Method for Diagnosing and Regenerating a Diesel Particulate Filter for Construction Machinery

Abstract

A method for diagnosing and regenerating a construction machine DPF is disclosed. A method for diagnosing and regenerating a construction machine DPF according to one embodiment, in a method for diagnosing and regenerating a DPF (Diesel Particulate Filter) included in an exhaust aftertreatment device of a diesel engine, may include: a data collection step; a first appearance inspection step; a specification measurement step; a second appearance inspection step; a first pin gauge inspection step; an air flow test step before cleaning; a burning step; a bypass test step; an air pressure cleaning step; and an air flow test step after cleaning.

Description

Technology Field

[0001] The following examples relate to a method for diagnosing and regenerating a DPF for construction machinery. Background Technology

[0002] At the current level of technology, the diagnosis and regeneration processes for diesel particulate filters (DPFs) in construction machinery largely rely on the empirical judgment of skilled technicians. While quantitative data, such as airflow values ​​or fin gauge measurements, are used in some cases, there is a lack of systematic and consistent standards for utilizing this data. Consequently, there are limitations in accurately diagnosing the condition of the DPF or optimizing the regeneration process.

[0003] In particular, critical assessments regarding the DPF's burning status, regenerative capacity, and internal cracks often rely on visual inspections without clear numerical standards. This approach leads to significant variations in regeneration quality, consequently making it difficult to predict the DPF's performance and lifespan. Furthermore, because a visual inspection-centric approach relies heavily on the subjective judgment of skilled technicians, there is a high likelihood that diagnostic results will vary depending on the technician, even for DPFs in the same condition.

[0004] Furthermore, functions for automatically recording results during the cleaning process or predicting cleaning efficiency and reusability based on data are not sufficiently implemented in current commercial equipment. This acts as a major obstacle to objectively diagnosing the condition of DPFs and standardizing regeneration procedures. Therefore, a more systematic and data-driven approach is required to ensure reliability and consistency in the diagnosis and regeneration processes of DPFs. The problem to be solved

[0005] The embodiments aim to provide a method for diagnosing and regenerating a construction machine DPF, which quantitatively diagnoses the condition of the construction machine DPF, ensures consistency and reliability of regeneration quality, and improves maintenance efficiency.

[0006] The problems of the present invention are not limited to those mentioned above, and other unmentioned problems will be clearly understood by a person skilled in the art to which the present invention pertains from the description below. means of solving the problem

[0007] According to one embodiment of the present disclosure, a method for diagnosing and regenerating a Diesel Particulate Filter (DPF) included in an exhaust aftertreatment device of a diesel engine, comprising: a data collection step (S100) of receiving input data regarding the structure and operating principle of the exhaust aftertreatment device of the diesel engine, the DPF cleaning cycle and regeneration count, and the engine model, operating time, exhaust aftertreatment regeneration method, whether an SCR is installed, engine maintenance status, and oil and coolant consumption status; a first external inspection step (S200) of checking the fixing clamp, exhaust pipe connection part, and gas leakage of the DPF before removal from the exhaust aftertreatment device of the diesel engine, and recording the leakage type and extent of soot and ash; and a specification measurement step (S300) of removing the DPF from the exhaust aftertreatment device of the diesel engine, measuring the outer diameter, inner diameter, total height, ceramic height, and weight of the DPF, and determining whether it is subject to regeneration treatment. A second visual inspection step (S400) for checking the surface color of the intake and exhaust surfaces of the DPF, traces of oil or coolant ingress, cracks, discoloration, dents, and the degree of soot and ash accumulation; a first pin gauge inspection step (S500) for inserting pin gauges into a plurality of cells formed on the intake surface of the DPF to measure the depth of particulate matter accumulation; a pre-cleaning air flow test step (S600) for standing the DPF upright to measure the air flow rate in the direction of gas flow, determining whether to clean or burn the DPF based on the measured pressure, predicting the engine's maintenance and operating status, and educating and explaining the customer's management direction; and a burning step (S700) for heating the DPF to 600°C to burn internal soot if it is subject to burning in the pre-cleaning air flow test step.A bypass test step (S800) for inspecting whether ash is ejected from the discharge surface of the DPF for 2 to 5 minutes, and determining that if ash is ejected from 1 to 19 cells among the plurality of cells formed on the discharge surface of the DPF, it is judged as a micro-crack and is usable, and if ash is ejected from 20 or more cells among the plurality of cells formed on the discharge surface of the DPF, it is judged as an internal crack and is classified as defective and regeneration is stopped; an air pressure cleaning step (S900) for supplying compressed air in the reverse direction of the gas flow to remove ash and residual particulate matter inside the DPF, and alternately cleaning the intake and discharge surfaces of the DPF, and performing the cleaning in units of 30 to 60 minutes depending on the size; and a post-cleaning air flow test step (S1100) for standing the DPF upright after cleaning and measuring the air flow rate in the direction of the gas flow, and classifying it as normal if the measured pressure is 1 pressure or higher and less than 2 pressure, classifying it as subject to replacement if it is 2 pressure or higher and less than 3 pressure, and classifying it as unusable for regeneration if it is 3 pressure or higher. A method for diagnosing and regenerating a construction machinery DPF, comprising

