Monitoring device

Abstract

Provided is a monitoring device with which the degradation state of a secondary battery can be more accurately monitored. A monitoring device is for communicating with the outside and is connected to a control device that controls an elevator cab. The monitoring device comprises: an acquisition unit that calculates, on the basis of the measurement temperatures of a secondary battery measured by a temperature sensor, an average temperature which is the average value of the measured temperatures during a monitoring period from the previous calculation process to the current calculation process; an arithmetic unit that derives a current longevity curve function indicating the relationship of the full charge capacity relative to the operation time of the secondary battery, on the basis of the average temperature, and calculates the current full charge capacity from the current longevity curve function; and a determination unit that provides notification of an alarm when the current full charge capacity calculated by the arithmetic unit is less than an alarm threshold.

Description

Technical Field

[0001] The present disclosure relates to an elevator monitoring device.

Background Art

[0002] Patent Document 1 discloses an elevator monitoring device. The monitoring device is connected to a secondary battery. The monitoring device can estimate and monitor the capacity retention rate in the fully charged state of the secondary battery based on a life curve function that is a relational expression between the operating time and the capacity retention rate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The life curve function changes depending on the corresponding temperature. However, in the monitoring device described in Patent Document 1, the life curve function is a function corresponding to one set environmental temperature. For this reason, the accuracy of monitoring the capacity retention rate in the fully charged state decreases.

[0005] The present disclosure has been made to solve the above problems. An object of the present disclosure is to provide a monitoring device that can more accurately monitor the deterioration state of a secondary battery.

Means for Solving the Problems

[0006] The monitoring device according to the present disclosure is a monitoring device that is connected to a control device for controlling an elevator car and communicates with the outside. An acquisition unit that calculates an average temperature, which is an average value of measured temperatures during a monitoring period from the previous arithmetic processing to the current arithmetic processing, based on the measured temperature of the secondary battery measured by the temperature sensor; An arithmetic unit that derives a current life curve function indicating the relationship between the full charge capacity and the operating time of the secondary battery based on the average temperature, and calculates the current full charge capacity from the current life curve function; A determination unit that notifies a warning when the current full charge capacity calculated by the arithmetic unit is smaller than a warning threshold value. A prediction unit derives a predicted life curve function indicating the relationship between the predicted fully charged capacity predicted for the operating time of the secondary battery, and calculates a predicted replacement operation time, which is the operating time of the secondary battery when the predicted fully charged capacity becomes equal to an exchange threshold value indicating the value at which the secondary battery should be replaced, based on the predicted life curve function. comprises The calculation unit calculates a virtual operation time corresponding to the previous fully charged capacity by substituting the previous fully charged capacity calculated in the previous calculation process into the current life curve function, calculates the current fully charged capacity by substituting the sum of the virtual operation time and the monitoring period into the current life curve function, and associates the current operation time, which is the sum of the previous operation time when the previous calculation process was performed and the monitoring period, with the current fully charged capacity by performing the association calculation for each monitoring period, thereby creating a plurality of correction points in which the operation time and the fully charged capacity calculated by each of the plurality of calculation processes are associated. The prediction unit derives a predicted life curve function such that specified fitting conditions are satisfied for the plurality of correction points. .

Advantages of the Invention

[0007] According to the present disclosure, the current life curve function is derived based on the average value of the temperatures of the secondary battery measured before the arithmetic processing is performed. Therefore, the deterioration state of the secondary battery can be monitored more accurately.

Brief Description of the Drawings

[0008]

Figure 1

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Embodiments for Carrying Out the Invention

[0009] Embodiments for carrying out the present disclosure will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals. Redundant descriptions of such parts will be simplified or omitted as appropriate.

[0010] Embodiment 1. FIG. 1 is a schematic diagram of an elevator device to which the monitoring device in Embodiment 1 is applied.

[0011] In the elevator device 1 of FIG. 1, the hoistway 2 penetrates each floor of the building 3. The machine room 4 is provided directly above the hoistway 2. The hoisting machine 5 is provided in the machine room 4. The main rope 6 is wound around the hoisting machine 5. The car 7 is suspended on one side of the main rope 6 inside the hoistway 2. The counterweight 8 is suspended on the other side of the main rope 6 inside the hoistway 2.

