An intelligent diagnosis method, device and system for abnormal inlet pressure of locomotive diesel engine oil

Abstract

An intelligent diagnosis method for abnormal inlet pressure of locomotive diesel engine oil includes the following steps: obtaining the numerical values of diesel engine oil inlet pressure, diesel engine speed, oil temperature, high-temperature water temperature, and oil pump outlet pressure signal; when the diesel engine oil is at a certain speed and the oil inlet pressure Pin < the low threshold value ΔPin of the oil inlet pressure at this speed and lasts for a certain period of time, it is determined that there is an abnormality in the oil inlet pressure; when there is an abnormality in the oil inlet pressure, based on the numerical values of the oil temperature, high-temperature water temperature, and oil pump outlet pressure signal, a method of comparing the oil pump outlet pressure, oil temperature, and high-temperature water temperature with their respective threshold values in sequence is used to judge the fault causes that lead to the oil pump inlet pressure, realize the intelligent diagnosis of the abnormal oil pressure, clarify the reasons for the abnormal pressure and the fault location, provide targeted operation and maintenance suggestions, and display them in the on-vehicle diagnosis system, thereby improving the efficiency of operation and maintenance and repair.

Description

Technical Field

[0001] The present invention belongs to the technical field of diesel engines, and relates to an intelligent diagnosis method, device and system for abnormal oil inlet pressure of locomotive diesel engines. Background Technique

[0002] As the lubricating and cooling medium of diesel engines, engine oil is an indispensable lubricant and coolant for moving parts such as the crankshaft, camshaft, transmission gears, power unit, and supercharger of diesel engines. The engine oil system provides engine oil with a certain pressure, temperature, and flow rate to the surfaces of various moving friction pairs inside the diesel engine, playing roles such as lubrication, reducing friction, cooling and heat dissipation. Among them, the oil inlet pressure is a key indicator of the health of the diesel engine oil system. Too low oil inlet pressure will make it difficult to establish an oil film for moving pairs, the surfaces of friction pairs cannot be well lubricated, the cooling effect of high-temperature moving parts is poor, and in severe cases, major mechanical failures such as cylinder scoring, bearing shell crushing, supercharger and crankshaft bearing burnout will occur. Therefore, it is necessary to strengthen the monitoring, protection and fault diagnosis of the oil inlet pressure.

[0003] With the development of technologies such as sensor technology, big data technology, intelligent diagnosis, and embedded systems, the health diagnosis of diesel engine oil systems is also developing towards the direction of intelligence and systematization.

[0004] Designing an intelligent diagnosis method for abnormal oil inlet pressure according to the characteristics of the locomotive diesel engine oil system is one of the key technologies for preventing oil system failures, clarifying the causes of failures, and improving the efficiency of maintenance and operation and maintenance.

[0005] At present, most locomotive diesel engine oil pressures only have basic signal acquisition and pressure threshold protection functions. Some diesel engine units and oil systems are gradually starting to develop towards intelligent diagnosis, but there is no complete intelligent diagnosis function for oil pressure.

[0006] The current disadvantages of locomotive diesel engine oil pressure diagnosis technology are as follows:

[0007] 1) The setting of the oil pressure protection value is single, lacking a comprehensive diagnosis of the oil system. It is difficult to diagnose the cause of the failure after the oil pressure is abnormal. In most cases, only traditional manual experience can be relied on for cause analysis, and the timeliness is poor.

[0008] 2) Some diesel engine units and oil systems have begun to establish an intelligent fault diagnosis system, but most of them only describe the overall structure and function of the diagnosis system, and there is no specific diagnosis method targeted, and this part is the core and difficulty of intelligent diagnosis. Summary of the Invention

[0009] In order to solve the above problems, the technical solution adopted by the present invention is: an intelligent diagnosis method for abnormal oil inlet pressure of locomotive diesel engines, including the following steps:

[0010] Obtain the numerical values of the diesel engine oil inlet pressure, diesel engine speed, oil temperature, high-temperature water temperature, and oil pump outlet pressure signal;

[0011] When the diesel engine oil is at a certain speed, the oil inlet pressure P in <The low threshold value of the oil inlet pressure at this speed, ΔP in And after a certain period of time, it is determined that there is an abnormality in the oil inlet pressure;

[0012] When there is an abnormality in the oil inlet pressure, based on the numerical values of the oil temperature, high-temperature water temperature, and oil pump outlet pressure signal, a method of comparing the oil pump outlet pressure, oil temperature, and high-temperature water temperature with their respective threshold values in sequence is used to judge the cause of the failure of the oil pump inlet pressure.

