JP2008039678A - Car navigation apparatus and display method thereof - Google Patents

Abstract

In a display method of a car navigation device, a user interface with high visibility is provided even within a limited display screen so that a traffic situation and a speed difference in a road section can be understood instantly.
A car navigation device acquires a current position of a host vehicle from a sensor, receives traffic information from outside the vehicle by wireless communication, receives traffic information from outside the vehicle by wireless communication, and based on the received traffic information A traffic volume and a vehicle traveling speed for each road section are generated. The traffic situation on each road is represented by a point sequence on the road, and a point sequence corresponding to the unit travel amount based on the traffic density for each road section and the vehicle travel speed is displayed on the map image. The degree of traffic congestion is expressed by the point sequence density, and the vehicle travel speed is expressed figuratively by the moving speed of the point sequence of the animation in which the point sequence moves.
[Selection] Figure 1

Description

  The present invention relates to a car navigation device and a display method thereof, and more particularly, to a car navigation device and a display method thereof that are excellent in visually recognizing road traffic information and suitable for displaying a map image for appropriately selecting a destination.

  In current car navigation devices, it is possible to acquire traffic information such as road congestion using wireless communication means such as VICS (Vehicle Information and Commnication System).

  It is also possible to accumulate past traffic information in advance in the HDD inside the car navigation device and statistically present the traffic conditions to the driver.

  Such traffic information can be superimposed and displayed on a map on the screen of the car navigation device. In an existing car navigation device, for example, traffic information is indicated by an arrow beside a road displayed on the screen, and depending on the degree of congestion, the traffic information is colored red if it is congested, yellow if it is congested, and green if it is smooth. The congested section is displayed with the length of the arrow line segment. If the congested section is short, the line segment is displayed along the road, and if the congested section is long, the line segment is displayed along the road.

  In this display method, two traffic information display lines are displayed bi-directionally for each road, so that the screen display becomes complicated when displayed in urban areas where roads are complicated. Since the screen display area and the screen resolution of the car navigation device are limited, the visibility is greatly reduced.

  In urban areas, a wide range of roads may be displayed as being congested, and there is a problem that it is impossible to determine which road is flowing faster.

  In addition, there is a problem that even if the road is displayed as smooth, it is impossible to know the traveling speed of a vehicle that actually travels on the road.

  In order to solve such a problem, the following Patent Document 1 discloses a method of storing a traffic jam display every few minutes and displaying a time-dependent change of the traffic jam in an animation. With this method, it is possible to understand at a glance whether a certain route is in a traffic jam tendency or a cancellation tendency.

  Further, Patent Document 2 below proposes a method in which the moving speed of a road section is expressed as, for example, “30 km / h”. This makes it possible to accurately understand the speed of the road flow.

Japanese Patent No. 8-287392 JP 2001-289649 A

  The car navigation device according to Patent Document 1 of the above-described prior art can grasp a change with time of traffic jam information, but has a problem that it cannot understand the movement status of each vehicle at a glance. Moreover, in patent document 2, in order to understand the speed for every road section, since it is necessary to look for the location where the number on the map was written, there exists a problem that a screen must be watched for a long time. Furthermore, the above-mentioned prior art is a technology that supports the selection of the optimum route for reaching the destination by indicating the destination and instantly understanding the traffic situation and speed difference of the road section. Not disclosed.

  The present invention has been made to solve the above-described problems, and its purpose is to provide a highly visible user interface even within a limited display screen, so that the traffic situation in a road section can be instantaneously determined. It is an object of the present invention to provide a display method for a car navigation device that can understand a speed difference.

  In the car navigation device of the present invention, the current position of the host vehicle is acquired from the sensor, and traffic information is received from outside the vehicle by wireless communication. A mark representing the current position of the vehicle is superimposed on the map image displayed by the car navigation device.

  The car navigation device of the present invention receives traffic information from outside the vehicle by wireless communication, and generates a traffic volume and a vehicle traffic speed for each road section based on the received traffic information.

