Oil temperature sensing bag fault detection method, device and air conditioner

Abstract

The application provides an oil temperature sensing bag fault detection method and device and an air conditioner. The method comprises the following steps: obtaining the operating parameters of the compressor when the stable operation time of the air conditioner reaches a first preset time; determining whether the oil temperature sensing bag has a falling fault according to the exhaust gas superheat degree, the suction gas superheat degree, the oil temperature superheat degree and a preset superheat threshold; if yes, generating the falling fault type of the oil temperature sensing bag according to the oil temperature safety temperature and a preset temperature threshold; wherein, the first fault type is used to represent that the distance between the falling position of the oil temperature sensing bag and the compressor is less than a preset distance threshold, and the second fault type is used to represent that the distance between the falling position of the oil temperature sensing bag and the gas-liquid separator is less than a preset distance threshold. In the above detection method, the operating parameters are used to detect whether the oil temperature sensing bag has a falling fault and determine the falling position, thereby reducing the risk of compressor damage caused by the falling of the oil temperature sensing bag and improving the reliability of the air conditioner.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a method, device, and air conditioner for detecting faults in an oil temperature sensor. Background Technology

[0002] During air conditioner operation, oil temperature is a crucial parameter controlling compressor operation and is typically detected by an oil temperature sensor. This sensor is usually installed on the oil return auxiliary pipe near the compressor's suction port. However, due to pipe resonance during compressor operation, the oil temperature sensor often falls off, making it impossible to promptly determine if the compressor is low on oil, potentially leading to compressor damage. Therefore, how to detect if the oil temperature sensor has fallen off to prevent compressor damage is a pressing issue that needs to be addressed. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method, device and air conditioner for detecting oil temperature sensor failure, so as to alleviate the above problems. By detecting whether the oil temperature sensor has fallen off through operating parameters and determining the location of the fall, the risk of compressor damage caused by the fall of the oil temperature sensor is reduced and the reliability of the air conditioner is improved.

[0004] In a first aspect, embodiments of the present invention provide a method for detecting oil temperature sensing bulb faults. The method includes: when the air conditioner has been running stably for a first preset time, acquiring the operating parameters of the compressor; wherein the operating parameters include: exhaust superheat, suction superheat, oil temperature superheat, and oil temperature safety temperature, the oil temperature safety temperature being used to characterize the temperature difference between the oil temperature and the outdoor ambient temperature; determining whether the oil temperature sensing bulb has fallen off based on the exhaust superheat, suction superheat, oil temperature superheat, and a preset superheat threshold; if so, generating a falling off fault type of the oil temperature sensing bulb based on the oil temperature safety temperature and the preset temperature threshold; wherein the falling off fault type includes a first fault type and a second fault type, the first fault type being used to characterize that the distance between the falling position of the oil temperature sensing bulb and the compressor is less than a preset distance threshold, and the second fault type being used to characterize that the distance between the falling position of the oil temperature sensing bulb and the gas-liquid separator is less than a preset distance threshold.

[0005] The above-mentioned oil temperature sensor fault detection method detects whether the oil temperature sensor has fallen off by checking the operating parameters and determines the location of the fall, so as to notify the relevant maintenance personnel in a timely manner. This reduces the risk of compressor damage caused by the fall of the oil temperature sensor, improves the reliability of the air conditioner, and thus improves the user's air conditioning comfort.

[0006] Preferably, the aforementioned preset superheat threshold includes a first superheat threshold, a second superheat threshold, a third superheat threshold, and a fourth superheat threshold; the step of determining whether the oil temperature sensor has fallen off based on the exhaust superheat, intake superheat, oil temperature superheat, and the preset superheat threshold includes: determining whether the air conditioner is in normal operation based on the exhaust superheat, intake superheat, the first superheat threshold, the second superheat threshold, and the third superheat threshold; if so, determining whether the oil temperature sensor has fallen off based on the oil temperature superheat and the fourth superheat threshold.

[0007] Preferably, the step of determining whether the air conditioner is in normal operation based on the exhaust superheat, intake superheat, first superheat threshold, second superheat threshold and third superheat threshold includes: determining whether the exhaust superheat is greater than the first superheat threshold, whether the intake superheat is greater than the second superheat threshold and less than the third superheat threshold; if all are true, the air conditioner is determined to be in normal operation.

