Gas appliance and control method thereof

Abstract

This application discloses a gas appliance and a control method thereof, relating to the technical field of gas appliances. The gas appliance includes a burner, and a gas pipeline and an air pipeline respectively connected to the burner; the gas pipeline is respectively provided with a gas flow sensor and a gas proportional valve; the air pipeline is respectively provided with an air flow sensor and a speed-regulating fan; wherein the gas flow sensor, the gas proportional valve, the air flow sensor, and the speed-regulating fan are respectively electrically connected to a controller, and the controller is configured to control the opening of the gas proportional valve and the speed of the speed-regulating fan based on the flow rates detected by the gas flow sensor and the air flow sensor. The gas appliance can monitor the air and gas flow rates in real time and better control the combustion power and air-fuel ratio based on these flow rates.

Description

Technical Field

[0001] The present application relates to the technical field of gas appliances, and in particular to a gas appliance and a control method thereof. Background Art

[0002] Generally speaking, gas appliances refer to all appliances that use gas (artificial gas, liquefied petroleum gas, natural gas) as fuel, such as gas stoves (gas furnaces), gas water heaters, wall-mounted boilers, etc. used in our daily life and industry.

[0003] In order to adjust the combustion power and ensure that the air-to-gas ratio reaches the ideal design value at various combustion powers, existing gas appliances are usually controlled in the following ways: the air flow is controlled by the fan speed and air pressure switch; while the gas flow is open-loop controlled, with only a certain amount of compensation being provided by the mechanical constant pressure or constant flow device in the proportional valve.

[0004] The air mass flow rate of this setup can vary significantly due to flue resistance or temperature fluctuations. Furthermore, the air pressure switch is expensive and typically requires a Venturi tube installed in the flue pipe for pressure sampling, which is prone to clogging by condensate. Controlling gas flow often struggles with pressure fluctuations, and the proportional valve mechanism suffers from low precision, high cost, and limited adjustment flexibility. Consequently, combustion power and air-fuel ratio cannot be effectively controlled, leading to excessive emissions. Summary of the Invention

[0005] The purpose of this application is to provide a gas appliance and a control method thereof, which can monitor the air and gas flow in real time and better control the combustion power and air-fuel ratio according to the above flow.

[0006] The embodiment of the present application is implemented as follows:

[0007] In one aspect of an embodiment of the present application, a gas appliance is provided, comprising a burner, and a gas pipe and an air pipe respectively connected to the burner; a gas flow sensor and a gas proportional valve are respectively provided on the gas pipe; an air flow sensor and a speed-regulating fan are respectively provided on the air pipe; wherein the gas flow sensor, the gas proportional valve, the air flow sensor and the speed-regulating fan are respectively electrically connected to a controller, and the controller is used to control the opening of the gas proportional valve and the speed of the speed-regulating fan according to the flow rates detected by the gas flow sensor and the air flow sensor.

[0008] Optionally, the gas flow sensor includes a first temperature measuring resistor and a first heating resistor respectively connected to the controller, the first temperature measuring resistor is used to measure the temperature of the gas, and the controller is used to control the first heating resistor to generate heat according to the temperature measured by the first temperature measuring resistor, and make the temperature of the first heating resistor greater than the temperature measured by the first temperature measuring resistor, so as to obtain the gas flow through the controller.

[0009] Optionally, the air flow sensor includes a second temperature measuring resistor and a second heating resistor respectively connected to the controller, the second temperature measuring resistor is used to measure the temperature of the air, and the controller is used to control the second heating resistor to generate heat according to the temperature measured by the second temperature measuring resistor, and make the temperature of the second heating resistor greater than the temperature measured by the second temperature measuring resistor, so as to obtain the air flow through the controller.

[0010] Optionally, the gas flow rate and the air flow rate are obtained by the following formula:

[0011]

[0012]

[0013] Among them, Q g is the mass flow rate of gas, H1 is the heat dissipation of the first heating resistor, λ1 is the thermal conductivity of gas, μ1 is the viscosity coefficient of gas, C p1 is the specific heat capacity of the gas, T H1 is the temperature of the first heating resistor, T G1 is the measured gas temperature, K1, m and n are all constants; Q a is the mass flow rate of air, H2 is the heat dissipation of the second heating resistor, λ2 is the thermal conductivity of air, μ2 is the viscosity coefficient of air, C p2 is the specific heat capacity of air, T H2 is the temperature of the second heating resistor, T G2 is the measured air temperature; K2, x and y are all constants.

