JP4826393B2 - Route guidance system and route guidance method - Google Patents

Description

  The present invention relates to a route guidance system and a route guidance method.

  Conventionally, in a navigation device, when a driver inputs a destination and sets a search condition, a route search process is performed based on the search condition, and from the departure point represented by the current location to the destination according to map data The route is searched. Then, the searched route, that is, the searched route is displayed on the map screen formed on the display unit together with the position of the vehicle, and the guidance of the searched route, that is, route guidance is performed. Therefore, the driver can drive the vehicle along the displayed search route.

  By the way, in the route guidance, when it is necessary to turn the vehicle right or left at a predetermined point, for example, an intersection, for example, a voice is output before the vehicle reaches the intersection, that is, the guidance intersection as a guidance point. By doing so, route guidance is performed. For this purpose, a plurality of route guidance points are set at locations that are separated from each of the set distances before the guidance intersection on the searched route, and when the vehicle reaches each route guidance point, for each route guidance point, The route guidance having contents set in advance is output by voice (for example, see Patent Document 1).

In addition, in a navigation device that can perform route guidance in units of lanes, that is, lane guidance, when a plurality of lanes are formed on a road that enters the guidance intersection, a predetermined lane travels. Is recommended as a recommended lane, that is, a recommended lane. For example, lane guidance is performed using a guidance phrase such as “the lane from the right is the recommended lane”. Therefore, the driver can move the vehicle from the currently traveling lane, that is, the traveling lane to the recommended lane according to the lane guidance.
JP 7-98223 A

  However, in the conventional navigation device, the guidance phrase is set by calculating the number of recommended lanes from the right side or the left side of the road and the lane guidance is performed. If the number of road lanes increases or decreases during or before or after the lane guidance is performed, the number of lanes on the road changes, and the driver cannot determine which lane is the recommended lane.

  The present invention solves the problems of the conventional navigation device, and provides a route guidance system and a route guidance method that can reliably determine which lane is a recommended lane even when the number of road lanes increases or decreases. The purpose is to provide.

  Therefore, in the route guidance system of the present invention, a current location detection unit that detects the current location of the host vehicle as the host vehicle location, a route search processing unit that searches a search route to the destination based on the host vehicle location, Based on the searched route, recommended lane setting processing means for setting recommended lanes recommended to travel, whether or not lanes are assumed to increase or decrease during lane guidance, and lanes increase or decrease A lane increase / decrease determination processing means for determining the direction, and a number of lanes up to the recommended lane based on the direction of the lane increase / decrease when the lane is assumed to increase / decrease during the lane guidance. A base point setting processing unit configured to set a base point; and a guidance processing unit configured to perform lane guidance to a recommended lane using the number of lanes counted from the set base point.

  According to the present invention, when the road lane is assumed to increase or decrease during the lane guidance or before and after the lane guidance is performed, the base point for counting the lanes up to the recommended lane is set, Since the lane guidance to the recommended lane is performed using the number of lanes counted from the set base point, the number of road lanes does not change during the guidance. Therefore, the driver can surely determine which lane is the recommended lane.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, a navigation system as a route guidance system will be described.

  FIG. 1 is a diagram showing a navigation system according to an embodiment of the present invention.

  In the figure, reference numeral 10 denotes an automatic transmission control unit, and the automatic transmission control unit 10 controls the automatic transmission. Reference numeral 14 is an information terminal, for example, a navigation device as an in-vehicle device mounted on a vehicle, 63 is a network, 51 is an information center as an information provider, and the automatic transmission control unit 10, the navigation device 14, the network 63, the information center 51 and the like constitute a navigation system.

