JP2020082862A - Radio communication system - Google Patents

Abstract

To provide a radio communication system capable of further improving a crime prevention effect by maintaining transmission and reception of a signal while avoiding complication of signal processing.SOLUTION: A radio communication system includes: an on-vehicle unit 1 which can wirelessly transmit an access signal by operating an access button 1a; a portable machine 2 which can wirelessly transmit an authentication code peculiar to a vehicle on condition that the access signal is received; and determination means 4 which can determine whether the authentication code is a normal authentication code on condition that the authentication code is received. The radio communication system can permit starting of a driving source of the vehicle or travel the vehicle when the authentication code is determined to be the normal authentication code by the determination means 4. In the radio communication system, a crime prevention mode for transmitting a camouflage signal different from the normal signal instead of the transmission of the authentication code by the portable machine 2 or the transmission of the access signal by the on-vehicle unit 1 can be set by a prescribed setting operation.SELECTED DRAWING: Figure 2

Description

The present invention relates to a wireless communication system capable of permitting start of a drive source of a vehicle or enabling traveling of a vehicle when the authentication code acquired by an in-vehicle unit is a legitimate authentication code.

Equipped with a portable device that can be carried by a passenger and that can transmit a vehicle-specific authentication code by radio waves, and an in-vehicle unit that can receive the transmitted authentication code, the authentication code wirelessly transmitted from the portable device is legitimate. A wireless communication system (so-called smart key system) that can permit unlocking of various locks of a vehicle and start of a drive source is in widespread use only when the authentication code is. In such a wireless communication system, when an access button provided on an in-vehicle unit is pressed, an access signal is wirelessly transmitted at a low frequency, and a portable device receiving the access signal wirelessly transmits an authentication code at a high frequency. In addition, when the authentication code is received by the vehicle-mounted unit, it is possible to determine whether the authentication code is a legitimate authentication code.

However, in the wireless communication system as described above, it is impossible to take effective measures against a so-called relay attack in which a third party illegally uses a repeater to perform communication between the portable device and the in-vehicle unit. There was a problem. That is, in communication between the mobile device and the onboard unit, a third party can easily demodulate the modulated signal. Is transmitted, the various locks of the vehicle can be released and the drive source of the vehicle can be started.

In order to prevent the illegal acts such as the above-mentioned relay attack, various measures have been conventionally proposed, for example, measuring the time until the low frequency signal is received by the portable device, changing the frequency of the high frequency signal. Measures such as changing the strength of the radio wave to be transmitted, and so on. Further, as a conventional technique, as disclosed in Patent Document 1, for example, it is proposed to prevent an illegal act such as a relay attack by using a portable device capable of modulating an authentication code by a plurality of modulation methods. There is.

JP, 2016-220088, A

However, in the conventional wireless communication system, the processing configuration of the signals communicated between the vehicle-mounted unit and the portable device becomes extremely complicated, and it takes a long time to perform the authentication process for the passenger having a legitimate portable device. However, there is a problem that the accuracy of the authentication process may be deteriorated, and it is not sufficient to more reliably prevent a so-called relay attack that is an illegal act.

On the other hand, the applicant can set the crime prevention mode in which the transmission of the authentication code by the portable device or the transmission of the access signal by the vehicle-mounted unit is set by a predetermined setting operation, and the authentication code or access is stopped until the crime prevention mode is released. We examined a configuration that maintains the signal transmission stop state.In that case, although it is possible to avoid complication of the signal processing, a third party who commits fraudulent activity may not be able to activate the crime prevention mode depending on the signal stop state. There was a risk that I would notice the existence.

The present invention has been made in view of such circumstances, and provides a wireless communication system capable of maintaining signal transmission/reception and further improving the crime prevention effect while avoiding complication of signal processing. To do.

According to a first aspect of the present invention, an in-vehicle unit, which is mounted on a vehicle, has an operation unit that can be arbitrarily operated by a passenger, and which can wirelessly transmit an access signal by operating the operation unit, and is carried by a passenger. If the access code is enabled and the authentication code is received, the portable code capable of wirelessly transmitting the authentication code unique to the vehicle and the authentication code are received. Wireless communication that can allow the start of the drive source of the vehicle or enable the vehicle to travel when the authentication code is determined to be a legitimate authentication code by the determination means. In the system, it is possible to set a crime prevention mode in which a camouflage signal different from a legitimate signal is transmitted instead of transmitting the authentication code by the portable device or transmitting the access signal by the vehicle-mounted unit by a predetermined setting operation. It is characterized by

According to a second aspect of the present invention, in the wireless communication system according to the first aspect, in the crime prevention mode, the camouflage signal is transmitted instead of the authentication code by the portable device, and the regular access signal by the vehicle-mounted unit is transmitted. Is transmitted.

According to a third aspect of the present invention, in the wireless communication system according to the first aspect, in the crime prevention mode, the camouflage signal is transmitted instead of the access signal by the vehicle-mounted unit, and the authentic authentication code by the portable device is transmitted. Is transmitted.

According to a fourth aspect of the present invention, in the wireless communication system according to the first aspect, in the crime prevention mode, the camouflage signal is transmitted instead of both the authentication code by the portable device and the access signal by the vehicle-mounted unit. Is characterized by.

According to a fifth aspect of the present invention, in the wireless communication system according to any one of the first to fourth aspects, the setting operation or the release operation of the crime prevention mode can be performed by an operation unit included in the portable device. Characterize.

According to a sixth aspect of the present invention, in the wireless communication system according to any one of the first to fourth aspects, the setting operation or the release operation of the crime prevention mode can be performed by the operation unit included in the vehicle-mounted unit. Is characterized by.

