JPH11187456A - Information exchange system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a system to serve information from a center to a mobile body, without troubling a driver of the mobile body, even when the provisions for the mobile body when it leaves path data or the traffic circumstance is subject to change. SOLUTION: A mobile body 2 informs a center 4 of information of a current position and of a destination. The center 4 searches a path by using its own database and sends path data obtained by through the path search to the mobile body 2 in this information exchange system 1. When the mobile body 2 leaves from the path data, the connection of the mobile body 2 to the center 4 is made automatically. When the mobile body 2 outputs a re-path retrieval request together with an identification ID ad current position data to the center 4, the center 4 searches or the path again and sends new path data to the mobile body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information exchange system, and more particularly, to an information exchange system having a database on a center side, searching for a route using the database, and transmitting route data to a mobile unit.

[0002]

2. Description of the Related Art Conventionally, an external service center or the like is accessed using communication such as a cellular phone to obtain route data to a desired destination, and route guidance is provided in a vehicle using this data. A navigation system is disclosed, for example, in Japanese Patent Application Laid-Open No. 2-206900. In such a system, since the route data depends on the database on the center side, there is no need to have a database on the vehicle side, the hardware is simplified, and the latest map database can be used. is there.

[0003]

However, there is a problem in that data transfer by communication has a limitation in data transfer capability, and communication is interrupted during data transfer. In addition, in order to respond to departure from the provided route and to update route information due to changes in traffic conditions, connect to the center again, set again, and obtain route data again. The need for things can be tedious and cumbersome for the driver.

[0004] Therefore, the present invention has been made in view of the above-mentioned problems, and it is possible to efficiently provide information even if the driver responds to departure or changes in traffic conditions without bothering the driver. Is a technical issue.

[0005]

Means for Solving the Problems The technical means taken to solve the above-mentioned problem is to perform position detection by a mobile body, and the mobile body sends its own location information and destination to a center using a line. An information exchange system that outputs a route request up to the center to the center, performs a search for the route request using the database of the center, and transmits the route data obtained by the search to a mobile unit. If the mobile is deemed to be a departure compared to the current position with respect to the route data transmitted from the center, a connection from the mobile to the center is automatically made, and the mobile is identified. A re-route request is output to the center together with the ID and the current position data, and the center performs a re-search based on the ID for identification, and sends new route data to the moving body. It was assumed to be.

[0006] With the above structure, when the mobile unit leaves the route data, the connection from the mobile unit to the center is automatically made, and the mobile unit sends a re-route request to the center together with the identification ID and the current position data. Then, the center performs a re-search based on the identification ID, and transmits new route data to the moving object. For this reason, since the automatic processing of the re-search is performed, the driver is not bothered.

In this case, the route data is divided into blocks,
If transmission is performed from a block closer to the current position of the moving object, path data can be divided and transmitted, and transmission can be performed efficiently from a block closer to the current position.

[0008] If the center adds the identification ID to the route data transmitted to the mobile unit and holds the route data for a certain period of time, the route data can be retransmitted based on the identification ID.

Further, in the center, when new traffic information is input from an external traffic information center, and there is a moving body affected by the traffic information in the stored route data, the center is sent to the corresponding moving body. Automatic connection is made from the side, route data based on traffic information is searched based on information on the current position from the mobile, and if it is sent to the mobile, it is based on information from the traffic information center Since the route data is provided to the moving body, the center can search for the route data corresponding to the ever-changing traffic condition, and the accurate route data can be provided to the moving body.

In addition, the mobile checks whether or not the route data received for a predetermined time is received in the received route data. If the data is not received for a predetermined time, the route to the center is determined. If data transmission is requested, partial transmission can be performed without transmitting all route data, so that efficient data transmission can be performed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a system configuration diagram of the present invention. A service center (hereinafter, referred to as a center) 4 that provides information such as route information to a mobile body (vehicle in this case) 2 and a plurality of vehicles 2 via a telephone exchange 6 and a cellular telephone base station 3. They are connected by public lines. The center 4 constantly receives traffic information from an external traffic information center 51, and can provide the latest road information based on road conditions that change every moment.

FIG. 2 shows the configuration of the vehicle-mounted device 7 provided in the vehicle 2. The vehicle-mounted device 7 includes a GPS antenna 21 for receiving a signal from a GPS satellite, and a GPS antenna 2.
1, a GPS receiver 22 for positioning the current position, a cellular telephone 24 connected to the center 4 via a public line to transmit and receive digital data via a cellular telephone antenna 23, a speaker and a microphone for voice conversation, and voice. A controller 25 having a synthesizing circuit 27, a display 22 for performing various displays such as a position or a message, a microphone 19 for receiving a driver's voice, a speaker 30 for transmitting an output by voice synthesis to the driver, and information such as a route to the center. A service switch 15 for making a provision request, an emergency switch 14 for notifying an emergency situation to the outside, and an ON / OFF switch 16 for voice switching are provided. The voice synthesizing circuit 27 and the display 20 are used for route guidance in navigation.

