Method and device for controlling expansion valve of inner unit of multi-split air conditioner

Abstract

The invention relates to the field of air conditioners, and provides a multi-split indoor unit expansion valve control method and device, whether indoor units are lost or not is detected, the lost indoor units are sorted based on indoor unit parameters obtained in advance on the basis that the indoor units are lost, and a sorting result is obtained; according to the sorting result and the preset number, the lost indoor units are divided, and at least two groups are obtained; wherein power supply priorities exist among the groups based on the sorting result; and based on the power supply priority, sequentially selecting each group for power supply, and determining whether to adjust the group based on the voltage detected by each lost indoor unit in the corresponding group so as to control the opening degree of the expansion valve of the lost indoor unit in the corresponding group or the adjusted group. The method solves the problem of abnormal system refrigerant flow caused by the fact that the lost indoor unit cannot control the expansion valve due to forced operation of the lost indoor unit of the system, realizes quick response to the demand change of the system, reasonably controls the opening degree of the expansion valve of the power-off indoor unit, ensures normal operation of the multi-split system, and improves the product quality.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a control method and device for an expansion valve of an indoor unit of a multi-connected air conditioner. Background Art

[0002] In a multi-connected indoor and outdoor unit system, one outdoor unit corresponds to multiple indoor units, and the number of indoor units can reach 128. In actual use, various problems may occur in the indoor units that require after-sales maintenance services, such as blocked filter air ducts, damaged motor fans, water leakage in the water receiving trays, etc. During after-sales maintenance, for safety reasons, the power supply of the corresponding indoor unit needs to be disconnected to ensure that the outdoor unit detects the loss of an indoor unit, reports the fault of the lost indoor unit, and stops the operation of the entire system, affecting the use of other normal indoor units.

[0003] Currently, in order to avoid the impact of single indoor unit maintenance on the use of other normal indoor units, mainly when the outdoor unit determines the loss of an indoor unit, a certain tolerance rate is increased, that is, when the loss of indoor units exceeds a certain number or a certain total capacity of the system, the system alarms and shuts down, otherwise it can continue to operate.

[0004] However, in the above method, when the loss of indoor units does not exceed a certain number or a certain total capacity, forced operation will be carried out. For the powered-off indoor units, since the expansion valve cannot be controlled, the refrigerant flow in the system will be abnormal, easily triggering various problems such as system liquid return, excessive exhaust pressure, and lack of oil, seriously affecting the reliable and stable operation of the system. Summary of the Invention

[0006] The present invention provides a control method and device for an expansion valve of an indoor unit of a multi-connected air conditioner, which are used to solve the defect in the prior art that when the system loses an indoor unit and operates forcibly, the loss of the indoor unit causes abnormal refrigerant flow in the system due to the inability to control the expansion valve. By quickly responding to various demand changes in the system and reasonably controlling the opening degree of the expansion valve of the powered-off indoor unit, the normal operation of the multi-connected air conditioner system is ensured, and the product quality is improved.

[0007] The present invention provides a control method for an expansion valve of an indoor unit of a multi-connected air conditioner, including: detecting whether there is a loss of an indoor unit, and based on the presence of a loss of an indoor unit, sorting the lost indoor units based on the previously obtained indoor unit parameters to obtain a sorting result; dividing the lost indoor units according to the sorting result and a preset number to obtain at least two groups; wherein, there is a power supply priority between the groups based on the sorting result; based on the power supply priority, each group is sequentially selected for power supply, and whether to adjust the group is determined based on the voltages detected by the lost indoor units in the corresponding group, so as to control the opening degree of the expansion valve of the lost indoor units in the corresponding group or the adjusted group.

[0008] It should be noted that by detecting and determining the loss of the indoor unit, the lost indoor units are prioritized, so as to facilitate grouping the lost indoor units according to the sorting result and the preset quantity, initially determining the lost indoor units that can synchronously control the opening degree of the expansion valve, and further determining whether the power supply requirements of the corresponding group can be simultaneously met based on the detected voltages of the lost indoor units in the same group, so as to adjust the number of expansion valves of the lost indoor units controlled simultaneously, thereby reasonably controlling the opening degree of the expansion valves of the lost indoor units, achieving rapid response to various demand changes of the system, ensuring the normal operation of the multi-connected air conditioner system, and improving the product quality.

