EP3610474A1 - Système de commande de feux de circulation et unité de commande correspondante - Google Patents

Système de commande de feux de circulation et unité de commande correspondante

Info

Publication number
EP3610474A1
EP3610474A1 EP18719682.9A EP18719682A EP3610474A1 EP 3610474 A1 EP3610474 A1 EP 3610474A1 EP 18719682 A EP18719682 A EP 18719682A EP 3610474 A1 EP3610474 A1 EP 3610474A1
Authority
EP
European Patent Office
Prior art keywords
traffic lights
traffic
cost
groups
schedule
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.)
Withdrawn
Application number
EP18719682.9A
Other languages
German (de)
English (en)
Inventor
Robbin John BLOKPOEL
Mahtab JOUEIAI
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.)
Dynniq Peek Traffic BV
Original Assignee
Dynniq Peek Traffic BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dynniq Peek Traffic BV filed Critical Dynniq Peek Traffic BV
Publication of EP3610474A1 publication Critical patent/EP3610474A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • G08G1/08—Controlling traffic signals according to detected number or speed of vehicles

Definitions

  • a system for controlling traffic lights and a corresponding control unit A system for controlling traffic lights and a corresponding control unit.
  • the present disclosure relates to a system for controlling traffic lights.
  • Systems are known for controlling traffic lights, wherein a known system comprises at least two groups of traffic lights, wherein each group comprises at least one traffic light, wherein each of said traffic lights is arranged to indicate that traffic may pass the traffic light in a first state of the traffic light and that traffic may not pass the traffic light in a second state of the traffic light.
  • An objective of the current invention is to provide a system for controlling a traffic lights schedule that allows for an increased road capacity, i.e. an increased traffic flow at the traffic lights.
  • a system for controlling traffic lights comprising:
  • each group comprises at least one traffic light, wherein said traffic lights are arranged to indicate that traffic may pass said traffic light in a first state of said traffic light and that traffic may not pass said traffic light in a second state of said traffic light;
  • control unit arranged for controlling said states of said traffic lights in said groups of traffic lights based on a traffic lights schedule, wherein said traffic lights schedule comprises actual states of said traffic lights and scheduled states for said traffic lights,
  • control unit is arranged to update said traffic lights schedule based on cost functions per group of traffic lights of said at least two groups of traffic lights, wherein at least one of said cost functions of one of said groups of traffic lights of said at least two groups of traffic lights comprises a deviation cost, wherein said deviation cost depends on a deviation between said scheduled states in a traffic lights schedule and an update of said traffic lights schedule.
  • the control unit is arranged to update said traffic lights schedule based on cost functions per group of traffic lights of said at least two groups of traffic lights.
  • the system comprises at least two cost functions that are added up to an overall cost function to update the traffic lights schedule. At least one of said cost functions comprises a deviation cost.
  • Said deviation cost depends on a deviation between said scheduled states in a traffic lights schedule and an update of said traffic lights schedule.
  • the cost function takes into account said deviation between a current traffic lights schedule and an update thereof in said cost function, thereby realising an improved predictability of said traffic lights schedule while allowing for an increased road capacity.
  • the invention is at least partly based on the insight that an improved predictability of when the traffic lights are controlled to their first state positively contributes to the road capacity. That is, sudden, for example unexpected, deviations in the traffic light schedule may lead to traffic congestion and/or traffic jams.
  • the present invention introduces the concept of deviation cost to improve the predictability of the traffic light schedule.
  • the deviation cost is a cost that needs to be addressed for a (planned) deviation in the scheduled states in a traffic lights schedule.
  • the update of the traffic lights schedule may be a continuous process or may be a discrete process.
  • the traffic lights schedule may be updated after predefined time intervals, for example time intervals of somewhere between 0, 1 s - 5s or the like.
  • said deviation cost depend on a scheduled time to the first state for a traffic light of said group of traffic lights of said at least two groups of traffic lights, and on a deviation in said scheduled time.
  • this embodiment focusses on the scheduled time to the first state, i.e. the state which indicates that traffic may pass the traffic light. It was found that the predictability of the system with respect to the scheduled time to the first state contributes more to the overall traffic flow capacity compared to the predictability of the system with respect to the scheduled time to the second state.
  • said deviation costs are higher for a lower scheduled time to the first state for said traffic light of said group of traffic lights of said at least two groups of traffic lights, thereby stabilizing the traffic lights schedule by increasing the cost for a lower scheduled time while maintaining flexibility in the traffic lights schedule for a relative long scheduled time to the first state for said traffic light of said group of traffic lights of said at least two groups of traffic lights.