According to a seventh aspect of the present invention, in the wireless communication system according to any one of the first to sixth aspects, a storage unit capable of recording reception of the camouflaged signal by the vehicle-mounted unit or the portable device is provided. And

The invention according to claim 8 is the wireless communication system according to any one of claims 1 to 7, further comprising a notifying unit for notifying reception of the camouflaged signal by the vehicle-mounted unit or the portable device. To do.

According to the invention of claim 1, it is possible to set a crime prevention mode in which a camouflage signal different from a legitimate signal is transmitted in place of the transmission of the authentication code by the portable device or the transmission of the access signal by the vehicle-mounted unit by a predetermined setting operation. Therefore, it is possible to prevent the signal processing from becoming complicated and maintain the transmission and reception of the signal to further improve the crime prevention effect.

According to the invention of claim 2, in the crime prevention mode, the camouflage signal is transmitted instead of the authentication code by the portable device, and the regular access signal is transmitted by the vehicle-mounted unit, so that the signal processing function on the vehicle-mounted unit side is almost changed. It is possible to set the crime prevention mode without the need.

According to the invention of claim 3, in the crime prevention mode, the camouflage signal is transmitted instead of the access signal from the vehicle-mounted unit, and the regular authentication code is transmitted from the portable device, so that the signal processing function on the portable device side is almost changed. It is possible to set the crime prevention mode without the need.

According to the invention of claim 4, in the crime prevention mode, since the camouflage signal is transmitted instead of both the authentication code by the portable device and the access signal by the vehicle-mounted unit, either one of the authentication code and the access signal is replaced by the camouflage signal. The crime prevention effect can be further enhanced as compared with the case of transmitting by sending.

According to the invention of claim 5, the setting operation or the release operation of the crime prevention mode can be performed by the operation unit of the portable device, so that the driver carrying the portable device can remotely set or release the crime prevention mode. It can be performed and the operability can be improved.

According to the invention of claim 6, the setting operation or the release operation of the crime prevention mode can be performed by the operation means of the vehicle-mounted unit, so that the operation means for transmitting the access signal is used for setting or canceling the crime prevention mode. It can be used as a means, and the device configuration can be simplified.

According to the invention of claim 7, since the storage means capable of recording the reception of the camouflaged signal by the vehicle-mounted unit or the portable device is provided, it is possible to monitor the illegal act such as the relay attack based on the recording of the reception of the camouflaged signal. It is possible to further improve the crime prevention property.

According to the invention of claim 8, since the notifying means for notifying the reception of the camouflaged signal by the vehicle-mounted unit or the portable device is provided, it is possible to easily and in real time grasp a fraudulent act such as a relay attack.

Conceptual diagram showing a wireless communication system according to the first embodiment of the present invention (common to the second embodiment) Block diagram showing the wireless communication system The flowchart which shows the control at the time of setting the crime prevention mode in the same wireless communication system. Flowchart showing control at the time of authenticating an authentication code in the same wireless communication system (when transmitting a camouflage signal exclusively by a portable device) Flowchart showing control at the time of authenticating an authentication code in the same wireless communication system (when an impersonation signal is exclusively transmitted by an in-vehicle unit) Flowchart showing control at the time of authenticating the authentication code in the same wireless communication system (when transmitting the camouflage signal by both the portable device and the in-vehicle unit) The flowchart which shows the control at the time of canceling the crime prevention mode in the same wireless communication system. Block diagram showing a wireless communication system according to a second embodiment of the present invention The flowchart which shows the control at the time of setting the crime prevention mode in the same wireless communication system. The flowchart which shows the control at the time of canceling the crime prevention mode in the same wireless communication system. Schematic diagram showing a vehicle-side operation means in a wireless communication system according to another embodiment of the present invention

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
As shown in FIGS. 1 and 2, the wireless communication system according to the first embodiment includes a portable device 2 (electronic key) carried by a passenger and an on-vehicle unit 1 mounted on a vehicle such as a motorcycle. When the authentication code acquired by the vehicle-mounted unit 1 by wireless communication is a legitimate authentication code, it is a so-called smart key system that can permit the start of the engine that is the drive source of the vehicle or enable the vehicle to travel. It is a thing.

The portable device 2 is capable of wirelessly transmitting a vehicle-specific authentication code provided that the passenger can carry it and receives an access signal from the vehicle-mounted unit 1. As shown in FIG. 2a (operation unit), an LED 2b as a notification unit, a low-frequency antenna G1 including a coil capable of wirelessly receiving an access signal (low-frequency signal) from the in-vehicle unit 1, and an authentication code (high-frequency signal) in the in-vehicle unit 1. And a control means 14 electrically connected to the low-frequency antenna G1 and the high-frequency antenna G2, and a battery D.

The control means 14 is formed with a storage means 15 capable of storing a vehicle-specific authentication code, and can be operated by being supplied with power from the low-frequency antenna G1 when the battery D or the immobilizer function is activated. The vehicle-specific authentication code can be wirelessly transmitted by the high-frequency antenna G2 on condition that the access signal from No. 1 is received by the low-frequency antenna G1.

The in-vehicle unit 1 is mounted on a vehicle (a vehicle body of a motorcycle in the present embodiment), and as shown in FIG. 1, an access button 1a (operating means) and a lock bar L that can be arbitrarily operated by a passenger such as a driver. In addition, the access signal can be wirelessly transmitted to the portable device 2 by operating the access button 1a. As shown in FIG. 2, the vehicle-mounted unit 1 includes a control means 3, a motor M capable of driving the lock bar L (see FIG. 1), a low-frequency antenna F1, in addition to the access button 1a and the lock bar L. It has a high frequency antenna F2.

The motor M is electrically connected to the battery 9 mounted on the vehicle via the power supply control driver 10, is controllable by the motor driver 11, and can move the lock bar L. The lock bar L is inserted into a lock hole (not shown) formed in the handle bar of the vehicle to lock the handle bar, and an unlock position where the lock bar L retracts from the lock hole to unlock the handle bar. It is supposed to be movable between and.

