WO2023007715A1 - Wheel-securing member falloff detection system - Google Patents

Wheel-securing member falloff detection system Download PDF

Info

Publication number
WO2023007715A1
WO2023007715A1 PCT/JP2021/028405 JP2021028405W WO2023007715A1 WO 2023007715 A1 WO2023007715 A1 WO 2023007715A1 JP 2021028405 W JP2021028405 W JP 2021028405W WO 2023007715 A1 WO2023007715 A1 WO 2023007715A1
Authority
WO
WIPO (PCT)
Prior art keywords
fixing member
wheel fixing
transmitter
receiver
wheel
Prior art date
Application number
PCT/JP2021/028405
Other languages
French (fr)
Japanese (ja)
Inventor
泰久 辻田
智哉 河合
Original Assignee
太平洋工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 太平洋工業株式会社 filed Critical 太平洋工業株式会社
Priority to PCT/JP2021/028405 priority Critical patent/WO2023007715A1/en
Publication of WO2023007715A1 publication Critical patent/WO2023007715A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B3/00—Disc wheels, i.e. wheels with load-supporting disc body
    • B60B3/14—Attaching disc body to hub ; Wheel adapters
    • B60B3/16—Attaching disc body to hub ; Wheel adapters by bolts or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre

Definitions

  • the present disclosure relates to a wheel fixing member dropping detection system.
  • a vehicle includes multiple axles, multiple hubs, multiple wheels, and multiple wheel fixing members.
  • One hub is provided at each end of the axle.
  • the wheel is rotatable integrally with the axle by fastening a wheel fixing member to the hub.
  • the fastening state of the wheel fixing member may be inspected.
  • Patent Literature 1 discloses an indicator that is provided so as to rotate integrally with a wheel fixing member. When inspecting the fastening state of the wheel fixing member, the inspection is performed by an inspector visually checking the indicator.
  • the wheel fixing member Even if the wheel fixing member is inspected, the wheel fixing member may come off.
  • a wheel fixing member dropping detection system including a transmitter provided integrally with a wheel fixing member for fixing a wheel to an axle, and a receiver mounted on a vehicle.
  • the transmitter includes a transmitter storage unit configured to store identification information, and a transmission circuit configured to transmit a radio signal including the identification information
  • the receiver includes the A receiver control device configured to acquire the identification information included in the radio signal, wherein the receiver control device determines that the wheel fixing member has fallen off when the identification information is no longer acquired. configured to determine.
  • the transmitter When the wheel fixing member falls off, the transmitter also falls off together with the wheel fixing member. Due to the dropout of the transmitter, the receiver control device cannot acquire the identification information of the dropped transmitter. Therefore, the receiver control device can determine that the wheel fixing member has fallen off when the identification information is no longer acquired.
  • the wheel fixing member drop-off detection system is a repeater configured to receive the wireless signal and transmit a relay signal including the identification information included in the wireless signal. may further include
  • the repeater may be configured to transmit the relay signal including the identification information of a plurality of the transmitters.
  • the transmitter may include a battery, and the transmitter may be configured to transmit the wireless signal by power of the battery.
  • the wheel fixing member drop-off detection system further includes a road receiver configured to be installed on a road, wherein the road receiver is transmitted from the same transmitter. It may be configured such that it is determined that the wheel fixing member has fallen off when the wireless signal is repeatedly received for a predetermined time or longer or for a predetermined number of times or longer.
  • the repeater is a reading device capable of transmitting radio waves to the transmitter and configured to receive the wireless signal
  • the transmitter comprises:
  • the radio signal may be transmitted by power obtained from the radio wave.
  • the wheel fixing member drop-off detection system further includes a road receiver configured to be installed on a road, wherein the road receiver receives the relay signal transmitted from the repeater. It may be configured to determine from the signal that the wheel fixing member has fallen off.
  • the wheel fixing member falling detection system may further include a server and a communication device that transmits information indicating that the wheel fixing member has fallen off to the server. .
  • FIG. 1 is a schematic configuration diagram of a vehicle system in a first embodiment
  • FIG. 2 is a schematic configuration diagram of a vehicle included in the vehicle system of FIG. 1
  • FIG. 2 is an exploded perspective view of a hub included in the vehicle in FIG. 1, a wheel included in the vehicle in FIG. 1, and a wheel fixing member included in the vehicle in FIG. 1.
  • FIG. FIG. 2 is a schematic configuration diagram of a wheel fixing member dropping detection system included in the vehicle system of FIG. 1
  • FIG. 5 is a flow chart showing a first omission detection process performed by the transmitter and receiver of FIG. 4
  • FIG. FIG. 5 is a flowchart showing a second dropping detection process performed by the road receiver of FIG. 4
  • FIG. 3 is a schematic configuration diagram of the wheel fixing member dropping detection system in the embodiment of FIG. 2 ;
  • Figure 8 is a front view of the wheel showing the position where the reader of Figure 7 is provided;
  • FIG. 8 is a flow chart showing a relay process performed by the reading device of FIG. 7;
  • FIG. 8 is a flowchart showing a second dropping detection process performed by the road receiver of FIG. 7;
  • FIG. 11 is a schematic configuration diagram of a wheel fixing member falling-off detection system in a modified example;
  • the vehicle system 10 includes a vehicle 11 and a wheel fixing member dropping detection system 20 .
  • the wheel fixing member falling detection system 20 includes a transmitter 21 , a receiver 31 , a road receiver 41 and a server 51 .
  • the vehicle 11 includes a plurality of axles 12, a plurality of hubs 13, a plurality of wheels 15, a plurality of wheel fixing members 16, and a notification device 17.
  • Vehicle 11 may be of any type, such as a truck, passenger car, or commercial vehicle.
  • one hub 13 is provided at each end of the axle 12 .
  • the hub 13 can rotate integrally with the axle 12 .
  • the hub 13 has a plurality of hub bolts 14 .
  • the plurality of hub bolts 14 are spaced apart from each other in the rotational direction of the axle 12 .
  • the wheel 15 is fixed to the axle 12 by fastening a wheel fixing member 16 to the hub bolt 14 passing through the wheel 15 .
  • Wheel 15 is fixed to axle 12 via hub 13 .
  • a case where one wheel 15 is provided on each end of each axle 12 will be described. good too. That is, each end of the axle 12 may be provided with one wheel for a single tire, or two wheels for a double tire.
  • the wheel fixing member 16 is a wheel nut.
  • a wheel fixing member 16 is fastened to the hub 13 .
  • the wheel fixing member 16 is a wheel nut fastened to the hub bolt 14 provided on the hub 13 .
  • the transmitter 21 is provided integrally with the wheel fixing member 16. Transmitter 21 may be attached to wheel fixture 16 in any manner. For example, the transmitter 21 may be attached to the wheel fixing member 16 with an adhesive, or may be attached to the wheel fixing member 16 by being fitted into the wheel fixing member 16 .
  • the transmitter 21 includes a transmitter control device 22, a transmission circuit 25, a transmission antenna 26, and a battery 27.
  • the transmitter control device 22 includes a processor 23 and a transmitter storage section 24 .
  • the processor 23 include an MPU (Micro Processing Unit), a CPU (Central Processing Unit), and a DSP (Digital Signal Processor).
  • the transmitter storage unit 24 includes RAM (Random Access Memory) and ROM (Read Only Memory). Transmitter storage 24 stores program code or instructions configured to cause processor 23 to perform processing.
  • the transmitter control device 22 may be configured by a hardware circuit such as ASIC or FPGA.
  • the processing circuitry, transmitter controller 22, may include one or more processors operating according to a computer program, one or more hardware circuits such as ASICs or FPGAs, or a combination thereof.
  • ROM and RAM or computer-readable media include any available media that can be accessed by a general purpose or special purpose computer.
  • the transmitter storage unit 24 stores an ID code indicating unique identification information of the corresponding transmitter 21 .
  • the transmitter control device 22 generates data.
  • the data is digital data and binary data.
  • the data is data indicating an ID code.
  • the transmitter controller 22 inputs data to the transmitter circuit 25 .
  • the transmission circuit 25 transmits from the transmission antenna 26 a radio signal that has been modulated according to the data input from the transmitter control device 22 .
  • a radio signal including the ID code is transmitted from the transmission circuit 25 .
  • a radio signal is a signal in a predetermined frequency band. Examples of frequency bands include the LF band, MF band, HF band, VHF band, UHF band, and 2.4 GHz band.
  • the transmitter controller 22 is configured to cause the transmitter circuit 25 to transmit radio signals at predetermined transmission intervals.
  • the predetermined transmission interval may be a predetermined constant interval, or may be an interval that randomly fluctuates between a predetermined upper limit and lower limit.
  • the battery 27 is the power source for the transmitter 21 .
  • the battery 27 may be a primary battery or a secondary battery.
  • the transmitter 21 transmits radio signals by being supplied with power from the battery 27 .
  • the receiver 31 includes a receiver control device 32 , a receiving antenna 35 , a receiving circuit 36 and a communication device 37 .
  • Receiver 31 is mounted on vehicle 11 .
  • the receiver control device 32 includes a processor 33 and a storage section 34.
  • the processor 33 can include, for example, an MPU, CPU, and DSP.
  • the storage unit 34 includes ROM and RAM. Storage unit 34 stores program code or instructions configured to cause processor 33 to perform processing.
  • the receiver control device 32 may be configured by a hardware circuit such as ASIC or FPGA.
  • the processing circuitry, receiver controller 32 may include one or more processors operating according to a computer program, one or more hardware circuits such as ASICs or FPGAs, or a combination thereof.
  • ROM and RAM or computer-readable media include any available media that can be accessed by a general purpose or special purpose computer.
  • the ID codes of all the transmitters 21 are stored in the storage unit 34.
  • the ID code stored in the storage unit 34 may be associated with the position of the wheel fixing member 16 . That is, the ID code may be stored so that the receiver control device 32 can recognize the position of the transmitter 21 that transmitted the radio signal.
  • the position of the wheel fixing member 16 is the position of the wheel 15 on which the wheel fixing member 16 is provided. For example, in the case of the wheel fixing member 16 for fixing the wheel 15 provided on the front right of the vehicle 11, the ID code of the transmitter 21 provided on the wheel fixing member 16 is associated with the front right of the vehicle 11.
  • the receiving antenna 35 receives the radio signal transmitted from each transmitter 21 .
  • the receiving circuit 36 demodulates the radio signal received via the receiving antenna 35 to obtain data.
  • the receiving circuit 36 outputs data to the receiver controller 32 . As a result, the receiver control device 32 acquires the ID code.
  • the receiver control device 32 gives a command to the notification device 17.
  • the notification device 17 notifies according to the command.
  • the notification device 17 is a device for notifying passengers of the vehicle 11 that the wheel fixing member 16 has fallen off.
  • the notification device 17 may be any device, such as a device that notifies by sound, a device that notifies by lighting a lamp, or a device that notifies by displaying characters or marks.
  • the communication device 37 is a network device that includes a communication control unit, ports, etc., and can transmit and receive information through the communication network NW.
  • the communication device 37 is connected to the server 51 via the communication network NW.
  • the road receiver 41 includes a road receiver control device 42 , a road receiving antenna 45 , a road receiving circuit 46 and a road communication device 47 .
  • a plurality of road receivers 41 are provided at predetermined intervals along the road on which the vehicle 11 travels.
  • the road receiver control device 42 includes a processor 43 and a storage unit 44 .
  • the processor 43 can include, for example, an MPU, CPU, and DSP.
  • the storage unit 44 includes ROM and RAM. Storage unit 44 stores program code or instructions configured to cause processor 43 to perform processing.
  • the road receiver control device 42 may be configured by a hardware circuit such as ASIC or FPGA.
  • the processing circuitry roadway receiver controller 42 may include one or more processors operating according to a computer program, one or more hardware circuits such as ASICs or FPGAs, or a combination thereof.
  • ROM and RAM or computer-readable media include any available media that can be accessed by a general purpose or special purpose computer.
  • the road receiving antenna 45 receives the radio signal transmitted from each transmitter 21 .
  • the road reception circuit 46 demodulates the radio signal received via the road reception antenna 45 to obtain data.
  • the road receiving circuit 46 outputs the data to the road receiver control device 42 . As a result, the road receiving circuit 46 acquires the ID code.
  • the road communication device 47 is a network device that includes a communication control unit, ports, etc., and can transmit and receive information through the communication network NW.
  • the road communication device 47 is connected to the server 51 via the communication network NW.
  • the transmitter 21 and receiver 31 perform the first omission detection process.
  • the first omission detection process is repeatedly performed at a predetermined cycle.
  • step S1 the transmitter control device 22 transmits radio signals.
  • step S2 the receiver control device 32 acquires an ID code from the radio signal.
  • the receiver control device 32 determines whether any wheel fixing member 16 has fallen off. For each ID code stored in the storage unit 34, the receiver control device 32 determines whether or not the ID code has been acquired from the radio signal. Depending on the surrounding environment, the receiver 31 may not be able to receive the radio signal even though the transmitter 21 is transmitting the radio signal. Therefore, if the same ID code has not been obtained continuously for a predetermined time or longer, the receiver control device 32 determines that the ID code has not been obtained. When the ID codes of all the transmitters 21 are acquired, the receiver control device 32 determines that none of the wheel fixing members 16 has fallen off. If the receiver control device 32 cannot acquire the ID code of at least one transmitter 21, it determines that one of the wheel fixing members 16 has fallen off.
  • the receiver control device 32 Since the ID code is transmitted by a radio signal, it can be said that the receiver control device 32 detects the dropout of the wheel fixing member 16 based on the presence or absence of the radio signal. If the storage unit 34 stores the position of the wheel 15 in association with the ID code, the receiver control device 32 may identify the position of the dropped wheel fixing member 16 . When the ID code cannot be acquired, the receiver control device 32 may determine that the wheel fixing member 16 provided at the position of the wheel 15 associated with the ID code is loose. For example, if the front right of the vehicle 11 is associated with the unacquirable ID code as the position of the wheel fixing member 16, the receiver control device 32 determines the wheel for fixing the front right wheel 15 of the vehicle 11. It may be determined that the fixing member 16 has loosened. If the determination result of step S3 is affirmative, the receiver control device 32 performs the processing of step S4. If the determination result in step S3 is negative, the receiver control device 32 terminates the first omission detection process.
  • step S4 the receiver control device 32 notifies the notification device 17.
  • step S5 the receiver control device 32 transmits information to the server 51 indicating that the wheel fixing member 16 has fallen off.
  • the receiver control device 32 may transmit information indicating the current position of the vehicle 11 to the server 51 .
  • Information indicating the current position of the vehicle 11 can be obtained from, for example, a satellite navigation device mounted on the vehicle 11 . Satellite navigation devices measure positions using satellite signals transmitted from GNSS (Global Navigation Satellite System) satellites.
  • GNSS Global Navigation Satellite System
  • the road receiver 41 performs the second omission detection process.
  • the second omission detection process is repeatedly performed at a predetermined cycle.
  • the second dropping detection process is a process of determining whether or not the dropped wheel fixing member 16 exists on the road.
  • step S11 the road receiver control device 42 acquires an ID code from the radio signal.
  • step S12 the road receiver control device 42 determines whether or not the wheel fixing member 16 has fallen off, in other words, whether or not it has fallen on the road.
  • the road receiver control device 42 judges that the wheel fixing member 16 has fallen off when the wireless signal transmitted from the same transmitter 21 is repeatedly and continuously received. Specifically, if the same ID code is repeatedly acquired for a predetermined time or more, or a predetermined number of times, the road receiver control device 42 detects that the wheel fixing member 16 has fallen off. determined to be
  • the predetermined time is set to be longer than the time required for the vehicle 11 to stop temporarily due to a road sign or signal. The predetermined number of times is set similarly to the predetermined time. If the determination result of step S12 is affirmative, the road receiver control device 42 performs the processing of step S13. If the determination result in step S12 is negative, the road receiver control device 42 terminates the second dropping detection process.
  • step S13 the road receiver control device 42 transmits information to the server 51 indicating that the wheel fixing member 16 has fallen off.
  • the road receiver control device 42 may transmit information indicating the position of the road receiver 41 to the server 51 . Since the position of the road receiver 41 does not change, information indicating the position of the road receiver 41 may be stored in advance in the storage unit 44 and this information may be transmitted to the server 51 . Further, the road receiver control device 42 may transmit to the server 51 information from which the server 51 can derive the position of the road receiver 41 . For example, if the server 51 has a database that stores the position in association with the ID code of the road receiver 41, the road receiver control device 42 transmits the ID code of the road receiver 41. good too. After completing the process of step S13, the road receiver control device 42 ends the second dropping detection process.
  • information indicating that the wheel fixing member 16 has fallen off is transmitted from the receiver 31 and the road receiver 41 to the server 51 .
  • the server 51 can recognize that the wheel fixing member 16 has come off.
  • the current position of the vehicle 11 can be regarded as the position where the wheel fixing member 16 has fallen off.
  • the position of the road receiver 41 can be regarded as the position where the wheel fixing member 16 has fallen off.
  • the server 51 provides services to users. Services are provided as a cloud. A cloud is one form of computer usage that accumulates data and provides services. One of the services is the provision of information regarding the detachment of the wheel fixing member 16 . As shown in FIG. 4, the server 51 is configured to be able to transmit information to the external device 52 . Examples of the external device 52 include a communication terminal and an electronic bulletin board provided on the road. Communication terminals include smartphones, tablet terminals, and personal computers. The electronic bulletin board is arranged at a position visible to passengers of the vehicle 11 . The server 51 provides the communication terminal with information regarding the detachment of the wheel fixing member 16 through at least one of the web browser and application.
  • the communication terminal displays the position where the wheel fixing member 16 has fallen off on the display unit, or reads out the position where the wheel fixing member 16 has fallen off, so that the user can understand that the wheel fixing member 16 has fallen off. Notifies you of your location.
  • the server 51 provides the electronic bulletin board with information on the detachment of the wheel fixing member 16 . At this time, the server 51 provides information on the detachment of the wheel fixing member 16 to electronic bulletin boards within a predetermined range from the position where the wheel fixing member 16 is detached. On the electronic bulletin board, a display for calling attention to passengers of the vehicle 11 is performed. For example, the electronic bulletin board displays a message to the effect that the wheel fixing member 16 may be detached.
