JP2012047643A - Backward traveling notification device, backward traveling notification method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To notify that there is the possibility of backward traveling before the backward traveling.SOLUTION: A control part 109 acquires a road type and link type corresponding to a location to be specified based on the location information of a self-device acquired from a GPS receiver 101 from a map DB108a. When the road type and link type corresponding to the location of the self-device is changed to prescribed combination, the control part 109 stores the location information of the self-device in a location information storage part 108b. When separating from the location shown by the location information stored in the location information storage part 108b by a first distance or more, and then moving to a range within a second distance which is smaller than or equal to the first distance, the control part 109 notifies that there is the possibility of backward traveling by a display part 106 and a voice output part 107.

Description

  The present invention relates to a reverse running notification device, a reverse running notification method, and a program.

  Accidents of reverse running on the same exit road often occur after stopping at the SA (service area), PA (parking area), etc. via the taxiway (exit road) from the expressway. It is considered that one of the causes is that there is no sense of direction by traveling while searching for a parking place in SA and PA, and the exit route is mistaken as an approach route to the main line.

  In order to prevent such an accident, a technique for detecting and notifying reverse running of a vehicle has been proposed (see, for example, Patent Document 1).

JP 2009-168548 A

The technique disclosed in Patent Document 1 is a technique for detecting reverse running of an automobile and notifying a user that the vehicle is running backward, and reverse running has occurred at the time of notification.
For this reason, it is desired to notify that there is a possibility of reverse running before reverse running occurs.

  This invention is made | formed in view of the said situation, and it aims at alert | reporting that there exists a possibility of reverse running before reverse running.

In order to achieve the above object, the reverse running notification device according to the first aspect of the present invention includes:
A one-way exit determination unit that determines whether the device has moved from a one-way road to a road other than one-way;
A position information storage unit that stores position information indicating the position of the own device in the storage unit when the one-way / exit determination unit determines that the own device has moved from a one-way road to a road other than one-way; and
It is determined whether or not the device has moved to a range within a second distance that is smaller than or equal to the first distance after being separated from the position indicated by the position information stored in the storage unit by a first distance or more. A position determination unit for
If it is determined by the position determination unit that the device has moved away from the position indicated by the position information stored in the storage unit by the first distance or more and then moved to a range within the second distance, there is a risk of reverse running A notification unit for notifying that there is,
It is characterized by that.

For example, the reverse running notification device is
A current position determining unit for determining the current position of the own device;
The one-way exit determination unit
A road information storage unit for storing road information and road attribute information;
An exit determining unit that identifies a road from the current position determined by the current position determining unit and determines that the one-way exit has been made based on attribute information of the road;

For example, the position determination unit is located within a predetermined distance from the position indicated by the position information stored in the storage unit, and the position indicated by the position information stored in the storage unit and the position of the own device. To determine if the distance between and has decreased over time,
The notification unit is within a predetermined distance from the position indicated by the position information stored in the storage unit by the position determination unit, and the position information stored in the storage unit is stored in the storage unit. When it is determined that the distance from the indicated position has decreased with the passage of time, a notification is made that there is a risk of reverse running.

  For example, the notification unit increases the alarm level as the distance between the position indicated by the position information stored in the storage unit and the current position of the apparatus decreases.

For example, the reverse running notification device is
A one-way entry determination unit that determines whether the device has moved from a road other than one-way to a one-way road;
And a position information deletion unit that deletes the position information stored in the storage unit when the one-way entry determination unit determines that the device has moved from a road other than one-way to a one-way road. .

For example, the reverse running notification device is
A distance determination unit that determines whether or not the device itself is a predetermined distance away from the position indicated by the position information stored in the storage unit;
A position information deletion unit that deletes the position information stored in the storage unit when the distance determination unit determines that the device is separated from the position indicated by the position information stored in the storage unit by a predetermined distance; Is further provided.

For example, the reverse running notification device is
A period elapsed determination unit that determines whether or not a predetermined period has elapsed since the position information storage unit stored the position information in the storage unit;
A position information deletion unit that deletes the position information stored in the storage unit when it is determined by the period elapsed determination unit that the predetermined period has elapsed since the position information storage unit stored the position information in the storage unit. And further comprising.

  For example, the notification unit notifies that there is a possibility of reverse running using at least one of voice and screen.

In order to achieve the above object, the reverse running notification method according to the second aspect of the present invention includes:
A one-way exit determination step for determining whether the device has moved from a one-way road to a road other than one-way; and
When it is determined that the own device has moved from a one-way road to a road other than one-way, a position information storage step for storing position information indicating the position of the own device in the storage unit;
It is determined whether or not the device has moved to a range within a second distance that is smaller than or equal to the first distance after being separated from the position indicated by the position information stored in the storage unit by a first distance or more. A position determination step to be performed;
When it is determined that the device has moved to a range within the second distance after the first distance from the position indicated by the position information stored in the storage unit, a notification that there is a risk of reverse running An informing step,
It is characterized by that.

