A multi-split air conditioning system and a control method thereof

Abstract

The application provides a multi-connected air conditioning system and a control method thereof, and relates to the technical field of air conditioners. The system comprises an outdoor unit, an indoor unit group comprising multiple parallel indoor units, and a controller of the outdoor unit. The controller is configured to receive mode request signals sent by multiple indoor units simultaneously, determine whether there is a mode conflict according to mutual exclusion relationships between working modes corresponding to the mode request signals, determine an optimal working mode in the current working condition according to an environmental parameter in the case where there is a mode conflict, send a working mode start feedback signal of the optimal working mode to a first type of indoor unit, and send an air supply mode start feedback signal and a mode conflict reminder to a second type of indoor unit. In the application, the optimal working mode is determined according to the environmental parameter, thereby avoiding the mode conflict, improving the working efficiency of the system and the use experience of the user, and improving the energy-saving effect of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to a multi-split air conditioning system and a control method thereof. BACKGROUND

[0002] A multi-split air conditioning system is an air conditioning system that can connect multiple indoor units to one outdoor unit simultaneously. These indoor units can be installed in different rooms or areas, and each indoor unit can be individually controlled for temperature and air speed. Mode conflict in a multi-split air conditioning system refers to a situation where different modes may conflict when multiple indoor units are working simultaneously, causing the system to malfunction or exhibit abnormal behavior.

[0003] In related technologies, a multi-split air conditioning system determines priority according to the order in which modes are entered. The priority of the first entered mode is higher, which can cause the operation of the indoor unit in the later entered mode to fail, resulting in a poor user experience. SUMMARY

[0004] Embodiments of the present application provide a multi-split air conditioning system and a control method thereof, aiming to solve the problem of poor user experience caused by the higher priority of the first entered mode in existing multi-split air conditioning systems, which leads to the failure of the operation of the indoor unit in the later entered mode.

[0005] To solve the above technical problems, the present application is implemented as follows:

[0006] In a first aspect, the embodiments of the present application provide a multi-split air conditioning system, which includes:

[0007] an outdoor unit;

[0008] a plurality of indoor units connected in parallel;

[0009] the outdoor unit includes a controller configured to:

[0010] receive mode request signals sent simultaneously by multiple indoor units, and determine whether there is a mode conflict according to the mutual exclusion relationship between the working modes corresponding to the mode request signals;

[0011] in the case of a mode conflict, determine the best working mode under the current working condition according to environmental parameters;

[0012] send a best working mode start feedback signal to the first type of indoor unit, and send an air supply mode start feedback signal and a mode conflict reminder to the second type of indoor unit.

[0013] The technical scheme provided by the embodiments of the present application brings at least the following beneficial effects: first, by receiving the mode request signals sent by multiple indoor units at the same time, and judging whether there is a mode conflict, if there is, determining the best working mode according to the environmental parameters, thereby avoiding the mode conflict, improving the working efficiency of the system and the use experience of the user. Second, the system determines the best working mode under the current working condition according to the environmental parameters, which can select the most suitable working mode under different environmental conditions, thereby improving the energy saving effect of the system. At the same time, the system can automatically select the working mode according to the environmental parameters, and the user does not need to manually adjust, thereby improving the use convenience of the user. Finally, the indoor unit in mode conflict is sent a conflict reminder to help the user understand the conflict between the indoor units in time and take measures to solve the problem, thereby better managing the indoor environment.

[0014] In some embodiments, the controller is further configured to:

[0015] determine the indoor unit whose working mode corresponding to the mode request signal matches the best working mode as a first type indoor unit;

[0016] determine the indoor unit whose working mode corresponding to the mode request signal does not match the best working mode as a second type indoor unit.

[0017] In some embodiments, the controller is further configured to:

[0018] determine the type of the mode conflict, wherein the type of the mode conflict includes a conflict between a cooling mode and a heating mode, and a conflict between a dehumidification mode and a heating mode;

[0019] in a case where the type of the mode conflict is the conflict between the cooling mode and the heating mode, determine the best working mode under the current working condition according to the outdoor temperature and the indoor return air temperature;

[0020] in a case where the type of the mode conflict is the conflict between the dehumidification mode and the heating mode, determine the best working mode under the current working condition according to the outdoor temperature, the indoor humidity, and the indoor return air temperature.

[0021] In some embodiments, the system further comprises a first temperature sensor and at least one second temperature sensor;

[0022] the controller is further configured to:

[0023] obtain the outdoor temperature through the first temperature sensor, and obtain the indoor return air temperature of each indoor unit through the at least one second temperature sensor;

[0024] in a case where the outdoor temperature is greater than or equal to a preset upper temperature threshold, determine that the best working mode under the current working condition is the cooling mode;

[0025] When the outdoor temperature is less than or equal to the preset temperature lower limit threshold, determining that the optimal working mode under the current working conditions is the heating mode;

[0026] When the outdoor temperature is between the upper temperature threshold and the lower temperature threshold, the optimal operating mode under the current working conditions is determined according to the indoor return air temperature.

[0027] In some embodiments, the system further comprises at least one humidity sensor;

[0028] The controller is also configured to:

[0029] obtaining the indoor humidity of each indoor unit through at least one humidity sensor;

[0030] When the indoor humidity is greater than or equal to a preset humidity threshold, determining that the optimal working mode under the current working conditions is the dehumidification mode;

[0031] When the indoor humidity is lower than a preset humidity threshold and the outdoor temperature is higher than or equal to a preset temperature upper limit threshold, determining that the optimal working mode under the current working conditions is the dehumidification mode;

[0032] When the indoor humidity is less than a preset humidity threshold and the outdoor temperature is less than or equal to a preset temperature lower limit threshold, determining that the optimal operating mode under the current working conditions is the heating mode;

[0033] When the indoor humidity is lower than the preset humidity threshold and the outdoor temperature is between the upper temperature threshold and the lower temperature threshold, the optimal working mode under the current working conditions is determined based on the indoor return air temperature.

[0034] In some embodiments, the controller is further configured to:

[0035] Determine an indoor unit whose indoor return air temperature is greater than or equal to a preset upper temperature threshold as a third type indoor unit;

[0036] Determine an indoor unit whose indoor return air temperature is less than or equal to a preset upper temperature threshold as a fourth type indoor unit;

[0037] Determine the difference between the average indoor return air temperature of the third type indoor unit and the preset upper temperature threshold as the first calculation result, and determine the difference between the average indoor return air temperature of the fourth type indoor unit and the preset lower temperature threshold as the second calculation result;

[0038] When the first calculation result is greater than the second calculation result, the optimal operating mode under the current working condition is determined to be the cooling mode. When the first calculation result is less than the second calculation result, the optimal operating mode under the current working condition is determined to be the heating mode.

