DE2234446B1 - TRAFFIC MONITORING DEVICE - Google Patents

Description

The invention relates to a device for traffic monitoring at traffic light-controlled intersections by means of a photographic camera, which switches from one to the Approach a vehicle entering the intersection

»5 corresponding sensors can be triggered and by which at the same time the intersection and a timer is recorded with means for establishing the temporal relationship between triggering the camera and the beginning of the blocking phase.

Devices of this type are intended to prevent traffic violations, namely specifically to establish conclusively the entry into an intersection during the blocking phase of a traffic light system, by photographing the intersection and preferably also the traffic light together with the trespassing vehicle. Such a recording can then be used to identify the transgressor Can be removed from the vehicle. It is also conclusively recorded that this vehicle at Blocking phase had driven to the intersection. Such devices for traffic monitoring have been around since known for a long time (German patent 683 658, USA patent 2347194).

It also often presents difficulties for the accused in determining which driver is using the vehicle identified in this way has committed the traffic violation. It is therefore with such photographic Traffic monitoring devices known, at the same time with the monitored vehicle date and Record the time (German patent specification 946 594). This clearly defines the time of the traffic violation. It serves as a timepiece a conventional clock with a pointer display. It is also known to include a second hand. This is a speed control in which a monitoring Vehicle follows a monitored vehicle at the same speed and photographic Takes pictures at certain time intervals.

The accused can object that he is only at the moment of switching over the Traffic lights entered the intersection so that he could no longer stop in front of the intersection. Around To counter this objection, a device for the photographic surveillance of traffic lights known, in which a clock is photographed with the traffic light system (USA.-Patent 2871088).

3 4

There are several recordings of hand transition frequency of clock pulses according to the triggered. From these recordings and the time units (day, hours, minutes, seconds, recognizable states of the traffic light system can then be divided into tenths of a second) and their meter hand a diagram can be determined in which state digital electronic display glasses via decoders temporal relationship of the time of the Einfah- 5 members that act as storage and display in the intersection and the blocking phase of the traffic light device shift register with parallel inputs to stand by each other. are provided, which are combined with the binary counting levels

It is further connected to the automation of this process are and decoder also digital elekeine device apply for traffic monitoring to am- tronic display elements and their pelgeregelten intersections known by means of a photo- ¹⁰ control inputs of a control pulse from the Amtographischen camera in which the Ka pel to At the beginning of the blocking phase,
mera during the blocking phase by a contact In order to ensure that the time display is

threshold can be triggered and in which a before rend the duration of the photograph switching of the traffic signal to the blocking phase does not change, it can be provided that the Zeitmes starting position occupying timers ^{contains 1} S ser shift register with parallel inputs, which is the one in the course of Switching can be switched on and connected to the binary counting stages and the digital electrical display elements can be reset via the decoder after the end of the blocking phase to the starting position (German patent 1154963). apply and when the camera is triggered this timer is obtained in a known manner on the control pulse in such a way that the display of the film is also mapped. ²⁰ timepieces for the duration of the photographic

It is also known that such a device remains stored.

There is also a clock to display the date and there is another solution to the latter problem

To provide the time and to include it (Siemens - in that at the entrance of the timer one of the Special print »Traffic surveillance - automatic trigger pulse of the camera-controlled delay series« from "Police, Technology, Traffic", Issue 8, August 25 circuit is arranged through which when occurrence 1965, pages 269 to 272). of the trigger pulse, the next clock pulse is delayed

In this known arrangement, two are unified and in the pulse gap of the next Other independent clocks are required, from which clock pulses are counted.

one is designed as a stopwatch and after each locking finally you can get the desired constancy of the

phase must be reset to the starting position. 3 ° time display for the duration of the recording also

The invention has for its object to achieve by that at the entrance of the timer a Devices of the type mentioned at the outset have a first monostable multivibrator, which is evidently controlled by the clock single timers, both the impulses and by a Kamenauen Time of the traffic violation as well as raimpuls can be blocked, and that parallel to the first whose relationship at the time of switching 35 monostable multivibrator is a second monostable to hold precisely on the blocking phase. Tilting stage is provided, which is from the camera

According to the invention this is achieved in that the pulse is controlled and a counting pulse on the the only timepiece that gives the local time with at least a timepiece. It will then be just before the recording Indicates tenths of a second accuracy and that an additional pulse has been given to the timer and off the traffic light controlled storage and display advance 4 ° for the pulse count for the duration of the recording direction. is intended to which the display of the blocked.

