Outer ring temperature sensor fault detection method, air conditioner and readable storage medium

Abstract

The invention provides an outer ring temperature sensor fault detection method, an air conditioner and a readable storage medium. The outer ring temperature sensor fault detection method comprises the steps that the outer ring temperature is obtained through an outer ring temperature sensor, and the outdoor heat exchanger temperature and the compressor temperature are obtained through an outdoor heat exchanger temperature sensor; if the first preset condition is met, the air conditioner is controlled to operate in a heating mode for a first preset duration according to the outer ring temperature; and after a control strategy is determined according to the relation between the cooling rate and a preset rate and the air conditioner is controlled to operate, whether an outer ring temperature sensor breaks down or not is judged according to the temperature of the outdoor heat exchanger. The first preset condition is that the current heating operation, the outer ring temperature, the outdoor heat exchanger temperature and the compressor temperature are all smaller than a first preset temperature value, and the difference value between the outer ring temperature and the minimum value in other temperatures is larger than or equal to a second preset temperature value. According to the invention, the accuracy of judging the fault of the outer ring temperature sensor is improved aiming at low-temperature influence.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning control, and in particular to a method for detecting faults of an outer ring temperature sensor, an air conditioner and a readable storage medium. Background Art

[0002] In the existing air-conditioning control method, the operation of the air-conditioning is mainly controlled based on the indoor ambient temperature and the outdoor ambient temperature. The outdoor ambient temperature is one of the important parameters for regulating the operation of the air-conditioning. Its function is to control the operation mode of the air-conditioning, limit the operating range of the compressor frequency and the operating speed of the outdoor fan.

[0003] Among them, the device for detecting the outdoor ambient temperature is the outdoor ambient temperature sensor (hereinafter referred to as the outer ring temperature sensor). When the outer ring temperature sensor fails, the outdoor ambient temperature cannot be collected, and the air conditioner can no longer be controlled according to the existing control method. The common control strategy is to display the temperature sensor failure on the indoor unit display. Once the above failure occurs, the air conditioner will shut down directly and the user cannot continue to use it until the failure is eliminated, affecting the user's experience.

[0004] The temperature sensor is essentially a thermistor. To prevent the air conditioner from continuing to operate despite the actual temperature sensor being damaged, a temperature detection range is typically set. If the detected temperature exceeds the temperature range set by the air conditioner control logic, the temperature sensor is considered faulty. For example, if the outdoor unit's ambient temperature is -40°C and the detected outdoor temperature is also -40°C, but the detection range of the outer temperature sensor is set to [-35°C, 100°C], the detected temperature will exceed the temperature range set by the air conditioner control logic, and the temperature sensor will be considered faulty.

[0005] Therefore, when the outdoor unit is operating under extreme conditions, such as in an ultra-low temperature environment, the temperature measured by the outer temperature sensor is very low, which may be mistakenly interpreted as a temperature sensor failure in the control logic. However, the actual measured temperature is the actual ambient temperature of the air conditioner, and the outer temperature sensor is not damaged. On the other hand, in actual use, if the outer temperature sensor is not properly inserted or abnormally falls off, the measured temperature may not be the actual outdoor ambient temperature.

[0006] A conventional method for diagnosing an abnormal exhaust temperature sensor position fault determines whether the exhaust temperature sensor is dislodged based on changes in the exhaust temperature sensor's detected temperature and the heat exchanger temperature. If the exhaust temperature sensor is not dislodged, the method further determines whether the exhaust temperature sensor is properly seated based on changes in the exhaust temperature sensor's detected temperature, the heat exchanger temperature, and the ambient temperature.

[0007] Existing control methods combine data from other temperature sensors to determine whether a temperature sensor is missing or properly installed. However, this method fails to consider that at low temperatures, the change in heat exchanger tube temperature is very small, which can lead to significant errors in the proportionality coefficient calculation, resulting in erroneous judgments. Summary of the Invention

[0008] A first object of the present invention is to provide a method for detecting an outer ring temperature sensor fault, which can accurately determine an outer ring temperature sensor fault under low temperature conditions.

