CN110332717B - Combustion control method and device for water heater, water heater and storage medium - Google Patents
Combustion control method and device for water heater, water heater and storage medium Download PDFInfo
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- CN110332717B CN110332717B CN201910655758.1A CN201910655758A CN110332717B CN 110332717 B CN110332717 B CN 110332717B CN 201910655758 A CN201910655758 A CN 201910655758A CN 110332717 B CN110332717 B CN 110332717B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
Abstract
The invention discloses a combustion control method and device of a water heater, the water heater and a storage medium, wherein the combustion control method of the water heater comprises the steps of obtaining set combustion power, calculating driving current of a proportional valve by utilizing a preset quadratic polynomial function relation of current and power according to the set combustion power, calculating duty ratio of a driving PWM signal according to the driving current, and driving the proportional valve by utilizing the duty ratio of the driving PWM signal to carry out combustion. According to the combustion power setting method, the driving current of the proportional valve is calculated by utilizing the quadratic polynomial function relation of the preset current and the preset power according to the set combustion power, so that the set combustion power is closer to the actually measured combustion power.
Description
Technical Field
The invention relates to the technical field of intelligent household appliances, in particular to a combustion control method and device of a water heater, the water heater and a storage medium.
Background
With the continuous development of intelligent household appliance technology, intelligent gas water heaters flow into homes of common people in large quantities. The intelligent gas water heater can adopt a temperature mode and a power mode, wherein the temperature mode refers to the gas water heater heating according to the temperature set by the user, and the power mode refers to the gas water heater heating according to the combustion power set by the user. At the present stage, in a temperature mode, the gas water heater can flexibly deal with the change of water flow and keep the water temperature constant; in the power mode, according to the existing control mode, the combustion power set by a user has a defect of large difference with the actually measured combustion power.
Disclosure of Invention
In view of this, embodiments of the present invention provide a combustion control method and apparatus for a water heater, and a storage medium, so as to solve the problem that a difference between a combustion power set by a user and an actually measured combustion power is large.
According to a first aspect, an embodiment of the present invention provides a combustion control method for a water heater, including the following steps:
acquiring set combustion power;
calculating the driving current of the proportional valve according to the combustion power by utilizing a preset quadratic polynomial function relation between the current and the combustion power;
calculating the duty ratio of a driving PWM signal according to the driving current;
and driving the proportional valve by utilizing the duty ratio of the driving PWM signal to perform combustion.
The combustion control method of the water heater comprises the steps of obtaining set combustion power, calculating driving current of a proportional valve according to the set combustion power by utilizing a quadratic polynomial function relation of preset current and the combustion power, calculating duty ratio of a driving PWM signal according to the driving current, and driving the proportional valve by utilizing the duty ratio of the driving PWM signal to perform combustion. According to the embodiment of the invention, the driving current of the proportional valve is calculated by utilizing the quadratic polynomial function relation of the preset current and the preset power according to the set combustion power, so that the set combustion power is closer to the actually measured combustion power, and the heating by adopting a power mode is more accurate.
With reference to the first aspect, in a first embodiment of the first aspect, the second-order polynomial function relationship between current and power is:
I＝a1P2+a2P+a3
wherein I represents current, P represents power, a1、a2、a3Is a constant coefficient.
With reference to the first aspect and the first embodiment of the first aspect, in a second embodiment of the first aspect, the duty ratio of the driving PWM signal is obtained by:
D＝mI+n
wherein D represents the duty ratio of the driving PWM signal, I represents the driving current, and m and n are constant coefficients.
With reference to the first aspect, in a third embodiment of the first aspect, the set combustion power is obtained after the temperature mode of the water heater fails.
With reference to the first aspect or the third embodiment of the first aspect, in the fourth embodiment of the first aspect, after the set combustion power is obtained, the method further includes: and determining the opening and closing states of the sectional valves matched with the combustion power.
According to a second aspect, an embodiment of the present invention provides a combustion control apparatus for a water heater, including:
the acquisition module is used for acquiring set combustion power;
the processing module is used for calculating the driving current of the proportional valve according to the combustion power by utilizing a preset quadratic polynomial function relation between the current and the combustion power and calculating the duty ratio of the driving PWM signal according to the driving current;
and the driving module is used for driving the proportional valve by utilizing the duty ratio of the driving PWM signal to perform combustion.
With reference to the second aspect, in a first embodiment of the second aspect, the second-order polynomial function relationship between current and power is:
I＝a1P2+a2P+a3
wherein I represents current, P represents power, a1、a2、a3Is a constant coefficient.