Some embodiments of the invention are automatic at the beginning of the blocking phase

is transferable and which together with the time- below with reference to the drawings knife and the intersection is recorded. explained in more detail. It shows

It is thus - similar to the USA patent - 45 Fig. 1 an arrangement according to the invention,
script 2 871088 - a timepiece with photographed, F i g. 2 a possible modification in which a

which shows the exact time at which the recording was switched on became. This point in time is ensured in the same way as in the case of the arrangement point in relation to which the order of Fig. 1,

Switching to blocking phase takes place, but does not need 5 ° F i g. 3 another way of maintaining the constancy of the additional recordings to be made, but display during the photographic recording the time of the switchover is ensured by a memory.

rather and display device held. In both the circuit according to Fig. 1 are clock pulses

In contrast to the arrangement according to the German patent for the timepiece, which is designed as a digital counter, font 1154 963 and the Siemens special print, 55 is normally derived from the network frequency. The no resettable timer provided, but mains voltage for this purpose is given to one of the timers to display the local time - Schmitt trigger S ₁ , which is used in time to determine the part of the blocking phase delivers square-wave pulses. These square-wave pulses geteln in which the vehicle is driven into the intersection via a NAND element N ₃ and a diode D ₃ . 60 to a Schmitt trigger S ₂ . The output pulses

A particularly advantageous embodiment of the Er- the Schmitt trigger S ₂ for frequency detection is that the timer is given a digital divider B1 ₁₅ through which a frequency division is counted and that the count of the small ones takes place by a factor of 5. The frequency _{divider B1 provides 15} time units corresponding digits of this digital thus at a mains frequency of 50 hertz a counter by an output frequency of 10 hertz given at the beginning of the blocking phase, ie a control pulse which can be transmitted to a register. per tenth of a second. These 10 Hertz pulses that

This can be done in such a way that the timers are hereinafter referred to as "clock pulses", contains binary counting stages, through which an input is sent to a time counter designed as a digital counter

knife given.

The DC supply voltage for the device is normally supplied by a power supply unit 10. If the mains voltage fails, there is an automatic switchover by means of a switch 12 to supply from a battery 14. At the same time, there is a switchover to an RC generator 16 for generating clock pulses. In this case, the DC supply voltage occurs on a line 18 during mains operation, via which the Schmitt trigger S ₁ receives its supply voltage and the NAND element N _{3 is} opened, and in battery operation on a line 20. The NAND element is connected via line 20 Opened N ₂ , which receives 22 pulses from the RC generator 16 via a line. These pulses are then also given to the Schmitt trigger S _{2 via the diode D 2} .

It is envisaged that a quartz generator 24 can be used as a clock generator. This is then used for both mains and battery operation. The quartz generator receives its supply voltage via an output line 26 of the changeover switch 12, which is connected to both mains and battery operation. The output pulses of the quartz generator are applied via a switch 28 to a NAND element N ₁ , which is kept open via diodes 30 and 32 on both line 18 and line 20. The pulses from the quartz generator 24 also reach the Schmitt trigger S ₂ via a diode D ₁ .

The digital counter contains counting levels Bl ₁ to B2 ₁₀ to display the day, hour, minute, second and tenths of a second. The counter readings are normally taken continuously from shift registers R ₁ to R ₁₀ each with four parallel inputs a _v b _v C ₁ , d _x , etc., decoded by decoders D ₁ to D ₁₀ and displayed by display tubes Z ₁ to Z _10.

When a photograph is taken, a pulse appears from the camera via a control part ST1 on all shift registers A ₁ to R ₁₀ and blocks the transfer of the counters from counting stages BI ₁ to B2 ₁₀ by the shift registers for the duration of this pulse. Rather, the last counter reading is stored in the shift registers.

