Gas pressure self-adaptive control method, device and equipment of water heater and medium

Abstract

The application relates to a gas pressure self-adaptive control method, device, equipment and medium of a water heater. The method comprises the following steps: after a gas pressure self-adaptive function is started, if the water heater is in a target working condition, the load change speed of the water heater in a combustion process is calculated, the target working condition comprises a gas adding working condition, a gas reducing working condition and an under-load working condition; whether the water heater is in a low pressure state is judged based on the load change speed; if the water heater is in the low pressure state, the effective opening value of the water heater at a current gear is recorded; a target gas pressure value is obtained based on the effective opening value and a preset gas pressure self-adaptive database; the matching parameters of each gear of the water heater are parameter-corrected based on the target gas pressure value, wherein the matching parameters comprise air volume parameters and gas volume parameters; and the water heater after correction continues to combust. The application can improve the accuracy of low pressure state identification.

Description

Technical Field

[0001] This application relates to the field of water heater technology, and in particular to a gas pressure adaptive control method, device, equipment and medium for a water heater. Background Technology

[0002] As the core equipment for household hot water supply, the combustion stability and heat load regulation capability of gas water heaters are directly affected by gas pressure. In actual use, the gas pressure may be far below the standard value of 2000 Pa (such as below 1000 Pa), resulting in insufficient gas supply capacity.

[0003] Existing technology measures the actual combustion load using sensors such as inlet water temperature, outlet water temperature, and water flow rate, compares the actual combustion load with the theoretical value of the combustion load, analyzes the deviation between the two to determine the gas pressure status, and adjusts the limiting current of the proportional valve.

[0004] However, due to errors in sensors such as inlet water temperature, outlet water temperature, and water flow rate, the measured actual load value is inaccurate, which in turn affects the accuracy of low air pressure determination. Summary of the Invention

[0005] This application provides a gas pressure adaptive control method, device, equipment, and medium for a water heater, aiming to solve the problem that the accuracy of low gas pressure determination is relatively low due to sensor errors in traditional methods.

[0006] In a first aspect, embodiments of this application provide a gas pressure adaptive control method for a water heater, the method comprising: After the gas pressure adaptive function is activated, if the water heater is in the target operating condition, the load change rate of the water heater during the combustion process is calculated. The target operating condition includes gas filling condition, gas reduction condition, and underload condition. Based on the load change rate, determine whether the water heater is in a low-pressure state; If the water heater is in a low gas pressure state, record the effective opening value of the water heater at the current setting; Based on the effective opening value and the preset gas pressure adaptive database, the target gas pressure value is obtained; Based on the target gas pressure value, the matching parameters of each setting of the water heater are corrected, wherein the matching parameters include air volume parameters and gas volume parameters. The modified water heater continues to burn.

[0007] A further technical solution is to calculate the rate of load change during the combustion process, including: Obtain the load change and gas valve opening change of the water heater under the target operating conditions; Calculate the ratio of the load change to the valve opening change to obtain the load change rate.

[0008] A further technical solution is that, based on the effective opening value and a preset adaptive gas pressure database, the target gas pressure value is obtained, including: If there are multiple effective opening values, the effective opening value corresponding to the minimum value shall be selected as the target effective opening value. Based on the target effective opening value and the preset gas pressure adaptive database, the target gas pressure value is obtained.

[0009] A further technical solution is that, based on the load change rate, determining whether the water heater is in a low-pressure state includes: Determine whether the load change rate is less than a preset load change rate value; If the rate of load change is less than the preset rate of load change, the water heater is determined to be in a low-pressure state.

[0010] A further technical solution is that, after determining whether the water heater is in a low-pressure state, the method further includes: When the water heater is in a low gas pressure state, and when it is detected that the combustion level is repeatedly switching between two adjacent segment levels, the two segment levels where the switching occurs are recorded. The number of gear shifts within a preset time window is counted. If the number of shifts reaches a preset threshold, the target gear is determined from the two gear segments. Lock the water heater's combustion setting to the target setting; When a change in water flow rate or a change in the preset target outlet water temperature is detected, the target setting will be automatically unlocked.

[0011] A further technical solution is that the method further includes: If the water heater is in a low gas pressure state, then set the flag bit to 1; If the water heater is not in a low-pressure state, the flag bit is set to 0.

[0012] A further technical solution is that, after determining whether the water heater is in a low-pressure state, the method further includes: Record the standby time of the water heater after the corrected combustion ends; When the water heater restarts combustion, it is determined whether the standby time is greater than the preset standby time. If not, return to the step of correcting the air parameters of each setting of the water heater based on the target gas pressure value.

[0013] If so, set the low pressure flag p=0, exit the low pressure state, restore the matching parameters of each gear, and return to the step of determining whether the water heater is in a low pressure state.

