Rotary knob for gas valve

Abstract

Disclosed is a rotary knob for a gas valve, comprising: a rotary knob body (10); a display screen (20), which is provided at the top portion of the rotary knob body (10); a sensor assembly (30), which is provided inside the rotary knob body (10) and configured to sense an instantaneous angular velocity and / or acceleration of the rotary knob body (10); a controller (40), which is configured to calculate a rotation angle of the rotary knob body on the basis of the instantaneous angular velocity and / or acceleration of the rotary knob body sensed by the sensor assembly, so as to determine a rotation angle of the rotary knob body (10) relative to a switch-off position of the gas valve, and, when the rotation angle of the rotary knob body (10) relative to the switch-off position is not 0°, perform countdown on the basis of countdown time, and display the countdown by means of the display screen (20); and a power supply (50), which is electrically connected to the display screen, the sensor assembly and the controller so as to provide electric power. The gas valve can alert a user when the rotary knob body is in not in a switch-off state.

Description

Gas valve knob Technical Field

[0001] The present invention relates to a gas valve knob, and more particularly to a gas valve knob with a timing reminder function, which can determine whether the gas valve is in an open position, count down when the gas valve is in the open position, and remind the user when the countdown time is reached. Background Art

[0002] According to the National Fire Protection Association (NFPA), cooking is the leading cause of home fires, and dry cookware is the leading cause of home fires during cooking. According to statistics, more than 16,000 kitchen fires are caused by dry cookware each year.

[0003] Burning a pot dry is often caused by forgetting to turn off the heat while cooking, allowing the food inside to dry out. Burning a pot dry rapidly heats up, causing a fire and producing a large amount of thick smoke. This smoke can pose a risk of poisoning or suffocation. Therefore, fires caused by burning a pot dry not only result in financial losses but also pose a serious threat to personal safety.

[0004] Currently, the technical means to prevent dry-burning of pots and pans is usually to set a sensor device in the pot to reduce the power or turn off the power before the food is burnt dry. However, this technology only works for pots and pans that use electricity and is not suitable for pots and pans that use open flames.

[0005] The information disclosed in this Background of the Invention section is only intended to enhance understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes the prior art already known to a person skilled in the art.

[0006] Summary of the Invention

[0007] The object of the present invention is to provide a gas valve knob that can solve the above-mentioned problems existing in the prior art.

[0008] To achieve the above objectives, various aspects of the present invention are directed to providing a gas valve knob, which may include: a knob body, a display screen, a sensor assembly, a controller, and a power supply; the display screen may be disposed on the top of the knob body; the sensor assembly is disposed inside the knob body and is configured to sense the instantaneous angular velocity and / or acceleration of the knob body; the controller is configured to calculate the rotation angle of the knob body based on the instantaneous angular velocity and / or acceleration of the knob body sensed by the sensor assembly, thereby determining the rotation angle of the knob body relative to the closed position of the gas valve, and when the rotation angle of the knob body relative to the closed position is not 0°, a countdown is performed according to a countdown time, and the countdown is displayed on the display screen; the power supply is electrically connected to the display screen, the sensor assembly, and the controller to provide power.

[0009] The gas valve knob according to an exemplary embodiment of the present invention may further include a printed circuit board disposed inside the knob body. The sensor assembly and the controller may be disposed on the printed circuit board, respectively. The display screen and the power supply may be electrically connected to the printed circuit board.

[0010] The knob of the gas valve according to the exemplary embodiment of the present invention may further include a buzzer provided inside the knob body and configured to sound an alarm when the countdown time arrives.

[0011] In an exemplary embodiment of the present invention, the sensor assembly may include a gyroscope sensor. The controller may be configured to: integrate the instantaneous angular velocity of the knob body during one rotation, as sensed by the gyroscope sensor, to determine the rotation angle of the knob body after the one rotation; and add the determined rotation angle of the knob body after the one rotation to the angular coordinate of the knob body before the one rotation to calculate the angular coordinate of the knob body after the one rotation.

[0012] In an exemplary embodiment of the present invention, when the knob body is arranged in a horizontal plane, the angular coordinate of the closed position is (0, 0, 0), and when the angular coordinate of the knob body before one rotation is (0, yaw, 0), the controller is configured to calculate the angular coordinate of the knob body after one rotation (0, yaw', 0) according to the following equation:

[0013] Among them, elapsedTime is the time it takes for one rotation, and GyroY is the instantaneous angular velocity of the knob body rotating around the Y axis during one rotation, sensed by the gyroscope sensor.

[0014] In an exemplary embodiment of the present invention, the sensor assembly may include an acceleration sensor, and the controller may be configured to correct the calculated angular coordinates of the knob body after one rotation using the acceleration of the knob body during one rotation sensed by the acceleration sensor.

[0015] In an exemplary embodiment of the present invention, when the knob body is arranged at a certain angle relative to the horizontal plane, the angular coordinate of the closed position is (α, 0, 0), and when the angular coordinate of the knob body before one rotation is (α, yaw, 0), the controller is configured to calculate the angular coordinate of the knob body after one rotation (α, yaw', 0) according to the following equation:

[0016] Among them, elapsedTime is the time it takes for one rotation, and GyroY is the instantaneous angular velocity of the knob body rotating around the Y axis during one rotation, sensed by the gyroscope sensor.

[0017] In an exemplary embodiment of the present invention, the controller may be configured to calculate the correction value accAngleY ​​of the rotation angle of the knob body after one rotation according to the following equation:

[0018] Among them, AccX, AccY, and AccZ are accelerations of the knob body rotating around the X-axis, Y-axis, and Z-axis respectively during one rotation, sensed by the acceleration sensor.

[0019] In an exemplary embodiment of the present invention, the controller may be configured to calculate the final angular coordinate (α, yaw', 0) of the knob body after one rotation according to the following equation: yaw'=E1×yaw'+E2×accAngleY

[0020] Here, E1 and E2 are constants between 0 and 1, and the sum of E1 and E2 is 1.

[0021] The gas valve knob according to an exemplary embodiment of the present invention may further include a communication module disposed on the printed circuit board. When the countdown time is reached, the controller may be configured to generate an alarm message and send the alarm message to an external device via the communication module.

[0022] In an exemplary embodiment of the present invention, the display screen may be a touch display screen for sensing whether the user touches the display screen and setting the countdown time. A touch sensor may be provided in the knob body for sensing whether the user touches the knob body.

