JP2006226786A - Navigation system, its control method, and control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a more comfortable and safe drive by induction guide that avoids right turn as much as possible and takes priority of left turn. <P>SOLUTION: When there is a right turn point for right turn as a calculation result of a course, a left-turn priority course calculating section 46 (left-turn priority course calculating means) performs a plurality of left turns in a predetermined limit distance from the point, and thus calculates the left-turn priority course where arrival at the right turn point by rectilinear propagation or arrival at the point on the course passing the right turn point. A left-turn distance setting section 45 (left-turn distance setting means) receives from the operation section a set input of the predetermined limit distance as the total distance per series of left-turn priority course. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a navigation technology that realizes a more comfortable and safe drive by guidance guidance that avoids a right turn as much as possible and gives priority to a left turn.

In recent years, with the development of electronic technology such as GPS, an in-vehicle navigation system (hereinafter referred to as “car navigation”) that is mounted on a vehicle and outputs a current position, a route to a destination, and guidance guidance along the route has been rapidly developed. Popular. Car navigation guidance guidance uses a screen display or synthesized voice to output the direction of travel in front of important points such as right and left turns, and a technique to judge the number of lanes and avoid sudden right and left turn instructions has been proposed. However, conventionally, a right turn and a left turn have been used as necessary to configure a route without distinction due to special consideration.
JP 2002-286474 A

  However, right turns at intersections are more burdensome than left turns.For example, right turns in places where there are no right turn lanes are annoying to the following cars, and even if there are right turn lanes, changing lanes there are repeated safety checks. This is a great stress for the driver. Also, since the right turn passes the opposite lane in the first place, you must wait for the oncoming traffic to be interrupted or stop with a signal or signal, etc., or check the safety on the relatively far pedestrian crossing, In addition, there is a risk of an accident with the opposite motorcycle hidden in the vehicle, and the burden is relatively large. In particular, there are many unguided roads and areas in the use of route guidance by car navigation, and a right turn on such an unfamiliar road becomes a further burden.

  The present invention solves the problems of the prior art as described above, and its purpose is to avoid a right turn as much as possible and to guide a more comfortable and safe drive by giving priority to a left turn under appropriate conditions. Is to realize.

  In order to achieve the above object, according to one aspect of the present invention (claims 1, 4, and 7), an operation unit that receives an operation, an information storage unit and an output unit, a sensor unit for detecting a current position, In a navigation device (a control method and a control program) that includes a control unit that performs information processing using each unit, a map information storage unit that preliminarily stores map information indicating where and what roads are used, A current position detecting means (process) for detecting the current position of the vehicle by the control unit, and a destination which receives a designation of an arbitrary point on the map displayed on the output unit based on the map information A current position detected by the current position detection means (process), a map information storage unit, a route to the destination designated by the designation means (process) and the destination designation means (process); When there is a right turn point that should be turned in the route calculation, the route calculation means (processing) that calculates based on the map information in the above, and by making a left turn a plurality of times within a predetermined limit distance from that point A left turn priority route calculation means (processing) for calculating a left turn priority route to reach a point on a route that has reached or passed through the right turn point; and the route calculation means and a left turn priority route calculation. A route guide means (process) for displaying and guiding the route calculated by the means (process) on the output unit based on the map information is realized (executed).

  In this way, when there is a right turn point in the route, by presenting the user with a route that avoids the right turn only by repeating the left turn, the burden and risk associated with a right turn can be greatly increased even in unfamiliar and unfamiliar areas. Can be reduced. However, because the actual road network is complex and has numerous patterns, left turn priority guidance to avoid a right turn point is only possible when there is a clear pattern that can avoid right turns and a route that matches this condition can be found. To users.

  In another aspect of the present invention (Claims 2, 5, and 8), in each of the above aspects, the left turn priority route calculation means (process) determines a point to start calculating the left turn priority route. The calculation start determination means (process) monitors whether the distance traveled from the start point of the left turn priority route to the end point is within the predetermined limit distance, and a plurality of left turn priority route candidates are calculated. A distance condition determining means (processing) that selects a short traveling distance, and a left-turn-point determining means that determines a left-turning point so as not to continue traveling on the same route in the calculation of the left-turn priority route. And a left turn priority route calculation end determination means (process) for determining a point where the calculation of the left turn priority route should be ended.

