JP2000055683A - Navigation device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cause no confusion to a driver while frequent renewal of a traveling route for guiding is avoided. SOLUTION: In this navigation device, in the case where it is decided that a ratio of an estimated average vehicle speed to a destination calculated based on a traveling route during traveling-guiding at the present in step Sa8 and an estimated average vehicle speed to the destination calculated in step Sa7 based on the latest traveling route received in step Sa6 is not less than a ratio set in step Sa2, it advances to step Sa9 and the traveling route during traveling- guiding at the present is renewed to the latest traveling route received in step Sa6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle navigation system for guiding a driver to a destination in an external traffic control center based on a travel route searched in consideration of real-time traffic congestion, accidents and construction conditions. Related to the device.

[0002]

2. Description of the Related Art Today, traffic management systems for appropriately allocating and guiding traffic volumes and traffic flows are being developed in order to cope with road traffic in overcrowded cities. This traffic management system is installed on a general road, and includes an information collection system including a vehicle sensor that collects information such as traffic volume, speed, and vehicle type, and a traffic jam length based on information collected by the information collection system. A traffic control center that calculates saturated traffic volume, travel time, and the like, and traffic information such as traffic congestion length and travel time calculated by the traffic control center are transmitted to a communication device such as a beacon or the like installed on the roadside.
It is composed of an information providing system that provides the driver of each vehicle with M multiplex broadcasting or the like.

Further, in each vehicle, a function of receiving the traffic information provided from the above-described traffic management system is added to a vehicular navigation device that guides a driver to travel to a destination. Is displayed on the display device of the vehicle navigation device, or the travel information provided by the traffic management system is searched by searching for a traveling route to the destination set by the driver in consideration of the received traffic information. I use.

Further, in the above traffic management system, based on the current position information and the destination information of the vehicle transmitted from the vehicle navigation device mounted on each vehicle,
A dynamic route guidance system that calculates a travel route that can reach a destination in the shortest time by a traffic control center and transmits the calculated route to a vehicle navigation device of each vehicle is being put into practical use.

[0005] In this dynamic route guidance system, a traffic control center responds to traffic conditions that change every moment.
The travel route is recalculated at regular intervals, and each vehicle navigation device updates the latest travel route recalculated at the traffic control center as needed.
By densely updating the traveling route in this way, the aim is to respond quickly to traffic conditions and to reach the destination in the shortest time.

[0006]

However, in the case of the above-described route guidance system, the traveling route is updated in the traffic control center every certain time, and therefore, the optimal route is not optimal from the viewpoint of shortening the arrival time at the destination. Although there is
Therefore, the traveling route may be frequently changed, and the driver may be confused. Further, for example, if the arrival time is only a few minutes earlier, it is not possible to meet the demand of the driver who wants to travel along the original traveling route without updating the traveling route.

[0007] The present invention has been made in view of the above-mentioned circumstances, and does not unconditionally update the latest travel route recalculated by the traffic control center, but updates the travel route update condition set by the driver. It is an object of the present invention to provide a vehicular navigation device that does not confuse the driver while avoiding frequent updating of the guided traveling route by updating the traveling route according to the following.

[0008] Further, by making it possible for the driver to select the types of update conditions of the travel route that can be set, the update of the travel route reflecting a wide range of driver needs can be avoided while avoiding frequent updates of the travel route to be guided. It is an object of the present invention to provide a navigation device for a vehicle that enables the following.

[0009]

According to a first aspect of the present invention, there is provided a vehicular navigation apparatus for receiving the latest travel route received from a traffic control center on a travel route currently being guided. Update condition setting means for setting conditions for updating the route (e.g., corresponding to the update condition setting screen of step Sa2 of FIG. 2 and FIG. 3 or the update condition setting screen of FIG. 5 and step Sb2 of FIG. 5). And, based on the traveling route during the traveling guidance and the latest traveling route, determine whether or not the condition set by the update condition setting means has been satisfied. Travel route updating means for updating the travel route (for example, step Sa in FIG. 2 in the embodiment)
4 to Sa9 or steps Sb4 to Sb9 in FIG. 5).

