JP2013113584A - System and method for indicating estimated time of arrival and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more appropriately update indication of estimated time of arrival.SOLUTION: Residual estimated time required TRest from a current place up to a destination is calculated (S170), actual time required TAact from a departure place up to the current place is acquired (S190) and actual estimated time required TAest corresponding to a section from the departure place up to the current place out of estimated time required TTest is calculated (S200). When a determination rate Rt which is a rate of difference time ΔTA between the actual time required TAact and actual estimated time required TAest to the residual estimated time required TRest is a determination threshold Rref or more (S240), indication of estimated time of arrival ETA is updated based on the residual estimated time required TRest and current time (S260), and when the determination rate Rt is less than the determination threshold Rref, the indication of the estimated time of arrival ETA is not updated. When accuracy of prediction is low even when the estimated time of arrival ETA is estimated, updating of indication of the estimated time of arrival can be suppressed.

Description

  The present invention relates to an estimated arrival time display system, an estimated arrival time display method, and a program, and more specifically, an estimated arrival time display system and an estimated arrival time for calculating an estimated arrival time of a destination on a travel route and displaying the calculated arrival time. The present invention relates to a display method and a program.

  Conventionally, as a technique related to this kind of predicted arrival time display system, a navigation device calculates a required time from a departure place to a destination and calculates an estimated arrival time every predetermined time (for example, every minute). Temporarily storing the predicted arrival time, and comparing the stored predicted arrival time with the predicted arrival time calculated after a predetermined time to determine whether or not there is a shift of a predetermined time or more (for example, 10 minutes or more). In the case where it is determined that the time is deviated for a predetermined time or more, a notification means has been proposed (see, for example, Patent Document 1). In this technique, the driver is surely notified of a large variation in predicted arrival time while avoiding the troublesomeness of guiding the variation in predicted arrival time at every update interval such as one minute.

JP 2008-82895 A

  However, in the navigation device technology described above, the display of the predicted arrival time may not be updated properly. For example, when a delay of a predetermined time or more (for example, 10 minutes or more) occurs immediately after the vehicle starts to travel from the departure place, the travel distance to the destination is long, and depending on the future travel, the initial estimated arrival time Even if there is a possibility that it may be in time, the display of the predicted arrival time may be changed to a later one, or the display of the predicted arrival time that has been changed to the later one will be accelerated again by subsequent driving (The display of the predicted arrival time is frequently updated).

  The main purpose of the predicted arrival time display system, predicted arrival time display method, and program of the present invention is to more appropriately update the display of the predicted arrival time.

  The predicted arrival time display system, predicted arrival time display method, and program of the present invention employ the following means in order to achieve the above-mentioned main object.

The predicted arrival time display system of the present invention is
An estimated arrival time display system for calculating an estimated arrival time of a destination on the travel route using road information of the travel route when a travel route of the vehicle is set, and displaying the arrival time on a display unit,
An estimated required time calculating means for calculating an estimated required time from the starting point on the travel route to the destination;
An estimated arrival time display processing unit that calculates an estimated arrival time of the destination based on the estimated required time and the time at which the estimated required time is calculated, and displays the estimated arrival time on the display unit;
An actual required time acquisition means for acquiring an actual required time from the departure place to the present location;
Of the estimated required time, an actual estimated required time calculating means for calculating an actual estimated required time corresponding to a section from the departure place to the current location;
A remaining estimated required time calculating means for calculating a remaining estimated required time from the current location to the destination;
When the determination ratio, which is the ratio of the difference between the actual required time and the actual estimated required time to the remaining estimated required time, is equal to or greater than a threshold, the display is performed based on the remaining estimated required time and the current time. An estimated arrival time updating means for updating the estimated arrival time displayed in the section;
It is a summary to provide.

  In this predicted arrival time display system of the present invention, the estimated required time from the departure point to the destination on the travel route is calculated, and the arrival prediction of the destination is based on the estimated required time and the estimated required time. The time is calculated and displayed on the display unit. Then, the actual required time from the starting point to the current location is obtained, the estimated estimated time corresponding to the section from the starting point to the current location is calculated, and the estimated remaining time from the current location to the destination is calculated. When the determination ratio, which is the ratio of the difference between the actual required time and the actual estimated time to the remaining estimated required time, is equal to or greater than the threshold, the display unit displays the estimated remaining required time and the current time. Update the predicted arrival time displayed. That is, when the determination ratio is less than the threshold value, the predicted arrival time displayed on the display unit is not updated. Therefore, the smaller the difference between the actual required time and the actual estimated required time and the longer the remaining estimated required time, the more difficult the display of the predicted arrival time is updated. In other words, even if the difference between the actual travel time and the actual estimated travel time is relatively large, that is, when the degree of delay or advance caused by the travel from the departure location to the current location is large, the remaining estimated travel time is relatively When it is long, that is, when the actual arrival time tends to be early or late due to future travel from the current location to the destination, the display of the predicted arrival time is difficult to update. Thereby, even if the predicted arrival time is predicted, the display of the predicted arrival time can be suppressed from being updated when the accuracy of the prediction is low. As a result, the display of the predicted arrival time is suppressed from being frequently updated, and the display of the predicted arrival time can be updated more appropriately. Here, the remaining estimated required time calculating means may calculate, as the remaining estimated required time, a time corresponding to a section from the current location to the destination in the estimated required time. The remaining estimation required time may be newly calculated without using the required time. In the former case, the remaining estimated required time calculating means may calculate a time obtained by subtracting the actual estimated time from the estimated required time as the remaining estimated required time.

  In such an estimated arrival time display system of the present invention, the threshold value may be a value that tends to increase as the remaining travel distance from the current location to the destination increases. In this way, the longer the remaining travel distance, the more difficult it is to display the predicted arrival time, so even if the predicted arrival time is predicted, the predicted arrival time display is suppressed when the prediction accuracy is low. can do.

  Further, in the predicted arrival time display system of the present invention, the system includes traffic information acquisition means for acquiring traffic information including a traffic congestion degree that is the degree of traffic congestion on the road, and the estimated required time calculation means includes a departure time at the departure location. The estimated time required is calculated based on the traffic jam information acquired by the traffic jam information acquisition unit at the time when the new traffic jam information is acquired by the traffic jam information acquisition unit. Regardless of the determination ratio, the estimated arrival time displayed on the display unit may be updated. By doing so, the display of the predicted arrival time can be updated when new traffic information is acquired. As a result, it is possible to reset the delay or advance with respect to the predicted arrival time being displayed that has occurred in a range less than the threshold until new traffic jam information is acquired. Here, when new traffic information is acquired by the traffic information acquisition means, when the degree of traffic corresponding to the section from the current location to the destination at the current time has changed from the time of the departure time, It can also be. Further, the remaining estimated required time calculating means may be means for calculating the remaining estimated required time based on traffic jam information acquired by the traffic jam information acquiring means at the current time.

