EP2505316A2 - Procédé de commande et machine-outil manuelle - Google Patents

Procédé de commande et machine-outil manuelle Download PDF

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Publication number
EP2505316A2
EP2505316A2 EP12155291A EP12155291A EP2505316A2 EP 2505316 A2 EP2505316 A2 EP 2505316A2 EP 12155291 A EP12155291 A EP 12155291A EP 12155291 A EP12155291 A EP 12155291A EP 2505316 A2 EP2505316 A2 EP 2505316A2
Authority
EP
European Patent Office
Prior art keywords
battery pack
motor
rate
tool
control method
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.)
Withdrawn
Application number
EP12155291A
Other languages
German (de)
English (en)
Other versions
EP2505316A3 (fr
Inventor
Thomas Müller
Benno Verhaag
Jens Imaschewski
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP2505316A2 publication Critical patent/EP2505316A2/fr
Publication of EP2505316A3 publication Critical patent/EP2505316A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for

Definitions

  • the present invention relates to a control method for a battery-operated hand tool and a battery-powered hand tool, in particular an electric hand tool, such as an electric screwdriver.
  • the hand tool of the invention has a tool holder for receiving a tool.
  • a motor is coupled to the tool holder for driving the tool holder.
  • the motor is arranged in a housing.
  • the housing has a holder which is provided with a mechanical latch for releasably coupling a battery pack and a power connector for electrically connecting the battery pack to the motor.
  • a communication interface is used to transmit properties of the battery pack to a motor controller.
  • the engine controller includes a soft start that accelerates a speed of the engine from a standstill to a desired speed at a rate, the engine controller controlling the rate in response to a characteristic of the battery pack conveyed by the battery pack.
  • the control method according to the invention comprises the following steps: interrogating properties of the battery pack coupled to the portable power tool, setting a rate for accelerating the motor depending on the transmitted properties of the battery pack and accelerating the motor at the set rate when the key is actuated.
  • the transmitted property of the battery pack is in particular a measure of an internal resistance of the battery pack.
  • the rate may be set to a first value when the internal resistance falls below a threshold value and set to a second value when the internal resistance exceeds the threshold value. The second value is greater than the first value.
  • the engine controller accelerates the engine to a desired speed in a shorter amount of time when a transmitted internal resistance is less than the threshold. Otherwise, the engine will slow down and correspondingly Accelerated over a longer period of time to the target speed.
  • the measure of the internal resistance may be, for example, the presence of a parallel connection or a series connection and / or a type of the battery cells of the battery pack.
  • a battery pack for the handheld power tool may include a data memory in which an internal resistance of the battery pack is stored.
  • the internal resistance is for a selected temperature, e.g. at room temperature, determined.
  • a development of the hand tool or the control method uses a temperature sensor to measure the temperature of the environment or the battery pack. The measured temperature is used to compensate for temperature dependencies of the internal resistance of the battery pack.
  • the hand tool machine may adjust the rate for accelerating the motor as a function of the temperature. In particular, the rate is reduced when a temperature below freezing is measured.
  • the handheld power tool monitors a voltage applied to the power connection during the acceleration of the motor, and the rate is reduced when the applied voltage falls below a first threshold value.
  • a current consumption from the battery pack can be interrupted if a voltage lying on the power supply falls below a second threshold, which is lower than the one threshold value.
