JP6414696B2 - Key lock-in prevention device - Google Patents

Description

  The present invention relates to a vehicle key lock-in prevention device.

  A smart entry system (also called a smart key system) that realizes various functions in a vehicle by wireless communication between a key possessed by a user and an in-vehicle device mounted on the vehicle does not use a mechanical key. In addition, authentication can be performed by wireless communication between the key and the in-vehicle device, and operations desired by the user, such as unlocking the door and starting the engine, can be performed based on the authentication result. In addition, a lock prevention function is implemented to determine whether or not there is a key in the vehicle when the door is locked, and to prevent the key from being closed (the door is not locked and an alarm is issued).

  The current key lock-in prevention function operates at the time of locking operation from the outside of the vehicle. On the other hand, when locking from the inside of the vehicle, the locking operation is performed according to the user's intention, and the key lock-in prevention function is not operated (that is, locked). For this reason, for example, when the key and the infant are left in the passenger compartment with the engine started, if the infant is locked by mistake, a situation in which the unlocking cannot be performed from the outside occurs.

  Therefore, when a portable device exists in the room, a technique related to key lock-in prevention is disclosed in which when the indoor verification is established, the operation means is forcibly unlocked when operated according to the operation procedure ( Patent Document 1).

JP 2005-194799 A

  In the configuration of Patent Document 1, the door cannot be unlocked unless the operation procedure is remembered. In addition, if the operation procedure is simplified, there is a possibility that it can be learned and misused by a third party.

  In recent years, a system has been devised that improves convenience for users by linking a portable terminal typified by a smartphone and an in-vehicle device. Patent Document 1 does not disclose or suggest cooperation with a smartphone.

  Against the background of the above problems, an object of the present invention is to provide a key lock-in prevention device that improves user convenience without performing complicated operations.

  A key lock-in prevention device for solving the above problem includes an in-vehicle device mounted on a vehicle, a vehicle key carried by the user, and a portable terminal carried by the user. The portable terminal is operated by the user. And a portable terminal communication unit for performing communication with the outside, the portable terminal communication unit transmits a trigger signal generated based on a user operation, and the vehicle-mounted device is stopped by the vehicle. A stop state determination unit that determines whether or not the vehicle is in a state, an in-vehicle device communication unit for communicating with the mobile terminal and the key, and a trigger when the vehicle is in a stopped state and the in-vehicle device communication unit receives a trigger signal. An authentication unit that authenticates the mobile terminal based on the signal, and the vehicle-mounted device communication unit transmits a search signal for searching for a key to the vehicle interior when the vehicle receives a trigger signal when the vehicle is stopped, Your mobile device is properly authenticated, And an output unit that outputs an unlocking instruction for unlocking the door of the vehicle when a search response signal is received from the key in the vehicle interior in response to the search signal. A key communication unit for communicating with the in-vehicle device is provided, and the key communication unit transmits a search response signal when receiving the search signal.

  The present invention realizes an emergency response function that allows a vehicle to determine the presence or absence of a key in a passenger compartment and unlock it based on a trigger signal from a smartphone. Here, the smartphone only transmits a trigger signal to the vehicle. Thereby, the fall of the security property by using a general purpose portable terminal like a smart phone can be suppressed. Moreover, it is not necessary to wake up the operation procedure for unlocking, and it becomes difficult for a third party to peep. Further, the user can unlock the door without having to remember the operation procedure.

The figure which shows the structure of a key confinement prevention apparatus. The figure which shows the structure of a portable terminal. The figure which shows the structure of a vehicle equipment and a key. The flowchart which shows the trigger signal transmission process of a portable terminal. The flowchart which shows the key lock-in prevention process of vehicle equipment. The flowchart which shows the response process of a key.

  As shown in FIG. 1, the key lock-in prevention device 1 includes an in-vehicle device 100 mounted on a vehicle 10, a key 200 possessed by a user U <b> 1, and a mobile terminal 300. FIG. 1 shows the following situation. The user U1 who should originally have the key goes out of the vehicle with the key 200 placed inside the vehicle 10 (for example, on the driver's seat). In this situation, the user U2 remaining in the room of the vehicle 10 operates the door lock switch 20 in the room to lock the door. Therefore, the user U1 cannot unlock the door.

