CN115490345A - Control method for water purifier and water purifier - Google Patents

Control method for water purifier and water purifier Download PDF

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Publication number
CN115490345A
CN115490345A CN202210767864.0A CN202210767864A CN115490345A CN 115490345 A CN115490345 A CN 115490345A CN 202210767864 A CN202210767864 A CN 202210767864A CN 115490345 A CN115490345 A CN 115490345A
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China
Prior art keywords
water
tds value
target
opening degree
value
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CN202210767864.0A
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Chinese (zh)
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CN115490345B (en
Inventor
刘宁
薛瑞华
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Qingdao Haier Strauss Water Equipment Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Strauss Water Equipment Co Ltd
Haier Smart Home Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D11/00—Control of flow ratio
    • G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
    • G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
    • G05D11/139—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring a value related to the quantity of the individual components and sensing at least one property of the mixture
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Flow Control (AREA)

Abstract

The invention relates to the technical field of water purification equipment, and particularly provides a control method for a water purifier and the water purifier, aiming at solving the problem that the existing water purifier cannot adjust the TDS value of filtered pure water and influences the use experience of a user. Therefore, the water proportion regulating valve comprises a first water inlet, a second water inlet and a water outlet, wherein two ends of a first water channel are respectively communicated with the water outlet end of a reverse osmosis membrane water purification filter element and the first water inlet, and two ends of a second water channel are respectively communicated with the water outlet end of a front-mounted filter element and the second water inlet, and the control method comprises the following steps: acquiring a current TDS value of a water outlet; acquiring a target TDS value; and selectively adjusting the opening degree of the water proportion adjusting valve according to the current TDS value and the target TDS value. According to the invention, the opening of the water proportion regulating valve can be selectively regulated according to the current TDS value and the target TDS value to regulate the water inflow of the first water path and the second water path, so that the TDS value of the water outlet can be conveniently regulated, and the use experience of a user is improved.

Description

Control method for water purifier and water purifier
Technical Field
The invention relates to the technical field of water purification equipment, and particularly provides a control method for a water purifier and the water purifier.
Background
With the continuous development of the water purification industry, the appearances of water purifiers are various, but the water purifiers are mainly used for obtaining healthy and clean drinking water. The pure water TDS value of the RO water purifier on the market after purification by the RO membrane has the largest relationship with the RO membrane, that is, the TDS value of the pure water flowing out of the purifier can only be the TDS value of the pure water after purification by the RO membrane.
The TDS value of the pure water that current water purifier flows out after RO membrane purification can't be adjusted according to user's demand, leads to the user to obtain the pure water of single TDS value only, influences user's use and experiences.
Therefore, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
The invention aims to solve the technical problem that the TDS value of the filtered pure water cannot be adjusted by the conventional water purifier, so that the use experience of a user is influenced.
In a first aspect, the present invention provides a control method for a water purifier, the water purifier includes a pre-filter cartridge, a reverse osmosis membrane water purification cartridge, a first water path, a second water path, a water proportion regulating valve and a water outlet path, a water outlet end of the pre-filter cartridge is communicated with a water inlet end of the reverse osmosis membrane water purification cartridge, the water proportion regulating valve has a first water inlet, a second water inlet and a water outlet, one end of the first water path is communicated with the water outlet end of the reverse osmosis membrane water purification cartridge, the other end of the first water path is communicated with the first water inlet, one end of the second water path is communicated with the water outlet end of the pre-filter cartridge, the other end of the second water path is communicated with the second water inlet, the water outlet path is communicated with the water outlet, a water inlet amount of the first water inlet decreases with an increase of an opening degree of the water proportion regulating valve, and a water inlet amount of the second water inlet increases with an increase of an opening degree of the water proportion regulating valve, the control method includes: acquiring a current TDS value E1 of the water outlet; acquiring a target TDS value E0; and selectively adjusting the opening degree of the water proportion adjusting valve according to the current TDS value E1 and the target TDS value E0.
In a preferred technical solution of the above control method, "selectively adjusting the opening degree of the water proportional regulating valve according to the current TDS value E1 and the target TDS value E0" includes: judging whether the current TDS value E1 is equal to the target TDS value E0 or not; if the judgment result is 'yes', the opening degree of the water proportion regulating valve is not regulated; and if the judgment result is 'no', adjusting the opening of the water proportion adjusting valve.
In a preferred embodiment of the above control method, the step of "adjusting the opening degree of the water ratio adjusting valve" includes: calculating a first difference Δ 1= | E0-E1|; comparing the first difference Δ 1 with a first preset value A1; selecting a corresponding preset adjusting mode to adjust the opening of the water proportion adjusting valve according to the comparison result; wherein A1 is greater than 0.
In a preferred embodiment of the above control method, the step of selecting a corresponding preset adjustment mode to adjust the opening of the water ratio adjustment valve according to the comparison result includes: if delta 1 is larger than A1, calculating a first target opening D according to the current TDS value E1 and the target TDS value E0 1 (ii) a Adjusting the opening degree of the water proportion adjusting valve to the first target opening degree D 1 。
In a preferred technical solution of the above control method, "calculating a first target opening D according to the current TDS value E1 and the target TDS value E0 1 The method comprises the following specific steps: obtaining the current opening D of the water proportion regulating valve t (ii) a Calculating a first demand manipulated variable DeltaD 1 = k1 × (E0-E1); calculating the first target opening degree D 1 ＝D t +△D 1 (ii) a Wherein k1 is a feedforward coefficient.
In a preferred embodiment of the above control method, the step of selecting a corresponding preset adjustment mode to adjust the opening of the water ratio adjustment valve according to the comparison result includes: if delta 1 is less than or equal to A1, the opening degree of the water proportion regulating valve is firstly regulated to be a preset opening degreeD 0 (ii) a Acquiring a TDS value E2 of the water outlet after adjustment; according to the preset opening degree D 0 The current TDS value E1, the target TDS value E0 and the TDS value E2 of the water outlet after adjustment calculate a second target opening D 2 (ii) a Adjusting the opening degree of the water proportion adjusting valve to the second target opening degree D 2 。
In a preferred embodiment of the above control method, "according to the preset opening D 0 The current TDS value E1, the target TDS value E0 and the TDS value E2 of the water outlet after adjustment calculate a second target opening D 2 The specific steps of' include: calculating a second demand adjustment quantity DeltaD 2 = k2 × (E0-E2) + k3 × E0+ k4 × (E0-2 × E2+ E1); calculating the second target opening degree D 2 ＝D 0 +△D 2 (ii) a Where k2 is a proportional coefficient, k3 is an integral coefficient, and k4 is a differential coefficient.
