JPWO2010109762A1 - NAVIGATION SYSTEM, NAVIGATION METHOD, COMPUTER PROGRAM FOR EXECUTING NAVIGATION METHOD, AND RECORDING MEDIUM CONTAINING THE COMPUTER PROGRAM - Google Patents

Abstract

We propose a countermeasure when the guidance end point corresponding to the destination is set on a parking prohibited road. The navigation system 1 according to the present invention includes an input unit 5 for setting a destination and a parking available road in the vicinity of the destination, and a parking available road having the smallest walking cost between the destination and the parking available road. A parking available road searching unit 33 for searching, and a main route searching unit 31 for searching for a route from the departure place to the parking available road searched by the parking available road searching unit 33 are provided.

Description

  The present invention relates to a countermeasure technique when a guidance end point corresponding to a destination becomes a parking prohibited road when performing route guidance with a navigation system.

Conventionally, when performing route guidance using a navigation system, a guidance end point corresponding to a destination may be set on a parking prohibited road. In this case, the vehicle cannot be parked at the guidance end point.
Therefore, conventionally, a technique has been proposed in which attention is paid to a parking prohibited road with a time zone restriction, and warning is performed in consideration of the time zone and a parking lot is guided (Patent Document 1).
In addition, refer to Patent Document 2 and Patent Document 3 as techniques related to the present invention.

JP 2008-64592 A JP 2008-2819 A JP 2005-55384 A

As explained in the prior art, parking violations can be surely avoided if guided to the parking lot, but if the parking lot is far from the destination or the parking lot is charged, especially parking is desired for a short time. Unable to meet the user's wishes.
Therefore, the present invention proposes a countermeasure when the guidance end point corresponding to the destination is set on the parking-prohibited road on the premise of on-street parking.

An object of the present invention is to solve the above problems. The first aspect of the present invention is defined as follows. That is,
A destination designating unit for designating a destination;
A parking available road search unit for searching for a parking available road near the destination, wherein a walking cost between the destination and the parking available road is minimized;
A main route search unit for searching for a route from a departure place to the parking available road searched by the parking available road search unit;
A navigation system comprising:

According to the navigation system of the 1st situation prescribed | regulated in this way, when searching the parking possible road with respect to the designated destination, the concept called walking cost is employ | adopted. Then, a search is made for a parkable road that minimizes the cost of walking between the destination and the parkable road.
Here, the walking cost is an index of ease of walking between the destination and the parking available road.
As a walking cost, (1) a linear distance between a destination and a parking available road can be used. Moreover, (2) the distance of the path | route between both can be used.
Further, (3) walking cost information is given to road elements (links, nodes, etc.) constituting the route between the two. This walking cost information quantifies the ease of walking for each road element. For example, if there is a pedestrian crossing at the intersection, it is easy to walk, so the walking cost information of the intersection is small. On the other hand, a large amount of walking cost information is assigned to a crossing of a highway with a large number of lanes. And walking cost information is added about each road element which comprises the path | route which connects the destination and the parking possible road, and it is set as a walking cost.
If the nearest road to the destination is a parking available road, the walking cost is minimized.

  Although it is easy to remember the destination that the user designates himself, there is a risk of forgetting the location of the parking available road. Therefore, (4) a landmark in the vicinity of the destination is identified, and a parkable road is identified based on the landmark, for example, based on the rules (1) to (3). As landmarks, public facilities such as schools and parks and commercial facilities such as banks and convenience stores are designated. When a plurality of landmarks exist in the vicinity of the destination, the landmarks can be ranked based on the rules (1) to (3).

The second aspect of the present invention is defined as follows. That is,
In the navigation system defined in the first aspect, the parking available road search unit includes:
A first guidance end point identifying unit for identifying a first guidance end point corresponding to the destination;
When the first guidance end point is a parking prohibited road, a parking target region setting unit that sets a parking target region including the first guidance end point;
A search unit main body for searching for a parkable road with the lowest walking cost from the first guidance end point in the parking target area;
The main route search unit searches for a route with the parking available road searched by the search unit body as a final guidance end point.

  According to the navigation system of the 2nd situation prescribed | regulated in this way, a parking possible road search part searches for a parking possible road within the parking object area | region including the 1st guidance end point. Thereby, since the range which searches a parking possible road is limited, the burden concerning a parking possible road search part is reduced, and the process in a short time is attained.

The third aspect of the present invention is defined as follows. That is,
In the navigation system defined in the second aspect, the main route search unit searches for a route to the final guidance end point via the first guidance end point.
According to the navigation system of the third aspect defined in this way, route guidance to a parking available road (final guidance end point) is executed so as to pass through the first guidance end point. As a result, even a user who does not know the land about the destination can move smoothly from there to the destination after parking the vehicle on the parking available road.
The route from the first guidance end point to the final guidance end point is preferably the route with the lowest walking cost searched by the search unit body.

If the parking prohibited road at the first guidance end point has a time limit, it is preferable to consider this time limit.
Therefore, the fourth aspect of the present invention is defined as follows. That is,
In the navigation system defined in the second or third aspect, an estimated arrival time calculating unit that calculates an estimated arrival time at the first guidance end point;
A first arrival time width setting unit that sets a first arrival time width for the estimated arrival time when a time zone restriction is imposed on the parking prohibition of the road at the first guidance end point; ,
When the first arrival time width is in the parking prohibited time zone, the parking target area setting unit sets the parking target area.

