DE2321589A1 - CONTROL UNIT FOR ROAD TRAFFIC SIGNAL SYSTEMS - Google Patents

Description

Control device for road traffic signal systems The invention relates to a control unit for a road traffic signal system with an adjustable program for the switching commands to be issued to the lamps of the signal system, in the case of the known The program unit consists of a synchronous motor control devices for signal systems driven control roller system, or similar basic technical elements, where according to the desired signal sequence control cam or slats via scanning lever Operate the switch, which then switches the corresponding on or off via relays The lights of the signaling system. With increasing number of at an intersection set up signal generator z. B. FahXsig encoder for straight-ahead directions, for left-turns, for $ Nw right-turners and penitent leagues, the well-known, Control units working with control rollers are very spacious, very complex in terms of construction and expensive, all the more if the control is not just a fixed program, but variable programs should also be made possible.

For example, it is often desirable, for example at night, that the signal system in a signal state for free passage for the main traffic direction stops and that only with special request, for example by a from Pedestrian-operated pushbutton or a pushbutton approaching in the secondary direction Vehicle detecting induction loop, the signal sequence is relayed and that the signal system is back in its after a switching rhythm Hold state lingers Furthermore, it is often desirable to have a signal stop dependent of traffic volume with different programs for them to control signal sequence to be able to, for example by continuously recording the volume of traffic Computer the cycle duration, signal times and / or signal sequence structures the traffic volume be adjusted. The demand for a green wave "also demands that Control-related linking of signal systems at neighboring intersections. About that In addition, the control unit must also include a number of safety devices, thus also ensured in the event of malfunctions or failure of signal lamps is that traffic flows that are hostile to one another never have free travel at the same time displayed becomes, which could be the case, for example, if the lighting equipment on the priority road the signaling device fail and the right of way traffic sign then applies there, at the same time but the signal generators of the secondary direction would switch to "green", if fulfilled With all of these requirements, the known control devices are extremely complex in terms of construction and spacious and are those associated with their programming or reprogramming Laborious work. The invention is based on the object of a much smaller and to create a control device that can be produced more cheaply, programming it with can be carried out in a few simple steps, especially for adapting the program to the values supplied by a computer about the actual traffic or is particularly suitable for fulfilling other constraints.

In addition, the control unit should also counteract the The transmission of incorrect traffic signals must be properly secured.

The solution to this problem is characterized according to the invention by a clock pulse shaper; by a multi-digit clock pulse counter in the form of electronic shift registers, which the clock pulses via a controllable Payment gates are supplied and their outputs from adjustable time switches tapped, with each signal group a time selector switch each for the signal state I-end '', e.g. B. "Red End", and one for the signal state II-End ", e.g." Green End ", are provided; by 2-image logic circuits for two-aspect signaling devices, e.g. B. Pedestrian signaler, which of their associated Time selector switches receive the signals "Status I-End" and "Status 11-End" and switch the SiCnallampen accordingly; and by multi-picture logic circuits for multi-aspect signal generator with status III-I 'and "status IV" phases, z0 3rd yellow and "red / yellow" phases, each of which has a clock pulse counter whose outputs of two adjustable time selection switches as signals for state III-end "and state IV end ", e.g. I am yellow end" and "red / yellow end", calculated from the corresponding previous one State, can be tapped, the signals together with those related to this signal group belonging signals for state I-end and state II-end "Z0 B.

"Red-End" and "Green-End" are supplied to a reversing logic, which only switches the signal lamps in the required signal sequence.

A number of advantages are achieved by the invention.

The choice of electronic components initially becomes an inexpensive one and structurally small design of the control unit allows. The control of time is here in an extremely precise way by working with clock or clock pulses achieved, wherein it is furthermore advantageous that the detection the Clock pulses used electronic shift registers in a very short time through clear pulses can be reset to zero, like all electronic ones Control interventions are carried out so quickly that no reset times or internal Delay times in the control unit have to be taken into account. To fulfillment of secondary conditions, in particular for the variable adaptation of the cycle to the actual one Traffic volume, can now be used in the impulse technology known working methods and electronic components are used without the structural effort or the manual adjustment work increases significantly.

In a further development of the invention it can be provided that the clock pulse counter another time selector switch for setting a stopping time is connected downstream is, which supplies a blocking signal to the counting gate at the time of the hold, and that an unlock signal to the counting gate via an externally operated request circuit (2 »!) is feedable.

A preferred embodiment of the control device is indicated by a device for changing the clock pulse sequence, the device of one computer that records the traffic volume to one through another Time selector switch can be triggered and to which Counting gate either additional clock pulses or a blocking signal to suppress individual ones Emits clock pulses.