  In the arrival prediction time display system of the present invention in which the arrival prediction time is updated regardless of the determination ratio when the new traffic information is acquired, the threshold value is the remaining travel distance from the current location to the destination. Among them, it may be a value that tends to increase as the distance of the road that is the target of the traffic jam information increases. By doing so, the display of the predicted arrival time is updated as the possibility that new traffic information is acquired in the future, that is, the possibility that the delay or advance with respect to the predicted arrival time being displayed can be reset is higher. Therefore, the estimated arrival time can be updated more appropriately. In this case, the threshold value is larger as the ratio of the distance of the road subject to the traffic jam information to the total travel distance from the departure place to the destination is larger than the remaining travel distance from the current position to the destination. It can also be a value that tends to increase. Further, the traffic information acquisition means is means for acquiring the traffic information of the road that is the target of the traffic information, among the road that is the target of the traffic information and the road that is not the target of the traffic information. It can also be.

  In the estimated arrival time display system of the present invention, the system includes traffic information acquisition means for acquiring traffic information including a traffic congestion degree that is the degree of traffic congestion on the road, and the estimated required time calculation means is configured to generate the traffic information at the departure time at the departure location. It is means for calculating the estimated required time based on the traffic jam information acquired by the traffic jam information acquisition means, and the predicted arrival time update means when the new traffic jam information is acquired by the traffic jam information acquisition means, It is also possible to use a value corresponding to a change from the departure time of the congestion level corresponding to a section from the current location to the destination as the threshold value. In this way, the change in the degree of congestion can be reflected on the threshold value. Here, when new traffic information is acquired by the traffic information acquisition means, when the degree of traffic corresponding to the section from the current location to the destination at the current time has changed from the time of the departure time, It can also be. Further, the remaining estimated required time calculating means may be means for calculating the remaining estimated required time based on traffic jam information acquired by the traffic jam information acquiring means at the current time.

  In the arrival prediction time display system of the present invention that uses a threshold value corresponding to a change in the degree of congestion when the new congestion information is acquired, the estimated arrival time update unit uses the congestion information acquisition unit to generate new congestion When the information is acquired, it is means for using, as the threshold value, a value that tends to increase as the amount of increase from the departure time of the degree of congestion corresponding to the section from the current location to the destination increases. You can also. In this way, it is possible to suppress the display of the predicted arrival time from being updated when it is considered that the prediction accuracy is relatively low even if the predicted arrival time is predicted due to an increase in the degree of congestion. .

  In the arrival prediction time display system of the present invention in which a threshold value corresponding to a change in the degree of congestion is used when new congestion information is acquired, the estimated arrival time update unit is updated by the congestion information acquisition unit. When the traffic information is acquired, when new traffic information is acquired by the traffic information acquisition means, the increase in the traffic level corresponding to the section from the current location to the destination increases from the departure time. It is also possible to use a value that tends to decrease as the threshold value. In this way, it is possible to easily update the display of the predicted arrival time when it is considered that the required time from the current location to the destination will be relatively long due to an increase in the degree of congestion.

  In the predicted arrival time display system of the present invention, the threshold value may be a value that tends to increase as the distance of the highway increases, among the remaining travel distance from the current location to the destination. In this way, the longer the distance of the remaining highway in the travel route, that is, the easier it is to recover the delay due to future travel from the current location to the destination, the more difficult it is to update the display of the predicted arrival time.

  Further, in the predicted arrival time display system of the present invention, the estimated required time calculation means is configured to display the estimated arrival time displayed on the display unit after the update when the predicted arrival time displayed on the display unit is first updated. It is means for calculating the estimated required time from the update point where the time was updated last time to the destination, and the actual required time acquisition means is the actual required time from the update point to the current location after the update. The actual estimated estimated time calculating means calculates the actual estimated estimated time corresponding to a section from the update point to the current location in the estimated required time after the update. It can also be a means to do. By so doing, it is possible to more appropriately update the display of the predicted arrival time even after the update when the predicted arrival time is first updated.

The predicted arrival time display method of the present invention is
A predicted arrival time display method for calculating a predicted arrival time of a destination on the travel route using road information of the travel route when the travel route of the vehicle is set, and displaying it on the display unit,
(A) calculating an estimated required time from the starting point on the travel route to the destination;
(B) calculating an estimated arrival time of the destination based on the estimated required time and the calculated time, and displaying the estimated arrival time on the display unit;
(C) obtaining an actual required time from the departure location to the current location;
(D) calculating an actual estimated required time corresponding to a section from the departure place to the current location in the estimated required time;
(E) calculating an estimated remaining time from the current location to the destination;
(F) When a ratio for determination, which is a ratio of the difference between the actual required time and the actual estimated time required, to the remaining estimated required time is equal to or greater than a threshold, based on the remaining estimated required time and the current time Updating the predicted arrival time displayed on the display unit,
It is characterized by including.

  In this predicted arrival time display method of the present invention, the estimated required time from the departure point to the destination on the travel route is calculated, and the arrival prediction of the destination is calculated based on the estimated required time and the estimated required time. The time is calculated and displayed on the display unit. Then, the actual required time from the starting point to the current location is obtained, the estimated estimated time corresponding to the section from the starting point to the current location is calculated, and the estimated remaining time from the current location to the destination is calculated. When the determination ratio, which is the ratio of the difference between the actual required time and the actual estimated time to the remaining estimated required time, is equal to or greater than the threshold, the display unit displays the estimated remaining required time and the current time. Update the predicted arrival time displayed. That is, when the determination ratio is less than the threshold value, the predicted arrival time displayed on the display unit is not updated. Therefore, the smaller the difference between the actual required time and the actual estimated required time and the longer the remaining estimated required time, the more difficult the display of the predicted arrival time is updated. In other words, even if the difference between the actual travel time and the actual estimated travel time is relatively large, that is, when the degree of delay or advance caused by the travel from the departure location to the current location is large, the remaining estimated travel time is relatively When it is long, that is, when the actual arrival time tends to be early or late due to future travel from the current location to the destination, the display of the predicted arrival time is difficult to update. Thereby, even if the predicted arrival time is predicted, the display of the predicted arrival time can be suppressed from being updated when the accuracy of the prediction is low. As a result, the display of the predicted arrival time is suppressed from being frequently updated, and the display of the predicted arrival time can be updated more appropriately. Here, in the step (e), a time corresponding to a section from the current location to the destination in the estimated required time may be calculated as the remaining estimated required time, and the estimated required time may be calculated as The remaining estimated time may be newly calculated without using it. In the former case, the step (e) may calculate a time obtained by subtracting the actual estimated time from the estimated required time as the remaining estimated required time.

