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

Abstract

The present disclosure provides a backwashing method, system, electronic device, storage medium and program product of a water purifier. The water purifier comprises a filter screen, and the backwashing method comprises: determining a water purification flow difference of the water purifier according to a water purification outflow change condition and a difference coefficient of the water purifier; in response to the water purification flow difference falling within a preset range, adjusting an initial backwashing frequency according to use state information of the water purifier to obtain a target backwashing frequency of the water purifier; and controlling the water purifier to perform a backwashing operation on the filter screen based on the target backwashing frequency. In this way, not only the water purification outflow change condition of the water purifier is used, but also the use state information of the water purifier is used to dynamically adjust the backwashing frequency of the water purifier, so that the problem that a too high backwashing frequency wastes water resources and a too low backwashing frequency leads to poor washing effect of impurities adsorbed on the filter screen can be effectively avoided. Furthermore, the use experience of a user can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of household appliances, in particular to a backwashing method and system of a water purifier, an electronic device, a storage medium and a program product. BACKGROUND

[0002] A filter screen is usually arranged at the water outlet end of the filter element of a water purifier to prevent impurities from leaking out of the filter element. However, the filter screen may be clogged after a long time of use. In order to solve the problem of filter screen clogging, the water purifier performs backwashing on the filter screen to remove the impurities adsorbed on the filter screen. However, the current backwashing method has a fixed backwashing frequency for the filter screen. 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 screen will not be effectively washed out. Therefore, the backwashing method of the water purifier still needs to be improved. SUMMARY

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

[0004] The present application solves the above technical problems by the following technical solutions:

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

[0006] determining a water flow difference of the water purifier according to a water flow variation of the water purifier and a difference coefficient;

[0007] in response to the water flow difference falling within a preset range, adjusting an initial backwashing frequency according to usage state information of the water purifier to obtain a target backwashing frequency of the water purifier;

[0008] controlling the water purifier to perform a backwashing operation on the filter screen based on the target backwashing frequency.

[0009] Optionally, the determining of the water flow difference of the water purifier according to the water flow variation of the water purifier and the difference coefficient comprises:

[0010] obtaining a first water flow, a second water flow, a third water flow and a fourth water flow; wherein the first water flow is a water flow before the tth backwashing, the second water flow is a water flow after the (t-1)th backwashing, the third water flow is a water flow before the (t-1)th backwashing, and the fourth water flow is a water flow after the (t-2)th backwashing; wherein the tth backwashing is the latest backwashing, and t is a positive integer greater than 2;

[0011] calculating a first difference value of the first purified water output and the second purified water output and a second difference value of the third purified water output and the fourth purified water output;

[0012] According to the first difference value, the second difference value and the difference coefficient, the purified water flow difference value is calculated.

[0013] Optionally, the calculation formula of the purified water flow difference value 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 purified water flow difference value; e(t) is the first difference value; e(t-1) is the second difference value; K p , K i , K d is the difference coefficient.

[0016] Optionally, before the step of determining the purified water flow difference value of the water purifier according to the purified water output change of the water purifier and the difference coefficient, the method comprises:

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

[0018] Iteratively adjusting the initial difference coefficients K′ p , K′ i , K′ d ; to adjust the purified water flow difference value curve corresponding to the purified water flow difference value U(e);

[0019] In response to the purified water flow difference value curve approaching the preset step response curve, the coefficients in the purified water flow difference value curve are taken as the difference coefficients 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, the difference coefficient is adjusted so that the purified water flow difference value falls within a preset range;

[0022] In response to the purified water flow difference value falling within the preset range, the initial backwashing frequency is adjusted to obtain the target backwashing frequency of the water purifier;

[0023] and / or,

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

[0025] in response to the water flow difference falling within the preset range, adjusting an initial backwashing frequency to obtain a target backwashing frequency of the water purifier.

[0026] Optionally, the use state information includes a water purifier use duration; the water purifier use duration is positively correlated with the target backwashing frequency.

[0027] and / or;

[0028] The use state information includes water hardness; the water hardness is positively correlated with the target backwashing frequency.

