Electric tool, chain saw and control method of electric tool

Abstract

The invention discloses an electric tool, a chain saw and a control method of the electric tool. The electric tool comprises a functional part and a shell containing and supporting the functional part. The motor is contained in the shell and used for driving the functional part to work; the power supply device is detachably connected to the shell and used for providing electric energy for the electric tool; the controller is accommodated in the shell and is used for controlling the operation of the motor; wherein the controller is configured as follows: under the condition that the motor is started for the first time after the controller is powered on, the motor is controlled to be started in a first starting mode; under the condition that the motor is not started for the first time after the controller is powered on, the motor is controlled to be started in a second starting mode; a first starting acceleration of the motor in the first starting mode is smaller than a second starting acceleration of the motor in the second starting mode.

Description

Technical Field

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

[0002] After the power tool is started by the user, the controller in the power tool will first be powered, and after being powered, the controller will output a drive signal to control the motor to operate so that the functional parts can work. Some power tools, including some chain saws, are high-current tools, and their working current is higher than that of general power tools. If the conventional method is used to control the motor start, on the one hand, the tool will feel poor when it is started, and on the other hand, the high current at the beginning of the motor start will also lower the output voltage of the battery pack, forming a false undervoltage state, which may have an adverse effect on the battery pack life.

[0003] This section provides background information related to the present application which is not necessarily prior art. Summary of the invention

[0004] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide a power tool, a chain saw and a control method for the power tool.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] An electric tool comprises: a functional part and a shell that accommodates and supports the functional part; a motor, accommodated in the shell, and used to drive the functional part to operate; a power supply device, detachably connected to the shell, and used to provide electrical energy to the electric tool; a controller, accommodated in the shell, and used to control the operation of the motor; wherein the controller is configured to: in the case where the motor is started for the first time after the controller is powered on, a first starting mode is used to control the start of the motor; in the case where the motor is not started for the first time after the controller is powered on, a second starting mode is used to control the start of the motor; a first starting acceleration of the motor in the first starting mode is less than a second starting acceleration in the second starting mode.

[0007] In some embodiments, the controller does not communicate with the power supply device before starting the motor for the first time after power-on, and the controller communicates with the power supply device when the motor is not started for the first time after power-on.

[0008] In some embodiments, the controller is further configured to obtain power parameters of the power supply device when communicating with the power supply device, and to control the motor start-up using a second start-up mode corresponding to the power parameters when the motor is not started for the first time after the controller is powered on.

[0009] In some embodiments, the power supply parameters include one or more of the model, capacity, voltage, and number of parallel-connected battery cells of the power supply device.

[0010] In some embodiments, the second starting acceleration of the motor in the second starting mode is positively correlated with the capacity or the number of parallel-connected battery cells.

[0011] In some embodiments, the controller is further configured to obtain the current ambient temperature of the power tool and control the start-up of the motor using a first start-up mode or a second start-up mode corresponding to the ambient temperature.

[0012] In some embodiments, the controller is further configured to determine the ambient temperature based on an electrical parameter of a thermistor within the power tool.

[0013] In some embodiments, a first starting acceleration of the motor in the first starting mode or a second starting acceleration of the motor in the second starting mode is positively correlated with the ambient temperature.

[0014] A chain saw comprises: a working part, including a guide plate and a chain; a main body, including a shell, the front end of the main body is used to install the working part; a motor, accommodated in the shell, and used to drive the working part to perform cutting; a power supply device, detachably connected to the shell, and used to provide power to the chain saw; a controller, accommodated in the shell, and used to control the operation of the motor; wherein the controller is configured to control the motor to start in a first starting mode when the motor is started for the first time after the controller is powered on; and to control the motor to start in a second starting mode when the motor is not started for the first time after the controller is powered on; a first starting acceleration of the motor in the first starting mode is less than a second starting acceleration in the second starting mode.

[0015] A control method for an electric tool, wherein the method comprises: when the motor of the electric tool is started for the first time after the controller of the electric tool is powered on, a first starting mode is used to control the start of the motor; when the motor is not started for the first time after the controller is powered on, a second starting mode is used to control the start of the motor; a first starting acceleration of the motor in the first starting mode is less than a second starting acceleration in the second starting mode.