[0014] Secondly, embodiments of this application also provide a gas pressure adaptive control device for a water heater, which includes a unit for performing the above-described method.

[0015] Thirdly, embodiments of this application also provide a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the above-described method.

[0016] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program that, when executed by a processor, can implement the above-described method.

[0017] This application provides a gas pressure adaptive control method, device, equipment, and medium for a water heater. The method includes: after activating the gas pressure adaptive function, if the water heater is in a target operating condition, calculating the load change rate of the water heater during combustion, wherein the target operating condition includes a gas filling condition, a gas reducing condition, and an underload condition; based on the load change rate, determining whether the water heater is in a low gas pressure state; if the water heater is in a low gas pressure state, recording the effective opening value of the water heater at the current setting; based on the effective opening value and a preset gas pressure adaptive database, obtaining a target gas pressure value; based on the target gas pressure value, correcting the matching parameters of each setting of the water heater, wherein the matching parameters include airflow parameters and gas flow parameters; and controlling the corrected water heater to continue combustion.

[0018] This application embodiment determines whether the water heater is in a low-pressure state by calculating the rate of load change during the combustion process. This improves the accuracy of low-pressure state determination, eliminates the need for an additional pressure sensor, and solves the problem in existing technologies where errors in water circuit sensors lead to inaccurate deviations between the calculated actual combustion load and the theoretical combustion load. Furthermore, by implementing low-pressure identification and gas pressure calculation under full-load segmentation in three operating conditions—gas filling, gas reducing, and underload—the accuracy and reliability of identification can be improved.

[0019] In addition, after accurately identifying the low air pressure state, the system not only adjusts the opening of the proportional valve (air volume parameter), but also adjusts the air volume of the fan at each level (air volume parameter) to ensure that the air-fuel ratio is always in the optimal combustion range. This effectively avoids problems such as air-fuel mismatch, flameout, interruption, large temperature fluctuations, and slow temperature stabilization caused by simply adjusting the opening of the proportional valve or the air volume of the fan. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0023] Figure 1 This is a schematic diagram of the pressure regulation characteristic curve of a proportional valve; Figure 2 This is a schematic diagram of the initial fan speed control curves for each gear. Figure 3 This is a schematic diagram of the initial gas adjustment curves for each gear. Figure 4 A schematic diagram showing the relationship between fully open heat load and proportional valve opening under different gas pressures; Figure 5 This is a schematic diagram showing the relationship between the heat load and the proportional valve opening at each stage when the gas pressure is 1000Pa (taking 4 stages as an example). Figure 6 This is a schematic diagram showing the relationship between the heat load and the proportional valve opening at each gear level when the gas pressure is 900Pa (taking 4 gear levels as an example). Figure 7 This is a schematic diagram showing the relationship between the heat load and the proportional valve opening at each stage when the gas pressure is 800Pa (taking 4 stages as an example). Figure 8 A flowchart illustrating the first embodiment of the gas pressure adaptive control method for a water heater provided in this application; Figure 9 A partial schematic diagram of the preset adaptive gas pressure database provided in this application.

[0024] Figure 10 A schematic diagram of the fan speed control curves for each gear of the gas water heater after low gas pressure identification correction provided in this application; Figure 11 A schematic diagram of the gas adjustment curves for each setting of the gas water heater after low gas pressure identification correction provided in this application; Figure 12 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0027] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0028] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0029] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0030] As used in this specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0031] Gas water heaters typically use a segmented combustion method, with the opening of the proportional valve controlled by current. For example... Figure 1 As shown, P1 refers to the primary pressure, and P2 refers to the secondary pressure. Imin indicates the state of minimum proportional valve current or minimum opening, corresponding to the minimum air volume of the fan, denoted as FL. Imax indicates the state of maximum proportional valve current or maximum opening, corresponding to the maximum air volume of the fan, denoted as FH. The curve PL-Imin is the pressure regulation characteristic curve of the proportional valve at its minimum opening, and the curve PH-Imax is the pressure regulation characteristic curve of the proportional valve at its maximum opening.

[0032] like Figure 2 and Figure 3 As shown, during the development and design of water heaters, to ensure optimal combustion of gas and air, a four-dimensional performance curve is typically determined through sampling, which includes heat load, burner segmentation, proportional valve opening, and fan airflow. In actual operation, the heat load, burner segmentation, proportional valve opening, and fan airflow required to reach the set outlet temperature are calculated based on the pre-sampled relationship curve, water flow rate, inlet water temperature, and set outlet water temperature. However, due to variations in the water flow sensor, inlet water temperature sensor, and outlet water temperature sensor of each water heater, differences in gas composition, altitude, and atmospheric pressure in different regions, and variations in household water and gas supply pressures (especially during peak water or gas usage periods when pressure is lower and fluctuates significantly), the actual heating curve and the sampled relationship curve can deviate considerably. Feedback adjustments are needed to correct these discrepancies and ensure a constant temperature hot water output.

