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

Abstract

The application discloses a kind of multi-connected air conditioner control method, multi-connected air conditioner and readable storage medium.The method includes: obtaining the operation load information and low-pressure evaporation temperature of multi-connected air conditioner;According to the operation load information, determine the target evaporation temperature of multi-connected air conditioner;According to the target evaporation temperature and low-pressure evaporation temperature, adjust the operating frequency of the compressor of the multi-connected air conditioner.The application selects corresponding target evaporation temperature according to the operation load information of indoor unit, and controls the operating frequency of the compressor of multi-connected air conditioner based on the target evaporation, so as to solve the problem that the low-pressure evaporation temperature of outdoor unit cannot accurately feedback the evaporation temperature of indoor unit, resulting in the deviation of refrigeration output, improve the accuracy of refrigeration output.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to a multi-split air conditioner control method, a multi-split air conditioner and a computer readable storage medium. BACKGROUND

[0002] With the development of economy and technology, air conditioners are increasingly widely used, and the functions of air conditioners are increasingly diversified. At present, a multi-split air conditioner system is usually composed of one outdoor unit and multiple indoor units. However, during the refrigeration operation, due to the pressure drop of system pipelines and components, the low-pressure evaporation temperature collected by the low-pressure sensor of the outdoor unit cannot accurately reflect the actual evaporation temperature of the indoor unit, thereby causing the refrigeration output to deviate, such as insufficient refrigeration or excessive refrigeration. SUMMARY

[0003] The main purpose of the present application is to provide a multi-split air conditioner control method, a multi-split air conditioner and a computer readable storage medium, which aims to solve the problem that the low-pressure evaporation temperature of the outdoor unit cannot accurately reflect the evaporation temperature of the indoor unit, resulting in deviation of the refrigeration output, and improve the accuracy of the refrigeration output.

[0004] To achieve the above purpose, the present application provides a multi-split air conditioner control method, which comprises the following steps:

[0005] Obtaining the running load information and the low-pressure evaporation temperature of the multi-split air conditioner;

[0006] According to the running load information, determining the target evaporation temperature of the multi-split air conditioner;

[0007] According to the target evaporation temperature and the low-pressure evaporation temperature, adjusting the running frequency of the compressor of the multi-split air conditioner.

[0008] Optionally, the running load information includes a running load value and a load change trend, and the step of determining the target evaporation temperature of the multi-split air conditioner according to the running load information comprises:

[0009] According to the running load value, determining a candidate evaporation temperature;

[0010] According to the load change trend and the candidate evaporation temperature, determining the target evaporation temperature.

[0011] Optionally, the multi-split air conditioner comprises an outdoor unit and multiple indoor units, and the running load value comprises a capacity ratio value between the effective total capacity of the indoor units that have been enabled and the nominal capacity of the outdoor unit; and the step of determining a candidate evaporation temperature according to the running load value comprises:

[0012] comparing the capacity ratio value with the pre-stored ratio value interval to determine a current ratio value interval in which the capacity ratio value is located;

[0013] obtaining a first candidate evaporating temperature and a second candidate evaporating temperature corresponding to the current ratio value interval as the candidate evaporating temperature according to the current ratio value interval and a preset mapping relationship between the ratio value interval and the candidate evaporating temperature.

[0014] Optionally, the step of determining the target evaporating temperature according to the load change trend and the candidate evaporating temperature comprises:

[0015] when the load change trend is a downward trend, the first candidate evaporating temperature is taken as the target evaporating temperature;

[0016] when the load change trend is an upward trend, the second candidate evaporating temperature is taken as the target evaporating temperature, wherein the second candidate evaporating temperature is smaller than the first candidate evaporating temperature.

[0017] Optionally, the step of determining the target evaporating temperature of the multi-split air conditioner according to the operating load information comprises:

[0018] judging whether the operating load value is greater than or equal to a preset load upper limit value;

[0019] if the operating load value is greater than or equal to the preset load upper limit value, a preset minimum target evaporating temperature corresponding to the preset load upper limit value is taken as the target evaporating temperature.

[0020] Optionally, the step of determining the target evaporating temperature of the multi-split air conditioner according to the operating load information further comprises:

[0021] judging whether the operating load value is less than a preset load lower limit value;

[0022] if the operating load value is less than the preset load lower limit value, a preset maximum target evaporating temperature corresponding to the preset load lower limit value is taken as the target evaporating temperature.