In a preferred technical solution of the above control method, the water purifier further includes an alarm device, and the control method further includes: acquiring a TDS value E4 of water in the first waterway; selectively activating the alarm device based on the TDS value E4 of the water in the first waterway and the target TDS value E0.
In a preferred embodiment of the above control method, "selectively activating the alarm device according to the TDS value E4 of the water in the first waterway and the target TDS value E0" includes: calculating a second difference value Δ 2= E0-E4; comparing the second difference Δ 2 with a second preset value A2; selectively starting the alarm device according to the comparison result; wherein A2 is more than or equal to 0.
In a second aspect, the invention provides a water purification machine comprising a controller configured to perform the control method described above.
Under the condition of adopting the technical scheme, the water purifier disclosed by the invention can selectively adjust the opening of the water proportional control valve through the target TDS value set by a user and the current TDS value of the water outlet, so that the water inflow flowing into the water proportional control valve from the reverse osmosis membrane water purifying filter element and the front filtering filter element can be conveniently adjusted, the TDS value of the mixed water at the water outlet is further adjusted, the user can obtain the water with the required TDS value, and the use experience of the user is improved.
Furthermore, whether the target TDS value of the water outlet required by the user is equal to the current TDS value of the water outlet or not is judged, so that when the target TDS value required by the user is not equal to the current TDS value of the water outlet, the water inflow of the first water inlet and the second water inlet is adjusted by adjusting the opening degree of the water proportion adjusting valve, the TDS value of the water outlet is adjusted, the TDS value of the water outlet is made to be consistent with the target TDS value required by the user, and the user can obtain water with the target TDS value required by the user at the water outlet; when the target TDS value of user's demand is equal to the current TDS value of delivery port, then need not to adjust the aperture of water proportional control valve and obtain the water of the target TDS value of user's demand promptly at delivery port department.
Furthermore, the difference between the current TDS value E1 and the target TDS value E0 can be judged by calculating the first difference value delta 1 and comparing the first difference value delta 1 with the first preset value A1, on one hand, a regulating mode of regulating the opening degree of the water proportional regulating valve in a small amplitude is convenient to adopt when the current TDS value E1 is closer to the target TDS value E0, so that the problem that water with the target TDS value cannot be obtained due to overlarge regulating amplitude is avoided, and a regulating mode of regulating the opening degree of the water proportional regulating valve in a large amplitude is adopted when the difference between the current TDS value E1 and the target TDS value E0 is larger, so that the problems that the regulating time is too long due to overlong regulating amplitude and the regulating efficiency is influenced are avoided; on the other hand, compared with the situation that the adjustment is only carried out through a preset adjustment mode, according to the comparison result of the first difference value delta 1 and the first preset value A1, the corresponding preset adjustment mode is selected to adjust the opening degree of the water proportion adjusting valve, so that the adjustment of the TDS value of the water outlet is more accurate, the adjustment speed is higher, the efficiency is higher, and the use experience of a user is better.
Still further, the first target opening degree D is obtained empirically 1 And adjusts the opening degree of the water proportional regulating valve 133 to the first target opening degree D 1 Comparing the first target opening degree D calculated according to the TDS value E1 and the target TDS value E0 1 Then, the opening degree of the water ratio adjusting valve 133 is adjusted to the first target opening degree D 1 The aperture that can make water ratio control valve is adjusted faster, saves the regulation time of TDS value, simultaneously, also can make the calculation of first target opening value more accurate.
Still further, when the difference between the current TDS value E1 and the target TDS value E0 is small, the opening degree of the water proportion regulating valve can be regulated to be a preset opening degree D 0 Then, obtaining the TDS value E2 of the water outlet after adjustment is helpful for creating the condition of a PID control algorithm, and then presetting the opening D 0 The TDS value E2 of current TDS value E1, target TDS value E0 and delivery port after the regulation calculates second target opening D according to the PID control algorithm 2 Make also can accurately calculate the second target aperture of water proportional control valve when current TDS value E1 is very close with target TDS value E0 to adjust the second target aperture of calculating with water proportional control valve, thereby make the TDS value of the water that flows from the delivery port more accurate, further promote user's use and experience.
Still further, through set up alarm device on the purifier, can be when the TDS value E4 of the water in the first water route is higher than target TDS value E0, start alarm device in time and remind the user to change reverse osmosis membrane water purification filter core, avoid influencing user's normal use, further promote user's use and experience.
Still further, compared with the situation that the TDS value E4 and the target TDS value E0 of the water in the first water channel are directly compared, the difference value between the TDS value E4 and the target TDS value E0 of the water in the first water channel is calculated, and then the difference value is compared with the second preset value A2, so that misjudgment caused by detection errors of the TDS value E4 of the water in the first water channel can be prevented, and the judgment accuracy is improved.
In addition, the water purifier further provided on the basis of the technical scheme has the beneficial effects of the control method due to the adoption of the introduced control method, and compared with the water purifier before improvement, the water purifier disclosed by the invention can be used for quickly adjusting the TDS value of purified pure water according to the requirements of users, and simultaneously, the TDS value of the pure water obtained by the users is closer to the target TDS value, so that the use experience of the users is better.
Drawings
Preferred embodiments of the present invention are described below in conjunction with the appended drawings, wherein:
FIG. 1 is a schematic diagram of a water purifier according to the present invention;
FIG. 2 is a flow chart of a control method of the present invention;
fig. 3 is a flow chart of an embodiment of the control method of the present invention.
