Control method, controller, air conditioning system and medium of multi-split air conditioning system

Abstract

The present invention discloses a control method, a controller, an air-conditioning system and a medium for a multi-split air-conditioning system. In the multi-split air-conditioning system, at least a part of indoor units with refrigeration demand turn on the wind-sensing mode. The control method comprises: obtaining the total capacity demand of the outdoor unit according to the actual capacity demand of each indoor unit with refrigeration demand, and determining the initial frequency of the compressor according to the total capacity demand; adjusting the frequency of the compressor based on the initial frequency according to the operation mode of all indoor units with refrigeration demand and the target evaporation temperature of the indoor unit; adjusting the frequency of the compressor in the above manner takes into account the evaporator coil temperature of the indoor unit, and setting the reference evaporation temperature or the evaporation temperature threshold according to whether all the indoor units are operating in the wind-sensing mode, so that the outdoor unit can meet the different mode requirements of the indoor unit and reduce the condensation probability in the wind-sensing mode.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a control method, a controller, an air conditioning system and a medium for a multi-split air conditioning system. Background Art

[0002] A multi-split air-conditioning system includes one outdoor unit and multiple indoor units. When only a few indoor units are turned on for cooling, for example, only one or two indoor units are turned on for cooling, the multi-split air-conditioning system is equivalent to a large condenser with a small evaporator. The air outlet temperature of the evaporator of the indoor unit is low, and there is a risk of condensation, which affects the user experience.

[0003] During actual operation, different indoor units may be in different operating modes. For example, some indoor units are equipped with functions such as no wind, soft wind, and anti-direct blowing, which can prevent the cold wind blown out by the indoor unit from directly affecting the comfort of the human body. However, when the comfortable wind function is turned on, it is necessary to prevent condensation from accumulating at the air outlet and dripping, which may damage user facilities. In particular, when one indoor unit turns on the conventional cooling function and the other turns on the no wind cooling function, the air outlet temperatures of the two indoor units are different, the cooling capacity requirements are different, and the anti-condensation requirements are also different. Therefore, how the outdoor unit cooperates with the indoor unit to ensure the reliability of the multi-split air-conditioning system and the user experience is an urgent problem to be solved. Summary of the invention

[0004] The embodiments of the present invention provide a control method, a controller, an air conditioning system and a medium for a multi-split air conditioning system, which can control the operation of the multi-split air conditioning system according to the operating conditions of an outdoor unit and each indoor unit, thereby ensuring the reliability of the operation of the multi-split air conditioning system and user experience.

[0005] An embodiment of a first aspect of the present invention provides a control method for a multi-split air-conditioning system, wherein at least a portion of indoor units with cooling requirements in the multi-split air-conditioning system are turned on in a wind sensing mode; the control method comprises:

[0006] Determine the actual capacity requirement and target evaporating temperature for each indoor unit with cooling demand;

[0007] Summarizing the actual capacity requirements to obtain a total capacity requirement of the outdoor unit, and determining an initial frequency of the compressor according to the total capacity requirement;

[0008] When all the indoor units with cooling demand are operated in the wind sensing mode, the target evaporation temperature corresponding to the indoor unit with the lowest dew point temperature is used as the reference evaporation temperature, and the frequency of the compressor is adjusted based on the initial frequency according to the temperature characteristic values ​​of the evaporator coils of all the indoor units and the reference evaporation temperature;

[0009] When the indoor units with cooling demand are only partially operated in the wind sensing mode, the frequency of the compressor is adjusted on the basis of the initial frequency according to the temperature characteristic values ​​of the evaporator coils of all the indoor units and a preset evaporation temperature threshold.

[0010] According to the control method of a multi-split air-conditioning system of the first aspect of the embodiment of the present invention, there are at least the following beneficial effects: in the multi-split air-conditioning system, if at least part of the multiple indoor units turn on the wind-sensing mode, then the actual capacity requirements and target evaporating temperatures of all the indoor units with cooling demand at this time are calculated, so as to determine the total capacity requirement corresponding to the outdoor unit and the initial frequency of the compressor corresponding to the total capacity requirement; during the operation of these indoor units, based on the initial frequency of the compressor at this time, the frequency of the compressor is adjusted in different ways according to whether all of these indoor units are operating in the wind-sensing mode, so that the outdoor unit can meet the cooling demand of the indoor unit under different mode combination operation conditions, thereby improving the user experience of the multi-split air-conditioning system; at the same time, by adjusting the frequency of the compressor in the above way, the temperature characteristic value of the evaporator coil of the indoor unit is taken into account, and the reference evaporating temperature or the evaporating temperature threshold is set according to whether all the indoor units are operating in the wind-sensing mode, so that the outdoor unit can meet the different mode requirements of the indoor unit and reduce the condensation probability in the wind-sensing mode.

[0011] In some embodiments, the actual capacity requirement is determined based on the cooling demand capacity value, rated cooling capacity, fan gear and operating mode of the indoor unit. The cooling demand capacity value is determined based on the indoor temperature and set temperature corresponding to the indoor unit. The operating mode includes the wind sensing mode and the conventional cooling mode.

[0012] In some embodiments, the target evaporation temperature is determined based on the dew point temperature of the indoor unit, the heat transfer temperature difference correction parameter and the mode correction parameter corresponding to the wind sensing mode, and the dew point temperature is determined based on the indoor humidity and indoor temperature corresponding to the indoor unit.

[0013] In some embodiments, determining the initial frequency of the compressor according to the total capacity requirement includes:

[0014] Rounding the total capacity requirement, and using the rounded result as the frequency gear of the compressor;

[0015] The frequency value corresponding to the frequency gear is used as the initial frequency of the compressor.

[0016] In some embodiments, the step of using the frequency value corresponding to the frequency gear as the initial frequency of the compressor includes:

[0017] Dividing the frequency range from the maximum frequency value to the minimum frequency value of the compressor into a plurality of frequency gears according to a preset frequency interval;

[0018] The initial frequency of the compressor is calculated according to the rounding result, the preset frequency interval and the minimum frequency value.