[0023] Optionally, the multi-split air conditioner comprises an outdoor unit and a plurality of indoor units, and the steps of obtaining the operating load information and the low-pressure evaporating temperature of the multi-split air conditioner comprise:

[0024] detecting an operating state of the indoor unit, the operating state comprising enabled and disabled;

[0025] obtaining an operating total capacity of the indoor unit whose operating state is enabled and a nominal capacity of the outdoor unit, and calculating a capacity ratio value between the operating total capacity and the nominal capacity as the operating load information;

[0026] Collecting a low-pressure evaporation pressure of the outdoor unit, and obtaining a corresponding low-pressure evaporation temperature according to the low-pressure evaporation pressure.

[0027] Optionally, the step of adjusting the operation frequency of the compressor of the multi-connected air conditioner according to the target evaporation temperature and the low-pressure evaporation temperature comprises:

[0028] When the low-pressure evaporation temperature is higher than the target evaporation temperature, increasing the operation frequency of the compressor of the multi-connected air conditioner according to the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature;

[0029] When the low-pressure evaporation temperature is lower than the target evaporation temperature, decreasing the operation frequency of the compressor of the multi-connected air conditioner according to the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature.

[0030] In addition, to achieve the above-mentioned purpose, the application further provides a multi-connected air conditioner, comprising an outdoor unit and a plurality of indoor units, further comprising a low-pressure sensor, a memory, a processor and a multi-connected air conditioner control program stored in the memory and executable on the processor, and the processor implements the method of any one of the above-mentioned methods when executing the multi-connected air conditioner control program.

[0031] In addition, to achieve the above-mentioned purpose, the application further provides a computer readable storage medium, which stores a multi-connected air conditioner control program, and the multi-connected air conditioner control program implements the method of any one of the above-mentioned methods when executed by a processor.

[0032] The application provides a multi-connected air conditioner control method, which can determine the load condition of the multi-connected air conditioner by obtaining the operation load information of the multi-connected air conditioner and the collected low-pressure evaporation temperature of the outdoor unit. Then, the target evaporation temperature of the multi-connected air conditioner is determined according to the operation load information, the higher the operation load of the multi-connected air conditioner, the greater the system pressure drop, and the lower the collected low-pressure evaporation temperature relative to the actual evaporation temperature of the indoor unit, so the target evaporation temperature can be negatively correlated with the operation load of the multi-connected air conditioner, so that the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature can be close to the actual temperature difference. Finally, the operation frequency of the compressor of the multi-connected air conditioner is adjusted according to the target evaporation temperature and the low-pressure evaporation temperature. Therefore, the target evaporation temperature determined according to the operation load information of the multi-connected air conditioner, and the operation frequency of the compressor controlled based on the target evaporation temperature and the low-pressure evaporation temperature, can avoid the problem that the low-pressure evaporation temperature of the outdoor unit cannot accurately feedback the actual evaporation temperature of the indoor unit, resulting in deviation of the refrigeration output, so that the refrigeration output of the multi-connected air conditioner is also more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A system structure diagram of a multi-split air conditioner involved in the present application;

[0034] Figure 2 A device structure schematic diagram of a hardware operating environment involved in an embodiment scheme of the present application;

[0035] Figure 3 A flow schematic diagram of an embodiment of a multi-split air conditioner control method of the present application;

[0036] Figure 4 A flow schematic diagram of another embodiment of a multi-split air conditioner control method of the present application;

[0037] Figure 5 An example diagram of a mapping relationship between an operating load value and a target evaporation temperature in the present application;

[0038] Figure 6 An example diagram of an implementable embodiment in the present application.

[0039] The implementation of the object, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0040] It should be understood that the specific embodiments described herein are merely intended to explain the present application and not to limit the present application.

[0041] In the prior art, in the process of refrigeration operation of a multi-split air conditioner, a low-pressure sensor of an outdoor unit is usually used to collect pressure values, and then a corresponding low-pressure evaporation temperature is calculated based on the collected pressure values, and then the low-pressure evaporation temperature is taken as the evaporation temperature of an indoor unit, when the low-pressure evaporation temperature is higher than a target evaporation temperature, the frequency of a compressor is increased, and when the low-pressure evaporation temperature is lower than the target evaporation temperature, the frequency of the compressor is decreased, so as to adjust the refrigeration output of the multi-split air conditioner.

