WO2021166020A1 - Système de climatisation, dispositif de gestion de fonctionnement et programme - Google Patents

Système de climatisation, dispositif de gestion de fonctionnement et programme Download PDF

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Publication number
WO2021166020A1
WO2021166020A1 PCT/JP2020/005983 JP2020005983W WO2021166020A1 WO 2021166020 A1 WO2021166020 A1 WO 2021166020A1 JP 2020005983 W JP2020005983 W JP 2020005983W WO 2021166020 A1 WO2021166020 A1 WO 2021166020A1
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Prior art keywords
compressor
abnormality
estimated
control unit
current value
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PCT/JP2020/005983
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English (en)
Japanese (ja)
Inventor
隼人 森
安田　源
亮祐 大畑
幹人 徳地
Original Assignee
日立ジョンソンコントロールズ空調株式会社
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Priority to JP2021536815A priority Critical patent/JP6990803B2/ja
Priority to PCT/JP2020/005983 priority patent/WO2021166020A1/fr
Publication of WO2021166020A1 publication Critical patent/WO2021166020A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/38—Failure diagnosis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states

Definitions

  • the present invention relates to an air conditioning system, an operation management method and a program.
  • air conditioning equipment inevitably wears components due to operating time and deteriorates over time. As a result, when a sudden failure occurs, interpersonal air conditioning may cause heat stroke in the summer.
  • air conditioners for factory equipment and air conditioners for data centers may affect the operating conditions of factories and the stable operation of data centers.
  • Patent Document 1 discloses a method of detecting an abnormality by setting a predetermined first threshold value and a second threshold value for the discharge temperature or discharge pressure of the compressor.
  • the present invention has been made in view of the above points, and an object of the present invention is to accurately evaluate the deterioration of the compressor without requiring the efficiency coefficient of the compressor and the physical characteristics of the refrigerant.
  • the present invention is an air conditioning system including a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger, wherein the current value or power value, the refrigerant suction pressure, and the refrigerant discharge in the compressor are provided.
  • An estimation that estimates the current value or power value of the compressor from the acquisition unit that acquires the pressure, the refrigerant discharge temperature, and the rotation speed, and the time change of the refrigerant suction pressure, the refrigerant discharge pressure, the refrigerant discharge temperature, and the rotation speed.
  • Another embodiment of the present invention is an operation management method executed by an air conditioning system including a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger, and is a current value in the compressor.
  • the compressor From the acquisition step of acquiring the power value, the refrigerant suction pressure, the refrigerant discharge pressure, the refrigerant discharge temperature and the rotation speed, and the time change of the refrigerant suction pressure, the refrigerant discharge pressure and the refrigerant discharge temperature and the rotation speed, the compressor
  • the relationship between the estimation step for estimating the current value or the power value, the estimated current value estimated in the estimation step, and the time change of the actual current value acquired in the acquisition step, or the estimated power value estimated in the estimation step. Includes an output step that outputs information on the deterioration of the compressor based on the time change of the actual power value acquired in the acquisition step.
  • a computer of an air conditioning system including a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger is provided with a current value or a power value in the compressor, and a refrigerant suction.
  • the current value or power value of the compressor is obtained from the acquisition unit that acquires the pressure, the refrigerant discharge pressure, the refrigerant discharge temperature, and the rotation speed, and the time change of the refrigerant suction pressure, the refrigerant discharge pressure, the refrigerant discharge temperature, and the rotation speed.
  • This is a program for functioning as an output control unit that controls to output information on the deterioration of the compressor based on the time change of the actual power value acquired by the compressor.
  • FIG. 1 is a diagram showing a schematic configuration of an air conditioner 1 according to an embodiment.
  • the air conditioner 1 is an example of an air conditioner system.
  • the air conditioner 1 performs air conditioning by circulating a refrigerant in a refrigeration cycle (heat pump cycle).
  • the air conditioner 1 includes an outdoor unit 10 installed outdoors (outdoors), an indoor unit 20 installed indoors (air-conditioned space), a remote controller 30 operated by a user, and the like. It has.
  • the remote controller 30 includes a display unit 300 that displays various types of information.
  • the outdoor unit 10 includes a compressor 11, an outdoor heat exchanger 12, an outdoor fan 13, an outdoor expansion valve 14 (expansion valve), a four-way valve 15, temperature sensors 16 and 17, and pressure sensors 18 and 19. , And an outdoor control board 100.
  • the compressor 11 compresses the low-temperature low-pressure gas refrigerant by driving the compressor motor 111 and discharges the high-temperature and high-pressure gas refrigerant as the high-temperature and high-pressure gas refrigerant.
  • heat exchange is performed between the refrigerant flowing through the heat transfer tube (not shown) and the outside air sent from the outdoor fan 13.
  • the outdoor heat exchanger 12 operates as a condenser or an evaporator by switching the four-way valve 15.
  • the outdoor fan 13 is installed near the outdoor heat exchanger 12.
  • the outdoor fan 13 sends outside air to the outdoor heat exchanger 12 by driving the outdoor fan motor 13a.
  • the outdoor expansion valve 14 has a function of reducing the pressure of the refrigerant condensed by the "condenser” (one of the outdoor heat exchanger 12 and the indoor heat exchanger 21).
  • the refrigerant decompressed by the outdoor expansion valve 14 is guided to the "evaporator" (the other of the outdoor heat exchanger 12 and the indoor heat exchanger 21).
  • the four-way valve 15 is a valve that switches the flow path of the refrigerant in the refrigerant circuit Q according to the operation mode of the air conditioner 1.
  • the indoor unit 20 includes an indoor heat exchanger 21, an indoor fan 22, and an indoor control board 200.
  • the indoor heat exchanger 21 heat exchange is performed between the refrigerant passing through the heat transfer tube (not shown) and the indoor air sent from the indoor fan 22.
  • the indoor heat exchanger 21 operates as a condenser or an evaporator by switching the four-way valve 15.
  • the indoor fan 22 is installed near the indoor heat exchanger 21.
