Gas water heater control method and device, gas water heater, and storage medium

Abstract

The present invention discloses a gas water heater control method and device, a gas water heater, and a storage medium. The method includes: calculating the required heat value of the gas water heater when the temperature difference between the actual water outlet temperature of the gas water heater and the set water outlet temperature is adjusted to be less than the temperature difference threshold; determining the initial firepower gear that matches the required heat value; judging whether the combustion firepower of the initial firepower gear falls within the preset firepower range when the temperature difference is adjusted at the initial firepower gear; and if the judgment result is no, controlling the gas water heater to operate at the adjacent firepower gear of the initial firepower gear. The present invention realizes a gas water heater control method, so that the noise during the operation of the water heater becomes smaller, the efficiency becomes higher, and efficient and low-noise combustion control is realized.

Description

Technical Field

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

[0002] The existing water heater burner can only burn when the gas fire grate is connected, so the combustion power level can be adjusted. The three-stage burner is more commonly used in the existing water heaters on the market. Generally, in order to prevent the water heater from frequently switching the position of the power level between two power levels due to the fluctuation of the heat demand value caused by the fluctuation of the water flow during combustion, a certain area of ​​the required heat value overlaps between each power level. The water heater power level control logic refers to the judgment that after a certain power level can match the required heat value, the combustion is carried out at the current combustion power level to prevent the power level from switching. This control logic may cause the combustion to cover the maximum and minimum of the current power level. In order to ensure sufficient combustion and stable flame, the maximum and minimum fan speeds are generally linearly matched with the maximum and minimum current firepower levels, and the flame height and fan speed corresponding to the maximum point of each firepower level are both maximum, so there are points with relatively high noise near the maximum point of each firepower level; and due to the high wind speed and fast air flow rate, the heat exchange time between the high-temperature gas generated by combustion and the heat exchanger is short, and the heat exchange is insufficient, so the relative thermal efficiency is also relatively low. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the water heater in the prior art in that the water heater has high noise and low thermal efficiency during operation, and to provide a gas water heater control method and device, a gas water heater, and a storage medium.

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

[0005] In a first aspect, a gas water heater control method is provided, comprising:

[0006] Calculating the required calorific value of the gas water heater when the temperature difference between the actual outlet water temperature of the gas water heater and the set outlet water temperature is adjusted to be less than the temperature difference threshold;

[0007] Determining an initial firepower level that matches the required calorific value;

[0008] Determining whether the combustion firepower of the initial firepower level falls within a preset firepower range when the temperature difference is adjusted at the initial firepower level;

[0009] When the judgment result is no, the gas water heater is controlled to operate at a fire power level adjacent to the initial fire power level.

[0010] Optionally, controlling the gas water heater to operate at a fire power level adjacent to the initial fire power level includes:

[0011] When the combustion firepower is less than the lower limit of the preset firepower range, the gas water heater is controlled to operate at the next firepower level of the initial firepower level; the lower limit of the combustion firepower of the next firepower level is less than the lower limit of the combustion firepower of the initial firepower level;

[0012] When the combustion firepower is greater than the upper limit value of the preset firepower range, the gas water heater is controlled to operate at the previous firepower level of the initial firepower level; the upper limit value of the combustion firepower of the previous firepower level is greater than the upper limit value of the combustion firepower of the initial firepower level.

[0013] Optionally, the combustion firepower is characterized by at least one parameter of the fan speed, gas flow rate and air flow rate of the gas water heater;

[0014] Determining whether the combustion firepower of the initial firepower level falls within a preset firepower range includes:

[0015] Determine whether the parameter value of each parameter falls within the respective parameter value range.

[0016] Optionally, the gas water heater control method further includes:

[0017] When the judgment result is yes, the gas water heater is controlled to operate at the initial fire power level.