[0009] According to a multi-connected air conditioner indoor unit expansion valve control method provided by the present invention, based on the power supply priority, each group is sequentially selected for power supply, and whether to adjust the group is determined based on the voltages detected by the lost indoor units in the corresponding group, so as to control the opening degree of the expansion valves of the lost indoor units in the corresponding group or the adjusted group, including: sequentially selecting groups based on the power supply priority; for each selected group, controlling the power supply to the corresponding group and receiving the detected voltages sent by the lost indoor units in the selected group; determining whether each detected voltage is greater than or equal to a preset threshold; if each detected voltage is greater than or equal to the preset threshold, controlling the opening degree of the expansion valves of the lost indoor units in the corresponding group.

[0010] It is worth noting that by sequentially selecting groups for power supply based on the power supply priority, it is possible to avoid the situation where the expansion valve actions of all lost indoor units are carried out simultaneously, resulting in an excessive electrical load and thus unable to accurately control the expansion valve. And by determining whether the detected voltages of all lost motors in the same group are lower than the preset threshold, it is possible to determine whether the power supply requirements of all lost indoor units in the group are met. Thus, when the power supply requirements of all lost indoor units in the group can be met, the opening degree of the expansion valves of the lost indoor units in the corresponding group is controlled, realizing reasonable control of the opening degree of the expansion valves.

[0011] According to a multi-connected air conditioner indoor unit expansion valve control method provided by the present invention, determining whether each detected voltage is greater than or equal to a preset threshold further includes: if there is a detected voltage less than the preset threshold, removing the lost indoor unit with the smallest detected voltage from the corresponding group to obtain an updated group, and sequentially adding the lost indoor unit with the smallest detected voltage to the next group; re-controlling the power supply to the updated group and re-receiving the detected voltages sent by the lost indoor units in the updated group to re-determine whether each received detected voltage is greater than or equal to the preset threshold, until the detected voltages of all lost indoor units in the corresponding group are greater than or equal to the preset threshold, and controlling the opening degree of the expansion valves of the lost indoor units in the corresponding group.

[0012] It should be added that in the case where the power supply requirements of all the missing indoor units in the group cannot be met, by adjusting the number of missing indoor units in the current group and re-supplying power to the adjusted group, and then determining whether the power supply requirements of the adjusted group can be met simultaneously based on the detected voltages of the missing indoor units in the adjusted group, the situation where the electrical load is too large and the voltage is insufficient to accurately control the expansion valve can be avoided, and the reasonable control of the expansion valve opening can be achieved.

[0013] According to a method for controlling an expansion valve of an indoor unit of a multi-connected air conditioner provided by the present invention, for each selected group, controlling the power supply to the corresponding group and receiving the detected voltages sent by each missing indoor unit in the selected group, including: for each selected group, controlling to load a weak power supply onto the communication bus; receiving the detected voltages obtained based on detecting the communication bus sent by each missing indoor unit in the selected group.

[0014] It should be noted that by loading a weak current onto the communication bus, it is convenient for the missing indoor unit to detect the voltage of the communication bus, so as to determine the influence of the length of the communication bus on voltage attenuation, and further facilitate the subsequent determination of whether the communication bus can meet the power consumption requirements of all the missing indoor units in the corresponding group.

[0015] According to a method for controlling an expansion valve of an indoor unit of a multi-connected air conditioner provided by the present invention, controlling the opening of the expansion valve of the missing indoor unit in the corresponding group, including: using the weak current loaded onto the communication bus to supply power to the indoor unit chips of each missing indoor unit in the corresponding group, so as to control the opening of the corresponding expansion valve by using the indoor unit chips.

[0016] It should be noted that by using the communication bus to supply power to the indoor unit chips of the corresponding missing indoor units, it is ensured that only the opening of the expansion valve of the corresponding missing indoor units is controlled, and the activation of other power-consuming devices is avoided, so as to minimize the power consumption to the greatest extent, and thus as many expansion valves of missing indoor units as possible can be controlled simultaneously.

