JP5432192B2 - Electronic key system - Google Patents

Description

  The present invention relates to an electronic key system.

  In the conventional electronic key system, locking / unlocking of the vehicle door, engine starting, and the like are permitted through wireless communication between the electronic key and the vehicle. For example, in the electronic key system disclosed in Patent Document 1, the vehicle includes an in-vehicle antenna that transmits a request signal to the in-vehicle communication area and an out-of-vehicle antenna that transmits the request signal to the out-of-vehicle communication area. When the electronic key that has entered both communication areas receives the request signal, it transmits a response signal including an ID code. The vehicle permits the locking and unlocking of the vehicle door when collation of the ID code included in the response signal from the electronic key existing in the outside communication area is established. On the other hand, the vehicle permits the start of the engine when collation of the ID code included in the response signal from the electronic key existing in the in-vehicle communication area is established.

JP 2002-029385 A

  In recent years, there has been a concern about unauthorized communication in which a distant electronic key is disguised as if it exists inside or outside a vehicle using a repeater that relays radio waves (request signal, response signal). Unauthorized communication using this repeater may cause unauthorized unlocking of the vehicle door or engine start. For this reason, security technology against unauthorized communication using a repeater has been demanded.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an electronic key system with further improved security.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
In the first aspect of the invention, when the electronic key receives a request signal transmitted from the in-vehicle device to the inside / outside of the vehicle, the electronic key transmits a response signal including an ID code, and the in-vehicle device includes the ID code included in the received response signal. In the electronic key system having a key operation free system for performing verification, whether the wireless communication through the request signal and the response signal between the electronic key and the in-vehicle device is unauthorized communication using a repeater A determination unit configured to determine whether or not the vehicle-mounted device is in a travel-permitted state on condition that the ID code verification is established when it is determined through the determination unit that the communication is not unauthorized using a repeater. In addition, when it is determined through the determination unit that the communication is illegal using a repeater, the mode is changed to a warning mode. Regulate to said running permission state regardless success of collation of the ID code, the transponder response the electronic key including also locally ID code upon receiving a driving signal transmitted locally from said vehicle unit The vehicle-mounted device includes an immobilizer system that transmits a signal and performs verification of an ID code included in the received transponder response signal. The vehicle-mounted device is configured to verify ID code in the immobilizer system in the alert mode. The gist is to place the vehicle in a run-permitted state .

  In a key operation-free system, by interposing a repeater between the in-vehicle device and the electronic key, wireless communication is established between the electronic key and the in-vehicle device even though the electronic key is located far from the vehicle. There is a concern that the vehicle may be illegally allowed to run. According to the above configuration, the in-vehicle device restricts the vehicle from being allowed to travel through the key operation free system when it is determined through the determination unit that the communication is unauthorized using the repeater. As a result, it is possible to prevent the vehicle from being allowed to travel through unauthorized communication using a repeater, thereby further improving security.

  In the immobilizer system, unlike the above-described key operation free system, there is no possibility of unauthorized communication using a repeater. This is because the drive signal and the transponder response signal are signals transmitted locally. According to the above configuration, even when it is determined through the determination unit that the communication is unauthorized using the repeater, the vehicle is permitted to run when the ID code verification in the immobilizer system is established. Thereby, even if it is a warning mode, a vehicle can be made into a driving | running | working permission state, ensuring security.

Invention according to claim 2, the electronic key system according to claim 1, the control request signal including the ID code from the electronic key based on the operation of a switch provided in the electronic key is sent, the vehicle device A wireless key system for verifying an ID code included in the received control request signal is provided, and the in-vehicle device releases the alert mode when the ID code verification in the wireless key system is established in the alert mode. The gist of the invention is that the vehicle is allowed to run when the ID code verification in the key operation free system is established.

  In the wireless key system, there is no risk of unauthorized communication using a repeater. In this system, a control request signal is transmitted from an electronic key triggered by a user's switch operation. As in the above key operation free system, a signal is transmitted from the electronic key through the request signal without the user's intention. Because you can't.

  According to the above configuration, in the alert mode, when the ID code verification in the wireless key system is established, the alert mode is canceled because there is no possibility of unauthorized communication using the repeater. In this case, the in-vehicle device sets the vehicle in a travel-permitted state even when the ID code verification in the key operation free system is established. This allows the vehicle to run through the key operation free system by canceling the mode even if it is shifted to the alert mode due to an erroneous determination that the communication is illegal using the repeater. State. Therefore, convenience can be improved.