According to the navigation system of the fourth aspect defined in this way, it is not only determined whether or not the estimated arrival time at the first guidance end point is in the parking prohibition time zone as a time, A first arrival time width as a margin is added to the estimated arrival time.
For example, although the estimated arrival time at the first guidance end point does not take the parking prohibition time zone, if it is one minute before that, it is not possible to substantially park at the point. Therefore, a range is given in advance to the arrival time (first arrival time range), and it is determined whether this time range is in the parking prohibited time zone or not. This more reliably prevents the occurrence of parking prohibition violations.
This first arrival time width is a predetermined time from the scheduled arrival time to the future (future side), and the time can be arbitrarily set. For example, the device can automatically add a first arrival time span of 30 minutes to the estimated arrival time. Of course, this first arrival time width can be set manually each time.

The fifth aspect of the present invention is defined as follows. That is,
In the navigation system defined in the fourth aspect, a second arrival time width setting unit that sets a second arrival time width that is wider than the first arrival time width;
A parking continuation possible time calculating unit that calculates a parking continuation possible time when the first arrival time width is out of the parking prohibited time zone and the second arrival time width is in the parking prohibited time zone; In addition.
The navigation system of the fifth aspect defined in this way can be parked if it is the first arrival time width, but if it exceeds that, it becomes a parking violation (the second arrival time width is parked). When it is in the prohibited time zone), the parking continuation time can be guided in advance. Therefore, the navigation system is easier to use.

The sixth aspect of the present invention is defined as follows. That is,
In the navigation system defined in the fourth or fifth aspect, when there is no parking available road in the parking target area and the parking prohibited road is restricted to a parking prohibited time zone, the first A route changing unit is further provided for changing the route such that the arrival time width deviates from the parking prohibited time zone.
According to the navigation system of the sixth aspect thus defined, when there is no parking available road in the parking target area, the arrival time is changed, and parking at the first guidance end point is enabled.
Here, in order to change the arrival time, (1) change the route search mode (for example, delay the estimated arrival time from the highway priority mode to the general road priority mode), (2) departure time It is possible to adopt any method such as changing (3) changing the use section of the expressway, (4) providing a resting time on the way.

In the above explanation, when the first guidance end point is a parking prohibited road, first, a wider area (parking target area) including the first guidance end point is set, and parking is possible within that area. Exploring the road.
However, if there is a time limit on the parking prohibited road at the first guidance end point, parking can be performed by removing this parking prohibited time zone. Then, there is no need to search for the existence of a parking available road in the parking target area.

Therefore, the invention of the seventh aspect is defined as follows. That is,
A destination designating unit for designating a destination;
A first guidance end point identifying unit for identifying a first guidance end point corresponding to the destination;
Searching for a first route to the first guidance end point, and calculating a scheduled arrival time at the first guidance end point according to the first route;
A first arrival time width setting unit for setting a first arrival time width to the estimated arrival time when a parking prohibition time zone is restricted on the road at the first guidance end point;
When the first route is used and the first arrival time width falls within the parking prohibited time zone, the first route is changed so that the first arrival time width deviates from the parking prohibited time zone. A route changing unit for searching for the second route,
A navigation system comprising:

  According to the navigation system of the seventh aspect thus defined, the setting of the parking target area and the search for the parking available road in the area are omitted, so the load on the navigation system is reduced and high-speed processing is performed. It becomes possible.

The eighth aspect of the present invention is defined as follows. That is,
A destination specification step for specifying a destination;
A parking available road search step for searching for a parking available road near the destination, wherein a walking cost between the destination and the parking available road is minimized;
A main route searching step for searching for a route from the departure place to the parking available road searched by the parking available road searching step;
A navigation method comprising:
According to the navigation method of the 8th aspect prescribed | regulated in this way, there exists an effect | action equivalent to a 1st aspect.

The ninth aspect of the present invention is defined as follows. That is,
In the navigation method defined in the eighth aspect, the parking road search step includes:
A first guidance end point identifying step for identifying a first guidance end point corresponding to the destination;
When the first guidance end point is a parking prohibited road, a parking target region setting step for setting a parking target region including the first guidance end point;
A search step for searching for a parkable road with the lowest walking cost from the first guidance end point in the parking target area;
The main route searching step searches for a route with the parking available road searched in the searching step as a final guidance end point.
According to the navigation method of the ninth aspect defined as described above, an operation equivalent to that of the second aspect is achieved.

The tenth aspect of the present invention is defined as follows. That is,
In the navigation method defined in the ninth aspect, the main route searching step searches for a route that reaches the final guidance end point via the first guidance end point.
According to the navigation method of the 10th aspect prescribed | regulated in this way, there exists an effect | action equivalent to a 3rd aspect.

The eleventh aspect of the present invention is defined as follows. That is,
In the navigation method defined in the ninth or tenth aspect, an estimated arrival time calculating step for calculating an estimated arrival time at the first guidance end point;
And a first arrival time width setting step of setting a first arrival time width to the estimated arrival time when a parking prohibition time zone is restricted on the road at the first guidance end point. ,
When the first arrival time width is in the parking prohibited time zone, the parking target area setting step sets the parking target area.
According to the navigation method of the 11th aspect prescribed | regulated in this way, there exists an effect | action equivalent to a 4th aspect.