[0018] Optionally, before the step of judging whether the combustion firepower of the initial firepower level falls within a preset firepower range when adjusting the temperature difference at the initial firepower level, the method further comprises:

[0019] Determine whether the gas water heater is in high efficiency and low noise mode;

[0020] If the high efficiency and low noise mode is not turned on, controlling the gas water heater to operate at the initial fire power level;

[0021] If the high efficiency and low noise mode is turned on, a step is performed to determine whether the combustion firepower of the initial firepower level falls within a preset firepower range when the temperature difference is adjusted with the initial firepower level.

[0022] In a second aspect, a gas water heater control device is provided, comprising:

[0023] A calculation module, used for calculating the required heat value of the gas water heater when the temperature difference between the actual outlet water temperature of the gas water heater and the set outlet water temperature is adjusted to be less than the temperature difference threshold;

[0024] A determination module, used to determine an initial firepower level that matches the required calorific value;

[0025] A first judgment module is used to judge whether the combustion firepower of the initial firepower level falls within a preset firepower range when the temperature difference is adjusted at the initial firepower level;

[0026] The control module is used to control the gas water heater to operate at a fire power level adjacent to the initial fire power level when the judgment result is no.

[0027] Optionally, the control module is specifically used for:

[0028] When the combustion firepower is less than the lower limit of the preset firepower range, the gas water heater is controlled to operate at the next firepower level of the initial firepower level; the lower limit of the combustion firepower of the next firepower level is less than the lower limit of the combustion firepower of the initial firepower level;

[0029] When the combustion firepower is greater than the upper limit value of the preset firepower range, the gas water heater is controlled to operate at the previous firepower level of the initial firepower level; the upper limit value of the combustion firepower of the previous firepower level is greater than the upper limit value of the combustion firepower of the initial firepower level.

[0030] Optionally, the combustion firepower is characterized by at least one parameter of the fan speed, gas flow rate and air flow rate of the gas water heater;

[0031] The first judgment module is specifically used to judge whether the parameter value of each parameter falls within the respective parameter value range.

[0032] Optionally, the control module is further configured to control the gas water heater to operate at the initial fire power level if the judgment result is yes.

[0033] Optionally, the gas water heater control device further includes:

[0034] The second judgment module is used to judge whether the gas water heater is turned on the high-efficiency and low-noise mode;

[0035] If the high efficiency and low noise mode is not turned on, calling the control module to control the gas water heater to operate at the initial fire power level;

[0036] If the high-efficiency and low-noise mode is turned on, the first judgment module is called.

[0037] In a third aspect, a gas water heater is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the above-mentioned gas water heater control methods when executing the computer program.

[0038] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, any of the above-mentioned gas water heater control methods is implemented.

[0039] The positive progressive effects of the present invention are: while ensuring that the water outlet temperature basically meets the requirements, the noise during the operation of the water heater is reduced and the efficiency is higher; the water heater can be made to avoid high wind speed, high noise, and low efficiency firepower levels as much as possible to perform combustion at the maximum level, thereby achieving efficient and low noise combustion control. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A flow chart of a gas water heater control method provided by an exemplary embodiment of the present invention;

[0041] Figure 2 A schematic diagram of a module of a gas water heater control device provided by an exemplary embodiment of the present invention;

[0042] Figure 3 A schematic structural diagram of a gas water heater provided by an exemplary embodiment of the present invention;

[0043] Figure 4A A schematic diagram of the range of gears of a prior art gas water heater provided by an exemplary embodiment of the present invention;

[0044] Figure 4B A schematic diagram of the range of gears of a gas water heater of the present invention provided by an exemplary embodiment of the present invention;

[0045] Figure 4C A flow chart of another gas water heater control method provided by an exemplary embodiment of the present invention;

[0046] Figure 5 A schematic structural diagram of another gas water heater provided by an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0047] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0048] This embodiment provides a gas water heater control method, such as Figure 1 As shown, the method comprises the following steps:

[0049] A schematic diagram of the structure of a gas water heater provided in this embodiment is as follows: Figure 3As shown, the gas water heater includes a gas proportional valve 31, a water inlet temperature sensor 32, a water flow sensor 33, a segmented pipe 34, an electric controller assembly 35, a heat exchanger 36, a burner 37, a fan 38, and a water outlet temperature sensor 39. The burner 37 includes a housing and a plurality of fire bars arranged in parallel, which are used to heat the incoming water. The inlet of each fire bar corresponds to a segmented pipe nozzle, and the opening and closing of the solenoid valve on the segmented pipe can select which fire bars to connect to the gas. Only the fire bars connected to the gas can burn, thereby adjusting the fire power level.

[0050] At present, the gas water heater used in the water heater control method has at least two burners, and the gas water heater can also be operated at different firepower levels, taking a three-level burner as an example. Figure 4A As shown, the first fire gear is burned with 4 fire bars, and its combustion fire power range is Q1-Q2, the second fire gear is burned with 7 fire bars, and its combustion fire power range is Q3-Q4, and the third fire gear is burned with all 11 fire bars, and its combustion fire power range is Q5-Q6. In order to prevent the water heater from frequently switching between two gears when the heat demand value fluctuates due to water flow fluctuations during combustion, the main water heaters currently leave a certain area of ​​calorie value overlap interval between each gear, that is, the overlap interval between the first and second gears is Q2-Q3, and the overlap interval between the second and third gears is Q4-Q5.

[0051] For example, the gas water heater of the present invention, the gas water heater used in the gas water heater control method also has at least two burners, and the gas water heater can also be operated at different firepower levels. For example, a three-level burner, such as Figure 4B As shown, the first fire power level is burned with 4 fire bars, and its combustion fire power range is Q1-Q3; the second fire power level is burned with 7 fire bars, and its combustion fire power range is Q3-Q5; the third fire power level is burned with all 11 fire bars, and its combustion fire power range is Q5-Q6. When burning at each fire power level, the water heater can also adjust at least one of the gas flow, fan speed and air flow rate through the gas proportional valve, thereby changing the flame size of the current fire power level and adjusting the heat output value.

[0052] Step 101: Calculate the required heat value of the gas water heater when the temperature difference between the actual outlet water temperature of the gas water heater and the set outlet water temperature is adjusted to be less than the temperature difference threshold.

[0053] The actual outlet water temperature can be detected by a temperature sensor at the outlet of the gas water heater; the outlet water temperature can be set according to the actual needs of the user.

[0054] The temperature difference threshold can be set according to actual needs. It refers to a range of the temperature difference between the actual water outlet temperature and the set water outlet temperature. The actual water outlet temperature within this range can meet the set water outlet temperature.

[0055] The calculation formula for the required heat value can be but is not limited to Q=q*(t2-t1), where Q represents the required heat value, q represents the water flow rate, t1 represents the actual water inlet temperature, t2 represents the set water outlet temperature, and t3 represents the actual water outlet temperature.

[0056] Step 102: Determine an initial firepower level that matches the required calorific value.

[0057] When designing a gas water heater, the required calorific value for each fire level will be calibrated and recorded in the control program. The required calorific value for the set water outlet temperature is compared with the required calorific value for each fire level of the gas water heater, the corresponding fire level is selected, and the fire level is set as the initial fire level.

[0058] Step 103: Determine whether the combustion firepower of the initial firepower level falls within a preset firepower range when adjusting the temperature difference with the initial firepower level.

[0059] The preset firepower range can be set according to actual conditions. When the combustion firepower falls within the preset firepower range, it means that the noise volume of the gas water heater is less than the noise volume threshold, that is, the noise volume is small; the thermal efficiency is higher than the efficiency threshold, that is, the thermal efficiency is high.

[0060] Select the initial firepower level, and then adjust the combustion power at the initial firepower level to try to make the water outlet temperature equal to the set temperature.

