JP7031208B2 - Vehicle collation system, vehicle electronic key system - Google Patents

Description

The present invention relates to a vehicle collation system for collating an electronic key, and a vehicle electronic key system including a vehicle collation system and an electronic key.

Even though the electronic key does not exist in the out-of-vehicle collation area set to a few meters near the vehicle door, the radio wave emitted by the electronic key and the collation system mounted on the vehicle is relayed, so that the collation system can be operated. It may be judged that the collation is established. If the collation system determines that the collation is successful based on the relayed radio waves, the vehicle door is unlocked and the vehicle is stolen even though the vehicle user is not near the vehicle.

A technique for estimating the position of an electronic key is known in order to prevent the vehicle from being stolen by this technique. In the technique disclosed in Patent Document 1, the electronic key receives the position of the vehicle from the on-board unit and transmits the received position to a terminal having a position detection function such as a smartphone carried by the user together with the electronic key. do.

The terminal equipped with the position detection function estimates the position of the own terminal as the position of the electronic key, and measures the distance between the vehicle and the own terminal from the position of the own terminal and the position of the vehicle. If this distance is greater than or equal to the threshold, the electronic key is not allowed to return the response signal to the on-board unit.

Japanese Unexamined Patent Publication No. 2016-155526

The technique disclosed in Patent Document 1 requires a terminal having a position detection function such as a smartphone. Therefore, what to do if you forget to own this terminal becomes a problem. Therefore, it is desired that the vehicle collation system identifies the position of the electronic key by using the radio wave emitted by the electronic key without the need for a terminal having a position detection function.

When the position of the electronic key is specified by using the radio wave emitted by the electronic key, there is a possibility that fraud is more likely to occur than the technique disclosed in Patent Document 1. For example, when radio field strength is used to estimate the position of an electronic key, the relay device adjusts the radio field strength so that it is at the same level as the radio field strength received by the in-vehicle collation system when the electronic key is located in the out-of-vehicle collation area. This can lead to fraud.

This disclosure is based on this circumstance, and its purpose is to illegally permit the unlocking of the vehicle door lock without the need for a terminal equipped with a position detection function. It is an object of the present invention to provide a vehicle collation system and a vehicle electronic key system that can prevent the storage.

The above object is achieved by a combination of the features described in the independent claims, and the sub-claims specify further advantageous specific examples. The reference numerals in parentheses described in the claims indicate, as one embodiment, the correspondence with the specific means described in the embodiments described later, and do not limit the disclosed technical scope.

One disclosure to achieve the above objectives is
A vehicle collation system that communicates with an electronic key (2) carried by a user of a vehicle (3) to determine whether or not the electronic key collation is established.
The communication unit (120, 140) that receives the position estimation signal transmitted by the electronic key in the RF band radio wave, and
A position estimation unit (151) that estimates the position of the electronic key based on the position estimation signal received by the communication unit, and a position estimation unit (151).
A locus determination unit (152) that determines the movement trajectory of the electronic key based on the position of the electronic key sequentially estimated by the position estimation unit, and
A determination unit (153) that determines whether or not the movement trajectory determined by the trajectory determination unit is a normal trajectory when a user carrying an electronic key walks and approaches a vehicle.
A permission unit (154) for permitting the unlocking operation of the door lock of the vehicle is provided based on the fact that the collation of the electronic key is established and the determination unit determines that the movement trajectory is a normal trajectory .
The normal locus includes a locus that approaches the vehicle sequentially from outside the out-of-vehicle collation area .

This vehicle collation system permits the unlocking operation of the door lock of the vehicle based on the determination that the movement locus is a normal locus in addition to the fact that the collation of the electronic key is established. For a person who tries to steal a vehicle, it is more difficult to reproduce a normal movement trajectory determined from a plurality of positions than a position. Therefore, by making it possible to determine that the movement locus is a normal locus as a condition for permitting the unlocking operation of the door lock of the vehicle, it is possible to prevent the unlocking operation of the door lock of the vehicle from being illegally permitted. can.

It is an overall block diagram of the electronic key system 1 for a vehicle of an embodiment. It is a block diagram which shows the structure of the electronic key 2 of FIG. It is a flowchart which shows the process which the collation ECU 150 of an in-vehicle collation system 100 executes. It is a figure explaining the method of the position estimation performed in S4 of FIG. It is a flowchart which shows the process which the key control unit 24 of the electronic key 2 executes. It is a flowchart which shows the process which the collation ECU 150 of an in-vehicle collation system 100 executes.

