Method for Operating a Hand-Held Power Tool

Patent metadata

Field	Value
Publication number	US-2023381934-A1
Application number	US-202118249713-A
Country	US
Kind code	A1
Filing date	Oct 1, 2021
Priority date	Oct 21, 2020
Publication date	Nov 30, 2023
Grant date	—

Abstract

A method for operating a hand-held power tool is disclosed, with the hand-held power tool including an electric motor. The method includes step (S 1 ) providing comparative information, having the steps of (S 1 a) providing at least one model signal waveform, said model signal waveform being assignable to the work progress of the hand-held power tool, and (S 1 b) providing a threshold of a match. The method further includes step (S 2 ) ascertaining a signal of an operational variable of the electric motor. The method also includes step (S 3 ) analyzing the comparative information and the signal of an operational variable, having the steps of (S 3 a) comparing the signal of the operational variable with the model signal waveform and ascertaining a match signal from the comparison, and (S 3 b) ascertaining a match evaluation, said match evaluation being carried out at least partly using the threshold of the match and using the match signal. In addition, the method includes step (S 4 ) detecting the work progress at least partly using the match evaluation ascertained in step S 3 , said comparative information being provided at least partly on the basis of an automatic evaluation of the match signal. An associated hand-held power tool is also disclosed.

First claim

1 . A method for operating a hand-held power tool, the hand-held power tool having an electric motor, the method comprising:
(S 1 ) providing comparative information, having the steps of:
(S 1 a ) providing at least one model signal waveform, said model signal waveform being assignable to a work progress of the hand-held power tool, and
(S 1 b ) providing a threshold of a match;
(S 2 ) ascertaining a signal of an operational variable of the electric motor; (S 3 ) analyzing the comparative information and the signal of an operational variable, having the method steps of:
(S 3 a ) comparing the signal of the operational variable with the model signal waveform and ascertaining a match signal from the comparison, and
(S 3 b ) ascertaining a match evaluation, said match evaluation being carried out at least partly using the threshold of the match and using the match signal; and
(S 4 ) detecting the work progress at least partly using the match evaluation ascertained in step (S 3 ), wherein said comparative information being provided at least partly on the basis of an automatic evaluation of the match signal.

2 . The method according to claim 1 , wherein the evaluation of the match signal at least partly includes ascertaining a gradient of the match signal.

3 . The method according to claim 2 , wherein the threshold of the match is determined at least partly on the basis of the gradient of the match signal.

4 . The method according to claim 1 , wherein the match evaluation in method step (S 3 b ) is carried out at least partly using a frequency of the signal of the operational variables as a function of a frequency threshold.

5 . The method according to 4 , wherein the match evaluation in method step (S 3 b ) is carried out at least partly on the basis of a logical linkage of the match signal and the frequency of the signal of the operational variable.

6 . The method according to claim 5 , wherein the match evaluation in method step (S 3 b ) is carried out at least partly on the basis of a sum signal of the match signal and the frequency of the signal of the operational variable.

7 . The method according to claim 1 , wherein the operational variable is a speed of the electric motor or an operational variable correlating to the speed.

8 . The method according to claim 1 , further comprising:
(s 5 ) executing a first routine of the hand-held power tool based at least partly on the work progress detected in method step (S 4 ).

9 . The method according to claim 8 , wherein the first routine includes a reduction and/or an increase of a speed of the electric motor.

10 . The method according to claim 9 , wherein an amplitude of the change in the speed of the electric motor and/or a target value of the speed of the electric motor (is configured to be defined by a user of the hand-held power tool.

11 . The method according to claim 9 , wherein the change in the speed of the electric motor occurs staggered over time and/or along a characteristic curve of the speed change and/or as a function of the work progress of the hand-held power tool.

12 . The method according to claim 8 , wherein the first routine comprises an adjustment of a speed value of the electric motor and a substantial constant maintenance of the speed value.

13 . The method according to claim 8 , wherein the first routine and/or characteristic parameters of the first routine is configured to be adjusted and/or displayed by a user via an application software (“app”) or a user interface (“human-machine interface,” “HMI”).

14 . The method according to claim 1 , further comprising:
(AM) setting a upper speed limit of the electric motor.

15 . The method according to claim 1 , wherein a work progress is output to a user of the hand-held power tool using an output apparatus of the hand-held power tool.

16 . The method according to claim 1 , wherein the model signal waveform is a substantially trigonometric vibration curve.

17 . The method according to claim 1 , wherein the signal of the operational variable is incorporated in method step (S 2 ) as a time curve of measured values of the operational variable, or as measured values of the operational variable as a variable of the electric motor correlated with the time curve.

18 . The method according to claim 1 , wherein the signal of the operational variable is incorporated in method step (S 2 ) as a time curve of measured values of the operational variable and, in a method step (S 2 a ) following the method step (S 2 ), there is a transformation of the time curve of the measured values of the operational variable into a curve of the measured values of the operational variable as a variable of the electric motor correlated with the time curve.

19 . The method according to claim 1 , wherein the comparison of the signal of the operational variable to the model signal waveform includes at least one frequency-based comparison method and/or one comparative comparison method.

20 . The method according to claim 1 , wherein the hand-held power tool is a rotary percussive screwdriver, and the work progress is a start or end of a rotary percussive operation.

21 . (canceled)

Assignees

• Bosch Gmbh Robert

Inventors

• Erbele Simon
• Mock Stefan
• Herberger Wolfgang
• Giessler Jasmin

Classifications

• B25B23/1475 Primary

  for impact wrenches or screwdrivers · CPC title

• B25B23/147 Primary

  specially adapted for electrically operated wrenches or screwdrivers · CPC title

• H02P7/06 Primary

  for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current · CPC title

• H02P6/08

  Arrangements for controlling the speed or torque of a single motor (H02P6/10, H02P6/28 take precedence) · CPC title

• Y10S388/937

  Hand tool · CPC title