Method and device for detecting refrigerant abnormality, air conditioner, and storage medium

Abstract

The present application relates to the field of smart home appliance technology. A method for detecting refrigerant anomalies is disclosed, which is applied to the heating operation of an air conditioner. It comprises: when the continuous operation time of the compressor is greater than or equal to the preset time, detecting the current indoor ambient temperature Tr, the current indoor coil temperature Tp, and the current outdoor ambient temperature To. When the air conditioner is a fixed-frequency model, the refrigerant circulation situation is analyzed based on Tr, Tp and the current state of the compressor. When the air conditioner is a variable-frequency model, the refrigerant circulation situation is analyzed based on Tr, Tp, To and the current state of the compressor. In the case of refrigerant circulation anomalies, a prompt message of the refrigerant circulation anomaly is output. This method improves the accuracy of refrigerant leakage detection in the heating state. The present application also discloses a device for detecting refrigerant anomalies, an air conditioner, and a storage medium.

Description

Technical Field

[0001] The present application relates to the technical field of smart home appliances, for example, to a method, device, air conditioner, and storage medium for detecting refrigerant anomalies. Background Art

[0002] Currently, air conditioner refrigerant anomalies are the most prominent and common problem reported in the after-sales service. These anomalies can cause system operation to become abnormal. This directly impacts the heating performance of the air conditioner, making it essential to detect refrigerant anomalies during operation.

[0003] To address the need for refrigerant anomaly detection during heating operation, a related technology discloses a method and system for determining refrigerant insufficiency in an air conditioner system. This technology utilizes the temperature difference between the inner coil and the inner ambient temperature during heating, the outer ambient temperature, and the inner wind speed, as well as a repeated determination scheme. This ensures that refrigerant insufficiency is effectively detected in all system usage scenarios, allowing for accurate detection and timely feedback of abnormal faults.

[0004] During the implementation of the disclosed embodiments, it was discovered that related art techniques, when detecting refrigerant anomalies under heating conditions, failed to consider the impact of different air conditioner models, different current indoor coil temperature ranges, different current outdoor ambient temperature ranges, and different compressor states on the refrigerant anomaly detection results under heating conditions. Therefore, while related art techniques can detect refrigerant anomalies under heating conditions, the detection methods are insensitive, prone to misjudgment, and result in low refrigerant anomaly detection accuracy. Summary of the Invention

[0005] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0006] Embodiments of the present disclosure provide a method, an apparatus, an air conditioner, and a storage medium for detecting refrigerant anomaly, so as to improve the accuracy of refrigerant anomaly detection in heating operation conditions.

[0007] In some embodiments, the method includes: when the continuous operation time of the compressor is greater than or equal to the preset time, detecting the current indoor ambient temperature Tr, the current indoor coil temperature Tp, and the current outdoor ambient temperature To; when the air conditioner is a fixed-frequency model, analyzing the refrigerant circulation situation based on Tr, Tp and the current state of the compressor; or, when the air conditioner is a variable-frequency model, analyzing the refrigerant circulation situation based on Tr, Tp, To and the current state of the compressor; in the case of refrigerant circulation abnormality, outputting a prompt message of refrigerant circulation abnormality.

[0008] In the above embodiment, when the continuous operation time of the compressor is greater than or equal to the preset time, logical analysis is performed on different models of air conditioners respectively. In the case of a fixed-frequency air conditioner, the current heat exchange amount of the air conditioner is determined based on Tr and Tp, and the current state of the compressor is combined to eliminate possible misjudgments during the detection process. In the case of a variable-frequency air conditioner, the current heat exchange amount of the air conditioner is determined based on Tr and Tp, and the current state of the compressor is determined based on Tr and To. By combining the heat exchange amount with the current state of the compressor for judgment and analysis, possible misjudgments during the detection process are eliminated. This detection method is sensitive and reliable, can reduce the probability of misjudgment, and improve the accuracy of refrigerant anomaly detection in heating operation conditions.

[0009] Optionally, the refrigerant circulation condition is analyzed based on Tr, Tp, and the current state of the compressor, including: if Tp meets the conditions for starting a defrost operation, and Tp-Tr≤T1, and the compressor starts a defrost operation, and, during the defrost operation, |Tr-Tp|≤T1, then determining that the refrigerant circulation is abnormal, where T1 is a first temperature threshold.

[0010] Optionally, the refrigerant circulation situation is analyzed based on Tr, Tp and the current state of the compressor, including: if Tr and Tp meet the conditions for compressor overheat protection or temperature shutdown, and the compressor is not in overheat protection or temperature shutdown state, it is determined that the refrigerant circulation is abnormal.

[0011] Optionally, Tp satisfies the conditions for starting the defrost operation, including: Tp<Tep; wherein Tep is a coil temperature threshold.

[0012] Optionally, Tr and Tp satisfy the conditions for compressor overheat protection or temperature-reaching shutdown, including: Tp ≥ Tep, and Tp-Tr ≤ T2, where T2 is the second temperature threshold.

[0013] Optionally, T1<T2, and T1 and T2 are determined according to Tp.

[0014] Optionally, determining T1 and T2 according to Tp includes: determining T1 and T2 corresponding to Tp according to a preset corresponding relationship.

[0015] Optionally, analyzing the refrigerant circulation situation based on Tr, Tp and the current state of the compressor also includes: if Tp meets the conditions for starting the defrost operation, and Tp-Tr>T1, and the compressor starts the defrost operation, and, during the defrost operation, |Tr-Tp|>T1, then it is determined that the refrigerant circulation is normal.

[0016] Optionally, the refrigerant circulation condition is analyzed based on Tr, Tp, To, and the current state of the compressor, including: if Tr, Tp, and To meet the conditions for starting a defrost operation, and Tp-Tr≤T3, and the compressor starts a defrost operation, and, during the defrost operation, |Tr-Tp|≤T3, then determining that the refrigerant circulation is abnormal, where T3 is a third temperature threshold.