  As described above, in the calculation of the left turn priority route, in addition to the determination of each point to start and end of the calculation, the travel distance on the left turn priority route is within a predetermined limit distance or short if there are a plurality of candidates. By making a decision to prioritize a thing, it is possible to guide a reasonable left turn priority route while suppressing wasteful roundabouts.

  In another aspect of the present invention (Claims 3, 6, and 9), in each of the above aspects, the control unit inputs the setting input of the predetermined limit distance as a total distance per series of the left turn priority route. The present invention is characterized in that a left turn distance setting means (processing) is received.

  In this way, as an allowance for circumvention to avoid a right turn, by accepting a setting input from the operation unit in advance for an arbitrary total distance for one left turn priority route, the user's age, time zone, driving Optimum usability can be realized according to individual specific circumstances such as experience and degree of inconvenience.

  As described above, according to the present invention, a more comfortable and safe drive can be realized by guide guidance that avoids a right turn as much as possible and prioritizes a left turn under appropriate conditions.

  Next, the best mode for carrying out the navigation device of the present invention (hereinafter referred to as “the present device”) will be described with reference to the drawings. Note that the assumptions common to the explanation in the background art and the problems are not repeated. The present invention can also be grasped as a control method and control program for a navigation apparatus.

[1. Constitution〕
This apparatus includes the following elements shown in the block diagram of FIG. That is, the operation unit 11 is a button or a touch panel that receives an operation. As the information storage unit S, there are a disk control unit 12 for controlling a disk drive such as a DVD-ROM and an HDD, and various memories M. The storage unit S is map information D1 indicating where and what roads are present. Is a map information storing means for storing in advance.

  In addition to the liquid crystal display panel or the like, synthetic speech or the like may be used as the information output unit 10. In addition, as a sensor unit for detecting the current position, there are an absolute position / azimuth detection unit 1 using a GPS receiver, a relative direction detection unit 2 using a gyro, and a vehicle speed detection unit 3 for vehicle speed pulse processing.

  In addition, in order to improve the accuracy and usability of route calculation and guidance, an FM multiplex reception and processing unit 13, an optical / beacon reception and processing unit 14, a voice recognition unit 15, and the like may be provided.

  Further, there is a control unit 4 such as a CPU that performs information processing using each of the above units, and the output unit 10 and the operation unit 11 are connected to the control unit 4 via a user interface unit 9 that performs signal conversion and the like. In this apparatus, by controlling the control unit 4 with a predetermined program, the following units 41 to 41 shown in the control unit 4 in FIG. 1 are realized. These units implement means for performing the following processes. It is.

[2. Outline of the effect)
That is, the current position detection unit 41 (current position detection means) detects the current position of the vehicle using the sensor units (1 to 3). The destination designation unit 42 (destination designation means) receives designation of an arbitrary point on the map displayed on the output unit 10 based on the map information and sets it as the destination. The route calculation unit 43 (route calculation means) includes a current position detected by the current position detection unit 41, a map information D1 in the storage unit S, and a route toward the destination specified by the destination specification unit 42. Calculate based on

  Further, when there is a right turn point to be turned right in the route calculation, the left turn priority route calculation unit 46 (left turn priority route calculation means) performs the left turn a plurality of times within a predetermined limit distance from the point. A left turn priority route that reaches a point on a route that reaches the point and reaches the point or passes through the right turn point is calculated. Then, the route guide unit 44 (route guide means) displays and guides the route calculated by the route calculation unit 43 and the left turn priority route calculation unit 46 on the output unit 10 based on the map information D1.

  In this way, when there is a right turn point in the route, by presenting the user with a route that avoids the right turn only by repeating the left turn, the burden and risk associated with a right turn can be greatly increased even in unfamiliar and unfamiliar areas. Can be reduced.

  In the left turn priority route calculation unit 46, the start determination unit 61 (left turn priority route calculation start determination means) determines a point where the calculation of the left turn priority route should be started. Further, the distance condition determination unit 62 (distance condition determination means) monitors that the travel distance from the start point to the end point of the calculation of the left turn priority route is within the predetermined limit distance, and the left turn priority route. When a plurality of candidates are calculated, the one with the short mileage is selected. Further, the left turn point determination unit 63 (left turn point determination means) determines a point to turn left so as not to continue traveling on the same route in the calculation of the left turn priority route. The end determination unit 64 (left turn priority route calculation end determination means) determines a point such as the last left turn point at which the calculation of the left turn priority route should be ended.

