Classifications

• • 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
  • G08G1/096775—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 central station
• • G—PHYSICS
  • G08—SIGNALLING
  • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
  • G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
  • G08C23/04—Non-electrical signal transmission systems, e.g. optical systems using light waves, e.g. infrared
• • G—PHYSICS
  • G08—SIGNALLING
  • G08G—TRAFFIC CONTROL SYSTEMS
  • G08G1/00—Traffic control systems for road vehicles
  • G08G1/09—Arrangements for giving variable traffic instructions
  • G08G1/095—Traffic lights

Definitions

• the invention relates to a data transmission device for traffic control and traffic information systems according to the preamble of claim 1.
• a traffic control system is known from EP-A-0 25 64 83 in which control information about vehicles is transmitted.
• the infrastructure for such a traffic information system is to be created with as little effort as possible, for example by using existing traffic signal computers for light signaling controls.
• a transmitting and receiving device a so-called beacon
• a so-called beacon to the light signal mast, which involves effort and connection work and costs.
• different techniques for operating the light signal transmitter and the transmitting and receiving devices are necessary.
• incandescent lamp in front of which a colored filter plate is arranged.
• the effect is known that, due to the light conditions in the surroundings, the colored filter plate appears to shine even when the incandescent lamp is switched off, ie it is not clear whether the corresponding signal is switched on or off.
• incandescent lamps emit light in a broadband radiation spectrum and only a small percentage is filtered out in the desired color, and consequently only a fraction of the energy used is used.
• the object of the invention is to develop a data transmission device in light signal transmitters, which is suitable both as a signal transmitter and for the transmission of data and uses a control technology with current pulses in the high frequency range for both functions.
• the object is achieved according to the invention in a data transmission device of the type mentioned at the outset by using a light-emitting diode matrix as the signal unit, with the characterizing features of claim 1.
• LEDs can be controlled separately.
• An advantage of this arrangement compared to the conventional implementation of signal generators with unpulsed or low-frequency power supply and transmission devices with high-frequency control is the common operating technology that is now possible, since both types of diodes are operated with current pulses in the high-frequency range. This makes it easier to regulate the light output emitted in the visible range, while the pulses of the diodes emitting in the infrared range can be encoded for information transmission.
• the data can be transmitted from the central traffic computer to the transmitting unit by cable, by infrared transmission or by radio transmission.
• the yellow light of a red-yellow-green light signal transmitter is formed by a light-emitting diode matrix composed of yellow-emitting light-emitting diodes and infrared diodes. Such an arrangement can then be easily integrated into existing light signal transmitters.
• photodiodes are also integrated into the light-emitting diode matrix in order to be able to receive signals from road users and to forward them to the traffic control center.
• FIG. 1 shows a front view of a red-yellow-green light signal transmitter with a light-emitting diode matrix
• FIG. 2 shows a cross section through a red-yellow-green light signal transmitter with a light-emitting diode matrix with a schematic circuit arrangement, the control signals being transmitted via cable
• FIG. 3 shows a cross section through a red-yellow-green light signal transmitter with a light-emitting diode matrix with wireless transmission of the Control signals
• Figure 4 shows a cross section through a red-yellow-green light signal transmitter with a light-emitting diode matrix with a wireless transmission and the additional installation of photodiodes.
• FIG 1 shows the front view of a red-yellow-green light signal transmitter LS.
• Red light RL and green light GL are realized, as is known, by an incandescent lamp with a filter disk and are only shown schematically.
• the yellow light consists of a light-emitting diode matrix, which consists of a large number Light-emitting diodes SIL (typically 300-500) and a number of infrared light-emitting diodes IRL (typically 60-100).
• FIG. 2 shows schematically in cross section that the yellow-emitting light-emitting diodes SIL are connected together to an electronic control ES, which is connected to a traffic control center VLZ via a control unit SE. Red light RL and green light GL are also connected to the traffic control center VLZ via the control unit SE.
• the diodes IRL emitting in the infrared range are connected to a further control IS, which in turn is connected to the control unit SE via data lines DL and receives the signals to be transmitted from the traffic control center VLZ.
• the electronic control ES and the further control IS can advantageously be implemented using a common technique (for example a common ASIC).
• FIG. 3 shows schematically in cross section how in the embodiment according to FIG. 2 the transmission of the data from the control unit SE to the further control IS of the diodes emitting in the infrared range is carried out by wireless transmission.
• both the further controller IS are connected to a transmitting and receiving unit SIS and the control unit SE is connected to a further transmitting and receiving unit SSE. Both transmitter and receiver units can now communicate with each other either by radio or infrared transmission.
• FIG. 4 the embodiment according to FIG. 3 has been expanded in such a way that additional photodiodes PD are integrated into the light-emitting diode matrix, which can receive signals from the vehicles and, via an additional control PS and the transmission and receiving unit SIS are connected to the control unit SE and thus the traffic control center VLZ.

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

Applications Claiming Priority (3)

Publications (2)

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ID=7820785

Family Applications (1)

Country Status (4)

Families Citing this family (2)

Family Cites Families (8)

• 1998
  • 1998-02-13 WO PCT/DE1998/000435 patent/WO1998037529A1/fr not_active Ceased
  • 1998-02-13 EP EP98912231A patent/EP0962006B1/fr not_active Expired - Lifetime
  • 1998-02-13 DE DE59801633T patent/DE59801633D1/de not_active Expired - Fee Related
  • 1998-02-13 AT AT98912231T patent/ATE206551T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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