JP2006003171A - Route guidance system and program for route guidance method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the recognition of the reliability of the estimated arrival time. <P>SOLUTION: The route guidance system comprises: the information acquisition means for acquiring the map data; the route search means for searching the route from a starting point to a destination on the basis of the actual traffic information recorded in the memory device corresponding to the map data, road links and the time; the arrival time estimation means for estimating the arrival time to the destination for the route; the information means for informing the arrival time; and the actual route index information means for informing the actual road index representing the searched route on the basis of the actual traffic information. Because the actual route index is informed, the reliability of the estimated arrival time can be recognized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

  Conventionally, in a navigation device, for example, the current position of a vehicle, that is, the current position is detected by GPS (Global Positioning System), and the direction of the vehicle, that is, based on the turning angle of the vehicle detected by a gyro sensor, that is, The vehicle direction is detected, map data is read from the data recording unit, a map screen is formed on the display unit, the vehicle position indicating the current location, a map around the vehicle position, and the vehicle The direction is displayed. Therefore, the driver who is an operator can drive the vehicle according to the own vehicle position displayed on the map screen, the map around the own vehicle position, and the own vehicle direction.

  Further, when the driver inputs a destination and sets search conditions, a route from the departure point represented by the current location to the destination is searched according to the map data based on the search conditions. The searched route, that is, the searched route is displayed together with the vehicle position on the map screen. Therefore, the driver can drive the vehicle along the displayed search route.

By the way, in the navigation device, the arrival time to the destination is predicted based on the statistical data representing the past traffic information, and the predicted arrival time is displayed on the screen (for example, patents). Reference 1).
JP 2003-344074 A

  However, in the conventional navigation device, statistical data cannot be used for all sections of the searched route from the departure point to the destination. For sections where statistical data cannot be used, the link required time, which is the required time for the road link, is calculated based on the vehicle speed set according to the road type and the link length of the road link constituting the road. The arrival time is predicted based on the required link time.

  However, in this case, the driver who is the operator cannot determine how reliable the predicted arrival time is.

  An object of the present invention is to provide a route guidance system and a route guidance method program capable of resolving the problems of the conventional navigation device and recognizing the reliability of the predicted arrival time.

  Therefore, in the route guidance system of the present invention, based on the information acquisition processing means for acquiring map data, the map data, and the actual traffic information recorded in the recording device corresponding to the road link and time, Route search processing means for searching for a route from the ground to the destination; arrival time prediction processing means for predicting arrival time at the destination on the route; arrival time notification processing means for notifying the predicted arrival time; The route includes an actual route index notification processing means for notifying an actual route index representing a route portion searched based on the actual traffic information.

  According to the present invention, the arrival time at the destination in the searched route is predicted and notified, and the route indicator indicating the route portion searched based on the actual traffic information is notified in the route. The reliability of the arrival time can be recognized.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a navigation system in an embodiment of the present invention, FIG. 2 is a diagram showing an example of a vehicle speed table in the embodiment of the present invention, and FIG. 3 is a congestion degree calculation table in the embodiment of the present invention. FIG. 4 is a diagram showing an example, and FIG. 4 is a diagram showing an example of a required link time table in the embodiment of the present invention.

  In FIG. 1, reference numeral 14 denotes an information terminal, for example, a navigation device as an in-vehicle device mounted on a vehicle. A navigation process that functions as a computer based on the data recording unit 16 as an information recording unit in which the above information is recorded, various programs, data, and the like, and performs various arithmetic processes such as a navigation process based on the input information Unit 17, direction sensor 18 serving as a direction detection unit for detecting the vehicle direction, operation unit 34 serving as a first input unit for performing predetermined input when operated by a driver as an operator, a screen (not shown) A display unit 35 as a first output unit for performing various displays according to the image displayed on the vehicle and notifying the driver. A voice input unit 36 as a second input unit for performing predetermined input by voice, a voice output unit 37 as a second output unit for performing various displays by voice and notifying the driver, a communication terminal The navigation processing unit 17 is connected with an operation unit 34, a display unit 35, a voice input unit 36, a voice output unit 37, and a communication unit 38. The navigation processor 17 is also connected with a vehicle speed sensor 41 as a vehicle speed detector.

