Virtual sensors design to active fault tolerant control system applied to a winding machine
Résumé
The paper presents the results of a complete study on virtual sensors design to active fault tolerant control system applied to a winding machine. The process is modelled by a Linear Time Varying (LTV) model. The control of web tension is based on estimated or virtual measurements as feedback variables. The main contribution concerns the design of an accurate bank of observers able both to isolate and estimate sensor faults while preserving the system's integrity in terms of structure and performance. The objective of Active Fault Tolerant Control System, is to maintain current performances close to desirable ones and preserve stability conditions in the presence of faults. The paper addresses a general method that could allow to isolate, to estimate and to preserve sensors faults. The effectiveness and performances of the strategy are illustrated on a winding machine in the case of a complete loss of sensor.