Virtual fuel quality sensor

F - Mech Eng,Light,Heat,Weapons – 02 – P

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F02P 5/152 (2006.01) F02D 35/02 (2006.01)

Patent

CA 2633634

A method of operating a multiple combustion chamber internal combustion engine includes advancing an ignition timing of a first subset of the combustion chambers from an operating ignition timing until a knock event is detected while concurrently operating the remaining combustion chambers at the operating ignition timing. A first knock margin of the first subset of combustion chambers is determined in relation to a difference between the operating ignition timing and the ignition timing at the knock event. A characteristic of a fuel supplied to the combustion chambers is determined in relation to at least the first knock margin.

L'invention porte sur un procédé de fonctionnement de moteur à combustion interne à chambres de combustion multiples qui consiste à avancer le moment de l'allumage d'un premier sous-ensemble de chambres de combustion par rapport à un moment d'allumage de commande jusqu'à ce qu'un événement de cliquetis soit détecté, tout en commandant simultanément les chambres de combustion restantes au moment de l'allumage de commande. On détermine une première marge de cliquetis pour le premier sous-ensemble de chambres de combustion sur la base de la différence entre le moment de l'allumage de commande et le moment de l'allumage fondé sur l'événement de cliquetis. On détermine une caractéristique d'un combustible qui alimente les chambres de combustion par rapport à la première marge de cliquetis au moins.

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