Air conditioner fault detection method, air conditioner and readable storage medium

Abstract

This application discloses a fault detection method for an air conditioner, an air conditioner, and a storage medium. The method includes: controlling the air conditioner to operate in a preset mode according to a first parameter, acquiring the fan outlet temperature and ambient temperature; determining the switching state of a four-way valve based on the outlet temperature and ambient temperature; if the four-way valve is in an abnormal switching state, controlling the air conditioner to operate in the preset mode according to a second parameter; if the four-way valve is in an abnormal switching state while the air conditioner is operating in the preset mode according to the second parameter, acquiring the output power of the air conditioner; and determining that the four-way valve has malfunctioned when the output power meets a preset condition. This method, when determining that the four-way valve is in an abnormal switching state based on the outlet temperature and ambient temperature, further judges whether the four-way valve has malfunctioned by considering the compressor's operating frequency and the air conditioner's output power. This avoids the problem of misjudgment that can easily occur when using pipe temperature to detect whether the air conditioner has malfunctioned, effectively improving the accuracy of fault detection.

Description

Technical Field

[0001] This application relates to the field of equipment testing, and more particularly to a method for detecting faults in an air conditioner, an air conditioner, and a computer-readable storage medium. Background Technology

[0002] Currently, air conditioners that can switch between cooling and heating modes use a four-way valve to achieve this. However, four-way valves are prone to malfunction, causing the air conditioner to fail. Therefore, it is crucial to know how to detect air conditioner malfunctions. Related technologies use the temperature of the heat exchanger pipes to detect malfunctions. However, pipe temperature is affected by the air conditioner's operating parameters, making it prone to misjudgment and resulting in low accuracy in detecting malfunctions.

[0003] Therefore, improving the accuracy of detecting whether an air conditioner is malfunctioning has become an urgent problem to be solved. Summary of the Invention

[0004] This application provides a method for detecting air conditioner malfunctions, an air conditioner, and a computer-readable storage medium, which solves the problem that related technologies that use the pipe temperature of a heat exchanger to detect whether an air conditioner is malfunctioning are prone to misjudgment.

[0005] Firstly, this application provides a fault detection method for an air conditioner, the fault detection method comprising:

[0006] When the air conditioner is controlled to run in a preset mode according to a first parameter, the outlet air temperature and ambient temperature of the fan are obtained; based on the outlet air temperature and the ambient temperature, the switching state of the four-way valve is determined; if the four-way valve is in an abnormal switching state, the air conditioner is controlled to run in the preset mode according to a second parameter, wherein the operating frequency of the compressor in the second parameter is greater than the operating frequency in the first parameter; when the air conditioner is running in the preset mode according to the second parameter, if the four-way valve is in an abnormal switching state, the output power of the air conditioner is obtained; when the output power meets a preset condition, it is determined that the four-way valve has failed, wherein the preset condition is that the output power is less than the rated power range of the air conditioner in the preset mode, and the output power matches a preset fault power threshold.

[0007] The above method, when determining that the four-way valve is in an abnormal reversing state based on the outlet air temperature and ambient temperature, changes the compressor's operating frequency. If the four-way valve is still in an abnormal reversing state, the compressor's operating frequency and the air conditioner's output power are used to further determine whether the four-way valve is faulty. This avoids the problem of misjudgment that can easily occur when using the pipe temperature of the heat exchanger to detect whether the air conditioner is faulty, and can effectively improve the accuracy of fault detection.

[0008] Secondly, this application also provides an air conditioner, which includes a memory and a processor;

[0009] The memory is used to store computer programs;

[0010] The processor is used to execute the computer program and, when executing the computer program, implement the air conditioner fault detection method as described above.

[0011] Thirdly, this application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to implement the air conditioner fault detection method described above. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of an air conditioner provided in an embodiment of this application;

[0014] Figure 2 This is a schematic diagram of the structure of an air conditioner provided in an embodiment of this application;

[0015] Figure 3 This is a schematic flowchart of an air conditioner fault detection method provided in an embodiment of this application;

[0016] Figure 4 This is a schematic flowchart of another air conditioner fault detection method provided in the embodiments of this application;

[0017] Figure 5 This is a schematic flowchart illustrating a sub-step for determining the switching state of a four-way valve, as provided in an embodiment of this application.

[0018] Figure 6 This is a schematic flowchart illustrating a sub-step for controlling the operation of an air conditioner, as provided in an embodiment of this application.