[0039] In some embodiments, the controller is further configured to:

[0040] When the first calculation result is equal to the second calculation result, obtaining the number of the third type indoor units and the number of the fourth type indoor units;

[0041] When the number of the third type indoor units is greater than or equal to the number of the fourth type indoor units, determining that the optimal operating mode under the current working condition is the cooling mode;

[0042] When the number of the third type indoor units is less than the number of the fourth type indoor units, it is determined that the optimal operating mode under the current working condition is the heating mode.

[0043] In some embodiments, the controller is further configured to:

[0044] Determine the weight of each indoor unit according to the cooling capacity of each indoor unit;

[0045] Calculate the average indoor return air temperature of the third type indoor units according to the weighted weights of the third type indoor units and the indoor return air temperature;

[0046] The average indoor return air temperature of the fourth type indoor units is calculated according to the weighted weights of the fourth type indoor units and the indoor return air temperature.

[0047] In some embodiments, the controller is further configured to:

[0048] Receive mode request signals sent non-simultaneously by multiple indoor units;

[0049] Determine the working mode corresponding to the mode request signal received first as the optimal working mode;

[0050] Determine whether the operating mode corresponding to the subsequently received mode request signal conflicts with the optimal operating mode;

[0051] In the event of a mode conflict, a step of determining the best operating mode under current working conditions according to environmental parameters is performed.

[0052] In a second aspect, an embodiment of the present invention provides a multi-split air conditioner control method, which is applied to the multi-split air conditioner system described above, and the method includes:

[0053] The outdoor unit controller receives mode request signals sent simultaneously by multiple indoor units and determines whether there is a mode conflict based on the mutually exclusive relationship of the mode request signals;

[0054] In the event of a mode conflict, the outdoor unit controller determines the optimal operating mode under the current working conditions based on environmental parameters;

[0055] The outdoor unit controller sends an optimal working mode start-up feedback signal to the first type indoor unit, and sends an air supply mode start-up feedback signal and a mode conflict reminder to the second type indoor unit.

[0056] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, which stores instructions. When the instructions are executed on any of the above-mentioned devices, the device executes any of the above-mentioned multi-split air conditioning control methods.

[0057] In a fourth aspect, an embodiment of the present application provides a chip comprising: a processor and a memory; the memory is used to store computer execution instructions, the processor is connected to the memory, and when the chip is running, the processor executes the computer execution instructions stored in the memory so that the chip executes any one of the above-mentioned multi-split air conditioning control methods.

[0058] In a fifth aspect, an embodiment of the present application provides a computer program product comprising instructions, which, when run on any of the above-mentioned devices, enables the device to execute any of the above-mentioned multi-split air conditioning control methods.

[0059] The beneficial effects of the second to fifth aspects above can refer to the content of any implementation of the first aspect, and will not be repeated here. Based on the implementation provided by the above aspects, this application can also be further combined to provide more implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0061] Figure 1 2 is a schematic structural diagram of a multi-split air conditioning system according to an embodiment of the present invention;

[0062] Figure 2 This is a flowchart of a multi-split air conditioner control method according to an embodiment of the present invention;

[0063] Figure 3 Schematic diagram of mutually exclusive relationship among indoor unit working modes in an embodiment of the present invention;

[0064] Figure 4 This is a flowchart of another multi-split air conditioner control method according to an embodiment of the present invention;

[0065] Figure 5 This is a flowchart of another multi-split air conditioner control method according to an embodiment of the present invention;

[0066] Figure 6 is a structural diagram of another multi-split air conditioning system according to an embodiment of the present invention;

[0067] Figure 7 This is a flowchart of another multi-split air conditioner control method according to an embodiment of the present invention;

[0068] Figure 8 This is a flowchart of another multi-split air conditioner control method according to an embodiment of the present invention;

[0069] Figure 9 This is a flowchart of another multi-split air conditioner control method according to an embodiment of the present invention;

[0070] Figure 10 This is a logic flow chart of mode conflict judgment in an embodiment of the present invention;

[0071] Figure 11 is another logic flow chart of mode conflict judgment in an embodiment of the present invention;

[0072] Figure 12 is another logic flow chart of mode conflict judgment in an embodiment of the present invention;

[0073] Figure 13 This is a flowchart of another multi-split air conditioner control method according to an embodiment of the present invention.

[0074] Reference numerals: 100, multi-split air-conditioning system; 11, outdoor unit; 12, indoor unit; 13, air-conditioning remote control. DETAILED DESCRIPTION

[0075] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0076] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0077] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connect" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "connected" used in this application have the meaning of conducting electricity. The specific meanings need to be understood in the context.

[0078] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0079] As mentioned in the background technology, in a multi-split air-conditioning system, different indoor units may work at the same time, and different modes may be set between the indoor units, such as cooling, heating, air supply, etc. When multiple indoor units work at the same time, the outdoor unit needs to allocate the refrigerant flow and cold and heat source capacity according to different needs to meet the working needs of each indoor unit. When making mode judgments, existing multi-split air-conditioning systems usually judge the priority according to the order in which the modes enter the system. Specifically, the mode set by the indoor unit that enters the system first has a higher priority, and the mode set by the indoor unit that enters the system later has a lower priority. If the mode set by the indoor unit that enters the system later conflicts with the mode of the indoor unit that enters the system first, the system will respond to the mode that enters first, and will not respond to the mode that enters later.

[0080] For example, if one indoor unit enters the system first and is set to heating mode, and another indoor unit enters the system later and is set to cooling mode, the system will prioritize the heating mode set by the indoor unit that entered the system first, and will not be able to meet the cooling needs of the indoor unit that entered the system later. This situation may cause the indoor unit that entered the system later to malfunction, or even cause a system failure, and the user will not be aware of the situation.

[0081] To address this problem, the inventor proposed the technical concept of this application: automatically select the optimal working mode under the current working conditions based on the current indoor and outdoor environment and user needs, to avoid operational failures and poor user experience caused by mode conflicts, while also improving the efficiency of the air-conditioning system and reducing energy consumption.

[0082] To facilitate understanding, some basic concepts of terms or technologies involved in the embodiments of the present invention are first briefly introduced and explained.

