Control methods and systems for load calibration of gas water heaters

Abstract

This invention discloses a control method and system for load calibration of a gas water heater, comprising: after the water flow reaches the maximum preset flow, adjusting the proportional valve and the fan to operate at the minimum load point of the section to be calibrated; when the change value of the first outlet water temperature within a first preset time period is less than a first threshold, collecting the first inlet water temperature and the first water flow, and calculating the first load parameter; when the maximum preset load of the section to be calibrated is lower than the first output load limit, adjusting the proportional valve and the fan to operate at the maximum load point of the section to be calibrated; when the change value of the second outlet water temperature within a second preset time period is less than a second threshold, collecting the second inlet water temperature and the second water flow, and calculating the second load parameter. This invention automatically calibrates the load parameters of each section based on the inlet water temperature, outlet water temperature, and water flow corresponding to the machine operating at the maximum and minimum load points, avoiding the low accuracy of batch average calibration.

Description

Technical Field

[0001] This invention relates to the field of water heater technology, and in particular to a control method and system for load calibration of a gas water heater. Background Technology

[0002] Gas water heaters work by mixing gas and air, igniting the mixture, and transferring the heat to cold water via a heat exchanger, thus raising the water temperature. Gas water heaters are typically calibrated for their output load at the factory, based on different combustion stages. During actual use, the gas water heater adjusts its combustion based on this calibrated output load to ensure a constant water temperature.

[0003] However, the calibrated load parameters are obtained by averaging a sample of a certain number of gas water heaters. The sample size and batch consistency of the entire unit will affect the final calibration result, thus affecting the machine's performance. Secondly, since the performance of components such as the fan, proportional valve, and flow sensor in a gas water heater has consistency errors, these errors, when superimposed on the entire unit, will result in the performance of the entire unit being controlled according to the calibrated load parameters at the factory. This leads to increased individual differences in the machines due to batch calibration, resulting in a poor user experience. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the load of gas water heaters is calibrated by batch average value, resulting in large differences in the performance of individual machines, and to provide a control method and system for load calibration of gas water heaters.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] In a first aspect, the present invention provides a control method for load calibration of a gas water heater, the gas water heater comprising a proportional valve and a fan, the control method comprising:

[0007] After the water flow reaches the maximum preset flow, adjust the proportional valve and the fan to operate at the minimum load point of the section to be calibrated;

[0008] When the change in the first outlet water temperature within a first preset time period is less than a first threshold, the first inlet water temperature and the first water flow rate are collected.

[0009] The first load parameter is calculated based on the first inlet water temperature, the first outlet water temperature, and the first water flow rate; the first load parameter includes a first output load limit value.

[0010] When the maximum preset load of the section to be calibrated is lower than the first output load limit, the proportional valve and the fan are adjusted to operate at the maximum load point of the section to be calibrated.

[0011] When the change in the second outlet water temperature is less than the second threshold during the second preset time period, the second inlet water temperature and the second water flow rate are collected.

[0012] The second load parameter is calculated based on the second inlet water temperature, the second outlet water temperature, and the second water flow rate; the first load parameter and the second load parameter are used to control the combustion cut-off of the gas water heater so as to achieve constant temperature water output.

[0013] Preferably, the gas water heater includes multiple calibration stages, and the control method further includes:

[0014] When calibrating multiple segments to be calibrated, the calibration is performed sequentially from the lowest segment to the highest segment; the number of fire racks corresponding to the lowest segment is lower than the number of fire racks corresponding to the highest segment.

[0015] Preferably, the control method further includes:

[0016] When the maximum preset load of the segment to be calibrated is not lower than the first output load limit, check whether the minimum preset load of the other higher segments is lower than the first output load limit.

[0017] If not, the combustion of the gas water heater is cut off according to the minimum preset load of the high-level control.

[0018] Preferably, the first load parameter further includes a first demand load and a first output load;

[0019] The first demand load is obtained by multiplying the difference between the set temperature threshold and the first inlet water temperature by the first water flow rate; the first output load is obtained by multiplying the difference between the first outlet water temperature and the first inlet water temperature by the first water flow rate; the first output load limit is obtained by multiplying the difference between the maximum set temperature threshold and the first inlet water temperature by the first water flow rate.