  As shown in FIG. 2, the portable terminal 300 is a control unit 301 including a known CPU and peripheral circuits, a memory 302, a reception unit 303, a transmission unit 304, an operation unit 305, for example, an LCD connected to the control unit 301. A display unit 306 and a position detection unit 307 are provided. The receiving unit 303 and the transmitting unit 304 correspond to a mobile terminal communication unit. The operation unit 305 may use either a touch panel or a mechanical switch formed on the screen of the display unit 306.

  The portable terminal 300 uses, for example, a tablet-type terminal represented by a well-known smartphone (a general term for a portable information terminal that is equipped with a touch panel on a display screen such as a liquid crystal display and is operated with a finger).

  The memory 302 uses a nonvolatile storage medium such as a flash memory, and stores data necessary for the operation of the mobile terminal 300 (for example, authentication data used for authentication described later) in addition to the OS and application programs. Various functions of the mobile terminal 300 are realized by the control unit 301 executing the application program.

  The receiving unit 303 is configured to receive at least a radio signal from the in-vehicle device 100, and uses, for example, an LF (long wave) radio wave. The transmission unit 304 is configured to transmit a radio signal to at least the in-vehicle device 100 and the key 200, and uses, for example, a radio wave in an RF (high frequency) band or an LF (long wave) band. If the configuration of the in-vehicle device 100 and the key 200 is as shown in FIG. 3, the RF band is used for the in-vehicle device 100, and the LF band is used for the key 200.

  For example, the position detection unit 307 receives a GPS signal from a well-known GPS satellite, and identifies the current position of the mobile terminal 300 on the map data based on the GPS signal. A configuration without the position detection unit 307 may be used.

  As shown in FIG. 3, the in-vehicle device 100 includes an ECU 101 and a memory 102, a transmission unit 103, and a reception unit 106 connected to the ECU 101.

  The ECU 101 corresponds to a stop state determination unit, an authentication unit, a verification unit, a determination unit, an output unit, a position information acquisition unit, and a vehicle position acquisition unit. The transmission unit 103 and the reception unit 106 correspond to the in-vehicle device communication unit (including each antenna). The receiving unit 106 also corresponds to a position information acquisition unit.

  ECU 101 includes a well-known CPU and peripheral circuits. Various functions of the in-vehicle device 100 are realized by the ECU 101 executing the in-vehicle device control program stored in the memory 102.

  The memory 102 uses a nonvolatile storage medium such as a flash memory, and stores data necessary for the operation of the in-vehicle device 100 such as a master code for collating the key 200 in addition to the in-vehicle device control program.

  The transmission unit 103 transmits a radio signal to the key 200 using, for example, LF (long wave) radio waves. A radio signal transmitted from the transmission unit 103 is transmitted in a limited communication area (for example, about 1 to 1.5 m from each antenna) via the vehicle interior transmission antenna 104 and the vehicle exterior transmission antenna 105 connected to the transmission unit 103. ) Only reached. The vehicle interior transmission antenna 104 is provided in the vehicle interior and transmits a radio signal into the vehicle interior. The vehicle interior transmission antenna 105 is provided in each door panel, door handle, or trunk, for example, and transmits a radio signal outside the vehicle interior.

  The receiving unit 106 is a radio that is transmitted from the key 200 and the portable terminal 300 using, for example, radio waves in the RF (high frequency) band via the vehicle interior reception antenna 107 and the vehicle exterior reception antenna 108 connected to the reception unit 106. Receive a signal. Thereby, even if the output level of a radio wave is relatively weak, for example, a communication distance of about 100 m in radius from the vehicle can be secured.

  The ECU 101 is communicably connected to the door ECU 121 and the navigation device 130 via the in-vehicle LAN 140. The navigation device 130 displays the current position of the vehicle 10 on the map and also shows the recommended route to the set destination on the map to guide the vehicle 10 to the destination.