[0017] Optionally, the refrigerant circulation situation is analyzed based on Tr, Tp, To and the current state of the compressor, including: if Tr, Tp and To meet the conditions for starting defrost operation, and Tp-Tr≤T3, and the compressor has not started defrost operation, and the current outdoor coil temperature is equal to the initial outdoor coil temperature, then it is determined that the refrigerant circulation is abnormal.

[0018] Optionally, the refrigerant circulation situation is analyzed based on Tr, Tp, To and the current state of the compressor, including: if Tr, Tp and To meet the conditions for compressor overheating protection or temperature shutdown, and the compressor is not in overheating protection or temperature shutdown state, it is determined that the refrigerant circulation is abnormal.

[0019] Optionally, Tr, Tp, and To satisfy the conditions for starting the defrosting operation, including: Tr>T4, and T5≤To<T6, wherein T4 is the fourth temperature threshold, T5 is the fifth temperature threshold, and T6 is the sixth temperature threshold.

[0020] Optionally, Tr, Tp, and To satisfy the conditions for compressor overheat protection or temperature shutdown, including: Tr>T4, and To≥T6, and Tp-Tr≤T7, where T7 is the seventh temperature threshold.

[0021] Optionally, T3<T7, and T3 and T7 are determined according to To.

[0022] Optionally, determining T3 and T7 according to To includes: determining T3 and T7 corresponding to To according to a preset corresponding relationship.

[0023] Optionally, analyzing the refrigerant circulation situation based on Tr, Tp, To and the current state of the compressor also includes: if Tr, Tp and To meet the conditions for starting the defrost operation, and Tr-Tp>T3, and the compressor starts the defrost operation, and, during the defrost operation, |Tr-Tp|>T3, then it is determined that the refrigerant circulation is normal.

[0024] Optionally, analyzing the refrigerant circulation situation based on Tr, Tp, To and the current state of the compressor also includes: if Tr, Tp and To meet the conditions for starting the defrost operation, and Tr-Tp>T3, and the compressor has not started the defrost operation, and the current outdoor coil temperature is not equal to the initial coil temperature, then it is determined that the refrigerant circulation is normal.

[0025] Optionally, in the event of an abnormal refrigerant circulation, the method further includes: controlling the compressor to stop; controlling the external fan to stop; and controlling the internal fan to keep running.

[0026] Optionally, after controlling the compressor to stop, it also includes: when the cumulative number of compressor shutdowns is less than a preset value, controlling the compressor to restart; when the cumulative number of compressor shutdowns is greater than or equal to a preset value, keeping the compressor in a shutdown state.

[0027] In some embodiments, the device is applied to the heating operation condition of the air conditioner, and includes: a processor and a memory storing program instructions, and the processor is configured to execute the above-mentioned method for detecting refrigerant abnormality when running the program instructions.

[0028] In some embodiments, the air conditioner includes a compressor and a heat exchanger, and also includes the device for detecting refrigerant abnormality as described above.

[0029] In some embodiments, the storage medium stores program instructions, and when the program instructions are run, the method for detecting refrigerant anomalies as described above is executed.

[0030] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0032] Figure 1 It is a structural diagram of an air conditioner;

[0033] Figure 2 is a schematic diagram of a method for detecting refrigerant anomaly provided by an embodiment of the present disclosure;

[0034] Figure 3 is a schematic diagram of another method for detecting refrigerant abnormality provided by an embodiment of the present disclosure;

[0035] Figure 4 is a schematic diagram of another method for detecting refrigerant abnormality provided by an embodiment of the present disclosure;

[0036] Figure 5 is a schematic diagram of another method for detecting refrigerant abnormality provided by an embodiment of the present disclosure;

[0037] Figure 6is a schematic diagram of another method for detecting refrigerant abnormality provided by an embodiment of the present disclosure;

[0038] Figure 7 is a schematic diagram of another method for detecting refrigerant abnormality provided by an embodiment of the present disclosure;

[0039] Figure 8 Schematic diagram of a device for detecting refrigerant anomalies provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0041] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0042] Unless otherwise stated, the term "plurality" means two or more.

[0043] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0044] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0045] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0047] Currently, air conditioner refrigerant anomalies are the most prominent and common problem reported in after-sales service. When an air conditioner refrigerant anomaly occurs, the system will operate abnormally, directly affecting the heating effect of the air conditioner. Therefore, detecting refrigerant anomalies during air conditioner operation is essential. To address the need for detecting refrigerant anomalies during heating operation, related art discloses a method for determining refrigerant insufficiency in an air conditioner system and an air conditioner. The method comprises: using the temperature difference between the internal coil and the internal ambient temperature during heating, the external ambient temperature, and the internal wind speed control, as well as repeated judgment schemes, to effectively reflect the characteristics of refrigerant insufficiency in all system usage scenarios, accurately determine the abnormal fault, and promptly report the abnormal fault. However, when detecting refrigerant anomalies during heating operation, the related art fails to consider the impact of different air conditioner models, different current indoor coil temperature ranges, different current outdoor ambient temperature ranges, and different compressor states on the refrigerant anomaly detection results during heating operation. Consequently, the detection method is insensitive, prone to misjudgment, and has a low refrigerant anomaly detection accuracy.

[0048] like Figure 1 As shown, an air conditioner typically includes a circulation circuit. The circulation circuit includes a compressor 11, an outdoor heat exchanger 12, a throttling device 13, an indoor heat exchanger 14, and a four-way valve 15. The air conditioner also includes an electronic control device (not shown) that controls the operation of the circulation circuit. The electronic control device includes a processor. The processor is used to control the compressor, adjust the throttling device 13, and other electronically controlled components, thereby realizing various functions of the air conditioner.

[0049] Embodiments of the present disclosure provide a method and apparatus for detecting refrigerant anomaly, an air conditioner, and a storage medium to improve the accuracy of refrigerant anomaly detection under heating operation conditions.

[0050] Combine Figure 1 The embodiment of the present disclosure provides a method for detecting refrigerant abnormality in the air conditioner. The method is applied to a fixed-frequency air conditioner. Figure 2 As shown, the method includes:

[0051] S201 : When the compressor continuously operates for a period greater than or equal to a preset period, the processor detects the current indoor ambient temperature Tr and the current indoor coil temperature Tp.

