JP2020009053A - Operation recording device - Google Patents

Abstract

To eliminate the need for mounting a large battery, reduce the need for maintenance due to replacement and charging and so on, and to secure continuous operation, when an on-vehicle device is mounted on the wheel of a vehicle.SOLUTION: An operation recording device is provided with a dynamo 30 that generates power independently to eliminate the need for power supply from a vehicle body, a secondary battery 25, and a short-range wireless communication part 32 for transmitting data wirelessly. A CPU 22 automatically controls the power consumption of a hub cap type vehicle-mounted device 20 according to the state of the vehicle. A mode is switched to a power saving mode by starting/stopping the vehicle as a trigger. After the power generation of the dynamo 30 is stabilized, the mode is switched to a normal mode. When the stop of a wheel is detected, the mode is sequentially switched to a low-consumption mode or an ultra-low-consumption mode according to the duration of a stop state to save power. The operation recording device can be mounted on the wheel without wiring, and used for a long time without maintenance.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an operation recording device that can be mounted on a wheel or the like of a vehicle.

  Conventionally, various types of operation recording devices that can be mounted on vehicles such as trucks have been developed, put into practical use, and sold.

  Also, for example, Patent Document 1 shows a vehicle drive recorder that can be mounted on a vehicle that does not have a power supply, such as a bicycle. The drive recorder disclosed in Patent Literature 1 is based on a DC converter that converts AC power supplied from an AC power generator, the magnitude of which fluctuates in accordance with the rotation of a wheel rotating by human power, into DC power, and DC power. A photographing section that is driven and generates photographing data by photographing the periphery of the vehicle. Specifically, the AC power generator is a hub dynamo (generator: alternator) mounted on a front wheel hub of a bicycle. Such a hub dynamo for a bicycle is generally fixed to the body side of the bicycle, and a rotating portion is connected to a front wheel hub to convert rotational motion into electric power.

JP 2018-10350A

  For example, if an in-vehicle device such as a digital tachograph mounted on a vehicle such as a truck can be mounted on wheels, mounting and maintenance will be easier than when mounted on a vehicle body. However, since the wheels rotate at high speed, when the vehicle-mounted device is mounted on the wheel side, it is difficult to electrically connect the vehicle-mounted device and the vehicle body. That is, it is difficult to supply power to the vehicle-mounted device from the vehicle body or to transfer data from the vehicle-mounted device to the vehicle body.

  Therefore, in such a case, it is assumed that a battery is mounted on the vehicle-mounted device itself. However, periodic maintenance is required in a short cycle to replace or charge the battery. It is also conceivable to mount a generator on the vehicle-mounted device itself. However, when the vehicle is stopped, power generation also stops, and the operation of the vehicle-mounted device stops.

  In the case of a drive recorder for a bicycle as disclosed in Patent Document 1, it is considered that there is no problem even if the operation of the drive recorder is stopped when the bicycle is stopped. However, in the case of a vehicle such as a truck, even when the vehicle is stopped, it is necessary to continue the operation record and the operation management of the vehicle to some extent. Further, for example, when a large battery is mounted on the vehicle-mounted device itself, the vehicle-mounted device becomes large and its weight increases, so that it becomes difficult to mount it on wheels.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to eliminate the need for mounting a wiring or a large battery when mounting an on-vehicle device on a vehicle wheel, and to replace or charge the battery. It is an object of the present invention to provide an operation recording device that can reduce the necessity of maintenance caused by the above and can operate continuously.

In order to achieve the above-mentioned object, an operation recording device according to the present invention is characterized by the following (1) to (5).
(1) An operation recording device configured as an on-vehicle device mounted on a wheel that rotates together with the wheel in a vehicle, or a rotating part near the wheel,
An independent power generation unit that generates electric power consumed in the on-vehicle device,
A wireless communication unit capable of transmitting data using a wireless signal,
An information recording unit that collects and records information related to the operation of the vehicle,
A power supply control unit that controls power supply power consumed by the vehicle-mounted device,
With
The power supply control unit controls power supply power consumed by the vehicle-mounted device according to a state of the vehicle,
An operation recording device, characterized in that:

(2) The power supply control unit switches an operation mode related to power saving by using start detection and stop detection of the vehicle as a trigger.
The operation recording device according to the above (1), wherein:

