JP6323298B2 - Electronic key system and portable device - Google Patents

Description

  The present invention relates to an electronic key system and a portable device included in the electronic key system.

  2. Description of the Related Art Conventionally, there is known an electronic key system that enables vehicle control such as locking / unlocking of a vehicle door and starting of an engine based on the fact that code verification by wireless communication is established between an in-vehicle device and a portable device. Since the distance range in which this wireless communication is possible is limited to a short distance around the vehicle, the code verification between the in-vehicle device and the portable device is usually performed when the portable device is located in the vicinity of the vehicle. Only possible.

  However, in such an electronic key system, there is a concern that a malicious third party may perform relay attack that establishes code verification by indirectly realizing communication between the portable device and the in-vehicle device using a repeater. ing. In the relay attack, the code verification is established to enable vehicle control such as unlocking of the vehicle door and starting of the engine, although the legitimate user does not intend.

  On the other hand, the movement of the portable device detected by the acceleration sensor provided in the portable device is added to the conditions for enabling unlocking of the vehicle door, engine starting, etc., thereby improving the security of the electronic key system. Improvement techniques have been proposed.

  For example, Patent Document 1 is based on the fact that the code verification by wireless communication between the portable device and the in-vehicle device is established, and that the vehicle door is closed when it is detected that the vehicle door is closed. A technique for permitting engine start on condition that vibration is detected by a portable device is disclosed.

  Further, in Patent Document 2, the first condition for determining that there is a movement of the portable device associated with getting on after the outside verification by wireless communication is established, and the portable device is stationary when the indoor verification by wireless communication is established. Only when the second condition determined to be satisfied is satisfied, a technique for determining that the authorized user is in the vehicle and allowing the engine to start is disclosed.

JP 2014-91434 A JP 2010-274682 A

  However, in the technique disclosed in Patent Document 1, since the portable device of the electronic key system is often kept in a bag or pocket when getting on, the vibration based on the closing of the vehicle door is accurately detected. It was difficult to do. Therefore, even if the user is carrying the portable device, there is a problem that vibration based on the closing of the vehicle door cannot be detected by the portable device and the engine start may not be permitted.

  Further, in the technology disclosed in Patent Document 2, since engine start is not permitted unless it is determined that the portable device is stationary when the indoor verification by wireless communication is established, the user vibrates the portable device unintentionally. If this is done, there is a problem that even an authorized user is not allowed to start the engine.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to improve security while avoiding a problem that vehicle control is not permitted when a legitimate user uses the vehicle. It is an object of the present invention to provide an electronic key system and a portable device that make it possible.

The electronic key system of the present invention is mounted on a vehicle and includes an in-vehicle device (11) including a transmission processing unit (111) that transmits a request signal by short-range wireless communication, and is carried by a user and responds to a request signal. And a portable device (2) including a reply unit (23) capable of transmitting a response signal, and the in-vehicle device includes an identification code for identifying the portable device in the response signal transmitted from the reply unit. An electronic key system including permission units (117, 118) for permitting control of a vehicle based on establishment of code verification using the identification code, wherein the portable device includes a position specifying unit that specifies whether the position to any of (213), a mobile identification unit the portable device to identify whether it is carried by the user and (215), the movement of the portable device A sensor (24) for detecting a physical quantity occurring already there when the portable device is identified to be located in the passenger compartment of the vehicle position specifying unit, provided with a sensor stop unit stopping sensor and (214), a mobile identification unit Specifies whether or not the portable device is carried by the user based on the physical quantity detected by the sensor, and the reply unit specifies that the portable device is located outside the vehicle compartment in the position specifying unit And when the portable specific | specification part specifies that the portable machine is not carried by the user, the response signal with respect to a request signal is not transmitted.

The portable device of the present invention is an electronic device that permits vehicle control based on the fact that code verification using wireless communication is established between an in-vehicle device mounted on a vehicle and a portable device carried by a user. A portable device including a reply unit (23) used in a key system and capable of transmitting a response signal to a request signal transmitted from a vehicle-mounted device through short-range wireless communication. A position specifying unit (213) that specifies where the mobile device is located, a mobile specifying unit (215) that specifies whether or not the portable device is carried by the user, and a sensor that detects a physical quantity that is caused by the movement of the mobile device and (24), when the portable device is identified to be located in the passenger compartment of the vehicle position specifying unit, provided with a sensor stop unit stopping sensor and (214), the portable identification unit detects the sensor Based on the amount, the portable device is identified whether it is carried by the user, the reply unit, portable device even if you are identified as being located outside the passenger compartment of the vehicle position specifying unit, and, When the portable identification unit identifies that the portable device is not carried by the user, a response signal to the request signal is not transmitted.

  According to these configurations, the position specifying unit specifies that the portable device is located outside the vehicle compartment of the vehicle, and the portable specifying unit specifies that the portable device is not carried by the user. In this case, a response signal for the request signal is not transmitted. That is, when the portable device is not carried by the user outside the vehicle compartment, a response signal for the request signal is not transmitted. Therefore, for example, when the portable device is not carried by the user outside the passenger compartment, such as after the user returns home and places the portable device, even if a relay attack using a relay device is attempted, No response signal is returned from the machine, and code verification is not performed between the in-vehicle device and the portable device. Accordingly, it is possible to improve security without permitting vehicle control based on the establishment of code verification.