  As described above, in the calculation of the left turn priority route, in addition to the determination of each point where the calculation should be started and ended, the travel distance on the left turn priority route is within a predetermined limit distance or short if there are a plurality of candidates. By making a decision to prioritize a thing, it is possible to guide a reasonable left turn priority route while suppressing wasteful roundabouts.

  Further, the left turn distance setting unit 45 (left turn distance setting means) receives the setting input of the predetermined limit distance from the operation unit as a total distance per series of the left turn priority routes. In this way, as an allowance for circumvention to avoid a right turn, by accepting a setting input from the operation unit in advance for an arbitrary total distance for one left turn priority route, the user's age, time zone, driving It is possible to realize the optimum usability according to individual specific circumstances such as experience and degree of guidance.

[3. Consideration of specific judgment conditions)
The route guidance with the left turn priority as described above may be performed only when the left turn priority is selected from a menu or the like on the display screen of the navigation device (for example, FIG. 2). In addition, because the actual road network is complex and has numerous patterns, left turn priority guidance to avoid a right turn point is only possible when there is a clear pattern that can avoid a right turn and a route that matches this condition can be found. To users. Here, for specific consideration of the determination condition, an example of an intersection shape, that is, a network structure of a road for examining left turn priority guidance, is shown in FIGS.

  In this type of diagram in this application, a route including a conventional right turn (destination route) is indicated by a one-dot chain line arrow, and a left turn priority guide route is indicated by a dashed arrow. Each point is abbreviated as “p”, and for example, point 1 is indicated as “p1”. Further, when a route passes through a plurality of points such as “p0 → p1 → p2 → p3”, it is abbreviated as “p0 → 1 → 2 → p3”.

First, in the example of FIG. 3, the right turn of p0 can be avoided by proceeding from p0 → 1 → 2 → p0. Similarly, in the example of FIG. 4, the right turn can be avoided by p0 → 1 → 2 → 3 → p0. Even in the example of 5, the right turn can be avoided by proceeding in the order of p0 → 1 → 3 → 4 → 5 → p0. From these examples of FIGS. 3-5, as a pattern that can be guided to the left turn priority,
"After going straight from the right turn point, repeat the left turn several times to reach the right turn point, and the route after going straight at this right turn point is on the destination route"
If the determination condition is cleared, it can be determined that a right turn at p0 can be avoided. Therefore, the following conditions can be defined.

■ Left turn guidance possible condition (basic condition A1)
That is, the condition is as follows: From the above example, after going straight from the right turn point, repeat several left turns to reach the right turn point, and the route after going straight to the right turn point is on the destination route.
That's it.

  However, for example, in FIG. 3, if a route of p0 → 1 → 2 → p0 is searched, if the travel distance is 100 km, it is not realistic to go around to avoid the right turn of p0. That is, the upper limit of the travel distance when the basic condition A1 is satisfied is necessary. That is, the following conditions are determined.

■ Left turn guidance possible condition (distance condition A2)
This condition is
“The above basic condition A1 holds within a certain distance from the right turn point”
That's it.

Next, when looking at FIG. 6, it is possible to proceed as p0 → 1 → 3 → p4, but after the left turn of p4, the next left turn point X is not found, that is, up to the right turn point within the condition of the distance condition A2. It can be judged that there was no left turn route.
That means
Determination distance of distance condition A2 (predetermined limit distance): L
Distance from p0 to p1: L01
Distance from p1 to p3: L13
Distance from p3 to p4: L34
Distance from p4 to point X: L4X
Then,
Determination of p1: L01 <L (OK)
Determination of p3: L01 + L13 <L (OK)
Determination of p4: L01 + L13 + L34 <L (OK)
And up to p4 is within a predetermined limit distance. However, at a point X beyond that,
Determination of point X: L01 + L13 + L34 + L4X> L (NG)
It becomes.

That is, since the left turn point X after the left turn at p4 is not found within the determination distance of the distance condition A2, the left turn at p4 may be determined as a failure. As described above, when it is determined that the left turn of p4 is unsuccessful, p4 tries to go straight, and if the left turn point cannot be found after going straight, the failure is similarly determined. Previously, for example, having advanced to p4 at p1, for example, can also be determined as a cause of failure in a chained manner.
In this way, it is possible to determine the failure when going straight in connection with the determination of the left turn failure as described above.

