Control method of multi-split air conditioner, controller, multi-split air conditioner and medium

Abstract

The embodiment of the invention provides a multi-split air conditioner control method, a controller, a multi-split air conditioner and a medium. The multi-split air conditioner control method comprises the steps that the indoor temperature, the maximum rated energy requirement and the minimum rated energy requirement of all indoor units in the running state are obtained; the temperature difference value between the indoor temperature and the set temperature and the energy demand difference value between the maximum rated energy demand and the minimum rated energy demand are determined; when the temperature difference value and the energy demand difference value meet the preset correction condition, a target indoor unit with the difference value between the maximum rated energy demand and the target indoor unit reaching the preset energy demand difference value is determined, the target superheat degree of the target indoor unit is corrected, and the opening degree of a throttling assembly corresponding to the target indoor unit is adjusted according to the target superheat degree; and the target temperature of an indoor unit coil of the multi-split air conditioner is determined according to the temperature difference value of the indoor units, and the operation frequency of a compressor is adjusted according to the received actual temperature of the indoor unit coil and the target temperature of the indoor unit coil. According to the embodiment of the invention, temperature fluctuation can be reduced, and the thermal comfort of a user is improved.

Description

Technical Field

[0001] The present application relates to the technical field of air-conditioning equipment, and in particular to a control method, a controller, a multi-split air conditioner and a medium. Background Art

[0002] In related technologies, the load scenarios faced by multi-split air conditioners are relatively complex. For example, when the indoor units of a large room and a small room are turned on at the same time, for the stable operation stage after the temperature drops, in the current control, the system uses the indoor temperature of the most unfavorable loaded indoor unit as the system's adjustment standard. At this time, in order to take into account the room with a larger load, the system will still maintain a large output, while the other room with a smaller load is prone to a shutdown due to reaching the temperature, resulting in the room where the indoor unit is located being hot and cold, and the temperature fluctuates greatly, making the user uncomfortable. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a control method, controller, multi-split air conditioner, and medium for a multi-split air conditioner. The purpose is to ensure that, while ensuring that indoor units with high load demands can maintain stable output for a longer period of time, indoor units with low load demands can also maintain stable output, thereby reducing temperature fluctuations and improving user thermal comfort.

[0004] In a first aspect, an embodiment of the present application provides a method for controlling a multi-split air conditioner, the method comprising:

[0005] Obtaining the indoor temperature, maximum rated energy demand, and minimum rated energy demand of all indoor units in operation, and determining a temperature difference between the indoor temperature and a set temperature, and an energy demand difference between the maximum rated energy demand and the minimum rated energy demand;

[0006] When the temperature difference and the energy demand difference meet a preset correction condition, determining a target indoor unit whose difference from the maximum rated energy demand reaches a preset energy demand difference, correcting a target superheat of the target indoor unit, and adjusting the opening of a throttling component corresponding to the target indoor unit according to the target superheat;

[0007] The target temperature of the indoor coil of the multi-split air conditioner is determined according to the temperature difference of the indoor unit, and the operating frequency of the compressor is adjusted according to the received actual temperature of the indoor coil and the target temperature of the indoor coil.

[0008] According to some embodiments of the present application, the preset correction condition includes:

[0009] The energy demand difference between the maximum rated energy demand and the minimum rated energy demand is greater than the preset energy demand difference;

[0010] The accumulated operating time of all the indoor units in which the temperature differences are less than zero is greater than a preset operating time.

[0011] According to some embodiments of the present application, the correcting the target superheat of the target indoor unit includes:

[0012] Obtaining a reference superheat corresponding to the indoor unit with the maximum rated energy demand;

[0013] For the target indoor unit, a target superheat degree of the target indoor unit is determined according to the reference superheat degree and a preset incremental superheat degree.

[0014] According to some embodiments of the present application, determining the target temperature of the indoor coil of the multi-split air conditioner according to the temperature difference of the indoor unit includes:

[0015] Determining a first temperature difference corresponding to the indoor unit with the maximum rated energy demand;

[0016] When the first temperature difference is within a preset temperature range, maintaining the target temperature of the indoor unit coil unchanged;

[0017] When the first temperature difference is outside the preset temperature range, a target correction temperature is determined according to the first temperature difference and the temperature differences of all the indoor units, and the target temperature of the indoor unit coil is adjusted according to the target correction temperature and a preset correction coefficient.

[0018] According to some embodiments of the present application, determining the target corrected temperature based on the first temperature difference and the temperature differences of all the indoor units includes one of the following:

[0019] When the first temperature difference is less than the lower limit of the preset temperature interval, selecting the minimum temperature from the temperature differences of all the indoor units as the target correction temperature;

[0020] When the first temperature difference is greater than the upper limit of the preset temperature interval and less than a preset temperature threshold, a minimum temperature and a maximum temperature are selected from the temperature differences of all the indoor units, and a target correction temperature is determined based on a first weight coefficient and the minimum temperature and a second weight coefficient and the maximum temperature, wherein the first weight coefficient corresponds to the minimum temperature and the second weight coefficient corresponds to the maximum temperature;

[0021] When the first temperature difference is greater than the preset temperature threshold, a maximum temperature is selected from the temperature differences of all the indoor units as a target correction temperature.

[0022] According to some embodiments of the present application, the adjusting the operation frequency of the compressor according to the received actual temperature of the indoor unit coil and the target temperature of the indoor unit coil comprises:

[0023] obtaining a rated capacity of the indoor unit;

[0024] performing a weighted average according to the rated capacity and the actual temperature of the indoor unit coil to obtain a weighted average temperature of the indoor unit coil;

[0025] adjusting the operation frequency of the compressor according to a difference between the weighted average temperature of the indoor unit coil and the target temperature of the indoor unit coil.

