EP2329476B1 - Verfahren zur optimierung der verkehrssteuerung an einem lichtsignalgesteuerten knoten in einem strassenverkehrsnetz - Google Patents

Verfahren zur optimierung der verkehrssteuerung an einem lichtsignalgesteuerten knoten in einem strassenverkehrsnetz Download PDF

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Publication number
EP2329476B1
EP2329476B1 EP09781111.1A EP09781111A EP2329476B1 EP 2329476 B1 EP2329476 B1 EP 2329476B1 EP 09781111 A EP09781111 A EP 09781111A EP 2329476 B1 EP2329476 B1 EP 2329476B1
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Prior art keywords
traffic
relevance
vehicle
signal
strategic
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EP09781111.1A
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German (de)
English (en)
French (fr)
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EP2329476A1 (de
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Andreas Poschinger
Martin Bunz
Jürgen Mück
Reinhold Tannert
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Siemens AG
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Siemens AG
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • 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
    • G08G1/07—Controlling traffic signals
    • G08G1/081—Plural intersections under common control

Definitions

  • the invention relates to a method for optimizing the traffic control at a traffic-signal-controlled node in a road traffic network, wherein the vehicle traffic in accesses to the node is controlled by signal groups of a traffic signal system according to associated signal times, wherein for the signal group approaching vehicles from traffic data based on a traffic model in Depending on the signal times traffic characteristics are determined, and wherein the traffic characteristics are weighted and summed to determine optimum signal times and the goal function thus formed is optimized by varying signal times.
  • a traffic signal system comprises signal generators grouped for signal groups for different traffic flows, which are designed to emit light signals to the road users.
  • a main traffic direction and a secondary traffic direction which are controlled by separate signal groups, intersect at a node.
  • the traffic signal system further comprises a control device in which a signal program runs to switch on the signal groups according to specific signal times.
  • the signal times include green times for each signal group, defined by the times green start and end green within a round trip time, as well as a phase sequence of the vehicle traffic blocking red phases and these releasing green phases.
  • the signal program is given as a frame signal plan whose phase transitions are immutable while maintaining intermediate times, but whose durations can be stretched or compressed as needed within predefinable permission areas.
  • the signal programs of adjacent nodes are coordinated to control the traffic flow through traffic lights over several nodes.
  • the green times are tuned by temporal offset of the signal programs such that, for example, the majority of vehicles can pass multiple nodes without stopping while maintaining a certain speed.
  • phase sequence selection The selection of the phase sequence, the choice of the orbital period, the distribution of green times and the assessment of offsets should be made optimally for the nodes in the road network. This applies both to the planning optimization with previously determined traffic data, as well as to methods for optimizing the traffic flow, which are based on currently measured traffic data.
  • Known optimization methods vary the phase sequence selection, the round trip time selection, the green time distribution and the offset times such that an optimum value of a target function results, which is formed as a weighted sum of traffic parameters.
  • the essay of Friedrich et al "Strategic Traffic Management - A Consistent Theory and its Implementation", published in the conference volume HEUREKA 2002, 6.-7. March 2002 , from The Road and Transportation Research Association, Cologne, describes a road traffic control system that uses an architecture that divides the entire system into three logical levels: the local, the tactical and the strategic level.
  • the adaptive control methods respond to short-term changes in traffic and to particular events, such as logging in to favor a public transport vehicle on a traffic signal, according to a predefined objective function.
  • the tactical-level adaptive control techniques use the traffic flow information collected, estimate the origin / destination relationships in the road network that is relevant to them and carry out short to medium-term traffic forecasts. Based on this and using the corresponding impact models, optimal frameworks can be defined according to a given objective function.
  • the control system and the traffic situation are monitored.
  • the invention is therefore based on the object to provide an optimization method of the type mentioned, which allows an improved implementation of predetermined traffic strategies.
  • the object is achieved by a generic optimization method with the features of the characterizing part of claim 1.
  • traffic characteristics such as the number of stops and waiting times, determined individually for each vehicle and according to their strategic relevance for the implementation of a given traffic strategy individually weighted, whereby the strategic relevance of the traffic parameters is modeled by at least one time-dependent strategy relevance profile, a differentiated assessment of the traffic characteristics, possibly fine vehicle, and thus a favoring or obstructing certain routes of the vehicles possible.
  • predefined traffic strategies such as the concentration of traffic on major traffic axes, can be implemented with significantly better quality.
  • traffic parameters can vary Depending on their current route, vehicles may have different strategic relevance.
  • traffic strategy specifications are accessible to mathematical modeling and can be explicitly taken into account by the optimization.
  • an evaluation period is subdivided into discrete time intervals and for each time interval the traffic parameters of vehicles with the same strategic relevance are summarized and weighted collectively.
  • An evaluation period can extend from the duration of a signal circulation of the signal group up to a multiplicity of signal cycles, depending on which time horizon is expedient for the simulation. This allows a separate weighting for vehicle groups of a time interval with the same strategic relevance.
  • an evaluation period is subdivided into discrete time intervals and, depending on the strategic relevance of the traffic parameters, a strategy relevance profile is modeled with which the traffic parameters of vehicles of this strategic relevance are individually weighted in this time interval.
  • the strategy relevance profiles indicate, in a time-dependent manner, the weights with which the traffic parameters of vehicles of a specific strategic relevance enter the target function in a time interval.