[0017] According to a method for controlling an expansion valve of an indoor unit of a multi-connected air conditioner provided by the present invention, sorting the missing indoor units based on the previously obtained indoor unit parameters to obtain a sorting result, including: sorting the corresponding missing indoor units based on a preset parameter priority and the previously obtained indoor unit parameters to obtain a sorting result; or, according to the previously obtained indoor unit parameters, using a preset weight to obtain the scores of the corresponding missing indoor units; sorting the corresponding missing indoor units from high to low according to the scores to obtain a sorting result.

[0018] It should be noted that by sorting based on a preset parameter priority and the previously obtained indoor unit parameters, sorting the corresponding missing indoor units or performing weighted summation on the previously obtained indoor unit parameters, the sorting of the missing indoor units is achieved, and then it is convenient to subsequently select groups for power supply in sequence based on the power supply priority, and avoid the situation where all the missing indoor units perform expansion valve actions simultaneously, resulting in an excessive electrical load and thus being unable to accurately control the expansion valve.

[0019] A method for controlling an expansion valve of an indoor unit of a multi-connected air conditioner according to the present invention detects whether an indoor unit is lost, including: sending a communication signal to the indoor unit; determining whether information returned by the indoor unit based on the communication signal can be received within a preset time; if the information returned by the indoor unit based on the communication signal is not received within the preset time, it is determined that the corresponding indoor unit is lost.

[0020] It should be noted that by sending a communication signal to the indoor unit, it is convenient to determine whether communication is maintained with the indoor unit, so as to timely determine the lost indoor unit after the indoor unit is powered off, so as to facilitate timely control of the expansion valve opening, and avoid abnormal refrigerant flow in the system due to power-off and the inability of the lost indoor unit to control its own expansion valve, thereby triggering situations such as system liquid return, excessive exhaust, and oil shortage.

[0021] The present invention also provides a control device for an expansion valve of an indoor unit of a multi-connected air conditioner, including: a detection module that detects whether an indoor unit is lost, and based on the presence of a lost indoor unit, sorts the lost indoor units according to the previously obtained indoor unit parameters to obtain a sorting result; a grouping module that divides the lost indoor units according to the sorting result and a preset number to obtain at least two groups; wherein, there is a power supply priority between the groups based on the sorting result; a control module that sequentially selects each group for power supply based on the power supply priority, and determines whether to adjust the group based on the voltages detected by the lost indoor units in the corresponding group, so as to control the expansion valve opening of the lost indoor units in the corresponding group or the adjusted group.

[0022] It should be noted that the detection module detects and determines the loss of the indoor unit to sort the lost indoor units by priority, so that the grouping module can group the lost indoor units according to the sorting result and the preset number to initially determine the lost indoor units that can synchronously control the expansion valve opening, and further, the control module determines whether the power supply requirements of the corresponding group can be simultaneously met based on the detected voltages of the lost indoor units in the same group, so as to adjust the number of expansion valves of the lost indoor units controlled simultaneously, so as to reasonably control the expansion valve opening of the lost indoor units, realizing rapid response to various demand changes of the system, ensuring the normal operation of the multi-connected air conditioner system, and improving product quality.

[0023] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the program, the steps of the method for controlling an expansion valve of an indoor unit of a multi-connected air conditioner as described in any one of the above are implemented.

[0024] The present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method for controlling an expansion valve of an indoor unit of a multi-connected air conditioner as described in any one of the above are implemented. Description of the Drawings

[0025] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic flow chart of the control method for the expansion valve of the indoor unit of a multi-connected air conditioner provided by the present invention; Figure 2 It is a schematic architecture diagram of the control method for the expansion valve of the indoor unit of a multi-connected air conditioner provided by the present invention; Figure 3 It is a schematic structural diagram of the control device for the expansion valve of the indoor unit of a multi-connected air conditioner provided by the present invention; Figure 4 It is a schematic structural diagram of the electronic device provided by the present invention. Detailed implementation manners

[0027] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] Figure 1 Describe a schematic flow chart of a control method for the expansion valve of the indoor unit of a multi-connected air conditioner of the present invention. The execution subject of this method is the outdoor unit of the air conditioner. This method includes: S11, detect whether there is a lost indoor unit, and based on the existence of a lost indoor unit, sort the lost indoor units according to the previously obtained indoor unit parameters to obtain a sorting result; S12, divide the lost indoor units according to the sorting result and a preset quantity to obtain at least two groups; among them, there is a power supply priority among the groups based on the sorting result; S13, based on the power supply priority, select each group for power supply in turn, and determine whether to adjust the group based on the voltages detected by the lost indoor units in the corresponding group, so as to control the opening degree of the expansion valve of the lost indoor units in the corresponding group or the adjusted group.