[0012] The control device 9 is provided in the machine room 4. The control device 9 can control the elevator device 1 as a whole. For example, the car 7 moves up and down in response to the rotation of the hoisting machine 5. The control device 9 controls the rotation of the hoisting machine 5. That is, the car 7 is controlled by the control device 9.

[0013] The monitoring device 10 is provided in the machine room 4. The monitoring device 10 is electrically connected to the control device 9. The monitoring device 10 can monitor the state of the elevator device 1 based on the information acquired from the control device 9.

[0014] The information center device 11 is provided at a location away from the building 3. For example, the information center device 11 is provided in a company that maintains the elevator device 1.

[0015] The monitoring device 10 is a device for communicating with the outside via the network 12. For example, the monitoring device 10 can communicate with the information center device 11 via the network 12. In the elevator device 1, a diagnostic operation is periodically performed. For example, the monitoring device 10 transmits the data obtained by the diagnostic operation to the information center device 11 via the network 12.

[0016] For example, the monitoring device 10 receives power supply from a commercial power supply (not shown). Further, the monitoring device 10 includes a battery 13 as a backup power supply. The battery 13 is a secondary battery. In the event of an emergency such as a power outage of the commercial power supply, the battery 13 can supply power to the monitoring device 10. Normally, the battery 13 is basically in a fully charged state by trickle charging from the commercial power supply.

[0017] Further, the monitoring device 10 includes a temperature sensor 14. The temperature sensor 14 measures the ambient temperature around the monitoring device 10. The ambient temperature around the monitoring device 10 can be regarded as the temperature near the battery 13. The ambient temperature around the monitoring device 10 can be regarded as the temperature of the battery 13. Note that the temperature sensor 14 may be provided adjacent to the battery 13.

[0018] Generally, the battery 13 deteriorates over time. In this case, in the battery 13, the full charge capacity, which is the capacity of the battery in the fully charged state, decreases over time. When the full charge capacity falls below a specified replacement threshold value, the battery 13 needs to be replaced.

[0019] The monitoring device 10 monitors the full charge capacity based on the measured temperature of the temperature sensor 14 and the operating time elapsed since the battery 13 was installed. For example, the monitoring device 10 detects that the full charge capacity has fallen below a warning threshold that is greater than the replacement threshold. In this case, the monitoring device 10 notifies the information center device 11 of a warning prompting the planning of the replacement of the battery 13. Also, thereafter, when the monitoring device 10 detects that the full charge capacity has fallen below the replacement threshold, it notifies the information center device 11 that the battery 13 should be replaced.

[0020] Next, the monitoring device 10 will be described with reference to FIG. 2. FIG. 2 is a block diagram of the monitoring device according to Embodiment 1.

[0021] As shown in FIG. 2, the monitoring device 10 includes a battery 13 that is a power storage unit, a temperature sensor 14 that is a measurement unit, a storage unit 15, a communication unit 16, an input unit 17, and a life monitoring unit 18.

[0022] For example, the storage unit 15 is a storage medium such as a RAM, ROM, flash memory, EPROM, EEPROM, etc. A program for realizing each function of the monitoring device 10 is stored in the storage unit 15. Information necessary for the operation of the monitoring device 10 is stored in the storage unit 15. Information acquired from the control device 9 is stored in the storage unit 15.

[0023] The communication unit 16 is an interface for communication with the outside. The communication unit 16 can communicate with the control device 9. The communication unit 16 can communicate with the information center device 11 via the network 12.

[0024] The input unit 17 is a reception plug for analog. The input unit 17 can take in the signal from the temperature sensor 14. For example, the input unit 17 takes in the analog signal from the temperature sensor 14 as information on the measured temperature by analog-digital conversion. The input unit 17 samples the signal from the temperature sensor 14 at a prescribed period and takes it in as information on the measured temperature.

[0025] The period at which the capture unit 17 samples is arbitrarily set. For example, sampling is performed twice a day.

[0026] The arithmetic unit is provided in the monitoring device 10. The arithmetic unit includes a processing circuit such as a processor. The processing circuit includes a program counter, an instruction register, etc. for controlling operations. The processing circuit includes general-purpose registers, adders, etc. that actually execute operations. The processing circuit of the arithmetic unit realizes each function of the monitoring device 10 by executing programs and the like stored in the storage unit 15.