With the above-described configuration, only when the traveling route guided to the driver satisfies the updating condition set by the updating condition setting means, the latest traffic calculated at the traffic control center from the currently guided traveling route. Is updated to the travel route.

The invention described in claim 2 is the first invention.
In the vehicle navigation device according to the above, the update condition setting means travels according to the latest traveling route with respect to an average vehicle speed from the current position to the destination of the vehicle when traveling according to the traveling route in the traveling guidance. Setting the ratio of the average vehicle speed from the current position of the vehicle to the destination (for example, FIG. 2 in the embodiment)
Step Sa2 and the update condition setting screen of FIG. 3), and the travel route updating means, if the ratio of the average vehicle speed is equal to or more than the ratio set by the update condition setting means, Update to the traveling route (for example, steps Sa8 and Sa9 in FIG. 2 in the embodiment)
).

With the above-described configuration, the ratio of the average vehicle speed from the current position to the destination when traveling along the latest traveling route with respect to the average vehicle speed from the current location to the destination when traveling along the traveling route currently being guided is: When the ratio becomes equal to or more than the ratio set by the update condition setting means, the traveling route guided to the driver is updated.

[0013] The invention described in claim 3 is the first invention.
In the vehicle navigation device according to the above, the update condition setting means may include a time required to reach the destination when the vehicle travels along the travel route in the travel guidance, and the destination when the vehicle travels along the latest travel route. Set the time difference from the time required (for example,
5 (in the embodiment, corresponds to the update condition setting screen in FIG. 5 and FIG. 6), and the travel route updating means determines that the time difference between the required arrival times is equal to or greater than the time difference set by the update condition setting means. If there is, the route is updated to the latest traveling route (for example, FIG.
(Corresponding to steps Sb8 and Sb9).

With the above-described configuration, the time difference between the required time from the current position to the destination when the vehicle travels along the currently guided travel route and the required time from the current location to the destination when the vehicle travels along the latest travel route is calculated as follows: When the time difference is equal to or greater than the time difference set by the update condition setting means, the traveling route guided to the driver is updated.

The invention described in claim 4 is the first invention.
In the vehicular navigation apparatus according to (1), a plurality of update condition setting means (for example, steps Sa2 in FIG. 2 and FIG.
Update condition setting screen, the update condition setting screen of FIG. 5 and the update condition setting screen of FIG. 6, and the update condition selection screen for selecting one of the plurality of update condition setting means. Means (e.g., corresponding to step Sc2 in FIG. 7 and the update condition selection screen in FIG. 8 in the embodiment), wherein the traveling route update means updates the update condition setting means selected by the update condition selection means. Whether the condition is satisfied or not is determined based on the traveling route during the traveling guidance and the latest traveling route, and when the condition is satisfied, the traveling route is updated to the latest traveling route (for example, in the embodiment). In step Sc2 of FIG. 7, if the average vehicle speed is selected, the processing from step Sa2 onward in FIG. 2 is performed. If the required time is selected, the processing from step Sb2 onward in FIG. Equivalent) is characterized in that the point of treatment.

With the above-described configuration, it is possible to select the contents of the condition for updating the currently guided traveling route to the latest traveling route according to the driver's intention, and to travel according to the condition selected by the driver. The route is updated.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 is a block diagram showing a configuration of a first embodiment of a vehicle navigation device according to the present invention. In this figure, 1 is a navigation E
A CU (Electrical Control Unit), which stores a navigation program stored in a ROM, a CPU that performs processing in accordance with the navigation program stored in the ROM, and a RAM that temporarily stores various data generated during processing by the CPU. Has become. In addition, the above R
By executing the navigation program stored in the OM, each part of the vehicle navigation device is controlled, the current position of a vehicle equipped with the vehicle navigation device shown in FIG. It sends and receives various data to and from the traffic control center, and provides guidance to the destination set by the driver according to the travel route calculated by the traffic control center.

