Management device, management system, management method, and management program

Abstract

The present invention makes it possible to improve the accuracy of predicting failure in a tire. A management device 1 includes an acquisition unit that acquires the internal pressure and the temperature of a tire of a vehicle 50, and an output unit that outputs information pertaining to the tire or information related to use of the tire when a period in which condition 3 is satisfied and at least one of condition 1 and condition 2 is satisfied is equal to or longer than a prescribed period.　Condition 1: The median value of the internal pressure of the tire is equal to or less than a first reference value or equal to or greater than a second reference value.　Condition 2: The fluctuation range of the internal pressure of the tire is equal to or greater than a third reference value.　Condition 3: The maximum value of the temperature of the tire is equal to or greater than a fourth reference value.

Description

Management device, management system, management method, and management program

[0001] The disclosed technology relates to a management device, a management system, a management method, and a management program.

[0002] Conventionally, sudden failure of vehicle tires during use is an issue that should be avoided because it not only poses a safety issue but also disrupts the operation plan of a mine mining site, leading to losses for the vehicle user.

[0003] Known techniques for predicting tire failure include approaches based on external damage and fatigue accumulated inside the tire. Failures caused by internal fatigue are particularly difficult to detect compared to external damage, which can be detected and addressed by visual inspections and other means.

[0004] One technique for preventing internal damage is to provide a sensor module in the tire to measure the internal pressure and temperature of the tire (see, for example, Patent Document 1).

[0005] The technology described in Patent Document 1 proposes a technology for managing vehicle operation based on measured values ​​of internal pressure and temperature.

[0006] Japanese Patent Application Laid-Open No. 2007-91202

[0007] However, the technology described in Patent Document 1 leaves room for improvement in terms of the accuracy of tire failure prediction.

[0008] The present disclosure has been made in consideration of the above points, and aims to provide a management device, a management system, a management method, and a management program that can improve the accuracy of tire failure prediction.

[0009] A first aspect of the present disclosure is a management device including an acquisition unit that acquires the internal pressure and temperature of a tire of a vehicle, and an output unit that outputs information about the tire or information related to the use of the tire when the following condition 3 is met and the period during which at least one of condition 1 and condition 2 is met is equal to or longer than a predetermined period. Condition 1: The median internal pressure of the tire is equal to or smaller than a first reference value or equal to or larger than a second reference value. Condition 2: The fluctuation range of the internal pressure of the tire is equal to or larger than a third reference value. Condition 3: The maximum temperature of the tire is equal to or larger than a fourth reference value.

[0010] A second aspect of the present disclosure is the management device of the first aspect, wherein the output unit outputs an alert related to the condition of the tire as information about the tire or information related to the use of the tire.

[0011] A third aspect of the present disclosure is a management device of the first or second aspect, wherein condition 3 is that the maximum value obtained by adding the maximum value of the temperature of the tire to a value obtained by multiplying the outside air temperature of the vehicle by a predetermined intake ratio is equal to or greater than the fourth reference value.

[0012] A fourth aspect of the present disclosure is the management device of the second or third aspect, wherein the output unit outputs, in addition to the alert, a method of operating the vehicle that can prevent tire failure.

[0013] A fifth aspect of the present disclosure is a management system including the management device described in any one of the second to fourth aspects, the vehicle equipped with a sensor that measures the internal pressure and temperature of the tire, and a control unit that controls the driving of the vehicle when the output unit outputs an alert.

[0014] A sixth aspect of the present disclosure is a management method in which a computer executes a process of acquiring the internal pressure and temperature of a tire of a vehicle, and outputting information about the tire or information related to the use of the tire if the following condition 3 is satisfied and the period during which at least one of condition 1 and condition 2 is satisfied is equal to or longer than a predetermined period. Condition 1: The median internal pressure of the tire is equal to or smaller than a first reference value or equal to or larger than a second reference value. Condition 2: The range of fluctuation of the internal pressure of the tire is equal to or larger than a third reference value. Condition 3: The maximum temperature of the tire is equal to or larger than a fourth reference value.