  • the vehicles for example cars
  • they need to update their corresponding speed severely. They, for example, need to stop, or drastically decrease their current speed. This is not the case for the second situation.
  • the vehicles need to adjust their speed slightly to make sure that the arrival time at the corresponding traffic light changes from about 30 second to about 33 seconds.
  • the deviation cost may depend non-linearly on a deviation in said scheduled time to the first state for the traffic light of the group of traffic lights of the at least two groups of traffic lights, for example quadratic, exponential or anything alike.
  • said system further comprises a receiver for receiving an input, wherein said update of said traffic lights schedule takes into account said input.
  • said system further comprises a detector for detecting traffic at a first distance of said group of traffic lights of said at least two groups of traffic lights associated with said at least one of cost function of said cost functions, wherein said at least one cost function of said cost functions takes into account said detected traffic for updating said traffic lights schedule.
  • a detector for detecting traffic at a first distance of said group of traffic lights of said at least two groups of traffic lights associated with said at least one of cost function of said cost functions wherein said at least one cost function of said cost functions takes into account said detected traffic for updating said traffic lights schedule.
  • the detection may, for example, be provided to the system via the input.
  • said at least one cost function of said cost functions takes into account a predicted time to arrival of said traffic at said group of traffic lights of said at least two groups of traffic lights for updating said traffic lights schedule. This is advantageous for realising an improved predictability of said traffic lights schedule while allowing for an increased road capacity.
  • said predicted time to arrival takes into account an expected velocity of said detected traffic and said first distance.
  • said at least one cost function of said cost functions takes into account a calculated time difference between said predicted time to arrival of said detected traffic at said group of traffic lights of said at least two groups of traffic lights associated with said at least one of cost function of said cost functions and said scheduled time to said first state for said traffic light of said group of traffic lights of said at least two groups of traffic lights.
  • said cost function comprises at least a non-linear function of said calculated time difference and wherein said cost function of said cost functions is inversely proportionally related to said scheduled time to said first state for said traffic light of said group of traffic lights of said at least two groups of traffic lights.
  • said calculated time difference is taken into account, by said control unit, to update said time schedule and/or to propose a velocity for said detected traffic. Proposing a velocity for said detected traffic light allows said traffic to adapt its velocity to avoid the need to stop at said traffic light and thereby save fuel and reduce pollutant emissions.
  • said cost of said cost function comprises an update cost, wherein said update cost depends on a duration between updates of said traffic lights schedule for said traffic light of said group of traffic lights of said at least two groups of traffic lights, and on a deviation in said scheduled time, wherein, for a given deviation, said update costs are higher for a shorter duration between said updates of said traffic lights schedule. Including an update cost is advantageous to increase predictability of traffic lights schedule.
  • said system further comprises a further detector to detect traffic waiting at said traffic light of said group of traffic lights of said at least two groups of traffic lights, wherein said cost of said cost function takes into account an expected time to clear for clearing said traffic waiting at said traffic light.
  • a further detector is beneficial to further increase the road capacity by allowing said system to take into account said expected time to clear, thereby allowing for an increased road capacity.
  • Figure 1 is a preferred embodiment of a system according to the invention
  • Figure 2 shows deviation cost DC as a function of a deviation d in a schedule time.
  • System 1 shown in Figure 1 comprises four groups of traffic lights 3, 5, 7 and 9.
  • Each group of traffic lights 3, 5, 7 and 9 has three traffic lights 3a, 3b, 3c, 5a, 5b, 5c, 7a, 7b, 7c, 9a, 9b, 9c.
  • Traffic lights 3a, 5a, 7a and 9a have a green colour and correspond to a first state of said respective group of traffic lights 3, 5, 7 and 9 indicating that traffic may pass said respective group of traffic lights 3, 5, 7 and 9.
  • Traffic lights 3c, 5c, 7c and 9c have a red colour and correspond to a second state of said respective group of traffic lights 3, 5, 7 and 9 indicating that traffic may not pass said respective group of traffic lights 3, 5, 7 and 9.
  • Traffic lights 3b, 5b, 7b and 9b have an orange colour and correspond to a third state of said respective group of traffic lights 3, 5, 7 and 9.
  • System 1 further comprises a control unit 1 1 , a detector 13 and a further detector 15.
  • the control unit 1 1 is arranged for controlling the states of the traffic lights 3a, 3b, 3c, 5a, 5b, 5c, 7a, 7b, 7c, 9a, 9b, 9c based on a traffic lights schedule.
