Fuel mixture stratification as a method for improving...

Internal-combustion engines – Combustion chamber means having fuel injection only – Combustible mixture stratification means

Reexamination Certificate

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C123S299000, C123S305000

Reexamination Certificate

active

07128046

ABSTRACT:
A method for slowing the heat-release rate in homogeneous charge compression ignition (“HCCI”) engines that allows operation without excessive knock at higher engine loads than are possible with conventional HCCI. This method comprises injecting a fuel charge in a manner that creates a stratified fuel charge in the engine cylinder to provide a range of fuel concentrations in the in-cylinder gases (typically with enough oxygen for complete combustion) using a fuel with two-stage ignition fuel having appropriate cool-flame chemistry so that regions of different fuel concentrations autoignite sequentially.

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Dec, J.E; Sjöberg, M.; “Isolating the Effects of Fuel Chemistry on Combustion Phasing in a HCCI Engine and the Potential of Fuel Stratification for Ignition Control,”2004 SAE World Congress, Detroit, MI, Mar. 8-11, 2004, paper 2004-01-0557.

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