  The door ECU 121 detects the state of the door switch 122 operated by the user, and controls the operation of the door lock mechanism 123 that unlocks / locks the door of the vehicle. The door switch 122 is attached to the door handle included in the door panel 120 or the vicinity thereof. Although only one door panel is illustrated, the number of panels varies depending on the configuration of the vehicle.

  The key 200 includes a control unit 201 including a known CPU and peripheral circuits, a memory 202 connected to the control unit 201, a transmission unit 203, a reception unit 205, and an operation unit 207. Various functions of the key 200 are realized by the controller 201 executing the key control program stored in the memory 202.

  The memory 202 uses a non-volatile storage medium such as a flash memory, and stores data necessary for the operation of the key 200 such as an ID code used for collation of the key 200 in addition to the key control program.

  The transmission unit 203 transmits a radio signal using radio waves in the RF band to the in-vehicle device 100 via the transmission antenna 204 connected to the transmission unit 203. The receiving unit 205 receives a radio signal transmitted by radio waves in the LF band from the in-vehicle device 100 and the portable terminal 300 via the receiving antenna 206 connected to the receiving unit 205. The transmission unit 203 and the reception unit 205 correspond to a key communication unit (including each antenna).

  The operation unit 207 mainly uses a remote keyless entry (hereinafter abbreviated as “RKE”) function, and uses, for example, a known mechanical switch. In accordance with the operation content of the operation unit 207, for example, an RKE command for locking / unlocking the door and unlocking the trunk is transmitted from the transmission unit 203.

  In the configuration of FIG. 3, a verification request signal is transmitted from the in-vehicle device 100 to the key 200 via the transmission unit 103. The key 200 that has received the verification request signal via the reception unit 205 transmits a verification response signal including an ID code for identifying itself to the in-vehicle device 100 via the transmission unit 203. The ECU 101 collates the received ID code with the master code stored in advance in the memory 102, and when the two match and the collation is normally performed, based on the state of the door switch 122, for example, the door A control signal including permission for locking or unlocking and permission for starting the engine is output to a corresponding device (not shown). That is, the vehicle-mounted device 100 and the key 200 constitute a known smart entry system.

  In other words, “two-way communication is performed between the key possessed by the user and the in-vehicle device mounted on the vehicle, the in-vehicle device collates the key, and based on the result, the operation control of a predetermined function of the vehicle is performed. By combining the “smart entry system to be performed” and the mobile terminal 300, the key lock-in prevention device 1 can be configured at a relatively low cost. Also, the existing smart entry system does not require the hardware change of the key and the vehicle-mounted device, and can be modified to the key lock-in prevention device 1 by changing the program.

  A trigger signal transmission process included in the application program and executed by the control unit 301 at a predetermined timing in the mobile terminal 300 in FIG. 4 will be described. First, it is determined whether or not the operation unit 305 detects an operation for transmitting a trigger signal by the user.

  When a user operation is detected (S11: Yes), when the configuration includes the position detection unit 307, the current position of the mobile terminal 300 is acquired from the position detection unit 307 (S12). Next, position information including the current position is created (S13). When the configuration does not include the position detection unit 307, S12 and S13 are not executed.

Next, a trigger signal is transmitted to the vehicle equipment 100 via the transmission part 304 (S14). The contents of the trigger signal are as follows.
An identification code indicating the trigger signal.
Authentication data stored in the memory 302 The authentication data can uniquely identify the mobile terminal 300, for example.
In the case of a configuration including the position detection unit 307, position information.

  The trigger signal is preferably transmitted after being encrypted. As a result, even if the trigger signal is intercepted by a portable terminal owned by a third party, it becomes difficult to decode the contents. As the encryption algorithm, any known algorithm such as character string conversion, data bit inversion, and AES may be used.

  Next, when data (see FIG. 5) is received from the in-vehicle device 100 (S15: Yes), a message corresponding to the received content is displayed on the display unit 306 (S16). Then, this process is complete | finished. Note that S15 and S16 are executed only when the configuration is such that data is received from the in-vehicle device 100 after the trigger signal is transmitted.