[0029] In a second aspect, a backwashing system of a water purifier is provided, the water purifier including a filter screen; the backwashing system is configured to perform any of the backwashing methods described above; and the backwashing system includes:

[0030] A determination module is configured to determine a water flow difference of the water purifier according to a water output change of the water purifier and a difference coefficient.

[0031] A response module is configured to, in response to the water flow difference falling within a preset range, adjust an initial backwashing frequency according to use state information of the water purifier to obtain a target backwashing frequency of the water purifier.

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

[0033] Optionally, the determination module includes:

[0034] An acquisition unit is configured to acquire a first water output before tth backwashing of the filter screen, a second water output after (t-1)th backwashing of the filter screen, a third water output before (t-1)th backwashing of the filter screen, and a fourth water output after (t-2)th backwashing of the filter screen; wherein the tth backwashing is the latest backwashing; t is a positive integer greater than 2.

[0035] A first calculation unit is configured to calculate a first difference between the first water output and the second water output and a second difference between the third water output and the fourth water output.

[0036] A second calculation unit is configured to calculate the water flow difference according to the first difference, the second difference, and the difference coefficient.

[0037] Optionally, the determining module determines the purified water flow difference value through 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 purified water flow difference value; e(t) is the first difference value; e(t-1) is the second difference value; K p , K i , K d is the difference coefficient.

[0040] Optionally, the backwashing system further comprises:

[0041] The acquisition module is configured to acquire a preset step response curve corresponding to the purified water output change and an initial difference coefficient K' p , K' i , K' d .

[0042] The iteration module is configured to iteratively adjust the initial difference coefficient K' p , K' i , K' d to adjust a purified water flow difference value curve corresponding to the purified water flow difference value U(t).

[0043] The second response module is configured to, in response to the purified water flow difference value curve being infinitely close to the preset step response curve, take a coefficient in the purified water flow difference value curve as the difference coefficient K p , K i , K d .

[0044] The second acquisition unit is configured to acquire a step response curve corresponding to the purified water output change.

[0045] The determining unit is configured to adjust the difference coefficient according to a change characteristic of the step response curve to determine the purified water flow difference value.

[0046] Optionally, the backwashing system further comprises:

[0047] The first adjustment module is configured to, in response to the total purified water output of the purified water machine being greater than or equal to a first preset threshold, adjust the difference coefficient to determine the purified water flow difference value.

[0048] The first adjusting module is configured to adjust an initial backwashing frequency to obtain a target backwashing frequency of the water purifier in response to the water flow difference falling within a preset range.

[0049] and / or,

[0050] The second adjusting module is configured to adjust the difference coefficient to determine the water flow difference in response to the usage duration of the water purifier being greater than or equal to a second preset threshold.

[0051] The second adjusting module is configured to adjust an initial backwashing frequency to obtain a target backwashing frequency of the water purifier in response to the water flow difference falling within a preset range.

[0052] In a third aspect, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and configured to run on the processor, wherein the processor implements the backwashing method of any one of the preceding aspects when executing the computer program.

[0053] In a fourth aspect, a computer readable storage medium is provided, which stores a computer program, wherein the computer program is executed by a processor to implement the backwashing method of any one of the preceding aspects.

[0054] In a fifth aspect, a computer program product is provided, including a computer program, wherein the computer program is executed by a processor to implement the backwashing method of any one of the preceding aspects.

[0055] On the basis of common sense in the art, the above-mentioned preferred conditions can be combined arbitrarily, i.e., to obtain each preferred example of the present disclosure.

[0056] The positive progress effect of the present disclosure is that the present disclosure not only adjusts the backwashing frequency of the water purifier according to the change of the water purifier water output, but also according to the usage state information of the water purifier, which can effectively avoid the problem that the backwashing frequency is too high to waste water resources, and the backwashing frequency is too low to cause poor flushing effect of the impurities adsorbed on the filter screen. Further, the use experience of the user can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0057] Figure 1 A water purifier water path schematic diagram in a backwashing method of a water purifier according to an exemplary embodiment 1 of the present disclosure is provided;

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

[0059] Figure 3 A flowchart of a backwashing method of a water purifier according to an exemplary embodiment 1 of the present disclosure is provided;

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

[0061] Figure 5 A module schematic diagram of a backwashing system of a water purifier provided for exemplary embodiment 2 of the present disclosure.

