CN115900089B - Method and device for controlling water inlet temperature of gas water heater - Google Patents
Method and device for controlling water inlet temperature of gas water heater Download PDFInfo
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Abstract
The invention discloses a method and a device for controlling the water inlet temperature of a gas water heater, which are used for controlling the gas water heater to work until a water flow with stable temperature is output for a first preset time period; obtaining a measured water inlet temperature based on the actual water outlet temperature, the actual water flow value and the actual proportional valve current; judging whether the difference between the measured water inlet temperature and the actual water inlet temperature is within a preset threshold range; if so, controlling the gas water heater to work still based on the actual inlet water temperature in the subsequent combustion, and if the difference value is out of the preset threshold range; then the measured water inlet temperature is used for replacing the actual water inlet temperature in the subsequent combustion to control the gas water heater to work. According to the method and the device for controlling the water inlet temperature of the gas water heater, the calculated combustion load value is more similar to the actual load value by measuring and calculating the water inlet temperature and compensating the water inlet temperature, so that the constant temperature performance of the gas water heater is improved, and the system control is stable and reliable.
Description
Technical Field
The invention relates to a control method of a water heater, in particular to a control method and a device for water inlet temperature of the water heater.
Background
As shown in fig. 1, a system schematic diagram of a general gas water heater generally comprises a gas proportional valve 1, a water inlet temperature sensor 2, a water flow sensor 3, a segmented pipe 4, an electric controller assembly 5, a heat exchanger 6, a burner 7, a fan 8 and a water outlet temperature sensor 9.
When the water heater is designed, different fuel gas proportional threshold current values I are measured in a standard state, a corresponding combustion load value Q b of the fuel gas water heater is calculated, the water flow rate is x (water outlet temperature-water inlet temperature), and the water flow rate is recorded in a control program. When a user uses hot water, the electric controller assembly 5 detects the water inlet temperature t j through the water inlet temperature sensor 2, detects the water flow value q through the water flow sensor 3, and the set temperature of the user is ts and the actual water outlet temperature t c. Thus, the electric controller assembly 5 can calculate the combustion load value Q x＝q(ts-tj required by the water heater). And then according to the calculated required combustion load value Q x, searching a corresponding fuel gas proportional valve current value I in a standard state, and taking the current value I as a reference to perform flame combustion control.
However, the corresponding relation between the fuel gas proportional valve current value I and the combustion load value Q b is measured in a standard state, if the natural gas composition in the user's home has a large deviation (the heat value is higher or lower); or after the water heater is used for a long time, the combustion state is changed; or the efficiency is reduced due to carbon deposition in the heat exchanger and scaling of the heat exchange tube of the heat exchanger, and the like, all of these factors will cause the deviation of the actual combustion load value Q S of the water heater from the standard combustion load value Q b under a certain fuel gas proportional valve current value I. Eventually, the temperature exceeds the temperature in the combustion heating control process or the temperature can reach the set temperature for a long time. Thus, a suitable control method is required to adjust the system bias.
Disclosure of Invention
The invention aims to overcome the defects caused by system deviation of a gas water heater caused by various problems in the prior art, and provides a water inlet temperature control method and a water inlet temperature control device which can automatically adjust the water inlet temperature so that the water outlet temperature of the water heater can quickly and accurately reach the set temperature.
The invention solves the technical problems by the following technical scheme: a method for controlling the inlet water temperature of a gas water heater is characterized by comprising the following steps: the method comprises the following steps:
Controlling the gas water heater to work until a water flow with stable temperature is output for a first preset time period t1;
Based on the actual outlet water temperature T c1, the actual water flow value q 1 and the actual proportional valve current I 1, obtaining a measured inlet water temperature T j2;
Judging whether the difference value delta T between the measured inlet water temperature T j2 and the actual inlet water temperature T j1 is within a preset threshold range delta Ts or not;
If yes, controlling the gas water heater to work still based on the actual water inlet temperature T j1 in the subsequent combustion, and if the difference value delta T is out of the preset threshold range delta Ts; and replacing the actual inlet water temperature T j1 with the measured inlet water temperature T j2 in the subsequent combustion to control the gas water heater to work.
