CN116857779A - Control method of multi-split air conditioner, multi-split air conditioner and storage medium - Google Patents

Control method of multi-split air conditioner, multi-split air conditioner and storage medium Download PDF

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Publication number
CN116857779A
CN116857779A CN202310797625.4A CN202310797625A CN116857779A CN 116857779 A CN116857779 A CN 116857779A CN 202310797625 A CN202310797625 A CN 202310797625A CN 116857779 A CN116857779 A CN 116857779A
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China
Prior art keywords
temperature
air conditioner
split air
temperature difference
target temperature
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Pending
Application number
CN202310797625.4A
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Chinese (zh)
Inventor
邵艳坡
牛嘉佳
晏璐
程历
陈磊
欧汝浩
吴信宇
刘和成
李健锋
杨亚新
王章立
廖振华
武运动
刘帅帅
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Priority to CN202310797625.4A priority Critical patent/CN116857779A/en
Publication of CN116857779A publication Critical patent/CN116857779A/en
Pending legal-status Critical Current

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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
    • F24F11/62—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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • F24F11/47—Responding to energy costs
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature

Abstract

The invention discloses a control method of a multi-split air conditioner, the multi-split air conditioner and a storage medium. Wherein the method comprises the following steps: acquiring the indoor temperature of each opened indoor unit adjusting space in the multi-split air conditioner and the initial target temperature of the multi-split air conditioner, wherein the initial target temperature is a target value which is required to be reached at present and represents the characteristic temperature of heat energy efficiency of the multi-split air conditioner; determining a temperature difference value between the indoor temperature and a corresponding set temperature, and determining a new target temperature corresponding to the characteristic temperature according to each temperature difference value and the initial target temperature; and controlling the multi-split air conditioner to operate according to the new target temperature. The invention aims to improve the energy efficiency of the multi-split air conditioner and improve the indoor comfort.

Description

Control method of multi-split air conditioner, multi-split air conditioner and storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of a multi-split air conditioner, the multi-split air conditioner and a storage medium.
Background
The multi-split air conditioner generally comprises an outdoor unit and at least two indoor units, wherein the condensing temperature or the evaporating temperature can represent the heat exchange energy efficiency of the system, the control is generally carried out based on the target condensing temperature or the target evaporating temperature during operation, and when the actual condensing temperature deviates from the target condensing temperature or the actual evaporating temperature deviates from the target evaporating temperature, the actual temperature reaches the corresponding target temperature through the adjustment of the operating parameters of components.
However, the target condensation temperature or the target evaporation temperature in the current multi-split air conditioning system is generally a fixed value obtained based on laboratory tests, which can lead to the fact that the indoor heat exchanger coil and the indoor air temperature are always kept at a higher heat exchange temperature difference in the operation process, so that the energy efficiency is reduced, the system is frequently started and stopped, and the indoor comfort is affected.
Disclosure of Invention
The invention mainly aims to provide a control method of a multi-split air conditioner, the multi-split air conditioner and a storage medium, and aims to improve the energy efficiency of the multi-split air conditioner and improve indoor comfort.
In order to achieve the above object, the present invention provides a control method of a multi-split air conditioner, the control method of the multi-split air conditioner comprising the following steps:
acquiring the indoor temperature of each opened indoor unit adjusting space in the multi-split air conditioner and the initial target temperature of the multi-split air conditioner, wherein the initial target temperature is a target value which is required to be reached at present and represents the characteristic temperature of heat energy efficiency of the multi-split air conditioner;
determining a temperature difference value between the indoor temperature and a corresponding set temperature, and determining a new target temperature corresponding to the characteristic temperature according to each temperature difference value and the initial target temperature;
And controlling the multi-split air conditioner to operate according to the new target temperature.
Optionally, the step of determining a new target temperature corresponding to the characteristic temperature according to each temperature difference value and the initial target temperature includes:
determining the control temperature difference of all the opened indoor units according to each temperature difference value and the corresponding target weight of the indoor unit;
determining a first temperature adjustment value according to the control temperature difference;
and adjusting the initial target temperature according to the first temperature adjustment value to obtain the new target temperature.
Optionally, before the step of determining the control temperature differences of all the opened indoor units according to each temperature difference value and the target weight of the corresponding indoor unit, the method further includes:
acquiring the operation time length of each indoor unit;
and determining the target weight corresponding to each indoor unit according to all the operation time lengths.
Optionally, the step of determining a new target temperature corresponding to the characteristic temperature according to each temperature difference value and the initial target temperature includes:
determining a reference temperature difference corresponding to a heat exchange mode of the multi-split air conditioner currently running in all the temperature differences;
when the reference temperature difference is within a preset temperature difference interval, determining that the initial target temperature is the new target temperature;
And when the reference temperature difference is out of the preset temperature difference interval, increasing or decreasing the initial target temperature according to the magnitude relation between the reference temperature difference and the preset temperature difference interval to obtain the new target temperature.
Optionally, the step of determining the reference temperature difference corresponding to the heat exchange mode of the multi-split air conditioner currently running in all the temperature differences includes:
when the multi-split air conditioner is in a current running refrigeration mode, determining the maximum value of all the temperature differences as the reference temperature difference;
and when the multi-split air conditioner currently operates in a heating mode, determining the minimum value in all the temperature differences as the reference temperature difference.
