JP2014202543A - Route guidance device and method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a route guidance device for preventing the reverse run of a vehicle.SOLUTION: A map information DB 34 holds a map database, and reverse-run risk point information indicating a reverse-run risk at a specific point. An operation section 32 calculates a guide route from the map database on the basis of navigation information, and determines whether a point having the reverse-run risk is included in the guide route referring to the reverse-run risk point information. Then, the operation section 32 discriminates the necessity of reverse-run risk measures on the basis of the determination result, and creates reverse-run risk correspondence information on the basis of the discrimination result.

Description

  The present invention relates to a route guidance device and method for preventing reverse running of a vehicle.

  A case where a vehicle that runs backward on a motorway, such as an expressway, occurs due to the level of driving skill, cognitive decline due to aging, etc., or changes in the road traffic environment. Is known. In addition, the structure of entrance and exit roads of road service facilities (for example, service area (SA) and parking area (PA)) installed on expressways is difficult to understand, and as a result, the vehicle runs in the reverse direction. Is known as well.

  For the above case, detect an inappropriate U-turn, or compare the map data and the driving history to detect the reverse running state, and inform the driver that the vehicle is running in reverse, and drive normally. There is known a technique for taking a countermeasure for returning to (for example, Patent Document 1).

  The technology of Patent Document 1 estimates the destination of a vehicle using information on past travel routes, refers to information on past travel routes to the estimated destination, If there is, the driver is notified of reverse running warning information including the reverse route section.

  The technology of Patent Document 1 does not take into consideration that reverse running warning information cannot be reported without a reverse running history, and reverse running is likely to occur on roads that are unfamiliar to the driver. Further, depending on the driver and the driving situation, it is not always necessary to report the reverse running warning information, and it is desirable to report the reverse running warning information in consideration of the driver and the driving situation. In addition, the technique of Patent Document 1 cannot grasp the risk of reverse running of other vehicles.

  Furthermore, once the vehicle is in reverse running, there is a risk in returning from the reverse running state to normal running. Accordingly, there is a need for a technique for preventing the vehicle from going backward so that the driver is alerted before the reverse running actually occurs and the reverse running does not occur in the first place.

JP 2010-217014 JP

  An object of the present invention is to provide a route guidance device for preventing a vehicle from running backward.

  The present invention has the following configuration as one means for achieving the above object.

  The invention of claim 1 includes a map database, a holding unit for holding a reverse running risk point information indicating a reverse running risk at a specific point, a calculation unit for calculating a guide route from the map database based on navigation information, A determination unit that determines whether or not a point having a reverse running risk is included in the guidance route with reference to reverse running risk point information, and a determination that determines whether or not a reverse running risk response is necessary based on the result of the determination And a generation unit that generates reverse running risk correspondence information based on the result of the determination.

  In the invention of claim 2, when it is determined that the point having the reverse running risk is included in the guidance route, the determination unit acquires the reverse running risk evaluation value of the point from the reverse running risk point information. The determination is made based on the reverse running risk evaluation value.

  In the invention of claim 3, the determination unit acquires a driver risk evaluation value based on at least one of attribute information and driving history of a driver of a vehicle traveling on the guidance route, and the driver risk evaluation value The determination is made based on the sum of the reverse running risk evaluation values.

  In the invention of claim 4, the reverse running risk correspondence information includes position information of the point having the reverse running risk, and a sum of the driver risk evaluation value and the reverse running risk evaluation value of the point.

  The invention of claim 5 further includes a processing unit that presents route information indicating the guidance route based on the reverse running risk correspondence information and presents a reverse running risk based on the reverse running risk correspondence information.

  In the invention of claim 6, the processing unit causes the calculation unit to calculate an alternative guidance route when the guidance route includes a point where the sum value included in the reverse running risk correspondence information includes a predetermined value or more. .

  In the invention of claim 7, when the calculation of the alternative guide route is impossible, or when a link cost of a predetermined value or more occurs due to the alternative guide route, the processing unit, after notifying that, Presentation of the point information having the reverse running risk is included in the presentation of the route information.