<Embodiment>
Hereinafter, embodiments will be described with reference to the drawings.

[overall structure]
FIG. 1 is an overall configuration diagram of a vehicle electronic key system 1. The vehicle electronic key system 1 includes an electronic key 2 carried by a user and an in-vehicle collation system 100 mounted on the vehicle 3. The in-vehicle collation system 100 corresponds to the vehicle collation system according to the claim.

The vehicle electronic key system 1 communicates between the electronic key 2 and the vehicle-mounted collation system 100 to collate the code without the user operating the electronic key 2, and the collation is established. , A system that permits the operation of predetermined in-vehicle devices. The predetermined in-vehicle device is, for example, a driving force source such as a door lock mechanism provided on the door of the vehicle 3 and an engine.

[Configuration of in-vehicle collation system 100]
The in-vehicle collation system 100 includes a first array antenna 110, a first communication unit 120, a second array antenna 130, a second communication unit 140, a collation ECU 150, an unlock sensor 160, a lock sensor 170, and a push start button 180.

The first array antenna 110 is an array antenna including three antenna elements 111a, 111b, 111c. Hereinafter, when the three antenna elements 111a, 111b, and 111c are not distinguished, they are referred to as antenna elements 111. The antenna element 111 is adjusted to have an electrical length for transmitting and receiving radio waves in the RF band. Specifically, the RF band is, for example, 315 MHz or 920 MHz. A dielectric may be arranged at the end of the antenna element 111 for low profile.

The three antenna elements 111a, 111b, and 111c included in the first array antenna 110 are arranged at intervals determined based on the wavelengths of the radio waves transmitted and received. Specifically, the three antenna elements 111a, 111b, and 111c are arranged at equal angular intervals in a circle having a radius determined based on the wavelength of the radio wave to be transmitted and received.

The first communication unit 120 is a transmission / reception circuit that transmits / receives radio waves using the first array antenna 110. The first communication unit 120 includes a modulation unit, a demodulation unit, an amplification unit, an AD conversion unit, and the like.

The second array antenna 130 has the same configuration as the first array antenna 110, and includes three antenna elements 131a, 131b, and 131c. Hereinafter, when the three antenna elements 131a, 131b, and 131c are not distinguished, they are referred to as antenna element 131. The electrical length and the arrangement of the three antenna elements 131a, 131b, and 131c are the same as those of the antenna element 111 included in the first array antenna 110.

The second communication unit 140 is a transmission / reception circuit that transmits / receives radio waves using the second array antenna 130, and has the same configuration as the first communication unit 120.

The first array antenna 110 and the second array antenna 130 can be installed in various positions. It is preferable that the first array antenna 110 and the second array antenna 130 are arranged at positions different from each other in the front-rear direction of the vehicle 3. The reason for this is as follows.

When the user carrying the electronic key 2 approaches the vehicle 3, the user approaches the vehicle 3 from the side of the vehicle 3. If the positions of the first array antenna 110 and the second array antenna 130 in the front-rear direction of the vehicle 3 are different, the two array antennas 110 and 130 are used when the electronic key 2 is located on the side of the vehicle 3. The difference in the direction of the electronic key 2 estimated by the above can be increased. As a result, the position accuracy of the electronic key 2 estimated from the two directions can be improved. Therefore, it is preferable to arrange the first array antenna 110 and the second array antenna 130 at positions where the positions of the vehicle 3 in the front-rear direction are different from each other.

For example, the first array antenna 110 is arranged on the front side of the vehicle 3 with respect to the center of the vehicle 3 in the front-rear direction, and the second array antenna 130 is arranged on the rear side of the vehicle 3 with respect to the center in the front-rear direction of the vehicle 3. .. The first array antenna 110 is arranged on the front side of the vehicle 3 as much as possible. For example, it is arranged on the upper surface of the bonnet of the vehicle 3. When it is difficult to arrange the antenna on the bonnet, the front end of the outer surface of the roof, the front end of the back side of the roof in the vehicle interior, or the like is an example of arrangement of the first array antenna 110.

