Hand-held power tool

Abstract

A power tool includes a housing in which a drive unit is arranged, and a tool holder for the detachable holding of a tool insert. The tool insert is configured to be driven percussively and/or rotationally. A sensor unit is configured to detect at least one movement variable, and electronics are configured to control or regulate the power tool. The electronics have a percussion detection unit configured to determine a percussion mode based on at least one movement variable and/or a rotation detection unit configured to determine a rotation of the housing. The electronics control the drive unit based on the determined percussion mode and/or the determined rotation of the housing. The electronics have at least two parameter sets for the percussion detection unit and/or at least two parameter sets for the rotation detection unit. The electronics are configured to select one of the at least two parameter sets.

Claims

1. A hand-held power tool comprising: a drive unit; a housing in which the drive unit is mounted; a tool receiver configured to detachably receive an insert tool, the insert tool configured to be driven at least one of percussively and rotationally by the drive unit; a sensor unit configured to sense at least one motion variable; and an electronics system configured to: control at least the drive unit by open-loop or closed-loop control; automatically select a parameter set from at least two parameter sets; determine a percussion mode of the hand-held power tool using the selected parameter set from the at least two parameter sets and based on the at least one motion variable; and control the drive unit based on the determined percussion mode of the hand-held power tool, wherein the at least two parameter sets are configured such that determination of the percussion mode by use of a first parameter set from the at least two parameter sets differs from determination of the percussion mode by use of a second parameter set from the at least two parameter sets.

2. The hand-held power tool as claimed in claim 1, wherein a first parameter set and a second parameter from the at least two parameter sets set differ at least in a threshold.

3. The hand-held power tool as claimed in claim 1, wherein the at least two parameter sets are configured such that control of the drive unit based on the determined percussion mode by use of a first parameter set from the at least two parameter sets differs from control of the drive unit based on the determined percussion mode by use of a second parameter set from the at least two parameter sets.

4. The hand-held power tool as claimed in claim 1, wherein a first parameter set and a second parameter set from the at least two parameter sets differ at least in a percussion frequency.

5. The hand-held power tool as claimed in claim 1, further comprising: an operating switch configured to manually control the drive unit; and an operating-switch position unit operably connected to the operating switch and configured to determine a position of the operating switch and to provide the determined position to the electronics system.

6. The hand-held power tool as claimed in claim 5, further comprising: a battery pack, wherein a battery-pack operating parameter is configured to be provided to the electronics system.

7. The hand-held power tool as claimed in claim 6, wherein the electronics system is configured to select the selected parameter set from the at least two parameter sets based on at least one of the operating switch position, an instantaneous rotational speed of an electric motor of the drive unit, a weight parameter, and the battery-pack operating parameter.

8. A hand-held power tool comprising: a drive unit; a housing in which the drive unit is mounted; a tool receiver configured to detachably receive an insert tool, the insert tool configured to be driven at least one of percussively and rotationally by the drive unit; a sensor unit configured to sense at least one motion variable; and an electronics system configured to: control at least the drive unit by open-loop or closed-loop control; automatically select a parameter set from at least two parameter sets; determine a percussion mode of the hand-held power tool using the selected parameter set from the at least two parameter sets and based on the at least one motion variable; and control the drive unit based on the determined percussion mode of the hand-held power tool, wherein the at least two parameter sets are configured such that control of the drive unit based on the determined percussion mode by use of a first parameter set from the at least two parameter sets differs from control of the drive unit based on the determined percussion mode by use of a second parameter set from the at least two parameter sets.

9. A hand-held power tool comprising: a drive unit; a housing in which the drive unit is mounted; a tool receiver configured to detachably receive an insert tool, the insert tool configured to be driven at least one of percussively and rotationally by the drive unit; a sensor unit configured to sense at least one motion variable; and an electronics system configured to: control at least the drive unit by open-loop or closed-loop control; automatically select a parameter set from at least two parameter sets; determine a percussion mode of the hand-held power tool using the selected parameter set from the at least two parameter sets and based on the at least one motion variable; and control the drive unit based on the determined percussion mode of the hand-held power tool, wherein a first parameter set and a second parameter set from the at least two parameter sets differ at least in a percussion frequency.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages are given by the following description of the drawings. The drawings, the description and the claims contain numerous features in combination. Persons skilled in the art will expediently also consider the features individually and combine them to form further appropriate combinations. References of features of different embodiments of the disclosure that substantially correspond are denoted by the same number and by a letter indicating the embodiment.

(2) There are shown:

(3) FIG. 1 a side view of a hand-held power tool;

(4) FIG. 2 a perspective view of an electronics system of the hand-held power tool;

(5) FIG. 3a a perspective view of an operating-mode switching device;

(6) FIG. 3b a bottom view of an operating element of the operating-mode switching device;

(7) FIG. 4 a longitudinal section through the operating-mode switching device;

(8) FIG. 5 a top view of the operating-mode switching device in chiseling operation;

(9) FIG. 6 a schematic illustration of a signal generator element with a diagram representing the magnetic flux density;

(10) FIG. 7 a top view of the operating-mode switching device in anti-clockwise hammer-drilling mode;

(11) FIG. 8 a flow diagram for a control procedure based on the determined switching position;

(12) FIG. 9 an alternative embodiment of the operating-mode switching device;

(13) FIG. 10 a flow diagram of a procedure for selecting a parameter set for a percussion detection unit;

(14) FIG. 11a a flow diagram of a procedure for selecting a parameter set for a rotation detection unit;

(15) FIG. 11b a flow diagram of a further procedure for selecting a parameter set for a rotation detection unit;

(16) FIG. 12 a flow diagram of a procedure for selecting a parameter set for a percussion detection unit and a rotation detection unit;

(17) FIG. 13 a flow diagram of a further procedure for selecting a parameter set for a percussion detection unit;

(18) FIG. 14 a flow diagram for automatically controlling the drive unit by means of the percussion detection unit;

(19) FIG. 15 an example of a frequency spectrum of a motion variable;

(20) FIG. 16 an example of a threshold value procedure.

