Passenger car pollutant emissions and fuel consumption are usually assessed as a function of average speed. Several attempts have been made to take into account the driving pattern using emission vs. instantaneous speed and acceleration models. Five similar models were developed in Europe. In this paper, the various development stages of an emissions-based model and the associated errors are presented. Analysis was performed using the Modem model, developed from the measurement results obtained over a sample of 150 vehicles from European fleets under urban conditions. Average emissions as measured over 14 representative driving cycles are compared to emissions calculated over same cycles using this model. Modeling errors ranged from -51% to +57% as a function of the considered cycle and vehicle type; quite similar for the other 4 European models. In a second step, a number of alternatives liable to improve the reliability of instantaneous models are considered; this does not greatly improve the model reliability. Limited measurements performed on a catalyst vehicle demonstrated that very high engine loads, even if not frequent, play a significant role in emissions.

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    Radarweg 29
    Amsterdam,   Netherlands  1043 NX
  • Publication Date: 1999-9


  • English

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  • Accession Number: 00798731
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 14 2000 12:00AM