JP2009210396A - Onboard display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate visual recognition of an arrival point of an own vehicle. <P>SOLUTION: On a road in a driving direction of the own vehicle, the arrival points of the own vehicle are estimated at constant time intervals based on the position information of the own vehicle and road attribute data included in map data (S210), and the image in which each estimated arrival point is depicted on a map is displayed on a display screen of a display device 21 (S214). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an in-vehicle display device that displays a position of a host vehicle on a map.

Conventionally, an arrow is drawn in a predetermined color from the end of the traffic jam on the map to the head of the traffic jam based on the traffic jam information, and a part of the arrow is different from the color of the drawn arrow from the start point of the arrow to the end point There is a map display device that is sequentially moved toward the camera (for example, see Patent Document 1).
JP 2007-113937 A

  The device described in Patent Document 1 can visually recognize a location that is congested due to traffic congestion from the display, but cannot recognize when and where the host vehicle reaches.

  The present invention has been made in view of the above points, and an object of the present invention is to make it possible to visually recognize when and where the host vehicle reaches.

  In order to achieve the above object, the invention described in claim 1 is directed to a host vehicle position information acquisition unit that acquires host vehicle position information for specifying a position of the host vehicle, and a road where the host vehicle is traveling. Based on the own vehicle position information and road attribute data included in the map data, the arrival point estimation means for estimating the arrival point at every fixed time interval where the own vehicle is located, and each arrival point estimated by the arrival point estimation means And display control means for displaying the image drawn on the display unit.

  According to such a configuration, the arrival point for each fixed time interval where the own vehicle is located is estimated based on the road attribute data included in the own vehicle position information and the map data with respect to the road where the own vehicle is traveling, Since an image in which each arrival point is drawn on the map is displayed on the display unit, the user can visually recognize when and where the host vehicle reaches.

  The invention according to claim 2 has a route search function for searching for a guide route from the position of the host vehicle to the destination, and the arrival point estimation means is provided for the guide route searched by the route search function. It is characterized in that the arrival point at every fixed time interval where the host vehicle is located is estimated.

  In such a configuration, the arrival points at certain time intervals where the host vehicle is located with respect to the guidance route are estimated, and an image in which each arrival point is drawn on the map is displayed on the display unit. The arrival point for every fixed time interval can be visually recognized.

  Further, the invention described in claim 3 is characterized in that the display control means changes the display color of each arrival point estimated by the arrival point estimation means stepwise according to the arrival time.

  In this way, by making the display color of each estimated arrival point different in a stepwise manner according to the arrival time, it is possible to make it easier to imagine when and where the host vehicle reaches.

  According to a fourth aspect of the present invention, a correction for calculating a correction coefficient representing a ratio between a passage time of a specific section that the vehicle has traveled until reaching the current position and a passage time of the specific section estimated in advance. Coefficient calculation means is provided, and the arrival point estimation means corrects arrival points at fixed time intervals where the host vehicle is located using the correction coefficient calculated by the correction coefficient calculation means.

  In such a configuration, a constant vehicle position is determined by using a correction coefficient that represents a ratio between the passage time of the specific section traveled until the host vehicle reaches the current position and the passage time of the specific section estimated in advance. Since the arrival point for each time interval is corrected, it is possible to reflect the traveling state until the host vehicle reaches the current position in the estimation of the arrival point for each fixed time interval where the host vehicle is located.

(First embodiment)
FIG. 1 shows a configuration of a map display device according to an embodiment of the present invention. The map display device is configured as a navigation device 1. The navigation device 1
A position detector 10, a map data input device 15, an operation unit 16, an external memory 20, a display device 21, a speaker 22, a VICS receiver 23, and a control unit 24 are provided.

  The position detector 10 has sensors such as a well-known geomagnetic sensor 11, a gyroscope 12, a distance sensor 13, and a GPS receiver 14, and information for specifying the current position and direction of the vehicle from these sensors. Is output to the control unit 24.

  The map data input device 15 is a device for inputting map data for map display and route search to the control unit 24. The map data input device 15 reads necessary map data from a non-volatile storage medium such as a CD, DVD, or hard disk drive in which map data is stored in response to a request from the control unit 24.

  Map data includes road attribute data indicating the distance of each link, road type, number of lanes, traffic signal position, so-called map matching data for improving position detection accuracy, rivers, lakes, seas, railways, facilities, etc. This includes background data representing the position, shape, name, facility data representing the name, location, and facility type of each facility.

