A control method and system for an intelligent gas proportional valve

Abstract

The application provides a control method and system of an intelligent gas proportional valve, which determines an initial gas supply flow of a water heater based on a target water temperature setting value of the water heater, controls a gas inlet valve of the gas proportional valve to be in a corresponding initial opening state, and ensures that the gas proportional valve can continuously supply gas and air for the water heater; determines whether the firepower of the water heater needs to be adjusted based on water output state information of a water outlet port corresponding to the water heater, adjusts the opening state of the gas inlet valve of the gas proportional valve based on a firepower size adjustment target value, effectively improves the utilization efficiency of the water heater on gas, and ensures accurate adjustment of the gas supply of the gas proportional valve; and analyzes waste gas state data of an exhaust pipe of the water heater, determines whether the waste gas emission of the water heater is abnormal, and adjusts the working state of the gas inlet valve and the air inlet valve of the gas proportional valve.

Description

Technical Field

[0001] This invention relates to the field of gas transmission control, and more particularly to a control method and system for intelligent gas proportional valves. Background Technology

[0002] As a core component of a water heater, the gas proportional valve regulates the ratio of gas to air entering the heater, thereby adjusting the water heater's heat output. Current water heaters are controlled by microcomputers, and the gas proportional valve typically uses a solenoid valve to independently control the input of gas and air. Once a specific water temperature is set, the microcomputer adjusts the gas proportional valve in real time based on the set temperature and the water heater's output hot water flow rate. By changing the gas and air input, the heat output is increased or decreased to ensure the output water temperature matches the set value. However, this method only controls the gas proportional valve based on water temperature and cannot effectively and comprehensively control the overall stability and safety of the water heater. Therefore, multi-faceted control of the gas proportional valve is necessary not only to ensure a stable and normal hot water supply but also to guarantee efficient gas combustion and the water heater's operational safety. Summary of the Invention

[0003] The purpose of this invention is to provide a control method and system for an intelligent gas proportional valve. Based on the target water temperature setpoint of the water heater, it determines the initial gas supply flow rate of the water heater, thereby controlling the gas inlet valve of the gas proportional valve to be in the corresponding initial opening state, ensuring that the gas proportional valve can continuously supply gas and air to the water heater. Furthermore, based on the water output status information of the corresponding outlet port of the water heater, it determines whether the water heater's heat output needs adjustment, and adjusts the opening state of the gas inlet valve of the gas proportional valve based on the target heat output value, effectively improving the water heater's gas utilization efficiency while ensuring precise adjustment of the gas supply by the gas proportional valve. Additionally, it analyzes the exhaust gas status data of the water heater's exhaust pipe to determine if the exhaust gas emission is abnormal, thereby adjusting the working state of the gas inlet valve and air inlet valve of the gas proportional valve to prevent incomplete combustion of gas inside the water heater or abnormal exhaust gas emission leading to carbon monoxide poisoning. This multi-faceted control of the gas proportional valve not only ensures a normal and stable supply of hot water to the water heater but also guarantees effective gas combustion and the safe operation of the water heater.

[0004] This invention is achieved through the following technical solution:

[0005] A control method for an intelligent gas proportional valve includes:

[0006] Based on the target water temperature setpoint of the water heater, the initial gas supply flow rate of the water heater is determined; based on the initial gas supply flow rate, a first control command is sent to the gas proportional valve, so that the gas inlet valve of the gas proportional valve is in the corresponding initial opening state.

[0007] Obtain the water output status information of the water outlet port, and based on the hot water output status information, determine whether it is necessary to adjust the firepower of the water heater; based on the target value for adjusting the firepower of the water heater, send a second control command to the gas proportional valve to adjust the opening state of the gas inlet valve of the gas proportional valve.

[0008] The system acquires exhaust gas status data from the water heater's exhaust pipe, analyzes the exhaust gas status data, and determines whether the water heater is currently in an abnormal exhaust gas emission state. If the water heater is in an abnormal exhaust gas emission state, the system adjusts the operating status of the gas intake valve and air intake valve of the gas proportional valve.

[0009] Optionally, based on the target water temperature setpoint of the water heater, the initial gas supply flow rate of the water heater is determined; based on the initial gas supply flow rate, a first control command is sent to the gas proportional valve to put the gas inlet valve of the gas proportional valve into a corresponding initial opening state, including:

[0010] Based on the cold water temperature input at the inlet of the water heater and the target water temperature setting value of the water heater, the required gas volume value for heating the unit volume of cold water input at the inlet to the target water temperature setting value is determined; then, based on the cold water input flow rate corresponding to the inlet and the gas volume value, the initial gas supply flow rate of the water heater in the working mode corresponding to the target water temperature setting value is determined.

[0011] Based on the initial gas supply flow rate and the valve opening change sensitivity of the gas intake valve of the gas proportional valve, a first control command is sent to the gas proportional valve to make the gas intake valve be in the corresponding initial opening state; wherein, the valve opening change sensitivity refers to the minimum value that the valve opening of the gas intake valve can be changed at one time.

[0012] Optionally, based on the initial gas supply flow rate and the sensitivity of the gas intake valve of the gas proportional valve to change its opening degree, a first control command is sent to the gas proportional valve to place the gas intake valve in a corresponding initial opening state, including:

[0013] Step S1: Using the following formula (1), based on the initial gas supply flow rate and the gas flow rate corresponding to the initial gas supply, obtain the theoretical opening value of the gas intake valve.

[0014]

[0015] In the above formula (1), θ represents the theoretical opening value of the gas intake valve; Q represents the initial gas supply flow rate; X represents the gas flow rate corresponding to the initial gas supply; and R represents the pipe radius value when the gas intake valve is in the fully open state.

[0016] Step S2: Using the following formula (2), based on the theoretical opening value of the gas intake valve and the sensitivity of the valve opening change, determine whether the gas intake valve needs to be floated.

[0017]

[0018] In the above formula (2), E represents the judgment value for determining whether the gas intake valve needs to float; This indicates the sensitivity of the valve opening change; Indicates to Take the remainder;

[0019] If E = 1, it means that the gas intake valve needs to be adjusted to a floating position. Therefore, the opening of the gas intake valve should first be adjusted to... Then the opening value is adjusted by a change of +1° to -1°, where This indicates that the value within the parentheses will be rounded down to the nearest integer.

