EP0002470A1 - Vehicle controlled traffic signalling device - Google Patents

Vehicle controlled traffic signalling device Download PDF

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Publication number
EP0002470A1
EP0002470A1 EP78101503A EP78101503A EP0002470A1 EP 0002470 A1 EP0002470 A1 EP 0002470A1 EP 78101503 A EP78101503 A EP 78101503A EP 78101503 A EP78101503 A EP 78101503A EP 0002470 A1 EP0002470 A1 EP 0002470A1
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European Patent Office
Prior art keywords
location
antenna
information
vehicle
travel
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EP78101503A
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German (de)
French (fr)
Inventor
Friedbert Becker
Johann Steinkamp
Klaus Koenen
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Siemens AG
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Siemens AG
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/123—Traffic control systems for road vehicles indicating the position of vehicles, e.g. scheduled vehicles; Managing passenger vehicles circulating according to a fixed timetable, e.g. buses, trains, trams
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • G08G1/087—Override of traffic control, e.g. by signal transmitted by an emergency vehicle

Definitions

  • the invention relates to a device for controlling a traffic light system by vehicles, which are provided with devices for automatic location determination (location).
  • the invention has for its object to provide a simple for a device for controlling a traffic light system by such vehicles that are provided with devices for automatic location determination (location).
  • Sede reception antennas radiating across the direction of travel, list in the direction of travel to the driving direction and through a single distribution of the Ormungseinrich the vehicle that information (request telegrams) can be sent to the traffic lights at receiving devices at the same time or during pauses in the measurement for determining the position.
  • an antenna switch is provided, the outputs of which can be optionally connected to the antenna for the traffic light control and via a switch to the branch of the location system and which is controlled by the control circuit in such a way that it corresponds to the shape of its input of modulation signals for transmission of pending information (information for the location or request program) to the relevant output
  • the request telegrams are advantageously modulated onto a carrier in a modulation process orthogonal to the location system.
  • additional location-selective information is transmitted to further receivers installed along the route.
  • These can be arrival notices, for example, which are transmitted to an arrival notification at the bus stops.
  • the block diagram according to FIG. 1 contains the elements of the location system in the top row.
  • On the turnout 1 is on the eiren Side the serd- / receiving antam aschlgêt ,. which is out on the antenna 3 of the Antgortgereas (local guide).
  • the locating system is 'erweiler': by means of traffic light control (APS). These consist of an antenna switch 8, one of which is connected to the soft 1 and a second output to the transmitter antenna 12 for traffic light congestion. Disant 12 is aligned with the antenna 13 at the receiver 14.
  • a control circuit 11 is connected with its two outputs to the antenna switch 8 and the modulator 9.
  • the positioning system is thus expanded so that additional request telegrams can be modulated and sent in a suitable manner. It is provided that a local modulation process is selected, which optimally decouples both functions even when many vehicles are used at the same time. If, for example, the location function is carried out with ASK (amplitude shift keying), FSK (frequency shift keying) is used for the request telegram. Via the switch circuit 11, an input I of which provides information about the type of transmission is only evaluated by the traffic light for which it is intended.
  • ASK amplitude shift keying
  • FSK frequency shift keying
  • the antenna unswitch 8 which may also be omitted, advantageously serves to further decouple the location and control areas of the circuit.
  • Fig. 2 shows a bus 16 on the road on his a transmitting / receiving antenna 17 for the location system (Verke releitsystem) with beam direction transverse to the direction of travel has a further antenna 18 that radiates in the direction of travel.
  • the transmitting / receiving antenna 17 is in radio communication with an answering device 19 (recognition transmitter) which is attached to a light pole 20 to the side of the street.
  • the antenna 18 radiating in the direction of travel radiates onto the receiver 21 at the traffic light 22, via which the additional control of the traffic light system is carried out.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Traffic Control Systems (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

Device for the control of traffic lights (22), an antenna (18) radiating in the direction of travel being provided on the vehicle (16) in addition to the transmitting/receiving antenna (17) radiating transversely to the direction of travel for position determination. The positioning devices of the vehicle are designed such that information items (request messages) to receiving devices of the traffic lights can be produced at the same time as, or during transmission pauses in, the measurement associated with position determination. The device can be used for traffic control systems. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Einrichtung zur Steuerung einer Verkehrsampelanlage durch Fahrzeuge, die mit Vorrichtung-,n zur automatischen Standortbestinmung (Ortung) versehen sind.The invention relates to a device for controlling a traffic light system by vehicles, which are provided with devices for automatic location determination (location).