[0029] It should be noted that the step numbers "S1N" in this specification do not represent the sequence of the control method for the expansion valve of the indoor unit of the multi-connected air conditioner. The following will specifically combine Figure 2 Describe the control method for the expansion valve of the indoor unit of the multi-connected air conditioner of the present invention.

[0030] S11. Detect whether there is an indoor unit loss. Based on the existence of the indoor unit loss, sort the lost indoor units according to the previously obtained indoor unit parameters to obtain a sorting result.

[0031] In this embodiment, detecting whether there is an indoor unit loss includes: sending a communication signal to the indoor unit; determining whether information returned by the indoor unit based on the communication signal can be received within a preset time; if the information returned by the indoor unit based on the communication signal is not received within the preset time, it is determined that the corresponding indoor unit is lost.

[0032] It should be noted that by sending a communication signal to the indoor unit, it is convenient to determine whether communication is maintained with the indoor unit, so as to timely determine the lost indoor unit after the indoor unit is powered off, which is convenient for timely controlling the opening of the expansion valve, and avoiding abnormal refrigerant flow in the system due to power-off and the lost indoor unit being unable to control its own expansion valve, thus triggering situations such as system liquid return, excessive exhaust, and oil shortage.

[0033] In an alternative embodiment, for each lost indoor unit, sorting the lost indoor units according to the previously obtained indoor unit parameters to obtain a sorting result includes: sorting the corresponding lost indoor units based on a preset parameter priority and the previously obtained indoor unit parameters to obtain a sorting result. Further, sorting the corresponding lost indoor units based on a preset parameter priority and the previously obtained indoor unit parameters includes: selecting the indoor unit parameter with the highest priority based on the preset parameter priority for sorting to obtain an initial sorting result; if there are at least two lost indoor units with the same sorting in the initial sorting result, then sequentially select the indoor unit parameters of the next priority and sort the at least two lost indoor units with the same sorting again until the sorting of each lost indoor unit in the sorting result is inconsistent, and then stop to obtain the sorting result.

[0034] It should be noted that by sorting based on the preset parameter priority and the previously obtained indoor unit parameters, the sorting of the corresponding lost indoor units is facilitated, and then it is convenient to subsequently select groups for power supply based on the power supply priority, avoiding the situation that all lost indoor units perform expansion valve actions simultaneously, resulting in an excessive electrical load and thus being unable to accurately control the expansion valve. In addition, the preset parameter priority can be set based on actual power supply requirements, power supply costs, and safety, and no further limitation is made here.

[0035] In another alternative embodiment, correspondingly, sorting the lost indoor units according to the previously obtained indoor unit parameters to obtain a sorting result includes: obtaining the scores of the corresponding lost indoor units according to the previously obtained indoor unit parameters and using preset weights; sorting the corresponding lost indoor units from high to low according to the scores to obtain a sorting result.

[0036] It should be noted that by performing weighted summation on the previously obtained indoor unit parameters, the sorting of the lost indoor units is achieved, which facilitates subsequent power supply selection for each group in sequence based on the power supply priority, avoiding the situation where all lost indoor units simultaneously perform expansion valve actions, resulting in excessive power consumption load and thus unable to accurately control the expansion valve. Additionally, for each lost indoor unit, the weights of different indoor unit parameters can be set in advance based on actual power supply requirements, power supply costs, and safety, and no further limitations are imposed here.

[0037] In an alternative embodiment, the indoor unit parameters include at least one of the capacity of the indoor unit, the specification type of the expansion valve, the difference between the target opening and the actual opening of the expansion valve, and the estimated adjustment control completion time.

[0038] S12. Divide the lost indoor units according to the sorting result and a preset quantity to obtain at least two groups; among them, there is a power supply priority between each group based on the sorting result. It should be noted that the preset quantity can be set according to actual power consumption requirements, the communication distance between the indoor and outdoor units, and the actual power supply capacity during the actual design process. For example, when one outdoor unit controls ten indoor units, the preset quantity can be set to 3, and no further limitations are imposed here.