The service switch 15 is a route guidance service,
It is used for the purpose of making a communication connection to the center 4 for performing a load service, an information providing service, and various reservations. When this switch 15 is pressed, the LE built in
The D lamp flashes and is connected to the center 4. Thereafter, the connection to the center 4 is made, and when it becomes possible to make a call, the state is switched to a lighting state.

The emergency switch 14 is a switch to be pressed in an emergency, and operates in the same manner as the service switch 15,
It is connected to an emergency response desk in the center 4 and is accepted with a high priority.

The ON / OFF switch 16 is a switch for turning on / off audio output (navigation guidance, information output, etc.).

In such a configuration, by pressing the emergency switch 14 in an emergency such as a theft or an accident, the vehicle is automatically connected to the center 4, and the vehicle ID and the vehicle position data are transmitted to the center periodically. At this time, conversation with the center operator is possible.

When a service request is made to the center 4, the service switch 15 is pressed to automatically connect to the center 4, and the vehicle ID and vehicle position data are periodically transferred to the center. Conversation is possible. Through the conversation with the operator, various service requests can be made and information data can be obtained. For example, in the case of navigation, when the operator is notified of the destination, the center searches for the destination, searches for guidance route data from the current location, and sends it to the vehicle. When the route data is received, the guidance operation is automatically started. This can be stopped by pressing the ON / OFF switch 16.

Next, the service center 4 will be described with reference to FIG. The center 4 has a map database 54 therein, and is equipped with a computer 44 for performing a destination search and a route search using this database information. It is connected to the traffic information center 51 when searching for a route, has a traffic information memory 52 so that the latest traffic information can be reflected, and data is constantly updated with information sent from the traffic information center 51.

On the other hand, the computer 44 has a plurality of terminal devices 41 and 4 for receiving service information from the vehicle 2.
43 are connected to each other to perform vehicle ID, position confirmation, and data transmission / reception in response to the input service or emergency service request. In this case, each terminal is provided with an operator (not shown), and the request can be transmitted by speaking with the operator by voice conversation. Each of the terminal devices 41, 42,... 43 is connected to a public line. After the route data DT is transmitted to the vehicle 2 that issued the request, the identification data ID (I
D1 to IDm) and accumulate the search results in the memory 53 for a certain period of time (for example, 1.5 times the total travel time),
It is held in a format that allows for split transmission or retransmission.

When transmitting the route data DT from the center 4, the route data DT is divided into a plurality of blocks (BK1 to BKN) as shown in FIG. 4, and a data ID, a block number, a data The number of bytes of the data portion, the data portion, and a CRC code for error checking are added and transmitted. In this way, by dividing into blocks and adding additional data, when data transfer is interrupted or an error occurs, the remaining data is transferred again, or the memory of the vehicle overflows, It can be transmitted later.

Next, the configuration of the route data DT transmitted from the center 4 will be described with reference to FIG.

Before that, a route search is performed on the center side,
The route data DT obtained by the route search is composed of a plurality of guide points (maneuver points MP) existing from the starting point to the destination and the road shape data SP (see FIG. 5A). From this data, each guide point MP * (*: 1
4) A guide message can be output every time, and map matching is performed from the road shape data SP *.
A guide point can be determined by calculating a position on the route.

The transmission data (route data) DT from the center 4 shown in FIG. 5 (b) is roughly composed of header data HDT and a plurality of guidance data (guide data 1 to guide data N) GDT.

The header data HDT is the total number of data bytes,
It consists of the number of guide points including the starting point and the destination, the total distance from the starting point to the destination, and the total traveling time. The guidance data GDT includes message data including a basic style, latitude /
It is composed of guide point position coordinates including longitude, section road distance, section travel time, road attribute, guide point shape, and road shape data. Further, the road shape data RDT includes information on the number M of road points and the latitude / longitude of the road shape data (X *,
Y *).

Next, the processing of the vehicle-mounted device 7 on the vehicle side will be described.
This will be described with reference to the flowchart of FIG. When the ignition switch (not shown) is turned on in the vehicle-mounted device 7, power is supplied to the controller 25, and the program is started. First, in step S101, initial setting of the vehicle-mounted device 7 is performed, and in step S102, the current position (current position) is determined based on a signal received by the GPS receiver 22.
Is detected. In the next step S103, it is checked whether or not the emergency switch 14 has been pressed and turned on.

