Air conditioner and fault detection method thereof, computer device and readable storage medium

Abstract

The present invention provides an air conditioner and a fault detection method thereof, a computer device and a readable storage medium. The fault detection method of the air conditioner comprises: step 1, obtaining air conditioning system parameters, the air conditioning system parameters include outdoor ambient temperature, indoor ambient temperature, compressor frequency, indoor heat exchanger pipe temperature, outdoor heat exchanger pipe temperature, indoor fan speed and outdoor fan speed; step 2, comparing the air conditioning system parameters with preset parameters, and calculating the current capacity state of the air conditioner to determine the cause of the air conditioner failure, the cause of the failure includes indoor heat exchanger dirty blockage, filter dirty blockage, indoor fan abnormality, outdoor fan abnormality, outdoor heat exchanger dirty blockage, and system pipeline abnormality. The fault detection method can automatically determine the cause of the air conditioning system failure based on the air conditioning system parameters, thereby improving the operating efficiency and reliability of the air conditioning system and reducing the frequency and difficulty of manual maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner and a fault detection method thereof, a computer device and a readable storage medium. Background Art

[0002] With the improvement of living standards in my country, household air conditioners as indoor air conditioning appliances have been widely used in consumers' homes. If the air conditioner fails to work properly, it will greatly affect the user experience and even affect the normal life of a family.

[0003] In the process of producing, installing and using air conditioners, various problems are inevitable. Air conditioners are often subjected to comprehensive inspection and testing during production, and only after they are confirmed to be qualified will they be put on the market. Due to the different air conditioner usage environments of users, the installation methods of the installers are also different. In fact, most of the problems of air conditioners are caused during the installation process.

[0004] Existing air conditioning systems mainly rely on manual adjustments by users and regular inspections by maintenance personnel to maintain their normal operation. However, it is often difficult to timely and accurately judge the working status of internal components of existing air conditioning systems, especially when abnormal conditions such as dirty heat exchangers, fan abnormalities, system pipe blockages (including dirty blockages and ice blockages), and lack of fluorine occur. Traditional inspection and maintenance methods are not only time-consuming and labor-intensive, but also unable to monitor and adjust in real time, resulting in reduced efficiency and shortened service life of the air conditioning system. Summary of the invention

[0005] The first object of the present invention is to provide a fault detection method that can automatically determine the cause of a fault in an air-conditioning system based on air-conditioning system parameters, thereby improving the operating efficiency and reliability of the air-conditioning system and reducing the frequency and difficulty of manual maintenance.

[0006] A second object of the present invention is to provide an air conditioner that implements the above-mentioned fault detection method.

[0007] A third object of the present invention is to provide a computer device for implementing the above-mentioned fault detection method.

[0008] A fourth object of the present invention is to provide a readable storage medium for implementing the above-mentioned fault detection method.

[0009] To achieve the above first purpose, the present invention provides a method for detecting faults of an air conditioner, comprising: step 1, obtaining air conditioning system parameters, the air conditioning system parameters including outdoor ambient temperature, indoor ambient temperature, compressor frequency, indoor heat exchanger tube temperature, outdoor heat exchanger tube temperature, indoor fan speed and outdoor fan speed; step 2, comparing the air conditioning system parameters with preset parameters, and calculating the current capacity state of the air conditioner to determine the cause of the air conditioner failure, the cause of the failure including indoor heat exchanger dirty blockage, filter dirty blockage, indoor fan abnormality, outdoor fan abnormality, outdoor heat exchanger dirty blockage, and system pipeline abnormality. Among them, step 2 includes: entering the cooling mode, setting the indoor fan speed S 内 =S1, set the compressor frequency F=F1, where S1 is the first preset speed and F1 is the first preset frequency; calculate the change rate of the indoor heat exchanger tube temperature per unit time △t IT / △T and the rate of change of indoor ambient temperature△t IE / △T, and judge whether △t is satisfied IT / △T=△t IE / △T=0; If so, enter the detection step.

[0010] It can be seen from the above scheme that the fault detection method of the air conditioner can be based on air conditioning system parameters such as outdoor ambient temperature, indoor ambient temperature, compressor frequency, indoor heat exchanger tube temperature, outdoor heat exchanger tube temperature, indoor fan speed and outdoor fan speed. By comparing the air conditioning system parameters with the preset parameters, the current capacity status of the air conditioner can be calculated, so as to judge the dirty and blocked conditions of the heat exchangers inside and outside the air conditioning system, the abnormal conditions of the indoor and outdoor fans, the blockage of the system pipelines and the lack of refrigerant, etc., so as to realize real-time judgment of the operating status of the air conditioning system, and be able to timely discover and handle various abnormal conditions, thereby improving the operating efficiency and reliability of the air conditioning system and reducing the frequency and difficulty of manual maintenance. At the same time, it reduces the damage to the air conditioning system caused by the failure to handle abnormal conditions in time, thereby extending the service life of the air conditioning system. In addition, the frequency of manual inspection and maintenance is reduced, the maintenance cost is reduced, and the user experience is improved. When △t is satisfied IT / △T=△t IE / △T=0, it means that the air conditioning system has stabilized. Entering the test step at this time can ensure the accuracy of the test results. IT / △T≠0 or △t IE / △T≠0, indicating that the air conditioning system is not stable yet. You need to wait and test again after the system is stable to improve the accuracy of fault judgment.

[0011] A further solution is that the detection step includes: calculating the current heat transfer index t of the indoor heat exchanger IT / t1×100%, and compare the current heat transfer index of the indoor heat exchanger with the lower limit a of the heat transfer index of the indoor heat exchanger, where t IT is the indoor heat exchanger tube temperature, t1 is the first preset temperature; if t IT / t1×100%≤a, the indoor unit is judged to be abnormal and enters the indoor unit abnormality diagnosis mode; if t IT / t1×100%>a, the indoor unit is judged to be normal and the current heat exchange index of the indoor heat exchanger is compared with the upper limit b of the heat exchange index of the indoor heat exchanger; if t IT / t1×100%≥b, the outdoor unit or system pipeline is judged to be abnormal, and the outdoor unit and system pipeline abnormality diagnosis mode is entered; if t IT / t1×100%<b, the air conditioner is judged to be fault-free.