DETAILED DESCRIPTION

(21) FIG. 1 shows a side view of a hand-held power tool 10 having an operating-mode switching device 100 according to the disclosure. The hand-held power tool 10 is realized, for example, as a hammer drill. The hand-held power tool 10 has a housing 12 that comprises an outer housing 14 and an inner housing 16. Arranged in the housing 12 of the hand-held power tool 10 there is a drive unit 20, which comprises an electric motor 18 and transmits a drive motion to a transmission unit 22 that has a percussion mechanism 24. The percussion mechanism 24 is realized, for example, as a pneumatic percussion mechanism, and has an eccentric unit, not represented.

(22) The inner housing 16 has a motor housing 19 and a transmission housing 23, which are at least partially, in particular entirely, enclosed by the outer housing 14. The percussion mechanism 24, in particular the transmission unit 22, is accommodated substantially entirely in the transmission housing 23. The transmission housing 23 encompasses a grease chamber, in which a lubricant for lubricating the gear unit 22 is at least partially arranged. The motor housing 19 is designed, in particular, for receiving and/or mounting the electric motor 18. The motor housing 19 is connected, for example via a screwed connection, to the transmission housing 23. Exemplarily, the transmission housing is made of a material different from that of the motor housing 19. Exemplarily, the transmission housing 23 is made of a metallic material, while the motor housing 19 and the outer housing 14 are made of a plastic. In particular, the transmission housing 23 has a higher strength than the motor housing 19 and/or the outer housing 14.

(23) Via the transmission unit 22 the drive motion of the drive unit 20 is transmitted to a tool receiver 26, in which an insert tool 28 is fastened in a detachable manner. The tool receiver 26 is realized, in particular, as a drill chuck. The insert tool 28 is realized, exemplarily, so that it can be driven rotationally about, and/or in a linearly oscillating, or percussive, manner along, a work axis 29. In addition, the insert tool 28 can be driven clockwise or anti-clockwise. The work axis extends, for example, transversely, in particular substantially perpendicularly, in relation to a motor axis of the drive unit 20.

(24) The hand-held power tool 10 has a handle 30. The handle 30 is arranged on a side of the housing 12 that faces away from the tool receiver 26. The handle 30 has an operating switch 32, via which the hand-held power tool 10 can be controlled manually, or switched on and off. The handle 30 is realized, exemplarily, as a vibration-decoupled handle 30. The handle 30 is connected to the housing 12 so as to be movable relative to the latter. Also arranged on the handle 30 is a locking switch 33, which is designed to lock the hand-held power tool 10, in particular in a chiseling operation. Furthermore, the hand-held power tool 10 has an ancillary handle 34, which is detachably connected to the housing 12. The hand-held power tool 10 is realized, exemplary, as a battery-powered hand-held power tool. Exemplarily, the hand-held power tool 10 has a battery interface 36, via which a battery pack 38 is detachably connected to the hand-held power tool 10, in particular to the handle 30.

(25) The hand-held power tool 10 has an electronics system 40, which is designed to control the hand-held power tool 10, in particular the drive unit 20 of the hand-held power tool 10, by open-loop or closed-loop control. The electronics system 40 is arranged beneath the electric motor 18, in particular beneath the motor housing 19. The transmission unit 22, in particular the transmission housing 23, is arranged above the electric motor 18. FIG. 2 shows a perspective view of the electronics system 40. The electronics system 40 is arranged in an electronics housing 42 that is composed, exemplarily, of a lower housing part 44 and of an upper housing part, which is not represented. The electronics housing 42 is designed, in particular, to protect the electronics system 40 against the ingress of dust and/or moisture. The electronics housing 42 is enclosed substantially entirely by the outer housing 14, and connected to it. The electronics system 40 has a printed circuit board 48, on which a computing unit 50 and a storage unit 52 are arranged. Also arranged on the printed circuit board 48 of the electronics system 40 are sockets 54 that can be connected to plug-in connectors, not represented. The sockets 54 are arranged in such a manner that they can be connected to the plug-in connectors even when the electronics housing 42 is closed.

(26) The hand-held power tool 10 additionally has a user interface 56. The user interface 56 comprises a display element, not represented in greater detail, and an interface operating element for operating the user interface 56. The display element can be used to display, for example, a state of charge of the battery pack 38 connected to the hand-held power tool 10, temperature information relating to the hand-held power tool 10 and/or the battery pack 38, a selected type of operation and/or a selected operating mode, etc. The user interface 56 is arranged on a side of the housing 12 that faces away from the tool receiver 26 and towards the handle 30.

(27) The hand-held power tool 10 comprises a communication interface 58 for sending and/or receiving information, in particular wirelessly, to or from an external device. The external device may be realized, for example, as a computing network, as a smartphone, as a preferably portable computer, or the like. The communication interface 58 has a communication module that is detachably connected to the hand-held power tool 10. The communication module has a communication element, not represented in greater detail, designed to transmit data via Bluetooth. Alternatively, it would also be conceivable for the communication element to be designed to transmit data via another industry standard, such as WLAN or a mobile wireless network. Preferably, the communication interface 58, in particular the wireless module, has a damping element, for example in the form of an elastic sealing ring. The damping element enables the wireless module to be protected in an effective manner from the vibrations that occur during operation of the hand-held power tool. The communication interface 58 is arranged between the electronics system 40 and the transmission unit 22, in particular adjacent to the drive unit 20.