[0008] Preferably, the step of determining whether the oil temperature sensor has fallen off based on the oil temperature overheating degree and the fourth overheating threshold includes: determining whether the oil temperature overheating degree is less than the fourth overheating threshold and whether the duration reaches the second preset duration; if so, determining that the oil temperature sensor has fallen off.

[0009] Preferably, the preset temperature thresholds include a first temperature threshold, a second temperature threshold, and a third temperature threshold; wherein, the first temperature threshold > the second temperature threshold > the third temperature threshold; the step of generating the drop fault type of the oil temperature sensor based on the oil temperature safety temperature and the preset temperature thresholds includes: if the oil temperature safety temperature is less than the first temperature threshold and greater than the second temperature threshold, and the duration reaches a third preset duration, the drop fault type is generated as the first fault type.

[0010] Preferably, the step of generating the drop fault type of the oil temperature sensor based on the oil temperature safety temperature and the preset temperature threshold includes: if the oil temperature safety temperature is not greater than the second temperature threshold and not less than the third temperature threshold, and the duration reaches the fourth preset duration, the drop fault type is generated as the second fault type.

[0011] Preferably, the above method further includes: if the oil temperature safety temperature is less than the third temperature threshold and the duration reaches the fifth preset duration, it is determined that the compressor is short of oil.

[0012] Secondly, embodiments of the present invention also provide an oil temperature sensing element fault detection device, the device comprising: an acquisition module, configured to acquire compressor operating parameters when the air conditioner has been running stably for a first preset time; wherein the operating parameters include: exhaust superheat, suction superheat, oil temperature superheat, and oil temperature safety temperature, the oil temperature safety temperature being used to characterize the temperature difference between the oil temperature and the outdoor ambient temperature; a judgment module, configured to determine whether the oil temperature sensing element has fallen off based on the exhaust superheat, suction superheat, oil temperature superheat, and a preset superheat threshold; and a generation module, configured to generate a falling off fault type of the oil temperature sensing element based on the oil temperature safety temperature and the preset temperature threshold if the fault is found; wherein the falling off fault type includes a first fault type and a second fault type, the first fault type being used to characterize that the distance between the falling position of the oil temperature sensing element and the compressor is less than a preset distance threshold, and the second fault type being used to characterize that the distance between the falling position of the oil temperature sensing element and the gas-liquid separator is less than a preset distance threshold.

[0013] Thirdly, embodiments of the present invention also provide an air conditioner, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the oil temperature sensor fault detection method described in the first aspect.

[0014] Fourthly, embodiments of the present invention also provide a computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, performs the steps of the oil temperature sensor fault detection method described in the first aspect.

[0015] The embodiments of the present invention bring the following beneficial effects:

[0016] This invention provides a method, device, and air conditioner for detecting oil temperature sensor malfunctions. When the air conditioner has been running stably for a first preset period, the compressor's operating parameters are first acquired. Based on the exhaust superheat, suction superheat, oil temperature superheat, and a preset superheat threshold, it is determined whether the oil temperature sensor has fallen off. If so, a malfunction type is generated based on the oil temperature safety temperature and a preset temperature threshold. The first malfunction type indicates that the distance between the fallen oil temperature sensor and the compressor is less than a preset distance threshold, and the second malfunction type indicates that the distance between the fallen oil temperature sensor and the gas-liquid separator is less than a preset distance threshold. This detection method detects whether the oil temperature sensor has fallen off by checking the operating parameters and determines the malfunction type, i.e., the different falling locations of the oil temperature sensor, so as to promptly notify relevant maintenance personnel. This reduces the risk of compressor damage due to the fallen oil temperature sensor, improves the reliability of the air conditioner, and ultimately enhances the user's air conditioning comfort.

[0017] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A flowchart of a method for detecting oil temperature sensor faults provided in an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the structure of an outdoor unit provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of an oil temperature sensing bulb fault detection device provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of an air conditioner provided in an embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] To facilitate understanding of this embodiment, the embodiments of the present invention will be described in detail below.

