Multi-split system

Abstract

The multi-split system comprises an outdoor unit and at least two indoor units, each indoor unit comprises an indoor expansion valve, and the current operation grade of each indoor unit is determined according to the starting / stopping times within specific time after the outdoor unit is started and the indoor units are started for the first time and standby; and the compressor frequency and the indoor expansion valve opening degree when the indoor unit is started are adjusted according to the current operation grade of the indoor unit so that the current operation grade of the indoor unit can be converted into the target operation grade. The multi-split system determines the current operation level of the indoor unit according to the start-stop state of the indoor unit, adjusts the frequency of a compressor and the opening degree of an indoor expansion valve so as to adjust the operation capacity of the indoor unit, so that the operation capacity of the indoor unit can be rapidly matched with the room load requirement, and the current operation level of the indoor unit is converted into the target operation level. And frequent starting and stopping of the indoor unit are avoided, the energy-saving effect is achieved, and the user experience is improved.

Description

TECHNICAL FIELD

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

[0002] The current building insulation effect is different, and the use habits and use scenes of air conditioning users are different, for example, whether to open the window or not, etc., which leads to that in the multi-connected system, the capacities of different indoor units are different from the actual room heat load demand, and even the capacity of the indoor unit is greater than the room load demand, and then the capacity over-output occurs, thereby leading to frequent ON / OFF of the indoor side, not energy-saving, and affecting the user experience.

[0003] The above information disclosed in the background of the application is only used to increase the understanding of the background of the application, and therefore, it can include the prior art known by those skilled in the art. SUMMARY

[0004] 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 greater than the room load demand, leading to frequent start-stop of the indoor side, not energy-saving, and affecting the user experience.

[0005] To achieve the above application purposes, the present application adopts the following technical solutions: A multi-connected system, comprising an outdoor unit and at least two indoor units, wherein the indoor unit comprises an indoor expansion valve, determining the current operation level of the indoor unit according to the number of start / stop within a specific time after the outdoor unit starts and the indoor unit starts for the first time and stands by; adjusting the compressor frequency and the indoor expansion valve opening degree when the indoor unit starts according to the current operation level of the indoor unit to make the current operation level of the indoor unit change to a target operation level.

[0006] In some examples of the present application, the compressor frequency at the previous moment before the indoor unit starts is obtained, the compressor frequency at the current moment when the indoor unit starts is calculated, and the adjustment coefficient is determined through the current operation level of the indoor unit; adjusting the compressor frequency at the current moment and the compressor frequency at the previous moment through the adjustment coefficient to obtain the adjusted compressor frequency when the indoor unit starts.

[0007] In some examples of the present application, the adjusted compressor frequency when the indoor unit starts = adjustment coefficient*(compressor frequency at the current moment when the indoor unit starts-compressor frequency at the previous moment before the indoor unit starts)+compressor frequency at the previous moment before the indoor unit starts; The adjustment coefficient is a number between 0 and 1.

[0008] In some examples of the present application, the adjustment range of the compressor frequency at the start of the indoor unit is between the minimum frequency and the maximum frequency in the normal control stage.

[0009] In some examples of the present application, the indoor expansion valve opening degree at the start of the indoor unit is obtained, the adjustment coefficient is determined according to the current operation level of the indoor unit, and the indoor expansion valve opening degree at the start of the indoor unit is adjusted by the adjustment coefficient to obtain the adjusted indoor expansion valve opening degree at the start of the indoor unit.

[0010] In some examples of the present application, the adjusted indoor expansion valve opening degree at the start of the indoor unit = the adjustment coefficient * the indoor expansion valve opening degree at the start of the indoor unit. The adjustment coefficient is a number between 0 and 1.

[0011] In some examples of the present application, the adjustment range of the indoor expansion valve opening degree is between a * the initial opening degree of the indoor expansion valve and the maximum opening degree, where a is a number between 0 and 1.

[0012] In some examples of the present application, the start frequency of the compressor at the start of the outdoor unit is adjusted according to the current operation level of the indoor unit: the last start frequency of the compressor is obtained, and the adjustment coefficient is determined according to the current operation level of the indoor unit. The start frequency of the compressor at the start of the outdoor unit is obtained by adjusting the last start frequency of the compressor by the adjustment coefficient.

[0013] In some examples of the present application, the start frequency of the compressor at the start of the outdoor unit = the adjustment coefficient * the last start frequency of the compressor. The adjustment coefficient is a number between 0 and 1.

[0014] In some examples of the present application, the adjustment range of the start frequency of the compressor is between the maximum frequency and the minimum frequency in the start stage.

[0015] In some examples of the present application, the indoor expansion valve opening degree at the start of the outdoor unit is adjusted according to the current operation level of the indoor unit: the maximum opening degree of the indoor expansion valve is obtained, and the adjustment coefficient is determined according to the current operation level of the indoor unit. The maximum opening degree of the indoor expansion valve is adjusted by the adjustment coefficient to obtain the indoor expansion valve opening degree at the start of the outdoor unit.

[0016] In some examples of the present application, the indoor expansion valve opening degree at the start of the outdoor unit = the adjustment coefficient * the maximum opening degree of the indoor expansion valve. The adjustment coefficient is a number between 0 and 1.

