CN115395823A - Electric tool and control method thereof - Google Patents
Electric tool and control method thereof Download PDFInfo
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- CN115395823A CN115395823A CN202110564427.4A CN202110564427A CN115395823A CN 115395823 A CN115395823 A CN 115395823A CN 202110564427 A CN202110564427 A CN 202110564427A CN 115395823 A CN115395823 A CN 115395823A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 53
- 230000008569 process Effects 0.000 abstract description 22
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 1
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- 238000011897 real-time detection Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details of starting control
- H02P1/022—Security devices, e.g. correct phase sequencing
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- Portable Power Tools In General (AREA)
Abstract
The embodiment of the invention discloses an electric tool and a control method thereof. The electric tool includes: a motor; the battery pack is electrically connected with the motor and provides power supply voltage for the motor; the temperature detection unit is used for detecting and acquiring the temperature of the electric tool in real time; the voltage detection unit is used for detecting and obtaining voltage information of the battery pack in real time; the controller is used for outputting a control signal with a certain duty ratio to control the motor to start; the controller is configured to: acquiring temperature information of the electric tool and voltage information of a battery pack; the duty ratio of a control signal for controlling the start of the motor is changed according to the temperature of the power tool and the voltage information of the battery pack. Therefore, the problems that the prior art is not started at a low temperature or stalls in the starting process and the like can be solved, the problems that the starting voltage is too large, the starting current is too large and the like can be avoided from stalling, and the problem that the electric tool cannot be started due to too low environmental temperature and the like can be avoided, the normal starting of the electric tool is realized, and the electric tool can be normally started even under the low-temperature environment.
Description
Technical Field
The embodiment of the invention relates to the technical field of electric tool control, in particular to an electric tool and a control method thereof.
Background
With the development of electric tools, the intelligent control technology of electric tools is more and more widely applied. For example, the controller is used for driving the motor to realize the characteristics of quick start, smooth braking and the like of the electric tool.
However, when the ambient temperature is low, the conventional electric tool cannot be started or is difficult to start at low temperature, or stops rotating during the starting process, so that the normal starting of the electric tool is affected.
Disclosure of Invention
The invention provides an electric tool and a control method thereof, which aim to solve the problem that the electric tool is not started at low temperature or stops rotating in the starting process.
In a first aspect, an embodiment of the present invention provides an electric tool, including:
a motor;
the battery pack is electrically connected with the motor and provides power supply voltage for the motor;
the temperature detection unit is used for detecting and obtaining the temperature of the electric tool in real time;
the voltage detection unit is used for detecting and obtaining voltage information of the battery pack in real time;
the controller is used for outputting a control signal with a certain duty ratio to control the motor to start;
the controller is configured to:
acquiring temperature information of the electric tool and voltage information of the battery pack;
and changing the duty ratio of the control signal for controlling the motor to start according to the temperature of the electric tool and the voltage information of the battery pack.
Optionally, the controller is configured to:
when the temperature of the electric tool is lower than a preset temperature and the voltage of the battery pack is lower than a first preset voltage, the duty ratio of the control signal is maintained to be the current duty ratio.
Optionally, the controller is configured to:
and when the voltage of the battery pack is smaller than a second preset voltage, reducing the duty ratio of the control signal to be smaller than the current duty ratio.
Optionally, the first preset voltage is greater than the second preset voltage.
Optionally, the preset temperature includes a first preset temperature range and a second preset temperature range;
the first preset voltage in the first preset temperature range is greater than the first preset voltage in the second preset temperature range;
the second preset voltage in the first preset temperature range is greater than the second preset voltage in the second preset temperature range.
Optionally, the temperature of the power tool comprises a temperature of a battery pack and/or a temperature of a motor;
the temperature detection unit is used for detecting the temperature of the battery pack; or, for detecting the temperature of the motor;
or for detecting the temperature of the battery pack and the motor.
In a second aspect, embodiments of the present invention also provide a control method of an electric tool, which is performed by an electric tool including a motor; the battery pack is electrically connected with the motor and provides power supply voltage for the motor; the temperature detection unit is used for detecting and obtaining the temperature of the electric tool in real time; the voltage detection unit is used for detecting and obtaining voltage information of the battery pack in real time; the controller is used for outputting a control signal with a certain duty ratio to control the motor to start;
the control method comprises the following steps:
acquiring temperature information of the electric tool and voltage information of the battery pack;
and changing the duty ratio of the control signal for controlling the motor to start according to the temperature of the electric tool and the voltage information of the battery pack.
