Efficient fuzzy logic fault accommodation algorithm
First Claim
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1. In a control system having redundant sensors providing at least two sensed values of a single parameter being measured, and having means for generating a synthesized value of said parameter;
- a method of determining a single output value of said parameter for use in the control system, comprising the steps of;
determining a first error by comparing said sensed values to one another;
determining a second error by comparing said sensed values to said synthesized value;
determining a graded membership of said first and second errors from a fuzzy logic look-up table; and
calculating a preselected weighted average of said sensed values based on said graded membership, said preselected weighted average being the single output value of said parameter for use in the control system.
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Abstract
A simplified fault logic accomodation control which utilizes fuzzy logic to assist in calculating a preselected weighted average of the values of two redundant sensors that are sensing the same parameter. A synthesized, third, predicted value of the parameter is used in the fuzzy logic to arbitrate between the two sensed values.
32 Citations
17 Claims
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1. In a control system having redundant sensors providing at least two sensed values of a single parameter being measured, and having means for generating a synthesized value of said parameter;
- a method of determining a single output value of said parameter for use in the control system, comprising the steps of;
determining a first error by comparing said sensed values to one another; determining a second error by comparing said sensed values to said synthesized value; determining a graded membership of said first and second errors from a fuzzy logic look-up table; and calculating a preselected weighted average of said sensed values based on said graded membership, said preselected weighted average being the single output value of said parameter for use in the control system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 15, 16)
- a method of determining a single output value of said parameter for use in the control system, comprising the steps of;
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10. In a control system having redundant sensors providing at least two sensed values of a single parameter being measured, and having means for generating a synthesized value of said parameter;
- a method of determining a single output value of said parameter for use in the control system, comprising the steps of;
determining a first error based on the difference between said sensed values; selecting one of the sensed values according to a predetermined criteria; determining a second error based on the difference between said synthesized value and said selected one of the sensed values; determining a graded membership of said first and second errors from a fuzzy logic look-up table; and calculating a preselected weighted average of said sensed values based on said graded membership, said preselected weighted average being the single output value of said parameter for use in the control system. - View Dependent Claims (11, 12, 13, 14)
- a method of determining a single output value of said parameter for use in the control system, comprising the steps of;
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17. A gas turbomachine including:
- redundant sensors producing at least two sensed values of a single parameter associated with turbomachine operation;
means for generating a synthesized value of said parameter;
a control system for the turbomachine, said control system receiving said two sensed values and said synthesized value; and
means for producing a single output value of said parameter for further use in the control system, comprising;a first comparator for comparing said sensed values to one another to generate a first error signal; a second comparator for comparing said sensed values to said synthesized value to generate a second error signal; a fuzzy logic look-up table for determining a graded membership of said first and second error signals; and means for calculating said single output value of said parameter as a preselected weighted average of said sensed values based on said graded membership.
- redundant sensors producing at least two sensed values of a single parameter associated with turbomachine operation;
Specification