JP7157968B2 - smart key device - Google Patents

Description

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

In recent years, when an authentication code is exchanged between a vehicle and a smart key device, and the authentication code transmitted from the smart key device and received by the vehicle is an authentication code unique to the vehicle, it is possible to unlock the doors, unlock the engine, and so on. A smart key system that enables operations such as starting is widespread. A smart key device used in such a smart key system conventionally has a transmission unit that operates on power supplied from a battery, and continuously transmits weak radio waves to continuously transmit an authentication code. is configured as follows.

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 receives the authentication code and the valid authentication code (that vehicle) is received. unique authentication code), and only if it is a legitimate authentication code, operations such as unlocking the doors and starting the engine are permitted. can be prevented.

However, in the smart key device as described above, since the authentication code is continuously transmitted from the smart key device, a third party may illegally use the repeater to communicate between the smart key device and the vehicle. However, there is a problem that effective countermeasures cannot be taken against so-called relay attacks. In order to avoid such a relay attack, conventionally, various countermeasures have been studied, but no effective countermeasure has been proposed yet. Since this prior art does not relate to inventions publicly 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 authorized owner does not use it, a third party illegally uses the continuously transmitted authentication code to carry out a fraudulent act called a relay attack. There is fear. On the other hand, in order to prevent fraudulent acts such as relay attacks, it is conceivable to encrypt the authentication code sent from the smart key device each time it is sent, but in that case, there is no means to decrypt the encrypted authentication code each time it is received. There is a problem that the configuration becomes complicated because it is required separately.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a smart key device capable of simply and easily preventing a fraudulent act such as a relay attack.

According to the first aspect of the present invention, there is provided a smart key device capable of permitting a predetermined operation including unlocking of a vehicle by transmitting an authentication code unique to the vehicle to the vehicle. a transmission unit for continuously transmitting the authentication code; a cutoff operation means for shutting off power supply from the battery to the transmission unit by an operator's operation ; a first housing case and a second housing for housing the transmission unit; a case , wherein the blocking operation means is formed in the first housing case, and the transmission unit and other operation means for transmitting the authentication code from the transmission unit are formed in the second housing case; It is characterized in that the first housing case is replaceable .

The invention according to claim 2 is the smart key device according to claim 1, wherein the cut-off operation means turns off electrical connection between the battery and the transmission unit to supply power from the battery to the transmission unit. characterized by blocking the

The invention according to claim 3 is the smart key device according to claim 1 or claim 2, wherein power supply to the transmission unit is allowed only until a predetermined time has elapsed since the operation by the cut-off operation means. It is characterized by transmitting an authentication code.

According to a fourth aspect of the present invention, there is provided the smart key device of the first aspect, wherein the cut-off operation means switches the contact state between the electrode of the battery and the contactor of the transmission unit from a contact state to a non-contact state. It is characterized by cutting off power supply from a battery to the transmitting unit.

The invention according to claim 5 is the smart key device according to claim 4, wherein the cut-off operation means inserts an insulator between the electrode of the battery and the contactor of the transmission unit to set the non-contact state. It is characterized by

According to the first aspect of the invention, the transmitting unit is operated by the power supplied from the battery and continuously transmits the authentication code, and the cut-off operation means for cutting off the power supply from the battery to the transmitting unit by the operator's operation. is provided, it is possible to simply and easily prevent a fraudulent act such as a relay attack.
Further, it comprises a first housing case and a second housing case for housing the transmitting unit, the first housing case is provided with a blocking operation means, and the second housing case is caused to transmit the transmitting unit and the authentication code from the transmitting unit. Since another operating means is formed, it is possible to improve the crime prevention effect against relay attacks by replacing only the first housing case in the existing smart key device.

According to the invention of claim 2, the cut-off 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. can be arbitrarily blocked, and the crime prevention effect can be enhanced while maintaining operability.

According to the invention of claim 3, since the power supply to the transmission unit is permitted and the authentication code is transmitted only during the predetermined time after the operation by the cut-off operation means, operation for countermeasure against relay attack is forgotten. The power supply from the battery to the transmission unit can be cut off more reliably, thereby further enhancing the crime prevention effect.

According to the fourth aspect of the invention, the cut-off operation means cuts off the power supply from the battery to the transmission unit by switching the contact state between the electrode of the battery and the contactor of the transmission unit from the contact state to the non-contact state. It is possible to physically cut off the power supply from the battery to the transmission unit, thereby further enhancing the crime prevention effect.

