A multi-split system

Abstract

The application discloses a multi-connected system, comprising an outdoor unit and at least two indoor units, the indoor unit comprising an indoor environment temperature detection module and an air outlet temperature detection module, after the outdoor unit is started and enters a normal control stage or the indoor unit is started, the indoor environment temperature Ti and the air outlet temperature To are obtained, the running state level of the indoor unit is determined according to the time when |indoor environment temperature Ti-air outlet temperature To| meets a set condition, and the opening degree of the indoor electronic expansion valve is adjusted according to the running state level of the indoor unit and |indoor environment temperature Ti-air outlet temperature To|. Thus, the multi-connected system can quickly adjust the running capacity of the indoor unit according to the running state level of the indoor unit and the current running parameter, so that the running capacity of the indoor unit is quickly matched with the room load demand, the user demand is quickly met, and the user experience is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a multi-split air conditioning system. Background Technology

[0002] The insulation performance of buildings in China varies, and the installation environment of multi-split air conditioning systems is also different. In multi-split air conditioning systems, due to the complex installation environment outside the site, even if all indoor units are in one system, the indoor unit capacity may not match the load demand of the room when the system is turned on, due to the different height differences between indoor units and the different pipe lengths. This will bring different experiences to users.

[0003] In addition, special circumstances such as open windows in rooms can also have an impact, causing rooms that were originally load-matched to have indoor unit capacity that is less than the room's demand, and indoor units that respond slowly. As a result, the indoor unit's capacity is insufficient during the startup phase, and it cannot meet user needs as quickly as possible, thus affecting the user experience.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] This invention proposes a multi-split air conditioning system that solves the technical problem that the capacity of indoor units in existing multi-split air conditioning systems is affected by the current room load, making it impossible to quickly meet user needs and affecting user experience.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution: A multi-split air conditioning system includes an outdoor unit and at least two indoor units. Each indoor unit includes an indoor ambient temperature detection module and an outlet air temperature detection module. After the outdoor unit is turned on and enters the normal control phase, or after the indoor unit is turned on, the system acquires the indoor ambient temperature Ti and the outlet air temperature To. The system determines the operating status level of the indoor unit based on the time it takes for |Indoor Ambient Temperature Ti - Outlet Air Temperature To| to meet a set condition. The system adjusts the opening of the indoor electronic expansion valve based on the operating status level of the indoor unit and |Indoor Ambient Temperature Ti - Outlet Air Temperature To|.

[0007] In some embodiments of this application, the multi-split air conditioning system includes a set temperature acquisition module for acquiring a set temperature Ts. When |set temperature Ts - indoor ambient temperature Ti| exceeds a set temperature threshold, the opening of the indoor electronic expansion valve is adjusted according to the operating status level of the indoor unit and |indoor ambient temperature Ti - outlet air temperature To|.

[0008] In some embodiments of this application, the conditions for adjusting the opening of the indoor electronic expansion valve according to the operating status level of the indoor unit when the indoor unit is in cooling mode also include the difference between the compressor discharge temperature and the system pressure saturation temperature Tdsh exceeding a set difference, and the indoor unit coil temperature test value Tc exceeding a set test value.

[0009] In some embodiments of this application, the opening degree of the indoor electronic expansion valve is negatively correlated with |indoor ambient temperature Ti - outlet air temperature To|.

[0010] In some embodiments of this application, the outdoor unit includes an outdoor ambient temperature detection module, which acquires the outdoor ambient temperature Ta after the outdoor unit is turned on and enters the normal control phase or after the indoor unit is turned on and a set time is set, and determines the set conditions based on the outdoor ambient temperature Ta.

[0011] In some embodiments of this application, when the indoor unit is in cooling mode, if the outdoor ambient temperature Ta exceeds the set cooling outdoor ambient temperature, the setting condition includes a first setting value; if the outdoor ambient temperature Ta does not exceed the set cooling outdoor ambient temperature, the setting condition includes a second setting value, and the first setting value is less than the second setting value. When the indoor unit is in heating mode, if the outdoor ambient temperature Ta exceeds the set heating outdoor ambient temperature, the setting condition includes a third setting value; if the outdoor ambient temperature Ta does not exceed the set heating outdoor ambient temperature, the setting condition includes a fourth setting value, and the third setting value is greater than the fourth setting value.

[0012] In some embodiments of this application, the opening degree of the indoor electronic expansion valve is related to the outdoor ambient temperature Ta and |indoor ambient temperature Ti - outlet air temperature To|.

[0013] In some embodiments of this application, as the operating status level of the indoor unit deteriorates, the opening degree of the indoor electronic expansion valve increases at least within the same outdoor ambient temperature range and the range of |indoor ambient temperature Ti - outlet air temperature To|.