Optionally, the changing the duty ratio of the control signal for controlling the motor to start according to the temperature of the power tool and the voltage information of the battery pack includes:
when the temperature of the electric tool is lower than a preset temperature and the voltage of the battery pack is lower than a first preset voltage, maintaining the duty ratio of the control signal as the current duty ratio.
Optionally, after maintaining the duty ratio of the control signal as the current duty ratio when the temperature of the power tool is lower than the preset temperature and the voltage of the battery pack is lower than a first preset voltage, the method further includes:
and when the voltage of the battery pack is smaller than a second preset voltage, reducing the duty ratio of the control signal to be smaller than the current duty ratio.
Optionally, the first preset voltage is greater than the second preset voltage.
Optionally, the preset temperature includes a first preset temperature range and a second preset temperature range;
the first preset voltage in the first preset temperature range is greater than the first preset voltage in the second preset temperature range;
the second preset voltage in the first preset temperature range is greater than the second preset voltage in the second preset temperature range.
Optionally, the temperature of the power tool comprises a temperature of a battery pack and/or a temperature of a motor;
the temperature detection unit is used for detecting the temperature of the battery pack; or, for detecting the temperature of the motor; or for detecting the temperature of the battery pack and the motor.
The invention provides an electric tool and a control method thereof. Can solve prior art and exist not start or stop scheduling problem in the start-up process at low temperature through this electric tool, make electric tool in the start-up process, through the temperature information and the battery package voltage information that acquire electric tool in real time, and according to the real-time change condition of electric tool's temperature and the voltage of battery package real-time regulation motor start required control signal's duty cycle, can avoid appearing that starting voltage is too big, starting current takes place the stall too greatly etc. and ambient temperature leads to unable start scheduling problem when crossing excessively, with the normal start that realizes electric tool, make electric tool also can normal start under low temperature environment.
Drawings
Fig. 1 is a block diagram of a circuit configuration of an electric power tool in an embodiment of the present invention;
FIG. 2 is a schematic diagram of signal changes during start-up of a power tool in an embodiment of the present invention;
fig. 3 is a flowchart of a control method of an electric power tool in the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a block diagram of a circuit structure of an electric tool according to an embodiment of the present invention. Referring to fig. 1, the power tool includes: a motor 10; the battery pack 20 is electrically connected with the motor 10 and provides power supply voltage for the motor 10; a temperature detection unit 30 for detecting and obtaining the temperature of the electric tool in real time; a voltage detection unit 40 for detecting and obtaining voltage information of the battery pack 20 in real time; a controller 50 for outputting a control signal with a certain duty ratio to control the motor 10 to start; the controller 50 is configured to: acquiring temperature information of the power tool and voltage information of the battery pack 20; the duty ratio of the control signal for controlling the start of the motor 10 is changed according to the temperature of the power tool and the voltage information of the battery pack 20.
The motor 10 may be a three-phase motor, and the battery pack 20 is electrically connected to the motor 10 for providing a supply voltage to the motor 10. The controller 50 is configured to output a control signal having a duty cycle to control the start of the motor 10. The voltage detection unit 40 is electrically connected with the battery pack 20 and the controller 50, respectively, and the voltage detection unit 40 is used for detecting and obtaining voltage information of the battery pack 20 in real time and sending the voltage information to the controller 50; the temperature detection unit 30 is electrically connected with the controller 50, and is used for detecting and obtaining the temperature of the electric tool in real time and sending the temperature to the controller 50; in controlling the start of the electric tool, the controller 50 adjusts the duty ratio of a control signal for controlling the start of the motor according to the received voltage information and temperature information to achieve normal start of the electric tool. The controller 50 may be a single chip microcomputer, an Electronic Control Unit (ECU), or the like. The voltage detection unit 40 may be a voltage transformer. The temperature detection unit 30 may be a temperature sensor, a thermistor, or the like.