[0039] S13. Select each group for power supply in sequence based on the power supply priority, and determine whether to adjust the group based on the voltages detected by the lost indoor units in the corresponding group to control the expansion valve opening of the lost indoor units in the corresponding group or the adjusted group.

[0040] In this embodiment, selecting each group for power supply in sequence based on the power supply priority and determining whether to adjust the group based on the voltages detected by the lost indoor units in the corresponding group to control the expansion valve opening of the lost indoor units in the corresponding group or the adjusted group includes: selecting each group in sequence based on the power supply priority; for each selected group, control the power supply to the corresponding group and receive the detected voltages sent by the lost indoor units in the selected group; determine whether each detected voltage is greater than or equal to a preset threshold; if each detected voltage is greater than or equal to the preset threshold, then control the expansion valve opening of the lost indoor units in the corresponding group.

[0041] It is worth noting that by selecting group power supply in sequence based on the power supply priority, the situation where all lost indoor units simultaneously perform expansion valve actions, resulting in excessive power consumption load and thus unable to accurately control the expansion valve, is avoided. And by determining whether the detected voltages of all lost motors in the same group are lower than the preset threshold, the power supply requirements of all lost indoor units in this group are determined. Thus, when the power supply requirements of all lost indoor units in this group can be met, the expansion valve opening of the lost indoor units in the corresponding group is controlled, achieving reasonable control of the expansion valve opening.

[0042] In an alternative embodiment, determining whether each detected voltage is greater than or equal to a preset threshold further includes: if there is a detected voltage less than the preset threshold, removing the lost indoor unit with the minimum detected voltage from the corresponding group to obtain an updated group, and sequentially adding the lost indoor unit with the minimum detected voltage to the next group; re-controlling the power supply to the updated group, and re-receiving the detected voltages sent by each lost indoor unit in the updated group to re-determine whether each received detected voltage is greater than or equal to the preset threshold until the detected voltages of each lost indoor unit in the corresponding group are all greater than or equal to the preset threshold, and controlling the opening degree of the expansion valve of the lost indoor unit in the corresponding group.

[0043] It should be added that in the case where the power supply requirements of all lost indoor units in the group cannot be met, by adjusting the number of lost indoor units in the current group and re-supplying power to the adjusted group, to re-determine based on the detected voltages of each lost indoor unit in the adjusted group whether the power supply requirements of the adjusted group can be met simultaneously, avoiding the situation where the electrical load is too large and the voltage is insufficient to accurately control the expansion valve, and realizing the reasonable control of the expansion valve opening degree.

[0044] In an alternative embodiment, for each selected group, controlling the power supply to the corresponding group and receiving the detected voltages sent by each lost indoor unit in the selected group includes: for each selected group, controlling the loading of a weak power supply to the communication bus; receiving the detected voltages based on the detection of the communication bus sent by each lost indoor unit in the selected group.

[0045] Further, when controlling the loading of the weak power supply to the communication bus, the outdoor unit chip controls the outdoor unit weak power supply circuit to supply power to the communication bus.

[0046] It should be noted that by loading a weak current to the communication bus, it is convenient for the lost indoor unit to detect the voltage of the communication bus to determine the influence of the length of the communication bus on voltage attenuation, and further facilitate the subsequent determination of whether the communication bus can meet the power consumption requirements of all lost indoor units in the corresponding group.

[0047] In addition, controlling the opening degree of the expansion valve of the lost indoor unit in the corresponding group includes: using the weak current loaded to the communication bus to supply power to the indoor unit chips of each lost indoor unit in the corresponding group, so as to control the opening degree of the corresponding expansion valve by using the indoor unit chips.

[0048] Further, the indoor unit weak power supply circuit detects the weak power supply of the communication bus and supplies power to the indoor unit chip to control the opening degree of the expansion valve.

[0049] It should be noted that by using the communication bus, power is supplied to the indoor unit chips of the corresponding lost indoor units to ensure that only the opening degrees of the expansion valves of the corresponding lost indoor units are controlled, avoiding the activation of other power-consuming devices, minimizing power consumption to the greatest extent, and thus controlling the expansion valves of more lost indoor units simultaneously as much as possible.