[0014] In some embodiments of this application, when the indoor unit is in cooling mode, a target value SH correction value for the temperature difference between the gas pipe and liquid pipe of the indoor unit is determined based on the operating status level of the indoor unit, the outdoor ambient temperature, and |indoor ambient temperature Ti - outlet air temperature To|, and the opening of the indoor electronic expansion valve is adjusted according to the SH correction value; when the indoor unit is in heating mode, a target value SC correction value for the temperature difference between the system pressure saturation temperature and the liquid pipe coil temperature of the indoor unit is determined based on the operating status level of the indoor unit, the outdoor ambient temperature, and |indoor ambient temperature Ti - outlet air temperature To|, and the opening of the indoor electronic expansion valve is adjusted according to the SC correction value.

[0015] In some embodiments of this application, the change in opening of the indoor electronic expansion valve is equal to the correction value multiplied by the correction coefficient.

[0016] Compared with existing technologies, the advantages and positive effects of this invention are as follows: A multi-split air conditioning system includes an outdoor unit and at least two indoor units. Each indoor unit includes an indoor ambient temperature detection module and an outlet air temperature detection module. After the outdoor unit starts up and enters the normal control phase, or after the indoor unit starts up, it acquires the indoor ambient temperature Ti and the outlet air temperature To. Based on the time it takes for |Indoor Ambient Temperature Ti - Outlet Air Temperature To| to meet a set condition, it determines the operating status level of the indoor unit. Based on the operating status level of the indoor unit and |Indoor Ambient Temperature Ti - Outlet Air Temperature To|, it adjusts the opening of the indoor electronic expansion valve. Therefore, the multi-split air conditioning system determines the operating status level of the indoor unit based on the time it takes for |Indoor Ambient Temperature Ti - Outlet Air Temperature To| to meet the set condition, and quickly adjusts the opening of the indoor electronic expansion valve based on the operating status level and current operating parameters to adjust the operating capacity of the indoor unit. This allows the operating capacity of the indoor unit to quickly match the room load demand, rapidly meet user needs, and improve the user experience.

[0017] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the refrigerant circulation in a multi-split air conditioning system according to an embodiment; Figure 2-5 A chart showing the operational status levels of indoor units in cooling mode of a multi-split air conditioning system according to an embodiment; Figure 6-9 A chart showing the classification of the operating status levels of the indoor unit in the heating mode of a multi-split air conditioning system according to an embodiment; Figure 10 A diagram showing the electronic expansion valve control of the indoor unit in cooling mode of a multi-split system according to an embodiment; Figure 11 This is a diagram showing the control of the electronic expansion valve of the indoor unit in heating mode of a multi-split air conditioning system according to an embodiment.

[0020] In the picture, 1. Compressor; 2. Outdoor ambient temperature detection module; 3. First indoor electronic expansion valve; 4. Second indoor electronic expansion valve. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0027] The multi-split air conditioning system disclosed in this application executes the refrigeration cycle of an air conditioner by using a compressor, condenser, throttling device, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0028] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0029] The throttling device expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the throttling device, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0030] The outdoor unit of a multi-split system refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of a multi-split system includes an indoor heat exchanger. A multi-split system includes at least two indoor units, and each indoor unit is equipped with an indoor electronic expansion valve. The capacity of the indoor unit is adjusted by regulating the opening of the indoor electronic expansion valve.

[0031] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0032] A multi-split air conditioning system includes an outdoor unit and at least two indoor units. The outdoor unit includes a compressor, an outdoor heat exchanger, and an outdoor ambient temperature detection module. Each indoor unit includes an indoor heat exchanger and an indoor electronic expansion valve.

[0033] exist Figure 1 In the example, the multi-split system includes an outdoor unit and a first indoor unit located in room one and a second indoor unit located in room two.

[0034] The outdoor unit is equipped with a compressor 1, an outdoor heat exchanger, and an outdoor ambient temperature detection module 2 for detecting the outdoor ambient temperature.

[0035] The first indoor unit is equipped with a first indoor heat exchanger and a first indoor electronic expansion valve 3. The capacity of the first indoor unit can be adjusted by adjusting the opening degree of the first indoor electronic expansion valve 3.

[0036] The second indoor unit is equipped with a second indoor heat exchanger and a second indoor electronic expansion valve 4. The capacity of the second indoor unit can be adjusted by adjusting the opening degree of the second indoor electronic expansion valve 4.

[0037] Both the first and second indoor units include an indoor ambient temperature detection module and an outlet air temperature detection module.

[0038] The indoor ambient temperature detection module is used to detect the indoor ambient temperature Ti.

[0039] The outlet air temperature detection module is used to detect the outlet air temperature To of the indoor unit.

[0040] Because room one and room two may have different indoor load demands due to factors such as different insulation effects, whether windows are open, whether they face the sun, different elevation differences, and different pipe lengths, the indoor units installed may be less than or equal to the room load demand, and the two units may perform differently, which may lead to different or even poor performance during the start-up phase.

