EP0136956A2 - System zur Detektion von einem vorbestimmten Hindernis auf dem Weg eines Strassenfahrzeuges - Google Patents

System zur Detektion von einem vorbestimmten Hindernis auf dem Weg eines Strassenfahrzeuges Download PDF

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Publication number
EP0136956A2
EP0136956A2 EP84401966A EP84401966A EP0136956A2 EP 0136956 A2 EP0136956 A2 EP 0136956A2 EP 84401966 A EP84401966 A EP 84401966A EP 84401966 A EP84401966 A EP 84401966A EP 0136956 A2 EP0136956 A2 EP 0136956A2
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EP
European Patent Office
Prior art keywords
vehicle
receiver
transmitter
signal
obstacle
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.)
Withdrawn
Application number
EP84401966A
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English (en)
French (fr)
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EP0136956A3 (de
Inventor
Guy René Rambaud
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Thomson Grand Public
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Thomson Grand Public
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Filing date
Publication date
Application filed by Thomson Grand Public filed Critical Thomson Grand Public
Publication of EP0136956A2 publication Critical patent/EP0136956A2/de
Publication of EP0136956A3 publication Critical patent/EP0136956A3/de
Withdrawn legal-status Critical Current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
    • G08G1/16—Anti-collision systems
    • G08G1/161—Decentralised systems, e.g. inter-vehicle communication
    • G08G1/163—Decentralised systems, e.g. inter-vehicle communication involving continuous checking

Definitions

  • the invention relates to a system for detecting a predetermined obstacle in the path of a land vehicle. It is intended to be mounted on land vehicles in order to warn their users of the presence of predetermined obstacles, in particular other vehicles, in front of them.
  • these systems have a major drawback: whatever the obstacle which is in the detection zone, they indicate the presence of it and it is difficult for the user to know if it is an obstacle presenting a danger or not, and to adopt the safety maneuver accordingly: indeed, these systems can indicate both the presence of a terminal or a post in a bend, as well as the presence of a vehicle on the roadway because there is no discrimination.
  • the invention is the result of this observation that it is essential to be able to distinguish the type of obstacle in front in poor visibility conditions, and that it is important to know whether the way is clear or not, in order avoid a collision between the vehicle and the obstacle.
  • the system according to the invention is intended to detect, from a vehicle, the presence of a predetermined obstacle lying in the path of said vehicle, and is characterized in that it comprises a transmitter fixed to the obstacle and intended to directly issue a information in the probable direction of occurrence of the vehicle for which it represents a danger, and a receiver fixed to the vehicle and arranged to receive exclusively the signal emitted from an obstacle in its path.
  • this system can be easily implemented to detect from a vehicle the presence of another vehicle traveling in front and in the same direction during poor visibility conditions, in rain, fog or snow.
  • these means also make it possible to indicate the distance at which the vehicle making or at risk of obstructing is located as well as its speed.
  • Such an arrangement is particularly advantageous for the driver because it allows him to know whether he should simply reduce the speed, or even whether he should stop.
  • the device according to the invention is composed of a wave transmitter and a receiver tuned to receive the transmitted wave.
  • the transmitter is arranged on a first vehicle so as to transmit rearward and the receiver is arranged in front of a second vehicle so as to receive the wave emitted by the vehicle traveling in front and in the same direction.
  • repeater devices consist of a receiver which, when excited by the transmitter of the obstructing vehicle, controls a retransmitter emitting in the direction of occurrence of the vehicles for which it represents a potential danger.
  • the advantage of such an arrangement is that one is certain, as soon as the receiver receives a signal, that this signal was emitted from a vehicle which is or is likely to be on the path of the vehicle. whose receiver is excited.
  • the waves used are electromagnetic waves because it is much easier to direct them in a precise direction on emission.
  • the system consists of a wave transmitter intended to be placed on a first vehicle so as to transmit directly to the rear, and a receiver intended to be mounted on the front of a second vehicle.
  • a wave transmitter intended to be placed on a first vehicle so as to transmit directly to the rear
  • a receiver intended to be mounted on the front of a second vehicle.
