Multi-split air conditioner control method and device, multi-split air conditioner and storage medium

Abstract

The present disclosure provides a multi-split air conditioner control method and device, a multi-split air conditioner and a storage medium. The multi-split air conditioner control method comprises: in the case that the multi-split air conditioner is in a heating mode and the heating duration is not less than a first time length, acquiring a current system high pressure value and a current outdoor environment temperature at a preset frequency; in the case that a saturation temperature corresponding to the current system high pressure value is not less than a first temperature threshold value and the current outdoor environment temperature is not less than a second temperature threshold value, controlling a target operating frequency of a compressor, a first fan and a second fan.

Description

Technical Field

[0001] This disclosure relates to the field of air conditioning technology, and in particular to a multi-split air conditioning control method and device, a multi-split air conditioner and a storage medium. Background Technology

[0002] In the heating process of an air-source multi-split air conditioner, the outdoor heat exchanger acts as an evaporator, meaning its surface temperature is lower than the outdoor ambient temperature. Therefore, as outdoor air passes over the surface of the heat exchanger, the gaseous water vapor in the air condenses into liquid water and adheres to the surface, forming condensate. If this condensate is not drained in time, the water layer on the surface of the outdoor heat exchanger will thicken, creating thermal resistance and affecting the heat exchanger's ability to absorb heat from the outdoor environment. This is especially true when the outdoor ambient temperature or the heat exchanger surface temperature drops further, leading to the formation of solid water (such as frost or ice), which further deteriorates the heat absorption effect.

[0003] Existing air source multi-split air conditioners use natural drainage control for their outdoor heat exchangers. This means that after condensate forms in the outdoor heat exchanger, it is drained to the chassis by gravity. Summary of the Invention

[0004] The inventors noted that in related technologies, after condensation forms on the outdoor heat exchanger, the condensate is drained to the chassis by gravity. Since multi-split air conditioners typically rely on fan operation to create forced convection heat exchange, the high-speed airflow creates an upward or inward suction force, thus counteracting some of the gravitational effect. This slows down the downward flow of water, affecting the heat absorption efficiency of the outdoor heat exchanger and reducing heating comfort.

[0005] Accordingly, this disclosure provides a multi-split air conditioning control scheme, which achieves a balance between the condensate generation rate, the reverse suction generated by the fan operation, and the heating comfort by controlling the target operating frequency of the compressor and the target operating frequency of the first and second fans in the outdoor unit, thereby accelerating drainage while effectively ensuring heating comfort.

[0006] According to a first aspect of the present disclosure, a multi-split air conditioner control method is provided, comprising: when the multi-split air conditioner is in heating mode and the heating duration is not less than a first duration, acquiring the current system high pressure value and the current outdoor ambient temperature at a preset frequency; and controlling the target operating frequency of the compressor, the first fan and the second fan when the saturation temperature corresponding to the current system high pressure value is not less than a first temperature threshold and the current outdoor ambient temperature is not less than a second temperature threshold.

[0007] In some embodiments, controlling the target operating frequency of the compressor, the first fan, and the second fan includes: when the outdoor unit of the air conditioner is not in defrost mode, acquiring the current refrigerant temperature in the outdoor heat exchanger and the current system low pressure value at a preset frequency; determining the current control mode based on the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value; controlling the target operating frequency of the compressor using a first control method in the current control mode, and controlling the target operating frequencies of the first fan and the second fan using a second control method in the current control mode.

[0008] In some embodiments, determining the current control mode includes: when the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value meet a first condition, determining the current control mode as a first control mode; wherein the first condition includes: the current outdoor ambient temperature is within a first temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, and the saturation temperature corresponding to the current system low pressure is not less than a third temperature threshold.

[0009] In some embodiments, the first control method in the first control mode controls the target operating frequency of the compressor based on the current operating frequency of the compressor, the current system high pressure value, and the target high pressure value; the second control method in the first control mode controls the target operating frequency of the first fan based on the current operating frequency of the first fan, the current system low pressure value, and the target low pressure value, and controls the target operating frequency of the second fan based on the current operating frequency of the second fan, the current system low pressure value, and the target low pressure value.

[0010] In some embodiments, controlling the target operating frequency of the compressor includes: when the current system high pressure value is greater than the target high pressure value, calculating the difference between the current system high pressure value and the target high pressure value as a first difference value; calculating the product of the first difference value, a first frequency conversion coefficient, and a first correction coefficient to obtain a first parameter; and calculating the difference between the current operating frequency of the compressor and the first parameter to obtain the target operating frequency of the compressor.

[0011] In some embodiments, controlling the target operating frequency of the compressor includes: when the current system high pressure value is less than the target high pressure value, calculating the difference between the target high pressure value and the current system high pressure value as a second difference value; calculating the product of the second difference value, the second frequency conversion coefficient, and the second correction coefficient to obtain a second parameter; and calculating the sum of the current operating frequency of the compressor and the second parameter to obtain the target operating frequency of the compressor.

[0012] In some embodiments, controlling the target operating frequencies of the first fan and the second fan includes: when the current system low pressure value is greater than the target low pressure value, calculating the difference between the current system low pressure value and the target low pressure value as a third difference value; calculating the product of the third difference value and a third frequency conversion coefficient to obtain a third parameter; calculating the difference between the current operating frequency of the first fan and the third parameter to obtain the target operating frequency of the first fan; and calculating the difference between the current operating frequency of the second fan and the third parameter to obtain the target operating frequency of the second fan.

[0013] In some embodiments, determining the target operating frequencies of the first fan and the second fan includes: if the current system low pressure value is less than the target low pressure value, calculating the difference between the target low pressure value and the current system low pressure value as a fourth difference value; calculating the product of the fourth difference value and a fourth frequency conversion coefficient to obtain a fourth parameter; calculating the sum of the current operating frequency of the first fan and the fourth parameter to obtain the target operating frequency of the first fan; and calculating the sum of the current operating frequency of the second fan and the fourth parameter to obtain the target operating frequency of the second fan.

[0014] In some embodiments, determining the current control mode includes: when the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value meet a second condition, determining the current control mode as a second control mode; wherein the second condition includes: the current outdoor ambient temperature is within a second temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, the saturation temperature corresponding to the current system low pressure is not less than a fourth temperature threshold, the upper limit of the second temperature range is the lower limit of the first temperature range, and the fourth temperature threshold is less than the third temperature threshold.

[0015] In some embodiments, the first control method in the second control mode controls the target operating frequency of the compressor based on the compressor's current operating frequency, the current system high pressure value, and the target high pressure value.

[0016] In some embodiments, the second control method of the second control mode includes: when the system low pressure value is greater than the target low pressure value, controlling the target operating frequency of the first fan according to the current operating frequency of the first fan and the first control parameter, and controlling the target operating frequency of the second fan according to the current operating frequency of the second fan and the second control parameter, wherein the first control parameter and the second control parameter are negative numbers not greater than -1; when the system low pressure value is not greater than the target low pressure value, using the current operating frequency of the first fan as the target operating frequency of the first fan, and using the current operating frequency of the second fan as the target operating frequency of the second fan.

[0017] In some embodiments, controlling the target operating frequency of the first fan and the target operating frequency of the second fan includes: when the system low pressure value is greater than the target low pressure value, determining the target operating frequency of the first fan based on the product of the current operating frequency of the first fan and the first control parameter; and after the first fan has been running at the target operating frequency of the first fan for a predetermined period of time, determining the target operating frequency of the second fan based on the product of the current operating frequency of the second fan and the second control parameter.

[0018] In some embodiments, when in the second control mode, the second control mode is exited when any of the following conditions are met: the duration for which the system low pressure value is not greater than the target low pressure value is greater than a second duration; the duration for which the change in the system high pressure value is greater than a first change threshold is greater than the second duration; and the duration of continuous operation in the second control mode is greater than a third duration.

[0019] In some embodiments, determining the current control mode includes: when the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value meet a third condition, determining the current control mode as a third control mode; wherein the third condition includes: the current outdoor ambient temperature is within a third temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, the saturation temperature corresponding to the current system low pressure is not less than a fifth temperature threshold, the upper limit of the third temperature range is the lower limit of the second temperature range, and the fifth temperature threshold is less than the fourth temperature threshold.

[0020] In some embodiments, the first control method in the third control mode controls the target operating frequency of the compressor based on the compressor's current operating frequency, the current system high pressure value, and the target high pressure value.

[0021] In some embodiments, the second control method of the third control mode includes: when the system low pressure value is greater than the target low pressure value, taking the current operating frequency of the first fan as the target operating frequency of the first fan, and controlling the target operating frequency of the second fan according to the current operating frequency of the second fan and a third control parameter, wherein the third control parameter is a negative number not greater than -1; when the system low pressure value is not greater than the target low pressure value, taking the current operating frequency of the first fan as the target operating frequency of the first fan, and taking the current operating frequency of the second fan as the target operating frequency of the second fan.

[0022] In some embodiments, when the system low pressure value is greater than the target low pressure value, the target operating frequency of the second fan is the product of the current operating frequency of the second fan and the third control parameter.

