Multi-connected air conditioner, control method and device thereof, and readable storage medium

Abstract

The application provides a multi-connected air conditioner, a control method and device thereof, and a readable storage medium. In the case that the multi-connected air conditioner is provided with multiple outdoor units and multiple electronic expansion valves, the control method comprises: in the case that it is determined that the multi-connected air conditioner has a lack of refrigerant fault, controlling the multi-connected air conditioner to perform a reset operation, recording an interval time M of the reset, comparing the interval time M with a first time threshold M 阈1 to determine whether the multi-connected air conditioner continues to run according to a first comparison result; wherein the reset operation comprises: controlling the electronic expansion valve of the first outdoor unit to open to a maximum opening degree and last for q time. Comparing the interval time M of the reset with a first time threshold M 阈1 to determine whether the multi-connected air conditioner continues to run, which is convenient for the multi-connected air conditioner to identify the fault that does not need to be stopped, can control the multi-connected air conditioner to continue to run in the case that it does not need to be stopped, and improves the experience of the user.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and more specifically, to a multi-split air conditioner and its control method, control device, and readable storage medium. Background Technology

[0002] Multi-split air conditioners may experience refrigerant shortages during use, triggering a shutdown protection system. However, in actual installation, a problem arises: in some cases, a refrigerant shortage does not affect the normal operation of the multi-split air conditioner. The system fails to recognize this unnecessary shutdown, causing it to stop and negatively impacting the user experience. Summary of the Invention

[0003] Therefore, the present invention provides a multi-split air conditioner and its control method, control device and readable storage medium, which enables the multi-split air conditioner to identify fault conditions that do not require shutdown, reduce the number of shutdowns of the multi-split air conditioner and improve the user experience.

[0004] To address the aforementioned problems, this invention provides a control method for a multi-split air conditioner. In cases where the multi-split air conditioner has multiple outdoor units and multiple electronic expansion valves, the control method includes: upon determining that the multi-split air conditioner has a refrigerant shortage fault, controlling the multi-split air conditioner to perform a reset operation, recording the reset interval M, and comparing the interval M with a first time threshold M. 阈1 A comparison is made to obtain a first comparison result; based on the first comparison result, it is determined whether the multi-split air conditioner should continue to operate; the reset operation includes: controlling the electronic expansion valve of the first outdoor unit to open to the maximum opening degree and maintaining it for a time q, wherein the first outdoor unit is the outdoor unit that has not been running for a time q.

[0005] Compared with existing technologies, the technical effect achieved by this technical solution is: to adjust the reset interval M and the first time threshold M. 阈1 By comparing the data, it can be determined whether the multi-split air conditioner should continue to operate. This helps the multi-split air conditioner identify faults that do not require shutdown and allows it to continue operating without needing to stop, thus improving the user experience.

[0006] Furthermore, before determining that the multi-split air conditioner has a refrigerant shortage fault, the control method also includes: recording the number of resets n of the multi-split air conditioner, comparing the number of resets n with the reset number threshold N, wherein if the number of resets n is greater than the reset number threshold N, then the multi-split air conditioner is determined to have a refrigerant shortage fault.

[0007] Compared with existing technologies, the technical effect achieved by this solution is as follows: During the reset of a multi-split air conditioner, the refrigerant status of the air conditioner is assessed. When the number of resets (n) exceeds the reset threshold (N), the multi-split air conditioner is determined to have a refrigerant shortage fault.

[0008] Furthermore, determining whether a multi-split air conditioner should continue operating specifically includes: obtaining the average interval time M based on the interval time M. 均 The average interval time M 均 With the first time threshold M 阈1 Comparison, at the average interval M 均 Greater than or equal to the first time threshold M 阈1 In this case, it is determined that the multi-split air conditioner can continue to operate; among them, n represents the number of times the multi-split air conditioner can be reset.

[0009] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: The average interval time M is calculated based on the interval time M. 均 Average interval M 均 Greater than or equal to the first time threshold M 阈1 When a multi-split air conditioner is in use, resetting it can resolve the fault, allowing the multi-split air conditioner to continue operating without requiring a shutdown protection mechanism.

