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Project ID: G3RD-CT-1999-00021
Finanziato nell'ambito di: FP5-GROWTH
Paese: Italy

Sensitivity of modern common rail diesel engines

Modern Common Rail Diesel engines, employing pilot and main injection strategy, confirm their little sensitivity in terms of combustion evolution to fuel quality and confirm their tendency to produce low level of unburned emissions. The unburned emissions upstream the catalyst seems mainly ascribed to the presence of a pilot injection, but due to the presence of oxidant catalyst, differences among fuels are smooted.

Nevertheless some trend can be noticed:
The reduction of surface tension slightly reduces smoke emissions, while it produces increases of HC and CO.

Fuel density variation showed a little effect on smoke emission. In particular, the reduction of density produces a decrease on smoke and an increase on unburned emissions (HC, CO).

Viscosity has more or less the same effect of density on all the emissions. In particular decreasing viscosity decreases smoke emissions and HC and CO increases.

The oxygen content of fuels has a positive effect on soot emission reduction while Nox emission slightly rises. No differences were found varying the kind of oxygenated fuel (bio-derived or synthetic).

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