[0041] Therefore, a multi-unit system based on big data active identification and control for fast and adaptable start-up is proposed.

[0042] After the outdoor unit is turned on and enters the normal control phase, or after the indoor unit is turned on, the indoor ambient temperature Ti and the outlet air temperature To are acquired. The operating status level of the indoor unit is determined based on the time it takes for |Indoor Ambient Temperature Ti - Outlet Air Temperature To| to meet the set conditions. The opening of the indoor electronic expansion valve is adjusted according to the operating status level of the indoor unit and |Indoor Ambient Temperature Ti - Outlet Air Temperature To|. The standard for the operating status level of the indoor unit is determined in advance through big data.

[0043] During the start-up phase of the indoor unit, the operating status level of the indoor unit is judged. Based on the judgment result and the system operating parameters, an optimized control strategy is given, so that the air conditioning system can meet the room load demand as soon as possible during the start-up phase, quickly meet user needs, and improve user experience.

[0044] In some embodiments, the outdoor unit includes an outdoor ambient temperature detection module, which acquires the outdoor ambient temperature Ta after the outdoor unit is turned on and enters the normal control phase or after the indoor unit is turned on and a set time is set, and determines the setting conditions based on the outdoor ambient temperature Ta.

[0045] The cooling process includes high-temperature cooling and conventional cooling. The difference in the air conditioner's operating status to meet the room load requirements is significant during high-temperature cooling and conventional cooling. Therefore, it is more reasonable to set different conditions for high-temperature cooling and conventional cooling.

[0046] The heating process also includes low-temperature heating and conventional heating. During low-temperature heating and conventional heating, the difference in the air conditioner's operating status in meeting the room's load requirements is significant. Therefore, it is more reasonable to set different conditions for low-temperature heating and conventional heating.

[0047] The specific method for determining the operating status level of the indoor unit based on the time when |Indoor ambient temperature Ti - Outlet air temperature To| meets the set condition is as follows: the time when |Indoor ambient temperature Ti - Outlet air temperature To| ≥ the set value.

[0048] Among them, the operating status level standard of the indoor unit is determined based on big data.

[0049] By reading the operating data of multi-split air conditioners for cooling and heating in different seasons over a period of time using big data, and combining this with the requirements for fast and comfortable cooling and heating, the operating status levels of the indoor units are classified.

[0050] exist Figure 2-9 The example categorizes the operating status of the indoor unit into three levels: Excellent, Good, and Poor. Excellent indicates that the indoor unit's operation meets the user's needs, Good indicates that the indoor unit's operation is close to the user's needs, and Poor indicates that the indoor unit's operation does not meet the user's needs.

[0051] When the indoor unit is in cooling mode, if the outdoor ambient temperature Ta exceeds the set outdoor ambient temperature for cooling, the setting conditions include a first set value. The operating status level of the indoor unit is determined based on the time when |indoor ambient temperature Ti - air outlet temperature To| ≥ the first set value. When the outdoor ambient temperature Ta does not exceed the cooling set outdoor ambient temperature, the setting conditions include a second setting value. The operating status level of the indoor unit is determined based on the time when |indoor ambient temperature Ti - air outlet temperature To| ≥ the second setting value, wherein the first setting value is less than the second setting value.

[0052] When the indoor unit is in heating mode, if the outdoor ambient temperature Ta exceeds the set outdoor ambient temperature for heating, the setting conditions include a third setting value. The operating status level of the indoor unit is determined based on the time when |indoor ambient temperature Ti - air outlet temperature To| ≥ the third setting value. When the outdoor ambient temperature Ta does not exceed the heating set outdoor ambient temperature, the setting conditions include the fourth setting value. The operating status level of the indoor unit is determined based on the time when |indoor ambient temperature Ti - air outlet temperature To| ≥ the fourth setting value, wherein the third setting value is greater than the fourth setting value.

[0053] exist Figure 2 The example shows the classification of the operating status levels of the indoor unit under high-temperature cooling conditions: When the indoor unit is turned on and the operating mode is cooling mode; when the outdoor unit is turned on and the first time of timing after entering the normal control stage, the outdoor ambient temperature Ta exceeds the set cooling outdoor ambient temperature; when the outdoor unit is turned on and the first time of timing after entering the normal control stage, Ti-To ≥ the first set value; the operating status level of the indoor unit is judged to be excellent.

[0054] When the indoor unit is turned on and the operating mode is cooling mode; when the outdoor unit is turned on and the second time is counted after entering the normal control stage, the outdoor ambient temperature Ta exceeds the set cooling outdoor ambient temperature; when the outdoor unit is turned on and the second time is counted after entering the normal control stage, Ti-To ≥ the first set value; the operating status level of the indoor unit is determined to be good.

