Automatic water draining method for diesel filter and diesel filter

Abstract

This invention provides an automatic water draining method for a diesel fuel filter and a diesel fuel filter itself. The automatic water draining method for a diesel fuel filter includes: S1, acquiring the real-time water level of a first filter cup and a first preset drainage level; S2, determining whether the real-time water level of the first filter cup has reached the first preset drainage level; S3, when the real-time water level of the first filter cup reaches the first preset drainage level, draining water from the first filter cup to a second filter cup; S4, acquiring the real-time water level of the second filter cup and a second preset drainage level; S5, determining whether the real-time water level of the second filter cup has reached the second preset drainage level; S6, when the real-time water level of the second filter cup reaches the second preset drainage level, acquiring the real-time battery voltage and a preset voltage; S7, determining whether the real-time battery voltage is less than the preset voltage; S8, when the real-time battery voltage is less than the preset voltage, controlling the solenoid valve of the second filter cup to open for drainage.

Description

Technical Field

[0001] This invention relates to the field of filter technology, and more particularly to an automatic water draining method for a diesel filter and a diesel filter. Background Technology

[0002] Heavy-duty diesel engines currently use fuel containing a certain amount of water. During prolonged operation, this water accumulates in the diesel fuel filter. When it reaches a certain level, it affects the engine's performance, necessitating timely drainage of the water from the filter cup to ensure normal engine operation. Current technology uses sensors installed in the filter cup to indicate excessive water levels, prompting manual drainage. However, this technology has the drawback that if operators fail to heed the alarm and drain the water from the filter in time, engine performance will deteriorate, negatively impacting its overall performance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an automatic water draining method for a diesel filter and a diesel filter, which are in line with the shortcomings of the prior art.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: An automatic water draining method for a diesel filter, comprising: S1, acquiring the real-time water level of a first filter cup and a first preset drain level; S2, determining whether the real-time water level of the first filter cup has reached the first preset drain level; S3, when the real-time water level of the first filter cup reaches the first preset drain level, draining the water in the first filter cup to a second filter cup; S4, acquiring the real-time water level of the second filter cup and a second preset drain level; S5, determining whether the real-time water level of the second filter cup has reached the second preset drain level; S6, when the real-time water level of the second filter cup reaches the second preset drain level, acquiring the real-time battery voltage and a preset voltage; S7, determining whether the real-time battery voltage is less than the preset voltage; S8, when the real-time battery voltage is less than the preset voltage, controlling the solenoid valve of the second filter cup to open for drainage.

[0005] The beneficial effects of adopting the technical solution of this invention are as follows: By designing an automatic water draining method for diesel filters, excess water in the diesel engine filters can be automatically drained. The system automatically judges the vehicle's operating status and, under safe conditions, automatically drains water from the filters, improving automation, reducing manual labor, lowering user workload, and reducing power shortages caused by misoperation. When the water level discharged from the first filter cup reaches the second preset drainage level of the second filter cup, it indicates that drainage is needed. The controller collects the battery voltage; when the real-time battery voltage is lower than the preset voltage, it is considered that the diesel engine is not working, and the controller immediately opens the solenoid valve to drain the water.

[0006] Further, after step S3, the steps include: S31, obtaining the real-time water level of the second filter cup and the third preset drainage level; S32, determining whether the real-time water level of the second filter cup has reached the third preset drainage level; S33, when the real-time water level of the second filter cup reaches the third preset drainage level, obtaining the real-time battery voltage and the preset voltage; S34, determining whether the real-time battery voltage is greater than the preset voltage; S35, when the real-time battery voltage is greater than the preset voltage, controlling the solenoid valve of the second filter cup to open for drainage.

[0007] The beneficial effect of adopting the above-mentioned further technical solution is that when the real-time water level of the second filter cup reaches the third preset drainage level, and when the real-time battery voltage is greater than the preset voltage, drainage is performed immediately. This prevents the diesel engine performance from deteriorating due to failure to drain water from the filter in a timely manner, thus preventing any impact on the diesel engine's performance.

