JP4400505B2 - Radio module for electronic license plates - Google Patents

Description

  The present invention relates to a control unit that controls the overall operation of the radio wave module, an RF unit that performs communication operation, a storage unit that stores memory information, and an abnormality detection unit that detects whether an abnormality related to security has occurred. And at least the control unit, the RF unit, and the storage unit operate with the power supplied from the main battery as the operating power in a mode in which the main battery is normally attached to the radio module main body. The present invention relates to a radio module for an electronic license plate that is configured as described above.

  In a radio module for an electronic license plate, circuit elements, operating power supplies, etc. are sealed in a single housing in order to protect memory information (for example, vehicle verification information and security information) stored in a storage unit. In general, a battery is employed as an operating power supply. By the way, it is necessary to replace the battery when the capacity of the battery as the operating power source is exhausted. However, in the configuration in which the battery is sealed in the casing as described above, the battery cannot be replaced alone. For this reason, the entire radio wave module has to be replaced, and as a result, there is a problem that the replacement period becomes extremely short compared with the product life of other parts such as circuit elements.

  As a method of solving this problem, it is conceivable to make the battery a structure that can be replaced independently. However, if the battery is simply made to be a structure that can be replaced independently, the operation to the storage unit is performed at the stage where the battery is replaced. Since the supply of electric power is temporarily stopped, a new problem that the memory information stored in the storage unit (particularly the volatile memory) cannot be properly maintained occurs, and the product As a battery is not mounted in the storage stage in the middle of distribution, a new problem arises that security operations cannot be performed properly.

On the other hand, some in-vehicle security devices are configured to continue the security operation by supplying the operating power from the backup battery even when the main power supply is shut off after starting the security operation. (For example, refer to Patent Document 1).
JP 2004-140942 A

  However, in the case described in Patent Document 1 described above, when the capacity of the backup battery is exhausted, it is difficult to continue the security operation thereafter, and at the stage where the battery as described above is replaced. The problem that the memory information stored in the storage unit cannot be properly retained and the problem that the security operation cannot be appropriately performed at the storage stage in the middle of distribution as a product has not been solved. .

  The present invention has been made in view of the above circumstances, and an object of the present invention is to increase the product life as a radio wave module and to store the memory in the storage unit even when the battery is replaced. It is an object of the present invention to provide a radio module for an electronic license plate that can appropriately hold information and can appropriately perform a security operation even in a storage stage in the middle of distribution as a product.

  According to the first aspect of the present invention, whether a control unit that controls the overall operation of the radio wave module, an RF unit that performs communication operation, a storage unit that stores memory information, or an abnormality related to security has occurred. An abnormality detection unit that detects whether or not the main battery is normally attached to the radio module main body, and at least the control unit, the RF unit, and the storage unit supply power from the main battery as operating power. The main battery is detachable from the main body of the radio module alone, and the sub battery is mounted separately from the main battery, and the main battery is normally attached to the main body of the radio module. Even if it is not a mode, the memory information stored in the storage unit is retained by supplying operating power from the sub battery to at least the storage unit and the abnormality detection unit. Whether or not an abnormality related to security has occurred it is detected by the abnormality detecting unit with.

As a result, the main battery is configured to be detachable from the radio module main body alone. When the capacity of the main battery is exhausted, the main battery with the exhausted capacity is replaced with a main battery with sufficient capacity. The product life as a radio wave module can be extended. In addition, even if the main battery is not properly attached to the radio module main body, the operation power is supplied from the sub battery to at least the storage unit and the abnormality detection unit. Even at the stage of operation, the supply of operating power to the storage unit is not temporarily stopped, the memory information stored in the storage unit can be appropriately retained, and storage in the middle of being distributed as a product Even if the main battery is not installed at the stage, the security operation can be appropriately performed. In addition, there is a wakeup unit that detects whether or not a condition for starting the control unit is established, and a condition for starting the control unit by determining the detection result of the wakeup unit or the detection result of the abnormality detection unit. A determination unit that activates the control unit when it is detected that it has been established, and operating power is supplied from the sub battery to the determination unit even if the main battery is not normally attached to the radio module main body. Since the detection result of the abnormality detection unit is determined by the determination unit, the determination unit that originally determines the detection result of the wakeup unit is a functional block that determines the detection result of the abnormality detection unit. Can be operated together with the abnormality detection unit, making it possible to make a more reliable abnormality determination, effectively enabling the determination unit to determine the detection result of the wakeup unit originally It is possible to use.