In the in-vehicle device 100 in FIG. 5, a key closing prevention process included in the in-vehicle device control program and executed by the ECU 101 at a predetermined timing will be described. First, it is determined whether or not the vehicle 10 is stopped. When at least one of the following holds, it is determined that the vehicle is stopped. Information used for the determination is acquired from another vehicle device via the in-vehicle LAN 140.
The shift position of the vehicle 10 is “P (parking)”.
-The speed of the vehicle 10 is 0 km / h.
-The parking brake of the vehicle 10 is in an operating state.
In addition, about the motor | power_engine (engine or motor) of the vehicle 10, a rotation state or a stop state may be sufficient. That is, the stop state is a state in which the vehicle stops and the user U1 who is the original owner of the key 200 is in the vicinity of the vehicle 10 and does not leave.

  When the vehicle 10 is not in a stopped state (S31: No), this process is terminated. On the other hand, when the vehicle 10 is in a stopped state (S31: Yes), a trigger signal reception waiting state from the mobile terminal 300 is entered. The trigger signal reception waiting state ends when the vehicle 10 is no longer stopped.

  When the trigger signal is received (S32: Yes), a search signal for searching whether or not the key 200 is in the room of the vehicle 10 is transmitted from the transmission unit 103 via the vehicle interior transmission antenna 104 (S33). .

  The above-described configuration is “the in-vehicle device communication unit transmits a search signal before the authentication unit authenticates the mobile terminal”. With this configuration, by transmitting the search signal before authentication of the mobile terminal, it is possible to shorten the time from receiving the trigger signal to receiving the search response signal.

  Next, the mobile terminal 300 is authenticated by comparing the authentication data included in the trigger signal with the authentication data stored in advance in the memory 102 (S34). When the two authentication data do not match and authentication is not normally performed (S35: No), this process is terminated. On the other hand, when the two authentication data match and the authentication is normally performed (S35: Yes), after that, a search response signal from the key 200 is waited to be received.

  The authentication data is written in the memory (102 or 302) when the mobile terminal 300 is registered in the in-vehicle device 100. Registration is preferably performed by an operator with specialized knowledge in a facility such as a dealer that is considered to have a relatively high security.

  When the search response signal is not received within the predetermined time (S36: No → S42: Yes), “keyless information” including that the key 200 has not been detected in the room of the vehicle 10 is transmitted (S43). The mobile terminal 300 receives the information in S15 of FIG. The configuration may be such that “no-key information” is not transmitted.

On the other hand, when the search response signal is received within the predetermined time (S36: Yes), the position information of the mobile terminal 300 is acquired using at least one of the following (S37).
When the key 200 is configured to receive a trigger signal from the portable terminal 300, the position information is acquired because the position information is included in the search response signal. The position information includes either the content indicating whether or not the trigger signal is received or the received electric field strength (RSSI) of the trigger signal.
• If position information is included in the trigger signal, this position information is acquired.

Next, based on the position information, it is determined whether the mobile terminal 300 is within a predetermined range from the vehicle 10 using at least one of the following.
When the key 200 is configured to receive a trigger signal from the portable terminal 300 and the position information includes the content indicating that the trigger signal has been received, it is determined that the key 200 is within a predetermined range. When the trigger signal is transmitted by radio waves in the LF band, since the effective reach distance of the signal is about 1 to 1.5 m as described above, it can be determined that the trigger signal is within a predetermined range by receiving the trigger signal. .
When the key 200 is configured to receive a trigger signal from the mobile terminal 300 and the position information includes the RSSI of the trigger signal, the RSSI is within a predetermined range when the RSSI exceeds a predetermined RSSI threshold. judge. When the position information includes a comparison result with the RSSI threshold, it is determined whether or not the position information is within a predetermined range based on the comparison result.

When the position information is included in the trigger signal, the current position of the vehicle 10 is acquired from the navigation device 130, the distance between the vehicle 10 and the mobile terminal 300 is calculated from the position information and the current position, When the distance is within the predetermined range, it is determined that the distance is within the predetermined range.

