Method and system for diagnosing a fault of a diesel engine oil filter

Abstract

The present application relates to a kind of diesel engine oil filter fault diagnosis method and system, method includes: in based on the rotational speed of engine, in the case where the rotational speed meets preset condition, obtain the pressure before oil filter and main oil passage pressure in preset time period;Based on the pressure before oil filter and the main oil passage pressure, determine filter before and after pressure difference and filter before and after pressure difference change rate;Based on the filter before and after pressure difference, main oil passage pressure and filter before and after pressure difference change rate, determine whether oil filter needs to be cleaned;In the case where determining that oil filter needs to be cleaned, send the alarm that oil filter needs to be cleaned.Based on this, accurate filter fault diagnosis is implemented.

Description

Technical Field

[0001] This invention relates to the field of oil filters, and in particular to a method and system for diagnosing faults in diesel engine oil filters. Background Technology

[0002] During the use of a diesel engine, as it travels long distances over a long period of time, impurities gradually increase in the oil lines, causing the oil filter to gradually increase its resistance. If not maintained and repaired in time, this can lead to serious malfunctions in the diesel engine.

[0003] Currently, differential pressure alarms are typically used because a simple differential pressure alarm cannot accurately determine whether the oil filter needs cleaning. Therefore, manual inspection and judgment are required to determine whether the diesel engine oil filter needs cleaning.

[0004] Therefore, how to accurately diagnose filter faults is an urgent problem to be solved. Summary of the Invention

[0005] This invention provides a method and system for diagnosing diesel engine oil filter faults, which solves the problem that the prior art cannot accurately diagnose filter faults, and achieves accurate filter fault diagnosis.

[0006] A method for diagnosing a diesel engine oil filter fault includes: based on the engine speed and assuming the speed meets preset conditions, acquiring the oil filter inlet pressure and main oil passage pressure within a preset time period; based on the oil filter inlet pressure and the main oil passage pressure, determining the pressure difference across the filter and the rate of change of the pressure difference across the filter; based on the pressure difference across the filter, the main oil passage pressure, and the rate of change of the pressure difference across the filter, determining whether the oil filter needs to be cleaned; and if it is determined that the oil filter needs to be cleaned, issuing an alarm indicating that the oil filter needs to be cleaned.

[0007] In one embodiment, determining whether the oil filter needs cleaning based on the pressure difference across the filter, the main oil passage pressure, and the rate of change of the pressure difference across the filter includes: if the pressure difference across the filter is greater than a first preset threshold, determining whether the main oil passage pressure is less than a second preset threshold and whether the rate of change of the pressure difference across the filter is greater than or equal to a third preset threshold; if the main oil passage pressure is less than the second preset threshold and the rate of change of the pressure difference across the filter is greater than or equal to the third preset threshold, determining that the oil filter needs cleaning; or, if the main oil passage pressure is greater than or equal to the second preset threshold and the rate of change of the pressure difference across the filter is less than the third preset threshold, determining that the oil filter does not need cleaning.

[0008] In one embodiment, the first preset threshold is any number between 95 and 105, the second preset threshold is any number between 332.5 and 367.5, and the third preset threshold is any number between 0.38 and 0.42.

[0009] In one embodiment, the method further includes: determining the rate of change of the main oil passage pressure in the previous preset cycle based on the filter main oil passage pressure in the previous preset cycle; and predicting the time of filter blockage based on the rate of change of the main oil passage pressure in the previous preset cycle, the second preset threshold, and the main oil passage pressure in the current cycle.

[0010] In one embodiment, the predicted time of filter clogging is t. p = (P4-m) / B, where P4 is the main oil passage pressure in the current cycle, m is the second preset threshold, and B is the rate of change of the main oil passage pressure in the previous preset cycle.

[0011] In one embodiment, the method further includes: determining whether the oil filter needs maintenance based on the main oil passage pressure, the rate of change of pressure difference before and after the filter and its corresponding fourth preset threshold; and issuing a maintenance reminder to the client if it is determined that the oil filter needs maintenance.

[0012] In one embodiment, determining whether the oil filter needs maintenance based on the main oil passage pressure, the rate of change of the pressure difference across the filter and its corresponding fourth preset threshold includes: determining that the oil filter needs maintenance when the main oil passage pressure is greater than or equal to the second preset threshold and the rate of change of the pressure difference across the filter is greater than the fourth preset threshold.

[0013] The present invention also provides a system for diagnosing faults in a diesel engine oil filter, comprising: a sensor module for collecting the pressure before the oil filter and the main oil passage pressure; and an electronic control unit for executing the method for diagnosing faults in the diesel engine oil filter.

