JP2017117148A - Another vehicle approach warning system, method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that can warn a driver who seems not to be careful.SOLUTION: Another vehicle approach warning system includes: an approach detection unit, that detects another vehicle approaching an own vehicle at an intersection; a traffic flow acquisition unit, that acquires the traffic flow at the intersection; and a warning control unit, that controls a warning device so that approach of the another vehicle is detected when the approach has been detected and the traffic flow at the intersection is not larger than a first threshold value and that a driver is warned more strongly than when the traffic flow at the intersection is larger than the first threshold value.SELECTED DRAWING: Figure 3

Description

  The present invention relates to another vehicle approach warning system, method, and program.

  There is known a technique for giving a warning or a warning when a vehicle approaches a traffic warning area (see Patent Document 1). According to Patent Document 1, even a driver who does not know the road can pass through an area requiring traffic warning with care.

JP 2002-181564 A

However, even when passing through the same traffic warning required area, there are cases where the driver goes through with caution and where the driver pays attention. And when a warning was originally given in a situation where the driver was paying attention, there was a problem that the driver felt annoyed.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique capable of giving a warning in accordance with the possibility that the driver is out of alert.

  In order to achieve the above object, another vehicle approach warning system of the present invention includes an approach detection unit that detects the approach of another vehicle to the host vehicle at an intersection, a traffic volume acquisition unit that acquires the traffic volume of the intersection, and the like. When the approach of the vehicle is detected and the traffic volume at the intersection is less than or equal to the first threshold, the driver is emphasized more than when the approach of another vehicle is detected and the traffic volume at the intersection is greater than the first threshold. A warning control unit that controls the warning device so as to warn.

  In order to achieve the above object, another vehicle approach warning method of the present invention includes an approach detection step for detecting an approach of another vehicle to the host vehicle at an intersection, a traffic volume acquisition step for acquiring the traffic volume at the intersection, and the like. When the approach of the vehicle is detected and the traffic volume at the intersection is less than or equal to the first threshold, the driver is emphasized more than when the approach of another vehicle is detected and the traffic volume at the intersection is greater than the first threshold. A warning control step of controlling the warning device so as to warn.

  In order to achieve the above object, the other vehicle approach warning program of the present invention includes an approach detection function for detecting the approach of the other vehicle to the own vehicle at the intersection, a traffic volume acquisition function for acquiring the traffic volume at the intersection, and the like. When the approach of the vehicle is detected and the traffic volume at the intersection is less than or equal to the first threshold, the driver is emphasized more than when the approach of another vehicle is detected and the traffic volume at the intersection is greater than the first threshold. And a warning control function for controlling the warning device so as to warn the computer.

  In the configuration of the present invention described above, a warning can be given by emphasizing at an intersection with a small traffic volume that is easy for the driver to be alert. On the other hand, it is possible to suppress excessive warnings at intersections where there is a large amount of traffic where the driver is likely to pay attention.

It is a block diagram of another vehicle approach warning system. It is a top view of an intersection. It is a flowchart of another vehicle approach warning process.

Here, embodiments of the present invention will be described in the following order.
(1) Configuration of navigation device:
(2) Other vehicle approach warning processing:
(3) Other embodiments:

(1) Configuration of navigation device:
FIG. 1 is a block diagram showing a configuration of a navigation device 10 as another vehicle approach warning system. The navigation device 10 is a vehicle-mounted device mounted on the host vehicle J. The navigation device 10 includes a control unit 20 including a CPU, a RAM, a ROM, and the like, and a recording medium 30, and the control unit 20 executes the other vehicle approach warning program 21 stored in the recording medium 30 and the ROM.

  The recording medium 30 records map information 30a and history information 30b. The map information 30a includes link data for specifying a link connecting two nodes, node data indicating the node, and the like. The link means a road section where the vehicle can travel. A node is a start point or an end point of a link, and a node to which three or more links are connected means an intersection. The node data includes data indicating the presence / absence of a signal for each node. The link data includes shape interpolation point data indicating the position of the shape interpolation point set at a position other than the node on the link, and data indicating the width of the link and the number of lanes.