[0016] The benefits of this application are: avoiding the problem of large current pulling down the battery pack voltage to form a false undervoltage state when the power tool is first started after being powered on in low-temperature working environments, small-capacity battery packs, etc., reducing the life of the tool and battery pack and safety threats, and improving the user feel when starting the power tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a plan view of an electric tool as an embodiment of the present application;

[0018] Figure 2 yes Figure 1 The electric control schematic diagram of the electric tool shown;

[0019] Figure 3 yes Figure 1 Another electrical control schematic diagram of the electric tool shown;

[0020] Figure 4 yes Figure 1 The control flow chart of the controller starting the motor in the electric tool shown;

[0021] Figure 5 yes Figure 1 Another control flow chart of the controller starting the motor in the electric tool shown;

[0022] Figure 6 yes Figure 1 Another control flow chart of the controller starting the motor in the electric tool shown. DETAILED DESCRIPTION

[0023] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0024] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0025] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0026] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0027] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0028] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0029] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0030] In this application, the terms "controller", "processor", "central processing unit", "CPU", and "MCU" are interchangeable. When a unit "controller", "processor", "central processing unit", "CPU", or "MCU" is used to perform a specific function, unless otherwise specified, these functions can be performed by a single unit or multiple units.

[0031] In the present application, the terms “device”, “module” or “unit” may be implemented in the form of hardware or software to achieve specific functions.

[0032] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0033] After the power tool is started by the user, its controller is powered first. After being powered, the controller will output a drive signal to the motor to control the motor operation, thereby driving the functional parts to operate. Some power tools, including some chain saws, are high-current tools, and their working current is higher than that of general tools. If the motor is started in a conventional way, that is, the motor is accelerated at a high acceleration after the controller is powered on, on the one hand, the starting feel of the tool is poor, and the user may feel uncomfortable. On the other hand, the high current at the first start will also lower the output voltage of the battery pack, forming a false undervoltage state, and may have an adverse effect on the life of the battery pack. The above problems are particularly serious when the battery pack capacity is small and the power tool is in a low-temperature working environment.

[0034] The technical solution proposed in this application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Figure 1 An electric tool 100 is shown as one embodiment in the present application. Figure 1 The electric tool 100 shown is a chain saw 100a, and the electric tool 100 in other embodiments may also be other types of handheld electric tools 100 such as circular saws, electric drills, impact wrenches, or bench tools 100 such as miter saws and table saws, or outdoor power equipment 100 such as lawn mowers and snow blowers. The following mainly provides an exemplary description of the chain saw 100a, but it is understandable that the electric tool 100 to which the technical solution of the present application is applied is not limited to the chain saw 100a, nor is it limited to the tool categories described above.

[0036] refer to Figures 1 to 3 The electric tool 100 includes a housing 10, a functional part 20, a motor 30 and a power supply device 40. The housing 10 constitutes the main body of the electric tool 100, which connects and supports the above-mentioned components and forms a storage space, which can accommodate or partially accommodate the above-mentioned components. The functional part 20 is a component of the electric tool 100 that actually performs operations such as cutting, tightening, grinding, and impacting. In this embodiment, the functional part 20 in the chain saw 100a is a chain 20a. The chain 20a and the guide plate 21a can form a working part installed at the front of the chain saw 100a. The guide plate 21a will extend forward from the front end of the housing 10. The chain 20a is arranged around the outer periphery of the guide plate 21a. When the chain saw 100a is working, the chain 20a will rotate around the guide plate 21a and cut the target parts such as wood and metal. The electric tool 100 generally also includes operating components for the user to start or stop the motor 30 to be described later, but this does not rule out the possibility of being started directly by connecting a power cord to the mains or plugging in a battery pack, etc. without operating components.