  The GPS sensor 15 detects the current location on the earth by receiving radio waves generated by an artificial satellite, and also detects the time.

  In the present embodiment, the GPS sensor 15 is used as the current position detection unit, but a distance sensor, a steering sensor, an altimeter, etc. (not shown) may be used alone or in combination instead of the GPS sensor 15. Further, a gyro sensor, a geomagnetic sensor, or the like can be used as the direction sensor 18.

  The data recording unit 16 includes a map database including map data files, and map data is recorded in the map database. The data recording unit 16 also records data for outputting predetermined information by the audio output unit 37. The map data includes intersection data related to intersections, node data related to nodes, road data related to road links, search data processed for searching, facility data related to facilities, and the like.

  The navigation processing unit 17 includes a CPU 31 as a control device that controls the entire navigation device 14, a RAM 32 as a first recording medium used as a working memory when the CPU 31 performs various arithmetic processes, and a control device. In addition to the program, the ROM 33 as a second recording medium on which various programs for searching for a route to the destination, route guidance, etc. are recorded, various data, programs and the like used for recording 3 is provided with a flash memory (not shown) as a recording medium. Note that an MPU or the like may be used as the control device instead of the CPU 31.

  The data recording unit 16 includes a disk (not shown) such as a hard disk, a CD, a DVD, and an optical disk as a fourth recording medium for recording the various data, and reads various data. A head (not shown) such as a read / write head for writing is provided. Note that a memory card or the like can be used as the fifth recording medium in the data recording unit 16.

  By the way, various programs can be recorded in the ROM 33 and various data can be recorded in the data recording unit 16, but the programs, data, and the like can also be recorded on a hard disk or the like. In this case, the program, data, etc. can be read from a hard disk or the like and written to the flash memory. Therefore, the program, data, etc. can be updated by exchanging the hard disk or the like. Further, when an automatic transmission control device is mounted to control an automatic transmission (not shown) mounted on the vehicle, the control program and data for the automatic transmission control device are also stored in the hard disk or the like. Can be recorded. Further, the program, data, etc. can be received via the communication unit 38 and written to the flash memory.

  The operation unit 34 is operated by the driver to correct the current location at the start of traveling, to input a departure point and a destination, to input a passing point, and to activate the communication unit 38. It is possible to use a keyboard, a mouse, etc. that are arranged independently of the display unit 35. 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. It is possible to use a touch panel that can be used.

  A display can be used as the display unit 35. Then, on various screens formed on the display unit 35, the vehicle position indicating the current location, a map, a searched route, guidance information along the searched route, traffic information, etc. are displayed, or until the next intersection in the searched route. In addition to displaying the distance and the direction of travel at the next intersection, the operation guidance, operation menu, and key guidance of the image operation unit, operation unit 34, voice input unit 36, etc. can be displayed. A multiplex broadcast program or the like 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, for example, as voice synthesized by the voice synthesizer. .

  The communication unit 38 is arranged along the road with various types of information transmitted from a road traffic information center (not shown) such as a VICS (registered trademark) vehicle center as a first information provider. A beacon receiver for receiving as a radio beacon, an optical beacon or the like via a radio beacon device or an optical beacon device, an FM receiver for receiving as an FM multiplex broadcast via an FM broadcast station, or the like. And, the beacon receiver receives traffic information such as traffic jam information, regulation information, parking lot information, traffic accident information, service area congestion status information, etc. In addition to the traffic information, news, General information such as weather forecasts can be received as FM multiplexed information. The beacon receiver and the FM receiver are unitized and arranged as a VICS receiver, but can be arranged separately. The traffic jam information includes a distance from the head to the tail of the traffic jam, a traffic jam level for each road link constituting each road, a link required time which is a required time for each road link, and the like.

  The communication unit 38 can also receive various information such as traffic information and general information from the information center 51 as the second information provider. For this purpose, the communication unit 38 and the information center 51 are connected via a network 43.

  The navigation device 14, the road traffic information center, the information center 51, the network 43 and the like constitute a navigation system, and various types of information are transmitted and received between the communication unit 38 and the communication unit 57 of the information center 51.