[0062] Figure 6 A structural schematic diagram of an electronic device shown for exemplary embodiment 3 of the present disclosure. DETAILED DESCRIPTION

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

[0064] The prefix words such as "first", "second" in the embodiments of the present disclosure are merely used 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 ordinal words such as ordinal words in the embodiments of the present disclosure does not constitute a limitation on the described objects, and the description of the described objects should be seen in the context of the embodiments, and should not constitute an unnecessary limitation because of the use of such prefix words. In addition, in the description of the embodiments, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0065] Embodiment 1

[0066] Figure 1 A water purifier waterway schematic diagram of a backwashing method of a water purifier provided for exemplary embodiment 1 of the present disclosure, in combination with Figure 1 , the working principle of the water purifier is explained.

[0067] When the water purifier needs to backwash the filter screen, the controller (not shown in Figure 3 ) controls the first electromagnetic valve 317 and the second electromagnetic valve 314 to open and the third electromagnetic valve 315 to close, 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 electromagnetic valve 317, the backwashing 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, to wash the filter screen, and then the water flow with impurities is sent to the water purifier wastewater outlet 313 through the backwashing water outlet of the filter assembly 318, the second one-way valve 323 and the second electromagnetic valve 314 in sequence.

[0068] When the water purifier needs to flow out purified water, the controller Figure 3The controller (not shown) controls the first electromagnetic valve 317 and the second electromagnetic valve 314 to be closed and controls the third electromagnetic valve 315 and the water valve assembly 319 to be opened, so that the water flow entering from the water inlet 311 is filtered by the filter element 312, the third electromagnetic valve 315, the clean water inlet of the filter assembly 318, the pressurizing 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 clean water outlet 322 through the clean water outlet 322 of the filter assembly 318, the water valve assembly 319, the flow meter 320, and the direct current pump 321 in sequence. It should be noted that the water valve assembly 319 is used to stabilize the water pressure of the clean water flow, and the controller controls the opening and closing of the water valve in the water valve assembly 319 to control the on-off of the clean water flow; the flow meter 320 is used to count the water production of the water flow; and the direct current pump 321 is used to provide water pressure to ensure water outlet.

[0069] The structure of the filter assembly 318 is shown in FIG. 4. The backflush inlet (not shown) and the backflush outlet (not shown) are arranged on the wall surface of the filter pipeline; the backflush inlet is in communication with the clean water inlet of the water purifier; the backflush outlet is in communication with the waste water outlet of the water purifier; the filter screen and the pressurizing ring are arranged in the filter pipeline between the backflush outlet and the backflush inlet in sequence; and the maximum outer diameter of the pressurizing ring is less than or equal to the inner diameter of the filter pipeline. Figure 2 When the filter screen is cleaned, the water flow entering from the backflush inlet will flush the pressurizing ring to the side of the filter screen. Since the inner diameter of the pressurizing ring is less than the inner diameter of the filter pipeline, the water flow pressure through the filter screen will be increased after passing through the pressurizing ring, so that the filter screen can be more effectively cleaned. The water flow carrying impurities after backflushing flows from the backflush outlet to the waste water outlet of the water purifier. It should be noted that, in order to avoid the clean water of the water purifier being contaminated by the impurities in the water flow after backflushing, the backflushing process of the filter screen is performed when the water purifier is not used by the user. In addition, the movement range of the pressurizing ring is limited by the limiting groove, so that the pressurizing ring can only move between the filter screen end and the limiting groove, thereby avoiding excessive movement of the pressurizing ring in the filter pipeline. In this way, the pressurizing effect of the pressurizing ring on the water flow can be enhanced, and the abrasion of other parts of the filter assembly can be avoided. In addition, the limiting groove can enable the pressurizing ring to work at the best position, thereby improving the stability and reliability of the entire filter assembly.

[0070] In order to dynamically adjust the backflushing frequency of the water purifier, the embodiment 1 of the present application provides a backflushing method of a water purifier.

[0071] The backflushing method of the water purifier provided by the exemplary embodiment 1 of the present application includes the following steps: Figure 3

[0072] ​Step 101, determining the water purification flow difference of the water purifier according to the water purification outflow change of the water purifier and the difference coefficient.

