Control method of gas water heater, gas water heater and storage medium

Abstract

The invention discloses a control method of a gas water heater, the gas water heater and a storage medium. The gas system of the gas water heater is provided with an ultrasonic detection module, and the method comprises the following steps: acquiring gas detection data detected by the ultrasonic detection module; determining a gas heat value according to the gas detection data; and the gas water heater is controlled to operate according to the gas heat value, so that the air-fuel ratio of the gas water heater reaches a set proportion. The invention aims to improve the combustion quality of the gas water heater.

Description

Technical Field

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

[0002] Gas water heaters heat water by burning gas to release heat, and the air-fuel ratio in this process is an important factor affecting the combustion quality. The calorific value of the gas is generally measured under standard working conditions before the water heater leaves the factory, and the air-fuel related control parameters of the water heater are determined based on the measured calorific value. During the actual use of the water heater after leaving the factory, the air-fuel ratio of the water heater will be controlled according to the fixed control parameters measured before leaving the factory.

[0003] However, the calorific value of the gas used in gas water heaters is different due to the different composition of the gas. This will result in the air-fuel ratio of the water heater failing to reach the air-fuel ratio required for good combustion when the water heater operates according to the pre-calibrated air-fuel ratio control parameters. Problems such as resonance, unstable flame, failure to ignite, and excessive smoke will occur, resulting in poor combustion quality. Summary of the invention

[0004] The main purpose of the present invention is to provide a control method for a gas water heater, a gas water heater and a storage medium, aiming to improve the combustion quality of the gas water heater.

[0005] To achieve the above object, the present invention provides a control method for a gas water heater, wherein a gas system of the gas water heater is provided with an ultrasonic detection module, and the control method for the gas water heater comprises the following steps:

[0006] Acquiring gas detection data detected by the ultrasonic detection module;

[0007] Determining the calorific value of the gas according to the gas detection data;

[0008] The gas water heater is controlled to operate according to the gas calorific value so that the air-fuel ratio of the gas water heater reaches a set ratio.

[0009] Optionally, the gas detection data includes gas density and / or ultrasonic transmission characteristic parameters, and the step of determining the gas calorific value according to the gas detection data includes:

[0010] The calorific value of the gas is determined according to the gas density and / or the ultrasonic transmission characteristic parameter.

[0011] Optionally, the step of determining the calorific value of the gas according to the gas density and / or the ultrasonic transmission characteristic parameter comprises:

[0012] Obtaining the start-up time of the gas water heater and the rotation speed of the fan in the gas water heater;

[0013] Acquire a target corresponding relationship between the gas density and / or the ultrasonic transmission characteristic parameter and the gas calorific value according to the opening time and the rotation speed;

[0014] The gas density and / or the gas calorific value corresponding to the ultrasonic transmission characteristic parameter is determined according to the target corresponding relationship.

[0015] Optionally, the step of controlling the operation of the gas water heater according to the calorific value of the gas so that the air-fuel ratio of the gas water heater reaches a set ratio includes:

[0016] controlling the opening of the gas proportional valve of the gas water heater according to the gas calorific value so that the air-fuel ratio of the gas water heater reaches the set ratio; and / or,

[0017] The rotation speed of the fan of the gas water heater is controlled according to the calorific value of the gas so that the air-fuel ratio of the gas water heater reaches the set ratio.

[0018] Optionally, the step of controlling the speed of the fan of the gas water heater according to the calorific value of the gas so that the air-fuel ratio of the gas water heater reaches a set ratio includes:

[0019] When the calorific value of the gas is greater than the standard calorific value of the gas water heater, controlling the fan to increase the rotation speed;

[0020] When the calorific value of the gas is less than the standard calorific value, the fan is controlled to reduce its rotation speed.

[0021] Optionally, the step of controlling the opening of the gas proportional valve of the gas water heater according to the gas calorific value so that the air-fuel ratio of the gas water heater reaches a set ratio includes:

[0022] When the calorific value of the gas is greater than the standard calorific value of the gas water heater, controlling the gas proportional valve to reduce its opening;

[0023] When the gas calorific value is less than the standard calorific value, the gas proportional valve is controlled to increase its opening.

[0024] Optionally, the process for determining the target opening adjustment value when controlling the gas proportional valve to reduce or increase the opening is as follows:

[0025] Obtaining a current first outlet water temperature of the gas water heater;

[0026] The target opening adjustment value is determined according to the first outlet water temperature and the gas calorific value.

[0027] Optionally, the step of determining the target opening adjustment value according to the first outlet water temperature and the gas calorific value includes:

[0028] Determine the temperature difference between the first outlet water temperature and the set outlet water temperature, and determine the difference between the gas calorific value and the standard calorific value;

[0029] Determine a reference opening adjustment value according to the temperature difference value;

[0030] The reference opening adjustment value is corrected according to the difference to obtain the target opening adjustment value.

[0031] Optionally, before the step of controlling the opening of the gas proportional valve of the gas water heater according to the calorific value of the gas so that the air-fuel ratio of the gas water heater reaches a set ratio, the step further includes:

[0032] Obtaining a second outlet water temperature of the gas water heater;

[0033] determining a reference opening of the gas proportional valve according to the second outlet water temperature;

[0034] The gas proportional valve is controlled to operate at the reference opening for a preset time period.

