Backwashing method and system of water purifier, electronic equipment, storage medium and program product

Abstract

The invention provides a backwashing method and system of a water purifier, electronic equipment, a storage medium and a program product. The water purifier comprises a filter screen, and the backwashing method comprises the following steps: determining a purified water flow difference value of the water purifier according to a purified water yield change condition and a difference value coefficient of the water purifier; in response to the condition that the purified water flow difference value falls into a preset range, adjusting the initial backwashing frequency according to the use state information of the water purifier to obtain the target backwashing frequency of the water purifier; and controlling the water purifier to perform backwashing operation on the filter screen based on the target backwashing frequency. Thus, the backwashing frequency of the water purifier is dynamically adjusted according to the change condition of the purified water yield of the water purifier and the use state information of the water purifier, and the problems that water resources are wasted due to the fact that the backwashing frequency is too high and the washing effect of impurities adsorbed on a filter screen is poor due to the fact that the backwashing frequency is too low can be effectively solved. And the use experience of the user can be improved.

Description

Technical Field

[0001] The present invention relates to the field of household appliances, and in particular to a backwashing method, system, electronic equipment, storage medium and program product of a water purifier. Background Art

[0002] Water purifiers usually have a filter at the outlet of the filter element to block impurities leaking from the filter element. However, the filter will become clogged after long-term use. In order to solve the problem of filter clogging, the water purifier will backwash the filter to remove impurities adsorbed on the filter. However, the current backwashing method has a fixed frequency for the filter. If the fixed value is set too high, water resources will be wasted; if the fixed value is set too low, the impurities adsorbed on the filter will not be flushed well. Therefore, the backwashing method of the water purifier still needs to be improved. Summary of the invention

[0003] The technical problem to be solved by the present disclosure is to overcome the defect that the flushing frequency of the filter screen in the backwashing method in the prior art is preset, and to provide a backwashing method, system, electronic device, storage medium and program product for a water purifier.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] In a first aspect, a backwashing method of a water purifier is provided, wherein the water purifier comprises a filter screen, and the backwashing method comprises:

[0006] Determining the difference in the purified water flow rate of the water purifier according to the change in the purified water output of the water purifier and the difference coefficient;

[0007] In response to the difference in the purified water flow rate falling within a preset range, adjusting the initial backwash frequency according to the usage status information of the water purifier to obtain a target backwash frequency of the water purifier;

[0008] The water purifier is controlled to perform a backwash operation on the filter based on the target backwash frequency.

[0009] Optionally, determining the difference in purified water flow rate of the water purifier according to the change in purified water output of the water purifier and the difference coefficient includes:

[0010] Obtain the first clean water output before flushing the filter for the tth time, the second clean water output after flushing the filter for the t-1th time, the third clean water output before flushing the filter for the t-1th time, and the fourth clean water output after flushing the filter for the t-2th time; wherein the tth flushing is the latest flushing; t is a positive integer greater than 2;

[0011] Calculating a first difference between the first purified water output and the second purified water output and a second difference between the third purified water output and the fourth purified water output;

[0012] The net water flow difference is calculated according to the first difference, the second difference and the difference coefficient.

[0013] Optionally, the calculation formula of the net water flow difference is as follows:

[0014] U(t)=K p *e(t)+K i *∑e(t)+K d *(e(t)-e(t-1));

[0015] Wherein, U(t) is the net water flow difference; e(t) is the first difference; e(t-1) is the second difference; K p , K i , K d is the difference coefficient.

[0016] Optionally, before the step of determining the difference in the purified water flow rate of the water purifier according to the change in the purified water output of the water purifier and the difference coefficient, the step includes:

[0017] Obtain the preset step response curve and initial difference coefficients K′p, K′ corresponding to the change in the purified water output i , K′ d ;

[0018] Iteratively adjust the initial difference coefficient K′ p , K′ i , K′ d ; To adjust the net water flow difference curve corresponding to the net water flow difference U(e);

[0019] In response to the net water flow difference curve being infinitely close to the preset step response curve, the coefficient in the net water flow difference curve is used as the difference coefficient K p , K i , K d .

