Testing Structure and Testing Method for Washing Machine Door Lid Switch and Drum Bump Switch

Abstract

This application discloses a detection structure and method for a washing machine door cover switch and drum-collision switch. A first magnet is placed on the washing machine door cover, and / or a second magnet is placed on the washing machine outer drum. A magnetic induction chip and a microcontroller unit are integrated into the washing machine's computer board. The magnetic induction chip detects the magnetic field strength signal of the first magnet and / or the second magnet in real time, and the microcontroller unit compares the detected magnetic field strength signal with a set threshold to determine the opening / closing state of the washing machine door cover and / or the drum-collision state. This application uses a magnetic induction chip to replace the traditional mechanical drum-collision switch and / or reed switch (or similar magnetic induction switch device) on washing machines, reducing system costs. Furthermore, the magnetic induction chip can be directly integrated into the washing machine's computer board, eliminating the need for wiring harnesses, simplifying the structure, and further reducing system costs.

Description

Technical Field

[0001] This application relates to the field of circuit testing technology, specifically to the testing structure and testing method for the door cover switch and drum hit switch of a washing machine. Background Technology

[0002] Currently, the conventional method for detecting the opening and closing of a washing machine door lid is as follows: a reed switch (i.e., a magnetic reed switch, which is an electrical switch operated by an applied magnetic field) or a similar magnetic induction switch device is installed on the washing machine's control board, and the reed switch or similar magnetic induction switch device is connected to the control board via a wiring harness. At the same time, a magnet is installed on the washing machine door lid. When the washing machine door lid is closed, the magnet on the washing machine door lid generates a magnetic force on the reed switch or similar magnetic induction switch device, thereby turning on the reed switch or similar magnetic induction switch device and outputting a switch signal to the control board, thereby detecting whether the washing machine door lid is in the closed state.

[0003] In addition, the current conventional method for detecting drum collisions in washing machines is as follows: a mechanical drum collision switch is installed on the washing machine, and the mechanical drum collision switch is connected to the washing machine's computer board via a wiring harness; when the outer tub shifts significantly and collides with the drum, the mechanical drum collision switch is turned on or off, thereby outputting a switch signal to the computer board to detect whether a drum collision has occurred.

[0004] However, the conventional methods used to detect the opening and closing of the washing machine door and the washing machine drum impact are relatively expensive, requiring wiring harnesses and thus the overall cost is also relatively high.

[0005] Therefore, how to improve the existing detection methods for washing machine door cover switches and washing machine drum collision switches to overcome the above-mentioned shortcomings is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] One objective of this application is to provide a low-cost detection structure and detection method for a washing machine door cover switch and drum hit switch.

[0007] To achieve the above objectives, one of the technical solutions adopted in this application is: a door cover opening and closing detection structure for a washing machine, comprising: a first magnet disposed on the washing machine door cover; a magnetic induction chip disposed on the washing machine's computer board, the magnetic induction chip being used to detect a first magnetic field strength signal of the first magnet in real time; and a microcontroller unit disposed on the washing machine's computer board, the microcontroller unit being 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 microcontroller unit is used to output a washing machine door cover opening signal; when the value of the first magnetic field strength signal is greater than or equal to the first threshold, the microcontroller unit is used to output a washing machine door cover closing signal.

[0008] Preferably, the magnetic induction chip has 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 microcontroller unit, and the second pin and the microcontroller unit are connected to the VSS power supply terminal through a 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 a second capacitor.

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

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

[0011] Based on one of the above technical solutions, this application also provides a detection method for a door cover opening and closing detection structure of a washing machine, comprising the following steps:

[0012] S101: When the washing machine door is closed, the magnetic induction chip detects the magnetic field strength signal of the first magnet and sets it as a first threshold, and stores the first threshold in the microcontroller unit.

[0013] S102: Before the washing machine starts, the magnetic induction chip detects the first magnetic field strength signal of the first magnet in real time and transmits the first magnetic field strength signal to the microcontroller unit.

[0014] S103: The microcontroller compares the value of the first magnetic field strength signal with the first threshold; if the value of the first magnetic field strength signal is less than the first threshold, the microcontroller outputs a washing machine door open signal; if the value of the first magnetic field strength signal is greater than or equal to the first threshold, the microcontroller outputs a washing machine door closed signal.

