EP0521846A1 - Wireless display system for vehicles - Google Patents

Wireless display system for vehicles Download PDF

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Publication number
EP0521846A1
EP0521846A1 EP92890163A EP92890163A EP0521846A1 EP 0521846 A1 EP0521846 A1 EP 0521846A1 EP 92890163 A EP92890163 A EP 92890163A EP 92890163 A EP92890163 A EP 92890163A EP 0521846 A1 EP0521846 A1 EP 0521846A1
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EP
European Patent Office
Prior art keywords
transmitters
receivers
traffic
receiver
vehicle
Prior art date
Legal status (The legal status 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 status listed.)
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Application number
EP92890163A
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German (de)
French (fr)
Inventor
Manfred Hötzl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Roto Frank Eisenwarenfabrik AG
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Roto Frank Eisenwarenfabrik AG
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Publication date
Application filed by Roto Frank Eisenwarenfabrik AG filed Critical Roto Frank Eisenwarenfabrik AG
Publication of EP0521846A1 publication Critical patent/EP0521846A1/en
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096708—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control
    • G08G1/096716—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control where the received information does not generate an automatic action on the vehicle control
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096733—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place
    • G08G1/09675—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place where a selection from the received information takes place in the vehicle
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096783—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a roadside individual element

Definitions

  • the invention relates to a wireless display system for vehicles, in particular motor vehicles, in traffic regulated by means of traffic signs, in particular road traffic, wherein on the road side, traffic signs, transmitters and receivers are provided in the vehicles for receiving information.
  • inductive train controls are known through which the track signals act directly on the locomotive.
  • Traffic control systems are known in which street-side transmitters emit information from a control center about route routing and traffic density and vehicle-side receivers selectively record this information after preprogramming and display it in the vehicle at the appropriate time.
  • radio remote controls are known which are arranged in emergency vehicles and which act on traffic lights. As a result, an emergency vehicle can foresee a path ahead on a route to a site.
  • the invention aims to make traffic signs visible in the vehicle over the entire path of its scope. This is achieved in that the transmitters emit an identifier specific to the respective traffic sign, in that the receiver or receivers in the vehicle have a switch for selectively detecting the identifier and a display device for traffic sign symbols for displaying the traffic signs corresponding to the identifier is connected downstream in the area of validity thereof.
  • a transmitter on the side of the road activates a receiver in the vehicle as it drives past, which, depending on the frequency or coding determined, has a corresponding light field on the basis of a comparison with the content of a receiver-side memory switches on the dashboard or selects the display of the traffic sign on a display panel.
  • IR range Due to the directivity of certain wave ranges, such as the IR range, corresponding to a light signal, only the road users approaching a traffic sign or the receivers of the corresponding vehicles are addressed. The transmission signal is not recognizable for oncoming vehicles.
  • a transmitter eg IR transmitter
  • infrared transmitters and receivers are provided and the direction of radiation and reception can be limited to one direction of travel and shielded from receivers of oncoming vehicles, for example by means of cylindrical screens.
  • special measures must be taken to switch the display of traffic signs in the vehicle only to the direction of travel. Traffic signs intended for oncoming vehicles may not be displayed.
  • the transmitters and receivers are designed as high-frequency transmitters and receivers, that each transmitter of a traffic sign is preceded by another transmitter at a distance and that in the vehicle at least one receiver for the frequency assigned to a traffic sign and another receiver for the signal of the
  • the aforementioned further transmitter is provided and the latter receiver is assigned a switching device for switching on the first receiver.
  • At least two transmitters are provided at intervals from one another, each with at least one signal that can be detected by the receiver, and if the receivers have a circuit for detecting the sequence of the maximum values of the signals recorded and a comparison circuit for comparison with a stored sequence of signals and a circuit for switching through a received traffic sign identifier to the display device if the received matches the one or one of the stored sequences.
  • FIG. 1 An embodiment of the system according to the invention is shown schematically in the drawing in the form of a block diagram.
  • the figure shows on the right a traffic sign 1 with a speed limit and at some distance a traffic sign 2 with the end of the speed limit.
  • Each of these traffic signs has a transmitter 3, 4 with the correspondingly tuned antenna 5, 6. If frequency ranges are used that do not allow directivity and shielding in the opposite direction, then each of the traffic signs is preceded by a transmitter 7, 8 in spatial distance. While the transmitters 7, 8 only emit a switching signal f 1 or f 2, the signal f i , f k of the transmitters 3 and 4 each corresponds to the individual traffic sign, that is to say an example of the speed limitation to 70 km / h.
  • a vehicle 10 includes a receiver 11 for f 1, which, when receiving f 1 with a signal strength above a predetermined threshold, actuates a switch 12 and switches on a receiver 13 for f i . As soon as the latter detects a signal f i with a signal strength above an adjustable threshold, the specific received signal and the associated traffic sign are determined in a comparison with stored signals f i and selectively displayed on a screen or by means of a lamp 14, 15, 16. The display remains until the switch-off command comes.
  • a receiver 17 set to the frequency f 2 switches a receiver 19 to reception by means of a switch 18.
  • a deletion command is issued via the output 20 to the indicator light 14 or 15, 16, etc.
  • An oncoming vehicle does not respond to traffic signs 1 and 2 because the signals are out of order f1, f i , f2, f k are included.
  • the oncoming vehicle arrives in the area of f k for the time being, but does not detect this traffic sign because the vehicle-side receiver 19 is not switched on in the absence of a preceding signal f 2. This also applies to the receiver 13 with respect to the signal f 1, which thus also does not respond.
  • a circuit arrangement for direction detection is essential so that only the traffic signs intended for the direction of travel are displayed in the vehicle. This direction-recognizing circuit arrangement is omitted only in the case of wireless information carriers which can be clearly aligned and shielded from oncoming vehicles.

