Refrigerator management method, refrigerator management device, and refrigerator management system

Abstract

A refrigerator management method according to one aspect of the present invention includes: a first acquisition step (step S201) for acquiring log information including temperature information indicating the temperature in a refrigerator and opening / closing information indicating whether or not the door of the refrigerator has been opened / closed; a calculation step (step S202) for estimating the change over time in the temperature in the refrigerator for the case where the door is opened / closed during a predetermined period and the case where the door is not opened / closed during the predetermined period on the basis of the log information; and an output step (step S203) for outputting result information indicating the result of calculation in the calculation step.

Description

[Technical field]

[0001] The present invention relates to a refrigerator management method, a refrigerator management device, a refrigerator management system, and a temperature calculation method. [Background technology]

[0002] Conventionally, there is a technique for predicting the date and time when the temperature inside a refrigerator will rise to a predetermined temperature when an abnormality occurs in the refrigerator (see, for example, Patent Documents 1 and 2). According to the techniques disclosed in Patent Documents 1 and 2, a user of a refrigerator can determine whether the condition of food stored inside the refrigerator will deteriorate before the refrigerator is repaired.

[0003] There is also a technique for predicting a failure of a refrigerator based on log information, which is information about the temperature inside the refrigerator and the like, stored in the refrigerator (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-137747 [Patent Document 2] International Publication No. 2018 / 116520 [Patent Document 3] International Publication No. 2014 / 171119 Summary of the Invention [Problem to be solved by the invention]

[0005] For example, when an abnormality occurs in a refrigerator and the cooling function of the refrigerator stops, it is required to accurately predict the temperature inside the refrigerator.

[0006] The present invention provides a refrigerator management method and the like that can accurately predict the temperature inside a refrigerator. [Means for solving the problem]

[0007] A refrigerator management method according to one embodiment of the present invention includes a first acquisition step of acquiring log information including temperature information indicating a temperature inside a refrigerator and opening / closing information indicating whether a door of the refrigerator has been opened or closed; a calculation step of calculating, based on the log information, a change in temperature inside the refrigerator over time when the door is opened and closed within a specified period and when the door is not opened or closed within the specified period; and an output step of outputting result information indicating a calculation result calculated in the calculation step.

[0008] In addition, a refrigerator management device according to one embodiment of the present invention includes an acquisition unit that acquires log information including temperature information indicating a temperature inside a refrigerator and opening / closing information indicating whether a door of the refrigerator has been opened or closed, a calculation unit that calculates a change in temperature inside the refrigerator over time in cases where the door has been opened and closed and in cases where it has not been opened or closed based on the log information acquired by the acquisition unit, and an output unit that outputs result information indicating a calculation result calculated by the calculation unit.

[0009] Further, a refrigerator management system according to one aspect of the present invention includes a refrigerator, a refrigerator management device capable of communicating with the refrigerator, and a terminal device capable of communicating with the refrigerator management device, wherein the refrigerator has a detection unit that detects log information including temperature information indicating a temperature inside the refrigerator and open / close information indicating whether a door of the refrigerator has been opened or closed, and a transmission unit that transmits the log information detected by the detection unit to the refrigerator management device, the refrigerator management device has an acquisition unit that acquires the log information transmitted from the transmission unit, a calculation unit that calculates a change over time in the temperature inside the refrigerator when the door is opened and closed and when it is not opened based on the log information acquired by the acquisition unit, and an output unit that outputs result information indicating a calculation result calculated by the calculation unit, and the terminal device has a notification unit that notifies of the calculation result based on the result information output from the output unit.

[0010] Furthermore, a temperature calculation method according to one aspect of the present invention includes a first acquisition step of acquiring log information including temperature information indicating a temperature inside a refrigerator equipped with a compressor, compressor operation information indicating an operating state of the compressor, and opening / closing information indicating whether a door of the refrigerator has been opened or closed, and a calculation step of calculating a change over time in the temperature inside the refrigerator based on a change in the temperature information when the compressor operation information included in the log information indicates a stopped state of the compressor.

[0011] Furthermore, these comprehensive or specific aspects may be realized by a system, a method, an integrated circuit, a computer program, or a computer-readable recording medium such as a CD-ROM, or may be realized by any combination of the system, the method, the integrated circuit, the computer program, and the recording medium. Effect of the Invention

[0012] According to the present invention, it is possible to provide a refrigerator management method and the like that can accurately predict the temperature inside a refrigerator. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram showing a schematic configuration of a refrigerator management system according to an embodiment. [Diagram 2] FIG. 2 is a block diagram showing a functional configuration of the refrigerator according to the embodiment. [Diagram 3] FIG. 3 is a block diagram showing a functional configuration of the refrigerator management device according to the embodiment. [Figure 4] FIG. 4 is a block diagram illustrating a functional configuration of a terminal device according to the embodiment. [Diagram 5] FIG. 5 is a table illustrating an example of log information detected by the refrigerator according to the embodiment. [Figure 6] FIG. 6 is a graph showing an example of log information detected by the refrigerator according to the embodiment. [Figure 7] FIG. 7 is a graph showing an example of a calculated value of a temperature change inside the refrigerator calculated by the refrigerator management device according to the embodiment. [Figure 8] FIG. 8 is a diagram illustrating an example of an image showing a calculation result of the temperature inside the refrigerator, which is displayed on the terminal device according to the embodiment. [Figure 9] FIG. 9 is a sequence diagram showing a process procedure executed by the refrigerator management system according to the embodiment. [Figure 10] FIG. 10 is a flowchart showing a processing procedure of the calculation processing executed by the refrigerator management device according to the embodiment. [Figure 11] FIG. 11 is a flowchart showing a processing procedure of the acquisition process executed by the refrigerator management device according to the embodiment. [Figure 12] FIG. 12 is a diagram showing a first example of a modified example of an image showing a calculation result of the temperature inside the refrigerator displayed on the terminal device according to the embodiment. [Figure 13] FIG. 13 is a diagram showing a second example of a modified image showing a calculation result of the temperature inside the refrigerator displayed on the terminal device according to the embodiment. [Figure 14] FIG. 14 is a diagram showing a third example of a modified example of an image showing a calculation result of the temperature inside the refrigerator displayed on the terminal device according to the embodiment. [Figure 15] FIG. 15 is a flowchart showing a temperature calculation method according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, a home appliance control system according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that each of the embodiments described below shows a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement and connection of the components, steps and the order of steps shown in the following embodiments are merely examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, components that are not described in the independent claims showing the highest concept of the present invention will be described as optional components.

[0015] In addition, each drawing is a schematic diagram and is not necessarily a precise illustration. In addition, in each drawing, the same components are denoted by the same reference numerals.

[0016] (Embodiment) [composition] First, the configuration of a refrigerator management system according to an embodiment will be described with reference to Figs. 1 to 4.

[0017] <Overview of the refrigerator management system> FIG. 1 is a schematic diagram showing a schematic configuration of a refrigerator management system 100 according to an embodiment.

[0018] The refrigerator management system 100 includes a refrigerator 200, a refrigerator management device 300, and a terminal device 400. The refrigerator 200, the refrigerator management device 300, and the terminal device 400 are connected to each other so as to be able to communicate with each other via a network 500 such as the Internet.

[0019] The refrigerator management system 100 may include a router or the like for communication between the refrigerator 200, the refrigerator management device 300, and the terminal device 400. The refrigerator 200 and the terminal device 400 may be connected to each other via a LAN (Local Area Network) or the like so as to be able to communicate with each other, or may not be able to communicate with each other directly. When the refrigerator 200 and the terminal device 400 communicate with each other via a LAN, the communication standard employed is not particularly limited. Examples of the communication standard include Wi-Fi (registered trademark), Bluetooth (registered trademark), and ZigBee (registered trademark). The refrigerator 200 is disposed, for example, in a house 600 in which a user lives. The refrigerator management device 300 is disposed, for example, outside the house 600.

[0020] For example, when refrigerator 200 breaks down and the cooling function of refrigerator 200 stops, the temperature inside refrigerator 200 starts to rise gradually. When food items such as vegetables are stored inside refrigerator 200 and the food items are left for a long time, the temperature inside refrigerator rises and the food items deteriorate faster than when refrigerator 200's cooling function is maintained. The degree of deterioration of food items differs depending on the temperature inside refrigerator. Therefore, by knowing the temperature inside refrigerator 200 when the cooling function has stopped, a user can determine whether to consume the food items stored inside refrigerator 200 or to continue storing the food items since repairs can be made in time.

[0021] Refrigerator management system 100 is a system in which refrigerator management device 300 calculates (estimates) a change in temperature over time (also referred to as a temperature change) inside refrigerator 200 based on log information of refrigerator 200 detected by refrigerator 200, and notifies a user of the calculation result (calculation result) via terminal device 400 used by the user. More specifically, refrigerator management system 100 calculates the change in temperature over time inside refrigerator 200 for each of a case in which door 280 (see FIG. 2) of refrigerator 200 is not opened or closed within a predetermined period and a case in which door 280 is opened or closed within the predetermined period.

[0022] The predetermined period may be arbitrarily determined in advance, or may be set by the user.

[0023] In the following description, "door 280 is opened and closed" refers to an operation in which door 280 is opened and then closed, based on a basic state in which door 280 of refrigerator 200 is closed. "Door 280 is not opened and closed" refers to a state in which door 280 continues to be closed.

[0024] The log information is data related to processes (operations) performed by the refrigerator 200 and operations performed by a user on the refrigerator 200. The log information may include various information that can be acquired from the refrigerator 200, such as information indicating the operating status or operation date and time of the refrigerator 200.