That is, when the lock bar L is in the lock position, the handle bar is locked so that the vehicle cannot travel, and when the lock bar L is in the unlock position, the lock of the handle bar is released to prevent the vehicle from running. It enables running. Further, the position of the lock bar L can be detected by the position detection sensor 16, and the position (lock position or unlock position) of the lock bar L detected by the position detection sensor 16 is transmitted to the control means 3. It is possible.

The control unit 3 is electrically connected to the low-frequency antenna F1 via the low-frequency driver 12 and electrically connected to the high-frequency antenna F2 via the high-frequency driver 13, and controls the low-frequency signal of the low-frequency antenna F1. Control based on transmission and reception of a high frequency signal by the high frequency antenna F2 is possible. Further, the control means 3 is electrically connected to the access button 1a (operating means), and has an IPD for the ECU (engine control unit) 17 mounted on the vehicle and the left and right turn signals S (direction indicator lights). (Intelligent power device) 18 and the like are electrically connected.

Furthermore, the control means 3 according to the present embodiment can wirelessly transmit an access signal composed of a low frequency signal from the low frequency antenna F1 to the portable device 2 on condition that the access button 1a is pressed. It is possible to determine whether or not the received authentication code is a legitimate authentication code, on condition that the high-frequency antenna F2 receives the authentication code that is wirelessly transmitted from the portable device 2. Determining means 4, a setting means 5 for setting the crime prevention mode, a releasing means 6 for canceling the crime prevention mode, an immobilizer control means 7 for activating the immobilizer function, and a memory for storing a random number code and the like. And means 8.

The determination means 4 is formed in the control means 3 arranged in the in-vehicle unit 1, and the authentication code is authentic when the authentication code transmitted from the portable device 2 is received by the high frequency antenna F2. It is possible to determine whether or not it is an authentication code. When the authentication code received by the determination means 4 is determined to be authentic, the control means 3 controls the motor M to drive the lock bar L when the lock bar L is in the lock position. Is moved to the unlock position, and a permission signal is transmitted to the ECU 17 to permit the engine (driving source) to start (for example, permit the starter to operate). On the other hand, if the determination means 4 determines that the authentication code received is not authentic, the motor M is not driven, and the permission signal to the ECU 17 is not transmitted.

Here, the wireless communication system according to the present embodiment transmits a camouflage signal different from a legitimate signal in place of the transmission of the authentication code by the portable device 2 or the transmission of the access signal by the vehicle-mounted unit 1 by a predetermined setting operation. It is possible to set the crime prevention mode. Specifically, when a specific operation (for example, "long press operation" or "continuous press operation" different from normal operation) is performed on the access button 1a (operation means) of the vehicle-mounted unit 1, The crime prevention mode is set by the setting means 5, and instead of the access signal from the vehicle-mounted unit 1 or the authentication code from the portable device 2, a camouflage signal intentionally different from the regular signal is transmitted.

It is sufficient for the crime prevention mode to transmit a camouflage signal different from a legitimate signal in place of the transmission of the authentication code by the portable device 2 or the transmission of the access signal by the vehicle-mounted unit 1 by a predetermined setting operation. The first wireless communication system for transmitting the camouflage signal in place of the authentication code by the vehicle-mounted unit 1 and the legitimate access signal for the vehicle-mounted unit 1, transmitting the camouflage signal in place of the access signal for the vehicle-mounted unit 1, and by the portable device 2. Any of a second wireless communication system that transmits a legitimate authentication code and a third wireless communication system that transmits an impersonation signal instead of both the authentication code by the portable device 2 and the access signal by the vehicle-mounted unit 1 may be used.

Further, the predetermined operation for setting the crime prevention mode is not limited to a specific operation for the access button (operation means) of the vehicle-mounted unit 1 as in the present embodiment, but for the operation button 2a (operation unit) of the portable device 2. A specific operation (for example, “long press operation” or “continuous press operation” different from normal operation) may be performed. In addition, the operation button 2a (operation unit) may function as an operation unit for exclusively setting the crime prevention mode.

The canceling means 6 can cancel the crime prevention mode by performing a predetermined canceling operation on the operation button 2a (operation section) of the portable device 2. Then, when the crime prevention mode is released, the camouflage signal is not transmitted, and the regular authentication code by the portable device 2 and the regular access signal by the vehicle-mounted unit 1 are transmitted.

Further, the predetermined operation for canceling the crime prevention mode is not limited to a specific operation for the operation button 2a (operation unit) of the portable device 2 as in the present embodiment, but for the access button 1a (operation means) of the vehicle-mounted unit 1. Specific operation (for example, "long press operation" or "continuous press operation" different from normal operation) or operation means separately provided in the on-vehicle unit 1 or the vehicle (hidden hidden by a third party) (Preferably an operating means disposed at a position is preferable).

Further, in the present embodiment, when the crime prevention mode is set, the control unit 3 generates a random number code and stores it in the storage unit 8 of the vehicle-mounted unit 1 and the storage unit 15 of the portable device 2, and the release operation is performed. In the case of being broken, the random number code stored in the storage unit 15 of the portable device 2 is collated with the random number code stored in the storage unit 8 of the vehicle-mounted unit 2, and the crime prevention mode is released only when these random number codes match. It is supposed to do.

Further, the storage unit 8 and the storage unit 15 according to the present embodiment can record the reception of the camouflaged signal by the vehicle-mounted unit 1 or the portable device 2. For example, in the state where the crime prevention mode is set, if the reception of the camouflaged signal by the portable device 2 or the reception of the camouflaged signal by the vehicle-mounted unit 1 is recorded and stored in the storage unit 8 or the storage unit 15, and is used as a log, Fraud such as relay attack can be monitored in time series.