[0052] Here, Tr and Tp can be detected respectively by a plurality of temperature sensors provided in the air conditioner.

[0053] The temperature sensor used to detect Tr is installed at the air inlet of the air conditioner indoor unit, making the detected Tr more accurate. The temperature sensor used to detect Tp is installed at the coil position of the air conditioner indoor unit. The real-time temperature detected by the temperature sensor is used as Tp.

[0054] When the compressor continuously operates for a preset duration, it indicates that the air conditioner has been operating in heating mode for a period of time and has entered a stable state. The temperature sensor also enters a stable operating state, and the detected Tr and Tp values ​​are relatively stable. Optionally, if the preset duration is greater than or equal to 20 minutes (min), the detected Tr and Tp values ​​are even more stable and reliable.

[0055] S202: The processor analyzes the refrigerant circulation status according to Tr, Tp and the current state of the compressor.

[0056] When the air conditioner is a fixed-frequency model and is operating in heating mode, the processor can accurately analyze the refrigerant circulation situation based on the temperature anomalies shown by Tp and Tr in this case, combined with the current state of the compressor.

[0057] S203: When the refrigerant circulation is abnormal, the processor outputs a prompt message indicating the refrigerant circulation is abnormal.

[0058] In the above embodiment, when the compressor continuously operates for a predetermined duration or longer, a logical analysis is performed on the fixed-frequency air conditioner. The current heat exchange rate of the air conditioner is determined based on Tr and Tp, and the current state of the compressor is also considered to eliminate potential misjudgments during the detection process. This sensitive and reliable detection method can reduce the probability of misjudgments and improve the accuracy of refrigerant anomaly detection during heating operation.

[0059] Optionally, the processor outputting the prompt information of the refrigerant circulation abnormality includes: prompting the refrigerant circulation abnormality through an indicator light, for example, the indicator light flashes, or the indicator light displays a specific color.

[0060] Optionally, the processor outputs a prompt indicating a refrigerant circulation anomaly by displaying a preset time for the refrigerant circulation anomaly fault code on the display screen; or directly displaying the preset time for the refrigerant anomaly on the display screen. Following the prompt, the fault information is recorded in a memory. More specifically, the preset time is 3 to 6 minutes. This ensures more stable judgment results and provides timely and intuitive feedback to the user regarding the refrigerant circulation anomaly.

[0061] Optionally, the processor analyzes the refrigerant circulation situation based on Tr, Tp and the current state of the compressor, including: if Tp meets the conditions for starting the defrost operation, and Tp-Tr≤T1, and the compressor starts the defrost operation, and, during the defrost operation, |Tr-Tp|≤T1, then it is determined that the refrigerant circulation is abnormal.

[0062] Among them, T1 is the first temperature threshold. It should be noted that the set T1 should not be too large or too small. Optionally, T1 can be but is not limited to between 2°C and 4°C. More specifically, T1 is 2°C, 3°C or 4°C. If T1 is set too large, the difference between Tp and Tr and the absolute value of the difference may be less than or equal to T1, but this does not mean that the current heat exchange capacity of the air conditioner is low. In this case, the air conditioner may not have a refrigerant circulation abnormality, which is prone to misjudgment. If T1 is set too small, it is difficult to detect the difference between Tp and Tr, that is, it is difficult to detect a refrigerant circulation abnormality. Therefore, setting T1 within this temperature range can better realize the detection of refrigerant circulation abnormalities, and neither misjudgment nor missed detection will occur when the refrigerant circulation is abnormal, thereby ensuring the accuracy of the refrigerant circulation abnormality detection results.

[0063] If the refrigerant circulation is normal, the difference between Tp and Tr will be large when the air conditioner meets the conditions for starting defrost operation during heating operation. In addition, the compressor may start defrosting. When defrosting is started, the absolute value of the difference between Tp and Tr will also be large during defrost operation.

[0064] When the conditions for starting the defrost operation are met under the heating operation of the air conditioner, if the difference between Tp and Tr is small, and the compressor starts defrosting, and the absolute value of the difference between Tp and Tr during the defrost operation is also small, it can be determined that the air conditioner has a refrigerant circulation abnormality.

[0065] Optionally, the refrigerant circulation situation is analyzed based on Tr, Tp and the current state of the compressor, including: if Tr and Tp meet the conditions for compressor overheat protection or temperature shutdown, and the compressor is not in overheat protection or temperature shutdown state, it is determined that the refrigerant circulation is abnormal.

[0066] If the refrigerant circulation is normal, when the conditions for compressor overheat protection or temperature shutdown are met under the heating operation condition of the air conditioner, the compressor is in the state of overheat protection or temperature shutdown.

[0067] When the conditions for compressor overheat protection or temperature shutdown are met under the heating operation condition of the air conditioner, if the compressor is not in the overheat protection state or the temperature shutdown state, it can be determined that the air conditioner has a refrigerant circulation abnormality.

[0068] Optionally, Tp satisfies the conditions for starting the defrost operation, including: Tp<Tep.

[0069] Tep is the coil temperature threshold. More specifically, 30°C ≤ Tep ≤ 40°C. This allows for more accurate judgment of the compressor's current status based on Tep.

[0070] When the air conditioner is in heating operation, when Tp < Tep, it indicates that Tp is low. When Tp is low, it can be determined that the conditions for starting defrost operation are met.

[0071] Optionally, Tr and Tp satisfy the conditions for compressor overheat protection or temperature shutdown, including: Tp ≥ Tep, and Tp-Tr ≤ T2, where Tep is the coil temperature threshold.

