JP2021145228A - Vehicle control device, portable device, vehicle control system, and control method - Google Patents

Abstract

To improve crime prevention of a saddle-mounted vehicle that can be wirelessly operated.SOLUTION: In a vehicle control system 100, a vehicle control device 1 includes: a communication unit 11 that receives a first signal and a second signal; an intensity detection unit 12 that detects the reception intensity of the first signal and the second signal; an output difference value acquisition unit 13 that acquires an output difference value; an authentication determination unit 14 that determines that the authentication of the first signal has been successfully performed when a difference between a value indicating the degree of a difference in reception strength between the first signal and the second signal and the output difference value is equal to or less than a predetermined threshold value, and determines that the authentication of the first signal has been failed when the difference is larger than the predetermined threshold value; and a control execution unit 15 that controls a saddle-type vehicle according to a control instruction when it is determined that the authentication of the first signal has been successfully performed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle control device, a portable device, a vehicle control system, and a control method.

In recent years, a keyless unlocking system called a smart entry system or a smart key system has been adopted in saddle-mounted vehicles. In these systems, instead of a physical key and cylinder, a portable device that emits a radio signal and an in-vehicle device that receives and authenticates the radio signal are used to unlock or lock.

For example, in the unlocking system, the portable device transmits a wireless signal in response to a user operation or the like. The receiver mounted on the saddle-type vehicle receives the radio signal. Then, the receiver or another in-vehicle device or the like authenticates the data included in the received wireless signal. If the certification is successful, the saddle-mounted vehicle will be unlocked or locked.

JP-A-2018-566658 Japanese Unexamined Patent Publication No. 2016-21970 Japanese Unexamined Patent Publication No. 2019-60196

In this way, when the saddle-mounted vehicle is operated keylessly using the wireless signal, there is a problem that the saddle-mounted vehicle can be illegally operated (particularly, unlocking operation) by using the illegally acquired wireless signal. was there.

For example, roll jam and relay attack are examples of unauthorized operation of saddle-type vehicles. The roll jam is a method of illegally operating a saddle-type vehicle by illegally acquiring a radio wave transmitted from a user's portable device with a dedicated device and then retransmitting the illegally acquired wireless signal. Further, the relay attack is a method of transmitting radio waves transmitted from a portable device to a terminal existing at a distant place by using a repeater or the like, and illegally operating a saddle-type vehicle from the terminal. For example, Patent Document 1 discloses a technique for preventing a relay attack by transmitting a plurality of signals with different output intensities from the portable device.

One aspect of the present invention is to enhance the crime prevention of a saddle-type vehicle capable of wireless operation.

In order to solve the above problems, the vehicle control device according to one aspect of the present invention is a vehicle control device mounted on a saddle-type vehicle, and includes a control instruction from a portable device to the saddle-type vehicle. A receiving unit that receives the first signal, a signal that is continuously output after the first signal, and a second signal that is a signal having a different output intensity from the first signal, and the first signal. Output difference, which is a value that defines the degree of difference in output intensity between the first signal and the second signal included in the first signal and the detection unit that detects the reception intensity of the second signal. When the difference between the acquisition unit for acquiring the value, the value indicating the degree of difference in reception intensity between the first signal and the second signal, and the output difference value is equal to or less than a predetermined threshold value, the first The authentication determination unit that determines that the signal authentication has been successful, and if it is larger than the predetermined threshold value, determines that the authentication of the first signal has failed, and the control if the authentication of the first signal is successful. A control execution unit that controls the saddle-mounted vehicle according to an instruction is provided.

The magnitude relationship of the output strength of the signal transmitted from the portable device matches the magnitude relationship of the reception strength of the signal in the vehicle control device. Therefore, according to the above configuration, it is possible to specify whether or not the first signal and the second signal are transmitted in a magnitude relationship of the output intensities determined in advance by the output difference value. Then, it can be determined that the authentication of the first signal is successful by allowing the deviation within the range of the predetermined threshold value from the value determined by the output difference value. Therefore, according to the above configuration, it is possible to improve the crime prevention property of a saddle-type vehicle capable of wireless operation while allowing an error in strength due to a communication environment or the like.

In the vehicle control device, the output difference value may be a value that defines the difference in output intensity between the first signal and the second signal, and the authentication determination unit may use the first signal and the second signal. When the difference between the absolute value of the difference in reception strength from the signal and the output difference value is equal to or less than the first threshold value, it is determined that the authentication is successful, and the first signal and the second signal are used. When the difference between the absolute value of the difference in reception strength and the output difference value is larger than the first threshold value, it may be determined that the authentication has failed.

