A detection method, a detection device and an air conditioner for an air conditioner

Abstract

The present invention provides a detection method, a detection device and an air conditioner for an air conditioner. The detection method includes: after the air conditioner is powered on, determining whether a first temperature difference value between a plurality of first temperature values collected by a plurality of temperature sensors meets a steady-state condition; if so, obtaining a first temperature reference value according to the plurality of first temperature values; if there is at least one of the plurality of second temperature values whose temperature difference value from the first temperature reference value meets an abnormal temperature difference condition, determining that the temperature sensor corresponding to the second temperature value is abnormal. The technical problem solved by the present invention is that due to the resistance value drift of the temperature sensor or the abnormality of the resistor for voltage division sampling, the temperature detected by the temperature sensor will be abnormal, but when it does not meet the temperature sensor failure condition, it will cause the air conditioning system to operate under the wrong temperature detected by the temperature sensor, resulting in a reduction in the operating efficiency of the air conditioner and affecting the user experience.

Description

Technical Field

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

[0002] In an air conditioner control system, temperature sensors are generally used to collect the temperatures of corresponding controlled objects, such as an indoor ambient temperature sensor, an indoor coil temperature sensor, an outdoor ambient temperature sensor, an outdoor coil temperature sensor, an exhaust gas temperature sensor, etc. Corresponding control of frequency, expansion valve opening, air volume, etc. and various system protections are achieved through the corresponding temperatures.

[0003] Specifically, temperature sensors are generally NTC sensors, which are essentially a kind of thermistor, and the resistance value will decrease as the temperature rises. The control system converts the resistance value of the temperature sensor into a voltage through a voltage division circuit for sampling, and calculates the corresponding temperature value according to the sampling result.

[0004] In the actual use process, due to the resistance value drift of the temperature sensor or the abnormality of the resistance for voltage division sampling, the temperature detected by the temperature sensor will be abnormal. However, when the temperature sensor fault condition is not met, the air conditioner system will operate under the wrong temperature detected by the temperature sensor, resulting in a reduction in the operating efficiency of the air conditioner and affecting the user experience. Summary of the Invention

[0005] The technical problem solved by the present invention is that due to the resistance value drift of the temperature sensor or the abnormality of the resistance for voltage division sampling, the temperature detected by the temperature sensor will be abnormal. However, when the temperature sensor fault condition is not met, the air conditioner system will operate under the wrong temperature detected by the temperature sensor, resulting in a reduction in the operating efficiency of the air conditioner and affecting the user experience.

[0006] To solve the above problems, the present invention provides a detection method for an air conditioner. The air conditioner includes a plurality of temperature sensors. The detection method includes: after the air conditioner is powered on, determining whether a first temperature difference value between a plurality of first temperature values collected by the plurality of temperature sensors meets a steady state condition; if so, obtaining a first temperature reference value according to the plurality of first temperature values; after the compressor shutdown duration of the air conditioner meets a first preset time, collecting a plurality of second temperature values by the plurality of temperature sensors; if the temperature difference value between at least one of the plurality of second temperature values and the first temperature reference value meets an abnormal temperature difference condition, determining that the temperature sensor corresponding to the second temperature value is abnormal.

[0007] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: By detecting multiple first temperature values collected by the temperature sensor at the moment when the air conditioner is powered on, and after making them meet the steady-state conditions, subsequent abnormal discrimination is carried out, which improves the accuracy of the subsequent abnormal detection judgment and avoids carrying out the detection under the condition of a large temperature deviation between multiple first temperature values, thus preventing the reduction of the accuracy of the subsequent abnormal detection. In addition, by collecting multiple second temperature values through multiple temperature sensors after the compressor stops, the self-construction principle of the temperature sensor is fully utilized, that is, abnormal detection is carried out after it experiences temperature changes, which can better reflect the stability of the temperature sensor itself and highlight whether there is an abnormality in the internal resistance after experiencing temperature changes. Specifically, it is manifested by associating multiple second temperature values with the first temperature reference value, further improving the accuracy of abnormal discrimination of the temperature sensor, so that the air conditioner can make a response signal in a timely manner according to the abnormal state in the discrimination result.