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  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)

Abstract

In order to display traffic signs in a vehicle (10) for as long as the vehicle is located in the range of application of a traffic sign (1, 2), transmitters (3, 4) are assigned to the traffic signs and receivers are assigned to the vehicles (10), the said receivers switching on or off, in accordance with a received code, a display (14, 15, 16) in the vehicle which represents the traffic sign (1, 2). The infrared transmitters are directed counter to the direction of travel and shielded with respect to the opposite direction of travel. The receivers have an analogous shielding so that they only receive the signals intended for the direction of travel. Radio-frequency transmitters (3, 4) which can be used as an alternative on the traffic signs (1, 2) have additional transmitters (7, 8) which are positioned at a distance in front of the traffic sign transmitters (3, 4). The vehicle-side receivers (11, 17) only switch the traffic sign signal to the display (14, 15, 16) if the series of received frequencies is adhered to. <IMAGE>

Description

Die Erfindung betrifft ein drahtloses Anzeigesystem für Fahrzeuge, insbesondere Kraftfahrzeuge, in einem mittels Verkehrszeichen geregelten Verkehr, insbesondere Straßenverkehr, wobei straßenseitig an Verkehrszeichen, Sender und in den Fahrzeugen Empfänger zur Informationsaufnahme vorgesehen sind.The invention relates to a wireless display system for vehicles, in particular motor vehicles, in traffic regulated by means of traffic signs, in particular road traffic, wherein on the road side, traffic signs, transmitters and receivers are provided in the vehicles for receiving information.

Fahrzeuglenker übersehen infolge einer Ablenkung durch die zunehmend schwieriger werdenden Verkehrssituationen sehr häufig Verkehrszeichen und gefährden dadurch sich selbst, aber auch andere Verkehrsteilnehmer. Häufig tritt der Fall ein, daß man als Lenker unsicher ist, ob man sich noch im Bereich einer Geschwindigkeitsbeschränkung oder eines Überholverbotes befindet.Vehicle drivers very often overlook traffic signs due to a distraction due to the increasingly difficult traffic situations and thereby endanger themselves as well as other road users. It often happens that you are unsure as a driver whether you are still in the area of a speed limit or an overtaking ban.

Im Eisenbahnwesen sind induktive Zugsteuerungen bekannt, durch welche die Streckensignale unmittelbar auf die Lokomotive einwirken. Es sind Verkehrsleitsysteme bekannt, bei welchen straßenseitige Sender Informationen einer Leitzentrale über Streckenführung und Verkehrsdichte abstrahlen und fahrzeugseitige Empfänger nach einer Vorprogrammierung diese Informationen selektiv aufnehmen und im Fahrzeug zum entsprechenden Zeitpunkt zur Anzeige bringen. Ferner sind Funkfernsteuerungen bekannt, die in Einsatzfahrzeugen angeordnet sind und die auf Verkehrsampeln einwirken. Dadurch kann sich vorausschauend auf einer Strecke zu einem Einsatzort ein Einsatzfahrzeug freie Bahn schaffen.In the railroad sector, inductive train controls are known through which the track signals act directly on the locomotive. Traffic control systems are known in which street-side transmitters emit information from a control center about route routing and traffic density and vehicle-side receivers selectively record this information after preprogramming and display it in the vehicle at the appropriate time. Furthermore, radio remote controls are known which are arranged in emergency vehicles and which act on traffic lights. As a result, an emergency vehicle can foresee a path ahead on a route to a site.

