The proposed state - space monitoring approach is tested on a pulp digester . 4sid method is used to develop a state - space model of multi - dimensional batch variables correlation from nomal operating data . simulation results on pulp quality control and process monitoring shows the effectiveness of the method 4 、在上述研究的基础上，以间歇蒸煮为应用背景，对过程输入输出数据进行子空间辨识，建立了状态空间模型，应用于该过程的纸浆质量控制和过程监视。