[0027] The life monitoring unit 18 is a part of the functions of the arithmetic unit. The life monitoring unit 18 includes an acquisition unit 20, an arithmetic unit 21, a determination unit 22, and a prediction unit 23. The life monitoring unit 18 realizes an algorithm for battery life correction through the operations of each unit. In the battery life correction algorithm, the monitoring period is set as the length of one cycle, and arithmetic processing is performed. That is, after the monitoring period has elapsed since the previous arithmetic processing, the current arithmetic processing is performed by the life monitoring unit 18. The monitoring period can be set to any period. For example, the monitoring period is one week. It is desirable that the monitoring period be shorter than one month.

[0028] The acquisition unit 20 acquires information on the measured temperature from the capture unit 17. Note that the acquisition unit 20 may sample the signal from the temperature sensor 14 at a prescribed period with respect to the capture unit 17. The acquisition unit 20 stores the information on the measured temperature in the storage unit 15. Every time the monitoring period elapses, the acquisition unit 20 calculates the average value of the measured temperatures stored in the storage unit 15 and calculates the average temperature T. That is, the average temperature T is the average value of the temperatures measured by the temperature sensor 14 during the monitoring period between the previous arithmetic processing and the current arithmetic processing.

[0029] The arithmetic unit 21 performs various arithmetic operations in the battery life correction algorithm. Specifically, the arithmetic unit 21 derives a life curve function based on the following formula (1), which is a basic formula stored in the storage unit 15. The life curve function is a function showing the relationship between the fully charged capacity and the operating time of the battery 13.

[0030] [Number]

[0031] The life curve function is a function that determines the full charge capacity Q. The full charge capacity is the same as the capacity retention rate of the battery 13. The closer the value of the full charge capacity Q is to 1, the longer the life of the battery 13. In equation (1), the temperature T is the temperature of the battery 13. The temperature T corresponds to the average temperature T in this embodiment. The unit of temperature is [°C]. H p is the operating time elapsed since the battery 13 was installed. The operating time H p is also simply represented as H. A and B are constants specific to the type of the battery 13.

[0032] Before the battery 13 is installed, a high-temperature accelerated degradation test is performed on a battery of the same type as the battery 13. The values of the constants A and B are determined by the high-temperature accelerated degradation test. When the battery 13 is installed, the storage unit 15 stores information on the values of the constants A and B.

[0033] The calculation unit 21 derives the life curve function by substituting the constants A, B, and the temperature T into equation (1). For example, in the i-th calculation process, the calculation unit 21 substitutes the constants A, B, and the i-th average temperature T i into equation (1) to derive the i-th life curve function.

[0034] The calculation unit 21 can calculate the full charge capacity Q corresponding to the operating time H by substituting the operating time H into the life curve function. Also, the calculation unit 21 can calculate the corresponding operating time H by substituting the full charge capacity Q into the life curve function.

[0035] The calculation unit 21 calculates the virtual operation time H' by substituting the full charge capacity in the previous calculation process into the life curve function in the current calculation process. The virtual operation time H' is a virtual operation time calculated by substituting a full charge capacity equal to the full charge capacity in the previous calculation process into the life curve function in the current calculation process. By substituting the value obtained by adding the monitoring period to the virtual operation time H' into the life curve function in the current calculation process, the current full charge capacity, which is the result of the degradation of the full charge capacity at the average temperature from the previous calculation process to the current calculation process, can be calculated.

[0036] Also, the calculation unit 21 calculates the current operation time by adding the previous operation time and the monitoring period. The calculation unit 21 creates information on the current correction point associating the current operation time and the current full charge capacity, and stores it in the storage unit 15. The calculation unit 21 creates information on the correction point for each calculation process and stores it in the storage unit 15.

[0037] The determination unit 22 determines whether the current full charge capacity is less than the warning threshold value. The determination unit 22 determines whether the current full charge capacity is less than the replacement threshold value. The determination unit 22 transmits a notification to the information center device 11 via the communication unit 16 according to the determination result.

