A hydraulic clutch early engagement fault point finding method

Abstract

This invention relates to the field of troubleshooting and testing technology for hydraulic clutches in turbocharger starters, and particularly to a method for locating fault points in hydraulic clutches that cause premature engagement. The method includes: SS1, collecting fault information and drawing a fault tree for premature engagement of the hydraulic clutch based on the fault type; SS2, conducting a simulation test on the premature engagement fault of the hydraulic clutch according to the fault tree, checking the fault points one by one in the fuel pump, hydraulic clutch, reducer, and left and right housings of the hydraulic clutch, and recording the fault points. This invention conducts a troubleshooting simulation test on the premature engagement fault of the hydraulic clutch, summarizes the test method, draws a fault tree, and checks each fault point one by one. While improving the accuracy of fault diagnosis, it reduces excessive reliance on operator experience in troubleshooting analysis and location, avoids repetitive and disordered work, reduces troubleshooting cycle and cost. Through the formulation of improvement measures, test runs have verified good results, significantly reducing the failure rate and improving production delivery efficiency.

Description

Technical Field

[0001] This invention relates to the field of troubleshooting and testing technology for hydraulic clutches of turbine starters, specifically a method for locating faults caused by premature engagement of hydraulic clutches. Background Technology

[0002] The hydraulic clutch is an important component that enables the starter to drive the engine at a specified speed. If the starter drives the engine at a speed lower than the specified speed, it is considered a premature engagement fault. This engagement speed is an important performance indicator that is tested during starter testing.

[0003] When the starter motor is operating at its designated speed, the hydraulic clutch spring plate closes the drain hole, and oil is primarily drained through the normally open hole. After the stop button is pressed, the clearance between the spring plate and the inner wall of the outer casing increases as the speed decreases, widening the drain passage. The lubricating oil in the hydraulic clutch is then thrown out of the drain hole by centrifugal force, and flows out of the drain hole by gravity after the starter motor stops. If the flow rate through the drain hole on the inner surface of the hydraulic clutch outer casing is too low, lubricating oil may remain in the hydraulic clutch cavity after the starter motor stops operating. Since the hydraulic clutch relies on the lubricating oil in its cavity for engagement, under normal circumstances, lubricating oil fills the hydraulic clutch cavity and engages when the starter motor reaches the specified speed. If lubricating oil remains in the hydraulic clutch cavity, it is equivalent to lubricating oil prematurely filling the hydraulic clutch, causing premature engagement.

[0004] Data shows that since its development, premature start-up has been a major problem for starter motors. This problem is caused by many factors, is difficult to solve, and occurs frequently. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a method for locating fault points in the premature engagement of a hydraulic clutch.

[0006] This invention is achieved through the following technical solution:

[0007] A method for locating faults caused by premature engagement of a hydraulic clutch includes:

[0008] SS1 collects fault information and draws a fault tree for early engagement of the hydraulic clutch based on the fault type;

[0009] SS2: Conduct a simulation test on the premature engagement fault of the hydraulic clutch according to the fault tree. Check the fault points of the fuel pump, hydraulic clutch, reducer and left and right housings of the hydraulic clutch one by one and record the fault points. If the fault point is still not found after checking all structures, check all structures again until the fault point is found.

[0010] Preferably, in SS2, troubleshooting the fuel pump includes: checking whether the fuel pump is supplying fuel prematurely; if so, recording the fault point X1; otherwise, troubleshooting other structural fault points.

[0011] Preferably, in SS2, troubleshooting the hydraulic clutch includes:

[0012] S201, Disassemble the internal structure of the hydraulic clutch and check for any abnormalities such as poor hydraulic clutch oil leakage or short test intervals. Verify whether the abnormalities lead to excessive oil accumulation. If it is related to poor hydraulic clutch oil leakage, proceed to S202; otherwise, proceed to S203.

[0013] S202, check whether the hydraulic clutch oil leakage is related to the elastic plate valve. If so, record the fault point and verify whether it causes the oil leakage. Otherwise, check whether the oil leakage is related to the size of the housing oil leakage hole or the clutch test flow. If so, record the fault point and verify whether it causes the oil leakage. Otherwise, proceed to S203.

