JP2005283291A - Route guide system, and program for route guide method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain a route deviation from being generated. <P>SOLUTION: This route guide system has a present point detecting part, a route search processing means for searching a route to serve as a searched route, a route deviation determining processing means for judging whether the route deviation is generated or not, a route information recording means for recording route information as to a route deviated point for expressing a route deviation generated point, when the route deviation is generated, and a notification processing means for judging whether a vehicle approaches the route deviation point or not after recording the route information, and for notifying the route deviation generated in the route deviation point to a driver, based on the route information, when approaching the route deviation point. The route deviation is thereby precluded from being generated repeatedly in the same intersection. <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, a current position of a vehicle, that is, a current position, is detected by GPS (Global Positioning System), and a rotation angular velocity of a vehicle detected by a gyro sensor, that is, based on a turning angle, The direction of the vehicle, 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, and the vehicle position indicating the current location on the map screen, the vicinity of the vehicle position The map and the vehicle direction are displayed. Therefore, the driver who is an operator can drive the vehicle according to the vehicle position displayed on the map screen, the map around the vehicle position, and the vehicle direction.

  Further, when the driver inputs a destination and sets search conditions, a route from the departure point to the destination represented by the current location is searched 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.

  In the navigation device, when the vehicle is traveling along the searched route, if there is an intersection whose course is to be changed within a predetermined distance from the current location, that is, a guidance intersection, the map screen An enlarged intersection map is formed in a part of the area, and an enlarged map around the guidance intersection is displayed on the enlarged map.

  FIG. 2 is a diagram showing an example of a conventional intersection enlarged view.

  In the figure, CR1 is a guidance intersection, Rt1 is a search route, and the search route Rt1 is an entry route u1 representing a road for entering the guidance intersection CR1 and an exit representing a road for exiting from the guidance intersection CR1. Consists of road w1. As shown in the figure, when the guidance intersection CR1 is a Y-shaped road, one exit path w2 is connected to the guidance intersection CR1 in addition to the exit path w1.

  By the way, in the navigation device having the above-described configuration, when the driver is not familiar with the guidance intersection CR1, or when the prospect at the guidance intersection CR1 is poor, the exit route w1 should be exited according to the searched route Rt1. The route w2 may be exited, and the current location may leave the searched route Rt1 and cause off-route.

  In addition, at intersections other than the guidance intersection CR1, similarly, when the driver is not familiar with the intersection or the line of sight at the intersection is poor, an off-route may occur.

Therefore, when a route deviation occurs, a preliminary route searched in advance is guided (see, for example, Patent Document 1).
JP 2003-344077 A

  However, in the conventional navigation device, when the frequency of traveling the vehicle along the searched route Rt1 is low, the vehicle repeatedly repeats off-route at the same intersection, and the vehicle is moved along the spare route each time. Since it will run, time until it reaches a destination will become long.

  It is an object of the present invention to provide a route guidance system and a route guidance method program capable of solving the problems of the conventional navigation device and suppressing the occurrence of a deviation from the route.

  For this purpose, in the route guidance system of the present invention, a current location detection unit for detecting the current location, route search processing means for searching for a route from the departure location to the destination and making the search route, and the current location is separated from the search route. And a route information recording processing unit for recording route information about the off-route point indicating a point where the route off occurred when the route off occurs. After the route information is recorded, it is determined whether or not the vehicle has approached the off-route point. When the vehicle approaches the off-route point, the driver generates the off-route point based on the route information. Notification processing means for notifying about the off-route.

  In another route guidance system according to the present invention, there is further provided a route miss determination processing means for determining whether or not the route failure is a route mistake due to a driver's mistake when the route departure occurs.

  The route information recording processing means records route information about the route miss when the route miss is a route miss.

  In still another route guidance system of the present invention, the route miss determination processing means determines that the route miss is a route miss when the current location returns to the searched route after the route miss occurs.

  In still another route guidance system according to the present invention, the route miss determination processing means determines that the route miss is a route miss when the vehicle makes a U-turn after the route miss occurs.

  In still another route guidance system of the present invention, the route information further includes guidance links before and after the off-route point.

  Then, the notification processing means performs the notification when the current guide link matches the recorded guide link.

  In still another route guidance system of the present invention, the route information further includes a traveling direction in the guide link at the off-route point.

  The notification processing means performs the notification when the traveling direction of the current guidance link matches the traveling direction of the recorded guidance link.

