Control Method, Control Device and Washing Machine of a Washing Machine

Abstract

The present invention provides a control method, a control device and a washing machine for a washing machine, which keep the temperature of the washing water in the washing tub at the target initial temperature corresponding to the current washing within a preset time and continuously determine P; when P is less than P0, raise the temperature of the washing water in the washing tub to the target maximum temperature corresponding to the current washing according to a preset relationship and continuously determine Q, compare Q at different times, and determine that the temperature of the washing water corresponding to when Q reaches the maximum is the optimal washing temperature; there is no need to determine the optimal washing temperature by obtaining the composition of the detergent, which simplifies the process of determining the optimal washing temperature, makes the optimal washing temperature match the composition of the detergent, improves the utilization rate of the detergent and the washing effect, avoids the waste of the detergent, and solves the problems of low utilization rate of the detergent and poor washing effect; it is possible to determine the optimal washing temperature of the same detergent / laundry detergent for different washing stains.

Description

Technical Field

[0001] The present invention belongs to the technical field of washing machines, and particularly relates to a control method, a control device and a washing machine for a washing machine. Background Art

[0002] A washing machine is a household appliance with extremely wide application, which provides convenient services for people's daily life. Usually, a user needs to add a detergent, such as washing powder or liquid detergent, to the washing machine. The temperature of the washing water is a key factor affecting the washing effect of the detergent. When the detergent components are different, the required temperature of the washing water is different. In the prior art, the optimal washing temperature is determined according to the detergent components. However, in the actual use process, due to the variety of detergents, the process of obtaining the detergent components by the washing machine is cumbersome and the determination of the detergent components is inaccurate, resulting in the mismatch between the optimal washing temperature and the detergent components, thereby reducing the washing effect. Summary of the Invention

[0003] In view of this, the present invention provides a control method, a control device and a washing machine for a washing machine, so as to solve the problems in the prior art that the process of determining the detergent components by the washing machine is cumbersome and inaccurate, resulting in low utilization rate of the detergent and poor washing effect.

[0004] The present invention provides a control method for a washing machine. The washing machine includes a washing tub. The control method includes:

[0005] Controlling the washing machine to run a washing program, and keeping the temperature of the washing water in the washing tub at the target initial temperature corresponding to the current washing for a preset duration and continuously determining P;

[0006] Comparing P with P0. When P is less than P0, raising the temperature of the washing water in the washing tub to the target highest temperature corresponding to the current washing according to a preset relationship and continuously determining Q;

[0007] Comparing Q at different times, and determining the temperature of the washing water corresponding to the maximum Q as the optimal washing temperature;

[0008] Wherein, both P and Q represent the turbidity change rate of the washing water in the washing tub, and P0 represents the preset turbidity change rate of the washing water in the washing tub.

[0009] Further optionally, the control method includes:

[0010] When the current washing is the first washing, determining that both the target initial temperature and the target highest temperature corresponding to the current washing are preset values;

[0011] When the current washing is the nth washing and the detergent meets the preset conditions, determine the target initial temperature and the target maximum temperature corresponding to the current washing according to the optimal washing temperature determined during the previous washing;

[0012] Wherein, the preset condition is that the detergent is sufficient, or the detergent is insufficient and the detergent composition of the current washing is the same as that of the previous washing; n is an integer greater than 1.

[0013] Further optionally, the control method further includes:

[0014] When the current washing is the nth washing and the detergent does not meet the preset conditions, set the current washing as the first washing.

[0015] Further optionally, the determining the target initial temperature and the target maximum temperature corresponding to the current washing according to the optimal washing temperature determined during the previous washing includes:

[0016] According to the reference coefficient b, the preset temperature value △T, and the optimal washing temperature T determined during the previous washing n-1 , determine that the target initial temperature corresponding to the current washing is T n-1 - |b * △T| and the target maximum temperature is T n-1 + |b * △T|; wherein, b > 1.

[0017] Further optionally, when the current washing is the nth washing, the target initial temperature is less than the lower limit value of the reference temperature range during the first rinse in the previous washing process, and the target maximum temperature is greater than the upper limit value of the reference temperature range during the first rinse in the previous washing process.

[0018] Further optionally, when the current washing is the first washing, the control method further includes:

[0019] According to the reference coefficient a, the preset temperature value △T, and the optimal washing temperature T1 determined when the current washing is the first washing, determine the first reference temperature range as [T1 - |a * △T|, T1 + |a * △T|];

[0020] When the washing machine re-dispenses the detergent due to insufficient detergent, or when the washing machine runs the first rinse program, make the temperature of the washing water in the washing tub within the first reference temperature range; or,

[0021] When the current washing is the nth washing, the control method further includes:

[0022] According to the reference coefficient a, the preset temperature value △T, and the optimal washing temperature T determined when the current washing is the nth washingn Determine that the Nth reference temperature range is [T n - |a*△T|, T n + |a*△T|];

[0023] When the washing machine re-dispenses detergent due to insufficient detergent, or when the washing machine runs the first rinsing program, the temperature of the washing water in the washing tub is within the Nth reference temperature range.

[0024] Further optionally, the method for judging insufficient detergent includes:

[0025] Determine or calculate the total weight m1 of the clothes and the washing water in the washing tub at the start of the washing program;

[0026] After the optimal washing temperature corresponding to the current washing is determined, obtain the water level h of the washing water in the washing tub;

[0027] According to the h, obtain the total weight of the clothes and the washing water in the washing tub as m2;

[0028] According to m1 and m2, obtain Δm = m2 - m1;

[0029] Judge whether Δm is within a preset weight range;

[0030] When Δm is within the preset weight range, the detergent in the washing tub is insufficient, and the washing machine needs to re-dispense detergent;

[0031] When Δm is not within the preset weight range, the detergent in the washing tub is sufficient, and the washing machine does not need to re-dispense detergent.

[0032] Further optionally, the control method further includes:

[0033] During the current washing process, in the washing program after the first rinsing, the washing water in the washing tub is not heated.

[0034] The present invention also provides a control device for the control method of the washing machine described in any one of the above, and the control device includes:

[0035] An analysis module for comparing the P with P0; and for comparing Q at different times and determining the optimal washing temperature according to the comparison result;

[0036] A control module for controlling the washing machine to run the washing program and controlling the temperature of the washing water in the washing tub according to the comparison result of the P and P0.

[0037] The present invention also provides a washing machine including the control method of the washing machine described in any one of the above or the control device for the control method of the washing machine described above.

[0038] Compared with the prior art, the beneficial effects of the present invention mainly lie in that:

[0039] Control the washing machine to run the washing program, keep the temperature of the washing water in the washing tub at the target initial temperature corresponding to the current washing within a preset duration and continuously determine P; compare P with P0, when P is less than P0, raise the temperature of the washing water in the washing tub to the target maximum temperature corresponding to the current washing according to a preset relationship and continuously determine Q, removing the influence of the washing duration on the change rate of the turbidity of the washing water; compare Q at different times, and determine the temperature of the washing water corresponding to when Q reaches the maximum as the optimal washing temperature; there is no need to determine the optimal washing temperature by obtaining the composition of the detergent, simplifying the process of determining the optimal washing temperature, making the optimal washing temperature compatible with the composition of the detergent, improving the utilization rate and washing effect of the detergent, avoiding waste of the detergent, and solving the problem of low utilization rate of the detergent and poor washing effect caused by the incompatibility between the optimal washing temperature and the composition of the detergent; it is possible to determine the optimal washing temperature of the same detergent / laundry powder for different washing stains. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained according to the provided drawings.

[0041] The structures, ratios, sizes, etc. illustrated in this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention.

[0042] Figure 1 Schematic flow chart of Embodiment 1 of the control method for a washing machine provided by the present invention;

[0043] Figure 2 Schematic flow chart of Embodiment 2 of the control method for a washing machine provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0045] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plurality" generally includes at least two, but does not exclude the case of including at least one.

[0046] It should be understood that the term "and / or" used herein is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0047] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such commodity or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or system including the said element.

[0048] In existing washing machines, the optimal washing temperature is determined according to the detergent composition. However, in actual use, due to the variety of detergents, the process of the washing machine obtaining the detergent composition is cumbersome and the determination of the detergent composition is inaccurate, resulting in the mismatch between the optimal washing temperature and the detergent composition, thereby reducing the washing effect.

[0049] The present invention creatively provides a control method for a washing machine, which determines the optimal washing temperature of detergent / laundry powder for the current washing based on the turbidity change rate of the washing water. Considering that the washing duration affects the turbidity change rate, the temperature of the washing water is first controlled to remain unchanged within a preset duration. When the turbidity change rate is less than a preset value, the temperature of the washing water is then increased to determine the maximum turbidity change rate, and further determine the optimal washing temperature. Specifically, first, the temperature of the washing water in the washing tub is kept unchanged within a preset duration. When the turbidity change rate of the washing water is less than the preset value, the temperature of the washing water is increased according to a preset relationship. The washing water temperature corresponding to the maximum turbidity change rate is determined as the optimal washing temperature. The process is simple, the obtained optimal washing temperature is accurate, the utilization rate of the detergent and the washing effect are improved, the waste of the detergent is avoided, and the problems of low utilization rate of the detergent and poor washing effect caused by inaccurate optimal washing temperature are solved.

