Method and device for overcurrent protection of a gas water heater and gas water heater

Abstract

The application provides a method and device for overcurrent protection of a gas water heater and the gas water heater. When it is monitored that the ignition needle of the gas water heater ignites, the current on the fan driving board is detected. If the current is greater than or equal to a preset peak current threshold, it is determined that the current on the fan driving board is overcurrent, and a counter is triggered to add 1 to the overcurrent frequency. If the current overcurrent frequency recorded on the counter is greater than or equal to a preset overcurrent frequency threshold, the PWM is controlled to be closed. It is determined that an overcurrent protection failure occurs, and the gas water heater is shut down. Compared with the prior art, the application takes the cumulative results of the overcurrent frequency on the fan driving board and the fan running time as the basis for whether to perform overcurrent protection processing, which can effectively prevent the overcurrent protection mechanism from being triggered by mistake, ensure the normal use of the gas water heater, and improve the user experience.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas water heaters, and particularly to a method and device for overcurrent protection of a gas water heater and the gas water heater. BACKGROUND

[0002] As a common household appliance in people's daily life, the gas water heater usually uses a fan to clean and then uses a striking needle on a fan drive board connected to the fan to ignite natural gas. Then, the water is heated based on the heat provided by the gas combustion to provide hot water to the user.

[0003] When the gas water heater relies on high-voltage electronic ignition needle discharge to ignite, the voltage released is relatively large, the discharge time is relatively short, the instantaneous energy impact is relatively large, and the fan drive board is easily disturbed by electromagnetic and static electricity, so that the current value on the fan drive board reaches a peak current value, thereby causing a false overcurrent protection failure phenomenon, causing the machine to stop and affecting normal use by the user.

[0004] In the prior art, in order to prevent false triggering of the overcurrent protection mechanism, the peak current threshold and the judgment time value of the peak current can be increased to accurately determine whether the current on the fan drive board has reached the peak current value. However, due to different models and internal components of the gas water heater from different manufacturers, it is difficult to control the peak current threshold and the time when the peak current appears, which can easily cause damage to the fan drive board and even cause an explosion. SUMMARY

[0005] The present application provides a method and device for overcurrent protection of a gas water heater and the gas water heater to solve the problem that the prior art cannot accurately determine whether an overcurrent phenomenon exists on the fan drive board of the gas water heater, which causes false triggering or delayed false triggering of the overcurrent protection mechanism.

[0006] In a first aspect, the present application provides a method for overcurrent protection of a gas water heater, comprising:

[0007] When it is detected that the ignition needle of the gas water heater ignites, detecting the current on the fan drive board;

[0008] If the current is greater than or equal to a preset peak current threshold, it is determined that the current on the fan drive board is overcurrent, and a counter is triggered to add 1 to the overcurrent number;

[0009] If the current overcurrent number recorded on the counter is greater than or equal to a preset overcurrent number threshold, the PWM is controlled to be closed;

[0010] It is determined that an overcurrent protection failure occurs, and the gas water heater is shut down.

[0011] In an alternative embodiment, the detection method further comprises:

[0012] if the current current is less than the preset peak current threshold, obtaining the running time of the fan;

[0013] determining whether the running time is greater than or equal to a preset running time threshold;

[0014] if the running time is greater than or equal to the preset running time threshold, triggering the counter to perform a minus 1 processing on the current overcurrent times, and continuing to detect the current current on the fan drive board.

[0015] In an alternative embodiment, the detection method further comprises:

[0016] if the running time is less than the preset running time threshold, continuing to detect the current current on the fan drive board;

[0017] In an alternative embodiment, the detection method further comprises:

[0018] if the current overcurrent times is less than the preset overcurrent times threshold, continuing to detect the current current on the fan drive board.

[0019] In a second aspect, the application provides a device for overcurrent protection of a gas water heater, comprising:

[0020] a detection module configured to detect a current current on a fan drive board when it is detected that an ignition needle of the gas water heater is ignited;

[0021] a processing module configured to, if the current current is greater than or equal to a preset peak current threshold, determine that the current current on the fan drive board is overcurrent, and trigger a counter to perform a plus 1 processing on overcurrent times;

[0022] the processing module is further configured to, if the current overcurrent times recorded on the counter is greater than or equal to a preset overcurrent times threshold, control a PWM to be closed, determine that an overcurrent protection failure occurs, and perform a shutdown processing on the gas water heater.