[0014] A computer device includes a memory and a processor, the memory storing computer-readable instructions, which, when executed by the processor, cause the processor to perform the steps of the method for diagnosing diesel engine oil filter faults described above.

[0015] A storage medium storing computer-readable instructions, which, when executed by one or more processors, cause the one or more processors to perform the steps of the method for diagnosing diesel engine oil filter faults described above.

[0016] The aforementioned method and system for diagnosing diesel engine oil filter faults determine whether the oil filter needs cleaning based on the pressure difference across the filter, the main oil passage pressure, and the rate of change of the pressure difference across the filter. This eliminates pressure or pressure difference changes caused by damage to other components before cleaning the oil filter, thereby reducing the need for manual inspection and troubleshooting of abnormal pressure or pressure difference changes across the oil filter and facilitating a more accurate determination of whether the oil filter needs cleaning. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the framework of a diesel engine oil filter fault diagnosis system provided in one embodiment;

[0018] Figure 2 This is one of the flowcharts illustrating a method for diagnosing a diesel engine oil filter fault in one embodiment;

[0019] Figure 3 This is a second schematic flowchart of a method for diagnosing diesel engine oil filter faults in one embodiment;

[0020] Figure 4 This is a schematic diagram of experimental results on a benchtop machine provided in one embodiment;

[0021] Figure 5 This is a flowchart of a method for diagnosing diesel engine oil filter faults in one embodiment;

[0022] Figure 6 This is the fourth flowchart of a method for diagnosing diesel engine oil filter faults in one embodiment. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] The method and system for diagnosing diesel engine oil filter faults according to the present invention are described below with reference to the accompanying drawings.

[0026] Figure 1 The system for diagnosing diesel engine oil filter faults provided by the present invention includes: a sensor module 110 for collecting the pressure before the oil filter and the pressure of the main oil passage; and an electronic control unit 120 for executing the method for diagnosing diesel engine oil filter faults provided by the present invention.

[0027] like Figure 2 As shown, in one embodiment, a method for diagnosing diesel engine oil filter faults is proposed. This method can be executed by the aforementioned electronic control unit. The electronic control unit can be an electronic control unit on a ship. Specifically, as... Figure 2 As shown, the method for diagnosing diesel engine oil filter faults provided by the present invention may include the following steps:

[0028] Step 210: Based on the engine speed, and after determining that the speed meets the preset conditions, obtain the oil filter inlet pressure and main oil passage pressure within a preset time period.

[0029] In one embodiment, the step includes: based on the engine speed, and when the engine speed is greater than 0 rpm, obtaining the oil filter inlet pressure and main oil passage pressure within a preset time period.

[0030] The preset time period can be, for example, 100 seconds. It can be understood that within this preset time period, multiple data points on the pressure changes in front of the oil filter and in the main oil passage can be sampled using sensors installed before the oil filter and in the main oil passage. Therefore, the electronic control unit can obtain the pressure in front of the oil filter and the main oil passage pressure within the preset time period from the sensors.

[0031] Step 220: Based on the pressure before the oil filter and the pressure in the main oil passage, determine the pressure difference before and after the filter and the rate of change of the pressure difference before and after the filter.

[0032] The rate of change of the pressure difference across the filter can be the instantaneous rate of change of the difference ΔP between the pressure P1 before the oil filter and the pressure P2 in the main oil passage, or the average rate of change of the difference between the pressure before the oil filter and the pressure in the main oil passage over a preset time period Δt1. If the rate of change of the pressure difference across the filter is the average rate of change, then the rate of change of the pressure difference across the filter is expressed by the formula C = ΔP / Δt1. Here, ΔP = P1 - P2 represents the increase in the difference between the pressure before the oil filter and the pressure in the main oil passage within the preset time period Δt1, which is the pressure difference across the filter.

[0033] Step 230: Based on the pressure difference across the filter, the main oil passage pressure, and the rate of change of the pressure difference across the filter, determine whether the oil filter needs to be cleaned.

[0034] It is understood that, in addition to using the pressure difference before and after the filter to determine whether the oil filter needs cleaning, this invention also uses the main oil passage pressure and the rate of change of the pressure difference before and after the filter to determine whether the oil filter needs cleaning. Based on this, it can eliminate pressure or pressure difference changes caused by damage to other components before cleaning the oil filter or damage to other components in the main oil passage, thereby reducing the need for manual inspection and troubleshooting of abnormal pressure or pressure difference changes before and after the oil filter, and making it easier to more accurately determine whether the oil filter needs cleaning.