[0017] In some examples of the present application, the adjustment range of the indoor expansion valve opening degree is between the initial opening degree and the maximum opening degree of the indoor expansion valve, where a is a number between 0 and 1.

[0018] In some examples of the present application, the standby condition of the indoor unit is modified according to the current operation level of the indoor unit: the cooling set temperature at which the indoor unit enters the standby state is lowered or the heating temperature at which the indoor unit enters the standby state is raised.

[0019] In some examples of the present application, the more the number of start / stop of the indoor unit within the specific time, the worse the current operation level of the indoor unit; the less the number of start / stop of the indoor unit within the specific time, the better the current operation level of the indoor unit.

[0020] 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 expansion valve, the current operation level of the indoor unit is determined according to the number of start / stop within a specific time after the outdoor unit starts and the indoor unit starts for the first time and enters standby; the compressor frequency and the indoor expansion valve opening degree when the indoor unit starts are adjusted according to the current operation level of the indoor unit to change the current operation level of the indoor unit to a target operation level. The multi-split system determines the current operation level of the indoor unit according to the start / stop state of the indoor unit, adjusts the compressor frequency and the indoor expansion valve opening degree, to adjust the operation capacity of the indoor unit, so that the operation capacity of the indoor unit can quickly match the room load demand, so that the current operation level of the indoor unit changes to the target operation level, avoids frequent start / stop of the indoor unit, achieves the effect of energy saving, and improves user experience.

[0021] 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

[0022] 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.

[0023] Figure 1 A refrigerant circulation schematic diagram of the multi-split system according to the embodiments; Figure 2 A running state level division chart of the indoor unit in the cooling mode of the multi-split system according to the embodiments; Figure 3 A running state level division chart of the indoor unit in the heating mode of the multi-split system according to the embodiments; Figure 4 A compressor frequency control chart for differential cooling mode optimization in a multi-split system according to an embodiment; Figure 5 A compressor frequency control chart for the cooling mode of a multi-split air conditioning system according to an embodiment, showing the transition from good to excellent. Figure 6 A compressor frequency control chart for differential heating mode optimization of a multi-split system according to an embodiment; Figure 7 A compressor frequency control chart for the heating mode of a multi-split system according to an embodiment, showing the transition from good to excellent. Figure 8 A control diagram of the indoor expansion valve for differential cooling mode optimization in a multi-split system according to an embodiment; Figure 9 A control diagram of the indoor expansion valve for switching from good to good cooling mode in a multi-split system according to an embodiment; Figure 10 A control diagram of the indoor expansion valve for differential heating mode optimization in a multi-split system according to an embodiment; Figure 11 A control diagram of the indoor expansion valve for the heating mode of a multi-split system according to an embodiment, showing the transition from good to excellent. Figure 12 A control chart for differential switching of indoor units in a multi-split air conditioning system according to an embodiment; Figure 13 This is a control chart for improving the indoor unit performance of a multi-split air conditioning system according to an embodiment.

[0024] In the picture, 1. Compressor; 3. First indoor expansion valve; 4. Second indoor expansion valve. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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 expansion valve. The capacity of the indoor unit is adjusted by regulating the opening of the indoor expansion valve.

[0035] 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.

[0036] A multi-split air conditioning system includes an outdoor unit and at least two indoor units. The outdoor unit includes a compressor and an outdoor heat exchanger, and each indoor unit includes an indoor heat exchanger and an indoor expansion valve.

[0037] exist Figure 1 In the example, the multi-split system includes an outdoor unit, a first indoor unit located in room one, and a second indoor unit located in room two. The indoor units are connected to the first and second indoor units via connection pipes to form a multi-split system.

[0038] The outdoor unit is equipped with a compressor 1 and an outdoor heat exchanger. The operating capacity of the indoor unit can be adjusted by regulating the operating frequency of the compressor.

[0039] The first indoor unit is equipped with a first indoor heat exchanger and a first indoor expansion valve 3. The operating capacity of the first indoor unit can be adjusted by adjusting the opening degree of the first indoor expansion valve 3.

[0040] The second indoor unit is equipped with a second indoor heat exchanger and a second indoor expansion valve 4. The operating capacity of the second indoor unit can be adjusted by adjusting the opening of the second indoor expansion valve 4.

[0041] Both the first and second indoor units include an indoor ambient temperature detection module and a temperature acquisition module.

[0042] The indoor ambient temperature detection module is used to detect the indoor ambient temperature Ti.

[0043] The set temperature acquisition module is used to acquire the indoor set temperature Ts.

[0044] 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 unit's operating capacity may exceed the room's load demand. This can lead to the air conditioner over-outputting and frequently switching on and off, resulting in energy waste and affecting the user experience.

[0045] Therefore, a multi-unit air conditioning system based on big data active identification and control is proposed to save energy.

[0046] The current operating level of the indoor unit is determined based on the number of start / stop cycles within a specific time period after the outdoor unit starts and the indoor unit starts for the first time and then goes into standby mode; The compressor frequency and expansion valve opening of the indoor unit are adjusted according to the current operating level of the indoor unit to change the current operating level of the indoor unit to the target operating level.