Preferably, the obtaining the measured inlet water temperature T j2 based on the actual outlet water temperature T c1, the actual water flow value q 1, and the actual proportional valve current I 1 further includes,
Obtaining a corresponding actual combustion load value Q 1 based on the actual proportional valve current I 1, wherein the measured inlet water temperature T j2 is T j2＝Tc1-Q1/q1;
wherein T j2 is the measured water inlet temperature, Q 1 is the actual combustion load value corresponding to the actual proportional valve current I 1, and Q 1 is the actual water flow value.
Preferably, the gas water heater is controlled to work until a first preset time period T1 of water flow with stable temperature is output, specifically, a required initial combustion load value Q 0 is calculated based on a preset water outlet temperature T c, an initial water inlet temperature T j0 and an initial water flow value Q 0 at the beginning of combustion of the gas water heater, and an initial proportional valve current I 0 is obtained according to the initial combustion load value Q 0, so that the gas water heater is controlled to work under the initial proportional valve current I 0.
Preferably, the controlling the gas water heater to work further comprises, before outputting the water flow with stable temperature for a first preset time period t1, establishing a table look-up database between the combustion load value and the proportional valve current in a standard state.
Preferably, if the difference is outside the preset threshold range Δts; then in the subsequent combustion, the measured and calculated water inlet temperature T j2 is used for replacing the actual water inlet temperature to control the gas water heater to work, and the specific steps are as follows:
And after the combustion is finished, acquiring the latest actual inlet water temperature T j3, using the difference value delta T j between the latest actual inlet water temperature T j3 and the actual inlet water temperature T j1 to correct the measured inlet water temperature T j2, and replacing the corrected measured inlet water temperature T j2 with the actual inlet water temperature in the subsequent combustion to control the gas water heater to work.
Preferably, if the measured inlet water temperature T j2 is used to replace the actual inlet water temperature T j1 to control the gas water heater to operate in the subsequent combustion, the method further includes, before the subsequent combustion, determining whether the time point difference Δt between the measured inlet water temperature T j2 and the actual inlet water temperature T j1, which is judged to be within the preset threshold range Δts before the previous time, is within a second preset time period, and if so, continuing; if not, it is necessary to re-determine whether the difference Δt between the measured inlet water temperature T j2 and the actual inlet water temperature T j1 is within the preset threshold range Δts.
In another aspect, the invention discloses a water inlet temperature control device of a gas water heater, which is characterized by comprising
The water inlet temperature acquisition unit is used for acquiring the water inlet temperature in the water inlet pipe of the gas water heater;
the water outlet temperature acquisition unit is used for acquiring water outlet temperature, wherein the water outlet temperature comprises preset water outlet temperature and water outlet temperature of a water outlet pipe of the gas water heater;
The flow obtaining unit is used for obtaining the flow value in the pipeline of the gas water heater;
the current acquisition unit is used for acquiring the proportional valve current of the gas water heater;
The calculating unit is used for obtaining and calculating the water inlet temperature T j2 based on the water outlet temperature, the water flow value and the proportional valve current, or obtaining corresponding proportional valve current based on the water outlet temperature, the water inlet temperature and the water flow value;
The first judging unit is used for judging whether the difference value delta T between the measured water inlet temperature T j2 and the actual water inlet temperature T j1 is within a preset threshold range delta Ts;
And the control unit is used for controlling the gas water heater to work under the corresponding proportional valve current.
Preferably, the calculation unit further comprises a look-up table database of combustion load values and proportional valve currents.
Preferably, the calculating unit further comprises a correcting unit for correcting and measuring the temperature of the water.
Preferably, the device further comprises a second judging unit, configured to judge whether a time difference Δt between a time point before the start of the subsequent combustion and a time point when the previous judgment is made as to whether the difference Δt between the measured intake temperature T j2 and the actual intake temperature T j1 is within the preset threshold range Δts is within a second preset time period.
An electronic device, comprising:
at least one processor; and
A memory communicatively coupled to the at least one processor; wherein,
The memory stores instructions executable by the at least one processor to enable the at least one processor to perform any one of the methods described above.
A non-transitory computer readable storage medium storing computer instructions for causing the computer to perform a method according to any one of the above.
The invention has the positive progress effects that: according to the method and the device for controlling the water inlet temperature of the gas water heater, provided by the invention, the calculated combustion load value is more approximate to the actual load value by measuring and calculating the water inlet temperature and compensating the water inlet temperature, so that the constant temperature performance of the gas water heater is improved, and the system control is stable and reliable.