[0013] Furthermore: The process of judging the cause of the failure of the oil inlet pressure by using the method of comparing the oil pump outlet pressure, oil temperature, and high-temperature water temperature with their respective threshold values in sequence when there is an abnormality in the oil inlet pressure is as follows:

[0014] Based on the obtained numerical value of the oil pump outlet pressure signal, judge the relationship between the oil pump outlet pressure and the low threshold value of the outlet pressure:

[0015] When the oil pump outlet pressure < the set low threshold value of the pressure, ΔP out Then, judge whether the oil temperature T oin Exceeds the set high threshold value of the oil temperature, ΔT oin ;

[0016] When the oil pump outlet pressure ≥ the set low threshold value of the pressure, ΔP out Then, judge whether the oil temperature T oin Exceeds the set high threshold value of the oil temperature, ΔT oin .

[0017] Furthermore, when the oil pump outlet pressure < the set low threshold value of the pressure, ΔP out Then, judge whether the oil temperature T oin Is higher than the set high threshold value of the oil temperature, ΔT oin The process is as follows:

[0018] When the oil temperature ≥ the set high threshold value of the oil temperature, ΔT oin , then judge the relationship between the high-temperature water temperature T win And the set high-temperature water temperature threshold value, ΔT win :

[0019] When the oil temperature < the set high threshold value of the oil temperature, ΔT oin , then judge the oil pump outlet pressure P outDetermine whether it belongs to a sudden drop situation to judge the cause of the failure.

[0020] Further, when the engine oil temperature < the set high threshold value of engine oil temperature ΔT oin , then for the outlet pressure P of the oil pump out , the process of determining whether it belongs to a sudden drop situation to judge the cause of the failure is as follows:

[0021] When the outlet pressure of the oil pump belongs to a sudden drop situation, judge that the cause of the failure is: engine oil dilution, emulsification or abnormal engine oil constant pressure valve. The operation and maintenance suggestion is: when driving, if the inlet pressure of the engine oil is higher than the safety threshold value, observe the operation, otherwise stop the machine; during maintenance, check the engine oil level and the state of the engine oil constant pressure valve in sequence.

[0022] When the outlet pressure of the oil pump does not belong to a sudden drop, judge that the cause of the failure is: abnormal engine oil level, deterioration of engine oil quality or oil pump failure, and give the operation and maintenance suggestion: when driving, if the inlet pressure of the engine oil is higher than the safety threshold value, observe the operation, otherwise stop the machine; during maintenance, check the engine oil level, the state of the engine oil and the oil pump in sequence.

[0023] Further, when the outlet pressure of the oil pump ≥ the set low threshold value of pressure ΔP out , then judge whether the engine oil temperature T oin is higher than the set high threshold value of engine oil temperature ΔT oin as follows:

[0024] When the engine oil temperature ≥ the set high threshold value of engine oil temperature ΔT oin , then judge the relationship between the high-temperature water temperature T win and the set high-temperature water temperature threshold value ΔT win :

[0025] When the engine oil temperature < the set high threshold value of engine oil temperature ΔT oin , then judge whether the inlet pressure P of the engine oil in belongs to a sudden drop situation to judge the cause of the failure.

