JPH1183521A - Route guidance equipment for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable changing a course at an intersection with margin by changing a guidance route when the residual distance as far as the intersection is greater than the distance necessary for course change at the next intersection in the case of guidance route change. SOLUTION: When a dynamic guidance route is obtained during traveling on this side of an intersection along a guidance route, and course change becomes necessary on account of guidance route change, firstly the change lane number N is obtained on the basis of the lane number of present traveling and the number of lanes and the lane number to be selected at the next intersection, the necessary distance L0 of lane change a lane is obtained according to the car velocity, and the necessary distance L for course change as far as the next intersection is obtained by using a formula of L=N.L0 +α(α is a specified margin distance). Secondly, the residual distance M as far as the intersection is operated, and the guidance route is changed to a new dynamic guidance route in the case of M>L, i.e., the case that margin is present. In the case of M<L, the guidance route is not changed but guidance is continued along the present guidance route.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle route guidance device for guiding an occupant to a destination along a dynamic guidance route calculated in consideration of road traffic information.

[0002]

2. Description of the Related Art There is known a vehicle route guidance device which calculates a dynamic guidance route to a destination in consideration of road traffic information provided from outside the vehicle (for example, Japanese Patent Application Laid-Open No. 6-18604).
No. 8).

[0003] A system for providing road traffic information from outside the vehicle includes VICS (Vehicle Information & Communication).
System) and ATIS (Advanced Trafic Information Sy)
is known, such as traffic jam information, required time information, traffic obstruction information such as accidents and construction, traffic regulation information such as closed roads and lane regulations, parking lot information, etc. by FM multiplex broadcasting, optical beacon, radio beacon, etc. Is provided.

[0004] Bidirectional communication with a roadside beacon is performed, and vehicle destination information is sent from the vehicle to the roadside beacon.
A DRGS that calculates a dynamic guidance route considering road traffic information to a destination at a road traffic information center and sends back the calculated dynamic guidance route information from the roadside beacon to the vehicle side
(Dynamic Route Guidance System) R & D
Promoted by S (Intelligent Transport System).

[0005] In this specification, a system for calculating a dynamic guidance route on the vehicle side based on road traffic information provided from outside the vehicle is called L-DRGS (Locally-DRGS). C-DRGS (Centra) is a system that sends the geographic information to calculate the dynamic guidance route in consideration of the road traffic information, and receives the computed dynamic guidance route on the vehicle side.
lly-DRGS).

The dynamic route guidance system includes a dynamic route guidance system using beacon communication using an optical beacon or a radio wave beacon, a dynamic route guidance system using FM multiplex broadcasting,
There is a dynamic route guidance system using a telephone line.

[0007]

By the way, if the route of the current guide route needs to be changed immediately before the intersection while traveling along the guide route, there is not enough room for the route change. In that case, the crew will be confused.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicular route guidance device that changes a guidance route so that a route can be changed with a margin at an intersection.

[0009]

[Means for Solving the Problems]

(1) According to the first aspect of the present invention, when a vehicle is guided along a dynamic guidance route, a route change required distance at a next intersection according to a guidance route change is calculated, and the distance to the next intersection is calculated. The remaining distance is calculated, and the guidance route is changed when the remaining distance is equal to or more than the required course change distance. (2) The vehicle route guidance device according to the second aspect calculates the required route change distance based on the number of lane changes at the next intersection and the required lane change distance per lane. (3) According to a third aspect of the present invention, a required lane change distance per lane is set according to a vehicle speed. (4) In the vehicle route guidance apparatus according to the fourth aspect, when the number of lane changes at the next intersection is zero, the required distance for the course change is set to a predetermined value.

