WO1993022756A1 - Dispositif de controle de l'aptitude au fonctionnement de dispositifs de mesure de la vitesse utilises dans la surveillance de la circulation - Google Patents

Dispositif de controle de l'aptitude au fonctionnement de dispositifs de mesure de la vitesse utilises dans la surveillance de la circulation Download PDF

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Publication number
WO1993022756A1
WO1993022756A1 PCT/EP1993/001035 EP9301035W WO9322756A1 WO 1993022756 A1 WO1993022756 A1 WO 1993022756A1 EP 9301035 W EP9301035 W EP 9301035W WO 9322756 A1 WO9322756 A1 WO 9322756A1
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WO
WIPO (PCT)
Prior art keywords
speed
counting
sensors
error
counter
Prior art date
Application number
PCT/EP1993/001035
Other languages
German (de)
English (en)
Inventor
Mario Gross
Peter Kuhn
Original Assignee
Robot Foto Und Electronic Gmbh & Co Kg
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 Robot Foto Und Electronic Gmbh & Co Kg filed Critical Robot Foto Und Electronic Gmbh & Co Kg
Priority to EP93909860A priority Critical patent/EP0638194A1/fr
Publication of WO1993022756A1 publication Critical patent/WO1993022756A1/fr

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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
    • G08G1/052—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed
    • G08G1/054—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed photographing overspeeding vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
    • G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers

Definitions

  • the invention relates to a device for checking stationary speed measuring devices for traffic monitoring, in which sensors are installed in the pavement, which respond to vehicles traveling over them, and signal evaluation means are provided, to which the sensor signals are connected and which deliver measured speed values If a permissible maximum speed is exceeded by a vehicle traveling over it, a recording of the vehicle can be triggered by the camera, and the signal evaluation means furthermore contain error detection means which prevent the measured speed values from being taken into account when certain errors occur.
  • Stationary speed measuring devices are known for detecting exceedances of the permissible maximum speed by vehicles. These speed measuring devices contain sensors that are embedded in the road surface at a predetermined distance and respond to vehicles traveling over them. Such sensors can be piezoelectric or otherwise pressure sensitive cables (FR-A-2 471 066; GB-A-2 084 774, EP-A-0 267 032). The sensors deliver electrical sensor signals when the wheels of a vehicle drive over them. From the time interval of the Sensor signals can be used to determine the speed using the signal evaluation means. If the vehicle speed measured in this way exceeds a predetermined threshold value which corresponds to a permissible maximum speed, the signal evaluation means trigger a photographic camera. The camera records the vehicle traveling too fast. The license plate number and possibly the driver are also photographed.
  • the measured speed and other data are reflected in the photograph. It is also known to represent this information by means of matrices of light-emitting diodes and to reflect it character by character on the edge of the film during film transport (DE-C-3,034,161). It is also known to arrange three sensors in succession (EP-B-0,042,546; "Radio Mentor Electronic” 44 (1978), 19-20, EP-A-0 r 387.093). The three sensors determine a total of three measuring sections: a first measuring section lies between the first and the second sensor in the direction of travel. A second measuring section lies between the second and the third sensor. A third measuring section finally results between the first and the third sensor. It is known to obtain speed measurement values from the signal distances of the sensor signals for all three measurement sections.
  • the speed measurements obtained may form the basis of a procedure for violating traffic rules.
  • the speed readings must therefore withstand legal judicial review. ⁇ All speed readings that could give rise to any doubts are discarded.
  • the signal evaluation means therefore contain error detection means which classify speed measurement values as defective according to certain criteria. In the case of such speed measurement values classified as incorrect, the triggering of the camera is usually prevented. Such speed measurements are not registered in any way.
  • the criteria according to which speed measurement values are assessed as faulty can be the following: A sensor pulse is missing. The deviations of the speed measurement values obtained with the three measurement sections are too large. The first measuring pulse does not come from the first sensor. Two sensors are triggered almost simultaneously.
  • the object of the invention is to control the functionality of the device in a simple manner in a device of the type defined in the introduction and to avoid expensive re-calibration of the device in any case in the majority of cases.
  • the signal evaluation means contain counting means for counting the frequency of the occurrence of the error criteria.
  • the invention is based on the knowledge that the various error criteria result in a statistical average of a larger number of measurements for a specific system, a typical frequency distribution of the errors.
  • This frequency distribution represents a kind of "fingerprint" of the system.
  • Such a frequency distribution is determined immediately after the first calibration or before this first calibration. As long as this frequency distribution essentially over time, ie over months remains unchanged, it can be assumed that the system itself has remained essentially unchanged.
  • Counting means for counting the total number of measurements and counting means for counting the number of determined exceedings of the permissible maximum speed are preferably also provided. This allows the frequencies of the errors to be standardized.
  • the number of detected speed overshoots in relation to the total number of speed measurements is generally characteristic for the particular system and the installation location. Here, too, deviations indicate changes to the system.
  • the counts of the counting means are expediently permanently storable according to predetermined criteria.
  • the storage can take place after a predetermined number of measurements. This number must be so large that it permits a statistical evaluation of the errors.
  • the storage can also take place after a predetermined time. It can but the storage advantageously takes place either after the specified number of measurements has been reached or after the specified time has elapsed, depending on which event occurs earlier.
  • the storage can take place in that the counter readings of the counting means can be transferred to a film on which the recordings of the vehicles exceeding the permissible maximum speed are made.
  • the counter readings can be output as LEDs via LEDs and transferred to the film edge during film transport.
  • Fig.l shows a block diagram of a speed measuring device with a device for statistical verification of functionality.
  • Fig.2 shows typical waveforms, such as those obtained with sensors of the speed measuring device of Fig.l.
  • FIG. 3 shows a diagram of the error distribution which is characteristic of a specific speed measuring device at a specific measuring station.
  • the speed measuring device contains three sensors 10, 12 and 14 embedded in a road surface at fixed intervals one behind the other.
  • the sensors 10, 12 and 14 are piezoelectric cables which extend across the roadway or one half of the roadway.
  • the sensors 10, 12 and 14 emit signals when a vehicle passes over them.
  • FIG. 2 show typical signals as they are obtained during normal operation from two notable sensors, for example sensors 10 and 12.
  • the signals each receive a first tip 16 and 18 and a second tip 20 and 22.
  • the first tips 16 and 18 are caused by the front wheels of the vehicle.
  • the second tips 20 and 22 are caused by the " rear wheels of the vehicle.
  • the signals form decaying vibrations.
  • the leading edges of the signals serve as measuring points.
  • the time intervals between the signals supplied by the various sensors 10, 12 and 14, for example, are used for speed measurement 16 or 18.
  • the counter 24 is switched on by the signal 16 from the sensor 10 and counts counting pulses which are supplied at high frequency by a quartz-controlled oscillator
  • the counting is interrupted by sensor 12.
  • the counter 26 is switched on by the signal 18 of the second sensor 12.
  • the counter 26 then also counts counting pulses which are supplied at high frequency by a quartz-controlled oscillator Sensor 14.
  • the counter 28 is finally cleared by the signal of the first S ensors 10 turned on and also counts high frequency counts from a crystal controlled oscillator.