[0008] Further, after step S35, the steps include: S351, obtaining the real-time water level of the second filter cup and the fourth preset drainage level; S352, determining whether the real-time water level of the second filter cup is lower than the fourth preset drainage level; S353, when the real-time water level of the second filter cup is lower than the fourth preset drainage level, controlling the solenoid valve of the second filter cup to close and stop drainage.

[0009] The beneficial effects of adopting the above-mentioned further technical solution are as follows: when the real-time water level of the second filter cup is 20% lower than the second preset drainage level (fourth preset drainage level), drainage stops. Complete drainage is then performed when the real-time water level of the second filter cup reaches the second preset drainage level and the real-time battery voltage is lower than the preset voltage. This allows the drainage process to be carried out when the vehicle is not in operation, improving stability and reliability.

[0010] Furthermore, in steps S8 and S35, when the solenoid valve of the second filter cup is opened to drain water, it is determined whether the real-time water level of the second filter cup has dropped; when the real-time water level of the second filter cup has not dropped, an alarm message for blockage of the drain hole is output.

[0011] The beneficial effects of adopting the above-mentioned further technical solution are as follows: When the solenoid valve of the second filter cup is opened for drainage, if the drainage level does not drop, the controller immediately outputs a drainage hole blockage alarm, notifying the operator to clean the drainage hole. It automatically determines whether the drainage hole is blocked and promptly notifies the user to clear the blockage, improving the user experience.

[0012] Further, after step S7, the following steps are included: S71, when the real-time voltage of the battery is not less than the preset voltage, the solenoid valve of the second filter cup remains closed and does not drain water.

[0013] The beneficial effects of adopting the above-mentioned further technical solution are: when the real-time battery voltage is not less than the preset voltage, the diesel engine is considered to be working, the controller does not control the solenoid valve to open, and drainage is not performed at this time. This allows the drainage work to be carried out as much as possible when the vehicle is not running, improving stability and reliability.

[0014] Further, step S3 includes: when the real-time water level of the first filter cup reaches the first preset drainage level and the buoyancy of the one-way valve of the first filter cup reaches the preset buoyancy for opening the one-way valve, the one-way valve of the first filter cup opens to drain the water in the first filter cup to the second filter cup, wherein the one-way valve of the first filter cup is a buoyancy one-way valve.

[0015] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The internal opening switch of the one-way valve is opened through a buoyancy device. When the diesel engine is running continuously, when the water filtered from the diesel reaches the first preset drainage level of the first filter cup and the buoyancy of the one-way valve reaches the preset buoyancy for opening the one-way valve, the one-way valve opens, and the water stored in the first filter cup drains into the second filter cup. When the water level in the first filter cup drops and the first filter cup is full of diesel, the buoyancy of the one-way valve decreases, causing the one-way valve to close, preventing fuel leakage from the filter into the second filter cup. The buoyancy one-way valve ensures that water from the second filter cup does not flow back into the first filter cup.

[0016] Further, after step S4, the steps include: S41, determining whether the engine has a diesel pressure failure; S42, when the engine has a diesel pressure failure, controlling the solenoid valve of the second filter cup to open to drain water; S43, determining whether the real-time water level of the second filter cup is lower than the second preset drainage level; S44, when the real-time water level of the second filter cup is lower than the second preset drainage level, controlling the solenoid valve of the second filter cup to close to stop draining water.

[0017] The beneficial effects of adopting the above-mentioned further technical solution are: when the engine experiences a diesel pressure-related fault, the solenoid valve is controlled to perform a drainage operation; when the water level in the second filter cup is significantly lower than the second preset drainage level, the drainage operation stops. The solenoid valve automatically closes, improving stability and reliability.

[0018] Furthermore, the preset voltage is 13V or 25V.

[0019] The beneficial effect of adopting the above-mentioned further technical solutions is that the voltage is set according to the vehicle power supply system, thus expanding the scope of application.

