Internal-combustion engines – Spark ignition timing control – Electronic control
Reexamination Certificate
2007-08-17
2010-06-22
McMahon, M. (Department: 3741)
Internal-combustion engines
Spark ignition timing control
Electronic control
Reexamination Certificate
active
07740004
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.
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Bromberg Leslie
Cohn Daniel R.
Heywood John
Massachusetts Institute of Technology
McMahon M.
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