離散化モデルを用いたHCCIエンジンの制御シミュレーション

抄録

Homogeneous charge compression ignition (HCCI) engine has some advantages such as high efficiency and low emissions. On the other hand, it has challenges that it is difficult to avoid knocking and misfire. Therefore, the precise control system of HCCI combustion is necessary. In this paper, firstly, a control-oriented model which was discretized to several representative points in 1 cycle of an HCCI engine was developed. Secondly, a control system based on the modern control theory was constructed. It consists of a feed-forward controller and a feedback controller with Kalman filter to estimate state variables. The controller based on only a sole linear model has a disadvantage that its performance deteriorates except when the controller works at equilibrium points. Therefore, a gain-scheduling controller was introduced to the nonlinear system. The control simulation was conducted for the nonlinear plant model with the developed gain-scheduling controllers, and both IMEP and the in-cylinder pressure rising rate were controlled over a wide range IMEP.