Depressurized state detection system, determination method, and program

Abstract

To provide a depressurized state detection system, a determination method, and a program that can prevent the possibility that although being a correct operation, update operation is determined as an incorrect operation.SOLUTION: A vehicle 1 includes: a first acquisition processing unit 71 that acquires a related value related to air pressure of a tire; a detection processing unit 72 that detects a depressurized state of the tire based on the related value and a predetermined reference value; an update processing unit 73 that updates the reference value when an operation on an initialization button 31 is accepted; and a first determination processing unit 74 that determines whether the operation on the initialization button 31 is an incorrect operation based on a parking status of the vehicle 1 during the period from the detection of the depressurized state to the acceptance of the operation on the initialization button 31.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a decompression state detection system, a determination method, and a program. [Background technology]

[0002] A decompression state detection device is known that can detect a decompressed state of a pneumatic tire mounted on a vehicle based on the rotational speed of the pneumatic tire. Specifically, the decompression state detection device acquires a related value related to the air pressure of the pneumatic tire, such as the resonant frequency of the pneumatic tire, based on the rotational speed at each predetermined acquisition timing. The decompression state is detected based on the acquired related value and a predetermined reference value.

[0003] In the decompression state detection device, the reference value is updated after the decompression state is resolved. Specifically, in the decompression state detection device, when a predetermined update operation such as operating an initialization button is accepted, the reference value is updated based on the related value obtained after the acceptance of the update operation.

[0004] In this case, the user of the vehicle may perform the update operation after the decompression state is detected and before the decompression state is resolved. In response to this, a decompression state detection device is known as a related art that determines that the update operation is an erroneous operation when the difference between the two related values ​​acquired before and after the update operation is received is within a predetermined range (see Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-249024 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the decompression state is resolved by replacing the pneumatic tires, the difference between the two related values ​​acquired before and after receiving the update operation may fall within a predetermined range even if the update operation is performed after the decompression state is resolved. Therefore, in the decompression state detection device according to the above-described related art, when the decompression state is resolved by replacing the pneumatic tires, the update operation may be determined to be an incorrect operation even though it is a correct operation.

[0007] An object of the present disclosure is to provide a decompression state detection system, a determination method, and a program that can prevent an update operation from being determined to be an incorrect operation even though it is a correct operation. [Means for solving the problem]

[0008] A decompression state detection system according to one aspect of the present disclosure includes a first acquisition processor, a detection processor, an update processor, and a first determination processor. The first acquisition processor acquires a related value related to the air pressure of a pneumatic tire mounted on a vehicle based on the rotational speed of the pneumatic tire each time a predetermined acquisition timing arrives. The detection processor detects a decompression state of the pneumatic tire based on the related value acquired by the first acquisition processor and a predetermined reference value. When a predetermined update operation is received, the update processor updates the reference value based on the related value acquired during a first period that includes the time when the update operation is received. The first determination processor determines whether the update operation is an erroneous operation based on a stopping state of the vehicle during a second period from the time when the decompression state is detected to the time when the update operation is received.

[0009] According to this decompression state detection system, whether the update operation is an erroneous operation is determined based on the vehicle's stopped state during the second period from when the decompression state is detected to when the update operation is accepted. This makes it possible to determine that the update operation is an erroneous operation only when it can be determined that the vehicle user is unable to adjust the air pressure of the pneumatic tires or replace the pneumatic tires during the second period, such as when the vehicle is not stopped during the second period. Therefore, compared to a configuration in which the update operation is determined to be an erroneous operation when the difference between the two related values ​​obtained before and after accepting the update operation falls within a predetermined range, it is possible to prevent the update operation from being determined to be an erroneous operation when replacing the pneumatic tires resolves the decompression state. [Effects of the Invention]

[0010] According to the present disclosure, it is possible to prevent an update operation from being determined to be an incorrect operation even though it is actually a correct operation. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating a configuration of a decompression state detection system according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a diagram showing the configuration of a vehicle of the decompression state detection system according to the embodiment of the present disclosure. [Figure 3] FIG. 3 is a diagram illustrating a configuration of a server of a reduced pressure state detection system according to an embodiment of the present disclosure. [Figure 4] FIG. 4 is a flowchart illustrating an example of a related value acquisition process executed in the decompression state detection system according to the embodiment of the present disclosure. [Figure 5] FIG. 5 is a flowchart illustrating an example of a decompression state detection process executed in the decompression state detection system according to the embodiment of the present disclosure. [Figure 6] FIG. 6 is a flowchart illustrating an example of an update process executed in the decompression state detection system according to an embodiment of the present disclosure. [Figure 7] FIG. 7 is a flowchart illustrating an example of an operation determination process executed in the decompression state detection system according to the embodiment of the present disclosure. [Figure 8] FIG. 8 is a flowchart illustrating an example of a vehicle guidance process executed in the decompression state detection system according to the embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that the following embodiments are examples that embody the present disclosure and do not limit the technical scope of the present disclosure.

[0013] [Configuration of reduced pressure state detection system 100] First, with reference to FIG. 1, the configuration of a reduced pressure state detection system 100 according to an embodiment of the present disclosure will be described.

[0014] The deflation state detection system 100 can determine whether or not a pneumatic tire 2 (see FIG. 1) (hereinafter referred to as "tire 2") mounted on a vehicle 1 (see FIG. 1) has a deflated state. When the deflation state detection system 100 determines that the tire 2 has a deflated state, the deflation state detection system 100 detects the deflated state of the tire 2.

[0015] For example, in the deflation state detection system 100, if the air pressure of any tire 2 drops by a predetermined reference amount of deflation from a predetermined optimum value, it is determined that the tire 2 mounted on the vehicle 1 is depressurized. For example, the reference amount of deflation is 20 percent of the optimum value.

[0016] 1, the decompression state detection system 100 includes a vehicle 1 and a server 3. In the decompression state detection system 100, the vehicle 1 and the server 3 are connected to each other so as to be able to communicate with each other via a communication network 4. For example, the communication network 4 is the Internet.

[0017] [Vehicle 1 Configuration] Next, the configuration of the vehicle 1 will be described with reference to FIG.

[0018] The vehicle 1 is an automobile such as a passenger car, a bus, a truck, etc. Note that the vehicle 1 is not limited to an automobile, and may be a motorcycle, a three-wheeled vehicle, or the like.

[0019] As shown in FIG. 1, the vehicle 1 has four tires 2. Specifically, the vehicle 1 has four wheels (the left front wheel, the right front wheel, the left rear wheel, and the right rear wheel), and a tire 2 is mounted on each of the wheels. Hereinafter, the tire 2 mounted on the left front wheel will be referred to as "tire 2A" (see FIG. 1). The tire 2 mounted on the right front wheel will be referred to as "tire 2B" (see FIG. 1). The tire 2 mounted on the left rear wheel will be referred to as "tire 2C" (see FIG. 1). The tire 2 mounted on the right rear wheel will be referred to as "tire 2D" (see FIG. 1).

[0020] In addition to the components necessary for driving, such as an engine, the four wheels, tires 2 mounted on each of the wheels (see FIG. 1), brakes, and a steering mechanism, the vehicle 1 is equipped with a control unit 11, an operation display unit 12, a wheel speed sensor 13, a communication unit 14, a GPS receiver 15, and a memory unit 16 shown in FIG. 2.

[0021] The control unit 11 realizes various functions for detecting the decompression state of the tire 2. As shown in FIG. 2, the control unit 11 includes a CPU 21, a ROM 22, and a RAM 23. The CPU 21 is a processor that executes various arithmetic operations. The ROM 22 is a non-volatile storage device that stores in advance information such as control programs for causing the CPU 21 to execute various processes. The RAM 23 is a volatile or non-volatile storage device that is used as a temporary storage memory (work area) for the various processes executed by the CPU 21. Note that the control unit 11 does not have to be specialized for the function of detecting the decompression state of the tire 2.

