DE611533C - Circuit arrangement for a traffic signal system - Google Patents

Description

The main patent is a traffic signal system with periodically controlled from a central point, within a period different characters (e.g. green, yellow, red) announcing traffic signals., at which from the central office the Duration of the characters given in * a signal period without changing the duration of the period wterdieri can be changed at will.

xo In addition to an automatic control, this system also provides for individual traffic signal points independently of the rest in any way by the central office to control outgoing alternating currents of a certain frequency. The one described above The arrangement still has the shortcoming that the traffic lights, which are powered by alternating current Follow controlled traffic signal point in the. same or its corresponding Signal sequence are actuated, da'die adjusting the alternating current pulses on the control disks act that because of their cascade arrangement their adjustment. on the control disks assigned to the following traffic signal points. : _ - "

However, if the signaling means of a certain traffic signal point is operated differently from the automatic control, it is usually desirable to only remove this from the automatic rhythm, while all other traffic lights retain their previous signaling capabilities Disadvantage 'to) that a -changing- signal sequence from the central station from -zu ^: any

\ Time and "- so that any signal can occur at any time - this makes it possible that after the 'automatic' activation of the free drive, the blocking signal from the central office immediately or only after a brief warning is given 'is switched on by -the road safety in one

' inadmissible manner-is being avoided.

Educational genius becomes the improvement sought the traffic signal system according to the Main patent achieved by the fact that every traffic signal point '^ several of "one" frequency relay controlled Switching relay assigned

; are that ^ both "see each other and influence the traffic signal means in such a way that the-signal means assigned only to this traffic signal in a pre-determined sequence (J. B -: - GeItP, -Rot, Gelb, Green etc.) 'are actuated - by the fact that'

*) Fon the patent seeker have been given as the inventor: ι ■ .... '. ■■.

Theodor Bräuer in Berlin-Spandau ". ' and Väinö Holtnstin in Hohen Neuendoff near Berlin '.

the actuation of the traffic signal means which deviates from the automatic control by alternating currents of different frequency can only occur if a certain Signal, e.g. B. the yellow warning signal is given, the arrangement achieves according to the concept of the invention a far-reaching improvement in terms of road safety at the traffic points, ίο whose traffic lights differ from the automatic signal sequence is controlled.

As an exemplary embodiment of the concept of the invention, omitting all of these is not directly related in the figures Details of a traffic signal system have been shown in which several traffic signal points automatically from one Central office can be controlled from.

In Fig. Ι this automatic control has only been shown so far as to understand the essence of the inventive concept constituting frequency control, is necessary, while Fig. 2 shows a circuit arrangement for three signal lamps that are switched on both automatically and in deviation from the automatic signal sequence can be.

In Fig. Ι the central station Z has been indicated by dashed lines separated from the other switching means, which automatically opens and closes a contact if by a control disk vS * driven by a motor drive, whereby the individual traffic lights assigned to this central station are actuated in a predetermined signal sequence . In addition to the switching means for the automatic control nor a frequency machine PM is disposed in the central station, which by closing a certain Ta, T ste frequency alternating currents through a line wire and ground can transmit the individual traffic lights. In the same circuit a battery Ba is also provided, which a relay Zf ₁ can be operated when "the desired traffic light has changed its switching state according to the transmitted alternating current. The relay H is therefore used to report back that the transmitted signal has the desired success For visual display, a feedback lamp L is arranged in the central station, which is switched on by the contact h controlled by the ii relay.

In addition to these switching means assigned to the central point Z, FIG. 1 also shows the circuit arrangement for the traffic light denoted by VA _t , which is controlled, for example, directly from the central point. For the automatic control, the relay R is provided, which in the manner known from the main patent transmits the automatically given control currents in regular sequence to the motor drive assigned to this traffic signal point and thus to the traffic lights Lgr, Lge, Lro (Fig. 2). Since this automatic control does not directly affect the idea of the invention, the switching means required for this purpose have been omitted and only the contact k shown in its place, which applies the control pulses in the manner also known from the main patent. the next traffic signal point VA ₂ passes on. Of this traffic signal location is to the right, again separated by dashed lines from the rest of the switch gear, only the relay R corresponding! Control relay R 'represented, also in a manner not shown via the contact k' is communicated to it added Henden control impacts another traffic signal location.

