JP4479565B2 - Anomaly detection system - Google Patents

Description

  The present invention relates to an abnormality detection system, and more particularly to an abnormality detection system for an air conditioner.

Currently, many abnormality detection systems for detecting an abnormality in an air conditioner have been proposed. Some of these abnormality detection systems use past operation state data of the air conditioner to detect an abnormality. For example, in Patent Document 1, the current operation state data at the time of executing the abnormality detection operation is set as detection target data, and the past operation state data at the initial operation of the air conditioner is set as comparison target data. An abnormality is detected. Note that the operation state data referred to here includes various state quantities relating to the devices constituting the air conditioner, for example, the temperature and pressure of the refrigerant in the compressor, heat exchanger, etc. constituting the air conditioner.
Japanese Patent Application Laid-Open No. 2004-169989

  However, in the abnormality detection system of Patent Document 1, the detection target data and the comparison target data include not only operating state data under similar operating conditions but also operating state data under different operating conditions. When comparing the operating state data under such different operating conditions, there is a possibility that the operating state data at the time of abnormality and the operating state data at the time of normal operation cannot be accurately determined due to the influence of the difference in the characteristics of the different operating conditions. Yes, it can lead to misjudgment in anomaly detection.

  The subject of this invention is providing the abnormality detection system which can detect abnormality in an air conditioning apparatus in consideration of an operating condition.

  The abnormality detection system according to the first invention includes a first acquisition device, a second acquisition device, a storage device, and a detection device. The first acquisition device acquires first operating condition data indicating operating conditions of the first air conditioner and first operating state data of the first air conditioner under the operating conditions. The second acquisition device acquires second operating condition data indicating the operating conditions of the second air conditioner and second operating state data of the second air conditioner under the operating conditions. The storage device stores the first operating condition data, the first operating state data, the second operating condition data, and the second operating state data acquired by the first acquiring device and the second acquiring device. The detection device, when the first operation state data acquired by the first acquisition device is sufficiently stored in the storage device, the current first operation state data and the operation If the first operating state data is not sufficiently stored in the storage device as compared with the past first operating state data stored in the storage device in which at least a part of the conditions are equal, the current first operating state An abnormality in the first air conditioner is detected by comparing the past second operation state data stored in the storage device in which at least a part of the operation conditions is the same as the data with the comparison target data including at least a part thereof.

  An abnormality detection system according to a second aspect of the present invention is the abnormality detection system according to the first aspect of the present invention, wherein the operating conditions are the activation states of the indoor units constituting the first air conditioner and the second air conditioner, and the operation of the indoor units. It relates to at least one of mode, outside air temperature, and room temperature.

  An abnormality detection system according to a third aspect of the present invention is the abnormality detection system according to the first or second aspect of the present invention, wherein the first acquisition device is a first air conditioner in a first property where the first air conditioner is installed. It is a device that manages devices. The second acquisition device is a device that manages the second air conditioner in a second property where the second air conditioner is installed. The storage device and the detection device are remote from the first property and the second property, and are connected to the first acquisition device and the second acquisition device via an Internet line, a dedicated line, or a telephone line.

  An abnormality detection system according to a fourth aspect of the present invention is the abnormality detection system according to any of the first to third aspects of the present invention, wherein the detection device detects refrigerant leakage in the first air conditioner.

  An abnormality detection system according to a fifth aspect of the present invention is the abnormality detection system according to any of the first to fourth aspects of the present invention, wherein the first operating state data and the second operating state data are the first air conditioner and the second air conditioner. The present invention relates to at least one of the degree of supercooling, the degree of superheat, the low pressure, the high pressure, the outside air temperature, the room temperature, and the compressor speed of the refrigeration cycle of the air conditioner.

An abnormality detection system according to a first aspect related to the present invention includes an acquisition device, a storage device, and a detection device. The acquisition device acquires operation condition data indicating the operation condition of the air conditioner and operation state data of the air conditioner under the operation condition. The storage device stores the operation condition data and the operation state data acquired by the acquisition device. The detection device detects the abnormality in the air conditioner by comparing the current operation state data acquired by the acquisition device with at least a part of the past operation state data stored in the storage device. Is used.

  In this abnormality detection system, when the detection device detects an abnormality in the air conditioner by comparing current operation state data acquired by the acquisition device with at least a part of past operation state data stored in the storage device. In addition, operating condition data is used. Thereby, it is possible to detect an abnormality in the air conditioner in consideration of the operating conditions, and the accuracy of abnormality detection is improved.

An abnormality detection system according to a second aspect related to the present invention is the abnormality detection system according to the first aspect , in which the detection device converts current operation state data into at least a part of current operation state data and operation conditions. Is compared with at least a part of the past driving state data with equal.

  In this abnormality detection system, the detection device compares operation state data having similar operation conditions. Thereby, the accuracy of abnormality detection can be further improved.

The abnormality detection system according to the third aspect relating to the present invention is the abnormality detection system according to the first aspect or the second aspect , wherein the operating conditions are the activation state of the indoor unit constituting the air conditioner, the indoor unit It relates to at least one of an operation mode, outside air temperature, and room temperature.

  In this abnormality detection system, the operation condition relates to at least one of the activation state of the indoor unit constituting the air conditioner, the operation mode of the indoor unit, the outside air temperature, and the indoor temperature. Thereby, the accuracy of abnormality detection can be further improved.

An abnormality detection system according to a fourth aspect related to the present invention is the abnormality detection system according to any one of the first aspect to the third aspect , and the acquisition device is an air conditioner in a property where the air conditioner is installed. Manage the device. The storage device and the detection device are remote from the property, and are connected to the acquisition device via an Internet line, a dedicated line, or a telephone line.

  Recently, local controllers are often installed in properties where air conditioners are installed. Such a local controller manages the operation of the air conditioner, and periodically acquires the operation condition data and the operation state data of the air conditioner for remote management and transmits them to the remote management computer of the remote management center. When such a local controller or the like is already installed, it is not necessary to newly install an acquisition device or the like when introducing the abnormality detection system. Furthermore, even when such a local controller or the like is not installed, the installation method itself of the acquisition device or the like has already been systematized and can be installed relatively easily. As described above, in this abnormality detection system, when the abnormality detection system is introduced, newly installed devices can be minimized, and the burden on the user or the service provider related to the introduction of the abnormality detection system can be reduced. it can. In this anomaly detection system, since the detection device is remote from the property, it is not necessary for the service person to visit the site to operate the detection device, further reducing the cost of the service provider. Can do.

Abnormality detection system according to a fifth aspect related to the present invention, there is provided a fault detection system according the first aspect in any of the fourth aspect, the sensing device detects the refrigerant leakage in the air conditioner.

  This abnormality detection system can detect refrigerant leakage in the air conditioner.

The abnormality detection system according to a sixth aspect related to the present invention is the abnormality detection system according to the first aspect to the fifth aspect , and the operating state data includes a degree of supercooling, a degree of superheat, a degree of supercooling of the refrigeration cycle of the air conditioner, It relates to at least one of a low pressure, a high pressure, an outside air temperature, a room temperature, and a compressor speed.