[0019] In some embodiments, the wind sense mode includes a no wind sense mode, a soft wind sense mode, and an anti-direct blowing mode; the control method further includes:

[0020] In the case of summarizing the actual capacity requirements, receiving a mode flag sent by the indoor unit, wherein the mode flag indicates that the indoor unit turns on one of the no wind mode, the soft wind mode, or the anti-direct blowing mode;

[0021] After summarizing the total capacity requirements of the outdoor unit, the executable mode flag is returned to the indoor unit corresponding to the mode flag according to the mode flag and the operating status of the compressor. The executable mode flag is used to instruct the indoor unit to execute one of the no wind mode, the soft wind mode or the anti-direct blowing mode.

[0022] In some embodiments, after the total capacity requirements of the outdoor units are obtained through aggregation, the control method further includes:

[0023] Recording the continuous operation time of the compressor;

[0024] When the continuous operation time is less than or equal to the preset time, or at least part of the indoor units with cooling demand are operating in the conventional cooling mode, it is determined that only part of the indoor units are operating in the wind sensing mode;

[0025] When the continuous operation time is greater than the preset time and all the indoor units with cooling demand have the mode flag, it is determined that all the indoor units are operating in the wind sensing mode.

[0026] In some embodiments, adjusting the frequency of the compressor based on the initial frequency according to the temperature characteristic values ​​of the evaporator coils of all the indoor units and the reference evaporation temperature comprises:

[0027] Determining an average temperature characteristic value according to the temperature characteristic values ​​of the evaporator coils of all the indoor units;

[0028] determining a first evaporation temperature and a second evaporation temperature according to the reference evaporation temperature and the correction temperature, wherein the first evaporation temperature is less than the second evaporation temperature;

[0029] When the average temperature characteristic value is greater than the second evaporation temperature, increasing the frequency of the compressor based on the initial frequency;

[0030] When the average temperature characteristic value is less than the first evaporation temperature, reducing the frequency of the compressor based on the initial frequency;

[0031] When the average temperature characteristic value is between the first evaporation temperature and the second evaporation temperature, the frequency of the compressor is kept unchanged.

[0032] In some embodiments, the evaporation temperature threshold includes a first temperature threshold and a second temperature threshold, and the first temperature threshold is less than the second temperature threshold; and adjusting the frequency of the compressor based on the initial frequency according to the temperature characteristic values ​​of the evaporator coils of all the indoor units and the preset evaporation temperature threshold includes:

[0033] Determining an average temperature characteristic value according to the temperature characteristic values ​​of the evaporator coils of all the indoor units;

[0034] When the average temperature characteristic value is greater than the second temperature threshold, increasing the frequency of the compressor based on the initial frequency;

[0035] When the average temperature characteristic value is less than the first temperature threshold, reducing the frequency of the compressor based on the initial frequency;

[0036] When the average temperature characteristic value is between the first temperature threshold and the second temperature threshold, the frequency of the compressor is kept unchanged.

[0037] In some embodiments, the frequency adjustment of the compressor is performed in frequency gears, with one or more frequency gears being increased or decreased each time, and the frequency gears are obtained by dividing the frequency interval from the maximum frequency value to the minimum frequency value of the compressor into multiple frequency gears according to preset frequency intervals.

[0038] A second aspect of the present invention provides a controller, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the control method as described in the first aspect when executing the computer program.

[0039] A third aspect of the present invention provides a multi-split air conditioning system, comprising the controller of the second aspect.

[0040] A fourth aspect of the present invention provides a computer-readable storage medium storing computer-executable instructions for executing the control method as described in the first aspect.

[0041] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural diagram of a multi-pipe multi-split air conditioning system provided by an embodiment of the present invention;

[0043] Figure 2 is an overall flow chart of the control method provided by an embodiment of the present invention;

[0044] Figure 3 is a flow chart of calculating the initial frequency of a compressor provided by an embodiment of the present invention;

[0045] Figure 4 is a flow chart for calculating and determining the initial frequency by dividing the compressor frequency value according to the gear provided by an embodiment of the present invention;

[0046] Figure 5 is a flow chart of interaction through a mode flag and an executable mode flag provided by an embodiment of the present invention;

[0047] Figure 6 is a flow chart of determining a combined working mode of an indoor unit according to different continuous operation durations provided by an embodiment of the present invention;

[0048] Figure 7 is a frequency control flow chart of the compressor in the full wind sensing mode of the indoor unit provided by an embodiment of the present invention;

[0049] Figure 8 is a frequency control flow chart of the compressor in the non-full wind sensing mode of the indoor unit provided by an embodiment of the present invention;

[0050] Fig. 9 It is a structural connection diagram of a controller provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the characteristics, operations or features described in the specification can be combined in any appropriate manner to form various implementation methods. At the same time, the steps or actions in the method description can also be replaced or adjusted in order in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the accompanying drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary sequence, unless otherwise specified that a certain sequence must be followed.

[0052] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0053] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0054] As users have higher and higher requirements for the quality of life, air conditioning products now have higher requirements for comfort. One-to-one air conditioners such as wall-mounted air conditioners and cabinet air conditioners have proposed functions with better comfort, such as no wind feeling (including no wind feeling, soft wind feeling, and anti-direct blowing, etc.). For multi-pipe multi-split air conditioners with one-to-one universal indoor units, there is also a need to better improve the user experience. However, the multi-pipe multi-split air conditioning system is different from the one-to-one air conditioning system. It has multiple indoor units and one outdoor unit. The indoor unit is connected to the outdoor unit through a separate piping. Changes in the operating status of the outdoor unit will affect the operating status of the outdoor unit, and then affect the operating status of all running indoor units.

[0055] Compared with wall-mounted air conditioners, cabinet air conditioners and other one-to-one air conditioners, the windless feeling control of the multi-pipe multi-split air-conditioning system is more prone to condensation risks and the risk of low air outlet temperature. In this case, it is necessary to control the windless feeling of the multi-split system from the perspective of the entire air-conditioning system.

