JP4197468B2 - Information display system and information display method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information display system and an information display method for displaying information according to service information acquired from an infrastructure provided on a road, and in particular, service information related to traffic conditions at an intersection between a non-priority road and a priority road. It is related to the display method.
[0002]
[Prior art]
In recent years, development of technology (for example, ITS (Intelligent Transport System)) that promotes safety of road traffic using information communication technology has been promoted. One of these technologies is AHS (Advanced Cruise-Asist Highway System). In AHS, driving support in which roads and vehicles are integrated is performed by communication between a road-side system (road-side infrastructure) and an in-vehicle system.
[0003]
One form of AHS service is information provision, and information on events targeted by the service, such as information on stopped vehicles, presence of curves, road surface conditions, traffic conditions at intersections, pedestrians on pedestrian crossings, etc. Provided. Such information provision is often performed by using a display device provided in a vehicle (see, for example, Patent Documents 1 and 2). By displaying the service information, it is possible to notify the driver of the traffic situation ahead of the host vehicle and to call the driver's attention as necessary, so that driving safety can be improved.
[0004]
[Patent Document 1]
JP 2001-101593 A [Patent Document 2]
Japanese Patent Laid-Open No. 2001-101595
[Problems to be solved by the invention]
By the way, among the AHS services, there is an encounter collision prevention support (starting support system). In this service, the traffic situation at the intersection of the priority road and the non-priority road is monitored, and service information indicating the traffic situation is provided to the own vehicle traveling on the non-priority road as needed.
[0006]
However, when the own vehicle that has traveled on the non-priority road (the vehicle on the road side where the service information is provided) enters the intersection, the own vehicle is also included in the service monitoring target. Therefore, the driver may misunderstand or confuse the existence of the own vehicle included in the service information with other vehicles or pedestrians.
[0007]
The present invention has been made in view of such circumstances, and an object of the present invention is to prevent driver misidentification and confusion associated with the display of service information while ensuring driving safety by providing service information.
[0008]
[Means for Solving the Problems]
In order to solve such a problem, the first invention provides service information relating to traffic conditions at the intersection of the non-priority road and the priority road on the non-priority road side by the own vehicle entering the intersection from the non-priority road side. Provided is an information display system that displays information according to service information by obtaining from the infrastructure provided. The information display system includes an acquisition device that acquires service information transmitted from road-side infrastructure, a computer that determines information to be displayed based on the service information, and the information controlled and displayed by the computer. And a display device. The acquisition device acquires service information related to traffic conditions on a pedestrian crossing and a priority road on a non-priority road. When the host vehicle enters the intersection from the non-priority road side, the computer controls the display device to display the information according to the service information, and when the host vehicle reaches the stop line in front of the pedestrian crossing The information display on the display device is stopped .
[0010]
In the first invention, a preview sensor may be further provided that outputs the traveling situation around the front of the host vehicle as preview information. In this case, it is preferable that the computer controls the display device to display preview information instead of stopping the information display. In addition, the preview sensor is provided at the front end of the host vehicle, and captures a landscape on the left side of the host vehicle by capturing a scene on the left side of the host vehicle and a landscape on the right side of the host vehicle. Accordingly, a second camera that outputs the second image may be included. In this case, the computer controls the display device so as to display the first image and the second image, respectively.
[0011]
According to a second aspect of the present invention, service information relating to traffic conditions at an intersection between a non-priority road and a priority road is acquired by an own vehicle entering the intersection from the non-priority road side from an infrastructure provided on the non-priority road side. An information display method for displaying information in accordance with service information is provided. In this information display method, a first step in which the acquisition device acquires service information regarding traffic conditions on a pedestrian crossing and a priority road on a non-priority road, and a computer enters the intersection from the non-priority road side. A second step of controlling the display device to display information according to the service information, and a third step of stopping the information display on the display device when the host vehicle reaches the stop line before the crosswalk . Steps.
