JP2022095008A - Abnormality detection system and air conditioner - Google Patents

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

The present invention relates to an abnormality detection system and an air conditioner.

Patent Document 1 discloses an air conditioner that detects a temperature thermistor (temperature sensor) in which a mounting defect has occurred in an air conditioner provided with a plurality of outdoor units.

Japanese Patent No. 5516295

If an abnormality occurs in the temperature sensor, the measured temperature may become an abnormal temperature. Therefore, when the measured temperature of the temperature sensor is an abnormal temperature, it is difficult to determine whether the cause is an abnormality of the temperature sensor itself or an abnormality of the measurement point of the temperature sensor.

Therefore, one aspect of the present invention is to provide an abnormality detection system and an air conditioner for detecting an abnormality of a plurality of temperature sensors provided in an air conditioner.

The abnormality detection system according to one aspect of the present invention is an abnormality detection system for detecting an abnormality in an air conditioner having a plurality of temperature sensors, and is a temperature acquisition system for acquiring 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 a determination unit that outputs the determination result of the determination unit. It has an output unit. The determination unit performs temperature determination processing for determining whether or not each of the plurality of temperature sensors is normal, based on the plurality of measured temperatures in the stopped state of the air conditioning operation of the air conditioner.

The 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.

FIG. 1 is a block diagram of an abnormality detection system and an air conditioner according to an embodiment. FIG. 2 is a flowchart for explaining the operation of the temperature determination process of the abnormality detection system shown in FIG. 1. FIG. 3 is a flowchart for explaining the operation of the cycle determination process performed when the air conditioner stops due to an error during the cooling operation and all the temperature sensors are determined to be normal. FIG. 4 is a flowchart for explaining the operation of the cycle determination process performed when the air conditioner stops due to an error during the heating operation and all the temperature sensors are determined to be normal. FIG. 5 is a block diagram of an air conditioner according to a modified example.

The embodiments and modifications described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiments and modifications. Even if it is not the embodiment and the modification, various changes can be made according to the design and the like as long as it does not deviate from the technical idea of the present disclosure.

(Embodiment)
Hereinafter, the abnormality detection system 10 and the air conditioner 20 of the present embodiment will be described with reference to FIG.

The abnormality detection system 10 is configured to detect whether or not there is an abnormality in a plurality of temperature sensors provided in the air conditioner 20.

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 to 285, second temperature sensors 291 to 295) are provided, and are configured to perform air conditioning operation. Air conditioning operation includes cooling operation and heating operation.

The indoor heat exchanger 23, the four-way valve 24, the outdoor heat exchanger 25, the expansion valve 26, and the compressor 27 constitute a cycle mechanism 200 for circulating the refrigerant. In this cycle mechanism 200, the direction in which the refrigerant circulates is opposite between the cooling operation and the heating operation.

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

Among the components of the cycle mechanism 200, the indoor heat exchanger 23 is provided in the indoor unit 201. Among 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.

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 execute air conditioning.

The communication unit 22 is a communication interface and is connected to the communication line NT via a router, a gateway, or the like. The communication unit 22 can communicate with the communication unit 31 of the server 30 via the communication line NT.

The plurality of temperature sensors include a plurality of first temperature sensors 281, 282, 283, 284, 285 provided in the indoor unit 201, and a plurality of second temperature sensors 291, 292, 293, 294 provided in the outdoor unit 202. 295 and. As the plurality of temperature sensors, for example, a thermistor can be used.

The first temperature sensors 281 to 285 are, for example, air taken in from the intake port of the indoor unit 201 (indoor temperature), air blown out from the air outlet, and refrigerants before and after passing through the indoor heat exchanger 23, respectively. Measure the temperature of the drive motor of the indoor fan.

The second temperature sensors 291 to 295 are, 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 suction side (suction temperature) and the discharge side (discharge temperature) of the compressor 27, respectively. Hereinafter, it is also simply referred to as “discharge temperature”.) The temperature of each refrigerant is measured.