  In the invention of claim 8, the processing unit includes the presentation of the point information having the reverse running risk in the presentation of the route information.

  In the invention of claim 9, the holding unit acquires the reverse running risk point information from an external storage device by communication.

  The invention of claim 10 further includes updating means for acquiring reverse running information of the vehicle by communication and updating the reverse running risk point information based on the acquired reverse running information.

  The invention of claim 11 further includes communication means for receiving the navigation information and transmitting the route information indicating the guidance route and the reverse running risk correspondence information to a transmission source of the navigation information.

  The invention of claim 12 transmits the navigation information and receives the route information indicating the guidance route from the transmission destination of the navigation information and the reverse running risk correspondence information, and the guidance based on the reverse running risk correspondence information. It has a processing unit for presenting route information indicating a route and presenting a reverse running risk based on the reverse running risk correspondence information.

  The invention of claim 13 further includes an input / output unit for inputting the navigation information and displaying the route information.

  According to the invention of claim 1, when a point having a reverse running risk is included in the guidance route and it is determined that a reverse running risk response is necessary, a point having a reverse running risk is avoided in advance or there is a reverse running risk. It is possible to generate reverse running risk correspondence information for warning the point to the driver and preventing the reverse running of the vehicle.

  According to the invention of claim 2, the reverse running risk of other vehicles can be taken into consideration in the determination of the reverse running risk correspondence.

  According to the invention of claim 3, at least one of the attribute information and the driving history of the driver of the vehicle traveling on the guidance route can be considered in the determination of the risk of reverse driving.

  According to the inventions of claims 4 and 5, the reverse running risk handling process can be controlled based on the information included in the backward running risk handling information. Also,

  According to the invention of claim 6, an alternative guide route can be calculated when the reverse running risk is high.

  According to the seventh and eighth aspects of the invention, it is possible to present a point having a risk of reverse running on the guidance route.

  According to the invention of claim 9, a large number of reverse running risk point information can be acquired.

  According to the invention of claim 10, the reverse running risk point information can be effectively updated.

  According to the invention of claim 11, it is possible to cause the server device that performs the route search to generate the reverse running risk correspondence information.

  According to the inventions of claims 12 and 13, it is possible to cope with a case where a smartphone or a tablet computer is used for the route guidance device.

The block diagram which shows the structural example of the vehicle navigation system of an Example. The flowchart which shows an example of the route search process which the calculating part of a server performs. The flowchart which shows an example of the route search process which the calculating part of a car navigation performs.

  Hereinafter, a route guidance system according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following, a vehicle navigation system will be described as an example in accordance with the purpose of preventing the vehicle from running backward, but the present invention is used for route guidance for the object for the purpose of preventing backward running of an object other than the vehicle. It can also be applied to the system.

[overall structure]
FIG. 1 is a block diagram illustrating a configuration example of a vehicle navigation system according to an embodiment.

  The vehicle navigation system (hereinafter referred to as system) 10 includes a vehicle navigation device (hereinafter referred to as car navigation) 14 mounted on the vehicle 12 and a route distribution server (hereinafter referred to as server) 16. The car navigation system 14 has a function of guiding a route to the destination to the driver of the vehicle 12, and has the following configuration.

  The communication unit 20 performs wireless communication with the server 16. The positioning signal receiving unit 21 receives a positioning signal of a satellite positioning system (for example, GPS). The vehicle state sensor 22 includes, for example, a vehicle speed sensor that detects the speed of the vehicle 12, a gyro sensor that detects the posture and traveling direction of the vehicle 12, a yaw rate sensor that detects the vertical direction of the center of gravity of the vehicle 12 and the angular velocity around the axis, and the like. Have.

  If the car navigation system 14 is a vehicle-mounted type, a vehicle state sensor 22 is usually provided. However, there are cases where the vehicle state sensor 22 does not exist, such as when the car navigation system 14 is a portable car navigation system or a combination of a smartphone or tablet computer and navigation software.