(3) further comprising a secondary battery capable of storing the power generated by the independent power generation unit,
The power supply control unit switches an operation mode related to power saving according to a power generation state of the independent power generation unit,
The operation recording device according to the above (1), wherein:

(4) further comprising a vibration sensor,
The power supply control unit, based on the detection state of the vibration sensor, identifies the presence or absence of the start of the vehicle, reflects the identification result in an operation mode related to power saving,
The operation recording device according to the above (1), wherein:

(5) The casing is housed in a housing attachable to a hub cap of a front wheel of the vehicle, and the casing has a waterproof structure.
The operation recording device according to any one of the above (1) to (4), characterized in that:

  According to the operation recording device having the configuration (1), since the self-sustaining power generation unit is mounted, it is not necessary to mount a large-sized battery or the like inside the vehicle-mounted device. In addition, since the power supply control unit automatically controls the power supply consumed by the on-board unit according to the state of the vehicle, even if the independent power generation unit cannot generate power, the on-board unit uses only the power held by the small power storage unit. Vessel operation can be maintained.

  According to the operation recording device having the configuration (2), the power control unit switches the operation mode related to the power saving by using the start detection and the stop detection of the vehicle as a trigger, so that high-precision power saving control can be performed. Become. That is, when the vehicle starts, the state in which the independent power generation unit can generate power continues, and when the vehicle stops, the state in which the independent power generation unit cannot generate power continues.If such a state change is reflected in the power saving operation mode switching, In addition, it is possible to appropriately reduce the power consumed when the independent power generation unit cannot generate power.

  According to the operation recording device having the configuration of the above (3), since the vehicle-mounted device is equipped with the secondary battery, the secondary battery can be charged with the electric power generated by the independent power generation unit, and the independent power generation unit generates power. When this is not possible, the power stored in the secondary battery can be used. Further, the power control unit switches the operation mode related to power saving according to the power generation state of the independent power generation unit, so that power consumption can be appropriately managed. For example, when the independent power generation unit cannot generate power, by reducing power consumption, it is possible to suppress discharge from the secondary battery and extend the operable time of the vehicle-mounted device.

  According to the operation recording device having the above configuration (4), it is possible to easily detect a change at the start of the vehicle based on the detection state of the vibration sensor. Since the power generation environment of the self-contained power generation unit greatly changes depending on whether or not the vehicle has started, appropriate power saving control can be performed by reflecting the presence or absence of the vehicle in the operation mode.

  According to the operation recording device having the above configuration (5), since it is attached to the hub cap of the wheel, the attachment is easy and the maintenance is easy. In addition, since a decorative effect can be obtained, the commercial value increases. Further, by being mounted on the front wheels, even when the towed vehicle (trailer) changes or the luggage changes, it is hardly affected.

  ADVANTAGE OF THE INVENTION According to the operation recording device of this invention, when mounting an in-vehicle device on the wheel of a vehicle, it becomes unnecessary to mount a large-sized battery, and the necessity of maintenance due to replacement or charging is reduced and continued. It becomes possible to make it operate | move automatically. That is, since the self-contained power generation unit is mounted, it is not necessary to mount a large battery or the like inside the vehicle-mounted device. In addition, since the power supply control unit automatically controls the power supply consumed by the on-board unit according to the state of the vehicle, even if the independent power generation unit cannot generate power, the on-board unit uses only the power held by the small power storage unit. Vessel operation can be maintained.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through the modes for carrying out the invention described below (hereinafter, referred to as “embodiments”) with reference to the accompanying drawings. .

FIG. 1A is a front view showing wheels of a vehicle to which a hub cap type vehicle-mounted device is mounted, and FIG. 1B is a perspective view showing an appearance of a mounting portion of the hub cap type vehicle-mounted device. FIG. 2 is a block diagram illustrating a configuration example of a hub cap type vehicle-mounted device. FIG. 3 is an electric circuit diagram showing a configuration example of a dynamo built in the hub cap type vehicle-mounted device. FIG. 4 is a flowchart showing a main operation example in the hub cap type vehicle-mounted device. FIG. 5 is a state transition diagram showing a relationship between a state change and an operation mode during operation of the vehicle equipped with the hub cap type vehicle-mounted device.

  Specific embodiments of the present invention will be described below with reference to the drawings.

