Method for determining a remaining service life of a hand-held power tool as well as hand-held power tool

Patent metadata

Field	Value
Publication number	US-12226885-B2
Application number	US-202318176165-A
Country	US
Kind code	B2
Filing date	Feb 28, 2023
Priority date	Mar 18, 2022
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

A method for determining a remaining service life of a hand-held power tool includes, in an operating mode detection step, detecting an operating mode of the hand-held power tool by an alignment of operating data of the hand-held power tool with a comparative value table stored on the hand-held power tool and/or by a switch position detection function of an operating mode selection switch. In a computing step, the remaining service life of the hand-held power tool is calculated via at least the operating mode and its operating time and output to a user of the hand-held power tool in an outputting step.

First claim

The invention claimed is:

1. A method for determining a remaining service life of a hand-held power tool, the method comprising:
detecting an operating mode, of a plurality of operating modes, of the hand-held power tool based on an alignment of operating data of the hand-held power tool with a comparative value table stored on the hand-held power tool;
calculating the remaining service life of the hand-held power tool via at least the detected operating mode and an operating time; and
outputting the remaining service life to a user of the hand-held power tool,
wherein the operating data includes electrical current values drawn by an electric motor of the hand-held power tool, acceleration values of the electric motor, and speed values of the electric motor during operation of the hand-held power tool,
wherein, for each operating mode of the plurality of operating modes, the comparative value table includes three average classes and three slope classes, and
wherein the operating data is allocated to at least one of the three average classes and three slope classes for each operating mode to detect the operating mode using the comparative value table.

2. The method according to claim 1 , wherein:
the detecting of the operating mode, the calculating of the remaining service life, and the outputting of the remaining service life are performed at each power-on of the hand-held power tool;
the method further comprises storing all of the operating data, detected operating modes, and/or the operating times in a memory unit of the hand-held power tool.

3. The method according to claim 2 , wherein the memory unit is a flash drive.

4. The method according to claim 1 , further comprising:
detecting the operating data of the hand-held power tool.

5. The method according to claim 4 , wherein the detecting of the operating data further comprises detecting, as the operating data, a switch position of an on/off switch of the hand-held power tool.

6. The method according to claim 1 , further comprising:
verifying a switch position of an on/off switch of the hand-held power tool.

7. The method according to claim 1 , further comprising:
creating the comparative value table based on an operating mode measurement.

8. The method according to claim 7 , wherein the creating of the comparative value table is performed prior to the production of the hand-held power tool and during a development phase.

9. The method according to claim 1 , further comprising:
updating the comparative value table at a regular time interval.

10. The method according to claim 1 , wherein, the outputting of the remaining service life further comprises displaying feedback regarding at least the remaining service life, the operating modes, and the operating times to the user via at least one of a human-machine interface and wireless transmission to a terminal device.

11. The method according to claim 1 , wherein:
a first average class and slope class is for the electrical current drawn by an electric motor of the hand-held power tool and includes a range of average electrical current and a range of slope of the electrical current,
a second average class and slope class is for the acceleration of the electric motor and includes a range of average acceleration and a range of slope of the acceleration, and
a third average class and slope class is for the speed values of the electric motor and includes a range of average speed values and a range of slope of the speed values.

12. The method according to claim 11 , further comprising:
allocating the operating data into at least one of the three average classes and the three slope classes for each operating mode of the plurality of operating modes.

13. The method according to claim 12 , wherein predetermined average classes and slope classes do not result in an allocation to an operating mode of the plurality of operating modes.

14. The method according to claim 1 , wherein the plurality of operating modes includes an idling operating mode, a drilling operating mode, a chiseling operating mode, and a hammer drilling operating mode.

15. The method according to claim 1 , further comprising:
collecting the operating data;
determining a moving average, a minimum, and a maximum of the electrical current values;
determining a slope of the electrical current values;
determining a moving average, a minimum, and a maximum of the acceleration values;
determining a slope of the acceleration values;
determining a moving average, a minimum, and a maximum of the speed values; and
determining a slope of the speed values.

16. A hand-held power tool comprising:
an electric motor;
at least one electronic apparatus comprising:
a memory unit;
an evaluation unit; and
a sensor unit configured to sense operating data including electrical current values drawn by the electric motor, acceleration values of the electric motor, and speed values of the electric motor during operation of the hand-held power tool; and

a human-machine interface,
wherein the at least one electronic apparatus is configured to:
detect an operating mode, of a plurality of operating modes, of the hand-held power tool based on an alignment of the operating data with a comparative value table stored on the hand-held power tool;
calculate the remaining service life of the hand-held power tool via at least the detected operating mode and an operating time; and
output the remaining service life to a user of the hand-held power tool,

wherein, for each operating mode of the plurality of operating modes, the comparative value table includes three average classes and three slope classes, and
wherein the operating data is allocated to at least one of the three average classes and three slope classes for each operating mode to detect the operating mode using the comparative value table.

Assignees

• Bosch Gmbh Robert

Inventors

• Maier Sebastian
• Briesenick Michael

Classifications

• G06F2119/12

  Timing analysis or timing optimisation · CPC title

• G06F2119/02

  Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA] · CPC title

• G06F2119/04

  Ageing analysis or optimisation against ageing · CPC title

• G06C3/00

  Arrangements for table look-up, e.g. menstruation table · CPC title

• G06F30/20

  Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30) · CPC title