[0055] When the indoor unit is turned on and the operating mode is cooling mode; when the outdoor unit is turned on and the third time is counted after entering the normal control stage, the outdoor ambient temperature Ta exceeds the set cooling outdoor ambient temperature; when the outdoor unit is turned on and the third time is counted after entering the normal control stage, Ti-To ≥ the first set value or Ti-To < the first set value; the operating mode of the indoor unit is determined to be poor.

[0056] Among them, the first time < the second time < the third time.

[0057] The outdoor ambient temperature for cooling is generally set at the boundary between high-temperature cooling and conventional cooling temperatures.

[0058] The outdoor unit operates in two phases: the start-up phase and the normal control phase. During the start-up phase, the compressor frequency is continuously adjusted. Once the compressor frequency stabilizes, the unit enters the normal control phase, where the compressor frequency remains essentially constant.

[0059] exist Figure 3 The example shows the classification of the operating status levels of the indoor unit under normal cooling conditions: When the indoor unit is turned on and the operating mode is cooling mode; when the outdoor unit is turned on and enters the normal control stage, the outdoor ambient temperature Ta does not exceed the set cooling outdoor ambient temperature; when the outdoor unit is turned on and enters the normal control stage, Ti-To ≥ the second set value; the operating mode of the indoor unit is determined to be excellent.

[0060] When the indoor unit is turned on and the operating mode is cooling mode; when the outdoor unit is turned on and the second time is counted after entering the normal control stage, the outdoor ambient temperature Ta does not exceed the set cooling outdoor ambient temperature; when the outdoor unit is turned on and the second time is counted after entering the normal control stage, Ti-To ≥ the second set value; the operating mode of the indoor unit is determined to be good.

[0061] When the indoor unit is turned on and the operating mode is cooling mode; when the outdoor unit is turned on and the third time is counted after entering the normal control stage, the outdoor ambient temperature Ta does not exceed the set cooling outdoor ambient temperature; when the outdoor unit is turned on and the third time is counted after entering the normal control stage, Ti-To ≥ the second set value or Ti-To < the second set value; the operating mode of the indoor unit is determined to be poor.

[0062] Among them, the first time < the second time < the third time.

[0063] The outdoor ambient temperature for cooling is generally set at the boundary between high-temperature cooling and conventional cooling temperatures.

[0064] The outdoor unit operates in two phases: the start-up phase and the normal control phase. During the start-up phase, the compressor frequency is continuously adjusted. Once the compressor frequency stabilizes, the unit enters the normal control phase, where the compressor frequency remains essentially constant.

[0065] exist Figure 4 The example illustrates another scenario for classifying the operating status levels of the indoor unit under high-temperature cooling conditions: When the indoor unit is turned on and the operating mode is cooling mode; when the outdoor ambient temperature Ta exceeds the set cooling outdoor ambient temperature at the first time after the indoor unit is turned on; when the indoor unit is turned on and the first time is timed, Ti-To ≥ the first set value; the operating status of the indoor unit is determined to be excellent.

[0066] When the indoor unit is turned on and the operating mode is cooling mode; when the outdoor ambient temperature Ta exceeds the set cooling outdoor ambient temperature at the second time after the indoor unit is turned on; when the indoor unit is turned on and the second time is counted, Ti-To ≥ the first set value; the operating status of the indoor unit is determined to be good.

[0067] When the indoor unit is turned on and the operating mode is cooling mode; when the outdoor ambient temperature Ta exceeds the set cooling outdoor ambient temperature after the third time interval after the indoor unit is turned on; when the third time interval after the indoor unit is turned on, Ti-To ≥ the first set value or Ti-To < the first set value; the operating status of the indoor unit is determined to be poor.

[0068] Among them, the first time < the second time < the third time.

[0069] The outdoor ambient temperature for cooling is generally set at the boundary between high-temperature cooling and conventional cooling temperatures.

[0070] Indoor unit startup includes initial startup and startup after standby.

[0071] exist Figure 5 The example shows another scenario for classifying the operating status levels of the indoor unit under normal cooling conditions: When the indoor unit is turned on and the operating mode is cooling mode; when the timer is started up for the first time after the indoor unit is turned on, the outdoor ambient temperature Ta does not exceed the set outdoor ambient temperature for cooling; when the timer is started up for the first time after the indoor unit is turned on, Ti-To ≥ the second set value; the operating status of the indoor unit is judged to be excellent.

[0072] When the indoor unit is turned on and the operating mode is cooling mode; when the timer is running for the second time after the indoor unit is turned on, the outdoor ambient temperature Ta does not exceed the set outdoor ambient temperature for cooling; when the timer is running for the second time after the indoor unit is turned on, Ti-To ≥ the second set value; the operating status of the indoor unit is determined to be good.