  • the transmitter 21 also drops from the vehicle 11 together with the wheel fixing member 16.
  • the receiver control device 32 cannot receive radio signals.
  • the receiver control device 32 cannot acquire the ID code of the transmitter 21 . Thereby, the receiver control device 32 can detect that the wheel fixing member 16 has fallen off the vehicle 11 .
  • the wheel fixing member 16 When the wheel fixing member 16 falls off the vehicle 11, the wheel fixing member 16 does not move with the vehicle 11 and tends to remain at a fixed position on the road. Therefore, when the wheel fixing member 16 falls off, the radio signal transmitted from the transmitter 21 provided on the wheel fixing member 16 is likely to be continuously received by the same road receiver 41 . Even if the vehicle 11 passes near the road receiver 41 or the vehicle 11 temporarily stops near the road receiver 41, the radio signal from the transmitter 21 can be received for the road. machine 41 receives. However, in this case the radio signal is only temporarily received. Therefore, the road receiver control device 42 can determine that the wheel fixing member 16 has fallen off when the same ID code is repeatedly received in succession.
  • the wheel fixing member detachment detection system 20 includes a transmitter 21 and a receiver 31.
  • the transmitter 21 is provided integrally with the wheel fixing member 16 . Therefore, when the wheel fixing member 16 drops from the vehicle 11 , the transmitter 21 also drops from the vehicle 11 together with the wheel fixing member 16 . Due to the dropout of the transmitter 21 , the receiver control device 32 cannot obtain the ID code of the dropped transmitter 21 . Therefore, the receiver control device 32 can determine that the wheel fixing member 16 has fallen off when the ID code is no longer acquired.
  • the transmitter 21 has a battery 27 .
  • the transmitter 21 is capable of transmitting radio signals with the power of the battery 27 .
  • the wheel fixing member dropping detection system 20 includes a road receiver 41 .
  • the road receiver 41 determines that the wheel fixing member 16 has fallen off when the same ID code is repeatedly received.
  • the drop of the wheel fixing member 16 can be detected by the road receiver 41 .
  • the wheel fixing member dropping detection system 20 includes a server 51 .
  • the server 51 provides the external device 52 with information regarding the detachment of the wheel fixing member 16 . Thereby, the user can be notified that the wheel fixing member 16 has fallen off.
  • the receiver control device 32 detects the detachment of the wheel fixing member 16 from the ID code. Even if the transmitter 21 does not have a sensor for detecting the detachment of the wheel fixing member 16, the receiver control device 32 can detect the detachment of the wheel fixing member 16. FIG. Therefore, the manufacturing cost of the transmitter 21 can be reduced compared to the case where the transmitter 21 includes a sensor for detecting the detachment of the wheel fixing member 16 .
  • the wheel fixing member dropping detection system 20 includes a relay unit 60 .
  • One relay unit 60 is provided for each wheel 15 .
  • the relay unit 60 includes a reader 61 and a power generator 71 .
  • the reader 61 is a reader/writer used for RFID (Radio Frequency Identification) tags.
  • the reader 61 includes a reader controller 62 , a reader transmission/reception antenna 65 , a reader transmission/reception circuit 66 , a reader transmission circuit 67 , and a reader transmission antenna 68 .
  • the reader controller 62 includes a processor 63 and a storage unit 64 .
  • the processor 63 can include, for example, an MPU, CPU, and DSP.
  • the storage unit 64 includes ROM and RAM. Storage unit 64 stores program code or instructions configured to cause processor 63 to perform processing.
  • the reader controller 62 may be configured by a hardware circuit such as ASIC or FPGA.
  • the processing circuitry, receiver controller 32 may include one or more processors operating according to a computer program, one or more hardware circuits such as ASICs or FPGAs, or a combination thereof.
  • ROM and RAM or computer-readable media include any available media that can be accessed by a general purpose or special purpose computer.
  • the reading device transmitting/receiving antenna 65 transmits a radio signal to the transmitter 81 .
  • the reader transmitting/receiving antenna 65 receives the radio signal transmitted from the transmitter 81 .
  • the reader transmitting/receiving circuit 66 is capable of transmitting, from the reader transmitting/receiving antenna 65, a radio signal that has been modulated according to the data input from the reader control device 62.
  • the reader transmission/reception circuit 66 can obtain data by demodulating the radio signal received via the reader transmission/reception antenna 65 .
  • the reader transmission/reception circuit 66 outputs the data obtained by demodulating the radio signal to the reader controller 62 .
  • the reader transmission circuit 67 transmits from the reader transmission antenna 68 a radio signal that has been modulated according to the data input from the reader control device 62 .
  • a radio signal transmitted from the reader transmission circuit 67 is transmitted to the receiver 31 .
  • the power generation device 71 generates power by at least one of the rotation of the wheel 15 and the vibration of the wheel 15 .
  • the power generation device 71 for example, a device using a piezoelectric element can be used.
  • the reading device 61 operates with electric power generated by the power generation device 71 .
  • the relay unit 60 may include a power storage device that stores power generated by the power generation device 71 . In this case, surplus power not consumed by the reading device 61 out of the power generated by the power generation device 71 is stored in the power storage device. As a result, even when the power generation device 71 does not generate power, the reading device 61 can be operated with power from the power storage device. Examples of power storage devices include secondary batteries and capacitors.
  • the relay unit 60 is provided on the wheel 15, for example.
  • the relay unit 60 is provided so that the reading device 61 can receive a radio signal from a transmitter 81 provided on the same wheel 15 as the wheel 15 on which the relay unit 60 is provided.
  • the relay unit 60 is provided so that the reading device 61 cannot receive a wireless signal provided on a wheel 15 different from the wheel 15 on which the relay unit 60 is provided.
  • the relay unit 60 may be provided on the hub 13 .
  • the transmitter 81 of this embodiment is a passive RFID tag.
  • a passive RFID tag does not have a battery and operates using radio signals, which are radio waves transmitted from the reader 61, as an energy source.
  • the transmitter 81 includes a transmitter control device 82 , a transmitter transmission/reception circuit 85 , and a transmitter transmission/reception antenna 86 .
  • the transmitter transmitting/receiving circuit 85 is capable of transmitting, from the transmitter transmitting/receiving antenna 86, a radio signal that has been modulated according to the data input from the transmitter control device 82.
  • the transmitter transmission/reception circuit 85 can obtain data by demodulating the radio signal received via the transmitter transmission/reception antenna 86 .
  • the transmitter transmitting/receiving circuit 85 outputs data obtained by demodulating the radio signal to the transmitter control device 82 .
  • the hardware configuration of the transmitter control device 82 is, for example, the same as the transmitter control device 22 of the first embodiment.
  • the transmitter control device 82 includes a processor 83 and a storage section 84 .
  • the transmitter control device 82 transmits the radio signal from the transmitting/receiving circuit 85 for the transmitter.
  • This radio signal contains the ID code stored in the storage unit 84 . That is, the transmitter 81 returns the ID code in response to the request from the reader 61 .
  • the relay processing performed by the reading device 61 will be described.
  • the relay process is a process of relaying the ID code of the transmitter 81 and transmitting it to the receiver 31 .
  • the reader controller 62 transmits a radio signal from the reader transmitter/receiver circuit 66.
  • the radio signal is a signal requesting the transmitter 81 to return the ID code.
  • this radio signal is a radio wave that serves as an energy source for operating the transmitter 81 .
  • step S22 the reader controller 62 acquires an ID code from the received wireless signal.
  • the transmitter 81 transmits the radio signal including the ID code.
  • the reader controller 62 acquires the ID code obtained by demodulating the radio signal.
  • step S23 the reader control device 62 determines whether or not the same number of ID codes as the wheel fixing members 16 have been acquired.
  • the number of wheel fixing members 16 referred to here is the number of wheel fixing members 16 when the wheel fixing members 16 are not dropped. In other words, it is the maximum number of wheel fixing members 16 that fix one wheel 15 .
  • a transmitter 81 provided in each wheel fixing member 16 transmits a radio signal in response to a radio signal from the reader controller 62 . Therefore, when the wheel fixing member 16 has not fallen off the vehicle 11 , the reader control device 62 obtains the same number of ID codes as the wheel fixing members 16 . If the determination result of step S23 is affirmative, the reader control device 62 performs the process of step S25. If the determination result of step S23 is negative, the reader controller 62 performs the process of step S24.
  • step S24 the reader control device 62 determines whether or not a predetermined time has passed.
  • the predetermined time is the elapsed time from the start of the second omission detection process. When the second omission detection process ends, the elapsed time is reset.
  • the predetermined time is set to a time during which radio signals from all the transmitters 81 can be received, taking into consideration that radio signals cannot be received due to, for example, the surrounding environment. If the determination result of step S24 is negative, the reader controller 62 performs the process of step S23. When the process of step S24 is affirmative, the reader controller 62 performs the process of step S25.
  • step S25 the reader controller 62 transmits a radio signal from the reader transmitter circuit 67.
  • This radio signal is a radio signal generated according to the ID code acquired in step S23. That is, the radio signal includes the ID codes of the plurality of transmitters 81 acquired in step S23. If it is determined in step S23 that the ID codes of all the transmitters 81 provided on the same wheel 15 have been obtained, the radio transmission including the ID codes of all the transmitters 81 provided on the same wheel 15 is performed. A signal is sent. When the process of step S25 is performed by making an affirmative determination in step S24, the ID codes of all the transmitters 81 provided on the same wheel 15 have not been acquired. In this case, the reader controller 62 transmits a radio signal containing the obtained ID code.
  • the radio signal transmitted in step S25 includes information indicating the maximum number of wheel fixing members 16 provided on the same wheel 15 .
  • the radio signal transmitted in step S25 is transmitted to the receiver 31.
  • FIG. The reader controller 62 is a repeater configured to receive the radio signal from the transmitter 81 and transmit the ID code included in the radio signal to the receiver 31 .
  • the radio signal transmitted toward the receiver 31 in step S25 is a relay signal.
  • the receiver 31 Upon receiving the radio signal transmitted from the reading device 61, the receiver 31 determines whether or not the wheel fixing member 16 has fallen off by performing the first drop detection process similar to that of the first embodiment. That is, the receiver 31 determines whether or not the wheel fixing member 16 has fallen off based on whether or not the ID code has been acquired.
  • step S31 the road receiver control device 42 acquires an ID code from the relay unit 60 of the vehicle 11 traveling on the road or temporarily stopped on the road.
  • This ID code is obtained by demodulating the radio signal transmitted from the relay unit 60 in step S25, that is, the relay signal. Further, the road receiver control device 42 acquires information indicating the maximum number of wheel fixing members 16 provided on the same wheel 15 from the radio signal similarly transmitted by the relay unit 60 .
  • step S32 the road receiver control device 42 determines whether or not the number of ID codes obtained from the radio signal matches the maximum number of wheel fixing members 16 provided on the same wheel 15. judge. When the wheel fixing members 16 fall off the vehicle 11, the number of ID codes becomes smaller than the maximum number of wheel fixing members 16. ⁇ Therefore, by determining whether or not the number of ID codes matches the maximum number of wheel fixing members 16, it is possible to determine whether or not the wheel fixing member 16 has fallen off. If the number of ID codes matches the maximum number of wheel fixing members 16, the road receiver controller 42 determines that the wheel fixing members 16 have not fallen off. If the number of ID codes does not match the maximum number of wheel fixing members 16, the road receiver controller 42 determines that the wheel fixing member 16 has fallen off. If the determination result in step S32 is affirmative, the road receiver control device 42 terminates the second dropping detection process. If the determination result of step S32 is negative, the road receiver control device 42 performs the processing of step S33.
  • step S33 the road receiver control device 42 transmits information to the server 51 indicating that the wheel fixing member 16 has fallen off.
  • the processing of step S33 is the same as the processing of step S13.
  • the reading device 61 acquires the ID code of the transmitter 81 and transmits to the receiver 31 a radio signal including the acquired ID code.
  • the reader 61 can relay the ID code. Therefore, even if the receiver 31 cannot directly receive the radio signal from the transmitter 81 due to the communicable distance of the transmitter 81, the difference in the communication method between the transmitter 81 and the receiver 31, etc. , the receiver 31 can acquire the ID code.
  • the reading device 61 transmits a radio signal including the ID codes of the multiple transmitters 81 to the receiver 31 .
  • the frequency of transmission can be reduced compared to the case where a radio signal is transmitted each time an ID code is acquired.
  • the road receiver 41 determines whether or not the wheel fixing member 16 has fallen off based on the radio signal from the reading device 61 .
  • the drop of the wheel fixing member 16 can be detected by the road receiver 41 .
  • a passive RFID tag is used as the transmitter 81 . Therefore, the transmitter 81 does not have to be equipped with a battery. The weight of the transmitter 81 can be reduced as compared with the case where the transmitter 81 includes a battery. Moreover, since there is no need to consider the remaining capacity of the battery, the transmitter 81 can be used for a long period of time.
  • the reading device 61 operates with electric power from a power generation device 71 that uses the rotation and vibration of the wheel 15 to generate power. Compared to the case where the reading device 61 is operated using a battery, it is not necessary to consider the remaining capacity of the battery.
  • the road receiver 41 may include a road notification device.
  • the road notification device may be any device, such as a device that notifies by sound, a device that notifies by lighting a lamp, or a device that notifies by displaying characters or marks.
  • the road receiver control device 42 may make a notification through the road notification device. As a result, it is possible to notify the surroundings of the road receiver 41 that there is a possibility that the wheel fixing member 16 has fallen off.
  • the wheel fixing member falling-off detection system 20 may not include the server 51 .
  • the road receiver 41 preferably includes the road notification device described above.
  • the wheel fixing member dropping detection system 20 does not have to include the road receiver 41 .
  • the wheel fixing member dropping detection system 20 may include a repeater 91 .
  • the repeaters 91 are provided on the vehicle 11 one by one corresponding to the wheels 15 .
  • the repeater 91 is configured to receive a radio signal from the transmitter 21 and transmit a relay signal containing the ID code included in the radio signal to the receiver 31 .
  • the receiver 31 can acquire the ID code.
  • the repeater 91 may perform relay processing similar to that of the reading device 61 of the second embodiment.
  • the road receiver 41 can detect the detachment of the wheel fixing member 16 by performing the second detachment detection process similar to that of the second embodiment.
  • the road receiver 41 may include a road reader.
  • the road reader is a device similar to the reader 61 .
  • a road reader periodically transmits a radio signal.
  • the transmitter 81 receives this radio signal, the transmitter 81 transmits a radio signal containing the ID code.
  • the road reader determines that the wheel fixing member 16 has fallen off when the same ID code is repeatedly received, that is, when the radio signal transmitted from the same transmitter 81 is repeatedly received. do.
  • the reading device 61 may be configured to operate with the battery 27 .
  • the radio signal transmitted in step S25 may not include information indicating the maximum number of wheel fixing members 16 provided on the same wheel 15 .
  • the radio signal transmitted in step S25 may include information that allows the road receiver 41 to indirectly recognize the maximum number of wheel fixing members 16 .
  • the radio signal transmitted in step S25 may include the vehicle identification number and the ID code of the reader 61.
  • FIG. The road receiver 41 may recognize the vehicle type of the vehicle 11 from the vehicle identification number, and may recognize the maximum number of wheel fixing members 16 from the vehicle type.
  • the ID codes of the reading device 61 are grouped according to the maximum number of wheel fixing members 16 .
  • the road receiver 41 can recognize the maximum number of wheel fixing members 16 from the ID code of the reader 61 .
  • the ID codes of the transmitters 81 may be grouped according to the maximum number of wheel fixing members 16 .
  • the road receiver 41 can recognize the maximum number of wheel fixing members 16 from the obtained ID code.
  • step S24 If the result of step S24 is affirmative, in other words, if the ID code is missing, the missing ID code data is transmitted as data not used by the transmitter 81 in step S25. good too. If the acquired ID code includes an ID code that is not used by the transmitter 81, the road receiver 41 can determine that the wheel fixing member 16 has fallen off.
  • the reading device 61 may determine whether or not the wheel fixing member 16 has fallen off.
  • the ID code of the transmitter 81 is stored in the storage unit 64 of the reading device 61, and the reading device 61 performs the same processing as the first removal detection processing, thereby determining whether or not the wheel fixing member 16 has fallen off. can.
  • the reading device 61 may transmit information indicating that the wheel fixing member 16 has fallen off to the road receiver 41 .
  • reader 61 is the receiver.
  • the wheel fixing member detachment detection system 20 may or may not include the receiver 31 .
  • the reading device 61 sends information indicating that the wheel fixing member 16 has fallen off to the receiver 31 when determining that the wheel fixing member 16 has fallen off. You may send. If the wheel fixing member drop-off detection system 20 does not include the receiver 31 , the relay unit 60 may include the communication device 37 . The reader controller 62 transmits information to the server 51 indicating that the wheel fixing member 16 has fallen off.
  • the reader 61 may not be provided for each wheel 15 .
  • the wheel fixing member drop-off detection system 20 may include one reader 61 .
  • one reader 61 acquires the ID code of the transmitter 81 provided on each wheel 15 and transmits it to the receiver 31 .
  • the reader control device 62 may transmit a radio signal including the ID code to the receiver 31 every time it acquires the ID code.
  • the wheel fixing member 16 may be a wheel bolt. If the wheel fixing member 16 is a wheel bolt, the hub 13 has a bolt hole instead of the hub bolt 14 . Wheel bolts are inserted into the bolt holes. The wheel bolt is thereby fastened to the hub 13 . A wheel 15 is fixed to the axle 12 by a wheel bolt.
  • a wheel bolt has a shaft and a head.
  • the shaft is inserted into the bolt hole.
  • Transmitters 21, 81 are attached to the head.
  • the transmitters 21 and 81 are attached to the opposite surface of the axial end surface of the head, to the surface on which the shaft portion is provided.
  • the transmitters 21 and 81 may be attached to the wheel bolts with an adhesive, or may be attached to the wheel bolts by being fitted into the wheel bolts.
  • the transmitters 21 and 81 may be provided integrally with the wheel fixing member 16 and may be attached to a nut cap attached to the wheel fixing member 16 . That is, the transmitters 21 and 81 may drop out of the vehicle 11 together with the wheel fixing member 16 when the wheel fixing member 16 drops out of the vehicle 11 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