<Mounting site and appearance>
FIG. 1A shows an example of a vehicle wheel to which the hub cap type vehicle-mounted device 20 is attached. FIG. 1B shows an appearance of a mounting portion of the hub cap type vehicle-mounted device 20.

  The hub cap type vehicle-mounted device 20 shown in FIGS. 1A and 1B corresponds to an operation recording device of the present invention. The basic functions of the hub cap type vehicle-mounted device 20 are the same as those of a general digital tachograph. For example, it is possible to collect, record, and output information related to the operation of the own vehicle, such as the current position of the vehicle, the vehicle speed, the moving distance, and the time (time).

  As shown in FIG. 1A, a ring-shaped tire 10 is mounted on an outer periphery of a tire wheel 11. The center of the tire wheel 11 is fixed and supported by a plurality of bolts 13 shown in FIG. 1B on a rotatable hub 12 provided on the vehicle body side of the automobile.

  A component called a general hub cap or a wheel center cap is configured to cover the outside of the hub 12 and is fixed to the center of the tire wheel 11. The hub cap type vehicle-mounted device 20 shown in FIGS. 1A and 1B is configured to be fixed to the center of the tire wheel 11 instead of a general hub cap.

  The hub cap type vehicle-mounted device 20 shown in FIGS. 1A and 1B is housed in a housing having a substantially cylindrical shape and having a waterproof structure. The hub cap type vehicle-mounted device 20 includes a maintenance lid 20a that can be opened and closed. The maintenance lid 20a also has a waterproof structure. That is, since the hub cap type vehicle-mounted device 20 is mounted so as to be exposed outside the central portion of the tire wheel 11, it is necessary to have a waterproof structure. In addition, since the part of the maintenance lid 20a is also exposed to the outside, the maintenance can be easily performed by connecting the external device to the hub cap type vehicle-mounted device 20 using the maintenance lid 20a by wire.

  In the example shown in FIGS. 1A and 1B, it is assumed that the hub cap-type vehicle-mounted device 20 is attached to the center of the tire wheel 11. It is also conceivable to form it in a ring shape so that it can be attached to the outer periphery of the hub 12. In any case, the hub cap type vehicle-mounted device 20 needs to be mounted on a portion that rotates when the vehicle runs.

  It is assumed that the hub cap type vehicle-mounted device 20 is mounted at one of the front left and right wheels among four or more wheels of the vehicle. For example, when the hub cap type vehicle-mounted device 20 is mounted on a truck vehicle, the front wheels are hardly affected by the changing weight of the load, so that a more stable operation of the hub cap type vehicle-mounted device 20 can be expected.

<Configuration example of hub cap type vehicle-mounted device>
FIG. 2 is a block diagram showing a configuration example of the hub cap type vehicle-mounted device 20.
In the example shown in FIG. 2, a CPU 22, a gyro 23, an RTC 24, a secondary battery 25, a power supply unit 26, a monitoring circuit 27, a dynamo 30, a vibration sensor 31, a short-range wireless communication unit 32, a GPS receiver 33, antennas 34 and 35, a non-volatile memory 36, a volatile memory 37, an LED display unit 38, and a maintenance connector 39 are accommodated.

  The CPU 22 is a device formed of an integrated circuit having a microcomputer function. The CPU 22 implements various functions required for the hubcap-type vehicle-mounted device 20 by executing a software program prepared in advance.

  The dynamo 30, which will be described in detail later, has a function of generating power independently with the rotation of the wheels of the vehicle. The dynamo 30 outputs DC power. The DC power output from the dynamo 30 is supplied to internal circuits such as the CPU 22 via the power supply unit 26. The power supply unit 26 has a function of stabilizing a power supply voltage supplied to the CPU 22.

  However, since the dynamo 30 generates power based on the rotation of the wheels, stable power cannot always be generated. Therefore, the CPU 22 monitors, for example, a DC voltage of a predetermined portion output from the power supply unit 26 via a monitoring circuit (A / D converter or the like) 27, and reflects the result in the control.

  Similarly to the power supply unit 26, the secondary battery 25 can also supply DC power to the CPU 22 and the like. Further, in a situation where excess power is present in the output of the dynamo 30, the secondary battery 25 can be charged from the output of the dynamo 30 or the output of the power supply unit 26. In the present embodiment, when the vehicle is running, the power output from the dynamo 30 can be used.