  The operation unit 16 includes an operation switch group 17 including a push button switch provided around the display screen of the display device 21 and a touch switch provided in front of the display screen, and infrared rays based on a user operation. And the like, and a remote control sensor 19 that outputs a signal received from the operation remote control 18 to the control unit 24.

  The external memory 20 is a memory provided separately from a RAM and a ROM provided in the control unit 24 described later, and is configured by a nonvolatile storage medium such as a flash memory.

  The display device 21 has a display screen such as a liquid crystal, and displays a video corresponding to the video signal input from the control unit 24 on the display screen. The speaker 22 outputs sound corresponding to the sound signal input from the control unit 24.

  The VICS receiver 23 is a wireless receiver that receives VICS data wirelessly transmitted from an FM radio broadcasting station or a VICS transmitter such as a roadside device installed along a road and outputs the VICS data to the control unit 24. The VICS data includes traffic jam information and traffic regulation information.

  The control unit 24 is configured as a computer including a CPU, a RAM, a ROM, an I / O, and the like, and the CPU performs various processes according to a program stored in the ROM.

  As processing of the control unit 24, current position specifying processing for specifying the current position and direction of the vehicle based on information for specifying the current position and direction of the vehicle input from the position detector 10, Map display processing for acquiring map data from the map data input device 15 and displaying a vehicle position mark on a map around the vehicle position, and destination search processing for searching for a destination according to the operation of the operation unit 16 by the user , Processing for implementing a route search function for searching for a guidance route from the departure point (current position) to the destination using the Dijkstra method, processing for implementing a route guidance function for performing route guidance according to the guidance route, etc. There is.

  The navigation device 1 according to the present embodiment estimates arrival points at fixed time intervals (for example, 1 minute) where the host vehicle is located with respect to the guidance route, and displays an image in which each arrival point is drawn on the map. Execute the process to be displayed on the display.

  FIG. 2 shows a flowchart of this process. When the ignition switch of the vehicle is turned on, the navigation device 1 is in an operating state, and the control unit 24 performs the process shown in FIG. Here, it is assumed that a route search process is performed in accordance with a user operation and a guidance route has already been searched.

  First, 1 is substituted into the correction coefficient α as an initial value (S100). The correction coefficient α is a ratio of the passage time of the specific section that the vehicle has traveled until reaching the current position and the passage time of the specific section estimated in advance. Is used to reflect the traveling characteristics until the host vehicle reaches the current position.

  Next, it is determined whether or not VICS data has been received via the VICS receiver 23 (S102). The VICS data includes traffic jam information, traffic regulation information, and the like related to the VICS target link.

  When the VICS data is not received, the process proceeds to the drawing / calculation process (S200). When the VICS data is received, the received VICS data is stored in the external memory 20 (S104), and the drawing / calculation process (S200). Go to).

  FIG. 3 shows a flowchart of the drawing / calculation process. In this drawing / calculation process, first, the correction coefficient α is updated (S202). Specifically, the correction coefficient α representing the ratio between the passage time Tm of the specific link that has traveled until the host vehicle reaches the current position and the passage time Tn of the specific link estimated in advance is calculated. The correction coefficient α can be calculated as Tm / Tn. Here, it is assumed that the correction coefficient α = 1.

  Hereinafter, the processing of S204 to S212 is sequentially repeated for each link from the link where the host vehicle is located to the destination for the guidance route, and an image in which the arrival points at fixed time intervals are drawn on the map is generated. Perform the process.

  In S204, it is determined whether the link where the own vehicle is located is a corresponding link, and the corresponding link is a VICS target link (S204). Whether or not the link is a VICS target link can be determined by referring to the VICS data stored in the external memory 20.

  If the link is not a VICS target link, the predicted travel speed is specified from the road attribute data of the link (S208). This predicted traveling speed is specified according to the type of road on which the vehicle is traveling. For example, it is specified as 100 km / h on a highway, 60 km / h on a national road, and 30 km / h on a narrow street, and the process proceeds to S210.

  If the link is a VICS target link, the VICS data stored in the external memory 20 is referenced to identify whether the link is in a traffic jam, and the predicted travel speed is identified according to the traffic jam status (S206). . For example, if there is no traffic on the highway, 100 km / h, 50 km / h if the highway is congested, 20 km / h if the highway is congested, and The predicted traveling speed is specified according to the traffic congestion state, such as 60 km, 30 km / h when the national road is congested, and 20 km / h when the national road is congested.