[0026] Example 1:

[0027] This invention provides a method for detecting oil temperature sensor faults, applicable to air conditioners; such as... Figure 1 As shown, the method includes the following steps:

[0028] Step S102: When the air conditioner has been running stably for a first preset time, the operating parameters of the compressor are obtained; wherein, the operating parameters include: exhaust superheat, suction superheat, oil superheat and oil safe temperature.

[0029] Specifically, when the air conditioner has been running stably for a first preset time (preferably 10 minutes, but this can be adjusted adaptively according to actual conditions), the controller identifies and acquires the compressor's operating parameters in real time or periodically. These operating parameters include: discharge superheat TdSH, suction superheat TsSH, oil superheat ToSH, and oil safety temperature ToSA. Discharge superheat TdSH can be calculated based on the compressor's discharge temperature and high-pressure saturation temperature, and is used to assess whether there is a risk of liquid carryover during the compressor's discharge process. Suction superheat TsSH can be calculated based on the compressor's suction temperature and low-pressure saturation temperature, and is used to assess whether there is a risk of liquid carryover during the compressor's suction process. Oil superheat ToSH can be calculated based on the oil temperature and high-pressure saturation temperature, and is used to assess whether the compressor is short of oil during operation. Oil safety temperature ToSA characterizes the temperature difference between the oil temperature and the outdoor ambient temperature, and can be calculated based on the oil temperature and the outdoor ambient temperature, used to assess whether the oil temperature is close to the outdoor ambient temperature. Therefore, each of the above operating parameters can be determined based on its corresponding temperature parameter.

[0030] For each temperature parameter, exhaust temperature, intake temperature, and oil temperature can be obtained through corresponding temperature sensors. For example... Figure 2 As shown, the outdoor unit of the air conditioner includes, but is not limited to: a compressor 21, an oil separator 22, a gas-liquid separator 23, a four-way valve 24, a condenser 25, a suction temperature sensor 26, a discharge temperature sensor 27, and an oil temperature sensor 28. The suction temperature sensor 26 is located on the main suction line near the suction port of the compressor 21 and close to the gas-liquid separator 23, and is used to detect the suction temperature Ts of the compressor 21. The discharge temperature sensor 27 is located on the main discharge line near the discharge port of the compressor 21 and is used to detect the discharge temperature Td of the compressor 21. The oil temperature sensor 28 is located on the oil return auxiliary line near the suction port of the compressor 21 and is used to detect the oil temperature To flowing out from the oil separator 22. The specific structure of the outdoor unit can be referenced from existing air conditioners; this embodiment of the invention will not be described in detail here.

[0031] In addition, a temperature sensor can be installed on the outdoor unit to detect the outdoor ambient temperature Ta; or the controller can also acquire the outdoor ambient temperature Ta sent by a remote terminal, which can be an electronic device with ambient temperature detection software, such as a mobile phone or computer. The specific method of acquiring the outdoor ambient temperature Ta can be set according to the actual situation.

[0032] Therefore, based on the above temperature parameters, the process for determining each operating parameter is as follows:

[0033] (1) Exhaust superheat TdSH = Exhaust temperature Td - High pressure saturation temperature Tc;

[0034] (2) Suction superheat TsSH = Suction temperature Ts - Low-pressure saturation temperature Te;

[0035] (3) Oil temperature superheat ToSH = Oil temperature To - High pressure saturation temperature Tc;

[0036] (4) Oil temperature safety temperature ToSA = Oil temperature To - Outdoor ambient temperature Ta;

[0037] The high-pressure saturation temperature Tc and the low-pressure saturation temperature Te can be calculated by detecting the high and low pressures using pressure sensors at the compressor's intake and exhaust ports. It should be noted that the calculations (1) to (4) above can be performed in a specific order or simultaneously. In this embodiment of the invention, simultaneous calculation is preferred, but the specific settings can be adjusted according to the actual situation.

[0038] Step S104: Based on the exhaust superheat, intake superheat, oil temperature superheat and preset superheat threshold, determine whether the oil temperature sensor has fallen off.

