Electric tool and control method thereof

Abstract

The present invention relates to the field of electric tools, and discloses an electric tool and a control method. The electric tool includes a motor, an impact mechanism, a mode switching member, a detection member, and a controller. The impact mechanism can use the driving force of the motor to form an impact on the main shaft along the main shaft axis in the impact mode; the mode switching member can move between a first position and a second position, and when the mode switching member is in the first position, the electric tool is in the impact mode, and when the mode switching member is in the second position, the electric tool is in the non-impact mode; the controller is used to control the motor duty cycle according to the stroke of the trigger switch, and is also used to adjust the motor duty cycle corresponding to the minimum stroke of the trigger switch to a preset value greater than zero when the current position of the mode switching member detected by the detection member is the first position. Therefore, when in the impact mode, the motor can also provide sufficient driving force to form an impact on the main shaft along the main shaft axis when the trigger stroke is small, so as to achieve rapid hammer start.

Description

Technical Field

[0001] The present invention relates to the technical field of electric tools, and in particular to an electric tool and a control method thereof. Background Art

[0002] Power tools are widely used hand-held tools, which have gradually replaced pure manual tools. Among them, electric drilling tools, as the most commonly used handheld power tools, have been widely researched and developed.

[0003] The output power of electric drilling tools is mainly adjusted by pulling the trigger to adjust the motor duty cycle. Common triggers are generally made of potentiometers, which are usually composed of a resistor and a movable brush. When the brush moves along the resistor, the output end can obtain a voltage value that is related to the displacement. Specifically for electric drilling tools, as the amount of trigger pulling increases, the voltage value obtained by the controller end also increases. The duty cycle of the motor is determined based on the correspondence between the pre-stored voltage value and the motor duty cycle. In general, the larger the voltage value, the larger the motor duty cycle, that is, the larger the amount of trigger pulling, the larger the motor duty cycle. Conversely, the smaller the amount of trigger pulling, the smaller the motor duty cycle, the lower the power, the smaller the torque, and the smaller the driving force.

[0004] When the power tool is in impact mode, the driving force of the motor is small when the trigger is pulled less. The impact mechanism is often unable to form an impact on the spindle along the axis of the spindle under a small driving force, resulting in failure to start the hammer. The hammer can only be successfully started by increasing the trigger pull amount. The hammer starting speed is slow, resulting in lower efficiency of the power tool. Summary of the invention

[0005] Based on this, it is necessary to provide an electric tool and a control method thereof to address the problems of slow hammer starting speed and low working efficiency when the electric tool is in impact mode.

[0006] An electric tool, comprising:

[0007] case;

[0008] Trigger switch;

[0009] A spindle is disposed in the housing and has a tool head mounted on its end;

[0010] A motor, disposed in the housing, for providing a driving force;

[0011] An impact mechanism, capable of using the driving force of the motor to drive the spindle to reciprocate along the axial direction of the spindle in the impact mode;

[0012] A mode switching member, operable to move between a first position and a second position, wherein when the mode switching member is in the first position, the power tool is in an impact mode, and when the mode switching member is in the second position, the power tool is in a non-impact mode;

[0013] A detection member, used for detecting a current position of the mode switching member;

[0014] A controller, electrically connected to the detection member, the trigger switch, and the motor, respectively, and controlling the duty cycle of the motor according to the stroke of the trigger switch;

[0015] The controller is also used to adjust the motor duty cycle corresponding to the minimum stroke of the trigger switch to a preset value greater than zero when it is determined that the current position of the mode switching member detected by the detection member is the first position.

[0016] In one embodiment, the detection member includes a first detection element and a second detection element, one of the first detection element and the second detection element is fixed to the mode switching member, and the other of the first detection element is fixed to the housing, when the mode switching member is in the first position, the second detection element falls within the detection range of the first detection element, and when the mode switching member is in the second position, the second detection element does not fall within the detection range of the first detection element.

[0017] In one embodiment, the shell is sleeved on the outside of the mode switching member, the outer wall of the mode switching member is provided with a first groove, the inner wall of the shell is provided with a second groove, one of the first detection element and the second detection element is fixed in the first groove, and the other of the two is fixed in the second groove.

[0018] In one embodiment, the first detection element is a Hall sensor, and the second detection element is a magnet.

[0019] In one embodiment, the first detection element is a proximity sensor, and the second detection element is a magnet.