[0083] Cooling mode: The air conditioning system's compressor draws the low-temperature, low-pressure gaseous refrigerant, which has evaporated from the evaporator, into the compressor chamber, where it is compressed into a high-temperature, high-pressure gaseous refrigerant that then enters the condenser. In the condenser, the high-temperature, high-pressure gaseous refrigerant condenses into a high-temperature, high-pressure liquid refrigerant. After passing through a throttling element, such as a capillary tube, the liquid refrigerant becomes a low-temperature, low-pressure liquid refrigerant that evaporates in the evaporator before returning to the compressor, completing the refrigeration cycle. In cooling mode, the outdoor heat exchanger acts as the condenser, while the indoor heat exchanger acts as the evaporator.

[0084] Dehumidification mode: The heat exchanger of the indoor unit of the air-conditioning system acts as an evaporator to absorb heat. The indoor air will pass through the evaporator and be condensed into water and remain in the air-conditioning. The water vapor is then discharged through the drain pipe of the air-conditioning, thereby achieving the effect of drying the indoor air.

[0085] Heating mode: The air conditioner's heating mode reverses the refrigeration cycle, transferring indoor heat to the outdoors, thereby raising the indoor temperature. The compressor draws in low-temperature, low-pressure refrigerant, compresses it, and heats it. It then discharges the high-temperature, high-pressure refrigerant into the outdoor unit, where it dissipates heat and cools the refrigerant. The refrigerant then enters the indoor unit, where it exchanges heat with the indoor air, transferring the heat. Through this process, the air conditioner's heating mode effectively raises the indoor temperature.

[0086] Air supply mode: This improves indoor air quality and comfort by filtering, cooling, or humidifying the indoor air before distributing it through a fan. The indoor unit draws in indoor air through a fan and filters out airborne pollutants. In air supply mode, the air conditioner does not cool or heat, so it does not affect the indoor temperature. In this way, air supply mode can improve indoor air quality and comfort without requiring temperature adjustment.

[0087] An embodiment of the present application provides a multi-split air-conditioning system, which includes: an outdoor unit; an indoor unit group, including multiple indoor units connected in parallel; the outdoor unit includes a controller, which is configured to: receive mode request signals sent simultaneously by multiple indoor units, and determine whether there is a mode conflict based on the mutually exclusive relationship between the working modes corresponding to the mode request signals; in the event of a mode conflict, determine the best working mode under the current working conditions based on environmental parameters; send an optimal working mode start-up feedback signal to the first type of indoor unit, and send an air supply mode start-up feedback signal and a mode conflict reminder to the second type of indoor unit.

[0088] The embodiments provided in this application are described in detail below with reference to the accompanying drawings.

[0089] Figure 1The following is a schematic diagram of the composition of a multi-split air conditioning system provided as an example in the embodiment of the present application. Figure 1 , introduces the multi-split air-conditioning system provided in the embodiment of the present application.

[0090] The multi-split air conditioning system 100 includes an outdoor unit 11, an indoor unit group 12 and an air conditioning remote controller 13. Each indoor unit in the indoor unit group 12 is connected to the outdoor unit 11 via a refrigerant connecting pipeline.

[0091] The outdoor unit 11 is usually set outdoors and is used for heat exchange in the indoor environment. In addition, in the embodiment shown in the present application, the air conditioner remote controller 13 refers to a device that can generate an operation control signal based on the instruction operation code and the timing signal to instruct the multi-connected air conditioning system to execute the control instruction. Exemplarily, the controller can be a central processing unit (CPU), a general-purpose processor network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD) or any combination thereof. The controller can also be other devices with processing functions, such as circuits, devices or software modules, and the embodiments of the present application do not impose any restrictions on this.

[0092] In addition, the air conditioner remote controller 13 can be used to control the operation of various components inside the multi-split air conditioning system 100, so that each component of the multi-split air conditioning system 100 can operate to achieve various predetermined functions of the multi-split air conditioning system.

[0093] In some embodiments, the outdoor unit 11 includes a controller having a function of communicating with the controller 14 using, for example, infrared or other communication methods.

[0094] The present application provides a multi-split air conditioner control method, such as Figure 2 As shown, the method is applied to the outdoor unit controller, and includes the following steps:

[0095] S101: receiving mode request signals sent simultaneously by multiple indoor units, and determining whether there is a mode conflict based on the mutually exclusive relationship between the operating modes corresponding to the mode request signals.

[0096] Indoor units generally have four operating modes: cooling, heating, airflow, and dehumidification. These four operating modes are mutually exclusive, as shown in the figure below. As can be seen, the airflow mode does not conflict with any other mode, while the heating mode conflicts with both the cooling and dehumidification modes. In a multi-split air conditioning system, each indoor unit can send its own operating mode request signal to the outdoor unit controller, allowing the air conditioning system to appropriately allocate operating modes to each indoor unit based on user needs. However, when multiple indoor units simultaneously send different operating mode request signals, mode conflicts may occur, causing the air conditioning system to malfunction. During each operating cycle, the outdoor unit controller receives mode request signals from each indoor unit in real time and stores them in a buffer. These signals include information such as the indoor unit's operating mode type, set temperature, and fan speed. The buffered mode request signals from the multiple indoor units are then compared one by one to determine their mutual exclusion relationships.

[0097] Different operating modes are mutually exclusive. During implementation, a mutual exclusion table can be established to record the mutual exclusion relationships between the operating modes. This table can be used to determine whether there is a mode conflict. This table can be a matrix, with rows representing the operating modes and columns representing the indoor units. Each element in the diagram represents the mutual exclusion relationship between a specific operating mode and a specific indoor unit, and can be represented by a number 1 or 0. A number 1 indicates that a mutual exclusion relationship exists between the operating mode and the indoor unit, while a number 0 indicates that there is no mutual exclusion relationship between the operating mode and the indoor unit.

[0098] For example, there is a three-unit air conditioning system with three indoor units, namely indoor unit A, indoor unit B, and indoor unit C. There are four working modes in the system, namely cooling mode, heating mode, dehumidification mode, and air supply mode. According to the characteristics and usage conditions of different working modes, the mutually exclusive relationship between indoor units and working modes can be obtained. The mutually exclusive relationship is as follows: Figure 3 As shown:

[0099] In the diagram above, cooling and heating modes between indoor units A and C are mutually exclusive because they both require refrigerant to achieve temperature control, and only one of these modes can be active at a time. Similarly, dehumidification and ventilation modes between indoor units B and C are mutually exclusive because both require air circulation, and only one of these modes can be active at a time.