[0014] Optionally, the burner is further provided with an ignition and fire detection needle, and the ignition and fire detection needle is electrically connected to the controller.

[0015] Another aspect of the present application provides a method for controlling a gas appliance, which is applied to the gas appliance described above. The method includes:

[0016] Obtain the gas flow detected by the gas flow sensor and the air flow detected by the air flow sensor;

[0017] Open the gas proportional valve and speed regulating fan to ignite the burner;

[0018] The rotation speed of the speed-regulating fan is controlled according to the gas flow detected by the gas flow sensor, so that the ratio of the gas flow of the gas passing through the gas pipeline to the air flow of the air passing through the air pipeline is within a preset range.

[0019] Optionally, when the gas flow sensor includes a first temperature measuring resistor and a first heating resistor respectively connected to the controller, obtaining the flow rate detected by the gas flow sensor includes:

[0020] The gas flow rate is calculated using the following formula:

[0021]

[0022] Among them, Q g is the mass flow rate of gas, H1 is the heat dissipation of the first heating resistor, λ1 is the thermal conductivity of gas, μ1 is the viscosity coefficient of gas, C p1 is the specific heat capacity of the gas, T H1 is the temperature of the first heating resistor, T G1 is the measured gas temperature, K1, m and n are all constants.

[0023] Optionally, when the air flow sensor includes a second temperature measuring resistor and a second heating resistor respectively connected to the controller, obtaining the flow rate detected by the air flow sensor includes:

[0024] The air flow rate is calculated using the following formula:

[0025]

[0026] Among them, Q a is the mass flow rate of air, H2 is the heat dissipation of the second heating resistor, λ2 is the thermal conductivity of air, μ2 is the viscosity coefficient of air, C p2 is the specific heat capacity of air, T H2 is the temperature of the second heating resistor, T G2 is the measured air temperature; K2, x and y are all constants.

[0027] Optionally, before opening the gas proportional valve and the speed regulating fan to ignite the burner, the method further includes:

[0028] Detecting whether the gas flow rate and the air flow rate are within a preset range near 0;

[0029] If yes, perform zero point calibration on the gas flow sensor and the air flow sensor;

[0030] If not, a fault alarm is triggered.

[0031] Optionally, when the burner is further provided with an ignition and fire detection pin electrically connected to the controller, the ignition operation of the burner includes:

[0032] Output high voltage pulses to the ignition and flame detection pins, and continuously monitor whether the flame exists.

[0033] The beneficial effects of the embodiments of the present application include:

[0034] The gas appliance and control method provided in the embodiments of the present application utilize a gas flow sensor and a gas proportional valve disposed on the gas pipeline, and an air flow sensor and a speed-regulating fan disposed on the air pipeline. The gas pipeline and the air pipeline are respectively connected to the burner. When the gas is burning at the burner, the controller can control the opening of the gas proportional valve and the speed of the speed-regulating fan based on the flow rates detected by the gas flow sensor and the air flow sensor, thereby maintaining the combustion power and air-fuel ratio within a preset range. This can significantly improve the combustion efficiency and exhaust gas emission levels of the gas appliance. Compared to conventional configurations, the above-described method can monitor the air and gas flow rates in real time and better control the combustion power and air-fuel ratio based on the above-described flow rates. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A schematic diagram of the structure of a gas appliance provided in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the structure of a gas flow sensor (air flow sensor) provided in an embodiment of the present application;

[0038] Figure 3 This is a flow chart of a method for controlling a gas appliance according to an embodiment of the present application;

[0039] Figure 4 This is the second flow chart of the gas appliance control method provided in the embodiment of the present application.