[0009] A second object of the present invention is to provide an air conditioner capable of implementing the above-mentioned outer ring temperature sensor failure detection method.

[0010] A third object of the present invention is to provide a readable storage medium capable of implementing the above-mentioned outer ring temperature sensor fault detection method.

[0011] The first purpose of the present invention provides an outer ring temperature sensor fault detection method including obtaining the outer ring temperature through the outer ring temperature sensor, obtaining the outdoor heat exchanger temperature through the outdoor heat exchanger temperature sensor, and obtaining the compressor temperature; if the first preset condition is met: controlling the air conditioner to operate in heating mode for a first preset period of time according to the outer ring temperature; calculating the cooling rate of the outdoor heat exchanger temperature, and determining the control strategy according to the relationship between the cooling rate and the preset rate, the control strategy including adjusting the compressor frequency; after controlling the air conditioner to operate according to the determined control strategy, determining whether the outer ring temperature sensor is faulty according to the outdoor heat exchanger temperature; the first preset condition is that the current operating mode is the heating mode, the outer ring temperature, the outdoor heat exchanger temperature and the compressor temperature are all less than the first preset temperature value, and the difference between the minimum value of the outdoor heat exchanger temperature and the compressor temperature and the outer ring temperature is greater than or equal to the second preset temperature value.

[0012] As can be seen from the above scheme, when multiple temperatures are detected to be below preset values, and the temperature displayed by the outer loop temperature is lower than the other temperatures, the system does not immediately convert the temperature to the other temperatures. Instead, it first operates the heating system for a certain period of time based on the detected outer loop temperature. The cooling rate of the outdoor heat exchanger temperature is then measured. A higher cooling rate indicates better operation. Based on this cooling rate, the air conditioner system's operating status is determined and the most appropriate control strategy is determined. A higher cooling rate controls the compressor to operate at a lower frequency, while a lower cooling rate controls the compressor to operate at a higher frequency. After a certain period of operation according to the determined control strategy, the system monitors the outdoor heat exchanger temperature for changes. The control strategies are all designed to attempt to improve the heat exchange efficiency of the heat exchanger. If the heat exchange efficiency (significant cooling) is significantly improved, it can be determined that the actual outdoor ambient temperature is not too low (if the actual outer loop temperature is too low, the heat exchanger temperature should remain unchanged or slightly decrease). Therefore, the outer loop temperature signaled by the outer loop temperature sensor is incorrect, and a fault can be detected.

[0013] A further solution is that in the step of determining the control strategy based on the relationship between the cooling rate and the preset rate: when the cooling rate is greater than or equal to the first preset rate, the control strategy is determined to be the first control strategy: control the compressor to reduce the frequency and run for the second preset time; when the cooling rate is less than the first preset rate and greater than or equal to the second preset rate, the control strategy is determined to be the second control strategy: increase the compressor frequency with the first variable and run for the third preset time; when the cooling rate is less than the second preset rate, the control strategy is determined to be the third control strategy: increase the compressor frequency with the second variable and run for the fourth preset time, and the second variable is greater than the first variable.

[0014] A further solution is to control the operation of the air conditioner according to a determined control strategy, and then determine whether the outer loop temperature sensor is faulty based on the temperature of the outdoor heat exchanger after the operation: after controlling the operation of the air conditioner according to the first control strategy, if the temperature of the outdoor heat exchanger after the operation is lower than the temperature of the outdoor heat exchanger before the operation, it is determined that the outer loop temperature sensor is faulty.

[0015] Another further solution is that after controlling the operation of the air conditioner according to the determined control strategy, the step of judging whether the outer loop temperature sensor is faulty is based on the temperature of the outdoor heat exchanger after the operation: after controlling the operation of the air conditioner according to the second control strategy, the cooling rate of the outdoor heat exchanger temperature is calculated; if the cooling rate is greater than the first preset rate, it is determined that the outer loop temperature sensor is faulty.

