EP0944890B1 - Process for completing and/or verifying data concerning the state of a road network; traffic information centre - Google Patents

Abstract

Traffic status reports and traffic forecasts of a central traffic station are optimized by a central traffic station by a process for the completion and/or verification of data concerning the status of a traffic network in a central traffic station data of the following types are used for this purpose:measurement data measured up to the present time;status data that are calculated for at least a point in time prior to the current time concerning the status of the traffic network at this point in time; andforecast data calculated for a time in the past and concerning a future time with respect to this time in the past.

Description

The invention relates to a method for completing and / or verifying data relating to the state of a traffic network.

A traffic center generates the current state or a future state traffic reports concerning the traffic network due to stationary Detectors measured data measured at certain positions in the traffic network (in particular average speed, number of vehicles, vehicle density) and / or based on measurement data measured by mobile detectors (FCD), in particular Vehicle speeds. Those available to the traffic control center However, measurement data are not nationwide with regard to the transport network; of Measured data measured in mobile detectors in motor vehicles are not available there, where there are no vehicles with mobile detectors. Measurement data from stationary detectors are only available where there are stationary detectors in Are in operation and have just transmitted measurement data, the transmission of Measurement data, for example in the case of detectors operated with solar energy, only in relative large time intervals can take place. Because of the area coverage Incompleteness is the verification of errors difficult and the quality of the traffic reports created is less than optimal.

The object of the present invention is a simple, inexpensive, efficient optimization of the generation of a traffic report regarding a current or future state of the transport network. The task is through solved the subjects of the independent claims.

By using three different types of data according to the invention the traffic condition analysis is used to complete and / or verify and / or forecast optimized in a traffic control center. There is a multiple Feedback of data to complete and / or verify data. The The type of feedback depends on the type of data being fed back.

A cyclical feedback of characteristic lines is particularly useful condensed historical data; a traffic curve is, for example, the traffic density curve on Mondays etc.

A direct feedback is especially important when it comes to interpolation or consideration of movements of vehicles in the system of importance, these Model component after each time step can check whether one is based on data assumption made by a sensor about a traffic condition downstream in the Traffic is consistent with data arriving there.

For the feedback of status data derived from measurement data to the past Points in time and / or forecast data created at past points in time Completion and / or verification of measurement data can, if the Condition data or forecast data other (in particular derived) quantities of the Transport network concern, taking into account relationships of derived sizes and sizes related to measurement data. In addition to one Completion and verification of measurement data is also a completion and / or verification in particular of the current state of a traffic network relevant status data possible. A feedback of State data relating to past times and from previous ones Forecast data calculated at times for completion and / or verification indirectly from the status data relating to the current status Completion and / or verification of measurement data and / or by at least partial transmission of feedback fed back into a basic component with measurement data State data and / or forecast data in a for state data calculation planned model components take place. Also in a forecast component of the Traffic control center creates forecasts about the state of a traffic network a future point in time is hereby optimized if it is based on completed and / or verified measurement data and / or on the basis of completed and / or verified status data.

The current state of a traffic network can be calculated from to measured data measured at the current time and from one or more Traffic conditions of the traffic network take place at past times. Different process components can be used alternatively or side by side for verification and / or further completion under Use of the possibly completed or verified measurement data become. A flow model and / or fuzzy logic and / or is particularly expedient an interference behavior detection and / or a domain model sub-method Determination of the current state of the transport network. To create a one The forecast regarding the future point in time can be the previous status and / or the Status data relating to current status, possibly completed or verified status data and / or previously measured, additionally or instead completed or Verified measurement data (which from the model component as from a multiplexer can be passed on to the forecast component) can be used.

For completion and / or verification, states and / or are expedient Statistical data relating to the traffic network at past times Historical database data used. The historical database, which can be assigned to the basic component in a traffic control center, continuously updated in the traffic control center with measurement data and / or status data. The historical database can in particular show temporal courses of measurement data and / or Condition line data for completion and / or Verification included; Such curve data can in particular be temporal Course of measurement data and / or states in the course of a day of the week contain; fluctuations over the course of a year may also be saved his.

A program for carrying out the method according to the invention can be carried out in a Traffic center can be realized.

Fig. 1

schematisch auf einer Straße fahrende Fahrzeuge mit mobilen Detektoren, stationäre Detektoren an der Straße und eine Verkehrszentrale,

Fig. 2

als grobes Blockschaltbild einer Verkehrszentrale eingehende, rückgekoppelte, weiterverarbeitete und ausgegebene Daten und Komponenten der Verkehrszentrale.

Further features and advantages of the invention result from the following description of an exemplary embodiment with reference to the drawing. It shows:

Fig. 1

schematically vehicles traveling on a street with mobile detectors, stationary detectors on the street and a traffic control center,

Fig. 2

As a rough block diagram of a traffic control center, incoming, fed back, further processed and output data and components of the traffic control center.

1, vehicles 2, 3 are driving on a road 1 (for example, the A8 motorway) with detectors 4, 5 and vehicles 6, 7, 8 without detectors. The detectors 4, 5 in For example, vehicles determine their vehicle positions with GPS as well as theirs Speeds etc. and report them as measurement data 12 to the traffic control center 9. There are also stationary stations arranged at fixed positions in the transport network Detectors 10, 11; these 10, 11 measure, for example, the number of them passing vehicles, their speeds etc. and report as measurement data 13 to the control center 9, for example medium vehicle speeds, Speed variances, the number of vehicles per unit of time etc. The Traffic control center 9 creates the current state on the basis of measurement data 12, 13 traffic reports relating to a traffic network, such as current traffic jam reports, current travel times as well as traffic forecasts for future times, such as for example expected traffic jams etc. and sends (14) Traffic status reports and traffic forecast reports via radio, radio, Cellular phones etc. to participants.