  In this abnormality detection system, the operating condition data of the air conditioner relates to at least one of the degree of supercooling, the degree of superheat, the low pressure, the high pressure, the outside temperature, the room temperature, and the compressor speed of the refrigeration cycle of the air conditioner. . Thereby, the accuracy of abnormality detection can be further improved.

According to the present invention, it is possible to detect an abnormality in the air-conditioning apparatus in consideration of operating conditions, and the abnormality detection accuracy is improved.

In the abnormality detection system according to the first aspect related to the present invention , the detection device compares the current operation state data acquired by the acquisition device with at least a part of past operation state data stored in the storage device. Operating condition data is used when detecting an abnormality in the air conditioner. Thereby, it is possible to detect an abnormality in the air conditioner in consideration of the operating conditions, and the accuracy of abnormality detection is improved.

In the abnormality detection system according to the second aspect related to the present invention , the detection device compares operation state data having similar operation conditions. Thereby, the accuracy of abnormality detection can be further improved.

In the abnormality detection system according to the third aspect relating to the present invention , the operation condition relates to at least one of the activation state of the indoor unit constituting the air conditioner, the operation mode of the indoor unit, the outside air temperature, and the indoor temperature. Thereby, the accuracy of abnormality detection can be further improved.

In the abnormality detection system according to the fourth aspect related to the present invention , the acquisition device is installed in the same property as the air management device, while the storage device and the detection device are installed remotely from the property where the air management device is installed. Is done. Recently, local controllers are often installed in properties where air conditioners are installed. Such a local controller manages the operation of the air conditioner, and periodically acquires the operation condition data and the operation state data of the air conditioner for remote management and transmits them to the remote management computer of the remote management center. For this reason, when introducing the abnormality detection system, it is possible to minimize newly installed devices and reduce the burden on the user or service provider related to the introduction of the abnormality detection system. In this anomaly detection system, since the detection device is remote from the property, it is not necessary for the service person to visit the site to operate the detection device, further reducing the cost of the service provider. Can do.

The abnormality detection system according to the fifth aspect related to the present invention can detect refrigerant leakage in the air conditioner.

In the abnormality detection system according to the sixth aspect relating to the present invention, the operating state data of the air conditioner includes the degree of supercooling, the degree of superheat, the low pressure, the high pressure, the outside air temperature, the room temperature, and the room temperature of the air conditioner. It relates to at least one of the compressor speeds. Thereby, the accuracy of abnormality detection can be further improved.

<Abnormality detection system configuration>
With reference to FIG. 1, the structure of the abnormality detection system 3 which concerns on one Embodiment of this invention is demonstrated.

  The abnormality detection system 3 detects an abnormality in a plurality of air conditioners including the first air conditioner 10 and the second air conditioner 20. Note that FIG. 1 does not clearly show an air conditioner other than the first air conditioner 10 and the second air conditioner 20, and is omitted in the following description. It is assumed that there is an air conditioner other than 10 and the second air conditioner 20.

  The abnormality detection system 3 is connected to the first air conditioner 10 to manage the first air conditioner 10 and the first local controller (hereinafter referred to as LC) 100 and the second air conditioner 20 to connect the second air. The second LC 200 for managing the harmony device 20, the remote management computer 400 in the remote management center 60 connected to the first LC 100 and the second LC 200 via the Internet line 70, and the remote management computer 400 in the remote management center 60. And a large-capacity storage device 300 connected to the. In FIG. 1, LCs other than the first LC 100 and the second LC 200 are not clearly shown, and are omitted in the following description, but actually, other than the first air conditioner 10 and the second air conditioner 20. It is assumed that there are LCs other than the first LC 100 and the second LC 200 that are connected to the air conditioner in a one-to-one or one-to-many manner and manage the air conditioner in a one-to-one or one-to-many manner.

  The first LC 100 is installed in the first property 110 together with the first air conditioner 10. The second LC 200 is installed in the second property 210 together with the second air conditioner 20.

(Configuration of the first local controller)
The configuration of the first LC 100 will be described with reference to FIG.

  The first LC 100 includes communication units 101 and 103 and a management unit 102.

  The communication unit 101 is connected to the first air conditioner 10 directly or via a dedicated adapter, and transmits and receives data to and from the first air conditioner 10. The communication unit 103 is connected to the remote management computer 400 via the Internet line 70 and exchanges data with the remote management computer 400. The management unit 102 gives an instruction to the communication unit 101 to periodically acquire data related to the operation of the first air conditioner 10 (hereinafter, operation data), or from the remote management computer 400 received by the communication unit 103. The operation of the first air conditioner 10 is managed by, for example, executing a command for the first air conditioner 10. The command from the remote management computer 400 to the first air conditioner 10 includes a command for starting or stopping the operation of the first air conditioner 10 or changing the operation mode from a remote location as necessary.

(Configuration of second local controller)
The configuration of the second LC 200 is the same as the configuration of the first LC 100.

(Configuration of remote management computer)
The configuration of the remote management computer 400 will be described with reference to FIG.

  The remote management computer 400 exists in the remote management center 60 that is remote from the first property 110 and the second property 210. The remote management computer 400 transmits instructions for managing the respective operations to the first LC 100 and the second LC 200 as necessary, and manages the first air conditioner 10 and the second air conditioner 20 from a remote location.

  The remote management computer 400 detects an abnormality in the first air conditioner 10 and the second air conditioner 20. The remote management computer 400 includes communication units 401 and 408, a display unit 404, a CPU 405, a memory 406, and a hard disk (hereinafter referred to as HD) 407.

  The communication unit 408 receives the operation data of the first air conditioner 10 from the first LC 100 and the operation data of the second air conditioner 20 from the second LC 200. The communication unit 401 sequentially sends the operation data received by the communication unit 408 to the large-capacity storage device 300 connected to the remote management computer 400 in the remote management center 60. The CPU 405 detects an abnormality in the first air conditioner 10 and the second air conditioner 20 in cooperation with the memory 406 and the HD 407 according to the control program stored in the HD 407. The display unit 404 is a liquid crystal display, and displays an indication when an abnormality is detected in the first air conditioner 10 and the second air conditioner 20 by the CPU 405. Details of processing by the communication units 401 and 408, the display unit 404, the CPU 405, the memory 406, and the HD 407 will be described later.

(Configuration of mass storage device)
The large-capacity storage device 300 exists in the remote management center 60 and communicates with the remote management computer 400. The large-capacity storage device 300 includes an operation information database 301 (see FIG. 1) that stores operation data of the first air conditioner 10 and the second air conditioner 20. When the mass storage device 300 receives one operation data of the first air conditioner 10 or the second air conditioner 20 from the communication unit 401, the mass storage device 300 sequentially adds one new data to the operation information database 301, and the operation data Will be stored. The communication unit 401 can refer to the driving information database 301 at any time.

  The operation information database 301 is a relational database, and includes an air conditioner configuration information management table 302 and an operation information management table 303.

