Anomaly detection system and air conditioner

Abstract

To provide an abnormality detection system that can detect an abnormality of a plurality of temperature sensors provided in an air conditioner, and the air conditioner.SOLUTION: An abnormality detection system detects an abnormality of an air conditioner comprising a plurality of temperature sensors, and comprises a temperature acquisition unit for acquiring a plurality of measured temperatures measured by the plurality of temperature sensors, a determination unit for performing determination processing for determining whether the air conditioner is normal or not on the basis of the plurality of measured temperatures acquired by the temperature acquisition unit, and an output unit for outputting a determination result of the determination unit. The determination unit performs temperature determination processing for determining whether each of the plurality of temperature sensors is normal or not on the basis of the plurality of measured temperatures in a stopped state of air conditioning operation of the air conditioner.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an abnormality detection system and an air conditioner. [Background technology]

[0002] Patent Document 1 discloses an air conditioner that detects a temperature thermistor (temperature sensor) that has a faulty installation in an air conditioner that includes multiple outdoor units. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5516295 Summary of the Invention [Problem to be solved by the invention]

[0004] When an abnormality occurs in the temperature sensor, the measured temperature may be abnormal. Therefore, when the temperature measured by the temperature sensor is abnormal, it is difficult to determine whether the cause is an abnormality in the temperature sensor itself or an abnormality in the measurement location of the temperature sensor.

[0005] Therefore, an object of one aspect of the present invention is to provide an anomaly detection system that detects anomalies in a plurality of temperature sensors provided in an air conditioner, and an air conditioner. [Means for solving the problem]

[0006] An anomaly detection system according to one aspect of the present invention is an anomaly detection system for detecting an anomaly in an air conditioner having a plurality of temperature sensors, comprising: a temperature acquisition unit that acquires a plurality of measured temperatures measured by the plurality of temperature sensors, a determination unit that performs a determination process for determining whether or not the air conditioner is normal based on the plurality of measured temperatures acquired by the temperature acquisition unit, and an output unit that outputs a determination result of the determination unit. The determination unit performs a temperature determination process for determining whether or not each of the plurality of temperature sensors is normal based on the plurality of measured temperatures when the air conditioning operation of the air conditioner is stopped.

[0007] An air conditioner according to one aspect of the present invention includes the abnormality detection system and an air conditioning control unit that controls air conditioning operation. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram of an anomaly detection system and an air conditioner according to an embodiment. [Diagram 2] FIG. 2 is a flowchart for explaining the operation of the temperature determination process of the anomaly detection system shown in FIG. [Diagram 3] FIG. 3 is a flowchart for explaining the operation of the cycle determination process that is carried out when the air conditioner stops due to an error during cooling operation and it is determined that all the temperature sensors are normal. [Figure 4] FIG. 4 is a flowchart for explaining the operation of the cycle determination process that is carried out when the air conditioner stops due to an error during heating operation and it is determined that all the temperature sensors are normal. [Diagram 5] FIG. 5 is a block diagram of an air conditioner according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The embodiment and modified examples described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiment and modified examples. Various modifications other than the embodiment and modified examples are possible according to the design, etc., as long as they do not deviate from the technical idea of ​​the present disclosure.

[0010] (Embodiment) An anomaly detection system 10 and an air conditioner 20 according to the present embodiment will be described below with reference to FIG.

[0011] The anomaly detection system 10 is configured to detect whether or not a plurality of temperature sensors provided in an air conditioner 20 has an anomaly.

[0012] The air conditioner 20 includes an air conditioning control unit 21, a communication unit 22, an indoor heat exchanger 23, a four-way valve 24, an outdoor heat exchanger 25, an expansion valve 26, a compressor 27, and a plurality of temperature sensors (first temperature sensors 281-285, second temperature sensors 291-295), and is configured to perform air conditioning operation. The air conditioning operation includes a cooling operation and a heating operation.

[0013] A cycle mechanism 200 that circulates the refrigerant is configured by the indoor heat exchanger 23, the four-way valve 24, the outdoor heat exchanger 25, the expansion valve 26, and the compressor 27. In this cycle mechanism 200, the direction in which the refrigerant circulates is reversed during cooling operation and heating operation.

[0014] The air conditioner 20 includes an indoor unit 201 and an outdoor unit 202 .

