JP2019073960A - Vehicle position determination system - Google Patents

Abstract

To provide a position determination system for a vehicle capable of reducing the possibility of erroneous determination of the position of a portable terminal.SOLUTION: The on-vehicle system includes an external communication device 12 for performing wireless communication (that is, short distance communication) directly with a portable terminal 90 located outside the vehicle and the portable terminal, and an in-vehicle communication device 13 for near field communication with portable terminal 90 and portable terminal existing in the vehicle compartment. The outdoor communication device 12 is disposed in the middle of the surface of a metal B pillar 24B facing the outdoor. an in-vehicle communication device 13 is disposed near the center console. When the strength outside the vehicle is higher than the strength inside the vehicle, the position determination unit determines that the portable terminal is present outside the vehicle.SELECTED DRAWING: Figure 6

Description

  The present disclosure is a system mounted and used in a vehicle, wherein the position of the portable terminal is received by receiving a radio signal transmitted from a portable terminal carried by a user using radio waves of a predetermined frequency band. The present invention relates to a vehicle position determination system for estimation.

  Patent Document 1 discloses an on-vehicle apparatus having a function as a position determination system for a vehicle that estimates the position of the portable terminal with respect to the vehicle by performing wireless communication with the portable terminal carried by the user of the vehicle. There is. Specifically, when the portable terminal disclosed in Patent Document 1 receives a request signal requesting return of a response signal from a vehicle, the portable terminal returns a response signal including the Received Signal Strength Indication (RSSI) of the request signal. The on-vehicle apparatus stores the RSSI included in the response signal returned from the portable terminal in the memory. Then, the in-vehicle device determines that the portable terminal is present in the vehicle compartment when the average value of the latest five RSSIs stored in the memory exceeds a predetermined threshold. On the other hand, when the average value of the latest five RSSIs is equal to or less than the threshold value, it is determined that the vehicle is outside the vehicle.

  In addition, the above-mentioned portable terminal is a communication terminal provided with the communication function by Bluetooth (trademark), and in patent document 1, a smart phone, a mobile telephone, etc. are assumed as a portable terminal. Along with this, the in-vehicle device implements wireless communication compliant with Bluetooth (registered trademark). For convenience, in the following, communication conforming to a predetermined wireless communication standard such as Bluetooth and having a communication range of, for example, about several tens of meters will be referred to as short distance communication.

JP, 2015-214316, A

  The inventors tested the relationship between the reception intensity of the signal transmitted from the portable terminal in the on-vehicle apparatus and the position of the portable terminal in the configuration in which the antenna for short distance communication is disposed in the vehicle compartment. Findings like were obtained.

  When the portable terminal exists outside the vehicle, it is true that the reception intensity (hereinafter referred to as the vehicle interior strength) at the vehicle interior antenna becomes relatively low in many areas outside the vehicle exterior. However, even when the portable terminal is present outside the vehicle, when the portable terminal is present in the vicinity of the window of the vehicle, the signal from the portable terminal can easily enter the vehicle interior through the window and the vehicle interior The strength also tends to be relatively high. In addition, even when the portable terminal is present in the vehicle compartment, a plurality of radio waves generated by multipath act to weaken each other, and the strength of the vehicle compartment arranges the portable terminal in another area of the vehicle interior There may be a place (hereinafter referred to as a drop point) that falls relatively much more than in the case of

  In the configuration disclosed in Patent Document 1, if the threshold value for determining that the portable terminal is present in the vehicle compartment (hereinafter referred to as the determination threshold) is a sufficiently small value, the portable terminal is present at a decrease point. Also, it is possible to increase the possibility of determining that the vehicle is in the passenger compartment. However, on the other hand, even when the mobile terminal is actually present outside the vehicle, the possibility of erroneously determining that the mobile terminal is present in the vehicle interior increases.

  Further, if the threshold value for determination is set to a sufficiently large value in the configuration disclosed in Patent Document 1, there is a possibility that the possibility of erroneous determination that the portable terminal exists in the vehicle compartment will increase when the portable terminal exists outside the vehicle compartment. However, even when the portable terminal is present in the vehicle compartment such as the decrease point, the possibility of erroneously determining that the portable terminal is present outside the vehicle exterior increases. That is, in the configuration of Patent Document 1, it may be erroneously determined that the portable terminal is present at a position different from the actual position.

  The present disclosure has been made based on the above circumstances, and an object of the present disclosure is to provide a position determination system for a vehicle capable of reducing the possibility of erroneous determination of the position of a portable terminal.

  A position determination system for a vehicle according to the present disclosure for achieving the object is configured to receive a position of a portable terminal by receiving a radio signal transmitted from a portable terminal carried by a user using radio waves of a predetermined frequency band. A vehicle interior receiving unit (132) for receiving a radio signal transmitted from a portable terminal via a vehicle interior antenna installed in a vehicle interior of a vehicle, the vehicle interior position determining system for estimating a vehicle interior; Via an in-vehicle outdoor antenna (121) for detecting the received signal strength of the wireless signal received by the vehicle as an in-vehicle room strength, an out-of-vehicle antenna (121) for receiving a wireless signal coming from the out-of-vehicle Outdoor reception unit (122) for receiving a wireless signal transmitted from a portable terminal, and outdoor intensity for detecting the reception intensity of the wireless signal received by the outdoor reception unit as an intensity outside the vehicle Position determination that determines whether a portable terminal is present outside the vehicle based on the indoor unit strength detected by the outlet (123) and the vehicle interior strength detection unit and the outdoor strength detected by the outdoor strength detection unit The outdoor antenna is disposed in a predetermined area which can be regarded as the vicinity of the window provided in the vehicle on the outer surface of the vehicle.

  In the above-described configuration, the outdoor antenna is disposed in the vicinity of the window portion, which is a passage of radio waves from the outdoor side to the passenger compartment. According to such a configuration, when the signal from the portable terminal existing outside the vehicle is received by the in-vehicle antenna, the possibility that the signal is also received by the out-of-vehicle antenna is high. In addition, since the outdoor antenna is closer to the portable terminal than the indoor antenna, the outdoor strength is likely to be higher than the indoor strength. That is, although the portable terminal is present outside the vehicle, a reverse phenomenon in which the vehicle interior strength is higher than the vehicle outside strength is less likely to occur.

  The above effects are the same as in the case where the portable terminal is present near the window outside the vehicle. Then, on the premise of the above configuration, the position determination unit determines whether or not the portable terminal is present outside the vehicle based on the vehicle interior strength and the vehicle exterior strength. According to such a configuration, it is possible to reduce the possibility of erroneous determination that the portable terminal is present in the vehicle compartment, even though the portable terminal is present outside the vehicle compartment.

  In addition, the code | symbol in the parentheses described in the claim shows correspondence with the specific means as described in embodiment mentioned later as one aspect, Comprising: The technical scope of this indication is limited. is not.

