Refrigerant leakage detection method, device, air conditioner and storage medium

Abstract

The present invention relates to the technical field of air conditioners, and discloses a refrigerant leakage detection method, device, air conditioner and storage medium. The method comprises: when the exhaust temperature of the air conditioner is greater than a preset exhaust temperature, and the target operating exhaust parameter of the air conditioner exceeds the preset refrigerant leakage exhaust parameter range, obtaining the exhaust temperature of the air conditioner at each moment in a preset time period; determining the exhaust temperature extreme value of the air conditioner and the exhaust time corresponding to the exhaust temperature extreme value according to the exhaust temperature at each moment; obtaining the exhaust cycle of the air conditioner according to the exhaust time; determining whether there is a refrigerant leakage in the air conditioner based on the exhaust cycle, thereby obtaining a precise exhaust cycle by determining the exhaust temperature extreme value of the air conditioner and the corresponding exhaust time, thereby reducing refrigerant leakage false alarms based on the precise exhaust cycle, and improving the accuracy of refrigerant leakage detection.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a refrigerant leakage detection method, device, air conditioner and storage medium. Background Art

[0002] At present, there are generally two types of detection methods used for refrigerant leakage detection of air conditioners. One is to add a certain component to the refrigerant or refrigerant and detect the concentration of this component to determine whether the refrigerant is leaking. The other is to detect exhaust, return air, pressure and other parameters after a certain period of operation to determine whether there is a refrigerant leak.

[0003] However, when the above two detection methods are used for refrigerant detection, if components are added to the refrigerant, the heat exchange characteristics will be affected, and special equipment is required for detection, which is costly. If the exhaust gas, return gas, pressure and other parameters are detected, the exhaust gas, return gas, pressure and other parameters will fluctuate with the various frequency limit values ​​triggered by the refrigerant leakage, and this fluctuation period is uncertain, which affects the accuracy of the refrigerant leakage detection. Summary of the invention

[0004] The present invention provides a refrigerant leakage detection method, device, air conditioner and storage medium, aiming to solve the technical problem that the current air conditioner operating parameters will fluctuate with various frequency limit values ​​triggered by refrigerant leakage, thereby affecting the accuracy of refrigerant leakage detection.

[0005] To achieve the above object, the present invention provides a refrigerant leakage detection method, the method comprising:

[0006] When the exhaust temperature of the air conditioner is greater than the preset exhaust temperature and the target operating exhaust parameter of the air conditioner exceeds the preset refrigerant leakage exhaust parameter range, obtaining the exhaust temperature of the air conditioner at each moment in the preset time period;

[0007] Determining the exhaust temperature extreme value of the air conditioner and the exhaust time corresponding to the exhaust temperature extreme value according to the exhaust temperature at each moment;

[0008] Acquire the exhaust cycle of the air conditioner according to the exhaust time;

[0009] It is determined whether there is a refrigerant leak in the air conditioner based on the exhaust cycle.

[0010] Optionally, the step of determining the exhaust temperature extreme value of the air conditioner according to the exhaust temperature at each moment comprises:

[0011] Determine the exhaust gas difference between the exhaust gas temperatures at two adjacent moments;

[0012] The exhaust temperature extreme value of the air conditioner is determined according to the exhaust difference.

[0013] Optionally, the step of determining whether there is a refrigerant leak in the air conditioner based on the exhaust cycle further includes:

[0014] When the exhaust cycle of the exhaust temperature is less than a preset exhaust cycle, it is determined that there is a primary refrigerant leakage in the air conditioner;

[0015] When the exhaust cycle of the exhaust temperature is greater than or equal to a preset exhaust cycle, it is determined that there is a secondary refrigerant leakage in the air conditioner.

[0016] Optionally, after the step of determining whether the air conditioner has a secondary refrigerant leakage, the method further includes:

[0017] The operating frequency of the compressor of the air conditioner is reduced, and the opening degree of the outdoor electronic expansion valve of the air conditioner is increased.

[0018] Optionally, after the step of reducing the operating frequency of the compressor of the air conditioner and increasing the opening of the outdoor electronic expansion valve of the air conditioner, the method further comprises:

[0019] Controlling the air conditioner to restart and obtaining target operating exhaust parameters of the air conditioner;

[0020] When it is detected that the target operating exhaust parameter exceeds a preset parameter range for refrigerant leakage detection, the compressor of the air conditioner is controlled to stop, and a refrigerant leakage prompt message is output.

[0021] Optionally, after the step of obtaining the target operating exhaust parameters of the air conditioner, the method further includes:

[0022] When it is detected that the target operating exhaust parameter does not exceed the preset parameter range of refrigerant leakage detection, the operating frequency of the compressor of the air conditioner is reduced, and the opening degree of the outdoor electronic expansion valve of the air conditioner is increased.

[0023] Optionally, after the step of determining whether the air conditioner has a primary refrigerant leakage, the method further includes:

[0024] The compressor of the air conditioner is controlled to stop, and a refrigerant leakage prompt message is output.

[0025] Optionally, when the exhaust temperature of the air conditioner is greater than a preset exhaust temperature and the target operating exhaust parameter of the air conditioner exceeds a preset refrigerant leakage exhaust parameter range, the step of obtaining the exhaust temperature of the air conditioner at each moment in a preset time period further includes:

[0026] When the exhaust temperature of the air conditioner is greater than a preset exhaust temperature, adjusting the operating state of the air conditioner, and obtaining a target operating exhaust parameter when the air conditioner operates in the adjusted operating state;

[0027] When the target operating exhaust parameter of the air conditioner exceeds a preset refrigerant leakage exhaust parameter range, the exhaust temperature of the air conditioner at each moment in a preset time period is obtained.

