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TRANSIT BUS LOAD-BASED MODAL EMISSION RATE MODEL DEVELOPMENT
Citation:
FENG, C., R. GUENSLER, AND M. RODGERS. TRANSIT BUS LOAD-BASED MODAL EMISSION RATE MODEL DEVELOPMENT. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-07/106 (NTIS PB2008-108876), 2007.
Impact/Purpose:
The major effort of this research is to develop a new heavy-duty vehicle load-based modal emission rate model that overcomes some of the limitations of existing models and emission rates prediction methods. This model is part of the proposed Heavy-Duty Diesel Vehicle Modal Emission Modeling (HDDV-MEM) which was developed by Georgia Institute of Technology (Guensler, et al. 2006). HDDV-MEM differs from other proposed HDDV modal models (Barth, et al. 2004; Frey, et al. 2002; Nam 2003) in that the modeling framework first predicts second-by-second engine power demand as a function of vehicle operating conditions and then applies brake-specific emission rates to these activity predictions.
Description:
Heavy-duty diesel vehicles (HDDVs) operations are a major source of oxides of nitrogen (NOx) and particulate matter (PM) emissions in metropolitan area nationwide. Although HD¬DVs constitute a small portion of the on-road fleet, they typically contribute more than 45% of NOx and 75% of PM on-road mobile source emissions. In current regional and microscale modeling conducted in every state except California, HDDV emissions rates are taken from the U.S. Environmental Protection Agency's (EPA's) MOBILE 6.2 model. The major effort of this research is to develop a new heavy-duty vehicle load-based mod¬al emission rate model that overcomes some of the limitations of existing models and emission rates prediction methods.