CN115929675A - Electric tool and wind speed control method - Google Patents

Abstract

The invention discloses an electric tool and a wind speed control method. The control method includes the following steps: when the fan is in an intelligent mode, controlling a temperature sensor in the fan to detect an ambient temperature value; receiving the ambient temperature value detected by the temperature sensor ; Process the ambient temperature value to obtain a second temperature value, determine the temperature range in which the second temperature value falls, calculate the corresponding duty cycle according to the temperature range, and control the motor according to the corresponding duty cycle Rotational speed; the corresponding duty cycle and the temperature range have different linear relationships in different temperature ranges, and the duty cycle increases with the increase of the temperature range. The electric tool and its wind speed control method provided by the present invention can immediately enter the smart mode by default when the tool is powered on, and calculate according to the real-time monitored external environment temperature to obtain the corresponding duty cycle, so as to adjust the tool's speed and make the tool More intelligent, improve user experience.

Description

Electric tool and wind speed control method

[Technical field]

The present invention relates to the field of electric tools, and more specifically, to a wind speed control method.

[Background technology]

Fans are essential power tools in people's lives. In the hot summer, the rotation of the fan can bring people a large amount of air, making people cool and refreshed. However, most fans are manually operated and rely on fixed gears for adjustment, which is difficult to meet people's diverse needs. For example, when people are resting, if the ambient temperature rises or falls, the fan cannot be adjusted adaptively, which will affect people's rest quality, and even cause people to catch a cold at low temperatures and high fan speeds, bringing inconvenience to life.

Please refer to the Chinese utility model patent No. CN208311099U published on January 1, 2019, which discloses a manual and automatic dual-purpose fan. In the manual operation mode, the fan gear is controlled by a knob. In the automatic mode, the temperature sensor detects the ambient temperature in real time and sends the detected temperature value to the single-chip microcomputer. The single-chip microcomputer controls the motor in real time according to the temperature value. When the temperature rises, the wind speed is automatically increased. When the temperature drops, the wind speed can be automatically reduced or even the fan is turned off. Although it has both manual and automatic modes and can be adjusted adaptively, it is still not intelligent enough. It cannot be adjusted to the corresponding wind speed immediately at the moment of power on, and the wind speed adjustment depends on the internal storage value of the single-chip microcomputer, that is, the wind speed is controlled by the corresponding relationship between the gear and the temperature range stored internally. Not only are there relatively few gear settings, but it cannot be calculated in real time according to the changes in the external temperature to obtain the most comfortable wind speed for the human body, and it cannot meet people's living needs.

Therefore, it is necessary to design an electric tool and a wind speed control method to solve the above problems.

[Summary of the invention]

In view of the shortcomings of the prior art, the present invention aims to provide an electric tool and a wind speed control method, that is, the fan can be adjusted to the corresponding wind speed immediately when it is turned on in the intelligent mode, and during operation, the wind speed can be adjusted in real time according to the change of ambient temperature. This solves the problem that the traditional intelligent fan cannot be adjusted to the corresponding wind speed immediately when it is turned on and has few gears.

The present invention solves the existing technical problems by adopting the following technical solutions: an electric tool, the electric tool comprising:

Temperature sensor, used to detect ambient temperature;

Trigger, used to switch between manual mode and smart mode;

MCU, used for receiving the ambient temperature value detected by the temperature sensor;

The MCU processes the ambient temperature value to obtain a second temperature value, determines a temperature interval into which the second temperature value falls, calculates a corresponding duty cycle according to the temperature interval, and controls the motor speed according to the corresponding duty cycle;

The corresponding duty cycle and the temperature range present different linear relationships within different temperature ranges, and the duty cycle increases as the temperature range increases.

为占空比，l为温度区间。A further improvement is that the relationship between the duty cycle and the temperature range is:

is the duty cycle, l is the temperature range.

A further improvement scheme is: the MCU obtains multiple temperature thresholds, and divides the temperature interval range according to the temperature thresholds;

In different temperature ranges, the temperature ranges are divided based on different particle sizes;

When the temperature interval is greater than a first temperature threshold and less than a second temperature threshold, the temperature interval is divided according to a first granularity;

When the temperature interval is greater than the second temperature threshold and less than the third temperature threshold, the temperature interval is divided according to the second granularity.