  In the route guidance method program of the present invention, the computer searches the route from the departure point to the destination to make a route to be searched, and the current location detected by the current location detector is routed away from the searched route. Route information processing means for determining whether or not a departure has occurred, a route information recording processing means for recording route information about a departure point indicating a point where a route departure has occurred when the route departure occurs, and After the route information is recorded, it is determined whether or not the vehicle has approached the off-route point, and when the vehicle approaches the off-route point, the off-route occurred at the off-route point to the driver based on the route information. It is made to function as a notification processing means for making a notification about.

  According to the present invention, based on the route information, the driver is notified of the out-of-route occurring at the out-of-route point, so even if the frequency of driving the vehicle along the searched route is low, It is possible to suppress repeated off-route occurrence at the same intersection.

  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 according to an embodiment of the present invention.

  In the figure, reference numeral 14 denotes an information terminal, for example, a navigation device as an in-vehicle device mounted on a vehicle. The navigation device 14 is a GPS sensor 15 as a current location detection unit for detecting the current location, map data, road data, search. It functions as a computer based on basic information of the navigation device 14 such as data, that is, a data recording unit 16 as an information recording unit in which various information is recorded in addition to navigation data, various programs, data, etc. Based on the input information, a navigation processing unit 17 that performs various arithmetic processing such as navigation processing, a direction sensor 18 as a direction detection unit that detects the direction of the host vehicle, and a predetermined driver's operation by a driver. Is displayed on a screen (not shown) as a first input unit for inputting Various displays by images, a display unit 35 as a first output unit for notifying the driver, a voice input unit 36 as a second input unit for performing predetermined input by voice, and various by voice Is provided with a voice output unit 37 as a second output unit for notifying the driver, and a communication unit 38 as a transmission / reception unit functioning as a communication terminal. A display unit 35, an audio input unit 36, an audio output unit 37, and a communication unit 38 are connected. The navigation processing unit 17 is also connected to a vehicle speed sensor 41 as a vehicle speed detection unit, and the vehicle speed detected by the vehicle speed sensor 41 is sent to the navigation processing unit 17.

  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. The distance sensor detects a distance between predetermined points on the road, and calculates a distance based on a rotational speed of a wheel (not shown) or by integrating acceleration twice. The steering sensor detects a rudder angle, and uses, for example, an optical rotation sensor, a rotation resistance sensor, an angle sensor attached to a wheel, or the like attached to a rotating portion of a steering wheel (not shown). can do.

  Further, a gyro sensor, a geomagnetic sensor, or the like can be used as the direction sensor 18. As the gyro sensor, for example, a gas rate gyro, a vibration gyro, or the like is used, and the vehicle direction is detected by integrating the turning angle. The geomagnetic sensor detects the direction of the vehicle by measuring the geomagnetism.

  The data recording unit 16 includes a database including data files such as a map data file, an intersection data file, a node data file, a road data file, a search data file, and a facility data file, and each data file includes the navigation data. To be recorded. The data recording unit 16 also records data for outputting predetermined information by the audio output unit 37.

  For example, the map data file contains map data for displaying a map, the intersection data file contains intersection data related to each intersection, the node data file contains node data related to node points, and the road data file contains road data related to roads. The search data file includes search data for searching for a route, and the facility data file stores facility data relating to various facilities, and roads representing road conditions by the intersection data, node data, road data, etc. Status data is constructed.

  The intersection data includes the name of the intersection, the shape of the intersection, the main facility adjacent to the intersection, the name of the main place ahead of the intersection, the distance between the intersections at the continuous intersection, the approach road representing the road to enter the intersection, the intersection Data indicating an exit road or the like representing a road for exiting from the road is included. In addition, the node data includes data representing an actual road branch point (including an intersection, a T-junction, and the like), a node point, a link between node points that connect the node points, and the like.

  The road data includes the width, slope, cant, bank, road surface condition, number of road lanes, places where the number of lanes decreases, places where the width becomes narrow, etc. , Radius of curvature, intersection, T-junction, corner entrance, etc., road attributes, downhill roads, uphill roads, etc. Data representing expressways and toll roads such as roads and toll roads are included. Further, the road data includes data indicating level crossings, highway entrance and exit roads (rampways), highway / toll road tollgates, and the like. The facility data includes data representing names, addresses, telephone numbers, facility guidance, etc. for facilities such as hotels, gas stations, parking lots, sightseeing spots, and department stores in each region.

  The navigation processing unit 17 includes an arithmetic device that controls the entire navigation device 14 and a CPU 31 as a control device, and a DRAM as a first recording medium used as a working memory when the CPU 31 performs various arithmetic processes. In addition to the RAM 32 such as SRAM, MRAM, and FeRAM, a control program, a ROM 33 as a second recording medium on which various programs for searching a route to the destination, route guidance, and the like are recorded, A flash memory (not shown) is provided as a third recording medium used for recording data, programs, and the like. A semiconductor memory, a magnetic core, or the like is used as a storage device such as the RAM 32, the ROM 33, or a flash memory.

  An MPU or the like can be used instead of the CPU 31 as the arithmetic device and the control device.

  The data recording unit 16 includes a magnetic disk (not shown) such as a hard disk or a flexible disk as a fourth recording medium arranged as a storage device for recording the various data. A head (not shown) such as a read / write head for reading and writing data is provided. Similarly, the data recording unit 16 includes a magnetic tape, a magnetic drum, a CD, an MD, a DVD, an optical disk, an MO, an IC card, an optical card, and the like as a fifth recording medium that is also provided as a storage device. You can also.

  By the way, in the present embodiment, 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 are recorded on a hard disk or the like. You can also In this case, the program, data, etc. can be read from the 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. A keyboard, a mouse, a barcode reader, a light pen, a remote control device for remote control, a joystick, etc., which are 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. Can do.

  As the display unit 35, a display such as a CRT display, a liquid crystal display, or a plasma display can be used, or a hologram device that projects a hologram on a windshield of a vehicle can be used. 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 jam information, regulation information, parking lot information, traffic accident information, service It is only possible to display traffic information such as congestion status information of the area, and display the distance to the next intersection, the traveling direction at the next intersection, such as characteristic photographs and frame diagrams at the intersection or searched route In addition, it is possible to display operation guidance, operation menus, key guidance, and FM multiplex broadcast programs for the image operation unit, operation unit 34, voice input unit 36, and the like.

  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. . In addition to the voice synthesized by the voice synthesizer, various sounds, various guidance information recorded in advance on a tape, a memory, and the like can be output.

  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. Then, traffic information can be received by the beacon receiver, and general information such as news and weather forecast can be received as FM multiplexed information in addition to the traffic information by the FM receiver. The beacon receiver and the FM receiver are unitized and arranged as a VICS receiver, but can be arranged separately.

  The communication unit 38 can also receive various data such as D-GPS information for detecting a detection error of the GPS sensor 15 transmitted from a predetermined base station. Further, the communication unit 38 can receive position information by radio wave beacons, optical beacons, and the like to detect the current location. In this case, the beacon receiver functions as a current location detection unit.

  Furthermore, the communication part 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, and various types of information are transmitted and received between the communication unit 38 and a communication unit (not shown) of the information center 51.

  A navigation system is constituted by the navigation device 14, the road traffic information center, the information center 51, the network 43 and the like.

  In the present embodiment, in order for the communication unit 38 to function as a communication terminal, a communication device such as a mobile phone is built in the communication unit 38 as a module. It is also possible to connect a device and connect the communication device and the communication unit 38. In that case, as a communication device, a mobile phone such as a mobile phone, a car phone, and a PHS, a wireless LAN card, etc. are used, a personal computer, a portable computer, a personal digital assistant (PDA), an electronic notebook, It is possible to use a videophone, game machine or the like having a communication function.

  The network 43 includes a LAN (Local Area Network), a WAN (Wide Area Network), an intranet, a mobile phone network, a telephone network, a public communication network, a dedicated communication network, a communication network such as the Internet, etc. Communication means can be used. As the network 43, communication means using CS broadcasting, BS broadcasting, terrestrial digital television broadcasting, FM multiplex broadcasting, etc. by a broadcasting satellite, or non-stop automatic used in an intelligent road traffic system (ITS) is used. Communication means such as a fee payment system (ETC) and a narrow area communication system (DSRC) can also be used.

  The information center 51 may be operated by any one of an individual, a company, a group, a local government, a government-related organization, etc., and may be operated by the road traffic information center.

  The information center 51 includes a server 53, a database (DB) 57 serving as an information recording unit connected to the server 53, the communication unit, and the like, and the information center 51 and the navigation device via the network 43 by the communication unit. 14, two-way communication is performed, and traffic information, general information, and the like are provided. For this purpose, the server 53 includes a CPU 54, a RAM 55, a ROM 56, and the like as an arithmetic device and a control device, and functions as a computer based on predetermined programs, data, and the like. Further, the same data as various data (including navigation data) recorded in the data recording unit 16 can be recorded in the database 57. 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.

  Then, the CPU 54 receives traffic information, general information, etc. transmitted from the road traffic information center, etc., and records them in the database 57 as primary information, or processes the primary information to perform statistical processing, Statistical data constituting historical information representing the history of traffic, traffic jam prediction information for predicting traffic jam conditions, and the like are created, and the statistical data is recorded in the database 57 as secondary information. In the present embodiment, in creating the statistical data, detailed conditions such as date / time, day of the week, weather, various events, seasons, facility information (presence / absence of large facilities such as department stores and supermarkets) are included in the history information. Is added.

  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. Note that the matching processing means (not shown) of the CPU 31 performs matching processing, and the current location is on any road link based on the trajectory of the read current location and the shape and arrangement of each road link constituting the surrounding road. The current location is specified by determining whether the current location is located.

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

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

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

  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 input as a destination.

  Then, when the destination is set, the route search processing means (not shown) of the CPU 31 performs route search processing, reads the current location, destination, etc., and also reads the search data, etc. from the data recording unit 16 to obtain the current location, destination. Based on the location and the search data, a route from the starting point represented by the current location to the destination is searched for as a searched route, and route data representing the searched route is output.

  Subsequently, a guidance processing means (not shown) of the CPU 31 performs guidance processing and guides the driver on the searched route, that is, 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.

  If necessary, the voice output processing means of the guidance processing means performs voice output processing and outputs a search route by voice from the voice output unit 37 to perform route guidance.

  Incidentally, route search processing can be performed in the information center 51. In that case, the CPU 31 transmits the current location, the destination, etc. to the information center 51. When the information center 51 receives the current location and destination, the route search processing means (not shown) of the CPU 54 performs the same route search processing, reads the search data from the database 57, and based on the current location, destination and search data. The route from the departure point to the destination is searched, and route data representing the searched route is output. Subsequently, a transmission processing unit (not shown) of the CPU 54 performs transmission processing and transmits the route data to the navigation device 14. Therefore, in the navigation device 14, when the information acquisition processing means acquires route data from the information center 51, the guidance processing means performs route guidance as described above.

  In this way, route guidance is performed, and the driver can drive the vehicle according to the searched route.

  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, etc. as additional information. Therefore, the route display processing means displays traffic information, general information, etc. 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 route display processing means converts each link information in the traffic information into, for example, a congestion arrow as a traffic condition index indicating a traffic congestion index indicating whether the traffic is congested or not. The congestion 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.

  Further, in the navigation device, when the vehicle is traveling along the searched route and there is a guidance intersection within a predetermined distance from the current location, an enlarged intersection view is formed in a part of the map screen. The enlarged map of the vicinity of the guidance intersection is displayed on the enlarged map of the intersection. The enlarged map includes a guidance intersection, an approach path to the guidance intersection, an exit path from the guidance intersection, and a land as a landmark representing a main facility. A mark or the like is displayed. Therefore, the driver can drive the vehicle along the searched route by advancing the vehicle in the order of the approach route, the guidance intersection, and the exit route while referring to the enlarged intersection view.

  However, if the driver is not familiar with the guidance intersection, or if the prospect at the guidance intersection is poor, etc., the exit route should be exited according to the searched route. May cause off-route. Similarly, at intersections other than the guidance intersection, if the driver is not familiar with the intersection or the line of sight at the intersection is poor, an off-route may occur.

  If the frequency of traveling along the searched route is low, the route may be repeatedly deviated at the same intersection, and in this case, the time until the destination is reached becomes long.

  Therefore, in the present embodiment, the intersection where the off-route occurs is recorded as the off-route point, and the route on which the vehicle actually travels when the off-route occurs, that is, the travel route is recorded, Thereafter, when the vehicle approaches an off-route point, the vehicle does not travel on the same travel route again.

  Next, the operation of the guidance process will be described.

  FIG. 3 is a main flowchart showing the operation of the guidance processing in the embodiment of the present invention, FIG. 4 is a diagram showing a subroutine of route miss determination processing in the embodiment of the present invention, and FIG. 5 is an out-of-route in the embodiment of the present invention. It is a conceptual diagram which shows the state of.

