Electric tool and control method thereof

Abstract

The invention provides an electric tool and a control method thereof. According to the electric tool control method, the motor is controlled to rotate according to the position of the reversing device and the stroke of the trigger after the stroke of the trigger is obtained, for example, the motor is controlled to rotate reversely when the reversing device is located at the reverse working position and the stroke of the trigger reaches the working stroke of the motor, and the safety requirement of electric equipment is met; and when the reversing device is in the forward rotation working position and the trigger stroke reaches the trigger triggering stroke, the motor is controlled to rotate forward, so that the stroke utilization rate of the trigger and the sensitivity of the electric tool are improved.

Description

Technical Field

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

[0002] At present, the reversing device of a handheld power tool usually includes three gears: forward, self-locking and reverse. The user can switch the gears by turning the reversing device to the left, middle or right, and control the working speed of the device by the trigger.

[0003] In addition, in actual applications, a certain shielding process is usually set to prevent users from accidentally touching the trigger to avoid construction hazards. However, this method will reduce the travel utilization of the trigger and the sensitivity of the power tool. Summary of the invention

[0004] In view of the above, the present application provides an electric tool and a control method thereof, which are used to solve the problems of low sensitivity and low stroke utilization of the electric tool.

[0005] The first aspect of the present application provides a method for controlling an electric tool, wherein the electric tool includes a reversing device and a trigger, wherein the position of the reversing device includes a forward working position and a reverse working position. The method for controlling the electric tool includes: obtaining a trigger stroke. When the reversing device is in the reverse working position and the trigger stroke reaches the motor working stroke, the motor reverses. When the reversing device is in the forward working position and the trigger stroke reaches the trigger trigger stroke, the motor rotates forward.

[0006] As an optional implementation, the obtaining of the trigger stroke includes: obtaining a real-time voltage of the trigger, and determining the trigger stroke according to the real-time voltage.

[0007] As an optional implementation, when the reversing device is in the reverse working position and the trigger stroke reaches the motor working stroke, the step of reversing the motor further includes: determining whether the real-time voltage is greater than the reverse stroke shielding voltage. When the real-time voltage is greater than the reverse stroke shielding voltage, the motor is controlled to reverse according to the real-time voltage.

[0008] As an optional implementation, controlling the motor to reverse according to the real-time voltage includes: obtaining a first functional relationship between the trigger stroke and the motor speed, determining the motor reverse speed according to the first functional relationship and the real-time voltage, and controlling the motor to reverse according to the reverse speed.

[0009] As an optional implementation, the electric tool control method further includes: when the reversing device is in a self-locking position, controlling the motor to stop working.

[0010] As an optional implementation, controlling the motor to stop working includes: determining whether the real-time voltage is greater than a voltage safety threshold. If the real-time voltage is less than or equal to the voltage safety threshold, obtaining a shutdown control signal. Controlling the motor to stop working according to the shutdown control signal.

[0011] As an optional implementation, the working stroke of the motor is no greater than 1 / 3 of the total trigger stroke of the trigger.

[0012] As an optional implementation, when the reversing device is in the forward working position and the trigger stroke reaches the trigger trigger stroke, the motor rotates forward, including: the motor rotates forward when the real-time voltage is greater than zero. The forward speed of the motor is determined according to the real-time voltage. The motor is controlled to rotate forward according to the forward speed.

[0013] The second aspect of the present application further provides an electric tool, the electric tool comprising a reversing device and a trigger, the position of the reversing device comprising a forward working position and a reverse working position; the electric tool further comprises: a collection unit for acquiring the trigger stroke. A first control unit for controlling the motor to reverse when the reversing device is in the reverse working position and the trigger stroke reaches the motor working stroke. A second control unit for controlling the motor to forward when the reversing device is in the forward working position and the trigger stroke reaches the trigger trigger stroke.

[0014] As an optional implementation, the working stroke of the motor is no more than 1 / 3 of the total trigger stroke of the trigger.