A wheel-securing member falloff detection system (20) comprises a transmitter (21) integrally provided with a wheel-securing member (16) for securing a wheel (15) to an axle (12),and a receiver (31) installed in a vehicle (11). The transmitter (21) is provided with a transmitter storage unit (24) configured so as to store identification information, and a transmission circuit (25) configured so as to transmit a wireless signal including the identification information. The receiver (31) is provided with a receiver control device (32) that acquires the identification information included in the wireless signal. The receiver control device (32) is configured so as to determine that the wheel-securing member (16) has fallen off upon no longer acquiring the identification information.

Description

ホイール固定部材脱落検知システムWheel fixing member dropping detection system
　本開示は、ホイール固定部材脱落検知システムに関する。 The present disclosure relates to a wheel fixing member dropping detection system.
　車両は、複数の車軸と、複数のハブと、複数のホイールと、複数のホイール固定部材と、を備える。ハブは、車軸の両端に１つずつ設けられている。ホイールは、ハブにホイール固定部材が締結されることで車軸と一体回転可能に設けられている。ホイール固定部材がハブから脱落することを抑制するため、ホイール固定部材の締結状態の検査が行われる場合がある。例えば、特許文献１には、ホイール固定部材と一体回転するように設けられるインジケータが開示されている。ホイール固定部材の締結状態を検査する際には、点検者がインジケータを目視することで検査が行われる。 A vehicle includes multiple axles, multiple hubs, multiple wheels, and multiple wheel fixing members. One hub is provided at each end of the axle. The wheel is rotatable integrally with the axle by fastening a wheel fixing member to the hub. In order to prevent the wheel fixing member from falling off from the hub, the fastening state of the wheel fixing member may be inspected. For example, Patent Literature 1 discloses an indicator that is provided so as to rotate integrally with a wheel fixing member. When inspecting the fastening state of the wheel fixing member, the inspection is performed by an inspector visually checking the indicator.
特開２０１５－１８６９５１号公報JP 2015-186951 A
　ホイール固定部材の検査を行った場合であっても、ホイール固定部材の脱落が生じる場合がある。 　Even if the wheel fixing member is inspected, the wheel fixing member may come off.
　本開示の第一の態様によれば、ホイールを車軸に固定するためのホイール固定部材と一体に設けられた送信機と、車両に搭載された受信機と、を備えたホイール固定部材脱落検知システムが提供される。前記送信機は、識別情報を記憶するように構成された送信機用記憶部と、前記識別情報を含む無線信号を送信するように構成された送信回路と、を備え、前記受信機は、前記無線信号に含まれる前記識別情報を取得するように構成された受信機用制御装置を備え、前記受信機用制御装置は、前記識別情報を取得しなくなった場合に前記ホイール固定部材が脱落したと判定するように構成されている。 According to a first aspect of the present disclosure, a wheel fixing member dropping detection system including a transmitter provided integrally with a wheel fixing member for fixing a wheel to an axle, and a receiver mounted on a vehicle is provided. The transmitter includes a transmitter storage unit configured to store identification information, and a transmission circuit configured to transmit a radio signal including the identification information, and the receiver includes the A receiver control device configured to acquire the identification information included in the radio signal, wherein the receiver control device determines that the wheel fixing member has fallen off when the identification information is no longer acquired. configured to determine.
　ホイール固定部材が脱落した場合には、ホイール固定部材とともに送信機も脱落する。送信機の脱落によって、受信機用制御装置は脱落した送信機の識別情報を取得できなくなる。このため、受信機用制御装置は、識別情報を取得しなくなった場合にホイール固定部材が脱落したと判定することができる。 When the wheel fixing member falls off, the transmitter also falls off together with the wheel fixing member. Due to the dropout of the transmitter, the receiver control device cannot acquire the identification information of the dropped transmitter. Therefore, the receiver control device can determine that the wheel fixing member has fallen off when the identification information is no longer acquired.
　上記ホイール固定部材脱落検知システムについて、前記ホイール固定部材脱落検知システムは、前記無線信号を受信して、当該無線信号に含まれる前記識別情報を含んだ中継信号を送信するように構成されているリピータをさらに備えていてもよい。 In the wheel fixing member drop-off detection system, the wheel fixing member drop-off detection system is a repeater configured to receive the wireless signal and transmit a relay signal including the identification information included in the wireless signal. may further include
　上記ホイール固定部材脱落検知システムについて、前記リピータは、複数の前記送信機の前記識別情報を含む前記中継信号を送信するように構成されていてもよい。 In the above wheel fixing member drop-off detection system, the repeater may be configured to transmit the relay signal including the identification information of a plurality of the transmitters.
　上記ホイール固定部材脱落検知システムについて、前記送信機は、バッテリを備え、前記送信機は、前記バッテリの電力によって前記無線信号を送信するように構成されていてもよい。 With regard to the above-described wheel fixing member drop-off detection system, the transmitter may include a battery, and the transmitter may be configured to transmit the wireless signal by power of the battery.
　上記ホイール固定部材脱落検知システムについて、前記ホイール固定部材脱落検知システムは、道路に設けられるように構成された道路用受信機をさらに備え、前記道路用受信機は、同一の前記送信機から送信された無線信号を予め定められた時間以上、あるいは、予め定められた回数以上、繰り返し受信した場合に前記ホイール固定部材が脱落したと判定するように構成されていてもよい。 With respect to the wheel fixing member drop-off detection system, the wheel fixing member drop-off detection system further includes a road receiver configured to be installed on a road, wherein the road receiver is transmitted from the same transmitter. It may be configured such that it is determined that the wheel fixing member has fallen off when the wireless signal is repeatedly received for a predetermined time or longer or for a predetermined number of times or longer.
　上記ホイール固定部材脱落検知システムについて、前記リピータは、前記送信機に電波を送信することが可能であり、かつ、前記無線信号を受信するように構成された読取装置であり、前記送信機は、前記電波から得られた電力によって前記無線信号を送信するように構成されていてもよい。 In the above wheel fixing member drop-off detection system, the repeater is a reading device capable of transmitting radio waves to the transmitter and configured to receive the wireless signal, and the transmitter comprises: The radio signal may be transmitted by power obtained from the radio wave.
　上記ホイール固定部材脱落検知システムについて、前記ホイール固定部材脱落検知システムは、道路に設けられるように構成された道路用受信機をさらに備え、前記道路用受信機は、前記リピータから送信された前記中継信号から前記ホイール固定部材が脱落したことを判定するように構成されていてもよい。 In the above wheel fixing member drop-off detection system, the wheel fixing member drop-off detection system further includes a road receiver configured to be installed on a road, wherein the road receiver receives the relay signal transmitted from the repeater. It may be configured to determine from the signal that the wheel fixing member has fallen off.
　上記ホイール固定部材脱落検知システムについて、前記ホイール固定部材脱落検知システムは、サーバーと、前記サーバーに、前記ホイール固定部材が脱落したことを示す情報を送信する通信装置と、をさらに備えていてもよい。 The wheel fixing member falling detection system may further include a server and a communication device that transmits information indicating that the wheel fixing member has fallen off to the server. .
第１実施形態における車両用システムの概略構成図である。1 is a schematic configuration diagram of a vehicle system in a first embodiment; FIG. 図１の車両用システムが備える車両の概略構成図である。2 is a schematic configuration diagram of a vehicle included in the vehicle system of FIG. 1; FIG. 図１の車両が備えるハブ、図１の車両が備えるホイール、及び図１の車両が備えるホイール固定部材の分解斜視図である。2 is an exploded perspective view of a hub included in the vehicle in FIG. 1, a wheel included in the vehicle in FIG. 1, and a wheel fixing member included in the vehicle in FIG. 1. FIG. 図１の車両用システムが備えるホイール固定部材脱落検知システムの概略構成図である。FIG. 2 is a schematic configuration diagram of a wheel fixing member dropping detection system included in the vehicle system of FIG. 1 ; 図４の送信機及び受信機で行われる第１脱落検知処理を示すフローチャートである。FIG. 5 is a flow chart showing a first omission detection process performed by the transmitter and receiver of FIG. 4; FIG. 図４の道路用受信機で行われる第２脱落検知処理を示すフローチャートである。FIG. 5 is a flowchart showing a second dropping detection process performed by the road receiver of FIG. 4; FIG. 図２実施形態におけるホイール固定部材脱落検知システムの概略構成図である。FIG. 3 is a schematic configuration diagram of the wheel fixing member dropping detection system in the embodiment of FIG. 2 ; 図７の読取装置が設けられる位置を示すホイールの正面図である。Figure 8 is a front view of the wheel showing the position where the reader of Figure 7 is provided; 図７の読取装置で行われる中継処理を示すフローチャートである。FIG. 8 is a flow chart showing a relay process performed by the reading device of FIG. 7; FIG. 図７の道路用受信機で行われる第２脱落検知処理を示すフローチャートである。FIG. 8 is a flowchart showing a second dropping detection process performed by the road receiver of FIG. 7; FIG. 変形例におけるホイール固定部材脱落検知システムの概略構成図である。FIG. 11 is a schematic configuration diagram of a wheel fixing member falling-off detection system in a modified example;
　（第１実施形態）
　以下、ホイール固定部材脱落検知システムの第１実施形態について説明する。 (First embodiment)
A first embodiment of the wheel fixing member dropping detection system will be described below.
　図１に示すように、車両用システム１０は、車両１１と、ホイール固定部材脱落検知システム２０と、を備える。ホイール固定部材脱落検知システム２０は、送信機２１と、受信機３１と、道路用受信機４１と、サーバー５１と、を備える。 As shown in FIG. 1 , the vehicle system 10 includes a vehicle 11 and a wheel fixing member dropping detection system 20 . The wheel fixing member falling detection system 20 includes a transmitter 21 , a receiver 31 , a road receiver 41 and a server 51 .
　図２に示すように、車両１１は、複数の車軸１２と、複数のハブ１３と、複数のホイール１５と、複数のホイール固定部材１６と、通知装置１７と、を備える。車両１１はトラック、乗用車、商用車など、どのような種類のものであってもよい。 As shown in FIG. 2, the vehicle 11 includes a plurality of axles 12, a plurality of hubs 13, a plurality of wheels 15, a plurality of wheel fixing members 16, and a notification device 17. Vehicle 11 may be of any type, such as a truck, passenger car, or commercial vehicle.
　図３に示すように、ハブ１３は、車軸１２の両端に１つずつ設けられている。ハブ１３は、車軸１２と一体回転可能である。ハブ１３は、複数のハブボルト１４を備える。複数のハブボルト１４は、車軸１２の回転方向に互いに間隔を開けて配置されている。 As shown in FIG. 3, one hub 13 is provided at each end of the axle 12 . The hub 13 can rotate integrally with the axle 12 . The hub 13 has a plurality of hub bolts 14 . The plurality of hub bolts 14 are spaced apart from each other in the rotational direction of the axle 12 .
　ホイール１５は、ホイール１５を貫通したハブボルト１４にホイール固定部材１６が締結されることで車軸１２に固定されている。ホイール１５は、ハブ１３を介して車軸１２に固定されている。一例として、各車軸１２の両端に１つずつホイール１５を設けている場合について説明を行うが、複数の車軸１２のうち少なくとも１つの車軸１２の両端の各々に複数のホイール１５が設けられていてもよい。即ち、車軸１２の両端の各々に、シングルタイヤ用の１つのホイールが設けられてもよいし、ダブルタイヤ用の２つのホイールが設けられてもよい。 The wheel 15 is fixed to the axle 12 by fastening a wheel fixing member 16 to the hub bolt 14 passing through the wheel 15 . Wheel 15 is fixed to axle 12 via hub 13 . As an example, a case where one wheel 15 is provided on each end of each axle 12 will be described. good too. That is, each end of the axle 12 may be provided with one wheel for a single tire, or two wheels for a double tire.
　ホイール固定部材１６は、ホイールナットである。ホイール固定部材１６は、ハブ１３に締結される。本実施形態では、ハブ１３の備えるハブボルト１４に締結されるホイールナットがホイール固定部材１６である。 The wheel fixing member 16 is a wheel nut. A wheel fixing member 16 is fastened to the hub 13 . In this embodiment, the wheel fixing member 16 is a wheel nut fastened to the hub bolt 14 provided on the hub 13 .
　送信機２１は、ホイール固定部材１６と一体に設けられている。送信機２１は、任意の手法でホイール固定部材１６に取り付けることができる。例えば、送信機２１は、接着材によってホイール固定部材１６に取り付けられていてもよいし、ホイール固定部材１６に嵌め込まれることでホイール固定部材１６に取り付けられていてもよい。 The transmitter 21 is provided integrally with the wheel fixing member 16. Transmitter 21 may be attached to wheel fixture 16 in any manner. For example, the transmitter 21 may be attached to the wheel fixing member 16 with an adhesive, or may be attached to the wheel fixing member 16 by being fitted into the wheel fixing member 16 .
　図４に示すように、送信機２１は、送信機用制御装置２２と、送信回路２５と、送信アンテナ２６と、バッテリ２７と、を備える。 As shown in FIG. 4, the transmitter 21 includes a transmitter control device 22, a transmission circuit 25, a transmission antenna 26, and a battery 27.
　送信機用制御装置２２は、プロセッサ２３と、送信機用記憶部２４と、を備える。プロセッサ２３としては、例えば、MPU(Micro Processing Unit)、CPU(Central Processing Unit)、及びDSP(Digital Signal Processor)を挙げることができる。送信機用記憶部２４は、RAM（Random Access Memory）及びROM（Read Only Memory）を含む。送信機用記憶部２４は、処理をプロセッサ２３に実行させるように構成されたプログラムコード又は指令を格納している。送信機用制御装置２２は、ASICやFPGA等のハードウェア回路によって構成されていてもよい。処理回路である送信機用制御装置２２は、コンピュータプログラムに従って動作する１つ以上のプロセッサ、ASICやFPGA等の１つ以上のハードウェア回路、或いは、それらの組み合わせを含み得る。ROM及びRAMすなわちコンピュータ可読媒体は、汎用または専用のコンピュータでアクセスできるあらゆる利用可能な媒体を含む。送信機用記憶部２４は、対応する送信機２１の固有の識別情報を示すＩＤコードを記憶している。 The transmitter control device 22 includes a processor 23 and a transmitter storage section 24 . Examples of the processor 23 include an MPU (Micro Processing Unit), a CPU (Central Processing Unit), and a DSP (Digital Signal Processor). The transmitter storage unit 24 includes RAM (Random Access Memory) and ROM (Read Only Memory). Transmitter storage 24 stores program code or instructions configured to cause processor 23 to perform processing. The transmitter control device 22 may be configured by a hardware circuit such as ASIC or FPGA. The processing circuitry, transmitter controller 22, may include one or more processors operating according to a computer program, one or more hardware circuits such as ASICs or FPGAs, or a combination thereof. ROM and RAM or computer-readable media include any available media that can be accessed by a general purpose or special purpose computer. The transmitter storage unit 24 stores an ID code indicating unique identification information of the corresponding transmitter 21 .
　送信機用制御装置２２は、データを生成する。データは、デジタルデータであり２進数のデータである。本実施形態において、データは、ＩＤコードを示すデータである。送信機用制御装置２２は、データを送信回路２５に入力する。 The transmitter control device 22 generates data. The data is digital data and binary data. In this embodiment, the data is data indicating an ID code. The transmitter controller 22 inputs data to the transmitter circuit 25 .
　送信回路２５は、送信機用制御装置２２から入力されたデータに応じた変調を行った無線信号を送信アンテナ２６から送信する。これにより、送信回路２５からＩＤコードを含む無線信号が送信される。無線信号は、所定の周波数帯の信号である。周波数帯としては、例えば、ＬＦ帯、ＭＦ帯、ＨＦ帯、ＶＨＦ帯、ＵＨＦ帯、及び２．４ＧＨｚ帯を挙げることができる。送信機用制御装置２２は、所定の送信間隔で送信回路２５から無線信号を送信させるように構成されている。所定の送信間隔は、予め定められた一定の間隔であってもよいし、予め定められた上限と下限との間でランダムに変動する間隔であってもよい。 The transmission circuit 25 transmits from the transmission antenna 26 a radio signal that has been modulated according to the data input from the transmitter control device 22 . As a result, a radio signal including the ID code is transmitted from the transmission circuit 25 . A radio signal is a signal in a predetermined frequency band. Examples of frequency bands include the LF band, MF band, HF band, VHF band, UHF band, and 2.4 GHz band. The transmitter controller 22 is configured to cause the transmitter circuit 25 to transmit radio signals at predetermined transmission intervals. The predetermined transmission interval may be a predetermined constant interval, or may be an interval that randomly fluctuates between a predetermined upper limit and lower limit.
　バッテリ２７は、送信機２１の電力源である。バッテリ２７は、一次電池であってもよいし、二次電池であってもよい。バッテリ２７からの電力の供給によって送信機２１は無線信号を送信する。 The battery 27 is the power source for the transmitter 21 . The battery 27 may be a primary battery or a secondary battery. The transmitter 21 transmits radio signals by being supplied with power from the battery 27 .
　受信機３１は、受信機用制御装置３２と、受信アンテナ３５と、受信回路３６と、通信装置３７と、を備える。受信機３１は、車両１１に搭載されている。 The receiver 31 includes a receiver control device 32 , a receiving antenna 35 , a receiving circuit 36 and a communication device 37 . Receiver 31 is mounted on vehicle 11 .
　受信機用制御装置３２は、プロセッサ３３と、記憶部３４と、を備える。プロセッサ３３としては、例えば、MPU、CPU、及びDSPを挙げることができる。記憶部３４は、ROM及びRAMを含む。記憶部３４は、処理をプロセッサ３３に実行させるように構成されたプログラムコード又は指令を格納している。受信機用制御装置３２は、ASICやFPGA等のハードウェア回路によって構成されていてもよい。処理回路である受信機用制御装置３２は、コンピュータプログラムに従って動作する１つ以上のプロセッサ、ASICやFPGA等の１つ以上のハードウェア回路、或いは、それらの組み合わせを含み得る。ROM及びRAMすなわちコンピュータ可読媒体は、汎用または専用のコンピュータでアクセスできるあらゆる利用可能な媒体を含む。 The receiver control device 32 includes a processor 33 and a storage section 34. The processor 33 can include, for example, an MPU, CPU, and DSP. The storage unit 34 includes ROM and RAM. Storage unit 34 stores program code or instructions configured to cause processor 33 to perform processing. The receiver control device 32 may be configured by a hardware circuit such as ASIC or FPGA. The processing circuitry, receiver controller 32, may include one or more processors operating according to a computer program, one or more hardware circuits such as ASICs or FPGAs, or a combination thereof. ROM and RAM or computer-readable media include any available media that can be accessed by a general purpose or special purpose computer.
　記憶部３４には、全ての送信機２１のＩＤコードが記憶されている。記憶部３４に記憶されたＩＤコードには、ホイール固定部材１６の位置が対応付けられていてもよい。即ち、無線信号を送信した送信機２１の位置を受信機用制御装置３２が認識できるようにＩＤコードが記憶されていてもよい。ホイール固定部材１６の位置とは、ホイール固定部材１６が設けられたホイール１５の位置である。例えば、車両１１の右前に設けられたホイール１５を固定するためのホイール固定部材１６であれば、当該ホイール固定部材１６に設けられた送信機２１のＩＤコードに車両１１の右前が対応付けられる。 The ID codes of all the transmitters 21 are stored in the storage unit 34. The ID code stored in the storage unit 34 may be associated with the position of the wheel fixing member 16 . That is, the ID code may be stored so that the receiver control device 32 can recognize the position of the transmitter 21 that transmitted the radio signal. The position of the wheel fixing member 16 is the position of the wheel 15 on which the wheel fixing member 16 is provided. For example, in the case of the wheel fixing member 16 for fixing the wheel 15 provided on the front right of the vehicle 11, the ID code of the transmitter 21 provided on the wheel fixing member 16 is associated with the front right of the vehicle 11.
