EP0879460B1 - Procede et dispositif pour l'obtention de donnees relatives a une situation de trafic - Google Patents

Procede et dispositif pour l'obtention de donnees relatives a une situation de trafic Download PDF

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Publication number
EP0879460B1
EP0879460B1 EP97914127A EP97914127A EP0879460B1 EP 0879460 B1 EP0879460 B1 EP 0879460B1 EP 97914127 A EP97914127 A EP 97914127A EP 97914127 A EP97914127 A EP 97914127A EP 0879460 B1 EP0879460 B1 EP 0879460B1
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European Patent Office
Prior art keywords
traffic
speed
vehicle
traffic situation
data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97914127A
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German (de)
English (en)
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EP0879460A1 (fr
Inventor
Ulrich Fastenrath
Markus Becker
Rainer Ogger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
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Mannesmann AG
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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096708—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control
    • G08G1/096716—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control where the received information does not generate an automatic action on the vehicle control
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096733—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place
    • G08G1/096758—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place where no selection takes place on the transmitted or the received information
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096775—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a central station
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096791—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is another vehicle

Definitions

  • the invention relates to a method for acquiring data about the traffic situation in a road network, with a central office of a plurality of vehicles operating on Participate in road traffic and are equipped with a sensor system for detection traffic-relevant sensor data, which at least one the current speed v (t) size of the respective vehicle include, at time intervals Individual messages about the one arranged in the respective vehicle Data processing device recognized current on the basis of the detected sensor data Traffic situation in the vehicle environment can be transmitted wirelessly.
  • the invention further relates to a device in a vehicle for detection and submission of such individual reports. Such a method is known from the DE 4 105 584 known.
  • the recording and description of the traffic situation is an essential task in the Area of traffic telematics, the aims of which include road users to provide the most up-to-date and meaningful information possible so that the Avoid traffic congestion situations if possible and in the If necessary, switch to less congested roads.
  • stationary detection devices installed on the street (e.g. Beacons, induction loops or similar). This is not just very high Costs associated with creating and maintaining the necessary infrastructure, but also has the disadvantage that these facilities only due to the system have an extremely narrow local area of application. For one Comprehensive traffic situation detection is therefore the installation of a huge one Number of detection devices necessary.
  • a traffic situation assessment without making permanently installed street-side facilities by using the Vehicles in a sample vehicle fleet suitable collection points (e.g. traffic control center). It deals it is about measuring stations that are floating in traffic ("floating cars") relevant data (especially vehicle speed) via a mobile wireless communication device (e.g. a radio telephone) to the respective Transfer data collection point for further processing and evaluation.
  • the evaluation can then be carried out by a large number of road users in the sense of Traffic information and avoidance recommendations are transmitted so that the Depending on the traffic situation, a favorable decision on the road users can choose the chosen route.
  • the results can also be used in automatic route planning and route guidance systems.
  • a problem with the "floating cars" is that a continuous transmission of the current speed of a variety of vehicles an extraordinarily strong Load on the transmission channels of the communication device used represents and also a significant cost factor when using a fee-based communication system. Therefore one tries to replace the Transmission of individual measured values to the compressed data if possible Central to transmit, in which the traffic information collected and for the End users are prepared. For example, you could at intervals the average speed of the respective vehicle to the control center to transfer. But this is still very expensive.
  • a decision could be made about whether the data is more or less important for the traffic situation, and data transfer may only be limited to meaningful data. In this regard, it would be of great interest to focus on, for example Transmission of information about a traffic jam could restrict.
  • a traffic situation detection system based on "floating cars” in which automatically large amounts of reports from the point of view of the individual "floating cars” generated unusual and therefore significant events these reports are first subjected to a thorough check before they are used in traffic services, such as route planning, Route guidance of vehicles, traffic planning or traffic forecasts
  • traffic services such as route planning, Route guidance of vehicles, traffic planning or traffic forecasts
  • sensor technology is used for the mechanical evaluation of sensed sensor data inevitably confuse different types of events.
  • a particularly drastic example is the confusion between the "traffic jam” event and the Event "Stop at a rest area" during a motorway trip. In both cases the vehicle speed is detected by the sensors.
  • the object of the invention is therefore to provide a generic method to further develop that an at least largely automated control of Event reports can take place in the headquarters with sufficient reliability. Furthermore, a device in a vehicle is to be proposed, which for Collection and transmission of traffic situation data within the framework of a method according to the invention can be used.