1 is a conceptual diagram showing a schematic configuration of a communication system 100 according to the present disclosure. It is a figure for demonstrating the structure of the vehicle Hv. FIG. 1 is a block diagram showing a schematic configuration of an in-vehicle system 10. FIG. 2 is a block diagram showing the configuration of an outdoor communication device 12; FIG. 6 is a conceptual top view of a vehicle Hv for illustrating the mounting position of the in-vehicle outdoor communication device 12; It is a notional side view of vehicles Hv for explaining the mounting position of communications device 12 in the degree of a car. It is a conceptual diagram for demonstrating the structure of the attachment part of the communication apparatus 12 in-vehicle outside. FIG. 2 is a block diagram showing a configuration of a vehicle interior communication device 13. It is a functional block diagram showing composition of attestation ECU11. It is a figure for demonstrating the action | operation of a 1st comparison structure. It is a figure for demonstrating the effect of this embodiment. It is a figure for demonstrating the effect of this embodiment. It is a figure for demonstrating the action | operation of a 2nd comparison structure. It is a figure which shows an example of a body shape in case the characteristic of a 2nd comparison structure appears notably. It is a figure which shows the modification of the attachment position of the communication apparatus 12 in the exterior of a vehicle. It is a figure which shows the modification of the attachment position of the communication apparatus 12 in the exterior of a vehicle. It is a figure which shows the modification of the attachment position of the communication apparatus 12 in-vehicle outside. It is a conceptual diagram for demonstrating the attachment attitude | position of the communication apparatus 12 in the exterior of a vehicle which uses a directional antenna.

[Embodiment]
Hereinafter, embodiments of the present disclosure will be described using the drawings. FIG. 1 is a diagram illustrating an example of a schematic configuration of a communication system 100 according to the present disclosure. As shown in FIG. 1, the communication system 100 includes an on-vehicle system 10 mounted on a vehicle Hv, and a portable terminal 90 which is a communication terminal carried by a user of the vehicle Hv.

  The portable terminal 90 is a communication terminal having a function of performing communication (hereinafter, referred to as near-field communication) conforming to a predetermined near-field wireless communication standard capable of setting the communication distance to 10 meters or more. As a short distance wireless communication standard here, for example, Bluetooth Low Energy (Bluetooth is a registered trademark), Wi-Fi (registered trademark), ZigBee (registered trademark) or the like can be adopted. According to these short distance wireless communication standards, the communication distance can be set up to about 100 m. Here, as an example, it is assumed that the portable terminal 90 and the in-vehicle system 10 are configured to perform communication in accordance with the Bluetooth Low Energy standard.

  The portable terminal 90 and the in-vehicle system 10 may be configured to perform wireless communication using an impulse signal used in ultra wide band (UWB: Ultra Wide Band) communication. The impulse signal used in UWB communication is a signal having a pulse width of a very short time (for example, 2 ns) and a bandwidth of 500 MHz or more (that is, ultra-wide band width). As a frequency band (hereinafter, UWB band) usable for the UWB communication, there are 3.1 GHz to 16 GHz, 3.4 GHz to 4.8 GHz, 7.25 GHz to 16 GHz, 22 GHz to 29 GHz, and the like.

  The standard for performing the wireless communication between the portable terminal 90 and the in-vehicle system 10, and the frequency of the radio wave used for the wireless communication (hereinafter, system radio wave) may be selected as appropriate. Here, as an example, the portable terminal 90 and the in-vehicle system 10 perform communication using radio waves in the 2.4 GHz band, but the present invention is not limited to this. As another aspect, the system use radio wave may be a radio wave of 2.5 GHz to 10 GHz as described above. Also, radio waves of less than 2.4 GHz may be used. From the viewpoint of data transmission efficiency, the frequency of the system use radio wave is preferably 1 GHz or more.

  The portable terminal 90 only needs to have the function of performing the above-described short distance communication, and for example, a smartphone can be used as the portable terminal 90. Of course, the portable terminal 90 may be a tablet terminal, a wearable device, a portable music player, a portable game machine, a wireless tag or the like. A general-purpose communication terminal can be adopted as the portable terminal 90. In addition, the portable terminal 90 may be a communication device (so-called portable device for a vehicle) having a function as a key of the vehicle Hv.

  The portable terminal 90 wirelessly transmits a communication packet including transmission source information at a predetermined transmission interval, thereby notifying (that is, advertising) the presence of itself to surrounding communication terminals provided with the near field communication function. . The transmission source information is, for example, identification information (hereinafter referred to as a terminal ID) assigned to the portable terminal 90. The terminal ID functions as information for identifying the other communication terminal and the portable terminal 90.

  Hereinafter, for convenience, a communication packet periodically transmitted for the purpose of advice is referred to as an advertisement packet. Note that the transmission interval of the advertise packet may be a fixed value (for example, 100 milliseconds) or may be variable according to the operation status of the portable terminal 90. For example, when a predetermined application using the short distance communication function in the portable terminal 90 is operating in the foreground, the transmission interval is set to a relatively short time (for example, 50 milliseconds). On the other hand, when the application is not operating in the foreground, the transmission interval is set to a relatively long time (200 milliseconds).

  The in-vehicle system 10 also has the above-described short-range communication function, and the portable terminal 90 can perform short-range communication with the in-vehicle system 10 by receiving a signal (for example, an advertise packet) transmitted from the portable terminal 90. It detects that it exists in the range. Hereinafter, the range in which the in-vehicle system 10 can make short-distance communication with the portable terminal 90 is also referred to as a vehicle communication area.

  The on-vehicle system 10 transmits a signal (hereinafter referred to as a response request signal) for requesting a return of the response signal to the portable terminal 90 at a predetermined timing, and receives the response signal from the portable terminal 90. May be configured to detect that they are present in the vehicle communication area of the in-vehicle system 10. In that case, when the portable terminal 90 receives the response request signal transmitted from the in-vehicle system 10, the portable terminal 90 returns the response signal by short-distance communication. It is assumed that transmission source information is included in the signal transmitted by the portable terminal 90 as a more preferable aspect.

<About the composition of the vehicle Hv>
First, the configuration of the vehicle Hv will be described with reference to FIG. Here, as an example, the vehicle Hv is a private car, but as another aspect, it may be a taxi, a bus, a truck or the like. It may be a vehicle whose main purpose is other than the movement of the occupant.

Various body panels provided in the vehicle Hv are realized using metal members. Here, the body panel is a group of parts providing the outer appearance of the vehicle Hv. The body panel includes a side body panel assembled to a body shell, a roof panel, a rear end panel, a bonnet panel, a door panel, a pillar and the like. Hereinafter, a configuration in which various body panels are combined is referred to as a body 21.
Since the metal plate has the property of reflecting radio waves, the body panel of the vehicle Hv reflects radio waves used by the system. That is, the vehicle Hv includes the body 21 that blocks the straight propagation of the system use radio wave. The body shell itself may be realized using a metal member such as a steel plate, or may be formed using a carbon-based resin. Here, as a more preferable aspect, the body shell is also made of metal.

  Also, blocking here is ideally reflection, but it is not limited to this. A configuration capable of attenuating system use radio waves by a predetermined level (hereinafter, target attenuation level) or the like corresponds to a configuration for blocking the propagation of system use radio waves. The target attenuation level may be, for example, 5 dB as a value that causes a significant difference in the signal strength of radio waves inside and outside the vehicle cabin. Various body panels constituting the body 21 of the vehicle Hv may be formed using a carbon-based resin. However, in this case, it is assumed that the carbon-based resin, which is the material of the body, has a composition sufficiently filled with carbon so as to attenuate the propagation of radio waves used by the system by 5 dB or more.

  In addition, even when the body panel of the vehicle Hv is formed using a general-purpose resin containing no carbon, the surface of the body panel is provided with a specific metal pattern having a function of blocking the propagation of the system use radio wave. Therefore, it may be configured to block the propagation of system use radio waves. The metal pattern (hereinafter referred to as a shield pattern) having a function of blocking the propagation of system use radio waves is, for example, a pattern in which thin wire conductors such as silver nanowires are arranged in a lattice at intervals of 12 wavelengths or less of system use radio waves. Here, the thin line refers to one having a line width of 50 μm or less.

  Also, the shield pattern can be realized by using a well-known meta-surface structure. The meta-surface structure is a structure in which artificial structures called unit cells are repeatedly arranged. According to the meta-surface structure, only radio waves in a specific frequency band (here, system radio waves) can be selectively reflected or attenuated (ie, blocked). Further, the body 21 of the vehicle Hv may be configured to block the propagation of radio waves for system use by applying a paint containing metal powder or carbon powder on a body made of a general-purpose resin. Furthermore, a film (hereinafter referred to as a shield film) for blocking the propagation of system use radio waves may be attached to the body 21.

In addition, the vehicle Hv has a roof portion 23 provided by a roof panel, and includes a plurality of pillars that are members for supporting the roof panel. The plurality of pillars are referred to as an A pillar, a B pillar, and a C pillar in order from the front end to the rear end. Here, as an example, the vehicle Hv is a vehicle having a front seat and a rear seat, and includes, as pillars, an A pillar 24A, a B pillar 24B, and a C pillar 24C.
The A-pillar 24A is a pillar provided in front of the front seat. In other words, the A-pillar 24A is a pillar disposed diagonally in front of the driver and the front passenger seat. The B-pillar 24B is a pillar provided between the front seat and the rear seat. The C-pillar 24C is a pillar provided behind the rear seat diagonally. Note that as another aspect, the vehicle Hv may be a vehicle provided with a D-pillar that is the fourth pillar from the front and an E-pillar that is the fifth pillar. A part or all of each pillar is realized using a metal member such as a high tensile steel plate. As another mode, the pillar may be made of carbon fiber or resin. Furthermore, it may be realized by combining various materials.

  As described above, when all the doors of the vehicle Hv are closed as a whole, the system use radio wave enters the vehicle compartment from outside the vehicle through the window portion 22 or leaks from the vehicle interior to the vehicle exterior It is configured to That is, the window portion 22 is configured to act as a route of the system use radio wave. Here, the window portion 22 is a front window, a window (a so-called side window) provided on a side portion of the vehicle Hv, a rear window, or the like.

  As another mode, the window glass provided on the door or the like of the vehicle Hv may also be configured to block the straight propagation of the system use radio wave. The window glass here is a transparent member disposed in the window 22 provided in the vehicle Hv, and its material may not be strictly glass. For example, it may be realized using an acrylic resin or the like. That is, the window glass here is a transparent member which functions as a windshield.

<Configuration of In-Vehicle System 10>
Next, the electrical configuration and operation of the in-vehicle system 10 will be described. As shown in FIG. 3, the in-vehicle system 10 includes an authentication ECU 11, an outdoor communication device 12, an indoor communication device 13, a touch sensor 14, a locking button 15, a start button 16, a body ECU 17, and an engine ECU 18. In addition, ECU in a member name is an abbreviation of Electronic Control Unit, and means an electronic control unit. The in-vehicle system 10 corresponds to a position determination system for a vehicle.

  The outdoor communication device 12, the indoor communication device 13, the body ECU 17 and the engine ECU 18 are connected to the authentication ECU 11 via a communication network built in the vehicle or a dedicated signal line so as to enable bidirectional communication. There is. In addition, the touch sensor 14, the start button 16, and the locking button 15 are configured such that output signals are directly or indirectly input to the authentication ECU 11.

  The authentication ECU 11 roughly estimates the position of the portable terminal 90 with respect to the vehicle Hv in cooperation (in other words, cooperation) with other configurations such as the communication terminal outside the vehicle, and controls the vehicle according to the estimation result ECU that implements the The authentication ECU 11 is realized by using a computer. That is, the authentication ECU 11 includes a CPU 111, a RAM 112, a flash memory 113, and the like. The CPU 111 is an arithmetic processing unit that executes various arithmetic processing. The RAM 112 is a volatile storage medium, and the flash memory 113 is a rewritable non-volatile storage medium.

  The flash memory 113 has registered therein a terminal ID assigned to the portable terminal 90 owned by the user. Hereinafter, for the sake of convenience, the terminal ID registered in the flash memory 113 as the terminal ID of the portable terminal 90 is also described as a registration ID. Further, the flash memory 113 stores a program (hereinafter, referred to as a position determination program) for causing a normal computer to function as the authentication ECU 11. The above-described position determination program may be stored in a non-transitory tangible storage medium. Execution of the position determination program by the CPU 111 corresponds to execution of a method corresponding to the position determination program.

  The details of the authentication ECU 11 will be described later separately. Even when the traveling power supply (for example, the ignition power supply) of the vehicle Hv is turned off, the authentication ECU 11 is supplied with electric power necessary and sufficient for performing position determination processing described later from the on-vehicle battery. It is configured.

  The outdoor communication device 12 is a communication module for performing short distance communication with the portable terminal 90 existing outside the vehicle. The outdoor communication device 12 includes an outdoor antenna 121, a transmission / reception unit 122, a strength detection unit 123, and a communication microcomputer 124, as shown in FIG. The outdoor antenna 121 is an antenna for transmitting and receiving radio waves of a frequency band used for communication with the portable terminal 90 (that is, radio waves used by the system). In the present embodiment, as an example, the outdoor antenna 121 is an antenna (so-called nondirectional antenna) that provides nondirectionality (in other words, isotropy) on a predetermined plane determined with respect to the attitude of the antenna element. As another aspect, the outdoor antenna 121 may have directivity. It is assumed that the nondirectional antenna as the outdoor antenna 121 is disposed in a posture providing nondirectionality in the horizontal plane of the vehicle. The vehicle horizontal plane is a plane orthogonal to the height direction of the vehicle Hv.

The transmission / reception unit 122 demodulates the signal received by the outdoor antenna 121 and provides the communication microcomputer 124 with the signal. In addition, the signal input from the authentication ECU 11 via the communication microcomputer 124 is modulated, output to the outdoor antenna 121, and emitted as a radio wave. The transmission / reception unit 122 corresponds to a reception unit outside the vehicle. A communication area for the outdoor communication device 12 is determined by the amplification factor of the reception signal and the transmission power of the transmission signal.
The communication area of the communication terminal outside the vehicle 12 corresponds to a range in which communication with the portable terminal 90 is possible. That is, the communication area of the outdoor communication device 12 can receive the signal transmitted from the portable terminal 90 at a level that can be demodulated by the outdoor communication device 12, and the signal transmitted by the outdoor communication device 12 is a mobile terminal At 90, it is a range that can be reached while maintaining the intensity that can be demodulated. As the transmission power and the amplification factor of the reception signal are larger, the communication area of the outdoor communication device 12 is larger. Here, as an example, the outdoor communication device 12 is configured such that a communication area is within 10 m from the outdoor antenna 121.