[0015] Of the components of the cycle mechanism 200, the indoor heat exchanger 23 is provided in the indoor unit 201. Of the components of the cycle mechanism 200, the four-way valve 24, the outdoor heat exchanger 25, the expansion valve 26, and the compressor 27 are provided in the outdoor unit 202.

[0016] The air conditioning control unit 21 controls the air conditioning operation. Specifically, the air conditioning control unit 21 controls the cycle mechanism 200, the fan provided in the indoor unit 201, and the like to perform air conditioning.

[0017] The communication unit 22 is a communication interface, and is connected to the communication line NT via a router, a gateway, etc. The communication unit 22 is capable of communicating with a communication unit 31 of the server 30 via the communication line NT.

[0018] The multiple temperature sensors include multiple first temperature sensors 281, 282, 283, 284, 285 provided in the indoor unit 201, and multiple second temperature sensors 291, 292, 293, 294, 295 provided in the outdoor unit 202. As the multiple temperature sensors, for example, thermistors can be used.

[0019] The first temperature sensors 281 to 285 measure, for example, the temperatures of the air drawn in from the intake port of the indoor unit 201 (room temperature), the air blown out from the outlet, the refrigerant before and after passing through the indoor heat exchanger 23, and the drive motor of the indoor fan, respectively.

[0020] The second temperature sensors 291 to 295 measure, for example, the outside air temperature, the refrigerant passing through the outdoor heat exchanger 25, the refrigerant passing through the expansion valve 26, and the temperatures of the refrigerant on the suction side (suction temperature) and discharge side (discharge temperature; hereinafter also simply referred to as the "discharge temperature") of the compressor 27, respectively.

[0021] During air conditioning operation, the air conditioning control unit 21 acquires the measured temperatures of the multiple temperature sensors (first temperature sensors 281-285, second temperature sensors 291-295) at a predetermined cycle (for example, 1 minute, 5 minutes, 10 minutes, etc.) and judges whether there is any abnormality in the measured temperatures. In order to judge whether there is any abnormality in the measured temperatures, the air conditioning control unit 21 compares the acquired measured temperatures of each temperature sensor with a predetermined temperature threshold value corresponding to each temperature sensor. If even one of the multiple measured temperatures of the multiple temperature sensors exceeds the corresponding temperature threshold value, the air conditioning control unit 21 judges that there is some abnormality in the cycle mechanism 200 and stops the air conditioning operation due to an error. The judgment of whether there is any abnormality in the measured temperatures is not limited to this, and it may be possible to compare the measured temperatures of the multiple temperature sensors and judge that there is some abnormality in the cycle mechanism 200 if the normal state and the sensor measured temperatures are reversed or the difference is outside the threshold value.

[0022] When the air conditioning operation is stopped due to an error, the air conditioning control unit 21 transmits the measured temperatures of each temperature sensor to the anomaly detection system 10 via the communication unit 22, the communication line NT, and the communication unit 31. Specifically, the air conditioning control unit 21 transmits the measured temperatures of each temperature sensor a predetermined time after the error stop to the anomaly detection system 10. The predetermined time is preferably longer than the time it takes for the temperature of each temperature sensor to change to a steady temperature, and is, for example, 15 minutes, 30 minutes, 1 hour, etc.

[0023] The abnormality detection system 10 includes a temperature acquisition unit 11, a determination unit 12, and an output unit 13. The abnormality detection system 10 is configured to perform a temperature determination process for determining whether or not each of a plurality of temperature sensors (first temperature sensors 281-285, second temperature sensors 291-295) is normal.

[0024] The temperature acquisition unit 11 includes a first temperature acquisition unit 111 and a second temperature acquisition unit 112. The first temperature acquisition unit 111 acquires temperatures measured by the multiple first temperature sensors 281-285 (multiple first measured temperatures). The second temperature acquisition unit 112 acquires temperatures measured by the multiple second temperature sensors 291-295 (multiple second measured temperatures).

[0025] The anomaly detection system 10 performs a temperature determination process as follows. In the temperature determination process, a determination as to whether each of the first temperature sensors 281-285 is normal or not and a determination as to whether each of the second temperature sensors 291-295 is normal or not are performed separately.