The shift registers .R ₁ to i? ₁₀ are known electronic components, which are usually connected in such a way that they take over the status of the connected binary counter in parallel to a control pulse via the four inputs and store it until the end of the control pulse. These shift register modules are used here to take over the counter readings of the counting levels BI ₁ to B2 ₁₀ and, if necessary, to save them.

By using the shift registers R ₁ to R ₁₀ it is achieved that the display on the display tubes Z ₁ to Z ₁₀ remains constant for the duration of the photograph, so that a clear reading is guaranteed.

There are also shift registers R ₁₁ to R ₁₄ which are present at the outputs a _v b _v C ₁ , U ₁ , etc. of the counter stages Bl ₁ to Bl ₄ , which indicate minutes, seconds and tenths of a second. These are controlled by the traffic light system via a control part STl, in such a way that they take over and hold the counter reading at the beginning of each locking phase. This counter reading is decoded by means of decoders D ₁₁ to D ₁₄ and displayed by display tubes Z ₁₁ to Z _14.

The display tubes Z ₁ to Z ₁₀ and Z ₁₁ to Z ₁₄ are recorded with a picture of the monitored intersection. photographed. They provide information about when the traffic light is switched to the blocking phase and when the recording was made. It can also be deduced from this whether the entry into the intersection takes place approximately immediately after the start of the blocking phase or some time afterwards.

ίο To avoid that during the duration of the If the counter is incremented for a photographic recording, the shift register can also be used instead other means may be provided. Such an arrangement is shown in FIG. 2 shown. These are

¹ S to a circuit which is switched on between the points X _A to X _B in FIG.

The shift registers R ₁ to i? ₁₀ can be omitted for this, as can the associated control circuit STl. The arrangement of Fig. 2 is based on the principle of delay appearing during the duration of the photographic recording clock pulse so that it will be counted only after completion of the recording in a pulse gap between succeeding clock pulses in the counter Bl ₁ to J32 _10th

The circuit according to FIG. 2 contains an RC element with a resistor R ₁ and a capacitor C ₁ . This means that the clock pulse arriving at X _{A is} delayed by around 50 ° (a full pulse interval = 360 °). This ensures that the clock pulse cannot coincide with the control pulse from the camera, which is also synchronized with the clock frequency. If no control pulse appears, the NAND element N _{4 is} open and the NAND element N _{5 is} blocked via the inverter 32. The output of the RC element R ₁ C ₁ triggers a monostable multivibrator MF1 via a resistor 34. A defined pulse of around 1 ms duration is thus obtained again. This pulse goes through the NAND gate N ₄ and a diode 36 to the counter.

When the recording is triggered, the NAND element N _{4 is} blocked by the control pulse at the input 38 and the NAND element N _{5 is} opened via the inverter 32 for this purpose. The output pulse of the monostable multivibrator MFl then does not reach the output X _B and the counter directly, but triggers a monostable multivibrator MFl . When the monostable multivibrator MF1 is tilted back, a monostable multivibrator MF3 is triggered, which again supplies an output pulse of 1 ms duration. This output pulse is given via a diode 40 to the output X _{B of} the delay circuit. The switching time of the monostable multivibrator is chosen so that an additional phase shift of 410 ° occurs. The clock pulse flowing via N ₅ therefore only enters the pulse gap of the next and the next but one clock pulse _{after opening IV 4.}
Another solution to the same problem is shown in FIG. 3. This figure also shows a circuit which is switched between the points X _A and X _B of FIG. 1 and the shift registers R ₁ to i? ₁₀ makes it unnecessary. The counter stages Bl ₁ to Bl ₁₀ are then directly connected to the decoders D ₁ to D ₁₀ .

In the arrangement according to FIG. 3 an additional pulse is added to the The counter is fed and then for a clock during the photographic recording of the passage of the

2 234 44β

Clock pulses to the counter blocked.

Normally, the monostable multivibrator MF4 is triggered by the clock pulses at input X _A , to which the clock pulses are fed via the normally open AND gate 42. The output pulses of the monostable multivibrator MF4 go through a diode 44 to the output X _n and to the counter. At the beginning of the recording, the AND gate 42 is blocked by a control pulse from the camera at the "clock shift" input via input 48. The monostable multivibrator is no longer triggered by a clock pulse that appears during the photograph.

