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;
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;
generating a first error magnitude signal based on the first sensed signal and the second sensed signal;
generating a second error magnitude signal based on the first sensed signal and the reference signal;
generating a third error magnitude signal based on the second sensed signal and the reference signal;
conveying the estimate of the parameter as a value of at least the first sensed signal or the second sensed signal,wherein determining the weighting and generating the estimate of the parameter comprises;
determining the estimate of the parameter as a value of the first sensed signal if a value of the first error magnitude signal is greater than a threshold and if a value of the second error magnitude signal is less than a value of the third error magnitude signal, wherein the threshold is based on the reference accuracy; and
determining the estimate of the parameter as a value of the second sensed signal if the value of the first error magnitude signal is greater than the threshold and if the value of the second error magnitude signal is more than the value of the third error magnitude 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.
15 Citations
46 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; 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; generating a first error magnitude signal based on the first sensed signal and the second sensed signal; generating a second error magnitude signal based on the first sensed signal and the reference signal; generating a third error magnitude signal based on the second sensed signal and the reference signal; conveying the estimate of the parameter as a value of at least the first sensed signal or the second sensed signal, wherein determining the weighting and generating the estimate of the parameter comprises; determining the estimate of the parameter as a value of the first sensed signal if a value of the first error magnitude signal is greater than a threshold and if a value of the second error magnitude signal is less than a value of the third error magnitude signal, wherein the threshold is based on the reference accuracy; and determining the estimate of the parameter as a value of the second sensed signal if the value of the first error magnitude signal is greater than the threshold and if the value of the second error magnitude signal is more than the value of the third error magnitude signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for estimating a parameter based on signals received from redundant sensors, the apparatus comprising:
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a weighting generator 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 weighting generator comprises an error magnitude calculator to calculate a first error magnitude signal based on the first sensed signal and the second sensed signal, a second error magnitude signal based on the first sensed signal and the reference signal, and a third error magnitude signal based on the first sensed signal, the second sensed signal, and the reference signal; and
an estimate selector to generate an indication of one of a plurality of potential estimates of the parameter in response to the first error magnitude signal, the second error magnitude signal, and the third error magnitude signal, and based on the first accuracy, the second accuracy, and the reference signal accuracy;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 (16, 17, 18, 19, 20)
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21. 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 an the reference signal; normalizing the first error magnitude signal, based on at least the first accuracy, the second accuracy, and the reference accuracy, prior to determining the degrees of membership of the value of the second error magnitude signal; normalizing the second error magnitude signal, based on at least the first accuracy, the second accuracy, and the reference accuracy, prior to determining the degrees of membership of the value of the third error magnitude signal; evaluating a fuzzy rulebase based on at least the normalized first error magnitude signal and the normalized second error magnitude signal; generating an estimate of the parameter based on at least the evaluated fuzzy rulebase; and conveying the estimate of the parameter as a value of at least the first sensed signal or the second sensed signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. 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 first 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, wherein the normalizer generates the first normalized error magnitude signal as the first error magnitude signal divided by the reference signal accuracy added with the first accuracy, wherein the normalizer generates the second normalized error magnitude signal as the second error magnitude signal divided by the reference signal accuracy added with the second 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, wherein the fuzzy logic estimate calculator comprises a fuzzy membership evaluator to generate first degrees of membership n a first plurality of fuzzy sets for the first normalized error magnitude sign and to generate second degrees of membership in a second plurality of fuzzy sets for the second normalized error magnitude signal. - View Dependent Claims (38, 39, 40, 41, 42)
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43. 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 generator 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, wherein the weighting generator comprises an error magnitude calculator to calculate a first error magnitude signal based on the first sensed signal and the second sensed signal, a second error magnitude signal based on the first sensed signal and the reference signal, and a third error magnitude signal based on the first sensed signal, the second sensed signal, and the reference signal; and
an estimate selector to generate an indication of one of a plurality of potential estimates of the parameter in response to the first error magnitude signal, the second error magnitude signal, and the third error magnitude signal, and based on the first accuracy, the second accuracy, and the reference signal accuracy. - View Dependent Claims (44)
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45. 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, wherein the normalizer generates the first normalized error magnitude signal as the first error magnitude signal divided by the reference signal accuracy added with the first accuracy, wherein the normalizer generates the second normalized error magnitude signal as the second error magnitude signal divided by the reference signal accuracy added with the second 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, wherein the fuzzy logic estimate calculator comprises a fuzzy membership evaluator to generate first degrees of membership n a first plurality of fuzzy sets for the first normalized error magnitude sign and to generate second degrees of membership in a second plurality of fuzzy sets for the second normalized error magnitude signal. - View Dependent Claims (46)
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Specification