[0026] The judgment unit 12 calculates an average value of the multiple first measurement temperatures acquired by the first temperature acquisition unit 111 as a representative value (first representative value Trp1) of the multiple first measurement temperatures. Then, the judgment unit 12 compares each of the multiple first measurement temperatures with the first representative value Trp1. Specifically, the judgment unit 12 calculates a difference between each of the multiple first measurement temperatures and the first representative value Trp1. If the absolute values ​​of each of the multiple differences are all less than a predetermined temperature threshold value Tth (for example, 3°C), the judgment unit 12 judges that all of the multiple first temperature sensors 281 to 285 are normal. If there is a difference whose absolute value is equal to or greater than the temperature threshold value Tth among the multiple differences, the judgment unit 12 judges that the first temperature sensor corresponding to that difference is abnormal, and judges that the other first temperature sensors are normal. In this way, the judgment unit 12 identifies the first temperature sensor that is abnormal among the multiple first temperature sensors.

[0027] As a specific example, when the temperatures measured by the multiple first temperature sensors 281-285 are as shown in Table 1 below, the first representative value Trp1 is 26.6°C. As described above, when the temperature threshold value Tth is set to 3°C, the absolute value of the difference between the temperature measured by the first temperature sensor 285, 30°C, and the first representative value Trp1 is 3.4°C, which is greater than or equal to the temperature threshold value Tth. Therefore, the judgment unit 12 judges that the first temperature sensor 285 is abnormal, and judges that the other first temperature sensors 281-284 are normal.

[0028] [Table 1]

[0029] The judgment unit 12 calculates an average value of the second measurement temperatures acquired by the second temperature acquisition unit 112 as a representative value (second representative value Trp2) of the second measurement temperatures. Then, the judgment unit 12 compares each of the second measurement temperatures with the second representative value Trp2. Specifically, the judgment unit 12 calculates the difference between each of the second measurement temperatures and the second representative value Trp2. If the absolute values ​​of the differences are all less than the temperature threshold value Tth, the judgment unit 12 judges that all of the second temperature sensors 291 to 295 are normal. If there is a difference whose absolute value is equal to or greater than the temperature threshold value Tth among the differences, the judgment unit 12 judges that the second temperature sensor corresponding to that difference is abnormal, and judges that the other second temperature sensors are normal. In this way, the judgment unit 12 identifies the second temperature sensor that is abnormal among the multiple second temperature sensors.

[0030] As a specific example, when the temperatures measured by the second temperature sensors 291-295 are as shown in Table 2 below, the second representative value Trp2 is 31.8°C. As described above, when the temperature threshold value Tth is set to 3°C, the absolute value of the difference between the temperature measured by the second temperature sensor 294, 35°C, and the second representative value Trp2 is 3.2°C, which is greater than or equal to the temperature threshold value Tth. Therefore, the determination unit 12 determines that the second temperature sensor 294 is abnormal, and determines that the other second temperature sensors 291-293, 295 are normal.

[0031] [Table 2]

[0032] In the above, as an example, a case where each of the multiple first temperature sensors 281-285 and the multiple second temperature sensors 291-295 includes one abnormal temperature sensor has been described, but this is not limited to the above. There may also be a case where only one of the multiple first temperature sensors 281-285 and the multiple second temperature sensors 291-295 includes an abnormal temperature sensor, or a case where the multiple first temperature sensors 281-285 include two or more abnormal temperature sensors. Of course, there may also be a case where all of the multiple first temperature sensors 281-285 and the multiple second temperature sensors 291-295 are normal.

[0033] Next, the operation of the temperature determination process of the anomaly detection system 10 will be described with reference to the flowchart shown in Fig. 2. Here, the operation of the anomaly detection system 10 to determine whether or not there is an abnormality in the multiple first temperature sensors 281-285 will be described.

[0034] First, the first temperature acquisition unit 111 acquires the measured temperatures (plurality of first measured temperatures) of the plurality of first temperature sensors 281 to 285 provided in the indoor unit 201 (S1).

[0035] The judgment section 12 calculates a first representative value Trp1 from the plurality of first measured temperatures (S2).

[0036] The judgment section 12 calculates the difference between each of the multiple first measured temperatures and the first representative value Trp1 (S3).

[0037] The determination unit 12 performs a process of determining whether or not all of the absolute values ​​of the differences are less than the temperature threshold value Tth (S4).

[0038] If all of the absolute values ​​of the differences are less than the temperature threshold value Tth (S4: YES), the determination unit 12 determines that all of the first temperature sensors are normal (S5).