Optionally, the characteristic temperature includes an evaporation temperature, and the step of increasing or decreasing the initial target temperature according to the magnitude relation between the reference temperature difference and the preset temperature difference interval to obtain the new target temperature includes:
when the multi-split air conditioner is in a current running refrigeration mode and the reference temperature difference is smaller than the minimum temperature difference of the preset temperature difference interval, increasing the initial target temperature to obtain the new target temperature;
and when the multi-split air conditioner is in a current running refrigeration mode and the reference temperature difference is larger than the maximum temperature difference of the preset temperature difference interval, reducing the initial target temperature to obtain the new target temperature.
Optionally, the characteristic temperature includes a condensation temperature, and the step of increasing or decreasing the initial target temperature according to the magnitude relation between the reference temperature difference and the preset temperature difference interval to obtain the new target temperature includes:
when the multi-split air conditioner currently operates a heating mode and the reference temperature difference is smaller than the minimum temperature difference of the preset temperature difference interval, reducing the initial target temperature to obtain the new target temperature;
and when the multi-split air conditioner currently operates a heating mode and the reference temperature difference is larger than the maximum temperature difference of the preset temperature difference interval, increasing the initial target temperature to obtain the new target temperature.
Optionally, the step of obtaining the new target temperature by increasing or decreasing the initial target temperature according to the magnitude relation between the reference temperature difference and the preset temperature difference interval includes:
determining a second temperature adjustment value according to all the temperature difference values;
and increasing or decreasing the initial target temperature according to the magnitude relation and the second temperature adjustment value to obtain the new target temperature.
Optionally, when the multi-split air conditioner is in a heating mode, the characteristic temperature is a condensation temperature of the multi-split air conditioner; and when the multi-split air conditioner is in a refrigeration mode, the characteristic temperature is the evaporation temperature of the multi-split air conditioner.
Optionally, after the step of determining the temperature difference value between the indoor temperature and the corresponding set temperature and determining the new target temperature corresponding to the characteristic temperature according to each temperature difference value and the initial target temperature, the method further includes:
when the new target temperature is smaller than a preset temperature interval, taking the minimum temperature of the preset temperature interval as the new target temperature, and executing the step of controlling the multi-split air conditioner to operate according to the new target temperature;
when the new target temperature is greater than the preset temperature interval, taking the maximum temperature of the preset temperature interval as the new target temperature, and executing the step of controlling the multi-split air conditioner to operate according to the new target temperature;
and when the new target temperature is within the preset temperature interval, executing the step of controlling the multi-split air conditioner to operate according to the new target temperature.
In addition, in order to achieve the above objective, the present application further provides a multi-split air conditioner, which includes: the control method for the multi-split air conditioner comprises the steps of a memory, a processor and a control program of the multi-split air conditioner, wherein the control program is stored in the memory and can run on the processor, and the control method for the multi-split air conditioner is realized when the control program of the multi-split air conditioner is executed by the processor.
In addition, in order to achieve the above objective, the present application further provides a storage medium, where a control program of the multi-split air conditioner is stored, and when the control program of the multi-split air conditioner is executed by a processor, the steps of the control method of the multi-split air conditioner described in any one of the above are implemented.
The control method of the multi-split air conditioner provided by the application comprises the steps of determining the temperature difference value between the indoor temperature of each opened indoor unit and the corresponding set temperature, determining the new target temperature corresponding to the characteristic temperature according to the temperature difference value corresponding to each indoor unit and the current temperature corresponding to the characteristic temperature representing the heat exchange efficiency of the system, and controlling the multi-split air conditioner to operate according to the new target temperature, wherein in the process, the target value corresponding to the characteristic temperature for controlling the operation of the multi-split air conditioner is not a fixed numerical value any more, but can be adjusted according to the actual adjustment requirements of all indoor units, so that the active control of the temperature difference between the indoor heat exchanger and the indoor environment is realized, the irreversible loss in the heat exchange cycle is reduced, and the system energy efficiency is effectively improved; and the method is beneficial to prolonging the start-stop period of the system under low load, thereby reducing frequent start-stop of the system and ensuring indoor comfort.
Drawings
FIG. 1 is a schematic diagram of a hardware architecture involved in the operation of an embodiment of a multi-split air conditioner of the present invention;
FIG. 2 is a flow chart illustrating an embodiment of a control method of a multi-split air conditioner according to the present invention;
FIG. 3 is a flowchart illustrating a control method of a multi-split air conditioner according to another 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 flowchart illustrating a control method of a multi-split air conditioner according to another 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.
The embodiment of the invention provides a multi-split air conditioner.
In an embodiment of the present invention, referring to fig. 1, a multi-split air conditioner includes a control device 100, an outdoor unit 200, and at least two indoor units 300 connected to the outdoor unit 200, the at least two indoor units 300 being connected in parallel. The outdoor unit 200 and the indoor unit 300 are both connected to the control device 100, and the control device 100 may be provided in the indoor unit 300, in the outdoor unit 200, or in the indoor unit 300 and the outdoor unit 200.
Each indoor unit 300 includes an indoor heat exchanger, an indoor fan corresponding to the indoor heat exchanger, and an electronic expansion valve connected in series with the indoor heat exchanger. Different indoor units 300 are provided in different indoor spaces to adjust the environments of the different indoor spaces.
The outdoor unit 200 includes a throttle device, an outdoor heat exchanger, an outdoor fan corresponding to the outdoor heat exchanger, a reversing assembly, and a compressor.