[0023] The knob of the gas valve according to the exemplary embodiment of the present invention may further include a temperature sensor provided on the printed circuit board. When the temperature sensed by the temperature sensor exceeds a predetermined temperature, the controller may be configured to control the buzzer to sound an alarm.

[0024] The gas valve knob according to an exemplary embodiment of the present invention may further include a plurality of LEDs provided at the bottom of the knob body. When the countdown time is reached or the temperature sensed by the temperature sensor exceeds a predetermined temperature, the controller may be configured to control the plurality of LEDs to flash.

[0025] The gas valve knob according to an exemplary embodiment of the present invention may further include a voice module provided on the printed circuit board. The controller may be configured to play voice through the voice module to guide the user in installing and using the gas valve knob.

[0026] In an exemplary embodiment of the present invention, when the gas valve is not in the closed position and the user sets a countdown time, the controller can be configured to control the knob of the gas valve to enter a timer mode and count down according to the countdown time set by the user.

[0027] The gas valve knob according to an exemplary embodiment of the present invention may further include a human body sensor for sensing whether a user is near the gas valve. The controller may be configured to determine whether the user is near the gas valve based on at least one of a sensing result of the human body sensor, whether the display screen is touched, whether the knob body is touched, and whether the knob body is rotated.

[0028] In an exemplary embodiment of the present invention, if the gas valve is not in the closed position and the user has not set a countdown time, the controller can be configured to control the gas valve knob to enter automatic mode and count down according to a default countdown time. During the countdown, the controller can be configured to determine whether to terminate the countdown based on whether the user is near the gas valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is an external view showing a knob of a gas valve according to an exemplary embodiment of the present invention;

[0030] FIG2 is an exploded perspective view showing a knob of a gas valve according to an exemplary embodiment of the present invention;

[0031] 3A and 3B are schematic diagrams showing that a knob of a gas valve according to an exemplary embodiment of the present invention is installed on a non-horizontal surface;

[0032] 4 is a control flowchart illustrating a knob of a gas valve according to an exemplary embodiment of the present invention;

[0033] 5 is a control flow chart illustrating an automatic mode of a knob of a gas valve according to an exemplary embodiment of the present invention;

[0034] FIG. 6 is a control flowchart illustrating a timer mode of a knob of a gas valve according to an exemplary embodiment of the present invention.

[0035] It should be understood that the accompanying drawings are not drawn to scale, but rather show various features that illustrate the basic principles of the invention in a slightly simplified manner. In the accompanying drawings of the present invention, the same reference numerals represent the same or equivalent parts of the present invention. DETAILED DESCRIPTION

[0036] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. Although the present invention will be described in conjunction with exemplary embodiments thereof, it will be understood that this description is not intended to limit the present invention to those exemplary embodiments. On the contrary, the present invention is intended to cover not only the exemplary embodiments thereof, but also various alternatives, modifications, equivalents, and other embodiments encompassed within the spirit and scope of the present invention as defined by the appended claims.

[0037] Hereinafter, various exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0038] Figure 1 shows the appearance of a gas valve knob according to an exemplary embodiment of the present invention, and Figure 2 shows an exploded perspective view of the gas valve knob according to an exemplary embodiment of the present invention. The gas valve knob according to an exemplary embodiment of the present invention can replace a conventional gas valve knob and be installed on the D-shaped shaft of a gas valve. It can also be adapted to various types of gas stoves via an adapter. Alternatively, the gas valve knob according to an exemplary embodiment of the present invention can be directly integrated into the gas valve during gas stove production.

[0039] 1 and 2 , the gas valve knob according to an exemplary embodiment of the present invention may include a knob body 10 , a display screen 20 , a sensor assembly 30 , a controller 40 , a power supply 50 , a printed circuit board 60 , a buzzer 70 , a plurality of LEDs 80 , and a switch 90 .

[0040] The knob body 10 can be made of a high-temperature resistant material to withstand high temperatures without melting. The knob body 10 can include an upper cover 11 and a lower cover 12. The lower cover 12 can have a central hollow portion 13 to accommodate the D-shaped shaft of the gas valve. By inserting an adapter 14 into the hollow portion 13, the knob body 10 can be adapted to various types of gas stoves. The upper and lower covers 11, 12 can be connected, for example, by threads.

[0041] The display screen 20 can be provided on the top of the main body cover 11 of the knob body 10 for displaying various information, such as time information, battery power information, and prompt information.

[0042] In an exemplary embodiment, time information in minutes can be displayed in the center of the display screen 20, such as the number "60" displayed on the display screen 20 shown in FIG1 . When the user sets the countdown time, the number "60" can indicate that the currently set countdown time is 60 minutes. When the gas valve is in the closed position, the number "60" can indicate that the default countdown time is 60 minutes. When the gas valve is in the open position and the countdown is in progress, the number "60" can indicate that the current remaining countdown time is 60 minutes.

[0043] In addition, a flashing icon "O" may be displayed above the display time information on the display screen 20. When the countdown time is reached, the flashing icon "O" may flash at a first frequency to visually remind the user.

[0044] The display screen 20 can be further configured as a touch screen display, such as a digital tube, a TN display screen, a dot matrix display screen, a broken code display screen, a TFT display screen, an STN display screen, an LCD display screen, an OLED display screen, an LED display screen, etc., so that the user can set the countdown time by touching the display screen 20. As shown in Figure 1, a symbol "+" for increasing the countdown time and a symbol "-" for decreasing the countdown time can be respectively set at the top and bottom of the display screen 20. Each time the user touches the symbol "+", the countdown time can be increased by one minute, and each time the user touches the symbol "-", the countdown time can be decreased by one minute. Alternatively, the user can long press the symbol "+" or "-" to continuously increase or decrease the countdown time. The minimum value of the countdown time can be 1 minute, and the maximum value can be 99 minutes.

[0045] While the gas valve knob is counting down according to the countdown time, only the flashing icon "O" on the display screen 20 keeps flashing to remind the user that the countdown is in progress. When the countdown enters the last minute, the display screen 20 can remain constantly lit. In addition, in response to the user's touch or the sensor assembly 30 sensing that the knob body 10 is rotated, the display screen 20 can light up, so that the user can know the current countdown time through the time information displayed on the display screen 20, or can set the countdown time through the symbols "+" and "-" set on the display screen 20. When no operation on the gas valve knob is sensed within a predetermined time (for example, 300ms), the display screen 20 can go off. Alternatively, when the controller 40 determines that the gas valve returns to the closed position, the display screen 20 can go off after a predetermined time (for example, 5s).