  The gyro 23 can output an electric signal indicating an angular velocity due to its own rotation. In the present embodiment, the vehicle-mounted device housing 21 that supports the gyro 23 is used in a state where it is fixed to the center of the tire wheel 11 of an automobile or the like. Therefore, when the wheels of the own vehicle rotate, a signal representing the angular velocity is generated. The gyro 23 outputs.

  The RTC (real-time clock) 24 is a semiconductor integrated circuit device having a built-in clock or timer function. By controlling the RTC 24, the CPU 22 can grasp the current date and time, the day of the week, and the like, and can measure the length of time.

  The vibration sensor 31 is a sensor that can physically sense vibration in the front-rear direction of the traveling direction of the vehicle using a pendulum or the like. Specifically, it is possible to detect relatively large vibration caused by the longitudinal acceleration when the host vehicle starts moving, and relatively large vibration caused by the longitudinal acceleration when the host vehicle stops. Therefore, the CPU 22 can determine, for example, whether or not the own vehicle has started based on the state of the signal output from the vibration sensor 31.

  The short-range wireless communication unit 32 has a function of performing short-range wireless communication such as a wireless LAN. In the present embodiment, it is assumed that an on-board wireless base station 42 having a short-range wireless communication function such as a wireless LAN is mounted on the vehicle body side of the own vehicle. Therefore, the CPU 22 in the hub cap type vehicle-mounted device 20 performs narrow-area wireless communication with the on-board wireless base station 42 of the own vehicle via the narrow-area wireless communication unit 32 and the antenna 34 to transmit and receive data. be able to.

  The GPS (Global Positioning System) receiver 33 receives radio waves arriving from a plurality of GPS satellites 41 via the antenna 35, and can calculate the current position of the vehicle based on the reception time.

  The non-volatile memory 36 is a semiconductor device that can read and rewrite data by access from the CPU 22, and is a software that may store and update the operation data of the own vehicle collected by the hubcap type vehicle-mounted device 20. It is used to hold data and constant data.

  The volatile memory 37 is a semiconductor device from which data can be read and written freely by access from the CPU 22, and is used to temporarily hold data generated by the CPU 22, and the like.

  The LED display unit 38 includes a plurality of LED devices, and can display on / off, numerical values, and the like, and display the status of the hub cap type vehicle-mounted device 20 and the like. For example, when the maintenance lid 20a is made of a transparent material such as glass, a user or the like can visually recognize the display state of the LED display unit 38 from outside the hub cap type vehicle-mounted device 20.

  When the maintenance of the hub cap type vehicle-mounted device 20 is performed, the maintenance cover 20a is temporarily opened and the connection cable 40 is connected to the maintenance connector 39, so that the maintenance PC 43 outside the host vehicle and the hub cap type vehicle-mounted device 20 are maintained. Become communicable via a wired line. In addition, since the connection cable 40 includes a power supply bus line, power can be supplied from the maintenance PC 43 to the power supply unit 26 in the hub cap type vehicle-mounted device 20 via the connection cable 40 bus line. .

  It is assumed that the maintenance PC 43 is used, for example, when performing periodic maintenance on the hubcap-type vehicle-mounted device 20 or when making a backup of data of the hubcap-type vehicle-mounted device 20. .

<Configuration example of dynamo>
FIG. 3 is an electric circuit diagram showing a configuration example of the dynamo 30 built in the hub cap type vehicle-mounted device 20. Note that the configuration of this electric circuit is merely an example.
The dynamo 30 shown in FIG. 3 includes a permanent magnet 30a and an electric coil 30b. The electric coil 30b is fixed in the vehicle-mounted device housing 21 of the hub-cap type vehicle-mounted device 20. The permanent magnet 30a is fixed to a predetermined position on the vehicle body side of the host vehicle, and is disposed so as to always face the electric coil 30b at a relatively short distance.

  When the vehicle travels, the wheels rotate, and the movement of the electric coil 30b accompanying this rotation causes the permanent magnet 30a and the electric coil 30b to relatively rotate and move. Therefore, an alternating current is induced on the electric coil 30b side by the electromagnetic induction effect generated between the permanent magnet 30a and the electric coil 30b.