The at least two indoor heat exchangers, the throttling device and the outdoor heat exchanger are sequentially connected, and the at least two indoor heat exchangers, the outdoor heat exchanger, the air return opening of the compressor and the air exhaust opening of the compressor are all connected with the reversing assembly.
Under the regulation action of the reversing component, the running modes of the multi-split air conditioner at least comprise the following two modes:
in the first mode, for example, the cooling mode, the reversing assembly is operated in the first operation state, and the refrigerant discharged from the compressor flows through the outdoor heat exchanger, the throttling device and the indoor heat exchanger in the indoor unit 300 in the opened state in sequence and then flows back to the compressor;
in the second mode, for example, the heating mode, the reversing assembly is operated in the second operation state, and the refrigerant discharged from the compressor flows through the indoor heat exchanger, the throttling device, and the outdoor heat exchanger in the indoor unit 300 in the opened state in sequence and then flows back to the compressor.
In other embodiments, the multi-split air conditioner may also be an air conditioner with a fixed operation mode, for example, the multi-split air conditioner may be an air conditioner with independent refrigeration, and an exhaust port, an outdoor heat exchanger, a throttling device, at least two indoor heat exchangers and an air return port of the compressor are sequentially connected; for example, the multi-split air conditioner can be an air conditioner for heating independently, and an exhaust port of the compressor, at least two indoor heat exchangers, a throttling device, an outdoor heat exchanger and an air return port of the compressor are connected in sequence.
Further, the indoor unit 300 is further provided with a temperature sensor 01 for detecting the indoor environment temperature of the indoor space, and the temperature sensor 01 may be disposed at the air return opening of the indoor unit 300. The temperature sensor 01 is connected to the control device 100.
In an embodiment of the present invention, referring to fig. 1, a control device 100 of a multi-split air conditioner includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Wherein the components are in communication via a communication bus connection. The memory 1002 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 may alternatively be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the device structure shown in fig. 1 is not limiting of the device and may include more or fewer components than shown, or may be combined with certain components, or a different arrangement of components.
As shown in fig. 1, a control program of the multi-split air conditioner may be included in a memory 1002 as a kind of computer storage medium.
In the apparatus shown in fig. 1, the processor 1001 may be configured to call a control program of the multi-split air conditioner stored in the memory 1002, and perform relevant step operations of a control method of the multi-split air conditioner in the following embodiments.
The embodiment of the application also provides a control method of the multi-split air conditioner, which is applied to the multi-split air conditioner.
Referring to fig. 2, an embodiment of a control method of a multi-split air conditioner according to the present application is provided. In this embodiment, the control method of the multi-split air conditioner includes:
step S10, acquiring the indoor temperature of each opened indoor unit adjusting space in the multi-split air conditioner and the initial target temperature of the multi-split air conditioner, wherein the initial target temperature is a target value which is required to be reached at present and represents the characteristic temperature of the heat energy efficiency of the multi-split air conditioner;
the starting refers specifically to the indoor unit starting a heat exchange mode (e.g., a cooling mode or a heating mode). The opening and closing of the heat exchange modes of different indoor units can be independently controlled according to the requirements of users. When the indoor unit is started, the electronic expansion valve in the indoor unit is started at an opening degree larger than the standby opening degree; when the indoor unit is closed, the electronic expansion valve in the indoor unit is opened at a standby opening degree.
The indoor temperature can be detected by a temperature sensor in the indoor unit.
When the multi-split air conditioner is in a heating mode, the characteristic temperature is the condensation temperature of the multi-split air conditioner; and when the multi-split air conditioner is in a refrigeration mode, the characteristic temperature is the evaporation temperature of the multi-split air conditioner. When the multi-split air conditioner is used for heating a mode, refrigerant discharged by the compressor flows through an indoor heat exchanger, a throttling device and an outdoor heat exchanger in the indoor unit in an open state in sequence and then flows back to the compressor; during the refrigerating mode of the multi-split air conditioner, the refrigerant discharged by the compressor flows through the outdoor heat exchanger, the throttling device and the indoor heat exchanger in the indoor unit in an opened state in sequence and then flows back to the compressor.
And in the process of controlling the operation of the multi-split air conditioner according to the initial target temperature, acquiring the indoor temperature of each opened indoor unit adjusting space in the multi-split air conditioner. The initial target temperature can be a preset fixed value, or can be a temperature value obtained after the preset fixed value is adapted to the actual running condition of the multi-split air conditioner before the current moment.
Step S20, determining a temperature difference value between the indoor temperature and a corresponding set temperature, and determining a new target temperature corresponding to the characteristic temperature according to each temperature difference value and the initial target temperature;
The set temperature is the target value which the corresponding indoor unit needs to achieve for adjusting the indoor temperature of the indoor space. Different indoor units can be set according to the actual demands of corresponding users. The set temperatures of the different indoor units may be the same or different.
In this embodiment, the new target temperature is determined according to the temperature difference between the indoor temperature and the corresponding set temperature and the initial target temperature, and the process of determining the new target temperature does not involve the outdoor environment parameter.
In this embodiment, the temperature difference is a calculation result obtained by subtracting the corresponding set temperature from the indoor temperature, that is, the temperature difference=indoor temperature-set temperature.
In one implementation, a temperature adjustment value is determined according to all the temperature difference values, and the initial target temperature is adjusted according to the temperature adjustment value to obtain a new target temperature. Wherein, a characteristic temperature difference value (for example, a reference temperature difference or a control temperature difference mentioned in the later embodiments, etc.) representing the load demands of all the opened indoor units may be determined according to all the temperature difference values, and a temperature adjustment value is determined based on the characteristic temperature difference value.
