JP4341779B2 - Air conditioner abnormality detection device and abnormality detection method - Google Patents

Description

  The present invention relates to an abnormality detection device and an abnormality detection method for detecting and diagnosing a decrease in air conditioning capability of an air conditioner.

  In an air conditioner (for example, a gas engine heat pump: GHP), there is already a technology that is connected to a remote monitoring computer via an information network or a dedicated line and uses the remote monitoring computer to detect a start failure or other abnormality. Have been proposed (see Patent Document 1).

  In a remotely monitored air conditioner, the temperature difference between the set temperature of the indoor unit and the suction temperature into the indoor unit, that is, the room temperature is measured, and if the temperature difference exceeds the threshold, it is determined that there is an abnormality. Techniques to do this have also been proposed (for example, Patent Document 2). However, the timing of the determination is that the elapsed time of operation from the thermo-ON of the indoor unit (for example, in the case of cooling, when the room temperature becomes higher than the set temperature by a predetermined temperature or more) At that time.

However, when the outside air temperature is abnormally high or the set temperature of the indoor unit is abnormally low, even if the air conditioner itself is normal, the temperature difference between the set temperature of the indoor unit and the suction temperature tends to increase. Therefore, in the above-described conventional technology, the temperature difference exceeds the threshold value even though the air conditioner itself is normal, and there is a possibility of erroneous determination.
JP 2002-277032 A JP 2002-115891 A

  The present invention has been proposed in view of the above-described problems of the prior art. When the air conditioner itself is normal, the outside air temperature is abnormally high (in the case of so-called “hot heat”), Even if the set temperature is abnormally low, there is no misjudgment that there is a sign of air conditioner capacity decline or abnormality, and there is no sign of air conditioner capacity decline or abnormality. It is an object of the present invention to provide an air conditioner abnormality diagnosis apparatus and method that does not require measurement of the elapsed operation time from the “thermo ON” of an indoor unit.

  The air conditioner abnormality diagnosis device (1) according to the present invention has a representative value of the outside air temperature (for example, the outside temperature when the load of the air conditioner becomes highest within one day) and the representative value of the indoor unit air intake temperature. (For example, the indoor unit air intake temperature when the load on the air conditioner becomes highest in one day), the representative value of the indoor unit set temperature (for example, the load on the air conditioner becomes highest in one day) Storage means (database 61) for storing the indoor unit set temperature at the time), means for calculating the average value of the outside air temperature for a certain period (outside air temperature moving average value computing means 62), and the indoor unit air suction temperature for a certain period Means for calculating the average value of the indoor unit (indoor unit air suction temperature movement average value calculating unit 63) and means for calculating the average value of the difference between the indoor unit air suction temperature and the indoor unit set temperature for a certain period (of the set temperature) Means 64 for calculating the moving average of the difference, and control means (low air conditioning capacity) Determining means 65), wherein the control means (65) has an average value of the outside air temperature lower than a predetermined temperature, and an average value of a difference between the indoor unit air suction temperature and the indoor unit set temperature is predetermined. When the temperature is equal to or higher than the temperature, and the average value of the indoor unit air intake temperature is equal to or higher than the predetermined temperature, it is determined that there is a sign of abnormality (in the air conditioner 2) within a predetermined period of time. It is characterized by being configured to perform control (FIG. 1).

  The abnormality diagnosis method for an air conditioner according to the present invention is based on the representative value of the outside air temperature (for example, the outside air temperature when the load on the air conditioner becomes highest within one day) (outside air temperature moving average value calculating means 62. And calculating the average value of the outside air temperature over a certain period (a in step S3) and the representative value of the indoor unit air intake temperature (for example, when the load on the air conditioner becomes highest in one day) Of the indoor unit air suction temperature) (using the indoor unit air suction temperature moving average value calculation means 63) (step c of step S3), and the step of calculating the average value of the indoor unit air suction temperature for a certain period, and the indoor unit air Typical value of suction temperature (for example, indoor unit air suction temperature when load of air conditioner becomes highest in one day) and typical value of indoor unit set temperature (for example, load of air conditioner within one day) (The indoor unit set temperature when the temperature becomes the highest) A step of calculating an average value of differences between the indoor unit air suction temperature and the indoor unit set temperature for a certain period (by means 64 for calculating the dynamic average value); 65)) The average value of the outside air temperature is lower than the predetermined temperature, the average value of the difference between the indoor unit air suction temperature and the indoor unit set temperature is equal to or higher than the predetermined temperature, and the indoor unit air suction temperature A step (S4) of calculating the number of days within the predetermined period when the average value of the temperature is equal to or higher than the predetermined temperature, and if the calculated number of days is less than the predetermined number of days (in the air conditioner) Determining that there is no sign (S5), and determining that there is a sign of abnormality (S6) when the calculated number of days is equal to or greater than a predetermined number of days (in the air conditioner) (S5, S6). (Fig. 2).