  The history information 30b is data in which the trajectory of the current location of the host vehicle J is accumulated, and the control unit 20 can acquire the traffic frequency of each link by analyzing the trajectory. The traffic frequency is the number of times the host vehicle J has passed the link per unit period (for example, one month). The traffic frequency may be the cumulative number of times the host vehicle J has passed the link, or an index value that increases as the period from the last time the host vehicle J passed the link to the current time decreases. There may be. Further, when a plurality of drivers drive the host vehicle J, the traffic frequency is the locus of the current location when the same driver as the driver currently driving the host vehicle J has driven the host vehicle J in the past. May be obtained based on

  The host vehicle J includes an inter-vehicle communication unit 41, a communication unit 42, a warning device 43, and a position sensor 44. The inter-vehicle communication unit 41 is configured by, for example, a circuit that transmits and receives radio waves and an antenna, and can communicate with another vehicle T within a communication range in which the radio waves can reach (for example, within a circular range with a radius of 300 m). The other vehicle T is similarly provided with a circuit and an antenna for inter-vehicle communication. The communication unit 42 is a circuit for performing wireless communication with the server 100, for example, a circuit connected to the server 100 via a mobile phone communication network. The server 100 statistically processes the traffic volume for each link, and distributes traffic information indicating the traffic volume for each link to the host vehicle J. The server 100 may calculate the traffic volume for each link by statistically processing the probe information transmitted from a large number of vehicles, or statistically process the information transmitted from the vehicle detector installed on the road. Thus, the traffic volume may be calculated for each link. In the present embodiment, the traffic volume is an average number of vehicles passing per unit time (for example, 1 minute). In addition, the traffic volume may be statistically processed for each time zone, day of the week, or weekday.

  The warning device 43 includes a display as a video output device and a speaker as an audio output device. The position sensor 44 is a GPS receiver, a vehicle speed sensor, a gyro sensor, or the like, and outputs a signal for calculating the current location of the host vehicle J to the navigation device 10. Note that the navigation device 10 may specify the current location of the host vehicle J by performing known map matching using a signal from the position sensor 44. The inter-vehicle communication unit 41 periodically transmits and receives data indicating the current location of the host vehicle J and the other vehicle T. Therefore, the control unit 20 can monitor the current location of the other vehicle T existing within the communication range of the host vehicle J.

The other vehicle approach warning program 21 includes an approach detection module 21a, a traffic volume acquisition module 21b, and a warning control module 21c.
The approach detection module 21a is a program module that causes the control unit 20 to realize the function of detecting the approach of the other vehicle T to the host vehicle J at the intersection.

FIG. 2 is a plan view of the intersection. Due to the function of the approach detection module 21a, the control unit 20 causes the current determination point P _{J of the} host vehicle J (white rectangle) to be a first determination distance (predetermined for a node corresponding to an intersection ahead) (hereinafter referred to as an approach node C). Whether or not the other vehicle T is approaching the host vehicle J based on the current location P _T of the other vehicle T (black rectangle) acquired from the inter-vehicle communication unit 41 when approaching within 50 m), for example. Determine. The other vehicle T approaching the host vehicle J is the second determination distance (for example, the current location _PT is approaching the approaching node C and the current location _PT and the approaching node C are determined in advance. The other vehicle T is within 50 m). The first determination distance and the second determination distance may be set to a larger distance as the vehicle speed of the host vehicle J or the other vehicle T is higher.