On the other hand, the second array antenna 130 is arranged on the rear side of the vehicle 3 as much as possible. For example, it is arranged on the upper surface of the trunk of the vehicle 3. Alternatively, the rear end of the outer surface of the roof, the rear end of the back side of the roof in the vehicle interior, and the like are examples of arrangement of the second array antenna 130.

The unlock sensor 160 is a sensor that is installed at or near the door handle of the vehicle 3 and is touched by the user when unlocking the door of the vehicle 3. The lock sensor 170 is a sensor that is installed at or near the door handle of the vehicle 3 and is touched by the user when locking the door of the vehicle 3. The push start button 180 is a button operated by the user when the drive source of the vehicle 3 is turned on, and is arranged in the passenger compartment of the vehicle 3. The drive source of the vehicle 3 is, for example, one or both of an engine and a motor. The on state of the engine is the state in which the engine is being driven, and the on state of the motor is the state in which the rotation of the motor is permitted.

The collation ECU 150 is a computer equipped with a CPU, ROM, RAM, etc., and the CPU executes a program stored in a non-transitional substantive recording medium such as a ROM while using the temporary storage function of the RAM. .. As a result, the collation ECU 150 executes various controls.

Functions executed by the collation ECU 150 include a position estimation unit 151, a locus determination unit 152, a determination unit 153, and a permission unit 154 shown in FIG. The functions executed by the collation ECU 150 will be described later with reference to FIGS. 3, 5, and 6. Note that the CPU executing the above program means that the method corresponding to the program is executed. Further, a part or all of the functions executed by the collation ECU 150 may be configured in terms of hardware by one or a plurality of ICs or the like.

[Configuration of electronic key 2]
As shown in FIG. 2, the electronic key 2 includes a communication unit 21, a lock switch 22, an unlock switch 23, and a key control unit 24. In addition to this, a door open / close switch, a mechanical key, or the like may be provided.

The communication unit 21 has a configuration capable of communicating with the first communication unit 120 and the second communication unit 140 included in the vehicle-mounted collation system 100. Specifically, the communication unit 21 includes an antenna for transmitting and receiving the same frequency as the first array antenna 110 and the second array antenna 130, a modulation unit, a demodulation unit, an amplification unit, an AD conversion unit, and the like.

The lock switch 22 and the unlock switch 23 are arranged on the surface of the electronic key 2 and can be pressed by the user. The lock switch 22 is a switch pressed by the user when instructing to unlock the door lock of the vehicle 3. The unlock switch 23 is a switch pressed by the user when instructing to lock the door lock of the vehicle 3.

The key control unit 24 is a computer equipped with a CPU, ROM, RAM, etc., and the CPU uses the temporary storage function of the RAM to store a program stored in a non-transitional substantive recording medium such as a ROM. Execute. As a result, the key control unit 24 performs various controls. When the CPU executes the above program, it means that the method corresponding to the program is executed. Further, a part or all of the functions executed by the key control unit 24 may be configured in terms of hardware by one or a plurality of ICs or the like.

The key control unit 24 analyzes received data, for example. Specifically, the signal demodulated by the communication unit 21 is analyzed, and it is determined whether or not the signal is a signal transmitted by the vehicle-mounted collation system 100.

Further, the key control unit 24 generates a signal to be transmitted, and outputs the generated signal to the communication unit 21. The generated signal is, for example, a matching signal or a position estimation signal. Further, when the lock switch 22 is pressed, a signal instructing to lock the door lock of the vehicle 3 is generated, and when the unlock switch 23 is pressed, the door lock of the vehicle 3 is unlocked. A signal is generated that tells you to do so. A more detailed description of the process executed by the key control unit 24 will be described later.

[Fraud prevention processing]
The vehicle electronic key system 1 executes fraud prevention processing for preventing fraudulent collation from being established even though the person who possesses the electronic key 2 does not exist near the vehicle 3. Next, this fraud prevention process will be described.

FIG. 3 shows a process executed by the collation ECU 150 when the electronic key 2 exists outside the vehicle 3. The collation ECU 150 repeatedly executes the process shown in FIG. 3 at regular intervals when the electronic key 2 is outside the vehicle 3. The collation ECU 150 determines that the electronic key 2 exists outside the vehicle 3 when the electronic key 2 cannot be detected inside the vehicle 3.