　受信アンテナ３５は、各送信機２１から送信された無線信号を受信する。受信回路３６は、受信アンテナ３５を介して受信された無線信号を復調して、データを得る。受信回路３６は、データを受信機用制御装置３２に出力する。これにより、受信機用制御装置３２は、ＩＤコードを取得する。 The receiving antenna 35 receives the radio signal transmitted from each transmitter 21 . The receiving circuit 36 demodulates the radio signal received via the receiving antenna 35 to obtain data. The receiving circuit 36 outputs data to the receiver controller 32 . As a result, the receiver control device 32 acquires the ID code.
　受信機用制御装置３２は、通知装置１７に指令を与える。通知装置１７は、指令に応じて通知を行う。通知装置１７は、ホイール固定部材１６が脱落したことを車両１１の搭乗者に通知するための装置である。通知装置１７としては、音によって通知を行う装置、ランプの点灯によって通知を行う装置、文字やマークの表示によって通知を行う装置など、どのような装置であってもよい。 The receiver control device 32 gives a command to the notification device 17. The notification device 17 notifies according to the command. The notification device 17 is a device for notifying passengers of the vehicle 11 that the wheel fixing member 16 has fallen off. The notification device 17 may be any device, such as a device that notifies by sound, a device that notifies by lighting a lamp, or a device that notifies by displaying characters or marks.
　通信装置３７は、通信制御部やポート等を備え、通信網ＮＷを通じて情報の送受信を行うことができるネットワーク機器である。通信装置３７は、通信網ＮＷを介してサーバー５１に接続されている。 The communication device 37 is a network device that includes a communication control unit, ports, etc., and can transmit and receive information through the communication network NW. The communication device 37 is connected to the server 51 via the communication network NW.
　道路用受信機４１は、道路用受信機用制御装置４２と、道路用受信アンテナ４５と、道路用受信回路４６と、道路用通信装置４７と、を備える。道路用受信機４１は、車両１１の走行する道路に沿って所定の間隔で複数設けられている。 The road receiver 41 includes a road receiver control device 42 , a road receiving antenna 45 , a road receiving circuit 46 and a road communication device 47 . A plurality of road receivers 41 are provided at predetermined intervals along the road on which the vehicle 11 travels.
　道路用受信機用制御装置４２は、プロセッサ４３と、記憶部４４と、を備える。プロセッサ４３としては、例えば、MPU、CPU、及びDSPを挙げることができる。記憶部４４は、ROM及びRAMを含む。記憶部４４は、処理をプロセッサ４３に実行させるように構成されたプログラムコード又は指令を格納している。道路用受信機用制御装置４２は、ASICやFPGA等のハードウェア回路によって構成されていてもよい。処理回路である道路用受信機用制御装置４２は、コンピュータプログラムに従って動作する１つ以上のプロセッサ、ASICやFPGA等の１つ以上のハードウェア回路、或いは、それらの組み合わせを含み得る。ROM及びRAMすなわちコンピュータ可読媒体は、汎用または専用のコンピュータでアクセスできるあらゆる利用可能な媒体を含む。 The road receiver control device 42 includes a processor 43 and a storage unit 44 . The processor 43 can include, for example, an MPU, CPU, and DSP. The storage unit 44 includes ROM and RAM. Storage unit 44 stores program code or instructions configured to cause processor 43 to perform processing. The road receiver control device 42 may be configured by a hardware circuit such as ASIC or FPGA. The processing circuitry roadway receiver controller 42 may include one or more processors operating according to a computer program, one or more hardware circuits such as ASICs or FPGAs, or a combination thereof. ROM and RAM or computer-readable media include any available media that can be accessed by a general purpose or special purpose computer.
　道路用受信アンテナ４５は、各送信機２１から送信された無線信号を受信する。道路用受信回路４６は、道路用受信アンテナ４５を介して受信された無線信号を復調して、データを得る。道路用受信回路４６は、データを道路用受信機用制御装置４２に出力する。これにより、道路用受信回路４６は、ＩＤコードを取得する。 The road receiving antenna 45 receives the radio signal transmitted from each transmitter 21 . The road reception circuit 46 demodulates the radio signal received via the road reception antenna 45 to obtain data. The road receiving circuit 46 outputs the data to the road receiver control device 42 . As a result, the road receiving circuit 46 acquires the ID code.
　道路用通信装置４７は、通信制御部やポート等を備え、通信網ＮＷを通じて情報の送受信を行うことができるネットワーク機器である。道路用通信装置４７は、通信網ＮＷを介してサーバー５１に接続されている。 The road communication device 47 is a network device that includes a communication control unit, ports, etc., and can transmit and receive information through the communication network NW. The road communication device 47 is connected to the server 51 via the communication network NW.
　送信機２１、及び受信機３１は第１脱落検知処理を行う。第１脱落検知処理は、所定の周期で繰り返し行われる。 The transmitter 21 and receiver 31 perform the first omission detection process. The first omission detection process is repeatedly performed at a predetermined cycle.
　図５に示すように、ステップＳ１において、送信機用制御装置２２は、無線信号の送信を行う。 As shown in FIG. 5, in step S1, the transmitter control device 22 transmits radio signals.
　次に、ステップＳ２において、受信機用制御装置３２は、無線信号からＩＤコードを取得する。 Next, in step S2, the receiver control device 32 acquires an ID code from the radio signal.
　次に、ステップＳ３において、受信機用制御装置３２は、いずれかのホイール固定部材１６が脱落したか否かを判定する。受信機用制御装置３２は、記憶部３４に記憶されたＩＤコード毎に、無線信号からＩＤコードを取得できたか否かを判定している。周辺環境によっては、送信機２１が無線信号を送信しているにも関わらず受信機３１が無線信号を受信できない場合がある。このため、受信機用制御装置３２は、予め定められた時間以上、継続して同一のＩＤコードを取得していない場合、当該ＩＤコードを取得していないと判定する。受信機用制御装置３２は、全ての送信機２１のＩＤコードを取得できた場合には、いずれのホイール固定部材１６も脱落していないと判断する。受信機用制御装置３２は、少なくとも１つの送信機２１のＩＤコードを取得できない場合には、いずれかのホイール固定部材１６が脱落したと判定する。ＩＤコードは無線信号によって送信されるため、受信機用制御装置３２は、無線信号の有無によってホイール固定部材１６の脱落を検知しているといえる。記憶部３４にＩＤコードに対応付けてホイール１５の位置が記憶されている場合、受信機用制御装置３２は、脱落したホイール固定部材１６の位置を特定してもよい。受信機用制御装置３２は、ＩＤコードを取得できなくなった場合、当該ＩＤコードに対応付けられたホイール１５の位置に設けられたホイール固定部材１６が緩んでいると判定してもよい。例えば、取得できなくなったＩＤコードに、ホイール固定部材１６の位置として車両１１の右前が対応付けられていれば、受信機用制御装置３２は、車両１１の右前のホイール１５を固定するためのホイール固定部材１６が緩んだと判定してもよい。ステップＳ３の判定結果が肯定の場合、受信機用制御装置３２は、ステップＳ４の処理を行う。ステップＳ３の判定結果が否定の場合、受信機用制御装置３２は、第１脱落検知処理を終了する。 Next, in step S3, the receiver control device 32 determines whether any wheel fixing member 16 has fallen off. For each ID code stored in the storage unit 34, the receiver control device 32 determines whether or not the ID code has been acquired from the radio signal. Depending on the surrounding environment, the receiver 31 may not be able to receive the radio signal even though the transmitter 21 is transmitting the radio signal. Therefore, if the same ID code has not been obtained continuously for a predetermined time or longer, the receiver control device 32 determines that the ID code has not been obtained. When the ID codes of all the transmitters 21 are acquired, the receiver control device 32 determines that none of the wheel fixing members 16 has fallen off. If the receiver control device 32 cannot acquire the ID code of at least one transmitter 21, it determines that one of the wheel fixing members 16 has fallen off. Since the ID code is transmitted by a radio signal, it can be said that the receiver control device 32 detects the dropout of the wheel fixing member 16 based on the presence or absence of the radio signal. If the storage unit 34 stores the position of the wheel 15 in association with the ID code, the receiver control device 32 may identify the position of the dropped wheel fixing member 16 . When the ID code cannot be acquired, the receiver control device 32 may determine that the wheel fixing member 16 provided at the position of the wheel 15 associated with the ID code is loose. For example, if the front right of the vehicle 11 is associated with the unacquirable ID code as the position of the wheel fixing member 16, the receiver control device 32 determines the wheel for fixing the front right wheel 15 of the vehicle 11. It may be determined that the fixing member 16 has loosened. If the determination result of step S3 is affirmative, the receiver control device 32 performs the processing of step S4. If the determination result in step S3 is negative, the receiver control device 32 terminates the first omission detection process.
　ステップＳ４において、受信機用制御装置３２は、通知装置１７による通知を行う。 In step S4, the receiver control device 32 notifies the notification device 17.
　次に、ステップＳ５において、受信機用制御装置３２は、ホイール固定部材１６が脱落したことを示す情報をサーバー５１に送信する。この際、受信機用制御装置３２は、車両１１の現在位置を示す情報をサーバー５１に送信してもよい。車両１１の現在位置を示す情報は、例えば、車両１１に搭載された衛星航法装置から取得可能である。衛星航法装置は、GNSS（Global Navigation Satellite System）衛星から送信される衛星信号を用いて位置を測定するものである。 Next, in step S5, the receiver control device 32 transmits information to the server 51 indicating that the wheel fixing member 16 has fallen off. At this time, the receiver control device 32 may transmit information indicating the current position of the vehicle 11 to the server 51 . Information indicating the current position of the vehicle 11 can be obtained from, for example, a satellite navigation device mounted on the vehicle 11 . Satellite navigation devices measure positions using satellite signals transmitted from GNSS (Global Navigation Satellite System) satellites.
　道路用受信機４１は、第２脱落検知処理を行う。第２脱落検知処理は、所定の周期で繰り返し行われる。第２脱落検知処理は、脱落したホイール固定部材１６が道路に存在するか否かを判定する処理である。 The road receiver 41 performs the second omission detection process. The second omission detection process is repeatedly performed at a predetermined cycle. The second dropping detection process is a process of determining whether or not the dropped wheel fixing member 16 exists on the road.
　図６に示すように、ステップＳ１１において、道路用受信機用制御装置４２は、無線信号からＩＤコードを取得する。 As shown in FIG. 6, in step S11, the road receiver control device 42 acquires an ID code from the radio signal.
　次に、ステップＳ１２において、道路用受信機用制御装置４２は、ホイール固定部材１６が脱落しているか否か、言い換えれば道路に落ちているか否かを判定する。道路用受信機用制御装置４２は、同一の送信機２１から送信された無線信号を繰り返し連続して受信した場合にホイール固定部材１６が脱落していると判定する。詳細にいえば、予め定められた時間以上、あるいは、予め定められた回数以上、同一のＩＤコードを繰り返し取得している場合、道路用受信機用制御装置４２は、ホイール固定部材１６が脱落していると判定する。予め定められた時間としては、道路標識や信号機による車両１１の一時的な停車に要する時間よりも長い時間が設定される。予め定められた回数は、予め定められた時間と同様に設定される。ステップＳ１２の判定結果が肯定の場合、道路用受信機用制御装置４２は、ステップＳ１３の処理を行う。ステップＳ１２の判定結果が否定の場合、道路用受信機用制御装置４２は、第２脱落検知処理を終了する。 Next, in step S12, the road receiver control device 42 determines whether or not the wheel fixing member 16 has fallen off, in other words, whether or not it has fallen on the road. The road receiver control device 42 judges that the wheel fixing member 16 has fallen off when the wireless signal transmitted from the same transmitter 21 is repeatedly and continuously received. Specifically, if the same ID code is repeatedly acquired for a predetermined time or more, or a predetermined number of times, the road receiver control device 42 detects that the wheel fixing member 16 has fallen off. determined to be The predetermined time is set to be longer than the time required for the vehicle 11 to stop temporarily due to a road sign or signal. The predetermined number of times is set similarly to the predetermined time. If the determination result of step S12 is affirmative, the road receiver control device 42 performs the processing of step S13. If the determination result in step S12 is negative, the road receiver control device 42 terminates the second dropping detection process.
　ステップＳ１３において、道路用受信機用制御装置４２は、ホイール固定部材１６が脱落していることを示す情報をサーバー５１に送信する。この際、道路用受信機用制御装置４２は、道路用受信機４１の位置を示す情報をサーバー５１に送信してもよい。道路用受信機４１の位置は不変であるため、予め記憶部４４に道路用受信機４１の位置を示す情報を記憶しておき、この情報をサーバー５１に送信してもよい。また、道路用受信機用制御装置４２は、サーバー５１が道路用受信機４１の位置を導出することができる情報を、サーバー５１に送信してもよい。例えば、サーバー５１が、道路用受信機４１のＩＤコードに対応付けて位置を記憶したデータベースを備えている場合、道路用受信機用制御装置４２は道路用受信機４１のＩＤコードを送信してもよい。ステップＳ１３の処理を終えると、道路用受信機用制御装置４２は第２脱落検知処理を終了する。 In step S13, the road receiver control device 42 transmits information to the server 51 indicating that the wheel fixing member 16 has fallen off. At this time, the road receiver control device 42 may transmit information indicating the position of the road receiver 41 to the server 51 . Since the position of the road receiver 41 does not change, information indicating the position of the road receiver 41 may be stored in advance in the storage unit 44 and this information may be transmitted to the server 51 . Further, the road receiver control device 42 may transmit to the server 51 information from which the server 51 can derive the position of the road receiver 41 . For example, if the server 51 has a database that stores the position in association with the ID code of the road receiver 41, the road receiver control device 42 transmits the ID code of the road receiver 41. good too. After completing the process of step S13, the road receiver control device 42 ends the second dropping detection process.
　上記したように、サーバー５１には、受信機３１及び道路用受信機４１から、ホイール固定部材１６が脱落したことを示す情報が送信される。これにより、サーバー５１は、ホイール固定部材１６の脱落が生じたことを認識することができる。また、受信機３１から車両１１の現在位置を示す情報が送られている場合には、車両１１の現在位置をホイール固定部材１６の脱落した位置とみなすことができる。同様に、道路用受信機４１から、道路用受信機４１の位置を示す情報が送られている場合には、道路用受信機４１の位置をホイール固定部材１６の脱落した位置とみなすことができる。 As described above, information indicating that the wheel fixing member 16 has fallen off is transmitted from the receiver 31 and the road receiver 41 to the server 51 . Thereby, the server 51 can recognize that the wheel fixing member 16 has come off. Further, when information indicating the current position of the vehicle 11 is sent from the receiver 31, the current position of the vehicle 11 can be regarded as the position where the wheel fixing member 16 has fallen off. Similarly, when information indicating the position of the road receiver 41 is sent from the road receiver 41, the position of the road receiver 41 can be regarded as the position where the wheel fixing member 16 has fallen off. .
　サーバー５１は、ユーザーに対してサービスを提供する。サービスは、クラウドとして提供される。クラウドは、データを蓄積したり、サービスを提供したりするコンピュータの利用形態の１つである。サービスとしては、ホイール固定部材１６の脱落に関する情報の提供が挙げられる。図４に示すように、サーバー５１は、外部機器５２に対して、情報の送信を可能に構成されている。外部機器５２としては、通信端末、及び道路に設けられた電光掲示板を挙げることができる。通信端末は、スマートフォン、タブレット端末、及びパーソナルコンピュータを含む。電光掲示板は、車両１１の搭乗者が視認可能な位置に配置されている。サーバー５１は、ウェブブラウザ及びアプリケーションの少なくとも一方で、通信端末にホイール固定部材１６の脱落に関する情報を提供する。通信端末は、ホイール固定部材１６が脱落している位置を表示部に表示したり、ホイール固定部材１６が脱落している位置を音声で読み上げたりすることによって、ユーザーにホイール固定部材１６が脱落している位置を通知する。サーバー５１は、電光掲示板にホイール固定部材１６の脱落に関する情報を提供する。この際、サーバー５１は、ホイール固定部材１６が脱落している位置から所定範囲内の電光掲示板に対してホイール固定部材１６の脱落に関する情報を提供する。電光掲示板には、車両１１の搭乗者に対して注意を促す表示が行われる。例えば、電光掲示板には、ホイール固定部材１６が脱落しているおそれがある旨の表示が行われる。 The server 51 provides services to users. Services are provided as a cloud. A cloud is one form of computer usage that accumulates data and provides services. One of the services is the provision of information regarding the detachment of the wheel fixing member 16 . As shown in FIG. 4, the server 51 is configured to be able to transmit information to the external device 52 . Examples of the external device 52 include a communication terminal and an electronic bulletin board provided on the road. Communication terminals include smartphones, tablet terminals, and personal computers. The electronic bulletin board is arranged at a position visible to passengers of the vehicle 11 . The server 51 provides the communication terminal with information regarding the detachment of the wheel fixing member 16 through at least one of the web browser and application. The communication terminal displays the position where the wheel fixing member 16 has fallen off on the display unit, or reads out the position where the wheel fixing member 16 has fallen off, so that the user can understand that the wheel fixing member 16 has fallen off. Notifies you of your location. The server 51 provides the electronic bulletin board with information on the detachment of the wheel fixing member 16 . At this time, the server 51 provides information on the detachment of the wheel fixing member 16 to electronic bulletin boards within a predetermined range from the position where the wheel fixing member 16 is detached. On the electronic bulletin board, a display for calling attention to passengers of the vehicle 11 is performed. For example, the electronic bulletin board displays a message to the effect that the wheel fixing member 16 may be detached.
　第１実施形態の作用について説明する。 The action of the first embodiment will be described.
　ホイール固定部材１６が車両１１から脱落すると、ホイール固定部材１６とともに送信機２１も車両１１から脱落する。これにより、受信機用制御装置３２は、無線信号を受信できなくなる。送信機２１からの無線信号を受信できなくなると、当該送信機２１のＩＤコードを受信機用制御装置３２が取得できなくなる。これにより、受信機用制御装置３２は、ホイール固定部材１６が車両１１から脱落したことを検知することができる。 When the wheel fixing member 16 drops from the vehicle 11, the transmitter 21 also drops from the vehicle 11 together with the wheel fixing member 16. As a result, the receiver control device 32 cannot receive radio signals. When the radio signal from the transmitter 21 cannot be received, the receiver control device 32 cannot acquire the ID code of the transmitter 21 . Thereby, the receiver control device 32 can detect that the wheel fixing member 16 has fallen off the vehicle 11 .
　ホイール固定部材１６が車両１１から脱落すると、ホイール固定部材１６は車両１１とともに移動することなく、道路上の一定位置に留まりやすくなる。このため、ホイール固定部材１６が脱落した場合、当該ホイール固定部材１６に設けられた送信機２１から送信される無線信号は、同一の道路用受信機４１に継続して受信されやすい。車両１１が道路用受信機４１の近くを通過したり、車両１１が道路用受信機４１の近くで一時的に停車したりした場合であっても、送信機２１からの無線信号を道路用受信機４１が受信する。しかしながら、この場合には、無線信号が一時的に受信されるだけである。このため、道路用受信機用制御装置４２は、同一のＩＤコードを繰り返し連続して受信した場合に、ホイール固定部材１６が脱落したと判定することができる。 When the wheel fixing member 16 falls off the vehicle 11, the wheel fixing member 16 does not move with the vehicle 11 and tends to remain at a fixed position on the road. Therefore, when the wheel fixing member 16 falls off, the radio signal transmitted from the transmitter 21 provided on the wheel fixing member 16 is likely to be continuously received by the same road receiver 41 . Even if the vehicle 11 passes near the road receiver 41 or the vehicle 11 temporarily stops near the road receiver 41, the radio signal from the transmitter 21 can be received for the road. machine 41 receives. However, in this case the radio signal is only temporarily received. Therefore, the road receiver control device 42 can determine that the wheel fixing member 16 has fallen off when the same ID code is repeatedly received in succession.
