Washing machine
By designing a power door lock control circuit in the washing machine using door hook switch, DC motor, gear and limit module, the existing electromagnetic door lock has been solved, and a quieter and safer door lock operation is achieved.
Patent Information
- Application Number
- CN202311076513.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-24
- Publication Date
- 2025-02-25
AI Technical Summary
The existing washing machine electromagnetic door locks will produce large noise when locking the door and require high-voltage AC power, which poses a safety risk.
An electric door lock is designed, which adopts a control circuit composed of door hook switch, DC motor, gear and limit module. The gear is driven to rotate through the DC motor to realize the locking or unlocking of the door lock, and the limit module generates a locking or unlocking signal to ensure the accurate switching of the door lock.
It effectively reduces the noise of electric door locks, improves user experience, and reduces safety risks by using DC voltage, and improves user safety.
Smart Images
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Abstract
Description
Technical Field
[0001] The present application relates to the field of electromechanical control technology, and in particular to a washing machine. Background Art
[0002] With the improvement of people's living standards, washing clothes with a washing machine is a common way of washing clothes. However, it is also difficult to prevent the door on the washing machine from opening abnormally during the washing process, causing the clothes to be thrown out of the washing machine. In the related art, a washing machine with an electromagnetic door lock is proposed, which generates magnetic force after energizing the two ends of the coil of the electromagnetic door lock, thereby attracting the lock head in the electromagnetic door lock to move, thereby locking or unlocking the door. However, due to its own characteristics, the electromagnetic door lock will generate a lot of noise when locked, which reduces the user experience, and the electromagnetic door lock requires high-voltage AC to work, which makes the user have a greater safety risk when accidentally touching the electric door lock. Summary of the invention
[0003] In order to solve the above technical problems, an embodiment of the present application provides a washing machine.
[0004] According to one aspect of the embodiments of the present application, a washing machine is provided, comprising: a housing; a door body opened and closed on the housing, the door body being provided with an electric door lock; the electric door lock comprising: a door hook and a door lock; a door hook switch, the door hook switch being turned on when the door hook is inserted into the door lock, and being turned off when the door hook is not inserted into the door lock; a DC motor, which rotates when a DC voltage is detected, driving a gear inside the door lock to rotate; a control circuit being provided in the housing, the control circuit comprising: a detection module, electrically connected to the door hook switch, and used to detect the state of the door hook switch; a drive module A driving module is electrically connected to the DC motor and is used to drive the DC motor to rotate; a limit module is used to generate a door lock limit signal when the electric door lock switches to the door lock state, and to generate an unlock limit signal when the electric door lock switches to the unlock state; a controller is configured to control the driving module to drive the DC motor to rotate when the detection module detects that the door hook switch is turned on, so that the limit module generates the door lock limit signal or the unlock limit signal, and determines that the electric door lock switches to the door lock state or the unlock state according to the received door lock limit signal or the unlock limit signal.
[0005] Optionally, the limit module includes a limit switch, which has a moving end, a first fixed end and a second fixed end, wherein a door lock limit signal is generated when the first fixed end is connected to the moving end, and an unlock limit signal is generated when the second fixed end is connected to the moving end; the gear is driven to rotate by the DC motor to connect the first fixed end or the second fixed end of the limit switch to the moving end.
[0006] Optionally, the limit module includes a door lock limit relay that generates the door lock limit signal after being turned on, and an unlock limit relay that generates the unlock limit signal after being turned on; the gear is driven to rotate by the DC motor to turn on the door lock limit relay or the unlock limit relay.
[0007] Optionally, the driving module includes a DC power supply and a power supply switch; one end of the power supply switch is electrically connected to the DC power supply, and the other end is electrically connected to the DC motor; the controller is also configured to control the power supply switch to be turned on when the electric door lock is switched to a locked state or an unlocked state.
[0008] Optionally, the driving module also includes a safety switch, one end of the safety switch is electrically connected to the negative pole of the DC motor, and the other end of the safety switch is grounded; the controller is also configured to control the safety switch to be turned on when the electric door lock is switched to a locked state or an unlocked state.
[0009] Optionally, the power switch and the safety switch are both electrically connected to the door hook switch; when the door hook switch is disconnected, the power switch and the safety switch are both disconnected.