[0026] According to some embodiments of the present application, the adjusting the operation frequency of the compressor according to the difference between the weighted average temperature of the indoor unit coil and the target temperature of the indoor unit coil comprises one of the following:

[0027] when the difference between the weighted average temperature of the indoor unit coil and the target temperature of the indoor unit coil is less than zero, decreasing the operation frequency of the compressor;

[0028] when the difference between the weighted average temperature of the indoor unit coil and the target temperature of the indoor unit coil is greater than zero, increasing the operation frequency of the compressor.

[0029] According to some embodiments of the present application, the method further comprises:

[0030] adjusting a temperature-reached shutdown temperature of the target indoor unit according to a first temperature difference corresponding to the indoor unit with the maximum rated capacity;

[0031] for the target indoor unit, determining an on-off state of the target indoor unit according to the temperature difference and the temperature-reached shutdown temperature.

[0032] According to some embodiments of the present application, the adjusting the temperature-reached shutdown temperature of the target indoor unit according to the first temperature difference corresponding to the indoor unit with the maximum rated capacity comprises:

[0033] determining a temperature-reached correction temperature according to the first temperature difference corresponding to the indoor unit with the maximum rated capacity;

[0034] taking a difference between a preset temperature-reached shutdown temperature and the temperature-reached correction temperature as a target temperature-reached shutdown temperature of the target indoor unit.

[0035] According to some embodiments of the present application, the determining the temperature-reached correction temperature according to the first temperature difference corresponding to the indoor unit with the maximum rated capacity comprises one of the following:

[0036] When the first temperature difference corresponding to the indoor unit with the maximum rated energy demand is less than the upper limit of the preset temperature range, the first preset temperature is used as the repair temperature positive temperature;

[0037] When the first temperature difference corresponding to the indoor unit with the maximum rated energy demand is greater than the upper limit of the preset temperature interval and less than the preset temperature threshold, a second preset temperature is used as the temperature correction temperature, wherein the second preset temperature is greater than the first preset temperature;

[0038] When the first temperature difference corresponding to the indoor unit with the maximum rated energy demand is greater than a preset temperature threshold, a third preset temperature is used as the temperature correction temperature, wherein the third preset temperature is greater than the second preset temperature.

[0039] In a second aspect, an embodiment of the present application provides a controller comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the control method of the multi-split air conditioner of the first aspect mentioned above when running the computer program.

[0040] In a third aspect, an embodiment of the present application provides a multi-split air conditioner, comprising the controller of the second aspect described above.

[0041] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the control method of the multi-split air conditioner as described in the first aspect above.

[0042] In a fifth aspect, an embodiment of the present application provides a computer program product, comprising a computer program or computer instructions, characterized in that the computer program or the computer instructions are stored in a computer-readable storage medium, a processor of a computer device reads the computer program or the computer instructions from the computer-readable storage medium, and the processor executes the computer program or the computer instructions, so that the computer device executes the control method of the multi-split air conditioner as described in the first aspect above.

[0043] According to the technical solution of the embodiment of the present application, there are at least the following beneficial effects: the embodiment of the present application determines whether to enter the load unevenness correction control by judging the rated energy demand and real-time load status of the currently running indoor unit. In the load unevenness correction control, by changing the system's indoor unit coil target temperature and the indoor unit's target superheat and other correction methods, it is possible to balance the system output and the differentiated demands of different indoor units. On the basis of ensuring the indoor unit with large load demand, the indoor unit with small load demand can also extend the time to maintain stable output, reduce the temperature fluctuation caused by the indoor unit, and increase the user's thermal comfort.

[0044] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are used to provide a further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0046] Figure 1 This is a flow chart of a method for controlling a multi-split air conditioner provided by one embodiment of the present application;

[0047] Figure 2 is a flow chart of a method for controlling a multi-split air conditioner provided by another embodiment of the present application;

[0048] Figure 3 is a flow chart of a method for controlling a multi-split air conditioner provided by another embodiment of the present application;

[0049] Figure 4 is a flow chart of a method for controlling a multi-split air conditioner provided by another embodiment of the present application;

[0050] Figure 5 is a flow chart of a method for controlling a multi-split air conditioner provided by another embodiment of the present application;

[0051] Figure 6 is a flow chart of a method for controlling a multi-split air conditioner provided by another embodiment of the present application;

[0052] Figure 7 This is an overall flow chart of a control method for a multi-split air conditioner provided by an embodiment of the present application;

[0053] Figure 8 This is a schematic diagram of temperature ranges provided by an embodiment of the present application;

[0054] Figure 9 This is a schematic diagram of a controller for executing a control method for a multi-split air conditioner provided in one embodiment of the present application. DETAILED DESCRIPTION

[0055] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0056] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by the upper, lower, front, rear, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0057] In the description of the present application, one or more is understood as one or more, more than two is understood as more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If the first, second is described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0058] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0059] In some cases, the multi-split air conditioner faces a complex load scenario, for example, when the indoor units of a large room and a small room are turned on at the same time (the air conditioner indoor units of the living room and the bedroom are turned on at the same time), for the stable running stage after temperature drop, the system in the current control takes the indoor temperature of the most unfavorable load indoor unit as the adjustment standard of the system, at this time, the system will still maintain a large output in order to take into account the room with larger load, and the room with smaller load is easy to appear temperature fluctuation and frequent start-stop, resulting in the room where the indoor unit is located being cold and hot, and the temperature fluctuation being large, which makes the user uncomfortable.