A further improvement is as follows: the first granularity is 1, the second granularity is 2, and the duty cycle division criteria are as follows: when the temperature value is less than the first threshold, it is divided into interval 0; when the temperature value is within the first threshold and the second threshold, the temperature interval is divided into intervals 1 to 10 according to the first granularity; when the temperature value is between the second threshold and the third threshold, the temperature interval is divided into intervals 11 to 14 according to the second granularity; and when the temperature value is above the third threshold, it is divided into interval 15.

A further improved solution is: the second temperature value is equal to the ambient temperature value.

A further improvement scheme is: a wind speed control method, applied to a smart fan, the method comprising: when the fan is in smart mode, controlling the temperature sensor in the fan to detect the ambient temperature value; receiving the ambient temperature value detected by the temperature sensor; processing the ambient temperature value to obtain a second temperature value, determining the temperature interval into which the second temperature value falls, calculating the corresponding duty cycle according to the temperature interval, and controlling the motor speed according to the corresponding duty cycle; the corresponding duty cycle and the temperature interval present different linear relationships within different temperature intervals, and the duty cycle increases with the increase of the temperature interval.

为占空比，l为温度区间。A further improvement is that the relationship between the duty cycle and the temperature range is:

is the duty cycle, l is the temperature range.

A further improvement is as follows: the wind speed control method further includes: the MCU obtains a plurality of temperature thresholds, and divides the temperature interval range according to the temperature thresholds;

In different temperature ranges, the temperature ranges are divided based on different particle sizes;

When the temperature interval is greater than a first temperature threshold and less than a second temperature threshold, the temperature interval is divided according to a first granularity;

When the temperature interval is greater than the second temperature threshold and less than the third temperature threshold, the temperature interval is divided according to the second granularity.

A further improvement is as follows: the first granularity is 1, the second granularity is 2, and the duty cycle division criteria are as follows: when the temperature value is less than the first threshold, it is divided into interval 0; when the temperature value is within the first threshold and the second threshold, the temperature interval is divided into intervals 1 to 10 according to the first granularity; when the temperature value is between the second threshold and the third threshold, the temperature interval is divided into intervals 11 to 14 according to the second granularity; and when the temperature value is above the third threshold, it is divided into interval 15.

A further improved solution is: the second temperature value is equal to the ambient temperature value.

Compared with the prior art, the present invention has the following beneficial effects: the electric tool and wind speed control method provided by the present invention can enter the intelligent mode by default immediately when the tool is powered on, and calculate according to the real-time monitored external ambient temperature to obtain the corresponding duty cycle to adjust the tool's rotation speed, making the tool more intelligent and improving the user experience.

【Brief Description of the Drawings】

The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

FIG1 is a schematic diagram of a preferred embodiment of the present invention;

FIG2 is a block diagram of the principle of the intelligent mode of a preferred embodiment of the present invention;

FIG3 is a flow chart of the intelligent mode of a preferred embodiment of the present invention;

Meaning of the reference numerals in the figures:

Power Tools 1

Temperature sensor 11

MCU12

Motor 13

Power module 14

Trigger 15

Knob 21

Smart Button 22

The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings.

[Specific implementation method]

The present invention is further described in detail below in conjunction with the accompanying drawings and implementation modes.

The wind speed control method described in the present invention is applicable to intelligent equipment such as electric tools/electric equipment, wherein the electric tools/electric equipment may be fans, hair dryers, or other automated equipment that requires wind speed control; as long as the above-mentioned equipment/tools can adopt the essential content of the technical solution disclosed below, they can fall within the protection scope of the present invention.

Refer to the schematic diagram of a preferred embodiment of the present invention shown in FIG1. In this embodiment, the electric tool includes, but is not limited to, a temperature sensor 11, an MCU (micro control unit) 12, a motor 13, a power module 14 and a trigger 15. The micro control unit MCU is electrically connected to the temperature sensor, the motor and the trigger, and the power module is electrically connected to the trigger and the motor. The trigger includes a knob 21 and a smart button 22, and the knob is a manual adjustment knob, which can be manually rotated to perform stepless speed regulation to control the appropriate wind speed.