[0026] Further, when the engine oil temperature < the set high threshold value of engine oil temperature ΔT oin , then judge whether the inlet pressure P of the engine oil in belongs to a sudden drop situation to judge the cause of the failure as follows;

[0027] When the inlet pressure of the engine oil belongs to a sudden drop situation, judge that the cause of the failure is: pipeline leakage or abnormal moving pair. The operation and maintenance suggestion: when driving, if the inlet pressure of the engine oil is higher than the safety threshold value, observe the operation, otherwise stop the machine; during maintenance, check the engine oil level, the quality of the engine oil and the diesel engine moving parts in sequence.

[0028] When the engine oil inlet pressure does not belong to the sudden drop situation, the fault causes are judged as: low engine oil level, deteriorated engine oil quality or blocked engine oil filter. Maintenance suggestion: When driving, if the engine oil inlet pressure is higher than the safety threshold, observe the operation; otherwise, stop the machine. During maintenance, check the engine oil level, engine oil quality, status of the engine oil filter and moving parts of the diesel engine in sequence.

[0029] Further, when the engine oil temperature ≥ the set high threshold ΔT of the engine oil temperature oin , then the process of judging the relationship between the high temperature water temperature T win and the set high threshold ΔT of the high temperature water temperature is as follows: win

[0030] When the high temperature water temperature ≥ the set high threshold ΔT of the high temperature water temperature win , then the fault causes are judged as: poor heat dissipation of the locomotive cooling water. Maintenance suggestion: Observe the operation when driving. During maintenance, check the cooling system components such as the locomotive cooling fan, contactor, cooling water pipeline, louver, and radiator single section in sequence;

[0031] When the high temperature water temperature < the set high threshold ΔT of the high temperature water temperature win , then the fault cause is judged as: poor engine oil heat exchange system. Maintenance suggestion: Observe the operation when driving. During maintenance, check the engine oil heat exchanger and engine oil pipeline in sequence.

[0032] Further, it also includes an alarm prompt for abnormal engine oil inlet pressure.

[0033] An intelligent diagnosis device for abnormal engine oil inlet pressure of a locomotive diesel engine includes

[0034] An acquisition module: used to acquire the signal values of the engine oil inlet pressure, diesel engine speed, engine oil temperature, high temperature water temperature, and engine oil pump outlet pressure of the diesel engine;

[0035] A judgment module: used to judge that the engine oil inlet pressure is abnormal when, at a certain speed of the diesel engine, the engine oil inlet pressure P in < the low threshold ΔP of the engine oil inlet pressure at this speed in and after a certain period of time;

[0036] A fault cause diagnosis module: used to judge the fault cause of the engine oil pump inlet pressure by comparing the engine oil pump outlet pressure, engine oil temperature, and high temperature water temperature with their respective thresholds in sequence when the engine oil inlet pressure is abnormal;

[0037] An alarm module: used to give an alarm prompt for abnormal engine oil inlet pressure.

[0038] An intelligent diagnosis system for abnormal oil inlet pressure of a locomotive diesel engine, characterized in that it includes a signal acquisition module for collecting oil inlet pressure, diesel engine oil speed, oil temperature, high-temperature water temperature, and oil pump outlet pressure;

[0039] Based on the oil inlet pressure, diesel engine oil speed, oil temperature, high-temperature water temperature, and oil pump outlet pressure collected by the signal acquisition module, an intelligent diagnosis device for abnormal oil inlet pressure of the locomotive diesel engine is used to judge the cause of the fault causing the oil inlet pressure;

[0040] A vehicle-mounted operation and maintenance display terminal for displaying the cause of the fault, operation and maintenance suggestions, and early warning prompts of the intelligent diagnosis device.

[0041] An intelligent diagnosis method, device, and system for abnormal oil inlet pressure of a locomotive diesel engine provided by the present invention, combined with the characteristics of the locomotive oil system, builds a specific and detailed intelligent diagnosis method for abnormal diesel engine oil pressure, realizes intelligent diagnosis of abnormal oil pressure, clarifies the cause of pressure abnormality and fault location, provides targeted operation and maintenance suggestions, and displays them in the vehicle-mounted diagnosis system, thereby improving the efficiency of operation and maintenance and repair. Brief Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 It is a structural diagram of the locomotive oil system;

[0044] Figure 2 It is a flowchart of an intelligent diagnosis method for abnormal oil inlet pressure of a locomotive diesel engine;

[0045] Figure 3 It is a schematic diagram of the software and hardware system of the intelligent diagnosis system for abnormal oil pressure of a locomotive diesel engine. Detailed Embodiments

[0046] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The following will refer to the drawings and combine the embodiments to detail the present invention.

