JP2011214939A - Navigation system and program thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for presenting useful information for a user even if a navigation system estimates his/her destination to derive a route to the destination and does not display the route.SOLUTION: The navigation system records a day of the week, a time zone, a weather around the system, a route on the way, and the destination (the end point of travel) during from the beginning to the end of a vehicle travel as travel history data in each travel. When travelling without any destination being set by the user, the navigation system estimates the destination based on the degree of coincidence between a day of the week, a time zone, a weather around the system and a route on the way in a current travel, and a day of the week, a time zone, a weather around the system and a route on the way in the travel history data, thereby extracting a candidate of the destination (Step 230). The navigation system then displays an expected arrival time etc. to the candidate of the destination on an image display device without a route display and guidance leading to the extracted candidate of the destination (Step 250).

Description

  The present invention relates to a navigation device and a program for the navigation device.

  A user of a navigation device may not set a destination for a well-known destination. Even in such a case, Patent Document 1 discloses a technique for estimating a user's destination and displaying a route to the destination. Further, Patent Document 1 also describes that since the user often knows the route to the destination well, it is not always necessary to display the destination or the route.

JP 2007-10572 A

  However, even if the display of the route to the destination is suppressed, there is information that is more convenient for the user to display.

  In view of the above points, the present invention provides a technique for estimating a destination, calculating a route to the destination, and presenting information useful to the user even when the route is not displayed. With the goal.

  The invention as set forth in claim 1 for achieving the above-mentioned object comprises an estimation means (230) for estimating a destination of movement and extracting a destination candidate when the user moves without setting a destination. Display control means for displaying the estimated arrival time to the destination candidate or the remaining time to the estimated arrival time on the image display device without displaying the route to the destination candidate extracted by the estimation means (230). (250).

  In this way, the navigation device displays the estimated arrival time (or remaining time) to the destination candidate on the image display device without displaying the route to the extracted destination candidate.

  In most cases, the user does not set the destination due to the inconvenience of setting and being guided to the usual destination. However, I often want to know how long it will take to reach my destination.

  The navigation device of the present invention detects a state running on a known road that the user has started moving even though the user has not set a destination, estimates a destination candidate, By displaying the estimated arrival time of the destination candidate, it is possible to present useful information for the user even when the route to the destination candidate is not displayed.

  Further, the invention according to claim 2 is the navigation device according to claim 1, wherein the display control means (250) is configured such that when the estimation means (230) extracts a plurality of destination candidates, An estimated arrival time at one of the destination candidates is displayed on the image display device, and a predicted arrival time at the one destination candidate based on the user performing a predetermined operation using the operation unit. Instead of this, the estimated time of arrival at another destination candidate among the plurality of destination candidates is displayed on the image display device. In this way, it is possible to perform destination candidate display that is highly convenient for the user.

  The invention according to claim 3 is a program used for a navigation device, and when the user moves without setting a destination, the destination is estimated by extracting the destination candidate of the movement. The image display device displays the estimated arrival time to the destination candidate or the remaining time to the estimated arrival time without displaying the route to the destination candidate extracted by the means (230) and the estimation means (230). As a display control means (250) to be displayed on the program, a program for causing the control circuit of the navigation device to function. Thus, the features of the present invention can also be realized as a program.

  In addition, the code | symbol in the bracket | parenthesis in the said and the claim shows the correspondence of the term described in the claim, and the concrete thing etc. which illustrate the said term described in embodiment mentioned later. .

It is a lineblock diagram of navigation device 1 concerning one embodiment of the present invention. It is a flowchart of the driving | running history preservation | save process which a control circuit performs. It is a figure which shows the structure of driving | running history data. It is a flowchart of a destination estimation display process. It is an example of a display of the estimated arrival time to the destination candidate.

(First embodiment)
FIG. 1 shows a hardware configuration of a vehicle navigation apparatus 1 according to this embodiment. The vehicle navigation device 1 is mounted on a vehicle and includes a position detector 11, an image display device 12, an operation unit 13, a speaker 14, a traffic information receiver 15, a map data acquisition unit 16, and a control circuit 17. Yes.