[0019] Figure 7 This is a schematic flowchart illustrating a sub-step for determining whether an air conditioner has returned to a balanced pressure state, as provided in an embodiment of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0022] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0023] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0024] This application provides an air conditioner fault detection method, an air conditioner, and a computer-readable storage medium. The fault detection method can be applied to air conditioners. By determining that the four-way valve is in an abnormal reversing state based on the outlet air temperature and ambient temperature, the method further determines whether the air conditioner is malfunctioning based on the compressor's operating frequency and the air conditioner's output power. This avoids the problem of misjudgment that can easily occur when using pipe temperature to detect air conditioner malfunctions in related technologies, effectively improving the accuracy of fault detection.

[0025] For example, the air conditioner can be a household air conditioner or a portable air conditioner.

[0026] For example, an air conditioner may include a compressor, a four-way valve, a heat exchanger, and a fan corresponding to the heat exchanger. The heat exchanger may include a condenser and an evaporator, and the fan of the heat exchanger may be a condenser fan corresponding to the condenser or an evaporator fan corresponding to the evaporator.

[0027] Please see Figure 1 , Figure 1 This is a schematic diagram of an air conditioner 10 provided in an embodiment of this application. Figure 1 As shown, the air conditioner 10 may include a compressor 11, a four-way valve 12, a condenser 13, a condenser fan 14, an evaporator 15, an evaporator fan 16, an electronic expansion valve 17, a filter 18, and a process pipe 19.

[0028] like Figure 1 As shown, the four-way valve 12 may include a slider 120 and four valve ports: D, E, S, and C. It may also include a pilot valve (not shown) and a main valve (not shown). Specifically, valve port D is connected to the discharge port of compressor 11 via a copper pipe, valve port E is connected to the evaporator 15, valve port S is connected to the suction port of compressor 11 via a copper pipe, and valve port C is connected to the condenser 13. It should be noted that the minimum operating pressure difference for the four-way valve 12 to switch directions is achieved by the refrigerant flow rate. When the pressure difference between the left and right pistons exceeds the frictional resistance of slider 120, slider 120 is pushed to slide in the target direction.

[0029] For example, in cooling mode, the pilot valve is not energized, slider 120 connects valve ports E and S, and valve ports D and C. The compressor 11 discharges high-temperature, high-pressure refrigerant through valve port D and valve port C, flowing to the condenser 13 for heat exchange. A pressure drop occurs at the electronic expansion valve 17, followed by heat exchange in the evaporator 15, transforming it into a low-temperature, low-pressure refrigerant flow. This flow then passes through valve port E of the four-way valve 12 and is drawn back to the compressor 11 through valve port S, completing the system cycle. In heating mode, the pilot valve is energized, slider 120 connects valve ports C and S, and valve ports D and E. The compressor 11 discharges high-temperature, high-pressure refrigerant through valve port D and valve port E, flowing to the evaporator 15 for heat exchange. A pressure drop occurs at the electronic expansion valve 17, followed by heat exchange in the condenser 13, transforming it into a low-temperature, low-pressure refrigerant flow. This flow then passes through valve port C of the four-way valve 12 and is drawn back to the compressor 11 through valve port S, completing the system cycle.

[0030] It should be noted that the evaporator 15 is used to absorb heat, and the condenser 13 is used to release heat.

[0031] For example, such as Figure 1 As shown, the air conditioner 10 may also include multiple temperature sensors, such as a temperature sensor 160 disposed at the air outlet of the evaporator fan 16, and temperature sensors 150 and 151 disposed on the evaporator 15. Temperature sensor 160 is used to detect the outlet air temperature, temperature sensor 150 is used to detect the ambient temperature, and temperature sensor 151 is used to detect the pipe temperature of the evaporator 15. As another example, a temperature sensor 140 disposed at the air outlet of the condenser fan 14, and temperature sensors 130 and 131 disposed on the condenser 13. Temperature sensor 140 is used to detect the outlet air temperature, temperature sensor 130 is used to detect the ambient temperature, and temperature sensor 131 is used to detect the pipe temperature of the condenser 13. As yet another example, a temperature sensor 110 disposed at the exhaust port of the compressor 11 is used to detect the exhaust port temperature.

[0032] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of an air conditioner 10 provided in an embodiment of this application. The air conditioner 10 may include a processor 1001 and a memory 1002, wherein the processor 1001 and the memory 1002 can be connected by a bus, which can be any applicable bus such as an I2C (Inter-integrated Circuit) bus.

[0033] The memory 1002 may include a storage medium and internal memory. The storage medium may store an operating system and a computer program. The computer program includes program instructions that, when executed, cause the processor 1001 to perform the fault detection method described in any embodiment.

[0034] The processor 1001 provides computing and control capabilities to support the operation of the entire air conditioner 10.

[0035] The processor 1001 can be a Central Processing Unit (CPU), but it can also be a general-purpose processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor, or it can be any conventional processor.

