Authors: Delia Ajtay, Martin Weilenmann
Addresses: Section of Internal Combustion Engines/Furnaces, Swiss Federal Laboratories for Materials Testing and Research (EMPA), Ueberlandstrasse 129, 8600 Duebendorf, Switzerland. ' Section of Internal Combustion Engines/Furnaces, Swiss Federal Laboratories for Materials Testing and Research (EMPA), Ueberlandstrasse 129, 8600 Duebendorf, Switzerland
Abstract: Emission models can be categorised into three categories: average speed models; traffic situation models, used at macro-scale or meso-scale level (national, regional, city level); and instantaneous (modal) models, useful at micro-scale level (street, vehicle level). To improve the existing instantaneous emission models, some preconditions must be fulfilled: the emission signals should be measured on a 10 Hz basis, due to their frequency content. Additionally, the transport dynamics from the engine to the analysers must be compensated by time-varying approaches. With these preconditions fulfilled, a new static instantaneous emission model is developed and the improvement in quality is checked by comparing it statistically with older models. A dynamic instantaneous model, able to include the transient generation of emissions, is subsequently created and the quality of prediction of engine-out emissions is determined. When a catalyst model is added, more accurate predictions of emissions for vehicles with after-treatment systems should be obtained.
Keywords: instantaneous emission modelling; modal emission modelling; dynamic emissions mapping; emission factors; vehicle modes; catalyst; vehicle emissions.
International Journal of Environment and Pollution, 2004 Vol.22 No.3, pp.226 - 239
Published online: 19 Oct 2004 *Full-text access for editors Access for subscribers Purchase this article Comment on this article