  In FIG. 5, Pr is the current location, Rt1 is the searched route, Cs1 is an intersection on the searched route Rt1, r1 and r2 are guide links representing roads on the searched route Rt1, Tk1 is a travel route, and k1 and k2 are the travel routes. A travel link representing a road on the route Tk1. The guide link r1 and the travel link k1 constitute an approach path to the intersection Cs1, and the guide link r2 and the travel link k2 constitute an exit path from the intersection Cs1. The intersection Cs1 is a guidance intersection when route guidance is performed.

  First, the guidance processing means starts route guidance, and subsequently, the travel route recording processing means of the guidance processing means performs travel route recording processing and starts recording the travel route Tk1 in the RAM 32 (FIG. 1). . In this case, the travel route Tk1 is recorded as travel route data including travel link data representing each travel link ki (i = 1, 2,...).

  Subsequently, the off-route determination processing means of the guidance processing means performs off-route determination processing, reads the current location Pr, and coordinates of each guidance link rj (j = 1, 2,...) Of the route data of the searched route Rt1. Is compared with the coordinates of the current location Pr, it is determined whether or not the current location Pr has left the search route Rt1 and an off-route has occurred.

  Then, when a route failure occurs, the route miss determination processing unit of the guidance processing unit performs a route miss determination process, and whether the route failure is a route error due to a driver's error, depending on whether the route miss determination condition is satisfied, Alternatively, it is determined whether the route is changed intentionally by the driver.

  For this purpose, the route miss determination processing means starts timing by the timer built in the CPU 31 at the timing when the route is deviated, and after the deviated route has occurred, whether the current location Pr has returned to the search route Rt1 within a predetermined time. Judge whether. When the current location Pr returns to the searched route Rt1 within a predetermined time, the route miss determination processing unit determines that the route miss determination condition is satisfied, and determines that the off-route is a route miss.

  The route miss determination processing means determines whether or not the vehicle has made a U-turn within a predetermined time after the departure of the route has occurred, based on a change in the vehicle direction or the current location Pr. Then, when the vehicle makes a U-turn within a predetermined time, the route miss determination processing unit determines that the route miss determination condition is satisfied, and determines that the off-route is a route miss.

  Further, if the current location Pr does not return to the searched route Rt1 within a predetermined time and the vehicle does not make a U-turn, the route miss determination processing unit determines that the route miss determination condition is not satisfied, and the route is not routed. Judge that it is a change.

  When it is determined by the route miss determination processing means that the off-route is a route miss, the route information recording processing means of the guidance processing means performs a route information recording process to obtain route information about the off-route point, that is, the off-route. The coordinates of the point, the guide links r1 and r2 before and after the off-route point, the travel links k1 and k2 before and after the off-route point, the traveling direction of the vehicle at the guide links r1 and r2, and the like are recorded in the RAM 32.

  Then, it is determined whether or not the vehicle has arrived at the destination. When the vehicle has arrived at the destination, the guidance processing means ends the route guidance.

  In the present embodiment, the route miss determination processing unit starts timing by a timer at the timing when a route deviation occurs, and when the current location Pr returns to the searched route Rt1 within a predetermined time, or within a predetermined time When the vehicle makes a U-turn, it is determined that the route mistake determination condition is satisfied, but the distance traveled by the vehicle from the off-route point is calculated, and the current location Pr is set on the search route Rt1 before traveling the predetermined distance. It is determined whether the vehicle has returned and whether the vehicle has made a U-turn before traveling a predetermined distance. If the current location Pr returns to the search route Rt1 before traveling a predetermined distance, or travels a predetermined distance If the vehicle makes a U-turn before, it can be determined that the route miss determination condition is satisfied.

  Further, node points, road links, and the like constituting the road data are counted with an off-route point as an initial value, whether the current location Pr has returned to the search route Rt1 before the count value reaches a predetermined value, and the count value is It is determined whether the vehicle has made a U-turn before the predetermined value is reached, and the current location Pr returns to the search route Rt1 before the count value reaches the predetermined value, or before the count value reaches the predetermined value. When the vehicle makes a U-turn, it can be determined that the route mistake determination condition is satisfied.