[0013]
In addition, in the second invention, instead of stopping the information display, a third step of displaying the driving situation around the front of the host vehicle as preview information may be further provided. In this case, the third step is a step of displaying a first image obtained by capturing the scenery on the left side of the vehicle from the front end of the host vehicle, and an image of the scene on the right side of the vehicle from the front end of the host vehicle. And a step of displaying a second image obtained by.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing an overall configuration of a traffic system 1 including an information display system 10 according to the present embodiment. This traffic system 1 is generally called AHS, and is composed of an information display system 10 mounted on the host vehicle C and an infrastructure 20 (hereinafter simply referred to as “road side infrastructure”) provided on the road. Is done. In the AHS 1, the information display system 10 and the road-side infrastructure 20 communicate to provide a predetermined service (running support). There are various variations in the service scheduled to be operated in AHS1, but in this embodiment, description will be given of the encounter collision prevention support (hereinafter simply referred to as “encounter support”), which is one of the intersection services. To do. Meeting support is classified into an approach support system and a start support system, and when this service is performed, information on events targeted by the service is provided. Specifically, in the approach support system, information such as a temporary stop position before the intersection is provided to the information display system 10, and in the start support system, information on other vehicles and pedestrians traveling on the intersecting priority road is obtained. Provided to the information display system 10.
[0015]
Here, before describing the information display system 10 that is one of the features of the present embodiment, the road-side infrastructure 20 will be described first. The road side infrastructure 20 is mainly composed of DSRCs arranged continuously or discretely. The DSRC transmits information to the information display system 10 using spot communication using a predetermined radio frequency band (for example, 5.8 GHz band). When the DSRC is functionally grasped, it is classified into a base point DSRC 21 and an information DSRC 22, and information transmission regarding the service is performed by linking the base point DSRC 21 and the information DSRC 22. Therefore, one base area DSRC 21 and at least one information DSRC 22 are provided in one service area. Here, the service area refers to an area on the road where service is performed by AHS1.
[0016]
The base point DSRC 21 is a DSRC serving as a positional reference while indicating the start of the service, and transmits base point information. This base point information is composed of system information and service control information. The system information includes the ID of the DSRC that transmitted the base point information and the type of whether or not this DSRC is the base point DSRC21. The service control information includes the ID of the information DSRC 22 combined with the base point DSRC 21.
[0017]
The information DSRC 22 is a DSRC that transmits service information, and transmits information related to a specific service. This service information includes system information, service control information, service status information, service end point information, and individual service information. The system information includes the ID of the DSRC that transmitted the information and the type of whether or not the DSRC is information DSRC22. The service control information includes the ID of the base point DSRC 21 combined with the information DSRC 22 and the like. The service status information includes the type of service transmitted by the information DSRC 22 and the operating / non-operating status of the service. The service end point information includes a point at which the service ends (hereinafter simply referred to as “service end point”). The individual service information includes information necessary for each service.
[0018]
Information transmitted by the base point DSRC 21 and the information DSRC 22 is centrally managed by base stations (not shown) provided on the DSRC 21 and 22 side. This base station monitors the traffic situation in the information target section set on the road at a predetermined interval (for example, 100 msec), and creates and updates service information (particularly, individual service information) as needed. Therefore, information corresponding to the current traffic situation on the road is reflected in the service information transmitted via the information DSRC 22.
[0019]
FIG. 2 is an explanatory diagram showing DSRCs 21 and 22 and information target sections provided at intersections. The base station (not shown) uses, for example, a visible camera, an infrared camera, and an infrared sensor to capture or scan the information target section set on the priority road including the intersection, and output results from these cameras and sensors Based on the above, the traffic situation is monitored. As shown in the figure, the information target section for encounter support includes the area on the priority road from the center point of the intersection to the point just before the intersection and the shoulder of the priority road including the pedestrian crossing on the non-priority road. It is set to the upper area. In the information target section, the speed and position of an approaching vehicle, the speed and position of a passing vehicle (such as a two-wheeled vehicle), and the like are detected, and pedestrian information is also detected. The traffic situation at the intersection of the non-priority road and the priority road is transmitted to the own vehicle C side as individual service information of information DSRC22 (starting support system) provided in the vicinity of the intersection. Further, information such as the road shape and distance from the base point DSRC21 to the stop line, and the distance from the stop line to the intersection is transmitted to the own vehicle C side as individual service information of the information DSRC22 (access support system).
[0020]
With reference to FIG. 1 again, the information display system 10 which is an in-vehicle system will be described. The information display system 10 is mainly configured by an acquisition device 11, a computer 14, and a display device 15, and based on the acquired base point information and service information, information corresponding to the service information to the driver of the host vehicle C. Is displayed.