For frequency control according to the inventive concept of the traffic signal location VA _t is a relay frequency F associated with the certain responsive only AC period number, and then, its normally closed contact f _x separates. It is of course possible that a working contact is closed when the frequency relay responds. However, practical tests have shown that reliable transmission of a control pulse is only guaranteed if the excitation alternating current is used to open the contact

The frequency relay is connected to the lower wire of the central point with the traffic light VA ₁ via the capacitor Ko . connected to the line so that with automatic traffic light control an additional direct current cannot flow via the lower wire and earth. Only when a parallel with the capacitor K <o arranged normally open contact e _t of being closed by the frequency relay overall _lo s controlled auxiliary relay E, the flow of a direct current is possible through the above-described communication path, so that the arranged in the control center if relays can respond . . . no

To operate the auxiliary relay E, apart from the opening of the relay controlled by the frequency relay F. Normally closed contact Z ₁ still necessary that the control disk Sge driven by the motor drive of this traffic signal separates the χι ₅ contact kge. Since the control disk assigned to the yellow warning sign only makes this contact opening when the yellow warning sign is given after the green sign as a transition to the red sign, the actuation of the frequency relay F can only be performed with regard to the

Traffic signal point VA _{1 will be} successful if the green free-travel sign has been automatically given in the prescribed length beforehand, so that an impermissible shortening of the free-travel sign is reliably prevented.

By switching off the .E relay, its Contacts shown in the position corresponding to the energized state of the relay

ίο have been, another relay G is actuated, which has such a drop-out delay that it is not actuated during the brief interruptions in the alternating control current to which the relays F and E respond. The G relay switches on the circuit arrangement consisting of the relays A Ms D via its ^ contact, by means of which a certain sequence of signal actuation is achieved while the frequency relay F is always excited the same and one after the other. These relays AD influence each other in such a way that they are actuated one after the other when the frequency relay F and thus the auxiliary relay B controlled by it repeatedly respond and drop out, and this successive actuation of the relays takes place in such a way that each switching relay is connected to a contact of the next Relay holds, its circuit being prepared by the first relay.

Of the four switching relays AD , the two relays B and D are used directly to control the signal lamps Lgr, Lge, Lr0 shown in FIG. Of these signal lamps, Lgr is assigned to the green traffic sign , Lge to the yellow warning sign and Lro to the red stop sign. In the manner already described in the main patent, these three lamps can be controlled alternately by the relays Rro, Rgr assigned to the characters red and green when the system is in normal operating condition, ie the G relay is de-energized and the contacts controlled by this relay taking g _s> GSS the position shown in FIG. 2. If the traffic light VA _{1 is} no longer to be controlled automatically, the contacts ^ ₃ , ^ ₄ are switched over by the G relay and the three signal lamps Lgr, Lge, Lro are activated instead of the relays Rgr, Rro, and the aforementioned two Switching relays B and D or their contacts b ₅ , d _{5 made} dependent.

The mode of operation of the above-described arrangement is as follows: If, for example, the traffic light VA _{1 is to be} removed from the automatic signal sequence as described in the main patent, an alternating current of a certain frequency is generated by pressing the key 71 ', which is generated by the frequency machine FM. is caused, transmitted via the lower wire of the "central point with the traffic light FA ₁ connecting line and earth of this traffic signal control.

Since the frequency relay F is tuned to this number of periods, it prepares the drop of the f relay _{via its contact / ±.} However, this relay is only de-energized when the control dial Sge assigned to the yellow warning sign, which is moved by a motorized drive depending on the control currents automatically transmitted to the traffic signal, opens the contact kge. This happens when the warning sign or the lamp Lge assigned to it is brought after the free travel sign green or the lamp Lgr assigned to this sign. With this signal, the circuit arrangement according to FIG. 2 is in the position shown there, namely in which both relays Rgr and Rro have dropped out, so that the lamps Lgr and Lro assigned to the characters green and red are short-circuited and only the warning lamp Lge is connected to the AC power source W is connected. The circuit for the yellow lamp Lge assigned to the warning sign is as follows: W, contact. Von Rgr, G ₄ , W ₆ , Lge, W ₅ , G ₃ , contact from Rro, W. In this circuit state, parallel to the two lamps Lgr , Lro arranged resistors W ₆ , Wc, are dimensioned in such a way that these lamps do not light up »

By opening the contact kge (Fig. 1) the relay E is thrown off, which by closing its contact e _t short-circuits the capacitor K0 , so that via the path (Ba ₁ T, H, lower wire of the connecting line, e _± , F , Earth, Ba) direct current can flow, whereby the relay H is actuated. By closing its contact h , the feedback lamp L is switched on, which indicates that pressing the button Γ and the resulting transmission of the frequency current has caused the desired switching state of the traffic signal VA ₁ .