[0010] Furthermore, if it is determined that the multi-split air conditioner can continue to operate, the control method also includes: if the first outdoor unit stops, controlling the multi-split air conditioner to operate every M... f The system is timed to reset the multi-split air conditioner; the electronic expansion valve is opened to its maximum degree, and the high-pressure P and outer ring temperature T of the multi-split air conditioner are obtained; the high-pressure P is compared with the first pressure threshold P. 阈1 Second pressure threshold P 阈2 The outer ring temperature T is compared with the first temperature threshold T. 阈1 Second temperature threshold T 阈2 A comparison is performed to obtain a second comparison result; if the second comparison result meets one of the following judgment conditions, the number of resets n is reset to zero; wherein, the judgment conditions include: the high pressure P is less than or equal to the first pressure threshold P. 阈1 And the outer ring temperature T is greater than or equal to the first temperature threshold T 阈1 Or the high pressure P is greater than the second pressure threshold P 阈2 Less than the first pressure threshold P 阈1 And the outer ring temperature T is greater than the second temperature threshold T 阈2 Less than the first temperature threshold T 阈1 Or, the high pressure P is less than or equal to the second pressure threshold P. 阈2 And the outer ring temperature T is less than or equal to the second temperature threshold T阈2 Secondly, M f By the M 均 Sure.

[0011] Compared with existing technologies, the technical effects achieved by adopting this technical solution are: Multi-split air conditioners can achieve the following results every M... f The system resets once per cycle, continuously monitoring the high-pressure P and outer ring temperature T of the multi-split air conditioner, and comparing the high-pressure P with the first pressure threshold P. 阈1 Second pressure threshold P 阈2 The outer ring temperature T is compared with the first temperature threshold T. 阈1 Second temperature threshold T 阈2 The system compares the results and determines whether the reset count n of the multi-split air conditioner is cleared to zero. If the reset count n is cleared to zero, or if the reset count n is less than the reset count threshold N, the multi-split air conditioner can perform a reset operation and continue operating, thus improving the user experience.

[0012] Furthermore, the average interval M 均 With the first time threshold M 阈1 In comparison, the control methods also include: in M 均 Less than the first time threshold M 阈1 In this situation, the multi-split air conditioner cannot continue to operate, and the control system for the multi-split air conditioner determines the cause of the malfunction.

[0013] Compared with existing technologies, the technical effects achieved by adopting this technical solution are: when a multi-split air conditioner cannot continue to operate, the cause of the failure can be determined, which facilitates maintenance personnel in repairing the multi-split air conditioner, improves maintenance efficiency, and saves maintenance costs.

[0014] Furthermore, the control system determines the cause of the malfunction that prevents the multi-split air conditioner from continuing operation, specifically including: setting the average interval time M... 均 With the second time threshold M 阈2 The comparisons are made to obtain a third comparison result; based on the third comparison result, the cause of the multi-split air conditioner's inability to continue operating is determined.

[0015] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: the comparison results of the average interval time M_average and the second time threshold M_threshold2 are obtained, which further determines the cause of the multi-split air conditioner's failure to operate, making the determination of the cause of the multi-split air conditioner's failure more accurate, improving the accuracy of identifying the cause of the failure, and at the same time facilitating maintenance personnel to carry out maintenance and saving maintenance time.

[0016] Furthermore, based on the third comparison result, the cause of the multi-split air conditioner's inability to continue operating is determined, specifically including: within the average interval time M 均 Greater than or equal to the second time threshold M阈2 In this case, the cause of the multi-split air conditioner's inability to continue operating is determined to be a leak in the outdoor unit's parts; within the average interval M 均 Less than the second time threshold M 阈2 In this case, the cause of the multi-split air conditioner's inability to continue operating is determined to be a lack of refrigerant.

[0017] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: based on the average interval time M 均 With the second time threshold M 阈2 The comparison results accurately identify the causes of faults in multi-split air conditioners, making it easier for repair personnel to carry out repairs and improving the user experience.

