Multi-split system

Abstract

The multi-split system comprises an outdoor unit and at least two indoor units, each indoor unit comprises an indoor environment temperature detection module and an air outlet temperature detection module, and after the outdoor units are started to enter a normal control stage or the indoor units are started, the indoor environment temperature Ti and the air outlet temperature To are obtained; and the operating state grade of the indoor unit is determined according to the time when the indoor environment temperature Ti and the air outlet temperature To meet the set condition, and the opening degree of an indoor electronic expansion valve is adjusted according to the operating state grade state of the indoor unit and the indoor environment temperature Ti and the air outlet temperature To. Therefore, the multi-split system can quickly adjust the operation capacity of the indoor unit according to the operation state grade and the current operation parameter of the indoor unit, so that the operation capacity of the indoor unit is quickly matched with the room load requirement, the user requirement is quickly met, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and particularly to a multi-connected system. BACKGROUND

[0002] The current domestic building insulation effect is not the same, and the installation environment of the multi-connected system is not the same. In the multi-connected system, due to the complex installation environment outside the field, even if all indoor units are in one system, due to the difference between the indoor units, the length of the pipe is not the same, and other reasons, when starting, different rooms will also appear that the capacity of the indoor unit does not match the current room load demand, which brings different experiences to the user, and even causes complaints.

[0003] In addition, there will be special circumstances such as opening windows in the room, which will cause the room that originally matches the load to become an indoor unit with a capacity less than the room demand, and the indoor unit reacts slowly, thereby causing the indoor side to be insufficient in the starting stage, and unable to quickly meet the user's demand, affecting the user experience.

[0004] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it can include prior art known by those skilled in the art. SUMMARY

[0005] The present application provides a multi-connected system, which solves the technical problem that the capacity of the indoor unit of the existing multi-connected system is affected by the current room load, and cannot quickly meet the user's demand, affecting the user experience.

[0006] To achieve the above application purpose, the present application adopts the following technical scheme: A multi-connected system includes an outdoor unit and at least two indoor units, the indoor unit includes an indoor environment temperature detection module and an air outlet temperature detection module, after the outdoor unit starts to enter the normal control stage or the indoor unit starts, 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 the set condition, and the opening degree of the indoor electronic expansion valve is adjusted according to the running level state of the indoor unit and | indoor environment temperature Ti-air outlet temperature To |.

[0007] In some embodiments of the present application, the multi-connected system includes a set temperature acquisition module for obtaining a set temperature Ts, when | set temperature Ts-indoor environment temperature Ti | exceeds the set temperature threshold, the opening degree of the indoor electronic expansion valve is adjusted according to the running level state of the indoor unit and | indoor environment temperature Ti-air outlet temperature To |.

[0008] In some embodiments of the present application, the condition for adjusting the opening degree of the indoor electronic expansion valve according to the operating level of the indoor unit when the indoor unit is in a cooling state further includes that the difference Tdsh between the discharge temperature of the compressor and the system pressure saturation temperature exceeds a set difference value, and the indoor unit coil temperature test value Tc exceeds a set test value.

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

[0010] In some embodiments of the present application, the outdoor unit includes an outdoor environment temperature detection module, and the outdoor environment temperature Ta is obtained when the outdoor unit is powered on to enter a normal control stage or after the indoor unit is powered on for a set time, and a set condition is determined according to the outdoor environment temperature Ta.

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

[0012] In some embodiments of the present application, the opening degree of the indoor electronic expansion valve is correlated with the outdoor environment temperature Ta and |indoor environment temperature Ti - outlet air temperature To|.

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

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

[0015] In some embodiments of the present application, the opening degree variation of the indoor electronic expansion valve = the correction value * the correction coefficient.

[0016] Compared with the prior art, the advantages and positive effects of the present application are: a multi-split system, comprising an outdoor unit and at least two indoor units, the indoor unit comprising an indoor environment temperature detection module and an outlet air temperature detection module, after the outdoor unit is powered on to enter a normal control stage or after the indoor unit is powered on, the indoor environment temperature Ti and the outlet air temperature To are obtained, the running state level of the indoor unit is determined according to the time when |indoor environment temperature Ti-outlet air temperature To| meets a set condition, and the opening degree of the indoor electronic expansion valve is adjusted according to the running level state of the indoor unit and |indoor environment temperature Ti-outlet air temperature To|. Thus, the multi-split system determines the running state level of the indoor unit according to the time when |indoor environment temperature Ti-outlet air temperature To| meets a set condition, and quickly adjusts the opening degree of the indoor electronic expansion valve according to the running level state of the indoor unit and the current running parameter, so as to adjust the running capacity of the indoor unit, so that the running capacity of the indoor unit can be quickly matched with the room load demand, the user demand is quickly met, and the user experience is improved.