[0020] Furthermore, the present invention also provides a diesel filter for implementing an automatic water draining method for a diesel filter as described in any of the above claims. The diesel filter includes: a first filter cup, a second filter cup, a solenoid valve, and a controller. The first filter cup is provided with a first drain hole, and the second filter cup is provided with a water inlet and a second drain hole. The first drain hole of the first filter cup is connected to the water inlet of the second filter cup. The solenoid valve is installed at the second drain hole of the second filter cup. The first filter cup is provided with a first water level sensor, and the second filter cup is provided with a second water level sensor. The first water level sensor, the second water level sensor, and the solenoid valve are all connected to the controller.

[0021] The beneficial effects of adopting the technical solution of this invention are as follows: the first drain hole of the first filter cup is connected to the inlet of the second filter cup, and the water stored in the first filter cup is drained into the second filter cup. It requires minimal additional hardware configuration to the vehicle, and most signals can be reused from the original vehicle configuration, resulting in low cost. By designing a diesel filter with an automatic water draining function, excess water in the diesel engine filter can be automatically drained, the vehicle's operating status can be automatically determined, and water can be automatically drained from the filter under safe conditions, improving automation, reducing manual labor, lowering user workload, and reducing power shortage malfunctions caused by misoperation. When the water level discharged from the first filter cup reaches the second preset drain level of the second filter cup, it indicates that drainage is required. The controller collects the battery voltage; when the real-time battery voltage is lower than the preset voltage, it is considered that the diesel engine is not working, and the controller controls the solenoid valve to open immediately for drainage.

[0022] Furthermore, the first filter cup is provided with a water storage cup and a buoyancy one-way valve. The water storage cup is connected to the first drain hole of the first filter cup, and the buoyancy one-way valve is installed at the first drain hole of the first filter cup. The controller is connected to a voltage sensor and an alarm device, and the voltage sensor is connected to a battery.

[0023] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The internal opening switch of the one-way valve is opened through a buoyancy device. When the diesel engine is running continuously, when the water filtered from the diesel reaches the first preset drainage level of the first filter cup and the buoyancy of the one-way valve reaches the preset buoyancy for opening the one-way valve, the one-way valve opens, and the water stored in the first filter cup drains into the second filter cup. When the water level in the first filter cup drops and the first filter cup is full of diesel, the buoyancy of the one-way valve decreases, causing the one-way valve to close, preventing fuel leakage from the filter into the second filter cup. The buoyancy one-way valve ensures that water from the second filter cup does not flow back into the first filter cup.

[0024] The advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] Figure 1 This is one of the schematic flowcharts of an automatic water draining method for a diesel filter provided in an embodiment of the present invention.

[0026] Figure 2 This is the second schematic flowchart of an automatic water draining method for a diesel filter provided in an embodiment of the present invention. Detailed Implementation

[0027] The principles and features of the present invention are described below with reference to the accompanying drawings. The embodiments described are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0028] like Figure 1 As shown, this embodiment of the invention provides an automatic water draining method for a diesel filter, including: S1, acquiring the real-time water level of a first filter cup and a first preset drainage level; S2, determining whether the real-time water level of the first filter cup has reached the first preset drainage level; S3, when the real-time water level of the first filter cup reaches the first preset drainage level, draining the water in the first filter cup to a second filter cup; S4, acquiring the real-time water level of the second filter cup and a second preset drainage level; S5, determining whether the real-time water level of the second filter cup has reached the second preset drainage level; S6, when the real-time water level of the second filter cup reaches the second preset drainage level, acquiring the real-time battery voltage and a preset voltage; S7, determining whether the real-time battery voltage is less than the preset voltage; S8, when the real-time battery voltage is less than the preset voltage, controlling the solenoid valve of the second filter cup to open for drainage.

[0029] The beneficial effects of adopting the technical solution of this invention are as follows: By designing an automatic water draining method for diesel filters, excess water in the diesel engine filters can be automatically drained. The system automatically judges the vehicle's operating status and, under safe conditions, automatically drains water from the filters, improving automation, reducing manual labor, lowering user workload, and reducing power shortages caused by misoperation. When the water level discharged from the first filter cup reaches the second preset drainage level of the second filter cup, it indicates that drainage is needed. The controller collects the battery voltage; when the real-time battery voltage is lower than the preset voltage, it is considered that the diesel engine is not working, and the controller immediately opens the solenoid valve to drain the water.