[0014] S203, conduct a simulated test of the hydraulic clutch test interval time, check for any abnormalities and verify whether the length of the interval is related to poor oil leakage. If so, record the fault point X7; otherwise, investigate the fault points of other structures.

[0015] Preferably, in S202, check whether the hydraulic clutch oil leakage is related to the elastic plate valve. If so, record the fault point, including:

[0016] Check if the elastic sheet has too low a hardness. If so, record the fault point X2.

[0017] Check if the spring plate radius is too large. If so, record the fault point X3.

[0018] Check if the spring elasticity is too low. If so, record the fault point X4.

[0019] Preferably, in S202, it is checked whether the poor oil leakage is related to the size of the oil leakage hole in the housing or the test flow rate of the clutch. If so, the fault point is recorded, and it is verified whether it causes the poor oil leakage, including:

[0020] Check if the poor oil leakage is related to the small size of the oil leakage hole in the housing. If so, record the fault point X5.

[0021] Check if the poor oil flow is related to the low test flow of the clutch. If so, record the fault point X6.

[0022] Preferably, in SS2, the fault location of the reducer is checked, including:

[0023] S301, check whether the reducer lubricating oil is leaking into the clutch: check whether it is related to poor ball surface sealing. If so, proceed to S302; otherwise, proceed to S303.

[0024] S302, check if the reducer lubricating oil is related to the sealing of the spherical parts. If so, record the fault point; otherwise, proceed to S303.

[0025] S303, check if the reducer lubricating oil is related to the clearance between the hydraulic clutch drain pipe and the gear shaft. If so, record the fault point X14; otherwise, troubleshoot other structural fault points.

[0026] Preferably, in S302, checking whether the reducer lubricating oil is related to the sealing performance of the spherical parts includes:

[0027] Check if the spherical surface fit is poor; if so, record the fault point X8.

[0028] Check if the spherical contact width is too small. If so, record the fault point X9.

[0029] Check for poor spherical contact; if so, conduct a detailed inspection.

[0030] Preferably, check for poor spherical contact, including:

[0031] Check if the axial dimension of the spherical part is deviated. If so, record the fault point X10.

[0032] Check if the spring mounting bracket is not properly supported. If so, record the fault point X11.

[0033] Check if the elastic dimension performance deviates. If so, record the fault point X12.

[0034] Check if the static balance is poor and the vibration is large. If so, record the fault point X13. Otherwise, check the fault points of other structures.

[0035] Preferably, in SS2, fault point investigation is performed on the left and right housings of the hydraulic clutch, including:

[0036] S401, check if there is any jamming in the left and right housings of the hydraulic clutch. If so, proceed to S402; otherwise, after eliminating the cause of this fault, proceed to SS3.

[0037] S402, check if the hydraulic clutch housing fit dimensions are off. If so, record the fault point X15; otherwise, proceed to S403.

[0038] S403, check if any foreign objects have entered the hydraulic clutch mating surface. If so, record the fault point X16; otherwise, proceed to SS3.

[0039] Preferably, it also includes SS3, which takes corresponding measures to eliminate the fault based on the recorded fault point.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] This invention provides a method for locating faults related to premature engagement of hydraulic clutches. Addressing the abnormal premature engagement phenomenon during hydraulic clutch operation, the method involves designing and implementing troubleshooting simulation tests, systematically summarizing effective test procedures and analysis steps. Specifically: First, existing fault information is collected to construct a fault tree. Then, based on the fault tree, a step-by-step troubleshooting and cause localization are conducted. Troubleshooting simulation tests are performed on premature engagement faults in hydraulic clutches, test methods are summarized, fault trees are drawn, and each fault is checked systematically. The structured fault tree guidance avoids repetitive testing and disordered operations common in traditional troubleshooting processes, thereby reducing human error and saving maintenance time and costs. Based on the identified fault points, targeted improvement measures can be implemented. During test runs, the time spent troubleshooting can be shortened, improving testing and delivery efficiency. Attached Figure Description

[0042] Figure 1 This is a flowchart of a method for locating faults caused by premature engagement of a hydraulic clutch according to the present invention;

[0043] Figure 2 This is a fault tree in the method for finding fault points of early engagement of a hydraulic clutch according to the present invention. Detailed Implementation

[0044] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0045] This invention discloses a method for locating faults caused by premature engagement of a hydraulic clutch, referring to... Figures 1-2 ,include:

[0046] SS1 collects fault information and draws a fault tree for early engagement of the hydraulic clutch based on the fault type. The fault tree includes the fault type, fault cause, and corresponding measures.