  In addition, as described above, since it is possible to improve security without adding the movement of the portable device when using the vehicle to the conditions for permitting control of the vehicle, the movement of the portable device when using the vehicle is improved. Need not be added to the conditions for permitting control of the vehicle. Therefore, it is possible to avoid the problem that the vehicle control is not permitted when the legitimate user uses the vehicle, which occurs when the movement of the portable device when the vehicle is used is added to the condition for permitting the vehicle control. . As a result, it is possible to improve security while avoiding the problem that vehicle control is not permitted when a legitimate user uses the vehicle.

1 is a diagram illustrating an example of a schematic configuration of an electronic key system 100. FIG. 2 is a block diagram illustrating an example of a schematic configuration of a vehicle-side unit 1. FIG. It is a block diagram which shows an example of schematic structure of collation ECU11. 3 is a block diagram illustrating an example of a schematic configuration of a portable device 2. FIG. 3 is a block diagram illustrating an example of a schematic configuration of a portable side control unit 21. FIG. It is a sequence diagram which shows an example of the flow of the exchange of the signal by near field communication between collation ECU11 and the portable device 2. FIG. It is a flowchart which shows an example of the flow of the smart related process at the time of boarding in collation ECU11. It is a flowchart which shows an example of the flow of the smart related process at the time of getting off in collation ECU11. 10 is a flowchart illustrating an example of a flow of mobile-side smart-related processing in the mobile-side control unit 21.

(Embodiment 1)
<Schematic Configuration of Electronic Key System 100>
FIG. 1 is a diagram showing an example of a schematic configuration of an electronic key system 100 to which the present invention is applied. As shown in FIG. 1, an electronic key system 100 includes a vehicle-side unit 1 mounted on a vehicle and a portable device 2 as an electronic key carried by a user. The vehicle members appearing in the following description are all vehicle members.

  The electronic key system 100 has a so-called smart function. The smart function refers to a function that performs code collation by short-range wireless communication between the vehicle-side unit 1 and the portable device 2, and when the code collation is established, locks / unlocks the vehicle door and permits engine start. ing. Further, the electronic key system 100 also has a so-called remote keyless entry function that executes locking / unlocking control of the vehicle door according to the operation of the switch of the portable device 2.

<Schematic configuration of vehicle-side unit 1>
First, the schematic configuration of the vehicle-side unit 1 will be described with reference to FIG. FIG. 2 is a block diagram illustrating a schematic configuration of the vehicle-side unit 1. As shown in FIG. 2, the vehicle-side unit 1 includes a verification ECU 11, an LF transmitter 12, a UHF receiver 13, door antennas 14 a to 14 d, an indoor antenna 15, an antenna outside a trunk 16, a body ECU 17, and an engine ECU 18. . In addition, collation ECU11 is equivalent to the vehicle-mounted apparatus of a claim.

  The LF transmission unit 12 transmits a request signal by radio waves in the LF band to the portable device 2 via LF antennas such as the door antennas 14 a to 14 d, the indoor antenna 15, and the trunk outside antenna 16. The LF band is a frequency band of 30 kHz to 300 kHz, for example. The range in which signals can be transmitted from the LF antenna using radio waves in the LF band corresponds to the short-range wireless communication area in which short-range wireless communication is possible. The request signal is a signal that requests transmission of the identification code of the portable device 2 for code verification.

  The door antenna 14a is provided near the vehicle door of the driver seat, the door antenna 14b is provided near the vehicle door on the passenger seat side, the door antenna 14c is provided near the vehicle door on the right side of the rear seat, and the door antenna 14d. Is provided near the vehicle door on the left side of the rear seat. The indoor antenna 15 is provided in the vehicle interior, and the outside trunk antenna 16 is provided in the vicinity of the trunk room door in the vehicle door.

  The short-distance wireless communication area of the door antenna 14a is limited to the vicinity of the vehicle door of the driver seat, the short-range wireless communication area of the door antenna 14b is limited to the vicinity of the vehicle door of the passenger seat side, and the door antenna 14c. The short-range wireless communication area is limited to the vicinity of the vehicle door on the right side of the rear seat, and the short-range wireless communication area of the door antenna 14d is limited to the vicinity of the vehicle door on the left side of the rear seat. Further, the short-range wireless communication area of the indoor antenna 15 is limited to the vehicle interior, and the short-range wireless communication area of the antenna 16 outside the trunk is limited to the vicinity of the trunk room door.

  The UHF receiving unit 13 has a UHF antenna, and receives a response signal transmitted from the portable device 2 using a radio wave in the UHF band by the UHF antenna. The UHF band is a frequency band of 300 MHz to 3 GHz, for example. The response signal is a signal returned from the portable device 2 in response to the request signal.

  The body ECU 17 locks and unlocks each vehicle door by outputting a drive signal for controlling locking and unlocking of each vehicle door to a door lock motor provided in each vehicle door. The body ECU 17 is connected to a touch sensor provided on the outer door handle of each vehicle door, and detects that the outer door handle of each vehicle door has been touched by the user. In addition, a courtesy switch for each vehicle door is connected to the body ECU 17 to detect opening and closing of each vehicle door.

  When the engine ECU 18 acquires the engine start permission signal from the verification ECU 11, the engine ECU 18 enters an engine start standby state in which the starter motor or the like can be started. The engine ECU 18 controls the amount of fuel supplied to the engine, ignition timing, and the like.

  The verification ECU 11 is mainly configured by a microcomputer including a CPU, a memory such as a ROM and a RAM, and an I / O, and executes various processes by executing a control program stored in the ROM. For example, the verification ECU 11 executes a process related to a smart function when getting on, a process related to a smart function when getting off, a process related to a smart function when getting off, a process related to a remote keyless entry function, and the like. Note that some or all of the functions executed by the verification ECU 11 may be configured in hardware by one or a plurality of ICs.

