Door cover switch and barrel collision switch detection structure of washing machine and detection method of door cover switch and barrel collision switch detection structure

Abstract

The invention discloses a door cover switch and barrel collision switch detection structure of a washing machine and a detection method thereof. A first magnet is arranged on a door cover of the washing machine, and / or a second magnet is arranged on an outer barrel of the washing machine. The magnetic induction chip and the micro-control unit are arranged on a computer board of the washing machine. The magnetic induction chip is used for detecting magnetic field intensity signals of the first magnet and / or the second magnet in real time, the micro-control unit is used for comparing the detected magnetic field intensity signals with a set threshold value, and therefore the opening and closing state of a door cover of the washing machine and / or the barrel collision state of the washing machine are / is judged. The magnetic induction chip is used for detecting and replacing a mechanical barrel collision switch and / or a reed switch (or a similar magnetic induction switch device) on a traditional washing machine, and the cost of the system is reduced; and the magnetic induction chip can be directly integrated on a computer board of the washing machine, so that wiring harness layout is omitted, the structure is simpler, and the cost of the system is further reduced.

Description

Technical Field

[0001] The present application relates to the field of circuit detection technology, and specifically to a detection structure and a detection method for a door cover switch and a drum switch of a washing machine. Background Art

[0002] At present, the conventional detection method of the washing machine door cover switch is: a reed switch (i.e., a magnetic reed switch, which is an electric switch operated by an applied magnetic field) or a similar magnetic induction switch device is installed on the computer board of the washing machine, and the reed switch or the similar magnetic induction switch device is connected to the computer board through a wiring harness, and a magnet is installed on the washing machine door cover at the same time; when the washing machine door cover is closed, the magnet on the washing machine door cover generates a magnetic force on the reed switch or the similar magnetic induction switch device, thereby turning on the reed switch or the similar magnetic induction switch device, and then outputting a switch signal to the computer board, so as to detect whether the washing machine door cover is in a closed state.

[0003] In addition, the current conventional detection method for a washing machine's barrel crash switch is: install a mechanical barrel crash switch on the washing machine, and connect the mechanical barrel crash switch to the washing machine's computer board through a wiring harness; when the outer barrel deflects significantly and crashes into the barrel, the mechanical barrel crash switch is turned on or off, thereby outputting a switch signal to the computer board to detect whether a barrel crash has occurred.

[0004] However, the conventional method for detecting the door switch of the washing machine and the drum collision of the washing machine uses a reed switch or similar magnetic induction switch device and a mechanical drum collision switch, which is relatively expensive and requires wiring harness connection, resulting in a relatively high cost of the entire machine.

[0005] Therefore, how to improve the detection method of the existing washing machine door cover switch and washing machine drum switch to overcome the above-mentioned shortcomings is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0006] One object of the present application is to provide a low-cost detection structure and method for detecting a door switch and a drum switch of a washing machine.

[0007] To achieve the above objectives, one of the technical solutions adopted in the present application is: a door cover switch detection structure for a washing machine, comprising: a first magnet, which is arranged on the door cover of the washing machine; a magnetic induction chip, which is arranged on the computer board of the washing machine, and the magnetic induction chip is used to detect the first magnetic field strength signal of the first magnet in real time; and a micro control unit, which is arranged on the computer board of the washing machine, and the micro control unit is used to compare the value of the received first magnetic field strength signal with a first threshold; when the value of the first magnetic field strength signal is less than the first threshold, the micro control unit is used to output a washing machine door cover open signal; when the value of the first magnetic field strength signal is greater than or equal to the first threshold, the micro control unit is used to output a washing machine door cover closed signal.

[0008] Preferably, the magnetic induction chip is provided with a first pin, a second pin and a third pin; the first pin is connected to the VSS power supply terminal; the second pin is connected to the micro control unit, and the second pin is connected to the micro control unit and the VSS power supply terminal through a first capacitor; the third pin is connected to the VDD power supply terminal, and the third pin is connected to the VDD power supply terminal and the VSS power supply terminal through a second capacitor.

[0009] Preferably, when the door cover of the washing machine is in a closed state, the magnetic field direction of the first magnet is arranged in a horizontal direction or a vertical direction.

[0010] Preferably, the magnetic induction chip is a magnetic induction chip with switch-type output or a magnetic induction chip with linear output.

[0011] Based on one of the above technical solutions, the present application also provides a detection method for a door cover switch detection structure of a washing machine, comprising the following steps: S101: When the door cover of the washing machine is in a closed state, the magnetic induction chip sets the value of the magnetic field strength signal of the first magnet detected as a first threshold value, and stores the first threshold value in the micro control unit; S102: Before the washing machine is running, the magnetic field strength signal of the first magnet is detected in real time by the magnetic induction chip, and the first magnetic field strength signal is transmitted to the micro control unit; S103: The micro control unit compares the value of the first magnetic field strength signal with the first threshold value; if the value of the first magnetic field strength signal is less than the first threshold value, the micro control unit outputs a washing machine door cover open signal; if the value of the first magnetic field strength signal is greater than or equal to the first threshold value, the micro control unit outputs a washing machine door cover closed signal.

[0012] The second technical solution adopted in the present application is: a drum-collision switch detection structure of a washing machine, comprising: a second magnet, which is arranged on the outer drum of the washing machine; a magnetic induction chip, which is arranged on the computer board of the washing machine, and the magnetic induction chip is used to detect the second magnetic field strength signal of the second magnet in real time; and a microcontroller unit, which is arranged on the computer board of the washing machine, and the microcontroller unit is used to compare the value of the received second magnetic field strength signal with a second threshold value; when the value of the second magnetic field strength signal is greater than or equal to the second threshold value, the microcontroller unit is used to output a drum-collision signal.

