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Fault detection systems and methods for self-optimizing heating, ventilation, and air conditioning controls

  • US 8,478,433 B2
  • Filed: 09/06/2011
  • Issued: 07/02/2013
  • Est. Priority Date: 07/17/2007
  • Status: Active Grant
First Claim
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1. A fault detection system for detecting a fault in a process system, comprising:

  • a first circuit configured to modify an input of the process system with a periodic modifying signal, wherein the first circuit is part of an extremum seeking controller and wherein the periodic modifying signal applied to the input of the process system comprises a dither signal applied to the input for probing for a performance gradient used by the extremum seeking controller to optimize the process system; and

    a second circuit configured to receive an output from the process system and to compare a signal component from the output of the process system to a function of the dither signal and to determine whether a fault exists based on at least one of a detected reduction of the signal component and an unexpected transformation of the signal component;

    wherein the second circuit is configured to provide an output signal indicative of the presence of the fault to at least one of a computerized system, a memory device, a communications device, and an electronic display.

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