The twelfth aspect of the present invention is defined as follows. That is,
In the navigation method defined in the eleventh aspect, a second arrival time width setting step of setting a second arrival time width that is wider than the first arrival time width;
When the first arrival time width is out of the parking prohibition time zone and the second arrival time width is within the parking prohibition time zone, a parking continuation time calculation step for calculating a parking continuation time, and In addition.
According to the navigation method of the 12th aspect prescribed | regulated in this way, there exists an effect | action equivalent to a 5th aspect.

The thirteenth aspect of the present invention is defined as follows. That is,
In the navigation method stipulated in the eleventh or twelfth aspect, when there is no parking available road in the parking target area and the parking prohibited road is restricted to a parking prohibited time zone, the first method A route changing step of changing the route so that the arrival time width deviates from the parking prohibited time zone.
According to the navigation method of the 13th aspect prescribed | regulated in this way, there exists an effect | action equivalent to a 6th aspect.

The fourteenth aspect of the present invention is defined as follows. That is,
A destination specification step for specifying a destination;
A first guidance end point identifying step for identifying a first guidance end point corresponding to the destination;
Searching for a first route to the first guidance end point, and calculating an estimated arrival time at the first guidance end point according to the first route;
A first arrival time width setting step of setting a first arrival time width to the estimated arrival time when a parking prohibition time zone is restricted on the road at the first guidance end point;
When the first route is used and the first arrival time width falls within the parking prohibited time zone, the first route is changed so that the first arrival time width deviates from the parking prohibited time zone. A route change step for searching for the second route,
A navigation method comprising:
According to the navigation method of the 14th aspect prescribed | regulated in this way, there exists an effect | action equivalent to a 7th aspect.

Furthermore, the fifteenth aspect of the present invention is defined as follows. That is,
A computer program for navigating a computer,
A destination designation means for designating a destination;
Parking available road search means for searching for a parking available road near the destination, wherein the walking cost between the destination and the parking available road is minimized,
Main route search means for searching for a route from a departure place to the parking available road searched by the parking available road search means;
A computer program characterized by functioning as
According to the computer program of the 15th aspect prescribed | regulated in this way, there exists an effect | action equivalent to a 1st aspect.

The sixteenth aspect of the present invention is defined as follows. That is,
In the computer program defined in the fifteenth aspect, the parkingable road search means includes:
First guidance end point specifying means for specifying a first guidance end point corresponding to the destination;
When the first guidance end point is a parking prohibited road, a parking target region setting means for setting a parking target region including the first guidance end point;
Search means for searching for a parkable road having the lowest walking cost from the first guidance end point in the parking target area,
The main route search means searches for a route with the parking available road searched by the search means as a final guidance end point.
According to the computer program of the 16th aspect prescribed | regulated in this way, there exists an effect | action equivalent to a 2nd aspect.

The seventeenth aspect of the present invention is defined as follows. That is,
In the computer program defined in the sixteenth aspect, the main route search means searches for a route that reaches the final guidance end point via the first guidance end point.
According to the computer program of the 17th aspect prescribed | regulated in this way, there exists an effect | action equivalent to a 3rd aspect.

The eighteenth aspect of the present invention is defined as follows. That is,
In the computer program defined in the sixteenth or seventeenth aspect, the computer further comprises:
An estimated arrival time calculating means for calculating an estimated arrival time at the first guidance end point;
When a parking prohibition time zone restriction is attached to the road at the first guidance end point, it functions as a first arrival time width setting means for setting a first arrival time width to the estimated arrival time,
When the first arrival time width falls within the parking prohibited time zone, the parking target area setting means sets the parking target area.
According to the computer program of the 18th aspect prescribed | regulated in this way, there exists an effect | action equivalent to a 4th aspect.

The nineteenth aspect of the present invention is defined as follows. That is,
In the computer program defined in the eighteenth aspect, the computer is further
Second arrival time width setting means for setting a second arrival time width of a time width wider than the first arrival time width;
When the first arrival time width is out of the parking prohibition time zone and the second arrival time width is in the parking prohibition time zone, the first arrival time width functions as a parking continuation possible time calculating means for calculating a parking continuation possible time Let
According to the computer program of the 19th aspect prescribed | regulated in this way, there exists an effect | action equivalent to a 5th aspect.

The twentieth aspect of the present invention is defined as follows. That is,
In the computer program defined in the eighteenth or nineteenth aspect, the computer further comprises:
When there is no parking available road in the parking target area, and the parking prohibited road is restricted by a parking prohibited time zone, a route is provided so that the first arrival time width deviates from the parking prohibited time zone. Function as a route changing means for changing
According to the computer program of the 20th aspect prescribed | regulated in this way, there exists an effect | action equivalent to a 6th aspect.

The 21st aspect of this invention is prescribed | regulated as follows. That is,
A computer program for navigating a computer,
A destination designation means for designating a destination;
First guidance end point specifying means for specifying a first guidance end point corresponding to the destination;
Searching for a first route to the first guidance end point and calculating a scheduled arrival time at the first guidance end point according to the first route;
A first arrival time width setting means for setting a first arrival time width to the estimated arrival time when a parking prohibition time zone is restricted on the road at the first guidance end point; When the first arrival time width is within the parking prohibition time zone, the first route is changed so that the first arrival time width deviates from the parking prohibition time zone. Route change means for searching for the route of
A computer program that functions as a computer program.
According to the computer program of the 21st aspect prescribed | regulated in this way, there exists an effect | action equivalent to a 7th aspect.