  The position detector 11 has a well-known acceleration sensor, geomagnetic sensor, gyro sensor, vehicle speed sensor, GPS receiver, and other sensors (not shown), and based on the characteristics of each of these sensors, Information for specifying the position, orientation, and speed is output to the control circuit 17.

  The image display device 12 displays a video based on the video signal output from the control circuit 17 to the user. Examples of the display image include a map centering on the current location.

  The operation unit 13 includes a plurality of mechanical switches provided in the vehicle navigation device 1 and an input device such as a touch panel provided on the display surface of the image display device 12. The user presses the mechanical switch and touches the touch panel. Is output to the control circuit 17.

  The traffic information receiver 15 receives the weather information, traffic jam information, traffic regulation information, etc. of each point wirelessly transmitted from an FM radio broadcasting station or a roadside device installed along the road, and outputs to the control circuit 17 Machine.

  The map data acquisition unit 16 includes a nonvolatile storage medium such as a DVD, a CD, and an HDD, and a device that reads data (and writes data if possible) to the storage medium. The storage medium stores a program executed by the control circuit 17, map data for route guidance, and the like.

  The map data has road data and facility data. Road data includes, for each of a plurality of nodes (intersections, branch points, etc.), node IDs for identifying individual nodes, node position information, node names (intersection names, interchange names, etc.), and node types. Information, and for each of a plurality of links (road sections connecting nodes), link IDs for identifying individual links, link position information, node names (national road names, highway names, Prefectural road name, etc.) and node type information, and information on the connection relationship between nodes and links. The facility data has a plurality of records for each facility, and each record has data indicating information on the name of the target facility, location location information, land lot number information, facility type information, etc. is doing.

  A control circuit (corresponding to a computer) 17 is a microcomputer having a CPU, RAM, ROM, flash memory, I / O, and the like. The CPU executes a program for the operation of the vehicle navigation device 1 read from the ROM or the map data acquisition unit 16, reads information from the RAM, the ROM, and the map data acquisition unit 16 when executing the program. , Flash memory, and (if possible) writing information to the storage medium of the map data acquisition unit 16, position detector 11, image display device 12, operation unit 13, speaker 14, and traffic information receiver 15 exchanges signals.

  Specific processing performed by the control circuit 17 executing the program includes current position specifying processing, map display processing, guidance route calculation processing, route guidance processing, and the like.

  The current position specifying process is a process for specifying the current position and direction of the vehicle based on a signal from the position detector 11 using a known technique such as map matching. It is assumed that the current position of the vehicle to be specified later is specified by this current position specifying process.

  The map display process is a process for causing the image display device 12 to display a map of a specific area such as the vicinity of the current position of the vehicle. At this time, information used for map display is acquired from the map data.

  The guidance route calculation process receives a destination setting by the user from the operation unit 13, records the set destination as set destination data in the RAM, and from the current position to the destination in the set destination data. This is a process for calculating the optimum guide route. The set destination data is obtained when the user operates the operation unit 13 to cancel the destination setting, or when the vehicle reaches the destination in the set destination data. The data is erased from the RAM when the power is turned off.

  In the route guidance process, when the vehicle arrives before a guidance point such as a right-left turn intersection on the guidance route, a guidance voice instructing right turn, left turn, etc. is output to the speaker 14 and This is a process of guiding the driving of the vehicle along the guidance route by being displayed on the image display device 12.

  In addition to these processes, the control circuit 17 executes a travel history storage process and a destination estimation display process by executing a predetermined program.

  First, the travel history saving process will be described. The travel history storage process is a process of accumulating various conditions (day of the week, time, weather, route on the way) during travel from the departure point of the vehicle to the destination in association with the destination. FIG. 2 shows a flowchart of the travel history storing process.

  The control circuit 17 starts to execute the processing of FIG. 2 together with the start of the operation of the vehicle navigation device 1. First, in step 110, it is determined whether or not the vehicle has started running. Specifically, when the vehicle start switch (that is, the ignition switch or the main power switch) is turned on, it is determined that the vehicle has started traveling. Otherwise, the vehicle has started traveling. Judge that there is no. If the vehicle has not started running, step 110 is executed again. If it is determined that the vehicle has started running, step 120 and the subsequent steps are executed.