[0046] The gas valve knob according to an exemplary embodiment of the present invention can count down when the gas valve is in the open position and sound an alarm when the countdown timer expires, reminding the user to turn off the gas, thereby preventing fires caused by dry cooking. To determine whether the gas valve is in the open position, a sensor assembly 30 can be disposed within the knob body 10 to sense the rotation angle of the knob body 10. The controller 40 can determine whether the gas valve is in the closed or open position based on the rotation angle of the knob body 10 sensed by the sensor assembly 30.

[0047] In an exemplary embodiment, the sensor assembly 30 may include a gyro sensor 31 for sensing the instantaneous angular velocity of the knob body 10. The gyro sensor 31 can detect the direction and motion state of an object by sensing the angular velocity in space. Specifically, the gyro sensor 31 can be a three-axis gyro sensor that can accurately measure the angular velocity of an object rotating around three mutually perpendicular axes (X, Y, and Z axes). By measuring the angular velocity of the object's rotation, the object can be accurately positioned. The gyro sensor 31 can output the sensed instantaneous angular velocity of the knob body 10 during one rotation to the controller 40. In order to ensure accurate sensing results, the gyro sensor 31 can be set in the knob body 10 at a position as far away from the D-shaped axis of the gas valve as possible.

[0048] The controller 40 can be configured to calculate the rotation angle of the knob body 10 based on the instantaneous angular velocity of the knob body sensed by the gyro sensor 31, thereby determining the rotation angle of the knob body 10 relative to the closed position of the gas valve. When the rotation angle of the knob body 10 relative to the closed position is not 0°, the controller 40 can count down according to a default countdown time or a user-set countdown time and display the countdown on the display 20. The controller 40 can be a separate control unit located within the knob body 10, or it can be integrated into the control unit of the gas stove.

[0049] The power supply 50 can be electrically connected to the display screen 20, the sensor assembly 30 and the controller 40 to provide power. Preferably, the power supply 50 can be a battery, and a polymer lithium battery with a capacity of more than 300mAh can be used. In this case, as shown in Figure 1, a TYPE-C charging port 15 can be provided on the outer surface of the knob body 10, and the battery can be charged through the TYPE-C charging port 15. When the battery power is low (for example, less than 10%), an icon indicating that the battery power is low can be displayed through the display screen 20. During the battery charging process, an icon indicating that the battery is charging can be displayed through the display screen 20. When the battery power is low (for example, less than 10%), the knob of the gas valve no longer performs the countdown function.

[0050] The printed circuit board 60 may be disposed on the main body lower cover 12 of the knob body 10. The sensor assembly 30 and the controller 40 may be disposed on the printed circuit board 60, respectively. The display screen 20 and the power supply 50 may be electrically connected to the printed circuit board 60, respectively.

[0051] The buzzer 70 can be arranged inside the knob body 10 for sounding an alarm. When the countdown time is reached, the controller 40 can control the buzzer 70 to sound an alarm to remind the user auditorily.

[0052] For example, the buzzer 70 may sound three times in a cycle when the countdown timer is reached, and the buzzer 70 may stop sounding when the controller 40 determines that the gas valve has returned to the closed position. The sounding may continue for a predetermined time (e.g., 3 minutes). When the buzzer 70 continues to sound for more than the predetermined time and the controller 40 determines that the gas valve has not returned to the closed position, the user may be further reminded in other ways described below.

[0053] In addition, the buzzer 70 can sound once when the user rotates the knob body 10 and once when the gas valve returns to the closed position. Further, when the battery is low, the buzzer 70 can sound three times when the user rotates the knob body 10 and three times when the gas valve returns to the closed position.

[0054] In addition to reminding the user through the display screen 20 and the buzzer 70, the knob of the gas valve according to the exemplary embodiment of the present invention can also remind the user in other ways.

[0055] The gas valve knob may further include a communication module (not shown). The communication module may be disposed on a printed circuit board 60 within the knob body 10 or may be disposed elsewhere on the gas stove for communication between the gas valve knob and an external device. The external device may include at least one of a user's portable mobile device (e.g., a mobile phone, tablet computer, wearable device, etc.) and a smart home device (e.g., a smart speaker, etc.).

[0056] Furthermore, the gas valve knob can be connected to the home's smart gateway via a communication module. The communication module can connect to the smart gateway via Wi-Fi, Bluetooth, Zigbee, Zwave, NB-IoT, radio frequency transmission, etc., allowing the gas valve knob to communicate with external devices through the smart gateway.

[0057] Alternatively, the gas valve knob can be connected to a home router via a communication module. The communication module can be connected to the router via Wi-Fi, nb-iot, etc., so that the gas valve knob can communicate with external devices through the router.

[0058] The gas valve knob, connected to the network via a smart gateway or router, can be used to alert the user via an external device, significantly expanding the range of users who can be alerted. Using an external device to alert the user is particularly beneficial in situations where the user cannot hear the buzzer alarm and is not near the gas stove (for example, if the user is hearing-impaired, wearing headphones, in a very noisy environment, or is far from the kitchen).

[0059] When the sound of the buzzer 70 continues for more than a predetermined time and the controller 40 determines that the gas valve has not returned to the closed position, the controller 40 can generate an alarm message and send the generated alarm message to an external device through the communication module to remind the user through the external device. For example, the controller 40 can generate a short message and send the generated short message to a pre-stored phone number through the communication module, or the controller 40 can make a call to a pre-stored phone number through the communication module. The pre-stored phone number can be the user's phone number, or the phone number of the user's family, friends, or colleagues. The controller 40 can also connect to smart home devices in the home through the communication module and provide visual or auditory reminders through the smart home devices, such as through smart speakers and displays in the home.

[0060] The gas valve knob may further include multiple LEDs 80 disposed at the bottom of the knob body 10. The LEDs 80 may be arranged around the outer periphery of the bottom of the knob body 10. When the countdown timer reaches its end or when the temperature sensed by the temperature sensor exceeds a predetermined temperature, the LEDs 80 may flash intermittently to provide a visual reminder to the user. This intermittent flashing of the LEDs 80 is particularly beneficial for users who are unable to hear the buzzer alarm and are near the gas stove. Additionally, the LEDs 80 may remain illuminated continuously when the gas valve is in the open position, enhancing the aesthetics of the gas valve knob.