List of reference numerals:
1. a housing; 11. an inlet; 12. an outlet; 13. a chamber; 131. a reverse osmosis membrane water purification filter element; 1311. a first water inlet end; 1312. a first water outlet end; 132. a pre-filter element; 1321. a second water inlet end; 1322. a second water outlet end; 133. a water proportion regulating valve; 1331. a first water inlet; 1332. a second water inlet; 1333. a water outlet; 134. a water outlet waterway; 1341. a first TDS sensor; 135. a first waterway; 1351. a second TDS sensor; 136. a second waterway; 137. a first water inlet pipe; 1371. a booster pump; 138. a second water inlet pipe; 14. and an alarm device.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms "inside", "outside", and the like, which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are for convenience of description only, and do not indicate or imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, it should be noted that, in the description of the present invention, unless otherwise explicitly specified and limited, the terms "disposed" and "connected" should be interpreted broadly, and the specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a water purifier according to the present invention.
As shown in fig. 1, the water purifying machine of the present invention includes a housing 1, a chamber 13 formed in the housing 1, a pre-filtering filter element 132 and a reverse osmosis membrane water purifying filter element 131 disposed in the chamber 13, and a water proportional regulating valve 133, wherein the housing 1 of the water purifying machine has an inlet 11 and an outlet 12, and the water proportional regulating valve 133 has a first water inlet 1331, a second water inlet 1332 and a water outlet 1333.
As shown in fig. 1, the water inlet end of the reverse osmosis membrane water purification cartridge 131 is denoted as a first water inlet end 1311, the water outlet end of the reverse osmosis membrane water purification cartridge 131 is denoted as a first water outlet end 1312, the water inlet end of the pre-filter cartridge 132 is denoted as a second water inlet end 1321, and the water outlet end of the pre-filter cartridge 132 is denoted as a second water outlet end 1322. The second water inlet end 1321 of the pre-filter cartridge 132 is communicated with the inlet 11 through the first water inlet pipe 137, and the second water outlet end 1322 of the pre-filter cartridge 132 is communicated with the first water inlet end 1311 of the reverse osmosis membrane water purification cartridge 131 through the second water inlet pipe 138.
As shown in fig. 1, the water purifier further includes a first water path 135, a second water path 136 and a water outlet path 134, wherein one end of the first water path 135 is communicated with a first water outlet 1312 of the reverse osmosis membrane water purification filter element 131, the other end of the first water path 135 is communicated with a first water inlet 1331, one end of the second water path 136 is communicated with a second water outlet 1322 of the pre-filter element 132, the other end of the second water path 136 is communicated with a second water inlet 1332, one end of the water outlet path 134 is communicated with a water outlet 1333, and the other end of the water outlet path 134 is communicated with the outlet 12.
It should be noted that, in practical applications, the second water path 136 may be set to communicate with the second water inlet pipe 138 to communicate one end of the second water path 136 with the second water outlet end 1322 of the pre-filter cartridge 132, or two interfaces may be set at the second water outlet end 1322 of the pre-filter cartridge 132, wherein one interface communicates with the second water inlet pipe 138 to deliver the water filtered by the pre-filter cartridge 132 into the ro membrane water purification cartridge 131, and the other interface communicates with the second water path 136 to deliver the water filtered by the pre-filter cartridge 132 into the water ratio adjustment valve 133 through the second water inlet 1332, and so on, such flexible adjustment and change can be included in the protection scope of the present invention without departing from the principle and scope of the present invention.
Preferably, as shown in fig. 1, one end of the second waterway 136 is disposed to communicate with the second inlet pipe 138.
As shown in fig. 1, the water purifier further includes a booster pump 1371 disposed on the first water inlet pipe 137, and the booster pump 1371 can deliver water to the pre-filter cartridge 132 and the reverse osmosis membrane water purification cartridge 131.
It should be noted that, in practical applications, the water ratio adjusting valve 133 is not limited to be disposed in the housing 1, for example, the water ratio adjusting valve 133 may also be disposed outside the housing 1, and for example, a first water outlet pipe and a second water outlet pipe (not shown) are disposed on the housing 1, one end of the first water outlet pipe is communicated with the first water outlet end 1312 of the reverse osmosis membrane water purification filter element 131, the other end of the first water outlet pipe is communicated with the first water inlet 1331, one end of the second water outlet pipe is communicated with the second water outlet end 1322 of the pre-filter element 132, the other end of the second water outlet pipe is communicated with the second water inlet 1332, and so on, which can be flexibly adjusted and changed without departing from the principle and scope of the present invention, and all of which should be included in the protection scope of the present invention. It is of course preferred that the water proportional regulating valve 133 is provided inside the housing 1.
It should be noted that, in practical applications, those skilled in the art may set the water proportional regulating valve 133 such that the water inlet amount of the first water inlet 1331 decreases with the increase of the opening degree of the water proportional regulating valve 133, and the water inlet amount of the second water inlet 1332 increases with the increase of the opening degree of the water proportional regulating valve 133, or may set the water proportional regulating valve 133 such that the water inlet amount of the first water inlet 1331 increases with the increase of the opening degree of the water proportional regulating valve 133, and the water inlet amount of the second water inlet 1332 decreases with the increase of the opening degree of the water proportional regulating valve 133, and so on, and such flexible adjustment and change are not departing from the principle and scope of the present invention, and should be included in the protection scope of the present invention.
A specific embodiment of the control method of the present invention will be described below by taking as an example a case where the water proportional regulating valve 133 is set such that the inflow amount of the first water inlet 1331 decreases as the opening degree of the water proportional regulating valve 133 increases, and the inflow amount of the second water inlet 1332 increases as the opening degree of the water proportional regulating valve 133 increases.
Referring next to fig. 2, fig. 2 is a flow chart of the control method of the present invention.
As shown in fig. 2, the control method of the present invention includes the steps of:
s1000: acquiring a current TDS value E1 of a water outlet 1333;
s2000: acquiring a target TDS value E0;
s3000: the opening degree of the water proportional regulating valve 133 is selectively adjusted according to the current TDS value E1 and the target TDS value E0.
Through such setting, can be through the current TDS value of the target TDS value that the user set for and delivery port 1333, selectively adjust the aperture of water proportional control valve 133 to be convenient for adjust the inflow from reverse osmosis membrane water purification filter core 131 and leading filter core 132 inflow in the water proportional control valve 133, and then adjust the TDS value of the mixed water of delivery port 1333, make the user obtain the water of required TDS value, promote user's use experience.
