Patent Number: 7,762,233

Title: Fuel management system for variable ethanol octane enhancement of gasoline engines

Abstract: 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.

Inventors: Cohn; Daniel R. (Chestnut Hill, MA), Bromberg; Leslie (Sharon, MA), Heywood; John B. (Newton, MA)

Assignee: Massachusetts Institute of Technology

International Classification: F02B 7/02 (20060101); F02B 13/00 (20060101); F02M 25/14 (20060101)

Expiration Date: 7/27/12018