Die Erfindung zielt darauf ab, Verkehrszeichen im Fahrzeug über den gesamten Weg ihres Gültigkeitsbereiches sichtbar zu machen. Dies wird dadurch erreicht, daß die Sender eine für das jeweilige Verkehrszeichen spezifische Kennung ausstrahlen, daß der oder die Empfänger im Fahrzeug eine Schalterung zur selektiven Erfassung der Kennung aufweisen und eine Anzeigevorrichtung für Verkehrszeichensymbole zur Anzeige der der Kennung entsprechenden Verkehrszeichen im Gültigkeitsbereich derselben nachgeschaltet ist. Ein Sender am Straßenrand aktiviert im Fahrzeug beim Vorbeifahren also einen Empfänger, der je nach der festgestellten Frequenz oder Codierung aufgrund eines Vergleichs mit dem Inhalt eines empfängerseitigen Speichers ein entsprechendes Leuchtfeld auf dem Armaturenbrett einschaltet oder die Darstellung des Verkehrszeichens auf einem Anzeigefeld selektiert. Durch die einem Lichtsignal entsprechende Richtwirkung gewisser Wellenbereiche, wie z.b. des IR-Bereiches, werden nur die auf ein Verkehrszeichen zufahrenden Verkehrsteilnehmer bzw. die Empfänger der entsprechenden Fahrzeuge angesprochen. Für entgegenkommende Fahrzeuge ist das Sendesignal nicht erkennbar. Bei Erreichen des Endes des Gültigkeitsbereiches ist neuerlich ein Sender (z.b. IR-Sender) vorgesehen, der die optische Anzeige im Fahrzeug löscht. In diesem Sinne ist es zweckmäßig, wenn Infrarot-Sender und Empfänger vorgesehen und die Abstrahl- und Empfangsrichtung auf eine Fahrtrichtung begrenzbar und gegenüber Empfängern entgegenkommender Fahrzeuge, beispielsweise durch zylindrische Blenden, abschirmbar sind. Im HF-Bereich müssen spezielle Maßnahmen getroffen werden, um die Anzeige der Vekehrszeichen im Fahrzeug nur auf die Fahrtrichtung abzustellen. Verkehrszeichen, die für die entgegenkommenden Fahrzeuge bestimmt sind, dürfen nicht angezeigt werden. Dies wird dadurch erreicht, daß die Sender und Empfänger als Hochfrequenzsender und Empfänger ausgebildet sind, daß jedem Sender eines Verkehrszeichens ein weiterer Sender im Abstand vorgelagert ist und daß im Fahrzeug mindestens ein Empfänger für die einem Verkehrszeichen zugeordnete Frequenz und ein weiterer Empfänger für das Signal des vorgenannten weiteren Senders vorgesehen und dem letztgenannten Empfänger eine Schalteinrichtung zum Einschalten des erstgenannten Empfängers zugeordnet ist. Insbesondere ist es zweckmäßig, wenn in Abständen zueinander mindestens zwei Sender mit je mindestens einem empfängerseitig erfaßbaren Signal vorgesehen sind und wenn die Empfänger eine Schaltung zur Erfassung der Reihenfolge der aufgenommenen Maximalwerte der Signale und eine Vergleichsschaltung zum Vergleich mit einer abgespeicherten Folge von Signalen sowie eine Schaltung zum Durchschalten einer empfangenen Verkehrszeichenkennung an die Anzeigevorrichtung bei Übereinstimmung der empfangenen mit der oder einer der abgespeicherten Folgen aufweisen.The invention aims to make traffic signs visible in the vehicle over the entire path of its scope. This is achieved in that the transmitters emit an identifier specific to the respective traffic sign, in that the receiver or receivers in the vehicle have a switch for selectively detecting the identifier and a display device for traffic sign symbols for displaying the traffic signs corresponding to the identifier is connected downstream in the area of validity thereof. A transmitter on the side of the road activates a receiver in the vehicle as it drives past, which, depending on the frequency or coding determined, has a corresponding light field on the basis of a comparison with the content of a receiver-side memory switches on the dashboard or selects the display of the traffic sign on a display panel. Due to the directivity of certain wave ranges, such as the IR range, corresponding to a light signal, only the road users approaching a traffic sign or the receivers of the corresponding vehicles are addressed. The transmission signal is not recognizable for oncoming vehicles. When the end of the validity range is reached, a transmitter (eg IR transmitter) is again provided which clears the visual display in the vehicle. In this sense, it is expedient if infrared transmitters and receivers are provided and the direction of radiation and reception can be limited to one direction of travel and shielded from receivers of oncoming vehicles, for example by means of cylindrical screens. In the HF range, special measures must be taken to switch the display of traffic signs in the vehicle only to the direction of travel. Traffic signs intended for oncoming vehicles may not be displayed. This is achieved in that the transmitters and receivers are designed as high-frequency transmitters and receivers, that each transmitter of a traffic sign is preceded by another transmitter at a distance and that in the vehicle at least one receiver for the frequency assigned to a traffic sign and another receiver for the signal of the The aforementioned further transmitter is provided and the latter receiver is assigned a switching device for switching on the first receiver. In particular, it is expedient if at least two transmitters are provided at intervals from one another, each with at least one signal that can be detected by the receiver, and if the receivers have a circuit for detecting the sequence of the maximum values of the signals recorded and a comparison circuit for comparison with a stored sequence of signals and a circuit for switching through a received traffic sign identifier to the display device if the received matches the one or one of the stored sequences.