[0050] Embodiment 1

[0051] <Determination method>

[0052] As Figure 1 shown, this embodiment provides a control method for a washing machine. The washing machine includes a washing tub, and the control method includes:

[0053] S1. Control the washing machine to run a washing program, and keep the temperature of the washing water in the washing tub at the target initial temperature corresponding to the current washing within a preset duration and continuously determine P. Specifically, the preset duration is a preset duration, such as 10 minutes or 20 minutes, etc.

[0054] S2. Compare P with P0. When P is less than P0, increase the temperature of the washing water in the washing tub to the target maximum temperature corresponding to the current washing according to a preset relationship and continuously determine Q. Specifically, the preset relationship is the relationship between the temperature of the washing water and the washing time. For example: the temperature change rate of the washing water is T / t, where T is the temperature of the washing water and t is the time.

[0055] S3. Compare Q at different times, and determine the washing water temperature corresponding to when Q reaches the maximum as the optimal washing temperature.

[0056] Wherein, both P and Q represent the turbidity change rate of the washing water in the washing tub, and P0 represents the preset turbidity change rate of the washing water in the washing tub. Specifically, P is the turbidity change rate of the washing water at any moment during the process of keeping the temperature of the washing water at the target initial temperature corresponding to the current washing. Q is the turbidity change rate of the washing water at any moment during the process of increasing the temperature of the washing water to the target maximum temperature corresponding to the current washing according to a preset relationship. P0 is the turbidity change rate determined when the temperature of the washing water in the washing tub is kept at the target initial temperature corresponding to the current washing within a preset duration. Continuously can be in real time or at intervals of a predetermined time.

[0057] In summary, there is no need to determine the optimal washing temperature by obtaining the composition of the detergent, which simplifies the process of determining the optimal washing temperature. The obtained optimal washing temperature is accurate, making the optimal washing temperature match the composition of the detergent, improving the utilization rate of the detergent and the washing effect, avoiding the waste of the detergent, and solving the problem of low utilization rate of the detergent and poor washing effect caused by the mismatch between the optimal washing temperature and the composition of the detergent.

[0058] In view of the problem that the optimal washing temperature corresponding to the detergent with the same composition during each washing is fixed, resulting in poor washing effect, another embodiment of the present invention further proposes that the washing machine further includes a detergent box, which stores the detergent and is used to put the detergent into the washing tub; the preset values include a first preset value and a second preset value, and the control method further includes:

[0059] S01. When the current washing is the first washing, determine that the target initial temperature corresponding to the current washing is the first preset value and the target highest temperature is the second preset value; specifically, the first preset value and the second preset value can be any value between 25°C and 50°C;

[0060] S02. When the current washing is the nth washing and the detergent meets the preset conditions, determine the target initial temperature and the target highest temperature corresponding to the current washing according to the optimal washing temperature determined during the previous washing;

[0061] S03. When the current washing is the nth washing and the detergent does not meet the preset conditions, set the current washing as the first washing;

[0062] Wherein, the preset conditions are that the detergent in the detergent box is sufficient, or the detergent in the detergent box is insufficient and the composition of the detergent for the current washing is the same as that for the previous washing; n is an integer greater than 1.

[0063] Further, the step S02 includes:

[0064] According to the reference coefficient b, the preset temperature value △T and the optimal washing temperature T determined during the previous washing n-1 , determine that the target initial temperature corresponding to the current washing is T n-1 -|b*△T| and the target highest temperature is T n-1 +b*△T|; wherein, b>1; the preset temperature value △T is a preset temperature value, for example, △T is 5°C or 10°C, etc.

[0065] In addition, when the current washing is the nth washing, the target initial temperature is less than the lower limit value of the reference temperature range during the first rinsing in the previous washing process, and the target highest temperature is greater than the upper limit value of the reference temperature range during the first rinsing in the previous washing process.

[0066] In view of the problem that during the operation of the washing program of the washing machine, when the detergent is put in again or the first rinsing is performed, the temperature of the washing water is not appropriate, resulting in poor washing effect, this embodiment proposes that when the current washing is the first washing, the control method further includes:

[0067] According to the reference coefficient a, the preset temperature value ΔT, and the optimal washing temperature T1 determined when the current washing is the first washing, determine the first reference temperature range as [T1 - |a * ΔT|, T1 + |a * ΔT|]; specifically, a < b.

[0068] When the washing machine puts in the detergent again due to insufficient detergent, or when the washing machine runs the first rinsing program, make the temperature of the washing water in the washing tub within the first reference temperature range.

[0069] Furthermore, when the current washing is the nth washing, the control method further includes:

[0070] According to the reference coefficient a, the preset temperature value ΔT, and the optimal washing temperature T determined when the current washing is the nth washing n ,determine the Nth reference temperature range as [T n - |a * ΔT|, T n + |a * ΔT|];

[0071] When the washing machine puts in the detergent again due to insufficient detergent, or when the washing machine runs the first rinsing program, make the temperature of the washing water in the washing tub within the Nth reference temperature range.

[0072] In summary, making the temperature of the washing water in the washing tub within the corresponding reference temperature range improves the activity of the detergent and the washing effect, shortens the required washing duration, and avoids the situation that the temperature of the washing water is too far from the optimal washing temperature, resulting in low activity of the detergent and weak washing effect.

[0073] The method for judging insufficient detergent in the washing tub includes:

[0074] Determine or calculate the total weight of the clothes and the washing water in the washing tub at the start of the washing program as m1;

[0075] After the optimal washing temperature corresponding to the current washing is determined, obtain the water level h of the washing water in the washing tub.

[0076] According to h, obtain the total weight of the clothes and the washing water in the washing tub as m2;

[0077] According to m1 and m2, obtain Δm = m2 - m1;

[0078] Judge whether Δm is within the preset weight range; specifically, the preset weight range is [20g, 50g];

[0079] When Δm is within the preset weight range, the amount of detergent in the washing tub is insufficient, and the washing machine needs to add detergent again.

[0080] When Δm is not within the preset weight range, the amount of detergent in the washing tub is sufficient, and the washing machine does not need to add detergent again.

[0081] The control method further includes:

[0082] During the current washing process, in the washing program after the first rinsing, the washing water in the washing tub is not heated.

[0083] It should also be noted that the turbidity change rate Q has a functional relationship with time t; the method for determining that Q reaches the maximum includes:

[0084] Calculate the turbidity change rate Q of the washing water within the preset unit time at the moment of t m-1 respectively; the turbidity change rate Q of the washing water within the preset unit time at the moment of t m-1 、t m respectively; the turbidity change rate Q of the washing water within the preset unit time at the moment of t m and t m+1 respectively; the turbidity change rate Q of the washing water within the preset unit time at the moment of t m+1 ; specifically, the preset unit time represents the preset time Δt, and within the preset unit time at the moment of t m-1 refers to [t m-1 -Δt, t m-1 +Δt], for example, Δt can be 0.1s, 0.5s, etc.

[0085] Compare Q m with Q m-1 and Q m with Q m+1 ;

[0086] When Q m >Q m-1 and Q m >Q m+1 , it is determined that Q m reaches the maximum;

[0087] where m is an integer greater than 1.

[0088] The temperature T of the washing water in the washing tub has a linear relationship with time t; determining the temperature of the washing water corresponding to when Q reaches the maximum as the optimal washing temperature includes:

[0089] When Q m reaches the maximum, t = t m , determine that the temperature T of the washing water in the washing tub is T m ;

[0090] Determine the optimal washing temperature as T m .

[0091] <Control Device, Storage Medium, and Washing Machine>

[0092] This embodiment also provides a control device for the control method of the washing machine described in any one of the above, including:

[0093] An analysis module, configured to compare P with P0; and configured to compare Q at different times and determine the optimal washing temperature according to the comparison result;

[0094] A control module, configured to control the washing machine to run a washing program and control the temperature of the washing water in the washing tub according to the comparison result of P and P0.

[0095] This embodiment also provides a non-transitory computer-readable storage medium, on which program instructions are stored. When the program instructions are executed by one or more processors, the one or more processors are configured to implement the control method of the washing machine described in any one of the above.

[0096] This embodiment also provides a washing machine, including the control method of the washing machine described in any one of the above, or the control device for the control method of the washing machine described above, or the above non-transitory computer-readable storage medium.

[0097] Embodiment 2

[0098] Different from Embodiment 1, as Figure 2 shown, the washing process of the washing machine is as follows:

[0099] The first washing: (1) Main washing process: Detect the weight of the clothes, fill water in proportion to the weight of the clothes in this batch, put in more than 5 / 10 of the corresponding proportion of detergent, wash for a time of △t first, and wash with a certain rotation-stop ratio. Continuously detect the turbidity change rate of the washing water. When the turbidity change rate is less than the set value, start heating the washing water, control the temperature change rate of the washing water to be T / t, and continuously detect the turbidity change rate. When the turbidity change rate decreases within a certain temperature range or the washing water is heated to the set maximum temperature, obtain the optimal washing temperature T1 corresponding to the turbidity change rate during the temperature increase process of this batch. At this time, detect the foam of the washing water, and judge whether the detergent is added sufficiently based on the amount of foam. If the detergent is not added sufficiently, put in all the remaining undosed detergent corresponding to the weight of the clothes in this batch, and maintain the temperature within the range of T1 + a*△T (a>1) where the turbidity change rate is the largest during the temperature increase process; if the detergent is sufficient or excessive, do not add the remaining proportion and undosed detergent; specifically, during the temperature increase process of the washing water, by controlling the temperature increase change of the washing water in segments, obtain the turbidity change rate at each different temperature stage. When the turbidity change rate is particularly large within a certain temperature, it indicates that this temperature has a greater improvement on the washing effect;

[0100] (2) Rinsing process: During the first rinsing, maintain the temperature of the washing water at T1 + a * △T (a > 1); during the mth (m > 1) rinsing and subsequent processes, do not heat the water.

[0101] The nth washing: (1) Main washing process: When the detergent in the automatic dosing system of the washing machine is sufficient and no new detergent is added, more than 5 / 10 of the corresponding proportion of detergent is dispensed. First, wash for a time of △t and wash with a certain rotation-stop ratio, continuously detect the turbidity change rate of the washing water. When the turbidity change rate is less than the set value, start heating the washing water, but directly heat and maintain the temperature of the washing water within the range of T (n-1) + b * △T (b > a > 1). Continuously detect the turbidity change rate. When the turbidity change rate decreases within a certain temperature range or reaches the highest temperature within the range, obtain the best washing temperature T corresponding to the turbidity change rate during the temperature increase process of that time. n At this time, detect the foam amount of the washing water, and judge whether the detergent is added sufficiently based on the foam amount. If the detergent is not added sufficiently, add all the remaining undispensed detergent amount corresponding to the weight of the clothes of that time, and maintain the temperature within the range of T n + a * △T (a > 1); if the detergent is sufficient or excessive, do not add the remaining proportion of undispensed detergent.

[0102] Specifically, when the nth washing and n > 1, it means that the best washing temperature of the previous washing can be obtained at this time, that is, the best washing temperature of the (n - 1)th time. Instead of conducting a large-scale temperature search like the first washing, based on the temperature of the (n - 1)th washing and at the same time based on b, float within the range of △T up and down to conduct a temperature search for T (n-1) + b * △T (b > a > 1).

[0103] (2) Rinsing process: During the first rinsing, maintain the water temperature within the range of T n + a * △T (a > 1); during the mth (m > 1) rinsing and subsequent processes, do not heat the water.

[0104] T is the temperature of the washing water; a is a coefficient, representing the coefficient of the floating range based on the tentative reference best temperature. a is greater than 1, so as to expand the temperature range based on the tentative reference best temperature; b is a coefficient, representing the coefficient of the floating range based on the tentative reference best temperature. b is greater than a and greater than 1, so as to expand the temperature range based on the tentative reference best temperature; △T refers to the upper and lower temperature floating range based on the detected tentative reference best temperature.

[0105] The method for determining whether the detergent is sufficient according to the foam amount is as follows:

[0106] Before the washing machine fills with water, the weight of the laundry is pre-detected. During the water filling process, the water inflow is continuously detected and converted into weight, so as to obtain the total weight of the laundry and water in the washing machine. During the foam detection stage, the amount of foam will affect the detection of the water level frequency. For example, the pre-detected total weight of the laundry and water is m1, and the total weight of the laundry and water obtained by converting the water level frequency is m2. When m2 is much greater than m1, it indicates that there is a lot of foam in the washing tub, and the detergent is sufficient at this time; when m2 is close to m1, it can be considered that the amount of detergent added is insufficient.

[0107] The exemplary embodiments of the present disclosure have been specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, arrangements or implementation methods described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A control method for a washing machine, characterized in that, The washing machine includes a washing tub, and the control method includes: Controlling the washing machine to run a washing program, and keeping the temperature of the washing water in the washing tub at the target initial temperature corresponding to the current washing within a preset time period and continuously determining P; Comparing P with P0, and when P is less than P0, raising the temperature of the washing water in the washing tub to the target maximum temperature corresponding to the current washing according to a preset relationship and continuously determining Q; Comparing Q at different times, and determining the temperature of the washing water corresponding to when Q reaches the maximum as the optimal washing temperature; Wherein, both P and Q represent the turbidity change rate of the washing water in the washing tub, and P0 represents the preset turbidity change rate of the washing water in the washing tub.

2. The control method of the washing machine according to claim 1, characterized in that, The control method includes: When the current washing is the first washing, determining that both the target initial temperature and the target maximum temperature corresponding to the current washing are preset values; When the current washing is the nth washing and the detergent meets the preset conditions, determining the target initial temperature and the target maximum temperature corresponding to the current washing according to the optimal washing temperature determined during the previous washing; Wherein, the preset conditions are that the detergent is sufficient, or the detergent is insufficient and the detergent composition of the current washing is the same as that of the previous washing; n is an integer greater than 1.

3. The control method of the washing machine according to claim 2, characterized in that The control method further includes: When the current washing is the nth washing and the detergent does not meet the preset conditions, setting the current washing as the first washing.

4. The control method of the washing machine according to claim 2, characterized in that, The determining the target initial temperature and the target maximum temperature corresponding to the current washing according to the optimal washing temperature determined during the previous washing includes: Based on the reference coefficient b, the preset temperature value △T, and the optimal washing temperature T determined during the previous washing n-1 , determine that the target initial temperature corresponding to the current washing is T n-1 - |b * △T| and the target maximum temperature is T n-1 + |b * △T|; where b > 1.

5. The control method of the washing machine according to claim 4, characterized in that, When the current washing is the nth washing, the target initial temperature is less than the lower limit value of the reference temperature range during the first rinsing in the previous washing process, and the target maximum temperature is greater than the upper limit value of the reference temperature range during the first rinsing in the previous washing process.

6. The control method of the washing machine according to claim 1, characterized in that, When the current washing is the first washing, the control method further includes: According to the reference coefficient a, the preset temperature value △T, and the optimal washing temperature T1 determined when the current washing is the first washing, determining the first reference temperature range as [T1 - |a * △T|, T1 + |a * △T|]; When the washing machine re-dispenses the detergent due to insufficient detergent, or when the washing machine runs the first rinsing program, keeping the temperature of the washing water in the washing tub within the first reference temperature range; or, When the current washing is the nth washing, the control method further includes: Determine the Nth reference temperature range as [T n , based on the reference coefficient a, the preset temperature value △T, and the optimal washing temperature T determined when the current washing is the nth washing n - |a * △T|, T n + |a * △T|]; When the washing machine re-dispenses the detergent due to insufficient detergent, or when the washing machine runs the first rinsing program, keeping the temperature of the washing water in the washing tub within the Nth reference temperature range.

7. The control method of the washing machine according to any one of claims 2-6, characterized in that, The method for judging insufficient detergent includes: Determining or calculating the total weight m1 of the clothes and the washing water in the washing tub at the start of the washing program; After the optimal washing temperature corresponding to the current washing is determined, obtaining the water level h of the washing water in the washing tub; According to h, obtaining the total weight of the clothes and the washing water in the washing tub as m2; According to m1 and m2, obtaining Δm = m2 - m1; Determine whether Δm is within a preset weight range; When Δm is within the preset weight range, the amount of detergent in the washing tub is insufficient, and the washing machine needs to dispense detergent again; When Δm is not within the preset weight range, the amount of detergent in the washing tub is sufficient, and the washing machine does not need to dispense detergent again.

8. The control method of the washing machine according to any one of claims 1-6, characterized in that, The control method further includes: During the current washing process, in the washing program after the first rinse, the washing water in the washing tub is not heated.

9. A control device for the control method of a washing machine according to any one of claims 1-8, characterized in that, The control device includes: An analysis module for comparing P with P0 and for comparing Q at different times and determining the optimal washing temperature according to the comparison results; A control module for controlling the washing machine to run the washing program and for controlling the temperature of the washing water in the washing tub according to the comparison result of P and P0.

10. A washing machine, characterized in that, A control device including the control method of the washing machine according to any one of claims 1-8 or the control method of the washing machine according to claim 9.

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