[0035] Optionally, after the step of acquiring the gas detection data detected by the ultrasonic detection module, the step further includes:

[0036] Determining the type of gas introduced into the gas system according to the gas detection data;

[0037] When the gas type matches the preset type corresponding to the gas water heater, the gas water heater is controlled to start combustion to execute the step of determining the calorific value of the gas according to the gas detection data.

[0038] Optionally, after the step of determining the type of gas introduced into the gas system according to the gas detection data, the step further includes:

[0039] When the gas type does not match the preset type, the gas water heater is controlled to prohibit combustion and output an alarm prompt message.

[0040] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a gas water heater, which comprises:

[0041] case;

[0042] A combustion system, disposed in the housing;

[0043] an air system, disposed in the housing, the air system providing air to the combustion system;

[0044] a gas system, at least partially disposed in the shell, the gas system providing gas to the combustion system, the gas system being provided with a gas proportional valve disposed in the shell;

[0045] An ultrasonic detection module, provided in the gas system, for detecting the amount of gas flowing through the gas system;

[0046] a water system, at least partly disposed in the shell, the combustion system being used to heat water flowing through the water system, the water system comprising a water tank, a water inlet pipe and a water outlet pipe, the water outlet end of the water inlet pipe and the water inlet end of the water outlet pipe being connected to the water tank, the combustion system being located below the water tank, and the air system, the gas system and the ultrasonic detection module being located below the combustion system;

[0047] A control device, the ultrasonic detection module is connected to the control device, the control device comprises: a memory, a processor and a control program for the gas water heater stored in the memory and executable on the processor, the control program for the gas water heater, when executed by the processor, implements the steps of the control method for the gas water heater as described in any one of the above items.

[0048] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a control program of a gas water heater is stored. When the control program of the gas water heater is executed by a processor, the steps of the control method of the gas water heater as described in any of the above items are implemented.

[0049] The present invention proposes a control method for a gas water heater. The method sets an ultrasonic detection module in the gas system of the gas water heater, determines the calorific value of the gas during actual use of the water heater based on the gas detection data detected by the ultrasonic detection module, and controls the operation of the gas water heater according to the calorific value of the gas so that its actual air-fuel ratio can reach a set ratio. The change of the gas composition in the gas system can be accurately measured by the ultrasonic detection module, ensuring that even if the actual calorific value of the gas is different from the calibrated calorific value during actual use of the water heater, the air-fuel ratio of the water heater can reach the set ratio required for good combustion, thereby avoiding the occurrence of unstable combustion, excessive smoke, failure to ignite, resonance and the like, thereby effectively improving the combustion quality of the gas water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of an embodiment of a gas water heater of the present invention;

[0051] Figure 2 A schematic diagram of the hardware structure involved in the operation of a gas water heater according to an embodiment of the present invention;

[0052] Figure 3A schematic diagram of a flow chart of an embodiment of a control method for a gas water heater of the present invention;

[0053] Figure 4 A schematic flow chart of another embodiment of a method for controlling a gas water heater according to the present invention;

[0054] Figure 5 This is a flow chart of another embodiment of the control method of the gas water heater of the present invention.

[0055] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0056] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0057] The embodiment of the present invention provides a gas water heater 100 .

[0058] In the embodiment of the present invention, refer to Figure 1 and Figure 2 The gas water heater 100 includes a gas system 40 and a control device. The gas system 40 is provided with an ultrasonic detection module 50 . Both the gas system 40 and the ultrasonic detection module 50 are connected to the control device 70 .

[0059] The ultrasonic detection module 50 is disposed in the gas system 40 and is used to detect gas detection data of the inflowing gas.

[0060] Reference Figure 1 The gas water heater 100 includes a housing 10, a combustion system 20, an air system 30, a gas system 40, an ultrasonic detection module 50, and a water system 60; the combustion system 20 is arranged in the housing 10; the air system 30 is arranged in the housing 10, and the air system 30 provides air to the combustion system 20; the gas system 40 is at least partially arranged in the housing 10, and the gas system 40 provides gas to the combustion system 20, and the gas system 40 is provided with a gas proportional valve 41 located in the housing 10; the water system 60 is at least partially arranged in the housing 10, and the combustion system 20 is used to heat the water flowing through the water system 60. The combustion system 20, the air system 30, and the water system 60 are all connected to the control device 70.

[0061] In this embodiment, the ultrasonic detection module 50 may include an ultrasonic generating transducer and an ultrasonic receiving transducer, and detects gas detection data according to the time difference between the ultrasonic signal emitted by the ultrasonic generating transducer and the ultrasonic signal received by the ultrasonic receiving transducer.

[0062] In this embodiment, the air system 30 may be a fan, so that the outside air is directed into the gas system 40 under the rotation of the fan, so as to provide air to the gas system 40 .

[0063] In one implementation, the ultrasonic detection module 50 is disposed on the gas proportional valve 41. In actual application, the ultrasonic detection module 50 can be disposed on the top, bottom or side of the gas proportional valve 41.