[0020] Optionally, the backwashing method further comprises:

[0021] In response to the total purified water output of the water purifier being greater than or equal to a first preset threshold, adjusting the difference coefficient so that the purified water flow difference falls within a preset range;

[0022] In response to the difference in the purified water flow rate falling within a preset range, adjusting the initial backwash frequency to obtain a target backwash frequency of the water purifier;

[0023] and / or,

[0024] In response to the usage time of the water purifier being greater than or equal to a second preset threshold, adjusting the difference coefficient so that the difference in the purified water flow rate falls within a preset range;

[0025] In response to the difference in the purified water flow rate falling within a preset range, the initial backwash frequency is adjusted to obtain a target backwash frequency of the water purifier.

[0026] Optionally, the usage status information includes the usage time of the water purifier; the usage time of the water purifier is positively correlated with the target backwashing frequency;

[0027] and / or;

[0028] The usage status information includes water hardness; the water hardness is positively correlated with the target backwash frequency.

[0029] In a second aspect, a backwashing system of a water purifier is provided, wherein the water purifier comprises a filter screen; the backwashing system is used to perform any of the backwashing methods described above; the backwashing system comprises:

[0030] A determination module, used to determine the difference in purified water flow of the water purifier according to the change in purified water output of the water purifier and the difference coefficient;

[0031] A response module, configured to adjust the initial backwash frequency according to the use status information of the water purifier in response to the difference in the purified water flow rate falling into a preset range, so as to obtain a target backwash frequency of the water purifier;

[0032] A control module is used to control the water purifier to perform a backwash operation on the filter based on the target backwash frequency.

[0033] Optionally, the determining module includes:

[0034] An acquisition unit is used to acquire a first clean water output before flushing the filter for the tth time, a second clean water output after flushing the filter for the t-1th time, a third clean water output before flushing the filter for the t-1th time, and a fourth clean water output after flushing the filter for the t-2th time; wherein the tth flushing is the latest flushing; and t is a positive integer greater than 2;

[0035] A first calculation unit, used for calculating a first difference between the first purified water output and the second purified water output and a second difference between the third purified water output and the fourth purified water output;

[0036] The second calculation unit is used to calculate the net water flow difference according to the first difference, the second difference and the difference coefficient.

[0037] Optionally, the determination module determines the net water flow difference by the following calculation formula;

[0038] U(t)=K p *e(t)+K i *∑e(t)+K d *(e(t)-e(t-1));

[0039] Wherein, U(t) is the net water flow difference; e(t) is the first difference; e(t-1) is the second difference; K p , K i , K d is the difference coefficient.

[0040] Optionally, the backwash system further comprises:

[0041] The acquisition module is used to obtain the preset step response curve and initial difference coefficient K' corresponding to the change of the purified water output p , K′ i , K′ d ;

[0042] Iteration module, used for iteratively adjusting the initial difference coefficient K′ p , K′ i , K′ d ; To adjust the net water flow difference curve corresponding to the net water flow difference U(t);

[0043] The second response module is used to respond to the net water flow difference curve being infinitely close to the preset step response curve, and use the coefficient in the net water flow difference curve as the difference coefficient K p , K i , K d .

[0044] A second acquisition unit is used to acquire a step response curve corresponding to the change of the purified water output;

[0045] A determination unit is used to adjust the difference coefficient according to the change characteristics of the step response curve to determine the net water flow difference.

[0046] Optionally, the backwash system further comprises:

[0047] A first adjustment module, configured to adjust the difference coefficient to determine the difference in the purified water flow rate in response to the total purified water output of the water purifier being greater than or equal to a first preset threshold;

[0048] A first adjustment module, configured to adjust the initial backwashing frequency in response to the difference in the purified water flow rate falling within a preset range, so as to obtain a target backwashing frequency of the water purifier;

[0049] and / or,

[0050] A second adjustment module, in response to the use time of the water purifier being greater than or equal to a second preset threshold, adjusts the difference coefficient to determine the purified water flow difference;

[0051] The second regulating module adjusts the initial backwashing frequency in response to the difference in the purified water flow rate falling into a preset range to obtain a target backwashing frequency of the water purifier.

[0052] In a third aspect, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and used to run on the processor, wherein the processor implements any of the above-mentioned backwashing methods when executing the computer program.