  According to the present invention, security can be further improved in an electronic key system.

The block diagram of an electronic key system. The flowchart which shows the process sequence of a vehicle-mounted apparatus.

  Hereinafter, an embodiment embodied in an electronic key system according to the present invention will be described with reference to FIGS. A vehicle is equipped with a key operation free system, a wireless key system, and an immobilizer system as electronic key systems.

<Electronic key>
First, a configuration related to a key operation free system in an electronic key will be described.
As shown in FIG. 1, an electronic key 10 includes an electronic key control unit 11 constituted by a computer unit, an LF receiving unit 12 that receives a radio signal in an LF (low frequency) band, and an UHF (Ultra High Frequency) band. And a UHF transmitter 13 for transmitting the wireless signal.

  The LF receiver 12 continuously receives a request signal and two RSSI measurement signals transmitted from the in-vehicle device 20 via the receiving antenna 12a. The request signal and the two RSSI measurement signals are LF band radio signals. Then, the LF receiving unit 12 demodulates these signals into pulse signals and outputs them to the electronic key control unit 11.

  The LF receiver 12 includes an RSSI detection circuit 19. The RSSI detection circuit 19 detects the RSSI of the two RSSI measurement signals and outputs the detection results to the electronic key control unit 11.

  The electronic key control unit 11 includes a nonvolatile memory 11a, and an ID code unique to the electronic key 10 is stored in the memory 11a. When the electronic key control unit 11 recognizes the request signal from the LF reception unit 12, the electronic key control unit 11 outputs a response signal including the ID code stored in the memory 11 a and the detection result of the RSSI detection circuit 19 to the UHF transmission unit 13. The UHF transmitter 13 modulates the response signal and transmits it as a UHF band radio signal via the transmission antenna 13a.

Next, the structure which concerns on the immobilizer system in the electronic key 10 is demonstrated.
The electronic key 10 includes a transponder 14. The transponder 14 includes a coil and an IC chip. When this transponder 14 receives a driving radio wave that is locally transmitted in the vicinity of an engine switch operated when the engine is started, an induced power is generated in its coil. Based on this power, the transponder 14 transmits a transponder response signal including its own ID code.

  Next, a configuration related to the wireless key system in the electronic key 10 will be described. In the wireless key system, the electronic key control unit 11 and the UHF transmission unit 13 are shared with the key operation free system.

The electronic key 10 includes an unlocking switch 16 and a locking switch 17.
The unlocking switch 16 and the locking switch 17 are operably disposed on the surface of the electronic key 10 and, when operated, output an operation signal indicating that to the electronic key control unit 11.

  When the electronic key control unit 11 receives an operation signal indicating that the unlocking switch 16 has been operated, the electronic key control unit 11 generates an unlocking request signal including an ID code requesting the unlocking of the vehicle door, and this is transmitted to the UHF transmission unit. 13 is output. The UHF transmission unit 13 modulates the unlock request signal input from the electronic key control unit 11 and transmits it as a UHF band radio signal via the transmission antenna 13a. Even when the electronic key control unit 11 receives an operation signal indicating that the locking switch 17 has been operated, the UHF transmission unit 13 sends a locking request signal including an ID code requesting locking of the door, as described above. Via wireless transmission.

<In-vehicle device>
Next, the configuration related to the key operation free system in the in-vehicle device 20 will be mainly described.
As shown in FIG. 1, the in-vehicle device 20 includes an in-vehicle control unit 21 configured by a computer unit, an out-of-vehicle transmission unit 22 that transmits an LF band radio signal to the outside of the vehicle, and an LF band radio signal in the vehicle. And a vehicle-mounted receiving unit 24 for receiving a UHF band radio signal transmitted from inside and outside the vehicle.

In addition, an engine switch 33, a door lock device 34, an engine device 35, and a lock switch 36 are electrically connected to the in-vehicle control unit 21.
The lock switch 36 is provided on a door handle on the outside of the vehicle and is pushed when the vehicle door is locked and unlocked. Then, the lock switch 36 outputs an operation signal indicating that it has been operated to the in-vehicle control unit 21.

  The engine switch 33 is provided in the vicinity of the driver's seat and is pushed when the engine is started. Then, the engine switch 33 outputs an operation signal indicating that it has been operated to the in-vehicle control unit 21.