[0028] In addition, in order to achieve the above-mentioned purpose, the present invention also provides a refrigerant leakage detection device, the refrigerant leakage detection device comprising:

[0029] A first acquisition module, for acquiring the exhaust temperature of the air conditioner at each moment in a preset time period when the exhaust temperature of the air conditioner is greater than a preset exhaust temperature and the target operating exhaust parameter of the air conditioner exceeds a preset refrigerant leakage exhaust parameter range;

[0030] A first determination module, for determining an exhaust temperature extreme value of the air conditioner and an exhaust time corresponding to the exhaust temperature extreme value according to the exhaust temperature at each moment;

[0031] A second acquisition module, used for acquiring an exhaust cycle of the air conditioner according to the exhaust time;

[0032] The second determination module is used to determine whether there is a refrigerant leak in the air conditioner based on the exhaust cycle.

[0033] In addition, to achieve the above-mentioned purpose, the present invention also provides an air conditioner, which includes a processor, a memory and a refrigerant leakage detection program stored in the memory. When the refrigerant leakage detection program is executed by the processor, the steps of the refrigerant leakage detection method as described above are implemented.

[0034] In addition, to achieve the above-mentioned purpose, the present invention also provides a computer storage medium, on which a refrigerant leakage detection program is stored, and when the refrigerant leakage detection program is executed by a processor, the steps of the refrigerant leakage detection method described above are implemented.

[0035] Compared with the prior art, the present invention provides a refrigerant leakage detection method, which obtains the exhaust temperature of the air conditioner at each moment in a preset time period when the exhaust temperature of the air conditioner is greater than a preset exhaust temperature and the target operating exhaust parameter of the air conditioner exceeds the preset refrigerant leakage exhaust parameter range; determines the exhaust temperature extreme value of the air conditioner and the exhaust time corresponding to the exhaust temperature extreme value according to the exhaust temperature at each moment; obtains the exhaust cycle of the air conditioner according to the exhaust time; determines whether there is a refrigerant leakage in the air conditioner based on the exhaust cycle, thereby obtaining a precise exhaust cycle by determining the exhaust temperature extreme value of the air conditioner and the corresponding exhaust time, thereby reducing false alarms of refrigerant leakage based on the precise exhaust cycle, and improving the accuracy of refrigerant leakage detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1is a schematic diagram of the hardware structure of the air conditioner involved in each embodiment of the present invention;

[0037] Figure 2 It is a flow chart of a first embodiment of the refrigerant leakage detection method of the present invention;

[0038] Figure 3 is another schematic flow chart of the first embodiment of the refrigerant leakage detection method of the present invention;

[0039] Figure 4 is a flow chart of a second embodiment of a refrigerant leakage detection method of the present invention;

[0040] Figure 5 is a schematic flow chart of a third embodiment of a refrigerant leakage detection method of the present invention;

[0041] Figure 6 It is a functional module schematic diagram of an embodiment of a refrigerant leakage detection device of the present invention.

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0044] Reference Figure 1 , Figure 1 1 is a schematic diagram of the hardware structure of the air conditioner involved in each embodiment of the present invention. In the embodiment of the present invention, the air conditioner may include a processor 1001 (such as a central processing unit 35ntr1l Pro35ssin7 Unit, 3PU), a communication bus 1002, an input port 1003, an output port 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components; the input port 1003 is used for data input; the output port 1004 is used for data output, and the memory 1005 can be a high-speed R1M memory or a stable memory (non-vol1til5 m5mory), such as a disk memory. The memory 1005 can optionally be a storage device independent of the aforementioned processor 1001. Those skilled in the art can understand that Figure 1 The hardware structure shown in the figure does not constitute a limitation of the present invention, and may include more or less components than those shown in the figure, or combine certain components, or arrange the components differently.

[0045] Continue to refer to Figure 1 , Figure 1 The memory 1005 as a readable storage medium may include an operating system, a network communication module, an application module, and a refrigerant leakage detection program. Figure 1 In the terminal shown, the network interface 1004 is mainly used to connect to the background server and communicate data with the background server; the user interface 1003 is mainly used to connect to the client (user end) and communicate data with the client; and the processor 1001 can be used to call the refrigerant leakage detection program stored in the memory 1005.

[0046] In this embodiment, the refrigerant leakage detection device includes: a memory 1005, a processor 1001, and a refrigerant leakage detection program stored in the memory 1005 and executable on the processor 1001, wherein the processor 1001 calls the refrigerant leakage detection program stored in the memory 1005 and performs the following operations:

[0047] When the exhaust temperature of the air conditioner is greater than the preset exhaust temperature and the target operating exhaust parameter of the air conditioner exceeds the preset refrigerant leakage exhaust parameter range, obtaining the exhaust temperature of the air conditioner at each moment in the preset time period;

[0048] Determining the exhaust temperature extreme value of the air conditioner and the exhaust time corresponding to the exhaust temperature extreme value according to the exhaust temperature at each moment;

[0049] Acquire the exhaust cycle of the air conditioner according to the exhaust time;

[0050] It is determined whether there is a refrigerant leak in the air conditioner based on the exhaust cycle.

[0051] based on Figure 1 The hardware structure shown in FIG. 1 is a first embodiment of the present invention which provides a refrigerant leakage detection method. Figure 2 , Figure 2 Schematic diagram of the process of the first embodiment of the refrigerant leakage detection method of the present invention.

[0052] The embodiment of the present invention provides an embodiment of a refrigerant leakage detection method. It should be noted that although a logical sequence is shown in the flow chart, in some cases, the steps shown or described may be performed in an order different from that shown here.