In this embodiment, the power tool enters the smart mode by default when it is turned on, and automatically calculates the appropriate duty cycle according to the ambient temperature, and adjusts the motor speed according to the duty cycle to adjust the wind speed. If you want to manually adjust the wind speed of the power tool during the operation of the smart mode, one implementation method is to press the smart button to end the smart mode, and then rotate the knob to adjust the wind speed; another implementation method is to directly rotate the knob to end the smart mode and enter the manual mode.

In this embodiment, the temperature sensor is used to detect the current ambient temperature.

为占空比，l为温度区间，计算出对应的占空比，根据所述占空比控制电机运行。即，风扇在运行过程中可以根据环境温度的变化，实时计算，输出对应的占空比，根据所述占空比控制电机转速，以调节合适的风速。本发明提供的方案可有效避免夜晚温度降低而风速过高的情况出现，解决了人们因夜间风扇风速原因引起的感冒问题。The MCU is used to receive the ambient temperature value detected by the temperature sensor, and process the detected ambient temperature value to obtain a second temperature value, determine the temperature interval according to the second temperature value, and substitute the temperature interval value into the formula, that is,

is the duty cycle, l is the temperature range, the corresponding duty cycle is calculated, and the motor operation is controlled according to the duty cycle. That is, during the operation of the fan, the corresponding duty cycle can be calculated in real time according to the change of the ambient temperature, and the motor speed can be controlled according to the duty cycle to adjust the appropriate wind speed. The solution provided by the present invention can effectively avoid the situation where the wind speed is too high when the temperature drops at night, and solves the problem of people catching colds due to the fan wind speed at night.

The method for obtaining the second temperature value is to intercept two ambient temperature values t ₁ and t ₂ detected by the temperature sensor within a period of time Ｔ during the operation of the smart mode, calculate the slope K of the curve of temperature and time, the formula is K＝(t ₁ -t ₂ )÷Ｔ, and obtain a temperature preset value t ₃ at a future time T ₁ according to the slope K of the curve, the formula is t ₃ ＝t ₂ -K×T ₁ , where Ｔ is equal to T ₁ . The second temperature value obtained by the above method is an estimated ambient temperature value. By using the method of estimating the ambient temperature value, the change of wind speed can be made smoother, the user's discomfort can be reduced, and the user experience can be improved. In other embodiments, the second temperature value is equal to the ambient temperature value.

The motor is used to drive the electric tool to operate.

The power module is used to provide electrical energy to the electric tool.

中，其中,

为占空比，l为温度区间。MCU根据计算得出的占空比，控制电机转速从而控制风速。即，风扇在运行过程中可以根据环境温度的变化，实时计算，输出对应的占空比，根据所述占空比控制电机转速，以调节合适的风速。本发明提供的方案可有效避免夜晚温度降低而风速过高的情况出现，解决了人们因夜间风扇风速原因引起的感冒问题。Refer to the principle block diagram of the intelligent mode of the preferred embodiment of the present invention shown in FIG2. When the power tool is in the intelligent mode, the temperature sensor detects the ambient temperature, processes the detected ambient temperature value to obtain a second ambient temperature value, and then sends the second ambient temperature value to the MCU. The MCU determines the temperature interval into which the second temperature value falls, and substitutes the obtained temperature interval value into the formula

Among them,

is the duty cycle, and l is the temperature range. The MCU controls the motor speed and thus the wind speed according to the calculated duty cycle. That is, during the operation of the fan, the fan can calculate and output the corresponding duty cycle in real time according to the change of the ambient temperature, and control the motor speed according to the duty cycle to adjust the appropriate wind speed. The solution provided by the present invention can effectively avoid the situation where the wind speed is too high when the temperature drops at night, and solves the problem of people catching colds due to the fan wind speed at night.