[0033] The standard pressure for water heaters using natural gas as a gas source is 2000Pa. According to the pressure regulation characteristic curve, when the proportional valve current is constant, the secondary pressure increases and tends to stabilize as the primary pressure increases, achieving a pressure stabilization effect. During peak gas usage periods or when the gas inlet pressure is low, the primary pressure decreases, causing the secondary pressure to decrease as well, which in turn affects the combustion effect of the water heater. When the gas pressure is insufficient, although the opening of the gas proportional valve is increased, the actual load may not increase, while the air volume is still supplied as normal. This can lead to problems such as increased air-fuel ratio, decreased flue gas temperature, reduced load, slow load increase, substandard flue gas, interruptions between different sections, and flame extinguishing. When used by users, this can easily result in problems such as the water heater failing to reach the required temperature, long heating time, large temperature fluctuations, sudden changes in water temperature, and water heater malfunctions.

[0034] In existing technical solutions, the following methods are commonly used for identifying and adjusting low-pressure conditions: The first scenario: Calculate the deviation between the theoretical and actual combustion load values, determine the gas pressure status, and adjust the limiting current of the proportional valve.

[0035] However, errors in sensors such as inlet water temperature, outlet water temperature, and water flow rate lead to inaccurate calculations of the actual load value, thus affecting the accuracy of low air pressure detection. Furthermore, simply adjusting the proportional valve current after identifying this issue still results in problems such as airflow mismatch, power outages, and engine shutdown.

[0036] The second scenario: Under maximum load conditions, calculate the ratio of the target load to the actual load to determine low gas pressure and adjust the fan airflow accordingly.

[0037] However, differences in gas composition can cause deviations in the maximum load, making the gas pressure judgment based on the maximum load inaccurate and prone to misjudgment. Furthermore, this method is only effective at the maximum load point and cannot identify other affected load segments, which is quite limited. In addition, simply adjusting the fan air volume cannot effectively solve the impact of low gas pressure, and other loads still have problems such as gaps, large temperature fluctuations, and slow temperature stabilization.

[0038] The third scenario: Using current-linked control to widen the load overlap range between segments and reduce the pressure of load gaps.

[0039] However, when the gas pressure is very low, the maximum current increases at the low setting, but the gas flow and load do not increase, and the gas supply will still be interrupted. Instead, the increased airflow may cause the gas to be blown out. At the high setting, the minimum current decreases, which may make it difficult for the gas proportional valve to open in cold weather, leading to problems such as ignition failure, difficulty in ignition transmission, and flameout when shifting gears.

[0040] The fourth scenario: Determine low gas pressure by checking for gas gaps and adjust the opening of the gas proportional valve accordingly.

[0041] However, the gear shifting phenomenon is not only caused by low gas pressure. Non-gas pressure factors such as the response lag of the program control algorithm and water flow disturbance caused by water pressure fluctuations can also induce abnormal gear shifting.

[0042] Low gas pressure can only be detected if the gas pressure is lower than the cutoff pressure and combustion is occurring precisely at the cutoff load. Otherwise, if the gas pressure is only slightly lower or combustion is not occurring at the cutoff load, the temperature control performance is already affected, but low gas pressure cannot be detected. Therefore, this scheme can only trigger the judgment under extreme conditions. Thus, relying solely on "whether a cutoff has occurred" as the basis for judging low gas pressure is prone to misjudgment.

[0043] Furthermore, this method only adjusts the proportional valve opening after identification, but problems such as airflow mismatch, interruption, and engine stall still exist, and it cannot effectively solve the low air pressure problem.

[0044] In other words, existing technical solutions that use methods such as load deviation, maximum load ratio, and gas supply interruption to detect low gas pressure are inaccurate. These methods are easily affected by factors such as water inlet / outlet flow and volume, and can only identify a slightly low gas pressure, not the extent of the pressure drop. Furthermore, the fundamental impact of low gas pressure on water heaters is a decrease in secondary pressure, leading to a simultaneous reduction in gas supply and heat load, as well as a slower rate of load increase. When the secondary pressure reaches its limit, further increasing the opening of the gas proportional valve will not raise the secondary pressure, and adjusting the current will also become ineffective.

[0045] like Figure 4 As shown, taking a certain water heater as an example, when the primary gas pressure P1 changes from 2000Pa to 1200Pa, the maximum heat load decreases, and the rate of increase in full-load heat load significantly decreases with the increase in the proportional valve opening. When the pressure changes to 1000Pa, although the full-load heat load increases with the increase in the proportional valve opening, the rate of increase becomes increasingly slower. When the proportional valve opening reaches about 80%, the full-load heat load reaches its limit and no longer increases; further increasing the proportional valve opening has no effect. When the proportional valve opening reaches its maximum of 100%, the full-load heat load is only equivalent to about 60% of that under standard gas pressure, but the air volume is supplied at 100%. This uneven air-gas ratio affects burner performance. If the water heater's cutoff pressure is below 1000Pa, although it is affected by the low gas pressure, it will not experience a cutoff. Moreover, this uneven air-gas ratio is not only present in the maximum setting but also in other settings.