[0053] Specifically, refer to Figure 2 , the refrigerant leakage detection method of this embodiment includes:

[0054] Step S10: when the exhaust temperature of the air conditioner is greater than a preset exhaust temperature and the target operating exhaust parameter of the air conditioner exceeds a preset refrigerant leakage exhaust parameter range, obtaining the exhaust temperature of the air conditioner at each moment in a preset time period;

[0055] Specifically, in this embodiment, the above-mentioned preset exhaust temperature refers to the temperature used to measure whether the exhaust temperature is abnormal when performing exhaust detection, wherein the preset exhaust temperature can be a specific exhaust temperature threshold preset by the user. When it is detected that the current exhaust temperature exceeds a specific exhaust temperature threshold preset by the user, it indicates that the exhaust temperature of the air conditioner exceeds the exhaust temperature during normal operation of the air conditioner, and then it is determined that the air conditioner needs to perform refrigerant leakage protection, such as automatically activating the refrigerant leakage protection module to perform refrigerant leakage protection. In addition, since the performance parameters of each air conditioner and the operating conditions of the air conditioner under each operating parameter are different, if a specific exhaust temperature threshold is used, it may cause inaccurate exhaust detection, thereby affecting inaccurate refrigerant leakage detection. Therefore, in this embodiment, the exhaust temperature threshold can also be flexibly set for the air conditioner according to the current operating parameters, thereby improving the accuracy of exhaust detection, wherein the operating parameters can be any parameters that can affect the exhaust temperature, such as compression ratio, refrigerant flow rate, electronic expansion valve opening, etc., and this embodiment does not limit this.

[0056] In addition, in order to avoid damage to the compressor of the air conditioner, in the present embodiment, when it is detected that the exhaust temperature of the air conditioner is greater than the preset exhaust temperature, the operating state of the air conditioner is adjusted. Specifically, in the present embodiment, the air conditioner is first controlled to shut down, and then after detecting that the exhaust temperature of the air conditioner is within the normal exhaust temperature range, the air conditioner is controlled to start running. Thus, by controlling the air conditioner to restart, damage to the air conditioner compressor is avoided, and when the air conditioner starts running, the outdoor and indoor fans of the air conditioner are controlled to run at the highest speed, thereby completing the adjustment of the operating state of the air conditioner.

[0057] Then, after the outdoor and indoor fans of the air conditioner have been running at the highest speed for a certain period of time, the target operating exhaust parameters of the air conditioner when it is running in the adjusted operating state are obtained, so as to avoid the problem of inaccurate detection results caused by fluctuations in operating parameters such as exhaust temperature due to unstable operation of the air conditioner in the early stage of the air conditioner restart. It should also be noted that in this embodiment, the exhaust temperature of the air conditioner and the ambient temperature of the environment in which the air conditioner is located are changed by adjusting the operating state of the air conditioner. If the target operating exhaust parameters are detected again to exceed the preset refrigerant leakage exhaust parameter range after the exhaust temperature of the air conditioner and the ambient temperature of the environment in which the air conditioner is located have changed, it can be determined that the air conditioner has a refrigerant leakage, thereby reducing the misjudgment rate of refrigerant leakage.

[0058] Furthermore, in this embodiment, when the target operating exhaust parameters of the air conditioner exceed the preset refrigerant leakage exhaust parameter range, the exhaust temperature of the air conditioner at each moment in a preset time period is obtained, and the level of refrigerant leakage is determined by the exhaust temperature at each moment, thereby improving the accuracy of refrigerant leakage contact.

[0059] In addition, it should be noted that the above-mentioned target operating exhaust parameters refer to the exhaust temperature of the compressor and the operating current of the air conditioner. In this embodiment, the exhaust temperature of the compressor and the operating current of the air conditioner are detected to detect whether the air conditioner needs to trigger the refrigerant leakage detection function. In other words, in this embodiment, when the exhaust temperature is detected to be greater than the exhaust temperature threshold and the operating current is less than the operating current threshold, that is, when it exceeds the above-mentioned preset refrigerant leakage exhaust parameter range, it indicates that the air conditioner is operating abnormally, and it is determined that there is a refrigerant leakage in the air conditioner, that is, the air conditioner needs to trigger the refrigerant leakage detection function. Otherwise, it indicates that the air conditioner is operating normally, and it is determined that the air conditioner does not need to trigger the refrigerant leakage detection function.

[0060] When it is detected that the air conditioner needs to trigger the refrigerant leakage detection function, the preset refrigerant leakage detection process is executed, that is, the exhaust temperature at each moment in the preset time period is first obtained, and the preset refrigerant leakage detection process is completed through the exhaust temperature at each moment.

[0061] In this embodiment, when acquiring the exhaust temperature at each moment, a timed acquisition method is adopted, wherein the timing can be started after detecting that the above parameters exceed the preset refrigerant leakage exhaust parameter range. In addition, the timing can also be started after detecting that the exhaust temperature is greater than the preset exhaust temperature. For example, after detecting that the exhaust temperature is greater than the preset exhaust temperature, the exhaust temperature of the compressor and the operating current of the air conditioner are detected every 1 second. When it is detected that the exhaust temperature is greater than the exhaust temperature threshold and the operating current is less than the operating current threshold, the refrigerant leakage detection function is triggered, and the current exhaust temperature of the air conditioner continues to be acquired, and the timing continues to be accumulated, for example, at the i-th second, and then the exhaust temperature at the (i+1)th second, the (i+2)th second, and so on. The time interval for the timed acquisition can be any time, and this embodiment does not limit this.

[0062] Step S20: determining the exhaust temperature extreme value of the air conditioner and the exhaust time corresponding to the exhaust temperature extreme value according to the exhaust temperature at each time;

[0063] Step S30: acquiring the exhaust cycle of the air conditioner according to the exhaust time;

[0064] Specifically, the above-mentioned exhaust temperature extreme value refers to the highest exhaust temperature or the lowest exhaust temperature within the exhaust temperature fluctuation period. For example, the exhaust temperature detected at 152s is 123°C, the exhaust temperature detected at 153s is 124°C, the exhaust temperature detected at 152s is 123°C, and the exhaust temperature detected at 152s is 122°C, then 124°C is the highest exhaust temperature.

