An automatic calibration method and system for a proportional valve of a gas water heater

Abstract

The present application relates to an automatic calibration method and system for a proportional valve of a gas water heater, and relates to the technical field of gas water heaters. The method includes: determining a reference proportional valve current value corresponding to both a measured fire row number and a measured fire load and a reference temperature rise value at a reference water flow rate; controlling the fire row number of the gas water heater to be the measured fire row number, the water inlet volume to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtaining the actual temperature rise value of the gas water heater; if the actual temperature rise value and the reference temperature rise value do not meet a preset proximity condition, then adjusting the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and a preset proportional valve current adjustment strategy until the obtained actual temperature rise value and the reference temperature rise value meet the proximity condition. Using the present application can ensure the constant temperature effect of the gas water heater.

Description

Technical Field

[0001] The present application relates to the technical field of gas water heaters, and in particular, to an automatic calibration method and system for a proportional valve of a gas water heater. Background Art

[0002] Currently, existing gas water heaters are all constant-temperature gas water heaters, which can control the fire load of the gas water heater according to the water flow rate and the temperature rise value required for the target temperature set by the user (temperature rise value = target temperature - inlet water temperature), so as to heat the cold water to the target temperature set by the user. Among them, the control of the fire load is generally achieved by adjusting the proportional valve current value to adjust the proportional valve opening, and then adjusting the gas intake volume.

[0003] However, for different gas water heaters of the same model, there are differences in the gas intake volume and the fire load under the same proportional valve opening. Therefore, in order to ensure the constant-temperature effect of the gas water heater, an automatic calibration method for the proportional valve of the gas water heater is urgently needed. Summary of the Invention

[0004] Based on this, in view of the above technical problems, it is necessary to provide an automatic calibration method and system for a proportional valve of a gas water heater.

[0005] In a first aspect, an automatic calibration method for a proportional valve of a gas water heater is provided. The method includes:

[0006] Determine the reference proportional valve current value corresponding to the measured fire row number and the measured fire load, and the reference temperature rise value at the reference water flow rate;

[0007] Control the fire row number of the gas water heater to be the measured fire row number, the water inlet volume to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtain the actual temperature rise value of the gas water heater;

[0008] If the actual temperature rise value and the reference temperature rise value do not meet the preset proximity condition, then adjust the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, and repeat the step of controlling the fire row number of the gas water heater to be the measured fire row number, the water inlet volume to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtaining the actual temperature rise value of the gas water heater until the obtained actual temperature rise value and the reference temperature rise value meet the proximity condition.

[0009] As an optional implementation manner, the determining the reference proportional valve current value corresponding to the measured fire row number and the measured fire load, and the reference temperature rise value at the reference water flow rate includes:

[0010] In the pre-stored correspondence relationship among the number of firepower rows, the firepower load, and the proportional valve current value, query the reference proportional valve current value corresponding to both the measured number of firepower rows and the measured firepower load;

[0011] According to the measured firepower load, the reference water flow rate, and a preset heating coefficient, determine the reference temperature rise value of the measured firepower load at the reference water flow rate.

[0012] As an optional implementation manner, the formula for determining the reference temperature rise value of the measured firepower load at the reference water flow rate according to the measured firepower load, the reference water flow rate, and the preset heating coefficient is:

[0013] △T = P * k / L

[0014] Where, △T represents the reference temperature rise value, P represents the measured firepower load, k represents the heating coefficient, and L represents the reference water flow rate.

[0015] As an optional implementation manner, if the actual temperature rise value and the reference temperature rise value do not meet the preset proximity condition, then according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, adjust the reference proportional valve current value, including:

[0016] If the actual temperature rise value is greater than the sum of the reference temperature rise value and the first preset deviation, then determine the ratio of the difference between the actual temperature rise value and the reference temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current as the proportional valve current reduction value, and reduce the determined reference proportional valve current value by the proportional valve current reduction value;

[0017] If the actual temperature rise value is less than the difference between the reference temperature rise value and the second preset deviation, then determine the ratio of the difference between the reference temperature rise value and the actual temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current as the proportional valve current increase value, and increase the determined reference proportional valve current value by the proportional valve current increase value.

[0018] As an optional implementation manner, the method further includes:

[0019] At the measured number of firepower rows, determine the maximum reference proportional valve current value corresponding to the maximum firepower load and the maximum reference temperature rise value at the reference water flow rate;

[0020] At the measured number of firepower rows, determine the minimum reference proportional valve current value corresponding to the minimum firepower load and the minimum reference temperature rise value at the reference water flow rate;

[0021] The difference between the maximum reference temperature rise value and the minimum reference temperature rise value is divided by the difference between the maximum reference proportional valve current value and the minimum reference proportional valve current value, and the resulting value is determined as the temperature difference change corresponding to the unit proportional valve current for the number of firepower rows to be measured and the reference water flow rate.

[0022] As an optional implementation manner, after adjusting the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, the method further includes:

[0023] If the adjusted reference proportional valve current value exceeds the normal proportional valve current value range corresponding to the number of firepower rows to be measured and the firepower load to be measured, stop the calibration.

[0024] In a second aspect, an automatic calibration system for a proportional valve of a gas water heater is provided. The system includes an inlet water temperature sensor, an outlet water temperature sensor, a water regulating valve, a water flow sensor, and an automatic calibration control device;

[0025] The automatic calibration control device is configured to determine the reference proportional valve current value and the reference temperature rise value at the reference water flow rate corresponding to the number of firepower rows to be measured and the firepower load to be measured of the gas water heater to be measured;

[0026] The automatic calibration control device is further configured to control the number of firepower rows of the gas water heater to be measured to be the number of firepower rows to be measured, the proportional valve current value to be the determined reference proportional valve current value, and control the water inflow rate to be the reference water flow rate through the water regulating valve and the water flow sensor, and obtain the actual temperature rise value of the gas water heater to be measured through the inlet water temperature sensor and the outlet water temperature sensor;

[0027] The automatic calibration control device is further configured to, if the actual temperature rise value and the reference temperature rise value do not meet the preset proximity condition, adjust the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, and repeat the steps of controlling the number of firepower rows of the gas water heater to be measured to be the number of firepower rows to be measured, the proportional valve current value to be the determined reference proportional valve current value, and controlling the water inflow rate to be the reference water flow rate through the water regulating valve and the water flow sensor, and obtaining the actual temperature rise of the gas water heater to be measured through the inlet water temperature sensor and the outlet water temperature sensor until the obtained actual temperature rise value and the reference temperature rise value meet the proximity condition.

[0028] As an optional implementation manner, the automatic calibration control device is specifically configured to:

[0029] In the pre-stored correspondence relationship among the number of firepower rows, the firepower load, and the proportional valve current value of the gas water heater to be measured, query the reference proportional valve current value corresponding to the number of firepower rows to be measured and the firepower load to be measured;

[0030] According to the firepower load to be measured, the reference water flow rate, and a preset heating coefficient, determine the reference temperature rise value of the firepower load to be measured at the reference water flow rate.

[0031] As an optional implementation manner, the automatic calibration control device is specifically configured to:

[0032] If the actual temperature rise value is greater than the sum of the reference temperature rise value and the first preset deviation, then determine the ratio of the difference between the actual temperature rise value and the reference temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current as the proportional valve current reduction value, and reduce the determined reference proportional valve current value by the proportional valve current reduction value;

[0033] If the actual temperature rise value is less than the difference between the reference temperature rise value and the second preset deviation, then determine the ratio of the difference between the reference temperature rise value and the actual temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current as the proportional valve current increase value, and increase the determined reference proportional valve current value by the proportional valve current increase value.