It should be noted that, in practical applications, a person skilled in the art may set the target TDS value to a fixed value, or may set the target TDS value to a set value input by a user, and obtain the target TDS value according to the value input by the user, and the like, and such flexible adjustment and change are all included in the protection scope of the present invention without departing from the principle and scope of the present invention.
Preferably, the target TDS value is set to a set value input by a user.
The TDS value is the concentration of total dissolved substances in water, and is expressed in mg/L (mg/L).
It should be noted that, in practical applications, a skilled person may set a TDS detection sensor on the effluent water path 134 to obtain the current TDS value of the water outlet 1333, or may set a conductivity meter on the effluent water path 134 to feed back the current TDS value of the water outlet 1333 according to the value of the conductivity meter, or may directly receive the water sample on the effluent water path 134 and directly measure the TDS value of the water sample to obtain the current TDS value of the water outlet 1333, and the like, and such flexible adjustment and change do not depart from the principle and scope of the present invention, and all should be included in the protection scope of the present invention.
Preferably, as shown in fig. 1, a first TDS sensor 1341 is disposed on the effluent waterway 134, and a current TDS value of the water outlet 1333 is acquired through a value detected by the first TDS sensor 1341.
Referring next to fig. 3, fig. 3 is a flowchart of an embodiment of the control method of the present invention.
Preferably, as shown in fig. 3, "selectively adjusting the opening degree of the water proportional regulating valve 133 according to the current TDS value E1 and the target TDS value E0" includes:
s3100: judging whether the current TDS value E1 is equal to the target TDS value E0 or not;
s3110: if the judgment result is yes, the opening degree of the water proportional regulating valve 133 is not adjusted;
s3120: if the judgment result is "no", the opening degree of the water proportional regulating valve 133 is regulated.
With such a configuration, when the target TDS value required by the user is not equal to the current TDS value of the water outlet 1333, the opening degree of the water proportional regulating valve 133 is adjusted to adjust the water inflow of the first water inlet 1331 and the second water inlet 1332, so as to adjust the TDS value of the water outlet 1333 and make the TDS value of the water outlet 1333 coincide with the target TDS value required by the user, so that the user can obtain the water with the target TDS value required by the user at the water outlet 1333; when the target TDS value required by the user is equal to the current TDS value of the water outlet 1333, the water with the target TDS value required by the user is obtained at the water outlet 1333 without adjusting the opening degree of the water proportional regulating valve 133.
It should be noted that, in practical applications, a person skilled in the art may set the current TDS value E1 equal to the target TDS value E0 to directly compare the current TDS value E1 with the target TDS value E0, and if E1= E0, the current TDS value E1 is equal to the target TDS value E0, or may set the current TDS value E1 equal to the target TDS value E0 to calculate a difference between the current TDS value E1 and the target TDS value E0, and if the difference is within a preset range, the current TDS value E1 is equal to the target TDS value E0, and the like, such flexible adjustment and change does not deviate from the principle and range of the present invention, and all should be included in the protection range of the present invention.
Preferably, the specific step of judging whether the current TDS value E1 is equal to the target TDS value E0 includes:
calculating a third difference value delta 3= E0-E1;
comparing the third difference value delta 3 with a third preset value A3 and a fourth preset value A4 respectively;
if delta 3 is more than or equal to A3 and less than or equal to A4, the current TDS value E1 is equal to the target TDS value E0;
wherein A3 is less than 0 and A4 is more than 0.
With such a configuration, erroneous determination due to a detection error of the TDS value of the water outlet 1333 by the first TDS sensor 1341 can be avoided.
It should be noted that, in practical applications, a person skilled in the art may set the opening degree of the adjusting water proportion adjusting valve 133 to be adjusted by a preset adjusting manner, for example, by adjusting the set opening degree value for each time in a form of multiple times, or may calculate a difference between the current TDS value E1 and the target TDS value E0, and then select a corresponding preset adjusting manner according to the difference to adjust the opening degree of the water proportion adjusting valve 133, and so on, and such adjustment and change of the specific adjusting manner of the opening degree of the water proportion adjusting valve 133 do not depart from the principle and scope of the present invention, and are all included in the protection scope of the present invention.
Preferably, as shown in fig. 3, the specific step of "adjusting the opening degree of the water ratio adjusting valve 133" includes:
s3121: calculating a first difference Δ 1= | E0-E1|;
s3122: comparing the first difference Δ 1 with a first preset value A1;
s3123: selecting a corresponding preset adjusting mode to adjust the opening of the water proportional adjusting valve 133 according to the comparison result;
wherein, A1 is more than 0.
Through the arrangement, on one hand, the difference between the current TDS value E1 and the target TDS value E0 can be judged according to the comparison result of the first difference value delta 1 and the first preset value A1, so that a regulating mode of regulating the opening degree of the water proportion regulating valve 133 in a small amplitude is convenient to adopt when the current TDS value E1 is closer to the target TDS value E0, the problem that water with the target TDS value cannot be obtained due to overlarge regulating amplitude is avoided, a regulating mode of regulating the opening degree of the water proportion regulating valve 133 in a large amplitude is adopted when the difference between the current TDS value E1 and the target TDS value E0 is larger, the problem that the regulating time is overlong due to the overlong regulating amplitude, and the water outlet efficiency of the water outlet 1333 is influenced is avoided; on the other hand, compared with the situation that the adjustment is performed only by a preset adjustment mode, according to the comparison result between the first difference Δ 1 and the first preset value A1, the corresponding preset adjustment mode is selected to adjust the opening degree of the water proportion adjusting valve 133, so that the adjustment of the TDS value of the water outlet 1333 is more accurate, the adjustment speed is higher, the efficiency is higher, and the user experience is better.
It should be noted that, in practical applications, the absolute value of the difference between the current TDS value E1 and the target TDS value E0 is not limited to be calculated first, then the absolute value of the difference is compared with the first preset value, and a corresponding preset adjusting mode is selected according to the comparison result to adjust the opening degree of the water ratio adjusting valve 133, or the absolute value of the ratio between the current TDS value E1 and the target TDS value E0 is calculated first, then the absolute value of the ratio is compared with the first preset value, and a corresponding preset adjusting mode is selected according to the comparison result to adjust the opening degree of the water ratio adjusting valve 133, and so on, such flexible adjustment and change do not deviate from the principle and scope of the present invention, and all should be included in the protection scope of the present invention.