  The above-described configuration is “the in-vehicle device is a position information acquisition unit that acquires position information including the position of the mobile terminal, and a determination unit that determines whether the mobile terminal is within a predetermined range from the vehicle based on the position information. And when the mobile terminal is within a predetermined range from the vehicle, the output unit outputs an unlocking instruction. " According to this configuration, since the door is not unlocked unless the user holding the portable terminal is in the vicinity of the vehicle, a third party can be prevented from entering the vehicle before the user gets into the vehicle.

  The above-described configuration in which the key 200 receives the trigger signal from the mobile terminal 300 is “the key communication unit receives the trigger signal and obtains the position information based on the reception state of the trigger signal when the trigger signal is received. And the key communication unit transmits the search response signal including the position information ”. With this configuration, it is possible to start a process as to whether or not the vehicle-mounted device and the key unlock the door almost simultaneously with a single trigger signal. Compared to a configuration in which an instruction is sent from the in-vehicle device that has received the trigger signal from the mobile terminal to the key, the timing for creating the position information can be made earlier. When the search signal is received from the in-vehicle device, the creation of the position information may be completed with the key, so the time from the user operation to the door unlocking can be shortened, and the convenience for the user can be improved. In addition, there is an advantage that communication safety is higher between the key and the in-vehicle device than between the portable terminal and the in-vehicle device.

  The configuration in which the position information is included in the trigger signal described above is “the mobile terminal includes a position detection unit that detects the position of the mobile terminal, and the mobile terminal communication unit includes the position of the mobile terminal and transmits the position information. The in-vehicle device includes a vehicle position acquisition unit that acquires the position of the vehicle, the in-vehicle device communication unit receives and acquires the position information, and the determination unit includes the position of the mobile terminal included in the received position information, the vehicle It is determined whether or not the mobile terminal is within a predetermined range from the vehicle on the basis of the position. With this configuration, the position of the mobile terminal can be determined between the mobile terminal and the in-vehicle device without using a key.

  When the portable terminal 300 is not within the predetermined range from the vehicle 10 (S38: No), this process is terminated. On the other hand, when the mobile terminal 300 is within the predetermined range from the vehicle 10 (S38: Yes), the key 200 is collated as described above (S39). The verification request signal is transmitted from the transmission unit 103 via the vehicle interior transmission antenna 104. Does not transmit from other transmit antennas.

  When collation is not performed normally (S40: No), this process is complete | finished. On the other hand, when the collation is normally performed (S40: Yes), an instruction to unlock at least the door lock device of the driver's seat is output to the door ECU 121 (S41). Then, this process is complete | finished.

  When the above-mentioned configuration is “the in-vehicle device communication unit receives a search response signal, it transmits a verification request signal for verifying the key, receives a verification response signal from the key in response to the verification request signal, A collation unit that collates the key based on the signal; when the key collation is correctly performed, the output unit outputs an unlocking instruction; and when the key communication unit receives the collation request signal, the collation response signal Send ". In the known smart entry system, the vehicle-mounted device performs operation control of various functions of the vehicle by collating keys. With this configuration, the conditions for unlocking the door are increased, and the possibility that the door lock is unlocked is reduced, and the security is improved. In addition, an increase in cost can be suppressed by using the configuration of an existing system.

  A response process included in the key control program for the key 200 in FIG. 6 and executed by the control unit 201 at a predetermined timing will be described. When no user operation is performed, the key 200 is in a waiting state for receiving a response request signal from the in-vehicle device 100 or a trigger signal from the mobile terminal 300.

When the trigger signal is received (S51: Yes), position information reflecting the position of the mobile terminal 300 is created using at least one of the following (S52).
-Include "Trigger signal received" in the location information.
The reception unit 205 measures the RSSI of the trigger signal and includes the measurement result in the position information. The above-mentioned RSSI threshold value may be stored in the memory 202, and the comparison result between the measurement result and the RSSI threshold value may be included in the position information.