[0020] In one embodiment, the first detection element is an optical sensor, and the second detection element is an optical identification code.

[0021] In one embodiment, the optical sensor is a laser sensor, and the optical identification code is a plurality of concave-convex structures arranged at intervals.

[0022] In one embodiment, the preset value is less than or equal to 50%.

[0023] A control method for an electric tool, comprising:

[0024] Detecting the current position of the mode switch;

[0025] According to the current position of the mode switching member, the duty cycle of the motor corresponding to the minimum stroke of the trigger switch is adjusted.

[0026] In one embodiment, the step of adjusting the duty cycle of the motor corresponding to the minimum stroke of the trigger switch according to the current position of the mode switching member includes:

[0027] Determining the mode of the electric tool according to the current position of the mode switching member;

[0028] When it is determined that the electric tool is in the impact mode, the duty cycle of the motor corresponding to the minimum stroke of the trigger switch is adjusted to a preset value greater than zero.

[0029] In one embodiment, the preset value is 50%.

[0030] In one embodiment, before the step of detecting the current position of the mode switching member, the method further includes:

[0031] A mapping relationship between the position of the mode switching member and the mode of the electric tool is determined and stored.

[0032] The electric tool provided by the present application can adjust the working mode of the electric tool by adjusting the position of the mode switching member. Specifically, when the mode switching member is in the first position, the electric tool is in the impact mode, and when the mode switching member is in the second position, the electric tool is in the non-impact mode. The detection member can detect the current position of the mode switching member and send it to the controller. When the controller determines that the mode switching member is in the first position, that is, when the electric tool is in the impact mode, the motor duty cycle corresponding to the minimum stroke of the trigger switch is adjusted to a preset value greater than zero. The motor duty cycle increases, that is, the motor speed increases, the power increases, and the torque increases, so that when the electric tool is in the impact mode, the motor can also provide sufficient driving force to form an impact on the main shaft along the main shaft axis when the trigger stroke is small, so as to achieve rapid hammer start and improve the working efficiency of the electric tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of an electric tool provided in Embodiment 1 of the present invention;

[0034] Figure 2 A schematic structural diagram of a guide member in an electric tool provided in Embodiment 1 of the present invention;

[0035] Figure 3 A schematic diagram of the structure of an impact switching component in an electric tool provided in Embodiment 1 of the present invention;

[0036] Figure 4 A schematic diagram of the structure of the electric tool provided in the first embodiment of the present invention when the impact switching member and the guide member are separated;

[0037] Figure 5 A schematic diagram of the positional relationship between the first detection element and the second detection element when the mode switching member in the electric tool provided in the first embodiment of the present invention is in the first position;

[0038] Figure 6 A schematic diagram of the positional relationship between the first detection element and the second detection element when the mode switching member in the electric tool provided in the first embodiment of the present invention is in the second position;

[0039] Figure 7 This is a relationship diagram between the trigger switch travel amount and the motor duty cycle of the electric tool provided in the first embodiment of the present invention.

[0040] Reference numerals:

[0041] 10-housing; 101-second groove;

[0042] 20-motor;

[0043] 30-impact mechanism; 301-hammer; 302-guide member; 3021-second fixed tooth; 303-energy storage element; 304-first guide member; 305-second guide member;

[0044] 40-spindle;

[0045] 50-mode switching member; 501-first groove;

[0046] 60-detection element; 601-first detection element; 602-second detection element;

[0047] 70-controller;

[0048] 80-transmission mechanism;

[0049] 90-impact switching member; 901-first fixed tooth;

[0050] 100-tool head;

[0051] 200-battery;

[0052] 300 - Trigger switch. DETAILED DESCRIPTION

[0053] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to understand the disclosure of the present invention more thoroughly and comprehensively.

[0054] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected" to another element or one element is "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time, and it should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] The terms "vertical", "horizontal", "left", "right", "up", "down", "front", "rear", "circumferential" and similar expressions used in this document are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0056] Furthermore, the terms “first”, “second”, and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0058] Embodiment 1