[0025] In this specification, a user is a user of terminal device 400, in other words, a user who uses refrigerator management system 100 to check the calculation results of refrigerator management device 300. Specifically, a user is a user who uses refrigerator management system 100 to receive analysis results of log information by refrigerator management device 300, etc. For example, in an ordinary household, the head of the household who has a service contract with a business that manages refrigerator management system 100 is the user. Also, for example, in business use, a company, a corporation, or a natural person who has a service contract with a business that manages refrigerator management system 100 is the user. Also, for example, in an ordinary household, the user and the user's family are the owners of refrigerator 200 for which log information is provided, and are also users of refrigerator 200. The user and the user of the refrigerator may be different persons. In this embodiment, the user and the user of refrigerator 200 are the same person.

[0026] In addition, although FIG. 1 shows one refrigerator 200 and one terminal device 400, the number of refrigerators 200 and the number of terminal devices 400 provided in the refrigerator management system 100 are not particularly limited, and may be more than one.

[0027] The configurations of the refrigerator 200, the refrigerator management device 300, and the terminal device 400 will be described in detail below.

[0028] <Refrigerator> FIG. 2 is a block diagram showing a characteristic functional configuration of a refrigerator 200 according to an embodiment.

[0029] The refrigerator 200 is a storage that can store food and the like in at least one of a refrigerated temperature zone and a freezer temperature zone. The refrigerator 200 includes a measuring unit 210, a detecting unit 220, a detecting unit 230, a transmitting unit 240, a memory unit 250, and a power supply unit 290. The refrigerator 200 also includes a storage chamber 270 in which food and the like are stored, and an openable and closable door 280 for putting food and the like in and taking it out of the inside of the storage chamber 270 (also referred to as the inside of the refrigerator). The refrigerator 200 also includes a cooling unit for cooling the inside of the refrigerator. The cooling unit may be a Peltier element or the like, but is a compressor 260 in this embodiment. The refrigerator 200 also includes a power supply unit 290 that is electrically connected to each device, such as the compressor 260, included in the refrigerator 200 by a power line or the like, and supplies power to each device.

[0030] Measurement unit 210 measures log information of refrigerator 200. As described above, log information includes various information that can be acquired from refrigerator 200. Specifically, log information includes at least temperature information indicating the temperature inside refrigerator 200 linked to the time, and opening / closing information indicating the timing when door 280 of refrigerator 200 is opened and closed. In this embodiment, log information includes (i) date and time information indicating the date and time when measurement unit 210 acquired log information, (ii) inside temperature information indicating the temperature inside the refrigerator linked to the date and time, (iii) outside temperature information indicating the temperature outside the refrigerator (more specifically, the outside air temperature around refrigerator 200) linked to the date and time, (iv) storage amount information indicating the storage amount linked to the date and time, (v) compressor operation information indicating the operation state of compressor 260 linked to the date and time, and (vi) opening / closing information indicating the opening / closing state of door 280 linked to the date and time (in other words, opening / closing information indicating the timing when door 280 of refrigerator 200 is opened and closed).

[0031] The log information may include malfunction detection result information indicating a malfunction state of refrigerator 200 linked to the date and time, and power supply information indicating a power supply state to refrigerator 200 linked to the date and time. For example, the log information may include malfunction information indicating at least one of a fact that a malfunction of refrigerator 200 has been detected and a fact that power is not being supplied to refrigerator 200.

[0032] In this embodiment, the detection unit 220 detects the malfunction state of the refrigerator 200 and the state of power supply to the refrigerator 200.

[0033] In the following description, the malfunction state of the refrigerator 200 and the state of power supply to the refrigerator 200 detected by the detection unit 220 may be referred to as log information, including the detection results.

[0034] The measurement unit 210 includes a rotation speed measurement unit 211, a storage amount measurement unit 212, a door opening / closing measurement unit 213, an inside temperature measurement unit 214, and an outside temperature measurement unit 215.

[0035] The rotation speed measurement unit 211 measures the rotation speed of the rotor of the compressor 260, which is a cooling unit for compressing a refrigerant for cooling the storage chamber 270, more specifically, for cooling the inside of the chamber. The rotation speed measurement unit 211 includes, for example, a sensor for measuring the rotation speed per unit time (for example, one second) of the rotor of the compressor 260. The rotation speed measurement unit 211 outputs data indicating the measured rotation speed per unit time to the failure detection unit 221 and the detection unit 230 as compressor operation information indicating the operation state of the compressor 260.

[0036] The compressor operation information does not have to be the number of rotations of the rotor per unit time. For example, the compressor operation information may be information indicating a frequency at which the rotor is rotated, information indicating a rotation speed of the rotor, or the like. In this case, refrigerator 200 may include a sensor for measuring the information indicating the frequency at which the rotor is rotated, the rotation speed of the rotor, or the like.

[0037] The storage amount measuring unit 212 measures the amount of items (e.g., food products) stored in the fridge. The storage amount measuring unit 212 includes, for example, a light source such as an LED (Light Emitting Diode) and an optical sensor that detects light. The storage amount measuring unit 212 is, for example, disposed in the fridge, and measures the amount of storage in the fridge based on the ratio of the amount of light detected by the optical sensor to the amount of light emitted from the light source. The storage amount measuring unit 212 classifies the storage amount into predetermined stages (e.g., five stages from 1 to 5) based on the ratio, for example, and outputs data indicating the classification result to the detection unit 230.

[0038] The door opening / closing measurement unit 213 detects whether the door 280 is opened or closed. The door opening / closing measurement unit 213 includes, for example, a piezoelectric sensor. The door opening / closing measurement unit 213 outputs data (opening / closing information) indicating whether the door 280 is opened or closed to the detection unit 230. In this embodiment, the door opening / closing measurement unit 213 outputs "1" to the detection unit 230 when the door 280 is opened, and outputs "0" to the detection unit 230 when the door 280 is closed.

[0039] The inside temperature measuring unit 214 measures the temperature inside the refrigerator. The inside temperature measuring unit 214 is equipped with, for example, a thermometer for measuring the temperature inside the refrigerator. The inside temperature measuring unit 214 outputs data indicating the measured inside temperature (inside temperature information) to the detection unit 230.

[0040] The outside temperature measuring unit 215 measures the temperature outside the refrigerator, more specifically, the temperature of the surroundings outside a housing (not shown) included in the refrigerator 200 (that is, the air temperature of the space in which the refrigerator 200 is installed). The outside temperature measuring unit 215 includes, for example, a thermometer for measuring the temperature outside the refrigerator. The outside temperature measuring unit 215 outputs data (outside temperature information) indicating the measured temperature outside the refrigerator to the detection unit 230. The outside temperature measuring unit 215 is preferably provided on the front side of the refrigerator 200. That is, the outside temperature measuring unit 215 may be provided on a part exposed to the outside of the refrigerator 200 among the lower part of the door of the refrigerator 200 or on the handle of the door. The outside temperature measuring unit 215 (more specifically, a part of the thermometer included in the outside temperature measuring unit 215 that measures the temperature) is provided on the front side of the refrigerator 200 (more specifically, the side where the door of the refrigerator 200 is provided), and is therefore less susceptible to the influence of the compressor 260 compared to the case where the outside temperature measuring unit 215 is provided on the rear side of the refrigerator 200. Therefore, by providing outside temperature measuring unit 215 on the front side of refrigerator 200, the outside temperature can be measured more accurately than when it is provided on the rear side of refrigerator 200.

[0041] The detection unit 220 is a processing unit that detects a malfunction state of the refrigerator 200 and a state of power supply to the refrigerator 200. Specifically, the detection unit 220 detects at least one of a malfunction of the refrigerator 200 and no power supply to the refrigerator 200 (in other words, a stop of power supply). In other words, the detection unit 220 detects whether the refrigerator 200 has lost a cooling function. The detection unit 220 includes, for example, a malfunction detection unit 221 and a power supply detection unit 222.

[0042] The failure detection unit 221 is a processing unit that determines whether or not a cooling mechanism of the refrigerator 200 has a failure, based on the compressor operation information received from the rotation speed measurement unit 211. Specifically, the failure detection unit 221 determines whether or not the compressor 260 has a failure, based on the compressor operation information.

[0043] For example, refrigerator 200 includes a control unit (not shown) which is a processing unit that controls each device included in refrigerator 200, such as compressor 260. For example, the control unit outputs a control signal indicating the rotation speed of compressor 260 to compressor 260. Compressor 260 rotates at a rotation speed determined based on the control signal. Failure detection unit 221 receives a control signal for controlling compressor 260 from the control unit, for example. When the control unit executes control to rotate compressor 260 based on the control signal, that is, when the control unit outputs the control signal to compressor 260, failure detection unit 221 acquires compressor operation information including the rotation speed of compressor 260, and determines whether compressor 260 is rotating according to the rotation speed indicated by the control signal based on the acquired compressor operation information, thereby determining whether compressor 260 is malfunctioning. For example, when compressor 260 rotates according to the rotation speed indicated by the control signal, malfunction detection unit 221 determines that compressor 260 operates normally, that is, that compressor 260 is not malfunctioning, and when compressor 260 does not rotate according to the rotation speed indicated by the control signal, malfunction detection unit 221 determines that compressor 260, that is, refrigerator 200 is malfunctioning.

[0044] The failure detection unit 221 is realized, for example, by a control program stored in the storage unit 250 or the like and a CPU (Central Processing Unit) that executes the control program. The failure detection unit 221 may be realized, for example, by a dedicated circuit or the like.

[0045] The power supply detection unit 222 detects whether or not power is being supplied to each device, such as the compressor 260, included in the refrigerator 200. The power supply detection unit 222 includes, for example, at least one of an ammeter and a voltmeter. The power supply detection unit 222 detects, for example, whether or not power is being supplied from the power supply unit 290 to each device included in the refrigerator 200.

