JP4066956B2 - Vehicle detection device for vehicles - Google Patents

Description

  The present invention relates to a vehicle human detection device, and more particularly to detecting a person around a vehicle by receiving radio waves emitted from a mobile terminal carried by a person such as a pedestrian or a bicycle occupant in all directions. And a suitable vehicle human detection device.

2. Description of the Related Art Conventionally, there is known a vehicle human detection device including a receiver that receives a transmission signal from a portable device possessed by a pedestrian (see, for example, Patent Document 1). In this pedestrian detection device, when a signal transmitted from the portable device is received by the receiver, the position of the pedestrian relative to the host vehicle is detected based on the received signal, and then the traveling direction of the host vehicle, that is, the steering angle. Whether or not the own vehicle and the pedestrian are in contact with each other is determined based on the distance from the own vehicle to the pedestrian. When there is a high possibility of contact, an alarm is issued to inform the vehicle driver to that effect.
JP 7-306995 A

  However, in the above-described conventional pedestrian detection device, the position of the pedestrian is detected in all directions uniformly with respect to the own vehicle in order to detect a pedestrian with a high possibility of coming into contact with the own vehicle and issue an alarm. In this respect, in such a configuration, a pedestrian who is located in a direction completely different from the traveling direction of the vehicle and has almost no possibility of contact with the vehicle is detected. As a result, the calculation processing load for detecting the error increases, and the calculation takes a long time.

  The present invention has been made in view of the above-described points, and provides a vehicle human detection device capable of efficiently detecting a person such as a pedestrian who has a portable terminal for causing the vehicle to detect a position. The purpose is to provide.

According to the first aspect of the present invention, there is provided a receiving means for receiving radio waves emitted by a portable terminal carried by a person in all directions around a vehicle, and the portable terminal within a predetermined area based on a reception result of the receiving means. A presence detection means for determining whether or not there is a person who owns the terminal, and a vehicle human detection device, more than the reception sensitivity of the reception means in the vehicle traveling direction determined based on the vehicle traveling state , This is achieved by a vehicular human detection device including reception sensitivity setting means for reducing reception sensitivity of the reception means in a direction different from the vehicle traveling direction.

  In the first aspect of the present invention, the reception sensitivity in all directions of the receiving means is set lower in the direction different from the vehicle traveling direction than in the vehicle traveling direction. In such a configuration, it is easy to detect a person located in the vehicle traveling direction, and it is difficult to detect a person located in a direction different from the vehicle traveling direction. In general, a person who interferes with vehicle travel is a person located in the vehicle traveling direction. Therefore, according to the present invention, it is possible to avoid detection of a portable terminal holder located in a direction different from the traveling direction of the vehicle, which hardly needs to be detected, thereby reducing the load on detecting the portable terminal holder. Can be reduced.

In addition, as described in claim 2, the object is to receive a radio wave emitted by a portable terminal held by a person in all directions around the vehicle, and a reception level of the reception unit is a predetermined threshold value or more. A vehicle presence detection means for determining whether or not there is a person carrying the mobile terminal in a predetermined area based on whether or not there is a vehicle person detection device, which is obtained based on a vehicle running state This is achieved by a vehicle human detection device comprising threshold setting means for making the predetermined threshold higher in a direction different from the vehicle traveling direction than the predetermined threshold in the vehicle traveling direction.

  In the invention according to claim 2, among the predetermined threshold values of the omnidirectional reception level of the receiving means for detecting people around the vehicle carrying the portable terminal, those in a direction different from the vehicle traveling direction are the vehicle traveling Set higher than in the direction. In such a configuration, it is easy to detect a person located in the vehicle traveling direction, and it is difficult to detect a person located in a direction different from the vehicle traveling direction. In general, a person who interferes with vehicle travel is a person located in the vehicle traveling direction. Therefore, according to the present invention, it is possible to avoid detection of a portable terminal holder located in a direction different from the traveling direction of the vehicle, which hardly needs to be detected, thereby reducing the load on detecting the portable terminal holder. Can be reduced.