[0047] Adjusting the compressor frequency and expansion valve opening during indoor unit startup transforms the unit's current operating level into the target operating level. By adjusting the indoor unit's operating capacity, it quickly matches the room's load demand, preventing frequent start-ups and shutdowns and improving user experience.

[0048] The compressor starting frequency and indoor expansion valve opening of the outdoor unit are adjusted according to the current operating level of the indoor unit, so that the current operating level of the indoor unit is transformed into the target operating level.

[0049] By adjusting the compressor starting frequency and indoor expansion valve opening when the outdoor unit starts, the current operating level of the indoor unit can be further promoted to the target operating level.

[0050] Adjust the standby conditions of the indoor unit to change its current operating level to the target operating level, thereby reducing the number of times the indoor unit starts and stops within a specific time period.

[0051] The compressor starting frequency and indoor expansion valve opening when the outdoor unit starts, as well as the compressor frequency and indoor expansion valve opening when the indoor unit starts, can be calculated using existing technologies. The focus of this application is to adjust the compressor starting frequency and indoor expansion valve opening when the outdoor unit starts, as well as the compressor frequency and indoor expansion valve opening when the indoor unit starts, based on the current operating status level of the indoor unit, to obtain the adjusted compressor starting frequency and indoor expansion valve opening when the outdoor unit starts, as well as the compressor frequency and indoor expansion valve opening when the indoor unit starts. The adjusted parameters are then used to control the multi-split air conditioning system, so that the current operating level of the indoor unit is changed to the target operating level, avoiding frequent start-stop of the indoor unit and achieving energy-saving effect.

[0052] The current operating level of the indoor unit is determined by the number of start / stop cycles within a specific time period after the outdoor unit starts and the indoor unit starts for the first time and then goes into standby mode.

[0053] The more times the indoor unit starts / stops within a specific time period, the worse the current operating level of the indoor unit is. The greater the adjustment required for the compressor starting frequency and indoor expansion valve opening when the outdoor unit starts, and the compressor frequency and indoor expansion valve opening when the indoor unit starts.

[0054] The fewer times the indoor unit starts / stops within a specific time period, the better the current operating level of the indoor unit. This requires less adjustment to the compressor starting frequency and indoor expansion valve opening when the outdoor unit starts, and the compressor frequency and indoor expansion valve opening when the indoor unit starts.

[0055] In some embodiments, the number of times the indoor unit starts / stops within a specific time period is the number of times the indoor unit is started within that specific time period.

[0056] In some embodiments, the number of times the indoor unit starts / stops within a specific time period is the number of times the indoor unit is in standby mode within that specific time period.

[0057] In some embodiments, the operating status level standard of the indoor unit is determined in advance based on big data.

[0058] By reading the operating data of multi-split air conditioning units for cooling and heating in different seasons over a period of time using big data, and combining this with the frequent start-stop states of the air conditioning system, the operating status levels of the indoor units are classified.

[0059] exist Figures 2-3 The example categorizes the operating status of the indoor unit into three levels: Excellent, Good, and Poor. Excellent indicates that the number of start-stop cycles of the indoor unit is within the normal range and meets the requirements; Good indicates that the number of start-stop cycles of the indoor unit is relatively frequent and does not meet the requirements; Poor indicates that the number of start-stop cycles of the indoor unit is frequent and seriously fails to meet the requirements.

[0060] Therefore, changing the current operating level of the indoor unit to the target operating level means changing from good or poor to excellent.

[0061] exist Figure 2 In the example, the operating status levels of the indoor unit under cooling conditions are classified as follows: When the indoor unit is started and the operating mode is cooling mode; the indoor unit changes from SW OFF to SW ON, and the initial operating state changes from TH ON to TH OFF and a specific time T is recorded; within the specific time T, the number of times the indoor unit is ON is less than or equal to the first time threshold, or the number of times the indoor unit is OFF is less than or equal to the first time threshold; the operating state level of the indoor unit is determined to be excellent.

[0062] When the indoor unit is started and the operating mode is cooling mode; the indoor unit changes from SW OFF to SW ON, and the initial operating state changes from TH ON to TH OFF and a specific time T is recorded; within the specific time T, if the first count threshold < the number of times the indoor unit appears ON ≤ the second count threshold, or if the first count threshold < the number of times the indoor unit appears OFF ≤ the second count threshold; the operating status level of the indoor unit is determined to be good.

[0063] When the indoor unit is started and the operating mode is cooling mode; the indoor unit changes from SW OFF to SW ON, and the initial operating state changes from TH ON to TH OFF and a specific time T is recorded; within the specific time T, if the second count threshold is less than the number of times the indoor unit appears ON, or if the second count threshold is less than the number of times the indoor unit appears OFF, the operating state level of the indoor unit is determined to be poor.

[0064] Among them, SW OFF means the indoor unit is off, SW ON means the indoor unit is on, TH ON means the indoor unit is on, and TH OFF means the indoor unit is in standby mode.

[0065] The threshold for the first count is less than the threshold for the second count.