Here, the other vehicle T which is approaching the vehicle J, on the other vehicle T the distance between the current position P _J location P _T and the vehicle J is in the distance (e.g., 70m) within the predetermined There may be. Due to the function of the approach detection module 21a, the control unit 20 approaches another vehicle T _S traveling on the same link as the host vehicle J and the other vehicle T _O traveling on the opposite lane link of the host vehicle J. Is excluded from the candidates for the other vehicle T. That is, the control unit 20 detects the other vehicle T approaching the host vehicle J from the lateral direction at the approach node C. Further, the control unit 20 does not have to detect the approach of the other vehicle T in all the approaching nodes C, and the intersection where the accident occurrence rate in the past is equal to or higher than the specified value or the building B where the prospect is poor exists in the vicinity. The approach of the other vehicle T may be detected only at the approach node C corresponding to.

  The traffic volume acquisition module 21b is a program module that causes the control unit 20 to realize a function of acquiring traffic volume at an intersection. With the function of the traffic volume acquisition module 21b, the control unit 20 acquires the traffic volume of all links connected to the approaching node C from the traffic volume information received by the communication unit 42. And the control part 20 acquires the average value of the traffic volume of all the links connected to the approaching node C as the traffic volume of the approaching node C. Note that the control unit 20 acquires the traffic volume of the approaching node C from the traffic volume of the links excluding the link on which the host vehicle J travels and the link of the opposite lane instead of all the links connected to the approaching node C. May be.

  The warning control module 21c detects the approach of the other vehicle T when the approach of the other vehicle T is detected and the traffic volume of the intersection is equal to or less than the first threshold value, and the traffic volume of the intersection is less than the first threshold value. This is a program module that causes the control unit 20 to realize the function of controlling the warning device 43 so as to emphasize the warning to the driver more than when it is larger. By the function of the warning control module 21c, the control unit 20 determines whether or not the traffic volume of the approaching node C is equal to or more than a first threshold value (for example, 3 cars / 1 minute) when the approach of the other vehicle T is detected. To do. That is, the control unit 20 determines whether or not the other vehicle T is approaching at an intersection where the traffic volume is large to some extent and the approach of the other vehicle T is expected. Although not shown, the first threshold value is recorded in advance on the recording medium 30.

With the function of the warning control module 21c, the control unit 20 causes the traffic volume of the approaching node C to be greater than the first threshold value when the traffic volume of the approaching node C where the approach of the other vehicle T is detected is equal to or less than the first threshold value. The warning device 43 is made to output a voice message having a higher emphasis level than the case.
Although not shown, sound source data for outputting a voice message is recorded in advance on the recording medium 30 for each enhancement degree. The voice message is a message for calling attention to the approach of the other vehicle T. When the traffic volume of the approaching node C in which the approach of the other vehicle T is detected is larger than the first threshold value, the control unit 20 outputs the voice message so that the traffic volume of the approaching node C is equal to or less than the first threshold value. The degree of warning emphasis may be made smaller than in some cases.

  When the approach of the other vehicle T is detected by the function of the warning control module 21c, the traffic volume at the intersection is less than or equal to the first threshold value, and the driver's traffic frequency at the intersection is greater than the second threshold value. The warning is given to the driver with more emphasis than when the approach of another vehicle T is detected, the traffic volume at the intersection is less than or equal to the first threshold, and the traffic frequency of the driver at the intersection is less than or equal to the second threshold. The warning device 43 is controlled. When the traffic volume of the approaching node C where the approach of the other vehicle T is detected is equal to or less than the first threshold value, the control unit 20 uses the function of the warning control module 21c to make the own vehicle at the approaching node C based on the history information 30b. Acquire the traffic frequency of J (driver). And the control part 20 determines whether the traffic frequency of the own vehicle J in the approach node C is larger than a 2nd threshold value (for example, 2 times / month).

  When the traffic frequency of the host vehicle J at the approaching node C where the approach of the other vehicle T is detected by the function of the warning control module 21c is greater than the second threshold, the control unit 20 The warning device 43 is made to output a voice message having a higher degree of emphasis than when the traffic volume of the traffic frequency is equal to or less than the second threshold value. When the traffic volume of the traffic frequency of the own vehicle J in the approach node C where the approach of the other vehicle T is detected is equal to or less than the second threshold, the control unit 20 does not output a voice message, thereby The degree of warning emphasis may be made smaller than when the traffic volume of the traffic frequency of the host vehicle J is greater than the second threshold.