[0035] Step 240: If it is determined that the oil filter needs to be cleaned, issue an alarm indicating that the oil filter needs to be cleaned.

[0036] The method for diagnosing diesel engine oil filter faults provided by this invention determines whether the oil filter needs cleaning based on the pressure difference across the filter, the main oil passage pressure, and the rate of change of the pressure difference across the filter. This method can eliminate pressure or pressure difference changes caused by damage to other components before cleaning the oil filter, thereby reducing the need for manual inspection and troubleshooting of abnormal pressure or pressure difference changes across the oil filter, and facilitating a more accurate determination of whether the oil filter needs cleaning.

[0037] In one embodiment, such as Figure 3 As shown, determining whether the oil filter needs cleaning based on the pressure difference Δp across the filter, the main oil passage pressure P2, and the rate of change of the pressure difference C across the filter includes:

[0038] Step 310: If the pressure difference Δp across the filter is greater than the first preset threshold h, determine whether the main oil passage pressure P2 is less than the second preset threshold m, and whether the rate of change of the pressure difference across the filter C is greater than or equal to the third preset threshold n.

[0039] Under normal circumstances, filter clogging will cause the pressure difference Δp across the filter to increase, indicating that the filter needs to be cleaned. In other words, whether the filter needs cleaning can be initially determined by whether Δp is greater than a first preset threshold. However, since other factors can also cause the pressure difference across the filter to increase, relying solely on the pressure difference Δp to determine whether the filter needs cleaning may not be accurate.

[0040] Therefore, the causes of the above problems are analyzed as follows: The pressure difference Δp before and after the filter is affected by two variables. The first variable is the pressure before the oil filter, P1, and the second variable is the pressure in the main oil passage, P2. Δp will exceed the first preset threshold under the following conditions: First, P1 increases abnormally while P2 remains within a stable range, causing Δp to exceed the first preset threshold; Second, P1 remains within a stable range while P2 decreases abnormally, causing Δp to exceed the first preset threshold; Third, both P1 and P2 decrease abnormally, and the difference between P1 and P2 exceeds the first preset threshold, thus causing Δp to exceed the first preset threshold.

[0041] The inventive concept for solving the above problems is as follows: In the first case, Δp may be greater than the first preset threshold due to a malfunction in the components before the filter; in the second case, Δp may be greater than the first preset threshold because the filter needs to be cleaned. Therefore, to avoid or reduce the occurrence of Δp being greater than the first preset threshold due to a malfunction in the components before the filter, a judgment on P2 can be added, i.e., judging whether P2 is greater than the first preset threshold; in the third case, Δp may be greater than the first preset threshold due to a malfunction in the components before the filter, or it may be due to a malfunction in the components before the filter. When it is impossible to determine whether the filter needs to be cleaned based on the fact that neither Δp nor P2 can be determined, since the change process of Δp is a relatively stable process when cleaning is required, by further increasing the rate of change of Δp and the rate of change of the pressure difference before and after the filter C as reference factors, the influence of the malfunction of the components before the filter in the first and third cases can be further avoided, thereby achieving a more accurate determination of whether the filter needs to be cleaned.

[0042] Specifically, based on the main oil passage pressure P2 and the rate of change of pressure difference C before and after the filter, it can be further determined whether the oil filter needs to be cleaned, referring to steps 320 or 330.

[0043] Step 320: If the main oil passage pressure P2 is less than the second preset threshold m, and the rate of change of pressure difference C before and after the filter is greater than or equal to the third preset threshold n, it is determined that the oil filter needs to be cleaned.

[0044] Step 330: If the main oil passage pressure P2 is greater than or equal to the second preset threshold m, and the pressure difference change rate C before and after the filter is less than the third preset threshold n, then the oil filter is determined not to be cleaned.

[0045] In one embodiment, the first preset threshold h is any number between 95 and 105, the second preset threshold m is any number between 332.5 and 367.5, and the third preset threshold n is any number between 0.38 and 0.42.

[0046] Specifically, these parameters were obtained through experiments on a benchtop machine. For details, please refer to... Figure 4 The relevant explanation is as follows. It is understandable that these preset thresholds facilitate more accurate filter fault diagnosis.