[0010]

【The invention's effect】

(1) According to the first aspect of the present invention, it is possible to change the guidance route without forcibly changing the route to the occupant, change the route with a margin at the intersection, and improve the safety in the route guidance. . (2) According to the second aspect of the present invention, it is possible to obtain the required course change distance according to the number of lane changes at the intersection,
Even if the number of lane changes is large, the course can be changed with a margin and safety in route guidance can be improved. (3) According to the third aspect of the present invention, it is possible to obtain the required course change distance according to the vehicle speed, and to change the course with a margin even when the vehicle speed is high, thereby improving the safety in route guidance. . (4) According to the invention of claim 4, even at an intersection where the number of lane changes is zero, such as an intersection of one lane on one side, in addition to the distance for decelerating by depressing the brake pedal after operating the direction indicator. The distance to the occupant's attitude can be taken into account, and the course can be changed with a margin.

[0011]

FIG. 1 shows a configuration of an embodiment. The controller 1 includes a microcomputer and peripheral components such as a memory, and executes a control program to be described later to perform route guidance to a destination. The direction sensor 2, the distance sensor 3, the GPS receiver 4, the communication device 5, the storage device 6, and the input device 7 are connected to the controller 1.
The direction sensor 2 detects the traveling direction of the vehicle, and a distance sensor 3
Detects the traveling distance of the vehicle. The GPS receiver 4 receives a GPS signal from a satellite and detects a current position, a traveling direction, and the like of the vehicle. The storage device 6 is a device such as a CD-ROM for storing road map data, and the input device 7 is a device for inputting a destination, whether or not a route can be changed, and the like. The controller 1 is also connected with a display 8 for displaying a road map and character information, and a speaker 9 for performing voice guidance.

The communication device 5 communicates with facilities outside the vehicle and receives road traffic information and dynamic guidance route information. The communication device 5 includes a beacon transceiver for communicating with a roadside beacon transceiver, an FM receiver for receiving FM multiplex broadcasting, a vehicle-mounted telephone for communicating with a telephone base station, and the like.
Obtain road traffic information for RGS and dynamic guidance route information for C-DRGS.

FIGS. 2 to 4 are flowcharts showing a route guidance program executed by the controller 1.
The operation of the embodiment will be described with reference to these flowcharts. FIG. 2 is a flowchart illustrating a C-DRGS path communication interrupt. The service of the C-DRGS route is provided by road-to-vehicle communication when a vehicle passes a specific beacon, or provided by a vehicle-mounted telephone at predetermined time intervals or as needed. The controller 1 is interrupted by the start of the C-DRGS path service, and the controller 1 executes the interrupt processing shown in FIG. In step 1, first, destination data is transmitted to the road traffic information center. The road traffic information center calculates the shortest time route (C-DRGS route) to the destination based on a wide range of detailed road traffic information. In step 2, the C-DRGS route from the road traffic information center to the destination and the required time to the destination are received.

FIG. 3 is a flowchart showing a traffic information communication interruption. Road traffic information is provided from beacons, and is provided every 5 minutes in FM multiplex broadcasting. In addition, it is possible to periodically obtain road traffic information via the vehicle-mounted telephone. In this traffic information communication interruption, in step 11, surrounding road traffic information is received. In the following step 12, the L-DRGS route to the destination and the required time are calculated.

FIG. 4 is a flowchart showing a route guidance program. When the route guidance device is activated, the controller 1 starts executing this program. In step 31, the destination set by the occupant from the input device 7 is set. In the following step 32, it is confirmed whether the C-DRGS route or the L-DRGS route has been set, and if these dynamic guide routes have not been set, the process proceeds to step 33, where the static guide route to the destination is set. Is calculated. Here, the static guidance route is a guidance route to a destination calculated based on only the road map data stored in the storage device 6 without considering road traffic information. In step 34, route guidance is performed along the currently set guidance route. In step 35, it is confirmed whether or not the vehicle has arrived at the destination. If the vehicle has arrived at the destination, the route guidance is terminated.