[0064] In another implementation, the ultrasonic detection module 50 can be specifically arranged at the air inlet end of the gas proportional valve 41, that is, it can be arranged at the front end of the gas proportional valve 41; or, the ultrasonic detection module 50 can also be arranged at the air outlet end of the gas proportional valve 41, that is, it can be arranged at the rear end of the gas proportional valve 41. In addition, the ultrasonic detection module 50 can be arranged next to the air inlet end or the air outlet end of the gas proportional valve 41, and the ultrasonic detection module 50 can also be arranged at a distance from the gas proportional valve 41.

[0065] The water system 60 includes a water tank 61, a water inlet pipe 62 and a water outlet pipe 63. The water outlet end of the water inlet pipe 62 and the water inlet end of the water outlet pipe 63 are connected to the water tank 61. The combustion system 20 is located below the water tank 61. The air system 30, the gas system 40 and the ultrasonic detection module 50 are all located below the combustion system 20.

[0066] In this way, by arranging the combustion system 20 below the water tank 61, the fire outlet of the combustion system 20 can better heat the water flow in the water tank 61, and at the same time, the arrangement of the combustion system 20 and the water tank 61 can be more compact; in addition, by arranging the air system 30, the gas system 40 and the ultrasonic detection module 50 below the combustion system 20, the arrangement of the various structures inside the shell 10 can also be made more compact, so that the overall volume of the gas water heater 100100 is smaller.

[0067] In actual application, the specific arrangement of the air system 30, the gas system 40 and the ultrasonic detection module 50 can be: the air system 30 and the gas system 40 are arranged in sequence from left to right, and the ultrasonic detection module 50 is installed on the gas system 40; or, the air system 30 and the gas system 40 are arranged in sequence from right to left, and the ultrasonic detection module 50 is installed on the gas system 40; or, the air system 30 and the gas system 40 are arranged in sequence from top to bottom, and the ultrasonic detection module 50 is installed on the gas system 40.

[0068] Furthermore, in one embodiment, the air system 30 , the gas system 40 , and the ultrasonic detection module 50 are all located between the water inlet pipe 62 and the water outlet pipe 63 .

[0069] In this way, by arranging the air system 30, the gas system 40 and the ultrasonic detection module 50 between the water inlet pipe 62 and the water outlet pipe 63, the water inlet end of the water inlet pipe 62 and the water outlet end of the water outlet pipe 63 can be arranged at the bottom of the shell 10, so as to facilitate the connection between the water inlet end of the water inlet pipe 62 and the tap water supply pipe, and at the same time facilitate the connection between the water outlet end of the water outlet pipe 63 and the water outlet terminal; and also make the arrangement between the air system 30, the gas system 40 and the ultrasonic detection module 50 and the water inlet pipe 62 and the water outlet pipe 63 more compact and regular.

[0070] Furthermore, in one embodiment, the air system 30 is disposed close to the water outlet pipe 63 , and the gas system 40 and the ultrasonic detection module 50 are disposed close to the water inlet pipe 62 .

[0071] In this way, by arranging the air system 30 close to the water outlet pipe 63, and arranging the gas system 40 and the ultrasonic detection module 50 close to the water inlet pipe 62, not only the arrangement of the air system 30, the gas system 40 and the ultrasonic detection module 50 in the space between the water inlet pipe 62 and the water outlet pipe 63 is made more compact and regular, but also the water supply interface (the water inlet end of the water inlet pipe 62) and the gas supply interface (the gas inlet end of the gas system 40) are made close to each other, thereby facilitating personnel to carry out gas and water connection operations.

[0072] Further, see Figure 1 The gas system 40 includes an intake pipe 42, and the gas proportional valve 41 and the ultrasonic detection module 50 are both arranged in the intake pipe 42. In actual application, the intake pipe 42 can be completely arranged inside the housing 10, in which case the ultrasonic detection module 50 will be arranged inside the housing 10; or the intake pipe 42 can also be partially arranged inside the housing 10 and partially extended outside the housing 10, in which case the ultrasonic detection module 50 can be arranged in the portion of the intake pipe 42 located inside the housing 10, or in the portion of the intake pipe 42 located outside the housing 10.

[0073] Further, see Figure 1 , the control device 70 is arranged in the shell 10; the gas system 40 also includes an intake pipe 42, the gas proportional valve 41 is arranged in the intake pipe 42, and is electrically connected to the control device 70; the ultrasonic detection module 50 includes an ultrasonic body 51 and an ultrasonic transducer 52 which are electrically connected to each other, the ultrasonic body 51 is arranged in the control device 70, and is electrically connected to the control device 70, and the ultrasonic transducer 52 is arranged in the intake pipe 42.

[0074] In this way, by setting the ultrasonic body 51 of the ultrasonic detection module 50 on the control device 70, and setting the ultrasonic transducer 52 of the ultrasonic detection module 50 on the intake pipe 42, the ultrasonic signal can be obtained through the ultrasonic transducer 52, and the ultrasonic signal is transmitted to the ultrasonic body 51, and then transmitted to the control device 70. According to the detection of the time difference of the ultrasonic transducer 52 receiving the signal by the control device 70, the gas flow passing through the intake pipe 42 can be accurately calculated in real time through the calculation module of the single-chip microcomputer. By integrating the flow, the actual gas usage of the water heater within a period of time can be obtained. The gas usage can be displayed in real time through the water heater display interface, which is highly practical.

