Refrigerant leakage detection method for air conditioner, control apparatus, and storage medium

Abstract

The present application discloses a refrigerant leakage detection method for an air conditioner, and a control apparatus. The method comprises: when a starting control signal is received, controlling an electronic expansion valve to be reset to an initial preset opening degree (S320); acquiring a first indoor heat exchanger average temperature value and a first outdoor heat exchanger average temperature value within a first preset duration (S330); controlling a compressor to be started, and acquiring the operating current of the compressor within a second preset duration (S340); performing first leakage determination on the basis of the operating current of the compressor; when the result of the first leakage determination is that no refrigerant leakage occurs, acquiring a second indoor heat exchanger average temperature value and a second outdoor heat exchanger average temperature value within a third preset duration (S350); and performing second leakage determination on the basis of the first indoor heat exchanger average temperature value, the first outdoor heat exchanger average temperature value, the second indoor heat exchanger average temperature value, and the second outdoor heat exchanger average temperature value (S360).

Description

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

[0001] Cross Reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202410542339.8, filed on April 30, 2024, and entitled "Refrigerant leakage detection method, control device and storage medium of air conditioner", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of air conditioners, and in particular to a refrigerant leakage detection method of an air conditioner, a running control device, an air conditioner and a computer readable storage medium. BACKGROUND

[0004] Currently, some variable frequency air conditioner products usually have a refrigerant leakage detection function, but generally need to spend a long time (such as about 20 minutes) after starting to detect whether there is refrigerant leakage, and during this detection period, the air conditioner is in a continuous running state. If the air conditioner actually has a refrigerant leakage problem, the exhaust port of the compressor may be blocked, and the accumulation of air in the compressor caused by the long-term non-flowing of air may cause the risk of explosion of the compressor, shorten the service life of the air conditioner, and also difficult to protect the life safety of the user. In addition, due to the slow detection speed, the user cannot repair as soon as possible, and the air conditioner cannot normally cool or heat during this period, which is very poor user experience.

[0005] SUMMARY

[0006] The present application aims to at least partially solve one of the technical problems existing in the prior art, and provides a refrigerant leakage detection method of an air conditioner, a running control device, an air conditioner and a computer readable storage medium.

[0007] In a first aspect, the present application provides a refrigerant leakage detection method of an air conditioner, the air conditioner comprising a compressor, a four-way valve connected with the compressor, an indoor heat exchanger and an outdoor heat exchanger connected with the four-way valve, and an electronic expansion valve arranged between the indoor heat exchanger and the outdoor heat exchanger, the method comprising:

[0008] When a start control signal is received, the electronic expansion valve is controlled to reset to an initial preset opening degree;

[0009] Obtaining the indoor heat exchanger temperature and the outdoor heat exchanger temperature within a first preset time period, and calculating a first indoor heat exchanger temperature average value and a first outdoor heat exchanger temperature average value;

[0010] controlling the compressor to start, and obtaining a compressor running current in a second preset time period;

[0011] performing a first leakage judgment according to the compressor running current;

[0012] when the result of the first leakage judgment is that no refrigerant leakage occurs, obtaining an indoor heat exchanger temperature and an outdoor heat exchanger temperature in a third preset time period, and calculating a second indoor heat exchanger temperature average and a second outdoor heat exchanger temperature average; and

[0013] performing a second leakage judgment according to the first indoor heat exchanger temperature average, the first outdoor heat exchanger temperature average, the second indoor heat exchanger temperature average and the second outdoor heat exchanger temperature average.

[0014] According to the refrigerant leakage detection method provided by some embodiments of the present application, in the first preset time period, the compressor is controlled to remain stopped.

[0015] According to the refrigerant leakage detection method provided by some embodiments of the present application, in the second preset time period, the operating frequency of the compressor is gradually increased to a preset frequency and then remains unchanged.

[0016] According to the refrigerant leakage detection method provided by some embodiments of the present application, in the first leakage judgment:

[0017] when the compressor running current is less than a preset current value, the judgment result is that refrigerant leakage occurs;

[0018] when the compressor running current is greater than or equal to the preset current value, the judgment result is that no refrigerant leakage occurs.