  The input / output unit 23 is, for example, a keyboard, a touch panel, a speaker, or a microphone that performs input / output of information in the car navigation system 14 such as input of navigation information and presentation of route information to the destination. Information that can be input as navigation information includes departure place, waypoint, destination, road conditions (for example, toll road priority, general road priority, distance priority, etc.).

  The calculation unit 24 controls each part of the car navigation 14, route search based on the navigation information, route guidance based on the route information (display of route information, voice guidance), the position of the vehicle 12 based on the positioning signal and the output of the vehicle state sensor 22 Various calculation processes such as calculation of the current position are performed. Also, a calculation process of a reverse running prevention process described later is performed. The storage unit 25 includes a nonvolatile memory such as a ROM that stores various programs and data, a RAM that functions as a work memory for the arithmetic unit 24, and the like.

  The map information database (DB) 26 is map information stored in a recording medium such as a hard disk or an optical disk, and is a map database for the calculation unit 24 to perform route search and route guidance. In the map information DB 26, information on links connecting nodes (hereinafter referred to as link information), connection information between links, information for distinguishing free roads (general roads) and toll roads (highways, etc.), reverse running described later Information about

  The computing unit 24 can not only perform route search based on the map information DB 26 but also cause the server 16 to perform route search and perform route guidance based on route information notified from the server 16 (hereinafter referred to as server route). The calculation unit 24 determines whether or not to acquire a server route based on the communication state with the server 16, and when the server route is acquired, the server route is given priority and route guidance is performed. If the server route has not been acquired, route guidance is performed based on the route searched based on the map information DB 26.

  The server 16 has a function of notifying the car navigation 14 of the navigation information notified from the car navigation 14, the current position information of the vehicle 12, and the server route searched based on a predetermined search condition, and has the following configuration.

  The communication unit 30 performs wireless communication with the communication unit 20 of each car navigation system 14. The input / output unit 31 is a keyboard or a monitor for inputting / outputting instructions and information in the server 16 such as an operation of the server 16 by an administrator. The arithmetic unit 32 performs various arithmetic processes such as control of each part of the server 16, search for a server route, and a reverse running prevention process described later. The storage unit 33 includes a recording medium such as a hard disk that stores various programs and data, a RAM that functions as a work memory of the arithmetic unit 32, and the like.

  The map information DB 34 is map information stored in a recording medium such as a hard disk or an optical disk, and is a map database for the calculation unit 32 to search for a server route. The map information DB 38 records a larger amount of detailed map information than the map information DB 28 of the car navigation 14, such as traffic information, construction information, speed limit information, toll road toll information, and information on reverse running, which will be described later. It is recorded.

[Prevention of reverse running]
Hereinafter, the reverse running prevention process for preventing the reverse running of the vehicle will be described.

Although the details will be described later, the vehicle navigation system 10 of the embodiment adds reverse running risk point information for each specific point, each link information, or each node stored in the map information DBs 26 and 34, for example. Then, the reverse travel risk based on the reverse travel risk point information is calculated for the route searched by the route search (hereinafter referred to as the guidance route), and the necessity of performing a new route search based on the reverse travel risk or the specific reverse The necessity of notifying the driver of the running risk (location, reverse running mode, etc.) is determined.

  The vehicle navigation system 10 proposes an alternative route excluding the reverse running risk route when the guidance route includes a route in which the reverse running risk exists (hereinafter referred to as a reverse running risk route). Alternatively, when traveling on the reverse travel risk route, the reverse travel is prevented beforehand by notifying the driver of a place / mode in which there is a possibility of reverse travel.

  The calculation of the reverse running risk takes into account the driver characteristics and history, considers other driving history recorded in the map information DB 34 of the server 16, and is a precaution when it is difficult to avoid the reverse running risk completely It can be applied in combination with technology such as

● Reverse-running risk point information The map information DB 26 of the car navigation 14 holds reverse-running risk point information at the time of shipping of the car navigation 14. The reverse running risk point information is downloaded from an external storage device such as the server 16 at a predetermined interval, when communicating with the server 16 or when the map information DB 26 is updated, and the reverse running risk point information held in the map information DB 26 is Updated to the latest information.