  The navigation device 14 includes a GPS sensor 15 as a current location detection unit that detects the current location of the vehicle as the vehicle position, a data recording unit 16 as an information recording unit in which various types of information are recorded in addition to map data, navigation processing, and the like. A navigation processing unit 17 that performs various calculation processes, a direction sensor 18 as a direction detection unit that detects the direction of the vehicle, and a first input unit for performing a predetermined input when operated by a driver as an operator As the operation unit 34, various displays are performed by an image formed on a screen (not shown), and the display unit 35 as a first output unit for notifying the driver, the driver performs a predetermined input by voice. The voice input unit 36 as the second input unit of the second, a second for notifying the driver of various information by voice (included in the display in a broad sense). A voice output unit 37 serving as a power unit, and a communication unit 38 serving as a transmission / reception unit functioning as a communication terminal. The navigation processing unit 17 includes a GPS sensor 15, a data recording unit 16, a direction sensor 18, an operation unit 34, a display The unit 35, the audio input unit 36, the audio output unit 37, and the communication unit 38 are connected.

  The navigation processing unit 17 includes a front monitoring device 48 for monitoring the front of the vehicle, a back camera (rear monitoring camera) 49 as an imaging device for photographing the rear of the vehicle, and as a rear monitoring device, An accelerator sensor 42 as an engine load detection unit that detects an operation of an accelerator pedal (not shown) by the driver based on an accelerator opening, and a brake sensor 43 as a brake detection unit that detects an operation of a brake pedal (not shown) by the driver based on a brake depression amount. The vehicle speed sensor 44 as a vehicle speed detection unit for detecting the vehicle speed is provided.

  The accelerator sensor 42, the brake sensor 43, etc. constitute an operation detection unit for detecting the operation of the vehicle by the driver. That is, the accelerator sensor 42 constitutes an acceleration operation detection unit that detects an operation of the driver to accelerate the vehicle, and the brake sensor 43 includes a deceleration operation detection unit that detects an operation of the driver to decelerate the vehicle. Constitute.

  The GPS sensor 15 detects the current location on the earth and also detects the time.

  The data recording unit 16 includes a map database (not shown) composed of map data files, and map data is recorded in the map database. The map data includes intersection data related to intersections (branch points), node data related to nodes, road data related to road links, search data processed for searching, facility data related to facilities, and other features on the road. Feature data for is included.

  The feature is a display object that is installed or formed on a road in order to provide various driving information to the driver or to perform various driving guidance. , Crosswalks, manholes, traffic lights, etc. The display line includes a stop line for stopping the vehicle, a vehicle lane boundary line that divides each lane, a partition line that indicates a parking space, and the road sign indicates an advancing direction in each lane. , A guidance sign for notifying a stop point such as “stop”, and the like. The feature data includes position information that represents the position of each feature by coordinates, image information that represents each feature by image, and the like. The temporary stop points include an entry point from a non-priority road to a priority road, a railroad crossing, an intersection where a red light flashes, and the like.

  In addition, the road data relating to the lane includes lane data as lane information including the number of lanes, the lane number assigned to each lane on the road, the position of the lane, the traffic classification indicating the traveling direction for each lane, and the like. It is. Data for outputting predetermined information by the audio output unit 37 is also recorded in the data recording unit 16.

  Further, the data recording unit 16 is provided with a statistical database (not shown) composed of a statistical data file, a travel history database (not shown) composed of a travel history data file, and the like, and the statistical data is stored in the statistical data file. The travel history data is recorded as actual data in the file.

  The data recording unit 16 includes a disk (not shown) such as a hard disk, a CD, a DVD, and an optical disk for recording the various types of data, as well as a read / write unit for reading and writing various types of data. A head (not shown) such as a writing head is provided. Further, a memory card or the like can be used for the data recording unit 16. An external storage device is constituted by the disks, memory cards, and the like.

  In the present embodiment, the data recording unit 16 is provided with the map database, statistical database, travel history database, and the like. In the information center 51, the map database, statistical database, A travel history database or the like can also be provided.

  The navigation processing unit 17 is a control device that performs overall control of the navigation device 14 and a CPU 31 as an arithmetic device, a RAM 32 that is used as a working memory when the CPU 31 performs various arithmetic processes, In addition to the program for the above, a ROM 33 in which various programs for searching for a route to the destination, route guidance, etc. are recorded, a flash memory (not shown) used for recording various data, programs, etc. Prepare. The RAM 32, ROM 33, flash memory, etc. constitute an internal storage device.

  As the operation unit 34, a keyboard, a mouse, etc. (not shown) arranged independently of the display unit 35 can be used. Further, as the operation unit 34, a predetermined input operation is performed by touching or clicking an image operation unit such as various keys, switches, and buttons displayed as images on the screen formed in the display unit 35. A touch panel (not shown) that can be used can be used.

  A display (not shown) is used as the display unit 35, and on various screens formed on the display unit 35, the current position of the vehicle is displayed as the vehicle position, the vehicle direction is displayed as the vehicle direction, a map, a search route, Guidance information, traffic information, and the like along the searched route can be displayed, and the distance to the next intersection on the searched route and the traveling direction at the next intersection can be displayed.

  The voice input unit 36 includes a microphone (not shown) and the like, and can input necessary information by voice. Further, the voice output unit 37 includes a voice synthesizer and a speaker (not shown), and the search route, guidance information, traffic information, and the like are output from the voice output unit 37 as voice synthesized by the voice synthesizer, for example. The

  The communication unit 38 is a beacon receiver for receiving various information such as current traffic information and general information transmitted from the road traffic information center, and FM reception for receiving as FM multiplex broadcast via an FM broadcast station. Equipped with machines. And the communication part 38 can receive various information, such as traffic information and general information other than data, such as the said map data, statistical data, and driving history data, from the said information center 51 via the network 63. .

  For this purpose, the information center 51 includes a server 53, a communication unit 57 connected to the server 53, a database (DB) 58 as an information recording unit, and the like. A CPU 54, a RAM 55, a ROM 56, etc. are provided as devices. In addition, data similar to various data recorded in the data recording unit 16 is recorded in the database 58.

  The navigation system, the navigation processing unit 17, the CPUs 31, 54, the server 53, and the like function as a computer alone or in combination of two or more, and perform arithmetic processing based on various programs, data, and the like. The data recording unit 16, the RAMs 32 and 55, the ROMs 33 and 56, the database 58, the flash memory, and the like constitute a recording medium. An MPU or the like can be used instead of the CPUs 31 and 54 as the arithmetic unit.

  Next, a basic operation of the navigation system having the above configuration will be described.

  First, when the operation unit 34 is operated by the driver and the navigation device 14 is activated, a navigation initialization processing unit (not shown) of the CPU 31 performs navigation initialization processing, and the current location of the vehicle detected by the GPS sensor 15, The vehicle orientation detected by the orientation sensor 18 is read and various data are initialized. Next, the matching processing means (not shown) of the CPU 31 performs matching processing, and based on the trajectory of the read current location and the shape, arrangement, etc. of each road link constituting the road around the current location, The current location is identified by determining whether it is located on the road link.

  In the present embodiment, the matching processing means further specifies the current location based on the position of each feature that is the subject to be photographed by the back camera 49.

  For this purpose, image recognition processing means (not shown) of the CPU 31 performs image recognition processing, reads image data from the back camera 49, and recognizes a feature in the image composed of the image data. A distance calculation processing unit (not shown) of the CPU 31 performs a distance calculation process, and calculates a distance from the back camera 49 to the actual feature based on the position of the feature in the image. The current location specifying processing means of the matching processing means performs current location specifying processing, reads the distance, reads the feature data from the data recording unit 16 to acquire the coordinates of the feature, the coordinates and the coordinates Identify your location based on distance.

  Further, a travel lane identification processing unit (not shown) of the CPU 31 performs a travel lane identification process, and similarly, a feature recognized based on the image data, a feature data read from the data recording unit 16, and The current location is identified by collating with the lane data, and the traveling lane in which the vehicle is traveling is identified based on the identified current location.