[0100] S102: In the event of a mode conflict, determining the optimal working mode under the current working conditions according to environmental parameters.

[0101] In the presence of mode conflicts, in order to avoid operation failure and improve user experience, it is necessary to determine the best working mode in the current environment. In this process, the system will monitor the current environmental parameters, including outdoor temperature, indoor return air temperature, indoor humidity, etc., and make a judgment according to the preset judgment rule, so as to select the best working mode. Specifically, the system will evaluate the applicability of various working modes according to the current environmental parameters, and then select an optimal working mode. In the evaluation process, the system will consider multiple factors such as current environmental parameters, user demand, system state, etc., to comprehensively determine the optimal working mode.

[0102] S103: Send the best working mode start signal to the first type indoor unit, and send the air supply mode start signal and conflict reminder to the second type indoor unit.

[0103] The working mode requested by the first type indoor unit has been determined as the best working mode, so it needs to send the best working mode start signal to it to make it run according to the best working mode. As for the second type indoor unit, since its mode request does not match the best working mode, it cannot run according to the requested mode and needs to switch to the air supply mode. Although the air supply mode cannot fully meet the user's needs, it can provide an alternative solution when there is a mode conflict to ensure the comfort of the indoor environment. When there is a mode conflict, the first type indoor unit has started the best working mode, and the second type indoor unit cannot start the required working mode due to conflict with the best working mode. At this time, starting the air supply mode can provide basic air circulation and adjustment to maintain indoor ventilation and moderate temperature, thereby temporarily meeting the user's needs. Although the air supply mode may not provide precise temperature control like the cooling or heating mode, for some users it may be better than not having an air conditioner. At the same time, in order to remind the user of the mode conflict, a conflict reminder needs to be sent to the user through the module display or other means, so that the user can understand the current working state. In this way, the system can ensure stable operation and user comfort experience when there is a mode conflict by selecting the best working mode and switching to the air supply mode.

[0104] Through the above implementation, the working mode conflict between indoor units can be effectively avoided, and the overall efficiency and stability of the air conditioning system are improved. Determining the best working mode according to environmental parameters can more intelligently adjust the working mode of the air conditioning system, saving energy and reducing consumption. Dividing indoor units into first type and second type and taking different measures for different types of indoor units can more finely manage the running state of the air conditioning system. Sending a conflict reminder can promptly inform the user of the mode conflict, improving the safety of the system and the user experience.

[0105] In some embodiments, the controller of the outdoor unit is further configured to: determine the indoor unit whose mode request signal matches the optimal operating mode as a first type indoor unit, and determine the indoor unit that does not match as a second type indoor unit.

[0106] In a multi-split air conditioning system, different indoor units may send different operating mode request signals. These request signals may be mutually exclusive, leading to mode conflicts. To address this issue, it's necessary to find the optimal operating mode so that all indoor units can operate normally without conflicts. Therefore, the system needs to match the mode request signals with the optimal operating mode to determine which indoor units should be set to the first type and which should be set to the second type.

[0107] Specifically, the system can first calculate the optimal operating mode based on current environmental conditions and user needs. Then, when the indoor unit sends a mode request signal, the system matches this signal with the optimal operating mode. If the request signal sent by an indoor unit matches the optimal operating mode, the indoor unit is determined to be of the first type. If the request signal sent by an indoor unit does not match the optimal operating mode, the indoor unit is determined to be of the second type.

[0108] Categorizing indoor units into Type 1 and Type 2 better meets their varying needs. Type 1 units are prioritized because their request signals match the optimal operating mode, ensuring proper system operation. Type 2 units, on the other hand, need to be configured after Type 1 units to avoid mode conflicts. This allows for more flexible processing of indoor unit requests, improving system efficiency and stability.

[0109] It should be noted that the classification of indoor units into Type 1 and Type 2 is not static; their types may change during different operating cycles. Therefore, the system needs to continuously monitor and analyze to dynamically adjust the type of indoor units to better adapt to different operating conditions and user needs.

[0110] In some embodiments, as Figure 4 As shown, S102 specifically includes:

[0111] S1021: Determine the type of mode conflict, where the type of mode conflict includes a conflict between a cooling mode and a heating mode, and a conflict between a dehumidification mode and a heating mode.

[0112] Determining the type of mode conflict means that the control needs to determine whether the modes corresponding to different indoor unit requests conflict, so that appropriate measures can be taken to resolve the problem if a mode conflict exists. In this embodiment, the types of mode conflict include cooling mode conflict and heating mode conflict, and dehumidification mode conflict and heating mode conflict. Specifically, a mode conflict occurs if an indoor unit requests both cooling and heating, or both dehumidification and heating, at the same time.

[0113] S1022: When the mode conflict type is a conflict between the cooling mode and the heating mode, determine the optimal working mode under the current working conditions according to the outdoor temperature and the indoor return air temperature.

[0114] When the controller determines that the current mode conflict is a conflict between the cooling mode and the heating mode, that is, some rooms have heating requirements and some rooms have cooling requirements, it is necessary to determine which working mode is the best working mode under the current actual situation to meet the needs of most users and energy-saving needs.

[0115] As an example, the user in room A triggers the heating mode request signal due to an accidental touch, and at the same time, the user in room B triggers the cooling mode request signal, and the mode request signals of rooms A and B are received by the controller of the outdoor unit at the same time. In order to eliminate the false triggering in room A, the controller of the outdoor unit needs to determine the best working mode under the current working conditions based on the outdoor temperature and the indoor return air temperature, that is, to filter out the cooling mode request signal of room B.

[0116] S1023: When the mode conflict type is a conflict between the dehumidification mode and the heating mode, determine the optimal working mode under the current working conditions according to the outdoor temperature, the indoor humidity, and the indoor return air temperature.

[0117] Similarly, when the controller determines that the current mode conflict is a conflict between the dehumidification mode and the heating mode, that is, some rooms have heating requirements and some rooms have dehumidification requirements, it is necessary to determine which working mode is the best working mode under the current actual situation to meet the needs of most users and energy-saving needs.

[0118] As an example, the user in room C triggers the dehumidification mode request signal due to an accidental touch, and at the same time, the user in room D triggers the cooling mode request signal, and the mode request signals of rooms C and D are received by the controller of the outdoor unit at the same time. In order to eliminate the false triggering in room C, the controller of the outdoor unit needs to determine the best working mode under the current working conditions based on the outdoor temperature, indoor humidity and indoor return air temperature, that is, to filter out the cooling mode request signal of room D.