[0046] Regarding the impact of low air pressure on different speed settings, taking a 16-liter, 4-speed, 3-6-11-14 segmented water heater as an example, the opening adjustment range is I min to I max. Let I_eff represent the effective opening value at a certain speed setting, then I1eff-I4eff represent the effective opening values ​​for speeds 1-4. For example... Figure 5As shown, when the gas pressure is 1000Pa, the effective opening value I4eff of gear 4 is about 80%, I3eff of gear 3 is about 90%, I2eff of gear 2 is about 95%, and gear 1 is almost unaffected.

[0047] like Figure 6 As shown, when the gas pressure is 900Pa, the effective opening values ​​I_eff from gear 4 to gear 1 are approximately 75%-85%-90%-95% respectively; Figure 7 As shown, at a gas pressure of 800Pa, the I_eff values ​​from level 4 to level 1 are approximately 60%-65%-75%-80%, respectively. Exceeding the effective opening adjustment range, the increased airflow can even lead to a decrease in load. The relationship curves between heat load and proportional valve opening at other gas pressures were obtained from water heater sampling and are not shown here.

[0048] In other words, once the effective opening adjustment range is exceeded, further increasing the proportional valve opening becomes ineffective and will cause a drop in flue gas temperature and a reduction in load due to excessive air. This also prolongs the adjustment time within the I_eff-I max range. Especially in situations requiring load reduction, such as decreasing water flow or lowering temperature, the time required to drop from I max to I_eff is even longer, leading to problems such as longer heating times and larger temperature fluctuations.

[0049] Therefore, for low gas pressure identification, the effective opening adjustment range, maximum heat load, and load increase rate under each segment can be detected to adaptively identify the gas pressure situation. For details, refer to the gas pressure adaptive control method for water heaters provided in this application. This method can improve the accuracy of low gas pressure state identification. Furthermore, after identifying the low gas pressure state, the opening of the proportional valve and the air volume of the water heater are adjusted in a coordinated manner. This can avoid problems such as air-gas mismatch, flameout, interruption, large temperature fluctuations, and slow temperature stabilization caused by adjusting the opening of the proportional valve or the air volume of the fan alone.

[0050] See Figure 8 , Figure 8 This application provides a flowchart illustrating a first embodiment of a gas pressure adaptive control method for a water heater, which includes the following steps: Step 110: After activating the gas pressure adaptive function, if the water heater is in the target operating condition, calculate the load change rate of the water heater during the combustion process.

[0051] The target operating conditions include gas refueling, gas degassing, and underload conditions.

[0052] Step 120: Based on the load change rate, determine whether the water heater is in a low pressure state.

[0053] Step 130: If the water heater is in a low gas pressure state, record the effective opening value of the water heater at the current setting.

[0054] Step 140: Based on the effective opening value and the preset gas pressure adaptive database, obtain the target gas pressure value.

[0055] Step 150: Based on the target gas pressure value, adjust the matching parameters of each setting of the water heater.

[0056] The matching parameters include air volume parameters and gas volume parameters.

[0057] Step 160: Control the corrected water heater to continue burning.

[0058] This embodiment determines whether the water heater is in a low-pressure state by calculating the rate of load change during the combustion process. This improves the accuracy of low-pressure state determination, eliminates the need for an additional pressure sensor, reduces costs and gas leakage risks, and solves the problem in existing technologies where errors in water circuit sensors lead to inaccurate deviations between the calculated actual combustion load and the theoretical combustion load.

[0059] Furthermore, by enabling low gas pressure identification and gas pressure calculation under full load segments in three operating conditions—gas filling, gas reducing, and underload—the accuracy and reliability of identification can be improved.

[0060] In addition, after accurately identifying the low air pressure state, the system not only adjusts the opening of the proportional valve (air volume parameter), but also adjusts the air volume of the fan at each level (air volume parameter) to ensure that the air-fuel ratio is always in the optimal combustion range. This effectively avoids problems such as air-fuel mismatch, flameout, interruption, large temperature fluctuations, and slow temperature stabilization caused by simply adjusting the opening of the proportional valve or the air volume of the fan.

[0061] Referring to a second embodiment of the gas pressure adaptive control method for a water heater provided in this application, the gas pressure adaptive control method for the water heater includes the following steps: Step 210: After activating the gas pressure adaptive function, if the water heater is in the target operating condition, calculate the load change rate of the water heater during the combustion process.