[0065] In this embodiment, after obtaining the exhaust temperature at each moment, the above-mentioned exhaust temperature extreme value can be determined according to the exhaust difference between the exhaust temperatures at two adjacent moments, for example, the difference between the exhaust temperature at the (i+1)th second and the exhaust temperature at the i-th second is determined, so as to find the highest exhaust temperature or the lowest exhaust temperature and the corresponding exhaust time. Specifically, after obtaining the exhaust temperature at each moment, if the exhaust difference between two adjacent moments obtained for the first time is greater than zero, the exhaust difference between the exhaust temperatures at two subsequent adjacent moments is continuously obtained until the exhaust difference is equal to zero or less than zero, thereby obtaining the highest exhaust temperature and determining the exhaust time corresponding to the highest exhaust temperature; if the exhaust difference between two adjacent moments obtained for the first time is less than zero, the exhaust difference between the exhaust temperatures at two subsequent adjacent moments is continuously obtained until the exhaust difference is equal to zero or greater than zero, thereby obtaining the lowest exhaust temperature and determining the exhaust time corresponding to the highest exhaust temperature.

[0066] For ease of understanding, the above steps are illustrated here with an example. For example, when the exhaust temperature detected at the 152th second is 123°C and the exhaust temperature detected at the 153th second is 124°C, the exhaust difference between the 153th second and the 152th second is calculated to be 1°C. Then, the exhaust temperature detected at the 154th second is 126°C, and the exhaust difference between the 153th second and the 152th second is calculated to be 2°C. Then, the exhaust temperature detected at the 155th second is 125°C, and the exhaust difference between the 153th second and the 152th second is calculated to be (-1)°C, indicating that the highest exhaust temperature within the exhaust temperature fluctuation period is 126°C, and the corresponding exhaust time is the 154th second.

[0067] It should also be noted that in this embodiment, at least two maximum exhaust temperatures or minimum exhaust temperatures need to be obtained to obtain the exhaust cycle. The maximum exhaust temperature is used as an example. When the exhaust difference obtained for the first time is greater than zero, the exhaust difference between the exhaust temperatures at two subsequent adjacent moments continues to be obtained until the exhaust difference is equal to zero or less than zero, thereby obtaining the first maximum exhaust temperature, and determining the first exhaust moment corresponding to the first maximum exhaust temperature. Then, the above steps are continued to be executed in a loop, that is, after obtaining the first maximum exhaust temperature, the exhaust difference between the exhaust temperatures at two subsequent adjacent moments continues to be obtained until the second maximum exhaust temperature is obtained according to the exhaust difference, and determining the second exhaust moment corresponding to the second maximum exhaust temperature. It should also be noted that since the exhaust temperature is flexible and variable, the maximum exhaust temperature and the minimum exhaust temperature in each exhaust cycle are not fixed values. Therefore, in this embodiment, the temperature values ​​of the first maximum exhaust temperature and the second maximum exhaust temperature may be the same or different. Finally, the time difference between the first exhaust moment and the second exhaust moment is calculated to obtain the exhaust cycle.

[0068] In addition, in this embodiment, in addition to determining the exhaust temperature extreme value based on the exhaust difference, the exhaust temperature trend change curve of the air conditioner can also be generated according to the exhaust temperature at each moment, so as to determine the exhaust temperature extreme value based on the exhaust temperature trend change curve. This embodiment will not be repeated here.

[0069] Step S40: determining whether there is refrigerant leakage in the air conditioner based on the exhaust cycle.

[0070] In this embodiment, the above exhaust cycle can be used to reduce false alarms of refrigerant leakage types, thereby improving the accuracy of refrigerant leakage.

[0071] Specifically, refer to Figure 3 In this embodiment, the above step S40 specifically further includes:

[0072] Step S401: when the exhaust cycle of the exhaust temperature is less than a preset exhaust cycle, it is determined that there is a primary refrigerant leakage in the air conditioner;

[0073] Step S402: When the exhaust cycle of the exhaust temperature is greater than or equal to a preset exhaust cycle, it is determined that there is a secondary refrigerant leakage in the air conditioner.

[0074] It should be noted that the secondary refrigerant leakage means that the current air conditioner may have a slight refrigerant leakage. Therefore, if the air conditioner has a secondary refrigerant leakage, the air conditioner operating parameters can be adjusted to allow the air conditioner to still have a certain cooling or heating effect, thereby not affecting the normal use of the air conditioner; and the first-level refrigerant leakage means that the current air conditioner has a relatively serious refrigerant leakage and will affect the normal operation of the air conditioner. Therefore, if the air conditioner has a first-level refrigerant leakage, the air conditioner compressor needs to be immediately controlled to shut down to protect the compressor and other equipment. In addition, a refrigerant leakage prompt message can also be output to remind the user that the air conditioner has a refrigerant leakage failure.

[0075] It should be understood that the above is only an example and does not constitute any limitation to the technical solution of the present invention. Those skilled in the art can make settings based on needs in actual applications, and they are not listed one by one here.

[0076] In this embodiment, after detecting that the air conditioner needs to trigger the refrigerant leakage detection function, the exhaust temperature of the air conditioner at each time is obtained to determine the exhaust temperature extreme value of the air conditioner and its corresponding exhaust time, thereby determining the exhaust cycle, and then detecting refrigerant leakage through the exhaust cycle. By determining the exhaust temperature extreme value of the air conditioner and its corresponding exhaust time, an accurate exhaust cycle can be obtained, and then based on the accurate exhaust cycle, false alarms of refrigerant leakage are reduced, thereby improving the accuracy of refrigerant leakage detection.

[0077] Further, based on the first embodiment of the refrigerant leakage detection method of the present invention, a second embodiment of the refrigerant leakage detection method of the present invention is proposed.

[0078] Referring to Figure 3 , Figure 3 is a schematic flow chart of the second embodiment of the refrigerant leakage detection method of the present invention;

[0079] The difference between the second embodiment and the first embodiment is that after the step S402, the following steps are further included:

[0080] Step S50: Reduce the operating frequency of the compressor of the air conditioner and increase the opening degree of the outdoor electronic expansion valve of the air conditioner.

[0081] In this embodiment, when it is detected that the exhaust cycle of the air conditioner is relatively large, it indicates that the current refrigerant leakage situation is not very serious, that is, the current refrigerant leakage basically does not affect the normal operation of the air conditioner. Therefore, by adjusting the operating parameters of the air conditioner, the air conditioner can still have a certain cooling or heating effect, and thus does not affect the normal use of the air conditioner.