[0023] In some embodiments, when in the third control mode, the third control mode is exited if any of the following conditions are met: the duration for which the system low pressure value is not greater than the target low pressure value is greater than a fourth duration; the duration for which the change in the system high pressure value is greater than the second change threshold is greater than the fourth duration; or the duration of continuous operation in the third control mode is greater than a fifth duration.

[0024] In some embodiments, determining the current control mode includes: when the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value meet a fourth condition, determining the current control mode as a fourth control mode; wherein the fourth condition includes: the current outdoor ambient temperature is within a fourth temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, the saturation temperature corresponding to the current system low pressure is not less than a sixth temperature threshold, the upper limit of the fourth temperature range is the lower limit of the third temperature range, and the sixth temperature threshold is less than the fifth temperature threshold.

[0025] In some embodiments, the first control method of the fourth control mode includes: when the system high pressure value is greater than the target high pressure value, controlling the target operating frequency of the compressor according to the current operating frequency of the compressor and the fourth control parameter, wherein the fourth control parameter is a positive number not greater than 1; when the system high pressure value is not greater than the target high pressure value, using the current operating frequency of the compressor as the target operating frequency of the compressor.

[0026] In some embodiments, when the system low pressure value is greater than the target low pressure value, the target operating frequency of the compressor is the product of the current operating frequency of the compressor and the fourth control parameter;

[0027] In some embodiments, the second control method of the fourth control mode includes: when the system low pressure value is greater than the target low pressure value, controlling the target operating frequency of the first fan according to the current operating frequency of the first fan and the fifth control parameter, and controlling the target operating frequency of the second fan according to the current operating frequency of the second fan and the fifth control parameter, wherein the fifth control parameter is a positive number less than 1; when the system low pressure value is not greater than the target low pressure value, using the current operating frequency of the first fan as the target operating frequency of the first fan, and using the current operating frequency of the second fan as the target operating frequency of the second fan.

[0028] In some embodiments, when the system low pressure value is greater than the target low pressure value, the target operating frequency of the first fan is the product of the current operating frequency of the first fan and the fifth control parameter, and the target operating frequency of the second fan is the product of the current operating frequency of the second fan and the fifth control parameter.

[0029] In some embodiments, when in the fourth control mode, the fourth control mode is exited if any of the following conditions are met: the duration for which the system low pressure value is not greater than the target low pressure value is greater than a sixth duration; the duration for which the change in the system high pressure value is greater than the third change threshold is greater than the sixth duration; or the continuous running time in the fourth control mode is greater than a seventh duration.

[0030] In some embodiments, when the outdoor unit of the air conditioner enters defrosting mode, the current refrigerant temperature in the outdoor heat exchanger is obtained at a preset frequency; when the current refrigerant temperature meets a fifth condition, the current control mode is determined to be the fifth control mode, wherein the fifth condition includes: the current refrigerant temperature is not less than a preset defrosting threshold; the target operating frequency of the compressor is controlled using a first control method in the fifth control mode, and the target operating frequencies of the first fan and the second fan are controlled using a second control method in the fifth control mode.

[0031] In some embodiments, the first control method in the fifth control mode controls the target operating frequency of the compressor based on the current operating frequency of the compressor and a sixth control parameter, wherein the sixth control parameter is a positive number not less than 1.

[0032] In some embodiments, the target operating frequency of the compressor is the product of the compressor's current operating frequency and a sixth control parameter.

[0033] In some embodiments, the second control method in the fifth control mode includes: controlling the target operating frequency of the first fan according to the current operating frequency of the first fan and a seventh control parameter, wherein the seventh control parameter is a negative number not greater than -1; and controlling the target operating frequency of the second fan according to the current operating frequency of the second fan and the seventh control parameter.

[0034] In some embodiments, the target operating frequency of the first fan is the product of the current operating frequency of the first fan and the seventh control parameter; the target operating frequency of the second fan is the product of the current operating frequency of the second fan and the seventh control parameter.

[0035] In some embodiments, when in the fifth control mode, the fifth control mode is exited when the outdoor unit of the air conditioner exits the defrosting mode.

[0036] According to a second aspect of the present disclosure, a multi-split air conditioner control device is provided, comprising: a first processing module configured to acquire, at a preset frequency, a current system high pressure value and a current outdoor ambient temperature when the multi-split air conditioner is in heating mode and the heating duration is not less than a first duration; and a second processing module configured to control a target operating frequency of a compressor, a first fan, and a second fan when the saturation temperature corresponding to the current system high pressure value is not less than a first temperature threshold and the current outdoor ambient temperature is not less than a second temperature threshold.

[0037] According to a third aspect of the present disclosure, a multi-split air conditioning control device is provided, comprising: a memory configured to store instructions; and a processor coupled to the memory, the processor being configured to execute instructions stored in the memory to implement the method as described in any of the above embodiments.

[0038] According to a fourth aspect of the present disclosure, a multi-split air conditioner is provided, comprising: a multi-split air conditioner control device as described in any of the above embodiments; a first pressure sensor configured to detect a system high pressure value in a compressor exhaust pipe and send the system high pressure value to the multi-split air conditioner control device; and a first temperature sensor configured to detect an outdoor ambient temperature value and send the outdoor ambient temperature value to the multi-split air conditioner control device.

[0039] In some embodiments, the multi-split air conditioner further includes: a second pressure sensor configured to detect a system low pressure value in the compressor suction line and send the system low pressure value to the multi-split air conditioner control device; and a second temperature sensor configured to detect a refrigerant temperature in the outdoor heat exchanger and send the refrigerant temperature to the multi-split air conditioner control device.

[0040] According to a fifth aspect of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions that, when executed by a processor, implement the method as described in any of the above embodiments.

[0041] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic flowchart of a multi-split air conditioning control method according to an embodiment of the present disclosure;

[0044] Figure 2 This is a schematic flowchart of a multi-split air conditioning control method according to another embodiment of the present disclosure;

[0045] Figure 3 This is a schematic diagram of the structure of a multi-split air conditioning control device according to an embodiment of the present disclosure;

[0046] Figure 4 This is a schematic diagram of the structure of a multi-split air conditioning control device according to another embodiment of the present disclosure;

[0047] Figure 5 This is a schematic diagram of the structure of a multi-split air conditioner according to an embodiment of the present disclosure;

[0048] Figure 6 This is a schematic diagram of the structure of an outdoor unit of a multi-split air conditioner according to an embodiment of the present disclosure. Detailed Implementation

[0049] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0050] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure.

[0051] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0052] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0053] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0054] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0055] Figure 1 This is a schematic flowchart illustrating a multi-split air conditioning control method according to an embodiment of the present disclosure. In some embodiments, the following multi-split air conditioning control method is executed by a multi-split air conditioning control device.

[0056] In step 101, when the multi-split air conditioner is in heating mode and the heating duration is not less than the first duration, the current system high pressure value and the current outdoor ambient temperature are obtained at a preset frequency.

[0057] It should be noted that when a multi-split air conditioner is in heating mode, the heating capacity requirement is Q≥0KW.

[0058] For example, the first duration is 35 minutes.

[0059] In some embodiments, a pressure sensor installed on the compressor exhaust pipe is used to collect the current pressure value in the exhaust pipe as the current system high pressure value. A temperature sensor installed in the outdoor unit is used to collect the current outdoor ambient temperature.

[0060] In step 102, when the saturation temperature corresponding to the current system high pressure value is not less than the first temperature threshold and the current outdoor ambient temperature is not less than the second temperature threshold, the target operating frequency of the compressor, the first fan and the second fan are controlled.

[0061] For example, the first temperature threshold is 35°C, and the second temperature threshold is 0°C. In some embodiments, the steps described above for controlling the target operating frequencies of the compressor, the first fan, and the second fan are as follows: Figure 2 As shown.

[0062] In step 201, when the outdoor unit of the air conditioner is not in defrost mode, the current refrigerant temperature in the outdoor heat exchanger and the current system low pressure value are obtained at a preset frequency.

[0063] In some embodiments, a pressure sensor installed on the compressor suction line is used to collect the current pressure value in the discharge line as the current system low pressure value. A temperature sensor installed on the outdoor heat exchanger is used to collect the current refrigerant temperature in the outdoor heat exchanger.

[0064] In step 202, the current control mode is determined based on the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value.

[0065] In step 203, the target operating frequency of the compressor is controlled by the first control method in the current control mode, and the target operating frequencies of the first fan and the second fan are controlled by the second control method in the current control mode.

[0066] This disclosure effectively ensures heating comfort while controlling drainage by adjusting the target operating frequency of the compressor and the target operating frequencies of the first and second fans in the outdoor unit.

[0067] I. First Control Mode

[0068] When the current outdoor ambient temperature, current refrigerant temperature, and current system low pressure meet the first condition, the current control mode is determined to be the first control mode. The first condition includes: the current outdoor ambient temperature is within the first temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, and the saturation temperature corresponding to the current system low pressure is not less than the third temperature threshold.