[0036] In one embodiment, the processor 1001 is configured to run a computer program stored in the memory 1002 to perform the following steps:

[0037] When the air conditioner is running in a preset mode according to the first parameter, the outlet air temperature and ambient temperature of the fan are obtained; based on the outlet air temperature and ambient temperature, the reversing state of the four-way valve is determined; if the four-way valve is in an abnormal reversing state, the air conditioner is controlled to run in the preset mode according to the second parameter, and the compressor's operating frequency in the second parameter is greater than the operating frequency in the first parameter; when the air conditioner is running in the preset mode according to the second parameter, if the four-way valve is in an abnormal reversing state, the output power of the air conditioner is obtained; when the output power meets the preset condition, it is determined that the four-way valve has failed, the preset condition being that the output power is less than the rated power range of the air conditioner in the preset mode, and the output power matches the preset fault power threshold.

[0038] In one embodiment, the processor 1001 is also configured to implement:

[0039] If the four-way valve is in a normal reversing state when the air conditioner is running in the preset mode according to the second parameter, it is determined that the refrigerant flow for the compressor is insufficient when the air conditioner is running according to the first parameter.

[0040] In one embodiment, when the processor 1001 determines the switching state of the four-way valve based on the outlet air temperature and the ambient temperature, it is used to:

[0041] Determine the first temperature difference between the outlet air temperature and the ambient temperature; if the absolute value of the first temperature difference is less than the preset first temperature threshold, then determine that the four-way valve is in an abnormal switching state; if the absolute value of the first temperature difference is greater than or equal to the first temperature threshold, then determine that the four-way valve is in a normal switching state.

[0042] In one embodiment, the processor 1001, when controlling the air conditioner to run according to the second parameter in a preset mode, is used to:

[0043] After a preset time for controlling the fan to continue running and the compressor to stop running, the air conditioner is controlled to operate in the preset mode according to the second parameter.

[0044] In one embodiment, the processor 1001, when controlling the air conditioner to run according to the second parameter in a preset mode, is used to:

[0045] Determine if the air conditioner has returned to a balanced pressure state; if it has, control the air conditioner to operate in the preset mode according to the second parameter.

[0046] In one embodiment, when determining whether the air conditioner has returned to a balanced pressure state, the processor 1001 is configured to:

[0047] Obtain the pipe temperature of the heat exchanger; determine the second temperature difference between the pipe temperature and the ambient temperature; when the absolute value of the second temperature difference is less than the preset second temperature threshold, determine that the air conditioner has returned to the balanced pressure state.

[0048] In one embodiment, the heat exchanger includes an evaporator, and the fan corresponding to the heat exchanger is an evaporation fan. The evaporation fan's outlet is equipped with a first temperature sensor, and the evaporator is equipped with a second temperature sensor. When the processor 1001 acquires the fan's outlet temperature and the ambient temperature, it is used to:

[0049] When the preset mode is cooling mode, the temperature detected by the first temperature sensor is determined as the air outlet temperature, and the temperature detected by the second temperature sensor is determined as the ambient temperature.

[0050] In one embodiment, the heat exchanger includes a condenser, and the corresponding fan is a condenser fan. A third temperature sensor is provided at the outlet of the condenser fan, and a fourth temperature sensor is provided in the condenser. When acquiring the outlet temperature of the fan and the ambient temperature, the processor 1001 is used to:

[0051] When the preset mode is heating mode, the temperature detected by the third temperature sensor is determined as the air outlet temperature, and the temperature detected by the fourth temperature sensor is determined as the ambient temperature.

[0052] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of this application. Unless otherwise specified, the following embodiments and features described herein can be combined with each other. Please refer to... Figure 3 , Figure 3 This is a schematic flowchart illustrating a fault detection method for an air conditioner provided in an embodiment of this application. Figure 3 As shown, the air conditioner fault detection method may include steps S101 to S105.

[0053] Step S101: When the air conditioner is running in the preset mode according to the first parameter, obtain the air outlet temperature of the fan and the ambient temperature.

[0054] In some embodiments, when performing fault detection on the air conditioner, the air conditioner can be controlled to operate in a preset mode according to the first parameter, and the outlet air temperature of the fan and the ambient temperature can be obtained.

[0055] It should be noted that the preset mode can be a cooling mode, a heating mode, or other modes, such as a dehumidification mode, a fan mode, or an automatic mode. For ease of explanation, this embodiment will use the cooling mode as an example to illustrate how to detect whether the air conditioner is malfunctioning.

[0056] For example, the first parameter refers to the operating parameters of the air conditioner, which may include the operating parameters of the compressor, the operating parameters of the fan, etc. For instance, the first parameter may include the operating frequency of the compressor, etc. Among them, the operating frequency of the compressor in the first parameter can be AHz, where A can be set according to the actual situation, and the specific value is not limited here.