  In the abnormality diagnosis device for an air conditioner according to the present invention, the air conditioner (2) is connected to a remote monitoring system (monitoring computer 6) via an information network (N), and the remote monitoring system includes the storage means. (Database 61), means for calculating an average value of outside air temperature for a certain period (outside air temperature moving average value calculating means 62), and means for calculating an average value of indoor unit air suction temperature for a certain period (indoor air intake) Temperature moving average value calculating means 63), means for calculating the average value of the difference between the indoor unit air suction temperature and the indoor unit set temperature for a certain period (means 64 for calculating the moving average value of the difference from the set temperature), , The control means (air-conditioning capacity decrease judging means 65), and (and the remote monitoring system 6) via the information network (N), the representative value of the outside air temperature, the indoor unit air suction temperature Representative of , Preferably configured so as to obtain a representative value of the indoor unit set temperature.

  Here, in this specification, the term “information network” includes the Internet, a local area network (LAN), a system using a dedicated line, and other words that include all networks that can exchange information. It is used.

  In the air conditioner abnormality diagnosis method of the present invention, the step of calculating the average value of the outside air temperature (a in step S3) and the step of calculating the average value of the indoor unit air intake temperature (c in step S3). And the step of calculating the average value of the difference between the indoor unit air suction temperature and the indoor unit set temperature (step S3 b) is a remote monitoring connected to the air conditioner (2) via the information network (N). It is preferably carried out by the system (monitoring computer 6), and the representative value of the outside air temperature, the representative value of the indoor unit air suction temperature, and the representative value of the indoor unit set temperature are preferably acquired via the information network (N).

  In addition, the air conditioner abnormality diagnosis apparatus (1A) according to the present invention has an outside air temperature (for example, the outside air temperature when the load on the air conditioner becomes highest within one day), a room temperature (for example, within one day). Storage means (database 61A) for storing the room temperature when the load on the air conditioner is highest) and the set temperature (for example, the set temperature in the room when the load on the air conditioner is highest within a day). , Standard deviation calculating means (66), means for calculating an average value of room temperature for a certain period (room temperature average value calculating means 63), means for calculating an average value of differences between room temperature and a set temperature for a certain period (difference) Calculation means 64) and control means (air-conditioning capacity reduction judgment means 65A), the control means (65A) is such that the outside air temperature (on the day to be judged) is higher than the first predetermined temperature (for example, 30 ° C.). Low temperature and the room temperature (on the day to be judged) is the second The difference between the room temperature and the set temperature (on the day to be judged) is equal to or higher than the predetermined temperature (the predetermined temperature shown in Formula A2), and the predetermined temperature is the difference between the room temperature and the set temperature shown in Formula A3. ) If this is the case, it is determined that there is a sign of abnormality (in the air conditioner 2), and the second predetermined value (predetermined temperature shown in Formula A2) is multiplied by a specific multiplier to the average value of room temperature over a predetermined period. The third predetermined temperature (predetermined temperature of the difference between the room temperature and the set temperature shown in Formula A3) is obtained by multiplying the average value of the difference between the room temperature and the set temperature for a predetermined period by a specific multiplier. It is characterized in that the control is a numerical value obtained by adding the standard deviation values (FIG. 6).

  In addition, the air conditioner abnormality diagnosis method of the present invention using the air conditioner abnormality diagnosis apparatus (1A) is based on the outside air temperature (for example, the outside air temperature when the load on the air conditioner becomes highest within one day). Measuring the room temperature, measuring the room temperature (for example, the room temperature when the load of the air conditioner is highest in one day), calculating the average room temperature for a certain period, and the room temperature standard A step of calculating the deviation, a step of calculating an average value of the difference between the room temperature and the set temperature for a certain period, a step of calculating a standard deviation of the difference between the room temperature and the set temperature, and (on the day to be judged) The temperature is lower than a first predetermined temperature (for example, 30 ° C.), and the room temperature (on the day to be determined) is equal to or higher than a second predetermined temperature (predetermined temperature indicated by Formula A2), and (determination The difference between the room temperature on the day to be performed and the set temperature is the third predetermined temperature (formula A And a step of determining that there is a sign of abnormality (in the air conditioner 2) when the temperature is equal to or higher than the predetermined temperature of the room temperature and the set temperature shown in FIG. 3, and the second predetermined value (formula A2) Is a numerical value obtained by adding a standard deviation value obtained by multiplying the average value of room temperature over a predetermined period by a specific multiplier, and the third predetermined temperature (predetermined temperature of the difference between the room temperature and the set temperature shown in Formula A3) ) Is a numerical value obtained by adding a standard deviation value obtained by multiplying the average value of the difference between the room temperature and the set temperature for a predetermined period by a specific multiplier (FIG. 7).