[0072] Among them, T2 is the second temperature threshold. It should be noted that the set T2 should not be too large or too small. Optionally, T2 can be but is not limited to between 5°C and 7°C. More specifically, T2 is 5°C, 6°C or 7°C. If T1 is set too large, the difference between Tp and Tr may be less than or equal to T2, but this does not mean that the current heat exchange capacity of the air conditioner is low. In this case, the air conditioner may not have a refrigerant circulation abnormality, which is prone to misjudgment. If T2 is set too small, it is difficult to detect the difference between Tp and Tr, that is, it is difficult to detect a refrigerant circulation abnormality. Therefore, setting T2 within this temperature range can better realize the detection of refrigerant circulation abnormalities, and neither misjudgment nor missed detection will occur when the refrigerant circulation is abnormal, thereby ensuring the accuracy of the refrigerant circulation abnormality detection results.

[0073] When the air conditioner is operating in heating mode, if Tp ≥ Tep, it indicates that Tp is high. When Tp is high and the difference between Tp and Tr is small, it indicates that the air conditioner's heat exchange efficiency is poor. This indicates that the compressor may be in overheat protection or temperature shutdown.

[0074] Optionally, T1<T2, and T1 and T2 are determined according to Tp.

[0075] The difference between Tp and Tr varies when Tp is within different temperature ranges. A higher Tp indicates better heat exchange during heating operation, and the greater the difference between Tp and Tr. Determining the values ​​of T1 and T2 based on Tp, and setting T1 and T2 separately when Tp is within different temperature ranges, can make the test results more accurate and sensitive.

[0076] Optionally, the processor determines T1 and T2 according to Tp, including: determining T1 and T2 corresponding to Tp according to a preset corresponding relationship.

[0077] More specifically, Table 1 shows an optional correspondence between Tp and T1. Table 2 shows an optional correspondence between Tp and T2.

[0078] Table 1

[0079] Tp(℃) T1(℃) 28≤Tp<30 4 26≤Tp<28 3 24≤Tp<26 2

[0080] Table 2

[0081] Tp(℃) T2(℃) 34≤Tp<36 7 32≤Tp<34 6 30≤Tp<32 5

[0082] Optionally, analyzing the refrigerant circulation situation based on Tr, Tp and the current state of the compressor also includes: if Tp meets the conditions for starting the defrost operation, and Tp-Tr>T1, and the compressor starts the defrost operation, and, during the defrost operation, |Tr-Tp|>T1, then it is determined that the refrigerant circulation is normal.

[0083] When the conditions for starting defrost operation are met under the heating operation condition of the air conditioner, if the difference between Tp and Tr is large, and the compressor starts defrosting, and the absolute value of the difference between Tp and Tr during defrost operation is also large, it indicates that the current air conditioner has a high heat exchange capacity and a good heat exchange effect, and it can be determined that the refrigerant circulation of the air conditioner is normal.

[0084] Combine Figure 3 As shown, the embodiment of the present disclosure provides another method for detecting refrigerant anomalies. The method is applied to a fixed-frequency air conditioner and includes:

[0085] S301 : When the compressor continuously operates for a period greater than or equal to a preset period, the processor detects the current indoor ambient temperature Tr and the current indoor coil temperature Tp.

[0086] S302: The processor analyzes the refrigerant circulation status according to Tr, Tp and the current state of the compressor.

[0087] S303: When the refrigerant circulation is abnormal, the processor outputs a prompt message indicating the refrigerant circulation is abnormal.

[0088] S304, the processor controls the compressor to stop; the processor controls the external fan to stop; and the processor controls the internal fan to keep running.

[0089] When it is determined that the refrigerant circulation is abnormal, the processor controls the compressor and the outdoor fan to stop, which can ensure that the air conditioner operates in a stable and safe environment and avoid the refrigerant circulation abnormality problem from becoming more serious due to the continued flow of refrigerant. For example, in the case of a refrigerant leak, controlling the compressor and the outdoor fan to stop can avoid the pollution of the refrigerant leak to the environment and save energy. The processor controls to keep the indoor fan running, which can enable the air conditioner to maintain the heating effect by running the indoor fan when the compressor and outdoor fan are stopped. Therefore, it avoids the refrigerant circulation abnormality from having a significant impact on the indoor heating effect and affecting the user experience.

[0090] S305: After the compressor is controlled to stop, the processor determines whether the cumulative number of compressor shutdowns is less than a preset value. If so, the process proceeds to S306; if not, the process proceeds to S307.

[0091] S306: The processor controls the compressor to restart.

[0092] S307: The processor keeps the compressor in a stopped state.

[0093] To further confirm that the air conditioner has a refrigerant circulation anomaly, the system can be restarted and repeated until the cumulative number of compressor shutdowns exceeds or equals a preset value. A high number of refrigerant circulation anomalies based on these conditions indicates a high likelihood of a refrigerant circulation anomaly. This allows for multiple refrigerant circulation anomaly detections, resulting in more accurate and reliable results. If the test results confirm a refrigerant circulation anomaly, the compressor should remain shut down to prevent further aggravation of the anomaly due to continued refrigerant flow. Following the prompt, the fault information is recorded in memory for easy after-sales repair.

[0094] More specifically, the preset value can be set according to actual needs. When the requirements for refrigerant circulation abnormality detection are relatively strict, the preset value can be set to 3 times, 2 times or less; when the requirements for refrigerant circulation abnormality detection are not particularly strict, the preset value can be set to 4 times, 5 times or more. When more refrigerant circulation abnormalities occur, the compressor is kept in a stopped state.

[0095] Combine Figure 4 As shown, the embodiment of the present disclosure provides another method for detecting refrigerant anomalies. The method is applied to a fixed-frequency air conditioner and includes:

[0096] S401 : When the compressor continuously operates for 20 minutes or longer, the processor detects the current indoor ambient temperature Tr and the current indoor coil temperature Tp.

[0097] S402: The processor analyzes the refrigerant circulation status according to Tr, Tp and the current state of the compressor.

[0098] S403, Tp < 30 ° C, and Tp-Tr ≤ 3 ° C, and the compressor starts the defrost operation, and during the defrost operation, |Tr-Tp| ≤ 3 ° C, the processor determines that the refrigerant circulation is abnormal.