[0061] The switch 90 may be provided at the bottom of the knob body 10 to turn on or off the power source 50 of the knob of the gas valve.

[0062] In an exemplary embodiment, the gas valve knob may further include a temperature sensor (not shown), which may be disposed on the printed circuit board 60 within the knob body 10. When the pot is large, the bottom of the pot may be close to the knob body 10. If the temperature of the pot bottom is too high, the knob body 10 may melt. Therefore, a temperature sensor is disposed within the knob body 10 to sense the temperature around the knob body 10. When the temperature sensed by the temperature sensor exceeds a predetermined temperature (e.g., 60°C), the controller 40 may control the buzzer 70 to sound an alarm. Simultaneously, the flashing icon "O" on the display screen 20 may flash at a second frequency to provide a visual reminder to the user. The second frequency may be the same as or different from the first frequency.

[0063] In an exemplary embodiment, the gas valve knob may further include a voice module (not shown) disposed on a printed circuit board for playing voice files. When a user first installs and uses the gas valve knob, the controller 40 may play a pre-stored voice file through the voice module to guide the user through the installation and use of the gas valve knob. For example, the voice module may guide the user through network settings for the communication module, initial position calibration of the gyroscope sensor (described below), and setting a default countdown timer.

[0064] In an exemplary embodiment, the gas valve knob may further include a human body sensor (not shown). The human body sensor may include at least one of a human body pyroelectric infrared sensor (PIR) and a microwave sensor. When using the human body pyroelectric infrared sensor, a Fresnel lens is provided on the outer peripheral surface of the knob body 10 to emit infrared rays for sensing the human body.

[0065] In another exemplary embodiment, the human body sensor can be a smart home device located outside the knob of the gas valve, for example, a camera installed in the kitchen. The controller 40 can communicate with the smart home device through the communication module to obtain the position information of the human body in real time.

[0066] In an exemplary embodiment, a touch sensor (not shown) may be provided within the knob body 10. The touch sensor may be a capacitor and may be provided at a location that is easily touched by a user when using the gas valve knob, such as the side of the knob body 10. When the user touches the location of the knob body 10 where the touch sensor is provided, the display screen 20 may light up.

[0067] The gas valve knob according to an exemplary embodiment of the present invention can function as an alarm. While cooking, users may be distracted by other tasks and forget to turn off the stove, potentially leading to dangerous situations. Therefore, an alarm is required to remind users to turn off the stove. When used as an alarm, the controller 40 can control the gas valve knob to enter automatic mode. Automatic mode counts down according to a default countdown time and alerts the user when the default countdown time is reached, preventing users from forgetting to turn off the stove.

[0068] In this case, if it is determined that the user is near the gas valve, it can be assumed that the user is aware of the open state of the gas valve and there is no need to remind the user. Therefore, countdown can be omitted to avoid the inconvenience caused to the user by frequent buzzer alarms.

[0069] The gas valve knob can determine whether a user is near the gas valve in various ways. Specifically, when the user touches the display screen 20 or the area of ​​the knob body 10 where the touch sensor is located, the controller 40 can determine that the user is near the gas valve. Alternatively, when the human body sensor detects that the user is near the gas valve, the controller 40 can determine that the user is near the gas valve. Otherwise, if neither the display screen 20 nor the touch sensor detects the user's touch, and the human body sensor does not detect that the user is near the gas valve, the controller 40 can determine that the user is not near the gas valve. In this case, it can be assumed that the user cannot know whether the gas valve is open, and a reminder is needed. Therefore, a countdown can be performed, and the user can be reminded when the countdown timer expires. During the countdown, if the controller 40 determines that the user is near the gas valve again, the countdown is terminated. It will continue until it is determined that the user has left, at which point the controller 40 restarts the countdown according to the default countdown timer.

[0070] On the other hand, the gas valve knob according to an exemplary embodiment of the present invention can also function as a timer. During cooking, the user may need to use a timer and set the countdown timer according to cooking needs. When used as a timer, the controller 40 can control the gas valve knob to enter timer mode. Timer mode counts down according to the user-set countdown timer and notifies the user when the user-set countdown timer is reached.

[0071] Unlike the automatic mode, in the timer mode, no matter whether the user is around the gas valve or not, as long as the gas valve is in the open position, the controller 40 will count down according to the countdown time set by the user until the user resets the countdown time or the gas valve returns to the closed position.

[0072] A method in which the controller 40 determines the position of the gas valve according to the rotation angle of the knob body 10 sensed by the sensor assembly 30 will be described in detail below.

[0073] When the sensor assembly 30 senses that the knob body 10 is rotated, the controller 40 may integrate the instantaneous angular velocity of the knob body 10 during one rotation output by the sensor assembly 30 to calculate the rotation angle of the knob body 10 after the one rotation.

[0074] Figure 1 shows the XYZ reference coordinate system used by the sensor assembly 30 for sensing. As shown in Figure 1 , when the gas valve knob is installed on the gas valve, the direction indicated when the gas valve is in the closed position serves as the Z-axis direction sensed by the sensor assembly 30, and the angle of rotation about the Z-axis is represented by the roll angle. The direction perpendicular to the Z-axis in the horizontal plane serves as the X-axis direction sensed by the sensor assembly 30, and the angle of rotation about the X-axis is represented by the pitch angle. The direction perpendicular to the horizontal plane serves as the Y-axis direction sensed by the sensor assembly 30, and the angle of rotation about the Y-axis is represented by the yaw angle. The Euler angles (pitch, yaw, and roll) are typically used to represent the angles of rotation about the X, Y, and Z axes sensed by the sensor assembly 30. In the present invention, the Euler angles pitch, yaw, and roll represent the angles of rotation of the knob body 10 about the X, Y, and Z axes, respectively. Euler angles are positive for clockwise rotation about the coordinate axis, and negative for counterclockwise rotation about the coordinate axis.

[0075] In an exemplary embodiment, when the knob body 10 is mounted on a horizontal surface and the gas valve is in the closed position, the angular coordinates of the knob body 10 can be represented as (0, 0, 0). At this point, the knob body 10 can only rotate about the Y-axis. Accordingly, the pitch and roll angles remain at 0, and only the yaw angle changes.

