EXPERIMENTAL ANALYSIS OF EMISSION DETERIORATION FACTORS FOR LIGHT DUTY CATALYTIC VEHICLES. CASE STUDY: SANTIAGO, CHILE

One of the most influential variables for emission deterioration factors is the state of vehicle maintenance, which will vary depending upon local conditions and therefore is location-specific. This study seeks to determine emission deterioration factors specific to the conditions of the vehicle fleet in Santiago, Chile. Deterioration factors are obtained from three-way catalyst light passenger vehicles in Santiago based on experimental data collected from chassis dynamometer tests. Emission deterioration factors related to speed and accumulated mileage are obtained for total hydrocarbons (THC), carbon monoxide (CO) and nitrogen oxides (NOx). The model developed here predicts a greater deterioration rate of THC and NOx emissions as mileage increases compared to the emission deterioration rate for CO. Emission deterioration for THC and CO shows a peak around the average speed of 50 km/h as mileage increases. The NOx emission deterioration shows a sustained upward trend with speed and with mileage. Comparing these results with results obtained from the European COPERT model and the U.S. AP-42 model shows that the deterioration factors found by applying the new model exceeded those deterioration factors found by applying the AP-42 and COPERT models. The CO emission deterioration factors were approximately 1.2 times greater. In the cases of THC and NO, the results were over 2 times the results obtained by the AP-42 and COPERT model.

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  • English

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  • Accession Number: 00960776
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 15 2003 12:00AM