[0022] The operation display unit 12 includes a first display unit and a first operation unit. The first display unit is provided in a position visible to the driver sitting in the driver's seat of the vehicle 1. For example, the first display unit is a flat panel display such as a liquid crystal display provided in a center cluster of the vehicle 1. The first display unit displays various information in response to control instructions from the control unit 11. The first operation unit is provided in a position operable by the driver sitting in the driver's seat. For example, the first operation unit is an operation button provided in the center cluster or center console of the vehicle 1, or a touch panel provided in the display unit. The first display unit may include notification lamps provided in an instrument panel of the vehicle 1 that correspond to each piece of notification information for the user of the vehicle 1.

[0023] The operation display unit 12 includes an initialization button 31 shown in Fig. 2. For example, the initialization button 31 is a physical switch provided on the center cluster or center console of the vehicle 1. The initialization button 31 is used to update a reference value used to determine deflation of the tire 2. As will be described later, the reference value is updated by operating the initialization button 31.

[0024] The wheel speed sensors 13 are sensors capable of detecting the rotational speed of the wheels (the rotational speed of the tires 2). A wheel speed sensor 13 is provided for each wheel. For example, the wheel speed sensors 13 output electrical signals corresponding to changes in a magnetic field caused by the rotation of a sensor rotor having multiple teeth provided on the inside of the wheel. The electrical signals output from each wheel speed sensor 13 are input to the control unit 11. The control unit 11 obtains the rotational speed of each tire 2 based on the electrical signals output from each wheel speed sensor 13.

[0025] The communication unit 14 is a communication interface capable of executing data communication with an external device. Specifically, the communication unit 14 executes data communication with the server 3 via the communication network 4.

[0026] The GPS receiver 15 is capable of receiving radio waves transmitted from GPS satellites. The control unit 11 is capable of acquiring vehicle position information indicating the current position of the vehicle 1 based on information contained in the radio waves received by the GPS receiver 15.

[0027] The storage unit 16 is a non-volatile storage device, such as a flash memory.

[0028] Map data of a predetermined specific region is stored in the memory unit 16. The map data is used in a process executed by a control unit different from the control unit 11 to search for a driving route from the current position of the vehicle 1 to a destination set by the driver of the vehicle 1 or the like. The specific region may be a region including multiple countries, may be any one of the countries, or may be a region included in any one of the countries.

[0029] As shown in FIG. 2, the storage unit 16 includes a specific storage area 41.

[0030] The specific storage area 41 is used to store the vehicle position information. Specifically, the control unit 11 acquires the vehicle position information at a predetermined acquisition interval using the GPS receiver 15. The control unit 11 also adds date and time information indicating the current date and time to the acquired vehicle position information. The control unit 11 then stores the vehicle position information with the date and time information added in the specific storage area 41. The multiple pieces of vehicle position information stored in succession in acquisition order in the specific storage area 41 constitute driving situation information indicating the driving situation of the vehicle 1. In other words, the driving situation information is stored in the specific storage area 41.

[0031] [Server 3 Configuration] Next, the configuration of the server 3 will be described with reference to FIG.

[0032] As shown in FIG. 3, the server 3 includes a control unit 51, an operation display unit 52, a communication unit 53, and a storage unit .

[0033] The control unit 51 comprehensively controls the server 3. As shown in Fig. 3, the control unit 51 includes a CPU 61, a ROM 62, and a RAM 63. The CPU 61, the ROM 62, and the RAM 63 are similar to the CPU 21, the ROM 22, and the RAM 23 of the vehicle 1.

[0034] The operation display unit 52 is a user interface of the server 3. The operation display unit 52 includes a second display unit and a second operation unit. The second display unit displays various information in response to control instructions from the control unit 51. For example, the second display unit is a flat panel display such as a liquid crystal display. The second operation unit inputs various information to the control unit 51 in response to user operations. For example, the second operation unit includes a keyboard, a mouse, and a touch panel.

[0035] The communication unit 53 is a communication interface that can perform data communication with an external device. Specifically, the communication unit 53 performs data communication with the vehicle 1 via the communication network 4.

[0036] The storage unit 54 is a nonvolatile storage device, such as a nonvolatile memory such as a flash memory, a solid state drive (SSD), or a hard disk drive (HDD).

[0037] The storage unit 54 stores the map data similar to that stored in the storage unit 16 of the vehicle 1.

[0038] [Functional configuration of control unit 11] Next, with reference to FIG. 2, a functional configuration for detecting the decompression state of the tire 2, which is included in the control unit 11, will be described.

[0039] 2, the control unit 11 includes a first acquisition processing unit 71, a detection processing unit 72, an update processing unit 73, and a first determination processing unit 74. Note that the reduced pressure state detection system of the present disclosure may be configured with only the control unit 11.

[0040] Specifically, the CPU 21 of the control unit 11 executes the control program stored in advance in the ROM 22 to function as each of the above-mentioned processing units.

[0041] The control program may be recorded on a computer-readable recording medium such as a CD, a DVD, or a flash memory, and may be read from the recording medium and stored in the storage unit 16. The control program may also be a program for causing a plurality of processors to function as the processing units shown in Fig. 2. Some or all of the processing units included in the control unit 11 may be configured with electronic circuits.

[0042] The first acquisition processing unit 71 acquires a related value related to the air pressure of the tire 2 based on the rotation speed of the tire 2 mounted on the vehicle 1 every time a predetermined acquisition timing arrives.

[0043] For example, the first acquisition processing unit 71 acquires the four related values ​​DEL1, DEL3, the resonance frequency of the tire 2A, and the resonance frequency of the tire 2B.

[0044] DEL1 is a value that increases as the rotational speed of tires 2A and 2D increases and decreases as the rotational speed of tires 2B and 2C increases, or a value that decreases as the rotational speed of tires 2A and 2D increases and increases as the rotational speed of tires 2B and 2C increases.

[0045] For example, DEL1 is calculated according to the following formula (1). Note that "V1" included in formula (1) is the rotational speed of tire 2A. Furthermore, "V2" included in formula (1) is the rotational speed of tire 2B. Furthermore, "V3" included in formula (1) is the rotational speed of tire 2C. Furthermore, "V4" included in formula (1) is the rotational speed of tire 2D. The rotational speeds of the four tires 2 are acquired based on the electrical signals output from the four wheel speed sensors 13 corresponding to the four tires 2.

[0046] DEL1=[(V1+V4) / (V2+V3)-1]×100(%) ··· (1)

[0047] DEL3 is a value that increases as the rotational speed of tires 2A and 2C increases and decreases as the rotational speed of tires 2B and 2D increases, or a value that decreases as the rotational speed of tires 2A and 2C increases and increases as the rotational speed of tires 2B and 2D increases.

[0048] For example, DEL3 is calculated according to the following formula (2).

[0049] DEL3=[(V1+V3) / (V2+V4)-1]×100(%) ··· (2)

[0050] The resonance frequency of the tire 2A is calculated based on the rotational speed of the tire 2A.

[0051] The resonance frequency of the tire 2B is calculated based on the rotational speed of the tire 2B.

[0052] A known method may be used to acquire the resonance frequency of the tire 2. For example, the resonance frequency of the tire 2 is acquired by performing time series analysis on rotational acceleration information calculated from the rotational speed of the tire 2 acquired by the wheel speed sensor 13, based on a second-order autoregression (AR) model.

[0053] For example, the acquisition timing is a timing that occurs at a predetermined cycle from the start of traveling of the vehicle 1. For example, the cycle is 10 minutes. Note that the acquisition timing may be a timing when the vehicle 1 is traveling at a speed equal to or higher than a predetermined speed, is not accelerating or decelerating, and is not turning.

