Control method and device of gas water heater, water heater and storage medium

Abstract

The invention relates to the technical field of hot water supply equipment, and discloses a control method and device of a gas water heater, the water heater and a storage medium The water inlet temperature, the water outlet temperature and the water flow of the gas water heater are obtained, and the current actual load corresponding to a proportional valve is determined based on the water inlet temperature, the water outlet temperature and the water flow; the current current of the proportional valve is obtained, and the current theoretical load corresponding to the proportional valve is determined based on the current current; based on the proportion of the difference value between the current theoretical load and the current actual load relative to the current theoretical load, the current load deviation rate of the gas water heater is determined; and adjusting the limiting current of the proportional valve based on the size relation of the current load deviation ratio relative to the preset deviation ratio. According to the method, the current working state of the gas water heater is determined based on the current load deviation rate, and the limiting current of the proportional valve is adjusted based on the current working state, so that the flame leaving phenomenon or flameout of the gas water heater is prevented, and the gas water heater can work stably.

Description

Technical Field

[0001] The present invention relates to the technical field of hot water supply equipment, and in particular to a control method and device for a gas water heater, a water heater and a storage medium. Background Art

[0002] A gas water heater is a gas appliance that uses gas as energy to prepare hot water through combustion and heating. During peak gas usage periods, the gas supply is prone to insufficient front pressure, and the gas water heater is prone to flame separation, resulting in excessive smoke. It is also prone to flameout, which makes it unusable, resulting in unstable working conditions and poor use effects. Summary of the invention

[0003] The first technical problem solved by the present invention is to provide a control method for a gas water heater, which effectively solves the problems of unstable working state and poor use effect of the gas water heater.

[0004] The second technical problem solved by the present invention is to provide a control device for a gas water heater, which effectively solves the problems of unstable working state and poor use effect of the gas water heater.

[0005] The third technical problem solved by the present invention is to provide a gas water heater, which effectively solves the problems of unstable working state and poor use effect of the gas water heater.

[0006] The fourth technical problem solved by the present invention is to provide a computer-readable storage medium, which effectively solves the problems of unstable working state and poor use effect of the gas water heater.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A control method for a gas water heater, the method comprising:

[0009] Obtain the inlet water temperature, outlet water temperature and water flow rate of the gas water heater, and determine the current actual load corresponding to the proportional valve based on the inlet water temperature, outlet water temperature and water flow rate;

[0010] Obtaining a current current of the proportional valve, and determining a current theoretical load corresponding to the proportional valve based on the current current;

[0011] Determine the current load deviation rate of the gas water heater based on the ratio of the difference between the current theoretical load and the current actual load relative to the current theoretical load;

[0012] Based on the magnitude relationship between the current load deviation rate and the preset deviation rate, the limiting current of the proportional valve is adjusted; the preset deviation rate corresponds to the working state of the gas water heater, and the working state includes an underpressure state and a back pressure state.

[0013] Compared with the background technology, the control method of the gas water heater of the present invention has the following beneficial effects: respectively calculating the current actual load and the current theoretical load of the proportional valve in the gas water heater, determining the current load deviation rate based on the ratio of the difference between the current theoretical load and the current actual load relative to the current theoretical load, determining the current working state of the gas water heater based on the current load deviation rate, that is, whether it is in an underpressure state or a backpressure state, and adjusting the limiting current of the proportional valve based on this to prevent the gas water heater from flameout or flameout, thereby enabling the gas water heater to work stably and improving the use effect of the gas water heater.

[0014] In one embodiment, the preset deviation rate includes a minimum load deviation rate and a maximum load deviation rate;

[0015] The minimum load deviation rate is obtained based on the difference between the undervoltage load deviation rate corresponding to the undervoltage state and the preset adjustment deviation rate;

[0016] The maximum load deviation rate is obtained based on the sum of the undervoltage load deviation rate corresponding to the undervoltage state and the preset adjustment deviation rate.

[0017] In one embodiment, based on the magnitude relationship between the current load deviation rate and the preset deviation rate, the limiting current of the proportional valve is adjusted, including:

[0018] If the current load deviation rate is greater than the maximum load deviation rate, the limiting current is reduced;

[0019] If the current load deviation rate is less than the minimum load deviation rate, the limiting current is increased.