[0020] Secondly, the present invention provides a control system for load calibration of a gas water heater, the gas water heater including a proportional valve and a fan, the control system including:

[0021] The first adjustment module is used to adjust the proportional valve and the blower to the minimum load point of the section to be calibrated after the water flow reaches the maximum preset flow rate.

[0022] The first acquisition module is used to acquire the first inlet water temperature and the first water flow rate when the change value of the first outlet water temperature within a first preset time period is less than the first threshold.

[0023] The first calculation module is used to calculate a first load parameter based on the first inlet water temperature, the first outlet water temperature and the first water flow rate; the first load parameter includes a first output load limit value.

[0024] The second adjustment module is used to adjust the proportional valve and the fan to operate at the maximum load point of the section to be calibrated when the maximum preset load of the section to be calibrated is lower than the first output load limit value.

[0025] The second acquisition module is used to acquire the second inlet water temperature and the second water flow rate when the change value of the second outlet water temperature within the second preset time period is less than the second threshold.

[0026] The second calculation module is used to calculate the second load parameter based on the second inlet water temperature, the second outlet water temperature and the second water flow rate; the first load parameter and the second load parameter are used to control the combustion cut-off of the gas water heater so as to achieve constant temperature water output.

[0027] Preferably, the gas water heater includes multiple calibration stages, and the control system further includes:

[0028] The calibration module is used to calibrate multiple segments in order from low to high when calibrating them; the number of fire racks corresponding to the low segment is lower than the number of fire racks corresponding to the high segment.

[0029] Preferably, the control system further includes:

[0030] The detection module is used to detect whether the minimum preset load of other higher segments is lower than the first output load limit when the maximum preset load of the segment to be calibrated is not lower than the first output load limit; if not, the control module is invoked.

[0031] The control module is used to control the combustion cut-off of the gas water heater according to the minimum preset load of the high-level segment.

[0032] Preferably, the first load parameter further includes a first demand load and a first output load;

[0033] The first demand load is obtained by multiplying the difference between the set temperature threshold and the first inlet water temperature by the first water flow rate; the first output load is obtained by multiplying the difference between the first outlet water temperature and the first inlet water temperature by the first water flow rate; the first output load limit is obtained by multiplying the difference between the maximum set temperature threshold and the first inlet water temperature by the first water flow rate.

[0034] Thirdly, the present invention also provides a gas water heater, including a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein when the computer program is executed by the processor, it implements the control method for gas water heater load calibration as described in any one of the first aspects.

[0035] Fourthly, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the control method for load calibration of a gas water heater as described in any one of the first aspects.

[0036] The positive and progressive effects of this invention are as follows: It provides a control method and system for load calibration of a gas water heater. After the water flow reaches the maximum preset flow rate, the proportional valve and fan are adjusted to operate at the minimum load point of the calibration segment. When the change value of the first outlet water temperature within a first preset time period is detected to be less than a first threshold, the first inlet water temperature and the first water flow rate are collected, and the first load parameter is calculated. When the maximum preset load of the calibration segment is lower than the first output load limit value, the proportional valve and fan are adjusted to operate at the maximum load point of the calibration segment. When the change value of the second outlet water temperature within a second preset time period is detected to be less than a second threshold, the second inlet water temperature and the second water flow rate are collected, and the second load parameter is calculated. This invention automatically calibrates the load parameters of each segment based on the inlet water temperature, outlet water temperature, and water flow rate corresponding to the gas water heater operating at the maximum and minimum load points. This effectively ensures constant temperature water output, solves the problem of low accuracy caused by batch average calibration, improves the performance of the gas water heater, and enhances the user experience. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the first process of the control method for load calibration of a gas water heater according to Embodiment 1 of the present invention.

[0038] Figure 2 This is a schematic diagram of the second process of the control method for load calibration of a gas water heater according to Embodiment 1 of the present invention.

[0039] Figure 3 This is a schematic diagram of the control system for load calibration of a gas water heater according to Embodiment 2 of the present invention.