  Further, the control unit 20 detects the approach of the other vehicle T by the function of the warning control module 21c, the traffic volume at the intersection is greater than the first threshold value, and the driver's traffic frequency at the intersection is equal to or less than the third threshold value. In this case, the approach of the other vehicle T is detected, and the driver is warned with more emphasis than when the traffic volume at the intersection is larger than the first threshold value and the traffic frequency of the driver at the intersection is larger than the third threshold value. The warning device 43 is controlled. When the traffic volume of the approaching node C where the approach of the other vehicle T is detected is larger than the first threshold value, the control unit 20 uses the function of the warning control module 21c to control the host vehicle at the approaching node C based on the history information 30b. Acquire the traffic frequency of J (driver). And the control part 20 determines whether the traffic frequency of the own vehicle J in the approach node C is larger than a 3rd threshold value (for example, 2 times / month). Note that the third threshold value may be the same value as the second threshold value or a different value.

  When the traffic frequency of the host vehicle J at the approaching node C where the approach of the other vehicle T is detected by the function of the warning control module 21c is less than or equal to the third threshold value, the control unit 20 The warning device 43 is caused to output a voice message having a higher emphasis level than when the traffic volume of the traffic frequency is larger than the third threshold. When the traffic volume of the traffic frequency of the own vehicle J in the approach node C where the approach of the other vehicle T is detected is larger than the third threshold, the control unit 20 does not output a voice message, thereby The degree of warning emphasis may be made smaller than when the traffic volume of the traffic frequency of the host vehicle J is equal to or less than the third threshold.

  Further, the function of the warning control module 21c allows the control unit 20 to detect the approach of the other vehicle T when the approach of the other vehicle T is detected and the size of the intersection is equal to or smaller than the fourth threshold, and The warning device is controlled to warn the driver with emphasis over the case where the scale is larger than the fourth threshold value. When the approach of the other vehicle T is detected by the function of the warning control module 21c, the control unit 20 determines the size of the intersection corresponding to the approaching node C based on the width of the link connected to the approaching node C. get. For example, the control unit 20 may acquire a value that increases as the average value of the widths of all the links connected to the approaching node C increases as the size of the intersection corresponding to the approaching node C.

  With the function of the warning control module 21c, the control unit 20 causes the size of the intersection corresponding to the approaching node C where the approach of the other vehicle T is detected to be equal to or less than a fourth threshold (for example, the average value of the width of the link to be connected is 10 m) or less In some cases, the warning device 43 is caused to output a voice message having a higher emphasis level than when the intersection is larger than the fourth threshold. When the scale of the intersection corresponding to the approaching node C where the approach of the other vehicle T is detected is larger than the fourth threshold, the control unit 20 does not output a voice message so that the scale of the intersection is equal to or smaller than the fourth threshold. The degree of warning emphasis may be made smaller than in the case of.

  In the configuration of the present embodiment described above, when the approach of another vehicle T is detected and the traffic volume at the intersection is equal to or less than the first threshold, the approach of the other vehicle T is detected and the traffic volume at the intersection is Since the driver is warned with more emphasis than when it is larger than the first threshold value, the warning can be performed with emphasis at an intersection where the driver is liable to fall out and the traffic is low. On the other hand, it is possible to suppress excessive warnings at intersections where there is a large amount of traffic where the driver is likely to pay attention.

  Here, it can be said that the driver is more easily alerted at an intersection where the traffic volume is low and the traffic frequency is high (intersection used to pass by). That is, when the traffic volume at the intersection is equal to or less than the first threshold value and the driver's traffic frequency at the intersection is greater than the second threshold value, it can be said that the driver is more alert. Therefore, the approach of the other vehicle T is detected when the approach of the other vehicle T is detected, the traffic volume at the intersection is less than or equal to the first threshold value, and the driver's traffic frequency at the intersection is greater than the second threshold value, Because the traffic volume at the intersection is less than the first threshold and the driver's traffic frequency at the intersection is less than the second threshold to warn the driver, emphasize at the intersection where it is easy to stay alert Can warn.