[0019] According to the refrigerant leakage detection method provided by some embodiments of the present application, in the second leakage judgment:

[0020] when the difference between the first indoor heat exchanger temperature average and the second indoor heat exchanger temperature average is less than a first preset value, and the difference between the first outdoor heat exchanger temperature average and the second outdoor heat exchanger temperature average is less than a second preset value, the judgment result is that refrigerant leakage occurs; otherwise, the judgment result is that no refrigerant leakage occurs.

[0021] According to the refrigerant leakage detection method provided by some embodiments of the present application, the first preset time period and the second preset time period are both greater than 30 seconds and less than 60 seconds.

[0022] According to the refrigerant leakage detection method provided by some embodiments of the present application, the third preset time period is greater than 3 minutes and less than 5 minutes.

[0023] According to the refrigerant leakage detection method provided by some embodiments of the present application, when the result of the judgment is that refrigerant leakage occurs, the compressor is controlled to stop, and a refrigerant leakage sign is displayed.

[0024] In a second aspect, the embodiments of the present application provide a running control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the program to implement the refrigerant leakage detection method of the air conditioner according to the first aspect.

[0025] In a third aspect, the embodiments of the present application provide an air conditioner, including the running control device according to the second aspect.

[0026] In a fourth aspect, the embodiments of the present application provide a computer readable storage medium, which stores computer executable instructions for causing a computer to execute the refrigerant leakage detection method of the air conditioner according to the first aspect.

[0027] Other features and advantages of the present application will be further described in the following description, and will become apparent from the description, or will be learned through practice of the present application. The objects and other advantages of the present application will be realized and achieved by particularly pointed out in the description, claims, and accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings are included to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation to the technical solutions of the present application.

[0029] The present application will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] FIG. 1 is a structural schematic diagram of an air conditioner according to an embodiment of the present application;

[0031] FIG. 2 is a structural schematic diagram of another air conditioner according to an embodiment of the present application;

[0032] FIG. 3 is a logic schematic diagram of a refrigerant leakage detection method of an air conditioner according to an embodiment of the present application;

[0033] FIG. 4 is a logic schematic diagram of another refrigerant leakage detection method of an air conditioner according to an embodiment of the present application; and

[0034] FIG. 5 is a structural schematic diagram of a running device according to an embodiment of the present application. DETAILED DESCRIPTION

[0035] The detailed description of the application will be described in detail in this part, the preferred embodiments of the application are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical solution of the application, but it cannot be understood as a limitation on the protection scope of the application.

[0036] In the description of the application, if the first, second is described for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0037] In the description of the application, unless otherwise explicitly limited, the words such as setting, installation, connection, etc. should be understood broadly, and the person skilled in the art can reasonably determine the specific meaning of the above words in the application in combination with the specific content of the technical solution.

[0038] At present, for some variable frequency air conditioner products, the refrigerant leakage detection function is usually provided, but generally it needs to spend a long time (such as about 20 minutes) after starting to detect whether there is refrigerant leakage, and during this detection period, the air conditioner is in a continuous running state. If the air conditioner actually has refrigerant leakage problem, the exhaust port of the compressor may be blocked, and the non-flow of air for a long time will cause the air to be continuously compressed and accumulated in the compressor, which may cause the risk of explosion of the compressor, shorten the service life of the air conditioner, and also difficult to protect the life safety of the user. In addition, due to the slow detection speed, the user cannot repair as soon as possible, and during this period, the air conditioner cannot normally cool or heat, and the user experience is very poor.

[0039] Based on this, the embodiments of the application provide a refrigerant leakage detection method, operation control device, air conditioner and computer readable storage medium of the air conditioner, which can quickly detect whether the air conditioner has refrigerant leakage, prolong the service life of the air conditioner and protect the life safety of the user, and improve the user experience.

[0040] The embodiments of the application will be further described below with reference to the drawings.

[0041] Referring to FIG. 1, the air conditioner includes a compressor 110, a four-way valve 120 connected with the compressor 110, an indoor heat exchanger 150 and an outdoor heat exchanger 130 connected with the four-way valve 120, an electronic expansion valve 140 arranged between the indoor heat exchanger 150 and the outdoor heat exchanger 130, a first sensor 160 for detecting the outdoor heat exchanger temperature T2, and a second sensor 170 for detecting the indoor heat exchanger temperature T1.