[0099] S404, Tp ≥ 30 ° C, and Tp-Tr ≤ 5 ° C, and the compressor is not in overheat protection or temperature shutdown state, the processor determines that the refrigerant circulation is abnormal.

[0100] S405: When the refrigerant circulation is abnormal, the processor outputs a prompt message indicating the refrigerant circulation is abnormal.

[0101] S406, the processor controls the compressor to stop; the processor controls the external fan to stop; and the processor controls the internal fan to keep running.

[0102] S407: After the compressor is controlled to stop, the processor determines whether the cumulative number of compressor shutdowns is less than 3. If so, the process proceeds to S408; if not, the process proceeds to S409.

[0103] S408: The processor controls the compressor to restart.

[0104] S409: The processor keeps the compressor in a stopped state.

[0105] In the above embodiment, when the compressor continuously operates for 20 minutes or longer, the detected Tr and Tp are more stable and accurate, and the refrigerant anomaly detection result for the fixed-frequency air conditioner is also more accurate.

[0106] Based on Tp < 30°C, determine whether the compressor has started defrosting. Based on Tp-Tr ≤ 3°C, and |Tr-Tp| ≤ 3°C during defrosting operation, determine that the current air conditioner has a poor heat exchange effect, and then determine that the refrigerant circulation is abnormal. Based on Tp ≥ 30°C, and Tp-Tr ≤ 5°C, determine that the compressor may be in overheating protection or temperature-reaching shutdown state. In the case where the compressor may be in overheating protection or temperature-reaching shutdown state, the compressor is not in overheating protection or temperature-reaching shutdown state, and then determine that the refrigerant circulation is abnormal. This embodiment eliminates the possibility of misjudgment during the detection process.

[0107] In addition, the system checks whether the cumulative number of compressor shutdowns is less than three to further confirm that a refrigerant circulation anomaly exists in the air conditioner. If this is less than three, the system repeats the above determination until the cumulative number of compressor shutdowns reaches three or more. This sensitive and reliable method reduces the probability of false positives and improves the accuracy of refrigerant anomaly detection during heating operation.

[0108] Combine Figure 1 The present disclosure provides another method for detecting refrigerant anomalies in the air conditioner. The method is applied to variable frequency air conditioners. Figure 5 As shown, the method includes:

[0109] S501: When the compressor continuously operates for a period greater than or equal to a preset period, the processor detects the current indoor ambient temperature Tr, the current indoor coil temperature Tp, and the current outdoor ambient temperature To.

[0110] Among them, the temperature sensor for detecting To is set on the outside of the outdoor heat exchanger of the air conditioner to detect the current outdoor ambient temperature in real time.

[0111] S502: The processor analyzes the refrigerant circulation status according to Tr, Tp, To and the current state of the compressor.

[0112] When the air conditioner is a variable frequency model and is running in heating mode, the processor can accurately analyze the refrigerant circulation situation based on the temperature abnormalities shown by Tp and Tr in this case, combined with the current state of the compressor analyzed based on Tr and To.

[0113] S503: When the refrigerant circulation is abnormal, the processor outputs a prompt message indicating the refrigerant circulation is abnormal.

[0114] In the above embodiment, when the compressor continuously operates for a predetermined duration or longer, a logical analysis is performed on the variable-frequency air conditioner. The current heat exchange rate is determined based on Tr and Tp, while the current compressor status is determined based on Tr and To. By combining the heat exchange rate with the current compressor status, false positives can be eliminated during the detection process. This sensitive and reliable detection method can reduce the probability of false positives and improve the accuracy of refrigerant anomaly detection during heating operation.

[0115] Optionally, the refrigerant circulation situation is analyzed based on Tr, Tp, To and the current state of the compressor, including: if Tr, Tp and To meet the conditions for starting the defrost operation, and Tp-Tr≤T3, and the compressor starts the defrost operation, and during the defrost operation, |Tr-Tp|≤T3, then it is determined that the refrigerant circulation is abnormal.

[0116] Among them, T3 is the third temperature threshold. It should be noted that the set T3 should not be too large or too small. Optionally, T3 can be but is not limited to between 2°C and 4°C. More specifically, T2 is 2°C, 3°C or 4°C. If T3 is set too large, the difference between Tp and Tr and the absolute value of the difference may be less than or equal to T3, but this does not mean that the current heat exchange capacity of the air conditioner is low. In this case, the air conditioner may not have a refrigerant circulation abnormality, which is prone to misjudgment. If T3 is set too small, it is difficult to detect the difference between Tp and Tr, that is, it is difficult to detect a refrigerant circulation abnormality. Therefore, setting T3 within this temperature range can better realize the detection of refrigerant circulation abnormalities, and neither misjudgment nor missed detection will occur when the refrigerant circulation is abnormal, thereby ensuring the accuracy of the refrigerant circulation abnormality detection results.

[0117] If the refrigerant circulation is normal, the difference between Tp and Tr will be large when the air conditioner meets the conditions for starting defrost operation during heating operation. In addition, the compressor may start defrosting. When defrosting is started, the absolute value of the difference between Tp and Tr will also be large during defrost operation.

[0118] When the conditions for starting the defrost operation are met under the heating operation of the air conditioner, if the difference between Tp and Tr is small, and the compressor starts defrosting, and the absolute value of the difference between Tp and Tr during the defrost operation is also small, it can be determined that the air conditioner has a refrigerant circulation abnormality.

[0119] Optionally, the refrigerant circulation situation is analyzed based on Tr, Tp, To and the current state of the compressor, including: if Tr, Tp and To meet the conditions for starting defrost operation, and Tp-Tr≤T3, and the compressor has not started defrost operation, and the current outdoor coil temperature is equal to the initial outdoor coil temperature, then it is determined that the refrigerant circulation is abnormal.

[0120] If the refrigerant circulation is normal, the difference between Tp and Tr will be significant when the air conditioner meets the defrost start conditions during heating operation. Furthermore, the compressor may not start defrosting. If defrosting is not started, the current outdoor coil temperature will not be equal to the initial outdoor coil temperature.

