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AssigneeMassachusetts Institute of Technology
InventorsDaniel R. Cohn, Leslie Bromberg, John B. Heywood
Estimating the term…
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.
1-56. (canceled)
A turbocharged or supercharged spark ignition engine which is fueled with gasoline and ethanol where ethanol is introduced into the engine in such a way that the vaporized cooling provided by the ethanol enhances the octane number more than it is enhanced by the intrinsic octane number of the ethanol.
A turbocharged or supercharged spark ignition engine where ethanol is introduced into the engine in such a way that it provides a 35 octane number increase over gasoline and the octane number increase from vaporization cooling is greater than the octane number increase from the intrinsic octane of ethanol.
Dependencies are inferred from the claim text.