WO2015159497A1

WO2015159497A1 - Navigation system

Info

Publication number: WO2015159497A1
Application number: PCT/JP2015/001915
Authority: WO
Inventors: 公治清水
Original assignee: 株式会社デンソー
Priority date: 2014-04-16
Filing date: 2015-04-06
Publication date: 2015-10-22
Also published as: JP2015212686A

Abstract

In a vehicle-mounted device (2) in a navigation system (1), if a host vehicle is predicted to approach a guide point, a traffic information acquisition unit (53) receives an FM multiplex broadcast from a second traffic information center (4) and acquires and stores traffic information. When the host vehicle passes a guide image creation start point, a guide image creation unit (54) reads simple graphic data for the guide point from the map data storage unit, reads traffic information from the traffic information storage device, and creates a guide image for display from the read simple graphic data and traffic information. A drawing unit (55) displays the guide image for display on a display (9).

Description

Navigation system

Cross-reference of related applications

The present disclosure is based on Japanese Application No. 2014-84589 filed on April 16, 2014 and Japanese Application No. 2015-32894 filed on February 23, 2015. Is used.

This disclosure relates to a navigation system.

Conventionally, there is Patent Literature 1 as a technology for providing traffic information guidance at a specific point. This technology receives the guidance information (simple graphic data and traffic information of the guidance point) for the guidance point on the roadside machine (beacon etc.) existing in front of the guidance point which is the specific point to be guided, This is a technique for creating a guide image of a guide point based on simple graphic data and traffic information, and controlling or drawing on a display.

However, since the above-mentioned technology requires the installation of infrastructure such as roadside machines, it is not easy to secure the installation cost and the installation location.

As a technology to improve, a method of providing guidance information using telematics communication (communication using a line such as a mobile phone network or a car phone network) is considered. As this method, information (latitude, longitude, traveling direction, etc.) of an information acquisition start point for acquiring information on the guide point in front of the guide point is registered in advance in the on-vehicle device. When the host vehicle position detection function in the host vehicle determines that the host vehicle has reached the information acquisition start point, an information request command is transmitted from the on-board unit to the information center by telematics communication, and the latest guidance information is transmitted from the information center by telematics communication. Can be obtained (downloaded) and a display relating to the guide point is displayed (see FIG. 13).

JP 2004-354212 A

However, in the above-mentioned method, because the guide information is downloaded from the information center by telematics communication at the information acquisition start point before the guide point, the download time may be longer than the originally scheduled time depending on the radio wave condition and the line condition. There is also. For this reason, the creation and display of the guide image may not be in time for the recommended display area in front of the guide point. As a countermeasure, if the information acquisition start point is previously separated from the guide point by a considerable distance, the display timing will be earlier when the communication line is not congested, and another branch point before the guide point. When there was, there was a case where it was misunderstood that it was the guidance of the branch point. In addition, since guidance information is downloaded by telematics communication every time guidance is performed, there is a problem that a communication fee increases when frequent guidance is performed.

An object of the present disclosure is to provide a navigation system that can surely display guidance information about a guidance point in front of the guidance point and can contribute to a reduction in communication charges by eliminating telematics communication that has occurred every time guidance is performed. is there.

In the navigation system of one example of the present disclosure, the approach prediction unit predicts whether or not the host vehicle is approaching the guide point in a direction that sequentially passes through the guide image creation start point and the guide point. The traffic information acquisition unit receives the FM multiplex broadcast from the second traffic information center when the approach prediction unit predicts that the host vehicle is approaching the guidance point, acquires the traffic information, and stores it in the traffic information storage unit. Remember. The guide image creation unit reads the simple graphic data of the guide point where the approach is predicted from the map data storage at the timing when the host vehicle passes the guide image creation start point, and the approach is predicted from the traffic information storage. The traffic information of the guide point to be read is read, and a display guide image is created from the read simple graphic data and the traffic information. The drawing unit causes the display device to display the display guide image created by the guide image creating unit.

