JP2001141474A - Car navigation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the communication amount of data and to reduce the capacity of a memory in a car navigation apparatus which is equipped with an information communication function and which transmits and receives data on a route guide between a plurality of car navigation apparatuses. SOLUTION: A communication device C which transmits and receives data on a route guide with another car navigation apparatus B is provided. A car navigation apparatus A is equipped with a means which transmits and receives position information data as data on the route guide. The amount of data on the route guide can be reduced, the time required for a communication is reduced, and the capacity of a memory can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a car navigation device having a communication function.

[0002]

2. Description of the Related Art Generally, a car navigation system receives a navigation radio wave transmitted from a plurality of GPS satellites to the ground when a car is moving, and detects a current position by using a GPS (Global Positining System general-purpose system). The position of the vehicle is displayed using a global positioning system.

Recently, such a car navigation device has an information communication function and transmits and receives route guidance data between a plurality of car navigation devices.
Systems for guiding each of a plurality of vehicles equipped with a car navigation device to a destination have been developed.

FIG. 4 is a schematic diagram of a plurality of conventional car navigation devices having the information communication function and an explanatory diagram of information data.

As shown in the figure, a car navigation system A
And B each include a communication device C, transmit and receive route guidance data between the car navigation devices A and B via the communication device C, and aim at each automobile equipped with the car navigation devices A and B. Guide to the ground.

As shown in FIG. 4, route guidance data transmitted and received between the car navigation device A and the car navigation device B includes a current location, for example, a national highway.
, National highway XX, transit point,... Destination, and the car navigation device A
And a plurality of vehicles equipped with the car navigation device B are guided to the destination along the same route.

[0007]

However, the conventional car navigation system transmits the entire route information used for route guidance, and the amount of data is increased. Therefore, communication takes time, communication charges (call charges for mobile phones, etc.) increase, and the possibility of entering a place where radio waves do not reach, such as a tunnel, increases during communication, and communication may be interrupted on the way. In addition, there is a problem that the capacity of a memory for temporarily storing data must be increased. In addition, there is a problem that it is not possible to transmit only drive information (position information of each facility, position information of a uniquely registered mark, etc.) which is not related to the route setting.

An object of the present invention is to provide a car navigation apparatus which can reduce the amount of data transmitted and received between a plurality of car navigation apparatuses and provide accurate guidance, while keeping in mind the above conventional problems.

[0009]

To achieve the above object, the present invention comprises a communication device for transmitting and receiving route guidance data to and from another car navigation device, and transmits and receives only positional information data via the communication device. It is a car navigation device having means.

According to the present invention, the amount of data transmitted and received between a plurality of car navigation devices is reduced, the communication does not take much time, the communication fee is reduced, and the capacity of a memory for temporarily storing data is reduced. Can also be small.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention is a car navigation system which receives a navigation radio wave transmitted from a plurality of GPS satellites, measures a current position, and displays a position of a vehicle. A car navigation device comprising: a communication device that transmits and receives route guidance data to and from another car navigation device; and a unit that transmits and receives only position information data as the route guidance data. It has the effect of reducing the amount of data transmitted and received between them, reducing the time required for communication, reducing the communication fee, and reducing the capacity of the memory for temporarily storing data.

According to a second aspect of the present invention, in the car navigation apparatus according to the first aspect, the position information is set as point information of a departure point, a transit point, and a destination. In addition to reducing communication time, it is possible to reduce the time required for communication and to provide an accurate guide to the car navigation device on the receiving side.

According to a third aspect of the present invention, in the car navigation system according to the first aspect, the position information is the position of a facility or the like or the position information of a registered mark. In addition to reducing the amount of data to be transmitted, the communication does not take much time, and has an effect of being able to provide accurate guidance to the car navigation device on the receiving side.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is an explanatory diagram of a schematic configuration and information data of a car navigation device according to an embodiment 1 of the present invention, FIG. 2 is an operation explanatory diagram of the car navigation device, and FIG. It is a block circuit diagram of the car navigation device. In the drawings, the same components as those in the conventional technology are denoted by the same reference numerals as those in the conventional technology.

As shown in FIG. 1, Embodiment 1 of the present invention
The car navigation devices A and B each include a communication device C, perform transmission and reception of only position information data between the car navigation devices A and B via the communication device C, and are equipped with the car navigation devices A and B. Guide each car to its destination.

The position information data transmitted and received between the car navigation device A and the car navigation device B is drive information. For example, when the route information is transmitted, as shown in FIG. At the current location, stopover 1 (rest area), stopover 2
(Merging point)... Each position data such as the waypoint n and the destination is set, and the drive information is transmitted. The route search is performed by the car navigation device B on the receiving side that has received the drive information, so that a plurality of vehicles equipped with the car navigation devices A and B are guided to the destination through the same route. It is.

More specifically, the car navigation system A on the transmitting side performs the following operations after enabling communication with the car navigation system B on the receiving side. That is, as shown in FIG. 2, the drive information transmission is selected from E-mail, Internet, and drive information transmission in the communication menu. As the drive information transmission, route data is selected from among facility, nearest, route, and address data. The route data is position data such as a stopover 1, a stopover 2, a stopover n, and a destination, and these are transmitted.

