JP4186547B2 - Navigation device and computer program - Google Patents

Navigation device and computer program Download PDF

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Publication number
JP4186547B2
JP4186547B2 JP2002231582A JP2002231582A JP4186547B2 JP 4186547 B2 JP4186547 B2 JP 4186547B2 JP 2002231582 A JP2002231582 A JP 2002231582A JP 2002231582 A JP2002231582 A JP 2002231582A JP 4186547 B2 JP4186547 B2 JP 4186547B2
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Prior art keywords
estimated
required time
error
estimated required
time
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JP2004069609A (en
Inventor
圭一 木村
裕記 石川
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株式会社エクォス・リサーチ
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a navigation device and a computer program.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there are computer programs related to navigation devices and navigation functions that search for a destination desired by a user and search for a route from the departure point to the destination for guidance. Some of these navigation devices estimate and display the required time when it is assumed that the vehicle has traveled to the destination along the searched route after the route search, or the arrival time to such a destination Some of them have a function to estimate and display.
[0003]
[Problems to be solved by the invention]
However, although the required time and arrival time displayed by such a navigation device or the like are estimated based on a predetermined estimation calculation process, for the user, how much the displayed required time or arrival time is It was impossible to determine whether it was reliable, and it was only an approximate guide. For this reason, it is difficult to determine whether the actual required time is shorter or longer than the displayed required time or arrival time. On the other hand, there is a problem that it is impossible to predict how much the actual time may vary.
[0004]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a navigation device and a computer program capable of presenting a user with a degree of reliability for an estimated required time to a destination. There is.
It is another object of the present invention to provide a navigation device and a computer program that can present to a user a degree of reliability with respect to an estimated arrival time arriving at a destination.
[0005]
[Means for solving the problems and functions and effects of the invention]
  In order to achieve the above object, in the navigation device according to claim 1, in the navigation device that searches for a recommended route from the departure point to the destination and provides guidance, an estimated required time required when the searched recommended route is advanced is calculated. Estimated required time calculating means for estimating and calculating, estimated error calculating means for estimating and calculating an estimated error of the estimated required time, the recommended route, and the estimated required time,The estimation errorA direction in which the range of the estimated required time increases due to the estimation error and a direction in which the range of the estimated required time decreases due to the estimation errorAnd a display control means for displaying on a display device.
[0006]
  In the first aspect of the invention, the estimated required time required when the searched recommended route is traveled is estimated by the estimated required time calculating means, and the estimated error of the estimated required time is estimated by the estimated error calculating means. The recommended route and estimated time required by the display control means,Estimation errorDirection in which estimated time range increases due to estimation error and direction in which estimated time range decreases due to estimation errorIs displayed on the display device. As a result, the recommended route from the departure point to the destination, the estimated required time to the destination, and the estimated error in the required timeAnd the direction in which the estimated time range increases or decreases due to estimation errorsCan be displayed on the display device, so that the user can obtain the reliability of the estimated required time from the estimation error. By displaying the estimated error with respect to the estimated required time, the user of the navigation device can make a schedule after arrival in anticipation of the time error with respect to the estimated required time.Further, the estimated required time and the estimated fluctuation range can be grasped directly visually.
[0007]
  Further, in the navigation device according to claim 2, the navigation device according to claim 1, further comprising a timing device that acquires a current time, wherein the display control unit is configured to perform the timing in place of or in addition to the estimated required time. The estimated arrival time obtained by adding the estimated required time to the current time acquired by the deviceGraphic display of an analog clock with hour and minute handsDisplay on the display deviceIn addition, the range of the estimated required time is increased by a fan-shaped range that extends in a clockwise direction from the minute hand in a fan shape that overlaps with the display of the analog timepiece around the rotation axis of the minute hand that represents the estimated arrival time. The direction of the estimation and the magnitude of the estimation error corresponding to the increment are displayed, and the direction of the estimated required time is reduced by the fan-shaped range that opens counterclockwise from the minute hand and corresponds to the decrease. Display the size of the estimation errorThis is a technical feature.
[0008]
  In the invention according to claim 2, the display control means displays the estimated arrival time obtained by adding the estimated required time to the current time obtained by the time measuring device instead of or in addition to the estimated required time in a graphic display of the analog timepiece by the hour hand and the minute hand. The range of the estimated required time is determined by the fan-shaped range that opens in the clockwise direction from the minute hand in a fan shape that overlaps the analog clock display centering on the rotation axis of the minute hand that represents the estimated arrival time. The direction of increase and the size of the estimated error corresponding to the increment are displayed, and the estimated error time corresponding to the direction in which the estimated time is reduced due to the fan-shaped range that opens counterclockwise from the minute hand and the estimated error Display the size. As a result, instead of or in addition to the estimated required time, the estimated arrival time is displayed on the display device in a graphic display of the analog clock, and the estimated error and the direction in which the estimated required time range increases or decreases due to the estimated error are displayed. By displaying on the display device in a fan shape that overlaps with the display, the user of the navigation device can obtain the reliability for the estimated arrival time from the estimation error, and more visually and directly The estimated fluctuation range can be grasped.