[0046] Detection unit 220 outputs information indicating the detection results detected by failure detection unit 221 and power supply detection unit 222 to detection unit 230. For example, when failure detection unit 221 detects a failure of refrigerator 200 and / or when power supply detection unit 222 detects that no power is being supplied to refrigerator 200, detection unit 220 outputs information indicating at least one of the fact that a failure of refrigerator 200 has been detected and the fact that no power is being supplied to refrigerator 200 to detection unit 230 as failure information.

[0047] Detection unit 230 is a processing unit that detects (in other words, acquires) log information including temperature information indicating the temperature inside refrigerator 200 measured or detected by measurement unit 210 or detection unit 220, opening / closing information indicating whether door 280 of refrigerator 200 has been opened or closed, and malfunction detection result information indicating a malfunction status of refrigerator 200. Specifically, detection unit 230 detects log information output from each unit included in measurement unit 210. Detection unit 230 transmits the detected log information to refrigerator management device 300 via transmission unit 240.

[0048] The detection unit 230 is realized, for example, by a control program stored in the storage unit 250 or the like, and a CPU (Central Processing Unit) that executes the control program. The detection unit 230 may be realized, for example, by a dedicated circuit or the like.

[0049] Detection unit 230 may store the detected log information in storage unit 250. Detection unit 230 may transmit the log information stored in storage unit 250 to refrigerator management device 300 via transmission unit 240 at a predetermined timing.

[0050] Transmission unit 240 is a communication interface for transmitting log information detected by detection unit 230 to refrigerator management device 300. Transmission unit 240 is realized, for example, by a wireless communication circuit in the case of wireless communication, and is realized by a connector connectable to a communication line in the case of wired communication. Detection unit 230 transmits, for example, the detected log information to refrigerator management device 300 via transmission unit 240.

[0051] The detection unit 230 may transmit the log information collectively or may transmit a part of the log information via the transmission unit 240. For example, the detection unit 230 may transmit the temperature information and the open / close information contained in the log information collectively via the transmission unit 240, or may transmit them separately, that is, at different times.

[0052] The storage unit 250 is a storage device that stores control programs executed by the detection unit 230 etc., log information etc. The storage unit 250 is realized by, for example, a hard disk drive (HDD) or a flash memory.

[0053] Compressor 260 is a cooling unit for cooling the interior of the refrigerator. Specifically, compressor 260 is a compressor that compresses and delivers a refrigerant such as a gas by the rotational motion of an impeller or rotor or the reciprocating motion of a piston.

[0054] The storage room 270 is a storage room for storing items such as food. In this embodiment, the storage room 270 may be a freezer room, a refrigerator room, or a vegetable room. In other words, the temperature inside the room cooled by the compressor 260 may be any temperature.

[0055] The door 280 is a door for opening and closing the storage chamber 270 .

[0056] The power supply unit 290 is a power supply circuit that converts AC power from an external commercial power supply (not shown) into DC power of a predetermined level by rectifying, smoothing, stepping down, etc., and supplies the converted power to each device included in the refrigerator 200.

[0057] In addition, the log information measured or detected by each part of the measurement unit 210 and output to the detection unit 230 may be linked to date and time information indicating the date and time when the measurement or detection was performed by each part, or the detection unit 230 may link the date and time information to the log information at the time of receiving the log information.

[0058] The refrigerator 200 may also include a clock unit such as an RTC (Real Time Clock) to measure the date and time.

[0059] <Refrigerator management device> FIG. 3 is a block diagram showing a characteristic functional configuration of refrigerator management device 300 according to the embodiment.

[0060] Refrigerator management device 300 is a device that calculates a change in temperature over time inside refrigerator 200 based on log information received from refrigerator 200. Specifically, refrigerator management device 300 is a device that calculates a change in temperature over time inside refrigerator 200 when the cooling function of the refrigerator stops based on the log information, and transmits result information indicating the calculation result to terminal device 400, thereby notifying the user of the calculation result.

[0061] The refrigerator management device 300 is, for example, a personal computer. In this embodiment, the refrigerator management device 300 is a server device.

[0062] Refrigerator management device 300 includes a communication unit 310, a memory unit 320, an acquisition unit 330, a calculation unit 340, an output unit 350, and a control unit 360.

[0063] Communication unit 310 is a communication interface for communicating with refrigerator 200 and terminal device 400. Communication unit 310 is realized, for example, by a wireless communication circuit in the case of wireless communication, and by a connector connectable to a communication line in the case of wired communication. Communication unit 310 receives log information detected by refrigerator 200.

[0064] The storage unit 320 is a storage device that stores the log information received via the communication unit 310. The storage unit 320 is realized by, for example, a HDD or a flash memory.

[0065] The acquiring unit 330 is a processing unit that acquires log information including temperature information indicating the temperature inside the refrigerator 200, and opening / closing information indicating whether the door 280 of the refrigerator 200 has been opened or closed. Specifically, the acquiring unit 330 acquires log information including temperature information indicating the temperature inside the refrigerator 200 equipped with the compressor 260, compressor operation information indicating the operation state of the compressor 260, and opening / closing information indicating whether the door 280 of the refrigerator 200 has been opened or closed. The acquiring unit 330 acquires, for example, the log information stored in the storage unit 320. Alternatively, the acquiring unit 330 acquires, for example, the log information transmitted from the refrigerator 200 via the communication unit 310.

[0066] More specifically, the acquisition unit 330 acquires the log information stored in the memory unit 320, for example, when the control unit 360 receives instruction information from the terminal device 400 via the communication unit 310 indicating an instruction to calculate the change in temperature inside the storage unit over time.

[0067] Furthermore, the acquiring unit 330 acquires, for example, via the communication unit 310, malfunction information transmitted from the refrigerator 200 and indicating at least one of the fact that the detection unit 220 has detected a malfunction of the refrigerator 200 and the fact that the detection unit 220 has detected a stop of the supply of power to the refrigerator 200.

[0068] For example, acquiring unit 330 acquires malfunction result information included in the log information stored in storage unit 320. Based on the acquired malfunction result information, acquiring unit 330 determines whether detection unit 220 has detected a malfunction of refrigerator 200. For example, when acquiring unit 330 determines that detection unit 220 has detected a malfunction of refrigerator 200, acquiring unit 330 acquires the malfunction result information as malfunction information indicating that a malfunction of refrigerator 200 has been detected.

[0069] Alternatively, the acquiring unit 330 acquires, for example, power supply information included in the log information stored in the storage unit 320. The acquiring unit 330 judges whether or not the detection unit 220 has detected a stop of the power supply to the refrigerator 200 based on the acquired power supply information. For example, when the acquiring unit 330 judges that the detection unit 220 has detected a stop of the power supply to the refrigerator 200, the acquiring unit 330 acquires the power supply information as malfunction information indicating that a stop of the power supply to the refrigerator 200 has been detected.

[0070] Calculation unit 340 is a processing unit that calculates the change in temperature inside the refrigerator over time when door 280 is opened and closed within a predetermined period and when door 280 is not opened and closed within the predetermined period, based on the log information acquired by acquisition unit 330. Calculation unit 340 starts the above calculation, for example, when acquisition unit 330 acquires malfunction information. Specifically, calculation unit 340 calculates the change in temperature inside the refrigerator over time based on the change in temperature information when compressor operation information included in the log information indicates that compressor 260 is stopped.

[0071] More specifically, calculation unit 340 calculates, based on the log information, a change in temperature over time inside refrigerator 200 when compressor 260 is stopped, in a case where door 280 is opened and closed and a case where door 280 is not opened and closed. Here, compressor 260 being stopped refers to a case where compressor 260 is not operating, such as a case where the number of revolutions of compressor 260 is 0, a case where the rotation speed of compressor 260 is 0, etc.

[0072] The output unit 350 is a processing unit that outputs the calculation result calculated by the calculation unit 340 (more specifically, data (result information) indicating the calculation result). Specifically, the output unit 350 transmits the result information to the terminal device 400 via the communication unit 310. The result information may be any information that can notify the user of the calculation result of the calculation unit 340, and may be image data, audio data, or lighting information indicating the lighting state, such as the blinking cycle of the light source. In this embodiment, the result information is image data.

[0073] Output unit 350 outputs the result information, for example, after detection unit 220 detects at least one of a malfunction of refrigerator 200 and a stop in the supply of power to refrigerator 200, more specifically, after acquisition unit 330 acquires malfunction information. That is, calculation unit 340 calculates the change in temperature over time inside refrigerator 200 when door 280 of refrigerator 200 is not opened or closed and when door 280 is opened or closed, for example, after acquisition unit 330 acquires malfunction information. Output unit 350 outputs the calculation result (information indicating the calculation result) thus calculated by calculation unit 340.

[0074] Also, for example, the acquisition unit 330 acquires timing information indicating the planned timing for opening and closing the door 280. In this case, the calculation unit 340 calculates, for example, the change in temperature over time inside the refrigerator when the door 280 is opened and closed at the timing indicated by the timing information acquired by the acquisition unit 330. The acquisition unit 330 may acquire timing information stored in advance in the storage unit 320 or the like, or may acquire timing information transmitted from the terminal device 400 or the like via the communication unit 310.

[0075] Furthermore, for example, calculation unit 340 may determine whether or not the temperature inside the refrigerator exceeds a predetermined temperature at a predetermined time based on the calculated change in the temperature inside the refrigerator over time. In this case, output unit 350 may output the determination result of calculation unit 340 (more specifically, determination result information indicating the determination result) as the calculation result of calculation unit 340. Note that the information indicating the predetermined time and the predetermined temperature may each be stored in advance in storage unit 320 or the like, or may be transmitted from terminal device 400 or the like to refrigerator management device 300. For example, acquisition unit 330 acquires time information indicating the predetermined time from terminal device 400 via storage unit 320 or communication unit 310.