[0047] Figure 4 Exemplary experimental data from a benchtop machine are provided. Figure 4 The experimental data shown primarily represents data before and after the diesel engine oil filter became clogged (requiring cleaning) after running for a certain period of time. For example... Figure 4 As shown, the x-axis represents the number of data points sampled in chronological order; the primary y-axis represents the pressure P1 before the oil filter and the pressure P2 in the main oil passage; and the secondary y-axis represents the pressure difference before and after the filter. The time interval between every 10,000 data points on the x-axis is 100 seconds. Specifically, from... Figure 4It can be seen that when x∈(30000~40000), P1 and P2 are relatively stable, P2≥m, and m can have a 5% deviation around 350. Therefore, the corresponding value is 332.5≤m≤367.5. △p<h, which means h can have a 5% deviation around 100. Therefore, the corresponding value is 95≤h≤100, and the corresponding average rate of change C=(80-70) / 100=0.1, so the filter does not need cleaning. When x∈(40000~50000) In the case where X∈(50000~60000), P1 and P2 fluctuate, P2≥m, Δp<h, and the corresponding average rate of change C=(80-60) / 100=0.2, the filter does not need cleaning; in the case where X∈(50000~60000), P1 and P2 show a decreasing trend, P2<m; Δp>h, and the corresponding average rate of change C=(130-90) / 100=0.4, the filter needs cleaning, and there can be a deviation of 5% around 0.4, therefore, the corresponding 0.38≤n≤0.4. After cleaning the filter, in the case where X∈(60000~70000), P1 and P2 are relatively stable, P2≥350; Δp<100, and C=(90-80) / 100=0.1, the filter does not need cleaning.

[0048] In one embodiment, such as Figure 5 As shown, the method further includes:

[0049] Step 510: Determine the rate of change B of the main oil passage pressure P3 in the previous preset cycle based on the filter main oil passage pressure P3 in the previous preset cycle.

[0050] The rate of change B is expressed by the formula B = ΔP3 / Δt2; where ΔP3 is the change in P3 within the previous preset period, and Δt2 is the time interval corresponding to the previous preset period.

[0051] Step 520: Based on the rate of change B of the main oil passage pressure P3 in the previous preset cycle, the second preset threshold m, and the main oil passage pressure P4 in the current cycle, predict the time t when the filter will become clogged. p .

[0052] In one embodiment, the predicted time of filter clogging is t. p = (P4-m) / B.

[0053] In one embodiment, such as Figure 6 As shown, the method further includes:

[0054] Step 610: Based on the main oil passage pressure, the rate of change of pressure difference before and after the filter and its corresponding fourth preset threshold, determine whether the oil filter needs maintenance.

[0055] Specifically, if the main oil passage pressure P2 is greater than or equal to the second preset threshold m, and the rate of change of the pressure difference before and after the filter is greater than the fourth preset threshold C, it is determined that the oil filter needs to be maintained.

[0056] The fourth preset threshold can be obtained by multiplying the third preset threshold n by the preset ratio d%. The preset ratio can be 95%.

[0057] It is understandable that, based on this step 610, a maintenance reminder can be issued to the user in a timely manner when the filter is about to become clogged, so that the user can perform maintenance in time and avoid trouble caused by filter clogging.

[0058] Step 620: If it is determined that the oil filter needs maintenance, a maintenance reminder is sent to the client.

[0059] In one embodiment, a computer device is provided, the computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the following steps corresponding to a method for diagnosing diesel engine oil filter faults: based on the engine speed, and assuming the engine speed meets preset conditions, acquiring the oil filter inlet pressure and main oil passage pressure within a preset time period; based on the oil filter inlet pressure and the main oil passage pressure, determining the pressure difference across the filter and the rate of change of the pressure difference across the filter; based on the pressure difference across the filter, the main oil passage pressure, and the rate of change of the pressure difference across the filter, determining whether the oil filter needs cleaning; and if it is determined that the oil filter needs cleaning, issuing an alarm indicating that the oil filter needs cleaning.

