Vehicle authentication system

Abstract

Provided is a vehicular authentication system which can further improve a crime prevention effect while preventing signal processing from being complicated.　The present invention comprises: a vehicle-side detection means 3 which can detect an event that has occurred due to the behavior of a passenger; a mobile machine-side detection means 4 which is disposed on a mobile machine 2 and can detect an event that has occurred due to the behavior of the passenger and transmit the event to an in-vehicle unit 1; and a determination means 5 which can determine whether the event detected by the vehicle-side detection means 3 and the event transmitted from the mobile machine-side detection means 4 are detected at the same timing, and the engine of the vehicle is enabled to start or the vehicle is enabled to travel under a condition that the determination means 5 determines the event detected by the vehicle-side detection means 3 to be detected at the same timing as the event transmitted from the mobile machine-side detection means 4.

Description

Technical Field

[0001] The present invention relates to a vehicle authentication system having an in-vehicle unit mounted on a vehicle and a portable device that can be carried by a passenger and wirelessly transmit predetermined information to the in-vehicle unit, and enabling wireless communication for authentication between the in-vehicle unit and the portable device.

Background Art

[0002] There is a widespread vehicle authentication system that includes a portable device that can be carried by a passenger such as a driver and transmit a vehicle-specific authentication code by radio waves, and an in-vehicle unit that can receive the transmitted authentication code, and permits the start of the vehicle engine on the condition that the authentication code wirelessly transmitted from the portable device is a legitimate authentication code. In such a vehicle authentication system, there has been a problem that no effective countermeasure can be taken against a so-called relay attack in which a third party illegally relays the communication between the portable device and the in-vehicle unit using a repeater.

[0003] Conventionally, various countermeasures have been proposed to prevent such illegal relay attacks. For example, measuring the time until a low-frequency signal is received by the portable device, changing the frequency of the high-frequency signal, changing the intensity of the transmitted radio wave, and the like. Also, as a conventional technique, for example, as disclosed in Patent Document 1, it has been proposed to prevent illegal relay attacks by using a portable device that can modulate an authentication code by a plurality of modulation methods.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the conventional vehicle authentication system, since the authentication code needs to be modulated by a plurality of modulation methods, the communication between the vehicle-mounted unit and the portable device becomes complicated, and the authentication process takes a long time due to the complicated signal processing. Also, there is a problem that it is not possible to reliably prevent a fraudulent act called a relay attack.

[0006] The present invention has been made in consideration of the above circumstances, and has an object to provide a vehicle authentication system that can further improve the crime prevention effect while avoiding the signal processing from becoming complicated. [Means for solving the problem]

[0007] The invention described in claim 1 is a vehicle authentication system having an on-board unit mounted on a vehicle, and a portable device that can be carried by a passenger and can wirelessly transmit predetermined information to the on-board unit, wherein wireless communication for authentication is possible between the on-board unit and the portable device, the system comprising: a vehicle side detection means arranged in the on-board unit and capable of detecting an event caused by the behavior of the passenger; a portable device side detection means arranged in the portable device and capable of detecting an event caused by the behavior of the passenger and transmitting the event to the on-board unit; and a judgment means arranged to judge whether the event detected by the vehicle side detection means and the event transmitted from the portable device side detection means were detected at the same timing, and is capable of starting the vehicle's drive source or allowing the vehicle to run, on the condition that the judgment means judges that the event detected by the vehicle side detection means and the event transmitted from the portable device side detection means were detected at the same timing.

[0008] The invention described in claim 2 is characterized in that, in the vehicle authentication system described in claim 1, the vehicle-mounted unit and the portable device each have time information, and the determination means is capable of determining whether an event detected by the vehicle-side detection means and an event transmitted from the portable device-side detection means are detected at the same timing by synchronizing the time information.

[0009] The invention described in claim 3 is characterized in that, in the vehicle authentication system described in claim 1 or claim 2, the event caused by the behavior of the occupant detected by the vehicle side detection means and the portable device side detection means comprises an impact or vibration caused when the occupant boards the vehicle.