[0040] Icons: 110-burner; 120-gas pipeline; 130-air pipeline; 140-gas flow sensor; 142-first temperature measuring resistor; 144-first heating resistor; 150-gas proportional valve; 160-air flow sensor; 162-second temperature measuring resistor; 164-second heating resistor; 170-speed regulating fan; 180-controller; 190-ignition and fire detection needle. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0044] In the description of this application, it should be noted that the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0045] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0046] Please refer to Figure 1This embodiment provides a gas appliance, including a burner 110, and a gas pipe 120 and an air pipe 130 respectively connected to the burner 110; a gas flow sensor 140 and a gas proportional valve 150 are respectively provided on the gas pipe 120; an air flow sensor 160 and a speed-regulating fan 170 are respectively provided on the air pipe 130; wherein the gas flow sensor 140, the gas proportional valve 150, the air flow sensor 160 and the speed-regulating fan 170 are respectively electrically connected to a controller 180, and the controller 180 is used to control the opening of the gas proportional valve 150 and the speed of the speed-regulating fan 170 according to the flow rates detected by the gas flow sensor 140 and the air flow sensor 160.

[0047] Specifically, by connecting the gas pipeline 120 and the air pipeline 130 to the burner 110 respectively, the gas and air can be mixed and ignited to meet the required heating needs. By connecting the gas proportional valve 150 and the gas flow sensor 140 on the gas pipeline 120 to the controller 180 respectively, the controller 180 can obtain the gas flow through the gas pipeline 120 and control the opening of the proportional valve, so that the gas passing through the gas pipeline 120 has more flexible control and regulation capabilities. In addition, the embodiment of the present application does not specifically limit the setting position of the gas flow sensor 140. For example, the gas flow sensor 140 can be set at the gas source inlet ( Figure 1 The position shown by the arrow in the middle) and the gas proportional valve 150, or can be set between the gas proportional valve 150 and the burner 110. In practical applications, it can be flexibly set according to convenience and actual needs.

[0048] Similarly, by connecting the speed-regulating fan 170 and the air flow sensor 160 on the air duct 130 to the controller 180, respectively, the controller 180 can obtain the air flow through the air duct 130 and control the rotation speed of the speed-regulating fan 170, so that the air passing through the air duct 130 has more flexible control and regulation capabilities. In addition, the embodiment of the present application does not specifically limit the location of the air flow sensor 160. For example, the air flow sensor 160 can be set between the outlet of the speed-regulating fan 170 and the burner 110, or it can be set at the air inlet of the speed-regulating fan 170. In actual application, it can be flexibly set according to convenience and actual needs. It is understandable that when the air inlet of the speed-regulating fan 170 is open, it is set after the air outlet of the speed-regulating fan 170. Among them, the controller 180 can use a single-chip microcomputer to reduce production costs.

[0049] The gas appliance provided in the embodiment of the present application has a gas flow sensor 140 and a gas proportional valve 150 disposed on the gas pipe 120, and an air flow sensor 160 and a speed-regulating fan 170 disposed on the air pipe 130. When the gas pipe 120 and the air pipe 130 are respectively connected to the burner 110, the controller 180 can control the opening of the gas proportional valve 150 and the speed of the speed-regulating fan 170 according to the flow rates detected by the gas flow sensor 140 and the air flow sensor 160 when the gas is burning at the burner 110, so that the combustion power and air-fuel ratio are maintained within a preset range, which can greatly improve the combustion efficiency and exhaust gas emission level of the gas appliance. Compared with conventional configurations, the above-mentioned method can monitor the air and gas flow rates in real time and better control the combustion power and air-fuel ratio according to the above-mentioned flow rates.

[0050] like Figure 2 As shown, the gas flow sensor 140 includes a first temperature measuring resistor 142 and a first heating resistor 144 respectively connected to the controller 180. The first temperature measuring resistor 142 is used to measure the temperature of the gas. The controller 180 is used to control the first heating resistor 144 to generate heat according to the temperature measured by the first temperature measuring resistor 142, and make the temperature of the first heating resistor 144 greater than the temperature measured by the first temperature measuring resistor 142, so as to obtain the gas flow through the controller 180.