When the emergency switch 14 is on, an instruction to connect to the center 4 is output to the cellular telephone 24 in step S104, and when the connection with the center 4 is confirmed,
In step S105, the current position data, the vehicle ID, the vehicle information, and the like from the GPS satellite 10 are periodically transmitted every two seconds until the emergency switch 14 is turned off. Step S1
If the state of the emergency switch 14 is turned on in 06, the process returns to step S105. During this time, the driver can talk with the operator on the center side and can transmit the requirements. Thereafter, in step S107, when the emergency switch 14 is turned off, the line is disconnected and the process returns to step S102.

On the other hand, when the emergency switch 14 is off, when the route data DT is registered in step S108, the traveling position on the route is determined by map matching with the current position, and the guide point MP on the route data is determined. At the timing when the vehicle has passed the designated distance point before, a guidance message is displayed by voice synthesis display or the like. Thereafter, in step S109, the received route data DT is checked to determine whether there is data from the current point to a specified time ahead (several tens of minutes) based on the sectioned travel time. In step S117, communication is established with the center 4, and in step S118, the data ID and the vehicle I
D, the missing block number is transmitted. In step S119, the corresponding route data (after the missing block number) is transmitted from the center 4, and thereafter, in step S1.
At 23, the line to the center 4 is disconnected, and the process returns to step S102.

On the other hand, if there is the previous data in step S109, a route departure check is performed in step S110. As shown in FIG. 7, the route departure check detects a state in which the result of the map matching deviates from the route data DT transmitted from the center 4 and the planned route is no longer found in an area having a radius R centered on the current location. . As a result, in the case of the route departure state, step S
After the communication connection to the center 4 at 120, step S
The vehicle ID and the current position data are transmitted at 121, the route search is performed again at the center side, the route data obtained by the route search is received at step S122, and the reception from the center 4 is completed. In step S123, the line with the center 4 is disconnected, and the process returns to step S102.

If the route has not been departed in step S110, it is checked in step S111 whether there is an incoming call from the center. If there is an incoming call from the center 4, a route change service accompanying a change in traffic information is activated. Since the situation is provided by the center 51, step S1
In step 21, the data ID and the current position data are transmitted, and a route search is performed in the center.
The route data is received at 22 and the line is disconnected at step S123.

On the other hand, if there is no incoming call from the center 4 in step S111, it is checked in step S112 whether or not the service switch 15 for requesting the center to provide information is pressed. Returning to S102, if it is turned on, it connects to the center 4 in step S113, and periodically transmits the vehicle ID and the current position in step S114 until the route data DT from the center 4 is received in step S115. I do. During this time, the driver and the operator similarly have a conversation, and the operator operates the terminal based on the driver's request to prepare various data. Then, after transmitting these various data to the vehicle, and receiving the data on the vehicle side, the line with the center 4 is disconnected and the process returns to step S102.

Next, the processing of the center 4 will be described with reference to FIG. Although the processing on the center side is diversified, here, only the part related to transmission and reception of the route data DT with the vehicle 2 will be described.

When the operation of the computer 44 of the center 4 is started and the program processing is started, step S20
After the initial processing in 1, it is checked whether there is a route request from the vehicle 2. If there is a request for the route data DT in step S202, whether it is a new route request or a request for the remaining partial block of the existing data,
It is checked whether the request is a re-search request for a deviation from the route. This can be determined by a request code issued from the vehicle 2.

If it is new, the current position and the destination are determined in step S209 (performed by the operator), and a route search is performed in step S210. 53, transmitted in step S219,
In step S220, the line is disconnected, and the process proceeds to step S207. When a partial block is requested, step S212 is performed.
In step S213, the data ID (path ID) and the requested block number are checked, and the corresponding data is searched from the search result memory 53 (see FIG. 3) in step S213, and the specified block is transmitted in step S219 and the line is disconnected. Then, the process proceeds to step S207. Further, at the time of a re-search request, the current position and the route ID (data ID) are confirmed in step S215, the corresponding route data is fetched from the search result memory 53 in step S216, and the route is searched again in step S217 using this, and step S218 is performed. Then, this is replaced with the old route data, stored and retained, and transmitted to the vehicle 2 in step S219. When the transmission is completed, the line with the vehicle 2 is disconnected in step S220, and the process proceeds to step S207.