2 is a GPS (Global Positioning System)
m) A receiver that receives radio waves from a plurality of GPS satellites via the GPS antenna 2a and measures the current position of the vehicle based on the time difference between the reception of radio waves from each GPS satellite. Reference numeral 3 denotes a vehicle speed sensor which outputs a signal corresponding to the traveling speed of the own vehicle. Reference numeral 4 denotes a yaw rate sensor which outputs a signal corresponding to the traveling direction of the own vehicle. Further, the navigation ECU 1 obtains current position data (coordinate values) of the own vehicle based on the current position measured by the GPS receiver 2 and signals from the vehicle speed sensor 3 and the yaw rate sensor 4.

Reference numeral 5 denotes an operation unit including a keyboard and a joystick, which is used when operating a navigation device, setting a destination, and the like. Reference numeral 6 denotes a beacon transceiver which transmits the current location data (coordinate values) obtained by the navigation ECU 1 and the destination data (coordinate values) set by the operation unit 5 to a beacon installed on the roadside (hereinafter, a roadside beacon). ) To an external traffic control center. Further, based on the transmitted current location data and destination data, the data of the traveling route calculated by the traffic control center is received from the roadside beacon described above.

Reference numeral 7 denotes a modem, which transmits / receives current position data, destination data, and travel route data of the own vehicle to / from the traffic control center via the mobile phone 8. Reference numeral 9 denotes a map database, which stores road map data and road information in various parts of Japan. Here, the road information includes a stop point,
Traffic regulation information including position data (coordinate values) such as lane regulation positions, coordinate values of each node corresponding to a junction / branch of a road intersection / highway on a map, and a line connecting adjacent nodes (hereinafter referred to as a line connecting adjacent nodes) , A link), the distance of each link (link distance) and travel time (link travel time), and the type of road such as a national road, a prefectural road, or an expressway stored corresponding to each link. In addition, the map database 9 stores the above-described road map data and a CD-recorded road information.
It is composed of a recording medium such as a ROM and a reading device for reading information recorded on the recording medium.

Reference numeral 10 denotes a display, based on information stored in the map database 9, a road map around the current position of the vehicle, a traveling route received from the traffic control center, a traveling direction in which the vehicle is to travel, When a car approaches an intersection or a junction, various information for the driver, such as a simplified shape of the intersection or the junction, is displayed. 11
Is a speaker, which generates a voice for instructing a driver on a course to be selected at a branch point.

Next, the operation of the above-described vehicle navigation device will be described with reference to the flowchart shown in FIG. First, when a desired destination is set from the operation unit 5 by the driver in step Sa1, step Sa1 is performed.
2 and conditions for updating the traveling route received from the traffic control center as shown in FIG. 3 (hereinafter referred to as update conditions).
Is displayed on the display 10. Here, the update condition includes the distance from the current position to the destination when the vehicle travels according to the currently guided traveling route and when traveling according to the latest traveling route recalculated in consideration of the real-time traffic condition at the traffic control center. (Hereinafter, in the present embodiment, the value of the set ratio is referred to as an update condition setting value).

For example, when the driver sets the update condition to "5%" on the update condition setting screen shown in FIG.
When it is predicted that the average vehicle speed from the current position to the destination when traveling according to the traveling route currently being guided is 40 km / h, and the vehicle travels according to the latest traveling route recalculated in the traffic control center, If it is predicted that the vehicle can travel at an average vehicle speed of 42 km / h or more from the current position to the destination (that is, the average vehicle speed is 5% or more faster), the traveling route currently being guided is updated with the latest recalculated travel route. It is updated to the traveling route (details will be described later).

When "Always" is set on the update condition setting screen shown in FIG.
1 always updates the latest travel route received from the traffic control center until the vehicle reaches the destination, and guides the driver according to the updated latest travel route.

Next, the process proceeds to step Sa3, where the current position data of the own vehicle is obtained based on the current position measured by the GPS receiver 2 and each signal from the vehicle speed sensor 3 and the yaw rate sensor 4, and is set in step Sa1. The data is transmitted to an external traffic control center via the beacon transceiver 6 or the modem 7 and the mobile phone 8 together with the destination data.