[0008] In an example of the present invention, the multiple temperature sensors include a first sensor, a second sensor, and a third sensor; judging whether the first temperature difference value between multiple first temperature values collected by the multiple temperature sensors meets the steady-state conditions includes: if ΔT1≤V1 and ΔT2≤V1, then it is judged that the first temperature difference value between the multiple first temperature values meets the steady-state conditions; where Ta1 is the first outdoor ambient temperature value obtained by the first sensor, Td1 is the first exhaust gas temperature value obtained by the second sensor, Te1 is the first external coil temperature value obtained by the third sensor, V1 is a preset value, ΔT1 = |Ta1 - Td1|, and ΔT2 = |Ta1 - Te1|.

[0009] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: Specifically, since the first sensor, the second sensor, and the third sensor are all arranged in the outdoor environment, when the air conditioner is in standby or powered on, and they are all in normal states, the temperature values collected by the three sensors should be similar values. Therefore, by setting ΔT1 and ΔT2 to be compared with V1 respectively, it is convenient to accurately judge that the three sensors are all in a stable state, that is, when ΔT1≤V1 and ΔT2≤V1, it can be determined that the first sensor, the second sensor, and the third sensor all meet the stable conditions at this time.

[0010] In an example of the present invention, a plurality of temperature sensors include a first sensor, a second sensor, and a third sensor; determining whether a first temperature difference value between a plurality of first temperature values collected by the plurality of temperature sensors satisfies a steady-state condition includes: if ΔT1 > V1 or ΔT2 > V1, after the shutdown duration of the air conditioner satisfies a second preset time, obtaining whether a third temperature difference value between a plurality of third temperature values collected by the plurality of temperature sensors satisfies the steady-state condition; if so, obtaining a second temperature reference value according to the plurality of third temperature values; if the temperature difference value between at least one of the plurality of second temperature values and the second temperature reference value satisfies an abnormal temperature difference condition, determining that the temperature sensor corresponding to the second temperature value is abnormal; where Ta1 is the first outdoor ambient temperature value obtained by the first sensor, Td1 is the first exhaust gas temperature value obtained by the second sensor, and Te1 is the first external coil temperature value obtained by the third sensor; ΔT1 = |Ta1 - Td1|, ΔT2 = |Ta1 - Te1|, V1 is a preset value, and 1°C ≤ V1 ≤ 5°C.

[0011] Compared with the prior art, the technical effects achieved by adopting this technical solution: By collecting temperature values during the stage from the compressor's self-operation to shutdown, it effectively replaces the situation where the steady-state condition is not satisfied at the moment when the air conditioner is powered on, improving the applicability and generality of the detection method, and further improving the reliability of the detection method.

[0012] In an example of the present invention, the first temperature reference value satisfies the following formula 1; Formula 1: Tbase = (Ta1 + Td1 + Te1) / 3; where Tbase is the first temperature reference value.

[0013] Compared with the prior art, the technical effects achieved by adopting this technical solution: Further improving the accuracy of detection.

[0014] In an example of the present invention, determining that the first temperature difference value between a plurality of first temperature values satisfies the steady-state condition includes: marking a steady-state detection flag bit for the plurality of temperature sensors.

[0015] Compared with the prior art, the technical effects achieved by adopting this technical solution: By setting the steady-state detection flag bit, it is convenient for the control system inside the air conditioner to perform statistics, facilitating the subsequent steps of determining whether the temperature sensor is abnormal, and effectively avoiding confusion in identifying the states of a large number of temperature sensors during the detection process.

[0016] In an example of the present invention, the multiple second temperature values include a second outdoor ambient temperature value, a second exhaust gas temperature value, and a second external coil temperature value; if the temperature difference value between at least one of the multiple second temperature values and the first temperature reference value satisfies the abnormal temperature difference condition, it is determined that the temperature sensor corresponding to the second temperature value is abnormal, including: if ΔT3 > V2, it is determined that the first sensor is abnormal; ΔT3 = |Tbase - Ta2|; and / or, if ΔT4 > V2, it is determined that the second sensor is abnormal; ΔT4 = |Tbase - Td2|; and / or, if ΔT5 > V2, it is determined that the third sensor is abnormal; ΔT5 = |Tbase - Te2|; where Ta2 is the second outdoor ambient temperature value, Td2 is the second exhaust gas temperature value, Te2 is the second external coil temperature value, Tbase is the first temperature reference value, V2 is the preset deviation value, and 5°C ≤ V2 ≤ 10°C.