[0023] In an alternative embodiment, the processing module is further configured to, if the current current is less than the preset peak current threshold, obtain a running time of the fan, determine whether the running time is greater than or equal to a preset running time threshold, if the running time is greater than or equal to the preset running time threshold, trigger the counter to perform a minus 1 processing on the current overcurrent times, and continue to detect the current current on the fan drive board.

[0024] In an alternative embodiment, the processing module is further configured to continue to detect the current electric current on the fan drive board if the running time is less than the preset threshold of running time.

[0025] In an alternative embodiment, the processing module is further configured to continue to detect the current electric current on the fan drive board if the current overcurrent times is less than the preset threshold of overcurrent times.

[0026] In a third aspect, the present application provides a gas water heater, comprising: a gas water heater body, and a processor and a memory arranged in the gas water heater body.

[0027] The memory is configured to store executable instructions executable by the processor.

[0028] The processor is configured to execute the control method according to any one of the preceding aspects by executing the executable instructions.

[0029] In a fourth aspect, the present application provides a computer readable storage medium, wherein the computer readable storage medium stores computer execution instructions, and the computer execution instructions are configured to implement the method according to any one of the preceding aspects when executed by a processor.

[0030] The present application provides a method, device and gas water heater for overcurrent protection of a gas water heater. When it is detected that the ignition needle of the gas water heater is ignited, the current electric current on the fan drive board is detected. If the current electric current is greater than or equal to a preset threshold of sharp peak electric current, it is determined that the current electric current on the fan drive board is overcurrent, and a counter is triggered to add 1 to the overcurrent times. If the current overcurrent times recorded on the counter is greater than or equal to a preset threshold of overcurrent times, the PWM is closed. It is determined that an overcurrent protection failure occurs, and the gas water heater is shut down. Compared with the prior art, the present application can accurately determine whether the overcurrent phenomenon really exists based on the accumulation of the overcurrent times on the fan drive board and the running time of the fan, and thus the overcurrent protection processing is performed. The overcurrent protection mechanism can be effectively prevented from being triggered by mistake, so as to ensure the normal use of the gas water heater and improve the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0032] Figure 1 A flowchart of a method for overcurrent protection of a gas water heater provided by the present application is shown in the figure;

[0033] Figure 2A flowchart of another method for overcurrent protection of a gas water heater provided in the present application is shown in the figure;

[0034] Figure 3 A flowchart of another method for overcurrent protection of a gas water heater provided in the present application is shown in the figure;

[0035] Figure 4 A schematic diagram of a device structure for overcurrent protection of a gas water heater provided in the present application is shown in the figure. DETAILED DESCRIPTION

[0036] The exemplary embodiments will be described in detail herein with reference to the accompanying drawings. In the following description, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they only describe examples of devices and methods consistent with some aspects of the present application, as detailed in the appended claims.

[0037] With the improvement of people's living standards, water heater products have become an essential household appliance in people's daily life, and gas water heaters are also a common household water heater in daily life. As a core component of the gas water heater, the fan plays a crucial role in the operation of the gas water heater.

[0038] Currently, when the ignition needle inside the gas water heater ignites, the gas water heater relies on high-voltage electronic ignition needle discharge to ignite. Since the voltage released when the ignition needle ignites is relatively large, the discharge time is short, and the instantaneous energy impact is large, and the internal space of the product is limited and the structure is relatively compact, the input and output lines of the fan drive board are close to the ignition needle. Under the influence of electromagnetic and static interference, the current value on the drive board reaches a false peak current value, causing an overcurrent protection failure and causing the machine to shut down. However, it is difficult to find in actual testing that the overcurrent caused by the ignition is too large, and it is also difficult to measure the size of the peak current when the overcurrent occurs, making it difficult to solve the fault.

[0039] Currently, to solve the problem of false triggering of the overcurrent protection mechanism caused by electromagnetic and static interference when the gas water heater ignites, the size of the peak current is increased under the premise that the power device will not be damaged due to heating; or the judgment time of the overcurrent protection failure is increased while the size of the peak current is kept unchanged, so as to avoid the problem of false triggering of the overcurrent protection mechanism caused by interference; or both the size of the peak current and the judgment time of the overcurrent protection failure are increased, so as to accurately judge whether the overcurrent protection failure has really occurred.

