Control method of gas water heater

Abstract

The invention relates to a control method of a gas water heater, which comprises the following steps: in the process that the gas water heater operates according to a load configuration table, when the current of a proportional valve is monitored to change, acquiring a current variation and a first real-time fan gear corresponding to the current before the current is changed; the real-time fan rotating speed of the fan is obtained, and the rotating speed offset between the real-time fan rotating speed and the fan rotating speed corresponding to the changed current recorded in the load configuration table is determined; if it is judged that the load change of the gas water heater is too large and the rotating speed offset exceeds the preset rotating speed threshold value, a second real-time fan gear corresponding to the changed current is obtained; the gas water heater is controlled to execute the air adding quitting process, and the fan gear of the fan is switched from the first real-time fan gear to the second real-time fan gear; or the fan gear of the fan is switched from the second real-time fan gear to the first real-time fan gear. According to the method, program misjudgment can be effectively avoided, so that the normal use requirement of a user can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent household appliances, and in particular to a control method for a gas water heater. Background Art

[0002] Constant current control of gas water heaters is a technology that controls water heater components by precisely adjusting the current, especially for driving certain key components, such as proportional valves or fans, to achieve the purpose of maintaining stable operation of the water heater and precise temperature control.

[0003] Specifically, constant current control is mainly reflected in the following aspects: 1) Control the current of the proportional valve: dynamically adjust the current of the proportional valve according to the water temperature set by the user and the water temperature detected in real time, so as to maintain the stability of the outlet water temperature. 2) Control the speed of the fan: adjust the speed of the fan by changing the current supplied to the motor. This ensures that there is enough oxygen supply in the combustion chamber and maintains the optimal gas-air mixing ratio, which can not only ensure combustion efficiency, but also achieve energy conservation and emission reduction.

[0004] In the prior art, according to the constant current control principle, when the speed of the fan reaches a certain offset, the main controller will automatically increase the current of the fan to meet the speed requirement. At this time, the program has identified that the fan is adding air, and the fan gear and speed are high. When the load of the gas water heater changes significantly, the program may make a misjudgment, and may not meet the needs of normal use of the user in the end. For example, when the load of the gas water heater is greatly reduced, due to the inertia problem of the fan, the current of the fan can only be slowly reduced. In this process, if the higher speed has met the air addition condition relative to the lower speed, the program will make a misjudgment, resulting in the current of the proportional valve being low and the speed of the fan being high, and the whole machine may eventually flame out. For another example, when the load of the gas water heater increases significantly, the whole machine may have a blockage problem, and the speed of the fan will also increase significantly. At this time, if the blockage problem of the whole machine disappears, then using a higher speed value will inevitably waste energy, and will also increase noise and wear. Summary of the invention

[0005] The technical problem solved by the present invention is to provide a control method for a gas water heater, which can effectively avoid program misjudgment, thereby meeting the needs of users for normal use.

[0006] The above technical problems are solved by the following technical solutions:

[0007] A control method for a gas water heater, wherein a load configuration table is provided in the gas water heater, wherein the load configuration table includes a set of correspondences among proportional valve current, fan speed and fan gear position, wherein the set of correspondences is at least divided into: a normal operating interval and a blocked air supply interval; the same fan gear position corresponds to a first fan speed range and a second fan speed range in the normal operating interval and the blocked air supply interval, respectively; the maximum fan speed in the first fan speed range is less than or equal to the minimum fan speed in the second fan speed range; the method includes:

[0008] During the operation of the gas water heater according to the load configuration table, when it is monitored that the current of the proportional valve changes within a unit time, the current change amount and the first real-time fan gear corresponding to the current before the change are obtained;

[0009] Obtaining a real-time fan speed of the fan, and determining a speed offset between the real-time fan speed and the fan speed corresponding to the changed current recorded in the load configuration table;

[0010] If it is determined according to the current change that the load change of the gas water heater is too large, and the speed offset exceeds the preset speed threshold, then a second real-time fan gear corresponding to the changed current is obtained, wherein the first real-time fan gear is the fan gear after the gas water heater executes the air-adding process according to the corresponding relationship of the blocked air-adding interval and the second real-time fan gear is increased by at least one gear;

[0011] Controlling the gas water heater to execute the air supply exit process, so that the gas water heater exits the process of upgrading the second real-time fan gear according to the corresponding relationship of the blocked air supply interval, and switches the fan gear of the fan from the first real-time fan gear to the second real-time fan gear;

[0012] Alternatively, if it is determined based on the current change that the load change of the gas water heater is too large, and the speed offset exceeds the preset speed threshold, then the second real-time fan gear corresponding to the changed current is obtained, and the second real-time fan gear is the fan gear after the gas water heater executes the air adding process according to the correspondence between the blocked air adding interval and the first real-time fan gear is increased by at least one gear; the gas water heater is controlled to execute the air adding exit process, so that the gas water heater exits the process of increasing the gear of the first real-time fan gear according to the correspondence between the blocked air adding interval, and the fan gear of the fan is switched from the second real-time fan gear to the first real-time fan gear.