[0039] After obtaining the above operating parameters, the system uses the exhaust superheat TdSH, intake superheat TsSH, oil superheat ToSH, and preset superheat threshold to jointly determine whether the oil temperature sensor has fallen off. This allows for timely notification of relevant maintenance personnel when the oil temperature sensor falls off, reducing the risk of compressor damage caused by the fall off and thus improving the reliability of the air conditioner.

[0040] Step S106: If yes, generate the oil temperature sensor drop fault type based on the oil temperature safety temperature and the preset temperature threshold.

[0041] When it is determined that the oil temperature sensor has fallen, due to pipeline resonance, the oil temperature sensor may fall near the compressor or near the gas-liquid separator. Therefore, it is necessary to generate a fault type for the oil temperature sensor based on the oil temperature safety temperature and the preset temperature threshold. The fault type includes a first fault type and a second fault type. The first fault type indicates that the distance between the oil temperature sensor and the compressor is less than the preset distance threshold, and the second fault type indicates that the distance between the oil temperature sensor and the gas-liquid separator is less than the preset distance threshold.

[0042] The "fall-off fault type" can also be understood as a classification of the location where the oil temperature sensor falls off. The first fault type is when the oil temperature sensor falls near the compressor. This is indicated by the distance between the oil temperature sensor and the compressor being less than a preset distance threshold. Similarly, the second fault type is when the oil temperature sensor falls near the gas-liquid separator. This is also indicated by the distance between the oil temperature sensor and the gas-liquid separator being less than a preset distance threshold.

[0043] Therefore, when the oil temperature sensor falls off, the type of failure can be determined by the oil temperature safety temperature and the preset temperature threshold. This also makes it easier for relevant maintenance personnel to repair the oil temperature sensor in a timely manner according to the type of failure. This not only reduces the risk of compressor damage caused by the oil temperature sensor falling off, but also improves the efficiency of fault diagnosis and repair of the oil temperature sensor.

[0044] This invention provides a method for detecting oil temperature sensor malfunctions. By detecting whether the oil temperature sensor has fallen off through operating parameters, the method determines the type of malfunction, i.e., the different locations where the oil temperature sensor has fallen off, so as to notify relevant maintenance personnel in a timely manner. This reduces the risk of compressor damage caused by the oil temperature sensor falling off, improves the reliability of the air conditioner, and thus improves the user's air conditioning comfort.

[0045] In one embodiment, the aforementioned preset superheat thresholds include a first superheat threshold SH1, a second superheat threshold SH2, a third superheat threshold SH3, and a fourth superheat threshold SH4; wherein, the value range of the first superheat threshold SH1 is 10℃ < SH1 < 20℃, the second superheat threshold SH2 is preferably 0℃, the value range of the third superheat threshold SH3 is 10℃ < SH3 < 15℃, and the value range of the fourth superheat threshold SH4 is SH4 ≥ 20℃. The specific values ​​of SH1, SH3, and SH4 can be set according to actual conditions.

[0046] Specifically, the steps for determining whether the oil temperature sensor has malfunctioned due to a fall-off, based on exhaust superheat, intake superheat, oil temperature superheat, and a preset superheat threshold, include:

[0047] (A1) Determine whether the air conditioner is in normal operating condition based on the exhaust superheat, intake superheat, first superheat threshold, second superheat threshold and third superheat threshold.

[0048] Specifically, it is determined whether the exhaust superheat is greater than the first superheat threshold, whether the intake superheat is greater than the second superheat threshold, and whether it is less than the third superheat threshold; if all are true, the air conditioner is determined to be in normal operating condition. That is, the following judgments are performed: ① Determine whether TdSH > SH1; ② Determine whether SH2 < TsSH < SH3; if both ① and ② are true, the air conditioner is determined to be in normal operating condition.

[0049] During air conditioner operation, both the discharge superheat (TdSH) and suction superheat (TsSH) of the compressor exist within a normal range, which is related to the air conditioner's own equipment parameters and its operating environment. If both discharge superheat (TdSH) and suction superheat (TsSH) are within their respective normal ranges, the air conditioner can be determined to be in normal operating condition. Under normal operating condition, there is no risk of liquid carryover during the compressor's discharge process, and similarly, there is no risk of liquid carryover during the compressor's suction process. Therefore, in this embodiment of the invention, when TdSH > SH1 and SH2 < TsSH < SH3, the air conditioner is determined to be in normal operating condition.