It should be noted that, in practical applications, it is not limited to first calculate the absolute value of the difference between the current TDS E1 and the target TDS E0, and then compare the absolute value with the first preset value, for example, it is also possible to first calculate the difference between the current TDS E1 and the target TDS E0, and then compare the difference with two preset values at the same time, and so on, and such flexible adjustment and change do not depart from the principle and scope of the present invention, and should be included in the protection scope of the present invention. It is of course preferred to calculate the absolute value of the difference between the current TDS value E1 and the target TDS value E0 and then compare the absolute value with the first preset value.
Preferably, the specific step of "selecting a corresponding preset adjustment manner to adjust the opening degree of the water ratio adjustment valve 133 according to the comparison result" includes:
if delta 1 is more than A1, calculating a first target opening D according to the current TDS value E1 and the target TDS value E0 1 ；
The opening degree of the water proportional regulating valve 133 is regulated to a first target opening degree D 1 。
By such an arrangement, the first target opening degree D is obtained empirically 1 And adjusts the opening degree of the water proportional regulating valve 133 to the first target opening degree D 1 Comparing the first target opening degree D calculated according to the TDS value E1 and the target TDS value E0 1 Then, the opening degree of the water proportional regulating valve 133 is regulated to the first target opening degree D 1 The aperture that can make water proportional control valve is adjusted more fast, saves the regulation time of TDS value, simultaneously, also can make the calculation of first target aperture value more accurate.
It should be noted that, in practical applications, the calculation of the first target opening D according to the current TDS value E1 and the target TDS value E0 is not limited to 1 For example, a plurality of sets of the first difference Δ 1 and the first target opening D may be found empirically 1 Then obtaining a first target opening D by comparing a plurality of groups of corresponding values 1 Etc., for the first target opening D 1 And modifications and variations of the specific embodiments may be made without departing from the spirit and scope of the invention, which should be limited only by the attached claims.
It should be noted that, in practical applications, the first target opening D of the water proportional regulating valve 133 can be directly calculated by those skilled in the art 1 Alternatively, the current opening degree of the water ratio adjusting valve 133 may be obtained, the required adjustment amount of the water ratio adjusting valve 133 may be calculated first, and then the first target opening degree D may be calculated 1 Etc., which is flexibleModifications and variations are possible without departing from the spirit and scope of the invention and are intended to be included within the scope of the invention.
Preferably, the first target opening degree D is calculated "from the current TDS value E1 and the target TDS value E0 1 The specific steps of' include:
obtain the current opening D of the water proportional control valve 133 t ；
Calculating a first demand adjustment quantity DeltaD 1 ＝k1×(E0-E1)；
Calculating a first target opening D 1 ＝D t +△D 1 (ii) a Wherein k1 is a feedforward coefficient.
By setting such that the first target opening degree D is calculated by calculating the required adjustment amount 1 And directly calculating the first target opening degree D 1 In contrast, the error of the water ratio adjusting valve 133 with respect to the first target opening D can be reduced 1 The influence that causes of regulation to the messenger is more accurate to water ratio control valve 133's regulation, and then makes the TDS value of delivery port 1333 be close target TDS value, improves the rate of accuracy that TDS adjusted.
It should be noted that in practical applications, a person skilled in the art can determine the specific value of k1 by experience or experiment.
Exemplarily, the current TDS value of the water outlet is set to E1 i Suppose that the opening degree of the water proportional control valve is adjusted by n i % (i.e. Δ D) 1 ) Then the TDS value of the water outlet is equal to the target TDS value, and the opening degree regulation n of the water proportion regulation valve is measured i % TDS value E0 of the water outlet i Repeating the above operations to obtain multiple groups of n i % of corresponding E1 i 、E0 i Substituting the data of (2) into the following formula:
△D 1 ＝k1×(E0-E1)；
the following equation is obtained:
n 1 ％＝k1×(E0 1 -E1 1 )；
n 2 ％＝k1×(E0 2 -E1 2 )；
n 3 ％＝k1×(E0 3 -E1 3 )；
n i ％＝k1×(E0 i -E1 i )；
wherein i > 0;
in the above equations, any one equation is taken as a linear equation with an unknown number k1, and the linear equation with a single element is solved to obtain the value of k 1.
It should be noted that, in order to make the obtained k1 relatively accurate, a plurality of values of k1 may be calculated through different equations, and then the plurality of values of k1 are averaged, so as to obtain the relatively accurate value k1, or the plurality of sets of data may be curve-fitted, for example, by n i % is the y-axis, in E0 i -E1 i And fitting a curve for the x axis to obtain a straight line with the slope of k1, namely obtaining a specific numerical value of k 1.
Preferably, the specific step of "selecting a corresponding preset adjustment manner to adjust the opening degree of the water ratio adjustment valve 133 according to the comparison result" includes:
if delta 1 is less than or equal to A1, the opening degree of the water proportion regulating valve 133 is firstly regulated to a preset opening degree D 0 ；
Acquiring a TDS value E2 of the adjusted water outlet 1333;
according to the preset opening D 0 The TDS values E2 of the current TDS value E1, the target TDS value E0 and the water outlet 1333 after adjustment calculate a second target opening D 2 ；
The opening degree of the water proportional regulating valve 133 is regulated to a second target opening degree D 2 。
Through such setting, when the difference between the current TDS value E1 and the target TDS value E0 is small, the opening degree of the water proportional regulating valve 133 can be regulated to the preset opening degree D 0 Then, the TDS value E2 of the regulated water outlet 1333 is acquired, which is helpful for creating the condition of the PID control algorithm, and then the opening D is preset 0 The current TDS value E1, the target TDS value E0 and the TDS value E2 of the water outlet 1333 after adjustment calculate a second target opening D according to a PID control algorithm 2 So that the current TDS value E1 and the target TDS value E0 can be accurately calculatedSecond target opening degree D of the water proportional regulating valve 133 2 And adjusts the water ratio adjusting valve 133 to the calculated second target opening degree D 2 Therefore, the TDS value of the water flowing out of the water outlet 1333 is more accurate, and the use experience of a user is further improved.
