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EP3393710B1 - Procédé permettant de faire fonctionner un outil électrique - Google Patents

Procédé permettant de faire fonctionner un outil électrique Download PDF

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Publication number
EP3393710B1
EP3393710B1 EP16809312.8A EP16809312A EP3393710B1 EP 3393710 B1 EP3393710 B1 EP 3393710B1 EP 16809312 A EP16809312 A EP 16809312A EP 3393710 B1 EP3393710 B1 EP 3393710B1
Authority
EP
European Patent Office
Prior art keywords
power
mode
electric motor
predetermined
display
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.)
Active
Application number
EP16809312.8A
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German (de)
English (en)
Other versions
EP3393710A1 (fr
Inventor
Fanghui ZHOU
Inn Kean Chong
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3393710A1 publication Critical patent/EP3393710A1/fr
Application granted granted Critical
Publication of EP3393710B1 publication Critical patent/EP3393710B1/fr
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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

Definitions

  • the invention relates to a method for operating an electric tool according to claim 1, a control device for executing the method according to claim 11 and an electric tool according to claim 12.
  • the object of the invention is to provide an improved method for loosening a screw element with the aid of a power tool.
  • An advantage of the method described is that a connection to the screw element and the positive and / or non-positive connection of the screw element with a counterpart is taken into account when loosening. This enables a better adaptation of the performance to the current situation.
  • These advantages are achieved through the proposed method for operating an electric tool with an electric motor for loosening a screw element from a counterpart, wherein in a second section a time profile of the power is recorded for a predetermined second time period, with a change being made to a third area if the power during the second time period exceeds a second power limit and a temporal fluctuation of the power lies within a predetermined fluctuation value, a third power limit being determined as a function of the detected power in the second section, with a switch from the third section to a fourth section if the power within a predetermined third time period falls below the third performance limit, in the fourth section, the power of the electric motor is reduced by at least 30%.
  • At least two, in particular five, measurements of the power consumed by the electric motor are carried out in the second section, with a switch being made to the third section when the measured powers are within the predetermined fluctuation value. This enables a more precise detection of the existing connecting force between the screw element and the counterpart.
  • the measurements of the power are each carried out for a predetermined period of time, in particular for at least 8 milliseconds, the measured powers being averaged, with a change being made to the third section when the averaged powers are within the predetermined fluctuation value. This enables a more precise determination of the actual connection force.
  • the power is measured on the basis of a current that is absorbed by the electric motor. This allows the performance to be estimated using simple means.
  • the third power limit is determined from an averaged sum of the powers measured in the second section multiplied by a factor less than 1. In this way, a suitable determination of the third performance limit can be achieved in a simple manner.
  • the third performance limit is assigned a predetermined value if the conditions of the second section are not met within a predetermined period of time and then branches to the third section. A function of the method is thus guaranteed.
  • rotation of the rotary element is braked, in particular stopped, after a predetermined number of revolutions has been reached. This avoids a complete loosening of the screw element from the counterpart.
  • the power of the electric motor is reduced, in particular the electric motor is switched off when it is determined in the second section that the power consumed by the electric motor is below the second power limit.
  • a load-free case in which no loosening of a screw element is required can thus be recognized and energy can be saved.
  • the first performance limit is greater than the second performance limit. Tests have shown that this provides good solving methods.
  • the proposed power tool has an electric motor for rotating a rotating element, a power supply, a switch for selecting an automatic release function for releasing a screw element from a counterpart.
  • a display is provided, the display indicating whether the automatic release function has been activated. This can cause a Operating function monitor the function of the power tool and is not surprised by the automatic function.
  • the display is arranged in a lower region of a handle of the power tool. This makes the display easy for the operator to see.
  • the display is designed to display at least two rotational speeds of the rotating element.
  • the switch and the display are arranged side by side.
  • Fig. 1 shows a schematic representation of an electric tool 1, which has a rotating element 2, which is provided in operative connection with a screw element for rotating the screw element, in particular for loosening the screw element from a counterpart.
  • the power tool has an electric motor 16 which is connected to a power source.
  • the power source can be provided by a rechargeable battery, ie a rechargeable battery or a power supply.