[0059] An embodiment of the present invention provides an electric tool having an impact mode and a non-impact mode, such as Figure 1As shown, it includes a housing 10, a trigger switch 300, a spindle 40 disposed inside the housing 10, the end of which is used to mount the tool head 100, a motor 20 disposed inside the housing 10 for providing driving force, and an impact mechanism 30 driven by the motor 20. The impact mechanism 30 can use the driving force of the motor 20 to form an impact on the spindle 40 along the spindle axis in the impact mode, so that the spindle 40 can drive the tool head 100 to reciprocate. It also includes a mode switching member 50 that can be operated to move between a first position and a second position. When the mode switching member 50 is in the first position, the power tool is in the impact mode, and when the mode switching member 50 is in the second position, the power tool is in the non-impact mode. In addition, the electric tool also includes a detection member 60 for detecting the current position of the mode switching member 50 and a controller 70. The controller 70 is electrically connected to the detection member 60, the trigger switch 300, and the motor 20, respectively, and is used to control the duty cycle of the motor 20 according to the stroke of the trigger switch 300. In this embodiment, the controller 70 is also used to adjust the duty cycle of the motor 20 corresponding to the minimum stroke of the trigger switch to a preset value greater than zero when it is determined that the current position of the mode switching member 50 detected by the detection member 60 is the first position, that is, when the electric tool is in the impact mode.

[0060] The spindle 40 is used to receive the tool head 100 and has a central axis X. In the impact mode, the spindle 40 reciprocates along its central axis X. In the non-impact mode, the spindle 40 cannot reciprocate along its central axis X. The mode switching member 50 is used to switch the power tool between the impact mode and the non-impact mode.

[0061] like Figure 1 and Figure 2 As shown, the impact mechanism 30 includes a hammer 301, a guide 302, and an energy storage element 303 abutting against the hammer 301. The hammer 301 is provided with a first guide 304, and the guide 302 is provided with a second guide 305. In the impact mode, the hammer 301 rotates relative to the guide 302, so that the first guide 304 can drive the hammer 301 to overcome the force of the energy storage element 303 and move along the central axis X toward the second axial direction A through the second guide 305, and the energy storage element 303 can drive the hammer 301 to move along the central axis X toward the first axial direction B opposite to the second axial direction A to impact the main shaft 40; in the non-impact mode, the hammer 301 and the guide 302 do not rotate relative to each other. Figure 1 In the illustrated embodiment, the second axial direction A is horizontally to the left, and the first axial direction B is horizontally to the right.

[0062] As an optional implementation, the electric tool provided in this embodiment further includes a transmission mechanism 80, which is used to transmit the driving force of the motor 20 to at least one of the hammer 301 and the guide member 302. The mode switching member 50 is operable to switch between a first position and a second position. When the mode switching member 50 is in the first position, the hammer 301 can rotate relative to the guide member 302, that is, there is relative rotation between the two, and the electric tool is in an impact mode; when the mode switching member 50 is in the second position, the guide member 302 can be driven to rotate by the motor 20, but the hammer 301 and the guide member 302 do not rotate relative to each other, and the electric tool is in a non-impact mode.

[0063] In this embodiment, Figure 1 , Figure 3 as well as Figure 4 As shown, an impact switching member 90 is also included. The mode switching member 50 can be operated to move between a first position and a second position. In practice, the engagement or separation of the impact switching member 90 and the guide member 302 is achieved by position switching of the mode switching member 50 . Specifically, when the mode switching member 50 is in the first position, the impact switching member 90 is engaged with the guide member 302, and the guide member 302 is fixed relative to the shell 10. At this time, driven by the motor 20, the hammer 301 rotates relative to the guide member 302, so that the first guide member can drive the hammer 301 through the second guide member to overcome the force of the energy storage element 303 and move along the center axis X toward the second axial direction A. The energy storage element 303 can drive the hammer 301 along the center axis X toward the first axial direction B opposite to the second axial direction A to impact the spindle 40, and the power tool enters the impact mode; when the mode switching member 50 moves to the second position, the impact switching member 90 is separated from the guide member 302, the guide member 302 can rotate relative to the shell 10, the hammer 301 and the guide member 302 have no relative rotation, and the power tool enters the non-impact mode.

[0064] In this embodiment, the mode switching member 50 is rotatably arranged relative to the housing 10, and drives the impact switching member 90 to move axially by rotating. In this way, the operating space of the mode switching member 50 can be reduced. In this way, when switching between the second position and the first position, the mode switching member 50 realizes position switching by rotating a certain angle. Of course, as an alternative embodiment, the mode switching member 50 can also move axially relative to the housing 10 to change its position, thereby driving the impact switching member 90 to move axially.