[0069] For example, the first temperature range is [15℃, 50℃), and the third temperature threshold is 10℃.

[0070] The first control method in the first control mode controls the target operating frequency of the compressor based on the compressor's current operating frequency, the current system high pressure value, and the target high pressure value.

[0071] For example, if the current system high pressure value is greater than the target high pressure value, the difference between the current system high pressure value and the target high pressure value is calculated as the first difference value. The product of the first difference value, the first frequency conversion coefficient and the first correction coefficient is calculated to obtain the first parameter. The difference between the current operating frequency of the compressor and the first parameter is calculated to obtain the target operating frequency of the compressor.

[0072] For example, when the current system high pressure value Vh is greater than the target high pressure value Voh, the target operating frequency Po of the compressor is as shown in formula (1).

[0073] Po=Pc-(Vh-Voh)*X1*K1 (1)

[0074] Where Pc is the current operating frequency of the compressor, X1 is the first frequency conversion coefficient, and K1 is the first correction coefficient. For example, X1 is 2Hz, and the value of K1 ranges from [0.1, 2]. Through the above processing, when the current system high pressure value is greater than the target high pressure value, the target operating frequency of the compressor is reduced in a specified manner, thereby avoiding excessively high operating frequency of the compressor.

[0075] For example, if the current system high pressure value is less than the target high pressure value, the difference between the target high pressure value and the current system high pressure value is calculated as the second difference value. The product of the second difference value, the second frequency conversion coefficient, and the second correction coefficient is calculated to obtain the second parameter. The sum of the current operating frequency of the compressor and the second parameter is calculated to obtain the target operating frequency of the compressor.

[0076] For example, when the current system high pressure value Vh is less than the target high pressure value Voh, the target operating frequency Po of the compressor is as shown in formula (2).

[0077] Po=Pc+(Voh-Vh)*X2*K2 (2)

[0078] Where Pc is the current operating frequency of the compressor, X2 is the second frequency conversion coefficient, and K2 is the second correction coefficient. For example, X2 is 2Hz, and the value of K2 ranges from [0.1, 2]. Through the above processing, when the current system high pressure value is lower than the target high pressure value, the target operating frequency of the compressor is increased in a specified manner, thereby ensuring that the compressor operates at a higher operating frequency.

[0079] The second control method in the first control mode controls the target operating frequency of the first fan based on the current operating frequency of the first fan, the current system low pressure value, and the target low pressure value, and controls the target operating frequency of the second fan based on the current operating frequency of the second fan, the current system low pressure value, and the target low pressure value.

[0080] For example, if the current system low pressure value is greater than the target low pressure value, the difference between the current system low pressure value and the target low pressure value is calculated as the third difference value. The product of the third difference value and the third frequency conversion coefficient is calculated to obtain the third parameter. The difference between the current operating frequency of the first fan and the third parameter is calculated to obtain the target operating frequency of the first fan. The difference between the current operating frequency of the second fan and the third parameter is calculated to obtain the target operating frequency of the second fan.

[0081] For example, when the current system low pressure value Vl is greater than the target low pressure value Vol, the target operating frequency Po1 of the first fan is as shown in formula (3), and the target operating frequency Po2 of the second fan is as shown in formula (4).

[0082] Po1=Pc1-(Vl-Vol)*X3 (3)

[0083] Po2=Pc2-(Vl-Vol)*X3 (4)

[0084] Where Pc1 is the current operating frequency of the first fan, Pc2 is the current operating frequency of the second fan, and X3 is the third frequency conversion coefficient. For example, X3 is 1Hz. Through the above processing, when the current system low pressure value is greater than the target low pressure value, the target operating frequencies of the first and second fans are reduced in a specified manner, thereby avoiding excessively high operating frequencies of the first and second fans.

[0085] For example, if the current system low pressure value is less than the target low pressure value, the difference between the target low pressure value and the current system low pressure value is calculated as the fourth difference value. The product of the fourth difference value and the fourth frequency conversion coefficient is calculated to obtain the fourth parameter. The sum of the current operating frequency of the first fan and the fourth parameter is calculated to obtain the target operating frequency of the first fan. The sum of the current operating frequency of the second fan and the fourth parameter is calculated to obtain the target operating frequency of the second fan.

[0086] For example, when the current system low pressure value Vl is less than the target low pressure value Vol, the target operating frequency Po1 of the first fan is as shown in formula (5), and the target operating frequency Po2 of the second fan is as shown in formula (6).

[0087] Po1=Pc1+(Vol-Vl)*X4 (5)

[0088] Po2=Pc2+(Vol-Vl)*X4 (6)

[0089] Where Pc1 is the current operating frequency of the first fan, Pc2 is the current operating frequency of the second fan, and X4 is the fourth frequency conversion coefficient. For example, X4 is 1Hz. Through the above processing, when the current system low pressure value is lower than the target low pressure value, the target operating frequencies of the first and second fans are increased in a specified manner, thereby ensuring that the first and second fans operate at a higher operating frequency.

[0090] It should be noted that in the first control mode described above, due to the high outdoor ambient temperature, the condensate formation rate is low. In this situation, the compressor, first fan, and second fan operate at a higher frequency. The reverse suction generated by the fan operation does not significantly affect rapid drainage. This achieves a balance between the condensate formation rate, the reverse suction generated by the fan operation, and heating comfort, effectively ensuring a good user experience while achieving rapid drainage.

[0091] In some embodiments, when the multi-split air conditioner is in the first control mode, if the conditions of other control modes are met, the multi-split air conditioner will exit the first control mode and enter another control mode. For example, the present invention will also describe a second control mode, a third control mode, a fourth control mode, and a fifth control mode. For example, when the multi-split air conditioner is in the first control mode, if the conditions of the second control mode are met, the multi-split air conditioner will exit the first control mode and enter the second control mode.

[0092] II. Second Control Mode

[0093] When the current outdoor ambient temperature, current refrigerant temperature, and current system low pressure meet the second condition, the current control mode is determined to be the second control mode. The second condition includes: the current outdoor ambient temperature is within the second temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, the saturation temperature corresponding to the current system low pressure is not less than the fourth temperature threshold, the upper limit of the second temperature range is the lower limit of the first temperature range, and the fourth temperature threshold is less than the third temperature threshold.

[0094] For example, the second temperature range is [10℃, 15℃), and the fourth temperature threshold is 5℃.

[0095] The first control method in the second control mode controls the compressor's target operating frequency based on the compressor's current operating frequency, the current system high pressure value, and the target high pressure value.

[0096] It should be noted that the first control method in the second control mode is the same as the first control method in the first control mode described above. Therefore, for the sake of simplicity, it will not be described in detail here.

[0097] The second control method of the second control mode includes:

[0098] 1) When the system low pressure value is greater than the target low pressure value, the target operating frequency of the first fan is controlled according to the current operating frequency of the first fan and the first control parameter, and the target operating frequency of the second fan is controlled according to the current operating frequency of the second fan and the second control parameter, wherein the first control parameter and the second control parameter are negative numbers not greater than -1.

[0099] In some embodiments, when the system low pressure value is greater than the target low pressure value, the target operating frequency Po1 of the first fan is determined according to the product of the current operating frequency Pc1 of the first fan and the first control parameter K3, as shown in formula (7).

[0100] Po1=Pc1*K3 (7)

[0101] The value of K3 ranges from -1.2 to -1.0. For example, K3 = -1.2.

[0102] It should be noted that since K3 is a negative number not greater than -1, when the current operating frequency Pc1 of the first fan is positive, the target operating frequency Po1 of the first fan is negative. This means the operating direction of the first fan will reverse, and its operating frequency will increase. Furthermore, the target operating frequency of the first fan will not exceed its physical frequency limit.

[0103] Next, after the first fan operates for a predetermined time (e.g., 60 seconds) according to the target operating frequency of the first fan, the target operating frequency Po2 of the second fan is determined according to the product of the current operating frequency Pc2 of the second fan and the second control parameter K4, as shown in formula (8).

[0104] Po2=Pc2*K4 (8)

[0105] The value of K4 ranges from -1.2 to -1.0. For example, K4 = -1.2.

[0106] It should be noted that since K4 is a negative number not greater than -1, when the current operating frequency Pc2 of the second fan is positive, the target operating frequency Po2 of the second fan is negative. This means the operating direction of the second fan will reverse, and its operating frequency will increase. Furthermore, the target operating frequency of the second fan will not exceed its physical frequency limit.

[0107] 2) When the system low pressure value is not greater than the target low pressure value, the current operating frequency of the first fan is taken as the target operating frequency of the first fan, and the current operating frequency of the second fan is taken as the target operating frequency of the second fan.

[0108] It's important to note that the outdoor ambient temperature is lower in the second control mode compared to the first, leading to an increased condensate formation rate. In this situation, if the first and second fans are operated at a higher frequency under the first control mode, the reverse suction generated by the fans would hinder rapid drainage. Therefore, in the second control mode, while controlling the compressor, first fan, and second fan to operate at a higher frequency, the first and second fans are controlled to rotate clockwise for a period of time, then counter-clockwise for the next period, and then clockwise again for the following period. This intermittent change in the direction of the first and second fans reduces the reverse suction generated by the fans. This achieves a balance between the condensate formation rate, the reverse suction generated by the fans, and heating comfort, effectively improving the user experience while accelerating drainage.