[0042] It should be noted that referring to FIG. 2, the air conditioner further comprises a hot gas bypass pipe 240, a flash evaporator 220, a capillary tube 210 and a control valve 230, the first refrigerant port of the flash evaporator 220 is connected with one end of the capillary tube 210, the other end of the capillary tube 210 is connected with the outdoor heat exchanger 130, the second refrigerant port of the flash evaporator 220 is connected with one end of the electronic expansion valve 140, the other end of the electronic expansion valve 140 is connected with one end of the hot gas bypass pipe 240, the other end of the hot gas bypass pipe 240 is connected with the indoor heat exchanger 150, the gas outlet of the flash evaporator 220 is connected with one end of the control valve 230, and the other end of the control valve 230 is connected with the gas supplement port of the compressor 110. It should be noted that in a low temperature environment, the condensed water formed after defrosting the surface of the outdoor heat exchanger 130 is easy to condense into ice layer at the bottom of the outdoor heat exchanger 130, thereby affecting the heat exchange efficiency of the outdoor heat exchanger 130. Therefore, the ice removal operation can be realized by adjusting the heat supply of the hot gas bypass pipe 240. It should be noted that the flash evaporator 220 can separate the gaseous refrigerant and the liquid refrigerant, the gaseous refrigerant is transported to the gas supplement port through the gas outlet, and the liquid refrigerant flows out from the first refrigerant port to continue the refrigerant circulation.

[0043] Referring to FIG. 3, the first aspect embodiment of the present application provides a refrigerant leakage detection method of an air conditioner, comprising steps S310-S360:

[0044] Step S310: When receiving the start control signal, the electronic expansion valve 140 is controlled to reset to the initial preset opening degree.

[0045] It can be understood that before acquiring the relevant parameters for leakage detection each time, the electronic expansion valve 140 is reset to the initial preset opening degree, so that the conditions for acquiring the parameters each time are the same. Generally, before the air conditioner is normally stopped each time, the electronic expansion valve 140 is controlled to reset to the initial preset opening degree; and in a special shutdown case, for example, a sudden power failure caused shutdown, the electronic expansion valve 140 is not reset to the initial preset opening degree, but maintains the opening degree before the sudden power failure.

[0046] Step S320: The indoor heat exchanger temperature T1 and the outdoor heat exchanger temperature T2 within a first preset time period are acquired, and the first indoor heat exchanger temperature average T1s and the first outdoor heat exchanger temperature average T2s are calculated.

[0047] In some embodiments, the first preset time period is set to be greater than 30 seconds and less than 60 seconds. It can be understood that the temperature parameters acquired within the first preset time period are saved in the controller of the air conditioner as the relevant parameters for leakage judgment in the subsequent steps.

[0048] Step S330: Control the compressor 110 to start, and acquire the compressor running current in a second preset time length.

[0049] In some embodiments, the second preset time length is set to be greater than 30 seconds and less than 60 seconds.

[0050] Step S340: Perform first leakage judgment according to the compressor running current.

[0051] It can be understood that if the air conditioner has refrigerant leakage, the load condition when the compressor runs will change, so whether the refrigerant leakage occurs can also be judged according to the compressor running current.

[0052] Step S350: When the first leakage judgment result is that no refrigerant leakage occurs, acquire the indoor heat exchanger temperature T1 and the outdoor heat exchanger temperature T2 in a third preset time length, and calculate the second indoor heat exchanger temperature average T1n and the second outdoor heat exchanger temperature average T2n. In some embodiments, the third preset time length is set to be greater than 3 minutes and less than 5 minutes.

[0053] Step S360: Perform second leakage judgment according to the first indoor heat exchanger temperature average T1s, the first outdoor heat exchanger temperature average T2s, the second indoor heat exchanger temperature average T1n and the second outdoor heat exchanger temperature average T2n.

