Browse Publications Technical Papers 2014-01-1562
2014-04-01

Simulations of the Fuel Economy and Emissions of Hybrid Transit Buses over Planned Local Routes 2014-01-1562

We present simulated fuel economy and emissions of 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 tailpipe (post-aftertreatment) emissions are affected by complex interactions between engine load and the transient catalyst temperatures, and the emissions results were found to depend significantly on motor size and details of each drive cycle.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
We also recommend:
TECHNICAL PAPER

Study of Improvements in NOx Reduction Performance on Simultaneous Reduction System of PM and NOx

2005-01-3884

View Details

TECHNICAL PAPER

Engine-Aftertreatment in Closed-Loop Modeling for Heavy Duty Truck Emissions Control

2019-01-0986

View Details

TECHNICAL PAPER

Transient Particulate Emissions from Diesel Buses During the Central Business District Cycle

960251

View Details

X