Integrated on-board information system

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IBIS user interface (Trapeze ITS IBISplus)

An integrated on-board information system ( IBIS ) is an on-board computer with a bus system in public transport. It coordinates all functions of the computer-aided operations control system in the vehicle and primarily controls the passenger information system . In further expansion stages, the IBIS can also be used for the exchange of information between drivers and the operations control center (BLS). IBIS is documented in publications of the VDV (formerly VÖV). The original description dates from 1984 and was changed or supplemented in 1987 and 1991.

technical description

The IBIS of a vehicle consists of the central device , which controls the connected peripheral devices via a vehicle bus . All data required for operation are stored in the IBIS, so the system also works autonomously if there is no radio coverage. Newer IBIS devices support the BLIS information system for the blind and can be supplied with a large number of additional data and transmit these to the BLS, provided the vehicle has the appropriate interfaces. This includes, for example, the location of the vehicle, the destination, the occupancy and the current speed. The BLS, in turn, can transmit acoustic or visual messages directly to a specific vehicle or to all vehicles on a line, such as schedule deviations, operational instructions and information about technical faults. Examples of peripheral devices are:

  • Validator
  • Ticket machines
  • Passenger information system (line indicator, destination indicator, stop indicator, stop announcement)
  • Passenger counting system
  • Stop request button
  • Message transmission from the infrastructure to the vehicle
  • technical error recording
  • remote driver terminal for bidirectional vehicles
  • Control of the infrastructure: Influence of track infrastructure, such as traffic signals (traffic lights and signals), barriers (Bus) or switches (tram)
  • Positioning device: The position of the vehicle is determined by means of infrared beacons and / or GPS , whereby the driver and BLS are always informed about deviations from the timetable.

The trolley BUS is implemented via a four-wire line with which all peripheral devices are connected in parallel with the central device. Two wires each form a request bus (central device → peripheral device) and a response bus (peripheral device → central device). All equipment is on the request bus by polling polled six times per minute. The data records are made up of ASCII characters and begin with an identifier that describes the address of the recipient or the type of data record, and ends with a carriage return character (CR).

In addition to internal vehicle communication, several central units can communicate via a train bus. The central device of the leading vehicle takes over the control of the bus, which is referred to as the master status. The other central devices fall into a so-called slave state. In contrast to the coach BUS, the train BUS works with a higher signal level to ensure reliable data transmission via coupling contacts. In order to recognize the position and the wagon numbers of the individual vehicles in the train set, the train BUS has an additional address assignment procedure. Furthermore, by streamlining the data traffic, it is possible to operate the train bus in simplex mode. The train bus needs two data lines. The master central device controls the slave central devices via the train bus, which in turn control the connected peripheral devices via the car bus.

Application in rail transport

At Deutsche Bahn , lines 17 and 18 of the UIC cable are used for the train bus for single-type passenger train sets. Since these lines are actually reserved for the Wire Train Bus (WTB), vehicles using the train bus cannot use the WTB. The central devices used in the vehicles with a driver's cab (e.g. locomotives and control cars) are equipped with an electro-acoustic system (ELA) which outputs the automatic and manual announcements via the loudspeakers of the train set. The audio signals are transmitted via lines 1 to 8 of the UIC cable.

future

In autumn 2010, the VDV started the research and standardization project Internet protocol- based communication services in public transport (IP-KOM-ÖV) with the aim of creating a new, future standard. This was implemented with the publication of VDV Merkblatt 301 in 2014.

literature

  • Association of public transport companies (Ed.): Integrated on-board information system (IBIS) ; VÖV writings, series technology VÖV 04.05.4 edition June 1984
  • Association of public transport companies (publisher): Integrated on-board information system (IBIS), changes / additions to the June 1984 edition ; VÖV writings, series technology VÖV 04.05.4 edition August 1987
  • Association of German Transport Companies (Ed.): Integrated On-Board Information System (IBIS), Supplement 2 ; VDV publications 300 7/91

Individual evidence

  1. ↑ a b c d Integrated On-Board Information System (IBIS) . In: Association of German Transport Companies (Hrsg.): VDV writings . tape 300 , 1992.
  2. ↑ Telegram comparison table IBIS to IBIS-IP. VDV, accessed on October 4, 2019 .
  3. ↑ Internet protocol based integrated on-board information system IBIS-IP. VDV, accessed on October 4, 2019 .