[0013] Preferably, the magnetic induction chip is provided with a first pin, a second pin and a third pin; the first pin is connected to the VSS power supply terminal; the second pin is connected to the micro control unit, and the second pin is connected to the micro control unit and the VSS power supply terminal through a first capacitor; the third pin is connected to the VDD power supply terminal, and the third pin is connected to the VDD power supply terminal and the VSS power supply terminal through a second capacitor.

[0014] Preferably, the magnetic field direction of the second magnet is arranged in a direction parallel to or perpendicular to the central axis of the washing machine outer drum, or, when the washing machine outer drum is in the drum-impacting position, the magnetic field direction of the second magnet is arranged in a horizontal direction or a vertical direction.

[0015] Preferably, the magnetic induction chip is a magnetic induction chip with switch-type output or a magnetic induction chip with linear output.

[0016] Based on the second technical solution above, the present application also provides a detection method for a drum switch detection structure of a washing machine, comprising the following steps: S201: When the outer drum of the washing machine is in the drum collision position, the magnetic induction chip sets the value of the magnetic field strength signal of the second magnet detected as a second threshold value, and stores the second threshold value in the micro control unit; S202: During the operation of the washing machine, the second magnetic field strength signal of the second magnet is detected in real time by the magnetic induction chip, and the second magnetic field strength signal is transmitted to the micro control unit; S203: The micro control unit compares the value of the second magnetic field strength signal with the second threshold value; if the value of the second magnetic field strength signal is greater than or equal to the second threshold value, the micro control unit outputs a barrel collision signal.

[0017] The third technical solution adopted in the present application is: a door cover switch and barrel-impact switch detection structure of a washing machine, comprising: a first magnet, which is arranged on the door cover of the washing machine, and the door cover of the washing machine is an upper flip cover structure; a magnetic induction chip, which is arranged on the computer board of the washing machine, and the magnetic induction chip is used to detect the first magnetic field strength signal of the first magnet in real time; and a micro control unit, which is arranged on the computer board of the washing machine, and the micro control unit is used to compare the value of the received first magnetic field strength signal with a first threshold; when the value of the first magnetic field strength signal is less than the first threshold, the micro control unit is used to output a washing machine door cover open signal; when the value of the first magnetic field strength signal is equal to the first threshold, the micro control unit is used to output a washing machine door cover closed signal; when the fluctuation frequency of the value of the first magnetic field strength signal is greater than or equal to the frequency threshold, and / or the fluctuation amplitude of the value of the first magnetic field strength signal is greater than or equal to the amplitude threshold, the micro control unit is used to output a barrel-impact signal.

[0018] Preferably, the magnetic induction chip is provided with a first pin, a second pin and a third pin; the first pin is connected to the VSS power supply terminal; the second pin is connected to the micro control unit, and the second pin is connected to the micro control unit and the VSS power supply terminal through a first capacitor; the third pin is connected to the VDD power supply terminal, and the third pin is connected to the VDD power supply terminal and the VSS power supply terminal through a second capacitor.

[0019] Preferably, when the door cover of the washing machine is in a closed state, the magnetic field direction of the first magnet is arranged in a horizontal direction or a vertical direction.

[0020] Preferably, the magnetic induction chip is a magnetic induction chip with switch-type output or a magnetic induction chip with linear output.

[0021] Based on the third technical solution above, the present application also provides a detection method for a door cover switch and a drum switch detection structure of a washing machine, comprising the following steps: S301: When the door cover of the washing machine is in a closed state, the value of the magnetic field strength signal of the first magnet detected by the magnetic induction chip is set as a first threshold value, and the first threshold value is stored in the micro control unit; when the washing machine is in a drum collision position, the fluctuation frequency of the value of the magnetic field strength signal of the first magnet detected by the magnetic induction chip is set as a frequency threshold value, and / or the fluctuation amplitude of the value of the magnetic field strength signal of the first magnet detected by the magnetic induction chip is set as an amplitude threshold value, and the frequency threshold value and / or the amplitude threshold value are stored in the micro control unit; S302: Detecting a first magnetic field strength signal of the first magnet in real time through the magnetic induction chip, and transmitting the first magnetic field strength signal to the micro control unit; S303: before the washing machine is operated, the micro control unit compares the value of the first magnetic field strength signal with the first threshold value; if the value of the first magnetic field strength signal is less than the first threshold value, the micro control unit outputs a washing machine door cover open signal; if the value of the first magnetic field strength signal is equal to the first threshold value, the micro control unit outputs a washing machine door cover close signal; S304: During the operation of the washing machine, if the fluctuation frequency of the value of the first magnetic field strength signal is greater than or equal to the frequency threshold, and / or the fluctuation amplitude of the value of the first magnetic field strength signal is greater than or equal to the amplitude threshold, the micro control unit outputs a barrel collision signal.

[0022] The fourth technical solution adopted in the present application is: a door cover switch and barrel collision switch detection structure of a washing machine, comprising: a first magnet, which is arranged on the door cover of the washing machine; a second magnet, which is arranged on the outer drum of the washing machine; a magnetic induction chip, which is arranged on the computer board of the washing machine, and the magnetic induction chip is used to detect the superimposed magnetic field strength signals of the first magnet and the second magnet in real time; and a micro control unit, which is arranged on the computer board of the washing machine; the micro control unit is used to compare the value of the received superimposed magnetic field strength signal with a third threshold and a fourth threshold respectively; when the value of the superimposed magnetic field strength signal is less than or greater than the third threshold, the micro control unit is used to output a washing machine door cover open signal; when the value of the superimposed magnetic field strength signal is equal to the third threshold, the micro control unit is used to output a washing machine door cover closed signal; when the value of the superimposed magnetic field strength signal is equal to the fourth threshold, the micro control unit is used to output a barrel collision signal.

[0023] Preferably, the magnetic induction chip is provided with a first pin, a second pin and a third pin; the first pin is connected to the VSS power supply terminal; the second pin is connected to the micro control unit, and the second pin is connected to the micro control unit and the VSS power supply terminal through a first capacitor; the third pin is connected to the VDD power supply terminal, and the third pin is connected to the VDD power supply terminal and the VSS power supply terminal through a second capacitor.