[0054] The related values ​​acquired by the first acquisition processing unit 71 do not have to be limited to the four mentioned above. For example, the related values ​​acquired by the first acquisition processing unit 71 may include the resonance frequency of tire 2C and the resonance frequency of tire 2D. The related values ​​acquired by the first acquisition processing unit 71 may also include DEL2. DEL2 is a value that increases as the rotational speeds of tires 2A and 2B increase and decreases as the rotational speeds of tires 2C and 2D increase, or a value that decreases as the rotational speeds of tires 2A and 2B increase and increases as the rotational speeds of tires 2C and 2D increase.

[0055] The detection processing unit 72 detects the decompressed state of the tire 2 based on the related value acquired by the first acquisition processing unit 71 and a predetermined reference value.

[0056] For example, the detection processing unit 72 detects the decompressed state of the tire 2 when the difference between the related value acquired by the first acquisition processing unit 71 and the reference value exceeds a predetermined threshold value.

[0057] Here, in the vehicle 1, the reference values ​​and the threshold values ​​corresponding to the respective associated values ​​acquired by the first acquisition processing unit 71 are determined in advance.

[0058] For example, the reference value corresponding to DEL1 is a value that is set based on DEL1 acquired by the first acquisition processing unit 71 when the air pressures of the four tires 2 are at the optimum values. For example, the reference value corresponding to DEL1 is the same as the DEL1 acquired by the first acquisition processing unit 71 when the air pressures of the four tires 2 are at the optimum values. Alternatively, the reference value corresponding to DEL1 may be an average value of multiple DEL1 values ​​acquired by the first acquisition processing unit 71 when the air pressures of the four tires 2 are at the optimum values.

[0059] Furthermore, the reference value corresponding to DEL3, like the reference value corresponding to DEL1, is a value set based on DEL3 acquired by the first acquisition processing unit 71 when the air pressure of each of the four tires 2 is at the optimal value.

[0060] Furthermore, the reference value corresponding to the resonance frequency of the tire 2A is a value that is set based on the resonance frequency of the tire 2A acquired by the first acquisition processing unit 71 when the air pressure of the tire 2A is at the optimal value. For example, the reference value corresponding to the resonance frequency of the tire 2A is the same value as the resonance frequency of the tire 2A acquired by the first acquisition processing unit 71 when the air pressure of the tire 2A is at the optimal value. Furthermore, the reference value corresponding to the resonance frequency of the tire 2A may be an average value of the resonance frequencies of a plurality of tires 2A acquired by the first acquisition processing unit 71 when the air pressure of the tires 2A is at the optimal value.

[0061] Furthermore, the reference value corresponding to the resonance frequency of tire 2B is a value that is set based on the resonance frequency of tire 2B acquired by the first acquisition processing unit 71 when the air pressure of tire 2B is at the optimal value, similar to the reference value corresponding to the resonance frequency of tire 2A.

[0062] In addition, the threshold value corresponding to DEL1 is a value indicating the difference between DEL1 acquired by the first acquisition processing unit 71 when the air pressure of each of three tires 2 out of four tires 2 is at the optimal value and the air pressure of the remaining tire 2 has decreased from the optimal value by the reference pressure reduction amount, and the reference value corresponding to DEL1.

[0063] In addition, the threshold value corresponding to DEL3 is a value indicating the difference between DEL3 acquired by the first acquisition processing unit 71 when the air pressure of each of three tires 2 out of four tires 2 is at the optimal value and the air pressure of the remaining tire 2 has decreased from the optimal value by the reference pressure reduction amount, and the reference value corresponding to DEL3.

[0064] In addition, the threshold value corresponding to the resonant frequency of tire 2A is a value indicating the difference between the resonant frequency of tire 2A acquired by the first acquisition processing unit 71 when the air pressure of tire 2A has decreased by the reference pressure reduction amount from the optimal value, and the reference value corresponding to the resonant frequency of tire 2A.

[0065] In addition, the threshold value corresponding to the resonant frequency of tire 2B is a value indicating the difference between the resonant frequency of tire 2B acquired by the first acquisition processing unit 71 when the air pressure of tire 2B has decreased by the reference pressure reduction amount from the optimal value, and the reference value corresponding to the resonant frequency of tire 2B.

[0066] For example, the detection processing unit 72 determines whether or not the difference between the associated value and the reference value exceeds the threshold value for each of the associated values ​​acquired by the first acquisition processing unit 71. Then, when it is determined that the difference between the associated value and the reference value for any of the associated values ​​exceeds the threshold value, the detection processing unit 72 detects a decompressed state of the tire 2. Note that the detection processing unit 72 may also detect a decompressed state of the tire 2 when the number of times it is determined that the difference between the associated value and the reference value for any of the associated values ​​exceeds the threshold value exceeds a predetermined value.

[0067] Furthermore, when a depressurized state of the tire 2 is detected, the detection processing unit 72 identifies the tire 2 in which the pressure is depressurized.

[0068] For example, the detection processing unit 72 determines that the tire 2A has a reduced pressure when the difference between the resonance frequency of the tire 2A and the reference value corresponding to that resonance frequency exceeds the threshold value.

[0069] Furthermore, the detection processing unit 72 determines that the tire 2B has a reduced pressure when the difference between the resonance frequency of the tire 2B and the reference value corresponding to the resonance frequency exceeds the threshold value.

[0070] Furthermore, when the difference between either the associated value DEL1 or DEL3 and the reference value corresponding to that associated value exceeds the threshold, the detection processing unit 72 identifies the tire 2 that has a reduced pressure based on the combination of the signs of DEL1 and DEL3. Specifically, the detection processing unit 72 determines that tire 2A has a reduced pressure when the signs of DEL1 and DEL3 are positive. Furthermore, the detection processing unit 72 determines that tire 2B has a reduced pressure when the signs of DEL1 and DEL3 are negative. Furthermore, the detection processing unit 72 determines that tire 2C has a reduced pressure when the signs of DEL1 and DEL3 are negative. Furthermore, the detection processing unit 72 determines that tire 2D has a reduced pressure when the signs of DEL1 and DEL3 are positive.

[0071] When a deflated state of a tire 2 is detected, the control unit 11 notifies the user of the vehicle 1 of that fact. For example, the control unit 11 causes the operation display unit 12 to display a message indicating that a deflated state of a tire 2 has been detected and indicating which tire 2 is in a deflated state. The control unit 11 may also turn on a notification lamp to notify the user that a deflated state of a tire 2 has been detected. The control unit 11 also periodically emits a predetermined warning sound. This allows the user of the vehicle 1 to recognize the deflated state of the tire 2 and take action to resolve the deflated state of the tire 2 (adjust the air pressure of the tire 2 or replace the tire 2).

[0072] The notification that a decompressed state of the tire 2 has been detected continues until an update operation, which will be described later, is accepted. For example, the control unit 11 generates the warning sound until an update operation, which will be described later, is accepted.

[0073] In the vehicle 1, after the air pressure of the tires 2 is adjusted or after the tires 2 are replaced, each of the reference values ​​is updated.

[0074] When a predetermined update operation is received, the update processing unit 73 updates the reference value based on the related value acquired during a first period that includes the time when the update operation is received.

[0075] For example, the update operation is a pressing operation on the initialization button 31 (see FIG. 2).

[0076] For example, the first period is a period that starts from the time when the update operation is accepted, and ends after the number of occurrences of the acquisition timing from the time when the update operation is accepted reaches a predetermined number.

[0077] When the update operation is accepted, the update processing unit 73 updates the reference values ​​corresponding to the respective associated values.