  Furthermore, in the navigation device of claim 3, ContractThe navigation device according to claim 1, wherein the display control means is,in frontEstimated time requiredWhenDisplayed on the display device with a graphic display of a digital clock with numbers and minutes,in frontThe direction of the estimated required time increases and the size of the estimated error corresponding to the increment is displayed by the “+” sign displayed at the superscript position on the right side of the digital clock and the minute number.,in frontA technique for displaying a direction in which the range of the estimated required time decreases and a magnitude of the estimated error corresponding to the decreased amount by a “−” symbol and a fractional number displayed at a right subscript position of the digital clock. Characteristic.
  In the invention of claim 3, the display control means is,Estimated travel timeWhenIn addition to displaying on the display device a digital clock graphic display with numbers and minutes,The direction of the estimated required time is increased and the size of the estimated error corresponding to the increment is displayed by the “+” sign and the minute number displayed at the upper right position of the digital clock.,The direction in which the estimated required time range decreases and the magnitude of the estimated error corresponding to the decreased amount are displayed by the “−” symbol and the minute number displayed at the right subscript position of the digital clock. As a result, estimated time requiredBetween“+” Sign and fractional number displayed on the right-hand superscript position of the digital clock indicating the estimated error and the direction in which the estimated required time range will increase or decrease due to the estimated error, as well as the graphic display of the digital clock And a “−” symbol and a fractional number displayed at the right subscript position, the user of the navigation device canEstimated travel timeCan be obtained more visually and directlyTime requiredAnd its estimated fluctuation range.
  Furthermore, in the navigation device according to claim 4, the navigation device according to any one of claims 1 to 3, wherein a plurality of recommended routes from the departure point to the destination are searched, wherein the estimated required time calculation means includes The estimated required time is calculated for each of a plurality of searched recommended routes, the estimation error calculating means calculates an estimated error of the estimated required time for each of the searched recommended routes, and the display control means is The estimated required time for each of the plurality of recommended routes, the estimated error for each of the plurality of recommended routes, and a direction in which the range of the estimated required time increases due to the estimated error and the estimated error A technical feature is that a direction in which the range of the estimated required time decreases is displayed on a display device.
  In the invention of claim 4, the estimated required time calculating means calculates the estimated required time for each of the searched plurality of recommended routes, and the estimation error calculating means estimates the estimated required time for each of the searched plurality of recommended routes. The display control means calculates the error, and the display control means calculates a plurality of recommended routes, an estimated required time for each of the recommended routes, an estimated error for each of the recommended routes, and a direction and an estimated error in which the estimated required time range increases due to the estimated error. As a result, the direction in which the range of the estimated required time decreases is displayed on the display device. Thereby, for a plurality of recommended routes obtained by the route search, the estimated required time of each recommended route, its error range, and its increase / decrease direction are displayed on the display device. When selecting one route from a plurality of recommended routes, it is possible to select in consideration of the certainty of the required time.
  For example, the recommended routes A and B are searched, and even if the required time for both routes is 1 hour 30 minutes, the error of the route A (eg, the range of required time with a probability of 90%) is ± 10 minutes, If the error of route B is set to ± 60 minutes, when you want to get information on the required time as surely as possible and prepare for the next action, you can prepare for the risk of taking more time, and more time. Then, when it is desired to expect the possibility of arrival early, there is an effect that the reason for route selection can be clearly specified such as selecting route B.
[0009]
  And claims5The navigation device according to claim 1 is mounted on a vehicle.Any one of -4The estimated travel time calculating means is the navigation device according to claim 1,"Traffic information obtained from outside the vehicleNewsOr"Vehicle traveling speed"The estimated required time is estimated and calculated based on"Traffic information obtained from outside the vehicleNewsOr"Vehicle traveling speed"It is a technical feature that the estimation error is calculated based on
[0010]
  Claim5In the present invention, the estimated required time calculating means is:"Traffic information obtained from outside the vehicleNewsOr"Vehicle traveling speed"Based on the above, the estimated required time is estimated and calculated."Traffic information obtained from outside the vehicleNewsOr"Vehicle traveling speed"An estimation error is calculated based on This"Traffic information obtained from outside the vehicleInformation "or"Vehicle traveling speed"Since the estimated required time or estimation error is calculated based on the above, it is possible to display the estimated required time and estimation error in accordance with the road traffic situation on the display device. Therefore, the user can obtain higher reliability with respect to the estimated required time.
[0011]
  Furthermore, the claims6In the navigation device of claimIn any one of 1-5In the described navigation apparatus, the estimated required time calculating means and / or the estimated error calculating means estimates the estimated arrival time and / or the estimated error at predetermined intervals, and calculates the estimated arrival time and / or estimated previously calculated. A technical feature is that it comprises a notification means for notifying a user that a result different from the previous one is calculated when a result different from the error is calculated. Here, “notification means” means display on a display device or sound output through a speaker.
[0012]
  Claim6In this invention, the estimated arrival time and / or estimation error is periodically calculated, and when the result different from the previous calculation result is obtained, the user can be notified of the fact. It is possible to immediately know that the estimated arrival time and / or the reliability with respect to the estimated arrival time has fluctuated for some reason during the progress.