The method for obtaining the second temperature value is to intercept two ambient temperature values t ₁ and t ₂ detected by the temperature sensor within a period of time Ｔ during the operation of the smart mode, calculate the slope K of the curve of temperature and time, the formula is K＝(t ₁ -t ₂ )÷Ｔ, and obtain a temperature preset value t ₃ at a future time T ₁ according to the slope K of the curve, the formula is t ₃ ＝t ₂ -K×T ₁ , where Ｔ is equal to T ₁ . The second temperature value obtained by the above method is an estimated ambient temperature value. By using the method of estimating the ambient temperature value, the change of wind speed can be made smoother, the user's discomfort can be reduced, and the user experience can be improved. In other embodiments, the second temperature value is equal to the ambient temperature value.

The temperature interval division rule is as follows: the MCU obtains multiple temperature thresholds and divides the interval range according to the temperature thresholds; in different interval ranges, the intervals are divided based on different granularities; when the temperature interval is greater than the first threshold and less than the second threshold, it is divided according to the first granularity; when the temperature interval is greater than the second threshold and less than the third threshold, it is divided according to the second granularity. The first threshold is 14°C, the second threshold is 24°C, the third threshold is 32°C, the first granularity is 1, the second granularity is 2, and the duty cycle division standard is as follows: the temperature value is less than the first threshold, which is the 0 interval; the temperature value is within the first threshold and the second threshold, and the temperature interval is divided into intervals 1 to 10 according to the first granularity; the temperature value is between the second threshold and the third threshold, and the temperature interval is divided into intervals 11 to 14 according to the second granularity; the temperature value is above the third threshold and is divided into intervals 15.

The corresponding relationship between the temperature value and the temperature range is as follows:

Please refer to the smart mode flow chart of the preferred embodiment of the present invention shown in FIG. 3 .

Step S1, when the electric tool is in the smart mode, the temperature sensor detects the current ambient temperature.

Step S2: The MCU receives the current ambient temperature value detected by the temperature sensor.

Step S3: The MCU processes the current ambient temperature value to obtain a second ambient temperature value.

Step S4: The MCU determines the temperature range in which the second temperature value is located, and substitutes it into a formula to calculate a corresponding duty cycle.

Step S5: the MCU controls the operating state of the electric tool according to the calculation result.

其中,

为占空比，l为温度区间。即，风扇在运行过程中可以根据环境温度的变化，实时计算，输出对应的占空比，根据所述占空比控制电机转速，以调节合适的风速。本发明提供的方案可有效避免夜晚温度降低而风速过高的情况出现，解决了人们因夜间风扇风速原因引起的感冒问题。The formula for substituting the temperature interval value into the formula is:

in,

is the duty cycle, and l is the temperature range. That is, during the operation of the fan, the corresponding duty cycle can be calculated in real time according to the change of the ambient temperature, and the motor speed can be controlled according to the duty cycle to adjust the appropriate wind speed. The solution provided by the present invention can effectively avoid the situation where the wind speed is too high when the temperature drops at night, and solves the problem of people catching colds due to the fan speed at night.

The method for obtaining the second temperature value is to intercept two ambient temperature values t ₁ and t ₂ detected by the temperature sensor within a period of time Ｔ during the operation of the smart mode, calculate the slope K of the curve of temperature and time, the formula is K＝(t ₁ -tx)÷Ｔ, and obtain a temperature preset value t ₃ at a future time T ₁ according to the slope K of the curve, the formula is t ₃ ＝t ₂ -K×T ₁ , where Ｔ is equal to T ₁ . The second temperature value obtained by the above method is an estimated ambient temperature value. By using the method of estimating the ambient temperature value, the change of wind speed can be made smoother, reducing the discomfort of the user and improving the user experience. In other embodiments, the second temperature value is equal to the ambient temperature value.

The temperature interval division rule is as follows: the MCU obtains multiple temperature thresholds and divides the interval range according to the temperature thresholds; in different interval ranges, the intervals are divided based on different granularities; when the temperature interval is greater than the first threshold and less than the second threshold, it is divided according to the first granularity; when the temperature interval is greater than the second threshold and less than the third threshold, it is divided according to the second granularity. The first threshold is 14°C, the second threshold is 24°C, the third threshold is 32°C, the first granularity is 1, the second granularity is 2, and the duty cycle division standard is as follows: the temperature value is lower than the first threshold as interval 0; the temperature value is within the first threshold and the second threshold, and the temperature interval is divided into intervals 1 to 10 according to the first granularity; the temperature value is between the second threshold and the third threshold, and the temperature interval is divided into intervals 11 to 14 according to the second granularity; the temperature value is above the third threshold as interval 15.