In this case, as described in claim 3, in the vehicle human detection device according to claim 1 or 2, the vehicle traveling direction is a shape, road width, number of lanes, or intersection information indicating a road environment in which the host vehicle travels. if it is determined in consideration of the order in which the vehicle traveling direction is calculated matches the traveling road, it is possible to accurately fit the portable terminal holder of detecting the traveling road.

  According to the first and second aspects of the invention, it is possible to efficiently detect the portable terminal holder by avoiding the detection of the portable terminal holder located in a direction different from the vehicle traveling direction, which hardly needs to be detected. Can do.

  Further, according to the invention described in claim 3, it is possible to accurately detect the portable terminal holder in accordance with the traveling road.

  FIG. 1 is a configuration diagram of a system according to an embodiment of the present invention. Moreover, FIG. 2 shows the system block diagram of the vehicle equipment mounted in a vehicle in a present Example. As shown in FIG. 1, the system of the present embodiment includes an in-vehicle device 10 mounted on a vehicle, and a portable terminal 12 possessed by a pedestrian or a person who rides a light vehicle such as a two-wheel or three-wheel bicycle or motorcycle. , Is composed of. The portable terminal 12 transmits a radio wave having a predetermined frequency to the outside as a transmitter.

  The in-vehicle device 10 detects a person existing around the vehicle by receiving radio waves emitted from the mobile terminal 12, and provides information by an alarm to the vehicle driver when the person exists in a predetermined area. It has a function of notifying the vehicle driver to that effect. That is, the in-vehicle device 10 has an antenna 14 for receiving radio waves emitted from the mobile terminal 12. The antenna 14 is configured so that directivity can be continuously swung around the vehicle. A receiver 16 is connected to the antenna 14. The receiving unit 16 has sensitivity set by a method described later, and receives radio waves received by the antenna 14. A reception level detection unit 18 is connected to the reception unit 16. The reception level detection unit 18 detects the reception level of the radio wave received by the reception unit 16. A direction / distance estimation unit 20 is connected to the reception level detection unit 18. Information on the reception level detected by the reception level detection unit 18 is supplied to the direction / distance estimation unit 20.

  A directivity control unit 22 that controls the directivity of the antenna 14 is connected to the direction / distance estimation unit 20. The direction / distance estimating unit 20 supplies information on the azimuth direction to be received to the vehicle toward the directivity control unit 22. The directivity control unit 22 switches the directivity of the antenna 14 according to the azimuth angle direction supplied from the direction / distance estimation unit 20. When the reception level for all azimuth directions is supplied from the reception level detection unit 18 by switching the directivity of the antenna 14, the direction / distance estimation unit 20 possesses the radio wave arrival direction and distance, that is, the portable terminal 12. Estimate the direction in which the person is present and the distance to that person.

  The direction / distance estimating unit 20 is connected to a receiving unit sensitivity setting unit 24 for setting the receiving sensitivity in the receiving unit 16. Information on the azimuth direction to be received with respect to the vehicle from the direction / distance estimating unit 20 is supplied to the receiving unit sensitivity setting unit 24. The receiver sensitivity setting unit 24 is connected to a pedestrian / bicycle presence information providing area deriving unit 26. The pedestrian / bicycle presence information providing area deriving unit 26 is supplied with information on the speed of the host vehicle (vehicle speed) detected using a vehicle speed sensor and vehicle turn signal information detected using a turn signal indicator. In addition, navigation information such as road shape, road width, lane number information, and intersection information in the vicinity of the current position of the vehicle (especially in the vehicle traveling direction) detected using a navigation system mounted on the vehicle. Supplied. The navigation information is stored in advance in the map database of the navigation system. The pedestrian / bicycle presence information providing area deriving unit 26 derives areas corresponding to these parameters from the supplied vehicle speed, blinker information, and navigation information according to a predetermined calculation formula as will be described in detail later. The derived area information is sent to the receiver sensitivity setting unit 24. Based on the supplied area information, the receiver sensitivity setting unit 24 is the longest for receiving radio waves emitted by the mobile terminal 12 in the azimuth direction to be received by the antenna 14 supplied from the direction / distance estimating unit 20. The detection distance is determined.

