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Methods to Reduce Air-charge Characterization Data for High Degree of Freedom Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 08, 2004 by SAE International in United States
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Current methods of storing critical engine operating parameters often rely on lookup interpolation functions. A drawback to lookup interpolations is that as the number of independent variables increases, the function's dimensions increase from tables to cubes to hypercubes of data. A sparser collection of data may serve if the strict orthogonal structure of lookup functions is not required. Instead of forming a matrix of data for every combination of input variables, a few critical data points are stored with their independent variables. The available data can be used to estimate parameters at new input values (typically from current measurements) by relating the available data by its distance from the new inputs. An inverse distance weighting scheme is used to calculate the output of the function. A dual independent variable cam timing engine offers an example where the air charge coefficients used for transient air charge and inferred manifold pressure can be more efficiently stored without a large loss in estimation accuracy.
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CitationMagner, S., Jankovic, M., and Cooper, S., "Methods to Reduce Air-charge Characterization Data for High Degree of Freedom Engines," SAE Technical Paper 2004-01-0903, 2004, https://doi.org/10.4271/2004-01-0903.
- Aquino C.F. “Transient A/F Control Characteristics of the 5 Liter Central Fuel Injection Engine,” SAE Technical Paper No. 810494
- Box G.E.P. Wilson K. B. “On the Experimental Attainment of Optimum Conditions,” Journal of the Royal Statistical Society, Series B 13 1 38 1951
- Draper C.S. Li Y.T. “Principles of optimalizing control systems and an application to the internal combustion engine,” ASME Publications 415 429 1954
- Edwards S.P. et. al. Statistics for Engine Optimization Professional Engineering Publishing Ltd. London 1999
- Jankovic M. Magner S.W. “Controlling Complex Automotive Engine Configurations for Optimal Performance, Fuel Economy, and Emissions,” Proceedings for the Global Powertrain Congress Ann Arbor Michigan September 2003
- Jankovic M. Magner S.W. “Cylinder air-charge estimation for advanced intake valve operation in variable cam timing engines,” JSAE Review 22 March 2001
- Jankovic M. Magner S.W. “Variable Cam Timing: Consequences to Automotive Engine Control Design,” Proceedings of 15-th IFAC World Congress Barcelona, Spain July 2002
- Hardle W. Applied Nonparametric Regression Cambridge University Press Cambridge 1989
- Leone T.G. Christenson E.J. Stein R.A. “Comparison of Variable Camshaft Timing Strategies at Part Load,” SAE Paper 960584 1996
- Montgomery D.C. Design and analysis of experiments 5th John Wiley & Sons New York 2001
- Popovic D. Jankovic M. Magner S. Teel A. “Extremum seeking methods for optimization of variable cam timing engine operation,” Proceedings of the American Control Conference Denver, CO June 2003
- Spall J. C. “Multivariate Stochastic Approximation Methods,” IEEE Transactions on Automatic Control 37 332 341 1992