  As shown in FIG. 3, the rectifier circuit 30c is connected to the output terminal of the electric coil 30b. The rectifier circuit 30c rectifies an AC current generated in the electric coil 30b by the power generation and converts the AC current into a DC (pulsating) power. The smoothing capacitor 30d smoothes the pulsating current output from the rectifier circuit 30c and generates DC power having a relatively stable voltage. The DC power generated by the dynamo 30 is output from the output terminal 30e and supplied to the power supply unit 26 shown in FIG.

  That is, since the dynamo 30 mounted inside the hub cap type vehicle-mounted device 20 shown in FIG. 2 has an independent power generation function, the power supply power is supplied from the vehicle body side of the own vehicle to the hub cap type vehicle-mounted device 20. There is no need to supply them, and there is no need to connect them with a cable or the like. When the wheels stop and the dynamo 30 cannot generate power, the DC power of the secondary battery 25 built in the hub cap type vehicle-mounted device 20 can be used.

  Further, since wireless communication can be performed between the hubcap-type vehicle-mounted device 20 and the vehicle body by using the short-range wireless communication unit 32, it is not necessary to connect the hubcap-type vehicle-mounted device 20 and the vehicle body with a signal cable or the like. Absent. Therefore, attachment and detachment of the hub cap type vehicle-mounted device 20 to and from the tire wheel 11 are extremely easy.

<Main operation example>
FIG. 4 is a flowchart showing a main operation example of the hub cap type vehicle-mounted device 20.
That is, the CPU 22 shown in FIG. 2 executes the operation shown in FIG. 4 in accordance with the stored program, so that the characteristic functions of the in-vehicle hubcap device 20 can be realized.

  Although not shown, the CPU 22 can recognize one rotation of the wheels of the own vehicle at the time of initialization after the hub cap type vehicle-mounted device 20 is attached to the vehicle. That is, when the wheel rotates, the change in the angular velocity output by the gyro 23 is monitored to recognize the change every rotation. Thereafter, while monitoring the output signal of the gyro 23, the CPU 22 generates a rotation signal of, for example, 8 pulses per rotation of the wheel inside the CPU 22, and grasps the operation state of the own vehicle based on the rotation signal.

  The operation of FIG. 4 will be described below. The CPU 22 selects the “ultra-low-consumption mode” in S11 because the dynamo 30 does not generate power and only needs to use the power of the secondary battery 25 when the vehicle is not running before the operation starts. . In this “ultra-low power consumption mode”, the execution of the program is continued while monitoring the presence or absence of a change in the state, thereby minimizing the power consumption of the hubcap-type vehicle-mounted device 20.

  If the “vibration trigger” is detected in step S12 by the signal output from the vibration sensor 31 in the state where the “ultra-low consumption mode” is selected, the CPU 22 proceeds to the next step S13. That is, detection of a large vibration in a state where the own vehicle is stopped means that the own vehicle has started running, and therefore, the start of power generation in the dynamo 30 is predicted in S12.

  The CPU 22 selects the “low-consumption mode” in S13, and starts the operation of recording the operation state of the own vehicle in this mode. That is, data such as a vehicle speed and a traveling distance calculated from the angular velocity signal output from the gyro 23, current position information obtained by the GPS receiver 33, and current time are acquired. However, in the “low consumption mode”, the power consumption of the short-range wireless communication unit 32, the GPS receiver 33, and the like is suppressed. Specifically, the short-range wireless communication unit 32 stops searching for a communication partner. Further, the GPS receiver 33 does not operate except at an arbitrary timing when the CPU 22 transmits a predetermined command.

  In the “low power consumption mode”, the CPU 22 monitors the voltage output from the dynamo 30 via the monitoring circuit 27, and identifies whether a sufficiently high voltage appears in a stable state in S14. If it is not stable, the operation data collected in the “low consumption mode” is written and stored in the nonvolatile memory 36 in S15.

  When the voltage is stabilized, the CPU 22 proceeds from S14 to S16 and switches to the “normal mode”. Further, in the “normal mode”, since it is not necessary to reduce power consumption particularly, normal wireless communication using the short-range wireless communication unit 32 is possible, and periodic communication using the GPS receiver 33 is performed. The current position information can also be obtained. That is, the short-range wireless communication unit 32 repeats the search for the communication partner at a cycle of, for example, minutes. The GPS receiver 33 repeats communication, for example, every second and updates the current position. The CPU 22 writes and stores the latest current position information acquired by the GPS receiver 33 in a storage area on the nonvolatile memory 36 together with other operation data. When surplus power is generated in the output of the dynamo 30 in the “normal mode”, the rechargeable battery 25 is charged using the surplus power.