[0047] Premature engagement of the hydraulic clutch can be caused by several factors, including premature fuel pump supply, excessive oil buildup in the hydraulic clutch, oil seeping into the clutch from the reducer, and jamming of the left and right housings of the hydraulic clutch.

[0048] Excessive oil accumulation in the hydraulic clutch includes issues such as poor hydraulic clutch operation due to leakage and short test intervals.

[0049] Poor oil flow in hydraulic clutches can be caused by issues with the spring plate valve, an undersized oil leakage hole in the housing, or insufficient clutch test flow.

[0050] Oil leakage from the reducer into the clutch can be caused by poor spherical sealing and large clearance between the oil drain pipe and gear shaft.

[0051] Poor spherical sealing performance includes low spherical fit, small spherical contact width, and poor spherical contact (due to deviation of axial dimensions of spherical parts, improper support of spring mounting base, deviation of elastic dimension performance, and poor static balance resulting in large vibrations).

[0052] The measures taken to address the fault point are as follows: select spring sheets with a larger elastic coefficient, reduce the tolerance range of the spring sheet arc diameter, and increase the spring sheet gap to ensure the leakage of the outer cover.

[0053] SS2, according to the fault tree, simulated the premature engagement fault of the hydraulic clutch. The fault points of the fuel pump, hydraulic clutch, reducer, and left and right housings of the hydraulic clutch were checked one by one and recorded. Specifically:

[0054] Troubleshooting the fuel pump includes checking if it is supplying fuel prematurely; if so, record the fault as X1; otherwise, check for faults in other components.

[0055] Troubleshooting the hydraulic clutch includes:

[0056] S201, Disassemble the internal structure of the hydraulic clutch and check for any abnormalities such as poor hydraulic clutch oil leakage or short test intervals. Verify whether the abnormalities lead to excessive oil accumulation. If it is related to poor hydraulic clutch oil leakage, proceed to S202; otherwise, proceed to S203.

[0057] S202, check whether the hydraulic clutch oil leakage is related to the elastic plate valve. If so, record the fault point and verify whether it causes the oil leakage. Otherwise, check whether the oil leakage is related to the size of the housing oil leakage hole or the clutch test flow. If so, record the fault point and verify whether it causes the oil leakage. Otherwise, proceed to S203.

[0058] Among the checks, determine if the hydraulic clutch oil leakage is related to the elastic plate valve. If so, record the fault point, including:

[0059] Check if the elastic sheet has too low a hardness. If so, record the fault point X2.

[0060] Check if the spring plate radius is too large. If so, record the fault point X3.

[0061] Check if the spring elasticity is too low. If so, record the fault point X4.

[0062] Check if the poor oil flow is related to the size of the oil leak hole in the housing or the clutch test flow rate. If so, record the fault point and verify whether it caused the poor oil flow, including:

[0063] Check if the poor oil leakage is related to the small size of the oil leakage hole in the housing. If so, record the fault point X5.

[0064] Check if the poor oil flow is related to the low test flow of the clutch. If so, record the fault point X6.

[0065] S203, conduct a simulated test of the hydraulic clutch test interval time, check for any abnormalities and verify whether the length of the interval is related to poor oil leakage. If so, record the fault point X7; otherwise, investigate the fault points of other structures.

[0066] Troubleshooting the reducer includes:

[0067] S301, check whether the reducer lubricating oil is leaking into the clutch: check whether it is related to poor ball surface sealing. If so, proceed to S302; otherwise, proceed to S303.

[0068] S302, check if the reducer lubricating oil is related to the sealing of the spherical parts. If so, record the fault point; otherwise, proceed to S303.

[0069] This includes checking whether the reducer lubricating oil is related to the sealing performance of the spherical parts, including:

[0070] Check if the spherical surface fit is poor; if so, record the fault point X8.

[0071] Check if the spherical contact width is too small. If so, record the fault point X9.

[0072] Check for poor spherical contact. If so, conduct a detailed inspection, including:

[0073] Check if the axial dimension of the spherical part is deviated. If so, record the fault point X10.