[0013]
  Claims7In the navigation device of claim 1,6In the navigation device according to any one of the preceding claims, the estimation error calculated by the estimation error calculation unit is an estimate that is greater than or equal to a predetermined probability with respect to the estimated required time calculated by the estimated required time calculation unit. It is a technical feature that it is the maximum value and minimum value of the required time.
[0014]
  Claim7In this invention, since the estimation error is the maximum value and the minimum value of the estimated required time that is equal to or higher than a predetermined probability with respect to the estimated required time, the estimated required time and the estimated error can be calculated with higher accuracy. . Thereby, the user of the navigation device can obtain higher reliability with respect to the estimated required time.
[0018]
  In order to achieve the above object, the claims8This computer program searches for a recommended route from the starting point to the destination and outputs guidance information. Estimated estimated time required for calculating the estimated required time required to travel the searched recommended route is calculated. Means, an estimation error calculating means for estimating and calculating an estimation error of the estimated required time,And, Recommended route, estimated time,The estimation errorA direction in which the range of the estimated required time increases due to the estimation error and a direction in which the range of the estimated required time decreases due to the estimation errorIt is a technical feature that a program for functioning as an output means for outputting the program.
[0019]
  Claim8In the invention, the estimated required time required when the searched recommended route is traveled is estimated and calculated by the estimated required time calculating means, the estimated error of the estimated required time is estimated and calculated by the estimated error calculating means, and output By means,Recommended route, estimated time,Estimation errorDirection in which estimated time range increases due to estimation error and direction in which estimated time range decreases due to estimation errorIs output. As a result, the recommended route from the departure point to the destination, the estimated required time to the destination, and the estimated error in the required timeAnd the direction in which the estimated time range increases or decreases due to estimation errorsTherefore, the user can obtain the reliability for the estimated required time from the estimation error. And the estimation error for the estimated timeAnd the direction in which the estimated required time range increases or decreasesWith this output, the user of the computer can make a schedule after arrival in anticipation of a time error with respect to the estimated required time. Claims8By implementing the computer program described in the above in a computer in an information center that provides traffic information and route information to users' terminals through telecommunication circuits, it is possible to provide services by the program to many terminals users. It becomes possible.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which a navigation device and a computer program of the present invention are applied to a navigation device of a type mounted on a vehicle will be described with reference to FIGS.
[0021]
First, the configuration of the navigation device of the present embodiment will be described with reference to FIG.
As shown in FIG. 1, the navigation device 20 mainly includes a CPU 21, a memory 22, a map information database 23, an input / output interface 24, an input device 25, a display 26, a GPS sensor 31, a vehicle speed sensor 32, a gyro sensor 33, It is comprised from the communication apparatus 35 grade | etc.,.
[0022]
The CPU 21 is a central processing unit that controls the navigation device 20, and is connected to a memory 22, a map information database 23, an input / output interface 24, and the like via a system bus. In addition to the system program 22a for controlling the CPU 21, the memory 22 stores various control programs 22b to 22g. The CPU 21 reads these programs from the memory 22 and executes them sequentially. The CPU 21 has a built-in clock 21a having a function of measuring the current time.
[0023]
The memory 22 is a storage device connected to the system bus, and constitutes a main storage space used by the CPU 21. The memory 22 includes a system program 22a, an input program 22b that enables input of information from the input device 25, a route search program 22c that assumes a navigation function that is a basic function of the navigation device 20, and an information center 70 that will be described later. A traffic information acquisition program 22d having a function of acquiring traffic information from the travel time, a required time calculation program 22e and an error calculation program 22f having a function of calculating a required time required for traveling (advancing) the recommended route searched for, and A drawing program 22g having a function of controlling display of a recommended route, a required time, and the like is written in advance on the display 26.
[0024]
The map information database 23 is a hard disk, a compact disk, a digital versatile disk, or the like that constitutes an auxiliary storage space used by the CPU 21, and is connected to the CPU 21 via a system bus. The map information database 23 stores map information searched as road information. “Road information” refers to various types of information such as topography of roads and rivers, road widths, traffic directions, speed restrictions, and the like. The map information database 23 may store road traffic information corresponding to traffic information to be acquired from the information center 70.
[0025]
The input / output interface 24 is a device that mediates the exchange of data between the CPU 21 and the input / output device such as the input device 25, the display 26, the GPS sensor 31, the vehicle speed sensor 32, the gyro sensor 33, and the communication device 35, and the system bus. It is connected to the.
[0026]
The input device 25 is an input device provided on the operation panel of the navigation device 20, and is connected to the system bus via the input / output interface 24. The input device 25 is for inputting information on a destination or the like that the user desires to search for a route through the input program 22b. In general, a configuration in which a predetermined number of push-type switches are arranged is adopted. However, a navigation device that recognizes a touch panel type provided on the surface of the display 26 or a user's voice in consideration of simplification of input operation. Some of them are composed of a microphone and a voice recognition device that converts the information into input information to 20.
