DIESEL UNREGULATED EMISSIONS CHARACTERIZATION

CRC Project No. E-75-2

Leaders:          J. C. Ball
                        N. J. Barsic

Scope and Objective

This project builds upon the database from Project E-75. The objective is to mine this database to develop average emission rates of air toxics and other compounds of interest for various diesel vehicle classes.  It is recognized that there has been little coordination between studies regarding driving cycles, fuels, lubricants, measurement methods, and diesel vehicle classes.  In addition, the database contains emission rates for both engine dynamometer and chassis dynamometer studies.  The goal is to examine the various studies and to determine what data can logically be grouped together, considering both the variables mentioned above and other complicating factors, such as vehicles built to different emission standards and malfunctioning vehicles.

Current Status and Future Program

It is anticipated that broad definitions of emission categories will have to be accepted with results presented as averages, means, and ranges.  Large numbers of compounds have been measured in some studies.  The first priority is to choose those compounds that are commonly present in diesel exhaust and have been characterized as possible air toxics.  CARB’s list of 41 Air Toxic Contaminants and EPA’s mobile source air toxics documents will be used as guides.

One anticipated use of the results of this program is to compare current on-road, HHDD diesel truck unregulated emissions from properly functioning engines or vehicles to the emissions from engines that are compliant with the 2007 HD emissions certification standards. 

E.H. Pechan was selected for this project through a competitive solicitation. The project is expected to continue through the end of 2008.

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