EP4489938A1 - Procédé pour faire fonctionner un outil électrique portatif - Google Patents

Procédé pour faire fonctionner un outil électrique portatif

Info

Publication number
EP4489938A1
EP4489938A1 EP23704096.9A EP23704096A EP4489938A1 EP 4489938 A1 EP4489938 A1 EP 4489938A1 EP 23704096 A EP23704096 A EP 23704096A EP 4489938 A1 EP4489938 A1 EP 4489938A1
Authority
EP
European Patent Office
Prior art keywords
signal
electric motor
operating
hand
threshold value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23704096.9A
Other languages
German (de)
English (en)
Inventor
Wolfgang Herberger
Marcus Schuller
Simon Erbele
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP4489938A1 publication Critical patent/EP4489938A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose

Definitions

  • a reaction purely based on the state of the rotary impact mechanism is therefore not effective for a correct automatic system function, such as switching off the hand-held power tool.
  • some applications pose a challenge in terms of detecting work progress during screwing, in particular screwing in inhomogeneous materials, for example concrete screwing or screwing in a reinforced concrete wall that contains concrete, stones and iron.
  • An object of the present invention is to provide an improved method for operating a hand-held power tool and to provide an improved hand-held power tool.
  • This task is solved by a method for operating a hand-held power tool and a hand-held power tool with the features of the respective independent claims.
  • Advantageous further developments are specified in dependent claims.
  • a method for operating a hand-held power tool with an electric motor includes the following method steps.
  • a model signal of an operating variable of the electric motor is used.
  • a signal of the operating size of the electric motor is recorded.
  • the captured signal is compared with the model signal by determining a comparison parameter based on the captured signal and the model signal.
  • the comparison parameter is compared with a first predeterminable threshold value.
  • An amplitude of the signal of the operating variable is determined.
  • the determined amplitude is compared with a second predeterminable threshold value.
  • a work progress of the hand-held power tool is determined based on the comparison of the determined comparison parameter with the first threshold value and the comparison of the determined
  • the first threshold and the second threshold refer to different sizes.
  • the first threshold value is defined in such a way that it can be compared with the comparison parameter.
  • the second threshold value is defined such that it can be compared with the amplitude of the operating variable signal.
  • the method makes it possible for the work progress when operating the hand-held power tool, for example work progress when screwing a screw using the hand-held power tool, to be reliably recognized even for a screw connection in an inhomogeneous material.
  • an operating state of the electric motor is adjusted depending on the progress of work.
  • the hand-held power tool is therefore operated by determining the work progress and adjusting the operating state of the electric motor depending on the work progress.
  • a suitable reaction to the work progress can take place, especially when screwing in inhomogeneous materials (e.g. concrete). This means that even with inhomogeneous materials, an application-related reaction of the hand tool to the work progress is possible.
  • a suitable and application-related reaction can, for example, prevent damage to a screw or the material into which it is to be screwed.
  • work with the hand-held power tool can be carried out more quickly, which leads to higher productivity for a user.
  • the operating state of the electric motor is adjusted if the determined comparison parameter is smaller than the first threshold value and the determined amplitude of the signal of the operating variable is greater than the second threshold value.
  • a head contact of a screw head on a material to be screwed can be recognized as part of a screw connection.
  • the amplitude of the signal of the operating variable is determined based on the comparison parameter or on the basis of a comparison parameter estimate.
  • adjusting the operating state of the electric motor includes adjusting the operating size or an operating size profile of the electric motor.
  • the operating variable is a speed of the electric motor or an operating variable correlated with the speed.
  • the model signal has an oscillating profile. Such a model signal advantageously represents an impact operation of an impact wrench or rotary impact wrench, so that the impact operation can be reliably recognized.
  • a mean square deviation or a cross-correlation is determined as a comparison parameter.
  • a hand tool includes an electric motor with a sensor and a control device.
  • the sensor is designed to detect a signal of an operating variable of the electric motor.
  • the control device is designed to carry out a method according to one of the mentioned embodiments. The method for operating a hand-held power tool is explained below in connection with schematic drawings. Show it:
  • Fig. 1 Method steps of a method 1 for operating a hand-held power tool
  • Fig. 2 a sequence of different work progresses when screwing a screw into an inhomogeneous material in a cross-sectional view
  • Fig. 3 a hand tool.
  • Fig. 1 shows schematically process steps of a method 100 for operating a hand-held power tool.
  • the hand tool includes an electric motor.
  • the hand-held power tool can be designed, for example, as an impact wrench, in particular as a rotary impact wrench.
  • the hand-held power tool can be designed as any hand-held power tool with an electric motor, in particular as a hand-held power tool in which detection of work progress is relevant.
  • the hand-held power tool can be designed as an impact drill.
  • a model signal of an operating variable of the electric motor is provided and used.
  • the operating variable of the electric motor is, for example, a speed of the electric motor.
  • the operating variable can also be an operating variable that is correlated with the speed.
  • the model signal can, for example, be provided in a memory of the hand-held power tool.
  • the model signal can also be provided externally, for example via a terminal that is connected to the hand-held power tool via a wireless connection.
  • the model signal can be segmented if this is appropriate. However, sequencing the model signal is not absolutely necessary.
  • the model signal of the operating variable can, for example, have an oscillating profile.
  • An oscillating model signal of the operating variable can be represented, for example, by a trigonometric signal profile.
  • the oscillating model signal represents, for example, an impact operation of the impact wrench or rotary impact wrench.
  • the model signal can, for example, be selected such that the operating variable is plotted as a function of time.
  • another variable such as a motor rotation angle of the electric motor can be selected as a reference variable.
  • the exemplary model signal includes a first region which is characterized by a monotonous increase in the size of the business and a section in which the size of the business is approximately constant. In the first area, the rotary impact wrench works without impact.
  • the rotary impact wrench works in a rotary impact operation.
  • the rotary impact operation is characterized by an oscillating course of the operating variable, whereby the form of the oscillation can be, for example, trigonometric, such as sinusoidal, or otherwise oscillating.
  • This characteristic form of operating size in impact wrench operation is created by the winding and free-running of an impact mechanism and a system chain located between the impact mechanism and the electric motor, including the gearbox.
  • a signal of the operating variable of the electric motor is detected.