[0073] When the indoor unit is turned on and the operating mode is cooling mode; when the outdoor ambient temperature Ta does not exceed the set cooling outdoor ambient temperature after the third time of time following the start of the indoor unit; when the third time of time following the start of the indoor unit, Ti-To ≥ the second set value or Ti-To < the second set value; the operating status of the indoor unit is determined to be poor.

[0074] Among them, the first time < the second time < the third time.

[0075] The outdoor ambient temperature for cooling is generally set at the boundary between high-temperature cooling and conventional cooling temperatures.

[0076] Indoor unit startup includes initial startup and startup after standby.

[0077] exist Figure 6 The example shows the classification of indoor unit operating status levels under normal heating conditions: When the indoor unit is turned on and the operating mode is heating mode; when the outdoor unit is turned on and the first time is recorded after entering the normal control stage, the outdoor ambient temperature Ta exceeds the set heating outdoor ambient temperature; when the outdoor unit is turned on and the first time is recorded after entering the normal control stage, To-Ti ≥ the third set value; the operating status of the indoor unit is determined to be excellent.

[0078] When the indoor unit is turned on and the operating mode is heating mode; when the outdoor unit is turned on and the second time is counted after entering the normal control stage, the outdoor ambient temperature Ta exceeds the set outdoor ambient temperature for heating; when the outdoor unit is turned on and the second time is counted after entering the normal control stage, To-Ti ≥ the third set value; the operating status of the indoor unit is determined to be good.

[0079] When the indoor unit is turned on and the operating mode is heating mode; when the outdoor unit is turned on and the third time is counted after entering the normal control stage, the outdoor ambient temperature Ta exceeds the set heating outdoor ambient temperature; when the outdoor unit is turned on and the third time is counted after entering the normal control stage, To-Ti ≥ the third set value or To-Ti < the third set value; the operating status of the indoor unit is determined to be poor.

[0080] Among them, the first time < the second time < the third time.

[0081] The outdoor ambient temperature for heating is generally set at the boundary between low-temperature heating and conventional heating temperatures.

[0082] The outdoor unit operates in two phases: the start-up phase and the normal control phase. During the start-up phase, the compressor frequency is continuously adjusted. Once the compressor frequency stabilizes, the unit enters the normal control phase, where the compressor frequency remains essentially constant.

[0083] exist Figure 7 In the example, the indoor unit's operating status is classified under low-temperature heating conditions: When the indoor unit is turned on and the operating mode is heating mode; when the outdoor unit is turned on and the first time is recorded after entering the normal control stage, the outdoor ambient temperature Ta does not exceed the set heating outdoor ambient temperature; when the outdoor unit is turned on and the first time is recorded after entering the normal control stage, To-Ti ≥ the fourth set value; the operating status of the indoor unit is judged to be excellent.

[0084] When the indoor unit is turned on and the operating mode is heating mode; when the outdoor unit is turned on and the second time is counted after entering the normal control stage, the outdoor ambient temperature Ta does not exceed the set heating outdoor ambient temperature; when the outdoor unit is turned on and the second time is counted after entering the normal control stage, To-Ti ≥ the fourth set value; the operating status of the indoor unit is determined to be good.

[0085] When the indoor unit is turned on and the operating mode is heating mode; when the outdoor unit is turned on and the third time is counted after entering the normal control stage, the outdoor ambient temperature Ta does not exceed the set heating outdoor ambient temperature; when the outdoor unit is turned on and the third time is counted after entering the normal control stage, To-Ti ≥ the fourth set value or To-Ti < the fourth set value; the operating status of the indoor unit is judged as poor.

[0086] Among them, the first time < the second time < the third time.

[0087] The outdoor ambient temperature for heating is generally set at the boundary between low-temperature heating and conventional heating temperatures.

[0088] The outdoor unit operates in two phases: the start-up phase and the normal control phase. During the start-up phase, the compressor frequency is continuously adjusted. Once the compressor frequency stabilizes, the unit enters the normal control phase, where the compressor frequency remains essentially constant.

[0089] exist Figure 8 The example shows another scenario for classifying the operating status level of the indoor unit under normal heating conditions: When the indoor unit is turned on and the operating mode is heating mode; when the outdoor ambient temperature Ta exceeds the set outdoor ambient temperature for heating at the first time after the indoor unit is turned on; when the To-Ti is greater than or equal to the third set value at the first time after the indoor unit is turned on; the operating status of the indoor unit is determined to be excellent.

[0090] When the indoor unit is turned on and the operating mode is heating mode; when the outdoor ambient temperature Ta exceeds the set outdoor ambient temperature for heating after the second time of time after the indoor unit is turned on; when the To-Ti is greater than or equal to the third set value after the second time of time after the indoor unit is turned on; the operating status of the indoor unit is determined to be good.

