JPH0470999A - On-vehicle navigator - Google Patents

Abstract

PURPOSE:To recognize the running position of the other vehicle and to prevent the vehicle from going astray by overlapping and displaying the running position of the other vehicle on the display map of the self-vehicle. CONSTITUTION:To know the running position of the other vehicle, the command key of an operation part 7 is turned on, and the ID card of the objective vehicle is inputted. Then, an ID code data is transmitted from a microcomputer 2 to an ID decision circuit 13, and the state of a changeover circuit 11 is reversed, and a buffer 14 is connected to the microcomputer 2. After that, when a radio MODEM 12 receives a signal from the objective vehicle, this signal is converted to a digital data, and taken in through the ID decision circuit 13, buffer 14, and changeover circuit 11 to the microcomputer 2. The microcomputer 2 overlaps and displays the running position of the other vehicle based on this data on a CRT screen. Thus, the current position of the other vehicle can be recognized to turned to be very effective in the case of going astray.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to an on-vehicle navigation device.

(B) Conventional technology According to currently developed in-vehicle navigation devices, it is possible to display a map of a predetermined area on a display device such as a CRT installed inside the car, and furthermore, the map can be displayed on the map when the vehicle is traveling. Positions can be overlaid. In addition, data indicating traffic information such as congestion is received from a roadside communication device outside the vehicle.
By reproducing this data, such traffic information and the like can also be displayed on the display device. By using such a device, a driving vehicle can reach its destination without getting lost or getting caught in traffic jams.

(c) Problems to be Solved by the Invention However, with such a navigation device, when there are multiple cars heading to a destination, it is not possible to recognize the current location of the other cars. Being able to recognize the current location of another vehicle is extremely useful in situations such as when you become separated from another vehicle. Therefore, the present invention
To provide an in-vehicle navigation device that can also recognize the current location of other vehicles.

(d) Means for Solving the Problems In view of the above-mentioned problems, the present invention provides an in-vehicle navigation device that superimposes and displays the position of the own vehicle on a map obtained by reproducing a medium. The present invention is characterized by comprising means for transmitting the data, means for receiving the data transmitted by another vehicle, and means for superimposing the position of the other vehicle on the map based on the received data.

(E) Effect When the own vehicle receives the traveling position data transmitted from another vehicle, it superimposes the traveling position of the other vehicle on the map in accordance with this data.

(f) Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit block diagram of this embodiment. In the figure, (1) is a CD-ROM playback unit that plays back a CD-ROM disc storing map data in response to instructions from a microcomputer (2). (3) is a display unit, which has a CRT display and displays a map of a predetermined area, the driving position of the vehicle, etc. on the CRT display according to data from the microcomputer (2). (4) is RAM
(Random Access Memory) stores the data sent from the microcomputer (2). (5)
is a ROM (Read Only Memory) that stores programs necessary for controlling each part by the microcomputer (2).

(6) is a current position detection unit, which has a vehicle speed detector and a direction sensor, and estimates the traveling position of the vehicle and updates this sequentially.

Among these, the vehicle speed detector generates a vehicle speed pulse according to the number of rotations of the tires. The travel distance of the vehicle according to one vehicle speed pulse (△ is constant. Also, the direction sensor is
It is composed of geomagnetic sensors and other components, and detects the direction in which the vehicle is traveling. The traveling position of the vehicle is updated by adding the traveling distance (△) vectorwise according to the vehicle traveling direction every time a vehicle speed pulse is issued.
) is an operation unit that sends various commands to the microcomputer (2) when operated by the user.

When a command to display a map of a predetermined area is issued via the operation unit (7), map data corresponding to this command is stored on a CD-R.
It is reproduced by the OM reproduction section (1) and sent to the microcomputer (2). The microcomputer (2) stores this data in the RAM (4) and sends the data to the display section (3) to display a map of this area on the CRT display. Then the user:
By operating the operating section (7), the current position of the vehicle on this map is initialized. Thereafter, when the vehicle starts traveling, the current position detecting section (6) updates the vehicle's traveling position one after another, and the vehicle's traveling position displayed on the map moves accordingly.

(8) is a road communication device (beacon) placed at a predetermined interval on the road route, and transmits a signal having a format as shown in FIG. This signal is transmitted by a beacon (
8) can be broadly divided into a data group (A) indicating the installation location and a data group (B) indicating traffic information around this location (traffic jam information, accident information, construction information, etc.). Such a signal is received by the vehicle's receiver (9) when the vehicle passes in front of the installation location of the beacon (8). The data received in this way is normally stored in a buffer (10) and then sent to a microcomputer (2) via a switching circuit (11).
sent to.

The microcomputer (2) displays various types of traffic information on the CRT screen according to the traffic information data group (B) among such data. Further, the traveling position of the vehicle is corrected according to the position data group (A). In other words, as mentioned above, the vehicle's running position is estimated by the current position detection unit (6), but since the running position is determined by estimation, there is a difference between the vehicle's running position and the actual running position. An error occurs. Therefore, the traveling position of the vehicle is corrected using the position data group (A) from the beacon (8) to eliminate this error.

In this way, when the vehicle crosses in front of the beacon (8),
The driving position of the vehicle is corrected and traffic information is displayed.