  In step 120 after starting the travel, the vehicle waits until the vehicle reaches the travel position recording point, and when the travel position recording point is reached, the node ID corresponding to the current position of the vehicle at that time (or the latitude and longitude of the current position). ) In the RAM. Whether or not the vehicle has reached the travel position recording point is determined by whether or not the vehicle has reached any node in the map data. In this case, each node corresponds to a travel position recording point.

  Subsequently, in step 130, it is determined whether or not the vehicle has finished traveling. Specifically, when the start switch of the vehicle is turned off, it is determined that the vehicle has finished traveling, and otherwise, it is determined that the vehicle has not finished traveling. If the vehicle has not finished running, step 120 is executed again.

  Therefore, the control circuit 17 records the current position of the vehicle at that time in the RAM every time the vehicle reaches the travel position recording point from when the vehicle starts to travel until it ends. Therefore, a plurality of travel position recording points through which the vehicle has passed are stored in the RAM in the order of travel.

  If it is determined in step 130 that the travel has ended, then in step 140, the travel history data is recorded in the flash memory or the storage medium of the map data acquisition unit 16. FIG. 3 shows the configuration of the travel history data recorded here.

  As shown in this figure, the travel history data includes information of five items, such as day of the week, time zone, weather, midway route, and destination. As information on the item of the day of the week and the time zone, information on the day of the week and the time zone to which the time when it is determined that the travel starts at Step 110 (or the time when it is determined that the travel ends at Step 130) respectively is employed. Here, the time zone refers to each period (for example, from 18:00 to 21:00) that can be obtained as a result of dividing a period of one day into a plurality (for example, six).

  As the weather item information, the weather information at the current position of the vehicle at the time when it is determined that the vehicle has started traveling at step 110 (or when it is determined that the vehicle has ended traveling at step 130) is adopted. This information is acquired from the traffic information receiver 15. As the route information, information of a plurality of travel position recording points accumulated in the RAM from the time when it is determined that the travel is started at Step 110 to the time when the travel is determined at Step 130 is adopted. As the destination information, the current position of the vehicle at the time when it is determined in step 130 that the vehicle has finished traveling is adopted. After the end of step 140, all of the plurality of travel position recording points stored in the RAM are deleted, and the process returns to step 110 to wait for the start of the next travel.

  By executing the travel history storing process executed by such a control circuit, the vehicle navigation device 1 causes the day of the week and time during travel from the start of travel to the end of travel every time the vehicle starts to travel and ends. The belt, the weather of the vehicle position, and the route on the way are associated with the destination in the travel (that is, the travel end point) and recorded as travel history data in the flash memory or the storage medium of the map data acquisition unit 16.

  Next, the destination estimation display process will be described. In the destination estimation display process, based on a plurality of travel history data recorded by the travel history storage process, the destination is estimated spontaneously without receiving a destination setting operation by the user, and the estimated destination is displayed. This is a process of notifying the user of the estimated arrival time. FIG. 4 shows a flowchart of the destination estimation display process.

  The control circuit 17 starts executing the processing of FIG. 4 when the operation of the vehicle navigation device 1 is started. Therefore, the control circuit 17 performs this destination estimation display process simultaneously with the above-described travel history storage process.

  In this destination estimation display process, the control circuit 17 first determines in step 210 whether or not the vehicle has started running, as in step 110 of FIG. 2, and if it has not started running, executes step 210 again. If the vehicle starts to travel, step 220 is executed.

  In step 220, whether or not the destination is set by the user is determined by whether or not the set destination data is recorded in the RAM. If the destination has been set, the process returns to step 210 again. If the destination has not been set, the process proceeds to step 230.

  In step 230, the destination of the vehicle is estimated based on the travel history data saved by the travel history saving process.

  Specifically, the day of the week and the time zone to which the time point (or the current time) determined to start traveling in step 210 belongs are specified, and the weather of the vehicle position at the time point is specified. The identified day of the week, time zone, and weather are referred to as the current day of the week, current time zone, and current driving weather.