[0050] (A2) If so, determine whether the oil temperature sensor has fallen off based on the oil temperature overheating and the fourth overheating threshold.

[0051] Specifically, when the air conditioner is in normal operation, it is determined whether the oil temperature superheat is less than the fourth superheat threshold, and whether the duration reaches the second preset time; if so, it is determined that the oil temperature sensor has fallen off. The second preset time is preferably 10 minutes, but can be adjusted according to actual conditions.

[0052] During normal operation of the air conditioner, when the compressor has sufficient oil, the oil temperature is close to the compressor's discharge temperature and is higher than the high-pressure saturation temperature because it is discharged from the compressor. When the oil superheat (ToSH) remains below a certain value (SH4 in this case), it indicates that there may be a lack of oil in the oil return circuit or that the oil temperature sensor has fallen off. This rule out misjudgment due to temperature fluctuations caused by electromagnetic interference. Therefore, when ToSH < SH4 and the duration reaches 10 minutes, it is determined that the oil temperature sensor has fallen off or the compressor is short of oil. The scenario of the oil temperature sensor falling off is described in detail here.

[0053] It should be noted that if ToSH > SH4, or if ToSH < SH4 but the duration is less than 10 minutes, the air conditioner will continue to operate in the specified mode without needing to determine whether the oil temperature sensor has fallen off.

[0054] In one embodiment, the preset temperature thresholds include a first temperature threshold T1, a second temperature threshold T2, and a third temperature threshold T3; wherein, the first temperature threshold > the second temperature threshold > the third temperature threshold, i.e., T1 > T2 > T3; here, the first temperature threshold T1 has a value range of 100℃, the second temperature threshold T2 has a value range of 2℃, and the third temperature threshold T3 has a value range of -2℃. The specific values ​​of T1, T2, and T3 can be adaptively adjusted according to the actual situation.

[0055] For ease of explanation, the range (T2, T1) will be referred to as interval B, and the range [T3, T2] will be referred to as interval C. Specifically, the process of generating the oil temperature sensor drop fault type based on the oil temperature safety temperature and the preset temperature threshold is as follows:

[0056] (1) If the oil temperature safety temperature is less than the first temperature threshold and greater than the second temperature threshold, and the duration reaches the third preset duration, the drop fault type is generated as the first fault type.

[0057] Specifically, when T2 < ToSA < T1 (i.e., ToSA ∈ B), and the duration reaches the third preset duration, a first fault type is generated, indicating that the oil temperature sensor has fallen off, and the oil temperature sensor has fallen near or close to the compressor. The third preset duration is preferably 10 minutes, but can be adjusted adaptively according to actual conditions.

[0058] (2) If the oil temperature safety temperature is not greater than the second temperature threshold and is not less than the third temperature threshold, and the duration reaches the fourth preset duration, the falling fault type is generated as the second fault type.

[0059] Specifically, when T3≤ToSA≤T2 (i.e., ToSA∈C), and the duration reaches the fourth preset duration, a second fault type is generated, indicating that the oil temperature sensor has fallen off, and the falling location of the oil temperature sensor is near or close to the gas-liquid separator. The fourth preset duration is preferably 10 minutes, but can be adjusted adaptively according to actual conditions.

[0060] When the oil temperature sensor falls off, the temperature difference (ToSA) between the sensor and the ambient outdoor temperature (Ta) may be B or C due to the presence of a heat source (compressor) or a cold source (gas-liquid separator) around it. Therefore, based on the oil temperature safety temperature and the preset temperature threshold, the type of oil temperature sensor fall fault can be generated, thus determining the location of the fall. This allows for timely notification of relevant maintenance personnel, enabling them to repair the oil temperature sensor promptly based on the fault type. This not only reduces the risk of compressor damage caused by the oil temperature sensor falling off but also improves the efficiency of fault diagnosis and repair.

[0061] In one embodiment, the method further includes: if the oil temperature safety temperature is less than a third temperature threshold and the duration reaches a fifth preset duration, it is determined that the compressor is short of oil.