  • a rechargeable battery 3 is provided, which is arranged, for example, releasably on a lower end of a handle 4 of the power tool 1. At the upper end, the handle 4 merges into a motor housing 5, at the front end of which the rotary element 2 is formed.
  • the rotating element 2 is rotated clockwise or counterclockwise by the electric motor.
  • a button 6 is provided at the upper end of the handle 4.
  • the rotating element 2 is rotated.
  • a direction of rotation selector 7 is provided on the upper end region of the handle 4 on a side surface. The direction selector 7 specifies the direction of rotation.
  • the power tool 1 has a control unit 14, which is provided with sensors 17 for detecting the power that is output by the electric motor.
  • the power of the power tool can be estimated on the basis of the current strength consumed by the electric motor.
  • the control device 14 is connected to a data memory 15.
  • the control device 14 is designed to influence the functioning of the electric motor 16, in particular to control the power and / or to brake the rotation of the rotary element 2.
  • the electric motor 16 is supplied, for example, with a pulse width modulated voltage which is controlled by the control device.
  • a display 8 is provided at the lower end of the handle 4, which indicates to an operator whether a method for automatically loosening the screwing element is active.
  • the display 8 has corresponding optical means for displaying.
  • the display 8 lights up red in particular when the method for automatically loosening the screw element is active.
  • Fig. 2 shows the display 8 in an enlarged view, the display 8 having a display field 9 which lights up or flashes when the automatic release function is active.
  • a display field 9 which lights up or flashes when the automatic release function is active.
  • an actuation field 13 is provided, in which a button is provided. By pressing the operating field 13, the button is actuated and the selection of the automatic release method is activated.
  • Fig. 3 shows a further embodiment of the display 8, in which a speed display in the form of two further fields 10, 11 is provided in addition to the display field 9.
  • the first further display field 10 lights up when the Speed of the power tool is in a first speed range.
  • the second further display field 11 lights up when the speed of the power tool is in a second speed range, the second speed range being greater than the first speed range.
  • Fig. 4 shows a further embodiment, in which three further display fields 10, 11, 12 are provided for displaying three speed ranges.
  • the display field 9 has been omitted.
  • the actuation field 13 can be dispensed with and the automatic release function can be started automatically by a control device of the power tool if predetermined boundary conditions exist.
  • Fig. 5 shows a schematic representation of a program sequence for operating the power tool.
  • the program is started at program point 100.
  • the control device is initialized or the power tool is operated in normal operation, in which, for example, the speed of rotation of the rotating element 2 is set as a function of the depth of depression of the button 6.
  • the program for the automatic loosening of a screw element is selected and the power tool 1 is in the direction of rotation for loosening a screw element. For example, it is checked whether the operating field 13 has been pressed.
  • the determination as to whether an automatic release process is to be carried out can also be determined by the control unit on the basis of predetermined parameters which are stored in the data memory. For example, the automatic release process can always be activated when the rotating element corresponds to a loosening of a screwing element, ie when turning to the left. If this is not the case, the program branches back to program point 110.
  • program point 120 if it is recognized at program point 120 that the automatic release function is to be carried out, the program branches to program point 130.
  • program point 130 it is checked whether the button 6 is pressed. If this is not the case, the program branches back to program point 110. If the button 6 is not pressed, then no turning of the rotating element is desired. However, if the button 6 is pressed at program point 130, the program branches to program point 140.
  • the power consumed is e.g. detected with a sensor 16 or by the control unit 14 on the basis of operating parameters such as an impression depth of the button 6 is estimated.
  • the first power limit can be 20 A, for example.
  • the first power limit can depend on the type of power tool and other general conditions, e.g. are detected by the control device 14 or are stored in the data memory.
  • the first performance limit can be stored in the data memory 15. If it is recognized at program point 140 that the first performance limit has not been exceeded, the program branches to program point 150. At program point 150, it is recognized that the load is too low and the rotation of the electric motor is reduced by control unit 14, in particular the power supply of the electric motor is reduced and, for example, reduced to the value 0. The program then branches back to program point 110.
  • program point 160 detects the presence of a first section. The program then branches to program point 170.
  • a first minimum time is read out of data memory 15.
  • the first minimum time can be predetermined constantly or, depending on the first performance limit or depending on further operating parameters, can be stored in the form of a table and a characteristic curve in the data memory 15.
  • the first minimum time can be, for example, 80 ms.