According to the invention, the signal sequence is preferably on a one high traffic volume corresponding fixed program is set and delivers the Calculator a number of additional depending on the decrease in traffic Clock pulses to the counting gate so that the signal times for, for example, "Green!" or "red" can be shortened0 According to the invention, this can be provided at the same time be that the computer when the traffic increases over a assumed certain value a constant number of clock pulses at the counting gate during the "Green" phases suppressed in one or both directions of traffic and so this Phases extended.

A particularly clear, easily adjustable embodiment results when, according to the invention, a pulse frequency of 1 Hz and decadic Counters and timer switches are used0 Finally, according to the invention Another monitoring device for switching on the "green" light on eggs Signal group provided which comprises an AND gate to which the "green" signal the signal group to be switched to Green11 and a signal via an OR gate for failure of the red 'light at one of the hostile Sighal groups is forwarded. This reliably ensures that a signal group can only be switched to "green" if everyone is "hostile to this signal group" Signal groups actually switched to "red".

The control device according to the invention is described below with reference to the drawings explained in more detail, FIG. 1 showing an intersection with four vehicle signal transmitters and eight pedestrian signal heads; Fig. 2 is a diagram for the signal sequence in the Signal groups according to them 1 and FIG. 3 shows a block diagram of the control unit according to the Invention.

In-Fig. 1 are each comprising a "red", "yellow" and "green" lamp Vehicle signal transmitter of the Vorfabrtstrasse A1 and A2, and the vehicle signal transmitter for the side street have the item numbers B1, B2. The signal generators of the group Al, A2 and group B1, B2 are "hostile" to each other. The to the Signal # group ii, A2 enemy pedestrian signaling devices are denoted by b, while those to the Signal head group B1, B2 enemy pedestrian signal head with the position number a are provided.

In Fig. 2 the signal sequences for the individual signal generator groups, briefly called signal groups, illustrated with the aid of a circle diagram, wherein 3600 correspond to a time span of 100 seconds. The angle ç gives the signal cycle or repetition rhythm of the signal sequences and is assumed here to be 74 seconds0 The signal sequences for the two signal generators A1, A2, for the signal generators 31, 32, and for all pedestrian signal heads a and all pedestrian signal heads b are here each assumed the same as one another 0 The "red" signal phase is indicated by a solid Line, the signal phase "green" through a dotted line, the signal phase "yellow" by a dashed line and the signal phase "red / yellow" by two next to each other Arranged lines marked 0 The signal sequence begins with the signal group Al, A2 here at time "O" with a signal "red / yellow", which is followed by a signal phase Connect "Green", a signal phase "Gel-b" and a signal phase "Red". Analogue the signal sequences are shown for the other signal groups, with still on it it is pointed out that in the case of signal groups that are hostile to one another, one "Green" can only be present if the "Red" signal is given for all enemy signal groups present, Big. 2 shows a fixed program. If you can, which will be discussed later will give the priority road "green" all the time want, so means this in the diagram that all signal sequences z. B. be stopped at 25 second and remain in this state until an externally triggered request z0 B, by a push button to be actuated by the pedestrian, the cycle sequence again is switched on, but then after reaching the stop time again "25 seconds" is stopped again.

The adaptation of the cycle to that of one, which will be discussed in more detail later Computer recorded actual traffic volume means that, for example, the Sector indicated by the angle ß from the twentieth to the thirtieth second is eliminated from the basic cycle and thus with a shortened cycle of 72 - 10 = 62 sec is worked, or that such a sector or such a period of time is also inserted into the cycle0 Fig. 3 shows the block diagram of the Control device, which is fed by mains voltage, which is supplied via a transformer1 converted into a voltage of 19 volts and fed to a rectifier 2, in which direct current supply voltages of 15 and 24 volts to supply the Electronics are generated.

The AC voltage of 19 volts is also fed through a frequency filter 3 a clock pulse shaper 4 is supplied to the alternating voltage in a sequence of rectangular Uaktimpulsen 5 converts with a repetition frequency of, 100 Hz.

In the downstream frequency dividers 6 and 7 are repetition frequencies of 10 Hz or 1 Hz. The 1 Hz output signal from 7 becomes a monoflop 8 at the output of which the 1 Hz signal has a guest ratio of 1: 1 (i.e. 0.5 seconds to 0.5 seconds), so that a signal is obtained which for Activation of the yellow light lamps is suitable for flashing operation 0 The 1 Hz output signal of the frequency divider 7 is horn via a counting gate 9 two connected in series Decade counters 10, 11 supplied, which are designed as shift registers and each have ten outputs. Each clock pulse shifts the output signal in the decade counter 10 continues from output line to output line, and passes over every 10 seconds the line 12 sends a pulse to the decade counter 11, which consequently has the tens pays, The outputs of the decade counters 10 and 11 are each to the inputs of a two-digit timer switch 13 connected, the taps 14, 15 to any Time values between 1 and 100 seconds, in the exemplary embodiment after 74 seconds, can be adjusted. If both taps 14, 15 at the same time a Received signal from the decade counters, the AND condition for gate 16 is fulfilled and the time selector switch 13 provides an output signal at 17.