[0119] In some embodiments, asFigure 5 As shown, S1022 specifically includes:

[0120] S10221: In the case where the outdoor temperature is greater than or equal to the preset upper temperature threshold, the optimal working mode under the current working condition is determined to be the cooling mode.

[0121] The change of outdoor temperature is one of the main factors affecting the adjustment of working mode of air conditioning system. Therefore, by setting the preset upper temperature threshold and lower temperature threshold, the system can determine the current environmental condition according to the outdoor temperature, so as to select the optimal working mode. In the case where the outdoor temperature is greater than or equal to the preset upper temperature threshold, the system will select the cooling mode as the optimal working mode. This is because the outdoor temperature is high, and the cooling mode can lower the indoor temperature faster and provide a more comfortable environment. Therefore, the cooling mode is more in line with the actual use demand under the current scenario, so it is determined as the optimal working mode under the current working condition.

[0122] As an example, the logical judgment process is shown in the figure. First, the outdoor unit receives the cooling mode request signal sent by the a indoor unit in room A and the heating mode request signal sent by the b indoor unit in room B at the same time. The outdoor unit collects the outdoor temperature Ta. When the preset upper temperature threshold is 22℃, if the outdoor temperature Ta reaches or is higher than 22℃, the optimal working mode under the current working condition is determined to be the cooling mode. Since the mode request signal sent by the a indoor unit matches the optimal working mode, the a indoor unit is determined as the first type indoor unit. Since the mode request signal sent by the b indoor unit does not match the optimal working mode, the b indoor unit is determined as the second type indoor unit. Then the outdoor unit works according to the parameters of the cooling mode, sends the cooling mode start feedback signal to the a indoor unit, and sends the air supply mode start feedback signal and mode conflict reminder to the b indoor unit.

[0123] In some embodiments, the outdoor unit can be a module combination, such as Figure 6 As shown, that is, a plurality of outdoor units are combined into a refrigerant system. In this case, the outdoor temperature Ta collected by the outdoor unit is the average value of Ta1, Ta2, Ta3…TaN collected by N outdoor units, that is, Ta=(Ta1+Ta2+Ta3+…+TaN) / N.

[0124] S10222: In the case where the outdoor temperature is less than or equal to the preset lower temperature threshold, the optimal working mode under the current working condition is determined to be the heating mode.

[0125] When the outdoor temperature is less than or equal to the preset lower temperature threshold, the system selects heating mode as the optimal operating mode. This is because when the outdoor temperature is lower, heating mode can raise the indoor temperature more quickly, providing a more comfortable environment. Therefore, heating mode better meets the actual usage needs in the current scenario and is therefore determined to be the optimal operating mode under the current operating conditions.

[0126] As an example, the logical judgment process is shown in the figure. First, the outdoor unit receives a cooling mode request signal from indoor unit a in room A and a heating mode request signal from indoor unit b in room B. The outdoor unit collects the outdoor temperature Ta. When the preset lower temperature threshold is 18°C, if the outdoor temperature Ta reaches or falls below 18°C, it determines that the optimal operating mode under the current operating conditions is heating mode. Because the mode request signal sent by indoor unit b matches the optimal operating mode, indoor unit b is determined to be a first-type indoor unit. Because the mode request signal sent by indoor unit a does not match the optimal operating mode, indoor unit a is determined to be a second-type indoor unit. The outdoor unit then operates according to the parameters of the heating mode and sends a heating mode start feedback signal to indoor unit b and a fan mode start feedback signal to indoor unit a, as well as a mode conflict reminder.

[0127] S10223: When the outdoor temperature is between an upper temperature threshold and a lower temperature threshold, determine the optimal operating mode under the current working conditions according to the indoor return air temperature.

[0128] When the outdoor temperature is between the upper and lower thresholds, the outdoor temperature is not a good indicator of the optimal operating mode. However, the indoor return air temperature Ti reflects the indoor temperature. Since the primary purpose of an air conditioning system is to regulate indoor temperature, the optimal operating mode must be selected based on the indoor return air temperature, a significant factor influencing the optimal operating mode. Therefore, when the temperature is between the upper and lower thresholds, selecting the optimal operating mode based on the indoor return air temperature allows for more accurate indoor temperature regulation, improving both the efficiency and comfort of the air conditioning system.

[0129] In some embodiments, as Figure 7 As shown, S1023 specifically includes:

[0130] S10231: When the indoor humidity is greater than or equal to a preset humidity threshold, determine that the optimal working mode under the current working conditions is the dehumidification mode.

[0131] When the heating mode and the dehumidification mode conflict, since high humidity can bring people discomfort and even cause health problems, the request for dehumidifying the room needs to be given priority, that is, the indoor humidity of each room in the multi-split system is first judged, and as long as the indoor humidity is greater than or equal to the preset humidity threshold, it is determined that the best working mode under the current working condition is the dehumidification mode.

[0132] As an example, the logical judgment process is shown in the figure, first, the outdoor unit receives the dehumidification mode request signal sent by the c indoor unit in the C room and the heating mode request signal sent by the d indoor unit in the D room at the same time. Then, the ambient humidity THMC in the C room and the ambient humidity THMD in the D room are obtained,

[0133] When the preset humidity threshold is 80%, if THMC reaches or is higher than 80%, it is determined that the best working mode under the current working condition is the dehumidification mode, since the mode request signal sent by the c indoor unit matches the best working mode, the c indoor unit is determined as the first type indoor unit, and since the mode request signal sent by the d indoor unit does not match the best working mode, the d indoor unit is determined as the second type indoor unit. Then the outdoor unit works according to the parameters of the dehumidification mode, and sends the dehumidification mode start feedback signal to the c indoor unit, and sends the air supply mode start feedback signal and the mode conflict reminder to the d indoor unit.

[0134] S10232: In the case that the indoor humidity is less than the preset humidity threshold and the outdoor temperature is greater than or equal to the preset upper temperature threshold, it is determined that the best working mode under the current working condition is the dehumidification mode.