[0078] For example, the update processing unit 73 sets any one of the DEL1 values ​​acquired during the first period as the new reference value corresponding to DEL1. Alternatively, the update processing unit 73 may set the average value of multiple DEL1 values ​​acquired during the first period as the new reference value corresponding to DEL1.

[0079] Furthermore, the update processing unit 73 sets any one of DEL3 acquired during the first period as the new reference value corresponding to DEL3. Furthermore, the update processing unit 73 may set the average value of multiple DEL3 acquired during the first period as the new reference value corresponding to DEL3.

[0080] Furthermore, the update processing unit 73 sets the resonance frequency of any one of the tires 2A acquired during the first period as the new reference value corresponding to the resonance frequency of the tire 2A. Furthermore, the update processing unit 73 may set the average value of the resonance frequencies of the plurality of tires 2A acquired during the first period as the new reference value corresponding to the resonance frequency of the tire 2A.

[0081] Furthermore, the update processing unit 73 sets any one of the resonance frequencies of the tire 2B acquired during the first period as the new reference value corresponding to the resonance frequency of the tire 2B. Furthermore, the update processing unit 73 may set an average value of the resonance frequencies of the plurality of tires 2B acquired during the first period as the new reference value corresponding to the resonance frequency of the tire 2B.

[0082] The update operation does not have to be limited to an operation on the initialization button 31 (see FIG. 2). For example, the update operation may be an operation on an operation key (soft key) displayed on the first display unit in response to a predetermined operation on the operation display unit 12. Furthermore, in a case where the control unit 11 is previously connected to a mobile terminal such as a smartphone carried by the user of the vehicle 1 so as to be able to communicate with the mobile terminal, the update operation may be an operation performed on the mobile terminal. Furthermore, the first period may be a period that starts before the update operation is accepted.

[0083] Incidentally, the user of the vehicle 1 may perform the update operation after the decompression state of the tire 2 has been detected but before the decompression state of the tire 2 has been resolved. For example, the user of the vehicle 1 may perform the update operation before the decompression state of the tire 2 has been resolved in order to stop the warning sound. In response to this, a decompression state detection device is known as related art that determines that the update operation is an erroneous operation when the difference between the two related values ​​acquired before and after receiving the update operation is within a predetermined range.

[0084] Here, when the decompressed state of tire 2 is resolved by replacing tire 2, the difference between the two related values ​​acquired before and after receiving the update operation may fall within a predetermined range even if the update operation is performed after the decompressed state of tire 2 is resolved. Therefore, in the decompressed state detection device according to the above-described related art, when the decompressed state of tire 2 is resolved by replacing tire 2, the update operation may be determined to be an incorrect operation even though it is a correct operation.

[0085] In contrast to this, in the decompression state detection system 100 according to the embodiment of the present disclosure, as will be described below, it is possible to prevent the update operation from being determined to be an incorrect operation even though it is actually a correct operation.

[0086] The first determination processing unit 74 determines whether the update operation is an erroneous operation based on the stopping state of the vehicle 1 during a second period from when the decompressed state of the tire 2 is detected to when the update operation is accepted.

[0087] For example, the first determination processing unit 74 determines whether or not the update operation is an erroneous operation based on the stopping status and stopping location of the vehicle 1 during the second period.

[0088] The stopping status of the vehicle 1 during the second period can be acquired based on the driving status information stored in the specific storage area 41 of the storage unit 16. Furthermore, the stopping location of the vehicle 1 during the second period can be identified based on the driving status information and the map data stored in the storage unit 16. Note that the first determination processing unit 74 may acquire the stopping status of the vehicle 1 during the second period based on the driving status of the engine of the vehicle 1 during the second period.

[0089] Specifically, the first determination processing unit 74 determines that the update operation is an erroneous operation when the vehicle 1 is not stopped during the second period.

[0090] Furthermore, if the vehicle 1 is stopped during the second period and the duration of the stopped state of the vehicle 1 does not exceed a predetermined specific time, the first determination processing unit 74 determines that the update operation is an erroneous operation. The specific time is set based on the shorter of the time required to adjust the air pressure of the tire 2 and the time required to replace the tire 2.

[0091] Furthermore, the first determination processing unit 74 determines that the update operation is an incorrect operation if the vehicle 1 is stopped during the second period, the stopped time of the vehicle 1 exceeds the specific time, and the place where the vehicle 1 is stopped is not a business establishment that can eliminate the decompression state of the tire 2. For example, the business establishment is a gas station, a service station, an automobile dealership, an automobile repair shop, etc.

[0092] In addition, if vehicle 1 is stopped during the second period, the stopping time of vehicle 1 exceeds the specific time, and the stopping location of vehicle 1 is the business premises, the first judgment processing unit 74 judges that the update operation is not an incorrect operation, i.e., a correct operation.

[0093] For example, each time the updating operation is received, the first determination processing unit 74 determines whether or not the received updating operation is an erroneous operation. Note that the first determination processing unit 74 may determine whether or not the received updating operation is an erroneous operation each time the updating operation is received from the time the decompressed state of the tire 2 is detected until a predetermined number of updating operations have been received.

[0094] If the update operation is determined to be an incorrect operation, the control unit 11 notifies the user of the vehicle 1 of that fact. For example, the control unit 11 causes the operation display unit 12 to display a message indicating that the update operation has been determined to be an incorrect operation. The control unit 11 may also turn on a notification lamp to notify the user that the update operation has been determined to be an incorrect operation. The control unit 11 also periodically generates the warning sound. This makes it possible to make the user of the vehicle 1 aware that the update operation has been determined to be an incorrect operation.

[0095] For example, the control unit 11 notifies the user that the update operation has been determined to be an erroneous operation at the timing when a notification is made by the first notification processing unit 83, which will be described later.

[0096] The notification that the update operation has been determined to be an incorrect operation ends after a predetermined time has elapsed. Note that the notification that the update operation has been determined to be an incorrect operation may be continued until the first determination processing unit 74 determines that the update operation is a correct operation.

[0097] In addition, the first judgment processing unit 74 may determine whether the update operation is an incorrect operation based on the stopping status of the vehicle 1 during the second period, the related values ​​acquired during the second period, and the related values ​​acquired after the second period has elapsed.

[0098] For example, the first determination processing unit 74 may determine that the update operation is a correct operation when a difference between the associated value acquired during the second period and the associated value acquired after the second period has elapsed is not within a predetermined range. Furthermore, the first determination processing unit 74 may determine that the update operation is an incorrect operation when a difference between the associated value acquired during the second period and the associated value acquired after the second period has elapsed is within a predetermined range and the vehicle 1 is not stopped during the second period. Furthermore, the first determination processing unit 74 may determine that the update operation is an incorrect operation when a difference between the associated value acquired during the second period and the associated value acquired after the second period has elapsed is within a predetermined range and the duration of the stopped state of the vehicle 1 during the second period does not exceed the specific time. Furthermore, the first determination processing unit 74 may determine that the update operation is correct if the difference between the associated value acquired during the second period and the associated value acquired after the second period has elapsed is within a predetermined range and the stopped time of the vehicle 1 during the second period exceeds the specific time. This makes it possible to improve the accuracy of determining whether the update operation is an incorrect operation.

[0099] In the decompression state detection system 100, when it is determined that the update operation is an erroneous operation, the vehicle 1 is guided to the business establishment.

[0100] [Functional configuration of control unit 51] Next, with reference to FIG. 3, a functional configuration for guiding the vehicle 1 to the business establishment, which is included in the control unit 51 of the server 3, will be described.

[0101] As shown in FIG. 3, the control unit 51 includes a search processing unit 81, a second acquisition processing unit 82, a first notification processing unit 83, a second determination processing unit 84, a second notification processing unit 85, and a third notification processing unit 86.