[0021]
The acquisition device 11 acquires base point information and service information transmitted from the DSRCs 21 and 22. Since the information transmission from the DSRCs 21 and 22 is performed by wireless communication, the acquisition device 11 includes an antenna 12 and a wireless device 13. The antenna 12 that receives radio waves of a predetermined frequency transmitted from the DSRCs 21 and 22 is provided on, for example, a dashboard (instrument panel). Information received by the antenna 12 is output to the wireless device 13. The wireless device 13 extracts predetermined information from the received radio wave and outputs this information to the computer 14.
[0022]
As the computer 14, a microcomputer mainly composed of a CPU, a ROM, a RAM, an input / output interface and the like can be used. The computer 14 provides necessary information to the driver based on the information (base point information and service information) acquired by the acquisition device 11. Specifically, when the computer 14 acquires information from the road-side infrastructure 20, first, the information is information transmitted from the base point DSRC 21 (base point information), or information transmitted from the information DSRC 22 ( Service information). If the acquired information is the base point information, the computer 14 stores this information. If the acquired information is service information, the computer 14 determines whether the information DSRC 22 and the base point DSRC 21 are an appropriate combination. Make a decision. Further, the computer 14 determines information to be displayed to the driver (hereinafter referred to as “display information”) based on the service information.
[0023]
Vehicle information related to the vehicle C including the vehicle speed of the vehicle C detected by the vehicle state sensor 16, the blinker blinking state, the brake operating state, and the like is input to the computer 14 via the input / output interface. At the same time, preview information output from the preview sensor 17 is input. The preview sensor 17 is composed of a pair of cameras (not shown). Each camera incorporates an image sensor (for example, a CCD or CMOS sensor), and images the scenery around the front of the host vehicle C by cooperating with each other. One camera is provided, for example, at the left front end of the bumper, and images the left front scene from the left side of the host vehicle C. The other camera is provided, for example, at the right front end of the bumper, and captures a scene in the right front from the right side of the host vehicle C. In a state where they are synchronized with each other, each analog image output from the left and right cameras is digitally converted into a predetermined luminance gradation (for example, 256 gradation gray scale) by an A / D converter (not shown). Each image is converted into an image and then output to the computer 14.
[0024]
The display device 15 is disposed, for example, on a part of the instrument panel and is controlled by the computer 14 to display display information on the display screen. By this information display, information corresponding to the service information is provided to the driver. In addition to the information display, the driver may be notified of the service information by voice or warning sound using a speaker.
[0025]
Next, an information display method according to the present embodiment will be described. FIG. 3 is a flowchart showing information display processing according to the present embodiment. One of the features of the present embodiment is a method of displaying information in a service area set at an intersection between a priority road and a non-priority road as shown in FIG. The routine shown in this flowchart is called at a predetermined cycle (100 msec) and executed by the computer 14 while the host vehicle C is traveling in the service area.
[0026]
First, the base point information is acquired by the computer 14 when the host vehicle C entering the intersection from the non-priority road side passes through the wireless zone formed by the base point DSRC21. The computer 14 specifies that this information is transmission information from the base point DSRC 21 based on this base point information (more precisely, system information). Further, the computer 14 starts to detect the accumulated travel distance of the vehicle C with reference to the position of the base point DSRC 21 (more precisely, the position where the base point information is received). The accumulated travel distance can be calculated based on the vehicle speed V detected by the vehicle state sensor 16. When the base point information is received, nothing is basically displayed on the display screen of the display device 15. However, the computer 14 may display a message indicating that the service provided by the AHS 1 is predicted on the display device 15 or may output a chime or voice information indicating that the service is predicted via a speaker. Good.
[0027]
Next, when the vehicle C passes through a wireless zone formed by the information DSRC 22 (proximity support system or start support system), the computer 14 acquires service information. The computer 14 specifies the ID of the base point DSRC 21 to be combined with the currently passed information DSRC 22 based on the service control information in the service information. Then, the identified ID is compared with the ID of the base point DSRC21 that has passed previously, and the combination of the base point DSRC21 and the information DSRC22 that the vehicle C has passed is appropriate only when the two match. Judge that there is. Based on this determination, the entry of the host vehicle C into the service area is recognized, and the initial cycle of this routine is executed.
[0028]
First, in step 1, it is determined whether or not the service in this service area is dating support. This determination can be made by referring to service control information in the received service information. If the type of service information acquired is support for encounters, an affirmative determination is made in step 1 and processing proceeds to step 2 that follows. On the other hand, if the specified type is service information other than the meeting support, the result in Step 1 is negative, and therefore the processing after Step 2 is skipped.
