Method and device for controlling a multi-split air conditioner, and multi-split air conditioner

Abstract

The application relates to the air conditioning technical field, and discloses a method and device for controlling a multi-connected air conditioner and the multi-connected air conditioner. The method determines the single-machine load of each indoor unit according to the temperature difference between the actual temperature and the set temperature, further determines the total-machine load of all the indoor units, and controls the operation of the outdoor unit based on the total-machine load. The temperature difference of each indoor unit can accurately reflect the current state of the indoor unit, so that the single-machine load calculated based on the temperature difference is more accurate, and compared with the method of simply relying on the pre-set target pressure to control the outdoor unit, the method of the application embodiment can effectively improve the control accuracy of the outdoor unit.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, for example to a method, apparatus and multi-split air conditioner for controlling a multi-split air conditioner. Background Technology

[0002] In a multi-split air conditioning system, the outdoor unit compressor capacity control method usually involves setting a target low-pressure PsTar (or the corresponding saturation temperature PsTempTar) for cooling and a target high-pressure PdTar (or the corresponding saturation temperature PdTempTar) for heating. The difference between the target value and the actual value is compared to determine the indoor unit load, and then the compressor frequency is adjusted to achieve the target pressure.

[0003] In the process of implementing the embodiments of this application, at least the following problems were found in the related technology:

[0004] The indoor unit load calculated in related technologies is often not accurate enough, resulting in insufficient sensitivity of the outdoor unit control and hindering the rapid achievement of the expected air conditioning effect.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This application provides a method, apparatus, and multi-split air conditioner for controlling a multi-split air conditioner, so as to improve the control accuracy of the outdoor unit of the air conditioner.

[0008] In some embodiments, the method is applied to a multi-split air conditioner including an outdoor unit and multiple indoor units connected to the outdoor unit; the method includes: obtaining the temperature difference between the actual temperature and a set temperature of each indoor unit; determining the individual load of the indoor unit corresponding to each temperature difference; determining the total load of the indoor units of the multi-split air conditioner based on the individual load of the indoor units; and controlling the operation of the outdoor unit based on the total load of the indoor units.

[0009] Optionally, determining the indoor unit load corresponding to each temperature difference includes: determining the temperature difference range in which the temperature difference is located; determining the target correspondence between the indoor unit load and the temperature difference based on the temperature difference range in which the temperature difference is located; and determining the indoor unit load corresponding to each temperature difference based on the target correspondence.

[0010] Optionally, based on the temperature difference range, the target correspondence between the indoor unit's single-unit load and the temperature difference is determined, including: when the temperature difference range is a first temperature difference range, the target correspondence is determined to be a quadratic curve relationship; when the temperature difference range is a second temperature difference range, the target correspondence is determined to be a linear relationship; when the temperature difference range is a third temperature difference range, the target correspondence is determined to be a constant value relationship; and when the temperature difference range is a fourth temperature difference range, the target correspondence is determined to be a linear relationship. Wherein, the lower limit threshold of the first temperature difference range is greater than or equal to the upper limit threshold of the second temperature difference range, the lower limit threshold of the second temperature difference range is greater than or equal to the upper limit threshold of the third temperature difference range, and the lower limit threshold of the third temperature difference range is greater than or equal to the upper limit threshold of the fourth temperature difference range.

[0011] Optionally, the target correspondence is determined as a quadratic curve relationship, including: determining a quadratic function based on the square of the temperature difference, the temperature difference, and the capacity of the indoor unit; and determining the quadratic function as the target correspondence.

[0012] Optionally, determining the target correspondence function as a linear relationship includes: determining a linear function based on the temperature difference and the capacity of the indoor unit; and determining the linear function as the target correspondence.

[0013] Optionally, the total indoor unit load of the multi-split air conditioner is determined based on the individual indoor unit load, including: determining the weight value of the individual indoor unit load corresponding to each temperature difference; and determining the total indoor unit load based on the individual indoor unit load and the weight value of the individual indoor unit load.

[0014] Optionally, controlling the operation of the outdoor unit based on the load of the indoor unit's main unit includes: determining the range of the indoor unit's main unit load where the indoor unit's main unit load is located; and adjusting the operating frequency of the outdoor unit according to the range of the indoor unit's main unit load where the indoor unit's main unit load is located.