[0075] In actual application, the ultrasonic body 51 and the ultrasonic transducer 52 can be separate structures or connected structures; for example, when the distance between the intake pipe 42 and the control device 70 is relatively close, the ultrasonic body 51 and the ultrasonic transducer 52 can be connected structures; and when the distance between the intake pipe 42 and the control device 70 is relatively far, the ultrasonic body 51 and the ultrasonic transducer 52 can be separate structures, so as to facilitate the assembly of the ultrasonic body 51 and the ultrasonic transducer 52 with the control device 70 and the intake pipe 42 respectively.

[0076] Furthermore, in yet another embodiment, the ultrasonic body 51 and the ultrasonic transducer 52 are provided separately.

[0077] By setting up the ultrasonic body 51 and the ultrasonic transducer 52 separately in this way, not only can the disassembly and assembly of the ultrasonic body 51 and the ultrasonic transducer 52 be facilitated, but also the problem of inconvenience in installation caused by the installation distance between the intake pipe 42 and the control device 70 being too close can be avoided.

[0078] Exemplarily, the ultrasonic body 51 and the ultrasonic transducer 52 may be electrically connected by using conductive structures such as electrical connection wires and electrical sheets, which are not specifically limited herein.

[0079] In the embodiment of the present invention, refer to Figure 2 The control device 70 of the gas water heater 100 includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are connected and communicated through a communication bus. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0080] Those skilled in the art will understand that Figure 2The device structure shown in the figure does not constitute a limitation of the device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0081] like Figure 2 As shown, the memory 1002 as a computer storage medium may include a control program of the gas water heater 100 .

[0082] exist Figure 2 In the device shown, the processor 1001 can be used to call the control program of the gas water heater 100 stored in the memory 1002, and execute the relevant step operations of the control method of the gas water heater 100 in the following embodiment.

[0083] An embodiment of the present invention further provides a control method for a gas water heater, which is applied to the above-mentioned gas water heater.

[0084] Reference Figure 3 , an embodiment of a control method for a gas water heater of the present application is proposed. In this embodiment, the control method for the gas water heater includes:

[0085] Step S10, obtaining gas detection data detected by the ultrasonic detection module;

[0086] When the water heater is turned on or off, the detection data of the ultrasonic detection module is obtained in real time or at intervals of a set duration as the gas detection data here.

[0087] The gas detection data can represent the actual status of the gas currently entering the gas system.

[0088] Among them, the gas detection data will be different if the gas composition introduced into the gas system is different.

[0089] The gas detection data includes but is not limited to at least one of the following parameters: gas density, gas flow, ultrasonic transmission characteristic parameters, gas temperature, gas pressure, etc.

[0090] Step S20, determining the calorific value of the gas according to the gas detection data;

[0091] The calorific value of gas is the heat released when a unit mass of gas currently supplied to the gas water heater is completely burned.

[0092] Different gas detection data corresponds to different gas calorific values.

[0093] The correspondence between the gas detection data and the gas calorific value can be preset, and the correspondence can include a mapping relationship, a calculation formula, an algorithm model, etc. Based on the correspondence, the gas calorific value corresponding to the current gas detection data can be determined. For example, when the correspondence is a preset relationship, the gas detection data can be substituted into the preset relationship to obtain the calculated result as the gas calorific value. When the correspondence includes the correspondence between the data interval of the gas detection data and the calorific value, the target data interval where the gas detection data is located can be determined, and the calorific value corresponding to the target data interval can be used as the current gas calorific value, and so on.

[0094] Among them, the corresponding relationship can be fixed as a preset corresponding relationship, or one of more than one preset corresponding relationships can be determined as the target corresponding relationship according to the actual operating state of the gas water heater, and the gas detection data corresponding to the gas detection data can be determined based on the target corresponding relationship.

[0095] Step S30, controlling the operation of the gas water heater according to the calorific value of the gas so that the air-fuel ratio of the gas water heater reaches a set ratio.

[0096] The target operating parameters of one or more components related to the air-fuel ratio in the gas water heater are determined according to the calorific value of the gas, and the components are controlled to operate according to the corresponding target operating parameters.

[0097] The air-fuel ratio is the ratio of the air volume to the gas volume of the gas water heater. The set ratio is the pre-determined target ratio of the air-fuel ratio when the gas water heater is in a good combustion state.

[0098] When the gas calorific value corresponds to a smaller air-fuel ratio than a set ratio, the gas water heater is controlled to increase the amount of air introduced and / or the gas water heater is controlled to reduce the amount of gas introduced.

[0099] When the gas calorific value corresponding to the air-fuel ratio is greater than the set ratio, the gas water heater is controlled to reduce the amount of introduced air and / or the gas water heater is controlled to increase the amount of introduced gas.

[0100] A control method for a gas water heater is proposed in an embodiment of the present invention. The method sets an ultrasonic detection module in the gas system of the gas water heater, determines the calorific value of the gas during actual use of the water heater based on the gas detection data detected by the ultrasonic detection module, and controls the operation of the gas water heater according to the calorific value of the gas so that its actual air-fuel ratio can reach a set ratio. The change of the gas composition in the gas system can be accurately measured by the ultrasonic detection module, thereby ensuring that even if the actual calorific value of the gas is different from the calibrated calorific value during actual use of the water heater, the air-fuel ratio of the water heater can reach the set ratio required for good combustion, thereby avoiding the occurrence of unstable combustion, excessive smoke, failure to ignite, resonance and the like, thereby effectively improving the combustion quality of the gas water heater.