[0034] As an optional implementation manner, the automatic calibration control device is further configured to:

[0035] At the number of firepower rows to be measured, determine the maximum reference proportional valve current value corresponding to the maximum firepower load and the maximum reference temperature rise value at the reference water flow rate;

[0036] At the number of firepower rows to be measured, determine the minimum reference proportional valve current value corresponding to the minimum firepower load and the minimum reference temperature rise value at the reference water flow rate;

[0037] Determine the ratio of the difference between the maximum reference temperature rise value and the minimum reference temperature rise value to the difference between the maximum reference proportional valve current value and the minimum reference proportional valve current value as the temperature difference change amount corresponding to the unit proportional valve current for the number of firepower rows to be measured and the reference water flow rate.

[0038] As an optional implementation manner, the automatic calibration control device is further configured to:

[0039] If the adjusted reference proportional valve current value exceeds the normal proportional valve current value range corresponding to the number of firepower rows to be measured and the firepower load to be measured, stop calibration.

[0040] In a third aspect, a gas water heater is provided. The gas water heater includes an inlet water temperature sensor, an outlet water temperature sensor, a water regulating valve, a water flow sensor, and a main control device;

[0041] The main control device is configured to determine a reference proportional valve current value corresponding to the number of firepower rows to be measured and the firepower load to be measured, and a reference temperature rise value at a reference water flow rate;

[0042] The main control device is further configured to control the number of firepower rows of the gas water heater to be the number of firepower rows to be measured, the proportional valve current value to be the determined reference proportional valve current value, and control the water inlet volume to be the reference water flow rate through the water regulating valve and the water flow sensor, and obtain the actual temperature rise value of the gas water heater through the inlet water temperature sensor and the outlet water temperature sensor;

[0043] The main control device is further configured to, if the actual temperature rise value and the reference temperature rise value do not meet a preset proximity condition, adjust the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and a preset proportional valve current adjustment strategy, and repeat the steps of controlling the number of firepower rows of the gas water heater to be the number of firepower rows to be measured, the proportional valve current value to be the determined reference proportional valve current value, and controlling the water inlet volume to be the reference water flow rate through the water regulating valve and the water flow sensor, and obtaining the actual temperature rise value of the gas water heater through the inlet water temperature sensor and the outlet water temperature sensor until the obtained actual temperature rise value and the reference temperature rise value meet the proximity condition.

[0044] As an optional implementation manner, the main control device is specifically configured to:

[0045] Query the reference proportional valve current value corresponding to the number of firepower rows to be measured and the firepower load to be measured in the pre-stored corresponding relationship among the number of firepower rows, the firepower load, and the proportional valve current value;

[0046] Determine the reference temperature rise value of the firepower load to be measured at the reference water flow rate according to the firepower load to be measured, the reference water flow rate, and a preset heating coefficient.

[0047] As an optional implementation manner, the main control device is specifically configured to:

[0048] If the actual temperature rise value is greater than the sum of the reference temperature rise value and a first preset deviation, then determine the ratio of the difference between the actual temperature rise value and the reference temperature rise value to the temperature difference change amount corresponding to a unit proportional valve current as the proportional valve current reduction value, and reduce the determined reference proportional valve current value by the proportional valve current reduction value;

[0049] If the actual temperature rise value is less than the difference between the reference temperature rise value and the second preset deviation, then the ratio of the difference between the reference temperature rise value and the actual temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current is determined as the proportional valve current increase value, and the determined reference proportional valve current value is increased by the proportional valve current increase value.

[0050] As an alternative implementation, the main control device is further configured to:

[0051] Under the number of rows of the measured firepower, determine the maximum reference proportional valve current value corresponding to the maximum firepower load and the maximum reference temperature rise value under the reference water flow rate;

[0052] Under the number of rows of the measured firepower, determine the minimum reference proportional valve current value corresponding to the minimum firepower load and the minimum reference temperature rise value under the reference water flow rate;

[0053] The ratio of the difference between the maximum reference temperature rise value and the minimum reference temperature rise value to the difference between the maximum reference proportional valve current value and the minimum reference proportional valve current value is determined as the temperature difference change amount corresponding to the unit proportional valve current corresponding to the number of rows of the measured firepower and the reference water flow rate.

[0054] As an alternative implementation, the main control device is further configured to:

[0055] If the adjusted reference proportional valve current value exceeds the normal proportional valve current value range corresponding to the number of rows of the measured firepower and the measured firepower load, stop the calibration.

[0056] In a fourth aspect, a computer device is provided, including a memory and a processor, where a computer program executable on the processor is stored on the memory, and when the processor executes the computer program, the method steps described in the first aspect are implemented.

[0057] In a fifth aspect, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the method steps described in the first aspect are implemented.

[0058] The present application provides an automatic calibration method and system for a proportional valve of a gas water heater. The technical solutions provided by the embodiments of the present application at least bring the following beneficial effects:

[0059] First, the automatic calibration control device determines the reference proportional valve current value and the reference temperature rise value at the reference water flow rate corresponding to both the number of firepower rows to be measured and the firepower load to be measured. Then, the automatic calibration control device controls the number of firepower rows of the gas water heater to be the number of firepower rows to be measured, the water intake to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtains the actual temperature rise value of the gas water heater. If the actual temperature rise value and the reference temperature rise value do not meet the preset proximity condition, the reference proportional valve current value needs to be calibrated. The automatic calibration control device adjusts the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, and repeats the steps of controlling the number of firepower rows of the gas water heater to be the number of firepower rows to be measured, the water intake to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtaining the actual temperature rise value of the gas water heater until the obtained actual temperature rise value and the reference temperature rise value meet the proximity condition. In this way, the calibration of the reference proportional valve current value can be achieved, so that the outlet water temperature of the gas water heater is stabilized at the target temperature set by the user, thereby ensuring the constant temperature effect of the gas water heater.

[0060] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0062] Figure 1 It is a schematic structural diagram of an automatic calibration system for a proportional valve of a gas water heater provided by an embodiment of this application;

[0063] Figure 2 It is a schematic diagram of the firepower load of a 2-4-6 segmented gas water heater provided by an embodiment of this application;

[0064] Figure 3 It is a schematic diagram of a firepower row control structure provided by an embodiment of this application;

[0065] Figure 4 It is a flowchart of an automatic calibration method for a proportional valve of a gas water heater provided by an embodiment of this application;