[0010] The invention according to claim 4 is characterized in that in the vehicle authentication system according to claim 3, the shock or vibration occurs when a passenger sits on a seat of the vehicle.

[0011] The invention described in claim 5 is characterized in that, in the vehicle authentication system described in claim 3 or claim 4, the vehicle side detection means and the portable device side detection means are composed of acceleration sensors arranged in the vehicle-mounted unit and the portable device, respectively, and are capable of detecting the impact or vibration.

[0012] The invention described in claim 6 is characterized in that, in the vehicle authentication system described in claim 1 or claim 2, the event caused by the behavior of the occupant detected by the vehicle side detection means and the portable device side detection means comprises a voice or sound emitted by the occupant.

[0013] The invention described in claim 7 is characterized in that, in the vehicle authentication system described in claim 6, the vehicle side detection means and the portable device side detection means are composed of microphones arranged in the vehicle-mounted unit and the portable device, respectively, and are capable of detecting the voice or sound.

[0014] The invention described in claim 8 is characterized in that, in the vehicle authentication system described in any one of claims 1 to 7, the portable device is a smartphone having a function capable of detecting events caused by the behavior of a passenger.

[0015] The invention described in claim 9 is characterized in that, in the vehicle authentication system described in any one of claims 1 to 8, the vehicle-mounted unit and the portable device are capable of starting the vehicle's drive source or allowing the vehicle to run, provided that an event detected by the vehicle-side detection means and an event transmitted from the portable device-side detection means are detected at the same timing and the authentication code wirelessly transmitted from the portable device is a legitimate authentication code. Effect of the Invention

[0016] According to the invention of claim 1, it is possible to start the vehicle's drive source or allow the vehicle to run on the condition that the judgment means judges that the event detected by the vehicle-side detection means and the event transmitted from the portable device-side detection means are detected at the same timing, thereby further improving the crime prevention effect while avoiding the signal processing from becoming complicated.

[0017] According to the invention of claim 2, the vehicle-mounted unit and the portable device each have time information, and the determination means synchronizes the time information to determine whether an event detected by the vehicle-side detection means and an event transmitted from the portable device-side detection means are detected at the same timing, thereby further improving authentication accuracy.

[0018] According to the invention of claim 3, the event caused by the occupant's behavior detected by the vehicle-side detection means and the portable device-side detection means consists of the impact or vibration that occurs when the occupant boards the vehicle, so authentication can be performed without requiring any action separate from the boarding action.

[0019] According to the invention of claim 4, the impact or vibration occurs when the passenger sits in the vehicle seat, so authentication is performed with the passenger seated in the seat, making it possible to start the vehicle's drive source or to run the vehicle, thereby improving safety.

[0020] According to the invention of claim 5, the vehicle-side detection means and the portable device-side detection means are composed of acceleration sensors respectively arranged in the in-vehicle unit and the portable device, and can detect impacts or vibrations. Therefore, the impacts or vibrations generated by the behavior of the passenger can be accurately detected by the acceleration sensors, and the authentication accuracy can be improved.

[0021] According to the invention of claim 6, the event generated by the behavior of the passenger detected by the vehicle-side detection means and the portable device-side detection means consists of the voice or sound emitted by the passenger. Therefore, authentication can be performed by the passenger generating voice or sound, and authentication can be performed without requiring special operations.

[0022] According to the invention of claim 7, the vehicle-side detection means and the portable device-side detection means are composed of microphones respectively arranged in the in-vehicle unit and the portable device, and can detect the voice or sound. Therefore, the voice or sound emitted by the passenger can be accurately detected by the microphone, and the authentication accuracy can be improved.

[0023] According to the invention of claim 8, the portable device is composed of a smartphone having a function capable of detecting an event generated by the behavior of the passenger. Therefore, it is not necessary to carry a dedicated electronic key for the vehicle or the like, and usually, the smartphone that the passenger always carries can be utilized for authentication.