Generally, stalling occurs during the starting of the power tool due to: the output torque of the electric tool is insufficient, locked rotor occurs, the starting current is overlarge, the device is aged or the voltage of a battery pack is insufficient in the starting process; alternatively, in a low temperature environment, such as a weather of-10 degrees to-20 degrees, the power tool may be started slowly or even not at all. For this reason, according to the electric power tool provided by the embodiment of the present invention, it is possible to realize: the battery pack 20 provides a power supply voltage for the motor 10 to meet the requirements of normal starting of the electric tool and normal working voltage after starting, when the electric tool is started, the controller 50 outputs a control signal with a certain duty ratio (which can be a higher starting duty ratio) to control the starting of the motor, in the starting process of the electric tool, the temperature detection unit 30 detects the temperature of the electric tool in real time and sends the temperature to the controller 50, the voltage detection unit 40 detects the voltage information of the battery pack 20 in real time and sends the voltage information to the controller 50, and the controller 50 adjusts the starting of the electric tool by adjusting the duty ratio of the control signal according to the received voltage information and temperature information, so that the electric tool can be started normally in different temperature environments and starting voltage environments. For example, when the temperature of the electric tool is higher than zero, the controller controls the motor to start normally; when the temperature of the electric tool is lower than zero, the electric tool is difficult to start or cannot be started due to too low temperature, and then the duty ratio of the control signal is adjusted by combining the voltage information of the battery pack and the ambient temperature of the electric tool so as to adjust the starting of the electric tool. Therefore, the duty ratio of the control signal required by the motor starting is adjusted in real time by acquiring the real-time change condition of the temperature information and the voltage information, the conditions that the starting voltage is insufficient, the starting current is overlarge and the like are stopped, and the electric tool is difficult to start when the environmental temperature is too low can be avoided, so that the normal starting of the electric tool is realized, and the electric tool can be started normally even in a low-temperature environment.
An embodiment of the present invention provides an electric tool, including: a motor; the battery pack is electrically connected with the motor and provides power supply voltage for the motor; the temperature detection unit is used for detecting and acquiring the temperature of the electric tool in real time; the voltage detection unit is used for detecting and obtaining voltage information of the battery pack in real time; the controller is used for outputting a control signal with a certain duty ratio to control the motor to start; the controller is configured to: acquiring temperature information of the electric tool and voltage information of a battery pack; the duty ratio of a control signal for controlling the start of the motor is changed according to the temperature of the power tool and the voltage information of the battery pack. The problem that the electric tool cannot be started at a low temperature or stalls in the starting process in the prior art can be solved through the electric tool, the electric tool is enabled to be in the starting process, the temperature information and the battery pack voltage information of the electric tool are acquired in real time, the duty ratio of a control signal required by starting of a motor is adjusted in real time according to the real-time change conditions of the temperature of the electric tool and the voltage of the battery pack, the stalling caused by overlarge starting voltage, overlarge starting current and the like can be avoided, the problem that the electric tool cannot be started when the environmental temperature is too low is solved, the normal starting of the electric tool is realized, and the electric tool can be started normally even in a low-temperature environment.
Fig. 2 is a schematic diagram of signal changes during the starting process of the power tool provided in the embodiment of the present invention. Fig. 2 shows a voltage signal variation curve V0 of the battery pack during the starting process, a duty ratio variation curve D0 of a control signal for starting the motor, a motor rotation speed variation curve N0 during the starting process, and a current variation curve I0 during the starting process.
In one embodiment, the controller is configured to: when the temperature of the electric tool is lower than the preset temperature and the voltage of the battery pack is lower than the first preset voltage, the duty ratio of the control signal is maintained to be the current duty ratio.
Generally, when the electric power tool is started, the voltage of the battery pack is relatively high, the duty ratio of the control signal for adjusting the start of the motor is relatively small, the duty ratio is gradually increased (refer to a change curve D0 of the duty ratio in fig. 2) as the starting process advances, the rotation speed is also gradually increased (refer to a change curve N0 of the rotation speed of the motor in fig. 2) after the increase of the duty ratio, the starting current is gradually increased (refer to a change curve I0 of the current in fig. 2), and the voltage of the battery pack is gradually decreased (refer to a change curve V0 of the voltage signal of the battery pack in fig. 2). When the voltage of the battery pack is reduced to be less than the first preset voltage, the duty ratio of the control signal maintains the current duty ratio unchanged. The current duty ratio refers to a duty ratio of a corresponding control signal when the voltage of the battery pack is reduced to be just smaller than a first preset voltage, for example, the voltage of the battery pack corresponding to the time t1 in fig. 2 is reduced to the first preset voltage, and the duty ratio of the control signal at this time is the duty ratio at the time t1, and the duty ratio at the time t1 is maintained after t 1. In addition, when the temperature of the electric tool is higher than or equal to the preset temperature, the electric tool can be started normally.