[0047] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0049] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0050] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present invention. The orientation words "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0051] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figure for the device. For example, if the device in the figure is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0052] In addition, it should be noted that using terms such as "first", "second" to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, so they should not be construed as limiting the protection scope of the present invention.

[0053] Figure 1 is the structural diagram of the locomotive oil system;

[0054] Figure 2 is the schematic diagram of the software and hardware system of the locomotive diesel engine oil pressure abnormal intelligent diagnosis system;

[0055] An intelligent diagnosis method for abnormal oil inlet pressure of a locomotive diesel engine includes the following steps:

[0056] S1: Obtain the signal values of the diesel engine oil inlet pressure, diesel engine speed, oil temperature, high-temperature water temperature, and oil pump outlet pressure;

[0057] S2: When the diesel engine oil is running at a certain speed n, the oil inlet pressure P in <the low threshold value ΔP of the oil inlet pressure at this speed in and after lasting for a certain time, it is determined that the oil inlet pressure is abnormal;

[0058] The said certain time refers to the time when the actual pressure continuously remains lower than the low threshold value, usually referring to the delay time, which can be designed with different times according to the characteristics of different diesel engines. The said certain time is generally set to 45 seconds.

[0059] The low threshold value ΔP of the oil inlet pressure in can be adaptively adjusted according to the characteristics of the oil systems of different locomotive diesel engines.

[0060] This method first designs an abnormal alarm for the oil inlet pressure. The abnormal alarm is mainly for the low threshold of the oil inlet pressure at different diesel engine speeds. A curve of diesel engine speed - low threshold of oil inlet pressure can be designed, such as Table 1, or an adaptive design can be carried out according to the characteristics of different diesel engine oil pressure systems.

[0061] Table 1 Example table of the low threshold curve of the diesel engine oil inlet pressure

[0062]

[0063]

[0064] S3: When an abnormal oil inlet pressure triggers an abnormal alarm, based on the oil temperature, high-temperature water temperature, and the numerical value of the oil pump outlet pressure signal, a method of comparing the oil pump outlet pressure, oil temperature, and high-temperature water temperature with their respective thresholds in sequence is used to judge the cause of the fault that causes the oil pump inlet pressure.

[0065] S4: Give an alarm prompt for the situation of abnormal oil inlet pressure.

[0066] Steps S1 / S2 / S3 / S4 are executed in sequence;

[0067] When the oil inlet pressure is abnormal, the process of using the method of comparing the oil pump outlet pressure, oil temperature, and high-temperature water temperature with their respective thresholds in sequence to judge the cause of the fault that causes the oil inlet pressure is as follows:

[0068] a. After the abnormal alarm is triggered by the oil inlet pressure, based on obtaining the numerical value of the oil pump outlet pressure P out signal, judge the relationship between the oil pump outlet pressure and the low threshold of the outlet pressure ΔP out : (The oil inlet pressure is the pressure at which the oil reaches the oil diesel engine inlet after being pressurized by the oil pump and passing through the oil pipeline, oil heat exchanger, and oil filter (see Figure 1 ), so the oil pump outlet pressure is the source of the oil inlet pressure)

[0069] a.1 When the oil pump outlet pressure < the set low threshold of pressure ΔP out ), then judge whether the oil temperature T oin is higher than the set high threshold of oil temperature ΔT oin ; As the oil temperature rises, the oil viscosity decreases, and the oil pump outlet pressure also decreases accordingly;

[0070] When the oil pump outlet pressure < the set low threshold of pressure ΔP out ), then judge whether the oil temperature T oin is higher than the set high threshold of oil temperature ΔToin The process is as follows.