[0060] Based on the above situation, for the running scenario of the multi-split air conditioner with large load difference between the indoor units, and easy to cause frequent start-stop and large temperature fluctuation of the indoor unit with small load, the present application embodiment proposes a control method, a controller, a multi-split air conditioner and a medium of the multi-split air conditioner. By judging the rated power demand size and real-time load state of the current running indoor unit, it is judged whether to enter the uneven load correction control. In the uneven load correction control, by changing the calculation method of the indoor unit coil target temperature of the system, the correction method of the indoor unit target superheat degree, and the temperature reaching condition of the indoor unit with small load demand, the difference between the system output and the differentiated demand of different indoor units is maximized. On the basis of ensuring the indoor unit with large load demand, the indoor unit with small load demand can also prolong the time of maintaining stable output, reduce the temperature fluctuation caused by the start-stop of the indoor unit, and increase the thermal comfort of the user.

[0061] The control method of the multi-split air conditioner of the present application will be further described below in combination with the drawings.

[0062] like Figure 1 As shown, Figure 1 This is a flowchart of a control method for a multi-split air conditioner provided by an embodiment of the present application; the control method for a multi-split air conditioner may include but is not limited to step S110, step S120 and step S130.

[0063] Step S110: Acquire the indoor temperature, maximum rated energy demand, and minimum rated energy demand of all indoor units in operation, and determine the temperature difference between the indoor temperature and the set temperature, and the energy demand difference between the maximum rated energy demand and the minimum rated energy demand;

[0064] Step S120: When the temperature difference and the energy demand difference meet a preset correction condition, a target indoor unit whose difference from the maximum rated energy demand reaches the preset energy demand difference is determined, a target superheat of the target indoor unit is corrected, and the opening of the throttling component corresponding to the target indoor unit is adjusted according to the target superheat;

[0065] Step S130: determining the target temperature of the indoor coils of the multi-split air conditioner according to the temperature difference of the indoor units, and adjusting the operating frequency of the compressor according to the received actual temperature of the indoor coils and the target temperature of the indoor coils.

[0066] In one embodiment, the embodiment of the present application determines whether to enter load unevenness correction control by judging the rated energy demand and real-time load status of the currently running indoor unit. In the load unevenness correction control, by changing the system's indoor unit coil target temperature and the indoor unit's target superheat and other correction methods, it is possible to balance the system output and the differentiated demands of different indoor units. On the basis of ensuring the indoor units with large load demands, the indoor units with small load demands can also extend the time to maintain stable output, reduce the temperature fluctuations caused by the indoor units, and increase the user's thermal comfort.

[0067] In one embodiment, the maximum rated energy demand and the minimum rated energy demand may be determined according to the model of the indoor unit and the actual operating status.

[0068] In one embodiment, the target indoor unit is an indoor unit with a smaller load. In addition, the throttling component may be a corresponding electronic expansion valve.

[0069] In one embodiment, the preset correction conditions include but are not limited to the following two conditions:

[0070] The first condition: the energy demand difference between the maximum rated energy demand and the minimum rated energy demand is greater than the preset energy demand difference; satisfying the first condition indicates that the multi-split air conditioner is currently operating multiple indoor units with large load differences at the same time.

[0071] The second condition is that the cumulative operating time of all indoor units with a temperature difference less than zero is greater than the preset operating time. If this second condition is met, it is determined that all currently running indoor units have reached the temperature within a certain period of time during operation, indicating that the rapid cooling period for all indoor units has been completed.

[0072] In addition, if Figure 2 As shown, Figure 2 This is a flow chart of a control method for a multi-split air conditioner provided by another embodiment of the present application; regarding the correction of the target superheat of the target indoor unit in the above-mentioned step S120, it may include but is not limited to step S210 and step S220.

[0073] Step S210: Obtain a reference superheat corresponding to the indoor unit with the maximum rated energy demand;

[0074] Step S220: For the target indoor unit, determine the target superheat of the target indoor unit according to the reference superheat and the preset incremental superheat.

[0075] In one embodiment, the control scheme uses a target superheat to adjust the opening of the electronic expansion valve of each indoor unit. Assuming the reference superheat of the indoor unit with the highest rated capacity demand is SH_tar_0, for target indoor units whose capacity demand differs by more than 40% from the indoor unit with the highest rated capacity demand (for example, if the currently operating indoor unit with the highest rated capacity demand is 7.2 kW, then for the currently operating indoor units with a capacity demand of less than or equal to 4.32 kW), the target superheat of the corresponding target indoor unit is increased by a preset incremental superheat value ΔSH. The target superheat of the corresponding target indoor unit is adjusted to SH_tar_i = SH_tar_0 + ΔSH. The purpose of this step is to minimize the opening of the electronic expansion valve of the target indoor unit with the lowest load demand, thereby reducing the refrigerant flow rate.

[0076] In one embodiment, the above-mentioned preset incremental superheat ΔSH may be preset, and the embodiment of the present application does not specifically limit the value of the preset incremental superheat ΔSH.

[0077] In one embodiment, the preset incremental superheat degrees ΔSH of the target indoor units may be the same or different. For example, the preset incremental superheat degrees ΔSH may be determined according to the load requirements of the target indoor units.

[0078] In addition, if Figure 3 As shown, Figure 3This is a flowchart of a control method for a multi-split air conditioner provided by another embodiment of the present application; regarding the above-mentioned step S130 of determining the target temperature of the indoor coil of the multi-split air conditioner based on the temperature difference of the indoor unit, it may include but is not limited to step S310, step S320 and step S330.

[0079] Step S310: determining a first temperature difference corresponding to the indoor unit with the maximum rated energy requirement;

[0080] Step S320: When the first temperature difference is within the preset temperature range, the target temperature of the indoor unit coil is maintained unchanged;

[0081] Step S330: When the first temperature difference is outside the preset temperature range, a target correction temperature is determined based on the first temperature difference and the temperature differences of all indoor units, and the target temperature of the indoor unit coil is adjusted based on the target correction temperature and a preset correction coefficient.

