JP2012021318A - Electronic key system and vehicle side device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic key system and a vehicle-side system that can recognize a possibility that a vehicle is under a relay attack, while preventing a short service life of a built-in battery of a portable machine.SOLUTION: A vehicle-side device 100 determines whether a portable machine 200 is located outside a communicable range of the vehicle-side device 100 or inside the communicable range based on whether an answer signal can be received by a UHF reception section 103 or not. Based on a fact that the portable machine 200 has changed from a state in which the portable machine 200 is located outside the communicable range of the vehicle-side device 100 to a state in which the portable machine 200 is located inside the communicable range of the vehicle-side device 100, the vehicle-side device 100 gives a notification to the effect to a mobile phone 300 through a public line communication section 104, and the mobile phone 300 announces the notification with a speaker 303 and an indicator 304.

Description

  The present invention controls a vehicle using wireless communication between a portable device carried by a user and a vehicle-side device mounted on the vehicle, and from the vehicle-side device to a public line terminal carried by the user. The present invention relates to an electronic key system that performs notification using wireless communication via a public line and a vehicle-side device that constitutes the electronic key system.

  A so-called smart key system is known that controls a vehicle using wireless communication between a portable device carried by a user and a vehicle-side device mounted on the vehicle. In this smart key system, normally, for example, when unlocking a vehicle door, the portable device needs to be positioned close to the vehicle-side device.

  However, by placing a repeater between the portable device and the vehicle-side device that can relay the request signal transmitted from the vehicle-side device and the answer signal transmitted from the portable device, the portable device is far away from the vehicle. Even in such a position, the portable device and the vehicle-side device can perform wireless communication with each other. A technique for performing wireless communication between the portable device and the vehicle-side device through the relay device in this manner is generally called a relay attack.

  When a relay attack is received, even if the portable device is located at a position away from the vehicle side device, code verification is performed using wireless communication between the portable device and the vehicle side device. A third party who is not a user can unlock the vehicle door. As a result, the vehicle may be stolen.

  In order to prevent the vehicle from being stolen by such a relay attack, for example, a technique described in Patent Document 1 is known.

  In the technology described in Patent Document 1, the vehicle-side device has a plurality of transmission antennas at different positions of the vehicle on which the vehicle-side device is mounted, and the portable device has a plurality of reception antennas that are respectively directed to different axes. have. And a portable machine detects each intensity | strength in a some receiving antenna about the request signal transmitted from the some transmitting antenna, respectively, and compares the intensity ratio in the receiving antenna of these request signals.

  When the request signal transmitted from the vehicle side device is received, the intensity ratio of the request signal at the receiving antenna is different. On the other hand, when the request signal is relayed through the repeater, that is, when a relay attack is received, the request signal is received. The intensity ratio in the antenna is the same. Therefore, the portable device can determine whether or not the portable device has received the request signal by the relay attack using the intensity ratio of the request signal at the receiving antenna. When the portable device determines that the request signal has been received by the relay attack, the portable device does not transmit an answer signal to the vehicle side device. Thereby, since code verification by wireless communication between the portable device and the vehicle-side device is not established, the vehicle-side device does not unlock the vehicle door, and thus can prevent the vehicle from being stolen. . In addition, when the portable device determines that the request signal has been received by the relay attack, the portable device notifies that fact. As a result, the user can be notified that the vehicle is receiving a relay attack.

JP 2006-342545 A

  By the way, in the technique described in Patent Document 1, when determining whether or not the vehicle is subjected to a relay attack, the portable device detects the respective strengths of request signals at a plurality of reception antennas, and these request signals. It is necessary to compare the intensity ratios at the receiving antennas. This complicates the mechanical and electrical structure of the portable device, increases the computational load on the portable device, and shortens the life of the built-in battery of the portable device.

  The present invention has been made in view of the above circumstances, and its purpose is that a user may receive a relay attack while reducing the shortening of the life of a built-in battery of a portable device. It is an object to provide an electronic key system and a vehicle-side system that can notify the vehicle.

  In order to achieve such an object, according to the first aspect of the present invention, the vehicle is controlled using wireless communication between the portable device carried by the user and the vehicle-side device mounted on the vehicle. An electronic key system for notifying a public line terminal carried by a user from a device via a public line, wherein the vehicle side device transmits a request signal for requesting the portable device to transmit an answer signal. A vehicle-side transmission unit, a vehicle-side reception unit that receives an answer signal, a vehicle-side public line communication unit that transmits information to a public line terminal carried by a user via a public line, and a vehicle-side reception unit Based on whether the answer signal can be received or not, it is determined whether the portable device is in a state where the portable device is located outside the communicable range with the vehicle-side device or in a communicable range. Is changed from a state located outside the communicable range with the vehicle side device to a state located within the communicable range with the vehicle side device. Vehicle side judgment control unit that transmits the notification of, the public line terminal is received by the terminal side public line communication unit that receives the notification via the public line, and the terminal side public line communication unit, A terminal-side notification unit that notifies a notification that the portable device has changed from a state located outside the communicable range with the vehicle-side device to a state located within the communicable range with the vehicle-side device. And

  When the public line terminal notifies the above notification, the user is in a state in which the user (that is, the portable device) is separated from the vehicle and the portable device is in a state outside the communicable range with the vehicle side device. Considering whether the mobile device is in a state where it is located within the communicable range with the device and determining that the portable device has received this notification even though it is located outside the communicable range with the vehicle side device. It becomes possible to recognize that there is a high possibility that the vehicle is subjected to a relay attack.