[0101] Further, based on the above embodiment, another embodiment of the control method of the gas water heater of the present application is proposed. In this embodiment, the gas detection data includes gas density and / or ultrasonic transmission characteristic parameters, referring to Figure 4 , the step S20 comprises:

[0102] Step S21, determining the calorific value of the gas according to the gas density and / or the ultrasonic transmission characteristic parameter.

[0103] In this embodiment, the ultrasonic transmission characteristic parameter includes the ultrasonic transmission speed. In other embodiments, the ultrasonic transmission characteristic parameter may also include the time difference between the ultrasonic emission time and the ultrasonic reception time.

[0104] In one implementation, the correspondence between the gas density and the gas calorific value can be preset, and the correspondence can include a mapping relationship, a calculation formula, an algorithm model, etc., and the gas calorific value corresponding to the current gas density can be determined based on the correspondence. For example, when the correspondence is a preset relationship, the gas density can be substituted into the preset relationship to obtain the calculated result as the gas calorific value. When the correspondence includes the correspondence between the data interval of the gas density and the calorific value, the target data interval where the gas density is located can be determined, and the calorific value corresponding to the target data interval can be used as the current gas calorific value, and so on.

[0105] In another implementation, the correspondence between the ultrasonic transmission characteristic parameter and the gas calorific value can be preset, and the correspondence can include a mapping relationship, a calculation formula, an algorithm model, etc., and the gas calorific value corresponding to the current ultrasonic transmission characteristic parameter can be determined based on the correspondence. For example, when the correspondence is a preset relationship, the ultrasonic transmission characteristic parameter can be substituted into the preset relationship to obtain a calculated result as the gas calorific value. When the correspondence includes the correspondence between the data interval of the ultrasonic transmission characteristic parameter and the calorific value, the target data interval where the ultrasonic transmission characteristic parameter is located can be determined, and the calorific value corresponding to the target data interval can be used as the current gas calorific value, and so on.

[0106] In another implementation, the first gas calorific value may be determined according to the gas density, the second gas calorific value may be determined according to the ultrasonic transmission characteristic parameter, the first weight corresponding to the first gas calorific value and the second weight corresponding to the second gas calorific value may be determined according to the ambient temperature, and the first gas calorific value and the second gas calorific value may be weighted averaged according to the first weight and the second weight to obtain the gas calorific value. Alternatively, the average of the first gas calorific value and the second gas calorific value may be used as the gas calorific value.

[0107] In this embodiment, the calorific value of the gas is determined by detecting the gas density and / or ultrasonic transmission characteristic parameters through the ultrasonic detection module, thereby achieving accurate and effective measurement of the actual calorific value of the gas introduced into the gas water heater, so that the gas water heater can achieve a good combustion state in combination with subsequent control, thereby effectively improving the combustion quality.

[0108] Furthermore, in this embodiment, step S21 includes: obtaining the start-up time of the gas water heater and the rotation speed of the fan in the gas water heater; obtaining the target correspondence between the gas density and / or the ultrasonic transmission characteristic parameter and the gas calorific value according to the start-up time and the rotation speed; and determining the gas calorific value corresponding to the gas density and / or the ultrasonic transmission characteristic parameter according to the target correspondence.

[0109] In this embodiment, the ultrasonic detection module is disposed inside the housing.

[0110] The rotation speed here may be the current rotation speed of the fan, or may be determined based on the fan rotation speed data monitored between the time when the gas water heater is turned on and the current time.

[0111] The target correspondence relationship is different when the opening time and the speed are different. The target correspondence relationship may include a formula, a mapping table, a machine learning model, etc.

[0112] In this embodiment, the initial value of the hot and cold state of the gas water heater is determined according to the opening time, the correction value of the hot and cold state is determined according to the current speed, and the state value representing the current hot and cold state of the water heater is obtained by correcting the initial value according to the correction value. The numerical interval where the state value is located is determined, and the preset correspondence between the gas detection data associated with the numerical interval and the gas calorific value is used as the target correspondence here, wherein different numerical intervals have different associated preset correspondences.

[0113] In this embodiment, since the hot or cold state of the gas water heater will affect the detection accuracy of the ultrasonic detection module on the actual calorific value of the gas, the opening time and the fan speed can accurately reflect the actual hot or cold state of the gas water heater. The target correspondence is determined in combination with the opening time and the fan speed. The gas calorific value is determined based on the corresponding target correspondence, which is beneficial to improve the accuracy of the actual calorific value of the gas determined based on the detection data of the ultrasonic detection module, ensure the accurate control of the air-fuel ratio of the gas water heater based on the calorific value of the gas, and further improve the combustion quality of the gas water heater.

[0114] Further, based on any of the above embodiments, another embodiment of the control method of the gas water heater of the present application is proposed. In this embodiment, the step S30 includes: controlling the opening of the gas proportional valve of the gas water heater according to the gas calorific value so that the air-fuel ratio of the gas water heater reaches a set ratio; and / or controlling the speed of the fan of the gas water heater according to the gas calorific value so that the air-fuel ratio of the gas water heater reaches a set ratio.