[0020] If E = 0, it means that the gas intake valve does not need to be floated, and the gas intake valve is directly controlled according to the theoretical opening value of the gas intake valve.

[0021] Step S3: When the gas intake valve needs to undergo a floating change, the change rate of the floating change is determined using the following formula (3) based on the theoretical opening value of the gas intake valve and the valve opening change sensitivity.

[0022]

[0023] In the above formula (3), Δv + This indicates that the speed value is adjusted by changing the valve opening value by +1°; where Δv - This indicates that the valve opening value is adjusted by a change of -1° to change the speed value; v max The value represents the maximum rate of change of the floating change; f{} represents the non-negativity test function. If the value inside the parentheses is greater than or equal to 0, the function value of the non-negativity test function is 1. If the value inside the parentheses is less than 0, the function value of the non-negativity test function is 0.

[0024] Optionally, the water output status information of the outlet port is obtained, and based on the hot water output status information, it is determined whether the heat output of the water heater needs to be adjusted; based on the target value for adjusting the heat output of the water heater, a second control command is sent to the gas proportional valve to adjust the opening state of the gas inlet valve of the gas proportional valve, including:

[0025] The system obtains the output hot water temperature and flow rate of the hot water output pipe connected to the water heater at the outlet port, as well as the output cold water temperature and flow rate of the cold water pipe connected to the outlet port. Based on the output hot water temperature, the output hot water flow rate, the output cold water temperature, and the output cold water flow rate, it determines whether the final output mixed water after mixing hot and cold water at the outlet port has an unstable water temperature. If the water temperature is unstable, it determines that the heat output of the water heater needs to be increased.

[0026] Based on the temperature difference between the output hot water temperature and the target water temperature setpoint, and the output hot water flow rate, a target value for adjusting the heat output of the water heater is determined; then, based on the target value for adjusting the heat output, a second control command is sent to the gas proportional valve to increase the opening of the gas inlet valve of the gas proportional valve.

[0027] Optionally, the exhaust gas status data of the water heater's exhaust pipe is acquired, and the exhaust gas status data is analyzed to determine whether the water heater is currently in an abnormal exhaust gas emission state; if the water heater is in an abnormal exhaust gas emission state, the working state of the gas inlet valve and air inlet valve of the gas proportional valve is adjusted, including:

[0028] The exhaust gas velocity and carbon monoxide concentration in the exhaust gas of the water heater are obtained. If the exhaust gas velocity is less than a preset velocity threshold or the carbon monoxide concentration is greater than a preset concentration threshold, the water heater is determined to be in an abnormal exhaust gas emission state.

[0029] When the water heater is in an abnormal exhaust emission state, the opening of the gas intake valve is reduced and the opening of the air intake valve is increased so that the concentration of carbon monoxide in the exhaust gas output from the exhaust pipe is reduced to below a preset concentration threshold.

[0030] A control system for an intelligent gas proportional valve includes:

[0031] The initial gas supply flow determination module is used to determine the initial gas supply flow of the water heater based on the target water temperature setpoint of the water heater.

[0032] The gas proportional valve adjustment module is used to send a first control command to the gas proportional valve based on the initial gas supply flow rate, so that the gas inlet valve of the gas proportional valve is in the corresponding initial opening state.

[0033] The heat output status judgment module is used to obtain the water output status information of the water outlet port, and based on the hot water output status information, to determine whether the heat output of the water heater needs to be adjusted.

[0034] The gas proportional valve adjustment module is also used to adjust the target value based on the firepower of the water heater, send a second control command to the gas proportional valve, and adjust the opening state of the gas inlet valve of the gas proportional valve.

[0035] The exhaust gas emission status judgment module is used to acquire exhaust gas status data of the exhaust pipe of the water heater, analyze the exhaust gas status data, and determine whether the water heater is currently in an abnormal exhaust gas emission state.

[0036] The gas proportional valve adjustment module is also used to adjust the working state of the gas inlet valve and the air inlet valve of the gas proportional valve when the water heater is in an abnormal exhaust emission state.

[0037] Optionally, the initial gas supply flow determination module is used to determine the initial gas supply flow of the water heater based on the target water temperature setpoint of the water heater, including:

[0038] Based on the cold water temperature input at the inlet of the water heater and the target water temperature setting value of the water heater, the required gas volume value for heating the unit volume of cold water input at the inlet to the target water temperature setting value is determined; then, based on the cold water input flow rate corresponding to the inlet and the gas volume value, the initial gas supply flow rate of the water heater in the working mode corresponding to the target water temperature setting value is determined.

[0039] The gas proportional valve adjustment module is used to send a first control command to the gas proportional valve based on the initial gas supply flow rate, so that the gas intake valve of the gas proportional valve is in a corresponding initial opening state, including:

[0040] Based on the initial gas supply flow rate and the valve opening change sensitivity of the gas intake valve of the gas proportional valve, a first control command is sent to the gas proportional valve to make the gas intake valve be in the corresponding initial opening state; wherein, the valve opening change sensitivity refers to the minimum value that the valve opening of the gas intake valve can be changed at one time.

[0041] Optionally, the heat output status determination module is used to obtain water output status information from the water outlet port, and based on the hot water output status information, determine whether the heat output of the water heater needs to be adjusted, including:

[0042] The system obtains the output hot water temperature and flow rate of the hot water output pipe connected to the water heater at the outlet port, as well as the output cold water temperature and flow rate of the cold water pipe connected to the outlet port. Based on the output hot water temperature, the output hot water flow rate, the output cold water temperature, and the output cold water flow rate, it determines whether the final output mixed water after mixing hot and cold water at the outlet port has an unstable water temperature. If the water temperature is unstable, it determines that the heat output of the water heater needs to be increased.

[0043] The gas proportional valve adjustment module is also used to adjust the target value based on the firepower of the water heater, send a second control command to the gas proportional valve, and adjust the opening state of the gas inlet valve of the gas proportional valve, including:

[0044] Based on the temperature difference between the output hot water temperature and the target water temperature setpoint, and the output hot water flow rate, a target value for adjusting the heat output of the water heater is determined; then, based on the target value for adjusting the heat output, a second control command is sent to the gas proportional valve to increase the opening of the gas inlet valve of the gas proportional valve.