  Further, in the configuration described in claim 1, it is determined whether the portable device is in a state located outside the communicable range with the vehicle side device or in a communicable range with the vehicle side device. Is a vehicle-side determination control unit, that is, a vehicle-side device, not a portable device. Therefore, the structure of the portable device is not complicated, and the calculation load related to the portable device is reduced as compared with the conventional technology, so that the shortening of the life of the built-in battery of the portable device can be reduced. Become.

  As described above, according to the configuration of the first aspect, it is possible to recognize that the vehicle may be subjected to the relay attack while reducing the shortening of the life of the built-in battery of the portable device. It becomes like this.

  In the configuration described in claim 1, as in the invention described in claim 2, the vehicle-side determination control unit is configured so that the portable device is connected to the vehicle-side device from a state where the portable device is located within a communicable range with the vehicle-side device. The vehicle side public line communication unit transmits a notification to that effect to the public line terminal, and the terminal side notification unit transmits the terminal side public line communication. It is good also as notifying of the change which the portable machine received from the part to the state located in the communicable range with the vehicle side apparatus changed from the state located in the communicable range with the vehicle side apparatus.

  In the configuration according to claim 1 or 2, in the invention according to claim 3, the vehicle-side public line communication unit transmits and receives information to and from the public line terminal through the public line. The terminal-side public line communication unit transmits / receives information to / from the vehicle-side device via the public line, and the public-line terminal is located outside the communication range of the portable device with the vehicle-side device. The terminal side public line communication unit receives a notification that the state has changed to a state located within the communicable range with the vehicle side device, and based on the fact that the predetermined control stop condition is satisfied, A terminal-side determination control unit that transmits an instruction to stop the vehicle control from the line communication unit to the vehicle-side device, and the vehicle-side determination control unit is configured to stop the vehicle control by the vehicle-side public line communication unit. Based on receiving instructions , It was decided to stop the control of the vehicle. Thus, the control of the vehicle can be stopped by transmitting an instruction to stop the control of the vehicle from the public line terminal, and thus the vehicle can be prevented from being stolen.

  In the configuration according to any one of claims 1 to 3, in the invention according to claim 4, the vehicle-side determination control unit is configured to perform a predetermined notification stop operation on the vehicle-side device. The transmission of the notification may be stopped.

  In addition, invention of Claim 5 is a vehicle side apparatus which comprises the electronic key system in any one of Claims 1-4.

It is a block diagram which shows the outline | summary of the electronic key system which concerns on this invention. It is a block diagram which shows the structural example of the vehicle side apparatus about the electronic key system of this Embodiment. It is a block diagram which shows the structural example of a portable machine about the electronic key system of this Embodiment. It is a block diagram which shows the structural example of a mobile telephone about the electronic key system of this Embodiment. It is a flowchart which shows the process sequence of the notification process performed by the vehicle side apparatus about the electronic key system of this Embodiment. It is a flowchart which shows the process sequence about the control stop process performed during a notification process. It is a flowchart which shows the process sequence of the alerting | reporting process performed with a mobile telephone about the electronic key system of this Embodiment.

  Hereinafter, an electronic key system according to an embodiment of the present invention and an embodiment of a vehicle side device constituting the electronic key system will be described with reference to FIGS.

  As shown in FIG. 1, the electronic key system 1 of the present embodiment has a vehicle-side device 100 mounted on a vehicle C and a portable device 200 that is carried by the user. A so-called smart entry that performs control such as unlocking of a vehicle door when the portable device 200 enters a communicable range around the vehicle C using wireless communication between the vehicle-side device 100 and the portable device 200. And a so-called remote keyless entry function for performing control such as locking and unlocking of a vehicle door in accordance with the operation of a switch of the portable device 200.

  The electronic key system 1 according to the present embodiment further includes a mobile phone 300 that is carried by the user as well as the vehicle-side device 100 and the portable device 200, and is carried from the vehicle-side device 100 to the user. The mobile phone 300 is notified using wireless communication via public line communication. The mobile phone 300 corresponds to the public line terminal described in the claims.

  A configuration example of the vehicle-side device 100 is shown in FIG. As shown in FIG. 2, the vehicle-side device 100 includes a determination control unit 101, an LF transmission unit 102, a UHF reception unit 103, a public line communication unit 104, a storage unit 105, an engine switch 106, a door antenna 107, an indoor antenna. 108 and an antenna 109 outside the back door.

