...S. Borguet; P. Dewallef; O. Léonard Least-squares health parameter identification techniques, such as the Kalman filter, have been extensively used to solve diagnosis problems. Indeed, such methods give a good estimate provided that the discrepancies between the model prediction...

.... The algorithms used in this paper for on-line and off-line diagnostics are based on model-based estimation techniques. The on-line algorithm for fault detection is based on the hybrid Kalman filter (HKF) technique. The HKF is a uniquely structured Kalman filter which lends itself to the health baseline update...

...Takahisa Kobayashi; Donald L. Simon In this paper, a diagnostic system based on a uniquely structured Kalman filter is developed for its application to in-flight fault detection of aircraft engine sensors. The Kalman filter is a hybrid of a nonlinear on-board engine model (OBEM) and piecewise...