CN118896386A - Method and device for controlling multi-split air conditioner and multi-split air conditioner - Google Patents

Abstract

The application relates to the technical field of air conditioners, and discloses a method and a device for controlling a multi-split air conditioner and the multi-split air conditioner. According to the method, the single-machine load of each indoor unit is determined according to the temperature difference between the actual temperature and the set temperature, the total machine load of all the indoor units is further determined, and the operation of the outdoor unit is controlled 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 obtained based on temperature difference calculation is more accurate, and compared with the mode of controlling the outdoor unit by simply relying on preset target pressure, the method provided by the embodiment of the application can effectively improve the control accuracy of the outdoor unit.

Description

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

Technical Field

The present application relates to the technical field of air conditioning, for example, to a method and device for controlling a multi-split air conditioner and a multi-split air conditioner.

Background Art

In a multi-split system, the method for controlling the capacity of the outdoor unit compressor is usually to set the cooling target low pressure PsTar (or the corresponding saturation temperature PsTempTar) and the heating target high pressure PdTar (or the corresponding saturation temperature PdTempTar), compare the difference between the target value and the actual value, determine the indoor unit load, and then adjust the compressor frequency to achieve the target pressure.

In the process of implementing the embodiments of the present application, it is found that there are at least the following problems in the related technology:

The indoor unit load calculated in the related technology is often not accurate enough, resulting in insufficient sensitivity of the outdoor unit control, which is not conducive to quickly achieving the expected air-conditioning effect.

It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field.

Summary of the invention

In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key/critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

The embodiments of the present application provide a method, an apparatus and a multi-split air conditioner for controlling a multi-split air conditioner to improve the control accuracy of an air conditioner outdoor unit.

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 of each indoor unit and the set temperature; determining the single-unit 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 single-unit load of the indoor units; and controlling the operation of the outdoor unit based on the total load of the indoor units.

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 a target corresponding relationship 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 corresponding relationship.

Optionally, according to the temperature difference range in which the temperature difference is located, the target corresponding relationship between the indoor unit load and the temperature difference is determined, including: when the temperature difference range in which the temperature difference is located is the first temperature difference range, determining the target corresponding relationship as a quadratic curve relationship; when the temperature difference range in which the temperature difference is located is the second temperature difference range, determining the target corresponding relationship as a linear relationship; when the temperature difference range in which the temperature difference is located is the third temperature difference range, determining the target corresponding relationship as a constant value relationship; when the temperature difference range in which the temperature difference is located is the fourth temperature difference range, determining the target corresponding relationship as 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.

Optionally, determining the target corresponding relationship as a quadratic curve relationship includes: determining a quadratic function according to the square of the temperature difference, the temperature difference, and the indoor unit capacity matching number; and determining the quadratic function as the target corresponding relationship.

Optionally, determining the target correspondence function as a linear relationship includes: determining a linear function according to the temperature difference and the indoor unit capacity matching number; and determining the linear function as the target correspondence.

Optionally, determining the total load of the indoor units of the multi-split air conditioner according to the single load of the indoor unit includes: determining the weight value of the single load of the indoor unit corresponding to each temperature difference; determining the total load of the indoor units according to the single load of the indoor unit and the weight value of the single load of the indoor unit.

Optionally, controlling the operation of the outdoor unit based on the indoor unit total load includes: determining an indoor unit total load range in which the indoor unit total load is located; and 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.

Optionally, the operating frequency of the outdoor unit is adjusted according to the indoor unit total load range of the indoor unit total load, including: when the indoor unit total load range of the indoor unit total load is a first indoor unit total load range, increasing the operating frequency of the outdoor unit; when the indoor unit total load range of the indoor unit total load is a second indoor unit total load range, maintaining the operating frequency of the outdoor unit; when the indoor unit total load range of the indoor unit total load is a third indoor unit total load range, reducing the operating 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.

Optionally, the upper threshold of the total load of the first indoor units is equal to the lower threshold of the total load of the second indoor units, and the upper threshold of the total load of the second indoor units is equal to the lower threshold of the total load of the third indoor units.

Optionally, controlling the operation of the outdoor unit based on the indoor unit total load further includes: when the indoor unit total load range where the indoor unit total load is located is a second indoor unit total load range, adjusting the opening of the expansion valve corresponding to each indoor unit.