[0053] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored, characterized in that when the computer program is executed by a processor, the backwashing method described in any one of the above items is implemented.

[0054] In a fifth aspect, a computer program product is provided, comprising a computer program, wherein when the computer program is executed by a processor, the backwashing method described in any one of the above is implemented.

[0055] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present disclosure.

[0056] The positive progress of the present disclosure is that the present disclosure not only adjusts the backwash frequency of the water purifier dynamically according to the change of the water output of the water purifier, but also according to the use status information of the water purifier, so as to effectively avoid the problem that the backwash frequency is too high and wastes water resources, and the backwash frequency is too low and causes the impurities adsorbed on the filter to be washed poorly, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 A schematic diagram of a water circuit of a water purifier in a backwashing method of a water purifier provided in exemplary embodiment 1 of the present disclosure;

[0058] Figure 2 A schematic diagram of a filter assembly in a backwashing method for a water purifier provided in exemplary embodiment 1 of the present disclosure;

[0059] Figure 3 A flow chart of a backwashing method for a water purifier provided in exemplary embodiment 1 of the present disclosure;

[0060] Figure 4 A working flow chart of a backwashing method for a water purifier provided in exemplary embodiment 1 of the present disclosure.

[0061] Figure 5 A schematic diagram of a module of a backwash system of a water purifier provided in exemplary embodiment 2 of the present disclosure;

[0062] Figure 6 It is a schematic structural diagram of an electronic device shown in exemplary embodiment 3 of the present disclosure. DETAILED DESCRIPTION

[0063] The present disclosure is further described below by way of examples, but the present disclosure is not limited to the scope of the examples.

[0064] Prefixes such as "first" and "second" are used in the embodiments of the present disclosure only to distinguish different description objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present disclosure does not constitute a limitation on the described objects. For the statement of the described objects, please refer to the description in the context of the embodiments, and no unnecessary limitation should be constituted due to the use of such prefixes. In addition, in the description of the present embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0065] Example 1

[0066] Figure 1 A schematic diagram of a water purifier water circuit of a water purifier backwashing method provided by exemplary embodiment 1 of the present disclosure, combined with Figure 1 , explaining the working principle of the water purifier.

[0067] When the water purifier needs to backwash the filter, the controller ( Figure 3 The first solenoid valve 317 and the second solenoid valve 314 are controlled to open and the third solenoid valve 315 is closed, so that the water flow entering from the water inlet 311 passes through the filter element 312, the first one-way valve 316, the first solenoid valve 317, the backwash water inlet of the filter component 318, the pressure ring in the filter component 318 and the filter screen in the filter component 318 in sequence to flush the filter screen, and then the water flow with impurities passes through the backwash water outlet of the filter component 318, the second one-way valve 323 and the second solenoid valve 314 in sequence and is sent to the wastewater outlet 313 of the water purifier.

[0068] When the water purifier needs to flow out purified water, the controller ( Figure 3(not shown) controls the first solenoid valve 317 and the second solenoid valve 314 to close and opens the third solenoid valve 315 and the water valve assembly 319, so that the water flow entering from the water inlet 311 is filtered into the clean water flow by the filter element 312, the third solenoid valve 315, the clean water inlet of the filter assembly 318, the pressure ring in the filter assembly 318 and the filter screen in the filter assembly 318 in sequence, and then the clean water flow is sent to the water outlet 322 of the water purifier through the filter assembly 318, the water valve assembly 319, the flow meter 320 and the DC pump 321 in sequence. It should be noted that the water valve assembly 319 is used to stabilize the outlet water pressure of the clean water flow, and the controller controls the on-off of the clean water waterway by controlling the opening and closing of the water valve in the water valve assembly 319; the flow meter 320 is used to count the water production of the waterway; and the DC pump 321 is used to provide water pressure to ensure water outlet.

[0069] The structure of the filter assembly 318 is as follows: Figure 2 As shown: the backwash water inlet (not shown in the figure) and the backwash water outlet (not shown in the figure) are arranged on the wall of the filter pipeline; the backwash water inlet is connected to the water inlet of the water purifier; the backwash water outlet is connected to the wastewater outlet of the water purifier; the filter screen and the pressurizing ring are sequentially arranged in the filter pipeline between the backwash water outlet and the backwash water inlet; wherein the maximum outer diameter of the pressurizing ring is less than or equal to the inner diameter of the filter pipeline.