[0045] Optionally, the exhaust gas emission status judgment module is used to acquire exhaust gas status data of the water heater's exhaust pipe, analyze the exhaust gas status data, and determine whether the water heater is currently in an abnormal exhaust gas emission state, including:

[0046] The exhaust gas velocity and carbon monoxide concentration in the exhaust gas of the water heater are obtained. If the exhaust gas velocity is less than a preset velocity threshold or the carbon monoxide concentration is greater than a preset concentration threshold, the water heater is determined to be in an abnormal exhaust gas emission state.

[0047] The gas proportional valve adjustment module is also used to adjust the working state of the gas inlet valve and air inlet valve of the gas proportional valve when the water heater is in an abnormal exhaust emission state, including:

[0048] When the water heater is in an abnormal exhaust emission state, the opening of the gas intake valve is reduced and the opening of the air intake valve is increased so that the concentration of carbon monoxide in the exhaust gas output from the exhaust pipe is reduced to below a preset concentration threshold.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The intelligent gas proportional valve control method and system provided in this application determine the initial gas supply flow rate of the water heater based on the target water temperature setpoint, thereby controlling the gas inlet valve of the gas proportional valve to be in the corresponding initial opening state, ensuring that the gas proportional valve can continuously supply gas and air to the water heater; it also determines whether the water heater's firepower needs to be adjusted based on the water output status information of the corresponding water outlet port, and adjusts the opening state of the gas inlet valve of the gas proportional valve based on the firepower adjustment target value, effectively improving the water heater's gas utilization efficiency, while also ensuring the precise adjustment of the gas supply by the gas proportional valve; and it analyzes the exhaust gas status data of the water heater's exhaust pipe to determine whether the water heater's exhaust gas emission is abnormal, thereby adjusting the working state of the gas inlet valve and air inlet valve of the gas proportional valve, preventing carbon monoxide poisoning caused by incomplete combustion of gas inside the water heater or abnormal exhaust gas emission. This multi-faceted control of the gas proportional valve not only ensures a normal and stable supply of hot water to the water heater, but also ensures effective gas combustion and the safe operation of the water heater. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0052] Figure 1 This is a flowchart illustrating a control method for an intelligent gas proportional valve provided by the present invention.

[0053] Figure 2 This is a schematic diagram of the control system for an intelligent gas proportional valve provided by the present invention. Detailed Implementation

[0054] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0055] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0056] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0057] Please see Figure 1 As shown, an embodiment of this application provides a control method for an intelligent gas proportional valve, including:

[0058] Based on the target water temperature setpoint of the water heater, the initial gas supply flow rate of the water heater is determined; based on the initial gas supply flow rate, a first control command is sent to the gas proportional valve, so that the gas inlet valve of the gas proportional valve is in the corresponding initial opening state.

[0059] Obtain the water output status information of the water outlet port, and based on the hot water output status information, determine whether the heat output of the water heater needs to be adjusted; based on the target value for adjusting the heat output of the water heater, send a second control command to the gas proportional valve to adjust the opening state of the gas inlet valve of the gas proportional valve.

[0060] Obtain the exhaust gas status data of the water heater's exhaust pipe, analyze the exhaust gas status data, and determine whether the water heater is currently in an abnormal exhaust gas emission state; if the water heater is in an abnormal exhaust gas emission state, adjust the working status of the gas proportional valve's gas intake valve and air intake valve.

[0061] The beneficial effects of the above embodiments are as follows: the control method of the intelligent gas proportional valve determines the initial gas supply flow of the water heater based on the target water temperature setpoint, thereby controlling the gas inlet valve of the gas proportional valve to be in the corresponding initial opening state, ensuring that the gas proportional valve can continuously supply gas and air to the water heater; it also determines whether the water heater's firepower needs to be adjusted based on the water output status information of the corresponding water outlet port, and adjusts the opening state of the gas inlet valve of the gas proportional valve based on the firepower adjustment target value, effectively improving the water heater's gas utilization efficiency, while also ensuring the precise adjustment of the gas supply by the gas proportional valve; and it analyzes the exhaust gas status data of the water heater's exhaust pipe to determine whether the water heater's exhaust gas emission is abnormal, thereby adjusting the working state of the gas inlet valve and air inlet valve of the gas proportional valve, preventing carbon monoxide poisoning caused by incomplete combustion of gas inside the water heater or failure to properly discharge exhaust gas. This multi-faceted control of the gas proportional valve not only ensures the normal and stable supply of hot water to the water heater, but also ensures effective combustion of gas and the safe operation of the water heater.

[0062] In another embodiment, the initial gas supply flow rate of the water heater is determined based on the target water temperature setpoint; based on this initial gas supply flow rate, a first control command is sent to the gas proportional valve to put the gas inlet valve of the gas proportional valve into a corresponding initial opening state, including:

[0063] Based on the cold water temperature input at the inlet of the water heater and the target water temperature setting of the water heater, the required gas volume value for heating the unit volume of cold water input at the inlet to the target water temperature setting is determined; then, based on the cold water input flow rate corresponding to the inlet and the gas volume value, the initial gas supply flow rate of the water heater in the working mode corresponding to the target water temperature setting is determined.

[0064] Based on the initial gas supply flow rate and the valve opening change sensitivity of the gas intake valve of the gas proportional valve, a first control command is sent to the gas proportional valve to put the gas intake valve into the corresponding initial opening state; wherein, the valve opening change sensitivity refers to the minimum value that the valve opening of the gas intake valve can be changed at one time.