[0082] It should be noted that in this embodiment, when adjusting the operating frequency and the opening degree of the electronic expansion valve of the air conditioner, in order to reduce the operating load of the air conditioner, the operating frequency can be directly reduced to a pre-set first operating frequency, or the opening degree of the electronic expansion valve can be directly increased to a pre-set first opening degree.

[0083] In addition, in order to maintain the stability of the indoor temperature and avoid too large adjustment ranges of the operating frequency and the opening degree of the electronic expansion valve of the air conditioner, which may cause too large fluctuations in the indoor temperature and affect the user's comfort, in this embodiment, the adjustment ranges of the operating frequency and the opening degree of the electronic expansion valve of the above-mentioned air conditioner can also be determined based on the temperature range where the current outdoor temperature is located. For example, the outdoor temperature is divided into three temperature ranges: a ≤ T < b, b ≤ T < c, c ≤ T ≤ d. Among them, when a ≤ T < b, the adjustment range of the operating frequency is -f1 (that is, reduce f1), and the adjustment range of the opening degree of the electronic expansion valve is P1 (that is, increase P1); when b ≤ T < c, the adjustment range of the operating frequency is -f2, and the adjustment range of the opening degree of the electronic expansion valve is P2; when c ≤ T ≤ d, the adjustment range of the operating frequency is -f3, and the adjustment range of the opening degree of the electronic expansion valve is P3, where f1 < f2 < f3, P1 < P2 < P3, that is, the higher the outdoor temperature, the greater the reduction range of the operating frequency of the air conditioner and the greater the increase range of the opening degree of the electronic expansion valve.

[0084] It should also be noted that, in order to ensure the normal operation of the air conditioner, under normal circumstances, the operating frequency of the air conditioner is set with a minimum limit operating frequency, and the opening of the electronic expansion valve is set with a maximum limit opening. Therefore, in this embodiment, when the operating frequency and the opening of the electronic expansion valve of the air conditioner are adjusted, when the reduced operating frequency is less than the minimum limit operating frequency, the air conditioner is controlled to operate at the minimum limit operating frequency, and when the increased electronic expansion valve opening is greater than the maximum limit opening, the air conditioner is controlled to operate at the maximum limit opening.

[0085] In order to avoid the failure to detect refrigerant leakage due to the small fluctuation amplitude of parameters such as the exhaust temperature triggered in the early stage of the refrigerant leakage, in this embodiment, after the operating frequency of the air conditioner and the opening of the electronic expansion valve are adjusted, the air conditioner is controlled to restart. Specifically, in this embodiment, the air conditioner is first controlled to shut down, and then after detecting that the exhaust temperature of the air conditioner is within the normal exhaust temperature range, the air conditioner is controlled to start running, and then the target operating exhaust parameters of the air conditioner are obtained. It should be noted that the above-mentioned target operating exhaust parameters refer to the exhaust temperature of the compressor and the operating current of the air conditioner. In this embodiment, the exhaust temperature of the compressor and the operating current of the air conditioner are detected to detect whether there is a relatively serious primary refrigerant leakage in the air conditioner. When it is detected that the exhaust temperature is greater than the exhaust temperature threshold and the operating current is less than the operating current threshold, that is, the target When the operating exhaust parameter exceeds the preset refrigerant leakage detection parameter range, it is determined that the air conditioner has a relatively serious primary refrigerant leakage. Therefore, in order to protect the compressor and other equipment of the air conditioner, the air conditioner compressor is controlled to shut down, and a refrigerant leakage prompt message is output based on the display screen of the air conditioner to prompt the user that the air conditioner needs to be repaired. Conversely, when it is detected that the target operating exhaust parameter does not exceed the preset refrigerant leakage detection parameter range, it is determined that the current air conditioner does not have a relatively serious primary refrigerant leakage, that is, the current refrigerant leakage basically does not affect the normal operation of the air conditioner. Therefore, the operating parameters of the air conditioner can be adjusted so that the air conditioner still has a certain cooling or heating effect, thereby not affecting the normal use of the air conditioner. Specifically, in this embodiment, the operating frequency of the air conditioner compressor is reduced and the opening of the air conditioner's outdoor electronic expansion valve is increased.

[0086] It should be noted that in this embodiment, when adjusting the operating frequency and the opening of the electronic expansion valve of the air conditioner, in order to reduce the operating load of the air conditioner, the operating frequency can be directly reduced to a preset second operating frequency, or the opening of the electronic expansion valve can be directly increased to a preset second opening, wherein the second operating frequency is less than the above-mentioned first operating frequency, and the second opening is greater than the above-mentioned first opening.

[0087] In addition, in order to maintain the stability of the indoor temperature and avoid excessive adjustment of the operating frequency of the air conditioner and the opening of the electronic expansion valve, which would cause excessive fluctuations in the indoor temperature and affect user comfort, in this embodiment, the adjustment range of the operating frequency of the air conditioner and the opening of the electronic expansion valve can also be determined based on the temperature range of the current outdoor temperature, and this embodiment does not impose any restrictions on this.

[0088] In this embodiment, when it is detected that the current refrigerant leakage is not too serious, that is, the current refrigerant leakage basically does not affect the normal operation of the air conditioner, the operating parameters of the air conditioner can be adjusted so that the air conditioner still has a certain cooling or heating effect, thereby not affecting the normal use of the air conditioner.

[0089] Furthermore, based on the first embodiment of the refrigerant leakage detection method of the present invention, a third embodiment of the refrigerant leakage detection method of the present invention is proposed.

[0090] Reference Figure 4 , Figure 4 It is a schematic flow chart of a third embodiment of a refrigerant leakage detection method of the present invention;

[0091] The third embodiment differs from the first embodiment in that, after step S401, the method further includes:

[0092] Step S60: Controlling the compressor of the air conditioner to stop, and outputting a refrigerant leakage prompt message.