  Further, the travel position recording point through which the vehicle has passed from the time when it is determined in step 210 that the travel has started is specified as the current halfway route. As the current halfway route, a plurality of travel position recording points stored in the RAM by the travel history saving process at that time are used.

  Then, the identified current driving day, the current driving time zone, the current driving weather, the current midway route, and each driving history data recorded in the storage medium of the flash memory or the map data acquisition unit 16 are compared and matched. The degree P is calculated.

  The coincidence P between the current travel day, the current travel time zone, the current travel weather, and the current midway route and one travel history data is calculated by the following formula.

P = k1 * T1 + k2 * T2 + k3 * T3 + k4 * T4
Here, k1, k2, k3, and k4 are predetermined coefficients. The value of T1 is 1 if the current day of the week and the day of the week in the running history data match, and zero if they do not match. The value of T2 is set to 1 if the current travel time zone and the time zone in the one travel history data match, and set to zero if they do not match. The value of T3 is set to 1 if the current traveling weather and the weather in the one traveling history data match, and zero if they do not match. The value of T4 is the number of points that coincide when the traveling position recording points in the current halfway route and a plurality of traveling position recording points in the one traveling history data are compared.

  Therefore, the coefficient k1 corresponds to the weight score assigned to the day of the week match, the coefficient k2 corresponds to the weight score assigned to the time zone match, and the coefficient k3 corresponds to the weight score assigned to the weather match. The coefficient k4 corresponds to the number of weight points assigned to coincidence of one traveling position recording point. In the present embodiment, k1 = 100, k2 = 100, k3 = 20, and k4 = 3 are employed as the values of the respective coefficients.

  Then, based on the coincidence P calculated for each travel history data, a destination in the travel history data in which the coincidence P is higher than a reference value Pt (for example, a specific value within a range from 250 to 280), Extract as destination candidates. In this way, the destination estimation ends. The number of destination candidates extracted here may be one, may be plural, or may be zero.

  Subsequently, in step 240, for each of the destination candidates adopted in step 230, a route from the current position to the destination candidate is calculated, and the travel time from the current position along the calculated route to the destination candidate is calculated. And the estimated arrival time at the destination candidate is calculated based on the travel time.

  The route from the current position calculated here to the destination candidate may be calculated using the Dijkstra method or the like regardless of the intermediate route in the travel history data from which the destination candidate is extracted, Alternatively, the route from the current position to the destination candidate may be calculated using the midway route.

  As a method of using the intermediate route, for example, if the current position is on the intermediate route (that is, on a node on the intermediate route or a link having both nodes at both ends), The part from the current position to the destination may be a route from the current position to the destination candidate. If the current position is not on the halfway route, the first route from the current position to the nearest halfway route is calculated using the Dijkstra method or the like, and the end point of the first route among the halfway routes is calculated. A portion from the destination to the destination may be a second route, and a route connecting the first route and the second route may be a route from the current position to the destination candidate.

  The travel time from the current position along the calculated route to the destination candidate may be calculated on the assumption that the vehicle travels at a predetermined constant speed (for example, 30 kilometers per hour). Good.

  Subsequently, in step 250, the image display device 12 is caused to display one of the predicted arrival times at each destination candidate calculated in step 240 with the highest degree of coincidence P.

  FIG. 5 shows a display example of the estimated arrival time at the destination candidate. In the example of this figure, a map including the vehicle position mark 21 is displayed on the display screen 20 of the image display device 12, and an expected arrival time display 22 is superimposed on the map.

  This estimated arrival time display 22 is arranged away from the center of the display screen 20 and near the end so as not to disturb the map display. The expected arrival time display 22 displays the name of the destination candidate, the expected arrival time at the destination candidate, and the remaining distance from the current position along the route to the destination candidate. It has become.

  As for the name of the destination candidate, if there is a facility whose location range includes the position of the destination candidate in the facility data of the map data, the name of the facility is adopted as the name of the destination candidate. If there is no facility that includes the location of the destination candidate in the location range in the facility data of the map data, the latitude and longitude of the location of the destination candidate may be displayed as the name of the destination candidate.