The air conditioner control unit 21 sets the measured temperature of each of the plurality of temperature sensors (first temperature sensors 281 to 285, second temperature sensors 291 to 295) in a predetermined cycle (for example, 1 minute, 5 minutes, 10 minutes, etc.) during the air conditioning operation. ) To determine if there is any abnormality in the measured temperature. The air conditioning control unit 21 compares the acquired measured temperature of each temperature sensor with a predetermined temperature threshold corresponding to each temperature sensor in order to determine whether or not there is an abnormality in the measured temperature. If any one of the plurality of measured temperatures of the plurality of temperature sensors exceeds the corresponding temperature threshold, the air conditioning control unit 21 determines that there is some abnormality in the cycle mechanism 200, and stops the air conditioning operation with an error. Judgment as to whether or not there is an abnormality in the measured temperature is not limited to this, and the cycle is performed when the measured temperatures of multiple temperature sensors are compared and the magnitude of the normal state and the sensor measured temperature are reversed or the difference is out of the threshold. It may be determined that the mechanism 200 has some abnormality.

When the air conditioning operation is stopped due to an error, the air conditioning control unit 21 transmits the measured temperature of each temperature sensor to the abnormality 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 temperature of each temperature sensor after a predetermined time has elapsed from the error stop to the abnormality detection system 10. The predetermined time is preferably longer than the time until the temperature of each temperature sensor changes to the steady temperature, for example, 15 minutes, 30 minutes, 1 hour, and the like.

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 the plurality of temperature sensors (first temperature sensors 281 to 285 and second temperature sensors 291 to 295) is normal. ..

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 the measurement temperatures (plurality of first measurement temperatures) of the plurality of first temperature sensors 281 to 285. The second temperature acquisition unit 112 acquires the measurement temperatures (plurality of second measurement temperatures) of the plurality of second temperature sensors 291 to 295.

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

The determination unit 12 calculates the average value of the plurality of first measurement temperatures acquired by the first temperature acquisition unit 111 as a representative value (first representative value Trp1) of the plurality of first measurement temperatures. Then, the determination unit 12 compares each of the plurality of first measurement temperatures with the first representative value Trp1. Specifically, the determination unit 12 calculates the difference between each of the plurality of first measurement temperatures and the first representative value Trp1. When the absolute value of each of the plurality of differences is all less than the predetermined temperature threshold value Tth (for example, 3 ° C.), the determination unit 12 determines that all of the plurality of first temperature sensors 281 to 285 are normal. When there is a difference whose absolute value is equal to or higher than the temperature threshold value Tth among the plurality of differences, the determination unit 12 determines that the first temperature sensor corresponding to the difference is abnormal, and the other first temperature sensors are normal. Is determined to be. In this way, the determination unit 12 identifies the abnormal first temperature sensor among the plurality of first temperature sensors.

As a specific example, when the measured temperatures of the plurality of first temperature sensors 281 to 285 are as shown in Table 1 below, the first representative value Trp1 is 26.6 ° C. As described above, when the temperature threshold Tth is set to 3 ° C., the absolute value of the difference between the measured temperature of the first temperature sensor 285 and the first representative value Trp1 is 3.4 ° C. , The temperature threshold is Tth or higher. Therefore, the determination unit 12 determines that the first temperature sensor 285 is abnormal, and determines that the other first temperature sensors 281 to 284 are normal.

The determination unit 12 calculates the average value of the plurality of second measurement temperatures acquired by the second temperature acquisition unit 112 as a representative value (second representative value Trp2) of the plurality of second measurement temperatures. Then, the determination unit 12 compares each of the plurality of second measurement temperatures with the second representative value Trp2. Specifically, the determination unit 12 calculates the difference between each of the plurality of second measurement temperatures and the second representative value Trp2. When the absolute value of each of the plurality of differences is all less than the temperature threshold value Tth, the determination unit 12 determines that all of the plurality of second temperature sensors 291 to 295 are normal. When there is a difference whose absolute value is equal to or higher than the temperature threshold Tth among the plurality of differences, the determination unit 12 determines that the second temperature sensor corresponding to the difference is abnormal, and the other second temperature sensors are normal. Is determined to be. In this way, the determination unit 12 identifies the second temperature sensor having an abnormality among the plurality of second temperature sensors.

As a specific example, when the measured temperatures of the plurality of second temperature sensors 291 to 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 measured temperature of the second temperature sensor 294 of 35 ° C. and the second representative value Trp2 is 3.2 ° C., which is , The temperature threshold is Tth or higher. Therefore, the determination unit 12 determines that the second temperature sensor 294 is abnormal, and determines that the other second temperature sensors 291 to 293 and 295 are normal.

