JPH09133538A - On-vehicle navigation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically change a display showing a wide-area traffic information to one showing for a narrow-area traffic information without user's changing operation of communication medium when a narrow-area information is received while the wide-area road traffic information is shown on the display. SOLUTION: A CPU 10 draws a road traffic information picture in a second video RAM 14 on the basis of the road traffic information received by an FM multiple broadcasting receiver 4 and outputs it to an indicator 8 through a synthesizing circuit 16 so as to indicate it thereon. When a radio becon is received by a radio becon receiver 5, the CPU 10 draws a road traffic information picture in the RAM 14 on the basis of the road traffic information received through the radio becon, and it outputs it to the indicator 8 through the circuit 16 so as to indicate it thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted navigation device, and more particularly to a wide area road traffic information and a narrow area road traffic information from a VICS center or the like through a plurality of communication media such as FM multiplex broadcasting, radio wave beacons and optical beacons. The present invention relates to a vehicle-mounted navigation device capable of receiving both of them and switching to a display device for display.

[0002]

2. Description of the Related Art A vehicle-mounted navigation device detects a vehicle position by satellite navigation or self-contained navigation, reads map information around the vehicle position from a map information storage medium such as a CD-ROM, and maps the vehicle position by map matching. By correcting the above and drawing a map image on the screen with the vehicle position mark, the correct vehicle position on the map can be known (navigation function). The map information is prepared in scale levels 1 to 7 or 8 for each area, and the scale level desired by the user can be selected.
Scale level 1 is a national map, and map information for scale level 2 is 580km x 700km vertically and horizontally on the screen, and scale level 3 is 150k.
m x 180km, scale level 4 is 70km x 90km, scale level 5
Is used to display a map image of 18km x 22km, scale level 6 is 9km x 11km, scale level 7 is 2.2km x 2.8km, and scale level 8 is 1.1km x 1.4km.

In the map information, the road is defined by polygonal line approximation, and the longitude coordinates and latitude coordinates of the vertices of the polygonal line are arranged in order. The vertices of the polyline are called nodes,
A straight line connecting two or more adjacent nodes is called a link. In the map information, the data of the background layer and the character / symbol layer are used for drawing the map image, and the road data of the road layer is used for map matching and the like. In the road layer, road data is the type of road (national road, highway,
Others) consists of the longitude / latitude coordinates of each node constituting the road, a flag indicating whether each node is an intersection, a flag indicating whether each node is a point at which a radio beacon or an optical beacon is emitted, etc. .

However, it is not possible to know the traffic jam location, the temporary traffic regulation location, the travel time between points, the vacancy of the parking lot, etc. only by the navigation function. Therefore, various types of road traffic information such as traffic jam information, traffic regulation information, travel time information between two points, parking information, etc. are provided to the vehicle from the outside using a communication medium, and the road traffic information is divided into screens. Separately from the map image, a few lines of characters may be displayed at the top of the screen (level 1), a simple graphic may be displayed on the entire screen (level 2), or a mark may be displayed over the map image on the screen. By doing so (level 3), practical application is being made so that the user can quickly and easily reach a desired place through an appropriate route while avoiding a traffic jam place and a traffic regulation place. For example, in a service called VICS, various types of road traffic information are provided by communication media such as FM multiplex broadcasting (providing wide area information), radio beacons or optical beacons (providing narrow area information). Beacon transmitters are installed on highways, optical beacon transmitters are installed at major intersections on general roads).

[0005]

By the way, the road traffic information by FM multiplex broadcasting can be obtained anywhere within the broadcasting service area, but it contains a wide range of road traffic information such as the entire Kanto area. It is difficult to obtain detailed information. On the other hand, according to the radio beacon and the optical beacon, detailed information can be obtained because the purpose is to provide the narrow area information of the radius number + km or less, but the information can be obtained only when the signal passes directly below the beacon transmitter. . Conventionally, switching display of road traffic information received by FM multiplex broadcasting and road traffic information received by a beacon transmitter has been performed based on a switching operation by a user (switching between FM, radio beacon, and optical beacon). For this reason, while traveling on the highway with the road traffic information received by FM multiplex broadcasting displayed on the screen, the vehicle passed directly under the radio beacon transmitter, so information such as detailed traffic congestion in front of the traveling direction and traffic restrictions was displayed. Even if it is received, if the user does not perform the operation of switching the communication medium to the radio wave beacon, detailed information ahead of the traveling direction cannot be obtained, and the exit on the front side of the expressway at the exit not in traffic jam It becomes impossible to take appropriate measures such as getting off.

The present invention has been made in view of the above problems of the prior art.
When receiving narrow area information while displaying wide area road traffic information on the screen, automatically switch to the narrow area information road traffic information and display it on the screen even if the user does not switch the communication medium. It is an object of the present invention to provide a vehicle-mounted navigation device that does. It is another object of the present invention to provide a vehicle-mounted navigation device that does not erroneously switch and display when normal narrow area information is not received. Also, provided is a vehicle-mounted navigation device that automatically switches to display of road traffic information based on wide area information when the vehicle travels to an area where the narrow area information is unnecessary after automatically switching to display of narrow area information. The purpose is to do.

[0007]

According to a first aspect of the present invention, there is provided a vehicle-mounted navigation device including first receiving means for receiving wide area road traffic information transmitted from the outside, and narrow area road traffic transmitted from the outside. Second receiving means for receiving information,
In-vehicle navigation comprising display means for displaying a road traffic information image on a screen and drawing means for drawing an image of the road traffic information on the screen using the road traffic information received by the first or second receiving means. In the apparatus, the second receiving means is provided with a detecting means for detecting that the road traffic information is received from the outside, and the drawing means usually draws an image of the road traffic information received from the first receiving means. Second by detection means
When the reception means detects that the road traffic information has been received, the image of the road traffic information received this time by the second reception means is drawn instead of the road traffic information received by the first reception means. It is characterized by being configured as described above.