Figure imgb0001
Zunahme der Motorisierung und damit des innerstädtisehan Verkehrs fuhrt dazu, daß die Fahrzeuge des öffentlichen Nahververkehrs, wie Busse und Straßenbahnen, in Ballungsräumen unter immer schwierigeren Verhältnissen die Dienstleistungsaufgaben erfüllen müssen. Gerade diese Beförderungsmittel sollen jedoch für den Kunden attraktiv und im Betrieb effektiv sein. Damit verknüpft ist das Erfordernis hoher Geschwindigkeit, dichter Wagenfolge und Einhaltung der Fahrplane. Eine wirkungsvolle Disposition des öffentlichen Nahverkehrs erfordert daher die Möglichkeit zur Zwangssteuerung der Grünphasen von Ampelanlagen. Eine solche Z-wangssteuerung ist jedoch noch zwingender beim Einsatz von Rettungs- und Polizeifahrzeugen.
Figure imgb0001
Increased motorization and thus inner-city traffic means that local public transport vehicles, such as buses and trams, have to perform service tasks in conurbations under increasingly difficult conditions. However, these means of transport should be attractive to customers and effective in operation. Associated with this is the need for high speed, tight wagon order and adherence to the timetables. An effective disposition of local public transport therefore requires the possibility to force control of the green phases of traffic lights. However, such a Z-positive control is even more imperative when using rescue and police vehicles.

Bei Strsj3enbahnen wird diese Anforderung zur Grünphase mittals Schienen- bzw. Oberleitungskontakten ausgelöst. Bei Bussen werden induktive Schlei fen einige hunter Meter vor der Kreusung verinduktive Schleifen einige hundert Meter vor der Kreuzung verwendet. Dabei wird entweder über eine Schleife nur die Anwesenheit eines Busses oder über zwei Schleifen die Länge eines Busses gemessen, was jedoch bei Lastwagen von ahnlicher Größe zu Fehlanzeigen führen kann. Dieser Nachteil läßt sich durch Verwendung eines Senders auf den Bus vermsiden. Es besteht dann aber immer die recht aufwendige Installation eines Meldekabels Schleife sur .AmpelIn the case of road railways, this requirement is triggered during the green phase by means of rail or catenary contacts. On buses, inductive loops a few hundred meters before the crossing are used inductive loops a few hundred meters before the crossing. Only the presence of a bus is measured via a loop, or the length of a bus is measured via two loops, which, however, can lead to incorrect displays in trucks of a similar size. This disadvantage can be avoided by using a transmitter on the bus. But then it always exists the fairly complex installation of a signal cable loop sur. traffic light

Dieser Wechteil wiri bei anderen Systemen dadurch vermieden .del sie die Anforderung direkt ven Fahrzeug an einen Ampelempfänger

Figure imgb0002
This interchangeability is avoided in other systems because the requirement that the vehicle be sent directly to a traffic light receiver
Figure imgb0002

Der Erfindung liegt die Aufgabe zugrunde, eine einfache ansugeben fur eine Einrichtung zur Steuerung einer verkehrsampelanlage durch solche Fahrseuge die mit vorrichtungen automatischen Standortbestinmung (Ortung) versehen sind.The invention has for its object to provide a simple for a device for controlling a traffic light system by such vehicles that are provided with devices for automatic location determination (location).