The in-vehicle control unit 21 includes a nonvolatile memory 21a, and the same ID code as the ID code of the electronic key 10 is stored in the memory 21a.
When receiving the operation signal from the lock switch 36 or the engine switch 33, the in-vehicle control unit 21 generates a request signal and two RSSI measurement signals, and outputs them to the in-vehicle transmission unit 22 or the in-vehicle transmission unit 23.

  The outside transmission unit 22 is provided, for example, inside a door handle outside the vehicle. When the request signal and the two RSSI measurement signals are input from the in-vehicle control unit 21, the outside-vehicle transmission unit 22 modulates them and transmits them as LF band radio signals via the outside-vehicle transmission antenna 22a.

  The in-vehicle transmission unit 23 is provided in the vehicle. When the request signal and the two RSSI measurement signals are input from the in-vehicle control unit 21, the in-vehicle transmission unit 23 modulates them and transmits them to the inside of the vehicle via the in-vehicle transmission antenna 23a. The signal strengths of both RSSI measurement signals are set to differ by a certain value or more.

  When receiving the response signal transmitted from the electronic key 10 via the receiving antenna 24a, the in-vehicle receiving unit 24 demodulates this signal into a pulse signal and outputs it to the in-vehicle control unit 21.

The in-vehicle control unit 21 recognizes the detection result and ID code of the RSSI detection circuit 19 included in the response signal received through the in-vehicle reception unit 24.
The in-vehicle controller 21 determines that the communication is not unauthorized using a repeater when the RSSI difference between the two RSSI measurement signals, which is the detection result of the RSSI detection circuit 19, is equal to or greater than a certain value. Moreover, the vehicle-mounted control part 21 judges that it is an unauthorized communication using a repeater, when the difference of RSSI of both RSSI measurement signals is less than a fixed value. Here, even when the repeater receives two RSSI measurement signals having different signal strengths, the signal strength of the RSSI measurement signals transmitted to the electronic key 10 is the same. For this reason, when a repeater exists between the in-vehicle device 20 and the electronic key 10, the RSSI difference between both RSSI measurement signals is less than a certain value. This makes it possible to make the above determination.

  The in-vehicle control unit 21 performs wireless communication with the electronic key 10 when the engine switch 33 or the lock switch 36 is operated. And the vehicle-mounted control part 21 judges whether the said communication is unauthorized using a repeater. When the in-vehicle control unit 21 determines that the communication is not unauthorized using the repeater, the vehicle-mounted control unit 21 collates the ID code included in the response signal with the ID code stored in the memory 21a.

  The in-vehicle control unit 21 determines whether the vehicle exterior verification or the vehicle interior verification is performed based on whether the response signal transmitted from the electronic key 10 is a response to the request signal transmitted from the vehicle exterior transmission unit 22 or the vehicle interior transmission unit 23. It is determined which has been established. Verification outside the vehicle refers to verification of the ID code with the electronic key 10 existing outside the vehicle via the transmission unit 22 outside the vehicle. In-vehicle collation refers to collating an ID code with the electronic key 10 existing in the vehicle via the in-vehicle transmission unit 23.

  If the in-vehicle control unit 21 detects that the unauthorized communication using the repeater is not performed after detecting the operation of the lock switch 36 and further determines that the vehicle outside verification is established, the vehicle-mounted control unit 21 passes the vehicle via the door lock device 34. Switch the door lock / unlock state. On the other hand, when the vehicle-mounted control unit 21 determines that the communication is an unauthorized communication using a repeater, or when it is determined that the outside verification is not established, the vehicle-mounted control unit 21 restricts switching of the locking / unlocking state of the vehicle door.

  On the other hand, when the in-vehicle control unit 21 detects that the unauthorized communication using the repeater is not performed after detecting the operation of the engine switch 33 and further determines that the in-vehicle collation is established, the in-vehicle control unit 21 starts the engine through the engine device 35. . On the other hand, when it is determined that the in-vehicle collation is not established, the in-vehicle control unit 21 restricts the start of the engine. The in-vehicle control unit 21 shifts to the alert mode when it is determined that the communication accompanying the operation of the engine switch 33 is an unauthorized one using a repeater. In this alert mode, engine start through the key operation free system is restricted. In this example, the engine start state corresponds to the travel permission state.

  Next, the structure which concerns on the immobilizer system in the vehicle-mounted apparatus 20 is demonstrated. In the immobilizer system, the in-vehicle control unit 21 and the like are shared with the key operation free system.