[0017] Other features and advantages of the present application will become more apparent after reading the specific embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0019] Figure 1 A refrigerant circulation schematic diagram of the multi-split system according to the embodiments; Figures 2-5 A running state level division chart of the indoor unit in the cooling mode of the multi-split system according to the embodiments; Figures 6-9 A running state level division chart of the indoor unit in the heating mode of the multi-split system according to the embodiments; Figure 10 A control chart of the electronic expansion valve of the indoor unit in the cooling mode of the multi-split system according to the embodiments; Figure 11 A control chart of the electronic expansion valve of the indoor unit in the heating mode of the multi-split system according to the embodiments.

[0020] In the drawings, 1, compressor; 2. An outdoor ambient temperature detecting module; 3. A first indoor electronic expansion valve; 4. A second indoor electronic expansion valve. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0022] In the description of the present application, it should be understood that the terms “center”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0023] The terms “first” and “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of “a plurality of” is two or more.

[0024] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms “mounting”, “connecting”, “connection” should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0025] In the present invention, unless explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature.

[0026] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present invention. For the purpose of simplification, the components and arrangements of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeatedly refer to numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

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

[0028] The low-temperature and low-pressure refrigerant enters the compressor, which compresses the refrigerant gas into a high-temperature and high-pressure state 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 heat is released to the surrounding environment through the condensation process.

[0029] The throttling device expands the high-temperature and high-pressure liquid-phase refrigerant formed in the condenser into low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the throttling device and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve the refrigeration effect by exchanging heat with the material to be cooled using the latent heat of evaporation of the refrigerant. Throughout the cycle, the air conditioner can adjust the temperature of the indoor space.

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

[0031] The indoor heat exchanger and the outdoor heat exchanger are used as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating state, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling state.

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

[0033] In the example of Figure 1 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 provided 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 provided with a first indoor heat exchanger and a first indoor electronic expansion valve 3, and 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 provided with a second indoor heat exchanger and a second indoor electronic expansion valve 4, and the capacity of the second indoor unit can be adjusted by adjusting the opening degree of the second indoor electronic expansion valve 4.

[0037] The first indoor unit and the second indoor unit each 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 heat preservation effects, whether the windows are open, whether they are sunny, different elevations, different lengths of piping, and other factors, the indoor load demand may be different, at this time, the indoor unit may be less than or equal to the room load demand, and the performance of the two is different, which may cause the starting stage to have different effects or even poor effects.

[0041] Therefore, a multi-split system based on big data active identification and control is proposed.

[0042] After the outdoor unit enters the normal control stage or the indoor unit is started, the indoor environment temperature Ti and the outlet air temperature To are obtained, the running state level of the indoor unit is determined according to the time when |indoor environment temperature Ti-outlet air temperature To| meets the set condition, the opening of the indoor electronic expansion valve is adjusted according to the running level state of the indoor unit and |indoor environment temperature Ti-outlet air temperature To|, and the running state level standard of the indoor unit is determined by big data in advance.

[0043] In the starting stage of the indoor unit, the running state level of the indoor unit is judged, and a control strategy of turning to optimization is given according to the judgment result combined with system running parameters, so that the air conditioning system can meet the room load demand as soon as possible in the starting stage, the user demand can be quickly met, and the user experience is improved.

[0044] In some embodiments, the outdoor unit comprises an outdoor environment temperature detection module, and the outdoor environment temperature Ta is obtained when the outdoor unit enters the normal control stage or the indoor unit is started for a set time, and the set condition is determined according to the outdoor environment temperature Ta.

[0045] The refrigeration process includes high-temperature refrigeration and conventional refrigeration, and the difference in the running state of the air conditioner to meet the room load demand is obvious in the high-temperature refrigeration and conventional refrigeration process, so it is more reasonable to set different set conditions for the high-temperature refrigeration and conventional refrigeration process.