[0012] It can be seen that, assuming that there is no abnormality in the outdoor unit and system pipelines, the larger the heat transfer index of the indoor heat exchanger, the better the current heat transfer condition of the indoor heat exchanger. IT / t1×100%≤a, indicating that the indoor heat exchanger is not fully heated, the indoor unit is abnormal, and the indoor unit enters the abnormal diagnosis mode; when the heat exchange index t IT / t1×100%>a, indicating that the indoor heat exchanger is relatively sufficient at this time, and the next judgment is entered, and the heat exchange index is compared with the upper limit b of the heat exchange index of the indoor heat exchanger. IT / t1×100%≥b, indicating that the indoor heat exchanger temperature is high at this time, it is judged that the indoor unit is abnormal or the air conditioning pipe system is blocked or lacks fluorine, and the outdoor unit enters the abnormal diagnosis mode; when the heat exchange index t IT / t1×100%<b, indicating that the air conditioner is in normal condition and has no faults, and the diagnostic mode is exited. By comparing the current heat exchange index of the indoor heat exchanger with the upper limit b and lower limit a of the heat exchange index of the indoor heat exchanger under ideal conditions, it is possible to more quickly locate whether the indoor unit or the outdoor unit is faulty, thereby improving the efficiency of fault diagnosis.

[0013] A further solution is that the indoor unit abnormality diagnosis mode includes: entering the cooling mode, adjusting the compressor frequency F=F2, and turning off the indoor fan, where F2 is the second preset frequency; calculating the change rate of the indoor heat exchanger tube temperature per unit time △t IT / △T and the rate of change of indoor ambient temperature△t IE / △T, and judge whether △t is satisfied IT / △T=△t IE / △T=0; if so, record the indoor heat exchanger tube temperature t IT =t IT1; Adjust the compressor frequency F=F3, and turn off the indoor fan, where F3 is the third preset frequency, F2<F3; Calculate the change rate of the indoor heat exchanger tube temperature per unit time △t IT / △T and the rate of change of indoor ambient temperature△t IE / △T, and judge whether △t is satisfied IT / △T=△t IE / △T=0; if so, record the indoor heat exchanger tube temperature t IT =t IT2 ; Calculate the indoor heat exchanger temperature rise index (t IT1 -t IT2 ) / △t1, and compare the indoor heat exchanger temperature rise index with the ideal indoor heat exchanger temperature rise index upper limit c, where △t1 is the ideal temperature difference of the indoor heat exchanger within a specific frequency; if (t IT1 -t IT2 ) / △t1>c, then the cause of the air conditioner failure is determined to be the dirty and blocked indoor heat exchanger; if (t IT1 -t IT2 ) / △t1≤c, it is determined that the cause of the air conditioner failure is a dirty filter or an abnormal indoor fan.

[0014] It can be seen that the indoor unit abnormality is generally caused by the indoor heat exchanger, filter blockage, abnormal indoor fan speed, etc. Calculate the indoor heat exchanger temperature rise index (t IT1 -t IT2 ) / △t1, and compared with the upper limit c of the temperature rise index of the ideal indoor heat exchanger. IT1 -t IT2 ) / △t1>c, indicating that within a specific frequency, the indoor pipe temperature changes greatly and is less affected by the indoor environment, indicating that the heat exchanger may be dirty and blocked, reminding the user to clean the indoor heat exchanger. If the air conditioner supports the self-cleaning function, the self-cleaning mode will be automatically turned on, and the diagnostic mode will be exited after the cleaning is completed; when (t IT1 -t IT2 ) / △t1≤c, indicating that within a specific frequency, the indoor pipe temperature change is within the normal range. The reason for the insufficient heat exchange of the indoor heat exchanger should be the abnormal air volume, reminding the user to clean the air conditioner filter.

[0015] A further solution is that after the step of determining that the cause of the air conditioner failure is a dirty or clogged indoor heat exchanger or a dirty or clogged filter, the fault detection method also includes the step of entering a self-cleaning mode; in the self-cleaning mode, if the cause of the failure is determined to be a dirty or clogged indoor heat exchanger, the indoor heat exchanger is cleaned; if the cause of the failure is determined to be a dirty or clogged filter, the filter is cleaned.

[0016] A further solution is that after the step of determining that the cause of the air conditioner failure is a dirty or clogged indoor heat exchanger, the indoor unit abnormality diagnosis mode also includes outputting a reminder signal that the indoor heat exchanger is dirty or clogged; and / or after the step of determining that the cause of the air conditioner failure is a dirty or clogged filter or an abnormal indoor fan, the indoor unit abnormality diagnosis mode also includes outputting a reminder signal that the filter is dirty or clogged.

[0017] A further solution is to enter the cooling mode, adjust the compressor frequency F=F2, and the step of shutting down the indoor fan also includes: the wind guide plates for sweeping up and down and sweeping left and right are both centered.

[0018] A preferred solution is to continue running the indoor unit abnormality diagnosis mode when the indoor heat exchanger and filter are cleaned for the first time, enter the cooling mode, and set the indoor fan speed S 内 =S1, set the compressor frequency F=F1; calculate the rate of change of the indoor heat exchanger tube temperature per unit time △t IT / △T and the rate of change of indoor ambient temperature△t IE / △T, and judge whether △t is satisfied IT / △T=△t IE / △T=0; if so, calculate the current heat transfer index t of the indoor heat exchanger IT / t1×100%, and compare the current heat transfer index of the indoor heat exchanger with the lower limit a of the heat transfer index of the indoor heat exchanger; if t IT / t1×100%≤a, then the cause of the air conditioner failure is determined to be an abnormal indoor fan; if t IT / t1×100%>a, the indoor unit is judged to be normal and the indoor unit abnormality diagnosis mode is exited.