[0082] In one embodiment, the embodiment of the present application can set a preset temperature interval, which is a load balancing area. If the first temperature difference is within the preset temperature interval, that is, the first temperature difference is within the load balancing area, then there is no need to adjust the target temperature of the indoor unit coil; if the first temperature difference is outside the preset temperature interval, that is, the first temperature difference is outside the load balancing area, then it is necessary to determine the target correction temperature based on the first temperature difference and the temperature differences of all indoor units, and adjust the target temperature of the indoor unit coil based on the target correction temperature and the preset correction coefficient.

[0083] In one embodiment, the above-mentioned preset temperature range may be preset, and the embodiment of the present application does not specifically limit the range value of the preset temperature range.

[0084] In one embodiment, the above-mentioned preset correction coefficient may be preset, and the embodiment of the present application does not specifically limit the value of the preset correction coefficient.

[0085] In one embodiment, the determination of the target correction temperature according to the first temperature difference and the temperature differences of all indoor units in step S330 may include but is not limited to the following situations:

[0086] The first case: when the first temperature difference is less than the lower limit of the preset temperature interval, the minimum temperature is selected from the temperature differences of all indoor units as the target correction temperature; when the first temperature difference △T_max is in the preset temperature interval, it means that the actual load demand of the indoor unit with the maximum rated demand is small. At this time, the indoor unit with the minimum load demand is used to correct the indoor unit coil target temperature: calculate the temperature difference between the indoor temperature of all running indoor units and the set temperature △T_i = T1_i-Ts_i, and the target correction temperature △T_load takes the minimum value of all indoor units △T_i. At this time, the indoor unit coil target temperature T2_target(t) = T2_target(t-1)-C*min(△T_i), where T1_i is the indoor temperature of the i-th indoor unit, Ts_i is the set temperature of the i-th indoor unit, and C is the preset correction coefficient.

[0087] The second case: when the first temperature difference is greater than the upper limit of the preset temperature interval and less than the preset temperature threshold, the minimum temperature and the maximum temperature are selected from the temperature differences of all indoor units, and the target correction temperature is determined according to the first weight coefficient and the minimum temperature and the second weight coefficient and the maximum temperature, wherein the first weight coefficient corresponds to the minimum temperature and the second weight coefficient corresponds to the maximum temperature; when the first temperature difference △T_max is greater than the upper limit of the preset temperature interval and less than the preset temperature threshold, it can be considered as a small load demand area, and the target temperature of the indoor unit coil is corrected by taking into account the actual load of the indoor unit with high load demand and the indoor unit with low load demand: the temperature difference between the indoor temperature of all running indoor units and the set temperature △T_i=T1_i-Ts_i is calculated, and the target correction temperature △T_load=K1*(min(△T_i))+K2*(max(△T_i)), wherein K1+K2=1, and the specific weights of K1 and K2 are determined according to experiments. At this time, the target temperature of the indoor unit coil is T2_target(t)=T2_target(t-1)-C*K1*((min(△T_i))+K2*(max(△T_i))). Here, K1 is the first weight coefficient, and K2 is the second weight coefficient.

[0088] Case 3: When the first temperature difference is greater than the preset temperature threshold, the maximum temperature among all indoor unit temperature differences is selected as the target correction temperature. When the first temperature difference ΔT_max is greater than the preset temperature threshold, this is considered a high-load demand zone. The target temperature of the indoor unit coil is corrected using the indoor unit with the highest load demand. The temperature difference between the indoor temperature of all operating indoor units and the set temperature is calculated as ΔT_i = T1_i - Ts_i. The target correction temperature ΔT_load is the maximum value of all ΔT_i. At this point, the target temperature of the indoor unit coil is T2_target(t) = T2_target(t-1) - C*max(ΔT_i).

[0089] In addition, as shown in Figure 4 , Figure 4 is a flow chart of a control method of a multi-split air conditioner according to another embodiment of the present application; regarding the step S130 of adjusting the operating frequency of the compressor according to the received actual temperature of the indoor coil and the target temperature of the indoor coil, it can include but is not limited to the step S410, the step S420 and the step S430.

[0090] The step S410 is to obtain the rated capacity of the indoor unit;

[0091] The step S420 is to obtain the weighted average temperature of the indoor coil by weighted average according to the rated capacity and the actual temperature of the indoor coil;

[0092] The step S430 is to adjust the operating frequency of the compressor according to the difference between the weighted average temperature of the indoor coil and the target temperature of the indoor coil.

[0093] In an embodiment, since the rated capacities of each indoor unit can be different, in order to obtain a more appropriate actual temperature of the indoor coil, the weighted average temperature of the indoor coil can be obtained by weighted average according to the rated capacity and the actual temperature of the indoor coil, so that the influence of the rated capacity of each indoor unit is considered, and finally the difference between the weighted average temperature of the indoor coil and the target temperature of the indoor coil is calculated, and the operating frequency of the compressor is adjusted according to the difference.

[0094] In an embodiment, regarding the step S430 of adjusting the operating frequency of the compressor according to the difference between the weighted average temperature of the indoor coil and the target temperature of the indoor coil, it can include but is not limited to the following several cases:

[0095] The first case: when the difference between the weighted average temperature of the indoor coil and the target temperature of the indoor coil is less than zero, the operating frequency of the compressor is reduced;

[0096] The second case: when the difference between the weighted average temperature of the indoor coil and the target temperature of the indoor coil is greater than zero, the operating frequency of the compressor is increased.

