Modeling Vehicle Emissions in Hot-Stabilized Conditions Using a Simultaneous Equations Model

Authors

Hualiang (Harry) Teng, University of Nevada, Las VegasFollow
Yi (Grace) Qi, University of VirginiaFollow
Joon H. Byun, Air Quality Modeling Specialist, Resource Center at Baltimore
Yuko Nakanishi, Urban ITS Center, Polytechnic University
David E. James, University of Nevada, Las VegasFollow

Document Type

Article

Publication Date

10-1-2005

Publication Title

Journal of Transportation Engineering

Volume

131

Issue

10

First page number:

762

Last page number:

770

Abstract

The purpose of this study is to incorporate the correlation between different types of emissions into microscale vehicle emissions models. Simultaneous equations models were calibrated for two vehicle categories classified in a National Cooperative Highway Research Program project. One represents normal emitting vehicles, while the other represents high emitting vehicles. Among various vehicle operation conditions, only those represented by Bag 2 of the Federal Test Procedure cycle were considered in this study. The developed models were evaluated based on the criteria of root mean square errors and correlation coefficients between the estimated and measured emissions. The results indicate that the correlation between emissions of CO and HC can be significantly identified; thus, these two emission types should be included in the simultaneous equations models. In addition, the results indicate that simultaneous equations models can achieve better and reliable emissions estimation results compared with other vehicle emissions models, which implies that it is worthwhile to apply simultaneous equations models to other operation conditions.

Keywords

Automobiles; Automobiles--Motors--Exhaust gas; Automobiles--Pollution control devices; Carbon monoxide; Hydrocarbons

Disciplines

Civil and Environmental Engineering | Civil Engineering | Environmental Engineering | Environmental Health and Protection | Structural Engineering

Language

English

Permissions

Use Find in Your Library, contact the author, or interlibrary loan to garner a copy of the item. Publisher policy does not allow archiving the final published version. If a post-print (author's peer-reviewed manuscript) is allowed and available, or publisher policy changes, the item will be deposited.

Repository Citation

Teng, H. (., Qi, Y., Byun, J. H., Nakanishi, Y., James, D. E. (2005). Modeling Vehicle Emissions in Hot-Stabilized Conditions Using a Simultaneous Equations Model. Journal of Transportation Engineering, 131(10), 762-770.
http://dx.doi.org/10.1061/(ASCE)0733-947X(2005)131:10(762)