Fault tolerant liquid measurement system using multiple-model state estimators
First Claim
1. A fault tolerant liquid measurement system comprising:
- a plurality of sensors for measuring parameters of a liquid in a container;
each said sensor generating a time varying measurement signal representative of the liquid parameter measured thereby;
means for grouping said sensors into a number of sets, each set including some sensors of another set;
means for providing current and past measurement samples of each measurement signal; and
processing means for processing said current and past measurement samples of the measurement signals of each set of sensors to determine for each set of sensors a current first estimate signal representative of a likelihood of measurement signal validity for said measurement signals of the corresponding set, and a current second estimate signal representative of liquid quantity in said container based on said current and past measurement samples of the measurement signals of the corresponding set, said processing means for determining a third estimate signal of liquid quantity in said container based on a function of said first and second estimate signals.
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Abstract
A fault tolerant liquid measurement system includes a plurality of sensors for measuring parameters of a liquid in a container; each sensor generating a measurement signal representative of the liquid parameter measured thereby. The sensors are grouped into a number of sets, each set including some sensors of another set. The measurement signals of each set of sensors are processed in a processor to determine for each set of sensors a first estimate signal representative of a likelihood of measurement signal validity for the measurement signals of the corresponding set, and a second estimate signal representative of liquid quantity in the container based on the measurement signals of the corresponding set. The processor further determines a third estimate signal of liquid quantity in the container based on a function of the first and second estimate signals.
136 Citations
56 Claims
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1. A fault tolerant liquid measurement system comprising:
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a plurality of sensors for measuring parameters of a liquid in a container;
each said sensor generating a time varying measurement signal representative of the liquid parameter measured thereby;
means for grouping said sensors into a number of sets, each set including some sensors of another set;
means for providing current and past measurement samples of each measurement signal; and
processing means for processing said current and past measurement samples of the measurement signals of each set of sensors to determine for each set of sensors a current first estimate signal representative of a likelihood of measurement signal validity for said measurement signals of the corresponding set, and a current second estimate signal representative of liquid quantity in said container based on said current and past measurement samples of the measurement signals of the corresponding set, said processing means for determining a third estimate signal of liquid quantity in said container based on a function of said first and second estimate signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. In liquid measurement apparatus comprising a plurality of sensors for measuring parameters of a liquid in a container;
- each said sensor generating a time varying measurement signal representative of the liquid parameter measured thereby, a system for detecting a faulty measurement signal comprising;
means for grouping said sensors into a number of sets, each set including some sensors of another set;
means for providing current and past measurement samples of each measurement signal; and
processing means for processing said current and past measurement samples of the measurement signals of each set of sensors to determine for each set of sensors a current signal representative of a likelihood that at least one of said measurement signals of the corresponding set is a faulty measurement signal, said processing means for detecting a faulty measurement signal of liquid quantity in said container based on a function of said likelihood signals. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
- each said sensor generating a time varying measurement signal representative of the liquid parameter measured thereby, a system for detecting a faulty measurement signal comprising;
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43. A fault tolerant liquid measurement system comprising:
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a number M of sensors for measuring parameters of a liquid in a container;
each said sensor generating a time varying measurement signal representative of the liquid parameter measured thereby;
means for grouping said M sensors into M+1 subsets, one subset including all M sensors and said other M subsets each including all of said M sensors except one and said missing sensor in each of said other M subsets is a different sensor of said M sensors;
means for providing current and past measurement samples of each measurement signal; and
processing means for processing said current and past samples of the measurement signals of each subset of sensors with a respectively corresponding algorithm based on a state estimation model to determine for each subset of sensors a first estimate signal representative of a likelihood of measurement signal validity for said measurement signals of the corresponding subset, and a current second estimate signal representative of liquid quantity in said container based on said and past samples of the measurement signals of the corresponding subset;
said processing means for determining a third estimate signal of liquid quantity in said container based on a function of said first and second estimate signals.- View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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Specification