[0097] In addition, as shown in Figure 5 , Figure 5 is a flow chart of a control method of a multi-split air conditioner according to another embodiment of the present application; the control method of the multi-split air conditioner can further include but is not limited to the step S510 and the step S520.

[0098] The step S510 is to adjust the temperature reaching stop temperature of the target indoor unit according to the first temperature difference corresponding to the indoor unit with the maximum rated capacity;

[0099] Step S520: For the target indoor unit, determine the on state of the target indoor unit according to the temperature difference and the temperature reaching shutdown temperature.

[0100] In one embodiment, the embodiment of the present application will adjust the temperature-reaching shutdown condition of the target indoor unit with a small load according to the interval to which the first temperature difference △T_max=T1-Ts of the indoor temperature of the maximum rated demand indoor unit and the set temperature belongs, that is, adjust the temperature-reaching shutdown temperature of the target indoor unit, and then determine the on state of the target indoor unit based on the comparison result of the temperature difference in the target room and the temperature-reaching shutdown temperature.

[0101] In addition, if Figure 6 As shown, Figure 6 This is a flowchart of a method for controlling a multi-split air conditioner provided by another embodiment of the present application; regarding the above-mentioned step S510, it may include but is not limited to step S610 and step S620.

[0102] Step S610: determining a corrected temperature according to a first temperature difference corresponding to the indoor unit with the maximum rated energy demand;

[0103] Step S620: The difference between the preset temperature-reaching shutdown temperature and the temperature-reaching correction temperature is used as the target temperature-reaching shutdown temperature of the target indoor unit.

[0104] In one embodiment, according to the solution of the embodiment of the present application, the correction magnitude of the target shutdown temperature ΔT_thre_off is determined based on the interval of the first temperature difference ΔT_max. In the following parameters, ΔT_thre_off_xz1 < ΔT_thre_off_xz2 < ΔT_thre_off_xz3, where ΔT_thre_off_xz1, ΔT_thre_off_xz2, and ΔT_thre_off_xz3 are the aforementioned corrected shutdown temperatures.

[0105] Regarding the determination of the corrected temperature according to the first temperature difference corresponding to the indoor unit with the maximum rated energy demand in step S610, the following situations may be included but are not limited to:

[0106] The first case: when the first temperature difference corresponding to the indoor unit with the maximum rated energy demand is less than the upper limit of the preset temperature range, the first preset temperature is used as the positive temperature; when the first temperature difference △T_max is less than the upper limit of the preset temperature range, the final threshold value of the shutdown temperature is △T_thre_off = △T_thre_off0-△T_thre_off_xz1.

[0107] The second case: when the first temperature difference corresponding to the indoor unit with the maximum rated energy demand is greater than the upper limit of the preset temperature interval and less than the preset temperature threshold, the second preset temperature is used as the temperature correction temperature, wherein the second preset temperature is greater than the first preset temperature; when the first temperature difference △T_max is greater than the upper limit of the preset temperature interval and less than the preset temperature threshold, the final temperature shutdown temperature threshold is △T_thre_off=△T_thre_off0-△T_thre_off_xz2.

[0108] Case 3: When the first temperature difference corresponding to the indoor unit with the maximum rated energy demand is greater than the preset temperature threshold, a third preset temperature is used as the temperature correction temperature, where the third preset temperature is greater than the second preset temperature. When the first temperature difference ΔT_max is greater than the preset temperature threshold, the final temperature threshold for the shutdown temperature is ΔT_thre_off = ΔT_thre_off0 - ΔT_thre_off_xz3.

[0109] Based on the control methods of the multi-split air conditioner in each of the above-mentioned embodiments, overall embodiments of the control methods of the multi-split air conditioner of the present application are respectively proposed below.

[0110] like Figure 7 As shown, Figure 7 This is an overall flow chart of a control method for a multi-split air conditioner provided by an embodiment of the present application, which specifically includes the following aspects:

[0111] 1. Detect the temperature difference between the indoor temperature and the set temperature of each indoor unit from the time it is turned on to a certain moment. Based on the temperature difference between the indoor temperature and the set temperature of all currently turned on indoor units, as well as the capacity segment of the turned-on indoor units, determine whether to enter the load uneven correction mode.

[0112] Condition 1 is: among the indoor units currently running, the difference in rated energy demand between the indoor unit with the maximum capacity demand and the indoor unit with the minimum capacity demand exceeds a preset energy demand difference, for example, 40%.

[0113] In addition, condition 2 is: calculate ΔT = T1 - Ts for each indoor unit, where T1 is the indoor temperature, Ts is the set temperature, and ΔT is the temperature difference between the indoor temperature and the set temperature. The cumulative operating time of each indoor unit from the start of operation to the current moment when ΔT < 0 is counted. For the i-th indoor unit, the cumulative operating time when ΔT < 0 is recorded as Dawen_Time_i. If Dawen_Time_i of all indoor units is greater than time threshold 1 (i.e., the preset operating time mentioned above), condition 2 is satisfied. The purpose of condition 2 is to determine whether all currently operating indoor units have experienced a period of reaching the temperature during operation, that is, the rapid cooling requirement period for all indoor units has been completed.

[0114] When the above two conditions are met at the same time, go to the next step of control. In the condition that the cooling demand period of all indoor units has been met, it can be regarded as entering the stable operation period. At this time, the entire multi-split system adjusts the indoor coil target temperature (target T2) of the indoor unit of the system by using the load deviation of the most unfavorable load indoor unit. Therefore, in the following stable period, the indoor temperature of the room with small load demand fluctuates, and even reaches the temperature stop. The subsequent steps are to further solve this problem.

[0115] II. According to the rated demand size of the indoor unit, correct the target superheat of the corresponding indoor unit, which is used to adjust the electronic expansion valve of the indoor unit with small load.