[0024] Preferably, when the door cover of the washing machine is in a closed state, the magnetic field direction of the first magnet is arranged in a horizontal direction or a vertical direction.

[0025] Preferably, the magnetic field direction of the second magnet is arranged in a direction parallel to or perpendicular to the central axis of the washing machine outer drum, or, when the washing machine outer drum is in the drum-impacting position, the magnetic field direction of the second magnet is arranged in a horizontal direction or a vertical direction.

[0026] Preferably, the magnetic induction chip is a magnetic induction chip with switch-type output or a magnetic induction chip with linear output.

[0027] Based on the fourth technical solution above, the present application also provides a detection method for a door cover switch and a drum switch detection structure of a washing machine, comprising the following steps: S401: when the washing machine door cover is in a closed state and the washing machine is in an unstarted state, the value of the superimposed magnetic field strength signal of the first magnet and the second magnet detected by the magnetic induction chip is set as a third threshold value; when the washing machine door cover is in a closed state and the washing machine is in a barrel collision position, the value of the superimposed magnetic field strength signal of the first magnet and the second magnet detected by the magnetic induction chip is set as a fourth threshold value; and the third threshold value and the fourth threshold value are stored in the micro control unit; S402: Detecting the superimposed magnetic field strength signal of the first magnet and the second magnet in real time through the magnetic induction chip, and transmitting the superimposed magnetic field strength signal to the micro control unit; S403: before the washing machine is operated, the microcontroller unit compares the value of the superimposed magnetic field strength signal with the third threshold value; if the value of the superimposed magnetic field strength signal is less than or greater than the third threshold value, the microcontroller unit outputs a washing machine door cover open signal; if the value of the superimposed magnetic field strength signal is equal to the third threshold value, the microcontroller unit outputs a washing machine door cover close signal; S404: During the operation of the washing machine, the micro control unit compares the value of the superimposed magnetic field strength signal with the fourth threshold value; if the value of the superimposed magnetic field strength signal is equal to the fourth threshold value, the micro control unit outputs a barrel collision signal.

[0028] Compared with the prior art, the beneficial effects of the present application are as follows: (1) Since the opening angle of the washing machine door cover determines the distance between the first magnet on the washing machine door cover and the magnetic induction chip on the computer board, the larger the distance, the lower the magnetic field strength detected by the magnetic induction chip. This feature can be used to identify the switch state of the washing machine door cover. Similarly, when the washing machine is in a barrel collision state, that is, the inner drum of the washing machine collides with the outer drum of the washing machine, causing the outer drum of the washing machine to deflect, thereby changing the distance between the second magnet on the outer drum and the magnetic induction chip, the smaller the distance, the greater the magnetic field strength detected by the magnetic induction chip. This feature can be used to identify whether the washing machine has collided with the barrel.

[0029] (2) The present application utilizes a magnetic induction chip for detection to replace the mechanical drum switch and / or reed switch (or similar magnetic induction switch devices) on a traditional washing machine, thereby reducing the cost of the system; and the magnetic induction chip can be directly integrated on the computer board of the washing machine, thereby eliminating the need for wiring harness layout, making the structure simpler, and further reducing the cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the connection between a magnetic induction chip and a micro control unit provided in the present application.

[0031] In the figure: 1. Magnetic induction chip; 2. Micro control unit. DETAILED DESCRIPTION

[0032] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0033] In the description of the present application, it should be noted that for directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions and positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present application. The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. The terms "including" and "having" in the specification and claims of the present application and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device including a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] Embodiment 1

[0035] Reference Figure 1 The present embodiment provides a door cover switch detection structure of a washing machine, comprising a first magnet, a magnetic induction chip 1 and a micro control unit 2; the first magnet is arranged on the door cover of the washing machine; the magnetic induction chip 1 is arranged on the computer board of the washing machine, and the magnetic induction chip 1 is used to detect the first magnetic field strength signal of the first magnet in real time; the micro control unit 2 is arranged on the computer board of the washing machine, and the micro control unit 2 is used to compare the value of the received first magnetic field strength signal with the first threshold value; when the value of the first magnetic field strength signal is less than the first threshold value, the micro control unit 2 is used to output a washing machine door cover open signal; when the value of the first magnetic field strength signal is greater than or equal to the first threshold value, the micro control unit 2 is used to output a washing machine door cover close signal.

[0036] Working principle: Since the installation positions of the first magnet and the magnetic induction chip 1 are fixed, when the washing machine door cover is in the closed state, the value of the first magnetic field strength signal corresponding to the first magnet detected by the magnetic induction chip 1 is fixed (i.e., the first threshold value). After the washing machine door cover is opened, the first magnet is away from the magnetic induction chip 1, and the value of the first magnetic field strength signal corresponding to the first magnet detected by the magnetic induction chip 1 becomes smaller. Therefore, by utilizing the above characteristics, before the washing machine is operated, it is only necessary to use the micro control unit 2 to compare the value of the received first magnetic field strength signal with the first threshold value; if the value of the first magnetic field strength signal is less than the first threshold value, the micro control unit 2 outputs a washing machine door cover opening signal; if the value of the first magnetic field strength signal is greater than or equal to the first threshold value, the micro control unit 2 outputs a washing machine door cover closing signal. Generally, the washing machine will only run the program when the washing machine door cover is in the closed state to ensure the safety of operation. In other words, the magnetic induction chip 1 replaces the reed switch or similar magnetic induction switch device on the traditional washing machine, thereby reducing the cost of the system; and the magnetic induction chip 1 can be directly integrated on the computer board of the washing machine, thereby eliminating the wiring harness layout, making the structure simpler, and further reducing the cost of the system.