[0037] The motor 30 is the prime mover in the electric tool 100. When the motor shaft of the motor 30 rotates, it can drive the functional part 20 directly or indirectly through the transmission assembly. In this embodiment, after the motor shaft rotates, it drives the chain 20a to move around the guide plate 21a directly or indirectly through the transmission assembly to perform the cutting operation. In some examples, the motor 30 can be a brushless motor 30. The power supply device 40 provides electric energy for the electric tool 100, which at least supplies power to the motor 30 and the controller 50 to be described later, that is, the power supply device 40 is electrically connected to the motor 30 and the controller 50 to be described later. It should be noted that what is described here is an electronic circuit for transmitting electric energy rather than an electronic circuit for transmitting data information. In some examples, the power supply device 40 can be a battery pack, which is detachably connected to the electric tool 100 such as the chain saw 100a. In other examples, the power supply of the electric tool 100 such as the chain saw 100a can also be realized by using a mains power supply, an AC power supply with a power adapter or related circuits such as a transformer, a rectifier, and a voltage regulator.

[0038] refer to Figure 2 , Figure 3 In addition to the housing 10, the functional parts 20, the motor 30 and the power supply device 40, the power tool 100 also includes a controller 50 for controlling the operation of the motor 30. The controller 50 may be an MCU (Microcontroller Unit), an ARM (Advanced Reduced Instruction Set Computing Machine), a DSP (Digital Signal Processor), etc., and controls the operation of the motor 30 by executing relevant programs. The controller 50 generally outputs corresponding control signals to the motor 30 to make the motor 30 run at the intended speed and direction. Usually, in order to drive the motor 30 to operate normally, the power tool 100 should also include a drive device 60 such as an inverter bridge and an integrated drive chip. The drive device 60 will be electrically connected to the controller 50 and the motor 30, and receive the control signal from the controller 50 to output the corresponding drive signal to the motor 30. In some cases, the electric tool 100 may further include a parameter detection device 70 for detecting parameters such as the speed, torque, and rotor position of the motor 30. The controller 50 may need to use the above parameters from the parameter detection device 70 to control the operation of the motor 30. On this basis, the controller 50 can control the motor speed and the speed change process by running the relevant control program. For example, the controller 50 can control the motor 30 to increase to the set speed at the set acceleration. Of course, the controller 50 can also control the motor speed to change in a nonlinear manner or other complex manners.

[0039] In order to clarify the subsequent technical solutions, the startup process of the power tool 100 is explained below. After the tool is started by the user, the power supply device 40 will first supply power to the controller 50. Although the controller 50 has received power from the power supply device 40 at the beginning of power supply, it has not yet communicated with the power supply device 40 and cannot obtain the power supply parameter information of the power supply device 40 such as model, capacity, voltage, number of parallel cells, etc. The controller 50 will start to control the motor 30 to start without power supply parameters. However, after a short period of time, the controller 50 can exchange the above power supply parameter information with the power supply device 40. In view of the relevant issues in the above startup process described above, in order to ensure the life and safety of the power tool 100 and its assembled battery pack 40, and to improve the user's feel when the tool is started, this application will propose a more accurate and effective power tool 100 motor 30 startup control scheme.

[0040] The controller 50 of the electric tool 100 is configured to use the first starting mode to control the motor 30 to start when the motor 30 is started for the first time after power-on, and to use the second starting mode to control the motor 30 to start when the motor 30 is not started for the first time after power-on. The first starting acceleration of the motor 30 in the first starting mode is less than the second starting acceleration in the second starting mode.

[0041] In this embodiment, the first time the motor 30 is started after the controller 50 is powered on is when the power tool 100 is turned on after the whole machine is powered off, for example, each time the power tool 100 is used, in which case the controller 50 has not communicated with the power supply device 40 before starting the motor 30, and there is no power supply parameter information. The non-first time the motor 30 is started after the controller 50 is powered on is when the whole machine is not powered off, the controller 50 is not powered off, but the motor 30 is powered off or stopped, for example, when the trigger is released briefly during the use of the power tool 100 and then pulled again to start, in which case the controller 50 has communicated with the power supply device 40 before restarting the motor 30, and there is power supply parameter information.

[0042] The controller 50 will adopt different starting modes for the above two starting situations. The difference between the first starting mode adopted in the case of starting the motor 30 for the first time and the second starting mode adopted in the case of starting the motor 30 for the non-first time is that the first starting acceleration of the motor 30 in the first starting mode is lower than the second starting acceleration of the motor 30 in the second starting mode at least in the initial stage. Specifically, assuming that in the first starting mode, the controller 50 controls the motor speed to increase from zero to the target speed at the first starting acceleration, and in the second starting mode, the controller 50 controls the motor speed to increase from zero to the target speed at the second starting acceleration, the first starting acceleration is lower than the second starting acceleration.