According to a second aspect of the present invention, there is provided a vehicle-mounted navigation device in which the map information storage means for storing map information, the current position detection means for detecting the current position, and the detection means are the second ones. When it is detected that the road traffic information is received by the receiving means, an identifying means for identifying whether or not the vehicle is currently traveling to a place where the regular transmission signal can be received is provided from the current position and the map information. Even if the second receiving means detects that the road traffic information has been received, when the identifying means determines that the vehicle is not currently traveling in a place where the regular transmission signal can be received, the second receiving means this time. The feature is that the image of the received road traffic information is not drawn.

In the vehicle-mounted navigation device according to claim 3, when the second receiving means receives the road traffic information from the device according to claim 1 or 2 and an image of the received road traffic information is drawn. After that, a discriminating means for discriminating whether the vehicle has traveled a straight distance or a cumulative distance for a certain distance or a certain time from the point previously received by the second receiving means is provided, and the determining means first receives the second reception. When it is determined that the vehicle has traveled a fixed distance in a straight line distance or a cumulative distance from the point received by the means, or has traveled for a fixed time, the drawing means replaces the road traffic information received by the second receiving means with the first It is characterized in that the image of the road traffic information received by the receiving means is drawn.

In the vehicle-mounted navigation device according to the present invention, the map information storage means for storing the map information, the first receiving means for receiving the wide area road traffic information transmitted from the outside, and the external transmission information. Second receiving means for receiving road traffic information in a narrow area, display means for displaying a map image on the screen, position detecting means for detecting the current position of the vehicle, map information near the current position, and the first or first In the vehicle-mounted navigation device, the map image around the own vehicle position is drawn on the screen together with the road traffic information and the own vehicle position mark by using the road traffic information received by the second receiving means. The receiving means is provided with a detecting means for detecting that the road traffic information is received from the outside, and the drawing means is usually
The road traffic information received from the first receiving means is overlaid on the map image and drawn together with the vehicle position mark, and the second means is detected by the detecting means.
When the reception means detects that the road traffic information has been received, the road traffic information received by the second reception means this time is superimposed on the map image instead of the road traffic information received by the first reception means. It is characterized in that it is drawn together with the vehicle position mark.

According to a fifth aspect of the present invention, in the on-vehicle navigation system, the detecting means detects that the second receiving means has received the road traffic information.
Identification means for identifying whether or not the vehicle is currently traveling in a place where a legitimate transmission signal can be received from the current position and map information is provided, and the drawing means detects that the second reception means has received the road traffic information. However, when it is determined by the identification means that the vehicle is not currently traveling in a place where a regular transmission signal can be received, the road traffic information received by the second reception means is not drawn at this time. It has a feature.

In the vehicle-mounted navigation device according to the sixth aspect of the present invention, in addition to the device according to the fourth or fifth aspect, the second receiving means receives the road traffic information, and the received road traffic information is superimposed on the map image. When the drawing is performed together with the own vehicle position mark, thereafter, there is provided a judging means for judging whether the vehicle has traveled a fixed distance with a straight line distance or a cumulative distance from the point previously received by the second receiving means, or has traveled for a fixed time. When the means determines that the vehicle has traveled a fixed distance at a straight distance or a cumulative distance from the point previously received by the second receiving means, or has traveled for a predetermined time, the drawing means causes the drawing means to receive the road traffic received by the second receiving means. Instead of the information, the road traffic information received by the first receiving means is superimposed on the map image and drawn together with the vehicle position mark.

[0013]

According to the vehicle-mounted navigation device of the first aspect, the drawing means normally draws an image of wide area road traffic information received from the first receiving means, and the drawing means makes the second
When the reception means detects that the road traffic information has been received, instead of the road traffic information received by the first reception means, the image of the narrow area road traffic information received by the second reception means this time. To draw. Thereby, while displaying the road traffic information of the wide area on the screen, for example, when the road traffic information of the narrow area is received by the second receiving means while traveling on the highway, the road traffic information of the wide area is automatically detected. Since it switches to narrow area information, the user can obtain detailed information in front of the traveling direction without switching the communication medium, and take appropriate measures such as exiting the expressway at the exit before traffic congestion. it can.

According to the on-vehicle navigation device of the second aspect, in the device of the first aspect, when the detecting means detects that the second receiving means has received the road traffic information, the identifying means causes the present From location and map information,
Whether the vehicle is traveling in a place where a regular transmission signal can be received, and the drawing means detects the fact that the second receiving means has received the road traffic information.
When it is determined that the vehicle is not traveling in a place where the regular transmission signal can be received, the image of the road traffic information received by the second receiving unit is not drawn this time. As a result, for example, while driving on a general road running under an elevated highway, narrow-area road traffic information transmitted from the highway may be received incorrectly, Even if the narrow area road traffic information transmitted for the lane is erroneously received, it is possible to prevent erroneous switching to the narrow area road traffic information.

According to the vehicle-mounted navigation device of the third aspect, in the device of the first or second aspect,
When receiving the road traffic information by the receiving means and drawing an image of the received road traffic information, thereafter, traveling a straight distance or a fixed distance from the point previously received by the second receiving means, or Alternatively, when it is determined that the vehicle has traveled for a certain period of time by the determination means, and the determination means determines that the vehicle has traveled a certain distance with a straight line distance or a cumulative distance from the point previously received by the second receiving means, or has traveled for a certain time, The drawing means draws an image of the road traffic information received by the first receiving means, instead of the road traffic information received by the second receiving means. As a result, after automatically switching to the display of narrow area information, when traveling to an area where the narrow area information is unnecessary,
Again, it is possible to automatically switch to the display of road traffic information based on wide area information, which saves the user the trouble of switching to the original communication medium.