With reference to the second aspect, in a second embodiment of the second aspect, the obtaining module is configured to obtain the set combustion power after the temperature mode of the water heater fails.
With reference to the second aspect and the second embodiment of the second aspect, in a third embodiment of the second aspect, the processing module is further configured to determine, after acquiring the set combustion power, an opening and closing state of each segment valve that matches the combustion power.
According to a third aspect, an embodiment of the present invention provides a water heater, including: the combustion control method comprises a power collector, a memory and a processor, wherein the power collector, the memory and the processor are connected in a communication manner, the memory stores computer instructions, and the processor executes the computer instructions so as to execute the combustion control method of the first aspect or any embodiment of the first aspect.
According to a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores computer instructions for causing a computer to execute the combustion control method according to the first aspect or any of the embodiments of the first aspect.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a schematic flow chart showing a combustion control method for a water heater according to embodiment 1 of the present invention;
FIG. 2 is a schematic flow chart illustrating a combustion control method for a water heater according to embodiment 2 of the present invention;
FIG. 3 is a schematic structural view of a combustion control device for a water heater according to embodiment 3 of the present invention;
FIG. 4 is a schematic diagram of a human-computer interface in embodiment 3 of the present invention;
fig. 5 is a schematic structural view of a water heater according to embodiment 4 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment 1 of the invention provides a combustion control method of a water heater, which is applied to a gas water heater. Fig. 1 is a schematic flow chart of a water heater combustion control method according to embodiment 1 of the present invention, and as shown in fig. 1, the water heater combustion control method according to embodiment 1 of the present invention includes the following steps:
s101: and acquiring the set combustion power.
As a specific implementation mode, a human-computer interaction interface can be arranged on the gas water heater, so that a user can set the combustion power. For example, a preset combustion power may be displayed on the human-computer interaction interface, the user may adjust the combustion power as needed, and after receiving an instruction of the user to confirm the combustion power or confirm the adjusted combustion power, the combustion power value set by the user is obtained. Specifically, the instruction for confirming the combustion power or confirming the adjusted combustion power by the user may be an instruction for inputting confirmation by the user, or an instruction for adjusting the combustion power by the user is not received within a preset time period.
S102: and calculating the driving current of the proportional valve according to the combustion power by utilizing a preset quadratic polynomial function relation between the current and the combustion power.
In embodiment 1 of the present invention, the proportional valve is a gas proportional valve, which is used for changing the air intake of the gas water heater.
As a specific embodiment, the second-order polynomial function relationship of current and power is:
I＝a1P2+a2P+a3
wherein I represents current, P represents power, a1、a2、a3Is a constant coefficient.
In the above table, the set power refers to the combustion power set by the user, and the measured power refers to the combustion power measured when heating is performed in accordance with the set combustion power. In the power mode, after a user sets power, the water heater needs to calculate the driving current of the proportional valve according to the power set by the user by using a preset functional relation between the current and the power, calculate the duty ratio of a driving PWM signal according to the driving current, and finally drive the proportional valve by using the duty ratio of the driving PWM signal to perform combustion. When different current and power functional relations are selected, the duty ratios of the obtained driving PWM signals are different, and further the actual power of the water heater is different. Table 1 shows the actual power of the water heater under two conditions of using a quadratic polynomial function relationship and a linear function relationship (prior art), and it can be seen from the data in the above table that, when the quadratic polynomial function relationship is used, the set power is closer to the measured power, and when the linear function is used, the difference between the set power and the measured power is larger, that is, the nonlinear mode is used to process the function relationship between the power and the current, so as to implement the power control with higher precision.
In embodiment 1 of the present invention, a plurality of sample data may be acquired, each sample data includes a known current value and a known combustion power, and a is obtained by analyzing the plurality of sample data1、a2、a3。
S103: and calculating the duty ratio of the driving PWM signal according to the driving current.
As a specific embodiment, the duty ratio of the driving PWM signal is obtained by the following formula: d is mI + n, where D denotes a duty ratio of the driving PWM signal, I denotes a driving current, and m and n are constant coefficients.
In embodiment 1 of the present invention, a plurality of sample data may be acquired, each sample data includes a known current value and a duty ratio of a driving PWM signal, and m and n are obtained by analyzing the plurality of sample data.
S104: and driving the proportional valve by utilizing the duty ratio of the driving PWM signal to perform combustion.