[0076] Furthermore, for example, calculation unit 340 calculates (estimates) from the calculated change over time of the temperature inside the refrigerator, the longest time from when detection unit 220 detects at least one of a malfunction of refrigerator 200 and a stop in the supply of power to refrigerator 200, more specifically, from when acquisition unit 330 acquires malfunction information, until the temperature inside the refrigerator exceeds a predetermined temperature. In this case, output unit 350 may output the longest time estimated by calculation unit 340 (longest time information indicating the longest time) as the calculation result (estimated result) of calculation unit 340.

[0077] The output unit 350 outputs, for example, the calculation result calculated by the calculation unit 340 as described above and fault information indicating at least one of a fact that a fault in the refrigerator 200 has been detected and a fact that power is not being supplied to the refrigerator 200 to the terminal device 400 via the communication unit 310.

[0078] Control unit 360 is a processing unit that executes various processes of refrigerator management device 300. Control unit 360 receives log information from refrigerator 200 via communication unit 310, for example, and causes storage unit 320 to store the received log information.

[0079] The acquiring unit 330, the calculating unit 340, the output unit 350, and the control unit 360 are realized, for example, by a control program stored in the storage unit 320 or the like, and a CPU that executes the control program. The acquiring unit 330, the calculating unit 340, the output unit 350, and the control unit 360 may be realized, for example, by a dedicated circuit or the like.

[0080] Note that the log information measured or detected by each part of measurement section 210 and output to detection section 230 is not linked to date and time information, and refrigerator management device 300 may link the log information indicating the date and time when each part measured or detected.

[0081] In addition, refrigerator management device 300 may include a clock unit such as an RTC (Real Time Clock) to measure the date and time.

[0082] <Terminal device> FIG. 4 is a block diagram showing a characteristic functional configuration of a terminal device 400 according to an embodiment.

[0083] Terminal device 400 is a device that notifies a user of the calculation result of calculation unit 340 based on the result information output from output unit 350 of refrigerator management device 300. Terminal device 400 is, for example, a smartphone, a tablet terminal, or a personal computer.

[0084] The terminal device 400 includes a communication unit 410, an input unit 420, a control unit 430, a notification unit 440, and a storage unit 450.

[0085] Communication unit 410 is a communication interface for communicating with refrigerator 200 and refrigerator management device 300. Communication unit 410 is realized, for example, by a wireless communication circuit in the case of wireless communication, and by a connector connectable to a communication line in the case of wired communication. Communication unit 410 receives result information transmitted from refrigerator management device 300.

[0086] The input unit 420 is a device that accepts input from a user and is realized by, for example, a button or a touch panel.

[0087] The control unit 430 is a processing unit that executes various processes executed by the terminal device 400. For example, the control unit 430 controls the notification unit 440 based on the result information received from the refrigerator management device 300 via the communication unit 410, thereby notifying the user of the calculation result.

[0088] The control unit 430 is realized, for example, by a control program stored in the storage unit 450 or the like and a CPU that executes the control program. The control unit 430 may be realized, for example, by a dedicated circuit or the like.

[0089] The notification unit 440 is a device for notifying the user of the calculation result of the calculation unit 340. When the result information is image data, the notification unit 440 is realized by a display unit such as a liquid crystal display or an organic EL (Electro Luminescence) display that displays an image based on the image data, when the result information is audio data, the notification unit 440 is realized by a sound generating unit such as an amplifier and a speaker, and when the result information is lighting information, the notification unit 440 is realized by a light source. In this embodiment, the notification unit 440 is a display that displays an image. More specifically, in this embodiment, the notification unit 440 is a touch panel display 460 (see, for example, FIG. 8) in which the input unit 420 and the notification unit 440 are integrally formed.

[0090] The storage unit 450 is a storage device that stores a control program executed by the control unit 430. The storage unit 450 is realized by, for example, a HDD or a flash memory.

[0091] [Log information and result information] Next, an example of the log information detected by the refrigerator 200 and an example of the calculation result calculated by the refrigerator management device 300 will be described with reference to Figs. 5 to 7.

[0092] FIG. 5 is a table showing an example of log information detected by the refrigerator 200 according to the embodiment.

[0093] As shown in FIG. 5, the log information includes, for example, date and time information indicating the date and time, inside information indicating the temperature inside the refrigerator, outside temperature information indicating the temperature outside the refrigerator, storage amount information indicating the storage amount inside the refrigerator, failure detection result information indicating whether compressor 260 has failed, compressor operation information indicating the rotation speed of compressor 260, opening / closing information indicating whether door 280 is open or closed, and power supply information indicating whether power is being supplied to refrigerator 200.

[0094] The inside information, the outside temperature information, the storage amount information, the compressor operation information, and the opening / closing information are examples of the measurement results by the measurement unit 210. The failure detection result information and the power supply information are examples of the detection results by the detection unit 220.

[0095] The malfunction detection result information is an example of malfunction information indicating that a malfunction of the refrigerator 200 has been detected when the malfunction detection unit 221 detects a malfunction of the refrigerator 200. The power supply information is an example of malfunction information indicating at least one of the above when the power supply detection unit 222 detects that no power is being supplied to the refrigerator 200.

[0096] The measurement unit 210 and the detection unit 220, for example, measure or detect these pieces of information at a predetermined timing and output the measurement or detection results to the detection unit 230. In this embodiment, the measurement unit 210 and the detection unit 220 measure or detect these pieces of information every 5 seconds.

[0097] Fig. 6 is a graph showing an example of log information detected by refrigerator 200 according to the embodiment. Specifically, Fig. 6 is a graph showing an example of time changes of various log information.

[0098] The horizontal axis in FIG. 6 indicates time (unit: second (sec)), and the vertical axis indicates the number of revolutions (unit: rpm (rotations per minute)) of compressor 260 in FIG. 6(a), the open / closed state (open state or closed state) of door 280 in FIG. 6(b), and the temperature inside the refrigerator (unit: °C) in FIG. 6(c). In FIG. 6(b), 1 indicates the open state, that is, the state in which door 280 is open, and 0 indicates the closed state, that is, the state in which the door is closed. In addition, in FIG. 6(a) to (c), the time is the same, and the measurement start point is set to 0, and the elapsed time from that point is shown. In addition, in the state shown in FIG. 6, it is assumed that refrigerator 200 (more specifically, compressor 260) is not broken.

[0099] 6, for example, at time t1, the rotation speed of compressor 260 is 0. Compressor 260 rotates or does not rotate in order to keep the temperature inside the refrigerator at a predetermined temperature.

[0100] Also, assume that door 280 is open between time t1 and time t2. Calculation unit 340 calculates the change in temperature inside the refrigerator over time when door 280 is open, from the change in temperature inside the refrigerator over time from time t1 to time t2.

[0101] For example, if the temperature inside the cabinet at time t1 is Temp1 and the temperature inside the cabinet at time t2 is Temp2, then the coefficient kA for calculating the change in temperature inside the cabinet over time is expressed by the following formula (1).

[0102]

number

[0103] Also, for example, at time t3, the rotation speed of the compressor 260 is 0.

[0104] Also, assume that door 280 is closed between time t3 and time t4. Calculation unit 340 calculates the change in temperature inside the refrigerator over time when door 280 is closed, from the change in temperature inside the refrigerator over time from time t3 to time t4.

[0105] For example, if the temperature inside the cabinet at time t3 is Temp3 and the temperature inside the cabinet at time t4 is Temp4, the coefficient kB for calculating the change in temperature inside the cabinet over time is expressed by the following formula (2).

[0106]

number

[0107] As described above, when it is assumed that the change over time of the temperature inside the refrigerator is constant, the calculation unit 340 can calculate the coefficients kA and kB for calculating the change over time of the temperature inside the refrigerator based on the above formulas (1) and (2). The calculation unit 340 calculates the temperature inside the refrigerator at a predetermined time based on the coefficients kA and kB calculated in this way, for example.

[0108] Fig. 7 is a diagram showing an example of a calculated value of an inside temperature change calculated by refrigerator management device 300 according to the embodiment. In Fig. 7, for example, it is assumed that compressor 260 breaks down and refrigerator 200 loses the cooling function at time t.

[0109] The calculation unit 340 calculates, for example, the time required for the temperature inside the refrigerator to rise from the temperature at time t (3.3°C in this embodiment) to a predetermined temperature Ts. Specifically, the calculation unit 340 calculates, for example, the time required for the temperature inside the refrigerator to rise from the temperature at time t to the predetermined temperature Ts when the door 280 is opened and closed (Δtopen) and the time required for the temperature inside the refrigerator to rise from the temperature at time t to the predetermined temperature Ts when the door 280 is not opened and closed (Δtclose). Note that Δtopen indicates the time required for the temperature inside the refrigerator to reach the predetermined temperature Ts when the door 280 is opened even once. In this embodiment, the door 280 is closed at Δtopen1 and Δtopen3, and the door 280 is open at Δtopen2.

[0110] For example, when the changes in temperature over time inside the container at Δtopen1, Δtopen2 and Δtopen3 are ΔTemp1, ΔTemp2 and ΔTemp3, respectively, the calculation unit 340 calculates Δtopen and Δtclose by the following equations (3) and (4).

[0111]

number

[0112] This enables calculation unit 340 to calculate the change in temperature over time inside the cabinet when door 280 is open, more specifically, when door 280 is opened and closed, and the change in temperature over time inside the cabinet when door 280 is not opened or closed, more specifically, when door 280 is kept closed.