Thus, the traffic control center calculates a traveling route that can reach the destination set by the driver in the shortest time based on the received current position data and destination data and the collected traffic information, The travel route obtained as a result is transmitted to the vehicle navigation device of this embodiment via a roadside beacon or a telephone line. When the data of the traveling route transmitted from the traffic control center is received by the beacon transceiver 6 or the mobile phone 8 and the modem 7, the process proceeds to step Sa4 to calculate the predicted average vehicle speed.

Here, the predicted average vehicle speed is a value obtained by dividing the route length from the current location to the destination by the required time when the vehicle travels according to the travel route received from the traffic control center. The above-described route length and required travel time are based on the link distance and link travel time received from the traffic control center based on the link distance and link travel time recorded in the map database 9, respectively. Is determined by adding the current location to the destination.

Next, the process proceeds to step Sa5, where
The average predicted vehicle speed calculated in step 4 is stored in the RAM in the navigation ECU 1 as a reference average predicted vehicle speed. The reference predicted average vehicle speed is used as a reference when the traffic control center determines whether or not to update to the latest recalculated traveling route. Next, proceeding to step Sa6, similarly to the processing in step Sa3, the current position data of the own vehicle is obtained based on the current position measured by the GPS receiver 2 and each signal from the vehicle speed sensor 3 and the yaw rate sensor 4, and step Sa1 Along with the destination data set in the above, via the beacon transceiver 6, or the modem 7 and the mobile phone 8,
Send to external traffic control center.

Thus, the traffic control center determines a travel route that can reach the set destination in the shortest time based on the received current position data and destination data and the traffic information collected at that time. Recalculation is performed, and the travel route obtained as a result is transmitted to the vehicle navigation device of the present embodiment. Then, the travel route data transmitted from the traffic control center via the beacon transceiver 6 or the mobile phone 8 and the modem 7 is received as the latest travel route.

Then, the process proceeds to Step Sa7, and the predicted average vehicle speed for the latest traveling route is calculated by the calculation method described in Step Sa4. Proceeding to step Sa8, first, a predicted average vehicle speed change rate is calculated. This predicted average vehicle speed change rate is obtained by calculating the predicted average vehicle speed of the latest traveling route calculated in step Sa7 by R
This is a value obtained by dividing by the reference predicted average vehicle speed stored in the AM. Then, it is determined whether or not the calculated predicted average vehicle speed change rate is equal to or greater than the update condition set value set in step Sa2. That is, for example, in step Sa2 described above, when the driver sets the update condition setting value to “10%” on the update condition setting screen shown in FIG. 3, the calculated predicted average vehicle speed change rate is 1.10 or more. Is determined.

If the calculated predicted average vehicle speed change rate is less than the value obtained by adding 1 to the travel route update condition set value, the determination result is NO, the process proceeds to step Sa11, and the latest received at step Sa6. The traveling route guidance is performed according to the current traveling route (the traveling route received in step Sa3 immediately after the startup) without updating to the traveling route of (1). In step Sa2, if “always” is selected as the update condition setting value,
The determination result at a8 is always YES.

Here, the traveling guidance performed in step Sa11 is the same as the guidance provided by a conventional vehicle navigation system (for example, the display 10 displays a road map around the current position of the vehicle, the traveling information received from the traffic control center). Displays the route, the current position of the vehicle and the direction of travel, and displays various information for the driver, such as the simple shape of the intersection or junction, when the vehicle approaches the intersection or junction. At the branch point, the driver is instructed by voice from the speaker 11 on the course to go), and the detailed description is omitted.

On the other hand, if the calculated predicted average vehicle speed change rate is equal to or greater than the value obtained by adding 1 to the update condition set value in step Sa8, the determination result is YES, and step S8 is performed.
Proceeding to a9, the running route currently displayed on the display 10 (the running route received in step Sa3 is displayed immediately after startup) is updated to the latest running route received in step Sa6. At this time, as shown in FIG. 4, a message Me indicating that the traveling route is to be changed is displayed on the display 10 to the driver. In FIG. 4, M is a mark indicating the current position and traveling direction of the vehicle,
(Thick line portion) indicates the traveling route currently being guided.