[0057] It should be noted that the compressor's operating frequency is used to control the refrigerant flow rate output by the compressor. As the compressor's operating frequency increases, the refrigerant flow rate output by the compressor also increases.

[0058] For example, when the preset mode is cooling mode, the fan can be the evaporator fan corresponding to the evaporator. For instance, when controlling the air conditioner to run in cooling mode at an operating frequency of A Hz, the outlet air temperature of the evaporator fan and the ambient temperature can be obtained.

[0059] like Figure 1 As shown, the outlet air temperature detected by temperature sensor 160 and the ambient temperature detected by temperature sensor 150 can be obtained.

[0060] It should be noted that since temperature sensor 160 is installed at the air outlet of evaporator fan 16, it can detect the temperature of the air after heat exchange, i.e., the outlet air temperature, which is spun out by the centrifuge. Temperature sensor 150 is installed on evaporator 15, and can detect the air temperature before heat exchange, i.e., the ambient temperature.

[0061] In the above embodiment, by controlling the air conditioner to run according to the first parameter in a preset mode, the outlet air temperature and ambient temperature of the fan are obtained, and the switching state of the four-way valve when the air conditioner is running according to the first parameter can be detected based on the outlet air temperature and ambient temperature.

[0062] It should be noted that, in the embodiments of this application, the heat exchanger may include an evaporator, the fan corresponding to the heat exchanger is an evaporator fan, the air outlet of the evaporator fan is equipped with a first temperature sensor, and the evaporator is equipped with a second temperature sensor. Figure 1 As shown, the first temperature sensor is Figure 1 The temperature sensor in the middle is 160, and the second temperature sensor is... Figure 1 The temperature sensor in the middle is 150.

[0063] In some embodiments, obtaining the outlet air temperature and ambient temperature of the fan may include: when the preset mode is cooling mode, determining the temperature detected by the first temperature sensor as the outlet air temperature, and determining the temperature detected by the second temperature sensor as the ambient temperature.

[0064] For example, such as Figure 1 It can read the temperature detected by temperature sensor 160 as the air outlet temperature, and it can read the temperature detected by temperature sensor 150 as the ambient temperature.

[0065] In the above embodiment, when the preset mode is cooling mode, the temperature detected by the first temperature sensor and the temperature detected by the second temperature sensor are obtained, and the air outlet temperature and ambient temperature in cooling mode can be obtained.

[0066] It should be noted that, in this embodiment, the heat exchanger may further include a condenser, the fan corresponding to the heat exchanger is a condenser fan, the outlet of the condenser fan is equipped with a third temperature sensor, and the condenser is equipped with a fourth temperature sensor. Figure 1 As shown, the third temperature sensor is Figure 1 Temperature sensor 140, the fourth temperature sensor is Figure 1 Temperature sensor 130 in the middle.

[0067] In some embodiments, obtaining the fan outlet temperature and ambient temperature may include: when the preset mode is heating mode, determining the temperature detected by the third temperature sensor as the outlet temperature, and determining the temperature detected by the fourth temperature sensor as the ambient temperature.

[0068] For example, such as Figure 1 It can read the temperature detected by temperature sensor 140 as the air outlet temperature, and it can read the temperature detected by temperature sensor 130 as the ambient temperature.

[0069] In the above embodiment, when the preset mode is the heating mode, the temperature detected by the third temperature sensor and the temperature detected by the fourth temperature sensor can be obtained to obtain the air outlet temperature and the ambient temperature in the heating mode.

[0070] Step S102: Determine the switching state of the four-way valve based on the outlet air temperature and the ambient temperature.

[0071] For example, after obtaining the outlet air temperature and ambient temperature of the fan, the switching state of the four-way valve can be determined based on these temperatures. For instance, the switching state of the four-way valve can be determined based on the absolute value of the temperature difference between the outlet air temperature and the ambient temperature.

[0072] For example, the switching state of the four-way valve can include an abnormal switching state and a normal switching state. In cooling mode, if the four-way valve is in the normal switching state, the air conditioner can cool normally; if the four-way valve is in the abnormal state, the air conditioner cannot cool or the cooling effect is poor.

[0073] It's important to note that the cooling effect can be reflected in the temperature difference between the outlet air temperature and the ambient temperature. In cooling mode, if the outlet air temperature is lower than the ambient temperature, it means the cooling function is working; a larger temperature difference indicates a better cooling effect, and a smaller temperature difference indicates a worse cooling effect. Therefore, the absolute value of the temperature difference between the outlet air temperature and the ambient temperature can be used to determine whether the four-way valve's switching state is normal.

[0074] In the above embodiment, the switching state of the four-way valve can be conveniently determined based on the absolute value of the temperature difference between the outlet air temperature and the ambient temperature.