[0062] Specifically, when the compressor experiences an oil shortage, refrigerant flows through the oil return auxiliary circuit. The refrigerant undergoes a phase change after being throttled through the capillary tube and absorbs heat from the environment, resulting in the oil temperature safety temperature ToSA being less than -2℃ (i.e., T3) due to the temperature difference between the oil temperature sensor (To) and the outdoor ambient temperature Ta. Therefore, if ToSA < -2℃ and this condition persists for a duration equal to the fifth preset time, the compressor is determined to be short of oil. The fifth preset time is preferably 10 minutes, but can be adjusted according to actual conditions.

[0063] Therefore, this embodiment of the invention can not only detect whether the oil temperature sensor has fallen off, but also detect the location of the fall, so that relevant maintenance personnel can repair the oil temperature sensor in a timely manner according to the type of failure caused by the fall, thus reducing the risk of compressor damage caused by the fall of the oil temperature sensor; it can also detect whether the compressor is short of oil, thereby improving the reliability of the air conditioner and thus improving the user's air conditioning comfort.

[0064] Example 2:

[0065] To make it easier to understand, an example is given here. The oil temperature sensor fault detection process mainly includes the following steps:

[0066] (1) After the air conditioner has been running stably for Emin since its start-up, it automatically detects the exhaust superheat TdSH and the intake superheat TsSH; at the same time, it detects that the oil temperature To is 50℃, the outdoor ambient temperature Ta is 5℃, and the high-pressure saturation temperature Tc is 40℃, and sets the first superheat threshold SH1 = 15℃ and the third superheat threshold SH3 = 12℃; and judges that the air conditioner is running normally based on TdSH and TsSH.

[0067] (2) Continuously monitor To and Ta. When To drops to 10℃ at a certain moment, Ta and Tc remain unchanged. When To drops to 40℃, ToSH < 0℃. The time accumulation judgment is carried out for ten minutes after that moment. If ToSH is still < 0℃ within E minutes, the next step is to judge the failure of the oil temperature sensor falling off.

[0068] (3) When ToSA starts to fall below 10°C, the duration is recorded. If ToSA remains in the B range after E minutes, the oil temperature sensor drop fault type is identified as the first fault type, indicating that the oil temperature sensor has fallen near or close to the compressor. Furthermore, relevant maintenance personnel should be notified promptly to facilitate timely repair of the oil temperature sensor based on the fault type. This not only reduces the risk of compressor damage due to the oil temperature sensor falling but also improves the efficiency of fault diagnosis and repair.

[0069] Example 3:

[0070] Corresponding to the above method embodiments, this invention also provides an oil temperature sensing bulb fault detection device, such as... Figure 3 As shown, the device includes: an acquisition module 31, a judgment module 32, and a generation module 33; wherein the functions of each module are as follows:

[0071] The acquisition module 31 is used to acquire the compressor's operating parameters when the air conditioner has been running stably for a first preset time. The operating parameters include: exhaust superheat, suction superheat, oil superheat, and oil temperature safety temperature. The oil temperature safety temperature is used to characterize the temperature difference between the oil temperature and the outdoor ambient temperature.

[0072] The judgment module 32 is used to determine whether the oil temperature sensor has fallen off based on the exhaust superheat, intake superheat, oil temperature superheat and preset superheat threshold.

[0073] The generation module 33 is used to generate, if so, a drop fault type for the oil temperature sensor based on the oil temperature safety temperature and a preset temperature threshold. The drop fault type includes a first fault type and a second fault type. The first fault type indicates that the distance between the drop position of the oil temperature sensor and the compressor is less than a preset distance threshold, and the second fault type indicates that the distance between the drop position of the oil temperature sensor and the gas-liquid separator is less than a preset distance threshold.

[0074] This invention provides an oil temperature sensor fault detection device. It detects whether the oil temperature sensor has fallen off by measuring operating parameters and determines the type of fault, i.e., the different locations where the oil temperature sensor has fallen off, so as to notify relevant maintenance personnel in a timely manner. This reduces the risk of compressor damage caused by the oil temperature sensor falling off, improves the reliability of the air conditioner, and thus improves the user's air conditioning comfort.