[0037] In this embodiment, the magnetic induction chip 1 is a switch-type output magnetic induction chip 1 or a linear output magnetic induction chip 1. The switch-type output magnetic induction chip 1 will output a high-level signal or a low-level signal according to the sensed magnetic induction intensity. The farther the first magnet is from the magnetic induction chip 1, the weaker the magnetic induction intensity. When the magnetic induction intensity is less than the magnetic induction intensity set by the chip, the magnetic induction chip 1 outputs a low-level signal, which corresponds to the output of the washing machine door cover open signal; conversely, when the magnetic induction intensity reaches the magnetic induction intensity set by the chip, the magnetic induction chip 1 outputs a high-level signal, which corresponds to the output of the washing machine door cover closed signal. The linear output magnetic induction chip 1 is also called a continuous magnetic induction chip 1, which will output a continuously changing voltage value according to the sensed magnetic induction intensity. Since the voltage value signal is continuous, the signal is output to the AD port of the micro control unit 2. The micro control unit 2 can sense the change in the output voltage of the magnetic induction chip 1 through the sampled AD value, which corresponds to the change in the distance between the magnet and the magnetic induction chip 1.

[0038] In this embodiment, when the washing machine door cover is in a closed state, the magnetic field direction of the first magnet is preferably arranged in a horizontal direction or a vertical direction. This layout facilitates assembly and control during the production process.

[0039] Based on the first embodiment, a detection method for a door cover switch detection structure of a washing machine is also provided, comprising the following steps: S101: When the door cover of the washing machine is in a closed state, the magnetic induction chip 1 sets the value of the magnetic field strength signal of the first magnet detected as a first threshold value, and stores the first threshold value in the micro control unit 2; S102: Before the washing machine is running, the magnetic field strength signal of the first magnet is detected in real time by the magnetic induction chip 1, and the first magnetic field strength signal is transmitted to the micro control unit 2; S103: The micro control unit 2 compares the value of the first magnetic field strength signal with the first threshold value; if the value of the first magnetic field strength signal is less than the first threshold value, the micro control unit 2 outputs a washing machine door cover open signal; if the value of the first magnetic field strength signal is greater than or equal to the first threshold value, the micro control unit 2 outputs a washing machine door cover closed signal.

[0040] Embodiment 2

[0041] Reference Figure 1 , the difference between this embodiment and the first embodiment is that the magnet is arranged on the outer drum of the washing machine. Specifically, this embodiment provides a drum-collision switch detection structure of a washing machine, including a second magnet, a magnetic induction chip 1 and a micro-control unit 2, wherein the second magnet is arranged on the outer drum of the washing machine; the magnetic induction chip 1 is arranged on the computer board of the washing machine, and the magnetic induction chip 1 is used to detect the second magnetic field strength signal of the second magnet in real time; the micro-control unit 2 is arranged on the computer board of the washing machine, and the micro-control unit 2 is used to compare the value of the received second magnetic field strength signal with the second threshold value; when the value of the second magnetic field strength signal is greater than or equal to the second threshold value, the micro-control unit 2 is used to output a drum-collision signal.

[0042] Working principle: After the installation positions of the second magnet and the magnetic induction chip 1 are fixed, when the washing machine is in a non-barrel collision state, the value of the second magnetic field strength signal detected by the magnetic induction chip 1 corresponding to the second magnet is lower than the second threshold value, and the washing machine is allowed to continue to run; however, when the washing machine is in a barrel collision state, the inner drum of the washing machine deflects too much, and the inner drum of the washing machine pushes the outer drum of the washing machine to deflect, and the second magnet is close to the magnetic induction chip 1, so that the value of the second magnetic field strength signal detected by the magnetic induction chip 1 is greater than or equal to the second threshold value, and then the barrel collision signal is output through the micro control unit 2, so as to control the washing machine to stop running in time to ensure the safety of operation. In other words, the magnetic induction chip 1 replaces the mechanical barrel collision switch on the traditional washing machine, reducing the cost of the system; and the magnetic induction chip 1 can be directly integrated on the computer board of the washing machine, thereby eliminating the wiring harness layout, making the structure simpler, and further reducing the cost of the system.

[0043] In this embodiment, the magnetic field direction of the second magnet is preferably arranged in a direction parallel to or perpendicular to the central axis of the outer drum of the washing machine. This layout facilitates assembly and control during the production process.

[0044] In this embodiment, in order to more accurately detect the drum collision signal, the magnetic field direction of the second magnet can be arranged in the horizontal direction or the vertical direction when the outer drum of the washing machine is in the drum collision position.

[0045] In this embodiment, the magnetic induction chip 1 is a switch-type output magnetic induction chip 1 or a linear output magnetic induction chip 1 .

[0046] Based on the second embodiment, the present application also provides a detection method for a drum switch detection structure of a washing machine, comprising the following steps: S201: When the outer drum of the washing machine is in the drum collision position, the magnetic induction chip 1 sets the value of the magnetic field strength signal of the second magnet detected as a second threshold value, and stores the second threshold value in the micro control unit 2; S202: During the operation of the washing machine, the second magnetic field strength signal of the second magnet is detected in real time by the magnetic induction chip 1, and the second magnetic field strength signal is transmitted to the micro control unit 2; S203: The micro control unit 2 compares the value of the second magnetic field strength signal with the second threshold value; if the value of the second magnetic field strength signal is greater than or equal to the second threshold value, the micro control unit 2 outputs a barrel collision signal.