[0013] The control method of the gas water heater described in the present invention, during the operation of the gas water heater according to the load configuration table, when it is monitored that the current of the proportional valve changes within a unit time, first obtain the current change amount and the first real-time fan gear corresponding to the current before the change; then obtain the real-time fan speed of the fan, and determine the speed offset between the real-time fan speed and the fan speed corresponding to the changed current recorded in the load configuration table; if it is determined that the load change of the gas water heater is too large according to the current change amount, and the speed offset exceeds the preset speed threshold, then obtain the second real-time fan gear corresponding to the changed current, the first real-time fan gear is the fan gear after the gas water heater executes the air addition process according to the corresponding relationship of the blocked air addition interval and the second real-time fan gear is increased by at least one gear; then control the gas water heater to execute the air addition exit process, so as to The gas water heater is made to exit the process of increasing the gear of the second real-time fan according to the correspondence of the blocked air-adding interval, and the fan gear of the fan is switched from the first real-time fan gear to the second real-time fan gear; or, if it is determined that the load change of the gas water heater is too large according to the current change, and the speed offset exceeds the preset speed threshold, the second real-time fan gear corresponding to the changed current is obtained, and the second real-time fan gear is the fan gear after the gas water heater executes the air-adding process according to the correspondence of the blocked air-adding interval and increases the first real-time fan gear by at least one gear; the gas water heater is controlled to execute the air-adding exit process, so that the gas water heater exits the process of increasing the gear of the first real-time fan according to the correspondence of the blocked air-adding interval, and the fan gear of the fan is switched from the second real-time fan gear to the first real-time fan gear. Compared with the background technology, the beneficial effect is that when the load of the gas water heater changes significantly, the gas water heater can be controlled to exit the process of increasing the fan gear according to the corresponding relationship of the blocked air-adding interval, thereby effectively avoiding the phenomenon of the gas water heater being shut down due to program misjudgment, and can also effectively solve the problem of resource waste caused by program misjudgment, thereby meeting the normal use needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure of a gas water heater provided in one embodiment of the present application;

[0015] Figure 2 A schematic diagram of the corresponding relationship between the proportional valve current, the fan speed and the fan gear position provided in an embodiment of the present application;

[0016] Figure 3 A flow chart of a method for controlling a gas water heater provided in one embodiment of the present application;

[0017] Figure 4 A schematic flow chart of a control method for a gas water heater provided in another embodiment of the present application;

[0018] Figure 5 A flow chart of a control method for a gas water heater provided in yet another embodiment of the present application;

[0019] Figure 6 A schematic diagram of the structure of a gas water heater provided in one embodiment of the present application;

[0020] Figure 7 A schematic structural diagram of a gas water heater provided in another embodiment of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in 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. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] Gas water heater: used to heat water to provide hot water supply for homes, hotels, apartments and other places. Gas water heaters generate heat energy by burning gas, and then transfer the heat energy to the water flow through a heat exchanger to heat the cold water. Gas water heaters control ignition through water flow sensors or chips, and the temperature changes continuously during the process of heating water. Compared with traditional electric water heaters, gas water heaters have the following advantages: a) Fast heating: gas water heaters use gas for heating, which has a fast heating speed and can provide hot water in a shorter time. b) High efficiency: gas water heaters have high thermal efficiency and can convert the energy of gas into heat energy, which is more energy-saving. c) Cost saving: gas prices are relatively low, and using gas water heaters can save usage costs. d) Large amount of hot water: gas water heaters have a large amount of hot water, which can meet the needs of household use.

