Abstract
In this contribution, we present an abstract second-order mean value engine model suitable for model-based control and parameter estimation methods. Furthermore, we introduce an online capable algorithm for flex-fuel identification, i.e., ethanol content estimation, based on air-to-fuel (AFR) control. Simulation results show, that the algorithm can reliably estimate the ethanol content, and provides additional monitoring functionality about deviations in the amount of injected fuel.
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