In FIG. 3, in step (hereinafter, step is omitted) S1, it is determined whether or not the preset polling cycle has elapsed since the previous execution of FIG. The polling cycle can be a cycle in which the electronic key 2 should be detected, and can be set arbitrarily.

If the judgment of S1 is YES, the process proceeds to S2, and if NO, the process proceeds to S3. In S2, polling is performed. Specifically, a polling signal is transmitted from one of the first communication unit 120 and the second communication unit 140. The polling signals may be alternately transmitted from the first communication unit 120 and the second communication unit 140.

Although it depends on the reception sensitivity of the electronic key 2, the electronic key 2 can receive the polling signal even if the distance from the vehicle 3 is several tens of meters or more. This is because the polling signal is transmitted by radio waves in the RF band. The range in which the electronic key 2 can receive the polling signal is, for example, about 50 m to 100 m from the vehicle 3.

When the electronic key 2 receives the polling signal, the electronic key 2 returns a position estimation signal. The position estimation signal includes the ID of the electronic key 2. In S3, it is determined whether or not the position estimation signal has been received. If this judgment is YES, the process proceeds to S4, and if NO, the process proceeds to S6.

In S4, the position of the electronic key 2 is estimated based on the position estimation signal. In this S4, first, the arrival direction of the position estimation signal is estimated for each of the array antennas 110 and 130. Various methods can be used for estimating the arrival direction by the array antennas 110 and 130. For example, a method of estimating the arrival direction from the distance between the antenna elements 111 and 131 and the phase difference or arrival time difference of the radio waves received by the antenna elements 111 and 131, the MUSIC method, the ESPRIT method and the like can be used. Further, when the array antennas 110 and 130 are used as adaptive array antennas, a beam former or the like can also be used.

Subsequently, the arrival direction line L is determined. The arrival direction line L is a straight line extending from the array antennas 110 and 130 in the arrival direction of the position estimation signal estimated based on the radio waves received by the array antennas 110 and 130.

FIG. 4 shows the arrival direction line L1 corresponding to the first array antenna 110 and the arrival direction line L2 corresponding to the second array antenna 130. The base point of the arrival direction line L1 is the center of gravity of the first array antenna 110, and the base point of the arrival direction line L2 is the center of gravity of the second array antenna 130. Then, it is estimated that the intersection of the arrival direction lines L1 and L2 is the position where the electronic key 2 exists.

In the following S5, the movement locus is updated. The movement locus is a concatenation of the positions estimated in S4 for the same electronic key 2.

In S6, it is determined whether or not there is an unlock operation. That is, it is determined whether or not the unlock sensor 160 has detected the user's operation. If this judgment is YES, the process proceeds to S7, and if NO, the process proceeds to S11.

In S7, collation processing is performed. Specifically, a signal requesting a code is transmitted from the communication units 120 and 140 to the electronic key 2, and the code transmitted from the electronic key 2 is collated in response to the signal. It should be noted that this collation process may be performed when it is determined that the electronic key 2 has entered the out-of-vehicle collation area Ao shown in FIG. The vehicle exterior collation area Ao shown in FIG. 4 is an area set on the side of the vehicle 3, and the horizontal plane shape of the vehicle exterior collation area Ao is a semicircle having a radius of about 1 to several meters in contact with the side surface of the vehicle 3. Note that this shape is an example, and the shape of the out-of-vehicle collation area Ao can be arbitrarily set such as a rectangular shape.

In S8, it is determined whether or not the collation is OK as a result of the collation process of S7. If the collation is not established, the process proceeds to S11, and if the collation is OK, the process proceeds to S9.

In S9, it is determined whether or not the movement locus is normal. If the movement locus is a locus that sequentially approaches the vehicle 3 and reaches the door of the vehicle 3 from outside the vehicle exterior collation area Ao or after entering the vehicle exterior collation area Ao, the movement locus is considered to be normal. to decide. Of course, consider that the latest position of the electronic key 2 is within reach of the unlock sensor 160.

Further, whether or not the movement locus is normal also considers the movement speed and the amount of change in direction of the electronic key 2 for one time that can be estimated from the movement locus. When the moving speed exceeds the speed possible for the walking user, it is determined that the moving locus is not normal even if the shape of the moving locus is normal. It is also determined that the movement locus is not normal even when the update length of the movement locus each time is discontinuous.

