JP6484412B2 - Vehicle communication system - Google Patents

Description

  The present invention relates to a vehicle communication system.

  2. Description of the Related Art Conventionally, a vehicle communication system that uses sound waves to determine a distance between a vehicle and a portable device and permits or executes an operation of the vehicle device according to the distance is known. In the vehicle communication system of Patent Document 1, the vehicle first transmits a radio wave, and transmits a sound wave after a predetermined time has elapsed since the transmission of the radio wave. The portable device measures the arrival time of sound waves from reception of radio waves to reception of sound waves, and wirelessly transmits this time to the vehicle. The vehicle calculates the distance between the vehicle and the portable device by multiplying the time obtained by subtracting the predetermined time from the sound wave arrival time by the speed of the sound wave. The vehicle starts the engine when it is determined from the calculated distance that the portable device is located in the passenger compartment, and locks and unlocks the door when the portable device is determined to be located outside the passenger compartment. Are allowed to switch.

JP2013-104247A

  If it is possible to specify which seat each of a plurality of passengers has boarded, for example, the air conditioning can be automatically adjusted according to the boarding position of each passenger to provide a comfortable riding environment for each passenger. . However, in the system of Patent Document 1, it is not possible to specify the position of the seat in which the passenger has boarded, even though it can be specified whether the plurality of passengers are located inside or outside the vehicle. Therefore, a comfortable boarding environment cannot be provided for each passenger. The boarding environment is not limited to air conditioning, but also includes a boarding environment provided by another vehicle such as a seat or audio.

  This invention is made | formed in view of such the actual condition, The objective is to provide the vehicle communication system which specifies a passenger's boarding position.

  In order to solve the above-described problem, a vehicle communication system including a first mobile terminal, a second mobile terminal, and a vehicle that perform wireless communication according to a specific communication standard includes the first mobile terminal and the second mobile terminal. Respectively, a terminal speaker that transmits sound waves, a microphone that receives sound waves, a terminal transmission unit that transmits radio waves, and a radio wave that includes information indicating that is triggered by the reception of the sound waves and transmits the sound waves A vehicle-mounted speaker for transmitting sound waves; a vehicle-mounted receiving unit for receiving radio waves; a time measuring unit for measuring time; and the first portable terminal after generating sound waves. And the distance between the vehicle-mounted speaker and the first portable terminal based on the time required to receive the radio wave from at least one of the second portable terminal and the vehicle Calculating at least one of a second car-terminal distance, which is a distance between the speaker and the second portable terminal, and receiving a radio wave from one of the first portable terminal and the second portable terminal; The distance between the first portable terminal and the second portable terminal is calculated based on the time required to receive the radio wave from the other terminal, and based on the calculated distance, the distance between the first portable terminal and the second portable terminal is calculated. And a vehicle-mounted control unit that specifies a boarding position of a user who possesses the first portable terminal and the second portable terminal.

  For example, a case where the first inter-terminal distance and inter-terminal distance can be calculated will be described. When the first car-terminal distance can be calculated, the boarding position of the user who has the first portable terminal can be estimated from the in-vehicle speaker as a seat at the first car-terminal distance. Furthermore, since the distance between terminals can be calculated, the boarding position of the user who possesses the second portable terminal can be estimated as a seat at the distance between the terminals from the first portable terminal. In a vehicle, seats that satisfy these conditions are limited. Therefore, according to this system, the boarding positions of each of the plurality of passengers can be specified.

  When the second car-terminal distance can be calculated in addition to the above two distances, the boarding position of the user carrying the second mobile terminal is the second car-terminal distance from the in-vehicle speaker. It can be estimated as a seat. Since the seat at the position satisfying the calculated three distances is further limited as compared with the seat at the position satisfying the two distances, the boarding positions of each of the plurality of passengers can be specified more accurately. .

In the above system, it is preferable that the in-vehicle speaker is provided at a position where the distance from each vehicle door is different.
According to this system, the seats at the positions satisfying the calculated two to three distances are limited as compared with the case where the in-vehicle speaker is provided at a position where the distance from each vehicle door is equal. Therefore, the boarding positions of each of the plurality of passengers can be specified more accurately.

  In the system, the vehicle includes an opening / closing detection unit that detects opening / closing of a vehicle door, and the in-vehicle control unit performs external communication with at least one of the first portable terminal and the second portable terminal. Accordingly, at least one of the first car-terminal distance and the second car-terminal distance is calculated, the inter-terminal distance is calculated, and the first portable terminal is calculated based on the calculated distance. The position of the vehicle door used when the user carrying the second mobile terminal gets into the vehicle is estimated, and the opening and closing of the vehicle door estimated here is detected, whereby the first mobile terminal and the second mobile terminal are detected. It is preferable to specify the boarding position of the user who owns the portable terminal.

  Since the interior of the vehicle is a closed space, the mobile terminal may receive the sound wave transmitted from the same speaker a plurality of times due to reflection of the sound wave. In this case, the mobile terminal transmits a radio wave as a response to the sound wave a plurality of times. This may make it difficult to specify the boarding position.

In this regard, according to this system, at least one of the first car-terminal distance and the second car-terminal distance, and the terminal-to-terminal distance are calculated by external communication. Since there is little possibility of sound waves being reflected outside the vehicle, the in-vehicle control unit can calculate at least one of the first car-terminal distance and the second car-terminal distance, and the terminal distance. And the position of the user who possesses the 1st portable terminal and the 2nd portable terminal outside a vehicle can be estimated from these calculated distances. Since the in-vehicle speaker is provided at a position where the distance from each vehicle door used when entering the vehicle is different, the vehicle door that needs to be opened and closed when the user at the previously estimated position gets into the vehicle is estimated. it can. Then, it is possible to identify the user of the boarding position with the opening and closing of the estimated vehicle door.