  Here, there is a high possibility that the driver originally pays attention at the intersection where there is a lot of traffic. In such a situation where attention is paid, there is a higher possibility that the discovery of the other vehicle T will be delayed at an intersection having a low traffic frequency (unfamiliar with the passage). The control unit 20 detects the approach of the other vehicle T when the approach of the other vehicle T is detected, the traffic volume at the intersection is larger than the first threshold value, and the driver's traffic frequency at the intersection is equal to or less than the third threshold value. Even if attention is paid by warning the driver by emphasizing more than when the traffic volume at the intersection is greater than the first threshold and the traffic frequency of the driver at the intersection is greater than the third threshold, It is possible to emphasize and warn at an intersection where there is a high possibility that the discovery of the other vehicle T will be delayed.

  Here, it can be said that the driver is likely to be alert at an intersection with a small scale. Therefore, it is possible to emphasize and warn at an intersection where it is easy to make a warning by emphasizing the warning when the size of the intersection is equal to or less than the fourth threshold.

(2) Other vehicle approach warning processing:
FIG. 2 is a flowchart of another vehicle approach warning process executed by the navigation device 10 as the other vehicle approach warning system. First, by the function of the approach detection module 21a, the control unit 20 determines whether or not the other vehicle T is approaching the front intersection (step S100). Specifically, the control unit 20 approaches the approach node C corresponding to the forward intersection of the current location P _J of the host vehicle J within a first determination distance (for example, 50 m), and from the inter-vehicle communication unit 41. When the current location P _{T of the} acquired other vehicle T is within a predetermined second determination distance (for example, 50 m) with respect to the approaching node C, the other vehicle T is approaching an intersection ahead. judge.

  When it is determined that the other vehicle T is approaching the front intersection (step S100: Y), the control unit 20 uses the function of the warning control module 21c to set the traffic volume of the approaching node C to the first threshold (for example, 3 / 1 minute) or less is determined (step S110). That is, the control unit 20 determines whether or not the traffic volume at the intersection where the host vehicle J and the other vehicle T are expected to approach is large enough for the driver to be alert. The traffic volume is the traffic volume of the approaching node C at the current time.

  When it is determined that the traffic volume of the approaching node C is equal to or less than the first threshold value (step S110: Y), the control unit 20 uses the function of the warning control module 21c to determine that the traffic frequency of the host vehicle J at the approaching node C is the second threshold value. It is determined whether it is larger than (for example, twice / month) (step S120). The control unit 20 determines whether or not the traffic volume at the intersection where the host vehicle J and the other vehicle T are expected to approach is small and the traffic frequency of the driver at the intersection is high enough for the driver to be alert. Determine.

  When it is determined that the traffic frequency of the host vehicle J at the approaching node C is greater than the second threshold (step S120: Y), the control unit 20 uses the function of the warning control module 21c to indicate the approach of the other vehicle T at the enhancement degree S4. A warning is given (step S130). The emphasis degree S4 means the greatest emphasis degree in the voice message of the approach of the other vehicle T to be output to the warning device 43. For example, the control unit 20 may indicate “an other vehicle is approaching an intersection ahead” as a voice message with an emphasis degree S4. Please be careful. May be output to the warning device 43. The control unit 20 may emphasize the warning by displaying a warning screen on the display as the warning device 43 together with the voice message having the enhancement degree S4.

  On the other hand, if it is not determined that the traffic frequency of the host vehicle J at the approaching node C is greater than the second threshold (step S120: N), the control unit 20 uses the function of the warning control module 21c to increase the other vehicle at the emphasis degree S3. An approaching warning for T is issued (step S140). The emphasis degree S3 means an emphasis degree next to the emphasis degree S4 in the approaching voice message of the other vehicle T to be output to the warning device 43. For example, the control unit 20 may say “An other vehicle is approaching the intersection ahead” as the voice message with the emphasis degree S3. be careful. May be output to the warning device 43.

