During a long time regulated as well as unregulated automobile exhaust emissions have been measured at the Automobile Exhaust Emissions Laboratory. Among the unregulated, NO(sub 2) has been measured. As NO(sub 2) is the most harmful nitrogen oxide to man as well as to nature and materials, it is considered important to report results from both published and unpublished emission tests. Passenger cars are included as well as heavy trucks and buses with diesel engines. Some literature background is also included. The results show that the fraction of NO(sub 2) is 5-10% of the NO(sub x)-emission, but, at low road, at high excess air, with certain filter/catalysts and from a diesel passenger car, the NO(sub 2)-fraction can amount to 25 to almost 100%. For gasoline fueled passenger cars conforming to Swedish A10-regulations (US-72/73) it can be seen strong negative correlation between fuel consumption per time unit and the percentage of NO(sub x) being NO(sub 2). This means that high loads are associated with low NO(sub 2) fractions and idle, light cruising and decellerations give low fractions of NO(sub 2). For other cars and parameters correlations are low or not existing. It is recommended that NO(sub 2)-measurements should always be included when testing filters/catalysts on heavy diesel engines. It is further recommended to perform a broader study of passenger diesel cars. A last study area to be included in comming research programmes is the NO(sub 2)-emissions from catalysts equipped cars running, at least part time, in lean burn mode. (ERA citation 15:035812)
Utslaepp av kvaevedioxid (NO2) fraan personbilar, lastbilar och bussar. (Discharge of nitrogen dioxide (NO2) from automobiles, trucks, and buses)
1987
98 pages
Report
Keine Angabe
Englisch
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