[0019] It can be seen that after the indoor heat exchanger and filter are cleaned, the problem of dirt and blockage of the indoor heat exchanger and filter is ruled out. If the indoor heat exchange is still lower than a certain value, it means that it is caused by abnormal indoor fan speed.

[0020] A preferred solution is that the outdoor unit and system pipeline abnormality diagnosis mode includes: entering the cooling mode, setting the compressor frequency F=F4, setting the indoor fan speed S 内 = S2, the outdoor fan is turned off, where F4 is the fourth preset frequency and S2 is the second preset speed; calculate the change rate of the outdoor heat exchanger tube temperature per unit time △t OT / △T and the rate of change of outdoor ambient temperature△t OE / △T, and judge whether △t is satisfied OT / △T=△t OE / △T=0; if so, record the outdoor heat exchanger tube temperature t OT =t OT1 ; Adjust the compressor frequency F=F5, set the indoor fan speed S 内=S3, the outdoor fan is turned off, where F5 is the fifth preset frequency, F4>F5, and S3 is the third preset speed; calculate the change rate of the outdoor heat exchanger tube temperature per unit time △t OT / △T and the rate of change of outdoor ambient temperature△t OE / △T, and judge whether △t is satisfied OT / △T=△t OE / △T=0; if so, record the outdoor heat exchanger tube temperature t OT =t OT2 ; Calculate the outdoor heat exchanger temperature rise index (t OT1 -t OT2 ) / △t2, △t2 is the ideal temperature difference of the outdoor heat exchanger within a specific frequency, and the temperature rise index of the outdoor heat exchanger is compared with the upper limit d of the ideal outdoor heat exchanger temperature rise index; if (t OT1 -t OT2 ) / △t2≤d, it is determined that the cause of the air conditioner failure is abnormality of the system pipeline; if (t OT1 -t OT2 ) / △t2>d, it is determined that the cause of the air conditioner failure is the outdoor heat exchanger being dirty or the outdoor fan being abnormal.

[0021] It can be seen that the outdoor unit abnormalities are generally caused by the outdoor heat exchanger being dirty or blocked, the outdoor fan speed being abnormal, the air conditioning system pipe being blocked, and the lack of fluorine. OT1 -t OT2 ) / △t2, and compared with the upper limit d of the ideal outdoor heat exchanger temperature rise index, when (t OT1 -t OT2 ) / △t2≤d, indicating that within a specific frequency, the indoor pipe temperature changes little, causing the abnormal air conditioning capacity to be caused by abnormal air conditioning pipes (lack of fluorine, system blockage), reminding users to contact professionals / after-sales personnel for repair; when (t OT1 -t OT2 ) / △t2>d, indicating that within a specific frequency, the outdoor pipe temperature changes greatly and is less affected by the outdoor environment, indicating that the heat exchanger may be dirty and blocked, reminding the user to clean the outdoor heat exchanger.

[0022] A further solution is to start the outdoor heat exchanger for the first time after cleaning, and continue to run the outdoor unit and system pipeline abnormality diagnosis mode; enter the cooling mode, adjust the compressor frequency F=F5, and set the indoor fan speed S 内 =S4, where S4 is the fourth preset speed; calculate the rate of change of the outdoor heat exchanger tube temperature per unit time △t OT / △T and the rate of change of outdoor ambient temperature△t OE / △T, and judge whether △t is satisfied OT / △T=△t OE / △T=0; if so, calculate the current heat transfer index t of the outdoor heat exchanger OT / t2×100%, and compare the current heat transfer index of the outdoor heat exchanger with the upper limit e of the heat transfer index of the outdoor heat exchanger, where t2 is the second preset temperature; if t OT / t2×100%>e, then the cause of the air conditioner failure is determined to be an abnormal outdoor fan; if t OT / t2×100%≤e, the outdoor unit is judged to be normal and the outdoor unit and system pipeline abnormality diagnosis mode is exited.

[0023] It can be seen that after the outdoor heat exchanger is cleaned, the problem of outdoor heat exchanger being dirty and blocked is ruled out. If the outdoor heat exchange is still higher than a certain value, it means that the outdoor fan speed is abnormal. The smaller the heat exchange index of the outdoor unit, the better the heat exchange of the current air conditioner.

[0024] To achieve the above second objective, the present invention provides an air conditioner, the air conditioner comprising a processor, the processor being configured to implement the above fault detection method when executing a program stored in a memory.

[0025] To achieve the third objective, the present invention provides a computer device, which includes a processor, and the processor is used to implement the above-mentioned fault detection method when executing a program stored in a memory.

[0026] To achieve the fourth objective, the present invention provides a readable storage medium having a program stored thereon, and the program implements the above-mentioned fault detection method when executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 1 is a system block diagram of an air conditioner embodiment of the present invention.

[0028] Figure 2 It is a flow chart of an embodiment of the fault detection method of the present invention.

[0029] Figure 3 It is a specific flow chart of step S2 in the fault detection method embodiment of the present invention.

[0030] Figure 4 It is the first part of the flow chart of the indoor unit abnormality diagnosis mode in the fault detection method embodiment of the present invention.

[0031] Figure 5 It is the second part of the flow chart of the indoor unit abnormality diagnosis mode in the fault detection method embodiment of the present invention.

[0032] Figure 6 It is the first part of the flow chart of the outdoor unit and system pipeline abnormality diagnosis mode in the fault detection method embodiment of the present invention.

[0033] Figure 7It is the second part of the flow chart of the outdoor unit and system pipeline abnormality diagnosis mode in the fault detection method embodiment of the present invention.