[0027]
The display 26 is a display device that can output route guidance information from the current location to the destination and an estimated required time or arrival time required to arrive at the destination via the drawing program 22g, and is an operation panel of the navigation device 20. Is provided. The display 26 is also connected to the system bus via the input / output interface 24, and is constituted by, for example, a liquid crystal display or a CRT display. Some display screens include a touch panel constituting the input device 25.
[0028]
In this embodiment, the input device 25 and the display 26 are provided on the operation panel of the navigation device 20. However, the present invention is not limited to this, and the input device 25 and the navigation device 20 are provided in a separate housing. The display 26 may be configured. Alternatively, the input device 25 and the display 26 may be physically separated from each other. Further, the navigation device of the present embodiment includes a speaker (not shown) in addition to the display as an output device. From the speaker, route guidance, traffic information, estimated arrival time, and the like are output by voice, and various information is notified to the user.
[0029]
The GPS sensor 31 is for outputting the current position data of the vehicle according to longitude and latitude, and is connected to the system bus via the input / output interface 24. The GPS sensor 31 includes a GPS receiver that receives signals from a plurality of GPS satellites and measures the absolute position of the user.
[0030]
The vehicle speed sensor 32 and the gyro sensor 33 are for measuring the relative position of the vehicle, and are connected to the system bus via the input / output interface 24. These sensors are used for autonomous navigation, and the relative position measured by these sensors is the absolute position measured by the GPS receiver, such as in a tunnel where the GPS receiver cannot receive radio waves from the satellite. This is used to correct positioning errors.
[0031]
The communication device 35 is a wireless communication device for transmitting and receiving data to and from the information center 70 via a wireless communication line, and is connected to the system bus via the input / output interface 24. For example, a wireless communication system such as a mobile phone or PHS is used.
[0032]
The information center 70 mainly includes a control device 72, a communication device 74, and the like. The control device 72 includes a CPU, a memory, and the like, like the CPU 21 and the memory 22 of the navigation device 20, and stores a traffic information providing program 72 a that can transmit the road traffic information 72 b to the navigation device 20. Accordingly, the road traffic information 72b can be provided to the navigation device 20 in response to a request from the navigation device 20.
[0033]
The communication device 74 of the information center 70 is a wireless communication device for transmitting and receiving data to and from the navigation device 20 through a wireless line. Like the communication device 35 of the navigation device 20, for example, a car phone, a mobile phone, and a PHS. The wireless communication system such as the above is used, or a device for connecting to a telephone line switching station that communicates with the communication device 35 of the navigation device 20 is used.
[0034]
Here, an outline of the input program 22b, the route search program 22c, the traffic information acquisition program 22d, the required time calculation program 22e, the error calculation program 22f, and the drawing program 22g stored in the memory 22 will be described.
[0035]
The input program 22b allows the user to input various information necessary for using the navigation function via the input device 25, in addition to information related to the destination that the user of the navigation device 20 desires for route guidance. It has a function of passing to other programs and processes.
[0036]
The route search program 22c has a function of searching for a destination input by the input device 25 based on the map information stored in the map information database 23, and the desired destination from the current location of the vehicle detected by the GPS sensor 31 or the like. And a function for searching for a recommended route based on road information recorded in the map information database 23.
[0037]
The traffic information acquisition program 22d has a function of acquiring road traffic information 72b from the information center 70 via the communication device 35, thereby acquiring desired road traffic information 72b from the outside of the vehicle.
[0038]
The required time calculation program 22e has a function of estimating and calculating the estimated required time required when traveling on the recommended route searched by the route search program 22c by statistical processing to be described later, and is described in the claims. This corresponds to “estimated required time calculation means”.
[0039]
The error calculation program 22f estimates an estimation error existing in the estimated required time calculated by the required time calculation program 22e with respect to the actual actual required time required when traveling on the recommended route searched by the route search program 22c. And is equivalent to “estimation error calculation means” described in the claims.
[0040]
The drawing program 22g has a function of drawing various screen information as a diagram on the display 26, draws a map based on road information in the map information database 23, and maps a recommended route searched by the route search program 22c. Has the ability to draw on top. Further, it has a function of displaying the estimated required time calculated by the required time calculation program 22e and the estimated error calculated by the error calculation program 22f together with the recommended route. The drawing program 22g corresponds to “display control means” recited in the claims. In addition to the drawing program, a voice output program (not shown) for notifying the user of the estimated arrival time and the like via a speaker corresponds to “notification means” in the claims.
[0041]
Next, the flow of each program processed by the navigation device 20 will be described with reference to FIGS. Each process described below is executed by the above-described input program 22b, route search program 22c, traffic information acquisition program 22d, required time calculation program 22e, error calculation program 22f, and drawing program 22g. This is started from the main routine.
[0042]
As shown in FIG. 2, the navigation apparatus 20 first performs a process of inputting a destination in step S101. Specifically, the input program 22b displays a predetermined input screen on the display 26 via the drawing program 22g, thereby selecting a destination for which route guidance is desired via the input device 25 such as a touch panel, or The user is prompted to perform an input operation such as inputting a destination name into a text box. Thereby, since the input destination information regarding the destination is stored in the work area or the like of the memory 22, the destination information can be delivered to the route search program 22c or the like.