[0010] Optionally, the control circuit also includes: a monitoring module, electrically connected to the driving module, for monitoring the working state of the DC motor; the controller is also configured to control the DC motor to stop working when it is determined that the working state of the DC motor monitored by the monitoring module is abnormal.
[0011] Optionally, the working status includes the working current value of the DC motor, and the monitoring module includes a first monitoring circuit, which is electrically connected to the negative pole of the DC motor and is used to output the working current value of the DC motor when the DC motor rotates; the controller is also configured to determine that the working status of the DC motor is abnormal when the working current value output by the first monitoring circuit is greater than a preset threshold.
[0012] Optionally, the monitoring module includes a second monitoring circuit, which is electrically connected to the negative pole of the DC motor and is used to output an abnormal level signal indicating that the working state of the DC motor is abnormal when the working current value of the DC motor is greater than the preset threshold value; the controller is also configured to determine that the working state of the DC motor is abnormal when receiving the abnormal level signal output by the second monitoring circuit.
[0013] Optionally, one end of the door hook switch is grounded; the detection module is electrically connected to the other end of the door hook switch, and is used to determine that the state of the door hook switch is on when a ground signal is detected, and determine that the state of the door hook switch is off when the ground signal is not detected.
[0014] In the technical solution of the embodiment of the present application, the controller controls the driving module to drive the DC motor to rotate, so that the electric door lock can be switched to the locked door state, so as to fix the door body of the washing machine on the box body to prevent the clothes from being thrown out of the washing machine. At the same time, the door hook switch is used to ensure that the controller can control the electric door lock on the door body to switch to the locked door state or unlocked door state only when the door body on the washing machine box body is in a closed state, so as to improve the safety of the door body of the washing machine when locking or unlocking the door; and based on the method of generating a lock limit signal or an unlock limit signal based on the limit module, the accuracy of determining whether the electric door lock is switched to the locked door state or the unlocked door state can be improved. At the same time, the method of locking or unlocking the door by driving the gear of the door lock to rotate by the rotation of the DC motor can effectively reduce the noise of the electric door lock, thereby improving the user's satisfaction; in addition, the DC voltage of the DC motor is lower than the AC voltage of the washing machine. When the electric door lock leaks electricity, the safety risk of the user accidentally touching the leakage electric door lock can be effectively reduced, thereby improving the safety of the user when using the washing machine. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:
[0016] Figure 1 It is a schematic structural diagram of an electric door lock shown in an exemplary embodiment of the present application.
[0017] Figure 2 It is a structural schematic diagram of a control circuit shown in an exemplary embodiment of the present application.
[0018] Figure 3 It is a schematic diagram of the structure of a detection module in a control circuit shown in an exemplary embodiment of the present application.
[0019] Figure 4 It is a schematic diagram of the structure of a limit module in a control circuit shown in an exemplary embodiment of the present application.
[0020] Figure 5 It is a structural schematic diagram of a limit module shown in another exemplary embodiment of the present application.
[0021] Figure 6 It is a schematic diagram of the structure of a driving module in a control circuit shown in an exemplary embodiment of the present application.
[0022] Figure 7 is Figure 6 A schematic diagram of the structure of another driving module is provided based on the above.
[0023] Figure 8 is Figure 2 A schematic diagram of the structure of another control circuit is provided based on the present invention.
[0024] Fig. 9 is Figure 8 A structural schematic diagram of the monitoring module in the control circuit is provided based on the above.
[0025] Fig.10 is Figure 8 A structural schematic diagram of another monitoring module is provided based on .
[0026] Fig.11 It is a flow chart of a method for controlling an electric door lock of a washing machine provided in an embodiment of the present application. DETAILED DESCRIPTION
[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of example embodiments to those skilled in the art.
[0028] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the present application.
[0029] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.
[0030] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.
[0031] It should be noted that the "multiple" mentioned in this article refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship.
[0032] The present application provides a washing machine, which includes a housing and a door body that is opened and closed on the housing. The door body is provided with an electric door lock for fixing the door body on the housing. The structural diagram of the electric door lock can be referred to Figure 1 As shown, the electric door lock 100 includes a door hook switch 110, a door hook 120, a door lock 130 and a DC motor 140. Each part will be introduced one by one below.