■ Condition B1 for turning left
"If the next left turn point cannot be found within the total distance to the left turn point <distance condition A2 judgment distance, the left turn point fails"
Judgment conditions regarding left turn points can be defined.

From this, p4 fails because there is no left turn point after turning left or straight ahead, and p3 fails because it cannot proceed to anything other than p4.
When the left turn of p1 fails as described above, as shown in FIG. 7, it is possible to search for a route of p2 → 3 → p1 in which p1 goes straight and advances to p2, and p3 turns left at an acute angle. Here, when p1 is turned to the left, it becomes p2 again, and this may be determined as failure. The cause of this failure is that the route once passed is passed again. Therefore,

■ Judgment condition B2 for left turn points
"Passing points once passed fails again"
Can be defined.

Therefore, if you go straight on p1, p5 will be searched, but this point is on the destination route. By turning left at an obtuse angle, you can avoid the right turn of p0. This route has not reached p0, but has reached the destination route after the p0 right turn, and left turn priority guidance is possible.
That is,

■ Left turn guidance possible condition A3
It is possible to define a condition that “it may be possible to reach the destination route by repeating several left turns after going straight from the right turn point”. This is defined as a merging condition A3.

  However, referring to FIG. 8 next, if a left turn point is searched such as p0 → 1 → 2 → 3 → 4 → p0, p4 is on the destination route, so when p4 is searched, the merge condition A3 Is established. However, in this case, although p4 is on the destination route, if it turns left, p0 appears after the left turn, and this eventually makes a p0 right turn and is meaningless. In this case, the route to the destination should be guided from p4 to p5, but this is avoided and p4 left turn and p0 right turn should mean that p4 → p5 should be guided for some reason such as traffic restrictions. It is based on the judgment that there is not. In this case, the cause of the failure is that p4 was before the point p0 on the destination route, and therefore the merging condition A3 is changed more accurately,

■ Left turn guidance possible condition (joining condition A3 modified)
"After going straight from the right turn point, repeat several left turns to reach the destination route, and after passing the right turn point."
It is defined as
In addition, about the judgment of the left turn point,

■ Judgment condition B3 for left turn points
"If the left turn point is on the destination route before passing the right turn point, it will fail"
And can.

As described above, if the left turn priority guidance possible condition and the left turn point judgment condition are put together and the condition symbols are assigned again,
◆ Left turn priority guidance conditions:
“After going straight from the right turn point, repeat the left turn several times to reach the right turn point, and the route after going straight through this right turn point is on the destination route”… (straight forward arrival condition AA1)
"After going straight from the right turn point, you can reach the destination route by repeating several left turns and after passing the right turn point."
“A straight-line arrival condition AA1 or a post-passage merge condition AA2 is satisfied within a certain distance from the right turn point” (total distance condition AA3)

◆ Left turn point judgment:
“If the next left turn point cannot be searched within the total distance to the left turn point <the total distance condition AA3 determination distance, the left turn point fails”… (left turn distance condition BB1)
“Passing between points that have passed once has failed”… (Repass condition BB2)
“If the left turn point is on the destination route before passing the right turn point,” failure (previous condition BB3)
It becomes.

  However, in addition to the distance restriction for the entire left turn priority route, (1) the total distance from the left turn point to the next left turn point can be restricted within a certain distance. Can be set arbitrarily. Also, (2) when a plurality of routes are calculated, the one with the shorter route distance is selected.

  To summarize, the conditions for starting the calculation of the left turn priority route are as follows: after making multiple left turns, reaching the right turn point and going straight on the route to the destination, or after making multiple left turns It must not be the first left turn point at which the last left turn point cannot be detected when the right turn point is passed after reaching the route to the ground. ”... (Straight line arrival condition AA1, total distance condition AA3 The left turn distance condition BB1) is satisfied.

  Further, as a determination condition regarding each left turn place, “do not select the passage of the left turn point that has passed once and the route of the left turn point question” (re-pass condition BB2). In addition, the condition for completing the calculation of the left turn priority route is as follows: “A point that has reached straight ahead from the last left turn point is the last left turn point that passes the right turn point on the destination route. ”(The post-passage merging condition AA2, the front condition BB3).