[0015] Optionally, the operating frequency of the outdoor unit is adjusted according to the indoor unit load range in which the indoor unit load falls, including: increasing the operating frequency of the outdoor unit when the indoor unit load range is a first indoor unit load range; maintaining the operating frequency of the outdoor unit when the indoor unit load range is a second indoor unit load range; and decreasing the operating frequency of the outdoor unit when the indoor unit load range is a third indoor unit load range; wherein the upper limit threshold of the first indoor unit load is less than or equal to the lower limit threshold of the second indoor unit load, and the upper limit threshold of the second indoor unit load is less than or equal to the lower limit threshold of the third indoor unit load.

[0016] Optionally, the upper limit threshold of the total load of the first indoor unit is equal to the lower limit threshold of the total load of the second indoor unit, and the upper limit threshold of the total load of the second indoor unit is equal to the lower limit threshold of the total load of the third indoor unit.

[0017] Optionally, controlling the operation of the outdoor unit based on the load of the indoor unit main unit further includes: adjusting the opening degree of the expansion valve corresponding to each indoor unit when the load range of the indoor unit main unit is within the second load range of the indoor unit main unit.

[0018] Optionally, adjusting the opening of the expansion valve corresponding to each indoor unit includes: determining the temperature difference range of each indoor unit; determining a target adjustment strategy corresponding to the temperature difference based on the temperature difference range of each indoor unit; and adjusting the expansion valve of the indoor unit according to the target adjustment strategy.

[0019] Optionally, determining the target adjustment strategy corresponding to the temperature difference includes: when the temperature difference is less than a first temperature difference threshold, determining the target adjustment strategy as reducing the opening; when the temperature difference is greater than or equal to the first temperature difference threshold and less than a second temperature difference threshold, determining the target adjustment strategy as a maintenance strategy; when the temperature difference is greater than or equal to the second temperature difference threshold, determining the target adjustment strategy as an automatic adjustment strategy; wherein the first temperature difference threshold is less than the second temperature difference threshold.

[0020] Optionally, it also includes: adjusting the rate at which the opening decreases based on the temperature difference when the temperature difference is less than a first temperature difference threshold.

[0021] Optionally, the speed at which the opening degree decreases is adjusted based on the temperature difference includes: if the temperature difference of the indoor unit is less than 3, the opening degree is decreased at a first speed; or, if the temperature difference of the indoor unit is between 3 and 0, the opening degree is decreased at a second speed; wherein the first speed is less than the second speed.

[0022] In some embodiments, the apparatus includes a processor and a memory storing program instructions, wherein the processor is configured to execute the above-described method for controlling a multi-split air conditioner when executing the program instructions.

[0023] In some embodiments, the multi-split air conditioner includes: an outdoor unit; a plurality of indoor units connected to the outdoor unit; and the aforementioned device for controlling the multi-split air conditioner is installed on the outdoor unit or an indoor unit.

[0024] The method, apparatus, and multi-split air conditioner for controlling a multi-split air conditioner provided in this application can achieve the following technical effects:

[0025] The method provided in this application determines the individual load of each indoor unit based on the temperature difference between the actual temperature and the set temperature, thereby determining the total load of all indoor units, and controlling the operation of the outdoor unit based on the total load. The temperature difference of each indoor unit accurately reflects its current state; therefore, the individual load calculated based on the temperature difference is more accurate. Compared to simply relying on a pre-set target pressure for outdoor unit control, the method in this application can effectively improve the control accuracy of the outdoor unit.

[0026] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0027] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0028] Figure 1 This is a schematic diagram of the hardware environment for a method of controlling a multi-split air conditioner according to an embodiment of this application;

[0029] Figure 2 A schematic diagram illustrating a method for controlling a multi-split air conditioner, provided as an embodiment of this application;

[0030] Figure 3 A schematic diagram illustrating another method for controlling a multi-split air conditioner provided in an embodiment of this application;

[0031] Figure 4 A schematic diagram illustrating yet another method for controlling a multi-split air conditioner provided in an embodiment of this application;

[0032] Figure 5 A schematic diagram illustrating another method for controlling a multi-split air conditioner provided in an embodiment of this application;

[0033] Figure 6 A schematic diagram illustrating another method for controlling a multi-split air conditioner provided in an embodiment of this application;

[0034] Figure 7 A schematic diagram illustrating another method for controlling a multi-split air conditioner provided in an embodiment of this application;

[0035] Figure 8 A schematic diagram of a device for controlling a multi-split air conditioner provided in an embodiment of this application;

[0036] Figure 9 This is a schematic diagram of a multi-split air conditioner provided in an embodiment of this application. Detailed Implementation

[0037] To provide a more detailed understanding of the features and technical content of the embodiments of this application, the implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this application. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0038] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0039] Unless otherwise stated, the term "multiple" means two or more.