  The travel lane identification processing means reads the sensor output of the geomagnetic sensor, and based on the sensor output, determines whether there is an object to be detected made of a ferromagnetic material such as a manhole in a predetermined lane on the road. The traveling lane can be specified based on the determination result. Furthermore, a high-precision GPS sensor can be used to accurately detect the current location, and a traveling lane can be detected based on the detection result. Further, if necessary, it is possible to identify the traveling lane by combining the sensor output of the geomagnetic sensor, the current location, etc. simultaneously with performing image processing on the image data of the display lines.

  Subsequently, a basic information acquisition processing unit (not shown) of the CPU 31 performs a basic information acquisition process, and reads and acquires the map data from the data recording unit 16 or an information center 51 or the like via the communication unit 38. Receive from and get. In addition, when acquiring map data from the information center 51 etc., the said basic information acquisition process means downloads the received map data to flash memory.

  A display processing unit (not shown) of the CPU 31 performs display processing and forms various screens on the display unit 35. For example, the map display processing means of the display processing means performs a map display process, forms a map screen on the display unit 35, displays a surrounding map on the map screen, and sets the current position as the vehicle position and the direction of the vehicle. Is displayed as the vehicle direction.

  Accordingly, the driver can drive the vehicle according to the map, the vehicle position, and the vehicle direction.

  When the driver operates the operation unit 34 to input a destination, a destination setting processing unit (not shown) of the CPU 31 performs a destination setting process to set the destination. Note that the departure place can be input and set as necessary. Moreover, a predetermined point can be registered in advance, and the registered point can be set as a destination. Subsequently, when the driver operates the operation unit 34 to input search conditions, search condition setting processing means (not shown) of the CPU 31 performs search condition setting processing to set the search conditions.

  When the destination and the search condition are set in this way, the route search processing means (not shown) of the CPU 31 performs the route search processing, reads the current location, the destination, the search condition, and the like from the data recording unit 16. Based on the current location, the destination, the search data, etc., the route from the departure point to the destination represented by the current location is searched using the search conditions, and route data representing the searched route is output. At this time, the route with the smallest total link cost assigned to each road link is set as the searched route.

  The information center 51 can perform route search processing. In that case, the CPU 31 transmits the current location, destination, search conditions, etc. to the information center 51 via the network 63. When the information center 51 receives the current location, destination, search conditions, etc., route search processing means (not shown) of the CPU 54 performs route search processing similar to that of the CPU 31 and reads the search data from the database 58 to obtain the current location, destination. Based on the search data or the like, a route from the departure point to the destination is searched under the search conditions, and route data representing the searched route is output. Next, a transmission processing unit (not shown) of the CPU 54 performs transmission processing and transmits the route data to the navigation device 14 via the network 63.

  Subsequently, a guidance processing means (not shown) of the CPU 31 performs guidance processing and provides route guidance. For this purpose, the route display processing means of the guidance processing means performs route display processing, reads the route data, and displays the searched route on the map screen according to the route data.

  By the way, in the route guidance, when the vehicle needs to turn right or left at a predetermined intersection, the intersection is set as a guidance point and a guidance intersection. For this purpose, the guidance intersection setting processing means of the guidance processing means performs guidance intersection setting processing and determines whether there is an intersection that requires the vehicle to turn left or right according to the route data, that is, based on the searched route. If there is an intersection that requires the vehicle to turn left or right, the intersection is set as a guide intersection.

  Subsequently, the guidance point enlarged map forming processing means of the guidance processing means performs a guidance point enlarged map forming process, and before the vehicle reaches the guidance intersection, an enlarged view of the guidance intersection in a predetermined area of the map screen, that is, Then, an intersection enlarged view is formed as a guide point enlarged view, and route guidance is performed by the intersection enlarged view. For this purpose, a guide point enlarged map display point is set at a position away from the guidance intersection on the search route (current position side) by a set distance, and when the vehicle reaches the guide point enlarged map display point, The intersection enlarged view is displayed.