If the full voltage of the battery pack is 20V, the first preset voltage may be 15V, and the specific value may be set according to an actual situation, which is not specifically limited herein. The preset temperature may be zero, and the specific value may be set according to an actual situation, which is not specifically limited herein.
On the basis of the above embodiment, after the duty ratio of the control signal is maintained as the current duty ratio when the temperature of the electric tool is lower than the preset temperature and the voltage of the battery pack is lower than the first preset voltage, if the voltage of the battery pack is lower than the second preset voltage, the duty ratio of the control signal is reduced to be lower than the current duty ratio. As can be seen from fig. 2, when the voltage of the battery pack is lower than the lowest starting voltage, the starting current reaches the maximum, and by reducing the duty ratio of the control signal, the rotation speed of the motor can be reduced in response to the reduction of the duty ratio, and the starting current is also reduced when the rotation speed is reduced, so that the motor can be effectively prevented from being stopped due to the fact that the motor cannot be started when the voltage is reduced to the lowest starting voltage.
Optionally, the controller may decrease the duty ratio of the control signal at a certain rate, or may set any duty ratio lower than the current duty ratio.
Referring to fig. 2, at time t1, when the temperature of the electric tool is lower than the preset temperature and the voltage of the battery pack is lower than the first preset voltage, the duty ratio of the control signal is the duty ratio at time t1, and after time t1, the duty ratio at time t1 is maintained to be unchanged, and the voltage of the battery pack continues to decrease. On the basis of the adjustment, when the voltage of the battery pack is smaller than the second preset voltage (refer to the voltage of the battery pack at the time t2 in fig. 2), the duty ratio of the control signal is reduced to be smaller than the duty ratio at the current time (even if the duty ratio is smaller than the duty ratio of the control signal corresponding to the case where the voltage of the battery pack is reduced to be just smaller than the first preset voltage), for example, referring to fig. 2, the duty ratio of the duty ratio variation curve D0 at the time t2 and later is smaller than the duty ratio corresponding to the time t 1.
Optionally, the first preset voltage is greater than the second preset voltage.
If the full voltage of the battery pack is 20V, the first preset voltage may be 15V, the second preset voltage may be 10V, and the specific value may be set according to an actual situation, which is not specifically limited herein.
Optionally, the preset temperature includes a first preset temperature range and a second preset temperature range;
the first preset voltage in the first preset temperature range is greater than the first preset voltage in the second preset temperature range;
the second preset voltage in the first preset temperature range is larger than the second preset voltage in the second preset temperature range.
The first preset temperature range is higher than the second preset temperature range, for example, the first preset temperature range may be-10 to-0 degrees, and the second preset temperature range may be-15 to-10 degrees. The specific temperature range may be set according to actual conditions, and is not limited specifically herein.
The first preset voltage in the first preset temperature range is greater than the first preset voltage in the second preset temperature range; the second preset voltage in the first preset temperature range is larger than the second preset voltage in the second preset temperature range. Specifically, when the temperature of the electric tool is lower than a preset temperature and within a first preset temperature range, and when the voltage of the battery pack is lower than a first preset voltage, the duty ratio of the control signal is maintained as the current duty ratio; after that, when the voltage of the battery pack is less than the second preset voltage, the duty ratio of the control signal is reduced to be less than the current duty ratio. Assuming that the full voltage of the battery pack is 20V, the first preset voltage in the first preset temperature range may be 15V, and the second preset voltage in the first preset temperature range may be 10V.
When the temperature of the electric tool is lower than the preset temperature and within a second preset temperature range, and when the voltage of the battery pack is lower than the first preset voltage, maintaining the duty ratio of the control signal as the current duty ratio; after that, when the voltage of the battery pack is less than the second preset voltage, the duty ratio of the control signal is reduced to be less than the current duty ratio. Assuming that the full voltage of the battery pack is 20V, the first preset voltage in the second preset temperature range may be 10V, and the second preset voltage in the second preset temperature range may be 5V. It should be noted that, no matter in the first preset temperature range or the second preset temperature range, specific values of the first preset voltage and the second preset voltage may be set according to actual situations, and are not specifically limited herein.