The combustion control method of the water heater provided by the embodiment 1 of the invention comprises the steps of obtaining set combustion power, calculating the driving current of the proportional valve according to the set combustion power by utilizing a quadratic polynomial function relation between preset current and the combustion power, calculating the duty ratio of a driving PWM signal according to the driving current, and driving the proportional valve by utilizing the duty ratio of the driving PWM signal to carry out combustion. According to the embodiment of the invention, the driving current of the proportional valve is calculated by utilizing the quadratic polynomial function relation of the preset current and the preset power according to the set combustion power, so that the set power is closer to the actually measured power, and the heating by adopting a power mode is more accurate.
Example 2
When the temperature mode is adopted, the intelligent gas water heater can provide hot water according to the temperature set by a user; the water flow change can be flexibly coped with, and the water temperature is kept constant; the faults existing in the unit can be found in time and fed back to the user. However, the higher the intelligence and the better the performance, the higher the degree of dependence on the reliability of the functional components. For example, when a core component water temperature sensor breaks down, the water temperature is often disordered, and even the unit is out of service. This creates an extremely harsh use experience in situations where the user is in urgent need of hot water. Therefore, when the water temperature sensor of the gas water heater breaks down, the user can switch to the power mode, and the gas water heater can burn according to the power set by the user, so that domestic hot water is continuously provided for the user.
The embodiment 2 of the invention provides a combustion control method of a water heater, which is applied to a gas water heater. Fig. 2 is a schematic flow chart of a water heater combustion control method according to embodiment 2 of the present invention, and as shown in fig. 2, the water heater combustion control method according to embodiment 2 of the present invention includes the following steps:
s201: and acquiring the set combustion power after the temperature mode of the water heater fails.
In embodiment 2 of the present invention, in the temperature mode, the water heater burns according to a preset temperature, and the water heater can provide hot water for a user according to the preset temperature, which is well known to those skilled in the art and will not be described herein again.
S202: and calculating the driving current of the proportional valve according to the combustion power by utilizing a preset quadratic polynomial function relation between the current and the combustion power.
Specifically, the second-order polynomial function relationship between the current and the power is as follows:
I＝a1P2+a2P+a3
wherein I represents current, P represents power, a1、a2、a3Is a constant coefficient.
S203: and calculating the duty ratio of the driving PWM signal according to the driving current.
Specifically, the duty ratio of the driving PWM signal is obtained by the following formula: d is mI + n, where D denotes a duty ratio of the driving PWM signal, I denotes a driving current, and m and n are constant coefficients.
S204: and determining the opening and closing states of the sectional valves matched with the combustion power.
In embodiment 2 of the invention, the firepower of the gas water heater can be changed by using the sectional valve.
As a specific embodiment, the following technical solutions may be adopted to determine the switching states of the segment valves matching with the combustion power: matching the combustion power with a preset power range, and determining the power range to which the combustion power belongs; and searching in the corresponding relation between the preset power range and the switching state of each sectional valve by using the determined power range to obtain the switching state of each sectional valve corresponding to the power range.
Illustratively, the obtained combustion power is P, in the power rising section, when P belongs to a first power range (P0KW is not less than P < P1KW), the first power range is used for searching in the corresponding relation between the preset power range and the switching state of each segment valve, the switching state of each segment valve corresponding to the first power range is obtained, that is, the gas segment valves 1 and 2 are closed, and at this time, two-spark combustion is adopted. When P belongs to a second power range (P is not less than P1KW and is less than P < P2KW), searching in the corresponding relation between the preset power range and the switching state of each sectional valve by using the second power range to obtain the switching state of each sectional valve corresponding to the second power range, namely opening the gas sectional valve 1, closing the gas sectional valve 2, and adopting four-row fire combustion at the moment. When P belongs to a third power range (P is more than or equal to P2KW and less than or equal to P3KW), searching in the corresponding relation between the preset power range and the switching state of each sectional valve by using the third power range to obtain the switching state of each sectional valve corresponding to the third power range, namely opening the gas sectional valves 1 and 2, and adopting six-row fire combustion at the moment.
In the power reduction stage, when P belongs to a fourth power range (P3KW is more than or equal to P > P2' KW), the fourth power range is used for searching in the corresponding relation between the preset power range and the switching state of each sectional valve, the switching state of each sectional valve corresponding to the fourth power range is obtained, namely the gas sectional valves 1 and 2 are opened, and at the moment, six-row-of-fire combustion is adopted. When P belongs to a fifth power range (P2 'KW is more than or equal to P1' KW), the fifth power range is used for searching in the corresponding relation between the preset power range and the switching state of each sectional valve, the switching state of each sectional valve corresponding to the fifth power range is obtained, namely the gas sectional valve 1 is opened, the gas sectional valve 2 is closed, and four-row-of-fire combustion is adopted at the moment. When P belongs to a sixth power range (P1' KW is more than or equal to P0KW), the sixth power range is used for searching in the corresponding relation between the preset power range and the switching state of each sectional valve, the switching state of each sectional valve corresponding to the sixth power range is obtained, namely the gas sectional valves 1 and 2 are closed, and at the moment, two-fire-discharge combustion is adopted. Wherein p0, p1, p2, p3, p2 'and p 1' are power point constants.