In another implementation, a corresponding sub-temperature adjustment value is determined according to each temperature difference value, the initial target temperature is adjusted according to the sub-temperature adjustment value to obtain a corresponding reference temperature, and a new target temperature is determined according to all the reference temperatures.
In yet another implementation, the temperature adjustment direction is determined based on all of the temperature difference values, and the initial target temperature is adjusted based on the temperature adjustment direction.
And step S30, controlling the multi-split air conditioner to operate according to the new target temperature.
In the process of controlling the operation of the multi-split air conditioner according to the new target temperature, detecting the current characteristic temperature of the multi-split air conditioner, and controlling the operation of target components (such as a compressor and/or an electronic expansion valve and the like) in the multi-split air conditioner according to the current characteristic temperature and the new target temperature.
When the current characteristic temperature is smaller than the new target temperature in the multi-split air conditioning hot mode, the compressor can be controlled to increase the frequency or the electronic expansion valve can be controlled to reduce the opening degree; when the current characteristic temperature is higher than the new target temperature, the compressor can be controlled to run at a reduced frequency or the electronic expansion valve can be controlled to run at an increased opening.
When the current characteristic temperature is higher than the new target temperature in the multi-split air conditioner refrigerating mode, the compressor can be controlled to increase the frequency or the electronic expansion valve can be controlled to reduce the opening degree; when the current characteristic temperature is smaller than the new target temperature, the compressor can be controlled to run at a reduced frequency or the electronic expansion valve can be controlled to run at an increased opening.
The current characteristic temperature of the multi-split air conditioner can be determined according to the coil temperature of all the opened indoor units, the corresponding weights can be set for different indoor units, and the current characteristic temperature of the multi-split air conditioner is obtained by carrying out weighted average according to all the coil temperatures and the corresponding weights. The weights corresponding to different indoor units can be determined according to the nominal capacity of the corresponding indoor units. For example, define T 2mean For the current characteristic temperature of the multi-split air conditioner, the nominal capacity of x indoor units which are currently started is n1, n2 and n3 … nx KW respectively, and the coil temperatures of the indoor heat exchangers are T21, T22 and T23 … T2 x ℃, then:
。
further, before step S10, the operation of the multi-split air conditioner according to the initial target temperature may be controlled in a similar manner to the manner mentioned for controlling the operation of the multi-split air conditioner according to the new target temperature, which is not described herein.
According to the control method of the multi-split air conditioner, which is provided by the embodiment of the invention, the temperature difference value between the indoor temperature of each opened indoor unit and the corresponding set temperature is determined, the new target temperature corresponding to the characteristic temperature is determined according to the temperature difference value corresponding to each indoor unit and the current temperature corresponding to the characteristic temperature representing the heat exchange efficiency of the system, the multi-split air conditioner is controlled to operate according to the new target temperature, and the target value corresponding to the characteristic temperature of the multi-split air conditioner operation control in the process is not a fixed and invariable numerical value any more, but can be adjusted according to the actual adjustment requirements of all indoor units, so that the active control of the temperature difference between the indoor heat exchanger and the indoor environment is realized, the irreversible loss in the heat exchange cycle is reduced, and the system energy efficiency is effectively improved; and the method is beneficial to prolonging the start-stop period of the system under low load, thereby reducing frequent start-stop of the system and ensuring indoor comfort.
Further, in this embodiment, step S30 includes controlling the operation of the multi-split air conditioner according to the new target temperature and maintaining a target duration, where the target duration may be a preset fixed duration, or a duration determined according to an actual operation condition of the multi-split air conditioner. After step S30, step S10 may be performed back. In the process of circularly executing the steps S10 to S30, the new target temperature determined last time is the initial target temperature of the next time; the initial target temperature when there is no new target temperature determined last time may be a preset initial temperature. Based on the method, the method can be suitable for realizing gradual adjustment and dynamic adjustment of the output capacity of the system on the target temperature corresponding to the characteristic temperature according to the running condition of the indoor unit in the multi-split air conditioner, so that the indoor comfort is further improved.
Further, in this embodiment, a load variation parameter corresponding to an indoor unit started in the multi-split air conditioner is obtained; and determining a target duration according to the load change parameter.
The target duration is positively correlated with the stability of the load variation parameter characterization.
The load change parameter may reflect a corresponding load change of the indoor unit in a target time period corresponding to the current time. In this embodiment, the ending time of the target period is the current time, and the load change parameter may be determined according to the load indexes of at least two indoor units detected in the target period. The load change parameter may include a load change rate or a load change magnitude or a stability factor corresponding to at least two load indices, and so on.
In this embodiment, at least two load indexes detected by the indoor units started in the multi-split air conditioner at different times within a preset time period corresponding to the current time are obtained; determining a stability factor of the at least two load indices, the load variation parameter comprising the stability factor.
And detecting the load index of the opened indoor unit at intervals in the running process of the multi-split air conditioner, wherein the set duration is smaller than the preset duration. Defining the starting time as the time before the current time and at a preset time interval from the current time, acquiring all load indexes detected from the starting time to the current time, obtaining at least two load indexes, and sequentially arranging the at least two load indexes according to the sequence of the detection time to obtain a load sequence. In other embodiments, the preset duration may also be a duration that the multi-online air conditioner operation before the current time satisfies the preset condition (for example, a preset duration that the number of indoor units turned on changes to the starting time, etc.).