[0033] The door hook switch 110 is disposed in the door body, and the conduction control process of the door hook switch 110 is that the door hook switch 110 is turned on when the door hook 120 is inserted into the door lock 130 , and the door hook switch 110 is turned off when the door hook 120 is not inserted into the door lock 130 .
[0034] Based on the conduction control process of the door hook switch 110, the door hook 120 can be flexibly arranged according to actual needs. In one example, the door hook 120 can be slidably arranged in the door body, and a return spring is arranged on the door hook 120. One end of the return spring abuts against the door body, and the other end of the return spring abuts against the door hook 120. A resilient member is arranged corresponding to the moving end of the door hook switch 110. When the door body is closed toward the box body, the box body and the door hook 120 are abutted, forcing the return spring to deform, so that the door hook 120 and the moving end of the door hook switch 110 are abutted, further forcing the rebound member of the door hook switch 110 to deform, so that the moving end of the door hook switch 110 is electrically connected to the fixed end, thereby making the door hook switch 110 conductive, and when the door body is opened away from the box body, the door hook 120 and the moving end of the door hook switch 110 are reset under the rebound force of the return spring and the rebound member respectively, so that the door hook 120 and the moving end of the door hook switch 110 are separated and the moving end of the door hook switch 110 is separated from the fixed end, thereby disconnecting the door hook switch 110.
[0035] In another example, the door hook 120 can also be fixedly arranged on the box body, and correspondingly, an opening for inserting the door hook 120 is opened on the door body. When the door body approaches the box body to close the door, the door hook 120 is inserted into the opening, so that the door hook 120 and the moving end of the door hook switch 110 abut against each other, forcing the resilient member of the door hook switch 110 to deform, so that the moving end of the door hook switch 110 is electrically connected to the fixed end, thereby making the door hook switch 110 conductive, and when the door body moves away from the box body to open the door, the door hook 120 is synchronously away from the moving end of the door hook switch 110, so that the moving end of the door hook switch 110 is reset under the rebound force of the resilient member, so that the moving end of the door hook switch 110 is separated from the fixed end, and then the door hook switch 110 is disconnected.
[0036] In addition, the door hook switch can also be set as a sensor switch, that is, the sensor of the door hook switch automatically turns on when it senses that the door hook 120 is inserted into the door lock 130, and automatically turns off when it senses that the door hook 120 is not inserted into the door lock 130.
[0037] The door lock 130 and the DC motor 140 are both arranged in the door body. The DC motor 140 rotates when a DC voltage is detected, driving the gear inside the door lock 130 to rotate, so that the electric door lock 100 switches to a locked state or an unlocked state.
[0038] A control circuit for controlling the electric door lock 100 to lock or unlock the door is provided in the box. Figure 2 As shown, the control circuit 200 includes a detection module 210, a driving module 220, a limit module 230 and a controller 240, and each part will be introduced below.
[0039] The detection module 210 is electrically connected to the door hook switch 110 and is used to detect the state of the door hook switch 110 .
[0040] The driving module 220 is electrically connected to the DC motor 140 , and the driving module 220 is used to drive the DC motor 140 to rotate.
[0041] The limit module 230 is used to generate a door lock limit signal when the electric door lock 100 is switched to a door lock state, and to generate an unlock limit signal when the electric door lock 100 is switched to an unlock state.
[0042] The controller 240 is electrically connected to the detection module 210, the drive module 220 and the limit module 230 respectively. The controller 240 is configured to control the drive module 220 to drive the DC motor 140 to rotate when the detection module 210 detects that the door hook switch 110 is turned on, so that the limit module 230 generates a door lock limit signal or an unlock limit signal, and determines whether the electric door lock 100 switches to a door lock state or an unlock state according to the received door lock limit signal or unlock limit signal.
[0043] In the implementation manner of the present application, the detection module 210 may adopt a switch detection circuit or a switch relay circuit.
[0044] The detection module 210 can be set flexibly according to actual needs. In one example, the detection module 210 can be set flexibly according to actual needs. Figure 3 As shown, one end of the door hook switch 110 is grounded, and the detection module 210 is electrically connected to the other end of the door hook switch 110. When the door hook switch 110 is turned on, the detection module 210 is grounded through the door hook switch 110, so that the detection module 210 can be used to determine that the state of the door hook switch 110 is turned on when a grounding signal is detected, and determine that the state of the door hook switch 110 is turned off when no grounding signal is detected. That is, the switch detection circuit determines whether the state of the door hook switch 110 is turned on based on the grounding signal, or the switch relay circuit is set to turn on or off in response to the grounding signal, so as to determine whether the state of the door hook switch 110 is turned on through the switch relay circuit.