  The program of the present invention is for causing one or more computers to implement each step of the above-described predicted arrival time display method. This program may be recorded on a computer-readable recording medium (for example, hard disk, ROM, FD, CD, DVD, etc.), or from a computer via a transmission medium (communication network such as the Internet or LAN). It may be distributed to another computer, or may be exchanged in any other form. If this program is executed by one computer or shared by a plurality of computers, each step of the predicted arrival time display method described above is realized, so the same effects as the predicted arrival time display method are realized. Is obtained.

It is a block diagram which shows the outline of a structure of the navigation apparatus 20 as an estimated arrival time display system which is one Example of this invention. 7 is a flowchart illustrating an example of an estimated arrival time display processing routine executed by an estimated arrival time processing unit 68 of the electronic control unit 30. It is explanatory drawing which shows an example of a mode that the estimation required time TTest from the departure place to the destination is calculated. It is explanatory drawing which shows an example of the screen of the display 22 which displayed the arrival arrival time ETA. It is a flowchart which shows an example of the threshold value setting process for determination. It is explanatory drawing which shows an example of the map for coefficient setting based on the remaining travel distance LR. It is explanatory drawing which shows an example of the map for coefficient setting based on the remaining driving highway distance LRH. It is explanatory drawing which shows an example of the coefficient setting map based on the ratio with respect to the total travel distance LA of the remaining travel congestion information object distance LRT. It is explanatory drawing which shows the example of a mode that the residual ratio required time TRest and the actual part estimated required time TAest are calculated, and the ratio Rt for determination and the threshold value Rref for determination are compared. It is explanatory drawing which shows an example of the map for coefficient setting based on increase amount (DELTA) TJ of the congestion degree of a modification. It is explanatory drawing which shows an example of the map for coefficient setting based on increase amount (DELTA) TJ of the congestion degree of a modification.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of a configuration of a navigation device 20 as an estimated arrival time display system according to an embodiment of the present invention. The navigation device 20 according to the embodiment is mounted on a vehicle (not shown) together with other in-vehicle devices 12 and has a rectangular screen for displaying characters and images, for example, a display 22 configured as a liquid crystal display or an organic electroluminescence display. A touch panel 24 attached to the screen of the display 22 such as a resistive film type or a capacitance type, a plurality of buttons 25 that can be pressed by an operator (user), and an electronic control unit 30 that controls the entire apparatus. And a hard disk drive (hereinafter referred to as HDD) 40 as a large-capacity memory for storing various application software, map data, etc., and operates by receiving power supply from a vehicle battery (not shown).

  The electronic control unit 30 is configured as a microprocessor centered on the CPU 32. In addition to the CPU 32, the ROM 34 that stores various processing programs, the RAM 36 that temporarily stores data, and the nonvolatile that holds the stored data. Flash memory 38, an input / output port, a communication port, and a timer (not shown). A signal from the touch panel 24 for detecting the touch position of the operator (user), signals from the plurality of buttons 25, data read from the HDD 40, and the like are input to the electronic control unit 30 through the input port. From the electronic control unit 30, a display signal to the display 22, an audio signal to the speaker 26 with a built-in amplifier, data to be written to the HDD 40, and the like are output via an output port. The electronic control unit 30 is connected to the in-vehicle network via a communication port in order to receive various signals from the in-vehicle device 12 and transmit data related to the state of the navigation device 20 to the vehicle side. The signal from the in-vehicle device 12 includes a signal from a GPS receiver 50 that receives a signal from a GPS (Global Positioning System) satellite via a GPS antenna, and a pulse signal every time a vehicle drive shaft or wheel rotates a certain amount. For example, a signal from a direction sensor 54 constituted by a gyro sensor for detecting the traveling direction of the vehicle and its change. Furthermore, the electronic control unit 30 is a vehicle communication device for exchanging information with an information center of a road traffic information communication system that distributes traffic information via a vehicle detector (light beacon or radio beacon) installed on the road. 58 via a communication port. Here, the traffic information includes traffic jam information, construction information, and the like, and the traffic jam information includes a traffic jam degree indicating a level of traffic jam for a road targeted for traffic jam information among the roads. In the embodiment, the degree of traffic congestion is represented by one of three stages: “no traffic jam”, “congestion (low traffic jam level)”, and “traffic jam (high traffic jam level)”.

  In the navigation device 20 of the embodiment, the electronic control unit 30 reads out necessary application software and map data from the HDD 40 and executes various processes. For example, as shown in the functional block of FIG. 1 representing functions realized by hardware or software or a combination thereof, the electronic control unit 30 is based on a signal from the GPS receiver 50, a signal from the direction sensor 54, or the like. From the location processing by the location processing unit 60 that determines the vehicle position that is the current position of the vehicle, the map display processing by the map display processing unit 62 that displays a map on the display 22 using map data, and the determined vehicle position A travel route to the destination is searched and a map display by the map display processing unit 62, a navigation process by the navigation processing unit 64 that provides route guidance by voice output from the speaker 26, and a predicted arrival time of the destination on the travel route are displayed. The predicted arrival time processing by the predicted arrival time processing unit 68 is executed.The map data is stored in the HDD 40 and includes road information and facility information. The road information includes, for example, the position (latitude and longitude), the length (distance), the type, and the like on the map indicated by the nodes at both ends of each road, along with the number (identification number) of each road (each link). In the embodiment, there are three types of road types: highways, national roads, and general roads other than national roads, and a reference vehicle speed for each type is determined in advance along with the road type and stored in the HDD 40 as data. did.

  Next, the operation of the navigation device 20 of the embodiment configured as described above, particularly the operation when displaying and updating the predicted arrival time of the destination on the travel route when the travel route of the vehicle is set will be described. FIG. 2 is a flowchart showing an example of an estimated arrival time display processing routine executed by the estimated arrival time processing unit 68 of the electronic control unit 30. This routine is executed every predetermined time (for example, 1 minute) from when the travel route from the departure point to the destination is set by the navigation process until when the vehicle reaches the destination on the travel route and ends the navigation process. Repeatedly every or every few minutes).