　第１実施形態の効果について説明する。 The effect of the first embodiment will be explained.
　（１－１）ホイール固定部材脱落検知システム２０は、送信機２１と、受信機３１と、を備える。送信機２１は、ホイール固定部材１６と一体に設けられている。このため、ホイール固定部材１６が車両１１から脱落した場合には、ホイール固定部材１６とともに送信機２１も車両１１から脱落する。送信機２１の脱落によって、受信機用制御装置３２は脱落した送信機２１のＩＤコードを取得できなくなる。このため、受信機用制御装置３２は、ＩＤコードを取得しなくなった場合にホイール固定部材１６が脱落したと判定することができる。 (1-1) The wheel fixing member detachment detection system 20 includes a transmitter 21 and a receiver 31. The transmitter 21 is provided integrally with the wheel fixing member 16 . Therefore, when the wheel fixing member 16 drops from the vehicle 11 , the transmitter 21 also drops from the vehicle 11 together with the wheel fixing member 16 . Due to the dropout of the transmitter 21 , the receiver control device 32 cannot obtain the ID code of the dropped transmitter 21 . Therefore, the receiver control device 32 can determine that the wheel fixing member 16 has fallen off when the ID code is no longer acquired.
　（１－２）送信機２１は、バッテリ２７を備える。送信機２１は、バッテリ２７の電力によって無線信号を送信可能である。 (1-2) The transmitter 21 has a battery 27 . The transmitter 21 is capable of transmitting radio signals with the power of the battery 27 .
　（１－３）ホイール固定部材脱落検知システム２０は、道路用受信機４１を備える。道路用受信機４１は、同一のＩＤコードを繰り返し連続して受信した場合に、ホイール固定部材１６が脱落したと判定する。ホイール固定部材１６が車両１１から脱落したときに、道路用受信機４１によってホイール固定部材１６の脱落を検知することができる。 (1-3) The wheel fixing member dropping detection system 20 includes a road receiver 41 . The road receiver 41 determines that the wheel fixing member 16 has fallen off when the same ID code is repeatedly received. When the wheel fixing member 16 is dropped from the vehicle 11 , the drop of the wheel fixing member 16 can be detected by the road receiver 41 .
　（１－４）ホイール固定部材脱落検知システム２０は、サーバー５１を備える。サーバー５１は、ホイール固定部材１６の脱落に関する情報を外部機器５２に提供する。これにより、ホイール固定部材１６が脱落していることをユーザーに通知することができる。 (1-4) The wheel fixing member dropping detection system 20 includes a server 51 . The server 51 provides the external device 52 with information regarding the detachment of the wheel fixing member 16 . Thereby, the user can be notified that the wheel fixing member 16 has fallen off.
　（１－５）ホイール固定部材１６の脱落を抑制するための検査として、打音による検査、及びインジケータを目視することによる検査を行う場合がある。これらの検査は、車両１１の停止中にしか行うことができない。これに対し、ホイール固定部材脱落検知システム２０を用いることで、受信機３１は、車両１１の走行中であっても、ホイール固定部材１６の脱落を検知することができる。 (1-5) As an inspection for suppressing the detachment of the wheel fixing member 16, an inspection using a hammering sound and an inspection using an indicator may be performed. These inspections can only be performed while the vehicle 11 is stopped. On the other hand, by using the wheel fixing member dropping detection system 20, the receiver 31 can detect the dropping of the wheel fixing member 16 even while the vehicle 11 is running.
　（１－６）受信機用制御装置３２は、ＩＤコードからホイール固定部材１６の脱落を検知している。ホイール固定部材１６の脱落を検知するためのセンサを送信機２１が備えていなくても、受信機用制御装置３２はホイール固定部材１６の脱落を検知することができる。従って、ホイール固定部材１６の脱落を検知するためのセンサを送信機２１が備えている場合に比べて、送信機２１の製造コストを低減させることができる。 (1-6) The receiver control device 32 detects the detachment of the wheel fixing member 16 from the ID code. Even if the transmitter 21 does not have a sensor for detecting the detachment of the wheel fixing member 16, the receiver control device 32 can detect the detachment of the wheel fixing member 16. FIG. Therefore, the manufacturing cost of the transmitter 21 can be reduced compared to the case where the transmitter 21 includes a sensor for detecting the detachment of the wheel fixing member 16 .
　（第２実施形態）
　ホイール固定部材脱落検知システムの第２実施形態について説明する。 (Second embodiment)
A second embodiment of the wheel fixing member dropping detection system will be described.
　図７に示すように、ホイール固定部材脱落検知システム２０は、中継ユニット６０を備える。中継ユニット６０は、ホイール１５毎に１つずつ設けられている。中継ユニット６０は、読取装置６１と、発電装置７１と、を備える。読取装置６１は、RFID(Radio Frequency Identification)タグに用いられるリーダライタである。 As shown in FIG. 7 , the wheel fixing member dropping detection system 20 includes a relay unit 60 . One relay unit 60 is provided for each wheel 15 . The relay unit 60 includes a reader 61 and a power generator 71 . The reader 61 is a reader/writer used for RFID (Radio Frequency Identification) tags.
　読取装置６１は、読取装置用制御装置６２と、読取装置用送受信アンテナ６５と、読取装置用送受信回路６６と、読取装置用送信回路６７と、読取装置用送信アンテナ６８と、を備える。 The reader 61 includes a reader controller 62 , a reader transmission/reception antenna 65 , a reader transmission/reception circuit 66 , a reader transmission circuit 67 , and a reader transmission antenna 68 .
　読取装置用制御装置６２は、プロセッサ６３と、記憶部６４と、を備える。プロセッサ６３としては、例えば、MPU、CPU、及びDSPを挙げることができる。記憶部６４は、ROM及びRAMを含む。記憶部６４は、処理をプロセッサ６３に実行させるように構成されたプログラムコード又は指令を格納している。読取装置用制御装置６２は、ASICやFPGA等のハードウェア回路によって構成されていてもよい。処理回路である受信機用制御装置３２は、コンピュータプログラムに従って動作する１つ以上のプロセッサ、ASICやFPGA等の１つ以上のハードウェア回路、或いは、それらの組み合わせを含み得る。ROM及びRAMすなわちコンピュータ可読媒体は、汎用または専用のコンピュータでアクセスできるあらゆる利用可能な媒体を含む。 The reader controller 62 includes a processor 63 and a storage unit 64 . The processor 63 can include, for example, an MPU, CPU, and DSP. The storage unit 64 includes ROM and RAM. Storage unit 64 stores program code or instructions configured to cause processor 63 to perform processing. The reader controller 62 may be configured by a hardware circuit such as ASIC or FPGA. The processing circuitry, receiver controller 32, may include one or more processors operating according to a computer program, one or more hardware circuits such as ASICs or FPGAs, or a combination thereof. ROM and RAM or computer-readable media include any available media that can be accessed by a general purpose or special purpose computer.
　読取装置用送受信アンテナ６５は、送信機８１に無線信号を送信する。読取装置用送受信アンテナ６５は、送信機８１から送信された無線信号を受信する。 The reading device transmitting/receiving antenna 65 transmits a radio signal to the transmitter 81 . The reader transmitting/receiving antenna 65 receives the radio signal transmitted from the transmitter 81 .
　読取装置用送受信回路６６は、読取装置用制御装置６２から入力されたデータに応じた変調を行った無線信号を読取装置用送受信アンテナ６５から送信可能である。読取装置用送受信回路６６は、読取装置用送受信アンテナ６５を介して受信された無線信号を復調して、データを得ることが可能である。読取装置用送受信回路６６は、無線信号の復調により得られたデータを読取装置用制御装置６２に出力する。 The reader transmitting/receiving circuit 66 is capable of transmitting, from the reader transmitting/receiving antenna 65, a radio signal that has been modulated according to the data input from the reader control device 62. The reader transmission/reception circuit 66 can obtain data by demodulating the radio signal received via the reader transmission/reception antenna 65 . The reader transmission/reception circuit 66 outputs the data obtained by demodulating the radio signal to the reader controller 62 .
　読取装置用送信回路６７は、読取装置用制御装置６２から入力されたデータに応じた変調を行った無線信号を読取装置用送信アンテナ６８から送信する。読取装置用送信回路６７から送信される無線信号は、受信機３１に送信される。 The reader transmission circuit 67 transmits from the reader transmission antenna 68 a radio signal that has been modulated according to the data input from the reader control device 62 . A radio signal transmitted from the reader transmission circuit 67 is transmitted to the receiver 31 .
　発電装置７１は、ホイール１５の回転、及びホイール１５の振動の少なくとも一方によって発電を行う。発電装置７１としては、例えば、圧電素子を用いたものを挙げることができる。読取装置６１は、発電装置７１の発電により得られた電力によって動作する。中継ユニット６０は、発電装置７１の発電した電力を蓄える蓄電装置を備えていてもよい。この場合、発電装置７１の発電した電力のうち読取装置６１で消費されなかった余剰の電力が蓄電装置に蓄えられる。これにより、発電装置７１が発電を行っていない場合であっても、蓄電装置からの電力によって読取装置６１を動作させることができる。蓄電装置としては、例えば、二次電池及びキャパシタを挙げることができる。 The power generation device 71 generates power by at least one of the rotation of the wheel 15 and the vibration of the wheel 15 . As the power generation device 71, for example, a device using a piezoelectric element can be used. The reading device 61 operates with electric power generated by the power generation device 71 . The relay unit 60 may include a power storage device that stores power generated by the power generation device 71 . In this case, surplus power not consumed by the reading device 61 out of the power generated by the power generation device 71 is stored in the power storage device. As a result, even when the power generation device 71 does not generate power, the reading device 61 can be operated with power from the power storage device. Examples of power storage devices include secondary batteries and capacitors.
　図８に示すように、中継ユニット６０は、例えば、ホイール１５に設けられる。中継ユニット６０は、当該中継ユニット６０が設けられているホイール１５と同一のホイール１５に設けられた送信機８１からの無線信号を読取装置６１が受信できるように設けられる。中継ユニット６０は、当該中継ユニット６０が設けられているホイール１５とは異なるホイール１５に設けられた無線信号を読取装置６１が受信できないように設けられる。例えば、車両１１の右前に設けられたホイール１５に設けられた中継ユニット６０であれば、右前のホイール１５に設けられた送信機８１からの無線信号のみを読取装置６１が受信できるように設けられている。中継ユニット６０は、ハブ１３に設けられていてもよい。 As shown in FIG. 8, the relay unit 60 is provided on the wheel 15, for example. The relay unit 60 is provided so that the reading device 61 can receive a radio signal from a transmitter 81 provided on the same wheel 15 as the wheel 15 on which the relay unit 60 is provided. The relay unit 60 is provided so that the reading device 61 cannot receive a wireless signal provided on a wheel 15 different from the wheel 15 on which the relay unit 60 is provided. For example, if the relay unit 60 is provided on the wheel 15 provided on the right front of the vehicle 11, the reading device 61 is provided so that it can receive only the radio signal from the transmitter 81 provided on the right front wheel 15. ing. The relay unit 60 may be provided on the hub 13 .
　本実施形態の送信機８１は、パッシブ方式のRFIDタグである。パッシブ方式のRFIDタグは、バッテリを備えておらず、読取装置６１から送信された電波である無線信号をエネルギー源として動作する。送信機８１は、送信機用制御装置８２と、送信機用送受信回路８５と、送信機用送受信アンテナ８６と、を備える。 The transmitter 81 of this embodiment is a passive RFID tag. A passive RFID tag does not have a battery and operates using radio signals, which are radio waves transmitted from the reader 61, as an energy source. The transmitter 81 includes a transmitter control device 82 , a transmitter transmission/reception circuit 85 , and a transmitter transmission/reception antenna 86 .
　送信機用送受信回路８５は、送信機用制御装置８２から入力されたデータに応じた変調を行った無線信号を送信機用送受信アンテナ８６から送信可能である。送信機用送受信回路８５は、送信機用送受信アンテナ８６を介して受信された無線信号を復調して、データを得ることが可能である。送信機用送受信回路８５は、無線信号の復調により得られたデータを送信機用制御装置８２に出力する。 The transmitter transmitting/receiving circuit 85 is capable of transmitting, from the transmitter transmitting/receiving antenna 86, a radio signal that has been modulated according to the data input from the transmitter control device 82. The transmitter transmission/reception circuit 85 can obtain data by demodulating the radio signal received via the transmitter transmission/reception antenna 86 . The transmitter transmitting/receiving circuit 85 outputs data obtained by demodulating the radio signal to the transmitter control device 82 .
　送信機用制御装置８２のハードウェア構成は、例えば、第１実施形態の送信機用制御装置２２と同一である。送信機用制御装置８２は、プロセッサ８３と、記憶部８４と、を備える。送信機用制御装置８２は、読取装置６１からの無線信号を受信した場合には、送信機用送受信回路８５から無線信号を送信する。この無線信号には、記憶部８４に記憶されたＩＤコードが含まれる。即ち、送信機８１は、読取装置６１からの要求に応じてＩＤコードの返送を行う。 The hardware configuration of the transmitter control device 82 is, for example, the same as the transmitter control device 22 of the first embodiment. The transmitter control device 82 includes a processor 83 and a storage section 84 . When receiving the radio signal from the reader 61 , the transmitter control device 82 transmits the radio signal from the transmitting/receiving circuit 85 for the transmitter. This radio signal contains the ID code stored in the storage unit 84 . That is, the transmitter 81 returns the ID code in response to the request from the reader 61 .
　読取装置６１で行われる中継処理について説明する。中継処理は、送信機８１のＩＤコードを中継して、受信機３１に送信する処理である。 The relay processing performed by the reading device 61 will be described. The relay process is a process of relaying the ID code of the transmitter 81 and transmitting it to the receiver 31 .
　図９に示すように、ステップＳ２１において、読取装置用制御装置６２は、読取装置用送受信回路６６から無線信号を送信する。無線信号は、送信機８１に対してＩＤコードの返送を要求する信号である。また、この無線信号は、送信機８１を動作させるためのエネルギー源となる電波である。 As shown in FIG. 9, in step S21, the reader controller 62 transmits a radio signal from the reader transmitter/receiver circuit 66. As shown in FIG. The radio signal is a signal requesting the transmitter 81 to return the ID code. Also, this radio signal is a radio wave that serves as an energy source for operating the transmitter 81 .
　次に、ステップＳ２２において、読取装置用制御装置６２は、受信した無線信号からＩＤコードを取得する。ステップＳ２１で無線信号を送信することで、送信機８１からはＩＤコードを含む無線信号が送信される。この無線信号の復調により得られたＩＤコードを読取装置用制御装置６２は取得する。 Next, in step S22, the reader controller 62 acquires an ID code from the received wireless signal. By transmitting the radio signal in step S21, the transmitter 81 transmits the radio signal including the ID code. The reader controller 62 acquires the ID code obtained by demodulating the radio signal.
　次に、ステップＳ２３において、読取装置用制御装置６２は、ホイール固定部材１６と同数のＩＤコードを取得したか否かを判定する。６つのホイール固定部材１６でホイール１５が固定されている場合、読取装置用制御装置６２は、６つのＩＤコードを取得したか否かを判定する。なお、ここでいうホイール固定部材１６の数は、ホイール固定部材１６が脱落していない場合のホイール固定部材１６の数である。言い換えれば、１つのホイール１５を固定するホイール固定部材１６の最大数である。読取装置用制御装置６２からの無線信号に応じて、各ホイール固定部材１６に設けられた送信機８１は、無線信号を送信している。このため、ホイール固定部材１６が車両１１から脱落していない場合、読取装置用制御装置６２は、ホイール固定部材１６と同数のＩＤコードを取得する。ステップＳ２３の判定結果が肯定の場合、読取装置用制御装置６２は、ステップＳ２５の処理を行う。ステップＳ２３の判定結果が否定の場合、読取装置用制御装置６２は、ステップＳ２４の処理を行う。 Next, in step S23, the reader control device 62 determines whether or not the same number of ID codes as the wheel fixing members 16 have been acquired. When the wheel 15 is fixed by the six wheel fixing members 16, the reader control device 62 determines whether or not six ID codes have been acquired. The number of wheel fixing members 16 referred to here is the number of wheel fixing members 16 when the wheel fixing members 16 are not dropped. In other words, it is the maximum number of wheel fixing members 16 that fix one wheel 15 . A transmitter 81 provided in each wheel fixing member 16 transmits a radio signal in response to a radio signal from the reader controller 62 . Therefore, when the wheel fixing member 16 has not fallen off the vehicle 11 , the reader control device 62 obtains the same number of ID codes as the wheel fixing members 16 . If the determination result of step S23 is affirmative, the reader control device 62 performs the process of step S25. If the determination result of step S23 is negative, the reader controller 62 performs the process of step S24.
　ステップＳ２４において、読取装置用制御装置６２は、所定時間が経過したか否かを判定する。所定時間は、第２脱落検知処理を開始してからの経過時間である。第２脱落検知処理を終えると、経過時間はリセットされる。所定時間としては、例えば、周辺環境などによって無線信号を受信できなくなることを考慮した上で、全ての送信機８１からの無線信号を受信可能な時間に設定される。ステップＳ２４の判定結果が否定の場合、読取装置用制御装置６２は、ステップＳ２３の処理を行う。ステップＳ２４の処理が肯定の場合、読取装置用制御装置６２は、ステップＳ２５の処理を行う。 In step S24, the reader control device 62 determines whether or not a predetermined time has passed. The predetermined time is the elapsed time from the start of the second omission detection process. When the second omission detection process ends, the elapsed time is reset. The predetermined time is set to a time during which radio signals from all the transmitters 81 can be received, taking into consideration that radio signals cannot be received due to, for example, the surrounding environment. If the determination result of step S24 is negative, the reader controller 62 performs the process of step S23. When the process of step S24 is affirmative, the reader controller 62 performs the process of step S25.
　ステップＳ２５において、読取装置用制御装置６２は、読取装置用送信回路６７から無線信号を送信する。この無線信号は、ステップＳ２３で取得したＩＤコードに応じて生成された無線信号である。即ち、無線信号は、ステップＳ２３で取得した複数の送信機８１のＩＤコードを含む。ステップＳ２３で同一のホイール１５に設けられた全ての送信機８１のＩＤコードを取得できていると判定された場合、同一のホイール１５に設けられた全ての送信機８１のＩＤコードを含んだ無線信号が送信される。ステップＳ２４で肯定判定されることでステップＳ２５の処理が行われる場合、同一のホイール１５に設けられた全ての送信機８１のＩＤコードを取得できていない。この場合、読取装置用制御装置６２は、取得できたＩＤコードを含む無線信号を送信する。また、ステップＳ２５で送信される無線信号には、同一のホイール１５に設けられるホイール固定部材１６の最大数を示す情報が含まれる。ステップＳ２５で送信される無線信号は、受信機３１に送信される。読取装置用制御装置６２は、送信機８１からの無線信号を受信して、当該無線信号に含まれるＩＤコードを受信機３１に送信するように構成されたリピータである。ステップＳ２５で受信機３１に向けて送信される無線信号は、中継信号である。 In step S25, the reader controller 62 transmits a radio signal from the reader transmitter circuit 67. This radio signal is a radio signal generated according to the ID code acquired in step S23. That is, the radio signal includes the ID codes of the plurality of transmitters 81 acquired in step S23. If it is determined in step S23 that the ID codes of all the transmitters 81 provided on the same wheel 15 have been obtained, the radio transmission including the ID codes of all the transmitters 81 provided on the same wheel 15 is performed. A signal is sent. When the process of step S25 is performed by making an affirmative determination in step S24, the ID codes of all the transmitters 81 provided on the same wheel 15 have not been acquired. In this case, the reader controller 62 transmits a radio signal containing the obtained ID code. Also, the radio signal transmitted in step S25 includes information indicating the maximum number of wheel fixing members 16 provided on the same wheel 15 . The radio signal transmitted in step S25 is transmitted to the receiver 31. FIG. The reader controller 62 is a repeater configured to receive the radio signal from the transmitter 81 and transmit the ID code included in the radio signal to the receiver 31 . The radio signal transmitted toward the receiver 31 in step S25 is a relay signal.