  The traffic situation on each road is represented by a point sequence on the road. Then, in the map image, the point sequence density according to the traffic volume for each road section and the unit travel amount of the point sequence according to the unit travel amount based on the vehicle travel speed are obtained, and the congestion degree due to the traffic volume is calculated by the point sequence density. The vehicle travel speed is expressed metaphorically by the moving speed of the point sequence of the animation in which the point sequence moves.

  According to the present invention, it is possible to provide a display method of a car navigation device that provides a highly visible user interface even within a limited display screen and can instantly understand the traffic situation and speed difference in a road section. Can do.

  Embodiments according to the present invention will be described below with reference to FIGS.

Embodiment 1
A first embodiment according to the present invention will be described below with reference to FIGS.

First, the configuration of the car navigation apparatus according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 5.
FIG. 1 is a block diagram showing the overall configuration of the car navigation device according to the first embodiment of the present invention.
FIG. 2 is a block diagram illustrating an internal configuration of the navigation information generation unit 400.
FIG. 3 is a block diagram illustrating an internal configuration of the image information generation unit 700.

  As shown in FIG. 1, the car navigation device 1000 of the present invention is a device that is mounted on a vehicle (shown as the own vehicle 500 in FIG. 1), and includes a radio reception unit 100, a traffic information generation unit 200, navigation information. A generation unit 400, a display unit 600, and an image information generation unit 700 are included.

  The wireless reception unit 100 receives road traffic information from a server or the like that manages external traffic information. That is, the wireless reception unit 100 receives “road section ID”, the time required to travel on the road corresponding to the road section ID, and the traffic volume of the road corresponding to the road section ID as road traffic information. .

  Based on the traffic information received by the wireless reception unit 100, the traffic information generation unit 200 generates a traffic speed and a point sequence density for generating a point sequence speed for image display corresponding to a certain road section ID. Generate traffic for. For the traffic volume for generating the point sequence density generated by the traffic information generation unit 200, the traffic volume received by the wireless reception unit 100 may be used as it is, or processing such as dividing by the number of lanes on the road is performed. May be.

  The navigation information generation unit 400 generates the vehicle speed, the vehicle position, and the map information from the sensor information. The display unit 600 is a display device represented by an LCD display, for example. Then, the image information generation unit 700 superimposes the map information acquired by the navigation information generation unit 400 and the traffic information acquired from the wireless communication unit 100 and the traffic information generation unit 200 and displays them on the display unit 600.

  As shown in FIG. 2, the navigation information generation unit 400 includes a vehicle speed sensor 401, a GPS (Global Positioning System) 402, a gyro sensor 403, a map information recording unit 404, an information generation unit 405, and a buffer 406.

  The vehicle speed sensor 401 measures the vehicle wheel rotation speed in order to obtain the vehicle speed. The GPS 402 uses, for example, an artificial satellite to acquire location information about where the vehicle is on the earth. The gyro sensor 403 is a device that detects the traveling direction of the vehicle. The map information recording unit 404 records map information for displaying the current location and the destination. The information generation unit 405 acquires the own vehicle speed, the own vehicle position, and the display screen data. The buffer 406 is an area for temporarily storing sensor information detected by the information generation unit 405 from the vehicle speed sensor 401 and position information acquired from the GPS 402.

  As shown in FIG. 3, the image information generation unit 700 includes a map information storage unit 701, a traffic information storage unit 702, an on-screen movement amount table storage unit 703, a point sequence density table storage unit 704, and a host vehicle information storage unit. 705, an image generation unit 706, a drawing buffer 707, and a point sequence display information storage unit 708.

  The map information storage unit 701 stores the vehicle position vicinity map information acquired from the navigation information generation unit 400. The traffic information storage unit 702 stores the traffic speed for each road section and the traffic volume for each road section generated by the traffic information generation unit 200.

