Power tool, especially rotary hammer

Abstract

The invention relates to an electric power tool, in particular a rotary hammer, which can be operated in a first and at least one further operating mode, with a drive unit (12) for a drive of an insert tool (14), with a computing unit (16) which is provided for controlling or regulating the drive unit (12) in such a way that it automatically detects an activated operating mode, and with a sensor unit (18) which is coupled to the computing unit (16) and is provided for detecting at least one environmental condition. It is proposed that the computing unit (16) be designed to provide at least one additional operating function that can be activated in the further operating mode in such a way that it activates or suspends the additional operating function depending on at least one environmental condition and operator behavior and automatically deactivates the additional operating function permanently in the first operating mode.

Description

State of the art

[0001] An electric power tool, in particular a rotary hammer, which can be operated in a first and at least one further operating mode, has already been proposed, comprising a drive unit for a drive of an insert tool, a computing unit which is provided for controlling or regulating the drive unit in such a way that it automatically detects an activated operating mode, and a sensor unit which is coupled to the computing unit and is provided for detecting at least one environmental condition.

[0002] One of the most common problems encountered when using an electronic auxiliary operating function, such as ASC, is the discrepancy between the tool's expected behavior and its actual behavior. The operator presses a control switch and expects the power tool to run at full power. Because the power tool is electronically driven, it can respond differently depending on the configuration set due to the embedded electronic auxiliary operating function. This discrepancy is perceived negatively by the operator if they are unaware that the electronic auxiliary operating function is activated and therefore alters the standard behavior.

[0003] An example of this problem is the "mode selection" on rotary hammers. The rotary hammer offers two operating modes: Auto and Soft. Auto is the mode that delivers full power, and Soft is the mode that delivers limited power. If the operator uses the power tool and doesn't realize it's in "Soft" mode, they may get the impression that the tool isn't powerful enough.

[0004] Another example is an additional operating function in the form of an "ECO" mode. The operator can activate the ECO mode so that the power tool operates at reduced power to maximize the number of work cycles. If the operator runs the power tool for intensive work with the ECO mode activated, the tool may not be able to deliver the required power and could therefore stall and stop.

[0005] Another example is an auxiliary operating function in the form of an ASC mode. The power tool operates at reduced power as long as no impact operation is detected. If the operator uses the power tool for testing purposes in the workshop, for example, the power tool will be perceived as not being very powerful. Disclosure of the invention

[0006] The invention relates to an electric power tool, in particular a rotary hammer, which can be operated in a first and at least one further operating mode, with a drive unit for a drive of an insert tool, with a computing unit which is provided for controlling or regulating the drive unit in such a way that it automatically detects an activated operating mode, and with a sensor unit which is coupled to the computing unit and is provided for detecting at least one environmental condition.

[0007] It is proposed that the computing unit be designed to provide at least one additional operating function that can be activated in the further operating mode, such that it activates or suspends the additional operating function depending on at least one environmental condition and operator behavior, and automatically deactivates the additional operating function permanently in the first operating mode.

[0008] In this context, the term "electrical power tool" refers specifically to a machine tool that is at least partially electrically powered, and in particular, portable. The electric power tool may be powered by either a battery or a mains connection. The term "portable machine tool" refers specifically to a machine tool for machining workpieces that can be transported by an operator without the need for transport equipment. The portable machine tool has a mass that is less than 40 kg, preferably less than 10 kg, and most preferably less than 5 kg. Preferably, the electric power tool is a handheld machine tool.The term "handheld power tool" shall be understood to mean, in particular, a workpiece-machining machine, preferably a drill, a rotary hammer and / or impact hammer, a saw, a planer, a screwdriver, a milling machine, a grinder, an angle grinder, a garden tool, and / or a multi-tool. Preferably, the power tool is a rotary hammer that enables both drilling and chiseling operations. Most preferably, the power tool has three operating modes. Preferably, the operating modes include at least a drilling mode, a chiseling mode, and / or an impact drilling mode.

[0009] The first and second operating modes are specifically designed for different applications. Preferably, at least one, and preferably several, operating parameters of the power tool, more preferably of the drive unit and / or gearbox of the power tool, differ between the operating modes.