According to the navigation system having the above configuration, when the host vehicle is predicted to approach the guide point and passes the guide image creation start point in front of the guide point, the simple graphic data and the traffic information are already acquired. Yes. For this reason, since the telematics communication with unstable acquisition time is not used after passing through the guide image creation start point, the host vehicle passes the guide image creation start point toward the guide point in a short time and almost A display guide image for a guide point can be created based on simple graphic data and traffic information in a certain time. Therefore, the guidance information regarding the guidance point can be reliably displayed in front of the guidance point (recommended display area). In addition, since traffic information is acquired by FM multiplex broadcasting and simple graphic data is read from the map data storage device, it is not necessary to receive information by telematics communication at every guidance, which can contribute to reduction of communication charges.

The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings.
1 is a block diagram showing a schematic configuration of a navigation system according to a first embodiment of the present disclosure. Flow chart showing the control contents of the control circuit of the OBE The flowchart which shows the control content of the control circuit of a 1st traffic information center The flowchart which shows the control content of the control circuit of a 2nd traffic information center Figure showing an example of map display A figure showing an example of a simple figure Figure showing an example of a traffic jam image Figure showing an example of a guide image Illustration for explaining the display of traffic congestion The figure which shows the example of display of the guidance picture Diagram for explaining the overall operation The flowchart which shows 2nd Embodiment of this indication and shows the control content of the simple figure data acquisition part of onboard equipment. FIG. 11 equivalent diagram in the conventional example

(First embodiment)
Hereinafter, a first embodiment of the present disclosure will be described with reference to FIGS. 1 to 11.

1, the navigation system 1 includes an in-vehicle device 2, a first traffic information center 3, and a second traffic information center 4.

The in-vehicle device 2 is a navigation device and is mounted on a vehicle such as an automobile. A vehicle equipped with the vehicle-mounted device 2 is also referred to as a host vehicle or a target vehicle. The vehicle-mounted device 2 includes a control circuit 5, a position detector 6, a map data input unit 7, an operation switch 8, a display 9, a voice controller 10, a remote control sensor 11, a telematics communication device 12, a storage device 13, and an FM broadcast receiver. 14 and so on.

The control circuit 5 is also referred to as a control device 5 and is mainly composed of a microcomputer having a CPU, a ROM and a RAM (not shown). The vehicle-mounted device 2 executes a control program in the CPU of the control circuit 5, whereby an approach prediction unit 51, a simple graphic data acquisition unit 52, a traffic information acquisition unit 53, a guide image creation unit 54, a drawing unit 55 (display control unit) Is also virtually realized by software.

The position detector 6 detects the current position of the vehicle on which the vehicle-mounted device 2 is mounted. The position detector 6 includes an azimuth sensor 61, a gyro sensor 62 (gyroscope), a distance sensor 63, and a GPS receiver 64. The direction sensor 61 detects the direction of the vehicle. The gyro sensor 62 detects the rotation angle of the vehicle. The distance sensor 63 detects the travel distance of the vehicle. The GPS receiver 64 receives a radio wave transmitted from a GPS satellite (not shown) in order to determine the current position of the vehicle by GPS (Global Positioning System).

The map data input unit 7 acquires map data from the map data storage 71. The map data stored in the map data storage 71 is read into the map data input unit 7 by a drive device (not shown). As the map data storage 71, for example, a large-capacity storage medium such as a DVD or CD, a storage medium such as a memory card (for example, a flash memory card such as an SD memory card) or a hard disk drive is used.

The map data stored in the map data storage unit 71 is provided in advance by a DVD, a hard disk drive or the like, or distributed from the first traffic information center 3 described later, and a link connecting a plurality of nodes and nodes. Various data such as road data, landmark data, map matching data, destination data, and table data for converting traffic information into road data. A link number is associated with the link.