According to the vehicle-mounted navigation device of the fourth aspect, the drawing means normally draws the wide area road traffic information received from the first receiving means together with the own vehicle position mark on the map image, When the detection means detects that the second receiving means has received the road traffic information, the first means
Instead of the road traffic information received by the receiving means, the narrow area road traffic information received by the second receiving means is drawn together with the vehicle position mark on the map image. As a result, when the wide area road traffic information superimposed on the map image is displayed on the screen, for example, when the narrow area road traffic information is received by the second receiving means while traveling on the highway, it is overlaid on the map image. Since the road traffic information displayed as is switched from wide area information to narrow area information, detailed information ahead of the traveling direction can be obtained without the user having to switch communication media, and the highway at the exit before traffic congestion You can take appropriate action such as getting off.

According to a fifth aspect of the present invention, there is provided a vehicle-mounted navigation device according to the fourth aspect, wherein when the detecting means detects that the second receiving means has received the road traffic information, the identifying means causes the present From location and map information,
Whether the vehicle is traveling in a place where a regular transmission signal can be received, and the drawing means detects the fact that the second receiving means has received the road traffic information.
When it is determined that the vehicle is not traveling in a place where a regular transmission signal can be received, the road traffic information received by the second receiving unit is not drawn this time. As a result, for example, while driving on a general road running under an elevated highway, narrow-area road traffic information transmitted from the highway may be erroneously received, or the road lane may be opposite to the driving lane on the highway or general road. Even if the narrow area road traffic information transmitted for the lane is erroneously received, it is possible to prevent erroneous switching to the narrow area road traffic information.

According to the vehicle-mounted navigation device of the sixth aspect, in the device of the fourth or fifth aspect,
Receiving the road traffic information and drawing the received road traffic information together with the vehicle position mark on the map image, and thereafter, the linear distance from the point previously received by the second receiving means or the cumulative value. The discriminating means discriminates whether the vehicle has traveled a fixed distance or a fixed time, and the discriminating means travels a fixed distance by a straight line distance or a cumulative distance from the point previously received by the second receiving means, or a constant distance. When it is determined that the vehicle has traveled for a time, the drawing means draws the road traffic information received by the first receiving means together with the vehicle position mark on the map image instead of the road traffic information received by the second receiving means. To do. Thus, after automatically switching to the display of the narrow area information, when traveling to an area where the narrow area information is unnecessary, it is possible to automatically switch again to the display of the road traffic information based on the wide area information, and the user can return to the original display. The trouble of switching to a communication medium can be saved.

[0019]

1 is a block diagram of a vehicle-mounted navigation device according to an embodiment of the present invention. 1 is scale level 1
8 CDs that store map information for each scale and area
ROM, 2 is a CD-ROM drive device for reading the map information stored in CD-ROM 1, 3 is a GPS receiver for positioning the current position and current direction of the vehicle by satellite navigation, and 4 is V
An FM multiplex broadcasting receiver 5 serving as a first receiving means for receiving wide area road traffic information transmitted from the ICS center by FM multiplex broadcasting is denoted by a radio wave beacon transmitter 5 (mainly shown in FIG. 5). 17) as a second receiving means for receiving the narrow area road traffic information transmitted by a radio beacon from the radio beacon, 6 is an optical beacon transmitter installed mainly at a main intersection of a general road (Fig. (Not shown) is an optical beacon receiver as second receiving means for receiving road traffic information of a narrow area transmitted by an optical beacon. The FM multiplex broadcast receiver 4, the radio wave beacon receiver 5, and the optical beacon receiver 6 each have a memory (not shown) for temporarily storing the received road traffic information,
The road traffic information received is output according to a request from the vehicle-mounted navigation device body described later. Radio beacon receiver 5
Has a built-in road traffic information reception detection circuit (not shown) that detects the road traffic information when the vehicle travels directly under the radio beacon transmitter and receives the road traffic information by the radio beacon. There is. Similarly, the optical beacon receiver 6
Has a built-in road traffic information reception detection circuit (not shown) that detects when this vehicle travels directly below the optical beacon transmitter and receives road traffic information by the optical beacon and outputs a detection signal. There is.

The road traffic information transmitted from the VICS center includes traffic congestion information, traffic regulation information, travel time information between two points, and parking lot information.
~ It is possible to display in three forms of level 3. Level 1 is a form in which it is displayed in a few lines on the top of the screen separately from the map image, Level 2 is a form in which it is displayed in a simple graphic on almost the entire screen, and Level 3 is a congestion on the map image on the screen. This is a form in which marks are displayed in an overlapping manner.

Reference numeral 7 denotes a key operation device for the user to perform various key operations. The key operation device includes a key for changing a desired display mode (levels 1 to 3) of road traffic information and a road traffic information It is provided with keys for selecting desired information contents (levels 1 and 2). Reference numeral 8 denotes a display device. When the level 1 display mode is selected, road traffic information in a few lines of characters is displayed at the top of the screen, the map image is displayed in the remaining area, and the level 2 display mode is selected. If a simple graphic road traffic information is displayed on almost the entire screen and level 3 display mode is selected, road traffic information (congestion mark, traffic control mark, parking (A parking lot mark, etc.) and a vehicle position mark are displayed.