According to the above configuration, it is possible to specify whether or not the first signal and the second signal are transmitted with the output intensities determined in advance by the output difference value. Then, from the value determined by the output difference value, if the deviation is within the range of the first threshold value, it is allowed, and it can be determined that the authentication of the first signal is successful. Therefore, according to the above configuration, it is possible to improve the crime prevention property of a saddle-type vehicle capable of wireless operation while allowing an error in strength due to a communication environment or the like.

In the vehicle control device, the output difference value may be a value that defines the ratio of the output intensity of the second signal to the output intensity of the first signal, and the authentication determination unit receives the first signal. When the difference between the ratio of the reception strength of the second signal to the strength and the output difference value is equal to or less than the second threshold value, it is determined that the authentication is successful, and the second signal is received with respect to the strength of the first signal. When the difference between the ratio of the reception strength of the signal and the output difference value is larger than the second threshold value, it may be determined that the authentication has failed.

According to the above configuration, it is possible to specify whether or not the first signal and the second signal are transmitted with the output intensities determined in advance by the output difference value. Then, from the value determined by the output difference value, if the deviation is within the range of the second threshold value, it is allowed, and it can be determined that the authentication of the first signal is successful. Therefore, according to the above configuration, it is possible to improve the crime prevention property of a saddle-type vehicle capable of wireless operation while allowing an error in strength due to a communication environment or the like.

In the vehicle control device, the first signal may consist of a first preamble and a data portion including the control instruction and the output difference value, and the second signal may consist of a second preamble.

According to the above configuration, since the first signal and the second signal have different preambles, the reception intensity can be detected by distinguishing each signal.

In the vehicle control device, the output difference value may be a value that is changed at irregular timings.

The first signal and the second signal are output with the degree of difference indicated by the output difference value, respectively. Therefore, when the output difference value changes at an irregular timing, the output intensities of the first signal and the second signal also change irregularly. Therefore, when an attempt is made to illegally operate a saddle-mounted vehicle by a method such as roll jam or relay attack, it is possible to make it more difficult to reproduce the setting of the output intensities of the first signal and the second signal. Therefore, the crime prevention property of the saddle-mounted vehicle capable of wireless operation can be further improved.

In the vehicle control device, the first signal is strong signal information indicating a signal having a higher output intensity among the first signal and the second signal continuously output after the first signal. The authentication determination unit may include the difference between the value indicating the degree of difference in reception strength between the first signal and the second signal and the output difference value being equal to or less than a predetermined threshold value. When the signal having the higher reception strength among the first signal and the second signal is the signal indicated by the strong signal information, it may be determined that the authentication is successful.

The magnitude relationship of the output strength of the signal transmitted from the portable device matches the magnitude relationship of the reception strength of the signal in the vehicle control device. Therefore, according to the above configuration, when attempting to illegally operate a saddle-type vehicle by roll jam or relay attack, the saddle-type vehicle must reproduce the strength and magnitude relationship of each of the first signal and the second signal. The vehicle cannot be operated illegally. Therefore, according to the above configuration, the crime prevention property of the saddle-mounted vehicle capable of wireless operation can be further enhanced.

In order to solve the above problems, the portable device according to one aspect of the present invention is a portable device that communicates with the vehicle control device, and has an output difference value determining unit that determines the output difference value and the output difference. A signal generation unit that generates the first signal including a value, the second signal, a signal output unit that continuously outputs the first signal and the second signal with different output intensities, and the like. To be equipped. According to the above configuration, the same effect as that of the vehicle control device is obtained.

In order to solve the above problems, the vehicle control system according to one aspect of the present invention is a vehicle control device and a portable device that communicates with the vehicle control device, and is an output difference value that determines the output difference value. The determination unit, the signal generation unit that generates the first signal including the output difference value, the second signal, the first signal, and the second signal are continuously produced with different output intensities. Includes a signal output unit for output, and a portable device including. According to the above configuration, the same effect as that of the vehicle control device is obtained.

In order to solve the above problems, the control method according to one aspect of the present invention is a control method of a vehicle control device mounted on a saddle-type vehicle, and is a control instruction from a portable device to the saddle-type vehicle. A reception step for receiving a first signal including the first signal and a second signal which is a signal continuously output after the first signal and is a signal having a different output intensity from the first signal, and the first signal. It is a value that defines the degree of difference in output intensity between the first signal and the second signal included in the first signal and the detection step for detecting the reception intensity of each of the first signal and the second signal. When the difference between the acquisition step for acquiring the output difference value, the value indicating the degree of difference in reception intensity between the first signal and the second signal, and the output difference value is equal to or less than a predetermined threshold value, the said When it is determined that the authentication of the first signal is successful and the value is larger than the predetermined threshold value, the authentication determination step of determining that the authentication of the first signal has failed, and when the authentication of the first signal is successful, A control execution step of controlling the saddle-type vehicle according to the control instruction is included. According to the above configuration, the same effect as that of the vehicle control device is obtained.

