Intelligent stove valve body opening adjustment system and method

Abstract

The present invention relates to an intelligent stove valve body opening adjustment system, comprising: a valve body, including a valve core; a stepper motor, connected to the valve core, used to drive the valve core to rotate so as to control the size of the stove head fire; a magnetic angle sensor, including a magnet and a sensor, the magnet is installed on the valve core, the sensor is installed outside the valve body, used to detect the rotation angle of the valve core, and convert the rotation angle into an electrical signal; and a controller, the input end of which is connected to the sensor to receive the electrical signal from the magnetic angle sensor, and the output end is connected to the stepper motor to adjust the speed of the stepper motor according to the electrical signal. The present application adopts a non-contact magnetic angle sensor, with a mirror-axis symmetrical strong magnet as a mover placed on the valve core, the sensor is installed on the outside of the valve body, and the signal lead-out end is also on the outside of the valve body, which will not damage the sealing of the valve body structure, and ensures good air tightness of the valve body.

Description

Technical Field

[0001] The present invention relates to the field of intelligent stove control, and in particular to an intelligent stove valve body opening adjustment system and method. Background Art

[0002] With the development of home appliances, Internet+ and Internet of Things products, the market share of smart stoves in the kitchen appliance industry has increased. Smart stove products abandon the traditional stove users' direct manual operation of the mechanical valve core position to change the gas flow to achieve the control of the stove fire size, and use a stepper motor to drive the valve body to achieve the operation of the stove fire size.

[0003] There are two solutions for controlling the valve angle of smart stoves on the market:

[0004] (1) Zero position detection is similar to the inching switch technology. When the valve body structure rotates to a specific position (usually the zero position), the switch is triggered to form a closed electrical circuit, and the signal is led out by the wire. Its disadvantage is that the angle detection range is narrow and generally only one zero position can be detected. Since the mover and the stator need to be in contact to generate a signal, there is a possibility of stalling during use. Long-term use will affect the mechanical structure of the motor. In addition, because there is a harness lead, the air tightness of the entire valve body structure will be reduced.

[0005] (2) Potentiometer detection: a circular carbon brush sliding rheostat is nested in the center of the valve body rotating structure, and the mechanical rotation angle is converted into an analog voltage signal and led out through a wire. The disadvantage is that due to the limitations of the potentiometer carbon brush manufacturing process, the consistency of the potentiometer varies to a certain extent. The long-term mechanical contact and friction between the carbon brush and the conductive coating will affect the overall resistance performance and reduce the service life. In addition, because there is a wire harness lead-out, the air tightness of the entire valve body structure will be reduced. Summary of the invention

[0006] One purpose of the present invention is to solve the technical problems of narrow angle detection range and poor air tightness in the prior art when controlling the valve body angle, and propose an intelligent stove valve body opening adjustment system and method.

[0007] The present invention achieves the above-mentioned purpose through the following technical solutions: an intelligent stove valve body opening adjustment system, comprising: a valve body, including a valve core; a stepper motor, connected to the valve core, used to drive the valve core to rotate so as to control the firepower of the stove head; a magnetic angle sensor, including a magnet and a sensor, the magnet is installed on the valve core, and the sensor is installed outside the valve body, used to detect the rotation angle of the valve core and convert the rotation angle into an electrical signal; and a controller, the input end of which is connected to the sensor to receive the electrical signal from the magnetic angle sensor, and the output end is connected to the stepper motor to adjust the speed of the stepper motor according to the electrical signal.

[0008] Furthermore, the sensor is installed on the outer side of the valve body.

[0009] Furthermore, the sensor is installed at a position directly opposite to the magnet.

[0010] Furthermore, the sensor is installed on the outer side of the valve body at a distance of 1-4 mm from the center of the magnet.

[0011] Furthermore, a control box is provided outside the valve body, the stepper motor and the controller are both installed in the control box, and the controller is electrically connected to the sensor and the stepper motor through wires.

