This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Signal Reconstruction Techniques for Improved Measurement of Transient Emissions
Annotation ability available
Sector:
Language:
English
Abstract
Conventional exhaust gas analyzers are of limited use in transient engine testing as the dynamics of the analyzers cause distortion of the emissions measurement during transients. An advanced technique is presented which uses signal reconstruction to determine the actual emissions during engine transients from the distorted output of a conventional exhaust gas analyzer. The reconstruction technique is based on the design of a finite horizon filter which is a dual of generalized predictive control theory. Results are presented which demonstrate the use of this technique for reconstruction of instantaneous emissions from a diesel engine over a part of the US heavy duty test cycle. The results show that the reconstructed emissions recover significant information which is otherwise obscured by the distortion introduced by the analyzer dynamics. In addition, the reconstructed emissions can be corrected for exhaust gas mass flow rate, enabling a more accurate evaluation of the instantaneous and cumulative mass emissions during complex transient cycles to aid in engine development.
Recommended Content
Technical Paper | Application of Signal Reconstruction to On-Road Emissions Testing |
Authors
Citation
Beaumont, A., Noble, A., and Pilley, A., "Signal Reconstruction Techniques for Improved Measurement of Transient Emissions," SAE Technical Paper 900233, 1990, https://doi.org/10.4271/900233.Also In
References
- Needham, J. R. Doyle, D. M. Faulkner, S. A. Freeman, H. D. 1989 “Technology for 1994” SAE 891949
- Collings, N. Eade, D 1988 “An Improved Technique for Measuring Cyclic Variations in the Hydrocarbon Concentration in an Engine Exhaust” SAE 880316
- Butler, J. W. Haak, L. P. Colvin, A. D. McKelvy, F. E. 1984 “Fast-Response Zirconia Sensor-Based Instrument for Measurement of the Air/Fuel Ratio of Combustion Engines” SAE 840061
- Chujo, Y. Aoki, K. Kamo, T. Ogino, M. Suzuki, M. Saito, T. 1989 “Development of Onboard Fast-Response Air-Fuel Ratio Meter using Lean Mixture Sensor” SAE 89038
- McClure, B. T. 1988 “Characterization of the Transient Response of a Diesel Exhaust-Gas Measurement System” SAE 881320
- Pilley, A. D. Noble, A. D. Beaumont, A. J. Needham, J. R. Porter, B. C. 1989 “Optimisation of Heavy-Duty Diesel Engine Transient Emissions by Advanced Control of a Variable Geometry Turbocharger” SAE 890395
- Beaumont, A. J. Noble, A. D. Mercer, A. S. 1988 “Predictive Control of Transient Engine Testbeds” Proc. IEE Int. Conf. on Control 88
- Clarke, D. W. Mohtadi, C. Tuffs, P. S. 1987 “Generalised Predictive Control, Part 1: The Basic Algorithm” 1987 Automatica 23 2
- Pilley, A. D. 1987 “The Transient Response Characteristics of Emissions Analyzers” Ricardo Internal Publication DP 87/0064
- Noble, A. D. 1987 “Emissions Analyser Input Reconstruction” Ricardo DP 87/0999
- Ljung, L. 1987 “System Identification: Theory for the User” Prentice-Hall
- Norton, J. P. 1986 “An Introduction to Identification” Academic Press
- Moler, C. Little, J. Bangert, S. 1987 “Pro-Matlab Users Guide” The MathWorks Inc.
- EPA Code of Federal Regulations July 1987 Section 86.1241-84 Test Cycle Validation Criteria