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Title: Simulations of the Fuel Economy and Emissions of Hybrid Transit Buses over Planned Local Routes

Abstract

We present simulated fuel economy and emissions city transit buses powered by conventional diesel engines and diesel-hybrid electric powertrains of varying size. Six representative city drive cycles were included in the study. In addition, we included previously published aftertreatment device models for control of CO, HC, NOx, and particulate matter (PM) emissions. Our results reveal that bus hybridization can significantly enhance fuel economy by reducing engine idling time, reducing demands for accessory loads, exploiting regenerative braking, and shifting engine operation to speeds and loads with higher fuel efficiency. Increased hybridization also tends to monotonically reduce engine-out emissions, but trends in the tailpipe (post-aftertreatment) emissions involve more complex interactions that significantly depend on motor size and drive cycle details.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1129607
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
SAE International Journal of Commercial Vehicles
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 1946-3928
Country of Publication:
United States
Language:
English

Citation Formats

Gao, Zhiming, LaClair, Tim J, Daw, C Stuart, Smith, David E, and Franzese, Oscar. Simulations of the Fuel Economy and Emissions of Hybrid Transit Buses over Planned Local Routes. United States: N. p., 2014. Web. doi:10.4271/2014-01-1562.
Gao, Zhiming, LaClair, Tim J, Daw, C Stuart, Smith, David E, & Franzese, Oscar. Simulations of the Fuel Economy and Emissions of Hybrid Transit Buses over Planned Local Routes. United States. doi:10.4271/2014-01-1562.
Gao, Zhiming, LaClair, Tim J, Daw, C Stuart, Smith, David E, and Franzese, Oscar. Wed . "Simulations of the Fuel Economy and Emissions of Hybrid Transit Buses over Planned Local Routes". United States. doi:10.4271/2014-01-1562.
@article{osti_1129607,
title = {Simulations of the Fuel Economy and Emissions of Hybrid Transit Buses over Planned Local Routes},
author = {Gao, Zhiming and LaClair, Tim J and Daw, C Stuart and Smith, David E and Franzese, Oscar},
abstractNote = {We present simulated fuel economy and emissions city transit buses powered by conventional diesel engines and diesel-hybrid electric powertrains of varying size. Six representative city drive cycles were included in the study. In addition, we included previously published aftertreatment device models for control of CO, HC, NOx, and particulate matter (PM) emissions. Our results reveal that bus hybridization can significantly enhance fuel economy by reducing engine idling time, reducing demands for accessory loads, exploiting regenerative braking, and shifting engine operation to speeds and loads with higher fuel efficiency. Increased hybridization also tends to monotonically reduce engine-out emissions, but trends in the tailpipe (post-aftertreatment) emissions involve more complex interactions that significantly depend on motor size and drive cycle details.},
doi = {10.4271/2014-01-1562},
journal = {SAE International Journal of Commercial Vehicles},
issn = {1946-3928},
number = 1,
volume = 7,
place = {United States},
year = {2014},
month = {1}
}