402e Nonlinear Diagonal Unknown Input Observers for Fault Diagnosis

Pramod Vachhani, Sridharakumar Narasimhan, and Raghunathan Rengaswamy Process fault diagnosis is the problem of identifying the causal origins of faults in a process, given current sensor data and a priori knowledge about the process behaviour under normal and abnormal conditions. Fault diagnosis is increasingly becoming important for process safety, improved product quality and process economics. Fault diagnosis strategies may be broadly classified as qualitative modelbased, quantitative model-based and data-based approaches.