[0050] In summary, in the embodiment of the present invention, it is detected and determined that an indoor unit is lost, and the lost indoor units are sorted by priority, so as to facilitate grouping the lost indoor units according to the sorting result and the preset quantity, initially determining the lost indoor units whose expansion valve opening degrees can be synchronously controlled, and further determining whether the power supply requirements of the corresponding groups can be simultaneously met based on the detected voltages of the lost indoor units in the same group, thereby adjusting the number of expansion valves of the lost indoor units controlled simultaneously, reasonably controlling the opening degrees of the expansion valves of the lost indoor units, achieving rapid response to various demand changes of the system, ensuring the normal operation of the multi-connected air-conditioning system, and improving the product quality.

[0051] Next, the multi-connected indoor unit expansion valve control device provided by the present invention will be described. The multi-connected indoor unit expansion valve control device described below can be mutually referred to corresponding to the multi-connected indoor unit expansion valve control method described above.

[0052] Figure 3 The structural schematic diagram of a multi-connected indoor unit expansion valve control device is shown. The device includes: A detection module 31, which detects whether there is a lost indoor unit, and based on the existence of a lost indoor unit, sorts the lost indoor units based on the previously obtained indoor unit parameters to obtain a sorting result; A grouping module 32, which divides the lost indoor units according to the sorting result and the preset quantity to obtain at least two groups; among them, there is a power supply priority among the groups based on the sorting result; A control module 33, which sequentially selects each group for power supply based on the power supply priority, and determines whether to adjust the group based on the voltages detected by the lost indoor units in the corresponding group, so as to control the expansion valve opening degrees of the lost indoor units in the corresponding group or the adjusted group.

[0053] In this embodiment, the detection module 31 includes: a signal sending unit, which sends a communication signal to the indoor unit; a signal judgment unit, which determines whether the information returned by the indoor unit based on the communication signal can be received within a preset time; a loss determination unit, which determines that the corresponding indoor unit is lost if the information returned by the indoor unit based on the communication signal is not received within the preset time.

[0054] In addition, the detection module 31 further includes: a sorting unit, which sorts the lost indoor units based on the previously obtained indoor unit parameters to obtain a sorting result. Specifically, the sorting unit is used to: sort the corresponding lost indoor units based on the preset parameter priority and the previously obtained indoor unit parameters to obtain a sorting result.

[0055] Further, the sorting unit includes: a first sorting subunit, which selects the indoor unit parameter with the highest priority based on the preset parameter priority for sorting to obtain an initial sorting result; a second sorting subunit, if there are at least two lost indoor units with the same sorting in the initial sorting result, sequentially selects the indoor unit parameters of the next priority to sort the at least two lost indoor units with the same sorting again until the sorting of each lost indoor unit in the sorting result is inconsistent, and then stops to obtain the sorting result.

[0056] In an alternative embodiment, the sorting unit further includes: a weighting subunit, which obtains the scores corresponding to the lost indoor units according to the previously obtained indoor unit parameters and using the preset weights; a sorting subunit, which sorts the corresponding lost indoor units from high to low according to the scores to obtain the sorting result.

[0057] The control module 33 includes: a grouping unit, which sequentially selects groups based on the power supply priority; a power supply unit, which controls the power supply to the corresponding group for each selected group and receives the detection voltages sent by each lost indoor unit in the selected group; a voltage judgment unit, which determines whether each detection voltage is greater than or equal to a preset threshold; a control unit, if each detection voltage is greater than or equal to the preset threshold, controls the expansion valve opening degree of the lost indoor units in the corresponding group.

[0058] In an alternative embodiment, the control module 33 further includes: a grouping update unit, if there is a detection voltage less than the preset threshold, removes the lost indoor unit with the minimum detection voltage from the corresponding group to obtain an updated group, and sequentially adds the lost indoor unit with the minimum detection voltage to the next group; a power supply control unit, which re-controls the power supply to the updated group and re-receives the detection voltages sent by each lost indoor unit in the updated group to re-determine whether each received detection voltage is greater than or equal to the preset threshold until the detection voltages of each lost indoor unit in the corresponding group are greater than or equal to the preset threshold, and controls the expansion valve opening degree of the lost indoor units in the corresponding group.

