JP3585007B2 - Vehicle navigation system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicular navigation device that performs route guidance to a destination according to a searched route, and more specifically, performs a re-search at the time of off-route or at regular intervals, and stores the re-searched route. The present invention relates to a vehicular navigation device that immediately performs a necessary route display process in response to a driver's re-search request.
[0002]
[Prior art and its problems]
2. Description of the Related Art A conventional vehicle navigation device has been proposed which has a function of detecting a route deviation and performing a re-search when the vehicle deviates from a guidance route while guiding to a destination according to a searched route. In this re-search, when the out-of-route is detected, the out-of-route is notified on the map display screen, a re-search switch for prompting the start of the re-search is displayed, and the re-search is started by pressing the re-search switch. There is one (manual reroute function) and one that automatically starts re-search (auto reroute function). Whether the auto reroute function is used (auto reroute on mode) or not (auto reroute off mode) is set in advance.
In the conventional auto-reroute on mode, a route (peripheral search) for automatically connecting to the original route (predetermined route) by detecting that the route is deviated from the preset route is detected, or a deviated route is detected. A new route (all routes) from the current position of the vehicle to the destination is searched for, and the route to the destination is provided to the driver. In the off mode of the auto reroute function, re-searching when a deviation from the route is detected is not automatically performed, so that the driver is notified of the deviation from the route and a re-search switch is used according to the driver's will. It is configured to perform a re-search process.
[0003]
However, in the conventional auto reroute function, particularly in the auto reroute off mode, when the driver wants to execute the re-search process, a timely search process result cannot be obtained. That is, a re-search is performed after instructing execution of the re-search process, and a time lag occurs until the result is displayed on the display screen. In particular, when the vehicle deviates from a preset route as a re-search process and a route search from the position where the driver made the re-search request to the destination, that is, a so-called all route search is performed, the search processing time is long. This causes a problem of further increasing the time lag.
An object of the present invention is to perform a re-search internally when the vehicle deviates from the guidance route or at regular intervals, and displays the re-searched route when a re-search request is issued by the driver to quickly guide the route. It is an object of the present invention to provide a vehicular navigation device adapted to perform the above.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention according to claim 1 is a vehicle navigation device for performing route guidance to a destination according to a searched route, comprising: storage means for storing map information; And a current position detecting means for detecting a traveling direction, and a route searching means for searching for a guide route from a current position to a destination based on information stored in a storage means and re-searching for a guide route when the guide route deviates. Route storage means for storing a route searched by the route search means and a route re-searched when deviating from the guidance route; a result detected by the current position detection means and a guidance route stored in the route storage means Route deviation detecting means for detecting deviation from the guidance route based on the information, output means for outputting guidance information based on the guidance route, and guidance route searched by the route searching means A central processing means for outputting to the output means guidance information based on the current position detected by the current position detecting means, and route output instruction means for instructing the output of the re-searched route stored in the route storage means, the route output The instructing means displays an auto-reroute-on mode for automatically starting route guidance based on the re-search result, and stores the re-search result, and displays the stored re-search result based on the driver's re-search output instruction. Means for selecting an auto reroute off mode for starting route guidance, and when the auto reroute off mode is selected and the vehicle is out of the guidance route, the central processing means Is characterized by outputting the re-searched route stored in the route storage means and performing route guidance based on the re-searched route .
The invention according to claim 2 is a vehicular navigation apparatus for performing route guidance to a destination according to a searched route, wherein a storage means for storing map information, and a current position detection for detecting a current position and a traveling direction of the vehicle. Means, a route search means for searching for a guide route from the current position to the destination based on the information stored in the storage means, and re-searching the guide route at regular intervals, and a route searched by the route search means. Route storage means for storing the searched route; output means for outputting guide information based on the guide route; and guide information based on the guide route searched by the route search means and the current position detected by the current position detecting means. a central processing means for outputting to said output means, and route output instruction means for instructing the output of the re-searched route stored in the route storage means, the route output instructing means Auto-reroute on mode, which automatically starts route guidance based on the re-search result, and displays the re-search result stored based on the driver's re-search output instruction by storing the re-search result and performs route guidance. Means for selecting an auto-reroute-off mode to be started; when the auto-reroute-off mode is selected, the central processing means causes the re-searched route stored in the route storage means to be searched by a driver's re-search instruction. Route guidance is performed based on the route that has been output and searched again .