  According to the invention described in claim 2, even when the main battery is not normally attached to the radio module main body, when the abnormality detection unit detects that an abnormality related to security has occurred. Since part or all of the memory information stored in the storage unit is erased, it is possible to prevent the memory information from being stolen or tampered with when an abnormality related to security occurs. Can do.

According to the invention described in claim 3 , the low-frequency oscillation unit that supplies a low-frequency clock to the determination unit as an operation clock is provided, and triggers that the abnormality detection unit has detected that a security-related abnormality has occurred. The low-frequency oscillator is configured so that the low-frequency clock is supplied from the low-frequency oscillator to the determination unit, so that the operation period of the low-frequency oscillator is not affected even when the main battery is not properly attached to the radio module main body. By suppressing the power to the necessary minimum, it is possible to suppress the power consumption of the low frequency oscillating unit and to suppress the power consumption of the entire radio module.

According to the fourth aspect of the invention, the power supply unit that switches the operating power supply source to each functional block between the sub battery and the main battery is provided, and the operating power supply source to each functional block is the sub battery. When the main battery is normally attached to the radio module main body, the operating power supply source to each functional block is Since the battery is switched from the main battery to the main battery by the power supply unit, the consumption of the capacity of the sub battery can be suppressed to a necessary minimum, and the product life as a radio wave module can be further extended.

According to the invention described in claim 5 , the main battery can be attached to and detached from the radio module main body by the attaching / detaching mechanism having a waterproof structure without removing the radio module main body from the license plate, and the attaching / detaching direction thereof. Since it is configured to be either upward, lateral or downward in the license plate, it is possible to ensure waterproofness at the attachment / detachment location and from the upward, lateral or downward direction of the license plate. Detachable.

According to the invention described in claim 6 , since the main battery and the radio module main body are partly or entirely covered with the cover in a mode in which the main battery is normally attached to the radio module main body. In addition, it is possible to prevent dirt and water droplets from being directly attached to the radio module, and since the attachment / detachment portion is not exposed to the outside, it is possible to avoid the spontaneous removal of the attachment. It is also possible to avoid the intentional removal by a third party.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 2 shows a cross-sectional plan view of a radio module main body and mounting stays which are components of a radio module for an electronic license plate (hereinafter simply referred to as a radio module). The radio module 1 has a structure in which a radio module main body 2 is attached to a license plate 4 via an attachment stay 3. In this case, the radio wave module 1 may be attached to a license plate disposed at the front end portion of the vehicle, or may be attached to a license plate disposed at the rear end portion of the vehicle.

  The radio wave module main body 2 has a two-stage recess 6 whose casing 5 opens on the number plate 4 side (lower side in FIG. 2) and a recess 7 that opens on the opposite side to the license plate 4 (upper side in FIG. 2). Are arranged in a shape along the horizontal direction (left and right direction in FIG. 2) of the license plate 4. In the two-stage concave portion 6, the side opposite to the license plate 4 (the side having the smaller width dimension) is a sub battery housing portion 8, and the sub battery housing portion 8 includes a sub battery composed of, for example, a button battery. 9 is mounted on the upper surface side (upper side in FIG. 2) of the lid member 10 in a manner of being positioned by the positioning portions 11a and 11b, and the printed circuit board 12 is on the opposite side of the license plate 4 as viewed from the sub battery 9. Has been placed. The printed circuit board 12 has a patch antenna 13 formed, for example, by a conductor pattern on the front surface side (upper side in FIG. 2), and constitutes functional blocks described later in detail on the rear surface side (lower side in FIG. 2). A circuit element 14 is mounted.

  The positive electrode 9 a of the sub battery 9 is connected to the printed circuit board 12 through an arch-shaped terminal 15, and the negative electrode 9 b of the sub battery 9 is connected to the printed circuit board 12 through a linear terminal 16. In addition, buffer members (cushion members) 17 a and 17 b for relaxing stress acting on the printed circuit board 12 from the housing 5 are interposed between the housing 5 and the printed circuit board 12. In the above-described sub battery housing portion 8, the lid member 10 is fixed to the step portions 5a and 5b of the housing 5, so that the sub battery 9, the printed board 12, the antenna 13, the circuit element 14, and the like are sealed. Has been.