[0070] When the filter is cleaned, the water flow entering from the backwash inlet will flush the pressure ring to the side of the filter. Since the inner diameter of the pressure ring is smaller than the inner diameter of the filter pipeline, the water flow through the pressure ring will increase the pressure of the water flow through the filter, so that the impurities adsorbed on the filter can be more effectively washed away. After backwashing, the water flow carrying impurities flows from the backwash outlet to the wastewater outlet of the water purifier. It should be noted that in order to prevent the purified water of the water purifier from being contaminated by impurities in the water flow after backwashing, the backwashing process of the filter will be carried out when the user is not using the water purifier. In addition, by using the limit groove to limit the moving range of the pressure ring, the pressure ring can only move between the filter end and the limit groove, thereby avoiding excessive movement of the pressure ring in the filter pipeline. This can not only enhance the pressurization effect of the pressure ring on the water flow, but also avoid wear on other parts of the filter assembly. In addition, the limit groove can enable the pressure ring to work in the best position, thereby improving the stability and reliability of the entire filter assembly.

[0071] In order to dynamically adjust the backwashing frequency of a water purifier, embodiment 1 of the present invention provides a backwashing method for a water purifier. Figure 3 A flow chart of a backwashing method for a water purifier provided in exemplary embodiment 1 of the present disclosure, the backwashing method comprising the following steps:

[0072] Step 101: Determine the difference in purified water flow of the water purifier according to the change in purified water output of the water purifier and the difference coefficient.

[0073] Step 102: In response to the difference in the purified water flow rate falling within a preset range, the initial backwash frequency is adjusted according to the usage status information of the water purifier to obtain a target backwash frequency of the water purifier.

[0074] The preset range is an interval in the normal distribution of the difference in purified water flow. If the difference in purified water flow falls within this interval, the initial backwash frequency is adjusted according to the usage status information of the water purifier. If it does not fall within this interval, the next step is not performed.

[0075] Step 103: Control the water purifier to perform backwashing operation on the filter based on the target backwashing frequency.

[0076] In this embodiment, the backwash frequency of the water purifier is dynamically adjusted not only by the change of the water output of the water purifier, but also by the usage status information of the water purifier, so that the problem of wasting water resources due to too high backwash frequency and poor flushing effect of impurities adsorbed on the filter due to too low backwash frequency can be effectively avoided, thereby improving the user experience.

[0077] In one embodiment, determining the difference in purified water flow of the water purifier according to the change in purified water output of the water purifier and the difference coefficient includes:

[0078] S1: Obtain the first clean water output before the t-th flushing of the filter, the second clean water output after the t-1-th flushing of the filter, the third clean water output before the t-1-th flushing of the filter, and the fourth clean water output after the t-2-th flushing of the filter; wherein the t-th flushing is the latest flushing; t is a positive integer greater than 2;

[0079] S2: Calculate a first difference between the first purified water output and the second purified water output and a second difference between the third purified water output and the fourth purified water output;

[0080] S3: Calculate the net water flow difference according to the first difference, the second difference and the difference coefficient.

[0081] The difference in purified water output after two consecutive backwashings provided by the first difference and the second difference can reflect the filter element status and filtering effect of the water purifier. For example, if the two differences are greatly different, the filtering effect of the filter element may be reduced, which will cause more impurities to leak out of the filter element, and then more impurities on the filter screen.

[0082] In this embodiment, not only can the purified water flow difference be calculated more accurately according to the first difference and the second difference, but also the filter element status and filtering effect of the water purifier can be reflected so as to better adjust the backflushing frequency.

[0083] In one embodiment, the calculation formula of the net water flow difference is as follows:

[0084] U(t)=K p *e(t)+K i *∑e(t)+K d *(e(t)-e(t-1));

[0085] Among them, U(t) is the net water flow difference; e(t) is the first difference; e(t-1) is the second difference; K p , K i , K d is the difference coefficient.

[0086] Preferably, a position PID controller can be used to execute the above calculation formula, and K p , K i , K d Set as PID coefficients respectively.