[0026] Figure 1 This is a schematic diagram of the structure of a gas water heater provided in one embodiment of the present application. Figure 1 As shown, the gas water heater in the embodiment of the present application may include: a main controller, a fan and a combustion system; wherein the main controller is one of the core components of the entire system, and it is mainly responsible for the following functions: 1) Temperature control: monitor the water inlet temperature and the water outlet temperature, and adjust the gas supply according to the target temperature set by the user to ensure that the water outlet temperature is stable. 2) Ignition control: When the user turns on the hot water tap, the controller triggers the ignition device, such as a pulse igniter, to ignite the burner. After the ignition is successful, the controller continues to monitor the presence of the flame to ensure that the burner continues to work. 3) Safety protection: implement a variety of safety protection measures, such as overheating protection, hypoxia protection, anti-dry burning protection, etc. If any unsafe situation is detected, such as excessive water temperature or lack of oxygen in the combustion chamber, the controller will immediately cut off the gas supply to prevent accidents. 4) Fault diagnosis: monitor the various components in the system, such as burners, fans, water valves, etc., and can identify and display fault codes, so that maintenance personnel can quickly locate problems. The main functions of the fan in a gas water heater include: 1) Combustion support: The fan draws outside air into the water heater to provide sufficient oxygen for the combustion process. By adjusting the speed of the fan, the amount of air entering the combustion chamber can be controlled, thereby affecting the combustion efficiency and gas consumption. 2) Smoke exhaust: The combustion process produces waste gas, mainly including carbon dioxide, water vapor, etc. The fan is responsible for exhausting these waste gases to the outside of the water heater to ensure that no harmful gases accumulate inside the water heater. The combustion system is used to mix gas and air and ignite them to generate heat to heat the water.

[0027] Embodiment 1

[0028] Figure 2 This is a schematic diagram of the corresponding relationship between the proportional valve current, the fan speed and the fan gear provided in an embodiment of the present application. Figure 2As shown, a load configuration table is provided in the gas water heater in the embodiment of the present application, and the load configuration table includes a corresponding relationship set of proportional valve current, fan speed and fan gear position. In one embodiment, the corresponding relationship set can be divided into: normal operating interval and blocked air adding interval; the same fan gear position corresponds to the first fan speed range and the second fan speed range in the normal operating interval and the blocked air adding interval respectively; the maximum fan speed of the first fan speed range is less than or equal to the minimum fan speed of the second fan speed range. In another example, the corresponding relationship set can be divided into: normal operating interval, blocked air adding interval and speed offset interval between the normal operating interval and the blocked air adding interval. The same fan gear position corresponds to the first fan speed range, the second fan speed range and the third fan speed range in the normal operating interval, the blocked air adding interval and the speed offset interval respectively; the maximum fan speed of the first fan speed range is less than or equal to the minimum fan speed of the third fan speed range; the maximum fan speed of the third fan speed range is less than or equal to the minimum fan speed of the second fan speed range. The normal operating range in the embodiment of the present application refers to the working range of the water heater under standard conditions. Within this range, the gas water heater can operate at optimal efficiency, and the combustion process is stable, and the exhaust gas generated meets the emission standards. The blocked air-adding interval refers to when the combustion system or exhaust system of the gas water heater is partially blocked. In order to compensate for the impact of such blockage, the system will increase the ventilation volume, that is, increase the speed of the fan to ensure sufficient oxygen supply to maintain the combustion process. The speed offset interval is located between the normal operating interval and the blocked air-adding interval. It is a transition area. In this area, the fan speed begins to gradually increase to cope with possible minor blockages or other factors that lead to reduced combustion efficiency. The setting of the speed offset interval can help the system smoothly transition from a normal operating state to a state that requires more ventilation.

[0029] Figure 3 This is a flow chart of a method for controlling a gas water heater provided in one embodiment of the present application. The method can be executed by a control device of a gas water heater or a gas water heater. Figure 3 As shown, the control method of the gas water heater may include the following steps:

[0030] S301. When the gas water heater is running according to the load configuration table, when it is monitored that the current of the proportional valve changes within a unit time, the current change amount and the first real-time fan gear corresponding to the current before the change are obtained.

[0031] In a specific embodiment of the present application, the current of the proportional valve can be greatly reduced or greatly increased per unit time. Figure 2As shown, in one example, when the current of the proportional valve is greatly reduced within a unit time, the current before the change is 150, and the first real-time fan gear corresponding to the current before the change is 50; the current after the change is 120, and the second real-time fan gear corresponding to the current after the change is 10; the current change is 150-120=30. In another embodiment, when the current of the proportional valve is greatly increased within a unit time, the current before the change is 120, and the first real-time fan gear corresponding to the current before the change is 10; the current after the change is 150, and the second real-time fan gear corresponding to the current after the change is 50; the current change is |120-150|=30.

[0032] S302: Acquire the real-time fan speed of the fan, and determine the speed offset between the real-time fan speed and the fan speed corresponding to the changed current recorded in the load configuration table.

[0033] like Figure 2 As shown, in one embodiment, the current of the proportional valve is greatly reduced per unit time, the real-time fan speed of the fan is 1500, the fan speed corresponding to the changed current is 800, and the speed offset between the real-time fan speed and the fan speed corresponding to the changed current recorded in the load configuration table is 1500-800=700.

