Air conditioner and its refrigerant leakage detection method and device

Abstract

The present invention discloses an air conditioner and a refrigerant leakage detection method and device thereof. The method includes: when the compressor in the air conditioner is in a stable operation stage, obtaining a first current value of the compressor at the current operating frequency; when it is determined that the air conditioner meets a first preset condition according to the first current value, adjusting the operating frequency of the compressor so that the compressor operates at a first target frequency and a second target frequency respectively; obtaining a second current value and a third current value when the compressor operates at the first target frequency and the second target frequency respectively; and determining the refrigerant leakage condition of the air conditioner according to the second current value and the third current value. Thus, this method can accurately judge whether the system refrigerant leaks through a single parameter. Even when the temperature sensor fails and the refrigerant leakage detection function fails, and the refrigerant completely leaks, it can ensure that the compressor will not run idly for a long time and cause burnout, ensuring the reliability of the compressor operation.

Description

Technical Field

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

[0002] With the improvement of people's living standards, the popularity rate of air conditioners is getting higher and higher. Facing the large-scale popularization of air conditioners, the maintenance of air conditioners has become correspondingly frequent, and various problems of air conditioners emerge in an endless stream in the market. For example, the maintenance rate of compressors remains high. Generally, air conditioners are equipped with a refrigerant leakage detection function, but there have been cases where compressors have burned out due to refrigerant leakage in the current market, and a reasonable solution has never been found.

[0003] For portable air conditioners, due to their portable and compact characteristics, they are used in many scenarios, such as kitchens, living rooms, and offices. However, precisely because of their light and compact characteristics, they are often moved around by users or placed in cars for outdoor barbecues and trips. Sometimes, these movements during transportation can cause damage or loosening of internal components of the machine. Generally, air conditioners are equipped with a refrigerant leakage detection function, but these detection functions rely on sensors, such as temperature sensors. If the sensor becomes loose during transportation, the refrigerant leakage detection function will fail. If refrigerant leakage occurs when the refrigerant leakage detection function fails and the compressor continues to operate for a long time, the compressor will burn out. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems in the related art to some extent. For this reason, the first object of the present invention is to propose a refrigerant leakage detection method for an air conditioner. This method can accurately determine whether the refrigerant in the system leaks through a single parameter. Even when the temperature sensor fails and the refrigerant leakage detection function fails, and the refrigerant completely leaks, it can ensure that the compressor will not run idly for a long time and cause burnout, ensuring the reliability of the compressor operation.

[0005] The second object of the present invention is to propose a computer-readable storage medium.

[0006] The third object of the present invention is to propose an air conditioner.

[0007] The fourth object of the present invention is to propose a refrigerant leakage detection device for an air conditioner.

[0008] To achieve the above object, an embodiment of the first aspect of the present invention provides a refrigerant leakage detection method for an air conditioner, including: when the compressor in the air conditioner is in a stable operation stage, obtaining a first current value of the compressor at the current operating frequency; when it is determined that the air conditioner meets a first preset condition according to the first current value, adjusting the operating frequency of the compressor so that the compressor operates at a first target frequency and a second target frequency respectively; obtaining a second current value and a third current value when the compressor operates at the first target frequency and the second target frequency respectively; and determining the refrigerant leakage situation of the air conditioner according to the second current value and the third current value.

[0009] According to the refrigerant leakage detection method for an air conditioner of the embodiment of the present invention, first, when the compressor in the air conditioner is in a stable operation stage, a first current value of the compressor at the current operating frequency is obtained. Then, when it is determined that the air conditioner meets a first preset condition according to the first current value, the operating frequency of the compressor is adjusted so that the compressor operates at a first target frequency and a second target frequency respectively. Subsequently, a second current value and a third current value when the compressor operates at the first target frequency and the second target frequency respectively are obtained. Finally, the refrigerant leakage situation of the air conditioner is determined according to the second current value and the third current value. Thus, this method can accurately judge whether the refrigerant in the system leaks through a single parameter. Even when the temperature sensor fails and the refrigerant leakage detection function fails, and the refrigerant completely leaks, it can ensure that the compressor will not run idly for a long time and cause burnout, ensuring the reliability of the compressor operation.

[0010] In addition, the refrigerant leakage detection method for an air conditioner according to the above embodiment of the present invention may further have the following additional technical features:

[0011] According to an embodiment of the present invention, determining that the air conditioner meets a first preset condition according to the first current value includes: determining a first target current value according to the current indoor environmental temperature and the current operating frequency; and when the first current value is less than the first target current value, determining that the air conditioner meets the first preset condition.

