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Using Neural Networks to Compensate Altitude Effects on the Air Flow Rate in Variable Valve Timing Engines
Technical Paper
2005-01-0066
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
An accurate air flow rate model is critical for high-quality air-fuel ratio control in Spark-Ignition engines using a Three-Way-Catalyst. Emerging Variable Valve Timing technology complicates cylinder air charge estimation by increasing the number of independent variables. In our previous study (SAE 2004-01-3054), an Artificial Neural Network (ANN) has been used successfully to represent the air flow rate as a function of four independent variables: intake camshaft position, exhaust camshaft position, engine speed and intake manifold pressure. However, in more general terms the air flow rate also depends on ambient temperature and pressure, the latter being largely a function of altitude. With arbitrary cam phasing combinations, the ambient pressure effects in particular can be very complex. In this study, we propose using a separate neural network to compensate the effects of altitude on the air flow rate. A predictive, high-fidelity simulation tool is used to generate training samples for the altitude compensation ANN. Compared with a test-based approach both developmental cost and time are reduced. The effectiveness of the proposed approach is evaluated and validated by both engine dynamometer tests and in-vehicle tests.
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Wu, B., Filipi, Z., Kramer, D., Ohl, G. et al., "Using Neural Networks to Compensate Altitude Effects on the Air Flow Rate in Variable Valve Timing Engines," SAE Technical Paper 2005-01-0066, 2005, https://doi.org/10.4271/2005-01-0066.Also In
References
- Gray, C. “A review of variable engine valve timing.” SAE Technical Paper No. 880386 1988
- Ma, T.H. “Effect of variable engine valve timing on fuel economy.” SAE Technical Paper No. 880390 1988
- Ahmad, T. Theobald, M.A. “A survey of variable-valve-actuation technology.” SAE Technical Paper No. 891674 1989
- Dresner, T. Barkan P “A review of variable valve timing benefits and modes of operation.” SAE Technical Paper No. 891676 1989
- Asmus, T.W. “Perspectives on applications of variable valve timing.” SAE Technical Paper No. 910445 1991
- Leone, T.G. Christenson, E.J. Stein R.A. “Comparison of variable camshaft timing strategies at part load.” SAE Technical Paper No. 960584 1996
- Bozza, F. Gimelli, A. Senatore, A. Caraceni, A. “A theoretical comparison of various VVA systems for performance and emission improvement of SI-engines.” SAE Technical Paper No. 2001-01-0670 2001
- Fu, H. Chen, X. Mustafa, E. Trigui, N. “Analytical investigation of cam strategies for SI engine part load operation.” SAE Technical Paper No. 2004-01-0997 2004
- Shelef, M. McCabe, R.W. “Twenty-five years after introduction of automotive catalysts: what next.” Catalysis Today 62 1 2000 35 50
- Aquino, C.F. “Transient A/F control characteristics of the 5 liter central fuel injection engine.” SAE Technical Paper No. 810494 1981
- Wu, B. Filipi, Z. Assanis, D. Kramer, D.M. Ohl, G.L. Prucka, M.J. DiValentin, E. “Using artificial neural networks for representing the air flow rate through a 2.4 liter VVT engine.” SAE Technical Paper No. 2004-01-3054 2004
- WAVE V5 Engine Reference Manual Ricardo Software, Ricardo, Inc. November 2002
- WAVE V5 Basic Reference Manual Ricardo Software, Ricardo, Inc. November 2002
- Filipi, Z. Assanis, D.N. “Quasi-dimensional computer simulation of the turbocharged spark-ignition engine and its use for 2- and 4-valve engine matching studies.” SAE Technical Paper No. 910075 1991
- Tabaczynski, R.J. Ferguson, C.R. Radhakrishnan, K. “A turbulent entrainment model for spark-ignition engine combustion.” SAE Technical Paper No. 770647 1977
- Tabaczynski, R.J. Trinker, F.H. Shannon, B.A. “Further refinement and validation of a turbulent flame propagation model for spark-ignition engines.” Combustion and Flame 39 2 1980 111 121
- Poulos, S.G. Heywood, J.B. “The effect of chamber geometry on spark-ignition engine combustion.” SAE Technical Paper No. 830334 1983
- Tennekes, M. Lumley, J.L. A First Course in Turbulence MIT Press Cambridge, Massachusetts 1972
- Blizard, N.C. Keck, J.C. “Experimental and theoretical investigation of turbulent burning model for internal combustion engine.” SAE Technical Paper No. 740191 1974
- Agarwal, A. Filipi, Z. S. Assanis, D. N. Baker, D.M. “Assessment of Single- and Two-Zone Turbulence Formulations for Quasi-Dimensional Modeling of Spark-Ignition Engine Combustion.” Combustion Science and Technology 136 1-6 1998 13 39
- Filipi, Z. “Investigation of Variable Valve Area Strategies for a Turbocharged SI-Engine.” Proceedings of the IMechE 1994-6, 5th International Conference on Turbocharging and Turbochargers London 1994 93 102
- Filipi, Z.S. Assanis, D.N. “The Effect of Stroke-to-Bore Ratio on Combustion, Heat Transfer and Performance of a Homogeneous-Charge Spark-Ignited Engine of Given Displacement.” International Journal of Engine Research 1 2 London 2000 191 208
- Papalambros, P.Y. Wilde, D.J. Principles of Optimal Design: Modeling and Computation 2nd Cambridge University Press New York 2000 291 292
- McKay, M.D. Beckman, R.J. Conover, W.J. “A comparison of three methods for selecting values of input variables in the analysis of output from a computer code.” Technometrics 21 2 May 1979 239 245
- Lunani, M. Sudjianto, A. Johnson, P.L. “Generating efficient training samples for neural networks using Latin Hypercube sampling.” Proceedings of the 1995 Artificial Neural Networks in Engineering (ANNIE'95) St. Louis, MO, USA Nov. 12-15 1995 209 214