[0020] In one embodiment, the preset deviation rate includes a back pressure load deviation rate corresponding to the back pressure state;

[0021] Based on the magnitude relationship between the current load deviation rate and the preset deviation rate, the limiting current of the proportional valve is adjusted, including:

[0022] If the current load deviation rate is less than or equal to the back pressure load deviation rate, the limiting current is adjusted to the maximum current of the proportional valve.

[0023] In one embodiment, the method further comprises:

[0024] If the current is greater than the limiting current, the current is adjusted to the limiting current;

[0025] Based on the current current, the fan speed information is queried to determine the target speed corresponding to the current current, and the fan speed is adjusted to the target speed; the fan speed information is used to characterize the corresponding relationship between the current of the proportional valve and the fan speed.

[0026] In one embodiment, determining the current actual load corresponding to the proportional valve based on the inlet water temperature, the outlet water temperature and the water flow rate includes:

[0027] The current actual load is determined based on the difference between the outlet water temperature and the inlet water temperature, as well as the water flow rate.

[0028] In one embodiment, determining a current theoretical load corresponding to the proportional valve based on the current current includes:

[0029] Based on the current current, the current theoretical load is determined by querying the theoretical load information; the theoretical load information is used to characterize the corresponding relationship between the current of the proportional valve and the theoretical load.

[0030] The above second technical problem is solved by the following technical solution:

[0031] A control device for a gas water heater, the device comprising:

[0032] The actual load determination module is used to obtain the inlet water temperature, outlet water temperature and water flow rate of the gas water heater, and determine the current actual load corresponding to the proportional valve based on the inlet water temperature, outlet water temperature and water flow rate;

[0033] Theoretical load determination module, used to obtain the current current of the proportional valve, and determine the current theoretical load corresponding to the proportional valve based on the current current;

[0034] A load deviation rate determination module, used to determine a current load deviation rate of the gas water heater based on a ratio of a difference between a current theoretical load and a current actual load relative to the current theoretical load;

[0035] The limiting current adjustment module is used to adjust the limiting current of the proportional valve based on the magnitude relationship between the current load deviation rate and the preset deviation rate; the preset deviation rate corresponds to the working state of the gas water heater, and the working state includes an underpressure state and a back pressure state.

[0036] The third technical problem mentioned above is solved by the following technical solution:

[0037] A gas water heater, comprising:

[0038] A first temperature sensor is used to detect the water inlet temperature of the gas water heater;

[0039] The second temperature sensor is used to detect the outlet water temperature of the gas water heater;

[0040] Flow sensor, used to detect water flow;

[0041] Proportional valve, used to adjust the ratio of gas and water flow;

[0042] And, a controller is used to execute any of the control methods for the gas water heater as described above.

[0043] The fourth technical problem mentioned above is solved by the following technical solution:

[0044] A computer-readable storage medium stores computer instructions, which are used to enable a computer to execute any of the above-mentioned control methods for a gas water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 is a flow chart of a control method for a gas water heater according to an embodiment of the present invention;

[0047] Figure 2 is a schematic diagram of the current actual load and the current theoretical load in an undervoltage state in a control method for a gas water heater according to an embodiment of the present invention;

[0048] Figure 3 is a structural schematic diagram of a control device for a gas water heater according to an embodiment of the present invention;

[0049] Figure 4 It is a structural schematic diagram of a gas water heater provided in an embodiment of the present invention.

[0050] Description of reference numerals:

[0051] 1. First temperature sensor; 2. Second temperature sensor; 3. Flow sensor; 4. Controller; 5. Water inlet pipe; 6. Water outlet pipe. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] As described in the background technology, the gas water heater is prone to flame separation or flameout in the under-pressure state, resulting in unstable working state of the gas water heater and poor use effect. At the same time, when the gas water heater returns to the back-pressure state from the under-pressure state, the proportional valve current of the gas water heater is too large, which will cause the outlet water temperature of the gas water heater to be too high, posing certain safety hazards.