[0043]
Next, a process for acquiring current location information is performed in step S103. Specifically, the current location information on the current position of the vehicle obtained by the GPS sensor 31 or the gyro sensor 33 is stored in the work area or the like of the memory 22 as data based on longitude, latitude, etc., so that the route search program 22c or the like can be used. Delivery is possible. Here, the current position corresponds to the “departure place” described in the claims.
[0044]
In step S105, a route searching process is performed. This process is executed by the route search program 22c, and refers to the road information 23a in the map information database 23 based on the destination information input in step S101 and the current location information acquired in step S103. Thus, a recommended route from the current location to the destination is searched. Note that this route search algorithm is performed by the method disclosed in, for example, Japanese Patent Laid-Open Nos. 1-173297 and 1-173298, and the condition that the route having the shortest distance is the optimum route is used. The recommended route is set by.
[0045]
In the subsequent step S107, processing for acquiring traffic information is performed. This process is executed by the traffic information acquisition program 22d, and acquires the road traffic information 72b related to the recommended route from the information center 70 via the communication device 35. For example, the past required time data for each road related to the recommended route is acquired from the information center 70 as road traffic information 72b. When such road traffic information 72b is stored in advance in the map information database 23 or the like, the traffic information acquisition program 22d acquires the road traffic information 72b related to the recommended route from the map information database 23. Further, after the traffic information is acquired in step S107, the route search in step S105 may be performed in consideration of the acquired traffic information. In this case, it is possible to search for a route that can avoid a traffic jam that is currently occurring based on the acquired traffic information.
[0046]
In step S109, processing for calculating the estimated required time is performed. This process is executed by the required time calculation program 22e. By statistically processing the past required time data acquired in step S107, the average required time of each road and the fluctuation range of the required time are obtained as a probability distribution. Get as. Since the probability density distribution obtained in this way is calculated for each road of the route, by integrating them, the probability density distribution of the required time along the recommended route from the current location (departure point) to the destination is obtained. The peak value of the probability density distribution is generated as the estimated required time. That is, the peak value of the probability density distribution of the required time required when traveling on the recommended route is estimated and calculated as the estimated required time.
[0047]
In step S111, processing for calculating an estimation error for the estimated required time is performed. This process is executed by the error calculation program 22f, and the lower limit value and the upper limit value in a range where the probability is 90%, for example, centered on the peak value of the probability density distribution of the required time calculated in step S109, The estimation error is estimated and calculated as the minimum and maximum values.
[0048]
For example, as shown in FIG. 3A, the peak value Pavr of the probability density distribution graph is the estimated required time, and points Pmin and Pmax are equidistant from the peak value Pavr to the left and right of the graph. The values of Pmin and Pmax at which the portion surrounded by the graph curve and the horizontal axis (the portion indicated by hatching in FIG. 3A) become 90% are calculated as the minimum value and the maximum value of the estimation error. That is, in step S109, based on such statistical processing, the estimated required time and the maximum value and the minimum value of the estimated required time that are a predetermined probability (for example, 90%) or more are calculated.
[0049]
In the present embodiment, the processing (steps S109 and S111) by the required time calculation program 22e and the error calculation program 22f is configured to be performed on the navigation device 20 side, but is not limited thereto, and for example, on the information center 70 side. Alternatively, the processing similar to the processing by the required time calculation program 22e and the error calculation program 22f may be performed, and the processing result may be acquired by the navigation device 20 by the traffic information acquisition program 22d. Accordingly, when the processing capability of the control device 72 on the information center 70 side is high and the throughput is higher than that of the navigation device 20, it is possible to expect a reduction in information processing time.
[0050]
In step S113, a process for displaying the recommended route, the estimated required time, and the estimated error on the display 26 is performed. That is, the drawing program 22g performs a process of drawing the recommended route searched in step S105 and its surrounding map on the display 26, and further displays the estimated required time and estimated error calculated in S109 and S111 on the display 26. Processing is performed.
[0051]
For example, as shown in FIG. 4A, a recommended route γ from the current position (starting point) α of the vehicle to the destination β is displayed on the display 26, and the time required for traveling along the recommended route is estimated. As a result, “required time 1:30” is displayed at the lower right of the screen. Then, “+30” is displayed as an estimated error in the superscript position on the right side of the estimated required time, and “−10” is displayed in the subscript position.
[0052]
  “+30” displayed in the superscript position indicates that the required time range having a probability of 90% with respect to the estimated required time of 1 hour 30 minutes increases as described with reference to FIG. 30 minutes, and “−10” displayed in the subscript position indicates that the required time range with a probability of 90% with respect to the estimated required time of 1 hour 30 minutes is 10 minutes in a decreasing direction. , Respectively. That is, figure4 (A)In the example shown, it shows that the required time can arrive between 1 hour 20 minutes (= 1 hour 30 minutes-10 minutes) and 2 hours (= 1 hour 30 minutes + 30 minutes) with a probability of 90%. . As a result, the user can grasp that the estimated required time is 1 hour 30 minutes, but it is more likely to take more time.