[0045] In another example, one end of the door hook switch 110 is electrically connected to the power supply, and the detection module 210 is electrically connected to the other end of the door hook switch 110. When the door hook switch 110 is turned on, the detection module 210 is connected to the power supply through the door hook switch 110, so that the detection module 210 can be used to determine that the state of the door hook switch 110 is turned on when a power signal is detected, and determine that the state of the door hook switch 110 is turned off when no power signal is detected, so as to improve the accuracy of the detection module 210 in determining the state of the door hook switch 110.
[0046] In the implementation manner of the present application, the configuration of the limit module 230 can be flexibly adjusted as needed. In an example, the specific configuration of the limit module 230 can refer to Figure 4 As shown. The limit module 230 includes a limit switch 310. The limit switch 310 has a moving end, a first fixed end and a second fixed end. When the first fixed end is connected to the moving end, a door lock limit signal is generated, and when the second fixed end is connected to the moving end, an unlock limit signal is generated. The control method of the moving end of the limit switch 310 can be set to drive the gear to rotate through the DC motor 140 so that the first fixed end or the second fixed end of the limit switch 310 is connected to the moving end, that is, the moving end of the limit switch 310 moves with the rotation of the gear. When the gear rotates to a position where the door lock 130 can fix the opening and closing end of the door body on the box body, the moving end of the limit switch 310 is connected to the first fixed end; when the gear rotates to a position where the door lock 130 can detach the opening and closing end of the door body from the box body, the moving end of the limit switch 310 facilitates the connection of the second fixed end. Thereby, the purpose of generating a door lock limit signal when the electric door lock 100 switches to the door lock state and generating an unlock limit signal when the electric door lock 100 switches to the unlock state is achieved.
[0047] Among them, according to Figure 4 It can be seen that the door lock limit signal and the unlock limit signal can be set as a ground signal, that is, when the controller 240 receives the ground signal through the limit switch 310, the ground signal can be used as the door lock limit signal or unlock limit signal generated by the limit switch 310. In addition, a door lock limit signal generating device can be set between the first fixed end and the controller 240, and an unlock limit signal generating device can be set between the second fixed end and the controller 240. Therefore, when the movable end of the limit switch 310 is connected to the first fixed end, the door lock limit signal generating device is grounded by the limit switch 310 to form a path, and the door lock limit signal generating device can generate a door lock limit signal output to the controller 240. When the movable end of the limit switch 310 is connected to the second fixed end, the unlock limit signal generating device is grounded by the limit switch 310 to form a path, and the unlock limit signal generating device can generate an unlock limit signal output to the controller 240.
[0048] In another example, the specific configuration of the limit module 230 can refer to Figure 5 As shown. The limit module 230 includes a door lock limit relay 410 and an unlock limit relay 420. The door lock limit relay 410 is used to generate a door lock limit signal after being turned on. The unlock limit relay 420 is used to generate an unlock limit signal after being turned on. The control mode of the door lock limit relay 410 and the unlock limit relay 420 can be set to drive the gear to rotate through the DC motor 140 so that the door lock limit relay 410 or the unlock limit relay 420 is turned on, that is, the conduction mode of the door lock limit relay 410 and the unlock limit relay 420 can be configured to cooperate with the gear, so that when the gear rotates to a position where the door lock 130 can fix the opening and closing end of the door body on the box body, the door lock limit relay 410 can be turned on to trigger the generation of the door lock limit signal; when the gear rotates to a position where the door lock 130 can detach the opening and closing end of the door body from the box body, the unlock limit relay 420 can be turned on to trigger the generation of the door lock limit signal.
[0049] In addition, the conduction mode of the door lock limit relay 410 and the unlock limit relay 420 can be set to photosensitive conduction or trigger conduction, that is, the laser used to turn on the door lock limit relay 410 or the unlock limit relay 420 is emitted by the gear trigger, or the contact used to turn on the door lock limit relay 410 or the unlock limit relay 420 is moved to the door lock limit relay 410 or the unlock limit relay 420 through the gear.