[0017] Compared with the prior art, the technical effect achieved by adopting this technical solution: The accuracy of discriminating the specific state of the temperature sensor is improved.

[0018] In an example of the present invention, determining that the temperature sensor corresponding to the second temperature value is abnormal includes: if ΔT3 > V2, ΔT4 > V2, and ΔT5 > V2, cancel the abnormal determination of the first sensor, the second sensor, and the third sensor; correct the preset deviation value.

[0019] Compared with the prior art, the technical effect achieved by adopting this technical solution: Specifically, considering extreme cases, the ambient temperature may change greatly before and after the compressor runs. If all temperature sensors are determined to be abnormal, then cancel this fault determination to reduce the risk of misjudgment; in addition, improve the accuracy of discriminating the temperature sensor by correcting the preset deviation value.

[0020] In an example of the present invention, the corrected preset deviation value satisfies the following formula 2; Formula 2: V4 = V2 + V3; where V4 is the preset deviation correction value obtained after correcting the preset deviation value, V3 is the correction parameter, and 1°C ≤ V3 ≤ 5°C.

[0021] Compared with the prior art, the technical effect achieved by adopting this technical solution: By correcting the preset deviation value, the accuracy of discriminating the temperature sensor is improved.

[0022] On the other hand, the present invention also provides a detection device for an air conditioner, where the air conditioner includes a plurality of temperature sensors; the detection device includes: a first judgment module, which is used to judge whether the first temperature difference value between a plurality of first temperature values collected by the plurality of temperature sensors meets the steady-state condition after the air conditioner is powered on; an acquisition module, which is used to obtain a first temperature reference value according to the plurality of first temperature values, and obtain a plurality of second temperature values collected by the plurality of temperature sensors after the compressor shutdown duration of the air conditioner meets a first preset time; a second judgment module, which is used to judge that the temperature sensor corresponding to the second temperature value is abnormal when there is at least one of the plurality of second temperature values whose temperature difference value from the first temperature reference value meets the abnormal temperature difference condition.

[0023] Compared with the prior art, the technical effects achieved by adopting this technical solution: It can achieve the corresponding technical effects in any of the above technical solutions, which will not be elaborated here.

[0024] On yet another aspect, the present invention also provides an air conditioner, including a controller, and the controller is used to execute an executable program to implement the detection method in any of the above.

[0025] Compared with the prior art, the technical effects achieved by adopting this technical solution: It can achieve the corresponding technical effects in any of the above technical solutions of the detection method, which will not be elaborated here.

[0026] After adopting the technical solution of the present invention, the following technical effects can be achieved:

[0027] (1) By detecting a plurality of first temperature values collected by the temperature sensors at the moment when the air conditioner is powered on, so that after they meet the steady-state condition, subsequent abnormal discrimination is carried out, which improves the accuracy of subsequent abnormal detection judgment and avoids carrying out under the condition that there is a large temperature deviation between the plurality of first temperature values, resulting in a decrease in the accuracy of subsequent abnormal detection; in addition, by collecting a plurality of second temperature values through the plurality of temperature sensors after the compressor stops, the self-construction principle of the temperature sensors is fully utilized, that is, making them experience temperature changes before abnormal detection, which can better reflect the stability of the temperature sensors themselves and highlight whether there are abnormalities in the internal resistance after experiencing temperature changes. Specifically, it is manifested by associating the plurality of second temperature values with the first temperature reference value, further improving the accuracy of abnormal discrimination of the temperature sensors, so that the air conditioner can make a response signal in a timely manner according to the abnormal state in the discrimination result;

[0028] (2) By collecting temperature values in the stage from when the compressor starts to run until it stops, it effectively replaces the non-steady-state condition at the moment when the air conditioner is powered on, improving the applicability and generality of the detection method, and further improving the reliability of the detection method. Description of the Drawings

[0029] Figure 1 It is a schematic flowchart of a detection method for an air conditioner provided by an embodiment of the present invention.

[0030] Figure 2 It is a schematic diagram of module connections of a detection device for an air conditioner provided by an embodiment of the present invention.