  The strength detection unit 123 is configured to sequentially output data (so-called RSSI: Received Signal Strength Indication) indicating the strength of a signal received by the transmission / reception unit 122 via the outdoor antenna 121. The strength detected by the strength detection unit 123 (hereinafter, received strength) is associated with the terminal ID included in the received data and sequentially provided to the communication microcomputer 124. The reception strength may be expressed, for example, in the unit of power [dBm]. For convenience, data in which the reception strength and the terminal ID are associated is referred to as reception strength data. The strength detection unit 123 corresponds to the strength detection unit outside the vehicle.

  The communication microcomputer 124 is a microcomputer that controls the exchange of data with the authentication ECU 11, and is realized using an MPU, a RAM, and the like. The communication microcomputer 124 sequentially provides the reception data input from the transmission / reception unit 122 to the authentication ECU 11 or based on a request from the authentication ECU 11. That is, the data received by the transmission / reception unit 122 is provided to the authentication ECU 11 via the communication microcomputer 124.

  Further, when the communication microcomputer 124 acquires the reception strength data from the strength detection unit 123, the communication microcomputer 124 accumulates the reception strength data in a RAM (not shown). The reception strength data acquired sequentially may be sorted in chronological order and stored in the RAM, for example, so that the reception strength of the latest reception data is at the top. Data that has been stored for a certain period of time may be sequentially discarded. That is, the reception strength data is held in the RAM for a fixed time. The communication microcomputer 124 provides the reception intensity data stored in the RAM based on the request from the authentication ECU 11. The received intensity data provided to the authentication ECU 11 may be deleted from the RAM. The storage period of the reception strength data in the communication microcomputer 124 may be designed appropriately.

  In the present embodiment, the reception intensity data output from the transmission / reception unit 122 is temporarily stored in the RAM, and the communication microcomputer 124 provides the authentication ECU 11 with the reception intensity data accumulated in the RAM based on the request from the authentication ECU 11. Although it does, it does not restrict to this. The reception intensity data may adopt a configuration in which the authentication ECU 11 is sequentially provided.

  At least one outdoor communication device 12 having the above configuration is disposed at a predetermined position on the outer surface of the vehicle Hv so as to form a predetermined communication area outside the vehicle. Here, the outer surface portion is a body portion in contact with the space outside the vehicle Hv, and includes a side surface portion, a rear surface portion, and a front surface portion of the vehicle Hv. Here, as an example, the in-vehicle system 10 includes the left communication device 12A and the right communication device 12B as the outdoor communication device 12, as shown in FIG.

  The left communication device 12A is disposed in the middle of the B pillar 24B located on the left side of the vehicle, as shown in FIG. 6, on the outer surface of the vehicle compartment with the left side of the vehicle Hv in line of sight. The surface on the outer side of the passenger compartment is a surface that faces in the direction in which the space outside the passenger compartment exists as viewed from the passenger compartment. In order to clearly indicate the position of the left communication device 12A in FIGS. 5 to 6, the size is exaggerated and hatched with oblique lines.

  The middle step portion of the B pillar 24B corresponds to a portion positioned in the middle when the B pillar 24B is equally divided into three in the vehicle height direction. The region within the line of sight for the left communication device 12A is a region where the signal transmitted by the left communication device 12A can be reached directly. Further, since the propagation path of the wireless signal is reversible, the line-of-sight region for the left communication device 12A corresponds to a region where the signal transmitted from the portable terminal 90 can be directly received. Do. Note that the area where the wireless signal directly reaches is an area that can be reached substantially straightly, and includes, for example, an area that passes through an object such as glass and reaches.

By the way, the B-pillar 24B is realized by a metal member. That is, as shown in FIG. 7, a metal body exists on the rear side which is the vehicle interior side as viewed from the left side communication device 12A. As a result, most of the vehicle interior space is out of sight for the left side communication device 12A, and it is difficult to receive a signal from the portable terminal 90 existing in the vehicle interior.
The non-line-of-sight region for the left side communication device 12A is a region where the signal transmitted by the left side communication device 12A does not reach directly. According to another point of view, “out of sight for the left communication device 12A” corresponds to an area where the signal transmitted from the portable terminal 90 can not be received directly because the propagation path of the wireless signal is reversible. . Even when the portable terminal 90 exists outside the line-of-sight of the left communication device 12A, the signal transmitted from the portable terminal 90 reaches the left communication device 12A by being reflected by various structures. There is.

  The right side communication device 12B is an outdoor communication device 12 paired with the left side communication device 12A. The right side communication device 12B is disposed at a position opposite to the left side communication device 12A on the right side surface of the vehicle Hv. That is, in the middle step portion of the B pillar 24B on the right side of the vehicle, the right side of the vehicle Hv is disposed within the line of sight on the outer surface of the B pillar 24B. As described above, by providing the left communication device 12A and the right communication device 12B as the in-vehicle communication device 12, the in-vehicle system 10 forms a communication area outside the vehicle, centering on the side region of the vehicle Hv.

  The in-vehicle communication device 13 is also a communication module for performing near field communication with the portable terminal 90. However, while the communication terminal 12 outside the vehicle is a communication module aiming to perform short distance communication with the portable terminal 90 existing outside the vehicle, the communication terminal 13 inside the vehicle is a mobile terminal existing inside the vehicle. 90 is a communication module intended to communicate with 90. Along with this, the in-vehicle communication device 13 differs from the in-vehicle communication device 12 in the installation position and the like.

  At least one in-vehicle communication device 13 is provided in the vehicle compartment so that the vehicle interior space becomes a communication area. The communication area for the in-vehicle communication device 13 corresponds to a range in which mutual communication with the portable terminal 90 is possible, similarly to the communication area for the in-vehicle communication device 12. The aforementioned vehicle communication area is an area formed by combining a communication area formed by a plurality of outdoor communication devices 12 and a communication area formed by at least one vehicle indoor communication device 13.

  In the present embodiment, as an example, the in-vehicle communication device 13 is disposed in the vicinity of the center console so that the entire area of the in-vehicle space is a communication area. Of course, the installation position of the in-vehicle communication device 13 is not limited to this. The in-vehicle communication device 13 may be disposed at a position approximately at the same height as the door handle in the vicinity of the central portion in the vehicle width direction of the instrument panel. Further, the in-vehicle communication device 13 may be disposed near the boundary between the center console and the instrument panel. In addition, for example, it may be disposed at the foot of the driver's seat or at the side surface of the door for the driver's seat on the vehicle interior side. Further, the in-vehicle communication device 13 may be disposed at the center of the in-ceiling ceiling portion. A plurality of in-vehicle communication devices 13 may be provided in the vehicle cabin. For example, the in-vehicle communication device 13 for the front seat and the in-vehicle communication device 13 for the rear seat may be provided. The in-vehicle communication device 13 for the rear seat may be disposed inside the seat of the rear seat.