[0016] As can be seen from the above, when the cooling rate is greater than or equal to the first preset rate, it means that the heat exchange effect of the heat exchanger is significant during operation. At this time, the operating frequency of the compressor is reduced. After the demand for the air conditioner is reduced, if the environment is low temperature, the outdoor heat exchanger temperature should remain unchanged. This can be used to verify the actual outdoor temperature and determine whether the outer ring temperature sensor is faulty. When the cooling rate is less than the first preset rate and greater than or equal to the second preset rate, the heat exchange effect of the heat exchanger is significant during operation. At this time, the compressor frequency is increased to improve the heat exchange effect of the heat exchanger. If the outdoor heat exchanger temperature drops significantly, it means that the actual outer ring temperature is not too low. This can be used to verify the actual outdoor temperature and determine whether the outer ring temperature sensor is faulty. When the cooling rate is less than the second preset rate, the heat exchange effect of the heat exchanger is not significant during operation. At this time, the compressor frequency is increased to a greater extent to improve the heat exchange effect of the heat exchanger. If the outdoor heat exchanger temperature drops significantly, it means that the actual outer ring temperature is not too low. This can be used to verify the actual outdoor temperature and determine whether the outer ring temperature sensor is faulty.

[0017] Another further solution is that after controlling the operation of the air conditioner according to the determined control strategy, in the step of judging whether the outer ring temperature sensor is faulty according to the temperature of the outdoor heat exchanger after the operation: after controlling the operation of the air conditioner according to the third control strategy, the cooling rate of the outdoor heat exchanger temperature and the change difference of the inner ring temperature are calculated; if the cooling rate is greater than the first preset rate and the change difference is greater than the third preset temperature value, it is determined that the outer ring temperature sensor is faulty.

[0018] It can be seen from the above that when the cooling rate is less than the second preset rate, the heat exchange effect of the heat exchanger is not obvious during operation. At this time, the compressor frequency is increased to a greater extent to improve the heat exchange effect of the heat exchanger. If the outdoor heat exchanger temperature drops significantly, it means that the actual outer ring temperature is not too low. Furthermore, the inner ring temperature change is combined to continue to judge. In the case of ultra-low temperature, the air conditioner no longer has a strong heating effect, and the temperature of the indoor environment will not have a large temperature change. This can more accurately determine whether the outer ring temperature sensor is faulty.

[0019] Another further solution is that the second control strategy and the third control strategy also include increasing the speed of the outdoor fan.

[0020] As can be seen from the above, increasing the speed of the outdoor fan will speed up the air flow in the environment where the outdoor unit is located, increase the heat exchange between the outdoor heat exchanger and the external environment, and extract heat more effectively, which will help obtain more accurate judgment results.

[0021] Another further solution is that after the steps of obtaining the outer ring temperature through the outer ring temperature sensor, obtaining the outdoor heat exchanger temperature through the outdoor heat exchanger temperature sensor, and obtaining the compressor temperature: if the second preset condition is met, it is determined that the outer ring temperature sensor is faulty; the second preset condition is that the current operating mode is the cooling mode, and the outer ring temperature, the outdoor heat exchanger temperature, and the compressor temperature are all lower than the first preset temperature value.

[0022] As can be seen above, in the above steps, the first preset condition is determined based on the heating operation requirement. If the current operating mode is cooling mode, and the outer ring temperature, outdoor heat exchanger temperature, and compressor temperature are all less than the first preset temperature value, the outdoor environment is actually at a high temperature, and the outer ring temperature sensor can be determined to be faulty.

[0023] Another further solution is that after the steps of obtaining the outer ring temperature through the outer ring temperature sensor, obtaining the outdoor heat exchanger temperature through the outdoor heat exchanger temperature sensor, and obtaining the compressor temperature: if the third preset condition is met: control the air conditioner to operate with the compressor self-preheating function, and judge whether the outer ring temperature sensor is faulty according to the change of the compressor temperature; the third preset condition is: the current operating mode is the heating mode, the outer ring temperature, the outdoor heat exchanger temperature and the compressor temperature are all less than the first preset temperature value, and the difference between the minimum value of the outdoor heat exchanger temperature and the compressor temperature and the outer ring temperature is less than the second preset temperature value.

