Hybrid energy water heater control method and water heater

Abstract

The application discloses a mixed energy water heater control method and a gas water heater, and comprises the following steps: detecting the water flow flowing through the water heater; judging the current water use mode according to the water flow; selecting a heating mode according to the current water use mode, and executing a control heating step. The mixed energy water heater control method detects the water flow flowing through the water heater, different water flows correspond to corresponding heating modes, the heating mode is determined according to the water flow, the water flow reflects the demand for heat, and then the appropriate heating mode can be automatically selected according to the water flow, and the corresponding heating control is executed, so that the user does not need to manually adjust and switch, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hot water heating device, and particularly relates to a mixed energy water heater control method and a water heater. BACKGROUND

[0002] At present, some water heaters use mixed energy heating, such as configuring a gas heating part and an electric heating part in a gas water heater.

[0003] However, the gas heating water generally has the technical problem of slow temperature rise. The water demand of household water is different, and the water quantity used is also different. For example, the water quantity required for washing hands and washing vegetables is small, which leads to frequent opening of the gas water heater, and the hot water waiting time is long. When the hot water is first output, the user's water use may be finished, which leads to poor user experience and waste of gas.

[0004] In addition, the gas heating and electric heating switching logic is manually realized through the keys on the display panel. The switching logic can be switching between gas and electric heating. Alternatively, a default heating method (gas) is used, and the default heating method is switched back after a certain time after each key switching. SUMMARY

[0005] The present application proposes a mixed energy water heater control method to solve the above problems, aiming at the technical problem of inconvenient operation of the existing mixed energy water heater which needs to manually switch different heating modes.

[0006] To achieve the above-mentioned application purposes, the present application adopts the following technical solutions:

[0007] A mixed energy water heater control method, comprising the following steps:

[0008] Detecting the water flow rate flowing through the water heater;

[0009] Judging the currently opened water use mode according to the water flow rate;

[0010] Selecting a heating mode according to the currently opened water use mode and executing a heating control step.

[0011] Further, before the step of judging the currently opened water use mode according to the water flow rate, the method further comprises a step of clustering the water use time, comprising:

[0012] Recording the water use time and water flow rate each time;

[0013] Clustering the water use time to cluster different water use modes into different classes;

[0014] Obtaining the average flow rate of each water use mode;

[0015] In the step of determining the currently active water usage mode based on the water flow rate, the water flow rate through the water heater is compared with the average flow rate of each water usage mode to determine the currently active water usage mode.

[0016] Furthermore, the water usage modes include at least a bathing mode and other modes besides the bathing mode;

[0017] When the current water usage mode is bathing mode, the burner will be activated to heat the water; otherwise, the electric heating module will be activated to heat the water.

[0018] The average water flow rate in the shower mode is greater than that in other modes.

[0019] Further steps for clustering water usage duration include:

[0020] (1) Assign each sample to a class and calculate the distance between any two classes;

[0021] (2) Find the two classes with the closest water usage time and aggregate the two classes into one class;

[0022] (3) Recalculate the distance between the newly generated class and other classes, and return to step (2) until the distance between classes no longer satisfies the aggregation condition.

[0023] Furthermore, in the step of detecting the water flow rate through the water heater, if the water flow rate through the water heater is greater than the first flow rate, the currently activated water usage mode is determined based on the water flow rate; otherwise, the determination is not performed.

[0024] Furthermore, in the step of clustering water usage duration, the recording of each water usage duration also includes a step of determining whether the water usage is valid. When the water usage duration is not less than a first set time, it is determined to be valid water usage, and the water usage duration and water flow rate are recorded.

[0025] Furthermore, in the heating control step, when the current heating mode is electric heating module heating, the step also includes a step of adjusting and determining the heating method:

[0026] Determine if the current water flow rate through the water heater is greater than the second flow rate. If the current water flow rate is greater than the second flow rate, start the burner to heat the water; otherwise, do not start the burner to heat the water.