[0113] The refrigerator management device 300 transmits result information indicating the calculation result thus calculated to the terminal device 400.

[0114] The calculation unit 340 may use the time change indicated by the log information as it is for the change in temperature inside the container when the door 280 is open and the change in temperature inside the container when the door 280 is closed, without using the above formulas (1) and (2).

[0115] [Example] Next, an example of an image displayed by the terminal device 400 will be described with reference to FIG.

[0116] FIG. 8 is a diagram showing an example of an image showing a calculation result of the temperature inside refrigerator 200 displayed on terminal device 400 according to the embodiment.

[0117] For example, when control unit 430 receives result information via communication unit 410, it causes touch panel display 460 to display image 461 indicating the calculation result of refrigerator management device 300 based on the result information.

[0118] Image 461 includes, for example, the current time, and information indicating the time from the current time until the temperature inside each of the refrigerator compartment, freezer compartment, and vegetable compartment, which are specific examples of storage compartments 270 included in refrigerator 200, reaches a predetermined temperature. More specifically, image 461 includes information indicating, for example, for each of the refrigerator compartment, freezer compartment, and vegetable compartment, the time it takes for the temperature inside each of the compartments to reach a predetermined temperature from the current time when door 280 is opened for 30 seconds, and the time it takes for the temperature inside each of the compartments to reach a predetermined temperature from the current time when door 280 is kept closed.

[0119] This allows the user to easily grasp the temperature inside the refrigerator.

[0120] Also, for example, the image 461 may include an image for receiving an input from the user. For example, the image 461 includes a receiving unit 470 which is an image showing a button such as "update". For example, when the user presses the receiving unit 470, the control unit 430 may transmit to the refrigerator management device 300 update request information requesting information indicating the time taken for the temperature inside each refrigerator to reach a predetermined temperature from the current time when the door 280 is opened for 30 seconds and the time taken for the temperature inside each refrigerator to reach a predetermined temperature from the current time when the door 280 is kept closed, which is set to the current time. When the refrigerator management device 300 receives the update request information, the refrigerator management device 300 may recalculate the time taken for the temperature inside each refrigerator to reach a predetermined temperature from the current time when the door 280 is opened for 30 seconds and the time taken for the temperature inside each refrigerator to reach a predetermined temperature from the current time when the door 280 is kept closed, and transmit result information indicating the calculation result to the terminal device 400. The terminal device 400 may update (change) the image displayed on the touch panel display 460 based on the result information.

[0121] [Processing Procedure] Next, a process procedure of the process executed by the refrigerator management system 100 will be described with reference to FIG. 9 and FIG.

[0122] FIG. 9 is a sequence diagram showing a process procedure executed by refrigerator management system 100 according to the embodiment.

[0123] First, the refrigerator 200 detects log information (step S101). The refrigerator 200 repeatedly executes step S101 at predetermined time intervals.

[0124] Next, refrigerator 200 transmits the log information detected in step S101 to refrigerator management device 300 (step S102). Note that refrigerator 200 may execute step S102 every time it executes step S101, or may store the log information detected in step S101 once in storage unit 250 and transmit the stored log information collectively.

[0125] Next, the refrigerator management device 300 receives the log information (Step S103).

[0126] Next, the refrigerator management device 300 stores the log information received in step S103 (step S104). The refrigerator 200 and the refrigerator management device 300 repeatedly execute steps S101 to S104.

[0127] Here, it is assumed that the refrigerator 200 detects an abnormality in the cooling function (step S105). Step S105 is, for example, when the failure detection unit 221 detects a failure of the compressor 260, or when the power supply detection unit 222 detects that no power is being supplied from the power supply unit 290 to each unit.

[0128] Next, refrigerator 200 transmits the malfunction information to refrigerator management device 300. In addition, refrigerator management device 300 transmits the received malfunction information to terminal device 400.

[0129] If refrigerator 200 and terminal device 400 are capable of direct communication with each other, refrigerator 200 may transmit the malfunction information directly to terminal device 400. In this case, for example, when the detection result by detection unit 220 indicates at least one of the fact that a malfunction of refrigerator 200 has been detected and the fact that power is not being supplied to refrigerator 200, detection unit 230 may transmit the malfunction information to terminal device 400 via transmission unit 240.

[0130] When the terminal device 400 receives the malfunction information, it notifies the user of, for example, information indicating that an abnormality has occurred in the cooling function of the refrigerator 200 (step S106). In step S106, for example, the terminal device 400 displays an image including information other than the time required to reach the predetermined temperature, from among the image 461 shown in FIG. 8.

[0131] Next, for example, it is assumed that terminal device 400 receives a request from the user requesting a calculation result of the change in temperature inside the refrigerator over time (step S107). In step S107, for example, it is assumed that terminal device 400 presses reception unit 470. Also, in step S107, reception unit 470 receives timing information from the user, for example, indicating the timing when door 280 is scheduled to be opened and closed.

[0132] Terminal device 400 transmits request information indicating that a request for a calculation result of a time change in temperature inside the refrigerator has been received from the user to refrigerator management device 300 (step S108). If reception unit 470 has received timing information in step S107, terminal device 400 also transmits the timing information.

[0133] The refrigerator management device 300 receives the request information (Step S109).

[0134] Next, refrigerator management device 300 executes a calculation process to calculate the change in temperature inside the refrigerator over time when door 280 is opened and closed during a predetermined period and when door 280 is not opened and closed during the predetermined period, based on the log information (step S110).

[0135] Next, refrigerator management device 300 outputs (more specifically, transmits to terminal device 400) result information indicating the calculation result calculated in step S110 (step S111).

[0136] The terminal device 400 notifies (displays, in this embodiment) the received result information to the user (step S112).

[0137] 10 is a flowchart showing the processing procedure of the calculation process executed by refrigerator management device 300 according to the embodiment. More specifically, FIG. 10 is a flowchart showing details of step S110 shown in FIG.

[0138] First, acquisition unit 330 of refrigerator management device 300 acquires log information stored in storage unit 320 (Step S201).

[0139] Next, calculation unit 340 of refrigerator management device 300 calculates, based on the log information acquired by acquisition unit 330 in step S201, the change in temperature inside the refrigerator over time when door 280 of refrigerator 200 is opened or closed, and the change in temperature inside the refrigerator over time when door 280 of refrigerator 200 is not opened or closed (step S202).

[0140] Next, refrigerator management device 300 outputs result information indicating the calculation result calculated in step S202 (step S203). More specifically, refrigerator management device 300 transmits result information indicating the calculation result calculated in step S203 to terminal device 400.

[0141] Note that the timing for executing each step shown in Fig. 10 may be arbitrary. For example, refrigerator management device 300 may repeatedly execute each step shown in Fig. 10 at a predetermined timing, or may execute each step when detection information is received.

[0142] Furthermore, in step S202, calculation unit 340 may calculate the time required for the temperature inside the refrigerator to reach a predetermined temperature. The predetermined temperature may be stored in advance in storage unit 320, or may be included in the request notification information.

[0143] Furthermore, after step S202, calculation unit 340 may further determine whether the temperature inside the refrigerator exceeds a predetermined temperature at a predetermined time based on the calculated change in the temperature inside the refrigerator over time, and include the determination result (determination result information indicating the determination result) in the calculation result (result information indicating the calculation result). When calculation unit 340 makes such a determination, terminal device 400 may, for example, accept input of time information indicating the predetermined time from the user in step S107, and transmit the accepted time information indicating the scheduled time in step S108. In this case, acquisition unit 330 acquires the time information received from terminal device 400 in, for example, step S201.

[0144] Furthermore, when acquisition unit 330 acquires malfunction information after step S202, calculation unit 340 may further estimate, from the calculated change over time in the temperature inside the refrigerator, the longest time from when detection unit 220 detects at least one of a malfunction of refrigerator 200 and a stop in the supply of power to refrigerator 200 until the temperature inside the refrigerator exceeds a predetermined temperature. In this case, output unit 350 may output information indicating the longest time estimated by calculation unit 340 (longest time information) by including it in the result information.

[0145] In step S203, the output unit 350 outputs result information indicating at least one of the calculation results obtained by the calculation unit 340 described above.

[0146] 11 is a flowchart showing the procedure of the acquisition process executed by refrigerator management device 300 according to the embodiment. More specifically, FIG. 11 is a flowchart showing details of step S201 shown in FIG.

[0147] First, acquisition unit 330 of refrigerator management device 300 extracts, from the log information stored in memory unit 320, log information in a state where compressor 260 is stopped (i.e., a state where the rotation speed is 0) and door 280 of refrigerator 200 is open, and log information in a state where compressor 260 is stopped and door 280 of refrigerator 200 is closed (step S301).

[0148] Next, acquisition unit 330 of refrigerator management device 300 selects and acquires log information in a state where compressor 260 is stopped and door 280 of refrigerator 200 is open, and log information in a state where compressor 260 is stopped and door 280 of refrigerator 200 is closed, based on the outside temperature and storage amount, from the log information extracted in step S301 (step S302). Acquisition unit 330 acquires log information indicating the outside temperature and storage amount of refrigerator 200 from the latest log information, for example, and selects and acquires log information that matches or is closest to the outside temperature and storage amount from the log information extracted in step S301.

[0149] Next, calculation unit 340 of refrigerator management device 300 executes step S202 shown in Fig. 10. Specifically, in step S202, calculation unit 340 calculates the change in temperature over time inside the refrigerator when door 280 of refrigerator 200 is opened or closed, and the change in temperature over time inside the refrigerator when door 280 of refrigerator 200 is not opened or closed, based on the log information selected and acquired by acquisition unit 330 in step S302.