  Between the housing 5 and the printed circuit board 12, for example, a contact switch 18 that functions as an abnormality detection unit to be described later is disposed. In the contact switch 18, one contact 18 a is fixed to the printed circuit board 12 and the other contact 18 b is fixed to the housing 5, and the radio wave module body 2 is normally sealed. The contact 18a and the other contact 18b are in contact with each other due to stress acting in the direction facing each other. For example, a third party can steal or destroy the radio wave module 1. When the casing 5 of the radio wave module body 2 is removed, the casing 5 and the printed circuit board 12 are separated from each other, and one contact 18a and the other contact 18b are separated.

  The main body side connector 19 (attachment / detachment mechanism in the present invention) is formed integrally with the housing 5, the positive terminal 20 is connected to the printed circuit board 12 through the positive lead 21, and the negative terminal 22 is connected. It is connected to the printed circuit board 12 through the negative electrode lead wire 23. On the other hand, the recess 7 is a mounting bolt mounting portion 26 to which the mounting bolt 24 is mounted via the seal 25, and a through hole 7a through which the shaft 24a of the mounting bolt 24 is passed is formed at a predetermined portion thereof. .

  The mounting stay 3 functions as a component for mounting the radio wave module main body 2 to the number plate 4. The housing 27 has a recess 28 and a plate-shaped portion 29 that open on the opposite side of the number plate 4. Are arranged in a shape along the horizontal direction of the license plate 4. In the recess 28, the side walls 30 a and 30 b are formed along the vertical direction of the number plate 4, and the bottom wall 31 (see FIG. 3) is formed along the left and right direction of the number plate 4. In this case, the dimension between the side wall portions 30a and 30b (see “W1” in FIG. 2) is set slightly larger than the dimension in the width direction of the main battery 32 described later (see “W2” in FIGS. 6 and 7). Has been.

  Further, as shown in FIG. 4, in a mode in which the radio wave module main body 2 is normally attached to the license plate 4 via the attachment stay 3, the concave portion 28 of the attachment stay 3 is located in the concave portion 6 of the radio wave module main body 2. Thus, the main battery housing portion 33 is formed by being fitted below the lid member 10. In this case, the dimension between the bottom surface of the recess 28 and the lid member 10 (see “D1” in FIG. 4) is slightly larger than the dimension in the depth direction of the main battery 32 described later (see “D2” in FIG. 7). Is set. On the other hand, the plate-like portion 29 is formed with a hooking portion 34 for wrapping around the periphery of the license plate 4 and hooking on the predetermined portion in the same manner as the concave portion 7 of the radio wave module body 2 described above. A through hole 29a is formed through which the shaft 24a of the mounting bolt 24 passes.

  As shown in FIGS. 3 to 5, the radio wave module main body 2 and the mounting stay 3 constructed as described above are attached to the corners of the license plate 4 together with the seals 25 by the mounting bolts 24 (in this embodiment, the license plate 4 is front-facing). Is attached to the upper left of the license plate 4 as viewed from the top. Then, after the radio wave module body 2 and the mounting stay 3 are attached to the number plate 4, the upper part of the mounting bolt 24 is sealed with a seal 41.

  As shown in FIG. 6, the main battery 32 has a shape in which a battery-side connector 36 (detachment mechanism in the present invention) is drawn from a substantially rectangular battery body 35. In the battery side connector 36, a positive electrode terminal 37 and a negative electrode terminal 38 are arranged side by side along the depth direction of the battery main body 35, and the positive electrode terminal 37 is connected to the battery main body 35 via a positive electrode lead wire 39. At the same time, the negative electrode terminal 38 is connected to the battery body 35 via the negative electrode lead wire 40.

  In this case, in the aspect in which the main battery 32 is normally accommodated in the main battery accommodating portion 33, that is, in the aspect in which the main battery 32 is normally attached to the radio wave module body 2, the battery-side connector 36 has been described above. The positive electrode terminal 37 of the battery side connector 36 and the positive electrode terminal 20 of the main body side connector 19 are electrically connected to each other, and the negative electrode terminal 38 of the battery side connector 36 and the main body are connected to the main body side connector 19. The negative electrode terminal 22 of the side connector 19 is conducted, and the power of the main battery 32 is transmitted to the radio module main body 2 side via the battery side connector 36 and the main body side connector 19 and supplied to the circuit element 14. Yes. In this case, when the battery side connector 36 is normally fitted to the main body side connector 19, the claw portion 36a of the battery side connector 36 and the claw portion 19a of the main body side connector 19 are locked. . Both the main body side connector 19 and the battery side connector 36 have a waterproof structure.