[0027] Furthermore, in the heating control step, when the initial determined heating mode is burner heating, the step also includes a step of adjusting the heating method:

[0028] The inlet and outlet water temperatures of the electric heating module were measured separately.

[0029] When the water inlet temperature of the electric heating module is greater than or equal to the first temperature value or when the water outlet temperature of the electric heating module is greater than or equal to the second temperature value, the current heating mode is maintained, otherwise, the electric heating module is started simultaneously.

[0030] Further, when the burner and the electric heating module are both in the starting state, it is further judged whether the current water flow is greater than a third flow, and if the current water flow is greater than the third flow, the flow regulating module is controlled to reduce the water flow.

[0031] The application further provides a gas water heater, which comprises a water heater main body, wherein the water heater main body comprises a burner, a heat exchanger, an electric heating module, a water inlet pipe and a water outlet pipe, and the water heater main body is further provided with a control device, wherein the control device comprises a processor, a memory and a control program of the gas water heater stored in the memory and executable by the processor, and further comprises:

[0032] A water flow detection module is arranged in the water inlet pipe or the water outlet pipe and used for detecting the water flow flowing through the water heater, and the control device controls heating according to the control method described in any one of the preceding aspects.

[0033] Compared with the prior art, the application has the following advantages and positive effects: the mixed energy water heater control method detects the water flow flowing through the water heater, different water flows correspond to corresponding heating modes, the heating mode is determined according to the water flow, the water flow reflects the demand for heat, and then the appropriate heating mode can be automatically selected according to the water flow, and the corresponding heating control is performed, without the need for manual adjustment and switching of the user, thereby improving the user experience.

[0034] Other characteristics and advantages of the application will become more apparent after reading the specific embodiments of the application in combination with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0036] Figure 1 The structure schematic diagram of one embodiment of the mixed energy water heater is shown in the figure.

[0037] Figure 2 The flow chart of one embodiment of the mixed energy water heater control method is shown in the figure.

[0038] Figure 3 The clustering schematic diagram of 5 times of water use in the first embodiment of the application is shown in the figure. DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0040] It should be noted that, in the description of the present application, the terms of "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating the direction or position relationship are based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0041] Embodiment one

[0042] The embodiment provides a mixed energy water heater control method, wherein the gas water heater used in the embodiment comprises a burner 100, a heat exchanger 200, an electric heating module 300, a control device 400, a water inlet pipe 601, a water outlet pipe 602 and a fan (not shown in the figure) and the like. Figure 1 The control device 400 comprises a processor, a memory and a control program of the gas water heater stored in the memory and executable by the processor.

[0043] The burner 100 can burn gas to heat the water flowing in the heat exchanger 200, and the electric heating module 300 uses the principle of electric heating to electrically heat the water flowing through. The water inlet pipe 601 is connected with the water supply pipe in the user's home to introduce cold water, and the water outlet pipe 602 is connected with the water terminal (hot water tap) in the user's home to output hot water.

[0044] As shown in Figure 2 The mixed energy water heater control method of the embodiment comprises the following steps:

[0045] Detecting the water flow flowing through the water heater.

[0046] The water heater of the scheme is especially for instant heating water heater, and only when the water using point is opened to use water, the heating is started, so that the water using demand of people can be met, and the energy consumption is greatly saved.

[0047] Judging the current water using mode according to the water flow.

[0048] According to the current open water mode selection heating mode, execute control heating step.

[0049] The method is suitable for large flow water heating according to the characteristics of gas heating and electric heating, that is, gas heating has the technical problem of high hot water capacity but long hot water waiting time, and electric heating has the technical problem of low hot water capacity but high hot water capacity. The method is suitable for small flow water heating. Based on this, the method determines the current open water mode according to the water flow, determines the corresponding heating mode according to the water mode, and executes the heating step to select the heating mode suitable for the water flow of the water mode. The heating mode in this embodiment includes gas heating and electric heating, and of course other existing heating water modes can also be used.

