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US Transient Cycle Versus ECE R.49 13-Mode Cycle
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English
Abstract
The potential of what is applicable today to measure the exhaust emissions of Heavy-Duty Diesel engines has been examined through extensive testing of the US Transient cycle and the ECE R.49 European 13-mode cycle. A careful analysis of the US Transient cycle demonstrates that only 15% of it represents true transient operation, for the majority of transients are relatively modest and thus their influence on gaseous as well as on particulate emissions is of little significance. Furthermore the US Transient cycle does not reflect the most common traffic situations. On the contrary, the 13-modes ECE R49 is representative of the driving conditions on European roads, particularly by correctly weighting of the peak torque speed. Compared to the Transient cycle, the ECE R.49 procedure is simpler and does not require expensive facilities. Tests carried out on 35 different engine configurations show that a correlation exists between particulates measured over the US Transient cycle and the ECE R.49.
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Authors
- Giorgio M. Cornetti - Committee of Common Market Automobile Constructors Bruxelles, Belgium
- Klaus Klein - Committee of Common Market Automobile Constructors Bruxelles, Belgium
- Gerhard J. Frankle - Committee of Common Market Automobile Constructors Bruxelles, Belgium
- Hans J. Stein - Committee of Common Market Automobile Constructors Bruxelles, Belgium
Topic
Citation
Cornetti, G., Klein, K., Frankle, G., and Stein, H., "US Transient Cycle Versus ECE R.49 13-Mode Cycle," SAE Technical Paper 880715, 1988, https://doi.org/10.4271/880715.Also In
References
- US Transient Cycle - Code of Federal Regulations 40
- ECE R.49 European 13-Mode Cycle - 9037/86 Weighting Factors (transposed into an EEC Directive which was adopted in principle by 11 EEC Member States at the Council of the Environment meeting March 20 1987
- Fränkle G.J. Stein H.J. “Transient or Steady-state Exhaust Emission Test Methods for Heavy-Duty Diesel Engines?” Eighth International Conference on Engines Vienna May 7-8 1987
- Cartellieri W.P. Wachter W.F. “Status Report on a Preliminary Survey of Strategies to meet US-1991 HD Diesel Emission Standards without Exhaust Gas Aftertreatment” SAE 870342 presented at the SAE International Congress Detroit February 1987
- Treiber P. Huehn U. “Particulate Emisssions from Heavy-Duty Diesel Engines under Transient Operating Conditions” First Colloquium Automobile and Engine Technology Aachen October 27-29 1987
- Barsic N.G. “Variability of Heavy-Duty Diesel Engines /Emissions for Transient and 13-Hodes /Steady-State Test Method” SAE 840346 presented at the SAE International Congress Detroit February 1984