Through contact e _2, the delay relay G is turned on by the. Ε relay laying once over its ^ -contact which consists of the relay AD circuitry at positive potential, and further by separating his ^ "contact the controlled from the control disc Sge contact makes kge for .Ε relay ineffective. by moving its change-over contacts g _3, consisting of the three lamps Lgr, LGE Lro existing signal arrangement of the relay Rgr and RRO and thus of the automatic control is gi made independent and therefor depending on the

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Contacts b & d ₅ or the relays B and D controlling them brought.

By actuating the E relay, the e _s contact has been switched over, so that the ^ .- relay responds (- , e ₃ , b ₇ , d ±, C ₃ , U ₁ , A, g _v ^), which is maintained via its own contact a _t depending on the changeover contact b ₂ assigned to the second relay B (- {-, g _v A, a _ly b _% , -). After the switching operations described, the warning lamp Lge (W, d ₅ , g ±, w _e , Lge, W ₅ , ^ ₃ , b ₅ , W :) lights up in the traffic signal VA ₁ until the brief opening of the Key T in the central station sends another signal, inevitably the one on the previously activated free clock; the following stop signals are given.

By opening the Γ button, the frequency relay F is briefly de-energized, which also briefly switches on the. The excitation of the .Ε relay does not last long enough - for that. through your ^ -contact the G-relay changes its switching state, because this relay is strongly delayed by the provision of short-circuit windings or a timer. . However, the energization time of the relay .Ε sufficient to turn · ₃ catalyst, the 5-relay on the e (- _z e d _it a _z, b _x, b, g _v - [-) extending via its ^ contact depending on the switching contact C _{2 of} the next relay C. The ^ .- relay, which had prepared the excitation circuit for the 5 relay via its ^ - contact, remains in the circuit even after the excitation of this relay (-J-, ^ ₁ , A, a ₁ , b ₂ , e _s , ^ -), so that the « ₃ contact is separated and the excitation of the C relay is prevented. -

After briefly opening the key T in the central station, the alternating current is switched on again via the above-described connection path, so that the F relay responds again, which throws off the £ relay via the / ^ - contact ^ jB relay, the ^ 4 relay is switched off because the # ₃ contact is placed in the upper position in which it is no longer in contact with the ^ relay _{due to the opening of the "normally closed contact &7"} .

The Z? Relay switches my contact & ₅ (Fig.2), whereby the previously switched on lamp ige, which is assigned to the warning sign, is short-circuited [w ₆ , g ±, b & ge, W ₅ ), furthermore Ider ^ .Short circuit of the lamp Lro assigned to the stop sign is canceled. In the traffic signal point, the stop signal is now switched on (Wdb) for as long as you like, until from. the control center Z by briefly opening the button T again, the next signal, namely again the attention signal, is switched on.

As a result of the missing frequency current when the button 7 ~ (Fig. 1) is opened, the frequency relay F is de-energized again, so that. The Ε relay is switched on again via the / y contact, which moves its e ₃ contact into the position shown in FIG. 1. "Since the a ₃ contact has now also been actuated", the C- Address the relay (- , G ₃ , b ±, a _s , C ₁ , C, g _1} +), which is maintained via its own contact C ₁ depending on the changeover contact d _{z of} the next and fourth relay D. By moving the Cg contact, the i? Relay is not yet thrown off, but is now also _{made dependent on the £ 3} contact (-j-, g _v B, b {, C ₂ , c _& , -), see above that by closing the button T and the excitation of the F-relay or the de-excitation of the £ relay, the U-relay is thrown off.

The .B relay puts his i ₅ -contact in the ■ - in Fig. .Location shown 2 back so that on the one hand ..the short-circuited to stop characters associated · lamp Lro, on the other hand, the short circuit of the attention mark unallocated lamp is canceled Lge . As a result, the warning lamp Lge now lights up in the traffic light VA ₁ (W, d ₆ , gi, w _e , Lge, W ₅ , g ₃ , b ₅ , W), 'until through' another brief actuator Button T in the central office Z another signal, inevitably, the free-travel sign is switched on by the lamp Lgr. '"

When the button T is opened briefly, the frequency relay F (FIG. 1) is de-excited and thus the. In this switch position, _{the ZMEtelais can receive power via the e 3} contact, since the ^ contact has been closed by the C relay (-, e $, C ₁ , b _a , d _u D, gi, +) · Das The Z> relay responds and maintains itself via "its ^ contact, depending on the changeover contact controlled by the first relay Λ _{" 2.} By switching the iZ ₄ contact, the D relay 'provides the circuit for the Ji relay which, however, cannot respond with the current switching state of the ^ contact because the c ₃ contact is still open. The relay C controlling this contact has been brought into dependence on the eg contact by moving the ng iZ _{2 contact} , so that by 'closing the key T in the central station and the resulting' excitation of the frequency relay F or the de- excitation of the auxiliary relay: E. the C-relay is thrown off, as this "s. Flip-over of the ej-contact of the

Holding circuit is interrupted via its own contact C ₁ and the changeover contact d ' _z.