[0042] However, there is a system pipeline and component pressure drop in the actual use process, when the number of indoor units opened in the multi-split air conditioner system is different or the capacity of the opened indoor units is different, the refrigerant flow is inconsistent, at this time, the more the number of indoor units opened / the greater the capacity, the greater the system pressure drop, that is, the low-pressure evaporation temperature is lower than the actual evaporation temperature of the indoor unit. Therefore, the above low-pressure evaporation temperature cannot accurately feedback the evaporation temperature of the indoor unit, thereby the refrigeration output deviation such as insufficient refrigeration or excessive refrigeration may occur.

[0043] The present application provides the above-mentioned solution, aiming to solve the problem that the low-pressure evaporation temperature of the outdoor unit cannot accurately feedback the evaporation temperature of the indoor unit, resulting in refrigeration output deviation, and improve the accuracy of the refrigeration output.

[0044] An embodiment of the present application provides a multi-split air conditioner.

[0045] Referring to Figure 1 , Figure 1 is a system structure diagram of a multi-split air conditioner involved in the embodiments of the present application. The multi-split air conditioner system is generally composed of one outdoor unit and multiple indoor units, and four indoor units (i.e., indoor heat exchangers in the figure) are shown in the figure, and of course, more or fewer indoor units can also be included. The multi-split air conditioner can obtain corresponding operation load information by detecting the operation state of the indoor unit, and further calculate corresponding low-pressure evaporation temperature by detecting the low-pressure evaporation pressure of the outdoor unit through a low-pressure sensor. Those skilled in the art can understand that the multi-split air conditioner can include fewer or more components and devices in the system structure diagram, such as an outdoor unit throttling device, an indoor unit throttling device, and the like.

[0046] Referring to Figure 2 , Figure 2 is a device structure diagram of a hardware operating environment involved in the embodiments of the present application.

[0047] As Figure 2 shown, the multi-split air conditioner can include a communication bus 1002, a processor 1001 such as a CPU, a user interface 1003, a network interface 1004, a memory 1005, and a low-pressure sensor 1006. The communication bus 1002 is used to realize the connection and communication between the components. The user interface 1003 can include a display screen (Display) and an input unit such as a keyboard (Keyboard), and the optional user interface 1003 can further include a standard wired interface and a wireless interface. The network interface 1004 can optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 can be a high-speed RAM memory, or a stable memory (non-volatile memory) such as a disk memory. The memory 1005 can optionally be a storage device independent of the aforementioned processor 1001. The low-pressure sensor 1006 is used to collect the low-pressure evaporation temperature of the outdoor unit.

[0048] Those skilled in the art can understand that Figure 2 the multi-split air conditioner structure shown in the figure does not constitute a limitation on the multi-split air conditioner, and can include more or fewer components than shown in the figure, or combine certain components, or different component arrangements.

[0049] In Figure 2The network interface 1004 is mainly used for connecting a background server and communicating data with the background server; the user interface 1003 is mainly used for connecting a client (user end) and communicating data with the client; and the processor 1001 can be used for calling a control program of the air conditioner stored in the memory 1005 and executing the related steps in each embodiment of the control method of the multi-connected air conditioner.

[0050] The application provides a control method of a multi-connected air conditioner, which is applied to the multi-connected air conditioner. Figure 3 , Figure 3 FIG. 1 is a flowchart of an embodiment of the control method of the multi-connected air conditioner, which comprises the following steps:

[0051] In step S100, the running load information and the low-pressure evaporation temperature of the multi-connected air conditioner are obtained.

[0052] Specifically, the running load information can comprise a running load value, such as a total capacity of the running indoor units (i.e. the sum of the capacities of the running indoor units), a capacity ratio of the total capacity to the nominal capacity of the outdoor unit, and / or a running number of the running indoor units, a number ratio of the running number to the total number of the indoor units, etc. The capacity of the running indoor unit can be the rated capacity, and can also be the real-time capacity. In addition, the running load information can also comprise a load change trend, i.e. a change trend of the running load value, such as an upward trend or a downward trend, which can be analyzed through the numerical change information of the running load value, so as to obtain the load change trend. The indoor units of the multi-connected air conditioner can be monitored in real time or in a preset time period, and the above-mentioned running load values of the running indoor units, such as the total capacity, the capacity ratio, the running number, the number ratio, etc., and the corresponding load change trend, etc. of the running load information, and the low-pressure evaporation pressure of the outdoor unit collected by the preset low-pressure sensor, are obtained, and the low-pressure evaporation pressure is converted into the low-pressure evaporation temperature through calculation, so as to obtain the low-pressure evaporation temperature.