(28) The operating-mode switching device 100, the user interface 56 and the communication interface 58 are electrically connected to the electronics system 40. The electrical connection is effected, for example, via data cables that are connected to the sockets 54 of the electronics system 40 by means of a plug-in connection.

(29) The operating-mode switching device 100 is arranged, for example, on an upper side of the hand-held power tool 10. Alternatively, other arrangements are conceivable, such as, for example, on the side of the housing 12 of the hand-held power tool 10, in particular adjacent to the transmission unit 22. The operating-mode switching device 100 has an operating element 102 realized, for example, as a rotary knob. The operating element 102 is mounted so as to be rotatable about an operating axis 104. The operating element 102 has a grip region 106 that protrudes outward in such a manner that the operating element 102 can be gripped on the side, on the grip region 106. The operating element 102 has a marking 108 that indicates the currently selected switching position, or operating mode, to the user of the hand-held power tool 10.

(30) The operating element 102 has, for example, four different switching positions. The operating element is preferably realized in such a manner that the operating element 102 latches into the switching positions. The four switching positions are marked on the housing 12 of the hand-held power tool 10, for example by the numbers 1 to 4, with 1 corresponding to the switching position for chiseling operation, 2 to the switching position for vario-lock, 3 to the switching position for clockwise hammer-drilling operation, and 4 to the switching position for anti-clockwise hammer-drilling operation. The chiseling operation, or switching position 1, corresponds to an operating mode in which the insert tool 28 is designed to be driven exclusively in a linearly oscillating manner. The vario-lock, or switching position 2, corresponds to an operating mode in which the tool receiver 26 is prepared, or can be aligned, for chiseling operation. The clockwise hammer-drilling mode, or switching position 3, corresponds to an operating mode in which the insert tool 28 is driven clockwise in a rotating an linearly oscillating manner. The anti-clockwise hammer-drilling mode, or switching position 4, corresponds to an operating mode in which the insert tool 28 is driven anti-clockwise in a rotating an linearly oscillating manner. The operating element 102 is designed to be rotatable by 180° in order to switch between the first and the last switching position. The rotary capability of the operating element 102 is preferably delimited by stop elements, not represented in greater detail.

(31) Furthermore, the operating-mode switching device 100 has a position determining unit 110 for providing at least one item of switching position information to the electronics system 40. The position determining unit 110 has, for example, two signal generator elements 112, and two sensor elements 114, 115 for sensing a signal of the signal generator elements 112. The signal generator elements 112 are mechanically connected to the operating element 102. In particular, the operating element 102, on its inside, preferably on the inside of the grip region 106, has receiving pockets 116, in which the signal generator elements 112 are received in a non-positive and positive manner. The signal generator elements 112 are realized, for example, as permanent magnets, and each have a north pole 120 and a south pole 122. The signal generator elements 112 are substantially identical in design, and are of the same size and of substantially identical magnetization. The signal generator elements 112 have a substantially cylindrical basic shape. Preferably, the north pole 120 differs in shape from the south pole 122 of the signal generator element 112, thereby enabling the signal generator elements 112 to be correctly mounted in the receiving pockets 116 of the operating element 102 that match the contour. For example, the north pole 120 has a conical sub-region, while the south pole 122 is cylindrical throughout.

(32) The two signal generator elements 112 are arranged in mirror symmetry in relation to the operating axis 104 of the operating element 102. Advantageously, it can thus be ensured that, irrespective of the selected switching position, the signal generator elements 112 can never assume the same position and orientation.

(33) FIG. 4 shows a longitudinal section through the operating-mode switching device 100, along the plane A indicated in FIG. 3a. The plane A intersects the marking 108 of the operating element 102, under which one of the signal generator elements 112 is arranged. The signal generator element 112 is arranged in one of the receiving pockets 116 of the operating element 102, on an inner side that aces toward the inside of the housing 12 of the hand-held power tool 10. The signal generator element 112 has a round cross-section. The position determining unit 110 has a printed circuit board 124 on which the two sensor elements 114, 115 are arranged. The representation shows the first sensor elements 114, which is arranged beneath the signal generator element 112. The sensor elements 114, 115, in at least one switching position, are arranged adjacent to the signal generator elements 112, in order to sense a sufficiently strong signal. The sensor elements 114, 115 are in particular arranged between the transmission unit 22 and the operating element 102, preferably between the transmission housing 23 and the outer housing 14. As a result of the sensor elements 114, 115 being arranged outside of the transmission housing 23, they can be protected in an effective manner against abrasive particles and the lubricant. To further protect the sensor elements 114, 115, the operating-mode switching device 100 has a protective element 126 that covers the printed circuit board 124, at least one the side on which the sensor elements 114, 115 are arranged. The protective element 126 is realized, for example, as a potting compound. The protective element 126 realized as a potting compound is arranged, in particular, between the signal generator element 112 and the sensor elements 114, 115.