In the above, as an example, the case where the plurality of first temperature sensors 281 to 285 and the plurality of second temperature sensors 291 to 295 each include one abnormal temperature sensor has been described, but the present invention is limited to this. do not have. When only one of the plurality of first temperature sensors 281 to 285 and the plurality of second temperature sensors 291 to 295 contains an abnormal temperature sensor, or two of the plurality of first temperature sensors 281 to 285. As mentioned above, there are cases where an abnormal temperature sensor is included. Of course, there are cases where all of the plurality of first temperature sensors 281 to 285 and the plurality of second temperature sensors 291 to 295 are normal.

Next, the operation of the temperature determination process of the abnormality detection system 10 will be described with reference to the flowchart shown in FIG. Here, an operation of determining whether or not there is an abnormality in the plurality of first temperature sensors 281 to 285 by the abnormality detection system 10 will be described.

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

The determination unit 12 calculates the first representative value Trp1 from the plurality of first measurement temperatures (S2).

The determination unit 12 calculates the difference between each of the plurality of first measurement temperatures and the first representative value Trp1 (S3).

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

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

When all the absolute values of the plurality of differences are not less than the temperature threshold value Tth (S4: NO), the determination unit 12 identifies the first temperature sensor having an abnormality (S6).

Regarding the operation of the temperature determination process for determining whether or not there is an abnormality in the plurality of second temperature sensors 291 to 295 by the abnormality detection system 10, whether or not there is an abnormality in the plurality of first temperature sensors 281 to 285. Since the operation is the same as that described above, the description thereof will be omitted.

When the determination unit 12 identifies an abnormal temperature sensor in the temperature determination process, the output unit 13 outputs a determination result including identification information for identifying the abnormal temperature sensor via the communication unit 31 and the communication line NT. It is output to the communication unit 22 of the air conditioner 20. The air conditioner 20 outputs the received determination result to, for example, the terminal of the repair company. As a result, the repair company can know in advance that the cause of the error stop in the air conditioning operation is an abnormality in the temperature sensor, so that the work of identifying the abnormal part can be omitted to shorten the repair work time. Can be done.

On the other hand, when the determination unit 12 determines in the temperature determination process that all of the plurality of temperature sensors (first temperature sensors 281 to 285, second temperature sensors 291 to 295) are normal, the output unit 13 outputs all of them. The determination result indicating that the temperature sensor is normal is output to the air conditioner 20. Specifically, the output unit 13 outputs a determination result indicating that all 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 determination result to, for example, the terminal of the repair company.

As described above, according to the present embodiment, when the air conditioning control unit 21 stops the air conditioning operation with an error, it can be determined whether or not the cause of the error stop is due to an abnormality of the temperature sensor. Further, when the abnormality of the temperature sensor is the cause of the error stop, the temperature sensor having the abnormality can be identified.

Further, the abnormality detection system 10 of the present embodiment performs a cycle determination process of determining where the abnormality is in the cycle mechanism 200 when the determination unit 12 determines that all of the plurality of temperature sensors are normal.

Specifically, when the determination unit 12 determines that all of the plurality of temperature sensors are normal, the abnormality detection system 10 causes the air conditioning control unit 21 to execute the reverse cycle operation. The reverse cycle operation means an air conditioning operation in which the cycle direction of the refrigerant is opposite to that of the air conditioning operation performed immediately before the error stop. For example, when the air conditioning operation immediately before the error stop is the cooling operation, the reverse cycle operation is the heating operation. When the determination unit 12 determines that all of the plurality of temperature sensors are normal, the output unit 13 outputs a reverse cycle operation instruction to the communication unit 22 of the air conditioner 20 via the communication unit 31 and the communication line NT. do.

When the air conditioner 20 receives an instruction for reverse cycle operation, the air conditioning control unit 21 executes reverse cycle operation.

The air conditioning control unit 21 acquires the measured temperatures of each of the plurality of temperature sensors (first temperature sensors 281 to 285 and second temperature sensors 291 to 295) after a predetermined time has elapsed from the start of the reverse cycle operation. The air conditioning control unit 21 transmits each of the acquired measured temperatures to the abnormality 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 until the cycle state of the reverse cycle operation stabilizes, and is, for example, 5 minutes, 10 minutes, 15 minutes, or the like.

The determination unit 12 of the abnormality detection system 10 determines where in the cycle mechanism 200 there is an abnormality based on each measured temperature.