[0031] Explanation of reference numerals:

[0032] 100 - Detection device; 110 - First judgment module; 120 - Acquisition module; 130 - Second judgment module. Detailed implementation manners

[0033] To make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0034] See Figure 1 , which is a schematic flowchart of a detection method for an air conditioner provided by an embodiment of the present invention. The air conditioner includes, for example, a plurality of temperature sensors. Specifically, the detection method includes, for example:

[0035] Step S1: After the air conditioner is powered on, determine whether the first temperature difference value between a plurality of first temperature values collected by a plurality of temperature sensors meets the steady - state condition;

[0036] Step S21: If yes, obtain a first temperature reference value according to the plurality of first temperature values;

[0037] Step S3: After the compressor shutdown duration of the air conditioner meets a first preset time, collect a plurality of second temperature values by a plurality of temperature sensors; where the first preset time is denoted as T1.

[0038] Step S4: If the temperature difference value between at least one of the plurality of second temperature values and the first temperature reference value meets the abnormal temperature difference condition, determine that the temperature sensor corresponding to this second temperature value is abnormal.

[0039] Specifically, during the operation of the air conditioner, it has a high dependence on the accuracy of temperature detection, and the actual operation efficiency is also importantly related to the detected temperature.

[0040] In a specific example, if the temperature sensor is abnormal and does not meet the fault conditions, it can still provide temperature parameters for the air conditioner during the operation of the air conditioner. Then, the air conditioner performs corresponding operation actions according to the temperature parameters. For ease of understanding, for example, the air conditioner can be made to maintain a cooling operation. Then, since the temperature sensor is in an abnormal state, there is a deviation between the collected temperature parameter and the actual temperature. Specifically, when the temperature parameter is the indoor ambient temperature, the collected indoor ambient temperature is lower than the actual indoor ambient temperature. Then, it results in low heat exchange efficiency between the air conditioner and the indoor environment, that is, the actual cooling efficiency is lower than the required cooling efficiency set by the user, causing the operating frequency of the air conditioner to be too low and affecting comfort.

[0041] For example, multiple temperature sensors can be used to collect the temperature of outdoor objects and / or outdoor objects. Specifically, the outdoor objects can be represented as the outdoor environment, the outdoor coil, and the compressor. Correspondingly, the multiple first temperature values can actually include the first outdoor ambient temperature value collected for the outdoor environment, the first outdoor coil temperature value collected for the outdoor coil, and the exhaust temperature value collected for the exhaust pipe of the compressor. When the air conditioner is in standby or at the power-on moment, since the air conditioner has not gone through the operating state, the temperature difference between the multiple first temperature values collected by the multiple temperature sensors is within the preset deviation range.

[0042] It should be noted that due to the different product specifications of the multiple temperature sensors or the different specific parts where the multiple temperature sensors are installed on the air conditioner, there will be a certain temperature deviation between the multiple first temperature values finally collected.

[0043] Therefore, by detecting the multiple first temperature values collected by the temperature sensor at the power-on moment of the air conditioner, after making them meet the steady-state conditions, and then performing subsequent abnormal discrimination, the accuracy of the subsequent abnormal detection is improved, avoiding performing it when there is a large temperature deviation between the multiple first temperature values, which may reduce the accuracy of the subsequent abnormal detection. In addition, by collecting multiple second temperature values through the multiple temperature sensors after the compressor stops, the self-construction principle of the temperature sensor is fully utilized, that is, making it experience temperature changes before performing abnormal detection, which can better reflect the stability of the temperature sensor itself and highlight whether there is an abnormality in the internal resistance after experiencing temperature changes. Specifically, it is manifested by associating the multiple second temperature values with the first temperature reference value, further improving the accuracy of abnormal discrimination of the temperature sensor. Thus, the air conditioner can make a response signal in a timely manner according to the abnormal state in the discrimination result. The response signal can be, for example, the flashing of a fault alarm light or the ringing of a fault alarm.

[0044] Furthermore, once the temperature sensor detects abnormal temperature but does not meet the temperature sensor failure condition, it will lead to problems such as abnormal control system of the air conditioner, premature protection or protection failure.