[0008] At this time, the first pressure, the second pressure, and the third pressure are extracted from a reference pressure data set based on the manufacturer and size of the DPF confirmed in the specification measurement step.

[0009] At this time, after the bypass test step (S800) and before the airflow test step after cleaning (S1100), the second pin gauge inspection step (S1000) may be further included, in which the pin gauge is reinserted into a plurality of cells formed on the intake surface of the DPF to measure the depth of accumulation of particulate matter, and the clogging relief rate is calculated by comparing the values ​​before and after cleaning.

[0010] At this time, the airflow test step (S600) before cleaning may classify as non-burning when the measured pressure is 3.0 PSI or less, as burning when it is greater than 3.0 PSI and less than or equal to 4.0 PSI, as burning required when it is greater than 4.0 PSI and less than or equal to 6.0 PSI, and as engine inspection when it exceeds 6.0 PSI.

[0011] At this time, if the pressure measured in the airflow test step (S1000) after cleaning exceeds 3.0 PSI, the burning step (S700), air pressure cleaning step (S900), bypass test step (S800), the second pin gauge inspection step (S1000), and the airflow test step after cleaning (S1100) can be repeated up to 3 times.

[0012] At this time, in order to prevent thermal shock damage to the ceramic core in the above air pressure cleaning step (S900), the above air pressure cleaning step (S900) can be performed only when the surface temperature of the DPF after the above burning step (S700) is 51.6 degrees Celsius or lower.

[0013] Meanwhile, according to one embodiment of the present disclosure, in the bypass test step (S800)

[0014] Particulate matter ejected from the exhaust surface of the DPF can be detected visually, by an optical sensor, or by a particle sensor to distinguish between soot and ash, and the burning step (S700) can be repeated when soot is detected.

[0015] Meanwhile, according to one embodiment of the present disclosure, in the airflow test step (S600) before cleaning, if the pressure measured when excessive consumption of engine oil or coolant is confirmed by the data collected in the data collection step (S100) is 3.0 PSI or less, an internal crack of the DPF is estimated and classified as a defective burning target; if the pressure measured is greater than 3.0 PSI and less than 4.0 PSI, it is classified as a simple burning target; and if the pressure measured is 4.0 PSI or more, it is classified as a burning avoidance target and a warning can be given that the possibility of regeneration is low.

[0016] Meanwhile, according to one embodiment of the present disclosure, the method may further include a reuse determination step (S1200) which records air flow measurements before and after cleaning of the DPF in a database and automatically determines whether to reuse based on the final air flow measurement.

[0017] Meanwhile, according to one embodiment of the present disclosure, a quality recording step (S1300) may be further included, which captures the process of performing each step to automatically generate a customer report and stores the corresponding video data on a cloud server.