[0046] The heating process also includes low-temperature heating and conventional heating, and the difference in the running state of the air conditioner to meet the room load demand is obvious in the low-temperature heating and conventional heating process, so it is more reasonable to set different set conditions for the low-temperature heating and conventional heating process.

[0047] The specific method for determining the running state level of the indoor unit according to the time when |indoor environment temperature Ti-outlet air temperature To| meets the set condition is that |indoor environment temperature Ti-outlet air temperature To|≥set value.

[0048] The running state level standard of the indoor unit is determined by big data.

[0049] The running data of the multi-split unit in different seasons for a period of time is read by big data, and the running state level of the indoor unit is divided in combination with the requirements of quick refrigeration and heating.

[0050] In the example of Figures 2-9 The running state level of the indoor unit is divided into three levels of excellent, good and poor. Excellent means that the running of the indoor unit meets the user's use demand, good means that the running of the indoor unit is close to the user's use demand, and poor means that the running of the indoor unit does not meet the user's use demand.

[0051] When the indoor unit is in the cooling state and the outdoor environment temperature Ta exceeds the set cooling outdoor environment temperature, the set condition includes a first set value, and the running state level of the indoor unit is determined according to the time when |indoor environment temperature Ti-outlet air temperature To|≥the first set value. When the outdoor environment temperature Ta does not exceed the set cooling outdoor environment temperature, the set condition includes a second set value, and the running state level of the indoor unit is determined according to the time when |indoor environment temperature Ti-outlet air temperature To|≥the second set value, wherein the first set value is less than the second set value.

[0052] When the indoor unit is in the heating state and the outdoor environment temperature Ta exceeds the set heating outdoor environment temperature, the set condition includes a third set value, and the running state level of the indoor unit is determined according to the time when |indoor environment temperature Ti-outlet air temperature To|≥the third set value. When the outdoor environment temperature Ta does not exceed the set heating outdoor environment temperature, the set condition includes a fourth set value, and the running state level of the indoor unit is determined according to the time when |indoor environment temperature Ti-outlet air temperature To|≥the fourth set value, wherein the third set value is greater than the fourth set value.

[0053] In the example of the running state level of the indoor unit in the high-temperature cooling condition, Figure 2 The running state level of the indoor unit in the high-temperature cooling condition is divided as follows: When the indoor unit is started and the running mode is the cooling mode, the outdoor environment temperature Ta exceeds the set cooling outdoor environment temperature when the outdoor unit is started and enters the normal control stage for a first time, Ti-To≥the first set value when the outdoor unit is started and enters the normal control stage for the first time, and it is determined that the running state level of the indoor unit is excellent.

[0054] When the indoor unit is started and the running mode is the cooling mode, the outdoor environment temperature Ta exceeds the set cooling outdoor environment temperature when the outdoor unit is started and enters the normal control stage for a second time, Ti-To≥the first set value when the outdoor unit is started and enters the normal control stage for the second time, and it is determined that the running state level of the indoor unit is good.

[0055] When the indoor unit is started and the running mode is the cooling mode, the outdoor environment temperature Ta exceeds the set cooling outdoor environment temperature when the outdoor unit is started and enters the normal control stage for a third time, Ti-To≥the first set value or Ti-To<the first set value when the outdoor unit is started and enters the normal control stage for the third time, and it is determined that the running mode of the indoor unit is poor.

[0056] Wherein, the first time < the second time < the third time.

[0057] The set cooling outdoor environment temperature is generally the high-temperature cooling and normal cooling temperature demarcation point.

[0058] The outdoor unit operating state is divided into a start-up stage and a normal control stage. In the start-up stage, the compressor frequency is constantly adjusted. After the compressor frequency is adjusted to be stable, the normal control stage is reached. In the normal control stage, the compressor frequency is basically unchanged.

[0059] In Figure 3 In an example, the operating state levels of the indoor unit in a normal refrigeration working condition are divided as follows: When the indoor unit is started and the operating mode is a refrigeration mode, and when the outdoor unit is started and enters the normal control stage for a first time, the outdoor environment temperature Ta does not exceed a set refrigeration outdoor environment temperature. When the outdoor unit is started and enters the normal control stage for the first time, Ti-To≥ the second set value. It is determined that the operating mode of the indoor unit is excellent.