[4. Example of processing procedure)
A flowchart summarizing the above is shown in FIG. That is, first, when there is no right turn point in the route (step 02), or when there is no right turn point (step 03), the processing is terminated (step 14), but there is a right turn point on the route (step 02). ) When straight traveling is possible (step 03), the following processing is performed.

  First, a left turn point ahead of a right turn point is searched (step 04). If the searched left turn point is not determined to be within a predetermined limit distance from the right turn point (total distance condition AA3, left turn distance condition BB1) (step 05). ), Return to the previous left turn point (step 12), and if it is the original right turn point (step 13), the process ends (step 14), but if it is not the right turn point (step 13), search for another left turn point (Step 04).

  If the left turn point searched as described above is within the predetermined limit distance (step 05) and has passed (re-pass condition BB2) (step 06), the next left turn point is searched (step 04), but not passed (step 06). ) Returning to the right turn point (step 07), if it is straight ahead and on the destination route (straight travel arrival condition AA1) (step 09), the left turn priority taxiway is fixed and presented (step 11), but it goes straight ahead as it is If not on the route (step 09), another left turn point is searched (step 04).

  Also, if the vehicle has not returned to the right turn point (step 07), if it is not on the destination route (step 08), it proceeds to the next left turn point (steps 11 and 04), but on the destination route (step 08), it turns right After passing the point (post-pass confluence condition AA2, near side condition BB3) (step 10) the left turn priority taxiway is fixed and presented (step 11), and if it is not after the right turn point (step 10) other left turn points Return to the search (step 04).

[5. Illustration〕
Considering the above determination conditions and processing procedure, a left turn priority guidance route illustrated in FIG. 10 is considered. When p0 is a right turn point of a destination route and a left turn priority guidance route for avoiding a right turn at p0 is considered,
Route: p0 → 1 → 2 → p3 left turn returns to the right before the right turn point p0 after p3 left turn, and is therefore inappropriate under the front condition BB3. next,
Route: p0 → 1 → 2 → 3 → p4 Left turn is also unsuitable under the front condition BB3. Also,
The route: p0 → 1 → 2 → 3 → p4 straight travel is not appropriate under the total distance condition AA3, and it also fails due to the left turn distance condition BB1 at the time of p4 straight travel, so p3 (straight travel) leading to p4 is the same Become.

Path: p0 → 1 → 2 → 5 → 6 → 3 → 2 → p5
Becomes inappropriate under the repass condition BB2, and fails due to the left turn distance condition BB1 at the time of p2 left turn. Also,
Route: p0->1->2->5->6-> p3 straight travel returns to the right before the right turn point p0 after p3 straight travel, so it is not appropriate in the front condition BB3, and failed due to the left turn distance condition BB1 at the time of p3 left turn Become. Also,
Path: p0 → 1 → 2 → 5 → 6 → 7 → 4 → 3 → 6 → p7
Will pass through p6 once passed, so it becomes inappropriate under the repass condition BB2,
Route: p0 → 1 → 2 → 5 → 6 → 7 → 4 → 3 → p6 Even if it goes straight, it becomes inappropriate under the total distance condition AA3, and when p6 goes straight, it becomes inappropriate due to the left turn distance condition BB1,
Path: p0 → 1 → 2 → 5 → 6 → 7 → 4 → 3 → 2 → p5
Is unsuitable due to the repass condition BB2 at the point where it passes through p5 once passed, and also fails due to the left turn distance condition BB1 at the time of p2 left turn, so p3 leading to p2 is the same.

Route: p0 → 1 → 2 → 5 → 6 → 7 → p4 straight travel returns to the right before the right turn point p0, so it is not appropriate in the front condition BB3 and also fails due to the left turn distance condition BB1 at the time of p4 straight travel .
Route: p0 → 1 → 2 → 5 → 6 → p7 straight travel is not appropriate under the total distance condition AA3, and due to the left turn distance condition BB1, the straight travel of p7 fails, and so does the straight travel of p6 up to p7.
Route: p0 → 1 → 2 → p5 straight travel is not appropriate under the total distance condition AA3, and also fails due to the left turn distance condition BB1 at the time of p5 straight travel, so p2 (straight travel) leading to p5 is the same.