  Among these, the determination control unit 101 is a known computer having a CPU and a built-in memory (not shown), and performs various processes in accordance with programs stored in advance in the built-in memory or the storage unit 105 that is an external memory. Execute. The determination control unit 101 corresponds to the vehicle-side determination control unit described in the claims.

  The LF transmission unit 102 includes an LF antenna, and transmits a signal to the portable device 200 using an LF band (for example, “30 to 300 [kHz]”) via the LF antenna. Signals transmitted from the LF transmitter 102 reach only within a limited communication area via the door antenna 107, the indoor antenna 108, and the backdoor outside antenna 109 arranged at four locations of the vehicle C, respectively. . Further, the UHF receiving unit 103 has a UHF antenna, and a signal transmitted from the portable device 200 in a UHF band (for example, “300 [MHz] to 3 [GHz]”) is transmitted to the UHF antenna. Receive via. The UHF receiving unit 103 is connected to the determination control unit 101, and outputs a signal received by the UHF antenna to the determination control unit 101. The LF transmitter 102 corresponds to the vehicle-side transmitter described in the claims, and the UHF receiver 103 corresponds to the vehicle-side receiver described in the claims.

  The storage unit 105 includes an appropriate storage device such as a flash memory, for example, and is connected to the determination control unit 101. For example, for notification that the portable device 200 has changed from a state in which the portable device 200 is located outside the communicable range with the vehicle side device 100 to a state in which the portable device 200 is located within the communicable range with the vehicle side device 100. Mail data such as “entered within the communicable range”, from the state where the portable device 200 is located within the communicable range with the vehicle side device 100 to the state located outside the communicable range with the vehicle side device 100 Various data such as e-mail data such as “out of communication range” for notifying the change, and destination data for the mobile phone 300 to receive these e-mails via the public line are stored. And is appropriately read out by the judgment control unit 101.

  The engine switch 106 is a push switch for the user to operate to start the operation of an in-vehicle engine (not shown), and is connected to the determination control unit 101. When the user performs a push operation, the engine switch 106 outputs an electric signal indicating that to the determination control unit 101. Based on this electric signal, the judgment control unit 101 selects the vehicle C from among “IG-ON (start operation of the in-vehicle engine)”, “ACC (accessory)”, and “IG-OFF (stop operation of the in-vehicle engine)”. Control the state of When the engine switch 106 is set to “IG-ON”, the in-vehicle engine starts operating by being controlled by the determination control unit 101, and various in-vehicle devices other than the vehicle-side device 100 are powered from an in-vehicle battery (not shown). Is supplied and becomes operable. The vehicle-side device 100 is operable by receiving power supply regardless of whether the engine is operating or stopped.

  When the engine switch 106 is set to “ACC” by the user, the determination control unit 101 controls the vehicle-mounted engine to stop operating, and various vehicle-mounted devices can operate by being supplied with power from a vehicle battery (not shown). Become. When the engine switch 106 is set to “IG-OFF” by the user, the on-board engine stops operating due to the control by the determination control unit 101, and the on-vehicle device is also operated because power is not supplied from the on-vehicle battery (not shown). Stop.

  The public line communication unit 104 has an antenna, and transmits a signal using a radio wave of a predetermined frequency band to a base station (not shown) via the antenna, and transmits the radio wave of this frequency band from the base station. The incoming signal is received via the antenna. The signal transmitted from the public line communication unit 104 has a much wider communication area than signals transmitted from the LF transmission unit 102 and the UHF transmission unit 203 described later. The public line communication unit 104 is connected to the determination control unit 101, and transmits a signal output from the determination control unit 101 from the antenna, while outputting a signal received by the antenna to the determination control unit 101. To do.

  The base station is connected to a public line (not shown). Therefore, the vehicle side device 100 can transmit / receive information to / from a terminal (for example, the mobile phone 300) connected to the public line via the public line by the public line communication unit 104. Therefore, the public line communication unit 104 corresponds to the vehicle-side public line communication unit described in the claims.

  A configuration example of the portable device 200 is shown in FIG. As illustrated in FIG. 3, the portable device 200 includes a determination control unit 201, an LF reception unit 202, a UHF transmission unit 203, a storage unit 205, an unlock switch 206, and a lock switch 207.

  Of these, the judgment control unit 201 is a known computer having a CPU and a built-in memory, not shown, and performs various processes according to programs stored in advance in the built-in memory or the storage unit 205, which is an external memory. Execute. The determination control unit 201 corresponds to the portable device side determination control unit described in the claims.

  The LF receiving unit 202 includes an LF antenna, and receives a signal transmitted from the vehicle-side device 100 using an LF band radio wave via the LF antenna. The LF reception unit 202 is connected to the determination control unit 201 and outputs a signal received by the LF antenna to the determination control unit 201. The UHF transmission unit 203 has a UHF antenna, and transmits a signal to the vehicle-side device 100 using a UHF band radio wave via the UHF antenna. The UHF transmission unit 203 is connected to the determination control unit 201 and transmits a signal output from the determination control unit 201 from the UHF antenna. The LF reception unit 202 corresponds to the portable device side reception unit described in the claims, and the UHF transmission unit 203 corresponds to the portable device side transmission unit described in the claims.