[0075] Preferably, the preset superheat threshold includes a first superheat threshold, a second superheat threshold, a third superheat threshold, and a fourth superheat threshold; the judgment module 32 is further configured to: determine whether the air conditioner is in normal operation based on the exhaust superheat, intake superheat, the first superheat threshold, the second superheat threshold, and the third superheat threshold; if so, determine whether the oil temperature sensor has fallen off based on the oil temperature superheat and the fourth superheat threshold.

[0076] Preferably, the above-mentioned determination of whether the air conditioner is in normal operation based on the exhaust superheat, intake superheat, first superheat threshold, second superheat threshold and third superheat threshold includes: determining whether the exhaust superheat is greater than the first superheat threshold, whether the intake superheat is greater than the second superheat threshold and less than the third superheat threshold; if all are true, the air conditioner is determined to be in normal operation.

[0077] Preferably, the above-mentioned determination of whether the oil temperature sensor has fallen off based on the oil temperature superheat and the fourth superheat threshold includes: determining whether the oil temperature superheat is less than the fourth superheat threshold and whether the duration reaches the second preset duration; if so, determining that the oil temperature sensor has fallen off.

[0078] Preferably, the preset temperature thresholds include a first temperature threshold, a second temperature threshold, and a third temperature threshold; wherein, the first temperature threshold > the second temperature threshold > the third temperature threshold; the generation module 33 is further configured to: if the oil temperature safety temperature is less than the first temperature threshold and greater than the second temperature threshold, and the duration reaches a third preset duration, generate a drop fault type as the first fault type.

[0079] Preferably, the above-mentioned generation module 33 is further configured to: if the oil temperature safety temperature is not greater than the second temperature threshold and is not less than the third temperature threshold, and the duration reaches the fourth preset duration, generate the drop fault type as the second fault type.

[0080] Preferably, the above-mentioned device further includes: if the oil temperature safety temperature is less than the third temperature threshold and the duration reaches the fifth preset duration, it is determined that the compressor is short of oil.

[0081] The oil temperature sensor fault detection device provided in this embodiment of the invention has the same technical features as the oil temperature sensor fault detection method provided in the above embodiment, so it can also solve the same technical problems and achieve the same technical effects.

[0082] This invention also provides an air conditioner, including a processor and a memory. The memory stores machine-executable instructions that can be executed by the processor. The processor executes the machine-executable instructions to implement the above-mentioned oil temperature sensor fault detection method.

[0083] See Figure 4 As shown, the air conditioner includes a processor 100 and a memory 101. The memory 101 stores machine-executable instructions that can be executed by the processor 100. The processor 100 executes the machine-executable instructions to implement the above-mentioned oil temperature sensor fault detection method.

[0084] Furthermore, Figure 4 The air conditioner shown also includes a bus 102 and a communication interface 103. The processor 100, the communication interface 103 and the memory 101 are connected via the bus 102.

[0085] The memory 101 may include high-speed random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 103 (which can be wired or wireless), such as the Internet, wide area network, local area network, or metropolitan area network. The bus 102 may be an ISA (Industrial Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Enhanced Industry Standard Architecture) bus. These buses can be categorized as address buses, data buses, and control buses. For ease of representation, Figure 4 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0086] Processor 100 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of processor 100 or by instructions in software form. Processor 100 may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it may also be 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, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this invention can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software module can reside in a readily available storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory 101, and the processor 100 reads the information from memory 101 and, in conjunction with its hardware, completes the steps of the method described in the foregoing embodiments.

[0087] This embodiment also provides a machine-readable storage medium storing machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions cause the processor to implement the above-mentioned oil temperature sensor fault detection method.

[0088] The oil temperature sensor fault detection method, device, and air conditioner computer program product provided in the embodiments of the present invention include a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the methods described in the preceding method embodiments. For specific implementation, please refer to the method embodiments, which will not be repeated here.

