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Model-based fault detection and isolation for intermittently active faults with application to motion-based thruster fault detection and isolation for spacecraft

  • US 7,451,021 B2
  • Filed: 05/06/2004
  • Issued: 11/11/2008
  • Est. Priority Date: 05/06/2003
  • Status: Expired due to Fees
First Claim
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1. A method for detecting and isolating intermittently observable fault modes in a system having models describing its behavior and one or more measurements that are sampled regularly, said method comprising:

  • (a) said models and computing capacity to calculate past and present measurements that would result from said system with no faults, as well as from said system with one or more potential fault mode candidates;

    (b) algorithms to calculate and store deviations between said calculated measurements and either actual measurements or an abstraction of said actual measurements as returned by a filtering function;

    (c) detection algorithms using said calculated deviations at times or states comprising present and historical data to declare when one of said fault mode candidates or anomalies in the data un-related to said fault modes becomes possible;

    (d) exoneration algorithms using said calculated deviations to remove certain fault mode candidates from consideration as a potential fault mode, thereby making the decision making in the final step simpler and more robust; and

    (e) isolation algorithms using said calculated deviations to declare which one of remaining said potential fault mode candidates is the true fault mode.

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