  In the system, the vehicle performs mutual wireless communication between the first portable terminal and the second portable terminal that have entered a first communication area set around the vehicle, When both the first portable terminal and the second portable terminal have entered the first communication area, the in-vehicle control unit is configured between the first portable terminal and the second portable terminal. The first portable terminal and the second portable terminal are requested to transmit and receive a sound wave from the vehicle and to receive a sound wave. It is preferable to start transmission / reception of sound waves between the terminals.

According to this system, the timing at which sound waves are transmitted from the speakers of the first portable terminal and the second portable terminal is at least a state in which the first portable terminal or the second portable terminal can perform mutual wireless communication with the vehicle. The in-vehicle receiver can receive the radio wave transmitted as a response of the sound wave picked up by the first portable terminal and the second portable terminal with the microphone. Therefore, the in-vehicle control unit can calculate the inter-terminal distance associated with the transmission / reception of sound waves between the terminals. In other words, the situation in which the distance between the terminals cannot be calculated by the transmission / reception of the sound wave between the terminals is suppressed, so that the situation in which the sound waves are transmitted from the first portable terminal and the second portable terminal is less. For this reason, the circumference | surroundings of a 1st portable terminal and a 2nd portable terminal are not noisy.

  In the system, the vehicle performs mutual wireless communication with a vehicle-dedicated electronic key that has entered a second communication area that is narrower than the first communication area set around the vehicle. The in-vehicle speaker transmits a sound wave to a region set to cover the second communication area, and the in-vehicle control unit is configured such that when the electronic key enters the second communication area, It is preferable that the first portable terminal and the second portable terminal are requested to transmit radio waves accompanying the reception of sound waves, and sound waves are transmitted from the in-vehicle speaker.

According to this system, the timing at which the sound wave is transmitted from the in-vehicle speaker is a state in which at least the user holding the electronic key is located in the second communication area, that is, a state in which the sound wave transmitted from the in-vehicle speaker can be received. . For this reason, if the user who has an electronic key has a portable terminal, the said portable terminal can receive a sound wave. Accordingly, the onboard control unit can exchange and radio wave transmission and reception of sound waves between the mobile terminal. Therefore, since the sound wave is prevented from being transmitted in vain, the surroundings of the vehicle are not noisy.

In the above system, it is preferable that a plurality of the in-vehicle speakers are provided at positions that are not symmetrical in front, rear, left, and right of the vehicle.
According to this system, since the in-vehicle control unit can acquire a plurality of first car-terminal distances and second car-terminal distances, the positions of the first mobile terminal and the second mobile terminal Can be estimated more accurately. Therefore, the boarding positions of each of the plurality of passengers can be specified more accurately.

  The vehicle communication system of the present invention can specify the boarding position of a passenger.

The block diagram which shows schematic structure of a vehicle control system. The schematic diagram of each communication area formed around a vehicle. The top view which shows the positional relationship of a vehicle (vehicle-mounted speaker) and a passenger. A time chart of sound waves and radio waves exchanged between the vehicle and each smartphone.

Hereinafter, an embodiment of a vehicle communication system will be described with reference to the drawings.
As shown in FIG. 1, the vehicle communication system 1 includes a wireless communication between the vehicle 10 and the first smartphone 30, a wireless communication between the vehicle 10 and the second smartphone 40, and the vehicle 10. Vehicle control is performed through wireless communication with the electronic key 20.

<Electronic key>
As shown in FIG. 1, the electronic key 20 can transmit the reception and UHF (Ultra Hi gh Frequency) band of the radio signal of LF (Low Frequency) band of the radio signal. The electronic key 20 stores an ID code common to the vehicle-mounted control unit 11 of the vehicle 10. The ID code is used for mutual authentication with the in-vehicle control unit 11.

  When the electronic key 20 receives a later-described request signal that is an LF-band radio signal, the electronic key 20 generates a response signal including an ID code as a response thereto. The response signal is modulated into a radio signal in the UHF band and transmitted by radio.

<Smartphone>
As shown in FIG. 1, the first smartphone 30 includes a smartphone control unit 31, a BT communication unit 32, a terminal speaker 33, a microphone 34, and a touch panel display 35. Each configuration excluding these smartphone control units 31 is electrically connected to the smartphone control unit 31 and is controlled by the smartphone control unit 31 in an integrated manner.

  The BT communication unit 32 is mounted on other devices by performing frequency hopping that randomly changes the frequency of the 2.4 GHz band (2.40 to 2.48 GHz) divided into 79 or 40 frequency channels. Bluetooth (registered trademark) communication (hereinafter referred to as BT communication) is performed with the BT communication unit. Here, the BT communication includes both a classic type using 79 ch and a low energy type using 40 ch. The BT communication unit 32 converts an electrical signal into a 2.4 GHz band radio signal and wirelessly transmits the radio signal toward a preset communication area through the BT antenna 32a. The BT communication unit 32 converts a 2.4 GHz band radio signal received through the BT antenna 32a into an electrical signal. The BT communication unit 32 corresponds to a terminal transmission unit.