  • the electric motor has a sensor for detection the signal of an operating variable of the electric motor.
  • the speed of the electric motor can be detected, for example, using a Hall sensor.
  • a fourth method step 104 the detected signal of the operating variable is compared with the model signal of the operating variable. This is done by determining a comparison parameter based on the captured signal and the model signal.
  • a comparison parameter for example, a mean square deviation or a cross-correlation can be determined based on the model signal of the operating variable and the recorded signal of the operating variable.
  • another comparison parameter can also be determined.
  • the comparison parameter is compared with a first predeterminable threshold value.
  • the first predeterminable threshold value can be set as part of an optional sixth method step 106, for example by a user of the hand-held power tool.
  • the user can set the first threshold value, for example, via a terminal of the hand-held power tool or via a control panel of the hand-held power tool.
  • the first threshold value can, for example, be stored in the memory of the hand-held power tool.
  • an amplitude of the signal of the operating variable is determined.
  • the amplitude of the signal of the operating variable can be determined, for example, on the basis of the comparison parameter or on the basis of an estimate of the comparison parameter, i.e. based on the calculation of the comparison parameter.
  • the amplitude can be determined in any way based on the signal of the operating quantity.
  • the model signal can be taken into account, but this is not absolutely necessary.
  • the determined amplitude is compared with a second predeterminable threshold value.
  • the second threshold value can be stored in the memory of the hand-held power tool or can be set in an optional ninth method step 109 on the hand-held power tool or via a terminal.
  • a work progress of the hand-held power tool is determined based on the comparison of the determined comparison parameter with the first threshold value and the comparison of the determined amplitude with the second threshold value. Determining the work progress includes checking whether the comparison parameter is smaller or larger than the first threshold and whether the amplitude is smaller or larger than the second threshold. For example, a head contact of a screw head of a screw on the material to be screwed can be recognized by the fact that the comparison parameter is smaller than the first threshold value and the amplitude is larger than the second threshold value.
  • an operating state of the electric motor is adjusted depending on the work progress, i.e. there is a reaction to the work progress, for example the work progress of a screw connection.
  • Adjusting the operating state of the electric motor can include, for example, adjusting the operating size or an operating size profile of the electric motor. This can include, for example, changing the speed, i.e. increasing the speed, reducing the speed or stopping the electric motor. For example, a reversal of direction of the electric motor can also be initiated in response to work progress.
  • the operating variable profile can, for example, be adapted in such a way that it represents, for example, at least in sections, a constant increase in the operating variable or, for example, an oscillating operating variable with a predeterminable impact frequency for impact operation of the hand-held power tool.
  • a lamp of the hand-held power tool can be designed to light up when a certain amount of work progress has been achieved. For example, it may be that within the framework of the method 100, with regard to the work progress, it is determined that a head contact has been achieved during a screw connection, ie that a screw has been inserted so far into a screw connection Material has been screwed until a screw head rests on the material into which the screw is screwed.
  • Such a head rest can be recognized, for example, by the fact that the determined comparison parameter is smaller than the first threshold value and the determined amplitude of the signal of the operating variable is greater than the second threshold value.
  • the operating state of the electric motor can then be adjusted. If the determined comparison parameter is smaller than the first threshold value, this means that the detected signal matches the model signal to a sufficient degree of accuracy. This can, for example, signal proper impact operation of the hand-held power tool. If the amplitude of the operating variable is now also greater than the second threshold value, this can signal a head rest, for example.
  • FIG. 2 shows schematically an exemplary sequence 200 of different work progresses when screwing a screw 206 into an inhomogeneous material 207 in a cross-sectional view.
  • a screw 206 into an inhomogeneous material 207 in a cross-sectional view.
  • the inhomogeneous material 207 is, for example, concrete or reinforced concrete.
  • a blind hole 208 drilled before screwing on the screw 206 is not shown in FIG. 2, but is merely indicated.
  • the screw 206 is applied.
  • the hand tool is not yet in impact mode.
  • the comparison parameter is greater than the first threshold value at the first time point 201.
  • the amplitude is smaller than the second threshold value.
  • the screw 206 has already been partially screwed into the inhomogeneous material 207.
  • the hand-held power tool begins impact operation.
  • the comparison parameter is smaller than the first threshold value.
  • the amplitude of the operating variable is smaller than the second threshold value at the second time point 202. Head support has not yet been achieved.
  • the screw 206 has been screwed further into the inhomogeneous material 207. In this area, the inhomogeneous material 207 has, for example, a pebble or steel.
  • the comparison value is smaller than the first threshold value.
  • the hand tool is in impact mode.
  • the amplitude is increased compared to the second time point 202, but is not greater than the second threshold value. For this reason, a headrest has not yet been recognized.
  • the screw 206 has been screwed further into the inhomogeneous material 207.
  • the comparison parameter is smaller than the first threshold value.
  • the amplitude is smaller than the second threshold value, since head contact of a screw head 210 on the inhomogeneous material 207 has not yet been achieved.
  • the screw 206 has been completely screwed in.
  • the screw head 210 rests on a surface 211 of the inhomogeneous material 207.
  • the comparison parameter is smaller than the first threshold value.
  • the amplitude is greater than the second threshold value. The head rest has been reached and is recognized correctly. Based on this work progress, a reaction can now be made and the operating state of the electric motor can be adjusted.
  • Fig. 3 shows schematically a hand-held power tool 10.
  • the hand-held power tool 10 has, in addition to the electric motor 11 with the sensor 12 for detecting the signal of the operating variable and the memory 13, a control device 14.
  • the control device 14 is designed to determine the comparison parameter and to compare the comparison parameter with the first threshold value.
  • the control device 14 is further designed to determine the amplitude of the signal of the operating variable and to compare the determined amplitude of the signal of the operating variable with the second threshold value.
  • the control device 14 is also designed to determine work progress depending on the comparisons and to signal the work progress, for example by turning on a lamp Hand tool tool 10 activated and indicates the work progress by lighting or flashing.
  • the control device 14 can also be designed to initiate a reaction, ie to adapt the operating size of the electric motor 11, if the comparison parameter is smaller than the first threshold value and the determined amplitude is greater than the second threshold value.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

