Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Traffic analysis or control of surface vehicle
Reexamination Certificate
1999-06-16
2001-05-22
Cuchlinski, Jr., William A. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Traffic analysis or control of surface vehicle
C701S119000, C701S118000, C340S991000, C340S425500, C180S167000
Reexamination Certificate
active
06236932
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a process for the completion and/or verification of data concerning the status of a traffic network.
2. Discussion of the Prior Art
A central traffic generates traffic station reports concerning the current status or a future state of the traffic network based on measurement data (in particular average speed, quantity of vehicles, volume of traffic) measured by stationary detectors at determined positions in the traffic network and/or based on measurement data, especially vehicle speeds, measured by mobile detectors (FCD). However, the measurement data available to the central traffic station do not cover areas with respect to the traffic network; measurement data measured by mobile detectors in the motor vehicles are not available where there are no motor vehicles with mobile detectors. Measurement data measured by stationary detectors are only available where stationary detectors are located and in operation and have just sent measurement data, wherein the transmission of measurement data, for example, in the case of detectors operated by solar energy, can be carried out only in relatively large time intervals. Because of incompleteness with respect to area coverage, verification with respect to errors is made more difficult and the quality of the prepared traffic reports is not optimum.
SUMMARY OF THE INVENTION
It is the object of the present invention to optimize the generation of a traffic report concerning a current status or a future state of the traffic network in a simple, economical and efficient manner.
Traffic status analysis and/or forecast in a central traffic station is optimized through the use, according to the invention, of three different types of data for completing and/or verifying. For this purpose, a repeated feedback of data is carried out for completion and/or verification of data. The type of feedback depends on the type of data that are fed back.
A cyclic feedback of progress lines or profiles, that is, compressed historic data, are advisable above all; a profile is, for example, the traffic volume curve on Mondays.
A direct feedback is important above all in interpolating or taking into account movements of vehicles in the system, wherein this model component can check after every time increment whether or not an assumption about a traffic state downstream in traffic made on the basis of sensor data is consistent with data coming in from that location.
For the purpose of feeding back status data derived from measurement data relating to the past and/or forecast data prepared in the past for completion and/or verification of measurement data, derived quantities and quantities relating to measurement data can be considered in relation to one another when the status data or forecast data concern other (especially derived) quantities of the traffic network. In addition to a completion and verification of measurement data, it is also possible, in particular, to complete and/or verify status data concerning the current status of a traffic network. In so doing, a feedback of status data relating to times in the past and forecast data calculated from times in the past can be carried out for purposes of completion and/or verification of status data concerning the current status indirectly by completing and/or verifying measurement data and/or by passing on, at least in part, status data which are fed back in a base component with measurement data and/or forecast data in a model component provided for calculation of status data. Forecasts prepared in a forecast component of the central traffic station concerning the status of a traffic network for a future time are also optimized in this way when they are carried out based on completed and/or verified measurement data and/or based on completed and/or verified status data.
For this purpose, the current status of a traffic network can be calculated from measurement data measured up to the current time and from one or more traffic states of the traffic network at times in the past. In this connection, different process components can be used alternately or in conjunction for verification and/or for further completion by using any measurement data that may be completed or verified. A flow model and/or fuzzy logic and/or interference behavior detection and/or a domain model divisional method are/is particularly advisable for determining the current status of the traffic network. Previous states and/or status data, which may possibly be completed or verified, concerning the current status and/or previously measured measurement data (which can be passed on from the model component to the forecast component similar to a multiplexer) that are completed or verified in addition or instead can be used to prepare a forecast concerning a future point in time.
For completion and/or verification, statistical data of a historic database relating to states and/or measurement data of the traffic network at times in the past are/is advisably used. For this purpose, the historic database which can be assigned to the base component in a central traffic station is constantly updated in the central traffic station with measurement data and/or status data. The historic database can contain, in particular, profile data concerning time curves of measurement data and/or states for the completion and/or verification. Profile data of this type can contain, in particular, time curves of measurement data and/or states over the course of a weekday; variations over the course of a year can be stored, if required.
A program for implementing the process according to the invention can be realized in a central traffic station.
Further features and advantages of the invention are indicated in the following description of an embodiment with reference to the drawings.
REFERENCES:
patent: 5289183 (1994-02-01), Hassett et al.
patent: 5696503 (1997-12-01), Nasburg
patent: 5812069 (1998-09-01), Albrecht et al.
patent: 5999877 (1999-12-01), Takahashi et al.
patent: 6092020 (2000-07-01), Fastenrath et al.
Cohen & Pontani, Lieberman & Pavane
Cuchlinski Jr. William A.
Hernandez Olga
Mannesmann AG
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