Bei einem solchen Ortungssysten bzw. eimer solchen Standortte - stimmung von Fahrzesugen , deren Streckeverkauf vorgeschrieben ist , werden sweckmaßigerweise zwei Kriterien verglichen : einmal die fast vergegebene Weglange zwischen einem Ausgangspunkt und einem passiertun Ortskennungsgeber und zum arderen die laut kilometer-

Figure imgb0003
des Fahenuges zuruckgelegte Wegstrecke vom Ausgangspunkt bis zu diesen Ortskennungsgeber Da in der Zentrale die genaue Weglänge swischen dem Anfangspunkt und dem Montageort eines jeden Ortkennungsgebers bekannt ist, kann z.B. ein Leitrechner aus dem
Figure imgb0004
die Abweichung vom Sollwert bestinnem und allle späteren Angaben dieses Fahrzeuges mit Hilfe des Korrekturfaktors berichtigen Auf diese Weise läßt, sich eine hohe Or-
Figure imgb0005
erreichen .ßei einem solchen Ubertragungssyst em sur informationsubertragung zwischen dem jeweiligen Ortskennungsgeber- und dem Fahrteug ist ein Lesegerä am Faherzeug und ein Antwortgeart (Ortskennungsgeber )das in bestinmten Abstanden längs des Fahrweges angebracht ist, vorgesehen.With such a location system or bucket of such location determination of vehicles, the route sale of which is mandatory, two criteria are compared comparably: first, the almost given distance between a starting point and a passed location identifier and, to put it differently, the kilometer
Figure imgb0003
of the distance traveled from the starting point to this location identifier. Since the exact path length between the starting point and the installation location of each location identifier is known in the control center, a host computer from the
Figure imgb0004
Correct the deviation from the target value and correct all later information on this vehicle with the help of the correction factor.
Figure imgb0005
To achieve such a transmission system for transmitting information between the respective location identifier and the vehicle, a reader is provided on the vehicle and a response type (location identifier) which is attached at certain intervals along the route.

Die Aufgabe, duren Fahrzeuge mit Ortungssystemen der- vorstehend beschriebenen Art Verkehrsampelanlagen au, steueurm wird geras- fer Enfindung gelost durch eine ru der fur die Standortbestin- rung vorhanderne, . quer sur Fahrtrichtung strahlenden Sede- Empfangszantenne zusataliste , in Fahratrichrung sttrahnnde an Fahrtsung und durch aine soleine Auseiliung der Ormungseinrich tungen des Fahrzeuges, daß gleichzeitig oder in Sendepausen der Messung zur Standcrtbestimmung Informationen (Aufforderungstelegramme) an Empfangseinrichtungen an die Verkehrsampeln absetzbar sind.The task of controlling vehicles with location systems of the type described above as traffic light systems is solved more rapidly by a rudder available for determining the location. Sede reception antennas radiating across the direction of travel, list in the direction of travel to the driving direction and through a single distribution of the Ormungseinrich the vehicle that information (request telegrams) can be sent to the traffic lights at receiving devices at the same time or during pauses in the measurement for determining the position.

In vorteilhafter Ausgestaltung des Anseidungsgegenstandes ist ein Antennenumschalter vorgesehen, dessen Ausgänge wahlweise an die Antenne für die Ampelsteuerung und über eine Weiche an den Zweig des Ortungs Systems anschaltbar sind und der von iner Steuerschaltung derart angesteuert wird, daß er entsprechend der jeweils an seinem Eingang in Form von Modulationssignalen zur Übertragung anstehenden Information (Information für die Ortung oder Aufforderungstslegramm) auf den betreffenden Ausgang durchgesuhaltet wirdIn an advantageous embodiment of the object of attachment, an antenna switch is provided, the outputs of which can be optionally connected to the antenna for the traffic light control and via a switch to the branch of the location system and which is controlled by the control circuit in such a way that it corresponds to the shape of its input of modulation signals for transmission of pending information (information for the location or request program) to the relevant output

Die Aufforderungstelegrsmme sind in vorteilhafter Weise in einem zum Ortungssystem orthogonalen Mcdulationsverfahren einem Träger aufmoduliert.The request telegrams are advantageously modulated onto a carrier in a modulation process orthogonal to the location system.