[0054] According to the refrigerant leakage detection method of the air conditioner provided by the embodiment of the present application, when the start control signal is received, the electronic expansion valve 140 is controlled to reset to the initial preset opening degree. During the resetting of the electronic expansion valve 140, the indoor heat exchanger temperature T1 and the outdoor heat exchanger temperature T2 in the first preset time period are obtained, and the first indoor heat exchanger temperature average T1s and the first outdoor heat exchanger temperature average T2s are calculated and obtained. The first indoor heat exchanger temperature average T1s and the first outdoor heat exchanger temperature average T2s are used as the related parameters for the subsequent second leakage judgment. In order to quickly determine whether the refrigerant leakage occurs, after the resetting is completed, the compressor 110 is started, and the compressor running current in the second preset time period is obtained. The first leakage judgment is performed according to the compressor running current. If the result of the first leakage judgment is that the refrigerant leakage occurs, the air conditioner can be immediately controlled by taking relevant measures, and the second leakage judgment is not needed. If the result of the first leakage judgment is that the refrigerant leakage does not occur, in order to improve the accuracy of the detection, the indoor heat exchanger temperature T1 and the outdoor heat exchanger temperature T2 in the third preset time period are obtained, and the second indoor heat exchanger temperature average T1n and the second outdoor heat exchanger temperature average T2n are calculated and obtained. The second leakage judgment is performed according to the first indoor heat exchanger temperature average T1s, the first outdoor heat exchanger temperature average T2s, the second indoor heat exchanger temperature average T1n, and the second outdoor heat exchanger temperature average T2n. Overall, if the refrigerant leakage is relatively serious, the first leakage judgment according to the compressor running current can quickly and accurately determine that the refrigerant leakage exists. For the air conditioner in which the refrigerant leakage is relatively small or does not exist, the first leakage judgment can be performed. In order to improve the accuracy of the detection, the second leakage judgment is needed to determine whether the refrigerant leakage exists. Compared with the time spent in the traditional refrigerant leakage judgment, more than 80% of the time is saved, the risk of explosion of the compressor 110 is reduced, and the service life of the air conditioner is prolonged and the safety of the user is ensured.

[0055] It can be understood that the judgment for the first power-on of the air conditioner is beneficial to quickly detect the risk of refrigerant leakage of the whole machine during transportation and to quickly find problems.

[0056] It should be noted that resetting the electronic expansion valve 140 to the initial preset opening degree can eliminate the influence of the previous running state on the system, so that the system returns to a standard and comparable state. In addition, by controlling the opening degree of the electronic expansion valve 140, the flow of refrigerant in the system can be better controlled, so that the position and degree of refrigerant leakage can be more accurately detected. Therefore, the maintenance personnel can more effectively locate and repair the leakage problem to ensure the normal operation of the air conditioning system.

[0057] It should be noted that the indoor heat exchanger temperature T1 and the outdoor heat exchanger temperature T2 are acquired multiple times within the first preset time period, and the multiple acquired indoor heat exchanger temperatures T1 and the multiple acquired outdoor heat exchanger temperatures T2 are averaged respectively to obtain the first indoor heat exchanger temperature average T1s and the first outdoor heat exchanger temperature average T2s.

[0058] It should be noted that the first indoor heat exchanger temperature average T1s and the first outdoor heat exchanger temperature average T2s acquired during the reset completion of the electronic expansion valve 140 are used for participating in the second leakage judgment, which preferably improves the overall efficiency of the refrigerant leakage detection.

[0059] According to the refrigerant leakage detection method provided by some embodiments of the present application, the compressor 110 is controlled to remain stopped within the first preset time period.

[0060] It should be noted that controlling the compressor 110 to remain stopped can improve the accuracy of the detection result. When the compressor 110 is running, pressure and temperature changes will occur in the system. On the one hand, it is easy to affect the detection results of the first indoor heat exchanger temperature T1 and the first outdoor heat exchanger temperature T2. On the other hand, at this time, the electronic expansion valve 140 of the air conditioner has not been reset to the initial preset opening degree, and the influence of the previous running state on the system has not been eliminated, so the compressor 110 cannot be controlled correctly.

[0061] According to the refrigerant leakage detection method provided by some embodiments of the present application, the operating frequency of the compressor 110 is gradually increased to a preset frequency and then remains unchanged within the second preset time period.

[0062] It should be noted that the operating current of the compressor 110 is acquired after the operating frequency of the compressor 110 is gradually increased to the preset frequency.

