Online monitoring and diagnosis of batch processes: Empirical model-based framework and a case study

Hyun Woo Cho, Kwang Jae Kim, Myong K. Jeong

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


An empirical model-based framework for monitoring and diagnosing batch processes is proposed. With the input of past successful and unsuccessful batches, the off-line portion of the framework constructs empirical models. Using online process data of a new batch, the online portion of the framework makes monitoring and diagnostic decisions in a real-time basis. The proposed framework consists of three phases: monitoring, diagnostic screening, and diagnosis. For monitoring and diagnosis purposes, the multiway principal-component analysis (MPCA) model and discriminant model are adopted as reference models. As an intermediate step, the diagnostic screening phase narrows down the possible cause candidates of the fault in question. By analysing the MPCA monitoring model, the diagnostic screening phase constructs a variable influence model to screen out unlikely cause candidates. The performance of the proposed framework is tested using a real dataset from a PVC batch process. It has been shown that the proposed framework produces reliable diagnosis results. Moreover, the inclusion of the diagnostic screening phase as a pre-diagnostic step has improved the diagnosis performance of the proposed framework, especially in the early time intervals.

Original languageEnglish (US)
Pages (from-to)2361-2378
Number of pages18
JournalInternational Journal of Production Research
Issue number12
StatePublished - Jun 15 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Strategy and Management
  • Management Science and Operations Research
  • Industrial and Manufacturing Engineering


  • Batch process
  • Diagnosis
  • Discriminant analysis
  • Empirical model
  • Monitoring
  • Multiway PCA
  • Variable influence

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