DE102009034376A1 - Method for map-based traffic forecasting for navigation device in vehicle, involves detecting traffic condition parameter in vehicle autonomous temporal-local continuous manner - Google Patents

Abstract

The method involves detecting a traffic condition parameter in a vehicle autonomous temporal-local continuous manner. The traffic condition in the direction of the vehicle is predicted by comparing a detected current temporary-local progression of a traffic condition parameter with associated stored historical hydrographs of the traffic condition parameter. The predicted traffic conditions are displayed as traffic survey map (V) in the vehicle, and the traffic survey map is automatically updated in predetermined intervals.

Description

The The invention relates to a method for map-based traffic forecasting for a navigation device in a vehicle, wherein vehicle autonomously at least one traffic condition parameter temporally-local continuously recorded and compared by a recorded current temporal-local course of the at least one traffic condition parameter with associated stored historical hydrographs the traffic condition parameter a traffic condition in the direction of travel of the vehicle is forecasted.

Out It is well known in the art that in today's navigation devices for vehicles historic traffic condition parameters, which stored in so-called hydrographs, evaluated and used Calculation of an arrival time on guided routes used become. The hydrographs are used for individual sections of the route saved on a digital map.

A method for such operation of navigation systems is for example from DE 100 51 777 A1 known. In this method for the dynamic prognosis of the traffic condition at least for a road network surrounding area of a respective vehicle, at least one traffic condition parameter is continuously recorded temporally-locally by the respective vehicle. By comparing the detected current temporal-local course of the at least one traffic condition parameter or at least derived therefrom traffic status indicative size with associated stored historical hydrographs from the latter each best fitting hydrograph is determined and the traffic condition represented by this is predicted in the direction of travel of the vehicle as the expected traffic condition.

Furthermore, the describes DE 100 57 796 A1 a method for vehicle-specific traffic condition forecast, in which several, a road network driving, communicating with each other and the current vehicle current local traffic condition data is determined and transmitted to other vehicles and received from other vehicles traffic condition data for a prognosis of relevant for the own vehicle traffic condition be used. In this context, the prognosis in the respective vehicle for a corresponding road network area includes a comparison of local traffic state data of other vehicles and of the own vehicle with historical hydrographs stored on the vehicle side in order to determine a best-fitting hydrograph from the latter and the traffic state represented by it as the expected traffic state for the vehicle in question.

Further, the DE 100 37 827 A1 a vehicle autonomous traffic information system having a traffic data memory, vehicle location detection means, a traffic computing unit and a display unit. In the traffic data memory, traffic-line-like traffic-bearing patterns are stored, and the traffic-computing unit is set up to carry out traffic forecasts, starting from the current vehicle location for a traffic network area contained therein. For this purpose, the traffic computer unit calculates optimal routes from the current vehicle location to network nodes of the traffic network area and the associated travel times with timely use of the stored traffic location patterns. The calculated route and / or travel time data and / or prognosis data derived therefrom are displayed via the display unit.

Also is from the DE 103 50 679 A1 A method of transition-based traffic prediction is known in which a hydrographic database is constructed taking into account dense traffic patterns at effective bottlenecks of a considered traffic route network and traffic predictions are made using current traffic measurements and comparison thereof with data from the hydrograph database. In this case, an aggregation of all traffic patterns at permanent effective bottlenecks of the considered traffic route network is performed to build the hydrograph database. Upon detection of a newly occurring, temporary effective bottleneck, an associated aggregated traffic pattern is determined and the hydrograph database is updated with it. Each aggregated traffic pattern of the hydrodynamic data band is assigned a specific travel time, and travel times for all or a selectable part of the route sections of the considered traffic route network are determined and displayed in consideration of the travel times assigned to the aggregated traffic patterns of the respective updated hydrodynamic database.

Farther are various methods and devices for displaying such Traffic information known.

For example, this describes DE 10 2004 006 688 A1 a method for displaying traffic information, wherein traffic routes are displayed in cartographic representation, a color representation of different areas with different colors and the color depending on at least one reachability parameter of the area, starting from a predetermined Starting point, is set. Furthermore, the surfaces are composed of a plurality of surface elements, whereby the reachability parameter for waypoints along defined traffic routes can be determined, and specific colors of the reachability parameter are assigned to specific value ranges. The surface elements in which there are no waypoints of defined traffic routes are assigned colors depending on the color of the spatially closest waypoint, which result from the reachability parameter determined for the waypoint taking into account the color assignment to the value ranges of the reachability parameters.

Also the DE 101 19 730 A1 discloses a method for displaying traffic information, wherein the traffic information is determined on the vehicle side and / or identified outside the vehicle, transmitted to the vehicle and displayed on a vehicle-side screen. In this case, the determination of the traffic information to be displayed comprises a determination of effective bottlenecks of a viewing traffic route network and the determined effective bottlenecks are displayed spatially resolved on the vehicle-side screen. In addition, patterns of dense traffic forming there are additionally predicted and displayed.