  When it is not determined that the traffic volume of the approaching node C is equal to or less than the first threshold (step S110: N), the control unit 20 uses the function of the warning control module 21c to determine that the traffic frequency of the host vehicle J at the approaching node C is the first. It is determined whether or not it is 3 threshold values (for example, twice / month) or less (step S150). That is, the control unit 20 determines whether or not the driver's traffic frequency at an intersection where the own vehicle J and the other vehicle T are expected to approach each other with a large traffic volume is so small that the driver is not used to it. That is, the control unit 20 determines whether or not there is a high possibility that the other vehicle T may be overlooked because it is an unfamiliar intersection even if the driver is paying attention because the traffic volume is large.

  When it is determined that the traffic frequency of the host vehicle J at the approaching node C is equal to or less than the third threshold (step S150: Y), the control unit 20 uses the function of the warning control module 21c to determine that the intersection size of the approaching node C is the fourth threshold. It is determined whether or not (for example, the average width of the link to be connected is 10 m) or less (step S160). That is, the control unit 20 determines whether or not the other vehicle T is likely to be overlooked because it is unfamiliar, and the traffic volume is large for a small intersection. The size of the intersection may not be derived based on the width of the link to be connected, but may be derived based on the road type of the link to be connected, polygon data indicating the shape of the intersection, or the like.

  When it is determined that the intersection size of the approaching node C is equal to or smaller than the fourth threshold (step S160: Y), an approaching warning of the other vehicle T is issued with the enhancement degree S2 (step S170). The emphasis degree S2 means the emphasis degree next to the emphasis degree S3 in the approaching voice message of the other vehicle T to be output to the warning device 43. For example, the control unit 20 indicates that “another vehicle is approaching an intersection ahead” as a voice message with an emphasis degree S2. May be output to the warning device 43.

  On the other hand, when it is not determined that the intersection size of the approaching node C is equal to or smaller than the fourth threshold (step S160: N), an approaching warning of the other vehicle T is issued with the enhancement degree S1 (step S180). The emphasis degree S1 means an emphasis degree next to the emphasis degree S2 in the approaching voice message of the other vehicle T to be output to the warning device 43. For example, the control unit 20 may say “There is an intersection ahead” as a voice message with an emphasis S1. May be output to the warning device 43.

  By the way, when it is not determined that the other vehicle T is approaching the front intersection (step S100: Y), or the traffic frequency of the own vehicle J at the approaching node C with a small traffic volume is equal to or less than the third threshold value. Is not determined (step S150: N), an approaching warning of the other vehicle T is issued with the enhancement degree S0 (step S190). The enhancement degree S0 means that the warning device 43 does not output a voice message. That is, when the other vehicle T is not approaching in the first place and when traveling on an intersection where the traffic volume is large and the driver is accustomed, the warning about the approach of the other vehicle T is not performed.

(3) Other embodiments:
The above embodiment is an example for carrying out the present invention, and the embodiment can be changed within a range not impairing the effect of the present invention. According to the present invention, the warning enhancement level may be switched at least according to the determination result of step S110, and the process of switching the warning enhancement level according to the determination result of steps S120, S150, and S160 may be omitted. Further, the history information 30b is may be managed by the server 100, the current position P _T of the other vehicle T may be obtained from the server 100. Further, the server 100 or the like to manage the current position P _T location P _J and other vehicles T of the vehicle J, it may send data to the server 100 or the like to output a warning to the navigation device 10.