[0018] Meanwhile, according to one embodiment of the present disclosure, a diagnostic step (S1400) may be further included to generate a diagnostic report of abnormal items in the intake / exhaust system, EGR, fuel system, cooling system, or electrical system presumed to be the cause of the DPF blockage by analyzing the inspection results of the engine exhaust aftertreatment system.

[0019] Meanwhile, according to one embodiment of the present disclosure, a usage period prediction step (S1500) may be further included, which predicts a future engine maintenance cycle using the DPF cleaning results and calculates a replacement time based on the cumulative usage time, number of cleanings, and clogging resolution rate of the DPF. Effects of the invention

[0020] The embodiments can ensure consistency and reliability in regeneration quality by quantitatively diagnosing the condition of the DPF and standardizing the cleaning, burning, and regeneration processes step by step.

[0021] The embodiments can improve maintenance efficiency by automatically determining whether the DPF can be reused and when to replace it by converting pressure values, pin gauge measurements, bypass test results, etc., into data.

[0022] The embodiments can reduce variations in regeneration quality and increase the reliability of the equipment by objectively evaluating the condition of the DPF and standardizing the regeneration procedure through systematic diagnosis and regeneration procedures including external inspection of the DPF, specification measurement, pin gauge inspection, airflow test, and bypass test.

[0023] The effects of the present disclosure are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the description of the present disclosure or the claims. Brief explanation of the drawing

[0024] FIG. 1 is a flowchart of a method for diagnosing and regenerating a construction machine DPF according to one embodiment of the present disclosure. FIG. 2 is a cross-sectional view showing the intake surface of a DPF in a method for diagnosing and regenerating a construction machine DPF according to one embodiment of the present disclosure. Specific details for implementing the invention

[0025] Hereinafter, embodiments are described in detail with reference to the attached drawings. However, various modifications may be made to the embodiments, and thus the scope of the patent application is not limited or restricted by these embodiments. It should be understood that all modifications, equivalents, and substitutions to the embodiments are included within the scope of the rights.

[0026] Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only and may be modified and implemented in various forms. Accordingly, the embodiments are not limited to the specific disclosed forms, and the scope of this specification includes modifications, equivalents, or substitutions that fall within the technical concept.

[0027] Terms such as "first" or "second" may be used to describe various components, but these terms should be interpreted solely for the purpose of distinguishing one component from another. For example, the first component may be named the second component, and similarly, the second component may be named the first component.

[0028] When it is stated that a component is "connected" to another component, it should be understood that it may be directly connected to or joined to that other component, or that there may be other components in between.

[0029] The terms used in the embodiments are for illustrative purposes only and should not be interpreted as intended to be limiting. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0030] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the embodiments pertain. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0031] In addition, when describing with reference to the attached drawings, identical components are assigned the same reference numeral regardless of drawing symbols, and redundant descriptions thereof are omitted. In describing the embodiments, if it is determined that a detailed description of related prior art could unnecessarily obscure the essence of the embodiments, such detailed description is omitted.

[0032] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0033] In the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in the embodiments of the present invention.

[0034] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are exemplary, and therefore the present invention is not limited to the depicted details. Furthermore, in describing the present invention, if it is determined that a detailed description of related known technology may unnecessarily obscure the essence of the present invention, such detailed description is omitted. Where terms such as "includes," "has," or "is made up" are used in this specification, other parts may be added unless "only" is used. Where a component is expressed in the singular, it includes cases where it includes the plural unless specifically stated otherwise.

[0035] In interpreting the components, they are interpreted to include a margin of error even in the absence of a separate explicit statement.

[0036] In the case of describing a positional relationship, for example, when the positional relationship between two parts is described using expressions such as 'on,' 'upper,' 'lower,' or 'next to,' one or more other parts may be located between the two parts unless 'immediately' or 'directly' is used.

[0037] When elements or layers are referred to as "on" another element or layer, this includes cases where another layer or element is placed directly on top of or in between. Throughout the specification, the same reference numerals refer to the same components.

[0038] The size and thickness of each component shown in the drawings are illustrated for convenience of explanation, and the present invention is not necessarily limited to the size and thickness of the illustrated components.