[0073] Step 102, in response to the water purification flow difference falling 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.

[0074] The preset range is a section interval in the normal distribution of the water purification flow difference. If the water purification flow difference falls into the interval, the initial backwashing frequency is adjusted according to the use state information of the water purifier, and if it does not fall into the interval, the next step is not performed.

[0075] Step 103, controlling the water purifier to perform backwashing operation on the filter screen based on the target backwashing frequency.

[0076] In the embodiment, not only the water purification outflow change of the water purifier, but also the use state information of the water purifier is used to dynamically adjust the backwashing frequency of the water purifier, which can effectively avoid the problem that the backwashing frequency is too high to waste water resources, and the backwashing frequency is too low to cause poor washing effect of the impurities adsorbed on the filter screen. Further, the use experience of the user can be improved.

[0077] In one embodiment, the water purification flow difference of the water purifier is determined according to the water purification outflow change of the water purifier and the difference coefficient, comprising:

[0078] S1: obtaining the first water purification outflow before the tth washing of the filter screen, the second water purification outflow after the (t-1)th washing of the filter screen, the third water purification outflow before the (t-1)th washing of the filter screen, and the fourth water purification outflow after the (t-2)th washing of the filter screen; wherein the tth washing is the latest washing; t is a positive integer greater than 2;

[0079] S2: calculating the first difference between the first water purification outflow and the second water purification outflow, and the second difference between the third water purification outflow and the fourth water purification outflow;

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

[0081] The first difference and the second difference provide the water purification outflow difference after two consecutive backwashes, which can reflect the filter core state and the filtering effect of the water purifier. For example, if the two differences are large, the filtering effect of the filter core may be reduced, which will cause more impurities to leak from the filter core, and then the impurities on the filter screen will also increase.

[0082] In the embodiment, the first difference and the second difference can not only more accurately calculate the water purification flow difference, but also reflect the filter core state and the filtering effect of the water purifier, so as to better adjust the backwashing frequency.

[0083] In one embodiment, the formula for calculating 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] 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 , and K d are difference coefficients.

[0086] Preferably, the above formula can be executed by a positional PID controller, and K p , K i , and K d are respectively set as PID coefficients.

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

[0088] In one embodiment, the difference coefficients are adjusted according to the variation characteristics of the step response curve corresponding to the variation of the net water output, so as to determine the interpolation coefficients.

[0089] In one embodiment, according to the variation of the net water output of the water purifier and the difference coefficients, the step of determining the net water flow difference of the water purifier comprises the following steps before the step of determining the net water flow difference of the water purifier:

[0090] S1: obtaining a preset step response curve corresponding to the variation of the net water output and an initial difference coefficient K' p ′ , K' i ', and K' d .

[0091] It should be noted that, in addition to the step response curve, other curves reflecting the variation of the net water output can also be used.

[0092] S2: iteratively adjusting the initial difference coefficient K' p , K' i , and K' d ; so as 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, setting the coefficients in the net water flow difference curve as the difference coefficients K p , K i , and K d .

[0094] The net water flow difference value curve is close to the preset step response curve means that the similarity between the net water flow difference value curve and the preset step response curve is greater than a 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 value, and then the subsequent adjustment of the backwashing frequency is more accurate.

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

[0097] S1: in response to the total net water output of the water purifier being greater than or equal to a first preset threshold, adjusting the difference coefficient so that the net water flow difference value falls within a preset range. The first preset threshold can be set according to specific use conditions.

[0098] When the total net water output of the water purifier is greater than or equal to the first preset threshold, the filtering capacity of the filter element may decrease, so that the impurities leaked by the filter element in unit time may increase, resulting in an increase in the impurities attached to the filter screen.

[0099] S2: in response to the net water flow difference value falling within the preset range, adjusting the initial backwashing frequency to obtain the target backwashing frequency of the water purifier.

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

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

[0102] S1: in response to the use duration of the water purifier being greater than or equal to a second preset threshold, adjusting the difference coefficient so that the net water flow difference value falls within a preset range. The second preset threshold can be set according to specific use conditions.

[0103] When the use duration of the water purifier is greater than or equal to the second preset threshold, the filtering capacity of the filter element may decrease, so that the impurities leaked by the filter element in unit time may increase, resulting in an increase in the impurities attached to the filter screen.

