SPEED DEPENDENT REPRESENTATIVE EMISSION FACTORS OF CATALYST PASSENGER CARS AND INFLUENCING PARAMETERS

Speed dependent hot emission factors of three-way catalyst equipped passenger cars are presented. The emission factors were developed using emission data of in-use vehicles from chassis dynamometer testing over real-world driving cycles. The variability of the experimental data and the implementation of cycles of different characteristics result in a low correlation of emission factors with mean travelling speed. An analysis conducted identifies divert vehicle emission performance as the main variability inducing parameter. The potential of decreasing emission variability by classifying vehicles according to their engine capacity and mileage is studied by means of an Analysis of Variance test. Results show that CO, NOx and HC emissions depend on mileage but not on engine size, while CO2 is found to strongly depend on engine size, being insensitive to vehicle mileage. (A) For the covering abstract see IRRD E101903.

• Corporate Authors:

  Technical University Graz

  Institute for Internal Combustion Engines and Thermodynamics, Inffeldgrasse 25
  A-8010 Graz,   Austria 
• Authors:
  • PISCHINGER, R
  • Ntziachristos, L
  • Samaras, Z
• Conference:
  • PROCEEDINGS OF THE EIGHTH INTERNATIONAL SYMPOSIUM TRANSPORT AND AIR POLLUTION INCLUDING COST 319 FINAL CONFERENCE, GRAZ, AUSTRIA, 31 MAY - 2 JUNE 1999
• Publication Date: 1999

Language

• English

Media Info

• Features: References;
• Pagination: p. 159-68
• Serial:
  • Volume: 76

Subject/Index Terms

• TRT Terms: Catalysis; Engine displacement; Engine operation; Exhaust pipes; Pollutants; Speed
• ITRD Terms: 7127: Catalysis; 2442: Emission; 3870: Engine capacity; 1384: Exhaust pipe; 5408: Speed
• Subject Areas: Environment; Vehicles and Equipment;

Filing Info

• Accession Number: 00768744
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Sep 10 1999 12:00AM