  Here, the area derived in the pedestrian / bicycle presence information provision area deriving unit 26 will be described. FIG. 3 is a diagram schematically showing an information providing area derived for providing information set in the present embodiment.

  First, when the vehicle driver receives information from the vehicle-mounted device 10 as the vehicle-mounted device, finds a person who rides a pedestrian or a bicycle, and considers the time from when the brake pedal is depressed to stop the vehicle, this time T Is the time T1 from when the driver receives information until the person is discovered, the idle time T2 from when the driver discovers the person to when the brake is operated, and the vehicle after the brake operation is started Is the total time of braking time T3 until the vehicle actually stops. Next, consider the moving distance of the vehicle at time T from when the provision of information to the vehicle driver is started until the vehicle is braked.

  For example, assuming that T1 = 3 seconds and T2 = 1 seconds are satisfied, when the vehicle travels at 60 km / h, the vehicle moves about 67 meters during (T1 + T2). The braking distance of the vehicle from 60 km / h is about 27 meters. Therefore, when the vehicle is traveling at 60 km / h, the moving distance of the vehicle is about 94 meters. That is, when a pedestrian or bicycle appears on the traveling road when the vehicle is traveling at 60 km / h, the vehicle will contact the pedestrian if information is provided about 94 meters before the vehicle. It is possible to stop safely before that. On the other hand, since the person on the road also moves while the vehicle is moving, this moving distance needs to be considered in providing information. The time for the vehicle to travel 94 meters at 60 km / h is about 5.6 seconds, and if the speed of the pedestrian is 5 km / h, the distance that the pedestrian travels in 5.6 seconds Is about 8 meters. Therefore, it is possible to determine that a pedestrian who may contact the vehicle at a point (cross point) 94 meters ahead is a pedestrian walking within a radius of 8 meters from the cross point.

  When the vehicle travels at 30 km / h, the vehicle moves about 33 meters during the above-described (T1 + T2), and the braking distance of the vehicle from 30 km / h is about 6 meters. Therefore, when the vehicle is traveling at 30 km / h, the moving distance of the vehicle is about 39 meters. On the other hand, the time required for the vehicle to move 39 meters at 30 km / h is about 4.7 seconds, and the distance that the pedestrian moves during 4.7 seconds is about 7 meters. Therefore, it is possible to determine that a pedestrian who may contact the vehicle at a cross point 39 meters ahead is a pedestrian walking within a radius of 7 meters from the cross point.

  Therefore, when the vehicle travels at 60 km / h, as shown in FIG. 3 (A), an area from the vehicle to the cross point including a circle with an radius of 8 meters centered on the cross point 94 meters away from the vehicle is shown. Set as an information provision area corresponding to pedestrians. When the vehicle travels at 30 km / h, as shown in FIG. 3 (B), an area from the vehicle to the cross point including a circle with a radius of 7 meters centered on the cross point 39 meters away from the vehicle is shown. Set as an information provision area corresponding to pedestrians. And if there is a pedestrian carrying the portable terminal 12 in the information providing area, if the vehicle driver is informed of the possibility that the vehicle may come into contact with the pedestrian, It becomes possible to prevent contact with people.

  Next, consider the case where the winker is activated in the vehicle. For example, when the right turn signal is operated, it can be determined that the vehicle turns right or changes to the right lane. For example, in a situation where the lane change is performed while the vehicle is traveling at 40 km / h, the moving distance of the vehicle is about 55 meters. The distance that the pedestrian moves while the vehicle moves 55 meters at 40 km / h is about 7 meters. Therefore, it is possible to determine that a pedestrian who may contact the vehicle at a cross point 55 meters ahead is a pedestrian walking within a radius of 7 meters from the cross point. On the other hand, in the situation where the vehicle is traveling at 40 km / h and decelerated to 30 km / h at a deceleration of 0.19 G and turns right or left, the vehicle decelerates to 30 km / h and starts turning right and left If the time is 1.5 seconds and the distance traveled is 15 meters, the vehicle will move approximately 21 meters during the total time of the remaining 1.5 seconds of time T1 and idle time T2, and 30 km. The braking distance from / h is about 6 meters. Therefore, in such a situation, the moving distance of the above-described vehicle on the assumed traveling locus is about 42 meters. On the other hand, the distance that the pedestrian moves while the vehicle moves 42 meters at 30 km / h is about 7 meters. Therefore, it is possible to determine that a pedestrian who is likely to come into contact with the vehicle at a cross point 42 meters ahead on the travel locus is a pedestrian walking within a radius of 7 meters from the cross point.

