JP2020172760A - Smart key apparatus - Google Patents

Abstract

To provide a smart key apparatus capable of simply and easily preventing fraudulent acts such as a relay attack.SOLUTION: A smart key apparatus capable of tolerating a predetermined actions including unlocking a vehicle by transmitting an authentication code unique to the vehicle to the vehicle includes a transmission unit 3 that operates by power supplied from a button battery D and continuously transmits an authentication code, and an operation button portion 4 and a switch portion 8 as cutout operation means of cutting supplying the power to the transmission unit 3 from the button battery D by an operation of an operator.SELECTED DRAWING: Figure 3

Description

The present invention relates to a smart key device capable of allowing a vehicle a predetermined operation including unlocking by communicating an authentication code unique to the vehicle with the vehicle.

Recently, when an authentication code is communicated between the vehicle and the smart key device and the authentication code transmitted from the smart key device and received on the vehicle side is the vehicle-specific authentication code, the door lock is released or the engine Smart key systems that enable operations such as starting are widespread. Conventionally, the smart key device used in such a smart key system is provided with a transmission unit that operates with electric power supplied from a battery, and constantly transmits weak radio waves to continuously transmit an authentication code. It is configured as.

In this way, since the authentication code is continuously transmitted from the smart key device, when the driver carrying the smart key device approaches the vehicle, the vehicle side receives the authentication code and the legitimate authentication code (the vehicle). It is judged whether or not it is a unique authentication code), and only if it is a legitimate authentication code, operations such as unlocking the door lock and starting the engine are allowed, so an unauthorized release of the door lock or engine start by a third party is permitted. Can be prevented.

However, in the above-mentioned smart key device, since the authentication code is continuously transmitted from the smart key device, a third party illegally communicates between the smart key device and the vehicle with a repeater. There was a problem that effective measures could not be taken for the so-called relay attack. In order to avoid such a relay attack, various measures have been studied in the past, but effective measures have not yet been proposed. Since the prior art does not relate to the invention known in the literature, there is no prior art document information to be described.

In this way, in the conventional smart key device, when the legitimate owner is not in use, a third party illegally uses the authentication code that is continuously transmitted to perform a fraudulent act called a relay attack. There is a risk. On the other hand, in order to prevent fraudulent acts such as relay attacks, it is conceivable to encrypt the authentication code transmitted from the smart key device for each transmission, but in that case, a means for decrypting the encrypted authentication code for each reception is possible. There is a problem that it is required separately and the configuration becomes complicated.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a smart key device capable of easily and easily preventing a fraudulent act such as a relay attack.

The invention according to claim 1 is operated by electric power supplied from a battery in a smart key device capable of allowing a predetermined operation including unlocking of the vehicle by transmitting an authentication code unique to the vehicle to the vehicle. It is characterized by including a transmission unit that continuously transmits the authentication code, and a cutoff operation means that cuts off the power supply from the battery to the transmission unit by the operation of the operator.

The invention according to claim 2 is the smart key device according to claim 1, wherein the shutoff operating means supplies electric power from the battery to the transmission unit by turning off the electrical connection between the battery and the transmission unit. It is characterized by blocking.

The invention according to claim 3 allows the smart key device according to claim 1 or 2 to supply electric power to the transmission unit only during a predetermined time from the operation by the shutoff operating means. It is characterized by sending an authentication code.

The invention according to claim 4 is the smart key device according to claim 1, wherein the blocking operation means switches between a contact state and a non-contact state between the electrode of the battery and the contactor of the transmission unit. It is characterized in that the power supply from the battery to the transmission unit is cut off.

The invention according to claim 5 is the smart key device according to claim 4, wherein the shutoff operating means is in the non-contact state by inserting an insulator between the electrode of the battery and the contactor of the transmission unit. It is characterized by.

The invention according to claim 6 comprises a first storage case and a second storage case for housing the transmission unit in the smart key device according to any one of claims 1 to 5, and the first storage case. The blocking operating means is formed in the above, and another operating means for transmitting the authentication code from the transmitting unit is formed in the second accommodating case.

According to the invention of claim 1, a transmission unit that operates by the electric power supplied from the battery and continuously transmits an authentication code, and a cutoff operation means that cuts off the power supply from the battery to the transmission unit by the operation of the operator. Therefore, it is possible to easily and easily prevent fraudulent acts such as relay attacks.

According to the invention of claim 2, since the cutoff operation means cuts off the power supply from the battery to the transmission unit by turning off the electrical connection between the battery and the transmission unit, the power supply from the battery to the transmission unit Can be arbitrarily blocked, and the crime prevention effect can be enhanced while maintaining operability.