[0015] A seventh aspect of the present disclosure is a management program that causes a computer to execute a process of acquiring the internal pressure and temperature of a tire of a vehicle, and outputting information about the tire or information related to the use of the tire if the following condition 3 is satisfied and the period during which at least one of condition 1 and condition 2 is satisfied is equal to or longer than a predetermined period. Condition 1: The median internal pressure of the tire is equal to or less than a first reference value or equal to or greater than a second reference value. Condition 2: The fluctuation range of the internal pressure of the tire is equal to or greater than a third reference value. Condition 3: The maximum temperature of the tire is equal to or greater than a fourth reference value.

[0016] The disclosed technology can improve the accuracy of tire failure prediction.

[0017] 1 is a diagram showing the overall configuration of a management device 1 and peripheral devices according to this embodiment; FIG. 2 is a block diagram showing the hardware configuration of the management device 1 according to this embodiment; FIG. 3 is a block diagram showing the functional configuration of the management device 1 according to this embodiment; FIG. 4 is a graph showing the distribution of median tire internal pressures when a first reference value is set according to this embodiment; FIG. 5 is a graph showing a plot of the tire internal pressure fluctuation range when a third reference value is set according to this embodiment; FIG. 6 is a graph showing a plot of tire temperature when a fourth reference value is set according to this embodiment; and FIG. 7 is a flowchart showing a failure prediction notification process according to this embodiment.

[0018] An example of an embodiment of the disclosed technology will be described below with reference to the drawings. Note that the same or equivalent components and parts in each drawing are given the same reference numerals. Also, the dimensional proportions in the drawings are exaggerated for the convenience of explanation and may differ from the actual proportions.

[0019] The management device 1 according to this embodiment predicts tire failures on a vehicle and outputs an alert if the tire is at a high risk of failure. First, the overall configuration of the management device 1 and peripheral devices will be described.

[0020] FIG. 1 is a diagram showing the overall configuration of a management device 1 including a vehicle 50 according to this embodiment. As shown in FIG. 1, the system according to this embodiment is configured to include the management device 1 and a plurality of vehicles 50. Each vehicle 50 is equipped with a communication device 25 and a plurality of TPMS (Tire Pressure Monitoring Systems) 20 (details of which will be described later). The management device 1 according to this embodiment is connected to the communication device 25 of each vehicle 50 so as to be able to communicate wirelessly. Furthermore, the communication device 25 of the vehicle 50 is connected to the TPMS 20 provided in each tire of the vehicle 50 so as to be able to communicate. As a result, the management device 1 receives tire information.

[0021] 2 is a block diagram showing the hardware configuration of the management device 1 according to this embodiment. As shown in FIG. 2, the management device 1 is configured using, for example, a computer 10. The computer 10 includes a CPU (Central Processing Unit) 10A, a RAM (Random Access Memory) 10B, a non-volatile memory 10C, and an input / output interface (I / O) 10D. Each component is connected to each other via a bus 10E so as to be able to communicate with each other.

[0022] The CPU 10A is a central processing unit that executes various programs and controls each component. That is, the CPU 10A reads programs from the nonvolatile memory 10C and executes the programs using the RAM 10B as a work area. The CPU 10A controls each component and performs various arithmetic processing in accordance with the programs stored in the nonvolatile memory 10C. The CPU 10A also handles the processing of each functional unit shown in FIG. 3.

[0023] The nonvolatile memory 10C is an example of a storage device that maintains stored information even when power to the nonvolatile memory 10C is cut off. For example, a semiconductor memory is used, but a hard disk may also be used. Information that needs to be retained even when power to the management device 1 is cut off, such as tire pressure and temperature, is stored in the nonvolatile memory 10C. The nonvolatile memory 10C also functions as the data storage unit 1M in FIG. 3 and stores various types of information. The nonvolatile memory 10C does not necessarily need to be built into the computer 10; it may be, for example, a portable storage device that is detachable from the computer 10.

[0024] The I / O 10D is connected to, for example, a communication unit 11, an input unit 12, and a display unit 13. The management device 1 is configured to include the communication unit 11, the input unit 12, and the display unit 13.

[0025] The communication unit 11 is connected to a communication line and has a communication protocol for transmitting and receiving data to and from external devices connected to the communication line. For example, when the management device 1 is installed in a fleet control room, the management device 1 communicates data with each vehicle 50 via a wireless line, which is an example of a communication line connected to the communication unit 11. Also, when the management device 1 is installed in a vehicle 50, the management device 1 may communicate data with a server (not shown) installed in the fleet control room via the wireless line connected to the communication unit 11, and display the internal pressure and temperature of each tire on a monitor installed in the fleet control room.

