The purpose of this study is to develop a model for the gas exchange process in a rebreathing homogeneous charge compression ignition (HCCI) engine. HCCI engines are attracting significant attention due to their low emissions and high efficiency. To design the control system of an HCCI engine, it is necessary to develop a control-oriented engine model. The developed model lowers its computational load by combining two types of models. The model consists of a discrete model for the exhaust process (the first half of the gas exchange process) and a continuous model with a variable calculation step size for the rebreathing process (the latter half of the gas exchange process). Also, the constructed model maintained its prediction accuracy, as the pressure pulsation in the exhaust port was modeled, and an unsteady flow equation was used. It was confirmed that the model developed for the gas exchange process calculated in about half time of one cycle and reproduced the results of 1D engine simulation software with a maximum error of about 10% in the in-cylinder pressure, temperature, and trapped mass.

本研究的目的是为再呼吸均质充量压缩点火 (HCCI) 发动机中的气体交换过程开发模型。HCCI 发动机因其低排放和高效率而备受关注。为了设计HCCI发动机的控制系统，需要开发面向控制的发动机模型。开发的模型通过结合两种类型的模型来降低其计算负载。该模型由排气过程（气体交换过程的前半部分）的离散模型和再呼吸过程（气体交换过程的后半部分）具有可变计算步长的连续模型组成。此外，构建的模型保持了其预测精度，因为排气口中的压力脉动被建模，并且使用了非定常流动方程。