Reference numeral 9 is a vehicle-mounted navigation device body composed of a microcomputer, of which 10 is a CP.
U and 11 are ROMs that store various programs for causing the CPU to process navigation functions and display processing of road traffic information, and 12 is temporary storage of map information read from the CD-ROM 1 and FM multiplexing. A RAM having a buffer area for temporarily storing road traffic information received by the broadcast receiver 4, the radio wave beacon receiver 5, and the optical beacon receiver 6, a work area used by the CPU 10 for temporarily saving data, and the like, 13 ~ 15 is 1
First to third video RAMs having storage areas for screens, a map image is drawn in the first video RAM 13, an image of road traffic information is drawn in the second video RAM 14, and a third video RAM 15 is drawn. The vehicle position mark is drawn.

Reference numeral 16 denotes a synthesizing circuit, which is controlled by the CPU 10 so that when the display mode of the road traffic information is level 1,
The third video RAM1 is placed on the map image of the video RAM13.
The image of the vehicle position mark 5 and the image of the road traffic information (characters of several lines) of the second video RAM 14 are superposed in this order,
It is converted to the RGB signal format and is output to the display device 8 together with the synchronizing signal. In the case of the level 2 display mode, only the image (simplified figure) of the road traffic information in the second video RAM 14 is converted into the RGB signal format and is output to the display device 8 together with the synchronization signal. When the display form is level 3, the image of road traffic information (congestion mark, traffic control mark, parking lot mark, etc.) of the second video RAM 14 and the self of the third video RAM 15 are displayed on the map image of the first video RAM 13. The images of the vehicle position marks are superposed in order, converted into the RGB signal format, and output together with the synchronization signal to the display device 8.

Next, the operation of the above embodiment will be described with reference to FIGS. 2 and 3 are flowcharts showing the road traffic information display processing by the CPU 10, FIG. 4 is an operation explanatory diagram of the synthesizing circuit 16 in the level 3 display mode, and FIG. 5 is a case where the vehicle is traveling in a place where a regular beacon can be received. FIG. 6 is an explanatory diagram of the identification method, and FIG. 6 is an explanatory diagram of the display screen in the level 3 display mode. Initially, it is assumed that the vehicle is traveling on a highway.

Displaying Road Traffic Information Obtained from FM Multiplex Broadcast The CPU 10 automatically enters the navigation mode immediately after the power is turned on, and the level n of the road traffic information display mode is set.
Is set to 3 (step S1 in FIG. 2). As will be described later, the level n of this display form can be switched to any level among 1 to 3 by the user operating the key operation device 7 (steps S26 and S27 in FIG. 3), and level 1 , 2 is selected, it is possible to further select information contents such as traffic jam, parking lot, etc. by key operation of the key operation device 7 (steps S28 to S in FIG. 3).
30).

After the power is turned on, the GPS receiver 3 periodically measures the position and direction of the vehicle by satellite navigation and outputs positioning data. The FM multiplex broadcast receiver 4 stores road traffic information received by FM multiplex broadcast in a built-in memory (not shown), and the radio wave beacon receiver 5 is mainly a radio wave beacon transmitter (see FIG. 5) installed on a highway. When the vehicle travels immediately below the reference numeral 17), the road traffic information transmitted by the radio wave beacon is stored in a built-in memory (not shown), and the built-in road traffic information reception detection circuit (not shown) is stored. ) Outputs a road traffic information reception detection signal. Similarly, the optical beacon receiver 6 mainly stores road traffic information transmitted by the optical beacon when it travels immediately below an optical beacon transmitter (not shown) installed at a main intersection of a general road. A road traffic information reception detection circuit (not shown), which is stored in (not shown), outputs a road traffic information reception detection signal.

After setting n = 3 in step S1, the CPU 10 inputs the vehicle position data and vehicle direction data from the GPS receiver 3 (step S2) and controls the CD-ROM drive device 2 to control the CD-ROM 1 From the map information of the map area including the vehicle position at a predetermined scale level for navigation (here, scale level 7), and RA
Store in the buffer area of M12. Then, using the road layer data of the read map information, map matching such as a pattern matching method and a projection method is performed to correct the vehicle position on the road (step S3), and the corrected vehicle position is corrected. The type of road on which the vehicle is riding and the road links (nodes at both ends of the link) are specified and stored in the RAM 12 (step S4).

Next, the CPU 10 checks whether the corrected vehicle position is outside the area of the map image drawn in the first video RAM 13 (step S5). At first, nothing is drawn in the first video RAM 13, but in this case, it is determined to be YES in step S5, and step S5 is performed.
Proceed to step 6, and use the background layer and the character / symbol layer of the map information read out from the CD-ROM 1 earlier to display the map image of the area for one screen at scale level 7 including the corrected vehicle position in the north. On the first video RAM 13 (see FIG. 4). Subsequently, it is checked whether or not any image relating to road traffic information has been drawn in the second video RAM 14 (step S7). Since it is initially NO, the process proceeds to step S9, and the corrected vehicle position data and the GPS receiver 3 first From the input vehicle direction data, the third video RAM15
Video RAM in the case where the storage area of is corresponding to the map area of the map image of the first video RAM 13
A vehicle position mark with the vehicle direction oriented at a position corresponding to the vehicle position of 15 is drawn (see FIG. 4).

