DE102009059128A1 - Method for traffic condition determination in vehicle, involves determining road map location information by locating device, and getting traffic information using traffic information receiver - Google Patents

Abstract

The method involves determining road map location information by a locating device, and getting traffic information using a traffic information receiver. The travel route to a destination point is determined. The information section is provided with traffic condition information.

Description

The invention relates to a method for determining traffic conditions in a vehicle according to the preamble of claim 1.

Methods for determining traffic conditions are known. In this case, different traffic conditions, for example, according to the Kerner's 3-phase traffic theory of congested traffic with the traffic conditions synchronized traffic and moving wide traffic jam can be determined. It is known, according to this 3-phase theory of traffic according to Kerner, to recognize, classify and / or predict possible traffic patterns or the traffic conditions at effective bottlenecks, in particular from the publication BS Kerner, The Physis of Traffic, Springer, Berlin, 2004 , In the publications BS Kerner, SL Klenov, A. Hiller, Criterion for Traffic Phases in Single Vehicle Data and Empirical Test of Microscopic 3-Phase Traffic Theory, J. Phys. A: Math Gen 39, pp 2001-2020 (2006) such as BS Kerner, SL Klenov, A. Hiller, H. Rehborn, Microscopic Features of Moving Traffic Jams, Physical Review E 73, 046107 (2006) a microscopic criterion for the determination of traffic phases in dense traffic on highways is proposed and investigated on the basis of empirical measurement data. In the publication BS Kerner, A Theory of Traffic Congestion at Heavy Bottlenecks, J. Phys. A, Math. Theor. 41 (2008) 215101 (42pp) so-called megajams are described as traffic conditions. If the flow of traffic within a moving wide congestion and outside its surroundings are approaching, the formation of the Megajam traffic condition may occur, causing several large traffic jams to converge. In the German patent application 102009013175 Probabilities of state transitions and their predictions for the entire road network are described.

The DE 10 2006 045 824 A1 describes in a method for boost behavior (10-20% faster acceleration) of a hybrid vehicle by a vorvorende operating situation.

In the DE 10 2007 033 720 A1 For example, a method of improving fuel economy through estimates of the drive motors (temperature, current, voltage) is described. In the DE 101 49 905 B4 is a control system for a hybrid electric vehicle, which anticipates the power demand from speed and accelerator pedal position described. In the DE 10 2007 016 109 A1 For example, a method for estimating the system performance at two power sources (hybrid) in consideration of the driver power command is described. In the DE 198 07 291 A1 is a determination of predetermined operating modes of a hybrid drive through the respective traffic environment (city, highway, traffic jams, etc.) and a timely drive change and driving recommendation for starting an electric petrol station described.

All registrations have in common that by additional information (driver request, traffic environment, assessments of the drive, operating situation) on the configuration of the hybrid drive and the "mix" and selection between z. B. gasoline engine and electric drive is influenced.

In particular, the latter laid-open specification also describes the observance of the traffic environment, wherein in areas of lower speed in cities and / or traffic congestion preferably would be powered electrically. In the presence of a certain discharge state, it is recommended to visit an electric filling station.

A decision on the connection of the electric drive only on the basis of low speed is not sufficient for the highway traffic: in cases of complex "stop-and-go" scenarios, it would lead to frequent and not optimal switching on and off of the electric drive.

Furthermore, the prior art does not describe a predictive hybrid drive recommendation if the vehicle had a statement about the preceding traffic condition.

The DE 100 51 777 describes the patterns occurring in expressway traffic and their dynamic autonomous vehicle traffic forecast based on temporal-spatial hydrograph patterns. Currently detected traffic condition parameters are used for the best possible prognosis. The DE 100 57 796 describes a vehicle-specific traffic condition forecast using communication between the vehicles with each other without a more advanced infrastructure such as a computer center.

The object of the invention is to further detail the attention to the traffic environment and to take it more precisely in order, for. B. also exploit the forward traffic situation for preventive drive recommendation of the hybrid drive and selection.

According to the invention this object is achieved by the features specified in the characterizing part of claim 1. Advantageous developments of the invention will become apparent from the dependent claims.

The invention enables improved operation of the drive system, especially if it is a hybrid drive, because depending on the determined upcoming route profile a more appropriate operation of the engine can be set or proposed. For example, if an imminent jam distance is detected by the invention, the battery of the hybrid drive can be performed in a particularly high state of charge to support the longest possible electric drive and cheap electrical starting operations. Alternatively or additionally, clear information of the driver about the upcoming sections of the route, which could cause them to change their driving style (for example faster or slower driving or to take a break) or to consider alternative routes.