[0093] In this embodiment, when it is detected that the exhaust cycle of the air conditioner is short, it indicates that the current refrigerant leakage is serious. In order to protect the compressor and other equipment of the air conditioner, the compressor must be immediately controlled to stop running, and a corresponding prompt message is output based on the display screen of the air conditioner to remind the user that the air conditioner needs to be repaired.

[0094] In addition, in order to prevent the user from restarting the air conditioner again and causing damage to the compressor and other equipment of the air conditioner, in this embodiment, the air conditioner protection module is automatically started after the compressor is controlled to stop running. That is, before the refrigerant leakage of the air conditioner is repaired, when the control instruction sent by the user is received, the operation corresponding to the control instruction is not executed, and the corresponding prompt message is output based on the display screen of the air conditioner again to indicate that the air conditioner has a fault and cannot operate normally.

[0095] In this embodiment, when a serious refrigerant leakage is detected, the compressor is immediately controlled to stop running to protect the compressor and other equipment of the air conditioner, and a corresponding prompt message is output based on the display screen of the air conditioner to remind the user that the air conditioner needs to be repaired.

[0096] In addition, this embodiment also provides a refrigerant leakage detection device. Figure 5 , Figure 5Schematic diagram of functional modules of a refrigerant leakage detection device according to an embodiment of the present invention.

[0097] Specifically, refer to Figure 5 , the refrigerant leakage detection device comprises:

[0098] The acquisition module 10 is used to acquire the exhaust temperature of the air conditioner at each moment in a preset time period when the exhaust temperature of the air conditioner is greater than a preset exhaust temperature and the target operation exhaust parameter of the air conditioner exceeds a preset refrigerant leakage exhaust parameter range;

[0099] Specifically, in this embodiment, the above-mentioned preset exhaust temperature refers to the temperature used to measure whether the exhaust temperature is abnormal when performing exhaust detection, wherein the preset exhaust temperature can be a specific exhaust temperature threshold preset by the user. When it is detected that the current exhaust temperature exceeds a specific exhaust temperature threshold preset by the user, it indicates that the exhaust temperature of the air conditioner exceeds the exhaust temperature during normal operation of the air conditioner, and then it is determined that the air conditioner needs to perform refrigerant leakage protection, such as automatically activating the refrigerant leakage protection module to perform refrigerant leakage protection. In addition, since the performance parameters of each air conditioner and the operating conditions of the air conditioner under each operating parameter are different, if a specific exhaust temperature threshold is used, it may cause inaccurate exhaust detection, thereby affecting inaccurate refrigerant leakage detection. Therefore, in this embodiment, the exhaust temperature threshold can also be flexibly set for the air conditioner according to the current operating parameters, thereby improving the accuracy of exhaust detection, wherein the operating parameters can be any parameters that can affect the exhaust temperature, such as compression ratio, refrigerant flow rate, electronic expansion valve opening, etc., and this embodiment does not limit this.

[0100] In addition, in order to avoid damage to the compressor of the air conditioner, in the present embodiment, when it is detected that the exhaust temperature of the air conditioner is greater than the preset exhaust temperature, the operating state of the air conditioner is adjusted. Specifically, in the present embodiment, the air conditioner is first controlled to shut down, and then after detecting that the exhaust temperature of the air conditioner is within the normal exhaust temperature range, the air conditioner is controlled to start running. Thus, by controlling the air conditioner to restart, damage to the air conditioner compressor is avoided, and when the air conditioner starts running, the outdoor and indoor fans of the air conditioner are controlled to run at the highest speed, thereby completing the adjustment of the operating state of the air conditioner.

[0101] Then, after the outdoor and indoor fans of the air conditioner have been running at the highest speed for a certain period of time, the target operating exhaust parameters of the air conditioner when it is running in the adjusted operating state are obtained, so as to avoid the problem of inaccurate detection results caused by fluctuations in operating parameters such as exhaust temperature due to unstable operation of the air conditioner in the early stage of the air conditioner restart. It should also be noted that in this embodiment, the exhaust temperature of the air conditioner and the ambient temperature of the environment in which the air conditioner is located are changed by adjusting the operating state of the air conditioner. If the target operating exhaust parameters are detected again to exceed the preset refrigerant leakage exhaust parameter range after the exhaust temperature of the air conditioner and the ambient temperature of the environment in which the air conditioner is located have changed, it can be determined that the air conditioner has a refrigerant leakage, thereby reducing the misjudgment rate of refrigerant leakage.

[0102] Furthermore, in this embodiment, when the target operating exhaust parameters of the air conditioner exceed the preset refrigerant leakage exhaust parameter range, the exhaust temperature of the air conditioner at each moment in a preset time period is obtained, and the level of refrigerant leakage is determined by the exhaust temperature at each moment, thereby improving the accuracy of refrigerant leakage contact.

[0103] In addition, it should be noted that the above-mentioned target operating exhaust parameters refer to the exhaust temperature of the compressor and the operating current of the air conditioner. In this embodiment, the exhaust temperature of the compressor and the operating current of the air conditioner are detected to detect whether the air conditioner needs to trigger the refrigerant leakage detection function. In other words, in this embodiment, when the exhaust temperature is detected to be greater than the exhaust temperature threshold and the operating current is less than the operating current threshold, that is, when it exceeds the above-mentioned preset refrigerant leakage exhaust parameter range, it indicates that the air conditioner is operating abnormally, and it is determined that there is a refrigerant leakage in the air conditioner, that is, the air conditioner needs to trigger the refrigerant leakage detection function. Otherwise, it indicates that the air conditioner is operating normally, and it is determined that the air conditioner does not need to trigger the refrigerant leakage detection function.

[0104] When it is detected that the air conditioner needs to trigger the refrigerant leakage detection function, the preset refrigerant leakage detection process is executed, that is, the exhaust temperature at each moment in the preset time period is first obtained, and the preset refrigerant leakage detection process is completed through the exhaust temperature at each moment.

