Classifications

• • 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
• • 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
  • G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors
• • 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
  • G08G1/052—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed

Definitions

• the present invention relates to the field of traffic monitoring systems of vehicles on routes, for example in order to deliver signals on the traffic status and / or for the regulation of traffic for example by the activation of traffic lights. of circulation.
• Known surveillance systems include a management unit and detection devices equipped with sensors, generally Doppler effect, placed at height, connected to the power plant by electrical wires so that the installation of such systems is expensive. , that the maintenance is expensive in particular because the interventions on such detection devices placed at height are carried out using pods.
• Document US 2006/0033642 discloses a system for monitoring vehicle traffic on a route, in which an electric power consumption manager generates the frequency and the duration of activation of a sensor for measuring the speeds of the vehicles and n activates electronic circuits for analyzing the signals coming from the sensor only if this sensor is activated.
• the present invention proposes an improvement and simplification of the monitoring of vehicle traffic on routes.
• a method of operating a vehicle traffic monitoring system on a path comprising a central unit provided with a radio signal transmission / reception circuit and at least one autonomous detection device comprising a sensor capable of providing signals relating to the detected vehicles traveling on said path and a radio signal transmitting / receiving circuit.
• This process can include: operate the sensor according to scanning phases separated by pause phases,
• each sensor pause phase and / or the duration of each sensor polling phase setting the duration of each sensor pause phase and / or the duration of each sensor polling phase, according to at least one traffic condition criterion or at least one criterion taken from a plurality of traffic status criteria corresponding to at least one signal from the sensor during at least one prior scan phase, and generating each transmit / receive phase of the transmit / receive circuit of the autonomous detection device according to at least one criterion of traffic state or at least one of a plurality of traffic condition criteria corresponding to at least one signal from the sensor during at least one prior scan phase and such that the transmit / receive phase is synchronized with the first phase or communication window enabled by the plant.
• the method may comprise: setting the duration of each sensor pause phase according to at least one traffic status criterion corresponding to at least one signal from the sensor during the previous scanning phase and developing or generating a phase transmission / reception of the transmission / reception circuit in case of a change of state of at least one traffic status criterion corresponding to at least one signal coming from the sensor during a previous scanning phase.
• a criterion for setting the duration of the sensor pause phase may include the flow of vehicles on the route.
• a criterion for preparing a transmission / reception phase of the transmission / reception circuit may include: the passage or the absence passing at least one vehicle on the course, and / or the passage of at least one vehicle on the course at a speed lower or higher than a first threshold, and / or the passage of at least one vehicle on the traveling at a speed greater than a second threshold greater than said first threshold.
• the method may comprise: detecting during each scanning phase the flow of vehicles traveling on said course and set the duration of the next pause phase according to this flow.
• the method may include: limiting the duration of the pause phase to a predetermined value in the case where the rate is zero or less than a predetermined value.
• the method may comprise: detecting during each scanning phase the speed of at least one vehicle traveling on said course and developing a transmission / reception phase of the transmission / reception circuit in the event that this speed passes at least a predetermined threshold with respect to the speed of at least one vehicle having traveled on said path during an earlier scanning phase.
• the method may comprise: furthermore developing transmission / reception phases of the transmission / reception circuit according to a predetermined periodicity independent of said speed.
• Setting information may be transmitted by the control unit to the detection device via said transmitting / receiving circuits.
• This monitoring system may comprise at least one autonomous detection device, a sensor capable of delivering signals relating to the detected vehicles traveling on said path, a radio signal transmission / reception circuit, and an electronic circuit for signal management. from the sensor, able to generate traffic status criteria corresponding to the signals from the sensor, and for the activation of the sensor according to polling phases separated by pause phases according to at least one criterion of state traffic and activation of the transmitting / receiving circuit according to transmission / reception phases separated by pause phases.
• the monitoring system may further comprise a central unit comprising a radio signal transmission / reception circuit able to exchange signals with the transmission / reception circuit of the detection device.
• the transmission / reception circuit of the control unit can generate communication phases or windows established at a predetermined periodicity and dedicated to the autonomous detection device, and, each transmission / reception phase of the circuit transmission / reception of the autonomous detection device can be generated according to at least one traffic status criterion and being synchronized with a phase or communication window of the central station.
• a method of operating a vehicle traffic monitoring system on a path comprising a central unit provided with a radio signal transmission / reception circuit and at least one autonomous detection device comprising a sensor capable of delivering signals relating to the detected vehicles traveling on said path and a radio signal transmission / reception circuit.