According to one aspect of the present invention, it is possible to enhance the crime prevention property of a saddle-type vehicle capable of wireless operation.

It is a block diagram which shows an example of the main part structure of the vehicle control system which concerns on Embodiment 1 of this invention. It is a figure which shows the type and structure of the radio signal transmitted from a portable device. It is a sequence diagram which shows an example of the processing flow in the said vehicle control system.

[Embodiment 1]
≪Main part composition≫
FIG. 1 is a block diagram showing an example of a main configuration of the vehicle control system 100 according to the present embodiment. The vehicle control system 100 includes a vehicle control device 1 and a portable device 2. Further, the vehicle control device 1 is an in-vehicle device mounted on a saddle-mounted vehicle 9 provided with various parts 3.

(Vehicle control device 1)
The vehicle control device 1 is a device that receives a wireless signal transmitted by the portable device 2 and authenticates the data included in the wireless signal. If the authentication is successful, the vehicle control device 1 controls various parts 3 of the saddle-mounted vehicle 9 according to the contents of the data. In the present embodiment, as shown in FIG. 1, the vehicle control device 1 is mounted on the saddle-mounted vehicle 9.

(Portable device 2)
The portable device 2 is a device for transmitting a wireless signal. The specific structure of the portable device 2 is not particularly limited. For example, the portable device 2 may be a dedicated device for transmitting a control instruction to the saddle-mounted vehicle 9, or may be realized by a terminal device owned by a user such as a smartphone.

The portable device 2 outputs two types of wireless signals, a first signal and a second signal. The first signal is a signal including control instructions for various parts 3 of the saddle-mounted vehicle 9. The second signal is a signal that is continuously output after the second signal, and is a signal having an output intensity different from that of the first signal.

The process that triggers the output of these wireless signals from the portable device 2 is not particularly limited. In the present embodiment, when the user executes a predetermined operation on the portable device 2, a wireless signal is transmitted from the portable device 2.

(1st signal and 2nd signal)
FIG. 2 is a diagram showing a type and structure of a wireless signal transmitted from the portable device 2. The arrows in the figure indicate the passage of time. As shown in the figure, the portable device 2 transmits the first signal and then continuously transmits the second signal. The radio frequencies of the first signal and the second signal are not particularly limited. For example, the first signal and the second signal may be output in UHF (ultra high frequency). The first signal and the second signal are transmitted with different output intensities. The difference in output intensity between the first signal and the second signal is defined by the output difference value. The output difference value will be described in detail later.

The first signal consists of at least a first preamble and a data portion. The first preamble is a portion of the first signal that indicates preamble information. The data part is a part of the first signal showing actual data. The data portion includes at least a control instruction for various parts 3 of the saddle-mounted vehicle 9 and an output difference value.

The second signal consists of at least a second preamble. The second preamble is a part showing information on the preamble of the second signal. The first signal and the second signal may include information other than the information shown in FIG. For example, the second signal may include data other than the preamble.

As described above, since the first signal and the second signal have different preambles, the reception strength can be detected by distinguishing each signal.

(Detailed configuration of portable device 2)
The portable device 2 includes an input unit 21, a control unit 20, a portable device communication unit (signal output unit) 24, and a storage unit 25. The input unit 21 is an input interface that accepts user input. The input unit 21 is realized by, for example, a button provided on the portable device 2. When the input unit 21 detects a predetermined input operation (for example, pressing a button) of the user, the input unit 21 notifies the control unit 20 of the content of the input operation.

The storage unit 25 is a storage device that stores various data necessary for the operation of the portable device 2. The storage unit 25 may store, for example, data for the control unit 20 to generate the first signal and the second signal. More specifically, the storage unit 25 may store the data of the first preamble and the second preamble, and the data indicating the control instruction to be included in the data portion of the first signal. Further, the storage unit 25 may store a mathematical formula for calculating the output difference value or a data table that defines the output difference value, which is used when determining the output difference value.

The control unit 20 comprehensively controls the portable device 2. The control unit 20 includes a signal generation unit 22 and an output difference value determination unit 23.

The signal generation unit 22 generates a first signal and a second signal. The signal generation unit 22 generates the first signal and the second signal, for example, when the control unit 20 is notified of the content of the input operation from the input unit 21 as a trigger. The signal generation unit 22 outputs the generated first signal and second signal to the portable device communication unit 24.

The order of generation of the first signal and the second signal and the generation method are not particularly limited. In the present embodiment, as an example, the signal generation unit 22 generates the first signal, then generates the second signal, and sequentially outputs these to the portable device communication unit 24.