Drawings
FIG. 1 is a schematic diagram of a prior art gas water heater system;
FIG. 2 is a flow chart of a method for controlling inlet water temperature of the gas water heater according to embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of a specific flow chart of step S1 of the water inlet temperature control method of the gas water heater in embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of a specific flow chart of step S2 of the water inlet temperature control method of the gas water heater in embodiment 1 of the present invention;
FIG. 5 is a flow chart of a method for controlling inlet water temperature of a gas water heater according to embodiment 2 of the present invention;
FIG. 6 is a schematic diagram of a water inlet temperature control device of a gas water heater in accordance with embodiment 3 of the present invention;
fig. 7 is a schematic block diagram of an exemplary electronic device 500 provided in embodiment 4 of the present invention.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 2, a flow chart of a method for controlling the inflow temperature of the gas water heater according to embodiment 1 is shown, and the control method is also based on the fact that a table look-up relationship is established between a gas proportional valve current value I measured in a standard state and a corresponding combustion load value Q of the gas water heater when the water heater is designed, wherein the combustion load value q=water flow× (outflow temperature-inflow temperature) of the gas water heater, and the data of the gas proportional valve current value I and the combustion load value Q are formed into a table look-up database and recorded in a control program.
The water inlet temperature control method comprises the following steps:
s1, firstly, controlling the gas water heater to work until a water flow with stable temperature is output for a first preset time period t1. The control gas water heater works, as shown in fig. 3, specifically comprises:
S11, acquiring a preset water outlet temperature T c, wherein the acquisition of the preset water outlet temperature is generally based on the preset of a user; the method comprises the steps of obtaining an initial water flow value q 0 when the combustion of the gas water heater begins, detecting the initial water flow value q 0 through a flow sensor, and obtaining the initial water flow value when the gas water heater needs to be filled with water and then burnt before the combustion begins; an initial inlet water temperature T j0 at the beginning of combustion of the gas water heater is obtained, and the initial inlet water temperature T j0 is also obtained through an inlet water temperature sensor arranged on the inlet water pipe.
S12, calculating to obtain a required initial combustion load value Q 0 based on a preset water outlet temperature T c, an initial water inlet temperature T j0 and an initial water flow value Q 0 at the beginning of combustion of the gas water heater, and obtaining an initial proportional valve current I 0 according to the initial combustion load value Q 0 through the table lookup database.
S13, controlling the gas water heater to work under the initial proportional valve current I 0.
Of course, when the gas water heater is just started, the control algorithm of the gas water heater generally sets the proportional current to be higher than the initial proportional valve current so as to be used for quickly heating the water temperature, and the proportional valve current can be reduced when the water temperature reaches a certain degree, and the gas water heater is controlled to continuously work under the value of the initial proportional valve current. Therefore, the measurement needs to be started after the water outlet is stabilized for a first preset period of time.
Preferably, the first preset time period may be 5s to 20s, preferably 10s.
S2, obtaining a measured water inlet temperature T j2 based on the actual water outlet temperature T c1, the actual water flow value q 1 and the actual proportional valve current I 1. Specifically, as shown in fig. 4,
S21, acquiring an actual water outlet temperature T c1, an actual water flow value q 1 and an actual proportional valve current I 1.
S22, determining an actual combustion load value Q 1 through the actual proportional valve current I 1 and a table look-up database of the system.
S23, obtaining an actual combustion load value corresponding to the actual proportional valve current I 1 by the calculated water inlet temperature T j2,Q1 through a formula T j2＝Tc1-Q1/q1, wherein q 1 is an actual water flow value.
S3, specifically comprising S31, judging whether the difference value DeltaT between the measured inflow water temperature T j2 and the actual inflow water temperature T j1 is within a preset threshold range DeltaTs; preferably, the preset threshold range Δts may be ±3 ℃.
S32, if yes, controlling the water heater to work in the subsequent combustion based on the actual water inlet temperature T j1; that is, in the subsequent process of controlling the gas water heater, the required combustion load value is obtained according to the actual measured inlet water temperature T j1, the preset outlet water temperature and the actual water flow value, the corresponding proportional valve current is obtained according to the combustion load value, and then the gas water heater works under the proportional valve current. I.e. the step S1 is skipped, the determination of the difference between the actual inlet water temperature and the measured inlet water temperature is still performed again.