[0056] The above problems are due to the characteristics of multi-pipe multi-split air conditioning system:

[0057] First, the outdoor unit of the multi-split air conditioning system is matched with multiple indoor units. When a small number of indoor units are turned on, such as single or double opening, the minimum load of the outdoor unit is still too large for the indoor unit. Especially when there is no wind, the speed of the indoor unit fan is too low, the load is further reduced, and the air outlet temperature is low.

[0058] Second, the operation of the outdoor unit will affect the operating status of all indoor units, so when the operating status of the outdoor unit changes, the indoor unit needs to self-regulate to reduce this impact. For example, when one indoor unit is cooling and one indoor unit is running without wind, the frequency of the outdoor unit will change to ensure the cooling effect. If the indoor unit does not distribute the flow, the air outlet temperature of the indoor unit without wind will be significantly lower than that of the cooling indoor unit. When all indoor units are running without wind, the operating status of all indoor units must be taken into consideration, and reliability must be prioritized.

[0059] Third, the indoor unit has different requirements for cooling output when running in different windless modes (anti-direct blowing, soft wind, and no wind). Their requirements for cooling output decrease in sequence. In addition, the difference in the angle of the wind shield on the indoor unit also has different requirements for anti-condensation, so there are differences in the control of the air outlet temperature.

[0060] At present, the control of multi-pipe multi-split air-conditioning system when applying the windless function does not take into account the coordination between the indoor unit and the outdoor unit, and cannot take into account the cooling output requirements of different windless modes. It is easy to have problems such as low air outlet temperature or condensation, which affects the user experience.

[0061] Based on this, an embodiment of the present invention provides a control method, controller, air-conditioning system and medium for a multi-split air-conditioning system. According to the actual capacity requirements and target evaporating temperature of each indoor unit and the current operating mode of each indoor unit, the total capacity requirements of the outdoor unit are determined, and then the initial frequency and frequency adjustment method of the compressor are determined, thereby improving the coordination between the outdoor unit and the indoor unit, thereby improving the user experience.

[0062] The following is a description with reference to the accompanying drawings:

[0063] Reference Figure 1 and Figure 2 The embodiment of the present invention provides a control method for a multi-split air conditioning system, in which at least a portion of indoor units with cooling requirements in the multi-split air conditioning system are turned on in a wind sensing mode; the control method comprises:

[0064] Step S100, determining the actual capacity requirement and target evaporation temperature of each indoor unit with cooling demand;

[0065] Step S200, obtaining a total capacity requirement of the outdoor unit according to the actual capacity requirement, and determining an initial frequency of the compressor according to the total capacity requirement;

[0066] Step S300, when all indoor units with cooling demand are running in the wind sensing mode, the target evaporation temperature corresponding to the indoor unit with the lowest dew point temperature is used as the reference evaporation temperature, and the frequency of the compressor is adjusted on the basis of the initial frequency according to the temperature characteristic values ​​of the evaporator coils of all indoor units and the reference evaporation temperature;

[0067] Step S400: When only part of the indoor units with cooling demand are operated in the wind sensing mode, the frequency of the compressor is adjusted based on the initial frequency according to the temperature characteristic values ​​of the evaporator coils of all the indoor units and a preset evaporation temperature threshold.

[0068] First of all, it should be noted that the multi-split air conditioning system mentioned in this application refers to a multi-pipe multi-split system. Each indoor unit is connected to the outdoor unit through its own piping (refrigerant pipeline). The outdoor unit converges the refrigerant and inputs it to the air inlet of the compressor. The exhaust port of the compressor is then diverted to each indoor unit at the outdoor unit. For the convenience of expression, the multi-split air conditioning system is used to refer to the multi-pipe multi-split air conditioning system. Figure 1 As shown in the schematic diagram of the connection structure of the multi-split air conditioning system, the air outlet of the compressor is connected to the condenser of the outdoor unit through a four-way valve, and the condenser outlet is diverted to multiple indoor units through the refrigerant pipeline ( Figure 1 Take four indoor units as an example, namely indoor unit A, indoor unit B, indoor unit C and indoor unit D), an independent refrigerant pipeline is arranged between the evaporator inlet of each indoor unit and the condenser outlet of the outdoor unit, and a throttling element is arranged on each independent refrigerant pipeline. The evaporator outlet of each indoor unit also leads to an independent refrigerant pipeline. After these refrigerant pipelines converge, the refrigerant enters the gas-liquid separator through a four-way valve and finally returns to the air inlet of the compressor. In addition, the wind sense mode mentioned in this application is an operating mode in which the indoor unit reduces the amount of direct air blowing to the user, including but not limited to the common no wind sense, soft wind sense and anti-direct blowing functions of current air conditioners. Therefore, the wind sense mode is a general term for the above-mentioned functional modes, and it is also considered to distinguish the difference in cooling output requirements of the no wind sense, soft wind sense and anti-direct blowing functions in the following text.

[0069] In a multi-split air conditioning system, multiple indoor units are matched with one outdoor unit. When multiple indoor units are working, different indoor units may operate in different modes, for example, one indoor unit operates in a windless mode, one indoor unit operates in an anti-direct blowing mode, and one indoor unit operates in a conventional cooling mode. In order to take into account the cooling capacity requirements of the indoor units in each mode, the outdoor unit needs to control the compressor to operate within a suitable frequency range to obtain a better user experience. The embodiment of the present invention determines the actual capacity requirements of each indoor unit with cooling requirements, and then determines the total capacity requirements of the outdoor unit, and determines the initial frequency of the compressor according to the total capacity requirements of the outdoor unit. The compressor operates at the initial frequency, and determines how to adjust the initial frequency according to the current operating mode of each indoor unit to achieve the coordinated operation of the outdoor unit and the indoor unit. Specifically, when all indoor units are running in the wind-sensing mode, the target evaporation temperature corresponding to the indoor unit with the lowest dew point temperature is used as the reference evaporation temperature, and the relationship between the temperature characteristic values ​​of the evaporator coils of all indoor units and the reference evaporation temperature is considered, and the frequency of the compressor is adjusted on the basis of the initial frequency; when not all indoor units are running in the wind-sensing mode, the preset evaporation temperature threshold is used as a reference, and the relationship between the temperature characteristic values ​​of the evaporator coils of all indoor units and the evaporation temperature threshold is considered, and the frequency of the compressor is adjusted on the basis of the initial frequency. Generally speaking, after all indoor units of the multi-split air-conditioning system enter the wind-sensing mode, the outlet air temperature drops, and the frequency of the compressor needs to be adjusted to increase the evaporation temperature so that the superheat at the evaporator of the indoor unit is increased, thereby increasing the outlet air temperature of the indoor unit, and preventing the occurrence of indoor condensation under the premise of meeting the wind-sensing mode. If there are still some indoor units in the multi-split air-conditioning system that are in the conventional cooling mode, the operation of the indoor units with conventional cooling needs should be guaranteed first, and condensation should be avoided as much as possible in the rooms of the indoor units in the wind-sensing mode. In short, according to the operation modes of different indoor units, the compressor is adjusted to achieve the coordination of the outdoor unit and the indoor unit. The specific control method of the compressor frequency will be described later.