[0109] In some embodiments, when the multi-split air conditioner is in the second control mode, the second control mode is exited when any of the following conditions are met: the duration for which the system low pressure value is not greater than the target low pressure value is greater than the second duration (e.g., 5 seconds); the duration for which the change in the system high pressure value is greater than the first change threshold (e.g., 10%) is greater than the second duration; or the continuous running time in the second control mode is greater than the third duration (e.g., 60 seconds).

[0110] III. Third Control Mode

[0111] When the current outdoor ambient temperature, current refrigerant temperature, and current system low pressure meet the third condition, the current control mode is determined to be the third control mode. The third condition includes: the current outdoor ambient temperature is within the third temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, the saturation temperature corresponding to the current system low pressure is not less than the fifth temperature threshold, the upper limit of the third temperature range is the lower limit of the second temperature range, and the fifth temperature threshold is less than the fourth temperature threshold.

[0112] For example, the third temperature range is [7℃, 10℃), and the fifth temperature threshold is 2℃.

[0113] The first control method in the third control mode controls the compressor's target operating frequency based on the compressor's current operating frequency, the current system high pressure value, and the target high pressure value.

[0114] It should be noted that the first control method in the third control mode is the same as the first control method in the first control mode described above. Therefore, for the sake of simplicity, it will not be described in detail here.

[0115] The second control method of the third control mode includes:

[0116] When the system low pressure value is greater than the target low pressure value, the current operating frequency of the first fan is taken as the target operating frequency of the first fan. The target operating frequency of the second fan is controlled according to the current operating frequency of the second fan and the third control parameter, where the third control parameter is a negative number not greater than -1.

[0117] In some embodiments, when the system low pressure value is greater than the target low pressure value, the target operating frequency Po2 of the second fan is the product of the current operating frequency Pc2 of the second fan and the third control parameter K5, as shown in formula (9).

[0118] Po2=Pc2*K5 (9)

[0119] The value of K5 ranges from -1.2 to -1.0. For example, K5 = -1.2.

[0120] It should be noted that since K5 is a negative number not greater than -1, when the current operating frequency Pc2 of the second fan is positive, the target operating frequency Po2 of the second fan is negative. This means the operating direction of the second fan will reverse, and its operating frequency will increase. Furthermore, the target operating frequency of the second fan will not exceed its physical frequency limit.

[0121] When the system low pressure value is not greater than the target low pressure value, the current operating frequency of the first fan is taken as the target operating frequency of the first fan, and the current operating frequency of the second fan is taken as the target operating frequency of the second fan.

[0122] It's important to note that the outdoor ambient temperature in the third control mode is further reduced compared to the second mode, leading to a further increase in condensate formation. In this situation, if the first and second fans are controlled according to the second mode, the reverse suction generated by the fans will still affect rapid drainage. Therefore, in the third control mode, while controlling the compressor and second fan to operate at a higher frequency and the first fan to operate at a lower frequency, the rotation direction of the first fan remains constant, and the second fan rotates forward for a period of time, then reverses for the next period, and then rotates forward again. This intermittent change in the direction of the second fan reduces the reverse suction generated by the fans. This achieves a balance between the condensate formation rate, the reverse suction generated by the fans, and heating comfort, effectively improving the user experience while accelerating drainage.

[0123] In some embodiments, when the multi-split air conditioner is in the third control mode, it exits the third control mode if any of the following conditions are met: the duration for which the system low pressure value is not greater than the target low pressure value is greater than a fourth duration (e.g., 5 seconds); the duration for which the change in the system high pressure value is greater than a second change threshold (e.g., 10%) is greater than a fourth duration; or the duration of continuous operation in the third control mode is greater than a fifth duration (e.g., 60 seconds).

[0124] IV. Fourth Control Mode

[0125] When the current outdoor ambient temperature, current refrigerant temperature, and current system low pressure meet the fourth condition, the current control mode is determined to be the fourth control mode. The fourth condition includes: the current outdoor ambient temperature is within the fourth temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, the saturation temperature corresponding to the current system low pressure is not less than the sixth temperature threshold, the upper limit of the fourth temperature range is the lower limit of the third temperature range, and the sixth temperature threshold is less than the fifth temperature threshold.

[0126] For example, the fourth temperature range is [4℃, 7℃), and the sixth temperature threshold is 0℃.

[0127] The first control method of the fourth control mode includes:

[0128] 1) When the system high pressure value is greater than the target high pressure value, the target operating frequency of the compressor is controlled according to the current operating frequency of the compressor and the fourth control parameter, wherein the fourth control parameter is a positive number not greater than 1.

[0129] In some embodiments, when the system low pressure value is greater than the target low pressure value, the target operating frequency Po of the compressor is the product of the current operating frequency Pc of the compressor and the fourth control parameter K6, as shown in formula (10).

[0130] Po=Pc*K6 (10)

[0131] The value of K6 ranges from [0.6, 1.0]. For example, K6 = 0.8.

[0132] Since K6 is less than 1, the target operating frequency of the compressor will be reduced compared to the current operating frequency of the compressor.

[0133] 2) When the system high pressure value is not greater than the target high pressure value, the current operating frequency of the compressor is taken as the target operating frequency of the compressor.

[0134] The second control method of the fourth control mode includes:

[0135] 1) When the system low pressure value is greater than the target low pressure value, the target operating frequency of the first fan is controlled according to the current operating frequency of the first fan and the fifth control parameter, and the target operating frequency of the second fan is controlled according to the current operating frequency of the second fan and the fifth control parameter, wherein the fifth control parameter is a positive number less than 1.

[0136] In some embodiments, when the system low pressure value is greater than the target low pressure value, the target operating frequency Po1 of the first fan is the product of the current operating frequency Pc1 of the first fan and the fifth control parameter K7, as shown in formula (11), and the target operating frequency Po2 of the second fan is the product of the current operating frequency Pc2 of the second fan and the fifth control parameter K7, as shown in formula (12).

[0137] Po1=Pc1*K7 (11)

[0138] Po2=Pc2*K7 (12)

[0139] The value of K7 ranges from [0.1, 0.9]. For example, K7 = 0.8.

[0140] Since K7 is less than 1, the target operating frequencies of the first and second fans will decrease compared to their current operating frequencies.

[0141] 2) When the system low pressure value is not greater than the target low pressure value, the current operating frequency of the first fan is taken as the target operating frequency of the first fan, and the current operating frequency of the second fan is taken as the target operating frequency of the second fan.

[0142] It's important to note that compared to the third control mode, the fourth control mode corresponds to a further decrease in outdoor ambient temperature, leading to a further increase in the condensate formation rate. In this situation, if the first and second fans are controlled according to the third control mode, the reverse suction generated by the fan operation will still affect rapid drainage. Therefore, in the fourth control mode, the compressor, first fan, and second fan are controlled to operate at a lower frequency, thereby reducing the reverse suction generated by the fan operation. This achieves a balance between the condensate formation rate, the reverse suction generated by the fan operation, and heating comfort, effectively improving the user experience while accelerating drainage.

[0143] In some embodiments, when the multi-split air conditioner is in the fourth control mode, it exits the fourth control mode if any of the following conditions are met: the duration for which the system low pressure value is not greater than the target low pressure value is greater than the sixth duration (e.g., 5 seconds); the duration for which the change in the system high pressure value is greater than the third change threshold (e.g., 8%) is greater than the sixth duration; or the continuous running time in the fourth control mode is greater than the seventh duration (e.g., 60 seconds).

[0144] V. Fifth Control Mode

[0145] When the outdoor unit of the air conditioner enters defrost mode, the current refrigerant temperature in the outdoor heat exchanger is acquired at a preset frequency. If the current refrigerant temperature meets a fifth condition, the current control mode is determined to be the fifth control mode. The fifth condition includes: the current refrigerant temperature is not less than a preset defrost threshold.

[0146] In some embodiments, the preset defrost threshold is the difference between the defrost exit temperature value and the correction temperature value. For example, the defrost exit temperature value is 12°C and the correction temperature value is 1°C.

[0147] Next, the target operating frequency of the compressor is controlled by the first control method in the fifth control mode, and the target operating frequencies of the first and second fans are controlled by the second control method in the fifth control mode.

[0148] In some embodiments, the first control method in the fifth control mode controls the target operating frequency of the compressor based on the current operating frequency of the compressor and the sixth control parameter, wherein the sixth control parameter is a positive number not less than 1.

[0149] For example, the target operating frequency Po of the compressor is the product of the current operating frequency Pc of the compressor and the sixth control parameter K8, as shown in formula (13).

[0150] Po=Pc*K8 (13)

[0151] The value of K7 is in the range of [1.0, 1.5]. For example, K8 = 1.4.

