DE2350039A1 - ROAD COMMUNICATION SYSTEM - Google Patents

Description

The invention relates to a road traffic telecommunication system for the transmission of information signals, such as announcements to vehicles involved in traffic and are equipped with means for receiving such signals. Such systems are e.g. used to inform motorists about the state of the To teach road traffic in the direction of travel in front of them. The signals. ' however, you can also do this be used to perform a function in the vehicle itself, e.g. automatically imposing a predetermined maximum speed. What kind of Function or purpose of the information transmitted

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may also be, it will be called "message" in the following, which is the most common name in this area is.

The signal transmission takes place in general with the help of a radio transmitter that is set up next to the route in question, or with a low-frequency one inductive loop system that is built into the road surface. Below is under one "Transmitter" means both a radio transmitter with an antenna and a loop system, unless expressly stated otherwise stated.

! A vehicle passing by the transmitter The message receiver set up receives the message and forwards it in a functional form, e.g. as a visible or audible signal, or as a mechanical function. In general, the message receiver will contain two main stages, namely a signal receiver and a converter that converts the signal into functional form. For announcements, for example, there is the converter from a loudspeaker. There are two types of systems; in one system, the recipient is generally always on while the converter is turned on under the control of a transmitter signal; at the others the receiver and the converter are switched on at the same time. The former is on most often used. The method used in a certain case in the receiver to relay the signal

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in functional form is not relevant to the invention
of interest and therefore if below from
Turning on the receiver is talked about, including
understood that the receiver is switched in such a way that
that it forwards the message in a functional form, whereby it is unimportant whether the entire recipient or only a part of it is switched.

The invention relates in particular to the so-called device systems in which a vehicle traveling on a roadway in a certain direction does not receive a message intended for vehicles traveling in the opposite direction, except when such messages are for both directions of travel
are meant ..

Facility signaling is known in which a start signal transmitter followed by a message signal transmitter is set up next to the roadway. A message receiver mounted in a vehicle that passes the start signal transmitter is switched on by the start signal regardless of the direction of travel. The receiver then remains on under the control of timing circuitry long enough to receive a message broadcast by the message signal transmitter during the time the vehicle is passing the transmitter
receive. In this way, a message mounted in a vehicle that passes the start transmitter and the message signal transmitter in this order is

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Recipients forward the message in a functional form. In the case of a vehicle traveling in the opposite direction, it will pass the news channel before the message receiver has been switched on so that the message is not forwarded. With this system it is not possible to send two different messages with the help of two directly next to each other to transmit the set up news channel to vehicles passing in a certain direction, without receiving at least one of the messages from vehicles passing in the opposite direction will. This is not of great interest on lanes where the driveways and / or the exits far apart, but it is a serious limitation in such cases, in which this distance is small, e.g. in cities. This is the result of having to forward a Message of suitable duration each message transmitter a distance in the longitudinal direction of the web of about one Must cover kilometers. In the case where two exits are separated by one kilometer, you can it may be necessary to forward a certain message to vehicles before they reach the first exit, and Send another message to vehicles that want to leave the runway on the second exit. At the The aforementioned system must be close to each of the two message signal transmitters a start signal transmitter can be arranged.

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If the start signal transmitters affect vehicles moving in both directions, they will be in the opposite direction Vehicles moving in the direction of receiving one of the messages. That is why such systems the serious limitation on having the start signal and message signal transmitters so placed that they only affect the traffic passing in a certain direction. As a result, the system does not focus solely on the use of loop line type transmitters limited, but also for use on railways on which each direction has its own lane Has. In this way, the system cannot be applied to railways, however important. where the two directions are not separated by a median. When construction works on Lanes with separate lanes will have to be made usually the lane to be restored is blocked and traffic is diverted to the other lane, which actually for traffic in the opposite direction is determined. This strip is then called the roadway used for traffic in both directions. Under these circumstances, the above system cannot be used.

The invention aims to provide a road traffic telecommunication system to create that does not have the above disadvantages.