[0030] like Figure 2 As shown, 1. Determine if the first filter cup has reached the water discharge level (first preset drainage level); 2. If yes, determine if the second filter cup has reached the water discharge level (second preset drainage level); 3. If yes, the controller determines if the battery voltage (real-time battery voltage) is greater than the set value (preset voltage); 4. If no, open the solenoid valve to discharge water; 5. Determine if the water level in the second filter cup has decreased; 6. If no, report that the drain outlet (drain hole) is blocked.

[0031] If not after step 1, return to step 1.

[0032] If not after step 2, return to step 2.

[0033] After step 3, if so, do not add water.

[0034] After step 5, if so, the alarm position is not activated (no alarm).

[0035] Further, after step S3, the steps include: S31, obtaining the real-time water level of the second filter cup and the third preset drainage level; S32, determining whether the real-time water level of the second filter cup has reached the third preset drainage level; S33, when the real-time water level of the second filter cup reaches the third preset drainage level, obtaining the real-time battery voltage and the preset voltage; S34, determining whether the real-time battery voltage is greater than the preset voltage; S35, when the real-time battery voltage is greater than the preset voltage, controlling the solenoid valve of the second filter cup to open for drainage.

[0036] The beneficial effect of adopting the above-mentioned further technical solution is that when the real-time water level of the second filter cup reaches the third preset drainage level, and when the real-time battery voltage is greater than the preset voltage, drainage is performed immediately. This prevents the diesel engine performance from deteriorating due to failure to drain water from the filter in a timely manner, thus preventing any impact on the diesel engine's performance.

[0037] The third preset drainage level can be greater than the second preset drainage level.

[0038] Further, after step S35, the steps include: S351, obtaining the real-time water level of the second filter cup and the fourth preset drainage level; S352, determining whether the real-time water level of the second filter cup is lower than the fourth preset drainage level; S353, when the real-time water level of the second filter cup is lower than the fourth preset drainage level, controlling the solenoid valve of the second filter cup to close and stop drainage.

[0039] The beneficial effects of adopting the above-mentioned further technical solution are as follows: when the real-time water level of the second filter cup is 20% lower than the second preset drainage level (fourth preset drainage level), drainage stops. Complete drainage is then performed when the real-time water level of the second filter cup reaches the second preset drainage level and the real-time battery voltage is lower than the preset voltage. This allows the drainage process to be carried out when the vehicle is not in operation, improving stability and reliability.

[0040] The fourth preset drainage level can be 20% of the second preset drainage level.

[0041] Furthermore, in steps S8 and S35, when the solenoid valve of the second filter cup is opened to drain water, it is determined whether the real-time water level of the second filter cup has dropped; when the real-time water level of the second filter cup has not dropped, an alarm message for blockage of the drain hole is output.

[0042] The beneficial effects of adopting the above-mentioned further technical solution are as follows: When the solenoid valve of the second filter cup is opened for drainage, if the drainage level does not drop, the controller immediately outputs a drainage hole blockage alarm, notifying the operator to clean the drainage hole. It automatically determines whether the drainage hole is blocked and promptly notifies the user to clear the blockage, improving the user experience.

[0043] Further, after step S7, the following steps are included: S71, when the real-time voltage of the battery is not less than the preset voltage, the solenoid valve of the second filter cup remains closed and does not drain water.

[0044] The beneficial effects of adopting the above-mentioned further technical solution are: when the real-time battery voltage is not less than the preset voltage, the diesel engine is considered to be working, the controller does not control the solenoid valve to open, and drainage is not performed at this time. This allows the drainage work to be carried out as much as possible when the vehicle is not running, improving stability and reliability.

[0045] Further, step S3 includes: when the real-time water level of the first filter cup reaches the first preset drainage level and the buoyancy of the one-way valve of the first filter cup reaches the preset buoyancy for opening the one-way valve, the one-way valve of the first filter cup opens to drain the water in the first filter cup to the second filter cup, wherein the one-way valve of the first filter cup is a buoyancy one-way valve.