[0071] a.1.1 When the engine oil temperature ≥ the set high threshold ΔT of the engine oil temperature oin , then the relationship between the high-temperature water temperature T win and the set high threshold ΔT of the high-temperature water temperature win is judged: (The diesel engine oil is cooled in the locomotive engine oil heat exchanger, and the cooling medium of the heat exchanger is high-temperature water. Therefore, the temperature of the high-temperature water and the heat transfer efficiency of the heat exchanger determine the cooling effect of the engine oil).

[0072] a.1.1.1 If the high-temperature water temperature ≥ the set high threshold ΔT of the high-temperature water temperature win (the cooling medium of the engine oil heat exchanger is cooled by the locomotive cooling water cooling system), it is judged that the root cause of the fault is poor heat dissipation of the locomotive cooling water, and operation and maintenance suggestions are given: Observe the operation during driving, and check the cooling system components such as the locomotive cooling fan, contactor, cooling water pipeline, shutter, and radiator section in turn during maintenance.

[0073] a.1.1.2 If the high-temperature water temperature < the set high threshold ΔT of the high-temperature water temperature win , it is judged that the root cause of the fault is: poor engine oil heat exchange system, and operation and maintenance suggestions are given: Observe the operation during driving, and check the engine oil heat exchanger and engine oil pipeline in turn during maintenance.

[0074] a.1.2 When the engine oil temperature < the set high threshold ΔT of the engine oil temperature oin , then whether the outlet pressure P of the oil pump out belongs to a sudden drop situation is judged to determine the cause of the fault.

[0075] When the engine oil temperature < the set high threshold ΔT of the engine oil temperature oin , then whether the outlet pressure P of the oil pump out belongs to a sudden drop situation is judged to determine the cause of the fault, and the process is as follows;

[0076] Engine oil pollution, dilution, and emulsification can all cause a sudden drop in engine oil pressure. The sudden drop can be judged according to the pressure drop trend before and after the pressure alarm. The specific trend algorithm can use the gradient function;

[0077] a.1.2.1 If the outlet pressure of the oil pump belongs to a sudden drop situation, it is judged that the root cause of the fault is engine oil dilution, emulsification, or abnormal engine oil constant pressure valve, and operation and maintenance suggestions are given: If the engine oil inlet pressure is higher than the safety threshold during driving, observe the operation, otherwise stop the machine; Check the engine oil level and the state of the engine oil constant pressure valve in turn during maintenance.

[0078] a.1.2.2 If the outlet pressure of the oil pump does not suddenly drop, it is judged that the root cause of the fault is abnormal oil level, deteriorated oil quality or oil pump failure, and operation and maintenance suggestions are given: When driving, if the inlet pressure of the oil is higher than the safety threshold, observe the operation; otherwise, stop the machine. During maintenance, check the oil level, oil condition and oil pump in sequence.

[0079] a.2 If the outlet pressure of the oil pump ≥ the set low pressure threshold ΔP out , the system automatically switches to judging the oil temperature T oin whether it exceeds the set high oil temperature threshold ΔT oin .

[0080] a.2.1 If the oil temperature ≥ the set high oil temperature threshold ΔT oin , the system automatically switches to the high temperature water temperature T win to determine whether it is higher than the set high temperature water temperature threshold ΔT win (Judgment is made again on the oil temperature before determining that the outlet pressure of the oil pump is normal according to the characteristics of the diesel engine oil cooling system).

[0081] a.2.1.1 If the high temperature water temperature ≥ the set high temperature water temperature threshold ΔT win (the cooling medium of the oil heat exchanger is cooled by the locomotive cooling water cooling system), the system automatically identifies that the root cause of the fault is poor heat dissipation of the locomotive cooling water, and gives operation and maintenance suggestions: Observe the operation when driving, and during maintenance, check the cooling system components such as the locomotive cooling fan, contactor, cooling water pipeline, shutter, and heat dissipation single section in sequence.