Next, the process proceeds to step Sa10,
storing the predicted average vehicle speed calculated in a7 as a new reference predicted average vehicle speed in the RAM in the navigation ECU 1;
Update. Then, the process proceeds to step Sa11, and travel guidance is performed according to the latest travel route updated in step Sa9.

Next, the process proceeds to step Sa12, where it is determined whether or not the vehicle has reached the destination set in step Sa1. If it is determined that the vehicle has not reached the destination, the determination result is NO, and the process returns to step Sa6, and thereafter, steps Sa6 → Sa7 → Sa8 (→ Sa9)
→ Sa10) → Sa11 → Sa12 → Sa6 →... Then, in step Sa12, when it is determined that the vehicle has arrived at the destination, the determination result is YES, and the traveling guidance process ends.

[Second Embodiment] Next, a second embodiment of the vehicle navigation system according to the present invention will be described. The vehicle navigation device according to the second embodiment is different from the first embodiment in that the update condition of the traveling route is the ratio of the predicted average speed in the first embodiment, while the second embodiment is different from the first embodiment. The update condition of the traveling route is that a time difference between a required time to a destination when traveling according to a traveling route received in the past from the traffic control center and a required time when traveling the latest traveling route is set.

The operation of the vehicle navigation system according to the second embodiment will be described below with reference to FIG. Note that the hardware configuration of the vehicle navigation device according to the present embodiment is the same as that shown in FIG.
Since the configuration is the same as that described above, detailed description of each unit will be omitted.

First, when a desired destination is set by the driver from the operation unit 5 in step Sb1, the process proceeds to step Sb2, and a setting screen for setting update conditions as shown in FIG. . here,
In the case of the present embodiment, the update condition is determined based on the current route in the case where the vehicle travels according to the currently guided route and the case where the vehicle travels in accordance with the latest travel route recalculated in consideration of the real-time traffic condition in the traffic control center. The time difference is set by the time difference of the required time to the destination (hereinafter, in the present embodiment, the value of the set time difference is referred to as an update condition setting value).

For example, when the driver sets the update condition setting value to "5 minutes" on the update condition setting screen shown in FIG.
If it is determined that the required time when traveling according to the latest travel route recalculated at the traffic control center can arrive 5 minutes or more earlier than the required time from the current location to the destination, The traveling route being guided is updated to the latest recalculated traveling route (the details will be described later).

When "Always" is set on the update condition setting screen shown in FIG.
1 always updates the latest travel route received from the traffic control center until the vehicle reaches the destination, and guides the driver according to the updated latest travel route.

Next, the process proceeds to step Sb3, where the current position data of the own vehicle is obtained based on the current position measured by the GPS receiver 2 and each signal from the vehicle speed sensor 3 and the yaw rate sensor 4, and is set in step Sb1. The data is transmitted to an external traffic control center via the beacon transceiver 6 or the modem 7 and the mobile phone 8 together with the destination data.
Accordingly, the traffic control center calculates a traveling route that can reach the destination set by the driver in the shortest time based on the received current location data and destination data and the collected traffic information, and obtains a result. The determined travel route is transmitted to the vehicle navigation device of the present embodiment.

When the data of the traveling route transmitted from the traffic control center via the beacon transceiver 6 or the cellular phone 8 and the modem 7 is received, the step Sb
Proceed to 4 to calculate the time required from the current location to the destination. Here, the required time is obtained by adding the link travel time on the travel route received from the traffic control center from the current position of the own vehicle to the destination based on the link travel time recorded in the map database 9. Desired.

Next, the process proceeds to step Sb5, where step Sb
The required time calculated in 4 is stored in the RAM in the navigation ECU 1 as the reference required time. The reference required time is used as a reference when the traffic control center determines whether or not to update to the latest travel route recalculated. Next, the process proceeds to step Sb6, where the current position data of the own vehicle is obtained based on the current position measured by the GPS receiver 2 and each signal from the vehicle speed sensor 3 and the yaw rate sensor 4, as in the process at step Sb3. Is transmitted to an external traffic control center via the beacon transceiver 6 or the modem 7 and the mobile phone 8 together with the destination data set in the above.

