Quantifying Fuel Consumption and Emission Saving of Hybrid Vehicles over Gasoline in Real Traffic
Loading...
Date
2022-05
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
The Ohio State University
Abstract
Roadway vehicle emissions are a primary cause of greenhouse gas. The CO2 emissions of a conventional automobile are directly related to the amount of gasoline it consumes, and the fuel consumption increases with acceleration. This thesis seeks to quantify the potential fuel and emissions savings provided by hybrid automobiles in real traffic conditions. To date, quantifying vehicle emissions in actual traffic has been hampered by the difficulty of measuring vehicle acceleration. This work uses recent developments in LIDAR data processing to collect vehicle acceleration data in actual traffic and then uses the Comprehensive Modal Emission Model (CMEM) to compare the resulting fuel consumption and emissions from gasoline and hybrid vehicles under the same conditions from the actual vehicle trajectories. While assessing the CMEM model's fuel consumption against real data from standardized fuel efficiency tests, this research found that the CMEM overestimated the hybrid fuel consumption, so this thesis adopts the CMEM output as the upper limit for hybrid fuel consumption and developed adjustments to establish a lower limit. Using the standard CMEM model hybrid vehicles showed lower fuel consumption and emissions than pure gasoline vehicles under the exact same driving condition. However, the hybrid did not perform significantly better. With the adjustments to the CMEM model this research found that hybrid vehicles show larger improvements over gasoline vehicles. This research also studied the fuel and emissions performance as a function of the vehicle locations on the road and their relationship with the time spent idling due to traffic signals. The hybrid fuel savings were between 22% (CMEM hybrid) and 49% (modified CMEM hybrid). We were not able to assess CMEM hybrid for emissions so only the normal CMEM model was used for emissions. In this case the CMEM hybrid vehicle reduced CO2 by 21%, NOx by 74%, HC by 91% and CO by 94% for the empirical trajectory data.
Description
Keywords
Vehicle emissions, Hybrid vehicles, Empirical study, Gasoline vehicles