[0082] a.2.1.2 If the high temperature water temperature < the set high temperature water temperature threshold ΔT win , the system automatically identifies that the root cause of the fault is poor oil heat exchange system, and gives operation and maintenance suggestions: Observe the operation when driving, and during maintenance, check the oil heat exchanger and oil pipeline in sequence.

[0083] a.2.2 If the oil temperature < the high oil temperature threshold ΔT oin , it automatically switches to judging whether the inlet pressure P of the oil in is in a sudden drop situation (pipe leakage or abnormal wear of the friction pair of diesel engine moving parts can cause a sudden drop in the inlet pressure of the oil. The sudden drop in the inlet pressure can be judged according to the pressure drop trend before and after the alarm. The specific trend algorithm can use the gradient function).

[0084] a.2.2.1 If the inlet pressure of the oil belongs to a sudden drop, it is judged that the root cause of the fault is pipe leakage or abnormal moving pair, and operation and maintenance suggestions are given: When driving, if the inlet pressure of the oil is higher than the safety threshold, observe the operation; otherwise, stop the machine. During maintenance, check the oil level, oil quality and diesel engine moving parts in sequence.

[0085] a.2.2.2 If the oil inlet pressure does not drop suddenly, it is judged that the root cause of the fault is low oil level, deteriorated oil quality or blocked oil filter, and operation and maintenance suggestions are given: When the oil inlet pressure is higher than the safety threshold during driving, observe the operation; otherwise, stop the machine. During maintenance, check the oil level, oil quality, status of the oil filter, and moving parts of the diesel engine in sequence.

[0086] The above is based on having Figure 3 a description of an intelligent diagnosis method for abnormal oil inlet pressure of the locomotive diesel engine oil system, in which the set thresholds and trend algorithms involved can be adaptively adjusted according to the structural characteristics of different locomotives and diesel engines.

[0087] An intelligent diagnosis device for abnormal oil inlet pressure of a locomotive diesel engine includes

[0088] An acquisition module: used to acquire the numerical values of the oil inlet pressure of the diesel engine, diesel engine speed, oil temperature, high-temperature water temperature, and oil pump outlet pressure signal;

[0089] A judgment module: used to judge that there is an abnormality in the oil inlet pressure when, at a certain speed of the diesel engine oil, the oil inlet pressure P in <the low threshold value ΔP of the oil inlet pressure at this speed in and after a certain period of time, it is judged that there is an abnormality in the oil inlet pressure;

[0090] A fault cause diagnosis module: used to judge the fault cause of the oil pump inlet pressure by comparing the oil pump outlet pressure, oil temperature, and high-temperature water temperature with their respective threshold values in sequence when there is an abnormality in the oil inlet pressure.

[0091] An alarm module: used to give an alarm prompt for the situation of abnormal oil inlet pressure.

[0092] Figure 3 is a schematic diagram of the software and hardware system of the intelligent diagnosis system for abnormal oil pressure of the locomotive diesel engine.

[0093] An intelligent diagnosis system for abnormal oil inlet pressure of a locomotive diesel engine,

[0094] This system includes a signal acquisition module that collects signals for the oil inlet pressure, diesel engine oil speed, oil temperature, high-temperature water temperature, and oil pump outlet pressure;

[0095] Build a locomotive diesel engine record data acquisition terminal to automatically collect relevant information. This data acquisition terminal includes sensors installed on the diesel engine and a signal acquisition module for sensor signal conversion and transmission. To implement this method, the data collected by the signal acquisition module should include information such as oil inlet pressure, diesel engine speed, oil pump outlet pressure, oil temperature, and high-temperature water temperature.

[0096] Based on the engine oil inlet pressure, diesel engine speed, engine oil temperature, high-temperature water temperature, and engine oil pump outlet pressure collected by the signal acquisition module, an intelligent diagnosis device for abnormal engine oil inlet pressure of a locomotive diesel engine is used to judge the fault causes of the engine oil pump inlet pressure;

[0097] The system can adopt servers with large-capacity data storage functions, software and hardware or other devices with signal receiving, processing, and analysis capabilities. For the convenience of transplantation and expansion, the system can adopt a modular or distributed architecture, and the program modules between data communication, pressure anomaly alarm diagnosis methods, and pressure anomaly intelligent diagnosis methods can be independent of each other but can call each other;

[0098] An on-vehicle operation and maintenance display terminal for displaying the fault causes, operation and maintenance suggestions, and early warning prompts of the intelligent diagnosis device.