  A recording medium for recording the computer program defined in the fifteenth to twenty-first aspects is defined as the twenty-second aspect.

FIG. 1 is a block diagram showing the configuration of the navigation system of the embodiment. FIG. 2 is a flowchart showing the operation of the navigation system of the embodiment. FIG. 3 is a sub-flowchart showing a modification in step 5 of FIG. FIG. 4 is a sub-flowchart of a modification added after step 9 or step 7 of FIG. FIG. 5 is a conceptual diagram showing a mode for specifying the final guidance end point. FIG. 6 is a conceptual diagram showing another mode for specifying the final guidance end point. FIG. 7 is a conceptual diagram showing a route from the first guidance end point to the final guidance end point. FIG. 8 is a time chart showing the relationship between the first arrival time width T1, the second arrival time width T2, and the parking prohibited time zone. FIG. 9 is a time chart for explaining a mode of changing the arrival time.

Embodiments of the present invention will be described below.
FIG. 1 shows the configuration of the navigation system 1 according to the embodiment.
The control unit 3 is a computer device including a CPU, a buffer memory, and other devices, and controls other elements constituting the navigation system 1. A computer program is stored in the memory unit 4, and this computer program is read into the control unit 3, which is a computer device, and functions. This computer program can be stored in a general-purpose medium such as a DVD.

The input unit 5 is used for setting a destination and the like. A touch panel type input device that cooperates with the display content of the display can be used as the input unit 5.
The own vehicle position detection unit 6 detects the current position of the user terminal using a GPS device or a gyro device.
The output unit 7 includes a display, and displays map information and other information necessary for navigation. The output unit 7 can also include a voice guidance device.
The interface unit 8 connects the navigation system 1 to a wireless network or the like.

  The navigation information storage unit 10 includes a map information storage unit 11, a road information storage unit 13, and a traffic regulation information storage unit 15. The map information storage unit 11 stores information on road elements for defining a map such as link information and node information, information drawn on a map, and the like. The road information storage unit 13 stores road information that defines the characteristics of each road element such as roads and intersections. This road information includes speed limit, road gradient, road type, and the like. The traffic regulation information is stored in the traffic regulation information storage unit 15. As the traffic regulation information, for example, digital traffic regulation data provided by the Japan Traffic Management Technology Association can be used. In the traffic regulation information, traffic regulation information related to road parking such as parking prohibited sections, parking prohibited areas, parking allowed, and time-limited parking sections is stored.

The cost information generation / storage unit 20 generates and stores road element cost information based on the information stored in the navigation information storage unit 10.
The vehicle travel cost information generation unit 21 reads road information stored exclusively in the road information storage unit 13, generates vehicle travel cost information based on a predetermined rule, and stores it in the vehicle travel cost information storage unit 23. The vehicle travel cost generation unit 21 and the storage unit 23 are also provided in a general-purpose navigation system. By adding the vehicle travel cost information of each road element constituting the searched route, the route cost is reduced. can get. The route with the lowest route cost is guided as the recommended route.

  The walking cost information generation unit 25 generates walking cost information, which is an index of ease of walking, in association with each road element from the viewpoint of human walking. When generating the walking cost information of the road element, various types of information stored in the navigation information storage unit 10 are referred to. For example, the presence / absence of a traffic light, the presence / absence of a pedestrian crossing, and the like. The walking cost information generated by the walking cost information generation unit 25 is stored in the walking cost information storage unit 27.

The search unit 30 includes a main route search unit 31 and a parkable road search unit 33.
The main route search unit 31 searches for a route from the departure place to the destination. Generally, the current position detected by the own vehicle position detection unit 6 is the departure point, but the departure point can also be designated by the input unit 5 separately from the current position of the vehicle. When executing the search, the main route search unit 31 refers to various information stored in the navigation information storage unit 10 and vehicle travel cost information of each road element stored in the vehicle travel cost information storage unit 23 to determine the route cost. The recommended route is calculated with the smallest route cost.
In addition, facilities and addresses are designated as destinations, and have a size on a map. Therefore, generally, the nearest road of the designated destination is the route guidance end point.

  When the guidance end point (first guidance end point) corresponding to the destination is a parking prohibited road, the parking target area setting unit 40 sets the parking target area. The parking target area has a predetermined area including the first guidance end point. In this example, a circular area having a radius of 300 m centering on the first guidance end point is defined as the parking target area. Of course, the shape and area of the area can be arbitrarily set.

  The parking available road search unit 33 searches for a parking available road in the parking target area. When the parking available road is searched, the vehicle is guided to the parking available road, so that the driver moves from the parking available road to the destination by walking. Therefore, the parking available road search unit 33 performs parking in the parking target area so that the walking cost between the parking available road and the destination guidance end point is minimized, that is, the burden during walking is reduced most. Identify possible roads. At this time, the parking available road search unit 33 refers to various information stored in the navigation information storage unit 10 and the walking cost information stored in the walking cost information storage unit 27, and ends the final guidance from the first guidance end point. Search the route to the point.