[0018] Furthermore, the present invention also provides a control device capable of executing a control method, specifically including: a judgment module, which judges whether the multi-split air conditioner has a refrigerant shortage fault; a control module, which controls the multi-split air conditioner to perform a reset operation and continue operation; a recording module, which records the reset interval time M; and a comparison module, which compares the interval time M with a first time threshold M. 阈1 The comparison is performed to obtain the first comparison result, which is then fed back to the judgment module.

[0019] Compared with existing technologies, the technical effects achieved by this solution are as follows: the control module issues commands to the multi-split air conditioner to perform a reset operation; the recording module records the reset interval M, providing data for identifying the cause of the multi-split air conditioner's malfunction; and the comparison module compares the interval M with a first time threshold M. 阈1 The comparison is then fed back to the judgment module. Based on the comparison results, the judgment module determines whether the multi-split air conditioner can continue to operate, and controls the multi-split air conditioner to continue operating through the control module. This identifies situations where the multi-split air conditioner can continue to operate, reducing the number of times the multi-split air conditioner stops, thereby improving the user experience.

[0020] Furthermore, the present invention also provides a multi-split air conditioner and a multi-split air conditioner execution control method. The multi-split air conditioner includes: multiple outdoor units; multiple electronic expansion valves, wherein the multiple electronic expansion valves are disposed on the multiple outdoor units.

[0021] Compared with the prior art, the technical effect achieved by adopting this technical solution is that the multi-split air conditioner of the present invention implements the control method of the multi-split air conditioner of any technical solution of the present invention. Therefore, it has all the beneficial effects of the control method of the multi-split air conditioner of any technical solution of the present invention, which will not be repeated here.

[0022] Furthermore, the present invention also provides a readable storage medium, which includes a stored computer program, wherein the computer program, when run by a processor, controls the device where the storage medium is located to execute a control method for a multi-split air conditioner.

[0023] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: The readable storage medium of the present invention implements the control method of the multi-split air conditioner of any technical solution of the present invention. Therefore, it has all the beneficial effects of the control method of the multi-split air conditioner of any technical solution of the present invention, which will not be repeated here.

[0024] By adopting the technical solution of the present invention, the following technical effects can be achieved:

[0025] (1) The reset interval M is compared with the first time threshold M. 阈1 By comparing the data, it can be determined whether the multi-split air conditioner should continue to run. This helps the multi-split air conditioner identify faults that require shutdown and allows it to continue running even when shutdown is not necessary, thus improving the user experience.

[0026] (2) When resetting the multi-split air conditioner, assess the refrigerant status of the multi-split air conditioner. If the number of resets n of the multi-split air conditioner is greater than the reset number threshold N, the multi-split air conditioner is determined to have a refrigerant shortage fault.

[0027] (3) If the multi-split air conditioner cannot continue to operate, continue to determine the reason why the multi-split air conditioner cannot operate, so as to facilitate the maintenance personnel to repair the multi-split air conditioner, improve the maintenance efficiency, and save the maintenance cost. Attached Figure Description

[0028] Figure 1 This is a first flowchart of a control method for a multi-split air conditioner provided in an embodiment of the present invention.

[0029] Figure 2 The second flowchart is provided for the control method in an embodiment of the present invention.

[0030] Figure 3 The third flowchart is provided for the control method in an embodiment of the present invention.

[0031] Figure 4 The fourth flowchart is provided for the control method in an embodiment of the present invention.

[0032] 100: Control device; 110: Judgment module; 120: Control module; 130: Recording module; 140: Comparison module; 200: Outdoor unit; 210: Electronic expansion valve. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This invention provides a control method for a multi-split air conditioner. When the multi-split air conditioner has multiple outdoor units and multiple electronic expansion valves, the control method includes: when a refrigerant shortage fault is determined in the multi-split air conditioner, controlling the multi-split air conditioner to perform a reset operation, recording the reset interval M, and comparing the interval M with a first time threshold M. 阈1 A comparison is made to obtain a first comparison result; based on the first comparison result, it is determined whether the multi-split air conditioner should continue to operate; the reset operation includes: controlling the electronic expansion valve of the first outdoor unit to open to the maximum opening degree and maintaining it for a time q, wherein the first outdoor unit is the outdoor unit that has not been running for a time q.