[0076] The controller 40 may calculate the angular coordinate (0, yaw′, 0) of the knob body 10 after one rotation according to the following equation 1:

[0077] Equation 1:

[0078] Among them, the angular coordinates of the knob body 10 before one rotation are (0, yaw, 0), elapsedTime represents the time elapsed for one rotation, and GyroY represents the instantaneous angular velocity of the knob body 10 rotating around the Y axis during one rotation sensed by the gyroscope sensor 31.

[0079] For example, starting from the closed position of the gas valve, the knob body 10 is rotated counterclockwise once. The controller 40 calculates the rotation angle of the knob body 10 after the first rotation based on the instantaneous angular velocity of the knob body 10 sensed by the gyroscope sensor 31 to be -45° (i.e., the knob body 10 rotates 45° counterclockwise around the Y-axis). The angular coordinates of the knob body 10 become (0, -45°, 0). Next, the knob body 10 is rotated clockwise once. The controller 40 calculates the rotation angle of the knob body 10 after the second rotation based on the instantaneous angular velocity of the knob body 10 sensed by the gyroscope sensor 31 to be 45° (i.e., the knob body 10 rotates 45° clockwise around the Y-axis). The angular coordinates of the knob body 10 become (0, 0, 0). Therefore, the controller 40 can determine that the gas valve has returned to the closed position after two rotations.

[0080] As another example, starting from the closed position of the gas valve, the knob body 10 is rotated counterclockwise once. The controller 40 calculates the rotation angle of the knob body 10 after the first rotation based on the instantaneous angular velocity of the knob body 10 sensed by the gyroscope sensor 31 to be -45° (i.e., the knob body 10 rotates 45° counterclockwise around the Y-axis). The angular coordinates of the knob body 10 become (0, -45°, 0). Next, the knob body 10 is rotated counterclockwise once more. The controller 40 calculates the rotation angle of the knob body 10 after the second rotation based on the instantaneous angular velocity of the knob body 10 sensed by the gyroscope sensor 31 to be -30° (i.e., the knob body 10 rotates another 30° counterclockwise around the Y-axis). The angular coordinates of the knob body 10 become (0, -75°, 0). Therefore, the controller 40 can determine that the gas valve is in the open position after two rotations.

[0081] Figures 3A and 3B are schematic diagrams showing that the knob of a gas valve according to an exemplary embodiment of the present invention is installed on a non-horizontal surface. Figure 3A shows that the knob of the gas valve is installed on an inclined surface, and Figure 3B shows that the knob of the gas valve is installed on a vertical surface. As shown in Figures 3A and 3B, in another exemplary embodiment, when the knob of the gas valve is installed on a non-horizontal surface, the knob body 10 is arranged to have a certain angle relative to the horizontal plane, and when the gas valve is in the closed position, the angular coordinates of the knob body 10 can be expressed as (α, 0, 0). Similar to the case of installation on a horizontal surface, the knob body 10 can only rotate around the Y axis. Accordingly, the pitch angle pitch is always α, and the roll angle roll is always 0, and only the yaw angle yaw changes.

[0082] In this case, the sensor assembly 30 may further include an acceleration sensor 32 for sensing the acceleration of the knob body 10. The acceleration sensor 32 is a three-axis acceleration sensor that can accurately measure the acceleration of an object along three mutually perpendicular axes (X, Y, and Z axes). Since the rotation angle of the knob body 10 calculated by the controller 40 through integration operation after one rotation has an error, and the error will become larger as time accumulates, the acceleration of the knob body 10 along the three mutually perpendicular axes (X, Y, and Z axes) during one rotation sensed by the acceleration sensor 32 can be used to correct the rotation angle sensed by the gyroscope sensor 31 to accurately determine the rotation angle of the knob body 10 after one rotation.

[0083] In an exemplary embodiment, the acceleration sensor 32 may be provided adjacent to the gyro sensor 31. The acceleration sensor 32 may output the acceleration sensed by the knob body 10 during one rotation to the controller 40, and the controller 40 may calculate a correction value accAngleY ​​of the rotation angle of the knob body after the one rotation using the acceleration sensed by the acceleration sensor 32.

[0084] Specifically, the controller 40 may first calculate the angular coordinates (α, yaw′, 0) of the knob body 10 after one rotation according to the above equation 1. Then, the controller 40 may calculate the correction value accAngleY ​​for correcting the rotation angle yaw′ of the knob body 10 after one rotation according to the following equation 2.

[0085] Equation 2:

[0086] Wherein, AccX, AccY, and AccZ represent the accelerations of the knob body 10 along the X-axis, Y-axis, and Z-axis directions respectively during one rotation, as sensed by the acceleration sensor 32 .

[0087] Next, the controller 40 may calculate a final rotation angle yaw″ of the knob body 10 after one rotation according to Equation 3 below.

[0088] Equation 3: yaw'=E1×yaw'+E2×accAngleY,

[0089] Wherein, E1 and E2 are constants between 0 and 1, and the sum of E1 and E2 is 1. Preferably, E1 is a value between 0.86 and 0.96, and correspondingly, E2 is a value between 0.14 and 0.04. Preferably, E1 is 0.96 and E2 is 0.04. Therefore, the final angular coordinate of the knob body 10 after one rotation is (α, yaw", 0).

[0090] As an example, the knob body 10 is arranged at an angle of 20° relative to the horizontal plane. That is, when the gas valve is in the closed position, the angular coordinates of the knob body 10 are (20°, 0, 0). Starting from the closed position of the gas valve, the knob body 10 is rotated once counterclockwise. The controller 40 calculates the rotation angle of the knob body 10 after the first rotation based on the instantaneous angular velocity of the knob body 10 sensed by the gyro sensor 31 to be -45° (that is, the knob body 10 rotates 45° counterclockwise around the Y-axis). At the same time, the correction value of the rotation angle of the knob body 10 after the first rotation calculated by the controller 40 based on the acceleration of the knob body 10 sensed by the acceleration sensor 32 is -5°, and the controller 40 can use Equation 3 to calculate the rotation angle of the knob body after the first rotation as: yaw" = 0.96×(-45°)+0.04×(-5°) = -43.4° (E1 = 0.96, E2 = 0.04 in Equation 3). In other words, the corrected angular coordinates of the knob body 10 become (20°, -43.4°, 0).