• At least one setting parameter can be transmitted to the autonomous detection device by the control unit via said transmission / reception circuits.
• a system for monitoring the traffic of vehicles on a route comprising a central unit provided with a radio signal transmission / reception circuit and at least one autonomous detection device comprising a sensor able to deliver signals relating to the detected vehicles. traveling on said path and a circuit for transmitting / receiving radio signals.
• the autonomous detection device may furthermore comprise an electronic circuit for managing the signals from the sensor, capable of generating traffic state criteria corresponding to the signals. from the sensor and for the management of signals to be transmitted via its transmission / reception circuit.
• the central unit may furthermore comprise an electronic circuit for managing adjustment parameters to be transmitted via its transmission / reception circuit.
• a system for monitoring vehicle traffic on a route comprising a central unit and at least one detection device, will now be described by way of nonlimiting example and illustrated by the drawing in which:
• FIG. 1 represents an impentance of the system at an intersection of roadways
• FIG. 2 represents an electronic diagram of the system
• FIG. 3 represents a phase diagram of operation of a sensor of the detection device
• FIG. 4 represents a diagram of operating phases of a transmission / reception circuit of the power station
• FIG. 5 represents an operating phase diagram of a transmission / reception circuit of the detection device.
• Figure 1 is shown an intersection ⁇ , for example the two roads, which is equipped with a system 1 for monitoring the traffic of vehicles.
• This monitoring system 1 comprises a central unit 2 disposed for example in a cabinet placed on the ground in the vicinity of the intersection ⁇ _ and an autonomous detection device 3 arranged in a housing placed at a height and carried for example by a pole 4, this autonomous detection device 3 being dedicated to a circulation path P of vehicles.
• the monitoring system 1 may further comprise other autonomous detection devices 3 dedicated to other traffic lanes Pa.
• the central unit 2 comprises an electronic signal management circuit 5, for example a microcontroller, and a radio signal transmission / reception circuit 6.
• the autonomous detection device 3 comprises a sensor 7, for example with a Doppler effect, oriented towards the path P to be monitored by vehicles, a radio signal transmission / reception circuit.
• an electronic signal management circuit 9 for example a microcontroller, and an autonomous source of electrical energy 1 0, for example a battery and / or a solar collector for the supply of electrical energy to the sensor 7, the radio signal transmission / reception circuit 8 and the electronic control circuit 9.
• the sensor 7 is capable of delivering to the electronic management circuit 9 signals relating to the state of the traffic on the path P.
• the transmission / reception circuit 8 is able to deliver signals to the electronic management circuit 9, originating from radio signals coming from the transmission / reception circuit 6 of the central unit 2, and is capable of transmitting signals in the direction of the transmission / reception circuit 6 of the central unit 2, originating from the electronic management circuit 9.
• the electronic management circuit 9 of the autonomous detection device 3 is programmed to operate the sensor 7 according to the scanning phases 11 separated by pause phases 12.
• the electronic management circuit 9 activates the electrical energy supply of the sensor 7.
• the sensor 7 acquires states of the traffic of vehicles traveling on the path P and transmits the corresponding signals to the electronic management circuit
• the electronic management circuit 9 Based on these signals, the electronic management circuit 9 generates or develops traffic status criteria.
• the electronic management circuit 9 at least partially deactivates the power supply of the sensor 7, reducing or avoiding the consumption of electrical energy during these pause phases.
• the electronic management circuit 9 can be programmed to place in the open state, during the pause phases, a switch placed on the connection connecting the source of electrical energy 10 to the sensor 7.
• the electronic management circuit 9 of the autonomous detection device 3 is programmed so as to set the duration of each pause phase 12 of the sensor 7 as a function of at least one traffic condition criterion corresponding to at least one signal coming from the sensor 7 during the previous scan phase 1 1, that is to say the change of state of at least one traffic status criterion.
• the chosen state criterion may be the value of the vehicle flow on the path P, compared to the value of a programmed predetermined flow threshold.
• the signal delivered by the sensor 7 to the electronic management circuit 9 contains the number of vehicles detected on the path P during a scanning phase 11.
• the electronic management circuit 9 is programmed to determine the vehicle flow rate corresponding to this scanning phase and compares this measured flow rate with the predetermined predetermined flow rate threshold, to set the duration of the next pause phase 12 to a first predetermined value programmed if the measured flow rate is greater than the predetermined flow rate threshold, corresponding to a "normal" flow rate, or to set the duration of each subsequent pause phase 12 to a second programmed predetermined value if the measured flow rate is greater than the predetermined flow rate threshold , corresponding to a "low" bit rate and so on.
• the electronic management circuit 9 of the autonomous detection device 3 is moreover programmed so that when the flow rate measured during a scanning phase 12 is equal to zero, that is to say when no vehicle is traveling on the path P , the duration of the next pause phase 12 is equal to a predetermined predetermined value.
• the duration of the scanning phases 11 may be variable depending on the signals picked up by the sensor 7.
• the electronic management circuit 9 of the autonomous detection device 3 can be programmed to stop the scanning phase 1 in progress as soon as at least one traffic condition criterion chosen is developed.