[0056] Based on this, the present invention provides a control method for a gas water heater, which respectively calculates the current actual load and the current theoretical load of a proportional valve in the gas water heater, determines the current load deviation rate based on the ratio of the difference between the current theoretical load and the current actual load relative to the current theoretical load, determines the current working state of the gas water heater based on the current load deviation rate, that is, whether it is in an underpressure state or a backpressure state, and adjusts the limiting current of the proportional valve based on this to prevent the gas water heater from flameout or flameout, thereby enabling the gas water heater to work stably and improving the use effect of the gas water heater.

[0057] Combine the following Figures 1 to 4 , describing an embodiment of the present invention.

[0058] According to an embodiment of the present invention, in a first aspect, a control method for a gas water heater is provided. Figure 1 FIG. 1 is a flow chart of a control method for a gas water heater according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0059] Step 110: Obtain the inlet water temperature, outlet water temperature and water flow rate of the gas water heater, and determine the current actual load corresponding to the proportional valve based on the inlet water temperature, outlet water temperature and water flow rate.

[0060] In an embodiment of the present invention, the water inlet temperature of the gas water heater is detected by a first temperature sensor arranged on the water inlet pipe of the gas water heater, the water outlet temperature of the gas water heater is detected by a second temperature sensor arranged on the water outlet pipe of the gas water heater, and the water flow rate of the gas water heater is detected by a flow sensor arranged on the water inlet pipe of the gas water heater.

[0061] In the embodiment of the present invention, the proportional valve of the gas water heater is used to adjust the gas valve of the gas water heater to adjust the heat output to the water flow in the gas water heater, thereby adjusting the outlet water temperature of the gas water heater. The current actual load of the proportional valve refers to the heat of the heated water flow currently actually output by the proportional valve, that is, the heat required to heat the water in the gas water heater from the inlet water temperature to the outlet water temperature.

[0062] In the embodiment of the present invention, the heat corresponding to the outlet water temperature is subtracted from the heat corresponding to the inlet water temperature to obtain the heat required to heat the water flow from the inlet water temperature to the outlet water temperature, that is, the current actual load of the proportional valve is obtained.

[0063] In one embodiment, the heat corresponding to the outlet water temperature is equal to the product of the outlet water temperature and the water flow rate, and the heat corresponding to the inlet water temperature is equal to the product of the inlet water temperature and the water flow rate. Then, the current actual load can be determined based on the difference between the outlet water temperature and the inlet water temperature, and the water flow rate. Specifically, the current actual load of the proportional valve can be calculated using the following formula (1):

[0064] Q1=(T2-T1)*L formula (1)

[0065] Among them, Q1 is the current actual load, T1 is the inlet water temperature, T2 is the outlet water temperature, and L is the water flow rate.

[0066] Step 120: Acquire the current current of the proportional valve, and determine the current theoretical load corresponding to the proportional valve based on the current current.

[0067] In the embodiment of the present invention, the current of the proportional valve determines the opening of the gas valve, thereby determining the amount of heat that the gas water heater can provide to the water flow. The current theoretical load of the proportional valve refers to the amount of heat that the gas water heater can theoretically output according to the current current of the proportional valve, that is, according to the current opening of the gas valve.

[0068] In the embodiment of the present invention, the current current of the proportional valve is obtained, and the current theoretical load corresponding to the proportional valve is determined according to the current current of the proportional valve. The corresponding relationship between the current of the proportional valve and the theoretical load can be obtained by fitting the relevant data of the current and load of the proportional valve under the standard pressure condition collected in advance, and the theoretical load corresponding to the current current can be determined according to the corresponding relationship, that is, the current theoretical load is obtained.

[0069] In one embodiment, the corresponding relationship between the current and the theoretical load of the proportional valve can be characterized by theoretical load information; wherein the theoretical load information can be quantified in a table, a fitting curve, a function, etc., and no specific limitation is made here. Based on the current current, the theoretical load information is queried to obtain the theoretical load corresponding to the current current, which is the current theoretical load.