In this map data, the coordinate information (position information) of the branch points (branch points included in the map data) existing on the map and the shape of each branch point (cross road, Y-junction, three-way road, etc.) are specified. Various information such as branch point shape information and point information (city name, facility name, place name, etc.) is included. Further, the map data includes information such as coordinate information (position information) of one or more guide points and simple graphic data regarding each guide point. Further, the map data includes a branch point number, a guide point number (data number of the guide point), and the like. The branch point number is a number given in association with the position of each branch point in order to specify the position of the branch point of the road existing on the map. The guide point number is a number assigned in association with the position and range of each guide point in order to specify the position and range of the guide point. In the map data, position information of the guide image creation start point is also set around the guide point. The guide image creation start point is set at a position before the guide point on the road where the vehicle is predicted to pass when the vehicle passes the guide point.

Here, the guide point is a point to be displayed on the guide image. This guidance point is an area of a predetermined range including each branch point, and is set as an area for displaying a guidance image on the display 9 when a vehicle enters the area.

The operation switch 8 is also referred to as the operation device 8 and includes a mechanical switch provided near the screen of the display 9 and a touch panel switch provided on the screen of the display 9. The user uses each switch of the operation switch 8 to switch the destination of the vehicle, the screen of the display 9 and the display mode (for example, change of the map scale, selection of the menu screen, route search, start of route guidance, Input various commands to correct the current position and adjust the volume. Thereby, the onboard equipment 2 operates according to a user's instruction. The operation switch 8 includes an erasing switch 81 as an operation device.

The display 9 has a color display such as liquid crystal or organic EL. On the screen of the display 9, a map around the current position of the vehicle is displayed at various scales, and a current location mark indicating the current position and the traveling direction of the vehicle is displayed on the map display. Further, when executing route guidance to the destination, a route guidance screen is displayed on the screen of the display unit 9.

The in-vehicle speaker 101 is connected to the voice controller 10. The audio controller 10 outputs an audio output signal to the in-vehicle speaker 101 based on the audio output signal from the control circuit 5. The sound output from the in-vehicle speaker 101 is a sound related to guidance, a sound related to operation explanation, a sound notifying that the anti-theft function is in operation, a talkback sound corresponding to a sound recognition result, and the like.

The remote control sensor 11 transmits and receives commands and the like with the remote control 111. The remote control 111 is provided with a plurality of operation switches. By operating the operation switch of the remote control 111, various command signals are transmitted from the remote control 111 via the remote control sensor 11 to the control circuit 5. The operation switch 8 and the remote controller 111 can cause the control circuit 5 to execute the same function by any operation.

The control circuit 5 displays a road map around the current location on the screen of the display 9 and overlays a current location mark indicating the current position and traveling direction of the vehicle on the road so that the vehicle can move along the travel route. To display. In this case, the display of the current location moves on the map displayed on the display 9 as the vehicle travels. The map displayed on the display 9 is scrolled according to the current position of the vehicle. At this time, the control circuit 5 performs map matching that matches the current position of the vehicle on the road.

The telematics communication device 12 is a communication device using a line such as a mobile phone network or a car phone network, and performs data communication with the first traffic information center 3.

The storage device 13 corresponds to a data storage device and a traffic information storage device. The storage device 13 is constituted by, for example, a removable flash memory card or a hard disk drive. The storage device 13 may be shared with, for example, a RAM or EEPROM provided in the control circuit 5 of the vehicle-mounted device 2 or the map data storage device 71. Further, the data storage device and the traffic information storage device may be composed of separate storage devices.

FM broadcast receiver 14 acquires traffic information transmitted in a broadcast area for FM multiplex broadcasting. The traffic information includes information such as traffic jam information, accident information, road construction, and road regulations.

The approach prediction unit 51 predicts whether or not the host vehicle approaches the guide point in a direction that sequentially passes through the guide image creation start point and the guide point. That is, the approach predicting unit 51 compares the coordinates of the current position of the host vehicle with the position (coordinates) of the guide point included in the map data, and the host vehicle guides the guidance image based on the current position of the vehicle and the traveling direction of the vehicle. Predict whether the guide point will be approached after passing through the creation start point.