At the outputs of the clock pulse counters 10, 11 there are more similar ones Time selector switches 18, 19, 20, 211 to 21n, 27 connected, which can be set individually are. The two time selection switches 13, 18 are, for example, the signal group Al, A2 assigned, and the time selector switch 13 supplies (according to the example of Fig. 2) at the time of 74 seconds the signal '' Rot-Endel '' and the time selector switch 18 at the time of 40 seconds the signal "end of green". The timers 211 to 21n supply analog in pairs the signals for "red end" and "green end" for the other signal groups B, a, bo The time selector switch 19 is used to set a hold time, the in the diagram according to FIG. 2, "25" was assumed for the second. At this time the breakpoint logic 22 supplies a blocking signal to the counting gate via line 23 9, so that the decade counters 10, 11 remain at the counting position "25". By a Request logic 24, for example by a push button to be actuated by the pedestrian, the counting gate 9 is opened again and the cycle is continued.

Via the time selector switch 20, a point in time within the cycle to which a clock variation circuit 25, which is controlled by the traffic volume detecting computer is triggered via line 26, blocking signals to the counting gate 9 supplies, whereby a certain number of clock pulses is suppressed, so that so the cycle time is extended with higher traffic. Vice versa can the clock variation circuit 25 can also be designed in such a way that when the Traffic volume additional pulses at the counting gate 9 in the clock pulse train of Enter 1 Hz and thus shorten the cycle time.

Furthermore, an end point logic 27 is also shown, which also has a has timer switches 27a connected to the outputs of the counters 10 and 11 The duration of the basic cycle is set using the end point logic Diagram according to Sigo 2 is assumed to be 74 seconds 0 The end point logic returns in of the 74th second a clear or reset signal to the two decade counters 10, 11 so that they immediately return to their zero position.

In Fig. 3, the part enclosed by a dashed line represents of the circuit diagram represents a so-called 4-image logic that a vehicle signal transmitter or a signal group A1, A2, to be controlled in the same way is assigned 0 The same 4 picture Logic is assigned to signal group B1, B2. The term 4-picture here means the signals "red, red / yellow, green, yellow". For the pedestrian signal groups a and b, two "2-image logics" are required in the exemplary embodiment some of the components of the 4-picture logic are omitted.

The 4-image logic 30 according to FIG. 3 receives the output signals of the time selection switch 13, 18, which are each fed to an AND gate 31, 32. The 4-picture logic includes also a decade counter 33, which is directly with the clock pulse train of 1 Hz is fed0 At its output there are two in parallel, each for itself adjustable time selector switch 34, 35, of which the switch 34 to determine the Duration of the "yellow" phase and the circuit 35 for determining the duration of the "red / yellow" phase to serve. These periods of time are adjusted according to the individual circumstances adapted to the intersection, e.g. the permissible travel speed, and then not more changed. The outputs of switches 34, 35 are sent to two more AND gates 36, 37 delivered. The outputs of gates 31, 32, 36 and 37 are via an OR gate 38 supplied to a two blip-flops containing control counter 39, the four different These four switching states are each of the four images assigned, 'and corresponding outputs of the control counter 39 are as further inputs to the AND gates 31, 32, 36, 37 are fed back0 so that ensures that the four different signals only in the desired, special Sequence over the SteuezahPer 39 to the signal logic 40 can happen which then in this special order via the amplifiers 41, 42, 43 switch-on commands supplies rtl for the red lamp first, then rtl for the red lamp and at the same time the yellow lamp, then to the green lamp and then to the yellow lamp.

The red lamp rtl lights up via a current transformer 44 monitored with a subsequent direct current converter 45 and a thread switching logic 46. If the thread of the red lamp rti is broken, this is via the exit 47 indicated by a sonar lamp 48. To increase security is in the Red light lamp a second incandescent lamp rt2 arranged0 in the event of failure of the first Incandescent lamp rtl reports this to the thread switching logic 46 to the signal logic 40, which now the switching on of the second red light incandescent lamp rt2 or via an amplifier 49 causes a second filament in the same lamp, whose or its power supply is again detected via the current switch 44 and the FadenumcBaltlogik 46. Should If this second light bulb also burn out, this will be done once via the control lamp 50 displayed, and the thread switchover logic also supplies via the inverter 51 Signal for the fault status "Red failure" O In the same way the picture logics are designed for the other signal generators, and their signals for "Red failure" are each delivered to the terminals 52 of the 4-image discussed here Logic 30 and vice versa /. All "red failure" inputs 52 are connected to an OR gate 53, the output of which leads to an AND gate 54, to which as a further input the "green" signal gn of the signal logic 40 is given 0 If one of the other, hostile The signal generator did not switch to "red" when the "green" signal occurred, if the AND condition is met at gate 54 and a signal is sent to a monitoring device 55 given. The monitoring device contains a flip-flop 56, which by a monitoring command is toggled and an output command is switched once to on Cut-off relay 57, which, for example, all the lamps of the signal transmitter of the direction of travel and turns off the "red" and "green" lamps of the secondary direction, and also to one Flashing logic 58 supplies which now the flashing light output of the monoflop 8 to the Supplies yellow lamps of the secondary direction.