S205: and controlling the water heater to burn according to the duty ratio of the driving PWM signal and the switching state of each sectional valve.
In the embodiment 2 of the invention, under the condition that key system components such as a water temperature sensor, a wind pressure switch, a fan and the like are failed and fail, the water can still be combusted according to the power set by a user, domestic hot water is provided, the reliability of the intelligent gas water heater is enhanced, and the flexibility of coping with emergency situations is improved. A more humanized and easy-to-operate power mode operation mode is provided, and a user can decide whether to start the power mode according to needs. Meanwhile, in the embodiment 2 of the invention, the driving current of the proportional valve is calculated by utilizing the quadratic polynomial function relation between the preset current and the combustion power according to the set combustion power, so that the set power is closer to the actually measured power, and the heating by adopting a power mode is more accurate.
Example 3
Embodiment 3 of the invention provides a combustion control device of a water heater. Fig. 3 is a schematic structural diagram of a water heater combustion control device in embodiment 3 of the present invention, and as shown in fig. 3, the water heater combustion control device in embodiment 3 of the present invention includes an obtaining module 30, a processing module 32, and a driving module 34.
Specifically, the obtaining module 30 is configured to obtain the set combustion power.
The obtaining module 30 provides a human-computer interaction interface, which is shown in fig. 4, and fig. 4 includes 1 double 8 nixie tubes; the 4 keys are respectively a [ power mode ] key, a [ plus ] key and an on-off key. Under the interface, a user can set the combustion power of the gas water heater through preset operation steps. For example, the following steps may be taken to set the combustion power: (1) powering off and then powering on the unit, starting up the unit by pressing a [ switch ] key for a short time, starting up the unit within 10 seconds and pressing a [ power mode ] key for a long time for 5 seconds, and entering a power mode; (2) at the moment, the number displayed by the double 8 nixie tubes is the set value of the combustion power of the gas water heater, for example, 24 represents the combustion power of 24 KW; (3) the combustion power can be adjusted through the [ phi ] and [ phi ] keys, when the power data value is adjusted, the power data is displayed in a flickering mode, and the flickering frequency is 1 Hz; (4) after the combustion power of the unit is adjusted, a [ switch ] key is pressed for confirmation, the set combustion power takes effect, the power value stops flashing, and the power value is displayed in a normally bright mode. In addition, in the power mode, the [ power mode ] key is pressed for 5 seconds, and the power mode can be exited.
The processing module 32 is configured to calculate a driving current of the proportional valve according to the combustion power by using a preset quadratic polynomial function relationship between current and power; and calculating the duty ratio of the driving PWM signal according to the driving current. Wherein, the quadratic polynomial function relationship of the current and the power is as follows: a is1P2+a2P+a3Wherein I represents current, P represents power, a1、a2、a3Is a constant coefficient. The duty ratio of the driving PWM signal is obtained by the following formula: d is mI + n, where D denotes a duty ratio of the driving PWM signal, I denotes a driving current, and m and n are constant coefficients.
And the driving module 34 is used for driving the proportional valve by utilizing the duty ratio of the driving PWM signal to perform combustion. In embodiment 3 of the present invention, the driving module may drive the safety valve in addition to the proportional valve and the segment valve, and the driving module may drive the safety valve by using a conventional technical means in the art, which is not described in detail herein.
Further, in the combustion control device of a water heater according to embodiment 3 of the present invention, the driving module 34 is further configured to determine the on-off state of each segment valve matching the combustion power after the set combustion power is obtained.
Example 4
An embodiment of the present invention further provides a water heater, as shown in fig. 5, the water heater may include a power harvester 50, a processor 51 and a memory 52, where the processor 51 and the memory 52 may be connected by a bus or in another manner, and fig. 5 takes the connection by the bus as an example.
The processor 51 may be a Central Processing Unit (CPU). The Processor 51 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 52, as a non-transitory computer readable storage medium, may be used for storing non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules (e.g., the acquisition module 30, the first processing module 32, the second processing module 34, and the driving module 36 shown in fig. 2) corresponding to the combustion control method of the water heater in the embodiment of the present invention. The processor 51 executes various functional applications and data processing of the processor by running non-transitory software programs, instructions and modules stored in the memory 52, that is, implements the combustion control method in the above-described method embodiments.