[0034] S303. If it is determined based on the current change that the load change of the gas water heater is too large and the speed offset exceeds the preset speed threshold, then the second real-time fan gear corresponding to the changed current is obtained. The first real-time fan gear is the fan gear after the gas water heater executes the air adding process according to the corresponding relationship of the blocked air adding interval and the second real-time fan gear is increased by at least one gear.

[0035] In this step, it is determined based on the current change whether the load change of the gas water heater is too large. The following method can be used to determine: if the current change exceeds the preset current change threshold, it can be determined that the load change of the gas water heater is too large; if the current change does not exceed the preset current change threshold, it can be determined that the load change of the gas water heater is not too large.

[0036] like Figure 2 As shown, in one embodiment, the current of the proportional valve is greatly reduced in unit time, the first real-time fan gear is 50, and the first real-time fan gear is the fan gear corresponding to the current before the change; the second real-time fan gear is 10; the second real-time fan gear is the fan gear corresponding to the current after the change. In another embodiment, the current of the proportional valve is greatly increased in unit time, the first real-time fan gear is 50, and the first real-time fan gear is the fan gear corresponding to the current after the change; the second real-time fan gear is 10, and the second real-time fan gear is the fan gear corresponding to the current before the change.

[0037] S304, control the gas water heater to execute the air addition exit process, so that the gas water heater exits the process of upgrading the second real-time fan gear according to the correspondence between the blocked air addition intervals, and switches the fan gear of the fan from the first real-time fan gear to the second real-time fan gear.

[0038] In one embodiment, Figure 2 As shown, the gas water heater is controlled to execute the air-adding exit process, and the fan gear of the fan is switched from the first real-time fan gear 50 to the second real-time fan gear 10. It should be noted that the principle of misjudgment caused by the large reduction and large increase of the current of the proportional valve in the embodiment of the present application in the unit time is different. When the current of the proportional valve is greatly reduced in the unit time, due to the inertia problem of the fan, the current of the fan can only be slowly reduced. In this process, if the higher speed has met the air-adding condition relative to the lower speed, the program will be misjudged at this time, resulting in the current of the proportional valve being low and the speed of the fan being high, and the whole machine may eventually flame out. When the current of the proportional valve is greatly increased in the unit time, the whole machine may have a blockage problem, and the speed of the fan will also be greatly increased. At this time, if the blockage problem of the whole machine disappears, then using a higher speed value will inevitably waste energy, and will also increase noise and wear. Therefore, controlling the gas water heater to execute the air-adding exit process can effectively avoid resource waste and reduce noise and wear.

[0039] S305. If it is determined based on the current change that the load change of the gas water heater is too large and the speed offset exceeds the preset speed threshold, then the second real-time fan gear corresponding to the changed current is obtained. The second real-time fan gear is the fan gear after the gas water heater executes the air adding process according to the corresponding relationship of the blocked air adding interval and the first real-time fan gear is increased by at least one gear.

[0040] S306, controlling the gas water heater to execute the air addition exit process, so that the gas water heater exits the process of upgrading the first real-time fan gear according to the correspondence between the blocked air addition intervals, and switches the fan gear of the fan from the second real-time fan gear to the first real-time fan gear.

[0041] The control method of the gas water heater described in the present invention, during the operation of the gas water heater according to the load configuration table, when it is monitored that the current of the proportional valve changes within a unit time, first obtain the current change amount and the first real-time fan gear corresponding to the current before the change; then obtain the real-time fan speed of the fan, and determine the speed offset between the real-time fan speed and the fan speed corresponding to the changed current recorded in the load configuration table; if it is determined that the load change of the gas water heater is too large according to the current change amount, and the speed offset exceeds the preset speed threshold, then obtain the second real-time fan gear corresponding to the changed current, the first real-time fan gear is the fan gear after the gas water heater executes the air addition process according to the corresponding relationship of the blocked air addition interval and the second real-time fan gear is increased by at least one gear; then control the gas water heater to execute the air addition exit process, so as to The gas water heater is made to exit the process of increasing the gear of the second real-time fan according to the correspondence of the blocked air-adding interval, and the fan gear of the fan is switched from the first real-time fan gear to the second real-time fan gear; or, if it is determined that the load change of the gas water heater is too large according to the current change, and the speed offset exceeds the preset speed threshold, the second real-time fan gear corresponding to the changed current is obtained, and the second real-time fan gear is the fan gear after the gas water heater executes the air-adding process according to the correspondence of the blocked air-adding interval and increases the first real-time fan gear by at least one gear; the gas water heater is controlled to execute the air-adding exit process, so that the gas water heater exits the process of increasing the gear of the first real-time fan according to the correspondence of the blocked air-adding interval, and the fan gear of the fan is switched from the second real-time fan gear to the first real-time fan gear. Compared with the background technology, the beneficial effect is that when the load of the gas water heater changes significantly, the gas water heater can be controlled to exit the process of increasing the fan gear according to the corresponding relationship of the blocked air-adding interval, thereby effectively avoiding the phenomenon of the gas water heater being shut down due to program misjudgment, and can also effectively solve the problem of resource waste caused by program misjudgment, thereby meeting the normal use needs of users.