  In the present embodiment, since the main battery housing portion 33 is configured to have an opening above the number plate 4, the main battery 32 is attached and detached from above the number plate 4 as shown in FIG. Will be. Here, FIG. 7 shows an aspect in which the main battery 32 is normally accommodated in the main battery accommodating portion 33, that is, an aspect in which the main battery 32 is normally attached to the radio wave module body 2.

  Next, the electrical configuration of the radio wave module 1 will be described with reference to FIG. The radio wave module 1 includes, as functional blocks, a control unit 51, a switch unit 52, an RF unit 53, a high-frequency oscillation unit 54, a nonvolatile memory 55 (a storage unit in the present invention), a wake-up unit 56, and the contact switch 18 described above. An abnormality detection unit 57, a determination unit 58, a low-frequency oscillation unit 59, a volatile memory 60 (a storage unit referred to in the present invention), and a power supply unit 61 are configured. Each of these functional blocks is realized by the circuit element 14 described above.

  The power supply unit 61 switches the supply source of the operating power to these functional blocks between the sub battery 9 and the main battery 32. More specifically, when the main battery 32 is normally attached to the radio module main body 2, the power supply unit 61 connects a power supply line between the main battery 32 and each functional block. In addition, the power supply line between the sub battery 9 and each functional block is disconnected, whereby the power supplied from the main battery 32 is supplied to the control unit 51, the switch unit 52, the RF unit 53, the high frequency oscillation unit 54, and the nonvolatile memory. 55, the wakeup unit 56, the abnormality detection unit 57, the determination unit 58, the low frequency oscillation unit 59, and the volatile memory 60 can be supplied as operating power. That is, when the main battery 32 is normally attached to the radio module main body 2, the power supply unit 9 gives priority to the main battery 32 over the sub battery 9, so that the main battery 32 becomes the radio module main body. 2 is switched to the main battery 32 from the sub-battery 9 using the fact that it is normally attached to 2 as a trigger.

  On the other hand, the main battery 32 is not normally attached to the radio module main body 2 (the main battery 32 is not attached to the radio module main body 2 or the battery main body 35 is not connected to the main battery housing portion 33. If the battery side connector 36 is not properly fitted to the main body side connector 19 even if it is housed in the battery, the power supply unit 61 supplies power between the sub battery 9 and each functional block. By connecting the lines and disconnecting the power supply line between the main battery 32 and each functional block, the power supplied from the sub-battery 9 operates only at least in the functional block of the abnormality detection unit 57 and the volatile memory 60. Supply as electric power. In this case, the power supplied from the sub-battery 9 may be constantly supplied as operating power to the determination unit 58 and the low-frequency oscillation unit 59, but in order to further reduce power consumption, an abnormality related to security is required. It is desirable to supply operating power to the determination unit 58 and the low-frequency oscillation unit 59 by using the time point when the abnormality detection unit 57 detects that the occurrence of the occurrence of the occurrence of the occurrence of the occurrence of the occurrence of the occurrence of the occurrence of the occurrence of the occurrence of the occurrence of the occurrence of the failure.

  In other words, in the above configuration, if the main battery 32 is normally attached to the radio module main body 2, the control unit 51, the switch unit 52, the RF unit 53, the high-frequency oscillation unit 54, the non-volatile All of the functional blocks of the memory 55, the wakeup unit 56, the abnormality detection unit 57, the determination unit 58, the low frequency oscillation unit 59, and the volatile memory 60 operate using the power supplied from the main battery 32 as the operation power (FIG. 1). On the other hand, if the main battery 32 is not normally attached to the radio wave module body 2, at least only the functional blocks of the abnormality detector 57 and the volatile memory 60 are sub When the abnormality detection unit 57 detects that an abnormality relating to security has occurred by operating the power supplied from the battery 9 as operating power, the determination unit 58 and Operating a power function blocks of the low frequency oscillator 59 is also supplied from the sub-battery 9 as operating power (see in FIG. 1 "b").