[0039] If all the absolute values ​​of the differences are not less than the temperature threshold value Tth (S4: NO), the determination unit 12 identifies the first temperature sensor that is abnormal (S6).

[0040] The operation of the temperature determination process by the anomaly detection system 10 to determine whether or not there is an abnormality in the multiple second temperature sensors 291-295 is similar to the above-mentioned operation to determine whether or not there is an abnormality in the multiple first temperature sensors 281-285, so a description thereof will be omitted.

[0041] In the temperature judgment process, when the judgment unit 12 identifies an abnormal temperature sensor, the output unit 13 outputs a judgment result including identification information for identifying the abnormal temperature sensor to the communication unit 22 of the air conditioner 20 via the communication unit 31 and the communication line NT. The air conditioner 20 outputs the received judgment result to, for example, a terminal of a repair technician. This allows the repair technician to know in advance that the cause of the error stop of the air conditioning operation is an abnormality in the temperature sensor, and therefore the work of identifying the abnormal part can be omitted, thereby shortening the repair work time.

[0042] On the other hand, in the temperature judgment process, if the judgment unit 12 judges that all of the multiple temperature sensors (first temperature sensors 281-285, second temperature sensors 291-295) are normal, the output unit 13 outputs a judgment result indicating that all of the temperature sensors are normal to the air conditioner 20. Specifically, the output unit 13 outputs the judgment result indicating that all of the temperature sensors are normal to the communication unit 22 of the air conditioner 20 via the communication unit 31 and the communication line NT. The air conditioner 20 outputs the received judgment result to, for example, a terminal of a repair company.

[0043] In this way, according to this embodiment, when the air conditioning control unit 21 stops the air conditioning operation due to an error, it is possible to determine whether the error stop is caused by an abnormality in the temperature sensor. Furthermore, if the error stop is caused by an abnormality in the temperature sensor, it is possible to identify the abnormal temperature sensor.

[0044] Furthermore, in the anomaly detection system 10 of this embodiment, when the determining unit 12 determines that all of the multiple temperature sensors are normal, the anomaly detection system 10 performs a cycle determination process to determine where in the cycle mechanism 200 an anomaly exists.

[0045] Specifically, if the judgment unit 12 judges that all of the multiple temperature sensors are normal, the anomaly detection system 10 causes the air conditioning control unit 21 to perform reverse cycle operation. Reverse cycle operation refers to air conditioning operation in which the refrigerant cycle direction is reversed from the air conditioning operation performed immediately before the error stop. For example, if the air conditioning operation performed immediately before the error stop was cooling operation, the reverse cycle operation will be heating operation. If the judgment unit 12 judges that all of the multiple temperature sensors are normal, the output unit 13 outputs an instruction to perform reverse cycle operation to the communication unit 22 of the air conditioner 20 via the communication unit 31 and the communication line NT.

[0046] When the air conditioner 20 receives an instruction to perform reverse cycle operation, the air conditioning control unit 21 executes the reverse cycle operation.

[0047] The air conditioning control unit 21 acquires the measured temperatures of each of the multiple temperature sensors (first temperature sensors 281-285, second temperature sensors 291-295) a predetermined time after the start of reverse cycle operation. The air conditioning control unit 21 transmits each of the acquired measured temperatures to the anomaly detection system 10 via the communication unit 22, the communication line NT, and the communication unit 31. The predetermined time is preferably longer than the time it takes for the cycle state of the reverse cycle operation to stabilize, and is, for example, 5 minutes, 10 minutes, 15 minutes, etc.

[0048] The determination unit 12 of the anomaly detection system 10 determines where the anomaly exists in the cycle mechanism 200 based on each measured temperature.

[0049] Specifically, when the reverse cycle operation is the heating operation, the determination unit 12 determines where in the cycle mechanism 200 there is an abnormality by determining, for example, whether or not the following expressions 1 and 2 are satisfied. Discharge temperature > Indoor heat exchanger temperature > Indoor temperature +5 (1) Outdoor temperature>Outdoor heat exchanger temperature...(2)

[0050] Furthermore, when the reverse cycle operation is a cooling operation, the determination unit 12 determines where in the cycle mechanism 200 there is an abnormality by determining, for example, whether or not the following expressions 3 and 4 are satisfied. Discharge temperature>Outdoor heat exchanger temperature>Outdoor temperature...(3) Indoor temperature>Indoor heat exchanger temperature+5...(4)

[0051] Next, the operation of the cycle determination process of the anomaly detection system 10 will be described with reference to the flowcharts shown in Fig. 3 and Fig. 4. Fig. 3 is a flowchart showing the operation when the air conditioning operation immediately before the error stop was cooling operation and the reverse cycle operation was heating operation. Fig. 4 is a flowchart showing the operation when the air conditioning operation immediately before the error stop was heating operation and the reverse cycle operation was cooling operation. First, with reference to Fig. 3, the operation of the anomaly detection system 10 when the reverse cycle operation is heating operation will be described.