[0062] In some embodiments, the system can be configured with a manually adjustable default code EE to control the on / off state of the gas pressure adaptive function. EE=00 can be the default value to indicate that the gas pressure adaptive function is on, and EE=01 can be the default value to indicate that the gas pressure adaptive function is off.

[0063] For example, after the unit is powered on, the default code EE can be read to determine whether the default code EE is 00. If EE=00, the gas pressure adaptive function is enabled; if EE=01, the gas pressure adaptive function is disabled, so that the water heater operates according to normal logic.

[0064] The target operating conditions include gas refueling, gas degassing, and underload conditions.

[0065] In some embodiments, calculating the load change rate during the combustion process in step 210 includes: Step 211: Obtain the load change and gas valve opening change of the water heater under the target operating conditions; Step 212: Calculate the ratio of the load change to the valve opening change to obtain the load change rate.

[0066] For details, please refer to Formula 1 below: k = ΔQ / ΔI, Formula 1.

[0067] Where ΔQ is the load change, ΔI is the valve opening change, and k is the load change rate. ΔI can be selected as an appropriate value as needed, such as 1%-5%.

[0068] Step 220: Based on the load change rate, determine whether the water heater is in a low pressure state.

[0069] In some embodiments, determining whether the water heater is in a low-pressure state based on the load change rate includes: Step 221: Determine whether the load change rate is less than a preset load change rate value; Step 222: If the load change rate is less than the preset load change rate value, then the water heater is determined to be in a low pressure state.

[0070] The preset load change rate value k0 can be the minimum load change rate (determined based on water heater sampling). When k < k0, it indicates that the load change is slow, meaning that the load hardly increases as the opening degree increases, which can be judged as a low pressure state.

[0071] Step 230: If the water heater is in a low pressure state, record the effective opening value of the water heater at the current setting.

[0072] For example, record the opening degree of the proportional valve at this time as the effective opening value I_eff of the current gear. For instance, record I3eff for gear 3.

[0073] In some embodiments, if the water heater is in a low-pressure state, the flag bit is set to 1; if the water heater is in a non-low-pressure state, the flag bit is set to 0.

[0074] Among them, the low pressure flag p can adapt to environmental changes and periodically restore and update the low pressure identification status.

[0075] Step 240: Based on the effective opening value and the preset gas pressure adaptive database, obtain the target gas pressure value.

[0076] For example, if I4eff < 75%, or I3eff < 85%, or I2eff < 90%, or I1eff < 95%, the target gas pressure value of 900Pa can be calculated using the effective opening value of any gear.

[0077] In some embodiments, step 240, namely obtaining the target gas pressure value based on the effective opening value and a preset gas pressure adaptive database, includes: Step 241: If there are multiple effective opening values, select the effective opening value corresponding to the minimum value as the target effective opening value.

[0078] For example, during the refueling process, there may be multiple values ​​for I_eff corresponding to k < k0 in a certain gear (for example, multiple I3eff values ​​may be recorded in gear 3). The minimum value among them is the effective opening value of the current gear, which is the target effective opening value.

[0079] Similarly, during the gas reduction process, I_eff of a certain gear may have multiple values ​​(for example, multiple I3eff may be recorded in gear 3). The minimum value among them is the effective opening value of the current gear, which is the target effective opening value.

[0080] Step 242: Based on the target effective opening value and the preset gas pressure adaptive database, obtain the target gas pressure value.

[0081] The preset adaptive gas pressure database can include the relationship curves between the heat load of each segment and the opening of the proportional valve under different gas pressures. Based on this, the target gas pressure value can be obtained according to the relationship curves between the heat load of each segment and the opening of the proportional valve under different gas pressures when the water heater is sampled.

[0082] Thus, by constructing a database (i.e., a gas pressure adaptive database), the air parameters of each gear can be matched according to the performance curve under low gas pressure, which facilitates gas pressure identification and parameter correction during the combustion operation of the whole machine.

[0083] In some embodiments, the preset gas pressure adaptive database can be as follows: Figure 9As shown, the value ranges of I_eff and F_match for each gear can be determined based on the actual sampling situation.

[0084] In summary, the following references can be used for low gas pressure identification and gas pressure calculation under three conditions: refueling, degassing, and underload: 1) Low pressure identification during gas refueling: When the load needs to be increased, the proportional valve opening will increase under any segmented gear. Therefore, low pressure identification can be performed in real time during gas refueling.

[0085] Specifically, during the gas filling process, if it is determined that k < k0, it indicates that the load changes slowly, that is, the load hardly increases as the opening degree increases. This is then determined to be a low gas pressure state, the flag p = 1, and the opening degree of the proportional valve at this time is recorded as the effective opening degree value I_eff of the current segment. The gas pressure value is obtained based on the relationship curve between the heat load of each segment and the opening degree of the proportional valve under different gas pressures when the water heater is sampled. The air-gas matching parameters of each segment are adjusted accordingly.