[0115] In this embodiment, the opening of the gas proportional valve and / or the speed of the fan are controlled according to the magnitude relationship or the quantitative relationship between the gas calorific value and the standard calorific value. In other embodiments, multiple calorific value intervals may be divided based on the standard calorific value, and a corresponding relationship between the calorific value interval and the control parameters of the fan speed and / or the opening of the gas proportional valve is established, and the corresponding control parameters are determined by determining the calorific value interval in which the gas calorific value is located to control the fan speed and / or the opening of the gas proportional valve.

[0116] Among them, the target opening of the gas proportional valve can be determined according to the gas calorific value, and the gas proportional valve can be controlled to operate at the target opening, or the opening adjustment value of the gas proportional valve can be determined according to the gas calorific value, and the gas proportional valve can be controlled to adjust the opening according to the opening adjustment value. Alternatively, the target speed of the fan can be determined according to the gas calorific value, and the fan can be controlled to operate at the target speed, or the speed adjustment value of the fan can be determined according to the gas calorific value, and the fan can be controlled to adjust the speed according to the speed adjustment value.

[0117] In this embodiment, the gas proportioning valve can be used to adjust the amount of gas introduced, and the fan can be used to adjust the amount of air introduced. Based on this, the operation of the gas proportioning valve and / or the fan is regulated according to the calorific value of the gas, which can ensure that the actual air-fuel ratio of the gas water heater can accurately reach the set ratio.

[0118] Furthermore, in the present embodiment, the step of controlling the rotation speed of the fan of the gas water heater according to the gas calorific value so that the air-fuel ratio of the gas water heater reaches a set ratio includes: when the gas calorific value is greater than the standard calorific value of the gas water heater, controlling the fan to increase the rotation speed; when the gas calorific value is less than the standard calorific value, controlling the fan to reduce the rotation speed.

[0119] The standard calorific value is the calorific value achieved when the gas of a preset gas type is burned in a gas water heater under standard operating conditions.

[0120] The speed adjustment value when the fan speed is reduced or increased can be a preset fixed parameter, or a parameter determined according to the actual operating state of the gas water heater. For example, the speed adjustment value of the fan can be determined according to the temperature difference between the outlet water temperature and the set outlet water temperature and the difference between the gas calorific value and the standard calorific value, and the fan can be controlled to adjust the operating speed according to the speed adjustment value.

[0121] In this embodiment, if the gas calorific value is larger than the standard calorific value, a larger amount of gas is required to make the air-fuel ratio reach the set ratio when the gas volume is constant. At this time, increasing the speed of the fan is conducive to ensuring that the air-fuel ratio can accurately reach the set ratio; if the gas calorific value is smaller than the standard calorific value, a smaller amount of air is required to make the air-fuel ratio reach the set ratio when the gas volume is constant. At this time, reducing the speed of the fan is conducive to ensuring that the air-fuel ratio can accurately reach the set ratio. Based on this, it is conducive to further improving the combustion quality of the gas water heater.

[0122] Furthermore, in this embodiment, when the gas calorific value is greater than the standard calorific value of the gas water heater, the gas proportional valve is controlled to reduce its opening; when the gas calorific value is less than the standard calorific value, the gas proportional valve is controlled to increase its opening.

[0123] The standard calorific value is the calorific value achieved when the gas of a preset gas type is burned in a gas water heater under standard operating conditions.

[0124] The opening adjustment value when the gas proportional valve decreases or increases its opening can be a preset fixed parameter, or can be a parameter determined according to the actual operating state of the gas water heater.

[0125] The gas proportional valve can reduce or increase the opening based on the preset opening corresponding to the standard calorific value.

[0126] In this embodiment, the process for determining the target opening adjustment value when controlling the gas proportional valve to reduce or increase the opening is as follows: obtaining the current first water outlet temperature of the gas water heater; determining the target opening adjustment value based on the first water outlet temperature and the gas calorific value.

[0127] Different first outlet water temperatures and different gas calorific values ​​correspond to different target opening adjustment values. Specifically, the temperature difference between the first outlet water temperature and the set outlet water temperature is determined, and the difference between the gas calorific value and the standard calorific value is determined; the reference opening adjustment value is determined according to the temperature difference; the reference opening adjustment value is corrected according to the difference to obtain the target opening adjustment value.

[0128] The outlet water temperature is set to the target value that the outlet water temperature of the gas water heater needs to reach in advance.

[0129] The target opening adjustment value may be an opening adjustment amplitude or an opening adjustment ratio. A correction value may be determined according to the difference, and the target opening adjustment value may be obtained by increasing or decreasing the reference opening adjustment value according to the correction value.

[0130] In this embodiment, the reference opening adjustment value is the opening adjustment amplitude, and the temperature difference value is positively correlated with the reference opening adjustment value. When the temperature difference value is greater than 0, the reference opening adjustment value is greater than 0, and when the temperature difference value is less than 0, the reference opening adjustment value is less than 0. In this embodiment, the reference opening adjustment value is the opening correction amplitude, and the difference value is negatively correlated with the correction value. When the difference value is greater than 0, the correction value is less than 0, and when the temperature difference value is less than 0, the correction value is greater than 0.

