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Because fuel efficiency is significantly impacted by the timing of combustionin internal combustion engines, accurate control of combustion phasing iscritical. In this paper, a nonlinear combustion phasing model is introduced andcalibrated, and both a feedforward model-based control strategy and an adaptivemodel-based control strategy are investigated for combustion phasing control.The combustion phasing model combines a knock integral model, burn durationmodel and a Wiebe function to predict the combustion phasing of a dieselengine. This model is simplified to be more suitable for combustion phasingcontrol and is calibrated and validated using simulations and experimental datathat include conditions with high exhaust gas recirculation fractions and highboost levels. Based on this model, an adaptive nonlinear model-based controlleris designed for closed-loop control, and a feedforward model-based controlleris designed for open-loop control. These two control approaches were tested insimulations. The simulation results show that during transient changes the CA50(the crank angle at which 50% of the mass of fuel has burned) can reach steadystate in no more than 5 cycles and the steady state errors are less than +/-0.1crank angle degree (CAD) for adaptive control, and less than +/-0.5 CAD forfeedforward model-based control.

Combustion Phasing Modelling and Control for Compression Ignition Engines with High Dilution and Boost Levels