  In S210, the arrival point for every fixed time interval is calculated for the corresponding link by multiplying the predicted traveling speed by the correction coefficient α. In this embodiment, the arrival point for every 1 minute interval is calculated. Specifically, the predicted travel speed identified in S208 or S206 is multiplied by a correction coefficient α, and a value obtained by multiplying the predicted travel speed by the correction coefficient α is further multiplied by a certain time to obtain a constant time interval. The arrival point of is calculated. For example, assuming that the predicted traveling speed is 60 km / h, the correction coefficient α is 1, and the fixed time interval is 1 minute (1 hour / 60), the distance to the arrival point after the fixed time interval = 60 km / h × 1 × (1 / 60) = 1 kilometer. In this case, a point traveled for 1 kilometer from the own vehicle position on the guidance route is calculated as a destination after one minute. In this way, the arrival points at certain time intervals are calculated as follows: 1 minute, 2 minutes,... In addition, in the section where the predicted traveling speed is set to be slow due to the influence of traffic jams, the interval between the arrival points becomes shorter every certain time interval.

  Next, it is determined whether or not the arrival point has been calculated for all sections of the guidance route (S212), and the processes of S204 to S210 are repeatedly performed until the arrival point is calculated for all sections of the guidance route. .

  By repeatedly performing the processes of S204 to S210, arrival points every minute are calculated in all sections on the guidance route to the destination.

  When the arrival points are calculated for all sections of the guidance route, the determination in S212 is YES, and an image in which the calculated arrival points are drawn on the map is displayed on the display device 21 (S214). .

  FIG. 4 shows a display example of the display of the display device 21. In this figure, a guide route from the vehicle position to point D through point A, point B, and point C is shown. In addition, on the guidance route, an arrival point P after 1 minute, an arrival point P2 after 2 minutes, ..., an arrival point P20 after 20 minutes are shown. From this display, the user can easily visually recognize when and where the host vehicle reaches.

  In this figure, the map is displayed in black and white, but in reality, the guidance route is blue, the display color of the arrival points (P1 to P7) that reach within 7 minutes is black, and the arrival color exceeds 7 minutes The arrival points (P8 to P20) to be displayed are displayed in purple. As described above, the control unit 24 changes the display color of the arrival point according to the arrival time.

  In addition, the interval between the arrival points (P4 to P14) in the link from the point A to the point B is shorter than the interval between the arrival points in the other links because the link from the point A to the point B is congested. It is because it has become. Since the predicted traveling speed is set to be low for a link in a traffic jam, the interval between the arrival points is shorter than that for a link without a traffic jam. The user can also recognize a section where traffic jam occurs from the interval between the respective arrival points.

  When such an image is displayed on the display of the display device 21, the process returns to S102 of FIG.

  As shown in FIG. 2, the control unit 24 repeatedly performs the drawing / calculation processing shown in S200, and the display on the display device 21 is updated as needed.

  In addition, in S202 of the drawing / calculation process, the control unit 24 calculates a ratio between the passage time Tm of the specific link that the vehicle traveled until reaching the current position and the passage time Tn of the specific link estimated in advance. The correction coefficient α to be expressed is calculated, and the correction coefficient α is updated. For example, when the passage time Tm = 60 seconds and the passage time Tn = 50 seconds, the correction coefficient α = 60/50 = 1.2.

  In this case, in S210, the arrival point is calculated every fixed time interval with the correction coefficient α = 1.2. That is, the arrival point for each fixed time interval is calculated by multiplying the predicted traveling speed by the correction coefficient α = 1.2.

  Thus, by correcting the predicted traveling speed by multiplying by the correction coefficient α, it is possible to reflect the traveling characteristics that the vehicle has traveled until reaching the current position in the calculation of the arrival point at every fixed time interval. .

  According to the configuration described above, the arrival points at certain time intervals at which the host vehicle is located with respect to the guidance route are estimated, and the image drawn on the map of each arrival point is displayed on the map. It is possible to visually recognize the arrival points at regular time intervals on the route.