When the signal generation unit 22 generates the first signal, the signal generation unit 22 requests the output difference value determination unit 23 for the output difference value. When the output difference value is acquired from the output difference value determining unit 23 in response to the request, the signal generation unit 22 creates a data portion including information indicating the acquired output difference value. The signal generation unit 22 generates the first signal by adding the first preamble to the created data portion. Further, the signal generation unit 22 determines the second preamble and generates the second signal. The signal generation unit 22 outputs the generated first signal and second signal to the portable device communication unit 24.

The signal generation unit 22 may generate the first preamble using a specified mathematical formula or the like, or may read out and use the first preamble stored in the storage unit 25 in advance. Similarly, the signal generation unit 22 may generate the second preamble, or the second preamble may be read from the storage unit 25 and used.

The output difference value determination unit 23 determines the output difference value. The "output difference value" is a value that defines the degree of difference in output intensity between the first signal and the second signal that is continuously output after the first signal. The output difference value determination unit 23 outputs an output difference value to the signal generation unit 22 in response to a request from the signal generation unit 22.

For example, the output difference value may be a value that defines the difference in output intensity between the first signal and the second signal. Further, for example, the output difference value may be a value that defines the ratio of the output intensity of the second signal to the output intensity of the first signal.

The specific numerical value and the method of determining the output difference value in the output difference value determining unit 23 are not particularly limited. For example, the specific value of the output difference value may be appropriately determined according to the specifications of the vehicle control system 100, the performance of the antenna of the portable device 2 or the portable device communication unit 24, and the like.

For example, in the vehicle control system 100, it is assumed that the distance range in which the saddle-mounted vehicle 9 can be wirelessly operated by the portable device 2 is defined in advance. In this case, the first signal and the second signal are set within a range of output intensity such that the portable device 2 and the saddle-type vehicle 9 reach the saddle-type vehicle 9 when they are within the distance range. Is desirable.

Further, the output difference value may be a value that is changed at irregular timings. For example, the output difference value is a value that changes in real time, which is obtained by substituting the time measured by the time measuring unit (not shown) of the portable device 2 into the mathematical formula stored in the storage unit 25. You may. Further, the output difference value may be a value randomly determined within a predetermined value range each time the signal generation unit 22 requests the value.

The first signal and the second signal are output with the degree of difference indicated by the output difference value, respectively. Therefore, when the output difference value changes at an irregular timing, the output intensities of the first signal and the second signal also change irregularly. Therefore, when the saddle-mounted vehicle 9 is illegally operated by a method such as roll jam, it is possible to make it more difficult to reproduce the setting of the output intensities of the first signal and the second signal. Therefore, the crime prevention property of the saddle-mounted vehicle 9 capable of wireless operation can be further improved.

Further, for example, when a data table of output difference values is stored in the storage unit 25, the output difference value determination unit 23 may determine the output difference value using the data table. For example, when the signal generation unit 22 requests the output difference value, the output difference value determination unit 23 refers to any record in the data table and reads out the output difference value stored in the record. You may use it.

The portable device communication unit 24 outputs (transmits) a first signal and a second signal using the antenna of the portable device 2. When the first signal and the second signal are input from the signal generation unit 22, the portable device communication unit 24 first outputs the first signal, and then outputs the second signal without delay. Here, the portable device communication unit 24 changes the output intensities of the first signal and the second signal so as to cause a difference in the output indicated by the output difference value stored in the data portion of the first signal. Output the signal of.

For example, when the output difference value is a value that defines the difference in output intensity between the first signal and the second signal, the portable device communication unit 24 outputs the first signal and then the output intensity indicated by the output difference value. The output intensity is adjusted so that the difference between the two is output.

Further, for example, when the output difference value is a value indicating the ratio of the output intensity of the second signal to the output intensity of the first signal, the portable device communication unit 24 outputs the first signal and then the output difference value indicates. The second signal is output by adjusting the output intensity so that there is a difference in the output intensity in proportion. In this way, the first signal and the second signal that is continuously output after the first signal are output with the degree of difference defined by the output difference value.

As long as the relationship between the output intensities of the first signal and the second signal satisfies the relationship defined by the output difference value, the specific output intensity values of the first signal and the second signal are not particularly limited.

For example, the portable device communication unit 24 may determine the specific output intensities of the first signal and the second signal according to the performance of the antenna of the portable device 2 and the like. Further, the portable device communication unit 24 may have a configuration in which, for example, the output strength of the first signal is fixed and the output strength of the second signal is changed according to the output difference value. Alternatively, the portable device communication unit 24 may have a configuration in which the output strength of the second signal is fixed and the output strength of the first signal is changed according to the output difference value.

(Detailed configuration of vehicle control device 1)
The vehicle control device 1 includes a communication unit (reception unit) 11, a strength detection unit (detection unit) 12, an output difference value acquisition unit (acquisition unit) 13, an authentication determination unit 14, and a control execution unit 15. include.

