Method and apparatus for diagnosing a current sensor in an electrically operated technical device having a device battery

Patent metadata

Field	Value
Publication number	US-12540981-B2
Application number	US-202418415815-A
Country	US
Kind code	B2
Filing date	Jan 18, 2024
Priority date	Jan 25, 2023
Publication date	Feb 3, 2026
Grant date	Feb 3, 2026

Abstract

A method for determining a current sensor offset of a current sensor ( 47 ) in a device battery ( 41 ) of a technical device ( 4 ). In one example, the method includes measuring the battery current using the current sensor ( 47 ); providing (S 1 ) a temporal profile of the battery current; recording (S 2 ) a charge balance of the electrical charge amount flowing into the device battery ( 41 ) and out of the device battery ( 41 ) over time depending on the temporal profile of the battery current; creating (S 2 ) or adjusting a charge balance model depending on a time-accumulated charge amount; and determining the current sensor offset depending on a local slope of the charge balance model at a specified time.

First claim

The invention claimed is:

1 . A method for determining a current sensor offset of a current sensor ( 47 ) in a device battery ( 41 ) of a technical device ( 4 ), the method comprising:
measuring a battery current using the current sensor ( 47 ); providing (S 1 ) a temporal profile of the battery current to a central processing unit ( 2 ) via a communication system ( 44 ) of the technical device ( 4 ); recording (S 2 ) a charge balance of an electrical charge amount flowing into the device battery ( 41 ) and out of the device battery ( 41 ) over time depending on the temporal profile of the battery current; creating (S 2 ) or adjusting a charge balance model depending on a time-accumulated charge amount; and determining the current sensor offset depending on a slope of the charge balance model at a time, wherein the current sensor offset is transmitted to the communication system ( 44 ) of the technical device ( 4 ) to perform, via a control unit ( 43 ), device functions to automatically reduce a mechanical stress experienced by the device battery ( 41 ) based on an evaluation of the battery current depending on the current sensor offset.

2 . The method according to claim 1 , wherein the central processing unit ( 2 ) is remote from the technical device ( 4 ).

3 . The method according to claim 1 , wherein a remaining service life of the current sensor is determined (S 3 ) by the central processing unit ( 2 ) and an indication is provided by the central processing unit ( 2 ) (S 4 ), wherein a remaining service life (RUL) of the current sensor ( 47 ) is determined by extrapolation of the charge balance model over time, wherein the remaining service life (RUL) results as a time period until a predetermined maximum accumulated charge balance is reached, wherein the indication is provided by the central processing unit ( 2 ) when the remaining service life falls below a predetermined threshold value.

4 . The method of claim 3 , wherein the indication is provided to a user of the technical device ( 4 ) and indicates that the current sensor ( 47 ) requires maintenance, recalibration, and/or replacement.

5 . The method according to claim 1 , wherein a remaining service life (RUL) of the current sensor ( 47 ) is determined and signaled, wherein the remaining service life in a data-based charge balance model is determined via a point estimator of a prediction, which describes a defined quantile of a probabilistic prediction.

6 . The method according to claim 1 , wherein the charge balance model is trained as a data-based model or fitted as a parametric model.

7 . The method according to claim 1 , wherein signaling occurs when the current sensor offset exceeds a predetermined threshold value.

8 . The method according to claim 1 , wherein the charge balance model is trained as a data-based model or fitted as a parametric model.

9 . The method according to claim 1 , wherein the charge balance model of a plurality of device batteries is evaluated to determine a dependence of the current sensor offset on a stress factor, wherein upon detection of a dependence on a stress factor, the technical device ( 4 ) is operated accordingly to reduce the stress factor, wherein operating accordingly includes automatically controlling the technical device ( 4 ) to reduce driving on uneven roadways.

10 . A device determining a current sensor offset of a current sensor ( 47 ) in a device battery ( 41 ) of a technical device ( 4 ), the device determining the current sensor offset configured to:
measure a battery current using the current sensor ( 47 ); provide (S 1 ) a temporal profile of the battery current to a central processing unit ( 2 ) via a communication system ( 44 ) of the technical device ( 4 ); record (S 2 ) a charge balance of an electrical charge amount flowing into the device battery ( 41 ) and out of the device battery ( 41 ) over time depending on the temporal profile of the battery current; create (S 2 ) or adjust a charge balance model depending on a time-accumulated charge amount; and determine the current sensor offset depending on a local of the charge balance model at a time, wherein the current sensor offset is transmitted to the communication system ( 44 ) of the technical device ( 4 ) to perform, via a control unit ( 43 ), device functions to automatically reduce a mechanical stress experienced by the device battery ( 41 ) based on an evaluation of the battery current depending on the current sensor offset.

11 . A non-transitory, computer-readable storage medium comprising instructions that, when executed by a computer, cause the computer to determine a current sensor offset of a current sensor ( 47 ) in a device battery ( 41 ) of a technical device ( 4 ), by:
measuring a battery current using the current sensor ( 47 ); providing (S 1 ) a temporal profile of the battery current to a central processing unit ( 2 ) via a communication system ( 44 ) of the technical device ( 4 ); recording (S 2 ) a charge balance of an electrical charge amount flowing into the device battery ( 41 ) and out of the device battery ( 41 ) over time depending on the temporal profile of the battery current; creating (S 2 ) or adjusting a charge balance model depending on a time-accumulated charge amount; and determining the current sensor offset depending on a slope of the charge balance model at a time, wherein the current sensor offset is transmitted to the communication system ( 44 ) of the technical device ( 4 ) to perform, via a control unit ( 43 ), device functions to automatically reduce a mechanical stress experienced by the device battery ( 41 ) based on an evaluation of the battery current depending on the current sensor offset.

Assignees

• Bosch Gmbh Robert

Inventors

• Simonis Christian
• Woll Christoph
• Crisan Ioana
• Li Shi

Classifications

• G01R35/00

  Testing or calibrating of apparatus covered by the other groups of this subclass · CPC title

• G01R31/387

  Determining ampere-hour charge capacity or SoC · CPC title

• G01R31/367

  Software therefor, e.g. for battery testing using modelling or look-up tables · CPC title

• G01R31/2829

  Testing of circuits in sensor or actuator systems (testing of apparatus for measuring electric or magnetic variables G01R35/00; testing of indicating or recording apparatus G01D; in airbag systems B60R21/0173; checking gas analysers G01N33/007; monitoring or fail-safe circuits for electromagnets H01F7/1844) · CPC title

• G01R31/374 Primary

  with means for correcting the measurement for temperature or ageing · CPC title