Automatic Train Controller Safety Simulation
Author(s)
R. A. V. Gimenes, J. R. de Almeida Jr. & T. R. Nogueira
Abstract
Nowadays, we are observing an increased demand for better and safer mass
transport systems. The supervision and control of these systems is made through
an architecture known as Automatic Train Controller (ATC). The use of
processors in ATC provides new challenges in a safety analysis. A typical
railway system has a Speed-Distance Profile Generator that determines the
maximum allowed speed in each track circuit. Dangerous situations are verified
through the relative positioning and speeds between trains, switching machine
positioning and other restrictions from operational commands generated by the
ATC. Independent Safety Auditors should consider the failure modes of
hardware and software in use. The safety analysis should consider alternative
techniques to complete the complex task of evaluating how safe is the use of the
processor and its associated software. Therefore, the use of simulation can
improve and increase safety analysis, searching for fault states that could not be
found in a static analysis. The main goal of this paper is to describe the
development of a tool that simulates the behaviour of trains’ movement in a
subway system, with boolean expressions. The set of boolean expressions
coordinates all the movements in a subway line and the simulation provides the
possibility to find out lack of safety, considering different combinations in those
boolean expressions. Another important goal is to simulate equipment faults in
order to investigate problems not visible in a static analysis or even in a practical
field test. Preliminary results have shown that the use of a simulator to execute
boolean expressions offers a great variety of tests, allowing the detection of
unsafe situations, complementing software tests validation in a final release.
Through simulation, it is possible to observe the behaviour of simulated objects
in specific internal points which improves the completeness in safety analysis.
Keywords: railway system, environment, safety, simulation, automation,
modelling, boolean expression, microprocessor.
Keywords
railway system, environment, safety, simulation, automation,
modelling, boolean expression, microprocessor.
Related Book
Other papers in this volume
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