Browse Publications Technical Papers 2003-01-3167
2003-10-27

The Effect of Sulphur-Free Diesel Fuel on the Measurement of the Number and Size Distribution of Particles Emitted from a Heavy-Duty Diesel Engine Equipped with a Catalysed Particulate Filter 2003-01-3167

Following concern about the association between adverse health effects and ambient particulate concentrations, there are now an increasing number of heavy-duty Diesel engines fitted with catalysed particulate filters. These filters virtually eliminate carbon particle emissions but there is some evidence suggesting a potential to form a cloud of secondary nucleation particles post trap. This event occurs at high temperature operating conditions and is produced mainly from the increased sulphate production over the catalyst. This paper investigates the measurement of particle emissions from a heavy-duty engine operating over the European legislated cycle, both with and without a filter fitted and investigates how emissions are affected by the use of a sulphur-free Diesel fuel. The work also demonstrates a contribution to the measured nucleation particles from material desorbed not only from the trap, but also from the exhaust system.

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