  The unlock switch 206 and the lock switch 207 are switches mainly for using the remote keyless entry function. When the unlock switch 206 is operated by one push, the vehicle door is unlocked. When the lock switch 207 is operated by one push, the vehicle door is locked.

  Next, the outline of the smart entry function for unlocking the vehicle door according to the result of code verification using wireless communication between the vehicle side device 100 and the portable device 200 will be described.

  Each unit of the vehicle-side device 100 operates under the control of the determination control unit 101, and under this control, the LF transmission unit 102 periodically transmits a so-called request signal that requests transmission of an answer signal. Each unit of the portable device 200 operates under the control of the determination control unit 201. When the portable device 200 is within a communicable range where the request signal from the LF transmission unit 102 can be received, the request signal is The LF receiving unit 202 receives it.

  In addition, between the vehicle side apparatus 100 and the portable device 200, in order to limit the communicable range for transmission / reception of request signals to the periphery of the vehicle C, LF band radio waves using the LF transmission unit 102 and the LF reception unit 202 are used. Wireless communication using is performed. Specifically, by transmitting signals from the door antenna 107, the indoor antenna 108, the back door external antenna 109, and the like, the communicable range can be limited to the vicinity of the vehicle door, the vehicle interior, and the vicinity of the trunk. Thereby, possibility that the portable device 200 will receive the request signal from the vehicle side apparatus 100 of another vehicle can be made low, for example.

  When the LF reception unit 202 receives a request signal from the vehicle-side device 100, the UHF transmission unit 203 transmits an answer signal including a code unique to the vehicle C. Then, in the vehicle-side device 100, the UHF receiving unit 103 receives the answer signal transmitted from the portable device 200.

  Note that wireless communication using a radio wave in the UHF band is performed between the UHF receiver 103 and the UHF transmitter 203. The reason why the UHF band radio wave is used for the transmission / reception of the answer signal is that even if the output level of the signal transmitted from the portable device 200 is weak, the communication distance can be appropriately obtained, and the answer signal is more reliably transmitted to the vehicle side device 100 side. This is because it can be transmitted.

  When the UHF receiving unit 103 receives an answer signal transmitted from the portable device 200, the determination control unit 101 of the vehicle-side device 100 uses a code in which the code included in the answer signal is stored in the determination control unit 101. Is matched, and if it matches, unlocking of the vehicle door is permitted.

  Note that, after unlocking the vehicle door, known control in this type of electronic key system is executed. For example, when it is detected that a person has touched the door knob by a signal from a touch sensor (not shown) provided on the door knob outside the driver's door in the unlocked state, the determination control unit 101 performs door control. An unlock signal is output to the system, and as a result, a door lock motor (not shown) is driven and all vehicle doors are unlocked. In addition to this, various controls such as a state where the engine start is permitted are performed. However, since these controls are known in the art, further explanation is omitted here.

  A configuration example of the mobile phone 300 is shown in FIG. As shown in FIG. 4, the mobile phone 300 includes a determination control unit 301, a public line communication unit 302, a speaker 303, and a display 304.

  Among these, the determination control unit 301 is a known computer having a CPU and a built-in memory, not shown, and executes various processes according to programs stored in advance in the built-in memory. The determination control unit 301 corresponds to the terminal-side determination control unit described in the claims.

  The public line communication unit 302 has an antenna, transmits a signal using a radio wave in a predetermined frequency band to a base station (not shown) via the antenna, and transmits the signal from the base station using a radio wave in this frequency band. The incoming signal is received via the antenna. The signal transmitted from the public line communication unit 302 has a much wider communication area than the signals transmitted from the LF transmission unit 102 and the UHF transmission unit 203. The public line communication unit 302 is connected to the determination control unit 301 and transmits a signal output from the determination control unit 301 from the antenna, while outputting a signal received by the antenna to the determination control unit 301. To do.

  The base station is connected to a public line (not shown). Therefore, the mobile phone 300 can transmit / receive information to / from a terminal (for example, the vehicle-side device 100) connected to the public line via the public line by the public line communication unit 302. Accordingly, the public line communication unit 302 corresponds to the terminal-side public line communication unit described in the claims.

  The speaker 303 is connected to the determination control unit 301 and outputs a predetermined warning sound or the like. Moreover, the display 304 is comprised with LCD and LED, and displays various information. The speaker 303 and the display 304 correspond to a terminal side notification unit described in the claims.

  By the way, there is a technique called a relay attack in which a relay device capable of relaying a request signal transmitted from the vehicle side device 100 and an answer signal transmitted from the portable device 200 between the vehicle side device 100 and the portable device 200 is provided. Are known.