[0105] In this embodiment, when acquiring the exhaust temperature at each moment, a timed acquisition method is adopted, wherein the timing can be started after detecting that the above parameters exceed the preset refrigerant leakage exhaust parameter range. In addition, the timing can also be started after detecting that the exhaust temperature is greater than the preset exhaust temperature. For example, after detecting that the exhaust temperature is greater than the preset exhaust temperature, the exhaust temperature of the compressor and the operating current of the air conditioner are detected every 1 second. When it is detected that the exhaust temperature is greater than the exhaust temperature threshold and the operating current is less than the operating current threshold, the refrigerant leakage detection function is triggered, and the current exhaust temperature of the air conditioner continues to be acquired, and the timing continues to be accumulated, for example, at the i-th second, and then the exhaust temperature at the (i+1)th second, the (i+2)th second, and so on. The time interval for the timed acquisition can be any time, and this embodiment does not limit this.

[0106] A first determination module 20, for determining an exhaust temperature extreme value of the air conditioner and an exhaust time corresponding to the exhaust temperature extreme value according to the exhaust temperature at each moment;

[0107] A second acquisition module 30, for acquiring an exhaust cycle of the air conditioner according to the exhaust time;

[0108] Specifically, the above-mentioned exhaust temperature extreme value refers to the highest exhaust temperature or the lowest exhaust temperature within the exhaust temperature fluctuation period. For example, the exhaust temperature detected at 152s is 123°C, the exhaust temperature detected at 153s is 124°C, the exhaust temperature detected at 152s is 123°C, and the exhaust temperature detected at 152s is 122°C, then 124°C is the highest exhaust temperature.

[0109] In this embodiment, after obtaining the exhaust temperature at each moment, the above-mentioned exhaust temperature extreme value can be determined according to the exhaust difference between the exhaust temperatures at two adjacent moments, for example, the difference between the exhaust temperature at the (i+1)th second and the exhaust temperature at the i-th second is determined, so as to find the highest exhaust temperature or the lowest exhaust temperature and the corresponding exhaust time. Specifically, after obtaining the exhaust temperature at each moment, if the exhaust difference between two adjacent moments obtained for the first time is greater than zero, the exhaust difference between the exhaust temperatures at two subsequent adjacent moments is continuously obtained until the exhaust difference is equal to zero or less than zero, thereby obtaining the highest exhaust temperature and determining the exhaust time corresponding to the highest exhaust temperature; if the exhaust difference between two adjacent moments obtained for the first time is less than zero, the exhaust difference between the exhaust temperatures at two subsequent adjacent moments is continuously obtained until the exhaust difference is equal to zero or greater than zero, thereby obtaining the lowest exhaust temperature and determining the exhaust time corresponding to the highest exhaust temperature.

[0110] For ease of understanding, the above steps are illustrated here with an example. For example, when the exhaust temperature detected at the 152th second is 123°C and the exhaust temperature detected at the 153th second is 124°C, the exhaust difference between the 153th second and the 152th second is calculated to be 1°C. Then, the exhaust temperature detected at the 154th second is 126°C, and the exhaust difference between the 153th second and the 152th second is calculated to be 2°C. Then, the exhaust temperature detected at the 155th second is 125°C, and the exhaust difference between the 153th second and the 152th second is calculated to be (-1)°C, indicating that the highest exhaust temperature within the exhaust temperature fluctuation period is 126°C, and the corresponding exhaust time is the 154th second.

[0111] It should also be noted that in this embodiment, at least two maximum exhaust temperatures or minimum exhaust temperatures need to be obtained to obtain the exhaust cycle. The maximum exhaust temperature is used as an example. When the exhaust difference obtained for the first time is greater than zero, the exhaust difference between the exhaust temperatures at two subsequent adjacent moments continues to be obtained until the exhaust difference is equal to zero or less than zero, thereby obtaining the first maximum exhaust temperature, and determining the first exhaust moment corresponding to the first maximum exhaust temperature. Then, the above steps are continued to be executed in a loop, that is, after obtaining the first maximum exhaust temperature, the exhaust difference between the exhaust temperatures at two subsequent adjacent moments continues to be obtained until the second maximum exhaust temperature is obtained according to the exhaust difference, and determining the second exhaust moment corresponding to the second maximum exhaust temperature. It should also be noted that since the exhaust temperature is flexible and variable, the maximum exhaust temperature and the minimum exhaust temperature in each exhaust cycle are not fixed values. Therefore, in this embodiment, the temperature values ​​of the first maximum exhaust temperature and the second maximum exhaust temperature may be the same or different. Finally, the time difference between the first exhaust moment and the second exhaust moment is calculated to obtain the exhaust cycle.

[0112] In addition, in this embodiment, in addition to determining the exhaust temperature extreme value based on the exhaust difference, the exhaust temperature trend change curve of the air conditioner can also be generated according to the exhaust temperature at each moment, so as to determine the exhaust temperature extreme value based on the exhaust temperature trend change curve. This embodiment will not be repeated here.

[0113] The second determination module 40 is configured to determine whether there is a refrigerant leak in the air conditioner based on the exhaust cycle.

[0114] In this embodiment, the above-mentioned exhaust cycle can be used to reduce false alarms of refrigerant leakage, thereby improving the accuracy of refrigerant leakage. Specifically, when the exhaust cycle of the exhaust temperature is detected to be less than the preset exhaust cycle, it is determined that the air conditioner has a primary refrigerant leakage. When the exhaust cycle of the exhaust temperature is detected to be greater than or equal to the preset exhaust cycle, it is determined that the air conditioner has a secondary refrigerant leakage.

[0115] In addition, in this embodiment, if there is a secondary refrigerant leakage in the air conditioner, the operating parameters of the air conditioner can be adjusted so that the air conditioner still has a certain cooling or heating effect, thereby not affecting the normal use of the air conditioner. If there is a primary refrigerant leakage in the air conditioner, it is necessary to immediately control the compressor of the air conditioner to shut down to protect the compressor and other equipment. In addition, a refrigerant leakage prompt message can also be output to remind the user that there is a refrigerant leakage fault in the air conditioner.