In order to achieve the above object, a program according to the third aspect of the present invention provides:
On the computer,
A one-way exit determination procedure for determining whether the device has moved from a one-way road to a road other than one-way;
When it is determined that the own device has moved from a one-way road to a road other than one-way, a position information storage procedure for storing position information indicating the position of the own device in the storage unit;
It is determined whether or not the device has moved to a range within a second distance that is smaller than or equal to the first distance after being separated from the position indicated by the position information stored in the storage unit by a first distance or more. Position determination procedure to be performed,
When it is determined that the device has moved to a range within the second distance after the first distance from the position indicated by the position information stored in the storage unit, a notification that there is a risk of reverse running A notification procedure to be executed,
It is characterized by that.

  According to the present invention, it is possible to notify that there is a possibility of reverse running before reverse running.

It is a block diagram which shows the structure of the navigation apparatus which concerns on embodiment of this invention. It is a figure for demonstrating a road classification code. It is a figure for demonstrating a link classification code. It is a figure for demonstrating the road classification and link classification in a taxiway. (A) And (b) is a figure for demonstrating the distance L1 and the distance L2. It is a flowchart for demonstrating the memory | storage process of the positional information which a navigation apparatus performs. It is a flowchart for demonstrating the reverse running notification process which a navigation apparatus performs. It is a flowchart for demonstrating the deletion process of the positional information which a navigation apparatus performs. It is a figure for demonstrating the relationship between a road classification change point and the position of the own vehicle. It is a figure for demonstrating an example of the screen which alert | reports that there exists a possibility of reverse running. It is a figure for demonstrating an example of the locus | trajectory of a vehicle. It is a figure for demonstrating a boundary line. 10 is a flowchart for explaining reverse running notification processing executed by the navigation device according to the second embodiment. It is a figure for demonstrating an example of the locus | trajectory which a vehicle moves to a general road via an exit path.

(Embodiment 1)
A navigation device 10 including a reverse running notification device according to an embodiment of the present invention will be described below with reference to the drawings.

The navigation device 10 is a device that displays the position of the own device (= the position of an automobile (hereinafter referred to as the own vehicle) on which the navigation device is mounted).
As shown in FIG. 1, the navigation device 10 includes a GPS (Global Positioning System) receiver 101, a gyro sensor 102, a vehicle speed sensor 103, a VICS (Vehicle Information and Communication System) receiver 104, an operation unit 105, A display unit 106, an audio output unit 107, a storage unit 108, and a control unit 109 are provided.

  The GPS receiver 101 calculates position from each GPS satellite based on radio waves from at least three GPS satellites received by the GPS antenna, thereby generating position information indicating the position of the own vehicle. Then, the GPS receiver 101 supplies the generated position information to the control unit 109.

  The gyro sensor 102 is composed of a vibration type gyro or the like. The gyro sensor 102 detects the direction of the host vehicle and supplies direction information indicating the detected direction of the host vehicle to the control unit 109.

  The vehicle speed sensor 103 calculates a vehicle speed based on a vehicle speed pulse supplied from an ECU (Electronic Control Unit) of the host vehicle, and supplies vehicle speed information indicating the calculated vehicle speed to the control unit 109.

  The VICS receiver 104 supplies traffic information included in radio waves received by an FM (Frequency Modulation) antenna or the like to the control unit 109. Here, the traffic jam information is information that identifies in which road section the traffic jam has occurred.

  The operation unit 105 includes a touch panel, cursor keys, and the like, and supplies a signal corresponding to an operation instruction from the user to the control unit 109.

  The display unit 106 includes a liquid crystal display device or the like, and displays an image under the control of the control unit 109.

  The audio output unit 107 includes a D / A (digital / analog) converter, an amplifier, a speaker, and the like, converts the digital signal supplied from the control unit 109 into an analog signal, amplifies it, and outputs it as audio from the speaker. .

  The storage unit 108 includes a magnetic disk or the like, and includes a map DB (database) 108a, a position information storage unit 108b, a road type storage unit 108c, a parameter storage unit 108d, and the like.

  The map DB 108a stores map image information (image information) and attribute information indicating road attributes on the map. In this embodiment, as attribute information, node information related to connection nodes such as intersections and branch points, link information related to links (roads) connecting the nodes, and the like are stored.

  The node information includes information such as node identification information for identifying the node, node position information, link number information indicating the number of connected links, and a name indicating the node name. The link information includes node identification information of a node that is a starting point of the link, node identification information of a node that is an end point of the link, a road type code of a road corresponding to the link, a link type code, and the like.

As shown in FIG. 2, the road type code includes code information for specifying the type of road such as an urban highway, a high-speed automobile national road, a general national road, and a general road.
including.

  The link type code is identification information for specifying the type of link. As shown in FIG. 3, the main line (up / down line non-separation) link, main line (up / down line separation) link, connection path (transition between main lines) Line) link, intra-intersection link, connecting road (ramp) link, roadway link on the same route as the main line, SA indicating the link between the main line of the expressway and SA (service area) or PA (parking area), etc. Includes a code indicating a side line link or the like.

  The road type code and the link type code will be described with reference to specific examples. FIG. 4 shows the main roads R1 and R2 and the service area R3 of the expressway, an exit road R4 that continues from the main line R1 to the service area R3, and an approach path R5 that continues from the service area R3 to the main line R1.