[0052] When the air conditioning control unit 21 stops the air conditioning operation due to an error during cooling operation, the abnormality detection system 10 executes a temperature judgment process, and the judgment unit 12 judges that all of the multiple temperature sensors are normal (Figure 2: S5), the abnormality detection system 10 causes the air conditioning control unit 21 to start heating operation (S11).

[0053] The abnormality detection system 10 waits until a predetermined time has elapsed during which the cycle state of the heating operation becomes stable (S12).

[0054] The temperature acquisition unit 11 acquires the measured temperatures (plurality of measured temperatures) of the plurality of temperature sensors (first temperature sensors 281-285, second temperature sensors 291-295) provided in the air conditioner 20 (S13).

[0055] The judgment unit 12 performs a judgment process to determine whether or not the above formula 1 is satisfied using the discharge temperature (the temperature of the air outlet of the indoor unit 201), the indoor heat exchanger temperature, and the indoor temperature (the temperature of the air inlet of the indoor unit 201) from the multiple measured temperatures acquired (S14).

[0056] If the above formula 1 is satisfied (S14: YES), the judgment unit 12 performs a judgment process to determine whether the above formula 2 is satisfied using the outdoor temperature (outdoor air temperature) and the outdoor heat exchanger temperature from among the multiple acquired measured temperatures (S15).

[0057] When the above formula 2 is satisfied (S15: YES), the determination unit 12 determines that the four-way valve 24 in the cycle mechanism 200 is abnormal (S16).

[0058] If the above formula 1 is not satisfied (S14: NO), the determination unit 12 determines that there is an abnormality in the compressor 27 or the like of the cycle mechanism 200 (S17). Specifically, the determination unit 12 determines that there is an abnormality in the compressor 27, an abnormality in the expansion valve 26, or an abnormality in the refrigerant such as a refrigerant shortage due to a refrigerant leak.

[0059] If the above formula 2 does not hold (S15: NO), similarly to when the above formula 1 does not hold (S14: NO), the judgment unit 12 judges that there is an abnormality in the compressor 27 or the like of the cycle mechanism 200 (S17).

[0060] The process of determining whether the above formula 1 is satisfied (S14) and the process of determining whether the above formula 2 is satisfied (S15) may be performed simultaneously, or the order of the processes may be reversed. In addition, when only one of the above formula 1 or formula 2 is satisfied (only one of S14 and S15 is YES), the compressor 27 may be considered to be normal, and it may be determined that the abnormality is in the expansion valve 26 or that the refrigerant is insufficient due to a refrigerant leak. Furthermore, when at least one of the process of determining whether the above formula 1 is satisfied (S14) and the process of determining whether the above formula 2 is satisfied (S15) is not satisfied (S14: NO or S15: NO), the measured temperatures of the multiple temperature sensors (first temperature sensors 281 to 285, second temperature sensors 291 to 295) during the reverse cycle operation are obtained, and when a certain temperature change or more is recognized, the compressor 27 may be considered to be normal, and it may be determined that the abnormality is in the expansion valve 26 or that the refrigerant is insufficient due to a refrigerant leak.

[0061] Next, the operation of the abnormality detection system 10 when the reverse cycle operation is the cooling operation will be described with reference to FIG.

[0062] When the air conditioning control unit 21 stops the air conditioning operation due to an error during heating operation, the abnormality detection system 10 executes a temperature judgment process, and the judgment unit 12 judges that all of the multiple temperature sensors are normal (Figure 2: S5), the abnormality detection system 10 causes the air conditioning control unit 21 to start cooling operation (S21).

[0063] The abnormality detection system 10 waits until a predetermined time has elapsed during which the cooling operation cycle state becomes stable (S22).