[0074] Check if the spring mounting bracket is not properly supported. If so, record the fault point X11.

[0075] Check if the elastic dimension performance deviates. If so, record the fault point X12.

[0076] Check if the static balance is poor and the vibration is large. If so, record the fault point X13. Otherwise, check the fault points of other structures.

[0077] S303, check if the lubricating oil in the reducer has a large clearance between the hydraulic clutch drain pipe and the gear shaft. If so, record the fault point X14; otherwise, check for fault points in other structures.

[0078] Troubleshooting the left and right housings of the hydraulic clutch includes:

[0079] S401, check if there is any jamming in the left and right housings of the hydraulic clutch. If so, proceed to S402; otherwise, after eliminating the cause of this fault, proceed to SS3.

[0080] S402, check if the hydraulic clutch housing fit dimensions are off. If so, record the fault point X15; otherwise, proceed to S403.

[0081] S403, check if any foreign objects have entered the hydraulic clutch mating surface. If so, record the fault point X16; otherwise, proceed to SS3.

[0082] If the fault cannot be found after checking all structures, the entire structure will be checked again until the fault is found.

[0083] SS3: Take corresponding measures to eliminate the fault based on the recorded fault points.

[0084] This invention discloses a method for locating faults related to premature engagement of hydraulic clutches. It involves conducting troubleshooting simulation tests on premature engagement faults in hydraulic clutches, summarizing the testing methods, drawing a fault tree, and systematically checking each fault. This method can scientifically and systematically identify the causes of premature engagement faults in hydraulic clutches quickly and efficiently. While improving the accuracy of fault diagnosis, it reduces excessive reliance on operator experience in troubleshooting analysis and location, avoids repetitive and disordered work, and reduces troubleshooting cycle and costs. Through the formulation of improvement measures, trial runs have verified its good results, significantly reducing the failure rate and greatly improving production delivery efficiency. This method is currently being applied in practical work.

[0085] The hydraulic clutch components of a certain starter were disassembled and inspected, and the relevant fault factors were investigated.

[0086] X1: Fuel pump delivers fuel in advance

[0087] After the turbocharger starter hydraulic clutch engaged prematurely, the fuel pump oil supply signal was measured and found to be normal. Therefore, the premature clutch engagement fault is unrelated to the fuel pump.

[0088] (2) X2: The spring sheet has low hardness.

[0089] Five new spring sheets were randomly selected and sent to the material testing center to measure the valve hardness. The measurement results are shown in Table 1. The spring sheet hardness is qualified, so this factor can be ruled out.

[0090] Table 1. Retest values ​​of spring sheet hardness

[0091]

[0092] (3) X3: The arc diameter of the spring sheet is too large.

[0093] The spring plate arc diameter was measured using a measuring tool. The spring plates removed from the new hydraulic clutch without the starter motor and the spring plates from the faulty machine were retested. The measurement results showed that the spring plate arc diameters varied. A smaller arc diameter was more likely to cause oil leakage and the hydraulic clutch would not engage prematurely. Although the arc diameters of the spring plates in the two faulty machines were smaller, the faults still occurred. Therefore, it was determined that the size of the spring plate arc diameter was not related to the fault.

[0094] (4) X4: The spring sheet has low elasticity.

[0095] Clamp one end of the spring sheet with a newly made tooling and measure the spring force at the other end of the spring sheet under different compressions on a spring force gauge. The test objects are spring sheets from faulty machines and spring sheets removed from new hydraulic clutches that have never been fitted with starters.

[0096] Table 2. Measured values ​​of spring sheet elasticity

[0097]

[0098] As shown in Table 2, the spring sheets from the faulty batch have a lower elastic coefficient than those from the new batch. The lower elastic coefficient makes it easier for the spring sheets to stick to the hydraulic clutch housing or reduce the gap between them when subjected to centrifugal force during operation. This makes it difficult for the lubricating oil in the hydraulic clutch to flow out, increasing the probability of failure. Therefore, the low elastic coefficient of the spring sheets is related to this failure.

[0099] (5) X5: The size of the oil drain hole in the casing is too small.

[0100] The dimensions related to the size of the hydraulic clutch housing and the oil drain channel were remeasured. The dimensions were found to be within acceptable limits, so this factor can be ruled out.

[0101] (6) X6: The leakage of the hydraulic clutch housing is too small.