  • the invention is based on a device that has a sensor system for recording data, which includes data (speed variables) representative of at least the current vehicle speed, and a data processing device that is connected to this sensor system is. Furthermore, this device comprises a communication device for the wireless transmission of individual messages, which are characteristic of the current traffic situation in the vehicle environment, to a central office.
  • the programming of the data processing device is set up in the following manner: On the basis of the detected speed variables, the data processing device carries out a classifying interpretation of the traffic situation in the vehicle surroundings, this interpretation comprising at least the class "traffic-related disruption" (traffic jam).
  • the data processing device also forms a confidence factor F on the basis of the detected speed variables, which represents a measure of the ripple of the temporal profile of the speed variables for the period to which the individual message relates, that is to say in particular for the time interval for driving through a traffic jam.
  • the data processing device compiles the individual messages to be transmitted to the control center via the communication device in such a way that they each include at least the classifying interpretation of the traffic situation in the vehicle environment and the confidence factor F.
  • the diagram of a traffic situation detection system shown in FIG. 1 is divided in function blocks belonging to a control center for recording the traffic situation data and in function blocks that are assigned to the individual "floating cars".
  • the starting point is the acquisition of sensor data using appropriate sensors in the respective "floating car”.
  • the connected to the sensors Data processing device of the "floating car” determines from these sensor data that preferably consist in the current speed of the respective vehicle, a confidence factor F, preferably according to the formula described above.
  • the values required for the reference speed v min and, if appropriate, the length of the measuring interval and the measuring frequency f can vary from the Data processing device of the "floating car" can be taken from a memory which is referred to in FIG. 1 as "default configuration". Via a transmitter / receiver (communication) for wireless data exchange with the control center, the default settings can be changed if necessary.
  • the data processing device of the "floating car” makes a classifying interpretation of the traffic situation in the vehicle surroundings on the basis of the speed variables detected by the sensors and determines the confidence factor F for this purpose.
  • the interpretation of the traffic situation, in particular the class "traffic-related disruption" Traffic jam messages are transmitted to the head office as individual messages together with the confidence factor determined via the "Communication" function block.
  • the transmitter / receiver of the control center which is also symbolized by a "Communication" function block, records the individual messages transmitted and saves them. If required, a data record for a change in the preset values in the "floating cars" can be taken from the function block of the central station designated with "preset configuration".
  • the data processing device which is not shown in more detail in the head office, checks each individual message received on the basis of the associated confidence factor transmitted in each case, as to whether the interpretation of the traffic situation made by the "floating car" was probably correct or whether it appears doubtful.
  • the vehicle speed zero can occur not only in the case of a traffic jam caused by high traffic volume, but also in the case of a scheduled stop at a rest stop or in a parking lot of a freeway.
  • a congestion caused by a high volume of vehicles usually announces itself through characteristic fluctuations in the speed profile.
  • a scheduled stop in a parking lot or at a rest area usually has a relatively smooth speed profile immediately before this stop. But it can also happen that there is a sudden traffic jam due to an accident followed by a full blockage of the road, whereby a relatively smooth speed profile is also present until the traffic jam is reached.
  • the method of the present invention would determine a comparatively large confidence factor F (near the maximum value 1) in the case of traffic-related traffic jams, the comparatively low confidence factor F would result in the cases of a scheduled stop at a rest stop or a sudden accident stop mentioned in the example
  • a large number of the individual messages arriving at the control center is therefore provided for the data processing device of the control center to automatically evaluate the individual reports based on the trust factor, with all individual reports whose trust factor is above a threshold value of, for example, 0.4 being accepted as correctly interpreted (automatic Evaluation), while all individual reports that have a lower confidence factor are fed to a traffic editor for manual evaluation.
  • the traffic information that can be made available to the road users is then formed from the two partial flows of the automatically evaluated individual reports, which are revised or finally evaluated by a traffic editor.
  • the present invention enables a high reliability of the meaningfulness of Traffic information.
  • a largely automatic evaluation of the recorded individual information instead. Only for a much smaller part of the individual reports must be evaluated manually reliable input data for the traffic information to be derived guarantee. In this way, the profitability of a high quality Data acquisition ensured.
  • Fig. 2 the effectiveness of the method according to the invention is schematic, i.e. not shown to scale using frequency distributions.
  • the trust factor of which according to the above was calculated the frequency distributions were determined p (F) plotted as a function of the confidence factor F, with curve a those individual messages were evaluated in which the automatic The "traffic jam" rating was actually correct.
  • curve b shows the frequency distribution for those individual reports that due to the automatic evaluation in the "floating cars" not applicable as a traffic jam message have been interpreted.
  • congestion single messages with an extraordinarily high confidence factor of about 0.4 or greater Have reliability because very few single messages with higher Confidence factor F can be incorrectly classified in this category.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Traffic Control Systems (AREA)

Claims (6)