  In the “normal mode”, the CPU 22 determines in S17 whether or not untransmitted data exists in the operation data stored in the nonvolatile memory 36. When there is untransmitted data, the process proceeds from S17 to S18, and when there is no untransmitted data, the process proceeds from S17 to S21.

  The CPU 22 determines whether or not wireless communication can be performed with the “communication destination” registered in advance in S18. If the CPU 22 can perform wireless communication with the “communication destination”, that is, if a communicable partner is found, the CPU 22 sends untransmitted operation data on the nonvolatile memory 36 to the “communication destination” in S19. Send. The operation data whose transmission has been completed is deleted from the non-volatile memory 36 or stored as non-transmitted data in the non-volatile memory 36 for a certain period of time, for example. If the CPU 22 cannot wirelessly communicate with the “communication destination”, the CPU 22 continues to save the untransmitted operation data on the nonvolatile memory 36 (S20).

  The “communication destination” in S18 corresponds to a device outside the vehicle such as the management terminal 45 shown in FIG. Of course, another vehicle-mounted device on the vehicle body of the own vehicle may be the “communication destination”. For example, by connecting the on-board wireless base station 42 on the vehicle to a predetermined wide area wireless communication module (not shown), it is possible to connect to the management terminal 45 via the Internet 44 or the like.

  The CPU 22 recognizes whether or not the own vehicle is in the “stop” state by identifying, for example, whether or not the change in the angular velocity output by the gyro 23 has become 0 in S21. If the host vehicle is in the "stop" state, the process proceeds to the next step S22. If not, the process returns to S17 to repeat the above processing.

The CPU 22 ends the operation of recording new operation data in S22, and ends the operation of data transmission. Thereby, useless power consumption can be suppressed.
The CPU 22 compares the length of time elapsed from the detection of the "stop" state of the host vehicle in S21 in the "normal mode" with the first predetermined time in S23, thereby determining whether the vehicle is in the "continuous stop" state. Identify. If it is in the "continuous stop" state, the process proceeds to S24, and if it is not in the "continuous stop" state, the process returns to S17 to repeat the same processing.

  The CPU 22 switches from the “normal mode” to the “low consumption mode” in S24. That is, the operation of the short-range wireless communication unit 32 and the GPS receiver 33 is stopped to suppress the power consumption, and only the operation with relatively low power consumption is continued.

  The CPU 22 compares the length of time elapsed after switching to the “low consumption mode” in S24 with the second predetermined time in S25 to determine whether the “continuous stop” state continues for a long time. I do.

  If the “continuous stop” state continues for a long time, the CPU 22 proceeds from S25 to S26, and switches from the “low-consumption mode” to the “ultra-low-consumption mode”. That is, while the power consumption is suppressed to a minimum, the output of the vibration sensor 31 is monitored and the vehicle enters a state of waiting until the vehicle starts moving. If the time from the "continuous stop" state is relatively short, the process returns from S25 to S17, and the operation in the same state is continued.

<Changes in the state of the car during operation and operation modes>
FIG. 5 is a state transition diagram showing a relationship between a state change and an operation mode of the automobile 50 to which the hub cap type vehicle-mounted device 20 is mounted during operation.

  As shown in FIG. 5, in a state C1 before the automobile 50 such as a truck to which the hubcap-type vehicle-mounted device 20 is mounted starts operating, the operation mode M1 of the hubcap-type vehicle-mounted device 20 is “ultra-low consumption mode”. It is. That is, the hub cap type vehicle-mounted device 20 monitors the vibration trigger of the signal output from the vibration sensor 31 and waits until the vehicle 50 starts running.

  In the state C2 in which the automobile 50 has started traveling, the operation mode M2 of the hubcap-type vehicle-mounted device 20 switches from the “ultra-low-consumption mode” to the “low-consumption mode” due to the occurrence of a vibration trigger accompanying the start of rotation of the wheels. Thereby, the hub cap type vehicle-mounted device 20 repeatedly performs the operation of collecting and recording the operation data in the “low consumption mode”.