[0024] According to the invention of claim 9, the in-vehicle unit and the portable device detect an event generated by the behavior of the passenger, and on the condition that the authentication code wirelessly transmitted from the portable device is a legitimate authentication code, the start of the drive source of the vehicle or the running of the vehicle can be enabled. Therefore, the security effect can be further improved.

Brief Description of the Drawings

[0025] [Figure 1] Block diagram showing a vehicle authentication system according to an embodiment of the present invention [Diagram 2] Graph showing signals for authentication detected by the vehicle-side detection means and the portable device-side detection means of the vehicle authentication system [Diagram 3] A flowchart showing the control of the vehicle authentication system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the wireless communication system of this embodiment comprises an in-vehicle unit 1 mounted on a vehicle such as a motorcycle, and a portable device 2 that can be carried by a passenger such as a driver, and wireless communication for authentication is possible between the in-vehicle unit 1 and the portable device 2. This is a so-called keyless entry system that can permit the starting of an engine, which is the driving source of the vehicle, or enable the vehicle to run based on the authentication.

[0027] The vehicle-mounted unit 1 is fixed to a predetermined location on the vehicle and includes a vehicle-side detection means 3, a determination means 5, a clock means 6 capable of acquiring time (clock) information, a wireless communication means 8 having an antenna A1 formed thereon, and a vehicle communication means 12. The vehicle-mounted unit 1 is also connected to an in-vehicle battery B via a protection circuit 11, and is adapted to be supplied with power from the in-vehicle battery B.

[0028] The portable device 2 is made up of parts that can be carried by the passenger and can wirelessly transmit predetermined information to the vehicle-mounted unit 1, and is configured to include a portable device side detection means 4, a clock means 7 capable of acquiring time (clock) information, a memory means 14 in which a vehicle-specific authentication code is stored, a control means 10 consisting of a microcomputer or the like, a wireless communication means 9 having an antenna A2 formed thereon, and a battery D as a power source. The vehicle-mounted unit 1 and the portable device 2 are capable of wireless communication by transmitting and receiving predetermined signals via the antenna A1 of the vehicle-mounted unit 1, the antenna A2 of the portable device 2, and the wireless communication means 8 and 9. Note that the wireless communication between the vehicle-mounted unit 1 and the portable device 2 may be any communication method (such as communication according to a general-purpose communication standard).

[0029] The vehicle side detection means 3 is arranged in the in-vehicle unit 1 and is composed of a sensor capable of detecting an event caused by the behavior of the occupant, and in this embodiment is composed of an acceleration sensor capable of detecting impact or vibration. The portable device side detection means 4 is arranged in the portable device 2 and is composed of a sensor capable of detecting an event caused by the behavior of the occupant and transmitting the detected event to the in-vehicle unit 1, and in this embodiment is composed of an acceleration sensor capable of detecting impact or vibration.

[0030] Here, the event caused by the passenger's behavior detected by the vehicle-side detection means 3 and the portable-device-side detection means 4 is composed of the impact or vibration caused when the passenger gets into the vehicle, and the impact or vibration occurs when the passenger sits in the vehicle seat. That is, the passenger's behavior in this case is sitting in the seat, and the event caused by that behavior is the impact or vibration that occurs with sitting in the seat and is transmitted to the in-vehicle unit 1 and the portable device 2.

[0031] The detection value detected by the portable-device-side detection means 4 is wirelessly transmitted from the antenna A2 of the wireless communication means 9 to the in-vehicle unit 1 together with a vehicle-specific authentication code and time information of the clock means 7 (time information when an event caused by the behavior of a passenger is detected). The vehicle-specific authentication code, the detection value detected by the portable-device-side detection means 4, and the time information are received by the antenna A1 of the wireless communication means 8 in the in-vehicle unit 1.