According to the fifth aspect of the present invention, the cut-off operation means inserts an insulator between the electrode of the battery and the contactor of the transmission unit to bring it into a non-contact state, thereby insulating power supply from the battery to the transmission unit. It can be reliably blocked by the body.

FIG. 3 is a three-sided view showing the appearance of the smart key device according to the first embodiment of the present invention; II-II line sectional view in FIG. III-III line sectional view in FIG. A two-sided view showing a transmission unit in the same smart key device Schematic diagram showing a state of the transmission unit housed in the first housing case in the smart key device before the battery is attached. Schematic diagram showing a state in which a battery is attached to the transmission unit housed in the second housing case 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. Schematic diagram showing a holding part, a substrate, etc. attached to the first housing case in the same smart key device An electric circuit showing the electric wiring in the same smart key device A two-sided view showing the appearance of a smart key device according to a second embodiment of the present invention. Sectional view for showing the internal configuration of the smart key device Schematic diagram showing the state of contact between the electrode of the battery and the contactor of the transmission unit in the same smart key device. Schematic diagram showing a non-contact state between the electrode of the battery and the contactor 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. A perspective view showing a battery holding component 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 permit predetermined operations including unlocking of the vehicle by transmitting an authentication code unique to the vehicle to the vehicle. , a case 2 having a first accommodation case 2a and a second accommodation case 2b, a button battery D, a transmission unit 3, an operation button portion 4 formed in the first accommodation case 2a, and a substrate 7 formed It comprises a switch portion 8 (interruption operation means), an operation button portion 5 formed in the second housing case 2b, an extension adapter 6, and a substrate 7. As shown in FIG.

The case 2 is formed by assembling a half-split first housing case 2a and a second housing case 2b together, and a housing space for housing the transmission unit 3 is formed therein. In addition, in the present embodiment, the operation button portion 4 and the switch portion 8 constituting the blocking operation means are formed in the first containing case 2a, and the second containing case 2b is made to transmit the authentication code from the transmitting unit 3. A plurality of operation button portions 5 are formed as operating means.

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

The holding portion H has 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. It is When the extension adapter 6 is held in the holding portion H, the button battery D and the transmission portion 3a are electrically connected via the extension adapter 6, and power is supplied to the transmission portion 3a. The extension adapter 6 has substantially the same size and shape as the button battery D. For example, even if the button battery D is held in the holding part H, the button battery D and the transmitting part 3a are electrically connected. and power is supplied to the transmission unit 3a.

The transmission unit 3a is for transmitting an authentication code unique to the vehicle to the vehicle, and in a state in which power is supplied from the button battery D, an authentication code (specifically, a high-frequency signal) composed of weak radio waves. 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 valid authentication code. ) (for example, an operation such as starting the engine).

Further, in a state where it is determined that the vehicle has received a valid authentication code, when the switch a is pressed by operating an arbitrary operation button portion 5, a predetermined signal is sent from the transmitting portion 3a to the vehicle. is sent and, for example, unlocking the door or opening/closing the trunk can be performed by remote control. In this embodiment, two operation button portions 5 are formed in the second housing case 2b, but a single operation button portion 5 or three or more operation button portions 5 are formed, or the operation button portion 5 is not provided. It may not have.

Here, in the first storage case 2a of the smart key device 1 according to the present embodiment, an operation button for interrupting the power supply from the button battery D to the transmission unit 3 (specifically, the transmission section 3a) is operated by the operator. The portion 4 and the switch portion 8 (interrupting operation means), the holding portion S holding the button battery D, the button battery D held by the holding portion S, and the extension adapter 6 held by the holding portion H are electrically connected. and 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 housing case 2a. A contactable positive contact h2a and a negative electrode formed on the bottom surface of the button battery D and a negative contact h2b contactable 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 the conductive members m1 and m2. It is intended to be connected to an electrical circuit.

The operation button portion 4 is formed in the first housing case 2a, as described above, and can be arbitrarily pressed by the operator, and can operate the switch portion 8 in accordance with the pressing operation. It is That is, by operating the operation button portion 4, the switch portion 8 on the substrate 7 can be operated. The operation button section 4 is a so-called boot-shaped operation button made of a silicon cover or the like, and has functions for waterproofing and dustproofing.