[0065] The beneficial effects of the above embodiments are that the water heater uses the gas and air mixed together from the gas proportional valve for combustion, thereby heating the cold water input from its inlet. The user can operate the water heater through the control panel or remote control to preset the hot water temperature value to be generated by the water heater, so that the water heater can heat the input cold water with the corresponding heat. The lower the temperature of the input cold water or the greater the flow rate of the cold water to be heated (i.e., the larger the volume of cold water to be heated per unit time), the greater the heat output of the water heater. To ensure that the water heater can accurately heat the cold water under different cold water temperatures and flow rates, and to ensure that the heated water has the same temperature, the required heat to heat a unit volume of cold water input to the target water temperature is determined based on the cold water temperature input at the water heater's inlet and the target water temperature setting. Furthermore, the required gas volume is determined based on the required heat and the heat provided to the cold water by a unit volume of gas combustion. Finally, the initial gas supply flow rate (i.e., the gas supply volume per unit time) of the water heater in the operating mode corresponding to the target water temperature setting is determined by combining the corresponding cold water input flow rate (i.e., the gas supply volume per unit time). The gas proportional valve includes a gas inlet valve and an air inlet valve, which respectively supply gas and air. The gas inlet valve and air inlet valve can independently adjust their valve openings, thereby adjusting the gas and air supply rates. The gas inlet valve and air inlet valve can be, but are not limited to, solenoid valves. Based on the initial gas supply flow rate and the sensitivity of the gas inlet valve's opening change, a first control command is sent to the gas proportional valve, causing the gas inlet valve to switch to the corresponding initial opening state (i.e., the appropriate opening size). This ensures a stable gas supply to the water heater. In actual adjustment, when the gas proportional valve receives the first control command, it determines the magnitude of the increase or decrease in the gas inlet valve's opening based on the command. The gas inlet valve then adjusts its opening according to its sensitivity, maximizing the ideal opening state.

[0066] In another embodiment, based on the initial gas supply flow rate and the sensitivity of the gas intake valve of the gas proportional valve to changes in valve opening, a first control command is sent to the gas proportional valve to place the gas intake valve in a corresponding initial opening state, including:

[0067] Step S1: Using the formula (1) below, based on the initial gas supply flow rate and the corresponding gas flow velocity, obtain the theoretical opening value of the gas intake valve.

[0068]

[0069] In the above formula (1), θ represents the theoretical opening value of the gas intake valve; Q represents the initial gas supply flow rate; X represents the gas flow rate corresponding to the initial gas supply; and R represents the pipe radius value when the gas intake valve is in the fully open state.

[0070] Step S2: Using the formula (2) below, based on the theoretical opening value of the gas intake valve and the sensitivity of the valve opening change, determine whether the gas intake valve needs to be floated.

[0071]

[0072] In the above formula (2), E represents the judgment value for determining whether the gas intake valve needs to float; This indicates the sensitivity of the valve opening change; Indicates to Take the remainder;

[0073] If E = 1, it means that the gas intake valve needs to be adjusted to a floating position. Therefore, first adjust the opening of the gas intake valve to... Then, the opening value is adjusted by varying it by +1° to -1°. This indicates that the value within the parentheses will be rounded down to the nearest integer.

[0074] If E = 0, it means that the gas intake valve does not need to be floated, and the gas intake valve is directly controlled according to the theoretical opening value of the gas intake valve.

[0075] Step S3: When the gas intake valve needs to undergo a floating change, the change rate of the floating change is determined using the following formula (3) based on the theoretical opening value of the gas intake valve and the valve opening change sensitivity.

[0076]

[0077] In the above formula (3), Δv + This indicates that the valve opening value is adjusted by +1° to change the speed value; where Δv - This indicates that the valve opening value is adjusted by -1° to change the speed value; v max This represents the maximum rate of change of the floating change; F{} represents the non-negativity test function. If the value inside the parentheses is greater than or equal to 0, the function value of the non-negativity test function is 1; if the value inside the parentheses is less than 0, the function value of the non-negativity test function is 0.

[0078] The beneficial effects of the above embodiments are as follows: using the above formula (1), the theoretical opening value of the gas intake valve is obtained based on the initial gas supply flow rate and the gas flow rate corresponding to the initial gas supply, thereby obtaining a precise adjustment value for subsequent control to ensure the accuracy of the system; then using the above formula (2), based on the theoretical opening value of the gas intake valve and the valve opening change sensitivity, it is determined whether the gas intake valve needs to float, so that when the minimum value of the valve opening of the gas intake valve can not accurately meet the control, a floating change is performed to reduce the control error and improve the control accuracy of the system; finally using the above formula (3), based on the theoretical opening value of the gas intake valve and the valve opening change sensitivity, the change speed value of the floating change is determined, thereby adjusting the speed according to the precise position within the floating 1°, so that the floating control error of the system is smaller.

[0079] In another embodiment, water output status information at the outlet port is obtained; based on the hot water output status information, it is determined whether the heat output of the water heater needs to be adjusted; based on the target value for adjusting the heat output of the water heater, a second control command is sent to the gas proportional valve to adjust the opening state of the gas inlet valve of the gas proportional valve, including:

[0080] The system obtains the output hot water temperature and flow rate of the hot water output pipe connected to the water heater at the outlet port, as well as the output cold water temperature and flow rate of the cold water pipe connected to the outlet port. Based on the output hot water temperature, output hot water flow rate, output cold water temperature, and output cold water flow rate, it determines whether the final output mixed water after mixing hot and cold water at the outlet port has an unstable water temperature. If the water temperature is unstable, it determines that the heat output of the water heater needs to be increased.

[0081] Based on the temperature difference between the output hot water temperature and the target water temperature setting, as well as the output hot water flow rate, the target value for adjusting the firepower of the water heater is determined; then, based on the target value for adjusting the firepower, a second control command is sent to the gas proportional valve to increase the opening of the gas inlet valve of the gas proportional valve.

[0082] The beneficial effects of the above embodiments are that the hot water generated by the water heater usually needs to be mixed with cold water before use. For example, the hot water generated by a household water heater is usually connected to a corresponding faucet pipe, which is also connected to a cold water pipe. In this way, the hot water generated by the water heater will mix with the cold water provided by the cold water pipe, and the volume of the mixed hot and cold water can be adjusted manually. In actual operation, the output hot water temperature and flow rate of the hot water output pipe of the water heater connected to the outlet port (such as the shower head or faucet connected to the water heater), and the output cold water temperature and flow rate of the cold water pipe connected to the outlet port are obtained. This is used to determine whether the final output mixed water after the hot and cold water are mixed at the outlet port has an unstable water temperature. If the rate of change of the mixed water temperature is greater than or equal to a preset rate of change threshold within a preset time period, it is determined that the mixed water has an unstable water temperature. At this time, it is determined that the heat output of the water heater needs to be increased so that the water heater can stably heat the cold water, thereby ensuring that the water heater provides a stable supply of hot water. Furthermore, based on the temperature difference between the output hot water temperature and the target water temperature setpoint, as well as the output hot water flow rate, the target value for adjusting the firepower of the water heater is determined, and a second control command is sent to the gas proportional valve to increase the opening of the gas inlet valve of the gas proportional valve, so that the gas proportional valve can increase the gas supply and ensure the heating efficiency of the water heater.