The stability coefficient comprises variance and/or standard deviation and/or variation coefficient, and the load variation parameter can be obtained by calculating the variance and/or standard deviation and/or variation coefficient of the load sequence.
In the implementation, the interval duration of target temperature adjustment corresponding to the condensing temperature is determined according to the load change parameters of the indoor unit, so that the speed of the indoor load change reaching a stable state is improved, different indoor spaces can reach comfortable temperatures quickly, and the indoor comfort is improved effectively.
Further, based on the above embodiment, another embodiment of the control method of the multi-split air conditioner of the present application is provided. In this embodiment, referring to fig. 3, the step S20 includes:
step S21, determining the control temperature difference of all the opened indoor units according to each temperature difference value and the corresponding target weight of the indoor unit;
each opened indoor unit can set a corresponding target weight. The target weight corresponding to the indoor unit can be a preset fixed value, can be determined according to the actual running condition of the multi-split air conditioner, can be set according to the requirements of users, and the like. In this embodiment, the sum of the target weights of all the opened indoor units is a preset value (e.g. 1, etc.), that is, the target weights corresponding to each opened indoor unit may be different if the opened indoor units are different.
The control temperature difference characterizes the load of all the opened indoor units.
In this embodiment, weighted average calculation is performed on all the temperature difference values and the corresponding target weights, a weighted average result is obtained, and the control temperature difference is determined according to the weighted average result. Specifically, the weighted average result can be used as the control temperature difference, the control temperature difference can be obtained after the weighted average result is corrected according to the correction value, and the correction value can be a preset fixed value or a value determined according to the actual running condition of the multi-split air conditioner.
For example, the temperature values of n indoor units currently turned on are obtained and then respectively marked as E 1 ,…,E i …,E n Controlling the temperature difference Wherein a is i Representing the error weight (i.e., the target weight described above) of each on-going internal machine, a 1 +…+a i +…+a n ＝1，a i The numerical value of the (C) is positively correlated with the control weight of the corresponding indoor unit, and the error weight can be flexibly formulated and allocated according to the requirements of users on different rooms or different use scenes.
Step S22, determining a first temperature adjustment value according to the control temperature difference;
the first temperature adjustment value may be a positive value or an amplitude value. In this embodiment, the first temperature adjustment value is a temperature adjustment amplitude of the initial target temperature; in other embodiments, the first temperature adjustment value may also be a temperature adjustment ratio of the initial target temperature, and so on.
The different control temperature differences correspond to different first temperature adjustment values. Specifically, a correspondence between the control temperature difference and the first temperature adjustment value may be established in advance, where the correspondence may include a calculation formula, a mapping table, and the like, and the first temperature adjustment value corresponding to the control temperature difference may be determined based on the correspondence.
In an implementation manner, different preset temperature adjustment values can be correspondingly set in different temperature difference intervals, a target temperature difference interval in which the control temperature difference is located is determined, and the preset temperature adjustment value corresponding to the target temperature difference interval is taken as the first temperature adjustment value.
In another implementation, the control temperature difference may be substituted into a preset relation between the temperature difference and the temperature adjustment value to calculate the second temperature adjustment value. The preset relation may include a preset coefficient, where the preset coefficient may be adapted to a user scenario or a requirement or an actual operation condition of the multi-split air conditioner, for example, the preset number of times may be determined according to an opening number of the indoor units and/or a coil temperature of the outdoor heat exchanger and/or an operation frequency of the compressor. For example, when the control temperature difference is E and the first temperature adjustment value is Δt, the first temperature adjustment value can be calculated by Δt=b×e, where b is a variable constant (i.e. the above-mentioned preset coefficient), and the change speed of the target T2 is controlled.
Step S23, adjusting the initial target temperature according to the first temperature adjustment value, to obtain the new target temperature.
In one implementation, the first temperature adjustment value is a temperature adjustment magnitude, then the new target temperature = initial target temperature-first temperature adjustment value.
In another implementation, the first temperature adjustment value is a temperature adjustment ratio, and then the new target temperature=the initial target temperature is the first temperature adjustment value.
Wherein the initial target temperature may be increased or decreased according to the first temperature adjustment value.
In this embodiment, the control temperature difference obtained by weighting the temperature differences between the indoor temperatures corresponding to all the opened indoor units and the set temperature is adjusted to obtain the new target temperature corresponding to the new characteristic temperature based on the temperature adjustment value determined by the control temperature difference, and the control temperature difference can accurately reflect the overall load demand condition of the indoor units, so that the output capacity of the multi-split air conditioner can be accurately matched with the overall actual load demand of the indoor units, and further improvement of the energy efficiency and the indoor comfort of the multi-split air conditioner is realized.
Further, in this embodiment, before the step of determining the control temperature differences of all the opened indoor units according to each temperature difference value and the target weight of the corresponding indoor unit, the method further includes: acquiring the operation time length of each indoor unit; and determining the target weight corresponding to each indoor unit according to all the operation time lengths.