[0102] Specifically, a vehicle guidance program for causing the control unit 51 to function as each of the processing units shown in Fig. 3 is stored in advance in the storage unit 54 of the server 3. The CPU 61 of the control unit 51 executes the vehicle guidance program to function as each of the processing units described above.

[0103] Note that some or all of the processing units included in the control unit 51 may be configured with electronic circuits. Also, the vehicle guidance program may be a program for causing a plurality of processors to function as the processing units shown in FIG.

[0104] The search processing unit 81 searches for the establishment that can resolve the decompressed state of the tire 2 when the first determination processing unit 74 determines that the update operation is an incorrect operation.

[0105] For example, the search processing unit 81 searches for the establishments located within a predetermined specific range from the current position of the vehicle 1. For example, the specific range is a range with a radius of 5 kilometers from the vehicle 1.

[0106] If the business establishment cannot be found, the search processing unit 81 searches for the business establishment at each predetermined search timing until the business establishment is found. For example, the search timing may be every five minutes. The search timing may also be when the vehicle 1 stops, for example, at a traffic light.

[0107] For example, the search processing unit 81 communicates with the vehicle 1 and acquires from the vehicle 1 the vehicle position information that was last acquired by the vehicle 1. Furthermore, based on the vehicle position information acquired from the vehicle 1 and the map data stored in the memory unit 54, the search processing unit 81 searches for the business establishments that exist within the specific range from the position of the vehicle 1 based on the acquired vehicle position information.

[0108] The second acquisition processing unit 82 acquires a specific route from the current position of the vehicle 1 to the specific establishment that is closest to the establishments searched for by the search processing unit 81 .

[0109] For example, the second acquisition processing unit 82 acquires the specific route based on the map data stored in the storage unit 54.

[0110] The first notification processing unit 83 notifies people inside the vehicle 1 of the specific route acquired by the second acquisition processing unit 82.

[0111] For example, the first notification processing unit 83 causes the operation display unit 12 of the vehicle 1 to display a guidance screen including the specific route acquired by the second acquisition processing unit 82. For example, the guidance screen includes a map including the specific route and a message recommending that the user drive along the specific route to the specific business establishment and ask an employee of the specific business establishment to perform work to resolve the deflation state of the tire 2. This makes it possible to guide the user of the vehicle 1 to the specific business establishment.

[0112] The server 3 may be previously connected to the mobile device carried by the user of the vehicle 1 so as to be able to communicate with the mobile device. In this case, the first notification processing unit 83 may cause a guidance screen including the specific route acquired by the second acquisition processing unit 82 to be displayed on the display unit of the mobile device carried by the user of the vehicle 1.

[0113] The server 3 may also obtain in advance the email address of the mobile terminal owned by the user of the vehicle 1. In this case, the first notification processing unit 83 may send an email including the guidance screen to the email address of the mobile terminal owned by the user of the vehicle 1.

[0114] After the first notification processing unit 83 notifies the specific route, the second determination processing unit 84 determines whether the vehicle 1 is traveling along the specific route.

[0115] For example, the second determination processing unit 84 communicates with the vehicle 1 and acquires from the vehicle 1 the vehicle position information acquired after the specific route is notified to the vehicle 1. Then, the second determination processing unit 84 determines whether the vehicle 1 is traveling along the specific route based on the vehicle position information acquired from the vehicle 1. For example, the second determination processing unit 84 determines that the vehicle 1 is traveling along the specific route if the vehicle 1 has traveled along the specific route up to a midpoint on the specific route. Furthermore, the second determination processing unit 84 determines that the vehicle 1 is not traveling along the specific route if the vehicle 1 deviates from the specific route before reaching the midpoint on the specific route.

[0116] When the second determination processing unit 84 determines that the vehicle 1 is not traveling along the specific route, the second notification processing unit 85 notifies a predetermined first notification destination outside the vehicle 1 of this fact.

[0117] For example, the first notification destination may be an insurance company that has concluded an automobile insurance contract with the user of vehicle 1. In addition, if vehicle 1 is a rental vehicle such as a rental car, the first notification destination may be a rental business that rents out vehicle 1.

[0118] For example, the server 3 is connected in advance to an information processing device, such as a personal computer, corresponding to the first notification destination so as to be able to communicate with the device. The second notification processing unit 85 then displays a message indicating that the second determination processing unit 84 has determined that the vehicle 1 is not traveling along the specific route, as well as information about the user of the vehicle 1, on a display unit of the information processing device corresponding to the first notification destination. As a result, if the first notification destination is the insurance company, it is possible to consider increasing the insurance premium, etc. Furthermore, if the first notification destination is the rental company, it is possible to consider increasing the rental fee for the vehicle 1, etc.

[0119] The server 3 may acquire in advance the email address of the information processing device corresponding to the first notification destination. In this case, the second notification processing unit 85 may send an email including a message indicating that the second determination processing unit 84 has determined that the vehicle 1 is not traveling along the specific route, and information about the user of the vehicle 1, to the email address of the information processing device corresponding to the first notification destination.

[0120] When the second judgment processing unit 84 determines that the vehicle 1 is traveling along the specific route, the third notification processing unit 86 notifies the second notification destination corresponding to the specific business establishment that the vehicle 1, equipped with tires 2 in a deflated state, is traveling toward the specific business establishment.

[0121] For example, the second notification destination is the specific business establishment. Note that the second notification destination may also be a manager who manages a plurality of the business establishments.

[0122] For example, the server 3 is previously connected to the information processing device corresponding to the second notification destination so as to be able to communicate with the information processing device. Then, the third notification processing unit 86 displays a message indicating that the second determination processing unit 84 has determined that the vehicle 1 is traveling along the specific route, as well as information for identifying the vehicle 1 (such as the vehicle type, body color, and vehicle registration number), on the display unit of the information processing device corresponding to the second notification destination. This allows the specific business establishment to make preparations to respond to a visit by the vehicle 1. Specifically, the specific business establishment can make preparations to adjust the air pressure of the tires 2 of the vehicle 1 or to replace the tires 2.

[0123] The server 3 may acquire in advance the email address of the information processing device corresponding to the second notification destination. In this case, the third notification processing unit 86 may send an email including a message indicating that the second determination processing unit 84 has determined that the vehicle 1 is traveling along the specific route and information for identifying the vehicle 1, to the email address of the information processing device corresponding to the second notification destination.

[0124] Below, an example of the procedure of each process executed by the control unit 11 and the determination method of the present disclosure will be described.

[0125] [Related value acquisition process] First, an example of the procedure of the related value acquisition process executed by the control unit 11 will be described with reference to Fig. 4. Here, steps S11, S12, etc. represent the numbers of the processing procedures (steps) executed by the control unit 11. The related value acquisition process is executed while the vehicle 1 is traveling.

[0126] <Step S11> First, in step S11, the control unit 11 determines whether or not the acquisition timing has arrived.

[0127] Here, when the control unit 11 determines that the acquisition timing has arrived (Yes in S11), it shifts the process to step S12. On the other hand, when the acquisition timing has not arrived (No in S11), the control unit 11 waits for the arrival of the acquisition timing in step S11.

[0128] <Step S12> In step S12, the control unit 11 acquires the rotational speed of each tire 2.

[0129] Specifically, the control unit 11 acquires the rotation speed of each tire 2 using each wheel speed sensor 13.

[0130] <Step S13> In step S13, the control unit 11 acquires the four associated values. The processes of steps S11 to S13 are an example of the acquisition step of the present disclosure, and are executed by the first acquisition processing unit 71 of the control unit 11.