The immobilizer control means 7 is required to perform, for example, a predetermined operation (a unique operation different from the operation at the time of transmitting an access signal or the operation at the time of setting the crime prevention mode) on the access button 1a of the vehicle-mounted unit 1. As for, it is for enabling the immobilizer function. That is, for example, when the battery D of the portable device 2 is exhausted and power cannot be supplied, a specific operation is performed on the access button 1a in a state where the portable device 2 is brought close to the vehicle-mounted unit 1. The immobilizer control means 7 operates to transmit a low frequency to the portable device 2 to generate electric power at the low frequency antenna G1 and wirelessly transmit the authentication code with the electric power.

Further, the portable device 2 according to the present embodiment is provided with the LED 2b as a notification means, and the LED 2b can be turned on or blinked in the state where the crime prevention mode is set. Accordingly, it is possible to inform that the crime prevention mode is set by lighting or blinking the LED 2b. As described above, the LED 2b (notifying means) notifies the presence/absence of the setting of the crime prevention mode, and also displays an error (error during generation of a random number or the like, error during communication between the vehicle-mounted unit 1 and the portable device 2, etc.). (Including) may be notified.

Furthermore, the LED 2b as the notification means according to the present embodiment is supposed to notify the reception of the camouflaged signal by the vehicle-mounted unit 1 or the portable device 2. In this case, the reception of the camouflage signal may be notified while informing the setting of the crime prevention mode as described above, or the reception of the camouflage signal may be notified by a notification means separate from the LED 2b. Good. The notification means may be provided in the in-vehicle unit 1, and instead of the notification by lighting or blinking the LED 2b, a sound notification, a separate display means (not shown) (for example, a meter panel or a separate liquid crystal display panel, etc.). ) Or the like, or a notification of transmitting a signal to a specific network by a modem.

Next, the control content when setting the crime prevention mode in the wireless communication system according to the present embodiment will be described based on the flowchart of FIG. 3.
First, in S1, it is determined whether or not a predetermined setting operation (a specific operation for the access button 1a in the present embodiment) for setting the crime prevention mode is performed, and it is determined that the predetermined setting operation is performed. Then, the process proceeds to S2, in which the control means 3 generates a random number code and the low frequency antenna F1 wirelessly transmits the random number code to the portable device 2.

Then, in S3, the random number code is stored in the storage unit 8 of the vehicle-mounted unit 1 and the storage unit 15 of the portable device 2, respectively, and then in S4, the random number code is normally stored in the storage unit 8 of the vehicle-mounted unit 1. It is determined whether or not the random number code is normally stored in the storage unit 15 of the portable device 2 in S5. If it is determined that the random number code is not normally stored in either S4 or S5, the setting of the crime prevention mode is stopped in S7, and it is determined that the random number code is normally stored in both S4 and S5. Then, the process proceeds to S6, and the crime prevention mode is set by the setting means 5.

Next, in the case of authenticating the authentication code in the wireless communication system according to the present embodiment, the first wireless communication system (instead of transmitting the camouflage signal in place of the authentication code by the portable device 2 and transmitting by the vehicle-mounted unit 1 The control contents of the control signal (which transmits the access signal of 1) will be described based on the flowchart of FIG.
First, on the vehicle-mounted unit 1 side, it is determined whether or not an operation (one pressing operation) has been performed on the access button 1a (S1a). If it is determined that the operation is performed, the process proceeds to S2a, and the low frequency antenna F1 To wirelessly transmit an access signal (a preset regular access signal).

After that, when the authentication code transmitted from the portable device 2 side in S3a (including the preset authentic authentication code and the authentication code as the camouflage signal) is received by the high-frequency antenna F2, the process proceeds to S4a, and the determination unit 4 carries it. It is determined whether the authentication code from the machine 2 is a legitimate authentication code. When it is determined in S4a that the authentication code is legitimate, the process proceeds to S5a, where a permission signal is transmitted to the ECU 17 to permit the engine (driving source) to start.

If it is not determined in S4a that the authentication code is legitimate, the series of controls ends without performing S5a. Thereby, when the authentication code from the portable device 2 is a camouflaged signal, it is possible to prevent the engine from being started. In the present embodiment, in S5a, in addition to the transmission of the permission signal to the ECU 17, when the lock bar L is in the lock position, the motor M is driven to set the lock bar L to the unlock position and the vehicle can travel. I have to.

On the other hand, on the portable device 2 side, it is determined whether or not a preset regular access signal is received (S1b), and if it is determined that the regular access signal is received, the process proceeds to S2b, and the crime prevention mode is set. It is determined whether or not there is. Then, if it is determined in S2b that the crime prevention mode is not set, an authentication code (a preset authorized authentication code) is transmitted, and if it is determined in S2b that the crime prevention mode is set, An impersonation signal (an impersonation authentication code intentionally different from the legitimate authentication code) is transmitted instead of the legitimate authentication code.

As a result, when the crime prevention mode is set, a camouflage signal different from the legitimate authentication code is transmitted from the portable device 2. Therefore, the in-vehicle unit 1 side receiving the camouflage signal transmits the legitimate authentication code in S4a. Is not determined, the series of control ends without performing S5a. As a result, it is possible to prevent the engine from being started due to an illegal act such as a relay attack in the state where the crime prevention mode is set.

Next, in the case of authenticating the authentication code in the wireless communication system according to the present embodiment, the second wireless communication system (the camouflage signal is transmitted in place of the access signal by the vehicle-mounted unit 1 and the normal by the portable device 2 is transmitted). The control contents of the authentication code (for transmitting the authentication code of 1) will be described based on the flowchart of FIG.
First, on the vehicle-mounted unit 1 side, it is determined whether or not an operation (one pressing operation) has been performed on the access button 1a (S1a). When it is determined that the operation is performed, the process proceeds to S2a and the crime prevention mode is set. Is determined. When it is determined in S2a that the security mode is not set, an access signal (a preset regular access signal) is transmitted, and when it is determined in S2a that the security mode is set, Instead of the legitimate access signal, a camouflage signal (a camouflaged access signal intentionally made different from the legitimate access signal) is transmitted.

