Variable ethanol octane enhancement of gasoline engines

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

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F02B 75/12 (2006.01)

Patent

CA 2588385

Fuel management system for efficient operation of a spark ignition gasoline engine. Injectors inject an anti-knock agent such as ethanol directly into a cylinder of the engine. A fuel management microprocessor system controls injection of the anti-knock agent so as to control knock and minimize that amount of the anti-knock agent that is used in a drive cycle. It is preferred that the anti-knock agent is ethanol. The use of ethanol can be further minimized by injection in a non-uniform manner within a cylinder. The ethanol injection suppresses knock so that higher compression ratio and/or engine downsizing from increased turbocharging or supercharging can be used to increase the efficiency of the engine.

L'invention concerne un système de gestion de carburant permettant un fonctionnement efficace d'un moteur à essence à explosion. Des injecteurs injectent un agent anti-détonant, tel que de l'éthanol, directement dans un cylindre du moteur. Un système de microprocesseur de gestion de carburant commande l'injection de l'agent anti-détonant, de manière à prévenir la détonation et réduire au minimum la quantité d'agent utilisée dans un cycle d'entraînement. L'agent anti-détonant est de préférence de l'éthanol. L'utilisation de l'éthanol peut être encore réduite au minimum par l'injection de manière non homogène dans un cylindre. L'injection d'éthanol supprime la détonation, si bien qu'un rapport de compression supérieure et/ou la réduction de la cylindrée par rapport à la turbocompression ou la suralimentation accrue peuvent être utilisés pour augmenter l'efficacité du moteur.

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