[0040] Figure 4 This is a schematic diagram of the hardware structure of the gas water heater according to Embodiment 3 of the present invention. Detailed Implementation

[0041] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0042] Example 1

[0043] This embodiment provides a control method for load calibration of a gas water heater, such as... Figure 1 As shown, the gas water heater includes a proportional valve and a fan, and the control method includes:

[0044] S11. After the water flow reaches the maximum preset flow, adjust the proportional valve and the blower to work at the minimum load point of the section to be calibrated.

[0045] S12. When the change value of the first outlet water temperature within the first preset time period is less than the first threshold, the first inlet water temperature and the first water flow rate are collected.

[0046] S13. Calculate the first load parameters based on the first inlet water temperature, the first outlet water temperature, and the first water flow rate; the first load parameters include the first output load limit value.

[0047] S141. When the maximum preset load of the section to be calibrated is lower than the first output load limit, adjust the proportional valve and the fan to work at the maximum load point of the section to be calibrated.

[0048] S151. When the change value of the second outlet water temperature is detected to be less than the second preset threshold during the second preset time period, the second inlet water temperature and the second water flow rate are collected.

[0049] S16. The second load parameter is calculated based on the second inlet water temperature, the second outlet water temperature, and the second water flow rate; the first load parameter and the second load parameter are used to control the combustion cut-off of the gas water heater so as to achieve constant temperature water output.

[0050] The first load parameter also includes the first demand load and the first output load;

[0051] The first demand load is obtained by multiplying the difference between the set temperature threshold and the first inlet water temperature by the first water flow rate; the first output load is obtained by multiplying the difference between the first outlet water temperature and the first inlet water temperature by the first water flow rate; the first output load limit is obtained by multiplying the difference between the maximum set temperature threshold and the first inlet water temperature by the first water flow rate.

[0052] In this embodiment, the structural components of the gas water heater may include a proportional valve, a fan, a flow meter, a temperature sensor, and an offline storage device. The gas water heater has multiple burners, with different sections corresponding to different numbers of burners. During combustion, different burners are controlled to ignite according to the required load. Each section to be calibrated has a corresponding maximum and minimum output load. The minimum or maximum output load of each section to be calibrated under actual combustion conditions is calibrated to control the combustion cut-off of the gas water heater, ensuring a constant temperature water output. The more accurate the load parameter calibration, the better the temperature control effect of the gas water heater. It is understood that the power ratio of the proportional valve and fan corresponding to the maximum and minimum load points of each section to be calibrated remains fixed.

[0053] In practice, when pre-calibrating the load parameters of the gas water heater, the maximum preset flow rate corresponding to the flow meter is set to ensure that the calibration reaches the maximum load point. Once the gas water heater's fan and the gas proportional valve are started, the calibration mode corresponding to the gas water heater's load calibration is activated. After determining the calibration range, the set temperature threshold and maximum set temperature threshold corresponding to that range are obtained, providing a reference for subsequent load parameter calculations.

[0054] For steps S11-S12 above, after adjusting the proportional valve and blower to the minimum load point corresponding to the calibration section, the first outlet water temperature under the current state is collected using a temperature sensor. When the first outlet water temperature does not change within 10 seconds, the first outlet water temperature under the current state is collected using a temperature sensor, and the first water flow rate is collected using a flow meter. In this embodiment, the first preset time period is set to 10 seconds, and the first threshold is set to 0.

[0055] For step S13 above, the first demand load is calculated based on the first inlet water temperature, the set temperature threshold, and the first water flow rate; the first output load is calculated based on the first outlet water temperature, the first inlet water temperature, and the first water flow rate; and the first output load limit value is calculated based on the maximum set temperature threshold, the first inlet water temperature, and the first water flow rate. The first load parameter is obtained from the first demand load, the first output load, and the first output load limit value, and is stored in an offline memory. This first load parameter is the load calibration result of the proportional valve and the fan when operating at the minimum load point.

[0056] Regarding steps S141-S151 above, when the maximum preset load of the section to be calibrated is less than the calculated first output load limit, the proportional valve and fan are adjusted to operate at the maximum load point of the section to be calibrated. This method ensures that even when the water flow rate is adjusted to the maximum preset flow rate, the outlet water flow rate is very small, avoiding safety hazards caused by cutting off combustion control according to the maximum preset load of the section to be calibrated. When the second outlet water temperature does not change within 10 seconds, the second outlet water temperature under the current state is collected using a temperature sensor, and the second water flow rate is collected using a flow meter. In this embodiment, the second preset time period is set to 10 seconds, and the second threshold is set to 0.