  The terminal speaker 33 converts the sound wave generation signal generated by the smartphone control unit 31 into a sound wave, and transmits the converted sound wave to the periphery of the smartphone 30. The microphone 34 picks up sound waves and converts them into electrical signals. The touch panel display 35 converts information indicating the touch position into an electrical signal and displays an image based on the image signal generated by the smartphone control unit 31.

  The memory 31a of the smartphone control unit 31 stores a BT device address unique to itself. The BT device address is used for pairing processing and BT communication with a communication partner having a BT communication unit.

  The smartphone control unit 31 searches for a device capable of pairing, a BT communication enabled mode in which BT communication is enabled with a paired communication partner, a BT communication disabled mode in which BT communication is disabled And a search mode. Switching between these three modes is performed by operating the touch panel display 35.

  When the smartphone control unit 31 in the search mode finds a device that can be paired, it performs a pairing process. When the pairing process is completed, the smartphone control unit 31 can perform BT communication with the paired communication partner. The communication partner is specified by a device address unique to the communication partner. In order to ensure security, the pairing process may require the entry of a personal identification number unique to the communication partner. Once the personal identification number is entered, pairing can be performed without entering the personal identification number thereafter. Sometimes allowed. In some cases, pairing is permitted without entering a password once.

  Moreover, the smart phone control unit 31 in the BT communication enable mode further includes an inter-terminal acoustic wave transmission / reception mode and an inter-vehicle terminal acoustic wave transmission / reception mode. Switching between these two modes is performed by performing BT communication with the in-vehicle control unit 11. Specifically, when the smartphone control unit 31 receives an inter-terminal sound wave transmission / reception signal including information indicating that sound waves are transmitted / received between terminals from the in-vehicle control unit 11, the inter-terminal sound wave transmission / reception mode is set between the vehicle and the terminal. When the inter-vehicle terminal sound wave transmission / reception signal including information indicating that sound waves are transmitted / received is received, the mode is switched to the inter-vehicle terminal sound wave transmission / reception mode.

  Note that the inter-terminal sound wave exchange signal includes a first inter-terminal sound wave exchange signal that includes information indicating that a sound wave is transmitted first, and a second information that indicates that a sound wave is transmitted after the sound wave is received. There is an inter-terminal sound wave transmission / reception signal.

The smartphone control unit 31 that has received the first inter-terminal sound wave transfer signal shifts to the inter-terminal sound wave transfer mode. And the smart phone control part 31 produces | generates a sound wave production | generation signal while producing | generating the start signal containing the information which shows that transmission / reception of the sound wave between terminals is started. The start signal is wirelessly transmitted by the BT communication unit 32. The sound wave generation signal is converted into sound waves by the terminal speaker 33 and transmitted. Thereafter, the smartphone control unit 31 waits for reception of sound waves. The smartphone control unit 31 uses the reception of sound waves as a trigger, generates a reception signal including information indicating that, and then generates a sound wave generation signal.

  On the other hand, the smartphone control unit 31 that has received the second inter-terminal sound wave transfer signal shifts to the inter-terminal sound wave transfer mode. Then, the smartphone control unit 31 waits for reception of sound waves. The smartphone control unit 31 uses the reception of sound waves as a trigger, generates a reception signal including information indicating that, and then generates a sound wave generation signal.

  Moreover, the smart phone control part 31 which received the sound wave transmission / reception signal between vehicle terminals transfers to the sound wave transmission / reception mode between vehicle terminals. Then, the smartphone control unit 31 waits for reception of sound waves. The smartphone control unit 31 generates a reception signal including information indicating the reception of sound waves as a trigger. The smartphone control unit 31 corresponds to a terminal control unit.

  The second smartphone 40 includes a smartphone control unit 41, a BT communication unit 42, a terminal speaker 43, a microphone 44, and a touch panel display 45. The smartphone control unit 41 includes a memory 41a. Since the structure of the 2nd smart phone 40 is the same as that of the structure of the 1st smart phone 30, detailed description of each structure is abbreviate | omitted. The smartphone control unit 41 corresponds to a terminal control unit, and the BT communication unit 42 corresponds to a terminal transmission unit.

<Vehicle>
As shown in FIG. 1, the vehicle 10 includes an in-vehicle control unit 11, a BT communication unit 12, an LF transmission unit 13, a UHF reception unit 14, a door handle sensor 15, a door lock device 16, and a door courtesy 18. And a vehicle-mounted speaker 19. Of these components, the components other than the in-vehicle control unit 11 are electrically connected to the in-vehicle control unit 11 and are comprehensively controlled by the in-vehicle control unit 11.

  The BT communication unit 12 performs Bluetooth communication with other BT communication units by performing frequency hopping in the 2.4 GHz band. The BT communication unit 12 converts the electrical signal generated by the in-vehicle control unit 11 into a 2.4 GHz band signal. The converted wireless signal is wirelessly transmitted through the BT antenna 12a toward the BT communication area S1 set so as to cover the entire vehicle 10, as shown in FIG. Here, the BT communication area S1 is an area of about 30 m around the vehicle, but can be set to an area of about 10 to 100 m around the vehicle by adjusting the BT output. The BT communication unit 12 converts a 2.4 GHz band radio signal received through the BT antenna 12a into an electrical signal. The BT communication unit 12 corresponds to an in-vehicle receiving unit.

  The LF transmitter 13 modulates an electric signal into a radio signal in an LF (Low Frequency) band. The modulated radio signal is wirelessly transmitted toward the LF communication area S2 set so as to cover the area near the vehicle door as shown in FIG. Here, although the LF communication area S2 is an area of about 1 m near the vehicle door, it can be set to an area of about several meters near the door on the driver's seat side by adjusting the shape and output of the antenna. is there.