  The network 43 may be a LAN (Local Area Network), a WAN (Wide Area Network), a communication line network such as the Internet, or the like.

  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. The server 53 includes a CPU 54, a RAM 55, an arithmetic device and a control device, A ROM 56 is provided, and functions as a computer based on predetermined programs, data, and the like. In addition, the same data as various data recorded in the data recording unit 16 can be recorded in the database 58. The server 53 and the navigation processing unit 17 can also constitute a computer. Further, an MPU or the like can be used instead of the CPU 54.

  By the way, in the present embodiment, in addition to the map database, a statistical database composed of statistical data files, a travel history database composed of travel history data files, and the like are formed in the data recording unit 16. Statistical data as first actual traffic information is recorded as travel history data as second actual traffic information in the travel history data file.

  The statistical data is a history of traffic information such as traffic jam information provided in the past, that is, history information representing a history, traffic information provided by the road traffic information center, etc., and provided by the Ministry of Land, Infrastructure, Transport and Tourism. It is created by combining, processing, and performing statistical processing on data representing the traffic volume by road traffic census (hereinafter referred to as “road traffic census information”).

  In addition to the traffic information provided by the road traffic information center and the road traffic census information, the statistical data includes road timetable information provided by the Ministry of Land, Infrastructure, Transport and Tourism as required, and an information center 51. Can be created by combining and processing probe data, which is travel history data collected from a plurality of vehicles, and performing statistical processing.

  In the statistical data, it is possible to add traffic jam prediction information for predicting a traffic jam status to the history information. In that case, in creating the statistical data, detailed conditions such as date and time, day of the week, weather, various events, seasons, facility information (presence / absence of large facilities such as department stores and supermarkets) are added to the history information.

  The data items of the statistical data include the route on which the vehicle has traveled in the past, that is, the link number data (ID) for each road link Li (i = 1, 2,..., N) constituting each travel route, the travel direction. Direction flag, information type indicating traffic information provided by the road traffic information center or the like, or road traffic census information, every predetermined timing t, in this embodiment, 15 [minutes] Is a traffic jam degree KJi (t) (i = 1, 2,..., N) representing the degree of traffic jam every time. In this embodiment, the degree of traffic congestion KJi (t) is used as a traffic congestion index indicating the degree of traffic congestion, and is expressed separately for traffic congestion, congestion, and non-congestion, and is formed corresponding to the road link Li and time. It is recorded in the statistical database as a traffic congestion degree table (not shown) comprising a matrix. In the statistical database, when the traffic congestion degree KJi (t) is calculated, the vehicle speed Kvi (t) (i = 1, 2,..., N) is calculated based on the road type for each road link Li. A vehicle speed table as shown in FIG. In the present embodiment, the time in the matrix is represented by an instantaneous time such as 8:00, 8:15,..., But 8: 0 to 8:15, 8: It can also be expressed in a time zone such as 15-8: 30,. In the present embodiment, the road type includes an expressway, an urban expressway, and a general road.

  In addition, the travel history data is calculated and accumulated based on the travel record of the vehicle, that is, data (travel data) representing the travel record on the travel route. The data item of the travel history data is a link required time that represents a required time every 15 [minutes] in a predetermined cycle when the vehicle travels on each road link Li constituting the travel route. STi (t) (i = 1, 2,..., N), the degree of congestion at every predetermined timing t when traveling on each road link Li, and every 15 minutes in this embodiment. SJi (t) (i = 1, 2,..., N), etc., and the link required time STi (t) includes the road link Li and the reference time (hereinafter referred to as “reference time”) as shown in FIG. Is recorded in the travel history database as a link required time table composed of a matrix formed corresponding to a certain time. The congestion degree SJi (t) is calculated with reference to the congestion degree calculation table shown in FIG. 3, and similarly, a congestion degree table (not shown) composed of a matrix formed corresponding to the road link Li and time. Recorded in the travel history database.

  The link required time STi (t) is calculated on the basis of the past plural times, in the present embodiment, a maximum of five driving results, and is accumulated for each road link Li. When the number of required times is 1, the link required time STi (t) is not calculated.