[0065] The impact switching member 90 is provided with a first fixed tooth 901, and the guide member 302 is provided with a second fixed tooth 3021. The mode switching member 50 rotates relative to the housing 10 and drives the impact switching member 90 to move along the centerline axis X so that the first fixed tooth 901 is engaged with or separated from the second fixed tooth 3021. When the first fixed tooth 901 is engaged with the second fixed tooth 3021, the impact switching member 90 can limit the movement of the guide member 302, the guide member 302 is fixed relative to the housing 10, and the power tool enters the impact mode. When the first fixed tooth 901 is separated from the second fixed tooth 3021, the guide member 302 can rotate relative to the housing 10, and the power tool enters the non-impact mode.

[0066] As an optional implementation, Figure 1 , Figure 5 as well as Figure 6 As shown, the detection member 60 includes a first detection element 601 and a second detection element 602, one of which is fixed to the mode switching member 50, and the other is fixed to the housing 10. When the mode switching member 50 is in the first position, the second detection element 602 falls within the detection range of the first detection element 601, and when the mode switching member 50 is in the second position, the second detection element 602 does not fall within the detection range of the first detection element 601. Among them, the first detection element 601 is used to detect the second detection element 602, and has a certain detection range. When the rotating mode switching member 50 is at the first position, the second detection element 602 falls within the detection range of the first detection element 601, and when the rotating mode switching member 50 is at the second position, the second detection element 602 does not fall within the detection range of the first detection element 601.

[0067] In this embodiment, the mode switching member 50 and the housing 10 are generally in a sleeve position relationship, and at least part of them are directly opposite to each other. The mode switching member 50 can be sleeved on the outside of the housing 10, and the housing 10 can also be sleeved on the outside of the mode switching member 50. In the case where the housing 10 is sleeved on the outside of the mode switching member 50, at least part of the structure of the mode switching member 50 is exposed to the outside for rotation by the user, that is, the housing 10 is sleeved on a part of the mode switching member 50. In addition, when the mode switching member 50 is rotated, the housing 10 is fixed.

[0068] As an optional embodiment, the shell 10 is mounted on the outside of the mode switching member 50, the outer wall of the mode switching member 50 is provided with a first groove 501, the inner wall of the shell 10 is provided with a second groove 101, one of the first detection element 601 and the second detection element 602 is fixed in the first groove 501, and the other of the two is fixed in the second groove 101.

[0069] Assuming that the first detection element 601 is fixed in the first groove 501, and the second detection element 602 falls into the second groove 101, during the process of rotating the mode switching member 50 to the first position, the first groove 501 gradually approaches the second groove 101, thereby making the first detection element 601 in the first groove 501 gradually approach the second detection element 602 in the second groove 101, and when the mode switching member 50 is in the first position, the second detection element 602 in the second groove 101 falls into the detection range of the first detection element 601 in the first groove 501. During the process of rotating the mode switching member 50 to the second position, the first groove 501 gradually moves away from the second groove 101, and when the mode switching member 50 is in the second position, the second detection element 602 in the second groove 101 does not fall into the detection range of the first detection element 601 in the first groove 501.

[0070] Similarly, when the first detection element 601 is fixed in the second groove 101 and the second detection element 602 is fixed in the first groove 501, when the mode switching member 50 is in the first position, the second detection element 602 in the first groove 501 falls into the detection range of the first detection element 601 in the second groove 101. When the mode switching member 50 is rotated to the second position, the first groove 501 gradually moves away from the second groove 101. When the mode switching member 50 is in the second position, the second detection element 602 in the first groove 501 does not fall into the detection range of the first detection element 601 in the second groove 101.

[0071] Of course, the first detection element 601 and the second detection element 602 may be fixed to the mode switching member 50 or the housing 10 in other ways, and are not limited to the way of setting the grooves.

[0072] As an optional implementation, the first detection element 601 is a Hall sensor, and the second detection element 602 is a magnet. The Hall sensor is a magnetic field sensor made based on the Hall effect, and the electrical parameters (such as voltage) output by it will change with the change of the magnetic field strength. When the mode switching element 50 is in the first position, the magnetic field strength sensed by the Hall sensor is different from the magnetic field strength sensed by the Hall sensor when the mode switching element 50 is in the second position, so the output electrical parameters are also different, and the position of the mode switching element 50 is detected accordingly.

[0073] As a variation, the first detection element 601 may be a proximity sensor, and the second detection element 602 may be a magnet. The principle of the proximity sensor is similar to that of the Hall sensor, and will not be described in detail here.