  Alternatively, if there is no facility that includes the position of the destination candidate in the location range in the facility data of the map data, based on the travel history data from which the destination candidate is extracted, The name of the destination candidate is created using information on items that match the current driving day of the week, current driving time zone, current driving weather, and driving position recording points on the current route, and the generated name is displayed. You may come to do.

  For example, if the information of the item of the day of the week and the time zone in the travel history is the same as the current day of the week and the current time zone, the text “A place where you have been at X time from △ on the day of the week” A string may be created and the character string may be adopted and displayed as the name of the destination candidate.

  In addition, you may employ | adopt and display as a name of the said destination candidate the character string produced as mentioned above, and the thing including both the latitude and the longitude of the position of the said destination candidate.

  In addition, the display of the estimated arrival time to the destination candidate in the estimated arrival time display 22 includes both an analog clock format display and a digital clock format display.

  The expected arrival time display 22 further includes a next candidate button 22a, a delete button 22b, and a confirmation button 22c that are displayed so as to be selectable by the user using the operation unit 13.

  The next candidate button 22a is a button for toggling a destination candidate to be displayed. When the user performs a predetermined operation for selecting the next candidate button 22a using the operation unit 13, the control circuit 17 replaces the currently displayed destination candidate with the degree of matching next to the destination candidate. The name of the destination candidate having a high P, the estimated arrival time, and the remaining distance are displayed in the estimated arrival time display 22.

  However, when the currently displayed destination candidate is the destination candidate with the lowest matching degree P, the control circuit 17 replaces the currently displayed destination candidate with the highest matching degree P. Are displayed in the estimated arrival time display 22. By doing in this way, according to selection of the next candidate button 22a by the user, the destination candidates are cyclically displayed one by one in order of the matching degree P.

  The delete button 22b is a button for deleting the estimated arrival time display 22. When the user performs a predetermined operation for selecting the delete button 22b using the operation unit 13, the control circuit 17 deletes the display of the estimated arrival time display 22.

  The confirmation button 22c is a button for confirming the currently displayed destination candidate as the destination. When the user performs a predetermined operation for selecting the confirmation button 22c using the operation unit 13, the control circuit 17 ends the destination estimation display process, and then selects the currently displayed destination candidate. And the route from the current position to the destination is calculated, the image display device 12 is controlled to display the route on the map, and guidance for right and left turns along the route is started.

  Following step 250, it is determined in step 260 whether or not the vehicle has been driven in the same manner as in step 130 of FIG. If the vehicle has not finished traveling, the process returns to step 230 again to estimate the destination again. By doing in this way, destination estimation is repeatedly performed with advancing of a vehicle, and the newest destination candidate extracted each time can be shown to a user. If it is determined in step 260 that the travel has ended, the destination estimation display process ends.

  Here, an example of the operation of the vehicle navigation apparatus 1 during execution of the destination estimation process will be shown. In this example, in the calculation formula for the degree of coincidence P, the coefficients k1, k2, k3, and k4 are 100, 100, 20, and 3, respectively, and the threshold value Pt is 250.

  First, when the vehicle starts traveling in a situation where the destination is not set, the control circuit 17 repeatedly performs destination estimation, and displays the name of the destination candidate, the estimated arrival time, and the remaining distance extracted thereby. (Refer to Steps 230 to 260).

  Immediately after the vehicle starts traveling, the number of traveling position recording points in the current halfway route recorded in the RAM is small. Therefore, in the degree of coincidence P of each traveling history data calculated in step 230, k4 × T4 The value is smaller than the value of k1 × T1 + k2 × T2 + k3 × T3. Therefore, whether or not the day of the week, the time zone, and the weather coincide with the current travel greatly contributes to the matching degree P of the travel history data.

  However, even if the day of the week, the time zone, and the weather at the time of traveling coincide with the current traveling, the value of k1 × T1 + k2 × T2 + k3 × T3 is 220, so the threshold value Pt = 250 is not reached. Accordingly, for a while after the start of traveling, the number of destination candidates extracted is zero, and therefore the destination candidates are not displayed on the image display device 12.