  • a collective strategy relevance profile is modeled, with which the traffic parameters of vehicles of all strategic relevances of each time interval are weighted together.
  • a collective strategy relevance profile indicates, in a time-dependent manner, the weights with which the traffic parameters of all vehicles enter the target function in a specific time interval.
  • the loss of vehicle refinement Weighting of the traffic parameters is offset here by the saving of calculation time for the simulation or optimization by the simplification in the modeling with a smaller number of variables.
  • the driving history of the vehicle is taken into account as the strategic relevance of the traffic parameter of a vehicle.
  • the consideration of the driving history of a vehicle makes it possible to deliberately promote or discriminate against certain routes of travel by including the fate of the vehicle on pre-grades on the completed route or their entrances in the evaluation of the traffic parameters for the destination function.
  • the origin of the vehicle from a main directional or a secondary direction access is taken into account as the strategic relevance of the traffic parameter of a vehicle.
  • the different weighting of the traffic characteristics of vehicles of different sources supports the different strategic relevance of waiting times and keeping the vehicles approaching the pre-grade on main directional and side-entry approaches. If, for example, a concentration of vehicle movements on main traffic axes is to be implemented as a traffic strategy, then the traffic parameters of the vehicles coming from a main direction access are to be weighted more heavily than those whose vehicles come from a secondary direction access.
  • the strategic relevance of the traffic parameter of a vehicle takes into account the waiting times and / or numbers of stops suffered by the vehicle on at least one preliminary node.
  • the holding and waiting times of vehicles that have been driving on a main traffic axis for a long time, or of such vehicles that have already been subjected to one or more stops on the main traffic artery were weighted more heavily than other vehicles.
  • the quality of a green wave perceived by a road user should be good - this too can be a traffic strategy to be implemented.
  • traffic characteristics of vehicles already moving on the main axis are to be heavily weighted, while infiltrators from secondary direction accesses on the main axle may also frequently hold.
  • invaders in the main direction must hold at most once before they are co-coordinated in the main directional force. In that case, the weights of the stops and waiting times of these vehicles are increased once they have had to stop.
  • the objective function is formed from two weighted partial sums, in whose one subset the traffic parameters are added separately weighted by a method according to one of claims 1 to 7 and in the other subset of the traffic parameters for all vehicles approaching a signal group be summed equal weighted. While the first partial sum calculates a system optimum for all vehicles, the second partial sum aims for a strategic optimum for a single or a selection of vehicles. By weighting the partial sums, one can specify to what extent or whether the system optimum should be taken into account as a second optimization criterion in addition to the strategic optimum.
  • the distances between each two nodes K and VK of a road network N which represent the access roads to the respective node K, are numbered by a counting index 1.
  • the node K and its Vorknoten VK lie on a main traffic axis, where vehicle traffic has to be concentrated according to a traffic strategy.
  • An evaluation period which in the case of systems in the steady state is the duration of a signal circulation [0; t U -1] of the signal groups s is subdivided into discrete time intervals t of 1 sec.
  • An intensity profile i l (t) which corresponds to the current traffic volume of the traffic flowing on the driveway 1
  • a collective strategy relevance profile k l (t) are stored, which results in a weighting of waiting times w s (t ) and holding h s (t) of vehicles approaching in the time interval t on the driveway 1 of the signal group s.
  • the collective strategy relevance profile k l (t) weights the average strategic relevance of the traffic parameters w s (t) and h s (t) of all vehicles of a time interval t in only one variable, which has the advantage of a considerable saving of computing time.
  • the collective policy relevance profile k l (t) is assigned the constant value 50 if this approach is a main direction approach with nonvanishing traffic intensity i l (t)> 0, otherwise the value 0 is assigned.
  • the values of the strategy relevance profile k l (t) for the remaining access roads 1 are determined by weighting from the values of the strategy relevance profile k v ( l) (t) for the preceding approach v (1) of the access 1.
  • access 1 has a total of V predecessor accesses.
  • tr (v (1)) means the average travel time required for the previous approach v (l).
  • a model for the steady state can be used.
  • collective strategy relevance profile k s (t) the waiting times and stops can also be weighted separately according to their respective strategic relevance with individual strategy relevance profiles.
  • the weights ⁇ s and ⁇ s are the conventional weights of the system optimum. If only a strategic optimum with regard to a traffic strategy specification is to be calculated, these can be set to 0.
  • the strategy relevance profile k s (t) is both location-dependent, ie at least at the location of the signal group s, as well as time-dependent.
  • the weights ⁇ s and ⁇ s specify how much the strategy relevance profile is to be weighted on a signal group s.
  • the term traffic strategy may include both a higher-level requirement for inner-city traffic handling, for example "green waves in main traffic directions", as well as one or more subordinate sub-goals for achieving a higher-level specification, for example “Right of way for the main direction” and "No too much impairment of the secondary direction", to be understood.
  • the strategic relevance is the implementation of the sub-goals in mathematically modelable boundary conditions understood, for example, "vehicles of the main direction should not have to keep, vehicles of the secondary direction a maximum of once".
  • a strategy relevancy profile provides a timeline of a measure that satisfies strategic relevance, such as "times overstated”.
  • the strategy relevance profile is used as a weight with which a traffic parameter is taken into account in the objective function in order to be able to calculate optimum signal times with regard to the traffic strategy.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Traffic Control Systems (AREA)
EP09781111.1A 2008-09-30 2009-07-27 Verfahren zur optimierung der verkehrssteuerung an einem lichtsignalgesteuerten knoten in einem strassenverkehrsnetz Active EP2329476B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09781111T PL2329476T3 (pl) 2008-09-30 2009-07-27 Sposób optymalizacji sterowania ruchem przy węźle sterowanym sygnałami świetlnymi w sieci ruchu drogowego