  In FIG. 4, “intercity highway” or “urban highway” is set as the road type for the main lines R1 and R2 of the expressway, and “main line” is set as the link type, and the road type is set as the road type in the service area SA. “Other guide roads” and “SA equilateral link” are set as the link type.

  In addition, regarding the exit route R4 following the service area R3 from the main line R1, on the expressway side with the border line R41 virtually set at almost the center of the exit route R4, the road type is “intercity highway ”Or“ Urban Expressway ”is set,“ SA equilateral line link ”is set as the link type,“ Other guide road ”is set as the road type on the service area R3 side with the boundary line R41 as the link, and the link “SA equilateral line link” is set as the type.

  In addition, regarding the approach road R5 that leads from the service area R3 to the main road R1 of the expressway, as a road type on the expressway side with the border line R51 virtually set at the substantially central portion of the approach road R5 as a boundary. “Intercity highway” or “city highway” is set, “SA equilateral link” is set as the link type, and “Other guide road” is set as the road type on the service area R3 side with the boundary line R41 as the boundary. It is set, and “SA equilateral line link” is set as the link type.

  Therefore, the road type corresponding to the current position of the host vehicle is, for example, a combination of “intercity highway” or “city highway” and the link type “SA equal side link”, and the road type is “other guideway” and When the link type changes to a combination of “SA equal side links”, it is considered that the road has moved from a one-way road (highway to which reverse running is not permitted) to a road other than one-way (service area R3 in FIG. 4). be able to. On the other hand, the road type corresponding to the current position of the vehicle is “Other guide road (general road)” and the link type is “SA equal side link”, and the road type is “intercity highway” or “city highway”. When the link type changes to a combination of “SA equal side links”, it can be considered that the road has moved from a road other than one-way (ie, SA) to a one-way road (highway that does not allow reverse running). .

The location information storage unit 108b of the storage unit 108 shown in FIG. 1 stores the current location information of the host vehicle.
The road type storage unit 108c stores a road type and a link type corresponding to the current position of the vehicle.

  The parameter storage unit 108d of the storage unit 108 stores various operation parameters. In the present embodiment, distance parameters (threshold values) L1 and L2 are stored particularly for each exit route from the main road of the expressway to the service area (SA) or the parking area (PA). The threshold L2 is a distance from the boundary line set for each exit road to the service area (SA) or the parking area (PA) + a first predetermined amount (for example, 20 m), and the threshold L1 is a distance L2 + second. Is set to about a predetermined amount (for example, 20 m). As shown in FIG. 5A, the threshold values L1 and L2 are stored in advance in the parameter storage unit 108d in association with the position of the boundary line (latitude X, longitude Y) for each exit path.

  Specifically, referring to the example of FIG. 4, as shown in FIG. 5B, distances L1 and L2 are set based on the position of the boundary line R41 of the exit path R4. The threshold value L2 is substantially equal to the distance +20 m from the boundary line R41 to the service area R3, and the threshold value L1 is set to about the threshold value L2 + a predetermined amount (for example, 20 m). By setting the threshold values L1 and L2 in this way, when the distance between the vehicle and the boundary line R41 becomes larger than the threshold value L2, the vehicle has entered the service area R3, and the distance between the vehicle and the boundary line R41 is When the threshold value L1 is exceeded, it is possible to determine that the vehicle has traveled in the service area R3 and has left the exit route R4 to some extent.

  The control unit 109 is composed of a one-chip processor with a built-in memory or the like, and controls each unit of the navigation device 10 according to a program stored in the built-in memory. The control unit 109 also functions as a timer 109a. Then, the control unit 109 acquires the road type and the link type corresponding to the position specified from the position information supplied from the GPS receiver 101 from the map DB 108a, and the current position of the own vehicle, the road type and the link of the road Based on the distance from the point where the combination of the types has changed, the fact that there is a possibility of reverse running is notified.

Next, operation | movement of the navigation apparatus 10 of this embodiment is demonstrated.
The navigation device 10 is similar to a general navigation device, the position information of the own vehicle acquired from the GPS receiver 101, the direction information of the own vehicle acquired from the gyro sensor 102, and the vehicle speed information of the own vehicle acquired from the vehicle speed sensor 103. Based on the map image information acquired from the map DB 108a, a map indicating the position of the vehicle is displayed on the display unit 106. The user drives the vehicle while referring to the map displayed on the display unit 106.

The navigation device 10 performs reverse running notification (warning) processing unique to the present embodiment in parallel with the general navigation operation described above.
Hereinafter, in order to facilitate understanding, the navigation apparatus will be described by taking as an example the case where the vehicle enters the service area R3 from the main road R1 of the expressway R1 shown in FIG. 4 and then returns to the main line R1. The reverse running notification process executed by 10 will be described.

(1) Position Information Storage Process After the power is turned on, the control unit 109 starts the position information storage process shown in FIG. 6, and first resets the counter value t1 of the timer 109a to 0 to start timing ( Step S1). The control unit 109 determines whether or not the counter value t1 of the timer 109a is equal to or longer than a predetermined time T1 (step S2). The time T1 corresponds to a period in which the control unit 109 acquires the position information of the own vehicle from the GPS receiver 101.