  • the indoor fan 22 sends indoor air to the indoor heat exchanger 21 by driving the indoor fan motor 22a.
  • the solid arrow shown in FIG. 1 indicates the flow of the refrigerant during the heating operation.
  • the line arrow indicates the flow of the refrigerant during the cooling operation.
  • the refrigerant is in the order of the compressor 11, the outdoor heat exchanger 12 (condenser), the outdoor expansion valve 14, and the indoor heat exchanger 21 (evaporator). It becomes a freezing cycle that circulates.
  • the compressor 11, the indoor heat exchanger 21 (condenser), the outdoor expansion valve 14, and the outdoor heat exchanger 12 (evaporator) It becomes a refrigeration cycle in which the refrigerant circulates in order.
  • the temperature sensor 16 of the outdoor unit 10 is installed near the inlet of the compressor 11 and detects the temperature of the refrigerant sucked into the compressor 11.
  • the temperature detected by the temperature sensor 16 is referred to as a compressor suction temperature.
  • the temperature sensor 17 is installed near the outlet of the compressor 11 and detects the temperature of the refrigerant discharged from the compressor 11.
  • the temperature detected by the temperature sensor 17 is referred to as a compressor discharge temperature.
  • the pressure sensor 18 is installed near the inlet of the compressor 11 and detects the suction pressure of the compressor 11 (compressor suction pressure).
  • the pressure sensor 19 is installed near the outlet of the compressor 11 and detects the discharge pressure of the compressor 11 (compressor discharge pressure).
  • the outdoor control board 100 includes a control unit 101, a storage unit 102, a communication unit 103, and a display unit 104.
  • the control unit 101 includes a CPU, ROM, RAM, and the like, and controls the entire outdoor unit 10.
  • the storage unit 102 stores various programs and various information.
  • the control unit 101 performs various processes by executing the program stored in the storage unit 102.
  • the communication unit 103 communicates with the indoor unit 20 by wire or wirelessly.
  • the display unit 104 displays various information.
  • the storage unit 102 stores the compressor power model 110 obtained by machine learning, and the control unit 101 includes the compressor power model and a predetermined measured value actually obtained. , The deterioration of the compressor 11 is determined. This process will be described in detail later.
  • the indoor control board 200 of the indoor unit 20 has a control unit 201, a storage unit 202, a first communication unit 203, and a second communication unit 204.
  • the control unit 201 includes a CPU, ROM, RAM, and the like, and controls the entire indoor unit 20.
  • the storage unit 202 stores various programs and various information.
  • the control unit 201 performs various processes by executing the program stored in the storage unit 202.
  • the first communication unit 203 communicates with the outdoor unit 10 by wire or wirelessly.
  • the second communication unit 204 communicates with the remote controller 30 by infrared communication.
  • the communication method in the communication between the outdoor unit 10 and the indoor unit 20 and the communication between the indoor unit 20 and the remote controller 30 is not limited to the embodiment.
  • the compressor power model stored in the storage unit 102 of the outdoor unit 10 will be described.
  • the compressor power can theoretically be estimated as in (Equation 1).
  • (Compressor power) ⁇ v ⁇ ⁇ ⁇ (compressor stroke volume) ⁇ (compressor rotation speed) ⁇ (h 1 ⁇ h 2th ) ⁇ ⁇ ad ⁇ ⁇ mot ...
  • each parameter is as follows. Note that ⁇ v , ⁇ ad , and ⁇ mot are values that differ depending on the operating state of the compressor and the model of the compressor.
  • ⁇ v Compressor volumetric efficiency
  • ⁇ Refrigerant suction density
  • h 1 Compressor inlet ratio enthalpy
  • h 2th Compressor outlet theoretical adiabatic compression ratio enthalpy
  • ⁇ mot Compressor motor efficiency
  • Equation 1 can also be described as (Equation 2).
  • Compressor power ⁇ v ⁇ ⁇ ⁇ (compressor stroke volume) ⁇ (compressor rotation speed) ⁇ (h 1 ⁇ h 2 )... (Equation 2)
  • h 2 is the specific enthalpy at the outlet of the compressor.
  • the outdoor unit 10 of the present embodiment uses a compressor power model that estimates the compressor power from five parameters as in (Equation 3). Specifically, the outdoor unit 10 estimates the degree of deterioration of the compressor by comparing the compressor power estimated from the compressor model with the actual compressor power.
  • Compressor power f 1 (Ps, Ts, Pd, Td, refrigerant circulation amount) ... (Equation 3)
  • each parameter is as follows.
  • Ps Compressor suction pressure
  • Ts Compressor suction temperature
  • Pd Compressor discharge pressure
  • the amount of refrigerant circulating is obtained by (Equation 4).
  • (Refrigerant circulation amount) ⁇ ⁇ ⁇ v ⁇ Compressor process volume ⁇ Compressor rotation speed... (Equation 4)
  • ⁇ is a function of pressure and temperature, and satisfies (Equation 5) from the state at the time of suction of the compressor.
  • ⁇ f (Ps, Ts) ...
  • the compressor process volume is the amount of refrigerant pushed away in one rotation of the compressor.
  • the number of revolutions of the compressor is the number of revolutions and is proportional to the frequency of the inverter (INV).
  • the compressor power model used in the present embodiment can determine the degree of deterioration according to the change in operating load in consideration of the basic physical phenomenon of the refrigeration cycle.
  • Machine learning here can be configured with a current prediction model that uses a linear regression (multiple regression) model.
  • the regression model is a model that returns the output as a continuous value with respect to the input. For example, if it is a regression model with two variables (x 1 , x 2 ) input and one variable (y) output, it is expressed in (Equation 9). As shown, it becomes a linear regression model including the square term and the interaction term.
  • a value obtained from actual operation data is given as teacher data as y (predicted value with respect to the input value), and the sensor values x 1 and x 2 of the operation data at that time are substituted, and the respective coefficients a to f are The minimum squared approximation is performed so that the prediction error of y is minimized, and the coefficient is obtained.