[0015] The second technical solution adopted in this application is: a drum-collision switch detection structure for a washing machine, comprising: a second magnet disposed on the outer drum of the washing machine; a magnetic induction chip disposed on the computer board of the washing machine, the magnetic induction chip being used to detect the second magnetic field strength signal of the second magnet in real time; and a microcontroller unit disposed on the computer board of the washing machine, the microcontroller unit being used to compare the value of the received second magnetic field strength signal with a second threshold; when the value of the second magnetic field strength signal is greater than or equal to the second threshold, the microcontroller unit is used to output a drum-collision signal.

[0016] Preferably, the magnetic induction chip has 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 microcontroller unit, and the second pin and the microcontroller unit are connected to the VSS power supply terminal through a 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 a second capacitor.

[0017] Preferably, the magnetic field direction of the second magnet is arranged parallel to or perpendicular to the central axis of the washing machine outer drum; or, when the washing machine outer drum is in the impact position, the magnetic field direction of the second magnet is arranged horizontally or vertically.

[0018] Preferably, the magnetic induction chip is a switch-type output magnetic induction chip or a linear output magnetic induction chip.

[0019] Based on the second technical solution mentioned above, this application also provides a detection method for a drum-collision switch detection structure of a washing machine, comprising the following steps:

[0020] S201: When the outer drum of the washing machine is in the position of hitting the drum, the magnetic induction chip detects the value of the magnetic field strength signal of the second magnet and sets it as the second threshold, and stores the second threshold in the microcontroller unit;

[0021] S202: During the operation of the washing machine, the magnetic induction chip detects the second magnetic field strength signal of the second magnet in real time and transmits the second magnetic field strength signal to the microcontroller unit.

[0022] S203: The microcontroller unit compares the value of the second magnetic field strength signal with the second threshold; if the value of the second magnetic field strength signal is greater than or equal to the second threshold, the microcontroller unit outputs a barrel-ramming signal.

[0023] The third technical solution adopted in this application is: a door cover opening and closing / drum-collision switch detection structure for a washing machine, comprising: a first magnet, the first magnet being disposed on the washing machine door cover, and the washing machine door cover being an upward-opening structure; a magnetic induction chip, the magnetic induction chip being disposed on the computer board of the washing machine, the magnetic induction chip being used to detect the first magnetic field strength signal of the first magnet in real time; and a microcontroller unit, the microcontroller unit being disposed on the computer board of the washing machine, the microcontroller unit being 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 microcontroller 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 microcontroller 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 a frequency threshold, and / or the fluctuation amplitude of the value of the first magnetic field strength signal is greater than or equal to an amplitude threshold, the microcontroller unit is used to output a drum-collision signal.

[0024] Preferably, the magnetic induction chip has 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 microcontroller unit, and the second pin and the microcontroller unit are connected to the VSS power supply terminal through a 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 a second capacitor.

[0025] Preferably, when the washing machine door is closed, the magnetic field direction of the first magnet is arranged in a horizontal or vertical direction.

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

[0027] Based on the third technical solution mentioned above, this application also provides a detection method for the detection structure of the door cover switch and the drum-collision switch of a washing machine, including the following steps:

[0028] S301: When the washing machine door is closed, the magnetic induction chip sets the value of the magnetic field strength signal of the first magnet detected by the magnetic induction chip as a first threshold, and stores the first threshold in the microcontroller unit; when the washing machine is in the drum-bumping position, the fluctuation frequency 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 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 microcontroller unit;

[0029] S302: The magnetic induction chip detects the first magnetic field strength signal of the first magnet in real time and transmits the first magnetic field strength signal to the microcontroller unit;

[0030] S303: Before the washing machine starts running, the microcontroller compares the value of the first magnetic field strength signal with the first threshold. If the value of the first magnetic field strength signal is less than the first threshold, the microcontroller outputs a washing machine door open signal. If the value of the first magnetic field strength signal is equal to the first threshold, the microcontroller outputs a washing machine door close signal.

[0031] 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, then the microcontroller unit outputs a drum-collision signal.

[0032] The fourth technical solution adopted in this application is: a door cover opening and drum collision detection structure for a washing machine, comprising: a first magnet disposed on the washing machine door cover; a second magnet disposed on the washing machine outer drum; a magnetic induction chip disposed on the washing machine's computer board, the magnetic induction chip being used to detect the superimposed magnetic field strength signal of the first magnet and the second magnet in real time; and a microcontroller unit disposed on the washing machine's computer board; the microcontroller unit being used to compare the received value of the 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 microcontroller unit is used to output a washing machine door cover opening signal; when the value of the superimposed magnetic field strength signal is equal to the third threshold, the microcontroller unit is used to output a washing machine door cover closing signal; when the value of the superimposed magnetic field strength signal is equal to the fourth threshold, the microcontroller unit is used to output a drum collision signal.

