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Fault tolerant liquid measurement system using multiple-model state estimators

  • US 6,502,042 B1
  • Filed: 10/26/2000
  • Issued: 12/31/2002
  • Est. Priority Date: 10/26/2000
  • Status: Expired due to Fees
First Claim
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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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