[0102] The design requirement for the leakage of the hydraulic clutch housing is ≤90 cm3 / min. The leakage of the hydraulic clutch housing of the retest starter is greater than 90 cm3 / min. There is no phenomenon of insufficient leakage, so this factor can be ruled out.

[0103] (7) X7: Short test interval

[0104] If the interval between two test runs is short, the lubricating oil in the hydraulic clutch may not have been completely drained after the last stop, causing premature engagement during the next test run due to oil buildup. Checking the test run records, the test run operation met the requirements, therefore the short interval factor can be ruled out.

[0105] (8) X8: Low spherical fit

[0106] A colorimetric inspection was performed on the spherical surfaces of the faulty machine. The coloring test revealed that the spherical surfaces of the bushing and gear shaft were within acceptable limits, but the coloring of the pipe and bushing was unacceptable, showing a circumferential discontinuity, which could lead to lubricating oil leakage. Therefore, this factor is not the primary cause of the fault and can be ruled out.

[0107] (9) X9: The spherical contact width is too small

[0108] The adapter bushing, intermediate gear, and oil drain pipe were measured and tested in sequence. If the dimensions were found to be qualified, this factor can be ruled out.

[0109] (10) X10: Deviation of axial dimension of spherical part

[0110] The axial dimensions of the oil drain pipe, adapter bushing, and intermediate gear on the starter hydraulic clutch, as well as the spherical position and clamping, were re-measured. The measurement results were all qualified, and the deviation factors of the axial dimensions of the spherical parts could be eliminated.

[0111] (12) X12: Spring size and performance deviation

[0112] Upon re-inspection, the spring dimensions were found to be within acceptable limits, thus this item can be ruled out.

[0113] (13)X13: Static balance of the left and right housings of the hydraulic clutch

[0114] The static balance of the two rotating components, left and right housings, of the faulty hydraulic clutch was retested. The static balance measurement showed it was substandard. During operation, vibration can easily cause unstable clamping between the oil drain pipe and the spherical surface of the adapter bushing, and between the adapter bushing and the spherical surface of the intermediate gear, leading to poor spherical sealing and premature entry of lubricating oil into the hydraulic clutch. However, based on the testing process, the static imbalance was small, and this factor was not the main cause of this fault.

[0115] (14) X14: The clearance between the outer diameter of the oil drain pipe and the inner hole of the gear shaft is large.

[0116] The outer diameter of the drain pipe was re-measured, and the inner hole of the intermediate gear (gear shaft) was re-measured. The test results are shown in Table 3.

[0117] Table 3. Remeasured values ​​of the outer diameter of the oil drain pipe and the inner diameter of the gear shaft

[0118]

[0119] As shown in Table 3, the outer diameter and surface roughness of the oil drain pipe are qualified, and the bore diameter of the intermediate gear is qualified, so this factor can be ruled out. Therefore, the clearance factor between the outer diameter of the oil drain pipe and the inner bore of the gear shaft can be eliminated.

[0120] (15) X15: Dimensional deviation of hydraulic clutch housing

[0121] The assembly dimensions of the hydraulic clutch housing before the test run were reviewed (Table 4). All relevant mating dimensions met the design requirements, so this factor can be eliminated.

[0122] Table 4 Assembly Dimensions of Hydraulic Clutch Housing

[0123]

[0124] (16) X16: Foreign object enters the mating surface of the hydraulic clutch

[0125] Disassembly and inspection revealed no wear on the hydraulic clutch mating surfaces, so this factor can be ruled out.

[0126] To address faults caused by low spring constant, the following measures are taken:

[0127] The spring sheet elastic coefficient was measured and grouped, and the spring sheet arc diameter and thickness were controlled. The spring sheets were grouped and stored according to their elastic coefficient, and targeted selection was made during the assembly of the hydraulic clutch cover, which reduced the workload and ensured the reliability of the product.

[0128] The distribution range of the spring plate elastic coefficient is statistically analyzed to improve measurement requirements. Appropriate spring plates are selected, the tolerance range of the spring plate arc diameter is narrowed, and the spring plate gap is increased to facilitate the adjustment of the hydraulic test flow of the housing and eliminate and prevent premature failure of the starter hydraulic clutch.