As a result, when the crime prevention mode is set, a camouflage signal different from the regular access signal is transmitted from the vehicle-mounted unit 1, so that the vehicle-mounted unit 1 side receiving the camouflaged signal transmits the legitimate access signal in S1b. Is not determined, and the portable device 2 does not transmit the authentication code. As a result, it is possible to prevent the engine from being started due to an illegal act such as a relay attack in the state where the crime prevention mode is set.

After that, when the authentication code transmitted from the portable device 2 side in S5a (a preset authentic authentication code) is received by the high frequency antenna F2, the process proceeds to S6a, and the authentication code from the portable device 2 is verified by the determination means 4. It is determined whether or not the authentication code. Then, when it is determined in S6a that the authentication code is legitimate, the process proceeds to S7a, where a permission signal is transmitted to the ECU 17 to permit the engine (driving source) to start. If it is not determined in S4a that the authentication code is legitimate, the series of controls ends without performing S6a.

On the other hand, on the portable device 2 side, it is determined whether or not a preset regular access signal is received (S1b), and if it is determined that the regular access signal is received, the process proceeds to S2b and the authentication code (preset Send a legitimate authorization code). That is, when the crime prevention mode is set, a camouflage signal different from the legitimate access signal is transmitted from the vehicle-mounted unit 1, so that the portable device 2 side that has received the camouflage signal has an authentication code (regular authentication code). Never send. Therefore, in the state where the crime prevention mode is set, it is possible to prevent the engine starting from being permitted by an illegal act such as a relay attack.

Next, in the case of authenticating the authentication code in the wireless communication system according to the present embodiment, in the third wireless communication system (the authentication code by the portable device 2 and the access signal by the vehicle-mounted unit 1 are replaced by the camouflage signal). The control contents of what is transmitted) will be described based on the flowchart of FIG.
First, on the vehicle-mounted unit 1 side, it is determined whether or not an operation (one pressing operation) has been performed on the access button 1a (S1a). When it is determined that the operation is performed, the process proceeds to S2a and the crime prevention mode is set. Is determined. When it is determined in S2a that the security mode is not set, an access signal (a preset regular access signal) is transmitted, and when it is determined in S2a that the security mode is set, Instead of the legitimate access signal, a camouflage signal (a camouflaged access signal intentionally made different from the legitimate access signal) is transmitted.

As a result, when the crime prevention mode is set, a camouflage signal different from the regular access signal is transmitted from the vehicle-mounted unit 1, so that the vehicle-mounted unit 1 side receiving the camouflaged signal transmits the legitimate access signal in S1b. Is not determined, and the portable device 2 does not transmit the authentication code. As a result, it is possible to prevent the engine from being started due to an illegal act such as a relay attack in the state where the crime prevention mode is set.

After that, when the authentication code transmitted from the portable device 2 side in S5a (a preset authentic authentication code) is received by the high frequency antenna F2, the process proceeds to S6a, and the authentication code from the portable device 2 is verified by the determination means 4. It is determined whether or not the authentication code. Then, when it is determined in S6a that the authentication code is legitimate, the process proceeds to S7a, where a permission signal is transmitted to the ECU 17 to permit the engine (driving source) to start. If it is not determined in S4a that the authentication code is legitimate, the series of controls ends without performing S6a.

On the other hand, on the portable device 2 side, it is determined whether or not a preset regular access signal is received (S1b), and if it is determined that the regular access signal is received, the process proceeds to S2b, and the crime prevention mode is set. It is determined whether or not there is. Then, if it is determined in S2b that the crime prevention mode is not set, an authentication code (a preset authorized authentication code) is transmitted, and if it is determined in S2b that the crime prevention mode is set, An impersonation signal (an impersonation authentication code intentionally different from the legitimate authentication code) is transmitted instead of the legitimate authentication code.

As a result, when the crime prevention mode is set, a camouflage signal different from the legitimate authentication code is transmitted from the portable device 2. Therefore, the in-vehicle unit 1 side that has received the camouflage signal transmits the legitimate authentication code in S6a. Is not determined, the series of control ends without performing S7a. As a result, it is possible to prevent the engine from being started due to an illegal act such as a relay attack in the state where the crime prevention mode is set.

Next, the control content when canceling the crime prevention mode in the wireless communication system according to the present embodiment will be described based on the flowchart of FIG. 7.
First, in S1, it is determined whether or not a pressing operation (predetermined release operation) on the operation button 2a of the portable device 2 is performed. If it is determined that the operation is performed, the process proceeds to S2 and the portable device 2 is operated. Receive a stored random code. That is, when the operation button 2a of the portable device 2 is operated, the random number code stored in the storage unit 15 of the portable device 2 is wirelessly transmitted by the high frequency antenna G2, and the random number code is transmitted to the high frequency antenna F2 of the vehicle-mounted unit 1. It is possible to receive at.

After that, in S3, the random number code stored in the storage unit 8 of the vehicle-mounted unit 1 and the random number code transmitted from the portable device 2 are collated by the control unit 3 and it is determined whether or not these random number codes match. To be done. When it is determined that the random number codes match with each other as a result of the collation of the random number codes, the process proceeds to S4, the crime prevention mode is canceled by the canceling unit 6, and it is determined that the random number codes do not match. , S5, the crime prevention mode is not canceled by the canceling means 6, and the crime prevention mode setting is continued.