[0024] As can be seen above, if multiple temperatures are showing low temperatures and the difference between the outer ring temperature and other temperatures is small, the compressor is operating with the self-preheating function. If the compressor exhaust temperature and the temperature of the compressor base rise rapidly, the exhaust temperature sensor is considered normal and the temperature values ​​collected for the first time are actual temperature values. At this time, it is confirmed that the outer ring temperature sensor is normal and there is no fault.

[0025] The second object of the present invention provides an air conditioner including a processor, which is configured to implement the above-mentioned outer ring temperature sensor fault detection method when executing a computer program stored in a memory.

[0026] The third object of the present invention provides a readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the above-mentioned outer ring temperature sensor fault detection method is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of system connection of an air conditioner embodiment of the present invention.

[0028] Figure 2 This is a flowchart of an embodiment of a method for detecting a fault of an outer ring temperature sensor according to the present invention. DETAILED DESCRIPTION

[0029] Air Conditioner and External Ring Temperature Sensor Fault Detection Method Embodiment See also Figure 1 The refrigeration system of the air conditioner in this embodiment includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, and an indoor heat exchanger 4. In addition, it also includes an exhaust temperature sensor 5 arranged on the exhaust side of the compressor 1, and a bottom temperature sensor 6 arranged at the bottom of the compressor 1. The compressor temperature sensor of the present invention includes the exhaust temperature sensor 5 and the bottom temperature sensor 6; in addition, it also includes an outdoor heat exchanger temperature sensor 7 arranged on the pipe of the outdoor heat exchanger 3 and an indoor heat exchanger temperature sensor 8 arranged on the pipe of the indoor heat exchanger 4. Of course, what is not shown is that it also includes an outer ring temperature sensor arranged on the outdoor unit for detecting the outdoor ambient temperature, and an inner ring temperature sensor arranged on the indoor unit for detecting the indoor ambient temperature. Among them, the above-mentioned temperature sensors are all temperature sensing bags.

[0030] Of course, the air conditioner of the present invention includes a processor and a memory, such as a single chip microcomputer including a central processing unit, etc. Moreover, the processor is used to implement all steps of the outer ring temperature sensor fault detection method of the present invention when executing the computer program stored in the memory.

[0031] 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), 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.

[0032] The memory primarily includes a program storage area and a data storage area. The program storage area can store an operating system and at least one application required for a function (such as sound playback or image playback); the data storage area can store data generated based on the use of the handheld terminal (such as audio data and a phone book). Furthermore, the memory can include high-speed random access memory (RAM) and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0033] Combine Figure 1 and Figure 2 The outer ring temperature sensor fault detection method of the present invention includes: Execute step S1 to obtain the outer ring temperature through the outer ring temperature sensor, the outdoor heat exchanger temperature through the outdoor heat exchanger temperature sensor 7, and the compressor temperature. The compressor temperature includes the exhaust temperature obtained by the exhaust temperature sensor 5 and the bottom temperature obtained by the bottom temperature sensor 6.

[0034] Then, the judgment step S2 is executed to judge whether the four temperatures of the outer ring temperature, the outdoor heat exchanger temperature, the exhaust temperature and the bottom temperature are all less than the first preset temperature value M. If the judgment result is no, a loop judgment is performed.

[0035] If the judgment result is yes, step S3 is executed to determine whether the first preset condition is met. The first preset condition is that the current operating mode is heating mode and the difference between the minimum value of the outdoor heat exchanger temperature and the compressor temperature and the outer ring temperature is greater than or equal to a second preset temperature value U.

[0036] Of course, it can also be considered that the first preset condition and the second preset condition and the third preset condition below also include the prerequisite for entering step S3: the four temperatures of outer ring temperature, outdoor heat exchanger temperature, exhaust temperature and bottom temperature are all less than the first preset temperature value M.

[0037] If the first preset condition is met, step S4 is executed. At this time, the external heat exchanger temperature T0 and the indoor ambient temperature R0 are recorded. The compressor frequency, external fan speed, and other load controls are controlled based on the external heat exchanger temperature sent by the external heat exchanger for a first preset duration N1.

[0038] After the first preset time N1 is run, step S5 is executed to obtain the current outdoor heat exchanger temperature T 1, , and calculate the cooling rate of the outdoor heat exchanger temperature K=| T1- T0| / N1.