  In this case, a map around the guidance intersection, a search route, and a landmark such as a facility that serves as a landmark at the guidance intersection are displayed on the enlarged intersection. In addition, intersections that join or branch at junctions or the like are set as guidance intersections on toll roads dedicated to automobiles such as expressways, city expressways, and toll roads.

  In addition, when a road on which a plurality of lanes are formed is included in the searched route, the guidance processing unit performs lane guidance. Therefore, a recommended lane calculation processing unit (not shown) of the CPU 31 performs a recommended lane calculation process, reads a search route, reads intersection data, lane data, etc., and based on the search route, intersection data, lane data, etc. The recommended lane for each road on the searched route is calculated, and the lane number is acquired.

  The lane display processing means of the guidance processing means performs lane display processing, forms a lane guide map in a predetermined area of the map screen, displays each lane of the road on the lane guide map, and displays the recommended lanes. Display and guide the vehicle from the driving lane to the recommended lane.

  Further, when a plurality of lanes are formed on a road entering the guidance intersection (hereinafter referred to as “entry road”) or a road exiting from the guidance intersection (hereinafter referred to as “exit road”), the above-described guidance point enlarged view. The formation processing means displays, as the recommended lanes, lanes that are preferable for entering the guide intersection and lanes that are preferable for exiting from the guide intersection in the enlarged intersection view.

  Then, the route guidance point setting processing means of the guidance processing means performs route guidance point setting processing, and one or more of the present information is provided at a location on the searched route that is a distance from each of the set distances before the guidance intersection. In the embodiment, when a plurality of route guidance points are set and a vehicle arrives at each route guidance point, the voice output processing means of the guidance processing means performs a voice output process, and the guidance intersection is determined for each route guidance point. The route guidance having the contents set in advance is output by the voice from the voice output unit 37, that is, the guidance phrase.

  For this purpose, guidance phrases for performing lane guidance are set in advance for each combination of the driving lane and the recommended lane, for each distance from the route guidance point to the guidance intersection, and the guidance phrase map not shown in the data recording unit 16. As recorded.

  The lane guidance processing means of the guidance processing means performs lane guidance processing, reads the traveling lane from the traveling lane identification processing means, reads the recommended lane from the recommended lane calculation processing means, and guides the intersection from the current location based on the current location. And the guidance phrase corresponding to the travel lane, the recommended lane, and the distance is read out with reference to the guidance phrase map.

  Subsequently, the guidance processing means of the lane guidance processing means performs guidance processing, activates a voice synthesizer, outputs the guidance phrase with synthesized voice from the speaker of the voice output unit 37, and runs the vehicle. Guide from the lane to the recommended lane.

  In this case, the guidance phrase setting processing means of the lane guidance processing means performs guidance phrase setting processing, and calculates how many lanes the recommended lane will be from the right or left side of the road based on the lane number of the lane data. Then, the guidance phrase is set. For example, a guidance phrase is output such as “the ○ th from the right is the recommended lane”, “the ○ th from the left is the recommended lane”, and the like.

  2 is a flowchart showing the operation of the lane guidance processing means in the embodiment of the present invention, FIG. 3 is a first diagram showing an example of lane guidance in the embodiment of the present invention, and FIG. 4 is an embodiment of the present invention. FIG. 5 is a third diagram showing an example of lane guidance in the embodiment of the present invention.

  In the figure, r1 is a road, k1 to k5 are lanes, among lanes k1 to k5, in FIGS. 3 and 4, lane k3 is a recommended lane, in FIG. 5, lane k1 is a recommended lane, and in FIG. k4 is a right extension lane added on the right side of the road r1, and in FIG. 5, lane k5 is a left extension lane added on the left side of the road r1. A lane that can be reduced on the right side of the road is called a right-decreasing lane, and a lane that can be reduced on the left side of the road is called a left-decreasing lane.