  Immediately after the automobile 50 starts running, the rotation of the wheels is low, and the output voltage of the dynamo 30 is not stable. Therefore, the hub cap type vehicle-mounted device 20 can suppress consumption of the electric power stored in the secondary battery 25 by selecting the “low consumption mode” in the state C2.

  In the state C3 when the car 50 is running stably, the output voltage of the dynamo 30 is stable, and therefore the hub cap on-vehicle device 20 changes the operation mode M3 from the “low consumption mode” to the “normal mode”. Switch to Since there is no need to suppress power consumption in the “normal mode”, the in-vehicle cap device 20 updates the position information in the GPS receiver 33 and searches for the communication partner in the short-range wireless communication unit 32 in a short cycle. Execute. The hub cap type vehicle-mounted device 20 repeats the collection and recording of the operation data in a short cycle, and transmits the operation data stored in the nonvolatile memory 36 to the on-vehicle wireless base station 42 by the short-range wireless communication. The operation data is relayed by the on-board wireless base station 42 and transferred to the management terminal 45 via the Internet 44 by using wide area wireless communication.

  In the state C4 in which the car 50 is temporarily stopped, the power generation of the dynamo 30 is stopped. However, since the car 50 may resume running immediately, the operation mode of the hub cap type vehicle-mounted device 20 may be changed. M4 continues the “normal mode”. However, since the automobile 50 does not move, the recording of the operation data ends, the communication between the hubcap-type vehicle-mounted device 20 and the on-board wireless base station 42 also ends, and wasteful power consumption is suppressed.

  On the other hand, in a state C5 in which the wheels are continuously stopped for a predetermined time or more, such as when the car 50 is parked, the operation mode M5 First, the mode is switched from the “normal mode” to the “low-consumption mode”. Further, when the state C5 of the “low-consumption mode” is continuously changed to the state C1 for a predetermined time or more, the operation mode M1 of the in-vehicle hub device 20 is switched from the “low-consumption mode” to the “ultra-low-consumption mode”.

  In a company or the like that manages the operation of the automobile 50 such as a truck, the management terminal 45 collects the operation data from the hub cap type vehicle-mounted device 20 attached to each automobile 50 operating in a remote place, and executes the vehicle in almost real time. For example, the situation such as the current position is displayed on the screen as shown in FIG. Therefore, the manager who handles the management terminal 45 can grasp the operation status of each vehicle.

  As for the time of the operation data recorded by the hub cap type vehicle-mounted device 20, the CPU 22 calculates a more appropriate time based on the current time obtainable from the RTC 24 and the GPS time obtainable from the GPS receiver 33. I do. Further, the travel distance [km] of the own vehicle in the operation data recorded by the hub cap type vehicle-mounted device 20 is determined by the CPU 22 based on the number of rotations of the wheels that can be grasped from the output signal of the gyro 23 and a predetermined constant. calculate. In addition, the traveling speed [km / h] of the own vehicle in the operation data recorded by the hub cap type vehicle-mounted device 20 is calculated from the output signal of the gyro 23 and the number of rotations of the wheels per second and a predetermined constant. Is calculated by the CPU 22 based on the above.

<Advantages of hub cap type vehicle-mounted device 20>
Since the hub cap type vehicle-mounted device 20 has a built-in power source, there is no need to wire the vehicle body to supply power to the power source. Therefore, the hub cap type vehicle-mounted device 20 can be extremely easily mounted on the rotating tire wheel 11. Further, since the hub cap type on-vehicle device 20 communicates with the on-board wireless base station 42 on the vehicle body by the short-range wireless communication using the short-range wireless communication unit 32, wiring for data communication is unnecessary. is there.

  In addition, since the hub cap type vehicle-mounted device 20 is equipped with the dynamo 30 that performs independent power generation as a power source, it is possible to reduce the size and weight. Further, the hub cap type vehicle-mounted device 20 automatically selects the above-mentioned “low-consumption mode” or “ultra-low-consumption mode” in a situation where the wheels stop and the dynamo 30 cannot generate power or the output is unstable. Therefore, discharge of the secondary battery 25 can be suppressed. Therefore, the hub cap type vehicle-mounted device 20 can be continuously used for a long period of time without performing maintenance such as special charging.