[0150] Note that, when the compressor 260 has failed and the power supply unit 290 is normal, that is, when power is being normally supplied to the refrigerator 200, various sensors included in the refrigerator 200 operate normally. Therefore, for example, when the failure detection unit 221 detects a failure of the compressor 260 in step S105 shown in Fig. 9, the refrigerator 200 may repeatedly execute steps S101 and S102. Of course, when the failure detection unit 221 detects a failure of the compressor 260 in step S105 shown in Fig. 9, the refrigerator 200 does not need to repeatedly execute steps S101 and S102.

[0151] In addition, in Fig. 9, the refrigerator management device 300 executes step S109 when it receives the request information, but this is not limited to this. For example, the refrigerator management device 300 may execute the processes of step S110 and after when it receives the malfunction information after the refrigerator 200 executes step S105 shown in Fig. 9.

[0152] According to this, when refrigerator management device 300 receives malfunction information, it executes step S110, so that when the user operates terminal device 400 to send request information (i.e., when terminal device 400 executes step S108), the result information has already been generated and the result information can be sent immediately to terminal device 400. Alternatively, when refrigerator management device 300 receives malfunction information, it executes steps S110 and S111 to specifically notify the user of the impact on the interior of refrigerator 200 due to the abnormality.

[0153] 10, for example, when timing information has been acquired, calculation unit 340 of refrigerator management device 300 calculates, based on the log information and timing information acquired by acquisition unit 330 in step S201, the change in temperature over time inside the refrigerator when door 280 of refrigerator 200 is opened / closed at the timing indicated by the timing information, and the change in temperature over time inside the refrigerator when door 280 of refrigerator 200 is not opened / closed. Here, when refrigerator management device 300 executes steps S110 and S111 immediately after receiving malfunction information, it may calculate the change in temperature over time inside the refrigerator when door 280 of refrigerator 200 is opened / closed at any predetermined timing, and the change in temperature over time inside the refrigerator when door 280 of refrigerator 200 is not opened / closed.

[0154] [Variations] Next, modified examples of the image displayed by the terminal device 400 will be described with reference to FIGS.

[0155] <Variation 1> FIG. 12 is a diagram showing a first example of a modified example of image 462 showing the calculation result of the temperature inside refrigerator 200 displayed on terminal device 400 according to the embodiment.

[0156] For example, when control unit 430 receives result information via communication unit 410, it causes touch panel display 460 to display image 462 indicating the calculation result of refrigerator management device 300 based on the result information.

[0157] Image 462 includes, for example, the current time, the predicted time (elapsed time), the result of whether or not the food will be kept cold at the predicted time if door 280 is opened for 30 seconds until the predicted time, and the result of whether or not the food will be kept cold at the predicted time if door 280 is kept closed until the predicted time.

[0158] The result of whether or not cold storage is possible at the predicted time if door 280 is opened for 30 seconds until the predicted time, and the result of whether or not cold storage is possible at the predicted time if door 280 is kept closed until the predicted time include whether or not the temperature inside the cabinet will reach a specified temperature between the current time and the predicted time.

[0159] For example, image 462 includes "X" as a result of whether or not cooling is possible at the predicted time when door 280 is opened for 30 seconds when the predicted time is 6:00 the next morning. This indicates that refrigerator management device 300 has calculated that the temperature inside the refrigerator will reach a predetermined temperature if door 280 is opened for 30 seconds between the current time and 6:00 the next morning.

[0160] Furthermore, for example, image 462 includes "◯" as a result of whether or not cold storage is possible at the predicted time when door 280 is kept closed, when the predicted time is 6:00 the next morning. This indicates that refrigerator management device 300 has calculated that the temperature inside the refrigerator will not reach a predetermined temperature if door 280 is kept closed from the current time until 6:00 the next morning.

[0161] This allows the user to easily grasp the temperature inside the refrigerator.

[0162] Also, for example, image 462 may include an image for accepting input from a user. For example, image 462 includes acceptance section 471, which is an image showing a button such as "update". For example, when a user presses acceptance section 471, control section 430 may transmit to refrigerator management device 300 update request information requesting information showing a determination result, which is set to the current time, of whether or not the temperature inside the refrigerator reaches a predetermined temperature from the current time to the predicted time when door 280 is opened for 30 seconds, and a determination result of whether or not the temperature inside the refrigerator reaches a predetermined temperature from the current time to the predicted time when door 280 is kept closed. When receiving the update request information, refrigerator management device 300 may recalculate the determination result of whether or not the temperature inside the refrigerator reaches a predetermined temperature from the current time to the predicted time when door 280 is opened for 30 seconds, and the determination result of whether or not the temperature inside the refrigerator reaches a predetermined temperature from the current time to the predicted time when door 280 is kept closed, and transmit result information showing the calculation result to terminal device 400. The terminal device 400 may update (change) the image displayed on the touch panel display 460 based on the result information.

[0163] The predicted time may be arbitrarily changed. For example, the image 462 includes one or more reception units 472, which are images showing buttons such as "▽". For example, when the user presses the reception unit 472, the control unit 430 causes the touch panel display 460 to display images showing multiple times. For example, when the user presses the reception unit 472, the control unit 430 causes images such as "15:00 (4h)", "21:00 (10h)", "24:00 (13h)", and "next morning 3:00 (16h)" to be displayed. For example, when the user presses any of the displayed times, the control unit 430 switches the predicted time included in the image 462 to the time pressed by the user, and deletes the image showing the cooling possibility result shown by "◯" or "X". Furthermore, for example, when the user presses the receiving unit 471, the control unit 430 may transmit to the refrigerator management device 300 update request information requesting information indicating a determination result, which is set to the current time, of whether or not the temperature inside the refrigerator will reach a predetermined temperature from the current time to the predicted time pressed by the user when the door 280 is opened for 30 seconds, and a determination result of whether or not the temperature inside the refrigerator will reach a predetermined temperature from the current time to the predicted time pressed by the user when the door 280 is kept closed. When the refrigerator management device 300 receives the update request information, the refrigerator management device 300 may recalculate the determination result of whether or not the temperature inside the refrigerator will reach a predetermined temperature from the current time to the predicted time pressed by the user when the door 280 is opened for 30 seconds, and the determination result of whether or not the temperature inside the refrigerator will reach a predetermined temperature from the current time to the predicted time pressed by the user when the door 280 is kept closed, and transmit result information indicating the calculation result to the terminal device 400. The terminal device 400 may update (change) an image displayed on the touch panel display 460 based on the result information.

[0164] The user may operate the terminal device 400 to transmit the predicted time to the refrigerator management device 300 before the terminal device 400 receives the abnormality notification.

[0165] <Variation 2> FIG. 13 is a diagram showing a second example of a modified example of image 463 showing the calculation result of the temperature inside refrigerator 200 displayed on terminal device 400 according to the embodiment.

[0166] For example, when control unit 430 receives result information via communication unit 410, it causes touch panel display 460 to display image 463 indicating the calculation result of refrigerator management device 300 based on the result information.

[0167] The image 463 includes, for example, the current time, the predicted time (elapsed time), the schedule for opening and closing the door 280, and the result of whether or not the cooling function can be maintained at the predicted time.

[0168] The result of whether or not cooling is possible includes whether or not the temperature inside the refrigerator will reach a predetermined temperature between the current time and the predicted time.

[0169] For example, image 463 includes "X" as a result of whether or not cooling is possible at the predicted time when the predicted time is 6:00 the next morning and there is a schedule for opening and closing door 280. This indicates that refrigerator management device 300 has calculated that if door 280 is opened for a predetermined time (e.g., 30 seconds) between the current time and 6:00 the next morning, the temperature inside the refrigerator will reach a predetermined temperature.

[0170] This allows the user to easily grasp the temperature inside the refrigerator.

[0171] Also, for example, image 463 may include an image for accepting input from the user. For example, image 462 includes acceptance section 473 which is an image showing a button such as "recalculate". For example, when a user presses acceptance section 473, control section 430 may transmit to refrigerator management device 300 update request information requesting information indicating a determination result of whether or not the temperature inside the refrigerator will reach a predetermined temperature between the current time and a predicted time according to the current time and the scheduled opening and closing of door 280. When refrigerator management device 300 receives the update request information, it may recalculate a determination result of whether or not the temperature inside the refrigerator will reach a predetermined temperature between the current time and a predicted time according to the scheduled opening and closing of door 280, and transmit result information indicating the calculation result to terminal device 400. Terminal device 400 may update (change) an image displayed on touch panel display 460 based on the result information.

[0172] Also, the predicted time may be arbitrarily changeable, similarly to the first modification. For example, the image 463 includes one or more reception units 474, which are images showing buttons such as "▽". For example, when the user presses reception unit 472, the control unit 430 executes the same process as the first modification.

[0173] In addition, the door opening / closing schedule may be arbitrarily changed. For example, image 463 includes one or more reception units 475, which are images showing buttons such as "▽". For example, when the user presses reception unit 475, control unit 430 causes touch panel display 460 to display images showing opening / closing schedules such as "open" and "not open". For example, when the user presses an image showing one of the displayed opening / closing schedules, control unit 430 switches the opening / closing schedule included in image 463 to the opening / closing schedule pressed by the user, and deletes the image showing the cooling availability result shown as "◯" or "×". Furthermore, when the user presses reception unit 473, for example, control unit 430 may transmit, to refrigerator management device 300, update request information requesting information showing a determination result of whether or not the temperature inside the refrigerator according to the opening / closing schedule of door 280, which is set to the current time, will reach a predetermined temperature from the current time to the predicted time pressed by the user. When receiving the update request information, refrigerator management device 300 may again calculate a determination result of whether or not the temperature inside the refrigerator according to the schedule for opening and closing door 280 will reach a predetermined temperature between the current time and the predicted time pressed by the user, and transmit result information indicating the calculation result to terminal device 400. Terminal device 400 may update (change) the image displayed on touch panel display 460 based on the result information.

