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A supervisory Model Predictive Control (MPC) approach is developed for an air path system for multi-mode operation in a diesel engine. MPC is a control method based on a predictive dynamic model of system and determines actuator control positions through the optimization of various factors such as tracking performances of target setpoints, moving speed of actuators, limits, etc. Previously, linear MPC has been successfully applied on the air path control problem of a diesel engine, however, most of these applications were developed for a single operation mode which has only one set of control target setpoint values. In reality, a single operation mode cannot cover all requirements of current diesel engines and this complicates practical implementations of linear MPC. The high priority targets for the development of diesel engines are low emissions, high thermal efficiency and robustness.

Diesel engine has been attractive for its high thermal efficiency with the large penetration into the passenger car. Main progress of diesel engine is in the emission control and performance potential. New technologies are introduced to cope with the requirement toward cleaner engine. Although new technologies are effective in emission reduction, their application should be approached carefully because they have both positive and negative effect on fuel economy and cost. Therefore, it is important to understand the characteristics of the individual technology and optimize efficiently. It is more required in the small displacement engine. In this paper, several technologies are presented and their characteristic behaviors are investigated for a small displacement volume passenger diesel engine. Thereby, emission potential is improved to comply with upcoming emission standards.