The memory 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 51, and the like. Further, the memory 52 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 52 may optionally include memory located remotely from the processor 51, and these remote memories may be connected to the processor 51 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 52 and, when executed by the processor 51, perform a combustion control method as in the embodiment shown in fig. 1-2.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (9)
1. A combustion control method for a water heater, comprising:
acquiring set combustion power;
calculating the driving current of the proportional valve according to the combustion power by utilizing a preset quadratic polynomial function relation between the current and the combustion power;
calculating the duty ratio of a driving PWM signal according to the driving current;
driving the proportional valve by utilizing the duty ratio of the driving PWM signal to perform combustion; the quadratic polynomial function relationship of the current and the power is as follows:
I＝a1P2+a2P+a3
wherein I represents current, P represents power, a1、a2、a3Is a constant coefficient.
2. The combustion control method of a water heater according to claim 1, wherein the duty ratio of the driving PWM signal is obtained by:
D＝mI+n
wherein D represents the duty ratio of the driving PWM signal, I represents the driving current, and m and n are constant coefficients.
3. The combustion control method of a water heater according to claim 1, characterized in that:
and acquiring the set combustion power after the temperature mode of the water heater fails.
4. The combustion control method of a water heater according to claim 1 or 3, further comprising, after obtaining the set combustion power:
and determining the opening and closing states of the sectional valves matched with the combustion power.
5. A combustion control device of a water heater is characterized by comprising
The acquisition module is used for acquiring set combustion power;
the processing module is used for calculating the driving current of the proportional valve according to the combustion power by utilizing a preset quadratic polynomial function relation between the current and the combustion power and calculating the duty ratio of the driving PWM signal according to the driving current;
the driving module is used for driving the proportional valve by utilizing the duty ratio of the driving PWM signal to perform combustion;
the quadratic polynomial function relationship of the current and the power is as follows:
I＝a1P2+a2P+a3
wherein I represents current, P represents power, a1、a2、a3Is a constant coefficient.
6. The combustion control apparatus of a water heater according to claim 5, wherein: the acquisition module is used for acquiring set combustion power after the temperature mode of the water heater fails.
7. The combustion control device of the water heater as claimed in claim 5 or 6, wherein the processing module is further configured to determine the on-off state of each segment valve matching the combustion power after acquiring the set combustion power.
8. A water heater, comprising:
the combustion control system comprises a power collector, a memory and a processor, wherein the power collector, the memory and the processor are connected in a communication mode, computer instructions are stored in the memory, and the processor executes the computer instructions so as to execute the combustion control method of any one of claims 1 to 4.
9. A computer-readable storage medium storing computer instructions for causing a computer to execute the combustion control method according to any one of claims 1 to 4.
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| CN114183769B (en) * | 2021-12-16 | 2022-11-08 | 珠海格力电器股份有限公司 | Control method and control device for gas proportional valve |
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| CN2658641Y (en) * | 2003-10-15 | 2004-11-24 | 中山华帝燃具股份有限公司 | Gas water heater capable of sectional burning |
| CN102080878B (en) * | 2009-11-27 | 2013-05-08 | 海尔集团公司 | Draught fan control method and device of gas equipment |
| CN202057059U (en) * | 2010-12-17 | 2011-11-30 | 深圳市世惠之家电器有限公司 | Changeover switch for adjusting power of electric water heater |
| CN203595284U (en) * | 2013-11-05 | 2014-05-14 | 高竹梅 | Water heater |
| CN105351596A (en) * | 2015-12-07 | 2016-02-24 | 沈阳工业大学 | Compound control method for proportional electromagnetic valve |
| CN105485925A (en) * | 2015-12-30 | 2016-04-13 | 广东万家乐燃气具有限公司 | Variable-litre gas water heater |
| JP6326446B2 (en) * | 2016-04-28 | 2018-05-16 | ダイキン工業株式会社 | Hot water supply system and power limiting system provided with the same |
| CN108006980B (en) * | 2016-11-11 | 2020-09-29 | 芜湖美的厨卫电器制造有限公司 | Gas water heater and constant temperature control method and device thereof |
| CN107339809B (en) * | 2017-01-24 | 2019-09-20 | 宁波方太厨具有限公司 | A kind of method for controlling combustion of gas heater |
| CN107339811B (en) * | 2017-01-24 | 2019-07-26 | 宁波方太厨具有限公司 | A method of detection gas heater burning gases whether standard |
| CN107339810B (en) * | 2017-01-24 | 2019-09-20 | 宁波方太厨具有限公司 | A kind of method for controlling combustion of the gas heater based on DC fan |
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