The switch section 8 is mounted at a predetermined position on the substrate 7 and operates in accordance with the pressing operation of the operation button section 4 to turn on/off the electrical connection between the button battery D and the transmission unit 3 . . A predetermined electric circuit is printed on the substrate 7, and terminals 7a and 7b (see FIG. 8) are formed at the ends of the electric circuit. 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.

As a result, during normal operation, the button battery D constantly supplies power to the transmission unit 3 (specifically, the transmission section 3a) through the electric circuit of the substrate 7 and the extension adapter 6, and operates the operation button section 4. Then, when the switch portion 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 is operated by the power supplied from the button battery D and continuously transmits the authentication code, and the transmission unit 3 is operated by the button battery D by the operator's operation. Since the cutoff operation means (the operation button portion 4 and the switch portion 8) for cutting off the power supply to the device is provided, it is possible to simply and easily prevent a fraudulent act such as a relay attack.

In addition, the cut-off operation means (the operation button portion 4 and the switch portion 8) according to the present embodiment turns off the electrical connection between the button battery D and the transmission unit 3, thereby causing the button battery D to transmit power to the transmission unit 3. Since the power supply is interrupted, the power supply from the button battery D to the transmission unit 3 can be arbitrarily interrupted, and the crime prevention effect can be enhanced while maintaining the operability.

Further, it comprises a first housing case 2a and a second housing case 2b for housing the transmission unit 3, and the first housing case 2a is formed with a cut-off operation means (an operation button portion 4 and a switch portion 8), and a second housing case 2a. Since another operation means (operation button portion 5) for transmitting an authentication code from the transmission unit 3 (transmitting portion 3a) is formed in the housing case 2b, only the first housing case 2a in the existing smart key device 1 is replaced. Thus, the crime prevention effect against relay attacks can be enhanced.

Furthermore, 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 section 8, the time limit function section 9 may be formed. good. When the switch section 8 turns on the electrical connection, the time limit function section 9 maintains the electrical on state for a predetermined period of time, and automatically turns off the electrical connection after the predetermined period of time has elapsed. Note that the time limit function unit 9 may be a desired electric circuit component for the time limit function, or may be a microcomputer or the like that performs the time limit function.

That is, it is possible to allow the power supply to the transmission unit 3 and transmit the authentication code only during a predetermined period of time from the operation of the operation button portion 4 and the switch portion 8 (shutoff operation means). As a result, it is possible to avoid forgetting the operation for countermeasures against relay attacks, and the power supply from the button battery D to the transmission unit 3 can be cut off more reliably, thereby further enhancing the crime prevention effect.

Next, a second embodiment of the invention will be described.
As in the first embodiment, the smart key device 1' according to this embodiment can permit predetermined operations 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 housing case 2a and a second housing case 2b, a button battery D, a transmission unit 3, an operation dial 10 formed in the first housing case 2a, and It is composed of an insulator 11 (interrupting operation means) and a holding part R. As shown in FIG. Parts similar to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

As in the first embodiment, the case 2 is formed by assembling a half-split first housing case 2a and a second housing case 2b together, and a housing space for housing the transmission unit 3 is formed therein. ing. In the present embodiment, the operation dial 10 constituting the blocking operation means is formed in the first housing case 2a, and the authentication code is transmitted from the transmitting unit 3 to the second housing case 2b (not shown). A plurality of operation button portions 5 (see the first embodiment) are formed as other operation means for transmitting.

Furthermore, as shown in FIGS. 10, 11, and 14, the first housing case 2a according to the present embodiment has an operation dial 10 that can be rotated about the shaft portion L, and a part of the operation dial 10. An arm portion 10a for connecting with the insulator 11 and rotating is formed protruding therefrom. As a result, when the operation dial 10 is arbitrarily rotated, the insulator 11 connected to the arm portion 10a is rotated along with it to be rotatable.

As in the first embodiment, the transmission unit 3 is operated by power supplied from the button battery D and is for continuously transmitting the authentication code. 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 formed on the side surface of the button battery D. A positive contact h1a contactable with an electrode and a negative contact h1b contactable with a negative electrode formed on the bottom surface of the button battery D are formed.

Further, as shown in FIG. 15, the holding part R includes an insulator 11, a pressing portion 12 that can come into contact with the side surface of the button battery D, and a pressing portion 12 that biases the button battery D toward the positive connector h1a. and a spring 13 that presses toward. The insulator 11 is made of an arc-shaped material capable of electrical insulation, and has an insertion hole 10a formed at its proximal end through which the arm portion 10a can be inserted and connected to the operation dial 10. As shown in FIG.