[0053] Further, the multi-connected air conditioner comprises an outdoor unit and a plurality of indoor units, and step S100 can comprise the following steps:

[0054] In step S110, the running state of the indoor unit is detected, and the running state comprises running and non-running.

[0055] In step S120, the total capacity of the indoor units in the running state and the nominal capacity of the outdoor unit are obtained, and a capacity ratio between the total capacity and the nominal capacity is calculated as the running load information.

[0056] Step S130, collect the low-pressure evaporation pressure of the outdoor unit, and obtain the corresponding low-pressure evaporation temperature according to the low-pressure evaporation pressure.

[0057] Specifically, the running total capacity of the indoor units that have been enabled can be obtained by detecting the running states of all the indoor units of the multi-split air conditioner, wherein the running states include enabled and disabled. The running total capacity can be the sum of the rated capacities of the indoor units that have been enabled, or the sum of the real-time capacities of the indoor units that have been enabled. Then, the nominal capacity of the outdoor unit of the multi-split air conditioner is obtained, and the capacity ratio between the running total capacity of the indoor units and the nominal capacity of the outdoor unit is calculated. When the capacities of the indoor units are different, it is obvious that there will be a certain error in reflecting the running load condition of the multi-split air conditioner by the number of the indoor units that have been enabled. In this embodiment, the capacity ratio between the running total capacity of the indoor units and the nominal capacity of the outdoor unit is obtained by detecting the running states of the indoor units, which can obviously more accurately reflect the running load condition of the indoor units. Then, the low-pressure evaporation pressure of the outdoor unit can be collected based on a preset low-pressure sensor, and the low-pressure evaporation pressure is converted into the corresponding low-pressure evaporation temperature according to a preset pressure-temperature mapping table.

[0058] Step S200, determine the target evaporation temperature of the multi-split air conditioner according to the running load information;

[0059] Specifically, a mapping relationship between the running load information and the target evaporation temperature can be established in advance, and the target evaporation temperature corresponding to the running load information of the multi-split air conditioner can be obtained through the mapping relationship. For example, a mapping table of one or more than one of the running load values such as the running total capacity, the capacity ratio, the running number, and the number ratio, and the target evaporation temperature can be established in advance, so that the target evaporation temperature corresponding to the running load value in the running load information can be obtained according to the running load value in the running load information and the mapping table established in advance. The target evaporation temperature is negatively correlated with the running load value in the running load information, that is, the higher the running load value, the lower the target evaporation temperature. Therefore, the higher the running load value, the lower the low-pressure evaporation temperature compared with the actual evaporation temperature. By selecting a lower target evaporation temperature, the temperature difference between the collected low-pressure evaporation temperature and the selected target evaporation temperature can be close to the actual temperature difference between the actual evaporation temperature and the target evaporation temperature corresponding thereto, thereby avoiding the problem that the low-pressure evaporation temperature of the multi-split air conditioner is affected by the running load, resulting in a deviation between the calculated temperature difference and the actual temperature difference.

[0060] Step S300, adjust the running frequency of the compressor of the multi-split air conditioner according to the target evaporation temperature and the low-pressure evaporation temperature.

[0061] Specifically, the operation frequency of the compressor of the multi-split air conditioner can be adjusted according to the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature. When the low-pressure evaporation temperature is higher than the target evaporation temperature, the operation frequency of the compressor is increased to enhance the refrigeration output of the multi-split air conditioner; when the low-pressure evaporation temperature is lower than the target evaporation temperature, the operation frequency of the compressor is decreased to weaken the refrigeration output of the multi-split air conditioner. Since the target evaporation temperature is the target evaporation temperature corresponding to the operation load information, the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature is close to the actual temperature difference, so that the adjustment range of the operation frequency of the compressor is more accurate, and thus the refrigeration output of the multi-split air conditioner is more accurate.

[0062] Further, the step S300 further comprises the following steps:

[0063] When the low-pressure evaporation temperature is higher than the target evaporation temperature, the operation frequency of the compressor of the multi-split air conditioner is increased according to the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature.

[0064] When the low-pressure evaporation temperature is lower than the target evaporation temperature, the operation frequency of the compressor of the multi-split air conditioner is decreased according to the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature.