[0091] Next, the knob body 10 is rotated once in the clockwise direction, and the controller 40 calculates the rotation angle of the knob body 10 after the second rotation based on the instantaneous angular velocity of the knob body 10 sensed by the gyroscope sensor 31 to be 45° (i.e., the knob body 10 rotates 45° clockwise around the Y axis). At the same time, the correction value of the rotation angle of the knob body 10 after the second rotation calculated by the controller 40 based on the acceleration of the knob body 10 sensed by the acceleration sensor 32 is 5°. The controller 40 can use Equation 3 to calculate the rotation angle of the knob body after the second rotation as: yaw" = 0.96 × 45° + 0.04 × 5° = 43.4° (E1 = 0.96, E2 = 0.04 in Equation 3). The controller 40 can calculate the final rotation angle of the gas valve after two rotations as: -43.4° + 43.4° = 0. In other words, the corrected angular coordinates of the knob body 10 become (20°, 0, 0). Therefore, the controller 40 can determine that the gas valve returns to the closed position after two rotations.

[0092] As another example, starting from the closed position of the gas valve, the knob body 10 is rotated once counterclockwise. The controller 40 calculates the rotation angle of the knob body 10 after the first rotation based on the instantaneous angular velocity of the knob body 10 sensed by the gyro sensor 31 to be -45° (i.e., the knob body 10 rotates 45° counterclockwise around the Y-axis). At the same time, the correction value of the rotation angle of the knob body 10 after the first rotation calculated by the controller 40 based on the acceleration of the knob body 10 sensed by the acceleration sensor 32 is -5°. The controller 40 can then calculate the rotation angle of the knob body after the first rotation using Equation 3 as: yaw″ = 0.96×(-45°) + 0.04×(-5°) = -43.4° (E1 = 0.96, E2 = 0.04 in Equation 3). In other words, the corrected angular coordinates of the knob body 10 become (20°, -43.4°, 0).

[0093] Next, the knob body 10 continues to rotate counterclockwise once, and the controller 40 calculates the rotation angle of the knob body 10 after the second rotation based on the instantaneous angular velocity of the knob body 10 sensed by the gyroscope sensor 31 to be -30° (i.e., the knob body 10 continues to rotate 30° counterclockwise around the Y axis). At the same time, the correction value of the rotation angle of the knob body 10 after the second rotation calculated by the controller 40 based on the acceleration of the knob body 10 sensed by the acceleration sensor 32 is -3°. The controller 40 can use Equation 3 to calculate the rotation angle of the knob body after the second rotation as: yaw" = 0.96×(-30°) + 0.04×(-3°) = -28.92° (E1 = 0.96, E2 = 0.04 in Equation 3). The controller 40 can calculate the final rotation angle of the gas valve after two rotations as: -43.4° + (-28.92°) = -72.32°. In other words, the corrected angular coordinates of the knob body 10 become (20°, -72.32°, 0). Therefore, the controller 40 can determine that the gas valve is in the open position after two rotations.

[0094] In another exemplary embodiment, the gyro sensor 31 may be a six-axis gyro sensor. This six-axis gyro sensor integrates a three-axis gyro sensor and a three-axis accelerometer, allowing it to simultaneously sense the instantaneous angular velocity and acceleration of the knob body 10. In this case, the sensor assembly 30 may include only the gyro sensor 31, omitting the accelerometer 32. Based on the instantaneous angular velocity and acceleration of the knob body 10 output by the gyro sensor 31, the controller 40 may calculate the rotation angle of the knob body 10 after one rotation using the method described above for determining the position of the gas valve.

[0095] Therefore, using the above-described method for determining the position of the gas valve, the controller 40 can calculate the angular coordinates of the gas valve after each rotation. Based on the calculated angular coordinates of the gas valve after each rotation, the controller 40 can determine whether the gas valve is in the closed or open position. When the gas valve is in the closed position, the controller 40 can terminate the countdown. When the gas valve is in the open position, the controller 40 can selectively continue the countdown in either automatic mode or timer mode.

[0096] 4 is a flow chart illustrating a control method of a knob of a gas valve according to an exemplary embodiment of the present invention.

[0097] The gyro sensor 31 has an initial position. This initial position refers to the equilibrium point of the voltage, current, and other signals output by the gyro sensor when the gyro sensor is not moving. To ensure accurate sensing results from the gyro sensor, initial position calibration is required. Specifically, initial position calibration can be performed without moving the gyro sensor and without applying any force or vibration.

[0098] Therefore, when the gas valve knob is used for the first time, the gyro sensor 31 within the knob body 10 needs to be calibrated for its initial position. In the present invention, the initial position of the gyro sensor 31 is the closed position of the gas valve. After this initial position calibration, the gyro sensor 31 can sense the rotation of the knob body 10 each time the knob body 10 is rotated. The controller 40 can use the gyro sensor 31 to determine the position of the knob body 10 relative to the closed position after rotation, thereby determining whether the gas valve is in the closed or open position.

[0099] First, in step S101, the switch of the gas valve knob provided at the bottom of the knob body 10 is turned on, and the display screen 20 lights up and displays an icon prompting the user whether to determine the current position as the closed position.

[0100] In step S102, the user can determine the closed position of the gas valve by operating on the display screen 20. As an example, an icon indicating an upward slide can be displayed on the display screen 20, and the user can complete the determination of the closed position by sliding upward on the display screen 20.

[0101] Specifically, after turning on the gas valve knob, install the gas valve knob onto the D-shaped shaft of the gas valve (or install it onto the D-shaped shaft of the gas valve via an adapter). After installation, the user can swipe upward on the display screen 20 to determine the closed position, thereby completing the initial position calibration of the gyro sensor 31. The initial position calibration of the gyro sensor 31 is performed only once each time the gas valve knob is turned on.

[0102] After determining the closed position, the controller 40 may control the gas valve knob to enter a standby mode in step S103. In the standby mode, if no operation on the gas valve knob is sensed within a predetermined time (e.g., 300 ms), the display screen 20 may be turned off. The operation may include, for example, touching the display screen 20, touching the touch sensor, or rotating the knob body 10.

[0103] The gyro sensor is a highly sensitive sensor. After completing the initial position calibration, the gyro sensor can sense a small offset relative to the initial position. In the standby mode, the display screen 20 can light up in response to the gyro sensor sensing an offset relative to the initial position.

[0104] The display screen 20 may display an initial default countdown time. The initial default countdown time refers to a factory-set default countdown time and may be pre-stored in the controller 40. The initial default countdown time may be set to a shorter time than the time that may cause a fire in the case of a dry cookware, such as 10 minutes.