[0061] The temperature difference threshold is compared with the temperature difference between the actual water outlet temperature of the gas water heater and the set water outlet temperature to determine whether the temperature difference is within the temperature difference threshold range, thereby determining whether the combustion firepower of the initial firepower level falls within the preset firepower range.

[0062] Step 104: When the judgment result is no, control the gas water heater to operate at a fire power level adjacent to the initial fire power level.

[0063] If the judgment result of step 103 is no, it means that if the gas water heater is operated at the calculated initial fire power level, the noise will be large and the thermal efficiency will be low. The calculated initial fire power level is not suitable and needs to be optimized, so step 104 is executed.

[0064] In one embodiment, if the judgment result of step 103 is yes, the gas water heater is directly controlled to operate at the initial fire power level.

[0065] The embodiments of the present invention can reduce the noise of the water heater during operation and increase its efficiency.

[0066] In one embodiment, if the combustion firepower does not fall within the preset firepower range, if it is at the lower limit value of the preset firepower range, the gas water heater is controlled to operate at the next firepower level of the initial firepower level; the lower limit value of the combustion firepower of the next firepower level is less than the lower limit value of the combustion firepower of the initial firepower level; if it is at the upper limit value of the preset firepower range, the gas water heater is controlled to operate at the previous firepower level of the initial firepower level; the upper limit value of the combustion firepower of the previous firepower level is greater than the upper limit value of the combustion firepower of the initial firepower level.

[0067] The embodiments of the present invention can make the operations between gears more clear, thus facilitating the gear operation of combustion firepower.

[0068] In one embodiment, when a user needs hot water, it is necessary to first determine whether the user has set a high-efficiency and low-noise mode. If not, the gas water heater is controlled to operate at the initial firepower level.

[0069] Calculate the required heat value of the gas water heater when the temperature difference between the actual water outlet temperature of the gas water heater and the set water outlet temperature is adjusted to be less than the temperature difference threshold; the control logic of the water heater's fire level must first determine the required heat value that can be matched at a certain fire level, and try to determine that combustion is carried out at the initial fire level to prevent the fire level from switching.

[0070] Through the embodiments of the present invention, users can choose whether to set the high-efficiency and low-noise mode, which increases the initiative of users. If the water volume in the user's home is relatively stable and is not prone to frequent cut-off problems, and if there are requirements for noise and efficiency, the high-efficiency and low-noise mode can be selected.

[0071] The combustion power is characterized by at least one parameter of the gas water heater's fan speed, gas flow rate, and air flow rate; if the wind speed is high and the air flow rate is fast, it will lead to high-temperature gas produced by combustion. Whether the combustion power of the initial power level falls within the preset power range can be determined by judging whether the parameter values ​​of the fan speed, gas flow rate, and air flow rate fall within their respective parameter value ranges.

[0072] In one embodiment, when adjusting the temperature difference with the initial fire power level, if the combustion fire power falls within the preset fire power range, it means that the initial fire power level is more suitable, and the gas water heater is controlled to operate with the initial fire power level, so that the water heater burns at the small and medium points of each fire power level as much as possible. When the combustion fire power falls within the preset fire power range, the noise level of the gas water heater is less than the noise level threshold, that is, the noise level is small; the thermal efficiency is higher than the efficiency threshold, that is, the thermal efficiency is high.

[0073] If the combustion firepower does not fall within the preset firepower range, it means that the initial firepower level is inappropriate, and the gas water heater is controlled to operate at a firepower level adjacent to the initial firepower level.

[0074] For example, see Figure 4A Assuming that the initial firepower level that matches the required heat value is the first firepower level, when adjusting the temperature difference at the first firepower level, the estimated combustion firepower of the initial firepower level is Q', Q' does not fall into the preset firepower range Q1-Q3 of the first firepower level, and the same heat output Q' is generally 2-5 percentage points lower in efficiency at the first high firepower level than at the second low firepower level. Therefore, the gas water heater is controlled to operate at the second firepower level (the adjacent firepower level of the first firepower level).