[0065] Specifically, when the low-pressure evaporation temperature is higher than the target evaporation temperature, it indicates that the multi-split air conditioner is insufficiently refrigerated, and thus the operation frequency of the compressor of the multi-split air conditioner needs to be increased according to the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature to enhance the refrigeration output of the multi-split air conditioner. When the low-pressure evaporation temperature is lower than the target evaporation temperature, it indicates that the multi-split air conditioner is excessively refrigerated, and thus the operation frequency of the compressor of the multi-split air conditioner needs to be decreased according to the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature to weaken the refrigeration output of the multi-split air conditioner, so as to adjust the refrigeration output of the multi-split air conditioner. When the low-pressure evaporation temperature is equal to the target evaporation temperature, the operation frequency of the compressor does not need to be adjusted. In this embodiment, the operation frequency of the compressor of the multi-split air conditioner can be adjusted (increased / decreased) by querying a preset frequency correction lookup table according to the temperature difference to obtain a frequency correction value corresponding to the temperature difference, and then obtaining the current operation frequency of the compressor, calculating a target operation frequency according to the frequency correction value and the current operation frequency, and controlling the compressor to operate at the target operation frequency. Of course, the operation frequency of the compressor of the multi-split air conditioner is not limited in this embodiment.

[0066] In an embodiment of the present application, the load condition of the multi-split air conditioner can be determined by obtaining the operation load information of the multi-split air conditioner and the low-pressure evaporation temperature of the outdoor unit. Then, the target evaporation temperature of the multi-split air conditioner can be determined according to the operation load information. The higher the operation load of the multi-split air conditioner is, the greater the system pressure drop is, and the lower the collected low-pressure evaporation temperature is relative to the actual evaporation temperature of the indoor unit. Therefore, the target evaporation temperature can be negatively correlated with the operation load of the multi-split air conditioner, so that the temperature difference between the low-pressure evaporation temperature and the target evaporation temperature can be close to the actual temperature difference. Finally, the operation frequency of the compressor of the multi-split air conditioner can be adjusted according to the target evaporation temperature and the low-pressure evaporation temperature. Therefore, according to the target evaporation temperature determined based on the operation load information of the multi-split air conditioner, and the operation frequency of the compressor controlled based on the target evaporation temperature and the low-pressure evaporation temperature, the problem that the low-pressure evaporation temperature of the outdoor unit cannot accurately reflect the actual evaporation temperature of the indoor unit, resulting in deviation of the refrigeration output, can be avoided, so that the refrigeration output of the multi-split air conditioner is more accurate.

[0067] Further, with reference to Figure 4 , another embodiment of the present application provides a multi-split air conditioner control method based on the above Figure 3 , the step S200 further includes the following steps:

[0068] Step S210, determining a candidate evaporation temperature according to the operation load value.

[0069] Step S220, determining the target evaporation temperature according to the load change trend and the candidate evaporation temperature.

[0070] Specifically, the operation load information can include an operation load value and a load change trend. In this embodiment, the corresponding target evaporation temperature can be selected based on the operation load value and the load change trend (i.e., the change trend of the operation load value). If the operation load information is obtained in real time or in a preset time period, the corresponding load change trend can be obtained by comparing the historical load value at the last moment or in the last period with the current operation load value, wherein the load change trend can include a downward trend and an upward trend. The load change trend can be defaulted to an upward trend when the multi-split air conditioner is initially started.

[0071] The embodiment can pre-store a preset number of continuous load intervals corresponding to preset candidate evaporating temperatures, wherein the number and span of the load intervals can be selected according to specific requirements, and the candidate evaporating temperature can be one or more temperature values. According to the operating load value, the load interval in which the operating load value is located can be determined, and then the target evaporating temperature corresponding to the load interval is taken as the candidate evaporating temperature. When the load change trend is a downward trend, the collected low-pressure evaporating temperature gradually rises, and therefore a higher candidate evaporating temperature can be selected as the target evaporating temperature. When the load change trend is an upward trend, the collected low-pressure evaporating temperature of the outdoor unit gradually decreases, and therefore a lower candidate evaporating temperature can be selected as the target evaporating temperature, so that the changed low-pressure evaporating temperature matches the target evaporating temperature, avoiding the situation that the compressor operating frequency decreases when the operating load rises because the low-pressure evaporating temperature decreases, and the compressor operating frequency increases when the operating load decreases because the low-pressure evaporating temperature rises, and the refrigeration output deviates from the user's refrigeration demand. Of course, when the load change trend is a downward trend, a lower candidate evaporating temperature can also be selected as the target evaporating temperature, and when the load change trend is an upward trend, a higher candidate evaporating temperature can also be selected as the target evaporating temperature, so as to reduce the frequency of target evaporating temperature change.