[0033] Preferably, the magnetic induction chip has 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 microcontroller unit, and the second pin and the microcontroller unit are connected to the VSS power supply terminal through a 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 a second capacitor.

[0034] Preferably, when the washing machine door is closed, the magnetic field direction of the first magnet is arranged in a horizontal or vertical direction.

[0035] Preferably, the magnetic field direction of the second magnet is arranged parallel to or perpendicular to the central axis of the washing machine outer drum; or, when the washing machine outer drum is in the impact position, the magnetic field direction of the second magnet is arranged horizontally or vertically.

[0036] Preferably, the magnetic induction chip is a switch-type output magnetic induction chip or a linear output magnetic induction chip.

[0037] Based on the fourth technical solution mentioned above, this application also provides a detection method for the detection structure of the door cover switch and the drum-collision switch of a washing machine, including the following steps:

[0038] S401: When the washing machine door is closed and the washing machine is not started, the magnetic induction chip detects the value of the superimposed magnetic field strength signal of the first magnet and the second magnet and sets it as a third threshold; when the washing machine door is closed and the washing machine is in the drum-bumping position, the magnetic induction chip detects the value of the superimposed magnetic field strength signal of the first magnet and the second magnet and sets it as a fourth threshold; and stores the third threshold and the fourth threshold in the microcontroller unit;

[0039] S402: The magnetic induction chip detects the superimposed magnetic field strength signal of the first magnet and the second magnet in real time, and transmits the superimposed magnetic field strength signal to the microcontroller unit;

[0040] S403: Before the washing machine starts running, the microcontroller compares the value of the superimposed magnetic field strength signal with the third threshold. If the value of the superimposed magnetic field strength signal is less than or greater than the third threshold, the microcontroller outputs a washing machine door open signal. If the value of the superimposed magnetic field strength signal is equal to the third threshold, the microcontroller outputs a washing machine door close signal.

[0041] S404: During the operation of the washing machine, the microcontroller compares the value of the superimposed magnetic field strength signal with the fourth threshold; if the value of the superimposed magnetic field strength signal is equal to the fourth threshold, the microcontroller outputs a drum-collision signal.

[0042] Compared with the prior art, the beneficial effects of this application are as follows: (1) Since the opening angle of the washing machine door determines the distance between the first magnet on the washing machine door and the magnetic induction chip on the computer board, the greater the distance, the lower the magnetic field strength detected by the magnetic induction chip. This feature can be used to identify the opening and closing state of the washing machine door. Similarly, when the washing machine is in the drum-collision state, that is, when the inner drum of the washing machine collides with the outer drum of the washing machine, the outer drum of the washing machine deflects, 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 is in the drum-collision state.

[0043] (2) This application uses a magnetic induction chip to detect the mechanical drum-bumping switch and / or reed switch (or similar magnetic induction switching device) on the traditional washing machine, which reduces 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 wiring harness layout, making the structure simpler, and further reducing the cost of the system. Attached Figure Description

[0044] Figure 1 This is a schematic diagram illustrating the connection between a magnetic induction chip and a microcontroller unit provided in this application.

[0045] In the diagram: 1. Magnetic induction chip; 2. Microcontroller unit. Detailed Implementation

[0046] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0047] In the description of this application, it should be noted that directional terms such as "center," "lateral," "longitudinal," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific scope of protection of this application. The terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. The terms "comprising" and "having," and any variations thereof, in the specification and claims of this application, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0048] Example 1

[0049] Reference Figure 1 This embodiment provides a door cover opening and closing detection structure for a washing machine, including a first magnet, a magnetic induction chip 1, and a microcontroller unit 2. The first magnet is disposed on the washing machine door cover. The magnetic induction chip 1 is disposed on the washing machine's computer board and is used to detect the first magnetic field strength signal of the first magnet in real time. The microcontroller unit 2 is disposed on the washing machine's computer board and 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 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 greater than or equal to the first threshold, the microcontroller unit 2 is used to output a washing machine door cover closing signal.