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, for example, determining whether or not the following equations 1 and 2 are satisfied. do.
Discharge temperature> Indoor heat exchanger temperature> Indoor temperature +5 ... (1)
Outdoor temperature> Outdoor heat exchanger temperature ・ ・ ・ (2)

Further, when the reverse cycle operation is the cooling operation, the determination unit 12 determines where in the cycle mechanism 200 there is an abnormality, for example, by determining whether or not the following equations 3 and 4 are satisfied.
Discharge temperature> Outdoor heat exchanger temperature> Outdoor temperature ... (3)
Room temperature> Room heat exchanger temperature +5 ・ ・ ・ (4)

Next, the operation of the cycle determination process of the abnormality detection system 10 will be described with reference to the flowcharts shown in FIGS. 3 and 4. FIG. 3 is a flowchart showing an operation when the air conditioning operation immediately before the error stop is the cooling operation and the reverse cycle operation is the heating operation. FIG. 4 is a flowchart showing an operation when the air conditioning operation immediately before the error stop is the heating operation and the reverse cycle operation is the cooling operation. First, the operation of the abnormality detection system 10 when the reverse cycle operation is the heating operation will be described with reference to FIG.

When the air conditioning control unit 21 stops the air conditioning operation with an error during the cooling operation, the abnormality detection system 10 executes the temperature determination process, and the determination unit 12 determines that all of the plurality of temperature sensors are normal (FIG. 2: S5). ), The abnormality detection system 10 causes the air conditioning control unit 21 to start the heating operation (S11).

The abnormality detection system 10 waits until a predetermined time for stabilizing the cycle state of the heating operation elapses (S12).

The temperature acquisition unit 11 acquires the measurement temperature (plurality of measurement temperatures) of each of the plurality of temperature sensors (first temperature sensors 281 to 285, second temperature sensors 291 to 295) provided in the air conditioner 20 (S13). ).

The determination unit 12 uses the discharge temperature (the temperature of the outlet of the indoor unit 201), the indoor heat exchanger temperature, and the indoor temperature (the temperature of the air supply port of the indoor unit 201) from among the plurality of acquired measured temperatures. Then, a determination process is performed to determine whether or not the above equation 1 is satisfied (S14).

When the above equation 1 is satisfied (S14: YES), the determination unit 12 establishes the above equation 2 by using the outdoor temperature (outside air temperature) and the outdoor heat exchanger temperature from the acquired plurality of measured temperatures. Whether or not it is determined is performed (S15).

When the above equation 2 is satisfied (S15: YES), the determination unit 12 determines that the four-way valve 24 of the cycle mechanism 200 has an abnormality (S16).

When the above equation 1 does not hold (S14: NO), the determination unit 12 determines that the compressor 27 or the like of the cycle mechanism 200 has an abnormality (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 deficiency due to a refrigerant leak.

Similar to the case where the above equation 2 does not hold (S15: NO) and the above formula 1 does not hold (S14: NO), the determination unit 12 determines that the compressor 27 or the like in the cycle mechanism 200 has an abnormality. (S17).

The process of determining whether or not the above equation 1 is satisfied (S14) and the process of determining whether or not the above equation 2 is satisfied (S15) may be performed at the same time, or the order may be changed. Further, when only one of the above formula 1 or the above formula 2 is satisfied (only one of S14 and S15 is YES), the compressor 27 is considered to be normal, and the expansion valve 26 is abnormal or the refrigerant is used. It may be determined that the refrigerant is abnormal such as a refrigerant deficiency due to leakage. Further, when at least one of the determination process (S14) for determining whether the above equation 1 is satisfied and the determination process (S15) for determining whether the above equation 2 is satisfied is not satisfied (S14: NO or S15: NO). ) Acquires the measured temperatures of each of the plurality of temperature sensors (first temperature sensors 281 to 285, second temperature sensors 291 to 295) during the reverse cycle operation, and even when a temperature change of a certain level or more is observed, the compressor 27 may be regarded as normal, and may be determined to be an abnormality of the expansion valve 26 or an abnormality of the refrigerant such as a refrigerant deficiency due to the leakage of the refrigerant.

Next, with reference to FIG. 4, the operation of the abnormality detection system 10 when the reverse cycle operation is the cooling operation will be described.

When the air conditioning control unit 21 stops the air conditioning operation with an error during the heating operation, the abnormality detection system 10 executes the temperature determination process, and the determination unit 12 determines that all of the plurality of temperature sensors are normal (FIG. 2: S5). ), The abnormality detection system 10 causes the air conditioning control unit 21 to start the cooling operation (S21).