[0034] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0035] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limitations.

[0036] The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] In the present invention, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0038] All terms (including technical terms or scientific terms) used in the present invention have the same meanings as those understood by ordinary technicians in the field, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0039] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0040] Air conditioner and fault detection method thereof embodiment:

[0041] See also Figure 1 The air conditioner of this embodiment includes an outdoor unit 10 and an indoor unit 20 connected to each other, the indoor unit 20 includes an air conditioner housing (not shown) and an indoor heat exchanger 1, an indoor fan 2 and a processor located in the air conditioner housing, and the outdoor unit 10 includes an outdoor heat exchanger 3, a throttling device 4, a compressor 5 and an outdoor fan 6. The throttling device 4 can be a capillary tube or an electronic expansion valve.

[0042] The compressor 5, the indoor heat exchanger 1, the outdoor heat exchanger 3 and the throttling device 4 form a refrigerant circulation system, the indoor fan 2 is arranged near the indoor heat exchanger 1, the outdoor fan 6 is arranged near the outdoor heat exchanger 3, the air inlet and the air outlet are arranged on the air conditioner housing of the indoor unit 20, and a filter (not shown) is arranged near the air inlet. The processor is used to implement the following fault detection method when executing the program stored in the memory.

[0043] When the air conditioner runs for a certain period of time or the user actively selects it through the remote control, it enters the diagnosis mode. When the diagnosis mode is exited, the air conditioner running time is cleared and restarted.

[0044] See also Figure 2 The air conditioner fault detection method of this embodiment includes the following steps:

[0045] Step S1, after entering the diagnostic mode, obtain the air conditioning system parameters, the air conditioning system parameters include the outdoor environment temperature t OE , Indoor ambient temperature t IE , compressor frequency F, indoor heat exchanger tube temperature t IT , Outdoor heat exchanger tube temperature t OT , Indoor fan speed S 内 and outdoor fan speed S 外 .

[0046] Step S2, compare the air conditioning system parameters with the preset parameters obtained during the production test of the air conditioner, and calculate the current capacity state of the air conditioner, which mainly includes the heat exchange capacity of the indoor heat exchanger and the heat exchange capacity of the outdoor heat exchanger. The heat exchange capacity of the indoor heat exchanger in this embodiment is determined by the indoor heat exchanger temperature rise index and the heat exchange index of the indoor heat exchanger, and the heat exchange capacity of the outdoor heat exchanger is determined by the outdoor heat exchanger temperature rise index and the heat exchange index of the outdoor heat exchanger. The current capacity state of the air conditioner is used to determine the cause of the air conditioner failure, and the cause of the failure includes indoor heat exchanger dirty blockage, filter dirty blockage, indoor fan abnormality, outdoor fan abnormality, outdoor heat exchanger dirty blockage, and system pipeline abnormality. Dirty blockage of the heat exchanger refers to the long use time of the heat exchanger, which causes dust, dirt, etc. to adhere to the surface of the heat exchanger, resulting in obstruction of air circulation and affecting heat exchange, etc. System pipeline abnormality usually includes ice blockage or lack of fluorine, etc. Ice blockage refers to local freezing inside the pipeline, which hinders the flow of refrigerant.

[0047] The above method makes it easy for users to understand the condition of the air conditioner. When a problem occurs, they can promptly notify maintenance personnel to handle it, or improve the performance of the air conditioner through simple methods such as cleaning the filter and cleaning the heat exchanger.

[0048] See also Figure 3 , the above step S2 specifically includes the following steps:

[0049] First, execute step S21 to enter the cooling mode and set the indoor fan speed S 内 =S1, set the compressor frequency F=F1, the air guide plates for upward and downward sweeping and left and right sweeping are both in the middle, where S1 is the first preset speed, which is the optimal indoor fan speed tested under the current indoor and outdoor environments, and is preset during the design and production of the air conditioner, and F1 is the first preset frequency, which is the optimal frequency tested under the current indoor and outdoor environments, and is preset during the design and production of the air conditioner.

[0050] Next, step S22 is executed to calculate the change rate Δt of the indoor heat exchanger tube temperature per unit time. IT / △T and the rate of change of indoor ambient temperature△t IE / △T, and judge whether △t is satisfied IT / △T=△t IE / △T=0.

[0051] If not, when △t IT / △T≠0 or △t IE / △T≠0, indicating that the air conditioning system is not stable yet and needs to continue waiting.

[0052] If so, when △t IT / △T=△t IE / △T=0, indicating that the air conditioning system has stabilized, and then enter the following detection steps.

[0053] The detection steps include:

[0054] First, execute step S23 to calculate the current heat transfer index t of the indoor heat exchanger 1. IT / t1×100%, and compare the current heat transfer index of indoor heat exchanger 1 with the lower limit a of the heat transfer index of indoor heat exchanger 1. IT is the indoor heat exchanger pipe temperature, t1 is the first preset temperature, which is the ideal indoor heat exchanger pipe temperature of the air conditioner under the current system parameters, preset when the air conditioner is designed and produced, and is related to the current indoor and outdoor ambient temperature, compressor frequency, and indoor and outdoor fan speed. Assuming that there is no abnormality in the outdoor unit 10 and the system pipeline, the larger the heat exchange index of the indoor heat exchanger 1, the better the heat exchange condition of the current indoor heat exchanger. Optionally, the value of the lower limit a of the heat exchange index of the indoor heat exchanger 1 is 95%, which is preset when the air conditioner is designed and produced.

[0055] IfIT / t1×100%≤a, indicating that the indoor heat exchanger 1 is not sufficiently exchanging heat at this time, then step S24 is executed to determine that the indoor unit is abnormal and enter the indoor unit abnormality diagnosis mode.