[0057] Regarding step S16 above, the second demand load is calculated based on the second inlet water temperature, the set temperature threshold, and the second water flow rate; the second output load is calculated based on the second outlet water temperature, the second inlet water temperature, and the second water flow rate; the second output load limit value is calculated based on the maximum set temperature threshold, the second inlet water temperature, and the second water flow rate, and the second load parameters are stored in the offline memory. The second load parameter, obtained from the second demand load, the second output load, and the second output load limit value, is stored in the offline memory. This second load parameter represents the load calibration result of the proportional valve and the blower when operating at the maximum load point.

[0058] In one possible implementation scheme, such as Figure 2 As shown, the control method also includes:

[0059] S142. When the maximum preset load of the segment to be calibrated is not lower than the first output load limit, check whether the minimum preset load of the other higher segments is lower than the first output load limit; if not, proceed to step S152.

[0060] S152. Control the combustion shut-off of the gas water heater according to the minimum preset load of the high-level segment.

[0061] Regarding steps S142-S143 above, there are three calibration stages: stage one, stage two, and stage three. When the calibration stage is stage one, the maximum preset load of stage one is higher than or equal to the first output load limit. If the minimum preset load of stage two is detected to be lower than the first output load limit, the proportional valve and fan are adjusted to operate at the minimum load point of the calibration stage two. If the minimum preset load of stage two is detected to be not lower than the first output load limit, the minimum preset load of the higher stage is used for combustion cutoff control of the gas water heater at the higher stage.

[0062] In one possible implementation, the gas water heater includes multiple calibration stages, and the control method further includes:

[0063] When calibrating multiple segments, the calibration is performed sequentially from the lowest segment to the highest segment; the number of fire racks corresponding to the lowest segment is lower than the number of fire racks corresponding to the highest segment.

[0064] Specifically, if there are three segments to be calibrated, they are designated as segment one, segment two, and segment three in order from the lowest to the highest segment. During the load calibration process, the lowest segment is calibrated first, and then the highest segment is calibrated. The load calibration method for different segments to be calibrated is the same, and will not be repeated here.

[0065] In this embodiment, a control method for load calibration of a gas water heater is provided. The method automatically calibrates the load parameters of each stage based on the inlet water temperature, outlet water temperature, and water flow rate corresponding to the gas water heater operating at the maximum and minimum load points. This effectively ensures constant temperature water output, solves the problem of low accuracy caused by batch average calibration, improves the performance of the gas water heater, and enhances the user experience.

[0066] Example 2

[0067] In this embodiment, a control system for calibrating the load of a gas water heater is provided, such as... Figure 3 As shown, the gas water heater includes a proportional valve and a fan, and the control system includes: a first adjustment module 210, a first acquisition module 220, a first calculation module 230, a second adjustment module 241, a second acquisition module 251, and a second calculation module 260.

[0068] The first adjustment module 210 is used to adjust the proportional valve and the blower to the minimum load point of the section to be calibrated after the water flow reaches the maximum preset flow.

[0069] The first acquisition module 220 is used to acquire the first inlet water temperature and the first water flow rate when the change value of the first outlet water temperature within a first preset time period is less than the first threshold.

[0070] The first calculation module 230 is used to calculate the first load parameters based on the first inlet water temperature, the first outlet water temperature and the first water flow rate; the first load parameters include the first output load limit value.

[0071] The second adjustment module 241 is used to adjust the proportional valve and the fan to the maximum load point of the section to be calibrated when the maximum preset load of the section to be calibrated is lower than the first output load limit value.

[0072] The second acquisition module 251 is used to acquire the second inlet water temperature and the second water flow rate when the change value of the second outlet water temperature within the second preset time period is less than the second threshold.

[0073] The second calculation module 260 is used to calculate the second load parameters based on the second inlet water temperature, the second outlet water temperature, and the second water flow rate; the first load parameters and the second load parameters are used to control the combustion cut-off of the gas water heater so as to achieve constant temperature water output.