The abnormality detection system 10 waits until a predetermined time for stabilizing the cycle state of the cooling operation elapses (S22).

The temperature acquisition unit 11 acquires the measurement temperature (plurality of measurement temperatures) of each of the plurality of temperature sensors (first temperature sensors 281 to 285, second temperature sensors 291 to 295) provided in the air conditioner 20 (S23). ).

The determination unit 12 uses the discharge temperature (the temperature of the outlet of the indoor unit 201), the indoor heat exchanger temperature, and the indoor temperature (the temperature of the air supply port of the indoor unit 201) from among the plurality of acquired measured temperatures. Then, a determination process is performed to determine whether or not the above equation 3 is satisfied (S24).

When the above formula 3 is satisfied (S24: YES), the determination unit 12 holds the above formula 4 by using the outdoor temperature (outside air temperature) and the outdoor heat exchanger temperature from the acquired plurality of measured temperatures. Whether or not it is determined is performed (S25).

When the above equation 4 is satisfied (S25: YES), the determination unit 12 determines that the four-way valve 24 of the cycle mechanism 200 has an abnormality (S26).

When the above equation 3 does not hold (S24: NO), the determination unit 12 determines that the compressor 27 or the like of the cycle mechanism 200 has an abnormality (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 (no refrigerant, etc.).

Similar to the case where the above formula 4 does not hold (S25: NO) and the above formula 3 does not hold (S24: NO), the determination unit 12 determines that the compressor 27 or the like in the cycle mechanism 200 has an abnormality. (S27).

The process of determining whether or not the above equation 3 is satisfied (S24) and the process of determining whether or not the above equation 4 is satisfied (S25) may be performed at the same time, or the order may be changed. Further, when only one of the above formula 3 or the above formula 4 is satisfied (only one of S24 and S25 is YES), the compressor 27 is regarded as normal, and the expansion valve 26 is abnormal or the refrigerant is used. It may be determined that the refrigerant is abnormal such as a refrigerant deficiency due to leakage. Further, when at least one of the determination process (S24) for determining whether the above equation 3 is satisfied and the determination process (S25) for determining whether the above equation 4 is satisfied is not satisfied (S24: NO or S25: NO). ) Acquires the measured temperatures of each of the plurality of temperature sensors (first temperature sensors 281 to 285, second temperature sensors 291 to 295) during the reverse cycle operation, and even when a temperature change of a certain level or more is observed, the compressor 27 may be regarded as normal, and may be determined to be an abnormality of the expansion valve 26 or an abnormality of the refrigerant such as a refrigerant deficiency due to the leakage of the refrigerant.

As described above, when the cycle determination process determines where the abnormality is in the cycle mechanism 200, the output unit 13 communicates the determination result with the air conditioner 20 via the communication unit 31 and the communication line NT. Output to unit 22. The air conditioner 20 outputs the received determination result to, for example, the terminal of the repair company.

As described above, according to the present embodiment, the temperature determination process can determine whether or not the cause of the error stop is due to an abnormality in the temperature sensor, and not only can identify the temperature sensor having the abnormality, but also the cycle mechanism. It is also possible to identify where in 200 the abnormality is. That is, when the air conditioning operation stops due to an error, it is determined whether the cause is an abnormality in the temperature sensor itself or an abnormality in the measurement point (for example, a four-way valve) where the temperature sensor is measuring the temperature, and where the abnormality is. It is possible to identify whether there is. Therefore, the repair company can shorten the repair work time by omitting the work of identifying the abnormal portion.

(Modification example)
Hereinafter, a modified example of the abnormality detection system 10 of the present embodiment will be described. In the following description, the same components as those in the above-described embodiment will be designated by the same reference numerals and description thereof will be omitted as appropriate.

(Modification 1)
In the above embodiment, the determination unit 12 determines whether or not each of the plurality of temperature sensors (first temperature sensors 281 to 285 and second temperature sensors 291 to 295) is normal after a predetermined time from the error stop. An example is shown, but it is not limited to this. The determination unit 12 may determine whether or not each of the plurality of temperature sensors is normal based on the time course of each of the plurality of measurement temperatures. Specifically, the air-conditioning control unit 21 collectively transmits the time-continuous measurement temperatures from the error stop to the predetermined time after the predetermined time to the abnormality detection system 10. Then, the degree of similarity between the curve of the time-dependent change of the measured temperature at a predetermined time and the curve of the time-dependent change of the temperature sensor at the normal time is calculated. For the degree of similarity, for example, a mutual correlation coefficient is used. Then, the determination unit 12 determines that the temperature sensor is normal when the similarity is less than the threshold value, and determines that the temperature line is abnormal when the similarity is equal to or higher than the threshold value.