[0152] In some embodiments, the second control method in the fifth control mode includes: controlling the target operating frequency of the first fan according to the current operating frequency of the first fan and a seventh control parameter, wherein the seventh control parameter is a negative number not greater than -1. The target operating frequency of the second fan is controlled according to the current operating frequency of the second fan and the seventh control parameter. Furthermore, the target operating frequency of the first fan does not exceed the physical frequency limit of the first fan, and the target operating frequency of the second fan does not exceed the physical frequency limit of the second fan.

[0153] For example, the target operating frequency Po1 of the first fan is the product of the current operating frequency Pc1 of the first fan and the seventh control parameter K9, as shown in formula (14). The target operating frequency Po2 of the second fan is the product of the current operating frequency Pc2 of the second fan and the seventh control parameter K9, as shown in formula (15).

[0154] Po1=Pc1*K9 (14)

[0155] Po2=Pc2*K9 (15)

[0156] The value range of K9 is [-1.2, -1.0]. For example, K9 = -1.2.

[0157] It's important to note that when the outdoor unit is in defrost mode, the outdoor heat exchanger switches from evaporator to condenser, using high temperatures to remove frost or ice. However, the indoor heat exchanger also switches to evaporator during this time. In this situation, if the first and second fans operate, the indoor temperature will drop; if they stop, it hinders rapid drainage. Therefore, in the fifth control mode, while controlling the compressor, first fan, and second fan to operate at a higher frequency, the first and second fans are controlled to rotate forward for a period of time, then reverse for the next period, and then forward again for the following period. By intermittently changing the direction of the first and second fans, the reverse suction generated by the fans is reduced, preventing a drop in indoor temperature. This achieves a balance between the rate of condensate formation, the reverse suction generated by the fans, and heating comfort, accelerating drainage while effectively improving the user experience.

[0158] In some embodiments, when in the fifth control mode, the fifth control mode is exited when the outdoor unit of the air conditioner exits the defrosting mode.

[0159] It's important to note that entering the fifth control mode requires the outdoor unit to be in defrost mode. If the outdoor unit exits defrost mode, the outdoor heat exchanger will no longer function as a high-temperature heat source, and the fifth control mode will no longer be applicable. After exiting the fifth control mode, you can enter the first, second, third, or fourth control modes mentioned above, depending on the specific situation, to achieve a balance between the condensate generation rate, the reverse suction generated by the fan, and heating comfort, thus accelerating drainage while effectively ensuring heating comfort.

[0160] In the multi-split air conditioning control method provided in the above embodiments of this disclosure, by controlling the target operating frequency of the compressor and the target operating frequencies of the first and second fans in the outdoor unit, a balance can be achieved between the condensate generation rate, the reverse suction generated by the fan operation, and the heating comfort, thereby accelerating drainage while effectively ensuring heating comfort.

[0161] Figure 3 This is a schematic diagram of the structure of a multi-split air conditioning control device according to an embodiment of this disclosure. Figure 3 As shown, the multi-split air conditioning control device includes a first processing module 31 and a second processing module 32.

[0162] The first processing module 31 is configured to acquire the current system high pressure value and the current outdoor ambient temperature at a preset frequency when the multi-split air conditioner is in heating mode and the heating duration is not less than a first duration.

[0163] It should be noted that when a multi-split air conditioner is in heating mode, the heating capacity requirement is Q≥0KW.

[0164] For example, the first duration is 35 minutes.

[0165] In some embodiments, the first processing module 31 uses a pressure sensor installed on the compressor exhaust pipe to collect the current pressure value in the exhaust pipe as the current system high pressure value. It also uses a temperature sensor installed in the outdoor unit to collect the current outdoor ambient temperature.

[0166] The second processing module 32 is configured to control the target operating frequency of the compressor, the first fan and the second fan when the saturation temperature corresponding to the current system high pressure value is not less than the first temperature threshold and the current outdoor ambient temperature is not less than the second temperature threshold.

[0167] For example, the first temperature threshold is 35℃, and the second temperature threshold is 0℃.

[0168] In some embodiments, when the outdoor unit of the air conditioner is not in defrost mode, the second processing module 32 obtains the current refrigerant temperature in the outdoor heat exchanger and the current system low pressure value at a preset frequency.

[0169] In some embodiments, the second processing module 32 uses a pressure sensor installed on the compressor suction line to collect the current pressure value in the discharge line as the current system low pressure value. It also uses a temperature sensor installed on the outdoor heat exchanger to collect the current refrigerant temperature in the outdoor heat exchanger.

[0170] Next, the second processing module 32 determines the current control mode based on the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value.

[0171] Then, the second processing module 32 uses the first control method in the current control mode to control the target operating frequency of the compressor, and uses the second control method in the current control mode to control the target operating frequencies of the first fan and the second fan.

[0172] This disclosure effectively ensures heating comfort while controlling drainage by adjusting the target operating frequency of the compressor and the target operating frequencies of the first and second fans in the outdoor unit.

[0173] I. First Control Mode

[0174] When the current outdoor ambient temperature, current refrigerant temperature, and current system low pressure value meet the first condition, the second processing module 32 determines the current control mode as the first control mode. The first condition includes: the current outdoor ambient temperature is within a first temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, and the saturation temperature corresponding to the current system low pressure is not less than a third temperature threshold.

[0175] For example, the first temperature range is [15℃, 50℃), and the third temperature threshold is 10℃.

[0176] The first control method in the first control mode controls the target operating frequency of the compressor based on the compressor's current operating frequency, the current system high pressure value, and the target high pressure value.

[0177] For example, if the current system high pressure value is greater than the target high pressure value, the difference between the current system high pressure value and the target high pressure value is calculated as the first difference value. The product of the first difference value, the first frequency conversion coefficient and the first correction coefficient is calculated to obtain the first parameter. The difference between the current operating frequency of the compressor and the first parameter is calculated to obtain the target operating frequency of the compressor.

[0178] For example, if the current system high pressure value is less than the target high pressure value, the difference between the target high pressure value and the current system high pressure value is calculated as the second difference value. The product of the second difference value, the second frequency conversion coefficient, and the second correction coefficient is calculated to obtain the second parameter. The sum of the current operating frequency of the compressor and the second parameter is calculated to obtain the target operating frequency of the compressor.

[0179] The second control method in the first control mode controls the target operating frequency of the first fan based on the current operating frequency of the first fan, the current system low pressure value, and the target low pressure value, and controls the target operating frequency of the second fan based on the current operating frequency of the second fan, the current system low pressure value, and the target low pressure value.

[0180] For example, if the current system low pressure value is greater than the target low pressure value, the difference between the current system low pressure value and the target low pressure value is calculated as the third difference value. The product of the third difference value and the third frequency conversion coefficient is calculated to obtain the third parameter. The difference between the current operating frequency of the first fan and the third parameter is calculated to obtain the target operating frequency of the first fan. The difference between the current operating frequency of the second fan and the third parameter is calculated to obtain the target operating frequency of the second fan.

[0181] For example, if the current system low pressure value is less than the target low pressure value, the difference between the target low pressure value and the current system low pressure value is calculated as the fourth difference value. The product of the fourth difference value and the fourth frequency conversion coefficient is calculated to obtain the fourth parameter. The sum of the current operating frequency of the first fan and the fourth parameter is calculated to obtain the target operating frequency of the first fan. The sum of the current operating frequency of the second fan and the fourth parameter is calculated to obtain the target operating frequency of the second fan.

[0182] It should be noted that in the first control mode described above, due to the high outdoor ambient temperature, the condensate formation rate is low. In this situation, the compressor, first fan, and second fan operate at a higher frequency. The reverse suction generated by the fan operation does not significantly affect rapid drainage. This achieves a balance between the condensate formation rate, the reverse suction generated by the fan operation, and heating comfort, effectively ensuring a good user experience while achieving rapid drainage.

[0183] In some embodiments, when the multi-split air conditioner is in the first control mode, if the conditions of other control modes are met, the second processing module 32 controls the multi-split air conditioner to exit the first control mode and enter another control mode. For example, the present invention will also describe a second control mode, a third control mode, a fourth control mode, and a fifth control mode. For example, when the multi-split air conditioner is in the first control mode, if the conditions of the second control mode are met, the multi-split air conditioner will exit the first control mode and enter the second control mode.

[0184] II. Second Control Mode

[0185] When the current outdoor ambient temperature, current refrigerant temperature, and current system low pressure value meet the second condition, the second processing module 32 determines the current control mode as the second control mode. The second condition includes: the current outdoor ambient temperature is within the second temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, the saturation temperature corresponding to the current system low pressure is not less than the fourth temperature threshold, the upper limit of the second temperature range is the lower limit of the first temperature range, and the fourth temperature threshold is less than the third temperature threshold.

[0186] The first control method in the second control mode controls the compressor's target operating frequency based on the compressor's current operating frequency, the current system high pressure value, and the target high pressure value.

[0187] It should be noted that the first control method in the second control mode is the same as the first control method in the first control mode described above. Therefore, for the sake of simplicity, it will not be described in detail here.