  Therefore, when the winker is operated from a state where the vehicle travels at 40 km / h, as shown in FIG. 3 (C), within a circle with a radius of 7 meters centering on a cross point 55 meters ahead in the straight direction from the vehicle. An area from the vehicle to the cross point, and an area from the vehicle to the cross point that includes a circle with a radius of 7 meters centered on a cross point 42 meters ahead on the assumed trajectory in the direction of turning left or right from the vehicle, Is set as an information providing area corresponding to a pedestrian. And if there is a pedestrian carrying the portable terminal 12 in the information providing area, if the vehicle driver is informed of the possibility that the vehicle may come into contact with the pedestrian, It becomes possible to prevent contact with people.

  Next, consider a case where the road on which the vehicle travels is not a straight road but a curved road. Even when the road on which the vehicle is traveling is a straight road at the present time, if the road ahead is a curved road, the possibility that the vehicle will be steered after the curved road is extremely high. Further, when the vehicle is positioned in the right turn lane or the left turn lane on the lane with the blinker activated, it can be determined that the vehicle turns right or left instead of changing the lane.

  Therefore, in setting the information providing area, first, the traveling locus of the host vehicle is predicted based on the road shape as the navigation information. In addition, when a vehicle enters an intersection, it reads information on the lane (such as a right turn lane) that the host vehicle is driving based on navigation information such as the shape of the intersection and the number of lanes, and based on the lane information and turn signal information. To predict the travel trajectory of the vehicle. Then, after setting the cross point described above at a position away from the vehicle along the expected travel locus by a predetermined distance, the information providing area is set according to the method described above.

  For example, as shown in FIG. 3D, when the predicted traveling locus of the vehicle is a right curve road, at a speed of 60 km / h, the radius is 8 meters centered on a cross point 94 meters ahead on the predicted traveling locus from the vehicle. The area from the vehicle including the circle to the cross point is set as an information providing area corresponding to the pedestrian. If the vehicle is located in the right turn lane at the intersection and the right turn signal is activated, the cross point that is a predetermined distance away from the right turn lane and passing through the vicinity of the intersection center to the intersection road. An area from the vehicle including the inside of a circle with a predetermined radius centered on the vehicle to the cross point is set as the information providing area. And if there is a pedestrian carrying the portable terminal 12 in the information providing area, if the vehicle driver is informed of the possibility that the vehicle may come into contact with the pedestrian, It becomes possible to prevent contact with people.

  In setting the information provision area, it is actually necessary to consider the total length and width of the vehicle and the passing distance between the vehicle and the person. Therefore, the area where these distances are secured is the information provision area. Is set.

  As described above, in the present embodiment, the position and size of the information providing area for determining whether or not there is a person carrying the mobile terminal 12 for providing information to the vehicle driver is the vehicle The vehicle speed and turn signal information, the road environment based on the navigation information, and the person's movement (specifically, movement speed) are set. In this case, an information provision area is set in consideration of the vehicle speed and blinker information as the driving state of the vehicle, the environment such as the predicted driving trajectory and the shape of the intersection, and the human movement in advance. The person who has a high possibility of contact with the vehicle is detected as the target, that is, the person with a low possibility of contact with the vehicle is excluded from the target, and the timing of providing information to the vehicle driver is delayed or can be contacted It is possible to avoid the provision of information due to a pedestrian or the like located in a place where there is no possibility, and thereby it is possible to provide information to the vehicle driver with high accuracy.