  • equation after obtaining the coefficients to the sensor values x 1, x 2, it is possible to obtain the predicted value of y.
  • one variable of the current value or the power value is predicted as a five-variable input of Ps, Ts, Pd, Td and the compressor rotation speed. Thereby, the current value or the voltage value can be predicted.
  • the main variables necessary for the physical model are included, it is possible to obtain a physically reasonable, interpretable and highly accurate machine learning formula without performing strict physical calculation.
  • the regression model may be a learning model using a neural network instead of a linear regression model.
  • FIG. 16 is a diagram showing a model of a neural network.
  • the neural network has an input layer 1601 for inputting sensor values (Ps, Ts, Pd, Td) and an output layer 1603 for predicting current or power, and an intermediate layer (weighted from the teacher data) in between.
  • Hidden layer 1602 is configured.
  • the intermediate layer (hidden layer) 1602 may be constructed from a plurality of layers.
  • supervised learning is used as in the linear learning model.
  • the compressor current or power during operation of the air conditioner is set in the output layer, and the five-variable inputs of Ps, Ts, Pd, Td, and the compressor rotation speed are set in the input layer.
  • the weighting coefficient of the intermediate layer is obtained from the data during operation by using an error backpropagation method or the like.
  • the model learned by this and having a fixed weighting coefficient functions as a model for predicting the current or power of a normal compressor each time an input variable is given.
  • a compressor of the same type as the compressor 11 of the air conditioner 1 according to the present embodiment is used.
  • FIG. 2 is a diagram showing the relationship between the actual current value of the compressor when the operating load is changed and the estimated current value obtained from the compressor power model under the same conditions.
  • the horizontal axis of the graph shown in FIG. 2 shows the actual current value, and the vertical axis shows the estimated current value.
  • the actual current value and the estimated current value correspond to almost 1: 1 and it can be seen that the compressor power model accurately estimates the actual current according to the load of the compressor 11.
  • FIG. 3 is a graph showing the frequency of appearance of the ratio of the actual voltage value to the estimated current value obtained from the compressor power model in the compressor within a certain period of time.
  • the horizontal axis of the graph shows the ratio of the actual voltage value to the estimated current value
  • the vertical axis shows the frequency of appearance.
  • FIG. 4 is a diagram showing the frequency of appearance in a normal compressor and the frequency of appearance in a compressor in which an abnormality has occurred.
  • the horizontal axis of the graph shown in FIG. 4 indicates the value of “(actual current value) / (estimated current value)”, that is, the compressor current ratio.
  • the vertical axis shows the frequency of appearance.
  • the solid line in the graph shows the frequency of appearance in a normal compressor.
  • the dotted line shows the frequency of appearance in the compressor where the abnormality has occurred.
  • the distribution of the appearance frequency shifts to the right as the degree of deterioration increases.
  • the control unit 101 of the outdoor unit 10 has an average value of the actual current value and the compressor current ratio obtained from the estimated current value obtained from the compressor power model (hereinafter, referred to as an actual average value). ) Find ⁇ m . Then, the control unit 101 obtains the degree of abnormality from the difference between the average value (hereinafter referred to as the estimated average value) ⁇ i estimated in a normal compressor and the actual average value ⁇ m. In this embodiment, ⁇ i is set to “1.0”. The control unit 101 uses a function f 3 such that the degree of abnormality increases as the difference between the actual average value ⁇ m and the estimated average value ⁇ i increases. As the compressor deteriorates and the mechanical loss increases, the power increases and the compressor current ratio gradually increases.
  • FIG. 5 is a flowchart showing an abnormality management process executed by the control unit 101.
  • the abnormality management process is a process executed when the air conditioning operation is started.
  • the control unit 101 first calculates the degree of abnormality (S100). Specifically, the control unit 101 acquires the compressor suction temperature (Ts) from the temperature sensor 16 and the compressor discharge temperature (Td) from the temperature sensor 17. Further, the control unit 101 acquires the pressure sensor 18 or the compressor suction pressure (Ps), and acquires the compressor discharge pressure (Pd) from the pressure sensor 19. Further, the control unit 101 acquires the frequency of the inverter of the compressor 11. Then, the control unit 101 uses these values as inputs of the compressor power model to obtain an estimated current value. The control unit 101 further acquires the actual current value (actual current value) of the compressor 11 and obtains the compressor current ratio in a certain section (time). The control unit 101 obtains the actual average value ⁇ m from the compressor current ratio in a certain section.
  • the control unit 101 determines the degree of abnormality.
  • the degree of abnormality increases as the deterioration of the compressor 11 progresses. That is, the degree of abnormality is an index value indicating a change due to aged deterioration in addition to an abnormality such as a failure, and can be defined as a degree of deterioration.
  • the process of S100 is an example of a current estimation process for obtaining an estimated current value and an abnormality degree estimation process for estimating a relative value of the estimated current value with respect to an actual current value as an abnormality degree.
  • the control unit 101 calculates the abnormality degree time differential value (x i / dt).
  • x i is the error probability in the process target section.
  • the control unit 101 compares the time differential value with the differential threshold value (S102).
  • the differential threshold value is a predetermined positive value.
  • the differential threshold value is preferably a value close to zero and larger than the time derivative value which is small enough to be regarded as zero.
  • the control unit 101 acquires the integrated operation time stored in the storage unit 102. Then, the control unit 101 sets a value obtained by subtracting the integrated operation time from the MTBF (Mean Time Between Failure) as the remaining life (S104).
  • the MTBF is the average life expectancy of the compressor 11 and is preset in the storage unit 102.
  • the integrated operation time is the total value of the operation time since the air conditioner 1 was installed and the operation was first started. It is assumed that the outdoor control board 100 has a timer for counting the integrated operation time, and the integrated operation time is stored in the storage unit 102.
  • MTBF is, for example, 2000 hours, 4000 hours, and the like. When the MTBF is 2000 hours, the remaining life in the initial stage (at the time of the first power-on) is 2000 hours, and the remaining life decreases with the lapse of time from the power-on.