[0039] The features of each of the various embodiments of the present invention may be combined or combined with one another, either partially or wholly, and as will be fully understood by those skilled in the art, various technical interlocking and operation are possible, and each embodiment may be implemented independently of one another or together in an interlocking relationship.

[0040] FIG. 1 is a flowchart of a method for diagnosing and regenerating a construction machine DPF according to one embodiment of the present disclosure. FIG. 2 is a cross-sectional view showing the intake surface of a DPF of a method for diagnosing and regenerating a construction machine DPF according to one embodiment of the present disclosure.

[0041] As illustrated in FIG. 1, the method for diagnosing and regenerating a construction machine DPF (S1) is a method for diagnosing and regenerating a Diesel Particulate Filter (DPF) included in an exhaust aftertreatment device of a diesel engine, comprising a data collection step (S100), a first visual inspection step (S200), a specification measurement step (S300), a second visual inspection step (S400), a first pin gauge inspection step (S500), an air flow test step before cleaning (S600), a burning step (S700), an air pressure cleaning step (S900), a bypass test step (S800), a second pin gauge inspection step (S1000), an air flow test step after cleaning (S1100), a reuse determination step (S1200), a quality recording step (S1300), a diagnosis step (S1400), a usage period prediction step (S1500), an artificial intelligence learning step (S1600), an artificial intelligence control step (S1700), a predictive maintenance step (S1800), and a cloud It may include a base integration management step (S1900).

[0042] A method for diagnosing and regenerating a construction machine DPF (S1) according to one embodiment of the present disclosure is described as a method for diagnosing and regenerating a DPF included in a diesel engine exhaust aftertreatment device installed in a construction machine. However, the present disclosure may be applied to any machine that includes a diesel engine and requires a DPF, and is not necessarily applicable only to construction machines.

[0043] In the data collection step (S100), data regarding the construction machine on which the construction machine DPF is installed can be collected. For example, data regarding the structure and operating principle of the exhaust aftertreatment device of a diesel engine can be received. In addition, data regarding the DPF cleaning cycle and the number of regeneration cycles can be received. The method for diagnosing and regenerating the construction machine DPF (S1) can collect operational data including the engine model, operating time, exhaust aftertreatment regeneration method (Passive or Active), whether SCR (Selective Catalytic Reduction) is installed, engine maintenance status, and oil and coolant consumption status. Through such data, it is possible to determine in advance whether the DPF is regenerable, thereby preventing unnecessary DPF regeneration.

[0044] The first external inspection step (S200) can be performed before removing the DPF from the exhaust aftertreatment device of the diesel engine. The condition of the DPF fixing clamp can be checked. The fastening condition of the exhaust pipe connection and the presence of gas leakage can be checked. Based on the inspection results, the type and extent of soot and ash leakage can be recorded.

[0045] In the specification measurement step (S300), the physical specifications of the DPF can be measured after removing the DPF from the exhaust aftertreatment device of the diesel engine. For example, the outer diameter, inner diameter, total height, ceramic height, and weight of the DPF can be measured precisely. Based on the measured specification data, it can be determined whether the DPF is suitable for regeneration treatment. In this way, by measuring the specifications and confirming that the DPF is capable of regeneration treatment, failure of the regeneration device or damage to the DPF can be prevented in advance.

[0046] In the second visual inspection step (S400), the surface condition of the intake and exhaust surfaces of the DPF can be closely inspected. Changes in surface color, traces of oil or coolant ingress, the presence of cracks, discoloration, dents, etc., can be checked. In addition, the degree of accumulation of soot and ash can be visually evaluated and recorded. The difference is that while the first visual inspection step (S200) inspects the exterior of the exhaust aftertreatment device of a diesel engine in which a DPF is installed, the second visual inspection step (S400) inspects the exterior of the DPF itself. By sequentially proceeding with the first visual inspection step (S200), the specification measurement step (S300), and the second visual inspection step (S400), the inspection can be performed according to the process of disassembling the DPF, thereby enabling efficient diagnosis.