According to the invention of claim 3, since the authentication code is transmitted by allowing the power supply to the transmission unit only during the period from the operation by the blocking operation means to the elapse of a predetermined time, the operation for the relay attack countermeasure is forgotten. It is possible to avoid this, and it is possible to more reliably cut off the power supply from the battery to the transmission unit to further enhance the crime prevention effect.

According to the invention of claim 4, the cutoff operation means cuts off the power supply from the battery to the transmission unit by switching between the contact state and the non-contact state between the electrode of the battery and the contactor of the transmission unit. The power supply from the battery to the transmission unit can be physically cut off, and the crime prevention effect can be further enhanced.

According to the invention of claim 5, since the cutoff operation means is put into a non-contact state by inserting an insulator between the electrode of the battery and the contactor of the transmission unit, the power supply from the battery to the transmission unit is insulated. It can be reliably blocked by the body.

According to the invention of claim 6, a first accommodating case and a second accommodating case accommodating the transmitting unit are provided, a blocking operation means is formed in the first accommodating case, and the second accommodating case is authenticated by the transmitting unit. Since another operating means for transmitting the code has been formed, the crime prevention effect against the relay attack can be enhanced by replacing only the first storage case in the existing smart key device.

Three views showing the appearance of the smart key device according to the first embodiment of the present invention. Section II-II sectional view in FIG. Section III-III sectional view in FIG. Two views showing the transmission unit in the smart key device Schematic diagram showing the state of the transmission unit housed in the first storage case of the smart key device before the battery is attached. Schematic diagram showing a transmission unit housed in a second storage case of the smart key device with a battery attached. A perspective view showing a first storage case and components attached to the first storage case in the smart key device. Schematic diagram showing a holding portion, a substrate, etc. attached to the first storage case in the smart key device. An electric circuit showing the electrical wiring in the smart key device Two views showing the appearance of the smart key device according to the second embodiment of the present invention. Cross-sectional view for showing the internal configuration of the smart key device Schematic diagram showing the contact state between the battery electrode and the contact of the transmission unit in the smart key device. Schematic diagram showing a non-contact state between the battery electrode and the contact of the transmission unit in the smart key device. A perspective view showing a first storage case and components attached to the first storage case in the smart key device. Perspective view showing battery holding parts in the smart key device

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The smart key device 1 according to the first embodiment can allow a predetermined operation including unlocking of the vehicle by transmitting an authentication code unique to the vehicle to the vehicle, and is shown in FIGS. 1 to 9. As described above, the case 2 having the first storage case 2a and the second storage case 2b, the button battery D, the transmission unit 3, the operation button portion 4 formed in the first storage case 2a, and the substrate 7 are formed. It is configured to include a switch unit 8 (blocking operation means), an operation button unit 5 formed in the second storage case 2b, an extension adapter 6, and a substrate 7.

The case 2 is assembled by matching the half-shaped first storage case 2a and the second storage case 2b, and a storage space for accommodating the transmission unit 3 is formed inside. Further, in the present embodiment, the operation button unit 4 and the switch unit 8 constituting the blocking operation means are formed in the first accommodation case 2a, and the second accommodation case 2b is made to transmit the authentication code from the transmission unit 3. A plurality of operation button portions 5 are formed as the operation means of the above.

The transmission unit 3 is operated by the electric power supplied from the button battery D and continuously transmits an authentication code. As shown in FIG. 4, the transmission unit 3 has a transmission unit 3a and a unit unit 3b. It is configured. The unit portion 3b is composed of a rectangular member housed in the second storage case 2b, and a switch a that can be pressed by operating the operation button portion 5 is formed on one surface, and the battery D is mounted on the other surface. A holding portion H having a concave shape that can be held (holding the extension adapter 6 in this embodiment) is formed.

The holding portion H is formed with a positive contact h1a that can contact the positive electrode formed on the side surface of the extension adapter 6 and a negative contact h1b that can contact the negative electrode formed on the bottom surface of the extension adapter 6. Has been done. Then, when the extension adapter 6 is held in the holding unit H, the button battery D and the transmitting unit 3a are electrically connected via the extension adapter 6, and power is supplied to the transmitting unit 3a. The extension adapter 6 has substantially the same dimensions and shape as the button battery D. For example, even if the holding unit H holds the button battery D, the button battery D and the transmitting unit 3a are electrically connected. Then, power is supplied to the transmitting unit 3a.