[0046] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The internal opening switch of the one-way valve is opened through a buoyancy device. When the diesel engine is running continuously, when the water filtered from the diesel reaches the first preset drainage level of the first filter cup and the buoyancy of the one-way valve reaches the preset buoyancy for opening the one-way valve, the one-way valve opens, and the water stored in the first filter cup drains into the second filter cup. When the water level in the first filter cup drops and the first filter cup is full of diesel, the buoyancy of the one-way valve decreases, causing the one-way valve to close, preventing fuel leakage from the filter into the second filter cup. The buoyancy one-way valve ensures that water from the second filter cup does not flow back into the first filter cup.

[0047] Further, after step S4, the steps include: S41, determining whether the engine has a diesel pressure failure; S42, when the engine has a diesel pressure failure, controlling the solenoid valve of the second filter cup to open to drain water; S43, determining whether the real-time water level of the second filter cup is lower than the second preset drainage level; S44, when the real-time water level of the second filter cup is lower than the second preset drainage level, controlling the solenoid valve of the second filter cup to close to stop draining water.

[0048] The beneficial effects of adopting the above-mentioned further technical solution are: when the engine experiences a diesel pressure-related fault, the solenoid valve is controlled to perform a drainage operation; when the water level in the second filter cup is significantly lower than the second preset drainage level, the drainage operation stops. The solenoid valve automatically closes, improving stability and reliability.

[0049] Furthermore, the preset voltage is 13V or 25V.

[0050] The beneficial effect of adopting the above-mentioned further technical solutions is that the voltage is set according to the vehicle power supply system, thus expanding the scope of application.

[0051] The present invention provides an automatic water draining method for a diesel filter, which can automatically drain excess water from the diesel engine filter. The diesel filter provided in this embodiment can automatically drain excess water from the diesel engine filter. The diesel filter may include: dual filter cups (first filter cup and second filter cup), a one-way valve device (one-way valve or buoyancy one-way valve), a solenoid valve, a controller, and other devices.

[0052] Working principle:

[0053] The diesel filter structure consists of a first filter cup and a second filter cup. The drain hole of the first filter cup (first drain hole) is connected to the inlet of the second filter cup. The water stored in the first filter cup is drained into the second filter cup.

[0054] The drainage principle of the first filter cup:

[0055] The first filter cup consists of a water storage cup and a buoyancy check valve. The check valve's internal opening switch is activated by a buoyancy device. When the diesel engine is running continuously, when the water filtered from the diesel reaches the set drainage level (first preset drainage level) of the first filter cup and the buoyancy of the check valve reaches the preset buoyancy required for it to open, the check valve opens, draining the water stored in the first filter cup into the second filter cup. When the water level in the first filter cup drops and diesel fills it, the buoyancy of the check valve decreases, causing it to close, preventing fuel leakage from the filter into the second filter cup. The buoyancy check valve ensures that water from the second filter cup does not flow back into the first filter cup.

[0056] The drainage principle of the second filter cup

[0057] The second filter cup consists of a water reservoir and a solenoid valve. When the water level discharged from the first filter cup reaches the first drainage level (second preset drainage level) of the second filter cup, drainage is required. The controller collects the battery voltage (real-time battery voltage). When the voltage is <13 or 25V (preset voltage, set according to the vehicle's power supply system), it is assumed that the diesel engine is not running, and the controller controls the solenoid valve to open immediately for drainage. When the voltage is >13 or 25V (preset voltage, set according to the vehicle's power supply system), it is assumed that the diesel engine is running, and the controller does not control the solenoid valve to open; drainage does not occur at this time. When the water level in the second filter cup reaches the second alarm water level (third preset drainage level), and when the voltage is >13 or 25V (preset voltage, set according to the vehicle's power supply system), drainage begins immediately. When the water level is 20% lower than the first alarm water level (second preset drainage level) (fourth preset drainage level), drainage stops. Wait for the water level (real-time water level of the second filter cup) to reach the first alarm water level (second preset drainage level) and when the voltage is <13 or 25V (preset voltage, the preset voltage is set according to the vehicle power supply system) to completely drain the water.