  • the control unit 101 sets the time at which the extraline of the slope of the degree of abnormality with respect to the time obtained from the time derivative coincides with the lifetime point. It is set as the remaining life (S106).
  • the life point is a value of an abnormality degree at which it can be determined that an abnormality that should be stopped has occurred. It is assumed that the life point is set in the storage unit 102 in advance. The life point can be obtained from, for example, the monitor value of actual data in the market for a compressor of the same type, the result of a rigorous test at the time of developing the compressor, and the like.
  • the horizontal axis represents time and the vertical axis represents the degree of abnormality.
  • the time change (slope of the graph) of the degree of abnormality is almost zero in the section immediately after the operation of the compressor , for example, in the sections of x i-6 and x i-5. Is. Therefore, the extrapolation line with the slope of the degree of abnormality does not intersect the life point. Therefore, until the slope becomes a positive value, it is preferable to set the value obtained by subtracting the integrated operation time from MTBF as the remaining life.
  • the differential threshold value is set to a value larger than zero by a predetermined amount in order to absorb the noise of the time differential value. From the above, as described in S104, the control unit 101 sets "MTBF-integrated operating time" as the remaining life when the time derivative value is equal to or less than the differential threshold value.
  • the control unit 101 sets the time until the intersection of the extrapolated wire and the life point as the remaining life. In this way, the control unit 101 estimates the remaining life of the compressor based on the degree of abnormality, that is, the time change of the degree of deterioration.
  • the processing of S104 and S106 is an example of the remaining life estimation processing for estimating the remaining life of the compressor from the time change of the degree of deterioration.
  • control unit 101 sets not only the current (processing time point) time period x i, but also the time transition of x i , x i-1 , x i-2 , or the transition for each operating time.
  • the degree of anomaly increases at an accelerating rate and the remaining life changes non-linearly.
  • the control unit 101 determines the state of the compressor 11 (S108).
  • the compressor 11 can take two states, an operable state and an abnormal state.
  • the operable state is a state in which the operation of the compressor 11 can be continued from the viewpoint of the degree of abnormality
  • the abnormal state is a state in which the operation of the compressor 11 should be stopped from the viewpoint of the degree of abnormality.
  • the control unit 101 determines that the operation is possible when the abnormality degree is less than the abnormality degree threshold value, and determines that the abnormality state is when the abnormality degree is equal to or more than the abnormality degree threshold value.
  • the abnormality degree threshold value is a predetermined value, may be a value equal to the life point described with reference to FIG. 6, or may be a value smaller than the life point by a certain amount.
  • the control unit 101 controls to display the remaining life on the display unit 300 of the remote controller 30 (S110). Specifically, the control unit 101 outputs (transmits) the remaining life to the indoor control board 200 via the communication unit 103. On the other hand, when the indoor control board 200 receives the remaining life via the first communication unit 203, the indoor control board 200 transmits the remaining life to the remote controller 30 via the second communication unit 204. Then, the remote controller 30 displays the remaining life on the display unit 300.
  • the processing order of the state determination processing (S108) and the remaining life display processing (S110) is not limited to the embodiment, and the processing of S108 may be performed after the processing of S110, and the processing of S108 and S110. May be performed in parallel. As will be described later, the processes of S100 to S112 are repetitive processes, and if the remaining life is already displayed at the time of processing of S110, the control unit 101 updates the display of the remaining life in S110.
  • the control unit 101 controls to stop the air conditioning operation, that is, the operation of the compressor 11 (S114).
  • the control unit 101 advances the process to S100 and repeats the processes of S100 to S112.
  • the control unit 101 repeats the processes of S100 to S112 at a predetermined frequency such as every minute.
  • FIG. 7 is a diagram showing a display example of the remaining life.
  • the remaining life is represented by five stages, and in the display example, it is shown that only one stage out of the five stages is left.
  • text information indicating the operating state such as "health 1 (caution)" and "forced operation stop” is also displayed.
  • the soundness corresponds to five stages of remaining life, and is an evaluation value indicated by 1 to 5, and the lower the soundness value, the shorter the remaining life.
  • the display unit 300 also displays a spare part number indicating a spare of the compressor 11.
  • the air conditioner 1 can evaluate the deterioration of the compressor in consideration of the operating load without requiring the efficiency coefficient of the compressor and the physical characteristics of the refrigerant.
  • the air conditioner 1 stores in advance the compressor power model 110 according to the model of the compressor obtained by machine learning.
  • the compressor power model 110 can evaluate the degree of deterioration with high accuracy while being a compact calculation model. Further, at the time of shipment of the air conditioner 1, the compressor power model 110 is installed, so that the initial learning period after the equipment is installed can be eliminated.
  • the outdoor unit 10 performs the abnormality management process. Therefore, the information of the component parts of the air conditioner 1 can be grasped, and the characteristic change can be reflected in the air conditioner 1 even when a minor change of the compressor 11 is performed. Therefore, the processing can be performed more efficiently than when the deterioration is predicted by a device other than the air conditioner 1 such as an external server. Further, in the air conditioner 1 of the present embodiment, since communication with the external device is unnecessary, it is possible to reduce the communication band with the external device and reduce the processing load by the external device. can.
  • warning information may be displayed on a device other than the remote controller 30.
  • warning information may be displayed on the display unit 104 of the outdoor unit 10.
  • the outdoor unit 10 can communicate with an external device such as a centralized management device or a mobile device used by a user or the like via a network, warning information may be transmitted (output) to these external devices and displayed. good.
  • the information displayed on the remote controller 30 may be information on the degree of abnormality, that is, the deterioration of the compressor, and is not limited to the remaining life.
  • the control unit 101 may display the degree of abnormality.
  • the control unit 101 may take the reciprocal of the degree of abnormality, take 100 in a good state, and display an evaluation value that decreases with deterioration. Further, when displaying the degree of abnormality or its reciprocal, it is preferable to apply an appropriate low-pass filter to the output in order to avoid frequent changes in the value.
  • the control unit 101 may display a graph showing the history of the degree of abnormality as shown in FIG.