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

Optionally, determining a 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 to reduce the opening degree; 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 to be a maintenance strategy; when the temperature difference is greater than or equal to the second temperature difference threshold, determining the target adjustment strategy to be an automatic adjustment strategy; wherein the first temperature difference threshold is less than the second temperature difference threshold.

Optionally, the method further includes: when the temperature difference is less than a first temperature difference threshold, adjusting the speed of reducing the opening degree based on the temperature difference.

Optionally, the speed of reducing the opening degree is adjusted based on the temperature difference, including: if the temperature difference of the indoor unit is less than 3, reducing the opening degree at a first speed; or, if the temperature difference of the indoor unit is between 3-0, reducing the opening degree at a second speed; wherein the first speed is less than the second speed.

In some embodiments, the device includes: a processor and a memory storing program instructions, wherein the processor is configured to execute the above-mentioned method for controlling a multi-split air conditioner when executing the program instructions.

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

The method, device and multi-split air conditioner for controlling a multi-split air conditioner provided in the embodiments of the present application can achieve the following technical effects:

The above method provided in the embodiment of the present application determines the single unit load of each indoor unit according to the temperature difference between the actual temperature and the set temperature, and then determines the total unit load of all indoor units, and controls the operation of the outdoor unit based on the total unit load. The temperature difference of each indoor unit can accurately reflect the current state of the indoor unit. Therefore, the single unit load calculated based on the temperature difference is more accurate. Compared with the method of controlling the outdoor unit simply by relying on a pre-set target pressure, the method of the embodiment of the present application can effectively improve the control accuracy of the outdoor unit.

The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

FIG1 is a schematic diagram of a hardware environment of a method for controlling a multi-split air conditioner according to an embodiment of the present application;

FIG2 is a schematic diagram of a method for controlling a multi-split air conditioner provided in an embodiment of the present application;

FIG3 is a schematic diagram of another method for controlling a multi-split air conditioner provided in an embodiment of the present application;

FIG4 is a schematic diagram of another method for controlling a multi-split air conditioner provided in an embodiment of the present application;

FIG5 is a schematic diagram of another method for controlling a multi-split air conditioner provided in an embodiment of the present application;

FIG6 is a schematic diagram of another method for controlling a multi-split air conditioner provided in an embodiment of the present application;

FIG7 is a schematic diagram of another method for controlling a multi-split air conditioner provided in an embodiment of the present application;

FIG8 is a schematic diagram of a device for controlling a multi-split air conditioner provided in an embodiment of the present application;

FIG. 9 is a schematic diagram of a multi-split air conditioner provided in an embodiment of the present application.

DETAILED DESCRIPTION

In order to be able to understand the features and technical contents of the embodiments of the present application in more detail, the implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

The terms "first", "second", etc. in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present application described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

Unless otherwise stated, the term "plurality" means two or more.

In the embodiment of the present application, the character "/" indicates that the preceding and following objects are in an "or" relationship. For example, A/B means: A or B.

The term "and/or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and/or B means: A or B, or, A and B.

As shown in Figure 1, the embodiment of the present application provides a multi-split air conditioner, including an outdoor unit 10 and multiple indoor units 20. The outdoor unit 10 is connected to each indoor unit 20 in communication, and the outdoor unit 10 can obtain the operating status of each indoor unit 20 at any time.

In a multi-split system, the method for controlling the capacity of the outdoor unit compressor is usually to set the cooling target low pressure PsTar (or the corresponding saturation temperature PsTempTar) and the heating target high pressure PdTar (or the corresponding saturation temperature PdTempTar), compare the difference between the target value and the actual value, adjust the compressor frequency, and achieve the target pressure.

The calculation of load capacity relies solely on the pre-set target pressure and does not take into account the actual load demand of each indoor unit. In the actual operation of the indoor unit, the load demand changes at any time due to the influence of the installation location, the capacity of the indoor unit, the user-set parameters, etc. The outdoor unit capacity control cannot fully adapt to any application scenario.

The embodiment of the present application calculates the load of each indoor unit in a hierarchical manner and adjusts the refrigerant flow rate of the expansion valve of the indoor unit. The outdoor unit has hierarchical control capabilities according to the actual pressure value, which can adapt to different application scenarios, and while quickly improving the air conditioning effect, it is beneficial to the energy saving and control stability of the multi-split air conditioner.

In conjunction with FIG. 2 , a method for controlling a multi-split air conditioner is provided in an embodiment of the present application. The method can be applied to the multi-split air conditioner shown in FIG. 1 . As shown in FIG. 2 , the method includes:

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

S202: Determine the single-unit load of the indoor unit corresponding to each temperature difference.