[0131] Specifically, the control unit 11 acquires DEL1 based on the rotational speed of each tire 2 acquired by the processing of step S12. The control unit 11 also acquires DEL3 based on the rotational speed of each tire 2 acquired by the processing of step S12. The control unit 11 also acquires the resonant frequency of tire 2A based on the rotational speed of tire 2A acquired by the processing of step S12. The control unit 11 also acquires the resonant frequency of tire 2B based on the rotational speed of tire 2B acquired by the processing of step S12.

[0132] [Decompression state detection process] Next, an example of the procedure of the process for detecting a reduced pressure state executed by the control unit 11 will be described with reference to Fig. 5. The process for detecting a reduced pressure state is executed while the vehicle 1 is traveling.

[0133] <Step S21> First, in step S21, the control unit 11 determines whether or not the four association values ​​have been acquired. That is, the control unit 11 determines whether or not the process of step S13 of the association value acquisition process has been executed.

[0134] Here, if the control unit 11 determines that the four related values ​​have been acquired (Yes in S21), it shifts the process to step S22. On the other hand, if the four related values ​​have not been acquired (No in S21), the control unit 11 waits for acquisition of the four related values ​​in step S21.

[0135] <Step S22> In step S22, the control unit 11 determines whether or not the difference between any of the four relation values ​​acquired in the process of step S21 and the reference value exceeds the threshold value. The process of step S22 is an example of a detection step of the present disclosure, and is executed by the detection processing unit 72 of the control unit 11.

[0136] If the control unit 11 determines that the difference between the associated value and the reference value for any of the four associated values ​​exceeds the threshold value (Yes in S22), the control unit 11 shifts the process to step S23. If the difference between the associated value and the reference value for any of the four associated values ​​does not exceed the threshold value (No in S22), the control unit 11 shifts the process to step S21.

[0137] <Step S23> In step S23, the control unit 11 identifies the tire 2 with the reduced pressure.

[0138] Specifically, the control unit 11 determines that the tire 2A is decompressed when the difference between the resonance frequency of the tire 2A and the reference value corresponding to the resonance frequency exceeds the threshold value.

[0139] Furthermore, the control unit 11 determines that the tire 2B has a reduced pressure when the difference between the resonance frequency of the tire 2B and the reference value corresponding to the resonance frequency exceeds the threshold value.

[0140] In addition, when the difference between either the related value DEL1 or DEL3 and the reference value corresponding to that related value exceeds the threshold value, the control unit 11 identifies the tire 2 that has a reduced pressure based on the combination of the sign of DEL1 and the sign of DEL3.

[0141] <Step S24> In step S24, the control unit 11 notifies the user of the vehicle 1 that a deflated state of the tire 2 has been detected.

[0142] For example, the control unit 11 causes the operation display unit 12 to display a message indicating that a deflated state of the tire 2 has been detected and indicating the tire 2 that has become deflated. The control unit 11 also periodically generates the warning sound.

[0143] [Update process] Next, an example of the procedure of the update process executed by the control unit 11 will be described with reference to FIG.

[0144] <Step S31> First, in step S31, the control unit 11 determines whether or not the update operation has been accepted.

[0145] Here, if the control unit 11 determines that the update operation has been accepted (Yes in S31), it shifts the process to step S32. On the other hand, if the update operation has not been accepted (No in S31), the control unit 11 waits for acceptance of the update operation in step S31.

[0146] <Step S32> First, in step S32, the control unit 11 determines whether or not the first period has ended.

[0147] Specifically, the control unit 11 determines that the first period has ended when the number of times the acquisition timing has arrived since the update operation was accepted reaches a predetermined number.

[0148] Here, when the control unit 11 determines that the first period has ended (Yes in S32), the control unit 11 shifts the process to step S33. On the other hand, when the first period has not ended (No in S32), the control unit 11 waits for the end of the first period in step S32.

[0149] <Step S33> In step S33, the control unit 11 updates the reference value based on the associated value acquired during the first period. The process of step S33 is an example of an update step in the present disclosure, and is executed by the update processing unit 73 of the control unit 11.

[0150] Specifically, the control unit 11 sets any one of the DEL1 values ​​acquired during the first period as the new reference value corresponding to DEL1.

[0151] Furthermore, the control unit 11 sets any one of the DEL3 values ​​acquired during the first period as the new reference value corresponding to DEL3.

[0152] Furthermore, the control unit 11 sets the resonance frequency of any one of the tires 2A acquired during the first period as the new reference value corresponding to the resonance frequency of the tire 2A.

[0153] Moreover, the control unit 11 sets any one of the resonant frequencies of the tire 2B acquired during the first period as the new reference value corresponding to the resonant frequency of the tire 2B.

[0154] [Operation detection process] Next, an example of the procedure of the operation determination process executed by the control unit 11 will be described with reference to FIG.

[0155] <Step S41> First, in step S41, the control unit 11 determines whether or not the update operation has been accepted.

[0156] Here, if the control unit 11 determines that the update operation has been accepted (Yes in S41), it shifts the process to step S42. On the other hand, if the update operation has not been accepted (No in S41), the control unit 11 waits for acceptance of the update operation in step S41.

[0157] <Step S42> In step S42, the control unit 11 determines whether the update operation is an erroneous operation based on the stopping status and stopping location of the vehicle 1 during the second period from when the deflated state of the tire 2 was last detected by the deflated state detection process to when the update operation was last accepted. The process of step S42 is an example of a determination step of the present disclosure, and is executed by the first determination processing unit 74 of the control unit 11.

[0158] Specifically, when the vehicle 1 is not stopped during the second period, the control unit 11 determines that the update operation is an erroneous operation.

[0159] Furthermore, if the vehicle 1 is stopped during the second period and the stopping time of the vehicle 1 does not exceed the specific time, the control unit 11 determines that the update operation is an erroneous operation.

[0160] In addition, the control unit 11 determines that the update operation is an incorrect operation if the vehicle 1 is stopped during the second period and the stopping time of the vehicle 1 exceeds the specific time, and the stopping location of the vehicle 1 is not the business premises.

[0161] Furthermore, if vehicle 1 is stopped during the second period, the stopping time of vehicle 1 exceeds the specific time, and the stopping location of vehicle 1 is the business premises, control unit 11 determines that the update operation is not an incorrect operation, i.e., a correct operation.

[0162] Here, if the control unit 11 determines that the update operation is an incorrect operation (Yes in S42), the control unit 11 shifts the process to step S43. On the other hand, if the update operation is not an incorrect operation (No in S42), the control unit 11 shifts the process to step S41.

[0163] <Step S43> In step S43, the control unit 11 instructs the server 3 to execute a vehicle guidance process, which will be described later.

[0164] <Step S44> In step S43, the control unit 11 notifies the user of the vehicle 1 that the update operation has been determined to be an erroneous operation.

[0165] For example, the control unit 11 displays a message indicating that the update operation has been determined to be an incorrect operation on the operation display unit 12. The control unit 11 also periodically generates the warning sound. The control unit 11 also notifies the user of the vehicle 1 that the update operation has been determined to be an incorrect operation at the timing when the process of step S54 of the vehicle guidance process described later is executed.

[0166] [Vehicle guidance processing] Next, an example of the procedure of the vehicle guidance process executed by the control unit 51 of the server 3 will be described with reference to Fig. 8. The vehicle guidance process is executed when an instruction to execute the vehicle guidance process is received from the control unit 11 of the vehicle 1.

[0167] <Step S51> First, in step S51, the control unit 51 searches for the establishments that exist within the specific range from the current position of the vehicle 1. The process of step S51 is executed by the search processing unit 81 of the control unit 51.

[0168] Specifically, the control unit 51 communicates with the vehicle 1 and acquires from the vehicle 1 the vehicle position information that was last acquired by the vehicle 1. Furthermore, based on the vehicle position information acquired from the vehicle 1 and the map data stored in the memory unit 54, the control unit 51 searches for the business establishments that exist within the specific range from the position of the vehicle 1 based on the acquired vehicle position information.