[0026] The communication unit 11 also wirelessly communicates with a communication device 25 of the vehicle 50. The communication device 25 is provided on the vehicle 50 and communicates with the TPMS 20 of each tire of the vehicle 50. The TPMS 20 includes at least a transmitter 23, a temperature sensor 21, and a pressure sensor 22. The transmitter 23 communicates with the communication device 25 of the vehicle 50. Specifically, the transmitter 23 transmits at least information on the temperature and pressure of the tires of the vehicle 50. The temperature and pressure measurements by the temperature sensor 21 and the pressure sensor 22 are performed at a predetermined sampling interval. Note that because tires generate heat while traveling, the measured pressure values ​​may differ from those when the tires return to room temperature. Therefore, it is preferable to convert the measured pressure to the pressure at room temperature as necessary. In other words, because the measured tire internal pressure is affected by temperature, a value converted (corrected) to the pressure at a constant temperature may be used as the tire internal pressure described below. In addition, although measurements are performed at a predetermined sampling interval in this embodiment, this is not a limitation, and measurements may also be performed when the tires are cold, i.e., when cold. If the tire pressure is measured when the tire is cold, changes in pressure due to temperature changes are excluded, improving the accuracy of tire failure prediction. Note that an outside temperature gauge (not shown) for measuring the outside temperature around the vehicle 50, which will be described later, may be provided on the vehicle 50.

[0027] The input unit 12 is a device that receives user instructions and notifies the CPU 10A of the instructions, and includes, for example, a button, a touch panel, a mouse, a keyboard, and a pointing device.

[0028] The display unit 13 is an example of a display device that displays information processed by the CPU 10A as an image, and includes, for example, a liquid crystal display or an organic EL (Electro Luminescence) display. For example, if the management device 1 is installed in a vehicle 50, the display unit 13 is used as a monitor inside the vehicle. Also, if the management device 1 is installed in a traffic control room, the display unit 13 is used as a monitor inside the traffic control room.

[0029] Referring to FIG. 3, the functional configuration of the computer 10 constituting the management device 1 according to this embodiment will be described. As shown in FIG. 3, the computer 10 of this embodiment includes an acquisition unit 1A, a determination unit 1B, an output unit 1C, and a control unit 1D. A data storage unit 1M is also provided in a predetermined storage area of ​​the nonvolatile memory 10C. The CPU 10A executes processing programs stored in the nonvolatile memory 10C, thereby functioning as the acquisition unit 1A, the determination unit 1B, the output unit 1C, and the control unit 1D. The data storage unit 1M stores settings for the first to fourth reference values, which will be described later. The data storage unit 1M also stores various information acquired by the acquisition unit 1A.

[0030] The acquisition unit 1A acquires the internal pressure and temperature of each tire of a plurality of vehicles 50. Note that the determination by the determination unit 1B, which will be described later, is performed for each tire of the vehicle 50. The internal tire pressure is measured by a pressure sensor 22 of the TPMS 20 attached to the tire of the vehicle 50. The acquisition unit 1A acquires the tire internal pressure measurement results via the communication unit 11 and the I / O 10D. The tire temperature is measured by a temperature sensor 21 of the TPMS 20 attached to the vehicle 50. The acquisition unit 1A acquires the tire temperature measurement results via the communication unit 11 and the I / O 10D.

[0031] The determination unit 1B determines whether each of the following conditions, Condition 1 to Condition 3, is satisfied. The conditions are as follows: Condition 1: The median tire internal pressure is equal to or less than a first reference value or equal to or greater than a second reference value. Condition 2: The tire internal pressure fluctuation range is equal to or greater than a third reference value. Condition 3: The maximum tire temperature is equal to or greater than a fourth reference value.