[0060] When the indoor unit is started and the operating mode is a refrigeration mode, and when the outdoor unit is started and enters the normal control stage for a second time, the outdoor environment temperature Ta does not exceed the set refrigeration outdoor environment temperature. When the outdoor unit is started and enters the normal control stage for the second time, Ti-To≥ the second set value. It is determined that the operating mode of the indoor unit is good.

[0061] When the indoor unit is started and the operating mode is a refrigeration mode, and when the outdoor unit is started and enters the normal control stage for a third time, the outdoor environment temperature Ta does not exceed the set refrigeration outdoor environment temperature. When the outdoor unit is started and enters the normal control stage for the third time, Ti-To≥ the second set value or Ti-To< the second set value. It is determined that the operating mode of the indoor unit is poor.

[0062] The first time < the second time < the third time.

[0063] The set refrigeration outdoor environment temperature is generally a high-temperature refrigeration and normal refrigeration temperature dividing point.

[0064] The outdoor unit operating state is divided into a start-up stage and a normal control stage. In the start-up stage, the compressor frequency is constantly adjusted. After the compressor frequency is adjusted to be stable, the normal control stage is reached. In the normal control stage, the compressor frequency is basically unchanged.

[0065] In Figure 4 In another example, the operating state levels of the indoor unit in a high-temperature refrigeration working condition are divided as follows: When the indoor unit is started and the operating mode is a refrigeration mode, and when the indoor unit is started and enters the normal control stage for a first time, the outdoor environment temperature Ta exceeds the set refrigeration outdoor environment temperature. When the indoor unit is started and enters the normal control stage for the first time, Ti-To≥ the first set value. It is determined that the operating state of the indoor unit is excellent.

[0066] When the indoor unit is started and the operation mode is the cooling mode; when the outdoor environment temperature Ta exceeds the set cooling outdoor environment temperature after the indoor unit is started for the second time; when Ti-To≥ the first set value after the indoor unit is started for the second time; and when the operation state of the indoor unit is determined to be good.

[0067] When the indoor unit is started and the operation mode is the cooling mode; when the outdoor environment temperature Ta exceeds the set cooling outdoor environment temperature after the indoor unit is started for the third time; when Ti-To≥ the first set value or Ti-To< the first set value after the indoor unit is started for the third time; and when the operation state of the indoor unit is determined to be poor.

[0068] The first time < the second time < the third time.

[0069] The set cooling outdoor environment temperature is generally a temperature demarcation point between high-temperature cooling and normal cooling.

[0070] The starting of the indoor unit includes the first starting and the starting after standby.

[0071] In the example of Figure 5 Another case of classification of the operation state level of the indoor unit in the normal cooling condition is as follows: When the indoor unit is started and the operation mode is the cooling mode; when the outdoor environment temperature Ta does not exceed the set cooling outdoor environment temperature after the indoor unit is started for the first time; when Ti-To≥ the second set value after the indoor unit is started for the first time; and when the operation state of the indoor unit is determined to be excellent.

[0072] When the indoor unit is started and the operation mode is the cooling mode; when the outdoor environment temperature Ta does not exceed the set cooling outdoor environment temperature after the indoor unit is started for the second time; when Ti-To≥ the second set value after the indoor unit is started for the second time; and when the operation state of the indoor unit is determined to be good.

[0073] When the indoor unit is started and the operation mode is the cooling mode; when the outdoor environment temperature Ta does not exceed the set cooling outdoor environment temperature after the indoor unit is started for the third time; when Ti-To≥ the second set value or Ti-To< the second set value after the indoor unit is started for the third time; and when the operation state of the indoor unit is determined to be poor.

[0074] The first time < the second time < the third time.

[0075] The set cooling outdoor environment temperature is generally a temperature demarcation point between high-temperature cooling and normal cooling.

[0076] The starting of the indoor unit includes the first starting and the starting after standby.

[0077] In the example of Figure 6 Classification of the operation state level of the indoor unit in the normal heating condition is as follows: 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 started and the operation mode is the heating mode, the outdoor environment temperature Ta exceeds the set heating outdoor environment temperature when the first time is counted after the indoor unit is started, and To-Ti≥ the third set value when the first time is counted after the indoor unit is started.

[0086] The first time < the second time < the third time.

[0087] The set heating outdoor environment temperature is generally a low-temperature heating and normal heating temperature demarcation point.