The running time length can be the interval time length from the starting time to the current time of the corresponding indoor unit, and is inversely related to the corresponding target weight, namely, the longer the running time length is, the smaller the corresponding target weight is, the running time length can effectively reflect the deviation probability of the indoor space corresponding to the indoor unit and the comfort requirement, and the longer the running time length is, the smaller the deviation probability is, so that the overall comfort of all the indoor spaces with the heat exchange requirements is guaranteed. Or, the total running time of the multi-split air conditioner in the target time period before the current moment in the current opening and stopping process in the heat exchange mode (refrigeration mode or heating mode) corresponding to the current opening of the indoor units is obtained, the running time is positively correlated with the corresponding target weight, namely, the longer the running time is, the larger the corresponding target weight is, the running time can effectively reflect the heat exchange requirement of different indoor space users for using the indoor units, and based on the running time, the allocation priority of the heat exchange quantity of different indoor spaces can be guaranteed to be accurately matched with the requirement of the users.
In this embodiment, the sum of all the operation durations is determined, and the target weight is determined according to the ratio of the operation duration corresponding to the indoor unit to the sum. In other embodiments, the maximum duration of all the operation durations may be determined, and the target weight may be determined according to a ratio of the operation duration corresponding to the indoor unit to the maximum duration.
In this embodiment, the operation duration may accurately reflect actual demands of different indoor spaces, so that the target weight corresponding to each indoor unit is determined based on the operation durations of all the indoor units, which is favorable to ensuring that the output capability of the multi-online air conditioning system can be accurately matched with the overall demands of all the indoor units, and is favorable to further improving energy efficiency and comfort of indoor users.
Further, based on any one of the above embodiments, another embodiment of the control method of the multi-split air conditioner of the present application is provided. In this embodiment, referring to fig. 4, the step S20 includes:
step S201, determining a reference temperature difference corresponding to a heat exchange mode of the multi-split air conditioner currently running in all the temperature differences;
the reference temperature difference is the temperature difference value used for representing the indoor load characteristics of the current multi-split air conditioner in all temperature difference values. In one implementation manner of this embodiment, the reference temperature difference is a temperature difference value used to represent the maximum indoor load of the current multi-split air conditioner among all temperature difference values. Different heat exchange modes correspond to different reference temperature differences. When the multi-split air conditioner is in a current running refrigeration mode, determining the maximum value of all the temperature differences as the reference temperature difference; and when the multi-split air conditioner currently operates in a heating mode, determining the minimum value in all the temperature differences as the reference temperature difference. Based on this, it can be ensured that the heat exchange requirement of each indoor space can be effectively satisfied after the new target temperature is determined based on the reference temperature difference.
In another implementation of the present embodiment, the reference temperature difference may be a median of all temperature differences, etc.
Step S202, when the reference temperature difference is within a preset temperature difference interval, determining that the initial target temperature is the new target temperature;
the preset temperature difference interval is specifically a preset target interval which can be reached by considering the reference temperature difference for realizing the indoor comfort and the energy conservation of the multi-split air conditioner. In this embodiment, the preset temperature difference interval has a maximum value and a minimum value. In other embodiments, the preset temperature difference interval may also have an interval of one of a maximum value and a minimum value.
Step S203, when the reference temperature difference is outside the preset temperature difference interval, increasing or decreasing the initial target temperature according to the magnitude relation between the reference temperature difference and the preset temperature difference interval, so as to obtain the new target temperature.
The corresponding relation between the magnitude relation corresponding to different heat exchange modes and the adjusting direction of the initial target temperature is different.
The corresponding temperature adjustment parameters when the initial target temperature is increased or decreased according to the size relation can be preset fixed parameters or parameters determined according to the actual running condition of the multi-split air conditioner.
In one implementation manner of this embodiment, the characteristic temperature includes an evaporation temperature, and when the multi-split air conditioner is in a current operation refrigeration mode and the reference temperature difference is smaller than a minimum temperature difference of the preset temperature difference interval, the initial target temperature is increased to obtain the new target temperature; and when the multi-split air conditioner is in a current running refrigeration mode and the reference temperature difference is larger than the maximum temperature difference of the preset temperature difference interval, reducing the initial target temperature to obtain the new target temperature. Defining the minimum value of a preset temperature difference interval as C1, and defining the maximum value of the preset temperature difference interval as C0, wherein when the reference temperature difference is smaller than C1 in the running refrigeration mode of the multi-split air conditioner, the initial target evaporation temperature can be increased to obtain a new target evaporation temperature, so that the energy consumption of the system is effectively reduced; when the reference temperature difference is larger than C0, the initial target evaporation temperature can be reduced to obtain a new target evaporation temperature, so that the refrigerating capacity of the system is effectively improved, and the indoor comfort is improved.
In another implementation manner of this embodiment, the characteristic temperature includes a condensation temperature, and when the multi-split air conditioner is currently operating in a heating mode and the reference temperature difference is smaller than a minimum temperature difference of the preset temperature difference interval, the initial target temperature is reduced to obtain the new target temperature; and when the multi-split air conditioner currently operates a heating mode and the reference temperature difference is larger than the maximum temperature difference of the preset temperature difference interval, increasing the initial target temperature to obtain the new target temperature. Defining the minimum value of a preset temperature difference interval as C1, and defining the maximum value of the preset temperature difference interval as C0, wherein when the reference temperature difference is smaller than C1 in the operation heating mode of the multi-split air conditioner, the initial target condensing temperature can be reduced to obtain a new target condensing temperature, so that the energy consumption of the system is effectively reduced; when the reference temperature difference is larger than C0, the initial target condensing temperature can be increased to obtain a new target condensing temperature, so that the heating capacity of the system is effectively improved, and the indoor comfort is improved.
In the embodiment, by the mode, the indoor comfort and the system energy saving degree of the multi-split air conditioner in the current heat exchange mode are improved.
