Liquid inlet control method for washing machine and washing machine

Abstract

This invention discloses a liquid dispensing control method for a washing machine and the washing machine itself. The control method includes the following steps: S1, receiving a laundry detergent dispensing command; S2, controlling a switching valve to move the valve core to a preset neutral position where it is not connected to multiple liquid inlets on the valve body; S3, controlling the switching valve to rotate the valve core to connect with the liquid inlet corresponding to the laundry detergent and dispensing it; S4, controlling the switching valve to rotate to the preset neutral position; S5, detecting whether a laundry detergent dispensing command has been received within a preset time. If yes, step S3 is executed; otherwise, the switching valve is controlled to flush with water. This invention, upon receiving a dispensing command, starts the switching valve from the preset neutral position, improving the control accuracy of the switching valve. Simultaneously, after dispensing the corresponding laundry detergent, the switching valve is controlled to return to the preset neutral position, and then the dispensing command is checked again, achieving continuous adjustment of the switching valve and increasing the practicality of the equipment.

Description

Technical Field

[0001] The present invention belongs to the field of clothing processing equipment, and in particular, relates to a liquid inlet control method of a washing machine and a washing machine. Background Art

[0002] With the development of science and technology, there are more and more types of laundry equipment, and laundry equipment is gradually developing towards intelligence. The emergence of existing automatic dispensing devices has greatly facilitated people's lives. However, the dispensing device usually needs to dispense a variety of clothing treatment agents, and multiple dispensing pumps are required to dispense them separately. The number of dispensing pumps is large, the structure is complex, and the cost is high.

[0003] The Chinese patent application number CN201420198178.7 discloses a washing machine and an automatic dispensing system thereof, including a laundry treatment agent storage box, wherein the laundry treatment agent storage box defines a plurality of laundry treatment agent storage chambers; an electromagnetic steering valve, wherein the electromagnetic steering valve has a plurality of liquid inlets and a liquid outlet, wherein the laundry treatment agent storage box is connected to the electromagnetic steering valve and the plurality of liquid inlets correspond to the plurality of laundry treatment agent storage chambers one by one; the electromagnetic steering valve is used to selectively connect one of the plurality of liquid inlets to the one liquid outlet; and a dispensing pump, wherein the dispensing pump has an inlet and an outlet, wherein the inlet of the dispensing pump is connected to the one liquid outlet. The washing machine controls the liquid outlet to be connected to one of the liquid inlets and disconnected from the remaining liquid inlets through the electromagnetic steering valve, and although the switching valve can be adjusted, the electromagnetic valve is easily limited in accuracy and cannot be adjusted continuously.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a liquid inlet and delivery control method for a washing machine and a washing machine. When the clothing treatment agent is delivered, the control accuracy of the switching valve is improved by controlling the switching valve to first rotate to a preset neutral position in which the valve core and multiple liquid inlets on the valve body are not connected. At the same time, after the corresponding clothing treatment agent is delivered, the switching valve is controlled to return to the preset neutral position again, and then the delivery instruction is received, so as to realize continuous adjustment of the switching valve and increase the practicability of the equipment.

[0006] Another object of the present invention is to provide a washing machine that realizes continuous control and improves control accuracy by controlling the state of a switching valve.

[0007] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: to provide a liquid inlet and delivery control method for a washing machine, wherein the switching valve comprises a valve core and a valve body, the valve core is provided with an inlet and an outlet, the valve body is provided with a plurality of liquid inlets and a liquid outlet, the plurality of liquid inlets comprises a water inlet;

[0008] The control method comprises the following steps:

[0009] S1, receiving a clothes treatment agent delivery instruction;

[0010] S2, controlling the switching valve so that the valve core moves to a preset neutral position that is not connected to the multiple liquid inlets on the valve body;

[0011] S3, controlling the switching valve to rotate the valve core to connect with the liquid inlet corresponding to the clothing treatment agent and to dispense the clothing treatment agent;

[0012] S4, control the switching valve to rotate to a preset neutral position;

[0013] S5, obtaining whether the clothes treatment agent is added again, if so, executing step S3, if not, controlling the switching valve to allow water to flow in for flushing.

[0014] When the washing machine starts to run, the present invention starts the switching valve from a neutral state after receiving an instruction to dispense clothing treatment agent, thereby avoiding inaccurate communication between an inlet on a valve core of the switching valve and a liquid inlet on a valve body. At the same time, after the corresponding clothing treatment agent is dispensed, the switching valve is controlled to return to a preset neutral position again, and then it is determined whether the dispensing instruction is received, thereby realizing continuous control of the switching valve, improving the control accuracy of the switching valve, and enhancing user experience.