[0050] As a household heating water, generally has multiple water points, now three water points are used as an example, in household water, water points can include kitchen faucet water point, bathroom faucet water point and bathroom shower water point, etc. According to the conventional water habit, the kitchen faucet water point can be classified as small flow water mode for washing fruits and vegetables, washing dishes, etc. Similarly, the bathroom faucet water point can also be classified as small flow water mode for washing and other needs. The bathroom shower water point is generally used for bathing, which can be classified as large flow water mode.

[0051] In this embodiment, before the step of determining the current open water mode according to the water flow, a step of clustering the water use duration is further included, which comprises:

[0052] Record the water flow and water use duration each time;

[0053] Cluster the water use duration, and cluster different water modes into different classes;

[0054] Obtain the average flow of each water mode;

[0055] In the step of determining the current open water mode according to the water flow, the water flow flowing through the water heater is compared with the average flow of each water mode to determine the current open water mode.

[0056] According to the clustering of the water use time, the bathing water and the vegetable washing and hand washing water are distinguished, and the average flow range of the bathing water and the hand washing and vegetable washing water is obtained according to the clustering result. For the large flow water use mode such as the bathing water, the gas heating is adopted, and for the small flow water use mode such as the hand washing and vegetable washing water, the electric heating is used. According to the water flow division, the water use mode at least includes the bathing mode and other modes except the bathing mode. It can be understood that the water flow of the bathing mode is greater than that of the other modes except the bathing mode. Of course, the other modes can be further finely divided according to the water flow.

[0057] The gas water heater in the embodiment includes two heating modes of the electric heating and the gas heating. The optimal heating mode is different according to the water demand.

[0058] For example, because the electric heating mode has the advantage of fast heating, but the power of the electric heating is limited, for the small flow water use mode, that is, the other modes except the bathing mode, the electric heating mode is preferred, and when the electric heating can meet the water demand, the gas heating does not need to be started. The gas heating has the advantage of high heating capacity, and for the large flow water use mode, that is, the bathing mode, the gas heating mode is preferred to meet the hot water demand of the user.

[0059] The cluster analysis is a technique for finding an inherent structure among data. According to the attributes of the samples, a mathematical method is used to quantitatively determine the close and distant relationship between the samples according to a certain similarity or difference index, and the samples are classified according to the close and distant relationship. The general rule is to classify the points with small "distance" or large "similarity coefficient" into the same class, and to classify the points with large "distance" or small "similarity coefficient" into different classes.

[0060] There are many methods for calculating the cluster distance index D (distance). According to the different properties of the data, different distance indexes can be selected. The Euclidean distance, the squared Euclidean distance, the Manhattan distance (Block), the Chebychev distance, the Chi-square measure, etc. Among them, the squared Euclidean distance is the most commonly used distance measurement method.

[0061] Hierarchical clustering is a very intuitive algorithm. As the name suggests, it involves clustering data layer by layer. It can merge smaller clusters from bottom to top or divide larger clusters from top to bottom. Bottom-up clustering is more commonly used. Specifically, it finds the two clusters with the shortest distance each time and merges them into a larger cluster until all clusters are merged into one.

[0062] Clustering is an unsupervised learning task that uses algorithms to find natural groups (clusters) of observed samples based on the internal structure of data. The main advantage of hierarchical clustering is that clusters no longer need to be assumed to be spherical. Furthermore, it can be extended to large datasets, and the results can be flexibly adjusted according to specific needs. Use cases include customer segmentation, news clustering, and article recommendation.

[0063] In this embodiment, the preferred step of clustering water usage duration includes:

[0064] S1. Assign each sample to a class and calculate the distance between any two classes;

[0065] S2. Find the two classes with the closest water usage duration and aggregate these two classes into one class;

[0066] S3. Recalculate the distance between the newly generated class and other classes, and return to step S2 until the distance between classes no longer satisfies the aggregation condition.

[0067] The clustering process takes the duration of each water usage session as input and outputs the cluster category to which that duration belongs.

