Towards Robust H-infinity Control of an SI Engine's Air/Fuel Ratio

Paper #:
  • 1999-01-0854

Published:
  • 1999-03-01
Citation:
Vigild, C., Andersen, K., Hendricks, E., and Struwe, M., "Towards Robust H-infinity Control of an SI Engine's Air/Fuel Ratio," SAE Technical Paper 1999-01-0854, 1999, https://doi.org/10.4271/1999-01-0854.
Pages:
16
Abstract:
Long term stoichiometric Air/Fuel Ratio (AFR) control of an SI engine is at the present mainly maintained by table mapping of the engine's fresh air intake as a function of the engine operating point. In order to reduce a stationary error in the AFR to zero the table based control normally works in conjunction with a PI feedback from a HEGO sensor. The effective bandwidth of this feedback loop is quite small and seldom exceeds 2 Hz. This is altogether too small for accurate transient AFR control.This paper presents a new λ (normalized Air/Fuel Ratio) control methodology (H∞ control) which has a somewhat larger bandwidth and can guarantee robustness with respect to selected engine variable and parameter variations.
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