S203: Determine the total load of the indoor units of the multi-split air conditioner according to the load of each indoor unit.

S204: Controlling the operation of the outdoor unit based on the total load of the indoor units.

The above method provided in the embodiment of the present application determines the single unit load of each indoor unit according to the temperature difference between the actual temperature and the set temperature, and then determines the total unit load of all indoor units, and controls the operation of the outdoor unit based on the total unit load. The temperature difference of each indoor unit can accurately reflect the current state of the indoor unit. Therefore, the single unit load calculated based on the temperature difference is more accurate. Compared with the method of controlling the outdoor unit simply by relying on a pre-set target pressure, the method of the embodiment of the present application can effectively improve the control accuracy of the outdoor unit.

Optionally, the method for controlling a multi-split air conditioner can be executed in the multi-split air conditioner system, or in a server that communicates with the multi-split air conditioner system. In the embodiment of the present application, the solution is described with the processor in the multi-split air conditioner system as the execution subject.

The temperature difference is the difference between the indoor ambient temperature and the set temperature during cooling, and is the difference between the set temperature and the indoor ambient temperature during heating.

In conjunction with FIG. 3 , another method for controlling a multi-split air conditioner provided in an embodiment of the present application is provided. The method can be applied to the multi-split air conditioner shown in FIG. 1 . As shown in FIG. 3 , the method includes:

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

S302: Determine the temperature difference range in which the temperature difference lies;

S303: determining a target corresponding relationship between the indoor unit load and the temperature difference according to the temperature difference range in which the temperature difference is located;

S304: Determine the single-unit load of the indoor unit corresponding to each temperature difference based on the target corresponding relationship.

S305: Determine the total load of the indoor units of the multi-split air conditioner according to the load of each indoor unit.

S306: Controlling the operation of the outdoor unit based on the total load of the indoor units.

In the related art, the indoor unit load is usually directly calculated based on the temperature difference between the set temperature and the ambient temperature and the product of the indoor unit capacity, but this calculation is too simple and cannot really meet the actual application environment. Through the above method provided in the embodiment of the present application, a target correspondence relationship that matches the actual temperature of each indoor unit can be determined based on the actual scenario, and then on multiple indoor units in a multi-split air conditioner, different target correspondence relationships are applied to calculate the indoor unit load of each indoor unit. Compared with the prior art in which all indoor units are determined by a fixed calculation method, the indoor unit load result obtained by the present application is more accurate, which effectively improves the accuracy of external unit control.

In conjunction with FIG. 4 , a method for determining a target correspondence relationship corresponding to an indoor unit is provided in an embodiment of the present application. As shown in FIG. 4 , the method includes:

S401: When 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;

S402: When 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;

S403: When 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 fixed value relationship;

S404: When 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;

Among them, 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.

The load and temperature difference are not a simple linear relationship, and there are different curves at different stages. When the temperature difference is small, it is generally a linear relationship, but when the temperature difference is large, it is a quadratic curve. Calculating the load in layers is conducive to quickly improving the air conditioning effect when the temperature difference is large. The first temperature difference range to the fourth temperature difference range is a high to low relationship, that is, when the temperature difference is large, it is a quadratic curve, and when the temperature difference is small, it is generally a linear curve. The above conclusions are obtained after verification and analysis of a large amount of actual data. Therefore, based on the target correspondence determined by this conclusion, it is also possible to calculate the accurate single-machine load, thereby further improving the control accuracy of the outdoor unit.

Specifically, three thresholds can be defined, and then four temperature ranges can be divided. For example, a first threshold, a second threshold, and a third threshold are set, and the size relationship of the three thresholds satisfies: first threshold> second threshold> third threshold. When the temperature difference is greater than the first threshold, it is determined that the temperature difference is in the first temperature difference range. When the temperature difference is less than or equal to the first threshold, and greater than the second threshold, it is determined that the temperature difference is in the second temperature difference range. When the temperature difference is less than or equal to the second threshold, and greater than the third threshold, it is determined that the temperature difference is in the third temperature difference range. When the temperature difference is less than or equal to the third threshold, it is determined that the temperature difference is in the fourth temperature difference range.

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

Preferably, the first threshold value may be set to 6°C, the second threshold value = 1°C, and the third threshold value = -1°C.

