EP0880120B1 - Méthode pour détecter et signaler des données de position de trafic - Google Patents

Méthode pour détecter et signaler des données de position de trafic Download PDF

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Publication number
EP0880120B1
EP0880120B1 EP98108043A EP98108043A EP0880120B1 EP 0880120 B1 EP0880120 B1 EP 0880120B1 EP 98108043 A EP98108043 A EP 98108043A EP 98108043 A EP98108043 A EP 98108043A EP 0880120 B1 EP0880120 B1 EP 0880120B1
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EP
European Patent Office
Prior art keywords
travel time
data
traffic
actual
anticipated
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
EP98108043A
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German (de)
English (en)
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EP0880120A3 (fr
EP0880120A2 (fr
Inventor
Gerhard Nöcker
Malte Rödiger
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Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
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Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP0880120A2 publication Critical patent/EP0880120A2/fr
Publication of EP0880120A3 publication Critical patent/EP0880120A3/fr
Application granted granted Critical
Publication of EP0880120B1 publication Critical patent/EP0880120B1/fr
Anticipated expiration legal-status Critical
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    • 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
    • G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
    • G08G1/0112—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from the vehicle, e.g. floating car data [FCD]
    • 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
    • G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications
    • G08G1/0141—Measuring and analyzing of parameters relative to traffic conditions for specific applications for traffic information dissemination