The judgment of discontinuity can be set as appropriate. For example, when the amount of movement of the electronic key 2 each time is d (n) and the amount of movement of the previous and next times is d (n-1) and d (n + 1), either Equation 1 or Equation 2 or When both are not satisfied, it is judged to be discontinuous. In addition, α is 2, for example.
(Equation 1) (1 / α) <d (n + 1) / d (n) <α
(Equation 2) (1 / α) <d (n) / d (n-1) <α
If the judgment of S9 is NO, the process proceeds to S11, and if YES, the process proceeds to S10. In S10, a signal instructing the door lock ECU 5 to operate the door lock mechanism to unlock the door lock is transmitted.

In S11, it is determined whether or not the position estimation signal is being received periodically. If the determination in S11 is YES, that is, if the position estimation signal is being received periodically, polling is not necessary, and the process returns to S3. On the other hand, if the determination in S11 is NO, the process of FIG. 3 is terminated, and when the execution timing of FIG. 3 is reached, S1 is executed again.

FIG. 5 is a process executed by the key control unit 24 of the electronic key 2. The key control unit 24 periodically executes the process shown in FIG. 5 at a preset cycle. In S21, it is determined whether or not the polling signal has been received. If this judgment is YES, the process proceeds to S22, and if NO, the process proceeds to S28.

In S22, a position estimation signal is transmitted. In the following S23, it is determined whether or not the transmission cycle has elapsed since the position estimation signal was transmitted last time. The transmission cycle is set to such a cycle that it can be determined whether the movement locus of the user carrying the electronic key 2 is normal. When the door of the vehicle 3 is illegally unlocked by using the relay device, the movement locus suddenly moves to the vicinity of the vehicle 3 from a distance of several tens of meters or more from the vehicle 3, or the movement locus in the distance is changed. In the absence of the vehicle 3, a locus may suddenly occur in the vicinity of the vehicle 3. The transmission cycle may be set so that such a locus can be distinguished from a movement locus when a legitimate user carrying the electronic key 2 approaches the vehicle 3. The transmission cycle is, for example, about several seconds, but may be about 0.3 seconds in accordance with the conventional polling cycle.

If the judgment of S23 is YES, the process proceeds to S24, and if NO, the process proceeds to S25. In S24, the position estimation signal is transmitted again. In S25, it is determined whether or not the transmission period has expired. If this judgment is NO, the process proceeds to S26, and if YES, the process proceeds to S28. The transmission period is a period required to generate a movement locus, for example, 5 to 10 seconds.

In S26, it is determined whether or not collation is requested. Specifically, this determination is to determine whether or not the collation process is executed in FIG. 3 and a signal requesting the code transmitted from the vehicle 3 is received.

If the determination in S26 is YES, the process proceeds to S27, a verification signal including a verification code is transmitted, and then the process returns to S23. If the judgment of S26 is NO, the process returns to S23 without executing S27. By executing S23 to S25 again, the position estimation signal is transmitted at each transmission cycle during the transmission period.

If the judgment of S25 is YES, the process proceeds to S28. The determination of S28 is the same as that of S26, and it is determined whether or not collation is requested. If this determination is YES, a collation signal is transmitted in S29 to end the process of FIG. On the other hand, if the determination in S28 is NO, the process of FIG. 5 is terminated without executing S29.

Once the process of FIG. 5 is completed, S21 is executed again after the execution cycle of FIG. 5 has elapsed. Therefore, if the electronic key 2 is present in the range where the polling signal can be received, the position estimation signal is continuously transmitted to the vehicle 3.

Even if a person who illegally unlocks the door of the vehicle 3 by using the relay device (hereinafter referred to as an illegal person) operates the unlock sensor 160 by the process shown in FIGS. 3 and 5, the unlock sensor 160 is operated by the same. It is possible to prevent the door of the vehicle 3 from being unlocked. The reason will be explained concretely.

There are usually two fraudsters, one located near the vehicle 3 and the other near the user possessing the electronic key 2. The signal transmitted by the vehicle 3 is relayed by the first relay device possessed by the first fraudster located near the vehicle 3 and the second relay device possessed by the second fraudster located near the user. Then, it is received by the electronic key 2 possessed by the user. Since the electronic key 2 receives the signal from the vehicle 3, it returns the signal.