[0068] Aggregation conditions refer to the conditions under which two classes can aggregate if the distance between them is not greater than a set distance; otherwise, aggregation is not possible. The set distance can be configured according to actual needs.

[0069] like Figure 3 The image shows five water usage records. Two vectors were extracted: water usage duration and average flow rate. The numbers 1 through 5 correspond to the five water usage records. First, the water usage duration was clustered: the distance between 1 and 2 is 0.3, 1 and 3 is 0.3, 1 and 4 is 13, 1 and 5 is 14, 2 and 3 are 0.6, 2 and 4 are 12.7, 2 and 5 are 13.7, 3 and 4 are 13.3, 3 and 5 are 14.3, and 4 and 5 are 1. The average of all distances is 8.32.

[0070] Therefore, the first, second, and third water usages clustered into one group, with an average water usage duration of 1 minute; the fourth and fifth water usages clustered into another group, with an average water usage duration of 14.5 minutes. The distance between these two groups of data is greater than the average of 8.32, so they no longer cluster.

[0071] Another sample of the first, second, and third water use - average flow, and then taking the average, 3.07 is obtained. This value is considered to be a certain water use behavior, such as washing dishes. The next time the water heater detects a flow of 3.07 l / min, it is considered to be dishwashing water, and the electric heating is turned on. 3.07 needs to be set to a range, such as plus or minus 0.5.

[0072] Similarly, the average flow of the fourth and fifth water use is 7.5 L / min, which is considered to be the user using the shower to take a bath, and the gas heating is turned on.

[0073] The preferred method for detecting whether a water use point has turned on water in this embodiment is:

[0074] Detect the water flow through the water heater. When there is water flow, it is determined that there is a water use point that has turned on water.

[0075] Alternatively, the water use on state of each water use point is detected separately. When at least one water use point is turned on, it is determined that there is a water use point that has turned on water. When this detection and determination method is used, each water use point has a sending module, and the gas water heater has a receiving module. Each water use point communicates with the receiving module, and the gas water heater is installed in the user's home. The sending module of each water use point is paired with the receiving module, and different flow patterns are defined for each water use point.

[0076] The communication method of the sending module and the receiving module can be, but is not limited to, power carrier, Lora, BLE, Zegbee, Wifi, 433, 485, etc.

[0077] In order to prevent the situation where the water flow is small although water flow is detected due to the water use point not being closed tightly or the water pressure fluctuating in the pipe network, and to avoid false heating, in this embodiment, before controlling heating, it is preferred that when the water flow through the water heater is greater than a first flow, the current water use mode that is turned on is determined according to the water flow, and otherwise, no determination is performed.

[0078] Not performing the determination of the current water use mode that is turned on is a necessary precondition for the control heating step. If the determination is not performed, the control heating step cannot be performed accordingly, to ensure safe water heating.

[0079] In this embodiment, the control heating step is to control the start of the burner heating or to control the start of the electric heating module heating.

[0080] In the step of clustering the water use time, the recording of each water use time further comprises a step of judging whether the current water use is valid. When the water use time is not less than the first set time, the current water use is judged to be valid, and the water use time and water flow are recorded. For example, the first set time can be set to 5 seconds, that is, when the continuous water use is not less than 5 seconds, the water use is considered to be valid.

[0081] In the foregoing step, the water use mode is judged according to the initial water flow. During the actual water use of the user, the use intention of the user can be temporarily changed, or multiple water use points can join the water use. If the electric heating module is started to heat at this time, the current water use demand cannot be obviously met. In order to improve the universality of the control method and meet the control of various situations, the control heating step of the embodiment further comprises a step of adjusting the heating mode.

[0082] Preferably, in the control heating step, when the current heating mode is the electric heating module heating, the step of adjusting the heating mode is further included.

[0083] The water flow flowing through the water heater is judged. If the current water flow is greater than the second flow, the burner is started to heat, otherwise, the burner is not started to heat.