[0043] In the above embodiment, the electric tool 100 can start the motor 30 in a relatively smooth process when the relevant information such as the battery pack capacity and the ambient temperature is unknown, so that the user can gradually adapt to the feel of the tool and avoid safety and life threats such as large current pulling down the battery pack voltage. In the case of non-initial start of the motor 30, on the one hand, the electric tool 100 has not fallen into the whole machine power-off state, the power supply device 40 is still supplying power to the outside, and the battery pack has also heated up. The safety and life threats of the tool and the battery pack by starting the motor 30 in a relatively fast process are sufficient to be alleviated; on the other hand, the relevant information such as the battery pack capacity and the ambient temperature may have been obtained, and the motor 30 can be started in a corresponding manner; in addition, the battery pack has heated up and the user has also become accustomed to the feel of the tool.

[0044] In some embodiments, reference Figure 4 , Figure 4 A flow chart of a control scheme for the controller 50 in the electric tool 100 to start the motor 30, specifically including:

[0045] 410, the controller 50 obtains the current ambient temperature of the electric tool 100;

[0046] 420, when the controller 50 starts the motor 30 for the first time after power-on, the controller 50 uses a first starting mode corresponding to the current ambient temperature to control the motor 30 to start;

[0047] 430 , when the controller 50 is not starting the motor 30 for the first time after power-on, the controller 50 adopts the second starting mode to control the motor 30 to start, and the first starting acceleration is lower than the second starting acceleration.

[0048] Among them, the speed change process of the controller 50 controlling the motor 30 to start in the first starting mode corresponding to the current ambient temperature is related to the ambient temperature. Specifically, the first starting acceleration of the motor 30 starting in the first starting mode corresponding to the current ambient temperature is related to the ambient temperature. In some examples, the first starting acceleration is positively correlated with the ambient temperature. When the ambient temperature is lower, the first starting acceleration is smaller, and the motor 30 starts more slowly in the first starting mode. When the ambient temperature is higher, the first starting acceleration is larger, and the motor 30 starts faster in the first starting mode. The positive correlation between the first starting acceleration and the ambient temperature can be linear or nonlinear, which can be determined by the actual scene requirements such as the visual tool category and working conditions. In other examples, the first starting acceleration is set to two different values ​​depending on whether the ambient temperature is lower than the first temperature threshold. When the ambient temperature is lower than the first temperature threshold, the smaller value is selected, and when the ambient temperature exceeds the first temperature threshold, the larger value is selected.

[0049] In some other embodiments, reference Figure 5 , Figure 5A flow chart of another control scheme for the controller 50 in the electric tool 100 to start the motor 30, specifically including:

[0050] 510, the controller 50 obtains the current ambient temperature of the electric tool 100;

[0051] 520, when the controller 50 starts the motor 30 for the first time after power-on, the controller 50 adopts the first starting mode to control the motor 30 to start, and the first starting acceleration is lower than the second starting acceleration;

[0052] 530 , when the controller 50 is not starting the motor 30 for the first time after power-on, the controller 50 adopts the second starting mode corresponding to the current ambient temperature to control the starting of the motor 30 .

[0053] Among them, the speed change process of the controller 50 controlling the motor 30 to start in the second starting mode corresponding to the current ambient temperature is related to the ambient temperature. Specifically, the second starting acceleration is positively correlated with the ambient temperature. The lower the ambient temperature, the smaller the second starting acceleration, and the higher the ambient temperature, the larger the second starting acceleration. The positive correlation between the two can be linear or nonlinear, which can be determined by the actual scene requirements such as the tool category and working conditions. Alternatively, the second starting acceleration is set to two different values ​​depending on whether the ambient temperature is lower than the second temperature threshold. When the ambient temperature is lower than the second temperature threshold, the smaller value is selected, and when the ambient temperature exceeds the second temperature threshold, the larger value is selected.