  1. Procédé pour l'obtention de données relatives à une situation de trafic dans un réseau routier, des messages individuels sur la situation de trafic actuelle, reconnue en référence à des données détectées provenant de capteurs par un dispositif de traitement de données agencé dans le véhicule respectif étant transmis, dans l'environnement du véhicule, par des moyens sans fil à une centrale par une pluralité de véhicules, qui prennent part à la circulation routière et sont équipés de capteurs pour détecter des données concernant la circulation, qui comportent au moins une grandeur représentant la vitesse actuelle v(t) du véhicule respectif, à des intervalles de temps,
    caractérisé en ce que les messages individuels comportent, comme partie constitutive, à chaque fois, à côté d'une interprétation de la situation de trafic, servant de classification, effectuée en référence aux valeurs de vitesse détectées par le dispositif de traitement de données, laquelle comporte au moins la classe « perturbation liée à la circulation », également un facteur de fiabilité F qui représente une mesure de l'ondulation du profil temporel des valeurs de vitesse, en particulier de la vitesse du véhicule v(t) pour la durée à laquelle se rapporte, à chaque fois, le message individuel.
  2. Procédé selon la revendication 1,
    caractérisé en ce que le facteur de fiabilité F est formé en ce que la longueur approchée du graphe v(t), sur la durée à laquelle se rapporte le message individuel, est calculée, et la longueur du graphe v(t) est ensuite normée à l'aide d'une vitesse de référence prédéfinie et de la fréquence de mesure f utilisée lors de la détection des données de capteur.
  3. Procédé selon la revendication 2,
    caractérisé en ce que, comme vitesse de référence, on utilise une vitesse de véhicule minimale prédéfinie Vmin, qui sert simultanément comme valeur de seuil pour reconnaítre une perturbation liée à la circulation.
  4. Procédé selon la revendication 2 ou 3,
    caractérisé en ce que la vitesse de référence est modifiée au besoin par la centrale et est transmise, par des moyens sans fil, aux véhicules.
  5. Procédé selon la revendication 3 ou 4,
    caractérisé en ce que le facteur de fiabilité F est déterminé par la formule suivante :
    Figure 00150001
    dans laquelle :
    S est l'indice des mesures de vitesse au cours de la détection des données de capteur, en particulier l'indice associé à une perturbation,
    N est le nombre cardinal de cet indice,
    et ti sont les temps auxquels ont été réalisées des mesures de vitesse.
  6. Dispositif dans un véhicule pour détecter et transmettre des données relatives à une situation de trafic, comportant :
    des capteurs pour détecter des données, qui fournissent au moins des données représentatives de la vitesse actuelle des véhicules,
    un dispositif de traitement de données qui est raccordé aux capteurs, et
    un dispositif de communication pour la transmission sans fil de messages individuels, qui sont caractéristiques de la situation de trafic actuelle dans l'environnement des véhicules, à une centrale,
    caractérisé en ce que le dispositif de traitement de données présente une programmation, qui :
    fournit, en référence aux valeurs de vitesse détectées, une interprétation de classification de la situation de trafic dans l'environnement des véhicules, qui comporte au moins la classe « perturbation liée à la circulation »,
    détermine, en référence aux valeurs de vitesse détectées, un facteur de fiabilité F qui représente une mesure de l'ondulation du profil temporel des valeurs de vitesse pour la durée à laquelle se rapporte, à chaque fois, le message individuel, et
    prévoit que les messages individuels transmis par l'intermédiaire du dispositif de commutation comportent au moins, à chaque fois, l'interprétation de classification et le facteur de fiabilité F.
EP97914127A 1996-02-08 1997-01-29 Procede et dispositif pour l'obtention de donnees relatives a une situation de trafic Expired - Lifetime EP0879460B1 (fr)

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Application Number Priority Date Filing Date Title
DE19606301 1996-02-08
DE19606301 1996-02-08
PCT/DE1997/000229 WO1997029471A1 (fr) 1996-02-08 1997-01-29 Procede et dispositif pour l'obtention de donnees relatives a une situation de trafic

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EP0879460A1 EP0879460A1 (fr) 1998-11-25
EP0879460B1 true EP0879460B1 (fr) 1999-12-22

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US (1) US6092020A (fr)
EP (1) EP0879460B1 (fr)
JP (1) JP2000504860A (fr)
AT (1) ATE188059T1 (fr)
DE (1) DE59700887D1 (fr)
WO (1) WO1997029471A1 (fr)

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US5539645A (en) * 1993-11-19 1996-07-23 Philips Electronics North America Corporation Traffic monitoring system with reduced communications requirements
EP0715288B1 (fr) * 1994-11-28 1999-05-12 MANNESMANN Aktiengesellschaft Méthode et dispositif pour réduire la quantité de données qui doit être transmise par véhicules d'une flotte de véhicules témoins
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9552725B2 (en) 2000-08-28 2017-01-24 Inrix Global Services Limited Method and system for modeling and processing vehicular traffic data and information and applying thereof
US8818380B2 (en) 2004-07-09 2014-08-26 Israel Feldman System and method for geographically locating a cellular phone

Also Published As

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ATE188059T1 (de) 2000-01-15
US6092020A (en) 2000-07-18
EP0879460A1 (fr) 1998-11-25
WO1997029471A1 (fr) 1997-08-14
JP2000504860A (ja) 2000-04-18
DE59700887D1 (de) 2000-01-27

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