<Detailed Configuration of Verification ECU 11>
As shown in FIG. 3, the verification ECU 11 includes a transmission processing unit 111, a reception processing unit 112, an open / close determination unit 113, a registration unit 114, a verification unit 115, a vehicle interior / exterior determination unit 116, a locking / unlocking permission unit 117, and a start permission. Part 118 is provided.

  The transmission processing unit 111 transmits a request signal including a vehicle identification code, which is a code for identifying a vehicle, from the door antennas 14 a to 14 d, the indoor antenna 15, and the trunk outside antenna 16 via the LF transmission unit 12. The transmission processing unit 111 corresponds to an out-of-vehicle transmission processing unit. The vehicle identification code may be the device ID of the verification ECU 11 mounted on the vehicle or the vehicle ID of the vehicle. What is necessary is just to set it as the structure which reads and uses what was stored in the non-volatile memory of collation ECU11 for vehicle identification code.

  The reception processing unit 112 receives a response signal transmitted from the portable device 2 in the UHF band in response to the request signal via the UHF receiving unit 13. The opening / closing determination unit 113 determines opening / closing of the vehicle door from the result of detecting the opening / closing of the vehicle door by the body ECU 17.

  The registration unit 114 is, for example, an electrically rewritable non-volatile memory, and the portable device identification code of the legitimate user's portable device 2 is included in the portable device identification code that is a code for identifying the portable device 2. It is registered.

  The collation unit 115 performs code collation to check whether the portable device 2 that is the transmission source of the response signal received by the reception processing unit 112 is the portable device 2 of the authorized user. The code verification is performed between the portable device identification code included in the response signal received from the portable device 2 and the portable device identification code registered in the registration unit 114.

  The vehicle interior / exterior determination unit 116 determines whether the portable device 2 is located outside or inside the vehicle interior. As an example, since a response signal is received from the portable device 2 when a request signal is transmitted from the indoor antenna 15, it is determined that the portable device 2 is located in the vehicle interior. On the other hand, when a request signal is transmitted from any one of the door antennas 14 a to 14 d and the antenna outside the trunk 16, a response signal is received from the portable device 2, but when a request signal is transmitted from the indoor antenna 15, the portable device 2 is received. Since the response signal is not received from the mobile phone 2, it is determined that the portable device 2 is located outside the vehicle compartment.

  In addition, when the transmission processing unit 111 determines whether the portable device 2 is located outside or inside the vehicle interior by the vehicle interior / exterior determination unit 116, the transmission processing unit 111 transmits the request signal when the portable device 2 transmits the request signal. The portable device position information indicating where the mobile device is located is included in this request signal and transmitted.

  The locking / unlocking permission unit 117 sends a signal permitting locking / unlocking of each vehicle door to the body ECU 17. When the locking / unlocking of each vehicle door is permitted, the body ECU 17 starts energization to the touch sensor provided on the outer door handle of each vehicle door, and enters a standby state in which the user can detect the door handle operation. When the body ECU 17 detects that the user has touched the touch sensor, the body ECU 17 outputs a drive signal to the door lock motor to lock and unlock each vehicle door.

  The start permission unit 119 sends an engine start permission signal to the engine ECU 18. The engine ECU 18 that has acquired the engine start permission signal puts the engine into the engine start standby state as described above. The locking / unlocking permission unit 117 and the start permission unit 118 correspond to a permission unit in the claims.

<Schematic configuration of portable device 2>
Next, the portable device 2 will be described with reference to FIG. As shown in FIG. 4, the portable device 2 includes a portable side control unit 21, an LF reception unit 22, a UHF transmission unit 23, an acceleration sensor 24, a push switch 25, and a push switch 26.

  The LF receiving unit 22 receives a request signal transmitted from the vehicle-side unit 1 using LF band radio waves via the LF antenna. The UHF transmission unit 23 transmits the signal output from the control IC 11 on a UHF band radio wave from the UHF antenna. The UHF transmission unit 23 corresponds to a reply unit in the claims.

  The acceleration sensor 24 detects acceleration generated by the movement of the portable device 2. The acceleration sensor 24 corresponds to the sensor in the claims, and the acceleration corresponds to the physical quantity in the claims. As an example, the acceleration sensor 24 may be a triaxial acceleration sensor, but may be configured to use a biaxial acceleration sensor or less.

  The push switches 25 and 26 are switches for mainly using the remote keyless entry function. When the push switch 25 is operated by one push, the vehicle door is locked. When the push switch 26 is operated by one push, the vehicle door is unlocked.

  The mobile-side control unit 21 is a microcomputer including a CPU, a memory such as a ROM and a RAM, an I / O, and the like, and executes various processes by executing various control programs stored in the ROM. For example, the mobile-side control unit 21 executes mobile-side smart-related processing related to the smart function and processing related to the remote keyless entry function. Note that some or all of the functions executed by the portable control unit 21 may be configured in hardware by one or a plurality of ICs.

<Schematic configuration of portable control unit 21>
As shown in FIG. 5, the mobile side control unit 21 includes a registration unit 211, a collation unit 212, a position specifying unit 213, a sensor control unit 214, a mobile specifying unit 215, and a sleep control unit 216.