  In addition, since the power supply of the hub cap type vehicle-mounted device 20 is independent from the vehicle body side, the battery on the vehicle body side can be used with no extra load and can be used with confidence. Further, by covering the outside of the hub 12 with the hub cap type vehicle-mounted device 20, it is possible to prevent rust from being generated on the hub 12. In addition, a decorative effect can be obtained by exposing the hub cap type vehicle-mounted device 20 to the outside.

Here, the features of the operation recording device according to the above-described embodiment of the present invention will be briefly summarized and listed below in [1] to [5]. [1] A wheel (rotating together with a wheel (tire 10) in a vehicle ( An operation recording device (a hub cap type vehicle-mounted device 20) configured as a vehicle-mounted device mounted on a tire wheel 11) or a rotating part (hub 12) in the vicinity thereof;
An independent power generation unit (dynamo 30) for generating electric power consumed in the on-vehicle device;
A wireless communication unit (narrow-area wireless communication unit 32) capable of transmitting data using a wireless signal;
An information recording unit (CPU 22, S15, S20) for collecting and recording information relating to the operation of the vehicle;
A power supply control unit (CPU 22) for controlling power supply power consumed by the vehicle-mounted device;
With
The power supply control unit controls power supply power consumed by the vehicle-mounted device according to a state of the vehicle (S11 to S26).
An operation recording device, characterized in that:

[2] The power control unit switches operation modes related to power saving, triggered by the vehicle start detection (S12) and the stop detection (S21) (S13, S22).
The operation recording device according to the above [1], wherein:

[3] A secondary battery (25) capable of storing the power generated by the independent power generation unit,
The power control unit switches an operation mode related to power saving according to a power generation state of the independent power generation unit (S14, S16),
The operation recording device according to the above [1], wherein:

[4] A vibration sensor (vibration sensor 31) is further provided,
The power control unit identifies whether the vehicle has started based on the detection state of the vibration sensor, and reflects the identification result in an operation mode related to power saving (S12, S13).
The operation recording device according to the above [1], wherein:

[5] It is housed in a housing (21) attachable to the hub cap of the front wheel of the vehicle, and the housing has a waterproof structure (see FIGS. 1 (a) and 1 (b)).
The operation recording device according to any one of the above [1] to [4], characterized in that:

Reference Signs List 10 tire 11 tire wheel 12 hub 13 bolt 20 hub cap type vehicle-mounted device 20a maintenance lid 21 vehicle-mounted device housing 22 CPU
23 Gyro 24 RTC
Reference Signs List 25 secondary battery 26 power supply unit 27 monitoring circuit 30 dynamo 30a permanent magnet 30b electric coil 30c rectifier circuit 30d smoothing capacitor 30e output terminal 31 vibration sensor 32 narrow-range wireless communication unit 33 GPS receiver 34, 35 antenna 36 nonvolatile memory 37 volatile memory 38 LED display section 39 maintenance connector 40 connection cable 41 GPS satellite 42 on-board wireless base station 43 maintenance PC
44 Internet 45 Management terminal 50 Automobile C1, C2, C3, C4, C5 State M1, M2, M3, M4, M5 Operation mode

Claims (5)

An operation recording device configured as an in-vehicle device mounted on a wheel that rotates together with the wheel in a vehicle, or a rotation part near the wheel,
An independent power generation unit that generates electric power consumed in the on-vehicle device,
A wireless communication unit capable of transmitting data using a wireless signal,
An information recording unit that collects and records information related to the operation of the vehicle,
A power supply control unit that controls power supply power consumed by the vehicle-mounted device,
With
The power supply control unit controls power supply power consumed by the vehicle-mounted device according to a state of the vehicle,
An operation recording device, characterized in that: The power supply control unit, using the start detection of the vehicle and the stop detection as a trigger, switches an operation mode related to power saving,
The operation recording device according to claim 1, wherein: Further comprising a secondary battery capable of storing the power generated by the independent power generation unit,
The power supply control unit switches an operation mode related to power saving according to a power generation state of the independent power generation unit,
The operation recording device according to claim 1, wherein: Further comprising a vibration sensor,
The power supply control unit, based on the detection state of the vibration sensor, identifies the presence or absence of the start of the vehicle, reflects the identification result in an operation mode related to power saving,
The operation recording device according to claim 1, wherein: The vehicle is housed in a housing attachable to a hub cap portion of a front wheel of the vehicle, and the housing has a waterproof structure.
The operation recording device according to any one of claims 1 to 4, wherein:

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