  • FIGs 1 to 3 there is shown a roadway bounded by two edges Bl and B2. This roadway has two traffic lanes VI and V2 separated by a longitudinal axis L.
  • Figure 1 shows the operation of a device of the prior art.
  • Two vehicles 1 and 2 are traveling in the same direction, on track V 1 .
  • the vehicle 2 is provided with a device D of the prior art, at the front.
  • This device emits a wave forward, according to a C2 cone of angle A2.
  • the first vehicle 1 is located in the emission cone C2 of the device D. It reflects the wave transmitted in a direction 01 towards the vehicle 2.
  • the receiver integrated into the device D detects the presence of this vehicle.
  • an obstacle 3 is shown near the corresponding edge Bl. This obstacle 3 is for example a terminal or a post which is also located inside the cone C2 emitted by the device D.
  • This obstacle 3 therefore reflects in a direction 03, towards the device D, part of the signal emitted.
  • a third vehicle 4 is shown traveling on track V2, in the opposite direction to the first two vehicles. This vehicle is partially represented in the emission cone C2 of the device D. This vehicle therefore reflects part of the wave emitted by the device in a direction 04 towards the device D.
  • the receiving part of the device D receives the waves reflected by at least three different obstacles and it is easy to deduce that, if each had been present separately, the presence of each would have been detected without the user of the vehicle 2 being able to know s 'It was a vehicle traveling in the same direction or an obstacle at the edge of the road or a vehicle arriving in the opposite direction.
  • Figures 2 and 3 show the operating principle of the system of the invention, in two different traffic conditions and allow to show its advantages compared to the device of the prior art which has just been described.
  • Figure 2 are shown three vehicles traveling in the same direction on two lanes V1 and V2 of different traffic. This figure shows the traffic conditions on a highway or on a road with four lanes of traffic.
  • the rear of the vehicle 5 is provided with a wave transmitter E5.
  • This transmitter E5 emits according to a cone C5 with an opening angle A5.
  • the vehicle 6 is shown inside the emission cone C5 of the transmitter E5 and is provided, at the front, with a receiver R6.
  • This receiver R6 therefore receives directly from the transmitter E5, in an incident direction 16, part of the wave emitted by the transmitter E5.
  • an obstacle 8 other than a vehicle is shown near the edge B1 of the corresponding track.
  • This obstacle for example a terminal or a pole, receives part of the wave emitted by the transmitter E5 in an incident direction 15.
  • This obstacle reflects part of the wave received from the transmitter E5 towards the vehicle 6 according to a direction of reflection F8.
  • This wave is therefore also received by the receiver R6 but is in no way a drawback. Indeed, for an obstacle 8 to reflect a wave, this wave must have been emitted by the transmitter of a preceding vehicle and this obstacle must be in the emission cone. Thus, a wave reaches the receiver of a vehicle only if this vehicle is in the emission cone of the transmitter of a previous vehicle, traveling in the same direction.
  • a vehicle 7 is shown on the second traffic lane V2, traveling in the same direction as vehicles 5 and 6.
  • the latter vehicle 7 is also provided with a transmitter E7.
  • the vehicle 6 is also located in the emission cone 7, of angle A7, of this transmitter E7. Its receiver R6 therefore also receives the wave transmitted by this transmitter.
  • the driver of the vehicle 6 therefore cannot know whether the signal is emitted by a vehicle on one track or on the other or by two vehicles. This does not matter because the purpose of the system is to warn the user that at least one vehicle is driving in front, or else is stopped, and therefore represents an immediate danger.
  • FIG. 3 shows driving conditions on normal road with two-way traffic.
  • a vehicle 9 fitted with a transmitter E9 of the system according to the invention transmits in the direction of a vehicle 10 which follows it.
  • This vehicle 10 is provided with an RIO receiver and is located in the cone C9 of angle transmission A9. Its receiver therefore receives a wave transmitted in a preferred direction 110.
  • a vehicle 11, traveling in opposite direction, is shown between the two vehicles. It is in the emission cone C9 of the transmitter E9 and therefore receives a wave in a direction 19 which it reflects in a direction FI1 in the direction of the receiver R10 of the vehicle 10.