[0066] Figure 5 It is a schematic diagram of the structure of a computer device provided by an embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0067] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0068] The automatic calibration method for the proportional valve of a gas water heater provided by an embodiment of the present application can be applied to an automatic calibration system for the proportional valve of a gas water heater or a gas water heater to calibrate the proportional valve before or after the gas water heater leaves the factory. Figure 1 FIG. is a schematic structural diagram of an automatic calibration system for the proportional valve of a gas water heater provided by an embodiment of the present application. As Figure 1 shown, the automatic calibration system for the proportional valve of the gas water heater includes an inlet water temperature sensor 110, an outlet water temperature sensor 120, a water regulating valve 130, a water flow sensor 140, and an automatic calibration control device 150. The inlet water temperature sensor 110, the water regulating valve 130, and the water flow sensor 140 are arranged on the inlet pipeline of the gas water heater to be tested, and the outlet water temperature sensor 120 is arranged on the outlet pipeline of the gas water heater to be tested. After the gas water heater to be tested is connected to the automatic calibration system, the automatic calibration control device 150 determines the reference proportional valve current value corresponding to the number of firepower rows to be tested and the firepower load to be tested of the gas water heater to be tested and the reference temperature rise value under the reference water flow. Then, the automatic calibration control device 150 controls the number of firepower rows of the gas water heater to be tested to be the number of firepower rows to be tested, the proportional valve current value to be the determined reference proportional valve current value, and controls the water inflow to be the reference water flow through the water regulating valve 130 and the water flow sensor 140, and obtains the actual temperature rise value of the gas water heater to be tested through the inlet water temperature sensor 110 and the outlet water temperature sensor 120. If the actual temperature rise value and the reference temperature rise value do not meet the preset proximity condition, the automatic calibration control device 150 adjusts the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, and repeats the steps of controlling the number of firepower rows of the gas water heater to be tested to be the number of firepower rows to be tested, the proportional valve current value to be the determined reference proportional valve current value, and controlling the water inflow to be the reference water flow through the water regulating valve 130 and the water flow sensor 140, and obtaining the actual temperature rise value of the gas water heater to be tested through the inlet water temperature sensor 110 and the outlet water temperature sensor 120 until the obtained actual temperature rise value and the reference temperature rise value meet the proximity condition. During the process of calibrating the proportional valve after the gas water heater leaves the factory, the controller of the gas water heater itself realizes the calibration of the proportional valve by executing the processing process of the automatic calibration control device in the automatic calibration system for the proportional valve of the gas water heater.

[0069] For the convenience of understanding, the present application first introduces the control of the number of firepower rows, firepower load, and proportional valve current value of the gas water heater.

[0070] At present, gas water heaters with different loads have different ways of segmenting the number of firepower rows. For example, a gas water heater with a 2-4-6 segmentation method can use 2 rows, 4 rows, or 6 rows of fire to heat water. Figure 2 The following is a schematic diagram of the firepower load of a gas water heater with a 2-4-6 segmentation method provided by an embodiment of this application. As Figure 2 shown, in order to ensure the continuity of the firepower load between different segments, the maximum firepower load of 2 rows is greater than the minimum firepower load of 4 rows, and the maximum firepower load of 4 rows is greater than the minimum firepower load of 6 rows. Here, PL represents the minimum firepower load (i.e., the minimum proportional valve opening in this segment, corresponding to the minimum proportional valve current value), and PH represents the maximum firepower load (i.e., the maximum proportional valve opening in this segment, corresponding to the maximum proportional valve current value). It should be noted that although there is an overlapping area of the firepower load in different firepower row segments, the proportional valve openings corresponding to the same firepower load in different segments within the overlapping area are different, and the proportional valve current values are also different. Further, the number of firepower rows can be controlled by controlling the opening and closing of the solenoid valve inside the gas water heater. Figure 3 The following is a schematic diagram of a firepower row number control structure provided by an embodiment of this application. As Figure 3 shown, when both solenoid valve 1 and solenoid valve 2 are closed, the gas entering from the air inlet is adjusted by the proportional valve and then ejected from fire row 1 and fire row 2, and the number of firepower rows is 2 rows; when solenoid valve 1 is opened and solenoid valve 2 is closed, the gas is ejected from fire row 1 to fire row 4, and the number of firepower rows is 4 rows; when both solenoid valve 1 and solenoid valve 2 are opened, the gas is ejected from fire row 1 to fire row 6, and the number of firepower rows is 6 rows.

[0071] As an example, Table 1 shows the proportional valve current values corresponding to the maximum firepower load and the minimum firepower load within each firepower row of a gas water heater with a 2-4-6 segmentation method before factory calibration. Among them, although the minimum firepower loads of each segment are different and the maximum firepower loads are also different, the minimum proportional valve current values corresponding to the minimum firepower loads are the same, and the maximum proportional valve current values corresponding to the maximum firepower loads are also the same.

[0072] Table 1

[0073] Number of rows of firepower and PL, PH Firepower load / kw Proportional valve current value / mA 2 rows of PL 3 120 2 rows of PH 7 180 4 rows of PL 6 120 4 rows of PH 13 180 6 rows of PL 10 120 6 rows of PH 23 180

[0074] When a user actually uses a gas water heater, the user can set the target temperature of the outlet water according to their own needs. The gas water heater determines the target firepower load of the gas water heater based on the water flow rate and the temperature rise value required for the target temperature set by the user (temperature rise value = target temperature - inlet water temperature). Then, the gas water heater can determine the target firepower row number according to the target firepower load, and further query the reference proportional valve current value corresponding to both the target firepower row number and the target firepower load in the corresponding relationship among the pre-stored firepower row number, firepower load, and proportional valve current value as the target proportional valve current value. In this way, the gas water heater can control the gas water heater according to the target firepower row number and the target proportional valve current value, thereby controlling gas combustion.

[0075] However, since the corresponding relationship among the pre-stored firepower row number, firepower load, and proportional valve current value is generally obtained by engineering personnel testing the gas water heater under standard conditions set in the laboratory, and for different gas water heaters of the same model in actual application scenarios, there will still be differences in the gas intake volume and firepower load under the same firepower row number and proportional valve opening (proportional valve current value). Therefore, the target proportional valve current value determined according to the fixed corresponding relationship among the firepower row number, firepower load, and proportional valve current value may cause a large deviation between the outlet water temperature after the gas water heater heats the inlet water and the target temperature set by the user, and the constant temperature effect cannot be guaranteed.

[0076] Next, a method for automatically calibrating a proportional valve of a gas water heater provided in an embodiment of the present application will be described in detail in conjunction with specific embodiments. Figure 4 The following is a flowchart of a method for automatically calibrating a proportional valve of a gas water heater provided in an embodiment of the present application, as Figure 4 shown. The specific steps are as follows:

[0077] Step 401, determine the reference proportional valve current value corresponding to both the firepower row number to be measured and the firepower load to be measured and the reference temperature rise value under the reference water flow rate.

[0078] In implementation, after the user starts the gas water heater and sets the target temperature, the gas water heater can determine the target firepower load of the gas water heater according to the water flow rate, the inlet water temperature, and the target temperature set by the user, and determine the target firepower row number and the target proportional valve current value according to the target firepower load. In order to enable the gas water heater to heat the cold water with the inlet water temperature to the target temperature under the control of the determined target firepower row number and target proportional valve current value and achieve the constant temperature effect of the gas water heater, the embodiment of the present application calibrates the corresponding relationship among the firepower row number, firepower load, and proportional valve current value stored in the gas water heater.

[0079] During the calibration process, the automatic calibration control device first determines the reference proportional valve current values corresponding to the number of firepower rows to be measured and the firepower load to be measured, as well as the reference temperature rise value corresponding to the firepower load to be measured under the reference water flow rate. Among them, the reference proportional valve current values corresponding to the number of firepower rows to be measured and the firepower load to be measured can be determined according to the corresponding relationship among the number of firepower rows to be measured, the firepower load to be measured, and the pre-stored corresponding relationship among the number of firepower rows, the firepower load, and the proportional valve current value. The reference temperature rise value corresponding to the firepower load to be measured under the reference water flow rate can be set by the engineer according to experience and stored in the automatic calibration control device, or can be obtained by calculating the firepower load to be measured and the reference water flow rate. Preferably, the reference water flow rate is set by the engineer according to experience and stored in the automatic calibration control device. For example, the reference water flow rate is 10 L / min. It should be noted that when the reference proportional valve current value is accurate, under the control of the number of firepower rows to be measured and the reference proportional valve current value, the actual temperature rise value after heating the water inlet with the reference water flow rate by the gas water heater is equal to the reference temperature rise value.