  • a first time counter is started and a check is carried out to determine whether the electric motor consumes a power that is above the first power limit for longer than the predetermined first minimum time. Returns the Checking at program point 180 that the electric motor has always consumed more than the first power limit for longer than the first minimum time, then at program point 190 the presence of a second section is recognized. After program item 190, the program branches to program item 200.
  • a second time counter is started.
  • the second time period can be predefined constantly or, depending on the first performance limit or depending on further operating parameters, can be stored in the form of a table and a characteristic curve in the data memory 15.
  • the second period can e.g. 80 ms.
  • the program detects at program point 210 that the second time counter has reached the second time period, the program branches to program point 220 and a second performance limit is assigned a value which is stored in data memory 15.
  • the second power limit set at program point 220 can have different values depending on the power tool used and the present operating conditions. For example, the second performance limit can be lower than the first performance limit.
  • Program point 220 is provided to provide a second performance limit in the case of difficult-to-understand boundary conditions.
  • the program branches to program point 230.
  • program point 230 several measurements of the power consumed by the electric motor are carried out. For example, five measurements of the performance are carried out in succession. The measurements are carried out in a predetermined time window, for example within 40 ms.
  • a subsequent program step 240 it is checked whether the measurements carried out meet predetermined conditions.
  • the specified conditions are stored in the data memory. The condition is, for example, that the measured outputs must each be above a predetermined second output limit.
  • the second power limit can be 19 A, for example.
  • the predetermined value for the fluctuation can be 10% of an average power.
  • the averaged power can be determined by the sum of the averaged measured powers averaged by the number of measurements. This means that the averaged measured power may deviate less than 10% from an averaged value of the measured power to meet this condition.
  • the value for the fluctuation can be specified as a constant value and e.g. a current of 4 A.
  • the second period is so long that, for example, two or more measurement methods and evaluations can be carried out according to program points 230 and 240 before branching to program point 220.
  • a third performance limit is determined based on the measurements of the performance at program point 230.
  • the third power limit is calculated from the averaged value of the measured powers multiplied by a factor less than 1, for example 0.7.
  • other methods and calculation methods can also be used to determine the third power limit on the basis of the measured powers.
  • the program then branches to program point 260.
  • the program branches to program point 260.
  • program point 260 a third section is recognized.
  • the program then branches to program point 270.
  • program point 270 the power of the electric motor is recorded.
  • a subsequent program point 280 it is checked whether the power consumed by the electric motor is less than the third power limit for a predetermined third Duration is.
  • the third time period can be 16 ms, for example, and can be stored in the data memory 15. If the condition of program point 280 is not met, the program branches back to program point 270. However, if the condition of program point 280 is met, the program branches to program point 290 and a fourth section is recognized. After program point 290, the program branches to program point 300.
  • the control unit reduces the power of the electric motor.
  • the performance is reduced by at least 30%.
  • the electric motor can be controlled, for example, with a pulse width modulated signal.
  • the power reduction at program point 300 can also be up to 70%.
  • the number of revolutions of the rotating element 2 is counted using a further sensor 17, for example using a Hall sensor.
  • program point 310 It is then checked at program point 310 whether a predetermined number of revolutions has been reached. If this is not the case, the program branches back to program point 300. However, if it is determined at program point 310 that a predetermined number of revolutions has been carried out in the fourth section, the program branches to program point 320. At program point 320, the power of the electric motor is reduced further, in particular the electric motor is switched off. In addition, the rotating element can also be braked. For this purpose, mechanical means or a corresponding pulse-width-modulated control of the electric motor can be carried out. The end of the automatic release process is then determined at program point 330 and branched back to program point 110.
  • the predetermined number of revolutions, after which the change from program point 310 to program point 320 can be, for example, the number 4.
  • other, i.e. smaller or larger numbers of rotations may be provided before changing to program point 320.
  • the power can also be estimated or measured by other means than by measuring the absorbed current.
  • the first area is used to detect the presence of a load when the automatic release function is present.
  • the averaged value at program point 250 can also be multiplied by a factor of 0.5 or 0.8.
  • the third area is provided to detect the presence of a loosened screw element.
  • the fourth area is provided in order to carry out a further loosening of the screw after the detection of a loosened screw, without preferably loosening the screw completely from the counterpart, in particular a screw bolt.
  • the screw element can be designed as a screw, bolt or in another form.