Ein Ausführungsbeispiel des erfindungsgemäßen Systems ist in der Zeichnung in Form eines Blockschaltbildes schematisch dargestellt. Die Figur zeigt rechts ein Verkehrszeichen 1 mit einer Geschwindigkeitsbeschränkung und in einiger Entfernung ein Verkehrszeichen 2 mit dem Ende der Geschwindigkeitsbeschränkung. Jedes dieser Verkehrszeichen verfügt über einen Sender 3, 4 mit der entsprechend abgestimmten Antenne 5, 6. Werden Frequenzbereiche verwendet, die keine Richtwirkung und Abschirmung in der Gegenrichtung zulassen, dann ist jedem der Verkehrszeichen ein Sender 7, 8 in räumlicher Distanz etwas vorgelagert. Während die Sender 7, 8 lediglich ein Schaltsignal f₁ bzw. f₂ abstrahlen, entspritcht das Signal fi, fk der Sender 3 und 4 jeweils dem individuellen Verkehrszeichen, also ein Beispiel der Geschwindigkeitsbeschränkung auf 70 km/h.An embodiment of the system according to the invention is shown schematically in the drawing in the form of a block diagram. The figure shows on the right a traffic sign 1 with a speed limit and at some distance a traffic sign 2 with the end of the speed limit. Each of these traffic signs has a transmitter 3, 4 with the correspondingly tuned antenna 5, 6. If frequency ranges are used that do not allow directivity and shielding in the opposite direction, then each of the traffic signs is preceded by a transmitter 7, 8 in spatial distance. While the transmitters 7, 8 only emit a switching signal f 1 or f 2, the signal f i , f k of the transmitters 3 and 4 each corresponds to the individual traffic sign, that is to say an example of the speed limitation to 70 km / h.

Ein Fahrzeug 10 umfaßt einen Empfänger 11 für f₁, der bei Empfang von f₁ mit einer über einer vorgegebenen Schwelle liegenden Signalstärke einen Schalter 12 betätigt und einen Empfänger 13 für fi einschaltet. Sobald dieser ein Signal fi mit einer über einer einstellbaren Schwelle liegende Signalstärke feststellt, wird in einem Vergleich mit eingespeicherten Signalen fi das konkrete empfangene Signal und das dazugehörede Verkehrszeichen ermittelt und selektiv auf einem Bildschirm oder mittels einer Leuchte 14, 15, 16 angezeigt. Die Anzeige bleibt stehen, bis der Ausschaltbefehl kommt.A vehicle 10 includes a receiver 11 for f 1, which, when receiving f 1 with a signal strength above a predetermined threshold, actuates a switch 12 and switches on a receiver 13 for f i . As soon as the latter detects a signal f i with a signal strength above an adjustable threshold, the specific received signal and the associated traffic sign are determined in a comparison with stored signals f i and selectively displayed on a screen or by means of a lamp 14, 15, 16. The display remains until the switch-off command comes.