[0045] Preferably, the multiple temperature sensors include a first sensor, a second sensor and a third sensor; determining whether a first temperature difference value between multiple first temperature values collected by the multiple temperature sensors meets a steady-state condition includes:

[0046] If ΔT1≤V1 and ΔT2≤V1, it is determined that the first temperature difference value between the multiple first temperature values meets the steady-state condition; where Ta1 is the first outdoor ambient temperature value obtained by the first sensor, Td1 is the first exhaust gas temperature value obtained by the second sensor, Te1 is the first external coil temperature value obtained by the third sensor, V1 is a preset value, and 1°C≤V1≤5°C, ΔT1 = |Ta1 - Td1|, ΔT2 = |Ta1 - Te1|.

[0047] Specifically, since the first sensor, the second sensor and the third sensor are all set in the outdoor environment, when the air conditioner is in standby or at the power-on moment, and when the three are in normal states, the temperature values collected by the three should be similar values. Therefore, by setting ΔT1 and ΔT2 to be compared with V1 respectively, it is convenient to accurately determine that the three are all in a stable state, that is, when ΔT1≤V1 and ΔT2≤V1, it can be determined that the first sensor, the second sensor and the third sensor all meet the stable conditions at this time. For example, V1 can take a value of 3°C.

[0048] It should be noted that although theoretically there is a situation where both detected ΔT1 and ΔT2 are less than V1, and the collected Ta1, Td1 and Te1 all deviate greatly from the actual temperature values, and in subsequent abnormal judgments, they do not meet the abnormal temperature difference conditions, in this case, it is also determined to be in a normal state.

[0049] Preferably, the multiple temperature sensors include a first sensor, a second sensor and a third sensor; determining whether a first temperature difference value between multiple first temperature values collected by the multiple temperature sensors meets a steady-state condition includes:

[0050] If ΔT1>V1 or ΔT2>V1, after the shutdown duration of the air conditioner meets a second preset time, it is determined whether a third temperature difference value between multiple third temperature values collected by the multiple temperature sensors meets the steady-state condition;

[0051] If so, a second temperature reference value is obtained according to the multiple third temperature values;

[0052] If there is at least one of the multiple second temperature values whose temperature difference from the second temperature reference value satisfies the abnormal temperature difference condition, it is determined that the temperature sensor corresponding to this second temperature value is abnormal; where Ta1 is the first outdoor ambient temperature value obtained by the first sensor, Td1 is the first exhaust gas temperature value obtained by the second sensor, and Te1 is the first external coil temperature value obtained by the third sensor; ΔT1 = |Ta1 - Td1|, ΔT2 = |Ta1 - Te1|, V1 is a preset value, and 1°C ≤ V1 ≤ 5°C.

[0053] In a specific example, the steady-state judgment of the multiple third temperature values collected by multiple temperature sensors is performed before the abnormal state. The specific value-taking principle of the second temperature reference value is the same as that of the first temperature reference value. Specifically, whether it is the second temperature reference value or the first temperature reference value, it is the average value obtained by taking the average of the multiple temperature values that satisfy the steady-state condition after the temperature difference values between the multiple temperature values collected by the multiple temperature sensors satisfy the steady-state condition. Therefore, the second temperature reference value can be specifically taken as the average value of the multiple third temperature values. Among them, the average values taken are all divided for the sampling objects in the outdoor environment or the indoor environment of the air conditioner. For example, the exhaust gas temperature value, the exhaust gas temperature value, and the outdoor ambient temperature value collected in the outdoor environment.

[0054] Furthermore, when the situation of ΔT1 > V1 or ΔT2 > V1 occurs, it is determined that the steady-state condition is not satisfied at this time, and the temperature values are collected during the stage from the compressor's self-operation to shutdown to effectively replace the situation where the steady-state condition is not satisfied at the moment when the air conditioner is powered on, so as to improve the applicability and generality of the detection method, and further improve the reliability of the detection method.

[0055] Correspondingly, when the sampling object is in the indoor environment, the detection principle is the same as that mentioned for the outdoor environment above, and it will not be elaborated here.

[0056] Preferably, the first temperature reference value satisfies the following formula 1;

[0057] Formula 1: Tbase = (Ta1 + Td1 + Te1) / 3; where Tbase is the first temperature reference value.