[0012] Furthermore, a sealing isolation ring is provided at the connection between the stepper motor output shaft and the valve core.

[0013] The present invention also proposes a method for adjusting the opening of a smart stove valve body, which is applicable to a smart stove valve body opening adjustment system, comprising: determining a current angle of the valve core based on an output signal received from the sensor; comparing the current angle with a set target angle, and if the current angle is inconsistent with the set target angle, calculating the number of steps the stepper motor needs to move, generating a control signal, and sending the control signal to the stepper motor; and correcting the travel speed of the stepper motor with reference to the angle magnetic field change curve.

[0014] Furthermore, it also includes real-time monitoring of the current angle of the valve core; judging whether the angle change of the valve core tends to the target angle, and if so, reducing the speed of the stepper motor; judging whether the current angle of the valve core reaches the target angle, and if so, stopping the motor from rotating.

[0015] Furthermore, the valve core rotates, driving the magnet to rotate, and the sensor outputs two values ​​in perpendicular directions: X-axis output and Y-axis output. When the magnetic pole of the magnet is facing the sensor, the X-axis output or the Y-axis output is 0. Drawing the angle magnetic field change curve includes: determining the valve core reference point; recording the X-axis output and Y-axis output of the sensor every time the valve core rotates 1°; in the same coordinate system, with the valve core rotation angle as the horizontal coordinate, drawing the change curve of (X-axis output / Y-axis output) and (Y-axis output / X-axis output) when the valve core rotates one circle; taking the one with the smallest absolute value of (X-axis output / Y-axis output) and (Y-axis output / X-axis output) at the same horizontal coordinate to generate the angle magnetic field change curve.

[0016] Furthermore, the step of determining the current angle of the valve core based on the output signal received from the sensor specifically includes: dividing the angle magnetic field change curve into multiple intervals using the maximum point of the angle magnetic field change curve as the dividing point; judging the interval in which the valve core is currently located by combining the sensor output and the angle magnetic field change curve; and searching for the current angle corresponding to the sensor output within the interval in which the valve core is currently located.

[0017] Compared with the prior art, the substantial effects of the present invention are as follows: the present application adopts a non-contact magnetic angle sensor, with a strong magnet with a mirror axis symmetry as a mover placed on the valve core, and the sensor is installed on the outside of the valve body. The signal lead-out end is also on the outside of the valve body, which will not damage the sealing of the valve body structure, thereby ensuring the good airtightness of the valve body; a closed-loop control scheme is adopted for adjusting the angle of the valve core. On the one hand, the operation of the stepper motor is controlled by the corresponding relationship between the change of the valve body angle and the number of steps of the stepper motor. On the other hand, the output of the stepper motor is adjusted in time by the corresponding relationship between the change of the magnetic field and the change of the valve body angle, thereby ensuring the accuracy of the valve body angle adjustment and accurately controlling the valve body opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a system frame of the intelligent stove valve body opening adjustment system of the present invention.

[0019] Figure 2 This is the flow chart 1 of the method for adjusting the opening of the intelligent stove valve body of the present invention.

[0020] Figure 3 This is the flow chart 2 of the method for adjusting the valve opening of the intelligent stove of the present invention.

[0021] Figure 4 This is an initialization calibration diagram of the present invention performed at intervals of 10° rotation of the valve core.

[0022] Figure 5 It is an angular magnetic field variation curve generated by an embodiment of the present invention.

[0023] Figure 6 This is the interval division of the angle magnetic field change curve in the embodiment of the present invention.