(34) FIG. 5 shows a top view of the operating-mode switching device 100, with the operating element 102 concealed and the protective element 126 shown in a transparent manner. As before, the operating element 102 is switched in a first switching position, which corresponds to a chiseling operation. The printed circuit board 124 of the position determining unit 110 has a rectangular shape, and is arranged entirely on a side of the operating-mode switching device 100 that faces away from the tool receiver 26. The two sensor elements 114,115 have substantially the same distance from the operating axis 104 of the operating element 102. In addition, the sensor elements 114,115 are arranged at a distance from each other on the printed circuit board 124. In particular, the two sensor elements 114,115 are spaced apart in such a manner that, in at least one switching position, for example in the first switching position, as shown, one of the signal generator elements 112 comes to lie above the sensor elements 114, 115. In particular, the sensor elements 114, 115 each have a first end region 128, and have a second end region 130 that is opposite the first end region 128. The signal generator element 112, realized as a permanent magnet, has the north pole 120 in the first end region 128, and has the south pole 122 in the second end region 130. The two sensor elements 114, 115 are each arranged adjacent to different end regions 128, 130 of the signal generator element 112. Owing to this arrangement, advantageously, the signal of the sensor element 112 above the sensor elements 114, 115 can be sensed by both sensor elements 114, 115, as shown exemplarily in FIG. 6.

(35) FIG. 6 shows a schematic illustration of the signal generator element 112 from FIG. 5 above the sensor elements 114, 115, with a diagram that exemplarily represents the magnetic flux density of the signal generator element 112 as a function of the axial position. The magnetic flux density in this case corresponds to the signal of the signal generator element 112, which is realized as an analog signal. The sensor elements 114, 115 are realized as magnetic field sensors, in particular as Hall sensors. For example, the sensor elements 114, 115 are realized as unipolar Hall sensors, the unipolar Hall sensor sensing the signal, by means of a threshold procedure, only in the region of the positive or negative polarity. For example, the sensor elements 114, 115 are realized in such a manner that the signal can be sensed in the region of the negative magnetic flux density.

(36) The sensor elements 114, 115 are each designed to determine an item of switching position information on the basis of the sensed signal of the signal generator element 112. Preferably, the sensor elements 114, 115 are designed to determine an item of switching position information on the basis of the sensed signal, the item of switching position information being zero, negative, if a threshold 132 of the magnetic flux density is not exceeded, and the item of switching position information being one, or positive, if a threshold 132 of the magnetic flux density is exceeded.

(37) The first sensor element 114, arranged in the first end region 128, senses the signal in the region of a substantially maximally positive flux density. Since the sensor elements 114, 115 perform a threshold-value comparison in the region of negative magnetic flux density, the switching position information signal of the first sensor element 114 is zero. The second sensor element 115, arranged in the second end region 130, senses the signal in the region of a minimally negative flux density that exceeds the threshold 132. A positive switching position information signal, or one, is determined. Owing to the sensor elements 114, 115 being arranged in regions of maximal or minimal magnetic flux densities, it can advantageously be ensured that, in the switching position, unambiguous determination of the item of switching position information is achieved.

(38) FIG. 7 shows the operating-mode switching device 100 in a fourth switching position, which corresponds to an anti-clockwise hammer-drilling mode. Due to the mirror-symmetrical arrangement of the signal generator elements 112, the signal generator element 112 comes to lie above the sensor elements 114,115 in reversed orientation, such that the second sensor element 115, which previously determined a positive item of switching position information, now determines a negative item of switching position information, or 0, and the first sensor element 114, which previously determined negative item of switching position information, now determines a positive item of switching position information, or one.

(39) The items of switching position information determined by the sensor elements 114, 115 are provided to the electronics system 40, which controls the hand-held power tool 10, by open-loop or closed-loop control, on the basis of this information. For this purpose the printed circuit board 124 has conductor tracks 134 that electrically connect the sensor elements 114, 115 to a socket 136 arranged on the printed circuit board 124. Via the socket 136, the operating-mode switching device 100 can be electrically connected to the electronics system 40 by means of a plug-in connection, not represented in greater detail.

(40) FIG. 8, in a flow diagram, shows a possible control procedure based on the items of switching position information provided by the operating-mode switching device 100.

(41) In a first procedure step 150, the electronics system 40 of the hand-held power tool 10 is initialized. In this initialization step, the switching position is set by the electronics system 40 to a clockwise hammer-drilling operation, such that the electric motor 18 is driven in clockwise rotation. The initialization is effected upon the hand-held power tool 10 being put into operation, for example upon the hand-held power tool 10 being connected to the battery pack 38 or upon actuation of the operating switch 32.

(42) In a further step 152, an item of switching position information is sensed at least by a first sensor element 114 and a second sensor element 115. In this case the first sensor element 114 and the second sensor element 115 sense the item of switching position information on the basis of the signal of a single signal generator element 112. The item of switching position information is binary in form, and may be 1 if the threshold 132 is exceeded, and may be 0 if the threshold 132 is not exceeded.

(43) In a following step 154, the item of switching position information is provided to the electronics system 40. For this purpose the sensor elements 114, 115 are electrically connected to the electronics system 40.

(44) In a comparison step 156, the electronics system 40 determines the switching position of the operating-mode switching device 100 on the basis of the items of switching position information of the percussion detection unit 110.

(45) If the item of switching position information of the first sensor element 114 is positive, or one, and the item of switching position information of the second sensor element 115 is negative, or zero, then, in a step 158, an anti-clockwise hammer-drilling mode is determined. Upon hammer-drilling mode having been determined, the electronics system 40 controls the drive unit 20 in anti-clockwise rotation in such a manner that the insert tool 28 is driven in anti-clockwise rotation. It is additionally conceivable that at least one electronic ancillary function is activated, deactivated or adapted. For example, it is conceivable that, upon determination of an anti-clockwise hammer-drilling mode, a percussion detection unit 202 is deactivated. Alternatively or additionally, it is conceivable to activate a rotation detection unit 204 upon determination of a hammer-drilling mode, in particular an anti-clockwise or a clockwise hammer-drilling mode. Preferably a parameter set of the rotation detection unit is adapted, such that in anti-clockwise rotation a different parameter set is used than in clockwise rotation. In particular, it is conceivable for the parameter sets to have a threshold that is dependent on the direction of rotation. Furthermore, it is conceivable for a higher rotational speed and/or a higher torque to be set in the anti-clockwise hammer-drilling mode compared to the clockwise hammer drill mode.