[0070] The actual capacity requirement of the indoor unit is determined as follows:

[0071] The actual capacity requirement is determined according to the cooling demand capacity value, rated cooling capacity, fan gear and operating mode of the indoor unit. The cooling demand capacity value is determined according to the indoor temperature and set temperature corresponding to the indoor unit. The operating mode includes a wind sensing mode and a conventional cooling mode. In one embodiment, the actual capacity requirement can be expressed as follows:

[0072] Cn=A*HP*K_fan*K_nofan

[0073] Cn represents the actual capacity requirement of the nth indoor unit in the multi-split air-conditioning system, A represents the cooling demand capacity value of the indoor unit, PH represents the rated cooling capacity of the indoor unit, K_fan represents the fan gear of the indoor unit, and K_nofan represents the operating mode of the indoor unit; wherein, the values ​​of A, HP, K_fan, and K_nofan can be determined by referring to the following Tables 1 to 4:

[0074] Table 1: Table of cooling demand capacity values ​​for indoor units

[0075] Range(℃) A value (recommended value) A value (optional range) T1-Ts≥1 3 2.5～4.5 0≤T1-Ts<1 2 1.5～3 -1≤T1-Ts<0 1 0.5～2 T1-Ts<-1 0 0

[0076] Wherein, T1 represents the indoor temperature detected by the indoor unit, and Ts represents the set temperature of the indoor unit.

[0077] Table 2: Rated cooling capacity value table

[0078] Model (rated cooling capacity) HP value (recommended value) HP value (optional range) 2000 0.8 0.5～1.1 2600 1.0 0.8～1.25 3200 / 3500 1.2 0.9～1.35 4800 / 5300 1.5 1.2～1.8 7000 2.5 1.8～2.8 10500 3.1 2.5～3.8

[0079] Table 3: Fan gear value table

[0080]

[0081]

[0082] Table 4: Operation mode value table

[0083] Operation Mode K_nofan value (recommended value) K_nofan value (optional range) No wind feeling 0.2 0.05～0.3 Soft breeze 0.4 0.2～0.5 Direct Blow Protection 0.6 0.3～0.8 Refrigeration 1 Refrigeration not corrected

[0084] It can be seen from Tables 1 to 4 above that the cooling demand capacity value, rated cooling capacity, fan gear and operating mode are all converted into corresponding values ​​to calculate the actual capacity demand, that is, the A value is determined according to the difference between the indoor temperature and the set temperature of the indoor unit, and is divided into four gears, with values ​​of 0, 1, 2, and 3 respectively; the PH value is determined according to the rated cooling capacity of the indoor unit. For indoor units of the same manufacturer, different models represent different rated cooling capacities, with values ​​of 0.8, 1.0, 1.2, 1.5, 2.5, and 3.1 respectively; K_fan is divided into 5 intervals according to the speed percentage, with values ​​of 0.2, 0.4, 0.6, 1.0, and 1.2 from small to large; K_nofan is determined according to the actual operating mode. The actual wind speed increases in the four modes of no wind feeling, soft wind feeling, anti-direct blowing and conventional cooling, with values ​​of 0.2, 0.4, 0.6, and 1.0 respectively. At the same time, it can be seen from Tables 1 to 4 that in addition to the recommended values, the optional ranges of the values ​​of each value are also given. Those skilled in the art can freely select the actual value according to the optional range, and are not limited to the recommended value.

[0085] The target evaporation temperature of the indoor unit is determined as follows:

[0086] The target evaporation temperature is determined according to the dew point temperature of the indoor unit, the heat transfer temperature difference correction parameter and the mode correction parameter corresponding to the wind sensing mode. The dew point temperature is determined according to the indoor humidity and indoor temperature corresponding to the indoor unit. In one embodiment, the target evaporation temperature can be expressed as follows:

[0087] T2_trg=Td-△T+Ca+Cb

[0088] T2_trg represents the target evaporation temperature of the indoor unit, Td represents the dew point temperature, Ca represents the correction coefficient corresponding to the soft wind mode, and Cb represents the correction coefficient corresponding to the anti-direct blowing mode. The dew point temperature is determined according to the following formula:

[0089]

[0090] c8=-5800.2206

[0091] c9=1.3914993

[0092] c10=-0.04860239

[0093] c11=0.41764768*10 -4

[0094] c12=-0.14452093*10 -7

[0095] c13=6.5459673

[0096] Where H1 is the indoor humidity detected by the indoor unit, and the range is limited to [20%, 90%], T = T1 + 273.15, where the range of T1 is limited to [16, 30] °C, △T is the correction coefficient, which can be considered as the heat transfer temperature difference, the recommended value is 4 °C, the range can be [2, 10] °C, and the final calculated Td value is limited to [6, 22] °C. The values ​​of Ca and Cb can be determined by referring to Table 5 and Table 6 below:

[0097] Table 5. Correction parameter value table of soft wind mode

[0098] Humidity range Ca value (recommended value) Ca value (optional range) ＜70％ 0 / 70％～80％ -1 -5～-1 80％～100％ -0.5 0.3～1.2