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)

Claims (15)

  1. Procédé permettant de faire fonctionner un outil électrique comprenant un moteur électrique pour desserrer un élément fileté d'une pièce complémentaire, dans lequel l'outil électrique est en liaison fonctionnelle avec l'élément fileté à l'aide d'un élément rotatif,
    caractérisé en ce que, dans une première étape, il est vérifié si une puissance du moteur électrique dépasse une première limite de puissance prédéfinie pendant une première durée minimale prédéfinie,
    dans lequel, après le dépassement de la première limite de puissance pendant la première durée minimale, on passe à une deuxième étape,
    dans lequel, dans la deuxième étape, une variation temporelle de la puissance est détectée pendant une deuxième durée prédéfinie,
    dans lequel on passe à une troisième étape lorsque la puissance pendant la deuxième durée est supérieure à une deuxième limite de puissance et qu'une fluctuation dans le temps de la puissance se situe en deçà d'une valeur de fluctuation prédéterminée,
    dans lequel une troisième limite de puissance est déterminée en fonction de la puissance détectée dans la deuxième étape,
    dans lequel on passe de la troisième étape à une quatrième étape lorsque la puissance s'abaisse en dessous de la troisième limite de puissance pendant une troisième durée prédéfinie,
    dans lequel, dans la quatrième étape, la puissance du moteur électrique est réduite d'au moins 30 %.
  2. Procédé selon la revendication 1, dans lequel, dans la deuxième étape, on effectue au moins deux, en particulier cinq mesures de la puissance prélevée par le moteur électrique, dans lequel on passe à la troisième étape lorsque la puissance mesurée se situe en deçà de la valeur de fluctuation.
  3. Procédé selon la revendication 2, dans lequel les mesures de la puissance sont respectivement effectuées pendant une durée prédéfinie, en particulier pendant au moins 8 millisecondes, dans lequel on calcule la moyenne des puissances mesurées, dans lequel on passe à la troisième étape lorsque la puissance moyenne se situe en deçà de la valeur de fluctuation prédéfinie.
  4. Procédé selon la revendication 2 ou 3, dans lequel la puissance est mesurée sur la base d'une intensité de courant qui est prélevée par le moteur électrique.
  5. Procédé selon l'une des revendications précédentes, dans lequel la troisième limite de puissance est déterminée à partir d'une somme moyennée des puissances mesurées dans la deuxième étape et multipliée par un facteur inférieur à 1.
  6. Procédé selon l'une des revendications précédentes, dans lequel une valeur prédéfinie est attribuée à la troisième limite de puissance lorsque les conditions de la deuxième étape ne sont pas remplies au-cours d'une durée prédéfinie, et dans lequel on passe ensuite à la troisième étape.
  7. Procédé selon l'une des revendications précédentes, dans lequel, dans la quatrième étape et après un nombre prédéterminé de tours de l'élément rotatif, la puissance est encore réduite d'au moins 50%.
  8. Procédé selon l'une des revendications précédentes, dans lequel, dans la quatrième étape, une rotation de l'élément rotatif est freinée, en particulier arrêtée, après qu'un nombre prédéterminé de tours a été atteint.
  9. Procédé selon l'une des revendications précédentes, dans lequel la puissance du moteur électrique est réduite, en particulier le moteur électrique est désactivé, lorsqu'il est déterminé dans la deuxième étape que la puissance prélevée par le moteur électrique est inférieure à la deuxième limite de puissance.
  10. Procédé selon l'une des revendications précédentes, dans lequel la première limite de puissance est supérieure à la deuxième limite de puissance.
  11. Appareil de commande (14) qui est conçu pour mettre en œuvre un procédé selon les revendications précédentes.
  12. Outil électrique (1) comprenant un moteur électrique (16) pour faire tourner un élément rotatif (2), une alimentation électrique (3), un commutateur (13) permettant de sélectionner une fonction de desserrage automatique pour desserrer un élément fileté d'une pièce complémentaire conformément à un procédé selon l'une des revendications 1 à 10.
  13. Outil électrique selon la revendication 12, dans lequel il est prévu un affichage (8), dans lequel l'affichage (8) est conçu pour indiquer une fonction de desserrage automatique activée.
  14. Outil électrique selon la revendication 13, dans lequel l'affichage (8) est disposé dans une partie inférieure d'une poignée (4) de l'outil électrique (1).
  15. Outil électrique selon la revendication 13 ou 14, dans lequel l'affichage (8) est conçu pour indiquer au moins deux vitesses de rotation de l'élément rotatif (2), dans lequel le commutateur (13) et l'affichage (8) sont notamment disposés l'un à côté de l'autre.
EP16809312.8A 2015-12-21 2016-11-30 Procédé permettant de faire fonctionner un outil électrique Active EP3393710B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015226374.6A DE102015226374A1 (de) 2015-12-21 2015-12-21 Verfahren zum Betreiben eines Elektrowerkzeuges
PCT/EP2016/079198 WO2017108352A1 (fr) 2015-12-21 2016-11-30 Procédé permettant de faire fonctionner un outil électrique