(46) If the items of switching position information of the two sensor elements 114, 115 are the same, the electronics system 40, in a step 160, determines a clockwise hammer-drilling mode. For example, the two items of switching position information may be zero if the marking of the operating element 102 is located between the first and the fourth switching position, and the signal of the signal generator element 112 cannot be sensed in sufficient strength by the sensor elements 114, 115. It is also conceivable for the two items of switching position information to be one if there is a strong external magnetic field acting upon the sensor elements 114, 115, thus falsifying the sensing of the switching position information.

(47) If the item of switching position information of the first sensor element 114 is negative, or zero, and the item of switching position information of the second sensor element 115 is positive, or one, then, in a step 162, a chiseling operation is determined. In chiseling operation an electronic ancillary function, namely the percussion detection unit, is activated by the electronics system 40. In particular, the percussion detection unit is activated only in chiseling operation. Alternatively, it is conceivable for a parameter set of the percussion detection unit in chipping operation to be adapted in comparison to the hammer-drilling mode. In addition, an electronic ancillary function, namely the rotation detection, is deactivated in chipping operation by the electronics system 40. In addition, it is conceivable for the position of the locking switch 33 to be provided to the electronics system 40, and for the locking of the operating switch 32 to be activated by the electronics system 40 only in the chipping-operation switching position.

(48) FIG. 9 shows an alternative embodiment of the operating-mode switching device 100a in a schematic view. The operating-mode switching device 100a has a single signal generator element 112a and five sensor elements 114a, 115a, 138a, 139a, 140a. The signal generator element 112a is substantially similar in design to the previous exemplary embodiment. The signal generator element 112a is realized as a permanent magnet, and has a north pole 120a, which comprises a first end region 128a, and a south pole 122a, which comprises a second end region 130a. In FIG. 9 the signal generator element 112a is shown in four different positions, which each correspond to a switching position. The five sensor elements 114a, 115a, 138a, 139a, 140a have substantially the same distance from the operating axis 104a of the operating-mode switching device 100a and substantially the same distance from each other. The distance between two of the sensor elements 114a, 115a, 138a, 139a, 140a is preferably selected in such a manner that the distance substantially corresponds to a length of the signal generator element 112a. Due to this arrangement, the signal of the signal generator element 112a can be sensed, in each of the four switching positions, by two of the sensor elements 114a. In a manner similar to the previous exemplary embodiment, at least two items of switching position information are provided to the electronics system of the hand-held power tool on the basis of the sensed signal.

(49) The hand-held power tool 10 according to FIG. 1 has two electronic ancillary functions, in the form of a percussion detection and a rotation detection, which are realized by the position determining unit 202 and the rotation detection unit 204. The percussion detection unit 202 and the rotation detection unit 204 are assigned to the electronics system 40 of the hand-held power tool 10.

(50) The electronics system 40 has a sensor unit 205 for sensing at least one motion variable. The sensor unit 205 comprises, for example, an acceleration sensor 206 (see FIG. 2). The acceleration sensor 206 is arranged on the printed circuit board 48 of the electronics system 40. The sensor unit 205 is designed, in particular, to provide the motion variable to the electronics system 40.

(51) The hand-held power tool 10 has an operating-switch position unit 208, which is designed to determine an operating-switch position of the operating switch 32. The operating-switch position unit 208 is arranged in the region of the operating switch 32, in particular in the handle of the hand-held power tool 10. The operating-switch position unit 208 comprises, for example, a potentiometer, but another means for determining the operating-switch position, known to persons skilled in the art, would also be conceivable. The operating-switch position unit 208 is connected to the electronics system 40, for example via a cable connection for data transmission, for the purpose of providing the operating-switch position.

(52) The battery pack 38 connected to the hand-held power tool 10 for the purpose of supplying energy has a battery-pack electronics system 210. The battery-pack electronics system 210 is designed to determine at least one battery-pack operating parameter and/or to provide the battery-pack parameter to the hand-held power tool 10, in particular to the electronics system 40 of the hand-held power tool 10. Furthermore, the battery-pack electronics system 210 is designed to provide a weight parameter to the hand-held power tool 10, in particular to the electronics system 40 of the hand-held power tool 10.

(53) The percussion detection unit 202 is designed to determine an idling mode and a percussion mode on the basis of the motion variable. The drive unit 20 of the hand-held power tool 10 is controlled by the percussion detection unit 202, or the electronics system 40, in dependence on the determined idling mode, or percussion mode. In particular, the drive unit 20 is controlled in such a manner that in the idling mode the drive unit 20 is driven with an idling rotational speed that is lower than a percussion rotational speed in the percussion mode. The percussion detection unit 202 has at least two parameter sets, the determination of the idling mode, or percussion mode, and/or the control of the drive unit 20 differing according to the parameter set used. The electronics system 40 is designed to select one of the parameter sets automatically. The selection is effected taking into account the switching position of the operating-mode switching device, the operating-switch position, the battery-pack operating parameter, the weight parameter and/or the instantaneous rotational speed of the hand-held power tool 10.