In vorteilhafter Weiterbildung des Anmeldungsgegenstandes ist femer vorgesehen, daß zusätzliche ortsselektive Informationen an weiterey längs des Fahrweges installierte Empfanger übertragen werden. Hierbei kann es sich beispielsweise um Ankunftshinweise handeln, die auf eine Ankunftsanzeige an den Bushaltestellen übertragen werden.In an advantageous development of the subject of the application it is further provided that additional location-selective information is transmitted to further receivers installed along the route. These can be arrival notices, for example, which are transmitted to an arrival notification at the bus stops.

Nachstehend wird die Erfindung anhand von in der Zeichnung dargestellten Ausführungsbeispielen naher erläutert.The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the drawing.

Es zeigen:

  • Fig. 1 das Ortungssystem mit der kombinierten Ampelsteuerung in einem Blockschaltbild und
  • Fig. 2 einen Bus im Straßenver mit den erforderlichen Crtungs-und Steuerungseinrichtungen am Bus und am Straßenrand.
Show it:
  • Fig. 1, the location system with the combined traffic light control in a block diagram and
  • Fig. 2 shows a bus in the street with the necessary routing and control devices on the bus and on the roadside.

Das Blockschaltbild rach Fig. 1 enthäl in der oberem- Reihe die Elemente des Ortungssvstems . An der Weiche 1 ist an der eiren Seite die serd-/Empfangsantam aargsschlossen,. die auf die Antenne 3 des Antgortgereas (Ortskanungsgaber) ausgeritshurt ist. An der anderen Seine der deiche 1 sind sin Frequenzursetzer 5. eine Einheit 6 für analoge Signalverarbeitung und eine Einheit fur digitale Signalverarbeitung aneinsndergeschaltet. An der digitalen Signal Verarbeitung 7 erfolge die Datenausgabe.The block diagram according to FIG. 1 contains the elements of the location system in the top row. On the turnout 1 is on the eiren Side the serd- / receiving antam aschlgschlossen ,. which is out on the antenna 3 of the Antgortgereas (local guide). On the other bank of the dykes 1, there are frequency converters 5, a unit 6 for analog signal processing and a unit for digital signal processing. The data is output at the digital signal processing 7.

Das Ortungssystem ist erweiler': durch Einrichtungen für die Ampelstsuerung (APS). Diese bestehen aus einem Antennenumschalter 8, von dem ein Ausgeng mit der weiche 1 verbundsn ist und ein zweiter Ausgang mit derSendeantenne12 für die Ampelstauerung.DisAntanne12ist auf die Antenne 13anAmpalempfënger 14 ausgerichtet. DereineEingangdes Antennenumschalters8 ist miteinemunschaltharerModulator 9verbunden, an den einFestfrequenzoszillator10 der Frequenz f = 2,45 CHzangeschaltet ist. Eine Steuerschaltung 11 ist mit ihren beiden Ausgängen an den Antennenumschalter 8und den Modulator9 angeschlossen.The locating system is 'erweiler': by means of traffic light control (APS). These consist of an antenna switch 8, one of which is connected to the soft 1 and a second output to the transmitter antenna 12 for traffic light congestion. Disant 12 is aligned with the antenna 13 at the receiver 14. The input of the antenna switch 8 is connected to a switchable modulator 9 to which a fixed frequency oscillator 10 of frequency f = 2.45 CH is connected. A control circuit 11 is connected with its two outputs to the antenna switch 8 and the modulator 9.