[0005]
According to the configuration of the first aspect, when a deviation from the route is detected, the route searching means performs a re-search, and stores the searched route in the route storage means. When the driver instructs the route guidance by the route re-searched by the route output instructing unit, the central processing unit outputs the guide information based on the re-searched route stored in the route storage unit to the output unit, and outputs the guidance information to the destination. We will guide you up to. By executing the re-searching process internally as described above, even in the auto reroute / off mode, when the driver requests re-searching, the necessary route can be output immediately, and the conventional time lag can be achieved. Can be apparently prevented. In addition, since a re-searched result can be automatically or manually output when a deviation from the route is detected, route guidance according to the user's preference can be performed.
According to the configuration of the second aspect, the route searching means performs a re-search at regular intervals, and stores the searched route in the route storage means. When the driver instructs the route guidance by the route re-searched by the route output instructing unit, the central processing unit outputs the guide information based on the re-searched route stored in the route storage unit to the output unit, and outputs the guidance information to the destination. We will guide you up to. By executing the re-search process at regular intervals in this manner, when the driver requests a re-search, the re-searched route is instantaneously displayed, and route guidance can be started based on the re-searched route. .
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a system configuration of a vehicle navigation device. This embodiment has an auto-reroute function for automatically starting re-searching when a deviation from the route is detected, switching the route from the previous guide route to the re-searched route based on the result, and performing route guidance, In particular, the auto-reroute function stores the auto-reroute on mode and the re-search result that immediately start route guidance based on the re-search result, and displays the stored re-search result based on the driver's re-search output instruction. And has an auto-reroute-off mode for starting route guidance.
[0007]
In FIG. 1, a vehicle navigation device includes an input / output device 1 for inputting and outputting information relating to route guidance, a current position detection device 2 for detecting information relating to the current position of the vehicle, navigation data and route guidance required for calculating a route. And a central processing unit 4 for executing route search processing and display / voice guidance processing necessary for route guidance and controlling the entire system. .
[0008]
The input / output device 1 allows a user to input information necessary for setting a destination such as a departure place, a destination, and a passing point, and to output voice guidance and / or display on-screen guidance information when the driver needs it. In addition to the function of instructing the central processing unit 4 to perform the navigation processing according to the intention of the user, there is provided a function of printing out the processed data and the data of the data communication. As means for realizing the function, the input unit is constituted by a touch switch 11 for inputting an address, a telephone number, coordinates, and the like for setting a destination, and requesting route guidance. The output unit displays input data on the screen, or displays the driver's request or the route guidance automatically on the display 12, the data processed by the central processing unit 4, the data stored in the information storage device 3, and the communication data. It comprises a printer 13 for printing out and a speaker 14 for outputting route guidance by voice.
[0009]
The display 12 is constituted by a color CRT or a color liquid crystal display, and all screens necessary for navigation, such as a destination setting screen, a section map screen, and an intersection map screen, based on map data and guidance data processed by the central processing unit 4. Are displayed in color and keys for setting route guidance, performing guidance during route guidance, and performing a screen switching operation are displayed on this screen. The display 12 is provided with a touch switch 11 corresponding to the display of a function key, and is configured to execute the above-described operation based on a signal input by key touch. The current position detecting device 2 is a GPS receiving device 21 using a satellite navigation system (GPS), a beacon receiving device 22, for example, a data transmitting / receiving device 23 receiving a GPS correction signal using a car phone or an FM multiplex signal, for example, a geomagnetic sensor An absolute azimuth sensor 24 composed of, for example, a wheel sensor and a steering sensor, and a distance sensor 26 for detecting the traveling distance from the number of rotations of the wheels. Detect coordinates and the like.
[0010]
The information storage device 3 includes, for example, a map data file storing map information, an intersection data file storing information on intersections, and road data storing information on roads, such as road types and starting points and ending points of each road, necessary for route guidance. File, a node data file that stores the east longitude and north latitude coordinates at one point on the road, location information of landmarks such as gas stations and convenience stores classified by genre, and guidance information about the landmarks. It consists of stored guide point data files and the like.