  Here, the processing of each functional block described above will be described. When the radio wave signal is captured by the antenna 62 and input via the switch unit 52, the wakeup unit 56 detects, for example, the radio wave signal by envelope detection and outputs the signal to the determination unit 58. The determination unit 58 determines whether or not a condition for starting the radio wave module 1 (control unit 51) is established based on the signal detected by the wakeup unit 56, and that the condition for starting is established. Is detected, an activation signal is output to the control unit 51. When the activation signal is input from the determination unit 58, the control unit 51 operates using the high-frequency clock supplied from the high-frequency oscillation unit 54 as an operation clock, controls the communication operation of the RF unit 53 and the nonvolatile memory 55. The memory information (such as vehicle verification information and security information) is controlled for reading and writing.

  The volatile memory 60 functions as a backup memory for backing up, for example, storing memory information stored in the nonvolatile memory 55 and holding information related to security. Memory information as backup information Is remembered. As described above, the abnormality detection unit 57 removes the casing 5 of the radio module main body 2 for the purpose of, for example, a third party stealing or destroying the radio module 1 as described above, thereby causing one contact 18a of the contact switch 18 to be removed. And the other contact 18 b are separated, an abnormality detection signal is output to the determination unit 58 and the low frequency oscillation unit 59.

  When the abnormality detection signal is input from the abnormality detection unit 57, the low frequency oscillation unit 59 supplies a low frequency clock to the determination unit 58 using the input of the abnormality detection signal as a trigger. When the abnormality detection signal is input from the abnormality detection unit 57, the determination unit 58 operates using the low-frequency clock supplied from the low-frequency oscillation unit 59 as an operation clock, and a condition for determining that abnormality is detected is satisfied. When it is determined whether or not the condition is established, an abnormality notification signal is also output to the control unit 51 in addition to outputting an activation signal to the control unit 51. When the abnormality notification signal is input from the determination unit 58 together with the activation signal from the determination unit 58, the control unit 51 operates using the high frequency clock supplied from the high frequency oscillation unit 54 as an operation clock, and is stored in the nonvolatile memory 55. In addition to erasing part or all of the information, part or all of the memory information stored in the volatile memory 60 is also erased.

  As described above, according to the first embodiment, in the radio wave module 1, the main battery 32 is configured to be detachable from the radio wave module body 2, and therefore when the capacity of the main battery 32 is consumed, By exchanging the main battery 32 whose capacity has been consumed with the main battery 32 having a sufficient capacity, the product life of the radio wave module 1 can be extended. In addition, even when the main battery 32 is not normally attached to the radio module main body 2, the operation power is supplied from the sub battery 9 to the volatile memory 60 and the abnormality detection unit 57. Even when the main battery 32 is replaced, the supply of operating power to the volatile memory 60 is not temporarily stopped, and the memory information stored in the volatile memory 60 can be appropriately retained. In addition, the security operation can be appropriately performed even if the main battery 32 is not mounted in the storage stage in the middle of distribution as a product.

  Even when the main battery 32 is not normally attached to the radio module main body 2, if the abnormality detection unit 57 detects that an abnormality relating to security has occurred, the volatile memory 60 stores the abnormality. Since a part or all of the stored memory information is erased, it is possible to prevent the memory information from being stolen or falsified when a security related abnormality occurs.

  Even if the main battery 32 is not normally attached to the radio module main body 2, the operation power is supplied from the sub battery 9 to the determination unit 58, so that the detection result of the abnormality detection unit 57 is obtained. Since it is configured to be determined by the determination unit 58, the determination unit 58 that originally determines the detection result of the wakeup unit 56 can be operated as a functional block that determines the detection result of the abnormality detection unit 57, A more reliable abnormality determination can be performed in combination with the abnormality detection unit 57, and the determination unit 58 that originally determines the detection result of the wake-up unit 56 can be effectively utilized.

  Further, since the low-frequency clock is supplied from the low-frequency oscillation unit 59 to the determination unit 58 triggered by the fact that the abnormality detection unit 57 has detected that an abnormality related to security has occurred, the main battery 32 Even if the radio wave module body 2 is not normally mounted, the power consumption of the low frequency oscillating unit 59 is suppressed by suppressing the operation period of the low frequency oscillating unit 59 to the minimum necessary. Thus, power consumption of the radio wave module 1 as a whole can be suppressed.