  When the vehicle travels to some extent (for example, 30 travel position recording points) from the start of travel, as a result of the k4 × T4 term becoming somewhat large, travel history data exceeding the threshold Pt = 250 also appears. However, since the k4 × T4 term alone does not reach the threshold value Pt = 250, the destination candidate is extracted from any of the travel history data whose day of the week and time zone coincide with the current travel. Become. For example, if the current time is from 6am to 9am on weekdays, follow the same route as that of the work facility frequently used on that day of the week and follow the 17 travel position recording points, The degree of coincidence of the travel history as the destination exceeds the threshold value Pt, and the expected arrival time at the work facility is displayed.

  When the vehicle has traveled sufficiently (for example, 100 travel position recording points) from the start of travel, travel history data exceeding the threshold Pt = 250 can appear even with the term k4 × T4 alone.

In such a situation, for example, even if the user accidentally goes to a large commercial facility that has been on a Saturday, Sunday afternoon, from 6:00 am to 9:00 am on a weekday,
While the mileage is short, the estimated arrival time of the work facility that is frequently visited during the time zone on weekdays is displayed, but if the mileage exceeds a certain distance, the travel history for the large commercial facility matches The destination is higher than the degree of coincidence of the travel histories with the work facility as the destination, and the destination where the estimated arrival time is preferentially displayed is switched from the work facility to the large commercial facility.

  As described above, the vehicle navigation device 1 according to the present embodiment has the day of the week, the time zone, the weather around the own device, the route on the way, and the destination (travel end point) during travel from the start of travel of the vehicle to the end of travel. ) Is recorded as travel history data for each travel.

  When the user travels without setting a destination, the destination is estimated based on the degree of coincidence P between the current travel and the travel history data, and the destination candidates are extracted. The estimated time of arrival to the destination candidate is displayed on the image display device 12 without displaying the route to the candidate and providing guidance (voice guidance, enlarged intersection display, etc.).

  In most cases, the user does not set the destination due to the inconvenience of setting and being guided to the usual destination. However, I often want to know how long it will arrive.

  In the present embodiment, the navigation device 1 has a function of storing a traveling pattern of a vehicle and a function of calculating a route to the destination and a predicted arrival time of the destination, and for a destination that has been said in the past. Thus, even if the user does not perform the destination setting operation, the estimated arrival time is provided to the user.

  Thus, the vehicular navigation device 1 of the present embodiment detects a state running on a known road that the user has started driving even though the user has not set a destination, By displaying the estimated arrival time of the destination estimated from the past travel history data, it is possible to present useful information for the user even when the route to the destination is not displayed.

  In the above embodiment, the control circuit 17 functions as an estimation unit by executing Step 230, and functions as a display control unit by executing Step 250.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, the scope of the present invention is not limited only to the said embodiment, The various form which can implement | achieve the function of each invention specific matter of this invention is included. It is.

  For example, in the above embodiment, in step 250 of FIG. 4, the predicted arrival time for one of the destination candidates calculated in step 240 having the highest degree of matching P is displayed on the image display device 12. However, this is not necessarily the case. For example, among the destination candidates, the destination candidate names and the estimated arrival times from the highest matching score P to the top five may be displayed on the image display device 12 at the same time. In that case, for example, a list display format may be adopted as the display format.

  At that time, a delete button may be displayed along with each of the estimated arrival times of the destination candidates displayed at the same time. In this case, when the user selects the delete button displayed along with the estimated arrival time of a certain destination candidate using the operation unit 13, the control circuit 17 deletes the display of the estimated arrival time of the destination candidate. Instead, the estimated arrival time of the destination candidate having the next highest match may be displayed.

  In the above-described embodiment, the vehicle navigation device 1 displays the day of the week, the time zone, the weather, the route, and the destination (travel end point) during travel from the start of travel of the vehicle to the end of travel. However, in addition to these, the direction from the start point to the destination (end point) (direction about east, west, north, and south) should be included as the travel history data to be recorded. It may be.