[0042] Embodiment 2

[0043] Figure 4 This is a flow chart of a control method for a gas water heater provided in another embodiment of the present application. It is further optimized and expanded based on the above technical solution and can be combined with the above optional implementation methods. Figure 4 As shown, the control method of the gas water heater may include the following steps:

[0044] S401. When the gas water heater is running according to the load configuration table, when it is detected that the current of the proportional valve changes within a unit time, the current change amount and the first real-time fan gear corresponding to the current before the change are obtained.

[0045] S402: Acquire the real-time fan speed of the fan, and determine the speed offset between the real-time fan speed and the fan speed corresponding to the changed current recorded in the load configuration table.

[0046] S403. If it is determined based on the current change that the load change of the gas water heater is too large and the speed offset exceeds the preset speed threshold, then the second real-time fan gear corresponding to the changed current is obtained. The first real-time fan gear is the fan gear after the gas water heater executes the air adding process according to the corresponding relationship of the blocked air adding interval and the second real-time fan gear is increased by at least one gear.

[0047] S404, control the gas water heater to execute the air addition exit process, so that the gas water heater exits the process of upgrading the second real-time fan gear according to the correspondence relationship of the blocked air addition interval, and switches the fan gear of the fan from the first real-time fan gear to the second real-time fan gear.

[0048] S405. If it is determined based on the current change that the load change of the gas water heater is too large and the speed offset exceeds the preset speed threshold, then the second real-time fan gear corresponding to the changed current is obtained. The second real-time fan gear is the fan gear after the gas water heater executes the air adding process according to the corresponding relationship of the blocked air adding interval and the first real-time fan gear is increased by at least one gear.

[0049] S406, controlling the gas water heater to execute the air addition exit process, so that the gas water heater exits the process of upgrading the first real-time fan gear according to the correspondence between the blocked air addition intervals, and switches the fan gear of the fan from the second real-time fan gear to the first real-time fan gear.

[0050] S407, after controlling the gas water heater to run for a set time, continue to monitor the current of the proportional valve.

[0051] The proportional valve in a gas water heater is an important control component that is mainly used to adjust the gas flow entering the water heater to achieve precise control of the water temperature. The proportional valve can adjust the gas supply according to the temperature set by the user or the instructions issued by the control system to ensure that the water temperature is stable at the required level. Monitoring the current of the proportional valve of a gas water heater can help determine whether its working state is normal, thereby ensuring the efficiency and safety of the water heater.

[0052] S408: If the current changes within a unit time, and if it is determined that the load change of the gas water heater is still too large based on the current change amount corresponding to the change, continue to execute the air addition exit process.

[0053] In a specific embodiment of the present application, controlling the gas water heater to execute the air addition exit process refers to the process in which the system automatically adjusts the fan speed to a normal operating level under certain conditions. This process usually occurs after the gas water heater detects that the combustion chamber or flue is partially blocked, and therefore increases the fan speed to improve the combustion conditions. In this step, it is determined that the load change of the gas water heater is too large based on the current change. The following method can be used to determine: if the current change exceeds the preset current change threshold, it can be determined that the load change of the gas water heater is too large; if the current change does not exceed the preset current change threshold, it can be determined that the load change of the gas water heater is not too large.

[0054] S409. If the current does not change within the unit time, or if the current changes within the unit time but the load change of the gas water heater is not too large according to the current change amount corresponding to the change, the gas water heater is controlled to execute the air adding process according to the corresponding relationship of the blocked air adding interval.

[0055] In a specific embodiment of the present application, controlling the gas water heater to perform the air-adding process according to the corresponding relationship of the blocked air-adding interval refers to a control strategy for increasing the combustion air supply by increasing the fan speed when a combustion chamber or flue is detected to be partially blocked. This approach can ensure that the gas water heater can still maintain a safe and efficient combustion process in the case of partial blockage.