[0010] The drive unit is specifically designed for the direct or indirect drive of a tool holder for receiving the tool. The drive unit is preferably formed by a motor, and more preferably by an electric motor. The power tool preferably has a tool holder for receiving and securing the tool. The tool holder can be, for example, a drill chuck or a quick-release chuck, such as an SDS chuck.

[0011] In this context, a "sensor unit" is understood to mean, in particular, a unit designed to record at least one characteristic parameter and / or a physical property, whereby the recording can be active, such as by generating and transmitting an electrical measurement signal, and / or passive, such as by detecting changes in the properties of a sensor component. Various sensor units that would appear suitable to a person skilled in the art are conceivable.

[0012] The term "computing unit" is understood to mean, in particular, a unit with an information input, information processing, and information output. Advantageously, the computing unit comprises at least a processor, memory, input and output means, other electrical components, an operating program, control routines, and / or calculation routines. Preferably, the components of the computing unit are arranged on a common circuit board and / or advantageously in a common housing. The phrase "the computing unit is designed to automatically detect an activated operating mode" is understood to mean, in particular, that the computing unit is designed, at least during operation, to automatically detect an operating mode selected, in particular by an operator, and especially independently of a data connection between a mode selector switch and the computing unit.Preferably, the power tool has a mode selector switch by which an operator can select a desired operating mode. The mode selector switch can be either a mechanical switch, which interacts particularly with a gearbox of the power tool, or an electronic switch. Preferably, the processing unit is designed to detect a selected operating mode based on the operating behavior of the power tool. This operating behavior can be detected, in particular, by means of sensors such as accelerometers or the like. Alternatively, it would also be conceivable for the processing unit to automatically select and set an operating mode.

[0013] The processing unit is designed to provide an additional operating function that can be activated in the additional operating mode. Preferably, the additional operating function is specific to the additional operating mode. Preferably, the additional operating function is inactive in at least one of the operating modes of the power tool. Preferably, the additional operating function can be activated and deactivated in the additional operating mode. Particularly preferably, the additional operating function is only temporarily active in the additional operating mode. The additional operating function is activated and / or deactivated automatically by the processing unit in the additional operating mode. The additional operating function is permanently ready for operation in the additional operating mode and is held in reserve for activation.Several additional operating functions that a specialist would consider useful are conceivable, such as a soft start, speed control, speed reduction, an ECO mode, or similar features. The specific additional operating function depends in particular on the type of power tool and the operating mode.

[0014] In this context, "permanent deactivation" means, in particular, that the auxiliary operating function remains deactivated for the duration of the current operation and / or the current operation in a given operating mode. Preferably, the state of the auxiliary operating function is reset each time the power tool is restarted or begins operation.

[0015] The design of the power tool according to the invention allows for a particularly high level of user-friendliness. Specifically, it enables the automatic activation and deactivation of an auxiliary operating function, without impairing the user experience. In particular, it minimizes the intervention of the processing unit in the operator's perception and enables the operator to select the optimal tool operation for each application, without requiring the operator to activate the auxiliary operating function by pressing a button or via their smartphone. Side benefits include cost savings on additional sensors and hardware, such as pushbuttons, indicator LEDs, sensors, or the like. The invention allows for the addition of a level of intelligence to the power tool, so that the operator is not the decisive factor in activating or deactivating functions.For each auxiliary operating function, it can be further specified whether the function should always be activated or whether the operator should be given the option to select which auxiliary operating functions are relevant to them. During operation, the processing unit decides when the auxiliary operating function is activated or deactivated, depending on various conditions that may or may not be directly related to the user's selection. The advantage of such a solution is that the auxiliary operating functions are only activated when they are actually needed. Once a function is ready for operation, the tool activates it when all conditions are met.