[0066] exist Figure 3 In the example, the operating status levels of the indoor unit under heating conditions are classified as follows: When the indoor unit is started and the operating mode is heating mode; the indoor unit changes from SW OFF to SW ON, and the initial operating state changes from TH ON to TH OFF and a specific time T is recorded; within the specific time T, the number of times the indoor unit is ON is less than or equal to the first time threshold, or the number of times the indoor unit is OFF is less than or equal to the first time threshold; the operating state level of the indoor unit is determined to be excellent.

[0067] When the indoor unit is started and the operating mode is heating mode; the indoor unit changes from SW OFF to SW ON, and the initial operating state changes from TH ON to TH OFF and a specific time T is recorded; within the specific time T, if the first count threshold < the number of times the indoor unit appears ON ≤ the second count threshold, or if the first count threshold < the number of times the indoor unit appears OFF ≤ the second count threshold, the operating status of the indoor unit is determined to be good.

[0068] When the indoor unit is started and the operating mode is heating mode; the indoor unit changes from SW OFF to SW ON, and the initial operating state changes from TH ON to TH OFF and a specific time T is recorded; within the specific time T, if the second count threshold is less than the number of times the indoor unit appears ON, or if the second count threshold is less than the number of times the indoor unit appears OFF, the operating state level of the indoor unit is determined to be poor.

[0069] Among them, SW OFF means the indoor unit is off, SW ON means the indoor unit is on, TH ON means the indoor unit is on, and TH OFF means the indoor unit is in standby mode.

[0070] The threshold for the first count is less than the threshold for the second count.

[0071] The number of start / stop cycles of the indoor unit is monitored within a specific time period after the outdoor unit starts and the indoor unit starts for the first time and then goes into standby mode. In cooling mode, the frequency of start / stop cycles is monitored according to... Figure 2 Determine the current operating level of the indoor unit and the heating mode according to... Figure 3 Determine the current operating level of the indoor unit.

[0072] When the current operating level of the indoor unit is excellent, no adjustment is required. When the current operating level of the indoor unit is poor or good, the compressor starting frequency and indoor expansion valve opening when the outdoor unit starts, as well as the compressor frequency and indoor expansion valve opening when the indoor unit starts, can be adjusted to change the poor or good level to excellent.

[0073] The frequency control of the compressor includes adjusting the compressor starting frequency and adjusting the compressor frequency when a certain indoor unit starts.

[0074] The method for adjusting the compressor starting frequency is as follows: The compressor starting frequency of the outdoor unit is adjusted according to the current operating level of the indoor unit: the starting frequency of the compressor when it was last started is obtained, and the starting frequency adjustment coefficient is determined by the current operating level of the indoor unit. The starting frequency of the compressor when the outdoor unit starts is obtained by adjusting the starting frequency of the compressor during the last start by adjusting the starting frequency adjustment coefficient.

[0075] In some embodiments, the compressor starting frequency when the outdoor unit starts = starting frequency adjustment coefficient * the starting frequency when the compressor last started.

[0076] The starting frequency adjustment coefficient is a number between 0 and 1.

[0077] The starting frequency adjustment coefficient is positively correlated with the current operating level of the indoor unit.

[0078] The better the current operating level of the indoor unit, the larger the starting frequency adjustment coefficient, and the smaller the adjustment of the compressor's starting frequency; the worse the current operating level of the indoor unit, the smaller the starting frequency adjustment coefficient, and the larger the adjustment of the compressor's starting frequency.

[0079] The compressor's starting frequency is limited to a maximum and a minimum starting frequency. The adjustment range of the compressor's starting frequency is between the maximum and minimum starting frequencies during the starting phase to ensure stable compressor startup.

[0080] When the calculated compressor starting frequency of the adjusted outdoor unit is higher than the maximum starting frequency, the maximum starting frequency shall be used as the compressor starting frequency of the outdoor unit.

[0081] When the calculated, adjusted compressor starting frequency of the outdoor unit is lower than the minimum starting frequency, the minimum starting frequency is used as the compressor starting frequency of the outdoor unit.

[0082] The method for adjusting the compressor frequency is as follows: Obtain the compressor frequency at the moment before the indoor unit starts, calculate the compressor frequency at the moment the indoor unit starts, and determine the compressor frequency adjustment coefficient based on the current operating level of the indoor unit; The compressor frequency at startup of the indoor unit is obtained by adjusting the compressor frequency at the current moment and the compressor frequency at the previous moment using the compressor frequency adjustment coefficient.

[0083] In some embodiments, the adjusted compressor frequency at startup of the indoor unit = compressor frequency adjustment coefficient * (compressor frequency at the current moment of indoor unit startup - compressor frequency at the moment before indoor unit startup) + compressor frequency at the moment before indoor unit startup; The compressor frequency regulation coefficient is a number between 0 and 1.

[0084] The compressor frequency regulation coefficient is positively correlated with the current operating level of the indoor unit.

[0085] The better the current operating level of the indoor unit, the larger the compressor frequency regulation coefficient, and the smaller the adjustment of the compressor starting frequency; the worse the current operating level of the indoor unit, the smaller the compressor frequency regulation coefficient, and the larger the adjustment of the compressor starting frequency.