Here, as a predetermined period, when a certain period (symbol L in FIGS. 7 and 8: for example, 365 days) has elapsed since the start of use of the air conditioner, the certain period (FIGS. 7 and 8). The code L is preferably 365 days). On the other hand, if a certain period of time (symbol L in FIGS. 7 and 8, for example, 365 days) has not elapsed since the start of use of the air conditioner, the certain period is the day of diagnosis from the start of use of the air conditioner ( It is preferable to set the period before a predetermined number of days (symbol D in FIGS. 7 and 8: for example, 10 days) before the diagnosis date.
Further, a plurality of types of numerical values (for example, “3” and “1.6”) are selected as the specific multipliers to be multiplied by the standard deviation value, and the degree of air conditioning capability reduction (emergency level) is set to a high level (step S36). It is possible to configure so that the determination is made at each level divided into two stages of low level (step S42) (FIGS. 8 and 9).
Here, in both the diagnosis date and the predetermined period, “room temperature” and “temperature difference between room temperature and set temperature” extract only data collected when the outside air temperature is less than 30 ° C.

  According to the present invention having the air conditioner abnormality diagnosis device (1) and the diagnosis method (flowchart in FIG. 2) having such a configuration, the average temperature of the outside air temperature over a certain period (for example, the moving average value of the outside air temperature for the most recent A day) If the air temperature is not below the threshold value, it is not judged as abnormal, so the outside air temperature is abnormally high (so-called “hot heat”), even if the indoor temperature (the air suction temperature of the indoor unit) does not decrease, the air conditioner There is no misjudgment that there is a sign of a decline in capacity or a sign of abnormality.

  If the set temperature is set to an unusually low temperature, the "indoor unit suction temperature-the indoor unit set temperature" will increase even though the air suction temperature of the indoor unit is not high (the set temperature and The difference from room temperature becomes large). Even in this case, unless the “indoor unit suction temperature” (that is, room temperature) is high, it is not determined that there is an abnormality. Therefore, it is possible to prevent erroneous determination that “there is a sign of failure” because the set temperature is abnormally set to a low temperature.

  As the data necessary for the determination, a representative value (for example, a numerical value when the load of the air conditioner becomes the highest) obtained regardless of the thermo-ON timing is used. Therefore, there is no need to measure the time elapsed from the thermo-ON.

  In addition, the remote monitoring system (monitoring computer 6) connected (informatively) to the air conditioner via the information network is configured to perform abnormality diagnosis, so that the air conditioner performing remote monitoring by the server can be used. The invention can be applied.

Alternatively, since the “outside air temperature” at the time point, the “indoor suction temperature” at the time point, and the “indoor suction temperature” at the time point—the “set temperature” are the measurement targets, a method using the average value of the data for a certain period Can prevent a decrease in sensitivity due to the effect of data deterioration. That is, if data that falls below the predetermined temperature is recognized even once, it can be taken as a sign of failure.
In other words, the accuracy of abnormality determination increases.

  Furthermore, by dividing the second and third predetermined values into two stages, the signs of abnormality can be determined at a high level and a low level, and a countermeasure when an alarm is issued becomes clear.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, the configuration of the first embodiment will be described with reference to the block diagram of FIG.
In FIG. 1, an abnormality detection device for an air conditioner generally indicated by reference numeral 1 includes an air conditioner 2 as a large unit, a monitoring computer 6 that receives information from the air conditioner 2 via a network N, It comprises display means 7 and warning means 8 connected to the monitoring computer 6.

  Connected to the air conditioner 2 are an indoor temperature sensor 3 for measuring the temperature of air sucked into an indoor unit (not shown), an outside air temperature sensor 4 for measuring outside air temperature, and a remote controller 5 for operating the air conditioner. Information from the sensor 3, the outside air temperature sensor 4, and the remote controller 5 is transmitted to the monitoring computer 6 via the network N.

  The monitoring computer 6 includes a database 61 that is a storage means for storing a set temperature, threshold values for control (B ° C., D ° C., E ° C., which will be described later), etc. Air temperature moving average value calculating means (abbreviated as outside air temperature average value calculating means) 62 and indoor air suction temperature moving average value calculating means (abbreviated as indoor air temperature average value) for calculating the moving average value of indoor unit air suction temperature. Calculation means) 63, difference average value calculation means 64 for calculating the average value of the difference between the indoor unit air suction temperature and the indoor unit set temperature, the average value of the outside air temperature calculated by the outside air temperature average value calculating means 62, From the average value of the indoor temperature calculated by the indoor air temperature average value calculating means 63 and the average value of the difference between the indoor unit air suction temperature calculated by the difference average value calculating means 64 and the indoor unit set temperature, the air conditioner Is the ability of 2 decreasing? Determine, with displays the determination result on the display unit 7, when the capacity of the air conditioner 2 is lowered is configured so as to warn the reduced ability to warning means 8.

  Next, an abnormality diagnosis method according to the first embodiment will be described with reference to the flowchart of FIG.

  First, in step S1, the indoor temperature sensor 3 (see FIG. 1) measures the room temperature, the outside air temperature sensor 4 (see FIG. 1) measures the outside air temperature, and the air conditioner operation remote control 5 (see FIG. 1). The indoor unit set temperature set by is referred to.

  In the next step S2, the room temperature, the outside temperature measured in step S1, and the set temperature set by the remote control 5 for operating the air conditioner are transmitted to the remote monitoring computer 6 via the network N for remote monitoring. Once read into the database 61 of the computer 6, the process proceeds to the next step S3.