The simple graphic data acquisition unit 52 may perform the first traffic information at regular intervals (at predetermined intervals, for example, every day, or once a day (for example, when the ACC switch is turned on for the first time)), or first traffic information At the timing of receiving the update notification from the center 3, the update data of the simple graphic (template) data on the guide points around the current location through telematics communication with the first traffic information center 3, and the in-vehicle device 2 do not have Guide point data around the current location (data number of the guide point, position information, simple graphic data, etc.) is acquired and stored in the map data storage 71 (simple graphic data is updated). The simple graphic data acquisition unit 52 may be configured to store the acquired guide point data (including update data) in the storage device 13.

The traffic information acquisition unit 53 receives FM multiplex broadcasting from the second traffic information center 4 when it is predicted that the host vehicle will approach the guide point in a direction passing through the guide image creation start point and the guide point in order. The latest traffic information is stored in the storage device 13. As shown in FIG. 11, the guide image creation start point is completed in the recommended display area when the guide image creation is started from the guide image creation start point when the vehicle travels at an expected speed. The distance La (distance from the guide point) that can be displayed is set. The position information of the guide image creation start point is stored in the map data storage unit 71. This distance La is set for each guide point.

The guide image creation unit 54 reads out simple graphic data and traffic information of the guide point where the approach is predicted from the map data storage unit 71 and the storage unit 13 at the timing when the host vehicle passes the guide image creation start point, A display guide image is created from the read simple graphic data and traffic information.

The drawing unit 55 causes the display 9 to display the display guide image created by the guide image creation unit 54.

The first traffic information center 3 includes a control circuit 31, a telematics communication device 32, a guide point data holder 33, and the like. The control circuit 31 is mainly composed of a microcomputer having a CPU, ROM and RAM (not shown).

The telematics communication device 32 performs data communication with the vehicle-mounted device 2 of each vehicle via a communication line such as a mobile phone network or a car phone network.

The guide point data holder 33 is composed of a storage device, and stores the position information of the guide point that is the target of guidance display, the number of the guide point data, and the simple graphic data of the guide point in association with each other. Yes.

The distribution unit 34 distributes the simple graphic data of the guide point to the vehicle-mounted device 2 via the telematics communication device 32.

The second traffic information center 4 includes a control circuit 41, a data transmitter 42, a traffic information data holder 43, a distributor 44, and the like. The control circuit 41 is mainly composed of a microcomputer having a CPU, ROM and RAM (not shown).

The data transmitter 42 transmits traffic information data to the FM broadcast station 15. The traffic information data holder 43 includes a storage device 13 and stores traffic information data.

The second traffic information center 4 communicates with other information centers 16 and 17 having a traffic information collecting function to acquire traffic information and store it in the traffic information data holder 43. The second traffic information center 4 may have a function of collecting traffic information. The distributor 44 transmits traffic information data to the FM broadcast station 15 via the data transmitter 42.

The FM broadcast station 15 provides the transmitted traffic information data as FM traffic information to the area corresponding to the traffic information as appropriate local traffic information. That is, the second traffic information center 4 provides traffic information by FM multiplex broadcasting via the FM broadcast station 15.

Next, the operation contents of the navigation system 1 configured as described above, that is, control by the control circuit 5 of the vehicle-mounted device 2, the control circuit 31 of the first traffic information center 3, and the control circuit 41 of the second traffic information center 4. The contents will be described.

Here, the flowchart described in the embodiment or the process of the flowchart includes a plurality of sections (or referred to as steps), and each section is expressed as S2, for example. Further, each section can be divided into a plurality of subsections, while a plurality of sections can be combined into one section. Further, each section can be referred to as a device, a module. In addition, each of the above sections or a combination thereof includes not only (i) a section of software combined with a hardware unit (eg, a computer), but also (ii) hardware (eg, an integrated circuit, As a section of (wiring logic circuit), it can be realized with or without the function of related devices. Furthermore, the hardware section can be included inside the microcomputer.