[0040] However, due to the different manufacturers of the ignition needle and the fan drive board in the gas water heater and the different installation environments of the gas water heater, it is difficult to control the standard of the peak current value and the judgment time of the overcurrent protection failure. That is, when the peak current value and the judgment time of the overcurrent protection failure are set to be large, the real overcurrent protection failure may be ignored, which may cause the fan drive board of the gas water heater to be burned out, or even cause the fan drive board to catch fire and explode.

[0041] Based on the above technical problems, the present application is to confirm the overcurrent protection failure by accumulating the number of overcurrent times and the normal operation time of the fan, and to perform corresponding processing according to the confirmation result, so as to prevent the overcurrent protection mechanism from being triggered by mistake.

[0042] Example One

[0043] Figure 1 A flowchart of a method for overcurrent protection of a gas water heater is provided in the present application. As shown in Figure 1 The overcurrent protection method includes:

[0044] Step 101, when it is monitored that the ignition needle of the gas water heater ignites, the current on the fan drive board is detected.

[0045] In this embodiment, when the gas water heater is turned on and waits for start, the fan needs to be started first to perform cleaning work, so as to clean the residual gas, dust and the like, and then the high-voltage ignition is controlled to start discharge to ground, so as to ignite the gas to heat the water.

[0046] Specifically, the fan drive board has current passing through when the gas water heater is turned on, but the voltage generated by the ignition needle when igniting can reach more than 10,000 volts. In a limited space and time, the huge energy can cause the current value on the fan drive board adjacent to the ignition needle to increase sharply, and the sharply increased current value can easily cause the components on the fan drive board to be burned out. Therefore, when it is monitored that the ignition needle ignites, the current value on the fan drive board needs to be detected to ensure the safety of the gas water heater.

[0047] Step 102, if the current is greater than or equal to a preset peak current threshold, it is determined that the current on the fan drive board is overcurrent, and a counter is triggered to perform a plus 1 processing on the number of overcurrent times.

[0048] In this embodiment, the gas water heater has a preset peak current threshold, which is used as a basis for judging the overcurrent protection failure. The peak current threshold is obtained by personnel through experiments on different types of gas water heaters, but this embodiment is not limited to this implementation.

[0049] After detecting the current current value on the fan drive board, the current current value is compared with the peak current threshold value of the current gas water heater. When the current current value is greater than or equal to the preset peak current threshold value, it indicates that the current on the fan drive board has exceeded the current range in the safe state, and the fan drive has a damage problem.

[0050] Since the current current value on the fan drive board may be greater than or equal to the preset peak current threshold value due to other reasons, the embodiment accumulates the case that the current current value is greater than or equal to the preset peak current threshold value by using a counter, that is, the counter is triggered to perform a plus 1 operation once for each occurrence of the aforementioned case, to further confirm the reason for the occurrence of the case that the current current value on the fan drive board reaches the preset peak current threshold value.

[0051] That is, in the case that it cannot be excluded that the current current value on the fan drive board reaches or exceeds the preset peak current threshold value due to the ignition of the ignition needle, the number of overcurrents is temporarily accumulated, and then step 103 is used to further confirm whether the overcurrent protection failure actually occurs.

[0052] Step 103, if the current overcurrent number recorded on the counter is greater than or equal to the preset overcurrent number threshold value, the pulse width modulation (Pulse width modulation; abbreviated as: PWM) is controlled to be closed.

[0053] Step 104, determine that the overcurrent protection failure occurs, and shut down the gas water heater.

[0054] Specifically, the accumulated value of the overcurrent number accumulated in the counter is obtained, and the accumulated value is compared with the overcurrent number threshold value stored in the gas water heater. If the accumulated value is greater than or equal to the overcurrent number threshold value, the PWM needs to be controlled to be closed for safety reasons, so that the fan of the gas water heater stops running, that is, the supply of oxygen required when the gas water heater burns gas is blocked, so that the gas in the gas water heater no longer burns, to protect the safety of the gas water heater and the user.

[0055] Further, the gas water heater also needs to further confirm the aforementioned case that the current current value is greater than or equal to the preset overcurrent number threshold value, that is, to confirm that the gas water heater actually has an overcurrent protection failure, and needs to be shut down to protect the safety of the gas water heater and the user.

