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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 20050143873A1
  • Filed: 05/06/2004
  • Published: 06/30/2005
  • Est. Priority Date: 05/06/2003
  • Status: Active Grant
First Claim
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1. A method for detecting and isolating fault modes in a system having a model describing its behavior and one or more measurements that are sampled regularly, the method comprising:

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

    b) algorithms to calculate and store the deviations between the actual measurements and said calculated measurements;

    c) memory of when said faults, if present, would have an effect on the said actual measurements;

    d) detection algorithms using said calculated deviations and said memory to declare when one of said fault modes becomes true;

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

    f) isolation algorithms using said calculated deviations and said memory to declare which one of the remaining said potential fault modes is the fault present.

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