  In the on-screen movement amount table storage unit 703, the on-screen movement amount of the point sequence to be displayed is set from the traffic speed. The point sequence density table storage unit 704 stores a table for setting the point sequence density for image generation. The own vehicle information storage unit 705 stores the own vehicle information generated by the navigation information generation unit 400. The image generation unit 706 generates image information to be displayed on the display unit 600 from the acquired information. The drawing buffer 707 is an area for temporarily storing drawing data. The point sequence display information storage unit 708 stores the point sequence display information generated by the image generation unit 706. This point sequence display information storage unit 708 also stores parameters such as the number of point sequence movement display times and the point sequence display switching time used when performing the movement display of the point sequence.

Next, the data structure of the car navigation apparatus according to the first embodiment of the present invention will be described with reference to FIGS.
FIG. 4 is a diagram illustrating a data structure of map data stored in the map information storage unit 701.
FIG. 5 is a diagram illustrating a data structure of traffic information data stored in the traffic information storage unit 702.
FIG. 6 is a diagram showing a structure of own vehicle information data stored in the own vehicle information storage unit 705.

  Map data is memorize | stored in the map information storage part 701, and has road area ID, a start point coordinate, and an end point coordinate as an element for every road area, as FIG. 4 shows. The start point coordinates and end point coordinates are position information indicating where on the two-dimensional coordinates the road is located.

  The traffic information data is stored in the traffic information storage unit 702, and as shown in FIG. 5, each road section has a road section ID, traffic speed information, and traffic volume information as elements.

  The own vehicle information data is stored in the own vehicle information storage unit 705, and as shown in FIG. 6, has own vehicle position coordinates, road section position, speed, and direction as elements.

  Next, processing of the car navigation device according to the first embodiment of the present invention will be described with reference to FIGS.

  First, a process in which the navigation information generation unit 400 generates the vehicle position on the map will be described with reference to FIG.

  FIG. 7 is a flowchart showing a process in which the navigation information generation unit 400 generates the vehicle position on the map.

  The vehicle speed sensor 401, the GPS 402, and the gyro sensor 403 of the navigation information generation unit 400 shown in FIG. 2 periodically acquire information about the own vehicle 500 and store it in the buffer 406 of the information generation unit according to the procedure shown below. Remember.

  First, the information generator 405 calculates the vehicle position coordinates from the detected GPS information (step S410).

  Next, the host vehicle speed is acquired from the vehicle speed sensor 401 (step S420).

  Next, the vehicle traveling direction is acquired from the gyro sensor 403 (step S430).

  Next, road map information around the vehicle position is acquired from the map information storage unit 404 (step S440).

  Next, the position on the road on which the vehicle 500 is traveling is calculated from the trajectory of the vehicle 500 and the surrounding road map information stored in the buffer 406. A pattern matching process is used for the calculation. The calculated position is set as the own vehicle position on the road map (step S450).

  Steps S410 to S450 are executed at a frequency of several times per second during traveling.

  Then, the host vehicle information data shown in FIG. 6 is stored in the host vehicle information storage unit 705 of the image information generation unit 700 shown in FIG.

  Next, processing of the image generation unit will be described with reference to FIGS. 7 and 10 to 13.

First, an outline of the processing of the image generation unit will be described with reference to FIGS. 12 and 13.
FIG. 12 is an example of a screen that the image generation unit 706 switches and displays on the display unit 600 for each point sequence display switching time.
FIG. 13 is an example of traffic information and a map for explaining an example of a screen displayed on the display unit 600 by the image generation unit 706.

  When the image generation unit 706 shown in FIG. 3 detects a congested part in the map image displayed on the display unit 600 from the traffic information acquired from the traffic information generation unit 200, the congestion state is represented by a point sequence as shown in FIG. indicate.

  Further, it is assumed that the speed of the corresponding section and the traffic volume are as shown in FIG.

  That is, when the own vehicle 500 stops at the section d5-d6, the traffic speed of the section d1-d2 is M [km / h], the traffic volume is x [vehicle / h], and the traffic speed of the section d3-d4 is N. [Km / h], traffic volume is y [car / h], traffic speed in the section d5-d6 is L [car / h], traffic volume is z car / h, M> L> N, x It is assumed that there is a relationship of> y.