[0086] The low-pressure state recognition can be automatically calculated in real time at any level and during any refueling process, without affecting the normal refueling speed and time, or the overall performance and temperature control.

[0087] 2) Low pressure identification during gas reduction process: Under any segmented gear, when the load needs to be reduced, the proportional valve opening will decrease. Therefore, low pressure identification can be performed in real time during the gas reduction process.

[0088] Specifically, during the gas reduction process, if it is determined that k < k0, it indicates that the load change is slow, that is, the load hardly decreases as the opening decreases. This is then determined to be a low gas pressure state, the flag p = 1, and the opening of the proportional valve at this time is recorded as the effective opening value I_eff of the current segment. The gas pressure value is obtained based on the relationship curve between the heat load of each segment and the opening of the proportional valve under different gas pressures when the water heater is sampled. The air-gas matching parameters of each segment are adjusted accordingly.

[0089] The low-pressure state recognition can be automatically calculated in real time at any level and during any gas reduction process, without affecting the normal gas reduction speed and time, or the overall performance and constant temperature effect.

[0090] 3) Low Gas Pressure Detection under Underload Conditions: When the load is insufficient, the proportional valve opening will be increased or the speed will be increased to improve the load. When the water heater can burn stably at a certain speed (e.g., during a short-circuit lockout), and the proportional valve opening is already at its maximum, but the load still does not meet the demand, the system will actively reduce the opening to detect underload conditions. If k < k0, it is determined to be a low gas pressure condition, and the flag p = 1. Furthermore, the opening will be actively reduced until k > k0, and the effective opening value I_eff of the current speed will be recorded. Based on the relationship curve between the heat load of each speed segment and the proportional valve opening under different gas pressures during water heater sampling, the gas pressure value will be obtained, and the air-gas matching parameters of each speed segment will be adjusted accordingly.

[0091] Thus, this application can detect and identify low gas pressure across the entire load range. At any setting, it can detect whether the gas pressure is low by the relationship between the load growth rate and the current adjustment rate, without affecting normal combustion.

[0092] Step 250: Based on the target gas pressure value, adjust the matching parameters of each setting of the water heater.

[0093] The matching parameters include air volume parameters and gas volume parameters.

[0094] For example, the optimal matching air volume corresponding to the proportional valve opening degree I_eff at a certain segment is represented by F_match, and the initial performance matching curve of the gas water heater is as follows: Figure 2 and Figure 3 As shown.

[0095] like Figure 9- Figure 10 As shown, Figure 9- Figure 10 To correct the performance matching curve for low gas pressure identification in gas water heaters, this application adaptively adjusts the airflow matching parameters for each speed setting after identifying low gas pressure. Based on the relationship curves between heat load and proportional valve opening at different gas pressures during water heater sampling, the maximum proportional valve opening for speed setting 4 is adjusted to I4eff, while the maximum airflow is adjusted to F4match for adaptation. Therefore, the proportional valve opening range for speed setting 4 becomes I min-I4eff, and the airflow range becomes FL-F4match. Similarly, the maximum proportional valve opening for speed settings 3-1 is adjusted to I3eff-I1eff, while the maximum airflow is adjusted to F3match-F1match for adaptation.

[0096] Based on this, after identifying low gas pressure, it can adaptively reduce the air volume, reducing the maximum air volume of each segment to different degrees, maintaining the optimal air-fuel ratio and higher combustion efficiency, making combustion more stable, and avoiding problems such as blowout and stalling during gear shifting caused by excessive air volume.

[0097] Furthermore, adaptive and coordinated adjustment of the water heater's proportional valve opening and fan airflow can improve the water heater's adaptability, regulation capability, and intelligence level in low gas pressure environments. This effectively solves problems such as long constant temperature regulation time, large temperature fluctuations, load interruption, easy flameout, and low combustion efficiency of traditional gas water heaters under low gas pressure conditions.

[0098] In addition, the target gas pressure value can not only determine whether the gas pressure is low, but also know the gas pressure value. For example, it can determine whether the target gas pressure value is less than 1100 to identify the low gas pressure state. If the target gas pressure value is less than 1100, it is determined to be a low gas pressure state. If the target gas pressure value is not less than 1100, it is determined to be a non-low gas pressure state.

[0099] Therefore, after identifying low gas pressure, the matching parameters of each setting of the water heater are corrected according to the target gas pressure value. This allows for adaptive adjustment of the proportional valve range, reducing the ineffective adjustment range of each setting, improving constant temperature performance, reducing constant temperature adjustment time, and lowering temperature fluctuations.

[0100] Step 260: Control the corrected water heater to continue burning.

[0101] In some embodiments, after determining whether the water heater is in a low-pressure state, the method further includes: Step 270: Record the standby time of the water heater when the corrected combustion ends.

[0102] Step 280: When the water heater restarts combustion, determine whether the standby time is greater than the preset standby time.