[0050] Working Principle: Since the installation positions of the first magnet and the magnetic induction chip 1 are fixed, when the washing machine door is closed, the value of the first magnetic field strength signal detected by the magnetic induction chip 1 is fixed (i.e., the first threshold). After the washing machine door is opened, the first magnet moves away from the magnetic induction chip 1, and the value of the first magnetic field strength signal detected by the magnetic induction chip 1 decreases. Therefore, utilizing this characteristic, before the washing machine starts operating, the microcontroller 2 only needs to compare the received first magnetic field strength signal value with the first threshold. If the first magnetic field strength signal value is less than the first threshold, the microcontroller 2 outputs a washing machine door open signal; if the first magnetic field strength signal value is greater than or equal to the first threshold, the microcontroller 2 outputs a washing machine door closed signal. Generally, the washing machine will only run its program when the door is closed to ensure operational safety. In other words, replacing the reed switch or similar magnetic induction switch on a traditional washing machine with the magnetic induction chip 1 reduces system costs. Furthermore, the magnetic induction chip 1 can be directly integrated onto the washing machine's computer board, eliminating the need for wiring harnesses, simplifying the structure, and further reducing system costs.

[0051] In this embodiment, the magnetic induction chip 1 is either a switch-type output magnetic induction chip 1 or a linear output magnetic induction chip 1. The switch-type output magnetic induction chip 1 outputs a high-level signal or a low-level signal based on 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 chip's set magnetic induction intensity, the magnetic induction chip 1 outputs a low-level signal, corresponding to an open signal for the washing machine door; conversely, when the magnetic induction intensity reaches the chip's set magnetic induction intensity, the magnetic induction chip 1 outputs a high-level signal, corresponding to a closed signal for the washing machine door. The linear output magnetic induction chip 1, also known as a continuous output magnetic induction chip 1, outputs a continuously changing voltage value based on the sensed magnetic induction intensity. Since the voltage signal is continuous, it is output to the AD port of the microcontroller unit 2. The microcontroller 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.

[0052] In this embodiment, when the washing machine door is closed, the magnetic field direction of the first magnet is preferably arranged horizontally or vertically. This arrangement facilitates assembly and control during the production process.

[0053] Based on Embodiment 1, a detection method for a washing machine door lid opening and closing detection structure is also provided, comprising the following steps:

[0054] S101: When the washing machine door is closed, the magnetic induction chip 1 sets the value of the magnetic field strength signal of the first magnet detected by the first magnet as the first threshold, and stores the first threshold in the microcontroller unit 2;

[0055] S102: Before the washing machine starts, the magnetic induction chip 1 detects the first magnetic field strength signal of the first magnet in real time and transmits the first magnetic field strength signal to the microcontroller unit 2.

[0056] S103: The microcontroller unit 2 compares the value of the first magnetic field strength signal with the first threshold; if the value of the first magnetic field strength signal is less than the first threshold, the microcontroller unit 2 outputs a washing machine door opening signal; if the value of the first magnetic field strength signal is greater than or equal to the first threshold, the microcontroller unit 2 outputs a washing machine door closing signal.

[0057] Example 2

[0058] Reference Figure 1 The difference between this embodiment and Embodiment 1 is that the magnet is placed on the outer drum of the washing machine. Specifically, this embodiment provides a drum-collision switch detection structure for a washing machine, including a second magnet, a magnetic induction chip 1, and a microcontroller unit 2. The second magnet is placed on the outer drum of the washing machine; the magnetic induction chip 1 is placed on the computer board of the washing machine and is used to detect the second magnetic field strength signal of the second magnet in real time; the microcontroller unit 2 is placed on the computer board of the washing machine and is used to compare the value of the received second magnetic field strength signal with a second threshold; when the value of the second magnetic field strength signal is greater than or equal to the second threshold, the microcontroller unit 2 is used to output a drum-collision signal.

[0059] Working principle: Since the installation positions of the second magnet and the magnetic induction chip 1 are fixed, when the washing machine is not in a drum-collision state, the magnetic induction chip 1 detects that the value of the second magnetic field strength signal of the second magnet is lower than the second threshold, allowing the washing machine to continue operating. However, when the washing machine is in a drum-collision state, the inner drum deflects excessively, pushing the outer drum to deflect as well. At this time, the second magnet approaches the magnetic induction chip 1, causing the value of the second magnetic field strength signal detected by the magnetic induction chip 1 to be greater than or equal to the second threshold. This triggers the microcontroller 2 to output a drum-collision signal, promptly stopping the washing machine to ensure operational safety. In other words, replacing the traditional mechanical drum-collision switch on the washing machine with the magnetic induction chip 1 reduces system costs. Furthermore, the magnetic induction chip 1 can be directly integrated onto the washing machine's computer board, eliminating the need for wiring harnesses, simplifying the structure, and further reducing system costs.