However, measurement data 12, 13 are not nationwide with regard to the traffic network, since measurement data from mobile detectors in vehicles 2, 3 are only transmitted there, where there are vehicles and there are measurement data 13 from stationary detectors 10, 11 can only be determined where detectors are located and are in operation and just broadcast.

Fig. 2 illustrates the improvement of traffic reports according to the invention current traffic condition and / or traffic forecasts by multiple Feedback of data of different types in that shown in Fig. 2 Traffic control center 9.

The traffic control center 9 continuously receives measured data 12 (shown as input values through the data container) and measurement data 13 (represented by the data container STD) from stationary detectors at a variety of locations in the transport network.

The measurement data 12, 13 are stored in the program and database component BAS 15 the traffic control center 9 continuously in a historical database with time reference of the Measurement data 12, 13 stored. Thus BAS contains measurement data from past Points in time until shortly before the current point in time. BAS 15 can also contain measurement data 12, 13 that have just been measured and / or measurement data from the historical Database in past 15 times as a multiplexer or Database interface 15 to a model component 16 of the control center 9 or / and this upstream components 17 to 20 for the calculation of Pass on traffic conditions. The model component 16 calculates (17 to 20) current traffic conditions of the traffic network at different locations of the Transport network. Status data relating to states at past times can be stored in the model component 16 or in the base component 15 his. Status data 21 relating to the current traffic status can from the model component into the base component 15 or from the Model component via the base component 15 into the model component 16 (immediately or delayed via a historical database) for completion and / or Verification of status data and / or measurement data are fed back 30. The Feedback of measurement data is here as a cyclic feedback 30 Base component 15 shown to complete measurement data. Can also in the model component 16 of the control center 9 traffic reports 23 on the current Traffic status of the traffic network is broadcast at one or more locations (Fig. 1/24). Furthermore, in particular the status data of at least the current time, possibly also at past times and possibly from a historical data transferred or measured data (which from the Base component) are used in the Forecast component 25 of the traffic center 9 a traffic forecast for Generate traffic network for at least one future point in time (26, 27, 28) and output as traffic forecast data 29. Furthermore, become a past Time for one compared to this past time in the future Forecast data 29 created by the forecast component 25 at the time lying fed back 22 for the completion and / or verification of data. Furthermore is a forwarding of the traffic forecasts made at past times, which, for example, can relate to the current time from which Base component 15 to the model component 16 possible. So you can Forecast data 29 for completing and / or verifying measurement data and / or status data can be used at the current time. Feedback data 29 to be fed back or to be fed back can be made in the Forecast component 25 in a buffer, not shown, or in the Base component 15 can be stored in a historical database.

If status data 21 is not multiplexed via the base component 15 via one buffers shown or directly fed back into the model component 16, this can be referred to as direct feedback 31.

The feedback of forecast data and status data enables one Completion and / or verification of measurement data and / or status data, which optimizes both traffic reports 23 and traffic forecasts 29.

The generation of traffic forecasts 29 on the basis of status data 21 for current and possibly past times in model component 16 and possibly additional of measurement data at the current or past times with different procedures. In particular, they are microscopic Method 26, mesoscopic 27 or macroscopic 28 methods of creation suitable from traffic forecasts. Possibly. can also use several of the methods 26 to 28 run side by side and the forecast data obtained is completed and / or verified.

Claims (7)

1. Method for completing and/or verifying data (12, 13; 21) relating to the status of a road network (1) at a traffic control centre (9), in which data of the following types are used to complete the data recorded up until the current moment by fixed or mobile detectors:

   a) compressed historical data (15),

   b) status data (21) calculated for at least one moment prior to the current moment and relating to the status of the road network (1) at that moment, and

   c) forecast data (29) calculated at a moment in the past, and relating to a moment in the future in relation to this past moment,

   in which a model component calculates current traffic statuses of the road network at different locations in the road network,
   in which data of types a) to c) are fed back from the traffic status analysis to the measured data (12, 13), in which

   the compressed historical data (1) are fed back at regular intervals, and

   during the feedback process of status data (b) relating to moments in the past, and of forecast data (c) calculated at moments in the past, there is at least a partial passing through of status data which have been fed back into a base component with measured data, or of forecast data, into the model component provided for the calculation of status data,
   and

   the model component checks, after every time step, whether an assumption about a traffic status downstream in the traffic, made on the basis of data from a detector (sensor), is consistent with data which are coming in at that location.
2. Method as in Claim 1,
   characterised in that
   time progressions of measured data (12, 13) and/or of time variation curve data relating to statuses are saved in the historical database and are used to complete and/or verify measured data and/or status data.
3. Method as in one of the preceding Claims,
   characterised in that
   measured data relating to at least one moment in the past are verified and/or completed.
4. Method as in one of the preceding Claims,
   characterised in that
   a completion and/or verification is carried out of status data relating to the status of the road network at a moment in the past.
5. Traffic control centre (9) with a memory facility, with a program held in the memory for implementing the method as in one of the preceding Claims, with a memory for data (12, 13, 21, 29), with a processor for processing the program, and with a communication device for the entering of measured data (12, 13).
6. Traffic control centre (9) as in Claim 5,
   characterised in that
   it has a mobile telephony device for receiving measured data.
7. Traffic control centre as in Claim 5 or 6,
   characterised in that
   it has a transmitter or an interface with a transmitter for the issuing of traffic reports (23) and/or traffic forecasts (29).

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