[0074] As another variation, the first detection element 601 is an optical sensor, and the second detection element 602 is an optical identification code. The optical sensor may be a laser sensor, and the optical identification code may be a plurality of concave-convex structures arranged at intervals. When the mode switching member 50 is in the first position, the laser emitted by the laser sensor can irradiate the concave-convex structure. Since the distances from the laser to the convex surface and the concave surface are different, the distance signal reflected by the optical identification code received at the laser sensor has relatively regular differences, thereby detecting the optical identification code. When the mode switching member 50 is in the second position, the reflected signal received by the laser sensor does not have the above-mentioned characteristics, and the position of the mode switching member 50 is detected accordingly.

[0075] It should be noted that the structure of the optical identification code can be various, such as setting blocks with black and white alternations, or setting the surface of one of two adjacent blocks as an inclined surface, which can affect the signal received by the laser sensor.

[0076] It should also be noted that the first detection element 601 and the second detection element 602 are not limited to the above-mentioned embodiments, and other elements that can achieve the same function are applicable to the present application.

[0077] The following describes the starting process of the power tool:

[0078] Rotate the mode switching member 50 to the desired position, press the trigger switch 300, connect the controller 70 to the battery 200, power on the controller 70, and supply power to the motor 20. The detection member 60 detects the position of the mode switching member 50 and sends the position information to the controller 70. The controller 70 judges the position information. When the mode switching member 50 is in the first position, that is, the power tool is in the impact mode, the controller 70 sends a control signal to the motor 20 to adjust the initial duty cycle of the motor 20 (that is, the motor duty cycle corresponding to the minimum stroke of the trigger switch, hereinafter referred to as the initial duty cycle) to a preset value greater than zero, and the motor 20 starts.

[0079] As an optional implementation, the preset value is less than or equal to 50%. Further preferably, the preset value is set to 50%. When the initial duty cycle of the motor is set to 50%, while ensuring that the motor can provide sufficient driving force to drive the spindle to reciprocate, it can also ensure that the driving force of the motor will not damage the load.

[0080] like Figure 7 As shown, in actual applications, the travel amount of the trigger switch 300 and the duty cycle of the motor 20 are generally linearly related. As the travel amount of the trigger switch 300 increases, the duty cycle of the motor 20 increases linearly. Figure 7In the example, taking the preset value of 50% as an example, when the electric tool is in the impact mode, the duty cycle of the motor 20 corresponding to the minimum stroke of the trigger switch 300 is 50%, and when the stroke increases from 0 to L, the duty cycle of the motor 20 increases linearly from 50% to 100%. When the electric tool is in the non-impact mode, the duty cycle of the motor 20 corresponding to the minimum stroke of the trigger switch 300 is 0, and when the stroke increases from 0 to L, the duty cycle of the motor 20 increases linearly from 0 to 100%.

[0081] It should be noted that the relationship between the trigger switch travel and the motor duty cycle can also be nonlinear, which can be set according to actual needs and is not limited here.

[0082] Of course, the initial duty cycle of the motor 20 can also be adjusted to be greater than 50%, such as 60%, 65%, 70%, etc., and the preset value can be set according to actual needs. The duty cycle of the motor 20 increases, that is, the speed of the motor 20 increases, the power increases, and the torque becomes larger, so that when the power tool is in the impact mode, the motor 20 can also provide sufficient driving force to form an impact on the main shaft 40 along the axial direction of the main shaft 40 when the stroke of the trigger switch 300 is small, so as to achieve rapid hammer start and improve the working efficiency of the power tool.

[0083] Embodiment 2

[0084] An embodiment of the present invention provides a control method for the electric tool provided in Embodiment 1, comprising the following steps:

[0085] Step S21, detecting the current position of the mode switching member 50. Specifically, the current position of the mode switching member 50 is detected by the detection member 60. The specific detection method can refer to the relevant description in the first embodiment, which will not be repeated here.

[0086] Step S22 : adjusting the duty cycle of the motor 20 corresponding to the minimum stroke of the trigger switch 300 according to the current position of the mode switching member 50 .

[0087] Specifically, step S22 includes:

[0088] Step S220: Determine the mode of the power tool according to the current position of the mode switching member 50. The position of the mode switching member 50 may include a first position and a second position. When the mode switching member 50 is in the first position, the power tool is in the impact mode. When the mode switching member 50 is in the second position, the power tool is in the non-impact mode.