  When the relay attack is received, even if the portable device 200 is located at a location away from the vehicle-side device 100, code verification using wireless communication is performed between the portable device 200 and the vehicle-side device 100. A third party who is not an authorized user of the vehicle C can unlock the vehicle door. As a result, the vehicle C may be stolen.

  Therefore, in the present embodiment, the vehicle-side device 100 (specifically, the determination control unit 101) determines that the portable device 200 is out of the communication range with the vehicle-side device 100 based on whether or not the answer signal can be received by the UHF reception unit 103. It is determined whether it is in a state located in the communication range or in a communicable range. And the vehicle side apparatus 100 is based on the portable device 200 changing from the state located outside the communicable range with the said vehicle side apparatus 100 to the state located within the communicable range with the said vehicle side apparatus 100. The public line communication unit 104 notifies the mobile phone 300 of the notification, and the mobile phone 300 notifies the notification by the speaker 303 and the display 304. Further, the vehicle-side device 100 is based on the fact that the portable device 200 has changed from a state where it is located within the communicable range with the vehicle-side device 100 to a state located outside the communicable range with the vehicle-side device 100. The public line communication unit 104 notifies the mobile phone 300 of the notification, and the mobile phone 300 notifies the notification by the speaker 303 and the display 304.

  Furthermore, the mobile phone 300 (specifically, the determination control unit 301) changes from a state where the portable device 200 is located outside the communicable range with the vehicle-side device 100 to a state located within the communicable range with the vehicle-side device 100. The public line communication unit 302 transmits an instruction to stop the control of the vehicle C to the vehicle side device 100 based on the fact that the public line communication unit 302 has received the notification to the effect. Then, the vehicle-side device 100 (specifically, the determination control unit 101) stops the control of the vehicle C based on the fact that the public line communication unit 104 has received an instruction to stop the control of the vehicle C. .

  FIG. 5 is a flowchart showing a processing procedure of the notification processing S1 executed by the vehicle side device 100, and FIG. 6 is a flowchart showing a processing procedure of the control stop processing S17 executed during the notification processing S1. Hereinafter, the operation of the vehicle side device 100 will be described with reference to FIGS. 5 and 6. The vehicle-side device 100 repeatedly executes these notification processes S1 every predetermined time (for example, “1 [second]”).

  When the execution of the notification process S1 is started, the vehicle-side apparatus 100 first determines whether or not the operation mode of the vehicle-side apparatus 100 is set to the notification mode as a determination process in step S11. Specifically, the determination control unit 101 determines whether the notification mode flag, which is a flag indicating that the notification mode is set, is set or reset in the built-in memory as the determination processing in step S11. .

  Here, the notification mode is a case where it is determined that the portable device 200 has changed from a state where the portable device 200 is located within the communicable range with the vehicle side device 100 to a state located outside the communicable range with the vehicle side device 100; When it is determined that the portable device 200 has changed from a state where it is located outside the communicable range with the vehicle-side device 100 to a state located within the communicable range with the vehicle-side device 100, the mobile phone 300 is notified accordingly. This is the operation mode to be notified. The non-notification mode, which is an operation mode that is not a notification mode, refers to a state in which the portable device 200 is located within the communicable range with the vehicle side device 100 and is located outside the communicable range with the vehicle side device 100. When it is determined that it has changed, and when it is determined that the portable device 200 has changed from a state where it is located outside the communicable range with the vehicle side device 100 to a state where it is located within the communicable range with the vehicle side device 100. This is an operation mode in which transmission of the notification to that effect to the mobile phone 300 is stopped.

  In the present embodiment, the operation mode is normally set to the notification mode, and the operation mode is set to the non-notification mode when a predetermined notification stop operation is performed. The determination control unit 101 sets the notification mode flag in the built-in memory when the notification mode is set, and sets the notification mode flag when the non-notification mode is set. Not set in memory (ie reset)

  Further, in the present embodiment, as the predetermined notification stop operation, for example, the unlock switch 206 of the portable device 200 is pushed five times within 5 [seconds] after being “IG-OFF” by the engine switch 106. However, it is possible to adopt an appropriate operation.

  If it is not determined that the notification mode is set in the determination process of step S11 (that is, “No” in the determination process of step S11), the determination control unit 101 ends the notification process S1 as it is. On the other hand, if it is determined that the notification mode is set in the determination process of step S11 (that is, “Yes” in the determination process of step S11), the determination control unit 101 proceeds to the determination process of the subsequent step S12. To do.

  When the determination process proceeds to step S12, the determination control unit 101 determines whether or not the portable device 200 is located within a communicable range with the vehicle-side device 100 based on whether or not the answer signal can be received by the LF reception unit 202. Judging. Specifically, when the reception level of the answer signal from the portable device 200 exceeds the predetermined determination threshold and the determination control unit 101 can receive the answer signal, the portable device 200 can communicate with the vehicle-side device 100. If the reception level of the answer signal from the portable device 200 is equal to or lower than the predetermined determination threshold value and the answer signal cannot be normally received, the portable device 200 communicates with the vehicle-side device 100. It is determined that the state is located outside the possible range.