[0056] The control method of the gas water heater described in the present invention controls the gas water heater to run for a set time, and then continues to monitor the current of the proportional valve; if the current changes within a unit time, and the load change of the gas water heater is still too large according to the current change amount corresponding to the change, the air addition exit process continues to be executed; if the current does not change within a unit time, or the current changes within a unit time, but the load change of the gas water heater is not too large according to the current change amount corresponding to the change, the gas water heater is controlled to execute the air addition process according to the corresponding relationship of the blocked air addition interval. Compared with the background technology, the beneficial effect is that continuing to monitor the current of the proportional valve can ensure that the gas water heater operates safely within the set time period. By monitoring the current of the proportional valve, it can be ensured that the proportional valve is always in a good working state, which helps to extend the overall service life of the gas water heater. In addition, maintaining the good state of the proportional valve can ensure a stable hot water supply and improve user satisfaction.

[0057] Embodiment 3

[0058] Figure 5 A flow chart of a control method for a gas water heater provided in another embodiment of the present application. The above technical solution is further optimized and expanded, and can be combined with the above optional implementation methods. Figure 5 As shown, the control method of the gas water heater may include the following steps:

[0059] S501. When the gas water heater is running according to the load configuration table, when it is monitored that the current of the proportional valve changes within a unit time, the current change amount and the first real-time fan gear corresponding to the current before the change are obtained.

[0060] S502: Acquire the real-time fan speed of the fan, and determine the speed offset between the real-time fan speed and the fan speed corresponding to the changed current recorded in the load configuration table.

[0061] S503. If it is determined based on the current change that the load change of the gas water heater is too large and the speed offset exceeds the preset speed threshold, then the second real-time fan gear corresponding to the changed current is obtained. The first real-time fan gear is the fan gear after the gas water heater executes the air adding process according to the corresponding relationship of the blocked air adding interval and the second real-time fan gear is increased by at least one gear.

[0062] S504, control the gas water heater to execute the air addition exit process, so that the gas water heater exits the process of upgrading the second real-time fan gear according to the correspondence between the blocked air addition intervals, and switches the fan gear of the fan from the first real-time fan gear to the second real-time fan gear.

[0063] S505. If it is determined based on the current change that the load change of the gas water heater is too large and the speed offset exceeds the preset speed threshold, then the second real-time fan gear corresponding to the changed current is obtained. The second real-time fan gear is the fan gear after the gas water heater executes the air adding process according to the corresponding relationship of the blocked air adding interval and the first real-time fan gear is increased by at least one gear.

[0064] S506, control the gas water heater to execute the air addition exit process, so that the gas water heater exits the process of upgrading the first real-time fan gear according to the correspondence relationship of the blocked air addition interval, and switches the fan gear of the fan from the second real-time fan gear to the first real-time fan gear.

[0065] S507: If it is determined based on the current change that the load change of the gas water heater is not too large, but the speed offset exceeds the preset speed threshold, the gas water heater is controlled to execute the air-adding process according to the corresponding relationship of the blocked air-adding interval.

[0066] In this step, the load change of the gas water heater is judged to be too large according to the current change, and the judgment is made in the following manner: if the current change exceeds the preset current change threshold, it can be judged that the load change of the gas water heater is too large; if the current change does not exceed the preset current change threshold, it can be judged that the load change of the gas water heater is not too large. The gas water heater is controlled to execute the air-adding process according to the corresponding relationship of the blocked air-adding interval to ensure that even when the combustion chamber or flue is partially blocked, the water heater can improve the combustion efficiency and safety by increasing the fan speed.

[0067] S508. After executing the air-adding process, if the real-time fan speed of the fan continues to rise and reaches the maximum fan speed corresponding to the fan gear after air-adding, it is determined that the gas water heater has a fault and enters the fault handling process.

[0068] In a specific embodiment of the present application, when the real-time fan speed of the gas water heater continues to rise and reaches the maximum fan speed after the air is added, this usually means that there may be some kind of fault in the system. In this case, it is very necessary to enter the fault handling process. The fault handling process can ensure that when a problem occurs, the gas water heater can automatically enter the safety mode to avoid potential safety hazards, such as gas leakage, fire, etc.

[0069] S509: If it is determined based on the current change that the load change of the gas water heater is not too large, and the speed offset does not exceed the preset speed threshold, the gas water heater is controlled to execute a normal process according to the corresponding relationship of the normal operating range.

[0070] In a specific embodiment of the present application, if the load change of the gas water heater is not too large and the speed offset does not exceed the preset speed threshold, the gas water heater can be controlled to execute the normal process according to the correspondence of the normal operating range; or, if the speed offset does not exceed the preset speed threshold, the gas water heater can be controlled to execute the normal process according to the correspondence of the normal operating range, which can ensure that the gas water heater can operate efficiently and safely under normal working conditions.