[0012] According to an embodiment of the present invention, determining the refrigerant leakage situation of the air conditioner according to the second current value and the third current value includes: determining a second target current value according to the indoor environmental temperature and the first target frequency, and determining a third target current value according to the indoor environmental temperature and the second target frequency; and when the second current value is less than the second target current value, the third current value is less than the third target current value, and the current difference between the second current value and the third current value is less than a preset current threshold, determining that the refrigerant in the air conditioner leaks.

[0013] According to an embodiment of the present invention, adjusting the operating frequency of the compressor includes: controlling the compressor to operate at the first target frequency, and controlling the compressor to operate at the second target frequency when the second current value is less than the second target current value.

[0014] According to an embodiment of the present invention, the first target frequency is the highest operating frequency of the compressor, and the second target frequency is the lowest operating frequency of the compressor.

[0015] According to an embodiment of the present invention, the first current value, the second current value, and the third current value are all the average values of the compressor current within a preset time.

[0016] According to an embodiment of the present invention, when the compressor in the air conditioner is in a stable operation stage, it includes: when the air conditioner operates in the cooling mode, obtaining the change rate of the operating frequency of the compressor; when the change rate of the operating frequency of the compressor is less than a preset threshold, determining that the compressor is in a stable operation stage.

[0017] To achieve the above object, an embodiment of the second aspect of the present invention provides a computer-readable storage medium, on which a refrigerant leakage detection program of an air conditioner is stored. When the refrigerant leakage detection program of the air conditioner is executed by a processor, the above-mentioned refrigerant leakage detection method of the air conditioner is implemented.

[0018] According to the computer-readable storage medium of the embodiment of the present invention, when the processor executes the refrigerant leakage detection program of the air conditioner, the above-mentioned refrigerant leakage detection method of the air conditioner is implemented. Even when the temperature sensor fails and the refrigerant leakage detection function fails, and the refrigerant leaks completely, it can ensure that the compressor will not run idly for a long time and cause burnout, ensuring the reliability of the compressor operation.

[0019] To achieve the above object, an air conditioner provided by an embodiment of the third aspect of the present invention includes a memory, a processor, and a refrigerant leakage detection program of the air conditioner stored in the memory and executable on the processor. When the processor executes the refrigerant leakage detection program of the air conditioner, the above-mentioned refrigerant leakage detection method of the air conditioner is implemented.

[0020] According to the air conditioner of the embodiment of the present invention, when the processor executes the refrigerant leakage detection program of the air conditioner, the above-mentioned refrigerant leakage detection method of the air conditioner is implemented. Even when the temperature sensor fails and the refrigerant leakage detection function fails, and the refrigerant leaks completely, it can ensure that the compressor will not run idly for a long time and cause burnout, ensuring the reliability of the compressor operation.

[0021] To achieve the above object, a refrigerant leakage detection device for an air conditioner according to an embodiment of the fourth aspect of the present invention includes: an acquisition module, configured to acquire a first current value of a compressor at a current operating frequency when the compressor in the air conditioner is in a stable operating stage; a detection control module, configured to adjust the operating frequency of the compressor when it is determined according to the first current value that the air conditioner meets a first preset condition, so that the compressor operates at a first target frequency and a second target frequency respectively; the acquisition module is further configured to acquire a second current value and a third current value when the compressor operates at the first target frequency and the second target frequency respectively; the detection control module is further configured to determine the refrigerant leakage condition of the air conditioner according to the second current value and the third current value.

[0022] According to the refrigerant leakage detection device of the air conditioner according to an embodiment of the present invention, when the compressor in the air conditioner is in a stable operating stage, the acquisition module acquires a first current value of the compressor at the current operating frequency. When the detection control module determines according to the first current value that the air conditioner meets the first preset condition, it adjusts the operating frequency of the compressor so that the compressor operates at the first target frequency and the second target frequency respectively. Then, the acquisition module acquires the second current value and the third current value when the compressor operates at the first target frequency and the second target frequency respectively, and the detection control module determines the refrigerant leakage condition of the air conditioner according to the second current value and the third current value. Thus, the device can accurately judge whether the refrigerant in the system leaks through a single parameter. Even when the temperature sensor fails and the refrigerant leakage detection function fails, and the refrigerant leaks completely, it can ensure that the compressor will not run idly for a long time and cause burnout, ensuring the reliability of the compressor operation.

[0023] In addition, the refrigerant leakage detection device of the air conditioner according to the above embodiment of the present invention may further have the following additional technical features:

[0024] According to an embodiment of the present invention, the detection control module determines that the air conditioner meets the first preset condition according to the first current value, specifically: determining a first target current value according to the current indoor ambient temperature and the current operating frequency; when the first current value is less than the first target current value, determining that the air conditioner meets the first preset condition.