  When the computation unit 24 of the car navigation system 14 detects reverse running or attempted reverse running of the vehicle 12 on which the car navigation system 14 is mounted, the reverse running information is recorded in the map information DB 26 as a reverse running history, and the communication with the server 16 is performed. The reverse running information is uploaded to the server 16.

  The map information DB 34 of the server 16 maintains reverse running risk point information from reverse running information uploaded from the car navigation system 14 or information obtained separately. The reverse running risk point information held in the map information DB 34 is provided to the car navigation 14 at a predetermined interval, when communicating with the car navigation 14 or when the map information DB 26 is updated, and the reverse running risk point information held in the map information DB 26 Is updated to the latest information.

  The information to be obtained separately is information on reverse running accidents such as police agencies and news reports, and results of reverse running risk evaluation methods. Based on these information, places with high reverse running risk are added to the reverse running risk point information. In addition, information such as road renovation and in-service start is also obtained separately, and a point where the reverse running risk is reduced based on the information is deleted from the reverse running risk point information.

  The reverse run risk point information is composed of “Combine the flag for reverse run with position information such as latitude / longitude”, “Combine the reverse run flag for each link or node in the map information DB”, etc. Can do. When the former is adopted, it is determined whether or not the guide route includes a reverse risk route by determining whether or not the guide route is within a predetermined distance with respect to the position where the reverse flag is “present”. be able to. When the latter is adopted, it is possible to determine whether or not a reverse risk route is included in the guide route by determining whether or not the guide route passes through a link or node having a reverse flag of “Yes”. . In other words, the reverse running risk route is a place, link, or node near the position where the reverse running flag is “present”.

The following evaluation axis can be applied to the reverse running risk point information. That is, the reverse running risk point information includes not only the reverse running flag but also the following reverse running risk evaluation value Rr. The reverse running risk evaluation value Rr below is an example, and a value 0 to a value 1 may be assigned according to the risk of reverse running. Further, the reverse running risk evaluation value Rr at the position where the reverse running flag is “None” is 0.
─────────────────┬──────────
History etc. │ Reverse running risk evaluation value Rr
─────────────────┼──────────
Where reverse run occurs multiple times │ 1
Where reverse run occurred │ 0.8
Location where reverse running condition occurred │ 0.5
Road structure that easily causes reverse running * │ 0.3
A place where no reverse running / reverse running condition has occurred | 0
─────────────────┴──────────
* Based on risk assessment methods, not actual results

Route Search Processing When acquiring a server route, route search processing including reverse run prevention processing is executed by the computing unit 32 of the server 16. When the server route is not acquired or cannot be acquired because the communication state with the server 16 is poor, the route search process including the reverse run prevention process is executed by the calculation unit 24 of the car navigation 24.

  FIG. 2 is a flowchart illustrating an example of a route search process executed by the calculation unit 32 of the server 16.

  The calculation unit 32 receives the navigation information and the current position information of the vehicle 12 from the car navigation system 14 (S11), and calculates a guidance route with reference to the map information DB 34 (S12). Then, the reverse risk point information along the guide route is extracted from the map information DB 34 (S13), and it is determined whether the reverse route is included in the guide route based on the reverse flag of the reverse risk point information ( S14).

  When it is determined that the reverse running risk route is included in the guidance route, the calculation unit 32 acquires the reverse running risk evaluation value Rr of the reverse running risk route (S15), and requests the car navigation 14 to obtain the driver risk evaluation value Rd. Is received (S16). Then, the total risk evaluation value R (= Rr + Rd) of each reverse running risk route is calculated (S17), and the necessity (necessity) of dealing with the reverse running risk is determined based on the total risk evaluation value R (S18). ). Although details will be described later, the driver risk evaluation value Rd is an evaluation value in consideration of the driver's attribute information and driving history, and the reverse risk path (hereinafter referred to as required) where the overall risk evaluation value R is equal to or greater than a predetermined threshold Rth. If there is a response route), it is determined that a reverse-running risk response is necessary.