The communication unit 11 receives the first signal and the second signal transmitted by the portable device 2. As described above, the portable device 2 first transmits the first signal, and then the second signal is transmitted. Therefore, the communication unit 11 receives the first signal first, and then continuously receives the second signal after the first signal. The communication unit 11 outputs the received first signal to the output difference value acquisition unit 13.

The intensity detection unit 12 monitors the reception of the first signal and the second signal in the communication unit 11. When the communication unit 11 receives the first signal and the second signal, the intensity detection unit 12 detects the reception intensity of these signals, respectively. The method for detecting the reception strength is not particularly limited. The strength detection unit 12 outputs the reception strength of the first signal and the reception strength of the second signal to the authentication determination unit 14, respectively.

The output difference value acquisition unit 13 acquires the output difference value from the first signal received by the communication unit 11. The output difference value acquisition unit 13 outputs the acquired output difference value to the authentication determination unit 14.

The authentication determination unit 14 authenticates the first signal based on the reception strength of the first signal, the reception strength of the second signal continuously received after the first signal, and the output difference value. For example, the authentication determination unit 14 determines whether or not the difference between the reception strength of the first signal and the reception strength of the second signal and the output difference value is equal to or less than a predetermined threshold value. Then, if it is equal to or less than a predetermined threshold value, the authentication determination unit 14 determines that the authentication of the first signal is successful, and if it is larger than the predetermined threshold value, the authentication determination unit 14 determines that the authentication of the first signal has failed. do.

More specifically, for example, when the output difference value is a value that defines the difference in output intensity between the first signal and the second signal, the authentication determination unit 14 first determines the difference between the first signal and the second signal. Calculate the absolute value of the difference in reception intensity. Then, it is determined whether or not the difference between the absolute value and the output difference value is equal to or less than the first threshold value. Then, when the difference between the absolute value and the output difference value is equal to or less than the first threshold value, it is determined that the authentication is successful, and when it is larger than the first threshold value, it is determined that the authentication is unsuccessful.

That is, when the reception strength of the first signal is RSSI1, the reception strength of the second signal is RSSI2, the output difference value is X, and the first threshold value is N, the authentication determination unit 14 authenticates when the following equation 1 is satisfied. Judge as successful.

(Equation 1) | RSSI1-RSSI2 | -X≥N
Further, for example, when the output difference value is a value that defines the ratio of the output strength of the second signal to the output strength of the first signal, the authentication determination unit 14 determines the reception strength of the second signal with respect to the reception strength of the first signal. It is determined whether or not the difference between the ratio of and the output difference value is equal to or less than the second threshold value. Then, when the difference between the ratio and the output difference value is equal to or less than the second threshold value, it is determined that the authentication is successful, and when it is larger than the second threshold value, it is determined that the authentication is unsuccessful.

That is, when the reception strength of the first signal is RSSI1, the reception strength of the second signal is RSSI2, the output difference value is Y, and the second threshold value is M, the authentication determination unit 14 authenticates when the following equation 2 is satisfied. Judge as successful.

(Equation 2) RSSI2 / RSSI1-X ≧ M
The magnitude relationship of the output intensities of the plurality of signals transmitted from the same portable device 2 coincides with the magnitude relationship of the reception intensities of the plurality of signals in the vehicle control device 1. That is, the difference and ratio of the output intensities of a certain first signal and the second signal output immediately after the first signal are substantially the same as the difference and ratio of the reception intensities of the first signal and the second signal.

Therefore, it can be said that the first threshold value N in Equation 1 is a buffer value that defines an allowable range of deviation between the difference in reception intensity between the first signal and the second signal and the difference defined by the output difference value. Similarly, it can be said that the second threshold value M in Equation 2 is also a buffer value that defines an allowable range of deviation between the ratio of the reception intensity of the second signal to the first signal and the ratio specified by the output difference value. The specific numerical values of the first threshold value and the second threshold value are not particularly limited. For example, these threshold values are appropriately determined according to, for example, the assumed communication distance between the portable device 2 and the vehicle control device 1, the communication method, and the like.

When it is determined that the authentication is successful, the authentication determination unit 14 outputs the control instruction included in the first signal to the control execution unit 15. On the other hand, if it is determined that the authentication has failed, the control instruction is not output and the process ends.

The control execution unit 15 controls various parts 3 of the saddle-mounted vehicle 9 according to the input control instruction. For example, the control execution unit 15 unlocks or locks the saddle-mounted vehicle 9 by operating a mechanism for unlocking and locking the saddle-mounted vehicle 9.

(Various parts 3)
The various parts 3 are parts or functional units of the saddle-mounted vehicle 9. The various parts 3 operate according to the control from the vehicle control device 1 (control execution unit 15 described later). In the present embodiment, as an example, the various parts 3 are mechanisms for unlocking and locking the saddle-mounted vehicle 9.