  • the battery pack may include a self-contained protection mechanism that prevents overloading the battery pack.
  • the protection mechanism monitors, for example, a voltage of each individual battery cell. Once the voltage of one of the battery cells is below the second threshold of e.g. 2.5 V falls, the battery pack is disconnected from the hand tool immediately.
  • the short-term high current consumption when accelerating the motor could cause a break-in or the second threshold.
  • the engine controller anticipates reducing the rate of acceleration to prevent complete engine shutdown.
  • the acceleration of the motor is adjusted by a pulse width modulation.
  • a duty cycle of the pulse width modulation determined by the dependencies of the set rate.
  • Fig. 1 shows an electric screwdriver 1 as an example of a hand tool.
  • the electric screwdriver 1 has a housing 2 with a handle 3, by means of which a user can hold and guide the electric screwdriver 1 .
  • a button 4 on the handle 3 allows the user to increase the electric screwdriver 1 in operation. Typically, the user must keep the button 4 pressed continuously to keep the electric screwdriver 1 in operation.
  • the electric screwdriver 1 has a tool holder 5, in which the user can use a screwdriver bit 6 .
  • an electric motor 7 rotates the tool holder 5 about its axis 8.
  • the electric motor 7 is coupled via a spindle 9 and possibly other components of a drive train, such as clutch, gear, with the tool holder 5 .
  • the battery pack 10 has a plurality of secondary battery cells 11, which, for example, lithium-based chemistry, have.
  • the housing 2 has a holder 12 for the battery pack 10, which is provided by way of example at one end of the handle 3 .
  • the bracket 12 may have rails with an L-shaped profile into which complementary rails on the battery pack 10 are slidably inserted.
  • a detachable lock 13 prevents falling out of the battery pack 10 from the holder 12.
  • a power connector 14 of the power tool 1 is arranged in the holder 12 .
  • the power connector 14 includes, for example, two or more electrical contacts 15.
  • the battery pack 10 has to the power connector 14 of the power tool 1 complementary contacts 16 which are electrically contacted at a battery pack 10 inserted into the holder 12 .
  • the battery pack 10 may have a self-sufficient protection mechanism 17 .
  • the protection mechanism 17 includes, for example, a voltage sensor 18 which monitors the voltages of the individual battery cells 11 . If the protective mechanism 17 detects a drop in a voltage of one of the battery cells 11 below a critical threshold value, a current output of the battery pack 10 is interrupted.
  • the critical threshold is chosen such that an irreversible discharge of the battery cells 11 is prevented.
  • the threshold is for example for Li-ion chemistry based battery cells 11 at about 2.5 V, in particular at room temperature.
  • the battery pack 10 can interrupt a current path 20 between the battery pack 10 and the electric motor 7 by means of a switch 19, for example a FET in the battery pack 10 or in the handheld power tool 1 .
  • the reversible protection mechanism 17 and the associated switch 19 are self-sufficient from other systems. This is particularly the case with an arrangement of the switch 19 in the battery pack 10 of the case when any supply of the power tool 1 is interrupted by the battery pack 10 .
  • the hand tool 1 can be operated at a controlled speed.
  • the speed can be set by a user adjustable or unchangeable for the power tool 1 .
  • a motor controller 21 with one or more switching elements 22 sets a power consumption of the power tool 1 in order to adjust the speed to the desired value.
  • An embodiment of a handheld power tool 1 does not provide a regulated speed, but the speed is limited by a maximum power consumption of the electric motor 7 , for example by the nominal power of the electric motor 7 or a nominal maximum power output of the battery pack 10.
