Simulation of atmospheric PAH emissions from diesel engines

Simulation of atmospheric PAH emissions in a typical European passenger car diesel engine at steady conditions or under a certification cycle is made using in-house software. It is based on neural fitting of experimental data from eight different fuels tested under five operating steady conditions ( reproducing modes of the European transient urban/extraurban certification cycle). The software allows the determination of PAH emissions as a functio n of the fuel composition parameters (aromatic content, cetane index, gross heat power, nitrogen and sulphur content) and operation conditions (torque and engine speed). The mathematical model reproduces experimental data wit h a maximum error of 20%. This tool is very useful, since changes in parame ters can be made without experimental cost and the trend in modifications i n PAH emissions is immediately obvious. (C) 2001 Elsevier Science Ltd. All rights reserved.