[0075] By implementing the gas water heater control method, the water heater can produce less noise and higher efficiency during operation while ensuring that the outlet water temperature basically meets the requirements; the water heater can be made to avoid high wind speed, high noise, and low efficiency firepower levels as much as possible to achieve maximum combustion, thereby achieving high-efficiency and low-noise combustion control.

[0076] Combine the following Figure 4C , further limiting the control process of the gas water heater provided in the embodiment of the present invention.

[0077] S1. The user turns on the faucet and chooses whether to turn on the high-efficiency and low-noise mode.

[0078] If not, the water heater is controlled according to the general gear control logic; if so, S2 is executed.

[0079] The so-called general gear control logic refers to the control logic that operates according to the initial firepower gear.

[0080] S2. Obtain the actual water inlet temperature t1, water flow rate q, set water outlet temperature t2 and actual water outlet temperature t3.

[0081] S3. Calculate the required heat value Q = q*(t2-t1).

[0082] S4. Determine an initial firepower level that matches the required calorific value.

[0083] Step S4 specifically includes: judging whether Q is less than Q3, if Q is less than Q3, burning in the first gear; if Q is not less than Q3, judging whether Q is less than Q5, if Q is less than Q5, burning in the second gear; if Q is not less than Q5, burning in the third gear. The combustion firepower range of the first gear is Q1-Q3, the combustion firepower range of the second gear is Q3-Q5, and the combustion firepower range of the third gear is Q5-Q6.

[0084] S5. Adjust the combustion power at the initial firepower level so that the actual outlet water temperature reaches the set outlet water temperature.

[0085] S6. Determine whether the set water outlet temperature is equal to the actual water outlet temperature.

[0086] If the set water outlet temperature is equal to the actual water outlet temperature, the initial firepower is maintained; if the set water outlet temperature is not equal to the actual water outlet temperature, S7 is executed.

[0087] S7: Determine whether the temperature difference between the actual outlet water temperature and the set outlet water temperature is less than a temperature difference threshold.

[0088] The temperature difference threshold refers to a range of the temperature difference between the actual outlet water temperature and the set outlet water temperature. The temperature difference threshold can be set according to the actual situation. For example, the temperature difference threshold can be but not limited to: ±3.

[0089] If the temperature difference between the actual outlet water temperature and the set outlet water temperature is not less than the temperature difference threshold, execute S8; if the temperature difference between the actual outlet water temperature and the set outlet water temperature is less than the temperature difference threshold, execute S9.

[0090] S8. Determine whether it is the lower limit value of the combustion power in the current gear.

[0091] If yes, execute S10, if no, return to execute S5.

[0092] S9: Determine whether the actual outlet water temperature is lower than the set outlet water temperature.

[0093] If yes, execute S11; if no, return to execute S5.

[0094] S10: Determine whether it is the minimum gear position.

[0095] If yes, return to execute S5; if no, switch to the next gear for combustion and return to execute S5.

[0096] S11, determining whether it is the maximum gear position.

[0097] If yes, the process returns to S5; if no, the process returns to S12.

[0098] S12, determining whether the combustion power reaches or exceeds the lower limit of the previous gear.

[0099] If yes, the engine switches to the previous gear for combustion and returns to S5; if no, the engine returns directly to S5.

[0100] This embodiment provides a module schematic diagram of a gas water heater control device, such as Figure 2 As shown, including:

[0101] The calculation module 21 is used to calculate the required heat value of the gas water heater when the temperature difference between the actual outlet water temperature of the gas water heater and the set outlet water temperature is adjusted to be less than the temperature difference threshold.

[0102] The determination module 22 is used to determine an initial firepower level that matches the required calorific value.

[0103] The first judgment module 23 is used to judge whether the combustion firepower of the initial firepower level falls within a preset firepower range when the temperature difference is adjusted at the initial firepower level.