[0040] In this embodiment, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0041] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0042] Combination Figure 1 As shown in the figure, this application embodiment provides a multi-split air conditioner, including one outdoor unit 10 and multiple indoor units 20. The outdoor unit 10 and each indoor unit 20 are communicatively connected, allowing the outdoor unit 10 to obtain the operating status of each indoor unit 20 at any time.

[0043] In a multi-split air conditioning system, the outdoor unit compressor capacity control method usually involves setting a target low-pressure PsTar (or the corresponding saturation temperature PsTempTar) for cooling and a target high-pressure PdTar (or the corresponding saturation temperature PdTempTar) for heating. The difference between the target value and the actual value is compared, and the compressor frequency is adjusted to achieve the target pressure.

[0044] Calculating load capacity solely based on pre-set target pressure does not take into account the actual load demand of each indoor unit. During actual operation, the load demand of the indoor unit changes constantly due to factors such as installation location, indoor unit capacity, and user-set parameters. Therefore, the outdoor unit capacity control cannot fully adapt to every application scenario.

[0045] This application embodiment calculates the individual load of each indoor unit in a hierarchical manner and adjusts the refrigerant flow of the indoor unit's expansion valve. The outdoor unit, based on the actual pressure value, exhibits hierarchical control capabilities, enabling it to adapt to different application scenarios. This rapidly improves air conditioning performance while also contributing to energy conservation and control stability in multi-split air conditioning systems.

[0046] Combination Figure 2 The image shows a method for controlling a multi-split air conditioner according to an embodiment of this application. This method can be applied to... Figure 1 On the multi-split air conditioner shown, such as Figure 2 As shown, the method includes:

[0047] S201: Obtain the temperature difference between the actual temperature and the set temperature of each indoor unit.

[0048] S202: Determine the individual indoor unit load corresponding to each temperature difference.

[0049] S203: Determine the total load of the indoor units of a multi-split air conditioner based on the load of each indoor unit.

[0050] S204: Outdoor unit operation is controlled based on indoor unit load control.

[0051] The method provided in this application determines the individual load of each indoor unit based on the temperature difference between the actual temperature and the set temperature, thereby determining the total load of all indoor units, and controlling the operation of the outdoor unit based on the total load. The temperature difference of each indoor unit accurately reflects its current state; therefore, the individual load calculated based on the temperature difference is more accurate. Compared to simply relying on a pre-set target pressure for outdoor unit control, the method in this application can effectively improve the control accuracy of the outdoor unit.

[0052] Optionally, the method for controlling a multi-split air conditioner can be executed in the multi-split air conditioner system or in a server communicating with the multi-split air conditioner system. In this embodiment, the solution is described using a processor in the multi-split air conditioner system as the execution entity.

[0053] The temperature difference mentioned above is the difference between the indoor ambient temperature and the set temperature when cooling, and the difference between the set temperature and the indoor ambient temperature when heating.

[0054] Combination Figure 3 The image shows another method for controlling a multi-split air conditioner provided in this application embodiment. This method can be applied to... Figure 1 On the multi-split air conditioner shown, such as Figure 3 As shown, the method includes:

[0055] S301: Obtain the temperature difference between the actual temperature and the set temperature of each indoor unit.

[0056] S302: Determine the temperature difference range within which the temperature difference exists;

[0057] S303: Determine the target correspondence between the indoor unit's single-unit load and the temperature difference based on the temperature difference range within which the temperature difference exists;

[0058] S304: Based on the target correspondence, determine the single indoor unit load corresponding to each temperature difference.

[0059] S305: Determine the total load of the indoor units of a multi-split air conditioner based on the load of each indoor unit.

[0060] S306: Outdoor unit operation is controlled based on the load of the indoor unit's main unit.

[0061] In related technologies, the indoor unit load is usually calculated directly by multiplying the temperature difference between the set temperature and the ambient temperature by the indoor unit's capacity. However, this calculation is too simplistic and cannot truly reflect the actual application environment. The method provided in this application's embodiments allows for the determination of a target correspondence that matches the actual temperature of each indoor unit based on the actual scenario. Furthermore, different target correspondences are applied to calculate the indoor unit load of each indoor unit within a multi-split air conditioner. Compared to the prior art where a fixed calculation method is used to determine the indoor unit load for all indoor units, the indoor unit load result obtained in this application is more accurate, effectively improving the accuracy of outdoor unit control.

[0062] Combination Figure 4 As shown, this application provides a method for determining the target correspondence of an indoor unit, as illustrated in an embodiment. Figure 4 As shown, the method includes:

[0063] S401: When the temperature difference is within the first temperature difference range, the target correspondence is determined to be a quadratic curve relationship;

[0064] S402: When the temperature difference is within the second temperature difference range, the target correspondence is determined to be a linear relationship.