Next, it is checked whether or not the road traffic information is received by the radio beacon or the optical beacon based on the presence / absence of the road traffic information reception detection signal from the radio beacon receiver 5 or the optical beacon receiver 6 (step S10, S1
1). If there is none, it proceeds to FIG. 3 and checks whether the road traffic information currently obtained from the radio beacon or the optical beacon is being displayed (step S20). Since it is also NO here, the FM multiplex broadcast receiver 4 is requested to output the road traffic information and temporarily stored in the RAM 12. Then, using the road traffic information, an image showing a display mode level desired by the user and information content desired by the user is displayed on the second video RAM 14.
Is drawn (step S21). Specifically, level 1
In this case, the information content desired by the user is drawn in characters in the area of several lines at the upper end of the second video RAM 14. Level 2
In the case of, the information content desired by the user is drawn by a simple graphic in almost the entire area of the second video RAM 14. In the case of level 3, the storage area of the second video RAM 14 is the first video RAM 13
When it is assumed that it corresponds to the map area of the map image of No. 2, the traffic jam mark, the traffic regulation mark, the parking lot mark, etc. are respectively given to the traffic jam location, the traffic regulation location, the parking lot, etc. of the second video RAM 14. Draw in color. For example, the congestion mark is drawn in red during congestion and orange during congestion. The length of the traffic jam mark indicates the length of a traffic jam location or a congestion location. FIG. 4 shows an example in which a lane regulation mark is drawn.

Next, the level of the current display form is checked (step S22), and in the case of level 1, the CPU 10 sets the composition mode of the composition circuit 16 to level 1 to display the map image drawn in the first video RAM 13. First, the own vehicle position mark drawn in the third video RAM 15 is overlaid, and the road traffic information image (several lines) drawn on the upper end of the second video RAM 14 is overlaid thereon. The images of the three first to third video RAMs 13 to 15 are combined and output to the display device 8 together with the synchronization signal in the form of R, G, B signals for screen display (step S23). Further, in the case of level 2, the CPU 10 sets the combining mode of the combining circuit 16 to level 2 and sets the second video RA.
Only the image of the simple figure drawn on M14 is output to the display device 8 in the form of R, G, B signals together with the synchronization signal and displayed on the screen (step S24). Further, in the case of level 3, the CPU 10 sets the composition mode of the composition circuit 16 to level 3
First, the map indicating the road traffic information drawn on the second video RAM 14 is overlaid on the map image drawn on the first video RAM 13, and the vehicle is drawn on the third video RAM 15 on the mark. The position marks are overlapped so that the three first to third video RAMs 13 to 1
The images of No. 5 are combined and output to the display device 8 in the form of R, G, B signals together with the synchronization signal for screen display (step S25).

As a result, for example, when the display mode is level 3 and an image is drawn in the first to third video RAMs 13 to 15 as shown in FIG. 4, the display screen is as shown in FIG. It turns out that the GR has lane restrictions. After that, the CPU 10 checks whether or not the user has operated the key operation of the key operation device 7 to switch to an arbitrary level among 1 to 3 (step S26), and if YES, changes n according to the operation ( In step 27), it is also checked whether or not a desired information content in the road traffic information has been selected (step S28). If YES, if n is 1 or 2, the selected information content is registered in the RAM 12. (Steps S29 and S30). Then, returning to step S2 in FIG. 2, the same processing as described above is performed. The position of the vehicle after correction by map matching is the first video RAM.
If the user goes out of the map area of the map image drawn in 13, the CPU 10 determines YES in step S5, and the CD
-Using the map information around the vehicle position read from the ROM 1, the map image of the map area for one screen including the vehicle position and at the scale level 7 is redrawn in the first video RAM 13 (step S6). Since the road traffic information image has already been drawn in the second video RAM 14, the road traffic information image is drawn again in accordance with the rewriting of the map image in step S6 (step S8. In the process of step S8, actually). Is the first if level 3 is selected
Various marks indicating road traffic information may be redrawn according to the map area drawn on the video RAM 13).

By the way, in the FM multiplex broadcasting, since road traffic information in a wide area is transmitted, it is difficult to obtain detailed information about the currently running highway. However, even if the user performs the operation of switching the communication medium to the radio wave beacon, if the user has not passed under the radio wave beacon transmitter (see reference numeral 17 in FIG. 5) immediately before, detailed information about the front in the traveling direction is provided. Cannot be obtained, resulting in useless operation. In addition, it is not preferable in terms of safety to request the user to perform a switching operation while traveling. Therefore, in this embodiment,
When the road traffic information can be received by the electric wave beacon or the optical beacon while running, the wide area information received by FM multiplex broadcasting is automatically switched to the road traffic information by the narrow area information received by the beacon and displayed on the screen. ing.

Switching to road traffic information obtained from radio beacons
Replacement display, that is, while traveling in a certain direction on the highway HW as indicated by reference sign A in FIG. 5, when the vehicle passes directly below the radio wave beacon transmitter 17 installed for the lane in the traveling direction, the vehicle is beaconed. While moving within a range (see B of FIG. 5) in which the radio wave can be received, the radio wave beacon receiver 5 receives the road traffic information transmitted by the radio wave beacon and temporarily stores the road traffic information in a built-in memory (not shown). At this time, the road traffic information reception detection circuit built in the radio wave beacon receiver 5 outputs a road traffic information reception detection signal to the vehicle-mounted navigation device body 9. C
In step S10 of FIG. 2, the PU 10 periodically checks whether or not the reception of road traffic information is detected by the radio wave beacon receiver 5, and when the road traffic information reception detection signal is input, the determination is YES in step S10. .