[0011]
The central processing unit 4 executes a program mounted thereon to realize the functions of the present system and executes a calculation process. The CPU 40 performs a program such as a route search, a display control required for route guidance, and a voice guidance. ROM 41 in which a program for performing an accurate voice output control and data necessary for the program are stored, route storage means for storing road information (road sequence data, guidance intersection data) after route search or re-search, and route guidance information; A memory 42 composed of a RAM or a non-volatile memory for temporarily storing data being processed, a second ROM 43 storing display data necessary for route guidance and map display, an image used for screen display on a display Image memory 44 in which data is stored, image data is taken out from the image memory based on a display control signal from the CPU. An image processor 45 that performs image processing and outputs the result to a display, synthesizes voice data (phrases, a set of sentences, sounds, and the like) read from the information storage device 3 based on a voice output control command from the CPU, and performs analog processing. An audio processor 46 that converts the signal into a signal and outputs the signal to a speaker, a communication interface 47 that exchanges input / output data by communication, a sensor input interface 48 for receiving a sensor signal of the current position detection device 2, a date and It is composed of a clock 49 for writing time. Here, the route guidance is configured so that the driver can select either the screen display or the voice output.
[0012]
In order to realize the function of this embodiment, the following means are provided. That is, the destination setting means includes a CPU 40 for executing a program relating to a destination setting process stored in the first ROM 41, a touch switch 11 and a display 12 of the input / output device 1 for inputting a destination and outputting a map display, etc. And an input / output processing unit including an interface 47 for inputting a destination input signal from the touch switch 11 to the central processing unit 4. The route deviation detecting means has a function of detecting that the vehicle has deviated from the guidance route based on the current position information of the vehicle and the guidance route information, and is constituted by the CPU 40 executing a program relating to the route deviation detection process stored in the first ROM 41. You. The route searching means has a function of searching for a route to be guided based on the set departure place (current position of the vehicle) and a destination and a function of re-searching for a guide route when a deviation from the route is detected. The CPU 40 executes a program related to the stored route search process. The output means has a function of outputting guidance based on the searched route, and executes a program related to display / voice processing stored in the first ROM 41, a CPU 40, an image processor 45, a voice processor 46, a display 12, a speaker 14, and the like. It is constituted by. The central processing means has a function of outputting guidance information based on the searched guidance route and the detected current position, and is constituted by the CPU 40 executing a program relating to guidance information output processing stored in the first ROM 41. The route output instructing means instructs the output of the stored re-searched route, and is constituted by a re-search switch composed of the touch switch 11.
[0013]
This system calculates an estimated position based on various sensor signals of the current position detection and GPS data, determines a position on the road by correlating the estimated position with a road on the map and GPS data, and determines the current position. Ask. The present system also has a function of illuminating the current position with a route to a destination and determining whether or not a position on the lane of the own vehicle is approaching a predetermined guide point. That is, the above function determines a predetermined distance before the intersection on the guide route, an automatic voice output after the intersection is determined, and a timing of displaying the intersection information such as the name of the passing intersection. A guidance command is issued to the image processor and the audio processor based on the result of this determination. Further, when the request signal is input, it instructs the voice processor to provide voice guidance of the current position. In the voice guidance of the present system, voice data (phrases, a single sentence, sound, etc.) read from the information storage device 3 is synthesized, converted into an analog signal, and output from a voice output unit.
[0014]
Next, a road data structure related to the searched route will be described. The search road data (guide road data) has a data configuration as shown in FIG. The data stores information on roads connected to each road and information unique to each road.
The start point and the end point (intersection, branch point, etc.) and the road numbers connected to the start point and the end point, respectively, are stored, and information on the connection relationship between the roads is stored. In addition, information such as the length of each road, road attributes (highway, national road, prefectural road, etc.), road width, and the like are provided as road-specific road characteristics and have a cost coefficient as a reference at the time of search. Also, in connection with the connection information between roads, guidance-unnecessary road information (for example, a road of (3) is a straight-ahead road with respect to a road of (1) in the figure, and is a guidance-unnecessary road. Even if there is no road, guidance is not required if it is on the road) and prohibition information (entry prohibition) is stored, which is one of the costs for determining the optimum route at the time of searching. In addition to the information shown in the figure, determine the cost based on whether the vehicle is turning right or left (the coefficient is higher than the left because it is harder to drive right), or change the coefficient for the right or left depending on the size of the intersection (for large intersections). It may take some time to turn right or left.) In addition, as information specific to the road, in addition to the length, shape information may be stored, so that the cost of the winding road may be increased.