In parallel to the monostable flip-flop MF4 , a monostable flip-flop MF5 is provided. This is triggered by the control pulse at input 46 via an inverter 50 and sends a pulse of 1 ms duration to the output via diode 52 before it is recorded. The control pulse has a duration of a tenth of a second, i.e. the distance between two successive clock pulses.

In the embodiments of FIGS. 2 and 3, it is assumed that the exposure time of the photographic Recording shorter than the distance between the clock pulses, i.e. shorter than a tenth of a second is.

1 sheet of drawings

309 549/99

Claims (7)

Patent claims: 1. Device for traffic monitoring at traffic light-regulated road crossings by means of a photographic camera, which can be triggered during the blocking phase by a sensor responding to the entry of a vehicle into the intersection and through which the intersection and a timer is recorded at the same time with means for determining the temporal relationship between Triggering of the camera and beginning of the blocking phase, characterized in that the single timer shows the local time with at least tenths of a second and that a storage and display device (A ₁₁ to R ₁₄ , Z ₁₁ to Z ₁₄ ) controlled by the traffic light is provided on which the display of the timer (Bl ₁ to Bl ₁₀ ) can be automatically transmitted at the beginning of the blocking phase and which is recorded together with the timer and the intersection. 2. Apparatus according to claim 1, characterized in that the timer is a digital counter (Bl ₁ to Bl ₁₀ ) and that the count of the digits corresponding to the small time units of this digital counter by a control pulse (STl) given at the beginning of the blocking phase to a register ( A ₁₁ to 2? ₁₄ ) is transferable. 3. Apparatus according to claim 2, characterized in that the timer contains binary counting stages (Bl ₁ to Bl ₁₀ ) by which an input frequency of clock pulses corresponding to the time units (day, hours, minutes, seconds, tenths of a second) is divided and their Counter readings via decoders (D ₁ to D ₁₀ ) act on digital electronic display elements (Z ₁ to Z ₁₀ ) that shift registers (R ₁₁ to R ₁₄ ) with parallel inputs are provided as storage and display devices, which are connected to the binary counting stages (Bl ₁ to Bl ₄ ) are connected and via decoders (D ₁₁ to D ₁₄ ) also act on digital electronic display elements (Z ₁₁ to Z ₁₄ ) and their control inputs are acted upon by a control pulse (STl) from the traffic light at the beginning of the blocking phase. 4. Apparatus according to claim 3, characterized in that the timer contains shift registers (R ₁ to i? ₁₀ ) with parallel inputs which are connected to the binary counting stages (Bl ₁ to Bl ₁₀ ) and via the decoder (D ₁ to D ₁₀ ) act on the digital electrical display elements (Z ₁ to Z ₁₀ ) and receive a control pulse (STl) when the camera is triggered, in such a way that the display of the timer remains stored for the duration of the photograph. 5. Apparatus according to claim 3, characterized in that at the entrance of the timer a delay circuit (Fig. 2) controlled by the trigger pulse of the camera is arranged is through which the next clock pulse is delayed when the trigger pulse occurs and into the Pulse gap of the following clock pulses is counted. 6. Apparatus according to claim 5, characterized in that the delay circuit contains two gates (N ₄ , N ₅ ) , of which the first normally passes the clock pulses to the timer (Bl ₁ to J52 ₁₀ ) and by a trigger pulse (38) of the camera can be locked and of which the other (N ₅ ) is opened by the trigger pulse (32) and a clock pulse via a monostable multivibrator (MFl) is delayed on the timer (Bl ₁ to Bl ₁₀ ) . 7. The device according to claim 3, characterized in that at the input of the timer there is a first monostable multivibrator (MF4) which is controlled by the clock pulses and can be blocked by a camera pulse (46,48), and that parallel to the first monostable multivibrator (MF4) a second monostable multivibrator (MFS) is provided, which is controlled by the camera pulse (46, 50) and sends a counting pulse to the timer.