[0032] First, the determination unit 1B determines whether or not Condition 1 is satisfied, i.e., whether or not the median tire pressure of the vehicle 50 is equal to or less than a first reference value or equal to or greater than a second reference value. Specifically, the determination unit 1B first sets a first reference value and a second reference value in advance. Each reference value is set based on an actual measurement value, which is the median tire pressure measured in the past, and the fact that the vehicle has been able to operate stably within the range of the actual measurement value (details will be described later). When the first reference value is set and the determination unit 1B determines whether the median tire pressure is equal to or less than the first reference value, this indicates that the determination unit 1B determines whether the tire pressure is lower than the reference value. When the second reference value is set and the determination unit 1B determines whether the median tire pressure is equal to or greater than the second reference value, this indicates that the determination unit 1B determines whether the tire pressure is higher than the reference value. Here, the median tire internal pressure is, for example, obtained by obtaining tire internal pressure measurements of the vehicle 50 at preset sampling intervals (e.g., every few seconds) from the start of operation of the vehicle 50 to the end of operation of the vehicle 50 in one day, and calculating the median value of all the measurements. The determination unit 1B calculates the median tire internal pressure for each day. In this way, the determination unit 1B makes a determination by comparing each set reference value with the calculated median tire internal pressure.

[0033] Furthermore, the determination unit 1B determines whether or not Condition 2 is satisfied, i.e., whether or not the fluctuation range of the tire internal pressure of the vehicle 50 is equal to or greater than a third reference value. Specifically, the determination unit 1B first presets a third reference value. The third reference value is set based on actual tire internal pressure fluctuation values ​​measured in the past, which are the fluctuation range of the tire internal pressure, and the fact that the vehicle 50 was able to operate stably within the range of the actual measurement values ​​(details will be described later). Here, the fluctuation range of the tire internal pressure is, for example, the maximum value minus the median value of all tire internal pressure measurements obtained at predetermined sampling intervals from the start to end of operation of the vehicle 50 in one day. Note that the fluctuation range of the tire internal pressure may be the maximum value minus the minimum value of all tire internal pressure measurements, or the absolute value of the minimum value minus the median value. The determination unit 1B calculates the fluctuation range of the tire internal pressure for each day. In this way, the determination unit 1B makes a determination by comparing the set reference value with the calculated fluctuation range of the tire internal pressure.

[0034] Furthermore, the determination unit 1B determines whether or not Condition 3 is satisfied, i.e., whether or not the maximum tire temperature of the vehicle 50 is equal to or greater than a fourth reference value. Specifically, the determination unit 1B first sets a fourth reference value in advance. The fourth reference value is set based on the actual measurement value, which is the maximum tire temperature measured in the past, and the fact that the vehicle 50 has been able to operate stably within the range of the actual measurement value (details will be described later). The determination unit 1B calculates the maximum tire temperature for each day. In this way, the determination unit 1B makes a determination by comparing the set reference value with the calculated maximum tire temperature.

[0035] Condition 3 may be, instead of "the maximum tire temperature is equal to or greater than the fourth reference value," that "the maximum tire temperature is equal to or greater than the fourth reference value, and the maximum tire temperature is equal to or greater than the fourth reference value, when the maximum tire temperature is calculated by multiplying the outside air temperature measured by the outside air temperature gauge of vehicle 50 by a predetermined intake ratio."

[0036] The setting of the first to fourth reference values ​​will be further explained using FIGS. 4 to 6. FIG. 4 is a graph showing the distribution of the median internal pressures of multiple tires, for normal tires and faulty tires, when the first reference value was set. The horizontal axis of FIG. 4 represents tire pressure, and the vertical axis represents the number of tires. The distribution of normal tires is line 103, and the distribution of faulty tires is line 105. As can be seen from the distribution in FIG. 4, faulty tires tend to be located on the low pressure side. Therefore, the first reference value (dotted line 100 in FIG. 4) is set using the lower limit pressure of normal tires as a threshold. Similarly, the second reference value is set using the upper limit pressure of normal tires as a threshold (not shown).

[0037] FIG. 5 is a graph plotting the daily values ​​of the internal pressure fluctuation range for normal tires and defective tires when the third reference value is set. The horizontal axis of FIG. 5 represents the number of days, with the day the tire was removed being set as day 0, and values ​​from that day up to 30 days prior are plotted. The vertical axis represents pressure, and the fluctuation range, as described above, is, for example, the maximum tire internal pressure minus the median tire internal pressure. The normal tire is plotted as line 303, and the defective tire is plotted as line 305. As can be seen from FIG. 5, line 303 for the normal tire tends to be flat, while line 305 for the defective tire frequently exhibits large values. Furthermore, when the load on the tire is heavy, the fluctuation range on the vertical axis becomes large. Line 305 for the defective tire shows a tendency to exhibit large values ​​frequently. As shown in FIG. 5, the third reference value is set as a threshold value at a position indicated by dotted line 300 between line 303 for the normal tire and line 305 for the defective tire.