　受信機３１は、読取装置６１から送信された無線信号を受信すると、第１実施形態と同様の第１脱落検知処理を行うことでホイール固定部材１６が脱落したか否かを判定する。即ち、受信機３１は、ＩＤコードを取得できたか否かによってホイール固定部材１６が脱落したか否かを判定する。 Upon receiving the radio signal transmitted from the reading device 61, the receiver 31 determines whether or not the wheel fixing member 16 has fallen off by performing the first drop detection process similar to that of the first embodiment. That is, the receiver 31 determines whether or not the wheel fixing member 16 has fallen off based on whether or not the ID code has been acquired.
　第２実施形態の道路用受信機４１で行われる第２脱落検知処理について説明する。 The second dropping detection process performed by the road receiver 41 of the second embodiment will be described.
　図１０に示すように、ステップＳ３１において、道路用受信機用制御装置４２は、道路を走行している或いは道路上で一時停止している車両１１の中継ユニット６０から、ＩＤコードを取得する。このＩＤコードは、ステップＳ２５で中継ユニット６０から送信される無線信号、即ち、中継信号の復調により得られるものである。また、道路用受信機用制御装置４２は、同一のホイール１５に設けられるホイール固定部材１６の最大数を示す情報を、同じく中継ユニット６０が送信する無線信号から取得する。 As shown in FIG. 10, in step S31, the road receiver control device 42 acquires an ID code from the relay unit 60 of the vehicle 11 traveling on the road or temporarily stopped on the road. This ID code is obtained by demodulating the radio signal transmitted from the relay unit 60 in step S25, that is, the relay signal. Further, the road receiver control device 42 acquires information indicating the maximum number of wheel fixing members 16 provided on the same wheel 15 from the radio signal similarly transmitted by the relay unit 60 .
　次に、ステップＳ３２において、道路用受信機用制御装置４２は、無線信号から得られたＩＤコードの数が、同一のホイール１５に設けられるホイール固定部材１６の最大数と一致するか否かを判定する。ホイール固定部材１６が車両１１から脱落した場合、ホイール固定部材１６の最大数よりもＩＤコードの数が少なくなる。このため、ＩＤコードの数がホイール固定部材１６の最大数と一致するか否かを判定することによって、ホイール固定部材１６が脱落したか否かを判定することができる。道路用受信機用制御装置４２は、ＩＤコードの数がホイール固定部材１６の最大数と一致している場合、ホイール固定部材１６は脱落していないと判定する。道路用受信機用制御装置４２は、ＩＤコードの数がホイール固定部材１６の最大数と一致していない場合、ホイール固定部材１６が脱落したと判定する。ステップＳ３２の判定結果が肯定の場合、道路用受信機用制御装置４２は、第２脱落検知処理を終了する。ステップＳ３２の判定結果が否定の場合、道路用受信機用制御装置４２は、ステップＳ３３の処理を行う。 Next, in step S32, the road receiver control device 42 determines whether or not the number of ID codes obtained from the radio signal matches the maximum number of wheel fixing members 16 provided on the same wheel 15. judge. When the wheel fixing members 16 fall off the vehicle 11, the number of ID codes becomes smaller than the maximum number of wheel fixing members 16.例文帳に追加Therefore, by determining whether or not the number of ID codes matches the maximum number of wheel fixing members 16, it is possible to determine whether or not the wheel fixing member 16 has fallen off. If the number of ID codes matches the maximum number of wheel fixing members 16, the road receiver controller 42 determines that the wheel fixing members 16 have not fallen off. If the number of ID codes does not match the maximum number of wheel fixing members 16, the road receiver controller 42 determines that the wheel fixing member 16 has fallen off. If the determination result in step S32 is affirmative, the road receiver control device 42 terminates the second dropping detection process. If the determination result of step S32 is negative, the road receiver control device 42 performs the processing of step S33.
　ステップＳ３３において、道路用受信機用制御装置４２は、ホイール固定部材１６が脱落したことを示す情報をサーバー５１に送信する。ステップＳ３３の処理は、ステップＳ１３の処理と同様である。 In step S33, the road receiver control device 42 transmits information to the server 51 indicating that the wheel fixing member 16 has fallen off. The processing of step S33 is the same as the processing of step S13.
　第２実施形態の効果について説明する。第２実施形態では、第１実施形態の効果（１－１）、及び（１－４）～（１－６）に加えて以下の効果が得られる。 The effect of the second embodiment will be explained. In the second embodiment, the following effects are obtained in addition to the effects (1-1) and (1-4) to (1-6) of the first embodiment.
　（２－１）読取装置６１は、送信機８１のＩＤコードを取得して、取得したＩＤコードを含む無線信号を受信機３１に送信している。読取装置６１は、ＩＤコードの中継を行うことができる。このため、送信機８１の通信可能距離、及び送信機８１と受信機３１との通信方式の相違などを原因として、送信機８１からの無線信号を受信機３１が直接受信できない場合であっても、受信機３１にＩＤコードを取得させることができる。 (2-1) The reading device 61 acquires the ID code of the transmitter 81 and transmits to the receiver 31 a radio signal including the acquired ID code. The reader 61 can relay the ID code. Therefore, even if the receiver 31 cannot directly receive the radio signal from the transmitter 81 due to the communicable distance of the transmitter 81, the difference in the communication method between the transmitter 81 and the receiver 31, etc. , the receiver 31 can acquire the ID code.
　（２－２）読取装置６１は、複数の送信機８１のＩＤコードを含む無線信号を受信機３１に向けて送信している。ＩＤコードを取得する度に無線信号を送信する場合に比べて、送信頻度を低減させることができる。 (2-2) The reading device 61 transmits a radio signal including the ID codes of the multiple transmitters 81 to the receiver 31 . The frequency of transmission can be reduced compared to the case where a radio signal is transmitted each time an ID code is acquired.
　（２－３）道路用受信機４１は、読取装置６１からの無線信号によってホイール固定部材１６が脱落したか否かを判定している。ホイール固定部材１６が車両１１から脱落したときに、道路用受信機４１によってホイール固定部材１６の脱落を検知することができる。 (2-3) The road receiver 41 determines whether or not the wheel fixing member 16 has fallen off based on the radio signal from the reading device 61 . When the wheel fixing member 16 is dropped from the vehicle 11 , the drop of the wheel fixing member 16 can be detected by the road receiver 41 .
　（２－４）送信機８１としてパッシブ方式のRFIDタグを用いている。このため、送信機８１がバッテリを備えていなくてもよい。送信機８１がバッテリを備えている場合に比べて、送信機８１の軽量化を図ることができる。また、バッテリの残容量を考慮する必要がないため、送信機８１を長期間に亘って使用することができる。 (2-4) A passive RFID tag is used as the transmitter 81 . Therefore, the transmitter 81 does not have to be equipped with a battery. The weight of the transmitter 81 can be reduced as compared with the case where the transmitter 81 includes a battery. Moreover, since there is no need to consider the remaining capacity of the battery, the transmitter 81 can be used for a long period of time.
　（２－５）読取装置６１は、ホイール１５の回転や振動を利用して発電を行う発電装置７１からの電力によって動作する。バッテリを用いて読取装置６１を動作させる場合に比べて、バッテリの残容量を考慮しなくてもよい。 (2-5) The reading device 61 operates with electric power from a power generation device 71 that uses the rotation and vibration of the wheel 15 to generate power. Compared to the case where the reading device 61 is operated using a battery, it is not necessary to consider the remaining capacity of the battery.
　各実施形態は、以下のように変更して実施することができる。実施形態及び以下の変形例は、技術的に矛盾しない範囲で互いに組み合わせて実施することができる。 Each embodiment can be modified and implemented as follows. The embodiments and the following modifications can be implemented in combination with each other within a technically consistent range.
　・各実施形態において、道路用受信機４１が道路用通知装置を備えていてもよい。道路用通知装置としては、音によって通知を行う装置、ランプの点灯によって通知を行う装置、文字やマークの表示によって通知を行う装置など、どのような装置であってもよい。道路用受信機用制御装置４２は、ホイール固定部材１６が脱落していると判定した場合、道路用通知装置によって通知を行ってもよい。これにより、道路用受信機４１の周囲に対して、ホイール固定部材１６が脱落しているおそれがあることを通知することができる。 · In each embodiment, the road receiver 41 may include a road notification device. The road notification device may be any device, such as a device that notifies by sound, a device that notifies by lighting a lamp, or a device that notifies by displaying characters or marks. When the road receiver controller 42 determines that the wheel fixing member 16 has fallen off, the road receiver control device 42 may make a notification through the road notification device. As a result, it is possible to notify the surroundings of the road receiver 41 that there is a possibility that the wheel fixing member 16 has fallen off.
　・各実施形態において、ホイール固定部材脱落検知システム２０は、サーバー５１を備えていなくてもよい。この場合、道路用受信機４１は、上記した道路用通知装置を備えることが好ましい。 · In each embodiment, the wheel fixing member falling-off detection system 20 may not include the server 51 . In this case, the road receiver 41 preferably includes the road notification device described above.
　・各実施形態において、ホイール固定部材脱落検知システム２０は、道路用受信機４１を備えていなくてもよい。 · In each embodiment, the wheel fixing member dropping detection system 20 does not have to include the road receiver 41 .
　・第１実施形態において、ホイール固定部材脱落検知システム２０は、リピータ９１を備えていてもよい。図１１に示すように、リピータ９１は、ホイール１５に対応して１つずつ車両１１に設けられる。リピータ９１は、送信機２１からの無線信号を受信して、当該無線信号に含まれるＩＤコードを含んだ中継信号を受信機３１に送信するように構成されている。これにより、送信機２１の通信可能距離、及び送信機２１と受信機３１との通信方式の相違などを原因として、送信機２１からの無線信号を受信機３１が直接受信できない場合であっても、受信機３１にＩＤコードを取得させることができる。 · In the first embodiment, the wheel fixing member dropping detection system 20 may include a repeater 91 . As shown in FIG. 11 , the repeaters 91 are provided on the vehicle 11 one by one corresponding to the wheels 15 . The repeater 91 is configured to receive a radio signal from the transmitter 21 and transmit a relay signal containing the ID code included in the radio signal to the receiver 31 . As a result, even if the receiver 31 cannot directly receive the radio signal from the transmitter 21 due to the communicable distance of the transmitter 21, the difference in the communication method between the transmitter 21 and the receiver 31, etc. , the receiver 31 can acquire the ID code.
　リピータ９１は、第２実施形態の読取装置６１と同様の中継処理を行ってもよい。この場合、道路用受信機４１は、第２実施形態と同様の第２脱落検知処理を行うことで、ホイール固定部材１６の脱落を検知することができる。 The repeater 91 may perform relay processing similar to that of the reading device 61 of the second embodiment. In this case, the road receiver 41 can detect the detachment of the wheel fixing member 16 by performing the second detachment detection process similar to that of the second embodiment.
　・第２実施形態において、道路用受信機４１は、道路用読取装置を備えていてもよい。道路用読取装置は、読取装置６１と同様の装置である。道路用読取装置は、定期的に無線信号を送信する。この無線信号を送信機８１が受信した場合、送信機８１はＩＤコードを含む無線信号を送信する。道路用読取装置は、同一のＩＤコードを繰り返し連続して受信した場合、即ち、同一の送信機８１から送信された無線信号を繰り返し連続して受信した場合にホイール固定部材１６が脱落したと判定する。 · In the second embodiment, the road receiver 41 may include a road reader. The road reader is a device similar to the reader 61 . A road reader periodically transmits a radio signal. When the transmitter 81 receives this radio signal, the transmitter 81 transmits a radio signal containing the ID code. The road reader determines that the wheel fixing member 16 has fallen off when the same ID code is repeatedly received, that is, when the radio signal transmitted from the same transmitter 81 is repeatedly received. do.
　・第２実施形態において、読取装置６１は、バッテリ２７によって動作するように構成されていてもよい。 · In the second embodiment, the reading device 61 may be configured to operate with the battery 27 .
　・第２実施形態において、ステップＳ２５で送信される無線信号には、同一のホイール１５に設けられるホイール固定部材１６の最大数を示す情報が含まれていなくてもよい。この場合、ステップＳ２５で送信される無線信号には、道路用受信機４１がホイール固定部材１６の最大数を間接的に認識できる情報が含まれていてもよい。例えば、ステップＳ２５で送信される無線信号には、車両識別番号、及び読取装置６１のＩＤコードが含まれていてもよい。道路用受信機４１は、車両識別番号から車両１１の車種を認識し、車種からホイール固定部材１６の最大数を認識してもよい。読取装置６１のＩＤコードからホイール固定部材１６の最大数を認識する場合、ホイール固定部材１６の最大数に応じて、読取装置６１のＩＤコードをグルーピングしておく。これにより、道路用受信機４１では、読取装置６１のＩＤコードからホイール固定部材１６の最大数を認識することができる。 · In the second embodiment, the radio signal transmitted in step S25 may not include information indicating the maximum number of wheel fixing members 16 provided on the same wheel 15 . In this case, the radio signal transmitted in step S25 may include information that allows the road receiver 41 to indirectly recognize the maximum number of wheel fixing members 16 . For example, the radio signal transmitted in step S25 may include the vehicle identification number and the ID code of the reader 61. FIG. The road receiver 41 may recognize the vehicle type of the vehicle 11 from the vehicle identification number, and may recognize the maximum number of wheel fixing members 16 from the vehicle type. When recognizing the maximum number of wheel fixing members 16 from the ID code of the reading device 61 , the ID codes of the reading device 61 are grouped according to the maximum number of wheel fixing members 16 . As a result, the road receiver 41 can recognize the maximum number of wheel fixing members 16 from the ID code of the reader 61 .
　また、ホイール固定部材１６の最大数に応じて、送信機８１のＩＤコードをグルーピングしておいてもよい。この場合、道路用受信機４１では、取得したＩＤコードからホイール固定部材１６の最大数を認識することができる。 Also, the ID codes of the transmitters 81 may be grouped according to the maximum number of wheel fixing members 16 . In this case, the road receiver 41 can recognize the maximum number of wheel fixing members 16 from the obtained ID code.
　また、ステップＳ２４が肯定になった場合、言い換えれば、ＩＤコードの欠落が生じている場合、ステップＳ２５では、欠落しているＩＤコードのデータを、送信機８１では使用しないデータにして送信してもよい。道路用受信機４１は、取得したＩＤコードに、送信機８１では使用しないＩＤコードが含まれている場合には、ホイール固定部材１６が脱落したと判定することができる。 If the result of step S24 is affirmative, in other words, if the ID code is missing, the missing ID code data is transmitted as data not used by the transmitter 81 in step S25. good too. If the acquired ID code includes an ID code that is not used by the transmitter 81, the road receiver 41 can determine that the wheel fixing member 16 has fallen off.
　・第２実施形態において、読取装置６１は、ホイール固定部材１６が脱落したか否かを判定してもよい。読取装置６１の記憶部６４に送信機８１のＩＤコードを記憶しておき、第１脱落検知処理と同様の処理を読取装置６１で行うことで、ホイール固定部材１６が脱落したか否かを判定できる。読取装置６１は、ホイール固定部材１６が脱落したと判定した場合、ホイール固定部材１６が脱落したことを示す情報を道路用受信機４１に送信してもよい。この場合、読取装置６１が受信機である。ホイール固定部材脱落検知システム２０は、受信機３１を備えていてもよいし、備えていなくてもよい。ホイール固定部材脱落検知システム２０が受信機３１を備えている場合、読取装置６１は、ホイール固定部材１６が脱落したと判定した場合、ホイール固定部材１６が脱落したことを示す情報を受信機３１に送信してもよい。ホイール固定部材脱落検知システム２０が受信機３１を備えていない場合、中継ユニット６０が通信装置３７を備えていてもよい。読取装置用制御装置６２が、ホイール固定部材１６が脱落したことを示す情報をサーバー５１に送信する。 · In the second embodiment, the reading device 61 may determine whether or not the wheel fixing member 16 has fallen off. The ID code of the transmitter 81 is stored in the storage unit 64 of the reading device 61, and the reading device 61 performs the same processing as the first removal detection processing, thereby determining whether or not the wheel fixing member 16 has fallen off. can. When the reading device 61 determines that the wheel fixing member 16 has fallen off, the reading device 61 may transmit information indicating that the wheel fixing member 16 has fallen off to the road receiver 41 . In this case, reader 61 is the receiver. The wheel fixing member detachment detection system 20 may or may not include the receiver 31 . When the wheel fixing member falling detection system 20 is provided with the receiver 31, the reading device 61 sends information indicating that the wheel fixing member 16 has fallen off to the receiver 31 when determining that the wheel fixing member 16 has fallen off. You may send. If the wheel fixing member drop-off detection system 20 does not include the receiver 31 , the relay unit 60 may include the communication device 37 . The reader controller 62 transmits information to the server 51 indicating that the wheel fixing member 16 has fallen off.
　・第２実施形態において、読取装置６１は、ホイール１５毎に設けられていなくてもよい。例えば、ホイール固定部材脱落検知システム２０は、１つの読取装置６１を備えていてもよい。この場合、１つの読取装置６１が、各ホイール１５に設けられた送信機８１のＩＤコードを取得し、受信機３１に送信する。 · In the second embodiment, the reader 61 may not be provided for each wheel 15 . For example, the wheel fixing member drop-off detection system 20 may include one reader 61 . In this case, one reader 61 acquires the ID code of the transmitter 81 provided on each wheel 15 and transmits it to the receiver 31 .
　・第２実施形態において、読取装置用制御装置６２は、ＩＤコードを取得する度に、ＩＤコードを含む無線信号を受信機３１に送信してもよい。 · In the second embodiment, the reader control device 62 may transmit a radio signal including the ID code to the receiver 31 every time it acquires the ID code.
　・各実施形態において、ホイール固定部材１６は、ホイールボルトであってもよい。ホイール固定部材１６がホイールボルトの場合、ハブ１３は、ハブボルト１４に代えてボルト孔を備える。ホイールボルトは、ボルト孔に挿入される。これにより、ホイールボルトは、ハブ１３に締結される。ホイール１５は、ホイールボルトによって車軸１２に固定される。 · In each embodiment, the wheel fixing member 16 may be a wheel bolt. If the wheel fixing member 16 is a wheel bolt, the hub 13 has a bolt hole instead of the hub bolt 14 . Wheel bolts are inserted into the bolt holes. The wheel bolt is thereby fastened to the hub 13 . A wheel 15 is fixed to the axle 12 by a wheel bolt.
　ホイールボルトは、軸部と、頭部と、を備える。軸部は、ボルト孔に挿入される。送信機２１，８１は、頭部に取り付けられる。例えば、頭部の軸線方向の両端面のうち軸部が設けられている面の反対面に、送信機２１，８１は取り付けられる。送信機２１，８１は、接着材によってホイールボルトに取り付けられていてもよいし、ホイールボルトに嵌め込まれることでホイールボルトに取り付けられていてもよい。 A wheel bolt has a shaft and a head. The shaft is inserted into the bolt hole. Transmitters 21, 81 are attached to the head. For example, the transmitters 21 and 81 are attached to the opposite surface of the axial end surface of the head, to the surface on which the shaft portion is provided. The transmitters 21 and 81 may be attached to the wheel bolts with an adhesive, or may be attached to the wheel bolts by being fitted into the wheel bolts.
　・各実施形態において、送信機２１，８１は、ホイール固定部材１６と一体に設けられていればよく、ホイール固定部材１６に取り付けられたナットキャップに取り付けられていてもよい。即ち、送信機２１，８１は、ホイール固定部材１６が車両１１から脱落した際に、ホイール固定部材１６とともに車両１１から脱落すればよい。 · In each embodiment, the transmitters 21 and 81 may be provided integrally with the wheel fixing member 16 and may be attached to a nut cap attached to the wheel fixing member 16 . That is, the transmitters 21 and 81 may drop out of the vehicle 11 together with the wheel fixing member 16 when the wheel fixing member 16 drops out of the vehicle 11 .
　１１…車両、１２…車軸、１５…ホイール、１６…ホイール固定部材、２０…ホイール固定部材脱落検知システム、２１…送信機、２２…送信機用制御装置、２４…送信機用記憶部、２５…送信回路、２７…バッテリ、３１…受信機、３２…受信機用制御装置、３７…通信装置、４１…道路用受信機、５１…サーバー、６１…読取装置、９１…リピータ。 DESCRIPTION OF SYMBOLS 11... Vehicle 12... Axle 15... Wheel 16... Wheel fixing member 20... Wheel fixing member omission detection system 21... Transmitter 22... Controller for transmitter 24... Storage unit for transmitter 25... Transmission circuit 27 Battery 31 Receiver 32 Receiver control device 37 Communication device 41 Road receiver 51 Server 61 Reader 91 Repeater.