The estimated arrival time calculation unit 50 is provided in a general-purpose navigation system, and calculates the estimated arrival time at the destination when the route searched by the search unit 30 is used.
The arrival time width setting unit 60 includes a first arrival time width setting unit 61 and a second arrival time width setting unit 63. The first arrival time width setting unit 61 sets the first arrival time width to the estimated arrival time calculated by the estimated arrival time calculation unit 50. In this example, 30 minutes is adopted as the first arrival time width, and a time width of 30 minutes is formed from the estimated arrival time to the future side (time progression side).
Note that the estimated arrival time may be included in the first arrival time width. That is, the first arrival time width may exist on the past side of the estimated arrival time. The estimated arrival time does not always match the actual arrival time, so the estimated arrival time deviates from the parking prohibition time zone (see pattern (d) in FIG. 8), but parking when arriving earlier than the scheduled time. This is because it may take a prohibited time zone.

The second arrival time width set by the second arrival time width setting unit 63 is set wider than the first arrival time width and on the future side with respect to the first arrival time width. In this example, 60 minutes is adopted as the second arrival time width, and a time width of 60 minutes is formed from the estimated arrival time to the future side. Thereby, the time zone on the future side for 30 minutes from the end of the first arrival time width is included only in the second arrival time width.
This second arrival time width need not be set.
The first and second arrival time widths can be arbitrarily set. In this example, the first and second arrival time widths are automatically assigned by the arrival time width setting unit 60, but may be selected and set for each route search.

The time comparison unit 70 compares the first arrival time width and the parking prohibited time zone of the road at the first guidance end point. As a result of the comparison, if the first arrival time width is within the parking prohibition time zone width, the parking target area setting unit 40 is set and the parking target area is set as not being able to park on the road at the first guidance end point. The road where parking is possible is made searchable in the area.
The time comparison unit 70 also compares the second arrival time width with the parking prohibition time zone of the road at the first guidance end point. As a result of the comparison, if the second arrival time width is in the parking prohibited time zone (assuming that the first arrival time width is not in the parking prohibited time zone), an alarm signal is output. In response to the alarm signal, the parking continuation possible time calculation unit 75 calculates a time during which parking can continue after arrival. That is, the time difference between the estimated arrival time and the start time of the parking prohibited time zone is calculated. The calculation result is output from the output unit 7 as the parking continuation possible time.

  The route change command unit 80 changes the route when the first arrival time width is applied to the parking prohibition time zone of the road at the guidance end point of the destination and there is no parking available road in the parking target area, A command is output to search unit 30 so that the arrival time width of 1 falls outside the parking prohibition time zone.

  The above navigation system 1 is configured such that the walking cost information generating unit 25, the parking target area setting unit 40, the arrival time width setting unit 60, the time comparison unit 70, and the route change command unit 80 are unique to this invention. The computer program is installed in the computer device of the general-purpose navigation system, and a predetermined information storage area is secured in the memory of the general-purpose navigation system so that the function of the walking cost information storage unit 27 is executed.

The navigation system 1 shown in FIG. 1 is used with all the elements mounted on each vehicle.
In the navigation system of the type in which information processing is performed on the center side and the device mounted on the vehicle functions as a vehicle position detection and user interface, and the vehicle mounting device and the center are connected by communication, the navigation shown in FIG. Among the systems 1, the navigation information storage unit 10, the cost information generation / storage unit 20, the search unit 30, the parking target area setting unit 40, the estimated arrival time calculation unit 50, the arrival time width setting unit 60, the time comparison unit 70, and the route All or any part of the change command unit 80 is arranged on the center side.

Next, the operation of the navigation system will be described (see FIG. 2).
First, it is assumed that the mode in which the user wishes to park on the road at the destination is selected in the navigation system so that the function of the present invention is manifested in the navigation system.
In step 1, the user sets a destination using the input unit 5 as a destination designation unit. In step 3, the first guidance end point corresponding to the destination is specified. Depending on the destination, the guidance end point may be determined as the front or the like. In many cases, the nearest road of the destination is selected, and the road becomes the first guidance end point.

  In step 5, it is verified whether or not the identified first guidance end point is a parking prohibited road. When the first guidance end point is a parking prohibited road, the process proceeds to step 7. When the first guidance end point is a parking available road, or when the first guidance end point is a parking lot attached to the destination, the process proceeds to step 18. That is, since parking is possible at the first guidance end point, in step 18 and step 19, the vehicle travel route from the departure point to the first guidance end point is searched based on the general-purpose navigation function, and the output unit 7 is turned on. To guide you through.

In step 7, a parking target area is set. When the nearest road to the destination OB is the first guidance end point FE, in this example, as shown in FIG. 5, a circle with a radius of 300 m is drawn around the first guidance end point FE, and this circle defines The area to be parked is designated as a parking area 100.
In step 9, it is verified whether or not a parking available road PR exists in the parking target area 100.
In the example of FIG. 5, two parking available roads PR <b> 1 and PR <b> 2 exist in the parking target area 100. Accordingly, the process proceeds to step 11. If there is no parking available road PR in the parking target area 100, the process proceeds to step 18. In this case, since there is no parking available road in any of the parking target areas 100, the guidance to the destination is made according to the principle of the navigation system. In this case, a parking lot near the destination may be guided.