[0047] In the first pin gauge inspection step (S500), the method for diagnosing and regenerating a construction machine DPF (S1) can perform the first pin gauge inspection. A pin gauge can be inserted into each of the plurality of cells formed on the intake surface of the DPF. By inserting the pin gauge, the depth of particulate matter accumulated inside the cell can be quantitatively measured. The measured data can be used as basic data to determine the degree of clogging of the DPF.

[0048] As illustrated in FIG. 2, there may be a total of 21 locations where the pin gauge is inserted in the first pin gauge inspection step (S500). Inner and outer points can be selected at predetermined intervals along the center and circumferential direction of the circular intake surface of the DPF. In this embodiment, time positions at 1:30, 3:00, 6:00, 7:30, 9:00, 10:30, and 12:00 are inspected clockwise along the inner circumference, and time positions at 1:00, 2:00, 3:00, 4:00, 5:00, 6:00, 7:00, 8:00, 9:00, 10:00, 11:00, and 12:00 are inspected clockwise along the outer circumference.

[0049] In the pre-cleaning airflow test step (S600), a constant flow rate of air can be supplied in the direction of gas flow while the DPF is positioned vertically. The airflow resistance inside the DPF can be evaluated by measuring the pressure generated at this time. Based on the measured pressure value, it can be determined whether to perform the subsequent burning step (S700).

[0050] In one embodiment of the present disclosure, the pre-cleaning airflow test step (S600) may subdivide and classify the condition of the DPF according to the measured pressure. When the measured pressure is 3.0 PSI or less, it may be classified as non-burning target. When the measured pressure is greater than 3.0 PSI and less than or equal to 4.0 PSI, it may be classified as burning target. When the measured pressure is greater than 4.0 PSI, it may be classified as burning mandatory target. At this time, if the measured pressure exceeds 3.0 PSI, it may be classified as engine inspection target and additional diagnosis may be recommended. In particular, if the measured pressure exceeds 6.0 PSI, it may be classified as engine mandatory inspection target due to engine factory risk situation and additional diagnosis may be strongly recommended. In this way, through the pre-cleaning airflow test step (S600), it is possible to prevent the reduction of DPF durability by burning a DPF that does not require burning, and to prevent additional engine damage and unnecessary DPF waste by anticipating engine inspections that cause DPF clogging problems.

[0051] In one embodiment of the present disclosure, data collected in the data collection step (S100) can be utilized in the pre-cleaning airflow test step (S600). If excessive consumption of engine oil or coolant is confirmed, and the measured pressure is 3.0 PSI or lower, it can be determined that there is an internal crack in the DPF. In this case, the DPF can be classified as defective and classified as a defective burning target. If the measured pressure is greater than 3.0 PSI and less than 4.0 PSI, it can be classified as a simple burning target. If the measured pressure is 4.0 PSI or higher, it can be classified as a burning avoidance target and a warning can be issued that the likelihood of re-creation is low. In this way, by using data from components other than the DPF to determine the cleaning of the DPF based on different criteria, it becomes possible to predict the condition of the DPF and apply a cleaning method appropriate to it without performing a precise inspection of the DPF. Furthermore, it becomes possible to prevent excessive cleaning of the DPF or excessive replacement of the DPF due to fundamental problems of the vehicle. In this case, unlike simple burning targets, if ash ejection is confirmed through the discharge surface during the bypass test step (S800) in the case of a defective burning target, regeneration is stopped and the DPF is discarded. Accordingly, not only can unnecessary regeneration be prevented, but failure of other parts caused by using an unregenerated DPF can also be prevented.

[0052] In the burning step (S700), a high-temperature heat treatment process can be performed on the DPF classified as a burning target in the pre-cleaning airflow test step (S600). The DPF is inserted into a dedicated burning machine and heated at a temperature of approximately 600°C for about 12 hours. Through this high-temperature heat treatment, soot collected inside the DPF begins to burn at a temperature of approximately 450°C or higher, and can be effectively burned and removed by maintaining a constant temperature of 600°C. On the other hand, since there is a risk of internal cracks occurring due to thermal shock to the ceramic substrate at temperatures of 700°C or higher, the heating temperature is limited to 600°C to perform stable regeneration. In the burning step (S700), most of the soot is burned, but some remains as ash, which is a non-combustible residue. Ash can only be oxidized and removed at a temperature of approximately 980°C, but since the DPF cannot withstand that temperature, ash removal is performed in the subsequent air pressure cleaning step (S900).