S33, if the difference value delta T is outside the preset threshold range delta Ts; and replacing the actual inlet water temperature T j1 with the measured inlet water temperature T j2 in the subsequent combustion to control the gas water heater to work.
Generally, the actual inlet water temperature T j1 should be the same as the initial inlet water temperature T 0 obtained in S1, because the inlet water temperature is unlikely to vary too much in a short time. Therefore, the initial inlet water temperature T 0 obtained in the step of controlling the water heater in S1 may be directly assigned to the actual inlet water temperature T j1 to be determined and calculated.
Preferably, in order to more accurately control the subsequent combustion, the water inlet temperature sensor can be used for acquiring the latest actual water inlet temperature T j3 again after the combustion is completed, the difference value delta T j between the latest actual water inlet temperature T j3 and the actual water inlet temperature T j1 is calculated and used for correcting the measured water inlet temperature T j2, namely, the measured water inlet temperature is corrected to be T j2+ΔTj, and the corrected measured water inlet temperature is used for replacing the actual water inlet temperature in the subsequent combustion to control the gas water heater to work. Of course this step can also be omitted, since the actual inlet water temperature does not change too much in a short time.
The principle of the control method of the water inlet temperature is to utilize the measurement and calculation of the water inlet temperature to compensate. Generally, under the condition of no loss and no system deviation, after the standard combustion load value Q b is obtained by calculating according to the preset water outlet temperature, water inlet temperature and water flow value, the Q b is the initial combustion load value Q 0, and the gas water heater is controlled to work under the state of the initial proportional valve current I 0 corresponding to the standard combustion load value Q b, so that the constant preset water outlet temperature T c can be obtained. However, considering the system deviation of natural gas components of the gas water heater, the combustion state change of the water heater after long use, and the like, and also considering that the gas water heater can automatically adjust the proportional valve current according to the actual outlet water temperature T, the actual combustion load value Q 1 is often different from the standard combustion load value Q b. In order to set the standard combustion load value close to the actual combustion load value in the initial control stage, it is necessary to make some adjustments to the standard combustion load value calculated at the initial time of control according to the actual situation.
The actual combustion load value Q 1 should be equal to the standard combustion load value Q b in the normal state, that is:
Q1＝q0(Tc-Tj0)＝Qb
However, this equation is no longer satisfied due to systematic deviations, resulting in an actual outlet water temperature that does not correspond to the preset outlet water temperature. If the equation is to be satisfied, a variable in the equation must be compensated. The standard output heat Q b is marked in a program in the whole machine design process and is used as combustion pre-judgment, and is generally not suitable to be changed; the water flow is required to be used as the detection of the starting and stopping of the water heater and is not easy to change; the control index of the water heater, the actual outlet water temperature of which is the most important, cannot be modified. Therefore, the temperature of the inlet water can only be used as a compensation variable when the system is deviated. Therefore, the method of the embodiment of the invention refers to the water inlet temperature obtained by obtaining the actual proportional valve current, the actual water outlet temperature and the actual water flow value, as the water inlet temperature T j2. The calculation mode is that T j2＝Tc1-Q1/q1,Q1 is an actual combustion load value corresponding to an actual proportional valve current I 1, q 1 is an actual water flow value, and T c1 is an actual water outlet temperature.
When the actual combustion load value Q 1 is larger than the standard combustion load value Q b, for example, when the heat value of the fuel gas is higher, the fuel gas proportional valve current value I required by the preset outlet water temperature T c to be burnt needs to be smaller, at this time, the corresponding standard combustion load value Q 0 is also smaller, and according to the formula, the measured inlet water temperature T j2 needs to be larger. The combustion load value Q calculated by adopting the measured water inlet temperature T j2 in the subsequent combustion heating process is correspondingly reduced. Thereby reversely compensating for the situation where the actual combustion load value Q 1 is large. The phenomenon of temperature overshoot in the combustion control process is prevented.