  When it is determined that the portable device 200 is located within the communicable range with the vehicle-side device 100 (“Yes” in the determination process of step S12), the determination control unit 101 determines that the portable device 200 is the subsequent determination process of step S13. It is determined whether or not the state has changed to a state located outside the communicable range. Specifically, the determination control unit 101 determines whether the reception level of the answer signal that has exceeded the predetermined determination threshold is equal to or lower than the predetermined determination threshold. Here, when it is not determined that the portable device 200 has changed to a state where the portable device 200 is located within a communicable range with the vehicle-side device 100 (“No” in the determination process of step S13), the determination control unit 101 performs this step. When the determination process of S13 is executed again and it is determined that the portable device 200 has changed to a state where it is located outside the communicable range with the vehicle side device 100 (“Yes” in the determination process of step S13), the determination control unit 101 Shifts to the process of the following step S14. That is, the determination control unit 101 waits until the portable device 200 changes to a state located outside the communicable range with the vehicle-side device 100 through the determination process in step S13.

  When the process proceeds to step S <b> 14, the determination control unit 101 changes from a state in which the portable device 200 is located within the communicable range with the vehicle-side device 100 to a state located outside the communicable range with the vehicle-side device 100. The notification process S1 is terminated. Specifically, when the process proceeds to step S14, the determination control unit 101 reads out the mail data “out of communication range” and the destination data of the mobile phone 300 from the storage unit 105, and the public This mail is transmitted to the mobile phone 300 using the line communication unit 104. When the user carrying the mobile device 200 and the mobile phone 300 confirms the content of the mail that has arrived at the mobile phone 300, the user is positioned outside the communicable range from the state in which the user is within the communicable range with the vehicle side device 100. It becomes possible to recognize that the electronic key system 1 is operating normally, as well as to recognize that the electronic key system 1 has been changed to a state in which the electronic key system 1 has been changed.

  On the other hand, in the determination process of step S12, if it is not determined that the portable device 200 is in a state in which communication with the vehicle side device 100 is possible (“No” in the determination process of step S12), determination control is performed. Unit 101 means that portable device 200 is located outside the communicable range with vehicle-side device 100. At this time, the determination control unit 101 determines whether or not the portable device 200 has changed to a state where the portable device 200 is located within the communicable range as the determination processing in the subsequent step S15.

  Here, if it is not determined that the portable device 200 has changed to a state in which the portable device 200 is within the communicable range with the vehicle-side device 100 (“No” in the determination process in step S15), the determination control unit 101 performs this step. When the determination process of S15 is executed again and it is determined that the portable device 200 has changed to a state in which communication is possible with the vehicle side device 100 ("Yes" in the determination process of step S15), the determination control unit 101 Shifts to the process of the following step S16. That is, the determination control unit 101 waits until the portable device 200 changes to a state where it is located within a communicable range with the vehicle-side device 100 through the determination process in step S15.

  When the process proceeds to step S <b> 16, the determination control unit 101 changes from a state where the portable device 200 is located outside the communicable range with the vehicle side device 100 to a state located within the communicable range with the vehicle side device 100. To that effect, the process proceeds to the subsequent control stop process S17 (FIG. 6). Specifically, when the process proceeds to step S16, the determination control unit 101 transmits the mail data “entered within the communicable range” and the destination data of the mobile phone 300 (such as a telephone number or an e-mail address). ) Is read from the storage unit 105, and this mail is transmitted to the mobile phone 300 using the public line communication unit 104. The user carrying the mobile device 200 and the mobile phone 300 confirms the contents of the mail that has arrived at the mobile phone 300, so that the user can move from the state where the user is outside the communicable range with the vehicle side device 100 to the vehicle side device 100. It becomes possible to recognize that the state has changed to a state located within the communicable range. Then, the user considers the separation distance between the user (that is, the portable device 200) and the vehicle C, and receives this notification even though the portable device 200 is located outside the communicable range with the vehicle-side device 100. If it is determined that the vehicle C has been subjected to the relay attack, it can be recognized that there is a high possibility that the vehicle C has received a relay attack.

  In the present embodiment, the vehicle-side device 100 changes from a state where the portable device 200 is located within the communicable range with the vehicle-side device 100 to a state located outside the communicable range with the vehicle-side device 100. When the mobile device 200 changes from a state where the portable device 200 is located within the communicable range with the vehicle-side device 100 to a state where it is located outside the communicable range with the vehicle-side device 100, by e-mail The notification to that effect is made, but instead of the notification by e-mail, or in addition to the notification by e-mail, notification may be made by voice guidance by telephone. Specifically, in order to notify the storage unit 105 that the portable device 200 has changed from a state where it is located outside the communicable range with the vehicle side device 100 to a state where it is located within the communicable range with the vehicle side device 100. For example, voice guidance data such as “entered within the communicable range” or the state where the portable device 200 is located within the communicable range with the vehicle side device 100 is located outside the communicable range with the vehicle side device 100. For example, voice guidance data for notifying that the status has been changed, such as “going out of communication range”, or a phone number for the mobile phone 300 to receive these voice guidance via a public line is stored. good. The vehicle-side device 100 changes from a state in which the portable device 200 is located within a communicable range with the vehicle-side device 100 to a state located outside the communicable range with the vehicle-side device 100, and When the portable device 200 changes from a state where it is located within the communicable range with the vehicle side device 100 to a state where it is located outside the communicable range with the vehicle side device 100, the mobile phone 300 is called, When a voice call is established, the fact may be notified by voice guidance. In addition, the notification by the voice guidance does not notice the incoming call from the vehicle side device 100, or if it is out of the service area at the time of the incoming call, it cannot be notified to that effect. In some cases, it is possible to notify that.