  The registration unit 211 is, for example, an electrically rewritable non-volatile memory, in which a vehicle identification code of the verification ECU 11 mounted on a legitimate user's vehicle is registered. The verification unit 212 performs code verification to determine whether the vehicle on which the vehicle-side unit 1 that is the transmission source of the request signal received by the LF reception unit 22 is a legitimate user's vehicle. The code verification is performed between the vehicle identification code included in the request signal received from the vehicle-side unit 1 and the vehicle identification code registered in the registration unit 211.

  When the request signal received from the vehicle-side unit 1 includes portable device position information, the position specifying unit 213 specifies whether the portable device 2 is located outside or inside the vehicle interior according to the portable device position information. To do. Specifically, in the case of portable device position information indicating that the portable device 2 is located in the vehicle interior, the portable device 2 is identified as being located in the vehicle interior, and the portable device 2 is located outside the vehicle compartment. If the mobile device position information indicates that the mobile device 2 is located outside the vehicle compartment, the mobile device 2 is identified.

  The sensor control unit 214 stops the acceleration sensor 24 when the position specifying unit 213 specifies that the portable device 2 is located in the vehicle interior. The sensor control unit 214 corresponds to a sensor stop unit in claims. As an example, the acceleration sensor 24 may be stopped by stopping the power supply to the acceleration sensor 24. When the acceleration sensor 24 is stopped, the acceleration sensor 24 does not detect acceleration. The sensor control unit 214 does not stop the acceleration sensor 24 when the position specifying unit 213 specifies that the portable device 2 is located outside the vehicle compartment.

  The portable identifying unit 215 identifies whether the portable device 2 is carried by the user based on the acceleration detected by the acceleration sensor 24. As an example, when an acceleration equal to or greater than a threshold is detected, the portable device 2 is identified as being carried by the user, and when the acceleration equal to or greater than the threshold cannot be detected for a certain period of time, the portable device 2 is carried by the user. It may be specified that it is not. In other words, the state in which the portable device 2 is not carried by the user is a state in which the portable device 2 is placed on a stationary object and is stationary.

  The sleep control unit 216 specifies that the position specifying unit 213 specifies that the portable device 2 is located outside the vehicle compartment, and the portable specifying unit 215 specifies that the portable device 2 is not carried by the user. If it is, the LF receiver 22 is shifted to the sleep state. As an example, the LF reception unit 22 may be shifted to the sleep state by stopping the power supply to the LF reception unit 22. The LF receiver 22 that has shifted to the sleep state does not receive the request signal.

  In addition, when the portable identification unit 215 identifies that the portable device 2 is being carried by the user, the sleep control unit 216 causes the LF reception unit 22 to transition to the wake-up state. As an example, the power supply to the LF receiving unit 22 may be started to shift the LF receiving unit 22 to the wake-up state. The LF receiver 22 that has shifted to the wake-up state enters a reception waiting state in which a request signal can be received.

  When the sleep control unit 216 shifts the LF reception unit 22 to the sleep state, the sleep control unit 216 shifts the functions of the portable side control unit 21 excluding the portable identification unit 215 to the sleep state, and puts the LF reception unit 22 into the wake-up state. It is good also as a structure which transfers to a wake-up state when making it transfer to.

<Regarding the exchange of signals between the verification ECU 11 and the portable device 2>
Here, an example of a flow of signal exchange between the verification ECU 11 and the portable device 2 by short-range wireless communication will be described using the sequence diagram of FIG. 6. In FIG. 6, the description will be made assuming that the portable device 2 of the authorized user is located in the short-range wireless communication area of the vehicle-side unit 1 mounted on the authorized user's vehicle.

  First, the transmission processing unit 111 of the verification ECU 11 transmits a request signal via the LF transmission unit 12 (t1). That is, wireless polling is performed. This request signal includes the vehicle identification code held by the verification ECU 11. The request signals are transmitted in order from the LF antennas such as the door antennas 14a to 14d, the indoor antenna 15, and the trunk outside antenna 16.

  A configuration in which the request signal is not transmitted from the indoor antenna 15 until the vehicle door is opened by the smart function or the remote keyless entry function after the vehicle door is locked from outside the vehicle compartment by the smart function or the remote keyless entry function. And it is sufficient.

  The verification unit 212 of the portable device 2 that has received the request signal by the LF reception unit 22 performs code verification between the vehicle identification code included in the received request signal and the vehicle identification code registered in the registration unit 211. (T2). And if code collation is materialized, the response signal containing the portable device identification code of the portable device 2 will be transmitted from the UHF transmission part 23 (t3).

  The verification ECU 11 that has received the response signal by the reception processing unit 112 performs code verification between the portable device identification code included in the received response signal and the portable device identification code registered in the registration unit 114 (t4). .

  Moreover, the vehicle interior / exterior determination unit 116 of the verification ECU 11 determines whether the portable device 2 is located outside or inside the vehicle interior of the vehicle (t5). The determination as to whether the portable device 2 is located inside or outside the vehicle interior is a response when a request signal is transmitted from any of the LF antennas of the door antennas 14a to 14d, the indoor antenna 15, and the antenna outside the trunk 16, as described above. This is based on whether a signal is returned.

  Then, the transmission processing unit 111 of the verification ECU 11 performs wireless polling for transmitting a request signal via the LF transmission unit 12 (t6). This request signal includes the vehicle identification code held in the verification ECU 11 and the portable device position information obtained by the determination in the vehicle interior / exterior determination unit 116. The request signal may be transmitted only from the LF antenna corresponding to the short-range wireless communication area where the response signal is returned from the portable device 2.