In step 11, the walking cost is calculated.
Calculate the walking cost of the route connecting all the links composing the parking available roads PR1 and PR2 and the first guidance end point FE, extract the link with the lowest walking cost, and finalize the point on the link This is the guidance end point.
In order to calculate the walking cost, the walking cost information generation unit 25 generates walking cost information according to a predetermined rule for each road element (road, intersection, etc.) existing in the parking target area 100, and the walking cost is calculated. The information is stored in the information storage unit 27.
As rules for generating walking cost information, (1) walking cost information having a size proportional to the distance of each link may be used. If this rule is followed, in FIG. 5, the point A on the first parking possible road PR1 is the minimum walking cost point.
Regarding links, the type of road, the presence or absence of a sidewalk, etc. can also be factors that determine the cost of the link.

(2) As a rule for generating walking cost information, it is possible to consider the cost when passing through an intersection. For example, when large walking cost information is given to the intersection with the main road MR, the point B on the second parking available road PR2 becomes the final guidance end point instead of the point A.
As a rule when passing through an intersection, if there is a traffic light, a three-dimensional pedestrian bridge, a pedestrian crossing, a temporary stop, etc. at the intersection, the walking cost for passing can be reduced.

  Further, (3) a parking available road at the shortest distance from the first guidance end point FE may be selected. In the example of FIG. 5, the position of the point C corresponds. Since there is a possibility that another vehicle is parked on the parking available road, there are cases where parking cannot be performed there even if guidance is provided to point A or point B. If so, it is possible to reduce the load on the navigation system as much as possible by setting the point with the shortest straight line distance as the final guidance end point. Since walking is not necessarily on the road, the selection of the shortest distance is one aspect of minimizing walking costs.

  FIG. 6 shows another rule. In this rule, a landmark is first defined in the parking target area 100. In this example, the post office is the first landmark LM1, and the convenience store is the second landmark LM2. First, a landmark LM1 having a straight line distance from the first final guidance point FE is selected, and a second parking target area 101 having a radius of 50 m is set around the first landmark LM1. And in this 2nd parking object area | region 101, a parkable road is searched based on arbitrary rules, such as said (1)-(3). In this example, there is no parking available road in the second parking target area 101 centered on the first landmark LM1.

Therefore, the third parking target area 102 having a radius of 50 m is set with the second landmark LM2 as the center. In this third parking target area 102, there is a second parking available road PR2. In this example, in order to identify the point of the parkable road that has the lowest walking cost in the third parking target area 102, the point D with the shortest distance from the landmark LM2 is selected according to the rule (3) above. Yes.
If the rules described in FIG. 6 are followed, the vehicle can be parked on a road near a landmark that is easily noticeable, so that the vehicle parking position can be easily confirmed when returning from the destination to the vehicle. Thus, reducing the mental burden is an aspect of reducing walking costs.

Which of the above rules is adopted to specify the final guidance point is arbitrary, and the final guidance point may be determined by other methods.
After the final guidance end point A, B, C, or D is specified in this way (step 13), the departure place is specified in step 15. In many cases, the vehicle position detected by the vehicle position detection unit 6 is the departure place.
In step 17, a vehicle travel route from the departure point specified in step 15 to the final guidance end point specified in step 13 is searched using a general-purpose navigation system function.

  In addition, as shown in FIG. 7, when specifying the vehicle travel route to the final guidance end point B, it is preferable that the first guidance end point FE is routed. This is because, by going through the first guidance end point FE, the vehicle once travels around the destination, and therefore can feed the land near the destination. The route from the first guidance end point FE corresponding to the destination to the road where the vehicle is parked (final guidance end point, point B in this example) has the lowest walking cost unless it is a one-way traffic violation. It is preferable that the route be This is because a route that does not impose a burden on walking from the parking position to the destination is automatically presented by passing the route once by vehicle.

When a time zone restriction is applied to the parking prohibited road at the first guidance end point, it is preferable that Step 5 in FIG. 2 executes the process shown in the sub-flowchart in FIG.
In step 51, a departure place and a departure time are designated. In general, the vehicle position detected by the vehicle position detection unit 6 is the departure place, and the current time is the departure time.
In step 52, the route from the departure point designated in step 51 to the destination designated in step 1 is searched using the function of the main route search unit 31, and the estimated arrival time of the destination by the recommended route is calculated.

In step 53, as shown in FIG. 8, the first arrival time width T1 and the second arrival time width T2 are set to the estimated arrival time TA obtained. In this example, a first arrival time width T1 of 30 minutes and a second arrival time width T2 of 60 minutes are set from the expected arrival time TA to the future side (time passage side) from the expected arrival time TA. .
In step 54, the first arrival time width T1 is compared with the parking prohibition time zone, and whether or not they match (that is, whether or not both intersect, in other words, the first arrival time width T1 is parked). Whether or not it takes a prohibited time zone) is verified. As shown by the pattern (A) in FIG. 8, when the first arrival time width T1 coincides with the parking prohibited time zone, the process proceeds to Step 7.