  • the traffic lights schedule comprises actual, current, states of the traffic lights 3a, 3b, 3c, 5a, 5b, 5c, 7a, 7b, 7c, 9a, 9b, 9c and scheduled, future, states for the traffic lights 3a, 3b, 3c, 5a, 5b, 5c, 7a, 7b, 7c, 9a, 9b, 9c.
  • the control unit 1 1 is arranged to update the traffic lights schedule based on cost functions per group of traffic lights 3, 5, 7 and 9.
  • the detector 13 is provided at a first distance d1 of a first group of traffic lights 3 for detecting traffic at the first distance d1.
  • the further detector 15 is arranged to detect traffic waiting at the first traffic light 3.
  • Detector 23 is provided at a second distance d2 of a second group of traffic lights 9 for detecting traffic at the first distance d2.
  • the second distance d2 is larger than the first distance d1 .
  • the further detector 25 is arranged to detect traffic waiting at the second traffic light 9.
  • the cost of the cost function of the first group of traffic lights 3 comprises a deviation cost DC and an update cost.
  • a deviation cost DC a deviation d between a current scheduled time to the first state of the first group of traffic lights 3 and a future, updated scheduled time to the first state of the first group of traffic lights 3 is determined.
  • the determined deviation and the current scheduled time to the first state of the first group of traffic lights 3 are used as input for the cost function of the first group of traffic lights 3.
  • the cost function of the first group of traffic lights 3 comprises an element that is a non-linear, preferably a quadratic, function of said determined deviation and inversely proportional related to the current scheduled time to the first state of the first group of traffic lights 3.
  • the cost of the cost function of the first group of traffic lights 3 comprises further an element that increases the cost of the cost function of the first group of traffic lights 3 when a duration between updates n, n+1 , n+2 of the light schedule of the first group of traffic lights 3 decreases.
  • the traffic lights schedule of the groups of traffic lights 3, 5, 7 and 9 is updated to traffic lights schedule n based on the detected vehicles 17b and 17f.
  • Vehicles 17a and 17e have not yet been detected since detectors 13 and 23 are not yet passed by said vehicles 17a and 17e.
  • Vehicles 17c and 17d already passed the group of traffic light 3.
  • the distance between vehicle 17b and the group of traffic lights 3 is larger than the distance between vehicle 17f and the group of traffic lights 9.
  • the traffic lights schedule n+1 should be such that the traffic light 3c should be switched on first.
  • traffic light 9a should be switched on to avoid vehicle 17f needs to stop at the group of traffic light 9.
  • the traffic lights schedule n could be such that the current state is maintained wherein traffic light 3a is turned on allowing vehicle 17b to pass the group of traffic lights 3 while maintaining traffic light 9c turned on indicating that vehicle 17f may not pass the group of traffic lights 9.
  • the deviation cost DC for the second group of traffic lights 9 is larger than the deviation cost for the first group of traffic lights 3 since the scheduled time to the first state of the second group of traffic lights 9 based on the detected vehicle 17f is larger than the deviation cost for the first group of traffic lights 3 based on the detected vehicle 17e since the scheduled time to the first state of the first group of traffic lights 3 is longer.
  • vehicle 17f At the same speed of vehicles 17b and 17f , vehicle 17f reaches a group of traffic lights before vehicle 17e.
  • the calculated cost from the cost functions of the group of traffic lights results in a higher cost from the cost function for the second group of traffic lights 9.
  • the update n of the traffic lights schedule having a reduced total cost will turn on traffic light 9a after turning on traffic light 3c.
  • a velocity is proposed to vehicle 17b such that when vehicle 17b arrives at the first group of traffic lights 3, vehicle 17f has passed the second group of traffic lights 9 and traffic light 3a is turned on after traffic light 9c is turned on.
  • a further update n+1 of the traffic lights schedule made after both vehicles 17a and 17e are detected is analogue to the update n in that the cost are calculated from the cost functions associated respectively with the first group of traffic lights 3 and the second group of traffic lights 9.
  • the further update n+1 incurs an update cost UC for updating the update n to the further update n+1 .
  • Maintaining traffic light 3a on incurs a lower update cost in the cost function of the first group of traffic lights 3 since no deviation is introduced when vehicle 17a, following vehicle 17b on only a short distance, can pass said first group of traffic lights 3 according the traffic lights schedule n.
  • the cost from the cost functions of traffic lights results in a lower cost thereby allowing vehicles 17a and 17b to pass the first group of traffic lights 3 before turning on traffic light 9a indication to vehicle 17e it is allowed to pass the second group of traffic lights 9. Since vehicle 17e is relative far away from the second group of traffic lights 9, the scheduled time to the first state of traffic light 9a is relatively long thereby incurring relatively low cost compared to the update cost UC and the deviation cost DC from the cost function associated with the first group of traffic lights 3.
  • a computer program may be stored/distributed on a suitable medium, such as an optical storage medium or a solid- state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems. Any reference signs in the claims should not be construed as limiting the scope thereof.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)