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A road traffic telecommunication system according to the invention for the selective forwarding of information to a vehicle depending on the The direction of travel of the vehicle on the relevant lane is indicated by a control signal transmitter, an information signal transmitter and a second control signal transmitter, which are three transmitters in the aforementioned Sequence are set up next to the roadway, and receivers set up in the vehicles for receiving of signals sent out by each of the transmitters, the receiver being transmitted by a first of one of the Control signal transmitter sent control signal is switched on for receiving a sent information signal and by a second from. other control signal transmitter transmitted control signal that differs from the first control signal differentiates, is switched off, whereby the receiver, after it is switched on by the first control signal, it remains switched on until the second control signal is turned off.

The signal transmitters can be of the loop line type or of the radio antenna type, but the advantages of the Systems according to the invention are only fully realized with the last-mentioned system, because it is there it is no longer necessary to limit the signals sent to only one direction of travel.

The receiver installed in a vehicle preferably includes an automatic squelch that

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the gain of the receiver in the absence of a signal sent by the information signal transmitter limited.

The invention is explained in more detail below with reference to the drawing. It shows:

1 shows a series of three according to the invention Transmitters and

Figs. 2 to 8 embodiments of the invention, with further transmitters in different ways are set up.

In the following description of the exemplary embodiments it is assumed in any case that the receiver after receiving a switching signal are switched on, 'to receive a message remain switched on until triggered by a switch-off signal turned off.

In FIG. 1, a section A, B of a path (not drawn to scale) indicated by double lines is divided by a dashed line into two lanes intended for the flow of traffic in the direction of AB and in the direction of BA Set up a series of transmitters, namely a control signal transmitter 1, an information signal transmitter 2 and a control signal transmitter 3. The transmission range encompassed by each transmitter is indicated schematically by dashed lines h ', 5 and 5. The transmitters can be of the loop line type, in which case the dashed lines h, 5 and 6 the loop

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lines, or of the antenna type, in which case the dashed lines represent those of the relevant Indicate areas covered by radio emissions. Both here and the following Embodiments can be the transmitters of both types, while if they are radio transmitters, they do not need to be set up next to the roadway, as shown in FIG. For example, they can also be set up in the median of the carriageway.

The control signal generators 7 and 8 generate

various first and second signals 9 and 10 respectively, the differ e.g. in frequency or pulse duration, or from several binary coded signals can exist. The signals 9 and 10 are coupled to one another switches 11 and 12, which are from a Control arrangement 13 are controlled, fed to the control signal transmitters 1 and 3, respectively.

An information signal transmitter 14 leads the information signal transmitter 2 information signals too. the Information can, for example, take the form of speech, either broadcast directly or recorded is, but it can also be a code series, e.g. a binary code.

It is assumed that a transmitted control signal 9 switches on a receiver installed in a vehicle driving through the transmission area h of the transmitter 1, ie for later reception

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of the information signal sent by the transmitter 2 (Message) is put into operation, and that a receiver passing area 6 of the control signal 10 is turned off. In the following, for the sake of simplicity, the control signals 9 and 10 are ON- and called OFF signals, while the associated transmitters are called ON and OFF transmitters.

It is assumed that the uppermost lane in the figure is for traffic in the Direction A-B and the lowest lane is intended for traffic in the opposite direction. In a moving vehicle is represented in each strip by a thin line 15 provided with an arrowhead, while the ON state of the recipient indicated by a thick line 16 and the receipt of a message by an ON receiver from one of the message reproducing hatched area 17 is indicated. In this way the receiver becomes one in the A-B direction moving vehicle switched on when passing the ON transmitter 1, receives while driving past the Sender 2 sends the message 17 and is then when passing of the OFF transmitter 3 is switched off by the OFF signal.

The receiver of a vehicle traveling in the direction B-A on the lowest lane becomes first switched on when the vehicle passes the transmission range of the ON transmitter 1. In this way one receives Vehicle traveling in direction B-A for in the

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Vehicles moving in the direction of A-B 17 not.