When the actual combustion load value Q 1 is smaller than the standard combustion load value Q b, for example, the heat value of the fuel gas is lower or the efficiency is reduced due to carbon deposition in the heat exchanger, scaling of the heat exchange tube, etc., the current value I of the fuel gas proportional valve required for burning the preset water outlet temperature T c needs to be increased, at this time, the corresponding standard combustion load value Q b is also increased, and according to the formula, the measured water inlet temperature T j2 needs to be decreased. When the water inlet temperature T j2 is measured and calculated in the subsequent combustion heating process, the combustion load value Q calculated is correspondingly increased. Thereby reversely compensating for the situation where the actual combustion load value Q 1 is small. The phenomenon that the set temperature cannot be reached for a long time in the combustion control process is prevented.
Example 2
This example is another embodiment of the control method of the present invention, as shown in fig. 5, in which S1'-S3' is substantially the same as S1-S3 of the first example, except that the method further includes step S34 'after step S33'.
S34', namely before the subsequent combustion starts, determining whether a difference delta T between the current time and the previous measured inlet water temperature T j2 and the actual inlet water temperature T j1 is within a preset threshold range delta Ts or not, namely, whether a time difference between the current time and the execution of the step S31 is within a second preset time period T2 or not. If yes, continuing to control the gas water heater by replacing the actual water inlet temperature with the measured and calculated water inlet temperature T j2 according to the previous judgment.
If not, the step is skipped back to S1, and the actual water inlet temperature is started, and whether the difference value delta T between the actual water inlet temperature T j1 and the measured water inlet temperature T j2 is within the preset threshold range delta Ts is judged again.
The second preset time period t2 is usually less than or equal to 24 hours, and this step is mainly used for avoiding a large change of the actual water inlet temperature after too long a time.
Example 3
As shown in FIG. 6, the water inlet temperature control device for a gas water heater according to embodiment 3 of the present invention comprises
The water inlet temperature acquisition unit is used for acquiring the water inlet temperature in the water inlet pipe of the gas water heater; the water inlet temperature acquisition unit can acquire the water inlet temperature of the water inlet pipe for a plurality of times in the execution process of the method, wherein the water inlet temperature comprises an initial water inlet temperature, an actual water inlet temperature and a latest actual water inlet temperature after the combustion is finished. The inlet water temperature acquisition unit comprises a temperature sensor arranged on the inlet water pipe.
The water outlet temperature acquisition unit is used for acquiring water outlet temperature, wherein the water outlet temperature comprises preset water outlet temperature and actual water outlet temperature of a water outlet pipe of the gas water heater; the water outlet temperature acquisition unit comprises an input module for acquiring the preset water outlet temperature and a temperature sensor which is arranged near the water outlet of the water heater and acquires the actual water outlet temperature.
The flow acquisition unit is used for acquiring an actual water flow value in the pipeline of the gas water heater; the device specifically comprises a flow sensor arranged in a water pipe.
And the current acquisition unit is used for acquiring the actual proportional valve current of the gas water heater.
The calculating unit is used for calculating the combustion load value of the gas water heater based on the outlet water temperature and the water flow value and determining the proportional valve current according to the combustion load value or obtaining the corresponding combustion load value according to the proportional valve current so as to obtain the measured inlet water temperature T j2. The calculation unit also comprises a table lookup database of combustion load values and proportional valve currents and a correction unit for correcting and measuring the water inlet temperature, wherein the correction unit is used for assigning a value to the difference between the actual water inlet temperatures measured on the front side and the rear side and correcting and measuring the water inlet temperature.
The first judging unit is configured to judge whether a difference Δt between the measured inlet water temperature T j2 and the actual inlet water temperature T j1 is within a preset threshold range Δts.
And the control unit is used for controlling the gas water heater to work under the corresponding proportional valve current. The control unit controls the gas water heater to work under the initial proportional valve current I 0 based on the preset water outlet temperature T c, the initial water inlet temperature T j0 and the initial water flow value q 0 at the beginning of combustion of the gas water heater at the beginning of the method. And controlling the water heater to work based on the actual inlet water temperature T j1 in the subsequent combustion or controlling the gas water heater to work based on the calculated inlet water temperature T j2 to replace the actual inlet water temperature T j1. The control unit can also comprise an adjusting unit for adjusting the proportional valve current of the gas water heater based on a constant temperature control algorithm of the gas water heater.
The water inlet temperature control device of the gas water heater further comprises a second judging unit, wherein the second judging unit is used for judging whether the time point before the start of the subsequent combustion and the time point when the difference value delta T between the water inlet temperature T j2 and the actual water inlet temperature T j1 is within a preset threshold range delta Ts or not are judged and calculated in the previous time, and whether the difference value delta T is within a second preset time period or not.
Example 4
Fig. 7 shows a schematic block diagram of an example electronic device 500 that may be used to implement an embodiment of the invention. The device 500 includes a computing unit 501 that can perform various appropriate actions and processes according to a computer program stored in a ROM (Read-Only Memory) 502 or a computer program loaded from a storage unit 508 into a RAM (Random Access Memory ) 503. In the RAM 503, various programs and data required for the operation of the device 500 can also be stored. The computing unit 501, ROM 502, and RAM 503 are connected to each other by a bus 504. An I/O (Input/Output) interface 505 is also connected to bus 504.
Various components in the device 500 are connected to the I/O interface 505, including: an input unit 506 such as a keyboard, a mouse, etc.; an output unit 507 such as various types of displays, speakers, and the like; a storage unit 508 such as a magnetic disk, an optical disk, or the like; and a communication unit 509 such as a network card, modem, wireless communication transceiver, etc. The communication unit 509 allows the device 500 to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.
The computing unit 501 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of computing unit 501 include, but are not limited to, a CPU (Central Processing Unit ), a GPU (Graphic Processing Units, graphics processing unit), various specialized AI (ARTIFICIAL INTELLIGENCE ) computing chips, various computing units running machine learning model algorithms, a DSP (DIGITAL SIGNAL Processor ), and any suitable Processor, controller, microcontroller, etc. The computing unit 501 performs the various methods and processes described above, such as the gas water heater inlet water temperature control method. For example, in some embodiments, the feedwater temperature control method may be implemented as a computer software program tangibly embodied on a machine readable medium, such as the storage unit 508. In some embodiments, part or all of the computer program may be loaded and/or installed onto the device 500 via the ROM 502 and/or the communication unit 509. When the computer program is loaded into RAM 503 and executed by computing unit 501, one or more steps of the method described above may be performed. Alternatively, in other embodiments, the computing unit 501 may be configured to perform the aforementioned gas water heater inlet water temperature control method by any other suitable means (e.g., by means of firmware).
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (8)
1. A method for controlling the inlet water temperature of a gas water heater is characterized by comprising the following steps: the method comprises the following steps:
Controlling the gas water heater to work until a water flow with stable temperature is output for a first preset time period t1;
Based on the actual outlet water temperature T c1, the actual water flow value q 1 and the actual proportional valve current I 1, obtaining a measured inlet water temperature T j2;
Judging the difference between the measured water inlet temperature T j2 and the actual water inlet temperature T j1 Whether or not it is within a preset threshold rangeAn inner part;
If yes, controlling the gas water heater to work still based on the actual water inlet temperature T j1 in the subsequent combustion, if the difference value Is within the preset threshold rangeIn the subsequent combustion, the measured water inlet temperature T j2 is used for replacing the actual water inlet temperature T j1 to control the gas water heater to work;
The obtaining the measured inlet water temperature T j2 based on the actual outlet water temperature T c1, the actual water flow value q 1 and the actual proportional valve current I 1 further comprises,
Based on the actual proportional valve current I 1, a corresponding actual combustion load value Q 1 is obtained, and the measured water inlet temperature T j2 is；
Wherein T j2 is the measured water inlet temperature,For an actual combustion load value corresponding to the actual proportional valve current I 1, q 1 is an actual water flow value;
The method comprises the steps that the gas water heater is controlled to work until a water flow with stable temperature is output for a first preset time period T1, specifically, a required initial combustion load value Q 0 is calculated based on a preset water outlet temperature T c, an initial water inlet temperature T j0 and an initial water flow value Q 0 at the beginning of combustion of the gas water heater, an initial proportional valve current I 0 is obtained according to the initial combustion load value Q 0, and the gas water heater is controlled to work under the initial proportional valve current I 0;
the method comprises the steps of controlling the gas water heater to work, and establishing a table look-up database between a combustion load value and a proportional valve current under a standard state before outputting a water flow with stable temperature for a first preset time period t 1.