[0016] Furthermore, it is proposed that the processing unit be designed at the start of operation to keep the auxiliary operating function completely deactivated until another operating mode has been detected. In this context, "keep deactivated" means, in particular, that the auxiliary operating function remains deactivated even when the operating conditions relevant to the auxiliary operating function are met. These operating conditions are, in particular, independent of the operating mode. Preferably, the auxiliary operating function is only activated or put into operational mode once it has been reliably detected that the power tool is in the other operating mode.This prevents the operator from accidentally activating the additional operating function in the first operating mode, which could result in the operator drilling at a reduced speed or feeling that the power tool does not have sufficient power.

[0017] Furthermore, it is proposed that the processing unit be designed to operate the auxiliary operating function in such a way that the auxiliary operating function is permanently set to an operational mode in the other operating mode. Preferably, the auxiliary operating function remains in the operational mode during unchanging use until the power tool is switched off or until it is switched to another operating mode. In this context, "permanently" means, in particular, that the auxiliary operating function remains in an operational mode for the duration of the current operation during unchanging use and / or the current operation in another operating mode. Preferably, the state of the auxiliary operating function is reset each time the power tool is restarted or begins operation. This allows for intuitive access to the auxiliary operating function.In particular, constant monitoring of the operating mode can be avoided. Furthermore, the ready-to-use mode enables rapid activation of the auxiliary operating function. In ready-to-use mode, the processing unit continuously checks whether the operating conditions relevant to the auxiliary operating function are met, and if so, the auxiliary operating function is activated directly. The operating conditions consist primarily of the detected environmental conditions and the operator's behavior. Environmental conditions can include, for example, contact between the tool and the workpiece, or environmental parameters such as ambient pressure, ambient temperature, the position of the power tool, or similar factors. A distinction can be made, for example, between two cases.If the user operates the control switch and the external conditions for activating the auxiliary operating function are not met, then the auxiliary operating function is deactivated, so the drive unit operates at maximum speed, controlled by the processing unit. If, at a specific time, the external conditions are met, the auxiliary operating function is activated, and the operating speed of the drive unit is calculated by the processing unit based on these external conditions.

[0018] It is further proposed that the first operating mode be a drilling mode. It is further proposed that the second operating mode be an impact mode or an impact drilling mode. Preferably, the power tool is a rotary hammer that can be switched between a drilling mode, an impact mode, and / or an impact drilling mode by means of an operating mode selector switch. Preferably, the power tool has at least three operating modes. However, other configurations of the power tool and / or the operating modes that would appear sensible to a person skilled in the art would also be conceivable. Preferably, the processing unit can distinguish between a drilling mode and an impact or impact drilling mode by means of impact detection.Preferably, the computing unit is designed to assume that the power tool is in the first operating mode, namely the drilling mode, until an impact is detected and the computing unit recognizes the next operating mode, namely the impact or impact drilling mode.

[0019] Furthermore, it is proposed that the auxiliary operating function be comprised of adaptive speed control. Specifically, the auxiliary operating function is comprised of an ASC (Automatic Speed ​​Control) function. This function offers improved control over the power tool when it is operating, for example, in impact mode, particularly in chiseling mode. The processing unit and / or sensor unit can detect when the cutting tool is in contact with the material. Therefore, the power tool can deliver full power when contact is present and reduced power when no contact is present. The advantages of this function include, for example, optimized battery life, noise and vibration reduction, and the ability to use hammer drilling in sensitive materials.Conditions for activating speed control, particularly a reduction in speed, could include, for example, an active impact function and the absence of contact detection between the tool and the material. Alternatively or additionally, the auxiliary operating function could be an intelligent ECO mode. A battery level of less than 50% could be a condition for activating the ECO mode. This could provide a particularly advantageous auxiliary operating function that can be automatically activated and deactivated by the processing unit.

[0020] Furthermore, it is proposed that the power tool has an impact unit, wherein the sensor unit is provided for detecting an impact from the impact unit. Preferably, the sensor unit comprises, in particular, an acceleration sensor, a vibration sensor, and / or a contact sensor within the impact unit. However, other configurations of the sensor unit that would appear advantageous to a person skilled in the art are also conceivable. In particular, the impact unit is designed as a pneumatic impact unit. This allows, in particular, advantageous detection of an impact from the impact unit, whereby the detection of the impact can advantageously be further processed by the processing unit.