[0063] It can be understood that after the compressor 110 is started, it needs a period of time to reach a stable running state. In the initial stage, the current of the compressor 110 may be affected by the starting current, which is usually high and unstable. Therefore, directly detecting at this stage may lead to inaccurate results. After the compressor 110 runs to the preset frequency and stabilizes for a period of time, the influence of the starting current can be eliminated, and the current value becomes more stable. Acquiring the operating current of the compressor 110 at this time can more effectively improve the accuracy of the detection.

[0064] According to the refrigerant leakage detection method provided by some embodiments of the present application, in the first leakage judgment of step S340:

[0065] When the compressor operating current is less than the preset current value, the judgment result is that refrigerant leakage occurs;

[0066] When the compressor operating current is greater than or equal to the preset current value, the result of the judgment is that no refrigerant leakage occurs.

[0067] It should be noted that the preset current value can be set with reference to the current value obtained after the compressor 110 is started and controlled by the air conditioner and the compressor 110 operates to the preset frequency within the second preset time period.

[0068] It should be noted that the compressor 110 is started and controlled, and the compressor operating current within the second preset time period is obtained. When the air conditioner has refrigerant leakage, the operating current of the compressor 110 usually decreases, because refrigerant leakage will cause the refrigeration effect to decrease, the working load of the compressor 110 will be reduced, and thus the operating current will decrease. Therefore, when the compressor operating current is less than the preset current value, the result of the judgment is that refrigerant leakage occurs.

[0069] It should be noted that for the air conditioner with less or no refrigerant leakage, the compressor operating current can be greater than or equal to the preset current value, and the first leakage judgment is that no refrigerant leakage occurs. To obtain more accurate detection results, the second indoor heat exchanger temperature average T1n and the second outdoor heat exchanger temperature average T2n need to be further obtained to prepare for the second leakage judgment.

[0070] According to the refrigerant leakage detection method provided by some embodiments of the present application, in the second leakage judgment of step S360:

[0071] When the difference between the first indoor heat exchanger temperature average T1s and the second indoor heat exchanger temperature average T1n is less than the first preset value, and the difference between the first outdoor heat exchanger temperature average T2s and the second outdoor heat exchanger temperature average T2n is less than the second preset value, the result of the judgment is that refrigerant leakage occurs; otherwise, the result of the judgment is that no refrigerant leakage occurs.

[0072] It can be understood that the difference between the first indoor heat exchanger temperature average T1s and the second indoor heat exchanger temperature average T1n is less than the first preset value, indicating that the heat exchange effect of the indoor heat exchanger is poor within the time period after the compressor is started and operated. Similarly, the difference between the first outdoor heat exchanger temperature average T2s and the second outdoor heat exchanger temperature average T2n is less than the second preset value, indicating that the heat exchange effect of the outdoor heat exchanger is poor within the time period after the compressor is started and operated. When it is judged that the heat exchange effects of the indoor heat exchanger and the outdoor heat exchanger are both poor, it is determined that refrigerant leakage occurs. It should be noted that the indoor heat exchanger temperature T1 and the outdoor heat exchanger temperature T2 are obtained multiple times within the third preset time period, and the multiple indoor heat exchanger temperatures T1 and the multiple outdoor heat exchanger temperatures T2 obtained are averaged respectively to calculate the second indoor heat exchanger temperature average T1n and the second outdoor heat exchanger temperature average T2n.

[0073] It should be noted that when the difference between the average temperature T1s of the first indoor heat exchanger and the average temperature T1n of the second indoor heat exchanger is negative, the absolute value of the difference between the average temperature T1s of the first indoor heat exchanger and the average temperature T1n of the second indoor heat exchanger is obtained and then compared with the first preset value.

[0074] It should be noted that the difference between the average temperature of the first outdoor heat exchanger T2s and the average temperature of the second outdoor heat exchanger T2n is negative. The absolute value of the difference between the average temperature of the first outdoor heat exchanger T2s and the average temperature of the second outdoor heat exchanger T2n is obtained and then compared with the second preset value.

[0075] According to some embodiments of the refrigerant leakage detection method provided in this application, both the first preset duration and the second preset duration are greater than 30 seconds and less than 60 seconds.

[0076] Understandably, within the second preset time period, when the compressor 110 runs at a preset frequency, the operating current of the compressor 110 is obtained, and the first leakage judgment is made based on the compressor operating current. The result of the first leakage judgment can be obtained within 60 seconds, which improves the detection efficiency.