[0056] If IT / t1×100%>a, indicating that the indoor heat exchanger 1 is sufficiently exchanging heat at this time, then step S25 is executed to determine that the indoor unit 20 is normal, and then step S26 is executed to compare the current heat exchange index of the indoor heat exchanger 1 with the upper limit b of the heat exchange index of the indoor heat exchanger 1. Optionally, the value of the upper limit b of the heat exchange index of the indoor heat exchanger 1 is 105%, which is preset when the air conditioner is designed and produced.

[0057] If IT / t1×100%≥b, indicating that the temperature of the indoor heat exchanger 1 is relatively high at this time, step S27 is executed to determine that the outdoor unit 10 is abnormal or the system pipeline is abnormal, such as the air conditioning pipeline system is blocked or lacks fluorine, and enter the outdoor unit and system pipeline abnormality diagnosis mode.

[0058] If IT / t1×100%<b, indicating that the air conditioner is in normal condition at this time, then step S28 is executed to determine that the air conditioner has no faults and exit the diagnosis mode.

[0059] Indoor unit abnormalities are generally caused by indoor heat exchanger 1 being dirty or clogged, filter being dirty or clogged, and indoor fan 2 speed being abnormal. Figure 4 , the indoor unit abnormality diagnosis mode includes the following steps:

[0060] First, execute step S31, enter the cooling mode, adjust the compressor frequency F=F2, and turn off the indoor fan 2, wherein F2 is the second preset frequency, which is the optimal frequency lower limit tested under the current indoor and outdoor environment, and is preset during the design and production of the air conditioner. The optimal frequency is determined within a set range, and its lower limit is defined as the lowest frequency that can fully manifest the fault characteristics under a specific control logic, while the upper limit is selected to ensure that it is not higher than the maximum frequency of the compressor 5. For the purpose of energy saving and to reduce the operating noise in the air-conditioning diagnostic mode to improve user satisfaction, the lower limit of this interval is used here as the optimal frequency.

[0061] Next, step S32 is executed to calculate the change rate Δt of the indoor heat exchanger tube temperature per unit time. IT / △T and the rate of change of indoor ambient temperature△t IE / △T, and judge whether △t is satisfied IT / △T=△t IE / △T=0.

[0062] If not, it means that the air conditioning system is not stable yet and you need to wait.

[0063] If yes, it means that the air conditioning system has stabilized at this time, then step S33 is executed to record the indoor heat exchanger tube temperature t IT =t IT1 .

[0064] Next, execute step S34 to adjust the compressor frequency F=F3, and turn off the indoor fan 2, wherein F3 is the third preset frequency, which is the optimal frequency upper limit value tested under the current indoor and outdoor environment and is preset during the design and production of the air conditioner, F2<F3.

[0065] Next, step S35 is executed to calculate the change rate Δt of the indoor heat exchanger tube temperature per unit time. IT / △T and the rate of change of indoor ambient temperature△t IE / △T, and judge whether △t is satisfied IT / △T=△t IE / △T=0.

[0066] If not, it means that the air conditioning system is not stable yet and you need to wait.

[0067] If yes, it means that the air conditioning system has stabilized at this time, then step S36 is executed to record the indoor heat exchanger tube temperature t IT =t IT2 .

[0068] Next, step S37 is executed to calculate the temperature rise index (t IT1 -t IT2 ) / △t1, and compare the indoor heat exchanger temperature rise index with the ideal indoor heat exchanger temperature rise index upper limit c, where △t1 is the ideal temperature difference value of the indoor heat exchanger 1 within a specific frequency, which is preset during the design and production of the air conditioner, and reflects the temperature drop of the indoor heat exchanger 1 within a specific frequency under the ideal state of the air conditioner. This value is related to the current indoor and outdoor ambient temperature, compressor frequency, and outdoor fan speed.

[0069] If (t IT1 -t IT2 ) / △t1>c, indicating that within a specific frequency, the indoor pipe temperature changes greatly and is less affected by the indoor environment, indicating that the heat exchanger may be dirty and blocked. Then, step S38 is executed to determine that the cause of the air conditioner failure is the dirty and blocked indoor heat exchanger, and an indoor heat exchanger dirty and blocked reminder signal is output to remind the user to clean the indoor heat exchanger 1.

[0070] If (t IT1 -t IT2) / △t1≤c, indicating that within a specific frequency, the indoor pipe temperature change is within the normal range, and the reason for the insufficient heat exchange of the indoor heat exchanger 1 should be due to abnormal air volume, then step S39 is executed to determine that the cause of the air conditioner failure is a dirty filter or an abnormal indoor fan, and a reminder signal of a dirty filter is output to remind the user to clean the air conditioner filter.

[0071] See also Figure 5 , wait for the indoor heat exchanger 1 and filter to be cleaned and then turned on for the first time, and continue to run the indoor unit abnormality diagnosis mode.

[0072] First, execute step S41 to enter the cooling mode and set the indoor fan speed S 内 =S1, set the compressor frequency F=F1, and the air guide plates for upper and lower sweeps and left and right sweeps are centered.

[0073] Next, step S42 is executed to calculate the change rate Δt of the indoor heat exchanger tube temperature per unit time. IT / △T and the rate of change of indoor ambient temperature△t IE / △T, and judge whether △t is satisfied IT / △T=△t IE / △T=0.

[0074] If not, it means that the air conditioning system is not stable yet and you need to wait.

[0075] If yes, it means that the air conditioning system has stabilized at this time, then step S43 is executed to calculate the current heat transfer index t of the indoor heat exchanger 1. IT / t1×100%, and compare the current heat exchange index of the indoor heat exchanger 1 with the lower limit a of the heat exchange index of the indoor heat exchanger 1 again.

[0076] If IT / t1×100%≤a, indicating that the abnormal heat exchange problem of the indoor unit 20 is still not resolved, then executing step S44, determining that the cause of the air conditioner failure is the abnormal indoor fan, and outputting a reminder signal of the abnormal indoor fan to remind the user to contact a professional / after-sales personnel for repair.