[0135] When the heating mode and the dehumidification mode conflict, but the indoor humidity is less than the preset humidity threshold, that is, the humidity of the current rooms does not affect the human body, so only the temperature needs to be considered as a factor, and the judgment logic is to give priority to the influence of the outdoor temperature. In this case, the indoor air is relatively dry, and the outdoor temperature is relatively high, which is easy to cause the indoor temperature to be too high and the humidity to be too low. Using the cooling mode in this case may make the indoor temperature lower, but it will further reduce the indoor humidity, which will make people feel uncomfortable. Selecting the dehumidification mode can make the indoor air more comfortable by reducing the indoor humidity. Therefore, the dehumidification mode is more in line with the actual use demand under the current scene, so it is determined as the best working mode under the current working condition.

[0136] S10233: In the case that the indoor humidity is less than the preset humidity threshold and the outdoor temperature is less than or equal to the preset lower temperature threshold, it is determined that the best working mode under the current working condition is the heating mode;

[0137] S10234: When the indoor humidity is lower than a preset humidity threshold and the outdoor temperature is between an upper temperature threshold and a lower temperature threshold, determine the optimal working mode under the current working conditions based on the indoor return air temperature.

[0138] In some embodiments, as Figure 8 As shown, S10223 specifically includes:

[0139] S102231: Determine an indoor unit whose indoor return air temperature is greater than or equal to a preset upper temperature threshold as a third type indoor unit, and determine an indoor unit whose indoor return air temperature is less than or equal to the preset upper temperature threshold as a fourth type indoor unit.

[0140] If the outdoor temperature is between the upper and lower temperature thresholds, it indicates a temperature that's neither too hot nor too cold. Therefore, the indoor return air temperature sensor Ti is used to assist in determining the temperature. This process filters out valid data and classifies indoor units with an indoor return air temperature greater than or equal to the preset upper temperature threshold and requesting cooling mode as type three. Indoor units with an indoor return air temperature less than or equal to the preset lower temperature threshold and requesting heating mode as type four.

[0141] It should be noted that the same indoor unit can be either the first type or the third type because the first and third types are judgment results at different stages. Similarly, the second and fourth types are also the same.

[0142] As an example, the preset upper temperature threshold is 22°C and the preset lower temperature threshold is 18°C. The following is the request information and indoor return air temperature of each room:

[0143] Room A: The indoor unit request mode is cooling, and the indoor return air temperature is 25°C.

[0144] Room B: The request mode of indoor unit b is cooling, and the indoor return air temperature is 24°C.

[0145] Room C: The request mode of indoor unit c is heating, and the indoor return air temperature is 17℃.

[0146] Room D: The indoor unit request mode is heating, and the indoor return air temperature is 16°C.

[0147] According to the above conditions, the following conclusion can be drawn: indoor units a and b are determined to be the third type of indoor units, and indoor units c and d are determined to be the fourth type of indoor units.

[0148] S102232: The difference between the indoor return air temperature average value of the third type indoor unit and the preset temperature upper threshold is determined as the first calculation result, and the difference between the indoor return air temperature average value of the fourth type indoor unit and the preset temperature lower threshold is determined as the second calculation result.

[0149] It should be noted that the third type of indoor unit and the fourth type of indoor unit are at least one, so when there are multiple third type of indoor units and fourth type of indoor units, the indoor return air temperature average value of the third type of indoor unit and the indoor return air temperature average value of the fourth type of indoor unit need to be calculated, and the absolute value of the difference between the indoor return air temperature average value of the third type of indoor unit and the preset temperature upper threshold is taken as the first calculation result, and the absolute value of the difference between the indoor return air temperature average value of the fourth type of indoor unit and the preset temperature lower threshold is taken as the second calculation result.

[0150] As an example, continue to describe the above embodiment, the third type of indoor unit includes a and b, the indoor return air temperature average value of the third type of indoor unit is 24.5℃, the indoor return air temperature average value of the fourth type of indoor unit is 14.5℃, the first calculation result is 23.5℃-22℃=2.5℃, and the second calculation result is |16.5℃-18℃|=1.5℃.

[0151] S102233: In the case that the first calculation result is greater than the second calculation result, the best working mode under the current working condition is determined as the cooling mode, and in the case that the first calculation result is less than the second calculation result, the best working mode under the current working condition is determined as the heating mode.

[0152] When the first calculation result is greater than the second calculation result, it means that the gap between the average indoor return air temperature of the third type of indoor unit and the preset temperature upper threshold is greater than the gap between the average indoor return air temperature of the fourth type of indoor unit and the preset temperature lower threshold, at this time the optimal working mode is the cooling mode, so as to adjust the indoor temperature to lower; on the contrary, when the first calculation result is less than the second calculation result, it means that the gap between the average indoor return air temperature of the fourth type of indoor unit and the preset temperature lower threshold is greater than the gap between the average indoor return air temperature of the third type of indoor unit and the preset temperature upper threshold, at this time the optimal working mode is the heating mode, so as to adjust the indoor temperature to rise. Therefore, the room with larger difference needs to reach the comfortable temperature faster, so the requested working mode of the room should be selected preferentially.

[0153] In some embodiments, when the first calculation result is equal to the second calculation result, any working mode can be adopted. However, in order to make the judgment result more accurate, when the first calculation result is equal to the second calculation result, further judgment can be made based on the number of third-type indoor units and fourth-type indoor units, that is, the working mode corresponding to the side with larger number is determined as the optimal working mode.

[0154] In some embodiments, when the number of the third type indoor unit and the fourth type indoor unit is equal, the average indoor return air temperature can be calculated based on the cooling capacity of the indoor unit, such as Figure 9 As shown, it specifically includes:

[0155] S201: Determine the weight of each indoor unit according to the cooling capacity of each indoor unit;

[0156] S202: Calculating an average indoor return air temperature of the third type indoor units based on the weighted weights of the third type indoor units and the indoor return air temperature;

[0157] S203: Calculate an average indoor return air temperature of the fourth type indoor units according to the weighted weights of the fourth type indoor units and the indoor return air temperature.

[0158] First, the cooling capacity of each indoor unit must be determined. Then, the cooling capacities of each indoor unit are weighted to calculate the weight of each indoor unit. Second, based on the weights of each type III indoor unit and the indoor return air temperature, the average indoor return air temperature of the type III indoor units can be calculated.

[0159] As an example, assuming there are two third-type indoor units, the cooling capacity of indoor unit a is 2kW, and the cooling capacity of indoor unit b is 3kW, the weighted weights of the third-type indoor units can be:

[0160] The weight of indoor unit a is: 2 / (2+3)=0.4.

[0161] The weight of indoor unit b is: 3 / (2+3)=0.6.