[0169] <Step S52> In step S52, the control unit 51 determines whether or not the establishment has been found by the processing in step S51.

[0170] Here, if the control unit 51 determines that the establishment has been found (Yes in S52), it shifts the process to step S53. On the other hand, if the establishment has not been found (No in S52), the control unit 51 waits for the next search timing to arrive and shifts the process to step S51.

[0171] <Step S53> In step S53, the control unit 51 acquires the specific route from the current location of the vehicle 1 to the specific establishment that is closest to the establishments searched for by the processing of step S51. The processing of step S53 is executed by the second acquisition processing unit 82 of the control unit 51.

[0172] Specifically, the control unit 51 acquires the specific route based on the map data stored in the storage unit 54.

[0173] <Step S54> In step S54, the control unit 51 executes a first notification process to notify people inside the vehicle 1 of the specific route acquired by the process of step S53. The process of step S54 is executed by the first notification processing unit 83 of the control unit 51.

[0174] For example, the control unit 51 causes the operation display unit 12 of the vehicle 1 to display the guidance screen including the specific route acquired by the processing of step S53.

[0175] <Step S55> In step S55, the control unit 51 determines whether the vehicle 1 is traveling along the specific route notified in the processing of step S54. The processing of step S55 is executed by the second determination processing unit 84 of the control unit 51.

[0176] Specifically, the control unit 51 communicates with the vehicle 1 and acquires from the vehicle 1 the vehicle position information acquired after the specific route is notified to the vehicle 1. Then, the control unit 51 determines whether the vehicle 1 is traveling along the specific route based on the vehicle position information acquired from the vehicle 1.

[0177] Here, if the control unit 51 determines that the vehicle 1 is traveling along the specific route (Yes in S55), it shifts the process to step S56. On the other hand, if the vehicle 1 is not traveling along the specific route (No in S55), the control unit 51 shifts the process to step S57.

[0178] <Step S56> In step S56, the control unit 51 executes a third notification process to notify the second notification destination corresponding to the specific business establishment that the vehicle 1 equipped with the tire 2 in a deflated state is traveling toward the specific business establishment. The process of step S56 is executed by the third notification processing unit 86 of the control unit 51.

[0179] Specifically, the control unit 51 displays a message indicating that the processing of step S55 has determined that the vehicle 1 is traveling along the specific route, and information for identifying the vehicle 1, on the display unit of the information processing device corresponding to the second notification destination.

[0180] <Step S57> In step S57, the control unit 51 executes a second notification process to notify the first notification destination outside the vehicle 1 that it has been determined in step S55 that the vehicle 1 is not traveling along the specific route. The process of step S57 is executed by the second notification processing unit 85 of the control unit 51.

[0181] Specifically, the control unit 51 displays a message indicating that the processing of step S55 has determined that the vehicle 1 is not traveling along the specific route, and information about the user of the vehicle 1, on the display unit of the information processing device corresponding to the first notification destination.

[0182] In this way, in the decompression state detection system 100, it is determined whether the update operation is an erroneous operation based on the stopped state of the vehicle 1 during the second period from the time when the decompression state of the tire 2 is detected to the time when the update operation is accepted. As a result, it is possible to determine that the update operation is an erroneous operation only when it can be determined that the user of the vehicle 1 is unable to adjust the air pressure of the tire 2 or replace the tire 2 during the second period, such as when the vehicle 1 is not stopped during the second period. Therefore, compared to a configuration in which the update operation is determined to be an erroneous operation when the difference between the two associated values ​​obtained before and after accepting the update operation is within a predetermined range, it is possible to prevent the update operation from being determined to be an erroneous operation when the decompression state of the tire 2 is resolved by replacing the tire 2.

[0183] In addition, the control unit 11 of the vehicle 1 may include some or all of the search processing unit 81, the second acquisition processing unit 82, the first notification processing unit 83, the second judgment processing unit 84, the second notification processing unit 85, and the third notification processing unit 86.

[0184] The above-described embodiments of the present disclosure include the following disclosure items (1) to (9).

[0185] Disclosed item (1) is a decompression state detection system including: a first acquisition processing unit that acquires a related value related to the air pressure of a pneumatic tire mounted on a vehicle based on the rotational speed of the pneumatic tire each time a predetermined acquisition timing arrives; a detection processing unit that detects a decompression state of the pneumatic tire based on the related value acquired by the first acquisition processing unit and a predetermined reference value; an update processing unit that, when a predetermined update operation is accepted, updates the reference value based on the related value acquired during a first period including the time when the update operation is accepted; and a first judgment processing unit that judges whether the update operation is an incorrect operation based on the stopping status of the vehicle during a second period from the time when the decompression state is detected to the time when the update operation is accepted.

[0186] According to this system, whether the update operation is an erroneous operation is determined based on the vehicle's stopped state during the second period from when the depressurized state is detected to when the update operation is accepted. This makes it possible to determine that the update operation is an erroneous operation only when it can be determined that the vehicle user is unable to adjust the air pressure of the pneumatic tires or replace the pneumatic tires during the second period, such as when the vehicle is not stopped during the second period. Therefore, compared to a configuration in which the update operation is determined to be an erroneous operation when the difference between the two related values ​​obtained before and after accepting the update operation falls within a predetermined range, it is possible to prevent the update operation from being determined to be an erroneous operation when replacing the pneumatic tires resolves the depressurized state.

[0187] Disclosed item (2) is the decompression state detection system described in disclosed item (1), in which the first judgment processing unit determines that the update operation is an incorrect operation if the duration of the vehicle's stopped state during the second period does not exceed a predetermined specific time.

[0188] Disclosure item (3) is a decompression state detection system described in disclosure item (1) or (2), in which the first judgment processing unit determines whether the update operation is an incorrect operation based on the vehicle's stopping status and stopping location during the second period.

[0189] According to this system, when the vehicle is stopped during the second period, it is possible to determine whether the update operation is an erroneous operation by taking into consideration the location where the vehicle is stopped, thereby improving the accuracy of determining whether the update operation is an erroneous operation.

[0190] Disclosed item (4) is a decompression state detection system described in any of disclosed items (1) to (3), in which the first judgment processing unit determines whether the update operation is an incorrect operation based on the vehicle's stopped state during the second period, the related values ​​acquired during the second period, and the related values ​​acquired after the second period has elapsed.

[0191] This system makes it possible to determine whether the update operation is an erroneous operation by taking into account the two related values ​​obtained before and after the update operation is accepted, thereby improving the accuracy of determining whether the update operation is an erroneous operation.

[0192] Disclosed item (5) is a decompression state detection system described in any of disclosed items (1) to (4), comprising a search processing unit that searches for a business that can resolve the decompression state when the first judgment processing unit determines that the update operation is an incorrect operation, a second acquisition processing unit that acquires a specific route from the current location of the vehicle to the specific business that is closest to the business found by the search processing unit, and a first notification processing unit that notifies people in the vehicle of the specific route.

[0193] According to this system, if it is determined that the update operation is an incorrect operation, it is possible to guide the vehicle to the nearest business office.

[0194] Disclosure (6) is the decompression state detection system described in disclosure (5), in which the search processing unit searches for the business establishment located within a predetermined specific range from the current location of the vehicle, and if the search processing unit cannot find the business establishment, searches for the business establishment each time a predetermined search timing occurs until the business establishment is found.

[0195] This system makes it possible to avoid the vehicle being guided to a business establishment that is far away from the planned route of the vehicle.