Optionally, the above-mentioned determination of the target corresponding relationship as a quadratic curve relationship includes: determining a quadratic function according to the square of the temperature difference, the temperature difference and the indoor unit capacity matching number; and determining the quadratic function as the target corresponding relationship.

Specifically, the single-unit load of each indoor unit can be calculated according to the following quadratic function:

IULoad＝(rate1*detT*detT+rate2*detT+rate3)*IUHP

Wherein, IUHP is the indoor unit capacity, rate1, rate2, rate3 are calculation coefficients, preferably, rate1=0.2, rate2=0.3, rate3=0.2 can be set. Each calculation coefficient can be modified according to the laboratory test operation effect, and the embodiment of the present application is not limited to this.

Optionally, determining the target correspondence function as a linear relationship includes: determining a linear function according to the temperature difference and the indoor unit capacity matching number; and determining the linear function as the target correspondence.

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

IULoad＝(rate4*detT+rate5)*IUHP

Among them, IUHP is the indoor unit capacity matching number, rate4 and rate5 are calculation coefficients, and each calculation coefficient can be corrected according to the laboratory test operation effect, which is not limited in the embodiment of the present application.

Optionally, the first-order linear relationship includes a first first-order linear relationship and a second first-order linear relationship. The calculation coefficients of the first first-order linear relationship and the second first-order linear relationship are different.

Optionally, when the temperature difference is in a second temperature difference range, the target corresponding relationship is determined to be a first linear relationship.

Optionally, when the temperature difference range in which the temperature difference is located is a fourth temperature difference range, the target corresponding relationship is determined to be a second first-order linear relationship.

Specifically, the first linear relationship can be set as:

IULoad=(rate4*detT+rate5)*IUHP. Preferably, rate4=0.9 and rate5=1.0 are set.

Set the first linear relationship to be:

IULoad=(rate6*detT+rate7)*IUHP. Preferably, rate6=0.8 and rate7=0.6 are set.

Optionally, in the above step S403, when the temperature difference range in which the temperature difference is located is the third temperature difference range, determining the target corresponding relationship as a fixed value relationship may specifically be: setting IULoad=0.

Optionally, determining the total load of the indoor units of the multi-split air conditioner according to the single load of the indoor unit includes: determining the weight value of the single load of the indoor unit corresponding to each temperature difference; determining the total load of the indoor units according to the single load of the indoor unit and the weight value of the single load of the indoor unit.

As shown in FIG5 , a method for controlling a multi-split air conditioner is provided in an embodiment of the present application. The method can be applied to the multi-split air conditioner shown in FIG1 . The method mainly describes how to control the operation of the outdoor unit according to the total load of the indoor unit. As shown in FIG5 , the method includes:

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

S502: Determine the single-unit load of the indoor unit corresponding to each temperature difference.

S503: Determine the total load of the indoor units of the multi-split air conditioner according to the load of each indoor unit.

S504: Determine the indoor unit total load range in which the indoor unit total load is located;

S505: Adjusting the operating frequency of the outdoor unit according to the indoor unit total load range in which the indoor unit total load is located.

The above method provided in this embodiment divides the total load of the indoor unit into multiple ranges, and each range corresponds to a different adjustment method. According to the actual application scenario, the upper and lower thresholds of the adjustment range, and the corresponding adjustment method, precise control of the outdoor unit frequency can be achieved.

As shown in FIG6 , a method for controlling a multi-split air conditioner is provided in an embodiment of the present application. The method can be applied to the multi-split air conditioner shown in FIG1 . As shown in FIG6 , the method includes:

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

S602: Determine the single-unit load of the indoor unit corresponding to each temperature difference.

S603: Determine the total load of the indoor units of the multi-split air conditioner according to the load of each indoor unit.

S604: Obtaining the actual pressure value of each indoor unit;

S605: Adjust the frequency of the outdoor unit according to the relationship between the actual pressure value and the target pressure value of each indoor unit.

S606: Determine the indoor unit total load range in which the indoor unit total load is located;

S607: Adjust the operating frequency of the outdoor unit according to the indoor unit total load range in which the indoor unit total load is located.

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.

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

When the actual pressure value of each indoor unit is greater than the first pressure threshold, adjusting the operation capacity of the outdoor unit according to the target pressure value;

Alternatively, when the actual pressure value of each indoor unit is less than the second pressure threshold, the operating capacity of the outdoor unit is adjusted to reduce the frequency according to the target pressure value.