The transmitter 3a is for transmitting an authentication code unique to the vehicle to the vehicle, and is an authentication code (specifically, a high-frequency signal) composed of weak radio waves in a state where power is supplied from the button battery D. Can be transmitted continuously (always in the power supply state). Then, when the vehicle receives the authentication code, it is determined whether or not the authentication code is a legitimate authentication code, and the vehicle is unlocked (door unlocking, etc.) on condition that it is determined to be a legitimate authentication code. ), A predetermined operation (for example, an operation such as starting an engine) can be tolerated.

Further, when the switch a is pressed by operating an arbitrary operation button unit 5 in a state where it is determined that the vehicle has received a legitimate authentication code, a predetermined signal is transmitted from the transmitting unit 3a to the vehicle. Is transmitted, and for example, the door lock is released and the trunk is opened and closed by remote control. In the present embodiment, the second storage case 2b is formed with two operation button portions 5, but a single or three or more operation button portions 5 are formed, or the operation button portion 5 is used. It may not be present.

Here, in the first storage case 2a of the smart key device 1 according to the present embodiment, an operation button that cuts off the power supply from the button battery D to the transmission unit 3 (specifically, the transmission unit 3a) by the operation of the operator. Electrically, the unit 4 and the switch unit 8 (blocking operation means), the holding unit S for holding the button battery D, and the extension adapter 6 held by the button battery D and the holding unit H held by the holding unit S. It includes a substrate 7 on which a connectable electric circuit is formed.

As shown in FIGS. 7 and 8, the holding portion S is formed at a predetermined portion of the first storage case 2a, and has a positive electrode formed on the side surface of the button battery D while holding the button battery D. A contactable positive contact h2a and a contactable negative contact h2b with a negative electrode formed on the bottom surface of the button battery D are formed. Then, when the button battery D is held in the holding portion S, the positive electrode and the negative electrode of the button battery D are formed on the substrate 7 via the positive contact h2a and the negative contact h2b, and further, the conductive member m1 and the conductive member m2. It is designed to be connected to an electric circuit.

As described above, the operation button unit 4 is formed in the first storage case 2a so that the operator can arbitrarily perform a pressing operation and can operate the switch unit 8 in accordance with the pressing operation. Has been done. That is, the switch unit 8 on the board 7 can be operated by operating the operation button unit 4. The operation button unit 4 is composed of a so-called boot-shaped operation button made of a silicon cover or the like, and has functions for waterproofing and dustproofing.

The switch unit 8 operates in response to the pressing operation of the operation button unit 4 to turn on / off the electrical connection between the button battery D and the transmission unit 3, and is attached to a predetermined position on the substrate 7. .. In such a substrate 7, a predetermined electric circuit is printed and formed, and terminals 7a and 7b (see FIG. 8) are formed at the ends of the electric circuit, so that the first accommodating case 2a and the second accommodating case 2b are formed. In the assembled state, the extension adapter 6 held by the holding portion H and the electric circuit formed on the substrate 7 are electrically connected to each other.

As a result, in a normal state, the button battery D constantly supplies power to the transmission unit 3 (specifically, the transmission unit 3a) via the electric circuit of the substrate 7 and the extension adapter 6, and operates the operation button unit 4. Then, when the switch unit 8 is pressed, the electrical connection between the button battery D and the transmission unit 3 can be turned off, and the power supply from the button battery D to the transmission unit 3 is cut off.

According to the smart key device 1 according to the present embodiment, the transmission unit 3 that operates by the electric power supplied from the button battery D and continuously transmits the authentication code, and the transmission unit 3 from the button battery D by the operation of the operator. Since it is provided with a shutoff operation means (operation button section 4 and switch section 8) for shutting off the power supply to the battery, it is possible to easily and easily prevent a fraudulent act such as a relay attack.

Further, the shutoff operation means (operation button unit 4 and switch unit 8) according to the present embodiment is connected to the transmission unit 3 from the button battery D by turning off the electrical connection between the button battery D and the transmission unit 3. Since the power supply is cut off, the power supply from the button battery D to the transmission unit 3 can be arbitrarily cut off, and the crime prevention effect can be enhanced while maintaining the operability.

Further, a first accommodating case 2a and a second accommodating case 2b for accommodating the transmission unit 3 are provided, and a shutoff operation means (operation button portion 4 and switch portion 8) is formed in the first accommodating case 2a, and a second accommodating case 2a is provided. Since another operation means (operation button unit 5) for transmitting an authentication code from the transmission unit 3 (transmission unit 3a) is formed in the storage case 2b, only the first storage case 2a in the existing smart key device 1 is replaced. This makes it possible to enhance the crime prevention effect against relay attacks.