  • the motor controller 21 includes a module for a soft start 23.
  • the soft start 23 is activated by pressing the button 4 .
  • the soft start 23 limits an average power consumption of the electric motor 7.
  • a switching element in the current path to the electric motor 7 can be controlled by means of a pulse width modulation.
  • a duty cycle of the pulse width modulation is determined by the soft start 23 according to a desired average power consumption.
  • the soft start 23 determines the duration over which the electric motor 7 is accelerated to the target speed.
  • the otherwise by the torque applied by the electric motor 7 and the applied load adjusting acceleration value (acceleration rate) is limited by the soft start 23 to a set rate.
  • the soft start 23 is deactivated and, if necessary, the speed on the Target speed corrected.
  • the soft start 23 can be terminated after a defined period of time.
  • the engine controller 21 communicates with the battery pack 10 to determine its characteristics.
  • a communication interface 24 of the motor control 21 inter alia interrogates an internal resistance of the battery pack 10 .
  • the battery pack 10 has, for example, an information memory in which the internal resistance of the battery pack 10 is stored.
  • the internal resistance can be stored in ohms or another unit of measurement. Alternatively, the internal resistance can be implicitly stored by specifying whether battery cells are connected in parallel and if so how many parallel rows of battery cells 11 are present.
  • the battery pack 10 may also communicate a type of the battery cells 11 used to which the soft start 23 adjusts the rate as appropriate.
  • the communication interface 24 is preferably an electrical communication interface whose receiving unit receives information units transmitted from the battery pack 10 as electrical signals from a memory component 26 .
  • the communication interface 24 may include a detector which determines passively provided information units from the battery pack 10 .
  • the information units in the form of a barcode, a mechanical coding, etc. may be provided on the battery pack 10 .
  • the motor controller 21 adjusts the soft start 23 as a function of the internal resistance transmitted by the battery pack 10.
  • the motor controller 21 can compare the transmitted internal resistance with a threshold value. If the internal resistance exceeds a threshold, a lower rate for the acceleration is applied. The lower rate can also be set when the battery pack 10 transmits a pure series connection of the battery cells 11 .
  • a duty cycle of the pulse width modulation can initially be set in a range between 40% and 60% and continuously increased by the soft start 23 to 100%. The rate determines the duration over which the duty cycle increases to 100%. If a low internal resistance or a parallel connection of the battery cells 11 is transmitted, the motor 7 can be greatly accelerated. The duty cycle can grow at a high rate and thus in a short time to 100%.
  • an initial value for the duty cycle can be set to a value between 60% and 75%.
  • the electric motor 7 may be at a high rate for the second case within 0.6 seconds, eg, twice the low rate, ie, accelerate the electric motor 7 to target speed within 0.3 seconds.
  • a further development provides a temperature sensor 25 , which detects the temperature of the battery pack 10 . If the temperature falls below a threshold, the rate of acceleration is reduced. For example, the rate may be decreased by 10% for every 5 degrees, the temperature being less than 10 centigrade. Likewise, for example, a start value for the duty cycle can be lowered to 20%, for example, if the temperature is below freezing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Control Of Electric Motors In General (AREA)
EP12155291.3A 2011-03-30 2012-02-14 Procédé de commande et machine-outil manuelle Withdrawn EP2505316A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011006385 2011-03-30