[0077] If IT / t1×100%>a, indicating that the heat exchange of the indoor heat exchanger 1 has returned to normal, then step S45 is executed to determine that the indoor unit 20 is normal and exit the indoor unit abnormality diagnosis mode.

[0078] The outdoor unit abnormality is generally caused by the outdoor heat exchanger 3 being dirty and blocked, the outdoor fan 6 speed being abnormal, the air conditioning system pipeline being blocked, and the lack of fluorine. Figure 6 , the outdoor unit and system pipeline abnormality diagnosis mode includes the following steps:

[0079] First, execute step S51 to enter the cooling mode, set the compressor frequency F=F4, and set the indoor fan speed S 内 =S2, the outdoor fan 6 is turned off, wherein F4 is the fourth preset frequency, which is the optimal frequency upper limit tested under the current indoor and outdoor environment, and is preset when the air conditioner is designed and produced; S2 is the second preset speed, which is the optimal indoor fan speed tested under the current indoor and outdoor environment, and is preset when the air conditioner is designed and produced.

[0080] Next, step S52 is executed to calculate the change rate Δt of the outdoor heat exchanger tube temperature per unit time. OT / △T and the rate of change of outdoor ambient temperature△t OE / △T, and judge whether △t is satisfied OT / △T=△t OE / △T=0.

[0081] If not, it means that the air conditioning system is not stable yet and you need to wait.

[0082] If yes, it means that the air conditioning system has stabilized at this time, then step S53 is executed to record the outdoor heat exchanger tube temperature t OT =t OT1 .

[0083] Next, execute step S54 to adjust the compressor frequency F=F5 and set the indoor fan speed S 内 =S3, the outdoor fan 6 is turned off, wherein F5 is the fifth preset frequency, which is the optimal frequency lower limit tested under the current indoor and outdoor environment, and is preset when the air conditioner is designed and produced. F4>F5, S3 is the third preset speed, which is the optimal indoor fan speed tested under the current indoor and outdoor environment, and is preset when the air conditioner is designed and produced.

[0084] Next, step S55 is executed to calculate the change rate Δt of the outdoor heat exchanger tube temperature per unit time. OT / △T and the rate of change of outdoor ambient temperature△t OE / △T, and judge whether △t is satisfied OT / △T=△t OE / △T=0.

[0085] If not, it means that the air conditioning system is not stable yet and you need to wait.

[0086] If yes, it means that the air conditioning system has stabilized at this time, then step S56 is executed to record the outdoor heat exchanger tube temperature t OT =t OT2 .

[0087] Next, step S57 is executed to calculate the outdoor heat exchanger temperature rise index (t OT1 -t OT2) / △t2, and compare the outdoor heat exchanger temperature rise index with the ideal outdoor heat exchanger temperature rise index upper limit d. △t2 is the ideal temperature difference value of the outdoor heat exchanger 3 within a specific frequency, which is preset during the design and production of the air conditioner, reflecting the temperature drop of the outdoor heat exchanger 3 within a specific frequency under the ideal state of the air conditioner. This value is related to the current indoor and outdoor ambient temperature, compressor frequency, and indoor fan speed.

[0088] If (t OT1 -t OT2 ) / △t2≤d, indicating that within a specific frequency, the indoor pipe temperature changes little, and the abnormal air conditioning capacity may be caused by abnormal air conditioning pipelines (lack of fluorine, system blockage), then step S58 is executed to determine that the cause of the air conditioner failure is abnormal system pipelines, and a reminder signal of abnormal system pipelines is output to remind the user to contact professionals / after-sales personnel for repair and processing;

[0089] If (t OT1 -t OT2 ) / △t2>d, indicating that within a specific frequency, the outdoor pipe temperature changes greatly and is less affected by the outdoor environment, indicating that the heat exchanger may be dirty and blocked. Then, step S59 is executed to determine that the cause of the air conditioner failure is the dirtiness and blockage of the outdoor heat exchanger or the abnormality of the outdoor fan, and an outdoor heat exchanger dirty and blocked reminder signal is output to remind the user to clean the outdoor heat exchanger 3.

[0090] See also Figure 7 , wait for the outdoor heat exchanger 3 to be turned on for the first time after cleaning, and continue to run the outdoor unit and system pipeline abnormality diagnosis mode.

[0091] First, execute step S61, enter the cooling mode, adjust the compressor frequency F=F5, set the indoor fan speed S 内 =S4, the air guide plates for sweeping air up and down and left and right are both in the middle, where S4 is the fourth preset speed, which is the optimal indoor fan speed tested under the current indoor and outdoor environment and is preset during the design and production of the air conditioner.

[0092] Next, step S62 is executed to calculate the change rate Δt of the outdoor heat exchanger tube temperature per unit time. OT / △T and the rate of change of outdoor ambient temperature△t OE / △T, and judge whether △t is satisfied OT / △T=△t OE / △T=0.

[0093] If not, it means that the air conditioning system is not stable yet and you need to wait.

[0094] If yes, it means that the air conditioning system has stabilized at this time, then step S63 is executed to calculate the current heat transfer index t of the outdoor heat exchanger 3. OT / t2×100%, and compare the current heat exchange index of the outdoor heat exchanger 3 with the upper limit e of the heat exchange index of the outdoor heat exchanger 3, where t2 is the second preset temperature, which is the ideal outdoor heat exchanger pipe temperature of the air conditioner under the current system parameters, preset during the design and production of the air conditioner, and is related to the current indoor and outdoor ambient temperature, compressor frequency, and indoor and outdoor fan speed. The smaller the heat exchange index of the outdoor heat exchanger 3, the better the heat exchange condition of the current air conditioner.

[0095] If OT / t2×100%>e, indicating that the abnormal heat exchange problem of the outdoor unit 10 has not been solved, then executing step S64, determining that the cause of the air conditioner failure is the abnormal outdoor fan, and outputting a reminder signal of the outdoor fan abnormality to remind the user to contact professionals / after-sales personnel for repair and processing.

