JP2011242228A - Navigation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a navigation device capable of previously presenting a route and required time for avoiding congestion.SOLUTION: A navigation device performs a route search by setting a departure time, a departure place, and a destination as specified by a user, and acquires recommended routes to the destination and an estimated passing time for each main intersection that the user will pass on the recommended route. The device executes the route search which sets these main intersections as departure places in order while shifting the departure time by predetermined times (30 minutes and 1 hour). When an acquired route does not pass a specific main intersection, the device considers the main intersection to be not existent. As a result of these route searches, the device displays an information screen 40 including the recommended routes for each main intersection and the estimated passing times. While traveling, the device switches the recommended routes according to current time.

Description

  The present invention relates to a navigation device.

  There is known a vehicle navigation device that predicts a traffic jam using statistical traffic information and presents a new recommended route for avoiding the traffic jam when the traffic jam occurs (Patent Document 1). In such a navigation device, when a traffic jam is detected, a search for a recommended route is executed again, and route guidance based on a new recommended route is executed.

JP-A-6-208699

  In the conventional navigation device disclosed in Patent Document 1, a route change for avoiding a traffic jam is suddenly performed during route guidance, which may cause confusion to the driver.

  The invention according to claim 1 is a recommended route search means for searching for a recommended route from the departure place to the destination, and a traffic jam information acquisition means for acquiring traffic jam information including information on a traffic jam section and information on a traffic jam occurrence time zone, , Based on the traffic jam information acquired by the traffic jam information acquisition means, a traffic jam section specifying means for specifying a traffic jam section on the recommended route searched by the recommended route search means, and a traffic jam specified by the traffic jam section specifying means Based on the departure time set by the departure time setting means, the departure time setting means for searching for the avoidance route for avoiding the section, the departure time setting means for setting the departure time, the recommended route and the avoidance route Calculating means for calculating a scheduled passage time at a branch point of the vehicle, and for each branch point, based on the traffic jam information at a time obtained by adding a predetermined time to the scheduled passage time. A selection unit that selects a route from a branch point to the next branch point from the recommended route searched by the recommended route search unit and the avoidance route searched by the avoidance route search unit; the recommended route and the selection A navigation apparatus comprising: a map including the route selected by the means; a display control means for displaying the scheduled passage time calculated by the calculation means and the predetermined time on a display monitor. .

  According to the present invention, a route for avoiding traffic congestion is presented in advance to the driver. Thereby, the driver can prepare for a route change during driving.

It is a block diagram which shows the whole structure of the navigation apparatus in 1st Embodiment. In the navigation apparatus 1, it is the screen which displays the result of having performed the route search by setting the scheduled departure time. It is a table | surface which shows the list of main intersections. It is a table | surface which shows the result of the route search performed initially. It is a figure which shows the result of the route search which made the intersection P1 the departure place and made the departure time 15:00. It is a figure which shows the result of the route search which made intersection P1 the departure place and made the departure time 15:30. It is a figure which shows the result of the route search which made intersection P4 the departure place and made the departure time 17:20. It is a figure which shows the result of the route search which made intersection P4 the departure place and made the departure time 17:50. It is a flowchart which shows route guidance processing. It is a figure for demonstrating the display screen after a driving | running | working start. 5 is a flowchart showing a process for displaying an information screen 40. It is a block diagram which shows the whole structure of the navigation apparatus in 2nd Embodiment.

-First embodiment-
FIG. 1 is a block diagram showing the overall configuration of the navigation device according to this embodiment.
The navigation device 1 includes a control circuit 11, a ROM 12, a RAM 13, a current location detection device 14, an image memory 15, a display monitor 16, a speaker 17, an input device 18, a VICS (registered trademark) (road traffic information communication system) information receiving unit 19, and A disk drive 21 is provided. The disk drive 21 is loaded with a DVD-ROM 22 in which map data is stored.

  The control circuit 11 includes a microprocessor and its peripheral circuits, and performs various controls by executing a control program stored in the ROM 12 using the RAM 13 as a work area. When the control circuit 11 performs a predetermined route search process based on the map data stored in the DVD-ROM 22, the processing result is displayed on the display monitor 16 as a recommended route.