[0053] In the bypass test step (S800), whether ash is ejected from the exhaust surface of the DPF after the cleaning process can be inspected for 2 to 5 minutes. The reason for limiting the time to a maximum of 5 minutes is that if it exceeds 5, the reliability of ash ejection from the DPF exhaust surface decreases. Therefore, it is desirable to determine whether ash is ejected within 2 to 5 minutes. At this time, if ash is ejected from 1 to 19 cells among the multiple cells formed on the exhaust surface of the DPF, it can be determined as a micro-crack and classified as usable. If ash is ejected from 20 or more cells among the multiple cells formed on the exhaust surface of the DPF, it can be determined as an internal crack, classified as defective, and regeneration can be stopped. In this way, by providing criteria for stopping regeneration, it is possible to prevent the repetition of unnecessary steps and the inefficient operation of the regeneration period by determining that a DPF cannot be regenerated after going through all the steps described below.

[0054] In one embodiment of the present disclosure, particulate matter ejected from the exhaust surface of the DPF can be detected during the bypass test step (S800). For example, particulate matter can be detected using the naked eye, an optical sensor, or a particle sensor. Soot and ash can be distinguished through the sensor, and if soot is detected, the burning step (S700) can be repeated to completely remove the remaining soot.

[0055] In the air pressure cleaning step (S900), compressed air can be supplied into the DPF in the reverse direction of the gas flow. The compressed air can physically remove ash and residual particulate matter inside the DPF that were not eliminated during the burning step. At this time, the cleaning efficiency can be further increased by alternately cleaning the intake and exhaust surfaces of the DPF during the compressed air supply process. Depending on the size of the DPF measured in the specification measurement step (S300), air pressure cleaning can be performed in intervals of 30 to 60 minutes.

[0056] In one embodiment of the present disclosure, thermal shock damage to the ceramic core can be prevented during the air pressure cleaning step (S900). To this end, the air pressure cleaning step (S900) can be performed only when the surface temperature of the DPF has been sufficiently cooled to 51.6 degrees Celsius or lower after the burning step (S700). In this way, by setting a standard temperature to prevent damage to the ceramic core, the regeneration time can be efficiently managed while minimizing damage to the DPF.

[0057] In one embodiment of the present disclosure, the method for diagnosing and regenerating a construction machine DPF (S1) may further include a second pin gauge inspection step (S1000). The second pin gauge inspection step (S1000) may be performed after the bypass test step (S800) and before the airflow test step after cleaning (S1100). In the second pin gauge inspection step (S1000), the depth of particulate matter accumulation may be measured again by reinserting pin gauges into a plurality of cells formed on the intake surface of the DPF. The clogging resolution rate may be quantitatively calculated by comparing the pin gauge measurements before and after cleaning. The calculated clogging resolution rate may be used as data to calculate the number of additional regeneration cycles. At this time, it is preferable that the position where the pin gauge is reinserted is the same position as the position where it was inserted in the first pin gauge inspection step (S500).

[0058] In the airflow test step (S1100) after washing, the DPF, having been washed and cleaned, is set up vertically again, and compressed air is supplied in the direction of gas flow to measure the air flow rate. At this time, depending on the measured pressure, it can be classified as normal, subject to replacement, or non-regeneration. At this time, the reference value for the pressure measurement may vary depending on the manufacturer and size of the DPF. That is, the pressure measurement value is extracted from a reference pressure data set according to the manufacturer and size of the DPF confirmed in the specification measurement step (S300). The first pressure, second pressure, and third pressure are extracted in order, and if the measured pressure is greater than or equal to the first pressure and less than the second pressure, it can be classified as normal. Additionally, if the measured pressure is greater than or equal to the second pressure and less than the third pressure, it can be classified as subject to replacement, and if the measured pressure is greater than or equal to the third pressure, it can be classified as non-regeneration and a mandatory DPF replacement. At this time, the first pressure, second pressure, and third pressure may vary depending on the manufacturer and size, for example, they may be 1.9 PSI, 2.6 PSI, and 3.0 PSI in order.