[0099] Table 6. Correction parameter value table of direct blow prevention mode

[0100] Humidity range Cb value (recommended value) Cb value (optional range) ＜70％ 0 / 70％～80％ -2 -5～-1 80％～100％ -1 0.5～2

[0101] It is worth noting that the mode in which the indoor unit operates can be determined by the mode flag. When the soft wind mode flag of the indoor unit exists and the humidity is greater than 70%, the value of Table 5 is applied. When the soft wind mode flag of the indoor unit does not exist or the humidity is less than 70%, the value of Ca is directly set to zero. When the anti-direct blowing mode flag of the indoor unit exists and the humidity is greater than 70%, the value of Table 6 is applied. When the anti-direct blowing mode flag of the indoor unit does not exist or the humidity is less than 70%, Cb is directly set to zero. It can be understood that for any indoor unit, only one mode flag can exist at the same time, so at least one of the values ​​of Ca and Cb is set to zero.

[0102] The actual capacity requirements Cn of each indoor unit are obtained through the above calculations, and then the total capacity requirements of the outdoor unit are obtained based on the actual capacity requirements. The total capacity requirements can be obtained by referring to the following formula:

[0103] Qn=K_out*∑Cn

[0104] Where Qn represents the total capacity requirement of the outdoor unit, and K_out is the preset outdoor unit coefficient value.

[0105] Reference Figure 3 In the above step S200, determining the initial frequency of the compressor according to the total capacity requirement includes the following steps:

[0106] Step S210, rounding the total capacity demand, and using the rounded result as the frequency gear of the compressor;

[0107] Step S220: taking the frequency value corresponding to the frequency gear as the initial frequency of the compressor.

[0108] For example, if the calculation result of the total capacity demand Qn is 8.2, if it is set to round up, the rounding result is 9, and the frequency gear of the compressor is determined to be F9. If it is set to round down, the rounding result is 8, and the frequency gear of the compressor is determined to be F8. Then, the initial frequency of the compressor is determined according to the frequency gear of the compressor. It can be understood that the embodiment of the present invention pre-sets the corresponding relationship between the frequency of the compressor and the frequency gear, so that the corresponding initial frequency can be directly found after the rounding result is obtained.

[0109] Specifically, in some embodiments, referring to Figure 4 , the division of frequency gears can be obtained by the following steps:

[0110] Step S221, dividing the frequency interval from the maximum frequency value to the minimum frequency value of the compressor into a plurality of frequency gears according to a preset frequency interval;

[0111] Step S222, calculating the initial frequency of the compressor according to the rounding result, the preset frequency interval and the minimum frequency value.

[0112] The maximum frequency value and the minimum frequency value of the compressor are Fmax and Fmin respectively. In the frequency range between Fmax and Fmin, the frequency is divided according to the preset frequency interval △F, so the total number of sequences obtained by division is N=(Fmax-Fmin) / △F, N is a positive integer, and the value of △F can be 2~5Hz.

[0113] Assume that the rounded result is represented by n, then the frequency gear is n, and the corresponding initial frequency Fn = Fmin + (n-1) * △F. In actual work, due to stress or other reasons, the actual initial frequency of the compressor can be adjusted near the Fn value. It is worth noting that since the value of the total capacity demand Qn is not directly related to the size of the total number of sequences N, in order to avoid the situation where Qn exceeds the total number of sequences N after rounding, the size of K_out can be set to limit the value of Qn, which will not be elaborated here.

[0114] As mentioned above, the indoor unit has a mode flag in the wind sensing mode, which is used to send to the outdoor unit so that the outdoor unit can determine whether the corresponding indoor unit has turned on the wind sensing mode. This is helpful for the combination of indoor units without wind sensing mode and indoor units with wind sensing mode. Specifically, the wind sensing mode includes no wind sensing mode, soft wind sensing mode and anti-direct blowing mode; refer to Figure 5 , the control method of the embodiment of the present invention further includes:

[0115] Step S201, in the case of summarizing the actual capacity requirements, receiving a mode flag sent by the indoor unit, the mode flag indicating that the indoor unit is turned on one of the no wind mode, the soft wind mode or the anti-direct blowing mode;

[0116] Step S202, after summarizing the total capacity requirements of the outdoor unit, return the executable mode flag to the indoor unit corresponding to the mode flag according to the mode flag and the operating status of the compressor. The executable mode flag is used to instruct the indoor unit to execute one of the no wind mode, soft wind mode or anti-direct blowing mode.

[0117] After the indoor unit receives the wind-sensing mode command set by the user, it does not necessarily enter the wind-sensing mode immediately. For example, when the indoor unit has just been turned on and the temperature in the room has not yet dropped, although the indoor unit has turned on the wind-sensing mode, it still needs to quickly cool down the room temperature first, and then reduce the indoor unit wind speed to enter the wind-sensing mode, adjust the temperature and humidity, and take anti-condensation measures. Therefore, in actual work, when the indoor unit sends the actual capacity demand to the outdoor unit, it carries the mode flag bit. The outdoor unit determines the mode flag bit of each indoor unit while summarizing. At this time, the indoor unit needs to cooperate with the adjustment of the outdoor unit. Even if the room environment where the indoor unit is located allows the indoor unit to operate in the no-wind mode, soft wind mode or anti-direct blowing mode, the indoor unit does not immediately enter the corresponding operation mode; after the outdoor unit summarizes the total capacity demand, it determines the initial frequency of the compressor and coordinates the operation mode that the global indoor unit is to enter, so as to determine whether each indoor unit can execute the operation mode corresponding to the corresponding mode flag bit. The outdoor unit returns the executable mode flag bit to the corresponding indoor unit, indicating that the indoor unit can enter the operation mode corresponding to the mode flag bit. Specifically, when an indoor unit sends an anti-direct blowing mode flag to the outdoor unit, the outdoor unit aggregates the mode flags of all indoor units with cooling demand, determines the initial frequency of the compressor and determines that the indoor unit can perform the anti-direct blowing function, and then returns the executable anti-direct blowing mode flag to the indoor unit. The indoor unit receives the executable anti-direct blowing mode flag and executes the anti-direct blowing mode.