[0075] Step S103: If the four-way valve is in an abnormal reversing state, control the air conditioner to operate in the preset mode according to the second parameter, and the compressor's operating frequency in the second parameter is greater than its operating frequency in the first parameter.

[0076] For example, after determining the switching state of the four-way valve based on the outlet air temperature and the ambient temperature, if the four-way valve is in an abnormal switching state, the air conditioner is controlled to operate in a preset mode according to the second parameter. The compressor's operating frequency in the second parameter is greater than its operating frequency in the first parameter.

[0077] For example, the operating frequency of the compressor in the second parameter can be B Hz, where B can be set according to actual conditions, and the specific value is not limited here. The operating frequency B Hz is greater than the operating frequency A Hz of the compressor in the first parameter.

[0078] In the above embodiments, by increasing the operating frequency of the compressor in the second parameter and controlling the air conditioner to operate according to the second parameter in a preset mode, it is possible to detect whether the abnormal reversing state of the four-way valve is caused by insufficient refrigerant flow of the compressor.

[0079] It should be noted that since the minimum operating pressure difference for the four-way valve to switch is achieved by the refrigerant flow, when the refrigerant flow of the compressor is insufficient, the pressure difference of the piston in the four-way valve is less than the frictional resistance of the slider, and it cannot push the slider to slide, which will cause the four-way valve to switch abnormally.

[0080] Step S104: When the air conditioner is running in the preset mode according to the second parameter, if the four-way valve is in an abnormal reversing state, the output power of the air conditioner is obtained.

[0081] For example, when the air conditioner is controlled to run in a preset mode according to the second parameter, the outlet air temperature of the fan and the ambient temperature are obtained, and the switching state of the four-way valve is determined based on the outlet air temperature and the ambient temperature; if the four-way valve is in an abnormal switching state, the output power of the air conditioner is obtained.

[0082] Output power refers to the total power of the air conditioner, which can include the sum of the power of all components in the air conditioner.

[0083] It should be noted that if the four-way valve is in an abnormal reversing state due to insufficient refrigerant flow from the compressor, then increasing the compressor's operating frequency in the second parameter should restore the four-way valve to its normal reversing state. If the four-way valve remains in an abnormal reversing state, it indicates that the abnormal reversing is not due to insufficient refrigerant flow from the compressor.

[0084] In the above embodiment, if the four-way valve is still in an abnormal reversing state when the air conditioner is running in a preset mode according to the second parameter, it can be determined that the abnormal reversing of the four-way valve is not caused by insufficient refrigerant flow of the compressor; by obtaining the output power of the air conditioner, it is possible to further determine whether the four-way valve is malfunctioning based on the output power.

[0085] Step S105: When the output power meets the preset conditions, it is determined that the four-way valve has failed. The preset conditions are that the output power is less than the rated power range of the air conditioner in the preset mode, and the output power matches the preset fault power threshold.

[0086] For example, after obtaining the air conditioner's output power, if the output power meets a preset condition, it can be determined that the four-way valve has malfunctioned. The preset condition is that the output power is less than the air conditioner's rated power range in a preset mode, and the output power matches a preset fault power threshold.

[0087] For example, if the air conditioner's output power is less than its rated power range in cooling mode but matches the preset fault power threshold, then the four-way valve is faulty. The rated power range can be set according to the air conditioner's operating parameters; the specific value is not limited here. The preset fault power threshold can be set according to actual conditions; the specific value is not limited here.

[0088] It should be noted that the power output within the rated power range exceeds the fault power threshold. Understandably, during normal operation, the better the heat exchange, the lower the corresponding output power. Since the compressor operates under load, the air conditioner's output power will exceed the fault power threshold. Furthermore, because the pressure ratio between evaporating and condensing pressures determines the air conditioner's output power, when the four-way valve malfunctions, the system cannot establish a pressure differential, resulting in the air conditioner's output power being significantly lower than the rated power range.

[0089] By analyzing the relationship between output power and rated power range, and fault power threshold, it is possible to accurately determine whether a four-way valve is malfunctioning.

[0090] In the above embodiment, when it is determined that the four-way valve is in an abnormal reversing state based on the outlet air temperature and the ambient temperature, the operating frequency of the compressor is changed. If the four-way valve is still in an abnormal reversing state, the operating frequency of the compressor and the output power of the air conditioner are used to further determine whether the four-way valve is faulty. This avoids the problem of misjudgment that may occur when using the pipe temperature of the heat exchanger to detect whether the air conditioner is faulty, and can effectively improve the accuracy of fault detection.

[0091] Please see Figure 4 , Figure 4 This is a schematic flowchart of another air conditioner fault detection method provided in the embodiments of this application, such as... Figure 4 As shown, the steps S201 to S204 may be included.

[0092] Step S201: When the air conditioner is running in the preset mode according to the first parameter, obtain the air outlet temperature of the fan and the ambient temperature.