[0091] When the indoor unit is turned on and the operating mode is heating mode; when the timer is running for the third time after the indoor unit is turned on, the outdoor ambient temperature Ta exceeds the set outdoor ambient temperature for heating; when the timer is running for the third time after the indoor unit is turned on, To-Ti ≥ the third set value or To-Ti < the third set value.

[0092] Among them, the first time < the second time < the third time.

[0093] The outdoor ambient temperature for heating is generally set at the boundary between low-temperature heating and conventional heating temperatures.

[0094] Indoor unit startup includes initial startup and startup after standby.

[0095] exist Figure 9 The example shows another scenario for classifying the operating status of the indoor unit under low-temperature heating conditions: When the indoor unit is turned on and the operating mode is heating mode; when the timer is started up for the first time after the indoor unit is turned on, the outdoor ambient temperature Ta does not exceed the set outdoor ambient temperature for heating; when the timer is started up for the first time after the indoor unit is turned on, To-Ti ≥ the fourth set value; the operating status of the indoor unit is judged to be excellent.

[0096] When the indoor unit is turned on and the operating mode is heating mode; when the timer is running for the second time after the indoor unit is turned on, the outdoor ambient temperature Ta does not exceed the set outdoor ambient temperature for heating; when the timer is running for the second time after the indoor unit is turned on, To-Ti ≥ the fourth set value; the operating status of the indoor unit is determined to be good.

[0097] When the indoor unit is turned on and the operating mode is heating mode; when the timer is on for the third time after the indoor unit is turned on, the outdoor ambient temperature Ta does not exceed the set outdoor ambient temperature for heating; when the timer is on for the third time after the indoor unit is turned on, To-Ti ≥ the fourth set value or To-Ti < the fourth set value.

[0098] Among them, the first time < the second time < the third time.

[0099] The outdoor ambient temperature for heating is generally set at the boundary between low-temperature heating and conventional heating temperatures.

[0100] Indoor unit startup includes initial startup and startup after standby.

[0101] In some other embodiments, the operating status of the indoor unit can be divided into two or four or more levels. The more levels there are, the more precise the adjustment and control of the indoor unit.

[0102] After the multi-split system is started, the air conditioning start-up stage of the indoor units is judged according to the above-mentioned indoor unit operation status classification standard. At the same time, based on the judgment results and system operation parameters, a control strategy is given to improve from good to excellent and from poor to excellent. Ultimately, the air conditioning system can meet the room load demand in the start-up stage, thus improving the user experience.

[0103] The multi-split air conditioning system includes a set temperature acquisition module, which is used to acquire the set temperature Ts. When |set temperature Ts - indoor ambient temperature Ti| exceeds the set temperature threshold, the opening of the indoor electronic expansion valve is adjusted according to the operating status level of the indoor unit and |indoor ambient temperature Ti - outlet air temperature To|.

[0104] Adjust the opening of the indoor electronic expansion valve according to the indoor unit's operating status level and |indoor ambient temperature Ti - outlet air temperature To|.

[0105] The opening degree of the indoor electronic expansion valve is negatively correlated with |indoor ambient temperature Ti - outlet air temperature To|.

[0106] The opening degree of the indoor electronic expansion valve is related to the outdoor ambient temperature Ta and |indoor ambient temperature Ti - outlet air temperature To|.

[0107] As the operating status of the indoor unit deteriorates, the opening degree of the indoor electronic expansion valve increases at least within the same outdoor ambient temperature range and the range of |indoor ambient temperature Ti - outlet air temperature To|.

[0108] When the indoor unit is in cooling mode, the conditions for adjusting the opening of the indoor electronic expansion valve according to the operating status level of the indoor unit also include the following: the difference between the compressor discharge temperature and the system pressure saturation temperature, Tdsh, exceeds the set difference, and the indoor unit coil temperature test value, Tc, exceeds the set test value.

[0109] When the indoor unit is in cooling mode, the target value SH correction value of the temperature difference between the gas pipe and liquid pipe of the indoor unit is determined based on the indoor unit's operating status level, outdoor ambient temperature, and |indoor ambient temperature Ti - outlet air temperature To|. The opening of the indoor electronic expansion valve is then adjusted according to the SH correction value.

[0110] Based on the indoor unit's operating status level, once the system understands the excellent or poor operating condition of each indoor unit, it provides the following optimizations for start-up quick and comfortable control for the excellent and poor indoor units, so that each indoor unit can meet the user's usage needs.

[0111] The priority order for adjusting the indoor unit's operating status is: Poor > Good.

[0112] exist Figure 10 In the example, when the indoor unit is operating in cooling mode, Tdsh ≥ set difference, Tc > set test value, Ti-Ts ≥ set temperature threshold, and the indoor unit's operating status level is poor: When Ta > the set outdoor ambient temperature for cooling, if Ti-To ≤ the first cooling temperature difference, the SH correction value = the first SH correction value; if Ti-To ≤ the second cooling temperature difference, the SH correction value = the second SH correction value; if Ti-To ≤ the third cooling temperature difference, the SH correction value = the third SH correction value.

