Sliding mode method for predictive diagnostics
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United States of America Patent
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Feb 2, 2010
Grant Date -
Mar 6, 2008
app pub date -
Nov 17, 2005
filing date -
Nov 18, 2004
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Abstract
A diagnostics subsystem for performing predictive diagnostics on a machine such as a vacuum pump. The subsystem has one or more parameter sensors providing measurable data, a process model for modelling machine operation and generating at least one estimated operating parameter, a comparator for comparing the sensed operating parameter with the estimated operating parameter; discontinuous signal injection means for injecting a discontinuity into the model to maintain sliding mode operation in the model; and means for analyzing the discontinuous injection signal for trends indicative of a fault in the machine.
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