[0188] The second control method of the second control mode includes:

[0189] 1) When the system low pressure value is greater than the target low pressure value, the target operating frequency of the first fan is controlled according to the current operating frequency of the first fan and the first control parameter, and the target operating frequency of the second fan is controlled according to the current operating frequency of the second fan and the second control parameter, wherein the first control parameter and the second control parameter are negative numbers not greater than -1.

[0190] 2) When the system low pressure value is not greater than the target low pressure value, the current operating frequency of the first fan is taken as the target operating frequency of the first fan, and the current operating frequency of the second fan is taken as the target operating frequency of the second fan.

[0191] It's important to note that the outdoor ambient temperature is lower in the second control mode compared to the first, leading to an increased condensate formation rate. In this situation, if the first and second fans are operated at a higher frequency under the first control mode, the reverse suction generated by the fans would hinder rapid drainage. Therefore, in the second control mode, while controlling the compressor, first fan, and second fan to operate at a higher frequency, the first and second fans are controlled to rotate clockwise for a period of time, then counter-clockwise for the next period, and then clockwise again for the following period. This intermittent change in the direction of the first and second fans reduces the reverse suction generated by the fans. This achieves a balance between the condensate formation rate, the reverse suction generated by the fans, and heating comfort, effectively improving the user experience while accelerating drainage.

[0192] In some embodiments, when the multi-split air conditioner is in the second control mode, the second control mode is exited when any of the following conditions are met: the duration for which the system low pressure value is not greater than the target low pressure value is greater than the second duration (e.g., 5 seconds); the duration for which the change in the system high pressure value is greater than the first change threshold (e.g., 10%) is greater than the second duration; or the continuous running time in the second control mode is greater than the third duration (e.g., 60 seconds).

[0193] III. Third Control Mode

[0194] When the current outdoor ambient temperature, current refrigerant temperature, and current system low pressure value meet the third condition, the second processing module 32 determines the current control mode as the third control mode. The third condition includes: the current outdoor ambient temperature is within the third temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, the saturation temperature corresponding to the current system low pressure is not less than the fifth temperature threshold, the upper limit of the third temperature range is the lower limit of the second temperature range, and the fifth temperature threshold is less than the fourth temperature threshold.

[0195] The first control method in the third control mode controls the compressor's target operating frequency based on the compressor's current operating frequency, the current system high pressure value, and the target high pressure value.

[0196] It should be noted that the first control method in the third control mode is the same as the first control method in the first control mode described above. Therefore, for the sake of simplicity, it will not be described in detail here.

[0197] The second control method of the third control mode includes:

[0198] When the system low pressure value is greater than the target low pressure value, the current operating frequency of the first fan is taken as the target operating frequency of the first fan. The target operating frequency of the second fan is controlled according to the current operating frequency of the second fan and the third control parameter, where the third control parameter is a negative number not greater than -1.

[0199] When the system low pressure value is not greater than the target low pressure value, the current operating frequency of the first fan is taken as the target operating frequency of the first fan, and the current operating frequency of the second fan is taken as the target operating frequency of the second fan.

[0200] It's important to note that the outdoor ambient temperature in the third control mode is further reduced compared to the second mode, leading to a further increase in condensate formation. In this situation, if the first and second fans are controlled according to the second mode, the reverse suction generated by the fans will still affect rapid drainage. Therefore, in the third control mode, while controlling the compressor and second fan to operate at a higher frequency and the first fan to operate at a lower frequency, the rotation direction of the first fan remains constant, and the second fan rotates forward for a period of time, then reverses for the next period, and then rotates forward again. This intermittent change in the direction of the second fan reduces the reverse suction generated by the fans. This achieves a balance between the condensate formation rate, the reverse suction generated by the fans, and heating comfort, effectively improving the user experience while accelerating drainage.

[0201] In some embodiments, when the multi-split air conditioner is in the third control mode, it exits the third control mode if any of the following conditions are met: the duration for which the system low pressure value is not greater than the target low pressure value is greater than a fourth duration (e.g., 5 seconds); the duration for which the change in the system high pressure value is greater than a second change threshold (e.g., 10%) is greater than a fourth duration; or the duration of continuous operation in the third control mode is greater than a fifth duration (e.g., 60 seconds).

[0202] IV. Fourth Control Mode

[0203] When the current outdoor ambient temperature, current refrigerant temperature, and current system low pressure value meet the fourth condition, the second processing module 32 determines the current control mode as the fourth control mode. The fourth condition includes: the current outdoor ambient temperature is within the fourth temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, the saturation temperature corresponding to the current system low pressure is not less than the sixth temperature threshold, the upper limit of the fourth temperature range is the lower limit of the third temperature range, and the sixth temperature threshold is less than the fifth temperature threshold.

[0204] The first control method of the fourth control mode includes:

[0205] 1) When the system high pressure value is greater than the target high pressure value, the target operating frequency of the compressor is controlled according to the current operating frequency of the compressor and the fourth control parameter, wherein the fourth control parameter is a positive number not greater than 1.

[0206] 2) When the system high pressure value is not greater than the target high pressure value, the current operating frequency of the compressor is taken as the target operating frequency of the compressor.

[0207] The second control method of the fourth control mode includes:

[0208] 1) When the system low pressure value is greater than the target low pressure value, the target operating frequency of the first fan is controlled according to the current operating frequency of the first fan and the fifth control parameter, and the target operating frequency of the second fan is controlled according to the current operating frequency of the second fan and the fifth control parameter, wherein the fifth control parameter is a positive number less than 1.

[0209] 2) When the system low pressure value is not greater than the target low pressure value, the current operating frequency of the first fan is taken as the target operating frequency of the first fan, and the current operating frequency of the second fan is taken as the target operating frequency of the second fan.

[0210] It's important to note that compared to the third control mode, the fourth control mode corresponds to a further decrease in outdoor ambient temperature, leading to a further increase in the condensate formation rate. In this situation, if the first and second fans are controlled according to the third control mode, the reverse suction generated by the fan operation will still affect rapid drainage. Therefore, in the fourth control mode, the compressor, first fan, and second fan are controlled to operate at a lower frequency, thereby reducing the reverse suction generated by the fan operation. This achieves a balance between the condensate formation rate, the reverse suction generated by the fan operation, and heating comfort, effectively improving the user experience while accelerating drainage.

[0211] In some embodiments, when the multi-split air conditioner is in the fourth control mode, it exits the fourth control mode if any of the following conditions are met: the duration for which the system low pressure value is not greater than the target low pressure value is greater than the sixth duration (e.g., 5 seconds); the duration for which the change in the system high pressure value is greater than the third change threshold (e.g., 8%) is greater than the sixth duration; or the continuous running time in the fourth control mode is greater than the seventh duration (e.g., 60 seconds).

[0212] V. Fifth Control Mode

[0213] When the outdoor unit of the air conditioner enters defrost mode, the second processing module 32 acquires the current refrigerant temperature in the outdoor heat exchanger at a preset frequency. If the current refrigerant temperature meets a fifth condition, the current control mode is determined to be the fifth control mode. The fifth condition includes: the current refrigerant temperature is not less than a preset defrost threshold.

[0214] Next, the target operating frequency of the compressor is controlled by the first control method in the fifth control mode, and the target operating frequencies of the first and second fans are controlled by the second control method in the fifth control mode.

[0215] In some embodiments, the first control method in the fifth control mode controls the target operating frequency of the compressor based on the current operating frequency of the compressor and the sixth control parameter, wherein the sixth control parameter is a positive number not less than 1.

[0216] In some embodiments, the second control method in the fifth control mode includes: controlling the target operating frequency of the first fan according to the current operating frequency of the first fan and a seventh control parameter, wherein the seventh control parameter is a negative number not greater than -1. The target operating frequency of the second fan is controlled according to the current operating frequency of the second fan and the seventh control parameter. Furthermore, the target operating frequency of the first fan does not exceed the physical frequency limit of the first fan, and the target operating frequency of the second fan does not exceed the physical frequency limit of the second fan.

[0217] It's important to note that when the outdoor unit is in defrost mode, the outdoor heat exchanger switches from evaporator to condenser, using high temperatures to remove frost or ice. However, the indoor heat exchanger also switches to evaporator during this time. In this situation, if the first and second fans operate, the indoor temperature will drop; if they stop, it hinders rapid drainage. Therefore, in the fifth control mode, while controlling the compressor, first fan, and second fan to operate at a higher frequency, the first and second fans are controlled to rotate forward for a period of time, then reverse for the next period, and then forward again for the following period. By intermittently changing the direction of the first and second fans, the reverse suction generated by the fans is reduced, preventing a drop in indoor temperature. This achieves a balance between the rate of condensate formation, the reverse suction generated by the fans, and heating comfort, accelerating drainage while effectively improving the user experience.

[0218] In some embodiments, when in the fifth control mode, the fifth control mode is exited when the outdoor unit of the air conditioner exits the defrosting mode.