At this time, the CPU 10 does not immediately draw the image of the received road traffic information, but first, at present,
The process of identifying whether the vehicle is traveling in a place where a legitimate beacon can be received is performed. This is because the highway HW is elevated as shown in FIG. 5, and the highway HW is located near the radio beacon transmitter 17.
When there is a general road GR running under W, there is a range C in which the beacon can be received even on the general road GR. Therefore, the road traffic information may be erroneously received from the beacon of the radio wave beacon transmitter 17 while the vehicle is traveling on the general road GR. In addition, even while traveling on the highway HW, the radio wave beacon transmitter 1
Range B in which the vehicle can receive beacons even when traveling in the lane opposite to the lane in which No. 7 is installed as indicated by arrow D
Is spread in the opposite lane, and road traffic information may be erroneously received from the beacon of the radio wave beacon transmitter 17. Even if the road traffic information obtained by the wrong beacon is displayed, it is not particularly useful for the driver, and the wide area information received by the original FM multiplex is convenient because the road traffic information ahead of the traveling direction can be seen.

First, the CPU 10 checks whether or not the type of road currently running, which is obtained in the process of step S4, indicates a highway (step S12). If it is NO, even though you are driving on the open road,
Assuming that the beacon is received from the radio beacon transmitter installed on the highway, the process of switching to the road traffic information received by the beacon is not performed. When the type of the road currently running matches the highway, the CPU determines YES in step 12. At this time, subsequently, with respect to the nodes at both ends of the road link obtained in step S4, it is checked whether the beacon post flag is set in the road layer to determine whether the vehicle is located near the post of the radio beacon, that is, Then, it is checked whether there is a place where a legitimate radio wave beacon can be received (step S13). If the vehicle is traveling in the direction of arrow D in FIG. 5, the determination is NO, and it is determined that the beacon for the opposite lane is received, and the switching processing to the road traffic information received by the beacon is not performed. Here, assuming that the vehicle is traveling in the direction of arrow A and the determination in step S13 is YES, the CPU 10 requests the radio wave beacon receiver 5 to output road traffic information and temporarily stores it in the RAM 12. . Then, using the road traffic information, an image showing the display mode level desired by the user and the information content desired by the user is drawn in the second video RAM 14 (step S14).

The image of the road traffic information drawn in the second video RAM 14 is combined with the images drawn in the first video RAM 13 and the second video RAM 15 in an appropriate combination according to the level of the display form and displayed on the screen. (Fig. 3
Any one of steps S22 and S23 to S25).
If the road traffic information received by the beacon contains traffic jam information on the expressway that was not included in the FM multiplex broadcast, for example, at level 3, as shown in FIG. 6 (2). The traffic jam mark E appears on the map image on the display screen. Therefore, the driver knows that there is a traffic jam ahead of the highway in which he / she is driving, and can drive with caution, and if there is an exit before the traffic jam, he can get down and drive on the open road Can be reached quickly.

When the vehicle is traveling while displaying the road traffic information obtained by the radio wave beacon, the CPU 10 determines YES in step S20 of FIG. 3, and the straight distance from the position of the beacon post receiving the displayed road traffic information. Calculate the distance to the current vehicle position as seen in (step S3
1). Then, a predetermined fixed distance (for example, 5 km, 10
(step S32), and if not yet, the display of the road traffic information received by the radio beacon is still useful for the driver, so the display of the road traffic information received by the radio beacon is displayed. (NO at step S32).

To road traffic information received from FM multiplex broadcasting
Switching Thereafter, when the distance from the position of the beacon post which receives the road traffic information being displayed to the current vehicle position as viewed in linear distance has reached a predetermined constant distance, road traffic CPU10 has received a radio wave beacon It is determined that the information display is no longer useful to the driver, and that the wide area information received by the FM multiplex broadcast is more effective for knowing the road traffic information ahead of the traveling direction (YES in step S32). In this case, CPU1
0 requests the FM multiplex broadcast receiver 4 to output road traffic information, and temporarily stores it in the RAM 12. Then, using the road traffic information, an image showing a display mode level desired by the user and information content desired by the user is displayed on the second video RAM 14.
Is drawn (step S21).

The image of the road traffic information drawn in the second video RAM 14 is combined with the images drawn in the first video RAM 13 and the second video RAM 15 in an appropriate combination according to the level of the display form and displayed on the screen. (Fig. 3
Any one of steps S22 and S23 to S25).
As a result, it is possible to know the road traffic information ahead of the traveling direction based on the wide area information received by the FM multiplex broadcasting.

[0040] To the road traffic information received from the optical beacon
It should be noted that when the vehicle travels directly below an optical beacon receiver (not shown) after getting off the road, the optical beacon receiver 6 receives the road traffic information and stores it in the internal memory, and An information reception detection signal is output. Then
The CPU 10 determines YES in step S11 of FIG. Then, first, it is checked whether or not the type of the road currently running, which is obtained in the processing of step S4, indicates a general road (other road) (step S15). If the answer is NO, it is assumed that the beacon from the optical beacon transmitter installed on the general road is mistakenly received while the vehicle is traveling on the highway, and the switching processing to the road traffic information received by the beacon is not performed. do not do. When the type of the road currently running matches the general road, the CPU proceeds to step 15
Is determined as YES. At this time, subsequently, step S4
By checking whether the beacon post flag is set in the road layer for the nodes at both ends of the road link obtained in step 1, whether the vehicle is located near the post of the optical beacon, that is, the regular optical beacon is received. It is checked whether there is a place to obtain (step S16). When it is NO, assuming that an optical beacon for the opposite lane is received,
The switching process to the road traffic information received by the beacon is not performed. Here, if the determination in step S16 is YES, the CPU 10 requests the optical beacon receiver 6 to output road traffic information and temporarily stores it in the RAM 12. Then, using the road traffic information, an image showing the display form level desired by the user and the information content desired by the user is drawn in the second video RAM 14 (step S1).
7).