  When the predicted arrival time display processing routine of FIG. 2 is executed, the CPU 32 of the electronic control unit 30 first inputs the current vehicle position as the current location determined by the location processing and the current time (step S100). A process of inputting traffic jam information on the road on the travel route from the input current location to the destination is executed (step S110). When this routine is executed for the first time, the current location is the departure location on the set travel route. In the embodiment, the highway, the national road, and the general road are transmitted from the information center for two types of the highway and the national road that are subject to the congestion information except for the general road that is not the target of the congestion information. The traffic jam information is input via the communication device 58.

  When the information is input in this way, it is determined whether or not this routine is first executed (step S120). If this routine is first executed, the map data stored in the HDD 40 is stored. Based on the road information and the input traffic jam information, an estimated required time TTest estimated as the required time required for traveling from the departure place to the destination is calculated (step S130). FIG. 3 is an explanatory diagram showing an example of how the estimated required time TTest from the departure point to the destination is calculated. In the example of the figure, there are six links between the departure point and the destination on the travel route, and each link is assigned a number L1 to L6 in order from the departure point. As road information necessary for calculating the required time, in addition to the road type and length of each link, a reference speed for each road type is read from the HDD 40 as shown in the upper part of the figure. In addition, as shown in the upper part of the figure, the congestion information necessary for calculating the required time is as follows. In the congestion information entered for the expressway and national roads that are subject to the congestion information, the congestion level is “no congestion”, “congestion” ”And“ congestion ”in order, and the degree of congestion in these three stages is a speed coefficient (coefficient“ kv1 = 1.0 ”for“ no congestion ”, coefficient kv2 = 0.8 for“ congestion ”, and coefficient“ congestion ” kv3 = 0.5) and used by multiplying the reference speed. In the embodiment, the estimated required time TTest from the departure point to the destination is calculated based on the road information and the traffic jam information illustrated in FIG. 3 by calculating the required time of each link from the departure point to the destination. The calculation was performed by adding all the calculated times for each link. In the example of FIG. 3, in order to simplify the description, when the degree of congestion from the departure point to the destination is all “no congestion”, for example, the required time T1 of the link L1, which is a general road, is long. Is calculated by dividing the length (10 km) by the reference speed (20 km / h) of the general road, and the required time T2 of the link L2, which is the national road, is divided by the length (9 km) by the reference speed (30 km / h) of the national road. The required times T3 to T6 of the remaining links L3 to L6 are similarly calculated, and the sum (2.4h) of the required times T1 to T6 is calculated as the estimated required time TTest. In addition, when the traffic congestion information other than “no traffic jam” is input for some links from the current location to the destination, for example, the traffic congestion level of the link L4 which is a highway is “traffic congestion”. Sometimes, the required time T4 of the link L4 is a speed (40 km) obtained by multiplying the length (16 km) by the reference speed (80 km / h) of the expressway and the coefficient kv3 (value 0.5) of the degree of congestion “congestion”. / H) and is used to calculate the estimated required time TTest.

  When the estimated required time TTest is thus calculated, the sum of the estimated required time TTest and the current time is calculated as the predicted arrival time ETA (step S140), and the calculated predicted arrival time ETA is displayed on the display 22 (step S150). Then, the calculated time required for each link of the estimated required time TTest (the time required T1 to T6 for each link L1 to L6 in the example of FIG. 3) is stored in the flash memory 38 together with the congestion degree for each link (step S160). The actual required time TAact, which is the elapsed time from when the display of the predicted arrival time ETA was updated last time (hereinafter referred to as update time), is started from a value 0 using a timer (not shown) (step S280). End the routine. Since it is the time when the estimated arrival time ETA is first calculated and displayed at the departure place, the actual required time TAact is calculated when the estimated arrival time ETA is first calculated and displayed at the departure place. The measurement is started as the elapsed time from the time when the user is in (hereinafter referred to as the departure time). That is, the update time becomes the departure time. An example of the screen of the display 22 displaying the estimated arrival time ETA is shown in FIG. By such processing, the route guidance by the navigation processing can be started and the predicted arrival time ETA can be initially displayed on the display 22.

  If it is determined in step S120 that this routine is not executed for the first time, that is, if it is determined to be executed for the second time or later, it is necessary for the remaining travel from the current location to the destination based on the road information and the traffic jam information. The remaining estimated required time TRest estimated as time is calculated (step S170). The remaining estimated required time TRest can be calculated in the same manner as the estimated required time TTest. However, when the current location is located in the middle of the link, in the embodiment, using the location information of the current location, the time required for the entire link and the length from the current location to the end point of the link are expressed as the length of the link. The product with the ratio obtained by dividing is calculated as the required time of the link where the current location is located.

  Subsequently, whether or not the traffic information from the current location to the destination is the new traffic information, that is, the traffic level of the traffic information from the current location to the destination is updated time (the estimated arrival time ETA after the departure time). If the display has not been updated, it is determined whether or not the departure time has changed (step S180). If it is determined that the degree of congestion has changed, the sum of the calculated remaining estimated required time TRest and the current time is summed up. Is calculated as the predicted arrival time ETA (step S250), and the predicted arrival time ETA displayed on the display 22 is updated with the calculated predicted arrival time ETA (step S260). Then, the calculated required time for each link of the estimated remaining required time TRest is stored in the flash memory 38 together with the degree of congestion for each link (step S270), and the actual required time TAact, which is the elapsed time from the update time, is set from the value 0. Measurement is started (step S280), and this routine is terminated. Here, in the embodiment, the change in the degree of congestion is determined by comparing the degree of congestion for each link used for the current calculation of the remaining estimated required time TRest with the degree of congestion for each link stored at the update time. To do. With this process, when new traffic information is acquired as traffic information from the current location to the destination, the display of the predicted arrival time ETA can be updated.

  The traffic information from the current location to the destination is not new traffic information, that is, the traffic level of the traffic information from the current location to the destination is the update time (if the display of the predicted arrival time ETA has not been updated after the departure time, the departure When it is determined that the time has not changed, the actual required time TAact measured by a timer (not shown) is acquired (step S190), and the display of the predicted arrival time ETA is updated last time (hereinafter, updated). If the display of the estimated arrival time ETA is not updated after the departure time, the estimated actual travel time TAest estimated as the travel time corresponding to the section from the departure point) to the current location is calculated (step S200), the absolute value of the actual required time TAact minus the actual estimated time TAest is calculated as the difference time ΔTA. (Step S210). Here, the calculation of the actual estimated time required TAest is, as described above, in the embodiment, using the required time for each link stored at the update time and the degree of congestion, and when the current location is located in the middle of the link. It is assumed that the current location information is used for calculation.