[0083] In another embodiment, exhaust gas status data of the water heater's exhaust pipe is acquired, and the exhaust gas status data is analyzed to determine whether the water heater is currently in an abnormal exhaust gas emission state; if the water heater is in an abnormal exhaust gas emission state, the operating states of the gas proportional valve's gas inlet valve and air inlet valve are adjusted, including:

[0084] The exhaust gas velocity and carbon monoxide concentration in the exhaust gas of the water heater are obtained. If the exhaust gas velocity is less than a preset velocity threshold or the carbon monoxide concentration is greater than a preset concentration threshold, the water heater is determined to be in an abnormal exhaust gas emission state.

[0085] When the water heater is in an abnormal exhaust emission state, the opening of the gas intake valve is reduced and the opening of the air intake valve is increased so that the concentration of carbon monoxide in the exhaust gas output from the exhaust pipe is reduced to below the preset concentration threshold.

[0086] The beneficial effects of the above embodiments are as follows: During the operation of the water heater, incomplete combustion of gas can produce carbon monoxide. If the carbon monoxide cannot be discharged through the exhaust pipe in a timely manner or if the concentration of carbon monoxide is high, it will pose a safety hazard. By acquiring and analyzing the exhaust gas velocity and carbon monoxide concentration in the exhaust gas from the water heater's exhaust pipe, it can be determined whether the water heater is currently in an abnormal exhaust gas emission state. When the water heater is in an abnormal exhaust gas emission state, the opening of the gas inlet valve is reduced and the opening of the air inlet valve is increased to improve the combustion efficiency of the gas, thereby reducing the concentration of carbon monoxide in the exhaust gas from the exhaust pipe to below a preset concentration threshold, thus preventing safety accidents from occurring during the operation of the water heater.

[0087] Please see Figure 2 As shown, the control system of the intelligent gas proportional valve provided in one embodiment of this application includes:

[0088] The initial gas supply flow determination module is used to determine the initial gas supply flow of the water heater based on the target water temperature setpoint of the water heater.

[0089] The gas proportional valve adjustment module is used to send a first control command to the gas proportional valve based on the initial gas supply flow, so that the gas inlet valve of the gas proportional valve is in the corresponding initial opening state.

[0090] The heat output status judgment module is used to obtain the water output status information of the water outlet port, and based on the hot water output status information, to determine whether the heat output of the water heater needs to be adjusted.

[0091] The gas proportional valve adjustment module is also used to adjust the target value based on the firepower of the water heater, send a second control command to the gas proportional valve, and adjust the opening state of the gas inlet valve of the gas proportional valve.

[0092] The exhaust gas emission status judgment module is used to acquire the exhaust gas status data of the water heater's exhaust pipe, analyze the exhaust gas status data, and determine whether the water heater is currently in an abnormal exhaust gas emission state.

[0093] The gas proportional valve adjustment module is also used to adjust the working status of the gas inlet valve and the air inlet valve of the gas proportional valve when the water heater is in an abnormal exhaust emission state.

[0094] The beneficial effects of the above embodiments are as follows: The control system of the intelligent gas proportional valve determines the initial gas supply flow of the water heater based on the target water temperature setpoint, thereby controlling the gas inlet valve of the gas proportional valve to be in the corresponding initial opening state, ensuring that the gas proportional valve can continuously supply gas and air to the water heater; it also determines whether the water heater's firepower needs to be adjusted based on the water output status information of the corresponding water outlet port, and adjusts the opening state of the gas inlet valve of the gas proportional valve based on the firepower adjustment target value, effectively improving the water heater's gas utilization efficiency, while also ensuring the precise adjustment of the gas supply by the gas proportional valve; and it analyzes the exhaust gas status data of the water heater's exhaust pipe to determine whether the water heater's exhaust gas emission is abnormal, thereby adjusting the working state of the gas inlet valve and air inlet valve of the gas proportional valve, preventing carbon monoxide poisoning caused by incomplete combustion of gas inside the water heater or failure to properly discharge exhaust gas. This multi-faceted control of the gas proportional valve not only ensures the normal and stable supply of hot water to the water heater, but also ensures effective combustion of gas and the safe operation of the water heater.

[0095] In another embodiment, the initial gas supply flow determination module is used to determine the initial gas supply flow of the water heater based on the target water temperature setpoint of the water heater, including:

[0096] Based on the cold water temperature input at the inlet of the water heater and the target water temperature setting of the water heater, the required gas volume value for heating the unit volume of cold water input at the inlet to the target water temperature setting is determined; then, based on the cold water input flow rate corresponding to the inlet and the gas volume value, the initial gas supply flow rate of the water heater in the working mode corresponding to the target water temperature setting is determined.

[0097] The gas proportional valve adjustment module is used to send a first control command to the gas proportional valve based on the initial gas supply flow rate, so that the gas intake valve of the gas proportional valve is in a corresponding initial opening state, including:

[0098] Based on the initial gas supply flow rate and the valve opening change sensitivity of the gas intake valve of the gas proportional valve, a first control command is sent to the gas proportional valve to put the gas intake valve into the corresponding initial opening state; wherein, the valve opening change sensitivity refers to the minimum value that the valve opening of the gas intake valve can be changed at one time.