In FIG. 2 showing the control contents of the control circuit 5 of the on-vehicle device 2, when the ACC switch of the vehicle is turned on and the power of the on-vehicle device 2 is turned on, the on-vehicle device 2 is activated, and the control shown in FIG. Be started. In FIG. 2, it is assumed that the route to the destination is not set. First, the control circuit 5 starts host vehicle position detection by the host vehicle position detector 6 in S2. Subsequently, the process proceeds to S4, and the position information of the guide point is read (obtained) from the map data storage unit 71.

Next, the process proceeds to S60, and the approach prediction unit 51 predicts whether or not the host vehicle approaches the guide point in a direction that sequentially passes through the guide image creation start point and the guide point (approach prediction unit 51). That is, the coordinates of the current position of the host vehicle and the position (coordinates) of the guide point included in the map data are compared to predict whether the current position of the vehicle will approach the guide point in the direction passing the guide image creation start point. To do.

If “YES” is determined in S60, the process proceeds to S70, and the FM multiplex broadcast of the FM broadcast station 15 currently being broadcast is received. That is, the traffic information (congestion information) provided (transmitted, see S2040 in FIG. 4) from the second traffic information center 4 via FM multiplex broadcasting is acquired and stored in the storage device 13. In this case, when the traffic information for the guide point is not stored in the storage device 13 or when, for example, more than 5 minutes (periodic update time) have elapsed since the previous traffic information was acquired, the FM multiplex broadcasting is performed. To get traffic information. At this time, when the FM receiver is not turned on (when a CD or the like is being played back), the FM receiver is immediately turned on to start receiving the FM multiplex broadcast.

In the next S80, it is determined whether or not the host vehicle has passed the guide image creation start point. If "YES" is determined here, a display guide image is created through S90 and S100 (guide image creation unit 54). That is, in S90, the traffic information of the guidance point is read from the storage device 13 and a traffic jam image (see FIG. 7) is created. As shown in FIG. 9, the traffic information includes the link number at the guide point and the traffic information of the link indicated by the link number, for example, the traffic level information (the traffic level 1 is smooth, the traffic level 2 is congested, the traffic level 3 is traffic) Is included).

As shown in FIG. 9, a plurality of display areas in which links with a plurality of link numbers are grouped (for example, display areas NO. 1 to NO. 4) are set in the simple graphic indicated by the simple graphic data. .

As shown in FIG. 9, the guide image creation unit 54 determines the congestion level of each display area based on the congestion level information of the link number included in each display area, and corresponds to the determined congestion level. A display pattern is displayed in each display area in the simple graphic. For example, display area NO. For example, the traffic congestion level of 1 is determined by averaging the traffic congestion levels of the

link numbers

1 and 2 to obtain a traffic congestion level of 1 (which means smoothness). In addition, display area NO. The traffic congestion degree 2 is set to traffic congestion degree 1 by, for example, averaging the traffic congestion degrees 1 of the

link numbers

3, 4, and 5. In addition, display area NO. The traffic congestion degree 3 is obtained by averaging the traffic congestion degrees 2 of the

link numbers

6 and 7, for example, so that the traffic congestion degree is 2 (this means congestion). In addition, display area NO. For example, the traffic congestion degree 4 is obtained by averaging the traffic congestion degrees 3 of the

link numbers

8, 9, and 10, so that the traffic congestion degree is 3 (this means traffic congestion).

Suppose that the display patterns correspond to the

levels

1, 2, and 3 of the congestion level determined in this way. For example, when the congestion level is 1 (smooth), the display color is green, and when the congestion level is “congested”, the display color is yellow, and the congestion level is “traffic”. In this case, the display pattern is red. By making these display areas continuous according to the link, a traffic jam image at the guide point as shown in FIG. 7 is created.