In addition is from the DE 101 10 549 A1 a traffic information system for vehicles on a traffic route network, wherein traffic data is determined in a traffic center, the traffic data comprising collective traffic data for a plurality of vehicles and relevant traffic data relating to a respective vehicle, and wherein collective traffic data is transmitted to the vehicles via a broadcast communication channel become. In the traffic control center, individual traffic data concerning the respective vehicle and in operative connection with the collective traffic data are determined from the collective traffic data and the relevant traffic data and transmitted to the respective vehicle via a private communication channel.

Of the Invention is based on the object, a relation to the State of the art to provide improved method of operating a navigation device, by means of which an optimized output of traffic information is realized.

The Object is according to the invention with a method solved, which specified in claim 1 features having.

advantageous Embodiments of the invention are the subject of the dependent claims.

at the method for map - based traffic forecast for a navigation device in a vehicle becomes vehicle autonomous at least one traffic condition parameter temporally-local continuously recorded and compared by a recorded current temporal-local course of the at least one traffic condition parameter with associated stored historical hydrographs the traffic condition parameter a traffic condition in the direction of travel the vehicle predicts.

According to the invention the predicted traffic condition, for example, to a freely selectable Time and / or at a freely selectable location as Verkehrsübersichtskarte displayed in the vehicle, the display of the traffic overview map Updated automatically at predeterminable time intervals becomes.

Out the generation and display of the traffic survey map results in a particularly advantageous manner, that in a simple manner a clear Visual representation of the current traffic condition possible is, whereby the determination of the traffic condition without consuming Communication means vehicle autonomous and thus independent and reliable.

embodiments The invention will be described below with reference to a drawing explained.

there shows:

1 schematically a display unit of a navigation device of a vehicle.

The only 1 shows a display unit 1 a navigation device of a vehicle, not shown, by means of which, in particular with active route guidance between a selectable start and finish position, based on a map display K a traffic network of an environment of the vehicle and a determined route between the start and the target position is optically output. For this purpose, the navigation device further comprises at least one position determination unit, for example a GPS unit, map data stored as a digital road map, a communication unit, memory devices and at least one processing unit.

Around a user of the vehicle information about traffic conditions in the environment in which the vehicle during a presumable forecast period, all foresight moves to indicate a map-based traffic forecast is executed.

At least one traffic condition parameter will be automatically added to this traffic forecast ter, preferably a speed of the vehicle, temporally-localized and continuously recorded and stored for individual sections, in particular in a special database of the navigation device temporally-local and also continuously. The database is preferably one from the published patent application DE 103 50 679 A1 Applicant's known history database uses.

Out these temporally-localized speed values are speed profiles for the individual sections in the form of so-called hydrographs, d. H. as dynamic time-dependent Speed information, at any time and Place created and saved. These historical speed profiles can also be considered historical dynamic travel time profiles stored in the stored map database in the vehicle.

Based a comparison of a recorded current and temporal-local Course of the speed with associated stored historical hydrographs of speed becomes a traffic condition predicted in the direction of travel of the vehicle. This comparison takes place in such a way that for a current vehicle position historical speed profiles stored in the past for the current vehicle position and a current time be evaluated.

Subsequently the historical speed profile becomes the forecast of the traffic condition chosen which matches most with the recorded current and temporal-local course the speed has. The selection of the after is done Kind of a conventional "matching" method. The selected, best to the recorded, current temporal-local course the speed appropriate historical speed profile, d. H. The historical hydrograph is called the prediction gait used for the dynamic forecast of the traffic condition. Here, the traffic condition for the corresponding Traffic network in the vicinity of the vehicle in the direction of travel of the vehicle based on the selected forecast gait line predicts what the information about it contains how in the considered area in a prognosis period the traffic condition most likely to develop.

at the use of the speed of the vehicle as a traffic condition parameter be a predictable traffic condition in particular a possible speed of the vehicle or a traffic flow determined and displayed, with the predicted traffic conditions expediently classes K1 to K3 be assigned. Classes K1 to K3 of the possible speed are here z. B. characterized in that in a first Class K1 free movement up to a maximum reduction of possible speed is possible by 20%, in a second class K2 a reduction of the possible speed between 20% and 50% and in a third grade K3 the possible speed is reduced by more than 50%.

there can the dynamics of dense traffic to the so-called effective bottlenecks of a considered traffic route network, z. B. a road network, within a considered Territory, through the formation and behavior of the so-called patterns describe dense traffic. Such patterns seal traffic consist of the distinguishable state phases or classes such as "synchronized Traffic "," compressed synchronized traffic "and" yourself Moving wide congestion ", with which the traffic dynamics with additional consideration of the state of "free Traffic "can be adequately described.

Also are used in the determination of traffic conditions in addition to times of day, Weekdays and seasons further calendar specifics, at which special traffic conditions occur, considered. For example, depending on a current Vehicle POS POS Holidays before a weekend, holidays in the Week, Saturdays in a winter sports season with a change of occupancy in accommodation, a holiday start or major recurrent events taken into account, such kalendarische constellations Part of the historical speed profiles are or the associated with historical speed profiles in the database are.