≪Processing flow≫
FIG. 3 is a sequence diagram showing an example of the processing flow of the vehicle control system 100 according to the present embodiment. In the illustrated example, the output difference value is a value indicating the absolute value of the difference between the reception strength of the first signal and the reception strength of the second signal.

When the user performs a predetermined operation such as pressing a button on the portable device 2, the input unit 21 accepts the operation (S101). The input unit 21 outputs the content of the input operation to the control unit 20.

When the signal generation unit 22 of the control unit 20 is notified of the content of the input operation, the signal generation unit 22 requests the output difference value determination unit 23 for the output difference value. The output difference value determination unit 23 determines the output difference value in response to the request and outputs the output difference value to the signal generation unit 22 (S102).

When the signal generation unit 22 acquires the output difference value, it creates a first signal and a second signal including a data portion including the output difference value (S103). The signal generation unit 22 outputs the created first signal and second signal to the portable device communication unit 24. The portable device communication unit 24 outputs the first signal and the second signal, respectively, with a difference in output intensity as specified by the output difference value (S104 and S105).

The communication unit 11 of the vehicle control device 1 receives the first signal (S106). At this time, the intensity detection unit 12 detects the reception intensity (RSSI1) of the first signal (S107). Further, the communication unit 11 continuously receives the second signal after the first signal (S108). At this time, the intensity detection unit 12 detects the reception intensity (RSSI2) of the second signal (S109).

The output difference value determination unit 23 outputs the received strength of the detected first signal and second signal to the authentication determination unit 14. Further, the communication unit 11 outputs the first signal to the output difference value acquisition unit 13. The output difference value acquisition unit 13 acquires the output difference value (X) from the data portion of the first signal (S110). The output difference value acquisition unit 13 outputs the output difference value to the authentication determination unit 14.

The authentication determination unit 14 determines whether or not the difference between the absolute value of the difference between the reception strength of the first signal and the reception strength of the second signal and the output difference value is equal to or less than the first threshold value N ( S111). When it is equal to or less than the first threshold value (YES in S111), the authentication determination unit 14 determines that the authentication is successful (S112), and outputs the control instruction included in the first signal to the control execution unit 15. The control execution unit 15 executes control of various components 3 according to the control instruction (S113).

On the other hand, when the difference between the absolute value of the difference between the reception strength of the first signal and the reception strength of the second signal and the output difference value is larger than the first threshold value N (NO in S111), the authentication determination unit 14 authenticates. (S114), and the process is terminated.

The magnitude relationship of the output intensity of the signal transmitted from the portable device 2 coincides with the magnitude relationship of the reception intensity of the signal in the vehicle control device 1. Therefore, according to the above processing, it is possible to specify whether or not the first signal and the second signal are transmitted in a magnitude relationship of the output intensities determined in advance by the output difference value.

Then, it can be determined that the authentication of the first signal is successful by allowing the deviation within the range of the predetermined threshold value from the value determined by the output difference value. Therefore, according to the above configuration, it is possible to improve the crime prevention property of a saddle-type vehicle capable of wireless operation while allowing an error in strength due to a communication environment or the like.

The vehicle control system 100 according to the present embodiment can prevent unauthorized operation of the saddle-mounted vehicle 9 due to roll jam. In the roll jam method, a third party who attempts to illegally operate the saddle-mounted vehicle 9 uses the terminal device of the third party to transmit radio waves (that is, the first signal and the second signal) transmitted from the portable device 2. It is illegally acquired and these signals are transmitted to the vehicle control device 1.

However, in the roll jam, the saddle-mounted vehicle 9 is illegally operated unless the output intensities of the first signal and the second signal when first output from the portable device 2 are reproduced in the terminal device of the third party. Can't. In the terminal device used for the roll jam, the output intensity cannot be adjusted according to the output difference value, and as a result, the saddle-mounted vehicle 9 cannot be operated.

[Embodiment 2]
The first signal may include a first signal and strong signal information indicating a signal (strong signal) having a higher output strength among the second signals continuously transmitted from the first signal. Then, the authentication determination unit 14 may determine that the authentication is successful when the following conditions (1) and (2) are satisfied.

(1) The difference between the value indicating the degree of difference in reception intensity between the first signal and the second signal and the output difference value is equal to or less than a predetermined threshold value. (2) Reception of the first signal and the second signal The signal having the higher intensity is the signal indicated by the strong signal information. Hereinafter, the second embodiment of the present invention will be described. For convenience of explanation, the members having the same functions as the members described in the above-described embodiment are designated by the same reference numerals, and the description thereof will not be repeated. The same applies to the subsequent embodiments.

The signal generation unit 22 of the portable device 2 according to the present embodiment includes strong signal information in either the first preamble or the data portion when generating the first signal. The strong signal information is information that defines which of the first signal and the second signal that is continuously output immediately after the first signal has the higher output intensity.