[0035] For details, see attached. Figure 1 As shown, a multi-split air conditioner is equipped with multiple outdoor units and multiple electronic expansion valves;

[0036] S100 multi-split air conditioner has a refrigerant shortage fault;

[0037] S200: Control the multi-split air conditioner to perform a reset operation and record the reset interval time M;

[0038] S300, compare the interval time M with the first time threshold M 阈1 By comparison, the first comparison result is obtained;

[0039] S400: Determine whether the multi-split air conditioner should continue to operate.

[0040] For example, a multi-split air conditioner has multiple outdoor units. If the first outdoor unit, which has not been running for a continuous period Q, experiences reduced sealing, leading to refrigerant leakage, or if the multi-split air conditioner system has not been replenished with refrigerant, resulting in a refrigerant shortage, the refrigerant interval M will be compared with the first time threshold M. 阈1 By comparing the data, it can be determined whether the multi-split air conditioner should continue to operate. This helps the multi-split air conditioner identify faults that do not require shutdown and allows it to continue operating without needing to stop, thus improving the user experience.

[0041] Preferably, the Q time is one month, two months, three months, or one year; where the first time threshold T 阈1 The duration is 2 to 4 hours, preferably 2 hours, 3 hours, 3.5 hours and 4 hours.

[0042] Specifically, before determining that the multi-split air conditioner has a refrigerant shortage fault, the control method also includes: recording the number of resets n of the multi-split air conditioner, comparing the number of resets n with the reset number threshold N, wherein if the number of resets n is greater than the reset number threshold N, then the multi-split air conditioner is determined to have a refrigerant shortage fault.

[0043] Specifically, when a multi-split air conditioner performs a reset, if the number of resets (n) exceeds the reset threshold (N), it is determined that the multi-split air conditioner has a refrigerant shortage fault. During the reset operation, the electronic expansion valve opens to its maximum degree, controlling the refrigerant flow and resolving the refrigerant shortage fault. However, frequent resets, with the number of resets (n) exceeding the reset threshold (N), indicate that the reset operation cannot resolve the refrigerant shortage fault. Therefore, further investigation is needed to determine the cause of the refrigerant shortage fault in the multi-split air conditioner.

[0044] Specifically, determining whether a multi-split air conditioner should continue operating includes: obtaining the average interval time M based on the interval time M. 均 The average interval time M 均 With the first time threshold M 阈1 Comparison; at the average interval M 均 Greater than or equal to the first time threshold M 阈1 In this case, it is determined that the multi-split air conditioner can continue to operate; among them, n represents the number of times the multi-split air conditioner can be reset.

[0045] Specifically, as shown in the appendix Figure 2 As shown, determine whether the multi-split air conditioner should continue to operate;

[0046] S100, Obtain the average interval time M 均 ;

[0047] S110, Average interval time M 均 With the first time threshold M 阈1 Compare;

[0048] S200, control the multi-split air conditioner to continue operating;

[0049] S300 multi-split air conditioners cannot continue to operate;

[0050] Among them, in M 均 ≥M 阈1 In the case of S200, execute; in M 均 <M 阈1 In this case, execute S300.

[0051] Specifically, when the average interval time M 均 Greater than or equal to the first time threshold M 阈1In this case, multi-split air conditioners reset fewer times per unit time and have longer reset intervals. Therefore, multi-split air conditioners can continue to operate after resetting without needing to be shut down, thereby reducing the number of shutdowns and improving the user experience.