  FIG. 4 is a diagram showing the relationship between the longest detection distance for receiving radio waves emitted from the mobile terminal 12 and the reception sensitivity of the receiving unit 16. As shown in FIG. 4, in order to increase the longest detection distance at which the receiving unit 16 of the vehicle receives radio waves emitted from the mobile terminal 12, it is necessary to increase the reception sensitivity and to shorten the longest detection distance. Therefore, the reception sensitivity may be lowered. That is, when the reception sensitivity is increased when the antenna 14 is directed in a certain direction, the longest detection distance in that direction becomes long, and when the reception sensitivity is lowered, the longest detection distance in that direction becomes short.

  As shown in FIG. 2, a receiver sensitivity-detection distance characteristic table 28 is connected to the receiver sensitivity setting unit 24. The receiver sensitivity-detection distance characteristic table 28 stores the sensitivity of the receiver 16 to be realized with respect to the longest detection distance for detecting the mobile terminal 12 as shown in FIG. The receiver sensitivity setting unit 24 determines the sensitivity in the azimuth direction of the receiver 16 by determining the longest detection distance in the azimuth angle direction of the antenna 14 and then referring to the receiver sensitivity-detection distance characteristic table 28. To do. The reception unit sensitivity setting unit 24 sets the sensitivity in the azimuth direction every time information of the azimuth direction to be received by the antenna 14 is supplied from the direction / distance estimation unit 20, and the sensitivity information is set in the reception unit 16. To supply. The receiving unit 16 receives radio waves from the azimuth direction to be received by the antenna 14 with the sensitivity according to the sensitivity information supplied from the receiving unit sensitivity setting unit 24.

  The direction / distance estimating unit 20 is also connected to an information providing unit 30 that provides information visually or audibly to the driver of the host vehicle using a display or a speaker. The information providing unit 30 is supplied with information on the direction in which the person holding the mobile terminal 12 exists and the distance to the person estimated by the direction / distance estimating unit 20. When the information providing unit 30 is supplied with information on a person who holds the mobile terminal 12 from the direction / distance estimating unit 20, the information providing unit 30 outputs a voice or, for example, by operating the display or the speaker, or displays the information of the person on the navigation map. By displaying the position, the vehicle driver is informed that the vehicle may contact the person.

  As described above, according to the system of the present embodiment, when the person holding the portable terminal 12 that emits radio waves is present in the predetermined area for the vehicle, the own vehicle may come into contact with the vehicle driver. When the vehicle driver receives information from the in-vehicle device 10, the vehicle driver can pay attention to where the pedestrian or the bicycle is, and as a result, It is possible to prevent human contact accidents.

  Next, a characteristic configuration and operation of this embodiment will be described. FIG. 5 is a diagram for explaining the characteristic configuration and operation of this embodiment. 5 shows a top view in which the traveling direction of the vehicle is an azimuth angle of 0 ° and the opposite direction to the traveling direction is an azimuth angle of ± 180 °. FIG. 6 is a diagram showing detection threshold values for reception levels in all azimuth directions set by the receiver sensitivity setting unit 24 of this embodiment.

  As described above, in the system of this embodiment, the pedestrian / bicycle presence information providing area deriving unit 26 provides an information providing area for notifying the vehicle driver that there is a person on the road on which the vehicle is traveling. Is derived. This information provision area is set according to the vehicle traveling direction based on the vehicle speed, road shape, and the like of the vehicle. On the other hand, the antenna 14 of the in-vehicle device 10 catches radio waves from the portable terminal 12 possessed by a person existing around the vehicle by continuously oscillating the directivity around the vehicle. However, at this time, if the antenna 14 catches radio waves uniformly in all azimuth directions, the information provided by the vehicle-mounted device 10 desired by the vehicle driver exists at the end of the road on which the vehicle travels. Pedestrians, etc., which are located in a direction completely different from the traveling direction of the vehicle and have little possibility of contact with the vehicle in spite of the information of the person who performs the operation, can be detected. The calculation processing load for detecting a high-performance pedestrian increases, and the calculation requires a lot of time.