[0029]
In step 2, it is determined whether or not the currently provided service is a start support system. As described above, since the encounter support is classified into the start support system and the approach support system, it is necessary to determine which of the systems the currently acquired service corresponds to. In general, the approach support system is a service that alerts the driver when approaching the stop line before the intersection. It is provided in the distance. Therefore, normally, the vehicle C first passes the information DSRC22 of the approach support system, and then passes the information DSRC22 of the start support system. Therefore, until the vehicle C passes through the information DSRC 22 (starting support system), the service information of the starting support system is not acquired, and thus the denial continues in this step 2. In accordance with this negative determination, the process proceeds to step 3, so that the processes after step 4 are skipped. On the other hand, if the host vehicle C passes the information DSRC 22 (starting support system), the service information of the starting support system is acquired, so the determination in step 2 is switched from negative to affirmative and the process proceeds to step 4.
[0030]
In step 3 following step 2, the acquired service information, that is, service information of the approach support system is displayed on the display device 15. FIG. 4 is an explanatory diagram illustrating an example of display information. In the approach support system, a message prompting attention to the stop line before the intersection of the priority road ahead is displayed. Specifically, the road shape to the intersection, the position of the stop line, and the progress of the host vehicle to the intersection are displayed. Further, in the case of strongly urging attention to the stop line, a symbol imitating a “stop” traffic sign is further displayed.
[0031]
In step 4, it is determined whether or not the host vehicle C has reached the stop line. The position of the stop line is given as a distance from the base point DSRC 21 by the service information acquired from the information DSRC 22 (approach system at the time of approach) that has passed previously. Therefore, the computer 14 performs this determination by determining whether or not the accumulated traveling distance of the vehicle C has reached the distance from the base point DSRC21. Therefore, when the host vehicle C is traveling in front of the stop line, the result of step 4 continues to be denied, so the process of step 6 is skipped and the process proceeds to step 5. On the other hand, if the host vehicle C has reached the stop line, the determination in step 4 is switched from negative to affirmative, and the process proceeds to step 6.
[0032]
In step 5, the acquired service information, that is, information related to the start support system is displayed on the display device 15. FIG. 5 is an explanatory diagram showing another example of display information. In the starting support system, the specific traffic situation of the priority road is displayed. Specifically, a symbol simulating an approaching vehicle, a symbol simulating a passing vehicle, or a symbol simulating a pedestrian is displayed corresponding to the traveling shape of the vehicle or pedestrian in the information target section.
[0033]
In step 6, information corresponding to the service information (for example, information shown in FIG. 5) displayed until the host vehicle C reaches the temporary stop line is hidden (information display is stopped). In step 7, the image data captured by the preview sensor 17 is read, and the image data (preview information) of the left and right cameras is displayed on the display device 15 as shown in FIG. In other words, preview information is displayed instead of stopping the information display. The image data is read in time series until the service area is terminated, and the image data is displayed.
[0034]
Thus, according to the present embodiment, the display of the service information is stopped when the own vehicle C traveling on the non-priority road reaches the stop line. Since the information target section set as the priority road also includes an intersection, when the vehicle C enters the intersection, an inconvenience that the own vehicle C becomes a monitoring target of the road-side infrastructure 20 occurs. In the service information provided from the road side infrastructure 20, it cannot be determined whether the monitored vehicle is the own vehicle C or another vehicle traveling on the priority road. Therefore, even if the host vehicle C is displayed on the display screen, the driver may misunderstand the presence of the host vehicle C as another vehicle (or a pedestrian on a pedestrian crossing) traveling on the priority road. Therefore, in order to avoid such inconvenience, in this embodiment, based on the knowledge that the stop line is not included in the information target section in the encounter support, the service information information is obtained when the vehicle C reaches the stop line. Stop display. Thereby, generation | occurrence | production of the driver's misunderstanding can be reduced. Also, up to the stop line, the traffic status of the priority road is displayed based on the service information, which contributes to a safer driving compared to the case where no service information is displayed despite being in the service area. be able to.
[0035]
In the present embodiment, the information display corresponding to the service information is stopped when the vehicle C reaches the stop line, but the present invention is not limited to this. For example, the service information may be hidden at a point before entering the intersection in consideration of the information target section set at the intersection based on the system requirements of AHS1. Even in such a method, in the situation where the vehicle C enters the information detection zone, the service information is not displayed, so that the driver's misunderstanding can be reduced.