[0053]
In step S109 described above, as the process for calculating the estimated required time, the historical required time data acquired in step S107 is statistically processed, so that the average required time of each road and the fluctuation range of the required time are represented by a probability distribution. For example, in step S107, the travel speed of the past vehicle (hereinafter referred to as “vehicle speed”) is acquired as traffic information, and in step S109, the estimated required time is estimated based on the vehicle speed. Also good. That is, as in Fig. 3 (A), by obtaining a probability density distribution with the vehicle speed on the horizontal axis, the horizontal axis is converted by dividing the total distance of the recommended route by the vehicle speed. A probability density distribution having the required time on the horizontal axis as shown can be obtained.
[0054]
Further, when the road traffic information 72b acquired from the information center 70 in step S107 is the required time data for each passing vehicle on each road, in step S109, the horizontal axis represents the required time in predetermined time increments. The calculation process may be performed so as to generate a frequency distribution table in which the number of vehicles that have passed within the range of the required time is expressed as a frequency on the vertical axis. In this case, since a frequency distribution table as shown in FIG. 3B is generated, the required time Pavr of the maximum frequency is set as the estimated required time, and the frequency adjacent to the left and right of the graph is added from this required time Pavr. Processing is performed so that the lower limit value Pmin and the upper limit value Pmax in the range where the result is 90% of the total frequency are calculated as the minimum value and the maximum value of the estimation error. In FIG. 3B, when the frequency from the lower limit value Pmin to the upper limit value Pmax is added, it becomes 90% of the total frequency.
[0055]
Further, in step S111, the probability (or the ratio of the frequency to be added to the total frequency) is 45% independently from the position of the estimated required time Pavr in the graphs shown in FIGS. 3 (A) and 3 (B). The lower limit value Pmin and the upper limit value Pmax may be calculated so that As a result, when the shape of the graph is not symmetrical with respect to Pavr, the error minimum value and the difference between the maximum value and the estimated value are determined depending on the graph shape, so that the error range reflecting the distribution shape Can be obtained.
[0056]
Furthermore, the display process in step S113 may be configured so that the estimated arrival time obtained by adding the estimated required time to the current time obtained by the clock 21a built in the CPU 21 is displayed on the display 26.
[0057]
That is, as shown in FIG. 4B, the graphic program of the analog clock δ is displayed by the drawing program 22g, thereby adding processing for displaying the estimated arrival time on the analog clock δ. In this case, the estimation error is expressed as a sector-shaped error range display k1 (vertical and horizontal cross-hatching range) and k2 (vertical hatching range). The error range display k1 indicates the fluctuation range of the arrival time in the 90% error range, and the error range display k2 indicates the 80% error range. By displaying in an analog clock manner in this way, it is possible to make it easier to intuitively grasp the fluctuation range of the arrival time than the digital clock display. Note that the required time display shown in FIG. 4 (A) and the analog clock display shown in FIG. 4 (B) may both be displayed on the same screen. Thereby, it is possible to deal with diversified user preferences for the clock display.
[0058]
Further, a plurality of recommended routes are searched in step S105, an estimated required time is calculated for each of the searched recommended routes in step S109, and an estimated required time is estimated for each of the searched recommended routes in step S111. Each process may be configured to calculate an error and display the plurality of recommended routes, the estimated required time for each of the plurality of recommended routes, and the estimated error for each of the plurality of recommended routes on the display 26 in step S113.
[0059]
Thus, as shown in the display example of FIG. 5, in route 1 (reference numeral γ1 in FIG. 5), the estimated required time is 1 hour and 20 minutes, the estimation errors are +30 minutes and −40 minutes, and route 2 (in FIG. 5). If the estimated time required is 1 hour and the estimated error is ± 5 minutes in the case of symbol γ2), it can be seen that route 2 is shorter as estimated time, and route 1 may take a considerable amount of time. However, in some cases, it can be understood that there is a possibility of arrival earlier than route 2. As a result, the user can be given a degree of freedom in selecting a recommended route according to the current status and preferences of the user.
[0060]
As described above, according to the navigation device 20 and the program thereof according to the present embodiment, the estimated required time required when traveling on the searched recommended route γ is estimated and calculated by the required time calculation program 22e (step S109). Then, an estimation error of the estimated required time with respect to the actual actual required time required when the recommended route γ is advanced is estimated by the error calculation program 22f (S111), and is calculated by the drawing program 22g (S113). The estimated required time and the estimated error are displayed on the display 26 (FIG. 4A). As a result, the recommended route γ from the current position α to the destination β, the estimated required time to the destination, and the estimated error of the required time can be displayed on the display 26, so the user can determine the reliability of the estimated required time from the estimated error. Can be obtained. By displaying the estimated error with respect to the estimated required time, the user of the navigation device 20 can make a schedule after arrival in anticipation of the time error with respect to the estimated required time.
[0061]
As a method for calculating Pavr and estimation error, other methods of statistical processing exemplified in the above embodiment may be used. For example, there are arithmetic methods such as arithmetic average, weighted average, median (median), and mode (most frequent value) as methods for calculating Pavr. For example, a method may be used in which the degree is obtained, or the probability is obtained from the standard deviation assuming that the required time distribution and the vehicle speed distribution are normally distributed.