On the other hand, if there is no route data request in step S202, the incoming traffic information is checked in step S203. If new information is received, the effect on the storage route is checked in step S204. Is checked to see if there is any path data DT affected thereby. Therefore, when there is the route data DT which is affected, in step S206, the communication connection is sequentially performed with the vehicle 2 using the data, and the current position of the vehicle 2 is confirmed based on the information from the vehicle 2 and re-established. A route search is performed, and route data obtained by performing the route search is stored and transmitted to the corresponding vehicle 2. Thereafter, in step S207, a time check of the storage path is always performed, and a time exceeding a predetermined time (1.5 times of the entire process time is used as a reference time) is deleted.
Returning to step S202, the above processing is repeated.

[0036]

According to the present invention, position detection is performed by a mobile unit, and the mobile unit outputs its position information and a request for a route to a destination to the center using a line to the center. In an information exchange system for performing a search using a database held by the center in response to a route request and transmitting route data obtained by the search to a mobile unit, the mobile unit transmits the route data to the mobile unit based on the route data transmitted from the center. On the other hand, if it is deemed to be a departure compared with the current position, the connection from the mobile to the center is automatically made, and the mobile outputs a re-route request to the center together with the identification ID and the current position data. Then, the center performs a re-search based on the identification ID and transmits new route data to the mobile unit, so that the mobile unit is In the case of disconnection, the connection from the mobile unit to the center is automatically made, the mobile unit outputs a re-route request together with the identification ID and the current position data to the center, and the center performs a re-search based on the identification ID. Then, new route data is transmitted to the moving object. For this reason, since the automatic processing of the re-search is performed, the driver is not bothered.

In this case, the route data is divided into blocks,
If transmission is performed from a block closer to the current position of the moving object, path data can be divided and transmitted, and transmission can be performed more efficiently by transmission from a block closer to the current position.

Further, if the center adds the identification ID to the route data transmitted to the moving object and holds the route data for a certain period of time, the route data can be retransmitted based on the identification ID.

Further, in the center, new traffic information is input from an external traffic information center, and if there is a moving body affected by the traffic information in the stored route data, the center is sent to the corresponding moving body. Automatic connection is made from the side, route data based on traffic information is searched based on information on the current position from the mobile, and if it is sent to the mobile, it is based on information from the traffic information center Since the route data is provided to the moving body, the center can search for the route data corresponding to the ever-changing traffic condition, and the accurate route data can be provided to the moving body.

In addition, the mobile checks whether or not the route data received a predetermined time ahead is received in the route data received. If the data is not received a predetermined time ahead, the route to the center is determined. If data transmission is requested, partial transmission can be performed without transmitting all route data, so that efficient data transmission can be performed.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an information exchange system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a vehicle-mounted device in a mobile body in the information exchange system according to the embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a center in the information exchange system according to the embodiment of the present invention.

FIG. 4 is a diagram schematically illustrating transmission data (route data) from a center in the information exchange system according to the embodiment of the present invention.

5A is a diagram showing an outline of guide points of route data and road shape data, and FIG. 5B is a data format of data (route data) transmitted from a center.

FIG. 6 is a flowchart showing processing on the mobile body side in the information exchange system according to the embodiment of the present invention.

FIG. 7 is a diagram illustrating an outline of a leaving determination in the information exchange system according to the embodiment of the present invention.

FIG. 8 is a flowchart showing processing of a center in the information exchange system according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Information exchange system 2 Moving body (vehicle) 4 Center (service center) 51 Traffic information center 52 Traffic information memory 53 Search result memory 54 Map database (database) DT Route data BK1, BK2, BK3, BKn block

Claims (5)

[Claims] 1. A mobile unit performs position detection, and the mobile unit outputs its position information and a route request to a destination to the center using a line to the center, and the center responds to the route request. An information exchange system for performing a search using a database held by the center and transmitting route data obtained by the search to a mobile unit, wherein the mobile unit has a current position with respect to the route data transmitted from the center. If it is considered a withdrawal compared to,
The connection from the mobile unit to the center is automatically made, the mobile unit outputs a re-route request together with the identification ID and the current position data to the center, and the center performs a re-search based on the identification ID. And transmitting new route data to the mobile unit. 2. The information exchange system according to claim 1, wherein the route data is divided into blocks and transmitted from a block closer to a current position of the moving object. 3. The information exchange system according to claim 2, wherein the center adds an identification ID to the route data transmitted to the mobile unit and holds the route data for a predetermined time. 4. At the center, new traffic information is input from an external traffic information center, and when there is the moving object affected by the traffic information in the held route data, the relevant moving 4. The information according to claim 3, wherein an automatic connection is made to the body from the center side, a route data based on traffic information is searched based on information on a current position from the mobile body, and the route data is transmitted to the mobile body. Exchange system. 5. The mobile unit checks whether or not the route data received a predetermined time ahead is received in the received route data. The information exchange system according to claim 4, wherein the information exchange system requests transmission of route data.