[0025] According to an embodiment of the present invention, the detection control module determines the refrigerant leakage condition of the air conditioner according to the second current value and the third current value, specifically: determining a second target current value according to the indoor ambient temperature and the first target frequency, and determining a third target current value according to the indoor ambient temperature and the second target frequency; when the second current value is less than the second target current value, the third current value is less than the third target current value, and the current difference between the second current value and the third current value is less than a preset current threshold, determining that the refrigerant in the air conditioner leaks.

[0026] According to an embodiment of the present invention, the detection control module adjusts the operating frequency of the compressor, specifically for: controlling the compressor to operate at a first target frequency, and controlling the compressor to operate at a second target frequency when the second current value is less than the second target current value.

[0027] According to an embodiment of the present invention, the first target frequency is the highest operating frequency of the compressor, and the second target frequency is the lowest operating frequency of the compressor.

[0028] According to an embodiment of the present invention, the first current value, the second current value, and the third current value are all the average current values of the compressor within a preset time.

[0029] According to an embodiment of the present invention, the detection module is further used for: when the air conditioner operates in the cooling mode, obtaining the change rate of the operating frequency of the compressor; and when the change rate of the operating frequency of the compressor is less than a preset threshold, determining that the compressor is in a stable operating stage.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0031] Figure 1 It is a flowchart of a refrigerant leakage detection method for an air conditioner according to an embodiment of the present invention;

[0032] Figure 2 It is a front view of an air conditioner according to an embodiment of the present invention;

[0033] Figure 3 It is a sectional view of an air conditioner according to an embodiment of the present invention;

[0034] Figure 4 It is a sectional view of the air conditioner from another angle according to an embodiment of the present invention;

[0035] Figure 5 It is a flowchart of a refrigerant leakage detection method for an air conditioner according to a specific embodiment of the present invention;

[0036] Figure 6 It is a block diagram of an air conditioner according to an embodiment of the present invention;

[0037] Figure 7 It is a block diagram of a refrigerant leakage detection device for an air conditioner according to an embodiment of the present invention. Detailed Embodiments

[0038] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] A refrigerant leakage detection method, a computer-readable storage medium, an air conditioner, and a refrigerant leakage detection device for an air conditioner according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0040] Figure 1 It is a flowchart of a refrigerant leakage detection method for an air conditioner according to an embodiment of the present invention.

[0041] It should be noted that the air conditioner in the present invention may be a portable air conditioner. Refer to Figures 2 - 4 As shown, for the portable air conditioner 100 according to an embodiment of the present invention, the portable air conditioner 100 includes a front frame 1. The front frame 1 is provided with an air outlet 11. The portable air conditioner 100 further includes a heat exchanger. The heat exchanger includes an evaporator 12 and a condenser 13. The evaporator 12 includes a first evaporator 131 and a second evaporator 132. The condenser 13 includes a first condenser 121 and a second condenser 122. The portable air conditioner 100 further includes a fan assembly. The fan assembly includes a motor, a wind wheel, and a bracket. In terms of structural position, the evaporator 12 is disposed above the condenser 13, and the evaporator 12 and the condenser 13 are arranged in one-to-one correspondence. A fan assembly is installed between the first evaporator 131 and the second evaporator 132, and between the first condenser 121 and the second condenser 122. Among them, when the portable air conditioner 100 is refrigerating, it adopts the vapor compression refrigeration principle, including an evaporator 12, a condenser 13, a compressor 15, and a throttling device. The devices are connected by copper pipes, and the specific working principle will not be elaborated here.

[0042] Furthermore, the portable air conditioner 100 may further include a door body 2. An air outlet 11 is formed on the front frame 1. The front frame 1 is provided with a first magnetic attraction member, and the door body 2 is provided with a second magnetic attraction member that is attracted to the first magnetic attraction member, so that the door body 2 can be converted between an open position for opening the air outlet 11 and a closed position for closing the air outlet 11. Among them, in the open position, the door body 2 opens the air outlet 11, and in the closed position, the door body 2 closes the air outlet 11.

[0043] Among them, through the mutual attraction of the first magnetic attraction member and the second magnetic attraction member, the door body 2 can be in the open position. At this time, the door body 2 does not block the air outlet 11, so that air can be discharged from the air outlet 11; when the door body 2 closes the air outlet 11, through the mutual attraction of the first magnetic attraction member and the second magnetic attraction member, the door body 2 can be in the closed position. At this time, the air outlet 11 can be closed by the door body 2, so that dust will not enter the interior of the portable air conditioner 100 through the air outlet 11, thereby protecting the portable air conditioner 100, extending the service life of the portable air conditioner 100, and further solving the technical problem of poor dust sealing effect in the related art.