[0071] The control method of the gas water heater proposed in the embodiment of the present application, if it is determined based on the current change that the load change of the gas water heater is not too large, but the speed offset exceeds the preset speed threshold, then the gas water heater is controlled to execute the air-adding process according to the corresponding relationship of the blocked air-adding interval; after executing the air-adding process, if the real-time fan speed of the fan continues to rise and reaches the maximum fan speed corresponding to the fan gear after air-adding, it is determined that the gas water heater has a fault and enters the fault handling process. Compared with the background technology, it has the beneficial effect of entering the fault handling process, which can effectively deal with the problem of abnormal increase in fan speed in the gas water heater and ensure the safe operation of the gas water heater. By timely detecting and handling faults, the stable operation of the gas water heater can be ensured to avoid frequent shutdowns or performance degradation caused by faults.

[0072] Embodiment 4

[0073] Figure 6 A schematic diagram of the structure of a gas water heater provided in one embodiment of the present application. The device is suitable for executing the control method of the gas water heater provided in this embodiment. A load configuration table is provided in the gas water heater, and the load configuration table includes a set of correspondences between proportional valve current, fan speed and fan gear position, and the correspondence set is divided into at least: a normal operating interval and a blocked air-adding interval; the same fan gear corresponds to a first fan speed range and a second fan speed range in the normal operating interval and the blocked air-adding interval, respectively; the maximum fan speed in the first fan speed range is less than or equal to the minimum fan speed in the second fan speed range. Figure 6 As shown, the gas water heater further includes: a first acquisition module 601, a rotation speed offset determination module 602, a second acquisition module 603, and a control execution module 604; wherein,

[0074] The first acquisition module 601 is used to acquire the current change amount and the first real-time fan gear corresponding to the current before the change when the current of the proportional valve is monitored to change within a unit time during the operation of the gas water heater according to the load configuration table;

[0075] The speed offset determination module 602 is used to obtain the real-time fan speed of the fan and determine the speed offset between the real-time fan speed and the fan speed corresponding to the changed current recorded in the load configuration table;

[0076] The second acquisition module 603 is used to obtain a second real-time fan gear corresponding to the changed current if it is determined that the load change of the gas water heater is too large according to the current change, and the speed offset exceeds a preset speed threshold, wherein the first real-time fan gear is the fan gear after the gas water heater executes the air-adding process according to the corresponding relationship of the blocked air-adding interval and the second real-time fan gear is increased by at least one gear;

[0077] The control execution module 604 is used to control the gas water heater to execute the air supply exit process, so that the gas water heater exits the process of upgrading the second real-time fan gear according to the corresponding relationship of the blocked air supply interval, and switches the fan gear of the fan from the first real-time fan gear to the second real-time fan gear;

[0078] The second acquisition module 603 is further used for acquiring a second real-time fan gear corresponding to the changed current if it is determined that the load change of the gas water heater is too large according to the current change, and the speed offset exceeds a preset speed threshold, wherein the second real-time fan gear is the fan gear after the gas water heater executes the air-adding process according to the corresponding relationship of the blocked air-adding interval and the first real-time fan gear is increased by at least one gear;

[0079] The control execution module 604 is also used to control the gas water heater to execute the air addition exit process, so that the gas water heater exits the process of upgrading the first real-time fan gear according to the correspondence between the blocked air addition intervals, and switches the fan gear of the fan from the second real-time fan gear to the first real-time fan gear.

[0080] The above-mentioned gas water heater can execute the method provided by any embodiment of the present application, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the control method of the gas water heater provided by any embodiment of the present application.

[0081] Embodiment 5

[0082] Figure 7 A schematic structural diagram of a gas water heater provided in another embodiment of the present application. Figure 7 A block diagram of an exemplary gas water heater suitable for implementing embodiments of the present application is shown. Figure 7 The gas water heater 12 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0083] like Figure 7As shown, the components of the gas water heater 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 connecting various system components (including the system memory 28 and the processing unit 16).

[0084] Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. By way of example, these architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0085] The gas water heater 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the gas water heater 12, including volatile and non-volatile media, removable and non-removable media.

[0086] The system memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. The gas water heater 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 34 may be used to read and write non-removable, non-volatile magnetic media ( Figure 7 not shown, usually called a "hard drive"). Although Figure 7 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical medium) may be provided. In these cases, each drive may be connected to the bus 18 via one or more data medium interfaces. The memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present application.

[0087] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in the memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules 42 generally perform the functions of the embodiments described herein.