[0084] The water flow reflects the water use state of the user. If the current water flow is greater than the second flow, it is indicated that although the current water use point is determined to be the small-flow water use mode, the actual water flow is large. Therefore, when the current water flow is greater than the second flow, the burner is started to heat, so as to meet the actual water use demand of the user, prevent the heating water capacity from being unable to meet the demand of the user, and improve the user experience.

[0085] The second flow is greater than the first flow.

[0086] In the control heating step, when the heating mode judged initially is the burner heating, the step of adjusting the heating mode is further included.

[0087] The water inlet temperature and the water outlet temperature of the electric heating module are detected respectively.

[0088] When the water inlet temperature of the electric heating module is greater than or equal to the first temperature value or when the water outlet temperature of the electric heating module is greater than or equal to the second temperature value, the current heating mode is maintained, the electric heating module is not started, otherwise, the electric heating module is started. The scheme can further save the electric energy consumption, which can avoid the situation that the electric heating module 300 is frequently started when the user frequently starts the water use.

[0089] The water heater has two states when starting. One is that the time interval from the previous starting time is short, and the water temperature in the water heater and the pipeline is high. At this time, by judging the water inlet temperature or the water outlet temperature of the electric heating module 300, either of which meets or approaches the user's demand, it is indicated that the water temperature in the pipeline can meet the user's demand, and there will be no cold water or undercooked water. Subsequent hot water is heated by the burner 100.

[0090] The other is that the time interval from the previous starting of the water heater is long, and the water temperature in the water heater and the pipeline is reduced. When the opening condition of the electric heating module 300 is met, the electric heating module 300 needs to be started to assist heating. At the same time, when the opening condition of the burner 100 is met, the burner 100 needs to be ignited and burned to perform main heating.

[0091] When the water inlet temperature of the electric heating module is greater than or equal to the first temperature value, it is indicated that the water inlet temperature of the electric heating module meets or approaches the user's demand, and the electric heating module does not need to be started to avoid increasing the electric energy consumption, so the electric heating module is not started.

[0092] When the water outlet temperature of the electric heating module is greater than or equal to the first temperature value, it is indicated that the water temperature of the hot water output from the electric heating module meets or approaches the user's demand, and the electric heating module does not need to be started to avoid increasing the electric energy consumption, so the electric heating module is not started.

[0093] In the control heating step, if the control heating step judges to start the burner heating, before controlling the starting of the burner, a step of judging whether the burner starting condition is met is further included:

[0094] Whether the current water flow is greater than the second flow is judged. If the current water flow is greater than the second flow, the burner heating is started, otherwise, the burner heating is not started, to ensure the safety of the gas heating and prevent the water in the pipeline from being gasified if the burner is started due to the small water flow, which affects the safety of the system.

[0095] When part of the water in the burner 100 has not been heated to the target heating temperature, the water flows out of the burner 100, and at this time, the electric heating module 300 can assist in continuing to heat it to reach the target heating temperature.

[0096] When the burner and the electric heating module are in the starting state, it is indicated that the water outlet temperature of the current burner 100 is low. In order to quickly reach the set target heating temperature, when the burner and the electric heating module are in the starting state, it is further judged whether the current water flow is greater than the third flow. If the current water flow is greater than the third flow, the flow regulating module is controlled to reduce the water flow.

[0097] Specifically, when the water outlet temperature of the burner 100 is low and the water outlet temperature of the electric heating module 300 is also low, if the water flow is large at this time, it means that the energy consumption demand for heating the current water flow to the target heating temperature is high, and it cannot be achieved in a short time. Therefore, in the embodiment, the water flow is reduced in this way. When the water flow is reduced, the water flow temperature can be quickly raised to the target heating temperature under the condition that the energy supply remains unchanged, thereby reducing the user waiting time.

[0098] There are various ways to adjust the water flow, and a water servo or a water valve with adjustable opening degree can be used to achieve this. In the embodiment, the water servo is taken as an example for description.