  When the number of required times accumulated for each road link Li is 2, in addition to the two required times τ1 and τ2, it is calculated based on the congestion degree KJi (t) of the statistical data. The link required time STi (t) is calculated based on the estimated required time τ3.

  For this purpose, first, the road type for each road link Li is read, and then the congestion degree KJi (t) for each road link Li is read with reference to the congestion degree table of the statistical database. Subsequently, with reference to a vehicle speed table having the same contents as the vehicle speed table shown in FIG. 2, the vehicle speed Kvi (t) corresponding to the road type and the degree of congestion KJi (t) is calculated, and the link length of each road link Li and The required time τ3 can be calculated based on the vehicle speed Kvi (t). When the required times τ1 to τ3 are calculated in this way, the median value of the required times τ1 to τ3 is set as the link required time STi (t). In addition, although the link length of each road link Li can be read from road data, it can also have as a data structure of driving history data.

  Further, when the number of required times accumulated for each road link Li is 3 or more, the median value of the required times τ1, τ2,... Is set as the link required time STi (t). Then, the vehicle speed Svi (t) (i = 1, 2,..., N) is calculated based on the link length of each road link Li and the link required time STi (t), and then, for each road link Li. The traffic congestion degree SJi (t) corresponding to the road type and the vehicle speed Svi (t) can be calculated by reading the road type and referring to FIG.

  In the present embodiment, the map database, the travel history database, the statistical database, and the like are arranged in the data recording unit 16, but in the information center 51, the map database, the travel history A database, a statistical database, etc. can also be provided.

  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 and direction detected by the GPS sensor 15. While reading the direction of the vehicle detected by the sensor 18, various data are initialized. 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 and arrangement of each road link Li constituting the surrounding road, the current location is any road link. The current location is identified by determining whether it is located on Li.

  Subsequently, an information acquisition processing unit (not shown) of the CPU 31 performs an information acquisition process and reads and acquires the map data from the data recording unit 16 or receives and acquires it from the information center 51 or the like via the communication unit 38. To do. When acquiring from the information center 51, the information acquisition processing means downloads the received navigation data to the flash memory. In addition, when the navigation data is acquired via the communication unit 38, the program can also be acquired.

  The display processing means (not shown) of the CPU 31 performs display processing, forms a map screen on the display unit 35, and displays the vehicle position, a map around the vehicle position, and the vehicle direction on the map screen. . Therefore, the driver can drive the vehicle according to the vehicle position, the map around the vehicle position, and the vehicle direction.

  The navigation device 14 can receive traffic information, general information, and the like via the communication unit 38. For this purpose, the additional information acquisition processing means of the information acquisition processing means performs additional information acquisition processing, and receives and acquires the traffic information, general information, and the like as additional information. Therefore, the display processing means displays additional information on the map screen.

  The traffic information specifies information type data indicating the type of information, secondary mesh X and Y data for specifying a secondary mesh as a mesh, and a road link connecting two points (for example, intersections). And link number data representing the uplink / downlink and link information representing the content of information provided corresponding to the link number data. The link information includes, for example, a traffic jam from the start point of the road link. Consists of traffic jam head data representing the distance to the head, traffic jam degree data representing the degree of traffic jam, traffic jam length data representing a traffic jam section from the head of the traffic jam to the end of the traffic jam, and the like.

  Therefore, the display processing means converts each link information in the traffic information into, for example, a traffic congestion arrow as a traffic condition index indicating a traffic congestion index indicating whether the traffic is congested or not. A traffic jam arrow is displayed along the road on the map screen. In this case, the color of the road, the traffic jam arrow, etc. is changed to red, orange, etc. according to the degree of traffic jam.

  In this manner, the driver can know the traffic jam situation on the route on which the vehicle is to travel, the searched route, and the like.

  Next, the operation of the route guidance system when the navigation device 14 or the navigation system is used for guiding a route will be described.

  FIG. 5 is a first diagram illustrating a method for calculating the total required time according to the embodiment of the present invention. FIG. 6 is a second diagram illustrating a method for calculating the total required time according to the embodiment of the present invention. Is a diagram showing an example of a candidate route display screen in the embodiment of the present invention, FIG. 8 is a diagram showing an example of a specific candidate route display screen in the embodiment of the present invention, and FIG. 9 is a content in the embodiment of the present invention It is a flowchart showing operation | movement of a rate notification process means.