[0062]
Further, according to the navigation device 20 according to the present embodiment, the drawing program 22g (S113) estimates the estimated arrival time by adding the estimated required time to the current time acquired by the clock 21a of the CPU 21 instead of or in addition to the estimated required time. The time is displayed on the display 26 as an analog clock δ (FIG. 4B). Thus, by displaying the estimated arrival time and its estimated error on the display 26 instead of or in addition to the estimated required time, the user of the navigation device 20 can obtain the reliability of the estimated arrival time from the estimated error. Therefore, the arrival time and its estimated fluctuation range can be grasped more visually.
[0063]
  Furthermore, according to the navigation device 20 according to the present embodiment, the required time calculation program 22e (S109)"Traffic information obtained from outside the vehicle"Or"Vehicle traveling speed"The estimated time required is calculated based on the error calculation program 22f (S111)"Traffic information obtained from outside the vehicle"Or"Vehicle traveling speed"An estimation error is calculated based on This"Traffic information obtained from outside the vehicle"Or"Vehicle traveling speed"Since the estimated required time or the estimation error is calculated based on the above, it is possible to display the estimated required time and the estimation error on the display 26 in accordance with the road traffic situation. Therefore, the user can obtain higher reliability for the estimated required time.
[0064]
Furthermore, according to the navigation device 20 according to the present embodiment, the estimation error is the maximum value Pmax and the minimum value Pmin of the estimated required time that is 90% or more with respect to the estimated required time. The required time and estimation error can be calculated (FIG. 3 (A), FIG. 3 (B)). Thereby, the user of the navigation apparatus 20 can obtain higher reliability with respect to the estimated required time. Note that the predetermined probability for the estimated required time may be 95%, 85%, 80%, 70%, etc., and by varying this probability, the estimation error for the estimated required time is more in line with the road traffic situation. It becomes possible to set it to a thing.
[0065]
Furthermore, according to the navigation device 20 according to the present embodiment, the required time calculation program 22e (S109) calculates the estimated required time for each of the plurality of searched recommended routes γ1 and γ2, and the error calculation program 22f (S111) Then, an estimation error of the estimated required time is calculated for each of the searched plurality of recommended routes γ1 and γ2, and the drawing program 22g (S113) calculates the plurality of recommended routes γ1, γ2, the estimated required time for each of the plurality of recommended routes, The estimated error for each recommended route is displayed on the display 26 (FIG. 5). As a result, the estimated required time of each recommended route and the error range thereof are displayed on the display 26 for the plurality of recommended routes γ1 and γ2 obtained by the route search. When selecting one of the recommended routes γ1 and γ2, it is possible to select in consideration of the certainty of the required time.
[0066]
It is also preferable to repeatedly execute steps S107 to S113 in FIG. 2 at predetermined time intervals (for example, every 30 minutes) while a recommended route is searched and route guidance is being executed. Then, after calculating the estimated arrival time by adding the current time to the estimated required time obtained in step S109, the display is obtained when a result different from the previous estimated arrival time by a predetermined time (for example, different by 30 minutes or more) is obtained. In addition to being displayed on the screen 26, the speaker notifies the change of the estimated arrival time by voice. That is, by acquiring traffic information that changes from moment to moment even while the route is in progress, the user can be notified immediately when the estimated arrival time changes. Even if the estimated error with respect to the estimated arrival time changes, by notifying the user in the same way, if the probability of the estimated arrival time changes as the traffic situation on the route changes, that By knowing, you can get suggestions to reconsider the next action plan.
[0067]
Furthermore, when the estimated arrival time or the estimation error is different from the previous calculation result, it is preferable to notify the cause of the difference in the calculation result together with that fact. Since the user does not want to know the traffic situation directly, but wants to know what time the destination can be reached according to the traffic situation at that time, if the expected arrival time changes, and This is because notifying the reason presents effective information to the user.
[0068]
In the above-described embodiment, the navigation device 20 has been described as an example. However, the present invention is not limited to this, and any information processing device having a navigation function can be used, for example, a personal computer, a handheld computer, and portable information. The present invention can be applied even to a terminal, a mobile phone provided with a portable information terminal function, an electronic notebook, and the like, and the same operations and effects as described above can be obtained.
[0069]
Further, the computer program of the present invention is applied to a computer that constitutes an information center that provides traffic information and the like to the navigation device, and the image data to be displayed on the display of the navigation device is transmitted to the navigation device. The operation and effect of can be obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a navigation device according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a flow of navigation processing according to the present embodiment.
3 is an explanatory diagram showing an example of a probability density distribution graph generated by statistical processing in step S109 shown in FIG. 2. FIG. 3 (A) shows the past required time on the horizontal axis and the probability density distribution on the vertical axis. In FIG. 3 (B), the horizontal axis represents the time required for past passing vehicles, and the vertical axis represents the frequency distribution of the number of vehicles.