When it is determined that the counter value t1 is less than the predetermined time T1 (step S2; No), the control unit 109 repeats step S2.
On the other hand, when it is determined that the counter value t1 is equal to or greater than the predetermined time T1 (step S2; Yes), the control unit 109 acquires the position information of the own vehicle from the GPS receiver 101 (step S3). The control unit 109 reads the road type and the link type corresponding to the position specified by the acquired position information of the own vehicle from the map DB 108a (step S4).
Since the control unit 109 compares the road type and link type before one cycle T1 with the current road type and link type, whether or not the road type and link type before one cycle T1 are stored in the road type storage unit 108c. Is determined (step S5).

  When it is determined that the road type and the link type before one cycle T1 are not stored in the road type storage unit 108c (step S5; No), the control unit 109 proceeds to step S9 and reads the road read in step S4 The type and link type are stored in the road type storage unit 108c (step S9).

  On the other hand, if the control unit 109 determines that the road type and the link type before one cycle T1 are stored in the road type storage unit 108c (step S5; Yes), the control unit 109 is not one-way from a one-way road. As the one-way exit determination unit for determining whether or not the vehicle has moved to the road, the road type and link type before one cycle T1 stored in the road type storage unit 108c, and the road type and link type read in step S4 From the combination of the road type “intercity highway” or “city highway” and the link type “SA equal side link”, the road type “other guideway (general road)” and the link type “SA” It is determined whether or not the combination has changed to the “isoline link” combination (step S6). That is, the control unit 109 determines whether or not the host vehicle is considered to have moved from the one-way road (highway road) to a road (SA) other than one-way through the exit path.

  The control unit 109 determines that there is no change in the combination of the road type and the link type, or the road type is set to “Others” from the combination of the road type “intercity highway” or “city highway” and the link type “SA equilateral link”. When it is determined that the combination has changed to a combination other than the “guide road” and the link type “SA equilateral link”, that is, the vehicle is moving from a one-way road (highway) to a road (SA) other than one-way. If it is determined that it has not been moved (step S6; No), the process returns to step S1.

On the other hand, the control unit 109 determines that the road type is “Other guide roads” and the link type is “SA equal side line” from the combination of “intercity high speed” or “city high speed” and the link type “SA equal side link”. When it is determined that the link has changed to a combination of links, that is, when it is determined that the vehicle has moved from a one-way road (highway expressway) to a road other than one-way (service area SA) (step S6). Yes), as the position information storage unit that stores the position information indicating the position of the own device in the storage unit, the position information of the own vehicle acquired in step S3 (hereinafter referred to as the position information of the road type change point) is the position information. It memorize | stores in the memory | storage part 108b (step S7).
Further, the control unit 109 reads the distances L1 and L2 associated with the position acquired in step S3 from the parameter storage unit 108d (step S8). This position corresponds to the position of the boundary line R41 shown in FIG.

  Further, the control unit 109 stores the road type and the link type read out in step S4 in the road type storage unit 108c (step S9).

Thereafter, the control returns to step S1, and the control unit 109 repeats the same processing.
Thereby, when the own vehicle moves from a one-way road (for example, an expressway) to a road other than one-way (for example, SA, PA, or general road), the position information of the road type change point is stored in the position information storage unit. The road type and the link type are stored in the road type storage unit 108c.

(2) Reverse running notification process The control unit 109 performs reverse running shown in FIG. 7 in response to storing the location information of the road type change point in the location information storage unit 108b in the location information storage processing shown in FIG. The notification process is started, and first, the counter value t2 of the timer 109a is reset to 0 to start timing (step S11). The control unit 109 determines whether or not the counter value t2 of the timer 109a is equal to or longer than a predetermined time T2 (step S12). The time T2 corresponds to a cycle in which the control unit 109 acquires the position information of the own vehicle from the GPS receiver 101.

When it is determined that the counter value t2 is less than the predetermined time T2 (step S12; No), the control unit 109 repeats step S12.
On the other hand, when it is determined that the counter value t2 is equal to or greater than the predetermined time T2 (step S12; Yes), the control unit 109 acquires the position information of the own vehicle from the GPS receiver 101 (step S13). The control unit 109 calculates the distance between the position specified by the acquired position information of the own vehicle and the position specified by the position information of the road type change point stored in the position information storage unit 108b (step S14). . The control unit 109 determines whether or not the calculated distance is greater than or equal to the predetermined threshold L1 read in step S8 (step S15).

When it is determined that the calculated distance is less than the predetermined threshold L1 (step S15; No), the control unit 109 advances the process to step S17 described later.
On the other hand, when determining that the calculated distance is equal to or greater than the predetermined threshold L1 (step S15; Yes), the control unit 109 sets the value of ThroughFlg (pass flag) to 1 (step S16).
Here, ThroughFlg (passage flag) = 1 indicates that the road type change point has been separated by a predetermined threshold L1 or more, and ThroughFlg (passage flag) = 0 is greater than or equal to the predetermined threshold L1 from the road type change point. Indicates that he has never left.