[0050] In an embodiment of the present application, when the door hook 120 abuts against the moving end of the door hook switch 110, so that the moving end of the door hook switch 110 is electrically connected to the fixed end, the door hook switch 110 is turned on, so that the detection module 210 can detect that the state of the door hook switch 110 is turned on. Correspondingly, after the detection module 210 detects that the door hook switch 110 is turned on, the controller 240 can control the drive module 220 to drive the DC motor 140 to rotate, that is, the DC motor 140 drives the gears to rotate synchronously until the door lock limit signal or unlock limit signal generated by the limit module 230 is obtained, and then it can be determined that the electric door lock 100 has switched to the door lock state or the unlock state according to the received door lock limit signal or the unlock limit signal.
[0051] Through the above implementation, the controller 240 controls the driving module 220 to drive the DC motor to rotate, so that the electric door lock 100 can be switched to the door lock state, so as to fix the door body of the washing machine on the box body to prevent the clothes from being thrown out of the washing machine. At the same time, the door hook switch 110 ensures that the controller 240 can only control the electric door lock 100 on the door body to switch to the door lock state or unlock state when the door body on the washing machine box body is in a closed state, so as to improve the safety of the door body of the washing machine when locking or unlocking the door; and based on the limit module 230, a lock limit signal or an unlock limit signal is generated. The method of using a bit signal can improve the accuracy of determining whether the electric door lock 100 is switched to a locked state or an unlocked state. At the same time, the method of locking or unlocking the door by driving the gears of the door lock 130 to rotate through the rotation of the DC motor 140 can effectively reduce the noise of the electric door lock 100, thereby improving the user's satisfaction. In addition, the DC voltage of the DC motor 140 is lower than the AC voltage of the washing machine. When the electric door lock 100 leaks electricity, the safety risk of the user accidentally touching the leaking electric door lock 100 can be effectively reduced, thereby improving the safety of the user when using the washing machine.
[0052] Figure 6 Schematic diagram of the structure of the driving module in the control circuit of the embodiment of the present application. Figure 6 As shown, the driving module 220 includes a DC power supply V1 and a power switch S1. Each part will be introduced one by one below:
[0053] The DC power supply V1 is used to supply power to the DC motor 140 . The DC voltage value of the DC power supply V1 can be set according to the rated voltage of the DC motor 140 , and is not limited here.
[0054] One end of the power switch S1 is electrically connected to the DC power source V1 , and the other end of the power switch S1 is electrically connected to the DC motor 140 .
[0055] Among them, the power switch S1 can be set as a switch relay, a thyristor, a triode or a MOS tube to control the conduction between the DC power supply V1 and the DC motor 140. Its specific setting method can be adjusted according to actual needs and is not limited here.
[0056] The controller 240 is electrically connected to the power switch S1 , and the controller 240 is further configured to control the power switch S1 to be turned on when the electric door lock 100 is switched to a door locking state or an unlocking state.
[0057] In the embodiment of the present application, based on the electrical connection between the controller 240 and the power switch S1, when the controller 240 needs to switch the electric door lock 100 to the locked door state or unlocked door state, the power switch S1 can be controlled to be turned on so that the DC power supply V1 supplies power to the DC motor 140, so that the DC motor 140 rotates based on the power supply voltage provided by the DC power supply V1, and drives the gear in the door lock 130 to rotate to the position corresponding to the locked door state or unlocked state, thereby completing the process of switching the electric door lock 100 to the locked door state or unlocked state. On the contrary, the power switch S1 is controlled to be disconnected to control the power supply of the DC motor 140 to be completely disconnected, thereby preventing the DC power supply V1 from continuously supplying power to the DC motor 140, causing the DC motor 140 to operate abnormally, resulting in damage to the electric door lock 100, thereby improving the safety of the electric door lock 100.
[0058] Figure 7 is Figure 6 A schematic diagram of the structure of a driving module is provided based on FIG. Figure 7 As shown, the driving module 220 further includes a safety switch S2. One end of the safety switch S2 is electrically connected to the negative pole of the DC motor 140, and the other end of the safety switch S2 is grounded.
[0059] The controller 240 is also electrically connected to the safety switch S2 . The controller 240 is also configured to control the safety switch S2 to be turned on when the electric door lock 100 is switched to a door locking state or an unlocking state.
