Method and apparatus for estimating a parameter based on a plurality of redundant signals
First Claim
1. A method for estimating a parameter based on signals received from redundant sensors, the method comprising:
- receiving at least a first sensed signal and a second sensed signal from at least corresponding-first and second redundant sensors, the first sensed signal and the second sensed signal indicative of the parameter, wherein the first sensed signal has associated therewith a first accuracy, wherein the second sensed signal has associated therewith a second accuracy;
receiving at least a reference signal indicative of the parameter, wherein the reference signal has associated therewith a reference accuracy;
determining a weighting based on at least the first sensed signal, the second sensed signal, and based on at least one of the first accuracy, the second accuracy, and the reference accuracy; and
generating an estimate of the parameter as a weighted average, according to the weighting, of at least a value of the first sensed signal, a value of the second sensed signal, and a value of the reference signal.
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Abstract
In a method for estimating a parameter based on signals received from redundant sensors, at least a first sensed signal and a second sensed signal are received from at least corresponding first and second redundant sensors. The first sensed signal and the second sensed signal are indicative of the parameter, wherein the first sensed signal has associated therewith a first accuracy, wherein the second sensed signal has associated therewith a second accuracy. At least a reference signal indicative of the parameter is received, wherein the reference signal has associated therewith a reference accuracy. A weighting is determined based on at least the first sensed signal, the second sensed signal, and based on at least one of the first accuracy, the second accuracy, and the reference accuracy. An estimate of the parameter is generated as a weighted average, according to the weighting, of at least a value of the first sensed signal, a value of the second sensed signal, and a value of the reference signal.
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Citations
51 Claims
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1. A method for estimating a parameter based on signals received from redundant sensors, the method comprising:
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receiving at least a first sensed signal and a second sensed signal from at least corresponding-first and second redundant sensors, the first sensed signal and the second sensed signal indicative of the parameter, wherein the first sensed signal has associated therewith a first accuracy, wherein the second sensed signal has associated therewith a second accuracy;
receiving at least a reference signal indicative of the parameter, wherein the reference signal has associated therewith a reference accuracy;
determining a weighting based on at least the first sensed signal, the second sensed signal, and based on at least one of the first accuracy, the second accuracy, and the reference accuracy; and
generating an estimate of the parameter as a weighted average, according to the weighting, of at least a value of the first sensed signal, a value of the second sensed signal, and a value of the reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for estimating a parameter based on signals received from redundant sensors, the apparatus comprising:
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a weighting calculator to generate weighting information in response to a first sensed signal, a second sensed signal, a reference signal, the weighting information based on a first accuracy associated with the first sensed signal, a second accuracy associated with the second sensed signal, and a reference signal accuracy associated with the reference signal;
wherein the first sensed signal is indicative of the parameter and corresponds to a first redundant sensor, wherein the second sensed signal is indicative of the parameter and corresponds to a second redundant sensor, and wherein the reference signal is indicative of the parameter; and
a weighted average calculator to generate an estimate of the parameter based on the first sensed signal, the second sensed signal, the reference signal, and the weighting information. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. A method for estimating a parameter based on signals received from redundant sensors, the method comprising:
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receiving at least a first sensed signal and a second sensed signal from at least corresponding first and second redundant sensors, the first sensed signal and the second sensed signal indicative of the parameter, wherein the first sensed signal has associated therewith a first accuracy, wherein the second sensed signal has associated therewith a second accuracy;
receiving at least a reference signal indicative of the parameter, wherein the reference signal has associated therewith a reference accuracy;
generating a first error magnitude signal based on at least the first sensed signal and the reference signal;
generating a second error magnitude signal based on at least the second sensed signal and the reference signal;
normalizing the first error magnitude signal, based on at least the first accuracy, the second accuracy, and the reference accuracy;
normalizing the second error magnitude signal, based on at least the first accuracy, the second accuracy, and the reference accuracy;
evaluating a fuzzy rulebase based on at least the normalized first error magnitude signal and the normalized second error magnitude signal; and
generating an estimate of the parameter based on at least the evaluated fuzzy rulebase. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. An apparatus for estimating a parameter based on signals received from redundant sensors, the apparatus comprising:
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an error magnitude calculator to generate a first error magnitude signal and a second error magnitude signal in response to a first sensed signal received from a first redundant sensor, a second sensed signal received from a second redundant sensor, and a reference signal, the first sensed signal, the second sensed signal, and the reference signal indicative of the parameter;
a normalizer to generate a first normalized error magnitude signal and a second normalized error magnitude signal in response to the first error magnitude signal and the second error magnitude signal, and based on a first accuracy associated with the first sensed signal, a second accuracy associated with the second sensed signal, and a reference signal accuracy associated with the reference signal;
a fuzzy logic estimate calculator to generate an estimate of the parameter in response to the first normalized error magnitude signal and the second normalized error magnitude signal, and according to a fuzzy rulebase. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47)
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48. An engine control system, comprising:
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a first redundant sensor to generate a first sensed signal indicative of a parameter associated with an aircraft engine, the first sensed signal having a first accuracy associated therewith;
a second redundant sensor to generate a second sensed signal indicative of the parameter, the second sensed signal having a second accuracy associated therewith;
a reference signal generator to generate a reference signal indicative of the parameter, the reference signal having a reference signal accuracy associated therewith;
a weighting calculator operatively coupled to the first redundant sensor, the second redundant sensor, and the reference signal generator to generate weighting information in response to the first sensed signal, the second sensed signal, and the redundant signal, the weighting information based on the first accuracy, the second accuracy, and the reference signal accuracy;
a weighted average calculator to generate an estimate of the parameter in response to the first sensed signal, the second sensed signal, the redundant signal, and the weighting information. - View Dependent Claims (49)
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50. An engine control system, comprising:
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a first redundant sensor to generate a first sensed signal indicative of a parameter associated with an aircraft engine, the first sensed signal having a first accuracy associated therewith;
a second redundant sensor to generate a second sensed signal indicative of the parameter, the second sensed signal having a second accuracy associated therewith;
a reference signal generator to generate a reference signal indicative of the parameter, the reference signal having a reference signal accuracy associated therewith;
an error magnitude calculator operatively coupled to the first redundant sensor, the second redundant sensor, and the reference signal generator to generate a first error magnitude signal and a second error magnitude signal in response to the first sensed signal, the second sensed signal, and the reference signal;
a normalizer to generate a first normalized error magnitude signal and a second normalized error magnitude signal in response to the first error magnitude signal and the second error magnitude signal and based on the first accuracy;
, the second accuracy, and the reference signal accuracy;
a fuzzy logic estimate calculator to generate an estimate of the parameter in response to the first normalized error magnitude signal and the second normalized error magnitude signal, and according to a fuzzy rulebase. - View Dependent Claims (51)
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Specification