[0039] Then, step S6 is executed to determine a control strategy based on the relationship between the cooling rate K and the preset rate Q. The control strategy includes adjusting the compressor frequency.

[0040] In step S6, further: (1) When the cooling rate K is greater than or equal to the first preset rate Q1, the control strategy is determined to be the first control strategy: controlling the compressor to reduce the frequency and run for the second preset time N2.

[0041] In this embodiment, the compressor is controlled to reduce the frequency by 10 Hz, and in this embodiment, the second preset time length N2 is equal to the first preset time length N1.

[0042] (2) When the cooling rate K is less than the first preset rate Q1 and greater than or equal to the second preset rate Q2, the control strategy is determined to be the second control strategy: increase the compressor frequency with the first variable, increase the speed of the outdoor fan and run for the third preset time N3.

[0043] Among them, the specific means of increasing the compressor frequency include increasing the frequency limiting temperature and frequency reduction temperature of heating overload, and the frequency limiting temperature and frequency reduction temperature do not exceed their respective corresponding preset shutdown temperatures; among them, the third preset time length N3 is equal to the first preset time length N1.

[0044] (3) When the cooling rate K is less than the second preset rate Q2, the control strategy is determined to be the third control strategy: the compressor frequency is increased by the second variable, the speed of the outdoor fan is increased, and the operation is performed for the fourth preset time N4, and the second variable is greater than the first variable.

[0045] The specific means of increasing the compressor frequency includes increasing the frequency limit temperature, frequency reduction temperature, and shutdown temperature for heating overload within the reliability range of the compressor operation. The fourth preset time length N4 is equal to the first preset time length N1.

[0046] Then, step S7 is executed to control the operation of the air conditioner according to the determined control strategy, and then step S8 is executed to determine whether the outer ring temperature sensor is faulty according to the temperature of the outdoor heat exchanger.

[0047] When the first control strategy is determined in step S6 and step S8 is executed: The outdoor heat exchanger temperature T2 after running for the second preset time N2 is obtained. If the outdoor heat exchanger temperature T2 is lower than the outdoor heat exchanger temperature T0 before the operation, it is determined that the outer ring temperature sensor is faulty.

[0048] When the cooling rate is greater than or equal to the first preset rate, it means that the heat exchange effect of the heat exchanger is obvious during operation. At this time, the operating frequency of the compressor is reduced. After the demand for air conditioning is reduced, if it is in a low temperature environment, the outdoor heat exchanger temperature should remain unchanged. This can be used to verify the actual outdoor temperature and determine whether the outer ring temperature sensor is faulty.

[0049] When the second control strategy is determined in step S6 and step S8 is executed: After the air conditioner is controlled to operate according to the second control strategy, the current outdoor heat exchanger temperature T3 is obtained and the cooling rate K of the outdoor heat exchanger temperature is calculated; if the cooling rate K is greater than the first preset rate Q1, it is determined that the outer ring temperature sensor is faulty. Wherein, the cooling rate K = |T3- T0| / (N 1+ N3).

[0050] When the cooling rate is less than the first preset rate and greater than or equal to the second preset rate, the heat exchange effect of the heat exchanger is more obvious during operation. At this time, the compressor frequency is increased to improve the heat exchange effect of the heat exchanger. If the outdoor heat exchanger temperature drops significantly, it means that the actual outer ring temperature is not too low. This can be used to verify the actual outdoor temperature and determine whether the outer ring temperature sensor is faulty.

[0051] When the third control strategy is determined in step S6 and step S8 is executed: After the air conditioner operates for a fourth preset duration N4 according to the third control strategy, the current outdoor heat exchanger temperature T4 and the current inner heat exchanger temperature R1 are obtained. The outdoor heat exchanger temperature drop rate K and the inner heat exchanger temperature rise rate are calculated. The drop rate K = |T4 - T0| / (N1 + N4), and the inner heat exchanger temperature difference is |R1 - R0|. If the drop rate K is greater than the first preset rate Q and the difference |R1 - R0| is greater than the third preset temperature value X, a fault is determined for the outer heat exchanger temperature sensor.