  At this time, the area around the section d1-d2 where the traffic volume is high is displayed so that the point sequence density increases as shown in the display (a) P1 of FIG. 12, and the area around the d3-d4 where the traffic volume is low is shown in FIG. Display (a) Display is made so that the density of the point sequence is reduced as in P2.

  In addition, the image generation unit 706 switches the display (a), (b), and (c) of FIG. 12 to continuously display the point sequence on the display unit 600 so that the point sequence appears to move.

  When the moving speed of the point sequence is fast, the speed of the vehicle running on the road is fast, and when the speed is slow, the running speed of the vehicle running on the road is slow due to congestion or the like. At this time, the movement amount W1> W2 of the unit time of the point sequence is established in the display (b) of FIG.

Next, the image generation processing of the image generation unit 706 will be described in order with reference to FIGS. 8, 10, and 11.
FIG. 8 is a flowchart illustrating image generation processing of the image generation unit 706.
FIG. 10 is a graph showing the relationship between the speed and the movement amount on the movement amount table on the screen.
FIG. 11 is a graph showing the relationship between the traffic volume and the point sequence density on the point sequence density table.

  First, the image generation unit 706 shown in FIG. 3 cuts out necessary portions from the map information storage unit 701 as rectangular image data in accordance with the screen size displayed on the display unit 600 (step S701). The point sequence image generated by the following processing is displayed superimposed on the main image.

  Next, processing S702 in which the image generation unit 706 acquires section information from traffic information stored in the traffic information storage unit will be described.

  First, before the process S702 of the image generation unit 706, the traffic information generation unit 200 performs the following processing.

  When traffic information transmitted from an external traffic server or the like is received from the wireless receiving unit 100, the traffic information generating unit 200 acquires a road section ID that identifies a road section and section required time information indicating a required time. Then, the traffic information generation unit 200 calculates the traffic speed in the received road section from the section distance corresponding to the road section ID and the required time, and stores the calculated traffic speed together with the road section ID in the traffic information storage unit 702. .

  The section distance corresponding to the road section ID may be calculated by the traffic information generation unit 200 by reading the map information in the map information storage unit 701 in the image information generation unit 700 shown in FIG. Alternatively, the section distance corresponding to the road section ID may be received from the outside and stored in the traffic information storage unit 702 in association with the road section ID.

  In addition, the traffic information generation unit 200 receives the vehicle traffic information from the radio reception unit 100 and stores it in the traffic information storage unit 702 as traffic information for each road section ID.

  Then, the image generation unit 706 reads out traffic speed information and traffic volume information corresponding to the road section ID corresponding to the road section to be obtained from the traffic information storage unit 702 (step S702).

  Next, the image generation unit 706 is based on the information in the map information storage unit 701, the traffic information storage unit 702, the on-screen movement amount table storage unit 703, the point sequence density table storage unit 704, and the own vehicle information storage unit 705. Generate an image.

  The image generation unit 706 refers to the point sequence density table having the relationship as shown in FIG. 11 based on the traffic volume information read from the traffic information storage unit 702, and sets the point sequence density to be displayed ( Step S703).

  For example, since the point sequence density in the section d1-d2 is the traffic volume x [unit / h] in the section d1-d2, as shown in FIG. 11, it is obtained as P1, and the point sequence density in the section d3-d4 is From the traffic volume y [unit / h] of d3-d4, P2 is obtained from FIG.

  Next, the movement amounts W1 and W2 per point sequence movement display switching time when the display sequence of the point sequence shown in the display (a) of FIG. 12 and the display (b) of FIG. 12 is performed are calculated (step S704). .

  The process of step S704 calculates the difference between the reference speed acquired by the image generation unit 706 by the reference speed acquisition process and the section speed, and calculates the difference based on the on-screen movement amount table having the relationship shown in FIG. . The reference speed acquisition process will be described later in detail with reference to FIG.

When the reference speed and the section speed are obtained, the difference between the reference speed and the traffic speed on the horizontal axis is as shown in the following (Equation 1) from FIG. 10, and the movement amount W1 of the section d1-d2 is obtained.
| Reference speed−Section traffic speed | = | LM− = r (Formula 1)
Similarly, the movement amount W2 of the section d3-d4 is also obtained from the difference r between the reference speed and the traffic speed.