The car navigation system according to the first embodiment has a configuration shown in FIG. 3, that is, a CPU (central processing unit) 1 for controlling the operation of the car navigation system, and a user operating the CPU 1 with respect to the CPU 1. An input device 2 for inputting a command or the like, a display device 3 for displaying and outputting a processing result by the CPU 1, and a graphic controller 4 for performing a screen display process of the display device 3 based on input image information and the like
a display control device 4 having a video RAM 4b for temporarily storing image data to be displayed on the display device 3 inputted from the graphic controller 4a and controlling the display operation of the display device 3; A self-contained navigation unit 5b capable of detecting the speed and inclination of the vehicle and detecting the position of the vehicle even in a tunnel or the like which cannot receive navigation radio waves from GPS satellites, and a GPS receiver Combine input from 5a and CP
Interface 5 for converting to data that can be input / output to / from U1
An antenna 6 for receiving a navigation radio wave from a GPS satellite, a CD-ROM (read-only compact disk memory) 7 storing map information and the like, a CD-RO
CD-R for reading and outputting information recorded in M7
An OM drive 8, a ROM 9 storing a program for controlling the CPU 1 and graphic data to be displayed on the display device 3, a RAM 10 for storing data and the like generated temporarily when the CPU 1 operates, and a command from the CPU 1 An audio output control device 11 that controls audio output based on the
A speaker 12 that outputs sound according to an audio signal input from the audio output control device 11, a communication control device 13 controlled by the CPU 1, a communication device 14 such as a cellular telephone controlled by the communication control device 13, a CPU 1, Input device 2, display control device 4, interface 5, CD
A bus line 15 commonly connected to the ROM drive 8, the ROM 9, the RAM 10, the audio output control device 11, and the communication control device 13;

This car navigation system performs a normal operation, that is, when the vehicle is moving, receives navigation radio waves transmitted to the ground from a plurality of GPS satellites to determine the current position, and performs positioning of the own vehicle. Displays the location,
A description of this operation will be omitted.

The feature of the car navigation system according to the first embodiment is that the following operation is performed. That is, when setting a route, the starting point, the waypoint,
Enter the destination point. The point information input from the input device 2 is stored in the RAM 10, and the CPU 1
From the map information stored in the ROM 7, create route guidance from the departure point to the destination via the transit point;
The information is stored in the AM 10 and displayed on the display device 3.

Thereafter, when the transmission of the route information is instructed as shown in FIG. 2, the CPU 1 controls the communication control device 13 and uses the communication device 14 such as a cellular telephone to receive the car navigation device B on the receiving side. The communication device C of the transmission side is dialed, and the car navigation device A on the transmission side and the car navigation device B on the reception side are brought into a communication state.

Here, the car navigation device A on the transmitting side
CPU 1 reads out the point information of the departure point, the transit point, and the destination stored in the RAM 10 and transmits the point information from the communication device 14 via the communication control device 13.

The car navigation apparatus B on the receiving side stores the received point information in the RAM 10, and the CPU 1 uses the map information stored in the CD-ROM 7 based on the stored point information to route from the starting point. Route guidance to the destination through the ground is created and displayed on the display device 3.

The transmitting side car navigation system A transmits not only the route transit point and the destination information but also the position information of the searched facility or the mark registered on the transmitting side. Location information can be transmitted. In addition, the car navigation device B on the receiving side can express the position information as a landmark or use it for route setting.

As described above, in the first embodiment, since the position information is transmitted and received between a plurality of car navigation devices to guide the route to the destination, the data amount of the route guide can be reduced, and the communication can be performed. In no time,
Communication charges (call charges for mobile phones, etc.) can be reduced, the memory capacity for temporarily storing data can be reduced, and drive information (location information for each facility) that is not related to route settings Or the position information of a uniquely registered mark) can be transmitted.

[0027]

As is apparent from the above description, the car navigation device according to the present invention includes a communication device for transmitting and receiving route guidance data to and from another car navigation device, and only the position information data is transmitted via the communication device. , The amount of route guidance data can be reduced, communication does not take much time, and communication fees can be reduced. In addition, the capacity of the memory for temporarily storing data can be small, and further, only the drive information that is not related to the route setting can be transmitted, and the effect is large.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration and information data of a car navigation device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of the operation of the car navigation device.

FIG. 3 is a block circuit diagram of the car navigation device.

FIG. 4 is an explanatory diagram of a schematic configuration of a conventional car navigation device and information data.

[Explanation of symbols]

 Reference Signs List 1 CPU 2 input device 3 display device 4 display control device 4a graphic controller 4b video RAM 5 interface 5a GPS receiver 5b self-contained navigation unit 6 antenna 7 CD-ROM 8 CD-ROM drive 9 ROM 10 RAM 11 RAM 11 audio output control device 12 Speaker 13 Communication control device 14 Communication device 15 Bus line A Car navigation device B Car navigation device C Communication device

Claims (3)

[Claims] 1. A car navigation device for receiving navigation radio waves wirelessly transmitted from a plurality of GPS satellites to measure a current position and to display a position of a vehicle, and to provide route guidance to another car navigation device. A car navigation device comprising: a communication device for transmitting and receiving data; and means for transmitting and receiving only position information data as the route guidance data. 2. The car navigation system according to claim 1, wherein the position information is point information of a departure point, a transit point, and a destination. 3. The car navigation apparatus according to claim 1, wherein the position information is a position of a facility or the position information of a registered mark.