[0065] S403: When the temperature difference is within the third temperature difference range, the target correspondence is determined to be a constant value relationship;

[0066] S404: When the temperature difference is within the fourth temperature difference range, the target correspondence is determined to be a linear relationship.

[0067] Wherein, the lower limit threshold of the first temperature difference range is greater than or equal to the upper limit threshold of the second temperature difference range, the lower limit threshold of the second temperature difference range is greater than or equal to the upper limit threshold of the third temperature difference range, and the lower limit threshold of the third temperature difference range is greater than or equal to the upper limit threshold of the fourth temperature difference range.

[0068] The relationship between load and temperature difference is not a simple linear one; it exhibits different curves at different stages. Generally, it's linear when the temperature difference is small, but a quadratic curve appears when the temperature difference is large. Calculating the load in tiers is beneficial for quickly improving air conditioning performance when the temperature difference is large. The relationship from the first to the fourth temperature difference range is from high to low; that is, a quadratic curve appears when the temperature difference is large, and a linear curve generally appears when the temperature difference is small. This conclusion was obtained after verification and analysis of a large amount of actual data. Therefore, the target correspondence determined based on this conclusion can more accurately calculate the single-unit load, thereby further improving the control precision of the outdoor unit.

[0069] Specifically, three thresholds can be defined to divide the temperature range into four ranges. For example, a first threshold, a second threshold, and a third threshold can be set, with the following relationship: first threshold > second threshold > third threshold. When the temperature difference is greater than the first threshold, the temperature difference is determined to be within the first temperature difference range. When the temperature difference is less than or equal to the first threshold and greater than the second threshold, the temperature difference is determined to be within the second temperature difference range. When the temperature difference is less than or equal to the second threshold and greater than the third threshold, the temperature difference is determined to be within the third temperature difference range. When the temperature difference is less than or equal to the third threshold, the temperature difference is determined to be within the fourth temperature difference range.

[0070] Optionally, the second threshold and the third threshold are set to satisfy the following relationship: second threshold > 0 > third threshold.

[0071] Preferably, the first threshold can be set to 6℃, the second threshold to 1℃, and the third threshold to -1℃.

[0072] Optionally, the above-mentioned determination of the target correspondence relationship is a quadratic curve relationship, including: determining a quadratic function based on the square of the temperature difference, the temperature difference, and the capacity of the indoor unit; and determining the quadratic function as the target correspondence relationship.

[0073] Specifically, the single-unit load of each indoor unit can be calculated using the following quadratic function:

[0074] IULoad=(rate1*detT*detT+rate2*detT+rate3)*IUHP

[0075] Wherein, IUHP represents the capacity (in horsepower) of the indoor unit, and rate1, rate2, and rate3 are calculation coefficients. Preferably, rate1 = 0.2, rate2 = 0.3, and rate3 = 0.2. Each calculation coefficient can be adjusted based on laboratory test results; this embodiment does not limit this adjustment.

[0076] Optionally, determining the target correspondence function as a linear relationship includes: determining a linear function based on the temperature difference and the capacity of the indoor unit; and determining the linear function as the target correspondence.

[0077] Specifically, the single-unit load of each indoor unit can be calculated according to the following linear relationship:

[0078] IULoad=(rate4*detT+rate5)*IUHP

[0079] Wherein, IUHP is the capacity of the indoor unit in horsepower, and rate4 and rate5 are calculation coefficients. Each calculation coefficient can be corrected based on the laboratory test results, and this application embodiment does not limit this.

[0080] Optionally, a linear relationship includes a first-order linear relationship and a second-order linear relationship. The coefficients for the first-order linear relationship and the second-order linear relationship are different.

[0081] Optionally, if the temperature difference falls within the second temperature difference range, the target correspondence is determined to be a first linear relationship.

[0082] Optionally, if the temperature difference falls within the fourth temperature difference range, the target correspondence is determined to be a second linear relationship.

[0083] Specifically, the first-order linear relationship can be defined as follows:

[0084] IULoad = (rate4 * detT + rate5) * IUHP, preferably, rate4 = 0.9 and rate5 = 1.0.

[0085] Let the first-order linear relationship be:

[0086] IULoad = (rate6 * detT + rate7) * IUHP, preferably, rate6 = 0.8 and rate7 = 0.6.

[0087] Optionally, in step S403 above, when the temperature difference is within the third temperature difference range, determining the target correspondence as a constant value relationship can specifically be: setting IULoad = 0.