[0086] The compressor frequency during indoor unit startup is limited to a maximum and a minimum compressor frequency. The compressor frequency during indoor unit startup is adjusted within the range between the minimum and maximum frequencies during normal control to ensure stable compressor operation.

[0087] When the calculated compressor frequency at the start of the adjusted indoor unit is higher than the maximum compressor frequency, the maximum compressor frequency is used as the compressor frequency at the start of the indoor unit.

[0088] When the calculated compressor frequency at the start of the indoor unit is lower than the minimum compressor frequency, the minimum compressor frequency is used as the compressor frequency at the start of the indoor unit.

[0089] exist Figure 4 In the example, the control scheme for compressor frequency in cooling mode differential switching is as follows: When the indoor unit of the air conditioner is running in cooling mode, and the current operating level of the indoor unit is judged as poor or memorized as poor, when the outdoor unit switches from thermo off (standby) to thermo on (start), the compressor starting frequency Hzstart(n) of the adjusted outdoor unit at startup is = the first starting frequency adjustment coefficient * the compressor's last starting frequency Hzstart(n-1).

[0090] The adjustment range of the compressor starting frequency Hzstart when the outdoor unit starts is: Hmin≤Hzstart≤Hmax.

[0091] Hmin is the minimum starting frequency during the starting phase, and Hmax is the maximum starting frequency during the starting phase.

[0092] When the indoor unit of the air conditioner is running in cooling mode, and the current operating level of the indoor unit is judged as poor or remembered as poor, and the outdoor unit is running while the indoor unit is in thermo-off (standby) and then switches to thermo-on (start), the compressor frequency F'(n) of the indoor unit at the start after adjustment is = the first compressor frequency adjustment coefficient * {the compressor frequency F(n) at the current moment of indoor unit start-up - the compressor frequency F(n-1) at the moment before indoor unit start-up} + the compressor frequency F(n-1) at the moment before indoor unit start-up.

[0093] The adjustment range of the compressor frequency F'(n) when the indoor unit starts is: Fmin≤ compressor frequency F'(n) when the indoor unit starts≤Fmax.

[0094] Fmin is the minimum frequency during the normal control phase, and Fmax is the maximum frequency during the normal control phase.

[0095] exist Figure 5In the example, the compressor frequency control scheme is used to switch from good to excellent cooling mode: When the indoor unit of the air conditioner is running in cooling mode, and the current operating level of the indoor unit is determined to be good or remembered as good, when the outdoor unit changes from thermo off (standby) to thermo on (start), the compressor starting frequency Hzstart(n) of the adjusted outdoor unit at startup is = the second starting frequency adjustment coefficient * the compressor's previous starting frequency Hzstart(n-1).

[0096] The adjustment range of the compressor starting frequency Hzstart when the outdoor unit starts is: Hmin≤Hzstart≤Hmax.

[0097] Hmin is the minimum starting frequency during the starting phase, and Hmax is the maximum starting frequency during the starting phase.

[0098] When the indoor unit of the air conditioner is running in cooling mode, and the current operating level of the indoor unit is determined to be good or is remembered as good, and the outdoor unit is running while the indoor unit is in thermo-off (standby) and then switches to thermo-on (start), the compressor frequency F'(n) of the indoor unit at the start after adjustment is = the second compressor frequency adjustment coefficient * {the compressor frequency F(n) at the current moment of indoor unit start-up - the compressor frequency F(n-1) at the moment before indoor unit start-up} + the compressor frequency F(n-1) at the moment before indoor unit start-up.

[0099] The adjustment range of the compressor frequency F'(n) when the indoor unit starts is: Fmin≤ compressor frequency F'(n) when the indoor unit starts≤Fmax.

[0100] Fmin is the minimum frequency during the normal control phase, and Fmax is the maximum frequency during the normal control phase.

[0101] Among them, the first starting frequency adjustment coefficient is less than the second starting frequency adjustment coefficient, and the first compressor frequency adjustment coefficient is less than the second compressor frequency adjustment coefficient.

[0102] In some embodiments, the first starting frequency adjustment coefficient is the same as the first compressor frequency adjustment coefficient.

[0103] In some embodiments, the first starting frequency adjustment coefficient is different from the first compressor frequency adjustment coefficient.

[0104] In some embodiments, the second starting frequency adjustment coefficient is the same as the second compressor frequency adjustment coefficient.

[0105] In some embodiments, the second starting frequency adjustment coefficient is different from the second compressor frequency adjustment coefficient.

[0106] existFigure 6 In the example, the control scheme for compressor frequency is optimized for differential switching in heating mode: When the indoor unit of the air conditioner is running in heating mode, and the current operating level of the indoor unit is judged as poor or memorized as poor, when the outdoor unit switches from thermo off (standby) to thermo on (start), the compressor starting frequency Hzstart(n) of the adjusted outdoor unit at startup is = the third starting frequency adjustment coefficient * the starting frequency Hzstart(n-1) of the compressor at the last startup.

[0107] The adjustment range of the compressor starting frequency Hzstart when the outdoor unit starts is: Hmin≤Hzstart≤Hmax.