It should be noted that, in practical applications, the preset opening D can be determined by those skilled in the art based on experience or experiment 0 Or, the preset opening degree D can be set 0 Directly fixed, etc., and such flexible adjustments and changes without departing from the principle and scope of the present invention are intended to be included in the scope of the present invention.
Preferably, the preset opening degree D is empirically determined 0 The opening degree value of (a).
It should be noted that, in practical applications, a person skilled in the art may calculate the value of the second target opening degree D2 according to a position-based PID control algorithm, or may calculate the value of the second target opening degree D2 according to an incremental PID control algorithm, etc., and such flexible adjustment and change do not depart from the principle and scope of the present invention, and are all included in the protection scope of the present invention.
Preferably "according to a preset opening D 0 The current TDS value E1, the target TDS value E0 and the adjusted TDS value E2 of the water outlet 1333 calculate a second target opening D 2 The specific steps of' include:
calculating a second demand manipulated variable DeltaD 2 ＝k2×(E0-E2)+k3×E0+k4×(E0-2×E2+E1)；
Calculating a second target opening degree D 2 ＝D 0 +△D 2 ；
Where k2 is a proportional coefficient, k3 is an integral coefficient, and k4 is a differential coefficient.
Through such setting, compare with the situation that calculates the second demand regulating variable through position formula PID control algorithm, calculate the second demand regulating variable through incremental PID control algorithm, can only calculate the second demand regulating variable according to the TDS value of delivery port 1333 that the cubic was obtained, it is simpler to calculate, reduce calculation error, also can accurately calculate the second demand regulating variable when the purifier has trouble simultaneously, thereby improve the calculation accuracy of second target aperture, and then improved the accuracy of the TDS value of delivery port 1333, make the TDS value of delivery port 1333 after adjusting more be close to the target TDS value of user's demand, further promote user's use experience.
Note that, when the opening degree of the water ratio adjustment valve 133 is set in units and the unit of the TDS value is mg/L, the units of k1, k2, k3, and k4 are L/100mg for the sake of unity.
It should be noted that in practical applications, the specific values of k2, k3 and k4 can be determined by those skilled in the art through experience or experiment.
Exemplarily, the current TDS value of the water outlet is set to E1 j Adjusting the opening degree of the water proportion adjusting valve to a preset opening degree D 0 The TDS value of the water outlet is E2 j Suppose that the opening of the water proportion regulating valve is regulated by m j % (i.e. DeltaD) 2 ) Can make the TDS value of delivery port equal with the target TDS value, set for the aperture of water proportional control valve and increase m j % later TDS value of water outlet is E0 j And measuring the opening degree of the water proportional control valve to be increased by m j % after water outlet TDS value E0 j Repeating the above operations to obtain multiple groups and m j % of corresponding E1 j 、E2 j 、E0 j Substituting the sets of data into the following equation:
△D 2 ＝k2×(E0-E2)+k3×E0+k4×(E0-2×E2+E1)；
the following equation is obtained:
m 1 ％＝k2×(E0 1 -E2 1 )+k3×E0 1 +k4×(E0 1 -2×E2 1 +E1 1 )；
m 2 ％＝k2×(E0 2 -E2 2 )+k3×E0 2 +k4×(E0 2 -2×E2 2 +E1 2 )；
m 3 ％＝k2×(E0 3 -E2 3 )+k3×E0 3 +k4×(E0 3 -2×E2 3 +E1 3 )；
m j ％＝k2×(E0 j -E2 j )+k3×E0 j +k4×(E0 j -2×E2 j +E1 j )；
wherein j is greater than 0.
In the above equations, any three equations are taken to form a ternary linear system of equations with unknowns k2, k3 and k4, and the ternary linear system of equations is solved, i.e. the values of k2, k3 and k4 can be calculated.
A specific embodiment of whether or not the opening degree of the water ratio adjusting valve 133 needs to be adjusted will be described in detail with reference to several cases.
A3= -2mg/L, and A4=2mg/L are set.
The first situation is as follows:
if the current TDS value E1=20mg/L and the target TDS value E0=20mg/L, E1= E0, the opening degree of the water proportional regulating valve 133 is not adjusted.
The second situation:
if the current TDS value E1=21mg/L, the target TDS value E0=20mg/L;
if Δ 3= E0-E1=20-21= 1mg/L and A3 is smaller than Δ 3 and smaller than A4, the opening of the water proportional control valve 133 is not adjusted.
A third situation:
if the current TDS value E1=15mg/L, the target TDS value E0=20mg/L;
if Δ 3= eh0-E1 =20-15=5mg/L and Δ 3 > A4, the corresponding preset adjustment manner is selected to adjust the opening degree of the water ratio adjustment valve 133.
Case four:
if the current TDS value E1=25mg/L, the target TDS value E0=20mg/L;
if Δ 3= eh0-E1 =20-25= -5mg/L and Δ 3 < A3, the corresponding preset adjustment manner is selected to adjust the opening degree of the water proportional control valve 133.
It should be noted that in practical applications, a person skilled in the art can determine the specific value of A1 by experience or experiment.
Exemplarily, A1=5mg/L.
The embodiment of the present invention for adjusting the opening degree of the water ratio adjusting valve 133 will be described in detail with reference to several cases.