[0131] In this embodiment, if the gas calorific value is larger than the standard calorific value, then a smaller amount of gas is required to make the air-fuel ratio reach the set ratio when the air volume is constant. At this time, reducing the opening of the gas proportional valve is conducive to ensuring that the air-fuel ratio can accurately reach the set ratio; if the gas calorific value is smaller than the standard calorific value, then a larger amount of gas is required to make the air-fuel ratio reach the set ratio when the air volume is constant. At this time, increasing the opening of the gas proportional valve is conducive to ensuring that the air-fuel ratio can accurately reach the set ratio. Based on this, it is conducive to further improving the combustion quality of the gas water heater.

[0132] Among them, in the process of adjusting the opening of the gas proportional valve, the opening is adjusted in combination with the water outlet temperature and the gas calorific value, which is conducive to ensuring a good combustion state while heating the water at a faster heating rate, ensuring the energy efficiency of the gas water heater while ensuring that the water temperature can meet user needs.

[0133] In other embodiments, the target opening adjustment value may also be determined based solely on the relationship between the calorific value of the gas and the standard calorific value.

[0134] Furthermore, in the present embodiment, before the step of controlling the opening of the gas proportional valve of the gas water heater according to the calorific value of the gas so that the air-fuel ratio of the gas water heater reaches a set ratio, it also includes: obtaining a second water outlet temperature of the gas water heater; determining a reference opening of the gas proportional valve according to the second water outlet temperature; and controlling the gas proportional valve to operate at the reference opening for a preset time.

[0135] Specifically, the temperature difference between the second outlet water temperature and the set outlet water temperature is determined, and a reference opening is determined based on the temperature difference, and the temperature difference is positively correlated with the reference opening.

[0136] The preset duration may be a preset fixed duration, or a duration determined according to the actual operation of the gas water heater. For example, the preset duration here may be determined according to the detection frequency of the ultrasonic detection module.

[0137] In this embodiment, the gas proportional valve first operates at a reference opening that matches the outlet water temperature of the gas water heater for a preset period of time and then adjusts the opening to adapt to the calorific value of the gas. This is beneficial to ensure that the water heater can heat water quickly and improve the efficiency of the outlet water temperature to meet user needs.

[0138] Further, based on any of the above embodiments, another embodiment of the control method of the gas water heater of the present application is proposed. Figure 5 , after step S10, further comprising:

[0139] Step S201, determining the type of gas introduced into the gas system according to the gas detection data;

[0140] The gas type may include but is not limited to one of the following types: natural gas or liquefied petroleum gas, etc.

[0141] Different types of gas and different components of gas will result in different ultrasonic transmission speeds, and thus different gas detection data detected by the ultrasonic detection module.

[0142] Different gas detection data corresponds to different gas types. Specifically, different data intervals are associated with different preset gas types. By determining the data interval where the gas detection data is located, the preset gas type corresponding to the data interval is used as the gas type of the gas currently introduced into the gas system.

[0143] In this embodiment, the gas water heater executes step S10 when receiving the combustion start instruction.

[0144] Step S202, when the gas type matches the preset type corresponding to the gas water heater, the gas water heater is controlled to start combustion to execute the step of determining the calorific value of the gas according to the gas detection data.

[0145] The preset types are specifically the types of gas allowed to be used in gas water heaters.

[0146] In the above embodiment, when the gas type matches the preset type, the gas proportional valve first operates according to the above reference opening for a preset time, and then adjusts the opening according to the calorific value of the gas.

[0147] In this embodiment, the type of gas introduced is detected by an ultrasonic detection module. When the gas type matches the preset type, the gas water heater is controlled to start combustion and the air-fuel ratio is further adjusted based on the actual calorific value of the gas, thereby preventing unauthorized gas from entering the water heater and damaging the water heater or even causing a safety accident, thereby effectively protecting the gas water heater and improving safety.

[0148] Furthermore, in this embodiment, after step S201, it also includes: when the gas type does not match the preset type, controlling the gas water heater to prohibit combustion and outputting an alarm prompt message.

[0149] The output of the alarm prompt information may include but is not limited to the following forms: sound prompt, push information, light prompt, etc. The alarm prompt information is used to prompt the state that the current gas type does not match the preset type.

[0150] In this embodiment, when the gas type does not match the preset type, the gas water heater is prohibited from starting combustion and an alarm is sounded, which is conducive to further improving the safety of use, while allowing users to promptly know the current abnormal state of the gas water heater and deal with it in time to ensure the normal operation of the gas water heater.

[0151] In addition, an embodiment of the present invention further proposes a storage medium, on which a control program for a gas water heater is stored. When the control program for the gas water heater is executed by a processor, the relevant steps of any embodiment of the above gas water heater control method are implemented.

[0152] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0153] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0154] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, gas water heater, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0155] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A control method for a gas water heater, characterized in that: The gas system of the gas water heater is provided with an ultrasonic detection module, and the control method of the gas water heater comprises the following steps: Acquiring gas detection data detected by the ultrasonic detection module; Determining the calorific value of the gas according to the gas detection data; The gas water heater is controlled to operate according to the gas calorific value so that the air-fuel ratio of the gas water heater reaches a set ratio.