[0038] Fig. 6 is a graph plotting the temperatures of normal tires and defective tires by day when the fourth reference value is set. The horizontal axis of Fig. 6 represents the number of days, with the day the tire was removed being set as day 0, and values ​​from that day up to 30 days prior are plotted. The vertical axis represents the tire temperature. The plot for normal tires is line 403, and the plot for defective tires is line 405. As shown in Fig. 6, the fourth reference value is set as a threshold value at a position indicated by dotted line 400 between line 403 for normal tires and line 405 for defective tires.

[0039] In setting the first to fourth reference values, the graphs of Figures 4 to 6 are not only used in the internal processing of the management device 1, but may also be displayed on the display unit 13 so that the user of the management device 1 can see them.

[0040] In the graphs of Figures 4 to 6, values ​​are calculated for each day over a 30-day period, but this is not limited to this, and monitoring may be performed over a one-week period or every hour depending on the purpose of failure prediction.

[0041] The output unit 1C outputs information about the tires of the vehicle 50 or information about tire use when Condition 3 is satisfied and at least one of Conditions 1 and 2 is satisfied for a period of, for example, three days or more. Specifically, the determination unit 1B determines whether each condition is satisfied for each day, and based on the result, the output unit 1C outputs information about the tires or information about tire use when the condition is satisfied for a period of, for example, three days or more. In this embodiment, as an example, tire information or information about tire use is output when the above conditions are satisfied for three days or more in the past 30 days. Note that these numerical values ​​are merely examples and are not limiting. Furthermore, tire information includes, for example, information identifying individual tires, information about the type of tire, etc. Information about tire use includes information about the tire usage period, information about the frequency of tire use, tire temperature, tire internal pressure, etc.

[0042] The output unit 1C outputs an alert related to the tire condition as information about the tire or information related to the use of the tire. Specifically, the output unit 1C outputs an alert related to the tire condition to the management device 1. The content of the alert may be, for example, a notification that the tire condition indicates a high risk of failure. The notification method is not limited to a displayed message, but may also be a voice notification.

[0043] In addition to the alert, the output unit 1C outputs a driving method that can prevent tire failure for the vehicle 50. Specifically, the output unit 1C outputs, for example, an instruction to reduce the driving speed of the vehicle 50, an instruction to guide the vehicle 50 to a route with a gentler road surface, an instruction to reduce the amount of cargo carried on the vehicle 50, and the like.

[0044] When the output unit 1C outputs an alert, the control unit 1D controls the traveling of the vehicle 50 equipped with the tire that is the target of the alert. Specifically, the control unit 1D controls the traveling speed and direction of the vehicle 50. The control unit 1D is part of a management system that includes the management device 1, the vehicle 50 equipped with the TPMS 20 that includes sensors that measure the internal pressure and temperature of the tire, and the control unit 1D that controls the traveling of the vehicle 50 when the output unit 1C outputs an alert.

[0045] Next, the operation of the management device 1 according to this embodiment will be described. Fig. 7 is a flowchart showing the flow of the tire failure prediction notification process. The failure prediction notification process shown in Fig. 7 is executed in the computer 10 of the management device 1. Each process in the management device 1 is executed by the CPU 10A of the computer 10 functioning as an acquisition unit 1A, a determination unit 1B, and an output unit 1C.

[0046] 7, CPU 10A executes an initialization process for counting the number of days. As an example, CPU 10A assigns the value 1 to the variable "day" and the value 0 to the variable "count." The variable "day" is a variable for counting the number of days that have passed. The variable "count" is a variable for counting the number of days that satisfy condition 4 and also satisfy condition 1 or condition 2, or the number of days that satisfy condition 4 and also satisfy condition 3.

[0047] In step S102, CPU 10A executes initialization processing of a flag indicating that any of the conditions has been satisfied. As an example, CPU 10A assigns the value false to a variable flag, which is a flag.