  • the abnormality management process may be executed by the control unit 201 of the indoor unit 20 instead of the control unit 101.
  • the control unit 201 receives information necessary for calculating the degree of abnormality such as the compressor suction pressure, the compressor suction temperature, the compressor discharge pressure, and the compressor discharge temperature via the first communication unit 203 via the outdoor control board 100. It shall be received from.
  • the control unit 101 sets an abnormality degree smaller than the abnormality degree threshold value referred to in the abnormality determination process (S108) as a low abnormality degree threshold value, and the abnormality degree is equal to or higher than the low abnormality degree threshold value and the abnormality degree degree. If it is less than the threshold value, the operation mode of the compressor 11 may be controlled to be switched from the normal mode to the low load mode.
  • the low load mode is an operation mode in which the operating load of the compressor 11 is lower than that in the normal mode.
  • the control unit 101 may further switch the operating load of the compressor 11 in stages according to the degree of abnormality.
  • the degree of anomaly in the calculation of the degree of anomaly , the difference between the estimated average value ⁇ i and the actual average value ⁇ m was referred to, but the control unit 101 said, “(Actual current).
  • the degree of anomaly may be calculated by further considering the difference in the standard deviation ⁇ of the appearance frequency of “value) / (estimated current value)”.
  • the difference of the standard deviation ⁇ is the difference between the estimated standard deviation ⁇ i estimated in a normal compressor, the actual current value, and the actual standard deviation ⁇ m obtained from the estimated current value obtained from the compressor power model. It is a difference. That is, the degree of anomaly increases as the difference between the actual average value ⁇ m and the estimated average value ⁇ i increases, and increases as the difference between the actual standard deviation ⁇ m and the estimated standard deviation ⁇ i increases.
  • the control unit 101 may use a compressor power model of a general compressor that does not depend on the model of the compressor. Even in this case, the deterioration of the compressor can be evaluated.
  • the control unit 101 may estimate the degree of deterioration of the compressor 11 by using the compressor suction pressure, the compressor suction temperature, the compressor discharge pressure, the compressor discharge temperature, and the current value.
  • the degree of deterioration may be estimated by a method that does not use the compressor power model. For example, the control unit 101 may estimate the degree of deterioration using a predetermined function.
  • the differential threshold value is set to a value closer to zero, and a time differential value larger than the differential threshold value is continuously obtained a predetermined number of times.
  • the process may be advanced to S106, and in other cases, the process may be advanced to S104.
  • the compressor power model may be a function that does not include the compressor suction pressure (Ts), as shown in (Equation 6). This is because the information on the compressor suction temperature (Ts) is finally reflected in the compressor discharge temperature (Td).
  • the outdoor unit 10 can evaluate the degree of abnormality with high accuracy even in the compressor power model of (Equation 6).
  • Compressor power f (Ps, Pd, Td, compressor rotation speed) ... (Equation 6)
  • the control unit 101 when calculating the degree of abnormality, replaces the actual current value and the estimated current value of the compressor 11 with the actual power value of the compressor 11 and the estimated power value. May be used.
  • the estimated power value can be obtained by using the compressor power model with the frequencies of Ts, Td, Ps, Pd and the inverter of the compressor 11 as inputs.
  • one control unit executes the abnormality management process using one storage unit 102, but other embodiments may be used.
  • a part of the processing may be executed by using a hardware circuit.
  • the outdoor unit 10 includes three compressors 11a, 11b, and 11c as shown in FIG.
  • the number of compressors may be two or more, and is not limited to three.
  • the other configurations of the outdoor unit 10 and the indoor unit 20 according to the second embodiment are the same as the configurations of the air conditioner 1 according to the first embodiment.
  • FIG. 9 is a flowchart showing an abnormality management process executed by the control unit 101 according to the second embodiment.
  • This process is a process in which the abnormality management process described with reference to FIG. 5 in the first embodiment is applied when there are a plurality of compressors.
  • the same processing as each processing of the abnormality management processing according to the first embodiment is assigned the same number and the description thereof will be omitted.
  • the control unit 101 obtains the remaining life of each compressor by processing S100 to S108 for all the compressors 11a to 11c provided in the outdoor unit 10 in operation. Immediately after the start of processing, all compressors 11a to 11c are subject to processing. After that, the control unit 101 controls to display the remaining life of each of the compressors 11a to 11c on the display unit 300 of the remote controller 30 (S120). Next, the control unit 101 determines whether or not a compressor in an abnormal state exists in the operating compressor based on the state of each compressor obtained in S108. If there is no compressor in the abnormal state (NO in S122), the process proceeds to S100. That is, in this case, the control unit 101 continues to determine the state of the compressor during operation and display the remaining life.
  • the control unit 101 stops the operation of the compressor in an abnormal state (S124). Next, it is confirmed whether or not there is another compressor in operation. If there is a compressor in operation (YES in S126), the process proceeds to S100. For example, in S124, when the operation of the compressor 11a is stopped, in the subsequent processing from S100, two compressors 11b and 11c are targeted for processing. On the other hand, if there is no compressor in operation (NO in S126), the abnormality management process is terminated.
  • FIG. 10 is a diagram showing a display example of the remaining life according to the second embodiment.
  • the display unit 300 displays the remaining life of each of the compressors 11a to 11c. As a result, the user can grasp the remaining life of each compressor.
  • the air conditioner according to the second embodiment includes a plurality of compressors, and the deterioration of each compressor can be evaluated. Further, the air conditioner can continue the air conditioning operation by the outdoor unit 10 by stopping the compressor in the abnormal state and continuing the operation of the compressor in the operable state.
  • the abnormality degree threshold value referred to in the second embodiment may be set to a value smaller than the abnormality degree threshold value referred to in the second embodiment.
  • the air conditioner 1 according to the third embodiment includes three outdoor units 10a to 10c, and each outdoor unit 10a to 10c includes one compressor 11a to 11c, respectively. ing.
  • the configuration of each outdoor unit 10a to 10c is the same as the configuration of the outdoor unit 10 described with reference to FIG.