[0087] In this embodiment, the formula can be used to more accurately calculate the net water flow difference.

[0088] In one embodiment, the difference coefficient is adjusted according to the change characteristics of the step response curve corresponding to the change in the purified water output to determine the interpolation coefficient.

[0089] In one embodiment, according to the change of the purified water output of the water purifier and the difference coefficient, the step of determining the purified water flow difference of the water purifier includes:

[0090] S1: Obtain the preset step response curve and initial difference coefficient K′ corresponding to the change of purified water output p ′ , K′ i ′, K′ d .

[0091] It should be noted that, in addition to the step response curve, other curves that can reflect the change in the purified water output can also be used.

[0092] S2: Iteratively adjust the initial difference coefficient K′ p , K′ i , K′ d ; To adjust the net water flow difference curve corresponding to the net water flow difference U(t).

[0093] S3: In response to the net water flow difference curve being infinitely close to the preset step response curve, the coefficient in the net water flow difference curve is used as the difference coefficient K p , K i , K d .

[0094] The so-called net water flow difference curve is close to the preset step response curve means that the similarity between the net water flow difference curve and the preset step response curve is greater than the similarity threshold. The similarity threshold can be set according to actual conditions.

[0095] In this embodiment, the initial difference coefficient can be optimized through iterative adjustment, so that the obtained difference coefficient can more accurately calculate the net water flow difference, thereby making the recoil frequency adjustment more accurate in the subsequent process.

[0096] In one embodiment, the backwashing method further comprises:

[0097] S1: In response to the total purified water output of the water purifier being greater than or equal to a first preset threshold, the difference coefficient is adjusted so that the purified water flow difference falls within a preset range. The first preset threshold can be set according to specific usage conditions.

[0098] When the total water output of the water purifier is greater than or equal to the first preset threshold, the filtering capacity of the filter element may be reduced. Therefore, the impurities leaked from the filter element per unit time may increase, resulting in an increase in the impurities attached to the filter net.

[0099] S2: In response to the difference in the purified water flow rate falling into a preset range, adjusting the initial backwash frequency to obtain a target backwash frequency of the water purifier.

[0100] In this embodiment, when the total purified water output of the water purifier is greater than or equal to the first preset threshold, the difference coefficient is adjusted, and then the backwash frequency is adjusted, so that the filter can be cleaned more effectively to prevent the filter from being blocked.

[0101] In one embodiment, the backwashing method further comprises:

[0102] S1: In response to the usage time of the water purifier being greater than or equal to the second preset threshold, the difference coefficient is adjusted so that the difference in the purified water flow rate falls within a preset range. The second preset threshold can be set according to specific usage conditions.

[0103] When the usage time of the water purifier is greater than or equal to the second preset threshold, the filtering capacity of the filter element may be reduced. Therefore, the impurities leaked from the filter element per unit time may increase, resulting in an increase in impurities attached to the filter net.

[0104] S2: In response to the difference in the purified water flow rate falling into a preset range, adjusting the initial backwash frequency to obtain a target backwash frequency of the water purifier.

[0105] In this embodiment, when the usage time of the water purifier is greater than or equal to the second preset threshold, the difference coefficient is adjusted, and then the backwashing frequency is adjusted, so that the filter can be cleaned more effectively to prevent the filter from being blocked.

[0106] In one embodiment, the usage status information includes the usage time of the water purifier; the usage time of the water purifier is positively correlated with the target backwashing frequency.

[0107] In this embodiment, as the use time increases, the filtering capacity of the filter element may decrease, resulting in more and more impurities accumulating on the filter screen. Therefore, increasing the backwashing frequency as the water purifier is used can more effectively clean the filter screen to prevent the filter screen from being blocked.

[0108] In one embodiment, the usage status information includes water hardness; the water hardness is positively correlated with the target backwash frequency.

[0109] Among them, the water hardness in different regions is based on the TDS test value in different regions (TDS test value is an indicator to measure the total dissolved solids content in water).

[0110] In this embodiment: Since water with high hardness has more mineral deposits filtered out by the filter, which in turn causes more and more impurities to accumulate on the filter, therefore, as the water hardness of the water purifier increases, the backwashing frequency can more effectively clean the filter to prevent the filter from being blocked.