If the receiver of a vehicle traveling in the B-A direction is the one shown in FIG Leaves railway line A-B, it remains switched on. Therefore, the recipient is preferred with a squelch so that it is not available of a signal from an information signal transmitter is silent. For example, a • the message of the recipient modulated onto the radio frequency carrier in a known manner if it is not present of a carrier signal kept still, making noise and other interfering signals are not passed on by the receiver will.

If the receiver of a vehicle driving in the direction B-A is already switched on, that the vehicle has previously passed a railway section analogous to the railway line according to FIG. Transmitter 3 turned off before the vehicle entered the news coverage area happened.

If one wishes to selectively forward messages to vehicles traveling in the direction of B-A, then the coupled switches 11 and 12 from the control arrangement 13 is switched over so that the functions of the ON and OFF transmitters 1 and 3 are switched. Such a one The possibility of switching can be useful, but does not form an essential part of the invention.

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As already mentioned, the invention has System additional advantages if radio transmitters are held at least for control signal transmitters 1 and 3 Loop line transmitters can be used. The transmitters can then have an extremely low carrier power (e.g. a few milliwatts) and simple tone modulation. Such transmitters are known and cheap compared to the cost of equipment, installation and maintenance of loop systems. Same considerations regarding, the cost apply to the transmitter 2, which normally covers at least one kilometer of the railway line. One from a single Wire existing radiating supply line of this length is significantly cheaper than one in the roadway built-in loop line.

In an embodiment according to the invention can be any possible detriment caused by the recipient getting one in the direction of B-A moving vehicle after passing a railway line according to FIG. 1 in the switched-on state remains, by setting up an additional control signal transmitter 21 in the vicinity of the ON transmitter 1, such as reproduced in Fig. 2, can be avoided. In this figure, corresponding elements are given the same reference numerals as in FIG. 1, while only those Elements necessary for a good understanding of the mode of operation are reproduced. Incidentally, it becomes an ON transmitter

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with a circle with a cross and a AUS transmitter represented by a circle. This also applies to FIGS. 3 t> is 5 · Also in the Embodiments according to these figures set up the transmitter in the median of the train, but they can of course also be located at any other suitable location.

FIG. 2 shows how a message can be forwarded by adding the additional AUS transmitter 21 to a vehicle traveling in the direction A-B remains unmolested, while the recipient of one, on the other hand vehicle moving in the direction B-A immediately after it has been switched on by transmitter 1, from transmitter 21 is switched off again. Such a system is primarily useful for "relaying messages." to vehicles moving in a fixed direction, and it is of little use to enable switching of the transmitters, although this possibility can of course be created if necessary.

Fig. 3 shows an expansion of the system according to FIG the other direction or to vehicles moving in both directions with the help of an additional control signal transmitter 23 can be forwarded selectively. In this embodiment the transmitters are 21 and 23 both OFF transmitters that are not switched while transmitters 1 and 3 can be switched. It will

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be clear, that if the transmitters 1 and 3 have an ON or an OUT transmitter, as also shown in the drawing, are the message transmission circumstances according to FIG. 2 apply. By changing the functions of these transmitters, messages can be sent to the Vehicles moving in the direction of B-A are selectively forwarded. Next can if the transmitter 1 and 3 both Send ON signals, the same message to all vehicles, regardless of their direction of travel.

It will be clear that each of the systems shown in Figures 1 to 3 enables Successive · Forward messages to vehicles by placing systems of the same type close together are set up, thus making the exit and lanes close together Conditions provided are met,

FIG. 4 shows two systems of the type according to FIG. 1 in closely spaced rows, in which the suffix ia is added to the reference numbers of the second system. The figure shows the reactions of the recipients of two vehicles 41 and 42, with vehicle 41 leaving the path at exit 43 ′ and vehicle 42 leaving the path at exit 44. In this way, separate messages for. a specific exit applies to those turning into the exits

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Traffic are forwarded. Here, too, no message is sent to vehicles traveling in the direction B-A forwarded.