[0070] Step 130: Determine the current load deviation rate of the gas water heater based on the ratio of the difference between the current theoretical load and the current actual load relative to the current theoretical load.

[0071] In the embodiment of the present invention, Figure 2 Schematic diagram of the current actual load and the current theoretical load in the undervoltage state in the control method of the gas water heater according to the embodiment of the present invention. Figure 2 As shown, when in an undervoltage state, there will be a deviation between the current actual load and the current theoretical load. When the opening of the gas valve corresponding to the current current does not reach the maximum pressure of the gas, due to some losses in the heat transfer process, the current actual load is slightly less than the current theoretical load. When the opening of the gas valve corresponding to the current current reaches the current maximum pressure of the gas, even if the current of the proportional valve is increased to increase the opening of the gas valve, the gas that can be supplied by the gas water heater will not increase, so the current actual load will not increase with the increase of the current current; at the same time, with the increase of the current current, the fan speed of the gas water heater increases, resulting in flame separation, which in turn causes the current actual load to decrease.

[0072] In the embodiment of the present invention, when in the back pressure state, due to some losses in the heat transmission process, the current actual load is slightly less than the current theoretical load; at the same time, as the current current increases, the opening of the gas valve increases accordingly, the gas that can be supplied by the gas water heater increases, and the current actual load increases with the increase of the current current. Then, when in the back pressure state, the current actual load is basically consistent with the current theoretical load, and maintains the same change relationship with the current current.

[0073] In the embodiment of the present invention, the current load deviation rate of the gas water heater is determined based on the ratio of the difference between the current theoretical load and the current actual load to the current theoretical load. The current load deviation rate of the gas water heater can be calculated using the following formula (2):

[0074] A=(Q1-Q2) / Q2 Formula (2)

[0075] Among them, A is the current load deviation rate, Q1 is the current actual load, and Q2 is the current theoretical load.

[0076] In the embodiment of the present invention, when the gas water heater is in a back pressure state, the current load deviation rate is always relatively small. When the gas water heater is in an underpressure state, when the opening of the gas valve corresponding to the current current does not reach the maximum pressure of the gas, the current load deviation rate is relatively small; when the opening of the gas valve corresponding to the current current reaches the maximum pressure of the gas, as the current current increases, the current load deviation rate also gradually increases. Therefore, the current load deviation rate can be used to determine the current working state of the gas water heater, and further based on this, to guide the adjustment and limitation of the current of the proportional valve.

[0077] Step 140: Based on the magnitude relationship between the current load deviation rate and the preset deviation rate, the limiting current of the proportional valve is adjusted.

[0078] In the embodiment of the present invention, the preset deviation rate corresponds to the working state of the gas water heater, wherein the working state includes an underpressure state and a backpressure state. The preset deviation rate is used to limit the deviation rate ranges corresponding to the underpressure state and the backpressure state, respectively, so that the current working state of the gas water heater can be determined according to the magnitude relationship between the current load deviation rate and the preset deviation rate.

[0079] In the embodiment of the present invention, the limiting current of the proportional valve is used to limit the maximum current of the proportional valve, that is, the current current of the proportional valve will not exceed the limiting current. According to the current working state of the gas water heater, the limiting current of the proportional valve is adjusted to limit the maximum value of the current current of the proportional valve, avoiding the flame-off phenomenon or the excessively high water outlet temperature caused by the current current being too large, so that the gas water heater can work stably.

[0080] In one embodiment, the preset deviation rate includes a minimum load deviation rate and a maximum load deviation rate. The minimum load deviation rate is obtained based on the difference between the undervoltage load deviation rate corresponding to the undervoltage state and the preset adjustment deviation rate, and the maximum load deviation rate is obtained based on the sum of the undervoltage load deviation rate corresponding to the undervoltage state and the preset adjustment deviation rate. The values ​​of the undervoltage load deviation rate and the preset adjustment deviation rate are related to the type or model of the corresponding gas water heater.

