Adaptive Internal Model Control for Air-Fuel Ratio regulation

Advances in control design for time delay systems are complemented by advances in respective system analysis techniques, and robustness of time delay systems under parametric uncertainties is a topic of active research. We consider uncertain systems subject to time delay, and implicitly compensate for the delay by employing the Internal Model Controller (IMC) design principles. We combine a nominal IMC scheme with an adaptive law in the presence of unknown and possibly time-varying system parameters due to changing operating conditions. The resulting adaptive control structure is used to address the Air Fuel Ratio (AFR) regulation problem which is known to be one of the main control challenges for internal combustion engines.