  Subsequently, a value obtained by dividing the calculated difference time ΔTA by the remaining estimated required time TRest is calculated as a determination ratio Rt (step S220), and a determination threshold value Rref to be compared with the determination ratio Rt is set (step S230). Then, it is determined whether or not the determination ratio Rt is greater than or equal to the determination threshold value Rref (step S240). The determination threshold value Rref is set by the determination threshold value setting process of FIG.

  In the determination threshold value setting process of FIG. 5, the total travel distance LA from the update point (the departure point when the display of the predicted arrival time ETA is not updated after the departure time) to the destination, and the current location to the destination. The remaining travel distance LR, the distance of the expressway among the remaining travel distance LR (hereinafter referred to as the remaining travel highway distance) LRH, and the distance of the target road of the traffic jam information among the remaining travel distance LR (hereinafter referred to as the remaining travel congestion information target) Although it is referred to as a distance, in the embodiment, the total distance between the expressway and the national road (LRT) out of the remaining travel distance LR is used by using necessary road information (the length of each link, the positions of nodes at both ends of each link, etc.). (Step S300), a coefficient klr is set based on the remaining travel distance LR, a coefficient klrh is set based on the remaining travel highway distance LRH, and the remaining travel congestion information target distance LRT with respect to the entire travel distance LA The coefficient klrt is set based on the combination (LRT / LA) (step S310), and a predetermined initial value Rbase of the determination threshold value Rref (eg, value 0.05, value 0.1, value 0.2, etc.) Is multiplied by the coefficient klr, the coefficient klrh, and the coefficient klrt as the determination threshold value Rref (step S320), and the determination threshold value setting process ends. In the embodiment, the coefficient klr, the coefficient klrh, and the coefficient klrt are the remaining travel distance LR, the remaining travel highway distance LRH, the ratio of the remaining travel congestion information target distance LRT to the total travel distance LA (LRT / LA), the coefficient klr, Each relationship between the coefficient klrh and the coefficient klrt is determined in advance and stored in the RAM 36 as a coefficient setting map, and the remaining travel distance LR, remaining travel highway distance LRH, and ratio (LRT / LA) are stored in the stored map. It was assumed to set what was derived and given. An example of a coefficient setting map based on the remaining travel distance LR is shown in FIG. 6, an example of a coefficient setting map based on the remaining travel highway distance LRH is shown in FIG. 7, and a coefficient setting map based on the ratio (LRT / LA) An example of this is shown in FIG. As shown in FIG. 6, the coefficient klr has a value that tends to increase as the remaining travel distance LR increases. As illustrated in FIG. 7, the coefficient krlh increases as the remaining travel highway distance LRH increases. As shown in FIG. 8, the coefficient krlt is determined such that the larger the ratio (LRT / LA), that is, the longer the remaining travel congestion information target distance LRT is, the larger the tendency is. ing. In the embodiment, the coefficient klr, the coefficient klrh, and the coefficient klrt are all set to positive values that change in the vicinity of the value 1. The reason (effect) for determining each coefficient in such a tendency will be described later.

  When the determination ratio Rt is equal to or greater than the determination threshold Rref, the predicted arrival time ETA displayed on the display 22 is updated with the predicted arrival time ETA calculated as the sum of the remaining estimated required time TRest and the current time (step S250). , S260), the required time for each link of the calculated remaining estimated required time TRest is stored in the flash memory 38 together with the congestion degree for each link (step S270), and the actual required time TAact, which is the elapsed time from the update time, is set as the value. Measurement starts from 0 (step S280), and this routine ends. By such processing, when the determination ratio Rt is equal to or greater than the determination threshold Rref, the display of the predicted arrival time ETA can be updated.

  On the other hand, when the determination ratio Rt is less than the determination threshold value Rref, this routine is terminated without updating the display of the predicted arrival time ETA.

  FIG. 9 shows that when the display of the predicted arrival time ETA has not been updated after the departure time, the remaining estimated required time TRest and the actual estimated required time TAest are calculated, and the determination ratio Rt and the determination threshold Rref are calculated. It is explanatory drawing which shows the example of a mode that it compares. In the figure, the same data as in FIG. 3 is used in the upper frame, but the current location is the end point of the link L3 (start point of the link L4). In the example of FIG. 9, it is considered that the degree of congestion from the departure point to the destination is “no congestion”, and the estimated remaining time TRest from the current position to the destination is the link L4 to L6 at the current time. It is newly calculated as the sum of the required times T4 to T6. The actual estimated required time TAest is calculated using the required time for each link stored at the departure time and the degree of congestion (all “no traffic jam” in the example of FIG. 9), and the required times T1 to T3 for the links L1 to L3. Is calculated as the sum of Here, as illustrated in the lower part of the figure, three cases where the actual required time TAact from the departure place to the present place is 1.2 h, 1.0 h, and 0.6 h, and the determination threshold Rref is 0.1 ( That is, the case of 10%) is considered as an example. In the first case of 1.2 h in which the actual required time TAact is significantly delayed from the initial prediction, the difference (0.3 h) between the actual required time TAact (1.2 h) and the actual estimated required time TAest (0.9 h). ) Is calculated as an absolute value, and a determination ratio Rt is calculated as a ratio (value 0.2) of the difference time ΔTA (0.3 h) to the remaining estimated required time TRest (1.5 h). The determination ratio Rt is determined to be greater than or equal to the determination threshold Rref, and the display of the predicted arrival time ETA is updated. In the second case of 1.0 h in which the actual required time TAact is slightly delayed from the initial prediction, the difference (0.1 h) between the actual required time TAact (1.0 h) and the actual estimated required time TAest (0.9 h). ) Is calculated as an absolute value, and a determination ratio Rt is calculated as a ratio of the difference time ΔTA (0.1 h) to the remaining estimated required time TRest (1.5 h) (approximately 0.07). The determination ratio Rt is determined to be less than the determination threshold Rref, and the display of the predicted arrival time ETA is not updated. In the third case of 0.6h in which the actual required time TAact is significantly faster than the initial prediction, the difference between the actual required time TAact (0.6h) and the actual estimated required time TAest (0.9h) (−0. 3h) is calculated as a difference time ΔTA, and a determination ratio Rt is calculated as a ratio (value 0.2) of the difference time ΔTA (0.3h) to the remaining estimated required time TRest (1.5h). The determination ratio Rt is determined to be greater than or equal to the determination threshold Rref, and the display of the predicted arrival time ETA is updated. In the example of FIG. 9, as a case where the degree of traffic congestion from the departure point to the destination is other than “no traffic jam”, for example, “no traffic jam” on some links from the departure point to the current location as traffic jam information at the departure time. Considering a case where the degree of congestion other than “congestion” or “congestion” has been acquired, the actual estimated estimated time TAest from the departure location to the current location is a time reflecting the congestion degree at the departure time.