[0080] As an alternative implementation, the processing procedure for the automatic calibration control device to determine the reference proportional valve current value corresponding to the number of firepower rows to be measured and the firepower load to be measured and the reference temperature rise value under the reference water flow rate is as follows:

[0081] Step 1: In the corresponding relationship among the pre-stored number of firepower rows, the firepower load, and the proportional valve current value, query the reference proportional valve current value corresponding to the number of firepower rows to be measured and the firepower load to be measured.

[0082] In practice, the automatic calibration control device can query the reference proportional valve current value corresponding to the number of firepower rows to be measured and the firepower load to be measured in the corresponding relationship among the pre-stored number of firepower rows, the firepower load, and the proportional valve current value. For example, referring to Table 1, if the number of firepower rows to be measured is 2 rows and the firepower load to be measured is 3 kw, the queried reference proportional valve current value is 120 mA; if the number of firepower rows to be measured is 2 rows and the firepower load to be measured is 7 kw, the queried reference proportional valve current value is 180 mA.

[0083] Step 2: Determine the reference temperature rise value of the firepower load to be measured under the reference water flow rate according to the firepower load to be measured, the reference water flow rate, and the preset heating coefficient.

[0084] In implementation, the heating load can be determined by the water flow rate, target temperature, inlet water temperature, and heating coefficient. The formula is: Heating load = Water flow rate * (Target temperature - Inlet water temperature) / Heating coefficient. Among them, when the primary gas pressure is at the normal pressure (i.e., the natural gas inlet pressure is 2000 Pa), the heating coefficient takes a value of 14, indicating that for a heating load of 1 kw, the maximum temperature of the inlet water with a water flow rate of 1 L / min can be increased by 14 °C. When the primary pressure is on the high side, the heating coefficient is greater than 14. When the primary pressure is on the low side, the heating coefficient is greater than 14.

[0085] Therefore, the automatic calibration control device can determine the reference temperature rise value of the measured heating load at the reference water flow rate according to the measured heating load, reference water flow rate, and preset heating coefficient. Among them, the formula for determining the reference temperature rise value is:

[0086] △T = P * k / L

[0087] Among them, △T represents the reference temperature rise value, P represents the measured heating load, k represents the heating coefficient, and L represents the reference water flow rate. For example, Table 2 shows the reference temperature rise values and calculation processes corresponding to the maximum and minimum heating loads in each row of the heating fire for a gas water heater with a 2-4-6 segmentation method under the condition that the heating coefficient is 14 and the reference water flow rate is 10 L / min. As shown in Table 2, if the measured heating load is 3 kw, then the reference temperature rise value = 3 * 14 / 10 = 4.2 °C.

[0088] Table 2

[0089] Number of rows of firepower and PL, PH Firepower load / kw Reference temperature rise value / ℃ 2 rows of PL 3 3*14 / 10＝4.2 2 rows of PH 7 7*14 / 10＝9.8 4 rows of PL 6 6*14 / 10＝8.4 4 rows of PH 13 13*14 / 10＝18.2 6 rows of PL 10 10*14 / 10＝14 6 rows of PH 23 23*14 / 10＝32.2

[0090] Step 402, control the number of rows of the heating fire of the gas water heater to be the measured number of rows of the heating fire, the water inlet volume to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtain the actual temperature rise value of the gas water heater.

[0091] In implementation, the automatic calibration control device first controls the water inflow of the gas water heater to be stable at the reference water flow rate. At this time, the gas water heater ignites and burns according to the default control logic. After receiving the signal that the flame is burning normally, the automatic calibration control device controls the number of firepower rows of the gas water heater to be the number of firepower rows to be measured, the proportional valve current value to be the determined reference proportional valve current value, and obtains the actual temperature rise value of the gas water heater. Among them, the automatic calibration control device can obtain the current water flow of the water circuit through the water flow sensor, and adjust the opening of the water regulating valve arranged on the water inlet pipe through the stepping motor, so as to adjust the opening of the water circuit, thereby controlling the water inflow to be the reference water flow rate. Further, the automatic calibration control device can obtain the inlet water temperature of the gas water heater through the inlet water temperature sensor, obtain the outlet water temperature of the gas water heater through the outlet water temperature sensor, and determine the difference between the outlet water temperature and the inlet water temperature as the actual temperature rise value of the gas water heater. In this way, the automatic calibration control device can accurately obtain the actual temperature rise value after heating the inlet water with the reference water flow rate under the current control conditions of the gas water heater (that is, the number of firepower rows is the number of firepower rows to be measured, the water inflow is the reference water flow rate, and the proportional valve current value is the determined reference proportional valve current value).

[0092] It should be noted that, in order to ensure the stable opening of the proportional valve during combustion and the accurate and stable obtained inlet water temperature and outlet water temperature, preferably, after the automatic calibration control device controls the number of firepower rows of the gas water heater to be the number of firepower rows to be measured and the proportional valve current value to be the determined reference proportional valve current value, it judges whether the combustion has lasted for a preset duration (such as 10 seconds), and obtains the inlet water temperature and outlet water temperature of the gas water heater after judging that the combustion has lasted for the preset duration.

[0093] Step 403, if the actual temperature rise value and the reference temperature rise value do not meet the preset proximity condition, then according to the obtained actual temperature rise value, the determined reference temperature rise value and the preset proportional valve current adjustment strategy, adjust the reference proportional valve current value, and repeat the steps of controlling the number of firepower rows of the gas water heater to be the number of firepower rows to be measured, the water inflow to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtaining the actual temperature rise value of the gas water heater until the obtained actual temperature rise value and the reference temperature rise value meet the proximity condition.

[0094] In implementation, if the actual temperature rise value does not meet the preset proximity condition with the reference temperature rise value, it indicates that when the number of firing rows is the number of target firing rows to be measured and the proportional valve current value is the reference proportional valve current value, the deviation between the actual temperature rise value after the gas water heater heats the incoming water with the reference water flow and the reference temperature rise value is large, and the target temperature cannot be kept constant at the outlet water temperature. Therefore, the automatic calibration control device needs to calibrate the reference proportional valve current values corresponding to both the number of target firing rows to be measured and the target heating load to be measured: according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, adjust the reference proportional valve current value. After adjusting the reference proportional valve current value, the automatic calibration control device repeats step 402 until the obtained actual temperature rise value meets the proximity condition with the reference temperature rise value, that is, the calibration of the reference proportional valve current value is completed.

[0095] Among them, the proximity condition between the actual temperature rise value and the reference temperature rise value can be set by engineers according to experience and stored in the automatic calibration control device. For example, the proximity condition is that the deviation between the actual temperature rise value and the reference temperature rise value is within ±10%, that is, the absolute value of the difference between the actual temperature rise value and the reference temperature rise value is less than 10% of the reference temperature rise value. For example, if the reference temperature rise value is 4.2 °C, if the actual temperature rise value is between 4.2 ± 0.42 °C, then the actual temperature rise value meets the proximity condition with the reference temperature rise value, otherwise it does not meet the proximity condition. It should be noted that in the proximity condition, the larger the set deviation between the actual temperature rise value and the reference temperature rise value, the faster the calibration speed.