[0118] It is worth noting that, as mentioned above, the indoor unit and the outdoor unit are not directly installed in conjunction with each other. Due to the functional differences between indoor units of different iterations, some indoor units may have newer functions, while others may only have the original conventional cooling function. The outdoor unit may also not have the function of adjusting the wind sensing mode. At this time, the outdoor unit cannot feedback the executable mode flag to the indoor unit. Even if the indoor unit has the function of the wind sensing mode, it cannot perform related operations of the wind sensing mode, thereby avoiding safety and reliability risks.

[0119] In order to determine the combination of operating modes of each indoor unit, after summarizing the total capacity requirements of the outdoor unit, refer to Figure 6 , the control method of the embodiment of the present invention further includes:

[0120] Step S301, recording the continuous operation time of the compressor;

[0121] Step S302: when the continuous operation time is less than or equal to the preset time, or at least part of the indoor units with cooling demand are operating in the conventional cooling mode, it is determined that only part of the indoor units are operating in the wind sensing mode;

[0122] Step S303: when the continuous operation time is greater than the preset time and all the indoor units with cooling demand have mode flags, it is determined that all the indoor units are operating in the wind sensing mode.

[0123] At the beginning of the indoor unit startup, the compressor just starts running. Even if the user turns on the wind sensing mode, the indoor unit still needs to lower the room temperature before entering the corresponding wind sensing mode. Therefore, when the outdoor unit determines whether to allow the indoor unit to enter the wind sensing mode, it must consider the continuous operation time of the compressor and the actual capacity requirements of the indoor unit. Specifically, when the continuous operation time of the compressor is less than or equal to the preset time, the outdoor unit does not allow the corresponding one or more indoor units to enter the wind sensing mode, and the frequency control of the compressor follows the control process of the non-full wind sensing mode; or when the outdoor unit summarizes the mode flags of the indoor units and finds that one or more indoor units are in the conventional cooling mode flag, the frequency control of the compressor follows the control process of the non-full wind sensing mode; when the continuous operation time of the compressor is greater than the preset time and the outdoor unit summarizes the mode flags of the indoor units and finds that all indoor units are in the wind sensing mode flag, the frequency control of the compressor follows the control process of the full wind sensing mode. The control process of the non-full wind sensing mode is different from that of the full wind sensing mode. The temperature characteristic value of the evaporator coil refers to different temperature thresholds to determine how to adjust, so there are differences in their adjustment methods. The following describes these two control processes respectively.

[0124] For the control process of the full wind sensing mode, such as step S300, when summarizing the actual capacity requirements of each indoor unit, the indoor unit with the lowest dew point temperature is selected from these indoor units, and the target evaporation temperature of the indoor unit is used as the reference evaporation temperature. Then, the frequency of the compressor is controlled according to the temperature characteristic values ​​of the evaporator coils of all indoor units and the reference evaporation temperature. Figure 7 , which can be achieved through the following steps:

[0125] Step S310, determining an average temperature characteristic value according to the temperature characteristic values ​​of the evaporator coils of all indoor units;

[0126] Step S320, determining a first evaporation temperature and a second evaporation temperature according to the reference evaporation temperature and the correction temperature, wherein the first evaporation temperature is lower than the second evaporation temperature;

[0127] Step S330, when the average temperature characteristic value is greater than the second evaporation temperature, increasing the frequency of the compressor based on the initial frequency;

[0128] Step S340, when the average temperature characteristic value is less than the first evaporation temperature, reducing the frequency of the compressor based on the initial frequency;

[0129] Step S350: when the average temperature characteristic value is between the first evaporation temperature and the second evaporation temperature, the frequency of the compressor is kept unchanged.

[0130] Calculate the temperature characteristic values ​​of the evaporator coils of all indoor units (the temperature characteristic value is represented by T2) to obtain the average temperature characteristic value, represented by T2_avg. The target evaporation temperature of the indoor unit with the lowest dew point temperature is the reference evaporation temperature, represented by T2x. The correction temperature is represented by m. The first evaporation temperature can be T2x-m, and the second evaporation temperature can be T2x+m. At this time, compare the average temperature characteristic value T2_avg with the first evaporation temperature T2x-m and the second evaporation temperature T2x+m.

[0131] When the average temperature characteristic value is greater than the second evaporation temperature, that is, T2_avg>T2x+m, the frequency of the compressor is increased based on the initial frequency of the compressor. When the average temperature characteristic value is less than the first evaporation temperature, that is, T2_avg<T2x-m, the frequency of the compressor is reduced based on the initial frequency of the compressor. When the average temperature characteristic value is between the first evaporation temperature and the second evaporation temperature, that is, T2x+m>T2_avg>T2x-m, the frequency of the compressor is kept unchanged.

[0132] The recommended value of the corrected temperature may be 1° C., and the recommended value range may be 0.5° C. to 1.5° C. The average temperature characteristic value may be directly calculated as the average of the temperature characteristic values ​​of all indoor units, or may be obtained based on other statistical calculations, such as weighted average, which is not limited here.

[0133] For the control process of the non-full wind sensing mode, such as step S300, when summarizing the actual capacity requirements of each indoor unit, the temperature characteristic value of the evaporator coil of the indoor unit is compared with the preset first temperature threshold and second temperature threshold to determine how to adjust. Figure 7 , which can be achieved through the following steps:

[0134] Step S410, determining an average temperature characteristic value according to the temperature characteristic values ​​of the evaporator coils of all indoor units;

[0135] Step S420, when the average temperature characteristic value is greater than the second temperature threshold, increasing the frequency of the compressor based on the initial frequency;

[0136] Step S430, when the average temperature characteristic value is less than the first temperature threshold, reducing the frequency of the compressor based on the initial frequency;

[0137] Step S440: when the average temperature characteristic value is between the first temperature threshold and the second temperature threshold, the frequency of the compressor is kept unchanged.