[0121] When the air conditioner is operating in heating mode and meets the conditions for initiating defrost, if the difference between Tp and Tr is small, the compressor has not yet started defrosting, and the current outdoor coil temperature is equal to the initial outdoor coil temperature, a refrigerant circulation abnormality can be determined. For variable-frequency air conditioners, the current outdoor coil temperature is more stable. Therefore, using both the current and initial outdoor coil temperatures for judgment can provide a more accurate result.

[0122] Optionally, the refrigerant circulation situation is analyzed based on Tr, Tp, To and the current state of the compressor, including: if Tr, Tp and To meet the conditions for compressor overheating protection or temperature shutdown, and the compressor is not in overheating protection or temperature shutdown state, it is determined that the refrigerant circulation is abnormal.

[0123] If the refrigerant circulation is normal, when the conditions for compressor overheat protection or temperature shutdown are met under the heating operation condition of the air conditioner, the compressor is in the state of overheat protection or temperature shutdown.

[0124] When the conditions for compressor overheat protection or temperature shutdown are met under the heating operation condition of the air conditioner, if the compressor is not in the overheat protection state or the temperature shutdown state, it can be determined that the air conditioner has a refrigerant circulation abnormality.

[0125] Optionally, Tr, Tp, and To satisfy the conditions for starting the defrost operation, including: Tr>T4, and T5≤To<T6.

[0126] T4 is the fourth temperature threshold. It should be noted that T4 should not be set too low. Optionally, T4 ≥ 5°C. More specifically, T4 is 5°C, 6°C, or 7°C. If T4 is set less than 5°C, for example, setting T4 to 4°C, it will affect the judgment of the current state of the compressor. Therefore, setting T4 ≥ 5°C can make detection more accurate within this temperature range.

[0127] T5 is the fifth temperature threshold, and T6 is the sixth temperature threshold. Optionally, T5 ≥ -5°C and T6 ≥ 10°C. More specifically, T5 is -5°C, -4°C, or -3°C; and T6 is 10°C, 11°C, or 12°C. When To is between -5°C and 10°C, it's easier to intuitively determine whether the compressor has entered defrost mode.

[0128] When the air conditioner is in heating operation, when Tr>T4 and To is low, it can be determined that the conditions for starting the defrost operation are met.

[0129] Optionally, Tr, Tp and To meet the conditions for compressor overheat protection or temperature shutdown, including: Tr>T4, and To≥T6, and Tp-Tr≤T7.

[0130] Among them, T7 is the seventh temperature threshold. It should be noted that the set T7 should not be too large or too small. Optionally, T7 can be but not limited to between 5°C and 7°C. More specifically, T2 is 5°C, 6°C or 7°C. If T7 is set too large, the difference between Tp and Tr may be less than or equal to T7, but this does not mean that the current heat exchange capacity of the air conditioner is low. In this case, the air conditioner may not have a refrigerant circulation abnormality, which is prone to misjudgment. If T7 is set too small, it is difficult to detect the difference between Tp and Tr, that is, it is difficult to detect a refrigerant circulation abnormality. Therefore, setting T7 within this temperature range can better realize the detection of refrigerant circulation abnormalities, and neither misjudgment nor missed detection will occur when the refrigerant circulation is abnormal, thereby ensuring the accuracy of the refrigerant circulation abnormality detection results.

[0131] When the air conditioner is operating in heating mode and Tr > T4, To is high, and the difference between Tp and Tr is small, it indicates that the air conditioner's heat exchange efficiency is poor. This indicates that the compressor may be in overheat protection or temperature shutdown mode.

[0132] Optionally, T3<T7, and T3 and T7 are determined according to To.

[0133] The difference between Tp and Tr varies when To is within different temperature ranges. A higher To indicates better heat exchange performance during heating operation, and the greater the difference between Tp and Tr. Determining the values ​​of T3 and T7 based on To, and setting T3 and T7 separately for different To temperature ranges, can result in more accurate and sensitive test results.

[0134] Optionally, the processor determines T3 and T7 according to To, including: the processor determines T3 and T7 corresponding to To according to a preset corresponding relationship.

[0135] More specifically, Table 3 shows an optional correspondence between To and T3. Table 4 shows an optional correspondence between To and T7.

[0136] Table 3

[0137] To(℃) T3(℃) 5≤To<10 4 0≤To<5 3 -5≤To<0 2

[0138] Table 4

[0139] To(℃) T7(℃) 30≤To<25 7 20≤To<15 6 15≤To<10 5

[0140] Optionally, analyzing the refrigerant circulation situation based on Tr, Tp, To and the current state of the compressor also includes: if Tr, Tp and To meet the conditions for starting the defrost operation, and Tr-Tp>T3, and the compressor starts the defrost operation, and, during the defrost operation, |Tr-Tp|>T3, then it is determined that the refrigerant circulation is normal.

[0141] When the conditions for starting defrost operation are met under the heating operation condition of the air conditioner, if the difference between Tp and Tr is large, and the compressor starts defrosting, and the absolute value of the difference between Tp and Tr during defrost operation is also large, it indicates that the current air conditioner has a high heat exchange capacity and a good heat exchange effect, and it can be determined that the refrigerant circulation of the air conditioner is normal.

[0142] Optionally, analyzing the refrigerant circulation situation based on Tr, Tp, To and the current state of the compressor also includes: if Tr, Tp and To meet the conditions for starting the defrost operation, and Tr-Tp>T3, and the compressor has not started the defrost operation, and the current outdoor coil temperature is not equal to the initial outdoor coil temperature, then it is determined that the refrigerant circulation is normal.

[0143] When the conditions for starting defrost operation are met under the heating operation condition of the air conditioner, if the difference between Tp and Tr is large, the compressor does not start defrosting, and the current outdoor coil temperature is not equal to the initial outdoor coil temperature, it indicates that the current air conditioner heat exchange capacity is high and the heat exchange effect is good, then it can be determined that the air conditioner refrigerant circulation is normal.