[0096] Furthermore, in order to make the actual temperature rise value obtained after adjusting the proportional valve current meet the proximity condition with the reference temperature rise value, the proportional valve current adjustment strategy can be: if the actual temperature rise value is less than the reference temperature rise value, increase the reference proportional valve current value to increase the proportional valve opening, and then increase the gas intake; if the actual temperature rise value is greater than the reference temperature rise value, decrease the reference proportional valve current value to decrease the proportional valve opening, and then decrease the gas intake. Among them, the increased value and decreased value of the reference proportional valve current value can be preset fixed values, or can be calculated according to the actual temperature rise value and the reference temperature rise value.

[0097] It should be noted that since the output heating load of the gas water heater = water flow * actual temperature rise value / heating coefficient, and the target heating load to be measured = water flow * reference temperature rise value / heating coefficient, therefore, in the embodiments of the present application, calibrating the reference proportional valve current value according to the actual temperature rise value and the reference temperature rise value can make the output heating load of the gas water heater approach the target heating load to be measured from the perspective of the actual water production of the gas water heater, which is more in line with the actual hot water usage scenario of users.

[0098] As an alternative implementation, if the actual temperature rise value and the reference temperature rise value do not meet the preset proximity condition, the process of adjusting the reference proportional valve current value by the automatic calibration control device according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy is as follows:

[0099] Step 1, if the actual temperature rise value is greater than the sum of the reference temperature rise value and the first preset deviation, then the ratio of the difference between the actual temperature rise value and the reference temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current is determined as the proportional valve current reduction value, and the determined reference proportional valve current value is reduced by the proportional valve current reduction value.

[0100] In implementation, the preset proximity condition is that the actual temperature rise value is less than or equal to the sum of the reference temperature rise value and the first preset deviation, and the actual temperature rise value is greater than or equal to the difference between the reference temperature rise value and the second preset deviation. Since under the same row of firing power, it can be approximately considered that the proportional valve current value and the temperature rise value are linearly related. Therefore, in order to accelerate the calibration speed, if the actual temperature rise value is greater than the sum of the reference temperature rise value and the first preset deviation, then the ratio of the difference between the actual temperature rise value and the reference temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current is determined as the proportional valve current reduction value, and the determined reference proportional valve current value is reduced by the proportional valve current reduction value, so that the actual temperature rise value approaches the reference temperature rise value. Among them, the temperature difference change amount corresponding to the unit proportional valve current can be set by engineers according to experience and stored in the automatic calibration control device, or can be calculated by the automatic calibration control device through the proportional valve current value and the reference temperature rise value.

[0101] Step 2, if the actual temperature rise value is less than the difference between the reference temperature rise value and the second preset deviation, then the ratio of the difference between the reference temperature rise value and the actual temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current is determined as the proportional valve current increase value, and the determined reference proportional valve current value is increased by the proportional valve current increase value.

[0102] In implementation, in order to accelerate the calibration speed, if the actual temperature rise value is less than the difference between the reference temperature rise value and the second preset deviation, then the ratio of the difference between the reference temperature rise value and the actual temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current is determined as the proportional valve current increase value, and the determined reference proportional valve current value is increased by the proportional valve current increase value, so that the actual temperature rise value approaches the reference temperature rise value.

[0103] As an alternative implementation, the process of the automatic calibration control device determining the temperature difference change amount corresponding to the unit proportional valve current further includes:

[0104] Step 1: Under the number of firepower rows to be measured, determine the maximum reference proportional valve current value corresponding to the maximum firepower load and the maximum reference temperature rise value at the reference water flow rate.

[0105] In implementation, the automatic calibration control device can query, in the pre-stored correspondence relationship among the number of firepower rows, the firepower load, and the proportional valve current value, the maximum reference proportional valve current value corresponding to the maximum firepower load under the number of firepower rows to be measured, and determine the maximum reference temperature rise value of the maximum firepower load at the reference water flow rate according to the maximum firepower load, the reference water flow rate, and the preset heating coefficient. For example, when the number of firepower rows to be measured is 2 rows, the maximum firepower load is 7 kw, the reference water flow rate is 10 L / min, the corresponding maximum reference proportional valve current value is 180 mA, and the maximum reference temperature rise value at the reference water flow rate is 9.8 °C.

[0106] Step 2: Under the number of firepower rows to be measured, determine the minimum reference proportional valve current value corresponding to the minimum firepower load and the minimum reference temperature rise value at the reference water flow rate.

[0107] In implementation, the automatic calibration control device can query, in the pre-stored correspondence relationship among the number of firepower rows, the firepower load, and the proportional valve current value, the minimum reference proportional valve current value corresponding to the minimum firepower load under the number of firepower rows to be measured, and determine the minimum reference temperature rise value of the minimum firepower load at the reference water flow rate according to the minimum firepower load, the reference water flow rate, and the preset heating coefficient. For example, when the number of firepower rows to be measured is 2 rows, the minimum firepower load is 3 kw, the reference water flow rate is 10 L / min, the corresponding minimum reference proportional valve current value is 120 mA, and the minimum reference temperature rise value at the reference water flow rate is 4.2 °C.

[0108] Step 3: Determine the temperature difference change amount corresponding to the unit proportional valve current for the number of firepower rows to be measured and the reference water flow rate by taking the ratio of the difference between the maximum reference temperature rise value and the minimum reference temperature rise value to the difference between the maximum reference proportional valve current value and the minimum reference proportional valve current value.

[0109] In implementation, the automatic calibration control device determines the temperature difference change amount corresponding to the unit proportional valve current for the number of firepower rows to be measured and the reference water flow rate by taking the ratio of the difference between the maximum reference temperature rise value and the minimum reference temperature rise value to the difference between the maximum reference proportional valve current value and the minimum reference proportional valve current value. For example, Table 3 shows the temperature difference change amount corresponding to the unit proportional valve current under each firepower row and the calculation process for a gas water heater with a 2-4-6 segmentation method when the heating coefficient is 14 and the reference water flow rate is 10 L / min. As shown in Table 3, when the number of firepower rows is 2 rows, the temperature difference change amount corresponding to the unit proportional valve current = (9.8 - 4.2) / (180 - 120) = 0.09 °C, that is, the temperature difference change amount corresponding to each 1 mA adjustment is 0.09 °C. In this way, the temperature difference change amount corresponding to the unit proportional valve current can be estimated more accurately, improving the calibration efficiency.

[0110] Table 3

[0111]

[0112] As an optional implementation manner, after adjusting the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, the processing process of the automatic calibration control device further includes:

[0113] If the adjusted reference proportional valve current value exceeds the normal proportional valve current value range corresponding to the number of firepower rows to be measured and the firepower load to be measured, stop the calibration.

[0114] In implementation, if the adjusted reference proportional valve current value exceeds the normal proportional valve current value range corresponding to the number of firepower rows to be measured and the firepower load to be measured, it indicates that there may be a problem with the structure of the proportional valve or the calibration process. The automatic calibration control device stops the calibration and outputs an error prompt message. For example, Table 4 shows the normal proportional valve current value range corresponding to the maximum firepower load and the minimum firepower load within each firepower row of a gas water heater with a 2-4-6 segmentation method. As shown in Table 4, when the number of firepower rows to be measured is 2 rows and the firepower load to be measured is 3 kw, the corresponding normal proportional valve current value range is 110 mA to 130 mA. If the adjusted reference proportional valve current value is 140 mA, the automatic calibration control device stops the calibration and outputs an error prompt message.