Then, after the crime prevention mode is released, when a normal operation (one pressing operation) is performed on the access button 1a of the vehicle-mounted unit 1, an access signal is transmitted from the low-frequency antenna F1 of the vehicle-mounted unit 1, and the mobile phone is transmitted. The authentication code from the machine 2 may be judged by the judging means 4, or when the crime prevention mode is released, an access signal is automatically transmitted from the low-frequency antenna F1 of the vehicle-mounted unit 1 and the portable machine 2 You may make it the determination means 4 determine the authentication code from.

Thus, when the access button 1a needs to be operated after the security mode is released, the security effect can be enhanced, and the operability is improved when the authentication code is automatically determined. You can Further, it is preferable that the control that requires the operation of the access button 1a after the crime prevention mode is canceled and the control that automatically determines the authentication code can be arbitrarily selected.

Next, a wireless communication system according to the second embodiment of the present invention will be described.
As in the first embodiment, the wireless communication system according to the second embodiment is mounted on a portable device 2 (electronic key) carried by a passenger and a vehicle such as a motorcycle, as shown in FIGS. Wireless communication with the vehicle-mounted unit 1, and when the authentication code acquired by the vehicle-mounted unit 1 is a legitimate authentication code, the engine that is the drive source of the vehicle is permitted to start or the vehicle is allowed to run. It consists of a so-called smart key system. The same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the wireless communication system according to the present embodiment, the setting means 5 and the releasing means 6 in the first embodiment are formed in the control means 14 of the portable device 2 (electronic key). Here, the wireless communication system according to the present embodiment transmits a camouflage signal different from a legitimate signal in place of the transmission of the authentication code by the portable device 2 or the transmission of the access signal by the vehicle-mounted unit 1 by a predetermined setting operation. It is possible to set the crime prevention mode. Specifically, when a specific operation (for example, a “long press operation”, a “continuous press operation” or the like different from a normal operation) is performed on the operation button 2a (operation unit) of the portable device 2, The crime prevention mode is set by the setting means 5, and instead of the access signal from the vehicle-mounted unit 1 or the authentication code from the portable device 2, a camouflage signal intentionally different from the regular signal is transmitted.

It is sufficient for the crime prevention mode to transmit a camouflage signal different from a legitimate signal in place of the transmission of the authentication code by the portable device 2 or the transmission of the access signal by the vehicle-mounted unit 1 by a predetermined setting operation. The first wireless communication system for transmitting the camouflage signal in place of the authentication code by the vehicle-mounted unit 1 and the legitimate access signal for the vehicle-mounted unit 1, transmitting the camouflage signal in place of the access signal for the vehicle-mounted unit 1, and by the portable device 2. Any of a second wireless communication system that transmits a legitimate authentication code and a third wireless communication system that transmits an impersonation signal instead of both the authentication code by the portable device 2 and the access signal by the vehicle-mounted unit 1 may be used.

Further, the predetermined operation for setting the crime prevention mode is not limited to a specific operation for the access button (operation means) of the vehicle-mounted unit 1 as in the present embodiment, but for the operation button 2a (operation unit) of the portable device 2. A specific operation (for example, “long press operation” or “continuous press operation” different from normal operation) may be performed. In addition, the operation button 2a (operation unit) may function as an operation unit for exclusively setting the crime prevention mode.

The canceling means 6 can cancel the crime prevention mode by performing a predetermined canceling operation on the operation button 2a (operation section) of the portable device 2. Then, when the crime prevention mode is released, the camouflage signal is not transmitted, and the regular authentication code by the portable device 2 and the regular access signal by the vehicle-mounted unit 1 are transmitted.

Further, the predetermined operation for canceling the crime prevention mode is not limited to a specific operation for the operation button 2a (operation unit) of the portable device 2 as in the present embodiment, but for the access button 1a (operation means) of the vehicle-mounted unit 1. Specific operation (for example, "long press operation" or "continuous press operation" different from normal operation) or operation means separately provided in the on-vehicle unit 1 or the vehicle (hidden hidden by a third party) (Preferably an operating means disposed at a position is preferable).

Further, as in the first embodiment, when the crime prevention mode is set, the control unit 3 generates a random number code and stores it in the storage unit 8 of the vehicle-mounted unit 1 and the storage unit 15 of the portable device 2 and cancels it. When the operation is performed, the random number code stored in the storage unit 15 of the portable device 2 and the random number code stored in the storage unit 8 of the vehicle-mounted unit 2 are collated, and the crime prevention is performed only when these random number codes match. The mode may be canceled. In addition, in the present embodiment, the storage means 8 and 15 similar to those in the first embodiment are provided, and the LED 2b as the immobilizer function and the notification means is provided.

Here, in the present embodiment, selection means 19 is provided which can enable or disable a predetermined setting operation for setting the crime prevention mode in advance. The selecting means 19 includes, for example, an operation switch provided on the in-vehicle unit 1, the portable device 2, or the vehicle, and a predetermined setting operation for setting the crime prevention mode by the user operating the operation switch or the like in advance. The validity or invalidity of can be preset.

Next, the control content when setting the crime prevention mode in the wireless communication system according to the present embodiment will be described based on the flowchart of FIG. 9.
When a predetermined setting operation for setting the crime prevention mode (in the present embodiment, a specific operation for the operation button 2a (operation unit) of the portable device 2) is performed, setting is performed by the selection unit 19 on the in-vehicle unit 1 side. It is determined whether or not the operation is valid (S1), and if it is valid, the process proceeds to S2, and the crime prevention code signal is wirelessly transmitted to the portable device 2 through the low frequency antenna F1.