[0074] The first load parameter also includes the first demand load and the first output load;

[0075] The first demand load is obtained by multiplying the difference between the set temperature threshold and the first inlet water temperature by the first water flow rate; the first output load is obtained by multiplying the difference between the first outlet water temperature and the first inlet water temperature by the first water flow rate; the first output load limit is obtained by multiplying the difference between the maximum set temperature threshold and the first inlet water temperature by the first water flow rate.

[0076] In this embodiment, the structural components of the gas water heater may include a proportional valve, a fan, a flow meter, a temperature sensor, and an offline storage device. The gas water heater has multiple burners, with different sections corresponding to different numbers of burners. During combustion, different burners are controlled to ignite according to the required load. Each section to be calibrated has a corresponding maximum and minimum output load. The minimum or maximum output load of each section to be calibrated under actual combustion conditions is calibrated to control the combustion cut-off of the gas water heater, ensuring a constant temperature water output. The more accurate the load parameter calibration, the better the temperature control effect of the gas water heater. It is understood that the power ratio of the proportional valve and fan corresponding to the maximum and minimum load points of each section to be calibrated remains fixed.

[0077] In practice, when pre-calibrating the load parameters of the gas water heater, the maximum preset flow rate corresponding to the flow meter is set to ensure that the calibration reaches the maximum load point. Once the gas water heater's fan and the gas proportional valve are started, the calibration mode corresponding to the gas water heater's load calibration is activated. After determining the calibration range, the set temperature threshold and maximum set temperature threshold corresponding to that range are obtained, providing a reference for subsequent load parameter calculations.

[0078] After the first adjustment module 210 adjusts the proportional valve and the blower to operate at the minimum load point corresponding to the calibration section, it uses a temperature sensor to collect the first outlet water temperature under the current state. When the first outlet water temperature does not change within 10 seconds, the first acquisition module 220 uses the temperature sensor to collect the first outlet water temperature under the current state and uses a flow meter to collect the first water flow rate. In this embodiment, the first preset time period is set to 10 seconds, and the first threshold is set to 0.

[0079] The first calculation module 230 calculates the first demand load based on the first inlet water temperature, the set temperature threshold, and the first water flow rate; it calculates the first output load based on the first outlet water temperature, the first inlet water temperature, and the first water flow rate; and it calculates the first output load limit value based on the maximum set temperature threshold, the first inlet water temperature, and the first water flow rate. The first load parameter is obtained from the first demand load, the first output load, and the first output load limit value, and is stored in an offline memory. The first load parameter is the load calibration result of the proportional valve and the fan when operating at the minimum load point.

[0080] When the maximum preset load of the calibration segment is less than the calculated first output load limit, the second adjustment module 241 adjusts the proportional valve and fan to operate at the maximum load point of the calibration segment. This method ensures that even when the water flow rate is adjusted to the maximum preset flow rate, the outlet water flow rate is very small, avoiding safety hazards caused by cutting off combustion control according to the maximum preset load of the calibration segment. When the second outlet water temperature does not change within 10 seconds, the second acquisition module 251 uses a temperature sensor to acquire the second outlet water temperature under the current state and uses a flow meter to acquire the second water flow rate. In this embodiment, the second preset time period is set to 10 seconds, and the second threshold is set to 0.

[0081] The second calculation module 260 calculates the second demand load based on the second inlet water temperature, the set temperature threshold, and the second water flow rate; it calculates the second output load based on the second outlet water temperature, the second inlet water temperature, and the second water flow rate; and it calculates the second output load limit value based on the maximum set temperature threshold, the second inlet water temperature, and the second water flow rate. The second load parameter is obtained from the second demand load, the second output load, and the second output load limit value, and is stored in an offline memory. The second load parameter represents the load calibration result of the proportional valve and the blower when operating at the maximum load point.

[0082] In one possible implementation scheme, such as Figure 3 As shown, the control system also includes:

[0083] The detection module 242 is used to detect whether the minimum preset load of the other higher segments is lower than the first output load limit when the maximum preset load of the segment to be calibrated is not lower than the first output load limit; if not, the control module 252 is invoked.

[0084] The control module 252 is used to control the combustion shut-off of the gas water heater according to the minimum preset load of the high-level stage.