[0015] The electric tool and control method thereof of the present application, after obtaining the trigger stroke, controls the rotation of the motor according to the position of the reversing device and the trigger stroke. For example, when the reversing device is in the reverse working position and the trigger stroke reaches the motor working stroke, the motor is controlled to reverse, thereby meeting the safety requirements of the electric equipment; and when the reversing device is in the forward working position and the trigger stroke reaches the trigger trigger stroke, the motor is controlled to rotate forward, thereby improving the trigger stroke utilization rate and the sensitivity of the electric tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an electric tool provided in an embodiment of the present application.

[0017] Figure 2 This is a circuit diagram of an electric tool provided in an embodiment of the present application.

[0018] Figure 3 It is a specific circuit diagram of the reversing device and trigger provided in the embodiment of the present application.

[0019] Figure 4 It is a comparison chart of the trigger travel and the resistance value of the sliding rheostat provided in the embodiment of the present application.

[0020] Figure 5 It is a flow chart of a power tool control method provided in an embodiment of the present application.

[0021] Figure 6 This is another flow chart of a power tool control method provided in an embodiment of the present application.

[0022] Figure 7 This is another flow chart of a power tool control method provided in an embodiment of the present application.

[0023] Figure 8 It is a specific circuit diagram of the reversing device and trigger provided in the embodiment of the present application.

[0024] Fig. 9 This is another flow chart of a power tool control method provided in an embodiment of the present application.

[0025] Fig.10 This is another flow chart of a power tool control method provided in an embodiment of the present application.

[0026] Fig.11 It is a schematic diagram of partially shielding the speed regulation stage provided in an embodiment of the present application.

[0027] Fig.12 This is another flow chart of a power tool control method provided in an embodiment of the present application.

[0028] Fig.13 It is a schematic diagram of an electric tool control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solution of the present application is further described in detail below through the accompanying drawings and embodiments.

[0030] In the embodiments of the present application, the words "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. For example, the first application, the second application, etc. are used to distinguish different applications, rather than to describe a specific order of applications. The features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0031] The present application provides a method for controlling an electric tool. In practical applications, the electric tool may be an electric drill, an electric hammer, an electric wrench, an electric saw, etc. The electric tool may be as follows: Figure 1 As shown, a reversing device 50 and a trigger 60 are included.

[0032] Optional, such as Figure 2As shown, the electric tool may include a microcontroller 10, a motor 20, a drive module 21, a detection storage unit 30, a voltage detection unit 40, a reversing device 50, a trigger 60, a power module 70, a voice prompt unit 80, and a display 90; wherein:

[0033] The driving module 21 is connected to the microcontroller 10, and is used to drive the motor 20 to work under the control of the microcontroller 10. The driving module 21 includes an upper bridge arm and a lower bridge arm, the upper bridge arm includes switch K1 tubes Q1, Q2, Q3, and the lower bridge arm includes switch K1 tubes Q4, Q5, Q6, and each switch K1 tube is respectively connected in reverse parallel with diodes D1 to D6; optionally, the motor 20 is a brushless motor 20 or a brushed motor 20.

[0034] The detection storage unit 30 and the voltage detection unit 40 are both connected to the microcontroller 10 . The detection storage unit 30 is used to detect the position of the reversing device 50 , and the voltage detection unit 40 is used to detect the real-time voltage of the trigger 60 .

[0035] The power module 70 is used to obtain power from the battery (BTA) and provide an operating voltage VDD to the microcontroller unit 10, the power module 70, the voice prompt unit 80, the display 90, the detection storage unit 30, the voltage detection unit 40, etc. In practical applications, the operating voltage VDD may be 5V.

[0036] The voice prompt unit 80 and the display 90 are both connected to the microcontroller 10. The microcontroller 10 can control the voice prompt unit 80 to prompt the user of the current working state of the power tool, and the user can also observe the working state of the power tool through the display 90.