[0038] The prediction unit 23 derives a predicted life curve based on the information on a plurality of correction points stored in the storage unit 15. The prediction unit 23 calculates the predicted operation time when the predicted full charge capacity shown in the predicted life curve falls below the replacement threshold value. The prediction unit 23 calculates the predicted remaining life, which is the period until the predicted operation time is reached.

[0039] Next, an algorithm for life correction will be described with reference to FIGS. 3 to 5. FIGS. 3 to 5 are graphs for explaining the algorithm executed by the monitoring device in the first embodiment.

[0040] Figures 3 to 5 show graphs representing the full charge capacity Q with respect to the operating time H of the battery 13. The unit of the operating time H on the horizontal axis is [year]. The unit of the full charge capacity Q is [%], which is a percentage with the full charge capacity Q of the battery in the non-operating state being 100%. That is, it is the value obtained by expressing the right side of formula (1) as a percentage. Note that the units of the operating time H and the full charge capacity Q may be any units as long as they correspond to formula (1). The graph shows a straight line L indicating the replacement threshold. A1 is shown. For example, the replacement threshold is 32%.

[0041] As shown in Figure 3, in the life correction algorithm, first, the calculation unit 21 derives a reference life curve L0. The reference life curve L0 is the curve shown by the reference life curve function obtained by substituting the reference temperature of 40°C into equation (1).

[0042] After that, the life monitoring unit 18 calculates a correction point P at regular intervals ΔH. The correction point P is represented by a tuple (H, Q) of the operating time H and the full charge capacity Q. The correction point P can be represented as a point on the graph in Figures 3 to 5. Hereinafter, the correction point calculated at the i-th time is also referred to as P i . H i and Q i correspond to P i respectively. Figure 3 shows the i-th correction point P i (H i , Q i ).

[0043] Although not shown, when calculating the first correction point P1, the calculation unit 21 calculates the full charge capacity Q1 by substituting the operating time H1 into the reference life curve function. For example, the operating time H1 is equal to ΔH. Note that when calculating the first correction point P1, the calculation unit 21 may derive the first life curve function L1 based on the average temperature T1 measured during the monitoring period O1 from the start of operation to the calculation of the first correction point P1. In this case, the calculation unit 21 may calculate Q1 by substituting H1 into the first life curve function L1.

[0044] As shown in FIG. 4, the life monitoring unit 18 uses the information of the previous correction point P stored in the storage unit 15 to calculate the current correction point P which is the (i + 1)-th correction point. i i+1

[0045] First, the acquisition unit 20 calculates the current average temperature T from the temperature measured during the monitoring period O between the i-th operation and the (i + 1)-th operation. i+1 i+1 i+1 By substituting the current average temperature T into the basic life curve function, the (i + 1)-th life curve function L which is the current life curve function is derived. i+1

[0046] After that, the calculation unit 21 derives the i-th virtual correction point P' which is the previous virtual correction point. Specifically, the calculation unit 21 substitutes the previous full charge capacity Q into the current life curve function L to calculate the previous virtual operation time H', and derives the i-th virtual correction point P'(H', Q) which is the previous virtual correction point. That is, the i-th virtual correction point P' is the point on the (i + 1)-th life curve having the same full charge capacity Q as the correction point P. i i+1 i i i i i i i i

[0047] After that, the calculation unit 21 substitutes H'+ΔH obtained by adding the length ΔH of the monitoring period O to the virtual operation time H' into the life curve function L to calculate the (i + 1)-th full charge capacity Q which is the current full charge capacity. The calculation unit 21 calculates the (i + 1)-th operation time H obtained by adding ΔH to the previous operation time H as the current operation time. In this way, the calculation unit 21 calculates the current correction point P(H, Q). i i+1 i i+1 i+1 i i+1 i+1 i+1 i+1 ​​​​​​​​​​​​​​​​​​​​​​​​Perform the calculation. The calculation unit 21 stores the information of the current correction point P i+1 in the storage unit 15.

[0048] After that, the determination unit 22 determines that the full charge capacity Q i+1 is equal to or greater than the warning threshold.

[0049] Note that the process shown in FIG. 4 can be regarded as a process of translating the line segment connecting the points Pi'(H i ', Q i ) and the point (H i '+ΔH, Q i+1 ) parallel to the axis of the operation time until the correction point P i and deriving P i from P i+1 .