UHF receiver 14, which receives the radio signals of UHF (Ultra Hi gh Frequency) band, demodulates the received signal into an electrical signal.
The door handle sensor 15 detects contact with the door handle, and the door lock device 16 switches between locking and unlocking the door.

  The door courtesy 18 is a courtesy switch that detects opening and closing of the vehicle door. Here, the door courtesy FR18a that detects the opening and closing of the front right door, the door courtesy FL18b that detects the opening and closing of the front left door, the door courtesy RR18c that detects the opening and closing of the rear right door, and the door courtesy that detects the opening and closing of the rear left door. RL18d is provided. The door courtesy 18 corresponds to the opening / closing detection unit.

  The in-vehicle speaker 19 includes a first speaker 19a provided on the A pillar on the right side of the vehicle and a second speaker 19b provided on the C pillar on the left side of the vehicle as shown in FIG. The vehicle-mounted speaker 19 converts an electrical signal into a sound wave. The converted sound wave is transmitted from each of the speakers 19a and 19b, and reaches a region having a radius of about 5 m centered on each speaker. In addition, although illustration is abbreviate | omitted, the area | region where the sound wave transmitted from speaker 19a, 19b reaches | attains is an area | region which covers the vehicle 10 whole including LF communication area S2.

  The memory 11 a of the in-vehicle control unit 11 stores a Bluetooth device address and a personal identification number unique to itself, and an ID code common to the electronic key 20. The Bluetooth device address and password are used for pairing processing with a communication partner having a BT communication unit. The ID code is used for mutual authentication with the electronic key 20. The memory 11a stores distance calculation formulas for calculating the distance between the car and the terminal and between the terminals.

Moreover, the vehicle-mounted control part 11 is provided with the counter 11b which measures time. Vehicle control unit 11 uses the counter 11b, the time and from the reception of wave reception signal to the reception of the wave reception signal, generate a wave generation signal by itself until it receives the wave reception signal Each time is measured. The counter 11b corresponds to a time measuring unit.

  The in-vehicle control unit 11 has a BT communication enable mode in which BT communication is possible with a paired communication partner, and a BT communication disable mode in which BT communication is disabled. Switching between the BT communication enabled mode and the BT communication disabled mode is performed by operating an input device (not shown).

  Note that the in-vehicle control unit 11 in the BT communication enable mode is in a state that can be paired with a device having the BT communication unit, and is paired with the device by being discovered by the searching device and subjected to pairing processing. The When the pairing process is completed, the in-vehicle control unit 11 can perform BT communication with the paired communication partner. The communication partner is specified by a code unique to the communication partner. In addition, the vehicle-mounted control part 11 calculates | requires the input of a PIN code in the case of a pairing process. When a personal identification number is input to itself, pairing with a device having the personal identification number is permitted.

  In addition, the vehicle-mounted control part 11 produces | generates the request signal which requests | requires transmission of ID code regularly irrespective of a mode. The request signal is wirelessly transmitted toward the LF communication area S2. When receiving the response signal including the ID code as a response to the request signal, the in-vehicle control unit 11 collates the ID code included in the response signal. When the verification is established, the in-vehicle control unit 11 permits switching between locking and unlocking the door. When contact with the door handle sensor 15 is detected in this state, the vehicle-mounted control unit 11 switches between locking and unlocking the door through the door lock device 16.

  In the BT communication enabled mode, the in-vehicle control unit 11 paired between the two smartphone control units 31 and 41 transmits a first inter-terminal sound wave transmission / reception signal to one of the paired smartphone control units, A second inter-terminal sound wave transmission / reception signal is generated for the other, and these are wirelessly transmitted. In addition, here, the vehicle-mounted control unit 11 transmits the first inter-terminal sound wave transmission / reception signal to the previously paired smartphone control unit, and the second inter-terminal sound wave to the smartphone control unit paired later. Each exchange signal is generated.

After transmission of the first terminal between the acoustic transfer signal and the second terminal between acoustic transfer signal, the onboard control unit 11 measures a time from reception of wave reception signal until it receives the next wave reception signal. And the distance between terminals which is the distance between two smart phones is calculated from the time.

Moreover, the vehicle-mounted control part 11 produces | generates the sound transmission / reception signal between vehicle terminals with respect to the two smart phone control parts 31 and 41, when collation of ID code is materialized.
Thereafter, the vehicle-mounted control unit 11 measures the time from when the sound wave generation signal is generated to when the sound wave reception signal is received. And the 2nd vehicle-terminal which is the distance between the 1st car-terminal distance which is the distance between the vehicle 10 and the 1st smart phone 30 from that time, and the distance between the vehicle 10 and the 2nd smart phone 40 At least one of the distances is calculated.

  The in-vehicle control unit 11 estimates a passenger's boarding position from at least one of the first car-terminal distance, the second car-terminal distance, and the terminal distance. Then, the boarding position of the passenger is specified by opening and closing the door corresponding to the boarding position estimated through the door courtesy 18. The vehicle-mounted control unit 11 operates a vehicle such as an air conditioner according to the specified boarding position.

