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Emissions behaviour of a four cylinder common rail engine burning oxygenated fuels

In the modern common rail engines the oxygen addition is effective in reducing soot. However the soot reduction is sensible only to the oxygen percent and effective only with a fuel oxygen content above 3%. NOx emission is not influenced significantly by fuel quality. HC and CO emissions are reduced when oxygen content increase.

No significant differences can be observed on engine indicated data among the base fuel and the 3 oxygenated fuels. However, the pilot injection activation reduces drastically the ignition delay time, hiding the cetane number influence.

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