[0116] For each indoor unit, the control scheme uses the target superheat to adjust the opening degree of the electronic expansion valve of each indoor unit. Assuming that the reference superheat of the indoor unit with the maximum rated capacity demand at this moment is SH_tar_0, for the indoor unit whose capacity demand is more than 40% different from the indoor unit with the maximum rated capacity demand (for example, the maximum rated capacity demand indoor unit currently running is 7.2kW, and for the currently running indoor unit, the capacity demand of the indoor unit is less than or equal to 4.32kW), the target superheat of the corresponding indoor unit is increased by a preset increment superheat ΔSH, and the target superheat SH_tar_i of the corresponding indoor unit is adjusted to SH_tar_0+ΔSH. The purpose of this step is to try to reduce the opening degree of the electronic expansion valve of the indoor unit with small load demand, so as to reduce the refrigerant flow.

[0117] III. According to the temperature difference between the indoor temperature of the opened multi-indoor unit and the set temperature, adjust the calculation weight of the indoor coil target temperature of the system by different indoor loads, and determine the calculation method of the indoor coil target temperature.

[0118] In the traditional normal control, the control method is to adjust the indoor coil target temperature of the entire multi-split system according to the temperature difference between the indoor temperature of the indoor unit with the largest load demand and the set temperature. This control method will cause the indoor temperature of different indoor units to deviate too much from the actual demand or cause frequent temperature reaching, which will cause the indoor temperature to fluctuate greatly. The second step can improve the distribution of refrigerant flow to a certain extent through the opening degree of the expansion valve, but the entire output of the system is determined by the system target T2. Specifically, the frequency is adjusted according to the difference between the actual T2 of the system and the target T2.

[0119] In this step, the first temperature difference between the indoor temperature of the maximum rated demand indoor unit and the set temperature is calculated as △T_max = T1-Ts. Based on the range of this value, the calculation method of the current system target T2 is determined. In general, the calculation formula of target T2 is as follows, where C is a preset correction coefficient, C is greater than 0, and is placed in the parameter table. The specific value can be determined according to the actual situation. In addition, according to the different ranges of △T_max, the value of the target correction temperature △T_load is determined, as shown in the following example: Figure 8 Partition shown, in addition, the calculation formula of T2_target(t) is as follows:

[0120] T2_target(t)=T2_target(t-1)-C*△T_load

[0121] When ΔT_max is in interval 1, the actual load demand of the maximum rated indoor unit is low. In this case, the target T2 for the indoor unit with the minimum load demand is modified: ΔT_i = T1_i - Ts_i for all operating indoor units. ΔT_load is the minimum value of all ΔT_i. In this case, T2_target(t) = T2_target(t-1) - C*min(ΔT_i).

[0122] When ΔT_max is in interval 0 (ie, the aforementioned preset temperature interval), it can be considered as a load balancing zone and no adjustment is required to the target T2. In the calculation formula of the target T2, the correction coefficient C=0.

[0123] When ΔT_max is in interval 2 (the upper limit of interval 2 is the preset temperature threshold mentioned above), this can be considered a low-load demand zone. The target T2 is corrected by taking into account the actual loads of both high-load and low-load demand indoor units: ΔT_i = T1_i - Ts_i for all operating indoor units, ΔT_load = K1*(min(ΔT_i)) + K2*(max(ΔT_i)), where K1+K2=1. The specific weights of K1 and K2 are determined experimentally. At this time, T2_target(t) = T2_target(t-1) - C*K1*((min(ΔT_i)) + K2*(max(ΔT_i))). K1 is the first weight coefficient mentioned above, and K2 is the second weight coefficient mentioned above.

[0124] When ΔT_max is in interval 3, it can be considered a high-load demand zone. Using the maximum load demand internal unit, the corrected target T2 is calculated. ΔT_i = T1_i - Ts_i for all operating internal units. ΔT_load takes the maximum ΔT_i value of all internal units. At this point, T2_target(t) = T2_target(t-1) - C*max(ΔT_i).

[0125] 4. According to the range of the first temperature difference between the indoor temperature of the indoor unit with the maximum rated demand and the set temperature, ΔT_max=T1-Ts, the temperature-reaching shutdown conditions of the remaining indoor units (with a difference of 40% in rated energy demand) are adjusted.

[0126] In traditional normal control, the original temperature-reaching shutdown condition is that when ΔT < ΔT_thre_off0 (ΔT_thre_off0 < 0), the indoor unit is considered to have no load demand and shuts down its electronic expansion valve and indoor fan. However, in the embodiment of this application, the correction value of ΔT_thre_off is determined based on the range of ΔT_max. In the following parameters, ΔT_thre_off_xz1 < ΔT_thre_off_xz2 < ΔT_thre_off_xz3, where ΔT_thre_off_xz1, ΔT_thre_off_xz2, and ΔT_thre_off_xz3 represent the aforementioned temperature-reaching corrections.

[0127] When ΔT_max is between interval 1 and interval 0, the final threshold value for reaching the shutdown temperature is ΔT_thre_off=ΔT_thre_off0−ΔT_thre_off_xz1.

[0128] When ΔT_max is in interval 2, the final threshold value for reaching the shutdown temperature is ΔT_thre_off=ΔT_thre_off0−ΔT_thre_off_xz2.

[0129] When ΔT_max is in interval 3, the final threshold value for reaching the shutdown temperature is ΔT_thre_off=ΔT_thre_off0−ΔT_thre_off_xz3.

[0130] 5. Control the system compressor frequency based on the difference between the system target T2 and the system actual T2 determined in the above manner; and determine the start and stop of each indoor unit based on the above temperature reaching judgment conditions.

