Modelling of pollutant emissions during cold start for road vehicles

After an inquiry to 39 European laboratories, 15 500 measurements (1 measur ement corresponds to 1 vehicle, 1 normalized or representative cycle and 1 pollutant) concerning 661 vehicles were analysed in order to modellize the pollutant overemission (CO2, CO, HC, NOx) during cold start and fuel overco nsumption. Using these data, we propose an equation describing the relation between overemission and the following parameters: technology (diesel, cat alyst and conventional cars), average speed, ambient temperature and travel led distance. The obtained data were measured for passenger cars and an ext ension to duty vehicles proposed. The model is a part of an emission invent ory model.