Alternatively, when 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 operation of the outdoor unit is controlled according to the total load of the indoor units.

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.

Specifically, the above process can be expressed as follows: when the air conditioner is in cooling mode, if the actual Ps> target Ps+threshold 4: adjust the outdoor unit operation capacity to increase the frequency according to the target Ps; if the actual Ps<target Ps-threshold 5: adjust the outdoor unit operation capacity to decrease the frequency according to the target Ps, where the target Ps is the target pressure value and the actual Ps is the actual pressure value. In this way, the operation capacity can be increased when the actual pressure value is large, and the operation capacity can be reduced when the actual pressure value is small, further improving the operating efficiency of the outdoor unit.

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

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

When the actual pressure value of each indoor unit is less than the third pressure threshold, adjusting the operation capacity of the outdoor unit according to the target pressure value;

Alternatively, when the actual pressure value of each indoor unit is greater than the fourth pressure threshold, the operating capacity of the outdoor unit is adjusted to reduce the frequency according to the target pressure value.

Alternatively, when 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 operation of the outdoor unit is controlled according to the total load of the indoor units.

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

Specifically, the above process can be expressed as follows: when the air conditioner is in cooling mode, when the actual Pd < target Pd - threshold 8: adjust the outdoor unit's operating capacity to increase the frequency according to the target Pd; when the actual Pd > target Pd + threshold 9: adjust the outdoor unit's operating capacity to decrease the frequency according to the target Pd, where the actual Pd is the actual pressure value and the target Pd is the target pressure value. In this way, the operating capacity can be increased when the actual pressure value is large, and the operating capacity can be reduced when the actual pressure value is small, further improving the operating efficiency of the outdoor unit.

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

Optionally, the operating frequency of the outdoor unit is adjusted according to the indoor unit total load range of the indoor unit total load, including: when the indoor unit total load range of the indoor unit total load is within the first indoor unit total load range, increasing the operating frequency of the outdoor unit; when the indoor unit total load range of the indoor unit total load is within the second indoor unit total load range, maintaining the operating frequency of the outdoor unit; when the indoor unit total load range of the indoor unit total load is within the third indoor unit total load range, reducing the operating 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.

In this way, the total load range of the first indoor unit to the total load range of the third indoor unit changes from small to large, that is, when the total load of the indoor units is small, it means that the capacity of the outdoor unit is insufficient and the capacity of the outdoor unit needs to be increased. When the capacity of the indoor units is balanced, in order to achieve energy saving, the current operating capacity is maintained. When the load of the indoor units is large, it means that the capacity of the outdoor units is excessive, and the capacity of the outdoor units can be appropriately reduced, for example, the frequency can be reduced within a specified time. Through hierarchical outdoor unit control and adjustment, the outdoor unit can be accurately controlled and the control accuracy can be improved.

Optionally, the upper threshold of the total load of the first indoor units is equal to the lower threshold of the total load of the second indoor units, and the upper threshold of the total load of the second indoor units is equal to the lower threshold of the total load of the third indoor units.

In conjunction with FIG. 7 , a method for controlling a multi-split air conditioner is provided in an embodiment of the present application. The method can be applied to the multi-split air conditioner shown in FIG. 1 . As shown in FIG. 7 , the method includes:

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

S702: Determine the single-unit load of the indoor unit corresponding to each temperature difference.

S703: Determine the total load of the indoor units of the multi-split air conditioner according to the load of each indoor unit.

S704: Determine the indoor unit total load range in which the indoor unit total load is located;

S705: Adjust the operating frequency of the outdoor unit according to the indoor unit total load range in which the indoor unit total load is located.

S706: When the indoor unit total load range of the indoor unit total load is within the second indoor unit total load range, adjust the opening of the expansion valve corresponding to each indoor unit.

In this way, the total load range of the indoor units is the second total load range of the indoor units, indicating that the current total load of the indoor units meets the demand and the operation capacity of the outdoor units remains unchanged. At this time, the refrigerant is distributed among the indoor units by adjusting the opening of the expansion valves of the indoor units to meet the load requirements of the indoor units.

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

Optionally, the target adjustment strategy corresponding to the temperature difference may be determined according to the following method:

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

(2) when the temperature difference is greater than or equal to the first temperature difference threshold and less than the second temperature difference threshold, determining the target adjustment strategy to be the maintenance strategy;

(3) When the temperature difference is greater than or equal to the second temperature difference threshold, determining the target adjustment strategy as the automatic adjustment strategy; wherein the first temperature difference threshold is less than the second temperature difference threshold.