Thus, the traffic control center re-establishes a traveling route that can reach the set destination in the shortest time based on the received current position data and destination data and the traffic information collected at that time. The calculated travel route is transmitted to the vehicle navigation device of the present embodiment. And the beacon transceiver 6, or
The travel route data transmitted from the traffic control center via the mobile phone 8 and the modem 7 is received as the latest travel route. Then, the process proceeds to step Sb7,
The required time for the latest traveling route is calculated by the calculation method described in b4.

Then, the process proceeds to a step Sb8, wherein the required time of the latest traveling route calculated in the step Sb7 is subtracted from the reference required time stored in the RAM in the navigation ECU 1 to calculate a time difference between the required times. Sb
It is determined whether or not the update condition set value (time difference between required times) set in step 2 is exceeded. If the calculated time difference of the required time is smaller than the update condition setting value, the determination result is NO, the process proceeds to step Sb11, and the process does not update to the latest traveling route received in step Sb6.
The driving route guidance is performed according to the current driving route (the driving route received in step Sb3 immediately after the startup).

If "always" is selected as the update condition setting value in step Sb2, the result of the determination in step Sb8 is always YES. Further, the traveling guidance performed in step Sb11 is similar to the processing in step Sa11 described in the first embodiment, and is similar to the conventional vehicle navigation device, and the detailed description is omitted.

On the other hand, if the time difference of the required time calculated in step Sb8 is equal to or greater than the set value of the update condition, the determination result is YES, the process proceeds to step Sb9, and the traveling route currently displayed on the display 10 (startup) Immediately after that, the traveling route received in step Sb3) is updated to the latest traveling route received in step Sb6. At this time, as in the first embodiment, as shown in the message Me in FIG. 4, the display 10 displays a message to the driver to change the traveling route.

Next, the process proceeds to step Sb10,
The required time calculated in b7 is stored and updated in the RAM in the navigation ECU 1 as a new reference required time.
Then, the process proceeds to step Sb11, and travel guidance is performed according to the latest travel route updated in step Sb9.

Next, the process proceeds to step Sb12, and it is determined whether or not the vehicle has reached the destination set in step Sb1. If it is determined that the vehicle has not reached the destination, the determination result is NO, and the process returns to step Sb6. Thereafter, steps Sb6 → Sb7 → Sb8 (→ Sb9)
→ Sb10) → Sb11 → Sb12 → Sb6 →... Then, in step Sb12, when it is determined that the vehicle has arrived at the destination, the determination result is YES, and the traveling guidance process ends.

[Third Embodiment] Next, a third embodiment of the vehicle navigation system according to the present invention will be described. The hardware configuration of the vehicle navigation device in the third embodiment is the same as the configuration in FIG. 1 shown in the first embodiment (thus, a detailed description of each unit is omitted). Of the travel route update condition described in the first and second embodiments (first
In the embodiment, the ratio of the predicted average vehicle speed, and in the second embodiment, the required time difference) can be selected.

That is, as shown in FIG. 7, when the vehicle navigation device according to the third embodiment is started,
First, in step Sc1, the driver operates the operating unit 5
When the desired destination is set from step S10, the process proceeds to step Sc2, and the update condition selection screen shown in FIG.
To be displayed.

When the driver clicks or selects the average vehicle speed button SB in FIG. 8, the processing from step Sa2 in the flowchart shown in FIG. 2 is performed. When the driver clicks or selects the required time button TB in FIG. 8, the process from step Sb2 in the flowchart shown in FIG. 5 is performed.

With this configuration, the driver can select an update condition having desired contents from a plurality of update conditions having different contents prepared in advance.

The route length and the required time used in calculating the predicted average vehicle speed in the first embodiment and the required time calculated in the second embodiment are recorded in the map database 9. Was calculated based on the link distance and the link travel time, but when the traffic control center sends the travel route along with the distance from the current location to the destination and the required time, those values are received and the predicted average It may be used for calculating the vehicle speed or as a required time.