When the D-relay is excited, flipping the i? ₅ contact, on the one hand, the lamp Lge assigned to the yellow warning sign is short-circuited, and on the other hand, the short-circuit of the lamp Lgr assigned to the green traffic sign is canceled, so that

ίο the green sign now lights up in the traffic signal point (W, _{Lgr, W 6} , g & dg, br ,, W), again until the next following, inevitably the warning signal, is switched on by briefly interrupting the T key. By briefly opening the key T , the frequency relay F is again de-excited and the U relay is switched on via the / ^ contact, which shifts its g ₃ contact to the position shown in FIG. Since on the one hand the contact <4 has been switched to the lower position by the excitation of the D relay, and on the other hand the C relay has been thrown off by the last switching processes, the Jl relay in the circuit (-, e ₃ , d ±, c _z , a _u A _t gi, +) address, which holds itself in the manner described above via its% contact and makes the D relay dependent on the changeover contact e ₃ by moving the a ^ contact. By closing the key T , the frequency relay F is again energized and the auxiliary relay E is thrown off, so that the e ₃ contact is switched to the upper position. As a result, the holding circuit for the D-relay has been separated via its own contact ^ ₁ and the reversed changeover _{contact A 2} , so that the D-relay returns to the rest position and by moving its <i _s contact back to that shown in FIG Position on the one hand short-circuits the lamp Lgr assigned to the free traffic sign green, on the other hand removes the previously existing short circuit for the lamp Lge assigned to the warning sign yellow '. Thus, after the completion of a period in which the stop and free travel signs were given one after the other separated by a short warning sign, the switching state assumed at the beginning of the relay arrangement assigned to the traffic signal VA _{1 is} reached, so that the further switching operations are the same as those in have been described above. Every time for a short time

When the T key is opened, the signal lamps Lro, Lge, Lgr, Lge etc. are operated one after the other, whereby the duration of the signal times can be determined as desired from the central station.

If the frequency control is to be terminated from the central station, the key T is opened for a longer period of time, so that the frequency relay! ^{7 is} switched off, the auxiliary relay £ is switched on. Since after a certain time amount, the G-relay as a result of the separated contact e ₂ drops, the existing from the relay AD circuit arrangement is separated off by opening the ^ -Kontaktes and by folding the Kontaktegg gt consisting of the lamps Lgr LGE and Lro existing signal arrangement instead of the contacts b ₅ , d ₅ or their relays B, D made dependent on the relay Rr0, Rgr causing the automatic signal sequence. In the manner already described in the main patent, the traffic signal point F ^ i ₁ is then assigned to the automatic switching sequence emanating from the central point.

Claims (4)

Patent claims: i. Circuit arrangement for a traffic signal system in which several signaling. set automatically from a control center in the same rhythm and individual signal points are optionally controlled by alternating currents of a certain frequency transmitted by the center independently of the other signal points in a different rhythm, according to patent 610 442, characterized in that each traffic signal point (VA ₁ ) has several of a frequency relay (F) controlled switching relays (AD) are assigned, which influence both each other and the traffic signal means (Lgr, Lge, Lro) in such a way that when the frequency relay is always actuated the same way, the signal means assigned to this traffic signal point one after the other in a predetermined order ( e.g. yellow, red, yellow, green etc.). 2. Circuit arrangement according to Claimi, characterized by switching means (Sge, kge) assigned to the traffic signal point, by means of which the actuation of the traffic signal means (Lgr, Lge , Lro), which deviates from the automatic control, by alternating current of different frequencies can only take place when a certain signal (e.g. . Yellow) is given.
_t 3. Circuit arrangement according to. Claim! 2, characterized by an auxiliary relay (E), the circuit of which is dependent both on the frequency relay (F) and on the contact disc (Sge) assigned to a specific signal (e.g. yellow). 4. Circuit arrangement according to Claimi, characterized in that the switching control controlled by the frequency relay (F) 610533 lais (AD) influence each other in such a way that they are actuated one after the other when the frequency relay responds and drops out. S-circuit arrangement according to Claim 4, characterized in that each switching relay (AD), after its actuation, is maintained via a contact of the next relay, the circuit of which is prepared by the first relay. For this purpose ι sheet of drawings