  In this case, in FIG. 3, for example, when the vehicle is traveling in the lanes k1 and k2, the lane guidance processing means, for example, “the first from the right is the recommended lane”, “the rightmost is the recommended lane. The guide phrase is output as follows.

  By the way, in the present embodiment, the guidance phrase is set by calculating the number of recommended lanes from the right side or the left side of the road, so that the lane guidance is performed. Or, if the number of road lanes increases or decreases before and after the lane guidance is performed, the number of lanes on the road changes, so that the driver cannot determine which lane is the recommended lane.

  Therefore, the lane guidance is adjusted while the lane guidance is being performed or when it is assumed that the number of road lanes will increase or decrease before and after the lane guidance is performed.

  For this purpose, the adjustment section setting processing means of the lane guidance processing means is a point where the lane guidance is terminated from the lane guidance start point where the lane guidance by the guidance phrase is started by performing the adjustment section setting process. When the section up to the lane guidance end point is set as an utterance section, the utterance section is calculated, and an adjustment section is calculated and set by adding an additional section (for example, 30 [m] before and after) before and after the utterance section. .

When the utterance section is Lf, the current vehicle speed is 40 km / h, for example, and the time required to utter the guidance phrase is 3 seconds, for example,
Lf = (40 × 1000 ÷ 3600) × 3
≒ 33 [m]
Then, in consideration of the error of the current location specified in the current location specifying process, an additional section, for example, ± 30 [m] is added before and after the utterance section Lf, and 30 [m] before the lane guidance start point. To 30 [m] from the lane guidance end point to the adjustment zone Lc
Lc = 33 + 30 + 30
= 90 [m]
Calculate and set as When the error at the current location is small and can be ignored, the adjustment interval Lc can be made equal to the utterance interval Lf.

  Subsequently, the lane increase / decrease determination processing means of the lane guidance processing means performs lane increase / decrease determination processing, reads lane data, and is it assumed that lanes increase or decrease during lane guidance, that is, during guidance? It is determined whether or not the lane is increasing or decreasing. Therefore, the lane data includes nodes at road increase / decrease points, and includes which lane increases or decreases for each road link. For example, in FIG. 4, the lane data includes that the node n1 is placed at the extension point of the road r1, and the lane k4 is added to the lane k3 in the road link ahead of the node n1. In FIG. 5, the lane data includes that node n2 is placed at the extension point of road r1 and lane k5 is added to lane k1.

  That is, the lane increase / decrease determination processing means determines whether or not lane increase / decrease on the right side of the road during the guidance, that is, whether a right extension / decrease is assumed, or lane increase / decrease on the left side of the road, that is, left extension / decrease. Determine whether or not is expected. In this case, “being guided” is a section from when the vehicle enters the adjustment section Lc to when the vehicle leaves the adjustment section Lc.

  When a right extension / decrease and a left extension / decrease are assumed during the guidance, the lane guidance adjustment processing means of the lane guidance processing means performs a lane guidance adjustment process, and enters the adjustment section Lc before entering the adjustment section Lc. Either the guidance ends or the lane guidance starts after leaving the adjustment section Lc, and the section where the lane guidance is performed, that is, the guidance section is shifted and removed from the adjustment section Lc.

  Also, when a right extension / decrease is assumed during guidance, the lane guidance adjustment processing means sets a base point for counting lanes to a side where no increase / decrease is assumed, and counts the lanes from the left side of the road to provide lane guidance. Do. When a left extension / decrease is assumed during the guidance, the lane guidance adjustment processing means sets the base point for counting the lanes to the side where the increase / decrease is not performed, and performs the lane guidance by counting the lanes from the right side of the road. .

  When neither right extension / decrease nor left extension / decrease is assumed during guidance, the lane guidance adjustment processing means performs lane guidance from the smallest number when counting lanes.