When the reply signal reaches the vehicle 3 directly without being relayed, it is not determined that the movement locus is normal because the position of the electronic key 2 is far away.

Further, when the reply signal is relayed by the second relay device and the first relay device and received by the vehicle 3, a movement locus is suddenly generated in the vicinity of the vehicle 3, so that the movement locus is normal. Will not be judged.

Further, even if an unauthorized person possessing the first relay device behaves as if he / she approaches the vehicle 3 from a relatively long distance of the vehicle 3, the movement trajectory is normal for the following reason. In many cases, it is not determined to be.

That is, in a state where the first relay device is located near the vehicle 3, the signal transmitted by the electronic key 2 relayed by the second relay device to the first relay device is received by the first relay device, but the vehicle. It is rare that it is not received by 3. That is, the signal transmitted by the second relay device to the first relay device is likely to be received by the vehicle 3. In addition, due to changes in the radio wave environment depending on the position and time, there is a high possibility that the position included in the movement locus is the position of the first relay device and the case where the position is the second relay device. .. In this case as well, it will not be determined that the movement locus is normal.

From these facts, even if an unauthorized person operates the unlock sensor 160, it is possible to prevent the door of the vehicle 3 from being unlocked.

Further, in the present embodiment, when the collation ECU 150 determines that the electronic key 2 is present in the vehicle interior, the collation ECU 150 executes the process shown in FIG. By the process shown in FIG. 6, it is possible to prevent an unauthorized person from driving the vehicle 3.

The collation ECU 150 periodically performs the process shown in FIG. 6 when the door of the vehicle 3 is opened and then the door is closed after the collation is established outside the vehicle 3, but the drive source is not in the ON state. To execute.

S31 to S35 are the same as S1 to S5 in FIG. Therefore, polling is performed in each polling cycle, and the position estimation signal is received and the movement locus is updated in each transmission cycle of the position estimation signal.

If S35 is executed, or if the determination of S33 is NO, the process proceeds to S36. In S36, it is determined whether or not the push start button 180 has been pressed. If this judgment is NO, the process proceeds to S41, and if YES, the process proceeds to S37.

In S37, the same collation process as in S7 of FIG. 3 is executed. In the following S38, it is determined whether or not the collation is established. The processing of S38 is the same as that of S8. If the judgment of S38 is NO, the process proceeds to S41, and if YES, the process proceeds to S39.

In S39, it is determined whether or not the movement locus is normal. In the state of making the judgment of S39, the electronic key 2 should be in the vehicle. Therefore, in the determination of S39, the movement locus indicating that the electronic key 2 is hardly moving is normal. In addition, the fact that the latest position of the electronic key 2 is in the in-vehicle collation area Ai is also one of the conditions for determining that the movement locus is normal.

FIG. 4 also shows the in-vehicle collation area Ai. The in-vehicle collation area Ai is set in the vehicle as an area that does not leave the vehicle 3. This in-vehicle collation area Ai corresponds to the conventional vehicle interior collation area, and may be set in the same range as the vehicle interior collation area conventionally formed by using the LF antenna installed in the vehicle interior. ..

If the judgment of S39 is NO, the process proceeds to S41, and if YES, the process proceeds to S40. In S40, a signal permitting the drive source to be turned on is transmitted to the power supply ECU 6.

In S41, it is determined whether or not the position estimation signal is being received periodically. If the determination in S41 is YES, there is no need to poll, so the process returns to S3. On the other hand, if the determination in S41 is NO, the process of FIG. 6 is terminated, and when the execution timing of FIG. 6 is reached, S31 is executed again.

In the flowcharts shown in FIGS. 3, 5, and 6, S4 and S34 correspond to the position estimation unit 151, S5 and S35 correspond to the locus determination unit 152, and S9 and S39 correspond to the determination unit 153. S10 and S40 correspond to the permission unit 154.

[Summary of embodiments]
In the vehicle-mounted collation system 100 of the above-described embodiment, in addition to the collation of the electronic key 2 being established, the fact that the movement locus is a normal locus is also a condition for permitting the unlocking of the door of the vehicle 3. ..