[0085] There are two calibration stages, Stage 1 and Stage 2. When the calibration stage is Stage 1, the maximum preset load of Stage 1 is higher than or equal to the first output load limit. Detection module 242 detects that the minimum preset load of Stage 2 is lower than the first output load limit, and adjusts the proportional valve and fan to operate at the minimum load point of Stage 2. When detection module 242 detects that the minimum preset load of Stage 2 is not lower than the first output load limit, control module 252 uses the minimum preset load of Stage 2 to control the combustion cutoff of the gas water heater at higher stages.

[0086] In one possible implementation scheme, such as Figure 3 As shown, the gas water heater includes multiple calibration stages, and the control system also includes:

[0087] The calibration module 270 is used to calibrate multiple segments to be calibrated in order from low segment to high segment; the number of fire racks corresponding to the low segment is lower than the number of fire racks corresponding to the high segment.

[0088] Specifically, if there are three segments to be calibrated, they are designated as segment one, segment two, and segment three in order from the lowest to the highest segment. During the load calibration process, the lowest segment is calibrated first, and then the highest segment is calibrated. The load calibration method for different segments to be calibrated is the same, and will not be repeated here.

[0089] In this embodiment, a control system for calibrating the load of a gas water heater is provided. Based on the inlet water temperature, outlet water temperature, and water flow rate corresponding to the maximum and minimum load points of the gas water heater, the load parameters of each segment are automatically calibrated, which effectively ensures constant temperature water output, solves the problem of low accuracy caused by batch average calibration, improves the performance of the gas water heater, and enhances the user experience.

[0090] Example 3

[0091] Figure 4 This is a schematic diagram of the hardware structure of a gas water heater provided in this embodiment. The gas water heater includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the control method for gas water heater load calibration of Embodiment 1. Figure 4 The gas water heater 60 shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0092] The gas water heater 60 can be represented as a general-purpose computing device, such as a server device. The components of the gas water heater 60 may include, but are not limited to: at least one processor 61, at least one memory 62, and a bus 63 connecting different system components (including memory 62 and processor 61).

[0093] Bus 63 includes a data bus, an address bus, and a control bus.

[0094] The memory 62 may include volatile memory, such as random access memory (RAM) 621 and / or cache memory 622, and may further include read-only memory (ROM) 623.

[0095] The memory 62 may also include a program / utility 625 having a set (at least one) of program modules 624, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0096] The processor 61 executes various functional applications and data processing by running computer programs stored in the memory 62, such as the control method for load calibration of a gas water heater in Embodiment 1 of the present invention.

[0097] The gas water heater 60 can also communicate with one or more external devices 64 (e.g., keyboard, pointing device, etc.). This communication can be performed via input / output (I / O) interface 65. Furthermore, the model-generated gas water heater 60 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 66. As shown, network adapter 66 communicates with other modules of the model-generated gas water heater 60 via bus 63. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the model-generated gas water heater 60, 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.

[0098] It should be noted that although several units / modules or sub-units / modules of the range hood have been mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to embodiments of the present invention, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided and embodied by multiple units / modules.

[0099] Example 4

[0100] This embodiment provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the control method for load calibration of a gas water heater in Embodiment 1.

[0101] The readable storage medium may be more specifically adopted, including but not limited to: portable disk, hard disk, random access memory, read-only memory, erasable programmable read-only memory, optical storage device, magnetic storage device, or any suitable combination thereof.

[0102] In a possible implementation, the present invention can also be implemented as a program product comprising program code, which, when the program product is run on a terminal device, is used to cause the terminal device to perform the steps of the control method for implementing the load calibration of the gas water heater of Embodiment 1.

[0103] The program code for executing the present invention can be written in any combination of one or more programming languages. The program code can be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on a remote device.

[0104] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A control method for load calibration of a gas water heater, characterized in that, The gas water heater includes a proportional valve and a fan, and the control method includes: After the water flow reaches the maximum preset flow, adjust the proportional valve and the fan to operate at the minimum load point of the section to be calibrated; When the change in the first outlet water temperature within a first preset time period is less than a first threshold, the first inlet water temperature and the first water flow rate are collected. The first load parameter is calculated based on the first inlet water temperature, the first outlet water temperature, and the first water flow rate; the first load parameter includes a first output load limit value. When the maximum preset load of the section to be calibrated is lower than the first output load limit, the proportional valve and the fan are adjusted to operate at the maximum load point of the section to be calibrated. When the change in the second outlet water temperature is less than the second threshold during the second preset time period, the second inlet water temperature and the second water flow rate are collected. The second load parameter is calculated based on the second inlet water temperature, the second outlet water temperature, and the second water flow rate; the first load parameter and the second load parameter are used to control the combustion cut-off of the gas water heater so as to achieve constant temperature water output.