  • the counter 28 is stopped by the first signal of the third sensor 14.
  • the meter readings each provide a measure of the time it takes for the vehicle to travel through the measurement sections between the first and second sensors 10 and 12, between the second and third sensors 12 and 14, and between the first and third sensors 10 and 12, respectively. 14. From these times and the known lengths of the measuring sections, the speed is determined by a computer 30 according to the relationship between speed and distance through time. This value is displayed by means of a display device 32. The speed value obtained exceeds a predetermined threshold, corresponding to a permitted maximum speed, via an output 34 of the triggering of a phot ⁇ graphischen camera 36. The threshold is triggered a photograph when it is exceeded, ° is input through an input device 38th
  • the speed measuring device contains
  • Error detection means 40 The error detection means 40 contain error analysis means 42, which are represented by an appropriately labeled block. The signals from the three sensors 10, 12 and 14 are applied to the error analysis means 42. The error analysis means recognize errors of an error type "1" and errors of an error type "2". An error of error type "1" exists if two or all three sensors deliver a signal at the same time. Then a counter reading of one of the counters 24, 26 or 28 becomes zero. Such signals can then have been caused by crosstalk between the sensors. An error of error type "2" exists if the signals from the sensors appear in the wrong order. In this case too, the counters do not count any counts. The signals may then have been caused by a vehicle traveling in oncoming traffic. In both cases, the measured value is suppressed by the error analysis means 42. The camera is not triggered.
  • the errors of type "1" detected by the error analysis means 42 are counted in a counter 44.
  • the errors of type "2" detected by the error analysis means 42 are counted in a counter 48.
  • the counter readings that have not been rejected as faulty by the fault analysis means 42 are, as indicated by the arrows 50, fed to comparator means 52, which are represented by a correspondingly designated block.
  • the comparator means 52 compare the times determined by means of the counters 24, 26 and 28 (or the speeds resulting therefrom) with one another.
  • a type 3 error occurs when the speed measurements obtained differ from one another by more than a certain amount, for example 3 km / h or 3% at speeds above 100 km / h. Even in such a case, the speed measurement is classified as unsafe and is not taken into account. The camera is not triggered. Such Deviations can occur in particular if the vehicle brakes while driving through the test sections.
  • a counter 54 also counts the number of "3" errors that have occurred. If none of the errors of type "1", "2" or "3" has occurred, the time or speed measurement value is applied to the computer 30.
  • the computer 30 finally detects errors of type "4". These errors consist in the fact that not all sensors 10, 12 and 14 have delivered a signal. These errors are also counted in a counter 56.
  • the speed measurement value is passed from the computer 30 to an output register 58. If the measured speed value exceeds the permissible maximum speed, then the computer 30 triggers the camera 36 via an output 60.
  • the camera is a motor-driven registration camera.
  • the computer also controls a frame counter 62 which counts the number of pictures taken. Furthermore, the computer can control a time and date display 64. Furthermore, the total number of measured vehicles (whether they have exceeded the permissible maximum speed or not) is recorded by a counter 66. An output register 68 contains a code that identifies the plant in question. Finally, the maximum permissible speed applicable at the location of the installation is stored in an output register 70. Such data can be entered into the computer via a keyboard.
  • the camera 36 is triggered when an excessive speed is determined.
  • information is transmitted to the film edge via a light-emitting diode matrix controlled by the output registers. This is done as described in DE-A-30 34 161.
  • an inflated one Speed is obtained on the film edge "that shown in the right stripe in Fig.l patterns are given.
  • a similar picture (calibration photo) is taken when an initial calibration is carried out.
  • Counters 44, 48, 54 and 56 are now provided to monitor the functionality of the system.
  • the counters 62 and 66 are used for this task. If one plots the total number of observed vehicles, the number of detected violations and the frequencies of the different types of errors in a diagram according to FIG. 3, after a larger number of observed vehicles, which allows a statistical evaluation, then results in certain "curve shape" 82. It has been shown that this curve shape 82 is characteristic of a certain system and a certain installation location. At one point the likelihood that the permissible maximum speed will be exceeded, for example due to the road conditions, is higher, at another point the likelihood is lower. Accordingly, there will be a certain relationship between the total number of vehicles and the number of violations found.
  • the statistical photos have a pattern, as indicated in Fig.l by the left stripe on the right side.
  • Information is also transferred to the edge of the film via a light-emitting diode matrix during film transport.
  • the count of the counter 44 appears at DER 'point 88.
  • the counter reading of counter 48 appears at " position 90.
  • the counter reading of counter 54 appears at position 92.
  • the counter reading of counter 56 appears at point 94. There is no registration of a speed measurement value or a permissible maximum speed. However, the number of recordings made by counter 62, the date and time by output register 64, the total number of vehicles observed by counter 66 and the code by Output registers are recorded at positions 74, 76, 96 and 78, respectively.
  • a calibration photo can be triggered manually by a hand switch 98.
  • a statistical photo can also be triggered by a hand switch 100.
  • the described device is used to monitor the functionality as follows:
  • the installed system is first calibrated in the usual way by the responsible calibration authority, e.g. the Physikalisch-Technische Bundesweg.
  • the calibration is documented by Eichphotos.
  • the frequency of the errors of the different types as well as the total number of vehicles observed and the number of violations found are determined during a statistical period of 200 recordings or 4 hours and documented by a statistical photo of the type shown in FIG.
  • Such a statistical photo can also be triggered by hand.
  • An error profile of the type shown in FIG. 3 can be obtained from this.
  • the data thus obtained are archived.
  • the newly obtained statistical photos and error profiles are compared with the archived data at certain intervals. If there are significant deviations, a re-calibration can be carried out.
  • Such a re-calibration can, however, be dispensed with as long as the statistical photos show essentially the same error profiles as were obtained immediately after the first calibration.
  • the statistical photos are triggered automatically.