  The in-vehicle device 20 includes an immobilizer communication device 25. The immobilizer communication device 25 is built in the engine switch 33. The vehicle-mounted control unit 21 outputs a command signal to the immobilizer communication device 25, for example, when the brake pedal is depressed while the engine is stopped. The immobilizer communication device 25 transmits a driving radio wave based on a command signal from the in-vehicle control unit 21. This driving radio wave is locally transmitted in the vicinity of the engine switch 33. When the electronic key 10 is held over the engine switch 33, the transponder 14 of the electronic key 10 is activated by receiving the driving radio wave. Then, the transponder 14 transmits a transponder response signal including the ID code. When receiving the transponder response signal, the immobilizer communication device 25 demodulates this signal into a pulse signal and outputs it to the in-vehicle control unit 21. The in-vehicle controller 21 collates the ID code included in the transponder response signal with the ID code stored in the memory 21a (transponder collation). The in-vehicle controller 21 starts the engine through the engine device 35 even in the alert mode when the transponder verification is established.

  Next, the structure which concerns on the wireless key system in the vehicle-mounted apparatus 20 is demonstrated. In the wireless key system, the in-vehicle controller 21 and the in-vehicle receiver 24 are shared with the key operation free system.

  The in-vehicle receiver 24 demodulates the unlock request signal or the lock request signal received through its own receiving antenna 24 a and outputs it to the in-vehicle controller 21. When the in-vehicle controller 21 recognizes the unlock request signal from the in-vehicle receiver 24, the in-vehicle controller 21 collates the ID code included in the unlock request signal with the ID code stored in the memory 21a (wireless verification). The in-vehicle control unit 21 unlocks the vehicle door when determining that the wireless verification is established. The in-vehicle control unit 21 locks the vehicle door when determining that the wireless verification for the ID code included in the locking request signal is established. On the other hand, the vehicle-mounted control unit 21 does not switch the locking / unlocking state of the vehicle door when determining that the wireless verification is not established.

  Moreover, the vehicle-mounted control part 21 will cancel | release the mode, if wireless collation is materialized in alert mode. Thereby, the engine can be started through the key operation free system.

  In each of the above electronic key systems, the key operation free system is highly convenient because the user does not need to perform key operations. However, in this system, there is a concern about unauthorized communication using a repeater that establishes out-of-vehicle and in-vehicle verification even though the electronic key 10 is far from the vehicle. Specifically, the repeater receives the request signal at its first transmission / reception unit. The signal is transmitted from a second transmission / reception unit located away from the first transmission / reception unit through a cable. By transmitting the request signal from the second transmission / reception unit to the electronic key 10 possessed by the user away from the vehicle, the electronic key 10 returns a response signal. This response signal is transmitted to the in-vehicle device 20 via a repeater or directly. As a result, the in-vehicle / outside-vehicle verification is established in the in-vehicle device 20, and there is a possibility that the vehicle door is unlocked and the engine is illegally started.

  Unauthorized communication using the repeater is not likely to be performed in the wireless key system. In this system, when the unlock request signal or the lock request signal is transmitted with the operation of the unlock switch 16 or the lock switch 17 as a trigger, the user's intention is transmitted through the request signal as in the key operation free system. This is because no signal can be transmitted from the electronic key 10.

  In addition, unauthorized communication using a repeater is not likely to be performed in the immobilizer system. This is because the driving radio wave and the transponder response signal are transmitted locally and cannot be relayed.

  When it is determined that the communication is unauthorized using the repeater, the warning mode is entered and the engine start through the key operation free system is restricted. This prevents the engine from being started through unauthorized communication using a repeater, thus improving security. Even if it is determined that the communication is unauthorized using the repeater, the engine can be started through the immobilizer system. It is also possible to cancel the warning mode through the wireless key system. Thereby, a user's convenience can be improved.

Next, the processing procedure of the in-vehicle control unit 21 will be described with reference to the flowchart of FIG. This flowchart is started when the engine switch 33 is operated.
When the engine switch 33 is operated, a request signal and two RSSI measurement signals are transmitted (S101). When a response signal corresponding to the request signal is received (S102), it is determined based on the detection result of the RSSI detection circuit 19 included in the response signal whether the communication is unauthorized communication using a repeater (S103). ). When it is determined that the communication is not unauthorized using the repeater (NO in S103), whether or not in-vehicle verification is established through verification of the ID code included in the response signal and the ID code stored in the memory 21a. Determination is made (S104). When it is determined that the in-vehicle verification is established (YES in S104), the engine is started assuming that the communication target is the regular electronic key 10. When it is determined that the in-vehicle verification is not established (NO in S104), it is determined that the communication target is not the regular electronic key 10, and the flowchart is ended without starting the engine.