[0056] In the embodiment, a method for over-current protection of a gas water heater is provided. The current on the fan drive board is detected when it is monitored that the ignition needle of the gas water heater ignites; if the current is greater than or equal to a preset peak current threshold, it is determined that the current on the fan drive board is over-current, and a counter is triggered to process the over-current times by 1; if the current over-current times recorded on the counter are greater than or equal to a preset over-current times threshold, the PWM is controlled to be closed; it is confirmed that the over-current protection fault occurs, and the gas water heater is shut down. Compared with the prior art, the application can increase the probability of confirming the over-current protection fault based on the accumulation of the over-current times on the fan drive board, rather than relying on the over-current phenomenon to determine that there is an over-current protection fault. At the same time, under the condition of meeting the preset over-current times threshold, the fan is first suspended, and then locked as an over-current protection fault, and then the gas water heater is shut down, which temporarily suspends the fan operation when the fault cannot be confirmed, does not affect the use of the user, and immediately closes the gas water heater once the over-current protection fault is determined, so that the over-current protection fault is accurate and timely.

[0057] Example Two

[0058] Figure 2 Another flowchart of a method for over-current protection of a gas water heater is provided in the application. Based on the above-mentioned embodiment, the embodiment specifically describes how to protect the gas water heater from over-current in the case that the current value obtained is less than the preset peak current threshold, that is, as shown in Figure 2 After step 102, the method further includes:

[0059] Step 201, if the current is less than the preset peak current threshold, the running time of the fan is obtained.

[0060] In the embodiment, the huge energy generated by the ignition needle of the gas water heater when igniting may cause the current value on the fan drive board to increase sharply, and the instability of the energy may also cause the current value on the fan drive board to fluctuate. This causes that when the current value is detected to be less than the preset peak current threshold, it cannot be completely guaranteed that there is no over-current protection fault at this time, therefore, the running time of the fan needs to be obtained to further confirm whether the gas water heater truly has an over-current protection fault.

[0061] It should be noted that if there is no start-up fault in the start-up process of the gas water heater, the fan of the gas water heater will also be in a normal running state, which can be reflected by the running time, for example, if the fan runs for 5s when the gas water heater starts, it indicates that the gas water heater has been started normally.

[0062] Step 202, judging whether the running time is greater than or equal to the preset running time threshold.

[0063] Step 203, if the running time is greater than or equal to the preset running time threshold, triggering the counter to reduce 1 from the current overcurrent times, and continuing to detect the current on the fan drive board.

[0064] Specifically, the gas water heater stores a preset running time threshold, which is used to judge whether the gas water heater is normally started, and the specific implementation mode includes but is not limited to: the experience setting of the technician.

[0065] More specifically, the running time of the fan of the gas water heater obtained is compared with the preset running time threshold, and if the fan running time is greater than or equal to the preset running time threshold, it indicates that there is no overcurrent protection failure in this monitoring process. The case that the current value obtained last time is greater than or equal to the preset peak current threshold is questionable, in order to accurately judge whether the current overcurrent protection failure problem exists, 1 overcurrent times should be reduced from the accumulated overcurrent times, that is, the counter is triggered to reduce 1, and the timer is triggered to clear 0, so as to facilitate the corresponding processing in the next monitoring.

[0066] In addition, although the above excludes the overcurrent protection failure problem, it is accidental, so it is still necessary to continue to monitor the current value of the fan drive board, and then process according to the foregoing method of overcurrent protection for the gas water heater, which is not repeated here.

[0067] In this embodiment, considering the case that the detected current value is less than the preset peak current threshold, by acquiring the running time of the fan, judging whether the running time is greater than or equal to the preset running time threshold, if the running time is greater than or equal to the preset running time threshold, triggering the counter to reduce 1 from the current overcurrent times, and continuing to detect the current on the fan drive board. The method further confirms whether there is an overcurrent protection failure problem. This makes the overcurrent protection of the gas water heater more accurate and effective.

[0068] Example Three

[0069] Figure 3 Another flowchart of the method of overcurrent protection for the gas water heater provided in the present application is shown. As shown in Figure 3 The method of overcurrent protection further includes:

[0070] Step 301, detecting the current on the fan drive board when the ignition needle of the gas water heater is monitored to ignite.

[0071] Step 302, if the current is less than the preset peak current threshold, the running time of the fan is obtained.

[0072] Specifically, when the monitored current value on the fan drive board is less than the preset peak current threshold, it indicates that there is no overcurrent protection failure problem in this monitoring, i.e., the gas water heater is likely to be in a normal start state, and accordingly, the fan is likely to be in a normal running state, which is mapped to the running time of the fan reaching or exceeding the running time threshold. However, in this case, there is also a possibility that the fan is not in a normal running state. Based on this, step 303 needs to be continued to determine the relationship between the running time and the preset running time threshold.