[0081] In one embodiment, the undervoltage load deviation rate is a load deviation rate at which the gas water heater can work normally under undervoltage conditions without flame-out or flameout. The preset adjustment deviation rate is used to limit a deviation rate range near the undervoltage load deviation rate, that is, the deviation rate range between the minimum load deviation rate and the maximum load deviation rate, to avoid using the undervoltage load deviation rate as an adjustment reference, resulting in repeated adjustments to the limiting current and the current current, causing fluctuations in the outlet water temperature; within this deviation rate range, the gas water heater can work normally even under undervoltage conditions, and beyond this deviation rate range, the gas water heater is at risk of flame-out or flameout.

[0082] In one embodiment, in order to ensure that the gas water heater can work stably under an underpressure state, it is necessary to control the current load deviation rate of the gas water heater between the minimum load deviation rate and the maximum load deviation rate. On the one hand, the minimum value of the current actual load is limited by the minimum load deviation rate to avoid flameout due to the current actual load being too small. On the other hand, the maximum value of the current actual load is limited by the maximum load deviation rate, thereby limiting the current current by limiting the current, avoiding flameout under an underpressure state, and avoiding excessive current actual load and causing excessive water outlet temperature when the underpressure state is restored to the back-pressure state.

[0083] Specifically, if the current load deviation rate is greater than the maximum load deviation rate, it indicates that the current current is too large. At this time, the limiting current is reduced to adjust the current current downward, so as to adjust the current load deviation rate to less than or equal to the maximum load deviation rate; if the current load deviation rate is less than the minimum load deviation rate, it indicates that the current current is too small. At this time, the limiting current is increased to adjust the current current upward, so as to adjust the current load deviation rate to greater than or equal to the minimum load deviation rate.

[0084] In one embodiment, the preset deviation rate includes a back-pressure load deviation rate corresponding to the back-pressure state, and the back-pressure load deviation rate is less than the under-pressure load deviation rate. In the under-pressure state, the current current needs to be limited to ensure that the gas water heater can work normally; while in the back-pressure state, the gas can be supplied normally, so the gas water heater can work normally, and then it is no longer necessary to limit the current current by limiting the current. Therefore, if the current load deviation rate is less than or equal to the back-pressure load deviation rate, that is, when the gas water heater is in the back-pressure state, the limiting current is adjusted to the maximum current of the proportional valve, thereby releasing the limitation on the current current.

[0085] In one embodiment, after the limiting current is adjusted in the above step 140, if the current current is greater than the limiting current, the current current is adjusted to the limiting current to limit the current current, thereby ensuring that the current load deviation rate is between the minimum load deviation rate and the maximum load deviation rate, thereby ensuring that the gas water heater can operate stably under an undervoltage state.

[0086] In one embodiment, since there is a certain correlation between the fan speed of the gas water heater and the current of the proportional valve, specifically a proportional relationship, when the current current is adjusted, the fan speed will also be adjusted synchronously. Specifically, based on the current current, the fan speed information is queried to determine the target speed corresponding to the current current, and the fan speed is adjusted to the target speed; wherein the fan speed information is used to characterize the correspondence between the current of the proportional valve and the fan speed, that is, the proportional relationship between the current of the proportional valve and the fan speed. At the same time, since the current limit limits the maximum value that the current current can be adjusted to, the maximum value of the fan speed is also limited, thereby avoiding the flame-off phenomenon caused by the excessive speed of the fan in the under-pressure state, thereby ensuring that the gas water heater can work stably in the under-pressure state.

[0087] The control method for a gas water heater provided in an embodiment of the present invention respectively calculates the current actual load and the current theoretical load of a proportional valve in the gas water heater, determines the current load deviation rate based on the ratio of the difference between the current theoretical load and the current actual load relative to the current theoretical load, determines the current working state of the gas water heater based on the current load deviation rate, that is, whether it is in an underpressure state or a backpressure state, and adjusts the limiting current of the proportional valve based on this to prevent the gas water heater from flameout or flameout, thereby enabling the gas water heater to work stably and improving the use effect of the gas water heater.