FIG. 4 is an explanatory view showing an example of a display display in step S113 shown in FIG. 2. FIG. 4 (A) shows the estimated required time and estimated error in addition to the recommended route, and FIG. In addition to the recommended route, the estimated required time and estimated error are displayed in an analog clock.
FIG. 5 is an explanatory diagram showing an example in which a plurality of recommended routes, an estimated required time for each of the plurality of recommended routes, and an estimation error for each of the plurality of recommended routes are displayed on a display.
[Explanation of symbols]
20 Navigation device (computer)
21 CPU (estimated required time calculating means, estimated error calculating means, display control means)
21a Clock (timer)
22 memory
22b Input program
22c route search program
22d Traffic information acquisition program
22e Required time calculation program (estimated required time calculation means)
22f Error calculation program (estimated error calculation means)
22g drawing program (display control means)
23 Map information database
25 Input device
26 Display (Display device)
31 GPS sensor
32 Vehicle speed sensor
33 Gyro sensor
70 Information Center
72a Traffic information provision program
72b Road traffic information (traffic information)
α Current location (Departure location)
β destination
γ recommended route
γ1 route 1 (multiple recommended routes)
γ2 route 2 (multiple recommended routes)
S109 (estimated required time calculation means)
S111 (estimation error calculation means)
S113 (display control means)

Claims (8)

  1. In a navigation device that provides guidance by searching for a recommended route from the starting point to the destination,
    Estimated required time calculation means for estimating and calculating an estimated required time when the searched recommended route is traveled,
    An estimation error calculating means for estimating and calculating an estimation error of the estimated required time;
    Display control for displaying on the display device the recommended route, the estimated required time, the estimation error, a direction in which the estimated required time range increases due to the estimated error, and a direction in which the estimated required time range decreases due to the estimated error Means,
    A navigation device comprising:
  2. The navigation device according to claim 1, further comprising a timing device that acquires a current time,
    The display control means displays the estimated arrival time obtained by adding the estimated required time to the current time acquired by the time measuring device in place of or in addition to the estimated required time in a graphic display of an analog clock using an hour hand and a minute hand. Display on the device,
    A direction in which the range of the estimated required time increases due to a fan-shaped range that extends in a clockwise direction from the minute hand in a fan shape that overlaps and spreads on the display of the analog timepiece around the rotation axis of the minute hand that represents the estimated arrival time And the magnitude of the estimation error corresponding to the increment, and the direction corresponding to the decrease and the direction in which the estimated required time range decreases due to the fan-shaped range that opens counterclockwise from the minute hand. A navigation apparatus characterized by displaying a magnitude of an error.
  3. A navigation device Motomeko 1, wherein,
    The display control means may be displayed on the display device a graphical representation of a digital clock with hour numbers and the minute numbers in front Symbol estimated time,
    To display the size of the estimation error corresponding to the previous SL direction increment thereof range of the estimated time by a "+" sign and the fraction numbers are displayed on the right superscript position of the digital clock is increased, before The direction of the estimated required time is reduced by the "-" symbol and the fractional number displayed at the right subscript position of the digital clock, and the magnitude of the estimated error corresponding to the reduced amount is displayed. A navigation device.
  4. The navigation device according to any one of claims 1 to 3, wherein a plurality of recommended routes from a starting point to a destination are searched.
    The estimated required time calculating means calculates the estimated required time for each of a plurality of searched recommended routes,
    The estimated error calculating means calculates an estimated error of the estimated required time for each of a plurality of searched recommended routes,
    The display control means is configured to increase the range of the estimated required time due to the plurality of recommended routes, the estimated required time for each of the plurality of recommended routes, the estimated error for each of the plurality of recommended routes, and the estimated error. And a display device that displays a direction in which the range of the estimated required time decreases due to the estimation error.
  5. The navigation device according to any one of claims 1 to 4, wherein the navigation device is mounted on a vehicle.
    The estimated required time calculating means estimates and calculates the estimated required time based on “traffic information acquired from outside the vehicle” or “traveling speed of the vehicle”;
    The navigation apparatus according to claim 1, wherein the estimation error calculation means calculates the estimation error based on "traffic information acquired from outside the vehicle" or "travel speed of the vehicle".
  6. The estimated required time calculating means and / or the estimated error calculating means estimates the estimated arrival time and / or the estimated error every predetermined time,
    A notification means for notifying the user that a result different from the previous time is calculated when a result different from the previous estimated arrival time and / or estimation error is calculated;
    The navigation apparatus according to any one of claims 1 to 5, further comprising:
  7. The estimation error calculated by the estimation error calculation means is
    The estimated required time calculated by the estimated required time calculating means is a maximum value and a minimum value of the estimated required time that are equal to or greater than a predetermined probability. The navigation device described.
  8. A computer that searches the recommended route from the departure point to the destination and outputs guidance information.
    Estimated required time calculation means for estimating and calculating an estimated required time required when the searched recommended route is advanced,
    An estimation error calculation means for estimating and calculating an estimation error of the estimated required time, and
    Function as output means for outputting the recommended route, the estimated required time, the estimation error, a direction in which the estimated required time range increases due to the estimated error, and a direction in which the estimated required time range decreases due to the estimated error Program to
    A computer program comprising:
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