On the portable device 2 side, when the security code signal is received by the low frequency antenna G1 of the portable device 2 in S3, it is determined whether or not the received security code signal is correct (S4). If it is determined, the process proceeds to S5, and the high frequency antenna G2 of the portable device 2 transmits a crime prevention mode setting signal. After that, the process proceeds to S6, the crime prevention mode is set by the setting unit 5, and the process proceeds to S7, where the LED 2b arranged on the portable device 2, a separate display unit, or the like informs that the crime prevention mode is set. .. If it is determined in S4 that the crime prevention code signal is incorrect, the process proceeds to S8, and the crime prevention mode setting is canceled. In this case, you may make it notify that the setting of the crime prevention mode was stopped.

On the other hand, when the crime prevention mode setting signal is transmitted in S5, it is determined on the vehicle unit 1 side whether the crime prevention mode setting signal is received (S9), and when the crime prevention mode setting signal is correctly received, the process proceeds to S10. Proceeding, the notification that the crime prevention mode has been set is made by the LED arranged on the vehicle-mounted unit 1, a separate display means, or the like. When it is determined in S1 that the setting operation has been invalidated by the selection means 19, S2, S9, and S10 are skipped, and it is determined in S9 that the crime prevention mode setting signal is not correctly received. In this case, S10 is skipped.

Next, the control content when canceling the crime prevention mode in the wireless communication system according to the present embodiment will be described based on the flowcharts of FIGS. 10 and 4.
When the pressing operation (predetermined releasing operation) on the operation button 2a of the portable device 2 is performed, it is determined in Sa whether or not the releasing operation is performed. If there is the releasing operation, the process proceeds to Sb and the releasing means 6 is executed. When the crime prevention mode is canceled by and the cancel operation is not performed, the process proceeds to Sc and the crime prevention mode is continued. When the access button 1a is operated after the crime prevention mode is released in Sb, the same control A as in the first embodiment is performed.

That is, as shown in the flowchart of FIG. 4, the control A determines in S1a whether or not an operation (one pressing operation) has been performed on the access button 1a, and when it is determined that the operation is performed, In step S2a, the access signal is wirelessly transmitted by the low frequency antenna F1. After that, when the authentication code transmitted from the portable device 2 side is received by the high frequency antenna F2 in S3a, the process proceeds to S4a, and the determination unit 4 determines whether the authentication code from the portable device 2 is a proper authentication code. .. When it is determined in S4a that the authentication code is legitimate, the process proceeds to S5a, where a permission signal is transmitted to the ECU 17 to permit the engine (driving source) to start. If it is not determined in S4a that the authentication code is legitimate, the series of controls ends without performing S5a.

On the other hand, on the portable device 2 side, it is determined whether or not a preset regular access signal is received (S1b), and if it is determined that the regular access signal is received, the process proceeds to S2b, and the crime prevention mode is set. It is determined whether or not there is. In this case, since the crime prevention mode is not set, the authentication code (a preset authentic authentication code) is transmitted in S3b, and the engine start is permitted on the in-vehicle unit 1 side (S5a). ..

According to the first and second embodiments, a predetermined setting operation replaces the transmission of the authentication code by the portable device 2 or the transmission of the access signal by the vehicle-mounted unit 1 and transmits a camouflage signal different from the regular signal. Since the crime prevention mode can be set, it is possible to prevent the signal processing from becoming complicated and maintain the transmission and reception of signals to further improve the crime prevention effect. In particular, when setting the crime prevention mode, a random number code is generated and stored in the storage means (8, 15) of the vehicle-mounted unit 1 and the portable device 2, respectively, and when the release operation is performed, the storage device of the portable device 2 is generated. The random number code stored in 15 and the random number code stored in the storage unit 8 of the vehicle-mounted unit 1 are collated, and the crime prevention mode is released only when these random number codes match. Can be maintained.

Further, according to the first wireless communication system (control of FIG. 4) of the present embodiment, in the crime prevention mode, the camouflage signal is transmitted instead of the authentication code by the portable device 2, and the regular access signal by the vehicle-mounted unit 1 is transmitted. Is transmitted, the crime prevention mode can be set without changing the signal processing function of the vehicle-mounted unit 1 side. Further, according to the second wireless communication system (control of FIG. 5) of the present embodiment, in the crime prevention mode, the camouflage signal is transmitted instead of the access signal by the vehicle-mounted unit 1, and the regular authentication code by the portable device 2 is transmitted. Is transmitted, the security mode can be set without changing the signal processing function of the portable device 2 side. Furthermore, according to the third wireless communication system (control of FIG. 6) of the present embodiment, in the crime prevention mode, the camouflage signal is transmitted instead of both the authentication code by the portable device 2 and the access signal by the vehicle-mounted unit 1. Therefore, the crime prevention effect can be further enhanced as compared with the case where either the authentication code or the access signal is transmitted instead of the camouflage signal.

In addition, if the setting operation or the release operation of the crime prevention mode is performed by the operation button 2a (operation unit) included in the portable device 2, the driver carrying the portable device 2 can remotely set or release the crime prevention mode. The operability can be improved. On the other hand, if the setting operation or the release operation of the crime prevention mode is performed by the operation means included in the vehicle-mounted unit 1, the access button 1a (operation means) for transmitting the access signal is used for setting or canceling the crime prevention mode. It can be used as a means, and the device configuration can be simplified.

Further, if the storage means 8 and 15 is configured to record the reception of the camouflaged signal by the vehicle-mounted unit 1 or the portable device 2, it is possible to monitor the illegal action such as the relay attack based on the recording of the reception of the camouflaged signal. It is possible to further improve the crime prevention property. Furthermore, by providing an informing unit (LED 2b) for informing the reception of the camouflaged signal by the in-vehicle unit or the portable device, it is possible to easily and in real time grasp an illegal act such as a relay attack.