The memory 11a of the in-vehicle control unit 11 performs processing from when the smartphone control units 31 and 41 in the inter-terminal sound wave transmission / reception mode receive a sound wave to when a sound wave generation signal is generated using the reception of the sound wave as a trigger. Such time (hereinafter referred to as “smartphone processing time Td”) is stored in advance. The memory 11a stores a maximum time for stopping the calculation of the distance between the car and the terminal. The in-vehicle controller 11 terminates the calculation of the distance between the car and the terminal when the maximum time has elapsed since the generation of the sound wave for calculating the distance between the car and the terminal. This maximum time is set based on a range in which a sound wave transmitted from the vehicle-mounted speaker 19 reaches.

<Action>
Next, the operation of the vehicle communication system 1 will be described according to the time chart shown in FIG. Here, three passengers, passenger A who has the electronic key 20, passenger B who has the first smartphone 30, and passenger C who has the second smartphone 40, try to get into the vehicle 10 A description will be given assuming the case of approaching.

  When the passengers B and C enter the BT communication area S1 (see FIG. 2), as shown in FIG. 4, the in-vehicle control unit 11 starts communication with the smartphone control unit 31 and communicates with the smartphone control unit 41. Communication is started (timing T1). It is assumed that the passengers B and C are paired in advance between the smartphones 30 and 40 and the vehicle 10. Thereafter, the in-vehicle control unit 11 periodically performs BT communication with the smartphone control unit 31 and with the smartphone control unit 41, respectively. The in-vehicle control unit 11 is a smartphone control unit that is connected first through BT communication that is periodically performed, here, the first inter-terminal sound wave transmission / reception signal to the smartphone control unit 31, and the smartphone that is connected later. A second inter-terminal sound wave transmission / reception signal is wirelessly transmitted to the control unit, here the smartphone control unit 41.

The smartphone control unit 31 that has received the first inter-terminal sound wave transmission / reception signal generates a start signal, generates a sound wave generation signal, and transmits a sound wave (timing T2). Vehicle control unit 11, through the reception of the start signal, recognizes that the smartphone controller 31 sends sound waves.

  The smartphone control unit 41 that has received the sound wave generates a reception signal (timing T3). And the smart phone control part 41 produces | generates a sound wave generation signal, and transmits a sound wave after progress of the smart phone processing time Td from reception of a sound wave (timing T4). The in-vehicle control unit 11 recognizes that the smartphone control unit 41 has received the sound wave through reception of the reception signal.

  The smartphone control unit 31 that has received the sound wave generates a reception signal (timing T5). And the smart phone control part 31 produces | generates a sound wave generation signal, and transmits a sound wave after progress of the smart phone processing time Td from reception of a sound wave (timing T6). The in-vehicle control unit 11 recognizes that the smartphone control unit 31 has received the sound wave through reception of the reception signal.

  Thereafter, the processes at timings T3 to T6 are repeated. The in-vehicle control unit 11 measures a time Ta between a timing T3 (T5) and a timing T5 (T3) for receiving a reception signal wirelessly transmitted from each of the smartphone control units 31 and 41 through the counter 11b. The time obtained by subtracting the smartphone processing time Td from the time Ta is the time required for the sound wave to travel between the first smartphone 30 and the second smartphone 40. Therefore, by multiplying this time by the speed of sound, the in-vehicle control unit 11 calculates a distance (distance between terminals) between the first smartphone 30 and the second smartphone 40. The in-vehicle control unit 11 determines whether the first smartphone 30 and the second smartphone 40 are carried by different passengers based on the calculated inter-terminal distance. When it is determined that the first smartphone 30 and the second smartphone 40 are carried by different passengers, the processing after the next timing T11 is performed.

  When it is determined that the first smartphone 30 and the second smartphone 40 are carried by different passengers, the in-vehicle control unit 11 triggers entry of the user who possesses the electronic key 20 into the LF communication area S2. As a result, the inter-vehicle terminal sound wave transmission / reception signal is transmitted wirelessly (timing T11). Thereby, the smart phone control parts 31 and 41 switch from the sound wave transmission / reception mode between terminals to the sound wave transmission / reception mode between vehicle terminals. Then, the vehicle-mounted control part 11 produces | generates a sound wave production | generation signal, and transmits a sound wave (timing T12).

The smartphone control units 31 and 41 that have received the sound waves generate reception signals, respectively (timing T13 and T14).
The in-vehicle control unit 11 recognizes that the smartphone control units 31 and 41 have received sound waves through reception of the reception signal. The vehicle-mounted control unit 11 generates a sound wave through the counter 11b and then receives a wirelessly transmitted reception signal from each of the smartphone control units 31 and 41, that is, between the timing T12 and the timing T13, and A time Tb and a time Tc between the timing T12 and the timing T14 are measured. The time Tb is required for the sound wave to travel between the vehicle 10 (the vehicle-mounted speaker 19) and the first smartphone 30, and the time Tc is required for the sound wave to travel between the vehicle 10 (the vehicle-mounted speaker 19) and the second smartphone 40. Time. Therefore, by multiplying this time by the speed of sound, the in-vehicle control unit 11 causes the distance between the vehicle 10 (the in-vehicle speaker 19) and the first smartphone 30 (the first inter-terminal distance), the vehicle 10 ( The distance between the in-vehicle speaker 19) and the second smartphone 40 (second car-terminal distance) is calculated.

Then, the vehicle-mounted control part 11 produces | generates the 1st and 2nd inter-terminal sound wave transmission / reception signal (timing T15). Thereby, the smart phone control units 31 and 41 are switched from the inter-vehicle terminal sound wave transmission / reception mode to the inter-terminal sound wave transmission / reception mode. Thereafter, the processing of the timing T2～T 5 are repeated.