The image of the road traffic information drawn in the second video RAM 14 is combined with the images drawn in the first video RAM 13 and the second video RAM 15 in an appropriate combination according to the level of the display form and displayed on the screen. (Fig. 3
Any one of steps S22 and S23 to S25).
Therefore, detailed road traffic information can be viewed ahead of the traveling direction. After the road traffic information obtained from the optical beacon is displayed, when the vehicle travels a certain distance or more from the optical beacon post, the CPU 10 switches to the display of the road traffic information obtained from the FM multiplex broadcasting (steps S20 and S31 in FIG. 3). , S32, S21, S22, S23 to S
Any one of 25).

In the above embodiment, when the optical beacon is received, it is checked in step S15 of FIG. 2 whether the vehicle is currently traveling on the general road. Since it rarely occurs, the check in step S15 may be omitted. Further, when the receivable area is limited so that the radio beacon or the optical beacon is not received in the lane opposite to the traveling lane, the checks in step S13 and step S16 can be omitted. Further, while displaying the road traffic information received by the beacon, step S3 in FIG.
By the processing of 1 and S32, it is determined whether or not the distance from the beacon post is a certain distance or more in a straight line, and when YES, it is automatically switched to the road traffic information received by FM multiplex. It is determined whether the distance is a certain distance or more, and if YES, it is automatically switched to the road traffic information received by FM multiplexing, or it is determined whether the vehicle has traveled for a certain time or more from the beacon post passage time.
At the time of ES, the road traffic information received by FM multiplexing may be automatically switched.

Further, although the three display modes of the road traffic information can be switched among levels 1, 2, and 3, only one display mode can be fixed, or only two display modes can be switched. You may do it. Also,
The display form of the road traffic information may be automatically switched between levels 1, 2, and 3 (for example, immediately after reception of a beacon, it is automatically set to level 2 or level 3).

[0044]

According to the vehicle-mounted navigation device of the first aspect, the drawing means usually draws an image of the road traffic information of a wide area received from the first receiving means, and the detecting means makes the second one. When it is detected by the receiving means that the road traffic information has been received, an image of the narrow area road traffic information received by the second receiving means this time is displayed instead of the road traffic information received by the first receiving means. draw. Thereby, while displaying the road traffic information of the wide area on the screen, for example, when the road traffic information of the narrow area is received by the second receiving means while traveling on the highway, the road traffic information of the wide area is automatically detected. Since it switches to narrow area information, the user can obtain detailed information in front of the traveling direction without switching the communication medium, and take appropriate measures such as exiting the expressway at the exit before traffic congestion. it can.

According to the on-vehicle navigation device of the second aspect, in the device of the first aspect, when the detecting means detects that the second receiving means has received the road traffic information, the identifying means causes the present From location and map information,
Whether the vehicle is traveling in a place where a regular transmission signal can be received, and the drawing means detects the fact that the second receiving means has received the road traffic information.
When it is determined that the vehicle is not traveling in a place where the regular transmission signal can be received, the image of the road traffic information received by the second receiving unit is not drawn this time. As a result, for example, while driving on a general road running under an elevated highway, narrow-area road traffic information transmitted from the highway may be received incorrectly, Even if the narrow area road traffic information transmitted for the lane is erroneously received, it is possible to prevent erroneous switching to the narrow area road traffic information.

According to the vehicle-mounted navigation device of the third aspect, in the device of the first or second aspect,
When receiving the road traffic information by the receiving means and drawing an image of the received road traffic information, thereafter, traveling a straight distance or a fixed distance from the point previously received by the second receiving means, or Alternatively, when it is determined that the vehicle has traveled for a certain period of time by the determination means, and the determination means determines that the vehicle has traveled a certain distance with a straight line distance or a cumulative distance from the point previously received by the second receiving means, or has traveled for a certain time, The drawing means draws an image of the road traffic information received by the first receiving means, instead of the road traffic information received by the second receiving means. As a result, after automatically switching to the display of narrow area information, when traveling to an area where the narrow area information is unnecessary,
Again, it is possible to automatically switch to the display of road traffic information based on wide area information, which saves the user the trouble of switching to the original communication medium.

According to the vehicle-mounted navigation device of the fourth aspect, the drawing means usually draws the wide area road traffic information received from the first receiving means together with the own vehicle position mark on the map image, When the detection means detects that the second receiving means has received the road traffic information, the first means
Instead of the road traffic information received by the receiving means, the narrow area road traffic information received by the second receiving means is drawn together with the vehicle position mark on the map image. As a result, when the wide area road traffic information superimposed on the map image is displayed on the screen, for example, when the narrow area road traffic information is received by the second receiving means while traveling on the highway, it is overlaid on the map image. Since the road traffic information displayed as is switched from wide area information to narrow area information, detailed information ahead of the traveling direction can be obtained without the user having to switch communication media, and the highway at the exit before traffic congestion You can take appropriate action such as getting off.

According to the on-vehicle navigation device of the fifth aspect, in the device of the fourth aspect, when the detecting means detects that the second receiving means has received the road traffic information, the identifying means causes the present From location and map information,
Whether the vehicle is traveling in a place where a regular transmission signal can be received, and the drawing means detects the fact that the second receiving means has received the road traffic information.
When it is determined that the vehicle is not traveling in a place where a regular transmission signal can be received, the road traffic information received by the second receiving unit is not drawn this time. As a result, for example, while driving on a general road running under an elevated highway, narrow-area road traffic information transmitted from the highway may be erroneously received, or the road lane may be opposite to the driving lane on the highway or general road. Even if the narrow area road traffic information transmitted for the lane is erroneously received, it is possible to prevent erroneous switching to the narrow area road traffic information.