Abstract

L'invention concerne un système de commande de feux de signalisation, ledit système comprenant au moins deux groupes de feux de circulation, chaque groupe comprenant au moins un feu de circulation, chacun desdits feux de circulation étant agencé pour indiquer que le trafic peut passer ledit feu de circulation dans un premier état dudit feu de circulation, et que le trafic ne peut pas passer ledit feu de circulation dans un second état dudit feu de circulation ; une unité de commande, agencée pour commander lesdits états desdits feux de circulation dans lesdits groupes de feux de circulation selon un programme de feux de circulation, ledit programme de feux de circulation comprenant des états réels desdits feux de circulation et des états programmés pour lesdits feux de circulation, ladite unité de commande étant agencée pour mettre à jour ledit programme de feux de circulation selon des fonctions de coût par groupe de feux de circulation desdits deux groupes de feux de circulation, au moins une desdites fonctions de coût de l'un desdits groupes de feux de circulation desdits deux groupes de feux de circulation comprenant un coût, ledit coût dépendant d'un écart entre lesdits états programmés et une mise à jour dudit programme de feux de circulation.
EP18719682.9A 2017-04-13 2018-04-09 Système de commande de feux de circulation et unité de commande correspondante Withdrawn EP3610474A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2018711A NL2018711B1 (en) 2017-04-13 2017-04-13 A system for controlling traffic lights and a corresponding control unit.
PCT/NL2018/050215 WO2018190703A1 (fr) 2017-04-13 2018-04-09 Système de commande de feux de circulation et unité de commande correspondante

Publications (1)

Publication Number Publication Date
EP3610474A1 true EP3610474A1 (fr) 2020-02-19

Family

ID=62044934

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18719682.9A Withdrawn EP3610474A1 (fr) 2017-04-13 2018-04-09 Système de commande de feux de circulation et unité de commande correspondante

Country Status (3)

Country Link
EP (1) EP3610474A1 (fr)
NL (1) NL2018711B1 (fr)
WO (1) WO2018190703A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12361824B2 (en) 2023-07-27 2025-07-15 Itron, Inc. Control of street lights to indicate priority routes in smart cities

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920967A (en) * 1974-02-22 1975-11-18 Trw Inc Computerized traffic control apparatus

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Publication number Publication date
NL2018711B1 (en) 2018-10-24
WO2018190703A1 (fr) 2018-10-18

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