[0054] There are many optional implementation methods for the controller 50 to obtain the current ambient temperature of the power tool 100. In one embodiment, the controller 50 can obtain the current ambient temperature by detecting the electrical parameters of the thermistor in the relevant circuit. Specifically, the controller 50 can convert the current ambient temperature based on the temperature characteristics of the NTC element (Negative Temperature Coefficient) on the MOS board, such as resistance, voltage, current and other electrical parameters. In other embodiments, the controller 50 can also obtain the ambient temperature at other temperature measurement points through other types of temperature sensors.

[0055] The above two types of embodiments describe that the ambient temperature can be included in the motor starting strategy as an independent variable when the motor 30 is started for the first time or non-first time after the controller 50 is powered on. Parameters such as starting acceleration in the first or second starting mode will be adjusted accordingly as dependent variables. When the first starting acceleration and the second starting acceleration are both positively correlated with the ambient temperature, the mapping relationship between the two and the ambient temperature can be different to adapt to the impact of the ambient temperature on different motor starting conditions.

[0056] In some embodiments, reference Figure 6 , Figure 6A flow chart of another control scheme for the controller 50 in the electric tool 100 to start the motor 30, specifically including:

[0057] 610 , when the controller 50 starts the motor 30 for the first time after power-on, the controller 50 adopts the first starting mode to control the motor 30 to start, and the first starting acceleration is lower than the second starting acceleration;

[0058] 620, the controller 50 acquires power parameters of the power supply device 40 after being able to exchange data information with the power supply device 40 such as a battery pack;

[0059] 630 , when the controller 50 is not starting the motor 30 for the first time after power-on, the controller 50 uses the second starting mode corresponding to the current power supply parameters to control the starting of the motor 30 .

[0060] Among them, in the second starting mode corresponding to the current power supply parameters, the speed change process of the controller 50 controlling the start of the motor 30 is related to the power supply parameters, and the power supply parameters are not limited to one or more of the model, capacity, voltage, and number of parallel battery cells of the power supply device 40 such as a battery pack. In some embodiments, the controller 50 may also pre-store other power supply parameters that have a corresponding relationship with the power supply parameters such as the model of the power supply device 40.

[0061] In the second start-up mode, the speed change process of the controller 50 controlling the start of the motor 30 is related to the power supply parameters of the power supply device 40, and there are multiple optional implementation methods. In some embodiments, the second start-up acceleration of the motor 30 started in the second start-up mode corresponding to the current power supply parameters is related to the power supply parameters. In some examples, the second start-up acceleration can be positively correlated with the capacity and / or the number of parallel cells of the power supply device 40. The smaller the battery pack capacity and / or the number of parallel cells, the smaller the second start-up acceleration. The larger the battery pack capacity and / or the number of parallel cells, the larger the second start-up acceleration. The positive correlation between the second start-up acceleration and the battery pack capacity and / or the number of parallel cells can be linear or nonlinear. In other examples, the second start-up acceleration can also be related to the calculated values ​​of one or more of the above-mentioned capacity, voltage, number of parallel cells and other power supply parameters. For example, the relationship between the two can be a weighted sum or other nonlinear relationship, which can be determined by the actual scene requirements such as the tool category and working conditions.

[0062] In other embodiments, after obtaining the power supply parameters of the power supply device 40, if the first start-up process of the motor 30 in the first start-up mode has not been completed, the controller 50 may also switch to the second start-up mode to control the motor 30 to continue starting. Specifically, assuming that the controller 50 controls the motor 30 to increase its speed to the target speed at the first start-up acceleration when the motor 30 is first started after power-on, the controller 50 interacts with the battery pack 40 to obtain power supply parameters such as the battery pack capacity and the number of parallel cells in the process of the motor 30 accelerating to the target speed at the first start-up acceleration, and the controller 50 changes to the second start-up acceleration to control the motor 30 to continue to increase from the current speed until the target speed is reached.