In step S3, first, the moving average value of the “outside air temperature” for the latest A days is calculated by the outside air temperature average value calculating means 62.
Next, the moving average value of “indoor suction temperature” − “set temperature” for the latest A days is calculated by the difference average value calculating means 64. Here, the “set temperature” is a control target value of the room temperature.
Furthermore, the indoor suction temperature average value calculation means 63 calculates the moving average value of the “indoor suction temperature” for the most recent A day for each indoor unit. Here, the “indoor suction temperature” is a value when the load of the air conditioner 2 becomes the highest.
However, the parameter of the average value in the calculation of the moving average value of the “room suction temperature” for the most recent A day and the parameter of the average value in the calculation of the value obtained by subtracting the “set temperature” from the “room suction temperature” include Data during stoppage of the air conditioner 2 is not included.

In step S3, the most recent A day moving average value of the outside air temperature is a numerical value obtained by adding the outside air temperature when the load on the air conditioner 2 becomes the highest during the most recent A day and dividing by A.
Here, in calculating the moving average value, “the numerical value when the load on the air conditioner is highest” is defined as the “representative value” of the day, and the representative value for A day is added and divided by “A”. However, the “representative value” is not limited to “a numerical value when the load on the air conditioner is highest”.

Next, in step S4, the remote monitoring computer (see FIG. 1) 6 determines whether there are more than a predetermined number of days that simultaneously satisfy the following conditions in a predetermined period (for example, 10 days).
That is, as condition 1,
The most recent A-day moving average value of the outside air temperature is less than B ° C. (threshold value B is, for example, 30).
As condition 2,
The moving average value of the indoor unit air suction temperature minus the indoor unit set temperature for the most recent A day is D ° C. (threshold D is, for example, 5) or more.
As condition 3,
The air suction temperature of the indoor unit is E ° C (threshold E is 24, for example) or higher.

If the number of days that satisfy the above three conditions is not more than a predetermined number of times (for example, one day), the process proceeds to step S5, and it is determined that there is no sign of a reduction in the capacity of the air conditioner 2, and the process proceeds to step S8.
On the other hand, if the number of days that simultaneously satisfy the above three conditions is equal to or greater than a predetermined number of times (for example, one day), the process proceeds to step S6, where it is determined that there is a sign of a reduction in the capacity of the air conditioner 2, and in step S7, prevention / maintenance Is displayed on the display means 7 (see FIG. 1), and the warning means 8 (see FIG. 1) is instructed to issue a warning, and the process proceeds to step S8.

  In step S8, the monitoring computer 6 determines whether or not to end the control. If the control is to be ended (YES in step S8), the control is ended as it is, and if the control is not ended (NO in step S8). Returning to step S1, step S1 and the subsequent steps are repeated again.

In the flowchart of FIG. 2, condition 1 in step S4 is a condition provided to prevent misjudgment during extreme heat. That is, since the condition 1 is not satisfied when the heat is extremely high, the conditions 1 to 3 are not satisfied at the same time. Therefore, by the condition 1, it is possible to prevent misjudgment caused by extreme heat.
Under condition 1, “indoor unit suction temperature” due to extreme heat increases (does not satisfy condition 1), satisfies condition 2, and increases “indoor unit suction temperature−indoor unit set temperature” to satisfy condition 3. Even if it is satisfied, it will not be judged as a sign of failure.
Since it is not necessary to determine the following conditions 2 and 3, the control is facilitated by that amount (the control is advanced rapidly).
In other words, by providing this condition, if the number of days when the outside air temperature is less than the threshold B (for example, 30 ° C.) ° C. is not more than a predetermined number of times, it will not be determined as a sign of failure. It is not necessary to make a decision at the next stage, and the control is simplified.

  If the set temperature is unusually low, the condition 2 may be satisfied although the air suction temperature of the indoor unit is not high. In this case, since the condition 3 is not satisfied, it is possible to prevent the erroneous determination that “there is a sign of failure” because the set temperature has been set to an unusually low temperature.

When the conditions 1, 2, and 3 are satisfied at the same time,
1. It is not intense heat (satisfies condition 1)
2. "Indoor unit suction temperature-Indoor unit set temperature" is large (the difference between the set temperature and room temperature is large) (condition 2 is satisfied)
3. “Indoor unit suction temperature” (ie, room temperature) is high (satisfies condition 3) (if any of conditions 3 and 2 is not met, the indoor unit set temperature is not set to an unusually low temperature) ,
Is the case.
In this case, since the air conditioner does not exhibit its performance, it is determined that the temperature in the room does not drop, so there is a high probability that it is a “predictor of failure”.
Therefore, if there are more than a predetermined number of times (for example, one time or one day) within a predetermined period (for example, 10 days) that satisfy the conditions 1, 2, and 3 at the same time, it is determined that “there is a sign of a decrease in air conditioning capacity”.