Therefore, by setting different temperature range gradients and the sizes of the first preset voltage and the second preset voltage corresponding to the different temperature range gradients, the controller adjusts the output of the duty ratio of the control signal according to the real-time temperature of the electric tool and the real-time voltage of the battery pack, so that the starting of the motor is adjusted, the working efficiency can be improved, and the electric tool can still be normally started under different temperature gradient environments.
Optionally, the temperature of the power tool comprises a temperature of the battery pack and/or a temperature of the motor; a temperature detection unit for detecting a temperature of the battery pack; or, for detecting the temperature of the motor; or for detecting the temperature of the battery pack and the motor. It will be appreciated that the temperature of the power tool may also include the temperature of the working environment in which the tool is located. Thus, the temperature detection unit can also detect the temperature of the working environment in which the electric power tool is located.
Illustratively, the electric tool comprises a host circuit board, wherein a Negative Temperature Coefficient (NTC) Temperature detection (for example, MOS transistor Temperature detection) is arranged on the host circuit board, and the real-time Temperature of the motor can be detected by the NTC on the host circuit board of the electric tool and sent to the controller. The temperature of the battery pack can be directly detected by the temperature sensor and sent to the controller.
The temperature detection unit can also be electrically connected with the battery pack and/or the motor and is used for detecting and obtaining the temperature of the battery pack and/or the motor in real time. Optionally, when the temperature of the electric tool only considers the temperature of the battery pack, the temperature detection unit is electrically connected with the battery pack, in the starting process of the electric tool, the temperature detection unit detects the temperature of the battery pack in real time and sends the temperature to the controller, the voltage detection unit detects the voltage information of the battery pack in real time and sends the voltage information to the controller, and the controller adjusts the duty ratio of a control signal for controlling the motor to start in real time according to the received temperature and voltage information of the battery pack, so that the electric tool can be started normally at different temperatures and starting voltages.
When the temperature of the electric tool only considers the temperature of the motor, the temperature detection unit is electrically connected with the motor, in the starting process of the electric tool, the temperature detection unit detects the temperature of the motor in real time and sends the temperature to the controller, the voltage detection unit detects the voltage information of the battery pack in real time and sends the voltage information to the controller, and the controller adjusts the duty ratio of a control signal for controlling the motor to start in real time according to the received temperature and voltage information of the motor, so that the electric tool can be started normally under different temperatures and starting voltages.
When the temperature of the battery pack and the temperature of the motor need to be considered simultaneously when the temperature of the electric tool is measured, the temperature detection unit is respectively electrically connected with the battery pack and the motor, in the starting process of the electric tool, the temperature detection unit respectively detects the temperature of the battery pack and the temperature of the motor in real time and sends the temperature to the controller, the voltage detection unit detects the voltage information of the battery pack in real time and sends the voltage information to the controller, the controller adjusts the duty ratio of a control signal for controlling the motor to start in real time according to the received temperature of the battery pack, the temperature of the motor and the voltage information, and the electric tool can be started normally under different temperatures and starting voltages. For example, the power tool may adjust the duty ratio of the start control signal according to a lower temperature of the battery pack and the temperature of the motor as the temperature of the power tool, in combination with the voltage information of the battery pack.
Therefore, the temperature of the electric tool can be obtained by detecting the temperature of the battery pack and/or the temperature of the motor, when the temperature detection device of the battery pack or the temperature detection device of the motor fails, the temperature of the electric tool can be obtained by detecting the temperature of the electric tool through the temperature detection device which does not fail, so that the normal starting of the electric tool is ensured, and meanwhile, the influence on the working efficiency of the electric tool caused by the replacement of the temperature detection element or device can be reduced or avoided.
Fig. 3 is a flowchart of a control method of an electric tool according to an embodiment of the present invention, and the embodiment is applicable to a process for implementing the control method of the electric tool, which can be executed by the electric tool according to the embodiment of the present invention, the electric tool including a motor; the battery pack is electrically connected with the motor and provides power supply voltage for the motor; the temperature detection unit is used for detecting and acquiring the temperature of the electric tool in real time; the voltage detection unit is used for detecting and acquiring voltage information of the battery pack in real time; the controller is used for outputting a control signal with a certain duty ratio to control the motor to start;
referring to fig. 3, the control method of the electric power tool includes:
the electric tool comprises a motor, a battery pack, a temperature detection unit, a voltage detection unit, a controller and the like, and particularly, the temperature of the electric tool can be detected in real time by the temperature detection unit and is sent to the controller; the voltage information of the battery pack can be obtained through real-time detection of the voltage detection unit and sent to the controller; the controller controls the output of the duty cycle of the adjustment control signal according to the received temperature and voltage information to adjust the start of the power tool.