[0047] Embodiment 3

[0048] Reference Figure 1 The present embodiment provides a door cover switch and barrel-impact switch detection structure of a washing machine, comprising a first magnet, a magnetic induction chip 1 and a microcontroller unit 2, wherein the first magnet is arranged on the door cover of the washing machine, and the door cover of the washing machine is an upper flip cover structure; the magnetic induction chip 1 is arranged on the computer board of the washing machine, and the magnetic induction chip 1 is used to detect the first magnetic field strength signal of the first magnet in real time; the microcontroller unit 2 is arranged on the computer board of the washing machine, and the microcontroller unit 2 is used to compare the value of the received first magnetic field strength signal with the first threshold value; when the value of the first magnetic field strength signal is less than the first threshold value, the microcontroller unit 2 is used to output a washing machine door cover opening signal; when the value of the first magnetic field strength signal is equal to the first threshold value, the microcontroller unit 2 is used to output a washing machine door cover closing signal; when the fluctuation frequency of the value of the first magnetic field strength signal is greater than or equal to the frequency threshold value, and / or the fluctuation amplitude of the value of the first magnetic field strength signal is greater than or equal to the amplitude threshold value, the microcontroller unit 2 is used to output a barrel-impact signal.

[0049] Working principle: Before the washing machine is operated, the principle of judging the switch status of the washing machine door cover is the same as that of the first embodiment, and will not be described in detail here. During the operation of the washing machine, the greater the deflection angle of the inner drum of the washing machine, the stronger the vibration of the washing machine. For a washing machine with an upper cover, the washing machine door cover is naturally closed under the action of gravity. After being vibrated, the washing machine door cover will jump. The stronger the vibration, the more obvious the jumping (that is, the higher the jumping frequency, the larger the jumping amplitude). Therefore, this feature can be used to identify whether the washing machine hits the barrel. In other words, the magnetic induction chip 1 replaces the mechanical barrel-collision switch and the reed switch (or similar magnetic induction switch device) on the traditional washing machine, thereby reducing the cost of the system; and the magnetic induction chip 1 can be directly integrated on the computer board of the washing machine, thereby eliminating the wiring harness layout, making the structure simpler, and further reducing the cost of the system.

[0050] It is understandable that the beating frequency of the washing machine door cover can be used to identify whether it hits the barrel, that is, the higher the beating frequency, the higher the fluctuation frequency of the value of the first magnetic field strength signal. When the frequency threshold set in the barrel state is reached, the barrel collision signal can be output. Similarly, the beating amplitude of the washing machine door cover can also be used to identify whether it hits the barrel, that is, the larger the amplitude of the beating (that is, the larger the opening angle of the washing machine door cover), the farther the first magnet is from the magnetic induction chip 1. At this time, the magnetic induction chip 1 with linear output is used for detection, that is, the farther the distance between the first magnet and the magnetic induction chip 1, the greater the fluctuation amplitude of the value of the first magnetic field strength signal. When the amplitude threshold set in the barrel collision state is reached, the barrel collision signal can be output. Of course, the fluctuation frequency of the value of the first magnetic field strength signal and the fluctuation amplitude of the value of the first magnetic field strength signal can also be combined to identify whether it hits the barrel, that is, the fluctuation frequency of the value of the first magnetic field strength signal reaches the frequency threshold, and the fluctuation amplitude of the value of the first magnetic field strength signal reaches the amplitude threshold, the barrel collision signal will be output.

[0051] It should be understood that the fluctuation frequency of the value of the first magnetic field strength signal can be represented by the number of times the microcontroller unit 2 outputs the washing machine door cover closing signal per unit time, or the number of times the microcontroller unit 2 outputs the washing machine door cover opening signal per unit time, or the number of times the microcontroller unit 2 alternately outputs the washing machine door cover opening signal and the washing machine door cover closing signal per unit time. The fluctuation amplitude of the value of the first magnetic field strength signal is related to the opening angle of the washing machine door cover. The larger the opening angle, the farther the first magnet is from the magnetic induction chip 1, and the greater the fluctuation amplitude of the value of the first magnetic field strength signal.

[0052] In this embodiment, when the washing machine door cover is in a closed state, the magnetic field direction of the first magnet is preferably arranged in a horizontal direction or a vertical direction. This layout facilitates assembly and control during the production process.

[0053] In this embodiment, the magnetic induction chip 1 is a switch-type output magnetic induction chip 1 or a linear output magnetic induction chip 1. It should be understood that when the feature of the fluctuation amplitude of the value of the first magnetic field strength signal is needed to identify whether the barrel is hit, a linear output magnetic induction chip 1 is needed.

[0054] Based on the third embodiment, the present application also provides a detection method for a door cover switch and a drum switch detection structure of a washing machine, comprising the following steps: S301: When the door cover of the washing machine is in a closed state, the value of the magnetic field strength signal of the first magnet detected by the magnetic induction chip 1 is set as a first threshold value, and the first threshold value is stored in the micro control unit 2; when the washing machine is in a drum collision position, the fluctuation frequency of the value of the magnetic field strength signal of the first magnet detected by the magnetic induction chip 1 is set as a frequency threshold value, and / or the fluctuation amplitude of the value of the magnetic field strength signal of the first magnet detected by the magnetic induction chip 1 is set as an amplitude threshold value, and the frequency threshold value and / or the amplitude threshold value are stored in the micro control unit 2; S302: Detecting a first magnetic field strength signal of a first magnet in real time through the magnetic induction chip 1, and transmitting the first magnetic field strength signal to the micro control unit 2; S303: Before the washing machine is running, the micro control unit 2 compares the value of the first magnetic field strength signal with the first threshold value; if the value of the first magnetic field strength signal is less than the first threshold value, the micro control unit 2 outputs a washing machine door cover open signal; if the value of the first magnetic field strength signal is equal to the first threshold value, the micro control unit 2 outputs a washing machine door cover close signal; S304: During the operation of the washing machine, if the fluctuation frequency of the value of the first magnetic field strength signal is greater than or equal to the frequency threshold, and / or the fluctuation amplitude of the value of the first magnetic field strength signal is greater than or equal to the amplitude threshold, the micro control unit 2 outputs a barrel collision signal.