[0037] In practical applications, the reversing device 50 includes a reversing switch and a reversing circuit, and the reversing switch includes but is not limited to a knob, a lever, a button, a touch screen, etc.; the specific circuit diagram of the reversing device 50 and the trigger 60 can be as shown in FIG. Figure 3 As shown, the reversing device 50 is used to control the working state of the motor 20. Specifically, the working state of the motor 20 includes two working states: forward and reverse. When the reversing device 50 is connected to the terminal 3, the reversing device 50 is in the forward working position, and the motor 20 rotates forward. On the contrary, when the reversing device 50 is suspended, the reversing device 50 is in the reverse working position, and the motor 20 reverses. In practical applications, the trigger 60 is used to control the start and stop and speed regulation of the motor 20, specifically including the on state and the speed regulation state. Figure 3For example, the trigger 60 can be composed of a push rod D1, a switch K1 and a sliding rheostat R1. When the push rod D1 moves in the direction of the arrow and reaches the process where the switch K1 is located, the switch K1 is closed, and the motor 20 is started. As the push rod D1 moves, the resistance between the terminal 6 and the terminal 2 changes, thereby changing the speed of the motor 20. In actual applications, it is not limited to this, and it can be determined according to the specific application environment, which is within the protection scope of this application.

[0038] For details, see Figure 4 , is a comparison chart of the trigger stroke and the resistance of the sliding rheostat R1. The broken line 6-2 is a broken line chart of the trigger stroke and the resistance between the terminal 1 during the process of pressing the trigger 60, and the broken line 6-1 is a broken line chart of the trigger stroke and the resistance of the sliding rheostat R1 during the process of pressing the trigger 60. Take curve S1 as an example for introduction. In the initial state, the push rod D1 is not pressed and its stroke is zero. The corresponding resistance between terminal 6 and terminal 2 is 9.5kΩ. As the push rod D1 is pressed and reaches 1.5±0.3mm, the switch K1 is turned on, and the motor 20 is in working state. The push rod D1 continues to be pushed. When the push rod D1 reaches 2.5±0.4mm, the microcontroller 10 controls the rotation of the motor 20 and controls the rotation speed of the motor 20 according to the resistance between terminal 6 and terminal 2. When the moving distance of the push rod D1 is greater than or equal to 6.5±0.4mm, the speed of the motor 20 is the maximum speed. Optionally, the total stroke of the push rod D1 can be 8±0.3mm, and the broken line in the comparison diagram of the stroke of the sliding rheostat R1 and the resistance of the trigger 60 can be a step curve or a linear curve. Here, only the step curve is used as an example for display. In actual applications, it is not limited to this. It depends on the specific application environment and is within the protection scope of this application.

[0039] Existing power tools usually have a certain shielding process to prevent users from accidentally touching the trigger 60 and causing construction hazards, but this method will reduce the travel utilization rate of the trigger 60 and the sensitivity of the power tool. To this end, the present application provides a power tool control method to improve the travel utilization rate of the trigger 60 and the sensitivity of the power tool. Figure 5 , the method comprising:

[0040] S10, obtaining the trigger travel.

[0041] After acquiring the trigger stroke, the microcontroller 10 controls the motor according to the trigger stroke and the position of the reversing device 50 .

[0042] In practical applications, the microcontroller 10 controls the detection storage unit 30 to detect the position of the reversing device 50 and determine the working position of the reversing device 50. Specifically, when the reversing device 50 is connected to the wiring terminal 3, it means that the reversing device 50 is in the forward working position, and vice versa, when the reversing device 50 is suspended, it means that the reversing device 50 is in the reverse working position.

[0043] S20: When the reversing device is in the reverse working position and the trigger stroke reaches the motor working stroke, the motor reverses.

[0044] When the reversing device 50 is suspended in the air, the reversing device 50 is in the reversing working position, and the microcontroller 10 controls the motor 20 to reverse when the trigger stroke reaches the motor working stroke.