[0015]
Next, the concept of the re-search function will be described using a display screen. In the destination setting, automatic re-search (auto-reroute) is selected on the re-search condition setting screen 5 shown in FIG. If ON is selected during the route guidance by the map display shown in FIG. 4 (automatic rerouting on mode), the system automatically detects the departure of the route, that is, the current position of the vehicle, that is, the current position displayed on the map. A peripheral search centering on the mark 9 is performed, a route recalculation to the guide route 7 is performed, and the re-search route is displayed. When OFF is selected (automatic reroute off mode), when a route deviation is detected, a re-search switch 8 is displayed on the map to notify the user of the deviation of the route, and a re-search is performed as an internal process. The route stored is stored in the route storage means. The route obtained by this internal processing is not immediately displayed. For example, when auto-reroute off is selected, a deviation from the route is detected, and if the displayed re-search switch is pressed, the re-search is immediately started. This re-search may be performed, for example, by manually setting in advance the peripheral search or the entire route search, and performing the search in the mode set when the route deviates. In addition, a search for the periphery may be performed within a predetermined distance after the detection of the departure of the route, and the search may be switched to the entire route search after traveling the predetermined distance. Reference numeral 10 denotes a screen operation switch. In addition to the re-search switch 8, in this example, switches for details, all routes, a wide area, and correction are provided.
[0016]
When the re-search switch is not pressed, the system performs a peripheral search as shown in FIG. 5, and as a result, does not perform display processing on the re-searched route, and displays the re-searched route (the route indicated by a dotted line in the drawing). It is stored in the route storage means. When the re-search switch is pressed while traveling on a guideable road, the previously searched and stored route is displayed as a new guide route combined with the previous guide route (see FIG. 6). This re-search is executed at regular intervals by an interrupt process until the re-search switch is pressed, and the stored route is updated based on the result. That is, when the re-searched route shown in FIG. 7 is stored, and a peripheral search with priority given to the traveling direction results in obtaining a different re-searched route as shown in FIG. The route stored in FIG. 4 is updated based on the stored route. Therefore, when the re-search switch is pressed, the re-searched route is instantaneously displayed as shown in FIG.
[0017]
Next, processing of a system having a function of re-searching for an optimal route when a route deviation is detected will be described. FIG. 10 shows a flow of processing for performing route guidance from destination setting. The current position (departure point) required for the route search is acquired (S1), the destination setting condition is entered on the destination setting screen to set the destination (S2), and the route search is performed (S3). . At this time, it is set whether the re-search should be performed automatically (auto reroute on) or performed by the driver's will (auto reroute off). That is, ON or OFF of the auto reroute is set as the re-search condition.
[0018]
After the route search, MODE = 2 for indicating the end of the process is set, and the distance from the guide route which is the basis of the deviation detection is set (S4). When the guidance start switch is pressed on the searched route to start the route guidance, the current position of the own vehicle is measured and the current position is tracked (S5). Next, the distance from the current position to the set route is obtained, and it is determined whether the route deviates based on whether the distance exceeds the value (predetermined distance) set in step S4 (S6). When the off-route is detected, the off-route processing is executed (S7). In the off-route processing when the auto reroute is off, a re-search route to the destination is always calculated and stored in the route storage means. In particular, when the automatic reroute is off, in the route deviation determination processing executed in step S6, the determination is not for the latest route that has been re-searched, but for the search route before the route departure.
[0019]
When the route is not deviated, the guidance is continuously performed according to the set route (S8). When the vehicle is on the route, MODE = 0 is set to indicate the distance, the remaining distance from the current position to the destination is determined (S9), and the arrival at the destination is determined based on whether the remaining distance is within a predetermined value. (S10) If the remaining distance is equal to or less than the predetermined value, it is determined that the vehicle has arrived at the destination, and the route guidance ends. On the other hand, if the remaining distance exceeds the predetermined value, the process returns to step S5 to continue the current location tracking. The off-route detection is performed by a timer interruption process.