[0032] The determination means 5 is composed of a microcomputer or the like arranged in the in-vehicle unit 1, and is capable of determining whether the authentication code transmitted from the portable device 2 is a regular authentication code or not, and determining whether the event detected by the vehicle-side detection means 3 and the event transmitted from the portable device-side detection means 4 are detected at the same timing. That is, the in-vehicle unit 1 and the portable device 2 according to this embodiment have time information by the clock means 6 and 7, respectively. Then, the determination means 5 is capable of determining whether the event detected by the vehicle-side detection means 3 (shock or vibration detected on the in-vehicle unit 1 side in association with sitting on the seat) and the event transmitted from the portable device-side detection means 4 (shock or vibration detected on the portable device 2 side in association with sitting on the seat) are detected at the same timing by synchronizing the time information.

[0033] Specifically, as shown in Fig. 2, when a passenger sits on a vehicle seat and shock or vibration caused by the passenger's sitting is transmitted to the in-vehicle unit 1, the vehicle side detection means 3 consisting of an acceleration sensor acquires a signal α that detects the shock or vibration at time t1, and when the shock or vibration caused by the passenger's sitting is transmitted to the portable device 2, the portable device side detection means 4 consisting of an acceleration sensor acquires a signal β that detects the shock or vibration at time t1. Then, the signal α is transmitted to the determination means 5, and the signal β is transmitted to the determination means 5 via the antennas A1 and A2. At the same time, the portable device 2 transmits the authentication code stored in the memory means 14 from the antenna A2. The in-vehicle unit 1 receives the authentication code at the antenna A1 and sends it to the determination means 5.

[0034] The determination means 5 synchronizes the time information and compares the detection time of the signal α (the time when the vehicle-side detection means 3 detects the impact or vibration) with the detection time of the signal β (the time when the portable-unit detection means 4 detects the impact or vibration), and determines whether these detection times are the same, that is, whether the event detected by the vehicle-side detection means 3 and the event transmitted from the portable-unit detection means 4 are at the same timing. At the same time, it also determines whether the authentication code received from the portable unit 2 is a legitimate authentication code.

[0035] Thus, the in-vehicle unit 1 is configured to enable the start of the drive source (engine) of the vehicle on condition that the determination means 5 determines that the event detected by the vehicle-side detection means 3 and the event transmitted from the portable-device detection means 4 have the same timing and that the authentication code received from the portable device is a legitimate authentication code. That is, when the determination means 5 determines that the event detected by the vehicle-side detection means 3 and the event transmitted from the portable-device detection means 4 have the same timing and that the authentication code received from the portable device is a legitimate authentication code, the in-vehicle unit 1 is configured to transmit an authorization signal to an ECU (engine control unit) 13 mounted on the vehicle via the vehicle communication means 12 to permit the start of the drive source (engine).

[0036] On the other hand, if the determination means 5 does not determine that the event detected by the vehicle-side detection means 3 and the event transmitted from the portable-device detection means 4 are at the same timing, even if an authentication code is received from the portable device 2 and determined to be a regular authentication code, an authorization signal is not transmitted to the ECU 13 and starting of the drive source (engine) is not permitted (prohibited). Note that the vehicle may be configured to be able to travel by releasing the steering lock, etc. of the vehicle, on the condition that the determination means 5 determines that the event detected by the vehicle-side detection means 3 and the event transmitted from the portable-device detection means 4 are at the same timing.

[0037] Next, the control content according to this embodiment will be described with reference to the flowchart of FIG. Before authentication, the in-vehicle unit 1 is in a polling state, and power is supplied intermittently. Then, in S1, it is determined whether communication with the portable device 2 is possible, and if it is determined that communication is possible, an authentication code is transmitted from the portable device 2 in S2, and the authentication code is compared with a regular authentication code in the determination means 5. Next, in S3, the vehicle-side detection means 3 detects a signal α (a signal indicating that the vehicle-side detection means 3 has detected an impact or vibration at time t1), and then in S4, the portable-device detection means 4 detects a signal β (a signal indicating that the portable-device detection means 4 has detected an impact or vibration at time t1).