  • this reflected wave is in no way a drawback because it can only exist if a vehicle, in this case the vehicle 9, having an emitter E9 is in front.
  • This system therefore makes it possible to warn the driver of a vehicle that another vehicle is traveling in front of him in the same direction and represents a potential danger.
  • the transmission power of each of the transmitters arranged on the vehicles is constant and the detection threshold of the receivers is adjusted so that a receiver detects a vehicle having a transmitter only in the vicinity from a distance of 250 meters, which represents a good safety margin in poor visibility.
  • this threshold is adjustable and that it is proportional to the speed at which the vehicle fitted with the receiver is traveling: it is known that the safety distances must be greater when the speed is higher.
  • a system (not shown) supplies a threshold signal, a function of speed, to the reception stage of the receiver.
  • the waves used are electromagnetic waves. They have the advantage of allowing better directivity at the time of transmission.
  • the transmitters and receivers used are therefore transmitters and receivers of electromagnetic waves.
  • the transmitter emits an electromagetic wave in the X band, that is to say at a frequency of the order of 10 Gigahertz.
  • the receiver is therefore arranged to receive a wave transmitted in this frequency band.
  • FIG. 4 shows the block diagram of the transmitter used in the context of the present invention.
  • the transmitter conventionally comprises an oscillator circuit 12 delivering a signal of desired frequency in the X band. This signal is applied, via an impedance adapter stage 13 to the input of an amplifier circuit I4, of which the role is to amplify the signal produced by the oscillator before transmitting it to the transmitting antenna.
  • Figures 5, 6 and 7 show different variants of the device for receiving and displaying information.
  • FIG. 5 shows a basic receiver.
  • An antenna 16 receives the signal transmitted from a transmitter, as soon as this receiver is in the range of the transmitter.
  • the signal is transmitted to a reception stage 17, the detection threshold of which is either fixed or a function of the speed of the vehicle, as described above. It passes through an amplifier circuit 18 whose role is to obtain an amplitude signal which can be used for comp. command of a display circuit 19.
  • the display circuit indicates to the user whether or not there is detection of a signal and therefore indicates to him if he is approaching a vehicle traveling in front of him.
  • the circuit of FIG. 6 represents an improved embodiment of the receiver. It was said later that the transmission is made at constant power. However, it is known that the signal strength received by a receiver is inversely proportional to the square of the distance which separates this receiver from the transmitter.
  • the circuit of FIG. 6 comprises an antenna 16 for receiving the signal, which is then directed to a stage 17 for reception and then to an amplifier 18 which outputs another signal whose power is proportional to the power of the signal received.
  • a circuit 20 makes it possible to measure the power of the output signal of the amplifier and therefore to determine the distance separating the transmitter from the receiver. The output signal from this circuit 20 is then applied to a distance display circuit 21. This device is therefore more efficient than the previous one because it allows you to see if you are getting closer or if you are moving away from the previous vehicle.
  • the circuit of FIG. 7 is an improved variant of the preceding circuits.
  • this circuit we find the various elements of the circuit of Figure 6, that is to say the antenna 16 for reception, the stage 17 for reception, the amplifier 18, the circuit for measuring the power 20 and circuit 21 for distance display.
  • the improvement results from the fact that at the amplifier output the signal is taken in order to measure its frequency using a frequency meter circuit 22.
  • the output signal of the frequency meter 22 is transmitted to a calculation circuit 23.
  • the role of this circuit is to calculate the relative speed of the preceding vehicle with respect to the vehicle in which the receiver is located.
  • the Doppler effect in a manner known per se: we know the transmission frequency of the transmitter circuit and it is known that if the transmitter moves away from the receiver, the frequency received by the receiver is less than the frequency transmitted and, conversely, if the transmitter approaches the receiver, the frequency received is greater than the frequency transmitted. It is further known that the frequency variation is proportional to the relative speed between the transmitter and the receiver.
  • the calculation circuit 23 provides an output voltage proportional to the relative speed between the two vehicles. In the embodiment chosen, the signal supplied is positive when the two vehicles approach each other, that is to say when the vehicle fitted with the receiver is faster than the vehicle fitted with the transmitter. Otherwise, the output signal is negative. This output signal is applied to the minus (-) inverting input of an adder circuit 24.