  When the driver inputs a destination by operating the operation unit 34 (FIG. 1), 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 input as a destination.

  When the destination is set, the route search processing means (not shown) of the CPU 31 performs route search processing, reads map data, current location, destination, etc., and based on the current location, destination and map data, Search for the route from the starting point to the destination.

  For this purpose, the candidate route calculation processing means of the route search processing means performs candidate route calculation processing, searches a plurality of, in this embodiment, five routes according to predetermined search conditions, and each search route. Is a candidate route Rtj (j = 1, 2,..., 5) for each search condition. In the present embodiment, each candidate route Rtj is given priority on a “recommended” candidate route and a toll road that are searched with priority given to the one with the smallest sum of link costs assigned to each road link Li. “Pay priority” candidate route searched, “General priority” candidate route searched with priority on general roads, “Distance priority” candidate route searched with priority on the short distance of the entire journey, In addition, based on preset conditions, for example, “other route” candidate routes searched with priority given to the one having the next smallest sum of link costs.

  Next, a method for calculating each candidate route Rtj will be described.

  The selection route calculation processing means of the candidate route calculation processing means performs a selection route calculation process and calculates a candidate route Rt1, first, a plurality of search conditions corresponding to the candidate route Rt1 from a departure point to a destination. For example, assume that three routes are selected routes rg (g = 1 to 3).

  To that end, each road link Li that constitutes a road is prohibited from turning right or left depending on the type of road, such as an expressway of the toll road, an urban expressway, or a national road, a main local road, or a prefectural road of the general road, Various link costs are set in advance depending on the presence or absence of traffic restrictions such as one-way traffic and the size of the link length indicating the length of each road link Li. In the route search processing, roads other than the narrow streets among the roads represented by the road data constituting the map data are subject to the route search, and the link cost is set. Is not subject to route search and no link cost is set.

  The total travel distance calculation processing means of the selected route calculation processing means performs total travel distance calculation processing, and link lengths ρm (m = 1, m) of all road links Lm constituting the selected route rg among the road links Li. 2,..., M) are totaled, and the total stroke distance Σρg (g = 1 to 3) is calculated.

  Subsequently, the total required time calculation processing means of the selected route calculation processing means performs the total required time calculation processing, and each road constituting each selected route rg when the vehicle is driven along each selected route rg. The link required times STi (t) corresponding to the links Lmk (k = 1, 2,..., K) are totaled to calculate the total required time ΣTg (g = 1 to 3).

  Next, the total required time calculation process will be described.

  In FIG. 5, rg is the selected route, Pr is the current location, G is the destination, nd1 to nd7 are nodes on the candidate route Rtj, Lm1 to Lm8 are road links on the selected route rg, and the road links Lm1 to Lm8 are The current location Pr, the nodes nd1 to nd7, and the destination G are connected.

  By the way, among the roads targeted for route search and route guidance, the past traffic information provided by the road traffic information center or the like, and the roads targeted for the road traffic census information, Data can be used, and the travel history data in the travel history database can be used for a road that has a track record of two or more of the roads.

  Therefore, in the present embodiment, among the roads subject to route search and route guidance, a road that cannot use any of statistical data and travel history data is defined as a navigation standard road, and statistical data and A road that can use at least the travel history data in the travel history data is referred to as a travel history use road, and a road that can use only the statistical data and the statistical data in the travel history data is referred to as a statistical use road.

  Then, in calculating the total required time ΣTg, the total required time calculation processing means calculates the link required time Nm based on the fixed vehicle speed and link length for each road link Lm for the navigation standard road section. (M = 1, 2,..., M) is calculated, and the link required time Nm is used. The total required time calculation processing means reads and uses the link required time STi (t) recorded in the travel history database for the section of the travel history utilization road. Further, the total required time calculation processing means reads the congestion degree KJi (t) with reference to the congestion degree table recorded in the statistics database for the section of the statistical use road, and refers to the vehicle speed table of FIG. The vehicle speed Kvi (t) is read out, and then the required link time KTi (t) (i = 1, 2,..., N) is calculated based on the link length ρm of each road link Lm and the vehicle speed Kvi (t). And use it.

