Abstract
The Odometric Safety Control Unit is a system installed aboard every train which supplies this train with highly accurate position and speed data. The system was designed in two phases: a feasibility study (definition of the measurement and processing architecture) and the development of prototypes. The Odometric Safety Control Unit includes radars, a phonic wheel and repositioning beacons. This structure can be adapted for all the rolling stock and railroad network. The heart of the Odometric Safety Control Unit consists of a safety-oriented computer designed by TECHNICATOME. It is the result of 10 years of experience in the field of digital command-control systems piloting nuclear reactors. Basically, it is structured around a monoprocessor and a dual software; its unpredictable failure rate is 10-9 failures/hour. This performance can be achieved owing to a coherent and complementary set of hardware and software techniques which are implemented according to a pre-defined technology. The safety demonstration is based on the automatic fault-injection technique applied to the computer (hardware and software). Millions of failures were studied during fault-injection campaigns for which TECHNICATOME developed a specific methodology and special tools.
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