[0099] The beneficial effects of the above embodiments are that the water heater uses the gas and air mixed together from the gas proportional valve for combustion, thereby heating the cold water input from its inlet. The user can operate the water heater through the control panel or remote control to preset the hot water temperature value to be generated by the water heater, so that the water heater can heat the input cold water with the corresponding heat. The lower the temperature of the input cold water or the greater the flow rate of the cold water to be heated (i.e., the larger the volume of cold water to be heated per unit time), the greater the heat output of the water heater. To ensure that the water heater can accurately heat the cold water under different cold water temperatures and flow rates, and to ensure that the heated water has the same temperature, the required heat to heat a unit volume of cold water input to the target water temperature is determined based on the cold water temperature input at the water heater's inlet and the target water temperature setting. Furthermore, the required gas volume is determined based on the required heat and the heat provided to the cold water by a unit volume of gas combustion. Finally, the initial gas supply flow rate (i.e., the gas supply volume per unit time) of the water heater in the operating mode corresponding to the target water temperature setting is determined by combining the corresponding cold water input flow rate (i.e., the gas supply volume per unit time). The gas proportional valve includes a gas inlet valve and an air inlet valve, which respectively supply gas and air. The gas inlet valve and air inlet valve can independently adjust their valve openings, thereby adjusting the gas and air supply rates. The gas inlet valve and air inlet valve can be, but are not limited to, solenoid valves. Based on the initial gas supply flow rate and the sensitivity of the gas inlet valve's opening change, a first control command is sent to the gas proportional valve, causing the gas inlet valve to switch to the corresponding initial opening state (i.e., the appropriate opening size). This ensures a stable gas supply to the water heater. In actual adjustment, when the gas proportional valve receives the first control command, it determines the magnitude of the increase or decrease in the gas inlet valve's opening based on the command. The gas inlet valve then adjusts its opening according to its sensitivity, maximizing the ideal opening state.

[0100] In another embodiment, the heat output status determination module is used to obtain water output status information from the water outlet port, and based on the hot water output status information, determine whether the heat output of the water heater needs to be adjusted, including:

[0101] The system obtains the output hot water temperature and flow rate of the hot water output pipe connected to the water heater at the outlet port, as well as the output cold water temperature and flow rate of the cold water pipe connected to the outlet port. Based on the output hot water temperature, output hot water flow rate, output cold water temperature, and output cold water flow rate, it determines whether the final output mixed water after mixing hot and cold water at the outlet port has an unstable water temperature. If the water temperature is unstable, it determines that the heat output of the water heater needs to be increased.

[0102] The gas proportional valve adjustment module is also used to adjust the target value based on the firepower of the water heater, sending a second control command to the gas proportional valve to adjust the opening state of the gas inlet valve, including:

[0103] Based on the temperature difference between the output hot water temperature and the target water temperature setting, as well as the output hot water flow rate, the target value for adjusting the firepower of the water heater is determined; then, based on the target value for adjusting the firepower, a second control command is sent to the gas proportional valve to increase the opening of the gas inlet valve of the gas proportional valve.

[0104] The beneficial effects of the above embodiments are that the hot water generated by the water heater usually needs to be mixed with cold water before use. For example, the hot water generated by a household water heater is usually connected to a corresponding faucet pipe, which is also connected to a cold water pipe. In this way, the hot water generated by the water heater will mix with the cold water provided by the cold water pipe, and the volume of the mixed hot and cold water can be adjusted manually. In actual operation, the output hot water temperature and flow rate of the hot water output pipe of the water heater connected to the outlet port (such as the shower head or faucet connected to the water heater), and the output cold water temperature and flow rate of the cold water pipe connected to the outlet port are obtained. This is used to determine whether the final output mixed water after the hot and cold water are mixed at the outlet port has an unstable water temperature. If the rate of change of the mixed water temperature is greater than or equal to a preset rate of change threshold within a preset time period, it is determined that the mixed water has an unstable water temperature. At this time, it is determined that the heat output of the water heater needs to be increased so that the water heater can stably heat the cold water, thereby ensuring that the water heater provides a stable supply of hot water. Furthermore, based on the temperature difference between the output hot water temperature and the target water temperature setpoint, as well as the output hot water flow rate, the target value for adjusting the firepower of the water heater is determined, and a second control command is sent to the gas proportional valve to increase the opening of the gas inlet valve of the gas proportional valve, so that the gas proportional valve can increase the gas supply and ensure the heating efficiency of the water heater.

[0105] In another embodiment, the exhaust gas emission status determination module is used to acquire exhaust gas status data of the water heater's exhaust pipe, analyze the exhaust gas status data, and determine whether the water heater is currently in an abnormal exhaust gas emission state, including:

[0106] The exhaust gas velocity and carbon monoxide concentration in the exhaust gas of the water heater are obtained. If the exhaust gas velocity is less than a preset velocity threshold or the carbon monoxide concentration is greater than a preset concentration threshold, the water heater is determined to be in an abnormal exhaust gas emission state.

[0107] The gas proportional valve adjustment module is also used to adjust the working status of the gas inlet valve and air inlet valve of the gas proportional valve when the water heater is in an abnormal exhaust emission state, including:

[0108] When the water heater is in an abnormal exhaust emission state, the opening of the gas inlet valve is reduced and the opening of the air inlet valve is increased so that the concentration of carbon monoxide in the exhaust gas output from the exhaust pipe is reduced to below the preset concentration threshold.

[0109] The beneficial effects of the above embodiments are as follows: During the operation of the water heater, incomplete combustion of gas can produce carbon monoxide. If the carbon monoxide cannot be discharged through the exhaust pipe in a timely manner or if the concentration of carbon monoxide is high, it will pose a safety hazard. By acquiring and analyzing the exhaust gas velocity and carbon monoxide concentration in the exhaust gas from the water heater's exhaust pipe, it can be determined whether the water heater is currently in an abnormal exhaust gas emission state. When the water heater is in an abnormal exhaust gas emission state, the opening of the gas inlet valve is reduced and the opening of the air inlet valve is increased to improve the combustion efficiency of the gas, thereby reducing the concentration of carbon monoxide in the exhaust gas from the exhaust pipe to below a preset concentration threshold, thus preventing safety accidents from occurring during the operation of the water heater.

[0110] In summary, this intelligent gas proportional valve control method and system determines the initial gas supply flow rate of the water heater based on the target water temperature setpoint. This controls the gas inlet valve of the proportional valve to maintain its initial opening, ensuring a continuous gas and air supply to the water heater. Furthermore, based on the water output status information of the corresponding outlet port, it determines whether the water heater's heat output needs adjustment. Using the heat output adjustment target value as a benchmark, it adjusts the opening of the gas inlet valve of the proportional valve, effectively improving the water heater's gas utilization efficiency while ensuring precise gas supply adjustment. Additionally, it analyzes the exhaust gas status data from the water heater's exhaust pipe to determine if there are any abnormalities in the exhaust emissions. This allows for adjustments to the working states of the gas inlet and air inlet valves of the proportional valve, preventing incomplete combustion of gas or improper exhaust gas discharge that could lead to carbon monoxide poisoning. This multi-faceted control of the gas proportional valve not only ensures a stable and normal hot water supply but also guarantees effective gas combustion and the water heater's operational safety.