[0115] Table 4

[0116] Number of rows of firepower and PL, PH Firepower load / kw Normal proportional valve current value range / mA 2 rows of PL 3 110～130 2 rows of PH 7 170～190 4 rows of PL 6 110～130 4 rows of PH 13 160～180 6 rows of PL 10 110～130 6 rows of PH 23 160～180

[0117] For ease of understanding, an example of an automatic calibration method for a proportional valve of a gas water heater is provided in an embodiment of the present application:

[0118] During the calibration of the proportional valve before the gas water heater leaves the factory, the automatic calibration control device calibrates the minimum reference proportional valve current value corresponding to PL and the maximum reference proportional valve current value corresponding to PH in each fire row segment in turn to improve the accuracy of the gas water heater's control of the fire load. Among them, when the heating coefficient is 14 and the reference water flow rate is 10 L / min, the fire load, reference temperature rise value, proportional valve current value, temperature difference change amount corresponding to unit proportional valve current, and normal proportional valve current value range corresponding to PL and PH in each fire row segment are shown in Tables 3 and 4. The proximity condition is that the deviation between the actual temperature rise value and the reference temperature rise value is within ±10%. The calibration sequence is: 2-row PL - 2-row PH - 4-row PL - 4-row PH - 6-row PL - 6-row PH. Then the calibration process of the proportional valve is as follows:

[0119] Step 1, control the water flow rate of the gas water heater to be stable at the reference water flow rate (10 L / min), and the gas water heater ignites and burns according to the default control logic;

[0120] Step 2, after detecting that the flame is burning normally, control the proportional valve current value to be the minimum reference proportional valve current value (120 mA) corresponding to 2-row PL, and both solenoid valve 1 and solenoid valve 2 are closed, and enter the proportional valve calibration of 2-row PL;

[0121] Step 2.1, after judging that the combustion has proceeded for 10 seconds, obtain the actual temperature rise value T1 of the gas water heater;

[0122] Step 2.2, if T1 > 4.2 + 0.42, it means that the actual temperature rise value is higher than the reference temperature rise value. Reduce the minimum reference proportional valve current value by the proportional valve current reduction value. The proportional valve current reduction value = (T1 - 4.2) / 0.09 mA, and execute Step 2.1;

[0123] Step 2.3, if T1 < 4.2 - 0.42, it means that the actual temperature rise value is lower than the reference temperature rise value. Increase the minimum reference proportional valve current value by the proportional valve current increase value. The proportional valve current increase value = (4.2 - T1) / 0.09 mA, and execute Step 2.1;

[0124] Step 2.4, if 4.2 - 0.42 <= T1 <= 4.2 + 0.42, it means that the actual temperature rise value and the reference temperature rise value meet the proximity condition. Record the current minimum reference proportional valve current value A1. Further judge whether A1 exceeds the normal proportional valve current value range (110 mA - 130 mA) corresponding to 2-row PL. If it does not exceed, the proportional valve calibration of 2-row PL is completed, and execute Step 3. Otherwise, stop the calibration and output an error prompt message;

[0125] Step 3: Control the current value of the proportional valve to the maximum reference proportional valve current value corresponding to 2-row PH (180 mA), close both solenoid valve 1 and solenoid valve 2, and enter the proportional valve calibration for 2-row PH;

[0126] Step 3.1: After judging that the combustion has proceeded for 10 seconds, obtain the actual temperature rise value T2 of the gas water heater;

[0127] Step 3.2: If T2 > 9.8 + 0.98, indicating that the actual temperature rise value is higher than the reference temperature rise value, reduce the maximum reference proportional valve current value by the proportional valve current reduction value. The proportional valve current reduction value = (T2 - 9.8) / 0.09 mA, and execute Step 3.1;

[0128] Step 3.3: If T2 < 9.8 - 0.98, indicating that the actual temperature rise value is lower than the reference temperature rise value, increase the maximum reference proportional valve current value by the proportional valve current increase value. The proportional valve current increase value = (9.8 - T2) / 0.09 mA, and execute Step 3.1;

[0129] Step 3.4: If 9.8 - 0.98 <= T2 <= 9.8 + 0.98, indicating that the actual temperature rise value and the reference temperature rise value meet the proximity condition, record the current maximum reference proportional valve current value A2; further judge whether A2 exceeds the normal proportional valve current value range corresponding to 2-row PH (170 mA - 190 mA). If it does not exceed, the proportional valve calibration for 2-row PH is completed, and execute Step 4. Otherwise, stop the calibration and output an error prompt message;

[0130] Steps 4 - 7 respectively perform the proportional valve calibration for 4-row PL, 4-row PH, 6-row PL, and 6-row PH. The process will not be elaborated here.

[0131] The embodiment of the present application provides an automatic calibration method for a proportional valve of a gas water heater. First, the automatic calibration control device determines the reference proportional valve current value corresponding to the number of measured firepower rows and the measured firepower load, and the reference temperature rise value at the reference water flow rate. Then, the automatic calibration control device controls the number of firepower rows of the gas water heater to be the number of measured firepower rows, the water inlet volume to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtains the actual temperature rise value of the gas water heater. If the actual temperature rise value and the reference temperature rise value do not meet the preset proximity condition, the reference proportional valve current value needs to be calibrated. The automatic calibration control device adjusts the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, and repeats the steps of controlling the number of firepower rows of the gas water heater to be the number of measured firepower rows, the water inlet volume to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtaining the actual temperature rise value of the gas water heater until the obtained actual temperature rise value and the reference temperature rise value meet the proximity condition. In this way, the calibration of the reference proportional valve current value can be realized, so that the outlet water temperature of the gas water heater is stabilized at the target temperature set by the user, thereby ensuring the constant temperature effect of the gas water heater.

[0132] It should be understood that although Figure 4 the steps in the flowchart are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, Figure 4 at least a part of the steps in

[0133] can include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of the steps or stages in other steps or other steps.

[0134] The embodiment of the present application also provides an automatic calibration system for a proportional valve of a gas water heater. As Figure 1 shown, the system includes an inlet water temperature sensor 110, an outlet water temperature sensor 120, a water regulating valve 130, a water flow sensor 140, and an automatic calibration control device 150;

[0135] An automatic calibration control device 150 is used to determine the reference proportional valve current value and the reference temperature rise value at the reference water flow rate corresponding to the measured number of burner rows and the measured burner load of the gas water heater to be measured;

[0136] The automatic calibration control device 150 is further used to control the number of burner rows of the gas water heater to be measured as the measured number of burner rows, the proportional valve current value as the determined reference proportional valve current value, and control the water inlet flow rate as the reference water flow rate through the water regulating valve 130 and the water flow sensor 140, and obtain the actual temperature rise value of the gas water heater to be measured through the inlet water temperature sensor 110 and the outlet water temperature sensor 120;

[0137] The automatic calibration control device 150 is further used to, if the actual temperature rise value and the reference temperature rise value do not meet the preset proximity condition, adjust the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, and repeat the steps of controlling the number of burner rows of the gas water heater to be measured as the measured number of burner rows, the proportional valve current value as the determined reference proportional valve current value, and controlling the water inlet flow rate as the reference water flow rate through the water regulating valve 130 and the water flow sensor 140, and obtaining the actual temperature rise value of the gas water heater to be measured through the inlet water temperature sensor 110 and the outlet water temperature sensor 120 until the obtained actual temperature rise value and the reference temperature rise value meet the proximity condition.

[0138] In implementation, the inlet water temperature sensor is a high-precision inlet water temperature sensor, the outlet water temperature sensor is a high-precision outlet water temperature sensor, the water flow sensor is a high-precision water flow sensor, the gas water heater to be measured includes a main control device, and the automatic calibration control device communicates with the main control device of the gas water heater to be measured to automatically calibrate the proportional valve of the gas water heater.