  Subsequently, the control unit 109 functions as a ThroughFlg (ThroughFlg () as a position determination unit that determines whether or not the position information is moved to a range within the second distance after being separated from the position indicated by the stored position information by the first distance or more. It is determined whether or not the passing flag) = 1 and the distance calculated in step S14 is equal to or smaller than the threshold L2 (step S17). That is, as shown in FIG. 9, it is determined whether or not the vehicle is in a circle having a radius L2 centered on a road type change point (boundary line) R41.

When the control unit 109 determines that ThroughFlg (pass flag) = 1 and the distance calculated in step S14 is equal to or smaller than the predetermined threshold L2 (step S17; Yes), there is a possibility of reverse running. As shown in FIG. 10, the notifying unit for notifying the user is displayed on the display unit 106 with a map image and a message indicating that there is a possibility of reverse running in the vicinity of the exit of the exit path, and the voice output unit 107 informs the user of the fact. By outputting by voice, notification is made (step S18). Thereafter, the process proceeds to step S19.
On the other hand, when the control unit 109 determines that the condition that ThroughFlg (pass flag) = 1 and the distance calculated in step S14 is not more than the predetermined distance L2 is not satisfied (step S17; No). Then, step S18 is skipped and the process proceeds to step S19.

  In step S <b> 19, the control unit 109 determines whether or not a notification indicating that the reverse running notification process is to be ended (hereinafter referred to as an end notification) has been received. When it is determined that the end notification has been received (step S19; Yes), the control unit 109 ends the reverse running notification process. On the other hand, if the control unit 109 determines that the end notification has not been received (step S19; No), the control unit 109 returns the process to step S11 and repeats the same process.

  As a result, when the vehicle once leaves the road type change point once more than the threshold L1 and then returns to the range below the threshold L2, the control unit 109 is located near the exit of the exit route by voice or display. Notify that there is a risk of reverse running. For this reason, it is possible to alert the user by notifying that there is a risk of reverse running before going backward on the exit road of the expressway once exited.

(3) Position Information Deletion Process The control unit 109 uses the position information shown in FIG. 8 as a trigger when the position information storage unit 108b stores the position information of the road type change point in the position information storage process shown in FIG. The information deletion process is started, and first, the counter value t3 of the timer 109a is reset to 0 to start timing (step S31). The control unit 109 determines whether or not the counter value t3 of the timer 109a is equal to or longer than a predetermined time T3 (step S32). This time (T3) corresponds to a period in which the control unit 109 acquires the position information of the own vehicle from the GPS receiver 101.

When it is determined that the counter value t3 is less than the predetermined time T3 (step S32; No), the control unit 109 repeats step S32.
On the other hand, when it is determined that the counter value t3 is equal to or greater than the predetermined time T3 (step S32; Yes), the control unit 109 acquires the position information of the own vehicle from the GPS receiver 101 (step S33). The control unit 109 reads the road type and the link type corresponding to the position specified by the acquired position information of the own vehicle from the map DB 108a (step S34). The control unit 109 determines whether the own device has moved from a road other than one-way to a one-way road as a one-way entry determination unit, and stores the road type and link type stored in the road type storage unit 108c. The road type and the link type read in step S34 are compared, and the road type is “intercity highway” or “city highway” from the combination of “other guideway” and link type “SA equal side link”. It is determined whether or not the link type has been changed to a combination of “SA equilateral line link” (step S35). That is, the control unit 109 determines whether or not the vehicle is considered to have moved from a road (SA) other than one-way to a one-way road (highway road).

If the control unit 109 determines that the vehicle has not moved from a road other than one-way (SA) to a one-way road (highway expressway) (step S35; No), the process returns to step S31.
On the other hand, if the control unit 109 determines that the vehicle has moved from a road other than one-way (SA) to a one-way road (highway expressway) (step S35; Yes), the reverse running notification process is performed. The process is notified that the process is to be ended (end notification) (step S36). The control unit 109 sets the value of ThroughFlg (passage flag) to 0 indicating that the road type change point has not been separated by a predetermined distance L2 or more (step S37). Moreover, the control part 109 deletes the positional information on a road classification change point from the positional information storage part 108b as a positional information deletion part (step S38).
This initializes the passage flag and position information storage unit 108b used in the next reverse running notification process.

The above operation will be specifically described with reference to FIGS.
For example, it is assumed that the vehicle has moved as indicated by a trajectory Q1 in FIG. In this case, first, the control unit 109 detects a change from a one-way road (highway) to a road (SA) other than one-way when the vehicle crosses the boundary line R41 of the exit route R4 ( Step S6). When the vehicle leaves the exit road and travels a fixed distance, distance ≧ threshold L1 and ThroughFlg = 1 (step S16). However, no warning is given at this stage. After that, when entering the region of distance ≦ threshold L2, Yes in step 17 and an alarm is issued (step S18). As a result, the driver notices that there is a risk of reverse running and avoids reverse running.