[0059] In an alternative embodiment, the power supply unit includes: a power supply loading subunit, which controls the loading of a weak power supply to the communication bus for each selected group; a voltage receiving subunit, which receives the detection voltages obtained based on the detection of the communication bus sent by each lost indoor unit in the selected group. Further, when controlling the loading of the weak power supply to the communication bus, the outdoor unit chip controls the outdoor unit weak power supply circuit to supply power to the communication bus.

[0060] In addition, the control unit is used to: supply power to the indoor unit chips of each lost indoor unit in the corresponding group by using the weak current loaded to the communication bus, so as to control the expansion valve opening degree by using the indoor unit chips. Further, the indoor unit weak power supply circuit detects the weak power supply of the communication bus and supplies power to the indoor unit chips to control the expansion valve opening degree.

[0061] In summary, in the embodiment of the present invention, the detection module is used to detect and determine the loss of the indoor unit, so as to sort the lost indoor units by priority, so that the grouping module can group the lost indoor units according to the sorting result and the preset quantity, so as to preliminarily determine the lost indoor units that can synchronously control the opening degree of the expansion valve. Further, the control module determines whether the power supply requirements of the corresponding group can be simultaneously met based on the detection voltages of the lost indoor units in the same group, so as to adjust the number of expansion valves of the lost indoor units controlled simultaneously, so as to reasonably control the opening degree of the expansion valves of the lost indoor units, realizing a quick response to various demand changes of the system, ensuring the normal operation of the multi-connected air conditioner system, and improving the product quality.

[0062] Figure 4 An example of the physical structure diagram of an electronic device is shown as Figure 4 shown. The electronic device may include: a processor 410, a communication interface 420, a memory 430, and a communication bus 440. Among them, the processor 410, the communication interface 420, and the memory 430 communicate with each other through the communication bus 440. The processor 410 can call the logical instructions in the memory 430 to execute the method for controlling the expansion valve of the indoor unit of the multi-connected air conditioner. The method includes: detecting whether there is a loss of the indoor unit, and based on the existence of the loss of the indoor unit, sorting the lost indoor units based on the previously obtained indoor unit parameters to obtain a sorting result; dividing the lost indoor units according to the sorting result and the preset quantity to obtain at least two groups; among them, there is a power supply priority between the groups based on the sorting result; based on the power supply priority, each group is sequentially selected for power supply, and whether to adjust the group is determined based on the voltages detected by the lost indoor units in the corresponding group, so as to control the expansion valves of the lost indoor units in the corresponding group or the adjusted group.

[0063] In addition, when the logical instructions in the above-mentioned memory 430 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc that can store program codes.

[0064] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the multi-connected indoor unit expansion valve control method provided by each of the above methods. The method includes: detecting whether there is a lost indoor unit, and based on the existence of the lost indoor unit, sorting the lost indoor units based on the previously obtained indoor unit parameters to obtain a sorting result; dividing the lost indoor units according to the sorting result and a preset quantity to obtain at least two groups; wherein, there is a power supply priority among the groups based on the sorting result; based on the power supply priority, successively select each group for power supply, and determine whether to adjust the group based on the voltages detected by the lost indoor units in the corresponding group, so as to control the expansion valve opening degrees of the lost indoor units in the corresponding group or the adjusted group.

[0065] In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is configured to execute the multi-connected indoor unit expansion valve control method provided by each of the above. The method includes: detecting whether there is a lost indoor unit, and based on the existence of the lost indoor unit, sorting the lost indoor units based on the previously obtained indoor unit parameters to obtain a sorting result; dividing the lost indoor units according to the sorting result and a preset quantity to obtain at least two groups; wherein, there is a power supply priority among the groups based on the sorting result; based on the power supply priority, successively select each group for power supply, and determine whether to adjust the group based on the voltages detected by the lost indoor units in the corresponding group, so as to control the expansion valve opening degrees of the lost indoor units in the corresponding group or the adjusted group.

[0066] The device embodiments described above are merely illustrative. 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 may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative labor.

[0067] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solution, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for an expansion valve of a multi-connected indoor unit, characterized in that, Including: Detect whether there is an indoor unit loss, and based on the existence of the indoor unit loss, sort the lost indoor units according to the previously obtained indoor unit parameters to obtain a sorting result; Divide the lost indoor units according to the sorting result and a preset quantity to obtain at least two groups; wherein, there is a power supply priority among the groups based on the sorting result; Based on the power supply priority, select each group for power supply in sequence, and determine whether to adjust the group based on the voltages detected by the lost indoor units in the corresponding group, so as to control the expansion valve opening degrees of the lost indoor units in the corresponding group or the adjusted group.