[0219] It's important to note that entering the fifth control mode requires the outdoor unit to be in defrost mode. If the outdoor unit exits defrost mode, the outdoor heat exchanger will no longer function as a high-temperature heat source, and the fifth control mode will no longer be applicable. After exiting the fifth control mode, you can enter the first, second, third, or fourth control modes mentioned above, depending on the specific situation, to achieve a balance between the condensate generation rate, the reverse suction generated by the fan, and heating comfort, thus accelerating drainage while effectively ensuring heating comfort.

[0220] In the multi-split air conditioning control device provided in the above embodiments of this disclosure, by controlling the target operating frequency of the compressor and the target operating frequencies of the first and second fans in the outdoor unit, a balance can be achieved between the condensate generation rate, the reverse suction generated by the fan operation, and the heating comfort, thereby accelerating drainage while effectively ensuring heating comfort.

[0221] Figure 4This is a schematic diagram of the structure of a multi-split air conditioning control device according to another embodiment of this disclosure. Figure 4 As shown, the multi-split air conditioning control device includes a memory 41 and a processor 42.

[0222] Memory 41 is used to store instructions, and processor 42 is coupled to memory 41. Processor 42 is configured to execute instructions based on the memory storage, as shown in the example. Figure 1-2 The method involved in any of the embodiments.

[0223] like Figure 4 As shown, the multi-split air conditioning control device also includes a communication interface 43 for exchanging information with other devices. Additionally, the multi-split air conditioning control device includes a bus 44, through which the processor 42, communication interface 43, and memory 41 communicate with each other.

[0224] The memory 41 may include high-speed RAM, and may also include non-volatile memory, such as at least one disk storage device. The memory 41 may also be a memory array. The memory 41 may also be divided into blocks, and the blocks may be combined into virtual volumes according to certain rules.

[0225] Furthermore, processor 42 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present disclosure.

[0226] This disclosure also relates to a computer-readable storage medium storing computer instructions that, when executed by a processor, implement... Figure 1-2 The method involved in any of the embodiments.

[0227] Figure 5 This is a schematic diagram of the structure of a multi-split air conditioner according to an embodiment of this disclosure. Figure 5 As shown, the multi-split air conditioner includes a multi-split air conditioner control device 51, a first pressure sensor 52, and a first temperature sensor 53. The multi-split air conditioner control device 51 is... Figure 3 or Figure 4 The multi-split air conditioning control device involved in any of the embodiments.

[0228] The first pressure sensor 52 is configured to detect the system high pressure value in the compressor exhaust line and send the system high pressure value to the multi-split air conditioning control unit 51.

[0229] The first temperature sensor 53 is configured to detect the outdoor ambient temperature value and send the outdoor ambient temperature value to the multi-split air conditioning control unit 51.

[0230] In some embodiments, such as Figure 5As shown, the multi-split air conditioner also includes a second pressure sensor 54 and a second temperature sensor 55.

[0231] The second pressure sensor 54 is configured to detect the system low pressure value in the compressor suction line and send the system low pressure value to the multi-split air conditioning control unit 51.

[0232] The second temperature sensor 55 is configured to detect the refrigerant temperature in the outdoor heat exchanger and send the refrigerant temperature to the multi-split air conditioning control unit 51.

[0233] Figure 6 This is a schematic diagram of the structure of an outdoor unit of a multi-split air conditioner according to an embodiment of this disclosure. Figure 6 As shown, the outdoor unit of a multi-split air conditioner includes a first fan 61, a second fan 62, a heat exchanger 63, a controller 64, a first temperature sensor 65 for detecting the outdoor ambient temperature, a second temperature sensor 66 for detecting the refrigerant temperature in the heat exchanger 63, and a pressure sensor 67 for detecting the low-pressure value of the system in the compressor suction line. It should be noted that... Figure 6 The pressure sensor used to detect the system high pressure value in the compressor exhaust line is not shown.

[0234] This disclosure achieves a balance between the condensate generation rate, the reverse suction generated by the fan operation, and the heating comfort by controlling the target operating frequency of the compressor and the target operating frequencies of the first and second fans in the outdoor unit, thereby accelerating drainage while effectively ensuring heating comfort.

[0235] In some embodiments, the functional units described above may be implemented as general-purpose processors, programmable logic controllers (PLCs), digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described herein.

[0236] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0237] The description in this disclosure is provided for illustrative and descriptive purposes only and is not intended to be exhaustive or to limit the disclosure to its forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of this disclosure and to enable those skilled in the art to understand this disclosure and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A method for controlling a multi-split air conditioning system, comprising: When the multi-split air conditioner is in heating mode and the heating duration is not less than the first duration, the current system high pressure value and the current outdoor ambient temperature are obtained at a preset frequency. When the saturation temperature corresponding to the current system high pressure value is not less than the first temperature threshold and the current outdoor ambient temperature is not less than the second temperature threshold, control the target operating frequency of the compressor, the first fan and the second fan. The target operating frequencies for controlling the compressor, the first fan, and the second fan include: When the outdoor unit of the air conditioner is not in defrost mode, the current refrigerant temperature in the outdoor heat exchanger and the current system low pressure value are obtained at a preset frequency. The current control mode is determined based on the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value; The target operating frequency of the compressor is controlled using the first control method in the current control mode, and the target operating frequencies of the first fan and the second fan are controlled using the second control method in the current control mode. Determining the current control mode includes: When the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value meet a first condition, the current control mode is determined to be a first control mode. In the first control mode, the first control method controls the target operating frequency of the compressor based on the current operating frequency of the compressor, the current system high pressure value, and the target high pressure value. In the first control mode, the second control method controls the target operating frequency of the first fan based on the current operating frequency of the first fan, the current system low pressure value, and the target low pressure value, and controls the target operating frequency of the second fan based on the current operating frequency of the second fan, the current system low pressure value, and the target low pressure value. The first condition includes: the current outdoor ambient temperature is within a first temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, and the saturation temperature corresponding to the current system low pressure is not less than a third temperature threshold.

2. The method according to claim 1, wherein, Controlling the target operating frequency of the compressor includes: If the current system high voltage value is greater than the target high voltage value, the difference between the current system high voltage value and the target high voltage value is calculated as the first difference value; The first parameter is obtained by multiplying the first difference, the first frequency conversion coefficient, and the first correction coefficient. The difference between the current operating frequency of the compressor and the first parameter is calculated to obtain the target operating frequency of the compressor.

3. The method according to claim 2, wherein, Controlling the target operating frequency of the compressor includes: If the current system high voltage value is less than the target high voltage value, the difference between the target high voltage value and the current system high voltage value is calculated as a second difference value; The second parameter is obtained by multiplying the second difference, the second frequency conversion coefficient, and the second correction coefficient. The current operating frequency of the compressor is calculated as the sum of the second parameter to obtain the target operating frequency of the compressor.

4. The method according to claim 1, wherein, Controlling the target operating frequency of the first fan and the second fan includes: If the current system low pressure value is greater than the target low pressure value, the difference between the current system low pressure value and the target low pressure value is calculated as a third difference value; The third parameter is obtained by multiplying the third difference and the third frequency conversion coefficient. Calculate the difference between the current operating frequency of the first fan and the third parameter to obtain the target operating frequency of the first fan; The difference between the current operating frequency of the second fan and the third parameter is calculated to obtain the target operating frequency of the second fan.

5. The method according to claim 4, wherein, Determining the target operating frequencies of the first and second wind turbines includes: If the current system low pressure value is less than the target low pressure value, the difference between the target low pressure value and the current system low pressure value is calculated as a fourth difference value; The fourth parameter is obtained by multiplying the fourth difference and the fourth frequency conversion coefficient. The current operating frequency of the first fan is calculated and the sum of the fourth parameter is obtained to obtain the target operating frequency of the first fan. The current operating frequency of the second fan is calculated as the sum of the fourth parameter to obtain the target operating frequency of the second fan.

6. The method according to claim 1, wherein, Determining the current control mode includes: When the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value meet the second condition, the current control mode is determined to be the second control mode; The second condition includes: the current outdoor ambient temperature is within a second temperature range; the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature; the saturation temperature corresponding to the current system low pressure is not less than a fourth temperature threshold; the upper limit of the second temperature range is the lower limit of the first temperature range; and the fourth temperature threshold is less than the third temperature threshold.

7. The method according to claim 6, wherein, The first control method in the second control mode controls the target operating frequency of the compressor based on the compressor's current operating frequency, the current system high pressure value, and the target high pressure value.

8. The method according to claim 6, wherein, The second control method of the second control mode includes: When the system low pressure value is greater than the target low pressure value, the target operating frequency of the first fan is controlled according to the current operating frequency of the first fan and the first control parameter, and the target operating frequency of the second fan is controlled according to the current operating frequency of the second fan and the second control parameter, wherein the first control parameter and the second control parameter are negative numbers not greater than -1; When the system low pressure value is not greater than the target low pressure value, the current operating frequency of the first fan is taken as the target operating frequency of the first fan, and the current operating frequency of the second fan is taken as the target operating frequency of the second fan.