[0103] Step 290: If not, return to the step of correcting the air parameters of the water heater at each setting based on the target gas pressure value.

[0104] In some embodiments, if so, the low pressure flag p=0 is set, the low pressure state is exited, the matching parameters of each gear are restored, and the process returns to the step of determining whether the water heater is in a low pressure state.

[0105] The preset standby time can be T. When the user is not in the peak gas usage period or the gas inlet pressure returns to normal, the system can correct the low gas pressure identification status and adjust the air matching parameters. Therefore, the standby time T is set. When the water heater is in standby for more than T minutes, the low gas pressure flag can be automatically reset to p=0, so that the system can re-identify the low gas pressure.

[0106] In some embodiments, after determining whether the water heater is in a low-pressure state, the method further includes: Step 31: When the water heater is in a low gas pressure state, and the combustion level is detected to be repeatedly switching between two adjacent segment levels, record the two segment levels where the switching occurs frequently.

[0107] Step 32: Count the number of gear shifts within the preset time window. If the number of shifts reaches the preset threshold, determine the target gear from the two gear segments.

[0108] Among them, the target setting is a segmented setting that is closer to the outlet water temperature.

[0109] Step 33: Lock the combustion setting of the water heater to the target setting.

[0110] Step 34: When a change in water flow rate or a change in the preset target outlet water temperature is detected, the target setting will be automatically unlocked.

[0111] In other words, when the two sections fail to maintain a constant temperature due to low gas pressure, the section position is recorded and the number of shifts is limited. The load is locked at the closest position to avoid multiple shifts between the two sections, thus achieving gap locking and improving constant temperature performance.

[0112] When the water volume or temperature setting is changed, the lock can be released without affecting the normal gear shifting process.

[0113] Based on the above embodiments, the gas pressure adaptive control method provided in this application may include the following: 1) Power on the entire machine; 2) Read the default code EE and determine if the default code EE = 00; If not, i.e., EE=01, execute 3-1); if yes, execute 3-2)-4). 3-1) Turn off the gas pressure adaptive function and operate according to the normal logic of the water heater; 3-2) Enable the gas pressure adaptive function; 4) The entire unit is in combustion operation, and the target gas pressure value is obtained; 5) Determine if the target gas pressure value is less than 1100; If not, it indicates a non-low pressure state; proceed to step 6-1. If yes, proceed to steps 6-2-10. 6-1) Set the low pressure flag p=0 to allow the water heater to burn according to normal parameters; Among them, when the water heater stops burning after operating according to normal parameters and waits for the next use, there is no need to record the standby time; simply return to step 4). 6-2) Retrieve the preset gas pressure adaptive database, correct the air parameters of each gear according to the target gas pressure value, and set the low gas pressure flag p=1; 7) End combustion, wait for the next use, and record the standby time; 8) Turn the water on again, and the water heater will start burning. 9) Determine if the standby time is greater than the preset standby time; If yes, execute step 10); if no, return step 6-2). 10) Set the low pressure flag p=0.

[0114] In summary, the gas pressure adaptive control method for water heaters provided in this application achieves intelligent identification through software algorithms, eliminating the need for additional pressure sensors, thus reducing costs and the risk of gas leakage. Furthermore, based on the collaborative working relationship between combustion load, segmented speed settings, gas valve opening, and fan airflow, a multi-complementary detection mechanism is constructed. Under three operating conditions—gas filling, gas reducing, and underload—it achieves low gas pressure identification and gas pressure calculation under full load segments, improving identification accuracy and reliability. This solves the problems of inaccurate low gas pressure identification leading to misjudgments, difficulty in calculating gas pressure values, and the inability of water heaters to automatically adjust system operating parameters according to gas pressure conditions in traditional technical methods.

[0115] Corresponding to the above-described adaptive gas pressure control method for water heaters, this application also provides an adaptive gas pressure control device for water heaters. This adaptive gas pressure control device includes a unit for executing the aforementioned adaptive gas pressure control method for water heaters, and can be configured in a desktop computer, tablet computer, laptop computer, or other terminal.

[0116] like Figure 12 As shown in the figure, this application provides a computer device including a processor 111, a communication interface 112, a memory 113, and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114. Memory 113 is used to store computer programs; In one embodiment of this application, when the processor 111 executes the program stored in the memory 113, it implements the gas pressure adaptive control method for a water heater provided in any of the foregoing method embodiments, including: After the gas pressure adaptive function is activated, if the water heater is in the target operating condition, the load change rate of the water heater during the combustion process is calculated. The target operating condition includes gas filling condition, gas reduction condition, and underload condition. Based on the load change rate, determine whether the water heater is in a low-pressure state; If the water heater is in a low gas pressure state, record the effective opening value of the water heater at the current setting; Based on the effective opening value and the preset gas pressure adaptive database, the target gas pressure value is obtained; Based on the target gas pressure value, the matching parameters of each setting of the water heater are corrected, wherein the matching parameters include air volume parameters and gas volume parameters. The modified water heater continues to burn.