[0088] Optionally, the total indoor unit load of the multi-split air conditioner is determined based on the individual indoor unit load, including: determining the weight value of the individual indoor unit load corresponding to each temperature difference; and determining the total indoor unit load based on the individual indoor unit load and the weight value of the individual indoor unit load.

[0089] Combination Figure 5 The image shows a method for controlling a multi-split air conditioner according to an embodiment of this application. This method can be applied to... Figure 1 The method described in the example of the multi-split air conditioner mainly describes how to control the operation of the outdoor unit based on the total load of the indoor units. For example... Figure 5 As shown, the method includes:

[0090] S501: Obtain the temperature difference between the actual temperature and the set temperature of each indoor unit.

[0091] S502: Determine the individual indoor unit load corresponding to each temperature difference.

[0092] S503: Determine the total load of the indoor units of a multi-split air conditioner based on the load of each indoor unit.

[0093] S504: Determine the range of indoor unit loads within which the indoor unit load falls;

[0094] S505: Adjust the operating frequency of the outdoor unit according to the load range of the indoor unit.

[0095] The method provided in this embodiment divides the load of the indoor unit into multiple ranges, each with a different adjustment method. The upper and lower thresholds of the ranges and the corresponding adjustment methods can be adjusted according to the actual application scenario to achieve precise control of the outdoor unit frequency.

[0096] Combination Figure 6 The image shows a method for controlling a multi-split air conditioner according to an embodiment of this application. This method can be applied to... Figure 1 On the multi-split air conditioner shown. Figure 6 As shown, the method includes:

[0097] S601: Obtain the temperature difference between the actual temperature and the set temperature of each indoor unit.

[0098] S602: Determine the individual indoor unit load corresponding to each temperature difference.

[0099] S603: Determine the total load of the indoor units of a multi-split air conditioner based on the load of each indoor unit.

[0100] S604: Obtain the actual pressure value for each indoor unit;

[0101] S605: Adjust the outdoor unit frequency based on the relationship between the actual pressure value and the target pressure value of each indoor unit.

[0102] S606: Determine the range of indoor unit loads within which the indoor unit load falls;

[0103] S607: Adjust the operating frequency of the outdoor unit according to the load range of the indoor unit.

[0104] Optionally, the actual pressure value of each indoor unit includes: when the multi-split air conditioner is in cooling mode, the actual pressure value is the actual suction pressure value of the compressor; or, when the multi-split air conditioner is in heating mode, the actual pressure value is the actual exhalation pressure value of the compressor.

[0105] Optionally, when the multi-split air conditioner is in cooling mode, step S605 in the above embodiment, adjusting the outdoor unit frequency according to the relationship between the actual pressure value and the target pressure value of each indoor unit, includes:

[0106] When the actual pressure value of each indoor unit is greater than the first pressure threshold, the operating capacity of the outdoor unit is adjusted and the frequency is increased according to the target pressure value.

[0107] Alternatively, if the actual pressure value of each indoor unit is less than the second pressure threshold, the operating frequency of the outdoor unit can be reduced according to the target pressure value.

[0108] Alternatively, if the actual pressure value of each indoor unit is greater than or equal to the second pressure threshold and less than or equal to the first pressure threshold, the outdoor unit can be operated according to the total load of the indoor units.

[0109] The first pressure threshold is the sum of the target pressure value and threshold 4, and the second pressure threshold is the difference between the target pressure and threshold 5.

[0110] Specifically, the above process can be represented as follows: When the air conditioner is in cooling mode, if the actual pressure (Ps) > target pressure (Ps) + threshold 4: adjust the outdoor unit's operating capacity by increasing the frequency according to the target pressure (Ps); if the actual pressure (Ps) < target pressure (Ps) - threshold 5: adjust the outdoor unit's operating capacity by decreasing the frequency according to the target pressure (Ps), where target pressure (Ps) is the target pressure value and actual pressure (Ps) is the actual pressure value. In this way, the operating capacity can be increased when the actual pressure value is high, and decreased when the actual pressure value is low, further improving the outdoor unit's operating efficiency.

[0111] Preferably, threshold 4 can be set to 0.3 MPa and threshold 5 can be set to 0.05 MPa.

[0112] Optionally, when the multi-split air conditioner is in heating mode, step S605 in the above embodiment, adjusting the outdoor unit frequency according to the relationship between the actual pressure value and the target pressure value of each indoor unit, includes:

[0113] When the actual pressure value of each indoor unit is less than the third pressure threshold, the operating capacity of the outdoor unit is increased according to the target pressure value.