(54) The rotation detection unit 204 is designed to determine a rotation of the housing 12 of the hand-held power tool 10 on the basis of the motion variable. The drive unit 20 of the hand-held power tool 10 is controlled by the rotation detection unit 204, or the electronics system 40, in particular is braked, in dependence on the determined rotation of the housing 12 of the hand-held power tool 10. Preferably, the drive unit 20 is controlled in such a manner that the drive unit 20 is braked by a range of between 50% and 100%. Preferably, the drive unit 20 is braked to a complete standstill. The rotation detection unit 204 has at least two parameter sets, the determination of the rotation of the housing 12 and/or the control of the drive unit 20 differing according to the parameter set used. The electronics system 40 is designed to select one of the parameter sets automatically. The selection is effected taking into account the switching position of the operating-mode switching device, the operating-switch position, the battery-pack operating parameter, the weight parameter and/or the instantaneous rotational speed of the hand-held power tool 10.

(55) FIGS. 10 to 13 show examples of procedures for the selection of a parameter set, and the effect upon the determination or control by means of the percussion detection unit or rotation detection unit. The individual procedures may also be combined with each other in an appropriate manner.

(56) In FIG. 10, in a step 212, two parameter sets are provided to the percussion detection unit 202, or to the electronics system 40. The provision is effected, for example, by the storage of the two parameter sets on a storage unit of the electronics system 40, not represented.

(57) In a further step 214, an operating-switch position is provided to the electronics system 40 via the operating-switch position unit 208.

(58) If the provided operating-switch position corresponds substantially to a maximally settable operating-switch position, in a step 216 the electronics system 40 selects a first parameter set for the percussion detection unit 202. A maximally settable operating-switch position in this context is to be understood to mean, in particular, a position of the operating switch in which the operating switch is substantially fully depressed.

(59) If the provided operating-switch position corresponds to a range of between 50% and 100% of the maximally settable operating-switch position, in a step 218 the electronics system 40 selects a second parameter set for the percussion detection unit 202.

(60) If the provided operating-switch position corresponds to a range below 50% of the maximally settable operating-switch position, the percussion detection unit 202 is deactivated in a step 220.

(61) The first parameter set has a lower threshold than the second parameter set for determination of a percussion m ode. Thus, if a motion variable sensed by the sensor unit 205 is provided to the electronics system 40, or the percussion detection unit 202, it is compared with the threshold of the first or the second parameter set, and the percussion mode is not determined, or is determined much later, if the operating-switch position does not correspond to the maximally settable operating-switch position. In this way, advantageously, the number of false triggers can be reduced significantly.

(62) If a percussion mode is determined, then in a step 221 the rotational speed of the drive unit 20 is set to a percussion rotational speed. If the instantaneous rotational speed was previously the idling rotational speed, the idling rotational speed is increased to the percussion rotational speed.

(63) In FIG. 11a, in a step 222, two parameter sets are provided to the rotation detection unit 204, or to the electronics system 40. The provision is effected, for example, by the storage of the two parameter sets on a storage unit of the electronics system 40, not represented.

(64) In a further step 224, an instantaneous rotational speed of the drive unit 20 is provided to the electronics system 40. It is conceivable for the instantaneous rotational speed, or the actual rotational speed, to be determined by the electronics system 40 itself, for example by means of a current sensor or a Hall sensor.

(65) If the instantaneous rotational speed corresponds substantially to a maximally settable instantaneous rotational speed, in a step 226 the electronics system 40 selects a first parameter set for the rotation detection unit 204.

(66) If the instantaneous rotational speed corresponds to a range of between 50% and 100% of the maximally settable instantaneous rotational speed, in a step 228 the electronics system 40 selects a second parameter set for the rotation detection unit 204.

(67) If the provided instantaneous rotational speed corresponds to a range below 50% of the maximally settable instantaneous rotational speed, the rotation detection unit 204 is deactivated in a step 230.

(68) The first parameter set has a lower threshold than the second parameter set for determination of a rotation of the housing. Thus, if a motion variable sensed by the sensor unit 205 is provided to the electronics system 40, or the rotation detection unit 204, it is compared with the threshold of the first or the second parameter set, and the rotation of the housing is not determined, or is determined much later, if the instantaneous rotational speed does not correspond to the maximally settable instantaneous rotational speed. In this case also, advantageously, the number of false triggers can thus be reduced significantly. If a rotation of the housing is determined, then in a step 231 the drive unit 20, in particular the electric motor 18, is braked to a standstill.

(69) In FIG. 11b, in a step 222a, two parameter sets are provided to the rotation detection unit 204a, or to the electronics system 40. The provision is effected, for example, by the storage of the two parameter sets on a storage unit of the electronics system 40, not represented.

(70) In a further step 224a, a switching position is provided to the electronics system 40. If the switching position corresponds to a clockwise hammer-drilling mode, in a step 226a the electronics system 40 selects a first parameter set for the rotation detection unit 204. If the switching position corresponds to an anti-clockwise hammer-drilling mode, in a step 228a the electronics system 40 selects a second parameter set for the rotation detection unit 204. If the switching position corresponds to a chiseling mode, the rotation detection unit 204 is deactivated in a step 230a.

(71) The parameter sets differ, in particular, in a threshold dependent on the direction of rotation. In this context, a threshold dependent on the direction of rotation is to be understood to mean, in particular, that the threshold is selected in such a manner that a comparable rotation of the hand-held power tool in opposite directions is determined to a different extent or only in one of the two opposite directions. The comparable rotations in opposite directions in this case have substantially the same acceleration, speed, distance and angle of rotation. In particular, the threshold of the first parameter set is selected in such a manner that in clockwise rotation the determination of a clockwise rotation of the hand-held power tool is more sensitive, or triggers earlier, than a determination of an anti-clockwise rotation of the hand-held power tool. In addition, the threshold of the second parameter set is selected in such a manner that the determination of the anti-clockwise rotation of the hand-held power tool in anti-clockwise rotation is more sensitive or triggers earlier than the determination of the clockwise rotation of the hand-held power tool. In this way, advantageously, the number of false triggers can be reduced. Alternatively, it is also conceivable for the rotation-direction-dependent threshold of the first, or second, parameter set to be selected in such a manner that only clockwise or anti-clockwise rotation can be determined. The rotation detection in clockwise rotation would thus be switched off for an anti-clockwise rotation of the housing.