[0048] In step S104, the CPU 10A acquires the tire internal pressure and temperature.

[0049] In step S106, CPU 10A determines whether the tire temperature is equal to or greater than a fourth reference value. If CPU 10A determines that the acquired tire temperature is equal to or greater than the fourth reference value (step S106: YES), the process proceeds to step S108 or step S110. Note that steps S108 and S110 are performed in parallel. On the other hand, if CPU 10A determines that the acquired tire temperature is not equal to or greater than the fourth reference value, that is, is less than the fourth reference value (step S106: NO), the process proceeds to step S120.

[0050] In step S108, CPU 10A determines whether the median tire internal pressure is equal to or less than a first reference value or equal to or greater than a second reference value. If CPU 10A determines that the acquired median tire internal pressure is equal to or less than the first reference value or equal to or greater than the second reference value (step S108: YES), the process proceeds to step S112. On the other hand, if CPU 10A determines that the acquired median tire internal pressure is greater than the first reference value or less than the second reference value (step S108: NO), the process proceeds to step S116.

[0051] In step S110, CPU 10A determines whether the fluctuation range of the tire internal pressure is equal to or greater than a third reference value. If CPU 10A determines that the acquired fluctuation range of the tire internal pressure is equal to or greater than the third reference value (step S110: YES), the process proceeds to step S114. On the other hand, if CPU 10A determines that the acquired fluctuation range of the tire internal pressure is not equal to or greater than the third reference value, that is, is less than the third reference value (step S110: NO), the process proceeds to step S116.

[0052] In step S112, CPU 10A assigns the value true to variable flag.

[0053] In step S114, CPU 10A assigns the value true to variable flag.

[0054] In step S116, CPU 10A determines whether the value of variable flag is true. If CPU 10A determines that the value of variable flag is true (step S116: YES), the process proceeds to step S118. On the other hand, if CPU 10A determines that the value of variable flag is not true (i.e., the value of variable flag is the initial value, false) (step S116: NO), the process proceeds to step S120.

[0055] In step S118, CPU 10A adds (increments) the value 1 to variable count.

[0056] In step S120, CPU 10A determines whether the value of variable day is 30. If CPU 10A determines that the value of variable day is 30 (step S120: YES), the process proceeds to step S124. On the other hand, if CPU 10A determines that the value of variable day is not 30 (step S120: NO), the process proceeds to step S122. Note that in this embodiment, failure prediction is made based on measurement results over a 30-day period, but this is not limiting, and the value of 30 used in the determination in step S120 may be changed as appropriate to suit the period to be referenced.

[0057] In step S122, CPU 10A adds (increments) the value 1 to variable day.

[0058] In step S124, CPU 10A determines whether the value of variable count is equal to or greater than a threshold value. The threshold value is, for example, 3. If CPU 10A determines that the value of variable count is equal to or greater than the threshold value (step S124: YES), the process proceeds to step S126. On the other hand, if CPU 10A determines that the value of variable count is less than the threshold value (step S124: NO), the process proceeds to step S128.

[0059] In step S126, CPU 10A determines that the tire has a risk of failure.

[0060] In step S128, CPU 10A determines that the tire has no risk of failure, and then ends the process.

[0061] In step S130, CPU 10A outputs an alert. The alert may not only notify that the risk of failure is high, but may also output a driving method for vehicle 50 that can prevent tire failure, as described above, or may control the driving of vehicle 50. Then, the process ends.

[0062] As described above, the management device 1 according to this embodiment includes an acquisition unit 1A that acquires the tire pressure and temperature of the vehicle 50, and an output unit 1C that outputs tire information or information related to tire use when Condition 3 is satisfied and at least one of Conditions 1 and 2 is satisfied for a predetermined period of time or longer. Therefore, the management device 1 according to this embodiment can improve the accuracy of tire failure prediction. Furthermore, because the failure determination checks not only the tire temperature but also the tire median pressure or the tire pressure fluctuation range, the accuracy of failure prediction is improved. Furthermore, because the reference values ​​used in failure determination are calculated from actual measurements, failure prediction can be performed that is more in line with the actual situation. Furthermore, because the reference values ​​can be flexibly set, for example, by setting the reference values ​​according to the characteristics and actual conditions of each mine and using the management device 1, tire failure prediction can be performed with high accuracy for each location where the vehicle 50 travels.