[0021] It is further proposed that the power tool have an operating switch coupled to the computing unit, which is designed for operation by the operator and has several actuation stages. An "operating switch" is understood to be, in particular, an element designed to receive an input value from an operator during an operating process and, in particular, to be directly contacted by an operator, whereby contact with the operating element is sensed and / or an actuating force exerted on the operating element is sensed and / or mechanically transmitted to actuate a unit. Preferably, the operating switch is formed by a trigger that enables position-dependent actuation. The operating switch serves, in particular, to activate the operation of the power tool.Preferably, the speed of the drive unit of the power tool can be set using the control switch, particularly depending on the actuation distance. A soft start can be performed using the control switch. This provides a particularly advantageous control element for the power tool.

[0022] Furthermore, the invention relates to a method for operating the power tool. It is proposed that, in a detection step, an activated operating mode is detected by the processing unit, and upon detection of another operating mode, the auxiliary operating function is switched to an operational mode. Preferably, the processing unit automatically detects an operating mode selected, in particular by an operator, during operation, especially independently of a data connection between a mode selector switch and the processing unit. The processing unit detects a selected operating mode based on the operating behavior of the power tool. This operating behavior can be detected, in particular, by means of sensors, such as accelerometers or the like. Alternatively, it would also be conceivable for the processing unit to automatically select and set an operating mode.This allows the processing unit to automatically provide additional operating functions depending on the operating mode. In particular, it prevents the processing unit from activating additional operating functions that are incompatible with the corresponding operating mode.

[0023] Furthermore, it is proposed that the processing unit keep the auxiliary operating function completely deactivated at the start of operation until another operating mode is detected during the acquisition step. Preferably, the auxiliary operating function remains deactivated in this state even if the operating conditions relevant to the auxiliary operating function are met. These operating conditions are, in particular, independent of the operating mode. Preferably, the auxiliary operating function is only activated or put into operational mode once it has been reliably detected that the power tool is in the other operating mode. This prevents the auxiliary operating function from being activated for an operator in the first operating mode, thus avoiding situations where the operator, for example, drills at a reduced speed or feels that the power tool lacks sufficient power.

[0024] It is further proposed that, in the additional operating mode, the processing unit automatically activates the auxiliary operating function depending on at least one environmental condition and operator behavior. In the operational mode, the processing unit continuously checks whether the operating conditions relevant to the auxiliary operating function are met, and if so, the auxiliary operating function is activated directly. The operating conditions consist, in particular, of the detected environmental conditions and the operator behavior. Environmental conditions can include, for example, contact between the tool and the workpiece, or environmental parameters such as ambient pressure, ambient temperature, the position of the power tool, or the like.

[0025] The power tool according to the invention and the method are not to be limited to the application and embodiment described above. In particular, the power tool according to the invention and the method may, to achieve a functionality described herein, have a different number of individual elements, components, units, and process steps than that specified herein. Furthermore, values ​​within the specified limits of the value ranges stated in this disclosure are also to be considered disclosed and freely usable. drawing

[0026] Further advantages will become apparent from the following description of the drawing. The drawing illustrates an embodiment of the invention. The drawing, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0027] They show: Fig. 1 An electric power tool according to the invention comprising a drive unit, a computing unit, a sensor unit and an operating switch in a schematic representation, Fig. 2 a schematic flowchart of a method for operating the electric machine tool according to the invention, Fig. 3 a schematic diagram of the drive power of the drive unit of the electric tool according to the invention over time in a percussion drilling operating mode and Fig. 4 a schematic diagram of the drive power of the drive unit of the electric tool according to the invention over time in a percussion operating mode. Description of the exemplary embodiment

[0028] Fig. Figure 1 shows a power tool 10. The power tool 10 is a rotary hammer, in particular a battery-powered rotary hammer. The power tool 10 has an impact unit 20 with a pneumatic impact mechanism. The power tool 10 has the impact unit 20 for generating an impact impulse, in particular an axial one, onto a tool 14 that can be arranged in a tool holder 26 of the power tool 10. The power tool 10 has the tool holder 26. Furthermore, the power tool 10 has a drive unit 12 for driving the tool 14. The drive unit 12 is an electric motor. The power tool 10 also has a gearbox 28 arranged between the drive unit 12 and the tool holder 26.Furthermore, the power tool 10 has a housing 32 in which the drive unit 12, the impact unit 20 and the gearbox 28 are arranged.