Publications (2)

Publication Number Publication Date
EP2505316A2 true EP2505316A2 (fr) 2012-10-03
EP2505316A3 EP2505316A3 (fr) 2014-04-23

Family

ID=45592247

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12155291.3A Withdrawn EP2505316A3 (fr) 2011-03-30 2012-02-14 Procédé de commande et machine-outil manuelle

Country Status (3)

Country Link
US (1) US20120247796A1 (fr)
EP (1) EP2505316A3 (fr)
CN (1) CN102729220A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
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EP2944431A1 (fr) * 2014-05-13 2015-11-18 Vorwerk & Co. Interholding GmbH Procédé d'échange de données entre une pluralité d'outils électriques et un accumulateur
EP2995428A1 (fr) * 2014-09-12 2016-03-16 Panasonic Intellectual Property Management Co., Ltd. Outil électrique
US11569765B2 (en) 2019-10-11 2023-01-31 Black & Decker Inc. Power tool receiving different capacity battery packs

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JP5938652B2 (ja) * 2012-05-10 2016-06-22 パナソニックＩｐマネジメント株式会社 電動工具
DE102012223011A1 (de) * 2012-12-13 2014-06-18 Hilti Aktiengesellschaft Verfahren zum Betreiben eines handgeführten Arbeitsgeräts
DE102013212635B4 (de) * 2013-06-28 2024-05-08 Robert Bosch Gmbh Handwerkzeugmaschine
EP2873491A1 (fr) * 2013-11-15 2015-05-20 HILTI Aktiengesellschaft Correction de tension à basse température pour prévenir les interruptions d'alimentation dues aux sous-tensions pour outillage électroportatif alimenté par batterie
EP3010080B1 (fr) * 2014-10-15 2022-02-23 Ethicon Endo-Surgery, Inc. Bloc-batterie d'instrument chirurgical avec sondage de tension
US9833239B2 (en) * 2014-10-15 2017-12-05 Ethicon Llc Surgical instrument battery pack with power profile emulation
US10342401B2 (en) 2014-11-26 2019-07-09 Techtronic Industries Co. Ltd. Battery pack
WO2016100884A1 (fr) 2014-12-18 2016-06-23 Black & Decker Inc. Schéma de commande pour prolonger l'utilisation d'un outil à mesure que la batterie se décharge
EP3068010A1 (fr) * 2015-03-10 2016-09-14 HILTI Aktiengesellschaft Chargeur de batterie pouvant fonctionner en réseau et système de recharge
EP3370924B1 (fr) 2015-11-02 2021-05-05 Black & Decker Inc. Réduction du bruit et abaissement des harmoniques dans des machines-outils à l'aide de modes de commande de bande de conduction
JP6641919B2 (ja) * 2015-11-20 2020-02-05 マックス株式会社 工具
DE102015226090A1 (de) 2015-12-18 2017-06-22 Robert Bosch Gmbh Handwerkzeugmaschine mit einem Schlagwerk
DE102015226410A1 (de) * 2015-12-22 2017-06-22 Robert Bosch Gmbh Handwerkzeugmaschine
CN105538242A (zh) * 2015-12-31 2016-05-04 宁波中旺工具有限公司 一种电动螺丝刀
CN106926179B (zh) * 2015-12-31 2019-09-20 南京德朔实业有限公司 电动工具
KR102251270B1 (ko) 2016-01-05 2021-05-11 밀워키 일렉트릭 툴 코포레이션 전동 공구를 위한 진동 감소 시스템 및 그 방법
AU2017213819B2 (en) 2016-02-03 2019-12-05 Milwaukee Electric Tool Corporation Systems and methods for configuring a reciprocating saw
TWI734749B (zh) 2016-02-25 2021-08-01 美商米沃奇電子工具公司 包括輸出位置感測器之動力工具
EP3296063B1 (fr) * 2016-06-24 2020-03-25 Black & Decker Inc. Système de commande pour outil électrique doté d'un moteur sans balai
US11285588B2 (en) * 2017-12-11 2022-03-29 Atlas Copco Industrial Technique Ab Electric pulse tool
DE102017222550A1 (de) * 2017-12-13 2019-06-13 Robert Bosch Gmbh Zusatzmodul zur Verwendung mit einem Arbeitsgerät und Arbeitsgerät
US10835972B2 (en) 2018-03-16 2020-11-17 Milwaukee Electric Tool Corporation Blade clamp for power tool
EP3774148A4 (fr) 2018-04-03 2021-12-15 Milwaukee Electric Tool Corporation Scie sauteuse
USD887806S1 (en) 2018-04-03 2020-06-23 Milwaukee Electric Tool Corporation Jigsaw
JP7176328B2 (ja) * 2018-09-28 2022-11-22 工機ホールディングス株式会社 電動作業機
JP7341817B2 (ja) * 2019-09-20 2023-09-11 株式会社マキタ 電動作業機

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2944431A1 (fr) * 2014-05-13 2015-11-18 Vorwerk & Co. Interholding GmbH Procédé d'échange de données entre une pluralité d'outils électriques et un accumulateur
EP2995428A1 (fr) * 2014-09-12 2016-03-16 Panasonic Intellectual Property Management Co., Ltd. Outil électrique
US9553534B2 (en) 2014-09-12 2017-01-24 Panasonic Intellectual Property Management Co., Ltd. Electric power tool
US11569765B2 (en) 2019-10-11 2023-01-31 Black & Decker Inc. Power tool receiving different capacity battery packs

Also Published As

Publication number Publication date
CN102729220A (zh) 2012-10-17
EP2505316A3 (fr) 2014-04-23
US20120247796A1 (en) 2012-10-04

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