[0024] In the figure: 1. stepper motor, 2-1. valve core, 2-2. outer wall of valve body, 3-1. magnet, 3-2. sensor, 4. controller. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings:

[0026] An intelligent stove valve body opening adjustment system Figure 1As shown, it includes: a valve body, a stepper motor 11, a magnetic angle sensor 3-2 and a controller 4. A sealed control box is arranged outside the valve body, and the stepper motor and the controller are installed in the control box. The controller is electrically connected to the sensor and the stepper motor through a wire. One end of the valve body is connected to the air inlet pipeline, and the other end is connected to the air outlet pipeline. The valve body opening represents the fire power of the smart stove burner. The valve body includes a valve core 2-1, and the valve core 2-1 is connected to the stepper motor 1. A sealing isolation ring is provided at the connection between the output shaft of the stepper motor and the valve core to ensure the sealing effect of the control room. The stepper motor 1 drives the valve core 2-1 to rotate so as to control the valve body opening. The magnetic angle sensor includes a magnet 3-1 and a sensor 3-2. The magnet 3-1 is installed on the valve core 2-1. The sensor 3-2 is used to detect the rotation angle of the valve core 2-1 and convert the rotation angle into an electrical signal. Sensor 3-2 is installed on the outside of the valve body, directly opposite to the position of magnet 3-1, 1-4mm away from the center of magnet 3-1. If sensor 3-2 is too close to the center of magnet 3-1, it may increase the manufacturing difficulty. If it is too far from the center of magnet 3-1, it will cause serious distortion of the sampling signal and affect the accuracy of angle detection. The best position is 2mm away from the center of magnet 3-1. When stepper motor 1 is running, it drives valve core 2-1 to rotate and changes the relative position between magnet 3-1 and outer sensor 3-2. Sensor 3-2 generates values ​​in two directions according to the change: X-axis output and Y-axis output. When the magnetic pole of magnet 3-1 is directly opposite to sensor 3-2, X-axis output or Y-axis output is 0.

[0027] The controller input end is connected to the sensor to receive the electrical signal from the sensor, and the output end is connected to the stepper motor to adjust the speed of the stepper motor according to the electrical signal. The controller pre-establishes the angle magnetic field change curve and records the corresponding relationship between the valve core rotation angle and the sensor output signal. First, determine the valve core reference point and perform initialization calibration. Any position can be used as the reference point to record the X-axis output and Y-axis output of the sensor when the valve core rotates 1° or less. In the same coordinate system, the valve core rotation angle is used as the horizontal coordinate to draw the change curve of (X-axis output / Y-axis output) and (Y-axis output / X-axis output) when the valve core rotates one circle. The more calibration points, the higher the angle accuracy. Take the one with the smallest absolute value of (X-axis output / Y-axis output) and (Y-axis output / X-axis output) at the same horizontal coordinate to generate the angle magnetic field change curve.

[0028] like Figure 2 As shown, the method for adjusting the opening of the intelligent stove valve body includes the following steps:

[0029] S10: Determine the current angle of the valve core according to the output signal received from the sensor, such as Figure 3 As shown, specifically including:

[0030] S101: taking the maximum value point of the angle magnetic field change curve as a dividing point, dividing the angle magnetic field change curve into a plurality of intervals;

[0031] S102: Determine the current interval of the valve core by combining the output signal of the sensor and the angle magnetic field change curve;

[0032] S103: Searching for the current angle corresponding to the sensor output within the interval where the valve core is currently located.

[0033] S20: Compare the current angle of the valve core with the set target angle. If the current angle is inconsistent with the set target angle, calculate the number of steps that the stepper motor needs to move, generate a control signal, and send the control signal to the stepper motor; and refer to the angle magnetic field change curve to correct the travel speed of the stepper motor, specifically including:

[0034] Real-time monitoring of the current angle of the valve core;

[0035] Determine whether the change of the valve core angle tends to the target angle, that is, whether the absolute value of the difference between the current angle of the valve core and the target angle is getting smaller and smaller, and if so, reduce the speed of the stepper motor;

[0036] It is determined whether the current angle of the valve core reaches the target angle. If so, the motor stops rotating.