The first situation is as follows:
if the current TDS value E1=30mg/L, the target TDS value E0=15mg/L;
the first difference Δ 1= | E0-E1| = |15-30| = |15 mg/L, Δ 1 > A1;
first demand adjustment quantity DeltaD is calculated 1 Then adjusting quantity delta D according to the first demand 1 And the current opening degree D t To calculate a first target opening degree D 1 。
The second situation:
if the current TDS value E1=5mg/L, the target TDS value E0=15mg/L;
then the first difference Δ 1= | E0-E1| = |15-5| =10mg/L, Δ 1 > A1;
first demand adjustment quantity DeltaD is calculated 1 Then adjusting quantity delta D according to the first demand 1 And the current opening degree D t To calculate a first target opening degree D 1 。
A third situation:
if the current TDS value E1=20mg/L, the target TDS value E0=15mg/L;
then the first difference Δ 1= | E0-E1| = |15-20| =5mg/L,. DELTA.1 = a1;
the opening degree of the water proportional regulating valve 133 is first regulated to the preset opening degree D 0 Then, a second demand adjustment quantity DeltaD is calculated 2 Then adjusting quantity delta D according to the preset opening D0 and the second requirement 2 To calculate a second target opening degree D 2 。
Case four:
if the current TDS value E1=18mg/L, the target TDS value E0=15mg/L;
the first difference Δ 1= | E0-E1| = |15-18| =3mg/L, Δ 1 < A1;
the opening degree of the water proportional regulating valve 133 is first regulated to the preset opening degree D 0 Then, a second demand adjustment quantity DeltaD is calculated 2 Then adjusting the quantity delta D according to the preset opening D0 and the second requirement 2 To calculate a second target opening degree D 2 。
Case five:
if the current TDS value E1=12mg/L, the target TDS value E0=15mg/L;
the first difference Δ 1= | E0-E1| = |15-12| =3mg/L, Δ 1 < A1;
the opening degree of the water proportional regulating valve 133 is first regulated to the preset opening degree D 0 Then, a second demand adjustment quantity DeltaD is calculated 2 Then adjusting quantity delta D according to the preset opening D0 and the second requirement 2 To calculate a second target opening degree D 2 。
With respect to the first target opening degree D 1 And a second target opening degree D 2 The calculation process of (a) is not described in detail herein.
It should be noted that, in practical applications, along with the use of the reverse osmosis membrane water purification filter element 131, the TDS value of the water purified by the reverse osmosis membrane water purification filter element 131 gradually increases, especially when the service life of the reverse osmosis membrane water purification filter element 131 reaches the theoretical service life, the TDS value in the first water channel 135 increases, and when the TDS value in the first water channel 135 increases to the target TDS value, the water with the target TDS value required by the user cannot be obtained from the water outlet 1333, so that the reverse osmosis membrane water purification filter element 131 needs to be replaced by the user in time.
It should be noted that, in practical applications, a person skilled in the art may periodically replace the reverse osmosis membrane water purification cartridge 131 based on experience, or may also set an alarm device on the water purification machine, selectively activate the alarm device according to the TDS value in the first water path 135 and the target TDS value, and issue an alarm through the alarm device to prompt a user to replace the reverse osmosis membrane water purification cartridge 131, and the like, and such flexible adjustment and change do not depart from the principle and scope of the present invention and are all included in the protection scope of the present invention.
Preferably, as shown in fig. 1, the water purifier further comprises an alarm device 14, and the alarm device 14 can give an alarm to a user.
Preferably, the control method of the present invention further comprises the steps of:
acquiring a TDS value E4 of the water in the first water circuit 135;
the alarm device 14 is selectively activated based on the TDS value E4 and the target TDS value E0 of the water in the first water circuit 135.
Through such setting, be convenient for when the TDS value E4 of the water in the first water route 135 is higher than target TDS value E0, then no matter how adjusting water proportional control valve 133's aperture, also can't obtain the required target TDS value of user, can start alarm device 14 in time at this moment and remind the user to change reverse osmosis membrane water purification filter core 131, avoid influencing user's normal use, further promote user's use and experience.
It should be noted that in practical applications, a person skilled in the art may configure the alarm device 14 as an audible alarm unit, or may configure the alarm device 14 as an optical alarm unit, or may configure the alarm device 14 as an acoustic and optical combined alarm unit, etc., and such adjustments and changes to the specific configuration type of the alarm device 14 without departing from the principle and scope of the present invention shall be included in the protection scope of the present invention.
Preferably, the alarm device 14 is provided as a combined sound and light alarm unit.
It should be noted that, in practical applications, a person skilled in the art can directly compare the TDS value E4 of the water in the first water path 135 with the target TDS value E0, and selectively activate the alarm device 14 according to the comparison result, or, a difference between the TDS value E4 of the water in the first water path 135 and the target TDS value E0 can be calculated first, then the difference is compared with a preset value, and the alarm device 14 is selectively activated according to the comparison result, or, a ratio between the TDS value E4 of the water in the first water path 135 and the target TDS value E0 can be calculated first, and the alarm device 14 is selectively activated according to the comparison result, and so on, such flexible adjustment and change should not depart from the principle and scope of the present invention, and should be included in the protection scope of the present invention.
Preferably, the specific steps of selectively activating the alarm device 14 "based on the TDS value E4 and the target TDS value E0 of the water in the first water circuit 135" include:
calculating a second difference value Δ 2= E0-E4;
comparing the second difference value delta 2 with a second preset value A2;
selectively activating the alarm device 14 according to the comparison result;
wherein A2 is more than or equal to 0.
Through such a setting, compared with the situation that the TDS value E4 and the target TDS value E0 of the water in the first water path 135 are directly compared, the difference between the TDS value E4 and the target TDS value E0 of the water in the first water path 135 is calculated first, and then the difference is compared with the second preset value A2, so that the misjudgment caused by the detection error of the TDS value E4 of the water in the first water path 135 can be prevented, and the accuracy of the judgment is improved.
Preferably, the specific step of selectively activating the alarm device 14 "according to the comparison result includes: if Δ 2 > A2, the alarm device 14 is not activated.
Through such setting, when delta 2 > A2, it still is less than target TDS value to explain the TDS value of the water in the first water route 135, even the TDS value of the water after reverse osmosis membrane water purification filter element 131 purifies has risen this moment, still can call out the water of the target TDS value of user's demand, namely, reverse osmosis membrane water purification filter element 131 still can continue to use, can reduce the frequency of changing reverse osmosis membrane water purification filter element 131, help the user to save the cost, further promote user's use experience.
Preferably, the specific step of selectively activating the alarm device 14 "according to the comparison result includes: if the delta 2 is not less than A2 and the duration time of the delta 2 not less than A2 exceeds the preset time, the alarm device 14 is started.
Through the arrangement, on one hand, when delta 2 is less than or equal to A2, the TDS value of the water in the first water channel 135 is increased to be closer to the target TDS value, and at this moment, the water with the target TDS value required by a user is probably not obtained, so that the alarm device 14 is started to remind the user to replace the reverse osmosis membrane water purification filter element 131 in time so as to avoid influencing the normal use of the user; on the other hand, compared with the method that the alarm device 14 is started only when the Δ 2 is larger than or equal to the A2, the alarm device 14 is started when the duration time of the Δ 2 is larger than or equal to the A2 exceeds the preset time, so that misjudgment caused by detection errors at a certain time can be avoided, and the use experience of a user is further improved.