Definitions

  • the invention relates to a method for detection and Reporting traffic situation data of a road network by means of sampling vehicles, according to the method in each sampling vehicle at predeterminable times an automatic position determination is carried out and dependent on associated traffic situation data be recorded and reported.
  • traffic situation data e.g. for an automobile road network
  • infrastructure For example are the traffic situation data of measuring instruments in the form of Induction loops detected along the considered road network and relayed via signal cables to a central office where they evaluated by means of special hardware and software and in particular investigated for occurred incidents of traffic become.
  • infrastructure-based procedures are comparative consuming and also allow the detection of accidents only if their effects affect at least one Point of the road network show.
  • sampling vehicles also referred to as "floating cars”
  • sample vehicle By the name sample vehicle is intended be expressed that it is sufficient, a comparatively small proportion of all vehicles using the road network in this way for collecting the traffic situation data, i. from track-related, to assess the traffic situation in the Road network relevant data, as such sampling vehicles interpreted.
  • the message of the traffic situation data is preferably via a radio communication link, e.g. a mobile network, to a stationary center and / or others Vehicles.
  • a known difficulty of these methods is in that usually during each traffic situation reporting process transferred amount of data related to the capacity existing radio networks is relatively large, so that there are radio network overloads can come. In addition, the processing requires the large amounts of data corresponding computing effort.
  • a method of the type mentioned, proposed which reduces the amount of data to be transferred shall be that those recorded by the relevant sampling vehicle, traffic-related vehicle and position data of one or multiple vehicle and position data classes that correspond to a particular correspond to typical vehicle behavior and the assigned class as the current vehicle behavior pattern with the position data for a respective reporting process is transmitted, especially to a traffic computer. So that should be achieved that in a respective reporting process not the transfer complete data records of the vehicle and position data but only the assigned vehicle behavior pattern in the form of an identifier, which refers to the current Class affiliation, along with the positional data of the sample vehicle.
  • the vehicles are in exchange groups subdivided, where vehicles of a respective exchange group under itself vehicle data, i. Data about the environmental and / or operating condition of the vehicle, and position data, i.e. Data about the position of the respective vehicle too at any given time.
  • a selected vehicle Each exchange group transmits the reconditioned vehicles and vehicles Position data of a replacement group to a central computer, wherein the position data regularly after covering a certain distance and / or after a predetermined Time span are transmitted.
  • For the vehicle data can be provided be to specify tolerance values and this together with the To transmit positional data only if a part of them exceeds the specified tolerance values.
  • WO 95/14292 discloses a comprehensive, centralized Method of data collection, processing and storage using a lot of sampling vehicles. there be in a sample vehicle on sections of a Road network related data stored together with the road network, and a traffic data reporting process is triggered if data currently collected in the sample vehicle is a Deviation by more than a respective, specifiable threshold is detected from the stored data.
  • the invention is the provision as a technical problem a method of the type mentioned, with the Traffic situation data reliable and with comparatively To raise little effort and relatively easy different driving conditions of sampling vehicles Account can be taken.
  • the invention solves this problem by providing a Method with the features of claim 1.
  • this method becomes the considered road network in the sample vehicles together with journey time data for the sections of the road network expected travel time, e.g. as digital Data in an electronic memory.
  • journey time data for the sections of the road network expected travel time, e.g. as digital Data in an electronic memory.
  • the expected Position is starting from that from the previous one Position determination process known vehicle position thereby determines that the point of the subsequently traveled route network sub-section visited on the basis of the stored route network is, for the stored, the expected travel duration the time span until the current position determination process equivalent.
  • a traffic data reporting process then becomes at most then triggered when the actual position and / or journey time by more than one, specifiable Threshold deviates from the expected position or travel time.
  • the threshold value for the determined position or Driving time deviations not immutable, but as given a variable that is at least determined by the variance of Vehicle speed depends.
  • this procedure avoids traffic data reporting procedures, as long as the sample vehicle with a through the tolerance specified in the threshold for the individual Sections of the route network stored travel duration data emotional.
  • the stored correspond Partial journey duration data of a trouble-free traffic situation.
  • the absence of traffic situation reporting by a respective sampling vehicle is thus for any headquarters and / or for the other vehicles driving the route network an indication of a trouble-free traffic situation. That for detection of traffic jams unnecessary transferring distance-related Data from a respective sample vehicle in traffic jam-free Situations is avoided by this method Overall, the amount of data to be transferred is considerable reduced, so that the data communication easily on one usual mobile communication path, e.g. a digital one Radiotelephone network, can be done.
  • the device shown in Fig. 1 is in a respective Sample vehicle installed, with the distance-related data, i.e. Traffic situation data, without trackside infrastructure measures can be recorded and reported.
  • the device has a conventional hardware structure, the vehicle-side On-board computer 1 comprises, to which a road network memory 2, a vehicle position measuring device in the form of a GPS receiver 3 or alternatively another position determining device and a radiotelephone 4 are connected.
  • the on-board computer 1 is able in the usual way at desired times the vehicle position automatically determine.
  • the on-board computer 1 determines the vehicle position within a road network accessible by the vehicle, e.g. one Motorway network, this navigable road network in digital Form retrievable stored in the road network memory 2.
  • the Radiotelephone 4 serves as a vehicle-side communication terminal for communication of the on-board computer 1 with a not shown, stationary headquarters.
  • the communication terminal 4 e.g. a D-network telephone or a so-called Modakom unit his.