[0015] Furthermore, it also includes a stepping motor connected to the valve core, used to drive the valve core to rotate in the valve body; a limit structure is provided at the preset neutral position, used to prevent the valve core from continuing to rotate;

[0016] In the step S2, the following steps are also included:

[0017] S21, controlling the switching valve to rotate toward a preset neutral position;

[0018] S22, detecting the stepper motor current value I;

[0019] S23, determining whether the current value I of the stepper motor is greater than or equal to a preset value I0, if so, determining that the switching valve rotates to a preset neutral position, and controlling the switching valve to stop rotating.

[0020] Furthermore, a limiting rib is provided at a preset neutral position of the valve body, and a positioning protrusion is provided at the end of the valve core; the positioning protrusion can abut against the limiting rib to limit the rotation range of the valve core;

[0021] In the step S2, the following steps are also included:

[0022] S21, controlling the switching valve to rotate toward a preset neutral position;

[0023] S22, detecting the relative position of the positioning protrusion and the limiting rib;

[0024] S23, determining whether the positioning protrusion is in contact with the limiting rib, and if so, determining that the switching valve has rotated to a preset neutral position, and controlling the switching valve to stop rotating.

[0025] Further, in said step S3, the following steps are included:

[0026] S31, obtaining a rotation direction and calculating the number of rotation steps according to a preset neutral position and a position of a liquid inlet corresponding to the placement of a laundry treatment agent;

[0027] S32, controlling the stepper motor to rotate according to the acquired rotation direction and the calculated rotation step number;

[0028] S33, adding corresponding clothing treatment agent.

[0029] Furthermore, between step S3 and step S4, the following steps are also included:

[0030] The flow rate L1 of the laundry treatment agent is detected to determine whether the flow rate L1 of the laundry treatment agent is greater than or equal to the preset flow rate L1. If so, it is determined that the laundry treatment agent has been added and step S4 is executed.

[0031] Furthermore, in the step S5, the following steps are included:

[0032] Obtain whether it is necessary to add clothing treatment agent again within the preset time T. If so, execute step S3; if not, control the switching valve to allow water to flow in for flushing.

[0033] Further, in S5, the preset time T is 1s≤T≤5s.

[0034] Furthermore, the multiple liquid inlets on the valve body 1 include a water inlet for water intake to flush the switching valve;

[0035] In step S5, if it is determined that the switching valve is controlled to be flushed with water, the following steps are included:

[0036] S51, obtaining the rotation direction and calculating the number of rotation steps according to the preset neutral position and the water inlet position;

[0037] S52, controlling the stepper motor to rotate according to the acquired rotation direction and the calculated rotation step number;

[0038] S53, control the switching valve to allow water to flow in for flushing.

[0039] The present invention also provides a washing machine, which adopts any one of the above-mentioned liquid inlet control methods for the washing machine.

[0040] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0041] (1) The present invention detects the current value of the stepper motor to determine whether the switching valve is in a preset neutral position when the clothing treatment agent is added, thereby avoiding abnormal communication between the inlet on the valve core and the multiple liquid inlets on the valve body when the switching valve is added, thereby achieving the addition of multiple clothing treatment agents and at the same time improving the control accuracy of the switching valve and enhancing the user experience.

[0042] (2) The present invention uses a stepper motor to control the operation of the switching valve, thereby realizing continuous adjustment of the neutral state, the delivery state and the flushing state of the switching valve during operation. The stepper motor rotates in corresponding directions and steps as needed to connect or disconnect the inlet on the valve core with the multiple liquid inlets on the valve body, thereby realizing the change of the state of the switching valve. The control accuracy is high, and the delivery accuracy and washing effect are improved.

[0043] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0045] Figure 1 It is a flow chart of a liquid feeding control method of a washing machine according to the present invention;

[0046] Figure 2 It is a flow chart of a liquid feeding control method of a washing machine according to the present invention;

[0047] Figure 3 It is a structural diagram of the switching valve of the present invention;

[0048] Figure 4 This is a structural diagram of the valve body and valve core of the switching valve of the present invention;

[0049] Figure 5 is a schematic diagram of the switching valve of the present invention being in a preset neutral position;

[0050] Figure 6 It is a schematic diagram of the switching valve of the present invention in a release state;

[0051] Figure 7 It is a schematic diagram of the switching valve of the present invention in a flushing state.