2. The control method of the gas water heater according to claim 1, characterized in that: The gas detection data includes gas density and / or ultrasonic transmission characteristic parameters, and the step of determining the gas calorific value according to the gas detection data includes: The calorific value of the gas is determined according to the gas density and / or the ultrasonic transmission characteristic parameter.

3. The control method of the gas water heater according to claim 2, characterized in that: The step of determining the calorific value of the gas according to the gas density and / or the ultrasonic transmission characteristic parameter comprises: Obtaining the start-up time of the gas water heater and the rotation speed of the fan in the gas water heater; Acquire a target corresponding relationship between the gas density and / or the ultrasonic transmission characteristic parameter and the gas calorific value according to the opening time and the rotation speed; The gas density and / or the gas calorific value corresponding to the ultrasonic transmission characteristic parameter is determined according to the target corresponding relationship.

4. The control method of the gas water heater according to claim 1, characterized in that: The step of controlling the operation of the gas water heater according to the calorific value of the gas so that the air-fuel ratio of the gas water heater reaches a set ratio comprises: controlling the opening of the gas proportional valve of the gas water heater according to the gas calorific value so that the air-fuel ratio of the gas water heater reaches the set ratio; and / or, The rotation speed of the fan of the gas water heater is controlled according to the calorific value of the gas so that the air-fuel ratio of the gas water heater reaches the set ratio.

5. The control method of the gas water heater according to claim 4, characterized in that: The step of controlling the speed of the fan of the gas water heater according to the calorific value of the gas so that the air-fuel ratio of the gas water heater reaches a set ratio comprises: When the calorific value of the gas is greater than the standard calorific value of the gas water heater, controlling the fan to increase the rotation speed; When the calorific value of the gas is less than the standard calorific value, the fan is controlled to reduce its rotation speed.

6. The control method of the gas water heater according to claim 4, characterized in that: The step of controlling the opening of the gas proportional valve of the gas water heater according to the gas calorific value so that the air-fuel ratio of the gas water heater reaches a set ratio comprises: When the calorific value of the gas is greater than the standard calorific value of the gas water heater, controlling the gas proportional valve to reduce its opening; When the gas calorific value is less than the standard calorific value, the gas proportional valve is controlled to increase its opening.

7. The control method of the gas water heater according to claim 6, characterized in that: The process for determining the target opening adjustment value when controlling the gas proportional valve to reduce or increase the opening is as follows: Obtaining a current first outlet water temperature of the gas water heater; The target opening adjustment value is determined according to the first outlet water temperature and the gas calorific value.

8. The control method of the gas water heater according to claim 7, characterized in that: The step of determining the target opening adjustment value according to the first outlet water temperature and the gas calorific value comprises: Determine the temperature difference between the first outlet water temperature and the set outlet water temperature, and determine the difference between the gas calorific value and the standard calorific value; Determine a reference opening adjustment value according to the temperature difference value; The reference opening adjustment value is corrected according to the difference to obtain the target opening adjustment value.

9. The control method of the gas water heater according to claim 6, characterized in that: Before the step of controlling the opening of the gas proportional valve of the gas water heater according to the gas calorific value so that the air-fuel ratio of the gas water heater reaches a set ratio, the method further includes: Obtaining a second outlet water temperature of the gas water heater; determining a reference opening of the gas proportional valve according to the second outlet water temperature; The gas proportional valve is controlled to operate at the reference opening for a preset time period.

10. The control method of a gas water heater according to any one of claims 1 to 9, characterized in that: After the step of obtaining the gas detection data detected by the ultrasonic detection module, the method further includes: Determining the type of gas introduced into the gas system according to the gas detection data; When the gas type matches the preset type corresponding to the gas water heater, the gas water heater is controlled to start combustion to execute the step of determining the calorific value of the gas according to the gas detection data.

11. The control method of the gas water heater according to claim 10, characterized in that: After the step of determining the type of gas introduced into the gas system according to the gas detection data, the method further includes: When the gas type does not match the preset type, the gas water heater is controlled to prohibit combustion and output an alarm prompt message.

12. A gas water heater, characterized in that: The gas water heater comprises: case; A combustion system, disposed in the housing; an air system, disposed in the housing, the air system providing air to the combustion system; a gas system, at least partially disposed in the shell, the gas system providing gas to the combustion system, the gas system being provided with a gas proportional valve disposed in the shell; An ultrasonic detection module, provided in the gas system, for detecting the amount of gas flowing through the gas system; a water system, at least partly disposed in the shell, the combustion system being used to heat water flowing through the water system, the water system comprising a water tank, a water inlet pipe and a water outlet pipe, the water outlet end of the water inlet pipe and the water inlet end of the water outlet pipe being connected to the water tank, the combustion system being located below the water tank, and the air system, the gas system and the ultrasonic detection module being located below the combustion system; A control device, the ultrasonic detection module is connected to the control device, the control device comprises: a memory, a processor and a control program for the gas water heater stored in the memory and executable on the processor, the control program for the gas water heater, when executed by the processor, implements the steps of the control method for the gas water heater as described in any one of claims 1 to 11.

13. A storage medium, characterized in that: The storage medium stores a control program for the gas water heater, and when the control program for the gas water heater is executed by the processor, the steps of the control method for the gas water heater according to any one of claims 1 to 11 are implemented.

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