[0105] The user can set the default countdown time by long-pressing the display 20. The default countdown time can be set by touching the location on the display 20 where the time information is displayed for a predetermined time (e.g., 1 second) or longer. The user can increase or decrease the default countdown time by touching the "+" and "-" symbols on the display 20.

[0106] In the standby mode, the sensor assembly 30 may sense the rotation of the knob body 10 , and the controller 40 may determine whether the knob body 10 is rotated based on the output of the sensor assembly 30 , at step S104 .

[0107] When the rotary knob body 10 is rotated (step S104 is yes), in step S105, the controller 40 can determine whether the user has set the countdown time. Specifically, if the user does not modify the countdown time displayed on the display screen 20 by using the symbols "+" and "-" set on the display screen 20, it can be considered that the user does not want to use the timer mode of the gas valve knob. If the user modifies the countdown time displayed on the display screen 20 by using the symbols "+" and "-" set on the display screen 20, it can be considered that the user wants to use the timer mode of the gas valve knob. Accordingly, the controller 40 can control the gas valve knob to enter different modes according to the user's intention. On the other hand, when the rotary knob body 10 is not rotated (step S104 is no), return to step S103 to enter standby mode.

[0108] Specifically, when it is determined that the user has not set the countdown time (No in step S105 ), the controller 40 may control the knob of the gas valve to enter the automatic mode A.

[0109] FIG5 shows a control flow chart of the automatic mode of the knob of the gas valve according to an exemplary embodiment of the present invention. The automatic mode will be described in detail below with reference to FIG5 .

[0110] As shown in FIG. 5 , in the automatic mode, at step S201 , the controller 40 may first determine whether the user has left, and only start the countdown when the user has left.

[0111] Specifically, the controller 40 can determine whether the user is near the gas valve based on at least one of the sensing result of the human body sensor, whether the display screen is touched, whether the knob body is touched, and whether the knob body is rotated. If the user is not near the gas valve, the controller 40 can determine that the user has left (step S201 is yes); if the user is near the gas valve, the controller 40 can determine that the user has not left (step S201 is no).

[0112] When it is determined that the user has left (step S201 is yes), in step S202, the controller 40 may count down according to a default countdown time.

[0113] When it is determined that the user has not left (No in step S201 ), the controller 40 may not start the countdown and wait until the user leaves.

[0114] Specifically, during the countdown according to the default countdown time, at step S203, the controller 40 may determine whether a countdown termination condition is satisfied. The countdown termination condition may include a user appearing around the gas valve.

[0115] When it is determined that the countdown termination condition is satisfied (Yes in step S203 ), the controller 40 may terminate the countdown in step S204 .

[0116] For example, if a user opens a gas valve and no countdown timer is set, the controller 40 may count down according to a default 10-minute countdown timer when it determines that the user has left. During the countdown, if the user appears near the gas valve when the countdown timer reaches 8 minutes, the controller 40 may terminate the ongoing countdown and restart the countdown from 10 minutes when it senses that the user has left again.

[0117] That is, in automatic mode, when it is sensed that the user leaves the vicinity of the gas valve, the controller 40 can automatically count down according to the default countdown time, and when it is sensed that the user returns to the vicinity of the gas valve, the controller 40 can automatically terminate the countdown.

[0118] In addition, if the user sets the countdown time in the automatic mode, the controller 40 controls the knob of the gas valve to enter the timer mode.

[0119] On the other hand, when it is determined that the countdown termination condition is not satisfied (No in step S203 ), the controller 40 may determine whether a default countdown time has been reached in step S205 .

[0120] When it is determined that the default countdown time has been reached (step S205: Yes), in step S206, the controller 40 may remind the user in the various ways described above.

[0121] When it is determined that the default countdown time has not been reached (No in step S205 ), the process returns to step S202 to continue the ongoing countdown.

[0122] On the other hand, when it is determined that the user has set the countdown time (Yes in step S105 ), the controller 40 may control the knob of the gas valve to enter the timer mode B.

[0123] 6 is a control flow chart illustrating a timer mode of a knob of a gas valve according to an exemplary embodiment of the present invention. The timer mode will be described in detail below with reference to FIG.

[0124] As shown in FIG. 6 , in the timer mode, at step S301 , the controller 40 may start countdown according to the countdown time set by the user.

[0125] Specifically, during the countdown according to the countdown time set by the user, the controller 40 may determine, in step S302, whether a countdown termination condition is satisfied. The countdown termination condition may include that the user has reset the countdown time.

[0126] When it is determined that the countdown termination condition is met (step S302 is yes), the process returns to step S301 and counts down according to the countdown time reset by the user.

[0127] When it is determined that the countdown termination condition is not satisfied (No in step S302 ), the controller 40 may determine whether the countdown time set by the user has arrived in step S303 .

[0128] When it is determined that the countdown time set by the user has been reached (step S303: Yes), in step S304, the controller 40 may remind the user in the various ways described above.

[0129] When it is determined that the countdown time set by the user has not been reached (No in step S303 ), the process returns to step S301 to continue the ongoing countdown.

[0130] For example, if a user turns on the gas valve and sets a 10-minute countdown timer, the controller 40 can immediately begin counting down according to the user-set 10-minute countdown timer, regardless of whether the user leaves the gas valve. If the user resets the countdown timer to 5 minutes when the remaining countdown time is 8 minutes, the controller 40 restarts the countdown from the 5-minute timer. Otherwise, as long as the user does not reset the countdown timer during the 10-minute countdown timer, the controller 40 continues counting down regardless of whether the user operates the gas valve knob.

[0131] That is, in the timer mode, no matter whether the user is near the gas valve or not, the countdown will be performed according to the countdown time set by the user.

[0132] In automatic mode and timer mode, each time the user rotates the knob body 10, the controller 40 can calculate the rotation angle of the knob body 10 based on the instantaneous angular velocity and / or acceleration of the knob body 10 sensed by the sensor assembly 30, thereby determining whether the gas valve is in the closed or open position after rotation. If the controller 40 determines that the gas valve has returned to the closed position, it can immediately terminate the countdown and enter standby mode. The method for determining the position of the gas valve has been described above and will not be repeated here.

[0133] The knob of the gas valve according to the exemplary embodiment of the present invention can sense the instantaneous rotation angle of the gas valve through a gyro sensor, and calculate the rotation angle of the gas valve after one rotation based on the sensed instantaneous rotation angle, thereby determining whether the rotated gas valve is in a closed position or an open position.