[0064] The temperature acquisition unit 11 acquires the measured temperatures (plurality of measured temperatures) of the plurality of temperature sensors (first temperature sensors 281-285, second temperature sensors 291-295) provided in the air conditioner 20 (S23).

[0065] The judgment unit 12 performs a judgment process to determine whether or not the above formula 3 is satisfied using the discharge temperature (the temperature of the air outlet of the indoor unit 201), the indoor heat exchanger temperature, and the indoor temperature (the temperature of the air inlet of the indoor unit 201) from among the multiple acquired measured temperatures (S24).

[0066] If the above formula 3 is satisfied (S24: YES), the judgment unit 12 performs a judgment process to determine whether the above formula 4 is satisfied using the outdoor temperature (outdoor air temperature) and the outdoor heat exchanger temperature from among the multiple acquired measured temperatures (S25).

[0067] When the above formula 4 is satisfied (S25: YES), the determination unit 12 determines that the four-way valve 24 in the cycle mechanism 200 is abnormal (S26).

[0068] If the above formula 3 is not satisfied (S24: NO), the determination unit 12 determines that there is an abnormality in the compressor 27 or the like of the cycle mechanism 200 (S27). Specifically, the determination unit 12 determines that there is an abnormality in the compressor 27, an abnormality in the expansion valve 26, or an abnormality in the refrigerant (such as the absence of refrigerant).

[0069] If the above formula 4 does not hold (S25: NO), similarly to when the above formula 3 does not hold (S24: NO), the judgment unit 12 judges that an abnormality exists in the compressor 27 or the like of the cycle mechanism 200 (S27).

[0070] The process of determining whether the above formula 3 is satisfied (S24) and the process of determining whether the above formula 4 is satisfied (S25) may be performed simultaneously, or the order of the processes may be reversed. In addition, when only one of the above formula 3 or formula 4 is satisfied (only one of S24 and S25 is YES), the compressor 27 may be considered to be normal, and it may be determined that the abnormality is in the expansion valve 26 or that the refrigerant is insufficient due to a refrigerant leak. Furthermore, when at least one of the process of determining whether the above formula 3 is satisfied (S24) and the process of determining whether the above formula 4 is satisfied (S25) is not satisfied (S24: NO or S25: NO), the measured temperatures of the multiple temperature sensors (first temperature sensors 281 to 285, second temperature sensors 291 to 295) during the reverse cycle operation are obtained, and when a certain temperature change or more is recognized, the compressor 27 may be considered to be normal, and it may be determined that the abnormality is in the expansion valve 26 or that the refrigerant is insufficient due to a refrigerant leak.

[0071] When the cycle determination process determines which part of the cycle mechanism 200 is abnormal as described above, the output unit 13 outputs the determination result to the communication unit 22 of the air conditioner 20 via the communication unit 31 and the communication line NT. The air conditioner 20 outputs the received determination result to, for example, a terminal of a repair shop.

[0072] As described above, according to this embodiment, the temperature determination process not only determines whether the cause of the error stop is due to an abnormality in the temperature sensor and identifies the abnormal temperature sensor, but also identifies where the abnormality is in the cycle mechanism 200. In other words, when the air-conditioning operation stops due to an error, it is possible to determine whether the cause is an abnormality in the temperature sensor itself or an abnormality in the measurement location where the temperature sensor measures the temperature (for example, a four-way valve), and identify where the abnormality is. Therefore, the repair technician can omit the task of identifying the location of the abnormality, thereby shortening the time required for repair work.

[0073] (Modification) The following describes a modified example of the anomaly detection system 10 of this embodiment. In the following description, the same components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

[0074] (Variation 1) In the above embodiment, the determination unit 12 determines whether each of the multiple temperature sensors (first temperature sensors 281-285, second temperature sensors 291-295) is normal or not after a predetermined time from the error stop, but the present invention is not limited to this. The determination unit 12 may determine whether each of the multiple temperature sensors is normal or not based on the change over time of each of the multiple measured temperatures. Specifically, the air conditioning control unit 21 transmits to the anomaly detection system 10, after the predetermined time, the measured temperatures that are consecutive in time from the error stop until a predetermined time has elapsed. Then, the similarity between the curve of the change over time of the measured temperature at the predetermined time and the curve of the change over time of the temperature sensor in the normal state is calculated. For example, a cross-correlation coefficient is used as the similarity. Then, the determination unit 12 determines that the temperature sensor is normal if the similarity is less than a threshold value, and determines that the temperature line is abnormal if the similarity is equal to or greater than the threshold value.