[0174] Image 463 also includes information indicating the time when the temperature inside the refrigerator will reach a predetermined temperature if door 280 remains closed, and the elapsed time from the current time until the temperature inside the refrigerator reaches the predetermined temperature. For example, image 463 indicates 9:00 the next morning as the time when the temperature inside the refrigerator will reach the predetermined temperature if door 280 remains closed, and indicates 22 hours as the elapsed time from the current time until the temperature inside the refrigerator will reach the predetermined temperature.

[0175] Image 463 also includes information indicating the time when the temperature inside the refrigerator reaches a predetermined temperature when door 280 is opened as scheduled, and the elapsed time from the current time until the temperature inside the refrigerator reaches the predetermined temperature. For example, assuming that door 280 is opened at a predicted time, refrigerator management device 300 calculates the time when the temperature inside the refrigerator reaches the predetermined temperature and the elapsed time when door 280 is opened as scheduled. Image 463 indicates, for example, 5:00 the next morning as the time when the temperature inside the refrigerator reaches the predetermined temperature when door 280 is opened as scheduled, and indicates 18 hours as the elapsed time when the temperature inside the refrigerator reaches the predetermined temperature from the current time.

[0176] This allows the user to easily grasp the temperature inside the refrigerator.

[0177] <Variation 3> FIG. 14 is a diagram showing a third example of a modified example of image 464 showing the calculation result of the temperature inside refrigerator 200 displayed on terminal device 400 according to the embodiment.

[0178] The third modification is different from the second modification in that the predicted time of opening and closing the door is set to "not open" at 6:00 p.m.

[0179] In this case, in the third modification, unlike the second modification, the possibility of keeping the food cool is set to "○" when the predicted time is 6:00 the next morning.

[0180] Furthermore, image 464 shows, for example, 7:00 the next morning as the time when the temperature inside the cabinet will reach the specified temperature if door 280 is opened as scheduled, and shows 20 hours as the elapsed time from the current time until the temperature inside the cabinet reaches the specified temperature.

[0181] In this way, the user can operate the terminal device 400 to arbitrarily change the predicted time and the schedule for opening and closing the door 280, and can easily grasp how cold the temperature inside the refrigerator is at any time.

[0182] [Effects, etc.] As described above, the refrigerator management method according to the present embodiment includes a first acquisition step (step S201) of acquiring log information including temperature information indicating the temperature inside refrigerator 200 and opening / closing information indicating whether door 280 of refrigerator 200 has been opened or closed, a calculation step (step S202) of calculating, based on the log information, a change in temperature inside the refrigerator over time when door 280 is opened and closed within a predetermined period and when door 280 is not opened or closed within the predetermined period, and an output step (step S203) of outputting result information indicating the calculation result calculated in the calculation step (step S202).

[0183] This makes it possible to calculate the change in temperature inside the refrigerator over time by taking into account the effect of opening and closing the door 280, which is likely to affect the temperature inside the refrigerator. Therefore, the change in temperature inside the refrigerator over time can be calculated with high accuracy.

[0184] Also, for example, refrigerator 200 includes compressor 260. In this case, the log information further includes compressor operation information indicating the operation state of compressor 260. In this case, in the calculation step (step S201), a change in temperature over time inside refrigerator 200 is calculated based on the log information when compressor 260 is stopped and when door 280 is opened and closed and when door 280 is not opened and closed.

[0185] According to this, the change in temperature inside the refrigerator can be calculated using the state in which the compressor 260 is not cooling the inside of the refrigerator. Therefore, for example, when calculating the change in temperature inside the refrigerator when the refrigerator 200 loses its cooling function, the change in temperature inside the refrigerator can be calculated with higher accuracy.

[0186] Also, for example, the refrigerator management method according to the embodiment further includes a detection step (step S105) of detecting at least one of a malfunction of refrigerator 200 and a stop of power supply to refrigerator 200. In this case, in the output step (step S203), after at least one of a malfunction of refrigerator 200 and a stop of power supply to refrigerator 200 is detected in the detection step (step S105), result information is output.

[0187] According to this, when the refrigerator 200 loses its cooling function, that is, when the temperature inside the refrigerator starts to rise and there is a possibility that food and the like inside the refrigerator may be adversely affected, the user can be appropriately notified of the condition inside the refrigerator.

[0188] Also, for example, the refrigerator management method according to the embodiment further includes a second acquisition step (for example, step S107) of acquiring timing information indicating the planned timing of opening and closing of door 280. In this case, in the calculation step (step S202), a change in temperature over time inside the refrigerator when door 280 is opened and closed at the timing indicated by the timing information acquired in the second acquisition step is calculated.

[0189] This makes it possible to calculate the change in temperature inside the refrigerator over time when the door 280 is opened and closed at any timing. Therefore, for example, it is possible to calculate the change in temperature inside the refrigerator over time when the door 280 is opened and closed at a timing desired by the user. This improves convenience.

[0190] Also, for example, the refrigerator management method according to the embodiment further includes a determination step of determining whether or not the temperature inside the refrigerator exceeds a predetermined temperature at a predetermined time based on the change over time of the temperature inside the refrigerator calculated in the calculation step (step S202). In this case, in the output step (step S203), the determination result (determination result information) determined in the determination step is output. In this case, for example, in the output step, the determination result information is included in the result information and output. The determination step is executed, for example, between step S202 and step S203.

[0191] This allows the user to easily grasp the temperature state inside the refrigerator, thereby further improving convenience.

[0192] Also, for example, the refrigerator management method according to the embodiment further includes a third acquisition step (for example, step S107) of acquiring time information indicating a predetermined time.

[0193] This makes it possible to calculate, for example, the change in temperature inside the refrigerator over time at a time desired by the user, thereby further improving convenience.

[0194] Also, for example, the refrigerator management method according to the embodiment further includes a longest time estimation step of estimating a longest time from when at least one of a malfunction of refrigerator 200 and a stop of power supply to refrigerator 200 is detected in the detection step (step S105) until the temperature inside the refrigerator exceeds a predetermined temperature, based on the change over time of the temperature inside the refrigerator calculated in the calculation step (step S202). In this case, in the output step (step S203), the longest time (longest time information) estimated in the longest time estimation step is output. In this case, for example, in the output step, the longest time information is included in the result information and output. The longest time estimation step is executed, for example, between step S202 and step S203.

[0195] This makes it easier to know how long the quality of food and other items stored in the warehouse can be maintained, further improving convenience.

[0196] Also, for example, in the output step (step S203), the calculation result of the calculation unit 340 and fault information indicating at least one of a fact that a fault in the refrigerator 200 has been detected and a fact that no power is being supplied to the refrigerator 200 are output.

[0197] This allows the user to immediately know that the refrigerator 200 has lost its cooling function. Therefore, the user can immediately take measures such as repairing the refrigerator 200 or consuming the food in the refrigerator. This further improves convenience.

[0198] Furthermore, refrigerator management device 300 according to the embodiment includes an acquisition unit 330 that acquires log information including temperature information indicating the temperature inside refrigerator 200 and opening / closing information indicating whether door 280 of refrigerator 200 has been opened or closed, a calculation unit 340 that calculates the change over time in the temperature inside the refrigerator when door 280 is opened and closed and when it is not opened, based on the log information acquired by acquisition unit 330, and an output unit 350 that outputs result information indicating the calculation result calculated by calculation unit 340.

[0199] This makes it possible to calculate the change in temperature inside the refrigerator over time by taking into account the effect of opening and closing the door 280, which is likely to affect the temperature inside the refrigerator. Therefore, the change in temperature inside the refrigerator over time can be calculated with high accuracy.

[0200] Moreover, refrigerator management system 100 according to the embodiment includes refrigerator 200, refrigerator management device 300 capable of communicating with refrigerator 200, and terminal device 400 capable of communicating with the refrigerator management device. Refrigerator 200 includes detection unit 230 that detects log information including temperature information indicating the temperature inside refrigerator 200 and opening / closing information indicating whether door 280 of refrigerator 200 has been opened or closed, and transmission unit 240 that transmits the log information detected by detection unit 230 to refrigerator management device 300. Refrigerator management device 300 includes acquisition unit 330 that acquires the log information transmitted from transmission unit 240, calculation unit 340 that calculates a time change in the temperature inside the refrigerator when door 280 is opened and closed and when door 280 is not opened or closed based on the log information acquired by acquisition unit 330, and output unit 350 that outputs result information indicating the calculation result calculated by calculation unit 340. Terminal device 400 includes notification unit 440 that notifies the calculation result based on the result information output from output unit 350.

[0201] This makes it possible to calculate the change in temperature inside the refrigerator over time by taking into account the effect of opening and closing the door 280, which is likely to affect the temperature inside the refrigerator. Therefore, the change in temperature inside the refrigerator over time can be calculated with high accuracy.

[0202] The present invention may be realized as a temperature calculation method for calculating the temperature inside refrigerator 200 based on the operation state of compressor 260. The temperature calculation method may be executed by refrigerator management device 300, for example.

[0203] FIG. 15 is a flowchart showing a temperature calculation method according to the embodiment.

[0204] First, acquisition unit 330 of refrigerator management device 300 acquires log information including temperature information indicating the temperature inside refrigerator 200 equipped with compressor 260, compressor operation information indicating the operation state of compressor 260 (for example, whether compressor 260 is operating or stopped), and opening / closing information indicating whether door 280 of refrigerator 200 has been opened or closed (step S401).