[0099] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An intelligent diagnosis method for abnormal inlet pressure of locomotive diesel engine oil, characterized in that: Including the following steps: Obtain the signal values of the diesel engine oil inlet pressure, diesel engine speed, oil temperature, high-temperature water temperature, and oil pump outlet pressure; When the diesel engine oil is at a certain rotational speed, the oil inlet pressure P in <is lower than the low threshold value ΔP of the oil inlet pressure at this rotational speed in and after a certain period of time, it is determined that there is an abnormality in the oil inlet pressure; When the oil inlet pressure is abnormal, based on the oil temperature, high-temperature water temperature, and oil pump outlet pressure signal values, use the method of comparing the oil pump outlet pressure, oil temperature, and high-temperature water temperature with their respective thresholds in sequence to judge the fault causes of the oil pump inlet pressure; The process of using the method of comparing the oil pump outlet pressure, oil temperature, and high-temperature water temperature with their respective thresholds in sequence to judge the fault causes of the oil inlet pressure when the oil inlet pressure is abnormal is as follows: Based on the obtained oil pump outlet pressure signal value, judge the relationship between the oil pump outlet pressure and the low threshold of the outlet pressure; When the oil pump outlet pressure < the set low pressure threshold ΔP out then determine whether the oil temperature T oin exceeds the set high oil temperature threshold ΔT oin ; When the oil pump outlet pressure ≥ the set low pressure threshold ΔP out then judge the oil temperature T oin whether it exceeds the set high oil temperature threshold ΔT oin ; When the outlet pressure of the oil pump < the set low pressure threshold ΔP of the oil pressure out then it is judged whether the oil temperature T oin is higher than the set high threshold ΔT of the oil temperature oin The process is as follows: When the engine oil temperature ≥ the set high engine oil temperature threshold ΔT oin , then judge the relationship between the high-temperature water temperature T win and the set high-temperature water temperature threshold ΔT win : When the engine oil temperature < the set high engine oil temperature threshold ΔT oin , then check whether the outlet pressure P of the oil pump out suddenly drops, and judge the cause of the fault.

2. The intelligent diagnosis method for abnormal inlet oil pressure of locomotive diesel engine according to claim 1, characterized in that: When the engine oil temperature < the set high engine oil temperature threshold ΔT oin , then for the engine oil pump outlet pressure P out to determine whether it belongs to a sudden drop situation, the process of judging the cause of the fault is as follows: When the oil pump outlet pressure belongs to a sudden drop situation, judge that the fault causes are: oil dilution, emulsification, or abnormal oil constant pressure valve, and the operation and maintenance suggestion is: when driving, if the oil inlet pressure is higher than the safety threshold, observe the operation, otherwise stop the machine; during maintenance, check the oil level and the state of the oil constant pressure valve in sequence; When the oil pump outlet pressure does not belong to a sudden drop, judge that the fault causes are: abnormal oil level, decreased oil quality, or oil pump failure, and give the operation and maintenance suggestion: when driving, if the oil inlet pressure is higher than the safety threshold, observe the operation, otherwise stop the machine; during maintenance, check the oil level, oil state, and oil pump in sequence; 3. The intelligent diagnosis method for abnormal inlet oil pressure of a locomotive diesel engine according to claim 1, wherein: When the oil pump outlet pressure ≥ the set low pressure threshold ΔP out then, determine whether the oil temperature T oin is higher than the set high oil temperature threshold ΔT oin The process is as follows: When the engine oil temperature ≥ the set high engine oil temperature threshold ΔT oin , then judge the relationship between the high-temperature water temperature T win and the set high-temperature water temperature threshold ΔT win : When the engine oil temperature < the set high engine oil temperature threshold ΔT oin , then check whether the engine oil inlet pressure P in suddenly drops, and judge the cause of the fault.