• the electronic management circuit 5 of the central unit 2 is programmed so as to develop communication phases or windows 13 established at a predetermined periodicity and dedicated to the autonomous detection device 3 during which signal exchanges occur. between their transmission / reception circuits are possible.
• the electronic management circuit 5 of the central unit 2 is programmed in such a way that the time spaces 14 separating the communication phases or windows 13 can be dedicated to the other detection devices 3a of the monitoring system 1, the time spaces 14 being subdivided accordingly.
• the electronic management circuit 9 of the autonomous detection device 3 is programmed to operate the transmission / reception circuit 8 in transmission / reception phases 15 separated by pause phases. .
• the transmission / reception circuit 8 consumes electrical energy, whereas during its pause phases, that is to say when it is in an unfit state when transmitting or receiving, its consumption of electrical energy is reduced.
• the electronic management circuit 8 can be programmed to place in the open state, during the pause phases 16, a switch provided on the connection connecting the source of electrical energy 10 to the transmission circuit. The existence of the pause phases 16 between the transmission / reception phases 15 makes it possible to reduce or avoid the consumption of electrical energy.
• the electronic management circuit 9 of the autonomous detection device 3 is programmed so as to develop a transmission / reception phase 15 as a function of at least one traffic condition criterion corresponding to at least one signal coming from the sensor 7 during of the previous scanning phase 1 1, that is to say the change of state of at least one traffic condition criterion, more particularly only in case of change of at least one state criterion.
• the chosen state criterion may be the speed of the vehicles on the path P, compared to at least one value of a programmed predetermined speed threshold.
• the electronic management circuit 9 of the autonomous detection device 3 may, for example, be programmed so as to develop a state criterion, determined from the signals received from the sensor 7 during the previous scanning phases 11, which may be: passage or absence of passage of at least one vehicle on the path P, and / or the passage of at least one vehicle on the path P at a speed lower or higher than a first threshold, and / or the passage of at least one vehicle on the course at a speed greater than a second threshold greater than said first threshold.
• the electronic management circuit 9 of the autonomous detection device 3 can be programmed so as not to generate a transmission / reception phase as long as the developed state criterion does not change state and generate a phase of transmission / reception 15 as soon as the developed state criterion is modified in accordance with a requirement, this generated transmission / reception phase being established to be synchronized with the first phase or communication window 1 3 enabled by the central station 2. means that, as shown in FIGS. 4 and 5, certain phases or communication windows generated by the central unit 2 will not give rise to exchanges between the central unit 2 and the autonomous detection device 3.
• the electronic management circuit 9 of the autonomous detection device 3 is also programmed so that, when no vehicle is traveling on the path P, the duration of the pause phase 16 is limited to a predetermined maximum value programmed.
• the signals sent by the detection device 3 to the central unit 2 may contain information relating to the successive states and the successive changes of state of the traffic on the path P.
• the central unit 2 may be programmed to develop traffic light control signals controlling the traffic in the intersection C, also taking into account the signals received from other detection devices 3a.
• the signals sent by the detection device 3 to the central unit 2 may contain information relating to its operating state.
• the signals sent by the central unit 2 to the detection device 3 may contain adjustment parameters of the traffic status criteria, the traffic state criteria change information, as well as the re-programming information.
• the adjustment parameters may relate to the range of the sensor, in order to adjust the sensitivity of the gain of the electronic circuit of the sensor, the direction of detection or the direction of the traffic on the monitored path, the filtering before detection of the traffic as a function of the travel distance or the detected motion length, the speed threshold of the detection, the compensation of the error due to the angle of inclination of the sensor measurement with respect to the movement of the vehicles, the redundancy or recursive digital filtering parameters, luminous means validation or control, filtering of the spatial attenuation due to the ground wave, detection of passage of vehicles, detection of the speed of vehicles, detection of the presence of vehicles, as well as various technical alarms such as the state of the power source of the autonomous device.
• the scanning phases 1 1 of the sensor 7 can be between 1 ms and 1360 ms,
• the pause phases 12 of the sensor 7 may be between 100 ms and 1000 ms
• the transmission / reception phases 13 of the transmission / reception circuit 6 of the central unit 2 can be established with a periodicity of between 1 ms and 200 ms
• the transmission / reception phases 15 of the transmission / reception circuit 8 of the detection device 3 may be between 1 ms and 200 ms, like the transmission / reception phases 13,
• the pause phases 16 of the transmission / reception circuit 8 of the detection device 3 may be between 50 ms and 2000 ms.
• At least one detection device 3 could advantageously be programmed so that it can be used as a relay, then functioning as a central unit for receiving signals from at least one other device. detection, which could not be picked up by the central 2, and to retransmit these signals to the central.

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• 2010
  • 2010-03-19 FR FR1051999A patent/FR2957708B1/fr not_active Expired - Fee Related
• 2011
  • 2011-03-15 ES ES11710451T patent/ES2704324T3/es active Active
  • 2011-03-15 EP EP11710451.3A patent/EP2548187B1/de active Active
  • 2011-03-15 WO PCT/EP2011/053859 patent/WO2011113817A1/fr active Application Filing

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