*. If you send separate messages in opposite directions Want to forward moving vehicles, according to a further embodiment of the invention, which is shown in FIG. 5, a rail section which is adjacent to the rail line according to FIG. 1 be used. An additional message signal transmitter 51 and an additional control signal transmitter 52 are set up one behind the other next to the track, and so that the two news channels 2 and 51 take turns with the three control signal transmitters 3 »1 and are set up as shown. The transmitter is an ON signal transmitter and transmitters 3 and 52 are OFF — signal transmitter. In this way one receives in the Vehicle traveling in direction B-A only receives message 53 from transmitter 51 'while a vehicle traveling in direction A-B Vehicle only receives the message from transmitter 2. In this embodiment, not a single one remains Vehicle receiver in the ON state when leaving the in the path sections shown in the figure, since each receiver passes an OFF signal transmitter last.

It will be clear that more complex systems are involved using the systems shown in the various figures shown basics for expanding the basic system, both with and without switching for the Direction of travel choice, can be constructed.

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The system according to the invention can be used in further embodiments in which separate messages are selectively forwarded to vehicles passing in both directions by using different ON signals. An embodiment of such a system is shown in FIG. 6, in which the transmitters 1, 2 and 3 are identical to those according to FIG. 1, while additional control signal transmitters 61 and 62 are added. In this embodiment, the ON signals also serve to tune the receiver to a specific communication channel, namely the ON signal sent by the control signal transmitter 1 tunes the receivers of all vehicles to the communication channel 1, while the ON signal sent by the control signal transmitter 61 the Recipients of all vehicles tunes to the message channel 2. The control signal transmitters 3 and 62 ″ emit the same OFF signal, which switches off all receivers, regardless of which channel they are tuned to same third frequency emit. In this case, each receiver includes selectively tuned filter circuits, for the various control signal frequencies ₉ and detecting a control signal .hat the desired switching to sequence _a another possibility is that the control signals aufweisenj the form of binary coded signals the Z ₀ B. after the delta modulation

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system.

The message signal transmitter 2 sends separate messages for the directions of travel AB and BA on separate channels, for example by using carriers with different frequencies. In the case of a vehicle traveling in the direction AB, the receiver is tuned by the ON signal originating from the control signal transmitter T so that the vehicle receives the first message 6j via channel 1. The message signal transmitted via the first communication channel is then received by the receiver from the transmitter 2, after which the receiver is switched from the transmitter 61 to the second communication channel and then switched off almost immediately afterwards by the OFF signal transmitter 3. For the time in which the receiver is tuned to the second message channel, no message is received because the vehicle is outside the transmission range of the message transmitter 2.

The same process takes place for vehicles traveling in the direction BA, except that in this case the ON signal transmitter 61 switches the receiver in such a way that it can receive the message 6h sent by the message transmitter 2 via the second communication channel. Such a system offers all the possibilities that may be desirable in a complicated road traffic telecommunication system, because systems analogous to the system according to FIG

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Sections can be set up.

In the foregoing embodiments, For the sake of clarity, it has already been assumed that all transmitters cover the full width of the lane, so that Vehicles traveling in both directions receive at least the ON and OFF control signals regardless Strip on which they are located. However, it should be remembered that the system according to the invention is exactly the same Can be used well: if certain strips of the road are always intended for driving in only one direction Traffic are determined, as is the case with so-called motorways, with the two strips for one specific each Direction of travel through a guardrail from each other

• are separated. In this case, the ON and OFF control signal need transmitters have only transmission ranges _s include the corresponding strips. An example of this is shown in FIG. 7, which shows three systems according to the invention which are set up next to a roadway. The ON, message and OFF transmitters are again indicated with 1, 2 and 3, respectively, whereby the three systems differ by adding an a, b and c after the digits. It is assumed that the carriageway is divided into two separate lanes by a guardrail.

The receiver of one traveling in the direction A-B

-Vehicle is switched on by the ON transmitter la, receives then a first message from the message sender 2a,

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is then switched off by the OFF transmitter 3a, then turned on again by the ON transmitter 1b, receives then a second message from the message transmitter 2b and is finally switched off again by the OFF transmitter 3b.