  When the main battery 32 is normally attached to the radio module main body 2 when the operating power supply source to each functional block is the sub battery 9, the main battery 32 is normal to the radio module main body 2. Since the power source 61 switches the operating power supply source to each functional block from the sub battery 9 to the main battery 32 using the fact that it is mounted on the battery as a trigger, the consumption of the capacity of the sub battery 9 is minimized. The product life as the radio wave module 1 can be further extended.

  Further, the main battery 32 can be attached to and detached from the radio module main body 2 by the attaching / detaching mechanism having a waterproof structure without the radio module main body 2 being detached from the license plate 4, and the attaching / detaching direction thereof is the number plate 4. Since it is configured to be either upward, lateral, or downward, it is possible to ensure waterproofness at the attachment / detachment location, and to attach / detach from the upward, lateral, or downward direction of the license plate 4. Can do.

  By the way, in the above-described configuration, as shown in FIG. 8, a part of the radio wave module 1 (particularly, the battery side connector 36 and the main body side) with the main battery 32 being normally attached to the radio wave module body 2. A configuration in which the entire portion of the connector 19 is fitted or covered with the cover 71 may be adopted. If comprised in this way, it can avoid beforehand that dirt and a water droplet adhere to the radio wave module 1, and the fitting location of the battery side connector 36 and the main body side connector 19 is not exposed outside. As a result, it is possible to avoid the spontaneous disconnection of the connectors, and it is also possible to avoid the intentional disconnection of the connectors by a third party.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In addition, description is abbreviate | omitted about the same part as above-mentioned 1st Embodiment, and a different part is demonstrated. The first embodiment described above is configured such that the main battery housing portion 33 has an opening above the number plate 4 in a mode in which the radio wave module body 2 is attached to the number plate 4 via the attachment stay 3. Accordingly, the main battery 32 is attached to and detached from the radio module main body 2 from above the license plate 4. On the other hand, in the second embodiment, the radio module main body is provided with an attachment stay. Since the main battery housing part is configured to have an opening on the side of the number plate in a manner attached to the number plate, the main battery is attached to and detached from the radio module main body from the side of the number plate. Is.

  That is, the radio module 81 is configured such that the radio module main body 82 is attached to the license plate 4 via the attachment stay 83, and the radio module main body 82 is attached to the license plate 4 via the attachment stay 83. In the aspect, the main battery housing portion 84 is configured to have an opening on the left side of the license plate 4 from the radio module main body 82 and the mounting stay 83. In this case, the main battery 85 is attached to and detached from the left side of the license plate 4 with respect to the radio module main body 82. The relationship between the main body side connector 86 formed integrally with the radio wave module main body 82 and the battery side connector 87 drawn from the main battery 85 is the same as that of the main body side connector 19 described in the first embodiment. Compared with the relationship with the battery side connector 36, only the fitting directions thereof are different, and the basic structure and the fitting form are the same.

  Also in the second embodiment, the same effects as those described in the first embodiment can be obtained, that is, the main battery 85 is configured to be detachable from the radio module main body 82. When the capacity of the main battery 85 is exhausted, the product life as the radio wave module 81 can be extended by replacing the main battery 85 whose capacity has been exhausted with the main battery 85 having sufficient capacity.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be modified or expanded as follows.
The main battery housing part may be configured to have an opening below the number plate in such a manner that the radio module main body is attached to the number plate via the mounting stay. The structure which can be attached or detached from the downward direction of a plate may be sufficient.

The abnormality detection unit is not limited to the radio wave module main body and is disposed between the housing and the printed circuit board, but may be disposed at another location, and is configured by a contact switch. However, the present invention is not limited to this, and may be composed of switches and sensors having other structures.
The sub battery and the main battery are not limited to non-chargeable (single-use) primary batteries, and may be rechargeable secondary batteries. In that case, especially when the main battery is a secondary battery, the main battery is normally attached to the radio module main body, and the supply source of the operating power to each functional block is switched from the sub battery to the main battery. Later, power may be supplied from the main battery to the sub battery to charge the sub battery.