  When the guide route does not include a reverse run risk route or does not include a required route (that is, when it is determined that no reverse run risk correspondence is required), the calculation unit 32 includes information on the guide route (route information). Is generated. Then, the route information is transmitted to the car navigation 14 (transmission source of navigation information) (S19), and the route search process is terminated. The computing unit 24 of the car navigation 14 performs route guidance based on the route information received from the server 16 (transmission destination of navigation information).

  On the other hand, when it is determined that there is a required route and it is necessary to handle the reverse running risk, the calculation unit 32 generates route information including the reverse running risk corresponding information for each required route and transmits the route information to the car navigation system 14. (S20), the route search process is terminated. The computing unit 24 of the car navigation 14 performs route guidance based on the route information received from the server 16, and performs reverse running risk handling processing based on the backward running risk handling information included in the route information.

  FIG. 3 is a flowchart showing an example of route search processing executed by the calculation unit 24 of the car navigation 12.

  The calculation unit 24 inputs navigation information via the input / output unit 23 (S31), and calculates a guidance route with reference to the map information DB 26 (S32). Then, it extracts the reverse risk point information along the guide route from the map information DB 26 (S33), and determines whether the reverse route is included in the guide route based on the reverse flag of the reverse risk point information ( S34).

  When it is determined that the reverse route is included in the guidance route, the calculation unit 24 acquires the reverse risk evaluation value Rr of the reverse risk route (S35), and calculates the driver risk evaluation value Rd (S36). . Then, the total risk evaluation value R (= Rr + Rd) of each reverse running risk route is calculated (S37), and the necessity of dealing with the reverse running risk is determined based on the total risk evaluation value R (S38). If there is a reverse risk route (required response route) with the overall risk evaluation value R equal to or greater than the threshold Rth, it is determined that reverse risk response is necessary.

  If the guidance route does not include a reverse running risk route or does not contain a required route (that is, if it is determined that no reverse running risk handling is necessary), the calculation unit 24 provides route guidance based on the calculated guidance route. Is executed (S39).

  On the other hand, when it is determined that there is a required route and it is necessary to cope with the reverse running risk, the calculation unit 24 performs route guidance based on the calculated guidance route, and reverses based on the reverse running risk correspondence information of each required route. A running risk handling process is executed (S40).

● Reverse-running risk handling processing The reverse-running risk handling information includes position information and a comprehensive risk evaluation value R for each of the required routes, and reverse running mode. After calculating (or receiving) the guidance route including the required route, the calculation unit 24 executes, for example, any one or combination of the following processing as the reverse running danger handling processing.

  ・ Process 1: The entire guidance route is presented and the risk of reverse running is reported. For example, the presence of a reverse running risk point on the guidance route, a specific position, a reverse running mode, and the like are displayed and / or voice-guided.

  ・ Processing 2: Notification in the vicinity of the reverse run risk point. For example, when the vehicle 12 approaches a reverse running risk point (enters a predetermined distance range centered on the reverse running risk point), the existence of a reverse running risk point, a specific position, a reverse running mode, etc. Display and / or voice guidance that you are driving around the driving risk point.

  ・ Process 3: Presentation of alternative routes. For example, the guidance route excluding the location, link, and node corresponding to the required route is recalculated (or recalculated by the server 16) and presented as an alternative route.

  ・ Process 4: The entire guidance route is presented and the reverse run frequent occurrence point is notified. For example, the presence, specific position, reverse running mode, and the like of many reverse running points on the guidance route are displayed and / or voice-guided.

  ・ Processing 5: Notification in the vicinity of frequent reverse run points. For example, when the vehicle 12 approaches a reverse run frequent spot (enters a predetermined distance range centered on the reverse run frequent spot), the presence of a reverse run frequent spot, a specific position, a reverse running mode, etc. Display and / or voice guidance that you are driving around a high-frequency location.

  Processes 4 and 5 are executed, for example, when the driver himself / herself has a low risk of reverse running but calls attention on a road where frequent reverse running occurs. The reverse run frequent occurrence point is a place where the reverse run risk evaluation value Rr where the reverse run has occurred several times in the past is the highest value.