  The specific configuration of the in-vehicle communication device 13 as the communication module can be the same as the in-vehicle communication device 12. That is, as shown in FIG. 8 as a finer component, the in-vehicle communication device 13 has an antenna (hereinafter referred to as an in-vehicle antenna) 131 for transmitting / receiving a system use radio wave, a transmitting / receiving unit 132, a strength detecting unit 133, and a communication microcomputer. And 134. The functions of these various configurations are the same as the configurations provided in the outdoor communication device 12, and therefore the description thereof is omitted. The reception intensity detected by the intensity detection unit 133 is provided to the authentication ECU 11 via the communication microcomputer 134. The transmission / reception unit 132 corresponds to a vehicle interior reception unit. The intensity detection unit 123 corresponds to a vehicle interior intensity detection unit.

  For convenience, hereinafter, when the outdoor communication device 12 and the indoor communication device 13 are not distinguished from one another, they are also described as communication devices. The transmission / reception units 122 and 132 are also described as transmission / reception units when they are not distinguished from each other. The same applies to the intensity detection units 123 and 133 and the communication microcomputers 124 and 134. Furthermore, when the antenna 121 outside the passenger compartment and the antenna 131 inside the passenger compartment are not distinguished, they are described as an antenna.

The touch sensor 14 is mounted on each door handle of the vehicle Hv and detects that the user is touching the door handle. The detection results of each touch sensor 14 are sequentially output to the authentication ECU 11. The locking button 15 is a button for the user to lock the door of the vehicle Hv. It may be provided on the handle of each door of the vehicle Hv. When the lock button 15 is pressed by the user, an electric signal indicating that is output to the authentication ECU 11.
The start button 16 is a push switch for the user to start the drive source (for example, an engine). When the user performs a push operation, the start button 16 outputs an electrical signal indicating that to the authentication ECU 11. Here, as an example, the vehicle Hv is a vehicle including an engine as a motive power source, but is not limited thereto. The vehicle Hv may be an electric car or a hybrid car. When the vehicle Hv is a vehicle equipped with a motor as a drive source, the start button 16 is a switch for starting the drive motor.

  The body ECU 17 is an ECU that controls various actuators mounted on the vehicle Hv based on signals input from various on-vehicle sensors and the authentication ECU 11. Here, the on-vehicle sensor is a courtesy switch or the like disposed for each door. The courtesy switch is a sensor that detects the opening and closing of the door. For example, the body ECU 17 locks and unlocks each door by outputting a predetermined control signal to a door lock motor that configures the lock mechanism of each door based on an instruction from the authentication ECU 11. The engine ECU 18 is an ECU that controls the operation of an engine mounted on the vehicle Hv.

<About the function of authentication ECU 11>
Next, the function of the authentication ECU 11 will be described with reference to FIG. The authentication ECU 11 provides functions corresponding to various functional blocks shown in FIG. 9 by the CPU 111 executing the position determination program described above. That is, the authentication ECU 11 includes a vehicle information acquisition unit F1, a transmission processing unit F2, a reception processing unit F3, a reception intensity acquisition unit F4, a position determination unit F5, and a vehicle control unit F6 as functional blocks.

  Note that part or all of the functions of the authentication ECU 11 may be realized as hardware using a logic circuit or the like. The aspect implemented as hardware also includes an aspect implemented using one or more ICs. Further, part or all of the functional blocks included in the authentication ECU 11 may be realized by a combination of execution of software by the CPU 111 and hardware members.

  The vehicle information acquisition unit F1 acquires various information (hereinafter, vehicle information) indicating the state of the vehicle Hv from various sensors and devices (for example, the touch sensor 14) mounted on the vehicle Hv. As the vehicle information, for example, the presence or absence of a touch on the door handle, the presence or absence of depression of the start button 16, the presence or absence of depression of the lock button 15, or the like corresponds.

  In addition, the information contained in vehicle information is not restricted to what was mentioned above. The vehicle information also includes a shift position detected by a shift position sensor (not shown) and a detection result of a brake sensor that detects whether the brake pedal is depressed. The vehicle information acquired by the vehicle information acquisition unit F1 is given a time stamp indicating the acquisition time, and is stored in the RAM 112 or the like. The vehicle information storage destination may be the flash memory 113.

  The transmission processing unit F2 generates data addressed to the portable terminal 90, and outputs the data to at least one of the outdoor communication device 12 and the indoor communication device 13. Thereby, a signal corresponding to desired data is transmitted as a radio wave. For example, the transmission processing unit F2 generates a response request signal based on a request from a reception strength acquisition unit F4, which will be described later, and transmits the response request signal from each communication device. The reception processing unit F3 is configured to obtain reception data from each of the in-vehicle communication device 12 and the in-vehicle communication device 13.

  The reception strength acquisition unit F4 is configured to acquire reception strength data from each of the outdoor communication device 12 and the indoor communication device 13. The reception strength acquisition unit F4 of this embodiment requests the transmission processing unit F2 to transmit a response request signal at a predetermined sampling cycle. As a result, the response request signal is periodically transmitted from each communication device at a predetermined sampling cycle.

Further, the reception strength acquisition unit F4 requests each communication device to provide reception strength data at a timing when a predetermined response standby time has elapsed since the transmission of the response request signal is requested. The response standby time is a parameter determined according to the time taken from the transmission processing unit F2 transmitting the response request signal to the reception processing unit F3 receiving the response signal from the portable terminal 90.
When the reception intensity data provided from the in-vehicle communication device 12 includes the reception intensity of the signal transmitted from the portable terminal 90, the reception intensity acquisition unit F4 takes the reception intensity as the intensity outside the vehicle compartment. It is stored in the RAM 112. The data of the reception intensity acquired from the left communication device 12A and the data of the reception intensity acquired from the right communication device 12B may be stored separately.

  Similarly, when the reception intensity data provided from the in-vehicle communication device 13 includes the reception intensity of the signal transmitted from the portable terminal 90, the reception intensity acquisition unit F4 calculates It is stored in the RAM 112 as the cabin strength. That is, the reception intensity at each communication device (in other words, each antenna) is handled separately for each communication device. The reception strength acquisition unit F4 corresponds to a configuration for acquiring the reception strength at each antenna of the signal transmitted from the portable terminal 90.

  In addition, whether the reception strength of a certain reception signal is the reception strength of the signal transmitted from the portable terminal 90 is determined based on the terminal ID and the registration ID associated with the reception strength. Can. The reception strength of the signal from other than the portable terminal 90 may be discarded. The process of discarding the reception intensity of the signal from other than the portable terminal 90 may be performed in the communication device. In that case, it is assumed that the terminal ID of the portable terminal 90 is also registered in the communication device. In the case where the plurality of mobile terminals 90 are registered in the in-vehicle system 10 and when the reception strengths from the plurality of mobile terminals 90 can be acquired, the reception strength acquisition unit F4 is of each mobile terminal 90. The reception strength may be stored separately for each terminal ID.