[0052] In the figure: 1. valve body; 11. multiple liquid inlets; 12. water inlet; 13. liquid outlet; 14. limiting rib; 2. valve core; 21. positioning convex; 22. inlet; 23. outlet; 3. stepping motor.

[0053] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0055] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0056] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] like Figures 1 to 7 As shown, a liquid inlet control method for a washing machine according to the present invention, the washing machine includes a switching valve.

[0058] The switching valve comprises a valve core 2 and a valve body 1 .

[0059] The valve body 1 is provided with a plurality of liquid inlets 11 , and the valve core 2 is rotatably installed in the valve body 1 and can be selectively connected to one of the plurality of liquid inlets 11 .

[0060] The control method comprises the following steps:

[0061] S1, receiving a clothes treatment agent delivery instruction;

[0062] S2, controlling the switching valve to move the valve core 2 to a preset neutral position where the valve core 2 is not connected to the multiple liquid inlets 11 on the valve body 1;

[0063] S3, controlling the switching valve to rotate the valve core 2 to connect with the liquid inlet corresponding to the laundry treatment agent and inject the laundry treatment agent;

[0064] S4, control the switching valve to rotate to a preset neutral position;

[0065] S5, obtaining whether the clothes treatment agent is added again, if so, executing step S3, if not, controlling the switching valve to allow water to flow in for flushing.

[0066] When the washing machine starts to run, the present invention places the switching valve in a preset neutral position after receiving a command to dispense clothing treatment agent, and then controls the clothing treatment agent in the command to be dispensed, thereby avoiding abnormal communication between the inlet 22 on the valve core 2 and the multiple liquid inlets 11 on the valve body 1 when the switching valve is dispensing clothing treatment agent. After dispensing, the switching valve returns to the neutral state again, and then obtains whether to dispense clothing treatment agent again, completes the operation of dispensing clothing treatment agent again or flushing the switching valve, thereby realizing the dispensing and continuous control of multiple clothing treatment agents, and at the same time, improving the control accuracy of the switching valve and enhancing the user experience.

[0067] Furthermore, a stepping motor 3 is also included.

[0068] The stepper motor 3 is connected to the valve core 2 and is used to drive the valve core 2 to rotate in the valve body 1 .

[0069] The preset neutral position is provided with a limiting structure for preventing the valve core 2 from continuing to rotate.

[0070] In the step S2, the following steps are included:

[0071] S21, controlling the switching valve to rotate toward a preset neutral position;

[0072] S22, detecting the current value I of the stepping motor 3;

[0073] S23, judging whether the current value I of the stepping motor 3 is greater than or equal to the preset value I0, if so, judging that the switching valve is rotated to the neutral position without release, and executing step S3.

[0074] The present invention sets the current value I of the stepper motor 3 and compares it with the current value I1 when the stepper motor 3 is running. Only when the current value I1 of the stepper motor 3 is greater than or equal to the preset current value I, it is determined that the switching valve is in the preset neutral position, and the washing machine can control the switching valve to perform the dispensing operation.

[0075] Furthermore, a limiting rib 14 is provided at a preset neutral position of the valve body 1 , and a positioning protrusion 21 is provided at the end of the valve core 2 ; the positioning protrusion 21 can abut against the limiting rib 14 to limit the rotation range of the valve core 2 .

[0076] In the step S2, the following steps are included:

[0077] S21, controlling the switching valve to rotate toward a preset neutral position;

[0078] S22, detecting the relative position of the positioning protrusion 21 and the limiting rib 14;

[0079] S23, judging whether the positioning protrusion 21 is in contact with the limiting rib 14, if so, judging that the switching valve has rotated to a preset neutral position, and controlling the switching valve to stop rotating.

[0080] The present invention sets a positioning protrusion 21 on the valve core 2 and a limiting rib 14 at the preset neutral position of the valve body 1. When it is determined that the switching valve needs to return to the neutral state, the stepper motor 3 drives the valve core 2 to rotate. When the positioning protrusion 21 on the valve core 2 abuts against the limiting rib 14 on the valve body 1, the system determines that the switching valve is in the preset neutral position.

[0081] Specifically, the positioning protrusion 21 abuts against the limiting rib 14, and the stepper motor 3 is blocked when driving the valve core 2 to rotate, and the current value will increase. Therefore, by judging whether the value of the current value I1 exceeds the preset value I of the stepper motor 3, it can be judged whether the switching valve is rotated to the preset neutral position.