The strong signal information may be invariant or variable. Further, in the case of variable, the timing of changing the strong signal information is not particularly limited. For example, when the strong signal information is invariant, the strong signal information may be stored in the storage unit 25. Further, for example, which of the first signal and the second signal is to be a strong signal may be determined based on the time at the time of signal generation in the signal generation unit 22. Further, the signal generation unit 22 may define a signal opposite to the signal which is the strong signal in the set of the first signal and the second signal transmitted last time at the time of generating the first signal as a strong signal.

The magnitude relationship of the output intensities of the plurality of signals transmitted from the same portable device 2 coincides with the magnitude relationship of the reception intensities of the plurality of signals in the vehicle control device 1. Therefore, according to the above configuration, the degree of difference in the reception intensities of the first signal and the second signal is within the range defined by the threshold value from the output difference value, and the reception intensities of the first signal and the second signal are received. If the magnitude relation of is the same as the magnitude relation indicated by the strong signal information, it is determined that the authentication is successful.

Therefore, even if an attempt is made to illegally operate the saddle-mounted vehicle 9 by an illegal means such as a roll jam, the output difference between the illegally acquired first signal and the second signal is reproduced together with the output difference value, and eventually. The saddle-mounted vehicle 9 cannot be operated illegally unless the signal of is reproduced as a strong signal. Therefore, according to the above configuration, it is possible to realize a vehicle control system having higher security.

[Embodiment 3]
In the first and second embodiments, the first signal and the second signal are output from the portable device 2 when an event that becomes a transmission trigger occurs in the portable device 2, such as a user operation on the input unit 21.

However, the portable device 2 and the vehicle control device 1 may be configured to perform mutual authentication before starting the output of the signal related to the actual authentication, for example, when the communication standard of Bluetooth (registered trademark) is adopted. .. Then, when the mutual authentication is successful, the portable device 2 may transmit the first signal and the second signal.

In this case, the portable device 2 and the vehicle control device 1 store each other's identification information in advance. The portable device communication unit 24 of the portable device 2 transmits an authentication request signal to the vehicle control device 1 when an event that triggers transmission occurs. The authentication request signal includes identification information of the portable device 2.

When the communication unit 11 of the vehicle control device 1 receives the authentication request signal, it acquires the identification information of the portable device 2 included in the signal and determines whether or not the portable device 2 is associated with the own device. do. In the case of the portable device 2 associated with the own device, the vehicle control device 1 transmits a signal indicating mutual authentication OK to the portable device 2. As a result, the portable device 2 and the vehicle control device 1 are in a state of mutual authentication. Upon mutual authentication, the signal generation unit 22 of the portable device 2 creates a first signal and a second signal including the output difference value determined by the output difference value determination unit 23, and sets the portable device communication unit 24. These signals are transmitted with different output intensities.

The portable device communication unit 24 may constantly transmit an authentication request signal in order to mutually authenticate with the vehicle control device 1 existing in the vicinity. Then, when an event that becomes a transmission trigger occurs in the portable device 2 after the mutual authentication is successful, the first signal and the second signal may be transmitted.

In this way, in the case of accepting the wireless operation from the portable device 2 after performing mutual authentication, by adopting the configuration described in the first and second embodiments, the saddle-mounted vehicle 9 can be illegally operated by a so-called relay attack. Can be prevented.

When using the relay attack method, a third party who is not the user acquires the first signal and the second signal and sends these signals to another terminal device via the relay. Then, by transmitting the first signal and the second signal from the terminal toward the saddle-type vehicle 9, an unauthorized operation of the saddle-type vehicle 9 is attempted.

However, in this method, the saddle-type vehicle 9 cannot be tampered with unless the output intensities of the first signal and the second signal when first output from the portable device 2 are reproduced in the terminal device. In the terminal device used for the relay attack, the output intensity cannot be adjusted according to the output difference value, and as a result, the saddle-mounted vehicle 9 cannot be operated.

[Modification example]
The vehicle control system 100 according to the present invention may be applied to a four-wheeled vehicle such as an automobile instead of the saddle-mounted vehicle 9. In this case, the various parts 3 may be, for example, a mechanism for unlocking or locking the door of an automobile.

[Example of realization by software]
The control block of the vehicle control device 1 and the portable device 2 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be realized by software.

In the latter case, the vehicle control device 1 and the portable device 2 include a computer that executes instructions of a program that is software that realizes each function. The computer includes, for example, one or more processors and a computer-readable recording medium that stores the program. Then, in the computer, the processor reads the program from the recording medium and executes it, thereby achieving the object of the present invention. As the processor, for example, a CPU (Central Processing Unit) can be used. As the recording medium, a "non-temporary tangible medium", for example, a ROM (Read Only Memory) or the like, a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. Further, a RAM (Random Access Memory) for expanding the above program may be further provided. Further, the program may be supplied to the computer via an arbitrary transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program. It should be noted that one aspect of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the above program is embodied by electronic transmission.