[0117] It will be understood by those skilled in the art that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program may be stored in a storage medium, which is a computer-readable storage medium. The computer program is executed by at least one processor in the computer system to implement the process steps of the embodiments of the above methods.

[0118] Therefore, this application embodiment also provides a computer-readable storage medium storing a computer program thereon, wherein when the computer program is executed by a processor, it implements the steps of the gas pressure adaptive control method for a water heater as provided in any of the foregoing method embodiments, including: After the gas pressure adaptive function is activated, if the water heater is in the target operating condition, the load change rate of the water heater during the combustion process is calculated. The target operating condition includes gas filling condition, gas reduction condition, and underload condition. Based on the load change rate, determine whether the water heater is in a low-pressure state; If the water heater is in a low gas pressure state, record the effective opening value of the water heater at the current setting; Based on the effective opening value and the preset gas pressure adaptive database, the target gas pressure value is obtained; Based on the target gas pressure value, the matching parameters of each setting of the water heater are corrected, wherein the matching parameters include air volume parameters and gas volume parameters. The modified water heater continues to burn.

[0119] The storage medium is a physical, non-transient storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), magnetic disk, or optical disk, or any other physical storage medium capable of storing program code. The computer-readable storage medium can be non-volatile or volatile.

[0120] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this application.

[0121] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of each unit is merely a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0122] The steps in the methods of this application embodiment can be adjusted, merged, or deleted according to actual needs. The units in the apparatus of this application embodiment can be merged, divided, or deleted according to actual needs. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0123] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, a terminal, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0124] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0125] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0126] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A gas pressure adaptive control method for a water heater, characterized in that, The method includes: After the gas pressure adaptive function is activated, if the water heater is in the target operating condition, the load change rate of the water heater during the combustion process is calculated. The target operating condition includes gas filling condition, gas reduction condition, and underload condition. Based on the load change rate, determine whether the water heater is in a low-pressure state; If the water heater is in a low gas pressure state, record the effective opening value of the water heater at the current setting; Based on the effective opening value and the preset gas pressure adaptive database, the target gas pressure value is obtained; Based on the target gas pressure value, the matching parameters of each setting of the water heater are corrected, wherein the matching parameters include air volume parameters and gas volume parameters. The modified water heater continues to burn.

2. The method according to claim 1, characterized in that, Calculating the rate of load change during the combustion process includes: Obtain the load change and gas valve opening change of the water heater under the target operating conditions; Calculate the ratio of the load change to the valve opening change to obtain the load change rate.

3. The method according to claim 1, characterized in that, The process of obtaining the target gas pressure value based on the effective opening value and a preset adaptive gas pressure database includes: If there are multiple effective opening values, the effective opening value corresponding to the minimum value shall be selected as the target effective opening value. Based on the target effective opening value and the preset gas pressure adaptive database, the target gas pressure value is obtained.

4. The method according to claim 1, characterized in that, The step of determining whether the water heater is in a low-pressure state based on the load change rate includes: Determine whether the load change rate is less than a preset load change rate value; If the rate of load change is less than the preset rate of load change, the water heater is determined to be in a low-pressure state.

5. The method according to claim 1, characterized in that, After determining whether the water heater is in a low gas pressure state, the method further includes: When the water heater is in a low gas pressure state, and when it is detected that the combustion level is repeatedly switching between two adjacent segment levels, the two segment levels where the switching occurs are recorded. The number of gear shifts within a preset time window is counted. If the number of shifts reaches a preset threshold, the target gear is determined from the two gear segments. Lock the water heater's combustion setting to the target setting; When a change in water flow rate or a change in the preset target outlet water temperature is detected, the target setting will be automatically unlocked.

6. The method according to claim 1, characterized in that, The method further includes: If the water heater is in a low gas pressure state, then set the flag bit to 1; If the water heater is not in a low-pressure state, the flag bit is set to 0.

7. The method according to claim 6, characterized in that, After determining whether the water heater is in a low gas pressure state, the method further includes: Record the standby time of the water heater after the corrected combustion ends; When the water heater restarts combustion, it is determined whether the standby time is greater than the preset standby time. If not, return to the step of correcting the air parameters of the water heater at each setting based on the target gas pressure value. If so, set the low pressure flag p=0, exit the low pressure state, restore the matching parameters of each gear, and return to the step of determining whether the water heater is in a low pressure state.

8. A gas pressure adaptive control device for a water heater, characterized in that, Includes a unit for performing the method as described in any one of claims 1-7.

9. A computer device, characterized in that, The computer device includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program that, when executed by a processor, can implement the method as described in any one of claims 1-7.

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