The receiver of a vehicle traveling in the direction B-A is switched on by the ON transmitter 1c are then received a message from the transmitter 2c and switched off by the OFF transmitter 3c.

The six control signal transmitters are drawn in the different strips to indicate that their transmission range only covers the relevant strip. You can of course also in the median 71 be set up and directional properties have so that their broadcasts are only relevant to that Affect driving tires. The news channels 2a, 2b and 2c can be designed in such a way that they have both strips or only the relevant strip include. It should be noted that in contrast to the system according to FIG All receivers are switched off during the path section.

FIG. 8 shows an extension of the system shown in FIG. 7, in which two separate Transmission channels are used for both directions of traffic. In this embodiment, for each of the a different ON signal on both communication channels

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.used, whereby these ON signals switch the receivers to * the correct channel for the relevant direction. The circles that indicate the IN transmitters contain digits that indicate the message channel (1 or 2) to which the receivers are switched * In this way, all receivers passing through the IN transmitters in the direction AB are switched so that they receive the channel 1 via the transmitter systems a_ and b_, while all receivers passing in the direction BA are switched in such a way that they receive den.Kanal 2 via the transmitter sy stars c_ and d ^. The communication transmitter 2c is used for the two transmitter systems b_ and c_ and sends separate messages on both channels simultaneously, different messages being received by vehicles traveling in both directions on the same railway line AB. The empfange- from the receivers _# NEN message channels are divided by the corresponding channel numbers (1 and 2) in the hatched message the figure given.

From the above advantages, it will be clear that by using an ON signal transmitter on one side of the message signal transmitter and an OFF signal transmitter on the other side of the message signal transmitter according to the invention particularly complicated telecommunication systems in roads with close together lying exits and driveways can be attached without the chance of being in any particular Vehicles traveling in the direction of certain messages from vehicles traveling in the opposite direction on the lane Vehicles can be received.

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Claims (4)

-20-, PHB. 32282 PATENT CLAIMS: (1 J road traffic reporting system for selective Forwarding of information to a vehicle depending on its direction of travel on the relevant vehicle Lane marked by a control signal transmitter, an information signal transmitter and a further control signal transmitter, which three transmitters placed one behind the other in this order next to the road are, as well as receivers arranged in vehicles for the reception of Signaleiij sent by each transmitter wherein a first control signal, which one of the control signal transmitters transmits, the receiver for receiving of a transmitted information signal turns on, while a second control signal that the other control signal transmitter sends out and differs from the first control signal, the receiver switches off, the Receiver after being switched on by the first control signal, remains switched on until it is switched on by the second Control signal is switched off, 2. System according to claim 1, characterized in that each receiver is provided with a squelch, in the absence of one from the information signal transmitter broadcast signal prevents the receiver appeals to. 3. System according to claim 1, characterized in that the frequencies of the two control signals differ. 409816/0870 -21- PH3. 3 ^ 282 k. System according to Claim 1, characterized in that arrangements for generating the first and second control signals and circuit arrangements for applying the first and second control signals to a first control signal transmitter or to the further control signal transmitter and vice versa are provided. 5. System according to claim 1, characterized in that that it contains an additional control signal transmitter, which is set up next to one of the control signal transmitters mentioned is. 6. System according to claim 5 »characterized in that it contains a further additional control signal transmitter which is set up next to the other of the control signal transmitters mentioned. 7. System according to claim 1, characterized in that that it contains a further information signal transmitter and an additional control signal transmitter, which in addition to the Roadway are set up that each information signal transmitter is arranged between two control signal transmitters. 8. System according to one or more of the preceding claims, characterized in that the information signal transmitter it is designed in such a way that it has two pieces of information can send out signals, each in a separate. Transmission channel lie, said first control signal is one or the other of two different control signals which, when received by the receiver, serve to to switch them in such a way that they receive the corresponding transmission channel. 4 0 981 6 / 0-8 7 o Blank page