Abstract

Afin de permettre le contrôle de l'aptitude au fonctionnement de dispositifs stationaires de mesure de la vitesse utilisés pour surveiller la circulation, comprenant des capteurs posés dans le revêtement de la route sensibles aux véhicules qui passent sur eux, générant des valeurs de mesure de la vitesse, alors que le dépassement d'une vitesse maximale admissible par un véhicule passant sur les capteurs déclenche une prise de vue du véhicule par un appareil photographique, des dispositifs de reconnaissance d'erreurs empêchent les valeurs de mesure de la vitesse d'être prises en considération lorsque surviennent des critères déterminés d'erreur. Des compteurs comptent la fréquence d'apparition des critères d'erreur. Chaque installation se caractérise par une distribution statistique déterminée des différents critères d'erreur. Des écarts par rapport à cette distribution permettent de conclure que l'installation doit être modifiée.
PCT/EP1993/001035 1992-04-30 1993-04-29 Dispositif de controle de l'aptitude au fonctionnement de dispositifs de mesure de la vitesse utilises dans la surveillance de la circulation WO1993022756A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93909860A EP0638194A1 (fr) 1992-04-30 1993-04-29 Dispositif de controle de l'aptitude au fonctionnement de dispositifs de mesure de la vitesse utilises dans la surveillance de la circulation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4214595.3 1992-04-30
DE19924214595 DE4214595A1 (de) 1992-04-30 1992-04-30 Vorrichtung zur ueberpruefung der funktionsfaehigkeit von geschwindigkeits-messeinrichtungen fuer die verkehrsueberwachung

Publications (1)

Publication Number Publication Date
WO1993022756A1 true WO1993022756A1 (fr) 1993-11-11

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PCT/EP1993/001035 WO1993022756A1 (fr) 1992-04-30 1993-04-29 Dispositif de controle de l'aptitude au fonctionnement de dispositifs de mesure de la vitesse utilises dans la surveillance de la circulation

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EP (1) EP0638194A1 (fr)
CA (1) CA2134659A1 (fr)
DE (1) DE4214595A1 (fr)
WO (1) WO1993022756A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10049852A1 (de) * 2000-10-09 2002-04-25 Dirk Wagner Verfahren und System zur Verkehrsüberwachung
CN103106798A (zh) * 2012-12-20 2013-05-15 黑龙江省电力有限公司信息通信分公司 画面识别触发的交通测速拍照系统

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960003444A (ko) * 1994-06-01 1996-01-26 제임스 디. 튜턴 차량 감시 시스템
US6111523A (en) 1995-11-20 2000-08-29 American Traffic Systems, Inc. Method and apparatus for photographing traffic in an intersection
US5948038A (en) 1996-07-31 1999-09-07 American Traffic Systems, Inc. Traffic violation processing system
US5929787A (en) * 1996-11-27 1999-07-27 Mee; Gary L. Vibration actuated traffic light control system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0042546A1 (fr) * 1980-06-14 1981-12-30 Reinhold Fischer Système de mesure de vitesse, en particulier pour véhicules routiers
EP0350751A2 (fr) * 1988-07-14 1990-01-17 Multanova Ag Procédé et appareil de surveillance de la vitesse de véhicules utilisant un radar Doppler de mesure de vitesse et application du procédé
EP0387092A2 (fr) * 1989-03-10 1990-09-12 Franz Josef Gebert Equipement pour la surveillance du trafic
EP0517359A2 (fr) * 1991-06-04 1992-12-09 Lucas Industries Public Limited Company Procédé et appareil pour vérifier la mesure de la vitesse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0042546A1 (fr) * 1980-06-14 1981-12-30 Reinhold Fischer Système de mesure de vitesse, en particulier pour véhicules routiers
EP0350751A2 (fr) * 1988-07-14 1990-01-17 Multanova Ag Procédé et appareil de surveillance de la vitesse de véhicules utilisant un radar Doppler de mesure de vitesse et application du procédé
EP0387092A2 (fr) * 1989-03-10 1990-09-12 Franz Josef Gebert Equipement pour la surveillance du trafic
EP0517359A2 (fr) * 1991-06-04 1992-12-09 Lucas Industries Public Limited Company Procédé et appareil pour vérifier la mesure de la vitesse

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10049852A1 (de) * 2000-10-09 2002-04-25 Dirk Wagner Verfahren und System zur Verkehrsüberwachung
CN103106798A (zh) * 2012-12-20 2013-05-15 黑龙江省电力有限公司信息通信分公司 画面识别触发的交通测速拍照系统

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Publication number Publication date
DE4214595A1 (de) 1993-11-04
EP0638194A1 (fr) 1995-02-15
CA2134659A1 (fr) 1993-11-11

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