[0075] (Variation 2) In the above embodiment, the anomaly detection system 10 is provided in the server 30, but this is not limited to the above. The anomaly detection system 10 may be provided in an air conditioner 20, as shown in Fig. 5. In this case, the same effects as those of the above embodiment can be obtained.

[0076] (Variation 3) In the above embodiment, an example has been shown in which the judgment unit 12 compares each of the second measured temperatures with the second representative value Trp2 for the second temperature sensors 291-295 to judge whether or not there is an abnormality in the second temperature sensors 291-295, but this is not limiting. For example, the temperature acquisition unit 11 may acquire temperature data for an area in which the outdoor unit 202 is installed from a weather server having weather data for that area via the communication line NT, and the judgment unit 12 may compare the temperature data with each of the second measured temperatures.

[0077] (Variation 4) In the above embodiment, the average value of a plurality of measured temperatures is used as the representative value, but this is not limiting. Instead of the average value, the median, the mode, or the like may be used as the representative value. [Explanation of symbols]

[0078] 10 Anomaly Detection System 11 Temperature acquisition section 12 Judgment section 13 Output section 20 Air conditioner 21 Air conditioning control unit 22 Communications Department 23 Indoor heat exchanger 24 Four-way valve 25 Outdoor heat exchanger 26 Expansion valve 27 Compressor 281~285 First temperature sensor 291~295 Second temperature sensor

Claims

1. An abnormality detection system for detecting an abnormality in an air conditioner having a plurality of temperature sensors and a cycle mechanism for circulating a refrigerant, a temperature acquisition unit that acquires a plurality of measured temperatures measured by the plurality of temperature sensors; a determination unit that performs a determination process to determine whether or not the air conditioner is normal based on the plurality of measured temperatures acquired by the temperature acquisition unit; an output unit that outputs a determination result of the determination unit; The determination unit is performing a temperature determination process for determining whether each of the plurality of temperature sensors is normal based on the plurality of measured temperatures when the air conditioning operation of the air conditioner is stopped; when it is determined in the temperature determination process that all of the plurality of temperature sensors are normal, a cycle determination process is performed to determine where an abnormality exists in the cycle mechanism based on the plurality of measured temperatures in a reverse cycle operation execution state in which a direction of the refrigerant cycle in the cycle mechanism is opposite to a direction of the refrigerant cycle in an operation state before the stopped state. Anomaly detection system.

2. the determination unit determines whether or not each of the plurality of temperature sensors is normal based on a comparison result obtained by comparing a representative value of the plurality of measured temperatures with each of the plurality of measured temperatures in the temperature determination process. The anomaly detection system according to claim 1 .

3. the plurality of temperature sensors include a plurality of first temperature sensors disposed indoors and a plurality of second temperature sensors disposed outdoors; The determination unit is determining whether each of the first temperature sensors is normal or not based on a first comparison result obtained by comparing a representative value of the first measured temperatures of the first temperature sensors with each of the first measured temperatures; determining whether each of the second temperature sensors is normal or not based on a second comparison result obtained by comparing a representative value of the second measured temperatures of the second temperature sensors with each of the second measured temperatures; The anomaly detection system according to claim 1 or 2.

4. the determination unit determines whether each of the plurality of temperature sensors is normal based on changes over time of each of the plurality of measured temperatures. The anomaly detection system according to claim 1 .

5. the determination unit determines whether each of the plurality of temperature sensors is normal when an air conditioning operation of the air conditioner is stopped due to an abnormality in a measured temperature of at least one of the plurality of temperature sensors. The anomaly detection system according to any one of claims 1 to 4.

6. the determination unit determines whether each of the plurality of temperature sensors is normal after a predetermined time has elapsed since the error stop. The anomaly detection system according to claim 5 .

7. The air conditioning control unit further includes an air conditioning control unit that executes the reverse cycle operation in which the direction of the refrigerant cycle in the cycle mechanism is opposite to the direction of the refrigerant cycle before the error stop when the determination unit determines that all of the plurality of temperature sensors are normal in the temperature determination process. The anomaly detection system according to claim 5 or 6.

8. An anomaly detection system according to any one of claims 1 to 7; An air conditioning control unit that controls air conditioning operation, Air conditioner.

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