[0044] Further, the door body 2 and the front frame 1 are magnetically attracted together by the magnetic attraction member, so that the door body 2 can not only move relative to the front frame 1 more conveniently, but also be assembled and disassembled with the front frame 1 more conveniently. In some embodiments, when the door body 2 is switched between the open position and the closed position, it can be manually pulled outwards to separate the door body 2 from the front frame 1, and then the door body 2 is moved to the open position or the closed position, and the door body 2 and the front frame 1 are fixed by magnetic attraction.

[0045] In some embodiments, a sliding groove may be provided on one of the door body 2 and the front frame 1, and a pulley or a sliding rail may be provided on the other of the door body 2 and the front frame 1. The pulley or the sliding rail is adapted to cooperate in the sliding groove. When the door body 2 is switched between the open position and the closed position, the door body 2 can be driven to slide, so that the door body 2 can be conveniently slid to the open position or the closed position.

[0046] Further, the front frame 1 is provided with a first installation groove, and the first magnetic attraction member is arranged in the first installation groove. Thus, the first magnetic attraction member can be fixed through the first installation groove, thereby preventing the first magnetic attraction member from moving with the second magnetic attraction member when the door body 2 is switched between the open position and the closed position, resulting in the door body 2 being stuck.

[0047] Optionally, the first magnetic attraction member is in interference fit with the first installation groove. Thus, after the first magnetic attraction member is installed in the first installation groove, at least part of the first magnetic attraction member abuts against the inner wall of the first installation groove to limit the first magnetic attraction member by the first installation groove, which is beneficial to ensuring the assembly reliability of the first magnetic attraction member in the first installation groove.

[0048] Optionally, the first installation groove is configured as a circular groove, and the first magnetic attraction member is a cylinder. Optionally, the diameter of the first installation groove is slightly smaller than the diameter of the first magnetic attraction member. In addition, in the thickness direction of the front frame 1, the depth of the first installation groove may be greater than the height of the first magnetic member. In some embodiments, the depth of the first installation groove may also be less than or equal to the height of the first magnetic member, and the present invention does not make specific limitations thereto.

[0049] Further, a plurality of ribs are provided on the inner wall of the first installation groove at circumferential intervals, that is, a plurality of ribs are provided on the inner wall of the first installation groove, and the plurality of ribs can be arranged at intervals on the inner wall surface of the first installation groove. In some embodiments, the outer shape of the first installation groove is circular, and the plurality of ribs can be evenly arranged at intervals on the inner wall surface of the first installation groove. After the first magnetic member is fitted into the first installation groove, the ribs can abut against the first magnetic member, so that the first magnetic member can be limited by the plurality of ribs. At the same time, by limiting the first magnetic member with the plurality of ribs, the rotation of the first magnetic member can also be prevented, so that the first magnetic member can stably cooperate with the second magnetic member.

[0050] In some embodiments of the present invention, there are a plurality of first magnetic members, and the second magnetic member includes one or more.

[0051] In some embodiments, both the first magnetic member and the second magnetic member can include a plurality (here, a plurality means two or more). In this way, by making the second magnetic member on the door body 2 attract the first magnetic member on the face frame 1, it is convenient to realize the conversion of the door body 2 between the open position and the closed position relative to the face frame 1.

[0052] In other embodiments, there are a plurality of first magnetic members, and the second magnetic member includes one. Specifically, the plurality of first magnetic members are installed on the face frame 1 at intervals. The second magnetic member can be installed at the top of the door body 2, or at the bottom of the door body 2, or in the middle of the door body 2. There is no limitation on the specific installation position of the second magnetic member. One second magnetic member is attracted to different first magnetic members respectively, and the door body 2 can also be convertible between the open position and the closed position.

[0053] In some embodiments of the present invention, the first magnetic member includes three pairs. The three pairs of first magnetic members are arranged on the face frame 1 at intervals along the length direction of the face frame 1, and the distance between adjacent pairs of first magnetic members is equal. The second magnetic member includes two pairs. The two pairs of second magnetic members are arranged on the door body 2 at intervals along the length direction of the door body 2, and the distance between the two pairs of second magnetic members is equal to the distance between adjacent pairs of first magnetic members. Thus, the two pairs of second magnetic members can be respectively attracted to the adjacent two pairs of first magnetic members, so that the door body 2 can be firmly attracted to the face frame 1 and will not fall off after being attracted.

[0054] In some embodiments of the present invention, the door body 2 forms a second installation groove, and the second magnetic member is arranged in the second installation groove. Thus, the second magnetic member can be limited by the second installation groove, so that the second magnetic member can be firmly fixed in the second installation groove, and the second magnetic member can be prevented from detaching from the second installation groove, which is convenient to realize the conversion of the door body 2 between the open position and the closed position.