[0052] When the cooling rate is less than the second preset rate, the heat exchange effect of the heat exchanger is not obvious during operation. At this time, the compressor frequency is increased to a greater extent to improve the heat exchange effect of the heat exchanger. If the outdoor heat exchanger temperature drops significantly, it means that the actual outer ring temperature is not too low. Furthermore, the inner ring temperature change is combined to continue to determine that in the case of ultra-low temperature, the air conditioner no longer has a strong heating effect, and the temperature of the indoor environment will not have a large temperature change. This can more accurately determine whether the outer ring temperature sensor is faulty.

[0053] If the result of the determination in step S3 is no, step S9 is executed to determine whether a second preset condition is met. The second preset condition is: the current operating mode is the cooling mode.

[0054] If the judgment result of step S9 is yes, step S10 is executed to determine whether the outer ring temperature sensor is faulty. If the current operating mode is cooling mode, and the outer ring temperature, outdoor heat exchanger temperature, and compressor temperature are all less than the first preset temperature value, the outdoor environment is actually at a high temperature, and the outer ring temperature sensor is determined to be faulty.

[0055] If the judgment result of step S9 is no, the third preset condition is met, which is that the current operating mode is heating mode, and the difference between the minimum value of the outdoor heat exchanger temperature and the compressor temperature and the outer ring temperature is less than the second preset temperature value U.

[0056] At this time, step S11 is executed to control the air conditioner to operate with the compressor self-preheating function.

[0057] Then, step S12 is executed to determine whether the exhaust gas temperature and the bottom temperature of the machine have increased.

[0058] If the judgment result of step S12 is yes, step S13 is executed to determine that the outer ring temperature sensor is not faulty; otherwise, the judgment result is no and step S10 is executed to determine that the outer ring temperature sensor is faulty. In other words, the present invention determines whether the outer ring temperature sensor is faulty based on the changes in the compressor temperature. If multiple temperatures all show low temperatures and the difference between the outer ring temperature and other temperatures is small, the compressor will operate with the self-preheating function. If the compressor exhaust temperature and the temperature of the compressor bottom rise rapidly, the exhaust temperature sensor is determined to be normal and all the temperature values ​​collected for the first time are actual temperature values. At this point, it is determined that the outer ring temperature sensor is normal and not faulty.

[0059] It should be noted that this embodiment is only a specific example of the control method of the present invention. The control method of the present invention does not limit the order of determining the first preset condition, the second preset condition, and the third preset condition.

[0060] Readable storage medium embodiment The readable storage medium of the present invention can be any form of storage medium that can be read by the processor of a computer device, including but not limited to non-volatile memory, volatile memory, ferroelectric memory, etc. The readable storage medium stores a computer program. When the processor of the computer device reads and executes the computer program stored in the memory, the steps of the above-mentioned external ring temperature sensor fault detection method can be implemented.

[0061] The computer program includes computer program code, which may be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium may include any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal, and software distribution medium. It should be noted that the content of the computer-readable medium may be appropriately increased or decreased based on the requirements of legislation and patent practice within a jurisdiction. For example, in some jurisdictions, based on legislation and patent practice, computer-readable media does not include electric carrier signals and telecommunication signals.

[0062] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is 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. The outer ring temperature sensor fault detection method includes: Obtain the outer ring temperature through the outer ring temperature sensor, obtain the outdoor heat exchanger temperature through the outdoor heat exchanger temperature sensor, and obtain the compressor temperature; Its characteristics are: When a first preset condition is met, controlling the air conditioner to operate in a heating mode for a first preset time period according to the outer ring temperature; Calculating a cooling rate of the outdoor heat exchanger temperature, and determining a control strategy based on a relationship between the cooling rate and a preset rate, the control strategy including adjusting a compressor frequency; After controlling the operation of the air conditioner according to the determined control strategy, determining whether the outer ring temperature sensor is faulty according to the temperature of the outdoor heat exchanger; Among them, the first preset condition is: the current operating mode is the heating mode, the outer ring temperature, the outdoor heat exchanger temperature and the compressor temperature are all less than the first preset temperature value, and the difference between the minimum value of the outdoor heat exchanger temperature and the compressor temperature and the outer ring temperature is greater than or equal to the second preset temperature value.