  The verification unit 212 of the portable device 2 that has received the request signal by the LF reception unit 22 performs code verification between the vehicle identification code included in the received request signal and the vehicle identification code registered in the registration unit 211. (T7). And if code collation is materialized, the position specific | specification part 213 of the portable device 2 will identify whether the portable device 2 is located inside or outside the vehicle interior according to the portable device position information included in the received request signal (t8). .

  In FIG. 6, the request signal including the portable device position information is transmitted after the process of returning the response signal from the portable device 2 is performed once for the transmission of the request signal from the verification ECU 11. However, the present invention is not limited to this. For example, the request signal including the portable device position information may be transmitted after the process of returning the response signal from the portable device 2 is performed a plurality of times in response to the transmission of the request signal from the verification ECU 11.

<Smart-related processing when boarding in verification ECU 11>
Next, the boarding smart-related process executed in the verification ECU 11 when the vehicle door is unlocked by the smart function will be described with reference to the flowchart of FIG. The flowchart of FIG. 7 is started when the vehicle door is locked by the smart function, for example, and is repeatedly performed at a predetermined cycle, for example, every 250 msec until the vehicle door is unlocked and the engine is started.

  First, in step S1, outside vehicle verification is performed. In the verification outside the vehicle, the transmission processing unit 111 transmits a request signal to the short-range wireless communication area outside the vehicle compartment in order from the LF antennas such as the door antennas 14a to 14d and the antenna outside the trunk 16 via the LF transmission unit 12. When the response signal is returned from the portable device 2 in response to the request signal, the collation unit 115 includes the portable device identification code included in the response signal and the identification code registered in the registration unit 114. Is matched.

  If the vehicle outside verification is established (YES in S1), the process proceeds to step S2. On the other hand, when the response signal cannot be received or the portable device identification code does not match and the vehicle outside verification is not established (NO in S1), the boarding smart related processing is terminated.

  In step S <b> 2, the transmission processing unit 111 transmits a request signal including portable device position information obtained by the determination in the vehicle interior / exterior determination unit 116. Here, a request signal including portable device position information indicating that the portable device 2 is located outside the passenger compartment is transmitted.

  In step S3, the locking / unlocking permission unit 117 sends a signal permitting unlocking of each vehicle door to the body ECU 17, and permits unlocking of the vehicle door. When the body ECU 17 detects that the user has touched the touch sensor provided on the outer door handle in a state where the unlocking of the vehicle door is permitted, the body ECU 17 drives the door lock motor to unlock each vehicle door. I do.

  In step S4, the opening / closing determination unit 113 determines opening / closing of the vehicle door. If it is determined that the vehicle door has been opened / closed within a predetermined time from the unlocking (YES in S4), the process proceeds to step S5. On the other hand, the vehicle door has not been opened / closed within the predetermined time from the unlocking. Is determined (NO in S4), the boarding smart-related processing is terminated.

  In step S5, vehicle interior / exterior collation is performed. In the vehicle interior / exterior verification, the transmission processing unit 111 performs short-range wireless communication outside the vehicle interior and in the vehicle interior in order from the LF antennas such as the door antennas 14a to 14d, the indoor antenna 15 and the antenna outside the trunk 16 via the LF transmission unit 12. Send a request signal to the area. When the response signal is returned from the portable device 2 in response to the request signal, the collation unit 115 obtains the portable device identification code included in the response signal and the identification code registered in the registration unit 114. Collate.

  If the vehicle interior / exterior collation is established (YES in S5), the process proceeds to step S6. On the other hand, when the response signal cannot be received or the portable device identification code does not match and the vehicle interior / exterior collation is not established (NO in S5), the boarding smart related processing is terminated.

  In step S <b> 6, the transmission processing unit 111 transmits a request signal including portable device position information obtained by the determination in the vehicle interior / exterior determination unit 116. Here, a request signal including portable device position information indicating that the portable device 2 is located in the vehicle interior is transmitted.

  In step S7, when it determines with the vehicle interior / exterior determination part 116 that the portable device 2 is located in a vehicle interior (it is YES at S7), it moves to step S8. On the other hand, when it is determined that the portable device 2 is located outside the passenger compartment, the on-boarding smart related processing is terminated.

  In step S8, the start permission unit 118 sends an engine start permission signal to the engine ECU 18, permits engine start, and ends the on-boarding smart-related processing. In a state where the engine start is permitted, the engine ECU 18 starts the engine on condition that, for example, an engine switch or the like is turned on.

<Smart-related processing when getting off at the verification ECU 11>
Next, the getting-off smart related processing executed in the verification ECU 11 when the vehicle door is locked by the smart function will be described with reference to the flowchart of FIG. The flowchart of FIG. 8 is started when, for example, the ignition power of the vehicle is turned off, and is repeatedly executed at a predetermined cycle such as every 250 msec until the vehicle door is locked.

  First, in step S21, the opening / closing determining unit 113 determines whether the vehicle door is opened or closed. If it is determined that the vehicle door has been opened and closed within a certain time (YES in S21), the process proceeds to step S22. On the other hand, if it is determined that the vehicle door has not been opened and closed within a certain time (S21). In NO), the smart related processing at the time of getting off is terminated.

  In step S22, vehicle interior / exterior collation is performed in the same manner as S5 described above. If the vehicle interior / exterior collation is established (YES in S22), the process proceeds to step S23. On the other hand, when the vehicle interior / exterior verification is not established (NO in S22), the getting-off smart related processing is terminated.