[0045] In actual applications, the working stroke of the motor is not greater than 1 / 3 of the total trigger stroke of the trigger 60. The working stroke of the motor includes but is not limited to 1 / 10, 1 / 8, 1 / 6, 1 / 5, 1 / 4, etc., which is not specifically limited here and depends on the actual application environment. It is within the protection scope of this application.

[0046] S30: When the reversing device is in the forward rotation working position and the trigger stroke reaches the trigger trigger stroke, the motor rotates forward.

[0047] When the reversing device 50 is connected to the connecting terminal 3, the reversing device 50 is in the forward rotation working position, and the microcontroller 10 controls the motor 20 to rotate forward when the trigger stroke reaches the trigger trigger stroke.

[0048] The trigger trigger stroke is not greater than 1 / 10 of the total trigger stroke of the trigger 60. Preferably, the trigger trigger stroke approaches 0. Ideally, the trigger trigger stroke is 0.

[0049] The electric tool control method provided in this embodiment meets the safety requirements of electric equipment by controlling the motor 20 to reverse when the reversing device 50 is in the reverse working position and the trigger stroke reaches the motor working stroke; and controls the motor 20 to rotate forward when the reversing device 50 is in the forward working position and the trigger stroke reaches the trigger trigger stroke, thereby improving the stroke utilization rate of the trigger 60 and the sensitivity of the electric tool.

[0050] On the basis of the previous embodiment, optionally, S10 can be as follows Figure 6 Shown include:

[0051] S21, obtaining the real-time voltage of the trigger, and determining the trigger travel according to the real-time voltage.

[0052] See also Figure 2In actual application, as the trigger 60 is pressed, the trigger travel changes, and the resistance value of the sliding rheostat R1 in the trigger 60 also changes accordingly, thereby causing the real-time voltage of the trigger 60 to change accordingly. Therefore, the microcontroller 10 can obtain the real-time voltage of the trigger 60 through the voltage detection unit 40 to obtain the trigger travel.

[0053] The electric tool control method provided in this embodiment obtains the real-time voltage of the trigger 60 to determine the trigger stroke according to the real-time voltage. After obtaining the trigger stroke, the microcontroller 10 can control the rotation of the motor 20 according to the position of the reversing device 50 and the trigger stroke to meet the safety requirements of the electric equipment and improve the stroke utilization rate of the trigger 60 and the sensitivity of the electric tool.

[0054] On the basis of the previous embodiment, when the trigger travel is the real-time voltage of the trigger, step S20 can be as follows: Figure 6 As shown, including:

[0055] S31, judging whether the real-time voltage is greater than the reverse stroke shielding voltage.

[0056] In actual applications, the reverse stroke shielding voltage of the motor 20 is pre-stored in the microcontroller 10. The value of the reverse stroke shielding voltage is not specifically limited here, and it can be determined according to the actual application environment, which is within the protection scope of the present application; and in actual applications, when the real-time voltage of the trigger 60 is greater than the reverse stroke shielding voltage, the trigger stroke of the trigger 60 reaches the motor working stroke. At this time, the rotation speed of the motor 20 is positively correlated with the trigger stroke, that is, the rotation speed of the motor 20 increases with the increase of the trigger stroke; when the real-time voltage of the trigger 60 is less than or equal to the reverse stroke shielding voltage, the trigger stroke of the trigger 60 is in the motor reverse shielding stroke.

[0057] If the reversing device 50 is suspended, the reversing device 50 is in the reverse working gear, the detection storage unit 30 outputs a low-level signal to the microcontroller 10, and the voltage detection unit 40 outputs the real-time voltage of the trigger 60, so that the microcontroller 10 can control the reversal of the motor 20 according to the reverse stroke shielding voltage and the real-time voltage of the motor 20.