  The current location detection device 14 is a device that detects the current location of the vehicle. The current location device 14 includes a vibration gyro 14a, a vehicle speed sensor 14b, a GPS (Global Positioning System) sensor 14c, and the like. The vibration gyro 14a detects the traveling direction of the vehicle, the vehicle speed sensor 14b detects the vehicle speed, and the GPS sensor 14c detects a GPS signal from a GPS satellite. The navigation device 1 determines a map display range, a route search start point, and the like based on the current location of the vehicle detected by the current location detection device 14, and displays the current location on the map.

  The image memory 15 stores image data to be displayed on the display monitor 16. The image data includes road map drawing data and various graphic data, which are appropriately generated based on the map data stored in the DVD-ROM 22. The navigation device 1 can perform map display and the like by using the image data generated in this way.

  The disk drive 21 reads map data from the DVD-ROM 22. The map data includes map display data, route search data, and the like. The map display data and the route search data include road link information and node information stored in the map data. The link information includes information on the travel time of each link (hereinafter referred to as “link travel time”). The map display data has map data of a plurality of scales from wide areas to details, and the scale of the display map can be changed according to a user request. The map data may be read from a recording medium other than the DVD-ROM 22, such as a CD-ROM or a hard disk.

  The DVD-ROM 22 stores statistical traffic information in addition to map data. Statistical traffic information is obtained by collecting past traffic information and statistically processing the information. By referring to the statistical traffic information, it is possible to acquire information that a traffic jam occurs in a specific time zone in a specific road section.

  The display monitor 16 provides the user with various information such as a road map near the vehicle position as a screen display based on various information such as map data. The speaker 17 outputs sound for instructing the user to perform various input operations and for guiding the route. The input device 18 has an input switch for a user to set various commands, and is realized by an operation panel, a remote controller, or the like. The user sets the destination by operating the input device 18 in accordance with an instruction on the display screen of the display monitor 16 or a voice instruction from the speaker 17.

  When the destination is set by the user, the navigation apparatus 1 performs a route calculation from the current location detected by the GPS sensor 14c to the destination based on a predetermined algorithm. For example, the route calculation is performed by an algorithm that calculates a route that minimizes the travel time from the departure point to the destination (the total of the link travel times). Such route calculation is hereinafter referred to as route search. The route thus obtained (hereinafter referred to as a recommended route) is displayed on the screen in a manner different from other roads by changing the display form, for example, the display color. Thereby, the user can recognize the recommended route on the map on the screen. The navigation device 1 instructs the user in the direction of travel using a screen or voice so that the vehicle can travel according to the recommended route, thereby guiding the route of the vehicle.

  The VICS information receiving unit 19 receives VICS information such as traffic jam information provided from a VICS information center (not shown) and outputs it to the control circuit 11. This VICS information is transmitted mainly by radio beacons installed on highways, optical beacons installed mainly on general roads, or FM multiplex broadcasting. Radio wave beacons and optical beacons transmit VICS information to vehicles passing near the installation site, and FM multiplex broadcasting covers a wider communication area. The navigation device 1 receives the VICS information transmitted by them by the VICS information receiving unit 19. The VICS information received by the VICS information receiving unit 19 is reflected in the route search. For example, the link travel time of a section where traffic is jammed is weighted according to the degree of traffic jam. Therefore, the route search is performed with the weighted link travel time.

  Next, multiple recommended route display for avoiding traffic congestion in the navigation device 1 according to the embodiment of the present invention will be described. When the user sets a departure point, a destination, and a scheduled departure time and gives a route search instruction, the navigation device 1 displays the destination and the estimated arrival time at an intersection that passes along the way to the destination. At the same time, when a traffic jam occurs, another route for avoiding the traffic jam is also displayed. Note that the current position of the vehicle may be automatically set as the departure place, or the user may be able to set an arbitrary point. Similarly, for the departure time, the current time may be set automatically, or the user may set an arbitrary time.