  In step S <b> 23, the transmission processing unit 111 transmits a request signal including portable device position information obtained by the determination in the vehicle interior / exterior determination unit 116.

  In step S24, when the vehicle interior / exterior determination unit 116 determines that the portable device 2 is located outside the vehicle interior (YES in S24), the process proceeds to step S25. On the other hand, when it is determined that the portable device 2 is located in the vehicle interior, the smart-related processing at the time of getting off is terminated.

  In step S25, the locking / unlocking permission unit 117 sends a signal permitting the locking of each vehicle door to the body ECU 17, permits the locking of the vehicle door, and ends the smart-related process when getting off. When the body ECU 17 detects that the user has touched the touch sensor provided on the outer door handle in a state where the locking of the vehicle door is permitted, the body ECU 17 drives the door lock motor to lock each vehicle door. .

  Since the vehicle door is often locked by a one-push operation of the push switch 25 in the remote keyless entry function, the vehicle door is locked by a one-push operation of the push switch 25 in the remote keyless entry function. It is good.

<Mobile-side smart-related processing in the mobile-side control unit 21>
Subsequently, the mobile-side smart-related processing in the mobile-side control unit 21 will be described using the flowchart of FIG. The flowchart of FIG. 9 starts when, for example, power is supplied to the portable device 2, and ends when power is not supplied to the portable device 2.

  First, in step S41, when the request signal transmitted from the vehicle unit 1 is received by the LF receiver 22 (that is, polling reception) (YES in S41), the process proceeds to step S42. On the other hand, if polling reception has not been performed (NO in S41), the process of S41 is repeated.

  In step S <b> 42, the verification unit 212 performs code verification between the vehicle identification code included in the request signal received in S <b> 41 and the vehicle identification code registered in the registration unit 211. If the code verification is established (YES in S42), the process proceeds to step S43. On the other hand, if the code verification is not established (NO in S42), the process returns to S41 and is repeated.

  In step S <b> 43, a response signal including the portable device identification code of the portable device 2 is transmitted from the UHF transmission unit 23. In step S44, in the same manner as in S41, when polling is received (YES in S44), the process proceeds to step S45. On the other hand, if polling is not received (NO in S44), the process returns to S41 and is repeated.

  In step S45, based on the vehicle identification code included in the request signal received in S44, the verification unit 212 performs code verification in the same manner as in S42. If the code verification is established (YES in S45), the process proceeds to step S46. On the other hand, if the code verification is not established (NO in S45), the process returns to S41 and is repeated.

  In step S46, the position specifying unit 213 specifies whether the portable device 2 is located inside or outside the vehicle interior according to the portable device position information included in the request signal received in S44.

  In step S47, when the position specifying unit 213 specifies that the portable device 2 is located in the vehicle interior (YES in S47), the process proceeds to step S48. On the other hand, if the position specifying unit 213 specifies that the portable device 2 is located outside the passenger compartment (NO in S47), the process proceeds to step S57. In step S48, the sensor control unit 214 stops the acceleration sensor 24.

  If polling is received in step S49 (YES in S49), the process proceeds to step S50. On the other hand, if polling is not received (NO in S49), the process returns to S49 and is repeated.

  In step S50, based on the vehicle identification code included in the request signal received in S49, the verification unit 212 performs code verification in the same manner as in S42. If the code verification is established (YES in S50), the process proceeds to step S51. On the other hand, if the code verification is not established (NO in S50), the process returns to S49 and is repeated. In step S51, similarly to S43, a response signal including the portable device identification code of the portable device 2 is transmitted from the UHF transmitter 23.

  If polling is received in step S52 (YES in S52), the process proceeds to step S53. On the other hand, if polling is not received (NO in S52), the process returns to S49 and the process is repeated.

  In step S53, based on the vehicle identification code included in the request signal received in S52, the verification unit 212 performs code verification in the same manner as in S42. If the code verification is established (YES in S53), the process proceeds to step S54. On the other hand, if the code verification is not established (NO in S53), the process returns to S49 and is repeated.

  In step S54, the position specifying unit 213 specifies whether the portable device 2 is located inside or outside the vehicle interior according to the portable device position information included in the request signal received in S52.

  In step S55, if the position specifying unit 213 specifies that the portable device 2 is located outside the passenger compartment (YES in S55), the process proceeds to step S56. On the other hand, if the position specifying unit 213 specifies that the portable device 2 is located in the vehicle interior (NO in S55), the process returns to step S49 and the process is repeated. In step S56, the sensor control unit 214 releases the stop of the acceleration sensor 24.

  When the vehicle door is locked by a one-push operation of the push switch 25 in the remote keyless entry function, the position specifying unit 213 specifies that the portable device 2 is located outside the vehicle compartment, and the sensor control unit 214 detects the acceleration sensor. It is good also as a structure which cancels | releases 24 stops. According to this, the vehicle door is locked by a one-push operation of the push switch 25 in the remote keyless entry function, and when the portable device 2 is located outside the vehicle compartment from the portable device position information included in the request signal, the position specifying unit 213 Even if it cannot be specified, it can be specified that the portable device 2 is located outside the passenger compartment. Then, the stop of the acceleration sensor 24 of the portable device 2 that has moved out of the passenger compartment can be released.

  In step S57 when it is determined that the portable device 2 is located outside the passenger compartment in step S47, whether or not the portable device 2 is carried by the user based on the acceleration detected by the portable sensor 215 by the acceleration sensor 24. Is identified. If it is determined that the portable device 2 is carried by the user (YES in S57), the process proceeds to step S58. On the other hand, when it is specified that the portable device 2 is not carried by the user (NO in S57), the process proceeds to step S59.