[0108] Hmin is the minimum starting frequency during the starting phase, and Hmax is the maximum starting frequency during the starting phase.

[0109] When the indoor unit of the air conditioner is in heating mode, and the current operating level of the indoor unit is judged as poor or remembered as poor, and the outdoor unit is running while the indoor unit is in standby mode and the thermo off mode is switched to thermo on mode, the compressor frequency F'(n) of the indoor unit at the start after adjustment is = the third compressor frequency adjustment coefficient * {the compressor frequency F(n) at the current moment of indoor unit start-up - the compressor frequency F(n-1) at the moment before indoor unit start-up} + the compressor frequency F(n-1) at the moment before indoor unit start-up.

[0110] The adjustment range of the compressor frequency F'(n) when the indoor unit starts is: Fmin≤ compressor frequency F'(n) when the indoor unit starts≤Fmax.

[0111] Fmin is the minimum frequency during the normal control phase, and Fmax is the maximum frequency during the normal control phase.

[0112] exist Figure 7 In the example, the compressor frequency control scheme is used to improve the heating mode: When the indoor unit of the air conditioner is running in heating mode, and the current operating level of the indoor unit is determined to be good or remembered as good, when the outdoor unit changes from thermo off (standby) to thermo on (start), the compressor starting frequency Hzstart(n) of the adjusted outdoor unit at startup is = fourth starting frequency adjustment coefficient * compressor last starting frequency Hzstart(n-1).

[0113] The adjustment range of the compressor starting frequency Hzstart when the outdoor unit starts is: Hmin≤Hzstart≤Hmax.

[0114] Hmin is the minimum starting frequency during the starting phase, and Hmax is the maximum starting frequency during the starting phase.

[0115] When the indoor unit of the air conditioner is in heating mode, and the current operating level of the indoor unit is determined to be good or is remembered as good, and the outdoor unit is running while the indoor unit is in standby mode and is switching from thermo off to thermo on mode, the adjusted compressor frequency F'(n) when the indoor unit starts is equal to the fourth compressor frequency adjustment coefficient * {the compressor frequency F(n) at the current moment of indoor unit start-up - the compressor frequency F(n-1) at the moment before indoor unit start-up} + the compressor frequency F(n-1) at the moment before indoor unit start-up.

[0116] The adjustment range of the compressor frequency F'(n) when the indoor unit starts is: Fmin≤ compressor frequency F'(n) when the indoor unit starts≤Fmax.

[0117] Fmin is the minimum frequency during the normal control phase, and Fmax is the maximum frequency during the normal control phase.

[0118] Among them, the third starting frequency adjustment coefficient is less than the fourth starting frequency adjustment coefficient; the third compressor frequency adjustment coefficient is less than the fourth compressor frequency adjustment coefficient.

[0119] In some embodiments, the third starting frequency adjustment coefficient is the same as the third compressor frequency adjustment coefficient.

[0120] In some embodiments, the third starting frequency adjustment coefficient is different from the third compressor frequency adjustment coefficient.

[0121] In some embodiments, the fourth starting frequency adjustment coefficient is the same as the fourth compressor frequency adjustment coefficient.

[0122] In some embodiments, the fourth starting frequency adjustment coefficient is different from the fourth compressor frequency adjustment coefficient.

[0123] The control of the indoor electronic expansion valve includes the control of the opening degree of the indoor electronic expansion valve when the outdoor unit starts and the control of the opening degree of the indoor electronic expansion valve when the indoor unit starts.

[0124] The adjustment method for controlling the opening degree of the indoor electronic expansion valve when the outdoor unit starts is as follows: Adjust the opening of the indoor expansion valve when the outdoor unit starts up according to the current operating level of the indoor unit: obtain the maximum opening of the indoor expansion valve, and determine the adjustment coefficient of the maximum opening of the indoor expansion valve based on the current operating level of the indoor unit; The opening degree of the indoor expansion valve when the outdoor unit starts is obtained by adjusting the maximum opening degree of the indoor expansion valve by adjusting the maximum opening degree adjustment coefficient of the indoor expansion valve.

[0125] In some embodiments, the opening degree of the indoor expansion valve when the outdoor unit starts = the adjustment coefficient of the maximum opening degree of the indoor expansion valve * the maximum opening degree of the indoor expansion valve; The maximum opening adjustment coefficient of the indoor expansion valve is a number between 0 and 1.

[0126] The adjustment range of the indoor expansion valve opening is between a* the initial opening and the maximum opening of the indoor expansion valve, where a is a number between 0 and 1.

[0127] When an indoor unit starts up, the method for controlling the opening of the corresponding indoor electronic expansion valve is as follows: Obtain the opening degree of the indoor expansion valve just before the indoor unit starts, and determine the adjustment coefficient of the indoor expansion valve opening degree based on the current operating level of the indoor unit; adjust the opening degree of the indoor expansion valve just before the indoor unit starts using the adjustment coefficient of the indoor expansion valve opening degree to obtain the opening degree of the indoor expansion valve when the indoor unit starts.