[0060] In this embodiment, the magnetic field direction of the second magnet is preferably arranged parallel to or perpendicular to the central axis of the washing machine's outer drum. This arrangement facilitates assembly and control during the production process.

[0061] In this embodiment, in order to facilitate more accurate detection of the drum impact signal, the magnetic field direction of the second magnet can be arranged in a horizontal or vertical direction when the outer drum of the washing machine is in the drum impact position.

[0062] 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.

[0063] Based on Embodiment 2, this application also provides a detection method for a drum-collision switch detection structure of a washing machine, comprising the following steps:

[0064] S201: When the outer drum of the washing machine is in the position of hitting the drum, the magnetic induction chip 1 sets the value of the magnetic field strength signal of the second magnet detected by the corresponding magnetic induction chip 1 as the second threshold, and stores the second threshold in the microcontroller unit 2;

[0065] S202: During the operation of the washing machine, the magnetic induction chip 1 detects the second magnetic field strength signal of the second magnet in real time and transmits the second magnetic field strength signal to the microcontroller unit 2;

[0066] S203: The value of the second magnetic field strength signal is compared with the second threshold by the microcontroller unit 2; if the value of the second magnetic field strength signal is greater than or equal to the second threshold, the microcontroller unit 2 outputs the barrel-collision signal.

[0067] Example 3

[0068] Reference Figure 1 This embodiment provides a door cover opening and drum collision detection structure for a washing machine, including a first magnet, a magnetic induction chip 1, and a microcontroller unit 2. The first magnet is disposed on the washing machine door cover, and the washing machine door cover is an upward-opening structure. The magnetic induction chip 1 is disposed on the washing machine's computer board and is used to detect the first magnetic field strength signal of the first magnet in real time. The microcontroller unit 2 is disposed on the washing machine's computer board and 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 microcontroller unit 2 is used to output a washing machine door open signal. When the value of the first magnetic field strength signal is equal to the first threshold, the microcontroller unit 2 is used to output a washing machine door closed signal. When the fluctuation frequency of the value of the first magnetic field strength signal is greater than or equal to a frequency threshold, and / or the fluctuation amplitude of the value of the first magnetic field strength signal is greater than or equal to an amplitude threshold, the microcontroller unit 2 is used to output a drum collision signal.

[0069] Working Principle: Before the washing machine starts running, the principle for determining the opening and closing status of the washing machine door is the same as in Embodiment 1, and will not be described in detail here. During the operation of the washing machine, the greater the deflection angle of the inner drum, the stronger the vibration of the washing machine. For top-loading washing machines, the washing machine door closes naturally under the action of gravity. After being subjected to vibration, the washing machine door will bounce. The stronger the vibration, the more obvious the bouncing (i.e., the higher the bouncing frequency and the greater the bouncing amplitude). Therefore, this characteristic can be used to identify whether the washing machine is hitting the drum. In other words, by replacing the traditional mechanical drum-hitting switch and reed switch (or similar magnetic induction switch device) on the washing machine with the magnetic induction chip 1, the system cost is reduced; and the magnetic induction chip 1 can be directly integrated into the washing machine's computer board, thereby eliminating the need for wiring harness layout, making the structure simpler, and further reducing the system cost.

[0070] It is understandable that the frequency of the washing machine door's movement can be used to identify whether the machine is hitting the drum. The higher the frequency of movement, the higher the fluctuation frequency of the first magnetic field strength signal. When the frequency threshold set for the drum-hitting state is reached, a drum-hitting signal can be output. Similarly, the amplitude of the washing machine door's movement can also be used to identify whether the machine is hitting the drum. The larger the amplitude of movement (i.e., the larger the opening angle of the washing machine door), the farther the first magnet is from the magnetic induction chip 1. In this case, the linear output magnetic induction chip 1 is used for detection. The farther the first magnet is from the magnetic induction chip 1, the greater the fluctuation amplitude of the first magnetic field strength signal. When the amplitude threshold set for the drum-hitting state is reached, a drum-hitting signal can be output. Alternatively, both the fluctuation frequency and fluctuation amplitude of the first magnetic field strength signal can be combined to identify whether the machine is hitting the drum. That is, a drum-hitting signal will only be output when both the fluctuation frequency and fluctuation amplitude of the first magnetic field strength signal reach the frequency threshold and the amplitude threshold, respectively.

[0071] It should be understood that the fluctuation frequency of the first magnetic field strength signal can be represented by the number of times the microcontroller 2 outputs the washing machine door closing signal per unit time, or by the number of times the microcontroller 2 outputs the washing machine door opening signal per unit time, or by the number of times the microcontroller 2 alternately outputs the washing machine door opening signal and the washing machine door closing signal per unit time. The fluctuation amplitude of the first magnetic field strength signal is related to the opening angle of the washing machine door. 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 first magnetic field strength signal.

[0072] In this embodiment, when the washing machine door is closed, the magnetic field direction of the first magnet is preferably arranged horizontally or vertically. This arrangement facilitates assembly and control during the production process.

[0073] In this embodiment, the magnetic induction chip 1 is either a switch-type output magnetic induction chip 1 or a linear output magnetic induction chip 1. It should be understood that when it is necessary to use the fluctuation amplitude of the value of the first magnetic field strength signal as a feature to identify whether a collision has occurred, a linear output magnetic induction chip 1 is required.

[0074] Based on Embodiment 3, this application also provides a detection method for the detection structure of the door cover switch and the drum-collision switch of a washing machine, including the following steps:

[0075] S301: When the washing machine door is closed, the magnetic induction chip 1 sets the value of the magnetic field strength signal of the first magnet detected by the magnetic induction chip 1 as a first threshold and stores the first threshold in the microcontroller 2; when the washing machine is in the drum-bumping 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, 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, and the frequency threshold and / or amplitude threshold are stored in the microcontroller 2;

[0076] S302: The first 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 microcontroller unit 2;

[0077] S303: Before the washing machine starts, the microcontroller 2 compares the value of the first magnetic field strength signal with the first threshold. If the value of the first magnetic field strength signal is less than the first threshold, the microcontroller 2 outputs a washing machine door opening signal. If the value of the first magnetic field strength signal is equal to the first threshold, the microcontroller 2 outputs a washing machine door closing signal.

[0078] 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, then the microcontroller unit 2 outputs a drum-collision signal.

[0079] Example 4

[0080] Reference Figure 1This embodiment provides a door cover opening and drum impact detection structure for a washing machine, including a first magnet, a second magnet, a magnetic induction chip 1, and a microcontroller unit 2. The first magnet is disposed on the washing machine door cover; the second magnet is disposed on the washing machine outer drum; the magnetic induction chip 1 is disposed on the washing machine's computer board and is used to detect the superimposed magnetic field strength signal of the first magnet and the second magnet in real time; the microcontroller unit 2 is disposed on the washing machine's computer board; the microcontroller unit 2 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 microcontroller unit 2 is used to output a washing machine door cover opening signal; when the value of the superimposed magnetic field strength signal is equal to the third threshold, the microcontroller unit 2 is used to output a washing machine door cover closing signal; when the value of the superimposed magnetic field strength signal is equal to the fourth threshold, the microcontroller unit 2 is used to output a drum impact signal.

[0081] Working Principle: This embodiment utilizes a first magnet installed on the washing machine door and a second magnet installed on the outer drum. A magnetic induction chip 1 detects the superimposed magnetic field strength signal of the first and second magnets to identify the open / closed state of the washing machine door and its contact with the drum. Before the washing machine starts running, the inner drum does not rotate, meaning the position of the second magnet on the outer drum remains fixed. At this time, the position of the washing machine door determines the strength of the superimposed magnetic field. Therefore, when the inner drum is not rotating and the washing machine door is closed, the detected value of the superimposed magnetic field strength signal is set to a third threshold. When the detected real-time superimposed magnetic field strength signal equals the third threshold, it indicates that the washing machine door is closed. Similarly, during the operation of the washing machine, since the washing machine door is closed (applicable to washing machines with locking or damping structures to prevent vibration from causing the door to jump and cause errors), the position of the first magnet on the washing machine door 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 detected in the drum-collision state to the fourth threshold. When the value of the superimposed magnetic field strength signal detected in real time is equal to the fourth threshold, it can be reflected that the washing machine is in the drum-collision state. In other words, by replacing the traditional mechanical drum-collision switch and reed switch (or similar magnetic induction switch device) on the washing machine with the magnetic induction chip 1, the system cost is reduced; and the magnetic induction chip 1 can be directly integrated into the washing machine's computer board, thereby eliminating the need for wiring harness layout, making the structure simpler, and further reducing the system cost.

[0082] In this embodiment, when the washing machine door is closed, the magnetic field direction of the first magnet is preferably arranged horizontally or vertically. This arrangement facilitates assembly and control during the production process.

[0083] In this embodiment, the magnetic field direction of the second magnet is preferably arranged parallel to or perpendicular to the central axis of the washing machine's outer drum. This arrangement facilitates assembly and control during the production process.

[0084] In this embodiment, in order to facilitate more accurate detection of the drum impact signal, the magnetic field direction of the second magnet can be arranged in a horizontal or vertical direction when the outer drum of the washing machine is in the drum impact position.

[0085] 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.

[0086] Based on Embodiment 4, this application also provides a detection method for the detection structure of the door cover switch and the drum-collision switch of a washing machine, characterized by including the following steps:

[0087] S401: When the washing machine door is closed and the washing machine is not started, the magnetic induction chip 1 sets the value of the superimposed magnetic field strength signal of the first magnet and the second magnet to a third threshold; when the washing machine door is closed and the washing machine is in the drum-bumping position, the magnetic induction chip 1 sets the value of the superimposed magnetic field strength signal of the first magnet and the second magnet to a fourth threshold; and stores the third threshold and the fourth threshold in the microcontroller unit 2.

[0088] S402: The magnetic induction chip 1 detects the superimposed magnetic field strength signal of the first magnet and the second magnet in real time, and transmits the superimposed magnetic field strength signal to the microcontroller unit 2.

[0089] S403: Before the washing machine starts, the microcontroller unit 2 compares the value of the superimposed magnetic field strength signal with the third threshold. If the value of the superimposed magnetic field strength signal is less than or greater than the third threshold, the microcontroller unit 2 outputs a washing machine door opening signal. If the value of the superimposed magnetic field strength signal is equal to the third threshold, the microcontroller unit 2 outputs a washing machine door closing signal.

[0090] S404: During the operation of the washing machine, the value of the superimposed magnetic field strength signal is compared with the fourth threshold by the microcontroller unit 2; if the value of the superimposed magnetic field strength signal is equal to the fourth threshold, the microcontroller unit 2 outputs a drum-collision signal.

[0091] In any embodiment of this application, such as Figure 1As shown, the magnetic induction chip 1 has 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 microcontroller unit 2, and the second pin and the microcontroller unit 2 are connected to the VSS power supply terminal through a 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 a second capacitor. When powered by the VDD and VSS power supply terminals, the electrical signal generated by the magnetic induction chip 1 when it is subjected to a magnetic field (i.e., the first magnetic field strength signal) will be transmitted to the microcontroller unit 2 (i.e., the MCU) through the second pin. The microcontroller unit 2 can then process the received electrical signal and make corresponding judgments.

[0092] In some embodiments of this application, since production errors may cause the gap size of each washing machine to be different, when the washing machine door is in a closed and stationary state, the output value of the magnetic induction chip 1 is calibrated to zero, thereby effectively removing the bias value and preventing system misjudgment due to gap errors.

[0093] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made without departing from the spirit and scope of this application, and all such changes and modifications fall within the scope of protection claimed by this application. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A detection structure for the door lid switch and drum impact switch of a washing machine, characterized in that, include: A first magnet is disposed on the washing machine door cover, and the washing machine door cover is an upward flip-top structure; A magnetic induction chip is installed on the computer board of the washing machine. The magnetic induction chip is used to detect the first magnetic field strength signal of the first magnet in real time. as well as A microcontroller unit, disposed on the computer board of the washing machine, 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 microcontroller unit is used to output a washing machine door open signal; when the value of the first magnetic field strength signal is equal to the first threshold, the microcontroller unit is used to output a washing machine door closed signal; when the fluctuation frequency of the value of the first magnetic field strength signal is greater than or equal to a frequency threshold, and / or the fluctuation amplitude of the value of the first magnetic field strength signal is greater than or equal to an amplitude threshold, the microcontroller unit is used to output a drum-collision signal.

2. The detection structure for the door cover switch and drum impact switch of the washing machine as described in claim 1, characterized in that, The magnetic induction chip has 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 microcontroller unit, and the second pin and the microcontroller unit are connected to the VSS power supply terminal through a 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 a second capacitor.

3. The detection structure for the door cover switch and drum impact switch of the washing machine as described in claim 1 or 2, characterized in that, When the washing machine door is closed, the magnetic field of the first magnet is arranged in either a horizontal or vertical direction. And / or, the magnetic induction chip is a switching output magnetic induction chip or a linear output magnetic induction chip.

4. The detection method for the door cover switch and drum-collision switch detection structure of the washing machine as described in any one of claims 1-3, characterized in that, Includes the following steps: S301: When the washing machine door is closed, the magnetic induction chip detects the magnetic field strength signal of the first magnet and sets it as a first threshold, and stores the first threshold in the microcontroller unit. When the washing machine is in the drum-bumping position, the fluctuation frequency 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 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 microcontroller unit; S302: The magnetic induction chip detects the first magnetic field strength signal of the first magnet in real time and transmits the first magnetic field strength signal to the microcontroller unit; S303: Before the washing machine starts running, the microcontroller compares the value of the first magnetic field strength signal with the first threshold. If the value of the first magnetic field strength signal is less than the first threshold, the microcontroller outputs a washing machine door open signal. If the value of the first magnetic field strength signal is equal to the first threshold, the microcontroller outputs a washing machine door 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, then the microcontroller unit outputs a drum-collision signal.

5. A detection structure for the door lid switch and drum impact switch of a washing machine, characterized in that, include: A first magnet is disposed on the door cover of the washing machine; A second magnet is disposed on the outer drum of the washing machine; A magnetic induction chip is installed on the computer board of the washing machine. The magnetic induction chip is used to detect the superimposed magnetic field strength signal of the first magnet and the second magnet in real time. as well as A microcontroller unit is disposed on the computer board of the washing machine. The microcontroller 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 microcontroller unit is used to output a washing machine door open signal; when the value of the superimposed magnetic field strength signal is equal to the third threshold, the microcontroller unit is used to output a washing machine door closed signal; when the value of the superimposed magnetic field strength signal is equal to the fourth threshold, the microcontroller unit is used to output a drum-collision signal. The door cover switch and drum impact switch detection structure of the washing machine is suitable for washing machines with door covers that have locking or damping structures, preventing vibration from causing the washing machine door cover to jump and cause errors.

6. The door cover switch and drum-collision switch detection structure of the washing machine as described in claim 5, characterized in that, The magnetic induction chip has 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 microcontroller unit, and the second pin and the microcontroller unit are connected to the VSS power supply terminal through a 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 a second capacitor.

7. The door cover switch and drum-collision switch detection structure of the washing machine as described in claim 5 or 6, characterized in that, When the washing machine door is closed, the magnetic field of the first magnet is arranged in either a horizontal or vertical direction. And / or, the magnetic field direction of the second magnet is arranged 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-bumping position, the magnetic field direction of the second magnet is arranged horizontally or vertically. And / or, the magnetic induction chip is a switching output magnetic induction chip or a linear output magnetic induction chip.

8. The detection method for the door cover switch and drum-collision switch detection structure of the washing machine as described in any one of claims 5-7, characterized in that, Includes the following steps: S401: When the washing machine door is closed and the washing machine is not started, the magnetic induction chip detects the value of the superimposed magnetic field strength signal of the first magnet and the second magnet and sets it as a third threshold; when the washing machine door is closed and the washing machine is in the drum-bumping position, the magnetic induction chip detects the value of the superimposed magnetic field strength signal of the first magnet and the second magnet and sets it as a fourth threshold; and stores the third threshold and the fourth threshold in the microcontroller unit; S402: The magnetic induction chip detects the superimposed magnetic field strength signal of the first magnet and the second magnet in real time, and transmits the superimposed magnetic field strength signal to the microcontroller unit; S403: Before the washing machine starts running, the microcontroller compares the value of the superimposed magnetic field strength signal with the third threshold. If the value of the superimposed magnetic field strength signal is less than or greater than the third threshold, the microcontroller outputs a washing machine door open signal. If the value of the superimposed magnetic field strength signal is equal to the third threshold, the microcontroller outputs a washing machine door close signal. S404: During the operation of the washing machine, the microcontroller compares the value of the superimposed magnetic field strength signal with the fourth threshold; if the value of the superimposed magnetic field strength signal is equal to the fourth threshold, the microcontroller outputs a drum-collision signal.

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