Next, the flowchart of FIG. 3 will be described.
Step S1: Route guidance is started.
Step S2: Recording of the travel route Tk1 is started.
Step S3: It is determined whether or not a route deviation has occurred. If a route deviation has occurred, the process proceeds to step S4, and if not, the process proceeds to step S7.
Step S4: Route miss determination processing is performed.
Step S5: It is determined whether or not the flag fg is 1. If the flag fg is 1, the process proceeds to step S6. Otherwise, the process proceeds to step S7.
Step S6: The off-route point, the guide links r1 and r2, the travel links k1 and k2, and the traveling direction before and after the route are recorded.
Step S7: It is determined whether or not the destination has been reached. If it arrives at the destination, the process proceeds to step S8, and if it does not arrive, the process returns to step S3.
Step S8: The route guidance is finished and the process is finished.

Next, the flowchart of FIG. 4 will be described.
Step S4-1: Set 0 to the flag fg.
Step S4-2: Timing is started.
Step S4-3: It is determined whether or not the current location Pr has returned to the searched route Rt1 within a predetermined time. If the current location Pr returns to the search route Rt1 within a predetermined time, the process proceeds to step S4-5, and if not, the process proceeds to step S4-4.
Step S4-4: It is determined whether the vehicle has made a U-turn within a predetermined time. If the vehicle makes a U-turn within a predetermined time, the process proceeds to step S4-5, and if not, the process proceeds to step S4-6.
Step S4-5: Set 1 to the flag fg.
Step S4-6: Ends timekeeping and returns.

  Next, a case where the vehicle is driven along the same route as the searched route Rt1 after the route information is recorded will be described.

  FIG. 6 is a flowchart showing the operation of another guidance process according to the embodiment of the present invention, FIG. 7 is a diagram showing a first example of an enlarged intersection view according to the embodiment of the present invention, and FIG. The figure which shows the 2nd example of the intersection enlarged view in a form, FIG. 9 is a figure which shows the 3rd example of the intersection enlarged view in embodiment of this invention.

  First, the guidance processing means starts route guidance. Subsequently, the point determination processing means of the guidance processing means performs point determination processing, reads the current location Pr, and also includes route information from the RAM 32 (FIG. 1). The coordinates of the off-route point are read out, and it is determined whether or not the vehicle has approached the off-route point depending on whether the distance between the current location Pr and the off-route point is shorter than the set value.

  When the distance between the current location Pr and the off-route point becomes shorter than the set value, and the vehicle approaches the off-route point, the guidance link determination processing unit of the guidance processing unit performs the guidance link determination process, and the guidance link rj of the route data. And the guide links r1 and r2 in the route information are read out to determine whether or not the current guide link rj matches the recorded guide links r1 and r2. When the current guidance link rj and the recorded guidance links r1 and r2 match, the guidance link determination processing means determines that the traveling direction of the current guidance link rj and the traveling direction of the recorded guidance links r1 and r2 are the same. When it is determined whether or not the traveling direction of the current guidance link rj coincides with the traveling direction of the recorded guidance links r1 and r2, the notification processing unit of the guidance processing unit performs notification processing and The user is notified of the off-route occurring at the off-route point. Therefore, the notification processing means notifies the driver of the previous travel link k2 that caused the route mistake as a miss route indicating that it is on a route different from the searched route Rt1.

  That is, the notification processing means forms an enlarged intersection map Vs1 in a partial area of the map screen formed on the display unit 35, displays an enlarged map around the intersection Cs in the enlarged intersection map Vs1, and searches The route Rt1 and the travel link k2 are displayed. In addition, an indicator for indicating that the travel link k2 is a miss route, that is, a cross mark as a miss route indicator is superimposed on the travel link k2.

  Incidentally, when the vehicle is traveling along the searched route Rt1, when the intersection Cs within a predetermined distance from the current location Pr is a guidance intersection, as shown in FIG. An intersection enlarged view Vs2 is formed in the area of the portion, the search route Rt1, the guidance intersection CR1, etc. are displayed on the intersection enlarged view Vs2, and a misroute display portion Vs3 is formed in a predetermined area in the intersection enlarged view Vs2, The missed route display portion Vs3 can display the searched route Rt1, the guidance intersection CR1, the traveling link k2, and the like, and the x mark can be superimposed on the traveling link k2.

  Furthermore, as shown in FIG. 9, an enlarged intersection map Vs4 can be formed, and the search route Rt1, the intersection Cs, the travel route Tk1, the travel link k2, and the like can be displayed on the enlarged intersection map Vs4. In this case, for example, the driver can know what travel route Tk1 the vehicle has traveled along and return to the search route Rt1.