  For example, as shown in FIG. 5, there are three people who have the portable terminal 12, and those who have the portable terminal 12a are located in the information providing area, while those who have the portable terminals 12b and 12c provide information. In a situation where the vehicle driver is not located in the area, the vehicle driver desires to provide information related to the person who owns the mobile terminal 12a, but rarely desires to provide information related to the person who owns the mobile terminals 12b and 12c. In this regard, if it is determined whether or not the person is located in the information providing area after detecting all the persons located around the vehicle, useless calculation processing is performed.

  Therefore, in the system of the present embodiment, the receiving sensitivity of the receiving unit 16 is different from that in the vehicle traveling direction and in the direction different from the vehicle traveling direction. Specifically, the reception sensitivity in a direction different from that in the vehicle traveling direction is lowered, and the threshold in a direction different from that direction is made higher than the threshold of the reception level in the vehicle traveling direction.

  As described above, the receiving unit sensitivity setting unit 24 is supplied with information on the azimuth direction to be received with respect to the vehicle from the direction / distance estimating unit 20, and also the pedestrian / bicycle presence information providing area deriving unit 26. Information of the information providing area from is supplied. Every time information on the azimuth direction to be received by the antenna 14 is supplied from the direction / distance estimation unit 20, the reception unit sensitivity setting unit 24 converts the supplied information providing area information and information on the azimuth direction. Based on this, after determining the longest detection distance for receiving radio waves emitted by the mobile terminal 12 in the azimuth direction to be received by the antenna 14, the reception sensitivity of the receiving unit 16 in the azimuth direction is set. For example, when the information provision area is set to be directed to the azimuth angle + 30 ° direction as shown in FIG. 5, the reception sensitivity in the azimuth angle + 30 ° direction is set to the highest as shown in FIG. The reception level threshold is set to the lowest level, and the reception sensitivity in directions other than the azimuth angle + 30 ° is set to gradually decrease from the maximum sensitivity as the distance from the azimuth angle + 30 ° increases (that is, the reception level is reduced). Set the threshold to gradually increase).

  FIG. 7 shows a flowchart of an example of a control routine executed by the receiving unit sensitivity setting unit 24 in the in-vehicle device 10 of this embodiment in order to set the receiving sensitivity of the receiving unit 16. The routine shown in FIG. 7 is a routine that is repeatedly activated every predetermined time. When the routine shown in FIG. 7 is started, first, the process of step 100 is executed.

  In step 100, a process of acquiring information on the information provision area derived by the pedestrian / bicycle presence information provision area deriving unit 26 is executed. In step 102, processing for acquiring information on the azimuth direction to be received by the vehicle antenna 14 next set in the direction / distance estimating unit 20 is executed. In step 104, a process of determining the longest detection distance of the information providing area in the azimuth direction based on the information in the information provision area and the information in the azimuth direction acquired in steps 100 and 102 is executed. .

  In step 106, processing for determining the reception sensitivity of the reception unit 16 corresponding to the longest detection distance determined in step 104 is executed by referring to the reception unit sensitivity-detection distance characteristic table 28. In step 108, a process for instructing the receiving unit 16 to realize the reception sensitivity determined in step 106 is executed. After the processing of step 108 is executed, the receiving unit 16 thereafter receives radio waves emitted from the mobile terminal 12 from the azimuth angle direction to be received by the antenna 14 with sensitivity according to the set information providing area. When the processing of step 108 is completed, the current routine is terminated.

  According to the routine shown in FIG. 7 described above, according to the information providing area in which the region extends relatively long in the vehicle traveling direction in consideration of the vehicle traveling state such as the vehicle speed and the turn signal information and the road environment such as the road shape. The reception sensitivities in the respective azimuth directions can be made different from each other. Specifically, the reception sensitivity in the vehicle traveling direction can be made relatively high, and the reception sensitivity in a direction different from the vehicle traveling direction can be made relatively low.