[0111] The above is only one specific embodiment of the present invention, and any improvements made based on the concept of the present invention shall be considered within the scope of protection of the present invention.

Claims

1. A control method for an intelligent gas proportional valve, characterized in that, include: The initial gas supply flow rate of the water heater is determined based on the target water temperature setpoint. Based on the initial gas supply flow rate, a first control command is sent to the gas proportional valve to put the gas intake valve of the gas proportional valve into the corresponding initial opening state. Obtain the water output status information of the water outlet port, and based on the hot water output status information, determine whether it is necessary to adjust the firepower of the water heater; based on the target value for adjusting the firepower of the water heater, send a second control command to the gas proportional valve to adjust the opening state of the gas inlet valve of the gas proportional valve. The system acquires exhaust gas status data from the exhaust pipe of the water heater, analyzes the exhaust gas status data, and determines whether the water heater is currently in an abnormal exhaust gas emission state. If the water heater is in an abnormal exhaust gas emission state, the system adjusts the working state of the gas intake valve and air intake valve of the gas proportional valve. Specifically, based on the target water temperature setpoint of the water heater, the initial gas supply flow rate of the water heater is determined; based on the initial gas supply flow rate, a first control command is sent to the gas proportional valve to put the gas inlet valve of the gas proportional valve into a corresponding initial opening state, including: Based on the cold water temperature input at the inlet of the water heater and the target water temperature setting value of the water heater, the required gas volume value for heating the unit volume of cold water input at the inlet to the target water temperature setting value is determined; then, based on the cold water input flow rate corresponding to the inlet and the gas volume value, the initial gas supply flow rate of the water heater in the working mode corresponding to the target water temperature setting value is determined. Based on the initial gas supply flow rate and the sensitivity of the gas intake valve of the gas proportional valve to changes in valve opening, a first control command is sent to the gas proportional valve to place the gas intake valve in a corresponding initial opening state, including: Step S1: Using the following formula (1), based on the initial gas supply flow rate and the gas flow rate corresponding to the initial gas supply, obtain the theoretical opening value of the gas intake valve. （1） In the above formula (1), This represents the theoretical opening value of the gas intake valve; This represents the initial gas supply flow rate; This indicates the gas flow rate corresponding to the initial gas supply; This represents the pipe radius value when the gas intake valve is fully open; Step S2: Using the formula (2) below, determine whether the gas intake valve needs to be floated based on the theoretical opening value of the gas intake valve and the sensitivity of the valve opening change. （2） Wherein, the valve opening change sensitivity refers to the minimum allowable change in the valve opening of the gas intake valve in a single operation; in the above formula (2), This indicates the judgment value used to determine whether the gas intake valve needs to be adjusted. This indicates the sensitivity of the valve opening change; Indicates to Take the remainder; like If the value is 1, it indicates that the gas intake valve needs to be adjusted to a floating position. Therefore, the opening of the gas intake valve should first be adjusted to... Then the opening value is adjusted by a change of +1° to -1°, where This indicates that the value within the parentheses will be rounded down to the nearest integer. like =0, which means that the gas intake valve does not need to be floated, and the gas intake valve is directly controlled according to the theoretical opening value of the gas intake valve. Step S3: When the gas intake valve needs to undergo a floating change, the change rate of the floating change is determined using the following formula (3) based on the theoretical opening value of the gas intake valve and the valve opening change sensitivity. （3） In the above formula (3), This indicates that the valve opening value is adjusted by +1° to change the speed value; where... This indicates that the valve opening value is adjusted by a change of -1° to change the speed value; This represents the maximum rate of change of the floating change; Let represent the nonnegativity test function, if If the value within the parentheses is greater than or equal to 0, then the value of the nonnegativity test function is 1. If the value inside the parentheses is less than 0, then the function value of the nonnegativity test function is 0.

2. The control method for the intelligent gas proportional valve as described in claim 1, characterized in that: Obtain the water output status information from the water outlet port; based on the hot water output status information, determine whether the heat output of the water heater needs to be adjusted; based on the target value for adjusting the heat output of the water heater, send a second control command to the gas proportional valve to adjust the opening state of the gas inlet valve of the gas proportional valve, including: The system obtains the output hot water temperature and flow rate of the hot water output pipe connected to the water heater at the outlet port, as well as the output cold water temperature and flow rate of the cold water pipe connected to the outlet port. Based on the output hot water temperature, the output hot water flow rate, the output cold water temperature, and the output cold water flow rate, it determines whether the final output mixed water after mixing hot and cold water at the outlet port has an unstable water temperature. If the water temperature is unstable, it determines that the heat output of the water heater needs to be increased. Based on the temperature difference between the output hot water temperature and the target water temperature setpoint, and the output hot water flow rate, a target value for adjusting the heat output of the water heater is determined; then, based on the target value for adjusting the heat output, a second control command is sent to the gas proportional valve to increase the opening of the gas inlet valve of the gas proportional valve.

3. The control method for the intelligent gas proportional valve as described in claim 1, characterized in that: Acquire exhaust gas status data from the water heater's exhaust pipe, analyze the exhaust gas status data, and determine whether the water heater is currently in an abnormal exhaust gas emission state; if the water heater is in an abnormal exhaust gas emission state, adjust the operating state of the gas proportional valve's gas intake valve and air intake valve, including: The exhaust gas velocity and carbon monoxide concentration in the exhaust gas of the water heater are obtained. If the exhaust gas velocity is less than a preset velocity threshold or the carbon monoxide concentration is greater than a preset concentration threshold, the water heater is determined to be in an abnormal exhaust gas emission state. When the water heater is in an abnormal exhaust emission state, the opening of the gas intake valve is reduced and the opening of the air intake valve is increased so that the concentration of carbon monoxide in the exhaust gas output from the exhaust pipe is reduced to below a preset concentration threshold.