  The air conditioner configuration information management table 302 will be described with reference to FIG. The air conditioner configuration information management table 302 is a table for managing configuration information of air conditioners such as the first air conditioner 10 and the second air conditioner 20 connected to the abnormality detection system 3. Data is added or deleted when an air conditioner is newly connected or when the connection configuration of the indoor units and outdoor units constituting the air conditioner is changed. The air conditioner configuration information management table 302 includes an air conditioner ID, a property ID, an indoor unit ID, and an outdoor unit ID field. The air conditioner ID field for specifying an air conditioner such as the first air conditioner 10 and the second air conditioner 20 is stored in the air conditioner ID field. The property ID field stores a property ID that identifies a property such as the first property 110 or 210 in which the air conditioner identified by the air conditioner ID is installed. The indoor unit ID stores an indoor unit ID that identifies an indoor unit such as the indoor units 4 and 5 (see FIG. 6) that constitute the air conditioner identified by the air conditioner ID. The outdoor unit ID stores an outdoor unit ID that specifies an outdoor unit such as the outdoor unit 2 (see FIG. 6) connected to the indoor unit specified by the indoor unit ID.

  Next, the driving information management table 303 will be described with reference to FIG. The operation information management table 303 manages operation data of air conditioners such as the first air conditioner 10 and the second air conditioner 20. The operation data stored in the operation information management table 303 includes operation condition data indicating operation conditions of the air conditioner such as the first air conditioner 10 and the second air conditioner 20, and an air conditioner under the operation condition. Operation state data indicating the operation state is included. The operation information management table 303 includes fields such as date / time, indoor unit ID, start state, operation mode, degree of supercooling, degree of superheat, high pressure, low pressure, outside temperature, room temperature, and compressor speed. In the date / time field, a value indicating the date / time when the operation data is acquired by the LC such as the first LC 100 or the second LC 200 is stored. The indoor unit ID field stores an indoor unit ID that identifies the indoor unit corresponding to the operation data. In the activation state field, a value indicating the activation state of the indoor unit identified by the indoor unit ID ("ON" when the power is on and activated, and when the power is off and not activated) Is stored as “OFF”. In the operation mode field, a value indicating the operation mode of the indoor unit specified by the indoor unit ID ("cooling" when performing cooling operation, "heating" when performing heating operation) is stored. Is done. In the supercooling degree, superheat degree, high pressure, low pressure, outside air temperature, room temperature, and compressor rotation speed fields, the supercooling degree SC of the refrigeration cycle of the refrigerant circuit including the indoor unit specified by the indoor unit ID, superheat Stored are values indicating the degree SH, the high pressure Hp, the low pressure Lp, the outside air temperature Ta, the room temperature Tr, and the compressor speed f.

(Configuration of the first air conditioner)
With reference to FIG. 6, the structure of the 1st air conditioning apparatus 10 is demonstrated.

  The first air conditioner 10 cools or heats the air in the room where the indoor units 4 and 5 of the first air conditioner 10 are installed by performing a vapor compression refrigeration cycle operation. The refrigerant circuit 1 of the first air conditioner 10 includes an outdoor unit 2, a plurality of (in this embodiment, two) indoor units 4 and 5 connected in parallel to the outdoor unit 2, the outdoor unit 2 and the indoor unit A liquid refrigerant communication pipe 6 and a gas refrigerant communication pipe 7 that connect the units 4 and 5 are provided.

[Indoor unit]
The indoor units 4 and 5 are installed by embedding or hanging on the indoor ceiling of the first property 110 or by hanging on the indoor wall surface. The indoor units 4 and 5 are connected to the outdoor unit 2 via a liquid refrigerant communication pipe 6 and a gas refrigerant communication pipe 7. In addition, since the indoor unit 4 and the indoor unit 5 have the same configuration, only the configuration of the indoor unit 4 will be described here, and the configuration of the indoor unit 5 is the 40th number indicating each part of the indoor unit 4. The reference numerals in the 50s are attached instead of the reference numerals, and description of each part is omitted.

  The indoor unit 4 includes an indoor refrigerant circuit 1a (in the indoor unit 5, an indoor refrigerant circuit 1b) and an indoor fan 43. The indoor refrigerant circuit 1 a includes an indoor expansion valve 41 and an indoor heat exchanger 42.

  The indoor expansion valve 41 is an electric expansion valve connected to the liquid side of the indoor heat exchanger 42 in order to adjust the flow rate of the refrigerant flowing in the indoor refrigerant circuit 1a.

  The indoor heat exchanger 42 functions as a refrigerant evaporator during cooling operation to cool indoor air, and functions as a refrigerant condenser during heating operation to heat indoor air.

  The indoor fan 43 can exchange heat between the indoor air and the refrigerant flowing through the indoor heat exchanger 42 by sucking the indoor air into the indoor unit 4 and supplying the air after heat exchange into the room. It is. The indoor fan 43 can change the flow rate of the air supplied to the indoor heat exchanger 42.

  The indoor unit 4 is provided with sensors 44 to 46. The liquid side of the indoor heat exchanger 42 detects the temperature of the refrigerant in the liquid state or the gas-liquid two-phase state (that is, the refrigerant temperature corresponding to the condensing temperature during heating operation or the evaporating temperature during cooling operation). A temperature sensor 44 is provided. A gas side temperature sensor 45 that detects the temperature of the refrigerant in the gas state or the gas-liquid two-phase state is provided on the gas side of the indoor heat exchanger 42. An indoor temperature sensor 46 that detects the temperature of indoor air flowing into the indoor unit 4 (that is, the indoor temperature Tr) is provided on the indoor air inlet side of the indoor unit 4. The liquid side temperature sensor 44, the gas side temperature sensor 45, and the room temperature sensor 46 are thermistors. In addition, the indoor unit 4 includes an indoor side control unit 47 that controls the operation of each unit constituting the indoor unit 4. And the indoor side control part 47 has the microcomputer, memory, etc. which were provided in order to control the indoor unit 4, and is with the remote control (not shown) for operating the indoor unit 4 separately. Control signals and the like are exchanged between them, and control signals and the like are exchanged with the outdoor unit 2.

[Outdoor unit]
The outdoor unit 2 is installed on the roof of the first property 110, and is connected to the indoor units 4 and 5 via the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7.

  The outdoor unit 2 includes an outdoor refrigerant circuit 1 c and an outdoor fan 27. The outdoor refrigerant circuit 1c includes a compressor 21, a four-way switching valve 22, an outdoor heat exchanger 23, an accumulator 24, a liquid side closing valve 25, and a gas side closing valve 26.

  The compressor 21 is a compressor capable of changing the operating capacity, and is a positive displacement compressor driven at a rotational speed f by a motor 21a controlled by an inverter.

  The four-way switching valve 22 is a valve for switching the direction of refrigerant flow. During the cooling operation, the four-way switching valve 22 is in a state indicated by a solid line, and during the heating operation, the four-way switching valve 22 is in a state indicated by a broken line.

  The outdoor heat exchanger 23 functions as a refrigerant condenser during the cooling operation, and functions as a refrigerant evaporator during the heating operation. The outdoor heat exchanger 23 has a gas side connected to the four-way switching valve 22 and a liquid side connected to the liquid refrigerant communication pipe 6.

  The outdoor fan 27 can exchange heat between the outdoor air and the refrigerant flowing through the outdoor heat exchanger 23 by sucking outdoor air into the outdoor unit 2 and discharging the air after heat exchange outside the outdoor unit 2. It is. The outdoor fan 27 can change the flow rate of air supplied to the outdoor heat exchanger 23.

  The accumulator 24 is connected between the four-way switching valve 22 and the compressor 21 and is a container capable of storing surplus refrigerant generated in the refrigerant circuit 1 according to the operating load of the indoor units 4 and 5. is there.