  The position determination unit F5 is configured to determine the position of the portable terminal 90 based on the reception strength of the portable terminal 90 acquired by the reception strength acquisition unit F4. For example, the position determination unit F5 compares the strength of the outside of the vehicle acquired by the reception strength acquisition unit F4 with the strength inside the vehicle, and the portable terminal 90 exists outside the vehicle when the strength outside the vehicle is higher than the strength inside the vehicle It will be determined. On the other hand, when the strength in the passenger compartment is higher than the strength outside the passenger compartment, it is determined that the portable terminal 90 is present in the passenger compartment. The determination result of the position determination unit F5 is provided to the vehicle control unit F6.

In addition, when the signal from the portable terminal 90 can be received by both the left side communication device 12A and the right side communication device 12B, the value of the higher one of the plurality of vehicle outdoor strengths corresponding to the respective outdoor communication devices 12 May be adopted as a comparison object with the strength in the passenger compartment. When the signal from the portable terminal 90 can be received by both the left side communication device 12A and the right side communication device 12B, that is, the outdoor intensity in each of the plurality of outdoor communication devices 12 can be acquired as the outdoor intensity. Corresponds to the case where
In the present embodiment, as an example, the authentication ECU 11 acquires the reception intensity of the response signal transmitted from the portable terminal 90 by transmitting the response request signal, and performs the position determination process using the reception intensity. Although it does, it does not restrict to this. When the portable terminal 90 is configured to sequentially transmit a predetermined signal (for example, an adize packet), the position of the portable terminal 90 is determined using the reception strength of the periodically transmitted signal. It is also good.

  The vehicle control unit F6 is configured to perform vehicle control according to the user operation based on the determination result of the position determination unit F5 and the user operation on the vehicle Hv. For example, when the vehicle control unit F6 determines that the door of the vehicle Hv is locked and the position determination unit F5 determines that the portable terminal 90 exists outside the vehicle exterior, the touch sensor 14 handles the steering wheel by the user. When an operation of touching is detected, the door is unlocked in cooperation with the door lock motor. Further, for example, when the start button 16 is pressed by the user when the engine is stopped and the position determination unit F5 determines that the portable terminal 90 exists in the vehicle compartment, the engine ECU 18 cooperates with the engine ECU 18 Start the engine. In addition, the content of the vehicle control performed by the vehicle control unit F6 may be appropriately designed in accordance with the user's operation content and the state of the vehicle Hv.

  In addition, it is preferable that the result of having implemented authentication of whether a user is a regular user separately is used for the conditions of execution of vehicle control. That is, it is preferable that the vehicle control is performed only when the user authentication is successful. The user authentication itself may be performed using biometric information such as a user's fingerprint, iris, and vein pattern. Also, the user may be indirectly authenticated by authenticating the portable terminal 90 without directly authenticating the user itself. Authentication of the portable terminal 90 by wireless communication may be performed in accordance with a known method such as a challenge response method. The function for authenticating the user (hereinafter, user authentication function) may be included in the authentication ECU 11 or may be included in another ECU.

<About the effect of this embodiment>
Here, the effects of the present embodiment will be described by introducing the first comparison configuration. In the first comparison configuration here, similarly to Patent Document 1, it is determined whether the portable terminal 90 exists outside the vehicle by comparing the reception intensity in the in-vehicle communication device and one determination threshold value. Configuration. In the first comparison configuration, it is determined that the portable terminal is present in the compartment when the vehicle interior strength is equal to or higher than the determination threshold, and the portable terminal is present outside the vehicle when the average strength of the RSSI is less than the determination threshold. It will be determined.
If the setting value of the determination threshold value is too low in such a first comparison configuration, there is a possibility that the portable terminal may be erroneously determined to be present in the vehicle compartment although the portable terminal is actually present outside the vehicle exterior. For example, if the threshold value for determination is set to a sufficiently low value so that the portable terminal can be determined to be present in the vehicle compartment in the entire area of the vehicle interior, as shown in FIG. Nevertheless, there are some points at which it is erroneously determined to exist in the vehicle compartment. On the other hand, if the setting value of the determination threshold value is too high in the first comparison configuration, there is a possibility that the portable terminal may be erroneously determined to be outside the vehicle compartment although it is actually inside the vehicle compartment. Therefore, in the first comparison configuration, in consideration of those circumstances, it is necessary to set the determination threshold value to a value that is unlikely to cause an erroneous determination.

  On the other hand, according to the configuration of the present embodiment, it is determined whether the portable terminal 90 is present in the vehicle interior by comparing the strength inside the vehicle compartment and the strength outside the vehicle compartment. That is, the determination threshold may not be set. Therefore, there is no difficulty in designing the determination threshold.

  Further, in the present embodiment, the outdoor communication device 12 is disposed in the vicinity of the window frame, that is, along the path of the radio wave from the outdoor to the vehicle interior, so the signal from the portable terminal 90 existing outside the vehicle In the case of being received by the indoor communication device 13, the possibility of being received by the outdoor communication device 12 is high. In addition, since the outdoor communication device 12 is closer to the portable terminal 90 than the indoor communication device 13, the outdoor strength is likely to be higher than the indoor strength.

  The case where the signal from the portable terminal 90 existing outside the vehicle is received by the in-vehicle communication device 13 is the case where the portable terminal 90 exists near the window 22 outside the vehicle exterior as shown in FIG. . Specifically, for example, the user housing the portable terminal 90 in the chest pocket of the clothes stands near the door. That is, when the user puts the hand on the door handle in a state where the portable terminal 90 is accommodated in the chest pocket of the clothes, a signal from the portable terminal 90 existing outside the vehicle is received by the in-vehicle communication device 13 Easy to

  However, as described above, since the out-of-vehicle communication device 12 is closer to the portable terminal 90 than the in-vehicle communication device 13, the in-vehicle communication device 13 receives a signal from the portable terminal 90 existing outside of the vehicle. Even if there is, the strength outside the vehicle is higher than the strength inside the vehicle. That is, the risk of an erroneous determination can be reduced if the portable terminal 90 is present in the passenger compartment despite the presence outside the passenger compartment.

  If the user holds the portable terminal 90 in a possession mode in which the portable terminal 90 is located below the lower end of the window 22 as shown in FIG. Since the portable terminal 90 exists, the in-vehicle communication device 13 can not directly receive the signal from the portable terminal 90. In the case where the portable terminal 90 exists below the lower end of the window 22 outside the vehicle, the signal from the portable terminal 90 received by the in-vehicle communication device 13 is a surface of the roof 23 on the vehicle interior side, etc. It is a reflected signal (hereinafter referred to as a reflected wave).

  On the other hand, the outdoor communication device 12 can directly receive the wireless signal from the mobile terminal 90 even when the mobile terminal 90 exists below the lower end of the window 22 outside the vehicle. It is. Note that the aspect of directly receiving the wireless signal from the portable terminal 90 also includes the aspect of penetrating and receiving the human body and clothes. Naturally, the received intensity of the signal (direct wave from here on) directly propagated without being reflected by another object is larger than the received intensity of the signal reflected by the other object (that is, the reflected wave) There is expected. Further, since the outside communication unit 12 is disposed near the window frame, that is, along the radio wave passage from the outside of the vehicle to the inside of the vehicle, the signal from the portable terminal 90 existing outside the vehicle is If it is received, there is a high possibility that it is also received by the outdoor communication device 12.