It should be noted that, in practical applications, a person skilled in the art may set a TDS sensor on the first water path 135 to obtain the TDS value E4 in the first water path 135, or may set a conductivity meter on the first water path 135 to feed back the TDS value in the first water path 135 according to the data of the conductivity meter, and so on, and such flexible adjustment and change do not depart from the principle and scope of the present invention, and all of them should be included in the protection scope of the present invention.
Preferably, as shown in fig. 1, a second TDS sensor 1351 is disposed on the first waterway 135.
It should be noted that the water purifier of the present invention further comprises a controller, and the controller is configured to execute the control method described above.
It should be further noted that, in practical applications, a person skilled in the art may set the controller to be in communication connection with the first TDS sensor 1341 and the second TDS sensor 1351, so as to achieve intelligent data acquisition of the water purifier, may also set the controller to be in communication connection with the water ratio adjusting valve 133, so as to achieve automatic adjustment of the water ratio adjusting valve 133, and may also set the controller to be in communication connection with the alarm device 14, so as to achieve intelligent reminding of the water purifier, thereby further improving the user experience.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. A control method for a water purifier is characterized in that the water purifier comprises a preposed filtering filter element, a reverse osmosis membrane water purifying filter element, a first water channel, a second water channel, a water proportion adjusting valve and a water outlet water channel, wherein the water outlet end of the preposed filtering filter element is communicated with the water inlet end of the reverse osmosis membrane water purifying filter element, the water proportion adjusting valve is provided with a first water inlet, a second water inlet and a water outlet, one end of the first water channel is communicated with the water outlet end of the reverse osmosis membrane water purifying filter element, the other end of the first water channel is communicated with the first water inlet, one end of the second water channel is communicated with the water outlet end of the preposed filtering filter element, the other end of the second water channel is communicated with the second water inlet, the water outlet water channel is communicated with the water outlet, the water inlet amount of the first water inlet is reduced along with the increase of the opening degree of the water proportion adjusting valve, and the water inlet amount of the second water inlet is increased along with the increase of the opening degree of the water proportion adjusting valve, and the control method comprises the following steps:
acquiring a current TDS value E1 of the water outlet;
acquiring a target TDS value E0;
and selectively adjusting the opening degree of the water proportion adjusting valve according to the current TDS value E1 and the target TDS value E0.
2. The control method as claimed in claim 1, wherein the specific step of selectively adjusting the opening degree of the water proportional regulating valve according to the current TDS value E1 and the target TDS value E0 includes:
judging whether the current TDS value E1 is equal to the target TDS value E0 or not;
if the judgment result is 'yes', the opening degree of the water proportion regulating valve is not regulated;
and if the judgment result is 'no', adjusting the opening of the water proportion adjusting valve.
3. The control method according to claim 2, wherein the step of "adjusting the opening degree of the water ratio adjusting valve" includes:
calculating a first difference Δ 1= | E0-E1|;
comparing the first difference Δ 1 with a first preset value A1;
selecting a corresponding preset adjusting mode to adjust the opening of the water proportion adjusting valve according to the comparison result;
wherein A1 is greater than 0.
4. The control method according to claim 3, wherein the step of selecting a corresponding preset adjustment manner to adjust the opening degree of the water ratio adjustment valve according to the comparison result comprises:
if delta 1 is larger than A1, calculating a first target opening D according to the current TDS value E1 and the target TDS value E0 1 ；
Adjusting the opening degree of the water proportional control valve to the first target opening degree D 1 。
5. The control method according to claim 4, characterized in that "calculating a first target opening degree D based on the current TDS value E1 and the target TDS value E0 1 The specific steps of' include:
obtaining the current opening D of the water proportion regulating valve t ；
Calculating a first demand manipulated variable DeltaD 1 ＝k1×(E0-E1)；
Calculating the first target opening D 1 ＝D t +△D 1 ；
Wherein k1 is a feedforward coefficient.
6. The control method according to claim 3, wherein the step of selecting a corresponding preset adjustment manner to adjust the opening degree of the water ratio adjustment valve according to the comparison result comprises:
if delta 1 is less than or equal to A1, the opening of the water proportion adjusting valve is adjusted to be a preset opening D 0 ；
Acquiring a TDS value E2 of the water outlet after adjustment;
according to the preset opening D 0 The current TDS value E1, the target TDS value E0 and the TDS value E2 of the water outlet after adjustment calculate a second target opening D 2 ；
Adjusting the opening degree of the water proportion adjusting valve to the second target opening degree D 2 。
7. The control method according to claim 6, characterized in thatIs characterized in that the opening degree D is preset according to 0 The current TDS value E1, the target TDS value E0 and the TDS value E2 of the water outlet after adjustment calculate a second target opening D 2 The specific steps of' include:
calculating a second demand adjustment quantity DeltaD 2 ＝k2×(E0-E2)+k3×E0+k4×(E0-2×E2+E1)；
Calculating the second target opening degree D 2 ＝D 0 +△D 2 ；
Where k2 is a proportional coefficient, k3 is an integral coefficient, and k4 is a differential coefficient.
8. The control method according to any one of claims 1 to 7, wherein said water purifier further comprises an alarm device, said control method further comprising:
acquiring a TDS value E4 of water in the first waterway;
selectively activating the alarm device based on the TDS value E4 of the water in the first waterway and the target TDS value E0.
9. The control method of claim 8, wherein the step of selectively activating the alarm device based on the TDS value E4 and the target TDS value E0 of the water in the first waterway comprises:
calculating a second difference value Δ 2= E0-E4;
comparing the second difference Δ 2 with a second preset value A2;
selectively starting the alarm device according to the comparison result;
wherein A2 is more than or equal to 0.
10. A water purification machine comprising a controller configured to perform the control method of any one of claims 1 to 9.
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CN117742132A (en) * 2023-12-20 2024-03-22 上海水成环保科技股份有限公司 Method, device, equipment and computer readable medium for controlling water quality parameters

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