[0073] Step 303, determining whether the running time is greater than or equal to the preset running time threshold, if yes, executing step 304, if no, executing step 305.

[0074] Specifically, the relationship between the obtained running time and the preset running time threshold is determined to further confirm whether there is an overcurrent protection failure.

[0075] Step 304, triggering the counter to perform a minus 1 processing on the current overcurrent times, and continuing to detect the current on the fan drive board.

[0076] In this embodiment, step 304 is the same as step 203 in embodiment two, which will not be repeated here.

[0077] Step 305, continuing to detect the current on the fan drive board.

[0078] Specifically, when it is determined that the obtained running time of the fan is less than the preset running time threshold, it indicates that the fan is not in a normal running state, i.e., the gas water heater is likely to be in a normal start state. Considering that this situation may exist due to inaccurate monitoring of the current value or the running time of the fan, it is an accidental event. In order to avoid such accidental events, the current on the fan drive board needs to be further monitored, and then the method provided in the foregoing embodiment one and embodiment two is used to further determine, which will not be repeated here.

[0079] Based on this, the embodiment provides a specific processing method for determining whether there is a real overcurrent protection failure when the running time of the fan is less than the preset running time threshold, which makes the overcurrent protection method for the gas water heater more specific and perfect, and also improves the accuracy of the overcurrent protection failure confirmation.

[0080] Optionally, on the basis of the foregoing embodiment, if the current overcurrent count is less than the preset overcurrent count threshold, the current current on the fan drive plate is continuously detected. This specifically describes a specific method for overcurrent protection of the gas water heater when the current overcurrent count is less than the preset overcurrent count threshold.

[0081] Specifically, before determining the relationship between the current overcurrent count and the preset overcurrent count, it has been determined that the current current on the fan drive plate is greater than or equal to the preset peak current threshold, which indicates that there may be an overcurrent protection failure problem. Even if the current overcurrent protection count is less than the preset overcurrent count threshold, in order to accurately determine whether there is an overcurrent protection failure problem, the fan of the gas water heater needs to be restarted, that is, the PWM needs to be restarted, so as to detect the current value on the fan drive plate again to confirm whether there is an overcurrent protection failure problem.

[0082] In this embodiment, specific steps are provided for how to perform overcurrent protection on the gas water heater when the current overcurrent count does not reach the preset overcurrent count threshold. This makes the overcurrent protection method for the gas water heater more comprehensive and accurate, and confirms each possible overcurrent protection failure problem to prevent false triggering of the overcurrent protection mechanism.

[0083] Example Four

[0084] Figure 4 A schematic diagram of a device structure for overcurrent protection of a gas water heater provided in the present application is shown in FIG. 1. Figure 4 As shown in FIG. 1, the device 40 includes a detection module 41 for detecting the current on the fan drive plate when it is detected that the ignition needle of the gas water heater is ignited; and a processing module 42 for processing, if the current is greater than or equal to the preset peak current threshold, determining that the current on the fan drive plate is overcurrent, and triggering the counter to perform a +1 processing on the overcurrent count; the processing module 42 is also used for, if the current overcurrent count recorded on the counter is greater than or equal to the preset overcurrent count threshold, controlling the PWM to be closed, determining that an overcurrent protection failure occurs, and performing a shutdown processing on the gas water heater.

[0085] Optionally, the processing module 42 is also used for, if the current is less than the preset peak current threshold, obtaining the running time of the fan, and determining whether the running time is greater than or equal to the preset running time threshold, if the running time is greater than or equal to the preset running time threshold, triggering the counter to perform a -1 processing on the current overcurrent count, and continuously detecting the current on the fan drive plate.

[0086] Optionally, the processing module 42 is further configured to continue to detect the current current on the fan drive board if the running time is less than the preset running time threshold.

[0087] Optionally, the processing module 42 is further configured to continue to detect the current current on the fan drive board if the current overcurrent times is less than the preset overcurrent times threshold.

[0088] The implementation principle of the device provided in the present application is similar to the manner in any of the above embodiments, and thus will not be described in detail.

[0089] In the present embodiment, a device for overcurrent protection of a gas water heater is provided. When it is detected that the ignition needle of the gas water heater is ignited, the current current on the fan drive board is detected. If the current current is greater than or equal to a preset peak current threshold, it is determined that the current current on the fan drive board is overcurrent, and a counter is triggered to perform a plus one processing on the overcurrent times. If the current overcurrent times recorded on the counter is greater than or equal to a preset overcurrent times threshold, the pulse width modulation (PWM) is controlled to be closed. It is confirmed that an overcurrent protection fault occurs, and the gas water heater is shut down. Compared with the prior art, the present application can increase the probability of confirming the overcurrent protection fault based on the accumulation of the overcurrent times on the fan drive board, rather than relying on only one overcurrent phenomenon to determine that there is an overcurrent protection fault. At the same time, when the preset overcurrent times threshold is met, the operation of the fan is first suspended, and then the overcurrent protection fault is locked, and the gas water heater is shut down. This makes a short-term suspension of the fan operation when the fault cannot be confirmed, which does not affect the use of the user. Once the overcurrent protection fault is determined, the gas water heater is immediately turned off, so that the overcurrent protection fault is accurate and timely.

[0090] In an alternative embodiment, a gas water heater is provided, which includes a gas water heater body, and a processor and a memory arranged in the gas water heater body; the memory is configured to store executable instructions executable by the processor; and the processor is configured to execute the method as mentioned in any of the above embodiments by executing the executable instructions.

[0091] In another alternative embodiment, a computer readable storage medium is provided, which stores computer execution instructions. When the computer execution instructions are executed by a processor, the computer execution instructions are configured to implement the method as mentioned in any of the above embodiments.

[0092] The above detailed description is merely descriptive of the application and specific embodiments thereof. It is not intended as a limitation on the scope of the application. Changes, equivalent substitutions, improvements, combinations, and the like, which are apparent to a skilled artisan, are covered by the following claims.

Claims

1. A method of overcurrent protection for a gas water heater, the method comprising: The method comprises the following steps: detecting the current current on the fan drive board when it is monitored that the ignition needle of the gas water heater is ignited; if the current current is greater than or equal to a preset peak current threshold, it is determined that the current current on the fan drive board is overcurrent, and a counter is triggered to add 1 to the overcurrent times; if the current overcurrent times recorded on the counter are greater than or equal to a preset overcurrent times threshold, the pulse width modulation (PWM) is controlled to be closed, so that the fan of the gas water heater stops running; it is determined that an overcurrent protection failure occurs, and the gas water heater is shut down; if the current current is less than the preset peak current threshold, the running time of the fan is obtained; it is judged whether the running time is greater than or equal to a preset running time threshold; if the running time is greater than or equal to the preset running time threshold, the counter is triggered to subtract 1 from the current overcurrent times, and the current current on the fan drive board is continuously detected.

2. The method of claim 1, wherein, Further comprising: if the running time is less than the preset running time threshold, the current current on the fan drive board is continuously detected.

3. The method of claim 1, wherein, Further comprising: if the current overcurrent times are less than the preset overcurrent times threshold, the current current on the fan drive board is continuously detected.

4. An overcurrent protection device for a gas water heater, comprising: The method comprises the following steps: a detection module is configured to detect the current current on the fan drive board when it is monitored that the ignition needle of the gas water heater is ignited; a processing module is configured to process the current current on the fan drive board when it is monitored that the ignition needle of the gas water heater is ignited; the processing module is further configured to control the PWM to be closed if the current current is greater than or equal to a preset peak current threshold, so that the fan of the gas water heater stops running; and determine that an overcurrent protection failure occurs, and shut down the gas water heater. the processing module is further configured to obtain the running time of the fan if the current current is less than the preset peak current threshold, and judge whether the running time is greater than or equal to a preset running time threshold; if the running time is greater than or equal to the preset running time threshold, the counter is triggered to subtract 1 from the current overcurrent times, and the current current on the fan drive board is continuously detected.

5. The apparatus of claim 4, wherein, the processing module is further configured to continuously detect the current current on the fan drive board if the running time is less than the preset running time threshold.

6. The apparatus of claim 4, wherein, the processing module is further configured to continuously detect the current current on the fan drive board if the current overcurrent times are less than the preset overcurrent times threshold.

7. A gas water heater, characterised by The method comprises the following steps: a gas water heater body, and a processor and a memory arranged in the gas water heater body; the memory is configured to store executable instructions executable by the processor; wherein the processor is configured to execute the method of any one of claims 1 to 3 by executing the executable instructions.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by the processor to implement the method of any one of claims 1 to 3.

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