And step 120, changing the duty ratio of a control signal for controlling the motor to start according to the temperature of the electric tool and the voltage information of the battery pack.
Specifically, the temperature detection unit detects the temperature of the electric tool in real time and sends the temperature to the controller, the voltage detection unit detects the voltage information of the battery pack in real time and sends the voltage information to the controller, and the controller changes the duty ratio of a control signal for controlling the motor to start according to the received temperature of the electric tool and the voltage of the battery pack. Therefore, the controller can adjust the duty ratio of a control signal for controlling the motor to start according to the real-time temperature of the electric tool and the real-time voltage information of the battery pack so as to adjust the start of the electric tool, and can solve the problems of non-start at low temperature or stalling in the starting process and the like in the prior art, so that the electric tool can avoid the problems of stalling caused by overlarge starting voltage, overlarge starting current and the like, incapability of starting when the environmental temperature is too low and the like by acquiring the temperature information of the electric tool and the voltage information of the battery pack in real time and adjusting the duty ratio of the control signal required by the motor to start according to the real-time change conditions of the temperature of the electric tool and the voltage of the battery pack in the starting process, and the like, thereby realizing the normal start of the electric tool, and enabling the electric tool to be started normally even under the low-temperature environment.
The embodiment of the invention provides a control method of an electric tool, which is executed by the electric tool, wherein the electric tool comprises a motor; the battery pack is electrically connected with the motor and provides power supply voltage for the motor; the temperature detection unit is used for detecting and acquiring the temperature of the electric tool in real time; the voltage detection unit is used for detecting and acquiring voltage information of the battery pack in real time; the controller is used for outputting a control signal with a certain duty ratio to control the motor to start; the control method comprises the following steps: acquiring temperature information of the electric tool and voltage information of a battery pack; the duty ratio of a control signal for controlling the start of the motor is changed according to the temperature of the power tool and the voltage information of the battery pack. The control method can solve the problems that the electric tool is not started at low temperature or stalls in the starting process and the like in the prior art, and can avoid the problems that the electric tool stalls due to overlarge starting voltage, overlarge starting current and the like, and cannot be started due to overlow environmental temperature and the like by acquiring the temperature information of the electric tool and the voltage information of the battery pack in the starting process of the electric tool and adjusting the duty ratio of a control signal required by starting the motor in real time according to the real-time change conditions of the temperature of the electric tool and the voltage of the battery pack, so that the electric tool can be normally started even in a low-temperature environment.
Optionally, the changing the duty ratio of the control signal for controlling the motor to start according to the temperature of the power tool and the voltage information of the battery pack includes:
when the temperature of the electric tool is lower than the preset temperature and the voltage of the battery pack is lower than the first preset voltage, the duty ratio of the control signal is maintained to be the current duty ratio.
Optionally, after maintaining the duty ratio of the control signal as the current duty ratio when the temperature of the power tool is lower than the preset temperature and the voltage of the battery pack is lower than the first preset voltage, the method further includes:
and when the voltage of the battery pack is smaller than the second preset voltage, reducing the duty ratio of the control signal to be smaller than the current duty ratio.
Optionally, the first preset voltage is greater than the second preset voltage.
Optionally, the preset temperature includes a first preset temperature range and a second preset temperature range;
the first preset voltage in the first preset temperature range is greater than the first preset voltage in the second preset temperature range;
the second preset voltage in the first preset temperature range is larger than the second preset voltage in the second preset temperature range.