[0139] As an optional implementation manner, the automatic calibration control device is specifically used for:

[0140] In the pre-stored correspondence relationship among the number of burner rows, the burner load, and the proportional valve current value of the gas water heater to be measured, query the reference proportional valve current value corresponding to the measured number of burner rows and the measured burner load;

[0141] According to the measured burner load, the reference water flow rate, and the preset heating coefficient, determine the reference temperature rise value of the measured burner load at the reference water flow rate.

[0142] As an optional implementation manner, the automatic calibration control device is specifically used for:

[0143] If the actual temperature rise value is greater than the sum of the reference temperature rise value and the first preset deviation, then the ratio of the difference between the actual temperature rise value and the reference temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current is determined as the proportional valve current reduction value, and the determined reference proportional valve current value is reduced by the proportional valve current reduction value;

[0144] If the actual temperature rise value is less than the difference between the reference temperature rise value and the second preset deviation, then the ratio of the difference between the reference temperature rise value and the actual temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current is determined as the proportional valve current increase value, and the determined reference proportional valve current value is increased by the proportional valve current increase value.

[0145] As an optional implementation manner, the automatic calibration control device is further configured to:

[0146] Under the number of firepower rows to be measured, determine the maximum reference proportional valve current value corresponding to the maximum firepower load and the maximum reference temperature rise value under the reference water flow rate;

[0147] Under the number of firepower rows to be measured, determine the minimum reference proportional valve current value corresponding to the minimum firepower load and the minimum reference temperature rise value under the reference water flow rate;

[0148] The ratio of the difference between the maximum reference temperature rise value and the minimum reference temperature rise value to the difference between the maximum reference proportional valve current value and the minimum reference proportional valve current value is determined as the temperature difference change amount corresponding to the unit proportional valve current corresponding to the number of firepower rows to be measured and the reference water flow rate.

[0149] As an optional implementation manner, the automatic calibration control device is further configured to:

[0150] If the adjusted reference proportional valve current value exceeds the normal proportional valve current value range corresponding to the number of firepower rows to be measured and the firepower load to be measured, stop the calibration.

[0151] An embodiment of the present application provides an automatic calibration system for a proportional valve of a gas water heater. The automatic calibration control device determines the reference proportional valve current value corresponding to the number of firepower rows to be measured and the firepower load to be measured, and the reference temperature rise value at the reference water flow rate. Then, the automatic calibration control device controls the number of firepower rows of the gas water heater to be the number of firepower rows to be measured, the water inlet volume to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtains the actual temperature rise value of the gas water heater. If the actual temperature rise value and the reference temperature rise value do not meet the preset proximity condition, the reference proportional valve current value needs to be calibrated. The automatic calibration control device adjusts the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, and repeats the steps of controlling the number of firepower rows of the gas water heater to be the number of firepower rows to be measured, the water inlet volume to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtaining the actual temperature rise value of the gas water heater until the obtained actual temperature rise value and the reference temperature rise value meet the proximity condition. In this way, the calibration of the reference proportional valve current value can be realized, so that the outlet water temperature of the gas water heater to be measured is stabilized at the target temperature set by the user, thereby ensuring the constant temperature effect of the gas water heater.

[0152] For the specific limitations of the automatic calibration system of the proportional valve of the gas water heater, reference can be made to the limitations of the automatic calibration method of the gas water heater in the above text, which will not be elaborated here. Each module in the above automatic calibration system of the proportional valve of the gas water heater can be implemented in whole or in part by software, hardware, and their combination. The above-mentioned modules can be embedded in the processor of the computer device in the form of hardware or independent of it, or stored in the memory of the computer device in the form of software, so as to facilitate the processor to call and execute the operations corresponding to the above-mentioned modules.

[0153] An embodiment of the present application also provides a gas water heater, which includes an inlet water temperature sensor, an outlet water temperature sensor, a water regulating valve, a water flow sensor, and a main control device;

[0154] The main control device is used to determine the reference proportional valve current value corresponding to the number of firepower rows to be measured and the firepower load to be measured, and the reference temperature rise value at the reference water flow rate;

[0155] The main control device is further used to control the number of firepower rows of the gas water heater to be the number of firepower rows to be measured, the proportional valve current value to be the determined reference proportional valve current value, and control the water inlet volume to be the reference water flow rate through the water regulating valve and the water flow sensor, and obtain the actual temperature rise value of the gas water heater through the inlet water temperature sensor and the outlet water temperature sensor;

[0156] The master control device is further configured to, if the actual temperature rise value does not meet the preset proximity condition with the reference temperature rise value, adjust the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, and repeatedly execute the steps of controlling the number of firing rows of the gas water heater to be the number of firing rows to be measured, the proportional valve current value to be the determined reference proportional valve current value, and controlling the water inflow to be the reference water flow through the water regulating valve and the water flow sensor, and obtaining the actual temperature rise value of the gas water heater through the water inlet temperature sensor and the water outlet temperature sensor until the obtained actual temperature rise value meets the proximity condition with the reference temperature rise value.

[0157] As an optional implementation manner, the master control device is specifically configured to:

[0158] In the corresponding relationship among the number of firing rows, the firing load, and the proportional valve current value stored in advance, query the reference proportional valve current value corresponding to both the number of firing rows to be measured and the firing load to be measured;

[0159] According to the firing load to be measured, the reference water flow, and the preset heating coefficient, determine the reference temperature rise value of the firing load to be measured under the reference water flow.

[0160] As an optional implementation manner, the master control device is specifically configured to:

[0161] If the actual temperature rise value is greater than the sum value of the reference temperature rise value and the first preset deviation, then determine the ratio of the difference between the actual temperature rise value and the reference temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current as the proportional valve current reduction value, and reduce the determined reference proportional valve current value by the proportional valve current reduction value;

[0162] If the actual temperature rise value is less than the difference between the reference temperature rise value and the second preset deviation, then determine the ratio of the difference between the reference temperature rise value and the actual temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current as the proportional valve current increase value, and increase the determined reference proportional valve current value by the proportional valve current increase value.

[0163] As an optional implementation manner, the master control device is further configured to:

[0164] Under the number of firing rows to be measured, determine the maximum reference proportional valve current value corresponding to the maximum firing load and the maximum reference temperature rise value under the reference water flow;

[0165] Under the number of firing rows to be measured, determine the minimum reference proportional valve current value corresponding to the minimum firing load and the minimum reference temperature rise value under the reference water flow;

[0166] The difference between the maximum reference temperature rise value and the minimum reference temperature rise value is divided by the difference between the maximum reference proportional valve current value and the minimum reference proportional valve current value, and the resulting ratio is determined as the temperature difference change corresponding to the unit proportional valve current for the number of firepower rows to be measured and the reference water flow rate.

[0167] As an optional implementation, the main control device is further configured to:

[0168] If the adjusted reference proportional valve current value exceeds the normal proportional valve current value range corresponding to the number of firepower rows to be measured and the firepower load to be measured, the calibration is stopped.

