, the target evaporation temperature does not need to be frequently adjusted, and the control convenience of the multi-split air conditioner is improved.
In addition, referring to fig. 6, fig. 6 is an exemplary diagram of an embodiment of the present invention. In this embodiment, the operating load value is the ratio of the capacity of the indoor unit that is needed (i.e., the total capacity of the indoor unit that has been activated) to the nominal capacity of the outdoor unit. When the duty ratio is greater than or equal to 75%, the target evaporation temperature is selected to be Ae1; when the duty ratio is less than 50%, the target evaporation temperature is selected as Ae; when the duty ratio is less than 75% and greater than or equal to 50%, further judging the change trend of the duty ratio, and if the change trend of the duty ratio is an ascending trend, selecting the target evaporation temperature as Ae1; if the change trend of the duty ratio is a descending trend, the target evaporation temperature is selected as Ae; wherein Ae1 is less than Ae.
In addition, the embodiment of the invention also provides a computer readable storage medium, wherein the computer readable storage medium is stored with a multi-split air conditioner control program, and the related steps of any embodiment of the multi-split air conditioner control method are realized when the multi-split air conditioner control program is executed by a processor.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (10)

1. The control method of the multi-split air conditioner is characterized by comprising the following steps of:
acquiring operation load information and low-pressure evaporation temperature of a multi-split air conditioner;
determining a target evaporation temperature of the multi-split air conditioner according to the operation load information;
and adjusting the operation frequency of the compressors of the multi-split air conditioner according to the target evaporation temperature and the low-pressure evaporation temperature.
2. The method for controlling a multi-split air conditioner as claimed in claim 1, wherein the operation load information includes an operation load value and a load variation trend, and the step of determining the target evaporation temperature of the multi-split air conditioner according to the operation load information includes:
determining the evaporation temperature to be selected according to the operation load value;
and determining the target evaporation temperature according to the load change trend and the evaporation temperature to be selected.
3. The method of controlling a multi-split air conditioner according to claim 2, wherein the multi-split air conditioner includes an outdoor unit and a plurality of indoor units, and the operation load value includes a capacity ratio between an activated effective total capacity of the indoor units and a nominal capacity of the outdoor unit; the step of determining the evaporation temperature to be selected according to the operation load value comprises the following steps:
comparing the capacity ratio with a pre-stored ratio interval, and determining a current ratio interval in which the capacity ratio is located;
and obtaining a first to-be-selected evaporation temperature and a second to-be-selected evaporation temperature corresponding to the current ratio interval according to the current ratio interval and a mapping relation between the preset ratio interval and the to-be-selected evaporation temperature, wherein the first to-be-selected evaporation temperature and the second to-be-selected evaporation temperature are used as to-be-selected evaporation temperatures.
4. The method for controlling a multi-split air conditioner as claimed in claim 3, wherein the step of determining the target evaporation temperature according to the load variation trend and the candidate evaporation temperature comprises:
when the load change trend is a descending trend, taking the first to-be-selected evaporation temperature as a target evaporation temperature;
and when the load change trend is an ascending trend, taking the second to-be-selected evaporation temperature as a target evaporation temperature, wherein the second to-be-selected evaporation temperature is smaller than the first to-be-selected evaporation temperature.
5. The method for controlling a multi-split air conditioner as claimed in claim 2, wherein the step of determining the target evaporation temperature of the multi-split air conditioner according to the operation load information comprises:
judging whether the running load value is larger than or equal to a preset load upper limit value or not;
and if the running load value is greater than or equal to a preset load upper limit value, taking a preset minimum target evaporation temperature corresponding to the preset load upper limit value as a target evaporation temperature.
6. The method for controlling a multi-split air conditioner as claimed in claim 2, wherein the step of determining the target evaporation temperature of the multi-split air conditioner according to the operation load information further comprises:
judging whether the running load value is smaller than a preset load lower limit value or not;
and if the running load value is smaller than the preset load lower limit value, taking the preset maximum target evaporation temperature corresponding to the preset load lower limit value as the target evaporation temperature.
7. The method for controlling a multi-split air conditioner as claimed in claim 1, wherein the multi-split air conditioner includes an outdoor unit and a plurality of indoor units, and the step of obtaining the operation load information and the low pressure evaporation temperature of the multi-split air conditioner includes:
detecting an operation state of the indoor unit, wherein the operation state comprises enabled and disabled;
acquiring the running total capacity of the indoor unit and the nominal capacity of the outdoor unit, wherein the running state is started, and calculating the capacity ratio between the running total capacity and the nominal capacity to be used as running load information;
and collecting the low-pressure evaporation pressure of the outdoor unit, and obtaining the corresponding low-pressure evaporation temperature according to the low-pressure evaporation pressure.
8. The control method of the multi-split air conditioner as claimed in any one of claims 1 to 7, wherein the step of adjusting the operation frequency of the compressor of the multi-split air conditioner according to the target evaporation temperature and the low-pressure evaporation temperature comprises:
when the low-pressure evaporation temperature is higher than the target evaporation temperature, the operation frequency of the compressor of the multi-split air conditioner is increased according to the temperature difference value between the low-pressure evaporation temperature and the target evaporation temperature;
and when the low-pressure evaporation temperature is lower than the target evaporation temperature, reducing the operation frequency of the compressor of the multi-split air conditioner according to the temperature difference value between the low-pressure evaporation temperature and the target evaporation temperature.
9. A multi-split air conditioner, characterized in that the multi-split air conditioner comprises an outdoor unit and a plurality of indoor units, and further comprises a low-voltage sensor, a memory, a processor and a multi-split air conditioner control program which is stored on the memory and can run on the processor, wherein the processor realizes the method of any one of claims 1 to 8 when executing the multi-split air conditioner control program.
10. A computer readable storage medium, having stored thereon a multi-split air conditioner control program which when executed by a processor implements the method of any one of claims 1 to 8.
CN202210329808.9A 2022-03-31 2022-03-31 Multi-split air conditioner control method, multi-split air conditioner and readable storage medium Pending CN116928734A (en)

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Application Number Priority Date Filing Date Title
CN202210329808.9A CN116928734A (en) 2022-03-31 2022-03-31 Multi-split air conditioner control method, multi-split air conditioner and readable storage medium

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CN116928734A true CN116928734A (en) 2023-10-24

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