4. The intelligent diagnosis method for abnormal oil inlet pressure of a locomotive diesel engine according to claim 1, characterized in that: When the engine oil temperature < the set high engine oil temperature threshold ΔT oin , then for the engine oil inlet pressure P in to determine whether it belongs to a sudden drop situation, the process of judging the cause of the fault is as follows; When the oil inlet pressure belongs to a sudden drop situation, judge that the fault causes are: pipeline leakage or abnormal moving pairs, and the operation and maintenance suggestion: when driving, if the oil inlet pressure is higher than the safety threshold, observe the operation, otherwise stop the machine; during maintenance, check the oil level, oil quality, and diesel engine moving parts in sequence; When the oil inlet pressure does not belong to a sudden drop situation, judge that the fault causes are: low oil level, decreased oil quality, or oil filter blockage, and the operation and maintenance suggestion: when driving, if the oil inlet pressure is higher than the safety threshold, observe the operation, otherwise stop the machine; during maintenance, check the oil level, oil quality, the state of the oil filter, and diesel engine moving parts in sequence; 5. The intelligent diagnosis method for abnormal inlet oil pressure of locomotive diesel engine according to claim 1 or 3, characterized in that: When the engine oil temperature ≥ the set high engine oil temperature threshold ΔT oin , then the process of judging the relationship between the high-temperature water temperature T win and the set high-temperature water temperature threshold ΔT win is as follows: When the temperature of the high-temperature water ≥ the high threshold value ΔT of the set high-temperature water temperature win , it is determined that the cause of the failure is: poor heat dissipation of the locomotive cooling water. Maintenance suggestion: Observe the operation during driving, and successively check the components of the cooling system such as the locomotive cooling fan, contactor, cooling water pipeline, shutter, and radiator single section during maintenance; When the temperature of the high-temperature water < the high threshold value ΔT of the set high-temperature water temperature win , the cause of the failure is judged as: the oil heat exchange system is faulty. Maintenance suggestion: Observe the operation during driving, and check the oil heat exchanger and oil pipeline in sequence during maintenance.

6. The intelligent diagnosis method for abnormal inlet oil pressure of locomotive diesel engine according to claim 1, characterized in that: It also includes an alarm prompt for abnormal oil inlet pressure situations.

7. The intelligent diagnosis device for the intelligent diagnosis method of abnormal inlet pressure of locomotive diesel engine oil according to any one of claims 1-6, characterized in that: Including An acquisition module: used to obtain the signal values of the diesel engine oil inlet pressure, diesel engine speed, oil temperature, high-temperature water temperature, and oil pump outlet pressure; Judgment module: used to determine that when the diesel engine oil is at a certain rotational speed, the oil inlet pressure P in <is lower than the low threshold value ΔP of the oil inlet pressure at this rotational speed in and after a certain period of time, it is determined that there is an abnormality in the oil inlet pressure; A fault cause diagnosis module: used to use the method of comparing the oil pump outlet pressure, oil temperature, and high-temperature water temperature with their respective thresholds in sequence to judge the fault causes of the oil pump inlet pressure when the oil inlet pressure is abnormal; An alarm module: used to give an alarm prompt for abnormal oil inlet pressure situations.

8. An intelligent diagnosis system for abnormal inlet pressure of locomotive diesel engine oil, characterized in that: Including a signal acquisition module for collecting the oil inlet pressure, diesel engine oil speed, oil temperature, high-temperature water temperature, and oil pump outlet pressure; Based on the oil inlet pressure, diesel engine oil speed, oil temperature, high-temperature water temperature, and oil pump outlet pressure collected by the signal acquisition module, use the intelligent diagnosis device for abnormal oil inlet pressure of a locomotive diesel engine as described in claim 7 to judge the fault causes of the oil inlet pressure; An on-vehicle operation and maintenance display terminal for displaying the fault causes, operation and maintenance suggestions, and early warning prompts of the intelligent diagnosis device.

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