  In that case, for example, a preventive maintenance routine (not shown) is executed. For example, a maintenance man is contacted, and the maintenance man performs on-site inspections and repairs as necessary.

  FIGS. 3 to 5 show a gas heat pump, which is a type of air conditioner, which acquires the outside air temperature, the air intake temperature of the indoor unit, and the set temperature of the indoor unit approximately once a day by using a remote monitoring system. This is an example of determining a decrease in ability.

FIG. 3 is a graph showing changes in “outside air temperature”, FIG. 4 is a graph showing fluctuations in the moving average value of “indoor unit suction temperature−indoor unit set temperature”, and FIG. 5 is the closest to “indoor unit suction temperature”. The graph which shows the fluctuation | variation of the A-day moving average value is shown, respectively.
Looking at these three types of graphs individually, it is not easy to understand that there is a sign of a decline in the capacity of the air conditioner or a sign of abnormality.
However, according to the illustrated embodiment, it is possible to determine whether there is a sign of a decrease in the capacity of the air conditioner 2 or a sign of abnormality in a form that anyone can understand.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  In the first embodiment of FIG. 1 and FIG. 2, the average of the “outside air temperature” of “a certain period” is less than a predetermined temperature and the “indoor air temperature” of “a certain period” is used as a criterion for determining failure signs. When the value is equal to or higher than the predetermined temperature and the difference between the indoor air temperature and the set temperature for a certain period of time is greater than or equal to the predetermined value, there are more than a predetermined number of days within the predetermined period. In this embodiment, it is determined that “there is a sign”. All of these predetermined temperatures are given uniform values. In this method, failure prediction is determined using an average value of data over a certain period.

On the other hand, in the second embodiment shown in FIGS. 6 to 8, the “diagnostic day” outside air temperature “itself” is lower than a predetermined temperature and the “diagnosis target day” The day when the air temperature “itself” is equal to or higher than the predetermined temperature and the difference “in itself” between the room air temperature and the set temperature on the “day of diagnosis” is equal to or higher than the predetermined temperature difference (predetermined temperature difference) within the predetermined period. This is an embodiment for determining that “there is a sign of failure” when there is more than a predetermined number of days.
Here, these predetermined temperatures are not uniform, and are obtained for each item as follows, with the collected operation state data below.
Predetermined temperature = average value of room temperature over a predetermined period + standard deviation × A (A1)
Predetermined temperature of difference between room temperature and set temperature = Average value of difference between room temperature and set temperature for a predetermined period + standard deviation × A (A2)
The predetermined period in the above-described two formulas is a certain period (see FIG. 7, FIG. 7) when a certain period has passed since the start of the use of the air conditioner (L in FIG. 7, FIG. 8, for example, 365 days). 8 L: For example, 365 days).
On the other hand, if a certain period of time (symbol L in FIGS. 7 and 8, for example, 365 days) has not elapsed since the start of use of the air conditioner, the certain period is the day of diagnosis from the start of use of the air conditioner ( It is a period before a predetermined number of days (symbol D in FIGS. 7 and 8: for example, 10 days) before the diagnosis date).

First, with reference to FIG. 6, the configuration of the second embodiment will be described focusing on differences from the first embodiment of FIG. In FIG. 6, the entire abnormality diagnosis apparatus is denoted by reference numeral 1A.
The control unit 6A of the abnormality diagnosis apparatus 1A calculates the difference between the room temperature and the set temperature, the database 61A for storing data of the outside air temperature, the room temperature, and the set temperature, the room temperature average value calculating means 63 for calculating the average value of the room temperature. Difference calculating means 64, standard deviation calculating means 66 for calculating a standard deviation, and air conditioning capacity decrease determining means 65A for determining whether or not the air conditioning capacity is decreasing.
Here, the standard deviation calculating means 66 is configured to calculate both the standard deviation of the room temperature and the standard deviation in the difference between the room temperature and the set temperature.
About another structure, it is substantially the same as 1st Embodiment.

  Here, “room temperature” and “temperature difference between room temperature and set temperature” are greatly affected by the load (particularly the outside air temperature) applied to the air conditioner. Therefore, only the data collected when the outside air temperature is less than 30 ° C. are extracted for “room temperature” and “temperature difference between room temperature and set temperature” between the diagnosis date and the predetermined period.

Next, an example of the control method of the second embodiment will be described with reference to FIG.
First, in step S11, the room temperature sensor 3 (see FIG. 6) measures the room temperature, the outside air temperature sensor 4 (see FIG. 6) measures the outside air temperature, and the air conditioner operation remote control 5 (see FIG. 6). Refer to the set indoor unit temperature.

  In the next step S12, the room temperature measured in step S11 and the set temperature set by the remote control 5 for operating the air conditioner are transmitted to the remote monitoring computer (server computer) 6 via the network N for remote monitoring. Once read into the database 61A of the computer 6A, the process proceeds to the next step S13.

  In step S13, it is determined whether or not the period from the start of use of the air conditioner to the date of diagnosis has passed for a predetermined period L (for example, 365 days) or more, and if it has passed (YES in step S13). The process proceeds to step S14. If it has not elapsed (NO in step S13), the process proceeds to step S17.