[0077] According to some embodiments of the refrigerant leakage detection method provided in this application, the third preset duration is greater than 3 minutes and less than 5 minutes.

[0078] According to the refrigerant leakage detection method provided in some embodiments of this application, when the determination result is that a refrigerant leak has occurred, the compressor 110 is controlled to stop and a refrigerant leakage symbol is displayed.

[0079] Understandably, after determining that a refrigerant leak has occurred and controlling the compressor 110 to stop, displaying a refrigerant leak indicator can visually show the customer the air conditioner's malfunction, facilitating appropriate repairs. Preferably, the refrigerant leak indicator is a graphic or a code indicating a refrigerant leak fault.

[0080] The following is a comprehensive and detailed description of the refrigerant leakage detection method of this application, using a specific embodiment as an example, in order to illustrate the invention more clearly.

[0081] Referring to Figure 4, which is a schematic diagram of another refrigerant leakage detection method for an air conditioner provided in an embodiment of this application, the method includes steps S401-S408:

[0082] Step S401: When the air conditioner receives the start control signal, it controls the electronic expansion valve 140 to reset to the initial preset opening degree; at this time, the compressor 110 is in the non-start state; then proceed to step S402;

[0083] Step S402: Obtain the indoor heat exchanger temperature T1 and the outdoor heat exchanger temperature T2 within a first preset time length, and calculate the first indoor heat exchanger temperature average T1s and the first outdoor heat exchanger temperature average T2s; wherein the first preset time length is set to be greater than 30 seconds and less than 60 seconds; then jump to step S403;

[0084] Step S403: Control the compressor 110 to start, and after the compressor 110 starts, first run the first platform, which will set a running frequency Fr, and the whole machine will run at the compressor frequency Fr corresponding to the first platform for a second preset time length; at this time, obtain the compressor running current Ir within the second preset time length; then jump to step S404;

[0085] Step S404: Determine whether the compressor running current Ir is less than the preset current value Iset; if yes, jump to step S408, if not, jump to step S405;

[0086] Step S405: Obtain the indoor heat exchanger temperature T1 and the outdoor heat exchanger temperature T2 within a third preset time length, and calculate the second indoor heat exchanger temperature average T1n and the second outdoor heat exchanger temperature average T2n; then jump to step S406;

[0087] Step S406: Determine whether the difference between the first indoor heat exchanger temperature average T1s and the second indoor heat exchanger temperature average T1n is less than the first preset value AT1, and the difference between the first outdoor heat exchanger temperature average T2s and the second outdoor heat exchanger temperature average T2n is less than the second preset value AT2; if yes, jump to step S408, if not, jump to step S407;

[0088] Step S407: The result is that no refrigerant leakage occurs, and the air conditioner runs normally.

[0089] Step S408: The result is that refrigerant leakage occurs, the compressor and other motors of the air conditioner are turned off, and a refrigerant leakage flag is displayed.

[0090] In the embodiment, after the air conditioner is powered on and receives the start control signal, and before the compressor starts, the first indoor heat exchanger temperature average value T1s and the second outdoor heat exchanger temperature average value T2s in a time period are acquired, the compressor is controlled to start, the first leakage judgment is quickly performed according to the compressor running current in the early stage of starting, and then, in the case that the first leakage judgment does not detect refrigerant leakage, the second leakage judgment is performed according to the second indoor heat exchanger temperature average value T1n and the second outdoor heat exchanger temperature average value T2n in a time period after the compressor starts running, in combination with the first indoor heat exchanger temperature average value T1s and the second outdoor heat exchanger temperature average value T2s acquired before the compressor starts, so that different detection parameters are used for multiple leakage judgments during the starting of the compressor and after the starting, which can quickly detect the refrigerant leakage risk and has high detection reliability.

[0091] In a second aspect, referring to FIG. 5, an embodiment of the present application provides an operation control device 500, which includes a memory 510, a processor 520, and a computer program stored in the memory 510 and executable on the processor 520. The processor executes the program to implement the refrigerant leakage detection method of the air conditioner as in the first aspect above, for example, to execute the method steps S310 to S360 in FIG. 3 or the method steps S401 to S408 in FIG. 4.

