To achieve stringent emission regulation standard and deliver desired engine performance, modern diesel engines are equipped with an exhaust gas recirculation system and a turbocharger to regulate the fraction of exhaust gas and intake manifold pressure. Due to the actuator coupling effect and the high nonlinearity of the system behavior, it is difficult to apply classical control designs in such a case. To solve this issue, this paper presents a disturbance observer based approach for the airpath controls of turbocharged diesel engines. The disturbance observer is synthesized with the controller to compensate the unknown dynamics and system uncertainties of the engine plant that will make the controller more robust and less dependent on the accuracy of mathematical modeling. The performance of proposed observer and controller schemes are demonstrated by numerical simulation with a full order diesel engine model.

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