[0104] S2: in response to the net water flow difference value falling within the preset range, adjusting the initial backwashing frequency to obtain the target backwashing frequency of the water purifier.

[0105] In this embodiment, when the use duration 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 screen can be cleaned more effectively to prevent the filter screen from being blocked.

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

[0107] In this embodiment, as the usage duration of the water purifier increases, the filtering capacity of the filter element may decrease, and thus more and more impurities may accumulate on the filter screen. Therefore, as the water quality hardness increases, the backwashing frequency can more effectively clean the filter screen to prevent the filter screen from being blocked.

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

[0109] In this embodiment, the water quality hardness in different regions is determined according to the TDS detection value (TDS detection value is an index for measuring the total solid content dissolved in water) in different regions.

[0110] In this embodiment, as the water quality hardness increases, the backwashing frequency can more effectively clean the filter screen to prevent the filter screen from being blocked.

[0111] In one embodiment, Figure 4 A working flow chart of a backwashing method of a water purifier is provided for the exemplary embodiment 1 of the present disclosure. The working flow chart is combined with the above-mentioned embodiments to illustrate how the water purifier produces water and how the backwashing frequency is dynamically adjusted. Figure 4 The working flow chart illustrates how the water purifier produces water and how the backwashing frequency is dynamically adjusted.

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

[0113] S2: Open the electromagnetic valve 3 (the third electromagnetic valve in the above-mentioned embodiment) and close the electromagnetic valves 1 and 2 (the first electromagnetic valve and the second electromagnetic valve in the above-mentioned embodiment), and end after producing pure water.

[0114] S3: Determine whether the water purifier water output is greater than or equal to a first preset threshold value. If yes, proceed to S4. If no, end.

[0115] The usage duration of the water purifier can also be determined by determining whether the usage duration of the water purifier is greater than or equal to a second preset threshold value, wherein the first preset threshold value and the second preset threshold value can be set according to actual conditions.

[0116] S4: Adjust the backwashing frequency.

[0117] It should be noted that the water purifier flow difference is adjusted by adjusting the difference coefficient, so that the water purifier flow difference falls within the preset interval, and then the initial backwashing frequency is adjusted to obtain the target backwashing frequency.

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

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

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

[0121] S5: open electromagnetic valves 1 and 2 (first electromagnetic valve and second electromagnetic valve in the above embodiment) and close electromagnetic valve 3 (third electromagnetic valve in the above embodiment), and end after reversing the water flow to backwash the filter screen.

[0122] S6: determine whether the flow difference falls into the preset interval, if it falls into, proceed to S7. If it does not fall into, execute S8.

[0123] S7: adjust the backwashing frequency.

[0124] It should be noted that the backwashing frequency is adjusted through the use of the water purifier.

[0125] S8: open electromagnetic valves 1 and 2 (first electromagnetic valve and second electromagnetic valve in the above embodiment) and close electromagnetic valve 3 (third electromagnetic valve in the above embodiment), and end after reversing the water flow to backwash the filter screen.

[0126] In addition, after the filter core flushing is completed at the initial use, the filter screen will be backwashed to prevent the impurities from the first flushing of the filter core structure from being blocked to the filter screen.

[0127] Embodiment 2

[0128] Corresponding to the backwashing method embodiment of the water purifier described above, the disclosure also provides an embodiment of a backwashing system of a water purifier. Figure 5 A module schematic diagram of a backwashing system is provided for an exemplary embodiment of the disclosure, and the system comprises:

[0129] The determining module 51 is configured to determine a water purification flow difference of the water purifier according to the water purification outflow change and the difference coefficient.

[0130] The response module 52 is configured to, in response to the water purification flow difference falling within a preset range, adjust an initial backwashing frequency according to the use state information of the water purifier to obtain a target backwashing frequency of the water purifier.

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

[0132] Optionally, the determining module 51 comprises:

[0133] The acquisition unit is configured to acquire a first water purification outflow before the tth time of purifying the filter screen, a second water purification outflow after the (t-1)th time of purifying the filter screen, a third water purification outflow before the (t-1)th time of purifying the filter screen, and a fourth water purification outflow after the (t-2)th time of purifying the filter screen, wherein the tth time of purifying is the latest time of purifying, and t is a positive integer greater than 2.

