Diagnosis of Physical Systems with Hybrid Models using Parametrized Causality
Mosterman, P.J. (2001) Diagnosis of Physical Systems with Hybrid Models using Parametrized Causality. In: Hybrid Systems: Computational and Control, 4th International Workshop, HSCC 2001, Rome, Italy, March 28-30, 2001 Lecture Notes in Computer Science, 2034. Springer. ISBN 3-540-41866-0.
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Efficient algorithms exist for fault detection and isolation of physical systems based on functional redundancy. In a qualitative approach, this redundancy can be captured by a temporal causal graph (TCG), a directed graph that may include temporal information. However, in a detailed continuous model, time constants may be present that are beyond the bandwidth of the data acquisition system, which leads to incorrect fault isolation because of a difference in observed and modeled behavior. To solve this, the modeled time constants can be taken to be infinitely small, which results in a model with mixed continuous/discrete, hybrid behavior that is difficult to analyze because the causality of the directed graph may change. In this paper, to avoid the combinatorial explosion when using a bank of TCGs in parallel, causal paths are parametrized by the state of local switches. The result is a hybrid model that produces parametrized predictions that can be efficiently matched against observed behavior.
|Document Type:||Contribution to a Collection|
|Title:||Diagnosis of Physical Systems with Hybrid Models using Parametrized Causality|
|Journal or Publication Title:||Hybrid Systems: Computational and Control, 4th International Workshop, HSCC 2001, Rome, Italy, March 28-30, 2001|
|In ISI Web of Science:||No|
|Series Name:||Lecture Notes in Computer Science|
|Keywords:||hybrid system, hybrid diagnosis, model based diagnosis, quantitative reasoning|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W SY - Technik für Raumfahrtsysteme|
|DLR - Research area:||Space|
|DLR - Program:||W SY - Technik für Raumfahrtsysteme|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Institute of Robotics and Mechatronics|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||16 Sep 2005|
|Last Modified:||14 Jan 2010 17:49|
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