  The liquid side shutoff valve 25 and the gas side shutoff valve 26 are valves provided at connection ports with the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7. The liquid side closing valve 25 is connected to the outdoor heat exchanger 23. The gas side closing valve 26 is connected to the four-way switching valve 22.

  The outdoor unit 2 is provided with sensors 28 to 35. Specifically, the outdoor unit 2 includes a suction pressure sensor 28 that detects the suction pressure (ie, the low pressure Lp) of the compressor 21 and a discharge that detects the discharge pressure (ie, the high pressure Hp) of the compressor 21. A pressure sensor 29, a suction temperature sensor 32 that detects the suction temperature of the compressor 21, and a discharge temperature sensor 33 that detects the discharge temperature of the compressor 21 are provided. The suction temperature sensor 32 is provided on the inlet side of the accumulator 24. The outdoor heat exchanger 23 includes a heat exchanger temperature sensor 30 that detects the temperature of the refrigerant flowing in the outdoor heat exchanger 23 (that is, the refrigerant temperature corresponding to the condensation temperature during the cooling operation or the evaporation temperature during the heating operation). Is provided. On the liquid side of the outdoor heat exchanger 23, a liquid side temperature sensor 31 that detects the temperature of the refrigerant in the liquid state or the gas-liquid two-phase state is provided. A gas side temperature sensor 35 that detects the temperature of the refrigerant in the gas state or the gas-liquid two-phase state is provided on the gas side of the outdoor heat exchanger 23. An outdoor air temperature sensor 34 that detects the temperature of the outdoor air flowing into the outdoor unit 2 (that is, the outdoor air temperature Ta) is provided on the outdoor air inlet side of the outdoor unit 2. The outdoor unit 2 includes an outdoor control unit 36 that controls the operation of each unit constituting the outdoor unit 2. The outdoor control unit 36 includes a microcomputer provided for controlling the outdoor unit 2, a memory, an inverter circuit for controlling the motor 21a, and the like. Control signals and the like are exchanged between 47 and 57.

  The control unit 8 includes indoor side control units 47 and 57 and an outdoor side control unit 36. The control unit 8 receives detection signals from the various sensors 28 to 35, 44 to 46, and 54 to 56, and controls various devices and valves 21, 22, 41, and 51 based on these detection signals and the like. Moreover, the control part 8 is connected to 1st LC100, and 1st LC100 acquires the detection signal of various sensors 28-35, 44-46, 54-56 as driving | running state data.

[Operation of the first air conditioner]
Next, the operation mode of the 1st air conditioning apparatus 10 is demonstrated. The operation mode of the first air conditioner 10 includes a cooling operation mode and a heating operation mode.

  During the cooling operation, the four-way switching valve 22 is in the state shown by the solid line in FIG. 4, that is, the discharge side of the compressor 21 is connected to the gas side of the outdoor heat exchanger 23, and the suction side of the compressor 21 is the indoor heat. It will be in the state connected to the gas side of the exchangers 42 and 52. FIG. Further, the liquid side closing valve 25 and the gas side closing valve 26 are opened, and the opening degrees of the indoor expansion valves 41 and 51 are adjusted so that the superheat degree SH of the refrigerant at the outlets of the indoor heat exchangers 42 and 52 becomes a predetermined value. It has come to be. The superheat degree SH of the refrigerant at the outlets of the indoor heat exchangers 42 and 52 is obtained by subtracting the refrigerant temperature value detected by the liquid side temperature sensors 44 and 54 from the refrigerant temperature value detected by the gas side temperature sensors 45 and 55. The suction pressure of the compressor 21 detected or detected by the suction pressure sensor 28 is converted into a saturation temperature value corresponding to the evaporation temperature, and the refrigerant temperature value detected by the gas side temperature sensors 45 and 55 It is detected by subtracting the saturation temperature value of the refrigerant. The refrigerant subcooling degree SC at the outlet of the outdoor heat exchanger 23 is detected by the liquid side temperature sensor 31 by converting the discharge pressure of the compressor 21 detected by the discharge pressure sensor 29 into a saturation temperature value with respect to the condensation temperature. It is detected by subtracting the saturation temperature value of the refrigerant from the refrigerant temperature value.

  When the compressor 21, the outdoor fan 27, and the indoor fans 43 and 53 are started in the state of the refrigerant circuit 1, the low-pressure Lp gas refrigerant is sucked into the compressor 21 and compressed to become a high-pressure Hp gas refrigerant. . Thereafter, the gas refrigerant having the high pressure Hp is sent to the outdoor heat exchanger 23 via the four-way switching valve 22 and is condensed by exchanging heat with the outdoor air supplied by the outdoor fan 27. It becomes a liquid refrigerant.

  Then, the liquid refrigerant having the high pressure Hp is sent to the indoor units 4 and 5 via the liquid side closing valve 25 and the liquid refrigerant communication pipe 6.

  The liquid refrigerant at the high pressure Hp sent to the indoor units 4 and 5 is reduced in pressure by the indoor expansion valves 41 and 51 to become a gas-liquid two-phase refrigerant at the low pressure Lp and sent to the indoor heat exchangers 42 and 52. Then, heat is exchanged with the indoor air in the indoor heat exchangers 42 and 52 to evaporate to become a gas refrigerant having a low pressure Lp. Here, the indoor expansion valves 41 and 51 control the flow rate of the refrigerant flowing in the indoor heat exchangers 42 and 52 so that the degree of superheat SH at the outlets of the indoor heat exchangers 42 and 52 becomes a predetermined value. The gas refrigerant having the low pressure Lp evaporated in the indoor heat exchangers 42 and 52 has a predetermined superheat degree SH. Thus, the refrigerant | coolant of the flow volume according to the driving | running load requested | required in each indoor heat exchanger 42 and 52 in the air conditioned space in which each indoor unit 4 and 5 was installed is flowing.

  The gas refrigerant having the low pressure Lp is sent to the outdoor unit 2 via the gas refrigerant communication pipe 7 and flows into the accumulator 24 via the gas side closing valve 26 and the four-way switching valve 22. Then, the gas refrigerant having the low pressure Lp flowing into the accumulator 24 is sucked into the compressor 21 again. Here, depending on the operating load of the indoor units 4 and 5, for example, when the operating load of one of the indoor units 4 and 5 is small or stopped, or the operating load of both the indoor units 4 and 5 is When a surplus refrigerant amount is generated in the refrigerant circuit 1 as in the case where the refrigerant is small, the surplus refrigerant is accumulated in the accumulator 24.