[0162] The return air temperatures of indoor units a and b are Tia = 24°C and Tib = 26°C, respectively. Their weights are 0.3 and 0.7, respectively. The average indoor return air temperature of the third type of indoor unit is:

[0163] Ti3_avg=0.4×24+0.6×26=25.4°C.

[0164] Similarly, there are three Type 4 indoor units, with indoor return air temperatures of Tic = 14°C, Tid = 15°C, and Tie = 16°C. Their weights are 0.2, 0.3, and 0.5, respectively. The average indoor return air temperature of the Type 4 indoor units is:

[0165] Ti4_avg=0.2×18+0.3×19+0.5×20=15.3°C.

[0166] In some embodiments, the present application will be combined with the attached Figure 10 This section describes the logic for determining when multiple indoor units are powered on simultaneously and a cooling / heating mode conflict occurs. First, indoor units A and B simultaneously send cooling and heating mode requests to the outdoor unit. After receiving these requests, the outdoor unit determines that a mode conflict has occurred. The outdoor unit then uses a sensor to obtain the outdoor temperature and determines the optimal operating mode based on the specific outdoor temperature range. For example, when the outdoor temperature is less than or equal to 18°C, the optimal operating mode is heating. Therefore, indoor unit A activates air supply mode, and indoor unit B activates heating mode. When the outdoor temperature is greater than or equal to 22°C, the optimal operating mode is cooling mode. Therefore, indoor unit A activates cooling mode, and indoor unit B activates air supply mode.

[0167] In some embodiments, the present application will be combined with the attached Figure 11 The logic for determining the optimal operating mode when the outdoor temperature is between 18°C ​​and 22°C is described below. First, the indoor return air temperatures TIA and TIB collected by indoor units A and B are obtained. Based on TIA and TIB, a first calculation result a and a second calculation result b are calculated. The optimal operating mode is determined based on the comparison between the first calculation result a and the second calculation result b. Specifically, when the first calculation result a is less than the second calculation result b, the optimal operating mode is heating mode. Therefore, indoor unit A activates air supply mode, and indoor unit B activates heating mode. Specifically, when the first calculation result a is greater than or equal to the second calculation result b, the optimal operating mode is cooling mode. Therefore, indoor unit A activates cooling mode, and indoor unit B activates air supply mode.

[0168] In some embodiments, the present application will be combined with the attached Figure 12, the judgment logic when multiple indoor units are turned on at the same time and a dehumidification and heating mode conflict occurs is explained. First, indoor unit A and indoor unit B send a dehumidification mode request and a heating mode request to the outdoor unit at the same time. After receiving the dehumidification mode request and the heating mode request, the outdoor unit determines that a mode conflict occurs. Then, the outdoor unit obtains the indoor humidity THMA and THMB collected by indoor unit A and indoor unit B, and determines whether THMA and THMB are greater than the preset threshold. If THMA and THMB are greater than or equal to the preset threshold, the best working mode is the dehumidification mode. Therefore, indoor unit A starts the dehumidification mode and indoor unit B starts the air supply mode. After the humidity value is reduced to below the threshold, according to Figure 11 The judgment logic shown is used for judgment.

[0169] In some embodiments, multiple indoor units may not be turned on at the same time, so the outdoor unit may not receive the mode request signal at the same time. The processing steps for the mode request signal that is not received at the same time are as follows: Figure 13 As shown, it specifically includes:

[0170] S301: receiving mode request signals sent non-simultaneously by multiple indoor units;

[0171] S302: Determine the operating mode corresponding to the first received mode request signal as the optimal operating mode;

[0172] S303: Determine whether the operating mode corresponding to the subsequently received mode request signal conflicts with the optimal operating mode;

[0173] S304: In the event of a mode conflict, executing a step of determining the best working mode under the current working conditions according to environmental parameters.

[0174] During operation, the air conditioning system continuously receives mode request signals from indoor units and uses these signals to determine the optimal operating mode. When request signals from multiple indoor units are not delivered simultaneously, the air conditioning system must prioritize each request signal to quickly respond to the optimal operating mode. First, when the air conditioning system receives the first mode request signal, it determines the operating mode corresponding to this request signal as the current optimal operating mode. The air conditioning system then operates according to the optimal operating mode. When subsequent mode request signals arrive, the system checks whether the operating modes corresponding to these request signals conflict with the current optimal operating mode. If a conflict exists, the system re-determines the optimal operating mode for the current operating conditions based on environmental parameters.

[0175] As an example, suppose the air conditioning system first receives a mode request signal from an indoor unit, which corresponds to heating mode. Therefore, the air conditioning system determines heating mode as the current optimal operating mode. However, if a subsequent request signal arrives from an indoor unit requesting cooling mode, there will be a conflict with the current optimal operating mode. In this case, the air conditioning system will re-determine the optimal operating mode based on environmental parameters to ensure stable system operation. This process is similar to the above embodiment and will not be further described.

[0176] In some embodiments, the controller includes a processor, and optionally, further includes a memory and a communication interface connected to the processor. The processor, memory, and communication interface are connected via a bus.

[0177] A processor can be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. A processor can also be any other device with processing functionality, such as a circuit, a device, or a software module. A processor can also include multiple CPUs, and a processor can be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. The processor here can refer to one or more devices, circuits, or processing cores for processing data (such as computer program instructions).

[0178] The memory may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer, and the embodiments of the present application do not impose any restrictions on this. The memory may exist independently or be integrated with the processor. Among them, the memory may contain computer program code. The processor is used to execute the computer program code stored in the memory, thereby realizing a multi-connected air conditioner control method provided in the embodiments of the present application.

[0179] The communication interface can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area network (WLAN), etc.) The communication interface can be a module, circuit, transceiver or any device that can achieve communication.

[0180] The bus may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc.

[0181] An embodiment of the present invention further provides a computer-readable storage medium, which includes computer-executable instructions. When the computer-executable instructions are executed on a computer, the computer executes a multi-split air conditioner control method provided in the above embodiment.

[0182] An embodiment of the present invention also provides a chip, including: a processor and a memory; the memory is used to store computer execution instructions, and the processor is connected to the memory. When the chip is running, the processor executes the computer execution instructions stored in the memory, so that the chip executes a multi-split air conditioner control method provided in the embodiment.

[0183] An embodiment of the present invention also provides a computer program product, which can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can implement a multi-split air conditioner control method provided in the above embodiment.