  In addition, since the communication unit 38 constantly acquires the current traffic information transmitted from the road traffic information center, the communication unit 38 is traveling on a road where the current traffic information transmitted from the road traffic information center can be used. In this case, link required time VTi (i = 1, 2,..., N) in the current traffic information is used as the third actual traffic information.

  For example, in the case of the selected route rg as shown in FIG. 5, the link required time Nm for the road links Lm1 and Lm8, the link required time STi (t) for the road links Lm2 to Lm4, and the road link For the section from Lm5 to Lm7, the link required time KTi (t) is used, and the total required time ΣTg is calculated by adding each link required time.

  By the way, the link required times STi (t) and KTi (t) are both recorded in a cycle of 15 [minutes], so that the total required time calculation processing means calculates the total required time ΣTg. In calculating the time, a time slice process is performed.

  In FIG. 6, rg is the selected route, Pr is the current location, G is the destination, L1 to L7, LN are road links, and n1 to n6 are nodes.

  That is, the arrival time prediction processing means of the total required time calculation processing means performs arrival time prediction processing, and the link required time STi (t), KTi for each road link L2, L5, L8, L7 on the selected route rg. (T) is read, and the time at which the vehicle arrives at each of the nodes n2, n4, n6 and the destination G is predicted based on the link required times STi (t), KTi (t), and the predicted time The link required times STi (t) and KTi (t) are read for the road links L5, L8, and L7 ahead of the nodes n2, n4, and n6.

  For example, when calculating the total required time ΣTg using the link required time STi (t), as shown in FIG. 6, when leaving the current location Pr toward the destination G at 8:00, The total required time calculation processing means reads the link required time STi (t) at the reference time 8:00 referring to the link required time table of FIG. In the link required time STi (t) at the reference time 8:00, the link required time required to travel on the link L2 is 20 [minutes], so the total required time calculation processing means arrives at the node n2. The time is predicted to be 8:20.

  Subsequently, the total required time calculation processing means calculates the link required time required to travel on the road link L5 ahead of the node n2, and is the time at which it arrives at the node n2 in the link required time table. : 20, the link required time STi (t) is not recorded. Therefore, the total required time calculation processing means reads the link required time STi (t) at the reference time 8:15 immediately before the time of arrival at the node n2. At the required link time STi (t) at the reference time 8:15, the required link time required to travel the link L5 is 10 [minutes], so the total required time calculation processing means arrives at the node n4. The time is predicted to be 8:30.

  Similarly, the total required time calculation processing means predicts that the time to arrive at the node n6 is 8:36 based on the link required time STi (t) at the reference time 8:30, and reaches the destination G. The arrival time is predicted to be 8:44.

  Subsequently, the total required time calculation processing means calculates 44 [minutes] of the total required time ΣTg by subtracting the departure time from the time of arrival at the destination G. As described above, when traveling on a road where the current traffic information can be used, the link required time of the current traffic information is used instead of the link required time STi (t) of the reference time. VTi is used.

  Next, the candidate route determination processing means of the candidate route calculation processing means performs candidate route determination processing, and determines the shortest total required time ΣTg as the candidate route Rt1 from among the selected routes rg. Subsequently, the processing described above is repeated for each candidate route Rt2 to Rt5.

  Next, candidate route display processing means (not shown) of the CPU 31 performs candidate route display processing, forms a candidate route display screen as shown in FIG. 7 on the display unit 35, and displays a wide area on the candidate route display screen. And the current location Pr, destination G, candidate route Rtj, and the like are displayed.

  In FIG. 7, Rtx is a predetermined candidate route of the candidate route Rtj, for example, a candidate route of “another route”, and Rty is another predetermined candidate route of the candidate route Rtj, for example, “recommended”. The candidate routes Rtx and Rty are highlighted with respect to other roads. When a predetermined candidate route among the candidate routes Rtj matches, it is displayed as a common candidate route.