  On the other hand, during the heating operation, the four-way switching valve 22 is in the state indicated by the broken line in FIG. 4, that is, the discharge side of the compressor 21 is connected to the gas side of the indoor heat exchanger 52 and the suction side of the compressor 21 is It will be in the state connected to the gas side of the outdoor heat exchanger 23. FIG. Further, the liquid side closing valve 25 and the gas side closing valve 26 are opened, and the indoor expansion valves 41 and 51 are opened so that the refrigerant subcooling degree SC at the outlets of the indoor heat exchangers 42 and 52 becomes a predetermined value. It has come to be adjusted. The refrigerant supercooling degree SC at the outlets of the indoor heat exchangers 42 and 52 converts the discharge pressure of the compressor 21 detected by the discharge pressure sensor 29 into a saturation temperature value with respect to the condensation temperature, and the liquid side temperature sensors 44 and 54. This is detected by subtracting the saturation temperature value of the refrigerant from the refrigerant temperature value detected by the above. Whether the refrigerant superheat degree SH at the outlet of the outdoor heat exchanger 23 is detected by subtracting the refrigerant temperature value detected by the liquid side temperature sensor 31 from the refrigerant temperature value detected by the gas side temperature sensor 35. Alternatively, the suction pressure of the compressor 21 detected by the suction pressure sensor 28 is converted into a saturation temperature value corresponding to the evaporation temperature, and the saturation temperature value of this refrigerant is calculated from the refrigerant temperature value detected by the gas side temperature sensor 35. Detected by subtracting.

  When the compressor 21, the outdoor fan 27, and the indoor fans 43 and 53 are started in the state of the refrigerant circuit 1, the low-pressure Lp gas refrigerant is sucked into the compressor 21 and compressed to become a high-pressure Hp gas refrigerant. The four-way switching valve 22, the gas side closing valve 26 and the gas refrigerant communication pipe 7 are sent to the indoor units 4 and 5.

  And after the gas refrigerant of the high pressure Hp sent to the indoor units 4 and 5 is condensed by performing heat exchange with the indoor air in the indoor heat exchangers 42 and 52, the liquid refrigerant of the high pressure Hp is obtained. The refrigerant is decompressed by the indoor expansion valves 41 and 51 to become a gas-liquid two-phase refrigerant having a low pressure Lp. Here, the indoor expansion valves 41 and 51 control the flow rate of the refrigerant flowing in the indoor heat exchangers 42 and 52 so that the degree of supercooling SC at the outlets of the indoor heat exchangers 42 and 52 becomes a predetermined value. Therefore, the liquid refrigerant having the high pressure Hp condensed in the indoor heat exchangers 42 and 52 has a predetermined supercooling degree SC. Thus, the refrigerant | coolant of the flow volume according to the driving | running load requested | required in each indoor heat exchanger 42 and 52 in the air conditioned space in which each indoor unit 4 and 5 was installed is flowing.

  The refrigerant in the gas-liquid two-phase state at the low pressure Lp is sent to the outdoor unit 2 via the liquid refrigerant communication pipe 6 and flows into the outdoor heat exchanger 23 via the liquid side closing valve 25. Then, the refrigerant in the gas-liquid two-phase state having the low pressure Lp flowing into the outdoor heat exchanger 23 is condensed by performing heat exchange with the outdoor air supplied by the outdoor fan 27, and becomes a gas refrigerant having the low pressure Lp. It flows into the accumulator 24 via the path switching valve 22. Then, the gas refrigerant having the low pressure Lp flowing into the accumulator 24 is sucked into the compressor 21 again. Here, depending on the operating load of the indoor units 4 and 5, for example, when the operating load of one of the indoor units 4 and 5 is small or stopped, or the operating load of both the indoor units 4 and 5 is When a surplus refrigerant amount is generated in the refrigerant circuit 1 as in the case where the refrigerant is small, the surplus refrigerant is accumulated in the accumulator 24 as in the cooling operation.

(Configuration of second air conditioner)
The configuration of the second air conditioner is the same as the configuration of the first air conditioner. Moreover, the apparatus which comprises a 2nd air conditioning apparatus has the same model number as the apparatus which comprises the 1st air conditioning apparatus corresponding to each apparatus. Furthermore, the 1st property 110 in which the 1st air conditioning apparatus 10 was installed, and the 2nd property 210 in which the 2nd air conditioning apparatus 20 was installed exist in the vicinity, and environmental conditions, such as external temperature, are also substantially equal. As described above, the first air conditioner 10 and the second air conditioner 20 are similar in configuration and exist under similar environmental conditions.

(Abnormality detection operation in the first air conditioner)
Next, an operation in which the abnormality detection system 3 detects an abnormality in the first air conditioner 10 will be described.

  First, consider immediately after installing the first air conditioner 10 in the first property 110 and starting to use the first air conditioner 10. With the start of use of the first air conditioner 10, the first LC 100 also starts to operate, and continuously acquires operation data of the first air conditioner 10 from the first air conditioner 10. The first LC 100 is a daily report data once a day, the operation data of the first air conditioner 10 for one day, the data indicating the date and time when the operation data was acquired, and the data indicating the operation mode of the first air conditioner 10. The data representing the ID of the first air conditioning apparatus 10 that is the detection target is transmitted to the remote management computer 400 in the remote management center 60 via the Internet line 70.

  When the communication unit 401 of the remote management computer 400 sends the operation data from the first LC 100 to the large-capacity storage device 300, the operation data is sequentially stored as new data in the operation information database 301 of the large-capacity storage device 300. Go.

  The remote management computer 400 performs an abnormality detection operation in the first air conditioning apparatus 10 as appropriate.

[Abnormality detection operation in the first air conditioner by a remote management computer]
Hereinafter, the operation when the remote management computer 400 detects an abnormality in the first air conditioner 10 will be described with reference to FIG. 7. Hereinafter, although the refrigerant leak detection in the 1st air conditioning apparatus 10 is demonstrated as an example, it is not limited to this, The following refrigerant leak detection operation | movement is utilized also for abnormality detection other than a refrigerant leak detection.

  In the following description, the use of the second air conditioner 20 has started long before the use of the first air conditioner 10 has started, and the use of the first air conditioner 10 has started. In the driving information database 301, it is assumed that past driving data corresponding to various driving conditions is sufficiently stored.

  In step S <b> 21, the communication unit 408 receives daily report data including operation data for one day of the first air conditioner 10 from the first LC 100 via the Internet line 70. The operation data includes operation condition data and operation state data. The operating condition data of the first air conditioner 10 includes data relating to the activation state, operation mode, outside air temperature, and room temperature of the indoor units that constitute the first air conditioner 10. The operating state data of the first air conditioner 10 includes the supercooling degree SC, the superheat degree SH, the high pressure Hp, the low pressure Lp, the outside air temperature Ta, the indoor temperature Tr, and the compressor of the refrigeration cycle of the first air conditioner 10. Data on the rotational speed f is included.

  Next, in step S <b> 22, the CPU 405 selects the steady state driving state data from the driving state data included in the daily report data according to the control program stored in the HD 407. Details of the method for selecting the steady state operating state data in step S22 will be described later with reference to FIG.

Next, in step S23, the CPU 405 groups the steady-state operating state data selected in step S22 according to the control program stored in the HD 407 for each operating state data having the same operating conditions. However, if the number of operating state data belonging is less than N, the group is discarded. Here, these groups, _{G 1,} G 2, and · · ·, z number of groups _G j to _{G z (j = 1,2, ···} , z) and the order number belonging operation status data is large The number of operating state data belonging to the group G _j is n (j) (n (j) ≧ N). Further, the CPU 405 further sets the supercooling degree SC of one set of refrigeration cycles from n (j) operation state data belonging to the group G _j for each of the groups G _j (j = 1, 2,..., Z). , N (j) state quantity data sets each including a superheat degree SH, a high pressure Hp, a low pressure Lp, an outside air temperature Ta, an indoor temperature Tr, and a compressor speed f are prepared and stored in the memory 406.