Claims (8)

  1. 　ホイールを車軸に固定するためのホイール固定部材と一体に設けられた送信機と、
    　車両に搭載された受信機と、を備えたホイール固定部材脱落検知システムであって、
    　前記送信機は、
    　識別情報を記憶するように構成された送信機用記憶部と、
    　前記識別情報を含む無線信号を送信するように構成された送信回路と、を備え、
    　前記受信機は、前記無線信号に含まれる前記識別情報を取得するように構成された受信機用制御装置を備え、
    　前記受信機用制御装置は、前記識別情報を取得しなくなった場合に前記ホイール固定部材が脱落したと判定するように構成されている、ホイール固定部材脱落検知システム。     a transmitter integrated with a wheel fixing member for fixing the wheel to the axle;
    A receiver mounted on a vehicle, and a wheel fixing member dropout detection system comprising:
    The transmitter is
    a transmitter storage configured to store identification information;
    a transmission circuit configured to transmit a radio signal containing the identification information;
    the receiver comprises a receiver controller configured to obtain the identification information contained in the radio signal;
    The wheel fixing member dropping detection system, wherein the receiver control device is configured to determine that the wheel fixing member has dropped when the identification information is no longer acquired.
  2. 　前記ホイール固定部材脱落検知システムは、前記無線信号を受信して、当該無線信号に含まれる前記識別情報を含んだ中継信号を送信するように構成されているリピータをさらに備える、請求項１に記載のホイール固定部材脱落検知システム。 2. The wheel fixing member detachment detection system according to claim 1, further comprising a repeater configured to receive the radio signal and transmit a relay signal including the identification information included in the radio signal. of the wheel fixing member omission detection system.
  3. 　前記リピータは、複数の前記送信機の前記識別情報を含む前記中継信号を送信するように構成されている、請求項２に記載のホイール固定部材脱落検知システム。 The wheel fixing member falling-off detection system according to claim 2, wherein the repeater is configured to transmit the relay signal including the identification information of a plurality of the transmitters.
  4. 　前記送信機は、バッテリを備え、
    　前記送信機は、前記バッテリの電力によって前記無線信号を送信するように構成されている、請求項１～請求項３のうちいずれか一項に記載のホイール固定部材脱落検知システム。     the transmitter comprises a battery,
    The wheel fixing member drop-off detection system according to any one of claims 1 to 3, wherein the transmitter is configured to transmit the wireless signal by power of the battery.
  5. 　前記ホイール固定部材脱落検知システムは、道路に設けられるように構成された道路用受信機をさらに備え、
    　前記道路用受信機は、同一の前記送信機から送信された無線信号を予め定められた時間以上、あるいは、予め定められた回数以上、繰り返し受信した場合に前記ホイール固定部材が脱落したと判定するように構成されている、請求項４に記載のホイール固定部材脱落検知システム。     The wheel fixing member dropout detection system further comprises a road receiver configured to be installed on a road,
    The road receiver determines that the wheel fixing member has fallen off when the wireless signal transmitted from the same transmitter is repeatedly received for a predetermined time or more or a predetermined number of times or more. 5. The wheel fixing member falling-off detection system according to claim 4, which is configured as follows.
  6. 　前記リピータは、前記送信機に電波を送信することが可能であり、かつ、前記無線信号を受信するように構成された読取装置であり、
    　前記送信機は、前記電波から得られた電力によって前記無線信号を送信するように構成されている、請求項２又は請求項３に記載のホイール固定部材脱落検知システム。     the repeater is a reader capable of transmitting radio waves to the transmitter and configured to receive the radio signal;
    4. The wheel fixing member drop-off detection system according to claim 2 or 3, wherein the transmitter is configured to transmit the radio signal using power obtained from the radio waves.
  7. 　前記ホイール固定部材脱落検知システムは、道路に設けられるように構成された道路用受信機をさらに備え、
    　前記道路用受信機は、前記リピータから送信された前記中継信号から前記ホイール固定部材が脱落したことを判定するように構成されている、請求項２、請求項３及び請求項６のうちいずれか一項に記載のホイール固定部材脱落検知システム。      The wheel fixing member dropout detection system further comprises a road receiver configured to be installed on a road,
    7. Any one of claims 2, 3 and 6, wherein the road receiver is configured to determine from the relay signal transmitted from the repeater that the wheel fixing member has fallen off. 1. The wheel fixing member fall-off detection system according to claim 1.
  8. 　前記ホイール固定部材脱落検知システムは、
    　サーバーと、
    　前記サーバーに、前記ホイール固定部材が脱落したことを示す情報を送信する通信装置と、をさらに備える、請求項１～請求項７のうちいずれか一項に記載のホイール固定部材脱落検知システム。     The wheel fixing member dropping detection system includes:
    a server;
    The wheel fixing member falling detection system according to any one of claims 1 to 7, further comprising a communication device that transmits information indicating that the wheel fixing member has fallen off to the server.
PCT/JP2021/028405 2021-07-30 2021-07-30 Wheel-securing member falloff detection system WO2023007715A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/028405 WO2023007715A1 (en) 2021-07-30 2021-07-30 Wheel-securing member falloff detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/028405 WO2023007715A1 (en) 2021-07-30 2021-07-30 Wheel-securing member falloff detection system