[0052] Specifically, when it is determined that the multi-split air conditioner can continue to operate, the control method also includes: if the first outdoor unit stops, controlling the multi-split air conditioner to operate every M... f The system is timed to reset the multi-split air conditioner; the electronic expansion valve is opened to its maximum degree, and the high-pressure P and outer ring temperature T of the multi-split air conditioner are obtained; the high-pressure P is compared with the first pressure threshold P. 阈1 Second pressure threshold P 阈2 The outer ring temperature T is compared with the first temperature threshold T. 阈1 Second temperature threshold T 阈2 A comparison is performed to obtain a second comparison result; if the second comparison result meets one of the following judgment conditions, the number of resets n is reset to zero; wherein, the judgment conditions include: the high pressure P is less than or equal to the first pressure threshold P. 阈1 And the outer ring temperature T is greater than or equal to the first temperature threshold T 阈1 Or the high pressure P is greater than the second pressure threshold P 阈2 Less than the first pressure threshold P 阈1 And the outer ring temperature T is greater than the second temperature threshold T 阈2 Less than the first temperature threshold T 阈1 Or, the high pressure P is less than or equal to the second pressure threshold P. 阈2 And the outer ring temperature T is less than or equal to the second temperature threshold T 阈2 Secondly, M f By the M 均 Sure.

[0053] Specifically, as shown in the appendix Figure 3 As shown;

[0054] S100: Control the multi-split air conditioner to continue operating;

[0055] S200, Control of Multi-Split Air Conditioning Interval M f Time reset;

[0056] S300: Obtain the high-pressure P and outer ring temperature T of the multi-split air conditioner;

[0057] S400, P and P 阈1 and P 阈2 Compare T with T 阈1 and T 阈2 Compare;

[0058] S500, if the judgment condition is met, the reset count n is cleared to zero.

[0059] in,

[0060] The reset count n is cleared to zero, allowing the multi-split air conditioner to resume operation by performing the reset operation again, thus reducing the number of times the multi-split air conditioner stops.

[0061] Multi-split air conditioner every M f The system resets once per cycle, continuously monitoring the high-pressure P and outer ring temperature T of the multi-split air conditioner, and comparing the high-pressure P with the first pressure threshold P. 阈1 Second pressure threshold P 阈2 The outer ring temperature T is compared with the first temperature threshold T. 阈1 Second temperature threshold T 阈2 The system compares the results and determines whether the reset count n of the multi-split air conditioner is cleared to zero. If the reset count n is cleared to zero, or if the reset count n is less than the reset count threshold N, the multi-split air conditioner can perform a reset operation and continue operating, thus improving the user experience.

[0062] Among them, the first pressure threshold P 阈1 The first pressure threshold is 1.2 MPa to 1.4 MPa, preferably 1.2 MPa, 1.3 MPa, 1.33 MPa, and 1.35 MPa; the second pressure threshold P2 is 0.7 to 1.2 MPa, preferably 0.7 MPa, 0.88 MPa, 1.0 MPa, and 1.2 MPa; the first temperature threshold T... 阈1 The temperature range is 20°C to 30°C, preferably 20°C, 23°C, 27°C, and 30°C; the second temperature threshold T 阈2 The temperature ranges from 5°C to 20°C, with 5°C, 10°C, 16°C, and 20°C being preferred.

[0063] Specifically, the average interval time M 均 With the first time threshold M 阈1 In comparison, the control methods also include: in M 均 Less than the first time threshold M 阈1 In this situation, the multi-split air conditioner cannot continue to operate, and the control system for the multi-split air conditioner determines the cause of the malfunction.

[0064] Specifically, if a multi-split air conditioner cannot continue to operate, continue to determine the cause of the malfunction. This will facilitate repairs by maintenance personnel, improve repair efficiency, and save on repair costs.

[0065] Specifically, the control of multi-split air conditioners determines the cause of malfunctions that prevent them from continuing operation, including: setting the average interval time M. 均 With the second time threshold M 阈2The comparisons are made to obtain a third comparison result; based on the third comparison result, the cause of the multi-split air conditioner's inability to continue operating is determined.

[0066] Specifically, the comparison results of the average interval time M_average and the second time threshold M_threshold2 are obtained to further determine the cause of the multi-split air conditioner's failure to operate, making the determination of the cause of the multi-split air conditioner's failure more accurate, improving the accuracy of identifying the cause of the failure, and at the same time facilitating maintenance personnel to carry out maintenance and saving maintenance time.