According to the vehicle-mounted navigation device of the sixth aspect, in the device of the fourth or fifth aspect,
Receiving the road traffic information and drawing the received road traffic information together with the vehicle position mark on the map image, and thereafter, the linear distance from the point previously received by the second receiving means or the cumulative value. The discriminating means discriminates whether the vehicle has traveled a fixed distance or a fixed time, and the discriminating means travels a fixed distance by a straight line distance or a cumulative distance from the point previously received by the second receiving means, or a constant distance. When it is determined that the vehicle has traveled for a time, the drawing means draws the road traffic information received by the first receiving means together with the vehicle position mark on the map image instead of the road traffic information received by the second receiving means. To do. Thus, after automatically switching to the display of the narrow area information, when traveling to an area where the narrow area information is unnecessary, it is possible to automatically switch again to the display of the road traffic information based on the wide area information, and the user can return to the original display. The trouble of switching to a communication medium can be saved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a vehicle-mounted navigation device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing road traffic information display processing by a CPU.

FIG. 3 is a flowchart showing road traffic information display processing by a CPU.

FIG. 4 is an operation explanatory diagram of a synthesizing circuit in a level 3 display mode.

FIG. 5 is an explanatory diagram of a method of identifying whether the vehicle is traveling in a place where a regular beacon can be received.

FIG. 6 is an explanatory diagram of a display screen in a level 3 display mode.

[Explanation of symbols]

1 CD-ROM 2 CD-ROM
Drive device 3 GPS receiver 4 FM multiplex broadcast receiver 5 Radio wave beacon receiver 6 Optical beacon receiver 7 Key operation device 8 Display device 9 In-vehicle navigation device body 10 CPU 11 ROM 12 RAM 13 First video RAM 14 Second video RAM 15 Third video RAM 16 Compositing circuit 17 Radio wave beacon transmitter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsumi Tomizawa 1-14-6 Dogenzaka, Shibuya-ku, Tokyo Kenwood Co., Ltd.

Claims (6)

[Claims] 1. A first receiving means for receiving wide area road traffic information transmitted from the outside, a second receiving means for receiving narrow area road traffic information transmitted from the outside, and road traffic on the screen. Display means for displaying the information image, and the first or second
In a vehicle-mounted navigation device comprising: a drawing means for drawing an image of the road traffic information on a screen using the road traffic information received by the receiving means, the second receiving means receives the road traffic information from the outside. The drawing means normally draws an image of the road traffic information received from the first receiving means, and the detecting means detects that the road traffic information is received by the second receiving means. Instead of the road traffic information received by the first receiving means,
A vehicle-mounted navigation device, characterized in that it is configured to draw an image of road traffic information received by the second receiving means. 2. The current position when the map information storage means for storing map information, the current position detection means for detecting the current position, and the detection means have received the road traffic information by the second receiving means. Identification means for identifying whether or not the vehicle is currently traveling in a place where a legitimate transmission signal can be received is provided from the map information and the drawing means even if the detection means detects that the second reception means has received the road traffic information. , When the identifying means determines that the vehicle is not currently traveling in a place where a regular transmission signal can be received, the image of the road traffic information received by the second receiving means is not drawn at this time. The vehicle-mounted navigation device according to claim 1. 3. When the second receiving means receives the road traffic information and draws an image of the received road traffic information, a straight line distance or a cumulative distance from the point previously received by the second receiving means. Is provided with a discriminating means for discriminating whether the vehicle has traveled for a certain distance or for a certain period of time. When it is determined that the vehicle has traveled for a time, the drawing means draws an image of the road traffic information received by the first receiving means instead of the road traffic information received by the second receiving means. The in-vehicle navigation device according to claim 1 or 2. 4. A map information storage means for storing map information, a first receiving means for receiving wide area road traffic information transmitted from the outside, and a narrow area road traffic information transmitted from the outside. Second receiving means, display means for displaying a map image on the screen, position detecting means for detecting the current position of the vehicle, map information near the current position, and road traffic received by the first or second receiving means. In a vehicle-mounted navigation device equipped with a drawing means for drawing a map image of the vicinity of the own vehicle position on the screen together with the road traffic information and the own vehicle position mark using the information, the second receiving means receives the road traffic information from the outside. Detecting means for detecting the reception is provided, and the drawing means normally draws the road traffic information received from the first receiving means on the map image together with the own vehicle position mark, and the detecting means receives the second signal. hand When it is detected that the road traffic information has been received by the vehicle, instead of the road traffic information received by the first receiving means, the road traffic information received by the second receiving means this time is overlaid on the map image An in-vehicle navigation device characterized by being configured so as to be drawn together with a position mark. 5. An identification means for identifying whether or not the vehicle is currently traveling at a place where a proper transmission signal can be received, based on the current position and map information, when the detection means detects that the second receiving means has received the road traffic information. Even if the detecting means detects that the second receiving means has received the road traffic information, the identifying means determines that the drawing means is not currently traveling in a place where a regular transmission signal can be received. The vehicle-mounted navigation device according to claim 4, wherein the road traffic information received by the second receiving unit is not drawn at this time. 6. When the second receiving means receives the road traffic information and draws the received road traffic information on the map image together with the vehicle position mark, the second receiving means receives the road traffic information first. The determination means is provided to determine whether the vehicle has traveled a fixed distance or a fixed time or a fixed time from the specified point, and the determination means determines the linear distance or the cumulative distance from the point previously received by the second receiving means. When it is determined that the vehicle has traveled for a certain distance or for a certain time, the drawing means displays the road traffic information received by the first receiving means on the map image instead of the road traffic information received by the second receiving means. The vehicle-mounted navigation device according to claim 4 or 5, wherein the vehicle position mark and the vehicle position mark are overlapped and drawn.