  Thus, in the navigation device 20 as the predicted arrival time display system of the embodiment, the remaining estimated required time TRest from the current location to the destination is calculated, and the actual required time TAact from the departure location to the current location is measured and acquired. Then, of the estimated required time TTest from the departure place to the destination, the actual estimated required time TAest corresponding to the section from the departure place to the current location is calculated. When the determination ratio Rt, which is the ratio of the difference time ΔTA between the actual required time TAact and the actual estimated required time TAest to the remaining estimated required time TRest, is equal to or greater than the determination threshold Rref, the remaining estimated required time TRest The display of the predicted arrival time ETA is updated based on the current time, and when the determination rate Rt is less than the determination threshold Rref, the display of the predicted arrival time ETA is not updated. Therefore, as the difference time ΔTA between the actual required time TAact and the actual estimated required time TAest is smaller and the remaining estimated required time TRest is longer, the display of the predicted arrival time ETA is less likely to be updated. In other words, even if the difference time ΔTA between the actual required time TAact and the actual estimated time TAest is relatively large, that is, when the degree of delay or advance caused by the travel from the departure place to the current location is large, the residual estimation is required. When the time TRest is relatively long, that is, when the actual arrival time is likely to be earlier or later due to future travel from the current location to the destination, and even if the predicted arrival time is predicted, the prediction accuracy is low The display of the predicted arrival time ETA is not easily updated. As a result, even if the predicted arrival time ETA is predicted, the display of the predicted arrival time ETA is suppressed when the prediction accuracy is low, and the display of the predicted arrival time ETA is suppressed from being frequently updated. It is possible to update the display of the predicted arrival time ETA more appropriately. Of course, the closer to the destination, the more accurately the predicted arrival time ETA can be updated.

  Further, the determination threshold Rref is set to increase with the coefficient klr as the remaining travel distance LR from the current location to the destination is longer. As a result, the longer the remaining travel distance LR, the more difficult it is to update the display of the predicted arrival time ETA. Therefore, when the predicted remaining arrival time ETA is long and the prediction accuracy is low, the predicted arrival time It is possible to suppress the display of the ETA from being updated.

  Further, the determination threshold Rref is set to increase with the coefficient klrh as the remaining traveling highway distance LRH, which is the distance of the expressway in the remaining traveling distance LA from the current location to the destination, is longer. As a result, it is possible to make it difficult to update the display of the predicted arrival time ETA as the distance of the remaining highway in the travel route is longer, that is, as the delay is easily recovered by future travel from the current location to the destination.

  In addition, when new traffic information is acquired, the display of the predicted arrival time ETA is updated regardless of the determination ratio Rt (regardless of the determination ratio Rt). As a result, it is possible to reset the delay or advance with respect to the predicted arrival time ETA being displayed that has occurred within the range below the determination threshold Rref until new traffic information is acquired, and new traffic information is acquired. The display of the estimated arrival time ETA can be updated to a time with higher prediction accuracy by using the determined timing. The larger the ratio (LRT / LA) of the remaining travel congestion information target distance LRT that is the distance of the target road of the traffic congestion information to the total travel distance LA in the remaining travel distance LR from the current position to the destination, the coefficient klrt The determination threshold value Rref was set to increase. As a result, the higher the possibility that new traffic information will be acquired in the future, that is, the higher the possibility that the delay or advance with respect to the predicted arrival time ETA being displayed can be reset, the more the expected arrival time ETA is displayed. Since it is difficult to update, the predicted arrival time ETA can be updated more appropriately.

  In the navigation device 20 as the arrival time display system of the embodiment described above, the estimated required time TTest from the departure place to the destination on the travel route is calculated, and the estimated required time TTest and the estimated required time TTest are calculated. Based on the above, a predicted arrival time ETA of the destination is calculated and displayed on the display 22. In addition, the actual required time TAact from the starting point to the present location is measured and obtained, and the estimated actual required time TAest corresponding to the section from the starting point to the present location is calculated from the estimated required time TTest, The remaining estimated required time TRest is calculated. When the determination ratio Rt, which is the ratio of the difference time ΔTA between the actual required time TAact and the actual estimated time TAest, to the remaining estimated required time TRest is equal to or greater than the determination threshold Rref, the remaining estimated required time TRest and the current time The predicted arrival time ETA displayed on the display 22 is updated based on the time, and when the determination ratio Rt is less than the determination threshold Rref, the predicted arrival time ETA displayed on the display 22 is not updated. As a result, even if the predicted arrival time ETA is predicted, the display of the predicted arrival time can be suppressed from being updated when the accuracy of the prediction is low, and the display of the predicted arrival time ETA is frequently updated. Is suppressed, and the display of the predicted arrival time ETA can be updated more appropriately.

  In the navigation device 20 of the embodiment, the determination threshold value Rref is multiplied by the initial value Rbase by a coefficient klr based on the remaining travel distance LR, klrr based on the remaining travel highway distance LRH, and a coefficient klrt based on the remaining travel congestion information target distance LRT. The initial value Rbase may be set by multiplying only a part of the coefficient klr, the coefficient klrh, and the coefficient klrt, or the initial value Rbase may be used as it is. Further, when a coefficient based on the remaining travel congestion information target distance LRT is used, the determination threshold Rref is also obtained as the sum of the ratio (LRT / LA) of the remaining travel congestion information target distance LRT to the total travel distance LA and the initial value Rbase. Good.

  In the navigation device 20 of the embodiment, the determination threshold value Rref is set so as to increase as the highway distance (remaining traveling highway distance) LRH increases in the remaining traveling distance LA. Among them, the distance may be set so as to decrease as the distance of the general road (the sum of the distance between the national road and the general road in the embodiment) increases.