[0055] Such asFigure 1 As shown in the figure, the refrigerant leakage detection method of the air conditioner according to the embodiment of the present invention may include:

[0056] S1. When the compressor in the air conditioner is in a stable operation stage, obtain the first current value of the compressor at the current operating frequency. Wherein, the first current value is the average value of the compressor current within a preset time, and the preset time can be calibrated according to the actual situation.

[0057] Specifically, when the air conditioner is in the cooling mode, first judge the current working state of the compressor. If the working state of the compressor is normal, that is, in the stable operation stage, obtain the current compressor operating frequency F1 and the current compressor current value d1. To ensure the accuracy of the obtained compressor current, after the compressor runs at the frequency F1 for a period of time, obtain the average value of the compressor current values within this period of time, which is the first current value D1.

[0058] According to an embodiment of the present invention, the compressor in the air conditioner being in a stable operation stage may include: when the air conditioner operates in the cooling mode, obtain the change rate of the operating frequency of the compressor; when the change rate of the operating frequency of the compressor is less than a preset threshold, determine that the compressor is in the stable operation stage. Wherein, the preset threshold is related to the operating frequency of the compressor and can be preset and stored according to the actual situation.

[0059] Specifically, for the judgment of whether the compressor in the air conditioner is in the stable operation stage, first determine whether the air conditioner is in the cooling mode. If it is in the cooling mode, obtain the current compressor operating frequency F and the operating frequency F1 of the compressor after running for a period of time, and determine the change rate of the frequency according to F and F1. Wherein, the change rate of the frequency refers to the change rate within a period of time when the compressor operates. For example, after the compressor runs for a period of time Δt, obtain the operating frequency F1 of the compressor, then the change rate of the operating frequency of the compressor within the time Δt is V = |F1 - F| / Δt, where Δt can be set according to the actual situation. For example, Δt can be taken as 2 - 5 minutes. After obtaining the change rate of the frequency of the compressor, call the preset threshold stored in advance and compare V (the change rate of the frequency) with the preset threshold. If V is less than the preset threshold, it means that the current frequency fluctuation of the compressor is very small and it is in the stable operation stage, and it is determined that the working state of the compressor is normal; if V is greater than or equal to the preset threshold, it means that the current frequency fluctuation of the compressor is relatively large, and at this time the compressor is not in the stable operation stage, and continue to execute the above steps until the obtained V is less than the preset threshold to determine that the compressor is in stable operation.

[0060] S2. When it is determined that the air conditioner meets the first preset condition according to the first current value, adjust the operating frequency of the compressor so that the compressor operates at a first target frequency and a second target frequency respectively. The first target frequency is the highest operating frequency of the compressor, and the second target frequency is the lowest operating frequency of the compressor.

[0061] According to an embodiment of the present invention, determining that the air conditioner meets the first preset condition according to the first current value may include: determining a first target current value according to the current indoor environmental temperature and the current operating frequency; when the first current value is less than the first target current value, determining that the air conditioner meets the first preset condition. The first target current value can be preset according to the actual situation. For example, according to the environmental temperature and the operating frequency of the compressor, test the current situation when the compressor works normally, and then pre-store the test results, that is, pre-store the corresponding relationship between the environmental temperature - current operating frequency - target current value.

[0062] Specifically, obtain the current indoor environmental temperature where the air conditioner is located and the current operating frequency of the compressor, then call the relationship table between the environmental temperature - current operating frequency - target current value stored in advance, and find out the corresponding first target current value M1. Then compare the first current value D1 with the first target current value M1, and select the corresponding control strategy according to the comparison result. Among them, if D1 is less than M1, it means that the air conditioner meets the first preset condition. At this time, adjust the operating frequency of the compressor to F2 (the first target frequency) and F3 (the second target frequency) respectively, and control the compressor to operate at frequencies F2 and F3 for a certain period of time respectively; if D1 is greater than or equal to M1, it means that the air conditioner does not meet the first preset condition. At this time, it is considered that the current value of the compressor at the current operating frequency is normal, and it is determined that there is no refrigerant leakage in the air conditioner.

[0063] It should be noted that the above first target current value M1 is an interval value obtained through experiments. In the experimental stage, test the current situation of the compressor according to the indoor environmental temperature and the operating frequency, and then store it in the database. When judging, only need to call the stored database according to the measured current indoor environmental temperature and the operating frequency of the compressor to obtain the corresponding target current value.

[0064] S3. Obtain a second current value and a third current value when the compressor operates at the first target frequency and the second target frequency respectively. The second current value and the third current value are both the average current value of the compressor within a preset time.