  • the road network memory includes 2 not only the data on the structure of the passable Road network including distance information between individual road signs, but also driving time data, with those of a respective section of the road network a for their driving normally, i. without traffic congestion, expected driving time is assigned.
  • the expected driving time can be determined empirically and in advance both to the existing Sampling vehicles as well as a possible stationary Central and the rest, the road network driving vehicles to provide.
  • the expected journey time does not need to be invariable for a particular leg, fixed size, but it is preferred as at least one of the time and / or the date assigned dependent variable. This can be taken into account that the expected for a particular leg route duration generally fluctuates both on a daily basis and depends on whether the trip is on a weekday or on a weekend and / or winter or summer road conditions it is to be reckoned with, which in each case appropriate effects on the average vehicle speed and thus the expected travel time has.
  • FIG. 2 is a schematic flow diagram roughly illustrating the main flow of the method of detecting and reporting traffic situation data by a respective sampling vehicle that can be performed by the apparatus of FIG. 1.
  • a time interval t p is specified, after the expiry of which a new position determination is to be carried out.
  • the position determinations carried out at predeterminable times can also be made in each case when the vehicle has reached certain road network points, for example the end point of a respective road network sub-section, which is assigned a specific, expected driving time.
  • a triggering of position determination operations may be provided by certain events, especially after a strong braking operation with subsequent actuation of the hazard warning lights as suspected jam end.
  • information about the triggering event is then transmitted in addition to the determined position.
  • an event counter having a count i which detects the number of position determinations made is initially set to zero.
  • the on-board computer 1 determines, as a function f (x i-1 , t p ) of the last measured position x i-1 and the elapsed time t p, that distance w i , starting from the last measured vehicle position x i-1 from the vehicle is to be expected during the time elapsed in the meantime t p on the basis of the stored for the relevant part of the traveled route network, expected driving time in trouble-free traffic as covered by the vehicle distance. It is understood that both the actual distance s i and the expected distance w i are not to be understood as pure distance indications, but additionally contain the information about the associated route network sub-section, which was traveled by the vehicle since the previous position determination. By way of example, the measured distances s i and the determined, expected distance w i are to be regarded as different from one another, even though they have the same distances, but relate to path network sections extending in different directions.
  • a threshold value is defined in the form of a percentage deviation amount ds i by which the actual distance s i may deviate from the determined, expected distance w i , without this leading to the triggering of a traffic situation data reporting process.
  • this deviation amount ds i is not invariable, but redefined for each positioning operation as a variable amount that depends in a predetermined manner on vehicle condition and / or vehicle environment parameters.
  • the allowable amount of deviation ds i is set as a function of the variance in the instantaneous speed of the sampled vehicle so that it can be set to a higher value than, for example, slower vehicle speed than less speed variations, unnecessarily frequent traffic-situation reporting with temporarily greater variations in vehicle speed to avoid.
  • the on-board computer 1 determines whether the percentage deviation of the difference between the actually traveled distance s i and the expected distance w i determined for the traveled section has exceeded the predetermined deviation amount ds i . If this is not the case, a message of traffic situation data is omitted and the process returns before the inquiry step 12, after which a new position determination event is awaited. If, on the other hand, the permissible, predefined deviation amount ds i is exceeded, the on-board computer 1 evaluates this as a release of a traffic position data reporting process (step 16).
  • the actual triggering of the relevant reporting process can be linked to other conditions, for example, whether the aboard computer 1 an abrupt braking operation or setting the hazard warning lights is observed, which may indicate an incipient traffic jam and therefore the automatic triggering of a traffic situation data reporting and / or whether a fuel cap or a door of the vehicle is opened, indicating a driver-initiated stop, which is not due to the traffic situation and therefore does not require the triggering of a traffic situation data reporting process.
  • a traffic data reporting process is already triggered due to the exceeding of the specified deviation amount ds i or only on satisfaction of other conditions are required by the present event discrete method less data transfer operations on the mobile communication path 5, what their respective load and the associated cost significantly compared to the aforementioned conventional approaches significantly reduced.
  • a cycle of the cycle is completed when the cycle end 17 is reached, and the process returns to the query step 12 for a new cycle, as long as no system shutdown has occurred.
  • the method shown in Figure 2 in its rough sequence can also be further refined as needed.
  • the reliability of the traffic situation message can be increased by an individually adjustable factor, which constantly compares the actual with the determined, expected driving time from the start of the journey, ie from the initialization time t 0 , taking into account systematic deviations.
  • Such deviations may, for example, be such that for a sample vehicle occupied by a sporty driver, the actual driving time tends to be shorter than the expected driving time, whereas for a more cautious driver, the actual driving time tends to be longer than the expected driving time.
  • the after triggering of a corresponding message process in the step 16 from the on-board computer 1 via the communication terminal 4 and the Mobile radio link 5 reported traffic situation data are sent to the stationary headquarters and / or directly as broadcast to all or to certain, e.g. those near the sending sample vehicle transmitted vehicles. Receiver side can. the reported traffic situation data then from the central office or the Notified vehicles evaluated in the desired manner become.
  • the evaluation may e.g. as protection against unique, accidental Failure messages include the measure that one of a certain traffic situation reporting process reported traffic disruption is only considered as such if it is within one certain, specifiable observation period by a traffic data message same content is confirmed, the a later positioning of the same or another Sampling vehicle requires.
  • the same messages from requires multiple sampling vehicles to avoid traffic jams by a single, inappropriately driven sample vehicle to avoid.