  The candidate route display screen includes an area AR1 for displaying a map orientation and scale, a key k1 for returning to the previous screen, a key k2 for displaying a detailed map, and the entire process. In order to select a predetermined candidate route among the candidate routes Rtj in addition to the key k3 for displaying a list of all strokes, the key k4 for displaying a wide area map, etc. Buttons b1 to b5 and the like are displayed. The keys k1 to k4 constitute a first operation element, and the buttons b1 to b5 constitute a second operation element for selecting a candidate route.

  Further, on the candidate route display screen, the driver selects and specifies a predetermined candidate route based on a passing point of each candidate route Rtj, an emphasis display on the traffic route, etc., and presses the corresponding buttons b1 to b5. Then, the specific candidate route display processing means (not shown) of the CPU 31 performs the specific candidate route display processing, forms a specific candidate route display screen as shown in FIG. 8 on the display unit 35, and displays the specific candidate route display screen on the specific candidate route display screen. A candidate route corresponding to the pressed button is displayed as a specific candidate route Rtz.

  The specific candidate route display screen includes an area AR1 for displaying the map orientation and scale, and a clock for indicating the arrival time at the destination G when traveling on the specific candidate route Rtz. An area AR2 to be displayed is formed, a key k1 for returning to the previous screen, a key k2 for displaying a detailed map, a key k4 for displaying a wide area map, and all five candidate routes (5 routes) Key k5 for displaying, key k6 for changing route, key k7 for starting route guidance, key k8 for displaying information about the specific candidate route Rtz, for specifying a passing road Key k9 etc. is displayed. In this case, an operation element is constituted by the keys k1, k2, and k4 to k9.

  The arrival time notification processing means of the specific candidate route display processing means performs arrival time notification processing and displays the clock on the specific candidate route display screen, thereby obtaining the predicted arrival time to the destination G. Notify the driver.

  By the way, in the searched route from the departure point Pr to the destination G, in FIG. 8, the past traffic information or the like cannot be used for all sections of the specific candidate route Rtz.

  That is, as described above, the link required time STi (t) is used for the section of the travel history using road, the link required time KTi (t) is used for the section of the statistical use road, and the current traffic information is used. The link required time VTi is used, but the link required time Nm is used for the section of the navigation standard road.

Therefore, an area AR3 is formed on the specific candidate route display screen so that the reliability of the predicted arrival time can be recognized, and the name and total distance of the roads constituting the specific candidate route Rtz are included in the area AR3. In addition to being displayed, a distance Lx (actual product data portion) as a first actual route index representing a route portion (hereinafter referred to as “actual traffic information portion”) searched based on the travel history data and statistical data. The content rate ε as a second performance route index that is displayed and further represents the ratio of the distance Lx to the total stroke distance Σρj
ε = Lx × 100 / Σρj [%]
Is displayed.

For this purpose, the first actual route index calculation processing unit and the actual route distance calculation processing unit of the specific candidate route display processing unit perform the first actual route index calculation process and the actual route distance calculation process, and the specific candidate route Rtz. , The link length of the road link Li in the section of the travel history using road, and the link length of the road link Li in the section of the statistical use road are read, and the travel representing the total value of the link length of the road link Li in the section of the travel history using road A statistical usage distance KLx that represents the total value of the link lengths of the road links Li in the section of the historical usage road SLx and the statistical usage road is calculated, and the travel historical usage distance SLx and the statistical usage distance KLx are added together to calculate the distance Lx
Lx = SLx + KLx
Is calculated.

  Subsequently, the second actual route index calculation processing unit and the content rate calculation processing unit of the specific candidate route display processing unit perform the second actual route index calculation process and the content rate calculation process, and read the total stroke distance Σρj, The content rate ε is calculated by dividing the distance Lx by the total stroke distance Σρj.

  The actual route index notification processing means of the specific candidate route display processing means displays the distance Lx and the content ratio ε on a predetermined screen, in the present embodiment, on the specific candidate route display screen, to the driver. Notice. In the present embodiment, the content rate ε is expressed as a percentage. Therefore, by changing the color of the strip-shaped bar by a length corresponding to the content rate ε in the area AR3, the content rate ε is displayed as an image. Can be represented.

  Thus, the operator can recognize the proportion of the section in which the vehicle can travel according to the statistical data and the travel history data in the entire specific candidate route Rtz by the content rate ε. It is possible to know how accurate the predicted arrival time to G is.