[0036]
Moreover, according to this embodiment, it replaces with the stop of the information display of service information, and the image data which imaged the front periphery of the own vehicle C is displayed. Since the preview sensor 17 that outputs the image data captures the scenery around the front of the host vehicle C, the preview sensor 17 captures the situation of the priority road when the host vehicle C searches the intersection. Therefore, the traffic situation at the intersection is displayed on the display screen. As a result, even if it is difficult to visually check the priority road, the driver can recognize the traffic situation of the priority road, so it is possible to safely start from the temporary stop.
[0037]
In addition to using a monocular camera that outputs image data, the preview sensor 17 is a well-known stereo image processing apparatus composed of a stereo camera and an image processing system, a sensor using millimeter waves or laser waves, or the like. You may use the sensor used together. And the driving | running | working condition recognized by these sensors, for example, the presence or absence of an approaching vehicle, the distance to the vehicle, etc. may be displayed on the display device 15. As a result, the traffic situation of the priority road is displayed as with the image data, so it is possible to start safely from the stop line.
[0038]
【The invention's effect】
According to the present invention, in the information display system, the information display according to the service information is stopped before entering the intersection of the host vehicle. As a result, it is possible to prevent misunderstanding and confusion of the driver accompanying the continued display of the service information by stopping the information display as necessary while ensuring the driving safety by providing the service information.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the overall configuration of a traffic system including an information display system according to the present embodiment. FIG. 2 is an explanatory diagram showing DSRC and information target sections provided at an intersection. FIG. 4 is an explanatory diagram showing an example of display information. FIG. 5 is an explanatory diagram showing another example of display information. FIG. 6 is an explanatory diagram showing an output result from a preview sensor. [Explanation of symbols]
1 AHS
DESCRIPTION OF SYMBOLS 10 Information display system 11 Acquisition apparatus 12 Antenna 13 Radio | wireless machine 14 Computer 15 Display apparatus 16 Vehicle state sensor 17 Preview sensor 20 Road side infrastructure 21 Base point DSRC
22 Information DSRC

Claims (6)

The service information on the traffic situation at the intersection of the non-priority road and the priority road is acquired by the own vehicle entering the intersection from the non-priority road side from the infrastructure provided on the non-priority road side. In an information display system that displays information according to information,
An acquisition device for acquiring service information transmitted from the road side infrastructure;
A computer for determining information to be displayed based on the service information;
A display device controlled by the computer and displaying the determined information;
The acquisition device acquires service information related to a traffic situation on a pedestrian crossing on the non-priority road and the priority road,
If the own vehicle enters the intersection from the non-priority road side, the computer, the controls the display unit so displays information corresponding to the service information, the host vehicle is closer than the crosswalk An information display system for stopping the information display on the display device when the stop line is reached . A preview sensor that outputs the driving situation around the front of the host vehicle as preview information;
The computer, the information displayed in place of the stop, so as to perform display of the preview information, the information display system according to claim 1, wherein the controller controls the display device. The preview sensor is provided at a front end portion of the host vehicle, and captures a landscape on the left side of the host vehicle by capturing a scene on the left side of the host vehicle and a landscape on the right side of the host vehicle. And a second camera that outputs a second image,
The information display system according to claim 2 , wherein the computer controls the display device so as to display the first image and the second image, respectively. The service information on the traffic situation at the intersection of the non-priority road and the priority road is acquired by the own vehicle entering the intersection from the non-priority road side from the infrastructure provided on the non-priority road side. In an information display method for displaying information according to information,
A first step in which the acquisition device acquires service information relating to a traffic situation on a pedestrian crossing on the non-priority road and the priority road;
Computer, when the vehicle enters the intersection from the non-priority road side, a second step of controlling the display unit to perform information display in accordance with the service information, the own vehicle is the crosswalk And a third step of stopping the information display on the display device when the stop line is reached . 5. The information display method according to claim 4 , further comprising a third step of displaying, as preview information, a driving situation around the front of the host vehicle instead of stopping the information display. The third step includes a step of displaying a first image obtained by capturing a landscape on the left side of the vehicle from the front end of the host vehicle, and capturing a landscape on the right side of the vehicle from the front end of the host vehicle. The method for displaying information according to claim 5 , further comprising a step of displaying a second image obtained by.

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