[0065] Specifically, when it is determined that the air conditioner meets the first preset condition, the operating frequency of the compressor is controlled to be increased to F2 (the first target frequency, such as the preset maximum frequency), and the compressor current value D2 (the second current value) at the preset maximum frequency is detected. The acquisition method of the current value D2 can be the same as that of the first current value D1, that is, after the compressor operates at the frequency F2 for a period of time, the average value of the compressor current values during this period is obtained, which is the second current value D2. Then, the operating frequency of the compressor is controlled to be decreased to F3 (the second target frequency, such as the preset minimum frequency), and the compressor current value D3 (the third current value) at the preset minimum frequency is detected. The acquisition method of the current value D3 can be the same as that of the first current value D1, that is, after the compressor operates at the frequency F3 for a period of time, the average value of the compressor current values during this period is obtained, which is the third current value D3.

[0066] S4. Determine the refrigerant leakage situation of the air conditioner according to the second current value and the third current value.

[0067] According to an embodiment of the present invention, determining the refrigerant leakage situation of the air conditioner according to the second current value and the third current value may include: determining a second target current value according to the indoor environmental temperature and the first target frequency, and determining a third target current value according to the indoor environmental temperature and the second target frequency; when the second current value is less than the second target current value, the third current value is less than the third target current value, and the current difference between the second current value and the third current value is less than a preset current threshold, it is determined that the refrigerant of the air conditioner leaks. Among them, the second target current value, the third target current value, and the preset current threshold are preset according to the actual situation. The setting methods of the second target current value and the third target current value can refer to the acquisition method of the above-mentioned first target current value, which will not be elaborated here.

[0068] Specifically, obtain the indoor environmental temperature when the air conditioner operates at F2 (the first target frequency, such as the preset maximum frequency), then call the pre-stored database (the corresponding relationship between the environmental temperature - the current operating frequency - the target current value), find out the corresponding second target current value M2, and find the corresponding second target current value M3 when the air conditioner operates at F3 (the second target frequency, such as the preset minimum frequency). Then, compare the second current value D2 with the second target current value M2, and select the corresponding control strategy according to the comparison result. Among them, if D2 is less than M2, further determine whether to compare the third current value D3 with the third target current value M3. If D3 is less than M3, further obtain the current difference between the second current value and the third current value, denoted as ΔD = D2 - D3. If ΔD is less than the preset current threshold M4, it means that the change in the compressor current value is very small and does not reach the preset range. At this time, it is determined that the compressor is idling, and it is determined that the air conditioner has refrigerant leakage. At this time, the system issues a refrigerant leakage prompt to prevent the compressor from burning out due to long-term idling. That is to say, if there is still refrigerant in the refrigeration system, the current difference between the maximum and minimum operating frequencies of the compressor will be very large. If the current difference is very small, it only means that the refrigerant in the system has completely leaked out, and the compressor is idling at this time.

[0069] If D2 is greater than or equal to M2, or D3 is greater than or equal to M3, or ΔD is greater than or equal to the preset current threshold M4, it means that the current value of the air conditioner at the corresponding operating frequency is normal, and it is determined that there is no refrigerant leakage in the air conditioner.

[0070] In addition, according to an embodiment of the present invention, adjusting the operating frequency of the compressor may include: controlling the compressor to operate at the first target frequency, and controlling the compressor to operate at the second target frequency when the second current value is less than the second target current value.

[0071] Specifically, during the process of adjusting the operating frequency of the compressor, when obtaining the current value D2 when the compressor operates at the highest operating frequency F2, first judge the magnitude relationship between D2 and M2. If D2 is less than M2, further lower the operating frequency of the compressor to the lowest operating frequency F3 and obtain the current value D3. Then compare the magnitude relationship between D3 and M3, and when D3 is less than M3, perform the next comparison of the current difference to determine whether there is refrigerant leakage in the air conditioner.

[0072] As a specific example of the refrigerant leakage detection method of an air conditioner according to the present invention, as Figure 5 shown, the refrigerant leakage detection method of the air conditioner includes the following steps:

[0073] S101, when the air conditioner operates in the cooling mode, obtain the change rate V of the compressor operating frequency.

[0074] S102, Determine whether the operating frequency change rate V is less than a preset threshold. If not, return to step S101; if so, then execute step S103.

[0075] S103, Obtain the current operating frequency F1 of the compressor and the first current value D1.

[0076] S104, Determine whether the first current value D1 is less than the first target current value M1. If not, then execute step S111; if so, then execute step S105.

[0077] S105, Operate the compressor at the first target frequency F2 and obtain the second current value D2.

[0078] S106, Determine whether the second current value D2 is less than the second target current value M2. If so, then execute step S107; if not, then execute step S111.

[0079] S107, Operate the compressor at the second target frequency F3 and obtain the third target current value D3.