The corresponding relationship between the temperature value and the temperature range is as follows:

The present invention also provides a wind speed control method, which is applied to an intelligent fan, and the method includes: when the fan is in an intelligent mode, controlling a temperature sensor in the fan to detect an ambient temperature value; receiving the ambient temperature value detected by the temperature sensor; processing the ambient temperature value to obtain a second temperature value, determining a temperature interval into which the second temperature value falls, calculating a corresponding duty cycle according to the temperature interval, and controlling a motor speed according to the corresponding duty cycle; the corresponding duty cycle and the temperature interval present different linear relationships within different temperature intervals, and the duty cycle increases with an increase in the temperature interval.

其中,

为占空比，l为温度区间。即，风扇在运行过程中可以根据环境温度的变化，实时计算，输出对应的占空比，根据所述占空比控制电机转速，以调节合适的风速。本发明提供的方案可有效避免夜晚温度降低而风速过高的情况出现，解决了人们因夜间风扇风速原因引起的感冒问题。The relationship between the duty cycle and the interval is:

in,

is the duty cycle, and l is the temperature range. That is, during the operation of the fan, the corresponding duty cycle can be calculated in real time according to the change of the ambient temperature, and the motor speed can be controlled according to the duty cycle to adjust the appropriate wind speed. The solution provided by the present invention can effectively avoid the situation where the wind speed is too high when the temperature drops at night, and solves the problem of people catching colds due to the fan wind speed at night.

The method for obtaining the second temperature value is to intercept two ambient temperature values t ₁ and t ₂ detected by the temperature sensor within a period of time Ｔ during the operation of the smart mode, calculate the slope K of the curve of temperature and time, the formula is K＝(t ₁ -t ₂ )÷Ｔ, and obtain a temperature preset value t ₃ at a future time T ₁ according to the slope K of the curve, the formula is t ₃ ＝t ₂ -K×T ₁ , where Ｔ is equal to T ₁ . The second temperature value obtained by the above method is an estimated ambient temperature value. By estimating the ambient temperature method, the change of wind speed can be made smoother, reducing the discomfort of the user and improving the user experience. In other embodiments, the second temperature value is equal to the ambient temperature value.

The temperature interval division rule is as follows: the MCU obtains multiple temperature thresholds and divides the interval range according to the temperature thresholds; in different interval ranges, the intervals are divided based on different granularities; when the temperature interval is greater than the first threshold and less than the second threshold, it is divided according to the first granularity; when the temperature interval is greater than the second threshold and less than the third threshold, it is divided according to the second granularity. The first threshold is 14°C, the second threshold is 24°C, the third threshold is 32°C, the first granularity is 1, the second granularity is 2, and the duty cycle division standard is as follows: the temperature value is less than the first threshold as interval 0; the temperature value is within the first threshold and the second threshold, and the temperature interval is divided into intervals 1 to 14 according to the first granularity; the temperature value is between the second threshold and the third threshold, and the temperature interval is divided into intervals 11 to 14 according to the second granularity; the temperature value is above the third threshold as interval 15.

The corresponding relationship between the temperature value and the temperature range is as follows:

Through the above technical solution, a manual and automatic dual-purpose fan is provided to the user. In the manual control mode, the manual knob can be used for stepless speed regulation to control the fan to run to a suitable wind speed. The user can rotate the manual knob to obtain the most suitable wind speed according to his own situation. The stepless speed regulation method adopted here can better meet the needs of users compared with the traditional fixed gear fan. In addition, in the intelligent mode, the user does not need to move to the fan to adjust the gear in person. The fan will perform real-time calculations according to the changes in the ambient temperature to output a suitable duty cycle to control the motor operation to control the fan to adjust to a suitable wind speed. In this mode, it can not only meet the user's demand for intelligent home appliances, but also overcome the problem that the user cannot get up at any time to adjust the fan speed according to the changes in the external temperature when using it in a deep sleep state, avoiding the cold problem caused by the temperature lowering when the user is sleeping at night and the fan running at high speed, and improving the user experience. In addition, in the intelligent mode, by estimating the ambient temperature, the appropriate duty cycle is calculated in advance to adjust to the appropriate wind speed, which can make the wind speed change more gentle, reduce the user's discomfort, and enrich the user experience. Its advantage also lies in that the setting of a manual knob and an automatic switching button allows users to switch freely between manual and automatic modes, meeting the need for manual operation to adjust the wind speed in some situations.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims (10)