  In addition, for example, when the distance from the vehicle-mounted speaker 19 to the smartphone is far and the smartphone cannot receive sound waves, the vehicle-mounted control unit 11 generates a sound wave generation signal and when the maximum time has passed, The calculation of the distance between the car and the terminal is terminated, and the process at timing T15 is performed.

  The in-vehicle control unit 11 determines the passengers B carrying the first smartphone 30 and the second smartphone 40 from the calculated first car-terminal distance, second car-terminal distance, and terminal distance. The boarding position of C is estimated.

(When the first car-terminal distance, the second car-terminal distance, and the terminal distance can all be calculated)
As shown in FIG. 3, the first car-to-terminal distance r4, the second car-to-terminal distance r5, and the terminal-to-terminal distance r6 can be calculated using the second speaker 19b as a reference point for calculation. The case will be described. In this case, the vehicle-mounted control unit 11 can estimate that the passenger C is located at a position where the RL door can be opened and closed, and the passenger B is located at a position where the RL door cannot be opened and closed and the FL door may be opened and closed. That is, if the RL door is opened and closed, it is due to the passenger C, and if the FL door is opened and closed, it can be specified as being due to the passenger B. The in-vehicle control unit 11 specifies the boarding positions of the passengers B and C by detecting the opening / closing by the door courtesy 18.

  In addition to the above three distances, if the first car-terminal distance r2 and the second car-terminal distance r3 using the first speaker 19a as a reference point for calculation can be calculated, the accuracy can be increased. The positions of passengers B and C can be estimated. Therefore, the specification accuracy of the boarding positions of the passengers B and C is high.

(When one of the first car-terminal distance and the second car-terminal distance and the terminal distance can be calculated)
As shown in FIG. 3, a case will be described where the second car-to-terminal distance r5 and the terminal-to-terminal distance r6 are calculated using the second speaker 19b as a reference point for calculation. In this case, the vehicle-mounted control unit 11 is in a position where the passenger C cannot open and close the FL door and can open and close the RL door, and the passenger B cannot open and close the RL door and can open and close the FL door. It can be estimated that each is located. Even in this case, if the RL door is opened and closed, it is due to the passenger C, and if the FL door is opened and closed, it can be specified as being due to the passenger B.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) The smart phone control units 31 and 41 are configured to transmit a sound wave while receiving a reception signal including information indicating that the reception of the sound wave is a trigger. Moreover, the vehicle-mounted control part 11 was made to calculate the distance between terminals through reception of the received signal based on the sound wave transmitted / received between the smart phone control parts 31 and 41. Further, the in-vehicle control unit 11 calculates at least one of the first car-terminal distance and the second car-terminal distance through reception of a reception signal based on a sound wave transmitted by itself.

  For example, a case where the first inter-terminal distance and inter-terminal distance can be calculated will be described. When the first car-terminal distance can be calculated, the boarding position of the user carrying the smartphone 30 can be estimated from the in-vehicle speaker 19 as a seat at the first car-terminal distance. Furthermore, since the distance between terminals can be calculated, the boarding position of the user who has the smartphone 40 can be estimated from the smartphone 30 as a seat at the distance between terminals. In a vehicle, seats that satisfy these conditions are limited. Therefore, according to this system, the boarding positions of each of the plurality of passengers can be specified.

  (2) In addition to the above two distances, when the second car-terminal distance can also be calculated, the boarding position of the user carrying the smartphone 40 is changed from the in-vehicle speaker 19 to the second car-terminal distance. It can be estimated that there is a seat. Since the seat at the position satisfying the calculated three distances is further limited as compared with the seat at the position satisfying the two distances, the boarding positions of each of the plurality of passengers can be specified more accurately. .

  (3) The 1st speaker 19a and the 2nd speaker 19b which comprise the vehicle-mounted speaker 19 were provided in the position where the distance from each vehicle door differs. Thereby, since the seat in the position which satisfies the 2 thru | or 3 distance which the vehicle-mounted control part 11 calculated is limited, the boarding position of each of several passengers can be pinpointed more correctly.

(4) A door courtesy 18 for detecting opening and closing of the vehicle door is provided. The in-vehicle control unit 11 calculates at least one of the first car-to-terminal distance and the second car-to-terminal distance by performing external communication with the smartphones 30 and 40, and calculates the inter-terminal distance. Based on these calculated distances, the position of the vehicle door used when the passenger carrying the smartphones 30 and 40 gets into the vehicle 10 is estimated. Then, the onboard control unit 11, the opening and closing of the estimated vehicle door Ri by to be detected through the door courtesy 18, and to identify the boarding position of the passenger carrying the smart phone 30, 40.

  Since the interior of the vehicle is a closed space, the smartphones 30 and 40 may receive the sound waves transmitted from the same speaker a plurality of times due to reflection of sound waves. In this case, the smartphones 30 and 40 transmit a radio wave (reception signal) as a response to the sound wave a plurality of times. This may make it difficult to specify the boarding position.

In that respect, since there is little possibility of sound waves being reflected outside the vehicle, the in-vehicle control unit 11 calculates at least one of the first car-terminal distance and the second car-terminal distance, and the terminal distance. Can do. And the position of the passenger who has the smart phones 30 and 40 outside a vehicle can be estimated from these calculated distances. Since the in-vehicle speaker 19 is provided at a position where the distance from each vehicle door used when entering the vehicle is different, a vehicle door that needs to be opened and closed when the passenger at the previously estimated position gets into the vehicle. Can be estimated. Then, it is possible to identify the passenger boarding position with the opening and closing of the estimated vehicle door.

