State and parameter estimator having integral and differential components for electrical energy accumulators

• US 20090048793A1
• Filed: 05/31/2005
• Published: 02/19/2009
• Est. Priority Date: 07/23/2004
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Schoch, Eberhard
• Granted Patent: US 8,099,180 B2
• Time in Patent Office: Days
• US Class Current: 702/63
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements

Abstract

A device is described for ascertaining state variables and/or parameters of a mathematical energy accumulator model, in particular a battery model, that describes the electrical properties of the energy accumulator on the basis of various state variables and parameters, the mathematical energy accumulator model having correction equations by which the state variables and/or the parameters are corrected and adjusted to the actual operating performance of the energy accumulator. A particularly rapid and accurate compensation of the energy accumulator model may be achieved if the error between a measured battery performance quantity and the battery performance quantity calculated by the energy accumulator models, a differentiated component of the error and an integrated component of the error are calculated, the individual components are each weighted using a weighting factor and the weighted error components are taken into account in correction of a state variable and/or a parameter.

Claims

1-9. -9. (canceled)

10. A device for ascertaining state variables and/or parameters of a mathematical energy accumulator model corresponding to a battery model that describes the electrical properties of the energy accumulator on the basis of various state variables and parameters, the energy accumulator model having correction equations by which the state variables and/or the parameters are corrected and adjusted to the actual operating performance of the energy accumulator, the device comprising:

an arrangement for calculating the absolute error between a measured battery performance quantity and a battery performance quantity calculated by the energy accumulator model, a differentiated component of the error and an integrated component of the error;

an arrangement for weighting the proportional component, the differentiated component, and the integrated component using a weighting factor; and

an arrangement for feeding back the weighted components into the energy accumulator model for correction of the state variables and/or the parameters.

11. The device as recited in claim 10, wherein the weighting of the proportional component, the integrated component and/or the differentiated component is performed as a function of the operating point.

12. The device as recited in claim 10, wherein the energy accumulator model is implemented as a universal model that is valid for the entire operating range of the energy accumulator.

13. The device as recited in claim 11, wherein the weighting of the individual error components as a function of the operating point is implemented in such a way that the state variable and/or the parameter, which at the respective operating point has the greatest effect on the time characteristic, the integral characteristic or the differential characteristic of the performance quantity to be adjusted, is corrected to the greatest extent.

14. The device as recited in claim 11, wherein the proportional component, the integral component and/or the differential component of the error are weighted differently during charging of the battery than during discharging of the battery.

15. A method for ascertaining state variables and/or parameters of a mathematical energy accumulator model corresponding to a battery model that describes the electrical properties of an energy accumulator on the basis of various state variables and parameters, the mathematical energy accumulator model having correction equations by which the state variables and/or the parameters are corrected and adjusted to the actual operating performance of the battery, the method comprising:

calculating the error between a measured battery performance quantity and a battery performance quantity calculated by the energy accumulator model;

calculating a differentiated component of the error and an integrated component of the error;

weighting the proportional component, the differentiated component, and the integrated component with a weighting factor; and

feeding back the weighted error components into the energy accumulator model for correction of the state variables and/or the parameters.

16. The method as recited in claim 15, wherein the weighting of the proportional component, the integrated component, and/or the differentiated component is performed as a function of the operating point.

17. The method as recited in claim 15, wherein the energy accumulator model is implemented as a single model for the entire operating range of the energy accumulator.

18. The method as recited in claim 15, wherein the weighting of the individual error components as a function of the operating point is implemented in such a way that the state variable and/or the parameter, which at the respective operating point has the greatest effect on the time characteristic, the integral characteristic or the differential characteristic of the performance quantity to be adjusted, is corrected to the greatest extent.