[0082] When washing clothes next time, it is only necessary to detect whether the valve core 2 of the switching valve is in the preset neutral position where it is not connected to the multiple liquid inlets 11 on the valve body 1. When the switching valve is already in the preset neutral position, there is no need to control the switching valve to rotate again. The switching valve can be directly controlled to perform the feeding operation, which reduces the complexity of the second washing liquid inlet.

[0083] like Figure 5 As shown, the switching valve is rotated to a preset neutral position where the valve core 2 is not connected to the multiple liquid inlets 11 on the valve body 1, which is the neutral state of the switching valve.

[0084] Further, in said step S3, the following steps are included:

[0085] S31, obtaining a rotation direction and calculating the number of rotation steps according to a preset neutral position and a position of a liquid inlet corresponding to the placement of a laundry treatment agent;

[0086] S32, controlling the stepping motor 3 to rotate according to the acquired rotation direction and the calculated rotation step number;

[0087] S33, adding corresponding clothing treatment agent.

[0088] The present invention first determines the state of the switching valve, and can only perform the dispensing work when the state of the switching valve during dispensing is a neutral state. When dispensing, it is avoided that the clothing treatment agent fails to return to the neutral state before dispensing. The inlet 22 is connected with the liquid inlet to dispense the clothing treatment agent, thereby preventing the clothing treatment agent from being wasted or overflowing from the switching valve, thereby improving the dispensing accuracy.

[0089] Specifically, the present invention obtains the rotation direction and calculates the rotation steps according to the preset neutral position and the position of the liquid inlet corresponding to the laundry treatment agent, controls the stepper motor 3 to rotate according to the obtained rotation direction and the calculated rotation steps, and when the switching valve rotates according to the rotation direction and the rotation steps, it is determined that the liquid inlet is connected to the inlet 22 on the valve core 2, and the corresponding detergent is added, thereby realizing precise control of the laundry treatment agent addition and improving the control accuracy and user experience.

[0090] like Figure 6 As shown, the switching valve rotates the valve core 2 to communicate with the liquid inlet corresponding to the laundry treatment agent and dispenses the agent, which is the switching valve dispensing state.

[0091] Furthermore, between step S3 and step S4, the following steps are also included:

[0092] Detect the flow rate L1 of the clothing treatment agent and determine whether the flow rate L1 of the clothing treatment agent is greater than or equal to the preset flow rate L1. If so, it is determined that the clothing treatment agent has been completely added and step S4 is executed. If not, it is determined that the clothing treatment agent has not been completely added and step S33 is executed.

[0093] The present invention determines whether the addition of clothing treatment agent is completed by using the clothing treatment agent flow rate L1 in the switching valve. If the flow rate L1 is not greater than or equal to the set flow rate L, it is determined that the addition of clothing treatment agent is not completed, and the clothing treatment agent continues to be added until the clothing treatment agent addition amount L1 is greater than or equal to the set addition amount L, then it is determined that the addition of clothing treatment agent is completed, thereby improving the addition accuracy of clothing treatment agent and enhancing the washing effect of clothes.

[0094] It is also possible to determine that the clothing treatment agent has been added by detecting the clothing treatment agent addition time t1 and comparing it with the set time t. Within the set time range T, the clothing treatment agent in the switching valve can flow better into the washing tub, preventing the clothing treatment agent from remaining in the switching valve, causing blockage of the switching valve and reducing the washing effect.

[0095] In the step S4, the following steps are included:

[0096] S41, controlling the switching valve to rotate toward the preset neutral position;

[0097] S42, detecting the current value I of the stepping motor 3;

[0098] S43, determining whether the current value I of the stepper motor is greater than or equal to a preset value I0, if so, determining that the switching valve rotates to a preset neutral position, and controlling the switching valve to stop rotating.

[0099] By controlling the switching valve to return to the neutral state again after the clothing treatment agent is added, the washing machine can obtain the rotation direction of the stepper motor 3 and calculate the number of rotation steps, thereby improving the accuracy of the stepper motor 3 controlling the valve core 2 to rotate, ensuring that the inlet 22 on the valve core 2 is more accurately connected with the multiple liquid inlets 11 and water inlets 12 on the valve body 1, thereby improving the addition accuracy of the switching valve and enhancing the user experience.

[0100] Furthermore, in the step S5, the following steps are included:

[0101] Obtain whether it is necessary to add clothing treatment agent again within the preset time T. If so, execute step S3; if not, control the switching valve to allow water to flow in for flushing.

[0102] Furthermore, in the step S5, the preset time T is 1s≤T≤5s.

[0103] Preferably, the preset time T is 3s.

[0104] Specifically, after the washing machine has added detergent for the first time, when it needs to add clothes treatment agent again at a preset time T, the adding process is the same as the above-mentioned adding process. According to the preset neutral position and the position of the liquid inlet corresponding to the addition of clothes treatment agent, the rotation direction is obtained and the number of rotation steps is calculated. The stepper motor 3 is controlled to rotate according to the obtained rotation direction and the calculated number of rotation steps, and the inlet 22 on the valve core 2 is driven to be connected with the liquid inlet corresponding to the addition of clothes treatment agent, and the switching valve enters the adding state again.

[0105] Furthermore, the multiple liquid inlets 11 on the valve body 1 include a water inlet 12 for inletting water to flush the switching valve.

[0106] In step S5, if it is determined that the switching valve is controlled to be flushed with water, the following steps are included:

[0107] S51, obtaining the rotation direction and calculating the number of rotation steps according to the preset neutral position and the position of the water inlet 12;

[0108] S52, controlling the stepping motor 3 to rotate according to the acquired rotation direction and the calculated rotation step number;

[0109] S53, control the switching valve to allow water to flow in for flushing.

[0110] The present invention switches the switching valve from a neutral state to a delivery state, and returns to a neutral state after delivery is completed; when the washing machine controls the switching valve to flush, the rotation direction is obtained and the number of rotation steps is calculated according to the preset neutral position and the position of the water inlet 12 on the valve body 1, and the stepper motor 3 is controlled to rotate according to the obtained rotation direction and the calculated number of rotation steps, and it is determined whether the water inlet 12 is connected to the inlet 22 on the valve core 2, and the switching valve is controlled to flush with water, so as to prevent the clothing treatment agent from remaining in the switching valve and causing the switching valve to be blocked, thereby reducing the delivery efficiency and washing effect, and improving the delivery accuracy of the clothing treatment agent. At the same time, continuous control of the three states of the switching valve is achieved.

[0111] like Figure 7 As shown, the control switching valve water inlet flushing is the switching valve flushing state.

[0112] When controlling the water inlet flushing of the switching valve, by detecting the flushing time T1 and comparing it with the set flushing time T2, it is determined that the switching valve has been flushed and the operation is terminated to prevent long-term flushing and waste of water resources.

[0113] Specifically, an additional water path is led out from the washing machine and connected to the water inlet 12 of the switching valve, and the clothes treatment agent remaining in the circuit is flushed by tap water. The stepper motor 3 drives the opening on the valve core 2 to connect to the water inlet 12 on the valve body 1 to achieve flushing of the switching valve. At the same time, the switching valve is switched from the delivery state to the flushing state to complete the flushing of the switching valve.

[0114] After the present invention is put in or rinsed, when multiple puts are needed, after each put-in, the stepper motor 3 will drive the switch valve to return to the neutral state, which is convenient for the washing machine to rotate in the direction and calculate the number of rotation steps, and is easy to control the stepper motor 3 to rotate. The method is simple and the put-in is accurate.

[0115] The neutral state, the delivery state and the flushing state of the switching valve are all achieved by the stepping motor 3 rotating forward or reversely in the corresponding direction and number of steps to connect the pipeline.

[0116] The present invention can also use electrical signals or magnetic switches to achieve control of the switching valve.

[0117] Specifically, a permanent magnet is arranged on the valve core 2, and different magnetic induction switches are arranged at the liquid inlet of the valve body 1. When the stepper motor 3 controls the valve core 2 to rotate to a corresponding position, magnetic induction generates an electrical signal, thereby obtaining the operating state of the switching valve and realizing the delivery of clothing treatment agent.

[0118] The present invention discloses a method for controlling liquid inlet and delivery of a washing machine. When the switching valve is working, a return operation needs to be performed, that is, the initial position is a neutral state. The neutral state is determined when the limiting rib 14 on the valve body 1 contacts the positioning protrusion 21 on the valve core 2, and the stepper motor 3 is blocked. At this time, the current of the motor is greater than a preset value, indicating that the switching valve is in a neutral state. Starting from the neutral state, the stepper motor 3 rotates in a corresponding direction or number of steps according to the signal of the system, and controls the valve core 2 to be connected with multiple liquid inlets 11 or water inlets 12 on the valve body 1, thereby realizing continuous control of the three states of the switching valve, namely, the neutral state, the delivery state and the flushing state, thereby improving the control accuracy and the delivery accuracy of the clothing treatment agent, and increasing the washing effect and user experience.