In other cases (pattern (b), pattern (c), pattern (d)), the process proceeds to step 55.
In step 55, the second arrival time width T2 and the parking prohibition time zone are compared, and it is verified whether or not they match. As shown in the pattern (c, d), when the second arrival time width T2 does not coincide with the parking prohibited time zone, the process proceeds to step 18.
On the other hand, as shown by the pattern (b), when the second arrival time width T2 coincides with the parking prohibited time zone, the routine proceeds to step 56.

  In step 56, the time from the estimated arrival time TA to the start time of the parking prohibited time zone (8 o'clock in the case of the pattern (b) shown in FIG. 8) is calculated, and the calculation result is obtained via the output unit 7. Guidance on how long you can continue to park. You may guide only the start time of a parking prohibition time zone.

Even when there is no parking available road in any of the parking target areas 100 (step 9: N), when there is a time zone restriction on the parking prohibited road at the first guidance end point, it is shown in FIG. Processing can be executed. The process shown in FIG. 4 removes the arrival time at the first guidance end point from the parking prohibition time zone, so that parking is possible at the first guidance end point.
First, the arrival time at the first guidance end point is changed by changing the search mode in the main route search unit 31. In step 61, the search mode is switched, and in step 63, the estimated arrival time TA to the first guidance end point is calculated. In step 65, first and second arrival time widths T1 and T2 are set.

In step 67, the first arrival time width T1 and the parking prohibition time zone are compared to verify whether or not they match. As shown by the arrows in FIG. 9, when the two do not match, the vehicle travel route searched in the new search mode specified in step 61 is guided (step 69).
Even if the first arrival time width T1 changes from the initial one, when the first arrival time width T1 still matches the parking prohibited time zone (step 67: match), the search mode is changed sequentially, Steps 61 to 67 are repeated for all search modes (steps 71 and 73). In step 73, P is a natural number and indicates the number of modes that can be selected.

If the match between the first arrival time width T1 and the parking prohibition time zone is not solved no matter which search mode is executed, the process proceeds to step 75.
In step 75, the navigation system 1 asks the user whether the departure time can be changed. If the user allows the departure time to be changed, the process proceeds to step 77 to step 81, where the departure time is automatically advanced or delayed every 15 minutes, and steps 61 to 73 are executed. The departure time can be changed manually by the user.
The change width of the departure time (15 × Q minutes, Q is a natural number) can be arbitrarily set, but in this example, it is set to 2 hours.

Note that the processing shown in FIG. 4 is also executed during guidance of the searched route. For example, in the initial guidance prospect, even if it is scheduled to arrive outside the parking prohibition time zone of the road at the first guidance end point, due to trouble during operation, the estimated arrival time (or the first arrival time width T1) ) May take place during parking prohibited hours. In that case, the process shown in FIG. 4 is executed to change the route.
Step 5: The process of FIG. 4 can be executed after N. According to this, since the setting of the parking target area is eliminated, that is, steps 7 to 13 in FIG. 2 are omitted, the load on the navigation device can be reduced.

  The present invention is not limited to the description of the embodiments and examples of the invention described above. Various modifications may be included in the present invention as long as those skilled in the art can easily conceive without departing from the description of the scope of claims.

DESCRIPTION OF SYMBOLS 1 Navigation system 3 Control part 10 Navigation information preservation | save part 20 Cost information production | generation / preservation | save part 25 Walking cost information production | generation part 27 Walking cost information preservation | save part 30 Search part 33 Parking possible road search part 40 Parking object area | region setting part 60 Arrival time width setting Unit 70 time comparison unit 80 route change command unit

Claims (22)

