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We propose a delay-dependent sampled-data output-feedback LPV controltechnique to address the air-fuel ratio (AFR) regulation problem in sparkignition (SI) engines. AFR control and advanced fueling strategies areessential for maximizing fuel economy while minimizing harmful exhaustemissions. The fuel path of the SI engine, as well as the three-way catalyst(TWC) simplified dynamics, have been captured by a continuous-time linearparameter-varying (LPV) system with varying time delay, where the systemdynamics rely on the engine speed, defined as the system's schedulingparameter. The interconnection of the continuous-time plant and a digitalcontroller through analog-to-digital and digital-to-analog converter devicesforms a hybrid closed-loop configuration. Therefore, in order to benefit fromcontinuous-time control synthesis tools, the input-delay method has beenemployed to transform the hybrid closed-loop system into the continuous-timedomain with system inherent time delay and an additional delay imposed by themapping approach. The designed sampled-data gain scheduled output-feedbackcontroller seeks to establish the closed-loop asymptotic stability and aprescribed level of performance for the LPV system with an arbitrarily varyingtime delay and varying sampling time, where the synthesis results are providedin a convex linear matrix inequality (LMI) constraint setting. Finally, severalclosed-loop simulation scenarios are conducted, and comparisons are provided todemonstrate the proposed methodology's performance in achieving precisereference AFR tracking and disturbance attenuation.

LPV Delay-Dependent Sampled-Data Output-Feedback Control of Fueling in Spark Ignition Engines