[0134] The first calculation unit is configured to calculate a first difference between the first water purification outflow and the second water purification outflow and a second difference between the third water purification outflow and the fourth water purification outflow.

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

[0136] Optionally, the determining module 51 determines the water purification flow difference through the following calculation formula:

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

[0138] wherein U(t) is the water purification flow difference, e(t) is the first difference, e(t-1) is the second difference, K p , K i , and K d are the difference coefficient.

[0139] Optionally, the backwashing system further comprises:

[0140] The acquisition module is configured to acquire a preset step response curve corresponding to the water purification outflow change and an initial difference coefficient K' p , K' i , and K' d .

[0141] The iteration module is configured to iteratively adjust the initial difference coefficient K' p , K' iK d to adjust the net water flow difference value curve corresponding to the net water flow difference value U(t);

[0142] The second response module is configured to, in response to the net water flow difference value curve being close to the preset step response curve, take a coefficient in the net water flow difference value curve as a difference coefficient K p K i K d Optionally, the backwashing system further comprises:

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

[0144] The first adjustment module is configured to, in response to the total net water output of the water purifier being greater than or equal to a first preset threshold, adjust the difference coefficient so that the net water flow difference value falls within a preset range.

[0145] and / or,

[0146] The second adjustment module is configured to, in response to the use duration of the water purifier being greater than or equal to a second preset threshold, adjust the difference coefficient so that the net water flow difference value falls within a preset range.

[0147] The second adjustment module is configured to, in response to the use duration of the water purifier being greater than or equal to a second preset threshold, adjust the difference coefficient so that the net water flow difference value falls within a preset range.

[0148] For the system embodiment, since it basically corresponds to the method embodiment, the related parts can be referred to the part of the method embodiment. The system embodiment described above is only illustrative, and the units described as separate components can or can not be physically separated, and the components of the unit can or can not be physical units, i.e. they can be located in one place or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the present disclosure.

[0149] Embodiment 3

[0150] Figure 6 A structural schematic diagram of an electronic device according to an example embodiment of the present disclosure is shown, which includes a memory, a processor, and a computer program stored in the memory and used to run on the processor, and the processor implements the backwashing method of the water purifier according to any of the above embodiments when executing the computer program. Figure 6 The electronic device 60 shown is only an example, and should not limit the functions and use range of the embodiments of the present disclosure.

[0151] As Figure 6As shown, the electronic device 60 can be in the form of a general computing device, for example, it can be a server device. The components of the electronic device 60 can include, but are not limited to, the at least one processor 61 described above, the at least one memory 62 described above, and a bus 63 that connects the 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 can include volatile memory, such as random access memory (RAM) 621 and / or cache memory 622, and can further include non-volatile memory, such as read-only memory (ROM) 623.

[0154] The memory 62 can also include a program tool 625 (or utility tool) having a set (at least one) program modules 624, such as an operating system, one or more application programs, other program modules, and program data, and each of these examples, or some combination thereof, can include implementation of a network environment.

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

[0156] The electronic device 60 can also communicate with one or more external devices 64 (such as a keyboard, a pointing device, etc.) via an input / output (I / O) interface 65. Furthermore, the electronic device 60 can communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 66. As depicted, the network adapter 66 communicates with the other modules of the electronic device 60 via the bus 63. It should be appreciated that other hardware and / or software modules can be used in conjunction with the electronic device 60, including but not limited to, microcode, device drivers, redundant processing units, external disk drive arrays, RAID (Redundant Array of Independent Disks) systems, tape drives, and data backup storage systems, etc., although not shown in the figure.

[0157] It should be noted that although several units / modules or sub-units / modules of the electronic device are mentioned in the foregoing detailed description, such 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.

[0158] Embodiment 4

[0159] The embodiment of the present disclosure further provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the backwashing method of the water purifier provided by any of the above embodiments.

[0160] More specifically, the readable storage medium can include, but is not limited to, a portable disc, 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] Embodiment 5

[0162] The embodiment of the present disclosure further provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to implement the backwashing method of the water purifier provided by any of the above embodiments.