  The above embodiment is an example for carrying out the present invention, and various other embodiments can be adopted. The approach detection unit only needs to be configured to detect the approach of the other vehicle to the host vehicle at the intersection, and may detect the approach of the other vehicle by inter-vehicle communication with the other vehicle. You may detect the approach of another vehicle by communicating with the server which always monitors a position. In the situation where the host vehicle is approaching the intersection, it can be considered that the other vehicle is approaching the host vehicle when the other vehicle is approaching the same intersection. Therefore, a detector that detects the approach of another vehicle may be provided at the intersection, and the approach detection unit may detect the approach of the other vehicle by communicating with the detector.

  The traffic volume acquisition unit only needs to acquire the traffic volume at the intersection. For example, the traffic volume acquisition unit communicates with a server that generates traffic information such as traffic jam information by analyzing probe information collected from vehicle detectors and vehicles installed on the road. You may acquire the traffic volume of an intersection by performing. Of course, the traffic volume acquisition unit may acquire the traffic volume of the intersection based on learning information obtained by learning a travel history of the host vehicle (travel time of a link connected to the intersection, etc.). Furthermore, the traffic volume acquisition unit may acquire the traffic volume of the intersection based on the current season, day of the week, or time zone.

  The warning device may be a device that warns the driver by an image or a device that warns the driver by voice. To emphasize and warn may be to output a large amount of sound or image indicating the warning, or to increase the vocabulary of the warning message, or to increase the number of times the warning is repeated. Also good. The warning control unit may increase the degree of warning emphasis when the traffic volume at the intersection is equal to or less than the first threshold value than the degree of warning emphasis when the traffic volume at the intersection is larger than the first threshold value. Further, the warning control unit may issue a warning when the traffic volume at the intersection is equal to or less than the first threshold value, and may not issue a warning when the traffic volume at the intersection is larger than the first threshold value. The warning is a warning that calls attention to the approach of another vehicle.

  Further, the warning control unit detects the approach of the other vehicle when the approach of the other vehicle is detected, the traffic volume at the intersection is not more than the first threshold value, and the driver's traffic frequency at the intersection is greater than the second threshold value. The warning device is controlled so as to warn the driver with emphasis as compared to the case where the traffic volume of the intersection is detected and the traffic volume of the intersection is less than or equal to the first threshold and the traffic frequency of the driver at the intersection is less than or equal to the second threshold. Also good. Here, it can be said that the driver is more easily alerted at an intersection where the traffic volume is low and the traffic frequency is high (intersection used to pass by). That is, when the traffic volume at the intersection is equal to or less than the first threshold value and the driver's traffic frequency at the intersection is greater than the second threshold value, it can be said that the driver is more alert. In such a case, a warning can be given with emphasis.

  Furthermore, the warning control unit detects the approach of another vehicle when the approach of the other vehicle is detected, the traffic volume at the intersection is larger than the first threshold value, and the driver's traffic frequency at the intersection is equal to or less than the third threshold value. The warning device may be controlled so as to warn the driver with more emphasis than when the traffic volume at the intersection is greater than the first threshold and the traffic frequency of the driver at the intersection is greater than the third threshold. . There is a high possibility that the driver originally pays attention at the intersection with heavy traffic. In such a situation where attention is paid, there is a higher possibility that the discovery of other vehicles will be delayed at an intersection having a low traffic frequency (unfamiliar with it). Even if attention is paid, a warning can be given with emphasis at intersections where there is a high possibility that the discovery of other vehicles will be delayed.

  Further, the warning control unit detects an approach of another vehicle, and if the intersection size is equal to or smaller than the fourth threshold value, detects an approach of another vehicle and the intersection size is larger than the fourth threshold value. The warning device may be controlled so that the driver is warned with more emphasis. Here, it can be said that the driver is likely to be alert at an intersection with a small scale. Therefore, it is possible to emphasize and warn at an intersection where it is easy to make a warning by emphasizing the warning when the size of the intersection is equal to or less than the fourth threshold.

