In railway train-borne equipment, the Driver Machine Interface (DMI) acts like a bridge between the train driver and the onboard automatic train control system (European Vital Computer, EVC). While the DMI is required to operate in a critical context, current DMIs have no safety requirements. This implies that the EVC may automatically stop the train whenever the DMI is suspected to misbehave, leading to delay of the train, inconvenience for passengers and consequent possible profit loss. For these reasons a DMI with higher safety requirements is worth to be taken into account, even if it implies higher costs. The SAFEDMI European project aims at developing (i) a DMI at Safety Integrity Level 2 (SIL 2) using off-the-shelf components and a simple hardware architecture to reduce costs, and (ii) a SIL 2 wireless communication support for maintenance. This paper describes the architecture of a DMI which satisfies these objectives. The main hardware and software characteristics will be shown, including the proposed error detection techniques and the related fault handling (characterized by a new operational mode that allows DMI to restart silently, thus reducing unexpected train stops).
Abstract-Experimental evaluation is aimed at providing useful insights and results that constitute a confident representation of the system under evaluation. Although guidelines and good practices exist and are often applied, the uncertainty of results and the quality of the measuring system is rarely discussed. To complement such guidelines and good practices in experimental evaluation, metrology principles can contribute in improving experimental evaluation activities by assessing the measuring systems and the results achieved. In this paper we present the experimental evaluation by software-implemented fault injection of a safe train-borne Driver Machine Interface (DMI), to evaluate its behavior in presence of faults. The measuring system built for the purpose and the results obtained on the assessment of the DMI are scrutinized along basic principles of metrology and good practices of fault injection. Trustfulness in results has been estimated satisfactory and the experimental campaign has shown that the safety mechanisms of the DMI correctly identify the faults injected and that a proper reaction is executed.
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