[0038] Thereafter, the signal α and time information from the clock means 6, and the signal β and time information from the clock means 7 are transmitted to the determination means 5, and in S5, the determination means 5 compares the signals α and β while synchronizing the time information as shown in Fig. 2. Then, in S6, it is determined whether the event detected by the vehicle side detection means 3 and the event transmitted from the portable device side detection means 4 were detected at the same timing (i.e., whether the timing of t1 in Fig. 2 matches), and if it is determined that they are at the same timing, the process proceeds to S7 where the engine start is permitted, and if it is determined that they are not at the same timing, the process proceeds to S8 where the series of controls ends.

[0039] Next, a vehicle authentication system according to another embodiment of the present invention will be described. As in the previous embodiment, the wireless communication system of this embodiment, as shown in FIG. 1, comprises an on-vehicle unit 1 mounted on a vehicle such as a motorcycle, and a portable device 2 that can be carried by a passenger such as a driver, and wireless communication for authentication is possible between the on-vehicle unit 1 and the portable device 2. This is what is called a keyless entry system, which can permit the starting of an engine, which is the driving source of the vehicle, or enable the vehicle to run based on the authentication.

[0040] In this embodiment, the event caused by the passenger's behavior detected by the vehicle-side detection means 3 and the portable-device-side detection means 4 is considered to consist of the voice or sound emitted by the passenger. That is, the passenger's behavior in this case is the passenger's act of emitting voice or sound, and the event caused by that behavior is the passenger's voice or sound transmitted to the in-vehicle unit 1 and the portable device 2.

[0041] The vehicle-side detection means 3, like the previous embodiment, is arranged in the in-vehicle unit 1 and is composed of a sensor capable of detecting an event caused by the behavior of the occupant, and in this embodiment, is composed of a microphone capable of detecting voice or sound. The portable-device-side detection means 4, like the previous embodiment, is arranged in the portable device 2 and is composed of a sensor capable of detecting an event caused by the behavior of the occupant and transmitting the detected event to the in-vehicle unit 1, and in this embodiment, is composed of a microphone capable of detecting voice or sound.

[0042] Similarly to the previous embodiment, the detection value detected by the portable device-side detection means 4 is wirelessly transmitted from the antenna A2 of the wireless communication means 9 to the in-vehicle unit 1 together with time information of the clock means 7 (time information of when an event caused by the behavior of a passenger is detected). The detection value and time information detected by the portable device-side detection means 4 are then received by the antenna A1 of the wireless communication means 8 in the in-vehicle unit 1.

[0043] The determination means 5 is composed of a microcomputer or the like arranged in the in-vehicle unit 1, and is capable of determining whether the authentication code transmitted from the portable device 2 is a legitimate authentication code or not, and of determining whether the event detected by the vehicle-side detection means 3 and the event transmitted from the portable device-side detection means 4 are detected at the same timing. That is, the in-vehicle unit 1 and the portable device 2 according to this embodiment have time information by clock means 6 and 7, respectively. Then, the determination means 5 is capable of determining whether the event detected by the vehicle-side detection means 3 (voice or sound made by the passenger detected on the in-vehicle unit 1 side) and the event transmitted from the portable device-side detection means 4 (voice or sound made by the passenger detected on the portable device 2 side) are detected at the same timing, by synchronizing the time information.

[0044] Specifically, as shown in Fig. 2, when a passenger sits in a vehicle seat and a voice or sound made by the passenger is transmitted to the in-vehicle unit 1, the vehicle-side detection means 3 consisting of a microphone acquires a signal α that detects the voice or sound at time t1, and when the voice or sound made by the passenger is transmitted to the portable device 2, the portable device-side detection means 4 consisting of a microphone acquires a signal β that detects the voice or sound at time t1. Then, the signal α is transmitted to the determination means 5, and the signal β is transmitted to the determination means 5 via antennas A1 and A2. At the same time, an authentication code is transmitted from the antenna A2 of the portable device 2 and transmitted to the determination means 5 via the antenna A1.