[0113] When Ta ≤ the set outdoor ambient temperature for cooling, if Ti-To ≤ the fourth cooling temperature difference, the SH correction value = the first SH correction value; if Ti-To ≤ the fifth cooling temperature difference, the SH correction value = the second SH correction value; if Ti-To ≤ the sixth cooling temperature difference, the SH correction value = the third SH correction value.

[0114] Among them, the first refrigeration temperature difference < the second refrigeration temperature difference < the third refrigeration temperature difference < the fourth refrigeration temperature difference < the fifth refrigeration temperature difference < the sixth refrigeration temperature difference, and the first SH correction value > the second SH correction value > the third SH correction value.

[0115] When the indoor unit is operating in cooling mode, Tdsh ≥ set difference, Tc > set test value, Ti - Ts ≥ set temperature threshold, and the indoor unit's operating status is rated as good: When Ta > the set outdoor ambient temperature for cooling, if Ti-To ≤ the first cooling temperature difference, the SH correction value = the second SH correction value; if Ti-To ≤ the second cooling temperature difference, the SH correction value = the second SH correction value; if Ti-To ≤ the third cooling temperature difference, the SH correction value = the third SH correction value.

[0116] When Ta ≤ the set outdoor ambient temperature for cooling, if Ti-To ≤ the fourth cooling temperature difference, the SH correction value = the second SH correction value; if Ti-To ≤ the fifth cooling temperature difference, the SH correction value = the second SH correction value; if Ti-To ≤ the sixth cooling temperature difference, the SH correction value = the third SH correction value.

[0117] Among them, the first refrigeration temperature difference < the second refrigeration temperature difference < the third refrigeration temperature difference < the fourth refrigeration temperature difference < the fifth refrigeration temperature difference < the sixth refrigeration temperature difference, and the first SH correction value > the second SH correction value > the third SH correction value.

[0118] When the indoor unit is in heating mode, the target value SC correction value of the difference between the system pressure saturation temperature and the indoor unit liquid pipe coil temperature is determined based on the indoor unit's operating status level, outdoor ambient temperature, and |indoor ambient temperature Ti - outlet air temperature To|. The opening of the indoor electronic expansion valve is then adjusted according to the SC correction value.

[0119] The priority order for adjusting the indoor unit's operating status is: Poor > Good.

[0120] exist Figure 11 In the example, when the indoor unit is operating in heating mode, Ts-Ti ≥ the set temperature threshold, and the indoor unit's operating status level is poor: When Ta < the set outdoor ambient temperature for heating, if To-Ti ≤ the first heating temperature difference, the SC correction value = the first SC correction value; if To-Ti ≤ the second heating temperature difference, the SC correction value = the second SC correction value; if To-Ti ≤ the third heating temperature difference, the SC correction value = the third SC correction value; if To-Ti ≤ the fourth heating temperature difference, the SC correction value = the fourth SC correction value.

[0121] When Ta ≥ the set outdoor ambient temperature for heating, if To-Ti ≤ the fifth heating temperature difference, the SC correction value = the first SC correction value; if To-Ti ≤ the sixth heating temperature difference, the SC correction value = the second SC correction value; if To-Ti ≤ the seventh heating temperature difference, the SC correction value = the third SC correction value; if To-Ti ≤ the eighth heating temperature difference, the SC correction value = the fourth SC correction value.

[0122] When the indoor unit is operating in heating mode, Ts-Ti is greater than or equal to the set temperature threshold, and the indoor unit's operating status is rated as good: When Ta < the set outdoor ambient temperature for cooling, if To-Ti ≤ the first heating temperature difference, the SC correction value = the second SC correction value; if To-Ti ≤ the second heating temperature difference, the SC correction value = the third SC correction value; if To-Ti ≤ the third heating temperature difference, the SC correction value = the fourth SC correction value; if To-Ti ≤ the fourth heating temperature difference, the SC correction value = the fifth SC correction value.

[0123] Among them, the first heating temperature difference < the second heating temperature difference < the third heating temperature difference < the fourth heating temperature difference < the fifth heating temperature difference < the sixth heating temperature difference < the seventh heating temperature difference < the eighth heating temperature difference, and the first SC correction value > the second SC correction value > the third SC correction value > the fourth SC correction value.

[0124] When Ta ≥ the set outdoor ambient temperature for cooling, if To-Ti ≤ the fifth heating temperature difference, the SC correction value = the second SC correction value; if To-Ti ≤ the sixth heating temperature difference, the SC correction value = the third SC correction value; if To-Ti ≤ the seventh heating temperature difference, the SC correction value = the fourth SC correction value; if To-Ti ≤ the eighth heating temperature difference, the SC correction value = the fifth SC correction value.