  Then, it is determined whether or not the vehicle has arrived at the destination. When the vehicle has arrived at the destination, the guidance processing means ends the route guidance.

  Thus, in the present embodiment, when approaching an off-route point, the driver is notified of the off-route that occurred at the off-route point based on the route information. Even when the frequency of traveling the vehicle along the searched route Rt1 is low, it is possible to suppress the occurrence of repeated off-route at the same intersection Cs. Therefore, the time until reaching the destination can be shortened.

Next, the flowchart of FIG. 6 will be described.
Step S11: Route guidance is started.
Step S12: It is determined whether the vehicle has approached the off-route point. If the vehicle approaches an off-route point, the process proceeds to step S13, and if not, the process proceeds to step S16.
Step S13: Determine whether the guidance links match. If the guide links match, the process proceeds to step S14, and if not, the process proceeds to step S16.
Step S14: It is determined whether or not the traveling directions in the guidance links are the same. If the traveling directions in the guidance links match, the process proceeds to step S15, and if not, the process proceeds to step S16.
Step S15: The previous travel link k2 is notified.
Step S16: It is determined whether or not the destination has been reached. If the destination has been reached, the process proceeds to step S17, and if not, the process returns to step S12.
Step S17: The route guidance is finished and the process is finished.

  In the present embodiment, the notification processing means notifies on the map screen of the off-route, but can also notify by voice using the voice output unit 37.

  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 conventional intersection enlarged view. It is a main flowchart which shows the operation | movement of the guidance process in embodiment of this invention. It is a figure which shows the subroutine of the route mistake determination process in embodiment of this invention. It is a conceptual diagram which shows the state of off-route in embodiment of this invention. It is a flowchart which shows the operation | movement of the other guidance process in embodiment of this invention. It is a figure which shows the 1st example of the intersection enlarged view in embodiment of this invention. It is a figure which shows the 2nd example of the intersection enlarged view in embodiment of this invention. It is a figure which shows the 3rd example of the intersection enlarged view in embodiment of this invention.

Explanation of symbols

14 Navigation device 15 GPS sensor 17 Navigation processing unit 31, 54 CPU
43 Network 51 Information Center 53 Server Pr Present Location Rt1 Search Route r1, r2, rj Information Link

Claims (7)

  A current location detection unit for detecting a current location, route search processing means for searching for a route from the departure point to the destination and using the route as a search route, and a route for determining whether the current location is away from the searched route and an off-route has occurred. A departure determination processing means, a route information recording processing means for recording route information about an out-of-route point representing a point where the out-of-route occurred when the out-of-route occurs, and a vehicle after the route information is recorded Notification processing means for determining whether or not the vehicle has approached the off-route point and, when approaching the off-route point, based on the route information, notifies the driver of the off-route occurring at the off-route point; A route guidance system comprising:   When the off-route occurs, the route information recording processing unit has a route miss determination processing unit that determines whether the off-route is a route miss due to a driver's mistake. The route guidance system according to claim 1, wherein route information about the route mistake is recorded.   3. The route guidance system according to claim 2, wherein the route miss determination processing unit determines that the route miss is a route miss when the current location returns to the searched route after the route miss occurs.   The route guidance system according to claim 2, wherein the route miss determination processing means determines that the route miss is a route miss when the vehicle makes a U-turn after the route miss occurs.   The route according to claim 1, wherein the route information includes guide links before and after an off-route point, and the notification processing unit performs the notification when the current guide link matches the recorded guide link. Guidance system.   The route information has a traveling direction in the guidance link at the off-route point, and the notification processing means performs the notification when the traveling direction in the current guidance link matches the traveling direction in the recorded guidance link. The route guidance system according to claim 1. Route search processing means that searches the route from the departure point to the destination by using a computer as a search route, the current location detected by the current location detection unit leaves the searched route, and determines whether or not the route is off A determination processing unit, a route information recording processing unit that records route information about an out-of-route point that represents a point at which the out-of-route occurs when the out-of-route occurs, and a vehicle that is routed after the route information is recorded It is determined whether or not an off-point has been approached, and when the off-route point is approached, based on the route information, the driver is made to function as a notification processing means for notifying about the off-route occurring at the off-route point. A route guidance method program characterized by the above.

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