Then, the process proceeds to S100 to create a display guide image (see FIG. 8) by superimposing the above-described guide image (congestion image) shown in FIG. 7 and the simple graphic based on the simple graphic data shown in FIG. . In FIG. 6 and the like, the position and road on the map are indicated by Pn (1-7) and Rn (3-4).

In the next S110, the display guide image is displayed on the display unit 9 as shown in FIG. 10 (drawing unit 55). If it is determined in S120 that the user has operated the erasure switch 81, the displayed guide image is erased.

Next, the control contents of the control circuit 31 of the first traffic information center 3 will be described with reference to FIG. In S1010, it is determined whether a data request for the guidance point data is received from the vehicle-mounted device 2. If "YES" here, the process proceeds to S1020 to obtain from the database (DB) guidance point data (such as the data number of the guidance point, position information, and simple graphic data) around the current location that the vehicle-mounted device 2 does not have. To do. In this case, the data number of the guide point held by the vehicle-mounted device 2 is included in the data request and transmitted from the vehicle-mounted device 2 to the first traffic information center 3, and the guide point data number transmitted by the vehicle-mounted device 2 and the first It is preferable that the data number of the guide point that the vehicle-mounted device 2 does not have is determined by comparing with the guide point data number that the traffic information center 3 owns. Moreover, you may comprise so that the data number of the guidance point which the onboard equipment 2 holds on the 1st traffic information center 3 side may be managed. Furthermore, when the first traffic information center 3 side has update data for the guide point data held by the vehicle-mounted device 2, it is preferable to obtain the update data of the guide point from the database.

Then, the process proceeds to S1040, and the acquired guide point data (including update data), that is, the position information of the guide point, the guide point data number, and the simple graphic data (including update data) are transmitted to the vehicle-mounted device 2.

Next, the control contents of the control circuit 41 of the second traffic information center 4 will be described with reference to FIG. First, in S2020, it is determined whether it is a periodic update time of traffic information (for example, whether 5 minutes have passed since the last update). If “YES”, the process proceeds to S2030 to create traffic information. To do. Then, it progresses to S2035 and updates delivery data based on the produced traffic information. Thereafter, in S2040, the latest distribution data (traffic information) is transmitted to the FM broadcast station 15 and transmitted (distributed) from the FM broadcast station 15 by FM multiplex broadcasting. This FM multiplex broadcast is acquired in S70 of FIG. If “NO” in S2020, S2040 is executed without executing S2030 and U35. Through the control described above, the second traffic information center 4 is configured to update the traffic information sequentially transmitted by FM multiplex broadcasting to the latest traffic information every 5 minutes (periodic update time), for example. .

The main operation of the navigation system 1 described above will be described according to the situation where the host vehicle is traveling. As shown in FIG. 11, when it is determined that the vehicle-mounted device 2 is approaching the guidance point at time t2 (ie, the host vehicle has passed the approach prediction point), the second traffic information center 4 (FM broadcasting station 15) Necessary information is extracted from the traffic information received from the FM multiplex broadcast (time t3, (traffic information acquisition point)).

Then, when the vehicle-mounted device 2 determines that the host vehicle has passed the guide image creation start point (time t4), it creates a guide image. When this guide image is created, the guide image is displayed on the display 9 (time t5). In this case, this display position is within the recommended display area, which is an area suitable as the guidance start (display start) of the guidance point.

That is, according to the present embodiment, since the simple graphic data of the guide point is stored in the map data storage unit 71 of the vehicle-mounted device 2, it has passed the guide image creation start point, which is the point where the guide image creation starts. At time t4, it is not necessary to acquire simple graphic data through telematics communication with an unstable acquisition time. For this reason, the time required for creating the guide image is short and almost constant because there are no unstable elements. Accordingly, by setting the guide image creation start point from the guide point to the above-mentioned predetermined distance La in consideration of the recommended display area, the required time until the guide image is created and displayed is initially scheduled. The display guide image for the guide point can be created based on the simple graphic data and the traffic information in a short time. Therefore, the guidance information regarding the guidance point can be reliably displayed in front of the guidance point (recommended display area). In addition, since traffic information is acquired by FM multiplex broadcasting and simple graphic data is stored in the map data storage 71, telematics communication for each guide is not necessary, which can contribute to a reduction in communication charges.