(72) This may be realized, for example, by the sensing of a motion variable that is dependent on the direction of rotation. A motion variable that is dependent on the direction of rotation can be sensed by used of an inertial sensor system such as, for example, an acceleration sensor, preferably a 3-axis acceleration sensor, and/or a rotation rate sensor. In particular, a motion variable can be sensed along a tangential direction with respect to the work axis 29, via which a tangential acceleration, a tangential velocity and/or a tangential distance can be determined. Preferably, the motion variable along the tangential direction is filtered by means of a high-pass filter and a low-pass filter.

(73) Thus, for example, the acceleration sensor may be realized in such a manner that the motion variable sensed is positive when the housing rotates clockwise, and is negative when the housing rotates anti-clockwise. If the motion variable in clockwise rotation exceeds a determined threshold, in particular a positive threshold, the drive unit 20, in particular the electric motor 18, is braked to a standstill in a step 231a. If the motion variable in anti-clockwise rotation falls below a determined, in particular negative threshold, the drive unit 20, in particular the electric motor 18, is likewise braked to a standstill in a step 231a.

(74) In FIG. 12, in a step 232, two parameter sets are provided in each case to the percussion detection unit 202 and to the rotation detection unit 204. The provision is effected, for example, by the storage of the two parameter sets on a storage unit of the electronics system 40, not represented.

(75) In a further step 234, a weight parameter of the battery pack 38 is provided to the electronics system 40. The weight parameter is stored, for example, in the battery pack 38, and is transmitted to the hand-held power tool 10 when the battery pack 38 is connected to the latter. Alternatively, it would be conceivable for the electronics system 40 of the hand-held power tool 10 to determine, or estimate, the weight parameter on the basis of the current provided by the battery pack 38.

(76) Two threshold comparisons are effected on the basis of the weight parameter. If the provided weight parameter is above the first threshold, or if the weight of the battery pack is above the first threshold, then, in a step 236, a first parameter set for the percussion detection unit 202 is selected by the electronics system 40. If the provided weight parameter is below the first threshold, then, in a step 238, a second parameter set for the percussion detection unit 202 is selected by the electronics system 40. The heavy the battery pack, or entire system composed of the hand-held power tool 10 and the battery pack 38, the lower the motion variable sensed by the sensor unit 205, or the vibrations acting upon the housing 12. The first parameter set for the percussion detection unit 202 therefore has a lower threshold for determination of the percussion mode than the second parameter set, in order that the percussion mode can still be determined reliably, even if the system is of a greater weight.

(77) If the weight parameter is above a second threshold, then, in a step 240, a first parameter set for the rotation detection unit 204 is selected by the electronics 40. If the weight parameter is below a second threshold, then, in a step 242, a second parameter set for the rotation detection unit 204 is selected by the electronics 40. The first parameter set for the rotation detection unit 204 has a lower threshold than the second parameter set for the rotation detection unit 204. Advantageously, this ensures that the rotation of the housing 12 of the hand-held power tool 10 is detected sufficiently rapidly to protect the user, even in the case of a heavy and inert system. By way of example, the first threshold and the second threshold are substantially identical in design. It is also conceivable, however, for the first and the second threshold to differ in design.

(78) In FIG. 13, in a step 244, two parameter sets are provided to the percussion detection unit 202. In a further step 246, a battery-pack operating parameter of the battery pack 38 is provided to the electronics system 40. The battery-pack operating parameter is transmitted, for example, from the battery pack 38 to the electronics system 40 of the hand-held power tool 10. It would also be conceivable for the battery-pack operating parameter to be determined by the electronics system 40 itself, for example via a connection to the power contacts of the battery pack 38. The battery-pack operating parameter is realized, for example, as available current.

(79) In a threshold value procedure, the battery-pack parameter, realized as available current, is compared with an optimal current. The optimal current in this case corresponds to a current at which the hand-held power tool 10 has a substantially maximal operating power. If the available current corresponds substantially to the optimal current, or if the available current is in a range of 10% of the optimal current, then, in a step 248, a first parameter set for the percussion detection unit 202 is selected by the electronics system 40. Otherwise, a second parameter set for the percussion detection unit 202 is selected by the electronics system 40 in a step 249.

(80) The first parameter set and the second parameter set in this case have the same idling rotational speed at which the drive unit 20 is driven in an idling mode determined by the percussion detection unit 202. The second parameter set has a lower percussion rotational speed than the first parameter set, at which the drive unit 20 is driven in a percussion mode determined by the percussion detection unit 202. Advantageously, the reduced percussion frequency at an available current that does not correspond to an optimal current can signal to the user that maximum power is not available, and that the battery pack 38 needs to be changed or charged. Preferably, the percussion rotational speed of the second parameter set is at least 10% lower, preferably at least 20% lower, preferably at least 30% lower, than the percussion rotation speed of the first parameter set.

(81) Represented schematically in FIG. 14, in a flow diagram, is a procedure for automatically controlling the rotational speed of the hand-held power tool 10, by open-loop or closed-loop control, by means of the percussion detection unit 202.

(82) In a first procedure step 250, the electronics system 40 of the hand-held power tool 10 is initialized. The initialization is effected upon the hand-held power tool 10 being put into operation, in particular upon actuation of the operating switch 32. In this initialization step, an idling mode is determined, or set, by the electronics system 40, or the percussion detection unit 202, such that the drive unit 20 can be driven maximally at an idling rotational speed.