(Modification 2)
In the above embodiment, the abnormality detection system 10 is provided in the server 30, but the abnormality detection system 10 is not limited to this. As shown in FIG. 5, the abnormality detection system 10 may be provided in the air conditioner 20. In this case as well, the same effect as that of the above embodiment can be obtained.

(Modification 3)
In the above embodiment, regarding the plurality of second temperature sensors 291 to 295, the determination unit 12 compares each of the plurality of second measurement temperatures with the second representative value Trp2, and the second temperature sensors 291 to 295 have an abnormality. An example of determining whether or not there is a sensor is shown, but the present invention is not limited to this. For example, the temperature acquisition unit 11 acquires the temperature data of the area from the weather server having the weather data of the area where the outdoor unit 202 is provided via the communication line NT, and the determination unit 12 acquires the temperature data of the area and a plurality of the temperature data. The second measurement temperature may be compared with each other.

(Modification example 4)
In the above embodiment, an example in which the average value of a plurality of measured temperatures is used as a representative value is shown, but the present invention is not limited to this. As a representative value, a median value, a mode value, or the like may be used instead of the average value.

10 Abnormality detection system 11 Temperature acquisition unit 12 Judgment unit 13 Output unit 20 Air conditioner 21 Air conditioning control unit 22 Communication unit 23 Indoor heat exchanger 24 Four-way valve 25 Outdoor heat exchanger 26 Expansion valve 27 Compressor 281 to 285 First temperature Sensor 291-295 Second temperature sensor

Claims (8)

An abnormality detection system that detects abnormalities in air conditioners that have multiple temperature sensors.
A temperature acquisition unit that acquires a plurality of measured temperatures measured by the plurality of temperature sensors, and a temperature acquisition unit.
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.
An output unit for outputting the determination result of the determination unit is provided.
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 in the stopped state of the air conditioning operation of the air conditioner.
Anomaly detection system. The determination unit determines whether or not each of the plurality of temperature sensors is normal based on the comparison result of comparing the representative values of the plurality of measurement temperatures with each of the plurality of measurement temperatures in the temperature determination process. To judge whether
The abnormality detection system according to claim 1. The plurality of temperature sensors include a plurality of first temperature sensors arranged indoors and a plurality of second temperature sensors arranged outdoors.
The determination unit
Each of the plurality of first temperature sensors is based on the first comparison result of comparing the representative value of the plurality of first measurement temperatures of the plurality of first temperature sensors with each of the plurality of first measurement temperatures. Judge whether it is normal or not,
Each of the plurality of second temperature sensors is based on the second comparison result of comparing the representative value of the plurality of second measured temperatures of the plurality of second temperature sensors with each of the plurality of second measured temperatures. Judging whether it is normal or not,
The abnormality detection system according to claim 1 or 2. The determination unit determines whether or not each of the plurality of temperature sensors is normal based on the time course of each of the plurality of measurement temperatures.
The abnormality detection system according to claim 1. In the determination unit, when the air conditioning operation of the air conditioner stops due to an abnormality in the measured temperature of at least one of the plurality of temperature sensors, each of the plurality of temperature sensors is normal. Judge whether or not,
The abnormality detection system according to any one of claims 1 to 4. The determination unit determines whether or not each of the plurality of temperature sensors is normal after a predetermined time from the error stop.
The abnormality detection system according to claim 5. The air conditioner has a cycle mechanism for circulating a refrigerant.
When the determination unit determines that all of the plurality of temperature sensors are normal in the temperature determination process, the direction of the refrigerant cycle in the cycle mechanism is opposite to the direction of the refrigerant cycle before the error stop. Further equipped with an air conditioning control unit that executes cycle operation,
When the determination unit determines that all of the plurality of temperature sensors are normal in the temperature determination process, the cycle mechanism is based on the plurality of measured temperatures in the execution state of the reverse cycle operation of the air conditioner. Performs cycle judgment processing to determine where the abnormality is.
The abnormality detection system according to claim 5 or 6. The abnormality detection system according to any one of claims 1 to 7.
It is equipped with an air conditioning control unit that controls air conditioning operation.
Air conditioner.

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