[0058] Drain blockage alarm

[0059] When the solenoid valve of the second filter cup is opened to drain water, if the drain level does not drop, the controller will immediately output a drain hole blockage alarm to notify the operator to clean the drain hole.

[0060] When the engine experiences a diesel pressure-related fault, the drain solenoid valve (the solenoid valve of the second filter cup) is controlled to drain the water. When the water level in the second filter cup (the real-time water level of the second filter cup) is far below the alarm water level (the second preset drain level), the draining operation is stopped.

[0061] As an alternative to the aforementioned automatic drainage control, users can manually check and drain water, or perform corresponding manual drainage work according to the controller's prompts.

[0062] It automatically determines the vehicle's operating status and, when safe to do so, automatically drains water from the fuel filter, reducing manual labor and extending the draining time of the working filter. Through multiple condition assessments, the draining of the coarse filter cup is transitioned from manual to intelligent automation, maximizing the inter-vehicle running time. This reduces power loss malfunctions caused by operational errors. It requires minimal additional vehicle hardware, and most signals can be reused from the original vehicle configuration, resulting in low cost.

[0063] Furthermore, the present invention also provides a diesel filter for implementing an automatic water draining method for a diesel filter as described in any of the above claims. The diesel filter includes: a first filter cup, a second filter cup, a solenoid valve, and a controller. The first filter cup is provided with a first drain hole, and the second filter cup is provided with a water inlet and a second drain hole. The first drain hole of the first filter cup is connected to the water inlet of the second filter cup. The solenoid valve is installed at the second drain hole of the second filter cup. The first filter cup is provided with a first water level sensor, and the second filter cup is provided with a second water level sensor. The first water level sensor, the second water level sensor, and the solenoid valve are all connected to the controller.

[0064] The beneficial effects of adopting the technical solution of this invention are as follows: the first drain hole of the first filter cup is connected to the inlet of the second filter cup, and the water stored in the first filter cup is drained into the second filter cup. It requires minimal additional hardware configuration to the vehicle, and most signals can be reused from the original vehicle configuration, resulting in low cost. By designing a diesel filter with an automatic water draining function, excess water in the diesel engine filter can be automatically drained, the vehicle's operating status can be automatically determined, and water can be automatically drained from the filter under safe conditions, improving automation, reducing manual labor, lowering user workload, and reducing power shortage malfunctions caused by misoperation. When the water level discharged from the first filter cup reaches the second preset drain level of the second filter cup, it indicates that drainage is required. The controller collects the battery voltage; when the real-time battery voltage is lower than the preset voltage, it is considered that the diesel engine is not working, and the controller controls the solenoid valve to open immediately for drainage.

[0065] Furthermore, the first filter cup is provided with a water storage cup and a buoyancy one-way valve. The water storage cup is connected to the first drain hole of the first filter cup, and the buoyancy one-way valve is installed at the first drain hole of the first filter cup. The controller is connected to a voltage sensor and an alarm device, and the voltage sensor is connected to a battery.

[0066] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The internal opening switch of the one-way valve is opened through a buoyancy device. When the diesel engine is running continuously, when the water filtered from the diesel reaches the first preset drainage level of the first filter cup and the buoyancy of the one-way valve reaches the preset buoyancy for opening the one-way valve, the one-way valve opens, and the water stored in the first filter cup drains into the second filter cup. When the water level in the first filter cup drops and the first filter cup is full of diesel, the buoyancy of the one-way valve decreases, causing the one-way valve to close, preventing fuel leakage from the filter into the second filter cup. The buoyancy one-way valve ensures that water from the second filter cup does not flow back into the first filter cup.