[0051] Specifically, the first temperature measuring resistor 142 can be a positive temperature coefficient thermistor (PTC) or a negative temperature coefficient thermistor (NTC), and the first heating resistor 144 can be a PTC thermistor. When the first temperature measuring resistor 142 and the first heating resistor 144 are in the gas flow, the first temperature measuring resistor 142 measures the gas flow temperature. At this time, the current passing through the first temperature measuring resistor 142 is small, and self-heating can be ignored. The controller 180 can calculate the corresponding temperature, i.e., the gas flow temperature, by measuring the resistance value of the first temperature measuring resistor 142. At the same time, by controlling the voltage across the first heating resistor 144, the temperature of the first heating resistor 144 is set to be higher than the temperature of the first temperature measuring resistor 142 by a certain amount. The controller 180 can derive the calorific value of the first heating resistor 144 based on the voltage across the first heating resistor 144 and the current passing through the first heating resistor 144, thereby obtaining the heat removed by the gas flow through the surface of the first heating resistor 144. According to the above physical parameters, the flow rate of the gas to be detected can be obtained.

[0052] Please continue to refer to Figure 2The air flow sensor 160 includes a second temperature measuring resistor 162 and a second heating resistor 164 respectively connected to the controller 180. The second temperature measuring resistor 162 is used to measure the temperature of the air. The controller 180 is used to control the second heating resistor 164 to generate heat according to the temperature measured by the second temperature measuring resistor 162, and make the temperature of the second heating resistor 164 greater than the temperature measured by the second temperature measuring resistor 162, so as to obtain the air flow through the controller 180.

[0053] Similarly, the second temperature measuring resistor 162 can be a PTC or NTC thermistor, and the second heating resistor 164 can be a PTC thermistor. When the second temperature measuring resistor 162 and the second heating resistor 164 are in the air flow, the second temperature measuring resistor 162 measures the air flow temperature. At this time, the current passing through the second temperature measuring resistor 162 is small, and self-heating can be ignored. The controller 180 can calculate the corresponding temperature, that is, the air flow temperature, by measuring the resistance of the second temperature measuring resistor 162. At the same time, by controlling the voltage across the second heating resistor 164, the temperature of the second heating resistor 164 is made higher than the temperature of the second temperature measuring resistor 162 by a certain amount. The controller 180 can derive the heat generated by the second heating resistor 164 based on the voltage across the second heating resistor 164 and the current passing through the second heating resistor 164, thereby obtaining the heat carried away by the air flow through the surface of the second heating resistor 164. Based on the above physical parameters, the air flow required for detection can be obtained.

[0054] In an optional embodiment of the present application, the gas flow rate and the air flow rate are obtained by the following formula:

[0055]

[0056]

[0057] Among them, Q g is the mass flow rate of the gas, H1 is the heat dissipation of the first heating resistor 144, λ1 is the thermal conductivity of the gas, μ1 is the viscosity coefficient of the gas, C p1 is the specific heat capacity of the gas, T H1 is the temperature of the first heating resistor 144, T G1 is the measured gas temperature, K1, m and n are all constants; Q a is the mass flow rate of air, H2 is the heat dissipation of the second heating resistor 164, λ2 is the thermal conductivity of air, μ2 is the viscosity coefficient of air, C p2 is the specific heat capacity of air, T H2 is the temperature of the second heating resistor 164, T G2 is the measured air temperature; K2, x and y are all constants.

[0058] It should be noted that K1 and K2 are thermal conductivity coefficients, which are related to the properties of the gas itself. m and n are also constants, which are related to the properties of the gas and the Reynolds coefficient. In addition, x and y are also constants, which are related to the properties of air and the Reynolds coefficient.

[0059] like Figure 1 As shown, the burner 110 is further provided with an ignition and fire detection needle 190 , which is electrically connected to the controller 180 .

[0060] Specifically, the ignition and fire detection needle 190 electrically connected to the controller 180 can ignite the gas introduced into the burner 110 and detect whether the flame exists. The above method is conducive to ensuring the stability of ignition.

[0061] like Figure 3 As shown, the embodiment of the present application further discloses a gas appliance control method, which is applied to the gas appliance in the aforementioned embodiment. The method includes:

[0062] S100 : Obtain the gas flow detected by the gas flow sensor 140 , and obtain the air flow detected by the air flow sensor 160 .

[0063] S200 , opening the gas proportional valve 150 and the speed-regulating fan 170 to ignite the burner 110 .

