VARIABILITY OF HEAVY DUTY VEHICLE OPERATING MODE FREQUENCIES FOR PREDICTION OF MOBILE EMISSIONS

The paper discusses a new geographic information system (GIS)-based modal emissions model being developed with EPA and Georgia Tech to account for vehicle load conditions that will significantly improve the spatial result of emissions estimates. The GIS-based modal research model employs detailed subfleet engine and emissions characteristics and the speed/acceleration profiles for vehicle activity along links in the transportation system. Composition of the vehicle subfleet affects the amount of emissions produced under various operating conditions, dependent upon the load induced by the vehicle and driver, and the physical constraints of the vehicle. The aggregate modal frequencies are compared across vehicle classes to show differences in how heavy duty vehicles are operated.

Language

  • English

Media Info

  • Pagination: 18p

Subject/Index Terms

Filing Info

  • Accession Number: 00766498
  • Record Type: Publication
  • Files: NTL, TRIS
  • Created Date: Jul 5 1999 12:00AM