Nähert sich das Fahrzeug dem Verkehrszeichen 2 (Ende der Geschwindigkeitsbeschränkung), dann schaltet ein auf die Frequenz f₂ eingestellter Empfänger 17 mittels eines Schalters 18 einen Empfänger 19 auf Empfang. Sobald der Empfänger eines der Signale fk feststellt, die einem Ende eines Wirkungsbereichs eines bestimmten Verkehrszeichens entsprechen, erfolgt ein Löschungsbefehl über den Ausgang 20 an die Anzeigenleuchte 14 bzw. 15, 16 usw.If the vehicle approaches the traffic sign 2 (end of the speed limit), then a receiver 17 set to the frequency f 2 switches a receiver 19 to reception by means of a switch 18. As soon as the receiver detects one of the signals f k that correspond to an end of an effective range of a specific traffic sign, a deletion command is issued via the output 20 to the indicator light 14 or 15, 16, etc.

Ein entgegenkommendes Fahrzeug reagiert auf die Verkehrszeichen 1 und 2 nicht, weil die Signale nicht in der Reihenfolge f₁, fi, f₂, fk aufgenommen werden. Das entgegenkommende Fahrzeug gelangt vorerst in den bereich von fk, stellt dieses Verkehrszeichen aber nicht fest, weil der fahrzeugseitige Empfänger 19 mangels eines vorausgehenden Signals f₂ nicht eingeschaltet ist. Dies gilt auch für den Empfänger 13 bezüglich des Signals f₁, der somit ebenfalls nicht reagiert. Wesentlich ist eine Schaltungsanordnung zur Richtungserkennung, damit nur die für die Fahrtrichtung bestimmten Verkehrszeichen im Fahrzeug angezeigt werden. Lediglich bei drahtlosen Informationsträgern, die eine klar ausgerichtet und gegenüber entgegenkommenden Fahrzeugen abgeschirmt werden können, entfällt diese richtungserkennende Schaltungsanordnung.An oncoming vehicle does not respond to traffic signs 1 and 2 because the signals are out of order f₁, f i , f₂, f k are included. The oncoming vehicle arrives in the area of f k for the time being, but does not detect this traffic sign because the vehicle-side receiver 19 is not switched on in the absence of a preceding signal f 2. This also applies to the receiver 13 with respect to the signal f 1, which thus also does not respond. A circuit arrangement for direction detection is essential so that only the traffic signs intended for the direction of travel are displayed in the vehicle. This direction-recognizing circuit arrangement is omitted only in the case of wireless information carriers which can be clearly aligned and shielded from oncoming vehicles.

Claims (4)