[0088] The operation state of the outdoor unit is divided into a starting stage and a normal control stage. In the starting stage, the frequency of the compressor is continuously adjusted. After the frequency of the compressor is adjusted to be stable, the normal control stage is reached. In the normal control stage, the frequency of the compressor is basically unchanged.

[0089] In the example of Figure 8 Another situation for classifying the operation state level of the indoor unit in the low-temperature heating condition is as follows: When the indoor unit is started and the operation mode is the heating mode, the outdoor environment temperature Ta exceeds the set heating outdoor environment temperature when the first time is counted after the indoor unit is started, and To-Ti≥ the third set value when the first time is counted after the indoor unit is started.

[0090] When the indoor unit is started and the operation mode is the heating mode, the outdoor environment temperature Ta exceeds the set heating outdoor environment temperature when the second time is counted after the indoor unit is started, and To-Ti≥ the third set value when the second time is counted after the indoor unit is started.

[0091] When the indoor unit is started and the operation mode is the heating mode, the outdoor environment temperature Ta exceeds the set heating outdoor environment temperature when the third time is counted after the indoor unit is started, and To-Ti≥ the third set value or To-Ti< the third set value when the third time is counted after the indoor unit is started.

[0092] The first time < the second time < the third time.

[0093] The set heating outdoor environment temperature is generally a low-temperature heating and normal heating temperature demarcation point.

[0094] The starting of the indoor unit includes the first starting and the starting after standby.

[0095] In the example of Figure 9 Another situation for classifying the operation state level of the indoor unit in the low-temperature heating condition is as follows: When the indoor unit is started and the operation mode is the heating mode; when the indoor unit is started and the first time is counted, the outdoor environment temperature Ta does not exceed the set heating outdoor environment temperature; when the indoor unit is started and the first time is counted, To-Ti≥ the fourth set value; it is determined that the operation state of the indoor unit is excellent.

[0096] When the indoor unit is started and the operation mode is the heating mode; when the indoor unit is started and the second time is counted, the outdoor environment temperature Ta does not exceed the set heating outdoor environment temperature; when the indoor unit is started and the second time is counted, To-Ti≥ the fourth set value; it is determined that the operation state of the indoor unit is good.

[0097] When the indoor unit is started and the operation mode is the heating mode; when the indoor unit is started and the third time is counted, the outdoor environment temperature Ta does not exceed the set heating outdoor environment temperature; when the indoor unit is started and the third time is counted, To-Ti≥ the fourth set value or To-Ti< the fourth set value.

[0098] The first time < the second time < the third time.

[0099] The set heating outdoor environment temperature is generally a low-temperature heating and a conventional heating temperature division point.

[0100] The starting of the indoor unit includes the first starting and the starting after standby.

[0101] In some other embodiments, the operation state level of the indoor unit can also be divided into two or four or more levels, and the more levels are divided, the more precise the adjustment control of the indoor unit is.

[0102] After the multi-split system is started, the fast-adaptive excellent, good and poor judgment of the starting air conditioner of the indoor unit is performed according to the above-mentioned operation level state division standard of the indoor unit, and the control strategy of good to excellent and poor to excellent is further given according to the judgment result combined with the system operation parameters, so that the air conditioning system finally meets the room load demand in the starting stage, and the user experience is improved.

[0103] The multi-split system comprises a set temperature acquisition module, the set temperature acquisition module is used for acquiring a set temperature Ts, and when |the set temperature Ts-the indoor environment temperature Ti| exceeds a set temperature threshold value, the opening degree of the indoor electronic expansion valve is adjusted according to the operation level state of the indoor unit and |the indoor environment temperature Ti-the outlet air temperature To|.

[0104] The opening degree of the indoor electronic expansion valve is adjusted according to the operation level state of the indoor unit and |the indoor environment temperature Ti-the outlet air temperature To|.

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

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

[0107] As the operation state level of the indoor unit deteriorates, the opening degree of the indoor electronic expansion valve increases at least in a same outdoor ambient temperature range and a temperature difference range between the indoor ambient temperature Ti and the outlet air temperature To.

[0108] The condition for adjusting the opening degree of the indoor electronic expansion valve according to the operation level state of the indoor unit when the indoor unit operates in the refrigeration state further includes that a difference Tdsh between the discharge temperature of the compressor and the saturation temperature of the system pressure exceeds a set difference value, and a coil temperature test value Tc of the indoor unit exceeds a set test value.

