| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 721834 | IFAC Proceedings Volumes | 2006 | 6 Pages |
A model-based, real-time capable fault detection and diagnosis system employing a Least-Squares parameter estimation approach is developed in this paper. A physical-based model of the proportional valve and the differential cylinder is derived. The performance of the current linearized flow model is evaluated and severe deficiencies are observed. Therefore, a nonlinear flow model is introduced, which governs the behavior of the hydraulic flow as a function of the valve spool displacement. Also, temperature effects are investigated and subsequently introduced into temperature dependent thresholds. Experimental results at a testbed with both intact and defective components show the good performance of the presented fault-detection and diagnosis method.