  For example, the initial state of the car navigation system 14 is set to execute all the above processes. A user of the car navigation system 14 can set a process or a combination of processes to be executed as the reverse running danger handling process by operating the input / output unit 23.

Further, depending on the magnitude of the average value Rm of the overall risk evaluation values Rj of each of the required routes indicated by the reverse running risk correspondence information, the reverse running risk handling processing may be selected and combined as follows.
Rm = Σ _{j = 1} ^M Rj / M;
if (0.5 ≤ Rm)
Perform process 3;
if (0.3 ≤ Rm <0.5)
Execute process 1 and process 2;
if (Rm <0.3)
Execute process 4 and process 5;
Where M (≧ 1) is the number of routes that need to be handled,
The above numerical values for determination (0.3, 0.5) are examples.

Alternatively, the reverse risk handling process may be selected and combined as follows based on the total risk evaluation value Rj for each of the required routes indicated by the reverse risk correspondence information.
count_H = 0;
count_M = 0;
for (j = 1; M; 1) {
if (0.5 ≤ Rj)
count_H ++;
if (0.3 ≤ Rj <0.5)
cont_M ++;
}
if (count_H> 0)
Perform process 3;
elseif (count_M> 0)
Execute process 1 and process 2;
else
Execute process 4 and process 5;
However, the above numerical values for determination (0, 0.3, 0.5) are examples.

  In other words, if there is a required route with an overall risk assessment value Rj that is greater than or equal to a predetermined value (0.5 or more in the above example), or if the average value Rm is greater than or equal to a predetermined value (0.5 or more in the above example) 3 (Presentation of alternative route) is executed. However, if there is no alternative route and calculation of the alternative route is impossible, it is notified that the alternative route cannot be presented, and then the processing proceeds to processing 1 and processing 2.

  Alternatively, an alternative route can be calculated, but a link cost (load for traveling on the link) exceeding a predetermined value is generated (for example, the travel distance is predicted to be significantly delayed, and the travel distance is significantly increased). If so, notify that fact. In response to this notification, when the driver instructs that the alternative route is not used, the processing proceeds to processing 1 and processing 2.

● Driver risk assessment value Rd
The driver risk evaluation value Rd is an evaluation value for applying consideration of driver attributes and driving history to reverse running risk. In the following, we will explain an example in which consideration of driver attributes and driving history is applied in the direction of increasing the reverse running risk, but conversely, it is applied in the direction of positively evaluating the case where the conditions are not met and lowering the reverse running risk May be.

  In addition, regarding the identification of the driver, the user information input to the key, the unlocking terminal, and the car navigation 14 can be used. In addition, the driver may be identified based on information on a mobile phone or a smartphone, or the driver may be identified based on information in a customer information database held by a dealer or an automobile company. Alternatively, information obtained by virtually integrating information of all users of the vehicle 12 on which the car navigation system 14 is mounted without identifying individual drivers may be used as the driver attributes and the driving history.

Driver attribute Age coefficient k1: When age is low or high (assuming reverse running is likely to occur), the age coefficient k1 is increased.
Driving history coefficient k2: When the driving history is short (assuming reverse running is likely to occur), the driving history coefficient k2 is increased.
Living area coefficient k3: When traveling outside the living area where the vehicle is normally traveling (for example, in units of prefectures), the living area coefficient k3 is increased.

-Recent driving history (from boarding to getting off)
Fluctuation coefficient k4: Fluctuation coefficient when the degree of fluctuation and frequency of the running vehicle exceed the specified threshold based on the output of the on-vehicle sensor and the image recognition result of the on-vehicle camera (the driving skill is low / temporarily decreased (drowsiness, fatigue)) Increase k4.
Hazardous driving tendency coefficient k5: When there is a high unfavorable / inappropriate driving tendency based on the speed at intersections and curve driving, the degree of compliance with various traffic regulations, etc. (assuming there is a high probability of not driving with attention to reverse running) Increase the dangerous driving tendency coefficient k5.