[0092] In a third aspect, an embodiment of the present application provides an air conditioner, which includes the operation control device 500 as in the second aspect above.

[0093] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, which stores computer executable instructions. The computer executable instructions are used to make a computer execute the refrigerant leakage detection method of the air conditioner as in the first aspect above, for example, to execute the method steps S310 to S360 in FIG. 3 or the method steps S401 to S408 in FIG. 4.

[0094] As will be appreciated by one of ordinary skill in the art, all or some steps, systems of the above-disclosed methods can be implemented in, e.g., software, firmware, hardware, or any suitable combination thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application- specific integrated circuit. Such software can be distributed on computer readable media, which can comprise computer storage media or non-transitory media and communication media or transitory media. As is well known to those of ordinary skill in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media include, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Further, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.

[0095] The embodiments of the present application disclosed above with reference to the drawings are merely exemplary, and the present application is not limited to the above-described embodiments. Various changes can be made by those skilled in the art within the scope of the knowledge possessed by the skilled person without departing from the spirit of the present application.

Claims

1. A refrigerant leakage detection method for an air conditioner, wherein, The air conditioner comprises a compressor, a four-way valve connected with the compressor, an indoor heat exchanger and an outdoor heat exchanger connected with the four-way valve, and an electronic expansion valve arranged between the indoor heat exchanger and the outdoor heat exchanger, and the method comprises the following steps: When a start control signal is received, the electronic expansion valve is controlled to reset to an initial preset opening degree; The indoor heat exchanger temperature and the outdoor heat exchanger temperature within a first preset time period are obtained, and a first indoor heat exchanger temperature average value and a first outdoor heat exchanger temperature average value are calculated; The compressor is controlled to start, and a compressor running current within a second preset time period is obtained; A first leakage judgment is performed according to the compressor running current; When the result of the first leakage judgment is that no refrigerant leakage occurs, the indoor heat exchanger temperature and the outdoor heat exchanger temperature within a third preset time period are obtained, and a second indoor heat exchanger temperature average value and a second outdoor heat exchanger temperature average value are calculated; and A second leakage judgment is performed according to the first indoor heat exchanger temperature average value, the first outdoor heat exchanger temperature average value, the second indoor heat exchanger temperature average value and the second outdoor heat exchanger temperature average value.

2. The refrigerant leak detection method according to claim 1, wherein During the first preset time period, the compressor is controlled to remain stopped.

3. The refrigerant leak detection method according to claim 1 or 2, wherein During the second preset time period, the operating frequency of the compressor is gradually increased to a preset frequency and then remains unchanged.

4. The refrigerant leak detection method according to claim 1 or 3, wherein In the first leakage judgment: When the compressor running current is less than a preset current value, the result of the judgment is that refrigerant leakage occurs; When the compressor running current is greater than or equal to the preset current value, the result of the judgment is that no refrigerant leakage occurs.

5. The refrigerant leak detection method according to any one of claims 1 to 4, wherein In the second leakage judgment: When the difference between the first indoor heat exchanger temperature average value and the second indoor heat exchanger temperature average value is less than a first preset value, and the difference between the first outdoor heat exchanger temperature average value and the second outdoor heat exchanger temperature average value is less than a second preset value, the result of the judgment is that refrigerant leakage occurs; otherwise, the result of the judgment is that no refrigerant leakage occurs.

6. The refrigerant leak detection method according to any one of claims 1 to 5, wherein The first preset time period and the second preset time period are both greater than 30 seconds and less than 60 seconds.

7. The refrigerant leak detection method according to any one of claims 1 to 6, wherein, The third preset time period is greater than 3 minutes and less than 5 minutes.

8. The refrigerant leak detection method according to any one of claims 1 to 7, wherein, When the result of the judgment is that refrigerant leakage occurs, the compressor is controlled to stop, and a refrigerant leakage flag is displayed.

9. An operation control device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the refrigerant leakage detection method of the air conditioner according to any one of claims 1 to 8.

10. An air conditioner comprising the operation control device according to claim 9.

11. A computer-readable storage medium storing computer executable instructions, wherein the computer executable instructions are used to make a computer execute the refrigerant leakage detection method of the air conditioner according to any one of claims 1 to 8.

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