  Next, the calculated density and movement amount are stored in the on-screen movement amount table storage unit 703 and the point sequence density table storage unit 704, together with the section ID (step S705).

  Next, the point sequence is superimposed on the map displayed on the display unit 600 based on the set point sequence density for each interval and the interval information stored in the map information memory (step S706).

  As shown in the display (a) of FIG. 12, the display content is a point sequence having a narrow interval in the section d1-d2 and a point sequence having a wide interval in the d3-d4. The position information of the displayed point sequence is stored in the point sequence display information storage unit 708 for the next screen generation (step S707).

  The image generation unit 706 counts up the number of point sequence movements (step S708), and checks whether or not the next screen generation of the specified number of times has been performed (step S709).

  If the specified number of times has not been reached, the displayed point sequence position is moved (step S710). If the specified number of times has been reached, the number of point row movements is reset, and the point row position is set to the initial display position (step S711).

  The next screen is displayed by using the position information of the point sequence stored in the point sequence display information storage unit 708 and moving the point sequence. As the movement amount in each section, the values (W1, W2) set in step S704 are used.

  As for the display timing, after the display (a) of FIG. 12 is displayed, the next screen is displayed after the point sequence movement display switching time set in the point sequence display information storage unit 708 in advance.

  By switching and displaying the images to be displayed every unit time in this way, the point sequence is moved and displayed.

  Finally, an inquiry is made as to whether there is new traffic information, and if there is, the process returns to step S702. If not, the process returns to step S706, and the display (a) in FIG. 12, the display (b) in FIG. 12, and the display (c) in FIG. 12 are repeated (step S712).

Next, reference speed acquisition processing performed by the image generation unit 706 will be described with reference to FIG.
FIG. 9 is a flowchart illustrating a reference speed acquisition process performed by the image generation unit 706.

  First, the image generation unit 706 shown in FIG. 3 acquires the vehicle speed from the vehicle information storage unit 705, and investigates whether or not the vehicle is stopped (step S031).

  If the vehicle is traveling, the vehicle speed is set as the reference speed (step S032).

  If the vehicle is stopped, it is investigated whether the traffic information of the currently traveling section d5-d6 is provided in the information received from the wireless communication unit 100 (step S033).

  If provided, the traffic speed of the currently traveling section is set as the reference speed (step S035).

  If it is not provided, the traffic speed in a nearby section that is currently running is acquired.

  Next, movement amounts W1 and W2 shown in FIG. When the host vehicle is stopped, the reference speed is L [km / h] because it is the traffic speed of the currently traveling section.

  As described above, according to the first embodiment of the present invention, it becomes possible to easily grasp the traffic volume and the flow of the road from the traffic speed and the traffic volume of the road, and the driver selects an appropriate route. It becomes possible.

  When the image generation unit 706 displays the point sequence movement, the point sequence movement amounts W1 and W2 may be changed according to the scale of the map image to be displayed. In other words, in wide area display, the section length of the road on the map to be displayed is also shortened, so the point sequence movement amount is set small, and in enlarged display, the point sequence movement amount is set large so that it corresponds to the display magnification. It is possible to move and display the point sequence.

  In addition, the reference speed acquired by the process of the flowchart of FIG. 9 of the present embodiment is the traffic speed of the traveling route or the traffic speed in the vicinity section when the own vehicle 500 is stopped. The reference speed when the car 500 is traveling is the own vehicle speed while traveling, and the amount of movement when the point sequence is displayed is obtained from (Equation 1) by the relative speed of the own vehicle speed and the section traffic speed. Therefore, when driving, an appropriate speed is presented from the car navigation device for judgment from the screen.

[Embodiment 2]
Hereinafter, a second embodiment according to the present invention will be described with reference to FIGS.

  The car navigation device of this embodiment is obtained by adding a function of selecting a destination and selecting an appropriate route to the car navigation device of the first embodiment.

  In the following, the configuration and processing that are different from the car navigation apparatus of the first embodiment will be mainly described.