[0196] Disclosed item (7) is a decompression state detection system described in disclosed item (5) or (6), which includes a second determination processing unit that determines whether the vehicle is traveling along the specific route after the first notification processing unit notifies the specific route, and a second notification processing unit that, if the second determination processing unit determines that the vehicle is not traveling along the specific route, notifies a predetermined first notification destination outside the vehicle of this fact.

[0197] This system can make the first notification destination outside the vehicle aware that the vehicle is not traveling along the specific route. Therefore, by setting the first notification destination to the insurance company or the like, the first notification destination can impose a penalty, such as an increase in insurance premiums, on the vehicle for not trying to resolve the decompression state.

[0198] Disclosed item (8) is a decompression state detection system described in any of disclosed items (5) to (7), which includes a second determination processing unit that determines whether the vehicle is traveling along the specific route after the first notification processing unit notifies the specific route, and a third notification processing unit that, when the second determination processing unit determines that the vehicle is traveling along the specific route, notifies a second notification destination corresponding to the specific business establishment that the vehicle equipped with the pneumatic tire in the decompressed state is traveling toward the specific business establishment.

[0199] This system allows the second notification destination corresponding to the specific business establishment to be notified that the vehicle is traveling toward the specific business establishment. Therefore, the specific business establishment can make preparations to respond to the vehicle's visit. Specifically, the specific business establishment can make preparations to adjust the air pressure of the pneumatic tires of the vehicle or to replace the pneumatic tires.

[0200] Disclosed matter (9) is a determination method executed by one or more processors, which includes an acquisition step of acquiring a related value related to the air pressure of a pneumatic tire mounted on a vehicle based on the rotational speed of the pneumatic tire each time a predetermined acquisition timing arrives; a detection step of detecting a decompressed state of the pneumatic tire based on the related value acquired by the acquisition step and a predetermined reference value; an update step of updating the reference value based on the related value acquired during a first period including the time when a predetermined update operation is accepted; and a determination step of determining whether the update operation is an incorrect operation based on the stopping status of the vehicle during a second period from the time when the decompressed state is detected to the time when the update operation is accepted.

[0201] According to this method, similar to the system of disclosed item (1), it is possible to prevent the update operation from being judged to be an incorrect operation when the decompression state is resolved by replacing the pneumatic tire.

[0202] Disclosed matter (10) is a program for causing one or more processors to execute the following steps: an acquisition step of acquiring a related value related to the air pressure of a pneumatic tire mounted on a vehicle based on the rotational speed of the pneumatic tire each time a predetermined acquisition timing arrives; a detection step of detecting a decompressed state of the pneumatic tire based on the related value acquired by the acquisition step and a predetermined reference value; an update step of updating the reference value based on the related value acquired during a first period including the time when a predetermined update operation is accepted; and a determination step of determining whether the update operation is an incorrect operation based on the stopping status of the vehicle during a second period from the time when the decompressed state is detected to the time when the update operation is accepted.

[0203] According to this program, similar to the system of disclosed item (1), it is possible to prevent the update operation from being determined to be an incorrect operation when the decompression state is resolved by replacing the pneumatic tire.

[0204] The present disclosure may also be a computer-readable recording medium that non-temporarily records the program of disclosure item (10). [Explanation of symbols]

[0205] 1 vehicle 2 tires 3 Server 4. Communication Network 11 Control section 12 Operation display section 13 Wheel speed sensor 14 Communications Department 15 GPS receiver 16 Memory section 21 CPU 22 ROM 23 RAM 31 Initialization button 41 Specific storage area 51 Control section 52 Operation display section 53 Communications Department 54 Storage section 61 CPU 62 ROM 63 RAM 71 First acquisition processing unit 72 Detection processing section 73 Update processing section 74 First determination processing unit 81 Search processing unit 82 Second acquisition processing unit 83 First notification processing unit 84 Second determination processing unit 85 Second notification processing unit 86 Third notification processing unit 100 Decompression detection system

Claims

1. a first acquisition processing unit that acquires a related value related to the air pressure of a pneumatic tire mounted on a vehicle based on a rotational speed of the pneumatic tire each time a predetermined acquisition timing arrives; a detection processing unit that detects a decompressed state of the pneumatic tire based on the associated value acquired by the first acquisition processing unit and a predetermined reference value; an update processing unit that, when a predetermined update operation is received, updates the reference value based on the related value acquired during a first period that includes the time when the update operation is received; a first determination processing unit that determines whether the update operation is an erroneous operation based on a stopped state of the vehicle during a second period from when the decompression state is detected to when the update operation is accepted; A reduced pressure state detection system comprising:

2. the first determination processing unit determines that the update operation is an erroneous operation when a duration of the stopped state of the vehicle during the second time period does not exceed a predetermined specific time. The reduced pressure detection system of claim 1 .

3. the first determination processing unit determines whether the update operation is an erroneous operation based on a stopping state and a stopping location of the vehicle during the second period; The reduced pressure state detection system according to claim 1 or 2.

4. the first determination processing unit determines whether the update operation is an erroneous operation based on a stopping state of the vehicle during the second period, the related value acquired during the second period, and the related value acquired after the second period has elapsed. The reduced pressure state detection system according to claim 1 or 2.

5. a search processing unit that searches for an establishment that can resolve the reduced pressure state when the first determination processing unit determines that the update operation is an incorrect operation; a second acquisition processing unit that acquires a specific route from the current location of the vehicle to a specific establishment that is closest to the establishments searched for by the search processing unit; a first notification processing unit that notifies a person inside the vehicle of the specific route; The decompression state detection system according to claim 1 or 2, comprising:

6. the search processing unit searches for the establishments located within a predetermined specific range from the current position of the vehicle; When the establishment cannot be found, the search processing unit searches for the establishment at each predetermined search timing until the establishment is found. The reduced pressure state detection system according to claim 5 .

7. a second determination processing unit that determines whether the vehicle is traveling along the specific route after the first notification processing unit notifies the vehicle of the specific route; a second notification processing unit that, when it is determined by the second determination processing unit that the vehicle is not traveling along the specific route, notifies a predetermined first notification destination outside the vehicle of this fact; The reduced pressure detection system according to claim 5 , comprising:

8. a second determination processing unit that determines whether the vehicle is traveling along the specific route after the first notification processing unit notifies the specific route; a third notification processing unit that, when the second determination processing unit determines that the vehicle is traveling along the specific route, notifies a second notification destination corresponding to the specific business establishment that the vehicle equipped with the pneumatic tire in the decompressed state is traveling toward the specific business establishment; and The reduced pressure detection system according to claim 5 , comprising:

9. an acquisition step of acquiring a related value related to the air pressure of a pneumatic tire mounted on a vehicle based on a rotational speed of the pneumatic tire each time a predetermined acquisition timing arrives; a detecting step of detecting a decompressed state of the pneumatic tire based on the related value acquired in the acquiring step and a predetermined reference value; an updating step of, when a predetermined update operation is received, updating the reference value based on the related value acquired during a first period including the time when the update operation is received; a determination step of determining whether the update operation is an erroneous operation based on a stopped state of the vehicle during a second period from when the decompression state is detected to when the update operation is accepted; A determination method executed by one or more processors.

10. an acquisition step of acquiring a related value related to the air pressure of a pneumatic tire mounted on a vehicle based on a rotational speed of the pneumatic tire each time a predetermined acquisition timing arrives; a detecting step of detecting a decompressed state of the pneumatic tire based on the related value acquired in the acquiring step and a predetermined reference value; an updating step of, when a predetermined update operation is received, updating the reference value based on the related value acquired during a first period including the time when the update operation is received; a determination step of determining whether the update operation is an erroneous operation based on a stopped state of the vehicle during a second period from when the decompression state is detected to when the update operation is accepted; A program for causing one or more processors to execute the above.

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