[0063] It can be understood that the above-mentioned multiple types of embodiments are only exemplary illustrations of the scheme concept of the present application. Cross-combining the above-mentioned embodiments or parts of the above-mentioned embodiments can naturally lead to other derivative schemes. In one example, when the controller 50 starts the motor 30 for the first time after power-on, the first starting acceleration can be lower than the second starting acceleration to achieve a smooth start of the motor 30. The first starting acceleration does not take into account the ambient temperature. When the motor 30 is not started for the first time after power-on, the second starting acceleration that is proportional to the number of parallel cells in the currently acquired battery pack can be used to achieve a fast start of the motor 30. In another example, when the controller 50 starts the motor 30 for the first time after power-on, the first starting acceleration that is lower than the second starting acceleration and proportional to the current ambient temperature can be used to achieve a smooth start of the motor 30. When the motor 30 is not started for the first time after power-on, the second starting acceleration that is proportional to the currently acquired battery pack capacity can be used to achieve a fast start of the motor 30. As another example, when the controller 50 starts the motor 30 for the first time after power-on, it can start the motor 30 smoothly with a first starting acceleration that is lower than the second starting acceleration, and after interactively obtaining power parameters such as the number of parallel cells in the battery pack, and if the first start of the motor 30 performed with the first starting acceleration is not completed, the second starting acceleration that is proportional to the number of parallel cells in the battery pack is used to complete the first start of the remaining motor 30.

[0064] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. An electric tool comprising: A functional part and a housing for accommodating and supporting the functional part; A motor, contained in the housing, and used to drive the functional parts to operate; a power supply device, detachably connected to the housing, for providing electrical energy to the power tool; A controller, contained in the housing, for controlling the operation of the motor; Wherein, the controller is configured as follows: when the motor is started for the first time after the controller is powered on, the first starting mode is used to control the start of the motor; when the motor is not started for the first time after the controller is powered on, the second starting mode is used to control the start of the motor; the first starting acceleration of the motor in the first starting mode is less than the second starting acceleration in the second starting mode.

2. The electric tool according to claim 1, wherein: The controller does not communicate with the power supply device before starting the motor for the first time after power-on, and the controller communicates with the power supply device when starting the motor not for the first time after power-on.

3. The electric tool according to claim 2, wherein: The controller is also configured to obtain power supply parameters of the power supply device when communicating with the power supply device, and to control the start of the motor using the second start mode corresponding to the power supply parameters when the motor is not started for the first time after the controller is powered on.

4. The electric tool according to claim 3, wherein: The power supply parameters include one or more of the model, capacity, voltage, and number of parallel-connected battery cells of the power supply device.

5. The electric tool according to claim 4, wherein: The second starting acceleration of the motor in the second starting mode is positively correlated with the capacity or the number of parallel-connected battery cells.

6. The electric tool according to any one of claims 1 to 5, wherein: The controller is further configured to obtain a current ambient temperature of the electric tool, and control the start-up of the motor using the first start-up mode or the second start-up mode corresponding to the ambient temperature.

7. The electric tool according to claim 6, wherein: The controller is further configured to determine the ambient temperature based on an electrical parameter of a thermal element within the power tool.

8. The electric tool according to claim 6, wherein: The first starting acceleration of the motor in the first starting mode or the second starting acceleration of the motor in the second starting mode is positively correlated with the ambient temperature.

9. A chain saw comprising: Working parts, including guide plates and chains; A main body, comprising a shell, wherein the front end of the main body is used for mounting the working component; A motor, contained in the housing, for driving the working component to perform cutting; a power supply device, detachably connected to the housing, for providing electrical energy to the chain saw; A controller, contained in the housing, for controlling the operation of the motor; Among them, the controller is configured to use a first starting mode to control the start of the motor when the motor is started for the first time after the controller is powered on; and to use a second starting mode to control the start of the motor when the motor is not started for the first time after the controller is powered on; the first starting acceleration of the motor in the first starting mode is less than the second starting acceleration in the second starting mode.

10. A method for controlling an electric tool, wherein: The method comprises: When the motor of the electric tool is started for the first time after the controller of the electric tool is powered on, the first starting mode is used to control the start of the motor; When the motor is not started for the first time after the controller is powered on, the second starting mode is used to control the motor to start; A first starting acceleration of the motor in the first starting mode is smaller than a second starting acceleration of the motor in the second starting mode.

Images