  For example, in FIG. 4, a lane k4 is formed during guidance and a right extension is assumed. Therefore, the lane guidance adjustment processing unit counts the lanes from the left side of the road. ”To guide the lane by outputting a guidance phrase. Also, in FIG. 5, lane k5 is formed during guidance and left extension is assumed, so the lane guidance adjustment processing means counts the lanes from the right side of the road. For example, “third from the right is the recommended lane. ”To guide the lane by outputting a guidance phrase.

  As described above, the lane guidance is adjusted while the lane guidance is being performed, or when the road lane is assumed to increase or decrease before and after the lane guidance is performed. It does not change. Therefore, the driver can surely determine which lane is the recommended lane.

Next, a flowchart will be described.
Step S1: It is determined whether or not a right extension / decrease is assumed during guidance. If a right extension / decrease is assumed during guidance, the process proceeds to step S2, and if not expected, the process proceeds to step S5.
Step S2: It is determined whether left extension / decrease is expected during the guidance. If left extension / decrease is assumed during guidance, the process proceeds to step S3. If not expected, the process proceeds to step S4.
Step S3: Shift the guidance section and return.
Step S4 Guide the lane from the left and return.
Step S5: Determine whether left extension / decrease is expected during guidance. If left extension / decrease is assumed during guidance, the process proceeds to step S6. If not expected, the process proceeds to step S7.
Step S6 Guide the lane from the right and return.
Step S7: Guiding the lane from the side with the smallest number, and returning.

  In the present embodiment, the adjustment section Lc is calculated by distance, but can be calculated and set by time. In that case, the lane guidance is adjusted from the timing when the vehicle enters the adjustment zone Lc to the timing when the vehicle leaves the adjustment zone Lc.

  In the present embodiment, the additional section is added before and after the utterance section Lf in consideration of the current position error. However, the additional section is independently used as a margin amount different from the current position error. Or can be added together with the additional section.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

It is a figure which shows the navigation system in embodiment of this invention. It is a flowchart which shows operation | movement of the lane guidance process means in embodiment of this invention. It is a 1st figure which shows the example of the lane guidance in embodiment of this invention. It is a 2nd figure which shows the example of the lane guidance in embodiment of this invention. It is a 3rd figure which shows the example of the lane guidance in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Automatic transmission control part 14 Navigation apparatus 15 GPS sensor 31 CPU
51 Information Center 63 Network

Claims (4)

A current location detection unit that detects the current location of the vehicle as the vehicle location;
Route search processing means for searching for a search route to the destination based on the vehicle position;
Recommended lane setting processing means for setting a recommended lane recommended to travel based on the searched route;
Lane increase / decrease determination processing means for determining whether the lane is assumed to increase or decrease during the lane guidance , and the direction in which the lane increases or decreases,
A base point setting processing means for setting a base point for counting the lanes up to the recommended lane based on the direction in which the lane increases or decreases when it is assumed that the lanes increase or decrease while the lane guidance is performed ;
A route guidance system comprising guidance processing means for performing lane guidance to a recommended lane using the number of lanes counted from the set base point . The route guidance system according to claim 1, wherein the base point setting processing unit sets the base point on a side where lanes are not increased or decreased. In addition to having section calculation processing means for calculating a section necessary for performing lane guidance,
2. The route guidance system according to claim 1, wherein the lane increase / decrease determination processing unit determines whether or not a lane is assumed to increase or decrease within the calculated section and a direction in which the lane increases or decreases. Detects the current location of the vehicle as its location,
Search for a search route to the destination based on the vehicle position,
Based on the searched route, a recommended lane recommended to travel is set,
Determine whether the lanes are expected to increase or decrease during the lane guidance , and the direction in which the lanes increase or decrease ,
When the number of lanes is assumed to increase or decrease during lane guidance, a base point for counting the lanes up to the recommended lane is set based on the direction in which the lanes increase or decrease,
A route guidance method for performing lane guidance to a recommended lane using the number of lanes counted from the set base point .

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