(5) When the smartphone 30, 40 enters the BT communication area S1 formed around the vehicle 10, the in-vehicle control unit 11 transmits and receives sound waves between the smartphones 30, 40 and reception of sound waves. An inter-terminal sound wave transmission / reception signal requesting transmission is transmitted. Thereby, the timing at which sound waves are transmitted from the smartphones 30 and 40 is a state in which at least the vehicle-mounted control unit 11 can perform BT communication with the smartphone control units 31 and 41. This state is a state in which the in-vehicle control unit 11 can calculate the inter-terminal distance associated with the exchange of sound waves between the smartphones 30 and 40. In other words, situations that can not be calculated inter-terminal distance Professor receive the sound waves between the smartphone 30, 40 is suppressed. For this reason, the circumference | surroundings of the smart phones 30 and 40 are not noisy.

  (6) The first and second speakers 19a and 19b constituting the in-vehicle speaker 19 are provided on the vehicle right side A pillar and the vehicle left side C pillar, which are positions that are not symmetrical in front, rear, left, and right of the vehicle. Thereby, since the vehicle-mounted control part 11 can acquire two or more 1st car-terminal distance and 2nd car-terminal distance, it can estimate the position of the smart phones 30 and 40 more correctly. . Therefore, the boarding positions of each of the plurality of passengers can be specified more accurately.

  (7) The region where the sound wave transmitted from the vehicle-mounted speaker 19 reaches is set so as to cover the LF communication area S2. And the vehicle-mounted control part 11 requests | requires transmission of the electromagnetic wave accompanying reception of a sound wave with respect to the smart phones 30 and 40, when the electronic key 20 approachs LF communication area S2 formed around the vehicle 10 An inter-sonic wave transmission / reception signal is generated and a sound wave is transmitted from the vehicle-mounted speaker 19. Thereby, the smart phones 30 and 40 can receive the sound wave from the vehicle-mounted speaker 19, and the vehicle-mounted control part 11 is a state which can receive a received signal from the smart phone control parts 31 and 41. FIG. Therefore, the vehicle-mounted control unit 11 is in a state where the vehicle-terminal distance can be calculated. In other words, the situation where the distance between the car and the terminal cannot be calculated is suppressed. For this reason, the periphery of the vehicle 10 is not noisy.

In addition, you may change the said embodiment as follows.
In the above embodiment, the in-vehicle speaker 19 only needs to include either the first speaker 19a or the second speaker 19b. Even if comprised in this way, the vehicle-mounted control part 11 can pinpoint a passenger's boarding position from the position of the smart phones 30 and 40. FIG.

  -There may be three or more in-vehicle speakers 19. If there are three or more, the in-vehicle control unit 11 can more accurately identify the boarding position of the passenger from the positions of the smartphones 30 and 40.

  In the above embodiment, a system in which the vehicle-mounted control unit 11 transmits sound waves regardless of the position of the electronic key 20 may be used. In addition, the smartphone control units 31 and 41 may be systems that transmit sound waves regardless of the position with respect to the vehicle 10.

  -In above-mentioned embodiment, you may set BT communication area S1 and LF communication area S2 to arbitrary widths. Moreover, the area where the sound wave transmitted from the vehicle-mounted speaker 19 reaches may be set to an arbitrary size.

  -In the said embodiment, it is better to set the frequency of the sound wave transmitted from the vehicle-mounted speaker 19 and the terminal speakers 33 and 43 to a different specific frequency. If comprised in this way, the vehicle-mounted control part 11 and the smart phone control parts 31 and 41 can specify the transmission source of the sound wave from the frequency of the sound wave to receive. And if it comprises so that a reception signal may be produced | generated only with respect to the sound wave from the transmission source set beforehand, consumption of the battery in the smart phones 30 and 40 can also be suppressed.

  -In the said embodiment, a sound wave may not be a single frequency of 20 kHz, for example. For example, frequency modulation using different frequencies in a specific range such as 18 to 20 kHz may be used. Further, amplitude modulation may be performed.

  -In above-mentioned embodiment, you may adjust each speaker 19,33,43 so that the sound wave matched with the frequency with which the microphone employ | adopted for the smart phones 30 and 40 is easy to pick up beforehand is transmitted. If comprised in this way, the operation | movement reliability of the vehicle communication system 1 will increase.

  In the above embodiment, the sound wave transmitted from each speaker 19, 33, 43 is a high-frequency sound wave, but it is easy for humans to hear, in other words, a sound wave having a frequency that is easy for humans to emit, specifically, in the audible region. A sound wave having a frequency of 1 kHz to 20 kHz may be used. If it is a microphone employ | adopted as the normal smart phone 30 and 40, since the sound wave of the frequency which a person emits can be picked up without a problem, the sound wave transmitted from each speaker 19, 33, 43 can also be picked up without a problem.

In the above embodiment, the smartphones 30 and 40 may also function as the electronic key 20.
In the above embodiment, the case where Bluetooth is adopted as a communication standard between the vehicle 10 and the smartphones 30 and 40 has been described, but other communication standards may be used.

  In the above-described embodiment, the smartphones 30 and 40 are employed as the mobile terminals, but instead of this, a tablet terminal that does not have a telephone function, a portable music terminal, a notebook personal computer, or the like may be used.

  -In the said embodiment, you may perform the search of the other party and the pairing process which can be paired from the vehicle-mounted control part 11. FIG.