(83) In a further step 252, a motion variable is sensed by the acceleration sensor 206 of the sensor unit 205. FIG. 15 shows an example of a frequency spectrum of the motion variable, the motion variable having been sensed during percussion operation. The acceleration sensor 206 is designed, in particular, to sense at least one second harmonic 282 of a percussion frequency 278 of the percussion mechanism 24. For example, the acceleration sensor 206 is designed to sense the motion variable in a frequency range of between 0 and 200 Hz. The frequency spectrum has three peaks, or maxima, the first peak corresponding to the percussion frequency 278 of the percussion mechanism 24. The percussion frequency 278 is, for example, approximately 40 Hz. The second peak corresponds to the first harmonic 280 of the percussion frequency 278, at approximately 80 Hz, and the third peak corresponds to the second harmonic 282 of the percussion frequency 278, at approximately 120 Hz. The sensing of the motion variable is effected, for example, every 5 ms, an thus the sensing interval is, for example, 5 ms. However, shorter sensing intervals such as, for example, 2 ms or under 1 ms, are also conceivable in order to increase the number of sensed motion variables, or to improve the accuracy of the determination of the percussion mode.

(84) In a step 254, the motion variable if filtered by means of a filter unit. The filter unit is realized, for example, as a high-pass filter that has a cut-off frequency below the percussion frequency 278. For example, the cut-off frequency is 20 Hz, but a cut-off frequency of 10 Hz is also advantageous. The high-pass filter is realized as an IIR filter, the filter characteristic of which corresponds to a Chebyscheff filter. This advantageously enables a good edge steepness to be realized in the passband range. Alternatively, it is also conceivable for the filter characteristic to correspond to a Bessel filter. This advantageously enables a constant group delay time to be realized in the passband range. Conceivable as a further advantageous alternative is a filter characteristic that corresponds to a Butterworth filter. This advantageously enables a good amplitude response to be realized in the passband range and stop range.

(85) In a step 256, the filtered motion variable 284 is provided to the electronics system 40, or the percussion detection unit 202. The electronics system 40, or the percussion detection unit 202, has a verification interval 285, in which a threshold value procedure 258 is executed. The verification interval 286 is in a range of between two and three percussion periods, for example approximately 50 ms. Within a verification interval, therefore, the steps 252, 254 and 256 are repeated a total of ten times until the threshold value procedure can be executed on the basis of the sensed motion variables.

(86) Various threshold value procedures are conceivable for determining the percussion mode on the basis of the filtered motion variable. For example, a mean value or a median value of the motion variable within the verification interval may be determined, and this may be compared with a threshold or with a previously determined mean value or median value. Alternatively, it would also be conceivable for only a maximum or minimum value of the motion variable in the verification interval to be compared with a threshold or with a previous value.

(87) The threshold value procedure, used as an example, is represented schematically in FIG. 16. A maximum value and a minimum value of the filtered motion variable 284 is determined within the verification interval 286, and the difference 288 is formed from these two values. This difference 288 is compared with a threshold 290. If the difference 288 is greater than a threshold 290, a percussion mode is determined in a step 260. If the difference 288 is less than the threshold 290, an idling mode is determined in a step 262. In the example shown, an idling mode is determined in the first verification interval 286 and a percussion mode is determined in the second verification interval 286.

(88) If the percussion mode is determined, the rotational speed of the drive unit 20 is increased, in a step 264, from an idling rotational speed to a percussion rotational speed. Advantageously, the idling frequency of the percussion mechanism 24 is thereby also increased to a percussion frequency of the percussion mechanism 24, thereby increasing the material removal rate of the hand-held power tool 10.

(89) Following the changing of the rotational speed, the determination of the percussion mode, or idling mode, is paused in a step 266. For this purpose, the electronics system 40, or the percussion detection unit 202, has a pause interval in which the determination of the percussion mode, or idling mode, is paused. In particular, the pause interval is longer than the verification interval 286. Preferably, the pause interval is at least twice as long as the verification interval 286, preferably at least four times as long as the verification interval. In this way, advantageously, toggle effects can be avoided.

(90) Following the pause interval, the steps 252, 254 and 256 are repeated, and the filtered motion variables are provided to the electronics system 40, or the percussion detection unit 202. In the percussion mode the filtered motion variables undergo a threshold value procedure 268, which corresponds substantially to the threshold value procedure 258 in the idling mode. The two threshold value procedures 258, 268 differ, in particular, in the verification interval, which is different. In particular, the verification interval in the percussion mode is longer than in the idling mode. Preferably, the verification interval in the percussion mode is at least 50% longer than in the idling mode, preferably at least twice as long. Alternatively or addition, it would likewise be conceivable for the threshold in the percussion mode to be greater or less than in the idling mode. If the threshold is exceeded, a percussion mode is further determined in a step 270, and the threshold value procedure 268 is executed repeatedly.

(91) If the value is below the threshold, an idling mode is determined in a step 272. The percussion rotational speed of the drive unit 20 is thereupon reduced to an idling speed in a step 274, and a pause analogous to the pause in percussion mode follows in a step 264. The threshold value procedure 258 is then executed again in the idling mode until a percussion mode is determined.

(92) The thresholds in the threshold value procedures 258, 268 in this case are dynamic. In particular, the dynamic threshold is selected in dependence on a position of the hand-held power tool, an operating-mode switch position, an operating-switch position, a weight of a battery pack, an instantaneous rotational speed, etc. Alternatively, it would likewise be conceivable for the thresholds in the threshold value procedures 258, 268 to be static, and therefore always the same.