First, the configuration of the navigation information generation unit 410 according to the second embodiment of the present invention will be described using FIG.
FIG. 14 is a block diagram illustrating a configuration of the navigation information generation unit 410 according to the second embodiment of this invention.

  As shown in FIG. 14, the navigation information generation unit 410 of the present embodiment includes a route information storage unit in addition to a vehicle speed sensor 401, a GPS 402, a gyro sensor 403, a map information recording unit 404, an information generation unit 405, and a buffer 406. 407 and a destination setting unit 408.

  401 to 406 have the same functions as the navigation information generation unit 410 of the first embodiment shown in FIG. The route information storage unit 407 records the route from the vehicle position to the destination. The destination setting unit 408 sets the input destination.

First, a process in which the image generation unit 200 issues a route re-search request to the navigation information generation unit 410 will be described with reference to FIGS. 15, 17, and 20.
FIG. 15 is a processing flow until the image generation unit 706 issues a reroute search request.
FIG. 17 is a screen example displaying the route guidance information generated by the navigation information generation unit 410.
FIG. 20 is an example of traffic information and a map for explaining an example of a screen displayed on the display unit 600 by the image generation unit 706.

  The destination is set in advance by the driver at the point G on FIG. 20 using the destination setting unit 408, and the route to the destination is determined by the navigation information generation unit 410 at points d5-d6, d1-d2, on FIG. The route information having the content via d9-d10 is stored in the route information storage unit 407. The traffic information acquired at the time of destination setting is as shown in FIG. 20, and the required times for d1-d2, d9-d10 are j minutes, f minutes, and the required times for sections d7-d8, d3-d4, respectively. Minutes and h, and (g + f) <(j + h). FIG. 17A shows that the shortest route is the route d5-d6, d1-d2.

  When the image generation unit 706 receives the road section ID and the section required time information from the traffic information generation unit 200 (step S201), the image generation unit 706 determines whether the received traffic information is updated with reference to the time stamp ( Step S202).

  When the traffic information is updated data, the section required time information is compared for each road section ID. As a result of the comparison, it is investigated whether or not there is a change by a predetermined threshold A or more in each section (step S203).

  Here, when it is detected that the sections d1-d2, d9-d10, d7-d8, d3-d4 have changed to g ′ minutes, f ′ minutes, j ′ minutes and h ′ minutes, the traffic information storage unit 702 is stored. It updates (step S204) and makes a reroute search processing request to the navigation information generating unit 410 (step S205).

Next, with reference to FIG. 16 to FIG. 19, the navigation information generation unit 410 will explain the reroute search process for performing the shortest route guidance to the driver.
FIG. 16 is a flowchart showing the most route search process performed by the navigation information generation unit 410.
FIG. 18 is a screen example in which the reroute information generated by the navigation information generation unit 410 and the point sequence generated by the image generation unit 706 are superimposed and displayed on a map.
FIG. 19 is a screen example in which the reroute information generated by the navigation information generation unit 410 and the car mark generated by the image generation unit 706 are switched and displayed on the display unit 600 every unit time.

First, when receiving the reroute search processing request from the image generation unit 706, the information generation unit 405 illustrated in FIG. 14 acquires the traffic information of the road section ID whose section required time information has changed (step S401).
Next, the information generation unit 405 investigates whether or not the changed road section is on the route guiding the host vehicle 500 (step S402), and if it exists, performs a reroute search (step S403). . When the destination is outside the traffic information provision range, the route search is performed on the range obtained by the traffic information, and the route outside the provision range is used as it was before.

  As a result of the reroute search, the time required for each section of the road section shown in FIG. 20 changes from (g + f) <(j + h) to (g ′ + f ′)> (j ′ + h ′), and the route via the shortest path is d1. -D2, d9-d10 are changed to d7-d8, d3-d4, and the shortest path is changed from FIG. 17 (a) to FIG. 17 (b).

  Next, the information generation unit 405 compares the result of the route search in step S403 with the route information storage unit 407, and investigates whether there is a change in the shortest route (step S404).