  When it is determined that the communication is illegal using the repeater (YES in S103), the mode is shifted to a warning mode (S106). Then, it is determined whether or not the transponder verification is established (S107). If it is determined that transponder verification is established (YES in S107), the engine is started (S105). This completes the flowchart. If it is determined that transponder verification is not established (NO in S107), it is determined whether wireless verification is established (S108). If it is determined that the wireless verification is not established (NO in S108), the flowchart is ended without starting the engine. When it is determined that wireless verification is established (YES in S108), in other words, when the unlocking switch 16 or the locking switch 17 is operated in the alert mode, the alert mode is canceled (S109). Then, when the process proceeds to step S104 and it is determined that the in-vehicle collation is established, the engine is started. This completes the flowchart.

As described above, according to the embodiment described above, the following effects can be obtained.
(1) When the in-vehicle device 20 determines that the communication is an unauthorized communication using a repeater, the on-vehicle device 20 regulates starting the engine through the key operation free system. As a result, the engine can be prevented from starting through unauthorized communication using a repeater, and the security can be further improved.

  (2) Even when it is determined that the communication is unauthorized using the repeater, the engine is started when the ID code verification in the immobilizer system is performed without fear of the unauthorized communication. Thereby, even in the alert mode, the engine can be started while ensuring security.

  (3) In the alert mode, when the wireless verification is established, the alert mode is canceled because it is not an unauthorized communication using the repeater. In this case, the in-vehicle device 20 starts the engine when the ID code verification in the key operation free system is established. As a result, even if the mode is shifted to the alert mode due to an erroneous determination that the communication is illegal using the repeater, the engine is started through the key operation free system by releasing the mode. be able to. Therefore, convenience can be improved.

In addition, the said embodiment can be implemented with the following forms which changed this suitably.
In the above embodiment, when the mode is shifted to the alert mode (S106) or when the mode is canceled (S109), the fact may be notified to the user through, for example, an indicator or voice. Thereby, for example, the user can recognize that it has shifted to the alert mode and can perform transponder verification or wireless verification.

  -In above-mentioned embodiment, when warning mode was canceled through establishment of wireless collation, the engine was started on condition that establishment of in-vehicle collation. However, when wireless verification is established (YES in S108), the engine may be started without performing in-vehicle verification in step S104 (S105). At this time, the process of canceling the alert mode may be omitted.

  -In above-mentioned embodiment, the vehicle-mounted control part 21 judged whether it was an unauthorized communication which used the repeater as a judgment part. However, the electronic key control unit 11 may make this determination as a determination unit. In this case, the electronic key control unit 11 transmits the determination result included in, for example, a response signal. The in-vehicle control unit 21 determines whether or not the communication is unauthorized using the repeater based on the determination result included in the response signal (S103).

  Further, two RSSI measurement signals may be transmitted from the electronic key 10 to the in-vehicle device 20. Even in this case, it is possible to determine whether or not the communication is unauthorized using the repeater based on the RSSI difference between the RSSI measurement signals as in the above embodiment. In this configuration, the RSSI detection circuit 19 is provided in the in-vehicle receiving unit 24.

  In the above embodiment, two RSSI measurement signals are transmitted separately from the request signal. However, request signals having different signal strengths may be transmitted twice in succession. In this case, as in the case of the RSSI measurement signal, the in-vehicle controller 21 determines whether or not the communication is an unauthorized communication using a repeater based on the RSSI difference between the request signals.

  -Furthermore, the determination method of whether it is an unauthorized communication using a repeater is not restricted to the method based on RSSI of a radio signal. For example, it may be determined whether or not the communication is illegal using the repeater through a delay in the reception timing of the response signal by interposing the repeater. In this case, the in-vehicle device 20 includes a timer, and measures the time from when the request signal is transmitted to when the response signal is received through the timer. When the measured time exceeds a certain time, the in-vehicle device 20 determines that the communication is unauthorized using the repeater. Here, the fixed time is set based on the time required for wireless communication between the electronic key 10 and the in-vehicle device 20 when no repeater is interposed.

  In the above embodiment, the alert mode is canceled when the lock switch 17 or the unlock switch 16 is operated. However, a switch for releasing the warning mode may be provided on the electronic key 10. In this case, when the switch is operated, a radio signal is transmitted from the electronic key 10 to request cancellation of the warning mode including the ID code. When the verification of the ID code included in the wireless signal is established, the in-vehicle device 20 cancels the alert mode.