Publications (2)

Publication Number Publication Date
EP3393710A1 EP3393710A1 (fr) 2018-10-31
EP3393710B1 true EP3393710B1 (fr) 2020-03-25

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EP16809312.8A Active EP3393710B1 (fr) 2015-12-21 2016-11-30 Procédé permettant de faire fonctionner un outil électrique

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US (1) US10894307B2 (fr)
EP (1) EP3393710B1 (fr)
JP (1) JP6556363B2 (fr)
CN (1) CN108698214B (fr)
DE (1) DE102015226374A1 (fr)
WO (1) WO2017108352A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7287671B2 (ja) * 2019-08-28 2023-06-06 京都機械工具株式会社 工具システム及び工具システム用プログラム

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Publication number Priority date Publication date Assignee Title
JPH1080828A (ja) * 1996-09-06 1998-03-31 Toyota Motor Corp ナットランナの制御方法

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DE19620782A1 (de) * 1995-06-03 1996-12-05 Volkswagen Ag Verfahren zur Herstellung einer Schraubverbindung und Vorrichtung hierfür
JP2001212771A (ja) * 2000-02-01 2001-08-07 Yutani:Kk 締付工具のコントローラ
JP3886818B2 (ja) 2002-02-07 2007-02-28 株式会社マキタ 締付工具
DE102009002858A1 (de) 2009-05-06 2010-11-18 Robert Bosch Gmbh Elektrowerkzeugmaschine und Verfahren zum Betreiben einer Elektrowerkzeugmaschine
US20130327552A1 (en) * 2012-06-08 2013-12-12 Black & Decker Inc. Power tool having multiple operating modes
WO2014144353A1 (fr) 2013-03-15 2014-09-18 Milwaukee Electric Tool Corporation Enregistrement et lecture d'opération d'outil électrique
EP2979817B1 (fr) * 2013-03-30 2022-05-04 Koki Holdings Co., Ltd. Outil à moteur
JP6107385B2 (ja) * 2013-04-26 2017-04-05 日立工機株式会社 電動工具
US9762153B2 (en) * 2013-10-18 2017-09-12 Black & Decker Inc. Cycle-by-cycle current limit for power tools having a brushless motor
DE102015211119A1 (de) * 2014-06-20 2015-12-24 Robert Bosch Gmbh Verfahren zum Steuern eines Elektromotors eines Elektrowerkzeuges

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JPH1080828A (ja) * 1996-09-06 1998-03-31 Toyota Motor Corp ナットランナの制御方法

Also Published As

Publication number Publication date
WO2017108352A1 (fr) 2017-06-29
US20180370000A1 (en) 2018-12-27
EP3393710A1 (fr) 2018-10-31
DE102015226374A1 (de) 2017-06-22
US10894307B2 (en) 2021-01-19
JP2019503876A (ja) 2019-02-14
JP6556363B2 (ja) 2019-08-07
CN108698214B (zh) 2021-07-13
CN108698214A (zh) 2018-10-23

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