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Experiences with a Mini-Dilution System for Engine Homologation and Development
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Sector:
Event:
SAE Brasil '94
Language:
English
Abstract
The full-flow CVS dilution system is defined by the US EPA for particulate measurement of Heavy-Duty (HD) Diesel engines. Such systems are bulky and expensive. The EEC (1), Brazil and many other countries have therefore accepted the use of so-called “Partial-Flow Dilution Systems” (PDS) for homologation of HD engines. The ISO TC70 (2) committee even recommends such systems for the emissions measurement of Off-Road Diesel engines. Such systems sample and dilute only a fraction of the total exhaust, therefore they are much smaller than a full-flow CVS.
However, it is required that the most important properties and conditions of a full-flow CVS systems are also fulfilled by a PDS. Therefore an accurate sampling and dilution control must be implemented in all Partial-Flow Dilution Systems (which makes such systems more complicated than a full-flow CVS). Various types of control have been developed and are described in the EEC and ISO regulations. Their advantages and drawbacks will be discussed in the paper. Special emphasis will be given to their applicability for the steady-state tests defined by the EEC, Brazil and ISO for engine homologation. Comparison of this system with full-flow CVS data are also presented.
Moreover, the possibilities to use such an equipment for transient (US HD-cycle) testing during development phases and for quasi-transient testing are discussed. Future application for gaseous emission measurement in future LEV and ULEV testing will be investigated.
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Citation
Engeljehringer, K. and Schindler, W., "Experiences with a Mini-Dilution System for Engine Homologation and Development," SAE Technical Paper 942418, 1994, https://doi.org/10.4271/942418.Also In
References
- ECE Directive 91/542/EEC Official Journal of the European Communities, No. L295/1 Oct. 1991
- ISO Draft 8178 “RIC Engines - Exhaust Emission Measurement” Nov. 11 1992
- Code of Federal Regulations 40 1993
- Abbass, M.H. Andrews, G.E. Bartle, K.D. Williams, D.T. “Diesel Particulate Composition Changes along an Air Cooled Exhaust Pipe and Dilution Tunnel” SAE Technical Paper Series 890789 1989
- Stein, H.J. Ekermo, A.E. Treiber, P.J.H. “Emission Correlation of Heavy Duty Transient Test Facilities” SAE Technical Paper Series 892492 1989
- Kittelson, D.B. Johnson, J.H. Result of American Round Robin Test
- Ryu, h. Yamazaki, H. Research and Development of a Partial Flow Dilution Tunnel Having a Venturi Type Splitter Journal of JARI 16 2 29 1994
- Mooser, D. Bollman-Weiss, R. Carli, S. 1993
- Kittelson, D.B Johnson, J.H. “Variability in Particulate Emission Measurement in Heavy-Duty Transient Tests” SAE Technical PaperSeries 910738 1991
- Engeljehringer, K. Schindler, W. “Meeting ISO 8178 Requirements for the Measurement of Diesel Particulates with Partial-Flow Dilution Systems SAE Technical Paper Series 932466 1993