  When the process proceeds to the control stop process S17, the determination control unit 101 first determines whether or not a control stop instruction is received from the mobile phone 300 via the public line communication unit 104 as the determination process in step S171. Here, when it is not determined that the control stop instruction has been received (“No” in the determination process of step S171), the determination control unit 101 ends the control stop process S17 and the notification process S1 as they are. On the other hand, if it is determined that the control stop instruction has been received (“Yes” in the determination process in step S171), the determination control unit 101 performs the subsequent process in step S172, for example, for stopping the unlocking of the vehicle door. After stopping the control, the control stop process S17 and the notification process S1 are terminated. Although the control stop instruction will be described later, by executing this control stop process S17, the determination control unit 101 can stop the control of the vehicle C, and thus the vehicle C is not stolen. Will be able to prevent.

  FIG. 7 is a flowchart showing a processing procedure of the notification processing S <b> 2 executed by the mobile phone 300. Note that the mobile phone 300 repeatedly executes the notification process S2 every predetermined time (for example, “1 second”).

  When the mobile phone 300 (specifically, the determination control unit 301) starts executing the notification process S2, first, as a determination process in step S21, the mobile device 200 starts from the state where the mobile device 200 is located within the communicable range with the vehicle-side device 100. It is determined whether or not a notification indicating a change to a state located outside the communicable range with the side device 100 has been received. Here, if the notification indicating that the state has changed to a state located outside the communicable range is not received (“No” in the determination process in step S21), the determination control unit 301 proceeds to the determination process in step S23. On the other hand, when a notification indicating that the state has changed to a state located outside the communicable range is received (“Yes” in the determination process of step S21), the determination control unit 301 moves out of the communicable range as the process of subsequent step S22. A notification to the effect that the state has been changed is notified by the speaker 303 and the display 304, and the process proceeds to the determination process in step S23.

  When the process proceeds to the determination process in step S23, the determination control unit 301 changes from a state where the portable device 200 is located outside the communicable range with the vehicle side device 100 to a state located within the communicable range with the vehicle side device 100. It is determined whether or not a notification to the effect has been received. Here, when the notification indicating that the state has been changed to the state within the communicable range is not received (“No” in the determination process in step S23), the determination control unit 301 ends the notification process S2 as it is. On the other hand, when the notification indicating that the state has been changed to the state within the communicable range is received (“Yes” in the determination process in step S23), the determination control unit 301 performs the process in step S24 within the communicable range. A notification to the effect that the state has been changed is notified by the speaker 303 and the display 304, and the process proceeds to the determination process in step S25.

  When the process proceeds to the determination process of step S25, that is, after receiving a notification that the state has been changed to be within the communicable range, the determination control unit 301 determines whether or not a predetermined control stop condition is satisfied. Specifically, the determination control unit 301 displays, for example, “Do you want to stop control of the vehicle C?” On the display 304, and an appropriate push button not shown in FIG. In this case, it is determined that a predetermined control stop condition is satisfied. In the present embodiment, it is determined that the control stop condition is satisfied when the push button is pressed and held for one second or longer. However, the present invention is not limited to this, and the user intends to stop the control of the vehicle C. Any condition can be used as long as it can be confirmed.

  Here, when it is not determined that the predetermined control stop condition is satisfied (“No” in the determination process of step S25), the determination control unit 301 ends the notification process S2 as it is. On the other hand, when it is determined that the predetermined control stop condition is satisfied (“Yes” in the determination process in step S25), the determination control unit 301 transfers the process from the public line communication unit 302 to the vehicle-side device 100 as the subsequent step S26. The instruction | indication which stops control of the vehicle C is transmitted, and this alerting | reporting process S2 is complete | finished. As described above, the vehicle-side device 100 that has received this control stop instruction from the mobile phone 300 stops the control of the vehicle C.

  In the electronic key system 1 of the above embodiment, the vehicle-side device 100 is in a state where the portable device 200 is located outside the communicable range with the vehicle-side device 100 based on whether or not the answer signal can be received by the UHF receiver 103. It is determined whether it is in a state where it is within a communicable range. And the vehicle side apparatus 100 is based on the portable device 200 changing from the state located outside the communicable range with the said vehicle side apparatus 100 to the state located within the communicable range with the said vehicle side apparatus 100. The public line communication unit 104 notifies the mobile phone 300 of the notification, and the mobile phone 300 notifies the notification by the speaker 303 and the display 304.

