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AssigneeMassachusetts Institute of Technology
InventorsDaniel R. Cohn, John B. Heywood, Leslie Bromberg
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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.
A spark ignition engine where a first fuel is introduced into the engine by a first fuel injector and a second fuel is introduced into the engine by a second fuel injector where the second fuel has a higher octane number than the first fuel and where the second fuel is introduced into the engine by a second fuel injector that introduces at least some of the second fuel as a liquid into a least one engine cylinder;
Dependencies are inferred from the claim text.