[0184] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0185] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A multi-split air conditioning system, characterized in that: The system comprises: Outdoor unit; Indoor unit, including multiple indoor units connected in parallel; The outdoor unit includes a controller, which is configured to: Receive mode request signals sent simultaneously by multiple indoor units, and determine whether there is a mode conflict based on the mutually exclusive relationship between the working modes corresponding to the mode request signals; In the event of mode conflict, the optimal working mode under the current working conditions is determined based on environmental parameters; Sending an optimal working mode start feedback signal to the first type of indoor unit, and sending a fan mode start feedback signal and a mode conflict reminder to the second type of indoor unit; Wherein, the controller is further configured to: determining a type of the mode conflict, wherein the type of the mode conflict includes a conflict between a cooling mode and a heating mode, and a conflict between a dehumidification mode and a heating mode; When the mode conflict is a conflict between the cooling mode and the heating mode, determining the optimal operating mode under the current working conditions according to the outdoor temperature and the indoor return air temperature; In the case where the mode conflict type is a conflict between the dehumidification mode and the heating mode, the optimal working mode under the current working conditions is determined according to the outdoor temperature, the indoor humidity and the indoor return air temperature.

2. The multi-split air conditioning system according to claim 1, characterized in that: The controller is further configured to: determining an indoor unit whose operating mode corresponding to the mode request signal matches the optimal operating mode as the first type indoor unit; An indoor unit whose operating mode corresponding to the mode request signal does not match the optimal operating mode is determined as the second type indoor unit.

3. The multi-split air conditioning system according to claim 1 or 2, characterized in that: The system further includes a first temperature sensor and at least one second temperature sensor; The controller is further configured to: obtaining the outdoor temperature through the first temperature sensor and obtaining the indoor return air temperature of each indoor unit through the at least one second temperature sensor; When the outdoor temperature is greater than or equal to a preset temperature upper limit threshold, determining that the optimal working mode under the current working condition is the cooling mode; When the outdoor temperature is less than or equal to a preset temperature lower limit threshold, determining that the optimal working mode under the current working condition is the heating mode; When the outdoor temperature is between the preset temperature upper threshold and the preset temperature lower threshold, the optimal working mode under the current working condition is determined according to the indoor return air temperature.

4. The multi-split air conditioning system according to claim 3, characterized in that: The system further includes at least one humidity sensor; The controller is further configured to: obtaining the indoor humidity of each indoor unit through the at least one humidity sensor; When the indoor humidity is greater than or equal to a preset humidity threshold, determining that the optimal working mode under the current working conditions is a dehumidification mode; When the indoor humidity is lower than a preset humidity threshold and the outdoor temperature is higher than or equal to a preset upper temperature threshold, determining that the optimal working mode under the current working condition is a dehumidification mode; When the indoor humidity is less than a preset humidity threshold and the outdoor temperature is less than or equal to a preset temperature lower limit threshold, determining that the optimal operating mode under the current working condition is a heating mode; When the indoor humidity is lower than a preset humidity threshold and the outdoor temperature is between the preset temperature upper threshold and the preset temperature lower threshold, the optimal working mode under the current working conditions is determined according to the indoor return air temperature.

5. The multi-split air conditioning system according to claim 4, characterized in that: The controller is further configured to: Determining the indoor unit whose indoor return air temperature is greater than or equal to the preset upper temperature threshold as a third type indoor unit; Determining the indoor unit whose indoor return air temperature is less than or equal to the preset upper temperature threshold as a fourth type indoor unit; Determine the difference between the average indoor return air temperature of the third type indoor unit and the preset upper temperature threshold as a first calculation result, and determine the difference between the average indoor return air temperature of the fourth type indoor unit and the preset lower temperature threshold as a second calculation result; When the first calculation result is greater than the second calculation result, the optimal operating mode under the current working condition is determined to be the cooling mode. When the first calculation result is less than the second calculation result, the optimal operating mode under the current working condition is determined to be the heating mode.

6. The multi-split air conditioning system according to claim 5, characterized in that: The controller is further configured to: When the first calculation result is equal to the second calculation result, obtaining the number of the third type indoor units and the number of the fourth type indoor units; When the number of the third type indoor units is greater than or equal to the number of the fourth type indoor units, determining that the optimal operating mode under the current working condition is the cooling mode; When the number of the third type indoor units is less than the number of the fourth type indoor units, it is determined that the optimal operating mode under the current working condition is the heating mode.

7. The multi-split air conditioning system according to claim 5, characterized in that: The controller is further configured to: Determine the weight of each indoor unit according to the cooling capacity of each indoor unit; Calculating an average indoor return air temperature of the third type indoor units according to the weighted weights of the third type indoor units and the indoor return air temperature; The average indoor return air temperature of the fourth type indoor unit is calculated according to the weighted weights of the fourth type indoor units and the indoor return air temperature.

8. The multi-split air conditioning system according to any one of claims 1, 2, 4, 5, and 6, characterized in that: The controller is further configured to: Receive mode request signals sent non-simultaneously by multiple indoor units; Determine the working mode corresponding to the mode request signal received first as the optimal working mode; determining whether an operating mode corresponding to a subsequently received mode request signal conflicts with the optimal operating mode; In the event of a mode conflict, the step of determining the optimal working mode under the current working conditions according to the environmental parameters is performed.

9. A multi-split air conditioner control method, characterized in that: Applied to the multi-split air conditioning system according to any one of claims 1 to 8, the method comprises: The outdoor unit controller receives mode request signals sent simultaneously by multiple indoor units and determines whether there is a mode conflict based on the mutually exclusive relationship of the mode request signals; In the event of a mode conflict, the outdoor unit controller determines the optimal operating mode under the current working conditions based on environmental parameters; The outdoor unit controller sends an optimal working mode start feedback signal to the first type indoor unit, and sends an air supply mode start feedback signal and a mode conflict reminder to the second type indoor unit; When there is a mode conflict, the outdoor unit controller determines the optimal operating mode under the current working conditions according to environmental parameters, including: determining a type of the mode conflict, wherein the type of the mode conflict includes a conflict between a cooling mode and a heating mode, and a conflict between a dehumidification mode and a heating mode; When the mode conflict is a conflict between the cooling mode and the heating mode, determining the optimal operating mode under the current working conditions according to the outdoor temperature and the indoor return air temperature; In the case where the mode conflict type is a conflict between the dehumidification mode and the heating mode, the optimal working mode under the current working conditions is determined according to the outdoor temperature, the indoor humidity and the indoor return air temperature.

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