L'invention concerne un procédé (100) pour faire fonctionner un outil électrique portatif (10) comprenant un moteur électrique (11), le procédé comprenant les étapes de procédé suivantes. Un signal modèle d'une grandeur de fonctionnement du moteur électrique (11) est utilisé. Un signal de la grandeur de fonctionnement du moteur électrique (11) est détecté. Le signal détecté est comparé au signal modèle en déterminant un paramètre de comparaison sur la base du signal détecté et du signal modèle. Le paramètre de comparaison est comparé à une première valeur seuil pouvant être spécifiée. Une amplitude du signal de la grandeur de fonctionnement est déterminée. L'amplitude déterminée est comparée à une seconde valeur seuil pouvant être spécifiée. La progression de travail de l'outil électrique portatif (10) est déterminée sur la base de la comparaison du paramètre de comparaison déterminé à la première valeur seuil et de la comparaison de l'amplitude déterminée à la seconde valeur seuil.
EP23704096.9A 2022-03-10 2023-02-07 Procédé pour faire fonctionner un outil électrique portatif Pending EP4489938A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022202416.8A DE102022202416A1 (de) 2022-03-10 2022-03-10 Verfahren zum Betreiben einer Handwerkzeugmaschine
PCT/EP2023/052925 WO2023169756A1 (fr) 2022-03-10 2023-02-07 Procédé pour faire fonctionner un outil électrique portatif

Publications (1)

Publication Number Publication Date
EP4489938A1 true EP4489938A1 (fr) 2025-01-15

Family

ID=85202117

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23704096.9A Pending EP4489938A1 (fr) 2022-03-10 2023-02-07 Procédé pour faire fonctionner un outil électrique portatif

Country Status (4)

Country Link
EP (1) EP4489938A1 (fr)
CN (1) CN118891133A (fr)
DE (1) DE102022202416A1 (fr)
WO (1) WO2023169756A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019211303A1 (de) * 2019-07-30 2021-02-04 Robert Bosch Gmbh Verfahren zur Erkennung eines Arbeitsfortschrittes einer Handwerkzeugmaschine
DE102019215415A1 (de) * 2019-10-09 2021-04-15 Robert Bosch Gmbh Verfahren zum Einlernen von Anwendungsabschaltungen mit Hilfe des Auffindens von charakteristischen Signalformen bei einem Betrieb einer Handwerkzeugmaschine
DE102019215417A1 (de) 2019-10-09 2021-04-15 Robert Bosch Gmbh Verfahren zum Betrieb einer Handwerkzeugmaschine

Also Published As

Publication number Publication date
WO2023169756A1 (fr) 2023-09-14
CN118891133A (zh) 2024-11-01
DE102022202416A1 (de) 2023-09-14

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