  If there is a change in the shortest route in step S404, the image generation unit 706 is notified as reroute candidate information (step S405).

  When the image generation unit 706 receives the reroute information from the information generation unit 405, the image generation unit 706 performs the image generation processing described in the first embodiment, and reroute candidate routes (d7-d8, d3-d4) and the original route The point string is moved and displayed for (d1-d2, d9-d10). In addition, a dialog prompting the driver to change the route is displayed. That is, as shown in the screen example shown in FIG. 18, when the traffic situation changes and the shortest route is changed, a dialog is displayed with an animation that moves the point sequence, and the route change is displayed to the driver. To encourage.

  In this embodiment, a change in road traffic information is detected based on the time required for each road section. However, the comparison method is not absolute time, and a speed such as a 10% average speed reduction may be used.

  In the example of FIG. 18, the superimposed image is a point sequence. However, as shown in FIG. 19, the car mark is displayed for each route, and the display (a) of FIG. 19 is displayed according to the required time to the destination. ), An animation display may be performed by switching the display (b) in FIG. 19 and the display (c) in FIG.

  As described above, according to the second embodiment of the present invention, when the shortest route changes due to a change in traffic conditions, the time required for the pre-change route and the post-change route can be calculated from the road speed and traffic volume. The difference can be easily grasped, and the driver can select an appropriate route.

  In the present embodiment, when the image generation unit 706 detects that the shortest route has changed due to a change in traffic conditions, the image generation unit 706 operates to perform point sequence movement display on the route set as the destination and the reroute candidate route. However, the point sequence movement display may be performed when the candidate route is set by the destination setting of the driver.

1 is a block diagram illustrating an overall configuration of a car navigation device according to a first embodiment of the present invention. 3 is a block diagram showing an internal configuration of a navigation information generation unit 400. FIG. 3 is a block diagram illustrating an internal configuration of an image information generation unit 700. FIG. It is a figure which shows the data structure of the map data memorize | stored in the map information storage part. It is a figure which shows the data structure of the traffic information data memorize | stored in the traffic information storage part. It is a figure which shows the structure of the own vehicle information data which the own vehicle information storage part 705 memorize | stores. It is a flowchart which shows the process in which the navigation information generation part 400 produces | generates the own vehicle position on a map. 5 is a flowchart illustrating image generation processing of an image generation unit 706. It is a flowchart which shows the reference speed acquisition process which the image generation part 706 performs. It is a graph which shows the relationship between the speed on a movement amount table on a screen, and a movement amount. It is a graph which shows the relationship between the traffic on a point sequence density table, and a point sequence density. It is an example of a screen that the image generation unit 706 switches and displays on the display unit 600 every point sequence movement display switching time. 5 is an example of traffic information and a map for explaining a screen example displayed on the display unit 600 by the image generation unit 706 in the first embodiment of the present invention. It is a block diagram which shows the structure of the navigation information generation part 410 of 2nd embodiment of this invention. This is a processing flow until the image generation unit 706 issues a reroute search request. It is a flowchart which shows the most route search process which the navigation information generation part 410 performs. It is the example of a screen which displayed the route guidance information which navigation information generation part 410 generates. It is an example of a screen in which the reroute information generated by the navigation information generation unit 410 and the point sequence generated by the image generation unit 706 are superimposed on the map. This is a screen example in which the reroute information generated by the navigation information generation unit 410 and the car mark generated by the image generation unit 706 are switched and displayed on the display unit 600 every unit time. It is an example of the traffic information and map for demonstrating the example of a screen which the image generation part 706 displays on the display part 600 in 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Wireless communication part 200 ... Traffic information generation part 400 ... Navi information generation part (the 1)
500 ... host vehicle 600 ... display unit 700 ... image information generation unit 1000 ... car navigation device 401 ... vehicle speed sensor 402 ... GPS
403 ... Gyro sensor 404 ... Map information recording unit 405 ... Information generation unit 406 ... Buffer 407 ... Route information storage unit 408 ... Destination setting unit 410 ... Navi information generation unit (2)
701 ... Map information storage unit 702 ... Traffic information storage unit 703 ... On-screen movement amount table storage unit 704 ... Point sequence density table storage unit 705 ... Own vehicle information storage unit 706 ... Image generation unit 707 ... Drawing buffer 708 ... Point sequence Display information storage