DESCRIPTION OF SYMBOLS 1 ... Vehicle communication system, 10 ... Vehicle, 11 ... Vehicle-mounted control part, 11a ... Memory, 11b ... Counter, 12 ... BT communication part, 13 ... LF transmission part, 14 ... UHF reception part, 15 ... Door handle sensor, 16 ... Door lock device, 18 ... Door courtesy, 19 ... In-vehicle speaker, 19a ... First speaker, 19b ... Second speaker, 20 ... Electronic key, 30, 40 ... Smartphone, 31, 41 ... Smartphone controller, 32, 42 ... BT communication unit, 33, 43 ... terminal speaker, 34, 44 ... microphone, 35, 45 ... touch panel display.

Claims (6)

In a vehicle communication system comprising a first portable terminal and a second portable terminal that perform wireless communication according to a specific communication standard, and a vehicle,
Wherein the first mobile terminal, a first terminal speaker for transmitting sound waves, a first microphone for receiving sound waves, a first terminal communication unit that communicates by radio with the vehicle, the first When the terminal communication unit receives a sound wave transmission / reception signal between the vehicle terminals, the first terminal communication unit transmits a signal including information indicating the reception of sound waves from the first microphone as a trigger. When the first terminal communication unit receives the first inter-terminal sound wave transmission / reception signal, the first terminal communication unit transmits a signal including information indicating that the sound wave transmission / reception between the terminals is started. And transmitting a sound wave from the first terminal speaker , and then receiving a signal containing information indicating that triggered by reception of the sound wave from the second portable terminal by the first microphone . the Ru is transmitted from the terminal communication unit Comprising of a terminal control portion,
The second portable terminal includes: a second terminal speaker that transmits sound waves; a second microphone that receives sound waves; a second terminal communication unit that performs radio wave communication with the vehicle; and When the terminal communication unit receives a sound wave transmission / reception signal between the vehicle terminals, the second terminal communication unit transmits a signal including information indicating that triggered by reception of a sound wave by the second microphone. When the second terminal communication unit receives a second inter-terminal sound wave transmission / reception signal, information indicating that is triggered by reception of sound waves from the first portable terminal by the second microphone. A second terminal control unit that transmits the transmitted signal from the second terminal communication unit and transmits a sound wave from the second terminal speaker,
The vehicle includes an in-vehicle speaker that transmits sound waves, an in- vehicle communication unit that performs radio wave communication between the first mobile terminal and the second mobile terminal, a time measurement unit that measures time, and the in- vehicle after transmitting the wave transmission and reception signal between said vehicle terminal to the communication unit, the vehicle communication unit were allowed to transmit sound waves to the vehicle speaker signals from at least one of the first mobile terminal and the second mobile terminal Based on the time required for reception, the distance between the in-vehicle speaker and the first portable terminal and the distance between the in-vehicle speaker and the second portable terminal, which is the distance between the in-vehicle speaker and the first portable terminal. After calculating at least one of a certain second car-terminal distance and causing the in- vehicle communication unit to transmit the first inter-terminal acoustic wave transmission / reception signal and the second inter-terminal acoustic wave transmission / reception signal , Mobile terminal and second mobile The signal from one terminal of the first mobile terminal and the second mobile terminal based on the time required to receive said vehicle communication unit a signal from the other from receiving said vehicle communication unit A vehicle communication system comprising: an in-vehicle control unit that calculates an inter-terminal distance, which is a distance between the terminals, and identifies a boarding position of a user who possesses the first mobile terminal and the second mobile terminal based on the calculated distance . The vehicle communication system according to claim 1,
The vehicle-mounted speaker is a vehicle communication system provided at a position where the distance from each vehicle door is different. The vehicle communication system according to claim 2,
The vehicle includes an opening / closing detection unit that detects opening / closing of a vehicle door,
The in-vehicle control unit performs communication outside the vehicle with at least one of the first mobile terminal and the second mobile terminal, so that the distance between the first car and the terminal and between the second car and the terminal Calculating at least one of the distances, calculating the distance between the terminals, and a vehicle door used when a user having the first portable terminal and the second portable terminal gets into the vehicle based on the calculated distance A vehicle communication system that estimates a position and identifies a boarding position of a user who possesses the first portable terminal and the second portable terminal by detecting opening and closing of the estimated vehicle door. The vehicle communication system according to claim 3,
The vehicle performs mutual wireless communication between the first portable terminal and the second portable terminal that have entered a first communication area set around the vehicle,
The in-vehicle control unit, when both of the first mobile terminal and the second mobile terminal has entered the first communication area, relative to the these the first mobile terminal the second mobile terminal vehicle communication system Ru is transmitted each said first terminal between the acoustic transfer signal and the second terminal between acoustic transfer signal from the vehicle-mounted communication unit Te.
The vehicle communication system according to claim 4,
The vehicle performs mutual wireless communication with a vehicle-dedicated electronic key that has entered a second communication area that is narrower than the first communication area set around the vehicle,
The vehicle-mounted speaker transmits sound waves to a region set to cover the second communication area,
The in-vehicle control unit, when the electronic key has entered into the second communication area, requests transmission of radio waves with respect to the previous SL first mobile terminal and the second mobile terminal to the reception of sound waves A vehicle communication system that transmits sound waves from the in-vehicle speaker. In the vehicle communication system according to any one of claims 2 to 5,
The vehicle-mounted speaker is a vehicle communication system in which a plurality of the vehicle-mounted speakers are provided at positions that are not symmetrical in front, rear, left, and right of the vehicle.