Drahtloses Anzeigesystem für Fahrzeuge, insbesondere Kraftfahrzeuge, in einem mittels Verkehrszeichen geregelten Verkehr, insbesondere Straßenverkehr, wobei straßenseitig an Verkehrszeichen, Sender"und in den Fahrzeugen Empfänger zur Informationsaufnahme vorgesehen sind, dadurch gekennzeichnet, daß die Sender (3,4) eine für das jeweilige Verkehrszeichen (1, 2) spezifische Kennung (fi, fk) ausstrahlen, daß der oder die Empfänger (13, 19) im Fahrzeug (10) eine Schalterung zur selektiven Erfassung der Kennung aufweisen und eine Anzeigevorrichtung (14, 15, 16) für Verkehrszeichensymbole zur Anzeige der der Kennung entsprechenden Verkehrszeichen im Gültigkeitsbereich derselben nachgeschaltet ist.Wireless display system for vehicles, in particular motor vehicles, in traffic regulated by means of traffic signs, in particular road traffic, on the street side of traffic signs, transmitters "and in the vehicles receivers for receiving information being provided, characterized in that the transmitters (3, 4) are provided for each Traffic signs (1, 2) emit a specific identifier (f i , f k ) that the receiver (s) (13, 19) in the vehicle (10) have a switch for selectively detecting the identifier and a display device (14, 15, 16) for traffic sign symbols for displaying the traffic signs corresponding to the identifier in the area of validity thereof. Drahtloses Anzeigesystem nach Anspruch 1, dadurch gekennzeichnet, daß Infrarot-Sender und Empfänger vorgesehen und die Abstrahl- und Empfangsrichtung auf eine Fahrtrichtung begrenzbar und gegenüber Empfängern entgegenkommender Fahrzeuge, beispielsweise durch zylindrische Blenden, abschirmbar sind.Wireless display system according to Claim 1, characterized in that infrared transmitters and receivers are provided and the direction of radiation and reception can be limited to one direction of travel and can be shielded from receivers of oncoming vehicles, for example by means of cylindrical screens. Drahtloses Anzeigesystem nach Anspruch 1, dadurch gekennzeichnet, daß die Sender (3, 4) und Empfänger (13, 19) als Hochfrequenzsender und Empfänger ausgebildet sind, daß jedem Sender (3, 4) eines Verkehrszeichens ein weiterer Sender (7, 8) im Abstand vorgelagert ist und daß im Fahrzeug mindestens ein Empfänger (14, 19) für die einem Verkehrszeichen zugeordnete Frequenz (fi, fk) und ein weiterer Empfänger (11, 17) für das Signal (f₁, f₂) des vorgenannten weiteren Senders (7, 8) vorgesehen und dem letztgenannten Empfänger (11, 17) eine Schalteinrichtung zum Einschalten des erstgenannten Empfängers (13, 19) zugeordnet ist.Wireless display system according to Claim 1, characterized in that the transmitters (3, 4) and receivers (13, 19) are designed as high-frequency transmitters and receivers, that each transmitter (3, 4) of a traffic sign has a further transmitter (7, 8) in the Distance is upstream and that in the vehicle at least one receiver (14, 19) for the frequency assigned to a traffic sign (f i , f k ) and another receiver (11, 17) for the signal (f₁, f₂) of the aforementioned further Transmitter (7, 8) is provided and a switching device for switching on the first-mentioned receiver (13, 19) is assigned to the latter receiver (11, 17). Drahtloses Anzeigesystem nach Anspruch 1, dadurch gekennzeichnet, daß in Abständen zueinander mindestens zwei Sender (7, 3) mit je mindestens einem empfängerseitig erfaßbarem Signal (f₁, fi) vorgesehen sind, und daß die Empfänger (11, 13) eine Schaltung zur Erfassung der Reihenfolge der aufgenommenen Maximalwerte der Signale (f₁, f₂) und eine Vergleichsschaltung (21) zum Vergleich mit einer abgespeicherten Folge von Signalen (z.B. f₁, fi, f₂, fk) sowie eine Schaltung zum Durchschalten einer empfangenen Verkehrszeichenkennung (fk) an die Anzeigevorrichtung (14, 15, 16) bei Übereinstimmung der empfangenen mit der oder einer der abgespeicherten Folgen aufweisen.Wireless display system according to Claim 1, characterized in that at least two transmitters (7, 3), each with at least one signal (f₁, f i ) detectable by the receiver, are provided at intervals from one another, and in that the receivers (11, 13) have a circuit for detecting them the order of the recorded maximum values of the signals (f₁, f₂) and a comparison circuit (21) for comparison with a stored sequence of signals (eg f₁, f i , f₂, f k ) and a circuit for switching through a received traffic sign identifier (f k ) to the display device (14, 15, 16) if the received sequence matches or one of the stored sequences.
EP92890163A 1991-07-04 1992-07-03 Wireless display system for vehicles Withdrawn EP0521846A1 (en)

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AT13449/91 1991-07-04
AT134491 1991-07-04

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US5493291A (en) * 1993-03-31 1996-02-20 Preh-Werke Gmbh & Co. Kg Apparatus for the transfer of information in motor vehicle traffic
US5621571A (en) * 1994-02-14 1997-04-15 Minnesota Mining And Manufacturing Company Integrated retroreflective electronic display
DE19731320A1 (en) * 1997-07-22 1998-04-16 Pitt Fischer Electronic transceiver unit for vehicle
DE19753511A1 (en) * 1997-12-03 1999-06-10 Zlatko Veber Warning detection method for road traffic
GB2363885A (en) * 2000-06-21 2002-01-09 Robert John Pigott Speed limit display for road vehicles
US8781715B2 (en) 2000-09-08 2014-07-15 Intelligent Technologies International, Inc. Wireless sensing and communication system for traffic lanes
US8989920B2 (en) 2000-09-08 2015-03-24 Intelligent Technologies International, Inc. Travel information sensing and communication system
US9558663B2 (en) 2000-10-04 2017-01-31 Intelligent Technologies International, Inc. Animal detecting and notification method and system
US9997068B2 (en) 2008-01-28 2018-06-12 Intelligent Technologies International, Inc. Method for conveying driving conditions for vehicular control

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US9558663B2 (en) 2000-10-04 2017-01-31 Intelligent Technologies International, Inc. Animal detecting and notification method and system
US9997068B2 (en) 2008-01-28 2018-06-12 Intelligent Technologies International, Inc. Method for conveying driving conditions for vehicular control

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