[0169] In the embodiment of the present application, a gas water heater is provided. The main control device determines the reference temperature rise value at the reference proportional valve current value and the reference water flow rate corresponding to the number of firepower rows to be measured and the firepower load to be measured. Then, the main control device controls the number of firepower rows of the gas water heater to be the number of firepower rows to be measured, the water inlet volume to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtains the actual temperature rise value of the gas water heater. If the actual temperature rise value and the reference temperature rise value do not meet the preset proximity condition, the reference proportional valve current value needs to be calibrated. The main control device adjusts the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, and repeats the steps of controlling the number of firepower rows of the gas water heater to be the number of firepower rows to be measured, the water inlet volume to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtaining the actual temperature rise value of the gas water heater until the obtained actual temperature rise value and the reference temperature rise value meet the proximity condition. In this way, the calibration of the reference proportional valve current value can be realized, the outlet water temperature of the gas water heater can be stabilized at the target temperature set by the user, and the constant temperature effect of the gas water heater can be ensured.

[0170] For the specific limitations of the gas water heater, reference can be made to the limitations of the automatic calibration method of the gas water heater in the above text, which will not be elaborated here. Each module in the above gas water heater can be implemented in whole or in part by software, hardware, and their combinations. The above modules can be embedded in the processor in the computer device in the form of hardware or be independent of it, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above respective modules.

[0171] In one embodiment, a computer device is provided, as Figure 5 shown, including a memory and a processor. A computer program that can run on the processor is stored on the memory. When the processor executes the computer program, the method steps for automatic calibration of the above gas water heater are implemented.

[0172] In one embodiment, a computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for automatically calibrating the above-mentioned gas water heater are implemented.

[0173] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in this application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0174] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including an..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0175] It should also be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for display, data for analysis, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0176] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple. For the relevant parts, reference can be made to the description of the method embodiment.

[0177] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0178] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. An automatic calibration method for a proportional valve of a gas water heater, characterized in that The method includes: Determining a reference proportional valve current value and a reference temperature rise value at a reference water flow rate corresponding to the number of firepower rows to be measured and the firepower load to be measured; Controlling the number of firepower rows of the gas water heater to be the number of firepower rows to be measured, the water inlet volume to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtaining the actual temperature rise value of the gas water heater; If the actual temperature rise value and the reference temperature rise value do not meet a preset proximity condition, then according to the obtained actual temperature rise value, the determined reference temperature rise value, and a preset proportional valve current adjustment strategy, adjust the reference proportional valve current value, and repeat the step of controlling the number of firepower rows of the gas water heater to be the number of firepower rows to be measured, the water inlet volume to be the reference water flow rate, and the proportional valve current value to be the determined reference proportional valve current value, and obtaining the actual temperature rise value of the gas water heater until the obtained actual temperature rise value and the reference temperature rise value meet the proximity condition; The step of if the actual temperature rise value and the reference temperature rise value do not meet a preset proximity condition, then according to the obtained actual temperature rise value, the determined reference temperature rise value, and a preset proportional valve current adjustment strategy, adjust the reference proportional valve current value, includes: If the actual temperature rise value is greater than the sum of the reference temperature rise value and a first preset deviation, then determine the ratio of the difference between the actual temperature rise value and the reference temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current as the proportional valve current reduction value, and reduce the determined reference proportional valve current value by the proportional valve current reduction value; If the actual temperature rise value is less than the difference between the reference temperature rise value and a second preset deviation, then determine the ratio of the difference between the reference temperature rise value and the actual temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current as the proportional valve current increase value, and increase the determined reference proportional valve current value by the proportional valve current increase value.

2. The method according to claim 1, wherein The step of determining a reference proportional valve current value and a reference temperature rise value at a reference water flow rate corresponding to the number of firepower rows to be measured and the firepower load to be measured includes: Querying the reference proportional valve current value corresponding to the number of firepower rows to be measured and the firepower load to be measured in the pre-stored corresponding relationship among the number of firepower rows, the firepower load, and the proportional valve current value; Determining the reference temperature rise value of the firepower load to be measured at the reference water flow rate according to the firepower load to be measured, the reference water flow rate, and a preset heating coefficient.

3. The method according to claim 2, characterized in that The formula for determining the reference temperature rise value of the firepower load to be measured at the reference water flow rate according to the firepower load to be measured, the reference water flow rate, and a preset heating coefficient is: ； Where, △T represents the reference temperature rise value, P represents the firepower load to be measured, k represents the heating coefficient, and L represents the reference water flow rate.

4. The method according to claim 1, characterized in that, The method further includes: Determining a maximum reference proportional valve current value corresponding to the maximum firepower load and a maximum reference temperature rise value at the reference water flow rate under the number of firepower rows to be measured; Determining a minimum reference proportional valve current value corresponding to the minimum firepower load and a minimum reference temperature rise value at the reference water flow rate under the number of firepower rows to be measured; The ratio of the difference between the maximum reference temperature rise value and the minimum reference temperature rise value to the difference between the maximum reference proportional valve current value and the minimum reference proportional valve current value is determined as the temperature difference change amount corresponding to the unit proportional valve current for the measured number of firing rows and the reference water flow rate.

5. The method according to claim 1, wherein After adjusting the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, the method further includes: If the adjusted reference proportional valve current value exceeds the normal proportional valve current value range corresponding to the measured number of firing rows and the measured heating load, stop the calibration.

6. An automatic calibration system for a proportional valve of a gas water heater, characterized in that, The system includes an inlet water temperature sensor, an outlet water temperature sensor, a water regulating valve, a water flow sensor, and an automatic calibration control device; The automatic calibration control device is configured to determine the reference proportional valve current value and the reference temperature rise value at the reference water flow rate corresponding to the measured number of firing rows and the measured heating load of the gas water heater to be measured; The automatic calibration control device is further configured to control the number of firing rows of the gas water heater to be measured to be the measured number of firing rows, the proportional valve current value to be the determined reference proportional valve current value, and control the water inflow to be the reference water flow rate through the water regulating valve and the water flow sensor, and obtain the actual temperature rise value of the gas water heater to be measured through the inlet water temperature sensor and the outlet water temperature sensor; The automatic calibration control device is further configured to, if the actual temperature rise value and the reference temperature rise value do not meet the preset proximity condition, adjust the reference proportional valve current value according to the obtained actual temperature rise value, the determined reference temperature rise value, and the preset proportional valve current adjustment strategy, and repeat the steps of controlling the number of firing rows of the gas water heater to be measured to be the measured number of firing rows, the proportional valve current value to be the determined reference proportional valve current value, and controlling the water inflow to be the reference water flow rate through the water regulating valve and the water flow sensor, and obtaining the actual temperature rise value of the gas water heater to be measured through the inlet water temperature sensor and the outlet water temperature sensor until the obtained actual temperature rise value and the reference temperature rise value meet the proximity condition; The automatic calibration control device is specifically configured to: If the actual temperature rise value is greater than the sum of the reference temperature rise value and the first preset deviation, the ratio of the difference between the actual temperature rise value and the reference temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current is determined as the proportional valve current reduction value, and the determined reference proportional valve current value is reduced by the proportional valve current reduction value; If the actual temperature rise value is less than the difference between the reference temperature rise value and the second preset deviation, the ratio of the difference between the reference temperature rise value and the actual temperature rise value to the temperature difference change amount corresponding to the unit proportional valve current is determined as the proportional valve current increase value, and the determined reference proportional valve current value is increased by the proportional valve current increase value.

7. The system according to claim 6, wherein The automatic calibration control device is specifically configured to: In the pre-stored correspondence relationship among the number of firepower rows, the firepower load, and the proportional valve current value of the gas water heater to be measured, query the reference proportional valve current value corresponding to the measured number of firepower rows and the measured firepower load. According to the measured firepower load, the reference water flow rate, and the preset heating coefficient, determine the reference temperature rise value of the measured firepower load at the reference water flow rate.

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