It is more difficult for a fraudster to reproduce a normal movement locus determined from multiple positions than a position. Therefore, the in-vehicle collation system 100 of the present embodiment can prevent the unlocking operation of the door lock of the vehicle from being illegally permitted.

Further, in the present embodiment, in addition to the collation of the electronic key 2 being established, the fact that the movement locus is a normal locus is also a condition for permitting the drive source to be turned on.

When a legitimate user carrying the electronic key 2 is outside the vehicle when the unauthorized person presses the push start button, but is located at a distance capable of collation processing with the in-vehicle collation system 100. , The latest position of the electronic key 2 indicated by the movement locus is not in the vehicle. Therefore, it is determined that the movement locus is not normal. Therefore, turning on the drive source is not allowed. As a result, it is possible to further prevent the vehicle 3 from being stolen by an unauthorized person.

Further, in the present embodiment, polling is performed by radio waves in the RF band, and the vehicle-mounted collation system 100 receives a position estimation signal to be transmitted when the electronic key 2 receives the polling signal, and the electronic key 2 is used. Perform position estimation. As a result, the movement locus can be created from the state where the electronic key 2 is located outside the vehicle exterior collation area Ao, so that a long movement locus can be created. The longer the movement trajectory, the more difficult it is for a fraudster to imitate a normal movement trajectory. Therefore, it is possible to further prevent an unauthorized person from opening the door.

Further, in the present embodiment, when the electronic key 2 receives the polling signal, the position estimation signal is periodically transmitted for a certain period of time, and the vehicle-mounted collation system 100 periodically transmits the position estimation signal. While receiving, the polling signal was not transmitted. As a result, the number of times the polling signal is transmitted can be reduced as compared with the case where the position estimation signal is transmitted once each time the polling signal is received. Therefore, the power consumption can be reduced.

Although the embodiments have been described above, the disclosed technology is not limited to the above-described embodiment, and the following modifications are also included in the disclosed scope, and further, within the scope not deviating from the gist other than the following. It can be changed in various ways.

<Modification 1>
In the embodiment, the RF band radio wave is used for both the transmission of the radio wave from the vehicle-mounted collation system 100 to the electronic key 2 and the transmission of the radio wave from the electronic key 2 to the vehicle-mounted collation system 100. However, as in the conventional case, the radio wave in the LF band may be used for transmitting the radio wave from the vehicle-mounted collation system 100 to the electronic key 2.

<Modification 2>
In the embodiment, when the electronic key 2 receives the polling signal, the electronic key 2 periodically transmits a position estimation signal for a preset transmission period (that is, a fixed time), and the vehicle-mounted collation system 100 periodically transmits the position estimation signal. If the signal is being received, the polling signal is not transmitted.

However, the vehicle-mounted collation system 100 periodically transmits a polling signal regardless of whether or not the position estimation signal is received, and each time the electronic key 2 receives the polling signal, the position estimation signal is transmitted once. It may be sent.

<Modification 3>
In the embodiment, the intersection of the arrival direction lines L1 and L2 determined by using the two array antennas 110 and 130, respectively, is estimated as the position of the electronic key 2. However, the method of estimating the position of the electronic key 2 is not limited to the method of using the array antennas 110 and 130. For example, the position of the electronic key 2 may be estimated by a position measurement technique using UWB. Further, the position of the electronic key 2 may be estimated by estimating the arrival direction of the radio wave with one array antenna and estimating the distance by RSSI.

<Modification example 4>
In the embodiment, the movement locus of the electronic key 2 is updated at regular intervals regardless of the distance between the vehicle 3 and the electronic key 2. However, when the electronic key 2 is far from the vehicle 3, the update cycle of the movement locus may be longer than when the electronic key 2 is near the vehicle 3. For example, when the electronic key 2 is outside the vehicle exterior collation area Ao, the update cycle of the movement locus may be longer than when the electronic key 2 is inside the vehicle exterior collation area Ao.

<Modification 5>
In the embodiment, when it is determined that the unlock operation has been performed in S6 of FIG. 3, it is determined whether or not the transfer locus created at that time is normal. However, when it is determined that the unlock operation has been performed, the position may be further estimated and the movement locus may be updated. Then, it may be determined whether the movement locus when the unlock operation is performed, that is, the movement locus including before and after the time when the unlock operation is performed, is moving or stopped. .. In this case, when the movement locus indicates that the electronic key 2 is stopped when the unlock operation is performed, it is determined that the movement locus is normal. This is because the user carrying the electronic key 2 should be stopped when the unlock operation is performed.