[0045] The determination means 5 synchronizes the time information and compares the detection time of the signal α (the time when the vehicle-side detection means 3 detects the voice or sound) with the detection time of the signal β (the time when the portable-unit detection means 4 detects the voice or sound) to determine whether these detection times are the same, that is, whether the event detected by the vehicle-side detection means 3 and the event transmitted from the portable-unit detection means 4 are at the same timing. At the same time, the determination means 5 determines whether the authentication code received from the portable unit 2 is legitimate.

[0046] However, similarly to the previous embodiment, the in-vehicle unit 1 is configured to enable the start of the drive source (engine) of the vehicle on condition that the determination means 5 determines that the event detected by the vehicle side detection means 3 and the event transmitted from the portable device side detection means 4 have the same timing, and furthermore, the authentication code received from the portable device is a regular authentication code. That is, when the determination means 5 determines that the event detected by the vehicle side detection means 3 and the event transmitted from the portable device side detection means 4 have the same timing, and furthermore, determines that the authentication code received from the portable device is a regular authentication code, the in-vehicle unit 1 is configured to transmit an authorization signal to an ECU (engine control unit) 13 mounted on the vehicle via the vehicle communication means 12, and to permit the start of the drive source (engine).

[0047] According to the above embodiment, it is possible to start the vehicle's drive source or allow the vehicle to run on condition that the determination means 5 determines that the event detected by the vehicle-side detection means 3 and the event transmitted from the portable device-side detection means 4 are detected at the same timing, thereby further improving the crime prevention effect while avoiding the signal processing from becoming complicated.

[0048] In addition, the vehicle-mounted unit 1 and the portable device 2 in this embodiment each have time information, and the determination means 5 synchronizes the time information to determine whether an event detected by the vehicle-side detection means 3 and an event transmitted from the portable device-side detection means 4 are detected at the same timing, thereby further improving authentication accuracy.

[0049] In particular, when the event caused by the passenger's behavior detected by the vehicle-side detection means 3 and the portable-device-side detection means 4 is an impact or vibration that occurs when the passenger gets into the vehicle, authentication can be performed without requiring any action separate from the boarding action. Also, when the impact or vibration occurs when the passenger gets into the vehicle seat, authentication is performed with the passenger in the seat, which makes it possible to start the drive source of the vehicle or to run the vehicle, thereby improving safety.

[0050] Furthermore, if the vehicle-side detection means 3 and the portable device-side detection means 4 are composed of acceleration sensors arranged in the vehicle-mounted unit 1 and the portable device 2, respectively, they can detect impacts or vibrations, so that the acceleration sensors can accurately detect impacts or vibrations caused by the behavior of the occupant, thereby improving authentication accuracy.

[0051] Furthermore, if the event caused by the behavior of the passenger detected by the vehicle-side detection means 3 and the portable-device-side detection means 4 is a voice or sound made by the passenger, authentication can be performed by the passenger making the voice or sound, and authentication can be performed without requiring any special action. In this case, if the vehicle-side detection means 3 and the portable-device-side detection means 4 are made of microphones arranged on the in-vehicle unit 1 and the portable device 2, respectively, and are capable of detecting voice or sound, the voice or sound made by the passenger can be detected with high accuracy by the microphones, thereby improving the accuracy of authentication.

[0052] In addition, the vehicle-mounted unit 1 and the portable device 2 can detect events caused by the behavior of the occupants, and can enable the vehicle's power source (engine) to start or the vehicle to run, provided that the authentication code wirelessly transmitted from the portable device 2 is a legitimate authentication code, thereby further improving the crime prevention effect.

[0053] Although the present embodiment has been described above, the present invention is not limited to this embodiment, and for example, the portable device 2 may be a smartphone having a function capable of detecting an event caused by the behavior of the passenger. In this case, it is not necessary to carry an electronic key dedicated to the vehicle, and the smartphone that is usually carried by the passenger at all times can be used for authentication. In addition, since many smartphones are usually equipped with an acceleration sensor and a microphone, the acceleration sensor and the microphone can be used as the portable device side detection means 4.