[0058] Specifically, when the real-time voltage of the trigger 60 is greater than the reverse stroke shielding voltage, the microcontroller 10 executes step S32; when the real-time voltage of the trigger 60 is less than or equal to the reverse stroke shielding voltage, the microcontroller 10 continues to execute step S31.

[0059] S32, controlling the motor to reverse according to the real-time voltage.

[0060] The electric tool control method provided in this embodiment meets the safety requirements of electric equipment and improves the safety and reliability of the electric tool by controlling the motor 20 to reverse according to the reverse stroke shielding voltage of the motor 20 and the real-time voltage of the trigger 60 in the control loop when the reversing device 50 is in the reverse working gear.

[0061] Based on the above embodiment, step S32 can be as follows: Figure 7 As shown, including:

[0062] S41, obtaining a first functional relationship between the trigger stroke and the motor speed.

[0063] Optionally, the first functional relationship may be a linear functional relationship or a nonlinear functional relationship. In practical applications, the first functional relationship between the stroke of the trigger 60 and the speed of the motor 20 may be obtained by referring to the product description or product parameter table of the switch K1, and the first functional relationship may be a data table, a relationship curve or a calculation formula, which is not specifically limited here and may be determined according to the actual application environment, and all are within the protection scope of this application.

[0064] S42, determining the reverse speed of the motor according to the first functional relationship and the real-time voltage.

[0065] Optional, such as Figure 3 As shown, the resistance of the trigger 60 changes linearly with the stroke of the push rod D1, so the real-time voltage of the trigger 60 output by the voltage detection unit 40 will also change with the stroke of the trigger 60, and then the microcontroller 10 can determine the reverse speed of the motor 20 according to the first functional relationship.

[0066] S43, controlling the motor to reverse according to the reverse speed.

[0067] After determining the reverse rotation speed of the motor 20 , the microcontroller 10 drives the motor 20 to reverse rotation through the driving module 21 .

[0068] The electric tool control method provided in this embodiment obtains a first functional relationship between the stroke of the trigger 60 and the speed of the motor 20 when the reversing device 50 is in the reverse working position and the real-time voltage of the trigger 60 is greater than the reverse stroke shielding voltage, so as to determine the reverse speed of the motor 20 based on the first functional relationship and the real-time voltage, and then control the motor 20 to reverse according to the reverse speed, thereby meeting the safety requirements of electric equipment and improving the safety and reliability of the electric tool.

[0069] On the basis of the above embodiment, the reversing device 50 may also be as follows Figure 8As shown. The reversing device 50 includes three positions, namely the left side, the middle and the right side, which are respectively recorded as the first position, the second position and the third position. When the reversing device 50 is in the first position, the motor 20 is in the forward working state. When the reversing device 50 is in the second position, the motor 20 is in the self-locking state. When the reversing device 50 is in the third position, the motor 20 is in the reverse working state. The detection storage unit 30 can detect the first position, the second position and the third position.

[0070] On this basis, optionally, see Fig. 9 , the electric tool control method further includes:

[0071] S51. When the reversing device is in the self-locking position, the control motor stops working.

[0072] When the microcontroller 10 detects that the reversing device 50 is in the self-locking position, the drive module 21 controls the motor 20 to stop working.

[0073] In actual applications, the microcontroller 10 pre-stores the code corresponding to the position of the reversing device 50. After detecting the position of the reversing device 50, the detection storage unit 30 outputs the corresponding code to the microcontroller 10, so that the microcontroller 10 can determine the working gear of the reversing device 50 based on the received code and the pre-stored code inside it.

[0074] The electric tool control method provided in this embodiment controls the motor 20 to stop working when the reversing device 50 is in the self-locking position, thereby avoiding the electric tool from being started due to accidental touch, thereby improving the safety performance of the electric tool. Moreover, it is only controlled by software, and there is no need to add or change mechanical structures, components and other hardware, thereby reducing implementation costs, enhancing the versatility of the design, and saving space for the electric tool.