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

1 Vehicle control device 2 Portable device 3 Various parts 9 Saddle-type vehicle 11 Communication unit 12 Strength detection unit 13 Output difference value acquisition unit 14 Authentication judgment unit 15 Control execution unit 20 Control unit 21 Input unit 22 Signal generation unit 23 Output difference value Decision unit 24 Portable device communication unit 25 Storage unit 100 Vehicle control system

Claims (9)

A vehicle control device mounted on a saddle-mounted vehicle.
A first signal including a control instruction for the saddle-type vehicle and a second signal continuously output after the first signal from the portable device, which are different in output intensity from the first signal. The signal, the receiver that receives, and
A detection unit that detects the reception strength of the first signal and the second signal, respectively.
An acquisition unit that acquires an output difference value, which is a value that defines the degree of difference in output intensity between the first signal and the second signal, which is included in the first signal.
When the difference between the value indicating the degree of difference in reception intensity between the first signal and the second signal and the output difference value is equal to or less than a predetermined threshold value, it is determined that the authentication of the first signal is successful. If it is larger than the predetermined threshold value, the authentication determination unit for determining that the authentication of the first signal has failed, and the authentication determination unit.
A vehicle control device including a control execution unit that controls the saddle-mounted vehicle in accordance with the control instruction when the authentication of the first signal is successful. The output difference value is a value that defines the difference in output intensity between the first signal and the second signal.
The authentication determination unit
When the difference between the absolute value of the difference in reception intensity between the first signal and the second signal and the output difference value is equal to or less than the first threshold value, it is determined that the authentication is successful.
When the difference between the absolute value of the difference in reception strength between the first signal and the second signal and the output difference value is larger than the first threshold value, it is determined that the authentication has failed. , The vehicle control device according to claim 1. The output difference value is a value that defines the ratio of the output intensity of the second signal to the output intensity of the first signal.
The authentication determination unit
When the difference between the ratio of the reception strength of the second signal to the reception strength of the first signal and the output difference value is equal to or less than the second threshold value, it is determined that the authentication is successful.
The claim is characterized in that when the difference between the ratio of the reception strength of the second signal to the reception strength of the first signal and the output difference value is larger than the second threshold value, it is determined that the authentication has failed. Item 1. The vehicle control device according to item 1. The first signal is composed of a first preamble and a data portion including the control instruction and the output difference value, and the second signal is composed of a second preamble, according to claims 1 to 3. The vehicle control device according to any one item. The vehicle control device according to any one of claims 1 to 4, wherein the output difference value is a value that is changed at an irregular timing. The first signal includes strong signal information indicating a signal having a higher output intensity among the first signal and the second signal continuously output after the first signal.
The authentication determination unit
The difference between the value indicating the degree of difference in reception intensity between the first signal and the second signal and the output difference value is equal to or less than a predetermined threshold value, and
1. The first signal and the second signal, whichever has a higher reception strength, is a signal indicated by the strong signal information, and is characterized in that the authentication is determined to be successful. 5. The vehicle control device according to any one of 5. A portable device that communicates with the vehicle control device according to any one of claims 1 to 6.
An output difference value determining unit that determines the output difference value,
A signal generation unit that generates the first signal including the output difference value and the second signal,
A portable device including a signal output unit that continuously outputs the first signal and the second signal with different output intensities. The vehicle control device according to any one of claims 1 to 6.
A portable device that communicates with the vehicle control device.
An output difference value determining unit that determines the output difference value,
A signal generation unit that generates the first signal including the output difference value and the second signal,
A portable device including a signal output unit that continuously outputs the first signal and the second signal with different output intensities.
A vehicle control system characterized by including. It is a control method of the vehicle control device mounted on the saddle-type vehicle.
A first signal including a control instruction for the saddle-type vehicle and a second signal continuously output after the first signal from the portable device, which are different in output intensity from the first signal. The signal, the receiving step to receive, and
A detection step for detecting the reception intensities of the first signal and the second signal, respectively.
An acquisition step for acquiring an output difference value, which is a value that defines the degree of difference in output intensity between the first signal and the second signal, which is included in the first signal.
When the difference between the value indicating the degree of difference in reception intensity between the first signal and the second signal and the output difference value is equal to or less than a predetermined threshold value, it is determined that the authentication of the first signal is successful. If it is larger than the predetermined threshold value, the authentication determination step of determining that the authentication of the first signal has failed, and the authentication determination step.
A control method comprising: a control execution step of controlling the saddle-type vehicle according to the control instruction when the authentication of the first signal is successful.

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