  • a voltage proportional to the actual speed of the vehicle on which the receiver is fixed is applied at its non-inverting plus (+) input.
  • This voltage comes from a calculation circuit 25.
  • This circuit 25 for calculating the speed of the vehicle on which the receiver is fixed can also be used to supply the threshold signal as a function of speed to the reception circuit 27, as envisaged previously.
  • a proportional signal is therefore obtained for the actual speed of the vehicle fitted with the transmitter. This signal is applied to the input of a circuit 26 for calculating and displaying this real speed.
  • this last embodiment indicates to the driver the parameters necessary to dictate to him the behavior to be adopted: he knows the distance which separates him from the preceding vehicle and he knows whether this vehicle is stopped or running.
  • the signal transmitted is different according to the type of vehicle which transmits it.
  • the receiver circuit analyzes the signal transmitted and the user is warned of the type of obstacle he is likely to encounter: motor vehicle, public transport, transport of hazardous materials, or even priority vehicle.
  • the receivers must include frequency counters and / or decoders and the transmitters must include encoders.
  • the transmitter E5, E7 is connected to the ignition circuit of the brake lights of the vehicle on which it is fixed. During braking, the transmitter then transmits a particular signal, either at a different carrier frequency, or in the form of a coded digital signal. Thus, the receiver of a following vehicle detects braking.
  • the user of the vehicle having the receiving circuit is warned by an audible and / or visual signal as soon as he gets too close to the previous vehicle.
  • the reception circuit is connected to the vehicle braking circuit and causes braking as soon as the distance becomes too restricted.
  • the transmitter disposed on the vehicle is connected to the electrical circuit supplying the distress signals.
  • the receiver is permanently powered as soon as the vehicle on which it is fixed is started. Under normal traffic conditions, the transmitter transmits directly towards the rear of the vehicle on which it is fixed. However, it may happen that this vehicle during an incident gets across the road and, in this case, the signal transmitted from the transmitter is not received by another vehicle which is heading towards it. But, generally, in such In this case, the user of the vehicle across the road makes use of his distress light signals.
  • the transmitter is connected to the distress signal supply circuit, and is arranged so that, when these signals are used, the transmission power is increased and that the transmission takes place according to a less directivity. Thus, a vehicle placed across the road is detected from a vehicle moving towards it, whatever its source.
  • FIG. 8 represents an alternative embodiment of the system for the detection of a vehicle leaving a turn, from another vehicle tackling this turn.
  • the portion of roadway shown in this figure has two traffic lanes in opposite directions. On one of the lanes, two vehicles have been shown: the first vehicle 81 is at the end of a turn while the second vehicle 82 approaches the turn.
  • Vehicles 81 and 82 are respectively fitted at the front with RSI and RS2 receivers and at the rear with E81 and E82 transmitters.
  • the two vehicles Due to the presence of the turn, the two vehicles are not on the same trajectory and the receiver R82 of the second vehicle 82 is out of range of the transmitter E81 of the first vehicle 81.
  • a repeating station composed of a receiver RS3 and a transmitter TS4 activated by the receiver.
  • the receiver R83 is associated with a reception antenna 83 directed towards the exit of the turn.
  • the transmitter T84 is associated with a transmission antenna 84 directed towards the entrance to the turn.
  • the operation is as follows: when the first vehicle leaves the turn and approaches the straight section situated at the exit, the signal transmitted by its transmitter E81 is picked up by the antenna 83 for receiving the repeating station. The receiver R83 then processes the signal, transmits it to the transmitter TS4. and a signal is then retransmitted via the transmitting antenna 84 towards the entrance to the turn.
  • a second repeater station is provided for the second lane.
  • This station includes a receiver R85 associated with a reception antenna 85 and a transmitter T86 associated with a transmission antenna 86.
  • Figure 9 shows the system suitable for hill tops.
  • a single traffic lane It is understood that the summit can be equipped with as many repeater stations as there are routes.