[0125] Among them, the first heating temperature difference < the second heating temperature difference < the third heating temperature difference < the fourth heating temperature difference < the fifth heating temperature difference < the sixth heating temperature difference < the seventh heating temperature difference < the eighth heating temperature difference, and the second SC correction value > the third SC correction value > the fourth SC correction value > the fifth SC correction value.

[0126] Among them, the change in opening of the indoor electronic expansion valve = correction value * correction coefficient.

[0127] The correction factor is a predetermined value.

[0128] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0129] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-split air conditioning system, comprising an outdoor unit and at least two indoor units, wherein each indoor unit includes an indoor ambient temperature detection module and an outlet air temperature detection module, characterized in that, After the outdoor unit is turned on and enters the normal control phase, or after the indoor unit is turned on, the indoor ambient temperature Ti and the outlet air temperature To are acquired. The operating status level of the indoor unit is determined based on the time it takes for |indoor ambient temperature Ti - outlet air temperature To| to meet the set conditions. The opening of the indoor electronic expansion valve is adjusted according to the operating status level of the indoor unit and |indoor ambient temperature Ti - outlet air temperature To| to optimize the process and meet the room load demand as quickly as possible.

2. The multi-unit air conditioning system according to claim 1, characterized in that, The multi-split air conditioning system includes a set temperature acquisition module for acquiring a set temperature Ts. When |set temperature Ts - indoor ambient temperature Ti| exceeds a set temperature threshold, the opening of the indoor electronic expansion valve is adjusted according to the operating status level of the indoor unit and |indoor ambient temperature Ti - outlet air temperature To|.

3. The multi-unit air conditioning system according to claim 2, characterized in that, When the indoor unit is in cooling mode, the conditions for adjusting the opening of the indoor electronic expansion valve according to the operating status level of the indoor unit also include the following: the difference between the compressor discharge temperature and the system pressure saturation temperature, Tdsh, exceeds the set difference value; and the indoor unit coil temperature test value, Tc, exceeds the set test value.

4. The multi-unit air conditioning system according to claim 3, characterized in that, The opening degree of the indoor electronic expansion valve is negatively correlated with |indoor ambient temperature Ti - outlet air temperature To|.

5. The multi-unit air conditioning system according to any one of claims 1-4, characterized in that, The outdoor unit includes an outdoor ambient temperature detection module, which acquires the outdoor ambient temperature Ta after the outdoor unit is turned on and enters the normal control phase or after the indoor unit is turned on and a set time is set, and determines the set conditions based on the outdoor ambient temperature Ta.

6. The multi-unit air conditioning system according to claim 5, characterized in that, When the indoor unit is in cooling mode, if the outdoor ambient temperature Ta exceeds the set cooling outdoor ambient temperature, the setting condition includes a first setting value; if the outdoor ambient temperature Ta does not exceed the set cooling outdoor ambient temperature, the setting condition includes a second setting value, and the first setting value is less than the second setting value. When the indoor unit is in heating mode, if the outdoor ambient temperature Ta exceeds the set heating outdoor ambient temperature, the setting condition includes a third setting value; if the outdoor ambient temperature Ta does not exceed the set heating outdoor ambient temperature, the setting condition includes a fourth setting value, and the third setting value is greater than the fourth setting value.

7. The multi-unit air conditioning system according to claim 5, characterized in that, The opening degree of the indoor electronic expansion valve is related to the outdoor ambient temperature Ta and |indoor ambient temperature Ti - outlet air temperature To|.

8. The multi-unit air conditioning system according to claim 7, characterized in that, As the operating status of the indoor unit deteriorates, the opening degree of the indoor electronic expansion valve increases at least within the same outdoor ambient temperature range and the range of |indoor ambient temperature Ti - outlet air temperature To|.

9. The multi-unit air conditioning system according to claim 7, characterized in that, When the indoor unit is in cooling mode, a target value SH correction value for the temperature difference between the gas pipe and liquid pipe of the indoor unit is determined based on the operating status level of the indoor unit, the outdoor ambient temperature, and |indoor ambient temperature Ti - outlet air temperature To|. The opening of the indoor electronic expansion valve is adjusted according to the SH correction value. When the indoor unit is in heating mode, a target value SC correction value is determined based on the operating status level of the indoor unit, the outdoor ambient temperature, and |indoor ambient temperature Ti - outlet air temperature To|, which is the difference between the system pressure saturation temperature and the indoor unit liquid pipe coil temperature. The opening of the indoor electronic expansion valve is then adjusted according to the SC correction value.

10. The multi-unit air conditioning system according to claim 7, characterized in that, The change in opening of the indoor electronic expansion valve = correction value * correction coefficient.

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