As described above, a map, driving position, various traffic information, etc. are displayed on the CRT screen, but in this embodiment, a wireless modem (12), an ID discrimination circuit (13), a buffer (
14), it is also possible to display the driving position of other vehicles.

The microcomputer (2) creates digital data in the format shown in FIG. 3 as data indicating the traveling position of the vehicle and sends it to the wireless modem (12). Here, the ID code is a code for identifying the vehicle and is set by the user. For example, it is good to set the plate number of the vehicle. The wireless modem (12) converts the digital data into an analog signal and transmits it. The wireless modem (12) also has a function of receiving the analog signal transmitted by another vehicle.

A signal from another vehicle received by the wireless modem (12) is converted into a digital data signal in the format shown in FIG. 3, and then sent to the ID discrimination circuit (13). Further, a predetermined ID code signal is sent from the microcomputer (2) to the ID discrimination circuit (13). ID discrimination circuit (
13) compares this ID code with the ID code in the digital data sent from the wireless modem (12), and only when the two match, sends this digital data to the buffer (14). A buffer (14) stores such digital data. The switching circuit (13) normally connects the buffer (10) to the microcomputer (2) and also connects the buffer (10) to the microcomputer (2).
4) is cut off from the microcomputer (2), the data in the buffer (14) is not sent to the microcomputer (2).

If you want to know the driving position of another vehicle, turn on the command key on the operation unit (7) and input the ID code of the other vehicle. Then, this ID code data is sent from the microcomputer (2) to the ID discriminating circuit (13), and the state of the switching circuit (11) is inverted and the buffer (14) is connected to the microcomputer (2). After that, when the wireless modem (12) receives a signal from the target other vehicle,
After this signal is converted into digital data having the format shown in Fig. 3, it is sent to an ID discrimination circuit (13), a buffer (
14), is taken into the microcomputer (2) via the switching circuit (11). Based on this data, the microcomputer (2) superimposes and displays the traveling position of the other vehicle on the CRT screen.

In the above embodiment, the switching circuit (11) selectively sends data from the wireless modem (12) and data from the receiver (9) to the microcomputer (2). For this reason, when the device is set to a mode for recognizing the position of other objects, the microcomputer (2) cannot receive data from the receiver (9). However, even in such a mode, the receiver (9) may receive data from a new beacon (8). It is better to configure the system so that it can be incorporated into the system. To achieve such a configuration, in the above embodiment, the switching circuit (11) is omitted, the buffers (10) and (14) are connected to the microcomputer (2), and the microcomputer (2) is connected to both buffers (11). 10) (14)
All you have to do is to import data from , and perform the processing according to each data in parallel.

Further, in the above embodiment, the data indicating the vehicle traveling position emitted from the wireless modem (12) is transmitted to the current position detecting section (6).
) is created according to the vehicle running position created by. However, since the current position detecting section (6) estimates the traveling position by dead reckoning navigation, the traveling position of the vehicle according to the data includes an error corresponding to such estimation.

On the other hand, instead of creating the vehicle running position data in this way, in response to receiving the signal from the beacon (8),
When an ID code is attached to this signal to create vehicle traveling position data (see Figure 4), the position where the vehicle crosses in front of the beacon (8) is notified to other vehicles as the vehicle's traveling position.
It is possible to inform other vehicles of the extremely accurate driving position of the own vehicle. Furthermore, it is also possible to inform other vehicles of traffic information etc. around the driving position of the own vehicle. FIG. 5 shows an example of a display screen on which other vehicles are displayed according to this embodiment. However, this case has the disadvantage that the driving position of the own vehicle cannot be transmitted to other vehicles unless the vehicle passes in front of the beacon.

Although various embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to these embodiments and that various other modifications are possible.

(G) Effects of the Invention According to the present invention, the driving position of another vehicle can be displayed superimposed on the display map of the own vehicle. The driving position of the vehicle can be recognized, thereby preventing the vehicle from straying from other vehicles.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram showing one embodiment of the present invention;
The figure shows a 7-order format of transmission data in the same embodiment, FIG. 4 shows a 7-order format for transmission data in another embodiment, and FIG. 5 shows an example of a display screen according to another embodiment. FIG. 2 is a diagram showing the format of a signal emitted from a beacon. (3) Display unit (display means), (12) Radio modem (transmission means, reception means), (2) Microcomputer. Figure 2 Figure 4 Figure 6

Claims (3)

[Claims] (1) In an in-vehicle navigation device that superimposes and displays the position of the own vehicle on a map obtained by playing a medium, there is a means for transmitting data indicating the traveling position of the own vehicle, and a means for transmitting the data transmitted by another vehicle. An in-vehicle navigation device comprising: means for receiving data; and means for superimposing and displaying the position of another vehicle on the map based on the received data. (2) The in-vehicle navigation device according to claim (1), wherein the transmitting means includes means for selecting and transmitting at least data indicating the current position from among the data from the on-road communication device. (3) In addition to the current location data, the selection transmission means also transmits data indicating traffic information indicating the surrounding conditions of the current location, and the display means also displays the traffic information superimposed on the map. The in-vehicle navigation device according to claim (2).