[0134] The knob of the gas valve according to the exemplary embodiment of the present invention can sense the acceleration of the gas valve through the acceleration sensor, and correct the calculated rotation angle of the gas valve after one rotation based on the sensed acceleration, thereby more accurately determining the rotation angle of the gas valve after one rotation.

[0135] The knob of the gas valve according to the exemplary embodiment of the present invention can count down when the gas valve is in the open position, and remind the user when the countdown time is reached.

[0136] The gas valve knob according to an exemplary embodiment of the present invention can be used as an alarm. When used as an alarm, the knob automatically counts down according to a default countdown timer when it senses the user has left the gas valve. The knob automatically stops the countdown when it senses the user has returned to the gas valve. This reminds the user when the default countdown timer expires, preventing them from forgetting to turn off the gas.

[0137] The knob of a gas valve according to an exemplary embodiment of the present invention can be used as a timer. When used as a timer, the knob counts down according to the user-set countdown time, regardless of whether the user is near the gas valve. The user is notified when the default countdown time is reached.

Claims

1. A gas valve knob, comprising: Knob body; A display screen, which is arranged on the top of the knob body; a sensor assembly disposed inside the knob body and configured to sense an instantaneous angular velocity and / or acceleration of the knob body; a controller configured to calculate the rotation angle of the knob body according to the instantaneous angular velocity and / or acceleration of the knob body sensed by the sensor assembly, thereby determining the rotation angle of the knob body relative to the closed position of the gas valve, and when the rotation angle of the knob body relative to the closed position is not 0°, count down according to the countdown time, and display the countdown on a display screen; as well as A power source is electrically connected to the display screen, the sensor assembly and the controller to provide power.

2. The gas valve knob according to claim 1, further comprising a printed circuit board disposed inside the knob body; in, The sensor assembly and the controller are respectively arranged on the printed circuit board; the display screen and the power supply are respectively electrically connected to the printed circuit board. 3 . The gas valve knob according to claim 1 , further comprising a buzzer which is disposed inside the knob body and configured to sound an alarm when a countdown time is reached.

4. The gas valve knob according to claim 1, wherein: The sensor assembly includes a gyroscope sensor, The controller is configured to: integrate the instantaneous angular velocity of the knob body sensed by the gyroscope sensor during one rotation to determine the rotation angle of the knob body after one rotation, and add the determined rotation angle of the knob body after one rotation to the angular coordinate of the knob body before one rotation to calculate the angular coordinate of the knob body after one rotation.

5. The gas valve knob according to claim 4, wherein: When the knob body is arranged in a horizontal plane, the angular coordinate of the closed position is (0, 0, 0), and when the angular coordinate of the knob body before one rotation is (0, yaw, 0), the controller is configured to calculate the angular coordinate of the knob body after one rotation (0, yaw', 0) according to the following equation: Among them, elapsedTime is the time taken for one rotation, and GyroY is the instantaneous angular velocity of the knob body rotating around the Y axis during one rotation sensed by the gyroscope sensor.

6. The gas valve knob according to claim 4, wherein: The sensor assembly includes an acceleration sensor; The controller is configured to correct the calculated angular coordinates of the knob body after one rotation using the acceleration of the knob body during one rotation sensed by the acceleration sensor.

7. The gas valve knob according to claim 6, wherein: In the case where the knob body is arranged to have a certain angle relative to the horizontal plane, the angular coordinate of the closed position is (α, 0, 0), and when the angular coordinate of the knob body before one rotation is (α, yaw, 0), the controller is configured to calculate the angular coordinate of the knob body after one rotation (α, yaw', 0) according to the following equation: Among them, elapsedTime is the time taken for one rotation, and GyroY is the instantaneous angular velocity of the knob body rotating around the Y axis during one rotation sensed by the gyroscope sensor.

8. The gas valve knob according to claim 7, wherein: The controller is configured to calculate a correction value accAngleY ​​of the rotation angle of the knob body after one rotation according to the following equation: Among them, AccX, AccY, and AccZ are accelerations of the knob body rotating around the X-axis, Y-axis, and Z-axis respectively during one rotation, which are sensed by the acceleration sensor.

9. The gas valve knob according to claim 8, wherein: The controller is configured to calculate the final angular coordinate (α, yaw', 0) of the knob body after one rotation according to the following equation: yaw' = E1 x yaw' + E2 x accAngleY Here, E1 and E2 are constants between 0 and 1, and the sum of E1 and E2 is 1.

10. The gas valve knob according to claim 1, further comprising a communication module, which is disposed on a printed circuit board; When the countdown time is reached, the controller is configured to generate an alarm message and send the alarm message to an external device through the communication module.

11. The knob of the gas valve according to claim 1, wherein the display screen is a touch display screen, used to sense whether the user touches the display screen and set the countdown time; A touch sensor is arranged inside the knob body to sense whether a user touches the knob body.

12. The gas valve knob according to claim 1, further comprising a temperature sensor disposed on a printed circuit board; in, When the temperature sensed by the temperature sensor exceeds a predetermined temperature, the controller is configured to control the buzzer to sound an alarm.

13. The gas valve knob according to claim 1, further comprising a plurality of LEDs disposed at the bottom of the knob body; in, When the countdown time is reached or the temperature sensed by the temperature sensor exceeds a predetermined temperature, the controller is configured to control the plurality of LEDs to flash.

14. The gas valve knob according to claim 1, further comprising a voice module disposed on a printed circuit board, The controller is configured to play voice through the voice module to guide the user to install and use the knob of the gas valve.

15. The gas valve knob according to claim 11, wherein: When the gas valve is not in the closed position and the user sets the countdown time, the controller is configured to control the knob of the gas valve to enter the timer mode and count down according to the countdown time set by the user.

16. The gas valve knob according to claim 11, further comprising a human body sensor, wherein the human body sensor is used to sense whether a user is located around the gas valve; in, The controller is configured to determine whether the user is located around the gas valve according to at least one of a sensing result of the human body sensor, whether the display screen is touched, whether the knob body is touched, and whether the knob body is rotated.

17. The gas valve knob according to claim 16, wherein: When the gas valve is not in the closed position and the user has not set the countdown time, the controller is configured to control the knob of the gas valve to enter the automatic mode and count down according to the default countdown time. During the countdown, the controller is configured to determine whether to terminate the countdown according to whether the user is located around the gas valve.

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