[0037] In this embodiment, the initialization calibration is performed at intervals of 10° rotation of the valve core. Figure 4 As shown, every time the marker rotates 10°, (X-axis output / Y-axis output) and (Y-axis output / X-axis output) are equal. Figure 5 As shown in the figure, the angle magnetic field change curve is generated by taking the minimum absolute value of (X-axis output / Y-axis output) and (Y-axis output / X-axis output) at the same horizontal coordinate. The angle magnetic field change curve is divided into 5 intervals using the maximum value point of the angle magnetic field change curve as the dividing point, as shown in the figure. Figure 6 As shown in Table 1, the value corresponding to the same vertical coordinate may correspond to 4 different angle positions. At this time, the absolute value of the X-axis output and the absolute value of the Y-axis output can be compared to determine the curve interval where the valve core is located. The judgment basis is shown in Table 1:

[0038]

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for adjusting the opening of a valve body of an intelligent stove, characterized in that: The regulation systems used include: Valve body, including valve core; A stepper motor, wherein the output shaft of the stepper motor is connected to the valve core and is used to drive the valve core to rotate so as to control the opening angle of the valve body; A magnetic angle sensor, comprising a magnet and a sensor, wherein the magnet is mounted on the valve core and the sensor is mounted outside the valve body, and is used to detect the rotation angle of the valve core and convert the rotation angle into an electrical signal; and A controller, the input end of which is connected to the sensor and receives the electrical signal from the magnetic angle sensor, and the output end of which is connected to the stepper motor and is used to adjust the speed of the stepper motor according to the electrical signal; The adjustment method comprises the following steps: determining a current angle of the valve core according to an output signal received from the sensor; The current angle of the valve core is compared with the set target angle. If the current angle is inconsistent with the set target angle, the number of steps that the stepper motor needs to move is calculated, a control signal is generated, and the control signal is sent to the stepper motor; and the travel speed of the stepper motor is corrected with reference to the angle magnetic field change curve; Also includes: Real-time monitoring of the current angle of the valve core; Determine whether the change of the valve core angle tends to the target angle, and if so, reduce the speed of the stepper motor; Determine whether the current angle of the valve core reaches the target angle, and if so, stop the motor from rotating; The valve core rotates, driving the magnet to rotate, and the sensor outputs two vertical values: X-axis output and Y-axis output. When the magnetic pole of the magnet faces the sensor, the X-axis output or the Y-axis output is 0. The drawing of the angle magnetic field change curve includes: Determine the valve core reference point; Record the sensor's X-axis output and Y-axis output every time the valve core rotates 1°; In the same coordinate system, with the valve core rotation angle as the horizontal coordinate, draw the change curves of X-axis output / Y-axis output and Y-axis output / X-axis output when the valve core rotates one circle; Take the minimum absolute value of X-axis output / Y-axis output and Y-axis output / X-axis output at the same horizontal coordinate to generate the angle magnetic field change curve; The step of determining the current angle of the valve core according to the output signal received from the sensor specifically includes: The angle magnetic field variation curve is divided into a plurality of intervals by taking the maximum value point of the angle magnetic field variation curve as the dividing point; Combine the sensor output and the angle magnetic field change curve to determine the current range of the valve core; Find the current angle corresponding to the sensor output within the range where the valve core is currently located.

2. The method for adjusting the opening of a valve body of an intelligent stove according to claim 1, characterized in that: The sensor is mounted on the outer side of the valve body.

3. The method for adjusting the opening of a valve body of an intelligent stove according to claim 2, characterized in that: The sensor is installed at a position directly opposite to the magnet.

4. The method for adjusting the opening of a valve body of an intelligent stove according to claim 1, characterized in that: The sensor is mounted on the outer side of the valve body at a distance of 1-4 mm from the center of the magnet.

5. The method for adjusting the opening of a valve body of an intelligent stove according to claim 1, characterized in that: A control box is also provided outside the valve body, and the stepper motor and the controller are both installed in the control box. The controller is electrically connected to the sensor and the stepper motor through a wire.

6. The method for adjusting the opening of a valve body of an intelligent stove according to claim 5, characterized in that: A sealing isolation ring is provided at the connection between the stepper motor output shaft and the valve core.

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