Publications (1)

Publication Number Publication Date
WO2023007715A1 true WO2023007715A1 (en) 2023-02-02

Family

ID=85086478

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/028405 WO2023007715A1 (en) 2021-07-30 2021-07-30 Wheel-securing member falloff detection system

Country Status (1)

Country Link
WO (1) WO2023007715A1 (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06247114A (en) * 1993-02-22 1994-09-06 Tokai Rika Co Ltd Tire abnormality warning device of automobile with remote control device
JP2003300452A (en) * 2002-04-08 2003-10-21 Tokai Rika Co Ltd Tire monitoring device for vehicle
JP2005199803A (en) * 2004-01-14 2005-07-28 Calsonic Kansei Corp Tire antitheft system for automobile
JP2005329907A (en) * 2004-05-21 2005-12-02 Denso Corp Wheel separation detecting device
JP2008074163A (en) * 2006-09-19 2008-04-03 Denso Corp Tire air pressure detecting device
JP2010156616A (en) * 2008-12-26 2010-07-15 Mitsubishi Fuso Truck & Bus Corp Detector for detecting detached state of tire in vehicle
JP2013523519A (en) * 2010-03-30 2013-06-17 ウィーリー−セーフ リミテッド Wheel loss detection device
JP2019182330A (en) * 2018-04-16 2019-10-24 株式会社ブリヂストン Tire condition remote monitoring system, tire condition remote monitoring program and tire condition remote monitoring method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06247114A (en) * 1993-02-22 1994-09-06 Tokai Rika Co Ltd Tire abnormality warning device of automobile with remote control device
JP2003300452A (en) * 2002-04-08 2003-10-21 Tokai Rika Co Ltd Tire monitoring device for vehicle
JP2005199803A (en) * 2004-01-14 2005-07-28 Calsonic Kansei Corp Tire antitheft system for automobile
JP2005329907A (en) * 2004-05-21 2005-12-02 Denso Corp Wheel separation detecting device
JP2008074163A (en) * 2006-09-19 2008-04-03 Denso Corp Tire air pressure detecting device
JP2010156616A (en) * 2008-12-26 2010-07-15 Mitsubishi Fuso Truck & Bus Corp Detector for detecting detached state of tire in vehicle
JP2013523519A (en) * 2010-03-30 2013-06-17 ウィーリー−セーフ リミテッド Wheel loss detection device
JP2019182330A (en) * 2018-04-16 2019-10-24 株式会社ブリヂストン Tire condition remote monitoring system, tire condition remote monitoring program and tire condition remote monitoring method

Similar Documents

Publication Publication Date Title
JP5203396B2 (en) Tracking system monitoring device
JP6060665B2 (en) Tire theft alarm system
US20090231189A1 (en) Vehicle tracking and security using an ad-hoc wireless mesh and method thereof
KR101722219B1 (en) System for preventing loss of bicycle using wireless communication
WO2016113814A1 (en) In-vehicle unit
NO342828B1 (en) Device for detection of external damage to chassis of a vehicle
JP2014097745A (en) Tire condition monitoring system
US8902082B2 (en) Communicating statuses of vehicles
WO2018013047A1 (en) Method and device for monitoring statuses and positions of goods
WO2023007715A1 (en) Wheel-securing member falloff detection system
JP2008305043A (en) Distance/location confirmation system
US10924192B2 (en) Vehicular communication device
TWI589884B (en) Bluetooth personnel locating system
CN112351061A (en) Item/asset tracking
JP2017182196A (en) Approaching vehicle detection device
CN108248301A (en) Tire lifecycle management system
AU2020202950B2 (en) Wireless Tracking System for Trolleys and Electronic Boarding Pass
JP2023540878A (en) Tracking devices and systems
JP2018079792A (en) Tire air pressure monitoring device, monitoring device and detection device
US11368811B2 (en) System and method for registering a position of loss of an object
WO2020054097A1 (en) Information collection system and information collection terminal
WO2022259364A1 (en) Wireless communication system
JP4196854B2 (en) Tire identification information registration system
Bharath et al. NB-IoT based road accident alert system
KR20200005180A (en) SYSTEM AND METHOD FOR TRACKING LOGISTICS BASED ON IoT

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21951914

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE