Control method of washing equipment and washing equipment

Abstract

The invention discloses washing equipment and a control method thereof.The washing equipment comprises a barrel used for containing washing water and a barrel cover used for opening and closing the barrel, the pressure difference value P0 is preset, the pressure P1 and the pressure P2 borne by the inner side of the barrel cover before the barrel rotates and in the rotating process are obtained respectively, and the pressure difference value P = P2-P1 is calculated, and comparing the pressure difference value P with a preset pressure difference value P0, and if P is greater than or equal to P0, controlling to discharge part of water before washing, and / or reducing the rotating speed of the barrel in the washing process. The pressure change on the inner side of the barrel cover before and during rotation of the barrel comes from the impact of waves generated by stirring water flow by the barrel on the barrel cover, in the washing machine, after part of water is discharged before washing, the water in the barrel is reduced, and the impact of the generated waves on the barrel cover is also weakened; the rotating speed of the barrel in the washing process is controlled to be reduced, the stirring effect of the barrel on water flow can be reduced, wave impact generated by the water flow is weakened, and the possibility that the door cover generates abnormal sound and leaks water is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of household appliances, and in particular, relates to a control method for a washing device and the washing device. Background Art

[0002] Washing equipment refers to equipment that uses water to clean the laundry, mainly referring to drum washing machines.

[0003] The drum washing machine has a drum body that rotates around a horizontal central axis and a drum cover for opening and closing the drum body. During washing, the drum body contains washing water and objects to be washed, and part of the drum cover is in direct contact with the washing water. The drum body rotates around the horizontal central axis, and the washing water and objects to be washed generate waves under the action of the drum body, which impact the drum cover. When there are too many objects to be washed or too much washing water, the waves of the washing water will have a greater impact on the drum cover, causing abnormal noises from the drum cover, and even causing gaps at the joints between the drum cover and the drum body, resulting in water leakage, which brings a bad experience to users.

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

[0005] The invention provides a control method for a washing device and the washing device, the purpose of which is to eliminate abnormal noise of a drum cover during washing and to prevent water leakage of the drum cover.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] A control method for a washing device, the washing device comprising a drum for containing washing water and a drum cover for opening and closing the drum, a preset pressure difference P0, obtaining the pressures P1 and P2 on the inner side of the drum cover before and during the rotation of the drum during the washing process, calculating the pressure difference △P=P2-P1, comparing the pressure difference △P with the preset pressure difference P0, and if △P≥P0, controlling the washing to continue after part of the water is discharged, and / or controlling the rotation speed of the drum to be reduced during the washing process.

[0008] Furthermore, the method of continuing washing after draining part of the water includes: after draining part of the water, first controlling the speed of the drum to increase to a preset speed N', and then controlling the speed of the drum to decrease after rotating for a set time t1, wherein when the drum rotates at the preset speed N', the laundry is centrifugally attached to the wall in the drum.

[0009] Further, the step of continuing washing after draining part of the water includes: presetting the pressure difference value P 高 , P 高 >P0, obtain the pressure P1' on the inner side of the cylinder cover after part of the water is discharged and before the cylinder rotates, and obtain the pressure P2' on the inner side of the cylinder cover during the process of increasing the speed, calculate the pressure difference △P'=P2'-P1', and compare the pressure difference △P' with the preset pressure difference P高 The size of , if △P'≥P 高 , then control to reduce the cylinder speed.

[0010] Furthermore, the method of discharging part of the water is intermittent drainage, and the pressure P on the inner side of the cylinder cover before the cylinder body rotates after each drainage is obtained. 1排 , and obtain the pressure P on the inner side of the cylinder cover during the rotation of the cylinder 2排 , calculate the pressure difference △P 排 =P 2排 -P 1排 , compare the pressure difference △P 排 The size of the pressure difference P0 with the preset pressure, if △P 排 ≤P0, the drainage is controlled to end.

[0011] Furthermore, after the drainage is completed, water is replenished in the cylinder, and the amount of replenished water is less than the amount of drainage at a single time.

[0012] Furthermore, the water replenishment method is intermittent water replenishment. During the entire water replenishment process, the cylinder body rotates continuously, and the pressure values ​​P on the inner side of the cylinder cover before and after water replenishment are respectively obtained. 补前 , P 补后 , calculate the pressure increase △P 增 =P 补后 -P 补前 ,

[0013] Control the pressure P on the inner side of the cylinder cover after water replenishment 1补 , and obtain the pressure P on the inner side of the cylinder cover after drainage and before the cylinder rotates 2补 , calculate the pressure difference △P 补 =P 1补 -P 2补 , compare △P 补 -P0 and the maximum pressure increase value △P 增 The size of △P 补 -P0≤△P 增 , then the control water replenishment ends.

[0014] Further, after the drainage and / or water replenishment is completed, the minimum water volume value V required for washing is preset, and the water volume value V in the drum is obtained. 获 , compare the obtained water volume value V 获 The size of the preset minimum water volume value V, if V 获 <V, the control outputs a prompt message indicating that there are too many items to be washed.

[0015] Furthermore, the number of drainage times n0 is preset, the number of drainage times n currently completed is obtained, and the obtained number of drainage times n is compared with the preset number of drainage times n0. If n≥n0, the pressure difference △P is obtained.排 If the pressure difference is still greater than the preset pressure difference P0, the control outputs a prompt message indicating that there are too many items to be washed.

[0016] Furthermore, if the obtained pressure difference ΔP is greater than or equal to a preset pressure difference P0, the control outputs a prompt message indicating that there are too many items to be washed.

[0017] A washing device is controlled by any of the control methods described above.

[0018] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0019] 1. After washing starts, the pressure difference △P on the inner side of the drum cover before and after the drum rotates can reflect the strength of the impact of the water flow and the laundry on the drum cover. The larger the pressure difference △P, the stronger the impact of the water flow and the laundry on the drum cover, and the greater the possibility of abnormal noise and water leakage.

[0020] When the pressure difference △P reaches the preset pressure difference P0, it means that abnormal noise and water leakage will occur during this washing. After draining some water before washing, the water in the drum is reduced, and the impact of the waves on the drum cover is also weakened; controlling and reducing the speed of the drum during washing can reduce the stirring effect of the drum on the water flow, so that the wave impact generated by the water flow is weakened, avoiding the possibility of abnormal noise and water leakage on the door cover.

[0021] 2. After drainage, water is intermittently added to the drum. On the premise that the pressure difference △P is lower than the preset pressure difference P0, the amount of washing water in the drum can be increased as much as possible to ensure a better washing effect.

[0022] 4. The washing equipment controlled by the control method of the present invention can effectively avoid abnormal noise and water leakage caused by too much laundry in a single wash, thus bringing better user experience.

[0023] 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

[0024] 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:

[0025] Figure 1 It is a flow chart of a control method of a washing device of the present invention;

[0026] Figure 2is a flow chart of another control method of a washing device of the present invention;

[0027] Figure 3 is a flow chart of a control method of another washing device of the present invention;

[0028] Figure 4 is a flow chart of a control method of another washing device of the present invention;

[0029] Figure 5 is a flow chart of a control method of another washing device of the present invention;

[0030] Figure 6 is a flow chart of a control method of another washing device of the present invention;

[0031] Figure 7 is a flow chart of a control method of another washing device of the present invention;

[0032] Figure 8 This is a flow chart of a control method for another washing device of the present invention.

[0033] 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

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The present invention proposes a Figure 1-8 The control method and washing device of the washing device shown. The washing device refers to a device that uses water to wash the laundry, and mainly refers to a drum washing machine.

[0038] The washing device comprises a cylinder for containing washing water and a cylinder cover for opening and closing the cylinder, wherein the cylinder has an opening. During washing, the cylinder cover abuts against the opening of the cylinder to form a seal on the cylinder to prevent the washing water and the objects to be washed in the cylinder from leaking. The opening is on the side of the cylinder. During washing, the cylinder rotates around its central axis in the horizontal direction, and part of the cylinder cover is in direct contact with the washing water and the objects to be washed. The water waves generated by the rotation of the cylinder and the objects to be washed will impact the cylinder cover.

[0039] Under normal circumstances, the slight sound produced by this impact can be ignored. However, if there are too many items to be washed and too much washing water, the impact will be aggravated, causing abnormal noise, affecting the user experience, and even causing gaps at the joint of the drum cover and the drum body, causing water leakage, posing a safety hazard to the user.

[0040] To solve the above problems, the present invention proposes a control method for a washing device, such as Figure 1 As shown, the specific method is as follows:

[0041] S1: Start;

[0042] S2: preset pressure difference P0;

[0043] S3: preset detection time t;

[0044] S4: Obtain the pressure difference △P on the inner side of the cylinder cover before and after the cylinder rotates;

[0045] S5: Compare the obtained pressure difference △P with the preset pressure difference P0. If △P≥P0, execute S6, otherwise execute S7;

[0046] S6: Control to discharge part of the water before continuing washing, and / or control to reduce the speed of the drum during washing, and execute S9;

[0047] S7: Get the current washing time t', and execute S8;

[0048] S8: Determine the current washing time t' and the preset detection time t. If t'≥t, execute S9, otherwise execute S4;

[0049] S9: Continue washing and execute S10;

[0050] S10: End.

[0051] After the washing equipment starts washing, the washing water required for this washing is first added to the drum. After the washing water is added, the drum is controlled to rotate to complete the washing of the items to be washed.

[0052] The pressure difference △P refers to the initial pressure value P1 obtained on the inner side of the cylinder cover after water is added to the cylinder and before the cylinder rotates, and the pressure value P2 obtained on the inner side of the cylinder cover after the cylinder starts to rotate. The pressure difference △P is calculated as P2-P1, and the absolute value of the difference is the pressure difference △P.

[0053] At the beginning of washing, a time is preset to detect whether there is a risk of abnormal noise or leakage during washing. This time is the detection time t, which can be set to 5 minutes. During the detection time t, the pressure value on the inner side of the drum cover is obtained every 10 seconds, 6 times per minute, and the average of these 6 pressure values ​​is taken as the final pressure value obtained, and the pressure difference value P1 is obtained by subtracting the final pressure value from the initial pressure value.

[0054] Only if the pressure difference △P does not reach the preset pressure difference P0 during the entire detection time t, can it be considered that there is no risk of abnormal noise from the drum cover or leakage of washing water during this washing.

[0055] In the present invention, the impact received by the inner side of the drum cover when the drum body rotates is a direct factor determining whether abnormal noise or even leakage will occur. The pressure difference △P received by the inner side of the drum cover before and after the drum body rotates can effectively reflect the magnitude of the impact received by the inner side of the drum cover. When the pressure difference △P is large (i.e., when the impact is large), after part of the water is discharged before washing, the water in the drum body is reduced, and the impact of the generated waves on the drum cover is also weakened accordingly; controlling and reducing the rotation speed of the drum during washing can reduce the stirring effect of the drum on the water flow, thereby weakening the wave impact generated by the water flow and avoiding the possibility of abnormal noise and water leakage from the door cover.

[0056] As an embodiment of the present invention, if the obtained pressure difference △P is greater than or equal to the preset pressure difference P0, it is also possible to control the output of a prompt message indicating that there are too many items to be washed, prompting the user to reduce the amount of items to be washed to avoid excessive impact of the door body on the items to be washed during washing.

[0057] Control the washing equipment to drain part of the water before washing, so as to reduce the total amount of washing water in the drum. When the drum rotates at the same speed, the impact force generated will be significantly reduced, thus avoiding abnormal noise and leakage risks;

[0058] Controlling and reducing the amount of laundry in the drum can reduce the total weight of the contents of the drum. When the drum rotates, the laundry has a weaker ability to stir the washing water, thereby reducing the impact on the drum cover, thereby avoiding abnormal noise and leakage risks;

[0059] Controlling and lowering the rotation speed of the drum during the washing process can reduce the agitation of the drum on the washing water and the laundry, thereby reducing the impact force of the washing water and the laundry, thereby avoiding abnormal noise and leakage risks.

[0060] As an implementation method of this embodiment, as shown in the figure, in order to further reduce the impact on the cylinder cover, Figure 2 As shown, the method is as follows:

[0061] Step S6 includes:

[0062] S61: Control the washing equipment to discharge part of the water before washing;

[0063] S62: Control the cylinder speed to increase to a preset speed N';

[0064] S63: After the rotation time t1, the rotation speed of the cylinder is controlled to be reduced, and S9 is executed;

[0065] Preferably, the washing speed of the washing equipment before the drum speed is increased is N, and after the rotation time t1, the drum speed is controlled to be reduced to the washing speed N.

[0066] After the drum rotates at a preset speed N' for a time t1, the centrifugal force generated by its rotation can make the clothes adhere to the inner wall of the drum.

[0067] There are many ways to determine the preset speed N' and time t1. For example, the time consumed by making the laundry close to the inner wall of the drum at a high speed can be tested and set as the total time of the drum speed-up rotation in this embodiment.

[0068] Preferably, the preset rotation speed N' is 190 rpm.

[0069] In this embodiment, when the pressure difference △P on the inner side of the drum cover before and after the drum rotates is greater than the preset pressure difference P0, it means that the drum cover is subjected to a large impact force. Controlling the discharge of part of the washing water can reduce the impact force of the washing water on the drum cover. After that, the drum is controlled to increase the speed. The laundry near the drum mouth that may directly impact the drum cover during the drum rotation will move from the drum mouth to the side wall along the inner wall of the drum under the action of centrifugal force. After the drum speed is reduced, this part of the clothes will fall off from the inner wall of the drum and fall to a position near the middle of the drum, thereby avoiding the direct impact of this part of the clothes on the drum cover, and reducing the possibility of abnormal noise and water leakage to a certain extent.

[0070] Furthermore, when the speed of the drum is increased, the impact force on the drum cover may increase due to the increase in speed. When this impact force reaches a certain value, it may cause water leakage. To avoid this situation, Figure 3 As shown, the method is as follows:

[0071] Step S6 includes:

[0072] S61: Control the cylinder to stop rotating;

[0073] S62: Control the washing equipment to discharge part of the water before washing;

[0074] S63: Control the cylinder to resume rotation;

[0075] S64: Preset pressure difference P 高 , P 高 >P0;

[0076] S65: Control and increase the cylinder speed to a preset speed N';

[0077] S66: Control and obtain the pressure difference △P' on the inner side of the cylinder cover after the cylinder is drained and before the rotation is resumed and when the cylinder speed is increased;

[0078] S67: Compare the pressure difference △P' with the preset pressure difference P 高 If △P'≥P 高 , then execute S68, otherwise execute S69,

[0079] S68: Control to reduce the drum speed and execute S69;

[0080] S69: After the drum rotates for time t1, the drum speed is controlled to be reduced and S9 is executed;

[0081] Obtaining the pressure difference △P' when increasing the cylinder rotation speed means that the cylinder stops rotating each time before drainage, and resumes rotating after drainage, and an initial pressure value P1' on the inner side of the cylinder cover after drainage and before resumption of rotation is obtained again. When the cylinder resumes rotation and increases the rotation speed, the pressure value P2' on the inner side of the cylinder cover is continuously obtained again, and the pressure value P2' is subtracted from the re-obtained initial pressure value P1'. The absolute value of this difference is the pressure difference △P'.

[0082] Lowering the drum speed in step S66 means slightly lowering the speed based on the current speed, and the drum speed after the speed reduction is still higher than the washing speed N.

[0083] Preset pressure difference P 高 It is set according to the degree of connection between the cylinder cover and the cylinder body. When the pressure difference △P' is higher than the preset pressure difference P 高 When the cylinder cover is detached, the impact on the cylinder cover is enough to cause a gap between the cylinder cover and the cylinder body, causing the cylinder body to leak.

[0084] In this embodiment, the impact on the cylinder cover when the cylinder speed is increased is monitored. When it is monitored that the impact on the cylinder cover may cause water leakage, the cylinder speed is controlled to be reduced, thereby reducing the impact force on the cylinder cover, thereby avoiding water leakage.

[0085] As another embodiment of the present invention, after drainage, if the amount of water is still too much, abnormal noise and leakage may still occur, and if the amount of water discharged at one time is too much, it may affect the washing effect. In order to control the drainage amount and ensure that there is no risk of abnormal noise and leakage after drainage, Figure 4 As shown, the specific method is as follows:

[0086] Step S6 includes:

[0087] S61: Control the cylinder to stop rotating;

[0088] S62: Control the washing equipment to discharge part of the water before washing;

[0089] S63: Control the cylinder to resume rotation;

[0090] S64: Control and increase the cylinder speed to a preset speed N';

[0091] S65: After the drum rotates for time t1, the drum speed is controlled to be reduced to the washing speed N;

[0092] S66: Control to obtain the pressure difference △P on the inner side of the drum cover after the drum is drained last time and before it resumes rotating, and after the drum speed is reduced to the washing speed N 排 ;

[0093] S67: Compare the pressure difference value △P that is retrieved 排 The size of the preset pressure difference P0, if the pressure difference △P 排 If the pressure difference is less than the preset pressure difference value P0, execute S68, otherwise execute S61;

[0094] S68: Control the drainage to end and execute S9;

[0095] The drainage is intermittent and multiple, and a judgment of the pressure difference is performed between each drainage.

[0096] The pressure difference ΔP 排 It refers to the control to re-obtain the initial pressure value P on the inner side of the cylinder cover after the last drainage and before the cylinder resumes rotation. 1排 When the laundry is close to the inner wall of the drum and the drum speed is reduced to the washing speed N, the control re-acquires the pressure value P on the inner side of the drum cover. 2排 , the pressure value P 2排 The initial pressure value P obtained this time 1排 The absolute value of this difference is the pressure difference △P 排 .

[0097] In this embodiment, the pressure difference △P is measured after each drainage by draining the water multiple times. 排The detection method gradually obtains a pressure difference value △P that satisfies the re-acquisition 排 Under the premise that the pressure difference P0 is less than the preset value, the larger the water volume in the drum, the better the washing effect can be achieved without abnormal noise or leakage.

[0098] At the same time, in this embodiment, briefly accelerating the drum body can move the laundry away from the drum mouth, reduce the direct impact of the laundry on the drum cover, and thus reduce the pressure difference △P 排 , thereby obtaining a minimum number of drainage times, reducing the total drainage volume, retaining more washing water, and achieving better washing results.

[0099] As another embodiment of the present invention, the amount of water discharged each time is large, and the amount of water discharged may be greater than the actual amount of water to be discharged, resulting in less water involved in washing and poor washing effect. To avoid this problem, after the drainage is completed, the drum is controlled to be replenished with water, and the amount of water replenished is less than the amount of water discharged in a single time.

[0100] In this embodiment, replenishing water in the drum can prevent excessive drainage from affecting the washing effect. Supplementing an amount of water lower than the single drainage volume can improve the washing effect without causing abnormal noise and water leakage during the washing.

[0101] As an implementation method of this embodiment, when water is added to the cylinder, too much water may be added, which again causes the cylinder cover to be subjected to excessive impact, resulting in abnormal noise and leakage. To solve this problem, it is necessary to set the water addition to intermittent water addition, such as Figure 5 As shown, the specific method is as follows:

[0102] Step S68 includes:

[0103] S681: Control the water replenishment in the cylinder;

[0104] S682: Obtain the pressure increase value △P on the inner side of the cylinder cover before and after water replenishment 增 ;

[0105] S683: Obtain the pressure difference △P on the inner side of the cylinder cover before the cylinder body rotates after the current water replenishment and the current water discharge. 补 ;

[0106] S684: Determine the preset pressure difference value P0 and the pressure difference value △P 补 The difference between the maximum pressure increase value △P 增 If P0-△P 补 ≤△P 增 , then execute S685, otherwise execute S681;

[0107] S685: Control the water replenishment to end, and execute S9;

[0108] The pressure increase value ΔP 增 Refers to the pressure P on the inner side of the cylinder cover before water replenishment 补前 , the pressure P on the inner side of the cylinder cover after water replenishment 补后 , the absolute value of the difference between the two is the pressure increase value △P 增 .

[0109] The pressure difference ΔP 补 Refers to the pressure value P on the inner side of the cylinder cover obtained after this water replenishment 1补 The pressure value P on the inner side of the cylinder cover after this drainage and before the cylinder body resumes rotation 2补 Obtained by doing the difference.

[0110] In this embodiment, the washing water content in the drum is increased by intermittent water replenishment. The washing water is increased as much as possible without causing abnormal noise or water leakage to improve the washing effect. The increase in the impact force on the inner side of the drum cover each time the water is replenished is difficult to predict, so it is necessary to predict the increase caused by the previous water replenishment. When the pressure difference △P is obtained 补 The difference between the preset pressure difference value P0 is less than the pressure increase value △P caused by the previous water replenishment 增 If water is added, the pressure difference △P 补 If the pressure difference is greater than the preset value P0, it will cause abnormal noise and water leakage, so you need to stop adding water at this time.

[0111] As another implementation of this embodiment, although the above method is relatively simple in operation, it ignores the effect of each water addition on the initial pressure of the cylinder when it is stationary, making the obtained pressure difference △P 补 There is an error, the final water replenishment amount will be smaller than the maximum water replenishment amount that can actually be added. To solve this problem, Figure 6 As shown, the method is as follows:

[0112] Step S68 includes:

[0113] S681: Control the cylinder to stop rotating;

[0114] S682: Control the water replenishment in the cylinder;

[0115] S683: Control the cylinder to resume rotation;

[0116] S684: Obtain the pressure increase value △P on the inner side of the cylinder cover 增 ';

[0117] S685: Obtain the pressure difference △P on the inner side of the cylinder cover before and after the cylinder rotates after the current water replenishment 补 ';

[0118] S686: Determine the pressure difference value △P obtained this time 补 'The difference between the preset pressure difference value P0 and the maximum pressure increase value △P 增 ', if △P 补 '-P0≤△P 增 ', then execute S687, otherwise execute S681;

[0119] S687: Control the water replenishment to end, and execute S9;

[0120] In this embodiment, the cylinder is paused once before and after each water replenishment to obtain an accurate pressure difference △P 补 ', so as to more accurately judge the amount of water that can be added, and try to add more water into the drum to improve the washing effect.

[0121] As another implementation of this embodiment, when adjusting the amount of washing water, it is necessary not only to consider whether it will cause excessive impact on the drum cover, but also to consider the final washing effect. If the washing water is too little, the washing effect will be greatly reduced, and even the laundry cannot be completely soaked. To avoid this situation and cause a bad experience to the user, such as Figure 7 As shown, the method is as follows:

[0122] Step S6 includes:

[0123] S601: Control the cylinder to stop rotating;

[0124] S602: Control the washing equipment to discharge part of the water before washing;

[0125] S603: Control the cylinder to resume rotation;

[0126] S604: Control and increase the cylinder speed to a preset speed N';

[0127] S605: After the drum rotates for time t1, the drum speed is controlled to be reduced;

[0128] S606: Control and obtain the pressure difference △P on the inner side of the cylinder cover after the cylinder is drained last time and before the cylinder is restored to rotate and after the cylinder speed is reduced to the original speed 排 ;

[0129] S607: Compare the pressure difference value △P that is retrieved 排 The size of the preset pressure difference P0, if the pressure difference △P 排 If the pressure difference is less than the preset pressure difference value P0, execute S608, otherwise execute S601;

[0130] S608: Controlling water replenishment in the cylinder;

[0131] S609: Preset the minimum water volume value V;

[0132] S610: Obtain the current water volume value V in the cylinder 获 ;

[0133] S611: Compare the acquired water volume value V 获 Compared with the preset minimum water volume value V, if the water volume value V 获 If the water volume is greater than or equal to the preset minimum water volume value V, then execute S9, otherwise execute S612;

[0134] S612: Pause washing, control output of prompt information indicating that there are too many items to be washed, and execute S10;

[0135] After outputting the prompt message that there are too many items to be washed, the user can make a choice to continue washing or to take out some of the items to be washed and wash them again. If washing is continued, the washing device can continue washing directly or add some water to continue washing.

[0136] If the user chooses to take out some of the laundry and then wash it again, the washing machine needs to drain the water. The user then opens the drum cover, takes out some of the laundry, and restarts the washing machine. The washing machine re-judges whether there is a risk of abnormal noise or water leakage in the washing machine according to the method of the present invention, and further controls it.

[0137] In this embodiment, after water replenishment, the amount of washing water in the drum has decreased relative to the initial amount of water. Generally speaking, the washing water initially entering the drum is selected based on the user's choice or the information of the laundry (such as weight, degree of dirtiness, etc.), and the amount of water is relatively appropriate. After drainage and water replenishment, the amount of water is reduced, which may affect the washing effect or even make washing impossible.

[0138] At this time, it is necessary to judge the water level in the drum. If the water level can still reach the minimum water level value V, it means that it can still meet the washing needs and the washing can continue; otherwise, it may not achieve the expected washing effect, and the user needs to be prompted to take out some of the clothes to be washed and then wash them again.

[0139] The minimum water volume value V can be a single value or a set of values. When the minimum water volume value V is a single value, it should be a universal value, that is, the minimum water volume value V needs to be able to meet the needs of the washing device for washing objects of different weights.

[0140] When the minimum water volume value V is a set of values, it can be a set of minimum water volume values ​​related to factors such as the weight of the laundry, the degree of dirtiness, and the size of the laundry. During washing, the washing device selects the corresponding minimum water volume value V based on the detected relevant information (such as the detected weight information, the degree of dirtiness, the size of the laundry, etc., all of which can be obtained through existing technology or input by the user) to ensure the accuracy of the selected value.

[0141] Compared with setting the minimum water volume value as a single value, setting it as a group of values ​​can avoid the situation where the minimum water volume value V is high when there are fewer items to be washed, so that washing cannot be carried out normally after draining, or the minimum water volume value V is less than the actual demand when there are more items to be washed, so that although washing can be completed after draining, the washing effect is not good.

[0142] Furthermore, in order to increase the washing speed, water can be added after drainage without adding water, and the water volume value V in the drum can be directly obtained. 获 , and determine the water volume value V 获 Whether the minimum water volume V required for washing is reached, if it is reached, washing can be carried out directly, if not, the user can be prompted that there are too many clothes to be washed, or to add water. In this way, after the drainage is completed, if the water volume in the drum is sufficient for washing, washing can be carried out directly without adding water, thus shortening the time required for washing.

[0143] As another embodiment of the present invention, when there is too much washing water and it needs to be drained, it is necessary to drain the water several times and then repeatedly detect whether the pressure difference on the inner side of the drum cover has met the requirement. However, if the drainage detection is repeated indefinitely, it will waste a lot of time. Once the drainage times are too many, the remaining water will not meet the washing needs, and it will be meaningless to continue draining and detecting. Figure 8 As shown, the method is as follows:

[0144] Step S6 includes:

[0145] S601: record the number of drainage times n=1;

[0146] S602: Preset the number of drainage times n0;

[0147] S603: Control the cylinder to stop rotating;

[0148] S604: Control the washing equipment to discharge part of the water before washing;

[0149] S605: Control the cylinder to resume rotation;

[0150] S606: Control and increase the cylinder speed to a preset speed N';

[0151] S607: After the drum rotates for time t1, the drum speed is controlled to be reduced;

[0152] S608: Control and obtain the pressure difference △P on the inner side of the drum cover after the drum is drained last time and before it resumes rotation and after the drum speed is reduced to the original speed 排 ;

[0153] S609: Compare the re-acquired pressure difference △P 排 The size of the preset pressure difference P0, if the pressure difference △P 排 If the pressure difference is less than the preset pressure difference value P0, execute S610, otherwise execute S611;

[0154] S610: Control the water replenishment in the cylinder and execute S9;

[0155] S611: Compare the drainage times n with the preset drainage times n0, if n<n0, execute S612, otherwise execute S613;

[0156] S612: Control the drainage times n=n+1, and execute S603;

[0157] S613: Control to pause washing, output a reminder message indicating that there are too many items to be washed, and execute S10

[0158] In this embodiment, the number of drainage times is preset. When the number of drainage times reaches the preset number, it will directly prompt that there are too many clothes to be washed and stop draining, avoiding wasting time due to excessive drainage times. After multiple drainages, the amount of washing water in the drum will not be enough for washing. Even if the drainage is continued and the amount of water that does not produce abnormal noise and water leakage is found, washing cannot be continued. Therefore, ending the drainage in advance can effectively save time and improve washing efficiency.

[0159] As another embodiment of the present invention, when adding water to the drum, it is necessary to add as much washing water as possible to the drum under the premise that the pressure difference △P on the inner side of the drum cover is less than the preset pressure difference P0. However, since the increase in the pressure difference △P on the inner side of the drum cover after each water addition is not controllable, the following method can be used:

[0160] S681: Control the water replenishment in the cylinder;

[0161] S682: Preset error value P 误 ;

[0162] S683: Obtain the pressure difference △P on the inner side of the cylinder cover after the current water replenishment and the current water discharge and before the cylinder body rotates 补 ;

[0163] S684: Determine the preset pressure difference value P0 and the pressure difference value △P obtained this time 补 The difference between the two values ​​is equal to the preset error value P 误 The size of △P 补 -P0≤P 误 , then execute S685, otherwise execute S681;

[0164] S685: Control the water replenishment to end, and execute S9;

[0165] In this embodiment, when the pressure difference value P is obtained 补1 When the pressure difference is close to the preset value P0, it is considered that the maximum water replenishment has been reached and the water replenishment can be stopped. 误 , when the pressure difference △P 补 The difference between the preset pressure difference value P0 is less than P 误 When , it can be considered that the two are close.

[0166] The present invention also provides a washing device, which is controlled by the control method of the present invention. The washing device refers to a device that uses water to wash the laundry, and mainly refers to a drum washing machine.

[0167] The washing device comprises a cylinder for containing washing water and a cylinder cover for opening and closing the cylinder, wherein the cylinder has an opening. During washing, the cylinder cover abuts against the opening of the cylinder to form a seal on the cylinder to prevent the washing water and the objects to be washed in the cylinder from leaking. The opening is on the side of the cylinder. During washing, the cylinder rotates around its central axis in the horizontal direction, and part of the cylinder cover is in direct contact with the washing water and the objects to be washed. The water waves generated by the rotation of the cylinder and the objects to be washed will impact the cylinder cover.

[0168] The inner side of the drum cover is equipped with a pressure sensor for detecting the pressure exerted on the inner side of the drum cover. The pressure sensor can be located at the lower part of the inner side of the drum cover where it directly contacts the washing water, so as to directly detect the pressure exerted on the inner side of the drum cover by the water flow, the objects to be washed, etc.; or it can be installed on the abutting surface between the drum cover and the drum body. The abutting surface itself is subjected to the sealing pressure exerted by the drum cover to seal the drum body, as well as the combined effects of the pressure exerted on the drum cover by the internal water flow, the objects to be washed, etc., thereby calculating the pressure exerted on the inner side of the drum cover.

[0169] Furthermore, the washing device includes a water inlet pipeline and a drainage pipeline that can be switched on and off with the drum, and a motor that drives the drum to rotate / stop. The water inlet pipeline can feed water into the drum, and the drainage pipeline can drain the water in the drum.

[0170] In the present invention, when washing, the washing device detects the pressure difference △P on the inner side of the drum cover before and after the drum body rotates, and compares it with the preset pressure difference P0. When the detected pressure difference △P is greater than or equal to the preset pressure difference P0, it means that when the drum body rotates, the impact force of the water flow and the objects to be washed on the drum cover is too large, which will cause abnormal noise or even water leakage. Controlling the discharge of part of the water before washing can avoid the risk of abnormal noise and water leakage, so that users can get a better use experience.

[0171] 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 control method for a washing device, the washing device comprising a drum for containing washing water and a drum cover for opening and closing the drum, characterized in that: The pressure difference P0 is preset. During the washing process, the pressures P1 and P2 on the inner side of the drum cover before and during the rotation of the drum are obtained. The pressure difference △P=P2-P1 is calculated. The pressure difference △P is compared with the preset pressure difference P0. If △P≥P0, the washing process is continued after part of the water is discharged, and / or the rotation speed of the drum is reduced during the washing process.

2. A control method for a washing device according to claim 1, characterized in that: The step of continuing washing after draining part of the water comprises: After draining part of the water, the speed of the drum is first controlled to increase to a preset speed N', and then the speed of the drum is controlled to decrease after rotating for a set time t1. When the drum rotates at the preset speed N', the laundry is centrifugally attached to the wall in the drum.

3. A control method for a washing device according to claim 2, characterized in that: The step of continuing washing after draining part of the water comprises: Preset pressure difference P 高 , P 高 >P0, obtain the pressure P1' on the inner side of the cylinder cover after part of the water is discharged and before the cylinder rotates, and obtain the pressure P2' on the inner side of the cylinder cover during the process of increasing the speed, calculate the pressure difference △P'=P2'-P1', and compare the pressure difference △P' with the preset pressure difference P 高 If △P'≥P 高 , then control to reduce the cylinder speed.

4. A control method for a washing device according to any one of claims 1 to 3, characterized in that: The method of discharging part of the water is intermittent drainage, and the pressure P on the inner side of the cylinder cover before the cylinder rotates after each drainage is obtained. 1排 , and obtain the pressure P on the inner side of the cylinder cover during the rotation of the cylinder 2排 , calculate the pressure difference △P 排 =P 2排 -P 1排 , compare the pressure difference △P 排 The size of the pressure difference P0 with the preset pressure, if △P 排 ≤P0, the drainage is controlled to end.

5. A control method for a washing device according to claim 4, characterized in that: After the drainage is completed, the cylinder is controlled to be replenished with water, and the amount of water replenished is less than the single drainage amount.

6. A control method for a washing device according to claim 5, characterized in that: The water replenishment method is intermittent water replenishment. The cylinder body rotates continuously during the whole water replenishment process. The pressure value P on the inner side of the cylinder cover before and after water replenishment is obtained by control. 补前 , P 补后 , calculate the pressure increase △P 增 =P 补后 -P 补前 , Control the pressure P on the inner side of the cylinder cover after water replenishment 1补 , and obtain the pressure P on the inner side of the cylinder cover after drainage and before the cylinder rotates 2补 , calculate the pressure difference △P 补 =P 1补 -P 2补 , compare △P 补 -P0 and the maximum pressure increase value △P 增 The size of △P 补 -P0≤△P 增 , then the control water replenishment ends.

7. A control method for a washing device according to claim 5 or 6, characterized in that: After the drainage and / or water replenishment is completed, the minimum water volume value V required for washing is preset, and the water volume value V in the drum is obtained. 获 , compare the obtained water volume value V 获 The preset minimum water volume value V is the same as that of V. 获 <V, the control outputs a prompt message indicating that there are too many items to be washed.

8. A control method for a washing device according to claim 4, characterized in that: Preset drainage times n0, obtain the current completed drainage times n, compare the obtained drainage times n with the preset drainage times n0, if n≥n0, the pressure difference △P 排 If the pressure difference is still greater than the preset pressure difference P0, the control outputs a prompt message indicating that there are too many items to be washed.

9. A control method for a washing device according to claim 1, characterized in that: If the obtained pressure difference ΔP is greater than or equal to the preset pressure difference P0, the control outputs a prompt message indicating that there are too many items to be washed.

10. A washing device, characterized in that: The control method according to any one of claims 1 to 9 is adopted for control.

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