[0054] Furthermore, in addition to authenticating by determining whether an event detected by the vehicle-side detection means 3 and an event transmitted from the portable device-side detection means 4 are detected at the same timing as in the above embodiment, the vehicle-mounted unit 1 may be provided with an access switch, and authentication may be started on the condition that the access switch is operated. Also, authentication may not be performed by transmitting and receiving an authentication code. Note that, although this embodiment is applied to a two-wheeled vehicle, it may be applied to other vehicles such as ATVs, snowmobiles, construction machines or agricultural machines, and even automobiles. [Industrial Applicability]

[0055] As long as the vehicle authentication system is capable of starting the vehicle's drive source or allowing the vehicle to run, provided that the determination means determines that the event detected by the vehicle-side detection means and the event transmitted from the portable device-side detection means are detected at the same timing, the system may have a different external shape or may have other functions added. [Explanation of symbols]

[0056] 1 Vehicle-mounted unit 2. Portable Devices 3. Vehicle side detection means 4. Portable device side detection means 5 Judgment means 6. Clock means 7. Clock Means 8 Wireless communication means 9. Wireless communication means 10 Control Means 11 Protection circuit 12 Vehicle communication means 13 ECU D battery B Vehicle battery A1 Antenna A2 Antenna

Claims

1. An on-board unit mounted on a vehicle; a portable device that can be carried by a passenger and can wirelessly transmit predetermined information to the in-vehicle unit; A vehicle authentication system in which wireless communication for authentication between the vehicle-mounted unit and a portable device is possible, a vehicle side detection means arranged in the vehicle-mounted unit and capable of detecting an event caused by a behavior of a passenger; a portable device side detection means arranged in the portable device and capable of detecting an event caused by a behavior of a passenger and transmitting the event to the in-vehicle unit; a determination means for determining whether an event detected by the vehicle side detection means and an event transmitted from the portable device side detection means are detected at the same timing; and capable of enabling starting of a drive source of the vehicle or allowing the vehicle to run on condition that the determination means determines that an event detected by the vehicle-side detection means and an event transmitted from the portable-device-side detection means are detected at the same timing.

2. 2. The vehicle authentication system according to claim 1, wherein the in-vehicle unit and the portable device each have time information, and the determination means is capable of determining whether or not an event detected by the vehicle-side detection means and an event transmitted from the portable-device-side detection means are detected at the same timing by synchronizing the time information.

3. 3. The vehicle authentication system according to claim 1, wherein the event caused by the occupant's behavior detected by the vehicle-side detection means and the portable-device-side detection means comprises an impact or vibration caused when the occupant boards the vehicle.

4. 4. The vehicle authentication system according to claim 3, wherein the shock or vibration occurs when a passenger sits on a vehicle seat.

5. 5. The vehicle authentication system according to claim 3, wherein the vehicle side detection means and the portable device side detection means comprise acceleration sensors respectively arranged in the vehicle-mounted unit and the portable device, and are capable of detecting the shock or vibration.

6. 3. The vehicle authentication system according to claim 1, wherein the event caused by the occupant's behavior detected by the vehicle side detection means and the portable device side detection means is a voice or sound emitted by the occupant.

7. 7. The vehicle authentication system according to claim 6, wherein the vehicle side detection means and the portable device side detection means comprise microphones provided in the vehicle-mounted unit and the portable device, respectively, and are capable of detecting the voice or sound.

8. 8. The vehicle authentication system according to claim 1, wherein the portable device is a smartphone having a function capable of detecting an event caused by a behavior of a passenger.

9. The vehicle authentication system according to any one of claims 1 to 8, characterized in that the in-vehicle unit and the portable device are capable of starting a drive source of the vehicle or allowing the vehicle to run, on condition that an event detected by the vehicle-side detection means and an event transmitted from the portable device-side detection means are detected at the same timing, and the authentication code wirelessly transmitted from the portable device is a legitimate authentication code.

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