Further, as the substrate 7 according to another embodiment, as shown in FIG. 9, a predetermined electric circuit is printed and formed, and in addition to the switch portion 8, the timed function portion 9 is formed. Good. When the switch unit 8 turns on the electrical connection, the timed function unit 9 maintains the electrically turned-on state for a predetermined time, and automatically turns off the electrical connection when the predetermined time elapses. The timed function unit 9 may be a desired electric circuit component for the timed function, or may be a microcomputer or the like that fulfills the timed function.

That is, it is possible to allow the power supply to the transmission unit 3 and transmit the authentication code only during the period from the operation by the operation button unit 4 and the switch unit 8 (blocking operation means) to the elapse of a predetermined time. As a result, it is possible to avoid forgetting the operation for the relay attack countermeasure, and it is possible to more reliably cut off the power supply from the button battery D to the transmission unit 3 to further enhance the crime prevention effect.

Next, a second embodiment according to the present invention will be described.
Similar to the first embodiment, the smart key device 1'according to the present embodiment can allow a predetermined operation including unlocking of the vehicle by transmitting an authentication code unique to the vehicle to the vehicle. , As shown in FIGS. 10 to 15, a case 2 having a first storage case 2a and a second storage case 2b, a button battery D, a transmission unit 3, an operation dial 10 formed in the first storage case 2a, and It is configured to include an insulator 11 (blocking operation means) and a holding component R. The same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

Similar to the first embodiment, the case 2 is assembled by matching the half-shaped first storage case 2a and the second storage case 2b, and a storage space for accommodating the transmission unit 3 is formed inside. ing. In the present embodiment, the operation dial 10 constituting the blocking operation means is formed in the first accommodation case 2a, and the authentication code is transmitted from the transmission unit 3 to the second accommodation case 2b, although not shown. A plurality of operation button units 5 (see the first embodiment) are formed as other operation means for transmitting a transmission.

Further, as shown in FIGS. 10, 11 and 14, the first storage case 2a according to the present embodiment is attached with an operation dial 10 capable of rotating around the shaft portion L, and is a part of the operation dial 10. An arm portion 10a for connecting to and rotating the insulator 11 is formed so as to project. As a result, when the operation dial 10 is arbitrarily rotated, the insulator 11 connected to the arm portion 10a is rotated and rotated.

Similar to the first embodiment, the transmission unit 3 is operated by the electric power supplied from the button battery D to continuously transmit the authentication code, and as shown in FIGS. 12 and 13, the transmission unit 3a And a unit portion 3b. As shown in the figure, the unit portion 3b according to the present embodiment is formed with a holding component R for holding the button battery D, and the holding component R is a plus formed on the side surface of the button battery D. A positive contact h1a that can contact the electrode and a negative contact h1b that can contact the negative electrode formed on the bottom surface of the button battery D are formed.

Further, as shown in FIG. 15, the holding component R urges the insulator 11, the pressing portion 12 that can come into contact with the side surface of the button battery D, and the pressing portion 12, and attaches the button battery D to the positive connector h1a side. It is configured to have a spring 13 that presses toward. The insulator 11 is made of an arc-shaped material capable of being electrically insulated, and has an insertion hole 10a formed at its base end portion through which an arm portion 10a can be inserted and connected to an operation dial 10.

Then, when the operation dial 10 is rotated, the insulator 11 rotates along the circular shape of the edge of the holding component R, and as shown in FIG. 13, the button battery D and the contactor (in the present embodiment). Is adapted to insert an insulator 11 between the positive electrode of the button battery D and the positive contact h1a). As a result, by rotating the operation dial 10, the contact state (in this embodiment, the positive electrode of the button battery D and the positive contact h1a) between the electrode of the button battery D and the contactor of the transmission unit 3 (in this embodiment). Since it is possible to switch from the non-contact state (see FIG. 13) to the non-contact state (see FIG. 13), the power supply from the button battery D to the transmission unit 3 can be cut off by the operation of the operator.

Further, in the process of inserting the insulator 11 between the button battery D and the contactor, the button battery D moves in the holding component R against the urging force of the spring 13. As a result, when the operation dial 10 is rotated in the direction opposite to the power supply cutoff operation direction, the insulator 11 is rotated and moved, and as shown in FIG. 12, the electrode of the button battery D and the transmission unit 3 While retracting from between the contacts (the positive electrode of the button battery D and the positive contact h1a in the present embodiment), the button battery D is moved by the urging force of the spring 13, and the electrode of the button battery D and the transmission unit. The contact state (see FIG. 12) can be switched between the contact of 3 (in this embodiment, the positive electrode of the button battery D and the positive contact h1a).