[0144] Combine Figure 6 As shown, the embodiment of the present disclosure provides another method for detecting refrigerant anomalies. The method is applied to a variable frequency air conditioner and includes:

[0145] S601: When the compressor continuously operates for a period greater than or equal to a preset period, the processor detects the current indoor ambient temperature Tr, the current indoor coil temperature Tp, and the current outdoor ambient temperature To.

[0146] S602: The processor analyzes the refrigerant circulation status based on Tr, Tp, To and the current state of the compressor.

[0147] S603: When the refrigerant circulation is abnormal, the processor outputs a prompt message indicating the refrigerant circulation is abnormal.

[0148] S604, the processor controls the compressor to stop; the processor controls the external fan to stop; and the processor controls the internal fan to keep running.

[0149] When it is determined that the refrigerant circulation is abnormal, the processor controls the compressor and the outdoor fan to stop, which can ensure that the air conditioner operates in a stable and safe environment and avoid the refrigerant circulation abnormality problem from becoming more serious due to the continued flow of refrigerant. For example, in the case of a refrigerant leak, controlling the compressor and the outdoor fan to stop can avoid the pollution of the refrigerant leak to the environment and save energy. The processor controls to keep the indoor fan running, which can enable the air conditioner to maintain the heating effect by running the indoor fan when the compressor and outdoor fan are stopped. Therefore, it avoids the refrigerant circulation abnormality from having a significant impact on the indoor heating effect and affecting the user experience.

[0150] S605: After the compressor is controlled to stop, the processor determines whether the cumulative number of compressor stop times is less than a preset value. If so, the process proceeds to S606; if not, the process proceeds to S607.

[0151] S606: The processor controls the compressor to restart.

[0152] S607: The processor keeps the compressor in a stopped state.

[0153] To further confirm that the air conditioner has a refrigerant circulation anomaly, the system can be restarted and repeated until the cumulative number of compressor shutdowns exceeds or equals a preset value. A high number of refrigerant circulation anomalies based on these conditions indicates a high likelihood of a refrigerant circulation anomaly. This allows for multiple refrigerant circulation anomaly detections, resulting in more accurate and reliable results. If the test results confirm a refrigerant circulation anomaly, the compressor should remain shut down to prevent further aggravation of the anomaly due to continued refrigerant flow. Following the prompt, the fault information is recorded in memory for easy after-sales repair.

[0154] More specifically, the preset value can be set according to actual needs. When the requirements for refrigerant circulation abnormality detection are relatively strict, the preset value can be set to 3 times, 2 times or less; when the requirements for refrigerant circulation abnormality detection are not particularly strict, the preset value can be set to 4 times, 5 times or more. When more refrigerant circulation abnormalities occur, the compressor is kept in a stopped state.

[0155] Combine Figure 7 As shown, the embodiment of the present disclosure provides another method for detecting refrigerant anomalies. The method is applied to a variable frequency air conditioner and includes:

[0156] S701: When the compressor continuously operates for 20 minutes or longer, the processor detects the current indoor ambient temperature Tr, the current indoor coil temperature Tp, and the current outdoor ambient temperature To.

[0157] S702: The processor analyzes the refrigerant circulation status based on Tr, Tp, To and the current state of the compressor.

[0158] S703, Tr>5℃, and -5℃≤To<10℃, and Tp-Tr≤3℃, and the compressor starts defrosting operation, and during defrosting operation, |Tr-Tp|≤3℃, the processor determines that the refrigerant circulation is abnormal.

[0159] S704, Tr>5℃, and -5℃≤To<10℃, and Tp-Tr≤3℃, and the compressor has not started defrosting, and the current outdoor coil temperature is equal to the initial outdoor coil temperature, the processor determines that the refrigerant circulation is abnormal.

[0160] S705, Tr>5℃, and To≥10℃, and Tp-Tr≤5℃, and the compressor is not in overheat protection or temperature shutdown state, the processor determines that the refrigerant circulation is abnormal.

[0161] S706: When the refrigerant circulation is abnormal, the processor outputs a prompt message indicating the refrigerant circulation is abnormal.

[0162] S707, the processor controls the compressor to stop; the processor controls the external fan to stop; the processor controls the internal fan to keep running.

[0163] S708: After the compressor is controlled to stop, the processor determines whether the cumulative number of compressor shutdowns is less than 3. If so, the process proceeds to S709; if not, the process proceeds to S710.

[0164] S709: The processor controls the compressor to restart.

[0165] S710: The processor keeps the compressor in a stopped state.

[0166] In the above embodiment, when the compressor continuously operates for 20 minutes or longer, the detected Tr, Tp, and To are more stable and accurate, and the refrigerant anomaly detection result of the variable frequency air conditioner is also more accurate.

[0167] Based on Tr>5°C and -5°C≤To<10°C, determine whether the compressor has started defrosting. If defrosting is started, based on Tp-Tr≤3°C and |Tr-Tp|≤3°C during defrosting, determine that the current air conditioner's heat exchange effect is poor, and thus determine that a refrigerant circulation abnormality exists. If defrosting is not started, based on Tp-Tr≤3°C and the current outdoor coil temperature is equal to the initial outdoor coil temperature, determine that the current air conditioner's heat exchange effect is poor, and thus determine that a refrigerant circulation abnormality exists. Based on Tr>5°C and To≥10°C and Tp-Tr≤5°C, determine that the compressor may be in overheat protection or temperature shutdown state. In the case where the compressor may be in overheat protection or temperature shutdown state, if the compressor is not in overheat protection or temperature shutdown state, then determine that a refrigerant circulation abnormality exists. This embodiment eliminates possible misjudgments during the detection process.

[0168] In addition, the system checks whether the cumulative number of compressor shutdowns is less than three to further confirm that a refrigerant circulation anomaly exists in the air conditioner. If this is less than three, the system repeats the above determination until the cumulative number of compressor shutdowns reaches three or more. This sensitive and reliable method reduces the probability of false positives and improves the accuracy of refrigerant anomaly detection during heating operation.