Path: p0 → 1 → 8 → 9 → 5 → 2 → 1 → p8
Passes through p1 and p8 again, so it becomes inappropriate due to the re-pass condition BB2,
Path: p0 → 1 → 8 → 9 → 5 → 2 → 1 → 10 → 8 → p1
However, because it passes through p8 and p1 again, it becomes inappropriate due to the repass condition BB2,
Path: p0 → 1 → 8 → 9 → 5 → 2 → 1 → 10 → 8 → p9
However, since it passes through p8 and p9 again, it becomes inappropriate due to the re-passing condition BB2, and also fails due to the left turn distance condition BB1 at the point of time when p8 goes straight.
Route: p0 → 1 → 8 → 9 → 5 → 2 → 1 → p10 straight travel is not appropriate under the total distance condition AA3, and p10 straight travel fails under the left turn distance condition BB1.
Path: p0 → 1 → 8 → 9 → 5 → 2 → 1 → p11
Assuming that this route satisfies the condition of the total distance condition AA3, the post-passage merging condition AA2 is also satisfied, and left turn priority guidance is possible, and the route can be presented.

[6. (Effect points)
As described above, when there is a right turn point in the route, by presenting the user with a route that avoids the right turn only by repeating the left turn, the burden and risk associated with the right turn can be greatly increased even in unfamiliar or unfamiliar areas. Can be reduced.

[7. Other embodiments]
In addition, this invention is not limited to the said embodiment, Other embodiments containing the thing illustrated next and others are included. For example, the configurations, processing procedures, and examples shown in the drawings are merely examples, and the present invention can be implemented in a mode freely changed according to the technical common sense of those skilled in the art. In addition, in this application, the left and right expressions are based on Japan and the like where the vehicle is on the left side, but the present invention is naturally applicable to the country and area where the vehicle is on the right side. The left side shall be read in reverse.

The functional block diagram which shows the structure of embodiment of this invention. The figure which shows an example of the network structure of a road in embodiment of this invention. The figure which shows an example of the network structure of a road in embodiment of this invention. The figure which shows an example of the network structure of a road in embodiment of this invention. The figure which shows an example of the network structure of a road in embodiment of this invention. The figure which shows an example of the network structure of a road in embodiment of this invention. The figure which shows an example of the network structure of a road in embodiment of this invention. The figure which shows an example of the network structure of a road in embodiment of this invention. The flowchart which shows an example of the process sequence in embodiment of this invention. The figure which shows an example of the network structure of a road in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Absolute position and direction detection part 2 ... Relative direction detection part 3 ... Vehicle speed detection part 4 ... Control part (Main CPU and its peripheral circuit)
5 ... ROM
6 ... DRAM
7 ... SRAM
8 ... VRAM
DESCRIPTION OF SYMBOLS 9 ... User interface part 10 ... Output part 11 ... Operation part 12 ... Disk control part 13 ... FM multiplex reception and processing part 14 ... Light / beacon reception and processing part D1 ... Map information 41 ... Current position detection part 42 ... Destination specification Unit 43 ... Route calculation unit 44 ... Route guidance unit 45 ... Left turn distance setting unit 46 ... Left turn priority route calculation unit 61 ... Start determination unit 62 ... Distance condition determination unit 63 ... Left turn point determination unit 64 ... End determination unit M ... Memory group

Claims (9)