[0020]
In step S6, when a route deviation is detected, the route deviation processing of FIG. 11 is executed. First, the selection of the auto-reroute-on mode is determined (S11). If the mode is ON, the re-search processing is executed (S12), and the re-searched route is displayed and displayed (S13). If it is OFF, re-search processing is executed (S14), and thereafter, it is determined whether or not the current position is on the re-searched route (newest route) (S15). Further, when the vehicle travels after changing the route, that is, when the vehicle is not on the latest route, a new re-search is executed (S14). When it is on the latest route, the operation of the re-search switch is determined (S16), and when it is not pressed, the process returns to step S15. When it is turned on, it is determined whether the currently running road is a guideable road (S17). If the road is not a guideable road, the process returns to step S15. If it is a guideable road, a route display process is performed and displayed (S18). Here, a guideable road is a road on which a route can be searched, and this road is provided as data separate from display roads (local roads and the like).
[0021]
Next, another embodiment of the route departure process will be described with reference to FIG. If a deviation from the route is detected, it is determined whether the current position is on a guideable road (S20). If the vehicle is on a guideable road, a peripheral search is performed to return to the original guide route from the current position (S24). If the vehicle is not on a guideable road, it is determined whether the vehicle is on a road only for display and matching, such as a local road or a road with a predetermined road width or less (S21). When the vehicle is traveling in a place such as a car park or a facility plaza, the process returns to step S20. When the vehicle is on the above-mentioned road, the road data of the currently traveling road is obtained (S22), and a connection point to a guideable road ahead in the traveling direction is obtained (S23). Based on the acquired road data and connection point data, a peripheral search for returning to the original guide route from the current position is executed (S24).
[0022]
The route obtained by the peripheral search is stored (S25), and it is determined whether the vehicle is on the searched route based on the current position information of the vehicle (S26). This determination is made when the vehicle enters a guideable road from the connection point.
If the user is on a guideable road, the route display process is performed by pressing the re-search switch (S27), and the re-searched route is displayed (S28). In steps S26 and S27, if it is not on the searched route, or if the re-search switch is not pressed within a predetermined time even on the searched route, the process returns to step S20. In the above other embodiment, the auto reroute on mode is not determined. However, the process may be configured to follow the step (1) in FIG. 11 and determine the use of the auto reroute.
[0023]
Next, the re-search processing will be described. When the automatic reroute is turned on, the result of the re-search is immediately subjected to the route display processing and displayed on the map screen. On the other hand, when the auto-reroute is turned off, the route display process of the route stored in the route storage means as an internal process and performed by the driver pressing the re-search switch is performed. FIG. 13 shows the flow of the re-search process.
When the re-search process is executed, it is first determined whether or not the current position is on a guideable road (S30). If the current position is outside the guideable road, it indicates that the vehicle is traveling outside the guide road. MODE = 1 is set, and when the vehicle returns to the guideable road, the search is performed again (S31). On the other hand, MODE = 1 has been set in the re-search processing when the vehicle is traveling outside the guide road. However, when the vehicle is traveling on a guideable road thereafter, it is on the route (MODE = 0) or outside the guide road (MODE). = 1) is determined (S32). When MODE = 0 or MODE = 1, a re-search start position is set (S34).
[0024]
When MODE = 0 or MODE = 1 is not satisfied, the re-search process is terminated (MODE = 2), and it is determined whether the vehicle has traveled a predetermined distance on a guideable road (S33). If MODE = 2 and the vehicle has traveled a predetermined distance, a search start position is set (S34). Here, the determination of NO in step S33 is, for example, a case where, after a route search, the vehicle travels on a road that can be guided in a direction opposite to a certain direction of the route. Thus, even when the vehicle travels in the reverse direction, re-search is started after traveling a predetermined distance.
[0025]
In the re-search start position setting process, for example, the position on the map at which the re-search is started to execute is positioned a predetermined distance in the traveling direction of the vehicle. This takes into account the fact that the vehicle is traveling and that the re-searching process takes some time. For example, the route obtained by re-searching may be a route that requires a right or left turn immediately, or a route that cannot be dealt with suddenly may be extracted after the driver presses the re-search switch to display the route. If the current position is just before the intersection at the start of the re-search, but the vehicle has gone straight ahead of the intersection at the end of the re-search, the search result turns right and left at the crossed intersection A situation such as a route or the need to start re-search immediately is reduced.