  After this, a search signal reception waiting state from the in-vehicle device 100 is entered. When the search signal is not received within the predetermined time (S53: No → S57: Yes), this process is terminated. On the other hand, when a search signal is received within a predetermined time (S53: Yes), a search response signal is transmitted (S54). The search response signal includes at least position information. A key ID may be included. After that, it enters a waiting state for receiving a verification request signal from the in-vehicle device 100.

  When the verification request signal is not received within the predetermined time (S55: No → S58: Yes), this process is terminated. On the other hand, when a collation request signal is received within a predetermined time (S55: Yes), a collation response signal including a key ID is transmitted (S56). Then, this process is complete | finished.

  Although the embodiments have been described above, these are merely examples, and are not limited to the above-described embodiments, and various modifications based on the knowledge of those skilled in the art are possible without departing from the scope of the claims. .

DESCRIPTION OF SYMBOLS 1 Key confinement prevention apparatus 10 Vehicle 100 Vehicle equipment 101 ECU (stop state determination part, authentication part, collation part, determination part, output part, position information acquisition part, vehicle position acquisition part)
103 Transmitter (in-vehicle device communication unit)
106 Receiving part (vehicle equipment communication part, position information acquisition part)
200 key 203 transmission unit (key communication unit)
205 Receiving part (key communication part)
300 mobile terminal 303 receiving unit (mobile terminal communication unit)
304 Transmission unit (portable terminal communication unit)
305 Operation unit 307 Position detection unit

Claims (6)

An in-vehicle device mounted on a vehicle, a key of the vehicle possessed by a user, and a mobile terminal possessed by the user,
The portable terminal is
An operation unit operated by the user;
A mobile terminal communication unit for communicating with the outside;
With
The mobile terminal communication unit transmits a trigger signal generated based on the user's operation,
The in-vehicle device is
A stop state determination unit that determines whether or not the vehicle is in a stop state; and
An in-vehicle device communication unit for communicating with the portable terminal and the key;
An authentication unit that authenticates the portable terminal based on the trigger signal when the vehicle is stopped and the in-vehicle device communication unit receives the trigger signal;
With
When the vehicle receives the trigger signal when the vehicle is stopped, the vehicle-mounted device communication unit transmits a search signal for searching for the key to the interior of the vehicle,
When the mobile terminal is correctly authenticated and a search response signal from the key in the vehicle interior is received in response to the search signal, an unlocking instruction for unlocking the vehicle door is issued. An output unit for outputting is further provided,
The key is
A key communication unit for communicating with at least the in-vehicle device;
The key close-up prevention device that transmits the search response signal when the key communication unit receives the search signal.   2. The key lock-in prevention device according to claim 1, wherein the in-vehicle device communication unit transmits the search signal before the authentication unit authenticates the portable terminal. When the vehicle-mounted device communication unit receives the search response signal, it transmits a verification request signal for verifying the key, and receives a verification response signal in response to the verification request signal from the key,
A collation unit that collates the key based on the collation response signal;
When the verification of the key is correctly performed, the output unit outputs the unlock instruction,
3. The key lock-in prevention device according to claim 1, wherein the key communication unit transmits the verification response signal when receiving the verification request signal. 4. The in-vehicle device is
A position information acquisition unit for acquiring position information including the position of the mobile terminal;
A determination unit that determines whether the portable terminal is within a predetermined range from the vehicle based on the position information;
With
4. The key lock-in prevention device according to claim 1, wherein the output unit outputs the unlocking instruction when the portable terminal is within a predetermined range from the vehicle. 5. The key communication unit receives the trigger signal,
Create the position information based on the reception state of the trigger signal when the trigger signal is received,
The key lock prevention device according to claim 4, wherein the key communication unit transmits the search response signal including the position information. The portable terminal is
A position detector for detecting the position of the mobile terminal;
The mobile terminal communication unit transmits the position of the mobile terminal included in the position information,
The in-vehicle device is
A vehicle position acquisition unit for acquiring the position of the vehicle;
The in-vehicle device communication unit receives and acquires the position information,
The determination unit determines whether the mobile terminal is within a predetermined range from the vehicle based on the position of the mobile terminal included in the received position information and the position of the vehicle. The key lock-in prevention device according to claim 5.

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