[0060] The safety switch S2 is the same as the power switch S1 and can also be set as a switch relay, a thyristor, a triode or a MOS tube to achieve the purpose of controlling the negative pole of the DC motor 140 to be grounded.
[0061] In an embodiment of the present application, the safety switch S2 is only turned on when the controller 240 switches the electric door lock 100 to a locked state or an unlocked state, that is, based on the electrical connection between the controller 240 and the safety switch S2, the controller 240 controls the safety switch S2 to be turned on whenever the electric door lock 100 needs to be switched to a locked state or an unlocked state, thereby reducing the probability of the DC motor 140 being accidentally energized and rotating, causing damage to the electric door lock 100.
[0062] In addition, in the embodiment of the present application, the power switch S1 and the safety switch S2 are both electrically connected to the door hook switch 110. Based on the above connection relationship, when the door hook switch 110 is disconnected, the power switch S1 and the safety switch S2 are both disconnected, that is, only when the door hook switch 110 is turned on, that is, after the door body is closed on the box body, the positive pole of the DC motor 140 can obtain the power supply of the DC power supply V1 through the power switch S1, and accordingly, the negative pole of the DC motor 140 can be grounded through the safety switch S2, so as to operate and rotate normally, further reducing the probability of the DC motor 140 being energized by mistake, and avoiding the DC motor 140 from being energized and rotating by mistake when the door body is not closed on the box body, causing the door body to be unable to be closed on the box body and the electric door lock 100 to be unable to complete the door locking normally.
[0063] Figure 8 is Figure 2 A schematic diagram of the structure of a control circuit is provided based on FIG. Figure 8 As shown, the control circuit 200 further includes a monitoring module 510 . The monitoring module 510 is electrically connected to the DC motor 140 , and the monitoring module 510 is used to monitor the working state of the DC motor 140 .
[0064] The controller 240 is also electrically connected to the monitoring module 510 , and the controller 240 is also configured to control the DC motor 140 to stop working when the monitoring module 510 determines that the working state of the DC motor 140 monitored by the monitoring module 510 is abnormal.
[0065] In an embodiment of the present application, the working state of the DC motor 140 can be monitored by a monitoring module 510 electrically connected to the DC motor 140, and when the working state of the DC motor 140 monitored by the monitoring module 510 is determined to be abnormal, the controller 240 electrically connected to the monitoring module 510 controls the DC motor 140 to stop working, thereby reducing the probability of damage to the DC motor 140 and extending the service life of the DC motor 140.
[0066] Under the premise that the working state is the working current value of the DC motor 140, the present application Figure 8 Provided on the basis of Fig. 9 A structural diagram of a monitoring module is shown in FIG. Fig. 9 As shown, the monitoring module 510 includes a first monitoring circuit 610. The first monitoring circuit 610 is electrically connected to the negative pole of the DC motor 140, and is used to output the working current value of the DC motor 140 when the DC motor 140 rotates.
[0067] The controller 240 is electrically connected to the first monitoring circuit 610 , and the controller 240 is further configured to determine that the working state of the DC motor 140 is abnormal when the working current value output by the first monitoring circuit 610 is greater than a preset threshold.
[0068] The first monitoring circuit 610 may be an operational amplifier circuit or a comparator circuit.
[0069] In the embodiment of the present application, the first monitoring circuit 610 can obtain the working current value of the DC motor 140 when the DC motor 140 is powered and rotated by being electrically connected to the negative pole of the DC motor 140, so as to output the working current value. Correspondingly, the controller 240 can receive the working current value output by the first monitoring circuit 610 by being electrically connected to the first monitoring circuit 610, and further compare the working current value with a preset threshold value. If it is determined that the working current value is greater than the preset threshold value, it indicates that the current working current value of the DC motor 140 is above the maximum operating current of the DC motor 140, causing the DC motor 140 to be very prone to failure. Therefore, it can be determined that the working state of the DC motor 140 is abnormal, thereby controlling the DC motor 140 to stop working, and ensuring that the DC motor 140 is not easily damaged.
[0070] In addition, the first monitoring circuit 610 can also be used to output a preset fixed current value when the DC motor 140 is not rotating, that is, when the operating current value of the DC motor 140 is too low, so that the controller 240 can determine that the DC motor 140 is not rotating based on the received preset fixed current value.