Das. Ortungssystemist dabei also so erweitert, daß zusätzlich auch Aufforderungstelegramme ingeeigneterWeise aufmoduliert und abgesetzt werden können.Es ist dabei vorgesehen, daß ein run Ortungessystemorthogonales Modulationsverfahren gewählt wird, wodurch eine optimale Störentkopplung beider Funktionen auch bei gleichzeitigemEinsatz vieler Fahrzeuge erreicht wird. Wenn also beispielsweise die Ortungsfunktion mitASK (Amplitudeshift keying) durchgeführt wird,wird für das Aufforderungstelegramm FSK (Frequency shift keying) verwendet. Über die StsuerschaLtung 11, deren einem Eingang I eine Information über die Sendeart

Figure imgb0006
jeweils nur von der Ampel ausgewertet wird, für die es bestimmt ist.The. The positioning system is thus expanded so that additional request telegrams can be modulated and sent in a suitable manner. It is provided that a local modulation process is selected, which optimally decouples both functions even when many vehicles are used at the same time. If, for example, the location function is carried out with ASK (amplitude shift keying), FSK (frequency shift keying) is used for the request telegram. Via the switch circuit 11, an input I of which provides information about the type of transmission
Figure imgb0006
is only evaluated by the traffic light for which it is intended.

Der Antennenunschalter 8, der gegebenenfalls auch entfallen kann, dient in vorteilhafter Weise einer weitaren Entkopplung des Ortungs- und des Steuerbereichs der Schaltung.The antenna unswitch 8, which may also be omitted, advantageously serves to further decouple the location and control areas of the circuit.

Fig. 2 zeigt einen Bus 16 im Straßenverkehr, der auf seinem

Figure imgb0007
eine Sende-/Empfangsantenne 17 für das Ortungssystem (Verke releitsystem) mit Strahlrichtung quer zur Fahrtrichtung aufweist eine weitere Antenne 18, die in Fahrtrichtung strahlt. Die Sende-/ Empfangsantenne 17 steht mit einen Antwortgerät 19 (Erkennungsgeber) in Funkverbindung, der an einem Lichtmast 20 seitlich der Straße befestigt ist. Die in Fahrtrichtung strahlende Antenne 18 strahlt auf den Empfänger 21 an der Verkehrsampel 22, über den die zusätzliche Steuerung der Verkehrsampelanlage vorgenommen wird.Fig. 2 shows a bus 16 on the road on his
Figure imgb0007
a transmitting / receiving antenna 17 for the location system (Verke releitsystem) with beam direction transverse to the direction of travel has a further antenna 18 that radiates in the direction of travel. The transmitting / receiving antenna 17 is in radio communication with an answering device 19 (recognition transmitter) which is attached to a light pole 20 to the side of the street. The antenna 18 radiating in the direction of travel radiates onto the receiver 21 at the traffic light 22, via which the additional control of the traffic light system is carried out.

Claims (4)

1. Einrichtung zur Steuerung' einer Verkehrsampelanlage durch Fahrzeuge, die mit Vorrichtungen zur automatischen Standortbestimmung (Ortung) versehen sind, gekennzeichnet durch eine zu der für die Standortbestimmung vorhandenen, quer zur Fahrtrichtung strahlenden Sende-/Empfangsantenne zusätzliche, in Fahrtrichtung strahlende Antenne am Fahrzeug und durch, eine solche Ausbildung der Ortungseinrichtungen des Fahrzeuges, daß gleichzeitig oder in Sendepausen der Messung zur StandortbeStimmung Informationen (Aufforderungstelegramme) an Empfangseinrichtungen an die Verkehrsampeln absetzbar sind.1.Device for controlling a traffic light system by vehicles which are provided with devices for automatic location determination (location), characterized by an antenna for the location determination, which radiates transversely to the direction of travel and has an additional antenna which radiates in the direction of travel on the vehicle and through, such a design of the location devices of the vehicle that information (request telegrams) can be sent to the traffic lights at reception devices at the same time or during transmission pauses of the measurement for determining the location. nach Ansoruch 1,dadurch gekennzeichnst,daβein 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daB ein Antennenumschalter vorgesehen ist, dessen Ausgänge wahlweise an die Antenne für die Ampelsteuerung und über eine Weiche an den Zweig des Ortungssystems ansehaltbar sind und der von einer Steuerschaltung derart angesteuert wird, daB er entsprechend der jeweils an seinem Eingang in Form von Modulationssignalen zur Übertragung anstehenden Information (Information für die Ortung oder Aufforderungstelegramm) auf den betreffenden Ausgang durchgeschaltet wird.according to Ansoruch 1, characterized in that a second device according to claim 1, characterized in that an antenna switch is provided, the outputs of which can be optionally connected to the antenna for the traffic light control and via a switch to the branch of the location system and which can be controlled by a control circuit controlled that it is switched through to the relevant output in accordance with the information pending at its input in the form of modulation signals for transmission (information for the location or request telegram). 3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Aufforderungstelegramme in einem zum Ortungssystem orthogonalen Modulationsverfahren einem Träger aufmoduliert sind. Eihrichtung nacheinemdervorergehenden3. Device according to claim 1 or 2, characterized in that the request telegrams are modulated onto a carrier in a modulation method orthogonal to the location system. Direction according to one previous 4.Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zusätzliche' ortsselektive Informationen an weitere, längs des Fahrweges installierte Empfänger übertragen werden.4.Device according to one of the preceding claims, characterized in that additional 'location-selective information is transmitted to further receivers installed along the route.
EP78101503A 1977-12-05 1978-12-01 Vehicle controlled traffic signalling device Ceased EP0002470A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2754024 1977-12-05
DE2754024A DE2754024C3 (en) 1977-12-05 1977-12-05 Device for controlling a traffic light system