  In the case of the first air conditioner 10, “the operation conditions of the operation state data are equal” means that the first air conditioner 10 when the operation state data of the first air conditioner 10 is acquired by the first LC 100. It means that the operating conditions are equal. In particular, in step S23, it means that the activation state of the indoor unit is equal, the operation mode is equal, and the values of the outside air temperature and the room temperature are equal to or greater than the decimal point. The same applies to air conditioners other than the first air conditioner 10.

  Next, in step S24, the CPU 405 refers to the operation information database 301 in the large-capacity storage device 300 according to the control program stored in the HD 407, and the operation data during the initial operation of the first air conditioner 10 (hereinafter referred to as “the operation information database 301”). Take out the initial operation data. Further, the CPU 405 selects the steady state operation state data from the operation state data included in the initial operation data. Details of the steady state operation state data selection method in step S24 will be described later with reference to FIG.

Next, in step S25, the CPU 405 sorts in step S24 each of the groups G _j (j = 1, 2,..., Z) grouped in step S23 according to the control program stored in the HD 407. It is checked whether or not there are m pieces of data having the same operating conditions as the operating state data belonging to the group G _j in the operating state data in the steady state. G ₁ , G ₂ ,..., G _z are examined in this order. When m groups G _j are found, the process proceeds to step S26. At this time, j = J1. On the other hand, if there is no m group G _j after checking up to G _z , the process proceeds to step S27. At this time, m ′ _j (0 ≦ m ′ _j <m) pieces of data having the same operation conditions as the operation state data belonging to the group G _j exist in the operation state data in the steady state selected in step S24. Further, it is assumed that when j = J2, the value of m ′ _j (j = 1, 2,..., Z) is maximized.

In step S26, in accordance with the control program stored in the HD 407, the CPU 405 operates with the operation state data and the operation belonging to the group G _J1 confirmed to exist in step S25 among the initial operation data in the steady state of the first air conditioner 10. Select m operating state data with the same conditions, and from the m operating state data, the supercooling degree SC, superheat degree SH, high pressure Hp, low pressure Lp, outside air temperature Ta, indoor temperature Tr of one set of refrigeration cycle Then, m state quantity data sets composed of the compressor speed f are prepared, stored in the memory 406 as comparison target data of the n (J1) state quantity data sets prepared in step S23, and the process proceeds to step S28.

In step S27, the CPU 405 operates according to the control program stored in the HD 407, among the initial operation data in the steady state of the first air conditioner 10, the operation state data and the operation belonging to the group G _J2 confirmed to exist in step S25. Select m ′ _J2 (0 ≦ m ′ _J2 <m) operation state data having the same condition. Further, the CPU 405 is the initial operation data of the second air conditioner 20 similar to the first air conditioner 10, and is in the steady state and has the same operation condition as the operation state data belonging to the group G _J2 m−m ′ _J2. Select individual operating state data. Therefore, a total of m pieces of operation state data are selected from the initial operation data of the first air conditioner 10 and the second air conditioner 20. Subsequently, the CPU 405 determines the supercooling degree SC, the superheat degree SH, the high pressure Hp, the low pressure Lp, the outside air temperature Ta, the room temperature Tr, and the compressor rotation of a set of refrigeration cycles from the selected m operating state data. M state quantity data sets having a number f are prepared and stored in the memory 406 as comparison target data of the n (J2) state quantity data sets prepared in step S23. Details of the steady state operation state data selection method in step S27 will be described later with reference to FIG.

  In step S28, the CPU 405 determines n Mahalanobis for each of the n state quantity data sets based on the comparison target data stored in the memory 406 in step S26 or step S27 according to the control program stored in the HD 407. Calculate the distance. Note that the value of n is n (J1) when it reaches step S28 via step S26, and n (J2) when it reaches step S28 via step S27.

The Mahalanobis distance D _k (k = 1,..., N) of each state quantity data set is calculated by the following equation.

D _k ² = (X _k −μ) ^T Σ ⁻¹ (X _k −μ) (k = 1,..., N)
However, _{X k} are, _SC 1 the degree of subcooling of the refrigeration cycle of the n first air conditioner _{10, SC 2, ···, SC n} , the degree of superheat _{SH 1, SH 2, ···,} SH _{n, Hp} 1 a high _{pressure, Hp 2, ···, Hp n} , Lp 1 and low _{pressure, Lp 2, ···, Lp n} , the outside air temperature _{Ta 1, Ta 2, ···,} Ta n, the room temperature _{Tr 1, Tr 2, ···,} Tr n, the compressor rotational speed _{f 1, f 2, ···,} when the _{f n,
X k = (SC k, SH} k, Hp k, Lp k, Ta k, Tr k, f k) (k = 1, ···, n)
Is an observation matrix with 7 rows and 1 column,
μ is a supercooling degree data group (SC ₁ , SC ₂ ,..., SC _m ) and superheat degree data group (SH ₁ , SH ₂ ) of the refrigeration cycle of the first air conditioner 10 each having m elements. , ···, _SH m), high pressure data group _{(Hp 1, Hp 2, ···} , Hp m), the low pressure data group _{(Lp 1, Lp 2, ···} , Lp m), outside air temperature data group _{(Ta 1, Ta 2, ···} , Ta m), indoor temperature data group _{(Tr 1, Tr 2, ···} , Tr m), compressor speed data group _{(f 1,} f _2, ·· .., F _m ), it is a 7 × 1 average value matrix having the average values of these seven data groups as components,
(X _k −μ) ^T is a transposed matrix of (X _k −μ),
Σ is a supercooling degree data group (SC ₁ , SC ₂ ,..., SC _m ) and superheat degree data group (SH ₁ , SH ₂ ) of the refrigeration cycle of the first air conditioner 10 each having m elements. , ···, _SH m), high pressure data group _{(Hp 1, Hp 2, ···} , Hp m), the low pressure data group _{(Lp 1, Lp 2, ···} , Lp m), outside air temperature data group _{(Ta 1, Ta 2, ···} , Ta m), indoor temperature data group _{(Tr 1, Tr 2, ···} , Tr m), compressor speed data group _{(f 1,} f _2, ·· ., F _m ) of 7 rows and 7 columns.

Next, in step S29, the CPU 405 determines each of the n Mahalanobis distances D _k (k = 1,..., N) calculated in step S28 as a predetermined value according to the control program stored in the HD 407. Compare. The CPU 405 determines that the refrigerant has leaked if the Mahalanobis distance D _k (k = 1,..., N) calculated in step S28 is greater than or equal to 1% if greater than a predetermined value, If less than 1% is greater than the predetermined value, it is determined that the refrigerant has not leaked. If it is determined that the refrigerant is leaking, the process proceeds to step S30. If it is not determined that the refrigerant is leaking, the flow ends.

  In step S <b> 30, the display unit 404 displays the determination result and notifies a serviceman of the remote management center 60 that the refrigerant has leaked in the first air conditioner 10.

[Method for selecting operating state data in steady state]
In the above steps S22, S24, and S27, the CPU 405 classifies each operation data included in the daily report data and the initial operation data into the steady state or the transient state according to the control program stored in the HD 407, so that the steady state operation data is obtained. Sort out.