When the operation dial 10 is rotated, the insulator 11 rotates along the circular shape of the edge of the holding part R. As shown in FIG. is designed to interpose 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 ( 12) 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 operator's operation.

Further, the button battery D moves within the holding part R against the biasing force of the spring 13 during the process of inserting the insulator 11 between the button battery D and the contact. As a result, when the operation dial 10 is rotated in the direction opposite to the direction of operation for cutting off the power supply, the insulator 11 is rotated and moved, and as shown in FIG. Withdrawal from between the contact (in this embodiment, the positive electrode of the button battery D and the positive contact h1a), the button battery D is moved by the biasing force of the spring 13, and the electrode of the button battery D and the transmission unit 3 contacts (in this embodiment, the positive electrode of the button battery D and the positive contact h1a) can be switched to the contact state (see FIG. 12).

According to the smart key device 1' according to the present embodiment, the transmission unit 3, which is operated by the 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. 3, it is possible to simply and easily prevent a fraudulent act such as a relay attack.

In addition, the disconnecting operation means (the operation dial 10 and the insulator 11) according to the present embodiment switches the electrode of the button battery D and the contactor of the transmission unit 3 from a contact state to a non-contact state to switch the button battery. Since the power supply from 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 this 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 disconnecting operation means (the operation dial 10 and the insulator 11). Alternatively, along with this, an insulator is inserted between the negative electrode of the button battery D and the positive contact h1b by the disconnecting operation means (operating dial 10 and insulator 11) to switch from the contact state to the non-contact state. may

Furthermore, the cut-off 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 this embodiment, the insulator 11 is inserted between the electrode of the button battery D and the contactor of the transmission unit 3 to provide a non-contact state. A non-contact state may be established by providing a gap between the element and the element.

Although the present embodiment has been described above, the present invention is not limited to this. ), and the cutoff operation means may be any other form of operation means as long as it cuts off the power supply to the transmission unit 3 from a battery such as a button battery by an operator's operation. Moreover, the applicable vehicle is not limited to an automobile, and may be another type of vehicle.

A transmission unit operated by power supplied from a battery to continuously transmit an authentication code, a cut-off operation means for shutting off the power supply from the battery to the transmission unit by an operator's operation, and a first housing containing the transmission unit. a case and a second housing case , wherein the first housing case is formed with a blocking operation means, and the second housing case is formed with a transmission unit and other operation means for causing the transmission unit to transmit an authentication code; As long as it is a smart key device in which one storage case is replaceable, it may have a different external shape or may have other functions added.

1, 1' smart key device 2 case 2a first housing case 2b second housing case 3 transmission unit 3a transmission section 3b unit section 4 operation button section (shutoff operation means)
5 Operation button section 6 Extension adapter 7 Board 8 Switch section (interruption operation means)
9 Time limit function unit 10 Operation dial (interruption operation means)
10a arm portion 11 insulator (interruption operation means)
12 pressing portion 13 spring D button battery R holding part H holding portion S holding portion L rotating shaft h1a positive contact h1b negative contact h2a positive contact h2b negative contact

Claims (6)

A smart key device capable of permitting a predetermined operation including unlocking of a vehicle by transmitting an authentication code unique to the vehicle to the vehicle,
a transmission unit operated by power supplied from a battery and continuously transmitting the authentication code;
cut-off operation means for cutting off power supply from the battery to the transmission unit by an operator's operation;
a first housing case and a second housing case that house the transmitting unit;
wherein the blocking operation means is formed in the first housing case, and the transmission unit and other operation means for transmitting the authentication code from the transmission unit are formed in the second housing case, and 1. A smart key device characterized in that one storage case is replaceable. 2. The smart key device according to claim 1, wherein the cut-off 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. 3. The smart key device according to claim 1, wherein the power supply to the transmission unit is allowed to transmit the authentication code only until a predetermined time elapses from the operation by the cut-off operation means. . 3. The cut-off operation means cuts off the power supply from the battery to the transmission unit by switching the contact between the electrode of the battery and the contactor of the transmission unit from a contact state to a non-contact state. 2. The smart key device according to 1. 5. The smart key device according to claim 4, wherein said cut-off operation means is brought into said non-contact state by inserting an insulator between the electrode of said battery and the contactor of said transmission unit. 2. The second storage case according to claim 1 , wherein a holding portion capable of holding the battery is formed, and an extension adapter electrically connected to the battery is attached to the holding portion. smart key device.

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