  In the navigation device 20 of the embodiment, when new traffic information is acquired, that is, when the traffic level of the traffic information from the current location to the destination changes from the update time, the predicted arrival time ETA regardless of the determination rate Rt. The display is updated, but instead of this, an increase amount ΔTJ from the update time of the congestion level from the current location to the destination is calculated, and a value that tends to increase as the increase amount ΔTJ of the congestion level increases is determined. The threshold value Rref may be set, and the display of the predicted arrival time ETA may be updated when the determination ratio Rt is equal to or greater than the determination threshold value Rref. Here, the increase amount ΔTJ of the degree of congestion can be calculated as, for example, an increase amount of the required time from the current location to the destination. In this case, using the coefficient setting map of FIG. 10, a coefficient ktj that changes in the vicinity of value 1 is set so as to increase as the increase degree ΔTJ of the degree of congestion increases, and the product of the set coefficient ktj and the initial value Rbase Can be set as the determination threshold value Rref. In addition to the coefficient ktj, the determination threshold Rref is set by further multiplying the coefficient klr based on the remaining travel distance LR illustrated in FIG. 6 and the coefficient klrh based on the remaining travel highway distance LRH illustrated in FIG. It does not matter. As a result, it is possible to suppress the display of the predicted arrival time ETA from being updated when it is considered that the prediction accuracy is relatively low even if the predicted arrival time ETA is predicted due to an increase in the degree of congestion. it can. Note that the increase amount ΔTJ is set to a positive value when the degree of congestion is increased, and the increase amount ΔTJ is set to a negative value when the degree of congestion is decreased, thereby reducing the prediction accuracy of the arrival prediction time ETA due to the decrease in the degree of congestion. Can also respond.

  In the navigation device 20 of the embodiment, when new traffic information is acquired, that is, when the traffic level of the traffic information from the current location to the destination changes from the update time, the predicted arrival time ETA regardless of the determination rate Rt. The display is updated, but instead of this, the increase amount ΔTJ from the update time of the congestion level from the current location to the destination is calculated, and the value that tends to decrease as the increase amount ΔTJ of the congestion level increases is determined. The threshold value Rref may be set, and the display of the predicted arrival time ETA may be updated when the determination ratio Rt is equal to or greater than the determination threshold value Rref. Here, the increase amount ΔTJ of the degree of congestion can be calculated as, for example, an increase amount of the required time from the current location to the destination. In this case, using the coefficient setting map of FIG. 11, a coefficient ktj that changes in the vicinity of value 1 is set so as to decrease as the increase amount ΔTJ of the degree of congestion increases, and the product of the set coefficient ktj and the initial value Rbase Can be set as the determination threshold value Rref. In addition to the coefficient ktj, the determination threshold Rref is set by further multiplying the coefficient klr based on the remaining travel distance LR illustrated in FIG. 6 and the coefficient klrh based on the remaining travel highway distance LRH illustrated in FIG. It does not matter. This makes it easier to update the display of the predicted arrival time ETA when it is considered that the required time in the future from the current location to the destination will be relatively long due to an increase in the degree of congestion. The increase amount ΔTJ is set to a positive value when the congestion level increases, and the increase amount ΔTJ is set to a negative value when the congestion level decreases, so that the estimated arrival time ETA is displayed even when the congestion level decreases. Can be updated easily.

  In the navigation device 20 of these two modified examples, the determination threshold value Rref is set to a value that tends to increase or decrease as the increase degree ΔTJ of the congestion degree increases, and the determination ratio Rt is greater than or equal to the determination threshold value Rref. Although the display of the predicted arrival time ETA is updated, two threshold values for determination may be set according to the increase amount ΔTJ of the degree of congestion and used for comparison with the ratio for determination. For example, when the amount of increase in traffic congestion ΔTJ tends to increase, the threshold value on the side for determining the delay sets a small absolute value and the threshold value on the side for determining the advance sets a large absolute value. This makes it easy to update the display of the predicted arrival time ETA and makes it difficult to update the display of the predicted arrival time ETA with respect to progress, or delays when the increase in traffic congestion degree ΔTJ tends to decrease. The threshold value on the side for determining the advance is set to a large absolute value, and the threshold value on the side for determining the advance is set to a small absolute value. For delay, it is difficult to update the display of the predicted arrival time ETA and May make it easier to update the display of the estimated arrival time ETA. In this case, the determination ratio to be compared with the threshold is a ratio of the difference time to the remaining estimated required time TRest by obtaining a time that takes a positive / negative value as the difference time between the actual required time TAact and the actual estimated time TAest. Can be calculated as

  In the navigation device 20 of the embodiment, the estimated required time TTest and the remaining estimated required time TRest are calculated based on the traffic jam information, or when the new traffic jam information is acquired, regardless of the determination ratio Rt, the estimated arrival time ETA is calculated. Although the display is updated, the estimated required time TTest and the remaining estimated required time TRest are calculated and the estimated arrival time ETA is displayed and the display is updated without considering the traffic jam information. It is good also as something to do.

  In the navigation apparatus 20 of the embodiment, the predicted arrival time display processing routine is repeatedly executed every predetermined time. However, for example, it may be repeatedly executed every predetermined distance (for example, every several hundred meters). .

  In the navigation device 20 of the embodiment, the estimated remaining time TRest from the current location to the destination is newly calculated every time based on the road information and the traffic jam information. When the traffic information is not acquired, the estimated required time TAest is calculated first, and the estimated required time TRest is calculated by subtracting the estimated estimated time TAest from the estimated required time TTest. The remaining estimated required time TRest may be calculated using the time TTest.

  In the navigation device 20 of the embodiment, the arrival prediction is performed when the determination ratio Rt, which is the ratio of the difference time ΔTA between the actual required time TAact and the actual estimated required time TAest to the remaining estimated required time TRest, is greater than or equal to the determination threshold Rref. The display of the time ETA is updated, but instead of this, the difference travel distance between the vehicle arrival point and the current location assumed when calculating the estimated required time TTest from the departure location to the destination is changed from the current location to the destination. The ratio of the remaining travel distance to the ground may be calculated as a determination ratio, and the display of the predicted arrival time ETA may be updated when the determination ratio is equal to or greater than the determination threshold.

  In the embodiment, the estimated arrival time display system of the present invention is applied to the navigation device 20 including the display 22 or the like. For example, the electronic control unit 30 is connected to a server communicably connected to the navigation device including the display or the like. The function of the predicted arrival time processing unit 68 of the present invention is implemented in whole or in part so that this server functions as the predicted arrival time display system of the present invention. It is good also as what makes a display system function. Moreover, it is good also as what replaces with the navigation apparatus 20 and functions a portable terminal and another vehicle-mounted apparatus as an estimated arrival time display system of this invention.