  • a case where three outdoor units 10a to 10c are provided will be described as an example, but the number of outdoor units provided in the air conditioner 1 may be two or more, and the number is not limited to three. No.
  • one outdoor unit serves as a master to manage the abnormality of the compressor provided in each outdoor unit of the air conditioner.
  • the abnormality management process in the air conditioner 1 will be described by taking as an example a case where the outdoor unit 10a operates as a master and the outdoor units 10b and 10c operate as slaves.
  • FIG. 12 is a flowchart showing an abnormality management process executed by the control unit 101 of each of the plurality of outdoor units.
  • the flowchart shown on the left of FIG. 12 shows the processing executed by the control unit 101 of the outdoor unit operating as a slave.
  • the flowchart shown on the right of FIG. 12 shows the processing executed by the control unit 101 of the outdoor unit operating as the master.
  • the control unit 101 of the outdoor units 10b and 10c (hereinafter referred to as slave units) operating as slaves first performs the first state determination process (S200).
  • the first state determination process is the same as the process of S100 to S108 described with reference to FIG.
  • the control unit 101 of the slave machine transmits the state information indicating the state of the compressor of the slave machine obtained by the first state determination process to the outdoor unit 10a (hereinafter referred to as the master machine) operating as a master. (S202).
  • the control unit 101 of the master machine performs the first state determination process (S220).
  • the first state determination process (S220) is the same as the first state determination process in S200.
  • the control unit 101 receives the state information from the slave unit (S222).
  • the processing order of the processing of S220 and the processing of S222 is not limited to the embodiment. That is, the control unit 101 may perform the processing of S220 after the processing of S222, or the processing of S220 and the processing of S222 may be performed in parallel.
  • the control unit 101 of the master machine controls to display the remaining life of all the compressors 11a to 11c included in the air conditioner 1 on the display unit 300 of the remote controller 30 (S224).
  • the control unit 101 of the master machine determines whether or not there is a compressor in an abnormal state among the compressors in operation (S226). If there is no compressor in an abnormal state (NO in S226), the process proceeds to S220, and the state determination of each compressor and the display of the remaining life are continued.
  • the control unit 101 of the master machine is the compressor of the master machine. It is controlled to stop the operation of (S236).
  • the control unit 101 of the master machine is in the abnormal state.
  • a stop instruction is transmitted to the slave machine having the compressor (S230).
  • the stop instruction is information for instructing the stop of the compressor.
  • the control unit 101 of the master machine advances the processing to S220 when the compressor of the master machine is in operation (YES in S232). That is, the control unit 101 of the master machine continues to determine the state of the compressor in operation including the compressor of the master machine and display the remaining life. If the compressor of the master machine is not in operation and the compressor of the slave machine is in operation (NO in S232, YES in S234), the control unit 101 of the master machine advances the process to S222. That is, in this case, the control unit 101 of the master machine excludes the compressor of the master machine, and continues to determine the state of the compressor of the slave machine in operation and display the remaining life. The control unit 101 of the master machine also ends the process when there is no compressor in operation (NO in S232, NO in S234).
  • the control unit 101 of the master machine transmits a stop instruction to all the slave machines determined to be in the abnormal state. Further, when the compressor of the slave machine is determined to be in an abnormal state and the compressor of the master machine is also determined to be in an abnormal state, the control unit 101 transmits a stop instruction to the slave machine and the master machine. Stop the operation of the compressor.
  • control unit 101 of the master machine advances the processing to S222 if there is a compressor in operation (YES in S238), and if there is no compressor in operation, the processing proceeds to S222. (NO in S238), the process ends.
  • control unit 101 of the slave machine receives a stop instruction from the master machine within a certain period of time after the processing of S202 (YES in S204), the control unit 101 of the slave machine stops the operation of the compressor of the slave machine (YES). S206), the process is terminated. If the stop instruction is not received within a certain period of time (NO in S204), the control unit 101 of the slave machine advances the process to S200. That is, in this case, the control unit 101 of the slave machine continues to determine the state of the compressor of the slave machine.
  • the deterioration of each compressor can be evaluated even in a system provided with a plurality of outdoor units, such as the air conditioner 1 according to the third embodiment. Further, the air conditioner 1 can continue the air conditioning operation by the air conditioner 1 by stopping the compressor in the abnormal state and continuing the operation of the compressor in the operable state.
  • the management device when there is a management device that manages a plurality of outdoor units 10a to 10c, the management device receives state information from each outdoor unit and the remaining life of each compressor. Management and status determination may be performed. In this case, it is assumed that the management device is communicably connected to each of the outdoor units 10a to 10c.
  • the air conditioner 1 according to the fourth embodiment will be mainly described as being different from the air conditioner 1 according to the first embodiment.
  • the configuration of the air conditioner according to the fourth embodiment is the same as the configuration of the air conditioner 1 according to the first embodiment.
  • FIG. 13 is a flowchart showing an abnormality management process executed by the control unit 101 of the air conditioner 1 according to the fourth embodiment.
  • the abnormality management process is a process executed when the air conditioning operation is started.
  • the control unit 101 first calculates the degree of abnormality (S300). This process is the same as the process of S100 described with reference to FIG. Next, the control unit 101 compares the degree of abnormality with the first degree of abnormality threshold.
  • the first abnormality degree threshold value is a preset value, which is smaller than the lifetime point.
  • the control unit 101 When the degree of abnormality is equal to or less than the first threshold value (NO in S302), the control unit 101 resets the degree of abnormality count (S304). That is, the control unit 101 returns the abnormality degree count to the initial value (zero). Then, the control unit 101 advances the process to S300. Here, it is assumed that the abnormality degree count is set to an initial value at the start of the abnormality management process.
  • the control unit 101 adds 1 to the value of the degree of abnormality count (S306).
  • the control unit 101 determines the state of the compressor (S308).
  • the operable state, the first abnormal state, and the second abnormal state are obtained in ascending order of the degree of abnormality.
  • the control unit 101 determines that the operation is possible.