[0163] 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 can be executed completely on a user device, partially on a user device, as a separate software package, partially on a user device and partially on a remote device, or completely on a 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 illustration, and the protection scope of the present disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present disclosure, and these changes and modifications all fall within the protection scope of the present disclosure.

Claims

1. A backwashing method of a water purifier, characterized by, The water purifier comprises a filter screen, and the backwashing method comprises: According to the change of the water purifying water yield of the water purifier and the difference coefficient, the water purifying flow difference of the water purifier is determined; In response to the water purifying flow difference falling within a preset range, the initial backwashing frequency is adjusted according to the use state information of the water purifier to obtain the target backwashing frequency of the water purifier; The water purifier is controlled to perform backwashing operation on the filter screen based on the target backwashing frequency; The water purifying flow difference of the water purifier is determined according to the change of the water purifying water yield of the water purifier and the difference coefficient, which comprises: The first water purifying water yield before the tth backwashing of the filter screen, the second water purifying water yield after the (t-1)th backwashing of the filter screen, the third water purifying water yield before the (t-1)th backwashing of the filter screen, and the fourth water purifying water yield after the (t-2)th backwashing of the filter screen are obtained; wherein the tth backwashing is the latest backwashing; t is a positive integer greater than 2; The first difference between the first water purifying water yield and the second water purifying water yield and the second difference between the third water purifying water yield and the fourth water purifying water yield are calculated; The water purifying flow difference is calculated according to the first difference, the second difference and the difference coefficient; The calculation formula of the water purifying flow difference is as follows: ； wherein, is the clean water flow difference value; is the first difference value; is the second difference value; , , is the difference coefficient.

2. The backwash method of claim 1, wherein, Before the step of determining the water purifying flow difference of the water purifier according to the change of the water purifying water yield of the water purifier and the difference coefficient, the difference coefficient is adjusted according to the change characteristics of the step response curve to determine the water purifying flow difference. Obtain the preset step response curve and initial difference coefficient corresponding to the change of the water output of the water purifier , , ; iteratively adjusting the initial difference coefficients , , ; to adjust the net water flow difference corresponding net water flow difference curve; in response to the net water flow difference curve approaching the preset step response curve, taking a coefficient in the net water flow difference curve as the difference coefficient 、 、 ; The backwashing method further comprises:

3. The backwash method of claim 1 wherein, In response to the total water purifying water yield of the water purifier being greater than or equal to a first preset threshold, the difference coefficient is adjusted to make the water purifying flow difference fall within a preset range; In response to the water purifying flow difference falling within a preset range, the initial backwashing frequency is adjusted to obtain the target backwashing frequency of the water purifier; And / or, In response to the use time length of the water purifier being greater than or equal to a second preset threshold, the difference coefficient is adjusted to make the water purifying flow difference fall within a preset range; In response to the water purifying flow difference falling within a preset range, the initial backwashing frequency is adjusted to obtain the target backwashing frequency of the water purifier. The use state information comprises the use time length of the water purifier; the use time length of the water purifier is positively correlated with the target backwashing frequency; 4. The backwash method of claim 1 wherein, And / or; The use state information comprises water hardness; the water hardness is positively correlated with the target backwashing frequency. The water purifier comprises a filter screen; the backwashing system is used to perform the backwashing method of any one of claims 1 to 4; the backwashing system comprises:

5. A backwashing system for a water purifier, characterized in that, A determination module is configured to determine the water purifying flow difference of the water purifier according to the change of the water purifying water yield of the water purifier and the difference coefficient; A response module is configured to adjust the initial backwashing frequency according to the use state information of the water purifier to obtain the target backwashing frequency of the water purifier in response to the water purifying flow difference falling within a preset range; A control module is configured to control the water purifier to perform backwashing operation on the filter screen based on the target backwashing frequency. ​ 6. An electronic device comprising a memory, a processor, and a computer program stored on the memory and configured to run on the processor, characterized in that, The computer program, when executed by the processor, implements the backflushing method of any one of claims 1 to 4.

7. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by the processor, implements the backflushing method of any one of claims 1 to 4.

8. A computer program product comprising a computer program, characterized in that, The computer program, when executed by the processor, implements the backflushing method of any one of claims 1 to 4.

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