[0093] Step S202: Determine the switching state of the four-way valve based on the outlet air temperature and the ambient temperature.

[0094] Step S203: If the four-way valve is in an abnormal reversing state, control the air conditioner to operate in the preset mode according to the second parameter, and the compressor's operating frequency in the second parameter is greater than its operating frequency in the first parameter.

[0095] It is understood that steps S201 to S203 are the same as steps S101 to S103 above, and will not be repeated here.

[0096] Step S204: When the air conditioner is running in the preset mode according to the second parameter, if the four-way valve is in the normal reversing state, it is determined that when the air conditioner is running according to the first parameter, the refrigerant flow for compressor startup is insufficient.

[0097] For example, when the air conditioner is controlled to run in a preset mode according to the second parameter, the outlet air temperature of the fan and the ambient temperature are obtained, and the reversing state of the four-way valve is determined based on the outlet air temperature and the ambient temperature; if the four-way valve is in the normal reversing state, it is determined that the refrigerant flow for the compressor to start is insufficient when the air conditioner is running according to the first parameter.

[0098] It should be noted that if the four-way valve resumes normal reversing after increasing the compressor's operating frequency in the second parameter and controlling the air conditioner to operate according to the second parameter in the preset mode, it indicates that the abnormal reversing of the four-way valve is caused by insufficient refrigerant flow when the compressor starts.

[0099] In the above embodiment, by controlling the air conditioner to operate according to the second parameter in the preset mode, the four-way valve resumes normal reversing, which confirms that the abnormal reversing of the four-way valve is caused by insufficient refrigerant flow in the compressor.

[0100] Please see Figure 5 , Figure 5 This is a schematic flowchart illustrating a sub-step for determining the switching state of a four-way valve, as provided in an embodiment of this application. Figure 5 As shown, the steps S301 to S303 may be included.

[0101] Step S301: Determine the first temperature difference between the outlet air temperature and the ambient temperature.

[0102] For example, the first temperature difference between the wind temperature and the ambient temperature can be calculated.

[0103] Step S302: If the absolute value of the first temperature difference is less than the preset first temperature threshold, then the four-way valve is determined to be in an abnormal reversing state.

[0104] For example, when the absolute value of the first temperature difference between the outlet air temperature and the ambient temperature is less than a preset first temperature threshold, it can be determined that the four-way valve is in an abnormal switching state. The preset first temperature threshold can be set according to actual conditions, and its specific value is not limited here.

[0105] It should be noted that in cooling mode, the larger the absolute value of the first temperature difference between the outlet air temperature and the ambient temperature, the better the cooling effect; conversely, the smaller the absolute value of the first temperature difference between the outlet air temperature and the ambient temperature, the worse the cooling effect. When the four-way valve reverses abnormally, the evaporator cannot exchange heat, and the outlet air temperature is not significantly different from the ambient temperature. Therefore, the reversing status of the four-way valve can be determined by the absolute value of the first temperature difference between the outlet air temperature and the ambient temperature.

[0106] Step S303: If the absolute value of the first temperature difference is greater than or equal to the first temperature threshold, then the four-way valve is determined to be in normal switching state.

[0107] For example, when the absolute value of the first temperature difference is greater than or equal to the first temperature threshold, it can be determined that the four-way valve is in a normal switching state.

[0108] The above embodiment determines the switching state of the four-way valve based on the absolute value of the first temperature difference between the outlet air temperature and the ambient temperature. This avoids the problem of misjudgment that can easily occur when using the pipe temperature of the heat exchanger to detect whether the four-way valve is faulty, and can effectively improve the accuracy of fault detection.

[0109] In some embodiments, controlling the air conditioner to operate in a preset mode according to the second parameter may further include: controlling the air conditioner to operate in a preset mode according to the second parameter after a preset time period during which the fan continues to run and the compressor stops running.

[0110] For example, such as Figure 1 As shown, in cooling mode, when it is determined that the four-way valve 12 is in an abnormal reversing state, the evaporator fan 16 can be controlled to continue running and the compressor 11 can be stopped for a preset time; then, the air conditioner is controlled to operate in cooling mode according to the second parameter. The preset time can be set according to the actual situation, and the specific value is not limited here.

[0111] It should be noted that by controlling the evaporator fan to continue operating, heat exchange can be maintained, thereby ensuring that the refrigerant flow rate in the system is consistent with the ambient temperature. This guarantees the accuracy of determining the switching state of the four-way valve based on the outlet air temperature and ambient temperature. By controlling the compressor to stop operating for a preset duration, the air conditioner can quickly return to a balanced pressure state, ensuring that the pressure state when the air conditioner operates according to the second parameter is consistent with the pressure state when controlled to operate according to the first parameter.