  If polling is received in step S58 (YES in S58), the process returns to S42 and the process is repeated. On the other hand, when polling reception is not received (NO in S58), the process returns to S57 and is repeated.

  In step S59 when it is specified that the portable device 2 is not carried by the user in S57, the sleep control unit 216 shifts the LF reception unit 22 to the sleep state. In step S60, similarly to S57, it is specified whether or not the portable device 2 is carried by the user. If it is determined that the portable device 2 is carried by the user (YES in S60), the process proceeds to step S61. On the other hand, when it is specified that the portable device 2 is not carried by the user (NO in S60), the process of step S60 is repeated.

  In step S61, the sleep control unit 216 shifts the LF reception unit 22 to the wake-up state, and proceeds to S58.

<Summary of Embodiment 1>
According to the configuration of the first embodiment, the position specifying unit 213 specifies that the portable device 2 is located outside the vehicle compartment, and the portable specifying unit 215 indicates that the portable device 2 is not carried by the user. If specified, a response signal to the request signal is not transmitted. That is, when the portable device 2 is not carried by the user outside the passenger compartment, a response signal for the request signal is not transmitted. Therefore, for example, when the portable device 2 is not carried by the user outside the passenger compartment, such as after the user returns home and places the portable device 2, even if a relay attack using a relay device is attempted. The response signal is not returned from the portable device 2, and the code verification between the verification ECU 11 and the portable device 2 is not performed. Accordingly, it is possible to improve security without being locked or unlocked based on the establishment of the code verification or permission to start the engine.

  In addition, since it does not require conditions other than the establishment of code verification for permission of locking / unlocking and engine starting, the normal operation that occurs when the movement of the portable device 2 when using the vehicle is added to the conditions for permitting locking / unlocking and engine starting. It is possible to avoid the problem that locking / unlocking or engine start permission is not performed when the user uses the vehicle. As a result, it is possible to improve security while avoiding the problem that vehicle control is not permitted when a legitimate user uses the vehicle.

  In addition, the technique disclosed in Patent Document 1 has a problem in that the acceleration sensor constantly reacts to vibration generated by traveling while the vehicle is traveling, and there is a possibility that the battery of the portable device is wasted. However, such a problem does not occur in the configuration of the first embodiment. Specifically, according to the configuration of the first embodiment, when the position specifying unit 213 specifies that the portable device 2 is located in the vehicle interior, the acceleration sensor 24 of the portable device 2 is stopped. Therefore, the acceleration sensor 24 of the portable device 2 located in the vehicle interior does not react to vibration during travel of the vehicle, and can suppress wasteful battery consumption of the portable device 2.

  Here, the action and effect in the present invention will be described specifically by taking three scenes as examples. The first scene is when the user gets on the vehicle, the second scene is when the user only gets off the vehicle, and the third scene is when the user gets off the vehicle. is there.

  First, the scene when the user gets on the vehicle will be described. When the user is at home and the portable device 2 is placed on furniture or the like, the LF receiver 22 of the portable device 2 is in a sleep state. Therefore, even if a malicious third party attempts a relay attack using a repeater, no response signal is returned from the portable device 2, and the vehicle is not locked or unlocked or the engine is not permitted to start. .

  On the other hand, when the user carries the portable device 2, the LF receiver 22 of the portable device 2 enters a wake-up state. When the vehicle-side unit 1 mounted on the vehicle reaches the short-range wireless communication area, the LF reception unit 22 receives wireless polling from the vehicle-side unit 1 and returns a response signal from the UHF transmission unit 23. When code verification is established by the verification ECU 11 of the vehicle-side unit 1 that has received this response signal, the vehicle is allowed to be unlocked and unlocked, and when the user touches a touch sensor provided on the outer handle of the vehicle, the vehicle door is unlocked. .

  When the user gets into the vehicle, the acceleration sensor 24 of the portable device 2 stops. As a result, the acceleration sensor 24 does not react to vibrations while the vehicle is running, and wasteful battery consumption of the portable device 2 is suppressed.

  Then, the scene at the time of alighting from the vehicle only for a passenger of a user is described. When only the passenger of the user gets out of the vehicle, the user remains on the vehicle, so the portable device 2 is also located in the passenger compartment. Therefore, the acceleration sensor 24 of the portable device 2 remains stopped, and even when the vehicle resumes traveling, the acceleration sensor 24 does not react to vibration during traveling, and wasteful battery consumption of the portable device 2 is suppressed. It is done.

  Finally, the scene when the user gets off the vehicle will be described. When the user gets off the vehicle, the stop of the acceleration sensor 24 of the portable device 2 is released. Thereby, it becomes possible to specify whether or not the portable device 2 is carried by the user. When the user enters the home and places the portable device 2 on furniture or the like, the LF receiver 22 of the portable device 2 enters a sleep state. Therefore, even if a malicious third party attempts a relay attack using a repeater, no response signal is returned from the portable device 2, and the vehicle is not locked or unlocked or the engine is not permitted to start. .

(Modification 1)
In the first embodiment, the configuration has been described in which the response signal to the request signal is not transmitted by shifting the LF receiving unit 22 to the sleep state, but the configuration is not necessarily limited thereto. Other configurations may be adopted as long as the response signal for the request signal is not transmitted. For example, the UHF transmitter 23 may be shifted to a sleep state so that a response signal to the request signal is not transmitted.