In a navigation device including an operation unit that receives an operation, an information storage unit and an output unit, a sensor unit for detecting a current position, and a control unit that performs information processing using each unit,
By the control unit,
Map information storage means for storing in advance map information indicating where and what roads exist;
Current position detecting means for detecting the current position of the vehicle;
Destination designation means for accepting designation of an arbitrary point on the map displayed on the output unit based on the map information and serving as a destination;
Route calculation means for calculating a route to the destination designated by the destination designation means based on the current position detected by the current position detection means and the map information in the map information storage means; ,
When there is a right turn point to be turned right in the calculation of the route, by making a left turn a plurality of times within a predetermined limit distance from the point, the straight turn to reach the right turn point or on the route that has passed the right turn point A left turn priority route calculation means for calculating a left turn priority route to reach the point,
Route guidance means for displaying and guiding the route calculated by the route calculation means and the left turn priority route calculation means on the output unit based on the map information;
A navigation device characterized by realizing the above. The left turn priority route calculation means includes:
A left turn priority route calculation start determination means for determining a point where calculation of the left turn priority route should be started;
It is monitored that the travel distance from the start point to the end point of calculation of the left turn priority route is within the predetermined limit distance, and when a plurality of left turn priority route candidates are calculated, the travel distance is short. A distance condition judging means for selecting one,
In the calculation of the left turn priority route, a left turn point determination means for determining a point to turn left so as not to continue traveling on the same route,
A left turn priority route calculation end determination means for determining a point at which the calculation of the left turn priority route should be terminated;
The navigation device according to claim 1, comprising: 3. The navigation according to claim 1, wherein the control unit realizes a left turn distance setting unit that receives a setting input of the predetermined limit distance from the operation unit as a total distance per series of the left turn priority route. apparatus. In a method for controlling a navigation device, comprising: an operation unit that receives an operation; an information storage unit and an output unit; a sensor unit for detecting a current position; and a control unit that performs information processing using the units.
By the control unit,
Map information storage means for storing in advance map information indicating where and what roads exist;
A current position detection process for detecting the current position of the vehicle;
A destination designation process that accepts designation of an arbitrary point on the map displayed on the output unit based on the map information,
A route calculation process for calculating a route to the destination designated by the destination designation process based on the current position detected by the current position detection process and the map information in the map information storage means; ,
When there is a right turn point to be turned right in the calculation of the route, by making a left turn a plurality of times within a predetermined limit distance from the point, the straight turn to reach the right turn point or on the route that has passed the right turn point Left turn priority route calculation processing to calculate the left turn priority route to reach the point,
A route guidance process for displaying and guiding the route calculated by the route calculation process and the left turn priority route calculation process in the output unit based on the map information;
A control method for a navigation device characterized by realizing the above. The left turn priority route calculation process is:
A left turn priority route calculation start determination process for determining a point where calculation of the left turn priority route should be started;
It is monitored that the travel distance from the start point to the end point of calculation of the left turn priority route is within the predetermined limit distance, and when a plurality of left turn priority route candidates are calculated, the travel distance is short. Distance condition determination processing to select a thing,
In the calculation of the left turn priority route, a left turn point determination process for determining a point to turn left so as not to continue traveling on the same route,
A left turn priority route calculation end determination process for determining a point where the calculation of the left turn priority route should be ended;
5. The method of controlling a navigation device according to claim 4, further comprising: 6. The navigation according to claim 4, wherein the control unit realizes a left turn distance setting process in which a set input of the predetermined limit distance is received from the operation unit as a total distance per series of the left turn priority route. Device control method. In a control program for a navigation device including an operation unit that receives an operation, an information storage unit and an output unit, a sensor unit for detecting a current position, and a control unit that performs information processing using each unit,
Using a map information storage means that stores in advance map information indicating where and what roads exist,
By the control unit,
A current position detection process for detecting the current position of the vehicle;
A destination designation process that accepts designation of an arbitrary point on the map displayed on the output unit based on the map information,
A route calculation process for calculating a route to the destination designated by the destination designation process based on the current position detected by the current position detection process and the map information in the map information storage means; ,
When there is a right turn point to be turned right in the calculation of the route, by making a left turn a plurality of times within a predetermined limit distance from the point, the straight turn to reach the right turn point or on the route that has passed the right turn point Left turn priority route calculation processing to calculate the left turn priority route to reach the point,
A route guidance process for displaying and guiding the route calculated by the route calculation process and the left turn priority route calculation process in the output unit based on the map information;
A control program for a navigation device, characterized in that The left turn priority route calculation process is:
A left turn priority route calculation start determination process for determining a point where calculation of the left turn priority route should be started;
It is monitored that the travel distance from the start point to the end point of calculation of the left turn priority route is within the predetermined limit distance, and when a plurality of left turn priority route candidates are calculated, the travel distance is short. Distance condition determination processing to select a thing,
In the calculation of the left turn priority route, a left turn point determination process for determining a point to turn left so as not to continue traveling on the same route,
A left turn priority route calculation end determination process for determining a point where the calculation of the left turn priority route should be ended;
The navigation apparatus control program according to claim 7, further comprising: 9. The navigation according to claim 7, wherein the control unit causes the left turn distance setting process to receive a setting input of the predetermined limit distance from the operation unit as a total distance per series of the left turn priority route. Device control program.

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