COMPARATIVE FIELD EVALUATION OF VEHICLE CRUISE SPEED AND ACCELERATION LEVEL IMPACTS ON HOT STABILIZED EMISSIONS

This study evaluates the impact of vehicle cruise speed and acceleration levels on vehicle fuel consumption and emission rates using field data gathered under real-world driving conditions. A second objective of the study is to validate the VT-Micro model for modeling real-world conditions. An on-board emission-measurement device was used to collect emissions of oxides of nitrogen, hydrocarbons, carbon monoxide and carbon dioxide using a light-duty test vehicle. The analysis demonstrates that vehicle fuel consumption and emission rates per-unit distance are optimum in the range of 60-90 km/h, with considerable increase outside this optimum range. The study demonstrates that as the level of aggressiveness for acceleration maneuvers increases, the fuel consumption and emission rates per maneuver decrease because the vehicle spends less time accelerating. However, when emissions are gathered over a sufficiently long fixed distance, fuel consumption and mobile source emission rates per-unit distance increase as the level of acceleration increases because of the history effects that accompany rich-mode engine operations. The validity of the VT-Micro framework is demonstrated for modeling steady-state vehicle fuel consumption and emission behavior by comparing estimates from the framework against in-field measurements. However, findings also indicate that the VT-Micro framework requires further refinement to capture non-steady-state history behavior when the engine operates in rich mode. The model is being enhanced to incorporate these history effects.

• Record URL:
  http://www.sciencedirect.com/science/article/B6VH8-4DMW3J2-1/1/af24e4744c79d8602cd9ce5621d6cf69
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/13619209
• Corporate Authors:

  Elsevier

  The Boulevard, Langford Lane
  Kidlington, Oxford  United Kingdom  OX5 1GB
• Authors:
  • El-Shawarby, I
  • Ahn, K
  • Rakha, H
• Publication Date: 2005-1

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 13-30
• Serial:
  • Transportation Research Part D: Transport and Environment
  • Volume: 10
  • Issue Number: 1
  • Publisher: Elsevier
  • ISSN: 1361-9209
  • Serial URL: http://www.sciencedirect.com/science/journal/13619209

Subject/Index Terms

• TRT Terms: Acceleration (Mechanics); Air pollution; Carbon dioxide; Carbon monoxide; Exhaust gases; Field studies; Fuel consumption; Hydrocarbons; Mobile sources; Nitrogen oxides; Pollutants; Speed; Steady state; Validation
• Uncontrolled Terms: Comparative analysis; Cruise speed; Hot stabilized emissions
• Subject Areas: Energy; Highways;

Filing Info

• Accession Number: 00985286
• Record Type: Publication
• Files: TRIS, ATRI
• Created Date: Jan 31 2005 12:00AM