For this purpose, a location information which can be calibrated with a road map is determined by means of a locating device, traffic information is determined by means of a traffic information receiver, the travel route to a predetermined destination is determined on the basis of the location information, the road map and the traffic information, and route preview information is determined therefrom.

According to the route preview information, the route is divided into sections with individual traffic conditions, each route section is assigned a route section information. Each of these route section information contains at least traffic status information and location information about the route section. This location information is preferably the distance-wise and / or temporal removal of the start of the route from the current location as well as the length and / or duration of the route section. The route section information obtained in this way is then output, in particular, these will be fed to an evaluation unit, which controls the drive system, in particular a hybrid drive system, accordingly.

In this case, either a destination point can be entered as a destination or a "virtual destination point" can be determined on the route for a predefined look-ahead route (eg 10 km or 100 km or the route to the next junction), so that for this route Traffic status information can be determined.

In particular, the route section information can be displayed to the driver or output as driving recommendations to the driver. For example, the driver may be signaled to drive more slowly in order to minimize the journey in a traffic jam, or if the driver has chosen, for example, an ecological route option and many traffic disruptions are to be expected on the look ahead route, active driving recommendations can be displayed. The obtained link information may also be provided to passengers, e.g. B. in an infotainment system according to patent application 102008026186.

To provide the route preview information, a traffic condition detection in the vehicle according to the patent application (P811527 / DE replaced by official file number) take place. Furthermore, methods for determining traffic conditions and prognosis, a traffic pattern database or lines of traffic disruptions, knowledge of effective bottlenecks in the network, traffic reports, in particular according to the RDS / TMC protocol, (Radio Data System / Traffic Message Channel) or TPEG protocol (Transport Protocol Expert Group) or freely defined transmission protocols for traffic information, combined to provide the best possible forward-looking traffic information.

The forward-looking traffic information in the vehicle describes at any time the route ahead with state information that can be combined from all methods.

The predictive traffic information preferably includes six states at each time at each location of the look-ahead area:

Extra-urban roads / highways

• 1: free traffic
• 2: synchronized traffic
• 3: Moving wide traffic jam in traffic-regulated network nodes (inner city):
• 4: undersaturated traffic
• 5: supersaturated traffic
• 6: Undefined.

Cyclically, these predictive states are determined and provided on the vehicle data buses for applications to use this information for their particular purposes.

According to an advantageous development of the invention, in the determination of the route section information, a weighting of the available route forecast information according to quality and / or reliability and / or temporal or spatial distance from the current location information takes place. For example, in certain regions, there could be no or, conversely, very subtle lines of traffic disruption; in another case, only RDS / TMC information from the route could be present.

According to an advantageous development of the invention, the traffic information used in the determination of the route preview information is obtained via a communication device from other traffic information processing points, in particular from other vehicles. Thus, traffic information obtained via further sources of information (eg vehicle counts via video surveillance at various locations or information from other road users) can be processed via a centralized traffic database. Conversely, such traffic databases may be provided with information obtained via communication means in order to improve the information base for other road users.

The invention will be further explained with reference to the accompanying drawings. Showing:

1 FIG. 3 is a schematic block diagram illustrating the generation of predictive traffic information; FIG.

2 the division of a look-ahead route into individual route preview information blocks;

3 a drive control of a hybrid engine determined from the route look-ahead information blocks.

In 1 the method according to the invention is shown schematically. This includes a process step 12 the determination of a location information which can be calibrated with a road map by means of a location device, furthermore the determination of the travel route to a destination point on the basis of the location information, the road map and the traffic information.

In the process step 14 a traffic condition determination according to patent application 102008003039 and / or according to patent application 102009032730. is applied.

In the process step 16 is the method for automatic traffic monitoring with dynamic analysis according to patent application DE 196 47 127 or DE 199 40 957 carried out.

In the process step 18 Traffic prognosis information on the basis of temporal-spatial hydrographs of traffic disruptions, in particular according to the patent application DE 100 51 777 , provided.

In the process step 20 become traffic knowledge of the road network, in particular according to the patent application DE 196 47 127 or the patent application DE 100 51 777 , provided.

In the process step 22 Traffic information is received and provided by means of a traffic information receiver, in particular according to the RDS / TMC protocol (or other transmission protocols).