[0138] Similarly, the temperature characteristic values ​​of the evaporator coils of all indoor units are calculated (the temperature characteristic value is represented by T2) to obtain the average temperature characteristic value, represented by T2_avg, the first temperature threshold is represented by a, the second temperature threshold is represented by b, and the second temperature threshold b is greater than the first temperature threshold a.

[0139] When the average temperature characteristic value is greater than the second temperature threshold, that is, T2_avg>b, the frequency of the compressor is increased based on the initial frequency of the compressor. When the average temperature characteristic value is less than the first temperature threshold, that is, T2_avg<a, the frequency of the compressor is reduced based on the initial frequency of the compressor. When the average temperature characteristic value is between the first temperature threshold and the second temperature threshold, that is, b>T2_avg>a, the frequency of the compressor is kept unchanged.

[0140] The recommended value of the first temperature threshold may be 7°C, and the recommended value range may be 6°C to 8°C. The recommended value of the second temperature threshold may be 10°C, and the recommended value range may be 8°C to 11°C. The average temperature characteristic value may be directly calculated as the average value of the temperature characteristic values ​​of all indoor units, or may be obtained based on other statistical calculations, such as weighted average, which is not limited here.

[0141] It can be understood that after each adjustment of the compressor frequency, the actual capacity demand and the target evaporation temperature of the indoor unit are re-summed. If the total capacity demand calculated based on the actual capacity demand changes, the initial frequency of the compressor is re-determined, and the frequency is controlled based on the new initial frequency. At this time, the average temperature characteristic value T2_avg usually changes, and the frequency is controlled to increase, decrease or remain unchanged according to the changed T2_avg. When the initial frequency of the compressor is re-determined to be unchanged compared with the last initial frequency, that is, the total capacity demand has not changed, and the average temperature characteristic value T2_avg changes, then it is necessary to control the compressor frequency to increase, decrease or remain unchanged again based on the last adjusted frequency; for the case where the compressor frequency continuously increases, a maximum frequency threshold can be set. When the compressor frequency increases to the maximum frequency threshold, even if T2_avg>T2x+m or T2_avg>b, the compressor frequency is not controlled to increase. Similarly, for the case where the compressor frequency continuously decreases, a minimum frequency threshold can be set. When the compressor frequency decreases to the minimum frequency threshold, even if T2_avg<T2x-m or T2_avg<a, the compressor frequency is not controlled to decrease.

[0142] The above adjustment of the compressor frequency can control the frequency to rise or fall in different ways. In some embodiments, the frequency of the compressor is controlled in a gear manner, that is, each rise is one or more gears, and each fall is one or more gears. Specifically, the maximum frequency value and the minimum frequency value of the compressor are Fmax and Fmin, respectively. In the frequency range between Fmax and Fmin, it is divided according to the preset frequency interval △F, then the frequency size of each gear is △F, so the total number of sequences obtained by division is N = (Fmax-Fmin) / △F, N is a positive integer, and the value of △F can be 2 to 5Hz. In other words, the frequency adjustment of the compressor is performed in frequency gears, and one or more frequency gears are increased or decreased each time. Taking the example of increasing or decreasing a frequency gear each time, when T2_avg>T2x+m or T2_avg>b, the compressor frequency increases by 1 gear based on the initial frequency Fn (nth gear), that is, F(n+1). If the second collection and calculation result is a continued increase, it is increased by 1 gear again to obtain F(n+2). The limit number of gears for continuous increase can be x, that is, it will not increase after it increases to F(n+x). Similarly, when T2_avg<T2x-m or T2_avg<a, the compressor frequency decreases by 1 gear based on the initial frequency Fn (nth gear), that is, F(n-1). If the second collection and calculation result is a continued decrease, it is decreased by 1 gear again to obtain F(n-2), until it continuously decreases to F1 and no longer decreases.

[0143] Through the above method, in a multi-split air-conditioning system, if at least part of the multiple indoor units turn on the wind-sensing mode, then the actual capacity requirements and target evaporating temperatures of all the indoor units with cooling needs at this time are calculated, so as to determine the total capacity requirements corresponding to the outdoor units and the initial frequency of the compressor corresponding to the total capacity requirements; during the operation of these indoor units, based on the initial frequency of the compressor at this time, the frequency of the compressor is adjusted in different ways according to whether all of these indoor units are operating in the wind-sensing mode, so that the outdoor unit can meet the cooling needs of the indoor units under different mode combination operation conditions, thereby improving the user experience of the multi-split air-conditioning system; at the same time, by adjusting the frequency of the compressor in the above method, the temperature characteristic value of the evaporator coil of the indoor unit is taken into account, and the reference evaporating temperature or evaporating temperature threshold is set according to whether all of the indoor units are operating in the wind-sensing mode, so that the outdoor unit can meet the different mode requirements of the indoor units and reduce the condensation probability in the wind-sensing mode.

[0144] In addition, an embodiment of the present invention further provides a controller, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the above control method when executing the computer program.

[0145] Reference Fig. 9, taking the control processor 1001 and the memory 1002 in the controller 1000 as an example that they can be connected via a bus. The memory 1002, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 1002 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk memory, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 1002 may optionally include a memory remotely arranged relative to the control processor 1001, and these remote memories may be connected to the controller 1000 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0146] Those skilled in the art will understand that Fig. 9 The device structure shown in the figure does not constitute a limitation on the controller 1000, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0147] In addition, an embodiment of the present invention also provides an air conditioner, including the above-mentioned controller 1000, which executes the above-mentioned control method to ensure that the air conditioner can run for the full set operating time, fully utilize the remaining power of the battery, increase the cooling capacity of the RV air conditioner, and meet the user's demand for the operating time of the air conditioner.

[0148] In addition, an embodiment of the present invention further provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to execute the above control method, for example, Fig. 9 The execution of one of the processors 1001 in the embodiment may cause the one or more processors to execute the control method in the above method embodiment, for example, to execute the above described Figure 2 Steps S100 to S400 of the method, Figure 3 Steps S210 to S220 of the method, Figure 4 Steps S221 to S222 of the method, Figure 5 Steps S201 to S202 of the method, Figure 6 Steps S301 to S303 of the method, Figure 7 Steps S310 to S350 of the method and Figure 8 The method comprises steps S410 to S420.