[0131] Obtain the real-time actual T2 value of each indoor unit and perform a weighted average of the system's actual T2 values ​​according to the rated capacities of the different indoor units to obtain the current system's actual average T2 value (such as the weighted average temperature of the indoor unit coils described above). For example, if there are currently n indoor units in demand, with nominal capacities of n1, n2, n3, ..., nx kW, and corresponding T2 temperatures of T21, T22, T23, ..., T2x°C, then the weighted average temperature of the indoor unit coils, T_2mean, is calculated as follows: (n1*T21+n2*T22+n3*T23+...+nx*T2x) / (n1+n2+n3+...+nx).

[0132] The frequency increase or decrease of the compressor is determined based on the difference between T_2mean and T_2target. When the actual T2 is less than the target T2, the compressor operates at a reduced frequency. When the actual T2 is greater than the target T2, the compressor operates at a increased frequency.

[0133] Based on the control method of the multi-split air conditioner in each of the above-mentioned embodiments, the embodiment of the present application determines whether to enter the load unevenness correction control by judging the rated energy demand and real-time load status of the currently running indoor unit. In the load unevenness correction control, by changing the calculation method of the system target T2, the correction method of the indoor unit target overheat, and the temperature reaching condition of the indoor unit with small load demand, the system output and the differentiated demands of different indoor units are balanced to the greatest extent. On the basis of ensuring the indoor unit with large load demand, the indoor unit with small load demand can also extend the time to maintain stable output, reduce the temperature fluctuation caused by the start and stop of the indoor unit, and increase the thermal comfort of the user.

[0134] Based on the control methods of the multi-split air conditioner in each of the above-mentioned embodiments, various embodiments of the controller, multi-split air conditioner, computer-readable storage medium and computer program product of the present application are respectively proposed below.

[0135] like Figure 9 As shown, Figure 9 1 is a schematic diagram of a controller for executing a control method for a multi-split air conditioner provided by an embodiment of the present application. The controller 100 implemented in the present application includes: a processor 110, a memory 120, and a computer program stored in the memory 120 and executable on the processor 110, wherein: Figure 9 In the figure, a processor 110 and a memory 120 are taken as an example.

[0136] The processor 110 and the memory 120 may be connected via a bus or other means. Figure 9 The bus connection is taken as an example.

[0137] The memory 120 is a non-transitory computer-readable storage medium that can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 120 may include a high-speed random access memory and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 120 optionally includes a memory 120 remotely located relative to the processor 110, and these remote memories 120 can be connected to the controller 100 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0138] Those skilled in the art will understand that Figure 9The device structure shown in the figure does not constitute a limitation on the controller 100, and the controller 100 may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0139] exist Figure 9 In the illustrated controller 100, the processor 110 can be used to call a control program stored in the memory 120 to implement the aforementioned method for controlling a multi-split air conditioner. Specifically, the non-transient software program and instructions required to implement the method for controlling a multi-split air conditioner according to the aforementioned embodiment are stored in the memory 120. When executed by the processor 110, the method for controlling a multi-split air conditioner according to the aforementioned embodiment is performed.

[0140] It is worth noting that since the controller 100 of the embodiment of the present application can execute the control method of the multi-split air conditioner of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the controller 100 of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of the multi-split air conditioner of any of the above-mentioned embodiments.

[0141] In addition, an embodiment of the present application further provides a multi-split air conditioner, which includes the controller of the above embodiment.

[0142] It is worth noting that since the multi-split air conditioner of the embodiment of the present application includes the controller of the above-mentioned embodiment, and the controller of the above-mentioned embodiment can execute the control method of the multi-split air conditioner of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the multi-split air conditioner of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of the multi-split air conditioner of any of the above-mentioned embodiments.

[0143] In addition, an embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to execute the control method of the multi-split air conditioner described above. Figures 1 to 7 The method steps in .

[0144] It is worth noting that since the computer-readable storage medium of the embodiment of the present application can execute the control method of the multi-split air conditioner of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the computer-readable storage medium of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of the multi-split air conditioner of any of the above-mentioned embodiments.

[0145] In addition, one embodiment of the present application further provides a computer program product, including a computer program or computer instructions, the computer program or computer instructions being stored in a computer-readable storage medium, the processor of a computer device reading the computer program or computer instructions from the computer-readable storage medium, and the processor executing the computer program or computer instructions, so that the computer device executes the above-described method for controlling a multi-split air conditioner. For example, the above-described Figures 1 to 7 The method steps in .

[0146] It is worth noting that since the computer program product of the embodiment of the present application can execute the control method of the multi-split air conditioner of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the computer program product of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of the multi-split air conditioner of any of the above-mentioned embodiments.

[0147] Those skilled in the art will appreciate that all or some of the steps and systems in the method disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include computer storage media (or non-transitory media) and communication media (or temporary media). As known to those skilled in the art, the term computer storage media is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data) and is volatile and non-volatile, removable, and non-removable. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technology, CD-ROM, digital versatile disks (DVD), or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage, or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0148] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0149] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0150] It should also be understood that the various implementation methods provided in the embodiments of the present application can be combined arbitrarily to achieve different technical effects.

[0151] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the art can also make various equivalent modifications or substitutions under the shared conditions that do not violate the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A control method for a multi-split air conditioner, characterized in that: The method comprises: Obtaining the indoor temperature, maximum rated energy demand, and minimum rated energy demand of all indoor units in operation, and determining a temperature difference between the indoor temperature and a set temperature, and an energy demand difference between the maximum rated energy demand and the minimum rated energy demand; When the temperature difference and the energy demand difference meet a preset correction condition, determining a target indoor unit whose difference from the maximum rated energy demand reaches a preset energy demand difference, correcting a target superheat of the target indoor unit, and adjusting the opening of a throttling component corresponding to the target indoor unit according to the target superheat; The target temperature of the indoor coil of the multi-split air conditioner is determined according to the temperature difference of the indoor unit, and the operating frequency of the compressor is adjusted according to the received actual temperature of the indoor coil and the target temperature of the indoor coil.