[0080] S108, Determine whether the third current value D3 is less than the third target current value M3. If less, then execute step S109; if not, then execute step S111.

[0081] S109, Determine whether the difference between the second current value D2 and the third current value D3 is less than the preset current threshold M4. If so, then execute step S110; if not, then execute step S111.

[0082] S110, Refrigerant leakage.

[0083] S111, No refrigerant leakage.

[0084] Thus, the detection method of the present invention can accurately determine whether the refrigerant in the system is completely leaked and whether the compressor is idling by detecting the current value of the compressor in the stable operation stage of the refrigeration mode and comparing the compressor current values at the highest and lowest operating frequencies. Even if the temperature sensor fails, the refrigerant leakage detection function fails, and the refrigerant is completely leaked, it can ensure that the compressor will not be burned out due to long-term idling. The compressor not being burned out is the last line of defense for system control, ensuring the reliability of the compressor operation.

[0085] In summary, according to the refrigerant leakage detection method of the air conditioner according to the embodiments of the present invention, first, when the compressor in the air conditioner is in a stable operation stage, the first current value of the compressor at the current operating frequency is obtained. Then, when it is determined that the air conditioner meets the first preset condition according to the first current value, the operating frequency of the compressor is adjusted so that the compressor operates at the first target frequency and the second target frequency respectively. Subsequently, the second current value and the third current value of the compressor when it operates at the first target frequency and the second target frequency respectively are obtained. Finally, the refrigerant leakage situation of the air conditioner is determined according to the second current value and the third current value. Thus, this method can accurately determine whether the system refrigerant leaks through a single parameter. Even in the case of temperature sensor failure, refrigerant leakage detection function failure, and complete refrigerant leakage, it can ensure that the compressor will not run idly for a long time and cause burnout, ensuring the reliability of the compressor operation.

[0086] Corresponding to the above embodiments, the present invention also proposes a computer-readable storage medium.

[0087] A computer-readable storage medium according to an embodiment of the present invention stores a refrigerant leakage detection program for an air conditioner. When the refrigerant leakage detection program for the air conditioner is executed by a processor, the above-mentioned refrigerant leakage detection method for the air conditioner is implemented.

[0088] According to the computer-readable storage medium of the embodiments of the present invention, when the processor executes the refrigerant leakage detection program for the air conditioner, the above-mentioned refrigerant leakage detection method for the air conditioner is implemented. Even in the case of temperature sensor failure, refrigerant leakage detection function failure, and complete refrigerant leakage, it can ensure that the compressor will not run idly for a long time and cause burnout, ensuring the reliability of the compressor operation.

[0089] Corresponding to the above embodiments, the present invention also proposes an air conditioner.

[0090] As Figure 6 shown, the air conditioner 200 according to an embodiment of the present invention includes a memory 210, a processor 220, and a refrigerant leakage detection program for the air conditioner stored on the memory 210 and executable on the processor 220. When the processor 220 executes the refrigerant leakage detection program for the air conditioner, the above-mentioned refrigerant leakage detection method for the air conditioner is implemented.

[0091] According to the air conditioner of the embodiments of the present invention, when the processor executes the refrigerant leakage detection program for the air conditioner, the above-mentioned refrigerant leakage detection method for the air conditioner is implemented. Even in the case of temperature sensor failure, refrigerant leakage detection function failure, and complete refrigerant leakage, it can ensure that the compressor will not run idly for a long time and cause burnout, ensuring the reliability of the compressor operation.

[0092] Corresponding to the above embodiments, the present invention also proposes a refrigerant leakage detection device for an air conditioner.

[0093] As Figure 7 shown, the power estimation device for the outdoor unit controller of the air conditioner according to the embodiment of the present invention may include: an acquisition module 20 and a detection and control module 30.

[0094] Among them, the acquisition module 20 is used to obtain the first current value of the compressor at the current operating frequency when the compressor in the air conditioner is in a stable operating stage. The detection and control module 30 is used to adjust the operating frequency of the compressor when it is determined that the air conditioner meets the first preset condition according to the first current value, so that the compressor operates at the first target frequency and the second target frequency respectively. The acquisition module 20 is further used to obtain the second current value and the third current value when the compressor operates at the first target frequency and the second target frequency respectively. The detection and control module 30 is further used to determine the refrigerant leakage condition of the air conditioner according to the second current value and the third current value.

[0095] It should be noted that for the details not disclosed in the refrigerant leakage detection device of the air conditioner according to the embodiment of the present invention, please refer to the details disclosed in the refrigerant leakage detection method of the air conditioner in the above embodiment of the present invention, and will not be elaborated here specifically.