[0089] Step S221: When it is determined that the electric tool is in the impact mode, the duty cycle of the motor corresponding to the minimum stroke of the trigger switch is adjusted to a preset value greater than zero. The preset value can be set to be greater than 0, less than or equal to 50%, preferably 50%. The preset value can be set according to actual needs so that the motor 20 can provide sufficient driving force to form an impact on the main shaft 40 along the axial direction of the main shaft 40 to achieve rapid hammering.

[0090] When it is determined that the power tool is in the non-impact mode, the initial duty cycle of the motor 20 is not adjusted.

[0091] As an optional implementation, before step S21, the following steps are further included:

[0092] Step S20, determine and store the mapping relationship between the position of the mode switching member 50 and the mode of the power tool. Thus, when the controller 70 obtains the position information of the mode switching member 50, it can quickly determine the current mode according to the stored mapping relationship between the position of the mode switching member 50 and the mode of the power tool, and then quickly adjust the initial duty cycle of the motor 20 when in the impact mode to improve the starting efficiency of the power tool.

[0093] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An electric tool, characterized in that: include: case; Trigger switch; A spindle is disposed in the housing and has a tool head mounted on its end; A motor, disposed in the housing, for providing a driving force; An impact mechanism, capable of using the driving force of the motor to drive the spindle to reciprocate along the axial direction of the spindle in the impact mode; A mode switching member, operable to move between a first position and a second position, wherein when the mode switching member is in the first position, the power tool is in an impact mode, and when the mode switching member is in the second position, the power tool is in a non-impact mode; A detection member, used for detecting a current position of the mode switching member; A controller, electrically connected to the detection member, the trigger switch, and the motor, respectively, and controlling the duty cycle of the motor according to the stroke of the trigger switch; The controller is also used to adjust the motor duty cycle corresponding to the minimum stroke of the trigger switch to a preset value greater than zero when it is determined that the current position of the mode switching member detected by the detection member is the first position; When the trigger switch is pressed, based on the adjusted motor duty cycle, the motor provides driving force for the impact mechanism, forming an impact on the spindle along the axis of the spindle to start the hammer.

2. The electric tool according to claim 1, characterized in that: The detection member includes a first detection element and a second detection element, one of the first detection element and the second detection element is fixed to the mode switching member, and the other of the first detection element and the second detection element is fixed to the shell. When the mode switching member is in the first position, the second detection element falls within the detection range of the first detection element, and when the mode switching member is in the second position, the second detection element does not fall within the detection range of the first detection element.

3. The electric tool according to claim 2, characterized in that: The shell is sleeved on the outside of the mode switching member, the outer wall of the mode switching member is provided with a first groove, the inner wall of the shell is provided with a second groove, one of the first detection element and the second detection element is fixed in the first groove, and the other of the two is fixed in the second groove.

4. The electric tool according to claim 2, characterized in that: The first detection element is a Hall sensor, and the second detection element is a magnet.

5. The electric tool according to claim 2, characterized in that: The first detection element is a proximity sensor, and the second detection element is a magnet.

6. The electric tool according to claim 2, characterized in that: The first detection element is an optical sensor, and the second detection element is an optical identification code.

7. The electric tool according to claim 6, characterized in that: The optical sensor is a laser sensor, and the optical identification code is a plurality of concave-convex structures arranged at intervals.

8. The electric tool according to claim 1, characterized in that: The preset value is less than or equal to 50%.

9. A control method for an electric tool according to any one of claims 1 to 8, characterized in that: include: Detecting the current position of the mode switch; According to the current position of the mode switching member, the duty cycle of the motor corresponding to the minimum stroke of the trigger switch is adjusted.

10. The control method of the electric tool according to claim 9, characterized in that: The step of adjusting the duty cycle of the motor corresponding to the minimum stroke of the trigger switch according to the current position of the mode switching member includes: Determining the mode of the electric tool according to the current position of the mode switching member; When it is determined that the electric tool is in the impact mode, the duty cycle of the motor corresponding to the minimum stroke of the trigger switch is adjusted to a preset value greater than zero.

11. The control method of the electric tool according to claim 10, characterized in that: The preset value is 50%.

12. The control method of the electric tool according to claim 10, characterized in that: Before the step of detecting the current position of the mode switching element, the method further includes: A mapping relationship between the position of the mode switching member and the mode of the electric tool is determined and stored.

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