  • a repeater station consisting of an RX receiver associated with an antenna 88 and a TX transmitter associated with an antenna 89 is mounted so that the antenna beam has a maximum range on either side of the top of the coast. In the case of very accentuated peaks, as in FIG. 9, in order to obtain a maximum range, the station is mounted on a bracket supported by a pole 87.
  • the operation is identical to that of the repeater stations placed in the bends.
  • a second vehicle 91 arrives in the range of the transmit antenna 89, while the first vehicle 90 is still in the range of the receive antenna, the R 91 receiver of the second vehicle is activated and the driver is informed of the presence of the first vehicle.
  • the first vehicle 90 is also provided at the front with a receiver R90 and the second vehicle 91 is provided at the rear with a transmitter E91.
  • the receiver when the receiver receives a signal transmitted from a vehicle, it generates a control signal from the station transmitter which then transmits at constant power. In this case, the receiver of a vehicle arriving in the range of the station transmitter can only assess the distance between it and the station transmitter.
  • the power of the signal transmitted by the transmitter of a repeating station is modulated as a function of the power received by the receiver.
  • the repeater station performs only a retransmission of the received wave. without transposition, at the same carrier frequency.
  • the evaluation of the distance and the relative speeds is still possible thanks to this implementation.
  • the repeater station has an amplifier stage to compensate for the losses caused by the components (antennas, connection cables, etc.).
  • Figure 10 shows a variant of the system suitable for detecting vehicles approaching a crossroads.
  • the intersection has four access routes V1, V2, V3, V4 which are substantially orthogonal to each other and located two by two in the extension of one another.
  • Track V1 is an extension of track V3
  • track V2 is an extension of track V4.
  • the purpose of the system is. in this case, to allow the detection from a vehicle of any vehicles approaching the crossroads on the lanes adjacent to those where the first is located.
  • reception antennas R1, R2, R3, R4 are respectively placed on the tracks V1, V2, V3, V4 leading to the crossroads.
  • These antennas are at a distance from the crossroads such that they must receive the signal emitted from a vehicle transmitter at the moment when this vehicle becomes a potential danger for possible vehicles approaching on adjacent lanes.
  • Each antenna is respectively associated with an RXI, RX2, RX3, RX4 receiver.
  • each receiver must be associated with two signal retransmission devices on the adjacent channels.
  • each transmitter is connected to the receivers of the two adjacent channels.
  • the receiver RX1 of the channel V1 is connected respectively to transmitters TX1 and TX3 transmitting in the direction of the channels V2 and V4 adjacent to the channel VI by means of transmitting antennas T1 and T3.
  • the receiver RX2 of the channel V2 is connected respectively to transmitters TX2 and TX4 transmitting in the direction of the channels V3 and V1, adjacent to the channel V2 via transmitting antennas T2 and T4.
  • the receiver RX3 of the channel V3 is connected respectively to transmitters TX3 and TX1 transmitting in the direction of the channels V4 and V2 adjacent to the channel V3 via transmitting antennas T3 and Tl.
  • the receiver RX4 of the channel V4 is connected respectively to transmitters TX4 and TX2 transmitting in the direction of the channels VI and V3 adjacent to the channel V4. via T4 and T2 antennas.
  • this embodiment requires only four transmitters and four receivers linked in pairs.
  • the power of a station transmitter in the direction of a track is such that the passing receiver of a vehicle placed on this track is not excited by the signal transmitted by the transmitter.
  • the transmission power of the transmitter TX2 is such that the receiver RX3 cannot be excited by this transmitter TX2.
  • a vehicle 28 is on track V2, in the direction of the crossroads, between the receiving antenna R2 and the crossroads.
  • the transmitter E28 of this vehicle therefore transmits a wave towards the antenna R2.
  • the receiver RX2 is then excited and controls the emission of the associated transmitter TX2 in the direction of the channel V3 and the emission of the associated transmitter TX4 in the direction of the channel VI respectively via the transmission antennas T2 and T4.
  • Vehicle 29 approaching the crossroads on track V3 has not yet passed the receiving antenna R3 associated with this track. and this therefore does not receive the wave emitted by the transmitter E29 of the vehicle 29.
  • the front of the vehicle arrives in the area this range of the transmitter TX2 and the associated receiver R29, mounted at the front of vehicle 29, is excited and the driver of vehicle 29 is informed of the approach of vehicle 28 on one of the adjacent lanes.