Further, in this embodiment, the simple graphic data acquisition unit 52 performs regular intervals (for example, once a day, for example, once a day (for example, an ACC switch) at a predetermined interval from the confirmation of the previous update of the guide point data. At the predetermined timing (when the first time is turned on), or the update data of the guide point data is acquired from the first traffic information center 3 at the timing when the update notification of the guide point data is received from the first traffic information center 3 Therefore, the latest guide point data (position information of the guide point, simple graphic data, etc.) can be acquired sequentially. Further, guidance point data around the current location that the vehicle-mounted device 2 does not have (such as the data number of the guidance point, position information, and simple graphic data) can be acquired from the first traffic information center 3.

In addition, by using a personal computer or a smart phone, the update data of the guide point data is downloaded and acquired from the first traffic information center 3, and the map data is obtained by connecting the personal computer or the smart phone to the navigation system 1 and using the acquired updated data. You may comprise so that the map data in the memory | storage device 71 may be updated. Further, when the map data storage 71 is a removable memory card, the memory card is accessed by a personal computer or a smartphone, and the map data in the memory card is updated based on the acquired update data. May be.

Also, when the guide point data is not included in the map data in the map data storage 71, it is preferable to provide a work menu for newly downloading the guide point data as the work menu of the navigation system 1. By executing this work menu, the guide point data around the current location is downloaded and acquired from the first traffic information center 3, and the acquired guide point data is registered in the map data in the map data storage 71. It is preferable to configure. In addition, by using a personal computer or a smartphone, the guide point data around the current location is downloaded and acquired from the first traffic information center 3, the personal computer or smartphone is connected to the navigation system 1, and the acquired guide point data is displayed on the map. You may comprise so that it may register (store) in the map data in the data memory | storage device 71. FIG. Further, when the map data storage 71 is a removable memory card, the memory card is accessed by a personal computer or a smartphone, and the obtained guide point data is registered in the map data in the memory card. Also good.

Further, in this embodiment, since the congestion degree information is acquired as the traffic information, it is possible to drive in consideration of the traveling direction of the host vehicle and the surrounding congestion degree. In this case, the traffic information may include road information such as road works and road regulations.

Further, in this embodiment, an erasing switch 81 is provided as an operating device operated by the user, and the erasing switch 8 is operated after the drawing unit 55 displays the display guide image on the display 9. Since the guide image for display is sometimes deleted, the guide image can be immediately deleted when it is determined on the user side that display of the guide image is unnecessary. Note that the guidance image may be automatically deleted at a predetermined timing (a timing set by the user or a timing uniquely set by the vehicle-mounted device 2).

Further, in this embodiment, the map data storage 71 stores a link with a link number assigned to the guide point, and the traffic congestion degree information is provided for each link of each link number and is indicated by simple graphic data. In the figure, a display area in which a plurality of links are grouped is set. Then, the guide image creation unit 54 determines the traffic level of each display area based on the traffic level information of the link number included in each display area, and has a display pattern corresponding to the determined level of the traffic level. The display pattern is displayed in each display area corresponding area in the simple graphic.

According to this, since the congestion level can be displayed for each display area in which a plurality of links are grouped, the display is not too fine as compared with the case where the congestion level is displayed for each link, and it is easy to understand.
(Second embodiment)
FIG. 12 is a flowchart showing the second embodiment of the present disclosure, and shows the contents of the control of the simple graphic data acquisition unit 52 of the vehicle-mounted device 2, that is, the update control of the guide point data. First, in S250 of FIG. 13, it is determined whether, for example, one day or more has passed since the previous update confirmation (a preset interval or a predetermined timing). If YES here, the vehicle-mounted device 2 transmits a data request for the guide point data to the first traffic information center 3 in S260. This data request includes update request information for the guide point data (guidance point data number, guide point position information, and simple graphic data related to the guide point) held by the vehicle-mounted device 2. By this data request, it is determined that the first traffic information center 3 has received the data request in S1010 of FIG. 3, and the first traffic information center 3 transmits the guide point data in S1040 of FIG. .