[0067] Among them, alarm devices can include buzzers, alarm lights, alarm displays, etc.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic water draining method for a diesel filter, characterized in that, include: S1. Obtain the real-time water level of the first filter cup and the first preset drainage level; S2. Determine whether the real-time water level of the first filter cup has reached the first preset drainage level; S3. When the real-time water level of the first filter cup reaches the first preset drainage level, the water in the first filter cup is drained to the second filter cup. S4. Obtain the real-time water level of the second filter cup and the second preset drainage level; S5. Determine whether the real-time water level of the second filter cup has reached the second preset drainage level; S6. When the real-time water level of the second filter cup reaches the second preset drainage level, obtain the real-time battery voltage and the preset voltage. S7. Determine if the real-time battery voltage is lower than the preset voltage; S8. When the real-time voltage of the battery is lower than the preset voltage, control the solenoid valve of the second filter cup to open for drainage. Step S3 is followed by: S31. Obtain the real-time water level of the second filter cup and the third preset drainage level; wherein the third preset drainage level is greater than the second preset drainage level; S32. Determine whether the real-time water level of the second filter cup has reached the third preset drainage level; S33. When the real-time water level of the second filter cup reaches the third preset drainage level, obtain the real-time battery voltage and the preset voltage. S34. Determine whether the real-time battery voltage is greater than the preset voltage; S35. When the real-time voltage of the battery is greater than the preset voltage, control the solenoid valve of the second filter cup to open and drain water.

2. The automatic water draining method for a diesel filter according to claim 1, characterized in that, Step S35 and the following steps include: S351, Obtain the real-time water level of the second filter cup and the fourth preset drainage level; S352. Determine whether the real-time water level of the second filter cup is lower than the fourth preset drainage level; S353. When the real-time water level of the second filter cup is lower than the fourth preset drainage level, the solenoid valve of the second filter cup is closed to stop drainage.

3. The automatic water draining method for a diesel filter according to claim 1, characterized in that, In steps S8 and S35, when the solenoid valve of the second filter cup is opened to drain water, it is determined whether the real-time water level of the second filter cup has dropped. If the real-time water level of the second filter cup does not drop, an alarm message will be displayed indicating that the drain hole is blocked.

4. The automatic water draining method for a diesel filter according to claim 1, characterized in that, Step S7 is followed by: S71, when the real-time voltage of the battery is not less than the preset voltage, the solenoid valve of the second filter cup remains closed and does not drain.

5. The automatic water draining method for a diesel filter according to claim 1, characterized in that, Step S3 includes: when the real-time water level of the first filter cup reaches the first preset drainage level and the buoyancy of the one-way valve of the first filter cup reaches the preset buoyancy for opening the one-way valve, the one-way valve of the first filter cup opens to drain the water in the first filter cup to the second filter cup, wherein the one-way valve of the first filter cup is a buoyancy one-way valve.

6. The automatic water draining method for a diesel filter according to claim 1, characterized in that, Step S4 is followed by: S41. Determine if the engine has a diesel pressure fault. S42. When the engine experiences a diesel pressure failure, the solenoid valve controlling the second filter cup opens to drain the water. S43. Determine whether the real-time water level of the second filter cup is lower than the second preset drainage level; S44. When the real-time water level of the second filter cup is lower than the second preset drainage level, the solenoid valve of the second filter cup is closed to stop drainage.

7. The automatic water draining method for a diesel filter according to claim 1, characterized in that, The preset voltage is 13V or 25V.

8. A diesel fuel filter, characterized in that, An automatic water draining method for a diesel filter according to any one of claims 1 to 7 is provided. The diesel filter includes: a first filter cup, a second filter cup, a solenoid valve, and a controller. The first filter cup is provided with a first drain hole, and the second filter cup is provided with a water inlet and a second drain hole. The first drain hole of the first filter cup is connected to the water inlet of the second filter cup. The solenoid valve is installed at the second drain hole of the second filter cup. The first filter cup is provided with a first water level sensor, and the second filter cup is provided with a second water level sensor. The first water level sensor, the second water level sensor, and the solenoid valve are all connected to the controller.

9. A diesel filter according to claim 8, characterized in that, The first filter cup is equipped with a water storage cup and a buoyancy one-way valve. The water storage cup is connected to the first drain hole of the first filter cup. The buoyancy one-way valve is installed at the first drain hole of the first filter cup. The controller is connected to a voltage sensor and an alarm device. The voltage sensor is connected to a battery.

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