[0075] On the basis of the above embodiment, step S51 may also be as follows: Fig.10 As shown, including:

[0076] S61. Determine whether the real-time voltage is greater than a voltage safety threshold.

[0077] The microcontroller 10 determines whether the real-time voltage of the trigger 60 is greater than the voltage safety threshold in the self-locking position. If it is greater, the microcontroller 10 drives the motor 20 to work through the driving module 21. If it is less than or equal to the voltage, step S62 is executed.

[0078] In actual applications, the microcontroller 10 pre-stores a voltage safety threshold corresponding to the self-locking position. The value of the voltage safety threshold may depend on the actual application environment and is not specifically limited here and is within the protection scope of this application.

[0079] Optionally, when the microcontroller 10 is factory set, the microcontroller 10 can obtain the maximum safe stroke of the trigger 60 when the reversing device 50 is in the self-locking position, and a second functional relationship between the stroke of the trigger 60 and the voltage of the trigger 60, so as to determine the voltage safety threshold based on the second functional relationship and the maximum safe stroke.

[0080] Specifically, the second functional relationship can be a linear functional relationship or a nonlinear functional relationship. In practical applications, the second functional relationship between the travel of the trigger 60 and the voltage of the trigger 60 can be obtained by referring to the product description or product parameter table of the switch K1, and the second functional relationship can be a data table, a relationship curve or a calculation formula, which is not specifically limited here and depends on the actual application environment, and all are within the protection scope of this application.

[0081] In practical applications, see Figure 2 The microcontroller 10 obtains the switch K1 in the normal working position, the travel range of the trigger 60 in the speed regulation stage, and the voltage range of the trigger 60 corresponding to the travel range. Fig.11 In the speed regulation stage, the stroke of the trigger 60 and its resistance are in a linear relationship, so the stroke of the trigger 60 and its real-time voltage are also in a linear relationship. The microcontroller 10 can determine the voltage safety threshold according to the maximum safety stroke, stroke range and voltage range. Specifically, when the reversing device 50 is in the self-locking position, the maximum voltage safety threshold of the trigger 60 is:

[0082] V3=(Ss-S1)×(V2-V1) / (S2-S1)

[0083] Among them, V3 is the maximum voltage safety threshold of the trigger 60 when the reversing device 50 is in the self-locking position. Specifically, the maximum voltage safety threshold is the voltage value corresponding to the maximum stroke that does not trigger the motor to start, and the value of V3 depends on the maximum voltage within the tool stroke range, that is, it can be between 0-5V. It is not limited to this in actual applications and is within the protection scope of this application; Ss is the maximum safety stroke. Specifically, the maximum safety stroke is the maximum trigger stroke corresponding to the maximum stroke that does not trigger the motor 20 to start; S1 is the starting stroke of the speed regulation stage. Specifically, the starting stroke of the speed regulation stage is the trigger stroke corresponding to the starting speed regulation stage of the motor 20; S2 is the ending stroke of the speed regulation stage. Specifically, the ending stroke of the speed regulation stage is the trigger stroke corresponding to the end of the speed regulation of the motor 20; V1 and V2 are the voltages corresponding to the trigger 60 when they are in S1 and S2, respectively, and S2-S1 is the stroke range of the speed regulation stage.

[0084] See also Fig.11, Ss is the maximum safety stroke. The microcontroller 10 obtains the voltage safety threshold corresponding to the maximum safety stroke and compares it with the real-time voltage of the trigger 60 to determine whether the current stroke of the trigger 60 is within the maximum safety stroke range. The voltage safety threshold can be used to shield part of the stroke in the speed regulation stage. For example, when the trigger 60 is within the maximum safety stroke range, the switch K1 is accidentally touched, and the microcontroller 10 controls the motor 20 to stop. When the real-time voltage of the trigger 60 is greater than or equal to the safety threshold, the microcontroller 10 controls the motor 20 to start, thereby preventing the trigger 60 from being accidentally touched in the self-locking gear.