[0055] Embodiment 4

[0056] Reference Figure 1The present embodiment provides a door cover switch and barrel knock switch detection structure of a washing machine, comprising a first magnet, a second magnet, a magnetic induction chip 1 and a micro control unit 2; the first magnet is arranged on the door cover of the washing machine; the second magnet is arranged on the outer drum of the washing machine; the magnetic induction chip 1 is arranged on the computer board of the washing machine, and the magnetic induction chip 1 is used to detect the superimposed magnetic field strength signals of the first magnet and the second magnet in real time; the micro control unit 2 is arranged on the computer board of the washing machine; the micro control unit 2 is used to compare the value of the received superimposed magnetic field strength signal with a third threshold value and a fourth threshold value respectively; when the value of the superimposed magnetic field strength signal is less than or greater than the third threshold value, the micro control unit 2 is used to output a washing machine door cover open signal; when the value of the superimposed magnetic field strength signal is equal to the third threshold value, the micro control unit 2 is used to output a washing machine door cover close signal; when the value of the superimposed magnetic field strength signal is equal to the fourth threshold value, the micro control unit 2 is used to output a barrel knock signal.

[0057] Working principle: This embodiment uses a first magnet installed on the door cover of the washing machine, and a second magnet installed on the outer drum of the washing machine, and then uses a magnetic induction chip 1 to detect the superimposed magnetic field strength signal of the first magnet and the second magnet, so as to identify the switch state and the drum collision state of the door cover of the washing machine. Before the washing machine is running, since the inner drum of the washing machine will not rotate, that is, the position of the second magnet on the outer drum is fixed, at this time, the position of the washing machine door cover determines the strength of the superimposed magnetic field. Therefore, it is only necessary to set the value of the detected superimposed magnetic field strength signal to the third threshold when the inner drum does not rotate and the door cover of the washing machine is in a closed state. When the value of the detected real-time superimposed magnetic field strength signal is equal to the third threshold, it can be reflected that the door cover of the washing machine is in a closed state. Similarly, during the operation of the washing machine, since the door cover of the washing machine is in a closed state (applicable to washing machines with locking structures or damping structure door covers to prevent vibration from causing errors caused by the jumping of the door cover of the washing machine), that is, the position of the first magnet on the door cover of the washing machine is fixed. At this time, the position of the outer drum determines the strength of the superimposed magnetic field. Therefore, it is only necessary to set the value of the superimposed magnetic field strength signal corresponding to the barrel collision state to the fourth threshold value. When the value of the superimposed magnetic field strength signal detected in real time is equal to the fourth threshold value, it can be reflected that the washing machine is in the barrel collision state. In other words, the magnetic induction chip 1 replaces the mechanical barrel collision switch and the reed switch (or similar magnetic induction switch device) on the traditional washing machine, thereby reducing the cost of the system; and the magnetic induction chip 1 can be directly integrated on the computer board of the washing machine, thereby eliminating the wiring harness layout, making the structure simpler, and further reducing the cost of the system.

[0058] In this embodiment, when the washing machine door cover is in a closed state, the magnetic field direction of the first magnet is preferably arranged in a horizontal direction or a vertical direction. This layout facilitates assembly and control during the production process.

[0059] In this embodiment, the magnetic field direction of the second magnet is preferably arranged in a direction parallel to or perpendicular to the central axis of the outer drum of the washing machine. This layout facilitates assembly and control during the production process.

[0060] In this embodiment, in order to more accurately detect the drum collision signal, the magnetic field direction of the second magnet can be arranged in the horizontal direction or the vertical direction when the outer drum of the washing machine is in the drum collision position.

[0061] In this embodiment, the magnetic induction chip 1 is a switch-type output magnetic induction chip 1 or a linear output magnetic induction chip 1 .

[0062] Based on the fourth embodiment, the present application also provides a detection method for a door cover switch and a drum switch detection structure of a washing machine, characterized in that it includes the following steps: S401: when the washing machine door cover is in a closed state and the washing machine is in an unstarted state, the value of the superimposed magnetic field strength signal of the first magnet and the second magnet detected by the magnetic induction chip 1 is set as a third threshold value; when the washing machine door cover is in a closed state and the washing machine is in a barrel collision position, the value of the superimposed magnetic field strength signal of the first magnet and the second magnet detected by the magnetic induction chip 1 is set as a fourth threshold value; and the third threshold value and the fourth threshold value are stored in the micro control unit 2; S402: Detecting the superimposed magnetic field strength signal of the first magnet and the second magnet in real time through the magnetic induction chip 1, and transmitting the superimposed magnetic field strength signal to the micro control unit 2; S403: before the washing machine is running, the micro control unit 2 compares the value of the superimposed magnetic field strength signal with the third threshold value; if the value of the superimposed magnetic field strength signal is less than or greater than the third threshold value, the micro control unit 2 outputs a washing machine door cover open signal; if the value of the superimposed magnetic field strength signal is equal to the third threshold value, the micro control unit 2 outputs a washing machine door cover close signal; S404: During the operation of the washing machine, the micro control unit 2 compares the value of the superimposed magnetic field strength signal with the fourth threshold value; if the value of the superimposed magnetic field strength signal is equal to the fourth threshold value, the micro control unit 2 outputs a drum collision signal.

[0063] In any embodiment of the present application, Figure 1As shown, the magnetic induction chip 1 is provided with a first pin, a second pin and a third pin; the first pin is connected to the VSS power supply terminal; the second pin is connected to the micro control unit 2, and the second pin and the micro control unit 2 are connected to the VSS power supply terminal through the first capacitor; the third pin is connected to the VDD power supply terminal, and the third pin and the VDD power supply terminal are connected to the VSS power supply terminal through the second capacitor. When the VDD power supply terminal and the VSS power supply terminal are used for power supply, the electrical signal (i.e., the first magnetic field strength signal) generated by the magnetic induction chip 1 when it is subjected to the magnetic field will be transmitted to the micro control unit 2 (i.e., MCU) through the second pin, and the micro control unit 2 can process the received electrical signal and make corresponding judgments.

[0064] In some embodiments of the present application, the gap size of each washing machine may be different due to production errors. For this reason, when the door cover of the washing machine is in a closed and static state, the output value of the magnetic induction chip 1 is calibrated to zero, thereby equivalently removing the bias value to prevent system misjudgment due to gap errors.