[0067] Preferably, based on the third comparison result, the cause of the multi-split air conditioner's inability to continue operating is determined, specifically including: within the average interval time M 均 Greater than or equal to the second time threshold M 阈2 In this case, the cause of the multi-split air conditioner's inability to continue operating is determined to be a leak in the outdoor unit's parts; within the average interval M 均 Less than the second time threshold M 阈2 In this case, the cause of the multi-split air conditioner's inability to continue operating is determined to be a lack of refrigerant.

[0068] Specifically, as shown in the appendix Figure 4 As shown;

[0069] S100, Control the multi-split air conditioner to determine the cause of the fault that it cannot continue to operate;

[0070] S110, Average interval time M 均 With the second time threshold M 阈2 Compare;

[0071] S200, outdoor unit parts leakage;

[0072] S300, system is low on refrigerant;

[0073] Among them, in M 均 <M 阈2 In the case of S200, execute; in M 均 ≥M 阈2 In this case, execute S300.

[0074] Specifically, based on the average interval M 均 With the second time threshold M 阈2 The comparison results accurately identify the causes of faults in multi-split air conditioners, facilitating repairs for technicians and improving the user experience. Among these, the second time threshold M... 阈2 The duration is 0 to 2 hours, preferably 0.5 hours, 1 hour, 1.5 hours and 1.7 hours.

[0075] This invention also provides a control device capable of executing a control method, specifically including: a judgment module 110, which judges whether a multi-split air conditioner has a refrigerant shortage fault; a control module 120, which controls the multi-split air conditioner to perform a reset operation and continue running; a recording module 130, which records the reset interval time M; and a comparison module 140, which compares the interval time M with a first time threshold M. 阈1 The comparison is performed to obtain the first comparison result, which is then fed back to the judgment module 110.

[0076] Specifically, the control module 120 issues a command to the multi-split air conditioner to perform a reset operation, the recording module 130 records the reset interval M to provide data for identifying the cause of the multi-split air conditioner's inability to operate, and the comparison module 140 compares the interval M with a first time threshold M. 阈1 The comparison is then fed back to the judgment module 110. Based on the comparison results, the judgment module 110 determines whether the multi-split air conditioner can continue to operate, identifies situations where the multi-split air conditioner can continue to operate, reduces the number of times the multi-split air conditioner stops, and thus improves the user experience.

[0077] Specifically, this invention also provides a multi-split air conditioner and a multi-split air conditioner control method. The multi-split air conditioner includes: multiple outdoor units 200; multiple electronic expansion valves 210, which are disposed on the multiple outdoor units 200.

[0078] Specifically, the multi-split air conditioner of the present invention implements the control method of the multi-split air conditioner of any technical solution of the present invention, and therefore has all the beneficial effects of the control method of the multi-split air conditioner of any technical solution of the present invention, which will not be repeated here.

[0079] Specifically, the present invention also provides a readable storage medium, which includes a stored computer program, wherein the computer program, when run by a processor, controls the device where the storage medium is located to execute a control method for a multi-split air conditioner.