  In addition, the traffic information is acquired, and the estimated travel speed is varied according to the traffic congestion state to estimate the arrival point, so that it is possible to display the arrival point in consideration of the traffic congestion state. In addition, since the interval between the arrival points in the traffic congestion section is denser than the interval between the arrival points in the non-congested section, the user can also recognize the traffic congestion status from the interval between the arrival points. .

  In addition, this invention is not limited to the said embodiment, Based on the meaning of this invention, it can implement with a various form.

  For example, in the above-described embodiment, for the guidance route, the arrival point for each predetermined time interval is estimated, and the process of displaying each arrival point on the map on the display of the display device 21 is performed. As shown in FIG. 5, even when no guidance route is set, the arrival point at each fixed time interval is estimated for each road where the host vehicle is included in the map display range. You may make it display the image which drawn the point on the map on the display of the display apparatus 21. FIG. In addition, when there is a branch point at the travel destination, it is only necessary to estimate the arrival point for each fixed time interval assuming the case of traveling on each branch road as shown in the figure. In this way, even if the guide route is not set, the vehicle at the fixed time interval at which the vehicle is located based on the vehicle attribute information and the road attribute data included in the map data with respect to the road on which the vehicle is traveling. By estimating the arrival point and displaying an image in which each arrival point is drawn on the map on the display unit, the user can visually recognize when and where the host vehicle reaches.

  Moreover, in the said embodiment, although the arrival point was estimated by using the estimated traveling speed in a link as the same value, for example, when traffic congestion has occurred only in some sections in a link, Even if it exists, you may estimate the arrival point for every fixed time interval by making the estimated traveling speed differ in the section where the traffic jam occurs and the section where the traffic jam does not occur.

  Moreover, in the said embodiment, although the display color of the arrival point which arrives within 7 minutes and the display color of the arrival point which reaches over 7 minutes were varied, for example, there are more arrival points according to arrival time. They may be classified into stages and displayed in a number of different display colors. In this way, by making the display color of each estimated arrival point different in a stepwise manner according to the arrival time, it is possible to make it easier to imagine when and where the host vehicle reaches.

  Moreover, although the arrival point for every 1 minute interval was estimated in the said embodiment, it is not limited to a 1 minute interval, For example, a 30 second interval may be sufficient and a 10 minute interval may be sufficient. Further, the value of the constant time interval may be changed according to the user's operation.

  The correspondence between the configuration in the above embodiment and the configuration of the claims will be described. The position detector 10 corresponds to the vehicle position information acquisition unit, and S206, S208, and S210 correspond to the arrival point estimation unit. , S214 corresponds to the display control means, and S202 corresponds to the correction coefficient calculation means.

It is a figure which shows the structure of the map display apparatus which concerns on one Embodiment of this invention. It is a flowchart which shows the process of a control part. It is a flowchart of the drawing / calculation processing by the control unit. It is a figure which shows the example of a display of a display. It is a figure for demonstrating a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Navigation apparatus 10 Position detector 11 Geomagnetic sensor 12 Gyroscope 13 Distance sensor 14 GPS receiver 15 Map data input device 16 Operation part 17 Operation switch group 18 Operation remote control 19 Remote control sensor 20 External memory 21 Display apparatus 22 Speaker 23 VICS receiver 24 Control unit

Claims (4)

Own vehicle position information acquisition means for acquiring own vehicle position information for specifying the position of the own vehicle;
A destination point estimation means for estimating a destination point for each fixed time interval where the host vehicle is located based on road attribute data included in the host vehicle position information and map data with respect to the road of the host vehicle,
An in-vehicle display device comprising: display control means for displaying an image in which each of the arrival points estimated by the arrival point estimation means is drawn on the map. Has a route search function to search for a guide route from the position of the host vehicle to the destination,
The in-vehicle display according to claim 1, wherein the arrival point estimation means estimates an arrival point for each fixed time interval where the host vehicle is located with respect to the guidance route searched by the route search function. apparatus.   The in-vehicle display device according to claim 1, wherein the display control unit changes the display color of each of the arrival points estimated by the arrival point estimation unit in a stepwise manner according to the arrival time. A correction coefficient calculating means for calculating a correction coefficient that represents a ratio between the passage time of the specific section traveled until the host vehicle reaches the current position and the passage time of the specific section estimated in advance;
4. The arrival point estimating means corrects the arrival point at every fixed time interval where the host vehicle is located, using the correction coefficient calculated by the correction coefficient calculating means. The vehicle-mounted display apparatus as described in any one.

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