A destination designating unit for designating a destination;
A parking available road search unit for searching for a parking available road near the destination, wherein a walking cost between the destination and the parking available road is minimized;
A main route search unit for searching for a route from a departure place to the parking available road searched by the parking available road search unit;
A navigation system comprising: The parking available road search unit
A first guidance end point identifying unit for identifying a first guidance end point corresponding to the destination;
When the first guidance end point is a parking prohibited road, a parking target region setting unit that sets a parking target region including the first guidance end point;
A search unit main body for searching for a parkable road with the lowest walking cost from the first guidance end point in the parking target area;
The main route search unit searches for a route with the parking available road searched by the search unit body as a final guidance end point,
The navigation system according to claim 1.   The navigation system according to claim 2, wherein the main route search unit searches for a route that reaches the final guidance end point via the first guidance end point. An estimated arrival time calculation unit for calculating an estimated arrival time at the first guidance end point;
A first arrival time width setting unit that sets a first arrival time width to the estimated arrival time when a parking prohibition time zone is restricted on the road at the first guidance end point; ,
The navigation system according to claim 2 or 3, wherein the parking target area setting unit sets the parking target area when the first arrival time width is in the parking prohibited time zone. A second arrival time width setting unit for setting a second arrival time width of a time width wider than the first arrival time width;
A parking continuation possible time calculating unit that calculates a parking continuation possible time when the first arrival time width is out of the parking prohibited time zone and the second arrival time width is in the parking prohibited time zone; The navigation system according to claim 4, further comprising:   When there is no parking available road in the parking target area, and the parking prohibited road is restricted by a parking prohibited time zone, a route is provided so that the first arrival time width deviates from the parking prohibited time zone. The navigation system according to claim 4, further comprising a route changing unit that changes A destination designating unit for designating a destination;
A first guidance end point identifying unit for identifying a first guidance end point corresponding to the destination;
Searching for a first route to the first guidance end point, and calculating a scheduled arrival time at the first guidance end point according to the first route;
A first arrival time width setting unit for setting a first arrival time width to the estimated arrival time when a parking prohibition time zone is restricted on the road at the first guidance end point;
When the first route is used and the first arrival time width falls within the parking prohibited time zone, the first route is changed so that the first arrival time width deviates from the parking prohibited time zone. A route changing unit for searching for the second route,
A navigation system comprising: A destination specification step for specifying a destination;
A parking available road search step for searching for a parking available road near the destination, wherein a walking cost between the destination and the parking available road is minimized;
A main route searching step for searching for a route from the departure place to the parking available road searched by the parking available road searching step;
A navigation method comprising: The parking road search step includes:
A first guidance end point identifying step for identifying a first guidance end point corresponding to the destination;
When the first guidance end point is a parking prohibited road, a parking target region setting step for setting a parking target region including the first guidance end point;
A search step for searching for a parkable road with the lowest walking cost from the first guidance end point in the parking target area;
The main route search step searches for a route with the parking available road searched in the search step as a final guidance end point,
The navigation method according to claim 8, wherein:   The navigation method according to claim 9, wherein the main route searching step searches for a route that reaches the final guidance end point via the first guidance end point. An estimated arrival time calculating step for calculating an estimated arrival time at the first guidance end point;
A first arrival time width setting step of setting a first arrival time width to the estimated arrival time when a parking prohibition time zone is restricted on the road at the first guidance end point; ,
The navigation method according to claim 9 or 10, wherein the parking target area setting step sets the parking target area when the first arrival time width falls within the parking prohibited time zone. A second arrival time width setting step of setting a second arrival time width of a time width wider than the first arrival time width;
When the first arrival time width is out of the parking prohibition time zone and the second arrival time width is within the parking prohibition time zone, a parking continuation time calculation step for calculating a parking continuation time, and The navigation method according to claim 11, further comprising:   When there is no parking available road in the parking target area, and the parking prohibited road is restricted by a parking prohibited time zone, a route is provided so that the first arrival time width deviates from the parking prohibited time zone. The navigation method according to claim 11, further comprising a route changing step for changing the route. A destination specification step for specifying a destination;
A first guidance end point identifying step for identifying a first guidance end point corresponding to the destination;
Searching for a first route to the first guidance end point, and calculating an estimated arrival time at the first guidance end point according to the first route;
A first arrival time width setting step of setting a first arrival time width to the estimated arrival time when a parking prohibition time zone is restricted on the road at the first guidance end point;
When the first route is used and the first arrival time width falls within the parking prohibited time zone, the first route is changed so that the first arrival time width deviates from the parking prohibited time zone. A route change step for searching for the second route,
A navigation method comprising: A computer program for navigating a computer,
A destination designation means for designating a destination;
Parking available road search means for searching for a parking available road near the destination, wherein the walking cost between the destination and the parking available road is minimized,
Main route search means for searching for a route from a departure place to the parking available road searched by the parking available road search means;
A computer program characterized by functioning as The parking road search means
First guidance end point specifying means for specifying a first guidance end point corresponding to the destination;
When the first guidance end point is a parking prohibited road, a parking target region setting means for setting a parking target region including the first guidance end point;
Search means for searching for a parkable road having the lowest walking cost from the first guidance end point in the parking target area,
The main route search means searches for a route with the parking available road searched by the search means as a final guidance end point,
The computer program according to claim 15.   The computer program according to claim 16, wherein the main route search means searches for a route that reaches the final guidance end point via the first guidance end point. Said computer further
An estimated arrival time calculating means for calculating an estimated arrival time at the first guidance end point;
When a parking prohibition time zone restriction is attached to the road at the first guidance end point, it functions as a first arrival time width setting means for setting a first arrival time width to the estimated arrival time,
18. The computer program according to claim 16, wherein the parking target area setting unit sets the parking target area when the first arrival time width falls within the parking prohibition time zone. Said computer further
Second arrival time width setting means for setting a second arrival time width of a time width wider than the first arrival time width;
When the first arrival time width is out of the parking prohibition time zone and the second arrival time width is in the parking prohibition time zone, the first arrival time width functions as a parking continuation possible time calculating means for calculating a parking continuation possible time. The computer program according to claim 18, wherein:   The first arrival time width is the parking prohibited time when the computer further has no parking available road in the parking target area and a parking prohibited time zone is restricted on the parking prohibited road. The computer program according to claim 18 or 19, wherein the computer program functions as a route changing unit that changes a route so as to be out of the band. A computer program for navigating a computer,
A destination designation means for designating a destination;
First guidance end point specifying means for specifying a first guidance end point corresponding to the destination;
Searching for a first route to the first guidance end point and calculating a scheduled arrival time at the first guidance end point according to the first route;
A first arrival time width setting means for setting a first arrival time width to the estimated arrival time when a parking prohibition time zone is restricted on the road at the first guidance end point;
When the first route is used and the first arrival time width falls within the parking prohibited time zone, the first route is changed so that the first arrival time width deviates from the parking prohibited time zone. Route changing means for searching for the second route,
A computer program that functions as a computer program.   A recording medium for recording the computer program according to any one of claims 15 to 21.

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