2. The control method for the expansion valve of the indoor unit of the multi-connected air conditioner according to claim 1, wherein Based on the power supply priority, select each group for power supply in sequence, and determine whether to adjust the group based on the voltages detected by the lost indoor units in the corresponding group, so as to control the expansion valve opening degrees of the lost indoor units in the corresponding group or the adjusted group, including: Based on the power supply priority, select groups in sequence; For each selected group, control the power supply to the corresponding group, and receive the detected voltages sent by the lost indoor units in the selected group; Determine whether each of the detected voltages is greater than or equal to a preset threshold; If each of the detected voltages is greater than or equal to the preset threshold, control the expansion valve opening degrees of the lost indoor units in the corresponding group.

3. The multi-connected indoor unit expansion valve control method according to claim 2, characterized in that Determine whether each of the detected voltages is greater than or equal to a preset threshold, and further include: If there is a detected voltage less than the preset threshold, remove the lost indoor unit with the smallest detected voltage from the corresponding group to obtain an updated group, and sequentially add the lost indoor unit with the smallest detected voltage to the next group; Re-control the power supply to the updated group, and re-receive the detected voltages sent by the lost indoor units in the updated group to re-determine whether each received detected voltage is greater than or equal to the preset threshold, until the detected voltages of the lost indoor units in the corresponding group are all greater than or equal to the preset threshold, and control the expansion valve opening degrees of the lost indoor units in the corresponding group.

4. The multi-connected indoor unit expansion valve control method according to claim 2, wherein For each selected group, control the power supply to the corresponding group, and receive the detected voltages sent by the lost indoor units in the selected group, including: For each selected group, control the loading of a weak power supply to the communication bus; Receive the detected voltages obtained based on the detection of the communication bus sent by the lost indoor units in the selected group.

5. The control method for the expansion valve of the indoor unit of the multi-connected air conditioner according to claim 4, wherein Control the expansion valve opening degrees of the lost indoor units in the corresponding group, including: Use the weak current loaded to the communication bus to supply power to the indoor unit chips of the lost indoor units in the corresponding group, so as to control the corresponding expansion valve opening degrees by using the indoor unit chips.

6. The control method of the expansion valve of the indoor unit of the multi-connected air conditioner according to claim 1, characterized in that, Sort the lost indoor units according to the previously obtained indoor unit parameters to obtain a sorting result, including: Based on a preset parameter priority and the previously obtained indoor unit parameters, sort the corresponding lost indoor units to obtain a sorting result; or, According to the previously obtained indoor unit parameters, use a preset weight to obtain the scores of the corresponding lost indoor units; Sort the corresponding lost indoor units from high to low according to the scores to obtain a sorting result.

7. The control method for the expansion valve of the indoor unit of the multi-connected air conditioner according to claim 1, characterized in that, Detect whether there is an indoor unit loss, including: Send a communication signal to the indoor unit; Determine whether the information returned by the indoor unit based on the communication signal can be received within a preset time; If the information returned by the indoor unit based on the communication signal is not received within the preset time, determine that the corresponding indoor unit is lost.

8. A control device for an expansion valve of an indoor unit of a multi-connected air conditioner, characterized in that, Including: A detection module that detects whether there is an indoor unit loss, and based on the presence of an indoor unit loss, sorts the lost indoor units according to the previously obtained indoor unit parameters to obtain a sorting result; A grouping module that divides the lost indoor units according to the sorting result and a preset quantity to obtain at least two groups; wherein, there is a power supply priority among the groups based on the sorting result; A control module that sequentially selects each group for power supply based on the power supply priority, and determines whether to adjust the group based on the voltages detected by the lost indoor units in the corresponding group, so as to control the opening degree of the expansion valves of the lost indoor units in the corresponding group or the adjusted group.

9. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, the steps of the multi-connected indoor unit expansion valve control method according to any one of claims 1 to 7 are implemented.

10. A non-transitory computer-readable storage medium storing a computer program thereon, characterized in that, When the computer program is executed by the processor, the steps of the multi-connected indoor unit expansion valve control method according to any one of claims 1 to 7 are implemented.

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