  On the other hand, it is assumed that the vehicle has moved as indicated by a locus Q2 in FIG. In this case, when the vehicle leaves the exit road and travels a certain distance, distance ≧ threshold L1 and ThroughFlg = 1 (step S16). Thereafter, when the vehicle passes the boundary line R51 while traveling on the approach road R5, the control unit 109 detects a change from a non-one-way road (SA) to a one-way road (highway road). (Step 35). And the control part 109 resets the positional information of ThroughFlg and a road classification change point (step S37, S38), and prepares for the next process.

  As described above, according to the present embodiment, when the vehicle has once departed from the road type change point by a predetermined threshold value L1 or more and then enters the range of the threshold value L2 or less, the control unit 109 performs voice or screen display. To notify that the vehicle is located near the exit of the exit path and may run backward. For this reason, it is possible to alert the user by notifying that there is a risk of reverse running before going backward on the exit road of the expressway once exited.

(Modification)
In the above embodiment, even after the vehicle enters the service area from the exit road, an alarm is issued when the vehicle enters the range below the threshold L2 after once leaving the road type change point by the threshold L1 or more. The present invention is not limited to this, and an alarm may be issued whenever the vehicle is within a range of threshold values L2 to L1 from the road type change point.

In this case, for example, when the calculated distance becomes larger than the threshold value L2 in step S15 of the reverse running notification process in FIG. 7, it is only necessary to configure ThroughFlg in step S16.
Further, without using ThroughFlg, an alarm may be issued when L1> calculated distance> L2.
An alarm stage may also be provided. For example, in Step S17 of FIG. 7, when it is determined that ThroughFlg = 1 and L2 <calculated distance ≦ L1, a relatively gentle warning is given. In Step S17, ThroughFlg = 1, calculated distance ≦ L2 When it is determined, a grave warning may be given. That is, the alarm level may be increased stepwise or continuously as the calculated distance decreases.
Moreover, it is good also as L2 = L1. In this case, an alarm is issued when the vehicle is once away from the exit path by a certain distance L2 or more and again enters within L2.
The setting method of L1 and L2 is arbitrary. For example, L2 may be a distance between the boundary line and the entrance of the service area or parking area.

  Moreover, the method of detecting that the vehicle has moved from the one-way road to other areas is arbitrary. In the above embodiment, “road type” and “link type” are used as road attribute information to detect movement from a one-way road to other areas, but the present invention is not limited to this. For example, if a one-way road is assigned a one-way code and another area is assigned another code, the current position code changes from one-way code to another code. It may be determined that the vehicle has moved from other roads to other areas.

It is also possible to detect movement from a one-way road to another area based on only the road type without using the link type. For example, when the road type changes from “urban highway” or “intercity highway” to “other guide roads”, it may be determined that the road has moved from one-way road to another area.
In addition, although the general code system for attribute information attached to roads is exemplified, the type of information and the assignment method are arbitrary as long as the attribute information can detect movement from a one-way road to other areas. is there. For example, as shown in FIG. 12, boundary lines R41 and R51 are set at the boundary between the exit route R4 or the approach route R5 and the service area SA, respectively, and one-way is shown in the entire range of the exit route R4 and the approach route R5. The code “01” may be set, and the code “02” indicating other than one-way traffic may be set in the entire range of the service area R3.

(Embodiment 2)
In the first embodiment, a warning is issued when the vehicle is at a position within the distance L2 from the road type change point. However, even when in this range, there is no risk of reverse running if the vehicle is moving away from the change point. Therefore, only when it is determined that the own vehicle is located within a predetermined distance range from the road type change point and the vehicle is approaching the road type change point, the navigation device 10 that notifies that there is a risk of reverse running. An embodiment will be described. The configuration of the navigation device 10 according to the present embodiment is the same as that of the first embodiment.

  In this case, as shown in FIG. 13, the control unit 109 executes the same process (hereinafter referred to as a distance calculation process) from the steps S11 to S14 of the reverse running notification process shown in FIG. 7 (step S41). . The control unit 109 determines whether or not the calculated distance is equal to or less than a predetermined distance L2 (step S42).

  When it is determined that the calculated distance is not equal to or less than the predetermined distance L2 (step S42; No), the control unit 109 advances the process to step 46.

  On the other hand, if the control unit 109 determines that the calculated distance is equal to or smaller than the predetermined distance L2 (step S42; Yes), is the distance calculated before one cycle T2 stored in the position information storage unit 108b? It is determined whether or not (step S43). Here, the control unit 109 repeatedly executes the processing from step S41 to step S47 at a predetermined cycle T2, but when executing step S43 for the first time, the position information storage unit 108b is calculated one cycle before T2. The distance is not memorized. On the other hand, when the number of times that step 43 is executed is the second time or later, the position information storage unit 108b stores the distance calculated one cycle T2.

  When it is determined that the distance calculated before one cycle T2 is not stored in the position information storage unit 108b (step S43; No), the control unit 109 advances the process to step S46.

  On the other hand, when the control unit 109 determines that the distance calculated before one cycle T2 is stored in the position information storage unit 108b (step S43; Yes), the control unit 109 performs step 41 based on the current position of the host vehicle. It is determined whether or not the calculated distance is equal to or less than the distance calculated in step S41 before one cycle T2 stored in the position information storage unit 108b (step S44). That is, the control unit 109 determines whether or not the own vehicle is approaching the road type change point.