Further, in this embodiment, the step of increasing or decreasing the initial target temperature according to the magnitude relation between the reference temperature difference and the preset temperature difference interval to obtain the new target temperature includes: determining a second temperature adjustment value according to all the temperature difference values; and increasing or decreasing the initial target temperature according to the magnitude relation and the second temperature adjustment value to obtain the new target temperature.
In one implementation, a preset function between all temperature differences and the second temperature adjustment value is preset, where the preset function may be a statistical function, for example, a min function, a max function, a mean function, or a calculation function including a formula. Based on the preset function, the temperature adjustment value can be obtained through calculation of all the temperature difference values. In other implementations, the control temperature difference or the reference temperature difference or the average value may be determined through all the temperature difference values, and the second temperature adjustment value may be calculated or obtained by looking up a table based on the determined temperature difference parameter, for example, the second temperature adjustment value may be determined in the same manner as the first temperature adjustment value is determined in the steps S21 to S22.
When the corresponding adjustment direction of the size relation is an increase, the initial target temperature can be increased according to the second temperature adjustment value to obtain a new target temperature; when the adjustment direction corresponding to the magnitude relation is reduced, the initial target temperature can be reduced according to the second temperature adjustment value to obtain a new target temperature.
In this embodiment, the second temperature adjustment value is determined based on all the temperature differences corresponding to all the opened indoor units, so that the matching degree of the output capacity and the indoor load after the system is controlled based on the new target temperature is further improved, and thus the energy efficiency and the indoor comfort of the system are both effectively improved.
Further, based on any one of the above embodiments, another embodiment of the control method of the multi-split air conditioner of the present application is provided. In this embodiment, referring to fig. 5, after step S20, the method further includes:
step S301, when the new target temperature is smaller than a preset temperature interval, taking the minimum temperature of the preset temperature interval as the new target temperature, and executing the step of controlling the multi-split air conditioner to operate according to the new target temperature;
the preset temperature interval is specifically a target interval for achieving the target temperature corresponding to the characteristic temperature when the multi-split air conditioner meets the indoor comfort and reliable operation requirements simultaneously.
The preset temperature interval can be a preset fixed interval, can be determined according to the actual running condition of the multi-split air conditioner, and can be determined according to the exhaust temperature and/or the return air temperature of the compressor and/or the change value of the temperature of a coil in the opened indoor unit and/or the air supplementing temperature of the compressor.
Step S302, when the new target temperature is greater than the preset temperature interval, taking the maximum temperature of the preset temperature interval as the new target temperature, and executing the step of controlling the multi-split air conditioner to operate according to the new target temperature;
step S303, when the new target temperature is within the preset temperature interval, executing the step of controlling the multi-split air conditioner to operate according to the new target temperature.
In this embodiment, when the new target temperature deviates from the preset temperature interval, it indicates that the indoor comfort or the system operation reliability is insufficient, and at this time, the critical value of the preset temperature interval is used as the new target temperature to control the operation of the multi-split air conditioner; when the new target temperature is in the preset temperature interval, the indoor comfort and the system operation reliability are both in the preferred state, and the operation of the multi-split air conditioner is controlled according to the current new target temperature, so that the energy efficiency and the indoor comfort are further improved, and the operation reliability is guaranteed.
Further, based on any one of the above embodiments, in this embodiment, after step S10, the number of indoor units currently turned on in the multi-split air conditioner, a deviation value between an operating frequency of the compressor and a limiting frequency, and an outdoor environment temperature are obtained, and a determination manner of determining a new target temperature in a first manner and a second manner is determined according to the number, the deviation value, and the outdoor environment temperature, where the first manner includes steps S21 to S23 described above, and the second manner includes steps S201 to S203 described above.
In this embodiment, the new target temperature is determined by adapting to the number of indoor units to be started, the deviation value between the operating frequency and the limiting frequency of the compressor, and the outdoor environment temperature, which is favorable for ensuring that the new target temperature is used for controlling the multi-split air conditioner to operate, further improving the energy efficiency and the indoor comfort and simultaneously ensuring the operation reliability.
In addition, the embodiment of the invention also provides a storage medium, wherein the storage medium is stored with a control program of the multi-split air conditioner, and the control program of the multi-split air conditioner realizes the relevant steps of any embodiment of the control method of the multi-split air conditioner when being 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 (such as ROM/RAM, magnetic disk, optical disk) as described above, including several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, a multi-split 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 (12)

1. The control method of the multi-split air conditioner is characterized by comprising the following steps of:
acquiring the indoor temperature of each opened indoor unit adjusting space in the multi-split air conditioner and the initial target temperature of the multi-split air conditioner, wherein the initial target temperature is a target value which is required to be reached at present and represents the characteristic temperature of heat energy efficiency of the multi-split air conditioner;
determining a temperature difference value between the indoor temperature and a corresponding set temperature, and determining a new target temperature corresponding to the characteristic temperature according to each temperature difference value and the initial target temperature;
and controlling the multi-split air conditioner to operate according to the new target temperature.
2. The method for controlling a multi-split air conditioner as claimed in claim 1, wherein the step of determining the new target temperature corresponding to the characteristic temperature according to each of the temperature difference values and the initial target temperature comprises:
determining the control temperature difference of all the opened indoor units according to each temperature difference value and the corresponding target weight of the indoor unit;
determining a first temperature adjustment value according to the control temperature difference;
and adjusting the initial target temperature according to the first temperature adjustment value to obtain the new target temperature.
