F071002 Engine Control Model and Design of Dynamics Controller

Abstract

Concepts of model based development and model based control become more important from the several points of view, such as for installing advanced combustion technologies, improving engine performance for transient operation, and reducing development procedures and cost. In this paper, the simplified engine control model for HCCI engine is presented. The model has been developed to apply to ECU for the purpose of the model based control. The model employs a concept of discretization to only express specific points of a cycle for a feed forward control purpose and achieves its calculation speed enough fast. The model is also available for designing a feedback controller. The developed model is validated in static conditions and compared with experiments. As a result, it shows good agreement even when the several actuators change. Transient response of HCCI engine is also simulated for step change of actuators. In addition, LQG feedback controller is designed based on the model, and combustion control is demonstrated with the controller in simulation. Such demonstrations also provide a guideline of HCCI engine control.