  Further, in the embodiments, the present invention is in the form of an estimated arrival time display system, but may be in the form of an estimated arrival time display method, and each step of the estimated arrival time display method may be realized by one or more computers. The program may be in the form of

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the electronic control unit 30 (estimated arrival time processing unit 68) that executes the process of step S130 of the predicted arrival time display processing routine of FIG. 2 for calculating the estimated required time TTest from the departure place to the destination is “estimated”. The electronic control unit 30 (corresponding to “required time calculation means”), which calculates the sum of the estimated required time TTest and the current time as the predicted arrival time ETA and displays it on the display 22 in steps S140 and S150 of the routine. The predicted arrival time processing unit 68) corresponds to “estimated arrival time display processing means”, and executes the processing of step S190 of the routine for obtaining the actual required time TAact from the update point to the current location (arrival prediction). The time processing unit 68) corresponds to “actual time acquisition means” and requires estimation of the remaining amount from the current location to the destination. The electronic control unit 30 (estimated arrival time processing unit 68) that executes the process of step S170 of the same routine for calculating the interval TRest corresponds to “remaining estimation required calculation means”, and the actual required time TAact and the actual estimated time required The electronic control unit 30 that executes the processing of S240 to S260 of the same routine that updates the display of the predicted arrival time ETA when the determination ratio Rt with respect to the remaining estimated required time TRest of the difference time ΔTA from TAest is equal to or greater than the determination threshold Rref. The (predicted arrival time processing unit 68) corresponds to “predicted arrival time updating means”. In addition, the electronic control unit 30 (predicted arrival time processing unit 68) that executes the process of step S110 of the routine for inputting the traffic jam information from the current location to the destination corresponds to the “traffic jam information acquisition unit”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the manufacturing industry of a predicted arrival time display system.

  12 on-vehicle equipment, 20 navigation device, 22 display, 24 touch panel, 25 button, 26 speaker, 30 electronic control unit, 32 CPU, 34 ROM, 36 RAM, 38 flash memory, 40 hard disk drive (HDD), 50 GPS receiver, 52 vehicle speed sensor, 54 direction sensor, 58 communication device, 60 location processing unit, 62 map display processing unit, 64 navigation processing unit, 68 arrival prediction time processing unit.

Claims (11)

An estimated arrival time display system for calculating an estimated arrival time of a destination on the travel route using road information of the travel route when a travel route of the vehicle is set, and displaying the arrival time on a display unit,
An estimated required time calculating means for calculating an estimated required time from the starting point on the travel route to the destination;
An estimated arrival time display processing unit that calculates an estimated arrival time of the destination based on the estimated required time and the time at which the estimated required time is calculated, and displays the estimated arrival time on the display unit;
An actual required time acquisition means for acquiring an actual required time from the departure place to the present location;
Of the estimated required time, an actual estimated required time calculating means for calculating an actual estimated required time corresponding to a section from the departure place to the current location;
A remaining estimated required time calculating means for calculating a remaining estimated required time from the current location to the destination;
When the determination ratio, which is the ratio of the difference between the actual required time and the actual estimated required time to the remaining estimated required time, is equal to or greater than a threshold, the display is performed based on the remaining estimated required time and the current time. An estimated arrival time updating means for updating the estimated arrival time displayed in the section;
An estimated arrival time display system. An estimated arrival time display system according to claim 1,
The threshold is a value that tends to increase as the remaining travel distance from the current location to the destination increases.
Estimated arrival time display system. An estimated arrival time display system according to claim 1 or 2,
It has traffic information acquisition means to acquire traffic information including the traffic level that is the degree of traffic on the road,
The estimated required time calculating means is means for calculating the estimated required time based on the traffic jam information acquired by the traffic jam information acquiring means at the departure time at the departure place,
The estimated arrival time update means is means for updating the estimated arrival time displayed on the display unit when new congestion information is acquired by the congestion information acquisition means, regardless of the determination ratio.
Estimated arrival time display system. An estimated arrival time display system according to claim 3,
The threshold value is a value that tends to increase as the distance of the road that is the target of the traffic jam information becomes longer in the remaining travel distance from the current location to the destination.
Estimated arrival time display system. An estimated arrival time display system according to claim 1 or 2,
It has traffic information acquisition means to acquire traffic information including the traffic level that is the degree of traffic on the road,
The estimated required time calculating means is means for calculating the estimated required time based on the traffic jam information acquired by the traffic jam information acquiring means at the departure time at the departure place,
The predicted arrival time updating means, when new traffic information is acquired by the traffic information acquisition means, a value corresponding to a change from the departure time of the traffic level corresponding to a section from the current location to the destination Is used as the threshold value,
Estimated arrival time display system. An estimated arrival time display system according to claim 5,
The estimated arrival time update means, when new traffic information is acquired by the traffic information acquisition means, the greater the increase from the departure time of the traffic level corresponding to the section from the current location to the destination A means of using a value of a tendency to increase as the threshold;
Estimated arrival time display system. An estimated arrival time display system according to claim 5,
The estimated arrival time update means, when new traffic information is acquired by the traffic information acquisition means, the greater the increase from the departure time of the traffic level corresponding to the section from the current location to the destination A means of using a value of a tendency to decrease as the threshold;
Estimated arrival time display system. An estimated arrival time display system according to any one of claims 1 to 7,
The threshold value is a value that tends to increase as the distance of the expressway is longer among the remaining travel distance from the current location to the destination.
Estimated arrival time display system. An estimated arrival time display system according to any one of claims 1 to 8,
The estimated required time calculation means, after the update time when the predicted arrival time displayed on the display unit is first updated, from the update point where the predicted arrival time displayed on the display unit was updated last time, Means for calculating the estimated required time until
The actual required time acquisition means is means for acquiring the actual required time from the update point to the current location after the update time,
The actual estimated time required calculation means is means for calculating the estimated actual required time corresponding to a section from the update point to the current location in the estimated required time after the update.
Estimated arrival time display system. A predicted arrival time display method for calculating a predicted arrival time of a destination on the travel route using road information of the travel route when the travel route of the vehicle is set, and displaying it on the display unit,
(A) calculating an estimated required time from the starting point on the travel route to the destination;
(B) calculating an estimated arrival time of the destination based on the estimated required time and the calculated time, and displaying the estimated arrival time on the display unit;
(C) obtaining an actual required time from the departure location to the current location;
(D) calculating an actual estimated required time corresponding to a section from the departure place to the current location in the estimated required time;
(E) calculating an estimated remaining time from the current location to the destination;
(F) When a ratio for determination, which is a ratio of the difference between the actual required time and the actual estimated time required, to the remaining estimated required time is equal to or greater than a threshold, based on the remaining estimated required time and the current time Updating the predicted arrival time displayed on the display unit,
An estimated arrival time display method including   A program for causing one or more computers to realize each step of the predicted arrival time display method according to claim 10.

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