[0088] The gas water heater 12 may also communicate with one or more external devices 14 (e.g., keyboards, pointing devices, displays 24, etc.), one or more devices that enable a user to interact with the gas water heater 12, and / or any device that enables the gas water heater 12 to communicate with one or more other computing devices (e.g., network cards, modems, etc.). Such communication may be performed through an input / output (I / O) interface 22. Furthermore, the gas water heater 12 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter 20. As shown, the network adapter 20 communicates with other modules of the gas water heater 12 through a bus 18. It should be understood that although Figure 7 Not shown, other hardware and / or software modules may be used in conjunction with the gas water heater 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0089] The processing unit 16 executes various functional applications and data processing by running the programs stored in the system memory 28, such as implementing the control method of the gas water heater provided in the embodiment of the present application.

[0090] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] The specific contents of the above specific embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A control method for a gas water heater, Features: The gas water heater is provided with a load configuration table, the load configuration table includes a set of correspondences among proportional valve current, fan speed and fan gear position, the set of correspondences is at least divided into: a normal operating interval and a blocked air supply interval; the same fan gear position corresponds to a first fan speed range and a second fan speed range in the normal operating interval and the blocked air supply interval respectively; the maximum fan speed in the first fan speed range is less than or equal to the minimum fan speed in the second fan speed range; The method comprises: During the operation of the gas water heater according to the load configuration table, when it is monitored that the current of the proportional valve changes within a unit time, the current change amount and the first real-time fan gear corresponding to the current before the change are obtained; Obtaining a real-time fan speed of the fan, and determining a speed offset between the real-time fan speed and the fan speed corresponding to the changed current recorded in the load configuration table; If it is determined that the load change of the gas water heater is too large according to the current change, and the speed offset exceeds the preset speed threshold, then the second real-time fan gear corresponding to the changed current is obtained, and the first real-time fan gear is the fan gear after the gas water heater executes the air-adding process according to the corresponding relationship of the blocked air-adding interval and the second real-time fan gear is increased by at least one gear; the gas water heater is controlled to execute the air-adding exit process, so that the gas water heater exits the process of increasing the gear of the second real-time fan gear according to the corresponding relationship of the blocked air-adding interval, and the fan gear of the fan is switched from the first real-time fan gear to the second real-time fan gear; Alternatively, if it is determined based on the current change that the load change of the gas water heater is too large, and the speed offset exceeds the preset speed threshold, then the second real-time fan gear corresponding to the changed current is obtained, and the second real-time fan gear is the fan gear after the gas water heater executes the air adding process according to the correspondence between the blocked air adding interval and the first real-time fan gear is increased by at least one gear; the gas water heater is controlled to execute the air adding exit process, so that the gas water heater exits the process of increasing the gear of the first real-time fan gear according to the correspondence between the blocked air adding interval, and the fan gear of the fan is switched from the second real-time fan gear to the first real-time fan gear.

2. The method according to claim 1, Features: After the fan gear of the fan is switched from the first real-time fan gear to the second real-time fan gear, or after the fan gear of the fan is switched from the second real-time fan gear to the first real-time fan gear, the method further includes: After controlling the gas water heater to run for a set time, continue to monitor the current of the proportional valve; If the current changes within the unit time, and when it is determined that the load change of the gas water heater is still too large based on the current change amount corresponding to the change, the air addition exit process continues to be executed.

3. The method according to claim 2, Features: The method further comprises: If the current does not change within the unit time, or if the current changes within the unit time but it is determined that the load change of the gas water heater is not too large based on the current change amount corresponding to the change, the gas water heater is controlled to execute the air adding process according to the corresponding relationship of the blocked air adding interval.

4. The method according to claim 1, Features: The method further comprises: If the speed offset does not exceed the preset speed threshold, the gas water heater is controlled to execute a normal process according to the corresponding relationship of the normal operating range.

5. The method according to claim 1, Features: The method further comprises: If it is determined according to the current change that the load change of the gas water heater is not too large, but the speed offset exceeds the preset speed threshold, the gas water heater is controlled to execute the air-adding process according to the corresponding relationship of the blocked air-adding interval; If it is determined according to the current variation that the load variation of the gas water heater is not too large, and the speed offset does not exceed the preset speed threshold, the gas water heater is controlled to execute a normal process according to the corresponding relationship of the normal operating range.

6. The method according to claim 3 or 5, Features: The method further comprises: After executing the air-adding process, if the real-time fan speed of the fan continues to rise and reaches the maximum fan speed corresponding to the fan gear after air-adding, it is determined that the gas water heater has a fault and enters the fault handling process.

7. The method according to any one of claims 1 to 5, Features: The excessive load change of the gas water heater is determined according to the current change, and the determination is made in the following manner: If the current change exceeds a preset current change threshold, it is determined that the load change of the gas water heater is too large; If the current change does not exceed the preset current change threshold, it is determined that the load change of the gas water heater is not too large.

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