[0112] In the above embodiment, by controlling the air conditioner to operate according to the second parameter in a preset mode after the fan continues to run and the compressor stops running for a preset time, the refrigerant flow rate in the system can be made consistent with the ambient temperature when the air conditioner is running according to the second parameter. At the same time, it can also ensure that the pressure state of the air conditioner when running according to the second parameter is consistent with the pressure state when the air conditioner is running according to the first parameter.

[0113] Please see Figure 6 , Figure 6 This is a schematic flowchart illustrating the sub-steps of controlling air conditioner operation according to an embodiment of this application, such as... Figure 6 As shown, it may include the following steps S401 and S402.

[0114] Step S401: Determine whether the air conditioner has returned to a balanced pressure state.

[0115] For example, before controlling the air conditioner to operate according to the second parameter in the preset mode, it can be determined whether the air conditioner has returned to the balanced pressure state; if the air conditioner has not returned to the balanced pressure state, then continue to wait until the air conditioner returns to the balanced pressure state.

[0116] For example, the compressor can be stopped for a preset duration to allow the air conditioner to return to a balanced pressure state.

[0117] Step S402: If the air conditioner returns to the balanced pressure state, control the air conditioner to operate according to the second parameter in the preset mode.

[0118] For example, when the air conditioner returns to a balanced pressure state, it can be controlled to operate in a preset mode according to the second parameter.

[0119] In the above embodiments, by controlling the air conditioner to operate according to the second parameter in the preset mode after the air conditioner returns to the balanced pressure state, it can be ensured that the pressure state of the air conditioner when operating according to the second parameter is consistent with the pressure state when operating according to the first parameter. This avoids interference from the air conditioner's pressure state in determining the switching state of the four-way valve, and can improve the accuracy of determining the switching state of the four-way valve.

[0120] Please see Figure 7 , Figure 7 This is a schematic flowchart illustrating a sub-step in determining whether an air conditioner has returned to a balanced pressure state, as provided in an embodiment of this application. Figure 7 As shown, determining whether the air conditioner has returned to a balanced pressure state in step S401 may include the following steps S501 to S503.

[0121] Step S501: Obtain the pipe temperature of the heat exchanger.

[0122] For example, such as Figure 1As shown, in cooling mode, the pipe temperature of the evaporator 15 detected by the temperature sensor 151 can be obtained.

[0123] Understandably, in heating mode, the pipe temperature of the condenser 13 detected by temperature sensor 131 can be obtained.

[0124] Step S502: Determine the second temperature difference between the pipe temperature and the ambient temperature.

[0125] For example, after obtaining the pipe temperature of the heat exchanger, a second temperature difference between the pipe temperature and the ambient temperature can be calculated.

[0126] Step S503: When the absolute value of the second temperature difference is less than the preset second temperature threshold, determine that the air conditioner has returned to the balanced pressure state.

[0127] For example, after calculating the second temperature difference between the pipe temperature and the ambient temperature, the absolute value of the second temperature difference can be compared with a preset second temperature threshold. If the absolute value of the second temperature difference is less than the second temperature threshold, it can be determined that the air conditioner has returned to the equilibrium pressure state. If the absolute value of the second temperature difference is greater than or equal to the second temperature threshold, it can be determined that the air conditioner has not returned to the equilibrium pressure state. The second temperature threshold can be set according to actual conditions, and its specific value is not limited here.

[0128] It should be noted that when the pipe temperature is close to the ambient temperature, it can be determined that the air conditioner has returned to a balanced pressure state.

[0129] In some embodiments, when the compressor stops running for a preset period of time, it can be determined that the air conditioner has returned to a balanced pressure state.

[0130] In the above embodiments, by determining the second temperature difference between the pipe temperature and the ambient temperature, it is possible to determine that the air conditioner has returned to the balanced pressure state when the absolute value of the second temperature difference is less than a preset second temperature threshold.

[0131] The embodiments of this application also provide a computer-readable storage medium storing a computer program, which includes program instructions. A processor executes the program instructions to implement any of the air conditioner fault detection methods provided in the embodiments of this application.

[0132] For example, when the program is loaded by the processor, it can perform the following steps:

[0133] When the air conditioner is running in a preset mode according to the first parameter, the outlet air temperature and ambient temperature of the fan are obtained; based on the outlet air temperature and ambient temperature, the reversing state of the four-way valve is determined; if the four-way valve is in an abnormal reversing state, the air conditioner is controlled to run in the preset mode according to the second parameter, and the compressor's operating frequency in the second parameter is greater than the operating frequency in the first parameter; when the air conditioner is running in the preset mode according to the second parameter, if the four-way valve is in an abnormal reversing state, the output power of the air conditioner is obtained; when the output power meets the preset condition, it is determined that the four-way valve has failed, the preset condition being that the output power is less than the rated power range of the air conditioner in the preset mode, and the output power matches the preset fault power threshold.