[0099] The water servo, also known as a water servo valve, mainly includes a valve body, a water flow rotor assembly, a sensor, a valve core assembly, and a motor (not shown in the figure). When a water point is opened for water use, the water flow passes through, the magnetic water flow rotor rotates, the sensor senses and transmits the current to the control device 400, and the control device 400 quickly calculates according to the target heating temperature to control the motor to drive the valve core assembly to adjust the water flow size of the water outlet. The water servo valve is mainly used to cooperate with the adjustment of the gas proportional valve to achieve the best combustion state, thereby achieving the purpose of constant temperature.

[0100] Basic operation logic of the water servo:

[0101] 1. The water flow rotor assembly itself is a magnetic component. When the water flow passes through, it impacts the water flow rotor and causes rotation.

[0102] 2. The Hall sensor outside the valve body senses the change of the magnetic field and generates a corresponding pulse current, which is sent to the control device 400.

[0103] 3. Then the motor corresponds to the valve core assembly inside. The motor controls the opening and closing degree of the valve core assembly to achieve control of the water flow size.

[0104] Based on the operation principle of the water servo, the method for reducing the water flow of the flow control adjustment module in the embodiment includes:

[0105] Obtaining the water servo step number L;

[0106] Adjusting the water servo step number to L-△L, where 0<△L<L.

[0107] The control device 400 calculates the target water flow according to the current flow and the target heating temperature. The target water flow corresponds to the adjustment step number △L, and the adjustment of the water servo is realized.

[0108] The embodiment also includes the step of obtaining the set target heating temperature, and determining the first temperature value and the second temperature value according to the target heating temperature.

[0109] The target heating temperature can be the bathing temperature set by the user. If the user does not set it, the target heating temperature is the system default setting.

[0110] In a preferred embodiment, since the water output from the electric heating module 300 is piped directly to the water supply point, the water outlet temperature of the electric heating module 300 can reflect the target heating temperature.

[0111] In this embodiment: First temperature value = Target heating temperature - ΔT1;

[0112] Second temperature value = target heating temperature.

[0113] ΔT1 is a suitable value based on the matching of the whole system, and its value range can be [1,5].

[0114] Example 2

[0115] This embodiment also proposes a gas water heater, such as... Figure 1 As shown, the water heater includes a main body, which comprises a burner 100, a heat exchanger 200, an electric heating module 300, a water flow detection module 700, an inlet pipe 601, and an outlet pipe 602. The main body also includes a control device 400, which includes a processor, a memory, and a control program for the gas water heater stored in the memory that can be executed by the processor. It also includes a human detection module 800, which is located at the target water point and is used to detect the presence of human beings in the surrounding area of ​​the target water point and send the information to the control device 400. The control device 400 controls the heating according to the control method described in Embodiment 1.

[0116] In this embodiment, the water flow detection module also has a flow regulation function, that is, the flow rate passing through it can be determined according to its own opening degree.

[0117] The burner 100 burns gas to heat the water flowing in the heat exchanger 200, while the electric heating module 300 uses electric heating to electrically heat the water. The inlet pipe 601 connects to the user's home water supply to introduce cold water, and the outlet pipe 602 connects to the user's home water terminal (hot water tap) to output hot water. Specific structural configurations of the gas water heater are not limited or elaborated upon here.

[0118] The water flow detection module 700 can be installed in the inlet pipe or outlet pipe of the gas water heater. Preferably, the water flow detection module 700 is installed in the inlet pipe 800. The water flow detection module 700 is electrically connected to the control module 400 and its opening degree is adjusted by the control module 400 to regulate the water flow entering the water heater.

[0119] The water flow detection module 700 is arranged in the water inlet pipe 800, and because the water flow is not heated, the water temperature is normal temperature water, which will not damage the water flow detection module 700, and is beneficial to prolong the service life of the water flow detection module 700.