  • the transmitters of the intersection repeater stations retransmit at different carrier frequencies than those of the vehicle transmitters.
  • the vehicle receivers include, for example, frequency meters so that the different frequencies received are measured and it can be deduced therefrom that the vehicle receiver is excited by another vehicle in front and / or by an approaching vehicle from the crossroads on an adjacent lane.
  • the signals transmitted by the transmitters of the vehicles as well as the signals retransmitted by the transmitters of the repeating stations are transmitted at the same carrier frequency, modulated by a different coded binary signal.
  • the vehicle receivers include decoders for these digital signals, and it is therefore possible to know whether the received signal is due only to a vehicle in front of or on an adjacent track or to at least two vehicles. , one in front, the other on an adjacent lane.
  • each of the repeaters of the repeater stations of a crossroads retransmits with a carrier frequency or a modulating signal or even a different code depending on the route from which a vehicle comes.
  • the signals are retransmitted alternately.
  • the vehicle receivers then include decoders associated with display devices making it possible to indicate if a vehicle is in front, and if vehicles are on the adjacent lanes and on which side.
  • Visualization inside the vehicle can be carried out using different light and / or sound signals depending on the origin of the obstacle.
  • the signaling is carried out using arrows directed in three directions (left, right, same direction), to indicate the origin of the obstacle.
  • each type of vehicle can emit a different signal depending on its nature.
  • the decoder associated with the receiver of a vehicle is arranged to detect the type of vehicle and it is therefore possible to indicate which type of vehicle is approaching and where it is coming from.
  • the transmitters of the repeating stations retransmit a different coded or modulated signal according to the nature of the adjacent channels.
  • the decoding device associated with the receiver of a vehicle therefore makes it possible to inform the user of the vehicle that he is on a priority lane, or that the lane he will cross has priority, or even that the lane where it is found and that which it will cross have the same classification.
  • the receivers of the repeater stations are placed at a distance from the crossroads such as when a vehicle which has been detected by one of them has crossed the crossroads and therefore no longer presents a potential danger for them. vehicles arriving on the adjacent lanes, the wave emitted by the transmitter of this vehicle is no longer perceived by the receiver of the corresponding repeating station.
  • intersection repeater stations are provided with storage devices which record the times of arrival of the vehicles at the level of the receivers associated with these stations.
  • the transmitters of the vehicles are arranged to emit a signal containing information on his identity.
  • a receiver can be used to calculate the speed of the vehicle it detects.
  • a device for memorizing the vehicle speed when approaching the crossroads By also associating with each repeater station at a crossroads a device for memorizing the vehicle speed when approaching the crossroads, the respective responsibilities of the drivers of each vehicle can be established by accidents at the crossroads, by reading the memories which record information.
  • additional devices are on board the vehicles to indicate to their users what to do.
  • the system described therefore has many advantages over the devices of the prior art. It makes it possible to increase the safety conditions by informing the user that in the case where this is really necessary, and in particular when the obstacle which is in front is a source of real potential danger.
  • this system for the detection of an obstacle other than a vehicle: as has been said. depending on the vehicle being followed, it is possible to issue a specific signal. It is therefore conceivable to use this system for example to inform the user of a particularly dangerous permanent obstacle on the road, for example a very tight turn. In this case, outside the turn, it is enough to place a transmitter system transmitting towards the vehicles approaching the turn and this using a different signal.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Traffic Control Systems (AREA)
EP84401966A 1983-10-03 1984-10-02 System zur Detektion von einem vorbestimmten Hindernis auf dem Weg eines Strassenfahrzeuges Withdrawn EP0136956A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8315696 1983-10-03
FR8315696A FR2558266A1 (fr) 1983-10-03 1983-10-03 Dispositif selectif detecteur d'obstacle pour vehicule

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EP0136956A2 true EP0136956A2 (de) 1985-04-10
EP0136956A3 EP0136956A3 (de) 1985-05-15

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EP84401966A Withdrawn EP0136956A3 (de) 1983-10-03 1984-10-02 System zur Detektion von einem vorbestimmten Hindernis auf dem Weg eines Strassenfahrzeuges

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FR (1) FR2558266A1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2204435A (en) * 1987-04-22 1988-11-09 Dermot Patrick Farrell Vehicle anti-collision system
FR2699467A1 (fr) * 1992-12-21 1994-06-24 Symoens Georges Procédé pour éviter la collision de véhicules automobiles et dispositif pour sa mise en Óoeuvre.