The response of the monitoring is reported via the control lamp 59.

The fuses for the supply voltages obtained in rectifier 2 control lamps 60 are also assigned, so that here, too, one quickly penetrated Backup figured out can be, with a button can be Check all control lamps for their own functionality via the Lt inputs, The control unit also contains the usual start logic 62 and a manual starter 63, which ensure that the signal system or when restarting after a repair, not in the middle of the cycle, but at the beginning of the same with an upstream preparatory status "all yellow" or another preparation state to be routed is started 0 Furthermore The output of the counting gate 9 is sent to a circulating tb. monitoring circuit 64 supplied, which contains a retriggerable monoflop, which is activated when the is set and which at the latest before the set response time has elapsed a clock pulse has to be retriggered. If this clock pulse is missing, delivers the circuit 64 sends a monitoring signal to the monitoring device 55. The breakpoint logic 22 and the endpoint logic 27 supply the circuit monitoring via line 65 64 a signal that the circulation monitoring circuit is in the triggered state holds until the blocking of the counting gate 9 by these components 22, 27 is canceled is.

The 2-image logic required for the pedestrian signal groups is missing the components 33, 34, 35, 36 and 37 of the 4-image logic 30, is a control counter 39 with only one flip-flop and thus two switching states is used and provides the Signal logic 40 alternately only one switch-on signal for the red lamp and the green lamp or all other two-concept types. Apart from these simplifications the 2-picture logics work in the same way as the 4-picture logics 300 with the 4-image logics 30 can e.g. Be also those currently in force in the Netherlands Signal controls are mastered in which only three images "green", "yellow" and "RotB can be used by the time selector switch 35 for "red / yellow" is set to "zero"

Claims (4)

Claims j. Control unit for a road traffic signal system with an adjustable program control for the switching commands to the lamps of the Signal system, characterized by a clock pulse shaper (4, 6, 7); by a multi-digit clock pulse counter in the form of electronic shift registers (10, 11) to which the clock pulses are fed via a controllable counting gate (9) and their outputs are controlled by adjustable time switches (13, 18, 19, 20, 211 to 21n), with a time selector switch (13) for each signal group the signal "State I end" and one (18) for the signal "State II end" is provided are; through 2-image logic circuits for two handy signal groups such as pedestrian signal groups, which of their associated time selector switches (211 to 21n) the signals "state I-end "and" state II-end "received and switch the signal lamps accordingly; and by multi-picture logic circuits (30) for multi-aspect signal groups with "state" III "and" State IV "phases, which (30) each have a clock pulse counter (33), its outputs from two adjustable timer switches (34, 35) are tapped as signals for "State III duration" and "State IV duration", where the signals together with the signals belonging to this signal group for "State I end" and "State II end" are supplied to a reversing logic (40) which switches the signal lamps in the required signal sequence. 2nd control device according to claim 1, characterized in that the clock pulse counter (10, Ii) another time selector switch (19) for setting an end time is connected downstream, which at the hold time a blocking signal to the counting gate - (9) supplies, and that the counting gate via an externally operated request circuit (24) an unlock signal can be supplied. 30 control device according to claims 1 and 2, characterized by a Device (25) for changing the pulse sequence, the device (25) of one computer (at 26) detecting the presence of traffic to one by another Time selector switch (20) definable time can be triggered and to the counting gate (9) additional clock pulses or a blocking signal to suppress individual clock pulses gives away. 4. Control device according to claim 3, characterized in that the signal sequence is set to a fixed program corresponding to a high volume of traffic and that the computer a number of depending on the decrease in the traffic volume supplies additional clock pulses to the counting gate (9). 50 control device according to claims 3 and *, characterized in that that the computer a constant number of clock pulses when the traffic increases at the counting gate (9) during the "green" phases in one or both directions of traffic suppressed. 6o control device according to one or more of the preceding claims, characterized in that a clock pulse repetition frequency of 1 Hz and decadic Counters (10, 11133) and timer switches (13, 18 to 21, 34, 35) are used 0 70 time selector switch according to one or more of the preceding claims, characterized by a monitoring device for switching on the "green" light a signal group comprising an AND gate (54) to which the green "signal the signal group to be switched to "Green'1" and a signal via an OR gate (53) (i5) for the failure of the "red" light in one of the enemy signal groups will4 L e r s e i t e