[0109] When the indoor unit operates in the refrigeration state, a target value SH correction value of the temperature difference between the gas pipe temperature and the liquid pipe temperature of the indoor unit is determined according to the operation level state of the indoor unit, the outdoor ambient temperature and the temperature difference between the indoor ambient temperature Ti and the outlet air temperature To, and the opening degree of the indoor electronic expansion valve is adjusted according to the SH correction value.

[0110] Based on the operation level state of the indoor unit, when the system learns the good and poor operation of each indoor unit, the following optimization of the start-up quick adaptation control is given for the good and poor indoor units, so that each indoor unit can meet the user's use demand.

[0111] The priority order of adjustment according to the operation level state of the indoor unit is: poor > good.

[0112] In the example of Figure 10 , when the operation state of the indoor unit is refrigeration, Tdsh≥ the set difference value, Tc> the set test value, Ti-Ts≥ the set temperature threshold value, and the operation level state of the indoor unit is poor: When Ta> the set refrigeration outdoor ambient temperature, if Ti-To≤ the first refrigeration temperature difference, the SH correction value = the first SH correction value; if Ti-To≤ the second refrigeration temperature difference, the SH correction value = the second SH correction value; if Ti-To≤ the third refrigeration temperature difference, the SH correction value = the third SH correction value.

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

[0115] When the indoor unit is in a cooling operation state, Tdsh ≥ a set difference value, Tc > a set test value, Ti-Ts ≥ a set temperature threshold value, and the operation level state of the indoor unit is good, the following is performed: When Ta > a set cooling outdoor environment temperature, if Ti-To ≤ a first cooling temperature difference, the SH correction value = a second SH correction value; if Ti-To ≤ a second cooling temperature difference, the SH correction value = a second SH correction value; if Ti-To ≤ a third cooling temperature difference, the SH correction value = a third SH correction value.

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

[0117] Wherein, the first cooling temperature difference < the second cooling temperature difference < the third cooling temperature difference < the fourth cooling temperature difference < the fifth cooling temperature difference < the sixth cooling temperature difference, the first SH correction value > the second SH correction value > the third SH correction value.

[0118] When the indoor unit is in a heating operation state, a target value SC correction value of the system pressure saturation temperature and the indoor unit liquid pipe coil temperature difference value is determined according to the operation level state of the indoor unit, the outdoor environment temperature and | indoor environment temperature Ti-outlet temperature To |, and the opening degree of the indoor electronic expansion valve is adjusted according to the SC correction value.

[0119] The priority order of adjustment according to the operation level state of the indoor unit is: bad > good.

[0120] In the example of Figure 11 When the indoor unit is in a heating operation state, Ts-Ti ≥ a set temperature threshold value, and the operation level state of the indoor unit is bad, the following is performed: When Ta < a set heating outdoor environment temperature, if To-Ti ≤ a first heating temperature difference, the SC correction value = a first SC correction value; if To-Ti ≤ a second heating temperature difference, the SC correction value = a second SC correction value; if To-Ti ≤ a third heating temperature difference, the SC correction value = a third SC correction value; if To-Ti ≤ a fourth heating temperature difference, the SC correction value = a fourth SC correction value.

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

[0122] When the operation state of the indoor unit is heating, Ts-Ti≥ the set temperature threshold, and the operation level state of the indoor unit is good: When Ta < the set refrigeration outdoor environment temperature, 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] Wherein, 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, 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 refrigeration outdoor environment temperature, 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] Wherein, 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, the second SC correction value > the third SC correction value > the fourth SC correction value > the fifth SC correction value.

[0126] Wherein, the opening degree change amount of the indoor electronic expansion valve = the correction value * the correction coefficient.

[0127] The correction coefficient is a value determined in advance.

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

[0129] The above merely describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements within the technical range disclosed by the present application can be easily thought of by those skilled in the art, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection 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 air outlet 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 - air outlet temperature To| to meet the set condition. The opening degree of the indoor electronic expansion valve is adjusted according to the operating status of the indoor unit and |indoor ambient temperature Ti - air outlet temperature To|.

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 level status 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 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-split 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, the target value SH correction value of the temperature difference between the gas pipe and liquid pipe of the indoor unit is determined according to the operating 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 is determined based on the operating 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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