[0111] In one embodiment, Figure 4 The following is a flowchart of a backwashing method for a water purifier provided in the exemplary embodiment 1 of the present disclosure. Figure 4 Explain how the water purifier produces water and how to dynamically adjust the frequency of backwashing.

[0112] S1: Determine whether the water purifier needs to make water. If yes, proceed to S2. If no, proceed to S3;

[0113] S2: Open the solenoid valve 3 (the third solenoid valve in the above embodiment) and close the solenoid valves 1 and 2 (the first solenoid valve and the second solenoid valve in the above embodiment), and the process ends after pure water is produced.

[0114] S3: Determine whether the purified water output is greater than or equal to the first preset threshold, if necessary, proceed to S4. If not necessary, end.

[0115] It is also possible to determine whether the usage time of the water purifier is greater than or equal to a second preset threshold, wherein the first preset threshold and the second preset threshold can be set according to actual conditions.

[0116] S4: Adjust the backwash frequency.

[0117] It should be noted that here the net water flow difference is adjusted by adjusting the difference coefficient so that the net water flow difference falls within a preset range, and then the initial backwash frequency is adjusted to obtain the target backwash frequency.

[0118] The difference coefficient can be set according to specific needs. Preferably, it can be set according to the water quality in different regions. The water quality in different regions is based on the TDS test value in different regions (TDS test value is an indicator of the total solid content dissolved in water). The water hardness in different regions is generally positively correlated with the initial flushing frequency. The specific calculation formula of water hardness and initial flushing frequency can be obtained by experimental testing.

[0119] Specifically, the difference coefficient is a coefficient of a PID controller.

[0120] According to the formula: U(t)=K p *e(t)+K i *∑e(t)+K d *(e(t)-e(t-1)) is used to adjust the PID coefficient, where U(t) is the flow difference of the water purifier, K p , K i , K d is the coefficient of the PID controller, i.e., the difference coefficient. e(t) is the first difference mentioned above; e(t-1) is the second difference mentioned above.

[0121] S5: Open the solenoid valves 1 and 2 (the first solenoid valve and the second solenoid valve in the above embodiment) and close the solenoid valve 3 (the third solenoid valve in the above embodiment) to allow the incoming water flow to reversely flush the filter screen and then end.

[0122] S6: Determine whether the flow difference falls within a preset interval, if so, proceed to S7. If not, proceed to S8.

[0123] S7: Adjust the backwash frequency.

[0124] It should be noted that the backwash frequency is adjusted according to the usage of the water purifier.

[0125] S8: Open the solenoid valves 1 and 2 (the first solenoid valve and the second solenoid valve in the above embodiment) and close the solenoid valve 3 (the third solenoid valve in the above embodiment) to allow the incoming water flow to reversely flush the filter screen and then end.

[0126] In addition, during initial use, the filter element will be backwashed after flushing to prevent impurities from the first flush of the filter element structure from clogging the filter element.

[0127] Example 2

[0128] Corresponding to the aforementioned backwashing method embodiment of the water purifier, the present disclosure also provides an embodiment of a backwashing system of the water purifier. Figure 5 A schematic diagram of a module of a backwashing system provided by an exemplary embodiment of the present disclosure, the system comprising:

[0129] A determination module 51 is used to determine the difference in the purified water flow rate of the water purifier according to the change in the purified water output of the water purifier and the difference coefficient;

[0130] A response module 52, for adjusting the initial backwash frequency according to the use status information of the water purifier in response to the difference in the purified water flow rate falling into a preset range, so as to obtain a target backwash frequency of the water purifier;

[0131] The control module 53 is used to control the water purifier to perform backwashing operation on the filter based on the target backwashing frequency.

[0132] Optionally, the determination module 51 includes:

[0133] An acquisition unit is used to acquire a first clean water output before the filter is flushed for the tth time, a second clean water output after the filter is flushed for the t-1th time, a third clean water output before the filter is flushed for the t-1th time, and a fourth clean water output after the filter is flushed for the t-2th time; wherein the tth flush is the latest flush; and t is a positive integer greater than 2;

[0134] A first calculation unit, used for calculating a first difference between a first purified water output and a second purified water output and a second difference between a third purified water output and a fourth purified water output;

[0135] The second calculation unit is used to calculate the net water flow difference according to the first difference, the second difference and the difference coefficient.