[0063] The combination of conditions 1 to 3 may be changed as appropriate. For example, as described above, an alert is output when condition 3 is met and at least one of conditions 1 and 2 is met for a period of, for example, three days or more. Also, an alert is output when all of conditions 1 to 3 are met for a period of, for example, three days or more. In this way, the combination of conditions can be changed, so that it can be adapted to the characteristics and actual conditions of each mine, for example.

[0064] In this embodiment, an example is described in which an alert is output when a condition is met for a predetermined number of days or more within a predetermined period, but this is not limited to this. For example, it is also possible to output an alert when a condition is met for a predetermined percentage or more within a predetermined period. In addition, for example, an alert may be output when a condition is met by 30% or more within one hour.

[0065] Furthermore, the management device 1 of this embodiment can predict failures of tires equipped on multiple vehicles 50. Therefore, for example, in a mine where multiple vehicles 50 are lined up in sequence to transport goods at a mining site, tire failures can be predicted in advance, making it possible to reduce waiting times for tire replacement due to tire failures.

[0066] This application claims priority based on Japanese Patent Application No. 2024-117150, filed on July 22, 2024, the entire contents of which are incorporated herein by reference.

[0067] REFERENCE SIGNS LIST 1 Management device 1A Acquisition unit 1B Determination unit 1C Output unit 1D Control unit 1M Data storage unit 10 Computer 10A CPU 10B RAM 10C Non-volatile memory 10D I / O 10E Bus 11 Communication unit 12 Input unit 13 Display unit 14 Temperature sensor 15 Pressure sensor 20 TPMS 21 Temperature sensor 22 Pressure sensor 23 Transmitter 25 Communication device 50 Vehicle 100 First reference value 300 Third reference value 400 Fourth reference value

Claims

1. A management device including: an acquisition unit that acquires the internal pressure and temperature of a vehicle tire; and an output unit that outputs information about the tire or information related to the use of the tire when the following condition 3 is met and the period during which at least one of condition 1 and condition 2 is met is equal to or longer than a predetermined period. Condition 1: The median internal pressure of the tire is equal to or less than a first reference value or equal to or greater than a second reference value. Condition 2: The fluctuation range of the internal pressure of the tire is equal to or greater than a third reference value. Condition 3: The maximum temperature of the tire is equal to or greater than a fourth reference value.

2. The management device according to claim 1, wherein the output unit outputs an alert relating to the condition of the tire as information about the tire or information relating to the use of the tire.

3. The management device according to claim 1, wherein condition 3 is that the maximum value obtained by adding the maximum value of the temperature of the tire to a value obtained by multiplying the outside air temperature of the vehicle by a predetermined intake ratio is equal to or greater than the fourth reference value.

4. The management device according to claim 2, wherein the output unit outputs, in addition to the alert, a method of operating the vehicle that can prevent tire failure.

5. A management system comprising: the management device according to claim 2; the vehicle equipped with a sensor for measuring the internal pressure and temperature of the tire; and a control unit that controls the driving of the vehicle when the output unit outputs an alert.

6. A management method in which a computer executes a process to acquire the internal pressure and temperature of a vehicle tire, and output information about the tire or information related to the use of the tire if the following condition 3 is met and the period during which at least one of condition 1 and condition 2 is met is longer than a predetermined period. Condition 1: The median internal pressure of the tire is less than a first reference value or greater than a second reference value. Condition 2: The fluctuation range of the internal pressure of the tire is greater than a third reference value. Condition 3: The maximum temperature of the tire is greater than a fourth reference value.

7. A management program that causes a computer to execute a process of acquiring the internal pressure and temperature of a vehicle tire, and outputting information about the tire or information related to the use of the tire when the following condition 3 is met and the period during which at least one of condition 1 and condition 2 is met is longer than a predetermined period. Condition 1: The median internal pressure of the tire is equal to or less than a first reference value or equal to or greater than a second reference value. Condition 2: The fluctuation range of the internal pressure of the tire is equal to or greater than a third reference value. Condition 3: The maximum temperature of the tire is equal to or greater than a fourth reference value.

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