On the other hand, when an unauthorized person relays the radio wave emitted by the electronic key 2 using the relay device, it is possible that the user carrying the electronic key 2 is walking. That is, when an unauthorized person is relaying the radio wave emitted by the electronic key 2 using the relay device, the electronic key 2 may be moving.

Therefore, when the movement locus indicates that the electronic key 2 is stopped when the unlock operation is performed, it is determined that the movement locus is normal, and the door of the vehicle 3 is determined by an unauthorized person. It is possible to further prevent the lock from being unlocked.

<Modification 6>
Further, the movement locus may be created by a part of the estimated position without creating the movement locus by using all the estimated positions. For example, the movement locus may be created using only the estimated position when entering the out-of-vehicle collation area Ao. Further, the position of the electronic key 2 may be estimated only for a certain period of time or a certain number of times after entering the out-of-vehicle collation area Ao.

<Modification 7>
When the collation process is performed before the unlock operation is performed, the time for permitting the unlock may be limited to a certain time from the time when the collation is established and the movement locus is determined to be normal.

1: Electronic key system for vehicles 2: Electronic keys 3: Vehicles 5: Door lock ECU 6: Power supply ECU 21: Communication unit 22: Locking switch 23: Unlocking switch 24: Key control unit 100: In-vehicle collation system 110: First Array antenna 111: Antenna element 120: First communication unit 130: Second array antenna 131: Antenna element 140: Second communication unit 150: Collation ECU 151: Position estimation unit 152: Trajectory determination unit 153: Judgment unit 154: Authorization unit 160: Unlock sensor 170: Lock sensor 180: Push start button Ai: In-vehicle collation area Ao: Out-of-vehicle collation area L1: Arrival direction line L2: Arrival direction line

Claims (6)

A vehicle collation system that communicates with an electronic key (2) carried by a user of a vehicle (3) to determine whether or not the electronic key collation is established.
The communication unit (120, 140) that receives the position estimation signal transmitted by the electronic key in the RF band radio wave, and
A position estimation unit (151) that estimates the position of the electronic key based on the position estimation signal received by the communication unit, and a position estimation unit (151).
A locus determination unit (152) that determines the movement trajectory of the electronic key based on the position of the electronic key sequentially estimated by the position estimation unit, and
A determination unit (153) for determining whether or not the movement locus determined by the locus determination unit is a normal locus when the user carrying the electronic key walks and approaches the vehicle.
The permission unit (154) that permits the unlocking operation of the door lock of the vehicle based on the fact that the collation of the electronic key is established and the determination unit determines that the movement locus is the normal locus. ) And
The vehicle collation system includes a locus that approaches the vehicle sequentially from the outside of the vehicle exterior collation area as the normal locus . The permission unit indicates that the electronic key is moving on the movement locus when the button (180) installed in the vehicle interior of the vehicle and turning on the drive source of the vehicle is operated. If the electronic key is collated, the vehicle collation system according to claim 1 does not allow the drive source to be turned on. The permission unit determined that the electronic key collation was established, and the determination unit determined that the movement locus was the normal locus, and further, the door of the vehicle was unlocked. The vehicle collation system according to claim 1 or 2, wherein the movement locus sometimes permits the unlocking operation of the door lock of the vehicle based on the fact that the electronic key is stopped. .. A vehicle electronic key system including the vehicle collation system according to any one of claims 1 to 3 and the electronic key.
The communication unit of the vehicle collation system periodically transmits a polling signal requesting a response to the electronic key by radio waves in the RF band.
The electronic key is a vehicle electronic key system that transmits the position estimation signal to the vehicle collation system based on the reception of the polling signal. After receiving the polling signal, the electronic key periodically transmits the position estimation signal for a certain period of time.
The electronic key system for a vehicle according to claim 4, wherein the communication unit stops transmission of the polling signal when the position estimation signal is periodically received. The communication unit periodically transmits the polling signal,
The electronic key system for a vehicle according to claim 4, wherein the electronic key transmits the position estimation signal when the polling signal is received.

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