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Comparison Study on the Urban Transportation Fuel Consumption and GHG Emission Using Real-world vs. MOBILE6 and MOVES Estimations for Gasoline and Hybrid Electric Vehicles

Abstract

This work presents a methodology to compare vehicle fuel consumption and GHG emissions from real-world in-use testing with EPA MOBILE 6 and MOVES (MOtor Vehicle Emission Simulator) estimations. For this study, fuel consumption data in real-world driving conditions from a sample of 74 instrumented vehicles is used, 21 of which are HEVs. Fuel consumption from the vehicles during the testing were recorded, analyzed, and compared to estimated emissions using the current EPA emissions estimation model, MOtor Vehicle Emission Simulator (MOVES) and MOBILE6. The authors observed discrepancies between the measured data and these estimates, especially when associated with cold-start emissions. More detailed analysis results, along with the detailed test methodologies, are provided in this paper. Among other results, the beneficial fuel efficiency merits of hybrid vehicles are demonstrated in particular in low speeds in urban (city) driving conditions. There is discrepancies between MOVES and MOBILE6, and real-world estimations in lower speeds. At speeds lower than 20km/hr the fuel consumption curves of the two former methods are slightly higher than the latter. However the former mentioned methods don’t consider cold-start emissions. The average GHG emission obtained from MOVES and MOBILE6 are slightly higher than estimations based on real-world fuel consumption curves.

Conference Paper Details

Session title:
Risk Assessment and Vulnerability of Mobility
Author(s):
Zahabi, S.A.H.
Miranda-Moreno, L.F.
Barla, P.
Vincent, B.
Topics:
Climate change
Year:
2015