[0096] If OT / t2×100%≤e, indicating that the heat exchange of the outdoor heat exchanger 3 has returned to normal, then step S65 is executed to determine that the outdoor unit 10 is normal and exit the outdoor unit and system pipeline abnormality diagnosis mode.

[0097] As can be seen from the above, the fault detection method of the air conditioner can be based on air conditioning system parameters such as outdoor ambient temperature, indoor ambient temperature, compressor frequency, indoor heat exchanger tube temperature, outdoor heat exchanger tube temperature, indoor fan speed and outdoor fan speed. By comparing the air conditioning system parameters with the preset parameters, the current capacity state of the air conditioner can be calculated, so as to judge the dirty and blocked conditions of the heat exchangers inside and outside the air conditioning system, the abnormal conditions of the indoor and outdoor fans, the blockage of the system pipelines and the lack of refrigerant, etc., so as to realize the real-time judgment of the operating status of the air conditioning system, and be able to timely discover and handle various abnormal conditions, thereby improving the operating efficiency and reliability of the air conditioning system and reducing the frequency and difficulty of manual maintenance. At the same time, it reduces the damage to the air conditioning system caused by the failure to handle abnormal conditions in time, thereby extending the service life of the air conditioning system. In addition, it reduces the frequency of manual inspection and maintenance, reduces maintenance costs, and improves the user experience.

[0098] In addition, if the air conditioner supports a self-cleaning function, the self-cleaning mode is automatically turned on, and in the self-cleaning mode, the indoor heat exchanger or filter is cleaned, and after the cleaning is completed, the diagnostic mode is exited. The above changes can also achieve the purpose of the present invention.

[0099] Computer device embodiment:

[0100] The computer device of the present invention is a controller, including a processor and a memory, such as a single chip microcomputer including a central processing unit, etc. Moreover, the processor is used to implement the steps of the above fault detection method when executing a computer program stored in the memory.

[0101] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0102] The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0103] Computer readable storage medium embodiment:

[0104] The computer-readable storage medium of the present invention can be any form of storage medium that can be read by a processor of a computer device, including but not limited to non-volatile memory, volatile memory, ferroelectric memory, etc. A computer program is stored on the computer-readable storage medium. When the processor of the computer device reads and executes the computer program stored in the memory, the steps of the above-mentioned fault detection method can be implemented.

[0105] A computer program includes computer program code, which may be in source code form, object code form, executable file or some intermediate form, etc. Computer readable media may include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer readable media do not include electric carrier signals and telecommunication signals.

[0106] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for detecting a fault in an air conditioner, characterized in that: include: Step 1, obtaining air conditioning system parameters, wherein the air conditioning system parameters include outdoor ambient temperature, indoor ambient temperature, compressor frequency, indoor heat exchanger tube temperature, outdoor heat exchanger tube temperature, indoor fan speed, and outdoor fan speed; Step 2, comparing the air conditioning system parameters with preset parameters, and calculating the current capacity status of the air conditioner to determine the cause of the air conditioner failure, wherein the cause of the failure includes indoor heat exchanger clogging, filter clogging, indoor fan abnormality, outdoor fan abnormality, outdoor heat exchanger clogging, and system pipeline abnormality; Wherein, the step 2 comprises: Enter cooling mode and set the indoor fan speed S 内 =S1, set the compressor frequency F=F1, where S1 is the first preset speed and F1 is the first preset frequency; Calculate the rate of change of indoor heat exchanger tube temperature per unit time △t IT / △T and the rate of change of indoor ambient temperature△t IE / △T, and judge whether △t is satisfied IT / △T=△t IE / △T=0; If yes, proceed to the detection step.

2. The fault detection method according to claim 1, characterized in that: The detection step comprises: Calculate the current heat transfer index t of the indoor heat exchanger IT / t1×100%, and compare the current heat transfer index of the indoor heat exchanger with the lower limit a of the heat transfer index of the indoor heat exchanger, where t IT is the indoor heat exchanger tube temperature, t1 is the first preset temperature; If IT / t1×100%≤a, the indoor unit is judged to be abnormal and enters the indoor unit abnormality diagnosis mode; If IT / t1×100%>a, the indoor unit is judged to be normal and the current heat exchange index of the indoor heat exchanger is compared with the upper limit b of the heat exchange index of the indoor heat exchanger; If IT / t1×100%≥b, the outdoor unit or system pipeline is judged to be abnormal, and the outdoor unit and system pipeline abnormality diagnosis mode is entered; If IT / t1×100%<b, the air conditioner is judged to be fault-free.

3. The fault detection method according to claim 2, characterized in that: The indoor unit abnormality diagnosis mode includes: Enter cooling mode, adjust the compressor frequency F=F2, and turn off the indoor fan, where F2 is the second preset frequency; Calculate the rate of change of indoor heat exchanger tube temperature per unit time △t IT / △T and the rate of change of indoor ambient temperature△t IE / △T, and judge whether △t is satisfied IT / △T=△t IE / △T=0; If yes, then record the indoor heat exchanger tube temperature t IT =t IT1 ; Adjust the compressor frequency F=F3, and turn off the indoor fan, where F3 is the third preset frequency and F2<F3; Calculate the rate of change of indoor heat exchanger tube temperature per unit time △t IT / △T and the rate of change of indoor ambient temperature△t IE / △T, and judge whether △t is satisfied IT / △T=△t IE / △T=0; If yes, then record the indoor heat exchanger tube temperature t IT =t IT2 ; Calculate the indoor heat exchanger temperature rise index (t IT1 -t IT2 ) / △t1, and compare the temperature rise index of the indoor heat exchanger with the upper limit c of the ideal indoor heat exchanger temperature rise index, where △t1 is the ideal temperature difference value of the indoor heat exchanger within a specific frequency; If (t IT1 -t IT2 ) / △t1>c, it is determined that the cause of the air conditioner failure is the dirty blockage of the indoor heat exchanger; If (t IT1 -t IT2 ) / △t1≤c, it is determined that the cause of the air conditioner failure is a dirty filter or an abnormal indoor fan.