  • the control unit 101 determines that the second abnormal state is determined when the abnormality degree count is larger than the second count threshold value or when the abnormality degree is larger than the second abnormality degree threshold value.
  • the control unit 101 determines that the first abnormal state is determined when the abnormality degree count is larger than the first count threshold value and does not satisfy the condition of the second abnormal state.
  • the control unit 101 determines that the abnormality degree is the first abnormality state.
  • the second abnormality degree threshold value is a value larger than the first abnormality degree threshold value.
  • the second abnormal state is an abnormal state in which the operation needs to be stopped, and from this viewpoint, the second abnormal degree threshold value is preferably a value close to the life point.
  • the second count threshold value is a value larger than the first count threshold value.
  • the control unit 101 determines that it is in the first abnormal state (first abnormal state in S310)
  • the control unit 101 displays warning information on the display unit 300 (S312).
  • the warning information is information indicating that the life is approaching.
  • the control unit 101 then proceeds with the process to S300.
  • the control unit 101 determines that it is in the second abnormal state (second abnormal state in S310)
  • the control unit 101 stops the operation of the compressor 11 (S314) and ends the abnormality management process.
  • the control unit 101 determines that the operation is possible (the operation is possible in S310)
  • the control unit 101 advances the process to S300. In this way, the control unit 101 repeats the processes of S300 to S312.
  • the control unit 101 repeats the processes of S300 to S312 at a predetermined frequency such as 1 minute.
  • the air conditioner 1 according to the fourth embodiment manages the degree of abnormality in three stages, displays a warning in the first abnormal state, and stops the operation in the second abnormal state. Can be done. That is, the air conditioner 1 of the fourth embodiment can evaluate the deterioration of the compressor in the same manner as the air conditioner 1 of the other embodiments.
  • the control unit 101 does not have to use the abnormality degree count in the state determination. That is, the control unit 101 determines that the abnormality is the first abnormality state when the abnormality degree is equal to or more than the first abnormality degree threshold value and is equal to or less than the second abnormality degree threshold value, and the second abnormality degree is greater than the second abnormality degree threshold value. It may be determined that it is in an abnormal state, and if it is less than the first abnormality degree threshold value, it may be determined that it is in an operable state. Further, in this case, it is preferable to set the first abnormality degree threshold value to a higher value than in the case of using the abnormality degree count in consideration of the fluctuation of the abnormality degree value.
  • the control unit 101 stops the operation and displays stop information indicating that the operation is stopped due to a higher degree of abnormality. It may be controlled so as to cause. This allows the user to confirm the reason for the shutdown.
  • control unit 101 operates the compressor 11 in addition to displaying the warning information or instead of displaying the warning information when the first abnormal state is determined.
  • the mode may be controlled to switch from the normal mode to the low load mode.
  • control unit 101 may display information on deterioration of the compressor in S312 described with reference to FIG. 13, and the display content is not limited to the embodiment.
  • control unit 101 may display the degree of abnormality.
  • control unit 101 may display the remaining life and the graph described in the first embodiment.
  • FIG. 14 is a flowchart showing an abnormality management process executed by the control unit 101 of the air conditioner 1 according to the fifth embodiment.
  • the abnormality management process is a process executed when the air conditioning operation is started.
  • the abnormality management process according to the fifth embodiment is a process in which the abnormality management process (FIG. 13) according to the fourth embodiment is applied when there are a plurality of compressors.
  • the same processing as each processing of the abnormality management processing according to the fourth embodiment is assigned the same number and the description thereof will be omitted.
  • the control unit 101 performs the processes of S300 to S308 for the compressors 11a to 11c provided in the outdoor unit 10 that are in operation. Thereby, the state of each compressor 11a to 11c is determined.
  • the control unit 101 confirms whether or not there is a compressor determined to be in the first abnormal state in S308 (S320).
  • the control unit 101 controls to display the warning information on the display unit 300 of the remote controller 30 (S322).
  • the warning information includes information for identifying the compressor determined to be in an abnormal state, a spare number, and the like.
  • the control unit 101 confirms whether or not there is a compressor determined to be in the second abnormal state (S324).
  • the control unit 101 controls to stop the operation of the compressor in the second abnormal state (S326). If the compressor in the first abnormal state does not exist in S320 (NO in S320), the control unit 101 advances the processing to S324 without performing the processing in S322.
  • the control unit 101 confirms whether or not there is a compressor in operation (S328).
  • the control unit 101 also advances the process to S328 without performing the process of S326 when the compressor in the second abnormal state does not exist in S324 (NO in S324).
  • S328 if there is a compressor in operation (YES in S328), the control unit 101 advances the process to S300. That is, the control unit 101 continues to determine the state of the compressor during operation. On the other hand, if there is no compressor in operation (NO in S328), the control unit 101 ends the abnormality management process.
  • control unit 101 can manage the degree of deterioration (abnormality) of each compressor in three stages in a system equipped with a plurality of compressors. Further, the air conditioner can continue the air conditioning operation by the outdoor unit 10 by stopping the compressor in the second abnormal state and continuing the operation of the compressor in the first abnormal state and the operable state. can.
  • the control unit 101 may stop not only the compressor in the second abnormal state but also the compressor in the first abnormal state when the compressor in the operable state exists. On the other hand, the control unit 101 may continue the operation of the compressor in the first abnormal state when the compressor in the operable state does not exist.
  • the air conditioner 1 according to the sixth embodiment includes three outdoor units 10a to 10c and is provided with each outdoor unit, similarly to the air conditioner 1 according to the third embodiment described with reference to FIG.
  • Each of the 10a to 10c includes one compressor 11a to 11c.
  • FIG. 15 is a flowchart showing an abnormality management process executed by the control unit 101 of each of the plurality of outdoor units according to the sixth embodiment. Also in the present embodiment, as described in the third embodiment, one outdoor unit operates as a master, and the other outdoor unit operates as a slave. The flowchart shown on the left of FIG. 15 shows the processing executed by the control unit 101 of the slave machine. The flowchart shown on the right side of FIG. 15 shows the processing executed by the control unit 101 of the master machine.