  Hereinafter, a method in which the CPU 405 classifies each operation state data of the x operation state data included in the daily report data into a steady state or a transient state will be described with reference to FIG.

In step S31, the CPU 405 determines the degree of supercooling SC, the degree of superheating SH, the high pressure Hp included in the operation state data at time t _i (i = 1, 2,..., X) defined at 5 second intervals. A change rate value data set V _i (i = 1, 2,..., X) composed of change rate values of the low pressure Lp, the outside air temperature Ta, the room temperature Tr, and the compressor speed f is calculated. The operation state data is data acquired from the first air conditioner 10 by the first LC 100 at intervals of 5 seconds. That is, the x operation state data includes a time t _i (i = i = 5 seconds). 1, 2,..., X) a state consisting of a set of supercooling degree SC, superheating degree SH, high pressure Hp, low pressure Lp, outside air temperature Ta, room temperature Tr, and compressor speed f. X sets of quantity data sets are included. Supercooling degree SC at time _{t i,} the degree of superheat SH, high pressure Hp, low pressure Lp, the outside air temperature Ta, the room temperature Tr, respective compressor speed _{f SC (t i), SH} (t i), Hp ( Let t _i ), Lp (t _i ), Ta (t _i ), Tr (t _i ), and f (t _i ), the change rate value data set V _i (i = 1, 2,...) at time t _i .・, X)
V _i = {SC (t _i ) −SC (t _i−12 ),
SH (t _i ) -SH (t _i-12 ),
Hp (t _i ) -Hp (t _i-12 ),
Lp (t _i ) −Lp (t _i−12 ),
_{Ta (t i) -Ta (t} i-12),
Tr (t _i ) -Tr (t _i-12 ),
f (t _i ) −f (t _i−12 )}
It is expressed. That is, the change rate value of the operation state data at time t _i, the time t _i-12 from the state of time t _{i (i.e.,} 60 seconds before the time t _i) is calculated as a value obtained by subtracting the state of. Therefore, the change rate value of the driving state data is defined by the amount of change in the state amount for one minute.

In step S32, the CPU 405 compares the absolute value of each element of the change rate value data set V _i (i = 1, 2,..., X) calculated in step S31 with a predetermined value. The predetermined values are individually set for the supercooling degree SC, the superheating degree SH, the high pressure Hp, the low pressure Lp, the outside air temperature Ta, the indoor temperature Tr, and the compressor speed f, and the change rate value. Absolute values of seven elements of data set V _i | SC (t _i ) −SC (t _i−12 ) |, | SH (t _i ) −SH (t _i−12 ) |, | Hp (t _i ) − Hp (t _i-12 ) |, | Lp (t _i ) −Lp (t _i−12 ) |, | Ta (t _i ) −Ta (t _i−12 ) |, | Tr (t _i ) −Tr ( _{t i-12) |, |} f (t i) -f (t i-12) | respectively are magnitude compared separately. CPU405, if all the absolute values of the seven elements of the change rate value data sets V _i is smaller than a predetermined value corresponding, in the operating state data (time t _i corresponding to the change rate value data set V _i State quantity data set {including SC (t _i ), SH (t _i ), Hp (t _i ), Lp (t _i ), Ta (t _i ), Tr (t _i ), f (t _i )} Is classified as steady state. On the other hand, if at least one of the absolute values of the seven elements of change rate values dataset V _i greater than a predetermined value corresponding, in the operating state data (time t _i corresponding to the change rate value data set V _i State quantity data set {including SC (t _i ), SH (t _i ), Hp (t _i ), Lp (t _i ), Ta (t _i ), Tr (t _i ), f (t _i )} Is classified as a transient state.

  Steps S31 and S32 are repeated x times for the x operating state data, and the x operating state data are classified into a steady state or a transient state.

  A method in which the CPU 405 classifies each operation state data included in the initial operation data into a steady state or a transient state is the same as the method shown in the flowchart of FIG.

(Abnormality detection operation in the second air conditioner)
The abnormality detection operation in the second air conditioning apparatus 20 is the same as the abnormality detection operation in the first air conditioning apparatus 10.

(Characteristic)
(1)
In the above-described embodiment, the abnormality detection in the first air conditioner 10 is performed by comparing operation state data with the same operation condition using the operation condition data of the first air conditioner 10. The same applies to abnormality detection in air conditioners other than the first air conditioner 10. Thereby, it is possible to detect an abnormality in the air conditioner in consideration of the operating conditions, and the accuracy of abnormality detection is improved.

(2)
In the above embodiment, the abnormality detection in the first air conditioner 10 classifies the operation state data into the steady state and the transient state using the change rate value of the operation state data of the first air conditioner 10, and the steady state This is done by comparing the operating state data of the two. The same applies to abnormality detection in air conditioners other than the first air conditioner 10. Thereby, abnormality detection can be performed in consideration of the difference in characteristics between the steady state and the transient state, and the accuracy of abnormality detection is improved.

(3)
In the above-described embodiment, the abnormality detection in the first air conditioner 10 is performed by using the first air conditioner 10 or the second air condition similar to the first air conditioner 10 as the current operating state data of the first air conditioner 10. This is done by comparing with the past operating state data of the device 20. Thereby, even when the amount of past operation state data of the first air conditioner is insufficient, it is possible to detect an abnormality in consideration of the characteristics of the individual air conditioners. The same applies to abnormality detection in air conditioners other than the first air conditioner 10.

(4)
In the above embodiment, the abnormality detection in the first air conditioning apparatus 10 is mainly performed by the remote management computer 400 in the remote management center 60. That is, the first local controller 100 in the first property 110 that is the same as the first air conditioner 10 only needs to acquire and transmit the operation state data from the first air conditioner 10 to detect an abnormality. The main process is performed by the remote management computer 400. The same applies to abnormality detection in air conditioners other than the first air conditioner 10. As a result, it becomes relatively easy to perform data mining that requires high calculation ability for a huge amount of past driving state data included in the driving information database 301, and anomaly detection with higher accuracy than before. Is possible.

(5)
Recently, equipment such as air conditioners are often managed by remote management centers that are remote via the Internet line, etc., and local controllers are installed in the properties where air conditioners are installed. There are many. Such a local controller manages the operation of the air conditioner and periodically acquires the operation data of the air conditioner for remote management and transmits it to the remote management computer of the remote management center. In such a case, when the abnormality detection system 3 is introduced, it is possible to use existing equipment, minimize newly introduced equipment, and reduce the burden on the cost of the user or service provider. be able to. Further, in this abnormality detection system 3, the remote management computer 400, which is a detection device, exists remotely from the property, so that it is not necessary for the service person to go to the site for the operation of the detection device. Etc. can be further reduced.

<Modification>
(1)
In the above-described embodiment, the change rate value of the driving state data is defined as the amount of change in the state amount for one minute, but may be defined as the amount of change in the state amount in an arbitrary time interval. Moreover, although driving | running state data are acquired from the 1st air conditioning apparatus 10 by 1st LC100 at 5 second intervals, you may acquire at arbitrary time intervals. The same applies to air conditioners other than the first air conditioner 10.

