Transient control of air intake system in diesel engines

For the purpose of contributing to global environment protection, several research studies have been conducted involving clean-burning diesel engines. In recent diesel engines with Exhaust Gas Recirculation (EGR) systems and a Variable Nozzle Turbocharger (VNT), mutual interference between EGR and VNT has been noted. Hence, designing and adjusting control of the conventional PID controller is particularly difficult at the transient state in which the engine speed and fuel injection rate change. We propose a model-based control system with the MIMO/SISO switchable Controller, the Dynamic Feed-forward and Disturbance Observer using an engine transient model. Using this method, we achieved precise reference tracking and reduced emissions.