  The information to be provided from the in-vehicle device 10 desired by the vehicle driver is information on a person existing ahead of the road on which the host vehicle travels as described above, and information on a person existing in a direction completely different from the traveling direction of the vehicle. Although it is not necessary to detect, in the above-described configuration, the receiving unit 16 can easily detect a person located in the vehicle traveling direction, whereas it is difficult to detect a person located in a direction different from the vehicle traveling direction. . For example, in the situation shown in FIG. 5, the reception level of the radio wave transmitted from the portable terminal 12c possessed by a person located in the direction completely opposite to the vehicle traveling direction cannot exceed a relatively high threshold, and the vehicle Since the reception level of the radio wave transmitted from the portable terminal 12b possessed by the person closest to the vehicle in a direction different from the traveling direction is relatively high, it cannot exceed the relatively high threshold value. While the owners of 12b and 12c cannot be detected, the reception level of radio waves transmitted from the portable terminal 12a possessed by a person located in the information provision area is absolutely smaller than that of the portable terminal 12b. Since the relatively low threshold can be exceeded, the owner of the mobile terminal 12a can be detected.

  As described above, in the system of the present embodiment, the portable terminal owner who is located in a direction different from the traveling direction of the vehicle, which hardly needs to be detected in detecting the person who has the portable terminal existing in the information providing area. It is not necessary to detect whether or not the person is in the information provision area after detecting all the people around the vehicle, and there is a person in the information provision area from the beginning. It is possible to determine whether or not to do so. Therefore, according to the system of the present embodiment, the processing load for detecting the portable terminal holder is reduced by avoiding the detection of the portable terminal holder located in a direction different from the traveling direction of the vehicle that hardly needs to be detected. Therefore, it is possible to efficiently detect the portable terminal holder.

  Further, in the system of the present embodiment, the information providing area that is indispensable for setting the receiving sensitivity of the receiving unit 16 in each azimuth angle direction is the vehicle environment such as the vehicle speed and the turn signal information, and the road environment such as the road shape. Considering this, the region is set to extend relatively long in the vehicle traveling direction. That is, the setting of the vehicle traveling direction in the information providing area takes into account not only the traveling state of the vehicle but also the road environment in which the vehicle travels. Accordingly, the vehicle traveling direction that greatly affects the setting of the reception sensitivity matches the traveling road, and the reception sensitivity corresponding to the traveling road is set. Therefore, the detection of the person holding the mobile terminal 12 is detected. It is possible to perform accurately according to the road.

  In the above-described embodiment, the antenna 14, the receiving unit 16, and the reception level detecting unit 18 correspond to the “receiving means” recited in the claims, and the direction / distance estimating unit 20 includes the reception level. Based on the reception level information supplied from the detection unit 18, it is determined whether or not there is a person who has the mobile terminal 12 in the information providing area. The “reception sensitivity setting means” and “threshold value setting means” described in the claims are realized by the reception unit sensitivity setting unit 24 executing the processing of steps 100 to 108 in the routine shown in FIG. Has been.

  By the way, in the above-described embodiment, the vehicle speed and the blinker information are used as the vehicle parameters when setting the information providing area, but a traveling state such as a yaw rate may be used. In this case, if the information providing area corresponding to the yaw rate is set, the information providing area is set according to the shape of the road on which the vehicle is traveling. Can be performed.

  In the above embodiment, the road environment such as the road shape and the number of lanes is acquired based on the navigation information sent from the navigation system. It is good also as acquiring based on communication data.

  In the above embodiment, the antenna 14 is an antenna capable of continuously oscillating directivity around the vehicle, but may be an antenna capable of switching directivity in a plurality of azimuth directions.

  That is, FIG. 8 is a diagram showing detection threshold values for reception levels in all azimuth directions set when the antenna has directivity in eight directions in the modification of the present invention. In the configuration in which the antenna 14 has directivity in eight directions, the directivity of the antenna 14 is switched by 45 °, and the receiving unit 16 is different in each azimuth direction divided into eight according to the set information providing area. It has reception sensitivity. For example, in the situation shown in FIG. 5, an antenna in which radio waves from a portable terminal 12a possessed by a person located in the information provision area are directed in the direction of azimuth + 30 ° where reception sensitivity is high and detection threshold is low. 14, the radio waves from the other mobile terminals 12 b and 12 c are not received by the antenna 14 that is directed in any direction, so that only persons located in the information providing area are detected as information providing targets. It becomes.