4. A control system for an intelligent gas proportional valve, characterized in that, include: The initial gas supply flow determination module is used to determine the initial gas supply flow of the water heater based on the target water temperature setpoint of the water heater. The gas proportional valve adjustment module is used to send a first control command to the gas proportional valve based on the initial gas supply flow rate, so that the gas inlet valve of the gas proportional valve is in the corresponding initial opening state. The heat output status judgment module is used to obtain the water output status information of the water outlet port, and based on the hot water output status information, to determine whether the heat output of the water heater needs to be adjusted. The gas proportional valve adjustment module is also used to adjust the target value based on the firepower of the water heater, send a second control command to the gas proportional valve, and adjust the opening state of the gas inlet valve of the gas proportional valve. The exhaust gas emission status judgment module is used to acquire exhaust gas status data of the exhaust pipe of the water heater, analyze the exhaust gas status data, and determine whether the water heater is currently in an abnormal exhaust gas emission state. The gas proportional valve adjustment module is also used to adjust the working state of the gas inlet valve and the air inlet valve of the gas proportional valve when the water heater is in an abnormal exhaust emission state. The initial gas supply flow determination module is used to determine the initial gas supply flow of the water heater based on the target water temperature setpoint, including: Based on the cold water temperature input at the inlet of the water heater and the target water temperature setting value of the water heater, the required gas volume value for heating the unit volume of cold water input at the inlet to the target water temperature setting value is determined; then, based on the cold water input flow rate corresponding to the inlet and the gas volume value, the initial gas supply flow rate of the water heater in the working mode corresponding to the target water temperature setting value is determined. The gas proportional valve adjustment module is used to send a first control command to the gas proportional valve based on the initial gas supply flow rate, so that the gas intake valve of the gas proportional valve is in a corresponding initial opening state, including: Based on the initial gas supply flow rate and the valve opening change sensitivity of the gas intake valve of the gas proportional valve, a first control command is sent to the gas proportional valve to make the gas intake valve be in the corresponding initial opening state; wherein, the valve opening change sensitivity refers to the minimum value that the valve opening of the gas intake valve can be changed at one time. Based on the initial gas supply flow rate and the sensitivity of the gas intake valve of the gas proportional valve to changes in valve opening, a first control command is sent to the gas proportional valve to place the gas intake valve in a corresponding initial opening state, including: Step S1: Using the following formula (1), based on the initial gas supply flow rate and the gas flow rate corresponding to the initial gas supply, obtain the theoretical opening value of the gas intake valve. （1） In the above formula (1), This represents the theoretical opening value of the gas intake valve; This represents the initial gas supply flow rate; This indicates the gas flow rate corresponding to the initial gas supply; This represents the pipe radius value when the gas intake valve is fully open; Step S2: Using the formula (2) below, determine whether the gas intake valve needs to be floated based on the theoretical opening value of the gas intake valve and the sensitivity of the valve opening change. （2） Wherein, the valve opening change sensitivity refers to the minimum allowable change in the valve opening of the gas intake valve in a single operation; in the above formula (2), This indicates the judgment value used to determine whether the gas intake valve needs to be adjusted. This indicates the sensitivity of the valve opening change; Indicates to Take the remainder; like If the value is 1, it indicates that the gas intake valve needs to be adjusted to a floating position. Therefore, the opening of the gas intake valve should first be adjusted to... Then the opening value is adjusted by a change of +1° to -1°, where This indicates that the value within the parentheses will be rounded down to the nearest integer. like =0, which means that the gas intake valve does not need to be floated, and the gas intake valve is directly controlled according to the theoretical opening value of the gas intake valve. Step S3: When the gas intake valve needs to undergo a floating change, the change rate of the floating change is determined using the following formula (3) based on the theoretical opening value of the gas intake valve and the valve opening change sensitivity. （3） In the above formula (3), This indicates that the valve opening value is adjusted by +1° to change the speed value; where... This indicates that the valve opening value is adjusted by a change of -1° to change the speed value; This represents the maximum rate of change of the floating change; Let represent the nonnegativity test function, if If the value within the parentheses is greater than or equal to 0, then the value of the nonnegativity test function is 1. If the value inside the parentheses is less than 0, then the function value of the nonnegativity test function is 0.

5. The control system for the intelligent gas proportional valve as described in claim 4, characterized in that: The heat output status determination module is used to obtain water output status information from the water outlet port, and based on the hot water output status information, to determine whether the heat output of the water heater needs to be adjusted, including: The system obtains the output hot water temperature and flow rate of the hot water output pipe connected to the water heater at the outlet port, as well as the output cold water temperature and flow rate of the cold water pipe connected to the outlet port. Based on the output hot water temperature, the output hot water flow rate, the output cold water temperature, and the output cold water flow rate, it determines whether the final output mixed water after mixing hot and cold water at the outlet port has an unstable water temperature. If the water temperature is unstable, it determines that the heat output of the water heater needs to be increased. The gas proportional valve adjustment module is also used to adjust the target value based on the firepower of the water heater, send a second control command to the gas proportional valve, and adjust the opening state of the gas inlet valve of the gas proportional valve, including: Based on the temperature difference between the output hot water temperature and the target water temperature setpoint, and the output hot water flow rate, a target value for adjusting the heat output of the water heater is determined; then, based on the target value for adjusting the heat output, a second control command is sent to the gas proportional valve to increase the opening of the gas inlet valve of the gas proportional valve.

6. The control system for the intelligent gas proportional valve as described in claim 4, characterized in that: The exhaust gas emission status judgment module is used to acquire exhaust gas status data from the exhaust pipe of the water heater, analyze the exhaust gas status data, and determine whether the water heater is currently in an abnormal exhaust gas emission state, including: The exhaust gas velocity and carbon monoxide concentration in the exhaust gas of the water heater are obtained. If the exhaust gas velocity is less than a preset velocity threshold or the carbon monoxide concentration is greater than a preset concentration threshold, the water heater is determined to be in an abnormal exhaust gas emission state. The gas proportional valve adjustment module is also used to adjust the working state of the gas inlet valve and air inlet valve of the gas proportional valve when the water heater is in an abnormal exhaust emission state, including: When the water heater is in an abnormal exhaust emission state, the opening of the gas intake valve is reduced and the opening of the air intake valve is increased so that the concentration of carbon monoxide in the exhaust gas output from the exhaust pipe is reduced to below a preset concentration threshold.

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