[0055]

As described above, according to the first aspect of the present invention, the traveling route guided to the driver is:
Only when the update condition set by the update condition setting means is satisfied, the traveling route currently being guided is updated to the latest traveling route calculated at the traffic control center. It will not be updated, and it will be possible to guide the driving route without confusing the driver.

According to the second aspect of the present invention, the present vehicle travels according to the latest traveling route with respect to the average vehicle speed from the current location to the destination when traveling according to the traveling route currently being guided. If the ratio of the average vehicle speed up to the above is equal to or more than the ratio set by the update condition setting means, the traveling route to be guided to the driver is updated, so that frequent traveling route updates are avoided, The traveling route to be guided can be updated under conditions suitable for a driver who desires smooth traveling.

According to the third aspect of the present invention, the time required from the current position to the destination when the vehicle travels according to the currently guided traveling route, and the time from the current position to the destination when traveling along the latest traveling route. If the time difference between the required time until and the time difference is equal to or greater than the time difference set by the update condition setting means, the traveling route guided to the driver is updated, so that frequent traveling route updating is avoided while The traveling route to be guided can be updated under conditions suitable for the driver who wants to arrive at the destination in a short time.

According to the fourth aspect of the present invention, it is possible to select the contents of the condition for updating the currently guided traveling route to the latest traveling route according to the driver's will. Since the traveling route is updated according to the condition selected by the driver, the traveling route can be updated reflecting a wide range of driver requests.

[Brief description of the drawings]

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

FIG. 2 is a flowchart illustrating a processing procedure in the first embodiment of the vehicle navigation device according to the present invention.

FIG. 3 is a diagram showing an update condition setting screen in the first embodiment.

FIG. 4 is a diagram showing an example of a message displayed when a traveling route guided to a driver is updated in the first embodiment.

FIG. 5 is a flowchart showing a processing procedure in a second embodiment of the vehicle navigation device according to the present invention.

FIG. 6 is a diagram showing an update condition setting screen according to the second embodiment.

FIG. 7 is a flowchart showing a processing procedure in a third embodiment of the vehicle navigation device according to the present invention.

FIG. 8 is a diagram showing an update condition selection screen according to the third embodiment.

[Explanation of symbols]

 Reference Signs List 1 navigation ECU 2 GPS receiver 2a GPS antenna 3 vehicle speed sensor 4 yaw rate sensor 5 operation unit 6 beacon transceiver 7 modem 8 mobile phone 9 map database 10 display 11 speaker

Claims (4)

[Claims] 1. A current position and a destination of a vehicle are transmitted to a traffic control center outside the vehicle, a travel route to the destination calculated by the traffic control center is received, and a travel route to the destination is received according to the received travel route. An update condition setting means for setting a condition for updating a traveling route currently being guided to the latest traveling route received from the traffic control center; and a traveling route during the traveling guidance. And a travel route update unit that determines whether the update condition is satisfied based on the latest travel route and updates the latest travel route when the condition is satisfied. Vehicle navigation device. 2. The vehicle according to claim 1, wherein the update condition setting unit is configured to:
Setting a ratio of an average vehicle speed from a current position of the vehicle to the destination when the vehicle travels according to the latest traveling route, wherein the traveling route updating unit is configured to set the update condition setting to the update condition setting. 2. The vehicular navigation device according to claim 1, wherein when the ratio is equal to or greater than the ratio set by the means, the route is updated to the latest traveling route. 3. The update condition setting means includes: a time required to reach the destination when the vehicle travels along the travel route in the travel guidance; and a time required to travel to the destination when travels along the latest travel route. The travel route updating means, when the time difference of the required time is equal to or greater than the time difference set by the update condition setting means, updating the travel route to the latest travel route. The vehicle navigation device according to claim 1, wherein 4. A plurality of update condition setting means each having different contents of update conditions, and an update condition selection means for selecting any one of the plurality of update condition setting means. The travel route updating means determines whether or not the update condition of the update condition setting means selected by the update condition selection means is satisfied, based on the travel route during the travel guidance and the latest travel route. The vehicle navigation device according to claim 1, wherein when the condition is satisfied, the latest travel route is updated.