2. The control method for load calibration of a gas water heater as described in claim 1, characterized in that, The gas water heater includes multiple calibration stages, and the control method further includes: When calibrating multiple segments to be calibrated, the calibration is performed sequentially from the lowest segment to the highest segment; the number of fire racks corresponding to the lowest segment is lower than the number of fire racks corresponding to the highest segment.

3. The control method for load calibration of a gas water heater as described in claim 1, characterized in that, The control method further includes: When the maximum preset load of the segment to be calibrated is not lower than the first output load limit, check whether the minimum preset load of the other higher segments is lower than the first output load limit. If not, the combustion of the gas water heater is cut off according to the minimum preset load of the high-level control.

4. The control method for load calibration of a gas water heater as described in claim 1, characterized in that, The first load parameters also include the first demand load and the first output load; The first demand load is obtained by multiplying the difference between the set temperature threshold and the first inlet water temperature by the first water flow rate; the first output load is obtained by multiplying the difference between the first outlet water temperature and the first inlet water temperature by the first water flow rate; the first output load limit is obtained by multiplying the difference between the maximum set temperature threshold and the first inlet water temperature by the first water flow rate.

5. A control system for load calibration of a gas water heater, characterized in that, The gas water heater includes a proportional valve and a fan, and the control system includes: The first adjustment module is used to adjust the proportional valve and the blower to the minimum load point of the section to be calibrated after the water flow reaches the maximum preset flow. The first acquisition module is used to acquire the first inlet water temperature and the first water flow rate when the change value of the first outlet water temperature within a first preset time period is less than the first threshold. The first calculation module is used to calculate a first load parameter based on the first inlet water temperature, the first outlet water temperature and the first water flow rate; the first load parameter includes a first output load limit value. The second adjustment module is used to adjust the proportional valve and the fan to operate at the maximum load point of the section to be calibrated when the maximum preset load of the section to be calibrated is lower than the first output load limit value. The second acquisition module is used to acquire the second inlet water temperature and the second water flow rate when the change value of the second outlet water temperature within the second preset time period is less than the second threshold. The second calculation module is used to calculate the second load parameter based on the second inlet water temperature, the second outlet water temperature and the second water flow rate; the first load parameter and the second load parameter are used to control the combustion cut-off of the gas water heater so as to achieve constant temperature water output.

6. The control system for load calibration of a gas water heater as described in claim 5, characterized in that, The gas water heater includes multiple calibration stages, and the control system further includes: The calibration module is used to calibrate multiple segments in order from low to high when calibrating them; the number of fire racks corresponding to the low segment is lower than the number of fire racks corresponding to the high segment.

7. The control method for load calibration of a gas water heater as described in claim 6, characterized in that, The control system further includes: The detection module is used to detect whether the minimum preset load of other higher segments is lower than the first output load limit when the maximum preset load of the segment to be calibrated is not lower than the first output load limit; if not, the control module is invoked. The control module is used to control the combustion cut-off of the gas water heater according to the minimum preset load of the high-level segment.

8. The control method for load calibration of a gas water heater as described in claim 5, characterized in that, The first load parameters also include the first demand load and the first output load; The first demand load is obtained by multiplying the difference between the set temperature threshold and the first inlet water temperature by the first water flow rate; the first output load is obtained by multiplying the difference between the first outlet water temperature and the first inlet water temperature by the first water flow rate; the first output load limit is obtained by multiplying the difference between the maximum set temperature threshold and the first inlet water temperature by the first water flow rate.

9. A gas water heater, characterized in that, It includes a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the control method for load calibration of a gas water heater as described in any one of claims 1-4.

10. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, it implements the control method for load calibration of a gas water heater as described in any one of claims 1-4.

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