[0114] Alternatively, if the actual pressure value of each indoor unit is greater than the fourth pressure threshold, the operating frequency of the outdoor unit can be reduced according to the target pressure value.

[0115] Alternatively, if the actual pressure value of each indoor unit is greater than or equal to the third pressure threshold and less than or equal to the fourth pressure threshold, the outdoor unit can be operated according to the total load of the indoor units.

[0116] The third pressure threshold is the difference between the target pressure value and threshold 8, and the fourth pressure threshold is the sum of the target pressure and threshold 9.

[0117] Specifically, the above process can be represented as follows: When the air conditioner is in cooling mode, if the actual pressure (Pd) is less than the target pressure (Pd - threshold 8), the outdoor unit's operating capacity is increased according to the target pressure (Pd); if the actual pressure (Pd) is greater than the target pressure (Pd + threshold 9), the outdoor unit's operating capacity is decreased according to the target pressure (Pd). Here, the actual pressure (Pd) is the actual pressure value, and the target pressure (Pd) is the target pressure value. This allows for increased operating capacity when the actual pressure is high, and decreased operating capacity when the actual pressure is low, further improving the outdoor unit's operating efficiency.

[0118] Preferably, threshold 8 can be set to 0.35 MPa and threshold 9 can be set to 0.1 MPa.

[0119] Optionally, the operating frequency of the outdoor unit is adjusted according to the indoor unit load range in which the indoor unit load falls, including: increasing the operating frequency of the outdoor unit when the indoor unit load range is a first indoor unit load range; maintaining the operating frequency of the outdoor unit when the indoor unit load range is a second indoor unit load range; and decreasing the operating frequency of the outdoor unit when the indoor unit load range is a third indoor unit load range; wherein the upper limit threshold of the first indoor unit load is less than or equal to the lower limit threshold of the second indoor unit load, and the upper limit threshold of the second indoor unit load is less than or equal to the lower limit threshold of the third indoor unit load.

[0120] In this way, the load range of the first to the third indoor unit gradually increases. This means that when the total indoor unit load is low, it indicates insufficient outdoor unit capacity, requiring an increase in outdoor unit capacity. When the indoor unit capacity is balanced, the current operating capacity is maintained to achieve energy savings. Conversely, when the indoor unit load is high, it indicates excess outdoor unit capacity, allowing for an appropriate reduction in outdoor unit capacity, for example, by reducing the frequency by a specified amount within a given timeframe. Through this tiered control and adjustment of the outdoor units, precise outdoor unit control can be achieved, improving control accuracy.

[0121] Optionally, the upper limit threshold of the total load of the first indoor unit is equal to the lower limit threshold of the total load of the second indoor unit, and the upper limit threshold of the total load of the second indoor unit is equal to the lower limit threshold of the total load of the third indoor unit.

[0122] Combination Figure 7 The image shows a method for controlling a multi-split air conditioner according to an embodiment of this application. This method can be applied to... Figure 1 On the multi-split air conditioner shown, such as Figure 7 As shown, the method includes:

[0123] S701: Obtain the temperature difference between the actual temperature and the set temperature of each indoor unit.

[0124] S702: Determine the individual indoor unit load corresponding to each temperature difference.

[0125] S703: Determine the total load of the indoor units of a multi-split air conditioner based on the load of each indoor unit.

[0126] S704: Determine the range of indoor unit loads within which the indoor unit load falls;

[0127] S705: Adjust the operating frequency of the outdoor unit according to the load range of the indoor unit.

[0128] S706: When the load range of the indoor unit's main unit is within the second indoor unit's main unit load range, adjust the opening degree of the expansion valve corresponding to each indoor unit.

[0129] In this way, the total indoor unit load falls within the second total indoor unit load range, indicating that the current total indoor unit load meets the demand and maintains the outdoor unit's operating capacity unchanged. At this point, the refrigerant is distributed among the indoor units by adjusting the opening of their expansion valves to meet the load requirements of each unit.

[0130] Optionally, adjusting the opening of the expansion valve corresponding to each indoor unit includes: determining the temperature difference range of each indoor unit; determining a target adjustment strategy corresponding to the temperature difference based on the temperature difference range of each indoor unit; and adjusting the expansion valve of the indoor unit according to the target adjustment strategy.

[0131] Alternatively, the target regulation strategy corresponding to the temperature difference can be determined as follows:

[0132] (1) When the temperature difference is less than the first temperature difference threshold, the target adjustment strategy is to reduce the opening degree;

[0133] (2) When the temperature difference is greater than or equal to the first temperature difference threshold and less than the second temperature difference threshold, the target adjustment strategy is determined to be the maintenance strategy.