[0050] As shown in FIG. 5, after the cycle ΔH has elapsed, the life monitoring unit 18 calculates the (i + 2)-th correction point P i+2 as the current correction point. In this case, the life monitoring unit 18, in the same manner as the operation shown in FIG. 4, derives the average temperature T i+2 , the life curve function L i+2 , the virtual correction point P i+1 ', the full charge capacity Q i+2 and the correction point P i+2 respectively. At this time, the life monitoring unit 18 regards the (i + 1)-th correction point P i+1 as the previous correction point, and performs the calculation regarding H i+1 and Q i+1 as the previous operation time and the previous full charge capacity.

[0051] Next, with reference to FIGS. 6 and 7, the operation of notifying a warning and calculating the remaining life from a plurality of correction points will be described. FIG. 6 is a graph showing a plurality of correction points calculated by the monitoring device in the first embodiment. FIG. 7 is a graph showing a plurality of correction points calculated by the monitoring device in the first embodiment and the predicted life curve.

[0052] FIG. 6 shows an example of the result of repeating the life correction algorithm. The correction line L nis a line schematically showing a line segment connecting a plurality of correction points calculated by a life correction algorithm. Correction line L n can be regarded as a line obtained by correcting the reference life curve L0 based on the actual average temperature.

[0053] Point A1 is a point on the correction line L n where the full charge capacity becomes the replacement threshold. That is, point A1 is the intersection of the correction line L n and the straight line L A1 indicating the replacement threshold. The operating time H A1 corresponding to point A1 is the life obtained by the life correction algorithm.

[0054] Point A2 is a point on the correction line L n where the full charge capacity becomes the warning threshold. For example, the warning threshold is set to 40%. The operating time H A2 corresponding to point A2 is the warning time obtained by the life correction algorithm. For example, the difference between the operating time H A1 and H A2 is the actually measured remaining life. The actually measured remaining life is the remaining period until the life is reached after the monitoring device 10 issues a warning to prompt the replacement of the battery 13.

[0055] Point B is the intersection of the reference life curve L0 and the straight line L A1 That is, the operating time corresponding to point B is the operating time when the replacement should have been performed if the life was predicted by the reference life curve L0. In this example, the difference between the operating time corresponding to point B and the operating time H A1 is about 2 years. That is, under the installation conditions of this example, it is shown that the battery 13 can be used about 2 years longer by monitoring based on the life correction algorithm compared to the case based on the reference life curve L0.

[0056] Note that, different from this example, depending on the installation conditions of the monitoring device 10, the operating time H A2 may be shorter than the operating time corresponding to point B. In this case, it means that the battery 13 is replaced at a safer replacement time.

[0057] In FIG. 7, a predicted life curve L E is further shown. The predicted life curve L E is an approximate curve calculated so that the specified fitting conditions are satisfied for a plurality of correction points.

[0058] For example, when the k-th full charge capacity Q k falls below the warning threshold, the determination unit 22 notifies a warning. At this time, the prediction unit 23 starts a process of deriving the predicted life curve L E

[0059] In this process, first, the prediction unit 23 acquires a plurality of correction points P1 to P K from the first to the k-th stored in the storage unit 15. Based on the function fitting method, the prediction unit 23 derives a curve that satisfies specified conditions such as the distance from a plurality of correction points P1 to P K in the coordinate system shown in FIG. 7 being within a specified distance, and sets it as the predicted life curve L E

[0060] For example, the prediction unit 23 derives the predicted life curve L E by deriving each constant and coefficient that satisfy the specified conditions for a function such as Equation (1). Note that the prediction unit 23 may derive the predicted life curve L E using a combined function form such as a trigonometric function or a power series function instead of the function form of Equation (1).

[0061] The prediction unit 23 applies the predicted life curve L E to a region where the operating time is longer than that of a plurality of correction points P1 to P K and derives the intersection point E between the predicted life curve L E and the straight line L A1 . That is, the prediction unit 23 calculates the predicted replacement operation time H E at which the full charge capacity becomes the replacement threshold in the predicted life curve L E . The prediction unit 23 calculates the predicted remaining life, which is the difference between the operation time H k corresponding to the correction point P k and the predicted replacement operation time H E .​​

[0062] After that, the prediction unit 23 notifies the information center device 11 of the information on the predicted replacement operation time H E and the information on the predicted remaining life. For example, in the information center device 11, a replacement plan for the battery 13 is formulated based on the information on the predicted replacement operation time H E and the information on the predicted remaining life.