  In the above embodiment, the order of both steps S103 and S104 may be reversed. In this configuration, when in-vehicle verification is not established, it is possible to omit determination as to whether or not the communication is unauthorized using a repeater.

  In the above embodiment, when it is determined that the in-vehicle verification is not established (NO in S104), it may be determined whether or not the transponder verification is established as indicated by the broken line in FIG. 2 (S201). If it is determined that the transponder verification is established (YES in S201), the engine is started (S105). On the other hand, if it is determined that the transponder verification is not established (NO in S201), the flowchart is ended without starting the engine.

  In the above embodiment, when it is determined that wireless verification is established (YES in S108), it is determined whether or not in-vehicle verification is established (S104) after the warning mode is canceled (S109). . However, when wireless verification is established, the engine may be started without performing in-vehicle verification.

  In the above embodiment, a request signal or the like is transmitted when the engine switch 33 or the lock switch 36 is operated. However, the request signal or the like may be transmitted at regular intervals. In this case, the flowchart of FIG. 2 is started when a request signal or the like is transmitted (S101). And the vehicle-mounted control part 21 will be in an engine starting permission state, when vehicle collation or transponder collation is materialized (it is YES at S104, S107, or S201). When the engine switch 33 is operated in this state, the engine is started. In this configuration, the engine start permission state corresponds to the travel permission state.

  In the above embodiment, for example, the engine may be configured to be started through a mechanical key housed in the main body of the electronic key 10. Here, when the engine is started through the mechanical key, wireless communication is not used in the first place, and there is no possibility of unauthorized communication using a repeater. Therefore, the engine start through the mechanical key may be permitted even in the alert mode. Specifically, the mechanical key is inserted into a key cylinder (not shown) provided in the steering column, and the mechanical key is rotated in that state. Thereby, the engine can be started.

  In the above embodiment, the alert mode is canceled when the wireless verification is established. However, the alert mode may be canceled when not only wireless verification but biometric authentication such as fingerprint authentication is established, for example. Further, the engine may be started when this biometric authentication is established.

The wireless key system in the above embodiment may be omitted.
-Furthermore, the immobilizer system may be omitted. Even in this case, it is possible to improve the security as in the above embodiment by restricting the start of the engine when it is determined that the communication is unauthorized using the repeater.

  -The vehicle in the said embodiment may be any of a gasoline vehicle, a hybrid vehicle, and an electric vehicle.

  DESCRIPTION OF SYMBOLS 1 ... Electronic key system, 2 ... Vehicle, 10 ... Electronic key, 11 ... Electronic key control part, 14 ... Transponder, 20 ... In-vehicle apparatus, 21 ... In-vehicle control part (determination part), 25 ... Immobilizer communication apparatus.

Claims (2)

When the electronic key receives a request signal transmitted from the in-vehicle device to the inside / outside of the vehicle, the electronic key transmits a response signal including an ID code, and the in-vehicle device collates the ID code included in the received response signal. In an electronic key system with
A determination unit that determines whether wireless communication through the request signal and the response signal between the electronic key and the in-vehicle device is unauthorized communication using a relay;
When it is determined through the determination unit that the communication is not unauthorized using the repeater, the in-vehicle device sets the vehicle to a travel-permitted state on condition that the ID code verification is established, and the relay unit is switched through the determination unit. When it is determined that the unauthorized communication is used, the mode is shifted to a warning mode, and the travel permission state is restricted regardless of the success or failure of the verification of the ID code ,
When the electronic key receives a drive signal locally transmitted from the in-vehicle device, the electronic key also locally transmits a transponder response signal including an ID code, and the in-vehicle device transmits an ID code included in the received transponder response signal. Equipped with an immobilizer system for verification
The on-vehicle device is an electronic key system that places the vehicle in a travel-permitted state when the ID code verification in the immobilizer system is established in the alert mode . The electronic key system according to claim 1 .
A wireless key system in which a control request signal including an ID code is transmitted from the electronic key based on an operation of a switch provided in the electronic key, and the in-vehicle device collates the ID code included in the received control request signal. Prepared,
In the warning mode, the in-vehicle device cancels the warning mode when ID code verification in the wireless key system is established, and sets the vehicle in a travel-permitted state when ID code verification in the key operation-free system is established. Electronic key system to do.

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