  If the control unit 109 determines that the calculated distance is greater than the distance stored in the position information storage unit 108b (step S44; No), that is, if the vehicle is moving away from the road type change point, step S46. Proceed with the process.

  On the other hand, when the control unit 109 determines that the calculated distance is equal to or less than the distance stored in the position information storage unit 108b (step S44; Yes), that is, when the own vehicle is approaching the road type change point. The fact that there is a risk of reverse running is displayed on the display unit 106, and the fact is output by voice from the voice output unit 107, thereby informing (step S45).

The control unit 109 stores the distance calculated in step S41 in the position information storage unit 108b (step S46). The control unit 109 determines whether or not a notification indicating that the reverse running notification process is to be ended (hereinafter referred to as an end notification) has been received (step S47).
When it is determined that the end notification has been received (step S47; Yes), the control unit 109 ends the reverse running notification process. On the other hand, if the control unit 109 determines that the end notification has not been received (step S47; No), the control unit 109 returns the process to step S41 and repeats the same process.

The above operation will be specifically described with reference to FIG. 9, FIG. 11, and FIG.
For example, it is assumed that the vehicle has moved as indicated by a trajectory Q1 in FIG. In this case, first, if the vehicle passes through the road type change point and travels within the range of distance ≦ L2, Yes in step S42, but because it is far away from the road type change point, No in step 44 and warning Is not emitted. However, after that, when entering the region of distance ≦ L2 again, it becomes Yes in step S42 and approaches the road type change point, so that it becomes Yes in step 44 and a warning is issued.

  On the other hand, it is assumed that the vehicle has moved as indicated by a locus Q2 in FIG. In this case, when the vehicle passes through the road type change point and travels within the range of distance ≦ L2, Yes in step S42, but because it is far from the road type change point, No in step 44 and a warning is issued. I can't. Thereafter, the distance> L2, and No in step S42, and no warning is issued.

  Thereby, when the own vehicle moves to a range within a predetermined distance L2 from the road type change point, and the distance between the position of the own vehicle and the road type change point becomes smaller with time, that is, When the own vehicle is approaching the vicinity of the exit road of the expressway, the control unit 109 notifies that there is a possibility of reverse running by voice or a screen. For this reason, it is possible to alert the user by notifying that there is a risk of reverse running before going backward on the exit road of the expressway once exited.

  As described above, according to the present embodiment, when the own vehicle is approaching the vicinity of the exit road of the expressway, the control unit 109 may run backward by voice or screen. Notify that there is. For this reason, it is possible to alert the user by notifying that there is a risk of reverse running before going backward on the exit road of the expressway once exited.

  The present invention is not limited to the above embodiments, and various modifications and applications are possible. For example, in the above description, the hardware configuration and the flowchart of the operation shown are merely examples, and the present invention is not limited thereto, and can be changed and applied as appropriate.

In the above embodiment, in order to facilitate understanding, the operation of the navigation device 10 will be described by taking, as an example, the case of entering the SA (or PA) through the exit road from the expressway and then returning to the exit road. However, as shown in FIG. 14, after leaving the main road R1 of the expressway via the exit road R4 to a road R6 (national road, general road, etc.) other than the expressway, and then returning to this taxiway Can also be extended.
In this case, when the road type changes from “intercity highway” or “city highway” to another road type, the control unit 109 may store the current position information of the host vehicle in the position information storage unit 108b.

In the above-described embodiment, in the position information deletion process, the position information of the road type change point is deleted based on the change of the combination of the road type and the link type.
The control unit 109 may delete the position information of the road type change point when the distance between the position of the host vehicle and the road type change point is equal to or greater than a predetermined distance.
Further, the control unit 109 may delete the position information of the road type change point when a predetermined time has elapsed since the position information of the road type change point is stored in the position information storage unit 108b.

In the embodiment described above, the operation of the navigation device 10 has been described by taking the case where the route guidance is not performed as an example in order to facilitate understanding, but the operation is performed similarly even when the route guidance is performed.
In the above embodiment, the reverse running notification device according to the present invention is incorporated in the navigation device 10, but may be incorporated in a notebook PC (Personal Computer), a mobile phone, or the like.
In the above-described embodiment, notification is made by sound and a screen (including a predetermined message and mark), but notification may be made by an indicator using an LED (Light Emitting Diode) or the like.

In the above embodiment, the road type is “other guide roads (general roads)” and the link type is “SA” from the combination of “intercity highway” or “city highway” and the link type “SA equilateral link”. The location of the vehicle when changing to the “Iso equal line link” combination is used as the road type change point. The position of the host vehicle when the link type is changed to a combination of “guide road (general road)” and the link type is “SA equilateral link” may be the road type change point.
Eventually, the road type corresponding to the position of the own vehicle may be the road type change point when the road type corresponding to the position of the own vehicle changes from a road type that does not allow reverse running to a road type other than the road type. It is not limited to the road type (intercity highway, city highway, toll road, etc.) used in

  Note that the navigation device 10 of the present invention does not need to use a dedicated device, and can be realized by a normal computer. For example, a program and data for causing a computer to execute each of the above-described processes are recorded on a recording medium (CD-ROM or the like), distributed, installed, and executed on the OS. Can be realized. Further, the distribution of the program and data is not limited to the CD-ROM or the like, and may be performed via a communication line or the like.

