A control-oriented air-fuel ratio path model is developed to represent a spark-ignited, port-fuel-injected, twin-independent variable cam timing engine. Following a recent publication [Genç et al., SAE 2002-01-2752 (2002)] showing that cam timing not only affects the cylinder air flow but also the transient cylinder fuel flow, this paper constructs a mean value model that describes both air and fuel dynamics. While steady-state engine tests have been performed in order to identify the air path dynamics, a combination of linear and nonlinear identification methods have been used in order to identify the fuel path model including the wall-wetting dynamics. The resulting parameter-varying model has been validated with independent experimental data and can be used in powertrain controller design and development.
Identification of the Twin Independent Variable Cam Timing Engines for AFR Control
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Genç, A. U., and Glover, K. (April 12, 2005). "Identification of the Twin Independent Variable Cam Timing Engines for AFR Control." ASME. J. Dyn. Sys., Meas., Control. December 2005; 127(4): 589–600. https://doi.org/10.1115/1.2101849
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