[0205] Next, calculation unit 340 of refrigerator management device 300 calculates the time change in temperature inside the refrigerator based on the change in temperature information when compressor operation information included in the log information indicates that compressor 260 is stopped (step S402).

[0206] In this manner, the temperature calculation method according to the embodiment includes a first acquisition step (step S401) of acquiring log information including temperature information indicating the temperature inside refrigerator 200 equipped with compressor 260, compressor operation information indicating the operation state of compressor 260, and opening / closing information indicating whether door 280 of refrigerator 200 has been opened or closed, and a calculation step (step S402) of calculating a change over time in the temperature inside the refrigerator based on a change in the temperature information when the compressor operation information included in the log information indicates that compressor 260 is stopped.

[0207] According to this, it is possible to calculate the change in temperature inside the refrigerator 200 over time based on the operating state of the compressor 260 (for example, whether the compressor 260 is operating) and taking into consideration the influence of opening and closing of the door 280, which is likely to affect the temperature inside the refrigerator 200. Therefore, it is possible to accurately calculate the change in temperature inside the refrigerator 200 over time.

[0208] (Other embodiments) Although the refrigerator management method and the like according to the present invention have been described based on the embodiments, the present invention is not limited to the above-described embodiments.

[0209] For example, in the above embodiment, all or some of the components of the processing unit such as the failure detection unit 221 and the detection unit 230 included in the refrigerator 200 may be configured with dedicated hardware, or may be realized by executing a software program suitable for each component. Each component may be realized by a program execution unit such as a CPU or a processor reading and executing a software program recorded on a recording medium such as a hard disk drive (HDD) or a semiconductor memory.

[0210] Also, for example, the components of the processing unit may be configured with one or more electronic circuits. Each of the one or more electronic circuits may be a general-purpose circuit or a dedicated circuit.

[0211] The one or more electronic circuits may include, for example, a semiconductor device, an integrated circuit (IC), or a large scale integration (LSI). The IC or LSI may be integrated into one chip or into multiple chips. Here, the IC or LSI is referred to as an IC or LSI, but the name may vary depending on the degree of integration, and may be called a system LSI, a very large scale integration (VLSI), or an ultra large scale integration (ULSI). Also, a field programmable gate array (FPGA) that is programmed after the LSI is manufactured can be used for the same purpose.

[0212] The same applies to the refrigerator management device 300 and the terminal device 400.

[0213] In the above embodiment, refrigerator management device 300 is a server device and is communicably connected to refrigerator 200 and terminal device 400 via network 500. However, refrigerator 200, refrigerator management device 300, and terminal device 400 may be formed integrally. For example, the functional configuration of at least one of refrigerator management device 300 and terminal device 400 may be provided in refrigerator 200.

[0214] Furthermore, for example, when the functional configuration of at least one of refrigerator management device 300 and terminal device 400 is provided in refrigerator 200, all or some of the components of processing units such as detection unit 230 provided in refrigerator 200, calculation unit 340 provided in refrigerator management device 300, and control unit 430 provided in terminal device 400 may be configured with dedicated hardware, or may be realized by executing a software program suitable for each component. Each component may be realized by a program execution unit such as a CPU or processor reading and executing a software program recorded on a recording medium such as an HDD (Hard Disk Drive) or semiconductor memory.

[0215] Furthermore, the general or specific aspects of the present invention may be realized as a system, an apparatus, a method, an integrated circuit, or a computer program. Alternatively, the present invention may be realized as a computer-readable non-transitory recording medium such as an optical disk, a HDD, or a semiconductor memory in which the computer program is stored. Furthermore, the present invention may be realized as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium.

[0216] In addition, as long as the spirit of the present invention is not deviated from, various modifications that would come to mind by a person skilled in the art and forms constructed by combining components of different embodiments are also included within the scope of the present invention. [Industrial Applicability]

[0217] The present invention can be applied to a management device communicatively connected to a refrigerator, and a refrigerator management system including the refrigerator and the management device. [Explanation of symbols]

[0218] 100 Refrigerator Management System 200 Refrigerator 210 Measuring section 211 Rotational speed measurement unit 212 Storage volume measurement section 213 Door opening and closing measurement unit 214 Internal temperature measurement unit 215 Outside temperature measuring section 220 Detection unit 221 Fault detection unit 222 Power supply detection unit 230 Detection unit 240 Transmitter 250, 320, 450 storage section 260 Compressor 270 Storage Room 280 Doors 290 Power supply section 300 Refrigerator management device 310, 410 Communications Department 330 Acquisition Department 340 Calculation Department 350 Output section 360, 430 Control section 400 Terminal Equipment 420 Input section 440 Notification Department 460 Touch Panel Display 461, 462, 463, 464 Images 470, 471, 472, 473, 474, 475 Reception 500 Network 600 houses

Claims

1. A refrigerator management method, comprising: a first acquisition step of acquiring log information including temperature information indicating an internal temperature of a refrigerator and opening / closing information indicating whether a door of the refrigerator has been opened or closed; a calculation step of calculating, based on the log information, a first future time change of the temperature inside the compartment when the door is opened or closed in a predetermined future period, and a second future time change of the temperature inside the compartment when the door is not opened or closed in the predetermined future period; a detection step of detecting at least one of a malfunction of the refrigerator and a stop of power supply to the refrigerator; an output step of outputting result information indicating a calculation result calculated in the calculation step, after at least one of a malfunction of the refrigerator and a stop of power supply to the refrigerator is detected in the detection step, The refrigerator management method further includes a maximum time estimating step of estimating a longest time from when at least one of a failure of the refrigerator and a stop of power supply to the refrigerator is detected in the detection step until the temperature inside the refrigerator exceeds a predetermined temperature, based on the first future time change and the second future time change of the temperature inside the refrigerator calculated in the calculation step, In the output step, maximum time information indicating the maximum time estimated in the maximum time estimation step is output. How to manage your refrigerator.

2. The refrigerator includes a compressor, The log information further includes compressor operation information indicating an operation state of the compressor, In the calculation step, the first future time change of the temperature inside the compartment when the door is opened and closed and the second future time change of the temperature inside the compartment when the door is not opened and closed are calculated based on the log information in a case where the compressor is stopped. The refrigerator management method according to claim 1.

3. a second acquisition step of acquiring timing information indicating a future timing when the door is scheduled to be opened or closed; In the calculation step, the first future time change of the temperature inside the storage compartment when the door is opened or closed at the future timing indicated by the timing information acquired in the second acquisition step is calculated. The refrigerator management method according to claim 1.

4. Further, the method includes a determination step of determining whether or not the temperature inside the storage compartment will exceed a predetermined temperature at a predetermined time based on the first future time change and the second future time change of the temperature inside the storage compartment calculated in the calculation step, In the output step, the determination result determined in the determination step is output. The refrigerator management method according to any one of claims 1 to 3.

5. Further, a third acquisition step of acquiring time information indicating the predetermined time is included. The refrigerator management method according to claim 4.

6. In the output step, fault information indicating at least one of a fact that a fault in the refrigerator has been detected and a fact that power is not being supplied to the refrigerator is output. The refrigerator management method according to any one of claims 1 to 5.

7. an acquisition unit that acquires log information including temperature information indicating an internal temperature of a refrigerator and opening / closing information indicating whether a door of the refrigerator has been opened or closed; a calculation unit that calculates a first future time change of the temperature inside the compartment when the door is opened or closed in a predetermined future period and a second future time change of the temperature inside the compartment when the door is not opened or closed in the predetermined future period based on the log information acquired by the acquisition unit; A detection unit that detects at least one of a malfunction of the refrigerator and a stop of power supply to the refrigerator; an output unit that outputs result information indicating a calculation result calculated by the calculation unit after the detection unit detects at least one of a malfunction of the refrigerator and a stop of power supply to the refrigerator, The calculation unit further estimates a longest time from when the detection unit detects at least one of a malfunction of the refrigerator and a stop of power supply to the refrigerator to when the temperature inside the refrigerator exceeds a predetermined temperature, based on the first future time change and the second future time change of the calculated temperature inside the refrigerator; The output unit outputs longest time information indicating the longest time estimated by the calculation unit. Refrigerator management device.

8. A refrigerator and A refrigerator management device capable of communicating with the refrigerator; A terminal device capable of communicating with the refrigerator management device, The refrigerator includes: a detection unit that detects log information including temperature information indicating an internal temperature of the refrigerator and opening / closing information indicating whether a door of the refrigerator has been opened or closed; A transmission unit that transmits the log information detected by the detection unit to the refrigerator management device, The refrigerator management device includes: an acquisition unit that acquires the log information transmitted from the transmission unit; a calculation unit that calculates a first future time change of the temperature inside the compartment when the door is opened or closed in a predetermined future period and a second future time change of the temperature inside the compartment when the door is not opened or closed in the predetermined future period based on the log information acquired by the acquisition unit; A detection unit that detects at least one of a malfunction of the refrigerator and a stop of power supply to the refrigerator; an output unit that outputs result information indicating a calculation result calculated by the calculation unit after the detection unit detects at least one of a malfunction of the refrigerator and a stop of power supply to the refrigerator, the terminal device has a notification unit that notifies the calculation result based on the result information output from the output unit, The calculation unit further estimates a longest time from when the detection unit detects at least one of a malfunction of the refrigerator and a stop of power supply to the refrigerator to when the temperature inside the refrigerator exceeds a predetermined temperature, based on the first future time change and the second future time change of the calculated temperature inside the refrigerator; The output unit outputs longest time information indicating the longest time estimated by the calculation unit. Refrigerator management system.

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