In this embodiment, when the temperature difference is small, it means that the load demand of the indoor unit has been met. At this time, the opening can be reduced to ensure the effect of other indoor units, that is, to allow more refrigerant to flow to other indoor units. Energy saving is thereby achieved and control efficiency is improved. If the temperature difference is in a balanced state, it means that the current load of the indoor unit is in a balanced state and there is no need to change the opening value. If the temperature difference is too high, it means that the temperature difference has little effect on the load. At this time, the expansion valve needs to be automatically adjusted based on other parameters of the air conditioner. Specifically, it can be based on the indoor unit coil temperature, superheat, etc. In this way, by controlling the opening in levels, precise control of the indoor unit expansion valve is achieved, which not only saves energy, but also prevents invalid control and improves control accuracy.

Specifically, the method for controlling the opening degree of the expansion valve of each indoor unit can be set as follows: (detT represents the temperature difference)

(1) detT ≥ threshold 2: automatic control, such as normal control based on the indoor unit coil temperature, superheat, etc.

(2) 0≤detT<Threshold 2: The expansion valve opening remains unchanged at the current value.

(3) Threshold 3 ≤ detT < 0: The load demand of this indoor unit has been met. To ensure the performance of other indoor units, the expansion valve opening of this indoor unit is reduced by a fixed value, such as 5 pls per minute.

(4) detT<Threshold 3: The load demand of the indoor unit has been oversatisfied, so the expansion valve opening adjustment is accelerated.

Optionally, the method further comprises: when the temperature difference is less than a first temperature difference threshold, adjusting a speed at which the opening degree is reduced based on the temperature difference.

Optionally, the speed of reducing the opening degree is adjusted based on the temperature difference, including: if the temperature difference of the indoor unit is less than a threshold value 3, reducing the opening degree at a first speed; or, if the temperature difference of the indoor unit is between a threshold value 3 and 0, reducing the opening degree at a second speed; wherein the first speed is less than the second speed.

Preferably, the above threshold 2>0>threshold 3.

In the above embodiment, when the temperature difference is small, it means that the demand is basically met and only the opening degree needs to be reduced. When the temperature difference continues to decrease, it means that the load of the indoor unit has been transitionally satisfied and the opening degree needs to be reduced faster. Specifically, the first speed can be to reduce the speed according to a fixed value, for example, set to reduce 5pls per minute. The second speed can be to reduce the speed according to a linear relationship, for example, the value downVal is reduced for a specified time (such as 20 seconds) = (rate8*detT+rate9)*PerMAXPLS, and downVal<=PerMAXPLS is satisfied. PerMAXPLS is the maximum opening of the indoor unit expansion valve adjusted each time, such as 20pls.

As shown in FIG8 , an embodiment of the present application provides a device 800 for controlling a multi-split air conditioner, including a processor 100 and a memory 101. Optionally, the device may also include a communication interface 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other through the bus 103. The communication interface 102 may be used for information transmission. The processor 100 may call the logic instructions in the memory 101 to execute the method for controlling a multi-split air conditioner described in any of the above embodiments.

In addition, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and when sold or used as independent products, may be stored in a computer-readable storage medium.

The memory 101 is a computer-readable storage medium that can be used to store software programs and computer executable programs, such as program instructions/modules corresponding to the method in the embodiment of the present application. The processor 100 executes the functional application and data processing by running the program instructions/modules stored in the memory 101, that is, the method for controlling the multi-split air conditioner in the above embodiment is implemented.

The memory 101 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 101 may include a high-speed random access memory and may also include a non-volatile memory.

As shown in FIG9 , a multi-split air conditioner 900 provided for an embodiment of the present application includes: an outdoor unit 901; a plurality of indoor units 902 connected to the outdoor unit; and a device 800 for controlling the multi-split air conditioner as shown in FIG8 , which is installed in the outdoor unit 901 or the indoor unit 902. The installation relationship described here 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, etc. It can be understood by those skilled in the art that the device 800 for controlling the multi-split air conditioner can be adapted to a feasible multi-split air conditioner, thereby realizing other feasible embodiments.

An embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the method for controlling a multi-split air conditioner according to the above embodiment.

An embodiment of the present application provides a computer program product, which includes a computer program stored on a computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the method for controlling a multi-split air conditioner in the above embodiment.