The Speed profiles of the database of map data are preferred permanently assigned to the respective card. Alternatively or in addition the speed profiles are made by means of the communication unit updated and / or transmitted.

Of the Predicted traffic condition according to the invention to a freely selectable time and / or on a freely selectable Location as traffic overview map V displayed in vehicle, the display of the traffic overview view map V in Presettable time intervals automatically updated becomes.

The traffic overview maps V are preferably each generated from a current map representation K of the active route guidance of the navigation device, wherein additional information output in the map display K, such as, for example, information about places of interest in the traffic overview cards V are hidden and the traffic conditions the map display K are displayed overlapping. Geographic references and the existing route are also displayed when the route guidance is active, even when the map display K is overlaid with the respective traffic overview map V. Thus, in the optical output of the predicted traffic condition, the optical output of the route guidance is not affected.

In Appropriately, the traffic summary maps V always based on the current vehicle position POS and in a predetermined time interval, z. 10 or 15 minutes, generated. Always informing the user of the information displayed from the same base and thus easy to understand output, the traffic conditions in the traffic survey maps V particularly preferably always in the same time range, for example from minus 1 hour to plus 2 hours at the current time and vehicle position POS displayed in a fixed map section. For example when updating the traffic conditions after 15 minutes issued within 3 hours 12 traffic overview maps V, which of the users z. For a period of 1 minute can look at, with the respective traffic summary map V is faded in every 5 seconds.

A graphical representation of each of the classes K1 to K3 assigned Traffic conditions in the traffic overview maps V takes place in the illustrated embodiment in the way that the predicted traffic conditions or their associated Classes K1 to K3 for sections, for which historical speed profiles are known in the Traffic overview map V marked differently in color and directional depending on the possible Speed are displayed. Here is, for example, a Coloring chosen such that a green representation class K1, d. H. free traffic up to the maximum reduction the possible speed by 20%, a yellow representation class K2, d. H. the reduction of the possible speed by 20% to 50%, and a red representation of class K3, d. H. of the Reduction of the possible speed by more than 50% equivalent. These color markers will be the ones in question Route sections of the traffic route network issued covering.

Prefers the individual traffic overview maps V become in form a so-called storage radar issued and controlled, with temporal consecutive traffic overview maps V from the same map sections with a respectively updated traffic condition be formed. In other words: starting from the same map section becomes a temporal dependence a local change or extension of the traffic conditions in the map section projected and this is updated in a given time Sequence issued. Here, the displayed traffic overview maps V of the storage radar automatically at fixed times, for example issued every 5 seconds in the form of a slide show or manually controllable, whereby, in the manual control of the user, the output of the storage radar can stop at any time and in any place and the individual chronologically consecutive traffic overview maps can "browse" freely. The user can this "Stauradar" continues for everyone any location of the digital map and for any period, for example, up to a limit of 24 hours.

Further the traffic conditions become traffic overview maps V preferably not permanently, but for automatic predefined or manually predefinable periods are displayed, for example, the map representation K of the active route guidance covering for a minute with the traffic conditions is pictured.

1

display unit

K

map display

K1 to K3

class

POS

vehicle position

V

Traffic overview map

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 10051777 A1 [0003]
• DE 10057796 A1 [0004]
• - DE 10037827 A1 [0005]
• - DE 10350679 A1 [0006, 0022]
• - DE 102004006688 A1 [0008]
• - DE 10119730 A1 [0009]
• DE 10110549 A1 [0010]

Claims (7)

Method for map-based traffic forecasting for a navigation device in a vehicle, vehicle-autonomous temporally-local continuous detection of at least one Traffic condition parameter; Forecasting a traffic condition in the direction of travel of the vehicle by comparing a detected current temporal-local course of at least one Traffic condition parameters with associated stored historical hydrographs of the traffic condition parameter, marked by Display a predicted traffic condition as Traffic overview map (V) in the vehicle; automatic Updating the traffic overview map (V) in predefinable time intervals. Method according to claim 1, characterized in that that the predicted traffic condition to a freely selectable Time or at a freely selectable location as the traffic overview map (V) is displayed. Method according to claim 1 or 2, characterized that successive traffic overview maps (V) from the same map sections with current traffic status be formed. Method according to one of the preceding claims, characterized in that the traffic overview maps (V) in each case from a current map representation (K) of an active map Route guidance generates a generated navigation device are, where in the map display (K) output additional information in the traffic overview maps (V) are hidden and the traffic conditions covering the map display (K) are displayed. Method according to claim 4, characterized in that that the traffic conditions for a predefinable Period are displayed. Method according to one of the preceding claims, characterized in that at least as a traffic condition parameter a speed of the vehicle recorded temporally-locally and to generate the hydrographs continuously temporally-local is stored. Method according to one of the preceding claims, characterized in that predicted traffic conditions each classes (K1 to K3) are assigned, the classes (K1 to K3) of the predicted traffic conditions directional depending on a possible speed be displayed in different colors.