Nonlinear model predictive air path control for turbocharged SI engines with low pressure EGR and a continuous surge valve

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This paper proposes a model predictive strategy for air path control turbocharged Spark Ignition (SI) engines with low pressure Exhaust Gas Recirculation (EGR). The proposed Nonlinear Model Predictive Controller (NMPC) is designed to track manifold pressure and EGR concentration reference, by manipulating throttle, EGR valve, continuous surge valve and waste gate. The NMPC is solved in real time using Sequential Quadratic Programming (SQP) to obtain the desired control actions. Simulation results demonstrate that the proposed model predictive air path control can coordinate all the actuators to track manifold absolute pressure (MAP) and EGR concentration demand with minimal response time.