Delay Correction Model for Estimating Bus Emissions at Intersections Based on VSP Distributions

The intersection is one of the biggest emission points for buses. Although numerous performance indexes have been developed for evaluating the level of service at intersections, few studies have focused on the relationship between commonly used performance indexes and emissions at intersections. This paper intends to propose a model that relates emissions to commonly used performance indexes (i.e. delay, stops) by using bus activity data and emissions data at intersections. First, with a large number of real-world instantaneous emission data and corresponding activity data collected by the Portable Emission Measurement System (PEMS), emission rates are derived for different Vehicle Specific Power (VSP) bins. Then, 2,002 sets of trajectory data, an equivalent of about 140,000 sets of activity data, are obtained from Global Position Systems (GPS)-equipped diesel buses in Beijing. The delay and the emission factor of each trajectory data are estimated. Then, by using baseline emission factors for two types of intersections, e.g. the Arterial @ Arterial Intersection and the Arterial @ Collector, delay correction factors are calculated for the two types of intersections in different delays. Finally, delay correction models are established for each type of intersections and different numbers of stops. A comparative analysis between estimated and actual emissions factors demonstrate that the delay correction model is reliable.

• Supplemental Notes:
  • This paper was sponsored by TRB committee ADC20 Transportation and Air Quality. Alternate title: Delay Correction Model for Estimating Bus Emissions at Intersections Based on Vehicle-Specific Power Distributions
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Zhou, Xixi
  • Song, Guohua
  • Yu, Lei
• Conference:
  • Transportation Research Board 93rd Annual Meeting
  • Location: Washington DC
  • Date: 2014-1-12 to 2014-1-16
• Date: 2014

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 20p
• Monograph Title: TRB 93rd Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Buses; Diesel engine exhaust gases; Global Positioning System; Intersections; Mathematical models; Stopped time delays; Stopping
• Identifier Terms: Portable Emissions Measurement System
• Uncontrolled Terms: Vehicle specific power
• Geographic Terms: Beijing (China)
• Subject Areas: Environment; Highways; Planning and Forecasting; Vehicles and Equipment; I15: Environment; I72: Traffic and Transport Planning; I90: Vehicles;

Filing Info

• Accession Number: 01515251
• Record Type: Publication
• Report/Paper Numbers: 14-1956
• Files: TRIS, TRB, ATRI
• Created Date: Feb 21 2014 3:18PM