[0136] Optionally, the determination module 51 determines the net water flow difference by the following calculation formula:

[0137] U(t)=K p *e(t)+K i *∑e(t)+K d *(e(t)-e(t-1));

[0138] Among them, U(t) is the net water flow difference; e(t) is the first difference; e(t-1) is the second difference; K p , K i , K d is the difference coefficient.

[0139] Optionally, the backwash system further comprises:

[0140] The acquisition module is used to obtain the preset step response curve and initial difference coefficient K' corresponding to the change of the purified water output p , K′ i , K′ d ;

[0141] Iteration module, used to iteratively adjust the initial difference coefficient K′ p , K′ i, K′ d , to adjust the net water flow difference curve corresponding to the net water flow difference U(t);

[0142] The second response module is used to respond to the net water flow difference curve being close to the preset step response curve, and use the coefficient in the net water flow difference curve as the difference coefficient K p , K i , K d Optionally, the backwash system further comprises:

[0143] A first adjustment module, configured to adjust the difference coefficient in response to the total purified water output of the water purifier being greater than or equal to a first preset threshold value, so that the purified water flow difference falls within a preset range;

[0144] A first adjustment module, configured to adjust the initial backwash frequency in response to the difference in the purified water flow rate falling within a preset range, so as to obtain a target backwash frequency of the water purifier;

[0145] and / or,

[0146] A second adjustment module, in response to the use time of the water purifier being greater than or equal to a second preset threshold, adjusts the difference coefficient so that the difference in the purified water flow rate falls within a preset range;

[0147] The second regulating module adjusts the initial backwashing frequency in response to the difference in the purified water flow rate falling into a preset range to obtain a target backwashing frequency of the water purifier.

[0148] As for the system embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The system embodiment described above is only illustrative, in which the units described as separate components may or may not be physically separated, and the components as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the disclosed solution.

[0149] Example 3

[0150] Figure 6 This is a structural schematic diagram of an electronic device shown in an example embodiment of the present disclosure, the electronic device includes a memory, a processor, and a computer program stored in the memory and used to run on the processor, and when the processor executes the computer program, the backwashing method of the water purifier described in any of the above embodiments is implemented. Figure 6 The electronic device 60 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0151] like Figure 6As shown, the electronic device 60 may be in the form of a general-purpose computing device, for example, it may be a server device. The components of the electronic device 60 may include, but are not limited to: at least one processor 61, at least one memory 62, and a bus 63 connecting different system components (including the memory 62 and the processor 61).

[0152] The bus 63 includes a data bus, an address bus, and a control bus.

[0153] The memory 62 may include a volatile memory, such as a random access memory (RAM) 621 and / or a cache memory 622 , and may further include a read-only memory (ROM) 623 .

[0154] The memory 62 may also include a program tool 625 (or utility) having a set (at least one) of program modules 624, such program modules 624 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0155] The processor 61 executes various functional applications and data processing by running the computer program stored in the memory 62, such as the backwashing method of the water purifier provided in any of the above embodiments.

[0156] The electronic device 60 may also communicate with one or more external devices 64 (e.g., keyboards, pointing devices, etc.). Such communication may be performed via an input / output (I / O) interface 65. Furthermore, the electronic device 60 may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter 66. As shown, the network adapter 66 communicates with other modules of the electronic device 60 via a bus 63. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 60, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems, etc.

[0157] It should be noted that although several units / modules or sub-units / modules of the electronic device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided into multiple units / modules to be embodied.

[0158] Example 4

[0159] The embodiments of the present disclosure further provide a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the backwashing method of the water purifier provided in any of the above embodiments is implemented.

[0160] The readable storage medium may include but is not limited to: a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device or any suitable combination of the above.

[0161] Example 5

[0162] The present disclosure also provides a computer program product, including a computer program, which, when executed by a processor, implements any of the above-mentioned backwashing methods for a water purifier.

[0163] Among them, the program code for executing the computer program product of the present disclosure can be written in any combination of one or more programming languages, and the program code can be executed completely on the user device, partially on the user device, as an independent software package, partially on the user device and partially on a remote device, or completely on the remote device.