[0134] (3) When the temperature difference is greater than or equal to the second temperature difference threshold, the target adjustment strategy is determined to be an automatic adjustment strategy; wherein the first temperature difference threshold is less than the second temperature difference threshold.

[0135] In this embodiment, when the temperature difference is small, it indicates that the indoor unit's load demand has been met. At this time, the opening degree can be reduced to ensure the performance of other indoor units, allowing more refrigerant to flow to them. This achieves energy saving and improves control efficiency. If the temperature difference is balanced, it indicates that the current indoor unit load is balanced, and there is no need to change the opening degree. If the temperature difference is too high, it indicates that the temperature difference has little impact on the load. In this case, the expansion valve needs to be automatically adjusted based on other air conditioning parameters. Specifically, this can be based on the indoor unit coil temperature, superheat, etc. Thus, by controlling the opening degree in stages, precise control of the indoor unit's expansion valve is achieved, saving energy, preventing ineffective control, and improving control accuracy.

[0136] Specifically, the opening degree control method for each indoor unit's expansion valve can be set as follows: (using detT to represent the temperature difference)

[0137] (1) detT≥threshold2: Automatic control, such as normal control based on indoor unit coil temperature, superheat, etc.

[0138] (2) 0≤detT<threshold 2: The opening of the expansion valve remains unchanged.

[0139] (3) Threshold 3≤detT<0: The load demand of this indoor unit has been met. In order to ensure the effect of other indoor units, the opening of the expansion valve of this indoor unit is reduced according to a fixed value, such as 5pls every 1 minute.

[0140] (4) detT<threshold 3: The load demand of this indoor unit has been over-satisfied, so accelerate the adjustment of the expansion valve opening.

[0141] Optionally, the above method further includes: adjusting the rate at which the opening decreases based on the temperature difference when the temperature difference is less than a first temperature difference threshold.

[0142] Optionally, adjusting the opening speed based on the temperature difference includes: if the temperature difference of the indoor unit is less than a threshold 3, reducing the opening speed according to a first speed; or, if the temperature difference of the indoor unit is between the threshold 3 and 0, reducing the opening speed according to a second speed; wherein the first speed is less than the second speed.

[0143] Preferably, the threshold 2 > 0 > threshold 3.

[0144] In the above embodiments, when the temperature difference is small, it indicates that the demand is basically met, and only the opening degree needs to be reduced. However, when the temperature difference continues to decrease, it indicates that the indoor unit load has been excessively met, and the opening degree needs to be reduced more rapidly. Specifically, the first speed can be a fixed reduction speed, for example, a reduction of 5 pls per minute. The second speed can be a linear reduction speed, for example, a reduction value downVal = (rate8 * detT + rate9) * PerMAXPLS over a specified time (e.g., 20 seconds), and satisfying downVal <= PerMAXPLS. PerMAXPLS is the maximum opening degree of the indoor unit expansion valve for each adjustment, such as 20 pls.

[0145] Combination Figure 8 As shown in the figure, this application provides a device 800 for controlling a multi-split air conditioner, including a processor 100 and a memory 101. Optionally, the device may further include a communication interface 102 and a bus 103. The processor 100, communication interface 102, and memory 101 can communicate with each other via the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call logical instructions in the memory 101 to execute the method for controlling a multi-split air conditioner described in any of the above embodiments.

[0146] Furthermore, the logic instructions in the aforementioned memory 101 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0147] The memory 101, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this application. The processor 100 executes functional applications and data processing by running the program instructions / modules stored in the memory 101, that is, it implements the method for controlling multi-split air conditioners described in the above embodiments.

[0148] The memory 101 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 101 may include high-speed random access memory and may also include non-volatile memory.

[0149] Combination Figure 9 As shown, a multi-split air conditioner 900 provided in this application embodiment includes: an outdoor unit 901; and multiple indoor units 902 connected to the outdoor unit; as shown in the figure. Figure 8 The device 800 shown for controlling a multi-split air conditioner is installed on either the outdoor unit 901 or the indoor unit 902. The installation relationship described herein is not limited to placement inside the multi-split air conditioner, but also includes installation connections with other components of the multi-split air conditioner, including but not limited to physical connections, electrical connections, or signal transmission connections. Those skilled in the art will understand that the device 800 for controlling a multi-split air conditioner can be adapted to any feasible multi-split air conditioner, thereby enabling other feasible embodiments.