[0119] The present invention also provides a washing machine, which adopts any one of the above-mentioned liquid inlet control methods for the washing machine.

[0120] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A method for controlling liquid feeding of a washing machine, characterized in that: The washing machine includes a switching valve; The switching valve comprises a valve core and a valve body, the valve body is provided with a plurality of liquid inlets, the valve core is rotatably mounted in the valve body and can be selectively connected to one of the plurality of liquid inlets; the control method comprises the following steps: S1, receiving a clothing treatment agent delivery instruction; S2, controlling the switching valve so that the valve core moves to a preset neutral position that is not connected to the multiple liquid inlets on the valve body; S3, controlling the switching valve to rotate the valve core to connect with the liquid inlet corresponding to the clothing treatment agent and to dispense the clothing treatment agent; S4, control the switching valve to rotate to a preset neutral position; S5, obtaining whether the clothes treatment agent is added again, if so, executing step S3, if not, controlling the switching valve to allow water to flow in for flushing.

2. A method for controlling liquid inflow of a washing machine according to claim 1, characterized in that: It also includes a stepper motor connected to the valve core and used to drive the valve core to rotate in the valve body; a limit structure is provided at the preset neutral position to prevent the valve core from continuing to rotate; In step S2, The following steps are included: S21, controlling the switching valve to rotate toward a preset neutral position; S22, detecting the stepper motor current value I; S23, determining whether the current value I of the stepper motor is greater than or equal to a preset value I0, if so, determining that the switching valve rotates to a preset neutral position, and controlling the switching valve to stop rotating.

3. The method for controlling liquid feeding of a washing machine according to claim 1, characterized in that: The preset neutral position of the valve body is provided with a limiting rib, and the end of the valve core is provided with a positioning protrusion; the positioning protrusion can abut against the limiting rib to limit the rotation range of the valve core; In the step S2, the following steps are included: S21, controlling the switching valve to rotate toward a preset neutral position; S22, detecting the relative position of the positioning protrusion and the limiting rib; S23, determining whether the positioning protrusion is in contact with the limiting rib, and if so, determining that the switching valve has rotated to a preset neutral position, and controlling the switching valve to stop rotating.

4. The method for controlling liquid feeding of a washing machine according to claim 1, characterized in that: In step S3, The following steps are included: S31, obtaining a rotation direction and calculating the number of rotation steps according to a preset neutral position and a position of a liquid inlet corresponding to the placement of a laundry treatment agent; S32, controlling the stepper motor to rotate according to the acquired rotation direction and the calculated rotation step number; S33, adding corresponding clothing treatment agent.

5. The method for controlling liquid feeding of a washing machine according to claim 1, characterized in that: Between step S3 and step S4, the following steps are also included: The flow rate L1 of the laundry treatment agent is detected to determine whether the flow rate L1 of the laundry treatment agent is greater than or equal to the preset flow rate L. If so, it is determined that the laundry treatment agent has been added and step S4 is executed.

6. A method for controlling liquid feeding of a washing machine according to claim 1, characterized in that: In the step S5, the following steps are included: Obtain whether it is necessary to add clothing treatment agent again within the preset time T. If so, execute step S3; if not, control the switching valve to allow water to flow in for flushing.

7. A method for controlling liquid inflow of a washing machine according to claim 6, characterized in that: In S5, the preset time T is 1s≤T≤5s.

8. A method for controlling liquid inflow of a washing machine according to claim 7, characterized in that: The preset time T is 3s.

9. The method for controlling liquid feeding of a washing machine according to claim 6, characterized in that: The multiple liquid inlets on the valve body include a water inlet for water inlet to flush the switching valve; In step S5, if it is determined that the switching valve is controlled to be flushed with water, the following steps are included: S51, obtaining the rotation direction and calculating the number of rotation steps according to the preset neutral position and the water inlet position; S52, controlling the stepper motor to rotate according to the acquired rotation direction and the calculated rotation step number; S53, control the switching valve to allow water to flow in for flushing.

10. A washing machine, characterized in that: A washing machine liquid inlet control method according to any one of claims 1 to 9 is adopted.

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