[0029] Furthermore, the power tool 10 has a mode selector switch 30 that interacts with the gearbox 28 and the impact unit 20. The mode selector switch 30 is used for the manual selection and setting of an operating mode of the power tool 10. The power tool 10 has, by way of example, three operating modes. The power tool 10 has a first operating mode and two further operating modes. The first operating mode is a drilling mode. The first further operating mode is an impact drilling mode. The second further operating mode is an impact mode. The mode selector switch 30 interacts mechanically with the gearbox 28 and the impact unit 20 to implement the operating modes. The mode selector switch 30 is located on the outside of the housing 32.

[0030] Furthermore, the power tool 10 has a processing unit 16, which is intended for operating the drive unit 12 in at least one operating state. The processing unit 16 is intended for speed control of the drive unit 12. The power tool 10 also has a sensor unit 18, which is coupled to the processing unit 16 and is intended for detecting at least one environmental condition. The sensor unit 18 is intended for detecting an impact from the impact unit 20. The sensor unit 18 includes, by way of example, an accelerometer. However, other configurations of the sensor unit that would appear useful to a person skilled in the art are also conceivable. During operation, the processing unit 16 is intended to automatically detect an activated operating mode. The processing unit 16 is intended to detect a selected operating mode based on the operating behavior of the power tool 10.The operating behavior is recorded using sensor unit 18.

[0031] The computing unit 16 is designed to provide at least one additional operating function that can be activated in the additional operating mode. The additional operating function is specific to the additional operating modes. In particular, the additional operating function is inactive at least in the first operating mode of the power tool 10. Furthermore, the additional operating function can be activated and deactivated in the additional operating modes. Preferably, the additional operating function is only temporarily active in the additional operating modes. In the additional operating mode, the computing unit 16 activates and / or deactivates the additional operating function automatically. In the additional operating mode, the additional operating function is permanently ready for operation and is held in reserve for activation.Several additional operating functions that a specialist would consider useful are conceivable, such as a soft start, speed control, speed reduction, an ECO mode, or the like. The specific additional operating function depends in particular on the type of power tool and the operating mode. An example of an additional operating function is adaptive speed control. An example of an additional operating function is an ASC function.

[0032] This function offers improved control over the power tool when it is in impact mode, particularly in chisel mode. However, other auxiliary operating functions that would seem useful to a specialist are also conceivable. In particular, it would be conceivable that the processing unit 16 has several auxiliary operating functions, each assigned to the same or different operating mode. In the second operating mode, the processing unit 16 is designed to automatically activate and deactivate the auxiliary operating function depending on at least one environmental condition and operator behavior. Furthermore, in the first operating mode, the processing unit 16 is designed to automatically and permanently deactivate the auxiliary operating function. The processing unit 16 and the sensor unit 18 can detect when the tool 14 comes into contact with the material.a workpiece. Therefore, the power tool 10 can deliver full power when contact is present and reduced power when no contact is present. The advantages of this function include, for example, optimized battery life, noise and vibration reduction, and the use of hammer drilling in sensitive materials. Conditions for activating the speed control, particularly a speed reduction, can include, for example, an active impact function and the absence of contact detection between the tool and the material.

[0033] Furthermore, at the start of operation, the processing unit 16 is designed to keep the auxiliary operating function completely deactivated until one of the other operating modes has been detected. The auxiliary operating function remains deactivated in this state, in particular, even if the operating conditions relevant to the auxiliary operating function are met. These operating conditions are, in particular, independent of the operating mode. Preferably, the auxiliary operating function is only activated or put into operational mode once it has been reliably detected that the power tool 10 is in the other operating mode. Furthermore, the processing unit 16 is designed to permanently put the auxiliary operating function into operational mode within the other operating mode.Preferably, the auxiliary operating function remains in the ready-to-use mode during unchanging use until the power tool 10 is switched off or until it is switched to another operating mode.