[0071] Fig.10 is Figure 8 A structural diagram of a monitoring module is provided based on the Fig.10 As shown, the monitoring module 510 includes a second monitoring circuit 710. The second monitoring circuit 710 is electrically connected to the negative pole of the DC motor 140, and is used to output an abnormal level signal indicating that the working state of the DC motor 140 is abnormal when the working current value of the DC motor 140 is greater than a preset threshold.
[0072] The controller 240 is also electrically connected to the second monitoring circuit 710 . The controller 240 is also configured to determine that the working state of the DC motor 140 is abnormal when receiving an abnormal level signal output by the second monitoring circuit 710 .
[0073] The second monitoring circuit 710 may be a comparator circuit.
[0074] In an embodiment of the present application, the second monitoring circuit 710 can obtain the operating current value of the DC motor 140 when the DC motor 140 is powered and rotated by being electrically connected to the negative pole of the DC motor 140, so as to further compare the operating current value with a preset threshold value, thereby outputting an abnormal level signal indicating that the operating state of the DC motor 140 is abnormal when the operating current value of the DC motor 140 is greater than the preset threshold value.
[0075] Among them, the abnormal level signal can be set to a high level signal, that is, the second monitoring circuit 710 outputs a high level signal when the working current value of the DC motor 140 is greater than the preset threshold, so that the high level signal is output to the controller 240 as an abnormal level signal. Correspondingly, the second monitoring circuit 710 outputs a low level signal when the working current value of the DC motor 140 is lower than the preset threshold, so that the controller 240 determines that the DC motor 140 is in a normal operating state based on the received low level signal. In addition, the abnormal level signal can also be set to a low level signal as needed, and the corresponding second monitoring circuit 710 outputs a low level signal when the working current value of the DC motor 140 is greater than the preset threshold, which is not limited here.
[0076] The controller 240 is electrically connected to the second monitoring circuit 710 , and when receiving the abnormal level signal output by the second monitoring circuit 710 , it can determine that the working state of the DC motor 140 is abnormal, so as to control the DC motor 140 to stop working.
[0077] In addition, in the embodiment of the present application, the monitoring module 510 may further include a first monitoring circuit 610 and a second monitoring circuit 710, so that the controller 240 may also be configured to determine the working state of the DC motor 140 according to the received working current value and the abnormal level signal, so as to improve the accuracy of the determined working state of the DC motor 140. Among them, the priority of the abnormal level signal is higher than the priority of the working current value, so that when the controller 240 receives the abnormal level signal, the DC motor 140 is controlled to stop working without further determining whether the working voltage value output by the first monitoring circuit 610 is greater than the preset threshold value, thereby improving the speed of controlling the DC motor 140 in the abnormal working state to stop working, and further avoiding damage to the DC motor 140.
[0078] Fig.11 The present invention provides a method for controlling an electric door lock of a washing machine. Figure 1-Figure 10 The electric door lock control method of the washing machine includes the following steps S1001 to S1009:
[0079] Step S1001, obtaining a door closing signal output by a detection module to indicate that a door hook switch is turned on.
[0080] Among them, the detection module can use the grounding signal as a door closing signal, that is, when the door hook switch is turned on, the detection module is grounded through the electrical connection between the door hook switch to obtain the grounding signal for output.
[0081] Step S1002: If a door closing signal output by the detection module is obtained, the power switch is controlled to be turned on according to the control program.
[0082] Step S1003, receiving the operating current value output by the first detection circuit.
[0083] Step S1004, determining whether the received operating current value is higher than a preset threshold.
[0084] Step S1004 includes step S1005. In step S1004, if the answer is yes, it indicates that the DC motor is operating abnormally, and step S1005 is executed to control the DC motor to stop working.
[0085] Step S1006, receiving the level signal output by the second detection circuit.
[0086] Step S1007, determining whether the received level signal is an abnormal level signal.
[0087] Step S1007 includes step S1008. In step S1007, if the answer is yes, it indicates that the DC motor is operating abnormally, and step S1008 is executed to control the DC motor to stop working.
[0088] In addition, in step S1005 and step S1008, after controlling the DC motor to stop working, a fault code indicating that the working state of the DC motor is abnormal can also be sent to the display module of the washing machine for display, so that the user can check and determine the fault, thereby improving the user's satisfaction.
