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US 10,502,789 B2Granted
Method and device for determining a parameter of a model of a technical installation
AssigneeInfineon Technologies AG
InventorsMichael Lunglmayr, Stefano Marsili, Christoph Unterrieder
Life of this patent
Estimating the term…
Abstract
Methods and devices for determining at least one parameter of a model of a technical installation are provided. In this case, the parameters are updated on the basis of measurements as a function of an observation matrix. The observation matrix is prescribed as a function of the model and being able, if appropriate, to depend on a time variable which can be measured.
Claims24
A method comprising:
- performing a plurality of terminal voltage measurements of a battery in a low load condition;
- using an evaluation device, estimating at least one parameter of a model that describes a relaxation of a terminal voltage of the battery over time based on the plurality of terminal voltage measurements, wherein estimating the at least one parameter comprises
- initializing at least one parameter at a prescribed value, and
- for each of the plurality of terminal voltage measurements,
- determining a model-based estimate of the terminal voltage as a function of a previous value of the at least one parameter and of at least one part of an observation matrix, the observation matrix being an observation matrix prescribed as a function of the model;
- determining an error value as a function of the model-based estimate of the terminal voltage and of a current terminal voltage measurement of the plurality of terminal voltage measurements, and
- determining an updated value of the at least one parameter as a function of the previous value of the at least one parameter, of the error value and of the at least one part of the observation matrix;
- after estimating the at least one parameter, estimating a relaxed terminal voltage based on the at least one parameter, the relaxed terminal voltage representing a future value of an open circuit voltage of the battery when the battery is completely relaxed;
- and
- determining a charging state of the battery based on the estimated relaxed terminal voltage.
7 more elements
A device comprising:
- a voltmeter configured to measure a plurality of terminal voltage measurements of a battery in a low load condition;
- and
- an evaluation device configured to estimate at least one parameter of a model that describes a relaxation of a terminal voltage of the battery over time based on the plurality of terminal voltage measurements by
- initializing at least one parameter at a prescribed value, and
- for each of the plurality of terminal voltage measurements,
- determining a model-based estimate of the terminal voltage as a function of a previous value of the at least one parameter and at least one part of an observation matrix, the observation matrix being an observation matrix prescribed as a function of the model,
- determining an error value as a function of the model-based estimate of the terminal voltage and a current terminal voltage measurement of the plurality of terminal voltage measurements, and
- determining an updated value of the at least one parameter as a function of the previous value of the at least one parameter, of the error value and of the at least one part of the observation matrix,
- wherein the device is configured, after the at least one parameter is estimated, to
- estimate a relaxed terminal voltage based on the at least one parameter, the relaxed terminal voltage representing a future value of an open circuit voltage of the battery when the battery is completely relaxed, and
- determine a charging state of the battery based on the estimated relaxed terminal voltage.
8 more elements
Dependencies are inferred from the claim text.