  FIG. 2 is a screen that displays a result of a route search performed by setting a scheduled departure time in the navigation device 1. FIG. 2A is a display screen of the display monitor 16 displaying the recommended route and the surrounding map. FIG. 2B is an information screen displaying recommended route information. The information screen 40 is displayed as a pop-up on the display screen 30. When the user gives an instruction, the information screen 40 can be hidden. Further, the information screen 40 may be transparently displayed in order to improve the visibility of the display screen 30.

  The display screen 30 displays a plurality of recommended routes when the departure point 31 and the destination 36 are set and the scheduled departure time is set to 13:00. These recommended routes are roughly divided into three sections by an intersection 32 and an intersection 35. Serial numbers starting from 1 are displayed at the intersections that divide the sections. In FIG. 2A, 1 is displayed near the intersection 32 and 2 is displayed near the intersection 35. The shaded boxes 51, 52, and 53 represent traffic congestion occurrence prediction sections based on statistical traffic information.

  Next, the recommended route existing in each section will be described. There is only one recommended route in the section between the destination 31 and the intersection 32 (hereinafter, this recommended route is referred to as a route A). Three recommended routes are calculated in the section between the intersection 32 and the intersection 35. The first recommended route is a recommended route that starts from the intersection 32 in the right direction in the figure, passes through the intersection 33 and reaches the intersection 35 (hereinafter, this recommended route is referred to as a route B). The second recommended route is a recommended route that starts from the intersection 32 in the upward direction in the drawing, turns right at the intersection 34, passes through the intersection 33, and reaches the intersection 35 (hereinafter, this recommended route is referred to as a route C). ). The third recommended route is a recommended route that starts from the intersection 32 in the upward direction in the figure, passes through the intersection 34, turns right at the intersection 37, and reaches the intersection 35 (hereinafter, this recommended route is referred to as a route D).

  There are two recommended routes in the section between the intersection 35 and the destination 36. The first recommended route is a recommended route starting from the intersection 35 in the upward direction to the destination 36 (hereinafter, this recommended route is referred to as a route E). The second recommended route is a recommended route starting from the intersection 35 in the right direction in the figure to the destination 36 (hereinafter, this recommended route is referred to as a route F).

  As described above, when a plurality of recommended routes exist in one section, each recommended route is drawn with a different line type, and thus the user can distinguish these recommended routes.

  Next, the information screen will be described in detail. On the information screen 40 in FIG. 2B, a simplified version of the above-described section and recommended route is displayed. Square boxes 41, 42, 43, and 44 represent the departure point 31, the intersection 32, the intersection 35, and the destination 36, respectively. Above the enclosure corresponding to the intersection, the same serial number displayed in the vicinity of the intersection on the display screen 30 is displayed. Therefore, the user associates the intersection on the display screen 30 with the enclosure on the information screen 40. I can think about it. In each box, the scheduled passage time of each point when the departure time is set to 13:00 is displayed.

  The straight line connecting the boxes represents each of the recommended routes described above. Specifically, straight line 45 represents path A, straight line 46 represents path B, straight line 47 represents path C, straight line 48 represents path D, straight lines 49A and 49B represent path E, and straight line 50 represents path F. Show. The line type and drawing color of these straight lines match the line type and drawing color of each recommended route on the display screen 30.

  Here, attention is paid to the box 42 of the information screen 40. This box corresponds to the intersection 32 on the display screen 30. The display of “14:30” in the box 42 means that the departure time at the intersection 32 is 14:30 when the departure point is 13:00 and the vehicle travels through the shortest recommended route. . Further, the display of “+0: 30” present on the left side of the straight line 47 indicates that the arrival at the intersection 32 is delayed by 30 minutes, that is, when the arrival at the intersection 32 is 15:00, The route toward the intersection 35 through the route C shown is the shortest route.