[0063] Note that the prediction unit 23 may derive the predicted life curve L E and the predicted replacement operation time H E at an arbitrary timing, not just when the fully charged capacity falls below the warning threshold. In this case, the prediction unit 23 may derive the predicted life curve L k using the points from the first correction point P1 to the latest correction point P E .

[0064] Next, the operations performed by the monitoring device 10 will be described with reference to FIG. 8. FIG. 8 is a flowchart for explaining the outline of the operations of the monitoring device in the first embodiment.

[0065] For example, the flowchart in FIG. 8 starts after the monitoring device 10 is installed. In step S01, the capture unit 17 waits until the specified sampling period elapses.

[0066] After that, in step S02, the capture unit 17 acquires temperature information from the temperature sensor 14.

[0067] After that, in step S03, the life monitoring unit 18 determines whether the period ΔH has elapsed since the previous arithmetic processing.

[0068] If it is determined in step S03 that the period ΔH has not elapsed, the operations after step S01 are repeated.

[0069] In step S03, when it is determined that the period ΔH has elapsed, the operation of step S04 is performed. In step S04, the acquisition unit 20 calculates the average temperature T during the current monitoring period. i The calculation unit 21 derives the current life curve function based on the average temperature T. i Based on the average temperature T.

[0070] After that, in step S05, the calculation unit 21 calculates the virtual operation time by substituting the previous fully charged capacity into the current life curve function. The calculation unit 21 calculates the previous virtual correction point.

[0071] After that, in step S06, the calculation unit 21 calculates the current fully charged capacity by substituting the sum of the virtual operation time and the monitoring period into the current life curve function. The calculation unit 21 associates the current operation time with the current fully charged capacity and calculates the current correction point. The calculation unit 21 stores the information of the current correction point in the storage unit 15.

[0072] After that, in step S07, the determination unit 22 determines whether the current fully charged capacity is less than the warning threshold.

[0073] In step S07, when it is determined that the current fully charged capacity is equal to or greater than the warning threshold, the operations after step S01 are repeated.

[0074] In step S07, when it is determined that the current fully charged capacity is less than the warning threshold, the operation of step S08 is performed. In step S08, the determination unit 22 determines whether the current fully charged capacity is less than the replacement threshold.

[0075] In step S08, if it is determined that the current full charge capacity is the same as or greater than the replacement threshold, the operation of step S09 is performed. In step S09, the prediction unit 23 derives a predicted life curve function based on a plurality of correction points stored in the storage unit 15. The prediction unit 23 calculates a predicted replacement operation time based on the predicted life curve function and the replacement threshold. The prediction unit 23 calculates a predicted remaining life based on the predicted replacement operation time.

[0076] Thereafter, in step S10, the determination unit 22 notifies the information center device 11 of information indicating the predicted remaining life and a warning to prompt replacement. Thereafter, the operations after step S01 are repeated.

[0077] In step S08, if it is determined that the current full charge capacity is less than the replacement threshold, the operation of step S11 is performed. In step S11, the determination unit 22 notifies the information center device 11 that the battery 13 should be replaced. Thereafter, the operations after step S01 are repeated.

[0078] According to the first embodiment described above, the monitoring device 10 includes an acquisition unit 20, a calculation unit 21, and a determination unit 22. The monitoring device 10 derives the current life curve function based on the average temperature during the monitoring period. The monitoring device 10 calculates the current full charge capacity based on the current life curve function. At this time, the monitoring device 10 calculates a virtual operation time corresponding to the previous full charge capacity by substituting the previous full charge capacity into the current life curve function. The monitoring device 10 calculates the current full charge capacity based on the virtual operation time. The monitoring device 10 compares the current full charge capacity with the warning threshold. Therefore, the deterioration state of the secondary battery, which is the battery 13, can be monitored more accurately. In particular, in the field of elevator devices, the environment where the battery is placed is different for each site. The monitoring device 10 can appropriately monitor the life of the battery for such different environments for each site. In addition, since a warning is notified to the information center device 11, the maintenance company of the elevator device 1 can replace the battery 13 more reliably.