[0104] The control module 24 is used to control the gas water heater to operate at a fire power level adjacent to the initial fire power level when the judgment result is no.

[0105] Optionally, the control module 24 is specifically used for:

[0106] When the combustion firepower is less than the lower limit of the preset firepower range, the gas water heater is controlled to operate at the next firepower level of the initial firepower level; the lower limit of the combustion firepower of the next firepower level is less than the lower limit of the combustion firepower of the initial firepower level.

[0107] When the combustion firepower is greater than the upper limit value of the preset firepower range, the gas water heater is controlled to operate at the previous firepower level of the initial firepower level; the upper limit value of the combustion firepower of the previous firepower level is greater than the upper limit value of the combustion firepower of the initial firepower level.

[0108] Optionally, the combustion power is characterized by at least one parameter of the gas water heater's fan speed, gas flow rate and air flow rate.

[0109] The first judging module 23 is specifically used to judge whether the parameter value of each parameter falls within the respective parameter value range.

[0110] Optionally, the control module is also used to control the gas water heater to operate at an initial fire power level when the judgment result is yes.

[0111] Optionally, the gas water heater control device further includes:

[0112] The second judgment module 25 is used to judge whether the gas water heater is turned on the high-efficiency and low-noise mode.

[0113] If the high efficiency and low noise mode is not turned on, the control module is called to control the gas water heater to operate at the initial fire power level.

[0114] If the high efficiency and low noise mode is turned on, the first judgment module is called.

[0115] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The device embodiment described above is only schematic, in which the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the present invention. Ordinary technicians in this field can understand and implement it without paying creative work.

[0116] Figure 5 A schematic diagram of another gas water heater provided by an exemplary embodiment of the present invention is shown as a block diagram of an exemplary gas water heater 40 suitable for implementing an embodiment of the present invention. Figure 5 The gas water heater 40 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0117] like Figure 5 As shown, the gas water heater 40 can be in the form of a general computing device, for example, it can be a server device. The components of the gas water heater 40 can include but are not limited to: at least one processor 41, at least one memory 42, and a bus 43 connecting different system components (including the memory 42 and the processor 41).

[0118] The bus 43 includes a data bus, an address bus, and a control bus.

[0119] The memory 42 may include a volatile memory, such as a random access memory (RAM) 421 and / or a cache memory 422 , and may further include a read-only memory (ROM) 423 .

[0120] The memory 42 may also include a program tool 425 (or utility) having a set (at least one) of program modules 424, such program modules 424 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0121] The processor 41 executes various functional applications and data processing by running the computer program stored in the memory 42, such as the method provided in any of the above embodiments.

[0122] The gas water heater 40 may also communicate with one or more external devices 44 (e.g., keyboards, pointing devices, etc.). Such communication may be performed via an input / output (I / O) interface 45. Furthermore, the model-generated gas water heater 40 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 46. As shown, the network adapter 46 communicates with other modules of the model-generated gas water heater 40 via a bus 43. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the model-generated gas water heater 40, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems, etc.

[0123] It should be noted that although several units / modules or sub-units / modules of the gas water heater are mentioned in the above detailed description, such division is merely exemplary and not mandatory. In fact, according to an embodiment of the present invention, the features and functions of two or more units / modules described above may be embodied in one unit / module. Conversely, the features and functions of one unit / module described above may be further divided to be embodied by multiple units / modules.

[0124] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the method provided by any of the above embodiments is implemented.

[0125] The readable storage medium may include but is not limited to: a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device or any suitable combination of the above.

[0126] In a possible implementation manner, the embodiment of the present invention may also be implemented in the form of a program product, which includes a program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute a method for implementing any of the above embodiments.

[0127] The program code for executing the present invention may be written in any combination of one or more programming languages, and may be executed entirely on a user device, partially on a user device, as an independent software package, partially on a user device and partially on a remote device, or entirely on a remote device.