  Similarly, “+1: 00” is written on the left side of the straight line 48 when the arrival at the branch point 32 at 15:30, which is one hour later than the scheduled arrival at the intersection 32, goes to the intersection 35 through the route D. This means that the route to go is the shortest route. Thus, in addition to the shortest recommended route when arriving at the intersection as scheduled, each intersection will have the shortest recommended route when arrival at the intersection is delayed by 30 minutes and the shortest when delayed by one hour. The recommended route is displayed. If there is no change in traffic due to delay, the same recommended route may be displayed multiple times.

  As described above, by displaying the information screen 40 together with the display screen 30, the user can know in advance the route to be traveled when arriving at each intersection with a predetermined time delay.

  Next, processing for displaying the display screen 30 and the information screen 40 shown in FIG. 2 will be described with reference to FIGS. The process of displaying the recommended route and the information screen is performed by repeatedly performing a route search considering statistical traffic information a plurality of times. First, a route search is performed in which the departure point, the destination, and the departure time are set as specified by the user. At this time, in addition to the recommended route, the scheduled passage time of each main intersection is acquired simultaneously. Thereafter, a plurality of recommended routes between the main intersections are acquired by repeatedly performing a route search in which each main intersection is set as the departure point while changing the departure time.

  FIG. 3 is a diagram showing a list of main intersections. The intersection for which the scheduled passage time is displayed on the information screen 40 is selected from predetermined main intersections. Of the intersections included in the map of FIG. 2A, the main intersections for which the scheduled passage time is displayed are the intersections 61 to 67 shown in the map 71 of FIG.

  FIG. 4 is a diagram illustrating a result of a route search performed first. First, a route search is performed by setting a departure time, a departure place, and a destination as specified by the user. In FIG. 4, the departure time is 13:00, the departure point is a point 31, and the destination is a point 36. In this route search, the scheduled passage time for each main intersection through which the recommended route passes is acquired simultaneously with the recommended route to the destination. The recommended route shown in FIG. 4 passes through the intersections 63, 64, 67, and 66 among the main intersections shown in FIG. In the following description, these intersections are referred to as P1, P2, P3, and P4. Further, the scheduled passage times of these intersections are 14:30, 15:00, 16:00, and 16:50, and the estimated arrival time at the destination is 18:00.

  Next, a route search using the first intersection P1 as a departure point is sequentially executed while changing the departure time. From FIG. 4, the expected passage time of the intersection P1 is 14:30, so the route search is performed using the time obtained by adding 0:30 and 1:00 to the departure time. FIG. 5 is a diagram showing the results of a route search with the intersection P1 as the departure place and the departure time at 15:00. FIG. 6 is a diagram showing the results of route search with the intersection P1 as the departure point and the departure time at 15:30.

  In FIG. 5, since the traffic jam section 51 exists so as to cover the intersection P2, a route that avoids the traffic jam section 51 is selected as the recommended route. This recommended route does not pass through the intersections P2 and P3. Also in FIG. 6, there is a traffic jam section 52 different from that in FIG. 5, and a route that avoids the traffic jam section 52 is selected as the recommended route. Further, the scheduled passage times of the intersection P4 are 17:50 and 18:20, respectively.

  From the results of FIGS. 5 and 6, the information screen 40 shown in FIG. 2B indicates that the route C should be selected when arriving at the intersection 32 with a delay of 30 minutes, and that the delay is 1 hour. Is displayed, the route D should be selected. Further, since there is a recommended route that does not pass through the intersections P2 and P3, information on the intersections P2 and P3 is not described in the information screen 40.

  Next, similarly to the intersection P1, the route search using the common intersection P4 of FIGS. 4, 5 and 6 as the departure point is executed in order while changing the departure time. The intersections P2 and P3 are not subject to processing because there are recommended routes that do not pass through these intersections. From FIG. 4, the expected transit time at the intersection P4 is 16:50, and the route search is performed with the time obtained by adding 0:30 and 1:00 to the departure time. FIG. 7 is a diagram showing the results of a route search with the intersection P4 as the departure place and the departure time at 17:20. FIG. 8 is a diagram showing the results of a route search with the intersection P4 as the departure point and a departure time of 17:50.

  In FIG. 7, since the traffic jam section 53 exists on the route that can be headed to the destination 36 in the shortest time, a route that avoids the traffic jam section 53 is selected as the recommended route. In FIG. 6, since the traffic jam section 53 does not exist, the recommended route is the same route as in FIG.