2. The method for controlling the inlet water temperature of the gas water heater as claimed in claim 1, wherein: if the difference isIs within the preset threshold rangeAn outer part; then in the subsequent combustion, the measured and calculated water inlet temperature T j2 is used for replacing the actual water inlet temperature to control the gas water heater to work, and the specific steps are as follows:
After the combustion is finished, the latest actual water inlet temperature T j3 is obtained, and the difference value between the latest actual water inlet temperature T j3 and the actual water inlet temperature T j1 is obtained The method is used for correcting the measured inflow temperature T j2, and the corrected measured inflow temperature T j2 is used for replacing the actual inflow temperature in the subsequent combustion to control the gas water heater to work.
3. The method for controlling the inlet water temperature of the gas water heater as claimed in claim 2, wherein:
If the measured water inlet temperature T j2 is used for replacing the actual water inlet temperature T j1 in the subsequent combustion to control the gas water heater to work, the method further comprises the steps of determining the difference value between the measured water inlet temperature T j2 and the actual water inlet temperature T j1 with the previous judgment before the subsequent combustion Whether or not it is within a preset threshold rangeTime point difference inWhether the time is within a second preset time period or not, if so, continuing; if not, the difference between the measured and calculated water inlet temperature T j2 and the actual water inlet temperature T j1 is required to be judged againWhether or not it is within a preset threshold rangeAnd (3) inner part.
4. The water inlet temperature control device of the gas water heater is characterized by comprising
The water inlet temperature acquisition unit is used for acquiring the water inlet temperature in the water inlet pipe of the gas water heater;
the water outlet temperature acquisition unit is used for acquiring water outlet temperature, wherein the water outlet temperature comprises preset water outlet temperature and water outlet temperature of a water outlet pipe of the gas water heater;
The flow obtaining unit is used for obtaining the flow value in the pipeline of the gas water heater;
the current acquisition unit is used for acquiring the proportional valve current of the gas water heater;
The calculating unit is used for obtaining and calculating the water inlet temperature T j2 based on the water outlet temperature, the water flow value and the proportional valve current, or obtaining corresponding proportional valve current based on the water outlet temperature, the water inlet temperature and the water flow value;
the measured and calculated water inlet temperature T j2 is calculated by the formula The product can be obtained by the method,For an actual combustion load value corresponding to the actual proportional valve current I 1, q 1 is an actual water flow value and an actual water outlet temperature T c1;
a first judging unit for judging and measuring the difference between the water inlet temperature T j2 and the actual water inlet temperature T j1 Whether or not it is within a preset threshold rangeAn inner part;
the control unit is used for controlling the gas water heater to work under the corresponding proportional valve current;
The calculation unit also comprises a table look-up database of combustion load values and proportional valve currents.
5. The inlet water temperature control device of the gas water heater as claimed in claim 4, wherein: the calculation unit further comprises a correction unit for correcting and measuring the temperature of the inlet water.
6. The inlet water temperature control device of the gas water heater as claimed in claim 4, wherein: a second judging unit for judging the difference between the time point before the start of the subsequent combustion and the calculated water inlet temperature T j2 and the actual water inlet temperature T j1 Whether or not it is within a preset threshold rangeTime point difference inWhether within a second preset time period.
7. An electronic device, comprising:
at least one processor; and
A memory communicatively coupled to the at least one processor; wherein,
The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-3.
8. A non-transitory computer readable storage medium storing computer instructions for causing the computer to perform the method of any one of claims 1-3.
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| CN202310096940.4A CN115900089B (en) | 2023-01-19 | 2023-01-19 | Method and device for controlling water inlet temperature of gas water heater |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296386A (en) * | 2013-07-18 | 2015-01-21 | 海尔集团公司 | Control method and control system of gas water heater and gas water heater |
| CN111609560A (en) * | 2020-04-20 | 2020-09-01 | 芜湖美的厨卫电器制造有限公司 | Control method of gas water heater, gas water heater and computer readable storage medium |
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| CN114353334B (en) * | 2021-12-21 | 2023-08-04 | 广东万和热能科技有限公司 | Zero cold water gas water heater and control method, control device and storage medium thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296386A (en) * | 2013-07-18 | 2015-01-21 | 海尔集团公司 | Control method and control system of gas water heater and gas water heater |
| CN111609560A (en) * | 2020-04-20 | 2020-09-01 | 芜湖美的厨卫电器制造有限公司 | Control method of gas water heater, gas water heater and computer readable storage medium |
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