[0096] According to the refrigerant leakage detection device of the air conditioner according to the embodiment of the present invention, when the compressor in the air conditioner is in a stable operating stage, the acquisition module obtains the first current value of the compressor at the current operating frequency. When the detection and control module determines that the air conditioner meets the first preset condition according to the first current value, it adjusts the operating frequency of the compressor so that the compressor operates at the first target frequency and the second target frequency respectively. Then, the acquisition module obtains the second current value and the third current value when the compressor operates at the first target frequency and the second target frequency respectively. The detection and control module determines the refrigerant leakage condition of the air conditioner according to the second current value and the third current value. Thus, the device can accurately judge whether the refrigerant in the system leaks through a single parameter. Even when the temperature sensor fails and the refrigerant leakage detection function fails, and the refrigerant leaks completely, it can ensure that the compressor will not run idly for a long time and cause burnout, ensuring the reliability of the compressor operation.

[0097] Note that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or used in combination with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of the computer-readable medium include the following: an electrical connection part with one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or other suitable processing as necessary, and then stored in a computer memory.

[0098] It should be understood that various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits with logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits with suitable combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0099] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0100] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A refrigerant leakage detection method for an air conditioner, characterized in that, Including: When the compressor in the air conditioner is in a stable operation stage, obtaining a first current value of the compressor at the current operating frequency; When it is determined that the air conditioner meets a first preset condition according to the first current value, adjusting the operating frequency of the compressor so that the compressor operates at a first target frequency and a second target frequency respectively; Obtaining a second current value and a third current value when the compressor operates at the first target frequency and the second target frequency respectively; Determining the refrigerant leakage condition of the air conditioner according to the second current value and the third current value; Determining the refrigerant leakage condition of the air conditioner according to the second current value and the third current value, including: Determining a second target current value according to the indoor environmental temperature and the first target frequency, and determining a third target current value according to the indoor environmental temperature and the second target frequency; When the second current value is less than the second target current value, the third current value is less than the third target current value, and the current difference between the second current value and the third current value is less than a preset current threshold, determining that the refrigerant in the air conditioner leaks.

2. The method according to claim 1, characterized in that Determining that the air conditioner meets the first preset condition according to the first current value, including: Determining a first target current value according to the current indoor environmental temperature and the current operating frequency; When the first current value is less than the first target current value, determining that the air conditioner meets the first preset condition.

3. The method according to claim 1, wherein Adjusting the operating frequency of the compressor, including: Controlling the compressor to operate at the first target frequency, and controlling the compressor to operate at the second target frequency when the second current value is less than the second target current value.

4. The method according to any one of claims 1-3, characterized in that, The first target frequency is the highest operating frequency of the compressor, and the second target frequency is the lowest operating frequency of the compressor.

5. The method according to any one of claims 1 to 3, characterized in that, The first current value, the second current value and the third current value are all the average values of the compressor current within a preset time.

6. The method according to any one of claims 1 to 3, characterized in that The compressor in the air conditioner is in a stable operation stage, including: When the air conditioner operates in a cooling mode, obtaining the change rate of the operating frequency of the compressor; When the change rate of the operating frequency of the compressor is less than a preset threshold, determining that the compressor is in a stable operation stage.

7. A computer-readable storage medium, characterized in that, A refrigerant leakage detection program of the air conditioner is stored thereon, and when the refrigerant leakage detection program of the air conditioner is executed by a processor, the refrigerant leakage detection method of the air conditioner according to any one of claims 1-6 is implemented.

8. An air conditioner, characterized in that, Including a memory, a processor, and a refrigerant leakage detection program of the air conditioner stored on the memory and operable on the processor. When the processor executes the refrigerant leakage detection program of the air conditioner, the refrigerant leakage detection method of the air conditioner according to any one of claims 1-6 is implemented.

9. A refrigerant leakage detection device for an air conditioner, characterized in that, Including: An acquisition module, configured to obtain a first current value of the compressor at the current operating frequency when the compressor in the air conditioner is in a stable operation stage; The detection and control module is configured to adjust the operating frequency of the compressor when it is determined that the air conditioner meets the first preset condition according to the first current value, so that the compressor operates at a first target frequency and a second target frequency respectively; The acquisition module is further configured to acquire a second current value and a third current value when the compressor operates at the first target frequency and the second target frequency respectively; The detection and control module is further configured to determine the refrigerant leakage condition of the air conditioner according to the second current value and the third current value; Determining the refrigerant leakage condition of the air conditioner according to the second current value and the third current value includes: Determining a second target current value according to the indoor environmental temperature and the first target frequency, and determining a third target current value according to the indoor environmental temperature and the second target frequency; When the second current value is less than the second target current value, the third current value is less than the third target current value, and the current difference between the second current value and the third current value is less than a preset current threshold, it is determined that the refrigerant of the air conditioner leaks.

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