[0129] The above description is merely a preferred embodiment of the present invention and is not intended to limit the technical solution of the present invention in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. A method for locating faults caused by premature engagement of a hydraulic clutch, characterized in that, include: SS1 collects fault information and draws a fault tree for early engagement of the hydraulic clutch based on the fault type; SS2, according to the fault tree, conduct a simulation test on the fault of premature engagement of the hydraulic clutch, check the fault points of the fuel pump, hydraulic clutch, reducer and the left and right housings of the hydraulic clutch one by one, and record the fault points. If the fault cannot be found after checking all structures, check all structures again until the fault is found. Troubleshooting the fuel pump includes checking if it is supplying fuel prematurely; if so, record the fault as X1; otherwise, check for faults in other components. Troubleshooting the hydraulic clutch includes: S201, Disassemble the internal structure of the hydraulic clutch and check for any abnormalities such as poor hydraulic clutch oil leakage or short test intervals. Verify whether the abnormalities lead to excessive oil accumulation. If it is related to poor hydraulic clutch oil leakage, proceed to S202; otherwise, proceed to S203. S202, check whether the hydraulic clutch oil leakage is related to the elastic plate valve. If so, record the fault point and verify whether it causes the oil leakage. Otherwise, check whether the oil leakage is related to the size of the housing oil leakage hole or the clutch test flow. If so, record the fault point and verify whether it causes the oil leakage. Otherwise, proceed to S203. S203, conduct a simulated test of the hydraulic clutch test interval time, check for any abnormalities and verify whether the length of the interval is related to poor oil leakage. If so, record the fault point X7; otherwise, investigate the fault points of other structures.

2. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 1, characterized in that, In S202, check whether the hydraulic clutch oil leakage is related to the elastic plate valve. If so, record the fault point, including: Check if the elastic sheet has too low a hardness. If so, record the fault point X2. Check if the spring plate radius is too large. If so, record the fault point X3. Check if the spring elasticity is too low. If so, record the fault point X4.

3. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 1, characterized in that, In S202, check whether the poor oil leakage is related to the size of the oil leakage hole in the housing or the clutch test flow rate. If so, record the fault point and verify whether it causes the poor oil leakage, including: Check if the poor oil leakage is related to the small size of the oil leakage hole in the housing. If so, record the fault point X5. Check if the poor oil flow is related to the low test flow of the clutch. If so, record the fault point X6.

4. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 1, characterized in that, In SS2, troubleshooting the reducer includes: S301, check whether the reducer lubricating oil is leaking into the clutch: check whether it is related to poor ball surface sealing. If so, proceed to S302; otherwise, proceed to S303. S302, check if the reducer lubricating oil is related to the sealing of the spherical parts. If so, record the fault point; otherwise, proceed to S303. S303, check if the reducer lubricating oil is related to the clearance between the hydraulic clutch drain pipe and the gear shaft. If so, record the fault point X14; otherwise, troubleshoot other structural fault points.

5. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 4, characterized in that, In S302, the check of whether the reducer lubricating oil is related to the sealing performance of the spherical parts includes: Check if the spherical surface fit is poor; if so, record the fault point X8. Check if the spherical contact width is too small. If so, record the fault point X9. Check for poor spherical contact; if so, conduct a detailed inspection.

6. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 5, characterized in that, Check for poor spherical contact, including: Check if the axial dimension of the spherical part is deviated. If so, record the fault point X10. Check if the spring mounting bracket is not properly supported. If so, record the fault point X11. Check if the elastic dimension performance deviates. If so, record the fault point X12. Check if the static balance is poor and the vibration is large. If so, record the fault point X13. Otherwise, check the fault points of other structures.

7. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 1, characterized in that, In SS2, troubleshooting is performed on the left and right housings of the hydraulic clutch, including: S401, check if there is any jamming in the left and right housings of the hydraulic clutch. If so, proceed to S402; otherwise, after eliminating the cause of this fault, proceed to SS3. S402, check if the hydraulic clutch housing fit dimensions are off. If so, record the fault point X15; otherwise, proceed to S403. S403, check if any foreign objects have entered the hydraulic clutch mating surface. If so, record the fault point X16; otherwise, proceed to SS3.

8. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 1, characterized in that, It also includes SS3, which takes corresponding measures to eliminate faults based on the recorded fault points.

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