Emissions from Plug-in Hybrid Electric Vehicle (PHEV) During Real World Driving Under Various Weather Conditions

Plug-in hybrid electric vehicles (PHEVs) are regarded as a key technology in reducing the impact of internal combustion engines on air pollution and greenhouse gases. PHEVs have the advantage in market penetration due to its lower cost and higher driving range, as compared to electric vehicles (EVs). On the other hand, PHEVs still emit air pollutants due to the presence of an internal combustion engine. Current regulations require emissions to be tested on a chassis dynamometer. However, it is known that on-road emissions can be quite different from that measured in regulatory driving cycles in the lab. In this study, emissions from two HEVs with different combustion technologies (gasoline direction injection vs. port fuel injection) were compared using PEMS (portable emissions measurement system) and tailpipe sensors under cold weather conditions. The study found that the frequency and duration of re-ignition events vary depending on the type of HEV. Prius showed more frequent re-ignition events compared to Sonata for both city and highway driving conditions. Prius re-ignited almost every one minute while Sonata re-ignited every two minutes on average during the city driving condition. Re-ignition events affected emissions profiles significantly during the city driving condition. As a result, the Prius showed higher NOx emissions during the city driving condition while the Sonata showed higher NOx emissions during the cold-cold start and highway driving condition. Future studies should include more vehicles to understand whether the re-ignition events are vehicle specific or technology specific.

Language

  • English

Project

  • Status: Completed
  • Funding: $80210
  • Contract Numbers:

    DTRT13-G-UTC29

  • Sponsor Organizations:

    National Center for Sustainable Transportation

    University of California, Davis
    Davis, CA  United States 

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Managing Organizations:

    National Center for Sustainable Transportation

    University of California, Davis
    Davis, CA  United States 
  • Project Managers:

    Iacobucci, Lauren

  • Performing Organizations:

    University of California, Riverside

    Center for Environmental Research and Technology
    900 University Avenue
    Riverside, CA  United States  92521-0425
  • Principal Investigators:

    Jung, Heejung

  • Start Date: 20161001
  • Expected Completion Date: 20170731
  • Actual Completion Date: 20180228
  • USDOT Program: University Transportation Centers

Subject/Index Terms

Filing Info

  • Accession Number: 01616119
  • Record Type: Research project
  • Source Agency: National Center for Sustainable Transportation
  • Contract Numbers: DTRT13-G-UTC29
  • Files: UTC, RiP
  • Created Date: Nov 3 2016 12:16PM