[0034] Furthermore, the power tool 10 has an operating switch 22 coupled to the processing unit 16, which is intended for operation by the operator and has several actuation stages. The operating switch 22 is formed by a trigger that enables position-dependent actuation. The operating switch 22 serves to activate the operation of the power tool 10. Using the operating switch 22, the speed of the drive unit 12 of the power tool 10 can be set, in particular depending on the actuation position. A soft start can be performed using the operating switch 22. The operating switch 22 is directly coupled to the processing unit 16 and only indirectly to the drive unit 12. During operation, the position of the operating switch 22 is therefore detected by the processing unit 16, and the drive unit 12 is controlled depending on this position.The operating switch 22 is arranged on a handle 34 of the power tool 10. The handle 34 is, by way of example, formed by a bow handle arranged on the housing 32.

[0035] Fig. Figure 2 shows a schematic flowchart of a procedure for operating the power tool 10. The procedure begins with a commissioning step 36. In commissioning step 36, the power tool 10 is prepared for operation. For example, an operator takes the power tool 10 out of its case and selects and sets the desired operating mode. Operation then begins. At the start of operation, a detection step 24 is performed. In detection step 24, the processing unit 16 detects an activated operating mode and, upon detection of another operating mode, sets the auxiliary operating function to an operational mode.During operation, the processing unit 16 automatically detects an operating mode selected by the operator, specifically without a data connection between a mode selector switch 30 and the processing unit 16. The processing unit 16 detects a selected operating mode based on the operating behavior of the power tool 10. This operating behavior is detected primarily by means of the sensor unit 18. At the beginning of operation, the processing unit 16 keeps the auxiliary operating function completely deactivated until another operating mode is detected in detection step 24.

[0036] If no impact is detected by sensor unit 18, the processing unit 16 starts in the first operating mode and the auxiliary operating function remains deactivated. A drilling operation step 38 then follows. If drilling operation step 38 is completed or interrupted, a test or termination step 44 follows, and either the detection step 24 is performed again or the operation is terminated. It would also be conceivable, in principle, for the detection step 24 to be performed continuously during operation.

[0037] When an impact is detected by the sensor unit 18, the processing unit 16 assumes one of the other operating modes and activates the auxiliary operating function in a subsequent impact drilling operation step 40 or an impact operating step 42. This is followed by a processing step 46 or 48, in which it is determined whether the auxiliary operating function should be activated. In the operational mode or in processing steps 46 and 48, the processing unit 16 continuously checks whether the operating conditions relevant for the auxiliary operating function are met. If the operating conditions are met, the auxiliary operating function is activated directly in an activation step 50 or 52. The operating conditions consist of the detected environmental conditions and the operator's behavior. Environmental conditions can include, for example, contact between the tool and the workpiece.In the present embodiment, an impact from the impact unit 20 is detected as an environmental condition. During operation in the impact drilling step 40 or the impact operating step 42, the auxiliary operating function is automatically activated or deactivated by the processing unit 16. In the other operating modes, the processing unit 16 automatically activates the auxiliary operating function depending on at least one environmental condition and operator behavior. If the impact drilling step 40 or the impact operating step 42 is terminated or interrupted, a test or termination step 44 follows, and the detection step 24 is performed again, or the operation is terminated. It would also be conceivable, in principle, for the detection step 24 to be performed continuously during operation.