  • the control unit 101 of the slave machine first performs the second state determination process (S400).
  • the second state determination process is the same as the process of S300 to S308 described with reference to FIG. As a result, the state of the compressor of each slave unit is determined.
  • the control unit 101 of the slave machine transmits the state information indicating the state of the compressor of the slave machine obtained by the second state determination process to the master machine (S402).
  • control unit 101 of the master machine performs the second state determination process (S420). As a result, the state of the compressor of the master machine is determined.
  • the second state determination process in S420 is the same as the second state determination process in S400.
  • the control unit 101 of the master machine receives the state information from the slave machine (S422).
  • the control unit 101 of the slave machine confirms whether or not the compressor in the first abnormal state exists (S424).
  • the control unit 101 controls to display the warning information on the display unit 300 of the remote controller 30 (S426).
  • the warning information includes information for identifying the compressor determined to be in an abnormal state, a spare number, and the like. If the compressor in the first abnormal state does not exist (NO in S424), the control unit 101 advances the processing to S428 without performing the processing of S426.
  • the control unit 101 confirms whether or not there is a compressor determined to be in the second abnormal state (S428).
  • the control unit 101 further confirms whether or not the compressor in the second abnormal state is the compressor of the master machine (S430).
  • the control unit 101 controls to stop the operation of the compressor of the master machine (S432).
  • the control unit 101 confirms whether or not there is a compressor in operation in the air conditioner 1 (S434). If there is a compressor in operation (YES in S434), the control unit 101 advances the process to S422. That is, the control unit 101 acquires the state information of the compressor in operation and continues the process of S424 or less. On the other hand, if there is no compressor in operation (NO in S434), the abnormality management process is terminated.
  • the control unit 101 transmits a stop instruction to the slave machine having the compressor in the second abnormal state. (S436).
  • the control unit 101 confirms whether or not the compressor of the master machine and the compressor of the slave machine are in operation (S438, S440). If the compressor of the master machine is in operation (YES in S438), the control unit 101 advances the process to S420. In this case, when all the compressors of the slave machines are stopped, the processing of S422 is omitted, and the post-processing of the processing of S420 proceeds to S424. If the compressor of the master machine is stopped and the compressor of the slave machine is in operation (NO in S438, YES in S440), the process proceeds to S422.
  • control unit 101 of the slave machine receives a stop instruction from the master machine within a certain period of time after the processing of S402 (YES in S404), the control unit 101 of the slave machine stops the operation of the compressor of the slave machine (S406). , End the process. If the stop instruction is not received within a certain period of time (NO in S404), the control unit 101 of the slave machine advances the process to S400. That is, in this case, the control unit 101 of the slave machine continues to determine the state of the compressor of the slave machine.
  • the deterioration of each compressor can be evaluated even in a system provided with a plurality of outdoor units, such as the air conditioner according to the sixth embodiment. Further, the air conditioner can continue the air conditioning operation by the air conditioner by stopping the compressor in the second abnormal state and continuing the operation of the compressor in the operable state and the first abnormal state. can.
  • the air conditioner of the above embodiment it is possible to accurately evaluate the deterioration of the compressor according to the operating load without requiring the efficiency coefficient of the compressor and the physical characteristics of the refrigerant. Further, the compressor power model used for evaluating the deterioration of the compressor is generated by machine learning for each model of the compressor. Therefore, it is possible to evaluate the deterioration (abnormality) in consideration of the operating load according to the model of the compressor. Further, in the air conditioner of the present embodiment, deterioration can be evaluated in both the cooling and heating operating states.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

La présente invention concerne un système de climatisation équipé d'un compresseur, d'un échangeur de chaleur extérieur, d'une vanne de détente et d'un échangeur de chaleur intérieur et qui comprend : une unité d'acquisition qui acquiert la valeur de courant ou la valeur de puissance, la pression d'aspiration de fluide frigorigène, la pression de refoulement de fluide frigorigène, la température de refoulement de fluide frigorigène et la vitesse de rotation du compresseur ; une unité d'estimation qui estime la valeur de courant ou la valeur de puissance du compresseur à partir des variations temporelles de la pression d'aspiration du fluide frigorigène, de la pression de refoulement du fluide frigorigène, de la température de refoulement du fluide frigorigène et de la vitesse de rotation ; et une unité de sortie qui délivre des informations concernant la détérioration du compresseur sur la base de la relation entre la valeur de courant estimée, qui est estimée par l'unité d'estimation et les variations temporelles dans les valeurs de courant réelles acquises par l'unité d'acquisition ou la relation entre la valeur de puissance estimée, qui est estimée par l'unité d'estimation et les variations temporelles dans les valeurs de puissance réelles acquises par l'unité d'acquisition.
PCT/JP2020/005983 2020-02-17 2020-02-17 Système de climatisation, dispositif de gestion de fonctionnement et programme WO2021166020A1 (fr)

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WO2023181717A1 (fr) * 2022-03-22 2023-09-28 三菱電機株式会社 Dispositif d'inférence, procédé d'inférence et dispositif d'apprentissage

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CN114061101B (zh) * 2021-10-28 2023-05-16 佛山市顺德区美的电子科技有限公司 一种控制方法、装置、空调新风设备及存储介质

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JPH06307348A (ja) * 1993-04-21 1994-11-01 Matsushita Refrig Co Ltd 空気調和装置
JP2010107189A (ja) * 2008-09-30 2010-05-13 Daikin Ind Ltd 冷凍装置の診断方法、冷凍装置の診断装置、及び冷凍装置

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JPH06307348A (ja) * 1993-04-21 1994-11-01 Matsushita Refrig Co Ltd 空気調和装置
JP2010107189A (ja) * 2008-09-30 2010-05-13 Daikin Ind Ltd 冷凍装置の診断方法、冷凍装置の診断装置、及び冷凍装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023181717A1 (fr) * 2022-03-22 2023-09-28 三菱電機株式会社 Dispositif d'inférence, procédé d'inférence et dispositif d'apprentissage

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