2. The method according to claim 1, characterized in that The preset correction conditions include: The energy demand difference between the maximum rated energy demand and the minimum rated energy demand is greater than the preset energy demand difference; The accumulated operating time of all the indoor units in which the temperature differences are less than zero is greater than a preset operating time.

3. The method according to claim 1, characterized in that The correcting the target superheat of the target indoor unit includes: Obtaining a reference superheat corresponding to the indoor unit with the maximum rated energy demand; For the target indoor unit, a target superheat degree of the target indoor unit is determined according to the reference superheat degree and a preset incremental superheat degree.

4. The method according to claim 1, wherein The step of determining the target temperature of the indoor coil of the multi-split air conditioner according to the temperature difference of the indoor unit comprises: Determining a first temperature difference corresponding to the indoor unit with the maximum rated energy demand; When the first temperature difference is within a preset temperature range, maintaining the target temperature of the indoor unit coil unchanged; When the first temperature difference is outside the preset temperature range, a target correction temperature is determined according to the first temperature difference and the temperature differences of all the indoor units, and the target temperature of the indoor unit coil is adjusted according to the target correction temperature and a preset correction coefficient.

5. The method according to claim 4, characterized in that The determining of the target correction temperature according to the first temperature difference and the temperature differences of all the indoor units includes one of the following: When the first temperature difference is less than the lower limit of the preset temperature interval, selecting the minimum temperature from the temperature differences of all the indoor units as the target correction temperature; When the first temperature difference is greater than the upper limit of the preset temperature interval and less than a preset temperature threshold, a minimum temperature and a maximum temperature are selected from the temperature differences of all the indoor units, and a target correction temperature is determined based on a first weight coefficient and the minimum temperature and a second weight coefficient and the maximum temperature, wherein the first weight coefficient corresponds to the minimum temperature and the second weight coefficient corresponds to the maximum temperature; When the first temperature difference is greater than the preset temperature threshold, a maximum temperature is selected from the temperature differences of all the indoor units as a target correction temperature.

6. The method according to claim 1, characterized in that The adjusting the operating frequency of the compressor according to the received actual temperature of the indoor unit coil and the target temperature of the indoor unit coil includes: obtaining the rated capacity of the indoor unit; Taking a weighted average of the rated capacity and the actual temperature of the indoor unit coil to obtain a weighted average temperature of the indoor unit coil; The operating frequency of the compressor is adjusted according to the difference between the weighted average temperature of the indoor unit coil and the target temperature of the indoor unit coil.

7. The method according to claim 6, characterized in that The adjusting the operating frequency of the compressor according to the difference between the weighted average temperature of the indoor unit coil and the target temperature of the indoor unit coil includes one of the following: When the difference between the weighted average temperature of the indoor unit coil and the target temperature of the indoor unit coil is less than zero, reducing the operating frequency of the compressor; When the difference between the weighted average temperature of the indoor unit coil and the target temperature of the indoor unit coil is greater than zero, the operating frequency of the compressor is increased.

8. The method according to claim 1, characterized in that The method further comprises: adjusting the temperature of the target indoor unit according to a first temperature difference corresponding to the indoor unit with the maximum rated energy demand; For the target indoor unit, the on state of the target indoor unit is determined according to the temperature difference and the temperature reaching shutdown temperature.

9. The method according to claim 8, characterized in that The step of adjusting the temperature-reaching shutdown temperature of the target indoor unit according to the first temperature difference corresponding to the indoor unit with the maximum rated energy demand includes: determining a corrected temperature according to a first temperature difference corresponding to the indoor unit with the maximum rated energy requirement; The difference between the preset temperature-reaching shutdown temperature and the temperature-reaching correction temperature is used as the target temperature-reaching shutdown temperature of the target indoor unit.

10. The method according to claim 9, characterized in that The step of determining the corrected temperature according to the first temperature difference corresponding to the indoor unit with the maximum rated energy requirement includes one of the following: When the first temperature difference corresponding to the indoor unit with the maximum rated energy demand is less than the upper limit of the preset temperature range, the first preset temperature is used as the repair temperature positive temperature; When the first temperature difference corresponding to the indoor unit with the maximum rated energy demand is greater than the upper limit of the preset temperature interval and less than the preset temperature threshold, a second preset temperature is used as the temperature correction temperature, wherein the second preset temperature is greater than the first preset temperature; When the first temperature difference corresponding to the indoor unit with the maximum rated energy demand is greater than a preset temperature threshold, a third preset temperature is used as the temperature correction temperature, wherein the third preset temperature is greater than the second preset temperature.

11. A controller, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method for a multi-split air conditioner according to any one of claims 1 to 10 when executing the computer program.

12. A multi-split air conditioner, characterized in that: Comprising the controller of claim 11.

13. A computer-readable storage medium, characterized in that: Computer-executable instructions are stored, and the computer-executable instructions are used to execute the control method of the multi-split air conditioner according to any one of claims 1 to 10.

14. A computer program product comprising a computer program or computer instructions, characterized in that The computer program or the computer instructions are stored in a computer-readable storage medium, the processor of the computer device reads the computer program or the computer instructions from the computer-readable storage medium, and the processor executes the computer program or the computer instructions, so that the computer device executes the control method of the multi-split air conditioner as described in any one of claims 1 to 10.

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