[0088] According to an embodiment of the present invention, in a second aspect, a control device for a gas water heater is also provided. Figure 3 is a schematic diagram of the structure of a control device for a gas water heater according to an embodiment of the present invention. Figure 3 As shown, the device comprises:

[0089] The actual load determination module 310 is used to obtain the inlet water temperature, outlet water temperature and water flow rate of the gas water heater, and determine the current actual load corresponding to the proportional valve based on the inlet water temperature, outlet water temperature and water flow rate;

[0090] Theoretical load determination module 320, used to obtain the current current of the proportional valve, and determine the current theoretical load corresponding to the proportional valve based on the current current;

[0091] A load deviation rate determination module 330, for determining a current load deviation rate of the gas water heater based on a ratio of a difference between a current theoretical load and a current actual load relative to the current theoretical load;

[0092] The limiting current adjustment module 340 is used to adjust the limiting current of the proportional valve based on the magnitude relationship between the current load deviation rate and the preset deviation rate; the preset deviation rate corresponds to the working state of the gas water heater, and the working state includes an underpressure state and a back pressure state.

[0093] In one embodiment, the preset deviation rate includes a minimum load deviation rate and a maximum load deviation rate;

[0094] The minimum load deviation rate is obtained based on the difference between the undervoltage load deviation rate corresponding to the undervoltage state and the preset adjustment deviation rate;

[0095] The maximum load deviation rate is obtained based on the sum of the undervoltage load deviation rate corresponding to the undervoltage state and the preset adjustment deviation rate.

[0096] In one embodiment, the limiting current adjustment module 340 includes:

[0097] A limiting current reduction unit, used to reduce the limiting current if the current load deviation rate is greater than the maximum load deviation rate;

[0098] The limiting current increasing unit is used to increase the limiting current if the current load deviation rate is less than the minimum load deviation rate.

[0099] In one embodiment, the preset deviation rate includes a back pressure load deviation rate corresponding to the back pressure state;

[0100] The current limiting adjustment module 340 includes:

[0101] The maximum current setting unit is used to adjust the limiting current to the maximum current of the proportional valve if the current load deviation rate is less than or equal to the back pressure load deviation rate.

[0102] In one embodiment, the apparatus further comprises:

[0103] A current regulating module, used for regulating the current to the limiting current if the current is greater than the limiting current;

[0104] The fan speed adjustment module is used to query the fan speed information based on the current current, determine the target speed corresponding to the current current, and adjust the fan speed to the target speed; the fan speed information is used to characterize the corresponding relationship between the current of the proportional valve and the speed of the fan.

[0105] In one embodiment, the actual load determination module 310 is used to:

[0106] The current actual load is determined based on the difference between the outlet water temperature and the inlet water temperature, as well as the water flow rate.

[0107] In one embodiment, the theoretical load determination module 320 is used to:

[0108] Based on the current current, the current theoretical load is determined by querying the theoretical load information; the theoretical load information is used to characterize the corresponding relationship between the current of the proportional valve and the theoretical load.

[0109] According to a third aspect of an embodiment of the present invention, a gas water heater is also provided. Figure 4 is a schematic diagram of the structure of a gas water heater provided by an embodiment of the present invention. Figure 4 As shown, the gas water heater includes: a first temperature sensor 1, used to detect the water inlet temperature of the gas water heater; a second temperature sensor 2, used to detect the water outlet temperature of the gas water heater; a flow sensor 3, used to detect the water flow; a proportional valve, used to adjust the ratio of gas and water flow; and a controller 4, used to execute the control method of the gas water heater as described in the first aspect above.

[0110] In one embodiment, the first temperature sensor 1 is arranged on the water inlet pipe 5 of the gas water heater, and detects the water temperature in the water inlet pipe 5 to obtain the water inlet temperature. The second temperature sensor 2 is arranged on the water outlet pipe 6 of the gas water heater, and detects the water temperature in the water outlet pipe 6 to obtain the water outlet temperature. The flow sensor 3 is arranged on the water inlet pipe 5, and detects the flow in the water inlet pipe 5 to obtain the water flow.

[0111] According to an embodiment of the present invention, in a fourth aspect, a computer-readable storage medium is further provided, on which computer instructions are stored, and the computer instructions are used to enable a computer to execute the control method of the gas water heater as described in the first aspect above.