  Thereby, the user carrying the portable device 200 and the mobile phone 300 has changed from a state where he / she is located outside the communicable range with the vehicle-side device 100 to a state located within the communicable range with the vehicle-side device 100. You will be able to recognize that. Then, the user considers the separation distance between the user (that is, the portable device 200) and the vehicle C, and receives this notification even though the portable device 200 is located outside the communicable range with the vehicle-side device 100. If it is determined that the vehicle C has been subjected to the relay attack, it can be recognized that there is a high possibility that the vehicle C has received a relay attack.

  The determination control unit 101 determines whether the portable device 200 is in a state where it is located outside the communicable range with the vehicle side device 100 or a state where it is located within the communicable range with the vehicle side device 100. That is, it is the vehicle side device 100 and not the portable device 200. For this reason, the calculation load related to the portable device 200 is reduced as compared with the conventional technology described in the background art section, so that the shortening of the life of the built-in battery of the portable device 200 can be reduced.

DESCRIPTION OF SYMBOLS 1 ... Electronic key system, 100 ... Vehicle side apparatus, 101 ... Judgment control part (vehicle side judgment control part), 102 ... LF transmission part (vehicle side transmission part), 103 ... UHF reception part (vehicle side reception part), 104 ... public line communication unit (vehicle side public line communication unit), 106 ... engine switch, 107 ... door antenna, 108 ... indoor antenna, 109 ... antenna outside back door, 200 ... portable device, 201 ... judgment control unit (portable device side) (Determination control unit), 202... LF reception unit (portable device side reception unit), 203... UHF transmission unit (portable device side transmission unit), 205... Storage unit, 206 ... unlock switch, 207. Telephone (public line terminal), 301 ... Judgment control unit (terminal side control unit), 302 ... Public line communication unit (terminal side public line communication unit), 303 ... Speaker (terminal side notification unit) 304 ... display (terminal-side notification unit), C ... vehicle

Claims (5)

Control of the vehicle using wireless communication between a portable device carried by the user and a vehicle-side device mounted on the vehicle, and a public line terminal carried by the user from the vehicle-side device An electronic key system that performs notification using wireless communication via a public line,
The vehicle side device
A vehicle-side transmitter that transmits a request signal for requesting the portable device to transmit an answer signal;
A vehicle-side receiving unit for receiving the answer signal;
A vehicle-side public line communication unit for transmitting information via a public line to a public line terminal carried by the user;
Based on whether or not the answer signal can be received by the vehicle-side receiver, it is determined whether the portable device is located outside the communicable range or the communicable range with the vehicle-side device. And the vehicle-side public line communication is based on a change from a state where the portable device is located outside the communicable range with the vehicle-side device to a state located within the communicable range with the vehicle-side device. A vehicle-side determination control unit that transmits a notification to that effect to the public line terminal from the unit,
The public line terminal is
A terminal-side public line communication unit that receives the notification via the public line;
The fact that the portable device received from the terminal-side public line communication unit has changed from a state where it is located outside the communicable range with the vehicle-side device to a state located within the communicable range with the vehicle-side device. An electronic key system comprising: a terminal-side notifying unit for notifying the notification. The electronic key system according to claim 1.
The vehicle-side determination control unit is based on the fact that the portable device has changed from a state where the portable device is located within a communicable range with the vehicle-side device to a state located outside the communicable range with the vehicle-side device. A notification to that effect is sent from the vehicle-side public line communication unit to the public line terminal,
The terminal-side informing unit is out of a communicable range with the vehicle-side device from a state in which the portable device is located within a communicable range with the vehicle-side device, received by the terminal-side public line communication unit. An electronic key system characterized in that a notification of a change to a state located at is provided. The electronic key system according to claim 1 or 2,
The vehicle-side public line communication unit transmits / receives information to / from the public line terminal via a public line,
The terminal-side public line communication unit transmits / receives information to / from the vehicle-side device via a public line,
The public line terminal notifies the terminal that the portable device has changed from a state where the portable device is located outside the communicable range with the vehicle side device to a state located within the communicable range with the vehicle side device. Terminal side that causes the terminal side public line communication unit to send an instruction to stop the control of the vehicle to the vehicle side device based on the fact that a predetermined control stop condition has been established. A judgment control unit;
The electronic key system according to claim 1, wherein the vehicle-side determination control unit stops the control of the vehicle based on receiving an instruction to stop the control of the vehicle by the vehicle-side public line communication unit. The electronic key system according to any one of claims 1 to 3,
The electronic key system according to claim 1, wherein the vehicle-side determination control unit stops transmission of the notification based on a predetermined notification stop operation performed on the vehicle-side device.   The vehicle side apparatus which comprises the electronic key system as described in any one of Claims 1-4.

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