[0065] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of protection claimed by the present application. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A door cover switch detection structure for a washing machine, characterized in that: include: A first magnet, wherein the first magnet is disposed on a door cover of the washing machine; A magnetic induction chip, the magnetic induction chip is arranged on a computer board of the washing machine, and the magnetic induction chip is used to detect a first magnetic field strength signal of the first magnet in real time; as well as A microcontrol unit, wherein the microcontrol unit is arranged on a computer board of a washing machine, and the microcontrol unit is used to compare the value of the received first magnetic field strength signal with a first threshold value; when the value of the first magnetic field strength signal is less than the first threshold value, the microcontrol unit is used to output a washing machine door cover open signal; when the value of the first magnetic field strength signal is greater than or equal to the first threshold value, the microcontrol unit is used to output a washing machine door cover closed signal.

2. The door cover switch detection structure of the washing machine according to claim 1, characterized in that: The magnetic induction chip is provided with a first pin, a second pin and a third pin; the first pin is connected to the VSS power supply terminal; the second pin is connected to the micro control unit, and the second pin is connected to the micro control unit and the VSS power supply terminal through a first capacitor; the third pin is connected to the VDD power supply terminal, and the third pin is connected to the VDD power supply terminal and the VSS power supply terminal through a second capacitor.

3. The door cover switch detection structure of the washing machine according to claim 1 or 2, characterized in that: When the washing machine door cover is in a closed state, the magnetic field direction of the first magnet is arranged in a horizontal direction or a vertical direction; And / or, the magnetic induction chip is a magnetic induction chip with switch-type output or a magnetic induction chip with linear output.

4. The detection method of the door cover switch detection structure of the washing machine according to any one of claims 1 to 3, characterized in that: The following steps are involved: S101: When the door cover of the washing machine is in a closed state, the magnetic induction chip sets the value of the magnetic field strength signal of the first magnet detected as a first threshold value, and stores the first threshold value in the micro control unit; S102: Before the washing machine is running, the magnetic field strength signal of the first magnet is detected in real time by the magnetic induction chip, and the first magnetic field strength signal is transmitted to the micro control unit; S103: The micro control unit compares the value of the first magnetic field strength signal with the first threshold value; if the value of the first magnetic field strength signal is less than the first threshold value, the micro control unit outputs a washing machine door cover open signal; if the value of the first magnetic field strength signal is greater than or equal to the first threshold value, the micro control unit outputs a washing machine door cover closed signal.

5. The drum-bumping switch detection structure of the washing machine is characterized in that: include: A second magnet, wherein the second magnet is disposed on the outer drum of the washing machine; A magnetic induction chip, the magnetic induction chip is arranged on a computer board of the washing machine, and the magnetic induction chip is used to detect a second magnetic field strength signal of the second magnet in real time; as well as A micro control unit is arranged on a computer board of the washing machine, and is used for comparing the value of the received second magnetic field strength signal with a second threshold value; when the value of the second magnetic field strength signal is greater than or equal to the second threshold value, the micro control unit is used for outputting a barrel collision signal.

6. The drum-slam switch detection structure of a washing machine according to claim 5, characterized in that: The magnetic induction chip is provided with a first pin, a second pin and a third pin; the first pin is connected to the VSS power supply terminal; the second pin is connected to the micro control unit, and the second pin is connected to the micro control unit and the VSS power supply terminal through a first capacitor; the third pin is connected to the VDD power supply terminal, and the third pin is connected to the VDD power supply terminal and the VSS power supply terminal through a second capacitor.

7. The drum knock switch detection structure of a washing machine according to claim 5 or 6, characterized in that: The magnetic field direction of the second magnet is arranged in a direction parallel to or perpendicular to the central axis of the outer drum of the washing machine, or, when the outer drum of the washing machine is in the drum-impacting position, the magnetic field direction of the second magnet is arranged in a horizontal direction or a vertical direction; And / or, the magnetic induction chip is a magnetic induction chip with switch-type output or a magnetic induction chip with linear output.

8. The detection method of the drum switch detection structure of a washing machine according to any one of claims 5 to 7, characterized in that: The following steps are involved: S201: When the outer drum of the washing machine is in the drum collision position, the magnetic induction chip sets the value of the magnetic field strength signal of the second magnet detected as a second threshold value, and stores the second threshold value in the micro control unit; S202: During the operation of the washing machine, the second magnetic field strength signal of the second magnet is detected in real time by the magnetic induction chip, and the second magnetic field strength signal is transmitted to the micro control unit; S203: The micro control unit compares the value of the second magnetic field strength signal with the second threshold value; if the value of the second magnetic field strength signal is greater than or equal to the second threshold value, the micro control unit outputs a barrel collision signal.

9. The door cover switch and drum switch detection structure of the washing machine is characterized in that: include: A first magnet, wherein the first magnet is arranged on a door cover of a washing machine, and the door cover of the washing machine is an upward flip cover structure; A magnetic induction chip, the magnetic induction chip is arranged on a computer board of the washing machine, and the magnetic induction chip is used to detect a first magnetic field strength signal of the first magnet in real time; as well as A microcontrol unit, wherein the microcontrol unit is arranged on a computer board of a washing machine, and the microcontrol unit is used to compare the value of the first magnetic field strength signal received with a first threshold value; when the value of the first magnetic field strength signal is less than the first threshold value, the microcontrol unit is used to output a washing machine door cover open signal; when the value of the first magnetic field strength signal is equal to the first threshold value, the microcontrol unit is used to output a washing machine door cover closed signal; when the fluctuation frequency of the value of the first magnetic field strength signal is greater than or equal to the frequency threshold value, and / or the fluctuation amplitude of the value of the first magnetic field strength signal is greater than or equal to the amplitude threshold value, the microcontrol unit is used to output a barrel collision signal.