The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

The technical solution of the embodiment of the present application can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present application. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes, or a transient storage medium.

The above description and accompanying drawings fully illustrate the embodiments of the present application so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and/or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and/or comprising refer to the presence of stated features, wholes, steps, operations, elements, and/or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and/or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods to implement the described functions for each specific application, but such implementations should not be considered to exceed the scope of the embodiments of the present application. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

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

The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the function marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two continuous boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two continuous operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and/or flowcharts, and combinations of blocks in the block diagrams and/or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims (10)

1. A method for controlling a multi-split air conditioner, wherein the multi-split air conditioner comprises an outdoor unit and a plurality of indoor units connected with the outdoor unit; the method comprises the following steps:

obtaining a temperature difference between the actual temperature and the set temperature of each indoor unit;

Determining the single load of the indoor unit corresponding to each temperature difference;

Determining the indoor unit total machine load of the multi-split air conditioner according to the indoor unit single machine load;

and controlling the operation of the outdoor unit based on the load of the indoor unit.

2. The method of claim 1, wherein determining the indoor unit individual load corresponding to each temperature difference comprises:

Determining a temperature difference range in which the temperature difference is located;

determining a target corresponding relation between the single load of the indoor unit and the temperature difference according to a temperature difference range where the temperature difference is located;

and determining the single-machine load of the indoor unit corresponding to each temperature difference based on the target corresponding relation.

3. The method of claim 2, wherein determining the target correspondence between the indoor unit load and the temperature difference according to the temperature difference range in which the temperature difference is located comprises:

under the condition that the temperature difference range where the temperature difference is located is the first temperature difference range, determining that the target corresponding relationship is a quadratic curve relationship;

Under the condition that the temperature difference range where the temperature difference is located is a second temperature difference range, determining that the target corresponding relationship is a primary linear relationship;

Under the condition that the temperature difference range where the temperature difference is located is a third temperature difference range, determining that the target corresponding relation is a constant value relation;

Under the condition that the temperature difference range where the temperature difference is located is a fourth temperature difference range, determining that the target corresponding relationship is a primary linear relationship;

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

4. A method according to claim 3, wherein determining that the target correspondence is a conic relationship comprises:

determining a quadratic function according to the square of the temperature difference, the temperature difference and the indoor function matching number;

And determining the quadratic function as a target corresponding relation.

5. The method of any one of claims 1 to 4, wherein controlling the operation of the outdoor unit based on the indoor unit load comprises:

determining the indoor unit total machine load range in which the indoor unit total machine load is positioned;

And adjusting the operating frequency of the outdoor unit according to the indoor unit total machine load range in which the indoor unit total machine load is positioned.

6. The method of claim 5, wherein adjusting the operating frequency of the outdoor unit according to the indoor unit load range in which the indoor unit load is located, comprises:

Under the condition that the indoor unit total machine load range where the indoor unit total machine load is located is the first indoor unit total machine load range, the operating frequency of the outdoor unit is improved;

Maintaining the operating frequency of the outdoor unit when the indoor unit load range where the indoor unit load is located is the second indoor unit load range;

Reducing the operating frequency of the outdoor unit under the condition that the indoor unit total machine load range where the indoor unit total machine load is located is the third indoor unit total load range; the upper limit threshold of the first indoor unit total machine load is smaller than or equal to the lower limit threshold of the second indoor unit total machine load, and the upper limit threshold of the second indoor unit total machine load is smaller than or equal to the lower limit threshold of the third indoor unit total machine load.

7. The method of claim 6, wherein the upper threshold value of the total load of the first indoor unit is equal to the lower threshold value of the total load of the second indoor unit, and the upper threshold value of the total load of the second indoor unit is equal to the lower threshold value of the total load of the third indoor unit.

8. The method of claim 6, wherein controlling the operation of the outdoor unit based on the indoor unit load, further comprises:

And adjusting the opening of the expansion valve corresponding to each indoor unit under the condition that the indoor unit total machine load range where the indoor unit total machine load is positioned is the second indoor unit total machine load range.

9. An apparatus for controlling a multi-split air conditioner comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for controlling a multi-split air conditioner of any one of claims 1 to 8 when executing the program instructions.

10. A multi-split air conditioner, comprising:

An outdoor unit;

A plurality of indoor units connected to the outdoor unit;

the apparatus for controlling a multi-split air conditioner as claimed in claim 9, installed at an outdoor unit or an indoor unit.