(Modification 2)
In Embodiment 1, although the structure which performs code collation in any of portable machine 2 and collation ECU11 was shown, it does not necessarily restrict to this. For example, it is good also as a structure which does not perform code collation of the vehicle identification code in the portable device 2. In this case, the vehicle identification code is not included in the request signal transmitted from the verification ECU 11, and the registration unit 211 and the verification unit 212 may not be included in the mobile-side control unit 21 of the portable device 2.

(Modification 3)
In Embodiment 1, although the structure which uses the acceleration sensor 24 as a sensor which detects the physical quantity which arises with the motion of the portable device 2 was shown, it does not necessarily restrict to this. For example, another sensor such as a gyro sensor may be used as a sensor that detects a physical quantity that occurs with the movement of the portable device 2.

(Modification 4)
In Embodiment 1, although the structure which uses the acceleration sensor 24 as a sensor for specifying that the portable device 2 is carried by the user was shown, it does not necessarily restrict to this. For example, as a sensor for specifying that the portable device is carried by the user, another sensor such as an infrared sensor may be used. When an infrared sensor is used, as an example, the portable device 2 may be configured to include a plurality of infrared rays so that infrared rays are emitted from the portable device 2 in a plurality of directions. The number of directions in which infrared irradiation is blocked is equal to or greater than the number of directions in which infrared irradiation is blocked when the portable device 2 is placed on furniture or the like. What is necessary is just to set it as the structure which identifies what is carried out.

(Modification 5)
In the first embodiment, the configuration for permitting the engine start of the vehicle has been described, but the configuration is not necessarily limited thereto. For example, when applied to a vehicle using a motor such as a hybrid vehicle or an electric vehicle as a travel drive source, the motor may be permitted to start.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the technical means disclosed in different embodiments can be appropriately combined. Such embodiments are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Vehicle side unit, 2 Portable machine, 11 Collation ECU (vehicle equipment), 23 UHF transmission part (reply part), 100 Electronic key system, 111 Transmission processing part, 116 Car interior / exterior determination part, 117 Locking / unlocking permission part (permission Part), 118 start permission part (permission part), 213 position identification part, 214 sensor control part (sensor stop part), 215 portable identification part

Claims (4)

An in-vehicle device (11) that is mounted on a vehicle and includes a transmission processing unit (111) that transmits a request signal by short-range wireless communication;
A portable device (2) including a reply unit (23) that can be carried by the user and can transmit a response signal to the request signal;
The in-vehicle device is
When the response signal transmitted from the reply unit includes an identification code that identifies the portable device, a permission unit that permits control of the vehicle based on the fact that code verification using the identification code has been established. An electronic key system comprising (117, 118),
The portable device is
A position specifying unit (213) for specifying whether the portable device is located inside or outside the vehicle interior of the vehicle;
A portable identification unit (215) for identifying whether the portable device is carried by a user ;
A sensor (24) for detecting a physical quantity generated by the movement of the portable device;
A sensor stop unit (214) that stops the sensor when the position specifying unit specifies that the portable device is located in a vehicle interior of the vehicle ;
The portable identification unit identifies whether the portable device is carried by a user based on the physical quantity detected by the sensor,
The reply unit is a case where the position specifying unit specifies that the portable device is located outside the vehicle compartment of the vehicle, and the portable specifying unit specifies that the portable device is not carried by the user. If it is, the electronic key system does not transmit the response signal to the request signal. In claim 1,
The electronic key system characterized in that the reply unit can transmit the response signal to the request signal when the portable identifying unit identifies the portable device as being carried by a user. In claim 1 or 2,
The transmission processing unit has a case where the request signal is transmitted to the outside of the vehicle compartment by short-range wireless communication and a case where the request signal is transmitted to the vehicle interior of the vehicle by short-range wireless communication.
The in-vehicle device is
When the request signal is transmitted outside the passenger compartment of the vehicle by the transmission processor and when the request signal is transmitted into the passenger compartment of the vehicle by the transmission processor from the portable device A vehicle interior / exterior determination unit (116) for determining whether the portable device is located inside or outside the vehicle interior of the vehicle based on whether the response signal is received,
When the transmission processing unit determines whether the portable device is located inside or outside the vehicle in the vehicle, the portable device is configured to transmit the request signal. Mobile device position information indicating whether the vehicle is located inside or outside the vehicle is included in this request signal and transmitted.
The electronic key system, wherein the position specifying unit of the portable device specifies whether the portable device is located inside or outside the vehicle interior of the vehicle according to the portable device position information included in the request signal. . Used in an electronic key system that permits control of the vehicle based on the establishment of code verification using wireless communication between a vehicle-mounted device mounted on the vehicle and a portable device carried by the user, A portable device including a reply unit (23) capable of transmitting a response signal to a request signal transmitted by short-range wireless communication from a device,
A position specifying unit (213) for specifying whether the portable device is located inside or outside the vehicle interior of the vehicle;
A portable identification unit (215) for identifying whether the portable device is carried by a user ;
A sensor (24) for detecting a physical quantity generated by the movement of the portable device;
A sensor stop unit (214) that stops the sensor when the position specifying unit specifies that the portable device is located in a vehicle interior of the vehicle ;
The portable identification unit identifies whether the portable device is carried by a user based on the physical quantity detected by the sensor,
The reply unit is a case where the position specifying unit specifies that the portable device is located outside the vehicle compartment of the vehicle, and the portable specifying unit specifies that the portable device is not carried by the user. If so, the portable device does not transmit the response signal to the request signal.

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