[0089] Step S1009, receiving the door lock limit signal or unlock limit signal generated by the limit module, responding to the door lock limit signal or unlock limit signal, controlling the DC motor to stop working, determining that the control signal has been executed, and generating an execution end mark, that is, determining that the electric door lock has switched to the door lock state or unlock state according to the door lock limit signal or unlock limit signal generated by the limit module.
[0090] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application.
[0091] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.
Claims
1. A washing machine, characterized in that: include: Box; A door body is opened and closed on the box body, and an electric door lock is provided on the door body; The electric door lock comprises: Door hooks and locks; A door hook switch, which is turned on when the door hook is inserted into the door lock, and is turned off when the door hook is not inserted into the door lock; A DC motor rotates when a DC voltage is detected, driving the gear inside the door lock to rotate; The box is provided with a control circuit, and the control circuit comprises: A detection module, electrically connected to the door hook switch, for detecting a state of the door hook switch; A driving module, electrically connected to the DC motor, and used to drive the DC motor to rotate; A limit module, used for generating a door lock limit signal when the electric door lock is switched to a door lock state, and generating an unlock limit signal when the electric door lock is switched to an unlock state; The controller is configured to control the driving module to drive the DC motor to rotate when the detection module detects that the door hook switch is turned on, so that the limit module generates the door lock limit signal or the unlock limit signal, and determines whether the electric door lock is switched to the door lock state or the unlock state according to the received door lock limit signal or the unlock limit signal.
2. The washing machine according to claim 1, characterized in that: The limit module includes a limit switch, the limit switch has a movable end, a first fixed end, and a second fixed end, the first fixed end generates a door lock limit signal when the movable end is connected, and the second fixed end generates an unlock limit signal when the movable end is connected; The gear is driven to rotate by the DC motor so that the first fixed end or the second fixed end of the limit switch is connected to the movable end.
3. The washing machine according to claim 1, characterized in that: The limit module includes a door lock limit relay that generates the door lock limit signal after being turned on, and an unlock limit relay that generates the unlock limit signal after being turned on; The gear is driven to rotate by the DC motor to turn on the door lock limit relay or the door unlock limit relay.
4. The washing machine according to claim 1, characterized in that: The driving module includes a DC power supply and a power switch; One end of the power switch is electrically connected to the DC power supply, and the other end is electrically connected to the DC motor; The controller is also configured to control the power switch to be turned on when the electric door lock is switched to a door locking state or an unlocking state.
5. The washing machine according to claim 4, characterized in that: The driving module further comprises a safety switch, one end of which is electrically connected to the negative pole of the DC motor, and the other end of which is grounded; The controller is further configured to control the safety switch to be turned on when the electric door lock is switched to a door locking state or an unlocking state.
6. The washing machine according to claim 5, characterized in that: The power switch and the safety switch are both electrically connected to the door hook switch; When the door hook switch is turned off, both the power switch and the safety switch are turned off.
7. The washing machine according to claim 1, characterized in that: The control circuit further comprises: A monitoring module, electrically connected to the driving module, and used to monitor the working state of the DC motor; The controller is also configured to control the DC motor to stop working when it is determined that the working state of the DC motor monitored by the monitoring module is abnormal.
8. The washing machine according to claim 7, characterized in that: The working state includes the working current value of the DC motor, and the monitoring module includes a first monitoring circuit, which is electrically connected to the negative pole of the DC motor and is used to output the working current value of the DC motor when the DC motor rotates; The controller is also configured to determine that the operating state of the DC motor is abnormal when the operating current value output by the first monitoring circuit is greater than a preset threshold.
9. The washing machine according to claim 7, characterized in that: The monitoring module includes a second monitoring circuit, which is electrically connected to the negative pole of the DC motor and is used to output an abnormal level signal indicating that the working state of the DC motor is abnormal when the working current value of the DC motor is greater than the preset threshold value; The controller is further configured to determine that the operating state of the DC motor is abnormal when receiving the abnormal level signal output by the second monitoring circuit.
10. The washing machine according to claim 1, characterized in that: One end of the door hook switch is grounded; the detection module is electrically connected to the other end of the door hook switch, and is used to determine that the state of the door hook switch is on when a grounding signal is detected, and determine that the state of the door hook switch is off when the grounding signal is not detected.