・ Medium and long-term driving history (about the past few months)
Reverse running history coefficient k6: If reverse running has occurred in the past, the reverse running history coefficient k6 is increased.
Reverse run attempt coefficient k7: If there is a risk of reverse run in the past even if reverse run is not reached, the reverse run attempt coefficient k7 is increased.
Hazardous driving tendency coefficient k8: When an unfavorable / inappropriate driving tendency is high based on the speed at intersections and curve driving, the degree of compliance with various traffic regulations, etc. (assuming there is a high probability of not driving with attention to reverse running) Increase the dangerous driving tendency coefficient k8.

  Furthermore, the traveling time zone and the weather during traveling may be taken into consideration.

・ Environmental conditions (from boarding to getting off)
Time factor k9: In the case of nighttime (assuming that it is easy to overlook signs, signs, etc.), increase the time factor k9.
Weather coefficient k10: When rain, snow, or fog is detected from rain sensor, wiper or fog lamp operation, etc., when rain, snow, or fog occurs (assuming that visibility is likely to cause reverse running) Make it high.

  The coefficient ki (i = 0 to 10 in the above example) is set in a range of 0 ≦ ki ≦ 1, for example, based on the above condition. Further, the reverse running history coefficient k6 and the reverse running attempt coefficient k7 are increased in an accelerating manner according to the number of reverse runnings and the number of reverse running attempts (for example, 0 → 0.5 → 0.8 → 1). The above coefficients are merely examples, and it is not necessary to use all of them, and it is possible to further add coefficients corresponding to conditions that are likely to cause reverse running.

The calculation unit 24 sets a coefficient ki based on the identified driver of the vehicle 12, and calculates the driver risk evaluation value Rd by the following equation.
Rd = Σ _{i = 1} ^N ki / N… (1)
Here, N is the number of coefficients ki (N = 10 in the above example).

In addition, the following equation that gives weight to the reverse running history coefficient k6 and the reverse running attempt coefficient k7 may be used for calculating the driver risk evaluation value Rd, focusing on the reverse running history and the reverse running attempt.
Rd = (k1 + k2 + k3 + k4 + k5 + w6 ・ k6 + w7 ・ k7 +… + k _N ) / N… (2)
Where weight w6> 1,
Weight w7> 1.

  As described above, the vehicle navigation system 10 can be provided to prevent the reverse running of the vehicle in consideration of the reverse running risk point information, the driver attribute, the driving history, and the environmental conditions. That is, even when the driver of the vehicle 12 does not have a reverse running history, the reverse running risk is calculated in consideration of the road, the driver and the driving situation unfamiliar with the driver, the reverse running risk of other vehicles, and environmental conditions. And the necessity for the reverse running risk response | compatibility can be determined, and the reverse run risk response process for preventing the reverse running of the vehicle can be executed when necessary.

  According to the route guidance device of the present invention, the reverse running prevention function avoids beforehand traveling on a route with a high reverse running risk, or if it is difficult to avoid, sufficiently alerting the driver, This has the effect of preventing the vehicle from running backward.

  Suppress excessive and unnecessary notifications by taking into account driver attributes and driving history. In promoting guidance for alternative guidance routes, the driver's age and driving history (driving experience and driving frequency at the driving location), recent driving history (presence of wobble, risky driving tendency), medium to long-term driving history Based on the judgment material (whether reverse running or reverse running has been attempted), it realizes a function for preventing reverse running with high accuracy and reduced inconvenience.

  Specifically, what kind of reverse running risk (reverse running mode, etc.) exists at which point can be alerted in advance to the driver so that no reverse running occurs at that point.

  By calculating an alternative guide route and newly presenting it, the risk of reverse running can be reduced.

  If the alternative guide route cannot be calculated, or if the link cost is high even if it can be calculated, the alternative guide route is not presented and the risk of reverse running is kept informed and the driver is overloaded. Not strong.

  In many cases, the reverse running history of other vehicles is more information that contributes to prevention of reverse running than the reverse running history of the own vehicle. By utilizing the reverse running history of other vehicles, reverse running risk point information (reverse running risk judgment target points) is increased, leading to a reduction in the number of reverse running occurrences.