[0060] On the other hand, the present invention also provides a computer program product, the computer program product including a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions, when the program instructions are executed by a computer, the computer is able to execute the diesel engine oil filter fault diagnosis method provided by the present invention, wherein the diesel engine oil filter fault diagnosis method includes: based on the engine speed, and after determining that the engine speed meets preset conditions, obtaining the oil filter front pressure and main oil passage pressure within a preset time period; based on the oil filter front pressure and the main oil passage pressure, determining the pressure difference across the filter and the rate of change of the pressure difference across the filter; based on the pressure difference across the filter, the main oil passage pressure, and the rate of change of the pressure difference across the filter, determining whether the oil filter needs to be cleaned; and if it is determined that the oil filter needs to be cleaned, issuing an alarm that the oil filter needs to be cleaned. Furthermore, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements the method for diagnosing diesel engine oil filter faults provided by the present invention. The method for diagnosing diesel engine oil filter faults includes: obtaining the oil filter inlet pressure and main oil passage pressure within a preset time period, based on the engine speed and the determination that the engine speed meets preset conditions; determining the pressure difference across the filter and the rate of change of the pressure difference across the filter based on the oil filter inlet pressure and the main oil passage pressure; determining whether the oil filter needs cleaning based on the pressure difference across the filter, the main oil passage pressure, and the rate of change of the pressure difference across the filter; and issuing an alarm indicating that the oil filter needs cleaning if it is determined that the oil filter needs cleaning. The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment, depending on actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0061] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0062] 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for diagnosing faults in a diesel engine oil filter, characterized in that, The method includes: Based on the engine speed, and assuming that the engine speed meets preset conditions, the oil filter inlet pressure and main oil passage pressure are obtained within a preset time period. Based on the pressure before the oil filter and the pressure in the main oil passage, determine the pressure difference before and after the filter and the rate of change of the pressure difference before and after the filter; Based on the pressure difference across the filter, the main oil passage pressure, and the rate of change of the pressure difference across the filter, determine whether the oil filter needs to be cleaned. If it is determined that the oil filter needs to be cleaned, an oil filter cleaning warning will be issued. Based on the pressure difference across the filter, the main oil passage pressure, and the rate of change of the pressure difference across the filter, determine whether the oil filter needs cleaning, including: If the pressure difference across the filter is greater than a first preset threshold, determine whether the main oil passage pressure is less than a second preset threshold and whether the rate of change of the pressure difference across the filter is greater than or equal to a third preset threshold; if the main oil passage pressure is less than the second preset threshold and the rate of change of the pressure difference across the filter is greater than or equal to the third preset threshold, determine that the oil filter needs to be cleaned; or, if the main oil passage pressure is greater than or equal to the second preset threshold and the rate of change of the pressure difference across the filter is less than the third preset threshold, determine that the oil filter does not need to be cleaned. The method further includes: Based on the filter main oil passage pressure in the previous preset cycle, determine the rate of change of the main oil passage pressure in the previous preset cycle; based on the rate of change of the main oil passage pressure in the previous preset cycle, the second preset threshold, and the main oil passage pressure in the current cycle, predict the time when filter blockage will occur. The method further includes: Based on the main oil passage pressure, the rate of change of pressure difference before and after the filter, and the corresponding fourth preset threshold, it is determined whether the oil filter needs maintenance; if it is determined that the oil filter needs maintenance, a maintenance reminder is sent to the client.

2. The method for diagnosing diesel engine oil filter faults as described in claim 1, characterized in that, The first preset threshold is any number between 95 and 105, the second preset threshold is any number between 332.5 and 367.5, and the third preset threshold is any number between 0.38 and 0.

42.

3. The method for diagnosing diesel engine oil filter faults as described in claim 1, characterized in that, The predicted time of filter clogging is t. p =(P4-m) / B, where P4 is the main oil passage pressure in the current cycle, m is the second preset threshold, and B is the rate of change of the main oil passage pressure in the previous preset cycle.

4. The method for diagnosing diesel engine oil filter faults as described in claim 1, characterized in that, The determination of whether the oil filter needs maintenance based on the main oil passage pressure, the rate of change of pressure difference before and after the filter, and its corresponding fourth preset threshold includes: If the main oil passage pressure is greater than or equal to the second preset threshold, and the rate of change of the pressure difference before and after the filter is greater than the fourth preset threshold, it is determined that the oil filter needs to be maintained.

5. A system for diagnosing faults in a diesel engine oil filter, characterized in that, include: The sensor module is used to collect the pressure before the oil filter and the pressure in the main oil passage; An electronic control unit for performing the method for diagnosing a diesel engine oil filter fault as described in any one of claims 1 to 4.

6. A computer device comprising a memory and a processor, wherein the memory stores computer-readable instructions, characterized in that, When the computer-readable instructions are executed by the processor, the processor performs the steps of the method for diagnosing a diesel engine oil filter fault as claimed in any one of claims 1 to 4.

7. A storage medium storing computer-readable instructions, characterized in that, When the computer-readable instructions are executed by one or more processors, the one or more processors perform the steps of the method for diagnosing a diesel engine oil filter fault as claimed in any one of claims 1 to 4.

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