[0026]
When the re-search start position is set, route recalculation is executed (S35), and the result is determined (S36). If the route is obtained by the route recalculation (the determination of the success of the route output is YES), MODE = 2, a predetermined distance is set (S37), and the process ends. If the route is not obtained by the route recalculation (the determination of the success of the route output is NO), MODE = 3 indicating the search failure is set (S38), and the process ends. If the route is not output, it depends on the search program installed in the system. For example, if the program is set so that the U-turn route is not output, the search is performed with priority given to the traveling direction of the vehicle at the time when the departure from the route is detected, but if the currently running road has a dead end, the search is performed again. Judge that there is no route. When the distance from the current position to the destination on the re-searched route is larger than a value obtained by multiplying the distance from the current position to the destination by returning to the original route by a predetermined value, the output of the re-searched route is output. It may be impossible. That is, if the result of the re-search does not satisfy the preset condition, the output is disabled.
[0027]
FIG. 14 shows another embodiment of the re-search processing. In the present embodiment, the re-search is executed, and the re-searched route (the dotted line portion in FIG. 5 or FIG. 8) is displayed before the re-search switch is pressed by the driver. 13 is different from the re-search processing in FIG. 13 in that a route searched again when MODE = 2 and a predetermined distance is traveled in step S33 is displayed. Description is omitted.
Since the search has been completed with MODE = 2, when the vehicle travels a predetermined distance on a guideable road, the previous route, that is, the guide route that was traveling before the departure of the route is detected is deleted from the map (S39). ), And displays the result of the re-search (S40).
[0028]
In the route recalculation in step S35, the peripheral search and the entire route search in the case where the traveling direction of the vehicle is prioritized are performed. FIG. 14 shows an example of the periphery search. The search data (road data, intersection data, etc.) around the vehicle is read from the information storage device 3 (S41). Then, the road sequence data of the guide route before deviating from the route (hereinafter, referred to as the previous guide route) is acquired from the route storage means constituted by the memory 42 in the central processing unit 4 (S42). A route is defined by a road sequence obtained by connecting roads between intersections. Here, “acquisition” means taking in data from the route storage unit into the work area of the route search unit. Then, the traveling direction and the penalty at each intersection are calculated in the direction of returning to the previous guide route (S43). The penalty is a coefficient determined based on the road type, road length, road width, right / left turn, presence / absence of traffic light, traffic regulation, and the like. When the route is not connected due to no entry, one-way traffic, or a U-turn, the penalty is set to “∞”. In this peripheral search, a penalty is added in the direction to return to the previous guide route, and an optimum route search is performed.
[0029]
The current road and traveling direction of the vehicle are acquired based on the current position information from the current position detection device and the map information from the information storage device (S44). Subsequently, an intersection that leads to the current location road is selected in the traveling direction, and a route that returns to the previous guide route is determined based on the traveling direction to each intersection and a penalty (S45). The searched route and the preceding guide route are created as a guide route from now on, and the road sequence is created (S46). FIG. 15 shows an all route recalculation process giving priority to the traveling direction. Based on the current position information from the current position detection device and the map information from the information storage device, the current road and traveling direction of the own vehicle are obtained (S50), and the destination road is obtained (S51). The search data between them is read (S52). Subsequently, an intersection to which the current road is connected is selected in the traveling direction, a route to the destination is determined based on the traveling direction to each intersection and a penalty (S53), and the road sequence is re-created using the route as a guide route (S54). ).
[0030]
In practicing the present invention, the re-search can be applied to either a peripheral search or an all-route search. For example, in the case of manually instructing the peripheral search or the entire route search in advance, a mode switching routine is separately provided, and the re-search program is selectively used depending on the mode at the time of the re-search.
In addition, as a method of switching between the peripheral search and the entire route search, for example, when the re-search switch is operated after detecting a deviation from the route, the first output is the peripheral searched route, and after this operation, a predetermined distance is set. The entire route search may be executed by running or operating the re-search switch again within a predetermined time. In this case, both the route for the peripheral search and the route for the entire route search are searched and stored in the route storage means, or only the route for the peripheral search is calculated and stored, and the second re-search switch is used. All routes may be calculated when an operation is performed.