[0072] In the embodiment, the candidate evaporating temperature is determined according to the operating load value. Then, the target evaporating temperature that matches the low-pressure evaporating temperature change trend is selected from the candidate evaporating temperature according to the load change trend, so as to avoid the situation that the frequency decreases when the number of enabled indoor units and / or the capacity increases, and the frequency increases when the number of enabled indoor units and / or the capacity decreases. In the embodiment, the target evaporating temperature can be selected on the basis of the operating load value in combination with the load change trend, so that the refrigeration output of the multi-split air conditioner matches the user's changing refrigeration demand more.

[0073] Further, step S210 further includes the following steps:

[0074] Step S211, comparing the capacity ratio value with the pre-stored ratio interval, to determine the current ratio interval in which the capacity ratio value is located;

[0075] Step S212, obtaining the first candidate evaporating temperature and the second candidate evaporating temperature corresponding to the current ratio interval as the candidate evaporating temperature according to the mapping relationship between the current ratio interval and the preset ratio interval and the candidate evaporating temperature.

[0076] Specifically, when the operating load information can include a capacity ratio between the total capacity of the indoor unit and the nominal capacity of the outdoor unit. A preset number of continuous ratio intervals can be pre-stored, so that the current ratio interval where the capacity ratio is located can be determined. Then, according to the current ratio interval and the preset mapping relationship between the ratio interval and the candidate evaporating temperature, the first candidate evaporating temperature and the second candidate evaporating temperature corresponding to the current ratio interval can be obtained as the candidate evaporating temperature. Reference Figure 5 , Figure 5 is an example diagram of the mapping relationship between the operating load value and the target evaporating temperature in the present application. The pre-stored ratio interval can be [0, P1% ), [P1%, P2% ), [P2%, P3% ), [P3%, P4% ), [P4%, 100%], and the preset mapping relationship between the ratio interval and the target evaporating temperature can be the corresponding relationship between the end point of each ratio interval and the candidate evaporating temperature, i.e., P1% corresponds to T1, P2% corresponds to T2, P3% corresponds to T3, and P4% corresponds to T4. Therefore, the corresponding candidate evaporating temperature can be obtained through the current ratio interval. For example, when the capacity ratio corresponds to the ratio interval [P1%, P2% ), the first candidate evaporating temperature T1 and the second candidate evaporating temperature T2 corresponding to the ratio interval can be obtained.

[0077] Further, step S220 further includes the following steps:

[0078] Step S221, when the load change trend is a downward trend, the first candidate evaporating temperature is taken as the target evaporating temperature.

[0079] Step S222, when the load change trend is an upward trend, the second candidate evaporating temperature is taken as the target evaporating temperature, wherein the second candidate evaporating temperature is smaller than the first candidate evaporating temperature.

[0080] Specifically, the second candidate evaporation temperature is less than the first candidate evaporation temperature. When the load change trend is a downward trend (such as the number of indoor units enabled or the capacity of the indoor units is reduced, etc.), because the system pressure drop decreases, the low-pressure evaporation temperature of the outdoor unit gradually increases, and therefore, a higher candidate evaporation temperature (i.e., the first candidate evaporation temperature) can be selected from the candidate evaporation temperatures as the target evaporation temperature. Thus, the temperature difference between the low-pressure evaporation temperature and the previous target evaporation temperature is prevented from increasing due to the gradual increase of the low-pressure evaporation temperature, which leads to the situation that the compressor frequency increases and the cooling output of the multi-split air conditioner is greater than the user's reduced cooling demand. When the load change trend is an upward trend (such as the number of indoor units enabled and / or the capacity of the indoor units is increased, etc.), because the system pressure drop increases, the low-pressure evaporation temperature of the outdoor unit gradually decreases, and therefore, a lower candidate evaporation temperature (i.e., the second candidate evaporation temperature) can be selected from the candidate evaporation temperatures as the target evaporation temperature. Thus, the temperature difference between the low-pressure evaporation temperature and the previous target evaporation temperature is prevented from decreasing due to the gradual decrease of the low-pressure evaporation temperature, which leads to the situation that the compressor frequency decreases and the cooling output of the multi-split air conditioner is less than the user's increased cooling demand.

[0081] In the embodiment, when the load change trend is a downward trend, the first candidate evaporation temperature (i.e., the higher candidate evaporation temperature) is selected as the target evaporation temperature; and when the load change trend is an upward trend, the second candidate evaporation temperature (i.e., the lower candidate evaporation temperature) is selected as the target evaporation temperature. By selecting the target evaporation temperature according to the load change trend on the basis of the operating load value, the cooling output of the multi-split air conditioner is more matched to the user's changing cooling demand.