In step S14, in the above formula (A1), “the average value of the room temperature during the predetermined period” is set as the average value of the room temperature collected during the predetermined period L, and “A = 3”. "Temperature" is calculated.
Then, the “average value of the difference between the room temperature and the set temperature during the predetermined period” in the formula (A2) is set as the average value of the difference (temperature difference) between the room temperature and the set temperature collected during the predetermined period L, and “A = 3 ”is calculated as“ predetermined temperature of difference between room temperature and set temperature ”in equation (A2) (step S15).
If the “predetermined temperature” of the formula (A1) and the “predetermined temperature of the difference between the room temperature and the set temperature” of the formula (A2) are calculated, the process proceeds to step S16.

On the other hand, in step S17, in the above formula (A1), the “average value of the room temperature for a predetermined period” is set to D on the diagnosis date (the date on which the ability of the air conditioner has been reduced) from the start of use of the air conditioner. The average value of the room temperature collected during the period up to the previous day (for example, 10 days ago) is used. Then, “predetermined temperature” in equation (A1) is calculated as “A = 3”.
Similarly, for “the average value of the difference between the room temperature and the set temperature for a predetermined period” in the formula (A2), “the period from the start of use of the air conditioner to D days before the diagnosis date (for example, 10 days before)” As the “predetermined period” of A2), an average value of the difference (temperature difference) between the room temperature and the set temperature during that period is obtained. Then, “A = 3” is calculated, and “predetermined temperature of difference between room temperature and set temperature” in equation (A2) is calculated (step S18).
Even when step S13 is NO, if “predetermined temperature” in equation (A1) and “predetermined temperature of difference between room temperature and set temperature” in equation (A2) are calculated, the process proceeds to step S16.

In step S16, it is determined by the air conditioning capability decrease determination means 65A of the control unit 6A whether or not the following conditions 1 to 3 are simultaneously satisfied on the diagnosis date.
Condition 1: the outside air temperature is lower than a first predetermined temperature (for example, 30 ° C.), that is,
Outside air temperature <B ° C. (for example, B = 30).
Condition 2: The room temperature is equal to or higher than a predetermined temperature (see Formula A1).
Room temperature ≧ predetermined temperature (° C.).
Condition 3: The difference between the room temperature and the set temperature is not less than “a predetermined temperature difference between the room temperature and the set temperature” (see Formula A2), that is, a difference between the room temperature and the set temperature ≧ a predetermined difference between the room temperature and the set temperature. Temperature (° C).

If even one item is not satisfied on the date of diagnosis (if one or more of the above conditions 1 to 3 is not satisfied) (NO in step S16), it is determined that there is no sign of a decrease in air conditioning capacity. (Step S19), the process proceeds to Step S22.
On the other hand, if all of the above conditions 1 to 3 are satisfied on the diagnosis date, step S16 is YES), and it is determined that there is a sign of a decrease in air conditioning capacity (step S20), and display / warning is performed by the display means 7 and warning means 8. (Step S21) is performed, and the process proceeds to Step S22.

  In step S22, the control unit 6A determines whether or not to end the control. If completed (YES in step S22), the process is terminated as it is, and if the control is continued (NO in step S22), the process returns to step S11, and steps S11 and after are repeated again.

Next, control according to a modification of the second embodiment will be described with reference to FIGS. 8 and 9.
In the control of FIG. 7, when the “predetermined temperature” in the equation (A1) and the “predetermined temperature of the difference between the room temperature and the set temperature” in the equation (A2) are obtained, a multiplier A that multiplies the standard deviation by one value (A = Only 3) is selected.
On the other hand, in the control shown in FIGS. 8 and 9, two numerical values “3” and “1.6” are selected for A. Then, by selecting two “A”, signs of a decrease in air conditioning capacity are classified into “high emergency level” and “low emergency level”.

Hereinafter, the control method will be described with reference to FIGS.
Here, FIG. 8 and FIG. 9 represent the same control divided into two parts, but this takes into account the difficulty of viewing in a single drawing.
8, step S31 to step S38 are the same as step S21 to step S28 in the control shown in FIG.

In Step S36, when all of the conditions 1 to 3 for determining that the air conditioning capacity is reduced (similar to that described in Step S16 of FIG. 7) are satisfied (YES in Step S36), there is an indication that the air conditioning capacity is reduced. It is determined that the emergency level is high (step S39).
Here, it is determined in step S39 that the urgency is high because the average value of the room temperature or the room temperature is obtained when the “predetermined temperature” and the “predetermined temperature of the difference between the room temperature and the set temperature” are obtained in the above formulas A1 and A2. Since the value added to the difference between the temperature and the set temperature is set to a relatively large value of 3 times the standard deviation, the “predetermined temperature” and the “predetermined temperature of the difference between the room temperature and the set temperature” are also relatively high temperatures. Is calculated. Even if “predetermined temperature” and “predetermined temperature of difference between room temperature and set temperature” are set to a relatively high temperature, satisfying the conditions 2 and 3 in step S36 means that the room temperature on the diagnosis date is satisfied. This is because the temperature difference between the room temperature and the set temperature is far from the normal value.