[0058] Preferably, determining that the first temperature difference value between multiple first temperature values satisfies the steady-state condition includes: marking a steady-state detection flag bit for multiple temperature sensors.

[0059] Preferably, the multiple second temperature values include a second outdoor ambient temperature value, a second exhaust gas temperature value, and a second external coil temperature value; if there is at least one of the multiple second temperature values whose temperature difference from the first temperature reference value satisfies the abnormal temperature difference condition, determining that the temperature sensor corresponding to this second temperature value is abnormal includes:

[0060] If ΔT3 > V2, then it is determined that the first sensor is abnormal; ΔT3 = |Tbase - Ta2|;

[0061] And / or, if ΔT4 > V2, then it is determined that the second sensor is abnormal; ΔT4 = |Tbase - Td2|;

[0062] And / or, if ΔT5 > V2, then it is determined that the third sensor is abnormal; ΔT5 = |Tbase - Te2|; where Ta2 is the second outdoor ambient temperature value, Td2 is the second exhaust gas temperature value, Te2 is the second external coil temperature value, Tbase is the first temperature reference value, and V2 is a preset deviation value, 5°C ≤ V2 ≤ 10°C.

[0063] Preferably, determining that the temperature sensor corresponding to the second temperature value is abnormal includes:

[0064] If ΔT3 > V2, ΔT4 > V2, and ΔT5 > V2, then cancel the abnormal determination of the first sensor, the second sensor, and the third sensor;

[0065] Correct the preset deviation value.

[0066] Preferably, the corrected preset deviation value satisfies the following formula 2;

[0067] Formula 2: V4 = V2 + V3; where V4 is the preset deviation correction value obtained after correcting the preset deviation value, V3 is a correction parameter, and 1°C ≤ V3 ≤ 5°C.

[0068] On the other hand, referring to Figure 2 , which is a schematic diagram of the module connection of a detection device 100 for an air conditioner provided by an embodiment of the present invention. The detection device 100 includes, for example, a first determination module 110, an acquisition module 120, and a second determination module 130. The first determination module 110 is configured to determine whether a first temperature difference value between a plurality of first temperature values collected by a plurality of temperature sensors satisfies a steady state condition after the air conditioner is powered on; the acquisition module 120 is configured to obtain a first temperature reference value according to the plurality of first temperature values, and obtain a plurality of second temperature values collected by the plurality of temperature sensors after the compressor shutdown duration of the air conditioner satisfies a first preset time; the second determination module 130 is configured to determine that the temperature sensor corresponding to the second temperature value is abnormal when there is at least one temperature difference value between the plurality of second temperature values and the first temperature reference value that satisfies an abnormal temperature difference condition.

[0069] On yet another aspect, an embodiment of the present invention further provides an air conditioner. Specifically, the air conditioner includes, for example, a controller, and the controller is configured to execute an executable program to implement the detection method of any one of the above. Further, this embodiment can achieve the corresponding technical effects in the technical solutions of any one of the above detection methods, which will not be elaborated here.

[0070] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A detection method for an air conditioner, the air conditioner including a plurality of temperature sensors; characterized in that, The detection method includes: After the air conditioner is powered on, determining whether a first temperature difference value between a plurality of first temperature values collected by the plurality of temperature sensors meets a steady-state condition; If so, obtaining a first temperature reference value according to the plurality of first temperature values; After the compressor shutdown duration of the air conditioner meets a first preset time, collecting a plurality of second temperature values by the plurality of temperature sensors; If the temperature difference value between at least one of the plurality of second temperature values and the first temperature reference value meets an abnormal temperature difference condition, determining that the temperature sensor corresponding to the second temperature value is abnormal.

2. The detection method according to claim 1, wherein The plurality of temperature sensors include a first sensor, a second sensor, and a third sensor; Determining whether the first temperature difference value between the plurality of first temperature values collected by the plurality of temperature sensors meets the steady-state condition includes: If ΔT1≤V1 and ΔT2≤V1, determining that the first temperature difference value between the plurality of first temperature values meets the steady-state condition; Wherein, Ta1 is the first outdoor ambient temperature value obtained by the first sensor, Td1 is the first exhaust gas temperature value obtained by the second sensor, Te1 is the first external coil temperature value obtained by the third sensor, V1 is a preset value, and 1°C≤V1≤5°C, ΔT1 = |Ta1 - Td1|, ΔT2 = |Ta1 - Te1|.