[0079] Furthermore, in the present embodiment, it is possible to calculate a full charge capacity having the same level of accuracy as in the prior art with a smaller amount of calculation than in the prior art. Specifically, there has conventionally been a technique in which a life curve function is derived from a combination of the temperature around the secondary battery, the state of charge (SOC), and the like. However, when deriving this life curve function, it has been necessary to perform complex arithmetic processing such as determining an optimal life curve function from among a plurality of prepared model life curve functions. In the present embodiment, the monitoring device 10 derives a life curve function using a single model formula such as formula (1). That is, the full charge capacity can be calculated with a smaller amount of calculation than in the prior art while having the same level of accuracy as these conventional techniques.

[0080] In addition, the monitoring device 10 further includes a prediction unit 23. The monitoring device 10 derives a predicted life curve function such that specified fitting conditions are satisfied for a plurality of correction points. Here, the plurality of correction points are points at which the measured operating time and the full charge capacity calculated each time arithmetic processing is performed based on the average temperature are associated with each other. Therefore, a function for predicting the life more accurately can be derived.

[0081] In addition, the monitoring device 10 calculates a predicted operating time and calculates a predicted remaining life. Therefore, the information center device 11 can formulate a battery 13 replacement plan based on more accurate calculations.

[0082] Note that the monitoring device 10 may be applied to an elevator device in which there is no machine room and a control device or the like is provided inside the hoistway.

[0083] Note that the monitoring device 10 may operate in the same manner to monitor the life of a secondary battery provided inside the hoistway 2 or inside the machine room 4 instead of the battery 13.

Industrial Applicability

[0084] As described above, the monitoring device according to the present disclosure can be used in an elevator device.

Explanation of Signs

[0085] 1 Elevator device, 2 Hoistway, 3 Building, 4 Machine room, 5 Hoisting machine, 6 Main rope, 7 Car, 8 Counterweight, 9 Control device, 10 Monitoring device, 11 Information center device, 12 Network, 13 Battery, 14 Temperature sensor, 15 Storage unit, 16 Communication unit, 17 Acquisition unit, 18 Life monitoring unit, 20 Acquisition unit, 21 Calculation unit, 22 Judgment unit, 23 Prediction unit, 40 Reference temperature, LE Predicted life curve, Li Life curve function, Ln Correction line, Pi Correction point

Claims

1. A monitoring device connected to a control device for controlling an elevator car and communicating with the outside, An acquisition unit that calculates an average temperature, which is an average value of the measured temperature during a monitoring period from a previous calculation process to a current calculation process, based on the measured temperature of the secondary battery measured by a temperature sensor; A calculation unit that derives a current life curve function indicating the relationship between the full charge capacity and the operating time of the secondary battery based on the average temperature, and calculates the current full charge capacity from the current life curve function; A determination unit that notifies a warning when the current full charge capacity calculated by the calculation unit is less than a warning threshold; A prediction unit that derives a predicted life curve function indicating the relationship between the predicted full charge capacity and the operating time of the secondary battery, and calculates a predicted replacement operating time, which is the operating time of the secondary battery when the predicted full charge capacity becomes equal to a replacement threshold indicating a value at which the secondary battery should be replaced, based on the predicted life curve function; comprising The calculation unit calculates a virtual operating time corresponding to the previous full charge capacity by substituting the previous full charge capacity calculated in the previous calculation process into the current life curve function, and calculates the current full charge capacity by substituting the sum of the virtual operating time and the monitoring period into the current life curve function, creates a plurality of correction points in which the operating time and the full charge capacity calculated by each of a plurality of calculation processes are associated by performing, for each monitoring period, an operation of associating the current operating time, which is the sum of the previous operating time when the previous calculation process was performed and the monitoring period, with the current full charge capacity, The prediction unit derives the predicted life curve function such that a specified fitting condition is satisfied for the plurality of correction points. Monitoring device.

2. The monitoring device according to claim 1, wherein the prediction unit calculates a predicted remaining life until the predicted replacement operation time when the determination unit determines that the current full charge capacity is smaller than the warning threshold value.

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