  If it is determined in step S39 that “there is a sign that the air conditioning capacity is reduced and the emergency level is high”, the process proceeds to step S45 in FIG. 9 to display a warning to that effect.

On the other hand, if one or more of the conditions 1 to 3 are not satisfied in step S36 (NO in step S36), the process proceeds to step S40 in FIG.
Here, as in the control shown in FIG. 7, when one or more of the conditions 1 to 3 are not satisfied, it is not immediately determined that “there is no sign of a decrease in the air conditioning capacity”.

In step S40, “A” in “standard deviation × A” to be added to “average value of room temperature” in the above-described formula A1 is set to “1.6”, for example, and “predetermined temperature of room temperature” is calculated. .
In the above-described formula A2, “A” in “standard deviation × A” to be added to “average value of difference between room temperature and set temperature for a predetermined period” is set to “1.6”, for example. “Predetermined temperature of difference in set temperature” is calculated (step S41).
When calculating “predetermined temperature” and “predetermined temperature of difference between room temperature and set temperature”, the numerical value added to the average value of room temperature or the difference between room temperature and set temperature is multiplied by 1.6 times the standard deviation. , Lower threshold values ("predetermined temperature", "predetermined temperature difference between room temperature and set temperature") than the threshold values used in step S36 ("predetermined temperature", "predetermined temperature difference between room temperature and set temperature") Can be adopted. This closes if it is possible to determine whether or not the urgent situation is low, but it is in a situation where signs of abnormality are recognized.

Then, similarly to step S36, it is determined whether or not all of the determination conditions 1 to 3 for the decrease in air conditioning capability are satisfied (step S42).
However, “predetermined temperature” under condition 2 (room temperature ≧ predetermined temperature (see A1): ° C.), condition 3 (difference between room temperature and set temperature ≧ predetermined temperature between room temperature and set temperature (see A2): ° C.) and The “predetermined temperature of the difference between the room temperature and the set temperature” is lower than the numerical value in step S36.

If even one item is not satisfied on the date of diagnosis (if one or more of the above conditions 1 to 3 in step S42 is not satisfied) (NO in step S42), there is no indication of a decrease in air conditioning capacity. It is determined that there is none (step S43), and the process proceeds to step S46.
If all of the above conditions 1 to 3 are satisfied on the diagnosis date (YES in step S42), it is determined that there is an indication of a decrease in air conditioning capability (step S44). However, in this case, the “predetermined temperature” and the “predetermined temperature that is the difference between the room temperature and the set temperature” that are the threshold values in step S42 are lower than the values in step S36, respectively. However, it is determined that the urgency is low.

  When it is determined that “there is a sign of a decrease in air conditioning capacity” (YES in step S36 and YES in step S42), display / warning (step S45) is performed by the display means 7 and the warning means 8. Proceed to step S46.

  In step S46, the control unit 6A determines whether or not to end the control. If completed (YES in step S46), the process is terminated as it is, and if the control is continued (NO in step S46), the process returns to step S31 in FIG. 8, and step S31 and subsequent steps are repeated again.

  The illustrated embodiment is merely an example, and is not intended to limit the technical scope of the present invention.

The block diagram which shows the structure of 1st Embodiment. The flowchart which showed the abnormality detection method in 1st Embodiment. The graph which shows the change of "outside temperature". The graph which shows the fluctuation | variation of the moving average value of "suction temperature of indoor unit-indoor unit set temperature". The graph which shows the fluctuation | variation of the moving average value of the "indoor unit suction temperature" for the latest A day. The block diagram which shows the structure of 2nd Embodiment. The flowchart which showed an example of control in 2nd Embodiment. The flowchart which showed a part of control which concerns on the modification of 2nd Embodiment. The flowchart which shows the other part of the control shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Abnormality diagnosis apparatus 2 ... Air conditioner 3 ... Indoor temperature sensor 4 ... Outdoor temperature sensor 5 ... Remote controller 6 ... Monitoring computer 7 ... Display means 8 ... Warning means 61 ... Storage means / database 62 ... Outside air temperature moving average value calculating means 63 ... Indoor suction temperature moving average value calculating means 64 ... Difference average value calculating means 65 ... Air conditioning capacity reduction judgment Mean N ... Network

Claims (7)