[0149] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network nodes. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0150] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer-readable storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer-readable storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0151] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present application. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A control method for a multi-split air conditioning system, characterized in that: At least a portion of the indoor units in the multi-split air conditioning system that have cooling requirements are turned on in a wind sensing mode; the control method comprises: Determine the actual capacity requirement and target evaporating temperature for each indoor unit with cooling demand; Summarizing the actual capacity requirements to obtain a total capacity requirement of the outdoor unit, and determining an initial frequency of the compressor according to the total capacity requirement; When all the indoor units with cooling demand are operated in the wind sensing mode, the target evaporation temperature corresponding to the indoor unit with the lowest dew point temperature is used as the reference evaporation temperature, and the frequency of the compressor is adjusted based on the initial frequency according to the temperature characteristic values ​​of the evaporator coils of all the indoor units and the reference evaporation temperature; When the indoor units with cooling demand are only partially operated in the wind sensing mode, the frequency of the compressor is adjusted on the basis of the initial frequency according to the temperature characteristic values ​​of the evaporator coils of all the indoor units and a preset evaporation temperature threshold.

2. The control method according to claim 1, characterized in that: The actual capacity requirement is determined based on the cooling demand capacity value, rated cooling capacity, fan gear and operating mode of the indoor unit. The cooling demand capacity value is determined based on the indoor temperature and set temperature corresponding to the indoor unit. The operating mode includes the wind sensing mode and the conventional cooling mode.

3. The control method according to claim 1, characterized in that: The target evaporation temperature is determined according to the dew point temperature of the indoor unit, the heat transfer temperature difference correction parameter and the mode correction parameter corresponding to the wind sensing mode, and the dew point temperature is determined according to the indoor humidity and indoor temperature corresponding to the indoor unit.

4. The control method according to claim 1, characterized in that: The determining the initial frequency of the compressor according to the total capacity requirement comprises: Rounding the total capacity requirement, and using the rounded result as the frequency gear of the compressor; The frequency value corresponding to the frequency gear is used as the initial frequency of the compressor.

5. The control method according to claim 4, characterized in that: The step of using the frequency value corresponding to the frequency gear as the initial frequency of the compressor includes: Dividing the frequency range from the maximum frequency value to the minimum frequency value of the compressor into a plurality of frequency gears according to a preset frequency interval; The initial frequency of the compressor is calculated according to the rounding result, the preset frequency interval and the minimum frequency value.

6. The control method according to claim 1, characterized in that: The wind sense mode includes a no wind sense mode, a soft wind sense mode and an anti-direct blowing mode; the control method also includes: In the case of summarizing the actual capacity requirements, receiving a mode flag sent by the indoor unit, wherein the mode flag indicates that the indoor unit turns on one of the no wind mode, the soft wind mode, or the anti-direct blowing mode; After summarizing the total capacity requirements of the outdoor unit, the executable mode flag is returned to the indoor unit corresponding to the mode flag according to the mode flag and the operating status of the compressor. The executable mode flag is used to instruct the indoor unit to execute one of the no wind mode, the soft wind mode or the anti-direct blowing mode.

7. The control method according to claim 6, characterized in that: After the total capacity requirement of the outdoor unit is obtained through aggregation, the control method further includes: Recording the continuous operation time of the compressor; When the continuous operation time is less than or equal to the preset time, or at least a part of the indoor units with cooling demand are operated in the conventional cooling mode, it is determined that only a part of the indoor units with cooling demand are operated in the wind sensing mode; When the continuous operation time is greater than the preset time and all the indoor units with cooling demand have the mode flag, it is determined that all the indoor units with cooling demand are running in the wind sensing mode.

8. The control method according to claim 1, characterized in that: The adjusting the frequency of the compressor based on the initial frequency according to the temperature characteristic values ​​of the evaporator coils of all the indoor units and the reference evaporation temperature comprises: Determining an average temperature characteristic value according to the temperature characteristic values ​​of the evaporator coils of all the indoor units; determining a first evaporation temperature and a second evaporation temperature according to the reference evaporation temperature and the correction temperature, wherein the first evaporation temperature is less than the second evaporation temperature; When the average temperature characteristic value is greater than the second evaporation temperature, increasing the frequency of the compressor based on the initial frequency; When the average temperature characteristic value is less than the first evaporation temperature, reducing the frequency of the compressor based on the initial frequency; When the average temperature characteristic value is between the first evaporation temperature and the second evaporation temperature, the frequency of the compressor is kept unchanged.

9. The control method according to claim 1, characterized in that: The evaporation temperature threshold comprises a first temperature threshold and a second temperature threshold, the first temperature threshold is less than the second temperature threshold; and adjusting the frequency of the compressor based on the initial frequency according to the temperature characteristic values ​​of the evaporator coils of all the indoor units and the preset evaporation temperature threshold comprises: Determining an average temperature characteristic value according to the temperature characteristic values ​​of the evaporator coils of all the indoor units; When the average temperature characteristic value is greater than the second temperature threshold, increasing the frequency of the compressor based on the initial frequency; When the average temperature characteristic value is less than the first temperature threshold, reducing the frequency of the compressor based on the initial frequency; When the average temperature characteristic value is between the first temperature threshold and the second temperature threshold, the frequency of the compressor is kept unchanged.

10. The control method according to claim 8 or 9, characterized in that: The frequency adjustment of the compressor is performed in frequency gears, and one or more frequency gears are increased or decreased each time. The frequency gears are obtained by dividing the frequency interval from the maximum frequency value to the minimum frequency value of the compressor into multiple frequency gears according to preset frequency intervals.

11. A controller, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the control method according to any one of claims 1 to 10 when executing the computer program.

12. A multi-split air conditioning system, characterized in that: Includes the controller as claimed in claim 11.

13. A computer-readable storage medium, characterized in that: Computer executable instructions are stored, and the computer executable instructions are used to execute the control method according to any one of claims 1 to 10.

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