In the process step 30 become from the above process steps 12 - 22 processed information, in particular the route divided into sections with individual traffic conditions and each route section is assigned a route section information, each route section information includes a traffic condition information and location information determined over the route section. This is preferably the distance-wise and / or temporal removal of the start of the section from the current location as well as the length and / or duration of the route section.

In the process step 32 the route section information is output, either to a drive controller, in particular a hybrid motor, and / or to the driver.

In 2 is shown that the monitored route 50 is divided into a number of sections 52 , whose beginning and length are spatially and in particular also temporally fixed. Every section of track 52 is associated with a link information that in 2 indicated by different labeling. Preferably, the classification occurs in the following illustrated traffic conditions: free traffic, synchronized traffic, moving wide congestion, undersaturated traffic, supersaturated traffic, undefined. All sections 52 result in a track sequence 54 ,

In 3 is a preferred application of the segment sequence 54 shown in a simple embodiment for driving control of a hybrid engine. The instruction sequence 56 to the drive control comprises in this simple example the two commands V for drive by internal combustion engine and E for drive by electric motor. This means, preferably, every section of the route 52 assigned an instruction V or E, which is either fed directly to the drive control or the driver optically and / or acoustically displayed as a recommendation.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102009013175 [0002]
• DE 102006045824 A1 [0003]
• DE 102007033720 A1 [0004]
• DE 10149905 B4 [0004]
• DE 102007016109 A1 [0004]
• DE 19807291 A1 [0004]
• DE 10051777 [0009, 0030, 0031]
• DE 10057796 [0009]
• DE 19647127 [0029, 0031]
• DE 19940957 [0029]

Cited non-patent literature

• BS Kerner, The Physis of Traffic, Springer, Berlin, 2004 [0002]
• BS Kerner, SL Klenov, A. Hiller, Criterion for Traffic Phases in Single Vehicle Data and Empirical Test of Microscopic 3-Phase Traffic Theory, J. Phys. A: Math Gen 39, pp 2001-2020 (2006) [0002]
• BS Kerner, SL Klenov, A. Hiller, H. Rehborn, Microscopic Features of Moving Traffic Jams, Physical Review E 73, 046107 (2006) [0002]
• BS Kerner, A Theory of Traffic Congestion at Heavy Bottlenecks, J. Phys. A, Math. Theor. 41 (2008) 215101 (42 pp) [0002]

Claims (10)

Method for determining the traffic condition in a vehicle, comprising the following steps: determining a location information which can be calibrated with a road map by means of a location device ( 12 ); Determining traffic information by means of a traffic information receiver ( 12 ); Determining the route to a destination based on the location information, the road map and the traffic information ( 12 ); Cyclically providing route preview information ( 30 ) Based on the location information, the road map, the traffic information and the route; characterized in that - the travel route is divided into route sections on the basis of the route forecast information ( 52 ) with individual traffic conditions and each route section, a route section information is assigned, wherein each route section information - contains traffic condition information, - location information about the route section; - the route section information is output ( 32 ). A method according to claim 1, characterized in that the route section information is displayed to the driver and / or driving recommendations are output to the driver ( 32 ). A method according to claim 1, characterized in that the link information is supplied to an evaluation unit which drives the drive system, in particular a hybrid drive system, according to the link information ( 32 ). A method according to claim 1, characterized in that in the determination of the route section information, a weighting of the available route preview information on quality and / or reliability and / or temporal or spatial distance from the current location information. Method according to one of the preceding claims, characterized in that the method for determining the traffic condition according to patent application 102008003039 and / or according to patent application 102009032730 is used in the determination of the route preview information. Method according to one of the preceding claims, characterized in that in the determination of the route preview information, the method for dynamic forecasting of the traffic condition after patent application DE 100 51 777 and / or the method for automatic traffic monitoring with dynamic analysis after patent application DE 196 47 127 is applied. Method according to one of the preceding claims, characterized in that in the determination of the route preview information information stored for distance-related speeds and their distribution over time and for spatiotemporal traffic patterns, in particular according to the German patent application DE 100 57 796 , be taken into account. Method according to one of the preceding claims, characterized in that the traffic information used in the determination of the route forward information (RDS / TMC messages and / or TPEG traffic reports and / or freely defined traffic information protocols), in particular those that are received via receiving devices. Method according to one of the preceding claims, characterized in that the traffic information used in the determination of the route preview information is obtained via a communication device from other traffic information processing stations, in particular from other vehicles. Method according to one of the preceding claims, characterized in that the link information is transmitted via a communication device to other users, in particular a central traffic information processing station or other motor vehicles.

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