Claims (10)

Current position acquisition means for acquiring the current position of the host vehicle from the sensor information;
Road map storage means for storing road map information;
Image generating means for generating a map image in which the map information acquired from the road map storage means and a mark representing the current position of the vehicle acquired by the current position acquiring means are superimposed;
Display means for displaying the map image generated by the image generation means;
A communication means for receiving traffic information from outside the vehicle by wireless communication;
Traffic information generating means for receiving traffic information from the communication means and generating a vehicle traffic speed for each road section;
The image generating means generates an image pattern indicating speed information for each road section from the vehicle traffic speed generated by the traffic information generating means, and displays the vehicle traffic speed for each road section superimposed on the road of the map image. Car navigation apparatus characterized by that.   The image generation unit calculates a unit time movement amount of the vehicle for each road section on the display screen from the vehicle traffic speed generated by the traffic information generation unit, and displays a plurality of map images for displaying the unit time movement amount. 2. The car navigation device according to claim 1, wherein the car navigation device is switched at regular intervals, and the vehicle travel speed for each road section is dynamically displayed by superimposing the map image on the road.   3. The car navigation apparatus according to claim 2, wherein the unit time movement amount calculated by the image generation unit is calculated according to a scale of a map screen displayed by the display unit.   The plurality of map images indicating the movement of the vehicle for each road section displayed on the display means by the image generation means are images displaying a point sequence having a movement amount corresponding to a unit time movement amount for each road section. The car navigation device according to claim 2. Current position acquisition means for acquiring the current position of the host vehicle from the sensor information;
Road map storage means for storing road map information;
Image generating means for generating a map image in which the map information acquired from the road map storage means and a mark representing the current position of the vehicle acquired by the current position acquiring means are superimposed;
Display means for displaying the map image generated by the image generation means;
A communication means for receiving traffic information from outside the vehicle by wireless communication;
Traffic information generating means for receiving traffic information from the communication means and generating traffic volume for each road section;
The car navigation device characterized in that the image generation means generates an image pattern from the traffic volume generated by the traffic information generation means and superimposes the map image on a road to display the traffic volume for each road section.   6. The car navigation apparatus according to claim 5, wherein the map image displayed on the display means by the image generating means is an image displaying a point sequence having a point sequence density corresponding to a traffic volume for each road section. . Furthermore, destination input means for setting the destination,
Route setting means for generating route information from the current position acquired by the current position acquisition means to the destination input from the destination input means;
The image display means dynamically displays a unit movement amount of the vehicle for each road section on a road on the route generated by the route setting means at the time of destination setting by switching a plurality of images on the display means. The car navigation device according to claim 2. When the traffic information generating means detects a change in traffic conditions in a road section on a traveling route, when a route search request is made to the route setting means and new route information different from the current route is acquired Is
The image display means dynamically displays a unit movement amount of a vehicle for each road section on a road having new route information and a road on the current route by switching a plurality of map images on the display means. The car navigation device according to claim 7.   The position at a certain time when the vehicle travels based on the unit movement amount of the vehicle for each road section is compared with the road having the new route information and the road on the current route as a mark. The car navigation device according to claim 7, wherein: In the display method of the car navigation device that acquires the current position of the host vehicle from the sensor, receives traffic information from the outside of the vehicle, and displays a mark representing the current position of the host vehicle superimposed on the map image.
Obtaining a current position of the vehicle from the sensor;
Receiving the traffic information from outside the vehicle by the wireless communication;
Generating traffic volume and vehicle traffic speed for each road section based on the received traffic information;
A point sequence having a point sequence density corresponding to the traffic volume for each road section and a unit travel amount of the point sequence corresponding to the unit travel distance based on the vehicle traveling speed is displayed for each road section on the map image. Steps,
And a method of dynamically switching and displaying the map images for each of a plurality of map images.

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