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EP0002470A1 true EP0002470A1 (en) 1979-06-27

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EP78101503A Ceased EP0002470A1 (en) 1977-12-05 1978-12-01 Vehicle controlled traffic signalling device

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EP (1) EP0002470A1 (en)
JP (2) JPS54100300A (en)
AT (1) AT369176B (en)
AU (1) AU526019B2 (en)
CA (1) CA1130405A (en)
DE (1) DE2754024C3 (en)
DK (1) DK548978A (en)
ES (1) ES475730A1 (en)
FI (1) FI783710A (en)
IT (1) IT1100513B (en)
NO (1) NO146793C (en)

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Publication number Priority date Publication date Assignee Title
DE3014928C2 (en) * 1980-04-18 1991-12-12 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Arrangement for detecting the location of a vehicle
DE3016480A1 (en) * 1980-04-29 1981-11-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Determining location of vehicle along known route - using variable integration factor selected by place code and pulse generator in vehicle
DE3130705A1 (en) * 1981-08-03 1983-02-17 Siemens AG, 1000 Berlin und 8000 München Arrangement for controlling a traffic light system by means of vehicles
DE102007049352B4 (en) * 2007-10-15 2010-12-09 Siemens Ag Traffic light system and its use

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2614357A1 (en) * 1975-04-04 1976-10-14 Almex Ab DEVICE FOR REGISTERING OBJECTS AND TRANSMITTING ADDITIONAL INFORMATION DEPENDING ON REGISTRATION

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS503598A (en) * 1973-05-14 1975-01-14
US3940630A (en) * 1974-10-21 1976-02-24 Mcdonnell Douglas Corporation Vehicle locator
JPS51102793A (en) * 1975-03-07 1976-09-10 Nippon Electric Co

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2614357A1 (en) * 1975-04-04 1976-10-14 Almex Ab DEVICE FOR REGISTERING OBJECTS AND TRANSMITTING ADDITIONAL INFORMATION DEPENDING ON REGISTRATION

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NO146793C (en) 1982-12-08
JPS5922638Y2 (en) 1984-07-05
JPS58167995U (en) 1983-11-09
DK548978A (en) 1979-08-14
IT7830444A0 (en) 1978-12-01
ATA827678A (en) 1982-04-15
DE2754024B2 (en) 1980-02-14
FI783710A (en) 1979-06-06
AU4215878A (en) 1979-06-14
AU526019B2 (en) 1982-12-16
ES475730A1 (en) 1979-05-01
AT369176B (en) 1982-12-10
IT1100513B (en) 1985-09-28
JPS54100300A (en) 1979-08-07
CA1130405A (en) 1982-08-24
DE2754024A1 (en) 1979-06-07
DE2754024C3 (en) 1980-10-02
NO783903L (en) 1979-06-06
NO146793B (en) 1982-08-30

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