Comparative Study of Butadiene and B, T, X Tailpipe Emissions for Gasoline of Different Octane Levels

J. Villinger, W. Federer, S. Praun, W. Zeiner, R. Fürbacher, O. Binder, H. Kitzler
2002 SAE Technical Paper Series   unpublished
Real time differentiated hydrocarbon tailpipe emission monitoring on a lambda one controlled vehicle, driven in the NEFZ ("Neuer Europäischer Fahrzyklus") driving cycle on the chassis dynamometer, showed dramatic variations of the concentrations of butadiene and benzene when operated with gasolines of different octane rating. Butadiene as well as benzene emissions were enhanced in 91 octane (RON) fuels compared to 95 and 98 octane fuels, although the aromatics content of RON 91 fuel is
more » ... 91 fuel is significant lower and the content of benzene is equal to the RON 95 fuel. The measured emissions of THC can not reflect these differences whereas cold start behaviors as well as highway driving emissions are derived from the test program. Test results from a 1-cylinder research engine with specific fuel compositions and in cylinder monitoring of differentiated hydrocarbons are the basis of an interpretation of these vehicle test results.
doi:10.4271/2002-01-1643 fatcat:trp53kjakvek5k27oysoaj2opy