[0080] The readable storage medium of the present invention implements the control method of the multi-split air conditioner of any technical solution of the present invention. Therefore, it has all the beneficial effects of the control method of the multi-split air conditioner of any technical solution of the present invention, which will not be repeated here.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method of a multi VRF air conditioner, characterized by, In the case that the multi-split air conditioner is provided with multiple outdoor units and multiple electronic expansion valves, the control method comprises: In the case that it is determined that the multi-split air conditioner has a lack of refrigerant fault, the multi-split air conditioner is controlled to perform a reset operation, and an interval time M of the reset is recorded; comparing the interval time M with a first time threshold M 阈1 to obtain a first comparison result; According to the first comparison result, it is determined whether the multi-split air conditioner continues to run; The reset operation comprises: controlling an electronic expansion valve of a first outdoor unit to open to a maximum opening degree and last for a time q, the first outdoor unit being an outdoor unit that has not run for a time Q. The determination of whether the multi-split air conditioner continues to run specifically comprises: According to the interval time M, an average interval time M is obtained 均 ; comparing the average interval time M 均 with a first time threshold M 阈1 ; In the average interval time M 均 greater than or equal to the first time threshold M 阈1 If yes, it is judged that the multi-connected air conditioner can continue to run. Wherein, M 均 = , n is the reset number of the multi-split air conditioner; In the case that it is determined that the multi-split air conditioner can continue to run, the control method further comprises: In the case that the first outdoor unit is stopped, the multi-connected air conditioner is controlled to reset every M f time. The electronic expansion valve is controlled to open to a maximum opening degree, and the high pressure P and the outdoor ring temperature T of the multi-split air conditioner are obtained. comparing the high pressure pressure P with a first pressure threshold P 阈1 and a second pressure threshold P 阈2 comparing the outer ring temperature T with a first temperature threshold T 阈1 and a second temperature threshold T 阈2 resulting in a second comparison result; The second comparison result satisfies one of the following determination conditions, and the reset number is controlled to be cleared. The judgment condition comprises: the high-pressure pressure P is less than or equal to a first pressure threshold P 阈1 , and the outer ring temperature T is greater than or equal to a first temperature threshold T 阈1 , or said high pressure P is greater than said second pressure threshold P 阈2 less than said first pressure threshold P 阈1 and said outer ring temperature T is greater than said second temperature threshold T 阈2 less than said first temperature threshold T 阈1 or said high pressure P is less than or equal to said second pressure threshold P 阈2 and said outer ring temperature T is less than or equal to said second temperature threshold T 阈2 ; secondly, said M f is determined by said M 均 .

2. The control method according to claim 1, characterized by, Before the determination that the multi-split air conditioner has a lack of refrigerant fault, the control method further comprises: The reset number n of the multi-split air conditioner is recorded, and the reset number n is compared with a reset number threshold N. In the case that the reset number n is greater than the reset number threshold N, it is determined that the multi-split air conditioner has a lack of refrigerant fault.

3. The control method according to claim 1, characterized by, said average interval time M 均 is compared to a first time threshold M 阈1 the control method further comprises: In the M 均 If the first time threshold M 阈1 If the first time threshold M is less than the first time threshold M , the multi-split air conditioner cannot continue to operate, and the multi-split air conditioner is controlled to determine the cause of the failure that cannot continue to operate.

4. The control method according to claim 3, characterized by The control of the fault reason that the multi-split air conditioner cannot continue to run specifically comprises: comparing the average interval time M 均 with a second time threshold M 阈2 to obtain a third comparison result; According to the third comparison result, the fault reason that the multi-split air conditioner cannot continue to run is determined.

5. The control method according to claim 4, characterized by The determination of the fault reason that the multi-split air conditioner cannot continue to run according to the third comparison result specifically comprises: In the case that the average interval time M 均 is greater than or equal to the second time threshold M 阈2 , it is determined that the failure reason that the multi-split air conditioner cannot continue to run is that the outdoor unit part leaks. In the case where the average interval time M 均 is less than the second time threshold M 阈2 , it is determined that the failure reason that the multi-split air conditioner cannot continue to operate is lack of refrigerant.

6. A control device characterized by comprising: The control device can perform the control method of any one of claims 1-5, and specifically comprises: A determination module (110) that determines whether the multi-split air conditioner has a lack of refrigerant fault; A control module (120) that controls the multi-split air conditioner to perform a reset operation and continue to run; A recording module (130) that records an interval time M of the reset. a comparison module (140) configured to compare the interval time M with a first time threshold M 阈1 compare and obtain a first comparison result, and feed back the first comparison result to the judging module (110); The reset operation comprises: controlling an electronic expansion valve of a first outdoor unit to open to a maximum opening degree and last for a time q, the first outdoor unit being an outdoor unit that has not run for a time Q.

7. A multi-split air conditioner, characterized in that, The multi-split air conditioner performs the control method of any one of claims 1-5, and the multi-split air conditioner comprises: Multiple outdoor units (200); Multiple electronic expansion valves (210) provided in the multiple outdoor units (200).

8. A readable storage medium, characterized by, The readable storage medium comprises a stored computer program, wherein when the computer program is run by a processor, the device where the storage medium is located performs the control method of the multi-split air conditioner of any one of claims 1-5.

Images