Feedforward Controller Design for EGR and VGT Systems based on Cylinder Pressure Information and Air Path Model

Abstract

This study proposes a feedforward control method for exhaust gas recirculation (EGR) and variable geometry turbocharger (VGT) systems based on cylinder pressure information and air path model. The proposed method calculates EGR rate and exhaust manifold pressure using cylinder pressure information which provides accurate combustion state information. The accuracy of the air system model was improved according to the precise information of the EGR rate and exhaust pressure; subsequently, the performance of the proposed model based feedforward controller was enhanced. The proposed feedforward controller was implemented in an in-house developed engine management system and validated through the engine experiments under steady and transient conditions.