[0112] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The specific contents of the above specific implementations only express several implementations of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A control method for a gas water heater, characterized in that: The method comprises: Obtaining the inlet water temperature, outlet water temperature and water flow rate of the gas water heater, and determining the current actual load corresponding to the proportional valve based on the inlet water temperature, outlet water temperature and water flow rate; Acquiring a current current of the proportional valve, and determining a current theoretical load corresponding to the proportional valve based on the current current; Determining a current load deviation rate of the gas water heater based on a ratio of a difference between the current theoretical load and the current actual load relative to the current theoretical load; Based on the magnitude relationship between the current load deviation rate and the preset deviation rate, the limiting current of the proportional valve is adjusted; the preset deviation rate corresponds to the working state of the gas water heater, and the working state includes an underpressure state and a back pressure state.

2. The method according to claim 1, characterized in that The preset deviation rate includes a minimum load deviation rate and a maximum load deviation rate; The minimum load deviation rate is obtained based on the difference between the undervoltage load deviation rate corresponding to the undervoltage state and the preset adjustment deviation rate; The maximum load deviation rate is obtained based on the sum of the undervoltage load deviation rate corresponding to the undervoltage state and the preset adjustment deviation rate.

3. The method according to claim 2, characterized in that The adjusting the limiting current of the proportional valve based on the magnitude relationship between the current load deviation rate and the preset deviation rate includes: If the current load deviation rate is greater than the maximum load deviation rate, reducing the limiting current; If the current load deviation rate is less than the minimum load deviation rate, the limiting current is increased.

4. The method according to claim 1, characterized in that The preset deviation rate includes a back pressure load deviation rate corresponding to the back pressure state; The adjusting the limiting current of the proportional valve based on the magnitude relationship between the current load deviation rate and the preset deviation rate includes: If the current load deviation rate is less than or equal to the back pressure load deviation rate, the limiting current is adjusted to the maximum current of the proportional valve.

5. The method according to claim 1, characterized in that The method further comprises: If the current current is greater than the limiting current, adjusting the current current to the limiting current; Based on the current current, the fan speed information is queried to determine the target speed corresponding to the current current, and the fan speed is adjusted to the target speed; the fan speed information is used to characterize the correspondence between the current of the proportional valve and the fan speed.

6. The method according to claim 1, characterized in that The determining the current actual load corresponding to the proportional valve based on the water inlet temperature, the water outlet temperature and the water flow rate includes: The current actual load is determined based on the difference between the outlet water temperature and the inlet water temperature, and the water flow rate.

7. The method according to claim 1, characterized in that The determining the current theoretical load corresponding to the proportional valve based on the current current includes: Based on the current current, the current theoretical load is determined by searching in the theoretical load information; the theoretical load information is used to characterize the corresponding relationship between the current of the proportional valve and the theoretical load.

8. A control device for a gas water heater, characterized in that: The device comprises: The actual load determination module is used to obtain the inlet water temperature, outlet water temperature and water flow rate of the gas water heater, and determine the current actual load corresponding to the proportional valve based on the inlet water temperature, outlet water temperature and water flow rate; a theoretical load determination module, used to obtain a current current of the proportional valve, and determine a current theoretical load corresponding to the proportional valve based on the current current; A load deviation rate determination module, configured to determine a current load deviation rate of the gas water heater based on a ratio of a difference between the current theoretical load and the current actual load relative to the current theoretical load; The limiting current adjustment module is used to adjust the limiting current of the proportional valve based on the magnitude relationship between the current load deviation rate and the preset deviation rate; the preset deviation rate corresponds to the working state of the gas water heater, and the working state includes an underpressure state and a back pressure state.

9. A gas water heater, characterized in that: The gas water heater comprises: A first temperature sensor, used to detect the water inlet temperature of the gas water heater; A second temperature sensor, used to detect the outlet water temperature of the gas water heater; Flow sensor, used to detect water flow; A proportional valve, used to adjust the ratio of the gas flow and the water flow; And, a controller is used to execute the control method of the gas water heater as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the control method of the gas water heater according to any one of claims 1 to 7.

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