[0128] In some embodiments, the opening degree of the electronic expansion valve when the indoor unit starts = indoor expansion valve opening adjustment coefficient * indoor expansion valve opening degree just before the indoor unit starts.

[0129] The opening adjustment coefficient of the indoor expansion valve is a number between 0 and 1.

[0130] The adjustment range of the indoor expansion valve opening is between a* the initial opening and the maximum opening of the indoor expansion valve, where a is a number between 0 and 1.

[0131] exist Figure 8 In the example, the control scheme for the opening of the indoor expansion valve is optimized for differential switching in cooling mode: When the indoor unit of the air conditioner is running in cooling mode, and the current operating level of the indoor unit is judged as poor or remembered as poor, when the outdoor unit switches from thermo off (standby) to thermo on (start), the opening degree of the indoor expansion valve EVI(n) when the outdoor unit starts is equal to the first maximum opening degree adjustment coefficient * EVImax.

[0132] When the indoor unit of the air conditioner is running in cooling mode, and the current operating level of the indoor unit is judged as poor or remembered as poor, and the outdoor unit is running while the indoor unit is in standby mode and the thermo off (standby) mode is switched to thermo on (start), the opening degree of the indoor expansion valve when the indoor unit starts is EVI(n) = first opening degree adjustment coefficient * EVI(n-1).

[0133] The adjustment range of the indoor expansion valve opening EVI(n) is between a*EVIHP and EVImax.

[0134] Where EVImax is the maximum opening of the indoor expansion valve, EVI(n-1) is the opening of the indoor expansion valve when the machine stopped at the previous moment, and EVIHP is the initial opening of the indoor expansion valve.

[0135] exist Figure 9 In the example, the control scheme for the opening of the indoor expansion valve is as follows: (This is for switching from good to excellent cooling mode.) When the indoor unit of the air conditioner is running in cooling mode, and the current operating level of the indoor unit is determined to be good or is remembered as good, when the outdoor unit switches from thermo off (standby) to thermo on (start), the opening degree of the indoor expansion valve EVI(n) when the outdoor unit starts is equal to the second maximum opening degree adjustment coefficient * EVImax.

[0136] When the indoor unit of the air conditioner is running in cooling mode, and the current operating level of the indoor unit is determined to be poor or is remembered as poor, and the outdoor unit is running while the indoor unit is in standby mode and is switching from thermo off (standby) to thermo on (start), the opening degree of the indoor expansion valve EVI(n) when the indoor unit starts is equal to the second opening degree adjustment coefficient * EVI(n-1).

[0137] The adjustment range of the indoor expansion valve opening EVI(n) is between a*EVIHP and EVImax.

[0138] Where EVImax is the maximum opening of the indoor expansion valve, EVI(n-1) is the opening of the indoor expansion valve when the machine stopped at the previous moment, and EVIHP is the initial opening of the indoor expansion valve.

[0139] The first maximum opening adjustment coefficient is less than the second maximum opening adjustment coefficient, and the first opening adjustment coefficient is less than the second opening adjustment coefficient.

[0140] exist Figure 10 In the example, the control scheme for the opening of the indoor expansion valve is optimized for differential switching in heating mode: When the indoor unit of the air conditioner is running in heating mode, and the current operating level of the indoor unit is judged as poor or remembered as poor, when the outdoor unit switches from thermo off (standby) to thermo on (start), the opening degree of the indoor expansion valve EVI(n) when the outdoor unit starts is = the third maximum opening degree adjustment coefficient * EVImax.

[0141] When the indoor unit of the air conditioner is running in heating mode, and the current operating level of the indoor unit is judged as poor or remembered as poor, and the outdoor unit is running while the indoor unit is in standby mode and the thermo off (standby) mode is switched to thermo on (start), the opening degree of the indoor expansion valve EVI(n) when the indoor unit starts is equal to the third opening degree adjustment coefficient * EVI(n-1).

[0142] The adjustment range of the indoor expansion valve opening EVI(n) is between a*EVIHP and EVImax.

[0143] Where EVImax is the maximum opening of the indoor expansion valve, EVI(n-1) is the opening of the indoor expansion valve when the machine stopped at the previous moment, and EVIHP is the initial opening of the indoor expansion valve.

[0144] exist Figure 11 In the example, the control scheme for the opening of the indoor expansion valve is used to improve the heating mode: When the indoor unit of the air conditioner is running in heating mode, and the current operating level of the indoor unit is determined to be good or is remembered as good, when the outdoor unit switches from thermo off (standby) to thermo on (start), the opening degree of the indoor expansion valve EVI(n) when the outdoor unit starts is equal to the fourth maximum opening degree adjustment coefficient * EVImax.

[0145] When the indoor unit of the air conditioner is in heating mode, and the current operating level of the indoor unit is judged as poor or remembered as poor, and the outdoor unit is running while the indoor unit is in standby mode and the thermo off (standby) mode is switched to thermo on (start), the opening degree of the indoor expansion valve EVI(n) when the indoor unit starts is equal to the fourth opening degree adjustment coefficient * EVI(n-1).

[0146] The adjustment range of the indoor expansion valve opening EVI(n) is between a*EVIHP and EVImax.