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DE102008049568A DE102008049568A1 (de) 2008-09-30 2008-09-30 Verfahren zur Optimierung der Verkehrssteuerung an einem lichtsignalgesteuerten Knoten in einem Straßenverkehrsnetz
PCT/EP2009/059647 WO2010037581A1 (de) 2008-09-30 2009-07-27 Verfahren zur optimierung der verkehrssteuerung an einem lichtsignalgesteuerten knoten in einem strassenverkehrsnetz

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EP2329476A1 EP2329476A1 (de) 2011-06-08
EP2329476B1 true EP2329476B1 (de) 2013-07-17

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US (1) US8698650B2 (da)
EP (1) EP2329476B1 (da)
CN (1) CN102165501B (da)
DE (1) DE102008049568A1 (da)
DK (1) DK2329476T3 (da)
PL (1) PL2329476T3 (da)
WO (1) WO2010037581A1 (da)

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CN106023591B (zh) * 2016-06-20 2018-05-29 北方工业大学 一种城市干线绿波控制评估方法及装置
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EP2329476A1 (de) 2011-06-08
DK2329476T3 (da) 2013-10-14
CN102165501A (zh) 2011-08-24
US20110181440A1 (en) 2011-07-28
US8698650B2 (en) 2014-04-15
WO2010037581A1 (de) 2010-04-08
CN102165501B (zh) 2015-07-15
PL2329476T3 (pl) 2013-12-31
DE102008049568A1 (de) 2010-04-08

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