[0082] Further, in another embodiment, the step S200 further comprises the following steps:

[0083] In step S230, it is determined whether the operating load value is greater than or equal to a preset upper load limit value.

[0084] In step S231, if the operating load value is greater than or equal to the preset upper load limit value, a preset minimum target evaporation temperature corresponding to the preset upper load limit value is selected as the target evaporation temperature.

[0085] Specifically, the preset load upper limit value can be an upper limit of the operating load value set by the manufacturer in advance according to specific requirements or experience. Taking a capacity ratio as an example, the preset load upper limit value can be 75%, 80%, 85%, etc. When the operating load value reaches or exceeds the preset load upper limit value, the preset minimum target evaporation temperature corresponding to the preset load upper limit value can be directly used as the target evaporation temperature. The preset minimum target evaporation temperature is the minimum target evaporation temperature corresponding to the preset load upper limit value. When the operating load value reaches or exceeds the preset load upper limit value, it indicates that the system pressure drop of the multi-split air conditioner is extremely large at this time, and therefore the low-pressure evaporation temperature of the outdoor unit is much lower than the actual evaporation temperature of the indoor unit. Therefore, the preset minimum target evaporation temperature can be selected as the target evaporation temperature to ensure that the cooling output of the multi-split air conditioner can match the higher cooling demand of the user, and at the same time, the target evaporation temperature does not need to be frequently adjusted when the operating load value reaches or exceeds the preset load upper limit value, thereby improving the convenience of control of the multi-split air conditioner.

[0086] Further, in another embodiment, step S200 further includes the following steps:

[0087] Step S240, determining whether the operating load value is less than a preset load lower limit value.

[0088] Step S241, if the operating load value is less than the preset load lower limit value, using the preset maximum target evaporation temperature corresponding to the preset load lower limit value as the target evaporation temperature.

[0089] Specifically, the preset load lower limit value can be a lower limit of the operating load value set by the manufacturer in advance according to specific requirements or experience. Taking a capacity ratio as an example, the preset load lower limit value can be 50%, 40%, 30%, etc. When the operating load value is lower than the preset load upper limit value, the preset maximum target evaporation temperature corresponding to the preset load lower limit value can be directly used as the target evaporation temperature. The preset maximum target evaporation temperature is the maximum target evaporation temperature corresponding to the preset load lower limit value. When the operating load value is lower than the preset load lower limit value, it indicates that the system pressure drop of the multi-split air conditioner is relatively small at this time, and therefore the difference between the low-pressure evaporation temperature of the outdoor unit and the actual evaporation temperature of the indoor unit is small, and the low-pressure evaporation temperature of the outdoor unit can be used as the actual evaporation temperature of the indoor unit. Therefore, the preset maximum target evaporation temperature can be selected as the target evaporation temperature, and the target evaporation temperature does not need to be frequently adjusted, thereby improving the convenience of control of the multi-split air conditioner.

[0090] In addition, with reference to Figure 6 , Figure 6As an example of an embodiment of the present application, a diagram is shown. In this embodiment, the operating load value is the ratio of the capacity of the indoor unit that is needed (i.e., the total capacity of the indoor units that are enabled) to the nominal capacity of the outdoor unit. When the ratio is greater than or equal to 75%, the target evaporating temperature selected is Ae1; when the ratio is less than 50%, the target evaporating temperature selected is Ae; and when the ratio is less than 75% and greater than or equal to 50%, the trend of the ratio is further determined. If the trend of the ratio is an upward trend, the target evaporating temperature selected is Ae1; and if the trend of the ratio is a downward trend, the target evaporating temperature selected is Ae. In the above, Ae1 < Ae.

[0091] In addition, an embodiment of the present application also provides a computer readable storage medium, and the computer readable storage medium stores a multi-connected air conditioner control program. The multi-connected air conditioner control program is executed by a processor to realize the related steps of any one of the above multi-connected air conditioner control methods.

[0092] It should be noted that, in this document, the terms "comprising", "containing", or any other similar term are intended to encompass non-exclusive inclusions, such that a process, method, article, or system that comprises a list of elements does not only include those elements, but also includes other elements not explicitly listed, or further includes elements inherent in such a process, method, article, or system. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or system that includes the element.

[0093] The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0094] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be realized by means of software and a general hardware platform, of course, they can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, an optical disk) as described above, and includes a plurality of instructions for causing a terminal device (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in the various embodiments of the present application.