[0169] Combine Figure 8 , an embodiment of the present disclosure provides a device for detecting refrigerant abnormality, including a processor (processor) 800 and a memory (memory) 801. Optionally, the device for detecting refrigerant abnormality may also include a communication interface (Communication Interface) 802 and a bus 803. Among them, the processor 800, the communication interface 802, and the memory 801 can communicate with each other through the bus 803. The communication interface 802 can be used for information transmission. The processor 800 can call the logic instructions in the memory 801 to execute the method for detecting refrigerant abnormality of the above embodiment.

[0170] In addition, the logic instructions in the memory 801 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0171] Memory 801, as a storage medium, can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the methods in the embodiments of the present disclosure. Processor 800 executes the program instructions / modules stored in memory 801 to perform functional applications and data processing, thereby implementing the method for detecting refrigerant anomalies in the above-described embodiments.

[0172] The memory 801 may include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated based on the use of the terminal device. Furthermore, the memory 801 may include high-speed random access memory and non-volatile memory.

[0173] An embodiment of the present disclosure provides an air conditioner, comprising the above-mentioned device for detecting refrigerant abnormality.

[0174] An embodiment of the present disclosure provides a storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned method for detecting refrigerant abnormality.

[0175] The aforementioned storage medium may be a transient computer-readable storage medium or a non-transient computer-readable storage medium. Non-transient storage media include various media that can store program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks. These media may also be transient storage media.

[0176] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible variations. Unless explicitly required, separate components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include plural forms. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variations "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups of these. In the absence of further restrictions, an element defined by the sentence "comprising a..." does not exclude the presence of other identical elements in the process, method or device that includes the element. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments can be referenced to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can be found in the description of the method part.

[0177] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. The technicians will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0178] The flowcharts and block diagrams in the accompanying drawings show the possible implementation architectures, functions and operations of the systems, methods and computer program products according to the embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, program segment or part of the code, and the module, program segment or part of the code contains one or more executable instructions for implementing the specified logical functions. In some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in an order different from that disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified function or action, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for detecting refrigerant anomaly, applied to the heating operation of an air conditioner, characterized in that: include: When the compressor continuously operates for a time period greater than or equal to a preset time period, the current indoor ambient temperature Tr, the current indoor coil temperature Tp, and the current outdoor ambient temperature To are detected; In the case where the air conditioner is a fixed-frequency model, the refrigerant circulation situation is analyzed based on Tr, Tp and the current state of the compressor, wherein the analysis of the refrigerant circulation situation based on Tr, Tp and the current state of the compressor includes: if Tp meets the conditions for starting the defrost operation, and Tp-Tr≤T1, and the compressor starts the defrost operation, and, during the defrost operation, |Tr-Tp|≤T1, then it is determined that the refrigerant circulation is abnormal; wherein T1 is a first temperature threshold; T1 is determined based on Tp; or, In the case where the air conditioner is a variable frequency model, the refrigerant circulation situation is analyzed based on Tr, Tp, To and the current state of the compressor; wherein, the refrigerant circulation situation is analyzed based on Tr, Tp, To and the current state of the compressor, including: if Tr, Tp and To meet the conditions for starting the defrost operation, and Tp-Tr≤T3, and the compressor starts the defrost operation, and, during the defrost operation, |Tr-Tp|≤T3, it is determined that the refrigerant circulation is abnormal; wherein T3 is the third temperature threshold; T3 is determined based on To; in the case of refrigerant circulation abnormality, a prompt message of the refrigerant circulation abnormality is output.

2. The method according to claim 1, characterized in that Analyze the refrigerant circulation based on Tr, Tp and the current status of the compressor, including: If Tr and Tp meet the conditions for compressor overheat protection or temperature shutdown, and the compressor is not in overheat protection or temperature shutdown state, it is determined that the refrigerant circulation is abnormal.

3. The method according to claim 1, characterized in that Tp meets the conditions for starting defrost operation, including: Tp<Tep; Where Tep is the coil temperature threshold.

4. The method according to claim 2, characterized in that Tr and Tp meet the conditions for compressor overheat protection or temperature shutdown, including: Tp ≥ Tep, and Tp-Tr ≤ T2; Wherein, Tep is the coil temperature threshold, and T2 is the second temperature threshold.

5. The method according to claim 1, wherein Analyze the refrigerant circulation based on Tr, Tp, To and the current status of the compressor, including: If Tr, Tp, and To meet the conditions for starting the defrost operation, and Tp-Tr≤T3, and the compressor does not start the defrost operation, and the current outdoor coil temperature is equal to the initial outdoor coil temperature, it is determined that the refrigerant circulation is abnormal; and / or If Tr, Tp, and To meet the conditions for compressor overheat protection or temperature shutdown, and the compressor is not in overheat protection or temperature shutdown state, it is determined that the refrigerant circulation is abnormal.

6. The method according to claim 1, characterized in that Tr, Tp, and To meet the conditions for starting defrost operation, including: Tr>T4,and T5≤To<T6; Among them, T4 is the fourth temperature threshold, T5 is the fifth temperature threshold, and T6 is the sixth temperature threshold.

7. The method according to claim 5, characterized in that Tr, Tp, and To meet the conditions for compressor overheat protection or temperature shutdown, including: Tr>T4, and To≥T6, and Tp-Tr≤T7; Among them, T4 is the fourth temperature threshold, T5 is the fifth temperature threshold, T6 is the sixth temperature threshold, and T7 is the seventh temperature threshold.

8. The method according to any one of claims 1 to 7, characterized in that In the event of refrigerant circulation abnormality, the method further includes: Control compressor shutdown; Control the shutdown of the external fan; Control the internal fan to keep running.

9. A device for detecting refrigerant anomalies, used in the heating operation of an air conditioner, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the method for detecting refrigerant abnormality according to any one of claims 1 to 8 when running the program instructions.

10. An air conditioner comprising a compressor and a heat exchanger, characterized in that: It also includes the device for detecting refrigerant abnormality as described in claim 9.

11. A storage medium storing program instructions, characterized in that: When the program instructions are executed, the method for detecting refrigerant abnormality according to any one of claims 1 to 8 is executed.

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