Fault detection systems and methods for self-optimizing heating, ventilation, and air conditioning controls
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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Abstract
A fault detection system for detecting a fault in a process system includes a first circuit configured to modify an input of the process system with a modifying signal. The fault detection system further includes a second circuit configured to receive an output from the process system and configured to determine whether the fault exists based on at least one of a reduction of a signal component and an unexpected transformation of the signal component, wherein the signal component corresponds to a function of the modifying signal.
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Citations
19 Claims
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1. A fault detection system for detecting a fault in a process system, comprising:
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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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2. A controller for detecting a fault in a process system, the controller comprising:
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a circuit configured to affect an input of the process system according to an extremum seeking control strategy, wherein the circuit is configured to modify the input with a periodic modifying signal having a dither signal at a first frequency as a part of the extremum seeking control strategy, wherein the circuit controls at least one manipulated variable of the process system by using the periodic modifying signal to identify a performance gradient in the process system, wherein the extremum seeking control strategy operates to drive the performance gradient to zero; wherein the circuit is further configured to monitor an output of the process system for a signal component corresponding to a function of the first frequency of the dither signal periodic modifying signal, and wherein the circuit is further configured to determine whether the fault exists based on at least one of a reduction of the signal component and an unexpected transformation of the signal component; wherein the circuit is further 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 device. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A computerized method for detecting a fault in a process system, the method comprising:
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modifying an input of the process system with a modifying signal to determine whether the fault exists in the process system; optimizing the process system utilizing the output according to an extremum seeking control strategy, wherein the modifying signal comprises a dither signal provided to the input as a part of the extremum seeking control strategy; monitoring an output of the process system for a signal component corresponding to a function of the modifying signal; determining whether a fault exists by comparing the signal component from the output of the process system to the function of the modifying signal based on at least one of a reduction of the signal component and an unexpected transformation of the signal component; and providing an output representing the fault determination to at least one of an electronic display and communications electronics. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification