A laundry machine with door cover blur detection

Abstract

The application discloses a washing machine with door cover blur detection, which comprises a washing machine control circuit and washing machine function electrical elements, wherein the washing machine control circuit comprises a controller mainboard, a power supply and a blur detection circuit; the power supply comprises a first power supply and a second power supply, wherein the controller mainboard is connected with the first power supply; a plurality of function terminal interfaces are arranged on the controller mainboard, the washing machine function electrical elements comprise a washing motor and a door switch, the washing motor is connected to the second power supply through the function terminal interfaces after being connected to the washing machine control circuit through the door switch; and the blur detection circuit is connected with the washing motor and the controller. The washing machine with door cover blur detection realizes door cover detection through motor blur detection, so that the washing machine control circuit is optimized in circuit structure, the production cost of the control circuit board is reduced, and the running safety of the washing machine is improved through the direct control of the door switch, so that the power supply of the washing motor can be cut off in time if the door cover is abnormally opened when the washing machine is washing or dehydrating.

Description

Technical Field

[0001] This invention relates to the field of clothing cleaning appliances, and in particular to a washing machine with fuzzy detection of the door cover. Background Technology

[0002] In modern life, washing machines, as electrical appliances for washing clothes and bedding, are widely welcomed for effectively reducing people's housework burden. Washing and spin-drying are the main functions of a washing machine. This is achieved primarily through the rotation of the washing drum, driven by the washing motor, to achieve the washing or spin-drying effect. According to relevant national safety certification requirements (specific requirements for the safety of household or similar appliances: the machine lid or door should not be opened when the drum speed exceeds 60 rpm), washing machines must meet certain safety requirements during washing or spin-drying. Therefore, washing machines are equipped with a safety operation detection structure, mainly for the safety control of the washing machine door. This structure ensures that the power supply to the washing motor is promptly cut off if the door is abnormally opened during washing or spin-drying, guaranteeing the safe operation of the washing machine.

[0003] Current washing machine safety operation detection typically focuses on the door lid. When the washing machine is washing or spinning, after the lid is opened, the door switch disconnects, and the computer controller (MCU) detects a low level through the door lid detection circuit. This triggers a power cut-off to all loads and an E2 lid-opening fault alarm. The shortcomings of this detection and control method are that the circuitry is relatively complex, the control circuit board is expensive to manufacture, and the detection accuracy is insufficient. Interference or accidental loss of the detection signal can easily lead to false alarms, misreports, or missed alarms, causing the motor to continue running even after the door is open, thus compromising the washing machine's operational safety.

[0004] Fuzzy detection circuits are used in existing washing machines to detect the amount of laundry and match the corresponding water usage. They primarily determine the required water level by detecting the number of motor pulses. For example, Chinese patent application number CN202010195037.X discloses a fuzzy control method for a washing machine; see appendix. Figure 3The structure and principle of its fuzzy detection control are as follows: When the washing machine is first powered on, the controller 3' controls the motor 2' to start and stop according to a preset cycle. This preset cycle consists of controlling the motor to rotate forward, pause, reverse, and pause, repeating 5 times. After the motor 2' stops rotating, it generates a reverse electromotive force (EMF). By starting and stopping the motor 2' according to the preset cycle, the controller 3' generates sufficient EMF for processing. The EMF generated by the motor 2' after starting and stopping according to the preset cycle is collected by the controller 3'. Specifically, the optocoupler processing circuit 31' in the controller 3' processes and converts the EMF generated by the motor 2', ultimately converting the EMF of the motor 2' into a pulse signal. After the optocoupler processing circuit 31' processes the EMF into a pulse signal, the interrupt input terminal 32' in the controller 3' is responsible for collecting the pulse signal generated by the optocoupler processing circuit 31' and transmitting it to the controller 3' for signal processing.

[0005] However, the existing washing machine door detection control and fuzzy detection are two independent detection and control units, which increases the complexity of the washing machine controller and the production cost of the corresponding control circuit board is relatively high. Summary of the Invention

[0006] To address the aforementioned background and the problems existing in prior art methods, this invention provides a washing machine with fuzzy door detection. The technical solution of this invention is as follows:

[0007] A washing machine with fuzzy detection for the door cover includes a washing machine control circuit and functional electrical components. The washing machine control circuit includes a controller motherboard, a power supply, and a fuzzy detection circuit. The power supply includes a first power supply and a second power supply, and the controller motherboard is connected to the first power supply. The controller motherboard is provided with several functional terminal interfaces. The functional electrical components of the washing machine include a washing motor and a door switch. The washing motor is connected to the washing machine control circuit through the functional terminal interfaces and connected to the second power supply through the door switch. The connection between the washing motor and the second power supply is controlled by the door switch. The fuzzy detection circuit is connected to the washing motor and the controller on the controller motherboard, and is used to detect the back electromotive force of the washing motor and feed back a detection signal to the controller.

[0008] As a further explanation of the present invention, the washing machine control circuit includes an alarm unit, which is connected to the output terminal of the controller, and the controller controls the working state of the alarm unit according to the detection signal.

[0009] Furthermore, the washing machine's functional electrical components also include a drain motor. One end of the drain motor is connected to the washing machine control circuit through a functional terminal interface, and the other end is connected to a second power source through the door switch. The connection between the drain motor and the second power source is controlled by the door switch.

[0010] Furthermore, the functional electrical components of the washing machine also include a cold water valve and a water level sensor, which are connected to the washing machine control circuit through different functional terminal interfaces.

[0011] Furthermore, the second power source is the three-phase power supply connected to the washing machine.

[0012] Furthermore, the door switch is located on the neutral line of the three-phase power supply.

[0013] Furthermore, the fuzzy detection circuit includes an input unit, an optocoupler, and an output unit; the input unit is connected to the input pin of the optocoupler, and the signal input terminal of the fuzzy detection circuit is the forward rotation detection terminal and the reverse rotation detection terminal of the washing motor; the output unit is connected to the output pin of the optocoupler and is used to convert the output of the optocoupler into a pulse signal and output it from the output terminal of the fuzzy detection circuit, and the output terminal of the fuzzy detection circuit is connected to the controller.

[0014] Furthermore, the input unit is formed by connecting resistor R1, diode D1 and diode D2 in series, wherein diode D1 is connected in reverse and diode D2 is connected in forward.

[0015] Furthermore, the output unit consists of transistors Q1 and Q2 and several resistors and is connected to the output pin of the optocoupler, with the emitter of transistor Q1 serving as the output terminal of the fuzzy detection circuit.

[0016] Furthermore, the fuzzy detection circuit also includes a shaping unit consisting of a capacitor C1 and a resistor R2. One end of the capacitor C1 and the resistor R2 are connected in parallel to the collector of the transistor Q1, and the other end is connected to the emitter of the transistor Q2.

[0017] The beneficial effects of this invention are:

[0018] This invention replaces the existing door detection of washing machines with fuzzy motor detection. On the one hand, it optimizes the circuit structure of the washing machine control circuit and reduces the production cost of the control circuit board. On the other hand, through direct control of the door switch, if the door is abnormally opened during washing or spin-drying, it can ensure that the power supply to the washing motor is cut off in time, thereby improving the operational safety of the washing machine. Furthermore, the fuzzy detection circuit accurately controls the start alarm based on the back electromotive force of the washing motor. Attached Figure Description

[0019] Figure 1 This is a block diagram of the control circuit principle of the washing machine of the present invention;

[0020] Figure 2 This is a schematic diagram of the fuzzy detection circuit of the present invention;

[0021] Figure 3 This is a diagram illustrating the fuzzy detection control principle of an existing washing machine. Detailed Implementation

[0022] Example:

[0023] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0025] A washing machine with fuzzy detection for the door cover includes a washing machine control circuit and functional electrical components. The washing machine control circuit includes a controller motherboard, a power supply, and a fuzzy detection circuit. The power supply includes a first power supply and a second power supply, wherein the controller motherboard is connected to the first power supply. The controller motherboard is provided with several functional terminal interfaces. The functional electrical components of the washing machine include a washing motor and a door switch. The washing motor is connected to the washing machine control circuit through the functional terminal interfaces and then connected to the second power supply through the door switch. The connection between the washing motor and the second power supply is controlled by the door switch. The fuzzy detection circuit is connected to the washing motor and the controller on the controller motherboard, and is used to detect the back electromotive force of the washing motor and feed back the detection signal to the controller. This embodiment of the washing machine improves and optimizes the washing machine control circuit. During washing or spin-drying, if the washing machine door is suddenly opened, the door switch connected between the washing motor and the second power supply immediately cuts off the power. The controller, through the fuzzy detection circuit, cannot detect the back electromotive force of the washing motor and will determine that the washing machine door is open, thus enabling subsequent control operations. Compared with existing washing machine door control methods and structures, this embodiment of the washing machine directly controls the power on and off of the washing motor through the door switch, ensuring the accuracy of its power-off action when the lid is opened and improving the safety of the washing machine operation. At the same time, it uses the original fuzzy detection circuit of the washing machine for detection and identification, reducing the door detection circuit and simplifying the circuit structure of the washing machine control circuit, thereby reducing the cost of the controller motherboard. Moreover, the control structure and control method of this embodiment can also enable the washing machine to meet safety certification requirements (according to the special requirements for safety washing machines for household or similar appliances: the lid or door of the appliance should not be opened when the rotation speed of the appliance drum exceeds 60 r / min).

[0026] See appendix Figure 1 As shown, the washing machine control circuit includes an alarm unit connected to the controller's output. When the washing machine is in washing or spin-drying mode, if the controller does not receive a back electromotive force signal from the fuzzy detection circuit, it can determine that the washing machine door is abnormally open and activate the alarm unit via the controller's output. The alarm unit can use a conventional buzzer or flashing light alarm.

[0027] In this embodiment, see Appendix Figure 1As shown, the washing machine's functional electrical components also include a drain motor, a cold water valve, and a water level sensor. These components are connected to the washing machine's control circuit via different functional terminal interfaces. The controller manages the operation of each electrical component to achieve the washing machine's corresponding functions. In this embodiment, one end of the drain motor is connected to the washing machine's control circuit via a functional terminal interface, and the other end is connected to a second power supply via a door switch. Specifically, the drain motor's connection to the second power supply is also controlled by the door switch. The second power supply is the three-phase power supply connected to the washing machine; in practical applications, see [reference needed]. Figure 1 The door switch is set on the neutral line of the three-phase power supply. When the washing machine door is opened abnormally, the neutral line of the branch where the door switch is located is immediately disconnected, causing the drain motor and washing motor on the corresponding branch to disconnect from the second power supply, ensuring the safe operation of the washing machine. However, in this implementation scheme, the disconnection of the door switch will not affect the connection between the controller motherboard and the first power supply, allowing the washing machine control circuit to maintain the detection of the back electromotive force of the washing motor. If the back electromotive force of the washing motor cannot be detected during the washing or spin-drying function of the washing machine, the alarm unit can be driven to perform an audible and visual alarm, preventing false alarms, misreports, and missed alarms, thus improving the accuracy of the alarm action.

[0028] The circuit diagram of the fuzzy detection circuit in this embodiment is attached. Figure 2 As shown, the system comprises an input unit, an optocoupler EL817C, and an output unit. Specifically, the input unit consists of a resistor R1, a diode D1, and a diode D2 connected in series, with diode D1 connected in reverse and diode D2 connected in forward. The other end of resistor R1 is connected to the forward rotation detection terminal of the washing motor, and the other end of diode D2 is connected to the reverse rotation detection terminal of the washing motor. Both ends of diode D1 are connected to the input pins of the optocoupler EL817C. The output unit consists of transistors Q1 and Q2 and several resistors (R3-R7), connected to the output pins of the optocoupler EL817C. During normal operation of the washing motor, the signals input from the forward and reverse rotation detection terminals of the fuzzy detection circuit are converted by the optocoupler and output as pulse signals from the output unit. The controller can analyze the waveform of the received pulse signals to determine the back electromotive force of the washing motor. As mentioned above, abnormal opening of the washing machine door will ultimately lead to an abnormal pulse signal waveform, which will be detected by the controller, thus triggering the alarm unit to sound an alarm. As shown in the figure, the fuzzy detection circuit of this embodiment also includes a shaping unit composed of capacitor C1 and resistor R2. After capacitor C1 and resistor R2 are connected in parallel, one end is connected to the collector of transistor Q1 and the other end is connected to the emitter of transistor Q2. This shapes the motor detection signal, making the pulse signal waveform output by the fuzzy detection circuit of this embodiment better. The back electromotive force signal of the washing motor detected by the controller will be more accurate, thus improving the overall control accuracy.

[0029] The above description only illustrates preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. In short, all variations made within the scope of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A washing machine with fuzzy detection for the door cover, comprising a washing machine control circuit and functional electrical components of the washing machine, characterized in that: The washing machine control circuit includes a controller motherboard, a power supply, and a fuzzy detection circuit. The power supply includes a first power supply and a second power supply, and the controller motherboard is connected to the first power supply. The controller motherboard is provided with several functional terminal interfaces. The functional electrical components of the washing machine include a washing motor and a door switch. The washing motor is connected to the washing machine control circuit through the functional terminal interfaces and connected to the second power supply through the door switch. The connection between the washing motor and the second power supply is controlled by the door switch. The fuzzy detection circuit is connected to the washing motor and the controller on the controller motherboard, and is used to detect the back electromotive force of the washing motor and feed back the detection signal to the controller. The washing machine control circuit includes an alarm unit, which is connected to the output terminal of the controller. The controller controls the working state of the alarm unit according to the detection signal. When the washing machine is in the washing or spin-drying function, if the controller does not receive the back electromotive force signal of the washing motor from the fuzzy detection circuit, it will drive the alarm unit to start the alarm action through the output of the controller.

2. The washing machine with fuzzy detection of the door cover according to claim 1, characterized in that: The washing machine's functional electrical components also include a drain motor. One end of the drain motor is connected to the washing machine control circuit through a functional terminal interface, and the other end is connected to a second power source through the door switch. The connection between the drain motor and the second power source is controlled by the door switch.

3. The washing machine with fuzzy detection of the door cover according to claim 1, characterized in that: The washing machine's functional electrical components also include a cold water valve and a water level sensor, which are connected to the washing machine's control circuit through different functional terminal interfaces.

4. The washing machine with fuzzy detection of the door cover according to any one of claims 1-3, characterized in that: The second power source is a three-phase power supply connected to the washing machine.

5. The washing machine with fuzzy detection of the door cover according to claim 4, characterized in that: The door switch is located on the neutral line of the three-phase power supply.

6. The washing machine with fuzzy detection of the door cover according to claim 4, characterized in that: The fuzzy detection circuit includes an input unit, an optocoupler, and an output unit. The input unit is connected to the input pin of the optocoupler, and the signal input terminal of the fuzzy detection circuit is the forward rotation detection terminal and the reverse rotation detection terminal of the washing motor. The output unit is connected to the output pin of the optocoupler and is used to convert the output of the optocoupler into a pulse signal and output it from the output terminal of the fuzzy detection circuit. The output terminal of the fuzzy detection circuit is connected to the controller.

7. The washing machine with fuzzy detection of the door cover according to claim 6, characterized in that: The input unit is formed by connecting resistor R1, diode D1 and diode D2 in series, wherein diode D1 is connected in reverse and diode D2 is connected in forward.

8. The washing machine with fuzzy detection of the door cover according to claim 6, characterized in that: The output unit consists of transistors Q1 and Q2 and several resistors and is connected to the output pin of the optocoupler. The emitter of transistor Q1 is used as the output terminal of the fuzzy detection circuit.

9. The washing machine with fuzzy detection of the door cover according to claim 8, characterized in that: The fuzzy detection circuit also includes a shaping unit consisting of a capacitor C1 and a resistor R2. One end of the capacitor C1 and the resistor R2 are connected in parallel to the collector of the transistor Q1, and the other end is connected to the emitter of the transistor Q2.

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