GB2291995A (en) * 1994-08-05 1996-02-07 Friedrich Theodor Meuschke Audio/visual warning system
EP0775921A1 (de) * 1995-11-21 1997-05-28 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Vorrichtung zur Abstandsbestimmung von Fahrzeugen
WO1999031639A1 (en) * 1997-12-13 1999-06-24 Arnold Jameson Warning system for detecting approaching objects
EP0962908A2 (de) * 1998-06-05 1999-12-08 Honda Giken Kogyo Kabushiki Kaisha Detektions und Notifikationssystem von einem bewegenden Objekt
EP0962906A2 (de) * 1998-06-04 1999-12-08 Honda Giken Kogyo Kabushiki Kaisha Spiegel für Kurven mit funkwellenreflektierenden Platten

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2131433A5 (de) * 1971-03-26 1972-11-10 Messerschmitt Boelkow Blohm
FR2159360A1 (de) * 1971-11-11 1973-06-22 Daimler Benz Ag
FR2240492A1 (en) * 1973-08-08 1975-03-07 Gendrot Andre Vehicle accident signalling system - emitts radio signal to warn approaching vehicles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2131433A5 (de) * 1971-03-26 1972-11-10 Messerschmitt Boelkow Blohm
FR2159360A1 (de) * 1971-11-11 1973-06-22 Daimler Benz Ag
FR2240492A1 (en) * 1973-08-08 1975-03-07 Gendrot Andre Vehicle accident signalling system - emitts radio signal to warn approaching vehicles

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2204435A (en) * 1987-04-22 1988-11-09 Dermot Patrick Farrell Vehicle anti-collision system
FR2699467A1 (fr) * 1992-12-21 1994-06-24 Symoens Georges Procédé pour éviter la collision de véhicules automobiles et dispositif pour sa mise en Óoeuvre.
GB2291995A (en) * 1994-08-05 1996-02-07 Friedrich Theodor Meuschke Audio/visual warning system
EP0775921A1 (de) * 1995-11-21 1997-05-28 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Vorrichtung zur Abstandsbestimmung von Fahrzeugen
WO1999031639A1 (en) * 1997-12-13 1999-06-24 Arnold Jameson Warning system for detecting approaching objects
EP0962906A2 (de) * 1998-06-04 1999-12-08 Honda Giken Kogyo Kabushiki Kaisha Spiegel für Kurven mit funkwellenreflektierenden Platten
EP0962906A3 (de) * 1998-06-04 2000-11-15 Honda Giken Kogyo Kabushiki Kaisha Spiegel für Kurven mit funkwellenreflektierenden Platten
US6264334B1 (en) 1998-06-04 2001-07-24 Honda Giken Kogyo Kabushiki Kaisha Road-curve mirror with radio wave reflection plate
US6367936B2 (en) 1998-06-04 2002-04-09 Honda Giken Kogyo Kabushiki Kaisha Road-curve mirror with radio wave reflection plate
EP0962908A2 (de) * 1998-06-05 1999-12-08 Honda Giken Kogyo Kabushiki Kaisha Detektions und Notifikationssystem von einem bewegenden Objekt
EP0962908A3 (de) * 1998-06-05 2000-09-13 Honda Giken Kogyo Kabushiki Kaisha Detektions und Notifikationssystem von einem bewegenden Objekt
US6433705B2 (en) 1998-06-05 2002-08-13 Honda Giken Kogyo Kabushiki Kaisha Movable body detecting/notifying system
US6696975B2 (en) 1998-06-05 2004-02-24 Honda Giken Kogyo Kabushiki Kaisha Movable body detecting/notifying system

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FR2558266A1 (fr) 1985-07-19
EP0136956A3 (de) 1985-05-15

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