  Even if the driving history is such that a driver with high driving skill or a driver who is relatively difficult to cause reverse driving, there is a risk of being involved in reverse driving of another vehicle. Regardless of the driver attribute and driving history, there is an effect of notifying the frequent occurrence point of reverse running of other vehicles and reducing the risk of accidents caused by reverse running of other vehicles.

Claims (16)

A map database and a holding unit for holding reverse running risk point information indicating reverse running risk at a specific point;
A calculation unit for calculating a guide route from the map database based on navigation information;
A determination unit that refers to the reverse running risk point information and determines whether or not a point having a reverse running risk is included in the guidance route;
A determination unit that determines whether it is necessary to handle reverse running risk based on the result of the determination;
A route guidance device comprising: a generation unit that generates reverse running risk correspondence information based on the result of the determination.   When it is determined that the point having the reverse running risk is included in the guidance route, the determination unit acquires the reverse running risk evaluation value of the point from the reverse running risk point information, and the reverse running risk evaluation value 2. The route guidance device according to claim 1, wherein the determination is performed based on the information.   The determination unit acquires a driver risk evaluation value based on at least one of driver attribute information and driving history of a vehicle traveling on the guidance route, and determines the driver risk evaluation value and the reverse running risk evaluation value. 3. The route guidance device according to claim 2, wherein the determination is made based on a sum.   4. The reverse running risk correspondence information includes any one of the position information of the point having the reverse running risk, and the sum of the driver risk evaluation value and the reverse running risk evaluation value of the point. A route guidance device according to claim 1.   5. The route according to claim 4, further comprising a processing unit that presents route information indicating the guidance route based on the reverse-running risk correspondence information and presents reverse-running risk based on the reverse-running risk correspondence information. Guidance device.   The said processing part makes the said calculation part calculate an alternative guide route, when the said guide route contains the point where the value of the said sum included in the said reverse running risk correspondence information is a predetermined value or more. 5. A route guidance device according to 5.   When the calculation of the alternative guide route is impossible, or when a link cost higher than a predetermined value is generated by the alternative guide route, the processing unit notifies the fact, and then presents the route information. 7. The route guidance device according to claim 6, including presenting point information having the reverse running risk.   6. The route guidance device according to claim 5, wherein the processing unit includes presentation of the point information having the reverse running risk in the presentation of the route information.   9. The route guidance device according to claim 1, wherein the holding unit acquires the reverse running risk point information from an external storage device by communication.   10. The vehicle according to any one of claims 1 to 9, further comprising update means for acquiring reverse running information of the vehicle by communication and updating the reverse running risk point information based on the acquired reverse running information. Route guidance device.   5. The communication device according to any one of claims 1 to 4, further comprising a communication unit that receives the navigation information and transmits route information indicating the guidance route and the reverse running risk correspondence information to a transmission source of the navigation information. The described route guidance device. A communication unit that transmits navigation information and receives route information indicating a guide route and reverse running risk correspondence information from a destination of the navigation information;
A route guidance device including a processing unit that presents route information indicating the guidance route based on the reverse running risk correspondence information and presents reverse running risk based on the reverse running risk correspondence information.   13. The route guidance device according to claim 12, further comprising an input / output unit for inputting the navigation information and displaying the route information. A control method for a route guidance device having a map database and a holding unit that holds reverse running risk point information indicating reverse running risk at a specific point;
The calculation unit calculates a guide route from the map database based on the navigation information,
The determination unit refers to the reverse running risk point information, determines whether or not a point having a reverse running risk is included in the guidance route,
The determination unit determines whether it is necessary to handle reverse running risk based on the result of the determination,
A control method in which the generation unit generates reverse running risk correspondence information based on the determination result. A method for controlling a route guidance device,
The communication unit transmits navigation information, receives route information indicating a guidance route and reverse running risk correspondence information from the transmission destination of the navigation information,
A control method in which the processing unit presents route information indicating the guidance route based on the reverse running risk correspondence information and presents a reverse running risk based on the reverse running risk correspondence information.   14. A program for causing a computer to function as each means of the route guidance device according to claim 1.

Images