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

Claims (4)

  1. Procédé pour détecter et signaler des données de situation de circulation d'un réseau routier à l'aide d'un véhicule d'échantillonnage respectif, dans lequel
    un ou plusieurs critères de déclenchement de détermination de position sont prédéfinis, et dans le véhicule d'échantillonnage respectif une détermination de position automatique est réalisée respectivement à l'arrivée d'un critère de déclenchement, et en fonction de ceci des données de situation de circulation associées sont détectées et signalées,
    le réseau routier avec des données de durée de déplacement concernant la durée de déplacement prévisible sur des trajets partiels du réseau routier est mémorisé dans le véhicule d'échantillonnage respectif,
    après une détermination automatique respective de la position réelle (xi), le trajet partiel du réseau routier parcouru depuis la détermination de position précédente ainsi que la durée de déplacement réelle (tp) associée sont détectés, la position prévisible pour la durée de déplacement réelle (wi+xi-1) et/ou la durée de déplacement prévisible pour la position réelle étant déterminées à l'aide des données de durée de déplacement sur le trajet partiel mémorisées, et la position réelle est comparée avec la position prévisible et/ou la durée de déplacement réelle avec la durée de déplacement prévisible, et un processus de signalisation de données de situation de circulation n'est déclenché qu'au cas où la position et/ou la durée de déplacement réelles s'écartent de la position ou durée de déplacement prévisibles de plus d'une valeur seuil (dsi) respective pouvant être prédéterminée, et
    la valeur seuil (dsi) est prédéterminée sous la forme d'une variable dépendant au moins de la variance de la vitesse de véhicule momentanée.
  2. Procédé selon la revendication 1, également caractérisé en ce que la durée de déplacement prévisible mémorisée pour un trajet partiel sur le réseau routier respectif est prédéterminée sous la forme d'une variable dépendant au moins de l'heure ou de la date.
  3. Procédé selon la revendication 1 ou 2, caractérisé en outre en ce qu'une information concernant une difficulté de circulation contenue dans un message concernant la situation de la circulation n'est considérée côté récepteur comme une difficulté de circulation réelle que si pendant une durée de confirmation pouvant être prédéterminée au moins un message concernant la situation de la circulation du même contenu est reçu, notamment un message envoyé par un autre véhicule d'échantillonnage.
  4. Procédé selon l'une quelconque des revendications 1 à 3, également caractérisé en ce que côté récepteur, lorsque pendant une durée d'observation pouvant être prédéterminée des messages concernant la situation de la circulation sont reçus, qui pour un trajet partiel respectif signalent de manière conforme un écart persistant de la durée de déplacement réelle par rapport à la durée de déplacement prévisible mémorisée, la durée de déplacement réelle signalée est mémorisée en tant que nouvelle durée de déplacement prévisible pour le trajet partiel concerné.
EP98108043A 1997-05-24 1998-05-02 Méthode pour détecter et signaler des données de position de trafic Expired - Lifetime EP0880120B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19721750 1997-05-24
DE19721750A DE19721750A1 (de) 1997-05-24 1997-05-24 Verfahren zur Erfassung und Meldung von Verkehrslagedaten

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EP0880120A2 EP0880120A2 (fr) 1998-11-25
EP0880120A3 EP0880120A3 (fr) 2000-09-20
EP0880120B1 true EP0880120B1 (fr) 2004-06-30

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US (1) US6259377B1 (fr)
EP (1) EP0880120B1 (fr)
JP (1) JPH1166487A (fr)
DE (2) DE19721750A1 (fr)
ES (1) ES2221094T3 (fr)

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Also Published As

Publication number Publication date
DE19721750A1 (de) 1998-11-26
ES2221094T3 (es) 2004-12-16
US6259377B1 (en) 2001-07-10
EP0880120A3 (fr) 2000-09-20
EP0880120A2 (fr) 1998-11-25
JPH1166487A (ja) 1999-03-09
DE59811617D1 (de) 2004-08-05

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