  Further, in the above embodiment, the moving speed of the pedestrian is assumed as the moving speed of the person considered in setting the information providing area, but the present invention is not limited to this, It is good also as assuming the moving speed (for example, 15 km / h etc.) of the person who gets on light vehicles, such as a motorcycle. Further, in this case, both the information providing area corresponding to the pedestrian and the information providing area corresponding to the light vehicle occupant may be set as separate information providing areas. In setting both information provision areas in this way, the portable terminal 12 held by the person transmits different radio waves (for example, radio waves with different frequencies or radio waves with different ID codes) between the pedestrian and the light vehicle. In addition, the receiving unit 16 of the in-vehicle device 10 needs to determine the type of person (the pedestrian and the light vehicle occupant) who owns the mobile terminal 12 from the radio wave of the mobile terminal 12. As described above, if the information providing area is set to be distinguished from the pedestrian area corresponding to the pedestrian moving speed and the bicycle area corresponding to the bicycle moving speed, the moving speed is set. Pedestrians and bicycles with different qualities will be detected separately and people with high possibility of contact with the vehicle will be detected as targets, and this will also provide accurate information to the vehicle driver Is possible. In such a configuration, the radio wave transmitted by the mobile terminal 12 may be switched between a radio wave for a pedestrian and a radio wave for a light vehicle by a switching operation of a possessed person, and corresponds to a light vehicle. The portable terminal 12 may be attached to a light vehicle without the passenger's possession and transmit radio waves for the light vehicle. Moreover, it is good also as displaying the position of the person who has the portable terminal 12 by distinguishing with a pedestrian and a bicycle passenger on the map projected on the vehicle-mounted display of a navigation system as information provision with respect to a vehicle driver.

It is a block diagram of the system which is one Example of this invention. 1 is a system configuration diagram of an in-vehicle device mounted on a vehicle in the present embodiment. It is the figure which represented typically the information provision area derived | led-out in order to perform the information provision set in a present Example. It is a figure showing the relationship between the longest detection distance for receiving the electromagnetic wave which a portable terminal emits, and the receiving sensitivity of a receiving part. It is a figure for demonstrating the characteristic structure and operation | movement of a present Example. It is a figure showing the detection threshold value of the reception level in the omnidirectional direction set in a present Example. It is a flowchart of the control routine performed in a present Example. It is a figure showing the detection threshold value of the reception level in all the azimuth directions set in the modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Onboard equipment 12 Portable terminal 16 Receiving part 24 Receiving part sensitivity setting part 26 Pedestrian / bicycle presence information provision area deriving part 28 Receiving part sensitivity-detection distance characteristic table

Claims (3)

A receiving means for receiving radio waves emitted from a portable terminal carried by a person in all directions around the vehicle, and determining whether or not there is a person carrying the portable terminal in a predetermined area based on a reception result of the receiving means Vehicle presence detection means comprising:
A vehicle person, comprising: a reception sensitivity setting unit that lowers the reception sensitivity of the reception unit in a direction different from the vehicle travel direction, rather than the reception sensitivity of the reception unit in the vehicle travel direction determined based on a vehicle traveling state. Detection device. Receiving means for receiving radio waves emitted by a portable terminal carried by a person in all directions around the vehicle; and determining whether or not the reception level of the receiving means is equal to or higher than a predetermined threshold value to place the portable terminal in a predetermined area. A vehicle person detection device comprising presence determination means for determining whether or not a person is possessed,
A vehicle person comprising threshold setting means for making the predetermined threshold value in a direction different from the vehicle traveling direction higher than the predetermined threshold value in the vehicle traveling direction obtained based on a vehicle traveling state. Detection device. 3. The vehicle human detection device according to claim 1, wherein the vehicle traveling direction is obtained in consideration of a shape indicating a road environment in which the host vehicle travels , a road width, the number of lanes, or intersection information .