Fault-tolerant synchronisation device for a real-time...

G - Physics – 06 – F

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G06F 11/16 (2006.01) G06F 1/12 (2006.01) G06F 11/18 (2006.01)

Patent

CA 2433848

The invention enables fault-tolerant synchronisation of real-time equipment (11, 21, 22) connected to a computer network (41) over several tens of metres, with the option of including or not such equipment in the synchronisation device. The invention provides global scheduling of the real-time computer platform in the form of minor and major cycles in order to reduce the waiting time during sensor acquisition, associated calculation and preparation of the output towards the actuator in an integrated modular avionic architecture (IMA). For this purpose, the invention uses a synchronisation bus (61) which is separate from the data transfer network (41) and circuits (113, 213, 223) that interface with said specific bus (61) in order to process the synchronisation signals from the real-time local clocks (112, 212, 222) at each piece of equipment (11, 21, 22) in a fault-tolerant, decentralised manner.

L'invention permet la synchronisation tolérante aux pannes d'équipements temps réel (11, 21, 22) raccordés à un réseau informatique (41) de plusieurs dizaines de mètres avec un choix possible d'inclure ou pas tel équipement au dispositif de synchronisation. Elle permet d'avoir un ordonnancement global de la plate-forme informatique temps réel sous la forme de cycles mineur et majeur pour réduire la latence lors de l'acquisition de senseurs, le calcul associé et l'élaboration de la sortie vers l'actionneur dans une architecture avionique modulaire intégrée (IMA). Elle utilise pour ce faire un bus de synchronisation (61) distinct du réseau de transfert de données (41) et des circuits d'interface (113, 213, 223) avec ce bus spécifique (61) pour traiter de manière décentralisée tolérante aux fautes les signaux de synchronisation des horloges temps réel locales (112, 212, 222) à chaque équipement (11, 21, 22).

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