In the next S270, it is determined whether or not the guide point data is received from the first traffic information center 3 by telematics communication. If it is determined that the guidance point data has been received, the process proceeds to S280, and the received guidance point data (including the updated data and the guidance point data around the current location not owned by the vehicle-mounted device 2) is stored in the map data storage unit 71. To do. Thereby, with respect to the map data in the map data storage device 71, the update process of the guide point data and the new registration process of the guide point data not registered in the map data are executed.

If “NO” in S250, it is determined whether or not an update notification from the first traffic information center 3 is received in S255. Here, when the update notification is received, the process proceeds to S260, and the above-described processes are executed.

The configuration of the second embodiment other than that described above is the same as the configuration of the first embodiment. Therefore, also in the second embodiment, substantially the same operational effects as in the first embodiment can be obtained.

Although the present disclosure has been described with reference to the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.

Claims

A first traffic information center (3) for providing simple graphic data relating to a guide point by telematics communication, a second traffic information center (4) for providing traffic information by FM multiplex broadcasting, and the first traffic information center mounted on a vehicle. A vehicle-mounted device (2) capable of telematics communication with the traffic information center of the second and capable of receiving FM multiplex broadcasting from the second traffic information center,
The on-vehicle device (2)
An indicator (9);
A host vehicle position detector (6) for detecting the position of the host vehicle;
A map data storage (71) storing map data including position information of the guide point, simple graphic data relating to the guide point, and position information of a guide image creation start point set before the guide point;
An approach prediction unit (51) for predicting whether or not a host vehicle is approaching the guide point in a direction passing through the guide image creation start point and the guide point in order;
The traffic information received by the FM multiplex broadcast from the second traffic information center (4) when the approach prediction unit (51) predicts that the host vehicle is approaching the guide point is traffic information. A traffic information acquisition unit (53) stored in the storage device (13);
At the timing when the host vehicle passes the guide image creation start point, simple graphic data of the guide point where the approach is predicted is read out from the map data storage (13) and the approach from the traffic information storage (13). A guide image creation unit (54) that reads out traffic information of a guidance point where the vehicle is predicted and creates a display guide image from the read simple graphic data and the traffic information;
A navigation system comprising a drawing unit (55) for displaying the display guide image created by the guide image creation unit (54) on the display (9).
With respect to the simple graphic data relating to the guide point stored in the map data, at a preset interval or at the timing when the update notification of the simple graphic data is received from the first traffic information center (3). In the telematics communication with the first traffic information center (3), it is confirmed whether or not the simple graphic data relating to the guide point is updated, and if there is update data, it is acquired and stored in the map data storage (71). The navigation system according to claim 1, further comprising a simple graphic data acquisition unit (52).
The navigation system according to claim 1 or 2, wherein the traffic information is congestion degree information.
Furthermore, an operating device (81) operated by the user is provided,
The said drawing part (55) deletes the said guide image for a display, when the said operation device (81) is operated, after displaying the guide image for a display on the said indicator (9). The navigation system according to any one of the above.
The map data storage unit (71) stores a link with a link number for the guide point,
The congestion level information is provided for each link of each link number,
In the simple graphic shown by the simple graphic data, a display area in which links of a plurality of link numbers are grouped is set,
The guide image creation unit (54) determines the traffic level of each display area based on the traffic level information of the link number included in each display area, and displays the display pattern corresponding to the determined level of the traffic level. 4. The navigation system according to claim 3, wherein the navigation system displays the information in each display area in a simple graphic.