Further, the present invention can also be applied to a vehicle navigation device having a manual reroute function for instructing a re-search by a driver's will.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a system configuration of a vehicle navigation device according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of search (guidance) road data.
FIG. 3 is an explanatory diagram showing an example of a re-search condition setting screen.
FIG. 4 is an explanatory diagram of a route deviation on a map display screen during route guidance.
FIG. 5 is an explanatory diagram regarding a re-search result after a route deviation is detected in an auto-reroute / off mode.
FIG. 6 is an explanatory diagram after a display process of a re-search result when the re-search switch in FIG. 5 is pressed.
FIG. 7 is an explanatory diagram of a re-search result by a timer interrupt when the re-search switch is not pressed in FIG. 5;
FIG. 8 is a diagram illustrating a screen subsequent to FIG. 7 and showing a result of a subsequent re-search.
FIG. 9 is an explanatory diagram after the display processing of the re-search result when the re-search switch is pressed in FIG. 8;
FIG. 10 is a diagram showing a main flow of a route guidance process from a departure place to a destination.
FIG. 11 is a flowchart of a route departure process.
FIG. 12 is a flowchart of another embodiment of a route departure process.
FIG. 13 is a flowchart of a re-search process.
FIG. 14 is a flowchart of another embodiment of the re-search processing.
FIG. 15 is a flowchart of a route recalculation process of a peripheral search.
FIG. 16 is a flowchart of a route recalculation process in an all route search.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Input-output device, 2 ... Current position detection device, 3 ... Information storage device, 4 ... Central processing unit, 5 ... Re-search condition setting screen, 6 ... Map display screen, 7 ... Guide route, 8 ... Re-search switch, 9: Current position mark of vehicle, 10: Function switch for screen operation.

Claims (2)

A vehicle navigation device that provides route guidance to a destination according to a searched route,
Storage means for storing map information;
Current position detecting means for detecting the current position and the traveling direction of the vehicle,
Route search means for searching for a guide route from a current position to a destination based on the information stored in the storage means and performing a re-search for the guide route when deviating from the guide route;
Route storage means for storing a route searched again by the route search means and a route searched again when deviating from the guidance route;
Route deviation detection means for detecting deviation from the guidance route based on the result detected by the current position detection means and the guidance route information stored in the route storage means,
Output means for outputting guidance information based on the guidance route;
Central processing means for outputting guidance information to the output means based on the guide route searched by the route search means and the current position detected by the current position detection means,
Route output instructing means for instructing the output of the re-searched route stored in the route storage means,
The route output instructing means includes an auto-reroute on mode for automatically starting route guidance based on the re-search result, and a re-search result stored based on the driver's re-search output instruction. And means for selecting an auto reroute off mode for starting route guidance,
When the vehicle is out of the guidance route when the auto reroute off mode is selected, the central processing means outputs the re-searched route stored in the route storage means and outputs the re-searched route according to the driver's re-search instruction. A navigation device for a vehicle, which performs route guidance based on a searched route . A vehicle navigation device that provides route guidance to a destination according to a searched route,
Storage means for storing map information;
A current position detecting means for detecting a current position and a traveling direction of the vehicle; a route for searching for a guidance route from a current position to a destination based on information stored in the storage means and re-searching for a guidance route at regular intervals. Search means;
Route storage means for storing the route searched by the route search means and the route searched again;
Output means for outputting guidance information based on the guidance route;
Central processing means for outputting guidance information to the output means based on the guide route searched by the route search means and the current position detected by the current position detection means,
Route output instructing means for instructing the output of the re-searched route stored in the route storage means,
The route output instructing means includes an auto-reroute on mode for automatically starting route guidance based on the re-search result, and a re-search result stored based on the driver's re-search output instruction. And means for selecting an auto reroute off mode for starting route guidance,
When the auto reroute off mode is selected, the central processing unit outputs the re-searched route stored in the route storage unit and performs route guidance based on the re-searched route in response to a driver's re-search instruction. A navigation device for a vehicle, comprising:

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