3. The detection method according to claim 1, wherein The plurality of temperature sensors include a first sensor, a second sensor, and a third sensor; determining whether the first temperature difference value between the plurality of first temperature values collected by the plurality of temperature sensors meets the steady-state condition includes: If ΔT1>V1 or ΔT2>V1, after the shutdown duration of the air conditioner meets a second preset time, obtaining whether the third temperature difference value between the plurality of third temperature values collected by the plurality of temperature sensors meets the steady-state condition; If so, obtaining a second temperature reference value according to the plurality of third temperature values; If the temperature difference value between at least one of the plurality of second temperature values and the second temperature reference value meets the abnormal temperature difference condition, determining that the temperature sensor corresponding to the second temperature value is abnormal; Wherein, Ta1 is the first outdoor ambient temperature value obtained by the first sensor, Td1 is the first exhaust gas temperature value obtained by the second sensor, Te1 is the first external coil temperature value obtained by the third sensor; ΔT1 = |Ta1 - Td1|, ΔT2 = |Ta1 - Te1|, V1 is a preset value, and 1°C≤V1≤5°C.

4. The detection method according to claim 2, wherein The first temperature reference value satisfies the following formula 1; Formula 1: Tbase = (Ta1 + Td1 + Te1) / 3; Wherein, Tbase is the first temperature reference value.

5. The detection method according to claim 2, wherein Determining that the first temperature difference value between the plurality of first temperature values meets the steady-state condition includes: Marking a steady-state detection flag bit for the plurality of temperature sensors.

6. The detection method according to any one of claims 2-5, characterized in that, The multiple second temperature values include a second outdoor ambient temperature value, a second exhaust gas temperature value, and a second external coil temperature value; the determination that the temperature sensor corresponding to the second temperature value is abnormal if at least one of the multiple second temperature values has a temperature difference value from the first temperature reference value that satisfies an abnormal temperature difference condition includes: If ΔT3 > V2, determine that the first sensor is abnormal; ΔT3 = |Tbase - Ta2|; And / or, if ΔT4 > V2, determine that the second sensor is abnormal; ΔT4 = |Tbase - Td2|; And / or, if ΔT5 > V2, determine that the third sensor is abnormal; ΔT5 = |Tbase - Te2|; Wherein, Ta2 is the second outdoor ambient temperature value, Td2 is the second exhaust gas temperature value, Te2 is the second external coil temperature value, Tbase is the first temperature reference value, and V2 is a preset deviation value, 5°C ≤ V2 ≤ 10°C.

7. The detection method according to claim 6, characterized in that, The determination that the temperature sensor corresponding to the second temperature value is abnormal includes: If ΔT3 > V2, ΔT4 > V2, and ΔT5 > V2, cancel the abnormal determination of the first sensor, the second sensor, and the third sensor; Correct the preset deviation value.

8. The detection method according to claim 7, wherein: Correcting the preset deviation value satisfies the following formula 2; Formula 2: V4 = V2 + V3; Wherein, V4 is the preset deviation correction value obtained after correcting the preset deviation value, V3 is a correction parameter, and 1°C ≤ V3 ≤ 5°C.

9. A detection device for an air conditioner, the air conditioner including a plurality of temperature sensors; characterized in that, The detection device includes: A first determination module (110), the first determination module (110) is configured to determine whether a first temperature difference value between multiple first temperature values collected by the multiple temperature sensors satisfies a steady state condition after the air conditioner is powered on; An acquisition module (120), the acquisition module (120) is configured to obtain a first temperature reference value according to the multiple first temperature values, and obtain multiple second temperature values collected by the multiple temperature sensors after the compressor shutdown duration of the air conditioner satisfies a first preset time; A second determination module (130), the second determination module (130) is configured to determine that the temperature sensor corresponding to the second temperature value is abnormal when at least one of the multiple second temperature values has a temperature difference value from the first temperature reference value that satisfies an abnormal temperature difference condition.

10. An air conditioner, characterized in that, It includes a controller, and the controller is configured to execute an executable program to implement the detection method according to any one of claims 1-8.

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