(2)
In the above embodiment, operating state data having the same operating conditions are selected, but at least a part of the operating conditions may match, that is, operating state data having similar operating conditions may be selected. In this case, a cluster analysis or the like is performed on the driving condition data to calculate the similarity between the driving condition data. When the similarity between the driving condition data is larger than a predetermined value, it is determined that the driving conditions are similar. Also good. Since the amount of operation state data having similar operation conditions can be considerably larger than that of operation state data having the same operation conditions, a large amount of sample data that can be used for the abnormality detection operation by the remote management computer 400 can be obtained. This improves the accuracy of abnormality detection.

(3)
In the above embodiment, the calculation of the change rate value of the operation state data is performed when the remote management computer 400 performs the abnormality detection operation, but the remote management computer 400 receives the operation state data from the first LC 100. It may be done at the time. In this case, a data field for storing each element of the change rate value data set V _i is prepared in the operation information database 301 of the large-capacity storage device 300, and the change occurs when the operation state data is stored in the operation information database 301. each element of the rate value data set V _i also storing as well. In this case, when the remote management computer 400 performs the abnormality detection operation, it is not necessary to refer to the previous operation state data, and the abnormality detection operation of the remote management computer 400 can be speeded up. The same applies to abnormality detection in air conditioners other than the first air conditioner 10.

(4)
In the above-described embodiment, the abnormality detection in the first air conditioner 10 is performed by the remote management computer 400 in the remote management center 60, but is performed in the first property 110 where the first air conditioner 10 exists. It may be broken. In this case, for example, a service person travels to the first property 110 with a notebook computer equipped with a program for detecting an abnormality according to the flowcharts of FIGS. 7 and 8, and the first air in the first property 110. An abnormality in the first air conditioner 10 may be detected by connecting to the first LC that manages the conditioner 10 and further connecting to the mass storage device 300 that is remote via the Internet line 70. The same applies to abnormality detection in air conditioners other than the first air conditioner 10.

(5)
In the above embodiment, the refrigerant leakage detection in the first air conditioner 10 is performed by detecting the supercooling degree SC, the superheat degree SH, the low pressure Lp, the high pressure Hp, the outside air temperature Ta, the indoor temperature of the refrigeration cycle of the first air conditioner 10. Although the temperature Tr and the compressor speed f are used, the refrigerant leakage is detected using various state quantities obtained from the detection signals of the various sensors 28 to 35, 44 to 46, and 54 to 56. Also good. Moreover, the flowchart shown by FIG.7 and FIG.8 can be utilized also for abnormality detection other than refrigerant | coolant leak detection. Also in this case, abnormality detection is performed using appropriate various state quantities obtained from the detection signals of the various sensors 28-35, 44-46, 54-56. The same applies to abnormality detection in air conditioners other than the first air conditioner 10.

(6)
In the above embodiment, the abnormality detection in the first air conditioner 10 is performed by Mahalanobis distance calculation according to step S26 in FIG. 7, but other data mining methods such as multiple regression analysis and cluster analysis may be used. Good. The same applies to abnormality detection in air conditioners other than the first air conditioner 10.

(7)
The first LC 100 may perform part of the abnormality detection operation in the first air conditioning apparatus 10 performed by the remote management computer 400 in the above embodiment. That is, the remote management computer 400 performs a process with a relatively large calculation load, and the first LC 100 performs a process with a relatively small calculation load. For example, the remote management computer 400 only calculates the variance-covariance matrix and the mean value matrix in step S28, and the first LC 100 performs other processes in the flowchart of FIG. The remote management computer 400 calculates the variance covariance matrix and the mean value matrix before the first LC 100 performs processing other than the calculation of the variance covariance matrix and the mean value matrix, and transmits the computation results to the first LC 100. deep. In this case, the abnormality detection system 3 can detect an abnormality in the first air conditioner 10 even when the remote management computer 400 is disconnected from the first air conditioner 10 due to a network failure or the like. The same applies to abnormality detection in air conditioners other than the first air conditioner 10.

  The present invention has an effect that an abnormality in an air conditioner can be detected in consideration of operating conditions, and is useful as an abnormality detection system for an air conditioner.

The figure which shows the structure of the abnormality detection system which concerns on one Embodiment of this invention. The figure which shows the structure of a 1st local controller. The figure which shows the structure of the computer for remote management. The figure which shows an air conditioning apparatus structure information management table. The figure which shows a driving | operation information management table. The refrigerant circuit figure of the air conditioning apparatus which concerns on one Embodiment of this invention. The flowchart which shows the operation | movement which the computer for remote management detects abnormality in a 1st air conditioning apparatus. The flowchart which shows the method of classifying the driving | running state data of a steady state.

3 Anomaly Detection System 10 First Air Conditioner 20 Second Air Conditioner 70 Internet Line 100 First Local Controller 110 First Property 200 Second Local Controller 210 Second Property 300 Mass Storage Device 400 Remote Management Computer

Claims (5)

The first air conditioner (1 0) the first air conditioner (1 0) under the first operating condition data and the operating condition indicating the operating conditions of the first acquisition unit for acquiring first operation status data of the (10 0 )
A second acquisition device (200) for acquiring second operating condition data indicating operating conditions of the second air conditioner (20) and second operating state data of the second air conditioner (20) under the operating conditions. )When,
The first operating condition data, the first operating state data, the second operating condition data, and the second operating state data acquired by the first acquiring device (10 0 ) and the second acquiring device (200). A storage device (300) for storing;
The current first operating state data acquired by the first acquiring device (10 0 ) is stored in the storage device (300) when the first operating state data is sufficiently stored. the first compared to at least partially be equal accumulate the in the storage unit (300) and past the first operating state data of the operating condition and the operation state data of the storage device (300) the first in When the driving state data is not sufficiently stored, the past second driving state data stored in the storage device (300) in which at least a part of the driving conditions is equal to the current first driving state data. at least in part by comparing the comparison data including, the first air conditioner (1 0) test known device you detect an abnormality in the (400),
An abnormality detection system (3) comprising: The operating conditions are the activation state of the indoor units (4, 5) constituting the first air conditioner (1 0 ) and the second air conditioner (20), and the operation mode of the indoor units (4, 5). , Relating to at least one of outdoor temperature and room temperature,
The abnormality detection system (3) according to claim 1 . The first acquisition device (10 0 ) is a device that manages the first air conditioner (1 0 ) in a first property (11 0 ) where the first air conditioner (1 0 ) is installed. ,
The second acquisition device (200) is a device that manages the second air conditioner (20) in a second property (210) where the second air conditioner (20) is installed,
The storage device (300) and the detection device (400) are remote from the first property (11 0 ) and the second property (210) , and the first acquisition device (10 0 ) and the second acquisition Connected to the device (200) via the Internet line (70), private line or telephone line,
The abnormality detection system (3) according to claim 1 or 2 . The detection device (400) detects refrigerant leakage in the first air conditioner (1 0 ).
The abnormality detection system (3) according to any one of claims 1 to 3 . The first operating state data and the second operating state data are the subcooling degree, superheat degree, low pressure pressure, and high pressure of the refrigeration cycle of the first air conditioner (1 0 ) and the second air conditioner (20). Regarding at least one of pressure, outside air temperature, room temperature and compressor speed,
The abnormality detection system (3) according to any one of claims 1 to 4 .

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