  Therefore, as shown in FIG. 12, even when the user holds the portable terminal 90 in a possession mode in which the portable terminal 90 is located below the lower end of the window 22, the portable terminal 90 is outside the vehicle compartment. It is possible to reduce the risk of an erroneous determination if the vehicle is present in the vehicle despite the presence. The case where the portable terminal 90 is located below the lower end of the window 22 is, for example, the case where the user accommodates the portable terminal 90 in a bag or a pocket of a trouser.

  By the way, as another configuration for determining the position of the portable terminal 90 by comparing the strength outside the vehicle with the strength inside the vehicle (hereinafter referred to as the second comparison configuration), as shown in FIG. A configuration in which the communication device 12 is disposed can be considered.

However, radio waves generally used in near field communication are high-frequency signals such as 2.4 GHz and are more rectilinear than radio waves in a low frequency (so-called LF: Low Frequency) band of 300 kHz or less. That is, propagation due to wraparound (in other words, diffraction) is less likely to occur.
Moreover, it is preferable that the communication terminal 12 outside a vehicle is arrange | positioned in the attitude | position in which directivity becomes substantially parallel with a vehicle horizontal surface. According to such mounting posture, the communication area can be widely formed around the vehicle, and short distance communication can be performed with the portable terminal 90 in the process in which the user is approaching the vehicle. Note that the arrangement aspect in which the directivity is substantially parallel to the horizontal plane of the vehicle includes the aspect in which the plane providing the nondirectionality in the nondirectional antenna is arranged in parallel to the horizontal plane of the vehicle. However, in such an attachment attitude, the sensitivity in the upper direction of the communication terminal outside the vehicle 12 is degraded.
Furthermore, in the aspect in which the outdoor communication device 12 is disposed inside the door handle, when the portable terminal 90 exists near the window 22 outside the outdoor vehicle, the distance from the portable terminal 90 to the outdoor communication device 12 is Compared with the configuration of the embodiment, the reception intensity is likely to be small.

  In view of the above circumstances, in the second comparison configuration, the vicinity of the window portion tends to be an out-of-sight region for the outdoor communication device 12. In addition, such a tendency becomes remarkable when it has a body shape in which a convex portion 211 is formed between the lower end portion 221 of the window portion 22 and the door handle as shown in FIG. . The convex portion 211 is a portion of the body 21 that protrudes outward in the vehicle width direction (in other words, the outer side of the vehicle compartment) than the communication device outside the vehicle compartment 12.

  As a result, when the portable terminal 90 exists in the vicinity of the window 22 outside the vehicle, in the second comparison configuration, the strength outside the vehicle tends to be relatively low. Therefore, when the portable terminal 90 exists near the window 22 outside the vehicle, there is a relatively high possibility that the magnitude relationship between the strength outside the vehicle and the strength inside the vehicle is reversed, and the portable terminal 90 exists outside the vehicle Regardless, if it is present in the vehicle cabin, the risk of an erroneous determination increases.

  On the other hand, in the present embodiment, the outdoor communication device 12 is disposed in the vicinity of the window frame, that is, along the path of the radio wave from the outdoor to the passenger compartment, and therefore the outdoor strength may be lower than that in the passenger compartment. Is smaller than the second comparison configuration, which can reduce the possibility of erroneous determination of the position of the portable terminal 90. Further, in the second comparison configuration, the line-of-sight region for the communication terminal outside the vehicle compartment is susceptible to the body shape, while in the present embodiment, it is not as affected by the body shape of the vehicle Hv as the second comparison configuration. Therefore, this embodiment can be said to be suitable for application to various vehicle models.

  Further, in the configuration in which the outside communication device 12 is provided on the door handle, when the user puts the hand on the door handle, the signal from the portable terminal 90 is attenuated by the user's hand, and the strength outside the vehicle further deteriorates. There is a risk of On the other hand, in the configuration of the present embodiment, even when the user puts his hand on the door handle, there is no possibility that the signal from the portable terminal 90 is attenuated by the user's hand. Therefore, it can be said that the present embodiment is suitable also in a configuration in which the position of the portable terminal 90 is estimated by using the touch sensor 14 as a trigger to detect that the user is touching the door handle.

  The embodiment of the present disclosure has been described above, but the present disclosure is not limited to the above-described embodiment, and various modifications described below are also included in the technical scope of the present disclosure. Also, various modifications can be made without departing from the scope of the invention. For example, various modifications described below can be implemented in combination as appropriate as long as technical contradiction does not occur.

  In addition, about the member which has the function same as the member described in the above-mentioned embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. In addition, when only a part of the configuration is mentioned, the configuration of the embodiment described above can be applied to the other parts.

[Modification 1]
Although the aspect which arrange | positions the communication terminal 12 outside the vehicle in the middle step part of B pillar 24B was disclosed in embodiment mentioned above, it does not restrict to this. The mounting position of the outdoor communication device 12 may be the lower portion or the upper portion of the B-pillar 24B. The lower part of the B-pillar 24B corresponds to the lower part of the three sections obtained by dividing the B-pillar 24B into three equal parts in the vehicle height direction. The upper portion of the B-pillar 24B corresponds to a portion located on the upper side among three sections obtained by dividing the B-pillar 24B into three equal parts in the vehicle height direction.

  Further, the mounting position of the outdoor communication device 12 may be the A pillar 24A as shown in FIG. The specific installation position of the outdoor communication device 12 in the A-pillar 24A is preferably the middle part, but may be the lower part or the upper part. Furthermore, the mounting position of the outdoor communication device 12 may be the C pillar 24C. In addition, the in-vehicle communication device 12 may be disposed in a plurality of pillars such as the A pillar 24A and the B pillar 24B, and the A pillar 24A and the C pillar 24C. The various pillars correspond to members present in a predetermined area which can be regarded as the vicinity of the window 22 of the vehicle Hv on the outer surface of the vehicle Hv.

[Modification 2]
Of the end portions of the roof portion 23, the mounting position of the communication terminal 12 outside the vehicle is at the left roof end portion 231 which is the end portion on the left side of the vehicle and at the end portion on the right side of the vehicle. It may be disposed at each of the right side roof end 232.

  The left roof end portion 231 is a region corresponding to the boundary between the roof portion 23 and the left side surface portion of the vehicle Hv. The left roof end portion 231 corresponds to the left side surface portion of the roof portion 23. Further, according to another viewpoint, the left roof end portion 231 corresponds to a portion in contact with the upper end portion of the door provided on the left side of the vehicle Hv. Furthermore, the left roof end portion 231 corresponds to a portion located on the upper side of the window portion 22 provided on the left side of the vehicle Hv in the side surface portion on the left side of the vehicle Hv.