  Therefore, the reliability of the predicted arrival time can be recognized. Moreover, since the content rate ε is represented by an image, the reliability of the predicted arrival time can be visually recognized.

  In the present embodiment, the content rate ε is displayed as an image, but it can be expressed as a digital number or output as a voice.

Next, a flowchart will be described.
Step S1: The content rate ε is calculated.
Step S2: It is determined whether the content rate ε is 0 [%]. If the content ε is 0 [%], the process is terminated, and if it is not 0 [%], the process proceeds to step S3.
Step S3: The content rate ε is displayed and the process is terminated.

  In the present embodiment, the actual traffic information portion is searched based on the statistical data and the travel history data. However, the actual traffic information portion is at least one of the statistical data, the travel history data, and the current traffic information. You can also search based on one.

  In the present embodiment, the content ratio ε is calculated by dividing the distance Lx obtained by adding the travel history use distance SLx and the statistical use distance KLx by the total stroke distance Σρj. Only the history usage distance SLx can be calculated by dividing by the total stroke distance Σρj. In this case, the content rate ε represents how many roads that have traveled in the past, that is, how many roads that are known are included in the candidate route, so the driver includes how many roads that are known in the candidate route. Can recognize. Further, the content ratio ε can be calculated by dividing only the statistical use distance KLx by the total stroke distance Σρj. In this case, the content rate ε represents how much roads for which traffic information has been provided in the past are included in the candidate route, so the driver may have been provided with past traffic information in the candidate route. You can recognize how many roads are included. Further, the content rate ε is divided by the total travel distance Σρj by dividing the value obtained by adding the travel history usage distance SLx, the statistical usage distance KLx, and the distance of the road traveling using the current traffic information, to obtain the content rate ε. It is also possible to calculate the content rate ε by dividing only the distance of the road traveling using the current traffic information by the total travel distance Σρj.

  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 block diagram which shows the navigation system in embodiment of this invention. It is a figure which shows the example of the vehicle speed table in embodiment of this invention. It is a figure which shows the example of the congestion degree calculation table | surface in embodiment of this invention. It is a figure which shows the example of the link required time table in embodiment of this invention. It is a 1st figure explaining the calculation method of the total required time in embodiment of this invention. It is a 2nd figure explaining the calculation method of the total required time in embodiment of this invention. It is a figure which shows the example of the candidate path | route display screen in embodiment of this invention. It is a figure which shows the example of the specific candidate path | route display screen in embodiment of this invention. It is a flowchart showing operation | movement of the content rate notification process means in embodiment of this invention.

Explanation of symbols

14 Navigation device 17 Navigation processor 31 CPU
43 Network 51 Information Center 53 Server G Destination Pr Origin

Claims (6)

  Information acquisition processing means for acquiring map data, and route search for searching for a route from the departure point to the destination based on the map data and the actual traffic information recorded in the recording device corresponding to the road link and time Processing means, arrival time prediction processing means for predicting arrival time at the destination on the route, arrival time notification processing means for notifying the predicted arrival time, and searching for the route based on the actual traffic information. A route guidance system, comprising: an actual route index notification processing means for notifying an actual route index representing a route portion.   2. The route guidance system according to claim 1, wherein the actual traffic information includes at least one of statistical data that represents past traffic information, travel history data that represents vehicle travel results, and current traffic information. .   The route guidance system according to claim 1, wherein the result route index notification processing means displays the result route indicator on a predetermined screen.   The route guidance system according to any one of claims 1 to 3, wherein the actual route index is a content ratio that represents a ratio of a distance of a route portion searched based on actual traffic information to a total distance of the route.   The route guidance system according to any one of claims 1 to 3, wherein the actual route index is a distance of a route portion searched based on actual traffic information. The computer searches for a route from the departure point to the destination based on the information acquisition processing means for acquiring the map data, the map data, and the actual traffic information recorded in the recording device corresponding to the road link and time. The route search processing means, the arrival time prediction processing means for predicting the arrival time at the destination on the route, the arrival time notification processing means for notifying the predicted arrival time, and the route is searched based on the actual traffic information. A route guidance method program that functions as a performance route index notification processing means for notifying a performance route index that represents a route portion.

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