[0164] Although the specific embodiments of the present disclosure are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present disclosure is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present disclosure, but these changes and modifications all fall within the protection scope of the present disclosure.

Claims

1. A backwashing method for a water purifier, characterized in that: The water purifier includes a filter screen, and the backwashing method includes: Determining the difference in the purified water flow rate of the water purifier according to the change in the purified water output of the water purifier and the difference coefficient; In response to the difference in the purified water flow rate falling within a preset range, adjusting the initial backwash frequency according to the usage status information of the water purifier to obtain a target backwash frequency of the water purifier; The water purifier is controlled to perform a backwash operation on the filter based on the target backwash frequency.

2. The backwashing method according to claim 1, characterized in that: The step of determining the difference in the purified water flow rate of the water purifier according to the change in the purified water output of the water purifier and the difference coefficient comprises: Obtain the first clean water output before flushing the filter for the tth time, the second clean water output after flushing the filter for the t-1th time, the third clean water output before flushing the filter for the t-1th time, and the fourth clean water output after flushing the filter for the t-2th time; wherein the tth flushing is the latest flushing; t is a positive integer greater than 2; Calculating a first difference between the first purified water output and the second purified water output and a second difference between the third purified water output and the fourth purified water output; The net water flow difference is calculated according to the first difference, the second difference and the difference coefficient.

3. The backwashing method according to claim 2, characterized in that: The calculation formula of the net water flow difference is as follows: U(t)=K p *e(t)+K i *∑e(t)+K d *(e(t)-e(t-1)); Wherein, U(t) is the net water flow difference; e(t) is the first difference; e(t-1) is the second difference; K p , K i , K d is the difference coefficient.

4. The backwashing method according to claim 3, characterized in that: The step of determining the difference of the purified water flow rate of the water purifier according to the change of the purified water output of the water purifier and the difference coefficient comprises: Obtain the preset step response curve and initial difference coefficient K′ corresponding to the change in the purified water output p , K′ i , K′ d ; Iteratively adjust the initial difference coefficient K′ p , K′ i , K′ d ; To adjust the net water flow difference curve corresponding to the net water flow difference U(t); In response to the net water flow difference curve being infinitely close to the preset step response curve, the coefficient in the net water flow difference curve is used as the difference coefficient K p , K i , K d ; The difference coefficient is adjusted according to the change characteristics of the step response curve to determine the net water flow difference.

5. The backwashing method according to claim 1, characterized in that: The backwashing method further comprises: In response to the total purified water output of the water purifier being greater than or equal to a first preset threshold, adjusting the difference coefficient so that the purified water flow difference falls within a preset range; In response to the difference in the purified water flow rate falling within a preset range, adjusting the initial backwash frequency to obtain a target backwash frequency of the water purifier; and / or, In response to the usage time of the water purifier being greater than or equal to a second preset threshold, adjusting the difference coefficient so that the difference in the purified water flow rate falls within a preset range; In response to the difference in the purified water flow rate falling within a preset range, the initial backwash frequency is adjusted to obtain a target backwash frequency of the water purifier.

6. The backwashing method according to claim 1, characterized in that: The usage status information includes the usage time of the water purifier; the usage time of the water purifier is positively correlated with the target backwashing frequency; and / or; The usage status information includes water hardness; the water hardness is positively correlated with the target backwash frequency.

7. A backwash system for a water purifier, characterized in that: The water purifier includes a filter screen; the backwashing system is used to perform the backwashing method according to any one of claims 1 to 6; the backwashing system includes: A determination module, used to determine the difference in purified water flow of the water purifier according to the change in purified water output of the water purifier and the difference coefficient; A response module, configured to adjust the initial backwash frequency according to the use status information of the water purifier in response to the difference in the purified water flow rate falling into a preset range, so as to obtain a target backwash frequency of the water purifier; A control module is used to control the water purifier to perform a backwash operation on the filter based on the target backwash frequency.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and used to run on the processor, characterized in that: When the processor executes the computer program, the backwashing method according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the backwashing method according to any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the backwashing method according to any one of claims 1 to 6 is implemented.

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