9. The method according to claim 8, wherein, Controlling the target operating frequency of the first fan and the target operating frequency of the second fan includes: If the system low pressure value is greater than the target low pressure value, the target operating frequency of the first fan is determined based on the product of the current operating frequency of the first fan and the first control parameter. After the first fan has been running for a predetermined period of time according to its target operating frequency, the target operating frequency of the second fan is determined by the product of the current operating frequency of the second fan and the second control parameter.

10. The method according to claim 6, wherein, When in the second control mode, the system exits the second control mode if any of the following conditions are met: the duration for which the system low pressure value is not greater than the target low pressure value is greater than the second duration; the duration for which the change in the system high pressure value is greater than the first change threshold is greater than the second duration; or the duration of continuous operation in the second control mode is greater than the third duration.

11. The method according to claim 6, wherein, Determining the current control mode includes: When the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value meet the third condition, the current control mode is determined to be the third control mode; The third condition includes: the current outdoor ambient temperature is within a third temperature range; the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature; the saturation temperature corresponding to the current system low pressure is not less than a fifth temperature threshold; the upper limit of the third temperature range is the lower limit of the second temperature range; and the fifth temperature threshold is less than the fourth temperature threshold.

12. The method according to claim 11, wherein, The first control method in the third control mode controls the target operating frequency of the compressor based on the compressor's current operating frequency, the current system high pressure value, and the target high pressure value.

13. The method according to claim 11, wherein, The second control method of the third control mode includes: When the system low pressure value is greater than the target low pressure value, the current operating frequency of the first fan is taken as the target operating frequency of the first fan, and the target operating frequency of the second fan is controlled according to the current operating frequency of the second fan and the third control parameter, wherein the third control parameter is a negative number not greater than -1; When the system low pressure value is not greater than the target low pressure value, the current operating frequency of the first fan is taken as the target operating frequency of the first fan, and the current operating frequency of the second fan is taken as the target operating frequency of the second fan.

14. The method according to claim 13, wherein, When the system low pressure value is greater than the target low pressure value, the target operating frequency of the second fan is the product of the current operating frequency of the second fan and the third control parameter.

15. The method according to claim 11, wherein, When in the third control mode, the system shall exit the third control mode if any of the following conditions are met: the duration for which the system low pressure value is not greater than the target low pressure value is greater than a fourth duration; the duration for which the change in the system high pressure value is greater than the second change threshold is greater than the fourth duration; or the duration of continuous operation in the third control mode is greater than a fifth duration.

16. The method according to claim 11, wherein, Determining the current control mode includes: When the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value meet the fourth condition, the current control mode is determined to be the fourth control mode. The fourth condition includes: the current outdoor ambient temperature is within the fourth temperature range; the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature; the saturation temperature corresponding to the current system low pressure is not less than the sixth temperature threshold; the upper limit of the fourth temperature range is the lower limit of the third temperature range; and the sixth temperature threshold is less than the fifth temperature threshold.

17. The method according to claim 16, wherein, The first control method of the fourth control mode includes: When the system high pressure value is greater than the target high pressure value, the target operating frequency of the compressor is controlled according to the current operating frequency of the compressor and the fourth control parameter, wherein the fourth control parameter is a positive number not greater than 1; When the system high pressure value is not greater than the target high pressure value, the current operating frequency of the compressor is taken as the target operating frequency of the compressor.

18. The method according to claim 17, wherein, When the system low pressure value is greater than the target low pressure value, the target operating frequency of the compressor is the product of the compressor's current operating frequency and the fourth control parameter.

19. The method of claim 16, wherein, The second control method of the fourth control mode includes: When the system low pressure value is greater than the target low pressure value, the target operating frequency of the first fan is controlled according to the current operating frequency of the first fan and the fifth control parameter, and the target operating frequency of the second fan is controlled according to the current operating frequency of the second fan and the fifth control parameter, wherein the fifth control parameter is a positive number less than 1; When the system low pressure value is not greater than the target low pressure value, the current operating frequency of the first fan is taken as the target operating frequency of the first fan, and the current operating frequency of the second fan is taken as the target operating frequency of the second fan.

20. The method according to claim 19, wherein, When the system low pressure value is greater than the target low pressure value, the target operating frequency of the first fan is the product of the current operating frequency of the first fan and the fifth control parameter, and the target operating frequency of the second fan is the product of the current operating frequency of the second fan and the fifth control parameter.

21. The method according to claim 16, wherein, When in the fourth control mode, the fourth control mode shall be exited if any of the following conditions are met: the duration for which the system low pressure value is not greater than the target low pressure value is greater than the sixth duration; the duration for which the change in the system high pressure value is greater than the third change threshold is greater than the sixth duration; or the duration of continuous operation in the fourth control mode is greater than the seventh duration.

22. The method according to any one of claims 1-21, wherein, When the outdoor unit of the air conditioner enters defrosting mode, the current refrigerant temperature in the outdoor heat exchanger is obtained at a preset frequency; When the current refrigerant temperature meets the fifth condition, the current control mode is determined to be the fifth control mode, wherein the fifth condition includes: the current refrigerant temperature is not less than the preset defrost threshold; The target operating frequency of the compressor is controlled by the first control method in the fifth control mode, and the target operating frequencies of the first fan and the second fan are controlled by the second control method in the fifth control mode.

23. The method according to claim 22, wherein, The first control method in the fifth control mode controls the target operating frequency of the compressor based on the compressor's current operating frequency and a sixth control parameter, wherein the sixth control parameter is a positive number not less than 1.

24. The method according to claim 23, wherein, The target operating frequency of the compressor is the product of the compressor's current operating frequency and the sixth control parameter.

25. The method according to claim 22, wherein, The second control method in the fifth control mode includes: The target operating frequency of the first fan is controlled according to the current operating frequency of the first fan and the seventh control parameter, wherein the seventh control parameter is a negative number not greater than -1; The target operating frequency of the second fan is controlled according to the current operating frequency of the second fan and the seventh control parameter.

26. The method of claim 25, wherein, The target operating frequency of the first fan is the product of the current operating frequency of the first fan and the seventh control parameter; The target operating frequency of the second fan is the product of the current operating frequency of the second fan and the seventh control parameter.

27. The method according to claim 22, wherein, When in the fifth control mode, exit the fifth control mode when the outdoor unit of the air conditioner exits the defrosting mode.

28. A multi-split air conditioning control device, comprising: The first processing module is configured to acquire the current system high pressure value and the current outdoor ambient temperature at a preset frequency when the multi-split air conditioner is in heating mode and the heating duration is not less than the first duration. The second processing module is configured to control the target operating frequency of the compressor, the first fan and the second fan when the saturation temperature corresponding to the current system high pressure value is not less than a first temperature threshold and the current outdoor ambient temperature is not less than a second temperature threshold. When the outdoor unit of the air conditioner has not entered the defrosting mode, the current refrigerant temperature in the outdoor heat exchanger and the current system low pressure value are obtained at a preset frequency. The current control mode is determined based on the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value. When the current outdoor ambient temperature, the current refrigerant temperature, and the current system low pressure value meet a first condition, the current control mode is determined to be the first control mode. The first control method in the first control mode controls the target operating frequency of the compressor based on the current operating frequency of the compressor, the current system high pressure value, and the target high pressure value. The second control method in the first control mode controls the target operating frequency of the first fan based on the current operating frequency of the first fan, the current system low pressure value, and the target low pressure value, and controls the target operating frequency of the second fan based on the current operating frequency of the second fan, the current system low pressure value, and the target low pressure value. The first condition includes: the current outdoor ambient temperature is within a first temperature range, the current refrigerant temperature is not less than the dew point temperature corresponding to the current outdoor ambient temperature, and the saturation temperature corresponding to the current system low pressure is not less than a third temperature threshold. The target operating frequency of the compressor is controlled using the first control method in the current control mode, and the target operating frequencies of the first fan and the second fan are controlled using the second control method in the current control mode.

29. A multi-split air conditioning control device, comprising: The memory is configured to store instructions; A processor, coupled to a memory, configured to implement the method as described in any one of claims 1-27 based on memory-stored instruction execution.

30. A multi-split air conditioner, comprising: The multi-split air conditioning control device as described in claim 28 or 29; The first pressure sensor is configured to detect the system high pressure value in the compressor exhaust pipe and send the system high pressure value to the multi-split air conditioning control device; The first temperature sensor is configured to detect the outdoor ambient temperature value and send the outdoor ambient temperature value to the multi-split air conditioning control device.

31. The multi-split air conditioner according to claim 30, further comprising: The second pressure sensor is configured to detect the system low pressure value in the compressor suction line and send the system low pressure value to the multi-split air conditioning control device. The second temperature sensor is configured to detect the refrigerant temperature in the outdoor heat exchanger and send the refrigerant temperature to the multi-split air conditioning control unit.

32. A computer-readable storage medium, wherein, A computer-readable storage medium stores computer instructions that, when executed by a processor, implement the method as described in any one of claims 1-27.

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