10. The door cover switch and drum switch detection structure of the washing machine according to claim 9, characterized in that: The magnetic induction chip is provided with a first pin, a second pin and a third pin; the first pin is connected to the VSS power supply terminal; the second pin is connected to the micro control unit, and the second pin is connected to the micro control unit and the VSS power supply terminal through a first capacitor; the third pin is connected to the VDD power supply terminal, and the third pin is connected to the VDD power supply terminal and the VSS power supply terminal through a second capacitor.

11. The door cover switch and drum switch detection structure of a washing machine according to claim 9 or 10, characterized in that: When the washing machine door cover is in a closed state, the magnetic field direction of the first magnet is arranged in a horizontal direction or a vertical direction; And / or, the magnetic induction chip is a magnetic induction chip with switch-type output or a magnetic induction chip with linear output.

12. The detection method of the door cover switch and drum switch detection structure of the washing machine according to any one of claims 9 to 11, characterized in that: The following steps are involved: S301: When the door cover of the washing machine is in a closed state, the magnetic induction chip sets the value of the magnetic field strength signal of the first magnet detected as a first threshold value, and stores the first threshold value in the micro control unit; When the washing machine is in the drum collision position, the fluctuation frequency of the value of the magnetic field strength signal of the first magnet detected by the magnetic induction chip is set as a frequency threshold, and / or the fluctuation amplitude of the value of the magnetic field strength signal of the first magnet detected by the magnetic induction chip is set as an amplitude threshold, and the frequency threshold and / or the amplitude threshold are stored in the micro control unit; S302: Detecting a first magnetic field strength signal of the first magnet in real time through the magnetic induction chip, and transmitting the first magnetic field strength signal to the micro control unit; S303: before the washing machine is operated, the micro control unit compares the value of the first magnetic field strength signal with the first threshold value; if the value of the first magnetic field strength signal is less than the first threshold value, the micro control unit outputs a washing machine door cover open signal; if the value of the first magnetic field strength signal is equal to the first threshold value, the micro control unit outputs a washing machine door cover close signal; S304: During the operation of the washing machine, if the fluctuation frequency of the value of the first magnetic field strength signal is greater than or equal to the frequency threshold, and / or the fluctuation amplitude of the value of the first magnetic field strength signal is greater than or equal to the amplitude threshold, the micro control unit outputs a barrel collision signal.

13. The door cover switch and drum switch detection structure of the washing machine is characterized in that: include: A first magnet, wherein the first magnet is disposed on a door cover of the washing machine; A second magnet, wherein the second magnet is disposed on the outer drum of the washing machine; A magnetic induction chip, which is disposed on a computer board of the washing machine and is used to detect in real time the superimposed magnetic field strength signals of the first magnet and the second magnet; as well as A microcontrol unit, wherein the microcontrol unit is arranged on a computer board of a washing machine; the microcontrol unit is used to compare the value of the received superimposed magnetic field strength signal with a third threshold value and a fourth threshold value respectively; when the value of the superimposed magnetic field strength signal is less than or greater than the third threshold value, the microcontrol unit is used to output a washing machine door cover open signal; when the value of the superimposed magnetic field strength signal is equal to the third threshold value, the microcontrol unit is used to output a washing machine door cover closed signal; when the value of the superimposed magnetic field strength signal is equal to the fourth threshold value, the microcontrol unit is used to output a barrel collision signal.

14. The door cover switch and drum switch detection structure of the washing machine according to claim 13, characterized in that: The magnetic induction chip is provided with a first pin, a second pin and a third pin; the first pin is connected to the VSS power supply terminal; the second pin is connected to the micro control unit, and the second pin is connected to the micro control unit and the VSS power supply terminal through a first capacitor; the third pin is connected to the VDD power supply terminal, and the third pin is connected to the VDD power supply terminal and the VSS power supply terminal through a second capacitor.

15. The door cover switch and drum switch detection structure of a washing machine according to claim 13 or 14, characterized in that: When the washing machine door cover is in a closed state, the magnetic field direction of the first magnet is arranged in a horizontal direction or a vertical direction; And / or, the magnetic field direction of the second magnet is arranged in a direction parallel to or perpendicular to the central axis of the outer drum of the washing machine, or, when the outer drum of the washing machine is in the drum-impacting position, the magnetic field direction of the second magnet is arranged in a horizontal direction or a vertical direction; And / or, the magnetic induction chip is a magnetic induction chip with switch-type output or a magnetic induction chip with linear output.

16. The detection method of the door cover switch and drum switch detection structure of the washing machine according to any one of claims 13 to 15, characterized in that: The following steps are involved: S401: when the washing machine door cover is in a closed state and the washing machine is in an unstarted state, the value of the superimposed magnetic field strength signal of the first magnet and the second magnet detected by the magnetic induction chip is set as a third threshold value; when the washing machine door cover is in a closed state and the washing machine is in a barrel collision position, the value of the superimposed magnetic field strength signal of the first magnet and the second magnet detected by the magnetic induction chip is set as a fourth threshold value; and the third threshold value and the fourth threshold value are stored in the micro control unit; S402: Detecting the superimposed magnetic field strength signal of the first magnet and the second magnet in real time through the magnetic induction chip, and transmitting the superimposed magnetic field strength signal to the micro control unit; S403: before the washing machine is operated, the microcontroller unit compares the value of the superimposed magnetic field strength signal with the third threshold value; if the value of the superimposed magnetic field strength signal is less than or greater than the third threshold value, the microcontroller unit outputs a washing machine door cover open signal; if the value of the superimposed magnetic field strength signal is equal to the third threshold value, the microcontroller unit outputs a washing machine door cover close signal; S404: During the operation of the washing machine, the micro control unit compares the value of the superimposed magnetic field strength signal with the fourth threshold value; if the value of the superimposed magnetic field strength signal is equal to the fourth threshold value, the micro control unit outputs a barrel collision signal.

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