  In this case, when the vehicle navigation device 1 travels without setting a destination by the user, P = k1 × T1 + k2 × T2 + k3 × T3 + k4 × T4 in calculating the degree of coincidence P between the current travel and travel history data. The following formula may be adopted. At this time, the value of T2 is 1 if the difference between the direction from the travel start point to the current position in the current travel and the direction in the one travel history data is within a predetermined error, and is greater than the predetermined error. Zero if it is far away.

  Moreover, in step 120 of FIG. 2, the vehicle navigation apparatus 1 determines whether or not the vehicle has reached the node of the travel position record. However, this is not necessarily the case. For example, whether or not the vehicle has reached a travel position recording point may be determined by whether or not the vehicle has traveled a predetermined distance (for example, 50 meters). In this case, the travel position recording point to be recorded as the midway route may be a node ID to which the travel position recording point belongs, or may be a position coordinate of the travel position recording point.

  In the above embodiment, the day of the week, the time zone, the weather of the vehicle position, and the route on the way are used as information items used when estimating the destination, but one of these information items is used. Only one (or any two or three) may be compared with each movement history data, and a destination candidate may be estimated based on their matching degree P.

  Further, in the above embodiment, when estimating the destination, the day of the week, the time zone, the weather of the vehicle position, and the route on the current movement, the route, the day of the movement history data, the weather of the vehicle position, the route on the way The destination candidate is estimated based on the degree of coincidence P, but the method for estimating the destination is not limited to such a method.

  For example, as described in Patent Document 1, user information (age, occupation) and short-term change situation information (time zone, day of the week, presence / absence of passengers) are input to the Bayesian network model, Determine the likelihood of the target, and further input the target and situation information into the Bayesian network model to determine the likelihood of each destination, and set destination candidates based on the determined likelihood of each destination It may be like this.

  Or, more simply, based on the map data, a predetermined large-scale facility (station, large commercial facility, large leisure resort, etc.) within a predetermined distance (for example, 20 km) from the current position of the host vehicle is selected as a destination candidate. You may come to do.

  In the above embodiment, the same effect can be obtained by replacing the display of the estimated arrival time up to the destination candidate with the remaining time from the present time up to the estimated arrival time.

  In the above embodiment, each function realized by the control circuit 17 executing the program is realized by using hardware having those functions (for example, an FPGA capable of programming the circuit configuration). You may come to do.

  In addition, the navigation device of the present invention does not necessarily have to be a vehicle-mounted one. For example, the navigation device may be of a type carried by the user. When the navigation device is used without being mounted on a vehicle, “travel” in the above embodiment may be replaced with “movement”. At this time, whether or not the movement has been started may be determined based on whether or not the user has performed a movement start operation, and whether or not the movement has been completed may be determined based on whether or not the user has performed a movement end operation. .

DESCRIPTION OF SYMBOLS 1 Vehicle navigation apparatus 11 Position detector 12 Image display apparatus 13 Operation part 14 Speaker 15 Traffic information receiver 16 Map data acquisition part 17 Control circuit 20 Display screen 21 Own vehicle position mark 22 Expected arrival time display 22a Next candidate button 22b Deletion Button 22c Confirm button

Claims (3)

Estimating means (230) for estimating a destination of the movement and extracting a destination candidate when the user moves without setting the destination;
Display control means for causing the image display device to display the estimated arrival time to the destination candidate or the remaining time to the estimated arrival time without displaying the route to the destination candidate extracted by the estimation means (230). 250).   The display control means (250), when the estimation means (230) extracts a plurality of destination candidates, causes the image display device to display an estimated arrival time for one of the plurality of destination candidates, Based on the fact that the user has performed a predetermined operation using the operation unit, instead of the estimated arrival time at the one destination candidate, the predicted arrival at the other destination candidate among the plurality of destination candidates The navigation device according to claim 1, wherein the time is displayed on the image display device. A program used in a navigation device,
When the user moves without setting the destination, the estimation means (230) for estimating the destination of the movement and extracting the destination candidate, and the route to the destination candidate extracted by the estimation means (230) A program for causing the control circuit of the navigation device to function as display control means (250) for causing the image display device to display the estimated arrival time to the destination candidate or the remaining time to the estimated arrival time without performing display. .

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