[0064] S300 , controlling the rotation speed of the speed-regulating fan 170 according to the gas flow detected by the gas flow sensor 140 , so that the ratio of the gas flow through the gas pipe 120 to the air flow through the air pipe 130 is within a preset range.

[0065] This approach can significantly improve the combustion efficiency and exhaust emissions of gas appliances. Compared to conventional setups, it can monitor air and gas flow rates in real time, and better control combustion power and air-fuel ratio based on these flow rates.

[0066] In an optional embodiment of the present application, when the gas flow sensor 140 includes a first temperature measuring resistor 142 and a first heating resistor 144 respectively connected to the controller 180, obtaining the flow detected by the gas flow sensor 140 includes:

[0067] The gas flow rate is calculated using the following formula:

[0068]

[0069] Among them, Q g is the mass flow rate of the gas, H1 is the heat dissipation of the first heating resistor 144, λ1 is the thermal conductivity of the gas, μ1 is the viscosity coefficient of the gas, C p1 is the specific heat capacity of the gas, T H1is the temperature of the first heating resistor 144, T G1 is the measured gas temperature, K1, m and n are all constants.

[0070] According to the above formula, the gas mass flow rate Q can be obtained g , so as to cooperate with the controller 180 and the gas proportional valve 150 to achieve closed-loop control of the gas.

[0071] In an optional embodiment of the present application, when the air flow sensor 160 includes a second temperature measuring resistor 162 and a second heating resistor 164 respectively connected to the controller 180, obtaining the flow rate detected by the air flow sensor 160 includes:

[0072] The air flow rate is calculated using the following formula:

[0073]

[0074] Among them, Q a is the mass flow rate of air, H2 is the heat dissipation of the second heating resistor 164, λ2 is the thermal conductivity of air, μ2 is the viscosity coefficient of air, C p2 is the specific heat capacity of air, T H2 is the temperature of the second heating resistor 164, T G2 is the measured air temperature; K2, x and y are all constants.

[0075] According to the above formula, the mass flow rate Q of air can be obtained a , so that the ratio of gas flow rate to air flow rate is adapted. It can be understood that, taking methane as an example, the combustion molar ratio of gas and oxygen is 1:2. According to the content of oxygen in the air, in order to ensure the full combustion of methane, the air-fuel ratio needs to be adjusted. It is close to 1:10. In practical applications, the appropriate air-fuel ratio range can be determined as needed.

[0076] like Figure 4 As shown, in an optional embodiment of the present application, before the above-mentioned opening of the gas proportional valve 150 and the speed regulating fan 170 and the ignition operation of the burner 110, the method further includes:

[0077] Check whether the gas flow rate and air flow rate are within the preset range near 0;

[0078] If yes, perform zero point calibration on the gas flow sensor 140 and the air flow sensor 160;

[0079] If not, a fault alarm is triggered.

[0080] The above-described method can improve the accuracy of flow detection and detect whether there is a gas leak when the gas proportional valve 150 is closed, which helps improve safety during use. It is understood that during zero-point calibration, if the gas proportional valve 150 and the speed-regulating fan 170 are closed and the detected gas flow and air flow meet the set thresholds, the current parameters are used as the zero point count, i.e., zeroing is performed, thereby improving detection accuracy.

[0081] In an optional embodiment of the present application, when the burner 110 is further provided with an ignition and fire detection pin 190 electrically connected to the controller 180, the ignition operation of the burner 110 includes:

[0082] Output high voltage pulses to the ignition and flame detection pins 190 and continuously monitor whether the flame exists.

[0083] The above method is adopted to ensure efficient ignition and improve ignition stability.

[0084] In summary, the gas appliance and control method provided by the embodiments of the present application utilize two pairs of low-cost thermistors to detect the mass flow rates of air and gas, respectively. This ensures that combustion power and the air-fuel ratio remain within the desired range, ensuring stable ignition and combustion and accurate power control. This results in more stable product performance, less susceptibility of combustion power and the air-fuel ratio to external factors, more complete gas combustion, reduced carbon and nitrogen oxide emissions, and gas conservation. Furthermore, the system can detect gas leaks when the gas proportional valve 150 is closed, enhancing system safety.