[0095] The above is only a preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A multi-split air conditioner control method, characterized in that, The multi-split air conditioner comprises an outdoor unit and a plurality of indoor units, and the method comprises the following steps: Obtaining the running load information and the low-pressure evaporation temperature of the multi-split air conditioner; According to the running load information, determining the target evaporation temperature of the multi-split air conditioner; According to the target evaporation temperature and the low-pressure evaporation temperature, adjusting the running frequency of the compressor of the multi-split air conditioner; The running load information comprises a running load value and a load change trend, and the step of determining the target evaporation temperature of the multi-split air conditioner according to the running load information comprises: According to the running load value, determining a candidate evaporation temperature; According to the load change trend and the candidate evaporation temperature, determining the target evaporation temperature; The running load value comprises a capacity ratio value between the effective total capacity of the indoor units that have been enabled and the nominal capacity of the outdoor unit; the step of determining the candidate evaporation temperature according to the running load value comprises: Comparing the capacity ratio value with a pre-stored ratio value interval to determine the current ratio value interval in which the capacity ratio value is located; According to the current ratio value interval and a pre-set mapping relationship between the ratio value interval and the candidate evaporation temperature, obtaining the first candidate evaporation temperature and the second candidate evaporation temperature corresponding to the current ratio value interval as the candidate evaporation temperature.

2. The control method of a multi VRF air conditioner according to claim 1, wherein, The step of determining the target evaporation temperature according to the load change trend and the candidate evaporation temperature comprises: When the load change trend is a downward trend, the first candidate evaporation temperature is taken as the target evaporation temperature; When the load change trend is an upward trend, the second candidate evaporation temperature is taken as the target evaporation temperature, wherein the second candidate evaporation temperature is smaller than the first candidate evaporation temperature.

3. The control method of a packaged air conditioner according to claim 1, wherein The step of determining the target evaporation temperature of the multi-split air conditioner according to the running load information comprises: Judging whether the running load value is greater than or equal to a pre-set upper load limit value; If the running load value is greater than or equal to the pre-set upper load limit value, a pre-set minimum target evaporation temperature corresponding to the pre-set upper load limit value is taken as the target evaporation temperature.

4. The control method of a packaged air conditioner according to claim 1, wherein The step of determining the target evaporation temperature of the multi-split air conditioner according to the running load information further comprises: Judging whether the running load value is less than a pre-set lower load limit value; If the running load value is less than the pre-set lower load limit value, a pre-set maximum target evaporation temperature corresponding to the pre-set lower load limit value is taken as the target evaporation temperature.

5. The control method of a packaged air conditioner according to claim 1, wherein The multi-split air conditioner comprises an outdoor unit and a plurality of indoor units, and the step of obtaining the running load information and the low-pressure evaporation temperature of the multi-split air conditioner comprises: Detecting the running state of the indoor units, which comprises enabled and disabled; Obtaining the running total capacity of the indoor units in the enabled state and the nominal capacity of the outdoor unit, and calculating the capacity ratio value between the running total capacity and the nominal capacity as the running load information; Collecting the low-pressure evaporation pressure of the outdoor unit, and obtaining the corresponding low-pressure evaporation temperature according to the low-pressure evaporation pressure.

6. The control method of a multi VRF air conditioner according to any one of claims 1 to 5, wherein, The step of adjusting the running frequency of the compressor of the multi-split air conditioner according to the target evaporation temperature and the low-pressure evaporation temperature comprises: when the low-pressure evaporation temperature is higher than the target evaporation temperature, increasing the compressor operating frequency of the multi-split air conditioner according to a temperature difference between the low-pressure evaporation temperature and the target evaporation temperature; when the low-pressure evaporation temperature is lower than the target evaporation temperature, decreasing the compressor operating frequency of the multi-split air conditioner according to a temperature difference between the low-pressure evaporation temperature and the target evaporation temperature.

7. A multi-split air conditioner, characterized in that, The multi-split air conditioner comprises an outdoor unit and a plurality of indoor units, and further comprises a low-pressure sensor, a memory, a processor, and a multi-split air conditioner control program stored in the memory and executable in the processor, and the processor implements the method of any one of claims 1 to 6 when executing the multi-split air conditioner control program.

8. A computer-readable storage medium, characterized in that, A storage medium having stored thereon a multi-split air conditioner control program, which implements the method of any one of claims 1 to 6 when executed by a processor.

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