In step 36, the C-DRGS route is received by the communication interrupt shown in FIG. 2 or the L-DRGS route is calculated by the communication interrupt shown in FIG. Check if it is necessary to change to a new dynamic guidance route.
If it is necessary to change the route, the process proceeds to step 37; otherwise, the process returns to step 34. If the route is to be changed, it is checked in step 37 whether the route of the current guide route must be changed at the next intersection when the guide route is changed. If the route must be changed at the next intersection with the change of the guidance route, the process proceeds to step 38; otherwise, the process returns to step 34.

In step 38, a required course change distance L is calculated. For example, it is assumed that a dynamic guidance route is obtained at point A when the vehicle is traveling along a guidance route just before an intersection as shown in FIG. 5, and it is necessary to change the route along with the route change. First, a changed lane number N is determined based on the currently running lane number, the number of lanes at the next intersection, and the lane number to be selected. Also, 1 according to the vehicle speed V
The required lane change distance Lo per lane is determined.

Here, K is a constant, and the higher the vehicle speed V, the longer the required lane change distance Lo per lane. Next, a required course change distance L at the next intersection is calculated by the following equation.

L = N · Lo + α where α is a predetermined margin distance.

For example, at the intersection of one lane on each side, the number N of lane changes becomes zero, and the required course change distance L becomes α.
When the course is changed at an intersection where the lane change number N is 0, for example, when the course is changed from straight ahead to left turn, the distance for decelerating by depressing the brake pedal after operating the direction indicator is operated. In addition, it is necessary to consider the distance to the occupant's attitude. Therefore, it is necessary to determine the margin distance α in consideration of the intersection where the lane change number N is zero.

In step 39, the remaining distance M to the intersection is calculated. In step 40, it is checked whether the remaining distance M to the next intersection is equal to or more than the required course change distance L at the next intersection, that is, whether there is room for a course change. If there is room to change course, proceed to step 41,
Change to a new dynamic guidance route. On the other hand, if the remaining distance M is less than the required course change distance L, in step 42, the guidance is continued along the current guidance route without changing the guidance route.

As described above, when it is necessary to change the route of the current guide route at the next intersection to another route at the time of changing to the newly obtained guide route, the route change at the next intersection is required. Calculate the distance and the remaining distance to the next intersection,
The two sides were compared to check if there was room for a course change, and if there was room, the guidance route was changed, and if there was no room, the guidance route was not changed. It is possible to improve the safety in route guidance without forcing a course change.

In the configuration of the above embodiment, the controller 1 constitutes required distance calculating means, remaining distance calculating means, and route changing means.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment.

FIG. 2 is a flowchart illustrating a C-DRGS path communication interrupt.

FIG. 3 is a flowchart showing a traffic information communication interrupt.

FIG. 4 is a flowchart showing a route guidance process.

FIG. 5 is a diagram for explaining a change determination of a guidance route.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Controller 2 Orientation sensor 3 Distance sensor 4 GPS receiver 5 Communication device 6 Storage device 7 Input device 8 Display 9 Speaker

Claims (4)

[Claims] 1. A vehicle route guidance device for guiding a vehicle along a dynamic guidance route, comprising: required distance calculation means for calculating a required route change distance at a next intersection in accordance with a change in a guidance route; A vehicle route guidance apparatus comprising: a remaining distance calculation unit that calculates a remaining distance of the vehicle; and a route change unit that changes a guidance route when the remaining distance is equal to or greater than the required route change distance. 2. The vehicle route guidance device according to claim 1, wherein the required distance calculating means calculates a required route change distance based on the number of lane changes at the next intersection and the required lane change distance per lane. A route guidance device for a vehicle, comprising: 3. The vehicle route guidance device according to claim 2, wherein the required distance calculation means sets a required lane change distance per lane according to a vehicle speed. . 4. The vehicle route guidance device according to claim 1, wherein the required distance calculation means determines a required route change distance when the number of lane changes at the next intersection is zero. A route guidance device for a vehicle, characterized in that the value is a value.