According to the smart key device 1'according to the present embodiment, the transmission unit 3 that operates by the electric power supplied from the button battery D and continuously transmits the authentication code, and the transmission unit from the button battery D by the operation of the operator. Since the shutoff operation means (operation dial 10 and insulator 11) for shutting off the power supply to the third unit is provided, it is possible to easily and easily prevent fraudulent acts such as relay attacks.

Further, the blocking operation means (operation dial 10 and insulator 11) according to the present embodiment switches the contact state between the electrode of the button battery D and the contactor of the transmission unit 3 from the contact state to the non-contact state. Since the power supply from the D to the transmission unit 3 is cut off, the power supply from the button battery 3 to the transmission unit 3 can be physically cut off, and the crime prevention effect can be further enhanced.

In the present embodiment, the positive electrode of the button battery D and the positive contact h1a are switched from the contact state to the non-contact state by the blocking operation means (operation dial 10 and insulator 11), but instead of this. Or together with this, an insulator is inserted between the negative electrode of the button battery D and the positive contact h1b by the shutoff operation means (operation dial 10 and insulator 11) to switch from the contact state to the non-contact state. You may.

Further, the blocking operation means (operation dial 10 and insulator 11) according to the present embodiment is brought into a non-contact state by inserting the insulator 11 between the electrode of the button battery D and the contactor of the transmission unit 3. Therefore, the power supply from the button battery D to the transmission unit 3 can be reliably cut off by the insulator. In the present embodiment, the insulator 11 is inserted between the electrode of the button battery D and the contactor of the transmission unit 3 to make a non-contact state, but the electrode of the button battery D and the transmitter unit 3 are in contact with each other. A non-contact state may be provided by providing a gap between the child and the child.

Although the present embodiment has been described above, the present invention is not limited to this, and for example, instead of the button battery D, a battery of another form (AA battery, AAA battery, rechargeable secondary battery, etc.) ) May be used, and the cutoff operation means may be another form of operation means as long as the power supply from the battery such as a button battery to the transmission unit 3 is cut off by the operation of the operator. Further, the applicable vehicle is not limited to an automobile, and may be a vehicle of another form.

If it is a smart key device equipped with a transmission unit that operates by the power supplied from the battery and continuously transmits an authentication code, and a cutoff operation means that cuts off the power supply from the battery to the transmission unit by the operation of the operator. , The appearance shape may be different, or other functions may be added.

1, 1'Smart key device 2 Case 2a 1st storage case 2b 2nd storage case 3 Transmission unit 3a Transmission unit 3b Unit unit 4 Operation button unit (blocking operation means)
5 Operation button part 6 Extension adapter 7 Board 8 Switch part (blocking operation means)
9 Timed function unit 10 Operation dial (blocking operation means)
10a Arm part 11 Insulator (blocking operation means)
12 Pressing part 13 Spring D Button cell R Holding part H Holding part S Holding part L Rotating shaft h1a Positive contact h1b Negative contact h2a Positive contact h2b Negative contact

Claims (6)

In a smart key device that can allow a predetermined operation including unlocking a vehicle by transmitting a vehicle-specific authentication code to the vehicle.
A transmission unit that operates on the power supplied from the battery and continuously transmits the authentication code,
A shutoff operation means for shutting off the power supply from the battery to the transmitter unit by the operation of the operator.
A smart key device characterized by being equipped with. The smart key device according to claim 1, wherein the cutoff operation means cuts off the power supply from the battery to the transmission unit by turning off the electrical connection between the battery and the transmission unit. The smart key device according to claim 1 or 2, wherein power is allowed to be supplied to the transmission unit and the authentication code is transmitted only during the period from the operation by the shutoff operation means to the elapse of a predetermined time. .. The blocking operation means is characterized in that the power supply from the battery to the transmitting unit is cut off by switching between the electrode of the battery and the contactor of the transmitting unit from a contact state to a non-contact state. 1. The smart key device according to 1. The smart key device according to claim 4, wherein the shutoff operating means is brought into the non-contact state by inserting an insulator between the electrode of the battery and the contactor of the transmission unit. A first accommodating case and a second accommodating case accommodating the transmitting unit are provided, the blocking operation means is formed in the first accommodating case, and the authentication code is transmitted from the transmitting unit to the second accommodating case. The smart key device according to any one of claims 1 to 5, wherein another operating means is formed.

Images