[0089] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0090] Furthermore, in the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0091] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0092] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0093] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for detecting faults in an oil temperature sensor, characterized in that, The method includes: When the air conditioner has been running stably for a first preset time, the operating parameters of the compressor are acquired; wherein, the operating parameters include: exhaust superheat, suction superheat, oil superheat and oil temperature safety temperature, wherein the oil temperature safety temperature is used to characterize the temperature difference between the oil temperature and the outdoor ambient temperature; Based on the exhaust superheat, intake superheat, oil temperature superheat, and preset superheat threshold, determine whether the oil temperature sensor has fallen off. If so, based on the oil temperature safety temperature and the preset temperature threshold, a drop fault type for the oil temperature sensing element is generated; wherein, the drop fault type includes a first fault type and a second fault type, the first fault type is used to characterize that the distance between the drop position of the oil temperature sensing element and the compressor is less than the preset distance threshold, and the second fault type is used to characterize that the distance between the drop position of the oil temperature sensing element and the gas-liquid separator is less than the preset distance threshold. The preset superheat threshold includes a first superheat threshold, a second superheat threshold, a third superheat threshold, and a fourth superheat threshold; the step of determining whether the oil temperature sensor has fallen off based on the exhaust superheat, the intake superheat, the oil temperature superheat, and the preset superheat threshold includes: determining whether the air conditioner is in normal operation based on the exhaust superheat, the intake superheat, the first superheat threshold, the second superheat threshold, and the third superheat threshold; if so, determining whether the oil temperature sensor has fallen off based on the oil temperature superheat and the fourth superheat threshold; The step of determining whether the air conditioner is in normal operating condition based on the exhaust superheat, the intake superheat, the first superheat threshold, the second superheat threshold, and the third superheat threshold includes: determining whether the exhaust superheat is greater than the first superheat threshold, whether the intake superheat is greater than the second superheat threshold, and whether it is less than the third superheat threshold; if all are true, the air conditioner is determined to be in normal operating condition. The step of determining whether the oil temperature sensor has fallen off based on the oil temperature overheating degree and the fourth overheating threshold includes: determining whether the oil temperature overheating degree is less than the fourth overheating threshold and whether the duration reaches a second preset duration; if so, determining that the oil temperature sensor has fallen off.

2. The method according to claim 1, characterized in that, The preset temperature threshold includes a first temperature threshold, a second temperature threshold, and a third temperature threshold; wherein, the first temperature threshold > the second temperature threshold > the third temperature threshold; The step of generating the fault type of the oil temperature sensor based on the oil temperature safety temperature and the preset temperature threshold includes: If the oil temperature safety temperature is less than the first temperature threshold and greater than the second temperature threshold, and the duration of this condition reaches a third preset duration, then the drop fault type is generated as the first fault type.

3. The method according to claim 2, characterized in that, The step of generating the fault type of the oil temperature sensor based on the oil temperature safety temperature and the preset temperature threshold includes: If the oil temperature safety temperature is not greater than the second temperature threshold and not less than the third temperature threshold, and the duration reaches the fourth preset duration, the drop fault type is generated as the second fault type.

4. The method according to claim 2, characterized in that, The method further includes: If the oil temperature safety temperature is lower than the third temperature threshold, and the duration of this condition reaches the fifth preset duration, it is determined that the compressor is experiencing an oil shortage.

5. A fault detection device for an oil temperature sensing bulb, characterized in that, The apparatus for implementing the method according to any one of claims 1-4 comprises: The acquisition module is used to acquire the compressor's operating parameters when the air conditioner has been running stably for a first preset time. The operating parameters include: exhaust superheat, suction superheat, oil superheat, and oil temperature safety temperature. The oil temperature safety temperature is used to characterize the temperature difference between the oil temperature and the outdoor ambient temperature. The judgment module is used to determine whether the oil temperature sensor has fallen off based on the exhaust superheat, the intake superheat, the oil temperature superheat, and a preset superheat threshold. The generation module is used to generate, if so, a drop fault type for the oil temperature sensor based on the oil temperature safety temperature and a preset temperature threshold; wherein the drop fault type includes a first fault type and a second fault type, the first fault type is used to characterize that the distance between the drop position of the oil temperature sensor and the compressor is less than a preset distance threshold, and the second fault type is used to characterize that the distance between the drop position of the oil temperature sensor and the gas-liquid separator is less than the preset distance threshold.

6. An air conditioner, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the oil temperature sensing bulb fault detection method according to any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, performs the steps of the oil temperature sensor fault detection method according to any one of claims 1-4.

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