DESCRIPTION OF SYMBOLS 10 Navigation apparatus 101 GPS receiver 102 Gyro sensor 103 Vehicle speed sensor 104 VICS receiver 105 Operation part 106 Display part 107 Voice output part 108 Storage part 108a Map database 108b Location information storage part 108c Road type storage part 108d Parameter storage part 109 Control part 109a Timer R1 Main line R2 Main line R3 Service area R4 Exit road R5 Approach road R6 Roads other than expressways R41 Boundary line R51 Boundary line

Claims (10)

A one-way exit determination unit that determines whether the device has moved from a one-way road to a road other than one-way;
A position information storage unit that stores position information indicating the position of the own device in the storage unit when the one-way / exit determination unit determines that the own device has moved from a one-way road to a road other than one-way; and
It is determined whether or not the device has moved to a range within a second distance that is smaller than or equal to the first distance after being separated from the position indicated by the position information stored in the storage unit by a first distance or more. A position determination unit for
If it is determined by the position determination unit that the device has moved away from the position indicated by the position information stored in the storage unit by the first distance or more and then moved to a range within the second distance, there is a risk of reverse running A notification unit for notifying that there is,
A reverse running notification device characterized by that. A current position determining unit for determining the current position of the own device;
The one-way exit determination unit
A road information storage unit for storing road information and road attribute information;
An exit determination unit that identifies a road from the current position determined by the current position determination unit, and determines that the one-way exit has been made based on attribute information of the road;
The reverse running notification device according to claim 1. The position determination unit is located within a predetermined distance from the position indicated by the position information stored in the storage unit, and the position of the own device and the position indicated by the position information stored in the storage unit. Determine if the distance has decreased over time,
The notification unit is within a predetermined distance from the position indicated by the position information stored in the storage unit by the position determination unit, and the position information stored in the storage unit is stored in the storage unit. If it is determined that the distance to the position shown has decreased with the passage of time, a notice that there is a risk of reverse running,
The reverse running notification device according to claim 1, wherein the reverse running notification device is provided. The notification unit increases the alarm level as the distance between the position indicated by the position information stored in the storage unit and the current position of the device decreases.
The reverse running notification device according to any one of claims 1 to 3, wherein the reverse running notification device is provided. A one-way entry determination unit that determines whether the device has moved from a road other than one-way to a one-way road;
And a position information deletion unit that deletes the position information stored in the storage unit when the one-way entry determination unit determines that the device has moved from a road other than one-way to a one-way road. ,
The reverse running notification device according to any one of claims 1 to 4, wherein the reverse running notification device is provided. A distance determination unit that determines whether or not the device itself is a predetermined distance away from the position indicated by the position information stored in the storage unit;
A position information deletion unit that deletes the position information stored in the storage unit when the distance determination unit determines that the device is separated from the position indicated by the position information stored in the storage unit by a predetermined distance; Further comprising
The reverse running notification device according to any one of claims 1 to 4, wherein the reverse running notification device is provided. A period elapsed determination unit that determines whether or not a predetermined period has elapsed since the position information storage unit stored the position information in the storage unit;
A position information deletion unit that deletes the position information stored in the storage unit when it is determined by the period elapsed determination unit that the predetermined period has elapsed since the position information storage unit stored the position information in the storage unit. And further comprising
The reverse running notification device according to any one of claims 1 to 4, wherein the reverse running notification device is provided. The notification unit notifies that there is a risk of reverse running using at least one of voice and screen.
The reverse running notification device according to any one of claims 1 to 7, wherein the reverse running notification device is provided. A one-way exit determination step for determining whether the device has moved from a one-way road to a road other than one-way; and
When it is determined that the own device has moved from a one-way road to a road other than one-way, a position information storage step for storing position information indicating the position of the own device in the storage unit;
It is determined whether or not the device has moved to a range within a second distance that is smaller than or equal to the first distance after being separated from the position indicated by the position information stored in the storage unit by a first distance or more. A position determination step to be performed;
When it is determined that the device has moved to a range within the second distance after the first distance from the position indicated by the position information stored in the storage unit, a notification that there is a risk of reverse running An informing step,
A reverse running notification method characterized by that. On the computer,
A one-way exit determination procedure for determining whether the device has moved from a one-way road to a road other than one-way;
When it is determined that the own device has moved from a one-way road to a road other than one-way, a position information storage procedure for storing position information indicating the position of the own device in the storage unit;
It is determined whether or not the device has moved to a range within a second distance that is smaller than or equal to the first distance after being separated from the position indicated by the position information stored in the storage unit by a first distance or more. Position determination procedure to be performed,
When it is determined that the device has moved to a range within the second distance after the first distance from the position indicated by the position information stored in the storage unit, a notification that there is a risk of reverse running A notification procedure to be executed,
A program characterized by that.

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