3. The method for controlling a multi-split air conditioner as set forth in claim 2, wherein before the step of determining the control temperature differences of all the opened indoor units according to each temperature difference value and the target weight of the corresponding indoor unit, further includes:
acquiring the operation time length of each indoor unit;
and determining the target weight corresponding to each indoor unit according to all the operation time lengths.
4. The method for controlling a multi-split air conditioner as claimed in claim 1, wherein the step of determining the new target temperature corresponding to the characteristic temperature according to each of the temperature difference values and the initial target temperature comprises:
determining a reference temperature difference corresponding to a heat exchange mode of the multi-split air conditioner currently running in all the temperature differences;
when the reference temperature difference is within a preset temperature difference interval, determining that the initial target temperature is the new target temperature;
and when the reference temperature difference is out of the preset temperature difference interval, increasing or decreasing the initial target temperature according to the magnitude relation between the reference temperature difference and the preset temperature difference interval to obtain the new target temperature.
5. The method for controlling a multi-split air conditioner as claimed in claim 4, wherein the step of determining the reference temperature difference corresponding to the heat exchange mode in which the multi-split air conditioner is currently operated among all the temperature differences comprises:
When the multi-split air conditioner is in a current running refrigeration mode, determining the maximum value of all the temperature differences as the reference temperature difference;
and when the multi-split air conditioner currently operates in a heating mode, determining the minimum value in all the temperature differences as the reference temperature difference.
6. The method for controlling a multi-split air conditioner as claimed in claim 4, wherein the characteristic temperature includes an evaporation temperature, and the step of increasing or decreasing the initial target temperature to obtain the new target temperature according to a magnitude relation between the reference temperature difference and the preset temperature difference interval includes:
when the multi-split air conditioner is in a current running refrigeration mode and the reference temperature difference is smaller than the minimum temperature difference of the preset temperature difference interval, increasing the initial target temperature to obtain the new target temperature;
and when the multi-split air conditioner is in a current running refrigeration mode and the reference temperature difference is larger than the maximum temperature difference of the preset temperature difference interval, reducing the initial target temperature to obtain the new target temperature.
7. The method for controlling a multi-split air conditioner as claimed in claim 4, wherein the characteristic temperature includes a condensing temperature, and the step of increasing or decreasing the initial target temperature to obtain the new target temperature according to a magnitude relation between the reference temperature difference and the preset temperature difference interval includes:
When the multi-split air conditioner currently operates a heating mode and the reference temperature difference is smaller than the minimum temperature difference of the preset temperature difference interval, reducing the initial target temperature to obtain the new target temperature;
and when the multi-split air conditioner currently operates a heating mode and the reference temperature difference is larger than the maximum temperature difference of the preset temperature difference interval, increasing the initial target temperature to obtain the new target temperature.
8. The method for controlling a multi-split air conditioner as claimed in claim 4, wherein the step of increasing or decreasing the initial target temperature according to the magnitude relation between the reference temperature difference and the preset temperature difference interval comprises:
determining a second temperature adjustment value according to all the temperature difference values;
and increasing or decreasing the initial target temperature according to the magnitude relation and the second temperature adjustment value to obtain the new target temperature.
9. The control method of a multi-split air conditioner according to any one of claims 1 to 8, wherein the characteristic temperature is a condensation temperature of the multi-split air conditioner when the multi-split air conditioner is in a heating mode; and when the multi-split air conditioner is in a refrigeration mode, the characteristic temperature is the evaporation temperature of the multi-split air conditioner.
10. The control method of a multi-split air conditioner according to any one of claims 1 to 8, wherein after the step of determining a temperature difference value between the indoor temperature and the corresponding set temperature, determining a new target temperature corresponding to the characteristic temperature according to each of the temperature difference values and the initial target temperature, further comprises:
when the new target temperature is smaller than a preset temperature interval, taking the minimum temperature of the preset temperature interval as the new target temperature, and executing the step of controlling the multi-split air conditioner to operate according to the new target temperature;
when the new target temperature is greater than the preset temperature interval, taking the maximum temperature of the preset temperature interval as the new target temperature, and executing the step of controlling the multi-split air conditioner to operate according to the new target temperature;
and when the new target temperature is within the preset temperature interval, executing the step of controlling the multi-split air conditioner to operate according to the new target temperature.
11. The utility model provides a many online air conditioner which characterized in that, many online air conditioner includes: the method for controlling the multi-split air conditioner comprises a memory, a processor and a control program of the multi-split air conditioner, wherein the control program is stored in the memory and can run on the processor, and the control program of the multi-split air conditioner realizes the steps of the control method for the multi-split air conditioner according to any one of claims 1 to 10 when being executed by the processor.
12. A storage medium, wherein a control program of a multi-split air conditioner is stored on the storage medium, and when the control program of the multi-split air conditioner is executed by a processor, the steps of the control method of the multi-split air conditioner according to any one of claims 1 to 10 are implemented.
CN202310797625.4A 2023-06-30 2023-06-30 Control method of multi-split air conditioner, multi-split air conditioner and storage medium Pending CN116857779A (en)

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Application Number Priority Date Filing Date Title
CN202310797625.4A CN116857779A (en) 2023-06-30 2023-06-30 Control method of multi-split air conditioner, multi-split air conditioner and storage medium

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CN116857779A true CN116857779A (en) 2023-10-10

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