Functional block diagram showing a first embodiment of the present invention Transverse plan view of radio module main body and mounting stay Front view (a) and cross-sectional plan view (b) showing a state in which the mounting stay is attached to the license plate Front view (a) and cross-sectional plan view (b) showing a mode in which the radio wave module main body is attached to the license plate via an attachment stay Front view (a) and cross-sectional plan view (b) showing a state in which the mounting bolt is sealed in a mode in which the radio module main body is mounted on the license plate via the mounting stay The figure which shows the aspect by which a main battery is mounted | worn with respect to the electromagnetic wave module main body Front view (a) and cross-sectional plan view (b) showing a state in which the main battery is mounted on the radio module main body Front view showing an aspect with a cover attached The figure which shows the 2nd Embodiment of this invention, Comprising: The figure which shows the aspect with which a main battery is mounted | worn with respect to a radio wave module main body.

Explanation of symbols

  In the drawings, 1 is a radio module for an electronic license plate, 2 is a radio module main body, 9 is a sub-battery, 19 is a main body side connector (detachment mechanism), 32 is a main battery, 36 is a battery side connector (detachment mechanism), 51 Is a control unit, 53 is an RF unit, 55 is a non-volatile memory (storage unit), 56 is a wake-up unit, 57 is an abnormality detection unit, 58 is a determination unit, 59 is a low-frequency oscillation unit, and 60 is a volatile memory (storage). Part), 61 is a power source part, 81 is a radio wave module, 82 is a radio wave module body, and 85 is a main battery.

Claims (7)

A control unit that controls the overall operation of the radio wave module, an RF unit that performs communication operation, a storage unit that stores memory information, and an abnormality detection unit that detects whether an abnormality related to security has occurred, For an electronic license plate in which at least the control unit, the RF unit, and the storage unit operate using power supplied from the main battery as operating power in a mode in which the main battery is normally attached to the radio module main body. Radio module,
A wakeup unit that detects whether a condition for starting the control unit is satisfied;
A determination unit that activates the control unit when it is detected that a condition for activating the control unit by determining the detection result of the wake-up unit or the detection result of the abnormality detection unit is satisfied,
A mode in which the main battery is detachably attached to the radio module main body alone, a sub battery is mounted separately from the main battery, and the main battery is not normally attached to the radio module main body Even so, when the operating power is supplied from the sub battery to at least the storage unit and the abnormality detection unit, the memory information stored in the storage unit is retained and an abnormality related to security occurs. It is detected whether the absence is by the abnormality detecting unit, by the operating power from the sub battery to the judging unit is supplied, the detection result of the abnormality detecting unit is characterized Rukoto is determined by the determination unit Radio module for electronic license plates. The radio module for an electronic license plate according to claim 1,
Even when the main battery is not normally attached to the radio module main body, if the abnormality detection unit detects that an abnormality relating to security has occurred, the main battery is stored in the storage unit. A radio module for an electronic license plate, wherein a part or all of the stored memory information is erased. In the radio module for electronic license plates according to claim 1 or 2,
A low-frequency oscillation unit that supplies a low-frequency clock as an operation clock to the determination unit ;
An electronic license plate radio wave characterized in that a low-frequency clock is supplied from the low-frequency oscillation unit to the determination unit triggered by the fact that an abnormality relating to security has been detected by the abnormality detection unit module. In the radio module for electronic license plates according to any one of claims 1 to 3,
A power supply unit that switches the supply source of the operating power to each functional block between the sub battery and the main battery ,
When the main battery is normally attached to the radio module main body when the supply source of the operating power to each functional block is the sub battery, the main battery is normal to the radio module main body. A radio module for an electronic license plate , wherein a source of operating power supplied to each functional block is switched from the sub battery to the main battery by the power supply unit when triggered by being attached to the electronic battery . In the radio module for electronic license plates according to any one of claims 1 to 4,
The main battery can be attached to and detached from the radio module main body by an attaching / detaching mechanism having a waterproof structure without the radio module main body being removed from the license plate, and the attaching / detaching direction thereof is the upward direction of the license plate, A radio module for an electronic license plate, characterized in that it is either in a horizontal direction or in a downward direction . The radio module for an electronic license plate according to any one of claims 1 to 5,
An electronic device characterized in that the main battery and a part of or the whole of the radio module main body can be covered with a cover in a mode in which the main battery is normally attached to the radio module main body. Radio module for license plates. The radio module for an electronic license plate according to any one of claims 1 to 6,
The abnormality detection unit is provided between a casing of the radio module main body and a license plate, and outputs an abnormality detection signal when the casing of the radio module main body is removed. Radio module for plates.

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