  Storage means for storing a representative value of the outside air temperature, a representative value of the indoor unit air suction temperature, a representative value of the indoor unit set temperature, a means for calculating an average value of the outside air temperature for a certain period, and an indoor unit air suction for a certain period Means for calculating an average value of the temperature, means for calculating an average value of the difference between the indoor unit air suction temperature and the indoor unit set temperature for a certain period, and a control unit, the control unit comprising an average of the outside air temperature The value is lower than the predetermined temperature, the average value of the difference between the indoor unit air suction temperature and the indoor unit set temperature is equal to or higher than the predetermined temperature, and the average value of the indoor unit air suction temperature is equal to or higher than the predetermined temperature. An air conditioner abnormality diagnosis apparatus configured to perform control to determine that there is an abnormality sign when a certain day is equal to or greater than a predetermined number of days within a predetermined period.   The air conditioner is connected to a remote monitoring system via an information network, and the remote monitoring system includes the storage means, a means for calculating an average value of the outside air temperature for a certain period, and indoor unit air suction for a certain period. Means for calculating the average value of the temperature, means for calculating the average value of the difference between the indoor unit air suction temperature and the indoor unit set temperature for a certain period, and the control means, and via the information network The air conditioner abnormality diagnosis device according to claim 1, configured to acquire a representative value of the outside air temperature, a representative value of the indoor unit air suction temperature, and a representative value of the indoor unit set temperature.   The step of calculating the average value of the outside air temperature for a certain period from the representative value of the outside air temperature, the step of calculating the average value of the indoor unit air suction temperature for a certain period from the representative value of the indoor unit air suction temperature, and the indoor unit air suction The step of calculating the average value of the difference between the indoor unit air suction temperature and the indoor unit set temperature for a certain period using the representative value of the temperature and the representative value of the indoor unit set temperature, and the average value of the outside air temperature is lower than the predetermined temperature A day when the average value of the difference between the indoor unit air intake temperature and the indoor unit set temperature is equal to or higher than the predetermined temperature and the average value of the indoor unit air intake temperature is equal to or higher than the predetermined temperature is within a predetermined period. And calculating the number of days, and if the calculated number of days is less than the predetermined number of days, it is determined that there is no sign of abnormality, and if the calculated number of days is greater than or equal to the predetermined number of days, there is a sign of abnormality. And a step of determining that there is Abnormality diagnosis method of the air conditioner.   The step of calculating the average value of the outside air temperature, the step of calculating the average value of the indoor unit air suction temperature, and the step of calculating the average value of the difference between the indoor unit air suction temperature and the indoor unit set temperature are: It is performed by a remote monitoring system connected to the air conditioner via the information network, and the representative value of the outside air temperature, the representative value of the indoor unit air suction temperature, and the representative value of the indoor unit set temperature are acquired via the information network. The abnormality diagnosis method for an air conditioner according to claim 3.   Storage means for storing a representative value of the outside air temperature, a representative value of the indoor unit air suction temperature, a representative value of the indoor unit set temperature, a standard deviation calculating means, and a means for calculating an average value of the indoor unit air suction temperature for a certain period; A means for calculating an average value of the difference between the indoor unit air suction temperature and the indoor unit set temperature for a certain period, and a control unit, wherein the control unit has an outside air temperature at a time point higher than the first predetermined temperature. The value of the difference between the indoor unit air suction temperature and the indoor unit set temperature at the time is lower than the second predetermined temperature, and the indoor unit air suction temperature at the time is the third predetermined temperature. An abnormality diagnosis device for an air conditioner configured to perform control to determine that there is an abnormality sign when the number of days is equal to or greater than a predetermined number of days within a predetermined period.   Storage means for storing outside air temperature, room temperature, and set temperature; standard deviation calculating means; means for calculating an average value of room temperature for a fixed period; and means for calculating an average value of a difference between room temperature and set temperature for a fixed period And control means, wherein the control means is such that the outside air temperature is lower than the first predetermined temperature, the room temperature is equal to or higher than the second predetermined temperature, and the difference between the room temperature and the set temperature is When the temperature is equal to or higher than the third predetermined temperature, it is determined that there is an abnormality sign, and the second predetermined value is a numerical value obtained by adding a standard deviation value obtained by multiplying an average value of room temperature for a predetermined period by a specific multiplier, The third predetermined temperature is configured to perform control that is a numerical value obtained by adding a standard deviation value obtained by multiplying an average value of a difference between room temperature and a set temperature for a predetermined period by a specific multiplier. Abnormality diagnosis device.   7. An abnormality diagnosis method for an air conditioner using the abnormality diagnosis apparatus according to claim 6, wherein a step of measuring an outside temperature, a step of measuring a room temperature, a step of calculating an average value of the room temperature for a certain period, and a standard deviation of the room temperature Calculating the average difference between the room temperature and the set temperature for a certain period, calculating the standard deviation of the difference between the room temperature and the set temperature, and the outside air temperature from the first predetermined temperature Determining that there is a sign of abnormality when the temperature is low temperature, the room temperature is equal to or higher than the second predetermined temperature, and the difference between the room temperature and the set temperature is equal to or higher than the third predetermined temperature; The second predetermined value is a numerical value obtained by adding a standard deviation value obtained by multiplying an average value of room temperature over a predetermined period by a specific multiplier, and the third predetermined temperature is a room temperature and a set temperature of the predetermined period. It is a numerical value obtained by adding the standard deviation value obtained by multiplying the average value of the difference by a specific multiplier. An air conditioner abnormality diagnosis method characterized by:

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