  From the results of FIGS. 7 and 8, the information screen 40 shown in FIG. 2B indicates that the route F should be selected when arriving at the intersection 35 with a delay of 30 minutes, and that the information screen 40 shown in FIG. It is described that the route E should be selected when it arrives. As described above, the display screen 30 and the information screen 40 shown in FIG. 2 are displayed.

  Next, route guidance performed during traveling based on the recommended route described above will be described. FIG. 9 is a flowchart showing route guidance processing. First, in step S1, the above-described multiple route search process is performed. In step S2, it is determined whether traveling has started. Step S2 is repeated until the running is started, and when the running is started, the process proceeds to step S3. In step S3, route guidance processing described later is executed. In step S4, it is determined whether or not the route guidance is finished. When the route guidance is terminated due to reasons such as reaching the destination, an affirmative determination is made in step S4, and the process is terminated. On the other hand, if a negative determination is made in step S4, the process returns to step S3.

  Next, the route guidance process shown in step S3 of FIG. 9 will be described using an example. Assume that the departure time is set to 13:00 and the vehicle starts to travel. FIG. 10 is a diagram for explaining a display screen after the start of traveling. When setting the route guidance and confirming the recommended route, all recommended routes are displayed on the display screen 30 as shown in FIG. 2A. After the start of traveling, the above procedure is used as shown in FIG. 10A. Only the obtained recommended route with the shortest required time is displayed, and other routes for avoiding the traffic jam section are deleted from the map. That is, only the routes A, B, and E are displayed this time.

  After the start of traveling, the navigation device 1 is generated on a recommended route scheduled to travel in the future based on the position of the vehicle detected by the current location detection device 14, the current time, and the traffic congestion information obtained from the statistical traffic information. Then, an expected traffic jam section is specified, and it is determined whether or not the traffic jam section should be avoided. At this time, if there is a traffic jam section on the recommended route, it may be determined that it should be avoided preferentially, or the travel time required for the traffic jam section and the required travel time when traveling on the recommended route to avoid the traffic jam section It may be determined whether or not a traffic jam section should be avoided by comparing the time. The current time can be detected based on the GPS signal received by the GPS sensor 14c.

  Here, for example, it is assumed that a delay of 30 minutes occurs on the route A and the intersection 32 is actually reached at 15:00. The shortest recommended route from the intersection 32 to the destination was the route B at the beginning, but the transit time of the intersection 32 is 15:00, which is 30 minutes later than planned, so as shown in FIG. The recommended route changes to route C. Therefore, the navigation device in the present embodiment switches the recommended route used for route guidance from the route B to the route C. The display screen 30 at this time is as shown in FIG. In this manner, the route B that is the original recommended route is deleted from the map, and the route C that avoids the traffic jam section 51 is displayed on the map. Thereafter, route guidance is performed according to route C instead of route B.

  As described above, when there is a difference between the scheduled passage time and the actual passage time, the information screen 40 in FIG. 2B may be displayed again. At this time, the recommended route to be selected when the scheduled passage time displayed on the information screen 40 or a predetermined time delay occurs is recalculated based on the actual passage time. The information screen 40 may not always be redisplayed, but may be displayed only when the recommended route to be displayed has changed as a result of recalculation.

  As described above, the navigation apparatus according to the present embodiment dynamically switches recommended routes used for route guidance in order to avoid a traffic jam section based on statistical traffic information. In addition, a recommended route that is a candidate for switching when a delay of a predetermined time occurs is presented in advance. At that time, by displaying the information screen 40, a recommended route corresponding to the generated delay is presented. Then, according to the actual travel time, the optimum route is selected from the recommended routes presented in advance.