[0085] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A gas appliance, characterized in that: The burner comprises a burner, and a gas pipeline and an air pipeline respectively connected to the burner; the gas pipeline is respectively provided with a gas flow sensor and a gas proportional valve; the air pipeline is respectively provided with an air flow sensor and a speed-regulating fan; wherein the gas flow sensor, the gas proportional valve, the air flow sensor and the speed-regulating fan are respectively electrically connected to a controller, and the controller is used to control the opening of the gas proportional valve and the speed of the speed-regulating fan according to the flow rates detected by the gas flow sensor and the air flow sensor; The gas flow sensor includes a first temperature measuring resistor and a first heating resistor respectively connected to the controller, the first temperature measuring resistor being used to measure the temperature of the gas, and the controller being used to control the first heating resistor to generate heat according to the temperature measured by the first temperature measuring resistor, and to make the temperature of the first heating resistor greater than the temperature measured by the first temperature measuring resistor, so as to obtain the gas flow through the controller; The gas flow rate is obtained by the following formula: ;in, is the mass flow rate of gas, is the heat dissipation of the first heating resistor, is the thermal conductivity of the gas, is the gas viscosity coefficient, is the specific heat capacity of the gas, is the temperature of the first heating resistor, is the measured gas temperature, , m and n are all constants.

2. The gas appliance according to claim 1, characterized in that: The air flow sensor includes a second temperature measuring resistor and a second heating resistor respectively connected to the controller, the second temperature measuring resistor is used to measure the temperature of the air, and the controller is used to control the second heating resistor to generate heat according to the temperature measured by the second temperature measuring resistor, and make the temperature of the second heating resistor greater than the temperature measured by the second temperature measuring resistor, so as to obtain the air flow through the controller.

3. The gas appliance according to claim 2, characterized in that: The air flow rate is obtained by the following formula: ； in, is the mass flow rate of air, is the heat dissipation of the second heating resistor, is the thermal conductivity of air, is the air viscosity coefficient, is the specific heat capacity of air, is the temperature of the second heating resistor, is the measured air temperature; , x, and y are all constants.

4. The gas appliance according to any one of claims 1 to 3, characterized in that: The burner is also provided with an ignition and fire detection needle, and the ignition and fire detection needle is electrically connected to the controller.

5. A method for controlling a gas appliance, characterized in that: Applied to the gas appliance according to any one of claims 1 to 4, the method comprises: Obtain the gas flow detected by the gas flow sensor and the air flow detected by the air flow sensor; Open the gas proportional valve and speed regulating fan to ignite the burner; controlling the rotation speed of the speed-regulating fan according to the gas flow detected by the gas flow sensor so that the ratio of the gas flow through the gas pipeline to the air flow through the air pipeline is within a preset range; When the gas flow sensor includes a first temperature measuring resistor and a first heating resistor respectively connected to the controller, obtaining the flow rate detected by the gas flow sensor includes: The gas flow rate is calculated using the following formula: ； in, is the mass flow rate of gas, is the heat dissipation of the first heating resistor, is the thermal conductivity of the gas, is the gas viscosity coefficient, is the specific heat capacity of the gas, is the temperature of the first heating resistor, is the measured gas temperature, , m and n are all constants.

6. The gas appliance control method according to claim 5, characterized in that: When the air flow sensor includes a second temperature measuring resistor and a second heating resistor respectively connected to the controller, obtaining the flow rate detected by the air flow sensor includes: The air flow rate is calculated using the following formula: ； in, is the mass flow rate of air, is the heat dissipation of the second heating resistor, is the thermal conductivity of air, is the air viscosity coefficient, is the specific heat capacity of air, is the temperature of the second heating resistor, is the measured air temperature; , x, and y are all constants.

7. The gas appliance control method according to claim 6, characterized in that: Before opening the gas proportional valve and the speed regulating fan to ignite the burner, the method further includes: Detecting whether the gas flow rate and the air flow rate are within a preset range near 0; If yes, perform zero point calibration on the gas flow sensor and the air flow sensor; If not, a fault alarm is triggered.

8. The gas appliance control method according to claim 5, characterized in that: When the burner is further provided with an ignition and fire detection pin electrically connected to the controller, the ignition operation of the burner includes: Output high voltage pulses to the ignition and flame detection pins, and continuously monitor whether the flame exists.

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