4. The fault detection method according to claim 3, characterized in that: After determining that the cause of the air conditioner failure is a dirty blockage of the indoor heat exchanger or a dirty blockage of the filter, the fault detection method further includes the step of entering a self-cleaning mode; In the self-cleaning mode, if it is determined that the cause of the fault is that the indoor heat exchanger is dirty and clogged, the indoor heat exchanger is cleaned; if it is determined that the cause of the fault is that the filter is dirty and clogged, the filter is cleaned.

5. The fault detection method according to claim 3, characterized in that: After determining that the cause of the air conditioner failure is that the indoor heat exchanger is dirty or clogged, the indoor unit abnormality diagnosis mode further includes outputting a reminder signal of the indoor heat exchanger being dirty or clogged; and / or After determining that the cause of the air conditioner failure is that the filter is dirty or clogged or the indoor fan is abnormal, the indoor unit abnormality diagnosis mode further includes outputting a reminder signal of the filter being dirty or clogged.

6. The fault detection method according to any one of claims 3 to 5, characterized in that: Entering the cooling mode, adjusting the compressor frequency F=F2, and shutting down the indoor fan also include: The wind guide plates for sweeping the air up and down and sweeping the air left and right are both centered.

7. The fault detection method according to any one of claims 3 to 5, characterized in that: The indoor heat exchanger and the filter are started up for the first time after being cleaned, and the indoor unit abnormality diagnosis mode is continued to be operated; Enter cooling mode and set the indoor fan speed S 内 =S1, set compressor frequency F=F1; Calculate the rate of change of indoor heat exchanger tube temperature per unit time △t IT / △T and the rate of change of indoor ambient temperature△t IE / △T, and judge whether △t is satisfied IT / △T=△t IE / △T=0; If so, calculate the current heat transfer index t of the indoor heat exchanger IT / t1×100%, and comparing the current heat exchange index of the indoor heat exchanger with the lower limit a of the heat exchange index of the indoor heat exchanger; If IT / t1×100%≤a, then the cause of the air conditioner failure is determined to be an abnormal indoor fan; If IT / t1×100%>a, the indoor unit is determined to be normal and the indoor unit abnormality diagnosis mode is exited.

8. The fault detection method according to any one of claims 2 to 5, characterized in that: The outdoor unit and system pipeline abnormality diagnosis mode includes: Enter cooling mode, set the compressor frequency F=F4, set the indoor fan speed S 内 =S2, the outdoor fan is turned off, where F4 is the fourth preset frequency and S2 is the second preset speed; Calculate the rate of change of the outdoor heat exchanger tube temperature per unit time △t OT / △T and the rate of change of outdoor ambient temperature△t OE / △T, and judge whether △t is satisfied OT / △T=△t OE / △T=0; If yes, then record the outdoor heat exchanger tube temperature t OT =t OT1 ; Adjust the compressor frequency F=F5 and set the indoor fan speed S 内 =S3, the outdoor fan is turned off, wherein F5 is the fifth preset frequency, F4>F5, and S3 is the third preset speed; Calculate the rate of change of the outdoor heat exchanger tube temperature per unit time △t OT / △T and the rate of change of outdoor ambient temperature△t OE / △T, and judge whether △t is satisfied OT / △T=△t OE / △T=0; If yes, then record the outdoor heat exchanger tube temperature t OT =t OT2 ; Calculate the outdoor heat exchanger temperature rise index (t OT1 -t OT2 ) / △t2, △t2 is the ideal temperature difference of the outdoor heat exchanger within a specific frequency, and the temperature rise index of the outdoor heat exchanger is compared with the upper limit d of the ideal outdoor heat exchanger temperature rise index; If (t OT1 -t OT2 ) / △t2≤d, it is determined that the cause of the air conditioner failure is abnormality of the system pipeline; If (t OT1 -t OT2 ) / △t2>d, it is determined that the cause of the air conditioner failure is the outdoor heat exchanger being dirty or the outdoor fan being abnormal.

9. The fault detection method according to claim 8, characterized in that: The outdoor heat exchanger is started up for the first time after cleaning, and the outdoor unit and system pipeline abnormality diagnosis mode is continued to be operated; Enter cooling mode, adjust the compressor frequency F=F5, and set the indoor fan speed S 内 =S4, wherein S4 is the fourth preset speed; Calculate the rate of change of the outdoor heat exchanger tube temperature per unit time △t OT / △T and the rate of change of outdoor ambient temperature△t OE / △T, and judge whether △t is satisfied OT / △T=△t OE / △T=0; If so, calculate the current heat transfer index t of the outdoor heat exchanger OT / t2×100%, and compare the current heat exchange index of the outdoor heat exchanger with the upper limit e of the heat exchange index of the outdoor heat exchanger, wherein t2 is the second preset temperature; If OT / t2×100%>e, then the cause of the air conditioner failure is determined to be an abnormal outdoor fan; If OT / t2×100%≤e, the outdoor unit is determined to be normal and the outdoor unit and system pipeline abnormality diagnosis mode is exited.

10. An air conditioner, characterized in that: The air conditioner comprises a processor, and the processor is used to implement the fault detection method according to any one of claims 1 to 9 when executing a program stored in a memory.

11. A computer device, characterized in that: The computer device comprises a processor, and the processor is used to implement the fault detection method according to any one of claims 1 to 9 when executing a program stored in a memory.

12. A readable storage medium having a program stored thereon, characterized in that: When the program is executed by a processor, the fault detection method according to any one of claims 1 to 9 is implemented.

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