[0038] Fig. Figure 3 shows a schematic diagram of the drive power of the drive unit 14 of the power tool 10 according to the invention over time in a percussion drilling mode. In this diagram, the control unit 16 assumes that the operator intends to drill a hole using the percussion function. The operator uses the variable control switch 22 to start drilling a workpiece at a low speed and then to increase the speed to full speed (Section 54). During acceleration to maximum speed, the control unit 16 detects a percussion impact from the impact mechanism 20 and activates the auxiliary operating function. The detected impacts are indicated by hatched stars 56.Since the operator is running the power tool 10 at full drive power and impacts continue to be detected, the auxiliary operating function remains in standby mode and is suspended (Section 58). The operator then withdraws the power tool 10 to vent the borehole, so that no impact can be detected by the processing unit 16. No detected impacts are indicated by unhatched stars 60. The processing unit 16 activates the auxiliary operating function and the speed of the drive unit 12 is reduced to, for example, 75% (Section 62). If the operator drills again, another impact is detected and the auxiliary operating function is suspended. The speed of the drive unit 12 is set back to 100% (Section 64). When operation is terminated, the auxiliary operating function is automatically deactivated.

[0039] Fig.Figure 4 shows a schematic diagram of the drive power of the drive unit 14 of the power tool 10 according to the invention over time in an impact mode. In this diagram, the control unit 16 assumes that the operator, for example, wants to remove tiles. The operator uses the variable control switch 22 to start chiseling at a low speed and then increase the speed to full speed (Section 66). During acceleration to maximum speed, the control unit 16 detects an impact from the impact mechanism 20 and activates the auxiliary operating function. The detected impacts are indicated by hatched stars 56. Since the operator operates the power tool 10 at full drive power and impacts continue to be detected, the auxiliary operating function remains in the active mode and is deactivated (Section 68).The operator then withdraws the power tool 10, for example, to resume cutting, so that no impact is detected by the processing unit 16. No detected impacts are indicated by unhatched stars 60. The processing unit 16 activates the auxiliary operating function, and the speed of the drive unit 12 is reduced to, for example, 75% (section 70). If the operator chisels again, an impact is detected once more, and the auxiliary operating function is deactivated. The speed of the drive unit 12 is then set back to 100% (section 72). When operation is terminated, the auxiliary operating function is automatically deactivated.

Claims

[1] Power tool, in particular rotary hammer, which can be operated in a first and at least one further operating mode, comprising a drive unit (12) for a drive of an attachment tool (14), a computing unit (16) which is provided for controlling or regulating the drive unit (12) in such a way that it automatically detects an activated operating mode, and a sensor unit (18) which is coupled to the computing unit (16) and is provided for detecting at least one environmental condition, characterized by , that the computing unit (16) is designed to provide at least one additional operating function that can be activated in the further operating mode in such a way that it activates or suspends the additional operating function depending on at least one environmental condition and operator behavior and automatically deactivates the additional operating function permanently in the first operating mode. [2] Power tool according to claim 1, characterized by , that the computing unit (16) is designed at the start of an operation to keep the auxiliary operating function completely deactivated until another operating mode has been detected. [3] Power tool according to claim 1 or 2, characterized by , that the computing unit (16) is designed to operate the auxiliary operating function in such a way that the auxiliary operating function is permanently placed in an operational mode in the further operating mode. [4] Power tool according to any one of the preceding claims, characterized by , that the first operating mode is formed by a drilling operating mode. [5] Power tool according to any one of the preceding claims, characterized by , that the further operating mode is formed by a percussion drilling or a percussion operating mode. [6] Power tool according to any one of the preceding claims, characterized bythat the additional operating function is formed by an adaptive cruise control. [7] Power tool according to any one of the preceding claims, characterized by a percussion unit (20), wherein the sensor unit (18) is provided for detecting a strike of the percussion unit (20). [8] Power tool according to any one of the preceding claims, characterized by an operating switch (22) coupled to the computing unit (16), which is intended to be actuated by the operator in an operation and which has several actuation stages. [9] Method for operating the power tool according to any one of the preceding claims, characterized by , that in a detection step (24) an activated operating mode is detected by means of the computing unit (16) and, upon detection of the further operating mode, the additional operating function is put into an operational mode. [10] Method according to claim 9, characterized by , that the computing unit (16) keeps the additional operating function completely deactivated at the beginning of an operation until another operating mode is detected in the acquisition step (24). [11] Method according to claim 9 or 10, characterized by , that the computing unit (16) in the further operating mode automatically activates the additional operating function depending on at least one environmental condition and operator behavior.

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