[0150] This application provides a computer-readable storage medium storing computer-executable instructions configured to perform the method for controlling a multi-split air conditioner described in the above embodiments.

[0151] This application provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions, which, when executed by a computer, cause the computer to perform the method for controlling a multi-split air conditioner described in the above embodiment.

[0152] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0153] The technical solutions of this application embodiment can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this application embodiment. The aforementioned storage medium can be a non-transitory storage medium, including: USB flash drive, portable hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0154] The foregoing description and accompanying drawings fully illustrate embodiments of this application to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or,” as used herein, means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0155] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0156] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of this application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0157] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description; sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling a multi-split air conditioner, characterized by, The multi-connected air conditioner comprises an outdoor unit and a plurality of indoor units connected with the outdoor unit; the method comprises: obtaining a temperature difference between an actual temperature and a set temperature of each indoor unit; determining a temperature difference range in which the temperature difference is located; determining a target corresponding relationship between the indoor unit single load and the temperature difference according to the temperature difference range in which the temperature difference is located; determining the indoor unit single load corresponding to each temperature difference based on the target corresponding relationship; determining the indoor unit total load of the multi-connected air conditioner according to the indoor unit single load; controlling the operation of the outdoor unit based on the indoor unit total load; wherein, the target corresponding relationship between the indoor unit single load and the temperature difference is determined according to the temperature difference range in which the temperature difference is located, comprising: in the case that the temperature difference range in which the temperature difference is located is a first temperature difference range, determining that the target corresponding relationship is a quadratic curve relationship; in the case that the temperature difference range in which the temperature difference is located is a second temperature difference range, determining that the target corresponding relationship is a linear relationship; in the case that the temperature difference range in which the temperature difference is located is a third temperature difference range, determining that the target corresponding relationship is a constant value relationship; in the case that the temperature difference range in which the temperature difference is located is a fourth temperature difference range, determining that the target corresponding relationship is a linear relationship; wherein, the lower limit threshold of the first temperature difference range is greater than or equal to the upper limit threshold of the second temperature difference range, the lower limit threshold of the second temperature difference range is greater than or equal to the upper limit threshold of the third temperature difference range, and the lower limit threshold of the third temperature difference range is greater than or equal to the upper limit threshold of the fourth temperature difference range.

2. The method of claim 1, wherein, determining that the target corresponding relationship is a quadratic curve relationship, comprising: determining a quadratic function according to the square of the temperature difference, the temperature difference and the indoor unit capacity number; determining the quadratic function as the target corresponding relationship.

3. The method according to claim 1 or 2, characterized in that, controlling the operation of the outdoor unit based on the indoor unit total load, comprising: determining an indoor unit total load range in which the indoor unit total load is located; adjusting the operation frequency of the outdoor unit according to the indoor unit total load range in which the indoor unit total load is located.

4. The method of claim 3, wherein, adjusting the operation frequency of the outdoor unit according to the indoor unit total load range in which the indoor unit total load is located, comprising: in the case that the indoor unit total load range in which the indoor unit total load is located is a first indoor unit total load range, increasing the operation frequency of the outdoor unit; in the case that the indoor unit total load range in which the indoor unit total load is located is a second indoor unit total load range, maintaining the operation frequency of the outdoor unit; in the case that the indoor unit total load range in which the indoor unit total load is located is a third indoor unit total load range, decreasing the operation frequency of the outdoor unit; wherein, the upper limit threshold of the first indoor unit total load is less than or equal to the lower limit threshold of the second indoor unit total load, and the upper limit threshold of the second indoor unit total load is less than or equal to the lower limit threshold of the third indoor unit total load.

5. The method of claim 4, wherein, the upper limit threshold of the first indoor unit total load is equal to the lower limit threshold of the second indoor unit total load, and the upper limit threshold of the second indoor unit total load is equal to the lower limit threshold of the third indoor unit total load.

6. The method of claim 4, wherein, controlling the operation of the outdoor unit based on the indoor unit total load, further comprising: in the case that the indoor unit total load range in which the indoor unit total load is located is the second indoor unit total load range, adjusting the opening degree of the expansion valve corresponding to each indoor unit.

7. An apparatus for controlling a multi-split air conditioner, comprising a processor and a memory having stored program instructions, characterized in that, The processor is configured to execute, when executing the program instructions, the method for controlling the multi-split air conditioner according to any one of claims 1 to 6.

8. A multi-split air conditioner, characterized in that, Comprise: An outdoor unit; A plurality of indoor units connected with the outdoor unit; The device for controlling the multi-split air conditioner according to claim 7 is installed in the outdoor unit or the indoor unit.

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