  Each component (approach detection unit, traffic volume acquisition unit, warning control unit) constituting the other vehicle approach warning system may be realized by one device as in the above-described embodiment, or two or more It may be divided into the devices. As the latter, for example, a configuration in which any one of the approach detection unit, the traffic volume acquisition unit, and the warning control unit is distributed to two or more devices can be employed. In the above-described embodiment, the approach detection unit, the traffic volume acquisition unit, and the warning control unit are realized by the control unit 20 executing the program modules 21a to 21c. And the warning control unit may be realized by dedicated hardware (ASIC or the like).

  The system, program, and method as described above can be assumed to be realized as a single device or a plurality of devices, and include various aspects. For example, it is possible to provide a server, a method, and a program that include the above components. Further, some changes may be made as appropriate, such as a part of software and a part of hardware. Furthermore, the invention can be realized as a recording medium for a program for controlling the system. Of course, the software recording medium may be a magnetic recording medium, a magneto-optical recording medium, or any recording medium to be developed in the future.

DESCRIPTION OF SYMBOLS 10 ... Navigation apparatus, 20 ... Control part, 21 ... Other vehicle approach warning program, 21a ... Approach detection module, 21b ... Traffic volume acquisition module, 21c ... Warning control module, 30 ... Recording medium, 30a ... Map information, 30b ... History information, 41 ... inter-vehicle communication unit, 42 ... communication unit, 43 ... warning device, 44 ... position sensor, 100 ... server, B ... buildings, C ... closer node, P _J, P _T ... You are here, J ... vehicle, T ... Other vehicles

Claims (6)

An approach detector for detecting the approach of another vehicle to the host vehicle at an intersection;
A traffic volume acquisition unit for acquiring the traffic volume of the intersection;
When the approach of the other vehicle is detected and the traffic volume at the intersection is equal to or lower than the first threshold, the approach of the other vehicle is detected and the traffic volume at the intersection is larger than the first threshold. A warning control unit that controls the warning device so as to warn the driver with emphasis
Other vehicle approach warning system. When the approach of the other vehicle is detected, the traffic volume at the intersection is equal to or less than the first threshold, and the driver's traffic frequency at the intersection is greater than a second threshold, When the approach of another vehicle is detected, the traffic volume at the intersection is less than or equal to the first threshold value, and the driver's traffic frequency at the intersection is less than or equal to the second threshold value, the driver is warned. To control the warning device,
The other vehicle approach warning system according to claim 1. When the approach of the other vehicle is detected, the traffic volume at the intersection is greater than the first threshold, and the traffic frequency of the driver at the intersection is equal to or less than a third threshold, the warning control unit Warning is given to the driver with emphasis more than when the approach of a vehicle is detected, the traffic volume at the intersection is greater than the first threshold value, and the traffic frequency of the driver at the intersection is greater than the third threshold value. Controlling the warning device to
The other vehicle approach warning system according to claim 1 or 2. The warning control unit detects the approach of the other vehicle when the approach of the other vehicle is detected and the size of the intersection is equal to or smaller than a fourth threshold value, and the scale of the intersection is the fourth threshold value. Controlling the warning device to warn the driver with more emphasis than if greater than
The other vehicle approach warning system according to any one of claims 1 to 3. An approach detection step of detecting the approach of another vehicle to the host vehicle at an intersection;
A traffic acquisition step of acquiring traffic at the intersection;
When the approach of the other vehicle is detected and the traffic volume at the intersection is equal to or lower than the first threshold, the approach of the other vehicle is detected and the traffic volume at the intersection is larger than the first threshold. A warning control process for controlling the warning device so as to warn the driver with emphasis, and
Other vehicle approach warning method including. An approach detection function for detecting the approach of another vehicle to the host vehicle at an intersection;
A traffic volume acquisition function for acquiring the traffic volume of the intersection;
When the approach of the other vehicle is detected and the traffic volume at the intersection is equal to or lower than the first threshold, the approach of the other vehicle is detected and the traffic volume at the intersection is larger than the first threshold. A warning control function that controls the warning device so as to warn the driver with emphasis, and
Other vehicle approach warning program that makes computer realize.

Images