[0059] In one embodiment of the present disclosure, if the pressure measured in the airflow test step (S1100) after cleaning exceeds 3.0 PSI, the regeneration process may be repeated. In this case, the burning step (S700), the air pressure cleaning step (S900), the bypass test step (S800), the second pin gauge inspection step (S1000), and the airflow test step after cleaning (S1100) may be performed again in sequence. This repetition may be performed up to a maximum of three times. After the final three repetitions, if the pressure measured in the airflow test step after cleaning (S1100) is 3.0 PSI or higher, it is classified as completely unregenable. By doing so, the use of a DPF that is subject to final replacement or has been determined to be unregenable is prevented, thereby preventing additional damage to other components of the engine exhaust aftertreatment device.

[0060] In one embodiment of the present disclosure, the method for diagnosing and regenerating a construction machine DPF (S1) may further include a step for determining whether to reuse it (S1200). In the step for determining whether to reuse it (S1200), air flow measurements before and after cleaning of the DPF may be recorded in a database. Based on the final air flow measurement, the possibility of regenerating the DPF can be automatically determined. This serves as important data for determining whether additional DPF regeneration is possible when the DPF user does not have data regarding the number of times the DPF has been regenerated.

[0061] In one embodiment of the present disclosure, the method for diagnosing and regenerating a construction machine DPF (S1) may further include a quality recording step (S1300). In the quality recording step (S1300), the method for diagnosing and regenerating a construction machine DPF (S1) may record the execution process of each step as video. A report to be provided to a customer can be automatically generated using the recorded video. The corresponding video data may be stored on a cloud server for quality assurance and history management.

[0062] In one embodiment of the present disclosure, the method for diagnosing and regenerating a construction machine DPF (S1) may further include a diagnosis step (S1400). In the diagnosis step (S1400), the method for diagnosing and regenerating a construction machine DPF (S1) may comprehensively analyze the inspection results of the diesel engine exhaust aftertreatment system. Through the analysis results, items presumed to be the fundamental cause of DPF clogging may be identified. For example, a diagnosis report may be generated that includes abnormal items in the intake and exhaust system, EGR (Exhaust Gas Recirculation), fuel system, cooling system, or electrical system.

[0063] In one embodiment of the present disclosure, the method for diagnosing and regenerating a construction machine DPF (S1) may further include a usage period prediction step (S1500). In the usage period prediction step (S1500), the method for diagnosing and regenerating a construction machine DPF (S1) can predict the future engine maintenance cycle using the DPF cleaning results. The replacement time of the DPF can be quantitatively calculated based on the cumulative usage time of the DPF, the number of cleanings, and the clogging resolution rate data.

[0064] Although embodiments of the present invention have been described in more detail with reference to the attached drawings, the present invention is not necessarily limited to these embodiments and may be modified in various ways within the scope of the technical spirit of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of protection of the present invention shall be interpreted by the claims below, and all technical spirits within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

[0065] Therefore, other implementations, other embodiments, and equivalents to the claims also fall within the scope of the claims set forth below. Explanation of the symbols

[0066] S1: Diagnosis and Regeneration Method for Construction Machinery DPFs S100: Data collection stage S200: 1st exterior inspection step S300: Specification measurement stage S400: 2nd visual inspection stage S500: 1st pin gauge inspection step S600: Airflow test stage before cleaning S700: Burning stage S800: Bypass test stage S900: Air pressure cleaning step S1000: Second pin gauge inspection step S1100: Airflow test step after washing S1200: Washing efficiency calculation step S1300: Quality Recording Step S1400: Diagnostic stage S1500: Usage period prediction step