2. The outer ring temperature sensor fault detection method according to claim 1, characterized in that: In the step of determining the control strategy according to the relationship between the cooling rate and the preset rate: When the cooling rate is greater than or equal to the first preset rate, the control strategy is determined to be the first control strategy: controlling the compressor to reduce the frequency and operate for a second preset time; When the cooling rate is less than the first preset rate and greater than or equal to the second preset rate, the control strategy is determined to be the second control strategy: increasing the compressor frequency by the first variable and running for a third preset time; When the cooling rate is less than the second preset rate, the control strategy is determined to be a third control strategy: increasing the compressor frequency by a second variable and running for a fourth preset time, wherein the second variable is greater than the first variable.

3. The outer ring temperature sensor fault detection method according to claim 2, characterized in that: After the air conditioner is controlled to operate according to the determined control strategy, in the step of determining whether the outer ring temperature sensor is faulty according to the outdoor heat exchanger temperature after the operation: After the air conditioner is controlled to operate according to the first control strategy, if the temperature of the outdoor heat exchanger after the operation is lower than the temperature of the outdoor heat exchanger before the operation, it is determined that the outer ring temperature sensor is faulty.

4. The outer ring temperature sensor fault detection method according to claim 2, characterized in that: After the air conditioner is controlled to operate according to the determined control strategy, in the step of determining whether the outer ring temperature sensor is faulty according to the outdoor heat exchanger temperature after the operation: After controlling the operation of the air conditioner according to the second control strategy, calculating the cooling rate of the outdoor heat exchanger temperature; If the cooling rate is greater than the first preset rate, it is determined that the outer ring temperature sensor is faulty.

5. The outer ring temperature sensor fault detection method according to claim 2, characterized in that: After the air conditioner is controlled to operate according to the determined control strategy, in the step of determining whether the outer ring temperature sensor is faulty according to the outdoor heat exchanger temperature after the operation: After controlling the operation of the air conditioner according to the third control strategy, calculating the cooling rate of the outdoor heat exchanger temperature and the change difference of the inner ring temperature; If the cooling rate is greater than the first preset rate and the change difference is greater than a third preset temperature value, it is determined that the outer ring temperature sensor is faulty.

6. The outer ring temperature sensor fault detection method according to any one of claims 2 to 5, characterized in that: The second control strategy and the third control strategy also include increasing the rotation speed of the outdoor fan.

7. The outer ring temperature sensor fault detection method according to any one of claims 1 to 5, characterized in that: After obtaining the outer ring temperature through the outer ring temperature sensor, obtaining the outdoor heat exchanger temperature through the outdoor heat exchanger temperature sensor, and obtaining the compressor temperature, the following steps are further performed: If the second preset condition is met, determining that the outer ring temperature sensor is faulty; The second preset condition is that the current operating mode is the cooling mode, and the outer ring temperature, the outdoor heat exchanger temperature, and the compressor temperature are all lower than a first preset temperature value.

8. The outer ring temperature sensor fault detection method according to any one of claims 1 to 5, characterized in that: After obtaining the outer ring temperature through the outer ring temperature sensor, obtaining the outdoor heat exchanger temperature through the outdoor heat exchanger temperature sensor, and obtaining the compressor temperature, the following steps are further performed: If the third precondition is met: controlling the air conditioner to operate with the compressor self-preheating function, and determining whether the outer ring temperature sensor is faulty based on changes in the compressor temperature; The third preset condition is: the current operating mode is the heating mode, the outer ring temperature, the outdoor heat exchanger temperature and the compressor temperature are all lower than the first preset temperature value, and the difference between the minimum value of the outdoor heat exchanger temperature and the compressor temperature and the outer ring temperature is lower than the second preset temperature value.

9. An air conditioner, characterized in that: The system comprises a processor configured to implement the outer ring temperature sensor fault detection method according to any one of claims 1 to 8 when executing a computer program stored in a memory.

10. A readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for detecting a fault of an outer ring temperature sensor as claimed in any one of claims 1 to 8 is implemented.

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