[0120] The gas water heater also comprises a first temperature detection module 901 and a second temperature detection module 902, wherein the first temperature detection module 901 is arranged at the water inlet end of the electric heating module 300 and is used for detecting the water inlet temperature of the electric heating module 300; and the second temperature detection module 902 is arranged at the water outlet end of the electric heating module 300 and is used for detecting the water outlet temperature of the electric heating module 300.

[0121] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can still be modified or some technical features can be replaced by equivalents for those skilled in the art; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed by the present application.

Claims

1. A hybrid energy water heater control method, characterized by, The method comprises the following steps: detecting the water flow rate flowing through the water heater; judging the current water use mode according to the water flow rate; selecting a heating mode according to the current water use mode, and performing the control heating step; before the step of judging the current water use mode according to the water flow rate, the method further comprises a step of clustering the water use time, comprising: recording the water use time and the water flow rate each time; clustering the water use time, and grouping different water use modes into different classes; obtaining the average flow rate of each water use mode; in the step of judging the current water use mode according to the water flow rate, the water flow rate flowing through the water heater is compared with the average flow rate of each water use mode to judge the current water use mode.

2. The hybrid energy water heater control method of claim 1, wherein, The water use mode at least comprises a bathing mode and other modes except the bathing mode; when the current water use mode is the bathing mode, the burner is controlled to be started to heat; otherwise, the electric heating module is controlled to be started to heat; the average water flow rate of the bathing mode is greater than the average water flow rate of other modes.

3. The hybrid energy water heater control method of claim 2, wherein, The step of clustering the water use time comprises: (1) each sample is classified into a class, and the distance between each two classes is calculated; (2) the two classes with the closest distance in the water use time are found, and the two classes are aggregated into one class; (3) the distance between the newly generated class and other classes is recalculated, and the step (2) is returned until the distance between the classes no longer meets the aggregation condition.

4. The hybrid energy water heater control method of claim 2, wherein, In the step of detecting the water flow rate flowing through the water heater, when the water flow rate flowing through the water heater is greater than a first flow rate, the current water use mode is judged according to the water flow rate; otherwise, the judgment is not performed.

5. The hybrid energy water heater control method of claim 1, wherein, In the step of clustering the water use time, when recording the water use time each time, the step of judging whether the current water use is valid is further included; when the water use time is not less than a first set time, the current water use is judged as valid water use, and the water use time and the water flow rate of this time are recorded.

6. The hybrid energy water heater control method of claim 1, wherein, In the control heating step, when the current heating mode is the electric heating module heating, the step of adjusting and judging the heating mode is further included: judging whether the current water flow rate flowing through the water heater is greater than a second flow rate; if the current water flow rate is greater than the second flow rate, the burner is started to heat; otherwise, the burner is not started to heat.

7. The hybrid energy water heater control method of claim 1, wherein, In the control heating step, when the initially judged heating mode is the burner heating, the step of adjusting and judging the heating mode is further included: respectively detecting the inlet water temperature and the outlet water temperature of the electric heating module; when the inlet water temperature of the electric heating module is greater than or equal to a first temperature value or when the outlet water temperature of the electric heating module is greater than or equal to a second temperature value, the current heating mode is maintained; otherwise, the electric heating module is started at the same time.

8. The hybrid energy water heater control method of claim 7, wherein, When the burner and the electric heating module are both in the started state, it is judged whether the current water flow rate is greater than a third flow rate; if the current water flow rate is greater than the third flow rate, the flow rate adjusting module is controlled to reduce the water flow rate.

9. A gas water heater, characterised by, The water heater comprises a water heater body, the water heater body comprises a burner, a heat exchanger, an electric heating module, a water inlet pipe and a water outlet pipe, and the water heater body further comprises a control device, the control device comprises a processor, a memory and a control program of the gas water heater stored in the memory and executable by the processor, and further comprises: A water flow detecting module is arranged in the water inlet pipe or the water outlet pipe for detecting the water flow through the water heater, and the control device controls the heating according to the control method of any one of claims 1-8.

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