  Next, processing for displaying the information screen 40 shown in FIG. 2B will be described with reference to FIG. FIG. 11 is a flowchart showing a process for displaying the information screen 40. First, in step S11, a route search is performed by setting a departure point, a destination, and a scheduled departure time as specified by the user. At this time, not only the recommended route and the estimated arrival time at the destination, but also the list of the main intersections through which the recommended route passes and the acquisition of the scheduled passage time for each main intersection are performed simultaneously. In step S12, the main intersections acquired in step S11 are set as P1, P2,..., P (N−1) in the order of passage. Further, the destination is set as PN. In step S13, the variable i is set to 1.

  In step S14, Pi is set as the departure place, PN is set as the destination, and the time obtained by adding 30 minutes to the scheduled passage time of Pi acquired in step S11 is set as the scheduled departure time, and the route search is performed. A route from Pi to the destination obtained by this route search is called a route X. In step S15, P (i + 1), that is, the intersection where the route X first passes among the intersections from the intersection located next to the departure point in the route search performed in step S14 to PN is set as Px.

  In step S16, a route search is performed in the same manner as in step S14, but a time obtained by adding 1 hour to the scheduled passage time of Pi acquired in step S11 is set as the scheduled departure time. A route from Pi to the destination obtained by this route search is called a route Y. In step S17, as in step S15, among the intersections from P (i + 1) to PN, the intersection at which the route Y first passes is set as Py.

  In step S18, the variable x in step S15 and the variable y in step S17 are compared to determine whether x is smaller than y. If x is smaller than y, an affirmative determination is made in step S18, the process proceeds to step S19, and the value of variable y is set in variable z. On the other hand, if a negative determination is made in step S18, the process proceeds to step S20, and the value of variable x is set in variable z. In step S21, information regarding the intersection Pi is added to the information screen 40 (FIG. 2B). Set the scheduled passage time of the intersection Pi obtained in step S11 as the scheduled passage time, and a section between Pi and Pz from the route obtained in step S11 as a recommended route when passing the intersection Pi at the scheduled passage time Set the route from which Further, as a recommended route when the scheduled passage time is delayed by 30 minutes, a route obtained by cutting out a section between Pi and Pz from the route X is used as a recommended route when delayed by one hour, between the route Y and Pi and Pz. A route that cuts out the section is set.

  In step S22, the value of variable z is set in variable i. In step S23, it is determined whether or not the variable i is equal to N. If the variables i and N are equal, an affirmative determination is made in step S23, and the process ends. On the other hand, if a negative determination is made in step S23, the process returns to step S14. As described above, the main intersection and the recommended route for each main intersection are displayed on the information screen 40.

According to the navigation apparatus according to the first embodiment described above, the following operational effects can be obtained.
(1) A congestion avoidance route when arrival at a main intersection is delayed is displayed in advance. As a result, the user can be prepared for a sudden route change, and there is no confusion when avoiding traffic jams.
(2) A departure place and a scheduled departure time can be set to confirm a plurality of recommended routes and required times. Thereby, even if it is the day before departure, the travel route can be simulated.

-Second embodiment-
In the above-described first embodiment, the recommended route switching performed while traveling is performed only in the traffic jam occurrence prediction section based on the statistical traffic information. In the second embodiment described in detail below, the initially calculated avoidance route is changed based on the actual traffic jam information acquired in real time.

  FIG. 12 is a block diagram showing the overall configuration of the navigation device in the second embodiment. The navigation device 101 includes a communication device 23 in addition to the navigation device 1 in the first embodiment. The communication device 23 is a mobile phone connected to the navigation device 101. The navigation device 101 can communicate with the information center 24 using the communication device 23.

  The control circuit 111 does not have a function of performing a route search. Instead, the route search is performed by the information center 24. When it becomes necessary to execute a route search, the control circuit 111 transmits information (current location, destination, search conditions, etc.) necessary for the route search to the information center 24 using the communication device 23. The information center 24 performs a route search based on the received information and transmits a recommended route to the navigation device 101. In this way, the recommended route can be acquired as if the control circuit 111 is executing a route search.

  As described above, the information center 24 has a function of executing a route search. In addition, the information center 24 accumulates traffic jam information in various places. The information center 24 provides the navigation apparatus 101 with information on the traffic jam that is currently occurring. During the route guidance, the navigation device 101 receives traffic jam information from the VICS information receiving unit 19 or the communication device 23, and executes the route search again and switches the recommended route as necessary.