  The right roof end 232 is an area corresponding to the boundary between the roof 23 and the right side of the vehicle Hv. The right roof end 232 corresponds to the right side portion of the roof 23. Further, according to another viewpoint, the right side roof end portion 232 corresponds to a portion in contact with the upper end portion of the door provided on the right side of the vehicle Hv. Further, the right roof end 232 corresponds to a portion located on the upper side of the window 22 provided on the right side of the vehicle Hv in the side surface on the right side of the vehicle Hv.

  That is, the outdoor communication device 12 may be disposed in a region corresponding to the boundary between the roof portion 23 and the side surface portion. In such an embodiment, when a nondirectional antenna is employed as the outdoor antenna 121, the outdoor communication device 12 arranges the metal member in the region corresponding to the boundary between the roof portion 23 and the side surface portion. It is preferable to arrange | position to the vehicle compartment outer side of the part which is being carried out. Moreover, when arranging the communication terminal 12 outside the vehicle at the above-mentioned position, it is preferable that the center of directivity be attached in a posture of facing several degrees to 30 degrees downward from the horizontal plane of the vehicle.

  According to the above configuration, the same effect as that of the above-described embodiment can be obtained. In the outer surface of the vehicle Hv, the distance between the left roof end 231 and the right roof end 232 from the upper end of the window 22 can be considered to be a predetermined distance near the window 22. It corresponds to the part that falls within. The distance that can be regarded as the vicinity of the window 22 may be appropriately designed, and is set to, for example, 10 cm. Further, the distance that can be regarded as the vicinity of the window 22 may be set to, for example, about 1 time of the wavelength of the system use radio wave. If a 2.4 GHz band radio wave is temporarily adopted as a system use radio wave, the wavelength of the 2.4 GHz radio wave is about 12.5 cm, so the distance which can be regarded as the vicinity of the window 22 is 12.5 cm. It may be set. Of course, the distance that can be regarded as the vicinity of the window 22 may be 5 cm or the like.

[Modification 3]
In the above-described embodiment and various modifications, metal is further added to the region (hereinafter, the region near the window) where the distance from the window 22 is within a predetermined distance that can be regarded as the vicinity of the window 22. Although the outdoor communication device 12 is disposed outside the passenger compartment of the portion where the members are disposed, the present invention is not limited to this.

  If the outdoor antenna 121 is a directional antenna, it may be disposed in the vicinity of the window in a posture in which the center of the directivity of the outdoor antenna 121 is directed to the outdoor as shown in FIG. The material of the portion to which the communication device 12 is attached may not be metal. According to such a configuration, even if the C-pillar 24C is made of resin, it can be adopted as a mounting destination of the outdoor communication device 12. FIG. 18 is a diagram conceptually showing the mounting attitude and directivity of the outdoor communication device 12 to the C-pillar 24C, and is a view when the C-pillar 24C and the like are viewed from above the vehicle Hv. The ellipse of the dashed-dotted line in FIG. 18 represents the directivity of the outdoor communication device 12, and the arrow of the dashed-dotted line indicates the center of directivity. The area near the window corresponds to a predetermined area that can be regarded as the vicinity of the window 22 on the outer surface of the vehicle Hv.

[Modification 4]
As mentioned above, although the aspect which provides the communication terminals 12 out of the vehicles outside a side window, such as a pillar, was indicated, it does not restrict to this. It may be provided near the front window or near the rear window.

DESCRIPTION OF SYMBOLS 10 in-vehicle system, 11 authentication ECU, 12 * 12A * 12B out-of-vehicle communication device, 121 in-vehicle communication device, 122 transmitting / receiving unit, 123 intensity detection unit, 13 in-vehicle communication device, 131 in-vehicle antenna, 132 transmitting / receiving unit, 133 intensity Detecting part, 21 body, 22 window part, 23 roof part, 24A A pillar, 24B B pillar, 24C C pillar, 90 portable terminal, 211 convex part, 221 lower end, 231 left roof end, 232 right roof end Unit, F5 Position determination unit, F6 Vehicle control unit

Claims (9)

A position determination system for a vehicle, which estimates a position of the portable terminal by receiving a radio signal transmitted from a portable terminal carried by a user using radio waves of a predetermined frequency band,
A vehicle interior receiving unit (132) for receiving the wireless signal transmitted from the portable terminal via a vehicle interior antenna installed in a vehicle cabin of the vehicle;
A vehicle interior strength detection unit (133) for detecting the reception strength of the wireless signal received by the vehicle interior reception unit as a vehicle interior strength;
An exterior antenna (121) for receiving the radio signal coming from the exterior of the vehicle;
An outdoor reception unit (122) for receiving the wireless signal transmitted from the portable terminal via the outdoor antenna;
An outdoor intensity detection unit (123) for detecting the reception intensity of the wireless signal received by the outdoor reception unit as the outdoor intensity;
A position determination unit that determines whether the portable terminal is present outside the vehicle based on the vehicle interior strength detected by the vehicle interior strength detection unit and the vehicle exterior strength detected by the vehicle exterior strength detection unit ( F5), and,
The position determination system for a vehicle, wherein the outdoor antenna is disposed in a predetermined area that can be regarded as a vicinity of a window provided in the vehicle on an outer surface of the vehicle. The vehicle position determination system according to claim 1, wherein
The position determination system for a vehicle, wherein the outdoor antenna is disposed in a posture in which the wireless signal from the portable terminal existing outside the vehicle can be received in a pillar of the vehicle. The vehicle position determination system according to claim 1, wherein
The outdoor antenna is configured to receive the wireless signal from the portable terminal outside the vehicle in a portion where the distance from the upper end of the window is within a predetermined distance that can be regarded as the vicinity of the window. A position determination system for a vehicle arranged in a receivable attitude. The vehicle position determination system according to any one of claims 1 to 3, wherein
The position determination system for a vehicle, wherein the in-vehicle antenna is disposed at a position lower than a lower end of the window portion. The position determination system for a vehicle according to any one of claims 1 to 4, wherein
The position outside the passenger compartment of the portion where the metal member is disposed in the predetermined area which can be regarded as the vicinity of the window portion in the side surface portion of the vehicle. Judgment system. The position determination system for a vehicle according to any one of claims 1 to 4, wherein
The vehicle exterior antenna is an antenna having directivity, and the position determination system for a vehicle is disposed in a posture in which the center of directivity is directed to the exterior of the vehicle. A position determination system for a vehicle according to any one of claims 1 to 6, wherein
The position determination unit determines that the portable terminal is outside the vehicle when the outdoor strength detected by the outdoor strength detection unit is higher than the indoor strength detected by the indoor strength detection unit. A position determination system for a vehicle configured to determine that. The position determination system for a vehicle according to any one of claims 1 to 7, wherein
The frequency of the wireless signal is 1 GHz or higher,
The position determination system for a vehicle, wherein the predetermined area is set to an area in which a distance from the window is equal to or less than one time of a wavelength of the radio wave. A position determination system for a vehicle according to any one of claims 1 to 8, wherein
The vehicle control unit (F6) performs at least one of unlocking of a door provided on the vehicle, locking of the door, and starting of a drive source of the vehicle based on the determination result of the position determination unit. Position determination system for vehicles.

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