[0085] by Figure 1 Take an example for demonstration. In actual application, the safety threshold of the pressing force is used to press the trigger 60. Assume that the pressing force is 150N, the connection stroke S0 is 2.0mm, the starting speed regulation stroke S1 is 3mm, and the ending speed regulation stroke S2 ​​is 6.8mm. The maximum safety stroke is Ss, and the voltage of the trigger 60 corresponding to the maximum safety stroke is about 1.6V. Assume that the voltage of the trigger 60 corresponding to the entire stroke range of the trigger 60 in the speed regulation stage is 5V, and the maximum resistance Rmax of the trigger 60 is 70KΩ. When the trigger 60 is in the maximum safety stroke Ss, V3=Ss×1.6 / 5, and its resistance R=V3 / 5×70. It is only necessary to shield 1.6 / 5×100%=32% of the stroke in the speed regulation section to achieve that the force of pressing the trigger 60 is greater than or equal to the safety threshold, such as 150N, thereby preventing accidental touch. The starting speed regulating point is adjusted backward from 3 mm to (6.8-3)×32%=1.216 mm, that is, the starting speed regulating point is changed from 3 mm to 4.216 mm. See Table 1 below for details.

[0086] Table 1

[0087]

[0088]

[0089] S62: If the real-time voltage is less than or equal to the voltage safety threshold, a shutdown control signal is obtained to control the motor to stop working according to the shutdown control signal.

[0090] If the real-time voltage is less than or equal to the voltage safety threshold, the microcontroller 10 obtains a shutdown control signal to control the motor 20 to stop working through the driving module 21 according to the shutdown control signal.

[0091] The electric tool control method provided in this embodiment determines whether the real-time voltage of the push rod D1 is greater than the voltage safety threshold when the reversing device 50 is in the self-locking position, so as to obtain a shutdown control signal when the real-time voltage is less than or equal to the voltage safety threshold, and control the motor 20 to stop working, thereby avoiding the electric tool from starting due to accidental touch, improving the safety performance of the electric tool, and only through software control, without adding or changing mechanical structures, components and other hardware, thereby reducing implementation costs, enhancing the versatility of the design, and saving space for the electric tool.

[0092] Based on the above embodiment, step S30 can be as follows: Fig.12 As shown, including:

[0093] S71. Determine the forward rotation speed of the motor according to the real-time voltage.

[0094] When the real-time voltage is greater than zero, the microcontroller 10 obtains the real-time voltage of the trigger 60 output by the voltage detection unit 40, and obtains the forward speed of the motor 20 based on the real-time voltage of the trigger 60 by referring to the product description or product parameters of the switch K1, so as to drive the motor 20 to work according to the forward speed of the motor 20.

[0095] S72, controlling the motor to rotate forward according to the forward speed.

[0096] The electric tool control method provided in this embodiment meets the safety requirements of electric equipment by controlling the motor 20 to reverse according to the reverse stroke shielding voltage of the motor 20 and the real-time voltage of the trigger 60 in the control loop when the reversing device 50 is in the reverse working gear; and when the reversing device 50 is in the forward working gear and the real-time voltage is greater than zero, the forward speed of the motor 20 is determined according to the real-time voltage of the trigger 60 in the control loop, so as to control the motor 20 to rotate forward according to the forward speed, thereby improving the stroke utilization rate of the trigger 60 and the sensitivity of the electric tool.

[0097] In one embodiment, a power tool control device is provided, and the device is used to implement the power tool control method described in any of the above embodiments. Fig.13 , the device comprises:

[0098] A collection unit 141 is used to obtain the trigger travel;

[0099] The first control unit 142 is used to control the motor 20 to reverse when the reversing device 50 is in the reverse working position and the trigger stroke reaches the motor working stroke;

[0100] The second control unit 143 is used to control the motor 20 to rotate forward when the reversing device 50 is in the forward rotation working position and the trigger stroke reaches the trigger trigger stroke.

