Fuel management system for variable ethanol octane...

Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters

Reexamination Certificate

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C123S435000, C123S406290

Reexamination Certificate

active

10991774

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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