  According to the navigation apparatus according to the second embodiment described above, the following functions and effects can be obtained in addition to the functions and effects obtained by the navigation apparatus according to the first embodiment. By avoiding traffic jams including real-time traffic jam information, it is possible to deal with traffic jams that cannot be predicted with statistical traffic information, such as traffic jams due to accidents.

The following modifications are also within the scope of the present invention.
(1) In the second embodiment, the navigation device 101 prepares map display data, but the information center may provide all of this. In this case, the navigation device receives all information necessary for screen display from the information center. The multiple recommended route display process for avoiding traffic congestion is also executed by the information center.
(2) The information screen 40 may be displayed on another display device provided in the navigation device, instead of being pop-up displayed on the display screen 30.
(3) A traffic jam time zone may be displayed together with the traffic jam occurrence prediction section displayed on the display screen 30. As a display method, for example, a balloon or the like may be used, or the display method may be displayed directly on a shaded area.
(4) The recommended route displayed on the information screen 40 is not limited to the route when delayed by 30 minutes and the route when delayed by 1 hour. Routes in other cases may be displayed, or these routes may not be displayed. Further, a route when arriving earlier than planned may be displayed.
(5) When the recommended route is displayed on the information screen 40, the same route may not be displayed a plurality of times.

  As long as the characteristics of the present invention are not impaired, the present invention is not limited to the above-described embodiments, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. .

1, 101 Navigation device 11, 111 Control circuit

Claims (5)

A recommended route search means for searching for a recommended route from the starting point to the destination;
A traffic jam information acquisition means for acquiring traffic jam information including traffic jam section information and traffic jam occurrence time zone information;
Based on the traffic jam information acquired by the traffic jam information acquiring means, a traffic jam section specifying means for specifying a traffic jam section on the recommended route searched by the recommended route searching means;
An avoidance route searching means for searching for an avoidance route for avoiding the traffic jam section specified by the traffic jam section specifying means;
Departure time setting means for setting the departure time;
Based on the departure time set by the departure time setting means, the calculation means for calculating a scheduled passage time at a branch point of the recommended route and the avoidance route,
For each branch point, based on the traffic jam information at a time obtained by adding a predetermined time to the scheduled passage time, the recommended route searched by the recommended route search unit is searched for a route from the branch point to the next branch point. A selection means for selecting from a route and the avoidance route searched by the avoidance route search means;
A display control means for displaying on the display monitor the map including the recommended route and the route selected by the selection means, the scheduled passage time calculated by the calculation means, and the predetermined time; A navigation device. The navigation device according to claim 1, wherein
Route guidance means for performing route guidance according to the recommended route;
Position detecting means for detecting the position of the vehicle;
Time detection means for detecting the current time;
And a determination unit that determines whether or not to travel along the avoidance route based on the position detected by the position detection unit, the current time detected by the time detection unit, and the traffic jam information. ,
The navigation apparatus according to claim 1, wherein when the determination unit determines that the vehicle should travel along the avoidance route, the route guidance unit performs route guidance according to the avoidance route instead of the recommended route. The navigation device according to claim 2, wherein
The display control means deletes the avoidance route from the map if the determination means does not determine that the avoidance route should be traveled after starting the route guidance by the route guidance means. When it is determined that the avoidance route should be traveled, the recommended route is erased from the map and the avoidance route is displayed on the map. The navigation device according to claim 2 or 3,
The calculation means calculates an expected delay time with respect to the scheduled passage time when traveling on the avoidance route,
The determination means predicts the time required for passing a traffic jam section on the recommended route based on the position detected by the position detection means, the current time detected by the time detection means, and the traffic jam information. And determining whether or not to travel along the avoidance route based on a comparison result between the required travel time and the expected delay time. The navigation device according to any one of claims 1 to 4,
The navigation apparatus according to claim 1, wherein the display control means displays on the display monitor a map in which the recommended route and the avoidance route are displayed in different colors on the map.

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