Optionally, the temperature of the power tool comprises a temperature of the battery pack and/or a temperature of the motor;
a temperature detection unit for detecting a temperature of the battery pack; or, for detecting the temperature of the motor; or for detecting the temperature of the battery pack and the motor.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. A power tool, comprising:
a motor;
the battery pack is electrically connected with the motor and provides power supply voltage for the motor;
the temperature detection unit is used for detecting and obtaining the temperature of the electric tool in real time;
the voltage detection unit is used for detecting and acquiring voltage information of the battery pack in real time;
the controller is used for outputting a control signal with a certain duty ratio to control the motor to start;
the controller is configured to:
acquiring temperature information of the electric tool and voltage information of the battery pack;
and changing the duty ratio of the control signal for controlling the motor to start according to the temperature of the electric tool and the voltage information of the battery pack.
2. The power tool of claim 1, wherein the controller is configured to:
when the temperature of the electric tool is lower than a preset temperature and the voltage of the battery pack is lower than a first preset voltage, the duty ratio of the control signal is maintained to be the current duty ratio.
3. The power tool of claim 2, wherein the controller is configured to:
and when the voltage of the battery pack is smaller than a second preset voltage, reducing the duty ratio of the control signal to be smaller than the current duty ratio.
4. The power tool according to claim 3,
the first preset voltage is greater than the second preset voltage.
5. The power tool of claim 3, wherein the preset temperature includes a first preset temperature range and a second preset temperature range;
a first preset voltage in the first preset temperature range is greater than a first preset voltage in the second preset temperature range;
the second preset voltage in the first preset temperature range is greater than the second preset voltage in the second preset temperature range.
6. The power tool of claim 1, wherein the temperature of the power tool includes a temperature of a battery pack and/or a temperature of a motor;
the temperature detection unit is used for detecting the temperature of the battery pack; or, for detecting the temperature of the motor; or for detecting the temperature of the battery pack and the motor.
7. A control method of an electric tool, characterized by being executed by an electric tool including a motor; the battery pack is electrically connected with the motor and provides power supply voltage for the motor; the temperature detection unit is used for detecting and obtaining the temperature of the electric tool in real time; the voltage detection unit is used for detecting and acquiring voltage information of the battery pack in real time; the controller is used for outputting a control signal with a certain duty ratio to control the motor to start;
the control method comprises the following steps:
acquiring temperature information of the electric tool and voltage information of the battery pack;
and changing the duty ratio of the control signal for controlling the motor to start according to the temperature of the electric tool and the voltage information of the battery pack.
8. The control method of the electric power tool according to claim 7,
the changing of the duty ratio of the control signal for controlling the motor to start according to the temperature of the power tool and the voltage information of the battery pack includes:
when the temperature of the electric tool is lower than a preset temperature and the voltage of the battery pack is lower than a first preset voltage, the duty ratio of the control signal is maintained to be the current duty ratio.
9. The control method of an electric power tool according to claim 8,
when the temperature of the electric tool is lower than a preset temperature and the voltage of the battery pack is lower than a first preset voltage, after the duty ratio of the control signal is maintained as the current duty ratio, the method further comprises:
and when the voltage of the battery pack is smaller than a second preset voltage, reducing the duty ratio of the control signal to be smaller than the current duty ratio.
10. The control method of the electric power tool according to claim 9, wherein the preset temperature includes a first preset temperature range and a second preset temperature range;
the first preset voltage in the first preset temperature range is greater than the first preset voltage in the second preset temperature range;
the second preset voltage in the first preset temperature range is greater than the second preset voltage in the second preset temperature range.
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|---|---|---|---|
| CN202110564427.4A CN115395823A (en) | 2021-05-24 | 2021-05-24 | Electric tool and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110564427.4A CN115395823A (en) | 2021-05-24 | 2021-05-24 | Electric tool and control method thereof |
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| CN202225179U (en) * | 2010-04-07 | 2012-05-23 | 布莱克和戴克公司 | Power tool and power tool system |
| CN104467546A (en) * | 2013-09-25 | 2015-03-25 | 松下电器产业株式会社 | Electric power tool |
| CN110899837A (en) * | 2018-09-18 | 2020-03-24 | 南京德朔实业有限公司 | Electric tool and starting method thereof |
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| WO2007084140A1 (en) * | 2006-01-20 | 2007-07-26 | Carrier Corporation | Electronic method for starting a compressor |
| US20090051306A1 (en) * | 2007-08-24 | 2009-02-26 | Makita Corporation | Electric power tool, control unit and recording medium |
| CN202225179U (en) * | 2010-04-07 | 2012-05-23 | 布莱克和戴克公司 | Power tool and power tool system |
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