In addition, the vehicle-mounted unit 1 according to the present embodiment has an immobilizer function capable of transmitting a low frequency to the portable device 2 to generate electric power and wirelessly transmitting the authentication code with the electric power. It is possible to smoothly respond to an emergency such as when the battery runs out. In addition, the portable device 2 (which may be the vehicle-mounted unit 1) can be informed that the crime prevention mode is set by lighting or blinking the LED 2b. Therefore, when the passenger leaves the vehicle, the crime prevention mode is set. The setting status can be visually confirmed.

Although the present embodiment has been described above, the present invention is not limited to this. For example, a predetermined setting operation for setting a crime prevention mode or a crime prevention mode for a vehicle-side operation unit attached to a vehicle. Alternatively, a predetermined release operation for releasing may be possible. In this case, the operating means on the vehicle side may be the switch M1 or the switch M2 arranged in the handlebar switch case C attached to the handlebar H of the vehicle as shown in FIG. In addition, reference symbol G in the figure indicates a grip grip that can be gripped by the driver. Although FIG. 11 shows the handlebar switch case C attached to the left side of the handlebar H, the switch M1 or the switch M2 may be provided in the handlebar switch case attached to the right side of the handlebar H. ..

The switch M1 is composed of a cross key that can be pressed to the left and right and up and down. For example, a menu is displayed on a display means (a meter panel, a separate liquid crystal display means, etc.) included in the vehicle, and items related to the crime prevention mode are displayed from the menu. The crime prevention mode may be set or released by selecting and determining with the switch M1. Further, the switch M2 may be an operation button that can be pressed, and the security mode may be set or released by pressing the operation button.

In this way, when a predetermined setting operation for setting the crime prevention mode or a predetermined release operation for canceling the crime prevention mode is enabled for the vehicle-side operation means attached to the vehicle, the crime prevention mode is set. A predetermined setting operation or a predetermined release operation for releasing the crime prevention mode can be performed at an arbitrary position of the vehicle, and operability can be improved. In particular, since the vehicle-side operation means is provided in the handlebar switch case C attached to the handlebar H of the vehicle, a predetermined setting operation for setting the crime prevention mode or a predetermined release operation for canceling the crime prevention mode is performed. It is possible to further improve the sex.

In addition, for example, when the determination unit 4 determines that the authentication code is a legitimate authentication code, a permission signal is transmitted to the ECU 17 to permit the engine (driving source) of the vehicle to start, as in the present embodiment, and Instead of the lock bar L that allows the vehicle to travel with the unlock position, the lock bar L is exclusively used to transmit a permission signal to the ECU 17 to permit the engine (drive source) of the vehicle to be started, or the lock bar is exclusively used. The vehicle may be allowed to travel with L being the unlock position.

In addition, when the release operation is performed on the operation button 2a of the portable device 2, the crime prevention mode may be released, the turn signal of the vehicle may be blinked, and the answer callback may be activated. Further, it may not have an immobilizer function, or may have no notification means such as the LED 2b. Although the present embodiment is applied to a two-wheeled vehicle, it may be applied to other vehicles such as an ATV, a snowmobile, a construction machine or an agricultural machine, and even an automobile.

By a predetermined setting operation, if it is a wireless communication system capable of setting a crime prevention mode that transmits a camouflage signal different from a regular signal instead of transmitting an authentication code by a portable device or transmitting an access signal by an in-vehicle unit, The external shape may be different, or other functions may be added.

1 In-vehicle unit 1a Access button (operation means)
2 Portable device 2a Operation buttons (operation section)
2b LED (informing means)
3 Control means 4 Judging means 5 Setting means 6 Release means 7 Immobilization control means 8 Storage means 9 Battery 10 Power supply control driver 11 Motor driver 12 Low frequency driver 13 High frequency driver 14 Control means 15 Storage means 16 Position detection sensor 17 ECU
18 IPD (semiconductor device)
19 Selection means S Turn signal M Motor F1 Low frequency antenna F2 High frequency antenna G1 Low frequency antenna G2 High frequency antenna D Battery

Claims (8)

An in-vehicle unit that is mounted on a vehicle and has an operation unit that a passenger can arbitrarily operate, and that can wirelessly transmit an access signal by operating the operation unit;
A portable device capable of wirelessly transmitting a vehicle-specific authentication code on condition that the passenger is portable and has received the access signal.
On the condition that the authentication code has been received, a determination means capable of determining whether the authentication code is a regular authentication code,
In a wireless communication system that includes, and when the authentication code is determined by the determination means to be a legitimate authentication code, the drive source of the vehicle can be permitted to start or the vehicle can travel.
By a predetermined setting operation, it is possible to set a crime prevention mode in which a camouflage signal different from a regular signal is transmitted instead of transmitting the authentication code by the portable device or transmitting the access signal by the vehicle-mounted unit. Wireless communication system. The wireless communication system according to claim 1, wherein in the crime prevention mode, the camouflage signal is transmitted instead of the authentication code by the portable device, and the regular access signal by the vehicle-mounted unit is transmitted. The wireless communication system according to claim 1, wherein in the crime prevention mode, the camouflage signal is transmitted instead of the access signal by the vehicle-mounted unit, and the authorized authentication code is transmitted by the portable device. The wireless communication system according to claim 1, wherein in the crime prevention mode, the camouflage signal is transmitted instead of both the authentication code by the portable device and the access signal by the vehicle-mounted unit. The wireless communication system according to any one of claims 1 to 4, wherein the security mode setting operation or cancellation operation can be performed by an operation unit included in the portable device. The wireless communication system according to any one of claims 1 to 4, wherein the operation for setting or canceling the crime prevention mode can be performed by the operation unit included in the vehicle-mounted unit. 7. The wireless communication system according to claim 1, further comprising a storage unit capable of recording reception of the camouflaged signal by the vehicle-mounted unit or the portable device. The wireless communication system according to any one of claims 1 to 7, further comprising a notification unit that notifies reception of the camouflaged signal by the vehicle-mounted unit or the portable device.

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