[0128] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A gas water heater control method, characterized in that: include: Calculating the required calorific value of the gas water heater when the temperature difference between the actual outlet water temperature of the gas water heater and the set outlet water temperature is adjusted to be less than the temperature difference threshold; Determining an initial firepower level that matches the required calorific value; Determining whether the combustion firepower of the initial firepower level falls within a preset firepower range when the temperature difference is adjusted at the initial firepower level; If the judgment result is negative, the gas water heater is controlled to operate at a fire power level adjacent to the initial fire power level; The step of controlling the gas water heater to operate at a fire power level adjacent to the initial fire power level comprises: When the combustion firepower is less than the lower limit of the preset firepower range, the gas water heater is controlled to operate at the next firepower level of the initial firepower level; the lower limit of the combustion firepower of the next firepower level is less than the lower limit of the combustion firepower of the initial firepower level; When the combustion firepower is greater than the upper limit of the preset firepower range, the gas water heater is controlled to operate at the upper firepower level of the initial firepower level; the upper limit of the combustion firepower of the upper firepower level is greater than the upper limit of the combustion firepower of the initial firepower level; The combustion firepower is characterized by at least one parameter of the fan speed, gas flow rate and air flow rate of the gas water heater; Determining whether the combustion firepower of the initial firepower level falls within a preset firepower range includes: Determine whether the parameter value of each parameter falls within the respective parameter value range; The gas water heater control method further includes: When the judgment result is yes, the gas water heater is controlled to operate at the initial fire power level.

2. The gas water heater control method according to claim 1, characterized in that: Before the step of judging whether the combustion firepower of the initial firepower level falls within a preset firepower range when adjusting the temperature difference at the initial firepower level, the method includes: Determine whether the gas water heater is in high efficiency and low noise mode; If the high efficiency and low noise mode is not turned on, controlling the gas water heater to operate at the initial fire power level; If the high efficiency and low noise mode is turned on, a step is performed to determine whether the combustion firepower of the initial firepower level falls within a preset firepower range when the temperature difference is adjusted with the initial firepower level.

3. A gas water heater control device, characterized in that: include: A calculation module, used for calculating the required heat value of the gas water heater when the temperature difference between the actual outlet water temperature of the gas water heater and the set outlet water temperature is adjusted to be less than the temperature difference threshold; A determination module, used to determine an initial firepower level that matches the required calorific value; A first judgment module is used to judge whether the combustion firepower of the initial firepower level falls within a preset firepower range when the temperature difference is adjusted at the initial firepower level; A control module, for controlling the gas water heater to operate at a fire power level adjacent to the initial fire power level when the judgment result is negative; The control module is specifically used for: When the combustion firepower is less than the lower limit of the preset firepower range, the gas water heater is controlled to operate at the next firepower level of the initial firepower level; the lower limit of the combustion firepower of the next firepower level is less than the lower limit of the combustion firepower of the initial firepower level; When the combustion firepower is greater than the upper limit of the preset firepower range, the gas water heater is controlled to operate at the upper firepower level of the initial firepower level; the upper limit of the combustion firepower of the upper firepower level is greater than the upper limit of the combustion firepower of the initial firepower level; The combustion firepower is characterized by at least one parameter of the fan speed, gas flow rate and air flow rate of the gas water heater; The first judgment module is specifically used to judge whether the parameter value of each parameter falls within the respective parameter value range; The control module is also used to control the gas water heater to operate at the initial fire power level when the judgment result is yes.

4. The gas water heater control device according to claim 3, characterized in that: The gas water heater control device further comprises: The second judgment module is used to judge whether the gas water heater is turned on the high-efficiency and low-noise mode; If the high efficiency and low noise mode is not turned on, calling the control module to control the gas water heater to operate at the initial fire power level; If the high-efficiency and low-noise mode is turned on, the first judgment module is called.

5. A gas water heater, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the gas water heater control method according to any one of claims 1 to 2 is implemented.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the gas water heater control method according to any one of claims 1 to 2 is implemented.

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