[0134] The computer-readable storage medium can be the internal storage unit of the air conditioner in the aforementioned embodiments, such as the air conditioner's hard drive or memory. Alternatively, the computer-readable storage medium can be an external storage device of the air conditioner, such as a plug-in hard drive, smart media card (SMC), secure digital card (SDCard), flash card, etc.

[0135] Furthermore, a computer-readable storage medium may primarily include a program storage area and a data storage area, wherein the program storage area may store the operating system, programs required for at least one function, etc.; and the data storage area may store data created according to each program, etc.

[0136] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for detecting faults in an air conditioner, characterized in that, The air conditioner includes a compressor, a four-way valve, a heat exchanger, and a fan corresponding to the heat exchanger. The fault detection method includes: When the air conditioner is controlled to run in a preset mode according to the first parameter, the outlet air temperature of the fan and the ambient temperature are obtained. The switching state of the four-way valve is determined based on the outlet air temperature and the ambient temperature. If the four-way valve is in an abnormal reversing state, the air conditioner is controlled to operate according to the second parameter in the preset mode, and the operating frequency of the compressor in the second parameter is greater than the operating frequency in the first parameter; When the air conditioner is running in the preset mode according to the second parameter, if the four-way valve is in an abnormal reversing state, the output power of the air conditioner is obtained; When the output power meets a preset condition, it is determined that the four-way valve has malfunctioned. The preset condition is that the output power is less than the rated power range of the air conditioner in the preset mode, and the output power matches the preset fault power threshold.

2. The air conditioner fault detection method according to claim 1, characterized in that, The fault detection method further includes: If the four-way valve is in a normal reversing state when the air conditioner is running in the preset mode according to the second parameter, it is determined that the refrigerant flow of the compressor is insufficient when the air conditioner is running according to the first parameter.

3. The air conditioner fault detection method according to claim 1, characterized in that, Determining the switching state of the four-way valve based on the outlet air temperature and the ambient temperature includes: Determine a first temperature difference between the outlet air temperature and the ambient temperature; If the absolute value of the first temperature difference is less than the preset first temperature threshold, then the four-way valve is determined to be in an abnormal switching state. If the absolute value of the first temperature difference is greater than or equal to the first temperature threshold, then the four-way valve is determined to be in a normal switching state.

4. The air conditioner fault detection method according to claim 1, characterized in that, The method of controlling the air conditioner to operate according to the second parameter in the preset mode further includes: After a preset time for controlling the fan to continue running and the compressor to stop running, the air conditioner is controlled to operate according to the second parameter in the preset mode.

5. The air conditioner fault detection method according to any one of claims 1-4, characterized in that, The method of controlling the air conditioner to operate according to the second parameter in the preset mode further includes: Determine whether the air conditioner has returned to a balanced pressure state; If the air conditioner returns to a balanced pressure state, then the air conditioner is controlled to operate according to the second parameter in the preset mode.

6. The air conditioner fault detection method according to claim 5, characterized in that, Determining whether the air conditioner has returned to a balanced pressure state includes: Obtain the pipe temperature of the heat exchanger; Determine a second temperature difference between the pipe temperature and the ambient temperature; When the absolute value of the second temperature difference is less than the preset second temperature threshold, the air conditioner is determined to have returned to the balanced pressure state.

7. The air conditioner fault detection method according to claim 1, characterized in that, The heat exchanger includes an evaporator, and the fan corresponding to the heat exchanger is an evaporation fan. A first temperature sensor is installed at the outlet of the evaporation fan, and a second temperature sensor is installed in the evaporator. The process of obtaining the outlet temperature of the fan and the ambient temperature includes: When the preset mode is cooling mode, the temperature detected by the first temperature sensor is determined as the air outlet temperature, and the temperature detected by the second temperature sensor is determined as the ambient temperature.

8. The air conditioner fault detection method according to claim 1, characterized in that, The heat exchanger includes a condenser, and the corresponding fan is a condenser fan. A third temperature sensor is installed at the outlet of the condenser fan, and a fourth temperature sensor is installed in the condenser. The process of obtaining the outlet temperature of the fan and the ambient temperature includes: When the preset mode is the heating mode, the temperature detected by the third temperature sensor is determined as the air outlet temperature, and the temperature detected by the fourth temperature sensor is determined as the ambient temperature.

9. An air conditioner, characterized in that, The air conditioner includes a memory and a processor; The memory is used to store computer programs; The processor is configured to implement the air conditioner fault detection method as described in any one of claims 1 to 8 when executing the computer program.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the air conditioner fault detection method as described in any one of claims 1 to 8.

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