[0101] Another embodiment of the present application further provides an electric tool, comprising a reversing device 50, a trigger 60 and the electric tool control device described in the above embodiment, wherein the position of the reversing device 50 includes the forward working position and the reverse working position, and the motor working stroke is not greater than 1 / 3 of the total trigger stroke of the trigger 60. Optionally, the electric tool further comprises a microcontroller 10, a motor 20, a drive module 21, etc., see Figure 1 And corresponding instructions, the actual application is not limited to this, it can be determined according to the specific application environment, all within the protection scope of this application.

[0102] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application. Therefore, as long as they are within the scope of the essence and spirit of the present application, appropriate changes and modifications made to the above embodiments should fall within the scope of protection claimed in the present application.

Claims

1. A method for controlling an electric tool, the electric tool comprising a reversing device and a trigger, characterized in that: The position of the reversing device includes a forward working position and a reverse working position, and the electric tool control method includes: Get the trigger travel; When the reversing device is in the reverse working position and the trigger stroke reaches the motor working stroke, the motor reverses; When the reversing device is in the forward rotation working position and the trigger stroke reaches the trigger trigger stroke, the motor rotates forward.

2. The electric tool control method according to claim 1, characterized in that: The step of obtaining the trigger stroke includes: The real-time voltage of the trigger is obtained, and the trigger stroke is determined according to the real-time voltage.

3. The electric tool control method according to claim 2, characterized in that: When the reversing device is in the reverse working position and the trigger stroke reaches the motor working stroke, the step of reversing the motor further includes: Determining whether the real-time voltage is greater than the reverse stroke shielding voltage; When the real-time voltage is greater than the reverse stroke shielding voltage, the motor is controlled to reverse according to the real-time voltage.

4. The electric tool control method according to claim 3, characterized in that: The step of controlling the motor to reverse according to the real-time voltage comprises: Acquire a first functional relationship between the trigger stroke and the motor speed; Determine the reverse speed of the motor according to the first functional relationship and the real-time voltage; The motor is controlled to reverse according to the reverse speed.

5. The electric tool control method according to claim 2, characterized in that: The electric tool control method further includes: When the reversing device is in the self-locking position, the motor is controlled to stop working.

6. The electric tool control method according to claim 5, characterized in that: The controlling the motor to stop working comprises: Determining whether the real-time voltage is greater than a voltage safety threshold; If the real-time voltage is less than or equal to the voltage safety threshold, a shutdown control signal is obtained; The motor is controlled to stop working according to the shutdown control signal.

7. The electric tool control method according to claim 1, characterized in that: The working stroke of the motor is no greater than 1 / 3 of the total trigger stroke of the trigger.

8. The electric tool control method according to any one of claims 2 to 7, characterized in that: When the reversing device is in the forward rotation working position and the trigger stroke reaches the trigger trigger stroke, the motor rotates forward, comprising: When the real-time voltage is greater than zero, the motor rotates forward; Determining the forward rotation speed of the motor according to the real-time voltage; The motor is controlled to rotate forward according to the forward rotation speed.

9. An electric tool, characterized in that: The electric tool comprises a reversing device and a trigger, wherein the position of the reversing device comprises a forward working position and a reverse working position; the electric tool further comprises: A collection unit, used for obtaining the trigger travel; A first control unit, configured to control the motor to reverse when the reversing device is in the reverse working position and the trigger stroke reaches the motor working stroke; The second control unit is used to control the motor to rotate forward when the reversing device is in the forward working position and the trigger stroke reaches the trigger trigger stroke.

10. The electric tool according to claim 9, characterized in that: The working stroke of the motor is no greater than 1 / 3 of the total trigger stroke of the trigger; and / or the trigger trigger stroke is no greater than 1 / 10 of the total trigger stroke.

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