1. An electric tool, characterized in that the electric tool comprises: a temperature sensor for detecting ambient temperature; a trigger for switching between a manual mode and an intelligent mode; an MCU for receiving an ambient temperature value detected by the temperature sensor; the MCU processes the ambient temperature value to obtain a second temperature value, determines a temperature interval into which the second temperature value falls, calculates a corresponding duty cycle according to the temperature interval, and controls a motor speed according to the corresponding duty cycle; wherein the corresponding duty cycle and the temperature interval present different linear relationships within different temperature intervals, and the duty cycle increases with an increase in the temperature interval. 2. The electric tool according to claim 1, wherein the relationship between the duty cycle and the temperature range is:

is the duty cycle, l is the temperature range. 3. The electric tool according to claim 1, characterized in that: The MCU obtains multiple temperature thresholds and divides the temperature range according to the temperature thresholds; In different temperature ranges, the temperature ranges are divided based on different particle sizes; When the temperature interval is greater than a first temperature threshold and less than a second temperature threshold, the temperature interval is divided according to a first granularity; When the temperature interval is greater than the second temperature threshold and less than the third temperature threshold, the temperature interval is divided according to the second granularity. 4. The electric tool as described in claim 3 is characterized in that the first granularity is 1, the second granularity is 2, and the duty cycle division standard is: the temperature value is less than the first threshold value as interval 0; the temperature value is within the first threshold value and the second threshold value, and the temperature interval is divided into intervals 1 to 10 according to the first granularity; the temperature value is between the second threshold value and the third threshold value, and the temperature interval is divided into intervals 11 to 14 according to the second granularity; the temperature value is above the third threshold value and is divided into interval 15. 5 . The electric tool according to claim 1 , wherein the second temperature value is equal to the ambient temperature value. 6. A wind speed control method, applied to an intelligent fan, characterized in that the method includes: when the fan is in intelligent mode, controlling a temperature sensor in the fan to detect an ambient temperature value; receiving the ambient temperature value detected by the temperature sensor; processing the ambient temperature value to obtain a second temperature value, determining a temperature interval into which the second temperature value falls, calculating a corresponding duty cycle according to the temperature interval, and controlling a motor speed according to the corresponding duty cycle; the corresponding duty cycle and the temperature interval present different linear relationships within different temperature intervals, and the duty cycle increases with an increase in the temperature interval. 7. The wind speed control method according to claim 6, wherein the relationship between the duty cycle and the temperature range is:

is the duty cycle, l is the temperature range. 8. The wind speed control method according to claim 6, characterized in that the wind speed control method further comprises: The MCU obtains multiple temperature thresholds and divides the temperature range according to the temperature thresholds; In different temperature ranges, the temperature ranges are divided based on different particle sizes; When the temperature interval is greater than a first temperature threshold and less than a second temperature threshold, the temperature interval is divided according to a first granularity; When the temperature interval is greater than the second temperature threshold and less than the third temperature threshold, the temperature interval is divided according to the second granularity. 9. The wind speed control method according to claim 8 is characterized in that the first granularity is 1, the second granularity is 2, and the duty cycle division standard is: the temperature value is less than the first threshold value as interval 0; the temperature value is within the first threshold value and the second threshold value, and the temperature interval is divided into intervals 1 to 10 according to the first granularity; the temperature value is between the second threshold value and the third threshold value, and the temperature interval is divided into intervals 11 to 14 according to the second granularity; the temperature value is above the third threshold value and is divided into interval 15. 10. The wind speed control method according to claim 6, wherein the second temperature value is equal to the ambient temperature value.

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