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Individual Cylinder Air–Fuel Ratio Control Using Fourier Analysis

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3 Author(s)
Schick, W. ; Dept. of Mech. & Process Eng., ETH Zurich, Zurich, Switzerland ; Onder, C. ; Guzzella, L.

Based on Fourier analysis, a general concept for the cylinder imbalance control problem with a single air-fuel ratio (A/F) sensor is presented. First, a control-oriented engine model is developed that is applicable for arbitrary engine types. With the model, a controller is designed, and the corresponding multirate control system is investigated in terms of stability using eigenvalue analysis. Moreover, a robustness analysis with respect to parametric uncertainties in the phase information is conducted using Monte Carlo simulations. It turns out that a good match of the model at steady state is more important than a sophisticated controller design. The domain of stable operation is identified. A five-cylinder test-bench engine is used to validate the model, to investigate the controller performance during a driving cycle, and to validate the results from the robustness analysis.

Published in:

Control Systems Technology, IEEE Transactions on  (Volume:19 ,  Issue: 5 )