[0116] In this embodiment, after detecting that the air conditioner needs to trigger the refrigerant leakage detection function, the exhaust temperature of the air conditioner at each time is obtained to determine the exhaust temperature extreme value of the air conditioner and its corresponding exhaust time, thereby determining the exhaust cycle, and then detecting refrigerant leakage through the exhaust cycle. By determining the exhaust temperature extreme value of the air conditioner and its corresponding exhaust time, an accurate exhaust cycle can be obtained, and then based on the accurate exhaust cycle, false alarms of refrigerant leakage are reduced, thereby improving the accuracy of refrigerant leakage detection.

[0117] In addition, an embodiment of the present invention further provides a computer storage medium, on which a refrigerant leakage detection program is stored. When the refrigerant leakage detection program is executed by a processor, the steps of the refrigerant leakage detection method described above are implemented, which will not be repeated here.

[0118] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0119] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0120] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / R1M, disk, optical disk) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present invention.

[0121] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A refrigerant leakage detection method, characterized in that: The method comprises: When the exhaust temperature of the air conditioner is greater than the preset exhaust temperature and the target operating exhaust parameter of the air conditioner exceeds the preset refrigerant leakage exhaust parameter range, obtaining the exhaust temperature of the air conditioner at each moment in the preset time period; Determining the exhaust temperature extreme value of the air conditioner and the exhaust time corresponding to the exhaust temperature extreme value according to the exhaust temperature at each moment; Acquire the exhaust cycle of the air conditioner according to the exhaust time; It is determined whether there is a refrigerant leak in the air conditioner based on the exhaust cycle.

2. The refrigerant leakage detection method according to claim 1, characterized in that: The step of determining the exhaust temperature extreme value of the air conditioner according to the exhaust temperature at each moment comprises: Determine the exhaust gas difference between the exhaust gas temperatures at two adjacent moments; The exhaust temperature extreme value of the air conditioner is determined according to the exhaust difference.

3. The refrigerant leakage detection method according to claim 1, characterized in that: The step of determining whether there is a refrigerant leak in the air conditioner based on the exhaust cycle further includes: When the exhaust cycle of the exhaust temperature is less than a preset exhaust cycle, it is determined that there is a primary refrigerant leakage in the air conditioner; When the exhaust cycle of the exhaust temperature is greater than or equal to a preset exhaust cycle, it is determined that there is a secondary refrigerant leakage in the air conditioner.

4. The refrigerant leakage detection method according to claim 3, characterized in that: After the step of determining whether the air conditioner has a secondary refrigerant leakage, the method further includes: The operating frequency of the compressor of the air conditioner is reduced, and the opening degree of the outdoor electronic expansion valve of the air conditioner is increased.

5. The refrigerant leakage detection method according to claim 4, characterized in that: After the step of reducing the operating frequency of the compressor of the air conditioner and increasing the opening of the outdoor electronic expansion valve of the air conditioner, the method further includes: Controlling the air conditioner to restart and obtaining target operating exhaust parameters of the air conditioner; When it is detected that the target operating exhaust parameter exceeds a preset parameter range for refrigerant leakage detection, the compressor of the air conditioner is controlled to stop, and a refrigerant leakage prompt message is output.

6. The refrigerant leakage detection method according to claim 5, characterized in that: After the step of obtaining the target operating exhaust parameters of the air conditioner, the method further includes: When it is detected that the target operating exhaust parameter does not exceed the preset parameter range of refrigerant leakage detection, the operating frequency of the compressor of the air conditioner is reduced, and the opening degree of the outdoor electronic expansion valve of the air conditioner is increased.

7. The refrigerant leakage detection method according to claim 3, characterized in that: After the step of determining whether the air conditioner has a primary refrigerant leakage, the method further includes: The compressor of the air conditioner is controlled to stop, and a refrigerant leakage prompt message is output.

8. The refrigerant leakage detection method according to any one of claims 1 to 7, characterized in that: When the exhaust temperature of the air conditioner is greater than the preset exhaust temperature and the target operating exhaust parameter of the air conditioner exceeds the preset refrigerant leakage exhaust parameter range, the step of obtaining the exhaust temperature of the air conditioner at each moment in a preset time period also includes: When the exhaust temperature of the air conditioner is greater than a preset exhaust temperature, adjusting the operating state of the air conditioner, and obtaining a target operating exhaust parameter when the air conditioner operates in the adjusted operating state; When the target operating exhaust parameter of the air conditioner exceeds a preset refrigerant leakage exhaust parameter range, the exhaust temperature of the air conditioner at each moment in a preset time period is obtained.

9. A refrigerant leakage detection device, characterized in that: The refrigerant leakage detection device comprises: A first acquisition module, for acquiring the exhaust temperature of the air conditioner at each moment in a preset time period when the exhaust temperature of the air conditioner is greater than a preset exhaust temperature and the target operating exhaust parameter of the air conditioner exceeds a preset refrigerant leakage exhaust parameter range; A first determination module, for determining an exhaust temperature extreme value of the air conditioner and an exhaust time corresponding to the exhaust temperature extreme value according to the exhaust temperature at each moment; A second acquisition module, used for acquiring an exhaust cycle of the air conditioner according to the exhaust time; The second determination module is used to determine whether there is a refrigerant leak in the air conditioner based on the exhaust cycle.

10. An air conditioner, characterized in that: The air conditioner includes a processor, a memory, and a refrigerant leakage detection program stored in the memory. When the refrigerant leakage detection program is executed by the processor, the steps of the refrigerant leakage detection method according to any one of claims 1 to 8 are implemented.

11. A computer storage medium, characterized in that: The computer storage medium stores a refrigerant leakage detection program, and when the refrigerant leakage detection program is executed by the processor, the steps of the refrigerant leakage detection method according to any one of claims 1 to 8 are implemented.

Images