Claims

Claim 1 A method for diagnosing and regenerating a Diesel Particulate Filter (DPF) included in an exhaust aftertreatment device of a diesel engine, comprising: a data collection step of receiving input data on the structure and operating principle of the exhaust aftertreatment device of the diesel engine, the DPF cleaning cycle and regeneration frequency, and data on the engine model, operating time, exhaust aftertreatment regeneration method, whether an SCR is installed, engine maintenance status, and oil and coolant consumption status; a first visual inspection step of checking the fixing clamp, exhaust pipe connection, and gas leakage of the DPF before removal from the exhaust aftertreatment device of the diesel engine, and recording the leakage pattern and extent of soot and ash; a specification measurement step of removing the DPF from the exhaust aftertreatment device of the diesel engine and measuring the outer diameter, inner diameter, total height, ceramic height, and weight of the DPF to determine whether it is subject to regeneration treatment; and a second visual inspection step of checking the surface color of the intake and exhaust surfaces of the DPF, traces of oil or coolant inflow, cracks, discoloration, dents, and the degree of soot and ash accumulation. A first pin gauge inspection step of inserting pin gauges into a plurality of cells formed on the intake surface of the DPF to measure the depth of accumulation of particulate matter; a pre-cleaning air flow test step of standing the DPF upright to measure the air flow rate in the direction of gas flow and determining whether to burn based on the measured pressure; a burning step of heating the DPF to 600°C to burn internal soot if it corresponds to a burning target in the pre-cleaning air flow test step; and a bypass test step of inspecting for ash emission from the discharge surface of the DPF for 2 to 5 minutes, and determining that if ash is ejected from 1 to 19 of the plurality of cells formed on the discharge surface of the DPF, it is judged as a micro-crack and deemed usable, and if ash is ejected from 20 or more of the plurality of cells formed on the discharge surface of the DPF, it is judged as an internal crack, classified as defective, and regeneration is stopped.A pneumatic cleaning step in which compressed air is supplied in the reverse direction of the gas flow to remove ash and residual particulate matter inside the DPF, and the intake and exhaust surfaces of the DPF are alternately cleaned, and performed in units of 30 to 60 minutes depending on the size; a post-cleaning airflow test step in which, after cleaning, the DPF is stood upright and the air flow rate is measured in the direction of the gas flow, and if the measured pressure is greater than or equal to a first pressure and less than a second pressure, it is classified as normal; if it is greater than or equal to a second pressure and less than a third pressure, it is classified as subject to replacement; and if it is greater than or equal to a third pressure, it is classified as unusable; wherein the first pressure, the second pressure, and the third pressure are extracted from a reference pressure data set based on the manufacturer and size of the DPF confirmed in the specification measurement step, and a second pin gauge inspection step in which, after the bypass test step and before the post-cleaning airflow test step, the pin gauge is reinserted into a plurality of cells formed on the intake surface of the DPF to measure the depth of accumulation of particulate matter, and the clogging resolution rate is calculated by comparing the values ​​before and after cleaning; A method for diagnosing and regenerating a construction machinery DPF, further comprising Claim 2 delete Claim 3 A method for diagnosing and regenerating a construction machine DPF according to claim 1, wherein the airflow test step prior to cleaning is classified as non-burning target when the measured pressure is 3.0 PSI or less, classified as burning target and engine inspection target when the pressure is greater than 3.0 PSI and less than or equal to 4.0 PSI, classified as burning mandatory target and engine inspection target when the pressure is greater than 4.0 PSI and less than or equal to 6.0 PSI, and classified as engine mandatory inspection target according to the risk of engine failure when the pressure exceeds 6.0 PSI. Claim 4 A method for diagnosing and regenerating a construction machine DPF according to claim 3, wherein if the pressure measured in the airflow test step after cleaning exceeds 3.0 PSI, the burning step, the air pressure cleaning step, the bypass test step, the second pin gauge inspection step, and the airflow test step after cleaning are repeated up to three times. Claim 5 A method for diagnosing and regenerating a construction machine DPF according to claim 4, wherein in the air pressure cleaning step, the air pressure cleaning step is performed only when the surface temperature of the DPF after the burning step is 51.6 degrees Celsius or lower in order to prevent thermal shock damage to the ceramic core.

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