Development of a modal emissions model using data from the Cooperative Industry/Government Exhaust Emission test program

Details

• Creators:
  Wayson, Roger L. ; Kim, Brian
• Corporate Creators:
  University of Central Florida. Dept. of Civil and Environmental Engineering
• Subject/TRT Terms:
  Acceleration (Mechanics) Air Quality Emissions Testing Exhaust Gases Ground Vehicles Polluting Gases Simulation
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  University of South Florida. Dept. of Civil and Environmental Engineering
• NTL Classification:
  AGR-IMPACTS-Environment ; NTL-ENERGY AND ENVIRONMENT-Air Quality ; NTL-ENERGY AND ENVIRONMENT-Environment Impacts ; NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION
• Abstract:
  The Environmental Protection Agency’s (EPA’s) recommended model, MOBILE5a, has been
  
  used extensively to predict emission factors based on average speeds for each fleet type.
  
  Because average speeds are not appropriate in modeling intersections or other scenarios
  
  involving intermittent travel, emission factors that are specific for vehicle operating modes
  
  (acceleration, deceleration, free-flow, and idle) have been studied in the past. Several models
  
  have been developed that use the concept of acceleration-speed products to serve as input
  
  variables to determine multipliers that can be used to modify constant speed emission factors.
  
  Although relatively simplistic, this process provides results that are considered more accurate
  
  than constant speed emission factors. The Comprehensive Modal Emissions Model (CMEM)
  
  developed under sponsorship by the National Cooperative Highway Research Program
  
  (NCHRP) is based on a parameterized physical approach. While anticipated to be more
  
  accurate, the input requirements to the model are necessarily more complicated.
  
  This paper presents a new modal emissions model based on existing emissions data from the
  
  early 1990s revision efforts of the Federal Test Procedure (FTP). The model updates the older
  
  acceleration-speed product models that were based on data from the 1970s. Using secondby-
  
  second emissions data, several different forms of the modeling equations were developed
  
  and statistically analyzed for predicting multiplying factors for CO. A goal in developing this
  
  model is to serve as a comparison basis for the NCHRP model. The second and more
  
  important goal is to use the model as part of a microscale traffic simulation model that predicts air quality near roadways.
  
  
• Format:
  PDF
• Collection(s):
  Volpe Center
• Main Document Checksum:
  urn:sha256:35f877fe97d753a7038fd3264df31faf8126219abb0fee218352b5f50742dbb2
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/9819/dot_9819_DS1.pdf
• File Type:
  [PDF - 49.22 KB ]