[0147] Where EVImax is the maximum opening of the indoor expansion valve, EVI(n-1) is the opening of the indoor expansion valve when the machine stopped at the previous moment, and EVIHP is the initial opening of the indoor expansion valve.

[0148] The third maximum opening adjustment coefficient is less than the fourth maximum opening adjustment coefficient, and the third opening adjustment coefficient is less than the fourth opening adjustment coefficient.

[0149] Based on the current operating level of the indoor unit, adjust the standby conditions of the indoor unit: lower the cooling set temperature for the indoor unit to enter standby mode or raise the heating set temperature for the indoor unit to enter standby mode.

[0150] exist Figure 12 In the example, when the current operating level of the indoor unit is poor or the memory is poor, the next Thermo off (indoor unit standby) condition is: Ti < Ts - first cooling setpoint when in cooling mode; and the next Thermo off (indoor unit standby) condition is: Ti ≥ Ts + first heating setpoint when in heating mode.

[0151] exist Figure 13 In the example, when the current operating level of the indoor unit is good or the memory is good, the next Thermo off (indoor unit standby) condition is: Ti < Ts - second cooling setting value when in cooling mode; and the next Thermo off (indoor unit standby) condition is: Ti ≥ Ts + second heating setting value when in heating mode.

[0152] Wherein, the first cooling setting value > the second cooling setting value, and the first heating setting value > the second heating setting cooling value.

[0153] Reduce the number of times the indoor unit starts and stops by adjusting the standby conditions until the current operating level of the indoor unit is determined to be excellent.

[0154] 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.

[0155] 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, the multi-split system comprising an outdoor unit and at least two indoor units, each indoor unit comprising an indoor expansion valve, characterized in that, The current operating level of the indoor unit is determined based on the number of start / stop cycles within a specific time period after the outdoor unit starts and the indoor unit starts for the first time and then goes into standby mode; The compressor frequency and indoor expansion valve opening at startup of the indoor unit are adjusted according to the current operating level of the indoor unit so that the current operating level of the indoor unit is changed to the target operating level.

2. The multi-unit air conditioning system according to claim 1, characterized in that, Obtain the compressor frequency at the moment before the indoor unit starts, calculate the compressor frequency at the moment the indoor unit starts, and determine the adjustment coefficient based on the current operating level of the indoor unit; The compressor frequency at startup of the indoor unit is obtained by adjusting the compressor frequency at the current moment and the compressor frequency at the previous moment using the adjustment coefficient.

3. The multi-unit air conditioning system according to claim 2, characterized in that, The adjusted compressor frequency at startup = adjustment coefficient * (compressor frequency at the current moment of startup - compressor frequency at the moment before startup) + compressor frequency at the moment before startup. The adjustment coefficient is a number between 0 and 1.

4. The multi-unit air conditioning system according to claim 1, characterized in that, The opening degree of the indoor expansion valve at the moment before the indoor unit starts is obtained, and the adjustment coefficient is determined based on the current operating level of the indoor unit. The opening degree of the indoor expansion valve at the moment before the indoor unit starts is adjusted using the adjustment coefficient to obtain the adjusted opening degree of the indoor expansion valve when the indoor unit starts.

5. The multi-unit air conditioning system according to claim 4, characterized in that, The adjusted opening degree of the electronic expansion valve when the indoor unit starts = adjustment coefficient * opening degree of the indoor expansion valve a moment before the indoor unit starts; The adjustment coefficient is a number between 0 and 1.

6. The multi-unit air conditioning system according to claim 1, characterized in that, The starting frequency of the compressor when the outdoor unit starts is adjusted according to the current operating level of the indoor unit: the starting frequency of the compressor when it last started is obtained, and the adjustment coefficient is determined by the current operating level of the indoor unit; The compressor starting frequency when the outdoor unit starts is obtained by adjusting the starting frequency of the compressor at the last start by the adjustment coefficient.

7. The multi-unit air conditioning system according to claim 6, characterized in that, The compressor starting frequency when the outdoor unit starts = the adjustment coefficient * the compressor's previous starting frequency; The adjustment coefficient is a number between 0 and 1.

8. The multi-unit air conditioning system according to claim 1, characterized in that, The opening of the indoor expansion valve when the outdoor unit starts is adjusted according to the current operating level of the indoor unit: the maximum opening of the indoor expansion valve is obtained, and the adjustment coefficient is determined by the current operating level of the indoor unit; The opening degree of the indoor expansion valve when the outdoor unit starts is obtained by adjusting the maximum opening degree of the indoor expansion valve using the adjustment coefficient.

9. The multi-unit air conditioning system according to claim 8, characterized in that, The opening degree of the indoor expansion valve when the outdoor unit starts = the adjustment coefficient * the maximum opening degree of the indoor expansion valve; The adjustment coefficient is a number between 0 and 1.

10. The multi-unit air conditioning system according to any one of claims 1-9, characterized in that, Based on the current operating level of the indoor unit, adjust the standby conditions of the indoor unit: lower the cooling set temperature for the indoor unit to enter standby mode or raise the heating set temperature for the indoor unit to enter standby mode.

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